JPH1177421A - Pipe cutting cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe cutting cutter that can easily bite the well face of a pipe even if the wall thickness of the pipe is thin and can perform cutting and chamfering simultaneously. SOLUTION: The tip section of a shaft 1 which is protrusively provided with a tapered and thin cutting blade 2 is formed of inclined chamfering blades 6 and 6, which are extended perpendicular to this cutting blade 2. This allows the cutting blade 2 to cut a pipe and the chamfering blades 6 to chamfer the pipe continuously. If the cutting blade 2 and the chamfering blades 6 are made a symmetrically shape in the front and back direction of rotation, cutting and chamfering can be done whichever direction a pipe cutter is rotated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool for a pipe cutter used for cutting a synthetic resin pipe or the like.

[0002]

2. Description of the Related Art A wheel cutter having a sharpened tip is widely used as a blade for a pipe cutter used for cutting a synthetic resin pipe or the like. The wheel cutter gradually cuts into the wall of the pipe while being rotated in the circumferential direction relative to the pipe to be cut, and cuts the pipe.

However, when cutting a thin synthetic resin pipe, the pipe pressed from a direction perpendicular to the surface by a wheel cutter bends inward due to this pressing force, so that the cutting edge is well formed on the wall of the pipe. I didn't cut it. In addition, since the cut surface by the wheel cutter is a plane perpendicular to the axis of the pipe, in many cases, the cut end surface needs to be subjected to secondary processing to be chamfered.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and is intended for a pipe cutter capable of easily cutting into the wall of a pipe even when the pipe is thin, and capable of simultaneously performing cutting and chamfering. This was done to provide a knife.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a blade for a pipe cutter having a tapered and thin cutting blade protruding from a tip of a shaft. An inclined chamfer blade extending in a direction perpendicular to the cutting blade is formed. In addition, it is preferable that these cutting blades and chamfering blades have shapes that are symmetric in the front-rear direction of rotation.

[0006] Since the blade for a pipe cutter of the present invention has a tapered and thin cutting blade, it can be easily cut into the surface of the pipe unlike a conventional rotary disk-shaped blade. For this reason, a thin synthetic resin pipe that is easily bent can be cut well. Also, since the pipe cutter blade of the present invention has an inclined chamfer blade extending in a direction perpendicular to the cutting blade at the tip of the shaft,
The end face of the pipe cut by the cutting blade can be continuously chamfered by the chamfering blade, and secondary processing for chamfering is unnecessary. In addition, if the cutting blade and the chamfer blade are formed in a shape symmetrical in the front-rear direction of rotation, there is an advantage that cutting can be performed by rotating the blade in any direction.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. 1A and 1B show a cutting tool for a pipe cutter of the present invention, wherein FIG. 1A is a plan view, FIG. 1B is a perspective view, FIG. 1C is a front view, and FIG. As shown in these figures, the cutting tool for a pipe cutter according to the present invention includes a shaft 1 and a cutting blade 2 protruding from a tip of the shaft. In this example, the shaft 1 has a cylindrical shape having a slit 3 in the center, and the cutting blade 2 is fitted in the slit 3 so as to be exchangeable, and is fixed by a pin 4.

The cutting blade 2 is tapered and thin, and has cutting blades 5 on both sides. The tip of the cutting blade 2 has a bilateral triangular symmetrical shape, is easily cut from the sharp tip with respect to the pipe P, and the blade for a pipe cutter of the present invention is indicated by an arrow in FIG. In any of the directions shown, the pipe P can be cut using the cutting blades 5 on both sides.

On the other hand, a chamfering blade 6 extending in a direction perpendicular to the cutting blade 2 is formed at the tip of the shaft 1. The chamfer blade 6 has a shape that is inclined such that its center in contact with the cutting blade 2 is high and becomes lower toward the outside of the shaft 1, and both sides thereof are cut off diagonally symmetrically. Therefore, even when the pipe cutter blade of the present invention rotates in any direction indicated by the arrow, the chamfer can be similarly performed. In addition, this chamfer blade 6
Are formed symmetrically on both sides of the cutting blade 2.

FIG. 2 shows a pipe cutter incorporating the blade for a pipe cutter of the present invention. In the example of FIG. 2, the cutter for a pipe cutter is stored in a hole 8 formed in the main body 7. The whole is repelled toward the pipe P by a spring 10 provided between the shaft 1 and the cap 9.

Reference numeral 11 denotes a roller plate pivotally attached to the main body 7 by a shaft 12, and 13 denotes a roller plate
It is a handle pivoted by. A link 15 is provided between the handle 13 and the main body 7 to constitute a toggle mechanism. The main body 7 and the roller plate 11 have a curved shape so as to hold the pipe P, and are provided with two rollers 16 and 17 each. For this reason, when the handle 13 is closed, the pipe P is supported by the four rollers 16 and 17 as shown in FIG. Is performed.

At this time, the pipe P can be prevented from being deformed by disposing the blade for the pipe cutter close to the roller 16 as shown in the figure. If the cutting blade 2 has a shape symmetrical in the front-back direction of rotation, the pipe P can be cut in any direction, which is convenient.

When the cutting blade 2 cuts into the wall surface of the pipe P to a predetermined depth in this manner, subsequently, as shown in FIG. Perform chamfering. The chamfer blade 6 is also symmetrical in the front-rear direction of rotation, so that the pipe cutter can be chamfered without any problem even when rotated in any direction. FIG. 4 shows a cut portion of the pipe P which is chamfered.

[0014]

As described above, the blade for a pipe cutter according to the present invention has the advantages that it can easily bite into the wall of the pipe even when the pipe is thin, and that cutting and chamfering can be performed in a series of operations. is there. Furthermore, as shown in the embodiment, if the cutting blade and the chamfering blade have a shape symmetrical in the front-rear direction of rotation, there is an advantage that cutting and chamfering can be performed even if the pipe cutter is rotated in any direction.

[Brief description of the drawings]

FIG. 1 is a view showing a pipe cutter blade of the present invention;
(A) is a plan view, (B) is a perspective view, (C) is a front view, and (D) is a side view.

FIG. 2 is a partial cross-sectional view of a pipe cutter incorporating the pipe cutter blade of the present invention.

3A and 3B are diagrams showing a state of chamfering, wherein FIG. 3A is a sectional view in the axial direction, and FIG. 3B is a sectional view in the direction perpendicular to the axis.

FIG. 4 is a perspective view showing a cut portion of the pipe P which has been chamfered.

[Explanation of symbols]

 P pipe 1 shaft 2 cutting blade 3 slit 4 pin 5 cutting blade 6 chamfering blade 7 main body 8 hole 9 cap 10 spring 11 roller plate 12 axis 13 handle 14 axis 15 link 16 roller 17 roller

Claims (2)

[Claims] 1. A cutting tool for a pipe cutter having a tapered and thin cutting blade protruding from a tip of a shaft, wherein an inclined chamfering blade extending in a direction perpendicular to the cutting blade is formed at a tip of the shaft. A knife for a pipe cutter, characterized in that: 2. A cutting tool for a pipe cutter according to claim 1, wherein the cutting blade and the chamfering blade have a shape symmetrical in the front-rear direction of rotation.