JPH03101609U

JPH03101609U -

Info

Publication number: JPH03101609U
Application number: JP1067890U
Authority: JP
Priority date: 1990-02-06
Filing date: 1990-02-06
Publication date: 1991-10-23

Description

[Brief explanation of drawings]

第１図は本考案の拡径ドリルを表わす全体の正
面図、第２図は同縦断面図、第３図は他の位置で
の同縦断面図、第４図、第５図は本考案の拡径ド
リルによる使用状態図、第６図は従来技術を表わ
す組立図である。２０……ドリル本体、２１……シヤンク、２２
……押出しピン、２３……中筒、２４……ねじ部
、２５……突出リング、２６……コイルばね、２
７……長孔、２８……連結ピン、２９……ドリル
筒、３０……止ピン、３１……第２の連結ピン、
３２……切刃、３３……外筒、４０……コンクリ
ート壁、４１……孔。 Fig. 1 is a front view of the entire diameter expanding drill of the present invention, Fig. 2 is a longitudinal sectional view of the same, Fig. 3 is a longitudinal sectional view of the same at another position, and Figs. 4 and 5 are the invention of the invention. FIG. 6 is an assembly diagram showing the prior art. 20...Drill body, 21...Shank, 22
...Extrusion pin, 23...Middle tube, 24...Threaded portion, 25...Protrusion ring, 26...Coil spring, 2
7...Long hole, 28...Connection pin, 29...Drill tube, 30...Stop pin, 31...Second connection pin,
32...cutting blade, 33...outer cylinder, 40...concrete wall, 41...hole.

Claims

[Claims for Utility Model Registration] (1) A drill body connected to a rotating tool, a middle cylinder rotatably and slidably connected to the outside of the drill body, and a middle cylinder at the tip of the middle cylinder. a drill tube which is connected to the drill tube so as to be rotatable therewith and is divided in the axial direction and has a cutting edge at its tip; an extrusion pin provided integrally with the drill body and facing inside the tip of the drill tube; A diameter expanding drill comprising a spring means provided between the inner cylinder and the spring means for biasing the drill body toward the rotary tool attachment part. (2) The drill barrel is split into two in the axial direction, and the proximal end is fixed to the middle barrel with a stop pin, and is rotatably coupled with the middle barrel by a removable connecting pin at a position offset from the stop pin in the circumferential direction. The diameter expanding drill according to claim 1, characterized in that: (3) The tip of the drill barrel is formed with an inner tapered portion having a smaller diameter toward the tip opening, and the ejector pin is formed with a sharpened end portion where the tip becomes narrower. diameter expansion drill.