Hilti Aktiengesellschaft

Michael Sproewitz

Markus Frommelt

Bernhard Winkler

Peter Gstach

Matteo Spampatti

Patrick Scholz

An expansion anchor is provided, which is fixable in a borehole, including an expansion sleeve for anchoring on a wall of the borehole and including an anchor bolt which is guided through the expansion sleeve and which has an expansion area for expanding the expansion sleeve, the expansion sleeve having a first annular groove on its outside, which extends up to the front end face of the expansion sleeve facing the expansion area. According to the invention, it is provided that the expansion sleeve has a second annular groove on its outside, and that an annular connection piece is situated between the first annular groove and the second annual groove.

Expansion anchor

A fastener driving tool for an insulation material plug that anchored with a fastener in the substrate has a first drive shaft and a second drive shaft. The first drive shaft has a shank extending along a longitudinal axis having a first rotary carrier for the fastener at a first end and that has a second rotary carrier second end. The second drive shaft has a hollow shank with a third carrier means for the insulation material plug at a first end. A coupler is provided that can be disengaged by axial pressure and arranged at a distance from the first end. The coupler has locking elements that engage into recesses in order to transfer a torque from the first drive shaft to the second drive shaft. Grooves guide the locking elements are adjacent to a recess and, extend helically along the circumference.

Growing community of inventors

Feldkirch-Tisis, Austria

Michael Sproewitz