| 摘要 |
Quadrapod (12) having a central vertical support column (20) and a horizontal plate (22) fixed to the upper portion is disclosed. A slide ring (30) surrounds the column (20) and is movable substantially throughout the length thereof from the bottom of the column to the undersurface of the plate (22). Four pairs of legs (52, 54) extend outwardly from the ring (30) and the plate (22) and terminate in four different feet (56). Each pair of legs includes an upper leg (52) pivotally connected between the plate (22) and the foot (56) and a lower leg (54) pivotally connected between the movable ring (30) and the foot (56). In its operative position, the ring (30) is moved downwardly so that the legs extend outwardly and the quadrapod rests on the four feet. In its collapsed position, the ring (30) is moved upwardly so that the legs and feet are moved inwardly so as to be substantially parallel to the center column. Each of the feet includes a vertical adjusting means (58). The top (24) of the column provides a support for a lever or support arm (14) that extends outwardly from the device. Fall protection devices (16) and/or a winch (18) or the like are also supported on the support arm (14). |
