AN INCLINED POWER-DRIVEN CONVEYOR OF THE TYPE HAVING A PLURALITY OF ROTATABLE, ARTICLE-TRANSPORTING ROLLERS POSITIONED ABOUT CHAIN-DRIVEN AXLES DISPOSED TRANSVERSELY OF THE CONVEYOR, WHEREIN A LONGITUDINALLY-OSCILLATABLE PAWL MEMBER AND A RATCHET MEMBER ARE ENCLOSED WITHIN THE RESPECTIVE ROLLERS FOR RESTRAINING DOWNWARDLY-DIRECTED ROTATION OF THE LOAD-BEARING SURFACES OF SAID ROLLERS, AND FOR ALLOWING UPWARDLY-DIRECTED FREE ROTATION OF SUCH ROLLER SURFACES.