JPH0645291Y2 - Portable cutter for cutting pipes - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention is a portable device for cutting unnecessary protruding portions or required portions of drainage or water supply pipes arranged in a narrow space such as a building or a gutter. Electric cutter

(Prior Art) A drainage pipe or water supply pipe 1 made of a synthetic resin such as vinyl chloride, which is buried in a floor or wall of a building, has a wall 2 as shown in FIG.
It is installed in a very narrow place such as a corner of the building, and cuts these drain pipes flush with the floor surface 3 or at a position slightly deeper than that, for the required drainage or water supply in the kitchen, washroom, bath or toilet. Although it is connected to a device, a band saw or the like having a narrower width than before has been used to cut the protruding portion 5 of the drainage groove 4 and the like as shown by the phantom line in FIG. For this reason, the cutting work is very impossible and it is often difficult to obtain an accurate cut surface.

The applicant of the present invention for solving such a problem is
A portable cutter for cutting pipes as shown in Japanese Utility Model Publication No. 62-144114 was first proposed.

This cutter has a drive shaft holding sleeve loosely fitted on the outer circumference of the drive shaft connected to the drive source inside the cutter body, and has a guide disk at the tip of the drive shaft and a disk shape that is larger than this and overlaps on the tip side. The cutting blade and the cutting blade are detachably fixed. According to this, the drive shaft of the cutter body with the built-in drive source is directly inserted into the pipe to be cut and provided at its tip. Since it is intended to cut from inside the pipe with a disc-shaped cutting blade, it is possible to cut easily and efficiently if there is a gap where the drive shaft can be inserted into the pipe in any narrow place. You can

(Problems to be Solved by the Invention) In the cutter as described above, the sleeve is simply loosely fitted to the drive shaft, and therefore the sleeve is in frictional contact with the rotationally driven drive shaft during use. Therefore, the cutter user must firmly grip the sleeve so that it does not rotate with the drive shaft, and the friction with the drive shaft causes the sleeve to reach a temperature that is too high for the user to grip. It may be heated, and since the long drive shaft is supported for the pipe to be cut only by the guide disc provided at the tip of the drive shaft together with the cutting blade, the cutting work is in progress. In addition, it is difficult to hold the drive shaft parallel to the pipe to be cut, which makes it difficult to perform accurate cutting.

The present invention solves such a problem.

(Means for Solving the Problems) In the portable cutter for cutting a pipe of the present invention, a long length of a drive shaft connected to a drive source in the cutter body is fitted with a support sleeve having a length substantially over its entire length. The bearings provided at both ends in the axial direction rotatably support the drive shaft on the support sleeve, and a guide disk for supporting and guiding the inner peripheral surface of the pipe to be cut is provided at the tip of the drive shaft. A large disc-shaped cutting blade is fixed to the tip side thereof, and a supporting base plate having a supporting surface for supporting and guiding the protruding end surface of the pipe to be cut is fixed to the sleeve so as to be axially movable and adjustable. A configuration is adopted in which a guide roller for supporting and guiding the outer peripheral surface of the pipe to be cut is provided on the support base plate.

In the above configuration, the guide disc, the cutting blade, and the guide roller can be replaced with those having a required diameter so that they can be attached.

(Operation) The support base plate on the support sleeve is adjusted and fixed so that the axial length from the cutting blade at the tip of the drive shaft to the support surface of the support base plate becomes the cutting length of the pipe to be cut. Then, hold the cutter body with one hand and insert the drive shaft into the pipe to be cut, hold the required part of the support sleeve that is free to rotate with respect to the drive shaft with the other hand, and hold the support surface of the support base plate. The guide roller is brought into contact with the protruding end surface of the pipe to be cut, the guide roller is brought into contact with the outer peripheral face of the pipe to be cut, the cutting blade is brought into contact with the inner peripheral face of the pipe to be cut, and the drive shaft is rotated in such a state. Meanwhile, the cutting blade is cut to the outside in the thickness direction of the pipe to be cut to a position where the guide disk contacts the inner peripheral surface of the pipe to be cut.
Then, when the guide disc comes into contact with the inner peripheral surface, the cutting blade finishes cutting in the thickness direction, and then the other hand holding the support sleeve continuously attracts the guide roller to the outer peripheral surface of the pipe to be cut and guides it. The pipe to be cut is accurately cut at the desired cutting position by moving the disc in the circumferential direction while operating the support sleeve so as to press the disc against its inner peripheral surface.

In the cutting operation as described above, the support guide of the drive shaft with respect to the pipe to be cut is the guide disc on the inner peripheral surface of the pipe to be cut and the guide roller on the side of the support base plate on the outer peripheral surface and the pipe to be cut. The support sleeve is made up of three members, which are in contact with the projecting end face, and the support surface of the support base plate. On the other hand, the support sleeve is free to rotate with respect to the drive shaft due to the bearing interposed between the support sleeve and the drive shaft. The support sleeve is not heated during rotation and does not rotate with the drive shaft.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2. The cutter body 10 has an electric motor (not shown) as an internal drive source and a chuck 10a, like the drill body of an electric drill. , Switch 10b, handle 10c, wiring 10d, etc.,
A chuck 10a extending from a driving source is detachably connected to a long driving shaft 11.

The drive shaft 11 is fitted with a pipe-shaped support thru 12 having a length substantially over its entire length, and a bearing interposed between the drive shaft 11 and the support sleeve 12 in the axial direction. The support sleeve 12 is rotatably supported on the drive shaft 11 by 13,13. As shown in FIG. 2, the tip of the drive shaft 11 has a slightly smaller diameter through the mounting step 11a.
1b, a synthetic resin guide disc 14 is fitted to and abutted against the mounting step 11a, and a disc-shaped cutting blade 15 such as a circular saw having a diameter larger than that of the guide disc 14 is attached to the tip side of the guide disc 14. Are fitted so that they overlap with each other, and the nut 16 with a washer and the lock nut 17 are screwed into the threaded portion 11c of the small diameter shaft portion 11b, whereby the guide disc 14 and the disc-shaped cutting blade 15 are connected to the drive shaft 11. It is fixed to rotate integrally. Note that the base end portion (upper end portion) side of the support sleeve 12 is knurled to prevent slipping, and this processed portion 12a is normally used as a grip portion.

On the other hand, the support sleeve 12 includes a support base plate 18 having a thick disk shape.
Is axially slidably inserted through a sleeve insertion hole 19 penetrating the disc-shaped support base plate 18 at an eccentric position, and the support base plate 18 is supported by a base plate fixing screw tool 20 by a support sleeve 12. It can be fixed at any position above. The support base plate 18 has a side surface 18a facing the guide disk 14 and the cutting blade 15, for example, a protruding portion 5 of the water supply pipe 1 to be cut.
Support surface 18a for supporting and guiding the protruding end surface 6 of (the pipe to be cut)
And a pair of guide rollers 21, 21 for supporting and guiding the outer peripheral surface of the pipe projecting portion 5 on the supporting surface 18a.
But the central axis of the sleeve through hole 19 (not shown, located on the same axis as the central axis line l ₀ of the drive shaft 11 to be described later) is pivotally attached from equidistant. Each guide roller 21 includes a roller main body 21a made of metal or synthetic resin, and a support shaft 21b rotatably supporting the roller main body 21a and detachably screwed to the support base plate 18.

Next, a usage mode of the portable cutter for cutting a pipe having the above-described configuration will be described.

First, loosen the base plate fixing screw 20 that fixes the support base plate 18 on the support sleeve 12, and the axial length from the cutting blade 15 to the support surface 18a of the support base plate 18 is the pipe protrusion to be cut. Support base plate 18 so that the cut length L of the portion (pipe to be cut) 5
After slide adjustment, the screw tool 20 is tightened to fix the support base plate 18.

Then, hold the cutter body 10 with one hand and drive shaft 11
Side is inserted into the pipe projecting portion 5, and the upper end grip portion 12a of the support sleeve 12 is held by the other hand, and the support surface 18a of the support base plate 18 is
Is brought into contact with the projecting end surface 6 of the pipe projecting portion 5, the guide rollers 21, 21 are brought into contact with the outer peripheral surface 7 of the pipe projecting portion 5, and further the cutting blade 15 is brought into contact with the inner peripheral surface 8 of the pipe projecting portion. While rotating the drive shaft 11 in such a state,
The cutting blade 15 is cut in the thickness direction of the pipe to a position where the guide disk 14 slides on the inner peripheral surface 8 of the pipe protruding portion 5. When the guide disk 14 comes into contact with the inner peripheral surface 8, the cutting blade 15 does not further project to the outside. After that, by operating the other hand holding the support sleeve 12, that is, the other hand. While operating the support sleeve 12 so that the guide rollers 21, 21 are attracted to the outer peripheral surface 7 side of the pipe projecting portion 5 and the guide disc 14 is pressed against the inner peripheral surface 8 side thereof, The pipe projecting portion 5 can be easily cut by moving the pipe protruding portion 5 to.

In the above cutting operation, the cutting blade 15 must always be positioned at a right angle to the pipe projecting portion 5, in other words, the drive shaft 11 must always be located parallel to the pipe projecting portion 5. Guide rollers 21 provided on the support base plate 18
It is necessary to set the distance R between the outer peripheral surface of the drive shaft 11 and the central axis l ₀ of the drive shaft 11 to be substantially equal to the length r of the guide disc 14 plus the wall thickness t of the pipe 1. .

If the pipe 1 to be cut next is thicker than the wall thickness of the pipe 1 cut earlier, the guide disc 14 should be used as it is and the cutting blade 15 should be replaced with one having a larger diameter. Alternatively, the cutting blade 15 may be left as it is and the guide disc 14 may be replaced with a smaller diameter one, but if the guide disc 14 is replaced with a smaller diameter one like the latter, As for the roller 21, it is necessary to replace the roller body 21a so that the diameter of the guide disk 14 becomes smaller and the diameter of the roller becomes larger.

In this embodiment, two guide rollers 21 are provided on the support base plate 18, but the number of guide rollers 21 may be one. Although the support base plate 18 is eccentrically attached to the support sleeve 12, the support base plate 18 may be attached concentrically with the support sleeve 12. However,
In the case of the concentric shape, it is necessary to make the diameter of the support base plate 18 larger, and the portion of the support base plate 18 on the side opposite to the guide roller 21 mounting side becomes an extra protruding portion. That is, if it is mounted eccentrically as in the embodiment, the extra protrusion is eliminated and the disc can be effectively used. The support base plate 18 is not limited to such a disc shape, and may be an elliptical, rectangular, polygonal, or other plate-shaped body.

Further, the guide roller 21 is preferably rotatable as in this embodiment, but may be fixed.

(Effect of the Invention) According to the portable cutter for cutting a pipe of the present invention, since the bearings are provided at both axial ends between the drive shaft and the support sleeve, the support sleeve does not heat up during use. Also, the user only has to lightly grip the support sleeve, which makes the work very easy.

Further, the support guide of the drive shaft for the pipe to be cut is composed of a guide disc supporting the inner peripheral surface of the pipe to be cut, a guide roller supporting the outer peripheral surface, and a support surface of a support base plate abutting the protruding end surface. Since it is done by a member, the cutting length of the pipe to be cut can be reliably regulated, and the long drive shaft can be easily held in a position parallel to the axial direction of the pipe to be cut. Therefore, the pipe to be cut can be accurately cut at a predetermined position, and the cut end becomes beautiful. Further, the cutting work can be performed efficiently.

Further, for pipes having different wall thicknesses, the guide disc, the cutting blade, and the guide roller can be appropriately replaced with pipes having different diameters to freely cut the pipes.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a vertical sectional view showing the same use state, and FIG. 3 is a sectional view showing an example of a piping state. 10 …… Cutter body, 11 …… Drive shaft, 12 …… Support sleeve, 13 …… Bearing, 14 …… Guide disc, 15 …… Cutting blade, 18
…… Support base plate, 18a …… Support surface, 21 …… Guide roller.

Claims (2)

[Scope of utility model registration request] 1. A long drive shaft connected to a drive source in a cutter body is fitted with a support sleeve having a length substantially over its entire length, and the drive shaft is provided with bearings provided at both ends in the axial direction. It is rotatably supported by a support sleeve, and a guide disk for supporting and guiding the inner peripheral surface of the pipe to be cut and a disk-shaped cutting blade which is larger than this and overlaps on the tip side of the drive shaft is provided at the tip of the drive shaft. A support base plate having a support surface for supporting and guiding the protruding end face of the pipe to be cut is fixed to the sleeve so as to be movable in the axial direction, and the outer peripheral surface of the pipe to be cut is supported and guided on the support base plate. A pipe cutting portable cutter that is equipped with a guide roller. 2. A pipe cutting portable cutter in which the guide disc, the cutting blade, and the guide roller are detachably attached.