JPH03265792A - Pipe fitting - Google Patents

Abstract

PURPOSE:To firmly retain the pipe inserted in a socket over a specified length by equipping it with an opening, which pierces the circumference of the socket, and a stopping pin, which is set in the longitudinal direction of the opening and is welded with pressure to the periphery of the pipe. CONSTITUTION:A pair of openings 11a and 11a are provided at positions opposed to each other in a socket 11. Each opening 11a is long in the direction perpendicular to the axial direction of the pipe fitting 10, and each opening 11a is piercing the periphery of the socket 11. A nearly U-shaped stopping pin 30 is attached to the socket 11. For the stopping pin 30, the top of each linear side part 31 being parallel with each other is set in each opening 11a, and a coupling part 32, which couples each side part 31, is positioned outside the socket 11, in the condition that it has space to the periphery of the socket 11. Since the pipe is prevented from slip out by setting the stopping pin in the opening provided at the socket this way thereby pressure-contacting the stopping pin to the periphery of the pipe inserted in the socket, there is no fear of the pipe slipping out of the socket of the pipe fitting.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates primarily to a pipe joint used for connecting pipe bodies made of resin such as vinyl chloride (PVC).

(Prior art) Adhesive joints and fusion pipe joints are conventionally known as pipe joints used to connect synthetic resin pipe bodies or between synthetic resin pipe bodies and equipment. .

An example of a conventional adhesively bonded pipe joint is shown in FIG.

This adhesive joint pipe joint 73 is made of synthetic resin and has a cylindrical shape.
It is now 3a. A protrusion 73b that protrudes inward is provided on the inner peripheral surface of the central portion of the pipe joint 730 in the axial direction. When connecting the tube body 71 to each receiving lower 3a of such a pipe joint 73, adhesive 72 is applied to the inner peripheral surface of each receiving lower 3a in advance, and each tube body 71 to be joined is Adhesive 72 is also applied in advance to the outer peripheral surface of. In this state, the tube body 71 is inserted and connected to the lower receiving part 3a.

(Problems to be Solved by the Invention) In such conventional pipe joints, the pipe bodies are joined by inserting the pipe bodies into the sockets of the pipe joints. However, if the end of the tube body is not fully inserted into the socket of the tube joint, there is a possibility that the tube body may come off from the tube joint due to a slight force being applied to the tube body in the direction of pulling the tube body out of the tube joint. Therefore, 1-2 With such conventional pipe joints, sufficient joint strength cannot be obtained unless the end of the tube body is inserted over a sufficient length into the socket of the pipe joint at the time of joining.

Furthermore, uneven application of the adhesive to the inner circumferential surface of the receptacle or the outer circumferential surface of the end of the tube, or failure to apply the adhesive itself, often occurs. In this case, the pressure of the liquid flowing through the tube may easily cause the tube to fall off the joint, and the liquid flowing through the tube may flow out around the joint.

The present invention solves the above-mentioned conventional problems, and its purpose is to provide a pipe joint that can firmly hold a pipe inserted into a socket over a predetermined length within the socket.

(Means for Solving the Problems) The pipe joint of the present invention is a pipe joint having a socket into which an end of a pipe body to be connected is inserted, and the pipe joint is provided so as to penetrate through the circumferential surface of the socket. The tube has an opening extending in a direction perpendicular to the axial direction, and an opening that is fitted along the longitudinal direction of the opening and is pressed against the outer circumferential surface of the end of the tube inserted into the socket. A locking pin is provided, whereby the above object is achieved.

(Example) The pipe joint of the present invention is used, for example, to connect pipe bodies made of synthetic resin. As shown in FIGS. 1 and 2, the pipe joint 10 of the present invention is formed of synthetic resin into a straight pipe shape. The pipe joint 1° has sockets 11 on each side in the axial direction. A protrusion 13 that protrudes inward is provided on the inner peripheral surface of the central portion in the axial direction over the entire circumference.

A pair of openings 11a and lla are provided at mutually opposing positions in each socket 11, respectively.

Each opening 11a is elongated in a direction perpendicular to the axial direction of the pipe joint 10, and each opening 11a is longer than the socket 11.
It passes through the circumferential surface of.

Each socket 11 has a U-shaped retaining pin 30.
are attached to each. Each retaining pin 30 has a tip 3-4- end portion of each parallel linear side portion 31 fitted into each opening 11a, and a curved line connecting each side portion 31 to each other. shaped or linear connecting portion 32
However, it is located on the outside of the socket 11 with a gap between it and the outer peripheral surface of the socket 11 . The distal end portion of each side portion 31 of the retaining pin 30 passes through each opening 11a and is positioned within the socket 11. Each retaining pin 3
The interval between each side portion 31 of 0 is slightly smaller than the outer diameter of the tube body 20 inserted into the socket 11,
The distal end portion of the tube body 20 is inserted into each socket ll.
It is firmly pressed against the outer circumferential surface of the end.

In the pipe fitting 10 having such a configuration, an adhesive is applied in advance to the inner circumferential surface of each socket 11 and the outer circumferential surface of the end of the pipe body 20 to be connected. With pins 30 and 30 removed, the end of tube 20 is inserted into each socket 11. At this time, it is visually confirmed that the end of each tube 20 inserted into each socket 11 has passed through each opening 11a facing each other, and the end of each tube 20 has a predetermined length. It is inserted into each receptacle 11 across the length. When the ends of the tube bodies 20 are respectively inserted into the sockets 11 over a predetermined length, the tips of the respective side parts 31 of the retaining pins 30 face each other in the sockets 11. It is fitted into the opening 11a. At this time, the tip of each side portion 31 of each retaining pin 30 is coated with adhesive in advance, and the retaining pin 30 fitted into each opening 11a
The tip of each side portion 31 is firmly pressed to the outer peripheral surface of the end of the tube body 20 inserted into the socket 11 via an adhesive,
Both are reliably bonded with adhesive.

In this way, the outer circumferential surface of the end of each tube 20 inserted into the socket 11 is strongly pressed and held by each side 31 of the retaining pin 30, so that each tube body 2
There is no fear that 0 will fall out from the socket 11. In addition, since each side portion 31 of each retaining pin 30 and the outer peripheral surface of the tube body 20 inserted into the socket 11 are bonded with adhesive, the tube body 20 is prevented from coming off. will be demonstrated more reliably. Retaining pin 30 in each socket 11
By having the pipe body 20 installed, it can be easily confirmed visually that the pipe body 20 is prevented from coming off, which also has the advantage of facilitating construction management. .

In addition, by setting the interval 11 (see FIG. 1) between the openings 11a of the respective sockets 11 in the pipe joint 10 to the interval between the open ends of the respective sockets in a conventional pipe joint, the pipe body of the pipe joint 10 can be A bonding strength of 20 can be secured.

FIG. 3 is a sectional view of another embodiment of the pipe joint of the present invention.

In this embodiment, recesses 31a into which the outer circumferential surface of the tubular body 20 is fitted are formed inside the vicinity of the tip of each side 31 of the retaining pin 30.

By forming such a recess 31a, the adhesive 4
Tube body 20 by each side 31 of retaining pin 30 by 0
In order to increase the pressure welding distance to the outer circumferential surface, the retaining pin 30
This makes it possible to further ensure that the tube body 20 is prevented from coming off.

FIGS. 4(a) to 4(C) show still another embodiment of the pipe joint of the present invention, and in this embodiment, the retaining pin 30
Each opening 11a into which each side portion 31 of is fitted is,
The cover 7 is covered with a cover 12 except for each end in the longitudinal direction. Providing such a cover portion 12 has the effect that each side portion 31 of the retaining pin 30 is difficult to slip out from the opening 11a.

Note that the retaining pin 30 is manufactured by integrally molding a single material such as plastic. Also,
As shown in FIG. 5, in the retaining pin 30 provided with the recesses 31a into which the outer peripheral surface of the tube body 20 is fitted, each recess 31a
An elastic body 33 made of rubber or the like may be attached to each of the parts. The retaining pin 30 is attached to each side portion 31 and the tube body 20.
There is no need to bond the outer circumferential surface with an adhesive, and by strongly pressing each side portion 31 of the retaining pin 30 against the outer circumferential surface of the tube body 20, the tube body 20 can be prevented from coming off.

Further, the present invention is of course applicable not only to straight pipe joints as in the above-mentioned embodiments, but also to elbow type, cheese type, reducer type, etc. pipe joints.

(Effects of the Invention) In this way, the pipe joint of the present invention has a retaining pin fitted into the opening provided in the socket, and the retaining pin is inserted into the outer circumferential surface of the pipe body inserted into the socket. Since the tube body is prevented from coming off by being pressed against it, there is no risk that the tube body will fall out from the socket of the pipe joint.

Furthermore, since it can be easily confirmed visually that the retaining pin is fitted into the opening, there is an advantage that construction management is facilitated.

Figure 1 is a side view showing an example of the pipe joint of the present invention, Figure 2 is a sectional view taken along the line ■-■, and Figure 3 is a side view of another embodiment of the pipe joint of the present invention. The cross-sectional views of FIGS. 4(a) to 4(C) show still other embodiments of the pipe joint of the present invention, and FIG.
a) is a side view of the pipe joint, FIG. 4(b) is a plan view thereof, FIG. 4(C) is a cross-sectional view thereof, and FIG. 5 is a diagram of the retaining pin used in the pipe joint of the present invention. A front view showing a modification, and FIG. 6 is a partially cutaway side view of a conventional pipe joint.

DESCRIPTION OF SYMBOLS 10... Pipe joint, 11... Socket, lla... Opening, 12... Part of cover, 20... Pipe body, 30...
- Retaining pin, 31... side part, 31a... recessed part,
32... Connecting portion, 40... Adhesive.

that's all

Claims (1)

[Claims] 1. A pipe joint having a socket into which the end of the pipe body to be connected is inserted, which is provided so as to penetrate the circumferential surface of the socket, and is perpendicular to the axial direction. A pipe joint comprising: an opening extending in the direction of the opening; and a retaining pin that is fitted along the longitudinal direction of the opening and is pressed against the outer peripheral surface of the end of the pipe inserted into the socket. .