GB2610649A

GB2610649A - Releasable connector assembly

Info

Publication number: GB2610649A
Application number: GB2113124.8A
Authority: GB
Inventors: Robinson Nigel; Molloy Stephen
Original assignee: Apollo Offshore Engineering Ltd
Current assignee: Apollo Offshore Engineering Ltd
Priority date: 2021-09-14
Filing date: 2021-09-14
Publication date: 2023-03-15
Also published as: WO2023041608A1; EP4402047A1; GB202113124D0

Abstract

A releasable connector assembly 210 comprises a first connector 224 and a second connector 226 releasably connectable within a cavity (237, Fig 18) of the first connector. The first and second connectors include first and second axial load shoulders (266, Fig 18) and (270, Fig 19). One of the first and second connectors includes a guide track (219, Fig 18) and the other of the first and second connectors includes a guide member (276, Fig 19) configured to be received within the guide track. In use, the guide member is guided along the guide track from an entry region to a locking region (258, Fig 18) to configure the first and second connectors in a connected state, and the guide member is guided along the guide track from the locking region to an exit region to configure the first and second connectors in a disconnected state. When the guide member is located at the locking region of the guide track the first and second axial load shoulders are engaged such that axial loading between the first and second connectors is transmitted between the first and second axial load shoulders. A method of use is also disclosed.

Description

RELEASABLE CONNECTOR ASSEMBLY

FIELD

The present disclosure relates to a releasable connector assembly and methods of using a releasable connector assembly.

BACKGROUND

Many processes require quick and reliable connections to be made. Further, it is often required that such connections may be readily releasable too. For example, floating structures in an offshore environment, such as offshore windfarms, wave energy converter (WEC) devices, floating production storage and offloading (FPSO) vessels, etc., often require connection to a mooring system. In this case, it is often desirable to connect the floating structure to the mooring system with minimal effort and time. The use of actuators to enable such connections to be made may provide a quick connection, however these types of connectors can have poor reliability and may require frequent servicing.

SUMMARY

An aspect of the present disclosure relates to a releasable connector assembly comprising: a first connector defining a cavity having a first axial load shoulder; and a second connector releasably connectable within the cavity of the first connector, the second connector including a second axial load shoulder, wherein one of the first and second connectors includes a guide track which defines a track profile having an entry region, a locking region and an exit region, and the other of the first and second connectors includes a guide member configured to be received within the guide track, wherein, in use, the guide member is guided along the guide track from the entry region to the locking region during a first sequence of relative movement between the first and second connectors in reverse axial directions to configure the first and second connectors in a connected state, and the guide member is guided along the guide track from the locking region to the exit region during a subsequent second sequence of relative movement between the first and second connectors in reverse axial directions to configure the first and second connectors in a disconnected state, and wherein when the guide member is located at the locking region of the guide track the first and second axial load shoulders are engaged such that axial loading between the first and second connectors is transmitted between the first and second axial load shoulders.

The connector assembly provides for a simple connection to be made between two components without requiring any actuators for the connection/disconnection to be made. That is, the provision of the guide track and the guide member eliminates the need for any actuators to bring the first and second connectors into a connected state.

Furthermore, the provision of first and second axial load shoulders means that axial loading between the first and second connectors is not transmitted through the guide member and guide track. This may enable greater loads to be transmitted through the connector assembly, while also protecting the guide track and guide member from damage.

In some of the description below the guide track may be presented as being a specific feature of one of the first and second connectors (such as the first connector) and the guide member may be presented as being a specific feature of the other of the first and second connectors (such as the second connector). However, it should be recognised that this is largely for brevity purposes only, and that the first connector may instead include the guide member and that the second connector may instead include the guide track.

The first connector may comprise a first longitudinal axis. The second connector may comprise a second longitudinal axis. When the first and second connectors are arranged together to be or when connected the longitudinal axes may be co-axially aligned with one another.

The first sequence of relative movement between the first and second connectors may comprise relative translation of the first and second connectors along the longitudinal axes, in reverse axial directions. The first connector may move relative to the second connector in a first axial direction and then subsequently in a second axial direction as the guide member is guided along the guide track from the entry region to the locking region. Alternatively, the second connector may move relative to the first connector to provide the relative movement between the first and second connectors in the first and second axial directions. In a further example both connectors may be configured to provide at least a portion of the relative movement therebetween.

A first force may be applied to the first connector while the second connector may be held substantially stationary to provide relative movement between the first and second connectors in the first axial direction. A second (opposite) force may be applied to the first connector while the second connector may be held substantially stationary to provide relative movement between the first and second connectors in the second axial direction. Alternatively, the first and second forces may be applied to the second connector while the first connector may be held substantially stationary. The first and second forces may act in a direction parallel to the longitudinal axes of the first and second connectors. The first and second forces may be defined as first and second axial forces.

The guide track may include a first stop region in which the relative movement between the first and second connectors reverses or is required to be reversed from the first axial direction to the second axial direction. The first sequence of relative movement between the first and second connectors may comprise relative movement in the first axial direction from the entry region to the first stop region, and relative movement in the second axial direction from the first stop region to the locking region.

The first stop region may comprise a first stop member for the guide member to abut at the end of travel in the first axial direction. When the guide member reaches the first stop region, a first mechanical feedback signal may be provided to indicate that relative movement between the first and second connectors in the first axial direction should be reversed to the second axial direction in order to move the guide member to the locking region. The first mechanical feedback signal may provide information on the position of the guide member relative to the guide track, and therefore information on the position of the first connector relative to the second connector. The first mechanical feedback signal may result from engagement of the guide member with the first stop member.

Alternatively, a separate stop member may be provided separately from the guide track. The separate stop member may be spaced from the guide track, for example axially spaced. For example, the separate stop member may be defined by or within the cavity of the first connector. The separate stop member may comprise a stop ring.

The separate stop member may extend inwardly within the cavity. The second connector may be configured to abut the separate stop member when the guide member is located at the first stop region, such that the guide member does not contact an end of the guide track in the first stop region. Providing the stop member separately from the guide track may prevent or reduce axial forces acting on the guide member and guide track.

The first sequence of relative movement between the first and second connectors may comprise relative rotation of the first and second connectors. Such relative rotation may be provided about the longitudinal axes of the first and second connectors. The guide track may be arranged to provide, for example induce, the relative rotation of the first and second connectors as the guide member is guided along the guide track from the entry region to the locking region.

The guide track may comprise first and second opposing guide surfaces extending substantially parallel to one another, which may together define the track profile. The guide member may engage at least one of the guide surfaces as the guide member is guided along the guide track such that a force is imparted on the guide member causing the guide member to change its direction of travel, thereby providing relative rotation between the first and second connectors. The guide track may comprise a helical structure (e.g. a helical channel) which together with the guide member may be configured to provide the relative rotation of the first and second connectors.

The first and second connectors may undergo a first relative rotation as the guide member is guided along the guide track from the entry region to the first stop region.

The first and second connectors may undergo a second relative rotation as the guide member is guided along the guide track from the first stop region to the locking region. The first and second relative rotations may be in the same rotational direction as one another.

The guide track may comprise any number of first stop regions, such as one, two, three, etc. Consequently, the first sequence of relative movement may comprise one or more changes in the first and second reverse axial directions in order to move the guide member from the entry region to the locking region. In this regard, the guide track and guide member may function together as an indexer mechanism.

The second sequence of relative movement between the first and second connectors may comprise relative translation of the first and second connectors along the longitudinal axes, in the first and second reverse axial directions. The first connector may move relative to the second connector in the first axial direction and then subsequently in the second axial direction as the guide member is guided along the guide track from the locking region to the exit region. Alternatively, the second connector may move relative to the first connector to provide the relative movement between the first and second connectors in the first and second axial directions.

A third force may be applied to the first connector while the second connector may be held substantially stationary to provide relative movement between the first and second connectors in the first axial direction. A fourth force may be applied to the first connector while the second connector may be held substantially stationary to provide relative movement between the first and second connectors in the second axial direction. Alternatively, the third and fourth forces may be applied to the second connector while the first connector may be held substantially stationary. The third and fourth forces may act in a direction parallel to the longitudinal axes of the first and second connectors. The third and fourth forces may act in the same direction as the first and second forces, respectively.

In one example, the first and third forces may be provided by gravity. The second and fourth forces may be provided by providing a pulling force on one of the first and second connectors in a direction against gravity, depending on the orientation of the connector assembly. Alternatively, the second and fourth forces may be provided by gravity, and the first and third forces may be provided by providing a pulling force on one of the first and second connectors in a direction against gravity, depending on the orientation of the connector assembly.

The guide track may include a second stop region in which the relative movement between the first and second connectors reverses from the first axial direction to the second axial direction. The second sequence of relative movement between the first and second connectors may comprise relative movement in the first axial direction from the locking region to the second stop region, and relative movement in the second axial direction from the second stop region to the exit region.

The second stop region may comprise a second stop member for the guide member to abut at the end of travel in the first axial direction. When the guide member reaches the second stop region, a second mechanical feedback signal may be provided to indicate that relative movement between the first and second connectors in the first axial direction should be reversed to the second axial direction in order to move the guide member to the exit region. The second mechanical feedback signal may provide information on the position of the guide member relative to the guide track, and therefore information on the position of the first connector relative to the second connector. The second mechanical feedback signal may result from engagement of the guide member with the second stop member.

Alternatively, where a separate stop member is provided as described above, the second connector may be configured to abut the separate stop member when the guide member is located at the second stop region, such that the guide member does not contact an end of the guide track in the second stop region. This may prevent or reduce axial forces acting on the guide member and guide track.

The second sequence of relative movement between the first and second connectors may comprise relative rotation of the first and second connectors about the longitudinal axes of the first and second connectors. The guide track may be configured to provide (e.g., induce) the relative rotation of the first and second connectors as the guide member is guided along the guide track from the locking region to the exit region. The guide member may engage at least one of the guide surfaces as the guide member is guided along the guide track such that a force is imparted on the guide member causing the guide member to change its direction of travel, thereby providing relative rotation between the first and second connectors. The guide track may comprise a helical structure (e.g. a helical channel) configured to provide the relative rotation of the first and second connectors.

The first and second connectors may undergo a third relative rotation as the guide member is guided along the guide track from the locking region to the second stop region. The first and second connectors may undergo a fourth relative rotation as the guide member is guided along the guide track from the second stop region to the exit region. The third and fourth relative rotations may be in the same rotational direction.

The guide track may comprise any number of second stop regions. Consequently, the second sequence may comprise one or more changes in the reverse first and second axial directions in order to move the guide member from the locking region to the exit region. In this regard, the guide track and guide member may function together as an indexer mechanism.

In the connected state, the first and second connectors may be held together under tension. Accordingly, the connector assembly may provide a number of advantages for a wide range of applications. For example, the connector assembly may be used in a mooring environment, to provide a mooring connection (e.g. a subsea mooring connection) for a floating structure (e.g. an offshore windfarm, a wave energy converter (VVEC) device, a floating production storage and offloading (FPSO) vessel, etc.). In this regard, one of the first and second connectors may be integrated into a subsea structure, such as a pile structure in the seabed. The other of the first and second connectors may be attached to an end (e.g. a lower end) of a tether or mooring line attached to the floating structure. The first and second connectors may be engaged, for example the second connector may be lowered into the first connector, under the action of gravity. In this regard, one of the first and second connectors may be designed to have a weight sufficient to overcome any buoyancy forces during subsea deployment.

Alternatively or additionally, the connector assembly may be used to provide a surface mooring connection. In this example, one of the first and second connectors may be attached to a floating structure. The other of the first and second connectors may be attached to an upper end of a mooring line. The first and second connectors may be engaged by pulling one towards the other, for example by operating a winch on the floating structure, to configure the first and second connectors in the connected state.

In other examples, the connector assembly may be used as a general lifting device. In this regard, one of the first and second connectors may be integrated or attached to a payload to be lifted. The other of the first and second connectors may be manipulated (e.g. lowered under the action of gravity and control of a lifting winch, crane etc.) to provide connection, following which the payload may be lifted.

The first connector may be defined as a receptacle. The second connector may be defined as a plug.

The first connector may comprise a receiving end, an intermediate portion and a base end. The receiving end may be an open end. The receiving end may be configured to receive the second connector. The receiving end may comprise a shape configured to funnel the second connector towards the intermediate section of the first connector. The receiving end may comprise a funnel shape. The receiving end may comprise a frustoconical shape.

The intermediate portion may comprise a cylindrical shape. The intermediate portion may comprise a sleeve. The sleeve may be defined as a housing. The intermediate portion may be a continuous structure. Alternatively, the intermediate portion may comprise two or more segments. The two or more segments may comprise a curved profile. The two or more segments, when connected together, may form a cylindrical shape. The two or more segments, when connected together, may form at least part of the sleeve of the first connector. The two or more segments may be connected together via one or more connecting members. The connecting members may comprise one or more ribs, e.g. axial ribs. The axial ribs may extend from the receiving end to the base end of the first connector. The connecting members may provide structural support to the first connector, as well as to the connector assembly when in the connected state.

The first connector may comprise one or more stiffening members. The intermediate portion may comprise one or more stiffening members. The stiffening members may comprise stiffening disks. The stiffening members may be connected to the axial ribs. The stiffening members may be connected to the two or more segments of the intermediate portion.

The base end may comprise a fastening mechanism for connecting the first connector to a structure, such as a floating platform at sea level, an object (e.g. a pile structure) at the seabed or to an object requiring lifting, etc. The fastening mechanism may be configured to permit the first connector to rotate relative to the structure to which it is attached. The fastening mechanism may comprise a clevis or gimbal arrangement.

Allowing the first connector to rotate relative to the object to which it is attached may reduce stresses acting on the connector assembly. Alternatively, the fastening mechanism may be configured to rotationally fix the first connector to the structure. The fastening mechanism may comprise a flange connection. The flange connection may permit the first connector to be bolted or otherwise secured to the structure, such as a pile structure in the seabed or a floating structure (e.g. an underside of a floating structure).

The base end may comprise an aperture. The aperture may permit a line or rope connected to the second connector to be placed therethrough such that the second connector can be pulled into the first connector. The line or rope may permit a pulling force to be applied to the second connector. The pulling force on the second connector may provide the relative translation of the first and second connectors.

The guide track may be located at the intermediate portion. The guide track may extend at least partly around a circumference of the intermediate portion. The guide track may comprise a slot formed in the intermediate portion. The two or more segments of the intermediate portion may be dimensioned and arranged such that the guide member is received and guided in a space defined between the two or more segments. Alternatively, the guide track may be defined by a separate guiding structure placed inside the intermediate section. The separate guiding structure may be secured in place inside the intermediate section.

The guide track may comprise one or more helical channels configured to guide the guide member between the entry region, the locking region and the exit region. The one or more helical channels may be arranged at an angle with respect to the longitudinal axis of the first connector. The one or more helical channels may be oblique to the longitudinal axis of the first connector. The one or more helical channels may cause the guide member to change its direction of travel as the guide member is guided along the guide track. The one or more helical channels may provide the relative rotation between the first and second connectors.

The guide track may comprise a first helical channel configured to guide the guide member towards the first stop region. The guide member may be guided along the first helical channel as the first and second connectors translate relative to one another in the first axial direction. The guide track may comprise a second helical channel configured to guide the guide member towards the locking region. The guide member may be guided along the second helical channel as the first and second connectors translate relative to one another in the second axial direction.

The guide track may comprise a third helical channel configured to guide the guide member towards the second stop region. The guide member may be guided along the third helical channel as the first and second connectors translate relative to one another in the first axial direction. The guide track may comprise a fourth helical channel configured to guide the guide member towards the exit region. The guide member may be guided along the fourth helical channel as the first and second connectors translate relative to one another in the second axial direction.

The entry region of the guide track may be located towards the receiving end of the first connector. The entry region may comprise an enlarged opening. The enlarged opening may taper or converge in a direction towards the base end of the first connector. The enlarged opening may provide a larger area for the guiding member to enter the guide track.

The enlarged opening may connect to an entrance channel of the guide track. The entrance channel may extend parallel to the longitudinal axis of the first connector.

The entrance channel may be at least partly straight. The entrance channel may be narrower in width than the enlarged opening. The one or more helical channels may comprise a width corresponding to that of the entrance channel.

The fourth helical channel may be connected to an exit channel. The exit channel may extend parallel to the longitudinal axis of the first connector. The exit channel may be at least partly straight. The exit channel may comprise a width corresponding to that of the entrance channel and the one or more helical channels. The exit region may comprise an enlarged exit. The enlarged exit may diverge in a direction towards the receiving end of the first connector.

The first connector may define any number of guide tracks, e.g. one, two, three or more guide tracks. The one or more guide tracks may be located around a circumference of the first connector. The one or more guide tracks may be evenly spaced around the circumference of the first connector. Where the first connector comprises two or more guide tracks, an exit region of a first track may define an entry region of a second track. Further, an exit region of the second track may define an entry region of a third track, and so on.

The guide member may extend (e.g. radially extend) from the longitudinal axis of the second connector. The guide member may extend (e.g. radially extend) from a body of the second connector. A dimension of the guide member may be determined in accordance with a dimension of the guide track of the first connector. For example, a length of the guide member may be determined in accordance with a depth of the guide track. The guide member may comprise a protrusion. The guide member may comprise a pin. The guide member may comprise a key.

The second connector may comprise any number of guide members. The second connector may comprise a number of guide members corresponding to the number of guide tracks of the first connector. Where there are provided two or more guide members and two or more guide tracks, the guide members of the second connector may be located at a suitable position to cooperate with a respective guide track of the first connector.

The second connector may be sized in accordance with a dimension of the cavity of the first connector. The second connector may comprise a cylindrical structure. The second connector may be hollow. The second connector may be solid, i.e. non-hollow. An outer surface of the second connector may be fully continuous, i.e. there may be no opening into or through the second connector.

The second connector may comprise a leading end and a trailing end. When the second connector is to be received in the first connector, the second connector may be oriented relative to the first connector such that the leading end faces the first connector. The leading end may be configured to enter the cavity of the first connector before the trailing end.

The leading end may comprise a curved profile. The leading end may comprise a round profile. The leading end may comprise a cone profile. The profile of the leading end may assist with entry of the second connector into the first connector. The leading end may be provided with a material suitable to dampen and/or absorb impact forces associated with the second connector entering the cavity of the first connector.

The leading end may be provided with a first attachment mechanism for connecting the second connector to an object. The first attachment mechanism may permit a force to be transmitted and applied to the second connector in order to provide the relative movement between the first and second connectors. The first attachment mechanism may comprise a structure permitting an object to be engaged therewith. For example, the first attachment mechanism may comprise a hook structure. The first attachment mechanism may comprise an opening. The opening may be configured to receive a hook, a rope, etc. The first attachment mechanism may be configured to permit the second connector to rotate relative to the object to which it is attached. For example, the object which the first connector is attached to may comprise an end of a mooring line or a line connected to a floating structure. The first attachment mechanism may comprise a clevis or gimbal arrangement. This may be particularly advantageous where the connector assembly is used in a mooring environment, since the floating structure which is moored may move relative to the seabed when the connector assembly is in the connected state. Therefore, allowing the second connector to rotate relative to the object to which it is attached may reduce stresses acting on the connector assembly.

The trailing end may be provided with a second attachment mechanism for connecting the second connector to an object. The second attachment mechanism may comprise a structure permitting an object to be engaged therewith. For example, the second attachment mechanism may comprise a hook structure. The second attachment mechanism may comprise an opening. The opening may be configured to receive a hook, a rope, etc. The second attachment mechanism may be configured to permit the second connector to rotate relative to the object to which it is attached. For example, the object which the second connector is attached to may comprise an upper end of a mooring line. The second attachment mechanism may comprise a clevis or gimbal arrangement.

The leading end may comprise a detachable cone element removable from the second connector (e.g. removable from a body of the second connector). The detachable cone element may permit access to the body, for example to locate a weighted material therein. The weighted material may provide sufficient weight so that the second connector may fall to the bottom of the seabed under the action of gravity against buoyancy forces The first connector may comprise a first projection. The first axial load shoulder may be provided by the first projection. The first projection may extend inwardly (e.g. radially inwardly) from the sleeve of the first connector. The first projection may protrude (e.g. radially protrude) into the cavity of the first connector. The first axial load shoulder may comprise a surface extending perpendicular to the longitudinal axis of the first connector. Alternatively, the first axial load shoulder may comprise a slanted surface with respect to the longitudinal axis of the first connector.

The second connector may comprise a second projection. The second axial load shoulder may be provided by the second projection. The second projection may extend (e.g. radially extend) from the body of the second connector. The second axial load shoulder may comprise a surface perpendicular to the longitudinal axis of the second connector. Alternatively, the second axial load shoulder may comprise a slanted surface. The slanted surface of the second axial load shoulder may comprise an angle corresponding to that of the slanted surface of the first axial load shoulder.

The first and second axial load shoulders may be co-axially aligned with one another when the guide member is located at the locking region of the guide track.

The relative axial position of the first and second axial load shoulders may be such that the first and second axial load shoulders engage one another before the guide member reaches an end of the guide track in the locking region. As such, the guide member may be prevented from contacting an end of the guide track in the locking region. This may protect the guide track and guide member from damage, while enabling greater loads to be transmitted between the first and second connectors.

The relative circumferential position of the first and second axial load shoulders may be such that the first and second axial load shoulders are axially misaligned when the guide member is located at the entry region of the guide track. The relative circumferential position of the first and second axial load shoulders may be such that the first and second load shoulders are axially aligned when the guide member is located at the locking region of the guide track. The relative circumferential position of the first and second axial load shoulders may be such that the first and second load shoulders are axially unaligned when the guide member is located at the exit region of the guide track. This may enable the first and second axial load shoulders to pass by one another as the guide member enters the entry region of the guide track and exits the exit region of the guide track.

The guide member may be axially aligned with the second axial load shoulder. The locking region of the guide track may be axially aligned with the first axial load shoulder.

The guide member may be provided on the second projection. In an example, the guide member may extend from a surface (e.g. a side surface) of the second projection. Alternatively, the guide member may be provided on the second connector separately from the second projection. The guide member may be spaced (e.g. axially spaced) from the first axial load shoulder.

The first connector may comprise a first tapered surface. The second connector may comprise a second tapered surface. The first projection may comprise the first tapered surface, e.g. on a side opposite to the first axial load shoulder. Further, the second projection may comprise the second tapered surface, e.g. on a side opposite to the second axial load shoulder. The first and second tapered surfaces may be configured to engage each other as the second connector enters the cavity of the first connector, i.e. as the first and second connectors translate relative to one another in the first axial direction. This may result in relative rotation between the first and second connectors such that the guide member is brought into alignment with the entry region of the guide track. In particular, the guide member may be brought into alignment with the enlarged portion of the guide track.

The first connector may comprise any number of first axial load shoulders, e.g. one, two, three or more first axial load shoulders. The second connector may comprise any number of second axial load shoulders, e.g. one, two, three or more second axial load shoulders. The number of first load shoulders may correspond to the number of second load shoulders. Where there are provided two or more of each of the first and second axial load shoulders, the relative position of the first and second axial load shoulders may be such that each of the first load shoulders engages a respective second load shoulder, i.e. a first load shoulder may be axially co-aligned with a respective second load shoulder when the guide member is located at the locking region of the guide track. The two or more of each of the first and second axial load shoulders may be located around a circumference of the first and second connectors, respectively, e.g. evenly spaced around the circumference of the first and second connectors, respectively.

Where the first connector comprises two or more guide tracks and two or more first axial load shoulders, each of the first axial load shoulders may be circumferentially interposed between entry regions and exit regions of the guide tracks.

The connector assembly may be configured to transmit a signal through the connector assembly. The signal may comprise an electromagnetic signal. The electromagnetic signal may comprise one or more of an electrical signal, a power signal, an optical signal, a communication signal, etc. The connector assembly may be configured to permit an electromagnetic connection to be made between the first and second connectors. The electromagnetic connection may comprise an electrical connection, a power connection, an optical connection, a communication connection, etc. The first connector may be provided with a first electromagnetic connecting member.

The second connector may be provided with a second electromagnetic connecting member. The first and/or second electromagnetic connecting members may comprise one or more of first and second electrical connecting members, first and second power connecting members, first and second optical connecting members, first and second communication connecting members, etc. For example, the first electromagnetic connecting member may comprise an electrode and the second electromagnetic connecting member may comprise a socket, or vice versa. The first and second electromagnetic connecting members may be arranged such that when the guide member is located in the locking region of the guide track an electromagnetic connection is established between the first and second connecters. This may permit electromagnetic signals to be transmitted through the connector assembly.

The relative positon of the first axial load shoulder and the first electromagnetic connecting member, and the second axial load shoulder and the second electromagnetic connecting member, may be such that the electromagnetic connection is established at the same time as the first and second load shoulders engage one another. This may reduce stresses acting on the first and second electromagnetic connecting members by virtue of the first and second load shoulders being engaged when the electrical connection is established.

The first and second electromagnetic connecting members may provide an electromagnetic connection suitable for use in wet environments, such as under water or subsea. The first and second electromagnetic connecting members may comprise a wet-mate connection. The wet-mate connection may enable a safe and reliable electrical connection to be established when the connector assembly is used in a wet environment, for example in a mooring environment.

The first electromagnetic connecting member may be provided on a first electromagnetic shoulder (e.g. an axially facing surface of the first electromagnetic shoulder). The first electromagnetic shoulder may be located closer to the base end of the first section than the first axial load shoulder. The first electromagnetic shoulder may extend inwardly (e.g. radially inwardly) from the sleeve of the first connector.

The second electromagnetic connecting member may be provided on a second electromagnetic shoulder (e.g. an axially facing surface of the second electrical shoulder). The second electromagnetic shoulder may extend radially (e.g. radially outwardly) from the body of the second connector. The first and second electromagnetic shoulders may be axially aligned when the guide member is located in the locking region of the guide track, such that an electromagnetic connection is made between the first and second electromagnetic connecting members. The guide member may be axially aligned with the second electromagnetic shoulder. The guide member may be provided on the second electromagnetic shoulder. The guide member may extend from a surface (e.g. a side surface) of the second electromagnetic shoulder.

The second electromagnetic shoulder may be located closer to the leading end of the second connector than the second axial load shoulder. The second electromagnetic shoulder may enter the cavity of the first connector before the second axial load shoulder. As such, the second electromagnetic shoulder may comprise the second tapered surface. The second tapered surface may be provided on a side of the electromagnetic shoulder opposite to the second electromagnetic connecting member. As noted above, the second tapered surface may engage the first tapered surface of the first projection as the second connector enters the cavity of the first connector. This may result in relative rotation between the first and second connectors such that the guide member is brought into alignment with the entry region of the guide track.

The connector assembly may comprise a torque limiter. The torque limiter may be configured to rotationally lock the first and second connectors relative to one another. The torque limiter may reduce or prevent rotational forces acting on the first and second electromagnetic connecting members. The torque limiter may prevent or reduce rotational forces acting on the guide member and the guide track. The first connector may be provided with a first torque limiting structure. The second connector may be provided with a second torque limiting structure. The first and second torque limiting structures may be configured to engage one another when the guide member is located in the locking position of the guide track. The first and second torque limiting structures may together be defined as a torque limiter.

The first projection may comprise the first torque limiting structure. The first axial load shoulder may comprise the first torque limiting structure. The second projection may comprise the second torque limiting structure. The second axial load shoulder may comprise the second torque limiting structure. The first and second torque limiting structures may be engaged with one another when the first and second axial load shoulders are engaged with one another. In some examples, the first torque limiting structure may comprise a recess. The second torque limiting structure may comprise a protrusion. The protrusion may be configured to be received in the recess when the guide member is located in the locking position of the guide track. The protrusion may comprise a dimension corresponding to a dimension of the recess such that the protrusion is rotationally fixed with respect to the recess when received therein, i.e. the protrusion and recess may provide a tight fit.

The connector assembly disclosed herein, or at least some components of the connector assembly, may be manufactured in any suitable manner, such as using conventional manufacturing process. Accordingly, examples described herein not only include the connector assembly and associated components, but also methods of manufacturing the connector assembly or associated components via conventional manufacturing processes.

In some examples, the connector assembly may be formed of, or coated with, a material suitable for use in wet environments. For example, such a material may provide resistance against corrosion, etc. In some examples, the connector assembly, or any individual component or groups of components may be manufactured by additive manufacturing. Such described additive manufacturing typically involves processes in which components are fabricated based on three-dimensional (3D) information, for example a three-dimensional computer model (or design file), of the component.

Accordingly, examples described herein not only include the connector assembly and associated components, but also methods of manufacturing the connector assembly or associated components via additive manufacturing and computer software, firmware or hardware for controlling the manufacture of the connector assembly and associated components via additive manufacturing. All future reference to "product" are understood to include the described connector assembly and all associated components.

The structure of the connector assembly may be represented digitally in the form of a design file. A design file, or computer aided design (CAD) file, is a configuration file that encodes one or more of the surface or volumetric configuration of the shape of the product. That is, a design file represents the geometrical arrangement or shape of the product.

In light of the above, the present disclosure includes methods of manufacture, such as via additive manufacturing. This includes the steps of obtaining a design file representing the product and instructing an additive manufacturing apparatus to manufacture the product in assembled or unassembled form according to the design file. The additive manufacturing apparatus may include a processor that is configured to automatically convert the design file into computer executable instructions for controlling the manufacture of the product. In these embodiments, the design file itself may automatically cause the production of the product once input into the additive manufacturing device. Accordingly, in this embodiment, the design file itself may be considered computer executable instructions that cause the additive manufacturing apparatus to manufacture the product. Alternatively, the design file may be converted into instructions by an external computing system, with the resulting computer executable instructions being provided to the additive manufacturing device.

Although additive manufacturing technology is described herein as enabling fabrication of complex objects by building objects point-by-point, layer-by-layer, typically in a vertical direction, other methods of fabrication are possible and within the scope of the present subject matter. For example, although the discussion herein refers to the addition of material to form successive layers, one skilled in the art will appreciate that the methods and structures disclosed herein may be practiced with any additive manufacturing technique or other manufacturing technology.

It will be appreciated that features described in relation to one aspect may be equally combined with any other aspect described herein.

An aspect of the present disclosure relates to a method of forming a releasable connection, comprising: providing a first connector defining a cavity having a first axial load shoulder; receiving a second connector in the cavity of the first connector, the second connector including a second axial load shoulder; wherein one of the first and second connectors includes a guide track which defines a track profile having an entry region, a locking region and an exit region, and the other of the first and second connectors includes a guide member configured to be received within the guide track, receiving the guide member in the entry region of the guide track; guiding the guide member along the guide track from the entry region to the locking region during a first sequence of relative movement between the first and second connectors in first and second axial directions to configure the first and second connectors in a connected state, engaging the first and second load shoulders as the first and second connectors are configured in the connected state such that axial loading between the first and second connectors is transmitted between the first and second axial load shoulders; and guiding the guide member along the guide track from the locking region to the exit region during a second sequence of relative movement between the first and second connectors in first and second axial directions to configure the first and second connectors in a disconnected state.

The method may comprise translating the first connector and the second connector relative to one another. The method may comprise rotating the first connector and the second connector relative to one another.

The method may comprise applying a first force (e.g. an axial force) to the first connector while the second connector may be held substantially stationary to provide relative movement between the first and second connectors in the first axial direction. The method may comprise applying a second force (e.g. an axial force, opposite to the first force) while the second connector may be substantially stationary to provide relative movement between the first and second connectors in the second axial direction. Alternatively, the method may comprise applying the first and second forces to the second connector while the first connector may be held substantially stationary.

The method may comprise moving both the first and second connectors to provide at least a portion of the relative movement therebetween.

The first sequence of relative movement between the first and second connectors may comprise guiding the guide member from the entry region to a first stop region. The first sequence of relative movement may comprise subsequently guiding the guide member from the first stop region to the locking region.

The second sequence of relative movement between the first and second connectors may comprise guiding the guide member from the locking region to a second stop region. The second sequence may comprise guiding the guide member from the second stop region to the exit region.

The method may comprise abutting the second connector against a stop member of the first connector when the guide member is located in the first and/or second stop regions.

The method may comprise connecting the first connector to a structure via a fastening mechanism (which may belong to a base end of the first connector). The structure may for example be a floating platform at sea level, an object (e.g. a pile structure) at the seabed or an object requiring lifting, etc. The method may comprise allowing the first connector to rotate relative to the object to which it is attached. The method may comprise rotationally fixing (e.g. bolting) the first connector to the object.

The method may comprise pulling a line or rope through an aperture in the base end of the first connector, wherein the line or rope is connected to a leading end of the second connector.

The method may comprise connecting an object to a trailing end of the second connector. For example, the object may be an upper end of a mooring line or a lower end of a tether. The tether may be configured to communicate an electromagnetic signal to/from the connector assembly.

The method may comprise guiding the guide member through one or more helical channels of the guide track to cause the guide member to change its direction of travel and cause relative rotation between the first and second connectors.

The method may comprise guiding the guide member along a first helical channel as the guide member travels towards the first stop region. The method may comprise guiding the guide member along a second helical channel as the guide member travels towards the locking region. The method may comprise guiding the guide member along a third helical channel as the guide member travels towards the second stop region. The method may comprise guiding the guide member along a fourth helical channel as the guide member travels towards the exit region.

The method may comprise translating the first and second connectors relative to each other in a first axial direction as the guide member travels towards the first stop region.

The method may comprise subsequently translating the first and second connectors relative to each other in a second axial direction as the guide member travels towards the locking region.

The method may comprise translating the first and second connectors relative to each other in the first axial direction as the guide member travels towards the second stop region. The method may comprise subsequently translating the first and second connectors relative to each other in the second axial direction as the guide member travels towards the exit region.

The method may comprise receiving the guide member in an enlarged opening of the entry region of the guide track. The method may comprise guiding the guide member along an entrance channel of the guide track. The method may comprise guiding the guide member along an exit channel of the guide track.

The method may comprise receiving multiple guide members in multiple guide tracks, respectively.

The method may comprise, prior to receiving the second connector in the cavity of the first connector, orientating the first connector relative to the second connector such that the leading end of the second connector faces the first connector.

The method may comprise rotating the first and second connectors relative one another such that the first and second axial load shoulders are brought into axial alignment with one another.

The first connector may comprise a first projection. The first axial load shoulder may be provided by the first projection. The second connector may comprise a second projection. The second axial load shoulder may be provided by the second projection.

The method may comprise engaging first and second tapered surfaces, of the first and second projections, respectively, as the second connector enters the cavity of the first connector, such that the guide member is brought into alignment with the entry region of the guide track.

The method may comprise engaging multiple first and second load shoulders with one another, respectively.

The method may comprise establishing an electromagnetic connection between first and second electromagnetic connecting members of the first and second connectors, respectively. The method may comprise transmitting an electromagnetic signal through the connector assembly. The method may comprise establishing an electromagnetic connection for use in wet environments, such as a wet-mate connection.

The method may comprise establishing the electromagnetic connection at the same time as the first and second load shoulders engage one another.

The second tapered surface may be provided by a second electromagnetic shoulder.

The method may comprise engaging the tapered surface of the first axial load shoulder with the second tapered surface of the second electromagnetic shoulder, as the second connector enters the cavity of the first connector, such that the guide member is brought into alignment with the entry region of the guide track.

The method may comprise operating a torque limiter. The method may comprise engaging first and second torque limiting structures, belonging to the first and second connectors, respectively, when the guide member is located in the locking position of the guide track.

The method may comprise engaging the first and second torque limiting structures at the same time as the first and second load shoulders engage one another. The method may comprise engaging the first and second torque limiting structures at the same time as establishing the electromagnetic connection. The method may comprise engaging the first and second axial load shoulders at the same time as establishing the electromagnetic connection.

An aspect of the present disclosure relates to a method of forming a releasable mooring connection, comprising: providing a first connector defining a cavity having a first axial load shoulder, providing a second connector including a second axial load shoulder; wherein one of the first and second connectors includes a guide track which defines a track profile having an entry region, a locking region and an exit region, and the other of the first and second connectors includes a guide member configured to be received within the guide track, connecting a base end of the first connector to a floating structure; connecting a trailing end of a second connector to a mooring line; connecting a leading end of the second connector to a tether for applying a pulling force to the second connector applying a pulling force to the second connector such that the second connector is received in the cavity of the first connector; receiving the guide member in the entry region of the guide track; guiding the guide member along the guide track from the entry region to the locking region during a first sequence of relative movement between the first and second connectors in first and second axial directions to configure the first and second connectors in a connected state, engaging the first and second load shoulders as the first and second connectors are configured in the connected state such that axial loading between the first and second connectors is transmitted between the first and second axial load shoulders; and guiding the guide member along the guide track from the locking region to the exit region during a second sequence of relative movement between the first and second connectors in first and second axial directions to configure the first and second connectors in a disconnected state.

An aspect of the present disclosure relates to a method of forming a releasable subsea mooring connection, comprising: providing a first connector defining a cavity having a first axial load shoulder; providing a second connector including a second axial load shoulder; wherein one of the first and second connectors includes a guide track which defines a track profile having an entry region, a locking region and an exit region, and the other of the first and second connectors includes a guide member configured to be received within the guide track, connecting a base end of the first connector to the seabed connecting a trailing end of a second connector to a tether for controlling movement of the second connector; lowering the second connector towards the first connector such that the second connector is received in the cavity of the first connector; receiving the guide member in the entry region of the guide track; guiding the guide member along the guide track from the entry region to the locking region during a first sequence of relative movement between the first and second connectors in first and second axial directions to configure the first and second connectors in a connected state, engaging the first and second load shoulders as the first and second connectors are configured in the connected state such that axial loading between the first and second connectors is transmitted between the first and second axial load shoulders; and guiding the guide member along the guide track from the locking region to the exit region during a second sequence of relative movement between the first and second connectors in first and second axial directions to configure the first and second connectors in a disconnected state.

An aspect of the present disclosure relates to a method of forming a releasable connection for lifting an object, comprising providing a first connector defining a cavity having a first axial load shoulder, providing a second connector including a second axial load shoulder; wherein one of the first and second connectors includes a guide track which defines a track profile having an entry region, a locking region and an exit region, and the other of the first and second connectors includes a guide member configured to be received within the guide track, connecting a base end of the first connector to an object to be lifted; connecting a trailing end of a second connector to a tether for controlling movement of the second connector; lowering the second connector towards the first connector such that the second connector is received in the cavity of the first connector; receiving the guide member in the entry region of the guide track; guiding the guide member along the guide track from the entry region to the locking region during a first sequence of relative movement between the first and second connectors in first and second axial directions to configure the first and second connectors in a connected state, engaging the first and second load shoulders as the first and second connectors are configured in the connected state such that axial loading between the first and second connectors is transmitted between the first and second axial load shoulders; and guiding the guide member along the guide track from the locking region to the exit region during a second sequence of relative movement between the first and second connectors in first and second axial directions to configure the first and second connectors in a disconnected state.

An aspect of the present disclosure relates to a releasable mooring connector assembly, comprising: a first connector defining a cavity having a first axial load shoulder; and a second connector releasably connectable within the cavity of the first connector, the second connector including a second axial load shoulder, wherein one of the first and second connectors includes a guide track which defines a track profile having an entry region, a locking region and an exit region, and the other of the first and second connectors includes a guide member configured to be received within the guide track, wherein, in use, the guide member is guided along the guide track from the entry region to the locking region during a first sequence of relative movement between the first and second connectors in reverse axial directions to configure the first and second connectors in a connected state, and the guide member is guided along the guide track from the locking region to the exit region during a subsequent second sequence of relative movement between the first and second connectors in reverse axial directions to configure the first and second connectors in a disconnected state, and wherein when the guide member is located at the locking region of the guide track the first and second axial load shoulders are engaged such that axial loading between the first and second connectors is transmitted between the first and second axial load shoulders.

An aspect of the present disclosure relates to a releasable electromagnetic connector assembly comprising: a first connector defining a cavity and having a first electromagnetic connecting member; and a second connector releasably connectable within the cavity of the first connector, the second connector including a second electromagnetic connecting member, wherein one of the first and second connectors includes a guide track which defines a track profile having an entry region, a locking region and an exit region, and the other of the first and second connectors includes a guide member configured to be received within the guide track, wherein, in use, the guide member is guided along the guide track from the entry region to the locking region during a first sequence of relative movement between the first and second connectors in reverse axial directions to configure the first and second connectors in a connected state, and the guide member is guided along the guide track from the locking region to the exit region during a subsequent second sequence of relative movement between the first and second connectors in reverse axial directions to configure the first and second connectors in a disconnected state, and wherein when the guide member is located at the locking region of the guide track the first and second electromagnetic connecting members are engaged such that an electromagnetic connection is established between the first and second connectors.

The first connector may comprise a first axial load shoulder. The cavity of the first connector may define the first axial load shoulder. The second connector may comprise a second axial load shoulder. When the guide member is located at the locking region of the guide track the first and second axial load shoulders may be engaged such that axial loading between the first and second connectors is transmitted between the first and second axial load shoulders.

BRIEF DESCRIPTION OF DRAWINGS

These and other aspects of the present disclosure will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 is a diagrammatic illustration of a floating structure connected to a mooring system via a connector assembly; Figure 2 is a diagrammatic illustration of the connector assembly including a first connector and a second connector, wherein the second connector is pulled into the first connector; Figure 3 is a perspective view of the first connector of the assembly; Figure 4 is a sectional plan view of the first connector of the assembly; Figure 5 is a perspective view of the second connector of the assembly; Figure 6 is a bottom view of the first connector of the assembly; Figure 7 is a top view of the second connector of the assembly; Figure 8 is a plan view of a guide track and a guide member of the first connector and the second connector, respectively; Figure 9 is a diagrammatic illustration of a floating structure connected to a mooring system via an alternative connector assembly; Figure 10 is a diagrammatic illustration of the alternative connector assembly including a first connector and a second connector, wherein the second connector is lowered into the first connector; Figure 11 is a perspective view of the first connector of the alternative assembly; Figure 12 is a sectional plan view of the first connector of the alternative assembly; Figure 13 is a plan view of the second connector of the alternative assembly; Figure 14 is a plan view of the second connector of the alternative assembly having a detachable cone element removed; Figure 15 is a sectional plan view of the first connector and the second connector of the alternative assembly in a connected state; Figure 16 is a perspective view of a further alternative connector assembly; Figure 17 is an exploded perspective view of a first connector of the further alternative assembly; Figure 18 is a sectional perspective view of a first connector of the further alternative assembly; Figure 19 is a perspective view of a second connector of the further alternative assembly; and Figure 20 is a sectional plan view of the first and second connectors of the further alternative assembly in a connected state.

DETAILED DESCRIPTION

Aspects of the present disclosure relate to apparatus and methods for forming a releasable connection. Multiple applications may be possible and may facilitate connection between two components for any purpose, such as in mooring applications, lifting applications and/or the like. However, for the purposes of providing an exemplary application, the following description relates to forming a mooring connection for a floating structure.

Figure 1 illustrates a releasable connector assembly 10 in a connected state with a mooring line connected to a floating structure 12 located at the sea level 14. The floating structure 12 may be an offshore windfarm, a wave energy converter (WEC) device, a floating production storage and offloading (FPSO) vessel, or any other type of floating structure. The connector assembly 10 is connected at an upper end to the floating structure 12 via a tether 16, and is connected at a lower end to a mooring line 18. The mooring line 18 is connected to a pile structure 20 fixed to the seabed 22.

While Figure 1 illustrates two connector assemblies 10 connecting two mooring lines 18 to the floating structure 12, in practice any number of connector assembles 10 and mooring lines 18 may be provided to moor the floating structure 12 to the seabed 22.

Referring to Figure 2, the releasable connector assembly 10 includes a first connector 24 and a second connector 26. The first connector 24 defines a cavity 37 configured to receive the second connector 26 therein. The second connector 26 is connected at an upper end to the tether 16, which extends through the cavity 37 of the first connector 24 into operable engagement with a winch 28 on the floating structure 12. The winch 28 may be operated to provide a pulling force on the second connector 26 so that the second connector 26 moves in the direction of arrowhead 30 to be received in the cavity 37 of the first connector 24. The first connector 24 may be fixed with respect to the floating structure 12 via an attachment structure 32.

Referring to Figures 3 and 4, the first connector 24 has a longitudinal axis 21. The first connector 24 includes a receiving end 34, an intermediate portion 36 and a base end 38. The receiving end 34 includes an opening configured to receive the second connector 26. The receiving end 34 comprises a frustoconical shape 40 configured to funnel the second connector 24 towards the intermediate section 36 as the second connector 26 enters the cavity 37 of the first connector 24.

The base end 38 includes a fastening mechanism, such as a clevis arrangement 50, for connecting the first connector 24 to a structure, such as the floating platform 12 via attachment structure 32. The base end 38 also includes an aperture 52 permitting the tether 16 to extend through the first connector 24.

The cavity 37 has a guide track 19 which defines a track profile having an entry region 56, a locking region 58 and an exit region 60. The track profile further defines first and second stop regions 62, 64, which are discussed in more detail below. The guide track 19 may extend at least partly around a circumference of the intermediate portion 36.

The first connector 24 includes a first (slanted) axial load shoulder 68 provided by a first projection 66. The first projection 66 includes on one side the axial load shoulder 68 and a first tapered surface 69 on another, opposite side. The first connector 24 may include any number of guide tracks 19 and axial load shoulders 68. However, in this example the first connector 24 includes three guide tracks 19 and three axial load shoulders 68.

The intermediate portion 36 comprises two or more segments 42. The segments 42 include a curved profile such that when the segments 42 are connected together they form a cylindrical sleeve 44. The segments 42 are connected together via one or more connecting members, such as axial ribs 46, extending from the receiving end 34 to the base end 38. The segments 42 of the intermediate portion 36 are dimensioned and arranged such that the guide track 19 is defined by a space between the segments 42.

Referring to Figure 5, the second connector 26 has a longitudinal axis 23. When the first and second connectors 24, 26 are in a connected state, the longitudinal axes 21, 23 of the first and second connectors 24, 26 are co-axially aligned with one another. The second connector 26 includes a second (slanted) axial load shoulder 72 provided by a second projection 70. The second projection 70 includes on one side the axial load shoulder 72 and a second tapered surface 74 on another, opposite side. A guide member 76 is provided on the second projection 70 and is configured to be received in the guide track 19 of the first connector 24. The first and second tapered surfaces 69, 74 are configured to engage each other as the second connector 26 enters the cavity 37 of the first connector 24. This results in relative rotation between the first and second connectors 24, 26 such that the guide member 76 is brought into alignment with the entry region 56 of the guide track 19. The second connector 26 may include any number of guide members 70 and axial load shoulders 70. However, in this example the second connector 26 includes three guide members 76 and three axial load shoulders 72, to correspond to the number of guide tracks 19 and axial load shoulders 68 of the first connector 24.

The second connector 26 comprises a leading end 80 and a trailing end 82. Wien the second connector 26 is to be received in the first connector 24, the second connector 26 is oriented relative to the first connector 24 such that the leading end 80 faces the first connector 24. The leading end comprises a round profile 84, which may assist with entry of the second connector 26 into the first connector 24.

The leading end 80 is provided with a first attachment mechanism 86 for connecting the second connector 26 to an object, such as the tether 16. The trailing end 88 is provided with a second attachment mechanism 88 for connecting the second connector 26 to another object, such as the mooring line 18.

Referring to Figures 6, 7 and 8, the entry region 56 includes an enlarged opening 90a, which provides a larger area for the guiding member 76 to enter the guide track 19. In use, the second connector 26 is pulled by tether 16 (thereby providing relative translation of the first and second connectors 24, 26 in the first axial direction) such that the guide member 76 is guided along an entrance channel 91a extending parallel to the longitudinal axis 21 of the first connector 24. The guide member 76 is subsequently received in and guided along a first helical channel 92 (thereby also providing relative rotation between the first and second connectors 24, 26) towards the first stop region 62. The relative movement between the first and second connectors 24, 26 in the first axial direction stops when the guide member 76 abuts a first stop member 94, which may be defined by an end of the guide track 19 in the first stop region 62. The engagement of the guide member 76 with the stop member 94 may provide a first mechanical feedback signal that the relative movement between the first and second connectors 24, 26 in the first axial direction should be reversed to the second axial direction in order to move the guide member 76 to the locking region 58. At this point, the second connector 26 may be allowed to drop under the action of gravity (thereby providing relative translation of the first and second connectors 24, 26 in the second axial direction) towards a second helical channel 93, which guides the guide member 76 towards the locking region 58. The relative axial position of the first and second axial load shoulders 68, 72 is such that the first and second axial load shoulders 68, 72 engage one another before the guide member 76 reaches an end of the guide track 19 in the locking region 56. As such, the guide member 76 may be prevented from contacting an end 99 of the guide track 19 in the locking region 56. This may protect the guide track 19 and guide member 76 from damage, while enabling greater loads to be transmitted between the first and second connectors 24, 26. When the guide member 76 is located in the locking region 58, a first sequence of relative movement between the first and second connectors 24, 26 is completed with the first and second connectors 24, 26 provided in a connected state. The first and second connectors 24, 26 may be held in this connected state while under tension.

In order to release the connection, the tether 16 may apply a further pulling force to the second connector 26 causing the guide member 76 to travel up into a third helical channel 95, which guides the guide member 76 to the second stop region 96. The relative movement between the first and second connectors 24, 26 in the first axial direction stops when the guide member 76 abuts a second stop member 96, which may be defined by an end of the guide track 19 in the second stop region 64. The engagement of the guide member 76 with the stop member 96 may provide a second mechanical feedback signal that the relative movement between the first and second connectors 24, 26 in the first axial direction should be reversed to the second axial direction in order to move the guide member 76 to the locking region 58. At this point, the second connector 26 may again be allowed to drop under the action of gravity towards a fourth helical channel 97, which guides the guiding member 76 towards the an exit channel 91b. This completes a second sequence of relative movement between the first and second connectors 24, 26.

In the present example, the first connector 24 includes three circumferentially spaced guide tracks 19 and the second connector 26 includes three circumferentially spaced guide members 76. The entrance channel 91a may function as such for one guide member 76 and then subsequently function as an exit channel 91b for another guide member 76, as the first and second connectors 24, 26 rotate relative to one another, and so on.

Figure 9 illustrates an alternative releasable connector assembly 110 in a connected state with a tether 16. The tether 16 is further connected to a floating structure 12. As such, the tether 16 may also function as a mooring line. While Figure 9 illustrates two connector assemblies 110 with two tethers/mooring lines 16, in practice any number of connector assembles 110 and tethers/mooring lines 16 may be provided to moor the floating structure 12 to the seabed 22.

The alternative releasable connector assembly 110 includes a first connector 124 and a second connector 126. The first and second connectors 124, 126 include many of the same features as the first and second connectors 24, 26, respectively. Therefore, like features have been assigned like numerals, incremented by 100. These features are not described here again for the sake of brevity.

Referring to Figure 10, the first connector 124 is oriented in an opposite direction to that of the first connector 24 illustrated in Figures 1 and 2. In Figures 9 and 10, the base end 138 is connected to a pile structure 20 and the receiving end 134 is oriented upwards such that the second connector 126 can be lowered in the direction of arrowhead 130 into the cavity 137 of the first connector 124.

Referring to Figures 11 and 12, the first connector 124 differs from the first connector 24 in that the base end 138 includes a flange arrangement 150 for connecting the first connector 124 to the pile structure 20. The flange arrangement 150 permits the first connector 124 to be bolted or otherwise secured to the pile structure 20. Further, the intermediate section 136 of the first connector 124 includes an additional segment 151 towards the base end 138, which provides a space to accommodate the second connector 126 when the guide member 176 is located in the first and second stop regions 194, 196.

Referring to Figure 13, the second connector 126 differs from the second connector 124 in that the leading end 180 comprises a cone profile 184. The leading end 180 does not include a first attachment mechanism 86 like the second connector 26, since in this arrangement the second connector 124 is received in the cavity 137 of the first connector 124 by virtue of gravity alone. As such, the second connector 126 may be designed to have a weight sufficient to overcome any buoyancy forces acting on the second connector 126 as it is lowered towards the first connector 124. Alternatively, with reference to Figure 14, the leading end 180 of the second connector 126 may comprise a detachable cone element 185 removable from the second connector 126.

The detachable cone element 185 may permit access to inside the second connector 126, for example to locate a weighted material therein. The cone element 185 may include tabs 187 configured to snap-fit with slits 189 of the second connector 126.

Referring to Figure 15, the first and second connectors 124, 126 are shown in a connected state. As mentioned above in relation to the connector assembly 10, and as illustrated in Figure 15, the relative axial position of the first and second axial load shoulders 168, 172 is such that the first and second axial load shoulders 168, 172 engage one another before the guide member 176 reaches an end 199 of the guide track 119 in the locking region 156. As such, the guide member 176 is prevented from contacting the end 199 of the guide track 119 in the locking region 156.

Figure 16 illustrates a further alternative releasable connector assembly 210 including a first connector 224 and a second connector 226. The first and second connectors 224, 226 include many of the same features as the first and second connectors 24, 26, respectively. Therefore, like features have been assigned like numerals, incremented by 200. These features are not described again here for the sake of brevity.

The alternative connector assembly 210 is configured to permit an electromagnetic signal to be transmitted therethrough. Referring to Figure 17, the first connector 224 includes two component parts 234a, 234b configured to be assembled together with an electromagnetic support plate 261 positioned axially between the component parts 234a, 234b. The first connector 224 further includes one or more stiffening members, such as stiffening disks 271, around a circumference of the first connector 224.

Referring to Figures 18 and 19, the first connector 224 differs from the first connector 24 in that the first connector 224 includes a first electromagnetic shoulder 263 axially spaced from the first projection 266. A first electromagnetic connecting member 265 is provided on the first electromagnetic shoulder 263 and may be operatively connected to the electromagnetic support plate 261. The first connector 224 further includes a separate stop member 273, such as a stop ring, configured for the leading end 280 of the second connector 226 to abut when the guide member 276 is located at the first and second stop regions 262, 264, such that the guide member 276 does not contact an end of the guide track 219 in the first and second stop regions 262, 264. Providing the stop member 276 separately from the guide track 219 may prevent or reduce axial forces acting on the guide member 276 and guide track 219.

The second connector 226 differs from the second connector 26 in that the second connector 226 includes a second electromagnetic shoulder 269 axially spaced from the second axially load shoulder 270. A second electromagnetic connecting member 275 is provided on the second electromagnetic shoulder 269. The first and second electromagnetic shoulders 263, 269 are configured to be axially aligned when the guide member 276 is located in the locking region 258 of the guide track 219, such that an electromagnetic connection is made between the first and second electrical connecting members 263, 275. The first and second electromagnetic members 263, 275 may include one or more electrodes and sockets.

The guide member 276 is provided on the second electromagnetic shoulder 276 (instead of the second axial load shoulder 270, as in the second connector 26 and second connector 126). The second electromagnetic shoulder 276 is located closer to the leading end 280 of the second connector 226 than the second axial load shoulder 270. Therefore, the second electromagnetic shoulder 276 enters the cavity 237 of the first connector 224 before the second axial load shoulder 270. As such, the second electromagnetic shoulder 269 includes the second tapered surface 274 (instead of the second axial load shoulder 270). The second tapered surface 274 is provided on a side of the electromagnetic shoulder 269 opposite to the second electromagnetic connecting member 275. As noted above, the second tapered surface 274 may engage the first tapered surface 269 of the first projection 266 as the second connector 226 enters the first cavity 237 of the first connector 224. This may result in relative rotation between the first and second connectors 224, 226 such that the guide member 276 is brought into alignment with the entry region of the guide track 219.

The relative axial positon of the first axial load shoulder 268 and the first electromagnetic connecting member 263, and the second axial load shoulder 270 and the second electromagnetic connecting member 269, is such that the electromagnetic connection is established at the same time as the first and second axial load shoulders 268, 272 engage one another. This may reduce stresses acting on the first and second electromagnetic connecting members 265, 275 by virtue of the first and second load shoulders 266, 270 being engaged when the electromagnetic connection is established. The first and second electromagnetic connecting members 265, 275 are suitable for use in wet environments, such as under water or subsea. For example, the first and second electromagnetic connecting members 265, 275 may comprise a wet-mate connection.

The connector assembly 210 further comprises a torque limiter. The torque limiter is configured to rotationally lock the first and second connectors 224, 226 relative to one another when in the connected state. The torque limiter may reduce or prevent rotational forces acting on the first and second electromagnetic connecting members 265, 275 when they are connected. The torque limiter includes a first torque limiting structure 241 (such as a recess or indent) defined by the first axial load shoulder 266, and a second torque limiting structure 243 (such as a protrusion) provided on the second axial load shoulder 270. The first and second torque limiting structures 241, 243 are configured to engage one another when the guide member 276 is located in the locking position 258 of the guide track 219. The first and second torque limiting structures 241, 243 are dimensioned such that the second torque limiting structure fits tightly in the first torque limiting structure.

Figure 20 illustrates the first and second connectors 226, 264 in a connected state.

The cavity 237 of the first connector 226 includes an enlarged region 249 to accommodate the second axial load shoulder 270 as the first and second connectors 224, 226 rotate relative to one another as the guide member 276 is guided along the guide track 219 from the first stop region 262 to the locking region 258, and from the second stop region 264 to the exit region. The first connector 226 includes a side port 283 for electromagnetic cables to pass through to connect with the first electromagnetic connecting member 265, and the second connector 226 includes a hole 233 for electromagnetic cables to connect with the second electromagnetic connecting member 265.

Claims

CLAIMS: 1. A releasable connector assembly, comprising: a first connector defining a cavity having a first axial load shoulder; and a second connector releasably connectable within the cavity of the first connector, the second connector including a second axial load shoulder, wherein one of the first and second connectors includes a guide track which defines a track profile having an entry region, a locking region and an exit region, and the other of the first and second connectors includes a guide member configured to be received within the guide track, wherein, in use, the guide member is guided along the guide track from the entry region to the locking region during a first sequence of relative movement between the first and second connectors in reverse axial directions to configure the first and second connectors in a connected state, and the guide member is guided along the guide track from the locking region to the exit region during a subsequent second sequence of relative movement between the first and second connectors in reverse axial directions to configure the first and second connectors in a disconnected state, and wherein when the guide member is located at the locking region of the guide track the first and second axial load shoulders are engaged such that axial loading between the first and second connectors is transmitted between the first and second axial load shoulders.
2. The connector assembly according to claim 1, wherein the first sequence of relative movement between the first and second connectors comprises relative translation and relative rotation between the first and second connectors.
3. The connector assembly according to claim 1 or 2, wherein the second sequence of relative movement between the first and second connectors comprises relative translation and relative rotation between the first and second connectors.
4. The connector assembly according to any preceding claim, wherein: the guide track includes a first stop region in which the relative movement between the first and second connectors during the first sequence reverses from a first axial direction to a second axial direction, and the guide track includes a second stop region in which the relative movement between the first and second connectors during the second sequence reverses from the first axial direction to the second axial direction.
5. The connector assembly according to claim 4, wherein the first connector comprises a stop member spaced from the guide track for the second connector to abut at the end of travel in the first axial direction during the first and/or second sequences of relative movement between the first and second connectors.
6. The connector assembly according to any preceding claim, wherein the guide track comprises one or more helical channels configured to guide the guiding member between the entry region, the locking region and the exit region.
7. The connector assembly according to any preceding claim, wherein the first connector comprises a receiving end, an intermediate portion and a base end.
8. The connector assembly according to claim 7, wherein the intermediate portion comprises two or more segments, which when connected together form a cylindrical shape.
9. The connector assembly according to claim 8, wherein the first connector comprises the guide track and the second connector comprises the guide member, and wherein the two or more segments are dimensioned and arranged such that the guide member is received and guided in a space defined between the two or more segments.
10. The connector assembly according to any one of claims 7 to 9, wherein the receiving end comprises a frustoconical shape configured to funnel the second connector towards the intermediate section of the first connector.
11. The connector assembly according to any preceding claim, wherein the entry region of the guide track comprises an enlarged opening.
12. The connector assembly according to any preceding claim, wherein the first axial load shoulder is provided by a first projection, the first projection comprising a first tapered surface, wherein the second axial load shoulder is provided by a second projection, the second projection comprising a second tapered surface, wherein the first and second tapered surfaces are configured to engage each other as the second connector is received in the cavity of the first connector such that the guide member is brought into alignment with the entry region of the guide track.
13. The connector assembly according to any preceding claim, wherein the guide member comprises a protrusion and the guide track comprises a slot configured to receive the protrusion.
14. The connector assembly according to any preceding claim, wherein the second connector comprises a leading end and a trailing end, the leading end comprising a curved profile.
15. The connector assembly according to any preceding claim, wherein a relative axial position of the first and second axial load shoulders is such that the first and second axial load shoulders engage one another before the guide member reaches an end of the guide track in the locking region.
16. The connector assembly according to any preceding claim, wherein a relative position of the first and second axial load shoulders is such that the first and second load shoulders are axially misaligned when the guide member is located at the entry region of the guide track.
17. The connector assembly according to any preceding claim, wherein the connector assembly is configured to transmit an electromagnetic signal therethough.
18. The connector assembly according to claim 17, wherein the first connector comprises a first electromagnetic connecting member and the second connector comprises a second electromagnetic connecting member, and wherein an electromagnetic connection between the first and second electromagnetic connecting members is established at the same time as the first and second load shoulders engage one another.
19. The connector assembly according to claim 18, wherein the first electromagnetic connecting member is provided on a first electromagnetic shoulder and the second electromagnetic connecting member is provided on a second electromagnetic shoulder.
20. The connector assembly according to claim 19, when dependent on claim 12, wherein the second electromagnetic shoulder comprises the second tapered surface.
21. The connector assembly according to any preceding claim, comprising a torque limiter configured to rotationally lock the first and second connectors relative to one another.
22. The connector assembly according to any preceding claim, wherein the one of the first and second connectors defining the guide track defines two or more guide tracks and the other of the first and second connectors including the guide member track includes two or more guide members, wherein each guide member is configured to be received in a respective guide track.
23. A method of forming a releasable connection, comprising: providing a first connector defining a cavity having a first axial load shoulder; receiving a second connector in the cavity of the first connector, the second connector including a second axial load shoulder; wherein one of the first and second connectors includes a guide track which defines a track profile having an entry region, a locking region and an exit region, and the other of the first and second connectors includes a guide member configured to be received within the guide track, receiving the guide member in the entry region of the guide track; guiding the guide member along the guide track from the entry region to the locking region during a first sequence of relative movement between the first and second connectors in first and second axial directions to configure the first and second connectors in a connected state, engaging the first and second load shoulders as the first and second connectors are configured in the connected state such that axial loading between the first and second connectors is transmitted between the first and second axial load shoulders; and guiding the guide member along the guide track from the locking region to the exit region during a second sequence of relative movement between the first and second connectors in first and second axial directions to configure the first and second connectors in a disconnected state.
24. The method according to claim 23, comprising: applying a first force to one of the first and second connectors while the other of the first and second connectors is held substantially stationary such that relative movement between the first and second connectors in the first axial direction is provided; and applying a second force to one of the first and second connectors while the other of the first and second connectors is held substantially stationary such that relative movement between the first and second connectors in the second axial direction is provided
25. The method according to claim 23 or 24, comprising establishing an electromagnetic connection between the first and second connectors.