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1. (WO2018180832) COMPRESSED-AIR-DRIVEN CHISEL

Pub. No.:    WO/2018/180832    International Application No.:    PCT/JP2018/011276
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Fri Mar 23 00:59:59 CET 2018
IPC: B25D 9/00
Applicants: NITTO KOHKI CO., LTD.
日東工器株式会社
Inventors: INAGAKI, Fumio
稲垣 史雄
SHIMADA, Keisuke
嶋田 啓輔
Title: COMPRESSED-AIR-DRIVEN CHISEL
Abstract:
Provided is a compressed-air-driven chisel whereby the diameter of a needle holder can be reduced. In the present invention, an annular recess (22a) for backward movement driving is provided on an outer circumferential surface of a needle holder (22) provide in a cylinder so as to be able to move in an axial direction, and compressed air is supplied to a backward movement drive chamber (26) via the annular recess (22a) for backward movement driving when the needle holder (22) is moved forward.