JPH0451932Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pipe cutter, and particularly to a pipe cutter that can cut pipes such as gas pipes and thin-walled stainless steel pipes.

[Conventional technology and problems]

In general, a pair of support arms that are attached so as to be able to approach and separate from each other are provided with pipe holding means such as rotary support rollers facing each other, and at least one part of the pipe on the outer periphery of the pipe to be cut (hereinafter abbreviated as "pipe") At least one of the pipe holding means is elastically movable in the radial direction of the pipe, and a cutting means such as a cutting tool is fixed to the support arm, so that the holding means holds a predetermined amount of bullets. The present applicant previously filed an application for a pipe cutter (Utility Model Application Publication No. 51687/1987) in which the cutting means comes into contact with the outer periphery of the pipe and can cut the pipe only when the pipe is displaced repulsively.

Further, a cutting means is disposed at one end of the pipe cutter body, a plurality of rollers are arranged opposite to each other at the other end, the pipe is held between the cutting means and the plurality of rollers, and the pipe cutter or the pipe is rotated relative to each other. However, a pipe cutter is also known in which the pipe can be cut by sequentially moving the cutting means in the radial direction of the pipe.

In addition, in order to securely hold the pipe cutter against the pipe to be cut, a pipe cutter equipped with a guide having a diameter approximately equal to the outside diameter of the pipe (1983-
40149) and a cutter (Utility Model Publication No. 49-148) in which this guide is elastically attached to the main body of the device are already known. However, most of these cutters have a structure in which the cutting edge of the cutter itself protrudes inward from the pipe guide even when the pipe cutter is not in use, so care must be taken when handling it and safety is compromised. However, it was not desirable. When using this invention,
The pipe can be cut while holding the pipe securely.
Another object of the present invention is to provide a pipe cutter that does not protrude from the pipe guide when not in use and is safe to handle.

[Means for Solving the Problems] In order to solve the above problems, according to the present invention, a cutter support is pivotally mounted facing each other on each of a pair of support arms that are attached so as to be able to approach and separate from each other. Pipe guides having inner peripheral portions having a curvature approximately equal to the outer diameter of the pipe to be cut are elastically mounted on each of the cutter support stands, and a plurality of roller cutters are mounted on each of the cutter support stands, respectively. The cutting edge of each roller cutter is positioned radially outward of the inner circumferential portion of the pipe guide that is not in a pipe holding state, and the roller cutter attached to each cutter support is A pipe cutter is provided, which is characterized in that the pipe cutter is positioned in the same plane as the pipe cutter.

〔Example〕

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a front view of a pipe cutter 10 according to the present invention, in which a pair of support arms 1 and 3 each have approximately S
They are formed in a letter shape and are rotatably connected around a joint portion 5 that serves as a fulcrum.

On the jaws 7 and 9 of each of the support arms 1 and 3, cutter supports 13 and 15 are mounted with four roller cutters 11A, 11B, 11C and 11D as means for cutting the pipe 20.
7 and 19 for rotation.

Roller cutters 11A, 11B, 11C and 1
The cutters 1D are rotatably attached to both ends of the cutter support stands 13 and 15 by cutter pins 21, respectively, and the cutters 11A,
11B, 11C and 11D are arranged so as to be located on the same plane 12 (FIG. 3).

Pipe 20 to be cut (hereinafter referred to as pipe 20)
Pipe guides 23 and 2 as means for holding
5 will be explained. FIG. 2 is an external perspective view of only the pipe guide unit 23 or 25, and according to the present invention, the pipe guides 23 and 25 have an inner peripheral portion 27 having a curvature a approximately equal to the outer diameter of the pipe 20 to be gripped. or 29, and in this example, the pipe 20
In order to maximize the contact area with the pipe, when the two pipe guides 23 and 25 face each other and come into contact with each other, the inner circumferential portions 27 and 29 form a circle that almost coincides with the outer circumference of the pipe. is formed.
Further, the pipe guides 27 and 29 have a flat surface 35 or 37 at the top thereof that is substantially parallel to the end surface 31 or 33, and each roller cutter 11A, 11B, 1 is provided at the center.
It has slits 39A, 39B, 39C and 39D corresponding to 1C and 11D for inserting and removing them. In this embodiment, these slits 39A, 39
B, 39C and 39D are roller cutters 11
A, 11B, 11C, and 11D, and both ends of the cutter supports 13 and 15 that support them have a sufficient width dimension b for insertion and removal. By changing the shape of the roller cutter 11
The width dimension b may be reduced so that only the tip portions of A, 11B, 11C and 11D can be inserted and removed,
Further, the shape of the slit may also be, for example, an inverted V-shape.

Two pipe guides 23 formed as described above
and 25 are mounted on the cutter support stands 13 and 15 facing each other so as to be elastically movable in the radial direction of the pipe, but in this embodiment, the above-mentioned flat surface 35 or 37 and the support Springs 45 and 47 are provided between the table bases 41 and 43 (FIG. 1).

That is, the support arms 1 and 3 are connected to the cutter support base 13.
and 15, roller cutters 11A, 11B, 11C and 11D are operated in synchronization with the support arms 1 and 3, and are elastically movable in the radial direction of the pipe. , or by having the pipe guides 23 and 25 that are elastically movable also with respect to the cutter supports 13 and 15, the pin 1 of the pipe guides 23 and 25 can be moved elastically.
Approaching in directions 7 and 19 (spring compression direction)
Accordingly, roller cutters 11A, 11B and 11
The cutting edges of the blades C and 11D protrude from the slits 39A, 39B and 39C, 39D of the pipe guides 23 and 25 toward the pipe. Note that when the pipe guides 23, 25 do not hold the pipe 20, the springs 45, 47 cause the pipe guides 23, 25 to hold the corresponding pins 17, 19.
Therefore, as shown in FIG. 1, the cutting edges of each roller cutter 11A to 11D move radially outward relative to the inner peripheral portions 27, 29 of the pipe guide (FIG. 2). The cutting edge is protected by this pipe guide, and when the pipe cutter is not in use, it is held in a safe position without protruding from the inner circumference.

Note that the connection between the spring 45 or 47 and the flat surface 35 or 37, or the support base 41 or 4
Regarding the connection with 3, it may be fixed by brazing, for example, or it may be made detachable so that it can be replaced with another pipe guide (not shown), depending on the application. It may also be possible to grip pipes of different diameters (not shown).

In FIG. 1, on the right side of the joint part 5, the support arms 1 and 3 are rotated to open the respective jaw parts 7 and 9.
It shows the mechanism that makes it possible to approach and leave the
In this embodiment, the end of the support arm 1 is provided with a notching feed mechanism 50 shown in a partially sectional view. This increment feeding mechanism 50 includes a handle 51 and an end surface 5 of the handle 51.
3, a shaft 55 extending substantially parallel to the longitudinal axis 60 of the pipe cutter, a claw plate 59 swingable about the pin 57, and a spring 61 attached to the end of the claw plate 59 to constantly pull the claw plate 59 clockwise.
It consists of The shaft 55 has a sawtooth portion 65 approximately in the center thereof that fits into a shaft fitting hole 63 formed at the end of the support arm 1, and the sawtooth portion 65 engages with the claw plate 59. The shaft 55 has its head 6
At 7, it contacts a sliding surface 69 formed at the end of the other support arm 3. This sliding surface 69 is the shaft 55
When the support arm 3 moves to the left in the figure, the point of contact with the head 67 on the sliding surface 69 moves to the upper left, thereby rotating the support arm 3 clockwise about the joint portion 5.

Naturally, the notch feed mechanism 50 is not limited to this embodiment, and may be, for example, a normal screw feed mechanism (not shown).

The procedure for cutting a pipe using the pipe cutter 10 configured as described above and its operation will be explained with reference to FIG. 1.

First cut the pipe (not shown) with the pipe cutter 1.
0, rotate the claw plate 59 counterclockwise to release the engagement between the claw plate 59 and the sawtooth portion 65, and move the shaft 55 to the right using the handle 51.

As a result, the shaft head 67 and the sliding surface 69 are no longer in contact with each other, and the support arm 3 becomes freely rotatable around the joint portion 5. When the support arm 3 is rotated counterclockwise and the jaws 7 and 9 of each support arm 1 and 3 are separated, the pipe guide 23 is rotated in synchronization with this.
and 25 are separated from each other, making it possible to guide the pipe 20 into the pipe guide inner peripheral portions 27 and 29 from the direction of arrow A in the figure. Next, when the support arm 3 is rotated clockwise, the gap between the pipe 20 and the pipe guides 23 and 25 is reduced.

As described above, the pipe guides 23 and 25 in this embodiment have inner circumferential parts 27 and 29 that are approximately half of the entire circumference of the pipe 20, so the end surfaces 31 and 33 of the opposed pipe guides 23 and 25 are You can get close enough to touch. In this way, when the support arm 3 continues to rotate clockwise after contacting the pipe guide, the jaws 7 and 9 move closer to each other independently of the pipe guides 23 and 25, which have stopped approaching. roller cutter 11
A, 11B, 11C and 11D approach via the cutter supports 13 and 15 (springs 45 and 47 are in a compressed state), and finally the slits 39A,
39B, 39C, and 39D, and protrude inward from the pipe guide inner peripheral portions 27 and 29 to come into contact with the pipe 20. At this time, the shaft 55 of the notching feed mechanism 50 provided at the end of the support arm 1 is moved to the left, and its head 37 is brought into contact with the sliding surface 69 of the support arm 3. Incidentally, the increment feeding mechanism 50 is
Sawtooth portion 65 that prevents the shaft 55 from moving in the right direction
At this time, the spring 45
and 47, the jaws 7 and 9 do not separate.

Regarding pipe cutting, in the above state, the rotation of the pipe 20 is further restrained, and the entire pipe cutter 10 is rotated clockwise and counterclockwise around the pipe 20, while the shaft 55 is moved to the left every pitch of the sawtooth. By doing so, the roller cutters 11A, 11B, 11C, and 11D protrude further inward, and the pipe 20 is finally cut. At this time, pipe guides 23 and 2
5 holds the outer circumferential surface of the pipe 20 while sliding on the outer circumferential surface of the pipe 20 in synchronization with the rotation of the pipe cutter 10, so that the pipe 20 does not deform during cutting.

The pipe cutter 10 according to this embodiment is equipped with four roller cutters serving as cutting means, and the arrangement structure is such that when the opposed pipe guides come into contact, one roller cutter is at an angle of approximately 90 degrees with the other adjacent roller cutter. Because the rotation angle of the pipe cutter body required to cut the pipe is the same as that of a conventional pipe cutter equipped with one or two cutting means (more than 360 degrees or 180 degrees),
degree or more), only a small rotation degree is required, and the value should be around 90 to 100 degrees. That is, this also improves the operability of the pipe cutter itself.

In addition, regarding the pipe holding mechanism, conventional pipe cutters have point support or line support for the pipe, whereas the pipe cutter according to the present invention uses a pipe guide having an inner circumferential portion with a curvature approximately equal to the outer diameter of the pipe. This provides stable pipe holding through surface support, so the cut end of the pipe will not be deformed, and in addition, the beginning and end of each cut by each roller cutter are aligned, and the pipe is aligned in the longitudinal direction of the pipe. It does not progress in a spiral manner.

[Brief explanation of the drawing]

FIG. 1 is a front view of the pipe cutter according to the present invention; FIG. 2 is an external perspective view of a pipe guide included in the pipe cutter; FIG. 3 is an external view of the pipe cutter as viewed from the direction of arrow A in FIG. 1. 1, 3...Support arm, 10...Pipe cutter,
11A, B, C, D...Roller cutter (pipe cutting means), 20...Pipe, 23, 25...Pipe guide (pipe holding means).

Claims (1)

[Scope of utility model registration request] A cutter support is pivotally connected to each of a pair of support arms, which are attached so as to be able to approach and separate from each other, so as to face each other.
Pipe guides having an inner circumferential portion with a curvature approximately equal to the outer diameter of the pipe to be cut are elastically attached to each of the cutter support stands, and a plurality of roller cutters are mounted on each of the cutter support stands, respectively. A rotatably mounted pipe cutter, in which the cutting edge of each roller cutter is positioned radially outward of the inner peripheral portion of the pipe guide that is not in a pipe holding state, and all of the roller cutters mounted on each cutter support stand are A pipe cutter characterized by being positioned within the same plane.