Peg for engagement in countersunk section of a bore

Claim 1

A peg for implantation in a bore in a masonry, brickwork and the like, which bore is provided internally with a radial enlargement, said peg comprising an axially elongated sleeve having an inner thread for receiving a fastening screw and said sleeve having a leading end arranged to be inserted first into the bore and a trailing end, said sleeve comprising a leading part longitudinally slotted from the leading end to provide a plurality of axially extending segments separated by axial slots terminating between said leading end and trailing end, a trailing annular part extending from the end of said slots closer to said trailing end toward said trailing end, said sleeve having a relaxed condition and a flexed condition where said segments are compressed radially inwardly from the relaxed condition, said leading part having a greater outside diameter, in the relaxed condition than said adjoining trailing annular part of the sleeve, the outside diameter of said leading part being variable in the flexed condition to enable said segments forming said leading part to be pushed into the bore and to be released into the relaxed condition and snapped into the enlargement in the bore to inhibit withdrawal of the peg from the bore, characterized therein that the annular trailing part and the leading part of the sleeve are integral and the leading part is provided externally and segmentally with an axially extending annular radially thickened section, said leading part of the sleeve is provided integrally at the leading end toward the radially thickened section with an axially extending cylindrically shaped extension segmented by the axial slots, the outer diameter of said extension in the relaxed condition being equal to the diameter of the annular trailing part and being less than the diameter of said radially thickened section, and that the said inner thread is provided in the axial region of the leading part including the extension of the sleeve, and in its relaxed condition, said sleeve is of substantially the same inner diameter over the complete axial length thereof, said segments of the leading part are integrally connected through bridge pieces with a ring forming at least part of the trailing part, and the leading part merges into the bridge pieces through a steep radially inwardly directed conical taper.