Expansible anchor and method of making the same

F - Mech Eng,Light,Heat,Weapons – 16 – B

Patent

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F16B 13/06 (2006.01)

Patent

CA 2109851

The expansible anchor consists of a shank having a threaded portion for fixing an article at its rear end and a reduced cross-sectioned portion with an adjoining expander cone at its front end, and, positioned over the reduced cross-sectioned portion, an expansible sleeve having longitudinal slits forming expansible segments and locking elements protuding beyond the diameter of the expansible sleeve and arranged on the expansible segments. To increase the holding force of the anchor and to allow the expander cone to slide-up and the expansible sleeve to expand in operation-if the drilled hole become enlarged as a result of cracks forming, the locking elements consist of several interconnected punched elements on each expansible segment extending in a longitudinal direction of the expansible segments. Each punched element is triangular with a point directed towards the front end of the expansible segments. An improved method of making the expansible anchor which includes stamping a blank for the expansible sleeve somewhat undersized from sheet metal, subsequently pressing it and then punching the punched elements in the expansible sleeve is also described. - 1 -

Élément d'ancrage mural comportant une tige dont l'extrémité arrière est filetée pour permettre d'y fixer un objet, l'extrémité avant de la tige étant pourvue d'un cône d'expansion, la partie centrale séparant les deux extrémités étant de section réduite et enfilée à l'intérieur d'une douille d'expansion pourvue de fentes longitudinales définissant des segments déformables dont la déformation au-delà du diamètre de la douille produit l'effet d'ancrage de l'élément. Pour accroître la force de rétention de l'élément d'ancrage et permettre au cône et à la douille d'expansion d'exercer leur effet d'ancrage au cas où l'avant-trou serait l'objet de fissuration, les éléments d'ancrage consistent en une pluralité de segments reliés mais distincts en déploiement longitudinal. Chacun des éléments distincts, de forme triangulaire, comporte une pointe orientée vers l'avant des segments d'expansion. Une méthode améliorée pour la fabrication de l'élément d'ancrage comporte une étape d'emboutissage d'une ébauche de métal en feuille pour la production d'une douille d'expansion légèrement inférieure à la cote, suivie d'un travail à la presse et d'une opération de découpage. - 1 -

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