The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 01, 1980
Filed:
Jan. 05, 1978
Applicant:
Inventor:
Hiroshi Okada, Suita, JP;
Assignee:
Nippon Pneumatic Manufacturing Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B25D / ;
U.S. Cl.
CPC ...
173119 ; 91300 ; 173134 ; 173D / ;
Abstract
An improved impact tool which has a cylinder, a liner mounted therein, a piston mounted in the liner and reciprocated by gas and hydraulic pressure, and a tubular valve slidably mounted on the liner for controlling a hydraulic circuit. The tubular valve is hydraulically pushed up and down without a spring being used. No gas accumulator is used. Thus, the impact tool has a simple construction and is durable.