| 摘要 |
A power and free conveyor system comprising a plurality of carriers, a carrier track comprising an upper run, a lower run, and connecting portions connecting the upper and lower runs, such that the carriers can be moved along the upper run and thereafter through a first connecting portion along the lower run in inverted position and returned to the upper run through a second connecting portion. A powered conveyor is associated with the upper and lower runs and connecting portions and has pushers thereon for engaging the carriers. Each carrier has a first pusher dog thereon movable downwardly when the carrier moves along the upper run for engagement with a pusher of the conveyor and movable upwardly when the carrier is moving along the lower run so that it is out of engagement with the pusher of the conveyor. Each carrier has a second pusher dog thereon which is normally out of engagement with the pusher of the conveyor when the carrier is moved along the upper run and is moved into engagement with the pusher of the conveyor when the carrier is moved along the lower run. Each carrier pusher dog is operable upon engagement with an obstacle for movement out of engagement with the pusher of the conveyor.
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