JP2661870B2 - Pipe cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe cutter.

[0002]

2. Description of the Related Art Conventionally, there is a cutter disclosed in Japanese Utility Model Laid-Open No. 62-192362 as a cutter for a pipe made of a synthetic resin material such as vinyl chloride. The cutter has a lower scale and a cutting blade rotatably mounted at predetermined positions on an upper scale having an arcuate pipe receiving portion on a front upper surface, and connects the lower scale and the cutting blade to each other. And the cutting edge below the cutting blade is formed in a mountain shape when viewed from the side.
-32061).

[0003]

By the way, the above-mentioned prior art has an advantage that the shearing force acting on the pipe at the time of cutting is uniformly applied and the shearing force can be reduced. However, when the top of the cutting edge of the cutting blade first cuts into the pipe, the shearing force becomes small, but when it reaches the vicinity of the end of cutting of the pipe, it becomes very heavy, and there is a problem that it is difficult to cut.

The present invention has been made in view of the above situation, and an object of the present invention is to provide a pipe cutter having a large cutting ability capable of cutting a pipe lightly to the end.

[0005]

According to the present invention, the following technical measures have been taken in order to achieve the above object. That is, the present invention includes a main body having a V-shaped pipe receiving portion at a distal end and a handle at a base portion, and a mountain-shaped cutting blade for cutting a pipe in cooperation with the pipe receiving portion. In a pipe cutter in which a cutting blade is axially mounted on a short axis, a cutting blade top position of the cutting blade is shifted with respect to a center of a valley bottom of the pipe receiving portion.

Further, the present invention is characterized in that the position of the top of the cutting blade of the cutting blade is shifted to the short axis side. Further, according to the present invention, the base end of the cutting blade is movably connected via a connecting pin to a long hole provided in parallel with an operation handle having a tip mounted on the lower side of the tip of the main body. It is characterized by having.

[0007]

According to the present invention, when cutting a pipe, the pipe is placed on the pipe receiving portion, and when the handle is operated to start cutting the pipe, the top of the cutting blade cuts into the pipe first, and is lightly applied with a small shearing force. At the beginning of cutting, near the end of cutting, the end of the pipe is cut by the other cutting blade after cutting by the cutting blade on one side where the cutting edge top is shifted, so it can be cut lightly with small shearing force .

Further, the connecting pin moves smoothly in the elongated hole provided in the operation handle and the leverage ratio is improved, so that the cutting ability is improved.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In the drawing, reference numeral 1 denotes a pipe cutter, and a tip 4A
Body having a V-shaped pipe receiving portion 2 in side view and a handle 3 in a base portion, and a blade body having side-view angled cutting blades 5A and 5B for cutting the pipe P in cooperation with the pipe receiving portion 2. A cutting blade 6 to which the cutting blade 5 is fixed, a short shaft 7 for pivotally attaching the cutting blade 6 to the main body 4, and a tip 4A below the pipe receiving portion 2 of the main body 4.
, A connecting member 10 fixed to the operating handle 9, and a cutting blade 6 fitted in a long hole 11 provided in the connecting member 10 in parallel with the operating handle 9. And a connecting pin 12 attached to the base 6B.

The main body 4 has a tip portion 4A having a pipe receiving portion 2 having a substantially U-shaped side surface, the blade body 5 is fitted between the upwardly directed grooves 13, and the upper edges of both side walls have V-shaped pipe receiving portions. 2, the handle 3 at the base has a downward U-shaped cross-sectional shape, the shaft-attached portion of the intermediate cutting blade 6 is opened up and down, and the cutting blade 6 penetrates between both side walls. The lower side of the distal end portion 4A of the main body 4 has a width of about half as shown in FIG.
Can be fitted outside. The main body 4 is provided with shaft holes (not shown) for the short shafts 7 and 8.

The blade body 5 is a plate-like body, and is provided with the cutting blades 5A and 5B having a mountain shape in a side view as described above, and is replaceable with a screw 14 on the side surface of a substantially key-shaped tip portion 6A of the cutting blade 6. It is fixed. And, the cutting blade 5 which is shaped like a mountain of the blade body 5
As shown in FIG. 2, the tops 5C of the pipes A and 5B are shifted from the center 2A of the valley bottom of the pipe receiving portion 2 toward the short axis 7 when the cutting blade 6 is closed. Is cut by the cutting blade 5B before the cut end portion, so that the cut end portion is lightly cut.

That is, when cutting the pipe P, the cutting edge top 5
Due to the displacement of C, near the end of cutting, after cutting the pipe P with the cutting edge 5B on the short axis 7 side from the cutting edge top 5C, the pipe is cut with the cutting edge 5A on the tip side from the cutting edge top 5C. Since the cutting end portion of P is cut, a large shearing force is not required, and cutting can be performed lightly with a small shearing force.

A connecting pin 1 is provided at the base end 6B of the cutting blade 6.
2 is fixed so as to protrude left and right, and a roller 15 is rotatably fitted to both ends of the connecting pin 12 and is prevented from falling off by a C-ring 16. 11, the cutting blade 6 is connected to the operation handle 9. The operation handle 9
Has a substantially U-shaped cross section except for the forked end 9A (FIG. 8,
The connecting member 10 having a U-shaped cross section is fixed to an intermediate portion by a pin 17 so as to protrude toward the handle 3. A long hole 11 is formed in both walls of the connecting member 10.
Is formed, and the cutting blade base end 6B is inserted between the two walls so that the cutting blade base end 6B moves smoothly and the cutting force can be transmitted reliably.

At the base end of the operation handle 9, an opening preventing member 18 formed by bending a wire into a hook shape is engaged.
The hook portion 18A can be hooked on a locking pin 19 attached to the handle 3 of the main body 4 (see FIGS. 1, 2, and 10). The present invention is not limited to the above-described embodiment. For example, the cutting blade 6 and the blade body 5 can be formed into an integral structure, and the cutting blade top 5C is connected to the pipe receiving section valley bottom center 2A.
And the connecting member 10 is integrally formed with the operation handle 9 to form a long hole 11.
For example, the design can be changed as appropriate.

[0015]

As described above, the present invention provides a main body having a V-shaped pipe receiving portion at the distal end and a handle at the base, and a side surface for cutting the pipe in cooperation with the pipe receiving portion. In a pipe cutter in which a cutting blade provided with a viewing angle-shaped cutting blade is axially attached by a short axis, the position of the top of the cutting blade of the cutting blade is shifted with respect to the center of the bottom of the pipe receiving portion. Since it is a feature, it can be cut lightly with a small shearing force even at the end of cutting of the pipe, so that the cutting ability can be improved and hand fatigue can be reduced.

Further, according to the present invention, the base end of the cutting blade may be
It is characterized in that it is movably connected via a connecting pin to a long hole provided in parallel with an operation handle having a tip attached to the lower end of the tip of the main body. As a result, the opening / closing operation of the cutting blade is smooth, the torque transmission is reliable, and the cutting ability can be improved.

[Brief description of the drawings]

FIG. 1 is a front view of an open state showing an embodiment of the present invention.

FIG. 2 is a front view of the embodiment in a closed state.

FIG. 3 is an upper plan view of FIG. 2;

FIG. 4 is a bottom view of FIG. 2;

FIG. 5 is a left side view of FIG. 2;

FIG. 6 is a right side view of FIG. 2;

FIG. 7 is an enlarged view as viewed from an arrow A in FIG. 1;

FIG. 8 is a right side view of FIG. 7;

FIG. 9 is a sectional view taken along line BB of FIG. 1;

FIG. 10 is a view as viewed in the direction of arrow C in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe cutter 2 Pipe receiving part 2A Center of valley bottom 3 Handle 4 Main body 4A Tip part 5 Blade body 5A, 5B Cutting blade 5C Cutting blade top part 6 Cutting blade 7,8 Short axis 9 Operating handle 9A Tip forked part 11 Long hole 12 Connection Pin P pipe

Claims (3)

(57) [Claims] 1. A cutting device having a V-shaped pipe receiving portion at a distal end portion and a handle at a base portion, and a mountain-shaped cutting blade in a side view for cutting a pipe in cooperation with the pipe receiving portion. A pipe cutter in which a blade is axially attached to a short axis, wherein a cutting blade top position of the cutting blade is shifted from a center of a valley bottom of the pipe receiving portion. 2. The pipe cutter according to claim 1, wherein the position of the top of said cutting blade is shifted toward said short axis. 3. A base end of the cutting blade is movably connected via a connecting pin to an elongated hole provided in parallel with an operation handle having a tip mounted on a lower side of a tip of the main body. The pipe cutter according to claim 1 or 2, wherein: