US 4,326,466 A · Anti-back up device for conveyor trolley

Abstract

A conveyor system comprising a track along which a plurality of carriers are movable. Each carrier includes a pusher dog that is movable into and out of position for engagement by a pusher lug of a conveyor chain. Each carrier is provided with wheels, and a pivoted anti-back up cam member which is normally urged by gravity in a direction to hold surfaces thereof out of engagement with the track. Each carrier further includes an actuator operable when it engages a preceding carrier or an obstacle to move the pusher dog out of engagement with the pusher lug. A spring is provided between the actuator and the anti-back up cam member so that when the actuator is operated to move the pusher dog, the cam member frictionally engages the track.

Claims14

Dependent claims

A power and free conveyor system comprising

a track,
at least one carrier movable along said track,
a conveyor for driving said carrier along said track,
pusher means on said carrier movable into and out of driving engagement with said conveyor,
operating means comprising a lever pivoted intermediate its ends on said carrier and having one end extending forwardly and the other end extending rearwardly, said lever being operable to move said last mentioned pusher means out of driving engagement with said conveyor upon contact with a preceding carrier or an obstacle,
an anti-back up cam member movably mounted on said carrier and adapted to be moved into and out of engagement with said track,
tension spring means providing a yielding connection between said cam member and said lever such that when said lever operates to move said pusher means out of engagement with said conveyor, said cam member is yieldingly urged into engagement with said track.

4 more elements

Dependencies are inferred from the claim text.

Anti-back up device for conveyor trolley

Life of this patent

Anti-back up device for conveyor trolley

Life of this patent

Abstract

Claims14