JP2838824B2 - Centering member for diamond core bit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diamond core bit used to make a hole in a material having a smooth surface such as a stone.

[0002]

2. Description of the Related Art As shown in FIG. 7, a conventional diamond core bit 110 of this type is formed on a shank 111 for mounting on an electric drill, a bit body 112 mounted on the shank 111, and an end of the bit body 112. A center pin 114 having a sharp tip is attached to the shank 111 in order to determine a center position for drilling.

In use, first, the work material 11
The top of the center pin 114 is pressed against the surface of No. 8, and the entire diamond core bit is pressed firmly until the diamond abrasive layer comes into contact with the surface of the work material to drill a hole to a depth of 3 to 4 mm. Thereafter, the center pin 114 is removed by raising the diamond core bit. At this time, since a shallow annular groove is formed in the work material 118, a technique is employed in which the front end of the diamond core bit is aligned with the shallow annular groove to drill a deeper hole.

[0004]

However, in the prior art, if the surface of the work material is rough like concrete, it is necessary to position the work piece with a center pin and then drill the work material without any problem. However, in the case of a work material with a smooth surface such as marble, when the tip of the center pin is pressed against the surface of the work material, the point of the center pin slips, making it difficult to position. was there.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned disadvantages, and an object of the present invention is to position a diamond core bit in a center of a diamond core bit, which can easily perform positioning on a work material having a smooth surface and can reliably drill holes. It is to provide a member.

[0006]

According to a first aspect of the present invention, a center positioning member for a diamond core bit is formed at a shank connected to an electric motor, a bit body connected to the shank, and at an end of the bit body. A diamond abrasive grain layer, and a center pin attached to the shank, a center positioning member of a diamond core bit, wherein the center positioning member is a rotating member that rotates with the center pin, and a suction cup connected to the rotating member. Characterized by the following.

According to a second aspect of the present invention, the work piece is made of a material having a smooth surface, one end of the center pin is connected to a shank side, and the other end of the center pin is connected to the center pin. The rotating member is connected to a suction member, and the rotation member is connected to a suction cup, and the suction cup is configured to be attracted to a work material.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A center positioning member 17 of a diamond core bit according to the present invention is formed on a shank 11 connected to an electric motor, a bit body 12 connected to the shank 11, and an end of the bit body 12. A diamond core bit 10 having a diamond abrasive grain layer 13 and a center pin 14 attached to a shank 11 includes a rotating member 15 that rotates with the center pin 14 and a suction cup 16 connected to the rotating member 15. ing.

As described above, according to the present invention, the center positioning member 17 includes the rotating member 15 which rotates together with the center pin 14, and the suction cup 16 connected to the rotating member 15.
The suction pin 16 can be attracted to the position where the work material 18 is to be drilled and the position can be fixed, and the rotation of the center pin 14 is prevented from being transmitted to the suction cup 16 by the rotating member 15. Therefore, even in the case of the work material 18 having a smooth surface, the positioning member 17 does not slip and the work material 18 can be easily drilled.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention, and can be variously modified within the scope of the present invention.

FIGS. 1 to 6 show a specific embodiment according to the present invention. FIG. 1 is a side view of a diamond core bit provided with a center positioning member according to the present invention, and FIG. FIG. 3 is an explanatory view of a center pin, FIG. 4 is a plan view of a suction cup, FIG. 5 is a side view of a center positioning member, and FIG. 6 is a schematic explanatory view showing contact between a diamond core bit and a work material. .

The diamond core bit positioning member 17 of the present embodiment is used by being incorporated into the diamond core bit 10.

Generally, a diamond core bit 10 includes a shank 11 connected to an electric motor (not shown), a bit body 12 connected to the shank 11, and a diamond abrasive layer 13 formed at an end of the bit body 12.
And a center pin 14 attached to the shank 11. The configuration itself of the core bit 10 of this example is the same as that of a conventionally known configuration.

The shank 11 is connected to an electric motor at a connecting portion 11a, and a spring 11b and a steel ball 1 are provided in a hollow portion.
1c are formed. A bit body 12 is connected to the shank 11 by screws.

The bit body 12 is a hollow cylindrical member as shown in FIG. 1. A screw for connecting to the shank 11 is formed at one end, and the other end is opened. On the opened peripheral surface, a diamond abrasive layer 13 is formed.
Are formed.

As shown in FIGS. 1 and 2, the center pin 14 is located in a hollow portion of the shank 11 and the bit body 12. In the shank 11, a spring 11b formed in the hollow portion of the shank 11 is provided. Of the center pin 14 by the urging force of
It is locked by engaging with c.

The center pin 14 has a built-in spring 14b. The spring 14b allows the center pin 14 to extend and contract in the hollow portion of the bit body 12.

Further, the end portion 14 of the center pin 14 of this embodiment
As shown in FIG. 3, a is formed without sharpening the tip as in the related art.

As shown in FIG. 5, the center positioning member 17 of the present invention includes a bearing member 15 as a rotating member.
And a suction cup 16.

Bearing 1 of bearing member 15 of the present embodiment
5a is a ball bearing (for example, NACHI606Z)
And the like, and the outer frame 15b is a frame having a concave portion 15c.
Is arranged. The bearing 15a is connected to the outer frame 1
5b is fixed to the recess 15c.

The bearing 15a has a hole 15d in the center.
The hole 15d is formed in such a size that the end 14a of the center pin 14 can be fitted. And the end 14 of the center pin 14
a is fitted into the hole 15d, and only the inner ring 15f of the bearing 15a rotates with the rotation of the center pin 14.

The suction cup 16 of this embodiment is a circular member formed of a soft material, and is fixed on the bottom surface 15e of the outer frame 15b.

Next, a method of drilling using the core bit center positioning member 17 of the present invention will be described. First, the center pin 14 is inserted into the shank 11 and the bit body 12 as in the related art. At this time, in the hollow portion of the shank 11, the center pin 14 is locked by the steel ball 11c urged by the spring 11b of the shank 11.

The center of the center positioning member 17 is made to coincide with a predetermined position (the center position of the hole to be opened) on the surface of the work material 18, and the suction cup 16 is attracted to the surface of the work material 18. The tip of the center pin 14 is fitted into the hole 15d of the bearing 15a of the positioning member.

After the above-described preparations are completed, as shown in FIG.
The bit is pressed firmly until the diamond abrasive grain layer 13 at the tip contacts the surface of the work material 18, and the bit is rotated until an annular groove having a depth of 3 to 4 mm is formed.

At this time, the outer frame 15b of the center positioning member 17 is fixed to the suction cup 16.
Is fixed on the surface of the work material 18, so that the bearing 15 a rotates together with the center pin 14.

When an annular groove having a depth of 3 to 4 mm is formed,
Stop drilling, pull off the entire diamond bit 10,
The center pin 14 is pulled out from the diamond bit 10, and the positioning member 17 adsorbed on the surface of the work material is removed. The diamond abrasive layer 13 at the tip of the bit body 12 of the diamond bit 10 is again inserted into the formed annular groove.
And continue drilling to make the desired holes.

The above-described drilling preparation operation sequence is an example, and the center pin 14 and the center positioning member 17 are previously determined.
May be joined by an adhesive, and the integrated body may be attached to the shank 11 to perform a hole drilling operation. Alternatively, the center pin 14 and the positioning member 17 may be provided integrally with each other by providing an uneven portion so as to be fitted therein, and may be integrally formed, or may be integrally formed using a mounting member such as a screw or a screw. Is also good.

In order to more reliably drill a hole at a desired position, a circle having substantially the same size as the suction cup 16 is drawn in advance at the drilling position of the work material 18, and the suction cup is fitted to this circle. Drilling may be performed.

Alternatively, the suction cup 16 is formed of a transparent member,
The holes may be formed so that the positions of the holes on the workpiece 18 can be easily seen even from the outside.

The diamond abrasive layer 13 provided at the tip of the bit body 12 may be a diamond chip or an abrasive layer formed by electrodeposition.

[0032]

As described above, according to the center positioning member of the present invention, the center positioning member is constituted by the rotating member that rotates together with the center pin and the suction cup connected to the rotating member. The sucker can be fixed at the position where the material is drilled by sucking it, and the rotation of the center pin is prevented from being transmitted to the suction side by the rotating member, so that the surface of the work material such as marble has a smooth surface. In drilling, positioning can be performed easily, and drilling can be performed reliably.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a diamond core bit equipped with a center positioning member according to the present invention.

FIG. 2 is an explanatory view of a shank according to the present invention.

FIG. 3 is an explanatory diagram of a center pin according to the present invention.

FIG. 4 is a plan view of a suction cup in the center positioning member according to the present invention.

FIG. 5 is an explanatory side view of a center positioning member according to the present invention.

FIG. 6 is a schematic explanatory view showing contact between a diamond core bit and a work material.

FIG. 7 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Diamond core bit 11 Shank 12 Bit body 13 Diamond abrasive layer 14 Center pin 15 Bearing member 16 Sucker 17 Center positioning member 18 Work material

Claims (2)

(57) [Claims] 1. A shank connected to an electric motor, a bit body connected to the shank, a diamond abrasive layer formed at an end of the bit body, and a center pin attached to the shank. In the center positioning member for a diamond core bit, the center positioning member for the diamond core bit includes a rotating member that rotates together with the center pin, and a suction cup connected to the rotating member. Element. 2. The work material is a material having a smooth surface,
One end of the center pin is connected to the shank side, the other end of the center pin is connected to the rotating member, the rotating member is connected to a suction cup, and the suction cup is configured to adsorb to the work material. The center positioning member for a diamond core bit according to claim 1, wherein: