Sfs Industrie Holding Ag

Peter Kouwenhoven

Felix Scheiwiller

Norbert Koeppel

Helmut Oesterle

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 The jaws ( ) can be axially inserted into or withdrawn from the holder ( ), wherein the jaws in the withdrawn position can be pivotably forced apart into open position.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 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 The jaws (,) can be axially inserted into or withdrawn from the holder (,), wherein the jaws in the withdrawn position can be pivotably forced apart into open position.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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Widnau, Switzerland

Peter Kouwenhoven