JPH10176786A - Electrofusion joint with clamp member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply fix an electric fusion coupling at a thermoplastic resin pipe even without a complicated clamp jig while standing up to some degree of a shock and facilitating molding. SOLUTION: An electric fusion coupling with a clamping member comprises an electric fusion coupling member 1 which is fusion-joined with a thermoplastic resin pipe and in which a heating coil for thermal fusion is embedded; and clamp members fixed at the two side ends of the electric fusion member 1 and fixing the thermoplastic resin pipe. A fitting-in part is arranged at least one of the electric fusion coupling member 1 and the clamp member and a lock part 4 inserted in and locked at the fitting-in part is arranged at the other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electrofusion joint with a clamp member.

[0002]

2. Description of the Related Art Conventionally, polyethylene, polypropylene, and the like have been used for piping such as gas pipes, water pipes, sewer pipes, and hot water pipes.
Thermoplastic resin pipes such as polyvinyl chloride and polyvinylidene fluoride are used. In the piping work of these thermoplastic resin pipes, an electric fusion joint in which a heating wire is embedded in a joint for joining the thermoplastic resin pipes has been developed and widely used. In the fusion work of such an electric fusion joint,
In order to prevent the tube to be welded from coming out of the electric fusion joint, dedicated clamp jigs having different shapes corresponding to the electric fusion joint have been used.

[0003] By using the above clamp jig,
Although the joint and the tube to be fused can be securely joined, there are the following problems. 1) The clamp jig needs to be mounted until the cooling of the joint is completed (usually 5 to 10 minutes), and cannot be refilled immediately after the construction, which causes a waiting time for the construction. 2) To perform fusion continuously, various types of clamps are required. 3) When the construction work is performed near where the branch pipe joint is buried, the work becomes a hindrance to the work, and the branch pipe joint may come off the welded pipe by hitting an operator, a machine, or the like.

Therefore, a method of preventing the connected pipe from coming off by interposing a locking member in the gap between the inner peripheral surface of the joint receiving port and the outer peripheral surface of the end of the connected pipe (Japanese Patent Application Laid-Open No. 5-302694). A method of shrinking the inner diameter of a joint by tightening a taper screw and fixing the joint by clamping (Japanese Patent Laid-Open No. Hei 6-3001)
No. 77 gazette) and the like, and a joint and a clamping method that can be easily constructed have been proposed.

[0005]

However, in the above-mentioned joint, since the joint and the clamp jig are integrally formed or require screw processing, the shape of the molded product becomes complicated, and the molding is troublesome. Since clamping is performed with screws, the clamping force varies depending on the joint shape and the operator. There were drawbacks such as.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a clamp member which can be easily fixed to a thermoplastic resin tube without a complicated clamping jig, can withstand a slight impact, and can be easily formed. An object of the present invention is to provide an electric fusion joint.

[0007]

An electric fusion joint with a clamp member according to the present invention has a heat wire for thermal fusion embedded in a thermoplastic resin tube (hereinafter referred to as a "fused tube"). Electric fusion joint members (hereinafter simply referred to as "joint members")
And a clamp member fixed to both ends of the joint member and fixing the tube to be fused, and the electrofusion joint member has a fitting portion on at least one of the electrofusion joint member and the clamp member. The other is provided with a locking portion that is inserted and locked in the fitting portion.

[0008] The material of the joint member is not particularly limited as long as it can be thermally fused to the tube to be fused, and thermoplastic resins such as polyethylene, polypropylene, polyvinyl chloride, and polyvinylidene fluoride can be used. From the viewpoint of the adhesive strength at the time of fusion, a tube similar to the tube to be fused is preferable.

The material of the clamp member is not particularly limited, and a thermosetting resin, a metal, or the like can be used in addition to the thermoplastic resin, but the same material as the joint member is preferable.

[0010] The fitting portion and the locking portion provided on the joint member and the clamp member may be provided integrally with the coupling member and the clamp member by injection molding or the like, respectively, or the locking portion is separately joined and fitted. A joint may be provided. Further, the clamp member may be divided into two or more as necessary (particularly in the case of a saddle system).

In the case where the clamp member is made of a resin having high lubricity such as polyethylene, an O-ring may be mounted between the clamp member and the tube to be fused, if necessary.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.
This will be described in detail with reference to the drawings. FIG. 1 is a front view showing an example of the shape of a joint member (socket) of the joint with a clamp member of the present invention, and FIG. 2 is a side view thereof. Joint member 1
Is composed of a cylindrical joint body 2 fixed to the outer peripheral portion of the tube 8 to be fused (FIG. 4), a terminal 3 connected to a hot wire for heat fusion (not shown), and a locking portion 4. Except for, they are integrally molded.

FIG. 3 is a front view showing an example of the shape of a clamp member used for the joint member (socket) shown in FIGS. The clamp member 5 is integrally formed with a fusion tube mounting portion 6 for mounting and centering a fusion tube 8 (FIG. 4) and a cylindrical fitting portion 7 for fitting the locking portion 4. Is provided. The locking portion 4 is locked to the fitting portion 7 and includes a conical portion 4 a having a slightly larger bottom diameter than the fitting portion 7, and a cylindrical portion 4 b inserted into the fitting portion 7.

FIG. 4 is a side view showing a state in which the joint with a clamp member shown in FIGS.
In order to mount the joint with a clamp member of the present invention to the tube 8 to be fused, first, the joint member 1 is inserted into the tube 8 to be fused. Next, the clamp member 5 is attached to both ends of the joint member 1 and the fitting tube 7 is mounted on the fusion tube mounting portion 6 while the fusion tube 8 is being installed.
When the locking portion 4 is inserted and locked to the both ends of the joint member 1 and fixed to both ends of the joint member 1, a joint with a clamp member to which the tube 8 to be fused is attached is obtained.

FIG. 5 is a front view showing an example of the shape of a joint member (saddle) of the joint with a clamp member of the present invention, and FIG. 6 is a side view thereof. The joint member 11 is a cylindrical half-split joint body 12 that is fixed to the outer peripheral portion of the pipe to be fused 18 (FIG. 8).
And a branch pipe connecting part 121 for connecting the pipe to be fused to a branch pipe (not shown), a terminal 13 for connecting to a hot wire for heat fusion (not shown), and a locking part 14.

FIG. 7 is a front view showing an example of the shape of a clamp member used for the joint member (saddle) shown in FIGS. The clamping members are half-shaped members 151 and 152.
When the members 151 and 152 are opposed to each other, the fitting portion 16 is fitted to the outer peripheral portion of the fused tube 18 (FIG. 8) and is centered, and the engaging portion 14 is fitted. A joint 17 is provided.

FIG. 8 is a side view showing a state in which the joint with a clamp member shown in FIGS.
In order to mount the joint with a clamp member of the present invention to the tube to be fused 18, first, the joint member 11 is fitted to the tube to be fused 18. Next, the clamp members 151 and 152 are connected to the joint member 11.
On both sides of the joint member 11, the locking portion 14 is inserted and locked in the fitting portion 17 while the tube to be welded 18 is installed in the portion to be fused 16 and is fixed to both ends of the joint member 11. A joint with a clamp member to which the fitting tube 18 is attached is obtained.

[0018]

As described above, the electric fusion joint with a clamp member of the present invention can be easily fixed to a connected pipe without a clamp jig, and immediately after the joint member is fused. It can be backfilled and requires fewer parts. Further, the electrofusion joint with the clamp member of the present invention can withstand some impact and can be easily formed.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of the shape of a joint member (socket) of a joint with a clamp member of the present invention.

FIG. 2 is a side view of the joint member (socket) shown in FIG.

FIG. 3 is a front view showing an example of a shape of a clamp member used for the joint member (socket) shown in FIGS.

FIG. 4 is a side view showing an example of a state in which the joint with a clamp member shown in FIGS.

FIG. 5 is a front view showing an example of the shape of a joint member (saddle) of the joint with a clamp member of the present invention.

FIG. 6 is a side view of the joint member (saddle) shown in FIG. 5;

FIG. 7 is a front view showing an example of a shape of a clamp member used for the joint member (saddle) shown in FIGS.

8 is a side view showing an example of a state in which the joint with a clamp member shown in FIGS.

[Explanation of symbols]

 1, 11 Joint member (electrofusion joint member) 2, 12 Joint body 4, 14 Locking part 5, 15 Clamp member 7, 17 Fitting part 8, 18 Fused tube

Claims (1)

[Claims] 1. An electro-fusion joint member in which a heat wire for heat fusion to be fusion-bonded with a thermoplastic resin tube is embedded, and fixed on both side ends of the electro-fusion joint member to fix the thermoplastic resin tube. A clamping member, wherein the electrofusion joint member has a fitting portion provided on at least one of the electrofusion joint member and the clamp member, and the other has a locking portion inserted and locked in the fitting portion. An electrofusion joint with a clamp member, characterized in that: