JP2006275112A - Grip ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve high strength (high elastic force) in a grip ring for pipe joint without changing material and a processing condition of material or a heat treatment condition after processing of a grip ring. <P>SOLUTION: Projections 14, 15 for reinforcement whose inner diameters are longer than the biting tooth parts 11, 12, 13, or whose tooth tip positions are withdrawn radially outward from the biting tooth parts 11, 12, 13, are formed along the tooth parts 11, 12, 13 between biting tooth parts 11, 12, 13 of a grip ring 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a grip ring for a pipe joint.

By connecting a pipe made of vinyl chloride resin, etc., used for waterworks and sewers, and extending or bending the pipe joint to the joint body with the socket part and the socket part of the joint body, it is turned in the axial direction. It consists of a ring-shaped movable fastening piece that is movable and cooperates with the socket part to tighten the grip ring together with the gasket. The grip ring is divided in the circumferential direction at one place, and circular with a sawtooth cross section on the inner peripheral surface It has a gripping tooth extending in a ring shape in the circumferential direction, and the gripping tooth bites into the outer peripheral surface of the pipe end by a spring action, and tightens it via a movable fastening piece to deepen it further. 2. Description of the Related Art Conventionally, a pipe that bites into the outer peripheral surface of a pipe end so that the pipe does not come out of the joint even when water pressure or the like is applied (see, for example, Patent Document 1).
JP-T-2001-507782

  In recent years, the grip ring for pipe joints has been desired to have high strength (high elasticity). This is because if the strength (elastic force) increases, the gripping force increases and the tube end can be gripped more reliably, and the wire diameter of the grip ring material can be reduced and the material can be reduced. Because it can. The reduction of materials reduces costs and also protects resources.

  As a means to increase the strength of the grip ring, there is a means to increase the strength by changing the material. Also, the strength by changing the processing conditions (heat treatment temperature, degree of processing, etc.) of the material (wire) and the heat treatment conditions after grip ring processing. There is a means to raise.

  However, if you try to increase the strength by changing the above materials, it is necessary to change the material components, and trial manufacture with various materials with different component systems until you find an appropriate material, evaluate the characteristics of the grip ring one by one. It must be time consuming and expensive. Moreover, even if the processing conditions of the material are changed to increase the strength, the processing conditions that can provide high strength with the current material have already been adopted, and it is difficult to increase the strength further by changing the processing conditions. Even if the strength can be increased by changing the processing conditions, the material becomes hard and the workability decreases, and the processing cost increases due to a decrease in processing speed, a decrease in the life of the insert tool, and the like. Furthermore, if an attempt is made to increase the strength by heat treatment after grip ring processing, the ring diameter of the grip ring changes due to the heat treatment, and subsequent ring diameter correction is costly.

  Therefore, it is a problem to achieve high strength (high elastic force) in the grip ring for pipe joints without changing the material, changing the processing conditions of the material or the heat treatment conditions after the grip ring processing. It is. The present invention aims to solve this problem.

  The grip ring of the present invention is composed of a metal wire having a substantially circular cross section, and is divided in a circumferential direction at one place, and in a circumferential direction with a plurality of cross-sectional sawtooth shapes axially spaced from each other on the inner peripheral surface. A grip ring for a pipe joint having gripping teeth extending in a ring shape, wherein the gripping ring is provided between at least two adjacent gripping teeth along the teeth. A protruding portion having an inner diameter larger than that of the tooth portion for use is formed.

In the grip ring of the present invention, the projecting portion is formed between the holding tooth portions, whereby the cross-sectional area of the grip ring is increased and the strength (elastic force) is increased. Further, considering the same strength, the material diameter of the grip ring can be reduced.
In addition, the grip ring of the present invention can easily increase the strength simply by devising the processing of the tooth portion. Further, an increase in the cutting amount is suppressed, and the holding of the cutter teeth is improved accordingly.

  As is clear from the above description, the grip ring of the present invention has a projecting portion formed between the holding tooth portions, thereby increasing the cross-sectional area of the grip ring and increasing the strength (elastic force). To do. Also, considering the same strength, the material diameter of the grip ring can be reduced.

  In addition, the grip ring of the present invention can easily increase the strength simply by devising the processing of the tooth portion. Further, an increase in the cutting amount is suppressed, and the holding of the cutter teeth is improved accordingly.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 and 2 show an example of an embodiment of the present invention. FIG. 1 is a plan view of a grip ring (a) and its BB cross-sectional enlarged view (b), and FIG. 2 is a perspective view of a pipe joint.

  A grip ring 10 shown in FIG. 1 is a grip ring used for a pipe joint (for example, a pipe joint shown in FIG. 2) for connecting a PVC pipe (vinyl chloride resin pipe) used in, for example, waterworks and sewers. A metal wire having a substantially circular cross section, for example, a stainless steel wire for springs having a wire diameter of 2 to 20 mm (for example, SUS304-WPB according to JIS-G-4314) is used as a material. Note that the material of the grip ring is not limited to this, and the types and uses of pipes and pipe joints are not limited to the above.

  As shown in FIG. 1, the grip ring 10 is divided in the circumferential direction at one place and extends in a ring shape in the circumferential direction with three cross-sectional sawtooth shapes spaced axially from each other on the inner circumferential surface. The tooth portions 11, 12, and 13 are included.

  The holding teeth 11, 12, and 13 face the front side of the pipe end insertion direction (the outside of the pipe joint in the axial direction) so that the pipe end 1 can be easily inserted into the pipe joint and difficult to remove. It is inclined with respect to the axial direction and faces the rear side (inner axial direction of the pipe joint) so as to be substantially perpendicular to the axial direction. The three gripping tooth portions 11, 12, 13 have substantially the same inner diameter, the tooth tip positions are aligned in the radial direction, and the grip ring 10 can be stably gripped on the outer periphery of the pipe end. The arrangement is such that the axial width is substantially full.

  Further, the grip ring 10 is provided between the tooth portions 11, 12, 13 for holding between the three tooth portions 11, 12, 13 of the three strips, along the tooth portions 11, 12, 13. Also, the inner diameter is large, that is, the tooth tip position has reinforcing protrusions 14 and 15 that are retracted radially outward from the tooth parts 11, 12, and 13 for holding. In this case, the reinforcing protrusions 14 and 15 can be cut at a time by simply putting the same cutter teeth and retracting the tip slightly when processing the holding teeth 11, 12, and 13. However, the shape of the projecting portions 14 and 15 for reinforcement is not limited to this, and is a thread-like or other projecting portion having a larger inner diameter along the tooth portions 11, 12 and 13 for holding. There may be. And the number of the protrusion parts for a reinforcement is not restricted to 1 item | stripes, A multiple item | stripes may be sufficient.

  The pipe joint 20 shown in FIG. 2 has a joint body 22 having socket portions 21 at both ends of a straight pipe or a curved pipe, and is movable in the axial direction by rotating with respect to the socket portion 21 of the joint body 22. 21 and a ring-shaped movable fastening piece 24 that fastens the grip ring 10 together with the gasket 23.

  The socket portion 21 has a small-diameter cylindrical portion 21a having a stepped bottom so that the tube end portion 1 can be inserted and seated, and the inner surface of the small-diameter cylindrical portion 21a is inclined to form a gasket seat. A conical portion 21b having a functioning conical surface and a distal end of the conical portion 21b are provided, and the movable fastening piece 24 is placed so as to be movable in the rotational direction and the axial direction. And a large-diameter cylindrical portion 21c that can be held at the moving position.

  The gasket 23 is placed on the inclined inner surface of the socket portion 21 and is pushed in by the end surface of the movable fastening piece 24.

  The breech lock mechanism corresponds to a plurality of outer lock segments 25 having inclined end surfaces on the inner side in the axial direction and spaced apart from each other on the inner periphery of the large-diameter cylindrical portion 21c of the socket portion 21. And a plurality of inner lock segments 26 having inclined end surfaces on the outer side in the axial direction, which are provided apart from each other on the outer periphery of the movable fastening piece 24. The inner lock segment 26 and the outer segment 25 are formed on the inclined end surfaces. The movable fastening pieces 24 are held in a desired axial movement position in accordance with the rotational position with respect to the socket portion 21.

  The movable fastening piece 24 is provided with a rotating handle 27 protruding outward in the radial direction. A handle 28 that cooperates with the handle 27 of the movable fastening piece 24 has a large diameter of the socket portion 21 of the joint body 22. It is provided in the cylindrical portion 21c.

  In addition, a rectangular cutout 29 is provided on one side in the circumferential direction adjacent to the handle 28 in the large-diameter cylindrical portion 21 c of the socket portion 21 of the pipe joint body 22. The handle 27 of the movable fastening piece 24 fits into the rectangular notch 29 of the large-diameter cylindrical portion 21c of the socket portion 21 and protrudes radially outward. The end face of the rectangular notch 29 and the large-diameter cylindrical portion 21c It can move in the rotational direction between the handle 28.

  Further, the movable fastening piece 24 is provided with an annular cavity portion 30 which is inserted into the inner peripheral portion adjacent to the handle 27 and is inclined so that the inner diameter becomes smaller toward the outer side in the axial direction. The movable fastening piece 24 is provided with a through hole 32 into which the locking piece 31 can be inserted at a portion of the annular cavity 30 having the maximum inner diameter and adjacent to the handle 27, and from the through hole 32. A rib 33 for hooking one end of the grip ring 10 is provided at a predetermined position on the inner circumferential surface slightly apart in the circumferential direction.

  The movable fastening piece 24 is positioned so that the handle 27 is close to the end face of the rectangular notch 29 on the side away from the handle 28 of the socket portion 21 before the tube end portion is inserted, and penetrates the locking piece 31 in that state. The other end of the grip ring 10 inserted into the hole 32 and having one end locked by the rib 33 is hooked by the locking piece 32 and expanded. Then, the locking piece 32 is fixed to the handle 27 of the movable fastening piece 24 with bolts 34 and nuts 35. Thus, the grip ring 10 is held in the expanded state. In this state, the tube end 1 is inserted.

  After the tube end 1 is inserted in this way, when the bolt 34 is removed and the locking piece 31 is removed, the grip ring 10 has the gripping teeth 11, 12, 13 as shown in FIG. Bite into the outer peripheral surface of the end portion of the tube 3 by a spring action. When the movable fastening piece 24 is rotated toward the handle 28 of the socket portion 21 with the handle 27, the movable fastening piece 24 is pulled into the socket portion 21 by the breech lock mechanism, thereby compressing the gasket 23. The grip ring 10 moves in the annular cavity 30 of the movable fastening piece 24 to the side having a smaller inner diameter and is tightened, so that the holding tooth portions 11, 12, 13 are deeper in the outer peripheral surface of the pipe end 1. Bite. Further, when water pressure or the like is applied after the piping, the grip ring 10 is dragged toward the pipe end 1 that is about to be pulled outward, and the grip ring 10 moves to the side having a smaller inner diameter in the annular cavity 30, so that the holding tooth portion 11, 12, and 13 bite further and the pipe end 1 is prevented from being detached.

It is the top view (a) and its BB cross-sectional enlarged view (b) of the grip ring of an example of embodiment of this invention. It is a perspective view of the pipe joint using the grip ring of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe end part 10 Grip ring 11, 12, 13 Holding tooth part 14, 15 Reinforcing protrusion part 20 Pipe joint

Claims (1)

It is made of a metal wire having a substantially circular cross section, and is divided in the circumferential direction at one location and is held in a ring shape in the circumferential direction with a plurality of cross-sectional sawtooth shapes spaced axially from each other on the inner peripheral surface. A grip ring for a pipe joint having a tooth portion of
A reinforcing protruding portion having an inner diameter larger than that of the holding tooth portion is formed between at least two adjacent holding tooth portions along the tooth portions. Grip ring.

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