A high speed shuttle conveyor includes two motor-driven belts for moving two carriages forwardly to rapidly propel an article conveyor from a starting position to an ending position. The belt movements are reversed to return the carriages to the starting position. Each carriage has a retractable pusher...http://www.google.com.au/patents/US5996771?utm_source=gb-gplus-sharePatent US5996771 - High speed shuttle conveyor system
