Sfs Industrie Holding Ag

Stefan Baumgartner

Helmut Osterle

Daniel Gasser

Walter Seifert

Jurg Maurer

Marcus Steffen

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.

Pack of large surface washers

Large-area washer having friction increasing elements on the underside

Growing community of inventors

Altstatten, Switzerland

Stefan Baumgartner