JPH0451937Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a pipe cutter used for cutting underground pipes such as gas pipes and water pipes from the inside.

(Conventional technology) When removing pipes buried underground in gas, water, etc. piping work, it is necessary to excavate a trench along the pipe and cut the pipe from the outside at both ends. The method is to either remove the pipe, or to dig two holes at an interval of the length to be removed, cut the pipe in the hole, and then pull out the pipe from one of the holes and remove it. However, these methods require large-scale work and have poor work efficiency, and have the disadvantage that the road must be closed if the pipe crosses the road. Therefore, a pipe cutter has been developed that allows cutting from the inside of the pipe by drilling a hole, cutting the pipe inside the hole, and then inserting the cutter into the removed pipe to the desired cutting position. This type of pipe cutter was also proposed as Utility Model Application No. 76417 (1983). However, since these conventional pipe cutters are all integrated, they can only cut to a depth (length) of about 1 meter at most, and are used to cut long pipes that cross the road from one side of the road. Such a thing was impossible.

(Problem to be solved by the invention) The purpose of the invention is to solve the above-mentioned conventional problems and to create a pipe cutter that can cut pipes buried underground etc. from the inside at any depth. It was completed as.

(Means for Solving the Problems) The present invention includes a cutter portion that cuts into a pipe by widening the distance between the cutter and the receiving portion on the opposite side by advancing a set screw provided inside the main body; An engaging portion that is engaged with the engaging portion formed at the rear end of the main body of the cutter portion and the engaging groove 12 formed at the rear end of the set screw so that rotational force is transmitted to each of the engaging portions and the engaging groove 12 formed at the rear end of the push screw. A series-connected intermediate connecting rod in which a protrusion, an engaging portion, and an engaging portion and an engaging groove capable of engaging with the protrusion are formed on an outer cylinder and a connecting shaft, and an engaging portion and a connection of the outer cylinder of the intermediate connecting rod. The device is characterized in that it is comprised of an outer cylinder portion with a handle that is connected to the engagement groove of the shaft, and an operating portion that includes a rotating shaft with a handle.

(Example) Next, the present invention will be explained in more detail with reference to the illustrated example.

The pipe cutter of the present invention is composed of a cutter part A, an intermediate connecting rod B, and an operating part C, as shown in FIG.

The cutter part A, as shown in an enlarged view in FIG. It is rotatably attached with a part of its outer periphery always protruding from the outer periphery of the main body 1. Further, an inclined hole 4 is formed on the opposite side of the tip end of the main body 1, and a slider 5 having a roller-shaped receiving portion 6 on the side surface of the tip end is fitted inside the inclined hole 4. The base end of the slider 5 is pressed by a set screw 2, and when the set screw 2 is rotated and moves forward by the action of a threaded portion 7 formed between it and the inner circumferential surface of the main body 1, the slider 5 moves forward. from the inclined hole 4 of the main body 1
As shown by the imaginary line in the figure, the receiving part 6 on the side surface of the tip protrudes outward and presses against the inner surface of the pipe 50,
The cutter 3 of the main body 1 is pressed against the inner peripheral surface of the pipe 50. The slider 5 is always urged to retreat inward by a pin 9 with a spring 8 at the tip of the main body 1. The main body 1 of the cutter part A explained above is a cylindrical main body rear part 1.
0, and the rear end is marked with figures 1 and 3.
An engaging portion 11 having an uneven shape as shown in the figure is formed. Further, a T-shaped engagement groove 12 is formed at the rear end of the set screw 2.

As shown in FIG. 1, the intermediate connecting rod B consists of an outer cylinder 13 and a connecting shaft 14 inside the outer cylinder 13. As shown in FIG. 3, the outer cylinder 13
An engaging portion 15 that engages with the engaging portion 11 of the cutter portion A described above is formed at the tip of the cutter portion A, and
At the tip of the connecting shaft 14, there is a T-shaped protrusion 1 that engages with the T-shaped engagement groove 12 of the set screw 2 of the cutter portion A.
6 is formed. Further, at the other end of the outer cylinder 13 and the connecting shaft 14, an engaging portion 17 having the same shape as the cutter portion A and a T-shaped engaging groove 18 are formed. Therefore, the intermediate connecting rod B can be connected to the cutter portion A, and a large number of intermediate connecting rods B can also be connected in series. A narrow diameter portion 19 is formed in the middle of the connecting shaft 14, and a screw 20 screwed from the outer cylinder 13 projects outside of this narrow diameter portion 19 to prevent the connecting shaft 14 from falling off and to prevent the connecting shaft 14 from falling off. outer cylinder 1
The amount of movement relative to 3 is limited.

As shown in FIG. 1, the operating portion C is an outer cylindrical portion with an engaging portion 21 and a T-shaped protrusion 22 having the same shape as the engaging portion 15 and T-shaped protrusion 16 of the intermediate connecting rod B at its tip. 23 and a rotating shaft 24. A ratchet type handle 25 is attached to the base end of the outer cylinder portion 23, and a rotary handle 26 is fixed to the base end of the rotating shaft 24. A coil spring 27 is provided between the rotary shaft 24 and the outer cylindrical portion 23, and always springs the outer cylindrical portion 23 toward the distal end side.

(Function) In order to cut a pipe that is buried, for example, across a road using the pipe cutter of the present invention configured as described above, first, a hole is dug on one side of the road, and inside the hole, the pipe is cut from the outer periphery. Cut to a specified length. Next, insert the cutter part A into the inside of the pipe, and with the T-shaped protrusion 16 of the connecting shaft 14 of the intermediate connecting rod B protruding beyond its outer cylinder 13, the T-shaped protrusion 16 of the threaded rod 2 of the cutter part A. After engaging the engagement groove 12 from the side, the outer cylinder 13 is moved forward to connect the engagement part 11 of the rear body 10 of the cutter part A with the outer cylinder 1.
3 is engaged with the engaging portion 15 of No. 3. After that, the intermediate connecting rod B is pushed into the inside of the pipe, and the intermediate connecting rods B are connected in series one after another, and the cutter part A is pushed into the pipe until just before the cutting position. Finally, the operating part C is connected, but at this time, the T-shaped protrusion 22 of the rotating shaft 24 is pushed out from the outer cylinder part 23 against the spring force of the coil spring 27, and the connection to the intermediate connecting rod B is made. conduct. The spring force of the coil spring 27 causes the outer cylinder portion 23 to move forward, and its engaging portion 21 is engaged with the engaging portion 21 of the intermediate connecting rod B. As shown in FIG. 4, in the engaged state, the T-shaped protrusions 16, 22 and the T-shaped engagement grooves 12, 18 are housed inside the outer cylinders 13, 23, and there is no possibility of them coming off.

In this way, if the cutter part A is pushed to a predetermined position and the rotary handle 26 of the operating part C is rotated, the rotational force is transmitted through the rotary shaft 24 and the connecting shaft 14 of the intermediate connecting rod B. The force is transmitted to the set screw 2, causing the slider 5 at the tip of the set screw 2 to protrude from the main body 1 of the cutter portion A, thereby increasing the distance between the cutter 3 and the receiving portion 6 on the opposite side. In addition, by rotating the ratchet type handle 25 of the operation part C, the rotational force is applied to the outer cylinder part 23 and the outer cylinder 1 of the intermediate connecting rod B.
3 to the main body 1 of the cutter portion A, causing the main body 1 to rotate. As a result, cutter 3 of main body 1
rotates together with the main body 1 inside the pipe and cuts the pipe. In this way, by rotating the handle 26, the slider 5 and the receiving part 6 are projected, and the cutter 3 on the opposite side is bitten into the inner surface of the pipe, and by rotating the handle 25, the cutter 3 is rotated, so that the pipe can be cut into the desired shape. It will be cut at the position.

After cutting is completed, the handle 26 is reversed and the slider 5 is retreated into the main body 1 by the force of the spring 8. After that, the operation part C and the intermediate connecting rod B are successively separated and inserted into the pipe in the reverse order of the insertion procedure. All you have to do is pull it out.

Although the above embodiment uses a T-shaped protrusion and a T-shaped engagement groove, the shape of this part is not limited to this, and various shapes such as L-shape and V-shape may be used. Needless to say, you can do that too. Further, in the embodiment, the slider 5 is urged to retreat inward by a pin 9 with a spring 8, but the tip of the set screw 2 is made into a T-shaped engagement part, and the base end of the slider 5 is A T-shaped engagement groove that is slidably engaged with the T-shaped engagement portion of the set screw 2 may be formed to move the slider 5 up and down in response to the up and down movement of the set screw 2. In this case, it is preferable to provide the main body 1 with a pin for guiding the slider 5.

(Effects of the invention) As explained above, the invention forms the cutter part, the intermediate connecting rod, and the operating part separately,
By using the required number of intermediate connecting rods, they can be used in one piece, and by rotating the main body and set screw individually, the pipe can be cut at any depth from the open end, For example, the road width
This makes it possible to cut pipes that are buried about 10 meters below the road so as to cross the road from one side of the road. Moreover, the pipe cutter of the present invention can be disassembled into compact individual parts, so there is no need to drill large holes, and it is easy to store and transport. Can cut pipes. Therefore, the present invention has extremely great practical value as a pipe cutter that eliminates the problems of the conventional pipe cutter.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing an embodiment of the present invention in an exploded state, Fig. 2 is an enlarged sectional view of the cutter part, and Fig. 3 is a partially cutaway enlarged view of the connecting part between the cutter part and the intermediate connecting rod. The perspective view and FIG. 4 are cross-sectional views showing a state in which the whole is connected. A... Cutter part, B... Intermediate connecting rod, C...
Operation section, 1...Main body, 2...Press screw, 3...Cutter, 5...Slider, 6...Receptacle, 13...
Outer cylinder, 14... Connection shaft, 15... Engagement part,
16...Protrusion, 17...Engagement portion, 18...Engagement groove, 21...Engagement portion, 22...Protrusion, 23...Outer cylinder portion, 24...Rotating shaft.

Claims (1)

[Scope of utility model registration request] A cutter part A that allows the cutter 3 to cut into the pipe 50 by expanding the distance between the cutter 3 and the receiving part 6 on the opposite side by advancing a set screw 2 provided inside the main body 1, and a main body of the cutter part A. An engaging part 15 and a protrusion that are engaged with an engaging part 11 formed at the rear end of the screw 1 and an engaging groove 12 formed at the rear end of the set screw 2 so that rotational force is transmitted to each of the engaging parts 15 and 15 individually. 16 and an engaging part 17 and an engaging groove 18 that can be engaged with the engaging part 15 and the protrusion 16 are formed on the outer cylinder 13 and the connecting shaft 14.
and an operating part C, which includes an outer cylinder part 23 with a handle and a rotating shaft 24 with a handle, which are connected to the engaging part 17 of the outer cylinder 13 of the intermediate connecting rod B and the engaging groove 18 of the connecting shaft 14, respectively. A pipe cutter characterized by being composed of.