JP4422059B2 - Piping joint - Google Patents

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 an insertion space for pipes on the inner side, and (b) a plurality of plate-like claws protruding obliquely inward in the radial direction toward the insertion direction of the pipes, the insertion space 2. Description of the Related Art A pipe joint including a lock ring that locks a pipe in a non-blocking state by causing a claw to bite into the outer surface of the pipe inserted into the pipe is 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.

  As shown in FIG. 7B, the lock ring 208 includes a flat ring base 210 that is continuous in the circumferential direction, and a plate that obliquely projects radially inward from the ring base 210 toward the insertion direction of the pipe 204. A plurality of the claw 212 is provided along the ring base 210, and the claw 212 is bitten into the outer surface of the pipe 204 inserted into the insertion space 206 to lock the pipe 204 in a non-blocking state.

This type of pipe joint is widely used as a joint for resin pipes, but the plate-like claw 212 of the lock ring 208 is thin and weak in strength, and the claw 212 is pulled by the force in the drawing direction of the pipe 204. Has caused a problem that the claw 212 easily bends.
In addition, the claw 212 has a plate shape, and there is a problem that the pipe is damaged by being deeply digged into the outer surface of the resin pipe.

Japanese Patent Laid-Open No. 11-63347

  The present invention is based on the above circumstances, and the lock ring claw has high strength, so that the claw can be prevented from being deformed when the claw is bitten into the outer surface of the pipe, and the claw bites into the outer surface of the pipe deeply. The object of the present invention is to provide a pipe joint that can solve the problem of excessively damaging the pipe.

Thus, according to the first aspect of the present invention, (a) an outer cylinder part that forms an insertion space for a pipe on the inner side, and (b) a plate-like shape that projects obliquely inward in the radial direction toward the insertion direction of the pipe. A pipe joint having a plurality of claws, and having a lock ring that locks the pipe in a non-blocking state by biting the claws into the outer surface of the pipe inserted into the insertion space, from the tip of the claw Protrusions projecting in the plate thickness direction are provided at sites separated on the root side, and the projecting parts have a partially spherical shape formed by denting one surface of the claw and projecting the opposite surface. It is characterized by being.

  According to a second aspect of the present invention, in the first aspect, the projecting portion is provided on a surface opposite to a tip of the pipe inserted into the insertion space.

Effects and effects of the invention

  As described above, according to the present invention, a protrusion protruding in the thickness direction is provided at a portion of the lock ring that is spaced from the tip toward the root side. Even when a strong force is applied to the claws when a force in the pulling direction is applied to the pipe, deformation of the claws can be effectively prevented.

  In addition, after the tip of the claw bites into the outer surface of the pipe, this projection can hit the outer surface of the pipe, preventing the claw from biting into the pipe more than necessary, which causes the claw to bite deeply into the pipe. The problem of damaging the piping can also be solved.

Here, it is desirable that the protruding portion is provided on a surface opposite to the tip of the pipe inserted into the insertion space (claim 2).
By doing in this way, the reinforcement effect of the nail | claw by this protrusion part can be heightened, and it can prevent more effectively that a nail | claw deform | transforms with the force of the extraction direction with respect to piping.

  The surface of the claw on the side opposite to the tip of the pipe inserted into the insertion space becomes the compression side surface when the pipe is pulled out, and thus the protrusion is provided on the compression side surface. The deformation resistance of the claw due to the above can be increased more effectively, and this can prevent the deformation of the claw more effectively when a pulling force is applied to the pipe.

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 72 (FIG. 4) of a metal disc spring-like lock ring 40, which will be described later, is clamped and held in the axial direction together with the second clamping 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.

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 cylinder portion 18 in an axially 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. It is made into the diameter part 62, and is made into the small diameter part 64 in the insertion side, and the step part 66 is formed among them.

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 in a state in which the coil spring 54 is 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 protrudes obliquely inward in the radial direction from the ring base 72 toward the insertion direction of the pipe 20, and a flat ring base 72 having an annular shape continuous in the circumferential direction. In the form, it has a plurality of claws 74 formed along the circumferential direction along the ring base 72.
A notch-shaped cut 76 is provided between the claws 74 and 74, and the elastic deformation ability is given to each of the claws 74 by the cuts 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, a protruding portion 82 is provided on one surface of each claw 74, specifically, a surface 78 on the opposite side to the tip of the pipe 20 inserted into the insertion space 32. Here, the projecting portion 82 is provided at a site separated from the tip of the claw 74 toward the root side.
The projection 82 is formed by projecting the claw 74 into the surface 78 by denting the surface 80 opposite to the surface 78, that is, the surface 80 on the distal end side of the pipe 20. In this embodiment, the projection 82 is a partial portion. It is formed in a spherical shape.

  In the present embodiment, as shown in FIG. 5B, when the protrusions 82 are provided on the claws 74 as described above, a force in the pulling direction is applied to the pipe 20 inserted into the insertion space 32. When a predetermined amount of the tip of the claw 74 bites into the outer surface of the pipe 20, the protrusion 82 hits the outer surface of the pipe 20, and further biting of the claw 74 is prevented.

According to this embodiment as described above, the protrusion 82 is provided on the claw 74, particularly on the surface 80 opposite to the tip of the inserted pipe 20, whereby the strength of the claw 74 can be increased. It is possible to effectively prevent the claw 74 from being deformed when a force in the pulling direction is applied to the pipe 20 and a strong force is applied to the claw 74.
Moreover, since the protrusion part 82 is formed in the compression side surface of the nail | claw 74, the deformation resistance of the nail | claw 74 is increased more effectively and the deformation | transformation of the nail | claw 74 is prevented more effectively.

  Further, since the protrusion 82 hits the outer surface of the pipe 20 after the tip of the claw 74 has bite into the outer surface of the pipe 20, the claw 74 is prevented from biting into the pipe 20 more than necessary. The problem of damaging the pipe 20 due to excessive biting can also be solved.

FIG. 6 shows another embodiment of the present invention.
In this example, a protrusion 82 is provided on the surface 80 on the opposite side of the claw 74 from the above-described embodiment, that is, on the distal end side of the inserted pipe 20.
Even in this case, excessive protrusion of the claw 74 into the pipe 20 can be prevented by the protrusion 82, and the claw 74 can be reinforced by the protrusion 82. Deformation can be prevented.

  Although the embodiment of the present invention has been described in detail above, these are merely examples, and the present invention can make the shape of the protruding portion 82 various shapes other than the above examples, and the scope without departing from the gist thereof. It can be configured with various modifications.

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 operation | movement explanatory drawing of the embodiment. It is a figure of other embodiment of this invention. It is a figure which shows the conventional piping joint.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Piping joint 20 Piping 26 Outer cylinder part 32 Insertion space 40 Lock ring 74 Claw 78, 80 Surface 82 Protrusion part

Claims (2)

(a) an outer cylinder part that forms an insertion space for piping on the inner side, and (b) a plurality of plate-like claws protruding obliquely inward in the radial direction toward the insertion direction of the piping, and the insertion space In a pipe joint provided with a lock ring that bites the claw into the outer surface of the pipe inserted into the pipe and locks the pipe in a locked-out state, a portion of the claw spaced apart from the tip to the root side in the thickness direction A pipe joint characterized by providing a projecting portion that projects, and the projecting portion has a partially spherical shape formed by denting one surface of the claw and projecting the opposite surface .   The pipe joint according to claim 1, wherein the protrusion is provided on a surface opposite to a tip of the pipe inserted into the insertion space.

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