Variable ratio park brake with slack adjust

摘要

A brake operator for a vehicle having a cable-operated park brake mechanism comprises a pedal lever pivotally mounted on a mounting bracket for movement between a brake-released position and a range of brake-applied positions, and a lever latch for selectively releasably latching the lever in any selected brake-applied position. The cable is attached to the lever by a reel having a circular cable-engaging surface, the reel being pivotally mounted on the lever eccentrically of the lever pivot and being pivotable to wrap the cable onto the circular surface to move the cable relative to the lever to remove slack. The eccentric mounting provides a predetermined ratio of cable travel per unit of lever movement. The cable tangentially engages the reel surface at the same location on the lever in all positions of the reel to provide the same predetermined variable ratio in all positions of the reel. Slack take-up is provided by a sector gear carried by the reel, a spring biasing the reel in slack take-up direction, and a pawl carried by the lever and engageable with the sector gear teeth to latch the reel in a fixed position during lever movement to brake-applied position.