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:
Oct. 24, 2000
Filed:
Aug. 28, 1998
Knut Christian Schoeps, Tyreso, SE;
Atlas Copco Tools AB, Nacka, SE;
Abstract
A pneumatic power wrench having a rotation motor supported in a housing (11), an output shaft (13) for connection to a screw joint to be tightened, a pressure air inlet passage (14) controlled by a throttle valve (18), and an exhaust air outlet passage (16) including an automatic outlet flow restricting valve (26,28,43), wherein the outlet flow restricting valve (26,28,43) comprises a valve seat (26), a freely movable valve element (28,43) co-operating with the seat (26), a first activation surface (45) on the valve element (28,43) communicating with the inlet passage (14) downstream of the throttle valve (18) for exerting a motor feed pressure responsive actuating force on the valve element (28,43) in a direction away from the seat (26), and a bias spring (49) and a second outlet flow responsive activation surface (33) for actuating the valve element (28,43) in a direction toward the seat (26). The flow restricting valve (24,43) is included in an exhaust air outlet deflector (20) attached to the housing (11).