JPH0541727U - Thin body bit - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a core bit, which is a tip tool of a drilling machine for making holes in stone materials and concrete structures. It realizes a thin body with good discharge of cooling water and sludge generated by cutting. The purpose is to improve the drilling efficiency. A connecting portion of a shank portion 2 of a core bit 1 which is a tip tool connected to a drive source and a tube portion 4 connected to the shank portion 2 is formed in a reinforced thick portion 5, and This connection is configured as a screw connection so that the two can be separated from each other, so that the cut-out piece 15 can be easily taken out.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tip tool for a drilling machine (hereinafter referred to as a core bit) for drilling a hole in a stone material or a concrete structure. Regarding the structure.

[0002]

[Prior Art]

 A conventional core bit is shown in FIG. In a conventional core bit 1, a shank portion 2 that is firmly screwed to an adapter (not shown) mounted on an output shaft of an electric tool or the like, and a tube portion 4 having a cutting edge (chip) at its tip form a fitting surface 11. It is fixed with brazing through.

In this structure, the cutting edge portion and the brazed portion are maximally separated from each other in the vertical direction, and a large torque is generated in the brazed portion (fitting surface 11). There was a limit to how thin the portion 4 could be.

[0004]

[Problems to be solved by the device]

 As described above, the conventional core bit has a long overall length in order to cope with various thicknesses of the work material. Nevertheless, the tube part and the shank part were connected by brazing, and the structure needed to be thick enough to withstand the heavy cutting agent.

An object of the present invention is to provide a core bit that can improve the cutting efficiency without hindering the strength even if the entire length of the core bit is increased.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, in the core bit of the present invention, the shank portion connected to the drive shaft of the power tool and the upper portion of the tube portion connected to the shank portion are formed to be reinforced and thick. In addition to being separable from each other, the lower part of the tube part that is the actual cutting agent is formed as thin as possible to facilitate the flow of cooling water and the discharge of cutting powder sludge, improving cutting efficiency. It is characterized by being configured so that it can be measured.

[0007]

[Action]

 With the core bit configured as described above, it is possible to realize a core bit with good cutting efficiency during drilling work, and it is an extremely effective structure for taking out cut pieces.

[0008]

【Example】

 Hereinafter, the present invention will be described in detail with reference to illustrated embodiments. FIG. 1 is a partial vertical side view of a core bit 1 which is a tip tool of the present invention. In the figure, reference numeral 2 is a shank portion which is connected to an output shaft of an electric tool or the like not shown. Reference numeral 3 denotes a mounting screw portion, which is engraved on the inner diameter surface of the shank portion 2. Reference numeral 4 denotes a tube portion, in which a thick portion 5 is formed on the shank portion 2 side, a male screw 6 for coupling is engraved on the outer periphery thereof, and a female screw 7 for coupling is engraved on the large diameter portion of the shank portion 2. The core bit 1 is formed by screwing together. Reference numeral 8 is a through hole for mounting an appropriate bar to facilitate the firm screwing and separation of the shank portion 2 and the tube portion 4 in cooperation with the spanner hook portion 9. Reference numeral 10 denotes an abutting surface, which allows the thick wall portion 5 of the tube portion 4 to be in close contact with each other to maintain a strong bond. Reference numeral 11 denotes a fixing portion in FIGS. 2 to 3, which joins the tube portion 4 and the thick portion 5 together by welding or press fitting and using a screw 12. A plurality of cutting blades (hereinafter referred to as "chips") 13 are joined to the tip of the tube portion 4 to cut a work material such as stone.

In the above-mentioned configuration, the upper end coupling portion of the tube portion 4 that produces maximum torque even when the tip 13 is overloaded by the drilling work is formed thick, so that it can be maintained with sufficient strength. Therefore, it becomes possible to make the tip 13 side for cutting work thinner, and it is possible to make the tip shape in which the flow of cooling water and the discharge of sludge of cutting powder are good. Furthermore, the connecting screws 6 and 7 formed on the thick wall portion 5 can appropriately divide the shank portion 2 and the tube portion 2 into two parts, which is very useful when the cutout piece 15 is clogged. It will be.

In the embodiment, the abutment of the screw coupling portion is performed on the tube side, but the result does not change even if the shank side is abutted.

[0011]

[Effect of the device]

 As described above, according to the present invention, since the upper end portion of the tube portion is configured to be thickly reinforced, the tip side that is responsible for cutting can be formed to have a thinner wall thickness, and the sludge of cooling water or cutting powder can be formed. The effect is that the core bits that can be expected to improve the cutting efficiency by improving the discharge of the steel. In addition, since the thick portion that is the reinforcing portion has a screw connection structure, the shank portion and the tube portion can be divided into two parts, and it is possible to provide a structure that is also effective for taking out cut-out pieces.

[Brief description of drawings]

FIG. 1 is a partially longitudinal side view showing an embodiment of a core bit according to the present invention.

FIG. 2 is a partial vertical sectional side view showing a second embodiment of the core bit according to the present invention.

FIG. 3 is a partial vertical cross-sectional side view showing a third embodiment of the core bit according to the present invention.

FIG. 4 is a partial vertical cross-sectional side view of a conventional core bit upper embodiment.

[Explanation of symbols]

1 is a core bit, 2 is a shank portion, 4 is a tube portion, 5
Indicates a thick wall portion (reinforcing ring) 6 for connecting male screw (screw connecting portion), 7 for connecting female screw (screw connecting portion), and 11 for fixing portion.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Nobuyoshi Tachibana 1060 Takeda, Katsuta-shi, Ibaraki Hitachi Koki Co., Ltd. (72) Hiroyasu Ishikawa 1060 Takeda, Katsuta-shi, Ibaraki Hitachi Koki Co., Ltd.

Claims (5)

[Scope of utility model registration request] 1. A tip tool for a drilling machine for drilling a stone material, a concrete structure, or the like, comprising: a shank portion forming a connecting portion with a drive shaft of the tip tool;
In a core bit consisting of a cylindrical tube portion in which a cylindrical cutout piece can be sequentially housed therein, the shank portion and the tube portion are connected by screw connection, and the tube portion is formed thin. The thin body core bit is characterized in that the screw coupling portion is formed thicker than the tube portion. 2. The shank portion side of the tube portion,
The thin body core bit according to claim 1, wherein a reinforcing ring having a connecting screw is fixed. 3. The thin body core bit according to claim 2, wherein the reinforcing ring is fixedly attached by brazing or welding. 4. The thin body core bit according to claim 2, wherein the reinforcing ring is fixed by press fitting and a set screw. 5. The thin body core bit according to claim 2, wherein a through hole for rotating the tube portion is provided near the screw coupling portion of the tube portion.