| 摘要 |
A hoist for use over a man hole includes a H shaped base part defining two side struts and a cross strut offset toward one end of the side struts. The base part has four legs arranged at the ends of the side struts, adjustable in height and terminating in a flat pad for engaging the ground. A vertical sleeve part extends upwardly from the cross strut for receiving a swivel arm which is a separate item and can be inserted into the sleeve part for swivelling movement about a vertical axis. A swivel arm includes a jib portion extending out over the larger area defined forwardly of the cross-strut. Swivelling movement is limited to the forward area. |
