JPH0174009U

JPH0174009U -

Info

Publication number: JPH0174009U
Application number: JP1987170578U
Authority: JP
Priority date: 1987-11-06
Filing date: 1987-11-06
Publication date: 1989-05-18

Description

[Brief explanation of the drawing]

第１図はこの考案に係るシヤンクにコアドリル
とセンタードリルが取付けられた状態を示した縦
断正面図、第２図はこの考案に係るシヤンクにコ
アドリルとセンターピンが取付けられた状態を示
した縦断正面図、第３図は同底面図、第４図はコ
アドリルの先端部の一部を示した拡大展開図であ
る。１……コアドリルのシヤンク、２……コアドリ
ル、３……センタードリル、４……センターピン
、５……孔、６……押しねじ、７……ねじ孔、８
……環状溝、１０……クリツクストツパー。 Fig. 1 is a longitudinal sectional front view showing a state in which a core drill and a center drill are attached to a shank according to this invention, and Fig. 2 is a longitudinal sectional front view showing a state in which a core drill and a center pin are attached to a shank according to this invention. FIG. 3 is a bottom view of the same, and FIG. 4 is an enlarged developed view showing a part of the tip of the core drill. 1... Core drill shank, 2... Core drill, 3... Center drill, 4... Center pin, 5... Hole, 6... Push screw, 7... Screw hole, 8
...Annular groove, 10...Click stopper.

Claims

[Claims for Utility Model Registration] 1. The shank of a core drill, which has a hole for attaching the base of a center drill, has a screw hole for mounting a push screw to fix the base of the center drill inserted into the hole. When the base of the center pin, which has an annular groove formed near its base end, is inserted into the hole, it removably engages with the annular groove of the center pin to prevent the base of the center pin from slipping out. A shank for a core drill, characterized in that it is provided with a click stopper. 2. The click stopper is screwed into a through hole that is drilled in the shank in the shank transverse direction and reaches the hole for installing the center drill, a ball inserted into the through hole, and a position that closes the mouth of the through hole. and a spring interposed between the ball and the stopper. The scope of the utility model registration claim is that the ball is narrowed to have a diameter slightly smaller than that of the ball, and a portion of the ball is slightly protruded into the hole for installing the center drill due to the spring pressure. A shank of the core drill described in paragraph 1. 3. The core drill is a core drill having an appropriate number of hard cutting blades attached to its tip, and the hard cutting blades are made of a large number of cemented carbide metal cutting blades attached to the tip at appropriate intervals. Consisting of a cutting blade and a plurality of cutting blades, each of which is arranged between any of the above-mentioned cemented carbide cutting blades and which is also attached to the tip of the core drill and whose cutting action portion at least is made of diamond. The core drill according to claim 1 of the utility model registration claim.