JPH05345300A - Drilling tool - Google Patents

Abstract

PURPOSE:To drill different diametrical circular holes by using a single tool. CONSTITUTION:On a case main body 2, a central shaft 3 to be inserted into a hole previously formed in the center of a circular hole and a groove cutting cutter 4 to drill the circular hole on a plate body with revolution around the central shaft 3 as its center with a distance of radius length of the circular hole from the center of the central shaft 3 and in parallel with the central shaft 3 and by rotating by an electric motor M are provided, and simultaneously, a position changing means 5 varying distance from the groove cutting cutter 4 of the central shaft 3 is furnished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching tool capable of punching circular holes having different diameters in a plate such as a wall material or a ceiling material.

[0002]

2. Description of the Related Art Conventionally, as a cutting tool for forming a circular hole for wiring, piping, etc. in a plate member such as a wall material or a ceiling material, there has been a hole saw attached to a portable electric drill.

[0003]

However, in such a hole saw, in order to form circular holes having many different diameters, it is necessary to prepare many kinds of hole saws according to the diameters of the circular holes, which is troublesome. In addition, there is no hole saw having a large-diameter circular hole with a diameter of more than 100 mm, and there is a problem to be solved such that the diameter of the circular hole is restricted.

According to the present invention, the diameter of the circular hole can be freely adjusted,
Moreover, it is an object of the present invention to provide a perforating tool that can solve the above-mentioned problems by allowing a circular hole having a large diameter to be formed.

[0005]

SUMMARY OF THE INVENTION The present invention is a punching tool capable of punching a circular hole in a plate body, the center shaft being inserted into a hole formed in the center of the circular hole in the case body in advance. , And the hole is drilled in the plate body while being rotated about the center axis by being rotated by an electric motor in parallel with the center axis and at a distance of the radial length of the circle hole from the center of the center axis. And a position changing means for changing the distance of the center shaft from the groove cutting cutter.

[0006]

[Function] A center shaft is inserted into a preformed hole in a plate body, and the case body is manually rotated about the center shaft while the peripheral edge of the circular hole is opened by a grooving cutter so that a circular shape can be efficiently formed. Holes can be drilled.

Further, the punching tool is provided with a position changing means for varying the distance of the center shaft from the groove cutting cutter. Therefore, by adjusting the distance between the center shaft and the grooving cutter according to the diameter of the circular hole, circular holes of different diameters can be drilled, so there is no need to prepare many types of hole saws. It is possible to improve the productivity and reduce the cost.

Further, by setting a long distance between the center shaft and the groove cutting cutter, it becomes possible to form a circular hole having a large diameter which cannot be achieved by the conventional hole saw.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 5, the punching tool 1 of the present invention is capable of forming a circular hole in a plate body, and a center shaft 3 to be inserted into a hole formed in the center of the circular hole in the case body 2 in advance. By rotating with the electric motor M parallel to the center shaft 3 and at a distance of the radius of the circular hole from the center of the center shaft 3, the circular hole is drilled in the plate body while rotating about the center shaft 3. The groove cutting cutter 4 to be provided is provided, and the position changing means 5 is provided for changing the distance of the center shaft 3 from the groove cutting cutter 4.

In the present embodiment, the case main body 2 is composed of a base 7 having the electric motor M and a battery housing A for housing a battery for driving the electric motor M, and a pedestal 9 attached to the base 7. Become.

The base body 7 has a base portion 7A for accommodating the electric motor M and a battery accommodating portion A. A handle 7B is provided at the rear end of the base portion 7A and a screw groove is formed on the outer peripheral surface at the front end. The provided cylindrical threaded portion 7C is formed. It should be noted that the cutter mounting shaft 10 rotated by the electric motor M is attached to the threaded portion 7
It projects through the inside of C from the front end of the base 7.

As shown in FIG. 4, the cutter mounting shaft 10 has a taper portion 10 whose front end is reduced in diameter toward the rear.
The groove cutting cutter 4 is attached by using a collet chuck 11 fitted in the tapered portion 10A.

The collet chuck 11 has a hole 12A capable of reducing its diameter in the center and a sleeve 12 whose outer peripheral surface can contact the tapered portion 10A, and a sleeve 12 for pressing the sleeve 12 into the cutter mounting shaft 10. The main body 13 has a rectangular shape. The lower part of the groove cutting cutter 4 is inserted into the hole 13A of the main body 13 and the hole 12A of the sleeve 12, and then the main body 13 is screwed onto the cutter mounting shaft 10 so that the hole 12
By reducing the diameter of A, the groove cutting cutter 4 is fastened to the sleeve 12 as shown in FIG.
Can be firmly attached to.

The pedestal 9 has a threaded portion 7C of the base body 7.
9A of cylindrical falling parts screwed to the
A circular receiving portion 9B extending at a right angle from the front end of the
A base portion 14 having a front opening integrally provided with a rising portion 9C continuously rising from the peripheral edge of the base, and a base made of rubber or the like fixed to the outer peripheral surface on the outer peripheral surface of the rising portion 9C. The dust-proof cover 16 planted on the wheel 15 is arranged with its front end located in front of the front end of the rising portion 9C.

The pedestal 9 has the lowering portion 9A as a base body 7.
It is attached to the base body 7 so that the position can be adjusted in the front-rear direction by being screwed to the screwing portion 7C of the base 7, so that the protrusion from the front end of the rising portion 9C of the groove cutting cutter 4 can be adjusted according to the thickness of the plate body. Can be adjusted.

A lock nut 17 for fixing the pedestal 9 with which the rear end of the lowering portion 9A of the pedestal 9 abuts is screwed to the threaded portion 7C.

A center shaft 3 is provided on the pedestal 9 of the case body 2 via the position changing means 5. In the present embodiment, the position changing means 5 is composed of a circular substrate 19 rotatably arranged on the front surface of the receiving portion 9B of the receiving table 9. Board 19
Is to screw a nut 21 onto the screw shaft 20A of a bolt fitting 20 having a screw shaft 20A at the front and passing through a hole provided in the receiving portion 9B and a hole provided at the center of the substrate 19. To rotatably attach to the pedestal 9.

On the front surface of the substrate 19, a cylindrical center shaft mounting portion 22 is disposed near the periphery thereof, and the lower portion of the center shaft 3 is inserted into the center shaft mounting portion 22 and a set screw is provided. The center shaft 3 is detachably attached to the center shaft attachment portion 22 by screwing 23 in. By the attachment, the center shaft 3 becomes parallel to the groove cutting cutter 4, and the front end thereof is located in front of the front end of the groove cutting cutter 4.

Further, as shown in FIG. 3, the substrate 19 and the receiving portion 9B are marked with a scale 24 for indicating the distance between the center shaft 3 and the groove cutting cutter 4, and the substrate 19 is also provided. Has a positioning piece 25 for positioning the substrate 19. The positioning piece 25, as shown in FIG.
A rear open tubular body 25A that is inserted into the base plate 19 using a nut 26, a sphere 25B that fits into the rear end of the tubular body 25A, and a bridge between the sphere 25B and the inner surface front end of the tubular body 25A. It is composed of a spring piece 25C that presses the spherical body 25B against the receiving portion 9B, and when the center shaft 3 moves to a predetermined position by the rotation of the substrate 19, the spherical body 25B fits into the hemispherical concave portion 27 provided in the receiving portion 9B. Then, the substrate 19 is positioned.

Therefore, the pedestal 9 is attached to the base body 7 by screwing while adjusting the margin from the front end of the rising portion 9C of the groove cutting cutter 4 according to the thickness of the plate body having the circular hole. The falling portion 9A is attached to the portion 7C by screwing.

Further, the electric motor M is driven with the center shaft 3 removed from the center shaft mounting portion 22, and a hole is preliminarily formed at the center of the circular hole by the groove cutting cutter 4.

After that, the electric motor M is temporarily stopped, the center shaft 3 is inserted into the center shaft mounting portion 22, and the set screw 23 is inserted.
The center shaft 3 is firmly fixed to the center shaft mounting portion 22 by fully tightening, and the substrate 19 is rotated to move the center shaft 3 from the groove cutter 4 to the distance of the radius of the circular hole. Position them apart.

Further, the nut 21 is fully tightened, and the substrate 1
9 is made non-rotatable and the electric motor M is driven to rotate the groove cutting cutter 4. The center shaft 3 is inserted into the center hole of the circular hole, and the groove cutting cutter 4 is screwed into the plate body until the front end of the rising portion 9C of the pedestal 9 comes into contact with the plate body. 3 around the handle 7B
The case body 2 is rotated with the clue as a clue to form the circular hole.

The dust-proof cover 16 covers the periphery of the rising portion 9C at the time of forming a circular hole to prevent chips from scattering around.

As described above, since the punching tool 1 is provided with the position changing means 5, it is possible to cope with circular holes having different diameters with one touch, which improves workability, and in the present embodiment, the center shaft 3 is detachable. Therefore, the hole at the center of the circular hole can be transparently provided by using this punching tool 1.

6 to 8 show another embodiment of the present invention. In the present example, the position changing means 5 includes a rectangular substrate 29 placed on the front surface of the receiving portion 9B of the receiving base 9 of the case body 2, and both side edges of the substrate 29 protruding from the receiving portion 9 and forming long sides of the substrate 29. And a pair of side plates 30 that slidably fit together.

The substrate 29 is provided with a cylindrical center shaft mounting portion 22 standing upright on the front surface thereof and in the vicinity of one short side edge thereof, and extends along the long side thereof, and is screwed on the base body 7 at a portion 7C. An elongated hole 31 is provided for inserting the.

The side plate 30 has a horizontally long rectangular mounting piece 30A screwed to the front surface of the receiving portion 9B, and the mounting piece 3A.
The standing piece 30B rises at a small height from the side edge of the 0A facing the substrate 29, and the front piece 30C extends from the front end of the standing piece 30B onto the substrate 29.

The pair of side plates 30, 30 has a front piece 30.
The base plate 29 is slidably attached to the pedestal 9 by C and 30C, and the long side of the base plate 29 is fitted with a spherical body 32 in a hemispherical concave portion 33 provided on the standing piece 30B. By doing so, a positioning piece 34 for positioning the substrate 29 is arranged. Further, as shown in FIG. 8, on the front surface of the front piece 30C and the front surface of the board 29, a set screw 35 is attached to the center shaft mounting portion 22 provided on the positioned board 29.
A scale 36 indicating the distance between the center shaft 3 and the groove cutting cutter 4 to be mounted by using is marked.

The substrate 29 slides on the front surface of the receiving portion 9B along the elongated hole 31 to change the distance from the groove cutting cutter 4 of the center shaft 3 and the positioned substrate 29 is It is pressed by the lock nut 37 for fixing the substrate 29, which is screwed to the screwing portion 7C of the base 7, and is fixed at this position.

FIG. 9 shows still another embodiment of the present invention.
In this example, the punching tool 1 has a case body 2 in which a handle 41 is attached to the rear end of a cylindrical base 40 in which an electric motor is accommodated, and a cylindrical pedestal 43 having a front opening is attached to the front end through a small diameter portion 42. The groove cutting cutter 4 is attached to the cutter attachment shaft 45 rotated by the electric motor by using the collet chuck 11.

The front end of the groove cutting cutter 4 is located in front of the front end of the rising portion 43A forming the peripheral surface of the pedestal 43, and the dust cover 1 is provided on the peripheral surface of the rising portion 43A.
6 are provided.

Further, the center shaft 3 extends from the rear end of the rising portion 43A of the pedestal 43 at a right angle and horizontally, and repositioning means 5 is provided.
It is provided in the case main body 2 via. Relocation means 5
Is composed of a rectangular plate-shaped projecting piece 46 projecting from the rear end of the rising portion 43A, and a sliding piece 47 having a space 47A for relatively densely inserting the projecting piece 46 therein.

On the front surface of the sliding piece 47 and near the edge,
A cylindrical center shaft mounting portion 22 for mounting the center shaft 3 in parallel with the groove cutting cutter 4 by using a set screw 49 is provided, and the rear side of the sliding piece 47 is coaxial with the center shaft 3. The body 50 is lowered, and a grip 51 is rotatably attached to the shaft body 50.

The sliding piece 47 can change the distance between the center shaft 3 and the groove cutting cutter 4 by sliding along the protruding piece 46, and the scale 52 marked on the front surface of the protruding piece 46. The aligned slide piece 47 has a protruding piece 46.
It is fixed to the projecting piece 46 by using a bolt metal fitting 53 passing through the long hole 46A provided in the.

However, the center shaft 3 is inserted into a hole of a plate body formed in advance in the center of the circular hole, and the groove is adjusted to a position separated from the center of the center shaft 3 by the radial length of the circular hole. A circular hole can be formed by screwing the cutting cutter 4 into the plate body, gripping the grip 51 and the grip 41, and rotating the case body 2 about the center shaft 3.

When the case body 2 is rotated, the front end of the rising portion 43A of the pedestal 43 abuts against the plate body, the dust cover 16 can prevent scattering of chips, and the center of the circular hole can be prevented. The hole can be formed by rotating the groove cutter 4 with the center shaft 3 removed from the center shaft mounting portion 22.

[0038]

As described above, since the punching tool of the present invention has the position changing means for changing the distance of the center shaft from the groove cutting cutter, it is possible to form circular holes having different diameters. The workability can be improved as compared with a hole saw, and by setting a long distance between the center shaft and the groove cutting cutter, it is possible to form a circular hole having a large diameter.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a main part thereof.

FIG. 3 is a plan view thereof.

FIG. 4 is an exploded perspective view illustrating a method of attaching the groove cutting cutter.

FIG. 5 is a cross-sectional view illustrating a mounting state of the groove cutting cutter.

FIG. 6 is a sectional view showing another embodiment of the present invention.

FIG. 7 is a partial cross-sectional view showing the position changing means.

FIG. 8 is a plan view thereof.

FIG. 9 is a perspective view showing still another embodiment of the present invention.

[Explanation of symbols]

 2 Case body 3 Center shaft 4 Groove cutter 5 Position changing means

Claims (1)

[Claims] 1. A punching tool capable of punching a circular hole in a plate body, comprising:
A center axis is inserted into a hole formed in the center of the circular hole in the case body, and is rotated by a motor at a distance parallel to the center axis and a radius of the circular hole from the center of the center axis. By providing a groove cutting cutter for punching the circular hole in the plate body as the center shaft rotates about the center shaft, a position changing means for changing the distance of the center shaft from the groove cutting cutter is provided. Become a punch.