JP5778386B2 - Lock ring for pipe joint, pipe joint, and manufacturing method of lock ring for pipe joint - Google Patents

Description

  The present invention relates to a lock ring for a pipe joint, a pipe joint, and a manufacturing method of the lock ring for a pipe joint, and more particularly to a lock ring for a pipe joint and a pipe joint that prevent the pipe inserted into the pipe joint from coming out. And a method of manufacturing the lock ring for a pipe joint.

  2. Description of the Related Art Conventionally, a pipe joint that can connect a pipe to an insertion hole of a joint body by a one-touch operation and detach the pipe is generally used.

  In such a pipe joint, a lock ring is disposed inside the insertion hole, and a claw is formed on the inner peripheral side of the lock ring. And the detachment | leave from the insertion hole of a pipe is suppressed by the nail | claw of a lock ring biting into the outer peripheral surface of the resin-made pipe inserted in the insertion hole (for example, refer patent document 1). However, in the pipe joint described in Patent Document 1, it is conceivable that the amount of the claw of the lock ring that bites into the pipe becomes excessive.

  Patent Document 2 discloses a technique in which the radius of curvature inside the claw portion of the pipe holding member 2 is made larger than the radius of curvature of the outer diameter of the resin tube, and both end edges of the claw are retracted from the surface of the resin tube. ing. However, when the curvature radius inside the claw portion is increased as described above, a special punching tool corresponding to the shape is required, and the cost is increased.

JP 2004-308793 A JP 2005-133766 A

  The present invention has been made in view of the above problems, and it is possible to suppress the claw part from scratching the surface of the tubular body and to bite the tubular body over a certain amount, and to be easily manufactured. It is an object of the present invention to provide a lock ring for a joint, a pipe joint, and a method for manufacturing the lock ring for a pipe joint.

In order to solve the above problems, a lock ring for a pipe joint according to claim 1 is a lock ring for a pipe joint that constitutes a part of a pipe joint into which a pipe body is inserted and prevents the pipe body from coming out. A plurality of inner circumferential cutout portions arranged outside the tubular body and cut away from the inner circumferential side toward the radial outer side at regular intervals in the circumferential direction, and the inner circumferential cutout portion. An annular ring portion comprising a plurality of outer circumferential side cutout portions which are longer in the circumferential direction than the inner circumferential side cutout portion at different positions in the circumferential direction, and are cut out radially outward from the outer circumferential side ; A plurality of inner circumferential cutout portions extending from the radially inner side of the ring portion between adjacent inner circumferential cutout portions, and biting into the outer peripheral surface of the tubular body to prevent the tubular body from coming out. includes a pawl portion, as viewed in the axial direction of the ring portion, the distal end sides of the claws, next to the circumferential direction Wherein is a long straight shape than the circumferential length of the gap leading edge between the claw portion, the claw portion, when the tubular body is to get out, the central part periphery of the tubular body of the leading edge that fits It is designed to bite into the surface and to be in a state where both end portions of the tip side are separated from the outer peripheral surface of the tubular body.

  According to the lock ring for a pipe joint having the above-described configuration, since the tip side of the claw portion is linear when viewed from the axial direction of the ring portion, both ends of the tip side of the claw portion are radial from the outer surface of the tube body. Retreating outward. Therefore, it is possible to prevent the outer surface of the tube from being damaged by both ends of the claw when the tube is inserted.

  Further, by making the tip side of the claw part into a linear shape, the inside of the claw part can be easily punched and formed by the punching with a polygonal die punch.

  The lock ring for a pipe joint according to claim 2 is characterized in that the claw portions are formed at eight positions at equal intervals along the circumferential direction of the ring portion.

  In this way, the claw part is formed at eight positions at equal intervals along the circumferential direction of the ring part, so that the inside of the claw part can be easily punched and formed by punching with a die punch having an octagonal cross section. it can.

  The pipe joint according to claim 3 is a joint body in which an insertion hole into which a pipe body is inserted is formed, the lock ring for a pipe joint according to claim 1 or 2, and the joint. A tapered surface that is extrapolated to a main body, holds the pipe joint lock ring on the joint main body, and abuts against a ring portion of the pipe joint lock ring to prevent the claw portion from coming off from the pipe body. And a sleeve provided.

  According to the pipe joint having the above configuration, since the pipe joint lock ring according to claim 1 is used, the outer surface of the pipe body is inserted when the pipe body is inserted into the pipe joint. It is possible to prevent the pipe body from being damaged, and to prevent water leakage of the pipe body at the connection portion to the pipe joint.

  The method for manufacturing a lock ring for a pipe joint according to claim 4 is the method for manufacturing the lock ring for a pipe joint according to claim 1 or 2, wherein the ring is disposed outside the pipe body. The inside of the portion in the radial direction is punched with a punching tool having a polygonal cross section, and the tip side of the claw portion is formed into a linear shape.

  In this manner, the tip side of the claw portion can be easily formed into a linear shape using a punching tool having a polygonal cross section. Note that a die punch can be used as the punching tool.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that a nail | claw part of the lock ring for pipe joints damages a pipe body surface, and bites into a pipe body more than a fixed amount, and can manufacture easily.

It is a disassembled perspective view of the pipe joint which concerns on embodiment of this invention. It is a pipe joint which concerns on embodiment of this invention, Comprising: It is a half-cut sectional view which shows the state which isolate | separated the pipe body. (A) is a perspective view of a lock ring used in the pipe joint shown in FIG. 1, (B) is a plan view of the lock ring used in the pipe joint shown in FIG. 1, and (C) is a half cut sectional view of the lock ring. . It is AA sectional drawing of the lock ring which concerns on embodiment of this invention. It is the elements on larger scale which show the state where the lock ring which concerns on embodiment of this invention bites into the tubular body. It is explanatory drawing of the manufacturing process (A)-(C) of the lock ring which concerns on embodiment of this invention. It is a perspective view of the die punch used for manufacture of the lock ring which concerns on embodiment of this invention. It is a pipe joint which concerns on embodiment of this invention, Comprising: It is a half-cut sectional view which shows the state which inserted the pipe body to the middle. It is a pipe joint which concerns on embodiment of this invention, Comprising: It is a half-cut sectional view which shows the state which couple | bonded the pipe body. It is a pipe joint which concerns on embodiment of this invention, Comprising: It is a half-cut sectional view which shows the state which released | released the lock ring in order to detach | leave a pipe body.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an exploded perspective view of a pipe joint 10 including a lock ring 30 for a pipe joint according to an embodiment of the present invention. Further, FIG. 2 shows a half cut sectional view of the pipe joint 10 including the lock ring 30 for the pipe joint according to the embodiment of the present invention before the pipe body 40 is inserted.

  The pipe joint 10 includes a tubular main body 12 and a tubular sleeve 18 that is extrapolated to the main body 12. As shown in FIG. 2, an insertion hole 20 into which the tube body 40 is inserted is formed between the sleeve 18 and the main body portion 12.

  The main body 12 has a cylindrical shape, and a circumferential groove 12M is formed on the outer periphery on one end side. Moreover, the other end side of the main-body part 12 is convex in the side cross section of the front-end | tip 12T toward the front-end | tip. An intermediate portion 12H having a large outer diameter is formed in the intermediate portion of the main body portion 12. The intermediate portion 12H has a hexagonal shape when viewed from the axial direction S of the pipe joint 10. A circumferential groove 12 </ b> R into which an O-ring 24 to be described later is fitted is formed on the inner periphery of the main body 12 on the tip side of the intermediate portion 12 </ b> H. An engaging portion 12K is formed on the outer periphery between the tip 12T and the intermediate portion 12H, and is engaged with the inside of the sleeve 18.

  A lock ring 30 for holding the tube body 40 in the insertion hole 20 is disposed inside the sleeve 18. The lock ring 30 has a substantially V-shaped cross section, and is disposed such that the substantially V-shaped opening side faces the back side of the main body 12 (the side opposite to the insertion side of the tube body 40). The opening side of the lock ring 30 faces the tip 12T of the main body 12, and a part of the substantially V-shaped inner surface is in contact with the tip 12T. Details of the lock ring 30 will be described later.

  On the inner wall of the sleeve 18, a tapered surface 18 </ b> A is formed on which the substantially V-shaped outer surface of the lock ring 30 can abut. The tapered surface 18A is formed so as to reduce in diameter toward the inlet 20A side of the insertion hole 20.

  On the inner peripheral side of the sleeve 18, a release ring 22 that is movable along the axial direction of the pipe joint 10 is inserted closer to the inlet 20 </ b> A of the insertion hole 20 than the lock ring 30. The release ring 22 has a substantially cylindrical shape, and the inner wall forms a part of the insertion hole 20. A protrusion 22A is formed on the outer periphery of the release ring 22 in the circumferential direction, and coming out of the sleeve 18 is prevented by contacting the small diameter portion 18B formed on the inner periphery of the sleeve 18. The tip 22 </ b> B of the protrusion 22 </ b> A has a tapered shape and is disposed along the radially outer peripheral surface of the lock ring 30.

  A tapered wall surface 13 whose inner diameter is reduced toward the back side is formed in the innermost part of the insertion hole 20 on the back side (circumferential groove 12M side) of the main body part 12R. The tip of the tubular body 40 abuts on the wall surface 13, and the wall surface 13 serves as a stopper for the tubular body 40.

  In this pipe joint 10, the main body 12 can be made of bronze, the sleeve 18 and the release ring 22 can be made of resin, and the lock ring 30 can be made of stainless steel. Each member of the pipe joint 10 is not limited to these materials, and other materials may be used. The tube body 40 is made of resin. The tube body 40 may be made of resin or other relatively soft member into which the claw portion 36 of the lock ring 30 can bite.

  FIG. 3 shows a single lock ring 30 used in the pipe joint 10 shown in FIG. 3A is a perspective view of the lock ring 30, FIG. 3B is a plan view of the lock ring 30, and FIG. 3C is a half sectional view of the lock ring 30.

  The lock ring 30 includes an annular ring portion 31. The ring portion 31 includes a ring portion 31 that is notched in the radial direction from the inner peripheral side at a predetermined interval in the circumferential direction, and the ring portion 31 that is different from the notch portion 32 in the radial direction from the outer peripheral side. Notches 34 are formed (eight in each embodiment in this embodiment). The lock ring 30 has a substantially V-shaped cross section obtained by cutting a portion where the notches 32 and 34 are not formed along the axial direction.

  A convex portion 33 extending radially inward of the ring portion 31 is formed between adjacent cutout portions 32 of the ring portion 31, and a claw portion 36 is formed at the tip of the convex portion 33. As shown in FIG. 4, the claw portion 36 is bent and extended in a direction from the direction along the V shape of the ring portion 31 toward the outside of the V shape as seen from the circumferential direction. The tip of the claw portion 36 is sharp and has a shape that can easily bite into the tubular body 40.

  The tip side 36 </ b> A of the claw portion 36 has a linear shape when viewed from the axial direction S. Eight claw portions 36 are formed in the circumferential direction, and when each tip side 36A is extended to intersect with an extension line of adjacent tip side 36A, a substantially regular octagon is formed.

  When the tubular body 40 is inserted, the central portion of the distal end side 36 </ b> A of the claw portion 36 contacts (contacts) the outer peripheral surface of the tubular body 40, but both end portions of the distal end side 36 </ b> A are separated from the outer peripheral surface of the tubular body 40. Further, when the tubular body 40 is about to come out, as shown in FIG. 5, the central portion of the tip side 36 </ b> A of the claw portion 36 bites into the outer peripheral surface of the tubular body 40, but both end portions of the distal end side 36 </ b> A are It remains spaced from the outer peripheral surface.

  The lock ring 30 has a substantially V-shaped cross section, and a total of 16 cuts (notches 32 and 34) are provided on the inner peripheral side and the outer peripheral side of the ring portion 31. It can be elastically deformed so that the space is crushed (so that the portions extending on both sides of the V-shape approach each other). Therefore, as the tube body 40 is inserted into the insertion hole 20, the lock ring 30 is elastically deformed and expands in a concentric shape.

  Next, a method for manufacturing the lock ring 30 will be described.

  First, as shown in FIG. 6 (A), the plate-shaped ring member 35 having the notches 32 and 34 is molded in a V shape and a shape on the tip side where the claw portion 36 is formed. .

  Next, as shown in FIG. 6B, the inside of the ring member 35 is punched out using the die 50 and the punch 52 so that the claw portion 36 is formed. Here, as shown in FIG. 7, the die 50 has a holding portion 50 </ b> A that holds the ring member 35 and a regular octagonal recess 50 </ b> B into which the punch 52 is inserted. The punch 52 has a regular octagonal convex portion 52A corresponding to the concave portion 50B. The ring member 35 is set to the holding portion 50A so that the tip of the blade that becomes the claw portion 36 is cut off at 60 °. The punching is performed by holding the ring member 35 on the holding portion 50A and inserting the convex portion 52A of the punch 52 into the concave portion 50B of the die 50.

  Next, as shown in FIG. 6C, the tip angle of the blade of the claw portion 36 is adjusted, and the lock ring 30 is completed.

  In the lock ring 30 of the present embodiment, since the tip side 36A of the claw portion 36 is linear, as described above, the claw portion 36 can be easily formed by using a polygon (in the above, regular octagonal) die punch. A cutting edge can be formed.

  Next, the operation of the pipe joint 10 will be described.

  When the pipe body 40 is inserted into the insertion hole 20 of the pipe joint 10, the tip of the pipe body 40 expands the diameter of the lock ring 30 as shown in FIG. 8. The tubular body 40 is inserted into the back side while the outer peripheral surface of the tubular body 40 is in sliding contact with the claw portion 36 of the lock ring 30, and the inner peripheral surface of the tubular body 40 is in contact with the O-ring 24. When the tubular body 40 is further inserted, the distal end of the tubular body 40 reaches the wall surface 13 of the main body 12. At this time, the claw portion 36 of the lock ring 30 has a straight tip end 36A, so that the central portion of the tip side 36A is slidably in contact with the tube body 40, but both ends of the tip side 36A are tube ends. It is not slidably contacted with the body 40, or is slidably contacted with the tube body 40 as compared with the central portion.

  In the mounted state shown in FIG. 8, when an internal pressure acts on the tube body 40, the tube body 40 receives a force in a direction in which the tube body 40 comes out of the main body portion 12. As a result, the tube body 40 and the lock ring 30 are slightly moved in the direction of coming out of the insertion hole 20, and the claw portion 36 of the lock ring 30 bites into the outer peripheral side of the tube body 40 as shown in FIG. 9. At this time, since the claw portion 36 of the lock ring 30 is inclined toward the back side of the main body portion 12, it is easy to bite into the tube body 40, and the claw portion 36 has a direction opposite to the direction in which the tube body 40 is pulled out. The tube 40 is difficult to come off.

  On the other hand, when the tubular body 40 is detached from the mounted state shown in FIG. 9, a dedicated jig is inserted from the inlet 20A side of the insertion hole 20 and the release ring 22 is pushed into the back side. As a result, as shown in FIG. 10, the distal end portion 22 </ b> B of the release ring 22 pushes the claw portion 36 of the lock ring 30 to expand the diameter of the lock ring 30. At that time, the distal end portion 22B of the release ring 22 pushes the claw portion 36 of the lock ring 30 and simultaneously enters between the claw portion 36 and the tube body 40, and the claw portion 36 is extracted from the tube body 40. In this state, the tube body 40 can be pulled out (detached) from the insertion hole 20.

  In the pipe joint 10 of the present embodiment, the tip side 36A of the claw portion 36 of the lock ring 30 is linear, and therefore, when the pipe body 40 is inserted into the pipe joint 10, the pipes formed by both ends of the tip side 36A. Damage to the outer peripheral surface of the body 40 can be suppressed.

  In the above embodiment, the number of the claw portions 36 of the lock ring 30 is eight. However, the number of claw portions 36 is not limited to this configuration, and may be another number (for example, 6 to 18).

  Moreover, in this embodiment, although the example of the pipe joint which performs the seal | sticker between the pipe body 40 and the pipe joint 10 on the outer surface side of the pipe body 40 was demonstrated, the seal | sticker between a pipe body and a pipe joint is carried out. The above-described lock ring 30 may be used for a pipe joint of the type performed on the inner surface side of the pipe body.

DESCRIPTION OF SYMBOLS 10 Pipe joint 30 Lock ring 31 Ring part 33 Convex part 36 Claw part 36A Tip side 40 Tube 50 Die 52 Punch

Claims (4)

A part of a pipe joint into which a pipe body is inserted, a lock ring for a pipe joint that prevents the pipe body from being pulled out,
A plurality of inner peripheral cutout portions arranged on the outer side of the tubular body and notched from the inner peripheral side toward the radial outer side at regular intervals in the circumferential direction, and the inner peripheral cutout portion in the circumferential direction. An annular ring portion comprising a plurality of outer circumferential side cutout portions which are longer in the circumferential direction than the inner circumferential side cutout portion at different positions and cut out from the outer circumferential side toward the radial inner side ;
A plurality of inner circumferential cutouts extending from the radially inner side of the ring portion between the plurality of inner circumferential cutouts, and biting into the outer circumferential surface of the tubular body to prevent the tubular body from slipping out. The nails of
With
When viewed from the axial direction of the ring part, the front end side of the claw part has a linear shape longer than the circumferential length of the gap between the front end sides of the claw parts adjacent in the circumferential direction ,
When the tube is about to slip out of the claw, the central portion of the tip side bites into the outer peripheral surface of the tube, and both end portions of the tip side are separated from the outer peripheral surface of the tube A lock ring for a pipe joint, characterized by being designed to be   The said claw part is formed in eight places at equal intervals along the circumferential direction of the said ring part, The lock ring for pipe joints of Claim 1 characterized by the above-mentioned. A joint body in which an insertion hole into which the tubular body is inserted is formed;
A lock ring for a pipe joint according to any one of claims 1 and 2,
A taper that is extrapolated to the joint body, holds the pipe joint lock ring on the joint body, and abuts against a ring portion of the pipe joint lock ring to prevent the claw portion from coming off from the pipe body. A sleeve with a surface,
Pipe fittings with A method of manufacturing a lock ring for a pipe joint according to claim 1 or 2,
A pipe joint, characterized in that a radially inner side of an annular ring portion disposed outside the tubular body is punched with a punching tool having a polygonal cross section, and a tip side of the claw portion is formed into a linear shape. Method of manufacturing a lock ring.

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