JP3347196B2 - Clamping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp device used when a saddle of a branch pipe joint is bonded or fused to an outer peripheral surface of a synthetic resin pipe.

[0002]

2. Description of the Related Art Generally, when a saddle of a branch pipe joint is bonded or fusion-bonded to the outer peripheral surface of a synthetic resin pipe, a predetermined time is required until joining is completed while the curved surface of the saddle is pressed against the outer peripheral surface of the synthetic resin pipe. Need to be retained. Therefore, as conventionally proposed in Japanese Patent Publication No. Hei 5-59315,
The upper and lower surfaces of the synthetic resin pipe are sandwiched between the saddle of the branch pipe joint and the stirrup member, and one end of the stirrup member is engaged with one flange of the saddle, and the other end of the stirrup member is connected to the saddle. A clamp device has been used to fasten and fix the other flange with a cam member.

[0003]

However, as in this clamp device, one end of the stirrup member is engaged with one flange of the saddle, and the other end of the stirrup member and the other flange of the saddle are engaged. When these are fastened and fixed by a cam member, the outer peripheral surface of the synthetic resin pipe and the saddle curved surface of the branch pipe joint may come into contact with each other, so that strong adhesion or fusion bonding may not be obtained.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and a strong adhesion or fusion bonding is obtained by pressing an outer peripheral surface of a synthetic resin pipe and a saddle curved surface of a branch pipe joint with a uniform pressing force. The present invention provides a clamping device that can be used.

[0005]

According to the present invention, a pair of locking members are rotatably supported at both ends of a supporting member, and a flange of the saddle is provided inside the distal end of each locking member. A hook is provided for engaging the portion. On the other hand, a shaft rod is inserted into an intermediate position of the support, a pressing plate is provided at the distal end thereof so as to be in contact with the outer peripheral surface of the synthetic resin pipe, and a cam member provided with an operating rod substantially at the center of the support is provided by a shaft. Support. Then, when the cam member is rotated by the operation stick, the cam member presses the back surface of the pressing plate.

[0006]

With the above construction, when the cam member is rotated by the operating rod to press the back surface of the pressing plate, the outer peripheral surface of the synthetic resin pipe and the saddle curved surface of the branch pipe joint come into pressure contact with uniform pressing force. .

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a front view of a clamp device showing one embodiment of the present invention, FIG. 2 is a partially cut-away side view, and FIG. 3 is a schematic diagram for explaining a support state of a support and a locking body. Reference numeral 1 denotes a branch pipe joint made of a synthetic resin such as polyethylene. A saddle 21 having a curved surface equal to the outer peripheral surface of the synthetic resin pipe 1 is provided at one end of the branch pipe joint 2, and a heating wire is embedded in the curved surface of the saddle 21. A is a clamp device used when joining the synthetic resin pipe 1 and the branch pipe joint 2.

The clamp device A has a structure in which a pair of locking members 4 are rotatably supported at both ends of a support 3.
That is, a rectangular shaft 42 provided at the base of the locking body 4 is mounted on the shaft hole 31 provided on the support 3, and the shaft 42 is provided above the shaft hole 31 as shown in FIG. The locking body 4 does not fall down in a state where the locking body 4 is fitted in the long hole 311. Then, when the locking member 4 moves downward and the shaft rod 42 descends to the round hole 312, the locking member 4 can be rotated as indicated by an arrow in the drawing. Reference numeral 310 denotes a stopper step for restricting the rotation of the locking member 4.

A hook 41 is provided on the inside of the distal end of the pair of locks 4. When the locks 4, 4 are raised, the hooks 41 are attached to the flange 210 of the saddle 21. Can be engaged.

On the other hand, shaft rods 5 and 5 are inserted through two intermediate positions of the support body 3, and the leading end of each of the shaft rods 5 has a pressing plate 51 abutting on the outer peripheral surface of the synthetic resin pipe 1. Is provided. A coil spring 52 is mounted between the other end of the shaft 5 and the support 3, and the elastic force of the coil spring 52 urges the pressing plate 51 to retract. In addition, the center of the support 3, that is, the shaft rod 5,
A cam member 6 is pivotally supported between the respective pressing plates 51, 51, and an operation stick 61 is connected to the cam member 6. When the operating member 61 is grasped and the cam member 6 is rotated, the cam member 6 presses the rear surfaces of the pressing plates 51, 51.

Next, a procedure for joining the branch pipe joint 2 to the synthetic resin pipe 1 using the clamp device A will be described. First, as shown in FIG.
Is placed, and the clamp device A is set from below the synthetic resin tube 1. At this time, the locking body 4 moves downward and the shaft 4
Since 2 is located in the round hole 312 of the shaft hole 31, the locking body 4 can be rotated with respect to the support 3.

[0012] Then, the respective locking members 4 and 4 are erected to engage the hooking piece 41 with the flange 210 of the saddle 21. At this time, since the pressing plate 51 provided at the distal end of the shaft 5 is retracted by the elastic force of the coil spring 52, it does not contact the outer peripheral surface of the synthetic resin tube 1. Therefore, operation stick 6
After grasping 1, the cam member 6 is rotated, and the cam member 6 is pressed against the back surfaces of the respective pressing plates 51, 51. Then, the respective pressing plates 51, 51 are pressed against the outer peripheral surface of the synthetic resin tube 1, whereby the curved surface of the saddle 21 is pressed against the outer peripheral surface of the synthetic resin tube 1 with a uniform pressing force.

After the saddle 21 of the branch pipe joint 2 is pressed against the outer peripheral surface of the synthetic resin pipe 1 as described above, the heating wire embedded in the curved surface of the saddle 21 is heated to generate heat. The outer peripheral surface and the curved surface of the saddle 21 are fusion-bonded. After the joining operation is completed, the cam member 6 is rotated in the reverse direction to separate from the rear surfaces of the pressing plates 51, 51, the support 3 is slightly lifted, and the locking members 4, 4 are tilted left and right. Remove the clamp device A.

The clamp device of the present invention can also be used for connecting a branch pipe joint in which a heating wire is not embedded in the curved surface of the saddle. For example, it can be used when the outer peripheral surface of the synthetic resin pipe and the saddle curved surface of the branch pipe joint are simultaneously melted with an electric heating iron and then fusion-bonded, and the outer peripheral surface of the synthetic resin pipe and the saddle curved surface of the branch pipe joint can be used. It can also be used in the case of adhesive bonding with an adhesive interposed between them.

[0015]

As described above in detail, the use of the clamp device of the present invention allows the outer peripheral surface of the synthetic resin pipe and the saddle curved surface of the branch pipe joint to be pressed against each other with a uniform pressing force without causing any contact. Therefore, the synthetic resin pipe and the branch pipe joint can be securely and firmly bonded or fusion-bonded.

[Brief description of the drawings]

FIG. 1 is a front view of a clamp device showing one embodiment of the present invention.

FIG. 2 is a partially cut-away side view of the clamp device shown in FIG.

FIG. 3 is a schematic diagram for explaining a state in which a supporting body and a locking body are pivotally supported.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Synthetic resin pipe 2 Branch pipe joint 3 Support 4 Locking body 5 Shaft 6 Cam member A Clamp device

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 65/00-65/82 F16L 41/06

Claims (1)

(57) [Claims] 1. A clamping device used when a saddle (21) of a branch pipe joint (2) is pressed into contact with an outer peripheral surface of a synthetic resin pipe (1) for bonding or fusion bonding. A pair of locking members (4) are rotatably supported on both end sides of (3), and are engaged with the flanges (210) of the saddle (21) at the inner ends of the respective locking members (4). Hanging piece (4
1), a shaft plate (5) is inserted at an intermediate position of the support (3), and a pressing plate (51) is provided at the tip thereof to abut the outer peripheral surface of the synthetic resin pipe (1). Support (3)
Member (6) provided with an operation stick (61) almost in the center of the
The cam member (6) presses the back surface of the pressing plate (51) when the cam member (6) is rotated by the operation stick (61). .