JP2001105401A - Separate-type hole saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure the performance of a one-touch hole saw replacement operation, the free attachment/detachment of the saw, the ease of its handling, and the enhancement of operating efficiency and concentricity. SOLUTION: The separate-type hole saw comprises a fitting part which is of a polygonal shape formed between the other end of a holding saw fixture 14 and one end of a shank 15 and fits unevenly, a hole part 16 perforated from the outer peripheral face of the fitting part of the shank 15 to the fitting part of the hole saw fixture 14, a spherical body 17 inserted into the hole part 16, a hole saw fixture attaching/ detaching part 11 consisting of an annular groove formed along the outer peripheral face of the fitting part of the shank 15 and an annular spring 20 which fits the hole saw fixture 14 into the shank 15 by applying pressure to the spherical body 17 inserted into the annular groove, an arc-shaped groove 26 formed near the shank inserting end of a center pin 6 and a center pin attaching/detaching part 12 which mounts the center pin 6 into the shank 15 by means of the spherical body 17 to be inserted into the arc-shaped groove 26. In addition, an outer peripheral ring 33 is mounted on the outer periphery of the shank 15 so that locking or unlocking is performed simultaneously with installation or removal of the saw by a specified rotation angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a separate type hole saw which makes a hole saw detachable and allows the hole saw to be easily replaced with one touch.

[0002]

2. Description of the Related Art Conventionally, hole saws have various types of hole diameters, and it has been necessary to always provide various types of hole saw mounting brackets having different effective lengths of blade portions, center pin lengths, shank shapes, and the like. . Therefore, there is a problem that the handling of the hole saw is troublesome and troublesome. For this reason, there is a tendency that the number of separate-type hole saws increases from the integral type.

FIG. 11 is a schematic diagram showing the structure of a conventional separation type hole saw. In the figure, a separate type hole saw 1 has a hole saw 3 integrally fixed with a mounting bracket 2 and is connected to a detachable shank 5 and a screw portion 4 at a perforated portion of a processing machine (not shown). The shank 5 is provided with a center pin (or a center guide drill or the like) 6 used as a center guide at the time of drilling, and is fixed with a stopper screw 7. Note that the spring 8 is a center pin 6
And one end is a fixed end fixed to the mounting bracket 2, and the other end is a free end, which eliminates a blank (cutting waste) being drilled.

FIG. 12 is an explanatory view of a method of using the separation type hole saw of FIG. In the figure, two kinds of large and small hole saws 3A, 3B, mounting brackets 2A, 2B, and a shank 5 are shown.
A, 5B, and center guide drills 6A, 6B and an intermediate connection fitting 9. In the case where the sizes are different from each other, the intermediate connection fitting 9 is often required.
The mounting brackets 2A and 2B and the shank 5A and 5B
Hexagonal fitting portions a and b are provided between the base member and the intermediate connection fitting 9 so as to be fitted with concave and convex portions, and are fixed by stopper screws 11 to prevent falling off.

[0005]

However, the work of replacing the center pin (or center guide drill) 6 requires a hexagon wrench for tightening and loosening the set screw 7, and the work of replacing the hole saw 3 requires a wrench or the like. However, there is a problem in that the handling is complicated and the work efficiency is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a separation type hole saw in which the operation of replacing the hole saw is one-touch, detachable, easy to handle, and easy to handle, so as to improve the above-mentioned problems. .

[0007]

In order to achieve the above object, the present invention provides a hole saw, a hole saw mounting bracket having one end integrally attached to the hole saw, and a second end of the hole saw mounting bracket at one end. A separate type hole saw having a shank to be inserted and the other end mounted on a drilling portion of a processing machine and a center pin inserted into a center portion of the shank and guiding the hole saw when drilling; the other end of the hole saw mounting bracket A fitting portion formed into a polygonal shape between the first and second ends of the shank and fitting the concave and convex, and a first hole portion drilled from the outer peripheral surface of the fitting portion of the shank toward the fitting portion of the hole saw mounting bracket. A first sphere inserted into the first hole, and a first ring having a concave arcuate cross section provided on an outer peripheral surface of a fitting portion of the hole saw mounting bracket and engaging with the first sphere. A second annular groove provided along the outer peripheral surface of the shank through the first hole, and a hole inserted into the second annular groove to apply pressure to the first sphere to provide the hole saw mounting bracket A hole saw attachment / detachment part comprising a first annular spring for preventing falling off between the shaft and the shank; an arc-shaped groove provided near the shank insertion end of the center pin; and the arc-shaped groove provided in the shank A second hole, a second sphere inserted into the second hole, a third annular groove provided along the outer peripheral surface of the shank through the second hole, A center pin attaching / detaching portion comprising a second annular spring inserted into the third annular groove to apply pressure to the second sphere to prevent the center pin and the shank from falling off; provided on the outer periphery of the shank , The first and second An outer peripheral ring for simultaneously locking or unlocking by changing the pressing of the hole saw attaching / detaching portion to the first sphere and the center pin attaching / detaching portion to the second sphere by giving a required rotation angle to the annular spring. The present invention relates to a separate type hole saw.

According to one embodiment of the present invention, the center pin attaching / detaching portion includes an arc-shaped groove provided near the shank insertion end of the center pin, and a second groove provided in the shank and perforated toward the arc-shaped groove. A third sphere inserted into the third hole to apply pressure to the arc-shaped groove to prevent the center pin and the shank from falling off. Locked or unlocked by pressing on the sphere.

According to another embodiment of the present invention, the outer peripheral ring is provided with a guide groove on the inner surface, and the third spherical body which engages with the guide groove and maintains the rotation angle at about 60 degrees is formed with the shank. Between them.

[0010] According to another embodiment of the present invention, the hole saw mounting bracket attaching / detaching portion has a circumference of 3 degrees every 120 degrees from the outer peripheral surface of the shank fitting section toward the fitting section of the hole saw mounting bracket. It has three first holes that are bored separately, and three first spheres inserted into the first holes.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing one embodiment of a separation type hole saw of the present invention, FIG. 2 is a cross-sectional view taken along the line AA of FIG.
3 is a sectional view taken along line C in FIG. 2, FIG. 4 is a locked state diagram of a hole saw mounting bracket attaching / detaching portion, FIG. 5 is a cross-sectional view taken along line BB of FIG. FIG. 4 shows a locked state diagram of a center pin attaching / detaching portion. 1 to 6
In FIG. 1, the separation type hole saw 10 of the present invention is mainly composed of a hole saw mounting bracket attaching / detaching portion 11, a center pin attaching / detaching portion 12, and an outer peripheral ring 13.

The hole saw mounting bracket attaching / detaching portion 11 is formed in a polygonal shape (in this embodiment, hexagonal) between the other end of the hole saw mounting bracket 14 and one end of the shank 15 and is fitted with concave and convex fittings. And the shank fitting portion 15a
From the outer peripheral surface of the fitting portion 14 of the hole saw mounting bracket 14.
a hole 16 pierced in the direction a, a sphere 17 inserted into the hole 16, and a fitting portion 1 of the hole saw mounting bracket 14.
4a, a concave arcuate annular groove 1 engaging with the spherical body 17 on the outer peripheral surface
8, an annular groove 21 provided along the outer peripheral surface of the fitting portion 15a of the shank 15 through the hole 16;
An annular spring 20 is inserted into the inside to apply pressure to the sphere 17 and mount the hole saw mounting bracket 14 on the shank 15.

The center pin attaching / detaching portion 12 includes an arc-shaped groove 26 provided near the insertion end of the center pin 6 into the shank 15, and a hole formed in the shank 15 and directed toward the arc-shaped groove 26. 23, two spheres 24 inserted into the hole 23, an annular groove 25 provided along the outer peripheral surface of the shank 15 through the hole 23, and an annular groove 25
And an annular spring 22 which is inserted into the inside and applies a pressure to the spherical body 24 to mount the center pin 6 on the shank 15. In this embodiment, the annular springs 20 and 22 have the same dimensions that can be shared.

Reference numerals 27, 27a denote center pins 6 provided on the shank 15 and the hole saw mounting bracket 14.
Insertion hole.

As shown in FIGS.
0 and 22 are the same outer diameter dimensions d of the shank 15 to be applied.
1, for example, 25 mm, the standard dimension of the groove diameter d2 is 2
The standard size of the groove width m is 3.9 mm, the standard size of the spring inner diameter d3 is 23.2 mm, the standard size of the spring width b is 3.1 mm, and the protrusion 30 provided in the gap 29 is 3.9 mm.
Is standardized to 4.3 mm.

As shown in FIGS. 2 and 5, the outer peripheral ring 13 is rotatably provided on the outer periphery of the shank 15 and has a storage portion 32 for storing the projections 30 of the annular springs 20 and 22 on the inner surface. Further, in order to maintain a required angle on the outer peripheral ring 13, in this embodiment, a rotation angle of about 60 degrees,
The inner surface of the outer ring 13 is provided with an annular groove 29 of about 60 degrees and a sphere 31 mounted on the shank 15 surface. Therefore, the outer peripheral ring 13 can rotate the annular springs 20 and 22 by the storage portion 32 and simultaneously lock or unlock the hole saw mounting bracket mounting portion 11 and the center pin mounting portion 12 with one touch.

The gap portion 29 of the annular spring 20 is
7, the ball 17 is in an easily detachable state (unlocked state) in which the ball 17 escapes outward, so that the hexagonal fitting portions 14a and 15a are fitted together and the ball 17 is inserted into the annular shape of the hole saw mounting bracket 14. By holding the sphere 17 in the annular groove 18 by the elastic force of the annular spring 20 in accordance with the groove 18, the hole saw mounting bracket 14 is prevented from falling off from the shank 15.

Similarly, when the gap 29 of the annular spring 22 is on the sphere 24 as shown in FIG. 5, the sphere 24 slightly escapes outward and is easily detached (unlocked state).
Therefore, by aligning the spherical body 24 in the hole 23 of the shank 15 with the arc-shaped groove 26 of the center pin 6 and holding the spherical body 17 in the annular groove 18 by the elastic force of the annular spring 22, the hole saw The mounting bracket 2 is prevented from falling off the shank 15. 28 is a cushion material interposed between the two spheres 24,24.

As shown in FIGS. 4 and 6, at the position where the rotation angle α of the outer peripheral ring 13 is about 60 degrees, the spheres 17 and 24 are not in the gaps 29 between the annular springs 20 and 22, respectively. It is kept locked and cannot be removed.

FIG. 9 is a schematic diagram showing another embodiment of the center pin attaching / detaching portion. In the figure, a center pin attaching / detaching portion 40 is shown.
Are an arc-shaped groove 26 provided near the insertion end of the shank 15 of the center pin 6, a hole 41 drilled toward the arc-shaped groove 26, and an elastic member inserted into the hole 41, such as a vine. Pressing the arc-shaped groove 26 through the winding spring 42,
Two spheres 4 with center pin 6 mounted on shank 15
3, 43.

The inner periphery of the outer ring 33 has a spherical body 43.
In order to maintain a required angle, that is, a rotation angle of about 60 degrees in the present embodiment, the outer circumferential ring 33 has a portion m having a gap between it and a portion n where the gap a is almost zero. An annular groove 29 of about 60 degrees is provided on the inner circumference of
By providing a sphere 31 inserted between the hole saw and the outer peripheral ring 13, locking or unlocking of the hole saw mounting bracket mounting portion 11 and the center pin mounting portion 40 can be performed simultaneously. FIG. 9 shows the locked state, and FIG. 10 shows the unlocked state. 44 is a sphere 43, a spring 41 and a sphere 3
1 is a lid for closing the insertion hole after assembling.

FIG. 11 is a schematic structural view showing another embodiment of the hole saw attaching / detaching part. In the figure, portions having the same functions as those in FIGS. 2 and 4 are denoted by the same reference numerals. The hole saw mounting bracket attaching / detaching portion 11 is formed by three holes formed by dividing the circumference into three equal parts every 120 degrees from the outer peripheral surface of the fitting section 15a of the shank 15 toward the fitting section 14a of the hole saw mounting bracket 14. And three spheres 17 inserted into the hole 16. By providing three spheres 16 in this manner, the shank 15
It is easy to increase the concentricity of the hole saw mounting bracket 14 with the hole saw mounting bracket 14.

As described above, the separation type hole saw 1 of the present invention
No. 0 is one-touch replacement work, is detachable, is easy to handle, improves work efficiency, and improves concentricity as compared with a conventional hole saw.

[0025]

As is apparent from the above description, the separation type hole saw according to the present invention has a fitting portion which is formed in a polygonal shape between the other end of the hole saw mounting bracket and one end of the shank, and which is fitted in an uneven manner. A hole portion drilled from the outer peripheral surface of the fitting portion of the shank toward the fitting portion of the hole saw mounting bracket, a sphere inserted into the hole portion, and an annular groove provided along the outer peripheral surface of the fitting portion of the shank. A hole provided in the vicinity of the shank insertion end of the hole saw mounting bracket attaching / detaching portion comprising a ring spring which is inserted into the annular groove and applies pressure to the sphere to prevent the hole saw mounting bracket from falling off from the shank; An arc-shaped groove and a center pin attaching / detaching portion for attaching the center pin to the shank by a sphere inserted into the arc-shaped groove are provided, and a required rotation angle of an outer ring provided on the outer periphery of the shank is provided. Locking and unlocking at the same time effectively solves the problems of the prior art, making it easy to replace the hole saw with one touch, detachable, easy to handle, improved work efficiency, and improved concentricity. The effect is large such as being enhanced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of a separation type hole saw of the present invention.

FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and is a unlocked state diagram of a hole saw mounting bracket attaching / detaching portion.

FIG. 3 is a cross-sectional view taken along the line CC of FIG. 2;

FIG. 4 is a lock state diagram of a hole saw mounting bracket attaching / detaching portion.

FIG. 5 is a cross-sectional view taken along the line BB of FIG. 1, and is a diagram showing an unlocked state of a center pin attaching / detaching portion.

FIG. 6 is a lock state diagram of a center pin attaching / detaching portion.

FIGS. 7A and 7B are schematic views of an annular spring, FIG. 7A is a front view thereof, and FIG. 7B is a plan view thereof.

FIG. 8 is a schematic view of an annular groove provided on the outer periphery of a shank.

FIG. 9 is a schematic configuration diagram showing another embodiment of the center pin attaching / detaching portion of the present invention.

FIG. 9 is an unlocked state diagram of FIG. 9;

FIG. 11 is a schematic configuration diagram showing another embodiment of a hole saw mounting bracket attaching / detaching portion.

FIG. 12 is a schematic configuration diagram of a conventional separation type hole saw.

FIG. 13 is an explanatory view of how to use a conventional separation type hole saw.

[Explanation of symbols]

 3 Hole Saw 6 Center Pin 10 Separate Hole Saw 11 Hole Saw Attachment Attachment Attachment Attachment 12 Center Pin Attachment Attachment 13 Peripheral Ring 14 Hole Saw Attachment Attachment 15 Shank 16 Hole 17 Spherical Body 18 Annular Groove 20, 22 Annular Spring 23 Hole 24 Sphere 25 Annular Groove 29 gap 30 protrusion 31 sphere

Claims (4)

[Claims] A hole saw having one end integrally attached to the hole saw, a shank having the other end inserted into one end and the other end attached to a perforated portion of a processing machine; In a separate type hole saw having a center pin inserted into a center portion of a shank and guiding the hole saw when drilling, a polygonal shape is formed between the other end of the hole saw mounting bracket and one end of the shank, and the concave and convex fit. A fitting portion, a first hole portion drilled from the outer peripheral surface of the fitting portion of the shank toward the fitting portion of the hole saw mounting bracket, a first sphere inserted into the first hole portion, A first annular groove provided on the outer peripheral surface of the fitting portion of the mounting bracket and engaging with the first sphere and having a concave circular cross section; and passing along the first hole portion and along the outer peripheral surface of the fitting portion of the shank. A second annular groove provided, first to prevent falling off between the hole saw mounting bracket and the shank provides a pressing to the first sphere is inserted in the second annular groove
A hole saw attachment / detachment part comprising an annular spring; an arc-shaped groove provided near the shank insertion end of the center pin; a second hole provided in the shank and drilled toward the arc-shaped groove; A second sphere inserted into the second hole, a third annular groove provided along the outer peripheral surface of the shank through the second hole, and the second sphere inserted into the third annular groove; A center pin attaching / detaching portion comprising a second annular spring for applying pressure to the sphere to prevent the center pin and the shank from falling off; a center pin attaching / detaching portion provided on the outer periphery of the shank; An outer peripheral ring that simultaneously locks or unlocks by changing the pressing of the hole saw attaching / detaching part to the first sphere and the center pin attaching / detaching part to the second sphere by giving a rotation angle; Separated hole saw, characterized in further comprising a. 2. The center pin attaching / detaching portion according to claim 1, wherein the center pin has an arc-shaped groove provided near the shank insertion end of the center pin, and a third hole formed in the shank and pierced toward the arc-shaped groove. A third sphere inserted into the third hole to apply pressure to the arc-shaped groove to prevent the center pin from falling off between the shank and the third sphere by a required rotation angle of the outer peripheral ring; Characterized in that the center pin is locked or unlocked to the shank by pressing on the shank. 3. The shank according to claim 1, wherein the outer peripheral ring is provided with a guide groove on an inner surface thereof, and the third spherical body is engaged with the guide groove to maintain the rotation angle at about 60 degrees. A separate type hole saw that is interposed between the hole saw. 4. The hole saw attachment / detachment part according to claim 1, wherein the hole saw attachment / detachment part is formed by dividing the outer periphery of the shank fitting part into the fitting part of the hole saw fitting by dividing the hole into three equal parts every 120 degrees. A separate type hole saw, comprising: a first hole; and three first spheres inserted into the first hole.