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US Patent: 1,936,640
Reversible Friction Clutch
Patentee:
Edward M. Pfauser (exact or similar names) - Milwaukee, WI

USPTO Classifications:
192/44, 81/59.1

Tool Categories:
wrenches : ratchet wrenches

Assignees:
Blackhawk Mfg. Co. - Milwaukee, WI

Manufacturer:
Blackhawk Mfg. Co. - Milwaukee, WI

Witnesses:
none listed

Patent Dates:
Applied: Aug. 14, 1931
Granted: Nov. 28, 1933

Patent Pictures:
Edward M. Pfauser patent November 28, 1933
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Description:
Rollers and tapered surfaces provide the frictional engagement. Internal plungers in the head determine which direction of rotation will "bind" the rollers, head and frame. A shifting sleeve moves the rollers in relation to the internal plungers to reverse the direction of the binding action.

Improved by patent no. 2,003,155. These patents were used in the Blackhawk Free Wheel Ratchet.

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