Process of forming openings

Details Process of forming openings Process of forming openings

1987-09-17

1989-02-28

Schmidt, Frederick R.

Stone working

Miscellaneous

408 1R, 408 7, 408 12, 408 15, 29407, 29593, 175 50, B28D 100, B23B 3500

Patent

active

048075876

ABSTRACT:
In a process using a hand-held drilling device for forming openings in a construction material containing steel reinforcing members, during the drilling step the electrical resistance between the drill bit and the reinforcing members is continuously measured. If the drill bit contacts the reinforcing member the measuring circuit is shorted out and the electrical resistance drops. The drop in resistance can be used as a signal for cutting power to the drilling device or for declutching or braking the device.

REFERENCES:
patent: 2409397 (1946-10-01), Sheehan
patent: 2747154 (1956-05-01), Abrams
patent: 4219776 (1980-08-01), Arulanandan

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