| 摘要 |
Fastening device in the form of a universally usable plug (1) designed for cooperation with a screw (3) intended to be arranged in a pre-drilled hole (15) in a building component (16, 18) irrespective of the fact that this is composed of board material (18) having a cavity behind and is solid respectively. The plug (1) which has a central hole (2) comprises, in its fixed condition, an inner end portion (4) arranged to receive and grip the thread of the cooperating screw (3), four legs (6-9) extending from the inner end portion and an outer end portion (10) in which the legs join. Due to the fact that the legs (6-9) have an increasing width in the direction of the central part and are designed with sectional weakenings (19-22) at the center it is achieved on one hand that at the application of the plug in a solid material (16) the plug (1) will be expanded by the screw (3) and bear on four sectors of the wall of the hole, and on the other hand at the application of the plug (1) in a board material or equivalent the four legs are broken outwards at the back side of the board (18) preferably in radial direction. Hereby an even distribution of the pressure against the edge of the hole is achieved by the creation of four contact points. |
