| 摘要 |
A hollow externally threaded bolt (7) engages an internally threaded sleeve (4) and concentrically holds a freely moveable bolt (13), which is threaded at least at its lower end, for engagement with a correspondingly threaded axial bore in a plug (3). By turning its hexagon head (14) the bolt (13) is screwed into the plug, and the sleeve (4) then adjusted until its lower, free end contacts the base component surface (2) and the hollow bolt head (8) contacts the underside of the bolt head (14). By unscrewing the hollow bolt (7) out of the sleeve, the plug is pulled from the base. Threads (11) and (17) on the bolt (7) and sleeve (4) are opposite handed. |
