Abstract: A shock absorber in a compound trolley conveyor, including two cylinders disposed between a foremost trolley and a front trolley of the compound trolley conveyor and connected together face to face with each other, and two pistons inserted into the cylinders respectively and interconnected. When an impact force is applied to a carrier member at the time of connection or disconnection between the trolley connected to the carrier member and a drive chain, one piston moves in a direction to compress the air in the associated cylinder, while the other piston moves in a direction to withdraw or exhaust air from the associated cylinder. By such air compressing and withdrawing actions, the impact energy is absorbed to buffer the impact force. The compressed air in one cylinder slowly flows out to the exterior from a piston-cylinder gap, while the outside air slowly flows into the other cylinder through a piston-cylinder gap.

Abstract: A backstop device of a carrier in a trolley conveyor having the carrier riding on a traveling rail in and out of engagement with a travelling chain. The carrier has traveling rollers with backstop rings fixedly and interiorly mounted thereupon. Each of the backstop rings has a multitude of backstop holes on the circumference of the peripheral surface of the backstop rings for engagement with a pawl.