Concept: The overrunning clutch would be integrated within the wheel hub. An overrunning clutch typically consists of inner and outer races with rolling elements (such as rollers or splines) that allow rotation in one direction (forward) and lock in the opposite direction (backward) operation.
Forward Direction: During forward rotation of the wheel, the rolling elements within the overrunning clutch engage with the inner and outer races, allowing the wheel to turn freely. The spring loaded rack system continues to propel the trolley.
Backward Direction: When the wheel attempts to rotate backwards, the rolling elements in the clutch disengage or lock, preventing backward movement but allowing the inner race (connected to the wheel) to continue rotating forward.
Note: A flywheel could be introduced with the clutch to enable the wheel to continue rotating during the backward stroke of the SCM, but this will not be done during an initial design. A damper-spring mechanism could also be used to ensure smooth operation if no flywheel is used. This is left for later design iterations.
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