JPS6227394Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a saddle welding machine that can perform saddle welding efficiently, and particularly to improvements to its pipe clamp portion.

Pipe made of synthetic resin such as polyethylene is often used as a city gas conduit. When laying synthetic resin pipes, it is necessary to fuse the saddles to the pipes in order to connect branch pipes, etc. To do this, the fused surfaces of the pipe and saddle are heated and melted, and each fused surface is The saddle is pressed together and then cooled for a certain period of time to fuse the saddle to the pipe.
A conventional fusion splicer that performs such fusion bonding mainly consists of a clamp that grips the pipe and a holder that holds and presses the saddle against the pipe, but the clamp that grips the pipe is divided on a vertical plane. and has a movable clamp and a fixed clamp pivotally connected by a hinge at the lower part. Therefore, when performing fusion in a narrow space, such as when digging a hole at a construction site, with the clamp open, press the fixed clamp against the side of the horizontally extending buried pipe, and place your hand under the pipe. The movable clamp had to be pushed through the lower side of the horizontal pipe, and then it had to be lifted up to the vertical dividing plane, and then the movable clamp and the fixed clamp had to be closed-fastened at the upper part. However, such work is inconvenient and extremely troublesome to perform in a narrow space, and requires a great deal of labor and time, and there has been a demand for improvement measures.

In order to satisfy these demands, the present invention aims to provide a saddle welding machine with excellent workability, which can be easily attached to and removed from pipes even in narrow spaces, and which enables efficient saddle welding.

A preferred embodiment of the present invention will be described below with reference to the drawings.

The saddle fusion machine basically consists of pipe clamp part 1.
0 and a saddle holder part 50. The pipe clamping section 10 has a movable clamp 11 and a fixed clamp 13 which are substantially divided into two by a vertical plane H. The fixing clamp 13 has support legs 15, which together with support legs 57 of a saddle holder section 50 (to be described later) serve to horizontally place the saddle fusion machine, for example, on the bottom surface G of an excavated hole. On the other hand, the movable clamp 11 is also provided with a spare support leg 17, which serves as a support leg when the fusion splicer is used in an upright position.

The fixed and movable clamps 13 and 11 extend in the axial direction of the pipe P, and each grips a half of the outer circumference of the pipe P over a width W (FIG. 2). The fixed clamp 13 and the movable clamp 11 are connected at fork members 25 and 27 formed at both upper ends thereof by a tightening member 19 in the shape of, for example, a round bar or a square bar. The end of the tightening member 19 is formed as a threaded rod 19A, and a clamp knob 2 with a threaded hole is attached to this threaded rod 19A.
1 are screwed together. The tip of the square rod 19 is rotatably supported by a pivot pin 29 attached to a fork member 27 of the movable clamp 11. The square bar 19 is prevented from coming off upward by a pin 23 attached to the fork member 25 of the fixed clamp 13. When the clamp knob 21 is thus rotated, the fixed clamp 13 and the movable clamp 11 are moved slightly closer to and further away from each other. The movable clamp 11 is rotatable around the pivot pin 29.

According to the present invention, hook arms 35 are pivotally attached to both ends of the lower portion of the movable clamp 11 via pivot pins 33. On the other hand, pins 37 are fixedly provided at both ends of the corresponding lower portion of the fixed clamp 13, with which the tip hooks 35A of the hook arms 35 engage. A long hole 41 is formed at the other end of the hook arm 35, and an operating lever 4 is inserted into this long hole 41.
3 horizontal rods 39 are loosely fitted. The operating lever 43 is vertically movably supported within a support portion 12 formed integrally with the movable clamp 11, and is supported by a spring 4.
5 (FIG. 4), it is constantly pressed downward.
The operating lever 43 extends upward, and an L-shaped handle (operating lever) 49 is formed on its upper end, as shown in FIG. 3, for example, and is tilted sideways so that the operator can easily grasp it from above. Since a counterclockwise force is always applied to the hook arm 35 by the spring 45 in FIG.

A clamp 30 for correcting the bending of the pipe P is provided between the tightening members 19 of the fixed clamp 13. The clamp 30 can grip the outer periphery of the pipe P through a window 22 formed in the center of the fixed clamp 13. This clamp 30 is for correcting the bend in the pipe P, and once the clamp knob 21
After temporarily tightening the pipe P at two points, the clamp knob 48 is turned to firmly tighten the center of the pipe P with the clamp 30 to correct the bend. then clamp 3
0 firmly tighten both ends of the clamp knobs 21.
By strongly tightening the pipe P, the pipe P is firmly held by both clamp knobs 21 in a straightly extending state. After that, the clamp 30 may be removed.

The structure of the clamp 30 is not directly related to the present invention and will therefore be omitted.

A lever 4 with a handle 4A for rotating the movable clamp 11 relative to the fixed clamp is attached to the movable clamp 11 via a pin 6. Furthermore, a protrusion 42 for attaching a heater 100, which will be described later, is planted on the support post 44 of the fixed clamp.

A pair of parallel guide rods 51 extending perpendicularly to the pipe axis are fixed to the fixed clamp 13 of the clamp section 10, and the saddle holder section 50 has a slide block (main body) 53 slidably attached to the guide rods 51.
This makes it possible to approach and move away from the clamp section 10. The slide block 53 has a V-shaped arm 55 extending obliquely upward.
A projection 59 for the heater 100 is implanted at the tip of the heater 100 . The projections 59 are horizontally aligned with the corresponding projections 42 of the clamp portion 10, and these projections can suspend and hold the heater 100 in a predetermined position during heating and melting. Further, the end of the guide rod 51 is connected to the support leg 5.
Supported by 7. The support legs 57 together with the support legs 15 of the pipe clamp section 10 serve as a base when the fusion splicer is placed horizontally (FIG. 1). Slide block 5
The internal structure of No. 3 is also omitted because it is not directly related to the present invention. The slide block 53 has a saddle holder 95 fixed thereto, and a saddle S of a predetermined shape to which the pipe P is to be fused is fitted and held in the saddle holder 95. The saddle S is fixed in the holder by a knobbed fixing screw 99.

The saddle is fused to the pipe as follows.

First, attachment of the pipe clamp section 10 to the pipe P will be explained. The clamp knobs 21 at both ends of the pipe clamp section 10 are loosened in advance, and the hook 35A is removed from the pin 37. Also, the bend correction clamp 30 is removed. The movable clamp 11 is opened in half at the lower part of the fixed clamp 13, and both clamps 11 and 13 are held around the pipe P. Next, by holding the handle 4A and pushing down the movable clamp 11 using the lever 4 so as to close both clamps 11 and 13, the hook 35A is engaged with the pin 37 of the fixed clamp 13. This is because the hook arm 35 is always urged toward the engaged position by the spring 45. A feature of the present invention is that the hook 35A can be brought to the locked position with a single touch. Once both clamps 11 and 13 are attached so as to hold the pipe P, the clamp knobs 21 at both ends are then rotated to tighten the clamps. The tightening at this time is temporary tightening, so it is important not to tighten it too hard. Next, the correction clamp 30 is attached to the pipe P and the clamp knob 48 is strongly tightened to correct the bend in the pipe P, but a description of the bend correction action will be omitted. After the clamp knob 48 has been tightened, the clamp knobs 21 at both ends, which have been temporarily tightened, are strongly tightened to complete the final tightening. After the final tightening of the clamp knobs 21 at both ends is completed, the clamp knobs 48 are loosened and the bend correction clamp 30 is removed. That is, the role of the clamp 30 has ended.

Next, before welding the saddle S to the pipe P, it is necessary to melt the welding surfaces of both. Therefore, the concave groove 101 corresponding to the outer circumference of the pipe P and the concave surface of the saddle S
Heater block 10 having a convex surface 102 corresponding to S' (having a shape corresponding to the outer circumference of pipe P)
0 is applied so as to bridge the protrusion 42 of the pipe clamp part 10 and the protrusion 59 of the saddle holder part 50 (the heater block 100 is formed with a long groove 103 into which the protrusions 42 and 59 fit). At this time, the saddle holder part 50 is kept close to the pipe clamp part 10 to the extent that the heater block 100 can fit between the saddle holder part 50 and the heater clamp part 10. Moreover, the saddle S is already attached to the saddle holder 95. Next, the slider block 53 is slid toward the pipe clamp section 10 to bring the heater block 100 into contact with the pipe P and saddle S. The concave surface 101 of the heater block 100 is brought into contact with the outer periphery of the pipe P through the window 22 of the fixed clamp 13. Strongly press the pipe P and saddle S against the heater block 100, and
The joint surfaces of the pipe P and the saddle S are heated and melted. When heating for a predetermined period of time is completed, the slider block 53 of the saddle holder section 50 can be moved away from the pipe clamp section 10 in order to remove the heater block 100.

After removing the heater block 100, the slider block 53 of the saddle holder section 50 is brought close to the pipe clamp section 10 along the guide rod 51 again, and the saddle S is brought into contact with the pipe P. Then, when the lever 81 is pulled up again to the upright position, the saddle S is pressed against the pipe P with the required force, and soon the saddle S is completely fused to the pipe P as the joint surface is cooled.

When the pipe clamp part 10 is removed from the pipe P after the work is completed, it is sufficient to loosen the clamp knobs 21 at both ends and pull up the lever 43 against the spring 45 using the handle 49. That is, according to the present invention, the pipe clamp 10 can be removed with a single touch using one hand.

It goes without saying that the welding machine of the present invention can also be applied to the case where the saddle S is welded from vertically above the pipe P by placing the support leg 17 in a vertical position.

As described above, according to the present invention, the pipe clamp part 10 of the saddle fusion machine is particularly improved, and the pipe clamp part 10 can be attached to and removed from the pipe without pushing the hand under the pipe. This can be done simply and easily using the operating lever located above.
Therefore, it is particularly advantageous for performing fusion work in narrow spaces.

[Brief explanation of the drawing]

Figure 1 is a front view showing the overall configuration of the saddle fusion machine according to the present invention, Figure 2 is a plan view of Figure 1, Figure 3 is a left side view of Figure 1, and Figure 4 is Figure 2. - line sectional view of. DESCRIPTION OF SYMBOLS 10... Pipe clamp part, 11... Movable clamp part, 13... Fixed clamp part, 19... Tightening member, 21... Clamp knob, 35... Hook arm, 43, 49... Operation lever, 45... …spring,
P...pipe, S...saddle.

Claims (1)

[Scope of utility model registration request] The pipe to which the saddle is to be fused is gripped by a clamp device that can be expanded in half, and the saddle to be fused, which is held by a holder, is pressed onto this pipe from the radial direction of the pipe to join the fusion surfaces of the pipe and the saddle. In the saddle fusion machine, the clamping device has a pair of movable and fixed clamps each forming a clamp half, and the upper parts of the movable clamp and the fixed clamp have a tightening member pivoted to one of them. The lower portions of the movable and fixed clamps are removably connected to each other by a hook device that is actuated by an operating lever attached to the movable clamp, and the operating lever has a 1. A saddle fusing machine, characterized in that a spring is provided for holding the hook device in a hook engaged state, and the operating lever extends above the device so that it can be operated from the top of the device.