| 摘要 |
Apparatus for moving a load, particularly a stack of panels, along a roof structure, including a plurality of spaced-apart roof rafters and transverse purlins comprising: a roof-mounted rail for mounting on said roof in vertical alignment with a purlin, a load-carrying cart comprising a carriage having rollers movable along the rail, and a load-carrying platform mounted on the carriage for longitudinal and vertical movement relative thereto including an inverted U-shaped elongate channel member. Mechanism is provided for relatively longitudinally moving the load-carrying platform and the carriage between rest positions and longitudinally displaced positions. The carriage and load-carrying platform include cooperating camming rollers and cam receiving slots which upwardly guide the platform relative to the carriage as the carriage and platform are relatively longitudinally moved, to lift the load relative to the roof structure for subsequent rolling movement via the carriage on the track. One aspect of the invention includes an inverted U-shaped load support platform which spans the track and the cart and underlies the load to support the load when the load-carrying platform is in the rest position but is moveable upwardly with the load when the platform is moved to the raised level. Another aspect of the present invention includes a stop bar plate on the rail, engageable by the cart after the cart and rail have relatively moved a predetermined distance. When the load-carrying platform is at the lowered level and the operator continues to bodily move the cart, the rail is longitudinally moved with the cart, to provide a track which has an effective length much greater than its actual length.
|
