Hilti Aktiengesellschaft

Werner Wanger

Matthias Blessing

Hans Hachtel

Horst-Detlef Gassmann

Michael Mergenbaum

Hans Gschwend

A rotatable cutting tool having s support region () with an end surface () and a plurality of recesses () extending from the end surface () and in which, respectively, a plurality of cutting elements () are arranged, with each recess having a rigid stop surface () for a cutting element () and faces in a rotational direction (R) of the tool, and a gripping surface () facing in a direction opposite the tool rotational direction (R) and cooperating with the cutting element, with the gripping surface () being displaceable by a respective locking element in the direction opposite the tool rotational direction.

Cutting tool

A fastening element which is designed for driving-in a constructional component, includes a stem ( ) adjoined, at it's opposite sides, by a load application section ( ) and a tip ( ) facing in the setting direction of the fastening element, and a prestress member ( ) having a force-introducing section ( ) engaging the stem ( ) and/or the tip ( ), and a bearing surface ( ) remote from the load application section ( ) and provided with an elastic layer ( ) having an opening ( ) a wall ( ) of which is radially spaced from an axial projection of the stem ( ).

Fastening element with a prestress member having an elastic bearing surface

An expansion dowel assembly includes a sleeve-like support bearing incorporating load engagement surfaces, and annular disks displaceably held on the support bearing by a tension member for displacement between a radially inwardly displaced position and a radially outwardly displaced position. The annular disks are formed of a spring-like material. The tension member clamps the disks in the radially inwardly displaced position in the form of a hollow cone. When the clamping force on the disks is removed, because of their spring-like characteristic, they move into the radially outwardly displaced position flattened out from the hollow cone configuration. A load can be applied to the support bearing at the load engagement surfaces.

Growing community of inventors

Mauren, Liechtenstein

Werner Wanger