Sfs Industrie Holding Ag

Helmut Osterle

Stefan Baumgartner

Erich Palm

Daniel Gasser

Norbert Koppel

Markus Steffen

Guido Hasler

Richard Sahli

Walter Seifert

Marcus Steffen

A hole-shaping and thread-forming screw ( ) has a non-cutting hole-shaping end section ( ) that ends in a point, a haft section ( ) provided with a thread ( ) and an engagement section ( ). The non-cutting hole-shaping end section ( ) tapers towards its end. The whole screw is made of a stainless material, in particular its end section ( ). When the screw ( ) is driven in, a hole is haped without cutting into the workpiece ( ) and is then threaded by the screw ( ) itself.

Non cutting hole-shaping and thread-forming stainless screw and process with impact for driving in the same

Large-area washer

A large-surface plain washer (1) has an opening (5) for inserting a fastener. Engagement elements (1) that increase the engagement with a plate and/r web to be fastened are provided at the surface of the washer (1) that faces in the fastening direction. In addition, projecting spacers (17) shaped as tongues (26) that become effective when several washers (1) are stacked are provided at the lower side of the washer (1). The free end of these tongues (26) may be supported on the top side of the plain washer located directly underneath, so that the washers may be stacked without causing the engagement elements (13) of different washers (1) to engage each other. Individual washers (1) may thus be easily separated from a stack of washers (1), either by rotating or by moving the lowermost washer.

Large-area washer having friction increasing elements on the underside

Packaging for rod-shaped parts

Growing community of inventors

Feldkirch, Austria

Helmut Osterle