JPH0384293A - Antislip tool for pipe coupling - Google Patents

Abstract

PURPOSE:To facilitate insertion of an insertion port into an annular member formed with lock bodies by a method wherein the lock bodies are positioned in juxtaposition in an annular shape in a state to be movable in a peripheral direction. CONSTITUTION:In insertion of an insertion port 50, a seal member 30 made of, for example, rubber is previously engaged with a recessed groove 42 for a seal member of a socket 40. An antislip tool A is mounted in a recessed part 43 for an antislip tool in a manner that a support ring 10 is positioned on the side deep in the recessed part for an antislip tool. The antislip tools A are set such that respective lock bodies 20 are positioned in juxtaposition in an annular shape at intervals of a proper distance without making contact with each other and are supported by a support ring 10 engaged internally of a recessed groove 21 for the support ring formed in the inner peripheral surface of each lock body 20. Thereby, the insertion port 50 is inserted through an opening part 41 of the socket 40 in a state that an annular part formed with the lock bodies 20 in reduced in diameter, and can be easily engaged with the recessed part 43 for the antislip tool.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a pipe joint used to connect pipes together when installing water pipes, etc. The present invention relates to a retaining tool which is used by being installed in the receptacle so as to prevent the receptacle from coming off from the receptacle.

(Prior art) Recently, as pipe joints used for water pipes, etc., the fittings of one pipe to be connected can be connected by simply inserting the fitting into the socket of the other pipe. Pipe fittings that can be used have been developed. Such pipe joints are usually used with an annular retainer installed in a receptacle into which the socket is inserted to prevent the socket from coming off. For example, Jikai Showa 6
Publication No. 1-1301117 discloses a ring capable of contracting and expanding the diameter, which is used as a retainer to be installed in a receptacle and which locks onto the circumferential surface of an inserted receptacle to prevent the receptacle from coming out. has been done. In the pipe joint disclosed in this publication, a tapered surface is provided on the inner circumferential surface of the socket, the diameter of which gradually decreases toward the opening of the socket into which the socket is inserted. The ring disposed within the socket is divided by a notch provided at one location in the circumferential direction, so that the ring can be contracted or expanded in diameter. On the outer circumferential surface of the ring, two taber surfaces are arranged in parallel in the axial direction so that the boundary portion thereof protrudes outward. Furthermore, inner circumferential retaining blades are provided on the inner circumferential surfaces of both ends of the ring, respectively.

In such a pipe joint, when the fitting is inserted into the ring disposed in the socket, the inner depth (ti) of the ring is inserted.
The outer circumferential tapered surface of ll comes into contact with the tapered surface of the inner circumference of the receptacle, and both of the latching blades are not engaged with the outer circumferential surface of the receptacle, and the receptacle is smoothly inserted into the ring. Then, when the insertion opening is moved in the direction of coming out of the socket while the insertion opening is inserted into the ring, the ring moves together with the insertion opening. This results in
The tapered surface of the outer peripheral surface of the ring on the side of the opening of the socket rotates around the boundary of the outer peripheral surface of the ring so as to come into contact with the inner peripheral surface of the socket, and the tapered surface on the inner peripheral surface of the ring contacts the inner peripheral surface of the socket. The provided latching blade locks onto the outer circumferential surface of the socket, thereby preventing the socket from coming off from the socket.

(Problem to be Solved by the Invention) In the pipe joint disclosed in the publication, as described above, the pipe joint is divided into diameters by a notch provided at one location in the circumferential direction as a stopper. A radially adjustable ring is used, the inner diameter of which is slightly smaller than the outer diameter of a receptacle inserted into the ring without contracting or expanding.

Therefore, a great deal of force is required when expanding the diameter of the ring in order to insert the insertion opening into the ring. Furthermore, when the diameter of the ring is reduced, the parts near the notches in the ring are strongly pulled toward each other, whereas in the opposite parts of the notches, the parts near the notches are pulled around the ring. No pulling force in that direction is applied, and the diameter reduction force does not act much in that area. Therefore, when a force is applied to reduce the diameter of the ring, the diameter is easily reduced in the vicinity of the notch, but the diameter is hardly reduced in the part facing the notch.

As a result, when a diameter reducing force is applied to the ring, the part of the ring near the notch will firmly bite into the circumferential surface of the insertion opening inserted into the ring, but the part facing the notch will firmly bite into the circumferential surface of the insertion opening inserted into the ring. The ring does not firmly bite into the circumferential surface of the socket, and the force of the ring to prevent the socket from coming off is not constant in the circumferential direction of the socket, and the effect of preventing the socket from coming off from the socket is significant. There is a risk that it will decrease.

The present invention is intended to solve the above-mentioned conventional problems, and its purpose is to easily fit the socket inserted into the socket, and to fit only a portion of the socket in the circumferential direction. To provide a retaining tool for a pipe joint which can prevent a strong retaining force from acting and has a large effect of preventing an insertion opening from coming off from a socket.

(Means for Solving the Problems) The pipe fitting retainer of the present invention is installed in a socket into which a socket to be connected is inserted, and is latched to the circumferential surface of the socket to be inserted into the socket. This is a fitting for a pipe fitting that prevents the socket from coming off from the socket, and the pipe joints are each fitted with an appropriate distance from each other so as to be able to lock onto the circumferential surface of the socket inserted into the socket. A plurality of locking bodies are arranged side by side in an annular shape, each having a concave groove continuous in the circumferential direction on its inner peripheral surface, and each of the locking bodies is arranged side by side in a ring shape. In order to achieve this, the above-mentioned object is achieved.

(Example) The present invention will be described below with reference to Examples.

As shown in FIGS. 1 and 2, the pipe fitting retainer A of the present invention includes a pair of locking bodies 20, each of which has approximately the same shape and is arranged in parallel to form an annular shape. Each locking body 20
A support ring IO having an annular shape that supports each locking body 20 so as to maintain an annular shape is provided.

Each locking body 20 is made of metal such as steel, stainless steel, brass, gunmetal, brass, etc., and one side in the axial direction has a peripheral surface portion 23 having a constant outer diameter in the axial direction. The other side portion has a taper 24 whose outer circumferential surface gradually decreases in diameter as it moves away from the circumferential surface portion 23.

A plurality of serrated protrusions 25 that are continuous along the axial direction are arranged on the inner circumferential side of each locking body 20 so as to protrude inwardly from the inner circumferential side. Each of the protrusions 25 is located on a tapered surface whose diameter gradually increases toward the inner side with respect to the axis of the cylindrical portion formed by each locking body 20 .

On the inner circumferential surface of the circumferential surface portion 23 of each locking body 20 having a constant outer diameter, a supporting ring groove 21 extending in the circumferential direction is disposed over the entire inner circumferential surface. Each support ring groove 21 in each locking body 20 has a protrusion 25 provided on the end surface on the peripheral surface 23 side of each locking body 20 and a protrusion 25 on the inner side adjacent to the protrusion 25. They are respectively provided at positions on the inner circumferential surface adjacent to the inner protrusion 25 between them. When both engaging members 20 are arranged side by side in an annular shape, both supporting recesses f121 are continuous in the circumferential direction. Each support ring concave groove 21 has a trapezoidal cross section, with the opening becoming narrower and gradually tapering toward the inner side.

An elastic ring concave groove 22 is formed in the axial center of the outer peripheral surface of the tapered portion 24 of each locking body 20 .

Recessed groove 22 for each elastic ring in each locking body 20
are disposed at equal positions on each locking body 20, and when both locking bodies 20 are arranged side by side in an annular shape, they are continuous in the circumferential direction.

Support ring groove 2 provided on the inner peripheral surface of each locking body 20
1, the negative support ring IO is in the concave groove 2 for both support rings.
They are slidably fitted over a distance of 1.

The support ring 10 is made of metal, hard plastic, fluororesin, rubber, etc., and is partially divided in the circumferential direction by a notch 11, so that the diameter can be contracted or expanded. When the support ring 10 is not contracted or expanded, it maintains the locking bodies 20 arranged side by side in an annular manner at appropriate intervals. If the cross-sectional shape of the support ring 10 is substantially the same trapezoidal cross-sectional shape as the cross-sectional shape of the support ring recess 21, each locking body 20 can be reliably held in an annular shape by the support ring 10. If the support ring 10 is made of a material that is difficult to deform, it will have a cross-sectional shape that can be easily deformed, for example, a V-shaped cross section.

Recessed groove 2 for elastic ring provided on the outer peripheral surface of each locking body 20
2, - number of elastic rings 60 are fitted between both elastic ring concave grooves 22. The elastic ring 60
is constructed so as to be continuous in the circumferential direction using a stretchable elastic body such as rubber.

The retainer A of the present invention having such a configuration is shown in FIG. 3(a).
), the socket 50 to be connected is inserted into the cylindrical socket 40 for use.

The receptacle 40 has an opening 41 at one end into which the insertion port 50 is inserted, and an annular sealing member groove 42 is disposed around the entire circumference on the inner peripheral surface near the opening 41. .

A seal member 30 made of, for example, rubber is fitted in the seal member groove 42 in a liquid-tight manner, and the receptacle 40
When the insertion opening 50 is inserted inside, the sealing member 30 is fitted onto the insertion opening 50 and is brought into close contact with the outer peripheral surface of the insertion opening 50 in a fluid-tight manner.

A recess 43 for a retainer is provided on the inner circumferential surface of the socket 40 on the inner side of the groove 42 for a seal member, and a retainer of the present invention is inserted into the recess 43 for a retainer. A is fitted and installed. The retainer recess 43 has a tapered surface 43 whose diameter decreases as the inner circumferential surface of the side of the socket 40 on the opening 41 side approaches the opening 41.
It is a. The angle of inclination of the tapered surface 43a with respect to the axis is smaller than the angle of inclination of the outer peripheral surface of the tapered portion 24 of each locking body 20 in the retainer A with respect to the axis. The inner circumferential surface of the side part on the inner back side connected to the tapered surface 43a is a circumferential surface 43 that is substantially parallel to the axis of the socket 40.
It has become b.

The inner diameter of the circumferential surface 43b is such that when the annular portion formed by each of the locking bodies 20 in the stopper A is expanded in diameter by inserting the insertion port 50, It is slightly larger than the outer diameter of the peripheral surface portion 23 at 20. The inner side surface 43c of the retainer recess 43 connected to the circumferential surface 43b is slightly inclined with respect to the plane orthogonal to the axis so that the axis side is located on the inner side of the socket 40. are doing.

In the pipe joint having such a configuration, when inserting the insertion port 50, it is necessary to insert the
For example, a rubber seal member 30 is fitted, and the retainer A of the present invention is installed in the retainer recess 43 so that the support ring IO is located on the inner side. The retainer A has the locking bodies 20 arranged side by side in an annular shape at appropriate intervals without touching each other.
Since it is supported by the support ring 10 fitted in the support ring groove 21 provided on the inner peripheral surface of the socket, the annular portion formed by each locking body 20 is reduced in diameter. 40
It is easily inserted through the opening 41 of the retainer recess 4.
It can be fitted within 3. The retainer A installed in the socket 40 is inserted into the opening 41 in each locking body 20.
The inner diameter formed by the protrusion 25 on the side inner circumference, that is,
The minimum inner diameter of the annular portion formed by each locking body 20 is the minimum inner diameter of the annular portion formed by each locking body 20 when the insertion hole inserted into the locking body 20 is It is slightly smaller than the outer diameter of 50.

At this time, the inner diameter formed by the protrusion 25 on the inner periphery of the back side of the retainer A is the same as that of each locking body 20 when the annular portion formed by each locking body 20 is not contracted or expanded in diameter. The outer diameter is approximately equal to or slightly larger than the outer diameter of the insertion port 50 inserted into the socket.

In this state, when the end of the insertion port 50 is inserted through the opening 41 of the socket 40, the end of the insertion port 50 will fit into the seal member 30 and then enter the retainer A. try to. At this time, the minimum inner diameter of the stopper A is
Because it is slightly smaller than the outer diameter of the insertion port 50,
The entire stopper A is moved inside the retainer recess 43 to the innermost side of the receiving opening 40 by the tip surface of the insertion opening 50,
The retainer A is pressed against the inner side surface 43c of the retainer recess 43.

The outer circumferential surface of the distal end of the socket 50 has a tapered shape that gradually decreases in diameter as it approaches the distal end, and in this state, when the socket 50 is further inserted into the socket 40, the socket The tapered portion of the outer periphery of the distal end portion 50 attempts to enter the annular portion formed by each locking body 20 in the retainer A. At this time, each locking body 2
0, an elastic ring 60 that easily expands in diameter is fitted on the side where the insertion opening 50 is inserted.
enters into each locking body 20 while expanding the diameter of each locking body 20. Each locking body 20 is divided into parts, and furthermore,
Since they are slidably supported by the support ring 10 so that they can be moved toward and away from each other, the annular portion formed by each locking body 20 can be easily expanded in diameter by the end of the insertion port 50. The insertion port 50 is easily inserted into the annular portion formed by each locking body 20. At this time, the support ring 10 that supports each locking body 20 in the retainer A is slidably fitted into the support ring groove 21 on the inner peripheral surface of each locking body 20, and 50 is inserted into each locking body 20,
The elastic ring 60 is expanded in diameter and tilted with respect to the axis. If the protrusion 25 on the inner periphery on the back side of each locking body 20 is smaller than the outer diameter of the insertion port 50, as the insertion port 50 is inserted, each locking body 20 is pushed and expanded, and the support ring 10 slides within the support ring concave groove 21 and is smoothly enlarged in diameter.

The inner diameter formed by the protrusion 25 on the inner periphery of the opening 41 side of each locking body 20 is larger than the outer diameter of the insertion port 50 inserted into each locking body 20 when the diameter is not contracted or expanded. Since the protrusion 25 is slightly smaller and the elastic ring 60 is fitted, the protrusion 25 is locked to the outer peripheral surface of the socket 50 when the socket 50 is inserted. Further, a support ring 10 is fitted to the inner circumferential surface of the inner inner part of each locking body 20, and the diameter of the support ring io is set to the inner circumferential surface of the inner inner part of each locking body 20. It is preferable to prevent the protrusion 25 from coming into contact with the outer circumferential surface of the socket 50 into which the socket 50 is inserted, since the insertion force when inserting the socket 50 is reduced.

When the insertion port 50 is inserted into the retainer A, the outer peripheral surface of the circumferential surface portion 23 of each locking body 20 has a slight gap from the circumferential surface 43b of the retainer recess 43. There is.

In this way, the end of the socket 50 is inserted into the socket 40 to a predetermined length, and clean water or the like is allowed to flow therethrough. As a result, the insertion port 50 moves in the direction in which it comes out of the socket 40. As the insertion port 50 moves, the insertion port 5
A retaining tool A externally fitted on the insertion port 50 moves integrally with the insertion port 50. At this time, the inclination angle of the tapered surface 43a of the retainer recess 43 with respect to the axis is smaller than the inclination angle of the outer peripheral surface of the tapered portion 24 of each locking body 20 in the retainer A with respect to the axis. Therefore, each locking body 2
The boundary between the outer circumferential surface of the tapered part 24 and the outer circumferential surface of the peripheral surface part 23 at 0 is a recess for a retainer, and the tapered surface 43a of the part 43
When the internal pressure of the pipe increases and the insertion port 50 moves in the direction in which it comes out of the socket 40, the stopper A moves in the direction shown by arrow B in FIG. 3(b) centering on the boundary. As it rotates, each protrusion 25 bites into the outer circumferential surface of the insertion port 50 and exhibits a slip-out prevention function. At the same time, the retainer A
A diameter reducing force acts on each of the locking bodies 20 so that the locking bodies 20 approach each other along the support ring 10, and the annular portion formed by each of the locking bodies 20 is reduced in diameter. Ru.

At this time, each locking body 20 is subjected to a strong tensile force at each end in the circumferential direction, so the diameter reducing force acting on each end is large.
Each end portion firmly bites into the outer circumferential surface of the insertion port 50, and each locking body 20 is firmly locked at opposing positions in the circumferential direction of the insertion port 50.

When water pressure is further applied to the insertion port 50 and the insertion port 50 attempts to come out from the socket 40, the entire outer peripheral surface of the tapered portion 24 on the opening 41 side on the outer peripheral surface of each locking body 20 of the retainer A is prevented from coming out. Tapered surface 4 in tool recess 43
3a, each locking body 20 contracts in diameter due to the diameter-reducing force from the tapered surface of the retainer recess 43;
Each locking body 20 is not rotated, and excessive locking of the outer peripheral surface of the insertion port 50 by each locking body 20 is suppressed.

The thickness, width, material, etc. of the support ring 10 are as follows:
When the socket 50 is inserted into each locking body 20 supported by the locking body 20, each locking body 20 is pressed against the end face of the socket 50 and detached from the support ring 10, and is pushed independently to the inner side. It can be supported to prevent it from being moved to the
Each locking body 20 is appropriately selected so as to be locked with a predetermined locking force in the inserted insertion port 50 at the beginning of insertion. The support ring concave groove 21 of each locking body 20 into which the support ring 10 is fitted has a narrow opening and is gradually tapered toward the innermost side. The support ring 10 fitted into the groove 21 is reliably supported and prevented from coming off while fully fitted into the support ring concave groove 21.

If the diameter of the insertion port 50 is small and the locking force of each locking body 20 at the time of insertion of the insertion port 50 may be small, it is not necessary to use the elastic ring 60 in the above embodiment, and it is possible to use only the support ring 10. A structure may be adopted in which each locking body 20 is supported.

In the above embodiment, a pair of locking bodies 20 are used, but the locking bodies 20 do not need to be one pair. For example, three or four locking bodies are held in an annular shape by the support ring 10. It is also possible to have a configuration in which Further, the support ring IO is not limited to a structure in which the parts other than the notch 11 at one location are continuous, and for example, the support ring lO is not limited to a structure in which the parts other than the notch 11 at one location are continuous. It may be constructed from a large number of arcuate members.

(Effects of the Invention) As described above, in the pipe fitting retainer of the present invention, each of the locking bodies is disposed side by side in an annular manner so as to be movable in the circumferential direction. The insertion port can be easily inserted into the annular portion. In addition, by reducing the diameter of the annular portion formed by each locking body, each locking body has its circumferential end firmly locked to the circumferential surface of the insertion opening, so each locking body The locking force applied by the body to the circumferential surface of the socket can be divided and applied in the circumferential direction of the socket, and there is no risk that the locking force will be concentrated on a part of the socket. The insertion port is securely prevented from coming off from the socket without being damaged. A groove is formed on the inner peripheral surface of each locking body, and each locking body is supported by a ring fitted into each groove. The locking force applied to the socket by the locking body can be changed, and a locking force corresponding to the shape of the socket can be easily obtained. Since each locking body can have the same shape, it is easy to manufacture and economical efficiency is also improved.

4. No, no! ■ Figure 1 is a partially cutaway side view showing an example of the retainer for pipe fittings of the present invention, Figure 2 is a cross-sectional view taken along line nn in Figure 1, and Figure 3 (a) is the retainer. Fig. 3(b) is a partially cutaway cross-sectional view showing a state in which the fitting of a pipe fitting using a fitting is inserted halfway into the socket. It is a partially cutaway cross-sectional view of a state in which the locking body is in contact with the tapered surface of the recess for the retaining tool due to a withdrawal force acting on the opening.

A... Retainer, 10... Support ring, 11...
- Notch, 20... Locking body, 21... Concave groove for support ring, 22... Concave groove for elastic ring, 23... Peripheral surface part, 24... Part of taper, 25...・Protrusion, 40...
Receptacle, 41... Opening, 43... Recess for retainer, 43a... Tapered surface, 50... Insertion port, 60
...Elastic ring.

that's all

Claims (1)

[Claims] 1. A tube that is installed in a receptacle into which a socket to be connected is inserted, and that locks onto the circumferential surface of the socket inserted into the socket to prevent the socket from coming out from the socket. These fittings are retainers for fittings, and are arranged in an annular shape at appropriate intervals so as to be able to lock onto the circumferential surface of the socket inserted into the socket. A plurality of locking bodies each having grooves continuous in the circumferential direction are arranged on the circumferential surface, and each locking body is fitted into the groove of each locking body in order to maintain a state in which the locking bodies are arranged side by side in an annular shape. A retainer for pipe fittings, comprising a fitted ring and.