Patent ID: 8047353

Claim:
A conveyor comprising an elongate endless chain and at least one set of devices for effecting incremental movements of said chain in a direction longitudinally along said chain, said set of devices comprising a first device including a cylinder having an extendable and retractable rod adapted for engaging and disengaging said chain wherein said cylinder is positioned to effect engaging and disengaging said chain by said rod, and a second device positioned and attached to said first device in a manner to effect movement of said first device from a first position to a second position while said first device rod is engaged to said chain thereby to effect an incremental movement of at least a portion of said chain in a direction longitudinally along said chain and in a manner to effect retraction of said first device to the first position while said first device rod is disengaged from said chain thereby to position said first device in a position to effect another incremental movement of at least a portion of said chain in a direction longitudinally along said chain.