| 摘要 |
A concrete anchor (10) for securing the lanyard of a workman's harness to a fixed position on a concrete surface includes a cylindrical housing (12) having an outer wall (14) with openings (22 and 24) therein and a rod (40) that extends above the housing (12) to which a harness can be attached. Hard metal balls (26 and 28) within the housing are associated with each opening (22 and 24) and are dimensioned so that a portion of each ball can pass through each opening but the entire ball can not pass therethrough. A pair of cones (30 and 32) within the housing move the balls radially outwardly as the cones are moved upwardly by the rod which is spring (28) biased upwardly. |
