Safety interlock for electro-magnetic drill stand

Details Safety interlock for electro-magnetic drill stand Safety interlock for electro-magnetic drill stand

1980-02-29

1981-07-14

Hinson, Harrison L.

Cutting by use of rotating axially moving tool

With work-engaging structure other than tool or tool-support

Magnetic or suction means

408710, B23B 3900

Patent

active

042783712

ABSTRACT:
An electromagnetic drill stand, of the type having a drill driven by an electric motor and mounted on a stand provided with an electromagnetic coil in the bottom of the stand to secure the stand to ferromagnetic material when the coil is energized, is provided with switch means preventing operation of the motor when the coil is not energized, said switch means being mounted in proximity to said coil and responsive to the magnetic flux of the coil for controlling the power supply to the motor and operative to interrupt the power supply in absence of a predetermined flux density.

REFERENCES:
patent: 2409397 (1946-10-01), Sheehan et al.
patent: 2887910 (1959-05-01), Williamson, Jr.
patent: 2932194 (1960-04-01), Buck
patent: 2977825 (1961-04-01), Buck
patent: 3371257 (1968-02-01), Warren et al.
patent: 3814876 (1974-06-01), Biafore

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