Patent ID: 6883579

Claim:
A movable barrier system comprising: a moveable barrier shiftable between open and closed positions; a drive shaft driven for rotation to shift the barrier between one of the open and closed positions to the other of the open and closed positions; an actuator assembly including a flexible actuator connected between the drive shaft and the barrier for shifting the barrier from the one position to the other upon rotation of the drive shaft; a biasing mechanism including a resilient biasing member between the flexible actuator and the barrier that exerts a generally linear biasing force in a predetermined linear direction for keeping the flexible actuator tensioned as the barrier is shifted; and a stop assembly of the biasing mechanism that keeps resilient flexing of the biasing member and shifting of the barrier absent drive shaft rotation from the other position toward the one position to a predetermined limited amount, the stop assembly including connections to the biasing member to resiliently flex the member along the linear direction upon shifting of the barrier absent drive shaft rotation, and the resilient biasing member comprises a compression spring, and the stop assembly includes a pair of pull devices with one of the pull devices operatively connected to the flexible actuator and the other of the pull devices operatively connected to the barrier, the pull devices and compression spring being configured to compress the spring therebetween when the barrier is shifted from the closed position toward the open position absent drive shaft rotation until the barrier reaches the predetermined limited amount of shifting.