JP2020197286A - Joint - Google Patents

Abstract

To provide a joint which can easily release the engagement of a pipe and a lock ring.SOLUTION: A joint comprises a conversion part located between its internal peripheral face and an external peripheral face of a pipe with respect to a joint main body 2, and on the same axial line as the joint main body 2, and converting relative rotation to relative rotation in a direction in which an axial line of a releaser 15 with respect to the joint main body 2 extends when relatively rotating the releaser 15 for releasing the engagement by being pushed into the joint main body 2 along the axial line around the axial line. The conversion part has a cam groove 24 which is formed so as to extend while inclining to an external peripheral face of the releaser 15 with respect to the axial line, and a protrusion 34 formed at the internal peripheral face of the joint main body 2, and inserted into the cam groove 24. Non-conversion parts 16a, 37a for regulating relative movement progressing toward the joint main body 2 along the axial line of the releaser 15 when the releaser 15 separates from the joint main body 2 along the axial line with respect to a position in which the engagement is released are arranged in positions apart from the cam groove 24.SELECTED DRAWING: Figure 16

Description

The present invention relates to a joint.

Conventionally, it has been known to provide a joint for connecting or disconnecting a pipe through which a liquid flows to the pipe for the purpose of inspecting a fluid leak in the pipe.
As shown in Patent Document 1, such a joint includes a joint body into which a pipe is inserted, and a lock inside the joint body that prevents the pipe from coming off from the joint body by engaging with the pipe. A ring is provided. Further, the joint is located between the inner peripheral surface of the joint body and the outer peripheral surface of the pipe inserted into the joint body and on the same axis as the joint body and the lock ring. A releaser is provided to release the engagement between the lock ring and the pipe by being pushed into the joint body along the axis.

In the above joint, when the pipe is inserted into the joint body, the lock ring in the joint body engages with the pipe, thereby preventing the pipe from coming out of the joint body. Then, when the pipe is pulled out from the joint body, the engagement between the pipe and the lock ring is released by pushing the releaser into the joint body. This makes it possible to pull out the pipe from the joint body.

Japanese Patent No. 4565776

However, in the above joint, since the releaser is located between the inner peripheral surface of the joint body and the outer peripheral surface of the pipe inserted into the joint body, the engagement between the pipe and the lock ring is to be released. When pushing the releaser into the joint body, it is difficult to apply a force in the pushing direction to the releaser. Therefore, there is room for further improvement in facilitating the disengagement of the pipe and the lock ring.

An object of the present invention is to provide a joint that can easily disengage a pipe from a lock ring.

Hereinafter, means for solving the above problems and their actions and effects will be described.
The joint that solves the above problems includes a joint body into which the pipe is inserted, and a lock ring that is provided in the joint body and prevents the pipe from coming off from the joint body by engaging with the pipe. The joint also includes the following releaser. This releaser is located between the inner peripheral surface of the joint body and the outer peripheral surface of the pipe inserted into the joint body and on the same axis as the joint body and the lock ring, and is located on the same axis. The lock ring and the pipe are disengaged by being pushed into the joint body along the line. Further, the joint includes a conversion unit that, when the releaser is rotated relative to the joint body around the axis, converts the relative rotation into a relative movement of the releaser in the extending direction of the axis with respect to the joint body. The conversion portion includes a cam groove formed on one of the inner peripheral surface of the joint body and the outer peripheral surface of the releaser so as to extend at an angle with respect to the axis, and the inner peripheral surface of the joint body and the releaser. A protrusion formed on the other side of the outer peripheral surface of the cam groove and inserted into the cam groove is provided. Further, in the above joint, when the releaser is separated from the joint body along the axis with respect to the position where the lock ring and the pipe are disengaged, the relative movement of the releaser toward the joint body along the axis is restricted. The non-conversion unit is provided at a position away from the cam groove of the conversion unit.

According to the above configuration, when the pipe inserted into the joint body is disengaged from the lock ring of the joint body, a releaser located between the outer peripheral surface of the pipe and the inner peripheral surface of the joint body is formed. It is rotated around the axis of the joint body and lock ring. When the releaser is rotated in this way, the releaser moves in the direction of being pushed into the joint body along the above-mentioned axis through the cam groove in the conversion portion and the protrusion inserted into the cam groove, thereby locking the pipe and the lock. The engagement with the ring is released. Applying a force in the direction of rotation around the axis to the releaser can be performed relatively easily even when the releaser is located between the outer peripheral surface of the pipe and the inner peripheral surface of the joint body. it can. Therefore, by rotating the releaser around the axis, the rotational operation of the releaser is converted into a linear motion along the extending direction of the axis, and the engagement between the pipe and the lock ring is easily released through such a linear motion. can do.

Further, when the releaser is erroneously pushed in the direction of being pushed into the joint body along the axis while the lock ring and the pipe are engaged, the releaser is assumed to be pushed along the axis of the joint body. If it moves toward, the movement is performed with the rotation of the releaser around the axis through the cam groove in the conversion unit and the protrusion inserted into the cam groove. Then, due to the erroneous pushing of the releaser into the joint body, the releaser may release the engagement between the pipe and the lock ring. In order to suppress this, when the releaser is separated from the joint body along the axis with respect to the position where the lock ring and the pipe are disengaged, the relative movement of the releaser toward the joint body along the axis is restricted. It is conceivable to provide a non-conversion unit.

However, the following problems may further occur depending on the position where such a non-conversion portion is provided. That is, if the non-conversion portion is provided so as to be connected to the cam groove of the conversion portion, for example, the space around which the cam groove can be formed around the axis is inevitably reduced by the amount of the non-conversion portion. .. As a result, in order to secure the amount of movement of the releaser along the axis required as the releaser, the inclination angle of the cam groove must be made smaller than the axis. However, if the inclination angle of the cam groove with respect to the axis is reduced in this way, the torque required to rotate the releaser around the axis in order to disengage the pipe and the lock ring increases. There is a problem that it becomes difficult to release the engagement with the lock ring. According to the above configuration, since the non-engaging portion is provided at a position away from the cam groove of the conversion portion in the joint, the above-mentioned problem can be suppressed.

In the joint, the releaser is formed with a plurality of pressing pieces spaced apart from each other around the axis, and the portion between the pressing pieces is a slit extending along the axis. .. Further, it is considered that the cam groove is formed on the outer peripheral surface of the pressing piece, while the protrusion inserted into the cam groove is formed on the inner peripheral surface of the joint body.

According to this configuration, the portion where the cam groove can be formed is limited to the outer peripheral surface of the pressing piece located between the slits around the axis. Therefore, in order to secure the amount of movement of the releaser along the axis required as the releaser, the inclination angle of the cam groove with respect to the axis must be reduced, but the above-mentioned accompanying the setting of the inclination angle It is possible to suppress the occurrence of the problem.

Sectional drawing which shows the whole structure of a joint. A perspective view showing a releaser. Top view of the releaser as seen from above in FIG. Bottom view of the releaser as seen from below in FIG. A side view of the releaser as seen from the right side of FIG. A side view of the releaser as seen from the left side of FIG. Rear view of the releaser as seen from the back side of FIG. Front view of the releaser as seen from the front side of FIG. The perspective view which shows the cap. Top view of the releaser as seen from above in FIG. Bottom view of the releaser as seen from below in FIG. A side view of the releaser as seen from the left side of FIG. A side view of the releaser as seen from the right side of FIG. Front view of the releaser as seen from the front side of FIG. Rear view of the releaser as seen from the back side of FIG. The side view which shows the positional relationship of a cap and a releaser when the releaser is in the position which disengages the lock ring and a pipe. The side view which shows the positional relationship of a cap and a releaser when the relative movement toward a joint body in a releaser is regulated by a non-conversion part.

Hereinafter, one embodiment of the joint will be described with reference to FIGS. 1 to 17.
As shown in FIG. 1, the joint 1 includes a joint body 2 connected to a pressure pump or the like for a pressure resistance test (not shown). The joint body 2 is formed in a cylindrical shape, and an opening 2a on one end side (left end side in FIG. 1) of the joint body 2 is connected to the pipe. Further, a pipe 3 for flowing a fluid pressurized by the pressurizing pump is inserted from the opening 2b on the other end side (right end side in FIG. 1) of the joint body 2.

The joint body 2 includes a body member 4 having an opening 2a on one end side formed therein. A seal ring 6 extending in an annular shape along the inner peripheral surface of the body member 4 is held on the inner peripheral surface of the body member 4. Further, a cylindrical cap 7 is fixed to the outer peripheral surface of the joint body 2. The cap 7 is formed with an opening 2b on the other end side of the joint body 2. A step portion 8 is formed on the inner peripheral surface of the cap 7, and by forming the step portion 8, the inner peripheral surface of the cap 7 gradually expands as it approaches the body member 4.

The step portion 8 on the inner peripheral surface of the cap 7 is provided with a lock ring 10 extending in an annular shape along the inner peripheral surface thereof. The lock ring 10 comprises a holding ring 11 attached to the end of the enlarged diameter portion 5 of the body member 4 on the cap 7 side, and a pressing member 12 provided between the holding ring 11 and the stepped portion 8. It is fixed inside the joint body 2 by using. That is, the holding ring 11, the pressing member 12, and the lock ring 10 are sandwiched between the end of the enlarged diameter portion 5 on the cap 7 side and the stepped portion 8 on the inner peripheral surface of the cap 7. The lock ring 10 is fixed inside the joint body 2.

The lock ring 10 includes a flat plate portion 13 sandwiched between the pressing member 12 and the step portion 8, and a swash plate portion 14 extending from an end portion of the flat plate portion 13 on the axis L1 side. The swash plate portion 14 of the lock ring 10 is formed in an oblique shape that approaches the axis L1 toward the diameter-expanded portion 5 side (left side in the drawing).

Then, when the pipe 3 is inserted into the joint body 2 through the opening 2b, the pipe 3 passes through the inside of the swash plate portion 14 of the lock ring 10 and is inserted into the inner peripheral surface of the body member 4 of the joint body 2. Will be done. Under this state, the tip of the swash plate portion 14 of the lock ring 10 presses the outer peripheral surface of the pipe 3 toward the axis L1, so that the lock ring 10 engages with the pipe 3, and through the engagement, the joint body 2 The pipe 3 is prevented from coming out of the pipe 3.

Further, the joint 1 is provided between the inner peripheral surface of the joint body 2 (cap 7) and the outer peripheral surface of the pipe 3 inserted into the joint body 2 and with the joint body 2 (lock ring 10). A releaser 15 is provided which is located on the same axis L1 and is pushed into the joint body 2 along the axis L1 to release the engagement between the lock ring 10 and the pipe 3. The releaser 15 is formed in a cylindrical shape, and includes an operation portion 16 located outside the cap 7 and a push-in portion 17 inserted into the cap 7 via an opening 2b of the joint body 2. There is. The tip of the push-in portion 17 is in contact with the swash plate portion 14 of the lock ring 10. Further, the releaser 15 and the joint body 2 can rotate relative to each other about the axis L1.

When the pipe 3 is inserted into the joint body 2, the pipe 3 is in a state of penetrating the pushing portion 17 of the releaser 15. Under such a state, when the releaser 15 is pushed into the joint body 2 along the axis L1, the pushing portion 17 expands the swash plate portion 14 of the lock ring 10, in other words, in a direction away from the axis L1. Press to displace. As a result, the pressure of the tip of the swash plate portion 14 on the outer peripheral surface of the pipe 3 toward the axis L1 is weakened, and the engagement between the lock ring 10 and the pipe 3 is released. Therefore, the pipe 3 is pulled out from the joint body 2. It becomes possible.

By the way, in the joint 1, since the releaser 15 is located between the inner peripheral surface of the joint body 2 (cap 7) and the outer peripheral surface of the pipe 3 inserted into the joint body 2, the pipe 3 and the lock are locked. When the releaser 15 is pushed into the joint body 2 in order to disengage the ring 10, it is difficult to apply a force in the pushing direction to the releaser 15. Therefore, when the releaser 15 is relatively rotated around the axis L1 with respect to the joint body 2 (cap 7), the relative rotation is relative to the joint body 2 in the direction in which the axis L1 extends with respect to the joint body 2. A conversion unit is provided to convert to.

Applying a force in the direction of rotation around the axis L1 to the releaser 15 even under the condition that the releaser 15 is located between the outer peripheral surface of the pipe 3 and the inner peripheral surface of the joint body 2 (cap 7). , It can be done relatively easily. Therefore, by rotating the releaser 15 around the axis L1, the rotational operation of the releaser 15 is converted into a linear motion along the extending direction of the axis L1, and the engagement between the pipe 3 and the lock ring 10 is performed through such a linear motion. Can be easily released.

Next, the conversion unit of the joint 1 will be described in detail with reference to FIGS. 2 to 17.
Hereinafter, the clockwise direction when the tip side of the releaser 15 is viewed from the base end side (right side in FIG. 1) will be referred to as the first direction Y1, and the counterclockwise direction will be referred to as the second direction Y2.

In the conversion portion, a cam groove 24 formed on the outer peripheral surface of the releaser 15 so as to extend at an angle with respect to the axis L1 and an inner peripheral surface of the cap 7 are formed and inserted into the cam groove 24. The protrusion 34 is provided.

First, the releaser 15 will be described in detail with reference to FIGS. 2 to 8.
The releaser 15 has a pair of operating units 16 provided around the axis L1 at intervals.

A pair of connecting portions 21 for connecting the operating portions 16 are provided between the operating portions 16 around the axis L1.
The releaser 15 has a substantially cylindrical pushing portion 17 centered on the axis L1. The base end portion of the pushing portion 17 is connected to the connecting portion 21.

The push-in portion 17 is provided with a plurality of slits 22 extending along the axis L1 from the tip of the push-in portion 17 toward the base end side at intervals around the axis L1. In this embodiment, four slits 22 are provided around the axis L1 at equal intervals.

The push-in portion 17 is formed with a plurality of pressing pieces 23 spaced around the axis L1 by the plurality of slits 22. In this embodiment, four pressing pieces 23 are provided at equal intervals around the axis L1. In other words, the portion between the slits 22 is a pressing piece 23 extending along the axis L1. The outer peripheral surface of the tip of the pressing piece 23 is reduced in diameter toward the tip.

The pair of operating units 16 cover the pair of pressing pieces 23 facing each other with the axis L1 sandwiched between the four pressing pieces 23 from the outer peripheral side (see FIGS. 7 and 8). A gap is provided between the pair of pressing pieces 23 and each operation unit 16.

The cam groove 24 is provided on the outer peripheral surface of the pair of pressing pieces 23 that are not covered by the operation unit 16. The cam groove 24 extends so as to be located on the tip end side of the pressing piece 23 toward the front side in the second direction Y2. Both ends of the cam groove 24 in the extending direction have an arc shape. A locking convex portion 25 protruding in a substantially arc shape is provided on the front side portion of the second direction Y2 on one of the pair of inner side surfaces of the cam groove 24. In the present embodiment, the locking convex portion 25 is provided on the inner side surface located on the tip end side of the releaser 15.

A guide groove 26 extending along the axis L1 is provided on the outer peripheral surface of the pressing piece 23 at a portion closer to the tip end side than the cam groove 24.
A protruding portion 27 is provided on the outer peripheral surface of the pair of pressing pieces 23 covered by the operating portion 16 (see FIGS. 3 and 4).

A first mark 28a and a second mark 28b are provided on the outer peripheral surface of the connecting portion 21. The first mark 28a has an arrow shape toward both sides around the axis L1. The second mark 28b has an isosceles triangle shape having an apex on the distal end side and a base on the proximal end side of the releaser 15.

A plurality of ridges 29 extending along the axis L1 are provided on the outer peripheral surface of each operation unit 16 at intervals in the circumferential direction. Each ridge 29 has a non-slip function when the operator grips the operation unit 16.

Next, the cap 7 will be described in detail with reference to FIGS. 9 to 15.
The cap 7 has an extrapolated portion 31 into which the body member 4 is inserted, and a reduced diameter portion 32 of the extrapolated portion 31 located on the opposite side of the extrapolated portion 31 and having a diameter smaller than that of the extrapolated portion 31. doing.

On the inner peripheral surface of the reduced diameter portion 32, a pair of protrusions 34 accommodated in the pair of cam grooves 24 are provided at intervals in the circumferential direction (see FIGS. 14 and 15). The protrusion 34 has a flat columnar shape.

A pair of recesses 35 for accommodating a pair of protrusions 27 are provided on the inner peripheral surface of the reduced diameter portion 32 (see FIGS. 9 and 15). Further, a guide groove 36 extending from the recess 35 toward the opening 2b side along the axis L1 is provided on the inner peripheral surface of the reduced diameter portion 32. The guide groove 36 extends to the end surface of the cap 7 on the opening 2b side.

A plurality of ridges 39 extending along the axis L1 are provided on the outer peripheral surface of each extrapolation portion 31 at intervals in the circumferential direction. Each ridge 39 has a non-slip function when the operator grips the cap 7.

When the releaser 15 is pushed into the cap 7 along the axis L1, the relative movement of the protrusion 34 into the cam groove 24 and the relative movement of the protrusion 27 into the recess 35 are guided by the guide groove 36 and the guide groove 26, respectively. To. Then, the pushing portion 17 of the releaser 15 is located between the outer peripheral surface of the pipe 3 and the inner peripheral surface of the joint body 2 (cap 7).

When the engagement between the pipe 3 inserted in the cap 7 and the lock ring 10 is released, the releaser 15 is rotated in the second direction Y2 around the axis L1. As a result, the protrusions 34, both of which form the conversion unit, move relative to each other in the cam groove 24 in the first direction Y1.

As shown in FIG. 17, when the protrusion 34 moves to the rear end of the second direction Y2 of the cam groove 24, the releaser 15 moves in the direction of being pushed into the cap 7 along the axis L1 and thereby locks with the pipe 3. The engagement with the ring 10 is released.

At this time, the vertices of the isosceles triangle of the second mark 28b of the releaser 15 and the release position mark 38a formed on the outer peripheral surface of the cap 7 coincide with each other around the axis L1. The release position mark 38a of the present embodiment is a ridge extending along the axis L1.

By the way, when the releaser 15 is erroneously pushed in the direction of being pushed into the cap 7 along the axis L1 under the state where the lock ring 10 and the pipe 3 are engaged, the releaser is temporarily pushed along the axis L1. Assuming that the 15 moves toward the cap 7, the movement is performed with the rotation of the releaser 15 through the cam groove 24 and the protrusion 34 inserted into the cam groove 24. Then, when the releaser 15 is erroneously pushed into the cap 7, the releaser 15 may release the engagement between the pipe 3 and the lock ring 10. In order to suppress this, when the releaser 15 is separated from the cap 7 along the axis L1 with respect to the position where the lock ring 10 and the pipe 3 are disengaged, the releaser 15 is directed toward the cap 7 along the axis L1 of the releaser 15. It is conceivable to provide a non-conversion unit that regulates relative movement.

However, the following problems may further occur depending on the position where such a non-conversion portion is provided. That is, if the non-conversion portion is provided so as to be connected to the cam groove 24 of the conversion portion, for example, the space around the axis L1 where the cam groove 24 can be formed is prevented from becoming smaller by the amount of the non-conversion portion. I can't. In particular, according to the configuration of the present embodiment, the portion where the cam groove 24 can be formed is limited to the outer peripheral surface of the pressing piece 23 located between the slits 22 around the axis L1. As a result, in order to secure the amount of movement of the releaser 15 along the axis L1 required as the releaser 15, the inclination angle of the cam groove 24 must be smaller than that of the axis L1. However, if the inclination angle of the cam groove 24 with respect to the axis L1 is reduced in this way, the torque required to rotate the releaser 15 in order to disengage the pipe 3 and the lock ring 10 increases, so that the pipe 3 and the pipe 3 are used. There is a problem that it becomes difficult to release the engagement with the lock ring 10.

Therefore, in the present embodiment, the non-conversion unit is provided at a position away from the cam groove 24 of the conversion unit.
The non-converting portion is provided with a tip surface 16a of the operation portion 16 of the releaser 15 and a regulation protrusion 37 formed on the outer peripheral surface of the cap 7 and in contact with the tip surface 16a.

Next, the non-conversion unit will be described in detail.
On the outer peripheral surface of the reduced diameter portion 32, a plurality of regulating protrusions 37 are provided at intervals around the axis L1. In the present embodiment, a pair of regulation protrusions 37 are provided around the axis L1 at equal intervals.

The regulation protrusion 37 projects from the end of the extrapolation portion 31 on the reduced diameter portion 32 side toward the opening 2b. The regulation protrusion 37 has a tip surface 37a and an inclined surface 37b that is inclined so as to be located closer to the opening 2b toward the front side in the first direction Y1 and is connected to the tip surface 37a of the regulation protrusion 37.

When the releaser 15 is rotated in the first direction Y1, the protrusions 34 that together form the conversion unit move relative to each other in the cam groove 24 in the second direction Y2. At this time, the tip surface 16a of the operation portion 16 of the releaser 15 is guided along the inclined surface 37b of the regulation protrusion 37.

As shown in FIG. 16, when the protrusion 34 gets over the locking convex portion 25 and moves toward the front end of the cam groove 24 in the second direction Y2, the tip surface 16a of the operation portion 16 immediately before reaching the front end of the cam groove 24 It begins to come into contact with the tip surface 37a of the regulation protrusion 37. Further, when the protrusion 34 reaches the front end of the cam groove 24 in the second direction Y2, the tip surface 16a of the operation portion 16 completely abuts on the tip surface 37a of the regulation protrusion 37. As a result, the releaser 15 is separated from the cap 7 along the axis L1 with respect to the position where the lock ring 10 and the pipe 3 are disengaged. At this time, the same state is maintained by locking the protrusion 34 to the locking protrusion 25. Further, when the tip surface 37a of the regulation protrusion 37 and the tip surface 16a of the operation portion 16 come into contact with each other, the relative movement of the releaser 15 toward the cap 7 along the axis L1 is restricted.

At this time, the vertices of the isosceles triangle of the second mark 28b of the releaser 15 and the regulation position mark 38b formed on the outer peripheral surface of the cap 7 coincide with each other around the axis L1. The regulation position mark 38b of the present embodiment is a ridge extending along the axis L1.

According to the present embodiment described in detail above, the following effects can be obtained.
(1) When the releaser 15 is rotated relative to the joint body 2 (cap 7) around the axis L1, the relative rotation is relative to the joint body 2 in the direction in which the axis L1 extends with respect to the joint body 2. A conversion unit is provided to convert to.

Applying a force in the direction of rotation around the axis L1 to the releaser 15 even under the condition that the releaser 15 is located between the outer peripheral surface of the pipe 3 and the inner peripheral surface of the joint body 2 (cap 7). , It can be done relatively easily. Therefore, by rotating the releaser 15 around the axis L1, the rotational operation of the releaser 15 is converted into a linear motion along the extending direction of the axis L1, and the engagement between the pipe 3 and the lock ring 10 is performed through such a linear motion. Can be easily released.

(2) Restricts the relative movement of the releaser 15 toward the cap 7 along the axis L1 when the releaser 15 is separated from the cap 7 along the axis L1 with respect to the position where the lock ring 10 and the pipe 3 are disengaged. A non-conversion unit is provided.

When the releaser 15 is erroneously pushed in the direction of being pushed into the cap 7 along the axis L1 while the lock ring 10 and the pipe 3 are engaged, the releaser 15 is capped along the axis L1. Since the movement toward the 7 is restricted, the erroneous pushing of the releaser 15 into the cap 7 is suppressed. As a result, it is possible to suppress the occurrence of a problem that the releaser 15 disengages the pipe 3 from the lock ring 10.

(3) The non-engaging portion is provided at a position away from the cam groove 24 of the conversion portion in the joint 1.
Therefore, it is possible to prevent the space around the axis L1 where the cam groove 24 can be formed from becoming smaller by providing the non-conversion portion. As a result, in order to secure the amount of movement of the releaser 15 along the axis L1 required as the releaser 15, it is possible to suppress the occurrence of inconvenience such that the inclination angle of the cam groove 24 must be smaller than that of the axis L1. Therefore, by reducing the inclination angle of the cam groove 24 with respect to the axis L1, it is possible to suppress an increase in torque required when rotating the releaser 15 in order to disengage the pipe 3 and the lock ring 10, and the pipe 3 can be prevented from increasing. It is possible to suppress the occurrence of a problem that it becomes difficult to disengage the lock ring 10.

(4) When the releaser 15 is pushed into the cap 7 along the axis L1, the relative movement of the protrusion 34 into the cam groove 24 and the relative movement of the protrusion 27 into the recess 35 are caused by the guide groove 36 and the guide groove 26. Each will be guided. As a result, the releaser 15 can be easily pushed into the cap 7.

(5) A protrusion 34 is locked on the inner surface of the cam groove 24 in a state where the releaser 15 is separated from the cap 7 along the axis L1 with respect to the position where the lock ring 10 and the pipe 3 are disengaged. A locking protrusion 25 is provided. Since the above state is maintained by locking the protrusion 34 to the locking protrusion 25, the releaser 15 moves along the axis L1 under the state where the lock ring 10 and the pipe 3 are engaged. When the releaser 15 is erroneously pushed in the direction of being pushed into the cap 7, the releaser 15 can be more reliably restricted from moving toward the cap 7 along the axis L1.

The above embodiment can be changed as follows, for example. The above embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
-The ridge 29 provided on the releaser 15 can be omitted. Further, the ridge 39 of the cap 7 can be omitted.

-The shapes of the first mark 28a and the second mark 28b of the releaser 15 can be changed as appropriate. Further, the shapes of the release position mark 38a and the regulation position mark 38b of the cap 7 can be changed as appropriate.

-The first mark 28a of the releaser 15 can be omitted. Further, the first mark 28a of the releaser 15 can be omitted.
The pushing portion 17 of the releaser 15 is not limited to the one having four slits 22 and four pressing pieces 23, and the number of slits 22 and pressing pieces 23 can be arbitrarily changed.

-It is also possible to omit the inclined surface 37b of the regulation protrusion 37.
-The cap 7 is not limited to the one having a pair of regulation protrusions 37, and the number of regulation protrusions 37 can be changed to three or four. Also in this case, three or four regulation protrusions 37 may be provided around the axis L1 at equal intervals.

-Instead of or in addition to the locking convex portion 25, the locking convex portion 25 may be provided on the inner side surface located on the proximal end side of the releaser 15. Further, the locking convex portion 25 can be omitted.
-The guide groove 26 of the releaser 15 can be omitted. Further, the guide groove 36 of the cap 7 can be omitted.

-The protruding portion 27 of the releaser 15 can be omitted. In this case, the recess 35 and the guide groove 36 of the cap 7 may be omitted.
The cam groove 24 can be formed on the inner peripheral surface of the cap 7, and the protrusion 34 can be provided on the outer peripheral surface of the pressing piece 23.

The pushing portion 17 of the releaser 15 may not have the slit 22.

1 ... Joint, 2 ... Joint body, 2a ... Opening, 2b ... Opening, 3 ... Pipe, 4 ... Body member, 5 ... Diameter expansion part, 6 ... Seal ring, 7 ... Cap, 8 ... Step part, 10 ... Lock ring, 11 ... Holding ring, 12 ... Pressing member, 13 ... Flat plate part, 14 ... Slanted plate part, 15 ... Releaser, 16 ... Operation part, 17 ... Pushing part, 21 ... Connecting part, 22 ... Slit, 23 ... Pressing One piece, 24 ... cam groove, 25 ... locking convex part, 26 ... guide groove, 27 ... protruding part, 28a ... first mark, 28b ... second mark, 29 ... ridge, 31 ... extrapolation part, 32 ... contraction Diameter, 34 ... protrusion, 35 ... recess, 36 ... guide groove, 37 ... regulation protrusion, 37a ... tip surface, 37b ... inclined surface, 38a ... release position mark, 38b ... regulation position mark, 39 ... protrusion.

Claims (2)

The fitting body into which the pipe is inserted and
A lock ring provided in the joint body to prevent the pipe from coming out of the joint body by engaging with the pipe.
It is located between the inner peripheral surface of the joint body and the outer peripheral surface of the pipe inserted into the joint body and on the same axis as the joint body and the lock ring, and is located along the axis. In a joint comprising a releaser that disengages the lock ring from the pipe by being pushed into the joint body.
When the releaser is rotated relative to the joint body around the axis, the releaser is provided with a conversion unit that converts the relative rotation into relative movement in the direction in which the axis extends with respect to the joint body in the releaser.
The conversion portion includes a cam groove formed on one of the inner peripheral surface of the joint body and the outer peripheral surface of the releaser so as to extend at an angle with respect to the axis, and the inner circumference of the joint body. A protrusion formed on the other side of the surface and the outer peripheral surface of the releaser and inserted into the cam groove is provided.
When the releaser is separated from the joint body along the axis with respect to the position where the lock ring and the pipe are disengaged, the relative movement of the releaser toward the joint body along the axis is restricted. A joint characterized in that the non-converting portion is provided at a position away from the cam groove of the converting portion. The releaser is formed with a plurality of pressing pieces spaced around the axis, and the portion between the pressing pieces is a slit extending along the axis.
The joint according to claim 1, wherein the cam groove is formed on the outer peripheral surface of the pressing piece, while the protrusion inserted into the cam groove is formed on the inner peripheral surface of the joint body.