Sfs Industrie Holding Ag

Sfs-intec Holding Ag

Paul Mattle

Ernst Thurnherr

A wooden beam ( ) has several sections which are subjected to a transversal tension and which affect in particular the areas in which there are recesses or openings ( ). Rod-shaped elements are provided in the form of screws ( ) which are introduced in such a way that they extend crosswise to the longitudinal direction of the beam ( ) in order to absorb this transversal tension. These screws are screwed in from the top side ( ) or the underside ( ) of the beam ( ) and each extend over part of the height (H) of the beam ( ) only and are therefore directly associated with the area ( ) that is subjected to transversal tension.

Wooden beams with sections that are subjected to transversal tension

In a joint between two wooden structural members ( and ) there is inserted a joint plate ( ), whose foot part ( ) is joined abuttingly to the wooden structural member ( ) by screws ( ). The joint plate ( ) is pushed into a slot ( ) of the wooden structural member ( ), whereupon connecting elements ( ) are inserted in appropriate number through the wooden structural member ( ) and the joint plate ( ). Such a connecting element is provided at one of its ends with a boring part ( ) and at its other end with a tool drive ( ). The worked-off material is received by a portion ( ) of smaller cross section and appropriate flutes ( ). In addition, an axially secure relationship after setting is achieved with a thread ( ) at one end of the connecting element. After it has been finally set, the connecting element ( ) is seated in an exact fit as the fixation between the joint plate ( ) and the wooden structural member ( ) in its self-drilled hole.

Connecting element for connecting at least two wooden construction parts and a joint plate

In a screw (,) for fastening wooden laths (,) to a roof substructure provided with wooden beams (,) among other alternatives, one threaded portion (,) each adjoining the head (,) of the screw and adjoining a penetrating or boring point (,) is provided, these two threaded portions (,) having the same major diameter. A thread-free shank portion (,) is provided between the two threaded portions (,).

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Widnau, Switzerland

Paul Mattle