Abstract: A wrench for applying torque to a member that rotates, such as the rotary operating member by which to open the discharge gate for a railroad hopper car, the wrench being provided with a hollow hub or sleeve that fits over the rotary member and having means for locking it to the periphery of such member. A reduction-gear train multiplies the input force, the force exerted by the wrench on the member to be rotated, as well as the forces of reaction, being directly in line with the input force so that there is no tendency for the wrench to twist. Specific means are disclosed for locking the hub of the wrench to the rotary member and comprise a hook-shaped dog that is pivoted on the hub so that the hooked end of the dog extends through a lateral opening in the hub into engagement with a hole or recess in the periphery of the member. A release lever is provided for facilitating withdrawal of the dog to a retracted position and for holding it in that position while the wrench is being applied or removed.

Abstract: A device for mechanically connecting hopper car unloading boots to the discharge outlets on the car for unloading bulk material from the car, in which a pair of coupling frames are supported on a lift platform and interlinked with each other so that they can be spread apart into position under the outlets on the car and drawn together between the tracks by moving either one of the coupling frames, such movement automatically resulting in the other coupling frame being moved a corresponding amount in the opposite direction. In addition the lift platform is prevented from accidentally lowering out of engagement with the outlets by a hydraulic lock that is built into the lift cylinder.