Bidirectional pneumatic impact wrench

Details Bidirectional pneumatic impact wrench Bidirectional pneumatic impact wrench

2005-04-26

2005-04-26

Smith, Scott A. (Department: 3721)

Tool driving or impacting

Impacting devices

With anvil arranged to transmit torsional impact to tool

C173S168000, C173S169000

Reexamination Certificate

active

06883619

ABSTRACT:
A bidirectional pneumatic impact wrench has a pneumatic motor and an air control valve. The pneumatic motor has a forward air inlet and a reverse air inlet. The air control valve directs compressed air selectively into either the forward air inlet or the reverse air inlet to change the direction of rotation of the pneumatic motor and includes a rotatable shaft. The shaft has an exterior surface and a spiral forward air groove and reverse air groove that are symmetrically defined in the exterior surface to direct the compressed air efficiently. The air control valve is simple to fabricate and directs the compressed air efficiently into the pneumatic motor to improve power and efficiency of the pneumatic motor.

REFERENCES:
patent: 3951217 (1976-04-01), Wallace et al.
patent: 4109735 (1978-08-01), Bent
patent: 4418764 (1983-12-01), Mizobe
patent: 4462282 (1984-07-01), Biek
patent: 5083619 (1992-01-01), Giardino et al.
patent: 5346024 (1994-09-01), Geiger et al.
patent: 6161627 (2000-12-01), Seith et al.
patent: 6634438 (2003-10-01), Pusateri et al.

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