Hilti Aktiengesellschaft

Reinhard Buhri

Elmar Thurner

Walter Odoni

Stefan Boenig

Alfred Tobler

Elmer C Hoepker

Stefan Bönig

A threaded bolt includes a head (), a load cation section () having a bar-shaped core region (), an attachment section (), with the head (), the core region (), and the attachment section () being formed as a one-piece part formed of metal, and a thread ()-carrying threaded sleeve () formed of a plastic material and secured radially outwardly on the core region (), with the thread () of the threaded sleeve () forming the outer thread of the load-application section ().

Threaded bolt

A method for anchoring a fastening element to a flat steel member, in which the fastening element is driven into a blind hole previously drilled in the steel member is disclosed. Initially, in a first step of the method, a metal disk is adhesively bonded to the steel member. In a subsequent second step, a blind hole is drilled into the stack formed by the metal disk and the steel member and, in a subsequent third step, the fastening element is driven into the pre-drilled blind hole in the stack using a hand-held drive-in tool.

Method for anchoring a fastening element to a steel member

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

An explosive powder charge operated fastening element assembly setting device is used to drive a fastening element into a hard receiving material such as concrete, steel and the like. The device includes a striker piston transmitting driving force to the fastening element assembly. The forward end of the striker piston has a marking projection. If excessive driving energy is transmitted from the striker piston to the fastening element assembly, the marking projection forms an imprint in a guidance disk of the assembly. The extent of the imprint provides a gauge of the excessive driving force which results in unsatisfactory insertion of the fastening element. If an annularly-shaped marking projection is used, the imprint formed by it can be viewed from all sides of the fastening element.

Growing community of inventors

Frastanz, Austria

Reinhard Buhri