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:
Jun. 17, 2003
Filed:
Jul. 19, 2001
Applicant:
Inventor:
Osamu Izumisawa, Tokyo, JP;
Assignee:
S.P. Air Kabusiki Kaisha, Nagano, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B25B 1/346 ;
U.S. Cl.
CPC ...
B25B 1/346 ;
Abstract
A pneumatic ratchet drive wrench of the present invention includes a pair of single springs that each bias a corresponding pawl into engagement with an output member and inhibit counter-rotation of the output member opposite the corresponding pawl. The pawl and spring construction allows the wrench head to be smaller than conventional pneumatic ratchet drive wrenches, providing better wrench access into small spaces. The spring is inexpensively formed as one piece of spring wire having independent spring coils for biasing the pawl and inhibiting counter-rotation of the output member.