Self-tapping screw-type masonry anchor

Details Self-tapping screw-type masonry anchor Self-tapping screw-type masonry anchor

F - Mech Eng,Light,Heat,Weapons

16

B

F16B 25/04 (2006.01) F16B 25/00 (2006.01) F16B 33/02 (2006.01)

Patent

CA 2211921

A self-tapping, screw-type anchor capable of being turned into a hole drilled in masonry whose hardness renders the wall of the hole highly resistant to a tapping action. The anchor includes a thread forming a helical ridge on the root of the anchor, the thread having a profile defining a pair of opposing curvilinear flanks rising above the root and converging toward a crest. The curvature of the flanks which is preferably hyperbolic, creates a crest having a small included angle adapted to penetrate the wall of the hole, the crest being supported on a relatively broad base that merges with the root to firmly secure the thread thereto and thereby prevent deformation or mutilation of the thread as the anchor is being turned into the hole.

Ancre à vis auto-taraudeuse conçue pour pouvoir tourner dans le trou percé d'une maçonnerie très dure, où la paroi du trou résiste fortement à toute action de taraudage. L'ancre présente au niveau de sa racine un filet formant une saillie hélicoïdale et dont le profil délimite deux flancs curvilignes s'élevant au-dessus de la racine et convergeant vers une crête. La courbure des flancs, de préférence hyperbolique, produit une crête offrant un petit angle inclus et conçu pour pénétrer la paroi du trou. Cette crête, en effet, prend appui sur une base relativement large qui fusionne avec la racine pour que le filet lui soit fermement rattaché et qu'il ne subisse ni déformation ni mutilation lorsque l'ancre tourne dans le trou.

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