JP3379889B2 - Fitting for soft synthetic resin pipe - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint used for connecting soft synthetic resin pipes, for example, polyethylene pipes for water supply, to each other. 2. Description of the Related Art Conventionally, when connecting polyethylene pipes at the time of constructing water supply pipes, an electrothermal fusion method has been used. In this method, a socket made of a thermoplastic synthetic resin is fitted over the outer surface of the mating portion of both pipes, and then a heating wire previously embedded in the socket is energized, and the resin is heated by the heat generated. And the two tubes and the socket are fused together. [0003] However, in the case of the above-mentioned electrothermal fusion method, in order to increase the fusion bonding accuracy, each joint surface between the tube and the socket is fused using acetone or the like. It is necessary to clean before putting on. However, water works are usually performed in open pits. For this reason, in the case of work under adverse effects such as rainfall, muddy water is likely to be applied to the joint of pipes, and in the case of existing pipes, water flows out from the pipe end, Cannot be completely cleaned,
As a result, there is a problem that connection failure is likely to occur and construction reliability is low. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a joint for a soft synthetic resin pipe having high construction reliability, which can reliably connect the soft synthetic resin pipes to each other by a mechanical connection method. Another object of the present invention is to provide a joint for a soft synthetic resin pipe which can be easily connected with a pipe, has a high bonding strength, and does not easily come off. [0005] The technical means of the joint of the present invention is a socket having a pipe joint on both sides, an outer ring fitted on the outer surface of the pipe end, and tightened by wedge action. Split lock ring and lock bolt attached to outer ring
And a flange with an annular groove in the center of the socket
It is formed, and the tip of the stop bolt fits into this groove,
In addition, a large diameter portion is formed on the inner side of the outer ring.
The split lock ring fits into the inner surface of the enlarged diameter part of
The outer surface of the socket is uneven, the tube end is pinched from both sides by the socket, the outer ring and the split lock ring, and the inner wall of the tube is cut into the uneven surface of the socket. Is to become. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a joint for a flexible synthetic resin pipe according to the present invention will be described with reference to the drawings. FIG.
3 to 3 show embodiments of the present invention. In the figure, A, B
Are soft synthetic resin pipes on the left and right to be connected, and 1 is a joint. The joint 1 includes a socket 2 made of a rigid material such as a hard synthetic resin or a metal, a pair of left and right outer rings 3, a split lock ring 4, a stop bolt 8, and the like. The socket 2 has a flange 21 serving as a pipe insertion stopper at the center thereof, and a pipe connecting portion 22 on each of the left and right sides thereof. . In the embodiment, several convex stripes having a trapezoidal cross section are formed as the concave-convex surface 23. However, the shape of the concave-convex is free, and it is also possible to form a screw-like shape. The point is that when the pipe is fitted, the inner surface of the pipe may be appropriately bitten into the unevenness to prevent the pipe from coming off, and the pipe may not be broken at the biting portion. The outer diameter of the socket 2 is slightly larger than the inner diameter of the tube. In addition, the flange 21 of the socket
Has a wide width, and a groove 24 is formed on its outer peripheral surface in an annular shape.
Has been established. The outer ring 3 serves to press-fit the outside of the tube end fitted in the socket so as to press the end of the tube so as not to expand outward. Also, an enlarged diameter portion is provided on the inner side of the outer ring 3.
31 is provided, the inner surface of which is an inclined surface 32,
The split lock ring 4 fits into the inclined surface 32.
You. The split lock ring 4 has a split structure, in which the inner wall surface is formed with irregularities 41 for retaining the same, and the outer wall surface is formed with an inclined surface 4.
It is 2. Therefore, at the time of coupling, both inclined surfaces 32,
42 engage each other to produce a wedge effect. Furthermore,
A stop bolt 8 is screwed into the end of the enlarged diameter portion 31 of the outer ring 3.
When the stop bolt 8 is tightened in the completely fitted state,
The tip of the bolt fits into the groove 24 of the socket, and the ring
Is determined. Next, a pipe connecting method using the joint will be described with reference to FIG. First, the outer ring 3 is fitted into both tubes A and B in advance. Next, the ends of the left and right tubes A and B are
It is fitted on both sides of the socket 2. Since a considerable amount of force is required for this cladding and it is impossible to perform it manually, usually, the pushing device 90 is used.
Use The pushing device 90 includes a pair of left and right chucks 51.
, A hydraulic cylinder 92, a pull rod 93, and a manual oil pump 94. FIG. 3A shows a state in which the pipe end is pushed into the socket 2. The ends of both tubes A and B are addressed to both ends of the socket 2, and the chucks 91 are attached to both tubes in a holding manner. Note that the contact surface of the chuck 91 is a friction surface having minute irregularities so that slippage does not occur at the time of pushing. Next, when the pump 94 is operated to feed oil to the cylinder 92, the rod 93 is pulled and a pulling force acts between the two chucks, so that the two tubes A and B are connected to the socket 2
Press fit. Once the end of the tube has been fitted until it collides with the collar 21, the pushing device 90 is once removed. [0011] Subsequently, as shown in b of FIG. 3, Rutotomoni moves the outer ring 3 to the end of the fitted around portion, a split lock ring 4
After pushing to the side of the flange 21, the pushing device 90 is set again. However, at this time, since the chuck 91 is used as a pushing body of the outer ring 3, the chuck 91 does not hold the tubes A and B. Next, when the pump 94 is operated to feed oil, a pulling force acts between the two chucks in the same manner as described above, so that the outer ring 3 is press-fitted outside the fitting connection between the tube and the socket.
By the press-fitting of this outer ring, the wedge action works,
The split lock ring 4 is strongly pushed inward, and the unevenness 41
Bites into the outer surface of the tube. After completely pushing the outer ring 3
In addition, as shown in FIG.
Secure the outer ring as follows. Finally, the pushing device 90
Remove and the connection is complete. In the connected state, both ends of the tubes A and B are strongly sandwiched from both sides by the socket 2 on the inner surface and the outer ring 3 and the lock ring 4 on the outer surface, so that even if a large force acts, the tubes may come out. There is no. The present invention is not limited to the above embodiment, but can be freely modified and implemented within the scope of the claims. In particular, socket 2, outer ring 3, split
The shape of the click ring 4 is not limited . According to the joint of the present invention, the pipe end is sandwiched between the inner surface by the socket, the outer surface by the outer ring and the split lock ring, and the inner surface of the tube is engaged with the uneven surface of the socket. Therefore, the joint strength between the pipe and the joint is high, and the pipe does not come out even if a strong tensile force acts due to an earthquake or the like. Furthermore, since the split lock ring is tightened and fixed with the outer ring, the number of parts is small, handling is easy, and practically,
Extremely convenient.

[Brief description of the drawings] FIG. 1 is a cross-sectional view of a joint state of an embodiment of the joint of the present invention. FIG. 2 is a sectional view of the disassembled state. FIG. 3 is a sectional view showing the connecting operation in a stepwise manner. [Explanation of symbols] 1 Fitting 2 sockets 3 outer ring 40% lock ring 8 Stop bolt 21 Tsuba 22 Pipe joint 23 Uneven surface 24 annular groove 31 Enlarged part 32 slope 41 Uneven surface 42 slope 90 Pushing device

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16L 21/00-21/08 F16L 23/00-23/24 F16L 31/00-33/34 F16L 47 / 00-47/34

Claims (1)

(57) [Claims 1] A socket having a pipe connecting portion on both sides, an outer ring fitted to the outer surface of the pipe end, a split lock ring tightened by wedge action, and an outer ring Mounted on
It consists of a locking bolt and has an annular groove in the center of the socket.
The end of the stop bolt fits into this groove.
The outer ring has an enlarged diameter part on the inner side.
And the split lock ring fits into the inner surface of this enlarged diameter part,
The sockets are in contact with each other on the inclined surfaces, the outer surface of the socket is uneven, the tube end is sandwiched from both sides by the socket, the outer ring and the split lock ring, and the inner wall of the tube is eaten by the uneven surface of the socket. Fitting for soft synthetic resin pipes that will fit in.