Spring set centrifugally released brake

Details Spring set centrifugally released brake Spring set centrifugally released brake

1998-03-17

1999-11-23

Butler, Douglas C.

Brakes

Operators

Speed-responsive

188166, B60T 872

Patent

active

059883286

ABSTRACT:
A spring-set, centrifugally released brake for a linear actuator is provided. The brake includes a drum or ring that is disposed radially outward of a shaft extending from the actuator's motor. The brake also includes a drive plate that is mounted to the shaft for rotation therewith. The brake further includes a pair of brake shoes disposed radially outwardly of the shaft and having radially outer portions disposed radially outwardly of the drum. Finally, the brake includes a pair of compression springs disposed within hollows in the drive plate. The springs are supported at one end by the drive plate and at the other end by one of the brake shoes. The springs urge the brake shoes radially inward when the actuator is at rest and cause the radially outer portions of the brake shoes to engage a radially outer surface of the drum. Upon rotation of the shaft by the actuator motor, a centrifugal force is imparted to the brake shoes and the radially outer portions of the brake shoes move radially outward--disengaging from the radially outer surface of the drum--to release the brake.

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