JPH0628473U - Lock ring for separation prevention fitting - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a lock ring that is easily disassembled in a slip-on type separation prevention pipe joint. [Structure] In the one-divided portion of the one-divided lock ring 14, a thin portion 15 is formed by cutting the inner peripheral portion by an appropriate thickness from the tip portion to an appropriate length. When dismantling, insert the thin plate into the gap between the receiving port and the insertion port and lock ring 1
When 4 is expanded, it is possible to prevent the hanging portion of the tip portion of the one-divided portion and the insertion opening projection from being caught.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lock ring used in a slip-on type separation prevention pipe joint.

[0002]

[Prior art]

 As one of the rights of the pipe joint, the receiving end is formed at the end of one pipe to be joined to each other, and the receiving end to be inserted into the receiving end is formed at the end of the other pipe. There is a slip-on type pipe joint in which an annular sealing material is compressed between the inner peripheral surface of the and the outer peripheral surface of the insertion port. FIG. 3 is a sectional view showing an example of such a slip-on type separation prevention pipe joint.

In FIG. 3, reference numeral 1 is a receiving port formed at one end of the pipes fitted to each other, and 2 is an insertion port formed at the end of the other pipe. An annular groove 4 for a sealing material for accommodating the sealing material 3 is provided on the inner surface of the receiving opening 1 on the receiving opening side, and a ring-shaped lock ring 5 for receiving one is provided on the inner side of the receiving opening. An annular groove 6 for the lock ring is formed respectively. The annular groove 6 for the lock ring is formed wider than the width of the housed lock ring 5 in the pipe axis direction, and the bottom surface of the groove is a large-diameter flat inner peripheral surface 7 formed on the inner side of the receiving port and this flat inner peripheral surface. The flat inner peripheral surface 7 is provided with a rubber ring 9 which has a tapered surface 8 whose diameter gradually decreases from the surface 7 toward the receiving opening side.

The split annular lock ring 5 accommodated in the annular groove 6 for the lock ring is crimped to the rubber ring 9 at the position of the rubber ring 9 to be reduced in diameter, and the inner peripheral surface thereof is inserted. It is pressed against the outer peripheral surface of 2, and its rear end edge on the receiving opening side and the front end edge on the receiving opening back side can respectively contact the tapered surface 8 of the annular groove 6 for the lock ring and the receiving end side end surface. Further, a taper surface 10 is formed on the inner peripheral edge of the lock ring 5 on the side of the receiving opening, and the diameter gradually increases toward the receiving opening side. In addition to facilitating the passage of the mouth protrusion 11, the rear end of the mouth protrusion 11 engages with the end surface of the lock ring 5 on the rear side of the mouth to prevent the mouth 2 from coming off when the mouth 2 is pulled out. To do.

When joining the separation preventing pipe joint configured as described above, first, the rubber ring 9 is inserted into the receiving port 1 and then the flat inner peripheral surface 7 of the annular groove 6 for the lock ring of the receiving port 1 is inserted. Then, the lock ring 5 is reduced in diameter by using a diameter reducing jig (not shown) that engages with the diameter reducing hole 5a formed in the divided portion as shown in FIG. The lock ring 5 having the reduced diameter is released at the position of the rubber ring 9, and the lock ring 5 is opened and attached to the rubber ring 9. Next, the sealing material 3 is inserted into the receiving opening 1 and fitted into the annular groove 4 for the sealing material, and then the insertion opening 2 is inserted through the sealing material 3. Then, the insertion opening projection 11 of the insertion opening 2 is engaged with the tapered surface 10 of the lock ring 5 to push the lock ring 5 against the rubber ring 9 and spread it out, and the passage of the insertion opening projection 11 is permitted. Thereafter, the rubber ring 9 presses the inner peripheral surface of the lock ring 5 against the outer peripheral surface of the insertion slot 2 to complete the joining. When the insertion opening 2 is pulled out, the rear end of the insertion opening projection 11 engages with the end surface of the lock ring 5 on the rear side of the reception opening, and then the rear end edge of the lock ring 5 on the reception opening side is locked. It engages with the tapered surface 8 of the annular groove 6 for ringing, further reduces the diameter of the lock ring 5 and presses it against the outer peripheral surface of the insertion opening 2 to ensure the engagement with the insertion projection 11 and to secure the insertion opening 2 Prevent withdrawal.

When dismantling the slip-on type separation prevention pipe joint, the following operation is performed. As shown in FIG. 4, the thin plates 12 are inserted, for example, from six locations in the circumferential direction through the gaps between the receiving opening 1 and the insertion opening 2, and the lock ring 5 is spread out against the rubber ring 9 via the tapered surface 10, The thin plate 12 is inserted until its tip comes into contact with the rear end of the insertion projection 11. At this time, the thickness of the thin plate 12 is set so that the upper surface of the thin plate 12 and the upper surface of the insertion protrusion 11 are flush with each other. Next, as shown in FIG. 5, when the insertion opening 2 is pulled out, the lock link 5 pushed out from the thin plate 12 moves from the upper surface of the thin plate 12 to the upper surface of the insertion opening projection 11, and the The insertion opening 2 is pulled out and disassembled without the end engaging the end surface of the lock ring 5 on the inner side of the receiving opening.

[0007]

[Problems to be solved by the device]

 However, at this time, at the circumferential position where the thin plate 12 is inserted, the lock ring 5 is surely pushed out by the height of the insertion opening projection 11, but the thin plate 12 is positioned at the one-part portion of the lock ring 5. If not, the tip of the split portion of the lock ring 5 is pushed down by the pressing force of the rubber ring 9 to form a hanging portion 13 as shown in FIG. 6, and the insertion opening 2 of the lock ring 5 is formed at this portion. The height from the outer surface of the insertion opening 11 becomes lower than the projection height of the insertion opening projection 11, and when the insertion opening 2 is pulled out, the hanging portion 13 may be caught by the insertion opening projection 11 and cannot be disassembled.

The present invention solves the above problem, and when a thin plate is inserted to push the lock ring apart, the tip of the split portion of the lock ring does not get caught in the insertion opening protrusion. The purpose of the present invention is to provide a lock ring for the separation prevention joint.

[0009]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the lock ring for a separation prevention pipe joint of the present invention is made thin by cutting off the wall thickness of the inner peripheral portion of the vicinity portion including the opposing tip portions at the split portion. It is a thing.

[0010]

[Action]

 With the above structure, when the thin plate is inserted between the insertion port and the receiving port and the lock ring is pushed open, even if the tip of the split portion of the lock ring hangs down as in the conventional case, this Since the wall thickness of the inner peripheral part of the part is cut off, it is possible to pull out the insertion opening without being caught in the insertion opening projection.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the lock ring 14 is formed into a thin wall portion 15 by cutting the inner peripheral portion of the lock ring 14 at an appropriate length from the tip end portion to an appropriate length. There is. Therefore, when the pipe joint is dismantled, as shown in FIG. 6, when the thin plate 12 is inserted into the gap between the insertion port and the receiving port and the lock ring 14 is expanded, the thin portion of the lock ring 14 is divided. Even if the tip of the wall portion 15 is pushed down by the pressing of the rubber ring and hangs down, since the thickness of the inner peripheral portion is cut off in the thin portion 15, there is no risk of this portion getting caught in the insertion opening protrusion. This facilitates disassembly of the pipe joint.

[0012]

[Effect of device]

 As described above, according to the present invention, when dismantling the separation prevention pipe joint, by inserting a plurality of thin plates in the circumferential direction into the gap between the receiving port and the insertion port, the lock ring is expanded and expanded. When the lock ring and the insertion port protrusion are made thin by cutting the inner peripheral thickness of the tip of the split portion of the lock ring that is easily caught by the insertion port protrusion, This has made it easier to disassemble the pipe joint.

[Brief description of drawings]

FIG. 1 is a front view of a lock ring for a separation prevention pipe joint according to an embodiment of the present invention.

FIG. 2 is a front view of a conventional lock ring for a separation prevention pipe joint.

FIG. 3 is a cross-sectional view showing an example of a slip-on type separation prevention pipe joint.

FIG. 4 is a cross-sectional view showing a state in which a thin plate is inserted into a gap between a receiving port and an insertion port of the separation prevention pipe joint and the lock ring is pushed open.

FIG. 5 is a cross-sectional view showing a state in which the removal prevention pipe joint is disassembled by pulling out an insertion port in a direction of an arrow from the state of FIG. 4;

FIG. 6 is a front view of relevant parts for explaining a state in which disengagement prevention pipe joint cannot be disassembled during disassembly.

[Explanation of symbols]

 1 Receptacle 2 Inlet 6 Ring groove for lock ring 9 Rubber ring 11 Outlet protrusion 12 Thin plate 14 Lock ring 15 Thin portion

Claims (1)

[Scope of utility model registration request] 1. A separation prevention pipe joint, characterized in that, in the one-divided portion of the one-divided lock ring, a wall thickness of an inner peripheral portion of a vicinity portion including opposed tip portions is cut off to be thin. Rock ring.