JPH0442150B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a pipe cutting device used for cutting pipes made of vinyl chloride or the like.

BACKGROUND ART As a conventional cutting device of this type, one having a configuration as shown in FIGS. 6 and 7, for example, is known. In this device, a support plate 2 is attached to a frame 1.
The housing 3 is supported so as to be able to move up and down,
It can be set to a predetermined position using the operating body 4. A rotary cutter 5 is installed on the side of the housing 3.
is provided and is rotationally driven by a motor inside the housing 3. A pair of clamping arms 6 are supported on the frame 1 so as to be openable and closable, and an operating body 7
It can be opened and closed by Guide rollers 8 are rotatably supported at the lower end of the frame 1 and at the tips of both clamping arms 6, respectively.

Then, as shown in FIGS. 6 and 7, the guide roller 8
is brought into contact with the outer circumferential surface of the pipe P, and the frame 1 etc. is attached to the outer circumference of the pipe P using both clamping arms 6. In this state, the frame 1 etc. is rotated clockwise in FIG. 7 to remove the pipe P. The pipe P is cut by the rotary cutter 5 by making one revolution around the outer periphery of the pipe P.

However, in this conventional pipe cutting device, the frame 1 and the like are connected to the pipe P while the pipe P is held between the pair of holding arms 6 as described above.
Since the size of the pipe P that can be cut with this cutting device is naturally limited to the diameter that can be held by the holding arm 6, the cutting device is used for cutting pipes of various diameters. I couldn't do it.

Further, in this conventional device, when the pipe P is held between the housing 3, the three guide rollers 8
Because the outer peripheral surface of the pipe P is strongly pressed,
The pipe P deforms into an almost rice ball shape in cross section,
The rotational movement of the frame 1, etc. on the outer circumferential surface of the pipe P is not performed smoothly, and accurate cutting is not performed in a plane perpendicular to the axis of the pipe P, resulting in misalignment of the cut part while going around the pipe. There were defects in which the chamfered portions were not chamfered uniformly to a predetermined amount and wavy undulations were generated in the chamfered portions.

OBJECT OF THE INVENTION The present invention solves the above-mentioned deficiencies in the conventional device, can be easily attached to pipes of various diameters, and can accurately cut those pipes in a plane perpendicular to the axis thereof. The purpose of the present invention is to provide a pipe cutting device that can cut pipes.

Structure of the Invention In order to achieve the above-mentioned object, the present invention provides a chain capable of going around a pipe on one side of a frame that supports a rotary cutter, and a chain that goes around a pipe on the other end of the frame. A locking member is provided on the chain to engage with the free end side of the chain to attach the frame to the outer circumference of the pipe, and the chain is provided with a locking member that rolls on the outer circumference of the pipe to prevent rotational displacement of the frame on the outer circumference of the pipe. It is equipped with a plurality of rollers for guiding.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 5.

Now, in the pipe cutting device of this embodiment, the frame 10 includes a substantially box-shaped outer frame 11 that opens toward the right side, and a cross section that is fitted into the outer frame 11 so as to be vertically movable. U-shaped inner frame 1
It consists of 2. As shown in FIG. 4, a female screw body 13 is fixed within the inner frame body 12, and an engagement protrusion 13a that projects outward through the long hole 14 of the outer frame body 11 is provided on the left side of the body. There is.

A threaded rod 15 is rotatably supported on the outer frame 11 so as to be screwed into the female threaded body 13, and the threaded rod 15 is operated by an operating handle 16 attached to the upper end of the outer frame 11.
By rotating the outer frame body 11, the outer frame body 11 can be adjusted to move vertically relative to the inner frame body 12 via the female screw body 13. Female thread body 1
A fixing screw 17 is screwed into 3 from the right side of the inner frame 12, and by tightening the fixing screw 17, the engagement protrusion 13a of the female threaded body 13 is pulled to the right, and the left outer surface of the outer frame 11 is pulled to the right. The frame bodies 11 and 12 are pressed into engagement with each other, and both frames 11 and 12 are fixed in a predetermined movement adjustment state.

As shown in FIGS. 1 and 3, a motor housing 19 is supported on the left side of the outer frame 11 of the frame 1 via a support plate 18, and is held in place by a support protrusion 20 and a tightening band 21 on the upper part of the motor housing 19. has been done. A rotary cutter 22 is rotatably supported at the lower left side of the housing 19, and has a number of cutting blades 22a on its outer periphery for cutting the pipe P, and has a chamfered cut end surface of the pipe P on its right side. A chamfering cutting edge 22b is provided for this purpose. The rotary cutter 22 is rotatably driven by a motor within the motor housing 19 via a gear transmission mechanism or the like.

As shown in FIGS. 1 to 3, a mounting plate 23 is fixed to the lower right side of the inner frame body 12 of the frame 10. As shown in FIGS. At the center of the lower end of the mounting plate 23, a chain 24 extending downward on the rear side and a support body 25 extending downward on the front side are rotatably attached at their base ends by support pins 26.

The chain 24 is made up of a plurality of pairs of connecting pieces 27 arranged left and right at predetermined intervals, and a plurality of connecting pins 28 that rotatably connect the connecting pieces 27 to each other at their ends. ,
It is designed to be able to go around the pipe P. Each connecting piece 27 is formed into a substantially arcuate side surface so as not to interfere with the outer circumferential surface of the pipe P, and the length gradually becomes shorter from the base end to the free end, and the arrangement interval gradually narrows. It is configured as follows. The support body 25 is composed of a pair of support pieces 29 arranged at a predetermined interval on the left and right sides, and a connecting pin 30 provided between the tips of the support pieces 29. It can be placed in some areas. Rollers 31 are rotatably supported at both left and right ends of the support pin 26 and each of the connecting pins 28 and 30, and are configured to roll on the outer peripheral surface of the pipe P.

As shown in FIGS. 1 to 3 and 5, a pair of left and right support plates 32 are disposed at a predetermined interval between the support pieces 29 of the support body 25 by a plurality of mounting pins 33, and between the upper and front ends thereof. The support block 34 is attached to the shaft 3.
It is rotatably supported by 4a. A locking member 35 is disposed between both support plates 32 with a threaded portion 36 above the locking member 35.
The chain 24 is fitted into the support block 34 so as to be movable up and down.
A hook portion 37 is provided which selectively engages the connecting pin 28 on the free end side. An operating body 38 is rotatably mounted on the support block 34 so as to be screwed into the threaded portion 36 of the locking member 35, and by rotating the operating body 38, the locking member 35 can be moved up and down. By doing this, the chain 24 is connected to the pipe P.
It is designed so that it can be stretched around the outer periphery of the

Next, the operation of the pipe cutting device configured as described above will be explained.

Now, when using this cutting device to cut a pipe P of a predetermined diameter, the pipe P is arranged in a substantially horizontal state, and the frame 10 of the cutting device is attached to the pipe P.
At the same time, the chain 24 is placed on the upper outer circumference of the pipe P, and an arbitrary connecting pin 28 on the free end side of the chain 24 is selectively engaged with the hook portion 37 of the locking member 35 according to the diameter of the pipe P. let Then, after moving the frame 10 in the axial direction of the pipe P and aligning the rotary cutter 22 with a predetermined cutting position of the pipe P, the operating body 38 is rotated to remove the locking member 3.
5 is moved upward, the chain 24 is stretched over the outer circumference of the pipe P, and the frame 10 and the like are attached to the outer circumference of the pipe P, regardless of the diameter of the pipe.

When a motor (not shown) is started in this state, the rotary cutter 22 is rotated via a gear transmission mechanism or the like. Thereafter, when the fixing screw 17 is loosened and the threaded rod 15 is rotated by the operating handle 16, the outer frame 11 is moved downward relative to the inner frame 12 via the female threaded body 13, and the outer frame 11 The rotary cutter 22 supported by the pipe P
is moved toward the center of the pipe P, and a part of the pipe P is cut as shown in FIGS. 1 to 3. When the depth of cut of the pipe P becomes appropriate, tightening the fixing screw 17 causes the engagement protrusion 13 of the female threaded body 13 to
a is drawn to the right in FIG. 4 and press-fits into engagement with the left outer surface of the outer frame 11, and both frames 11 and 12 are fixed in a predetermined movement adjustment state, and the rotary cutter 22 is in a predetermined position. Retained.

After that, when the motor housing 19 etc. are grasped and the frame 10 is rotated clockwise in FIG. 3,
Due to the guiding action of a large number of rollers 31 provided on the chain 24 etc., the frame 10 etc. are smoothly rotated at a predetermined cutting position of the pipe P. By making the frame 10 go around the outer circumference of the pipe P in this manner, the pipe P is accurately cut by the outer peripheral cutting edge 22a of the rotary cutter 22 in a plane perpendicular to its axis, and the chamfering cutting edge 22b
At this step, the cut end surface of the pipe P is chamfered uniformly by a predetermined amount.

Next, a second embodiment of the present invention will be described only with respect to the differences from the first embodiment.

The frame 40 includes a pair of opposing support plates 41 each having a substantially semi-elliptical shape, and connecting shafts 42, 43, 4 that connect the support plates 41 with a space maintained between them.
4, and rollers 46 that roll on the pipe P are provided on the connecting shafts 44 at both ends of the support plate 41. A connecting shaft 42 connects both support plates 41 as shown in FIG. A mounting plate 47 is rotatably supported at the base end of one connecting shaft 43, and a motor housing 48 containing a motor is fixed to the mounting plate 47. , outer peripheral cutting edge 22a and chamfering edge 22b
The rotary cutter 22 is moved toward and away from the axis of the pipe P. 48a is a handle fixed to the outer periphery of the motor housing 48.

Each of the support plates 41 has a long hole 49 (only one shown) located on an arc centered on the connecting shaft 43. And the mounting plate 47
A tightening screw 50 is rotatably attached to the tip of the hole 49, and the tightening screw 50 is inserted through one long hole 49.
By rotating the handle 51 of 0, the mounting plate 47
The support plate 41 is tightened between the support plate 41 and the plate-like portion 52 at the tip of the tightening screw 50. In addition, a regulating body 5 is installed in the other elongated hole.
4 is attached, and the regulating body 54 is attached to the support plate 4.
The handle 57 of the tightening screw 56 consists of an L-shaped regulating piece 55 located on the inner side of the clamping screw 55 and a tightening screw 56 inserted through a long hole and located on the opposite side of the regulating piece.
By tightening, the support plate 41 can be tightened between the regulating piece 55 and the collar 58 of the tightening screw 56, and the regulating body 54 can be fixed at an arbitrary position. The regulating piece 55 of the regulating body 54 is for receiving the handle 48a of the motor housing 48 and regulating further rotation of the motor housing 48 and the rotary cutter 22.

A locking member 35 that locks the tip of the chain 24 is supported by a support plate 32 in the same configuration as in the first embodiment, but the support plate 32 is connected to one end of the frame 40 via a link 59. connected.

Further, a string (or a belt) 62 is attached to the connecting piece 60 at the tip of the chain 24 via a fitting 61, and a hook 64 is provided at the tip of the string 62 via a coil spring 63.

Note that a cover 66 covering the rotary cutter 22
has a chip discharge port 67 and a protective plate 65
is fixed.

Now, in order to use the cutting device of this second embodiment, the whole is attached to the pipe P in the same manner as in the first embodiment, and after rotating the motor, the tightening screw 5
0 and rotate the rotary cutter 22 together with the motor housing 48 and the mounting plate 47 about the shaft 43 to cut into the pipe P. Then, when the depth of cut becomes appropriate, that is, when the peripheral cutting edge 22a cuts the pipe P and the chamfering blade 22b becomes able to chamfer an appropriate amount, tighten the tightening screw 50 and 48 etc. are fixed to the support plate 41. Before or after this operation, the regulating body 54 is moved to an appropriate position and fixed, and when the cut by the rotary cutter 22 is about to become too deep, the motor housing 48 is attached to the regulating body 54.
handle 48a to prevent this. The rest of the work is the same as in the first embodiment, and of course the operation and effect are the same as in the first embodiment. In addition, in this second embodiment, the string 62 is used for the following purposes. First, if the pipe P is in a low position and it is difficult to wrap the chain 24 over it, first turn the string 62 from the bottom of the pipe P and pull the string 62.
The chain 24 can be easily arranged around the pipe P. Further, when transporting or storing this cutting device, if the entire cutting device is folded into a small size, then a string 62 is wrapped around it and tied with a hook 64, the entire device remains compact, which is convenient for handling.

It should be noted that the present invention is not limited to the configuration of the above-mentioned embodiments, and the configuration of each part can be arbitrarily changed and embodied without departing from the spirit of the invention.

Effects of the Invention As detailed above, the present invention has an excellent advantage in that it can be easily attached to pipes of various diameters and can be cut accurately in a plane perpendicular to the axis of the pipe. be effective.

[Brief explanation of drawings]

FIG. 1 is a front view showing a pipe cutting device according to a first embodiment embodying the present invention, FIG. 2 is a right side view, FIG. 3 is a left side view, and FIG. 4 is a first embodiment of the pipe cutting device.
Fig. 5 is a partially enlarged sectional view taken along line A-A in Fig. 1, Fig. 6 is a front view showing the conventional device, and Fig. 7 is a partially enlarged sectional view taken along line B-B in Fig. 1. The left side view, FIG. 8 is a front view of the second embodiment, and FIG. 9 is a side view. 10 and 40 are frames, 22 is a rotating cutter,
24 is a chain, 25 is a support, 31 is a roller,
35 is a locking member.

Claims (1)

[Claims] 1. A frame 10 supporting a rotary cutter 22,
Chain 24 that can go around the pipe P on one side of 40
At the same time, a locking member 35 is provided on the other side of the frame 10 for engaging the free end side of the chain 24 surrounding the pipe P to attach the frames 10, 40 to the outer periphery of the pipe P. chain 2
4 is provided with a plurality of rollers 31 that roll on the outer circumferential surface of the pipe P to guide rotational displacement of the frame P on the outer circumferential surface of the pipe. 2. The rotary cutter 22 has a chamfering cutting edge 22b on one side thereof.
Cutting device for pipes as described in section. 3. The pipe cutting device according to claim 1 or 2, wherein the rotary cutter 22 is supported on the frame 10 so as to be movable and adjustable in the radial direction of the pipe P. 4. The length of the chain 24 can be adjusted by selectively engaging a locking member 35 with a plurality of connecting pins 28 on the free end side according to the diameter of the pipe P. A pipe cutting device according to any one of items 1 to 3. 5. The locking member 35 is attached to the frame 10 so as to be movable and adjustable, and by adjusting the movement while engaged with the free end side of the chain 24, the chain 24 can be stretched around the outer periphery of the pipe P. A pipe cutting device according to any one of claims 1 to 4.