Hilti Aktiengesellschaft

Horst-Detlef Gassmann

Josef Obermeier

Eugen Magyari

Walter Ritt

Ernst Wohlwend

Hans Hachtel

Werner Wanger

Jens-Jörg Esser

Ralf Laternser

Peter Cavada

Michael Mergenbaum

A nail-shaped fastening element having a stem, and a head () provided at one end of the stem and projecting radially beyond the stem with the stem tapering at its another, free end toward a tip () and having a spherical, first section () extending from the tip () in a direction toward the head (), and a second conical section () adjoining the first section () and having a length (LLLL) smaller than a length (LLLL) of the first section ().

Nail-shaped fastening element

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

A hollow drilling tool is made up of an axially extending tubular carrier part, a cutting body at one end of the carrier part, and guide elements located in the axial direction of the carrier part between the cutting body and the carrier part. The radially outer surface of each guide element is in alignment in the axial direction of the carrier part with the radially outer surface of the cutting body. The guide elements guide the hollow drilling tool in a borehole formed by the cutting body.

Hollow drilling tool

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Ruggell, Liechtenstein

Horst-Detlef Gassmann