Patent ID: 8307956

Claim:
A wheel restraint system to engage a wheel of a vehicle at a loading dock, the wheel restraint system comprising: an anchor mountable to the loading dock; a wheel chock movable to a holding position and a release position such that in the holding position, the wheel chock is to obstruct the wheel, and in the release position, the wheel chock is clear of the wheel; an arm to couple the wheel chock to the anchor; a spring coupled to the arm; and a spring release device to couple the spring to the arm, the spring release device, when activated, to move relative to the arm between a first position to stress the spring when the wheel chock is in the release position and, when deactivated, a second position to relax the spring when the wheel chock is in the holding position, the spring is to support more of the weight of the wheel chock when the spring release is in the first position to stress the spring than when the spring release is in the second position to relax the spring.