Sfs Industrie Holding Ag

Norbert Koeppel

Felix Scheiwiller

Helmut Oesterle

Peter Kouwenhoven

Erich Palm

A screw ( ) is provided with a shank ( ), a head ( ) and a boring part ( ). The shank ( ) is provided with a thread ( ). The head ( ) has a shoulder ( ) disposed at an axial distance (B) from the bearing face ( ), while a portion ( ) adjoining the shoulder on the shank side is provided with a tool drive ( ). The head ( ) of the screw can therefore be seized in axially secure manner by a tool in the region of the shoulder ( ), and this tool can then simultaneously transmit the necessary torque in the region of the tool drive ( ) as well.

Screw with tamper-proof head

In a screwing element ( ) for accommodation of a fastener head ( ) of a fastener ( ) there are provided jaws ( ) for seizing the fastener head. The jaws ( ) can be axially inserted into or withdrawn from the holder ( ), wherein the jaws in the withdrawn position can be pivotably forced apart into open position. At their free end the jaws are provided with incisions ( ) and, adjoining these, with gripper-like parts ( ) jutting outwardly toward the central axis for the purpose of engaging mechanically and/or frictionally with the fastener head ( ) from behind.

Screwing element

In a screw for fastening sections to a substructure, a shank ( ) is provided with a boring portion ( ) and a threaded portion ( ) as well as a screw head ( ). The portion ( ) of the shank ( ) adjacent to the screw head ( ) flares conically toward the screw head ( ). On its underside ( ) the screw head ( ) is provided with projections and/or depressions. During use for fastening sections to a substructure, the section to be fastened is pressed by the conical portion ( ) in screwing direction against the fexed substructure ( ).

Screw for torque-limited fastening

In a screwing element (,) for accommodation of a fastener head (,) of a fastener (,) there are provided jaws (,) for seizing the fastener head. The jaws (,) can be axially inserted into or withdrawn from the holder (,), wherein the jaws in the withdrawn position can be pivotably forced apart into open position. At their free end the jaws are provided with incisions (,) and, adjoining these, with gripper-like parts (,) jutting outwardly toward the central axis for the purpose of engaging mechanically and/or frictionally with the fastener head (,) from behind.

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Au, Switzerland

Norbert Koeppel