Pneumatically powered hand tool with speed-control governor

Details Pneumatically powered hand tool with speed-control governor Pneumatically powered hand tool with speed-control governor

1976-08-03

1977-11-08

Staab, Lawrence J.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

137 53, 415 39, 415 44, 418 43, B23Q 5027

Patent

active

040571130

ABSTRACT:
A pneumatic hand tool comprises a housing having a compressed-gas inlet and provided with a pneumatically powered motor which carries on one side a tool holder such as a chuck and on the other side a governor. A speed-control valve is operated by the governor and can close a first air passage between the inlet and the motor to maintain the motor speed below a predetermined limit. Another passage is provided which bypasses the governor-controlled speed-control valve and a valve is provided in this bypass conduit which is openable in order to allow the hand tool to operate at a speed substantially above the governor-established speed.

REFERENCES:
patent: 228772 (1880-06-01), Michener
patent: 270546 (1883-01-01), Hunt
patent: 1009213 (1911-11-01), Augustine
patent: 2903003 (1959-09-01), Walton
patent: 3697189 (1972-10-01), Tibbott
patent: 3740174 (1973-06-01), Amtsberg
patent: 3785442 (1974-01-01), Amtsberg et al.
patent: 3811514 (1974-05-01), Blomberg et al.
patent: 3904305 (1975-09-01), Boyd

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