Abstract: A snowboard binding with step-in function holds a boot by means of front and heel brackets. The heel bracket is preferably coupled to a driving element that moves the heel bracket in the direction toward the other bracket and simultaneously downward, namely in the direction toward the snowboard surface, during the movement from the open position to the closed position. A spring piston locks the driving element directly or indirectly in the closed position. This locking effect is realized in such a way that the closing force of the binding does not depend on the force of the spring of the spring piston.

Abstract: A safety binding for snowboards has a base plate (1) on which the snowboarder's boot is fastened. This base plate (1) is fixed in its turning position by a spring plunger (8) and a stop pin (7), but can be turned out of this position when the torque acting on it exceeds a value preset by the initial tension of the spring (10) of the spring plunger (8). The base plate (1) is rigidly connected with the snowboard by means of a turning plate (2) and is not detached from the snowboard even in the case of a "turning release".

Abstract: The snowboard binding having a sole part integrated in the snowboard boot and a first binding element cooperating with it and continuously connected to the snowboard. The sole part has two spring-loaded pins projecting laterally out of the sole part and capable of engaging with an opening of the first binding element. The pins can be retracted with a device attached to the snowboard boot and thus the binding can be opened.

Abstract: A fin (1) for a windsurf board is constructed from fibers (5) which have a preferred fiber direction with the majority of the fibers lying in this direction, the preferred direction extending at an acute angle (a) to the longitudinal axis (4) of the profile of the fin blade (2). This allows the fin to distort and to change the properties of its profile in a defined manner when loaded.

Abstract: A binding for snowboards comprises a rotatable base plate (1) which, when mounted, is directly in contact with the surface of the snowboard (25). The base plate (1) includes a circular central opening (2) through which protrudes a circular fastening disc (14) formed with a projecting rim (15) which extends over the opening (2) in the base plate. The fastening disc (14) is adapted to be threadedly engaged with the snowboard (25), thus pressing the base plate against the snowboard. The fastening disc has oblong holes (18, 19, 20, 21) which allow longitudinal shifting of the entire binding.

Abstract: The assembly for fastening a fin to a sailboard comprises a fin receiving box secured in the sailboard and having an opening to receive a fin shaft. A conical or wedge seat is provided between the fin shaft and the opening in order to warrant a firm attachment of the fin.