JPH0451936Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a pipe cutter suitable for cutting pipes buried underground or in concrete from the inside.

(Prior art) As a pipe cutter for cutting various types of pipes buried underground or inside the walls of buildings, etc. from the inside, as shown in Japanese Patent Publication No. 17472/1980, a pipe cutter is used to cut various types of pipes buried underground or inside the walls of buildings. Attach two fixed rollers and one cutting roller to the tip of the circular tube to be inserted,
The cutting roller is made to protrude in the radial direction by the grooved cam at the tip of the operating rod inserted into the circular pipe, and the entire circular pipe is rotated by the handle at the upper end, so that the cutting roller gradually bites into the inner surface of the pipe. A device that performs cutting is known. However, in this type, a cutting roller must be provided inside the tip of the circular tube so that it can slide freely in the radial direction, and a fixed roller must also be provided, so the structure is complicated and a product with a small diameter cannot be manufactured.

Further, U.S. Patent No. 3,581,395 discloses a pipe cutter in which a knife-shaped cutter is provided at the tip of a circular tube to be inserted into the pipe to be cut, but since the cutter is knife-shaped, The drawback was that it could only cut soft pipes.

(Problems to be solved by the invention) The present invention solves these conventional drawbacks, is easy to manufacture, can be manufactured for small diameters, and can be used not only for soft pipes but also for metal pipes. It was developed for the purpose of being a pipe cutter that can also cut pipes.

(Means for Solving the Problems) The present invention provides a substantially cylindrical body at the tip of a tube that is inserted into the pipe to be cut and rotated by a handle attached to the base end of the tube. A disk-shaped cutter with a blade protruding from the main body is rotatably supported on the side, and the main body is inserted into the inclined hole formed in the main body so that the side surface of the tip approximately corresponds to the cutting position of the cutter. A slider protruding from the opposite side is slidably mounted thereon, and a threaded rod for pressing the slider at its tip is screwed into the inside of the tube so as to be movable forward and backward.

(Embodiment) Next, the present invention will be explained in detail with reference to the illustrated embodiment. Ratchet handle attached by
Reference numeral 4 denotes a substantially cylindrical main body integrally fixed to the tip of the tube body 1. A disc-shaped cutter 5 is pivotally attached to one side near the tip of the main body 4 by a bolt 15 so that its blade always protrudes from the outer peripheral surface of the main body 4. The main body 4 also has an inclined hole 6 extending obliquely from the center of the upper end toward the side opposite to the side from which the cutter 5 protrudes, and a slider 7 is slidably inserted into the inclined hole 6. installed on. As shown in the figure, the slider 7 has a tip side surface 8 that is approximately parallel to the cylindrical outer circumferential surface of the main body 4.
This tip side surface 8 is designed to protrude from the main body 4 approximately corresponding to the cutting position of the cutter 5. A threaded rod 10 is provided at the center of the tube body 1 and has a male threaded portion 9 that is screwed into a female threaded hole in the body 4. The rod 10 can be moved back and forth within the body 4 by rotating a handle 11 at the base end. It has a movable structure. The tip of this threaded rod 10 is for pressing the base end 12 of the slider 7 and pushing out the slider 7 against a spring 13 provided at the tip of the main body 4.
Note that 14 is a coil spring provided on the outer periphery of the protrusion of the threaded rod 10 in order to provide appropriate resistance between the handle 2 and the handle 11, and is used to rotate the handle 11 at the same time when the handle 2 is rotated. It is something. (Function) As shown in the figure, the pipe body 1 is inserted into the pipe 30 to be cut to a desired depth, and the threaded rod 10 provided inside the pipe body 1 is inserted into the handle 11. advance the threaded rod 10 by
Press the slider 7 at the tip of the main body 4 with the tip of the pipe 30 and slide the slider 7 along the inclined hole 6 so that the side surface 8 of the tip protrudes from the main body 4.
the inner wall of the As a result, the blade of the disc-shaped cutter 5 which is pivotally supported on the opposite side of the main body 4 and which is projected from the main body 4 bites into the inner wall of the pipe 30, and the main body 4 is connected to the side surface 8 of the tip end of the slider 7 and the cutter. 5 and is in a non-contact state with the pipe 30. If you rotate handle 2 in this state,
The frictional resistance that occurs when rotating the main body 4 is mainly due to the side surface 8 of the tip end, and the main body 4 is rotated with a small force. And Katsuta 5 is pipe 30
The pipe 30 is cut while rolling on the inner wall of the pipe.
As the cutting progresses in this way, the handle 11
When the handle 2 is rotated while the slider 7 is further rotated and the handle 2 is rotated, the cutter 5 gradually bites deeper into the inner wall of the pipe 30 and rotates to cut the pipe 30. After cutting is completed, when the threaded rod 10 is retreated, the slider 7 is pulled into the inclined hole 6 by the action of the spring 13, and the tubular body 1 can be easily pulled out from the inside of the pipe 30.

(Effect of the invention) As explained above, the pipe cutter of the present invention has a disc-shaped cutter blade protruding from one side of the main body, and only the side surface of the tip of the slider provided on the opposite side touches the inner wall of the pipe. The cutter cuts vertically into the inner wall of the pipe by touching it, and cuts while rotating the main body, so it has low frictional resistance and can easily cut not only soft pipes but also metal pipes with little effort. Can be cut. In addition, the pipe cutter of the present invention has a structure in which the cutter is attached directly to the main body and is made to protrude from the main body by pressing the slider with a threaded rod, compared to conventional products in which the cutter is slidably attached to the main body. It has the advantage that it is extremely simple and can also be manufactured for small diameters. Therefore, the present invention has extremely great practical value as a pipe cutter that solves the drawbacks of the conventional pipe cutter.

[Brief explanation of drawings]

FIG. 1 is a central vertical sectional view showing an embodiment of the present invention. 1...Pipe body, 2...Handle, 4...Body, 5
...Katsuta, 6...Slanted hole, 7...Slider, 8
...Tip side, 10...Threaded rod, 30...Pipe.

Claims (1)

[Scope of utility model registration request] A tube body 1 inserted into a pipe 30 to be cut and rotated by a handle 2 attached to its base end.
A substantially cylindrical main body 4 is provided at the tip of the main body 4, and a disc-shaped cutter 5 with a blade protruding from the main body 4 is rotatably supported on one side of the main body 4, and is formed within the main body 4. A slider 7 is slidably attached to the inclined hole 6 which has been protruded from the opposite side of the main body 4 so that the side surface 8 of the distal end substantially corresponds to the cutting position of the cutter 5. A pipe cutter characterized in that a threaded rod 10 that presses a slider 7 is screwed so that it can move forward and backward.