Stepping conveyor

Claim 1

In a stepping conveyor of the type including a plurality of trolley rail hangers each having a substantially vertically disposed surface secured at one end to a ceiling structure and depending therefrom and secured at their other end to a horizontal trolley rail supporting the trolley rail is spaced relation to the ceiling structure, a plurality of work supporting trolleys supported on the trolley rail for movement therealong, and a reciprocating walking beam supported in substantially parallel relationship above the trolley rail and having a plurality of trolley engaging pushers for advancing and spacing trolleys in stepping manner along the trolley rail, the improvement comprising: a horizontally reciprocable walking beam of T-shaped cross-sectional configuration having a vertical web and a pair of substantially flat, coplanar flanges extending in opposite directions laterally from opposite sides of the upper edge of the web; and support means for the walking beam comprising a plurality of stationary walking beam support brackets each including a generally rectangularly shaped base bolted to and in parallel relationship with the vertical surface of the trolley rail hangers, a substantially horizontal, generally rectangularly shaped walking beam support plate welded at one edge thereof to said base and extending substantially perpendicularly therefrom, a pair of substantially flat, coplanar, laterally spaced apart bearing plates releasably secured relative to the underside of the support plate by bolts, a distance greater than the thickness of the flanges of the walking beam to preclude contact of the upper surfaces of said flanges with the lower surface of the support plate, and having coplanar upper bearing areas spaced below the support plate, spacers secured between the undersurface of the support plate and the bearing plates, and a strip of inherently slippery self-lubricating material on the bearing areas slidably supporting the undersurface of the flanges of the walking beam thereon with the web of the walking beam received in the space between the bearing plates, said strip including a first horizontal portion overlying the upper surface of a bearing plate and extended between the bearing plate and spacer associated therewith, a vertical portion extended downwardly across the inner edge of the bearing plate, and a second horizontal portion extended a limited distance rearwardly beneath the bearing plate, bolt means extended through the bearing plates, strips of slippery material, spacers and support plates, securing them together, and means associated with the walking beam to reciprocate it to advance trolleys along the trolley rail in stepping manner and in a common direction.