JP2001009612A - Hole saw attaching/detaching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate handling and to improve working efficiency by allowing a single operation for hole saw changing and making a hole saw detachable. SOLUTION: This device comprise a hole saw fitting mounting means 10 comprising: polygonal fitting parts 2a, 5a fitting to each other at their projecting and recessed parts between the other end of a hole saw fitting 2 and one end of a shank 5; a hole part bored in a direction from the outer peripheral face of the fitting part 5a of the shank 5 toward the outer periphery of the hole saw fitting 2; a sphere 13 inserted in the hole part; an annular groove 15 provided along the outer peripheral face of the shank 5; and an annular spring 14 inserted in the annular groove 15 for pressing the sphere 13 to prevent it from coming off from between the hole saw fitting 2 and the shank 5; and a center pin fitting means comprising: a guide groove 19 provided in the vicinity of a shank insertion end of a center pin; and a fitting member with an elastic member provided to the shank 5 and fitted in the guide groove 19 to make the center pin detachable from the shank 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hole saw attaching / detaching apparatus which makes a hole saw detachable and makes it easy to replace the hole saw with one touch.

[0002]

2. Description of the Related Art Conventionally, hole saws have various types of hole diameters, and it is 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. And troublesome handling. For this reason, the separation / split type is increasing from the integral type.

FIG. 11 is a schematic structural view of a conventional split-type hole saw attaching / detaching apparatus. In the figure, a hole saw attaching / detaching device 1 is shown.
The hole saw 3 is fixed integrally with the mounting bracket 2,
The shank 5 is detachably connected to a boring portion of a processing machine (not shown) by a detachable shank 5 and a screw portion 4. 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. The spring 8 is inserted into the center pin 6, one end is a fixed end fixed to the mounting bracket 2, and the other end is a free end.

FIG. 12 is an explanatory view of a method of using the split type hole saw attaching / detaching device. 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, replacing the center pin (or center guide drill) 6 requires a hexagon wrench for tightening and loosening the set screw 7, and replacing the hole saw 3 requires a wrench. However, there is a problem in terms of complexity of handling and work efficiency.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hole saw attaching / detaching apparatus in which the operation of replacing the hole saw is one-touch, detachable, easy to handle, and improved in work efficiency in order 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 the other end of the hole saw mounting bracket at one end. A hole saw attachment / detachment device having a shank to be inserted and the other end attached to a piercing portion of a processing machine, and a center pin inserted into the center of the shank and guiding the hole saw when piercing; the other end of the hole saw mounting bracket And a fitting part which is formed in a polygonal shape between one end of the shank and fits unevenly
A hole formed 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 a hole provided along the outer peripheral surface of the fitting portion of the shank; A shank for the center pin, comprising: an annular groove inserted into the annular groove; and an annular spring inserted into the annular groove to apply pressure to the sphere to prevent the hole saw from being detached from the shank. A center pin fitting means comprising: a guide groove provided near the insertion end; and a fitting member with an elastic member provided in the shank and fitted in the guide groove to make the center pin detachable from the shank. A hole saw attachment / detachment device comprising:

According to one embodiment of the present invention, the guide groove is an inclined groove that makes the groove deeper along the rotation direction of the center pin.

[0009]

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

FIG. 1 is a schematic configuration diagram of an embodiment as a main part of the present invention, and FIG. 2 is a cross-sectional view of FIG. 1 and 2, a hole saw mounting bracket mounting means 10 for constituting the hole saw mounting / removing device of the present invention has a polygonal shape (a hexagon in this embodiment) between the other end of the hole saw mounting bracket 2 and one end of the shank 5. Fitting part 2 formed in the shape
a, 5a, a sphere 13 inserted into the inclined hole 12 provided in the direction of the hole saw mounting fitting 2a from the shank fitting 5a, and an annular groove 15 provided along the outer periphery of the shank 5. And the formed annular spring 14. The annular spring 14 holds and presses the sphere 13 in the inclined hole 12 by a notch 14a having an angle of about 60 degrees. Reference numeral 17 denotes an insertion hole of the center guide drill 6 inserted into the shank 5.

As shown in FIGS. 3 and 4, when the outer diameter d1 of the shank 5 to be applied is, for example, 25 mm, the groove diameter d2
Has a standard dimension of 23.9 mm and a groove width m of 1.35.
mm, the standard size of the spring inner diameter d3 of the annular spring 14 is 23.4 mm, the standard size of the spring width b is 2 mm, and the standard size of the thickness t is 1.2 mm.

In order to mount the hole saw mounting bracket 2 on the shank 5, the fitting portions 2a and 5a are fitted together and inserted into the shank 5, and the sphere 13 is fitted to the fitting portion 2 of the hole saw mounting bracket 2.
When the hole 13 is matched with the groove 16a, the spherical spring 13 is held in the groove 16 by the elastic force of the annular spring 14, so that the hole saw mounting bracket 2 is prevented from falling off from the shank 5.

FIG. 5 is a schematic structural view of a center pin fitting means which is another main part of the present invention, FIG. 6 is a cross sectional view of FIG. 3, and FIG.
8 shows a guide groove machining diagram of the center guide drill shown in FIG. 5, and FIG.
Shows a bottom view of FIG. 5 to 8, a center pin fitting means 18 includes a guide groove 19 provided near the shank insertion end of the center guide drill 6, and a center guide with an elastic member provided in the shank 5 and fitted in the guide groove 19. The fitting member, in this embodiment, comprises a sphere 20 with urethane material. In the sphere 20 with urethane material, the sphere (ball) 22 is fitted into the guide groove 19 so that the center guide drill 6 is engaged with the shank 5, and the center guide drill 6 is detachable from the shank 5. Reference numeral 23 denotes urethane rubber for pressing the spherical body 22, and reference numeral 24 denotes a pressing adjustment screw screwed to the shank 5.

At this time, when the sphere 22 is completely retracted from the guide groove 19, the drill 6 may not be able to rotate. For this purpose, the guide groove 19 is an inclined groove whose depth becomes deeper in the rotation direction of the drill 6, and has a groove diameter k1 <k2. Therefore, the sphere 22 is pressed in the rotation direction (k2 direction) and always comes into contact with the guide groove 19 to prevent the drill 6 from being unable to rotate, and the fitting state between the guide groove 19 and the sphere 18 is well maintained. You. Although urethane rubber is used as the elastic member, as shown in FIG.
It may be five. A sphere 27 and a spring 28 are integrally accommodated in the adjustment screw 26.

A plunger 29 with a spring may be used as shown in FIG. A plunger 31 and a spring 32 are integrally accommodated in the adjusting screw 30.

In FIGS. 7 and 8, since the shank 5 is a rotating body, the spring-loaded sphere 25 or the spring-loaded plunger 29 is designed so that the length 1 does not become large enough to protrude outside the shank 5. Should.

As described above, since the hole saw attaching / detaching device is provided with the hole saw mounting bracket mounting means 10 and the engaging member with the elastic member, in this embodiment, the sphere 18 with the urethane material, the replacement work of the hole saw 3 is simplified. One touch, detachable, easy to handle, and work efficiency is improved.

[0018]

As is apparent from the above description, the hole saw attachment / detachment device of 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 with concave and convex. 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. And a guide provided near the shank insertion end of the center pin, the means for mounting a hole saw mounting member comprising an annular spring which is inserted into the annular groove and applies a pressure to the sphere to prevent the hole saw mounting member and the shank from falling off. A center pin fitting means comprising: a groove; and a fitting member provided with an elastic member provided in the shank and fitted in the guide groove to make the center pin detachable from the shank. The guide groove is an inclined groove that deepens the groove along the direction of rotation of the center pin, effectively solving the problems of the prior art, making it easy to replace the hole saw with one touch and detachable. It is easy to handle and has a large effect, such as improvement in work efficiency.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an embodiment which is a main part of the present invention.

FIG. 2 is a cross-sectional view of FIG.

FIGS. 3A and 3B are schematic views of an annular spring, wherein FIG. 3A is a front view thereof and FIG. 3B is a plan view thereof.

FIG. 4 is a schematic view of an annular groove provided on an outer periphery of a shank.

FIG. 5 is a schematic configuration diagram of a center pin fitting means which is another main part of the present invention.

FIG. 6 is a cross-sectional view of FIG.

FIG. 7 is a guide groove machining diagram of the center guide drill of FIG. 5;

FIG. 8 is a bottom view of FIG. 7;

FIG. 9 is an explanatory view of another configuration of the center pin fitting means of FIG. 5;

FIG. 10 is an explanatory view of still another configuration of the center pin fitting means of FIG. 5;

FIG. 11 is a schematic configuration diagram of a conventional split type hole saw attaching / detaching device.

FIG. 12 is an explanatory diagram of a method of using the split type hole saw attaching / detaching device.

[Explanation of symbols]

 Reference Signs List 2 hole saw mounting bracket 3 hole saw 5 shank 6 center guide drill 10 hole saw mounting bracket mounting means 12 hole 13 sphere 14 annular spring 15 annular groove 16 concave groove 18 center pin fitting means 19 guide groove 20 sphere with urethane material

Claims (2)

[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 hole saw attaching / detaching device having a center pin inserted into the center of the 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 to form a concave and convex fit. A hole to be drilled from the outer peripheral surface of the fitting portion of the shank to the fitting portion of the hole saw mounting bracket, a sphere inserted into the hole, and an outer periphery of the fitting portion of the shank. An annular groove provided along the surface, and a ring inserted into the annular groove to apply pressure to the sphere to prevent the hole saw mounting bracket from falling off from the shank. Means for mounting a hole saw mounting bracket comprising a spring; a guide groove provided near a shank insertion end of the center pin; and a center groove provided on the shank and fitted to the guide groove so that the center pin can be detachably attached to the shank. And a center pin fitting means comprising a fitting member with an elastic member. 2. The method according to claim 1, wherein the guide groove is
A hole saw attachment / detachment device characterized in that the groove is deepened along the rotation direction of the center pin.