Overspeed control means for pneumatic tools

Details Overspeed control means for pneumatic tools Overspeed control means for pneumatic tools

1980-01-07

1981-07-14

Nilson, Robert G.

Fluid handling

Speed responsive valve control

Speed change and excess speed valve control

137 57, 418 41, 418 43, F01C 2112

Patent

active

042781035

ABSTRACT:
An overspeed control means for pneumatic tools which includes a split ring valve slidably arranged in a circumferential groove formed in a cage member affixed to the rotor shaft of the tool. When the cage member exceeds a predetermined rotational speed, the ring valve will expand and be moved, by pressure differential acting thereupon, into engagement with a valve seat to block holes in a flow circuit for pneumatic medium being conducted to the rotor of the tool, whereby tool operation is terminated.

REFERENCES:
patent: 3020920 (1962-02-01), Kaman
patent: 3257913 (1966-06-01), Broom
patent: 3552410 (1971-01-01), Amtsberg
patent: 3749530 (1972-01-01), Amador
patent: 3923429 (1975-12-01), Schaedler
patent: 3930764 (1976-01-01), Curtiss
patent: 4184819 (1980-01-01), Clark

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