JPS58164612U

JPS58164612U - drilling tool

Info

Publication number: JPS58164612U
Application number: JP6109882U
Authority: JP
Inventors: 英俊前田
Original assignee: 太平洋セメント株式会社; 小野田エ−・エル・シ−株式会社
Priority date: 1982-04-28
Filing date: 1982-04-28
Publication date: 1983-11-02

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図ａ　”　ｃは底部より開口部の径が小さい孔の断
面形状を夫々示す断面図、第２図〜第６図すは本考案の
一実施例に係り、第２図は孔あけ工具の縦断面図、第３
図は中心棒先端の内刃を示す正面図、第４図は第２図中
のＩ−Ｔ断面図、第５■はドリル先端部の正面図、第６
図ａおよびｂは孔あけ工具の動作を説明する縦断面図で
ある。図面中、１．　２．　３は底部より開口部の径の小さな
有底の孔、４は中心棒、４ａはピン支持部、５はピン、
６は内刃、７はフランジ、８は突起、９はドリル、９ａ
は切刃、１０は押出しネージ、１１はスリット、１２は
スプリング、１４は上部　　。スプリング押え、１６は下部スプリング押え、１６ａは
溝、１８は押え部材である。Figures 1a and 1c are cross-sectional views showing the cross-sectional shape of a hole whose opening diameter is smaller than that of the bottom, Figures 2 to 6 relate to an embodiment of the present invention, and Figure 2 shows a drilling tool. Longitudinal cross-sectional view, 3rd
The figure is a front view showing the inner cutter at the tip of the center rod, Figure 4 is a sectional view taken along IT in Figure 2, Item 5 is a front view of the drill tip,
Figures a and b are longitudinal sectional views illustrating the operation of the drilling tool. In the drawing: 1. 2. 3 is a bottomed hole with an opening diameter smaller than the bottom; 4 is a center rod; 4a is a pin support; 5 is a pin;
6 is an inner blade, 7 is a flange, 8 is a protrusion, 9 is a drill, 9a
10 is a cutting blade, 10 is an extrusion screw, 11 is a slit, 12 is a spring, and 14 is an upper part. A spring presser, 16 is a lower spring presser, 16a is a groove, and 18 is a presser member.

Claims

[Scope of utility model registration request]

A drill that has a center rod whose base end is gripped by the drill mounting part of an electric drill, a hollow space into which the tip of the center rod can be inserted, an interior formed at the base end surface, and a spiral cutting edge on the outer periphery. are inserted and connected so as to be integrally rotatable in the circumferential direction and capable of reciprocating for a predetermined distance in the axial direction, and a spring is interposed between the center rod and the drill that always urges the drill outward, and the outer periphery of the drill is A holding member is attached to set the cutting depth of the hole, and an inner cutter is attached to the tip of the center rod inserted into the drill so as to be able to swing freely, and the back of the inner cutter is used to move the center rod toward the tip. A drilling tool characterized in that an extrusion protrusion that comes into contact with the extrusion protrusion protrudes into the hollow part of the drill, and the drill is provided with a slit through which an inner cutter pushed out by the extrusion protrusion enters and exits.