JPH026983Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a pipe clamping device for an embedded pipe cutter, in which a pipe gripping casing necessary for cutting an embedded pipe is attached to the side of the cutting blade mounting case. In the configuration, a clamp chain is provided in the casing, and the clamp chain is wrapped around a pipe embedded in the ground, concrete, etc., and clamped to tighten or remove the chain. The present invention relates to an apparatus in which the above-mentioned casing can be applied on the top surface of the casing.

(Conventional technology) Conventionally, pipe cutters that are generally used for cutting embedded pipes have been used, but there is no one specifically designed for cutting embedded pipes, and for this reason, the pipe clamp is attached to the side of the case where the cutting blade is attached. As shown in Japanese Utility Model Application Publication No. 60-56427, in a swingable pipe grip housing, the part of the upper bracket corresponding to about half the circumference of the pipe is made into a V shape, and the lower bracket (the part of the pipe) is passed through the upper bracket. After installing a clamping member around the remaining half circumference and sandwiching the pipe,
A structure in which the lower bracket is swung by a swiveling means such as a cylinder and clamped is known, but it remains to be seen whether it can be used for cutting embedded pipes that require portability. This is because unless the lower bracket is removed from the upper bracket, it is not possible to clamp the embedded pipe in which only the cut portion is exposed.

(Problem to be solved by the invention/Purpose of the invention) Recently, buried pipes, such as water pipes and gas pipes, are cut underground by inserting a pipe cutting knife into an open trench cut on the ground surface. It has become more common to cut the implant while it is still embedded. For this reason, the demand for a dedicated cutter has increased, but the pipe cutter cannot be sufficiently miniaturized unless the structure of a small pipe clamp device suitable for cutting embedded pipes is solved. This is the problem that the present invention attempts to solve, and the purpose of the present invention is to give concrete form to this problem.

(Means for Solving the Problems) The present invention solves the above-mentioned problems and meets the purpose of the invention. Specifically, the present invention includes a cutting blade mounting case 1 and a connecting shaft 6 on the side of the case. A pair of pressing teeth 11 are in contact with the lower end surface of the bracket 9 of the pipe gripping housing 8 in the length direction of the outer surface of the cutting pipe P.
A two-pronged projecting piece 12 for attaching the chain is provided between the presser teeth 11, and a shaft rod 13 is passed to the projecting piece 12, and one end of the swinging piece is fitted into the shaft rod 13 so as to be able to swing. A chain hook 15 is formed on the upper surface of the free end of the clamp chain 14, one end of the clamp chain 16 is attached to the forked protrusion 12, and the clamp chain 16 is passed through the bracket 9 of the casing 8 from the top surface. A pipe clamp for an embedded pipe cutter characterized in that the lower end of a threaded rod 18 having a nut member 20 screwed thereon is connected to the longitudinal center of the swinging piece 14 by a shaft 19. This is a device.

(Example) Figures 1 and 2 show a pipe cutter equipped with the pipe clamp device of the present invention, 1 is a cutting blade mounting case, and a flexible shaft such as a wire inserted from the upper insertion opening 2 , drives an internal gear system, and the last gear of the system drives a disk provided with an eccentric pin, which engages a linear cam piece fixed to a reciprocating cutting blade mounting shaft 3. A saw blade 4, which is an example of a cutting blade, is attached to the shaft 3. In addition, the case 1 has a connecting shaft 6 that protrudes in the side direction intersecting the moving direction of the shaft 3 on the protruding piece 5 that protrudes from the lower surface.
is provided, and its connecting shaft 6 is passed through a bracket 9 of a pipe gripping housing 8 to be freely swingable. The pipe gripping housing 8 consists of a bracket 9 and a pipe holding piece 10 fixed to the lower surface of the bracket 9, and a length of the embedded pipe P is attached to the tip of the holding piece 10 as shown in FIGS. The presser teeth 11, 11 which are in contact with two places on the outer surface in the horizontal direction are protruded, and the presser teeth 11,
A two-pronged projecting piece 12 for attaching a chain is protruded between 11, a shaft rod 13 is passed to the projecting piece 12, and one end of a swinging piece 14 having a two-pronged free end can be swung around the shaft. A chain hook 15 is provided on the upper surface of the bifurcated portion. Also, at the bottom of the shaft rod 13 is a clamp chain 1.
One end of each of the chain shafts 17 protruding outward from each of the parts 6 is fitted to support the shaft.

The bracket 9 of the pipe gripping housing 8 has a threaded rod 1 whose lower end projects to the lower surface of the holding piece 10 and is connected to the center of the length of the swinging piece 14 by a shaft 19.
A nut member 20 screwed onto the upper end of the rod 18 is hung on the upper surface of the top of the bracket 9 to support it, as shown in FIG.

The clamp chain 16 is wound around the embedded pipe P and then fitted into the two prongs of the swinging piece 14, and has a length such that a suitable chain shaft 17 can be hooked onto the chain hook 15 and engaged.

(Operations and Effects of the Invention) The present invention has an opening for bringing in an embedded pipe cutter, which has a hollow shape around the entire outer periphery of the embedded pipe P, in the vicinity of the cutting point of the embedded pipe P, using the configuration described above. The connecting body of the cutting blade attachment case 1 and the pipe gripping housing 8 is brought into the opening, and the threaded rod 18 is inserted into the opening.
Loosen the nut member 20 in advance to lower the free end of the swinging piece 14 from the position shown in Figures 1 and 3, wrap the clamp chain 16 around the embedded pipe P as shown in Figure 3, and tighten the chain as appropriate The shaft 17 is connected to the swinging piece 14
Prepare the clamp by hooking it onto the chain hook 15, and then screwing the nut member 20 through the threaded portion of the threaded rod 18 at the top of the bracket 9 of the pipe gripping housing 8, thereby tightening the screw. Rod 18
and the free end of the swinging piece 14.

In this way, the clamp chain 16 is connected to the embedded pipe P.
At the same time, the presser teeth 11 also bite and clamp. With this, the pipe gripping housing 8
Since the cutting blade does not move, the cutting blade mounting shaft 3 of the cutting blade mounting case 1 is reciprocated by a flexible shaft, and the saw blade 4 in contact with the outer periphery of the cut portion of the embedded pipe P performs the cutting. As the cutting progresses, the cutting blade case 1 is swung by the connecting shaft 6, and the saw blade 4 is swung in the direction of the arrow in FIG. 1 to advance the cutting.

The pipe clamp device of the present invention includes several presser teeth 11 provided at the tip of a pipe gripping housing 8, and a swinging piece 14 whose one end is pivotally supported between the appropriate presser teeth 11.
The free end of the clamp chain 16 is swung in the pulling direction by screwing the nut member 20 onto the threaded rod 18 on the top surface of the bracket 9 of the housing 8 and pulling it up, thereby tensioning the clamp chain 16. By simply rotating the nut member 20 screwed into the threaded rod shown on the upper surface of the top of the bracket 9, the embedded pipe can be clamped by the clamp chain and the clamp can be loosened, so it must be used in narrow spaces. The preparation work for cutting the embedded pipe, which is necessary, can be made easier, and it is also easy to reduce the weight and can be easily carried.

[Brief explanation of the drawing]

The accompanying drawings show an embodiment of the present invention, in which FIG. 1 is a partially cutaway side view, FIG. 2 is a partially cutaway enlarged front view of the clamping device, and FIG. 3 is an enlarged vertical side view of the main part. 1... Cutting blade attachment case, 4... Cutting blade (saw blade), 6... Connecting shaft, 8... Pipe gripping housing,
9... Bracket, 11... Presser tooth, 12... Bifurcated projecting piece, 14... Rocking piece, 15... Chain hook, 16... Clamp chain, 17... Chain shaft, 18... With screw Rod, 20...Nut member.

Claims (1)

[Scope of utility model registration request] A cutting blade attachment case 1 and a pipe gripping housing 8 that is swingably connected by a connecting shaft 6 on the side of the case.
A pair of presser teeth 11 are provided on the lower end surface of the bracket 9 of the pipe gripping housing 8 in contact with the outer surface of the cut pipe P in the length direction, and a bifurcated protrusion for attaching a chain is provided between the presser teeth 11. Protrude the piece 12, pass the shaft rod 13 to the protruding piece 12, and attach one end to the shaft rod 1.
A chain hook 15 is formed on the upper surface of the free end of the swinging piece 14 which is swingably fitted into the two-pronged projecting piece 1.
2, one end of the clamp chain 16 is attached to the threaded rod 1, which is passed through the bracket 9 of the housing 8 from the top surface, and a nut member 20 is screwed onto the top surface.
8. A pipe clamp device for an embedded pipe cutter, characterized in that a lower end portion of the swing piece 14 is connected to a center portion in the longitudinal direction of the swing piece 14 by a shaft 19.