Braking apparatus for stopping a rotating shaft

Brakes – Operators – Speed-responsive

Patent

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Details

188 69, B60T 712

Patent

active

039660273

ABSTRACT:
Electrically actuated safety apparatus for automatically stopping a rotating shaft at a predetermined rotational speed and adapted for use with rotary components such as those of elevator safety brakes. The apparatus comprises a plurality of rigid, circumferentially spaced stopping blocks which rotate with the shaft, a selectively actuable stopping member, and means for automatically moving the stopping member into engagement with one of the stopping blocks or lugs when the shaft reaches a predetermined, unsafe angular velocity. Shaft velocity is electrically monitored by a proximity switch which senses the speed of the rotating stop lugs and provides an output control signal when an unsafe condition is indicated. The stopping member is shifted to a stop position in the path of the rotating stop lugs by the action of a solenoid which is responsive to the control signal from the proximity switch. Manually operable reset means lock the apparatus in a stopped condition to prevent rotation of the shaft until the stopping member has been retracted to its rest position out of the path of the stop lugs. Failsafe apparatus is included to automatically stop the shaft when power is removed from the proximity switch or malfunction thereof otherwise occurs.

REFERENCES:
patent: 2320016 (1943-05-01), Severinghaus
patent: 2511793 (1950-06-01), Telbizoff
patent: 2939555 (1960-06-01), Flury
patent: 3578817 (1971-05-01), Eastcott

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