KR101825685B1 - Fire fighting power controller device with apartment house - Google Patents

Abstract

The present invention relates to a fire fighting power controller device installed in an apartment house and, more specifically, to a fire fighting power controller device installed in an apartment house which can easily take action with emergency power even in a case when power supply is blocked from the outside due to a blackout, fire or the like and which marks a location of a control unit to effectively cope with an emergency situation such as fire or the like.

Description

FIRE FIGHTING POWER CONTROLLER DEVICE WITH APARTMENT HOUSE FIELD OF THE INVENTION [0001]

The present invention relates to a fire control system for a fire fighting power supply installed in a residential house in the field of fire fighting technology. More particularly, the present invention relates to a fire control system for a fire extinguishing system, The present invention relates to a power supply controller for a fire-fighting power supply installed in a multi-family house so as to effectively respond to an emergency such as a fire.

Generally, a building or the like is provided with a fire-fighting system for detecting and extinguishing a fire when it occurs.

The conventional fire fighting system as described above includes a sensing unit for sensing the occurrence of a fire, a control unit for activating the alarm device or activating the sprinkler and the fire retarding shutter when the sensing unit detects the occurrence of a fire, Fire-fighting equipment such as a sprinkler or a fire-retarding shutter.

However, the conventional fire fighting system can not easily cope with the interruption of the power supply from the outside due to power failure, fire or the like.

In the prior art which partially alleviates such a problem, Korean Patent Registration No. 10-1644084 discloses a 'fire-fighting facility control system for apartment houses'.

However, such a conventional fire-fighting facility control system of a multi-family house has a problem that it is difficult to effectively cope with an emergency such as a fire because the position of the control unit can not be easily confirmed.

Korea Patent Registration No. 10-1049796 (July 19, 2011) 'Fire Control System for Apartment Complex'

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an electric power supply system capable of easily responding through an emergency power source even in a power- And to provide a fire control power controller installed in a multi-family house so as to effectively cope with an emergency such as a fire.

The problems to be solved by the present invention are not limited to those mentioned above, and other solutions not mentioned can be clearly understood by those skilled in the art from the following description.

In order to accomplish the above object, the present invention provides a wireless communication module installed in a room and capable of mutual transmission and reception of signals, a wireless communication module for detecting a fire situation in a building or an alarm sound when receiving a fire signal transmitted from another wireless communication module A plurality of sensing units 110 having an alarm device 117 for supplying power to the battery 110 and a battery 118 for supplying power; A controller 120 for operating the fire extinguishing system 130 by a short range wireless signal of the sensing unit 110, and a wireless communication module for wirelessly communicating with the sensing unit 110 installed in the room. A power supply unit 150 for supplying power from the outside to the sensing unit 110 and charging the battery 118 with power; And an emergency power supply unit 160 that allows the power of the battery 118 to be supplied to the fire extinguishing equipment unit 130 in response to an external power supply cutoff, A power line 151 to which the power supplied from the power line is transferred and the alarm device 117 is connected to the other end; And an auxiliary power line 152 having both ends connected to the power line 151 and connected to the battery 118 between both ends of the power line 151. The battery 118 is connected to the power line 151, The emergency power supply 160 supplies power to the alarm device 117 and the emergency power supply 160. The emergency power supply 160 is connected to the other end of the auxiliary power lead 152 and the other end of the power lead 151, An emergency power lead 161 connected to the power lead 151 so as to be positioned between the other end and connected to the fire extinguishing facility 130 at the other end; A connection switch 162 connected to the emergency power lead 161; And a power supply detection sensor connected to the power line 151 so as to be positioned between one end of the power line 151 and one end of the auxiliary power line 152, The control unit 120 controls the connection of the connection switch 162 to the connection unit 162 in response to a detection signal of the power supply detection sensor 163, A power supply controller for a fire extinguishing power supply installed in a public housing for allowing a power supply of the battery (118) to be transmitted to the fire extinguishing equipment part (130) by tangent to a switch (162) (200), wherein the display unit (200) comprises: a casing (210) in which the control unit (120) is housed inward; A normal lamp 220 provided in the casing 210; An emergency lamp (230) provided in the casing (210); A first power connecting line 240 connecting the normal lamp 220 and the power line 151; And a second power connection line 250 connected to the emergency power line 161 so that one end is connected to the emergency lamp 230 and the other end is positioned between the connection switch 162 and the fire extinguishing facility 130, The normal lamp 220 is illuminated in green by the power supplied from the power line 151 to the first power connection line 240 to indicate the position of the controller 120, The lamp 230 is turned on in red by a power source that is transmitted from the battery 118 to the second power source connection line 250 in response to the interruption of external power supply, And controls the fire extinguishing system 130 to be smoothly performed through quick positioning of the controller 120. The present invention also provides a fire control system for a fire extinguishing system.

According to the present invention, it is possible to easily cope with an interruption of power supply from the outside due to power failure, fire or the like, and also to effectively respond to an emergency such as fire by displaying the position of the control unit.

The effects of the present invention are not limited to those mentioned above, and other solutions not mentioned may be clearly understood by those skilled in the art from the following description.

FIG. 1 is a conceptual diagram schematically showing a fire-fighting power controller installed in a multi-house according to the present invention.
FIG. 2 is a state diagram showing a state in which a fire-fighting power controller installed in a multi-family house according to the present invention is applied to a home.
FIG. 3 is a conceptual diagram illustrating a power supply unit and an emergency power supply unit in a fire control system installed in a multi-family house according to the present invention.
FIG. 4 is a conceptual diagram illustrating a state in which a display unit is provided in a fire fighting power controller device installed in a multi-unit house according to the present invention.
And
FIG. 5 is a cross-sectional view illustrating a display unit in a fire fighting power supply controller installed in a multi-unit house according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. And should not be construed as limited to the embodiments described herein.

Since the embodiments according to the concept of the present invention can make various changes and have various forms, specific embodiments are illustrated in the drawings and described in detail herein.

It should be understood that the embodiments according to the concept of the present invention are not limited to the particular mode of disclosure but include all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.

Since the present invention uses the later-described Literature No. 1644084 as it is, all the features of the device configuration described below can be understood as the matters described in the registered patent No. 1644084. [

However, in the present invention, the 'fire-fighting facility control system of the apartment house' is replaced with the 'fire-fighting power controller device installed in the apartment house' among the configurations disclosed in the above-mentioned registered patent No. 1644084, And the description of its operation is further included, and this part is the most important constitutional feature.

Therefore, the device structure, characteristics, and operation relationship described below will be referred to as the content of the above-mentioned registration number 1644084, and the configuration related to the main features of the present invention will be described in detail at the rear end.

1 to 2, a fire-fighting power supply apparatus using self-power generation in the apartment house according to the present invention includes a sensing unit 110, a control unit 120, a fire-fighting equipment unit 130, and a fire notification unit 140, . ≪ / RTI >

The sensing unit 110 senses whether a gas or a gas which may cause a fire or suffocation is leaked and transmits a sensing signal to the control unit 120. The sensing unit 110 senses whether or not a fire has occurred And a gas leak detector 114 for detecting whether or not the gas is leaked.

The fire sensor 112 may be a differential type sensor that operates when the ambient temperature becomes higher than a certain rate of increase or a temperature sensor that operates when the ambient temperature becomes a certain temperature or higher and uses a bimetal, An ultraviolet / infrared flame detector combined with a photoelectric detector activated by a change in the amount of light incident on the device or an ultraviolet sensor detecting ultraviolet wavelength characteristics emitted from a flame and an infrared sensor detecting infrared wavelength characteristics; A fire detector of a suitable type can be selected according to the type and the like.

The gas leakage detector 114 may be provided to detect LNG or LPG gas depending on the kind of gas used in the building or may be provided to detect toxic gas such as carbon monoxide which is fatal to the human body.

The sensing unit 110 may include an occupant sensor 116. The occupant sensor 116 is a component for detecting presence of a person inside the building, and may be an infrared sensor for detecting a body temperature of a person or detecting whether there is a movement in a space to determine whether a person is present or not.

The sensing unit 110 may include a wireless communication module. The wireless communication module is a component that is configured to communicate with the control unit 120 wirelessly, not via a wire.

The wireless communication module is provided to both the sensing unit 110 and the control unit 120 and may be provided to enable unidirectional or bidirectional communication.

The wireless communication module may be configured to wirelessly communicate with a ZigBee system. ZigBee is one of the IEEE 802.15.4 standards supporting short-range communication and is a wireless communication method for short-range communication and ubiquitous computing in the wireless networking field of home or office.

The Zigbee scheme has advantages of small size, low power consumption, and low cost compared with the existing technology.

Of course, the wireless communication scheme of the sensing unit 110 and the controller 120 of the present invention is not limited to the ZigBee scheme, and may be implemented in other ways.

The sensing unit 110 may further include an alarm device for generating an alarm sound.

The alarm device alerts the occupant by generating an alarm sound or an alarm light, regardless of whether the sensing unit 110 senses the occurrence of a risk factor such as a fire or a gas leak, to the controller 120. Accordingly, the alarm device may include a speaker and a beacon.

The control unit 120 detects a fire situation in the sensing unit 110 and alerts immediately to the occupant regardless of the fact that the sensing unit 110 transmits a signal to the control unit 120. Thus, It can be warned more quickly, and it is possible to maximize the time for the occupant to be evacuated.

The fire-fighting equipment 130 is a component that suppresses fire and gas leakage quickly, prevents the fire from spreading further, and assists the evacuation of the occupant. When a fire occurs, Fire alarms, fire alarms for fire alarms, emergency alarms, visual alarms for the hearing impaired, fire alarms for fire alarms, An emergency lamp to guide the evacuation passage, an evacuation ladder to help evacuate the room, a ventilation fan to vent the room smoke and gas to the outside, and a gas leakage breaker to shut off the gas valve when the gas leakage is detected.

The fire extinguishing equipment 130 is operated by an operation signal of the control unit. When the control unit 120 receives a fire or gas leak detection signal from the sensing unit 110, Fire fighting equipment suitable for the situation is activated.

In addition, the fire notification unit 140 may be an automation system that automatically notifies a fire department and police stations designated by a signal of the controller 120 when a fire situation (occurrence of fire or gas leakage) It is a view of religion.

The fire notification unit 140 may also send information sensed by the sensing unit 110 when a fire situation is notified to the related facility.

That is, information such as the occurrence of a fire, the leakage of gas, and the presence or absence of a fire sensed by the sensing unit 110 is transmitted to a related organization so that a more appropriate response is possible.

The fire notification unit 140 may be configured to transmit the occurrence of a fire situation and information of a building to a telephone, a mobile phone, a PDA, or the like of a related person who is registered in advance as well as a related organization. Therefore, even if a fire occurs when a resident goes out, it can be notified immediately after a fire occurs, and it is possible to notify a resident's family member or a related person immediately, thereby enabling faster response.

The controller 120 and the control unit 120 are connected to the control unit 120 and the fire extinguishing unit 130. However, the present invention is not limited to this, .

The wireless communication module included in the sensing unit 110 may be configured to receive a signal transmitted from another sensor.

That is, a plurality of sensing units 110 may be installed in various places in the building. When a sensing unit 110 installed inside the building senses a fire situation, And is transmitted through a wireless communication module.

The fire sensing signal may be received by the sensing unit 110 provided at another location in the wireless communication module to operate the alarm device.

Accordingly, when a fire situation occurs in the building, since the detectors provided in the building directly transmit and receive fire detection signals without going through the control unit 120, the fire alarm can be performed more quickly.

In addition, since a fire alarm can be issued without a control unit, it can be realized at a lower cost in a small building.

Referring to FIG. 2, an example in which a fire control system installed in a dwelling house according to the present invention is applied to a building is provided with a sensing unit 110 in a living room or each room.

The sensing unit 110 may be a fire sensor 112 for detecting a fire or an occupant sensor 116 for sensing whether a person is in the room.

A gas leakage detector 114 may be provided at a place where gas leakage is likely to occur, such as in a kitchen or a boiler room.

It is preferable that the control unit 120 is provided at a convenient place such as a living room or a door.

Since the control unit 120 and the sensing unit 110 communicate with each other through wireless communication, the control unit 120 and the sensing unit 110 are freely installed compared with a method of wirelessly communicating, and can freely install in a place where fire or gas leakage can be best detected. have.

Also, a fire fighting equipment 130 operated by the control unit 120 is installed. In the description of this embodiment, an example in which the sprinkler 132 is applied as the fire-fighting equipment 130 is shown. However, the present invention is not limited thereto, and other fire-fighting equipment such as a fire-fighting shutter and a ventilation fan may be added.

The sprinkler 132 is provided to spray fire water into each living room and room, and can be supplied directly to the water supply to receive fire water.

A fire notification unit 140 may be provided to notify the fire department of the fire situation according to a signal of the control unit 120. [

The fire notification unit 140 may be installed at a place where the control unit 120 is installed.

Referring to FIG. 3, the power supply unit 150 supplies power to the sensing unit 110, and charges the battery 118.

The power supply unit 150 includes a power supply line 151 through which power is supplied from the outside to one end and the alarm device 117 is connected to the other end and the battery 118 is connected to the power supply line 151 in parallel And an auxiliary power lead wire 152 for connecting the auxiliary power lead wires.

The power supply unit 150 allows the power supplied from the outside to be smoothly transmitted to the sensing unit 110 while allowing the power supplied from the battery 118 to be discharged from the battery 118 So that power supply to the alarm device 117 can be performed quickly.

Both ends of the auxiliary power lead wire 152 are connected to the power lead wire 151 and the battery 118 is connected between both ends thereof. It should be understood that the power supplied from the outside flows from one end of the auxiliary power lead wire 152 to the other end.

The battery 118 is charged as power supplied from the outside passes through the auxiliary power lead 152 through the power lead 151.

When the sensing unit 110 includes at least one of the fire sensor 112 and the gas sensor 114, the power supply unit 150 may include the fire sensor 112, the gas sensor 114, It is a matter of course that power can be supplied.

At this time, the power line 151 may be connected to the fire detector 112 or the gas detector 114 together with the alarm device 117 while the other end is branched.

This is because it is possible to secure the detection state of the apartment house through the smooth operation of the sensing unit 110 while receiving the supply of power from the outside normally, and at the same time, in an emergency state due to fire, So that the sensing state of the battery 118 can be continuously supplied without power supply.

Accordingly, the present invention can detect the occurrence of a dangerous factor such as a fire or a gas leak through the alarm device 117 through smooth power supply through the battery 118, even when the power supply is interrupted from the outside By generating an alarm sound or an alarm light, alarm can be given to the occupant.

The present invention may further include an emergency power supply unit 160 that allows the power of the battery 118 to be supplied to the fire extinguishing system 130 in response to an external power cutoff.

The emergency power supply unit 160 is connected to the power line 151 so that one end thereof is positioned between the other end of the auxiliary power line 152 and the other end of the power line 151, A connection switch 162 connected to the emergency power line 161 and a connection switch 162 connected between one end of the power line 151 and one end of the auxiliary power line 152, And a power supply detection sensor 163 connected to the power line 151 for detecting a power supply cutoff state from the outside.

The connection switch 162 maintains an off state, that is, a disconnection state, normally when power is supplied from the outside.

It is to be understood that the fire fighting equipment 130 receives power from another external power source.

The control unit 120 tangles the connection switch 162 according to a detection signal of the power supply detection sensor 163 so that the power of the battery 118 can be transmitted to the fire fighting equipment unit 130.

This is for the purpose of enabling the fire fighting equipment unit 130 to operate smoothly when the power supply from the outside is cut off.

The emergency power supply unit 160 has both ends and is connected to an emergency power supply line 151 connected to the power supply line 151 such that one end thereof is positioned between the other end of the auxiliary power supply line 152 and the other end of the power supply line 151, An emergency alarm device 165 connected to the other end of the emergency power line 164 and an emergency switch 166 connected to both ends of the emergency power line 164.

The emergency switch 166 maintains an off state, that is, a disconnection state, normally when power is supplied from the outside.

The emergency alarm device 165 may be a speaker or a warning light for generating an alarm sound or an alarm light, and informs a resident of the apartment or a resident of the apartment when the power supply from the outside is cut off.

The control unit 120 tangles the emergency switch 162 according to a detection signal of the power supply detection sensor 163 so that the power of the battery 118 can be transmitted to the emergency alarm device 165 .

Accordingly, the fire-fighting power controller device installed in the apartment house according to the present invention can quickly respond to the interruption of the power supply from the outside due to power failure, fire, or the like.

In the present invention, the structure of the display unit 200 for displaying the position of the controller 120 is further implemented as shown in FIGS.

The display unit 200 can easily recognize the location of the control unit 120 by a tenant or an administrator residing in the apartment, thereby effectively coping with an emergency such as a fire.

The display unit 200 includes a casing 210 in which the control unit 120 is accommodated, a normal lamp 220 provided in the casing 210, an emergency lamp 230 provided in the casing 210, A first power connecting line 240 connecting the normal lamp 220 to the power line 151 and a second power connecting line 240 connecting one end to the emergency lamp 230 and the other end connected to the connection switch 162, And a second power connection line 250 connected to the emergency power line 161 so as to be positioned between the first power line 130 and the second power line.

The casing 210 stably protects the control unit 120, which is received in the inside, while being installed in an indoor wall such as a living room or a door.

The casing 210 can be provided with a door 211 for opening and closing the inside of the casing 210. The opening and closing of the casing 210 can be controlled together with the control of the controller 120 according to the opening of the door 211.

The door 211 may be made transparent so that the controller 120 can be visually confirmed.

The normal lamp 220 and the emergency lamp 230 are preferably disposed on both sides of the casing 210.

The normal lamp 220 is illuminated in green by the power supplied from the power line 151 to the first power line 240 to indicate the position of the controller 120.

Accordingly, the occupant of the apartment house, the manager, etc. can normally live in the position perceived with respect to the control unit 120, so that the user can quickly cope with an emergency such as a fire.

The emergency lamp 230 is turned on in red by a power source supplied from the battery 118 to the second power source connection line 250 in response to an external power supply cutoff, Meanwhile, the control unit 120 is controlled to be smoothly controlled through quick positioning.

That is, the emergency lamp 230 is turned on by the power of the battery 118 while the connection switch 162 is tangent to the emergency lamp 230 under the control of the control unit 120 in accordance with the detection signal of the power supply detection sensor 163 do.

Accordingly, the occupant of the apartment house, the manager or the like recognizes that the power supply from the outside is blocked through the emergency alarm by the emergency alarm device 165, and then, after the emergency lamp 230 is turned on, It is possible to check the position of the fire extinguishing system 120 and smoothly control the fire extinguishing system 130.

When the emergency alarm device 165 is not aware of the emergency alarm, the control unit 120 recognizes that the power supply from the outside is blocked through the lighting of the emergency lamp 230, So that the control of the fire fighting equipment 130 can be smoothly performed.

The display unit 200 may further include a reflector 260 for reflecting light of the normal lamp 220 and the emergency lamp 230 forward.

The reflector 260 is disposed behind the normal lamp 220 and the emergency lamp 230 so that light from the normal lamp 220 or the emergency lamp 230 can be reflected forward.

Accordingly, the occupant or manager residing in the apartment can easily recognize the light of the normal lamp 220 or the emergency lamp 230 by the naked eye, thereby quickly recognizing the position of the controller 120 Of course.

The lower portion of the reflection plate 260 is vertically movably connected to the upper portion of the casing 210, and the length of the reflector 260 protruding upward from the casing 210 is variably adjusted.

For example, the casing 210 has a guide hole 212 through which the lower portion of the reflection plate 260 is inserted.

The display unit 200 further includes a fixing ring 270 provided around the guide hole 212 for pressing and fixing the reflection plate 260.

The length of the reflector 260 protruding upward from the upper portion of the casing 210 is variably adjusted by upward and downward movement by pulling upward and downward by artificial pressurization, (Not shown).

The reflection plate 260 is provided at its lower portion with a lift preventing protrusion 261 for preventing the guide plate 212 from being separated from the guide hole 212.

Preferably, the reflection plate 260 is stopped at a certain point while the downward protrusions 262 are protruded outward between the upper and lower ends.

It is preferable that the upper surface of the reflection plate 260 is rounded forward so that the light of the normal lamp 220 or the emergency lamp 230 is directed downward forward.

Accordingly, the degree of forward light reflection of the normal lamp 220 and the emergency lamp 230 can be appropriately adjusted.

This is to minimize the inconvenience of living by the light of the normal lamp 220 at normal times and to maintain a state in which light can be smoothly recognized due to the lighting of the emergency lamp 230. [

Accordingly, the display unit 200 can display the position of the controller 120, thereby effectively coping with an emergency such as a fire.

110: sensing unit 118: battery
120: control unit 130:
132: sprinkler 140: fire notification section
150: Power supply unit 160: Emergency power supply unit
200: display unit 210: casing
211: door 212: guide ball
220: normal lamp 230: emergency lamp
240: first power connecting line 250: second power connecting line
260 Reflector 261 Lift protrusion
262: Fall prevention projection

Claims (1)

A wireless communication module installed in a room and capable of mutual transmission and reception of signals, an alarm device 117 for detecting an alarm sound when a fire situation in a building is detected or a fire signal transmitted from another wireless communication module is received, A plurality of sensing units 110 having a battery 118;
A controller 120 for operating the fire extinguishing system 130 by a short range wireless signal of the sensing unit 110, and a wireless communication module for wirelessly communicating with the sensing unit 110 installed in the room.
A power supply unit 150 for supplying power from the outside to the sensing unit 110 and charging the battery 118 with power; And
And an emergency power supply unit (160) for allowing the power of the battery (118) to be supplied to the fire fighting equipment unit (130)
The power supply unit 150,
A power lead 151 to which power is supplied from the outside to one end and to which the alarm device 117 is connected at the other end; And
And an auxiliary power lead wire (152) having both ends connected to the power lead wire (151) and having the battery (118) connected between both ends thereof,
The battery (118)
Supplies power to the alarm device (117) and the emergency power supply (160) according to the interruption of the external power supply,
The emergency power supply unit 160,
An emergency power source connected to the power line 151 so that one end thereof is positioned between the other end of the auxiliary power line 152 and the other end of the power line 151 and the other end is connected to the fire- Conductor 161;
A connection switch 162 connected to the emergency power lead 161; And
A power supply detection sensor 163 connected to the power line 151 so as to be positioned between one end of the power line 151 and one end of the auxiliary power line 152, ),
The connection switch (162)
The power supply is normally maintained in a disconnected state when power is supplied from the outside,
The control unit (120)
A power supply controller 170 installed in a housing for allowing the power of the battery 118 to be transmitted to the fire-fighting equipment 130 by tangentially connecting the connection switch 162 according to a detection signal of the power- In this case,
And a display unit (200) for displaying the position of the controller (120)
The display unit 200 displays,
A casing 210 in which the control unit 120 is accommodated and a door 211 is provided;
A normal lamp 220 provided in the casing 210;
An emergency lamp (230) provided in the casing (210);
A first power connecting line 240 connecting the normal lamp 220 and the power line 151;
A second power connection line 250 connected to the emergency power line 161 such that one end is connected to the emergency lamp 230 and the other end is positioned between the connection switch 162 and the fire extinguishing facility 130; And
And a reflector 260 disposed behind the normal lamp 220 and the emergency lamp 230 to reflect the light of the normal lamp 220 and the emergency lamp 230 forward,
The door (211)
Transparent, so that the control unit 120 can be visually confirmed,
The normal lamp (220)
A green light is illuminated by the power supplied from the power line 151 to the first power line 240 to indicate the position of the controller 120,
The emergency lamp (230)
The connection switch 162 is tilted under the control of the controller 120 according to a detection signal of the power supply detection sensor 163 in response to the interruption of the power supply from the outside, The control unit 120 is turned on in red by a power source transmitted to the control unit 250 to indicate that the power source from the outside is cut off, And,
The casing (210)
And a guide hole 212 through which the lower portion of the reflection plate 260 is inserted is formed,
The display unit 200 displays,
Further comprising a fixing ring (270) provided around the guide hole (212) for pressing and fixing the reflection plate (260)
The reflector 260 may be formed,
The upper portion of the emergency lamp 230 and the upper portion of the emergency lamp 230 are turned upside down so that the lights of the normal lamp 220 and the emergency lamp 230 are directed downward and are lifted up and down by artificial pressurization, While the position of the fixing ring 270 is adjusted by pressing the pressing ring 270 in accordance with the releasing of the pressing force, And a lowering protrusion (262) protruding outward between the upper and lower ends is provided to stop the lowering protrusion (261) at a certain point. Device.

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