JPH0428738Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention, when welding a saddle to a synthetic resin tube, fixes the tube so that the fusion surface of the tube against which the heater face is pressed matches the heater face. Concerning pipe clamps for correction.

Prior Art When melting the welding surface of a tube with a heater when welding a saddle, the diameter of the welding surface must match the diameter of the heater face. However, since the tube is made of synthetic resin, there are large manufacturing tolerances for the tube diameter, and it is often crushed or deformed into an oval shape, making it difficult for the heater face to fully contact the fusion surface. Poor fusion may occur. For this reason, conventionally, the fusion surface of the tube is held with a straightening clamp before fusion, and the diameter of the fusion surface is corrected to match the diameter of the heater face. Since it became a hindrance, it had to be removed, and the corrected part returned to its original shape, making it difficult to achieve a sufficient correction effect.

Problems to be Solved by the Invention This invention aims to solve the above-mentioned problems, and for this purpose, it is possible to maintain straightness by clamping the tube even during fusion by the heater face.

Means for Solving the Problems According to the present invention, a pipe clamp for straightening a pipe is provided with a window that exposes the welding surface, and the heater face is pressed against the welding surface through the window.

Here, the window is formed by drilling into the pipe clamp or is framed by a window frame fixed to the pipe clamp.
In any case, it is preferably formed to a minimum size that does not cause any trouble in pressing the heater face and further welding the saddle, and its edges press the periphery of the welding surface.

The pipe clamp may be detachably provided separately from the clamp mechanism of the saddle fusion machine, or may be incorporated and integrated with the clamp mechanism of the saddle fusion machine.

It is desirable that the pipe be straightened by the pipe clamp until the saddle is fused, but if necessary it is continued until the melting by the heater face is completed.

Embodiment The embodiment shown in Figures 1 and 2 shows an example in which a pipe clamp is integrated into the clamp mechanism of a saddle fusion machine, and the pipe clamp 1 is divided into two parts, and one side of the pipe clamp 1 is divided into two parts. 1a is fixed to one end of the slide shaft 2, and the other side piece 1b is rotatably connected to the one side piece 1a at the lower end by a link 3.
is opened and closed so that the tube 4 can be removably inserted from the side.A fork 5 that is pivoted on the upper end of one side is pushed down, and a tightening screw 6 that is screwed into the fork is screwed on the other side. By screwing the fitting into 1b, the tube 4 can be held and fixed by both side pieces 1a and 1b. A rectangular window 7 is also formed in one side piece 1a of the pipe clamp 1, and a heater face 9 suspended between the saddle holder 8 and the saddle holder 8 is pressed against the pipe 4 through the window 7. As is known, the saddle holder 8 has a saddle 11 removably attached to the side facing the heater face 9, and is moved forward and backward toward the heater face 9 by operating the handle 12, and when moving forward, the saddle 11 is removably attached to the side facing the heater face 9. The action of pushing the face 9 and pressing it against the tube 4 is performed.

The embodiment shown in FIG. 3 shows an example in which the pipe clamp is provided separately from the clamping mechanism of the saddle fusion machine, in which the pipe clamp 15 is connected to the pipe between the clamps 16 and 4.
In the same manner as in the above embodiment, it can be detachably attached. The pipe clamp 15 may have both sides connected at the lower end by a link as in the above embodiment, or as shown in FIG. The connection may be made by being hooked to the pin 18 of. In the latter case, the two pieces are separated when removed from the tube.

Effects of the invention According to the pipe clamp of the present invention, the straightening action of the pipe works effectively during melting and, if necessary, even during welding of the saddle, and it is possible to eliminate the occurrence of defective welding.

[Brief explanation of drawings]

Fig. 1 is a partial cross-sectional front view of the main parts of the saddle fusion machine, Fig. 2 is a side view of the pipe clamp, Fig. 3 is a side view of another embodiment, and Fig. 4 is a partial cross-section of a modified version. Show the diagram. 1,15...Pipe clamp, 4...Pipe, 7...
...window, 8...saddle holder, 9...heater face.

Claims (1)

[Claims for Utility Model Registration] (1) A pipe clamp for straightening pipes used in a saddle fusion machine is provided with a window through which the fusion surface of the pipe is exposed, and the heater face is pressed against the pipe through the window. Pipe clamp (2) The pipe clamp is incorporated and integrated into the clamping mechanism of the saddle fusion machine.
(3) The pipe clamp according to claim 1, wherein the pipe clamp is detachably attached to the pipe separately from the clamping mechanism of the saddle fusion machine.