Safety switch for drill press using chuck key

Details Safety switch for drill press using chuck key Safety switch for drill press using chuck key

1975-04-17

1976-04-13

Spruill, Robert L.

Electricity: circuit makers and breakers

Special application

Actuated concurrently with operation or use of art device

200 42R, 200 52R, 408710, H01H 2706

Patent

active

039506258

ABSTRACT:
The subject safety switch insures that the chuck key has been removed from the chuck prior to operation of the drill press. A slide "on-off" switch is engaged by a guard that prevents the sliding movement necessary to turn the switch on. The guard of the safety switch is not part of the electrical circuit, but rather is a mechanical addition which prevents operation of the electrical circuit. The socket is formed in the housing adjacent the guard. The chuck key is inserted into the socket to engage the guard and remove it from the path of travel of the switch to permit the switch to be shifted between the on and off position. The socket is keyhole shaped, whereby insertion of the chuck key therein will force the chuck to seat within the lower narrower aperture thereof.

REFERENCES:
patent: 2597969 (1952-05-01), Barton
patent: 2666104 (1954-01-01), Griffin
patent: 2713407 (1955-07-01), Miller
patent: 2807732 (1957-09-01), Kurtovich
patent: 3761654 (1973-09-01), Davis
patent: 3769473 (1973-10-01), Lay

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