| 摘要 |
Fixing device for knocking into a pre-drilled hole in concrete or the like, including a plug (1) and a nail (2) coacting therewith. The purpose of the device is to provide a fixing element giving the greatest possible contact surface and the greatest possible surface pressure against the wall of the pre-drilled hole, and thereby maximum resistance to withdrawal. This purpose has been achieved by the expansion zone (3) of the plug including longitudinal ridges (9) arranged internally in the nail hole and longitudinal grooves (10) arranged in the exterior surface, ridges and grooves being formed such that a substantially constant cross-sectional area is obtained in the expansion zone (3) along the greater portion of its length. |
