JP2550020Y2 - Pipe fittings - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention consists of a socket provided with a lock ball and a plug formed with a lock ball engagement groove, by operating a sleeve fitted on the outer peripheral surface of the socket. The present invention relates to a pipe joint for engaging and disengaging a socket and a plug by a lock ball, wherein the axial length of the sleeve is made as short as possible.

2. Description of the Related Art As shown in FIG. 4, a socket of a joint called a so-called quick pipe joint generally has a tapered through hole 41 formed at a distal end portion of a socket main body 40, and a lock ball is formed in the through hole 41.
42 is fitted so as to be freely retractable, and furthermore, on the outer peripheral surface of the socket main body 40, a pressing surface 43 for pressing the lock ball 42 in the centripetal direction and an escape portion 44 for allowing the lock ball 42 to escape in the centrifugal direction.
A sleeve 45 having a slidably fitted in the axial direction. A coil spring 46 for urging the sleeve 45 in the direction of pressing the lock ball 42 is interposed between the socket body 40 and the sleeve 45, and a lock ball engaging groove formed on the outer peripheral surface of the plug 47 shown in FIG. In this structure, the lock ball 42 is disengaged from the lock ball 48.

Thus, in the conventional socket, the sleeve 45 is retracted against the elastic force of the coil spring 46 and the escape portion 44 is positioned above the lock ball 42, so that the socket
The insertion of the plug 47 with respect to 40, the separation, and the release of the retracted sleeve 45
45 is advanced by the resilient force of the coil spring 46 compressed by itself, and the socket is mainly formed by the holding surface 43 formed on its inner peripheral surface.
The lock ball 42 engaged with the engagement groove 48 of the plug 47 inserted into the plug 40 is pressed in the centripetal direction, and the socket main body 40 and the plug 47 are pressed.
Is to connect.

However, according to the above-mentioned conventional lock ball type pipe joint, as means for moving the sleeve 45 in the pressing direction of the lock ball 42 only depends on the elastic force of the coil spring 46 in the axial direction. However, there is a disadvantage that the axial length of the socket and the sleeve becomes longer by the amount of housing the coil spring 46, and the entire socket becomes longer.

[Problems to be Solved by the Invention] In view of the fact that conventional pipe joints have disadvantages due to the long sleeve length, the present invention enables the sleeve length to be shortened, simplifies the sleeve operation, and reduces the connection work. An object of the present invention is to provide a pipe joint which can be easily performed, and an object of the present invention is to solve such a point.

Means for Solving the Problems In order to solve the above problems, the present invention comprises a socket having a lock ball and a plug having a lock ball engaging groove, and a sleeve fitted to an outer peripheral portion of the socket. In the pipe joint in which the socket and the plug can be connected and disconnected by operating and disengaging the lock ball from the engagement groove, the lock ball pressing operation direction side of the sleeve is sequentially deepened on the outer peripheral surface of the socket body. An annular groove having an inclined surface as a bottom surface is formed, and a coil ring having a coil diameter larger than the deepest dimension of the annular groove is fitted into the annular groove with shrinkage elasticity, while the inner peripheral surface of the sleeve is fitted. Is provided with an annular groove having a width substantially equal to the coil diameter allowing the coil ring fitted in the annular groove to enter and a depth at least equal to the coil diameter, and the coil is provided in the annular groove. The sleeve and the coil ring can be moved integrally by fitting the ring, and furthermore, the outer peripheral surface of the socket body contacts the end of the sleeve from which the lock ball has been released to restrict further movement of the sleeve. In the inclined surface of the annular groove formed on the outer peripheral surface of the socket main body, the length of the inclined surface in the tube axis direction is at a position where the sleeve abuts the retractable restricting portion. In some cases, a configuration in which the coil ring moved integrally with the sleeve is set on the inclined surface is employed to achieve the intended purpose.

[Operation] The coil ring fitted in the annular groove formed on the outer peripheral surface of the socket body still has the elasticity of contracting the radius even when located at the deepest part of the annular groove, and the coil ring is moved along the inclined surface. When the coil ring is moved to the shallowest part of the annular groove, as it moves on the inclined surface, the coil ring is pushed and expanded in the centrifugal direction against the contraction elasticity to increase the contraction elasticity. Therefore, when the pressing force from the expanded coil ring is released, the coil ring moves toward the deepest bottom surface along the inclined surface due to contraction elasticity, and the radius is reduced.

Therefore, when the sleeve is positively moved in the direction to release the press of the lock ball, the coil ring, which moves integrally with the sleeve in the same direction, is pushed in the centrifugal direction by the bottom surface of the annular groove of the socket body which is an inclined surface. The retracted restricting portion provided on the outer peripheral surface of the socket body abuts on the end of the sleeve which has been expanded and the lock ball is released, and further movement is restricted.When the sleeve is at this position, the coil ring is On the bottom surface consisting of the inclined surface, when released from the pressure for moving the sleeve from this state, the coil ring moves in the annular groove along the inclined surface toward the deepest part along the inclined surface due to the action of the coil ring that is about to contract. Due to the movement of the coil ring, the sleeve is pushed and moved in the lock ball holding direction along with the coil ring,
Restrain the rock ball.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

In the drawings, reference numeral 1 denotes a socket body, and several tapered through-holes 2 whose centripetal directions are close to a radius are formed in a line in a circumferential direction at a front end portion of the socket body 1. A lock ball 3 is fitted to the inner and outer peripheral surfaces of the socket body 1 so as to be able to protrude and retract. Reference numeral 4 denotes a sleeve fitted to the outer peripheral surface of the socket body 1 so as to be slidable in the axial direction. The inner peripheral surface of the sleeve 4 has a lock ball pressing surface 5 for pressing the lock ball 3 in the centripetal direction at a central portion, and a lock ball escape portion 6 for releasing the lock ball 3 is provided at a front portion thereof. doing.

Reference numeral 7 denotes an annular groove provided on the outer peripheral surface of the socket body 1. The annular groove 7 is a tapered through hole 2 into which the lock ball 3 is fitted.
The bottom surface of the annular groove 7 is formed on an inclined surface 8 that is deepest on the front side, that is, on the rock ball 3 side, and is gradually shallow on the rear side. The depth of the deepest part is the coil diameter of the coil ring 9 described later. It is formed slightly smaller.

Reference numeral 9 denotes a coil ring fitted in the annular groove 7 in a slightly extended state. The coil ring 9 has a coil diameter slightly larger than the depth of the deepest portion of the annular groove 7.
The coil ring 9 fitted into the socket protrudes from the outer peripheral surface of the socket body 1 to about the half of the coil diameter to the outside of the annular groove 7.

Reference numeral 10 denotes an annular groove formed on the inner peripheral surface of the rear part of the sleeve 4. The annular groove 10 has a width substantially equal to the coil diameter of the coil ring 9 and a depth that allows the coil ring 9 to expand in the centrifugal direction. , At least a depth substantially equal to the coil diameter. A portion of the coil ring 9 fitted in the annular groove 7 of the socket body 1 and protruding outward from the annular groove 7 is fitted in the annular groove 10 of the sleeve 4, and The side wall 11 serves as a coil ring engaging portion 11 for pressing the coil ring 9 rearward, while the rear side wall is used as an advance restricting portion 12 for contacting the coil ring 9 and restricting the advance of the sleeve 4. It can move integrally with the ring 9.

Further, on the outer peripheral surface of the socket main body 1, a retreat restricting portion 51 which moves rearward to abut against the end of the sleeve 4 which has released the pressing of the lock ball 3 and restricts further rearward movement is provided. It is provided. The inclined surface 8 serving as the bottom surface of the annular groove 7 of the socket body 1 has an axial length that is integral with the sleeve 4 even when the sleeve 4 is in a position where the sleeve 4 is in contact with the retraction restricting portion 51. Is set so as to be located on the inclined surface 8.

Reference numeral 13 denotes a plug connected to the socket main body 1. The point that a lock ball engaging groove 14 for engaging the lock ball 3 is formed on the outer peripheral surface of the plug 13 is the same as the conventional one.

The feature of the present invention is that it is effective for a pipe joint whose axial length is shorter than the radius. As is apparent from FIG. 1, the length of the sleeve 4 of the socket body 1 is short, and
Thirteen of the tip sections are also implemented on short pipe fittings. The configuration described below is the internal structure of the multi-pipe joint.

Reference numeral 15 denotes a base plate provided in the socket body 1. The base plate 15 is provided with a plurality of tube nipples 16 at equal intervals in the circumferential direction. Tubes 17 are respectively inserted into the rear portions of the tube nipples 16, and a front U-shaped seal ring 37 for sealing the front outer peripheral surfaces of a plurality of tube nipples 23 similarly provided in the plug 13 is provided in the front portion. A socket 38 provided on the inner peripheral surface is formed. Reference numeral 18 denotes a lock bolt provided at the center of the base plate 15, and 19 denotes a lock plate screwed to the lock bolt 18, and the lock plate 19 is advanced to the base plate 15 side by tightening the lock bolt 18, thereby forming the lock plate 19. The tube 17 inserted into the tube nipple 16 is pressed against the tube nipple 16 in the centripetal direction on the inner peripheral surface of the tube through hole 49, and the tube 17 inserted into the tube nipple 16 is strongly prevented from being detached. 20
When connecting the socket body 1 and the plug 13, the tube nipple 16 on the socket side and the tube nipple on the plug side
23 is a cover plate for positioning so as to be connected to each other by predetermined nipples.The cover plate 20 is provided with a hole 39 at a position corresponding to the opening of the socket 38, and is provided in the plug 13. The distal end of the tube nipple 23 is configured so as not to be obstructed when being inserted into the socket 38, and the ridge 21 is formed on the outer peripheral surface thereof so as to be engaged with an engagement groove 27 described later. .

22 is a base plate provided in the plug 13,
The base plate 22 is provided with the same number of tube nipples 23 at positions corresponding to the tube nipples 16 on the socket side. Tubes 24 are inserted into rear ends of the tube nipples 23, respectively. 25 is a lock bolt provided in the center of the base plate 22, 26 is a lock bolt
The lock plate is screwed to the lock plate 25.The lock bolt 25 is turned in the tightening direction to advance the lock bolt 25 toward the base plate 22, and the tube nipple 23 is formed on the inner peripheral surface of the tube through hole 50 formed in the lock plate 26. The tube 24 inserted into the tube nipple 23 is pressed in the centripetal direction.
The tube 24 inserted into the tube is strongly prevented from coming off.

Reference numeral 27 denotes an engagement groove formed on the inner peripheral surface of the plug 13 in correspondence with the ridge 21. The engagement of the ridge 21 with the engagement groove 27 makes the tube nipple on the socket body 1 side.
The tube 16 always faces a predetermined tube nipple 23 on the plug 13 side, so that the tube nipple 16 and the tube nipple 23 can be reliably connected when the socket body 1 and the plug 13 are connected.

Reference numerals 28 and 29 denote rubber covers for covering the insertion portions of the tubes 17 and 24. Circular grooves 30 and 31 formed on the outer peripheral surface of the socket body 1 and the outer peripheral surface of the plug 13 respectively cover the covers 28 and 29. Are mounted by engaging inwardly protruding ridges 32, 33 formed at the front of the vehicle.

Reference numeral 34 denotes a screw for fixing the cover plate 20 to the base plate 15 of the socket body 1. Although only one screw is shown in the drawing, the cover plate 20 has at least three screws.
34 is screwed to the peripheral portion of the base plate 15. Reference numeral 35 denotes a screw for fixing the cover plate 36 to the base plate 22 of the plug 13 in the same manner as the screw 34.

 Next, the operation of the above embodiment will be described.

FIG. 1 shows a state in which the socket body 1 and the plug 13 are separated from each other. The coil ring 9 built in the socket body 1 is located at the deepest part of the annular groove 7 by the contractive elastic action in the centripetal direction. I have. Therefore, the sleeve 4 is moved to the front side of the socket body 1 and the lock ball pressing surface 5 is in a state of pressing the lock ball 3 in the centripetal direction.

When the plug 13 is connected to the socket body 1 in such a state, the sleeve 4 is moved backward, while the lock ball escape portion 6 formed at the front of the sleeve 4 is moved.
Is positioned above the lock ball 3. As a result, the lock ball 3 is allowed to escape in the centrifugal direction, and the plug 13 can be inserted into the socket body 1. On the other hand, due to the movement of the sleeve 4, the coil ring 9 engaged with the deepest portion of the annular groove 7 is pressed by the coil ring engaging portion 11 of the sleeve 4 to move the inside of the annular groove 7 toward the shallowest portion. Move,
With this movement, the coil ring 9 expands its radius against the contraction elasticity and expands in the centrifugal direction. When the sleeve 4 is in this position, the end of the sleeve 4 abuts on the retraction restricting portion 51 provided on the socket body 1 to prevent further movement. The ring 9 is located at a shallow portion on the inclined surface 8 of the annular groove 7 formed in the socket body 1 (FIG. 2).

In this state, the protrusion 21 on the socket side and the engagement groove on the plug side
27, the plug 13 is inserted into the socket body 1, and the lock ball engaging groove 14 formed on the outer peripheral surface of the plug 13 is formed.
When the user releases the sleeve 4 when the lock ball 3 fitted in the tapered through hole 2 and the lock ball 3 face each other in the centrifugal centrifugal direction, the sleeve 4 moving rearward is released from the pressing force, whereby the socket The coil ring 9 on the shallow portion of the annular groove 7 of the main body 1 is also released from the pressing force of the sleeve 4, and the coil ring 9 that has been expanded against the contraction elasticity is caused to contract by its own action. Move along the inclined surface 8 of the annular groove 7 toward the deepest part.
Due to the movement of the coil ring 9, the sleeve 4 moves forward, the lock ball pressing surface 5 on the inner peripheral surface of the sleeve 4 presses the lock ball 3 in the centripetal direction, and the lock ball 3 is inserted into the socket body 1. 13 is completely engaged with the lock ball engaging groove 14. Thereafter, the lock ball 3 is prevented from coming out of the lock ball engagement groove 14, and the connection between the socket body 1 and the plug 13 is completed here.

In this manner, the socket body 1 and the plug 13 are connected.
When the plug 13 is inserted, the plug 13 is simultaneously inserted into the sockets 38 of the plurality of tube nipples 16 provided in the socket body 1.
Each tube nipple of the socket body 1 provided in the
The distal end of the tube nipple 23 facing the tube 16 enters, and the outer peripheral surface of the distal end is sealed by a seal ring 37 provided on the inner peripheral surface of the socket 38 of the tube nipple 16.

When the connected socket body 1 and plug 13 are separated, the lock ball 3 is released by operating the sleeve 4 again, and the plug 13 is removed from the socket body 1.

[Effects of the Invention] According to the present invention, as a means for moving the sleeve in the direction of pressing the lock ball, the contraction elasticity of the coil ring is used, and the coil ring is fitted into the tapered annular groove.
Since it is configured to engage with the inner peripheral surface of the sleeve, the axial length of the sleeve can be shortened. In addition, the movement of the sleeve is sufficient for the amount of movement of the coil ring required for holding and releasing the lock ball, so that the sleeve length can be shortened and the length of the socket body is compared with the conventional example. It can be significantly shorter. Therefore, the present invention is extremely effective for a pipe joint whose length in the axial direction is limited, and the present invention can achieve compactness and weight reduction within the range of a diameter which can be manually operated, and furthermore, the locking ball pressing direction of the sleeve. When the sleeve at the lock ball release position is released, the sleeve automatically moves by the contraction action of the coil ring, so that the sleeve operation is simple and the connection operation can be easily performed. .

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a vertical sectional side view showing a socket and a plug separated from each other, and FIG. 2 is a diagram showing a socket operated by connecting a socket and a plug by operating a sleeve. FIG. 3 is a longitudinal sectional side view showing a connection state between a socket and a plug, and FIG. 4 is a partially cutaway side view showing a conventional pipe joint. DESCRIPTION OF SYMBOLS 1 ... Socket body, 2 ... Taper through hole 3 ... Lock ball, 4 ... Sleeve 5 ... Lock ball pressing surface 6 ... Lock ball escape part, 7 ... Annular groove 8 ... Inclined surface, 9 ... Coil ring 10 ... Annular groove, 13 … Plug 14… Lock ball engagement groove

Claims (1)

(57) [Scope of request for utility model registration] 1. A lock ball comprising a socket having a lock ball and a plug having a lock ball engaging groove, wherein a lock ball is engaged and disengaged from the engaging groove by operating a sleeve fitted to an outer peripheral portion of the socket. In the pipe joint in which the socket and the plug can be connected and separated by the above, an annular groove whose bottom surface is an inclined surface in which the lock ball pressing operation side of the sleeve gradually becomes deeper is formed on the outer peripheral surface of the socket body. A coil ring having a coil diameter larger than the deepest dimension of the annular groove is fitted with shrinkage elasticity, while the inner peripheral surface of the sleeve is prevented from invading by the coil ring fitted in the annular groove. A width substantially equal to the allowable coil diameter;
An annular groove having a depth at least equal to the coil diameter is provided, and the coil ring is fitted into the annular groove so that the sleeve and the coil ring can be moved integrally. A retraction restricting portion is provided to abut on the end of the sleeve from which the presser is released to restrict further movement of the sleeve, and the inclined surface of the annular groove formed on the outer peripheral surface of the socket main body has an inclined surface. A pipe joint wherein the length in the tube axis direction is set such that the coil ring moved integrally with the sleeve is on an inclined surface even when the sleeve is at a position where the sleeve abuts on the retraction restricting portion.