Power and free conveyor system utilizing power track and dog elevation to prevent jamming conditions at transfers and switches

摘要

PCT No. PCT/US95/10344 Sec. 371 Date Jul. 30, 1996 Sec. 102(e) Date Jul. 30, 1996 PCT Filed Aug. 14, 1995 PCT Pub. No. WO96/31380 PCT Pub. Date Oct. 10, 1996A power and free conveyor system is provided which utilizes a difference in height between the wipe in power trolley and the wipe out power trolley, with or without a camming down of a retractable wide dog of the free trolley, to allow the wipe in power chain to wipe in over the retractable dog without any possibility of lateral interference. Thereafter the elevation of the wipe in power trolley and the wipe out power trolley are the same. Improved stop device operating to push down the retractable dog and therefore cause disengagement of the retractable dog from the power chain dog are also provided.