JPH0653894U - Pipe fitting - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose is to further reduce the size of a pipe joint for connecting a pipe body to a connection port of a cylinder, a valve, or the like. [Structure] The seal ring 3 is provided in the mounting recess 2 of the pipe joint body 1.
Is inserted, and an annular chuck 4 that locks the tubular body 7 with the claw portion 4a is attached downstream. A guide tube 5 is fitted into the pipe joint body 1, and a plurality of locking projections 5 are provided on the inner peripheral surface thereof.
a is formed. A plurality of locking windows 6a into which the locking projections 5a are fitted are formed in the middle portion of the outer peripheral surface of the release cylinder 6. Therefore, the release cylinder 6 can move in the direction of the axis L of the tube locking body 1. Further, the contact between the window frame 6c of the locking window 6a and the lower surface portion 5c of the locking projection 5a prevents the release cylinder 6 from coming out of the pipe joint body 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe joint for connecting a pipe body for supplying a fluid such as gas or liquid to a connection port such as a cylinder or a valve.

[0002]

[Prior art]

 BACKGROUND ART Conventionally, a pipe joint in which a seal ring, an annular chuck, a guide cylinder, and a release cylinder are sequentially arranged inside the pipe joint main body from the inner side toward the downstream side (inlet side) is already known.

As shown in FIG. 7, the tubular pipe joint body 21 of the above-mentioned known pipe joint is screwed into a connection port of a cylinder, a valve or the like. A seal ring 23 is fitted in the large-diameter portion 22a of the mounting recess 22 on the inlet side of the pipe joint body 21.

An annular chuck 24 having elasticity is mounted on the downstream side of the seal ring 23. The tip of the annular chuck 24 once extends to the downstream side and is then bent and inverted to the upstream side. A plurality of claws 24a are circumferentially arranged and formed at the tip of the annular chuck 24, and the claws 24a lock the outer peripheral surface of the pipe body 27 inserted into the pipe joint body 21.

A guide cylinder 25 is non-slideably fitted in an opening on the downstream side of the pipe joint body 21. The guide cylinder 25 is formed in a hollow cylindrical shape, and a stepped portion 25a is formed at its entrance so as to expand its diameter.

A hollow cylindrical release cylinder 26 is inserted into the guide cylinder 25 so as to be movable in the direction of the axis L of the pipe joint body 21. An inclined surface 26a is formed at the tip of the release cylinder 26, and the inward movement of the release cylinder 26 causes the inclined surface 26a to expand the claw portion 24a of the annular chuck 24. A step 26b is formed on the downstream side of the slope 26a in the release cylinder 26, and the step 26b forms an annular bulge 26c together with the slope 26a. The step portion 26b cooperates with the step portion 25a of the guide tube 25 to prevent the release tube 26 from slipping out of the pipe joint body 21.

[0007]

[Problems to be solved by the device]

 However, due to the recent trend toward smaller and lighter industrial equipment, fluid pressure equipment is also being downsized, and therefore, pipe fittings are required to be further miniaturized, even if only slightly.

However, in the above-mentioned conventional pipe joint, since the stepped portion 26b is formed on the outer peripheral surface of the distal end portion of the release cylinder 26 to prevent the release cylinder 26 from coming out of the pipe joint body 21, The tip portion becomes the large-diameter enlarged portion 26c. Therefore, the diameter of the distal end portion of the guide cylinder 25 that movably accommodates the enlarged portion 26c and the diameter of the pipe joint body 21 are increased by the enlarged portion 26c, which causes a problem in downsizing the pipe joint. It was

The present invention has been made to solve the above problems, and an object thereof is to reduce the size of one layer of a pipe joint.

[0010]

[Means for Solving the Problems]

 In order to achieve the above object, in the present invention, a mounting recess provided at the inlet of the tubular pipe joint body and an outer periphery of the pipe body disposed in the mounting recess and inserted from the downstream side of the pipe joint body are provided. A seal ring for sealing, a locking member disposed on the downstream side of the seal ring and locking the inserted pipe body, and a downstream side of the locking member so as to penetrate the pipe body. A pipe joint that is provided so as to be movable in the axial direction of the pipe joint body and that includes a release tube that releases the lock between the lock member and the pipe body by expanding the diameter of the lock member, A plurality of locking projections are provided on the inner peripheral part of the mounting recess, and the locking projections are fitted to the middle part of the outer peripheral surface of the release cylinder, and the release cylinder is guided in the axial direction of the pipe joint body. A plurality of locking recesses are provided.

Further, in the second invention, the locking recess is a locking window which is provided through the release cylinder. Further, in the third invention, the release cylinder is made of plastic.

[0012]

[Action]

 According to the above configuration, when the release cylinder is fitted into the mounting recess of the pipe joint body and the locking projection is locked in the locking recess of the release cylinder, the release cylinder will fall within the range of the locking recess and the axis line of the pipe joint body. It becomes possible to move in the direction. Further, when the locking projection comes into contact with the outer end of the locking recess, the movement of the release tube is restricted, and the release tube is prevented from slipping out of the pipe joint body.

[0013]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, the tubular pipe joint body 1 is adapted to be screwed into a connection port such as a cylinder or a valve. A seal ring 3 is fitted in the large diameter portion 2a of the mounting recess 2 on the inlet side of the pipe joint body 1.

An annular chuck 4 as a locking member is mounted on the downstream side of the seal ring 3. The annular chuck 4 has elasticity, and its tip once extends downstream and is then bent and inverted upstream. A plurality of claws 4a are circumferentially arranged at the tip of the annular chuck 4, and the claws 4a lock the outer peripheral surface of the pipe body 7 inserted into the pipe joint body 1.

A guide cylinder 5 is non-slideably fitted into an opening on the downstream side of the pipe joint body 1. As shown in FIGS. 2 to 4, the guide cylinder 5 is formed in a hollow cylindrical shape, and a plurality of (four in this embodiment) locking projections 5a as locking projections are formed on the inner peripheral surface of the inlet thereof. The grooves 5b are alternately formed at equal intervals. The inner diameter of these locking projections 5a is set to be slightly larger than the outer diameter of the tubular body 7.

A release cylinder 6 made of plastic is inserted into the guide cylinder 5 so as to be movable in the direction of the axis L of the pipe joint body 1. As shown in FIGS. 5 and 6, the release cylinder 6 is formed in a hollow cylindrical shape, and its inner diameter is set to be substantially equal to the inner diameter of the locking projection 5a. A plurality of (four in this embodiment) locking windows 6a as locking recesses corresponding to the locking projections 5a of the guide cylinder 5 are provided in the middle of the outer peripheral surface of the release cylinder 6. It is hollowed out at intervals. A support portion 6b is formed between the locking windows 6a. Each locking window 6a is formed in a rectangular frame shape of the same size and size, and its lateral width is set to be slightly larger than the lateral width of the locking projection 5a. Therefore, the lateral width of each support portion 6b is set to be slightly smaller than the lateral width of the groove 5b.

Then, by inserting the release cylinder 6 into the guide cylinder 5 in a state where the respective locking windows 6a of the release cylinder 6 and the respective locking projections 5a of the guide cylinder 5 are made to correspond to each other, The locking projections 5a are fitted in the 6a, and the supporting portions 6b are fitted in the grooves 5b. As a result, the release cylinder 6 becomes movable in the direction of the axis L of the pipe locking body 1. Further, the contact between the window frame 6c on the front end side of each locking window 6a and the lower surface portion 5c of each locking projection 5a prevents the release cylinder 6 from coming out of the pipe joint body 1.

A sloping surface 6 d is formed at the tip of the release cylinder 6, and the sloping surface 6 d expands the claw portion 4 a of the annular chuck 4 by moving the release cylinder 6 inward. Next, the operation of this embodiment will be described.

In FIG. 1, when the tubular body 7 is inserted into the release cylinder 4 and pushed in, the tip of the tubular body 7 contacts the annular chuck 4, and the pushing action of the tubular body 7 expands the claw portion 4 a of the annular chuck 4. Open and pass. When the pipe body 7 is further pushed in, the pipe body 7 passes while closely adhering to the seal ring 3, and the tip end portion of the pipe body 7 contacts the innermost end portion of the mounting recess 2. In this state, the claw portion 4c of the annular chuck 4 is pushed into the outer peripheral surface of the tubular body 7 by the elastic deformation action of the annular chuck 4, and the mounting of the tubular body 7 on the pipe joint is completed.

When removing the pipe body 7 from the pipe joint, the release cylinder 6 is pushed inward of the pipe joint body 2 so that the beveled surface 6d at the tip thereof abuts against the annular chuck 4, and the claw portion 4a of the annular chuck 4 is expanded. Let it open. As a result, the biting of the claw portion 4a into the pipe body 7 is released, and the pipe body 7 can be pulled out from the pipe joint.

In the present embodiment, a plurality of locking projections 5a are formed at equal intervals on the inner peripheral surface of the inlet portion of the guide cylinder 5 that is fitted into the pipe joint body 1 in a non-slidable manner. A plurality of locking windows 6a into which the stopper ridges 5a are fitted are hollowed out at regular intervals. Therefore, the outer diameter of the outer peripheral surface of the distal end portion of the release cylinder 6 can be minimized. Therefore, the diameter of the distal end portion of the guide cylinder 5 that movably accommodates the distal end portion of the release cylinder 6 and the diameter of the pipe joint body 1 can be set to the minimum diameter that can obtain the required strength. It is possible to further reduce the size of the joint. Further, since the outer peripheral surface of the distal end portion of the release tube 6 is hollowed out to form the plurality of locking windows 6a, the weight of the pipe joint can be reduced by that amount.

The present invention is not limited to the above embodiment, but can be implemented in the following modes. (1) In the above embodiment, the locking projections 5a of the guide cylinder 5 and the locking windows 6a of the release cylinder 6 are four in each case, but two or more locking projections and locking windows may be used. . (2) In the above embodiment, the lateral width of the locking window 6a of the release cylinder 6 is set to be slightly larger than the lateral width of the locking projection 5a, but the lateral width of the locking window 6a is required for the support portion 6b. It is also possible to increase the strength to obtain a sufficient strength.

[0023]

[Effect of device]

 As described in detail above, according to the present invention, a plurality of locking projections are provided on the inner peripheral portion of the mounting recess of the pipe joint body, and the locking projections are fitted on the intermediate portion of the outer peripheral surface of the release cylinder. A plurality of locking recesses are provided. Therefore, the outer diameter of the outer peripheral surface of the distal end portion of the release tube can be minimized, and the diameter of the pipe joint body that movably accommodates the release tube can be set to the minimum diameter that can obtain the required strength. This has the excellent effect of further reducing the size of the pipe joint.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a state before inserting a tubular body in an embodiment embodying the present invention.

FIG. 2 is a plan view of a guide ring.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along line BB in FIG.

FIG. 5 is a front view of a release cylinder.

6 is a cross-sectional view taken along the line CC of FIG.

FIG. 7 is a vertical cross-sectional view showing a state before insertion of a tubular body in a conventional example.

[Explanation of symbols]

1 pipe joint body, 2 mounting recess, 3 seal ring, 4
An annular chuck as a locking member, 5a a locking projection as a locking projection, 6 a release tube, 6a a locking window as a locking recess, 7 a tube, an L axis.

Claims (3)

[Scope of utility model registration request] 1. A mounting recess (2) provided in an inlet portion of a tubular pipe joint body (1) and a mounting recess (2) which is disposed from the downstream side of the pipe joint body (1). Tube (7)
A seal ring (3) for sealing the outer circumference of the pipe, a locking member (4) arranged downstream of the seal ring (3) for locking the inserted pipe (7), and the pipe. Body (7)
Is provided on the downstream side of the locking member (4) so as to penetrate therethrough, and is provided so as to be movable in the axial direction of the pipe joint body (1). The locking member (4) is expanded by increasing the diameter. A pipe joint comprising a member (4) and a release tube (6) for releasing the lock between the pipe body (7), wherein a plurality of locking projections (5) are provided on the inner peripheral part of the mounting recess (2).
a) is provided, and the locking projections (5a) are fitted in the release cylinder (6) at the intermediate portion of the outer peripheral surface thereof, and the release cylinder (6) is guided in the axial direction of the pipe joint body (1). A plurality of locking recesses (6
A pipe joint provided with a). 2. The pipe joint according to claim 1, wherein the locking recess is a locking window (6a) provided through the release cylinder (6). 3. The pipe joint according to claim 1, wherein the release cylinder (6) is made of plastic.