| 摘要 |
A speed control device for controlling the speed of a transport vehicle rolling on a rail track, especially for use in a shelf storage system in which a pair of spaced apart rails form part of the structure of a warehouse shelf and constitutes the supporting and guiding track for the vehicle, the transport vehicle being supported on the rails and wherein a rotating braking and accelerating member is provided for the vehicle. The speed control device for driving the braking and accelerating member drives at a predetermined speed. The braking and accelerating member consists essentially of a spring-tensioned endless belt, a fixed subframe, bracket support member, and a spring member. The belt is resiliently supported on the fixed subframe and is able to move from a rest position which is out of engagement with the driving member but in the path of said vehicle to a working position which is in engagement with the driving member and in frictional engagement with the vehicle. The resilient movement of the belt from the rest position to the working position and back is effected by the passing vehicle itself and is opposite to the force of said spring members. Roller members are provided including axles which rests upon openings in the bracket support, the necks of the axles resting against the upper portions of the openings in the bracket support to provide braking and accelerating members. A disc on the ends of said axles prevent the spring from jumping off the necks of the axles.
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