JPS6158714B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a tube fitting which is interposed between the outer circumferential surface of a pipe fitted into a joint body of a pipe joint and a tapered inner circumferential surface formed on an inner circumferential surface of the joint body. The present invention relates to a tube deviation prevention member having a wedge-shaped cross-section and having a tapered surface along the tapered inner circumferential surface on the outer circumferential side and a sawtooth protrusion that bites into the outer circumferential surface of the tube on the inner circumferential surface.

In this type of tube deviation prevention member for pipe joints, the tube deviation prevention member is a combination of an outer cylinder made of an elastic material having a tapered surface on the outer periphery and an inner cylinder made of metal having serrations on the inner periphery. This structure is easier to handle because it is lighter than one in which the tube deviation prevention member is made only of metal materials, and the outer tube made of elastic material and the inner tube made of metal can be separated and made separately. For example, the molded product is a mold for forming an outer cylinder made of an elastic material, compared to one in which a metal inner cylinder is placed in a mold for molding an outer cylinder made of an elastic material and integrally molded. It is desirable to construct a tube deviation prevention member using a combination of an elastic material and a metal material, since it has the advantage of being easy to manufacture.

Conventionally, the metal inner cylinder, which was constructed separately from the elastic outer cylinder of the tube deviation prevention member, was developed in U.S. Pat.
As shown in the technique disclosed in Publication No. 35619, a steel pipe or the like is cut to form bite protrusions that bite into the outer peripheral surface of the pipe, so it takes time to manufacture the bite protrusions. In addition, since the biting protrusion is a continuous protrusion along the circumferential direction, it is difficult to bite into the tube completely, and furthermore, since there is no biting protrusion on the outer surface that bites into the outer cylinder made of elastic material, There was a drawback that the locking effect on the outer cylinder made of elastic material was not reliable.

In view of the above-mentioned points, the present invention facilitates the production of the biting protrusion of the metal inner cylinder of the tube deviation prevention member, ensures reliable locking action with the outer cylinder made of elastic material, and furthermore, The present invention aims to provide a metal inner cylinder of a member for preventing pipe deviation from which the pipe can be reliably pulled out using the insertion protrusion.

The characteristic structure of the present invention for achieving the above object is as follows:
In the above-mentioned member for preventing deviation of a pipe in a pipe joint configured by a combination of an outer tube made of an elastic material and an inner tube made of metal, the inner tube made of metal is configured from a thin plate material, and the thin plate material The feature is that biting protrusions that protrude in opposite directions are formed by punching on both the front and back surfaces at appropriate intervals in the circumferential direction and the axial direction.

The effects of the above configuration are as follows.

By constructing the metal inner cylinder from a thin plate material, the biting protrusion can be formed at once using a press, making it easy to manufacture the biting protrusion.

In addition, since the biting protrusions are provided on both the front and back sides of the plate surface, when the tube is pulled out, the tip of each protrusion is pulled toward both the outer circumferential surface of the tube and the inner circumferential surface of the elastic outer cylinder. It is possible to prevent the pipe and the joint body from being pulled out by integrating the pipe and the joint body while preventing the pipe from biting into the pipe and from shifting its position relative to the outer cylinder made of an elastic material.

Furthermore, since the biting protrusions are independent from each other, they bite into the outer peripheral surface of the tube more easily than protrusions that are continuous in the circumferential direction of the tube. Since it is a biting protrusion with a bulging three-dimensional protruding curved surface, it will fall over when the protrusion is subjected to a force in the opposite direction to the tube extraction direction, for example, when a biting protrusion is formed by ejecting an upright tongue piece. The postures of the protrusions are maintained constant and strong, and it is possible to suppress the occurrence of a situation where the tube and the protrusion lose their mutual integrity and the tube is pulled out.

Embodiments of the present invention will be described below based on the drawings.

First Embodiment (See Figures 1 to 4) In Figure 1, 10 is a slip-on type pipe joint, 11 is a pipe joint body (hereinafter referred to as the socket body), and 12 is a socket inserted into the socket body 11. This is an O-ring for sealing the socket body 1.
A threaded portion 13 is provided at one end of the device 1, and a tapered surface 14 is formed on the inner periphery of the other end. Reference numeral 15 denotes a partially arcuate metal ring made of thin stainless steel material.

As shown in FIGS. 2 and 4, the outer and inner surfaces of the metal partial arc ring 15 have a large number of biting protrusions that have a triangular shape in side view with a gentle slope a on one side and a steep slope b on the other side. 16 and 17 are integrally arranged in a staggered manner, and cut and raised claw pieces 18 are provided at both ends in the circumferential direction.

The protrusions 16 and 17, which are triangular in side view and are formed in a staggered manner, are formed by elevating both the front and back surfaces of the thin plate material by embossing, and aligning the tube axis with respect to the cutting line C formed by embossing. The projections 16 and 17 are formed into a three-dimensional protruding curved surface in which the amount of protrusion decreases as the distance increases in the direction, and the protrusion directions of the protrusions 16 and 17 are opposite in the ring axis direction on the inner and outer surfaces, and the protrusions 17 on the inner surface are The protrusion 16 on the outer surface of the pipe 23 protrudes inward in a direction opposite to the direction in which the connected pipe 23 deviates from the connecting pipe 23 and contacts a partially arcuate ring 19 made of an elastic material, which will be described later. They are designed to bite into the elastic ring 19 in a direction that prevents the detachment action caused by the tube dislodgement force.

Reference numeral 19 denotes a partially arcuate ring made of hard plastic and having a wedge-shaped cross section.As shown in FIGS. 3 and 4, the outer periphery is a tapered surface that fits into the tapered surface 14 of the socket body 11 so as to be able to slide freely. The inner periphery is provided with a serrated circumferential groove 20 that engages with a protrusion 16 provided on the outer surface of the metallic partially arcuate ring 15.
Notches 21 are provided at both ends in the circumferential direction to fit with the raised claws 18 of the metallic partially arcuate ring 15.

Then, on the inner periphery of the partially arcuate ring 19 made of elastic material, the metal arcuate ring 15 fits its cut-and-raised claw pieces 18 into the notches 21 of the partially arcuate ring 19 made of elastic material. Protrusion 16 provided on the outer surface
is fitted into the groove 20 of the partially arcuate ring 19 made of an elastic material and is fixedly attached in such a manner as to prevent relative movement, thus forming the wedge ring 22 as a member for preventing pipe deviation. There is. Note that this wedge ring 22 is inserted into the tapered portion 14 within the socket body 11.

In the above configuration, the tapered surface 1 of the pipe joint 10
When inserting the hard plastic tube 23 into 4,
The wedge ring 22 is easily expanded by the tube 23 so that its tapered surface comes into close contact with the tapered surface 14 of the socket body 11, and the wedge ring 22 has a partially arcuate shape formed by a thin stainless steel plate located on the inner periphery of the wedge ring 22. A large number of protrusions 17 provided on the inner surface of the ring 15 bite into the outer circumferential surface of the tube 23 when the tube receives a force in the pulling direction, thereby fixing the hard plastic tube 23 inside the socket body 11. can. Regarding the second example (fifth example)
(See Figures to Figures 8) This second embodiment has a convex portion 31' at the end,
A thin-walled metal partially arc-shaped ring 15 according to the present invention is attached to a pipe joint 32 that connects a pipe 31 having an O-ring 37 inserted into the convex portion 31' and a straight hard plastic pipe 30. , shows an example using a wedge ring consisting of a partially arcuate ring 19 made of a hard elastic material.

5 to 8, 30 is a straight tube made of hard plastic, 31 is a tube having a hemispherical convex portion 31' at the end, 32 is a pipe joint, and 33 is a socket body of the pipe joint 32. As shown in FIG. 6, this socket main body 33 is divided into upper and lower halves, and is fitted onto the pipes 30 and 31 with bolts 34, and the inner surface of one end side has a tapered surface 35. The other end side 36 is connected to the pipe 3.
It is curved inward so as to fit into the semicircular convex portion 31' of No.1. 37 is the annular convex portion 3 of the tube 31
The sealing O-ring 38 inserted into the hole 1' is a partially arcuate stainless steel ring 15 having protrusions 16 and 17 on both sides, and a hard ring 38 having a groove 20 that engages with the outer protrusion 16, as in the previous embodiment. This is a wedge ring consisting of a plastic partially arcuate ring. Note that this wedge ring 38 is the eighth
As shown in the figure, it is divided into upper and lower halves, and is attached to the tapered surface of the socket body 33 so as to be slidable in the tube axis direction using a protrusion 39 formed on the socket body 33.

The method of connecting the pipe 30 and the pipe 31 is as follows:
After inserting the O-ring 37 into the convex portion 31' of the socket 1, the tube 30 is inserted into the tube 31, and then the end 36 of the socket body 33 with the wedge ring 38 fitted into the tapered surface 35 is inserted into the tube 31. Connect the socket body 33 to the pipes 30, 3 so as to fit into the convex portion 31' of the socket body 33.
1 from above and below, and finally the socket body 3
3 onto the tubes 30, 31 with bolts 34.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway vertical side view of a hard plastic tube inserted into a slip-on type pipe joint, Figure 2 is a perspective view of the inner cylinder forming the wedge ring, and Figure 3 is the outer cylinder. FIG. Fig. 4 is a partially enlarged sectional view of the wedge ring, Fig. 5 is a plan view of another embodiment, Fig. 6 is a side view thereof, Fig. 7 is a sectional view taken along the line A-A in Fig. 5, and Fig. 8 is a FIG. 6 is a sectional view taken along the line B--B in FIG. 6, FIG. 9 is an enlarged plan view of the main parts of the wedge ring, and FIG. 10 is an enlarged perspective view of the main parts of the wedge ring. 10... Pipe fitting, 11... Fitting body, 15...
Metal inner cylinder, 16, 17... biting protrusion, 19...
... Outer cylinder made of elastic material, 22 ... Pipe deviation prevention member, 2
3...Tube.

Claims (1)

[Claims] 1 Pipe 2 fitted into the joint body 11 of the pipe joint 10
3 and a tapered inner circumferential surface formed on the inner circumferential side of the joint body 11, and has a tapered surface along the tapered inner circumferential surface on the outer circumferential side, and , a tube deviation prevention member having a wedge-shaped cross section and having a sawtooth protrusion that bites into the outer circumferential surface of the tube 23 on the inner circumference side, and a partially arc-shaped member made of an elastic material and having a tapered surface portion on the outer circumference side It is constituted by a combination of an outer cylinder 19 and a metal inner cylinder 15 located on the inner peripheral side, and the metal inner cylinder 1
5 is made of a thin plate material, and on both the front and back surfaces of the thin plate material, biting protrusions 16 and 17 are formed by punching and projecting in opposite directions at appropriate intervals in the circumferential direction and the axial direction. A member for preventing pipe deviation in a pipe joint, characterized by being bulged.