Abstract: A motorized wide range tow hitch is provided including a mount defining a rearwardly flared recess in which a front-to-rear extending ball hitch mounting arm is disposed for longitudinal shifting relative to the mount between front and rear limit positions and horizontal swinging of the rear end of the arm relative to the mount when the arm is disposed in a position rearward of its forward limit position. Motor drive structure is operatively connected between the mount and the arm for motorized forward retraction of the arm from a rearwardly displaced position to the forward limit position of the arm and the arm and mount include coacting structure for camming the arm to a centered position within the recess responsive to final movement of the arm to a forwardmost retracted limit position.

Abstract: An automatic transmission for a bicycle comprising a sprocket wheel of variable diameter, for receivably engaging a linked bicycle chain, drivingly connected to a bicycle wheel. The diameter of the sprocket wheel can be varied in relation to the angular speed of the bicycle wheel. Variation in the diameter of the sprocket in response to drive pressure applied by the linked bicycle chain is prevented by a locking mechanism.