| 摘要 |
PCT No. PCT/SE90/00009 Sec. 371 Date Jul. 3, 1991 Sec. 102(e) Date Jul. 3, 1991 PCT Filed Jan. 4, 1990 PCT Pub. No. WO90/08265 PCT Pub. Date Jul. 26, 1990.A fastening device in the form of a plug and a screw is adapted for installation in a blind bore of a thick wall or in a through hole in a thin wall. The plug is formed as an elongated body having a central longitudinal hole. The body has inner and outer end portions and two parallel slots extending longitudinally between the end portions to define four legs arranged circumferentially around the body. The legs diverge from the end portions to form an increasing diameter for the body which reaches a maximum at the center of the body. When the plug is inserted into a blind bore the legs are displaced inwardly to reduce the size of the central longitudinal hole so that when the screw is inserted into the plug, the screw will exert force on the legs to press the legs against the wall with strong radial forces. When the plug is inserted in a thin wall, threaded engagement between the screw and the inner end portion of the plug produces longitudinal displacement of the inner end portion and radial deformation of the legs to provide clamping pressure at the back of the wall at four distant locations.
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