an elongate drive element movable under power along a longitudinal path a track extending along the path of the drive element a carrier movable along the track and having an extension for driven engagement with the drive element to move the carrier and declutching means for disengaging the carrier extension from the drive element application_number US 29722381 A description referring now more particularly to the drawings and specifically to fig1 thereof the conveyor of the present invention is there generally designated 9 being set up on a supporting surface or floor 11 the conveyor 9 may include an endless drive element or chain 12 which may be of ovaloid configuration in plan view having a pair of generally parallel runs 13 and 14 connected together at opposite ends by turnarounds 15 and 16 extending conformably along and outward of the endless ovaloid drive element 12 may be an endless ovaloid track 20 similar to the drive element 12 track 20 may include a pair of longitudinally extending generally parallel track runs 21 and 22 having their adjacent ends connected together by generally u shaped track sections or turnarounds 23 and 24 as may be seen in fig1 the ovaloid track 20 extends conformably and spacedly about the drive element 12 the track 20 may be formed of rigid upstanding plate material the track runs 21 and 22 having generally parallel substantially coplanar upper edges 30 and 31 while the track.