This invention relates to power and free accumulation conveyors in which an element of the power conveyor when it overtakes an unrestrained halted element of the free conveyor automatically connects for movement with said free element and also releases said free element when said free element contacts a stop placed in its path or another free element which has been stopped in its path, for example, in an accumulation area. The driving dog, which is mounted on the power element, is pivotable about a vertical axis to override selective dogs on the free element through a camming mechanism.
A conveyor system having pusher assemblies on a driven chain supported above a carrier track along which carriers are propelled with each carrier having a front trolley having a push lug and a rear trolley having a release camming lug. The pusher assemblies include a pivotedly supported front pusher dog assembly and a pivotally supported rear pusher dog assembly with the front pusher dog assembly including a forwardly projecting release blade for releasing the pusher dog from driving engagement with the push lug on the carrier. Provision is also made for accumulation of carriers, batch re-entry of carriers, carrier switchout and control of the carriers when traversing inclines.
