| 摘要 |
1,181,233. Overhead supports for lifting tackle of temporary and portable character. R. S. EDRIDGE. 22 March, 1967 [22 March, 1966], No. 12650/66. Heading B8B. A load transporter comprises a jib 3 supported by a portal frame 2 and including two parallel booms spaced horizontally from one another and having tracks extending along their tops on which is movably mounted a trolley 4 for supporting a load. The transporter is for positioning on an upper floor of a building with the jib projecting from the latter for hoisting loads from ground level. A structure 1 supports the inner end of the jib and houses individually driven winding drums 41, 42 from which extends a hoist rope engaging a hook unit 5 on the trolley, and the structure also houses winding means 45 for moving the trolley. Each boom consists of similar units releasably connected end-to-end and the number of units may be altered to vary the jib length. Each unit comprises three tubes forming a triangular cross-section and interconnected by bracing members, and the units are interconnected by spigots and bolts, Fig. 5 (not shown). The structure 1 is of bridge form and has wheels 36 and shoes 32, the latter being operated by screw jacks 33 to raise the wheels and press wooden blocks against the ceiling associated with the floor so as to anchor the structure between the floor and the ceiling. The wheels are adjustable about vertical axes by levers 36a which subsequently, lock the wheels so that the structure can be moved when the shoes are raised. The portal frame 2 has similar wheels and jack-operated shoes, and the jib is supported from the portal frame by spherical mountings so that bending moments on the jib will not be transmitted to the frame, Fig. 4 (not shown). |
