Patent ID: 6338605
Filing Date: 2002-01-15
Classification: B61D,Y10S

Abstract:
A tractor for unloading a trailer from a railcar that is supported by a locked stanchion having a trigger, the tractor comprising:a trigger actuator fixably mounted to the tractor; at least one bumper on the tractor having an extended position and a retracted position, when the at least one bumper is in the extended position the at least one bumper prevents the trigger actuator from engaging the trigger when the tractor moves towards the locked stanchion, and when the at least one bumper is in the retracted position the at least one bumper permits the trigger actuator to engage the trigger and unlock the stanchion when the tractor moves adjacent the stanchion, thereby allowing the weight of the trailer to collapse the stanchion, which shifts the weight of the trailer from the stanchion to the tractor; and a motor coupled to the at least one bumper to operate the at least one bumper between the extended position and the retracted position.