A center link pusher dog assembly for power and free conveyors includes a pusher dog member with a mounting base and a pusher dog projection upstanding therefrom. The mounting base has depending lugs and a rear shoulder to engage an abutment formed by a reduced central area of a center link of a conveyor chain. A bore through the pusher dog member recevies a bolt for clamping a center link between the pusher dog member and a conventional chain support type of power trolley. The lugs engage upsta...

A trolley stop assembly is provided for use with an inverted power and free conveyor system having a trolley member driven along a track. A depending trolley dog is engaged by drive dogs on a drive mechanism for pushing the trolley along the track and is movable between upper and lower positions for disengagement and engagement with the drive dogs. The assembly includes a stop arm pivotally mounted within the conveyor system for pivoting about a horizontal axis. Provisions are made for lifting t...

A positive retraction trolley stop mechanism is provided for a power and free conveyor system having a trolley member driven along a track. A depending trolley dog, engaged by drive dogs on a drive mechanism to push the trolley along the track, is movable between upper and lower positions for disengagement and engagement with drive dogs. The stop mechanism includes a pivotal stop arm which is pivoted to an upper position to engage a trolley dog on a trolley to be stopped and supported there by a...

A shock absorbing tow bar for connecting between a drive trolley and a load carrying trolley of a conveyor system. The tow bar includes a pair of tubes that reciprocate relative to each other. A plunger is located within a first of the tubes and attached to a second tube. Mounted on the plunger are a pair of brake surfaces that frictionally engage the first tube. The brake surfaces are biased toward the first tube by springs and the force applied to the brake surfaces is adjustable through an ad...

A floor conveyor junction seal gap closure includes a closure member pivotally mounted on and resiliently connected to a bracket extending upward from a conveyor switch mechanism. The floor conveyor includes a main line and a diverging branch line, both adapted to carry load trolleys connected by posts to load carriers positioned above the floor level. Floor slots are provided to clear the connection posts, and the slots are closed by split resilient seals. The seals are opened by the connection...

The present invention is directed to a seal crossover system which includes two seal plates adjacent to slot crossover portions of separate respective conveyor loops as they diverge (or converge) past a switch in a power and free conveyor system. The seal plates are driven by respective pneumatic cylinders which are pneumatically linked to a switch cylinder such that the seal plates are automatically extended or retracted depending upon the condition of the switch. Thus a respective slot crossov...

An automatic stabilizing unit for a free trolley and a load carriage in an inverted power and free conveyor system is connected to the free trolley. The stabilizing unit includes a stabilizer actuator which extends above a free track containing the free trolley from beneath the floor of a building which houses the conveyor, and a stabilizing gear mounted on the load carriage. At locations in an assembly plant, such as robotic welders or riveting stations where load shifting tolerances are critic...

A shock absorbing tow bar for connection between the accumulating trolley and load carriage of a power and free conveyor system is disclosed. The tow bar includes one component that is connectable to the accumulating trolley and another that is connectable to the intermediate trolley of the load carriage. Limited relative shifting is permitted between the components of the tow bar. Moreover, the components are threadably intercoupled so that such relative shifting requires a screwing or unscrewi...

A shock absorbing tow bar for connection between the accumulating trolley and load carriage of a power and free conveyor system is disclosed. The tow bar includes one component that is connectable to the accumulating trolley and another that is connectable to the intermediate trolley of the load carriage. Limited relative shifting is permitted between the components of the tow bar. Moreover, the components are threadably intercoupled so that such relative shifting requires a screwing or unscrewi...

A cushioned tow bar for connecting a drive trolley to a load carriage in a power and free conveyor system includes a particulate shock absorber with a damping chamber which is partially filled with particulate material, such as small ball bearings, which act to dampen the movement of a piston through the damping chamber. The damping chamber comprises a portion of a sleeve which includes a threaded end cap which mates with threads on an open end of the sleeve. The threads in the sleeve extend alo...