| 摘要 |
Powered roller conveyors, which may be expandable and/or flexible. One or more drive belts (tubing or chain) extends across drive rollers and smaller-diameter guide rollers or sheaves on the top surface of the conveyor, and under followers located beneath the top surface of the conveyor. In the expandable and flexible conveyor version, the followers are located from the drive and guide rollers approximately the same distance as the connections between bars in the lazy tong structures forming the supports for the conveyor so that as the lazy tong structures expand, the segments of the drive belt between guide and drive rollers on the one hand and the followers on the other hand, remain substantially constant, thus allowing the drive belts to power their conveyor at any desired expanded length. Such belts may be used with conveyors that feature only axles to support the rollers on their top surfaces, with conveyors that use axles and additional strengthening structures such as braces and roller clips, and with conveyors which do not include lazy tong structures but instead use C-beams, I-beams or similar longitudinal structural members to support the axles and rollers. One or more drive belts may be used. Skate wheel type rollers or long rollers may also be used.
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