JP2920146B1 - Lock ring and manufacturing method thereof - Google Patents

Abstract

Kind Code: A1 A lock ring capable of preventing a resin pipe inserted into a joint from being cracked or cut and securing a required amount of a restricting piece into the pipe and manufacturing the lock ring. Provide a way. SOLUTION: A lock ring 34 includes a base ring 35 formed in an annular shape, and a plurality of regulating pieces 36 projecting inward from the base ring 35 by the same length. The notch 39 is formed at the center between all the regulating pieces 36 adjacent to each other. The V-shaped slit 40 is formed at a predetermined depth from the center of the bottom of the notch 39 to the base ring 35. The edge of the regulating piece 36 is chamfered by a barrel forming method into an arc having a radius of 0.02 to 0.2 mm, and burrs generated during press molding are removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock ring for preventing an end of a resin pipe used for water pipe, hot water pipe, floor heating, road heating, etc. from coming out of a joint, and a method of manufacturing the same. It is about.

[0002]

2. Description of the Related Art A conventional lock ring is disclosed in
A pipe joint disclosed in Japanese Patent No. 685105 is known. The pipe joint is formed into a cylindrical shape, a socket that allows insertion of a pipe, a lock ring, a backup ring, and a seal ring that are disposed in an enlarged inner diameter portion provided therein, and are screwed to the outer periphery of the socket,
It is composed of a cap for preventing each ring from coming out of the pipe joint.

The lock ring is formed by press-forming a ring-shaped base ring and a plurality of regulating pieces projecting from the base ring at predetermined intervals in the circumferential direction. In addition, a claw of a predetermined length is formed inward at a tip end of each regulating piece, and a projection is formed on both sides of the regulating piece so as to project in the width direction of the regulating piece.

When a pipe is inserted into a joint,
The required amount of the locking ring claw bites into the pipe to prevent the pipe from slipping out of the pipe joint, and prevents the claw from penetrating the pipe wall further by the protruding portion. To prevent it.

[0005]

However, since the lock ring is formed by press molding, the edges of the claw and the projection of the restricting piece are sharp and burrs remain.
Therefore, when an external force in the pull-out direction acts on the pipe inserted into the joint, there is a problem that a sharp edge or a burr of the regulating piece causes a tear to be formed in a portion of the pipe into which the regulating piece bites. there were. In addition, when the external force in the direction of pulling out the pipe increases, there is a problem that the tear is further increased, the pipe is cut, and the transport fluid leaks from that portion.

The present invention has been made by paying attention to such problems existing in the prior art. The purpose of the lock ring is to prevent a resin pipe inserted into the joint from being cracked or cut, and to secure a required amount of the restricting piece into the pipe. It is to provide a manufacturing method.

[0007]

In order to achieve the above object, a lock ring according to claim 1 is engaged with an annular receiving surface provided in a cylindrical joint body. The male body of the cylindrical pressing body is positioned and fixed by the pressing body in the joint formed by screwing the male screw part of the cylindrical pressing body into the female screw part formed in the joint body, and a resin pipe is provided in the joint body via the pressing body. A lock ring that prevents the end of the pipe from coming off the joint when it is inserted until it comes into contact with the abutment surface, and is substantially the same as the base ring engaged with the receiving surface and inward from the base ring. A plurality of regulating pieces protruding in length, wherein at least an inner edge of the regulating piece that bites into the pipe and a portion of the regulating piece that restricts biting into the pipe are chamfered.

According to a second aspect of the present invention, in the lock ring according to the first aspect, the chamfer has a radius of 0.02.
It is applied so as to form an arc within the range of 0.2 mm.

According to a third aspect of the present invention, there is provided a lock ring manufacturing method, wherein at least an inner edge of the restriction piece of the lock ring which bites into the pipe and a portion of the lock ring which restricts the bite of the restriction piece into the pipe are processed by barrel processing. It is chamfered by a method, shot peening or sandblasting.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail. (First Embodiment) As shown in FIG. 1 and FIG.
1 is formed in a cylindrical shape from crosslinked polyethylene or polybutene, and is used for water supply piping and the like. Joint body 12
Is formed in a cylindrical shape from brass or bronze, a first male screw portion 13 is formed at one end outer periphery, and a pipe 1 such as a water supply pipe is formed.
0 can be screwed. The nut part 14 is the joint body 1
2 is formed on the outer periphery of the other end. And the joint body 12
When the thread 10 and the pipe 10 such as a water supply pipe are screwed and released, the joint body 12 can be easily rotated by engaging a wrench or the like with the nut portion 14.

The first female screw portion 15 is formed on the inner circumference at the other end of the joint body 12. The contact surface 16 is provided on the joint body 12.
An annular portion is provided in the inner back portion so as to be orthogonal to the axis of the joint body 12. The inclined surface 17 is formed in a ring shape in the joint body 12 so that the inner diameter increases from the outer edge of the inner peripheral surface connected to the contact surface 16 toward the first female screw portion 15. The receiving surface 18 is provided on the outer peripheral edge of the inclined surface 17 so as to be orthogonal to the axis of the joint body 12.
2 is formed in an annular shape.

The introduction passage 45 is formed from one end in the joint main body 12 to the contact surface 16. When the joint main body 12 is screwed into the pipe 10 such as a water supply pipe, the liquid passes through the introduction passage 45 and passes through the pipe 11. It is distributed inside. Inclined wall 4
Reference numeral 6 denotes an inner peripheral surface of the introduction path 45 on the nut part 14
It is formed so that its inner diameter is reduced toward the female screw portion 15 side. The inner diameter of the reduced diameter portion 47 is smaller than the inner diameter of the introduction passage 45 from the inner peripheral edge of the inclined wall 46 on the first female screw portion 15 side.

The pressing body 19 includes a cylindrical portion 20 made of brass or bronze, and a grip portion 21 formed smaller than the outer shape of the nut portion 14 of the joint body 12. The second male screw part 22 is formed on the outer peripheral surface of the cylindrical part 20 and can be screwed to the first female screw part 15 of the joint body 12. The pair of locking portions 23 are
Are cut out at opposing positions on the outer periphery of the end.
When the pressing body 19 is screwed into the joint body 12 and released, the pressing body 19 can be easily rotated by engaging a wrench or the like with the locking portion 23. .

The outer peripheral groove 24 is formed in the center of the outer peripheral surface of the pressing body 19, and a first seal ring 25 formed in a ring shape by rubber is fitted in the outer peripheral groove 24 as a seal member. Then, when the pressing body 19 is screwed into the joint body 12, the first seal ring 25 is connected to the pressing body 19 and the joint body 1.
2 is sealed. The first inner circumferential groove 26 is formed slightly closer to the grip 21 than the inner circumferential center of the pressing body 19, and a second seal ring 27 having a circular cross section as a seal member is fitted therein.

The second inner peripheral groove 28 is formed in the first inner peripheral groove 2.
6, the length of the second inner peripheral groove 28 in the axial direction of the joint body 12 is the same as the first inner peripheral groove 26, and the second inner peripheral groove 28 is deeper than the first inner peripheral groove 26. Have been.

A third seal ring 29 as a seal member having the same size as the second seal ring 27 and having a circular cross section is fitted in the second inner peripheral groove 28. Therefore, when the pipe 11 is not inserted into the pressing body 19, the second seal ring 27 protrudes inward of the pressing body 19 from the third seal ring 29. Further, when the end of the pipe 11 is inserted into the pressing body 19, the resistance applied to the third seal ring 29 is reduced more than that of the second seal ring 27.

As a result, when the pipe 11 is inserted into the joint body 12 through the pressing body 19, the gap between the pipe 11 and the pressing body 19 is sealed by the second seal ring 27 and the third seal ring 29. It has become.

As shown in FIG. 3, the core ring 30 includes a cylindrical portion 31 made of brass or bronze, and a flange portion 32 formed at one end thereof. The annular portion 42 is formed in an annular shape from the inner end surface 32a of the flange portion 32 to the outer end surface 32b. The inclined surface 43 is formed such that the diameter decreases from the outer edge of the annular portion 42 toward the inside. At this time, the core ring 30 extends from the outer edge of the annular portion 42.
Is assumed to be 30 degrees between the straight line L and the outer periphery of the inclined surface 43. Further, the annular portion 4 in the axial direction of the core ring 30.
The ratio of the length of 2 to the length of the inclined surface 43 is set to 1: 2.

The tubular portion 31 is fitted into the pipe 11 to prevent the pipe 11 from being deformed inward due to thermal expansion or the like. The inclined portion 33 is formed so as to have a slightly reduced diameter from the base end side of the cylindrical portion 31 toward the distal end.

Then, as shown in FIG. 5, the tubular portion 31 is fitted inside the pipe 11. At this time, the inclined portion 33 can cope with a variation in the inner diameter of the pipe 11 and facilitates insertion of the tubular portion 31 into the pipe 11. The inner end surface 32 a of the flange 32 engages with the end surface 11 a of the pipe 11.

Further, as shown in FIG. 6, when the pipe 11 is inserted into the joint body 12 in this state, the inclined surface 43
Thereby, the flange portion 32 can be smoothly inserted without being caught by the second seal ring 27 and the third seal ring 29. At this time, since the second seal ring 27 protrudes inward of the pressing body 19 from the third seal ring 29, the pipe 1 of the second seal ring 27
1 is stronger than the third seal ring 29.

Therefore, due to the momentum when the pipe 11 passes through the second seal ring 27, the pipe 11 can easily pass through the third seal ring 29.
Outer end surface 3 of flange 32 of core ring 30 fitted in 1
2b can be easily brought into contact with the contact surface 16 in the joint body 12. In addition, since the outer end surface 32b is formed in a flat shape, the outer end surface 32b comes into close contact with the contact surface 16 and can exhibit a sealing function.

At this time, as shown in FIG. 1, the inner diameter of the core ring 30 and the inner diameter of the reduced diameter portion 47 formed in the introduction path 45 are configured to be the same. for that reason,
For example, when the flow rate in the pipe 10 changes suddenly due to sudden opening / closing of a valve, mixing of gas, and the like, and a water hammer phenomenon in which an abnormal pressure occurs in the pipe 10 occurs, the coring 30 of the coring 30 is formed by the inclined wall 46. An abnormal pressure can be prevented from being applied to the outer end surface 32b of the flange portion 32. Further, the reduced diameter portion 47 allows the abnormal pressure to be released from the inner peripheral surface of the coring 30 toward the pipe 11. Therefore, it is possible to prevent the pipe 11 from falling out of the joint body 12 due to a water hammer phenomenon or the like.

Also, as shown in FIG.
When the end of the pipe 11 into which the is inserted is inserted into the joint body 12 through the inside of the pressing body 19, and the outer end surface 32 b of the flange 32 is brought into contact with the contact surface 16 in the joint body 12, the pressing is performed. Body 1
9 and the end surface of the cylindrical portion 31 of the core ring 30 are located at the same position. Therefore, the coring 30
By observing the positional relationship between the end surface of the flange body 32 and the end surface of the pressing body 19 from the outside of the translucent pipe 11, it is determined whether or not the outer end surface 32b of the flange portion 32 is in contact with the contact surface 16 in the joint body 12. You can check it.

The lock ring 34 is formed by putting a molded product of stainless steel into a predetermined shape by a press molding method together with an abrasive and abrasive grains having a diameter of 20 mm or less into a container, and adding water as necessary. A barrel processing method in which the container is vibrated or rotated within 50 hours, a shot peening method in which a metal ball hits the lock ring at high speed, or a sand blast method in which an abrasive such as glass beads is sprayed on the lock ring. Obtained by polishing the surface.

Since the sandblasting method sprays a fine abrasive such as a glass bead, the chamfering ability is low, which is not preferable. In the shot peening method, a metal ball is hit against the lock ring 34 at a high speed.
Is not preferred because it cures. Therefore, a barrel processing method that can reliably perform chamfering is preferable. Among the barrel processing methods, a wet high-speed rotary barrel processing method in which the container is rotated at a high speed while adding water to chamfer the lock ring 34 is preferable.

When a wet high-speed barrel processing method is adopted, the container is rotated within 3 hours within a rotation speed range of 200 to 2000 rpm with water being added using abrasive grains having a diameter of 5 mm or less. It is preferred that

As a result, the entire surface and the edge of the lock ring 34 can be chamfered, and burrs generated during press molding can be removed. If the rotation or vibration time exceeds 5 hours, the entire surface and the edge of the lock ring 34 are excessively chamfered, and the restriction piece 36 of the lock ring 34 that has cut into the pipe 11 is undesirably removed.

The obtained lock ring 34 has a thickness of 0.2 to 0.6 mm in order to maintain a predetermined strength.
Is preferably formed in the range of 0.3 to 0.5 m
More preferably, it is formed in the range of m. As shown in FIGS. 4A and 4B, the lock ring 34 includes a ring-shaped base ring 35 and a plurality of restriction pieces 36 projecting inward from the base ring 35 by the same length. It is composed of Each regulating piece 36 has an arcuate shape at the distal end, and a biting portion 36a that cuts into the pipe 11 is formed, and a corner portion 36b that restricts the restricting piece 36 from biting into the pipe 11 more than a required amount is formed at the base end. Have been. The restricting piece 36 is bent from the inner peripheral edge of the base ring 35 so as to extend at 45 degrees with respect to the base ring 35. Then, the pipe 11 is easily inserted from the proximal end side to the distal end side of the restricting piece 36, and the inserted pipe 11 is restricted from coming off.

The notch 39 is formed in all the adjacent regulating pieces 36.
An arc-shaped notch is formed in the center between the restricting pieces 36 and the base ring 35 so as to correspond to the depth at which the restricting pieces 36 bite into the pipe 11. Notch 39
Is set such that the pipe 11 can be prevented from coming off when the portion from the tip of the regulating piece 36 to the bottom of the cutout portion 39 bites into the pipe 11.

The V-shaped slit 40 has a predetermined depth from the center of the bottom of the notch 39 to the base ring 35, that is, a depth that allows deformation of the restricting piece 36 when the pipe 11 is inserted into the lock ring 34. It is formed only.

As shown in FIGS. 4C and 4D, the edges of the biting portions 36a and the corners 36b of the respective restriction pieces 36 of the lock ring 34 are chamfered by a barrel processing method. At this time, the edges of the bite portion 36a and the corner portion 36b prevent the cut portion from being formed in the portion of the pipe 11 bitten by the bite portion 36a, and the corner portion 36b that prevents bite more than a required amount is formed. In order to prevent biting, it is preferable to chamfer an arc having a radius of 0.02 to 0.2 mm, and it is particularly preferable to chamfer an arc having a radius of 0.02 to 0.1 mm. When chamfering is performed in an arc shape having a radius exceeding 0.2 mm, the bite portion 36a
Undesirably escapes from the pipe 11.

Therefore, the pipe 11 is attached to the lock ring 34.
When the end of the rod is inserted, the restriction piece 3 bites into the pipe 11.
The inner edge of the bite portion 36a and the corner portion 36b thereof can prevent the pipe 11 from being torn or cut, and also prevent the pipe 11 from coming off the lock ring 34. Has become.

As shown in FIG. 1, the base ring 35 is engaged on the receiving surface 18 of the joint body 12, and the regulating piece 36 is positioned so as to have a gap between the restricting piece 36 and the inclined surface 17. When the pressing body 19 is screwed into the joint body 12, the distal end of the cylindrical portion 20 of the pressing body 19 positions and fixes the base ring 35. Therefore, it is possible to prevent the lock ring 34 from moving in the axial direction and the circumferential direction.

Further, the end of the pipe 11 is
4, the restricting piece 36 spreads slightly outward and bites into the outer periphery of the pipe 11 by a required amount from the biting portion 36a to the corner portion 36b. At this time, since the slits 40 are formed between all the adjacent restriction pieces 36, the outward expansion of the restriction pieces 36 is facilitated.
As a result, the pipe 11 is prevented from falling off by the joint body 12.

Moreover, since the biting portion 36a of the regulating piece 36 is formed in an arc shape, the pipe 11 of the regulating piece 36
Not only can reduce the digging area,
The shear force can be reduced. A notch 39 is formed between all adjacent restriction pieces 36,
A corner 36b is formed. Therefore, it is possible to prevent the restriction piece 36 from penetrating into the pipe 11 to the root thereof,
It is possible to prevent the tear formed by the bite from being connected.

The joint 37 is constituted by the joint body 12, the lock ring 34, the core ring 30, the pressing body 19 and the like. Next, a method of connecting the pipe 11 to the joint 37 will be described.

First, the first male screw portion 13 of the joint body 12 is screwed into the pipe 10 such as a water supply pipe, and the nut section 14 is screwed by a spanner or the like, and the joint body 12 is fastened and fixed to the pipe 10. Next, the lock ring 34 is inserted into the joint body 12.
And the base ring 35 is engaged with the receiving surface 18 in the joint body 12, and the regulating piece 36 is attached to the inclined surface 1.
7 is provided.

Then, the second male screw portion 22 of the pressing body 19
Is screwed into the first female screw portion 15 of the joint body 12, and a wrench or the like is engaged with the engaging portion 23 to push the pressing body 19 to the joint body 12.
To screw. At this time, the lock ring 34 is
Is fixed so as to be immovable in the axial direction and the circumferential direction by the distal end portion of the cylindrical portion 20.
5, the gap between the joint body 12 and the pressing body 19 is sealed.

Subsequently, as shown in FIG.
0, the cylindrical portion 31 is fitted into the pipe 11 from the inclined portion 33, and the inner end surface 32a of the flange portion 32 is connected to the end surface 11a of the pipe 11.
Push until it engages. At this time, the inclined surface 43 allows the flange portion 32 to be smoothly inserted without being caught by the second seal ring 27 and the third seal ring 29.

Since the second seal ring 27 projects from the third seal ring 29 to the inside of the pressing body 19,
The pressing force of the second seal ring 27 on the pipe 11 is:
It is stronger than the third seal ring 29. for that reason,
Due to the momentum when the pipe 11 passes through the second seal ring 27, the pipe 11 can easily pass through the third seal ring 29.

Then, as shown in FIG.
The end of the pipe 11 on the side where 0 is fitted is inserted into the joint body 12 via the pressing body 19. At this time, the positional relationship between the end surface of the cylindrical portion 31 of the core ring 30 and the end surface of the pressing body 19 is visually observed, and the pipe 11 is pushed in until they are at the same position, and the outer end surface 32 b of the flange portion 32 is Is brought into contact with the contact surface 16.

As a result, as shown in FIG. 1, the second seal ring 27 and the third seal ring 29
The gap between 1 and the pressing body 19 is sealed, and the end of the pipe 11 is airtightly connected to the joint 37. Further, the pipe 11 is prevented from falling out of the joint 37 by the lock ring 34.

As described above, according to the first embodiment, the following effects are exhibited. According to the first embodiment, each of the restricting pieces 36 and the base ring 35 of the lock ring 34 is chamfered at its edge by a barrel processing method, and burrs are removed. Therefore, when the end of the pipe 11 is inserted into the lock ring 34, the inner edge of the biting portion 36 a of the restriction piece 36 biting into the pipe 11 and the corner 36 b cause the pipe 1
1 can be prevented from being cracked or cut.

According to the first embodiment, the inner edge of the biting portion 36a and the chamfer of the corner portion 36b of each restriction piece 36 biting into the pipe 11 have a radius of an arc of 0.02 to 0.2.
mm. for that reason,
A required amount of biting of the inner edge of the regulating piece 36 into the pipe 11 can be secured, and the pipe 11 can be prevented from falling out of the joint body 12.

According to the first embodiment, the lock ring 34 is put into the container together with the abrasive and the abrasive having a diameter of 5 mm or less, and the container is kept at 200 to 2000 rpm while adding water.
・ Ensure that the edge of the biting portion 36a and the edge of the corner 36b of each of the restriction pieces 36 of the lock ring 34 is reliably chamfered by a wet high-speed rotary barrel processing method in which rotation is performed within 3 hours within the range of the rotation speed of p · m And burrs can be reliably removed.

(Second Embodiment) In the second embodiment, differences from the first embodiment will be mainly described. FIG.
As shown in FIG. 8, a base ring 35 of a pair of lock rings 34a, 34b is engaged on a receiving surface 18 in the joint main body 12 with a spacer 48 interposed therebetween.

As shown in FIGS. 9 (a) to 9 (d), a biting portion 36a which cuts into the pipe 11 is formed at the tip end of each of the restricting pieces 36 of the pair of lock rings 34a, 34b. The edges are chamfered and deburred by a barrel processing method. The notch 39 is formed at the center between all adjacent restriction pieces 36 so as to reach the base ring 35 from the restriction piece 36 side. FIG.
As shown in (c), the bite limiting portion 36b is formed in a tapered portion on both side edges of the bite portion 36a.
When 6a cuts into the pipe 11, the restriction piece 36 is restricted so as not to cut into the pipe 11 any more.

The edges of the restriction pieces 36 of the lock ring 34 and the edges of the base ring 35 are chamfered by a barrel processing method. At this time, the edges of the biting portion 36a and the biting limiting portion 36b of the restricting piece 36 have a radius of 0.02 to 0.2 mm in order to prevent the restricting piece 36 from biting into the pipe 11 more than a required amount. It is preferably chamfered in an arc shape, and particularly preferably in an arc shape of 0.02 to 0.1 mm. In addition, the entire surface and the edge of the lock ring 34 are polished by a barrel processing method, and burrs generated during press molding are removed.

Therefore, the pipe 11 is attached to the lock ring 34.
When the end of the rod is inserted, the restriction piece 3 bites into the pipe 11.
Inner edge of bite portion 36a and bite limit portion 36
With b, it is possible to prevent the pipe 11 from being torn or cut.

As shown in FIG. 8, the spacer 48 is interposed between the pair of lock rings 34a and 34b. The spacer 48 is preferably formed of stainless steel, brass or resin, and particularly preferably formed of stainless steel or brass, in order to improve the strength such as impact resistance. The spacer 48 has a thickness of 0.1 mm.
The width of the ring portion 48a corresponds to the width of the base ring 35 of the pair of lock rings 34a and 34b.

As shown in FIGS. 7 and 8, one of the lock rings 34a, 34b has one lock ring 3a.
4 a, the base ring 35 is engaged with the receiving surface 18 of the joint body 12, and the restricting piece 36 is positioned so as to have a gap with the inclined surface 17. The spacer 48 is engaged on the receiving surface 18 via the base ring 35 of one of the lock rings 34a. Then, the other lock ring 34
b means that the base ring 35 has one lock ring 34
a on the receiving surface 18 via the base ring 35 and the spacer 48.

At this time, the regulating piece 36 of the other lock ring 34b has a gap with the regulating piece 36 of the one lock ring 34a due to the thickness of the spacer 48.
Located inside them. Therefore, the regulating piece 36 is formed in two steps by the pair of lock rings 34a and 34b.

When the pressing body 19 is screwed into the joint main body 12, a pair of locking members are held in a state where the distal end of the cylindrical portion 20 of the pressing body 19 has a spacer 48 interposed between the pair of base rings 35. The rings 34 a and 34 b are positioned and fixed on the receiving surface 18. Therefore, the pair of lock rings 34a and 34b can be prevented from moving in the axial direction and the circumferential direction. The end of the pipe 11 is connected to a pair of lock rings 34a, 3a.
When inserted into 4b, the regulating pieces 36 located at the two stages spread slightly outward, respectively, and the tips thereof are engaged with the outer periphery of the pipe 11 in two stages. As a result, the pipe 11 is prevented from falling off by the joint body 12.

When the end of the pipe 11 is inserted,
A spacer 4 is provided between the pair of lock rings 34a and 34b.
Since the interposition 8 is interposed, the restriction pieces 36 located in two stages are prevented from overlapping, and the insertion of the end of the pipe 11 can be facilitated.

The joint body 12, the pair of lock rings 34a and 34b, the spacer 48, and the core ring 3
A joint 37 is constituted by the pressing body 19 and the pressing member 19. As described above, according to the second embodiment, the following effects are exhibited.

According to the second embodiment, a pair of lock rings 34a, 34 is provided on the receiving surface 18 in the joint body 12.
The base ring 35 of FIG. 2B is engaged, and a restriction piece 36 formed in two steps by a pair of lock rings 34a and 34b is engaged with the outer periphery of the pipe 11. Both of the pair of lock rings 34a and 34b are chamfered by a barrel processing method. Therefore, a pair of lock rings 3
The pipe 11 can be reliably prevented from falling out of the joint 37 while preventing the pipe 11 from being cracked or cut by the biting portion 36a and the biting limiting portion 36b of the restriction pieces 36 of 4a and 34b.

According to the second embodiment, the regulating piece 36 formed in two stages by the pair of lock rings 34a and 34b is engaged with the outer periphery of the pipe 11. Therefore, compared to the case where the number of the lock rings 34 is one, the force on the restricting pieces 36 in the direction in which the pipe 11 comes off is reduced. As a result, it is possible to prevent the restriction piece 36 of the lock ring 34 from being bent due to metal fatigue or the like, and to prolong the life of the lock ring 34.

The above embodiment can be modified and embodied as follows. In each embodiment, the lock ring 34 is chamfered by a dry rotary barrel processing method. Alternatively, the lock ring 34 is chamfered by a wet or dry vibration barrel processing method. Also in this case, the edge of the lock ring 34 can be chamfered and deburred.

In each embodiment, the lock ring 3
The chamfering of No. 4 is performed by a shot peening method in which a metal ball is hit against the lock ring 34 or a sand blast method in which an abrasive such as glass beads is sprayed on the lock ring 34. Also in this case, the edge of the lock ring 34 can be chamfered and deburred.

The lock ring 34 used in the first embodiment is any one of 2 to 5 and is engaged with the receiving surface 18. Or the lock ring 3 engaged on the receiving surface 18
4 is set to any one of 2 to 5,
Arbitrarily or alternately interposing spacers 48 between them. With such a configuration, the amount of the restriction piece 36 of the lock ring 34 engaged with the pipe 11 increases, and the pipe 11 can be more reliably prevented from falling out of the joint 37.

The number of lock rings 34 used in the second embodiment is either one or three to five and is engaged with the receiving surface 18. Alternatively, the number of the lock rings 34 to be engaged on the receiving surface 18 is any one of 3 to 5, and spacers 48 are interposed between the lock rings 34 arbitrarily or alternately. With such a configuration, the amount of the restriction piece 36 of the lock ring 34 engaged with the pipe 11 increases, and the pipe 11 can be more reliably prevented from falling out of the joint 37.

In the lock ring 34 of the first embodiment, an arc-shaped notch 39 is formed at least in the center between a pair of adjacent restriction pieces 36 from the restriction piece 36 side to the base ring 35, Adjacent regulating piece 36
A concave portion deeper than the notch portion 39 is formed on both sides of the concave portion. Further, from the center of the bottom of the notch 39, the base ring 35
To a predetermined depth, that is, the pipe 11
4, the restricting piece 36 is formed to a depth that allows deformation of the restricting piece 36. In the case of such a configuration, the regulating piece 3
6 can be cut into the pipe 11 by a required amount, and the pipe 11 can be prevented from falling out of the joint 37.

In the first embodiment, the V-shaped slit 40 is changed to a linear slit 40. Also in the case of such a configuration, the pipe 11
Is inserted into the lock ring 34,
Of the pipe 11 can be easily inserted into the lock ring 34 by allowing the outside to spread.

In each embodiment, the base ring 3
A recess is formed by notching so as to be located at the center of each of the restriction pieces 36 from the outer peripheral edge of each of the control pieces 5 to each of the restriction pieces 36. In such a configuration, the pipe 11 is connected to the lock ring 34.
When inserted into the lock ring 34, the restricting piece 36 easily spreads in the axial direction, so that the pipe 11 can be easily inserted into the lock ring 34 and the material can be saved.

In each embodiment, the lock ring 3
A plurality of restricting pieces 36 are formed so as to project inward from the inner peripheral edge of the base ring 35 of No. 4 and are not bent. With this configuration, when the pipe 11 is inserted into the lock ring 34, the restricting piece 36 bends in the axial direction, returns to its original position by elastic force, and causes the tip end portion to bite into the outer periphery of the pipe 11. It can be controlled to keep it from falling off.

In each embodiment, the lock ring 3
4. Change the material of 4 to aluminum, iron, etc. Even with such a configuration, the function of the lock ring 34 can be reliably exhibited.

In each embodiment, when the pipe 11 is inserted into the joint body 12 through the pressing body 19, the outer peripheral surface of the pipe 11 with which the biting portion 36 a of the restriction piece 36 of the lock ring 34 engages, Forming an annular groove in advance. In the case of such a configuration, the pipe 11 is
When inserted into the joint body 12 through the inside, the biting portion 36a of the restriction piece 36 of the lock ring 34 engages with the groove of the pipe 11, so that the pipe 11 can be reliably prevented from coming off.

Further, the technical idea grasped from the above embodiment will be described below. 3. The lock according to claim 1, wherein at least an inner edge of each of the restriction pieces of the lock ring that bites into the pipe and a portion of the restriction piece that restricts biting into the pipe are chamfered into an arc shape having substantially the same radius. ring. With this configuration, it is possible to reliably prevent the pipe from being cut from at least the inner edge of each restriction piece that bites into the pipe and the portion of the restriction piece that restricts biting into the pipe.

The lock ring according to claim 1 or 2, wherein a tip portion of the restriction piece is formed in an arc shape or a square shape. When the tip of the regulating piece has an arc shape, it is possible to prevent the regulating piece from biting into the pipe more than a required amount, and it is possible to prevent the pipe from being cut. If it is formed in a square shape, the restriction piece can be reliably cut into the pipe,
The pipe can be prevented from falling out of the joint.

An annular receiving surface provided in a cylindrical joint body is provided, and a lock ring having a plurality of chamfered restricting pieces which are annular and protrude inward is engaged with the receiving surface. The male thread of the cylindrical pressing body for positioning and fixing the lock ring is screwed into the female thread formed in the joint body, and a resin pipe is provided in the joint body via the pressing body. A joint configured to be inserted until it comes into contact with a surface to engage an end of the pipe with a restricting piece of the lock ring to restrict the pipe from coming off. With this configuration, it is possible to prevent the resin pipe from being cut by the restricting piece with the chamfered lock ring, and to surely prevent the pipe from falling out of the joint.

[0072]

The present invention is configured as described above, and has the following effects. According to the lock ring according to the first aspect of the present invention, it is possible to prevent the resin pipe inserted into the joint from being cracked or cut, and to secure the required amount of the restricting piece into the pipe. be able to.

According to the lock ring of the invention described in claim 2, the effects of the invention described in claim 1 can be more reliably exerted. According to the method for manufacturing a lock ring according to the third aspect of the present invention, a lock ring in which at least an inner edge of the restriction piece that bites into the pipe and a portion that restricts the restriction piece from biting into the pipe is chamfered is easily and reliably manufactured. can do.

[Brief description of the drawings]

FIG. 1 is an essential part cross-sectional view showing the inside of a joint according to a first embodiment.

FIG. 2 is an exploded perspective view showing the joint of the first embodiment.

FIG. 3 is a sectional view showing a coring of the embodiment.

4A is a plan view illustrating a lock ring according to the first embodiment, FIG. 4B is a cross-sectional view illustrating the lock ring according to the first embodiment, and FIG. 4C is a line 4-4 in FIG. Sectional drawing, (d) is the elements on larger scale which show the state which inserted the pipe in the lock ring of 1st Embodiment.

FIG. 5 is a side view showing a state where a coring is fitted into an end of the pipe.

FIG. 6 is an exploded side view showing a state in which a pipe is inserted into the joint body.

FIG. 7 is an essential part cross-sectional view showing the inside of the joint according to the second embodiment;

FIG. 8 is an exploded perspective view showing the joint of the second embodiment.

9A is a plan view illustrating a lock ring according to a second embodiment, FIG. 9B is a cross-sectional view illustrating the lock ring according to the second embodiment, and FIG. 9C is a portion illustrating a restriction piece according to the second embodiment. Enlarged view,
(D) is a sectional view taken along line 9-9 in FIG. 9 (b).

[Explanation of symbols]

11 pipe, 12 joint body, 15 first internal thread,
Reference numeral 16: contact surface, 18: receiving surface, 19: pressing body, 22: second male screw portion, 34: lock ring, 35: base ring, 36: regulating piece, 36a: biting portion, 36b: corner portion (biting restriction) Part), 37 ... joint.

Claims (3)

(57) [Claims] 1. A structure in which a male screw portion of a cylindrical pressing body is screwed with a female screw portion formed in a joint body while being engaged with an annular receiving surface provided in the cylindrical joint body. When a resin pipe is inserted into the joint to be pressed until it comes into contact with the contact surface provided in the joint body via the press body, the end of the pipe comes off from the joint. A lock ring for preventing the lock ring, comprising: a base ring engaged with the receiving surface; and a plurality of restricting pieces projecting inward from the base ring by substantially the same length, and an inner end of the restricting piece that bites into at least a pipe. A lock ring with a chamfered edge and a portion of the restriction piece that restricts biting into the pipe. 2. The chamfer has a radius of 0.02 to 0.2 m.
2. The lock ring according to claim 1, wherein the lock ring has an arc shape within a range of m. 3. The method according to claim 1, wherein at least an inner edge of the restricting piece of the lock ring that bites into the pipe and a portion of the restricting piece that restricts biting into the pipe are subjected to a barrel processing method.
A method for manufacturing a lock ring chamfered by a shot peening method or a sand blast method.