Tool driving or impacting – Impacting devices – With anvil arranged to transmit torsional impact to tool
Patent
1998-08-28
2000-10-24
Smith, Scott A.
Tool driving or impacting
Impacting devices
With anvil arranged to transmit torsional impact to tool
173169, B25B 1900, B25F 502
Patent
active
061352136
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).
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patent: 5918686 (1999-07-01), Izumisawa
Atlas Copco Tools AB
Smith Scott A.
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