Roller track assembly incorporating a mechanical elevator mechanism

摘要

An elevating roller track assembly having a base member and a lift bar located in a channel which is formed in the base member. The lift bar is slidably mounted for longitudinal movement relative to the base member. A first elevator ramp is mounted on the lift bar. The first ramp has a first ramp face which is inclined upwardly toward a first end of the base member. A roller support member is slidably mounted in the base for longitudinal movement. The roller support member has a bottom wall overlying the lift bar. A plurality of load supporting rollers are mounted for rotation on and extending upwardly from the roller support member. A second elevator ramp is mounted on the bottom wall of the roller support. The second elevator ramp has a second ramp face which extends parallel to the first ramp face in a face-to-face relationship therewith. A drive mechanism is provided for driving the lift bar to and fro with respect to the base member to cause the first and second ramp faces to slide over one another to raise or lower the roller support member and its associated rollers as required in use.