Cutting by use of rotating axially moving tool – With work-engaging structure other than tool or tool-support – Magnetic or suction means
Patent
1975-01-23
1976-07-13
Simpson, Othell M.
Cutting by use of rotating axially moving tool
With work-engaging structure other than tool or tool-support
Magnetic or suction means
B23B 3914
Patent
active
039690369
ABSTRACT:
A portable magnetic drill unit having a work surface engaging base formed as an electromagnet and a spring biased bearing ball thereon for elevating the rear end of the base slightly above the work surface to enable the unit to be easily moved along the work surface to the desired location for drilling a hole. The strength of the spring is correlated to the weight of the drill unit and the strength of the electromagnet such as to support the unit in a slightly elevated position when the electromagnet is de-energized and to compress when the electromagnet is energized so as to allow the bottom face of the base to contact and magnetically adhere to the support surface.
REFERENCES:
patent: 2289458 (1942-07-01), Rodgers
patent: 2818655 (1958-01-01), DeGaston
patent: 3049031 (1962-08-01), Carstens
patent: 3491995 (1970-01-01), Taraba
patent: 3728027 (1973-04-01), Watanabe
Briggs William R.
Simpson Othell M.
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