Single rocker joint drive chain

A rocker joint drive chain comprising a plurality of apertured link members assembled end to end with overlapping end portions and registering apertures interconnected by pivot pins extending through the apertures and constituting pitch centers for a pivotal rocking action of the links on the pins, said apertures being substantially larger than the pins to provide clearance for the rocking action and for removal of the pins, said pins having end portions larger than the pin portions between their end portions and constituting chain transverse assembly retention means, said end portions also being smaller than the link apertures to facilitate insertion and removal therethrough, said pins being free to rotate independently of the link rocking action, the pin centers thereof constituting the center to center pitch dimension of an assembled chain.