Drilling machine

Details Drilling machine Drilling machine

1983-04-05

1985-12-17

Weidenfeld, Gil

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

318434, 340648, 340664, 340680, 361 24, 361 96, 408 6, 408 9, 408 16, H02H 7085, B23B 4724

Patent

active

045595771

ABSTRACT:
A drilling machine including an electric drill being selectively fixed at a desired angle with respect to a workpiece and a manual feed handle for moving the electric drill toward and away from the workpiece. A control circuit for the electric drill is provided having a sensor member being operatively connected in said control circuit for detecting a load applied on the electric drill. An alarm member is operatively connected in the control circuit for sending out a signal when a load signal exceeding a first reference level is detected. A switch is operatively connected in the control circuit for deenergizing said control circuit for the electric drill when a load signal exceeding a second reference level is detected.

REFERENCES:
patent: 3248629 (1966-04-01), Reynolds
patent: 3259023 (1966-07-01), Rieger et al.
patent: 3516327 (1970-06-01), Wilson
patent: 3545310 (1970-12-01), Porath et al.
patent: 3809985 (1974-05-01), Krause et al.
patent: 3845373 (1974-10-01), Totsu et al.
patent: 4240072 (1980-12-01), Fowler

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