JP3028226B1 - Pipe fittings - Google Patents

Abstract

An object of the present invention is to provide a pipe joint that reliably prevents disconnection due to an erroneous operation of a socket and a plug during connection, and effectively prevents an unexpected accident. SOLUTION: A cylinder having a cylindrical socket 1 in which a lock ball 3 is loosely fitted and held via a taper hole 2, and a lock ball engaging annular groove 17 which can be inserted into the socket 1 freely. In the pipe joint consisting of the plug 16, a lock piece 6 of a required length is provided at the base end of the first sleeve 4 constituting the socket 1 so as to be slidably movable inward and is slidable. 6 to stop socket 6 in place
A stopper piece 8 protrudes from the outer peripheral surface, and a locking piece escape portion 10 is provided between the stopper piece 8 and the socket 1.
The lock piece 6 is brought into contact with the stopper piece 8 to lock the first sleeve 4, and the lock piece 6 is pressed and moved inward and released to the escape portion 10 to release the lock. It is configured as follows.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint and, more particularly, to a pipe joint which can be locked at the time of connection to prevent accidental disconnection.

[0002]

2. Description of the Related Art Conventional pipe joints include a tubular socket in which a lock ball is loosely fitted and held through a tapered hole, and a lock ball locking ring which can be inserted into and removed from the socket. A first plug for holding a lock ball is slidably fitted to the leading end of the socket via a spring at the leading end of the socket, and a leading end of the first sleeve is provided. It is known that a second sleeve having a lock ball escape portion at its tip is slidably fitted to the portion.

[0003] In the pipe joint constructed as described above, when connecting the socket and the plug, the plug is inserted into the socket, the lock ball is pressed, and the first ball is pressed.
After engaging with the annular groove of the insertion plug while moving backward with the sleeve, the first force is applied by the urging force of the spring.
The sleeve is returned to its original state, and the lock ball is pressed and supported together with the second sleeve to be connected. Conversely, when the connection between the plug and the socket is released, the first sleeve is caused to retreat against the urging force of the spring by moving the second sleeve backward, and the lock board is moved.
In addition to releasing the pressing support of the second sleeve, it escapes to the escape portion of the second sleeve to release the engagement with the annular groove to release the connection.

[0004]

By the way, the pipe joint constructed as described above can be easily connected only by inserting the plug into the socket against the urging force of the spring. Since the connection can be easily released by moving the valve back, the connection may be disconnected due to an erroneous operation or carelessness, and an unexpected situation may be caused.

[0005] The present invention solves the problems of the conventional pipe joint, reliably prevents disconnection due to an erroneous operation of the socket and the plug during connection, and effectively prevents unexpected accidents. It is intended to provide a pipe fitting that can be used.

[0006]

That is, according to the present invention, a cylindrical socket 1 in which a lock ball 3 is loosely fitted and held through a tapered hole 2 and is freely insertable into the socket 1. The socket 1 has a cylindrical plug 16 having an annular groove 17 for engagement with a lock ball. A first sleeve 4 for holding the lock ball is slidably fitted to the leading end of the socket 1 via a spring 5. In addition, in the pipe joint, the first sleeve 4 is provided with a second sleeve 13 slidably fitted at the tip of the first sleeve 4 having a lock ball relief 15 at the tip. Three
A lock piece 6 of a required length is provided at the base end of the bush 4 so as to be slidably movable inward, and a stopper piece 8 is provided on the outer peripheral surface of the socket 1 so as to stop the lock piece 6 at a predetermined position.
And a lock piece escape portion 10 is formed between the stopper piece 8 and the socket 1 so that the lock piece 6 abuts on the stopper piece 8 and the first sleeve 4 And the lock piece 6 is configured to be released to the escape portion 10 to release the lock while pressing the lock piece 6 inward and moving inwardly, thereby unlocking the pipe joint.

In the pipe joint according to the present invention, when an external force acts to retreat the second sleeve 13 at the time of connection, the lock piece 6 comes into contact with the stopper piece 8, and the first and second locks come into contact with each other. The retreating operation of the two sleeves 4 and 13 is restrained within a certain range and locked, and accidental disconnection between the socket 1 and the plug 16 is reliably prevented. To release the lock, the lock piece 6 is pressed and moved inward and released to the escape portion 10 to release the lock.

[0008]

Embodiments of the present invention will be described below with reference to an embodiment shown in the drawings. 1 is a cylindrical socket having a small-diameter tip, and 2 is a socket 1
A required number of elongated tapered holes 3 provided at equal intervals at the distal end of the tapered lock holes 3 are loosely fitted and held in the respective tapered holes 2 while partially projecting inward from the socket 1. Reference numeral 4 denotes a first sleeve for holding a lock ball, which is slidably fitted on the outer periphery of the front end portion of the socket 1 via a spring 5, and 6 denotes a base of the first sleeve 4. A pair of locking pieces 7 on both sides having a required length and extending to the end portion are pressing projections formed on the locking pieces 6, and the locking pieces 6 are respectively expanded outwardly. By pressing the projection 7, it is movable inward.

Reference numeral 8 denotes a stopper piece protruding through an annular portion 9 on the outer peripheral surface of the socket 1 so as to abut and lock each of the lock pieces 6, and the position of the stopper piece 8 is the first.
The sleeve 4 is located ahead of the retreat dead center. Reference numeral 10 denotes an escape portion for a lock piece formed between the stopper piece 8 and the socket 1, reference numeral 11 denotes a hose receiving portion screwed to a base end portion of the socket 1, and reference numeral 12 denotes a hose receiving portion 11. A required valve body (not shown) is provided inside the hose receiving portion 11.

Reference numeral 13 denotes a second sleeve slidably fitted on the outer periphery of the leading end of the first sleeve 4, and reference numeral 14 denotes a second sleeve.
An annular stopper 15 formed at the leading edge of the socket 1 for stopping the sleeve 13 at a predetermined position is an escape portion for a lock ball formed at the leading edge of the second sleeve 13.

Reference numeral 16 denotes a cylindrical plug which can be inserted into the socket 1 in an airtight manner, reference numeral 17 denotes an annular groove formed on the outer periphery of the front end of the plug 16 for engaging a lock ball, and reference numeral 18 denotes the plug 1.
6 is a connecting portion such as a hose formed at the rear end.

Next, the operation of the embodiment configured as described above will be described. First, when connecting the plug 16 to the socket 1, the plug 16 is inserted into the socket 1, and the lock ball 3 is pressed against the urging force of the spring 5, and the long tapered tape hole 2 is formed. Along the first sleeve 4
And retreat together. At this time, the lock piece 6 is in a free state without abutting on the stopper piece 8, and the second sleeve 13 is kept in the original state without retreating. When the annular groove 17 of the plug 16 reaches the retracted position of the lock ball 3, the lock ball 3 is engaged in the annular groove 17 and the first sleeve 4 is moved forward by the urging force of the spring 5. Then, the lock ball 3 is pressed together with the second sleeve 13 in the direction of the annular groove 17 to connect them (see FIG. 2). At this time, the lock piece 6 is in a free state without contacting the stopper piece 8, but when an external force acts on the second sleeve 13, the lock piece 6 retreats together with the first sleeve 4, and the required retreat is performed. At this position, the stopper piece 8 comes into contact with the stopper piece 8 to be locked, thereby stopping the retreating operation of the first and second sleeves 4 and 13 (see FIG. 3).

Conversely, to release the connection between the socket 1 and the plug 16, the second sleeve 13 is moved backward together with the first sleeve 4 against the urging force of the spring 5, and the projection 7 The lock piece 6 is pressed inward through the through-hole, and the lock is released from the stopper piece 8 to release the escape portion 10.
Let go. When the first sleeve 4 reaches the retreat dead center, the pressing of the lock ball 3 by the first and second sleeves 4 and 13 is released, and the lock ball 3 is released from the second sleeve 13. It is better to release the plug 16 by releasing it to the escape portion 15 to release the engagement with the annular groove 17 (see FIG. 4).

In the above embodiment, two lock pieces 6 are formed at the base end of the first sleeve 4 so as to face each other. However, if necessary, the number of lock pieces 6 may be increased or decreased. Of course, in this case, the number of the stopper pieces 8 and the escape portions 10 corresponding to the number of the lock pieces 6 are of course formed.

[0015]

Since the present invention is constructed as described above, when an external force acts to retreat the second sleeve 13 when the socket 1 and the plug 16 are connected to each other, the external force acts on the second sleeve 13.
The locking piece 6 comes into contact with the stopper piece 8 so that the first and second sleeves 4 and 13 can be prevented from retreating and locked, and thus the socket 1 and the plug 16 can be unexpectedly locked. Can always be reliably prevented from being disconnected. Also, in releasing the connection between the socket 1 and the plug 16, the lock piece 6 can be easily released by pressing the lock piece 6 inward and moving it to escape to the escape portion 10.

[Brief description of the drawings]

FIG. 1 shows a socket 1 and a plug 1 according to an embodiment of the present invention.
6 is a perspective view of FIG.

FIG. 2 is a cross-sectional view showing a state where the socket 1 and the plug 16 are connected.

FIG. 3 is a cross-sectional view showing a state in which a lock piece 6 is in contact with a stopper piece 8 and locked.

FIG. 4 is a perspective view of the socket 1 after the lock by the lock piece 6 is released.
FIG. 4 is a cross-sectional view showing a state in which the connection between the plug and the plug 16 is disconnected.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 socket 2 taper hole 3 lock ball 4 first sleeve 5 spring 6 lock piece 8 stopper piece 10 lock piece relief section 13 second sleeve 15 lock ball relief section 16 plug 17 annular groove

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-10-185056 (JP, A) JP-A-10-2474 (JP, A) Jiko 56-16447 (JP, Y2) (58) Survey Field (Int.Cl. ⁷ , DB name) F16L 37/23

Claims (1)

(57) [Claims] 1. A cylindrical socket 1 in which a lock ball 3 is loosely fitted and held through a taper hole 2, and an annular groove 17 for lock ball engagement, which is freely insertable into the socket 1. A first sleeve 4 for holding a lock ball is slidably fitted to the front end of the socket 1 via a spring 5 at the tip of the socket 1, and the first sleeve 4 Has a lock ball relief portion 15 at the tip of the second portion.
In a pipe joint in which a sleeve 13 is slidably fitted, a lock piece 6 of a required length is provided at the base end of the first sleeve 4 so as to be slidably movable inwardly. In order to stop the lock piece 6 at a predetermined position, a stopper piece 8 is projected from the outer peripheral surface of the socket 1, and a lock piece escape portion 10 is provided between the stopper piece 8 and the socket 1. In order to lock the first sleeve 4 by contacting the lock piece 6 with the stopper piece 8 and release the lock piece 6 to the escape portion 10 while pressing and moving the lock piece 6 inward, the lock is released. A pipe joint characterized by being constituted.