Automatic shut-off valve for power tools

Details Automatic shut-off valve for power tools Automatic shut-off valve for power tools

1979-01-31

1981-01-06

Feldbaum, Ronald

Tool driving or impacting

Passage in manipulating handle for drive motor motive fluid

Motive fluid control valve in handle passage

91 59, 173 12, B23B 4504, B27C 308

Patent

active

042431115

ABSTRACT:
A fluid-actuated shut-off valve for a fluid-powered tool such as a wrench including a spool valve urged to open position by a spring and having respective valve-operating surfaces subject to both regulated inlet and exhaust pressures in the tool. The valve operating surfaces and spring are arranged so the valve is thrown to its closed position by a combination of a constant regulated control pressure and the drop in exhaust pressure as the tool motor slows down and stalls under load.

REFERENCES:
patent: 2814277 (1957-11-01), Jimerson
patent: 3493056 (1970-02-01), Boeger et al.
patent: 3608647 (1971-09-01), Borries
patent: 3656560 (1972-04-01), Catterfeld et al.
patent: 3667345 (1972-06-01), Schaedler et al.
patent: 3696834 (1972-10-01), Vonhoff
patent: 3920088 (1975-11-01), Dudek
patent: 4023627 (1977-05-01), Madison et al.
patent: 4106750 (1978-08-01), Karden et al.

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