JP2014163392A - Lock ball type joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and surely perform the operation of a lock ball to be a key for performing connection and detachment of a tubular member.SOLUTION: A lock ball type joint includes: a joint body 2 into which a pipe P is inserted; a slide sleeve 3 that is fitted to the outer periphery of the joint body 2; a coil spring 4 that is interposed between the slide sleeve 3 and the joint body 2, and biases the slide sleeve 3 to a pipe insertion side; a lock ball 6 that can protrude into a plurality of long holes 5 formed at a part close to a pipe insertion side end part in the joint body 2 through the slide sleeve 3; and a stationary sleeve 7 that is mounted on the pipe insertion side end part in the outer periphery of the joint body 2, and into which the pipe insertion side end part of the slide sleeve 3 is fitted.

Description

  The present invention relates to a lock ball type pipe joint that connects pipes via a lock ball.

  Conventionally, as a pipe joint for connecting and disconnecting a tubular member using a lock ball, a cylindrical shape having a through hole drilled in a side surface and a ball receiving piece projecting from one end along the central axis direction A socket body, a spherical lock ball, a lock sleeve having a ball retaining piece that is sandwiched and slid between the cylindrical socket body and the ball receiving piece and abuts against the lock ball, and the cylindrical socket A sliding socket externally fitted along the central axis direction of the main body and having a ball pressing piece for locking the lock ball; and a first elastic body for moving the lock sleeve along the central axis direction; A holder body that abuts and is fixed to the cylindrical socket body, an annular groove that is recessed to engage the lock ball, and a projection that is provided so that the lock ball rides up. By inserting a plug having a projection portion into the cylindrical socket body, the ball of the lock sleeve and the ball of the sliding socket are pressed while the lock ball presses the ball piece of the lock sleeve. The gap between the holding piece and the plug projecting portion is overcome, engaged with the annular groove of the plug, and pushed back by the first elastic body. A ball pressing piece, a plug projection and a connecting means for connecting the cylindrical socket body and the plug by being locked by one end of the cylindrical socket body, and sliding the sliding socket in the direction of the holder body By doing so, the lock ball is released from the locking of the ball retaining piece of the lock sleeve and the ball pressing piece of the sliding socket. It overcame plug projections, having a release means and said cylindrical socket body and the plug by being disengaged from the annular groove of the plug are known.

JP 2012-31956 A

  However, in the case of the above-described pipe joint, in order to operate a lock ball that is a key for connecting and disconnecting the plug, a ball receiving piece is protruded from the socket and a ball pressing piece is provided to the sliding socket, Since it is necessary to form a ball retaining piece on the lock sleeve, the structure of each member is complicated, and problems are likely to occur due to molding errors, and the number of parts as a whole of the fittings is large. There was a problem that it took. In general, in this type of pipe joint, it is necessary to form a fitting groove that is somewhat deep in the outer peripheral surface of the pipe in order to ensure the connection strength with the pipe.

  An object of the present invention is to provide a pipe joint capable of easily and surely operating a lock ball as a key for connecting and removing a tubular member.

  According to the first aspect of the present invention, there is provided a tubular joint body into which a pipe is inserted from one end, a slide sleeve fitted over a central portion of the outer circumference of the joint body, and the slide sleeve and the joint body outer circumference. A plurality of coil springs that are interposed between the formed protrusions and bias the slide sleeve toward the pipe insertion side, and are formed at predetermined intervals in the circumferential direction of the joint main body near the end of the pipe insertion side. A through-hole, a substantially arc-shaped recess formed at the pipe insertion side end of the slide sleeve corresponding to the through-hole, and held in the substantially arc-shaped recess and projecting from the through-hole of the joint body by the movement of the slide sleeve A fixed sleeve having a free lock ball and a fixed sleeve that is fitted to the pipe insertion side end of the outer periphery of the joint body and into which the pipe insertion side end of the slide sleeve is fitted; The inner peripheral surface is a lock ball type pipe joint inclined portion to guide the lock ball to the joint body inwardly to face the through hole of the sliding sleeve is formed.

According to a second aspect of the present invention, the pipe joint according to the first aspect is detachably attached to the outer periphery of the joint body adjacent to the end of the slide sleeve opposite to the pipe insertion side. It further has a stopper ring to be regulated.

  The lock ball type pipe joint according to the present invention can basically be configured with a small number of parts compared to the prior art such as a joint main body, a slide sleeve, a fixed sleeve, a coil spring and a lock ball, and the connection of the pipe is a slide. It has the special advantage that it can be done simply by moving the sleeve. In addition, in the pipe connection state, as described above, the lock ball is guided inwardly of the joint body by the inclined portion of the inner peripheral surface of the fixed sleeve, and a strong pressure contact with the outer peripheral surface of the pipe by the lock ball is realized. It is not necessary to provide a deep fitting groove on the outer peripheral surface of the pipe as in the past, and a strong connection can be made even with a shallow fitting groove. Have advantages.

  Moreover, in the pipe joint of the present invention having the stopper ring that restricts the movement of the slide sleeve, unintentional movement of the slide sleeve after pipe connection can be reliably prevented.

It is a disassembled perspective view of the pipe joint which concerns on embodiment of this invention. It is a longitudinal cross-sectional view which shows the state before pipe insertion in the pipe joint. In the same pipe joint, it is a longitudinal section showing the state of the initial stage of pipe insertion. In the same pipe joint, it is a longitudinal section showing a state where a pipe is completely connected. In the same pipe joint, it is a longitudinal section showing a state where a lock ball is held in an arcuate recess of a slide sleeve. It is a longitudinal cross-sectional view which shows the state at the time of a pipe being extracted in the same pipe joint.

  Next, although embodiment of this invention is described according to drawing, this invention is not limited to this embodiment.

  As shown in FIGS. 1 and 2, a pipe joint 1 includes a cylindrical joint body 2 into which a pipe P is inserted from one end, and a slide sleeve fitted over a central portion of the outer circumference of the joint body 2. 3, a coil spring 4 that is interposed between the slide sleeve 3 and the protrusion 2 a formed on the joint body 2, and biases the slide sleeve 3 toward the pipe insertion side, and the pipe insertion side end 2 b of the joint body 2. A lock ball 6 which can be freely protruded by a slide sleeve 3 in four through holes 5 formed in the part, and a pipe insertion side end 2b on the outer periphery of the joint body 2, are attached to the pipe insertion side end of the slide sleeve 3. A fixed sleeve 7 into which the portion 3a is fitted, and an end portion 3b opposite to the pipe insertion side of the slide sleeve 3 are detachably attached to the annular protrusion 2c on the outer periphery of the joint body 2. It is, and a stopper ring 8 for restricting the movement of the slide sleeve 3 (see FIG. 3). The through hole 5 is a long hole in this embodiment.

  In the present embodiment, the pipe insertion side refers to the side where the pipe P is inserted, and in FIG. 2, it means the left end side of the pipe joint 1. On the other hand, the side opposite to the pipe insertion side refers to the opposite side of the side where the pipe P is inserted, and in FIG. 2 means the right end side of the pipe joint 1.

As shown in FIGS. 1 and 2, the joint body 2 has a step 2d formed in the circumferential direction in addition to the protrusion 2a on the outer periphery of the central portion of the length, and the through hole 5 is also circular. Four are formed at regular intervals in the circumferential direction, and a retaining ring 11 is attached to the small groove 9 on the outer peripheral surface of the pipe insertion side end of the joint body 2 to attach the fixing sleeve 7 to the pipe insertion side. O-rings 31 are respectively fitted in two adjacent grooves 10 on the inner peripheral surface of the opposite end.

The slide sleeve 3 has a flange 20 at an end portion 3b opposite to the pipe insertion side, and a step portion 21 that engages with the fixed sleeve 7 is formed on the pipe insertion side portion from the step portion 21 to the pipe insertion side. A tapered portion 3c is provided toward the end, and a substantially arcuate recess 3d that holds the lock ball 6 is formed in the tapered portion 3c. Four substantially arc-shaped recesses 3 d are formed at regular intervals in the circumferential direction of the tapered portion 3 c corresponding to the through holes 5 and the lock balls 6 in the joint body 2.

  The fixed sleeve 7 is fixed between the retaining ring 11 and the stepped portion 21 of the slide sleeve 3, and is in contact with the lock ball 6 while facing the substantially arc-shaped recess 3 d of the slide sleeve 3 on the inner peripheral surface. The inclined portion 12 is formed to guide the inside of the joint body inward.

  The stopper ring 8 is C-shaped when viewed from the front, and is detachably engaged between the annular projection 2c and the projection 2a on the outer periphery of the joint body 2. When the pipe P is connected, the slide sleeve 7 is The movement to the side opposite to the pipe insertion side is prevented. The stopper ring 8 has a curved plate-shaped knob 8a at the center in the circumferential direction.

  A shallow groove G is formed on the outer peripheral surface of the pipe P, and the shallow groove G is provided so that the lock ball 6 is press-fitted when the pipe P is connected to the joint body 2.

  Next, the procedure for connecting and removing the pipe P in the pipe joint 1 according to the present embodiment will be described. As shown in FIG. 2, before the pipe P is inserted, a stopper that is mounted on the joint body 2 in advance. With the ring 8 removed, the slide sleeve 3 moves to the pipe P insertion side by the elastic force of the coil spring 4, and the lock ball 6 in the arc-shaped recess 3 d of the slide sleeve 3 is inserted into the through hole 5 of the joint body 2. It is in a state protruding from.

  As shown in FIG. 3, when the pipe P is inserted into the joint body 2, the lock ball 6 comes into contact with the tip of the pipe P and is moved to the outer peripheral side of the joint body 2. Accordingly, the slide sleeve 3 moves to the opposite side (arrow A direction) from the pipe insertion side against the elastic force of the coil spring 4.

As shown in FIG. 4, when the pipe P enters the joint body 2 to a predetermined position, the insertion of the pipe P is stopped, so that the slide sleeve 3 is moved to the original position by the elastic force of the coil spring 4. The lock ball 6 abuts against the inclined portion 12 on the inner periphery of the fixed sleeve 7 and is guided inward of the joint body 2, and the lock ball 6 is press-fitted into the shallow groove G of the pipe P along with this. Thus, the lock ball 6 is in a state of being caught between the pipe P and the fixed sleeve 7, and thereby the pipe P is firmly connected in the pipe joint 1. Thereafter, by attaching the stopper ring 8 to the joint body 2, the movement of the slide sleeve 3 is restricted, the connection state of the pipe P described above is reliably maintained, and the pipe P does not come off arbitrarily.

  Next, the procedure for removing the pipe P will be described. First, as shown in FIG. 5, the stopper ring 8 is removed and the slide sleeve 3 is against the elastic force of the coil spring 4 on the side opposite to the pipe insertion side (arrow). (The direction A), the lock ball 6 in the substantially arc-shaped recess 3d moves in the same direction while being held in the substantially arc-shaped recess 3d. The ball 6 is pulled up toward the outer surface of the joint body 2, and as a result, the press-fitting of the lock ball 6 into the shallow groove G in the pipe P is released.

  Then, as shown in FIG. 6, the pipe P can be removed by simply pulling the pipe P in the above state in the direction opposite to the insertion direction (arrow B direction).

  The pipe joint of the present invention can be easily assembled with fewer parts than before, and the pipes can be connected easily and reliably, and the pipe can be easily removed as described above. Can be used.

DESCRIPTION OF SYMBOLS 1 Pipe joint 2 Joint main body 3 Slide sleeve 3d Substantially circular-arc-shaped recess 4 Coil spring 5 Through-hole 6 Lock ball 7 Fixed sleeve 12 Inclined part

Claims (2)

  It is interposed between a cylindrical joint body into which a pipe is inserted from one end, a slide sleeve fitted over the central portion of the outer circumference of the joint body, and a protrusion formed on the slide sleeve and the joint body outer circumference. A coil spring for urging the slide sleeve toward the pipe insertion side, a plurality of through holes formed at predetermined intervals in the circumferential direction of the portion near the end of the pipe insertion side of the joint body, and the through holes. A substantially arc-shaped recess formed at the pipe insertion side end of the slide sleeve, a lock ball that is held in the substantially arc-shaped recess and can be protruded from the through hole of the joint body by the movement of the slide sleeve, and the joint body A fixed sleeve that is fitted to the pipe insertion side end of the outer periphery and into which the pipe insertion side end of the slide sleeve is fitted. Inclined portions that induce locking ball to the joint body inwardly to face the substantially arcuate recess of the probe is formed, the lock ball type pipe joint.   The lock ball type according to claim 1, further comprising a stopper ring that is detachably mounted on the outer periphery of the joint main body adjacent to the end of the slide sleeve opposite to the pipe insertion side, and that restricts the movement of the slide sleeve. Pipe fittings.

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