JPH0754160B2 - Saddle joint fixing device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a fixing device for a saddle joint.

(Prior Art) Conventionally, when connecting a pipe molded of a thermoplastic resin such as polyethylene, a heating element such as a resistance wire was embedded in the joint surface of the joint with the pipe, and the pipe was inserted and connected to this joint. A technique is known in which the resin is melted by appropriately heating the heating element in this state, and the pipes are joined via a joint.

On the other hand, to connect a branch pipe to a pipe, the pipe is provided with a connection port with the branch pipe, a saddle joint is fitted to the pipe so as to match the connection port, and the above-mentioned fusion bonding or saddle joint is performed. After fusing the joint, a connection port is provided in the pipe by a cutter mounted in the saddle joint. By the way, in order to fusion-bond the saddle joint to the pipe, the saddle joint is pressed against the pipe so that the inner peripheral arc surface of the saddle joint is evenly adhered to the outer peripheral surface of the pipe, and the joint is completely joined to the pipe. Until the strength is generated, it is necessary to firmly hold it against the deformation caused by thermal strain.

Under these circumstances, a saddle joint fixing device as disclosed in Japanese Patent Laid-Open No. 61-184295 has been proposed. That is, this fixing device is a stirrup device having a pressing and receiving device that is arranged so as to engage with the pipe at a position facing the attachment component and that engages with the attachment component near one side edge of the attachment component, The clamp mechanism is attached to the stirrup device and can engage with the attachment part near the other side edge of the attachment part.

(Problem to be Solved by the Invention) However, in the above-described fixing device for the saddle joint, the pipe is deformed due to the influence of the storage state, the temperature, etc. due to the fact that both side flanges of the saddle joint are pulled and pressed against the pipe. In this case, the inner peripheral arc surface of the saddle joint may only partially contact the outer peripheral surface of the pipe, and a gap may occur between the two. When the fusion bonding is performed in such a state, there is a problem that the molten resin moves to the above-mentioned gap and the predetermined strength is not obtained. Further, there is a problem in that the resistance wire moves and short-circuits as the resin moves, causing abnormal heat generation and preventing normal fusion.

Moreover, pulling the flanges on both sides of the saddle joint causes a reaction force that resists bending due to the rigidity of the saddle joint.Therefore, in order to make the inner circular arc surface of the saddle joint uniformly adhere to the outer peripheral surface of the pipe, apply a large pressure. Power is needed.
However, considering that such joining work is performed in a narrow space, for example, inside a groove excavated to a predetermined depth on a road, there is a problem in workability.

The present invention has been made in view of the above points, and provides a fixing device for a saddle joint that can easily and evenly adhere the saddle joint to a pipe.

(Means for Solving the Problem) According to the present invention, a base body on which a pipe mounting portion is formed, an elevating body that can be fixed at an appropriate height with respect to the base body, and an elevating rod including an operation handle are used. The saddle holder is fixed to the elevating body so as to be able to move up and down, and a pair of pressing portions arranged on the left and right of the saddle holder and urged via springs between the saddle holder. By lowering the saddle holder, both flanges and branches of the saddle joint fitted to the pipe can be pressed by the pressing portion and the saddle holder, respectively.

(Operation) First, the base body is fitted into the lifting body, and the lifting body and the base body are fixed at a height position set corresponding to the outer diameter of the pipe.

On the other hand, a saddle joint is fitted at a predetermined position of the pipe, and the pipe is arranged on a mounting portion of a base body formed so as to match the outer diameter of the pipe.

Then, after moving the pair of pressing portions so as to face both flanges of the saddle joint, the pressing portions are moved up and down to adjust the spring force to the flange of the saddle joint. Next, when the operation handle is operated to lower the saddle holder, the pressing portion comes into contact with both flanges of the saddle joint and starts pressing. Further, if the operating handle is still operated, the pressing portion presses both flanges of the saddle joint by the biasing force of the spring until the saddle holder descends and presses the branch of the saddle joint.

In this way, when the branch and the flange of the saddle joint are pressed by the saddle holder and the pressing portion to generate a certain reaction force, the torque limiter of the operation handle operates to stop the descent of the saddle holder. .

After that, when the heating element embedded in the saddle joint is heated, the resin is melted, and the saddle joint can be fusion-bonded to the pipe. When the joining work is completed, the operation handle is rotated in the opposite direction to disengage the saddle holder and the pressing portion from the branch and the flange, respectively.
After that, a connection port is provided in the pipe by a cutter installed in the saddle joint.

A connection port may be opened in the pipe before fitting the saddle joint to the pipe.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a fixing device. The fixing device 1 is composed of a support frame 2 formed in a U-shape, and a pressing frame 3 provided so as to be capable of moving up and down with respect to the support frame 2.

The support frame 2 is composed of an L-shaped base 5 on which a mounting portion 4 of the pipe P is formed, and an inverted L-shaped lifting body 6 fitted and inserted in the base 5, as shown in FIG. When the base body 5 is fixed to the elevating body 6, a U-shape is formed. The vertical portion 5a of the base 5 is provided with a plurality of small holes at appropriate intervals, while the vertical portion 6a of the lifting body 6 is provided.
Also has a single small hole. Therefore, the base 5
Both can be fixed by inserting the fixing pin 7 between an arbitrary small hole provided in the and the small hole provided in the lifting body 6. In this case, the positions of the plurality of small holes provided in the base 5 are uniquely determined by the outer diameter of the pipe P. That is, the small hole through which the fixing pin 7 is inserted is different when a pipe having a certain outer diameter is placed and when a pipe having an outer diameter different from that is placed, and as a result, the horizontal portion 5b of the base 5 and the vertical portion 5b are lifted. The height between the horizontal portions 6b of the body 6 has a peculiar value corresponding to the outer diameter of the pipe P.

Note that, contrary to the above, a plurality of small holes may be provided in the lifting body 6 and a single small hole may be provided in the base body 5.

Further, a liner R can be arranged on the mounting portion 4 formed on the horizontal portion 5b of the base body 5 so as to correspond to the outer diameter of the pipe P. By replacing and arranging R, it becomes possible to mount various types of pipes P having different outer diameters without changing the base body 5.

Further, a female screw hole is formed at a suitable position of the horizontal portion 6b of the elevating body 6 with a vertical line passing through the center of curvature of the placing portion 4 as a center line. The female screw hole has a pressing frame 3 described later.
An elevating rod 8 for elevating the saddle holder 10 is screwed.

The pressing frame 3 is composed of a saddle holder 10 which can be raised and lowered by an elevating rod 8 with respect to the above-mentioned elevating body 6, and a pressing body 13 which is pressed and urged between the saddle holder 10.

The saddle holder 10 is provided with an elevating rod 8 so as to be able to ascend and descend with respect to the elevating body 6, and as shown in FIG. 1, a fixed nut fixed to a shaft portion 8a of the elevating rod 8.
8c and the head 8b of the elevating rod 8 hold the saddle holder 10 gently so that it can rotate freely.
It is fixed rotatably with respect to.

Further, an operating handle 9 is integrally fixed to the shaft portion 8a of the elevating rod 8, and the elevating rod 8, that is, the saddle holder 10 is moved up and down with respect to the elevating body 6 by rotating the operating handle 9. Can be raised and lowered.

The operation handle 9 is not shown in detail,
It has a built-in torque limiter so that it will idle when a torque above a certain level is applied.

By the way, the saddle holder 10 integrally includes horizontal bars 11, 11 extending in the left-right direction, and the left and right horizontal bars 11, 11 form a slit 12 in the longitudinal direction. The slit 12 is fitted with pressing bodies 13, 13 which are slidable along the slit 12.

The pressing body 13 includes a pressing portion 14 for pressing the flange Tf of the saddle joint T fitted to the pipe P, a spring 15 arranged between the pressing portion 14 and the horizontal bar 11, and the slit.
The wing nut 16 is screwed into the rod of the pressing portion 14 inserted into the 12 and adjusts the distance between the horizontal bar 11 and the pressing portion 14.

On the other hand, the saddle holder 10 is a branch of the saddle joint T.
It presses Tb, and the saddle holder 10 moves up and down the rod 8.
The branch Tb of the saddle joint T is pressed by the head 8b of the elevating rod 8 by descending in conjunction with the descending of the.

Next, the operation of this embodiment will be described with reference to FIG.

First, a liner R having an inner diameter corresponding to the outer diameter of the pipe P is prepared, and the liner R is arranged on the mounting portion 4 of the base 5. Then, the base body 5 is fitted into the elevating body 6 and the fixing pin 7 is inserted between the base body 5 and the small hole corresponding to the outer diameter of the pipe P to appropriately fix the both. In this state, after fitting the saddle joint T to the pipe P at a predetermined position on the pipe P, the pipe P is arranged on the liner R arranged on the mounting portion 4 of the base 5.

Then, the pressing body 13 is slid left and right with respect to the horizontal bar 11 so that the pressing portion 14 can press the flange Tf of the saddle joint T, and at the same time, the distance between the horizontal bar 11 and the pressing portion 14 is set to the pipe P. Wing nut until reaching the distance set by the outer diameter of
Rotate 16 That is, the spring force is adjusted to a desired value in accordance with the sliding saddle joint T. After this,
When the operating handle 9 is rotated after setting the torque of the operating handle 9 to a constant value, the saddle holder 10 and the pressing body 13 interlocking with the saddle holder 10 descend.

At this time, although not shown in detail, the branch Tb of the saddle joint T and the saddle holder 10 are fixed so that a desired pressing force can be generated corresponding to the size of the saddle joint T, that is, the outer diameter of the pipe P. Set the distance between the heads 8b of the lifting rod 8 to 1
Saddle holder 10 with one or more spacers
Or adjust the urging force of the spring 15 by disposing one or more spacers between the flange Tf of the saddle joint T and the pressing portion 14. The number of the spacers is set in advance corresponding to the outer diameter of the pipe P.

When the saddle holder 10 is lowered to a predetermined position by the turning operation of the operation handle 9, the pressing portion 14 presses the flange Tf of the saddle joint T with a constant urging force, and at the same time, the head 8b of the lifting rod 8 moves to the saddle joint T. As a result of pressing the branch Tb with a predetermined force, the turning torque becomes too large and the torque limiter (not shown) is activated, so that the operation handle 9 idles with respect to the elevating rod 8.

Thereafter, if a power supply voltage is supplied for a predetermined time through a terminal (not shown) provided on the saddle joint T, the saddle joint T
The heating element embedded in the fitting portion of the pipe P of
Since the saddle joint T is melted, the saddle joint T can be fusion-bonded to the pipe P. When fusion is completed and the joint is solidified and the joint strength appears, remove the fixing device,
The connection port is provided on the pipe by the cutter installed in the saddle joint.

In the present embodiment, the joint is heated by using electric energy and the fusion-bonding is shown, but other joining, for example, a metal piece is embedded in the joint surface with the pipe of the saddle joint, and ultrasonic waves are applied. Alternatively, it can be heated using electromagnetic waves.

Further, the fixing device of the present invention can be used to hold the state until the pipe and the saddle joint are adhesively joined with an adhesive and the adhesive strength is obtained.

As described above, according to the present invention, when the saddle joint is joined to the pipe, the pressing portions are opposed to both flanges of the saddle joint to adjust the pressing force, and the operation handle lowers the saddle holder. Since the branch and both flanges of the saddle joint can be pressed by a simple operation, it is possible to apply a pressing force to the saddle joint so as to make close contact with the outer peripheral surface of the pipe, ensuring reliable joining work. It can be carried out.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings illustrate an embodiment of a fixing device for a saddle joint according to the present invention. FIG. 1 is an overall front view thereof, FIG. 2 is a side view thereof, and FIG. 3 is a pipe and saddle. It is explanatory drawing in the case of fitting a joint and performing a joining operation. 2 ... Support frame, 3 ... Pressing frame 5 ... Base, 6 ... Lifting body 10 ... Saddle holder, 13 ... Pressing body

Claims (1)

[Claims] 1. A base body on which a pipe mounting portion is formed, an elevating body that can be fixed at an appropriate height with respect to the base body, and an elevating rod provided with an operating handle so as to be able to move up and down with respect to the elevating body. It is composed of a fixed saddle holder and a pair of pressing portions which are arranged on the left and right of the saddle holder and are urged via a spring between the saddle holder, and by lowering the saddle holder via the operation handle, the pipe A saddle joint fixing device, characterized in that both flanges and branches of the saddle joint fitted to the above are configured to be able to be respectively pressed by the pressing portion and the saddle holder.