JPH09329285A - Pipe coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve fitting-in operability of a cylindrical member on the mating side. SOLUTION: After, when a plug (a cylindrical member on the mating side) 40 is fitted in a socket (a pipe coupling) 10, a moving cylinder 20 is moved backward and a lock ball 22 is moved aside to the outer peripheral side, the lock ball 22 is pressed on a slope 17 against the inner peripheral side through energization of a compression coil spring 23 and fitted in a lock groove 41 and brought into a lock state. During fitting-in, there is no need to move the moving cylinder 20 to a release position and with this state, a plug 40 may be inserted, whereby excellent fitting-in operability is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for connecting mating tubular members.

[0002]

2. Description of the Related Art A conventional pipe joint, as shown in FIG.
The tubular joint body 1, the lock ball 2 movably attached to the joint body 1 in the radial direction, the lock position (the position shown in FIG. 22) and the release position (FIG. 22) along the outer periphery of the joint body 1.
(Moving position to the right of the lock position), a compression coil spring 4 that urges the movable cylinder 3 to the lock position, and a movable coil 3 that is formed on the inner circumference of the movable cylinder 3 and is movable. It is provided with a relief recess 5 that allows the lock ball 2 to be displaced to the outer peripheral side when the cylinder 3 is in the release position.

When the mating tubular member 6 is fitted, the movable barrel 3 is manually moved to the release position against the bias of the compression coil spring 4 so that the retracting recess 5 corresponds to the lock ball 2. This allows the lock ball 2 to be displaced toward the outer peripheral side. When the mating tubular member 6 is fitted in this state, the lock ball 2 is once retracted to the outer peripheral side to allow the mating tubular member 6 to be fitted. Then, when the opponent cylindrical member 6 reaches a predetermined fitting position where the lock groove 7 on the outer periphery of the cylindrical member 6 corresponds to the lock ball 2, the movable cylinder 3 is released from the movable cylinder 3 by the compression coil spring 4. The lock ball 2 is moved to the lock position, and accordingly, the lock ball 2 is pushed toward the inner peripheral side to engage with the lock groove 7. This allows
The mating tubular member 6 is locked in the fitted state.

[0004]

The above-mentioned conventional pipe joint is
When the mating tubular member 6 is mounted, the movable barrel 4 in the locked position must be manually moved to the unlocked position, which has a drawback of poor operability. The present invention was created in view of the above circumstances, and an object thereof is to improve the fitting operability of a mating tubular member.

[0005]

According to the invention of claim 1, a joint body having a tubular shape, and a movable barrel axially movable between a lock position and a release position along the inner circumference of the joint body. When,
A biasing member for biasing the movable barrel toward the lock position, a lock member provided on the movable barrel so as to be displaceable in the radial direction, and a biasing member to the outer peripheral side of the lock member with the movable barrel moved to the release position. A mating tubular member that is configured to include a retracting recess that allows displacement and an inclined surface that causes the lock member to project to the inner peripheral side as the movable cylinder moves toward the lock position, and is fitted into the movable cylinder. It is characterized in that the other side tubular member is locked in the fitted state by the engagement of the lock member with the outer periphery of the.

The invention of claim 2 is characterized in that, in the invention of claim 1, the biasing member is mounted along the inner circumference of the joint body. The invention of claim 3 is
In the invention of claim 1 or 2, the movable cylinder is assembled by being fitted into the joint body from the end surface on the lock position side toward the release position side, and is movable on the inner circumference of the joint body. It is characterized in that a stopper ring for restricting removal of the cylinder in the lock position direction is fitted.

According to a fourth aspect of the present invention, in addition to the first or second aspect of the invention, the joint body is composed of a front tubular member and a rear tubular member that are axially unitable, and the front tubular member is An inclined surface is formed on the inner circumference, and when assembling, the rear tubular member is united after the movable tubular member is fitted into the front tubular member from the rear side, and the movable tubular member is joined by the rear tubular member. It is characterized in that the removal of the movable cylinder toward the release position side is restricted and the removal of the movable cylinder toward the lock position side is restricted by engaging the inclined surface of the lock member.

[0008] The invention of claim 5 is the invention of claims 1 to 4.
In any one of the inventions, in the mating state of the mating tubular member, the locking operation is performed by the locking member being sandwiched between the inclined surface and the receiving surface of the outer circumference of the mating tubular member. Further, it is characterized in that the inclined surface and the receiving surface are parallel to each other.

[0009]

According to the invention of claim 1, the lock member projects toward the inner peripheral side of the movable cylinder when the mating tubular member is not fitted, and from this state, the mating tubular member is When fitted, the mating tubular member pushes the movable barrel and the lock member to the release position side, and when the locking member is pushed outward, the mating tubular member pushes the movable barrel and the lock member. Since it is released, the lock member pushed to the release position side by the biasing member is displaced to the inner peripheral side by the inclined surface,
By engaging the locking member with the outer peripheral surface of the mating tubular member, the mating tubular member is locked in the fitted state. When the mating tubular member is pulled in the pull-out direction, the engaging force of the locking member to the mating tubular member is increased by the reaction force from the inclined surface, so that a reliable locking effect is obtained. When the movable cylinder is pushed from the locked state to the release position side, the lock member is disengaged from the mating tubular member and retracts to the outer peripheral side, whereby the lock is unlocked and the mating tubular member can be pulled out in this state. You can As described above, the pipe joint of the present invention is mounted and locked by simply inserting the mating tubular member, and thus has excellent operability.

In the invention of claim 2, the biasing member is
Since it is provided along the inner circumference of the joint body like the movable cylinder, the diameter can be reduced as compared with the case where the movable cylinder and the urging member overlap on the inner circumference side and the outer circumference side. In the invention of claim 3, as a means for accommodating the movable cylinder in the joint body, the movable cylinder is inserted from the end face of the joint body, and then the stopper ring is fitted to restrict the removal of the movable cylinder. Thus, the joint body can be a single piece. Thereby, cost can be reduced.

According to the fourth aspect of the invention, when the mating tubular member is not fitted yet, the portion of the lock member projecting from the movable barrel toward the outer peripheral surface comes into engagement with the inclined surface. Therefore, as compared with the case where the lock member is pressed against the inner peripheral surface of the joint body and does not protrude from the outer peripheral surface of the movable cylinder, the thickness of the movable cylinder is reduced by the protruding dimension of the lock member, and the pipe The overall diameter of the joint can be reduced. According to the fifth aspect of the invention, when the movable cylinder is moved to the release position side in the locked state, the lock member is mounted on the receiving surface and retracted to the outer peripheral side to release the lock. In the locked state, since the inclined surface and the receiving surface are parallel to each other, a movement space for the locking member is secured between the receiving surface and the inclined surface, so that the locking member releases the mating tubular member. It is possible to immediately move diagonally to the outer peripheral side without axially moving to the position side. Therefore, it is not necessary for the mating tubular member to move in the axial direction when unlocking.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

<First Embodiment> Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. <Socket 10> First, the socket (a pipe joint which is a constituent of the present invention) 10 will be described. The joint body 11 that constitutes the socket 10 is composed of a front tubular member 11F and a rear tubular member 11R, and a female screw portion on the inner periphery of the rear end portion (the right end portion in FIG. 1) of the front tubular member 11F. The tubular body 11F and 11R are integrally coupled by screwing the male threaded portion on the outer periphery of the front end portion of the rear tubular member 11R to form the joint body 11. On the outer periphery of the rear end portion of the rear tubular member R, a male screw portion 12 for connecting a tubular member (not shown) such as a hose or a pipe for fluid circulation is formed.

On the inner circumference of the front side tubular member 11F, a region which is continuous from the female threaded portion at the rear end portion to the front with the same inner diameter is a retreat concave portion 16. This evacuation recess 16
Are secured to allow displacement of the lock ball 22 to the outer peripheral side as described later. Similarly, the front end portion on the inner circumference of the front side tubular member 11F has a smaller diameter than the retracting recess portion 16, and a space between the front end portion and the retracting recess portion 16 is continuous with the retracting recess portion 16 and is reduced in diameter toward the front. The inclined surface 17 has a tapered shape. In addition, this inclined surface 1
Although the inclination angle with respect to the axis 7 is 30 ° in the present embodiment, the inclination angle is not limited to 30 ° and may be another inclination angle.

On the other hand, the front end surface of the rear tubular member 11R constitutes the rear end surface of the retracting recess 16, and the rear tubular member 1
The inside diameter of the front end of 1R is set to the same size as the inside diameter of the front end of the front tubular member 11F. Rear tubular member 11R
The inner diameter of the central portion in the axial direction is smaller than that of the front end portion, and the step-shaped boundary portion is a locking surface 18 facing forward. A movable cylinder 20 is fitted in the joint body 11 so as to be relatively movable in the front-rear direction (axial direction).
The outer peripheral surface of the movable cylinder 20 is slidably contacted with the inner periphery of the front end of the front tubular member 11F and the inner periphery of the front end of the rear tubular member 11R to prevent rattling in the radial direction. Movable tube 2
Circular support holes 21 are formed at a plurality of positions at equal angular intervals in the circumferential direction of 0. The support hole 21 has an opening diameter on the inner peripheral side of the movable cylinder 20 smaller than an opening diameter on the outer peripheral side.

A lock ball (a lock member which is a constituent of the present invention) 22 is accommodated in the support hole 21 by being fitted from the outer peripheral side. The diameter of the lock ball 22 is larger than the diameter of the opening on the inner peripheral side of the support hole 21, so that the lock ball 22 does not come off to the inner peripheral side of the movable cylinder 20. Further, the diameter of the lock ball 22 is set to be approximately three times the thickness of the movable cylinder 20, and when the lock ball 22 is located closest to the inner periphery in the support hole 21, the lock ball 22 is The movable cylinder 20 protrudes to both the inner peripheral side and the outer peripheral side. The lock ball 22 is configured to move in the front-rear direction integrally with the movable cylinder 20, and
Relative displacement in the radial direction.

The movable cylinder 20 is always urged forward by a compression coil spring (biasing member which is a constituent feature of the present invention) 23 mounted between the rear end surface and the locking surface 18 of the rear cylindrical member 11R. ing. With this urging force, the movable cylinder 20
Is held at a position where the front end portion projects from the front end surface of the front cylindrical member 11F and the lock ball 22 is locked on the inclined surface 17 (hereinafter, this position is referred to as a lock position). In this state, the reaction force of the inclined surface 17 against the axial elastic force of the compression coil spring 23 is
Act radially inward with respect to the lock ball 22.
Keeps the movable cylinder 20 protruding inward.

When the movable barrel 20 is displaced rearward against the bias of the compression coil spring 23 to move the lock ball 22 to a position corresponding to the retracted recess 16 (hereinafter referred to as a release position), the lock ball 22 moves. By being accommodated in the retracting recess 16, it becomes possible to displace to the outer peripheral side. In this state, the lock ball 22 is completely accommodated in the support hole 21 and the amount of the lock ball 22 protruding toward the inner peripheral side of the movable cylinder 20 becomes zero.

Movable barrel 20 in the rear tubular member 11R
A knurled ring 24 is mounted on the rear side of the shaft in a relatively non-rotatable state by press fitting. The knurl ring 24 is positioned in the axial direction by engaging a flange 25 on the outer periphery of a rear end thereof with the locking surface 18, and the rear end of the compression coil spring 23 is in contact with the flange 25. . On the inner circumference of the knurl ring 24, a large number of knurls 26 extending in the axial direction are formed at a uniform pitch over the entire circumference. This knurled 26
Engages with knurls 44 on the outer periphery of the plug 40, which will be described later, to restrict relative rotation between the socket 10 and the plug 40.

An O-ring 27 made of synthetic rubber is fitted at a position rearward of the knurled ring 24. The O-ring 27 is elastically crushed between the inner peripheral surface of the rear tubular member 11R and the outer peripheral surface of the plug 40 so as to ensure waterproofness between the peripheral surfaces. Further, a packing attachment portion 28 having a step-like smaller diameter is formed at a position rearward of the O-ring 27 on the inner circumference of the rear tubular member 11R. The packing mounting portion 28 has a protective packing 2 made of a synthetic resin material having higher corrosion resistance and heat resistance than the O-ring 27 such as Teflon.
9 is fitted. The outer peripheral surface and the inner peripheral surface of the protective packing 29 are in close contact with the inner peripheral surface of the rear tubular member 11R and the outer peripheral surface of the plug 40, respectively. further,
A tapered sealing surface 30 is formed at the boundary between the inner peripheral surface and the front end surface of the protective packing 29, and the sealing surface 30 is brought into close contact with the outer peripheral sealing surface 45 of the plug 40. .

Although both the protective packing 29 and the O-ring 27 are provided in the gap between the socket 10 and the plug 40, the protective packing 29 is provided in the fluid flow path when the socket 10 and the plug 40 are fitted together. On the other hand, the O-ring 27 is arranged at a position close to the penetration part 31 where the gap between the socket 10 and the plug 40 faces, and the O-ring 27 is arranged at a position opposite to the penetration part 31 with the protective packing 29 sandwiched therebetween. Therefore, it becomes difficult for the fluid to directly contact the O-ring 27.

The assembling of the socket 10 is performed as follows. First, the front tubular member 11F and the rear tubular member 11R that form the joint body 11 are separated,
The protective packing 29, the O-ring 27, the knurled ring 24, and the compression coil spring 23 are fitted in order in the rear tubular member 11R. The movable cylinder 20 supporting the lock ball 22 is fitted in one front side cylindrical member 11F.
Then, the front tubular member 11F and the rear tubular member 11R are brought closer to each other in the axial direction and screwed together to be integrated, so that the above-mentioned components are housed in the joint body 11. In the assembled state, the lock ball 22 is engaged with the inclined surface 17, whereby the movable barrel 20 and the compression coil spring 23 are restricted from being pulled out from the joint body 11 forward, and the movable barrel 20 and the compression coil spring 23 are prevented. Is removed by the rear tubular member 11R. Also,
Since the knurled ring 24 is press-fitted, removal of the knurled ring 24 and removal of the O-ring 27 and the protective packing 29 are also restricted.

<Plug 40> Next, the plug (a mating tubular member which is a constituent of the present invention) 40 will be described.
The plug 40 has a tubular shape as a whole, and the outer diameter dimension thereof is set to be the same as the inner diameter of the movable barrel 20 so that the plug 40 can be fitted into the movable barrel 20 without radial play. Has become. The inner diameter of the plug 40 is set to be the same as the inner diameter of the rear end portion of the rear tubular member 11R of the socket 10.

A male screw portion 47 for connecting a tubular member (not shown) such as a hose or a pipe for fluid circulation is formed on the outer periphery of the rear end portion (the end portion on the left side in FIG. 1) of the plug 40. Has been done. A lock groove 41 is formed on the outer periphery of the plug 40. The lock groove 41 is formed at a position corresponding to the inclined surface 17 in the fitted state with the socket 10, and the lock ball 22 is fitted into the lock groove 41 when the fitted socket 10 and the plug 40 are locked. It has become. A taper-shaped receiving surface 42 is formed at an edge portion on the tip side (right side in the drawing) of the lock groove 41. The inclination angle of the receiving surface 42 with respect to the axial direction is set to 30 ° like the inclined surface 17, and therefore the inclined surface 1
7 and the receiving surface 42 are parallel to each other. When the lock ball 22 engages with the inclined surface 17 and the receiving surface 42, the socket 10 and the plug 40 come to be locked in the removal restriction state.

A region of the outer periphery of the plug 40 closer to the tip end than the lock groove 41 has a diameter smaller than the inner diameter of the movable barrel 20, and a boundary portion having a different diameter has a tapered pressing surface 43.
It has become. A large number of knurls 44 extending in the axial direction are formed on the outer circumference on the tip side of the pressing surface 43 at a uniform pitch over the entire circumference. This knurled 44
Is set to the same pitch as the knurl 26 of the socket 10, and the relative rotation of the socket 10 and the plug 40 is regulated by fitting both knurls 26 and 44. In addition, since the pitches of the knurls 26 and 44 are uniform over the entire circumference, the socket 10 and the plug 40 are axially moved closer to each other regardless of the relative postures of the socket 10 and the plug 40 in the rotation direction. The knurls 26 and 44 are engaged with each other by moving them.

Knurled 44 on the outer periphery of the plug 40
The tip end side is a smooth surface having the same diameter as the valley of the knurl 44, and the O-ring 27 of the socket 10 is in close contact with this surface. Furthermore, the diameter of the tip side is smaller than the contact surface with the O-ring 27, and the inner peripheral surface of the protective packing 29 of the socket 10 is adhered to the small diameter portion. A tapered seal surface 45 that is in close contact with the seal surface 30 of the protective packing 29 is formed at the boundary between the contact surface with the O-ring 27 and the contact surface with the protective packing 29.

Next, the operation of the present embodiment will be described. When the plug 40 is inserted into the socket 10, the pressing surface 43 of the plug 40 causes the movable barrel 20 of the lock ball 22 to move.
The lock ball 22 and the movable cylinder 20 are pushed rearward by engaging with the portion projecting to the inner peripheral side of the. Then, the lock ball 22 moves to a position corresponding to the retracted recess 16, so that the lock ball 22 is pushed to the outer peripheral side according to the inclination of the pressing surface 43. As a result, the engagement between the lock ball 22 and the pressing surface 43 is released, and the backward pushing motion of the lock ball 22 and the movable barrel 20 is released, while the plug 40 is further inserted. During this time, the lock ball 22 is pressed against the inclined surface 17 by the biasing force of the compression coil spring 23, and is pressed against the outer peripheral surface of the plug 40 by the reaction force from the inclined surface 17.

When the plug 40 reaches the predetermined fitting position, the lock groove 41 comes to correspond to the lock ball 22, so that the lock ball 22 is compressed by the compression coil spring 23.
It is pushed toward the inner peripheral side by the urging force of and is fitted into the lock groove 41. Then, the lock ball 22 is axially sandwiched between the inclined surface 17 and the receiving surface 42 of the plug 40, so that the plug 40 is locked with respect to the socket 10 in the removal restriction state. In this locked state, the knurl 26 of the knurl ring 24 and the knurl 44 of the plug 40
Rotation of the plug 40 with respect to the socket 10 is restricted by the engagement of and in the circumferential direction. Therefore, the plug 40 and the socket 10 can be positioned in the rotational direction.

The inner peripheral surface of the socket 10 and the plug 40
A continuous O-ring 27 and a protective packing 29 are interposed between the outer peripheral surface of the O-ring 27 and the protective packing 29.
This prevents water from entering the gap between the socket 10 and the plug 40. When removing the plug 40 from the locked state, the front end portion of the movable cylinder 20 protruding from the front end surface of the joint body 11 is pushed in. Then, as shown in FIG. 4, the lock ball 22 rides on the receiving surface 42 of the plug 40 and diagonally moves rearward relative to the receiving surface 42 in parallel with the inclination angle thereof. Then, when the lock ball 22 passes through the receiving surface 42 and completely rides on the outer peripheral surface of the plug 40 as shown in FIG.
Since 2 disengages from the lock groove 41 and retreats outside the outer periphery of the plug 40, the lock is released. When the plug 40 is pulled in this state, it can be pulled out from the socket 10. After removing the plug 40, if the hand is released from the movable cylinder 20, the movable cylinder 20 is returned to the lock position by the bias of the compression coil spring 23.

According to this embodiment described above, the following effects are exhibited. When mounting the plug 40, a screwing operation is performed, or the movable cylinder 20 is attached on the socket 10 side.
Since it is not necessary to move the to the release position side, the installation work does not take time and labor, and is excellent in workability. Further, since the plug 40 does not need to be rotated but only needs to be inserted straight in the axial direction, it does not require a large space in the periphery for mounting, and it can be easily mounted even in a narrow place, and restrictions on the mounting place are required. Is less.

Further, in this embodiment, since the lock groove 41 is formed on the outer periphery of the plug 40 and the receiving surface 42 and the lock ball 22 are engaged with each other in the axial direction to lock the same, the axial direction is changed. Even if a strong pulling force is applied, there is no risk of the locked state being released, and the locking operation is highly reliable.
In the present embodiment, in the locked state, the O-ring 27 and the protective packing 29 that are continuously continuous over the entire circumference between the inner peripheral surface of the socket 10 and the outer peripheral surface of the plug 40 are provided for waterproofing. A high waterproof effect can be obtained, and even a worker who does not have a skilled construction technique can perform reliable waterproof construction.

Further, since the double sealing structure of the O-ring 27 and the protective packing 29 is adopted as the sealing member, a higher waterproof effect is exhibited. Moreover, the protective packing 29 and the plug 40 have the tapered sealing surfaces 30, 4
Since the five members are in close contact with each other, the higher the pressing force in the inserting direction of the plug 40, the higher the degree of close contact, and a higher waterproof performance than the contact structure between the peripheral surfaces where the closeness of contact is constant. To be

Since the protective packing 29 is provided so that the fluid does not come into direct contact with the O-ring 27, for example, when the fluid is tap water, sodium chlorate or trihalomethane contained in the tap water is used. O-ring 27 is corroded and deteriorated by organic compounds such as
The O-ring 27 is prevented from being deteriorated by being exposed to a high temperature fluid. Thereby, the waterproof function of the O-ring 27 is maintained for a long time. In the present embodiment, the inclined surface 17 and the receiving surface 42 are formed in parallel with each other, so that the inclined surface 17
A space for moving the lock ball 22 from the holding position of the lock ball 22 in the locked state toward the lock release direction is secured between the and the receiving surface 42. This allows
When the movable cylinder 20 and the lock ball 22 are moved rearward when the plug 40 is removed, the plug 40 does not move in the depth direction of the socket 10 and the lock ball 22 immediately climbs up on the receiving surface 42 and moves rearward on the outer peripheral side. It will be displaced diagonally to. In this way, since it is not necessary to move the plug 40 in the inserting direction when removing the plug 40, a sealing structure can be achieved by the protective packing 29 and the tapered sealing surfaces 30, 45 of the plug 40 being in close contact with each other.

In the present embodiment, in view of the structural feature that the lock ball 22 always protrudes to the outer peripheral side of the movable barrel 20, the joint barrel 11 is made into a two-piece structure so that the movable barrel 20 is housed from behind and locked. The ball 22 is engaged with the inclined surface 17, and the lock ball 22 and the inclined surface 17 are engaged with each other so that the function of preventing the movable cylinder 20 from being pulled out forward is exhibited. Therefore, compared with a structure in which the thickness of the movable cylinder 20 is made larger than that of the present embodiment and the lock ball is pressed by the inner peripheral surface of the joint body so that the lock ball does not project to the outer peripheral side of the movable cylinder. In this embodiment, the outer diameter of the socket 10 can be reduced by the difference in the thickness of the movable barrel 20. Moreover, the compression coil spring 23 and the movable cylinder 20 are not arranged so as to overlap the inner peripheral side and the outer peripheral side, but rather the joint body 1
As it is arranged vertically along the inner circumference of 1,
It is possible to reduce the diameter. In addition, in the present embodiment, the number of parts can be small despite the effects such as the improvement of the mounting operability of the plug 40, the high waterproof function, and the miniaturization as described above.

<Second Embodiment> Next, a second preferred embodiment of the present invention will be described with reference to FIG. Embodiment 2
The structure of the plug is partially different from that of the first embodiment. Since the other configurations of the plug and the configuration of the socket are the same as those in the first embodiment,
The same configurations are denoted by the same reference numerals, and the description of the structure, action, and effect will be omitted. The outer periphery of the plug 46 of the second embodiment is not provided with the parts corresponding to the lock groove 41, the receiving surface 42, and the pressing surface 43 of the first embodiment, and is the portion with which the lock ball 22 is engaged in the locked state. Is an outer peripheral surface having a smooth circular cross section. When the plug 46 is inserted into the socket 10, the movable barrel 20 and the lock ball 22
Is pushed almost rearward, and the plug 46 reaches a predetermined fitting position. In this state, the lock ball 22 is pressed against the outer peripheral surface of the plug 46 by the reaction force from the inclined surface 17 caused by the bias of the compression coil spring 23.
Due to the frictional force with the lock ball 22, the plug 46
Is locked in the removal restriction state. When a pulling force is applied to the plug 46 in this locked state, the lock ball 22
Since the pressing force on the inclined surface 17 of the plug 4 increases, the plug 4 that acts on the lock ball 22 from the inclined surface 17
The pressing force on the outer peripheral surface of 6, that is, the frictional force between the lock ball 22 and the plug 46 also increases. Therefore, as the pulling force on the plug 46 increases, the locking performance increases, so that a high locking function is exerted.

<Third Embodiment> Next, a third embodiment of the present invention will be described with reference to FIGS. 9 and 10. In the third embodiment, the structure of the socket is partially different from that of the first embodiment. Since the other configurations of the socket and the configuration of the plug are the same as those of the first embodiment, the same configurations are denoted by the same reference numerals, and the description of the structure, the action, and the effect will be omitted. Whereas the joint body 11 of the socket 10 of the first embodiment is composed of two parts, the joint body 51 of the socket 50 of the third embodiment is composed of a single part. An evacuation recess 16 is formed on the inner periphery of the joint body 51 so as to be expanded in diameter. A tapered inclined surface 17 is formed in the retracting recess 16 so as to be continuous forward. The inclination angle of the inclined surface 17 is also 30 ° as in the first embodiment. A ring groove 52 is formed in front of the inclined surface 17. A stopper ring 53 having a C-shape is fitted in the ring groove 52.

A region behind the retracting recess 16 is a stepped small diameter portion 51A, and a region rearward of the small diameter portion 51A is also a stepped small diameter portion 51B.
A locking surface 18 is formed at the boundary between the small diameter portions 51A and 51B.
The flange 25 of No. 4 is locked and positioned. In the joint main body 51, the lock ball 22 is formed in the support hole 55.
The movable cylinder 54 supporting the is mounted so as to be relatively movable in the front-rear direction (axial direction). The opening diameter of the support hole 55 toward the inner periphery of the movable cylinder 54 is set smaller than the diameter of the lock ball 22. In a state where the lock ball 22 is displaced to the innermost side, the lock ball 22 partially protrudes toward the inner side of the movable tube 54, but does not protrude toward the outer side of the movable tube 54 at all. 55. That is, the thickness dimension of the movable cylinder 54 of the third embodiment is larger than the thickness dimension of the movable cylinder 20 of the first embodiment.

The front end portion of the outer periphery of the movable cylinder 54 has a step-like small diameter, and an engaging portion 56 is formed in the step-like portion. The movable cylinder 54 is urged forward by the compression coil spring 23 and always engages with the engaging portion 56 as shown in FIG.
Is held at a lock position where it is engaged with the stopper ring 53. In this state, the detachment of the movable cylinder 54 toward the front is restricted by the engagement between the engagement portion 56 and the stopper ring 53. In this state, the lock ball 22
Is completely accommodated in the support hole 55 and does not project to the outer peripheral side of the movable cylinder 54, and the region on the inner peripheral surface of the joint body 51 on the front end side of the inclined surface 17 with respect to the lock ball 22. Is supported.

The socket 50 is assembled in the following manner. First, the stopper ring 53 is removed from the ring groove 52, and the movable cylinder supporting the protective packing 29, the O ring 27, the knurl ring 24, the compression coil spring 23, and the lock ball 22 from the front opening in the joint body 51. 54 is fitted in order. Then, the movable cylinder 54
Is pushed in so that its front end is located rearward of the ring groove 52, and the stopper ring 53 is attached to the ring groove 52 in this state. After the mounting, when the user releases his hand from the movable cylinder 54, the movable cylinder 54 moves forward by the bias of the compression coil spring 23 and is held at the lock position where the movable cylinder 54 is engaged with the stopper ring 53. In the assembled state, the engagement between the engaging portion 56 and the stopper ring 53 restricts the movable cylinder 54 and the compression coil spring 23 from being pulled out forward.

Next, the operation of the present embodiment will be described. Insert the plug 40 into the socket 50 and the plug 4
The pressing surface 43 of No. 0 engages with the portion of the lock ball 22 projecting to the inner peripheral side of the movable cylinder 54, and the lock ball 22
And the movable cylinder 54 are pushed backward. Then, the lock ball 22 moves to a position corresponding to the retracted recess 16,
As the pressing surface 43 is inclined, it is pushed outward.
As a result, the engagement between the lock ball 22 and the pressing surface 43 is released, and the backward pushing motion of the lock ball 22 and the movable barrel 54 is released, while the plug 40 is further inserted. Lock ball 22 extruded to the outer peripheral side
Is pressed against the inclined surface 17 by the biasing force of the compression coil spring 23, and is pressed against the outer peripheral surface of the plug 40 by its reaction force.

When the plug 40 reaches the predetermined fitting position and the lock groove 41 corresponds to the lock ball 22, the lock ball 22 is fitted in the lock groove 41 and the shaft between the inclined surface 17 and the receiving surface 42. By being pinched in the direction, the plug 40
Is locked with respect to the socket 50 in a removal restriction state.
In the locked state, as in the first embodiment, the knurl 2
The rotation of the plug 40 is regulated by the engagement of 6, 44 with each other, and the O-ring 27 and the protective packing 29 exert a waterproof function. Also, when removing the plug 40, similarly to the first embodiment, the plug 40 may be pulled out while the front end portion of the movable barrel 54 protruding from the front end surface of the joint body 51 is pushed in and the lock is released.

According to this embodiment, in addition to the same effects as those of the first embodiment, the following effects are exhibited.
That is, the joint body 11 of the first embodiment is composed of two parts, whereas the joint body 5 of the third embodiment is composed.
1 consists of a single part. In the third embodiment, in order to realize this single component, the components other than the joint body 51 forming the socket 50 are housed and assembled from the opening of the front end surface of the joint body 51, and the C-shaped stopper ring 53 is provided.
Adopts a structure that restricts parts from falling out. As a result, the number of parts is reduced, and eventually the cost is reduced.

<Fourth Embodiment> Next, a fourth embodiment of the present invention will be described with reference to FIGS. A socket (a pipe joint which is a constituent feature of the present invention) 60 of the fourth embodiment is obtained by press-fitting a spacer ring 62 instead of the knurled ring 24 in the socket 10 of the first embodiment. The spacer ring 62 is
The groove portion of the knurl 26 in the knurl ring 24 is filled to form a smooth inner peripheral surface. On the other hand, in the plug 61 of the fourth embodiment (the mating tubular member which is a constituent feature of the present invention), the region corresponding to the knurls 44 on the outer periphery of the plug 40 of the first embodiment has the same diameter as the groove bottom of the knurls 44. It has a small diameter so that When the plug 61 is fitted into the socket 60, the outer peripheral surface of the plug 61 is fitted into the inner peripheral surface of the spacer ring 62 in a substantially tight manner. Therefore, in the fitted state, the plug 61
The socket 60 is allowed to rotate relatively.

In the fourth embodiment, the knurls 26 and 44 are used.
Since the other configuration and operation and effect except for the configuration and operation and effect are the same as those in the first embodiment, the same configuration is denoted by the same reference numeral and the description of the structure, operation and effect is omitted. <Fifth Embodiment> Next, a fifth embodiment of the present invention will be described with reference to FIGS. In the fifth embodiment, the same plug (a mating tubular member that is a constituent of the present invention) 61 as in the fourth embodiment is used. Further, in the socket (pipe joint which is a constituent feature of the present invention) 65, the spacer ring 62 of the fourth embodiment is mounted instead of the knurled ring 24 in the socket 50 of the third embodiment, and the protective packing 29 is not mounted. It is configured. A portion corresponding to the packing mounting portion 28 for mounting the protective packing 29 is in a state of being filled with the meat on the inner circumference of the joint body 51. In the fifth embodiment,
The configurations and operational effects other than the configurations and operational effects of the knurls 26 and 44 and the protective packing 29 are the same as those in the third embodiment, and therefore, the same configurations are denoted by the same reference numerals, The description of the structure, action and effect is omitted.

<Sixth Embodiment> Next, a sixth embodiment of the present invention will be described with reference to FIGS. A plug (a mating tubular member that is a constituent feature of the present invention) 71 of the sixth embodiment has a seal groove 72 formed on the outer periphery of the tip portion of the plug 61 of the fifth embodiment and an O-ring in the seal groove 72. 73 is attached. Further, the socket (pipe joint which is a constituent feature of the present invention) 70 of the sixth embodiment is configured such that the O-ring 27 is not attached to the socket 65 of the fifth embodiment. O
The portion corresponding to the small diameter portion 51B where the ring 27 was attached is filled with the meat on the inner circumference of the joint body 51. The O-ring 73 of the plug 71 is brought into close contact with the portion of the joint body 51 filled with the meat on the inner circumference. For other configurations and effects,
Since it is the same as the fifth embodiment, the same components are designated by the same reference numerals, and the description of the structure, action, and effect will be omitted.

<Seventh Embodiment> Next, a seventh embodiment of the present invention will be described with reference to FIGS. In the seventh embodiment, the same plug 40 as the first embodiment (a mating tubular member that is a constituent of the present invention) 40 is used. Further, the socket (pipe joint which is a constituent feature of the invention) 75 of the seventh embodiment is the same as the socket 10 of the first embodiment.
In the above, a ratchet (lock member which is a constituent of the present invention) 787 is used instead of the lock ball 22. The structure of the socket 75 other than the ratchet 78 and the movable cylinder 76 supporting the ratchet 78 is the same as that of the socket 10 of the first embodiment, and the plug 40 is the same as that of the first embodiment. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, and the description of the structure, operation, and effect is omitted.

In the movable cylinder 76, three support grooves 77 that are elongated in the circumferential direction are formed at an equal angular pitch of 120 ° in the circumferential direction. At both ends of the opening on the inner peripheral surface side of the support groove 77, retaining portions 77A are formed. An elongated ratchet 78 having an arc shape is fitted into the support groove 77 from the outer peripheral side so as to be capable of relative displacement in the radial direction. The ratchet 78 is locked to the retaining portion 77A, thereby restricting the ratchet 78 from slipping inward.

The ratchet 78 has a rectangular cross section as a whole, and the inclined surface 17 is formed at the boundary edge between the outer peripheral surface and the front end surface.
Front locking surface 7 abutting at the same angle with respect to
8A is formed, and a tapered rear lock surface 78B that abuts the receiving surface 42 of the plug 40 at the same angle is formed at the boundary edge portion between the inner peripheral surface and the rear end surface. A tapered pressed surface 78C capable of contacting at the same angle as the pressing surface 43 of the plug 40 is formed at the boundary edge portion of.

When the plug 40 is fitted in the socket 75, the pressing surface 43 engages with the pressed surface 78C to push the ratchet 78 and the movable cylinder 76 rearward, and the plug 40 is brought into a predetermined fitting position. Once reached, the front locking surface 7 of the ratchet 78
8A and the rear lock surface 78B are the inclined surface 17 and the receiving surface 4, respectively.
The plug 40 is locked in the fitted state by being locked by 2. When the movable cylinder 76 is pushed in from the locked state, the ratchet 78 is displaced obliquely rearward on the outer peripheral side by sliding the rear locking surface 78B on the receiving surface 42, and the lock is released.

<Other Embodiments> The present invention is not limited to the embodiments described above with reference to the drawings. For example, the following embodiments are also included in the technical scope of the present invention. In addition, various changes can be made without departing from the scope of the invention. (1) According to the present invention, in the case of the two-piece type in which the joint body is composed of two parts as in the first, second, fourth, and seventh embodiments, a single seal structure having only an O ring without a protective packing is adopted. It may be configured. in this case,
Either a structure provided with the rotation restriction means or a structure not provided with the rotation restriction means may be adopted.

(2) According to the present invention, Embodiments 3, 5,
In the case of the one-piece type in which the joint body is composed of one part as in No. 6, it is possible to adopt the single seal structure in which only the O-ring is provided without providing the rotation restricting means and the protective packing. (3) According to the present invention, in the case where the joint body is a one-piece type as in the third, fifth and sixth embodiments, a double seal structure is provided in which the rotary machine restricting means is not provided and the O ring and the protective packing are provided. It can be configured.

(4) According to the present invention, the structure in which the O-ring is provided on the plug side of the sixth embodiment can be applied to any of the first to fifth embodiments and the seventh embodiment. (5) In Embodiments 1 to 4 and 7, a tapered seal surface is formed at a corner portion of the outer peripheral rear end of the protective packing, and a seal surface that is in close contact with the seal surface is formed on the inner periphery of the joint body. It can also be configured to. (6) In Embodiments 1 to 4 and Embodiment 7, the protective packing is mounted on the inner circumference of the socket, but according to the present invention, the protective packing may be mounted on the outer circumference of the plug.

(7) In the above embodiment, the sealing means (O-ring, protective packing) is provided on only one of the socket and the plug, but according to the present invention, the sealing means is provided on both the socket and the plug. It can be configured. (8) In the first, second, third, and seventh embodiments, the knurled ring that constitutes the rotation restricting means is attached to the inner circumference of the joint body by press fitting, but according to the present invention, the outer circumference of the knurled ring and the joint body. The rotation of the joint body of the knurled ring may be restricted by forming concavities and convexities on the inner circumference and fitting them together.

(9) The structure in which the ratchet is used instead of the lock ball in the seventh embodiment can be applied to any of the first to sixth embodiments. (10) The number of lock balls and ratchets as lock members and the arrangement in the circumferential direction can be arbitrarily set. (11) In the above embodiment, the lock ball or the ratchet, which is the lock member, is provided separately from the movable cylinder. However, according to the present invention, the lock member can be provided integrally with the movable cylinder. In this case, a cantilever arm extending in the axial direction may be formed on the movable cylinder, and a lock member may be formed at the tip of the arm.

(12) In the above embodiment, the inclined surface of the socket and the receiving surface of the plug have the same inclination angle with respect to the axial direction so as to be parallel to each other. May have different inclination angles. (13) A straight pipe type plug having no lock groove on the outer periphery like the second embodiment can be attached to any of the sockets of the third to seventh embodiments. (14) A front end portion of the movable cylinder protruding from the socket may be provided with an operating portion having a shape such as a flange that facilitates the pushing operation. This improves the operability when unlocking.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a state where a socket and a plug are separated from each other according to Embodiment 1 of the present invention.

FIG. 2 is a vertical cross-sectional view showing a state in which the plug is fitted in the socket in the first embodiment.

FIG. 3 is a partially enlarged longitudinal sectional view showing a locked state in the first embodiment.

FIG. 4 is a partially enlarged longitudinal sectional view showing a state in the middle of unlocking in the first embodiment.

FIG. 5 is a partially enlarged longitudinal sectional view showing a state in which a lock is released in the first embodiment.

FIG. 6 is a partially enlarged longitudinal sectional view showing a rotation restricting unit and a sealing unit in the first embodiment.

FIG. 7 is an enlarged cross-sectional view showing a rotation restricting unit according to the first embodiment.

FIG. 8 is a vertical cross-sectional view showing a state in which the plug is fitted in the socket in the second embodiment.

FIG. 9 is a vertical sectional view of the socket according to the third embodiment.

FIG. 10 is a vertical cross-sectional view showing a state in which the plug is fitted in the socket in the third embodiment.

FIG. 11 is a vertical sectional view showing a state in which a socket and a plug are separated from each other in Embodiment 4.

FIG. 12 is a vertical cross-sectional view showing a state in which a plug is fitted in a socket in Embodiment 4.

FIG. 13 is a vertical sectional view of a socket according to a fifth embodiment.

FIG. 14 is a vertical cross-sectional view showing a state in which a plug is fitted in a socket in the fifth embodiment.

FIG. 15 is a vertical sectional view showing a state in which a plug and a socket are separated from each other in the sixth embodiment.

FIG. 16 is a vertical cross-sectional view showing a state in which a plug is fitted in a socket in the sixth embodiment.

FIG. 17 is a vertical sectional view showing a state where the plug and the socket are separated from each other in the seventh embodiment.

FIG. 18 is a vertical sectional view showing a state in which the plug is fitted in the socket in the seventh embodiment.

FIG. 19 is a partially enlarged longitudinal sectional view showing a locked state in the seventh embodiment.

FIG. 20 is a cross-sectional view of a movable cylinder according to the seventh embodiment.

FIG. 21 is a plan view of a movable cylinder according to the seventh embodiment.

FIG. 22 is a sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Socket (pipe joint) 11 ... Joint main body 11F ... Front tubular member 11R ... Rear tubular member 16 ... Evacuation recess 17 ... Inclined surface 20 ... Movable barrel 22 ... Lock ball (lock member) 23 ... Compression coil spring (with) Energizing member) 30, 45 ... Sealing surface 40 ... Plug (opposite side tubular member) 41 ... Lock groove 42 ... Receiving surface 50, 65, 70, 75 ... Socket (pipe joint) 51 ... Joint body 53 ... Stopper ring 54, 76 ... Movable tube 61, 71 ... Plug (mate side tubular member) 78 ... Ratchet (lock member)

Claims (5)

[Claims] 1. A tubular joint main body, a movable barrel axially movable along the inner circumference of the joint main body between a lock position and a release position, and the movable barrel to the lock position side. An urging member for urging, a lock member provided on the movable cylinder so as to be displaceable in the radial direction, and allowing displacement of the lock member to the outer peripheral side in a state where the movable cylinder is moved to the release position. A mating tubular member that is configured to include a retreat concave portion and an inclined surface that causes the lock member to project to the inner peripheral side in accordance with the movement of the movable barrel toward the lock position, and is fitted into the movable barrel. The mating tubular member is locked in a fitted state by engaging the lock member with the outer periphery of the pipe joint. 2. The pipe joint according to claim 1, wherein the biasing member is mounted along the inner circumference of the joint body. 3. The movable cylinder is assembled by fitting it into the joint body from the end face on the lock position side toward the release position side, and the lock of the movable cylinder is provided on the inner circumference of the joint body. The pipe joint according to claim 1 or 2, wherein a stopper ring for restricting removal in the position direction is fitted. 4. The joint main body is composed of a front tubular member and a rear tubular member that can be united in the axial direction, and an inclined surface is formed on the inner periphery of the front tubular member. Is fitted with the movable tubular member from the rear side of the front tubular member and then the rear tubular member is united, and the rear tubular member restricts the removal of the movable barrel toward the release position. 3. The pipe joint according to claim 1, wherein the locking member is engaged with the inclined surface to restrict the movable cylinder from being pulled out toward the lock position. 5. When the mating tubular member is in a fitted state, the locking operation is performed by sandwiching the locking member between the inclined surface and the receiving surface on the outer circumference of the mating tubular member, The pipe joint according to any one of claims 1 to 4, wherein the inclined surface and the receiving surface are parallel to each other.