JP2007170501A - Piping joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a piping joint which can achieve the stable catching action of a claw on the outside surface of piping and the stable looseness preventing action of the claw to the piping, and can reduce a required inserting load by reducing the elastic deformation resistance of the claw at inserting the piping into the claw, and can softly insert the piping into the claw by improving the insertion performance of the piping. <P>SOLUTION: The piping joint comprises an outer cylindrical portion, and a locking ring 40 which has a circular ring shape ring base 72 continued circumferentially, and has a plurality of claws 74 which are formed by being bent from the inner peripheral edge 78 of a circle in the ring base 72, and diagonally project in the radially inward direction in the inserting direction of the piping, and lock the piping so as to prevent the looseness of the piping by making the claws 74 cut into the outer surface of the inserted piping, wherein through holes 80 are formed at on the claws 74 at the central portion of the claws 74 in the direction of a width and at the base on the ring base 72 side so as to penetrate the claws 74 in the direction of its thickness. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pipe joint, and more particularly, to a pipe joint of a type in which a plurality of plate-like claws of a lock ring are bitten into the outer surface of a pipe to lock the pipe in a retaining state.

  Conventionally, (a) an outer cylinder part that forms a pipe insertion space inside, (b) an annular ring base part that is continuous in the circumferential direction, and a circular inner periphery of the ring base part that is bent to form a pipe insertion A lock ring that has a plurality of plate-like claws projecting diagonally inward in the radial direction, and that locks the pipe in a locked state by biting the claws into the outer surface of the pipe inserted into the insertion space. Piping joints provided are known.

FIG. 7 shows an example (disclosed in Patent Document 1 below).
In the figure, reference numeral 200 denotes an outer tube portion of the pipe joint 202, and an insertion space 206 for the pipe 204 is formed inside.
Reference numeral 208 denotes a lock ring held by the outer cylinder portion 200, and this pipe joint 202 locks the pipe 204 inserted into the insertion space 206 in a locked state by the lock ring 208.

The lock ring 208 is made of a thin metal plate as a whole, and is folded from a flat ring base 210 continuous in the circumferential direction and a circular inner peripheral edge 211 of the ring base 210 as shown in FIG. A plurality of thin plate-like claws 212 are bent along the ring base 210 and bent obliquely inward in the radial direction toward the insertion direction of the pipe 204, and on the outer surface of the pipe 204 inserted into the insertion space 206, The claws 212 are bitten to lock the pipes 204 in the removal state.
This type of pipe joint is widely used as a joint for resin pipes.

  However, this pipe joint 202 is inserted because the elastic deformation resistance of the claw 212 of the lock ring 208 when the pipe 204 is inserted into the insertion space 206 is large, that is, the required insertion load when inserting the pipe 204 is large. It was difficult to work and was insufficient in terms of insertability.

Therefore, as shown in FIG. 8, a circular cutout hole 214 is provided at the edge of the claw 212 in the width direction and at the root of the claw 212 so as to straddle the ring base 210, and the cutout hole 214 allows the claw 212 to be It has been proposed to reduce the elastic deformation resistance.
In this case, since the elastic deformation resistance of the claw 212 is reduced to some extent, the insertion property when the pipe 204 is inserted can be improved.

However, even in this case, it is difficult to sufficiently reduce the elastic deformation resistance of the claw 212 and sufficiently increase the insertion property of the pipe 204. Further, in the case of the lock ring 208 shown in FIG. When the width of the claw 212 becomes smaller at the root portion, the claw 212 is liable to be twisted.
Thus, if the claws 212 are twisted when the pipe 204 is inserted, there arises a problem that the removal preventing effect by the claws 212 cannot be obtained stably.

On the other hand, Patent Document 2 below discloses that a U-shaped notch 216 is provided through the ring base 210 from the outer periphery of the ring base 210 in the radial direction and into the claw 212 as shown in FIG. Yes.
The U-shaped notch 216 is also provided for the purpose of reducing the elastic deformation resistance of the claw 212 and improving the insertion property of the pipe 204.

However, in the case of the lock ring 208 shown in FIG. 9, by providing the U-shaped notch 216, the rigidity of the ring base 210 itself becomes weak, and the entire lock ring 208 is easily twisted.
Accordingly, the claw 212 is also easily twisted. Therefore, the lock ring 208 shown in FIG. 9 is also stabilized by the claw 212 because the claw 212 is twisted by receiving the force from the pipe 204 when the pipe 204 is inserted. There is a risk that it will not be possible to prevent the removal.

Japanese Patent Laid-Open No. 11-63347 Japanese Patent Laid-Open No. 11-351466

  The present invention is based on the circumstances as described above, and it is possible to obtain a stable biting action of the claw with respect to the outer surface of the pipe, that is, a stable removal action of the pipe by the claw, and an elastic deformation resistance of the claw when inserting the pipe. The purpose of the present invention is to provide a pipe joint that can be reduced in size to reduce the required insertion load of the pipe, and can be inserted softly by improving the insertability of the pipe.

  Thus, according to the first aspect of the present invention, (a) an outer cylindrical portion that forms an insertion space for piping inside, (b) an annular ring base continuous in the circumferential direction, and a circular inner periphery of the ring base A plurality of plate-like claws that are bent and project obliquely inward in the radial direction toward the pipe insertion direction, and the claws are bitten into the outer surface of the pipe inserted into the insertion space. A lock ring that locks the pipe in a retaining state, and a peripheral edge of the hole that penetrates the claw in the plate thickness direction at the center part in the width direction of the claw and at the root part on the ring base side Is provided with a closed hole.

  According to a second aspect of the present invention, in the first aspect, the hole is provided in a shape that spans the ring base portion.

  According to a third aspect of the present invention, in the second aspect of the present invention, the hole is provided in such a shape that the hole center is located on the circumference of the inner peripheral edge of the ring base.

Effects and effects of the invention

As described above, the present invention is such that a hole is formed in the center of the nail in the width direction and at the base on the ring base side, with the hole peripherally closed, penetrating the nail in the plate thickness direction. According to the present invention, the elastic deformation resistance of the nail can be reduced by removing the nail from the ring base while ensuring a large width dimension between both ends of the nail along the inner peripheral edge of the ring base. Can be effectively reduced.
Therefore, the required insertion load when inserting the pipe can be reduced, and the insertability can be improved.

Further, in the present invention, the width dimension between the both ends of the claw is not changed by the formation of the hole as described above, that is, according to the present invention, the width dimension between the both ends of the claw can be kept large. It is possible to effectively suppress the claw from causing torsional deformation during work.
Therefore, it is possible to stably secure the claw biting action on the pipe outer surface due to the torsional deformation of the claw, that is, the pipe pull-out preventing action.

  Furthermore, in the present invention, since the elastic deformation resistance of the claw can be reduced while maintaining the rigidity of the ring base at a high rigidity, each claw is twisted due to the rigidity reduction of the ring base and the torsional deformation of the entire lock ring based on this. And the problem of destabilizing the locking action by the lock ring does not occur.

In the present invention, the hole can be provided in a shape that spans the ring base (claim 2).
That is, a hole can be provided in the shape of the bent portion of the nail.
By doing in this way, the elastic deformation resistance of a nail | claw can be reduced more effectively, therefore the insertion property of piping can be improved more effectively.

Further, in this case, the hole can be provided in such a shape that the hole center is located on the circumference of the inner peripheral edge of the ring base, that is, on the bent line of the claw.
By doing in this way, the elastic deformation resistance of a nail | claw can be made further smaller and the insertion property of piping can be improved further.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIGS. 1 and 2, 10 is a metal pipe joint, 12 is a joint body, and has a flange-shaped large-diameter tool hooking portion 14 on the outer peripheral surface on the right side of the tool hooking portion 14 in the drawing. A male screw 16 is provided.
Further, a cylindrical inner cylinder portion 18 is integrally provided on the left side in the drawing opposite to the male screw 16.
The resin pipe 20 is extrapolated from the axial direction in an externally fitted state to the inner cylindrical portion 18 and is connected to the inner cylindrical portion 18.
Here, a pair of O-ring grooves (holding grooves) 22-1 and 22-2 are formed on the outer peripheral surface of the inner cylindrical portion 18 with an interval in the axial direction, and an annular seal member having elasticity therein. O-rings 24-1 and 24-2 are held.

Reference numeral 26 denotes an outer cylinder portion provided in the pipe joint 10, which is composed of an outer sleeve 28 and an inner sleeve 30. An insertion space 32 for the resin pipe 20 is formed between the inner sleeve 30 and the inner cylinder portion 18. ing.
The outer sleeve 28 has a female thread 34 at the right end in the figure, and is screwed and fixed to the male thread 36 of the joint body 12 at the female thread 34.
A stepped-shaped first clamping portion 38 is formed at the opposite end of the outer sleeve 28, that is, the left end in the figure, and the first clamping portion 38 is configured by the end of the inner sleeve 30. A ring base portion 72 (see FIG. 4) of a metal disc spring-like lock ring 40 (to be described later) is held in the axial direction together with the second holding portion 39.
The outer sleeve 28 is further formed with a first engagement portion 42 and a second engagement portion 44, and a backup ring 46 that backs up the lock ring 40 is secured in the first engagement portion 42. Furthermore, in the second engagement portion 44, the release member 48 for unlocking by the lock ring 40 is prevented from being pulled out.

Here, the release member 48 is provided with an engaged portion 50, and the engaged portion 50 is engaged with the second engagement portion 44, and the release member 48 is engaged with the outer sleeve 28 by their engaging action. That is, it is prevented from being pulled out from the outer cylinder portion 26.
Here, the release member 48 can move by a predetermined stroke in the left-right direction in the figure. By pushing the release member 48 in the right direction in the figure, a later-described claw 74 of the lock ring 40 is pushed with elastic deformation. It is expanded and the lock to the pipe 20 by the lock ring 40 is released.

Reference numeral 54 denotes a metal coil spring fitted to the inner cylindrical portion 18 on the outer peripheral side of the O-rings 24-1 and 24-2.
As shown in FIG. 3, the coil spring 54 has a tightly wound portion 58 formed by tightly winding without causing a gap between adjacent coils 56 and 56, and a gap between the coils 56 and 56. And the sparsely wound portion 60 which is sparsely wound in a state of forming the sparsely wound portion 60, and the densely wound portion 58 is disposed on the side of the distal end surface 20A (see FIG. 2) of the pipe 20 before insertion and the sparsely wound portion 60 Is fitted on the outer peripheral side of the O-rings 24-1 and 24-2.

When the distal end surface 20A of the pipe 20 is cut obliquely, the coil spring 54 is inserted into the insertion space 32 so that the pipe 20 is fitted to the inner cylindrical portion 18 in an externally fitted state. At this time, the O-rings 24-1 and 24-2 are provided to prevent the O-rings 24-1 and 24-2 from being lifted from the O-ring grooves 22-1 and 22-2 at the oblique tip surface 20 </ b> A.
Specifically, the O-rings 24-1 and 24-2 are covered with the O-rings 24-1 and 24-2 from the outside at the densely wound portion 58 when the pipe 20 is inserted. Lifts up from 2 and prevents it from protruding.

  As shown in FIGS. 1 and 2, the outer cylindrical portion 26 in the pipe joint 10, specifically, the inner peripheral surface of the inner sleeve 30, is large at the back of the insertion space 32 on the side opposite to the insertion side of the pipe 20. A diameter portion 62 is formed, and a small diameter portion 64 is formed on the insertion side, and a stepped portion 66 is formed therebetween.

On the other hand, the coil spring 54 also has a large diameter portion 68 on the right side and a small diameter portion 70 on the left side in the drawing.
As a result of the configuration of the coil spring 54, the large diameter portion 68 hits the stepped portion 66 of the inner sleeve 30 while being fitted to the pipe joint 10, thereby preventing the coil spring 54 from falling off the pipe joint 10. .

The structure of the disc spring-like lock ring 40 is specifically shown in FIG.
As shown in the figure, the lock ring 40 is bent at a predetermined angle by a flat ring base portion 72 having an annular shape continuous in the circumferential direction and a circular inner peripheral edge 78 of the ring base portion 72. It has a plurality of claws 74 formed obliquely inwardly in the radial direction toward the direction and formed side by side in the circumferential direction along the ring base 72.
A slit-shaped notch 76 is provided between the claws 74 and 74, and the elastic deformability is given to each of the claws 74 by the notches 76.
Here, the lock ring 40 is formed by punching and bending a metal plate, and both the ring base portion 72 and the claw 74 have a thin plate shape.

The lock ring 40 allows the insertion of the pipe 20 by elastically deforming the claws 74 in the insertion direction of the pipe 20 when the pipe 20 is inserted.
On the other hand, when a pulling direction force is applied to the pipe 20 after insertion, each of the claws 74 bites into the outer surface of the pipe 20 to prevent the pipe 20 from coming off.
That is, it functions to lock the pipe 20 in the retaining state.

In the present embodiment, as shown in FIG. 4, small circular holes 80 penetrating in the plate thickness direction are provided at the bases of the claws 74 on the ring base 72 side.
Here, the hole 80 is provided just in the center in the width direction along the circumferential direction of the claw 74.
The hole 80 is provided in a shape that spans the ring base 72. Specifically, in this embodiment, the hole center of the hole 80 is provided in a shape that is located exactly on the circumference of the inner peripheral edge 78 of the ring base 72.

  As a result, each claw 74 has a width dimension between both ends along the circumferential direction that is the same as that in the case where the hole 80 is not provided, but the bent portion ( Therefore, when the pipe 20 is inserted into the insertion space 32, the claws 74 are easily elastically deformed by the pipe 20 as shown in FIG. Thus, the pipe 20 can be easily inserted into the insertion space 32 with a small insertion load.

For example, in the case of the lock ring 208 shown in FIG. 8, the bent portion of the claw 212 (the position of the inner peripheral edge 211) has a planar arc shape as shown in FIG. When elastically deforming around the bent portion, the arc-shaped portion elastically bends and deforms.
At this time, the arc shape of the bent portion serves as a resistance against the elastic deformation of the claw 212, and acts to increase the resistance against the elastic deformation of the claw 212.

  However, in the present embodiment, the hole 80 is provided in the central portion in the width direction of the claw 74, and the hole 80 divides the root portion of the claw 74 in the width direction. Therefore, the root of the claw 74 divided by the hole 80 is provided. The planar shape of the bent portion of each half of the portion is approximately a linear shape, so that the resistance of bending to the claw 74 is reduced, and the claw 74 can be easily elastically deformed.

  Further, since the claw 74 has a width dimension between both ends in the circumferential direction that is the same as that when the hole 80 is not provided, the claw 74 itself has a large deformation resistance against torsion, and the lock ring shown in FIG. Unlike the claws 212 of 208, the claws 74 are prevented from being twisted during piping work.

  Unlike the lock ring 208 shown in FIG. 9 having a U-shaped notch penetrating the ring base 72 in the radial direction, the ring base 72 itself has high rigidity. Since the ring base 72 is firmly supported, the claw 74 is also prevented from being twisted or other irregular deformation based on the torsional deformation of the entire ring base 72 or the partial torsional deformation of the ring base 72 near the claw 74. Is done.

According to this embodiment, the required insertion load when inserting the pipe 20 into the insertion space 32 can be reduced, and the insertability can be improved.
Further, according to the present embodiment, the claw 74 undergoes torsional deformation during the piping work, so that the problem that the claw 74 bites into the outer surface of the pipe 20, that is, the retaining action of the pipe 20 becomes unstable, does not occur. Can be stably locked in the retaining state.

In the above embodiment, the hole 80 is provided at the base of the claw 74 so that the center of the hole is positioned just on the circumference of the inner peripheral edge 78 of the ring base 72. As shown in FIG. 7, the hole center may be provided in a shape that does not coincide with the inner peripheral edge 78 and that extends over the ring base 72.
Alternatively, as shown in (B), the hole 80 can be provided at the root of the claw 74 in a shape that does not extend over the ring base 72.

When the claw 74 is elastically deformed so as to increase its bending angle, the claw 74 is not deformed only at the bent portion, that is, at the inner peripheral edge 78 of the ring base 72, but with elastic deformation in the vicinity thereof. The claw 74 is elastically deformed as a whole.
Therefore, even when the hole 80 is provided as shown in FIGS. 6A and 6B, the resistance against the elastic deformation of the claw 74 can be reduced, and a certain effect can be obtained in improving the insertion property of the pipe 20. Can be played.

  Although the embodiments of the present invention have been described in detail above, these are merely examples, and the present invention can be configured in various modifications without departing from the spirit of the present invention.

It is a figure which partially cuts and shows the piping joint of one Embodiment of this invention in a piping connection state. It is sectional drawing which shows the piping joint of the embodiment in the state before piping connection. It is a perspective view which decomposes | disassembles and shows the piping joint in the same embodiment. It is a figure which shows the lock ring in the same embodiment separately. It is action | operation explanatory drawing of the lock ring in the same embodiment. It is a figure of the principal part of other embodiment of this invention. It is a figure which shows the conventional piping joint. It is a figure which shows an example of the conventionally well-known lock ring different from FIG. It is a figure which shows an example of the conventionally well-known lock ring different from FIG.7 and FIG.8.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Piping joint 20 Piping 26 Outer cylinder part 32 Insertion space 40 Lock ring 72 Ring base part 74 Claw 78 Inner peripheral edge 80 Hole

Claims (3)

(a) an outer cylinder part that forms an insertion space for pipes on the inner side, (b) an annular ring base part that is continuous in the circumferential direction, and a circular inner periphery of the ring base part that is bent to form the pipe insertion A lock that has a plurality of plate-like claws protruding obliquely inward in the radial direction toward the direction, and locks the pipe in a locked state by biting the claws into the outer surface of the pipe inserted into the insertion space In a pipe joint comprising a ring,
A pipe joint comprising a hole in the center of the claw in the width direction and a base portion on the ring base side, which has a shape with a closed hole periphery that penetrates the claw in the plate thickness direction.   2. The pipe joint according to claim 1, wherein the hole is formed in a shape straddling the ring base.   3. The pipe joint according to claim 2, wherein the hole is provided in a shape in which a hole center is located on a circumference of an inner peripheral edge of the ring base.

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