Drill braking system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 17, 1987
Grant Date -
N/A
app pub date -
Dec 2, 1985
filing date -
Dec 2, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Family
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Cited Art Landscape
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