WO2001058634A1

WO2001058634A1 - Pipe cutter

Info

Publication number: WO2001058634A1
Application number: PCT/JP2000/000798
Authority: WO
Inventors: Eiki Tamaoki; Daisuke Yamada
Original assignee: Rex Industries Co., Ltd.
Priority date: 2000-02-14
Filing date: 2000-02-14
Publication date: 2001-08-16

Abstract

A pipe cutter, comprising a plurality of rotatable rollers (13) which are arranged on two shafts parallell with each other and support a pipe to be cut and an abacus bead-shaped cutter (15) which cuts the pipe supported by the rollers (13) by pressing it while rotating, wherein a roller bearing is used as at least one of the bearings of the roller (13) and the cutter (15), whereby a smaller force is needed for cutting the pipe to be cut, and also the deformation of the pipe and the occurrence of burrs can be reduced.

Description

Description Pipe cutter Technical field

The present invention relates to a pipe cutter used for cutting a steel pipe, a copper pipe, a brass pipe, a resin pipe, or the like used for a water pipe, a gas pipe, an air conditioner, and the like. For details, improve the pipe cutter that holds the pipe to be cut between the mouthpiece provided on the main body and the roughly abacus ball-shaped power cutter, and cuts the pipe with a cut while rotating the main body around the pipe. About. Background art

'Figure 5 shows an example of a conventional pipe cutter. As shown in the figure, two substantially parallel shafts 2 and 3 'are provided at the lower portion of a substantially C-shaped main body 1, and a plurality of rollers 14 are provided on the two shafts 2 and 3, respectively. Is rotatably supported. A cutter holder 6 that moves up and down by the rotation of the grip 5 is provided at the upper part of the main body 1, and a roughly abacus ball-shaped power cutter 7 can be rotated by a shaft 8 at the tip of the cutter holder 6. It is pivotally supported.

Then, when cutting the pipe with this pipe cutter, hold the pipe to be cut with a vice or hand, rotate the grip 5 so that the cutter 7 is located at the cutting location, and rotate it with the roller 4. By holding the pipe to be cut by the cutter 7 and rotating the main body 1 around the pipe while rotating the grip 5 little by little, the cutter 7 gradually cuts into the pipe and cuts while forming a groove. . Disclosure of the invention In the conventional pipe cutter as described above, both the roller 4 and the shafts 2 and 3 supporting the roller 14 and the cutter 7 and the shaft 8 supporting the cutter 7 are connected together. The load is supported by flat bearings. For this reason, when a load is applied to the rollers 14 and the force cutters 17 when cutting the pipe, the frictional force with the shaft increases, and a large force is required to rotate the main body around the pipe to be cut. Therefore, the burden on the worker and the work time are increased. Also, if the friction of the bearing of the cutter is large, the cutter blade will bend over the pipe and the pressing force on the pipe will be large, causing the pipe to deform, generating burrs, and increasing the diameter of the small opening. Also occurs. Deformation of this pipe, generation of burrs, and reduction of small diameter are particularly remarkable in thin and soft pipes such as copper pipes.

The present invention has been made in consideration of the above-mentioned conventional problems, and can reduce the force for holding the pipe to be cut when cutting the pipe to be cut, the burden on an operator, and the cutting time as compared with the related art, and can reduce the deformation of the pipe and the burr. The aim is to realize a pipe cutter that can reduce the occurrence of small diameters and small diameters.

According to the present invention, a plurality of rotatable rollers 113 supported on a pipe to be cut and arranged on two parallel axes and a pipe to be cut supported by the rollers 113 are pressed and cut while rotating. In a pipe cutter having an abacus ball-shaped force 15, a rolling bearing is used for at least one of the roller 13 and the cutter 15. Further, it is preferable that the rolling bearing is a ball bearing or a roller bearing. Further, it is preferable that the port 13 is the rolling bearing itself.

By adopting this configuration, the force for holding the pipe to be cut when cutting the pipe to be cut, the burden on the operator, and the cutting time can be reduced as compared with the past, and the pipe is deformed, burrs are generated, and It is possible to obtain a pipe cutter that can reduce the diameter reduction. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a view showing an embodiment of the present invention, in which (a) is a perspective view, (b) is a view taken in the direction of arrow Z in (a),

FIGS. 2A and 2B are assembly views showing an embodiment of the present invention, in which FIG. 2A is a front view, FIG. 2B is a cross-sectional view taken along line b—b in FIG.

FIG. 3 is an exploded perspective view showing a main body according to the embodiment of the present invention, wherein (a) shows a left main body, and (b) shows a right main body.

FIG. 4 is a view showing a cutter, a cutter holder, and a feed screw according to the embodiment of the present invention; and

FIG. 5 is a diagram showing an example of a conventional pipe cutter. BEST MODE FOR CARRYING OUT THE INVENTION

1 and 2 are views showing an embodiment of a pipe cutter according to the present invention. FIG. 1 (a) is an assembled perspective view, FIG. 1 (b) is a view taken in the direction of arrow Z in FIG. 1 (a), and FIG. 2 (a) is an assembly front view, FIG. 2 (b) is a cross-sectional view taken along line b—b of FIG. 2 (a), FIG. 3 is an exploded perspective view of the main body, and FIG. It is a figure which shows a holder, and a feed screw.

In this embodiment, as shown in FIG. 1, two parallel shafts 11 and 12 are provided inside one end of a C-shaped main body 10, and the shafts 11 and 12 are respectively provided. A plurality of rollers 13 and a spacer 14 are provided. A substantially abacus ball-shaped cutter .15 is provided inside the other end of the main body 10 by a grip 16 so as to be movable.

The present embodiment will be further described with reference to FIGS. 2 to 4. The C-shaped main body 10 is symmetrical from the center line (line b-b in FIG. 2A) to the right and left as shown in FIG. It is divided into two parts, a main body 10A and a left main body 10B, and is formed by aluminum die casting or the like.

Each of the right body 1 OA and the left body 10 B has a C-shaped The shaft holes 1 la and 12 a for one roller are drilled at one end of the portion, and the other end of the C-shaped portion has a square groove 17 (for this purpose) in which a holder 1 described later is slidably received. The square groove becomes a square hole when the right main body 10A and the left main body 10B are connected.), And a step portion 1 serving as an escape portion so as not to be obstructed when the cutter moves to both sides thereof. 7a is formed. A cylindrical portion 18 for grip support is formed extending from the other end of the C-shaped portion. Reference numeral 19 denotes a hole for inserting a positioning pin when connecting the left and right main bodies 10A and 10B, and 20 denotes a screw hole for connection. Also, as shown in FIG. 4 (a), the cross section of the cutter 15 has a substantially abacus ball shape, and a rolling bearing 21 is press-fitted as the bearing. Note that a ball bearing or a roller bearing can be used for the rolling bearing, but it is preferable to use a roller bearing in view of load capacity. The cutter 15 is rotatably supported by a cutter holder 23 via a rolling bearing 21 and a shaft 22 as shown in FIG.

The cut-out holder 23 has a rectangular cross section and is slidably inserted into the square groove 17 of the main body 10, and a screw hole 23 a is formed at the center thereof. A feed screw 24 shown in FIG. 4 (c) is rotatably screwed into the screw hole 23a.

The feed screw 24 has a grip mounting boss 24a having two surfaces and two flanges 24b, 24c provided at one end of the screw 24d. It is preferable that the screw 24 d of the feed screw 24 and the screw hole 23 a of the force holder 23 are left-handed screws. This is because it is convenient for the feeding operation. That is, the cut is fed by the clockwise rotation of the grip.

Then, the above members are assembled as shown in FIG. That is, the cutter holder 23 supporting the cutter 15 with 轴 22 is inserted into the square hole 17 of the right main body 10 A, and the feed screw threaded into the cutter holder 23 is inserted. The screw 24 is fitted into the bearing hole 25 on the upper part of the cylindrical part of the right body 10 between the two flanges 24 b and 24 c. Further, a plurality of rollers 13 and spacers 14 are arranged at predetermined positions by shafts 11 and 12.

Although a rolling bearing is used as the bearing of the roller 13, in the present embodiment, the rolling bearing itself is used as the roller. Further, as the rolling bearing, a ball bearing or a roller bearing can be used, but it is preferable to use a roller bearing from the viewpoint of load capacity as in the case of the power turret.

In this embodiment, as shown in Fig. 2 (a), three shafts are used for one shaft, but the outer shafts on both sides mainly support the pipe to be cut stably. However, the inner one mainly supports the pressing force of the cutter.

The right main body 1 OA on which the respective members are assembled as described above, the left main body 10 B is overlapped, the cylindrical portion 18 thereof is tightened by the ring 26, and the lower portion is screwed through the screw hole 20. Is done. Thereafter, the grip 16 is fitted to the boss 24 a of the feed screw 24, and is fixed by the screw 27.

In the present embodiment configured as described above, the cut pipe is held by a vise or a hand, and the cut pipe is positioned so that the cut 15 is positioned at the cut position of the pipe. Hold the body 10 by hand and rotate it around the pipe while tightening the grip 16 gradually, so that the wedge shape of the cutter 15 is obtained. The tip can be cut into the pipe and a circumferential groove can be formed to cut the pipe.

In this case, since the rolling bearings are used for the bearings of the rollers 13 and the cutter 15, the resistance of the bearings is reduced from the sliding resistance of the conventional flat bearing to the rolling resistance. Required cutting torque Decrease compared to the past. Therefore, the force for holding the pipe to be cut is small. Also, the deformation (roundness) of the pipe to be cut and the small diameter of the small opening are small, and the occurrence of burrs is reduced, and the cutting time is shorter, and the life of the cutter is longer. According to the actual example, the roundness is improved by 50% as compared with the conventional one, the burr generation is less than 1/2 of the conventional one, and the life of the cutter is reduced.

The cutting time was reduced by about 3 times, and the cutting time was reduced by about 30%. In the embodiment described above, rolling bearings are used for the bearings of both the roller and the force turret. However, either one may be used, and in that case, a roller having a small outer diameter is used. It is effective when used. '

Industrial applicability

ADVANTAGE OF THE INVENTION According to the pipe cutter of this invention, the use of a rolling bearing for at least one, and preferably both of the bearings of the mouth which supports the pipe to be cut and the cutter of the cutter which cuts the pipe, as compared with the conventional ones. Thus, the force for holding the pipe when cutting the pipe and the burden on the operator can be reduced, and the deformation of the pipe, generation of burrs, reduction of the diameter of the small mouth, cutting time, and the like can be reduced.

Claims

The scope of the claims

1. A plurality of rotatable rollers (13) that are arranged on two parallel axes and support a pipe to be cut, and a pipe to be cut supported by the roller (13) are pressed while rotating. In a pipe cutter equipped with an abacus ball-shaped force cutter (15) for cutting,

A pipe cutter characterized by using a rolling bearing for at least one of the rollers (13) and (15).

2. The pipe cutter according to claim 1, wherein the rolling bearing is a ball bearing or a roller bearing.

3. The pipe cutter according to claim 1, wherein the roller (13) is the rolling bearing itself.