Wall plug

Claim 1

A wall plug for fastening articles to building materials, comprising: a first end part having a longitudinal bore, said longitudinal bore of said first end part being provided with internal threading means which receives in assembly a fastening screw; a second end part having a longitudinal bore and provided with means for preventing rotation of the plug during fastening; two non-flat limbs each having a smooth outer surface and extending at one end from said first end part and connected at another end to said second end part, said limbs having two facing surfaces separated by a slot, and a central region having an elliptical cross-sectional profile which has a major and a minor diameter and which gradually becomes circular towards said first end part and said second end part, said slot having a width substantially corresponding to the difference between said major and minor diameters of said elliptical cross-sectional profile, said facing surfaces of said limbs being provided with longitudinal ribs; and means forming a weakened cross-section in said central region of said limbs, whereby the wall plug can be used for fastening articles to hollow building materials such as panels and hollow walls wherein, upon screwing of said fastening bolt into the plug, said limbs are forced to buckle radially outwards and fold axially of the plug and for fastening articles in solid building materials wherein upon screwing of said fastening bolt into the plug, said two limbs are compressed together causing said facing surface to touch in said central region.