Abstract: A roller chain conveyor including detachable, snap-on, top-plate assemblies having spaced apart, guide plate members adaptable to overlap the outer ends of connecting pins, so as to avoid contact thereof with laterally disposed guide tracks, especially during operation of the conveyor along curvilinear paths of travel in which transverse forces act on the roller chain. The absorption of the transverse forces occurs over guide plates that overlap the roller chain conveyor. The assemblies include a plurality of resilient, spring-like tongue members disposed about each guide plate member, the tongue members having recesses formed therein to receive in holding engagement a portion of the circumferential surface of each of the connecting pins. This arrangement, whereby there is provided a distinct, rigid, separate guide plate member and a resiient spring-like tongue member, provides a simple device for attachment and removal of the snap-on top plate assemblies to and from the roller chain.