Expansion bolt
AssigneeCoalequip (Proprietary) Limited
InventorsDaniel Minnaar, Clive Straughan
Life of this patent
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Abstract
The invention relates to an expansion bolt of a type having an expansible shell arranged on an elongated stud, with a tapered plug being provided to expand the shell in use. In order to render the bolt more versatile, a spacer is provided between the plug and the expansible shell, the spacer being in the form of finger elements which engage the inner surface of the shell to expand it.
Claims7
An expansion bolt comprising an elongated stud member which is adapted to provide an anchorage at its leading end in use, a plug element secured to the stud towards its remote trailing end, an expansible shell on the stud, a spacer member disposed on the stud intermediate the shell and the plug, the spacer member being comprised of a plurality of elongated finger elements which are adapted to expand the shell radially upon movement of the plug towards the shell and deformable means coupling the ends of the finger elements adjacent the plug element together, said deformable means having sufficient strength to ensure the expansion of said shell prior to the radial expansion of said finger elements of said spacer.
Dependencies are inferred from the claim text.