Mechanical-emergency system between vehicle service brake foot pedal and parking brake

Claim 1

A normally quiescent automatically energized manually controlled emergency brake system for a vehicle having a service brake operator and a parking brake apparatus, said system comprising a mounting shaft, an actuator rotatably mounted on said shaft and conncted to said service brake operator for back and forth angular movement along a path corresponding to movement of said operator, a follower rotatably mounted on said shaft independently of and adjacent to said actuator for movement longitudinally of said shaft toward and away from said actuator into and out of said path transversely thereof and along said path in following relation with said actuator, follower connection means connecting said follower to said parking brake apparatus for operating the latter upon movement in said following relation, resiliently yieldable holding means operatively connected to said follower to urge said follower longitudinally of said shaft and normally maintain said follower away from said actuator in position out of said path, sensor means for sensing abnormal service brake operator functioning, activator means responsive to said sensor means to urge said follower longitudinally of said shaft against said holding means and into said path and said following relation to operate said parking brake system upon failure of said service brake, and limit means operative upon predetermined yielding of said holding means to limit the restoration thereof and maintain said follower in said following relation.