Drill braking system

Details Drill braking system Drill braking system

1985-12-02

1987-03-17

Briggs, William R.

Cutting by use of rotating axially moving tool

With randomly-actuated stopping means

Responsive to condition of tool or tool-drive

318285, 408 7, 408 9, 409134, B23B 4720

Patent

active

046503757

ABSTRACT:
An electric drill safety device is provided for dynamically braking a drill when there is contact between the drill bit and an electrically conductive material. A first direction voltage is applied to the motor winding to turn the motor forward. When contact is detected between the drill bit and an electrically conductive material, voltage to the windings is discontinued momentarily and thereafter a reverse direction voltage is provided to the motor windings for a predetermined time.

REFERENCES:
patent: 2747154 (1956-05-01), Abrams
patent: 3008074 (1961-11-01), Gregory
patent: 3868035 (1975-02-01), Broyles
patent: 3871536 (1975-03-01), Brown
patent: 4104571 (1978-08-01), Gurwicz et al.
patent: 4329771 (1982-05-01), Eto et al.
patent: 4396322 (1983-08-01), Nomura et al.

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