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1. (WO2013145685) FASTENING TOOL DRIVEN BY COMPRESSED AIR

Pub. No.:    WO/2013/145685    International Application No.:    PCT/JP2013/001996
Publication Date: Fri Oct 04 01:59:59 CEST 2013 International Filing Date: Tue Mar 26 00:59:59 CET 2013
IPC: B25C 1/04
Applicants: HITACHI KOKI CO., LTD.
Inventors: MIYAZAKI, Akiyuki
OOUCHI, Haruhiko
HIRAI, Shouichi
Title: FASTENING TOOL DRIVEN BY COMPRESSED AIR
Abstract:
Provided is a fastening tool which can improve an operation response performance of a closing member operated for reducing an air amount consumed in a first air chamber. The fastening tool includes: a cylinder 18 provided inside a main body 11; a piston 26 provided inside the cylinder 18; a driver blade 26b coupled to the piston 26; a first air chamber 28 and a second air chamber 36 provided inside the cylinder 18; and a fifth passage 35 which supplies compressed air in a pressure accumulating chamber 15a to the first air chamber 28, the fastening tool further includes: a third air chamber 37 in which air flows when compressed air in the pressure accumulating chamber 15a is supplied to the first air chamber 28; and a head valve 21 which is operated by air pressure in the third air chamber 37 so that the fifth air chamber 35 is closed, and the head valve 21 is shorter than the cylinder 18.