Abstract: A device for guiding an airflow in a region of a roof opening in a motor vehicle roof comprises a wind deflector and at least one additional deflector. This additional deflector has a rear end face and is movably fastened to the wind deflector and adapted to protrude vertically upwards with respect to a rear edge of the wind deflector. The wind deflector and the additional deflector are each movable from a normal, unextended position into an extended position. The additional deflector is fastened to an underside of the wind deflector when in its normal position and moves along the rear end face of the wind deflector when moving into the extended position.

Abstract: A device for guiding an airflow in a region of a roof opening in a motor vehicle roof comprises a wind deflector and at least one additional deflector. This additional deflector has a rear end face and is movably fastened to the wind deflector and adapted to protrude vertically upwards with respect to a rear edge of the wind deflector. The wind deflector and the additional deflector are each movable from a normal, unextended position into an extended position. The additional deflector is fastened to an underside of the wind deflector when in its normal position and moves along the rear end face of the wind deflector when moving into the extended position.

Abstract: An ultrasound converter, especially of the axial oscillating type, with at least one piezoelectric element disposed between two tensioning segments and at least one tensioning member which prestresses the piezoelectric element via the tensioning segments. The tensioning element is a ring-shaped tensioning spring the walls of which have at least one peripheral recess.

Abstract: The invention relates to an ultrasound converter, especially of the axial oscillating type, with at least one piezoelectric element disposed between two tensioning segments and at least one tensioning member which prestresses the piezoelectric element via the tensioning segments. The tensioning element is a ring-shaped tensioning spring the walls of which have at least one peripheral recess.

Abstract: In a sliding roof for automobiles, comprising a non-slidable, front wind deflector, pivotal at its front edge in a roof opening, and a rear sliding lid, slidably guided in the roof opening, the roof opening is filled by the mutually adjoining surfaces of wind deflector and sliding lid when the roof is closed. For creating a ventilation gap of high effectiveness between the rear edge of the wind deflector and the front edge of the sliding lid in conjunction with an aerodynamically favourable small pivoting out angle of the wind deflector, it is provided that the sliding lid, starting from its closed position, is pivotally journalled about a pivot axis provided in the vicinity of its rear edge, in the sense of lowering its front edge. For the opening displacement, the sliding lid is also lowered at its rear edge, with the result that, with low overall depth of the roof construction, the lid is displaceable approximately in a parallel orientation to the roof surface beneath a rear roof surface.