Hilti Aktiengesellschaft

Alfred Tobler

Elmar Thurner

Reinhard Buhri

Elmer C Hoepker

Oliver Berchtold

Josef Beck

Hans Hachtel

A fastening element assembly is made up of a nail-like fastening element and a deformable sleeve displaceably secured on the fastening element shank. The assembly is used to secure sheet metal plates to a base material of variable strength. At its leading end the sleeve has an outwardly extending flange. When the assembly is driven into a receiving material or base, the sleeve is displaced in the rearward direction along the shank toward the trailing head on the fastening element. The shank widens conically toward the head. As the sleeve is displaced rearwardly, it is radially expanded. When the trailing end of the sleeve contacts the head, the sleeve collapses or is deformed in the axial direction in the manner of an accordian. Excess energy applied to the assembly during the driving step is converted into deformation work acting on the sleeve.

Fastening element assembly with a deformable sleeve

A fastening member to be driven into a hard receiving material, such as concrete, masonry, rock and the like, has an axially extending shank with a drilling head at its leading end and a thread adjacent its trailing end for connecting a load to the fastening member. A device is located on the shank for engagement with a tool for driving the fastening member into the receiving material. Initially, the fastening member drills a blind bore into the receiving material and then an explosive powder charge drives the member into its final position.

Fastening member for securement into hard materials

An anchor rod assembly includes an axially elongated anchor rod to be secured in a borehole by a hardenable mass inserted into the borehole around the anchor rod. The anchor rod is divided by slots into a plurality of circumferentially spaced axially extending segments extending from the leading end of the anchor rod. The anchor rod has an axially extending central bore located radially inwardly of the segments. A filler piece is inserted into the central bore and the slots between the segments. The filler piece closes off the slots between the segments at the outer circumferential surface of the anchor rod. Due to the filler piece, the hardenable mass cannot flow into the slots between the segments and the central bore. As a result, the segments follow movement of the borehole wall during any widening of the borehole because of cracked development, and the anchor rod is retained in the borehole. A radially inwardly formed constriction in the outer circumferential surface of the segments adjacent the trailing end of the anchor rod improves deformability of the segments.

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Erlen, Switzerland

Alfred Tobler