Abstract: A device for securing a forked boom to a mast and includes clamping elements, which engage the mast and are provided on a retaining member which at least partly surrounds the mast. The retaining member is annular and is larger in diameter than the mast. At least one wedge-shaped clamping element is slidably mounted in the annular space between the retaining member and the mast.

Abstract: This invention relates to a boom end piece, which has at least approximately the shape of a U or V and is adapted to be connected by a plug joint to two tubular spars of a boom of a sailboard rig. The two leg ends of the end piece consist of pegs and the end piece consists of two one-half sections, which are rigidly connected to each other and each of which comprises two half pegs.

Abstract: A sailboard is provided with foot-retaining loops, which are made of flexible and/or elastic material and at their ends are secured to the board. In order to ensure a reliable release also in the case of twisting falls, at least one end of the foot-retaining loops is connected to the sailboard by a snap fastener, which can be opened by tension and/or torsion and/or a transverse displacement.

Abstract: In a sailboard rig, the boom is provided at its mast end with an extension using a torsion spring, which in an operative position extends in the plane of the boom and which is provided at its fore end with an eye for attaching a starting sheet.

Abstract: A mast foot for sailing boards comprising a holder securable to the sailing board and a connector which is connected to the holder by a universal joint and can be connected to the mast. The holder and connector are provided with curved faces which frictionally roll on each other during movement, in all directions, and which positively interengage to provide the universal joint. The holder and connector are held together by an elastic tension member. In one embodiment, the older is a half cup and the connector is a bearing sphere supported by the half cup. In another embodiment, the holder is provided with a ring having a bead-like edge and the connector has a complementary annual groove.

Abstract: The sailboard has an opening, which contains a tongue of a mast base, which is articulatedly connected to the mast, so that the mast base is detachably connected to the sailboard. One side face of the opening is provided with a detent cam, which is adapted to be depressed against spring force and has an oblique or curved camming surface, which is adapted to snap behind the step or stop as the tongue is inserted into the opening.

Abstract: A ski stop is associated with a heel tightener for safety ski bindings that comprises a boot heel-supporting turntable to which there are pivotably secured two pull members, one passing each side of the boot heel, which carry a sole retainer movable against the force of at least one spring. To permit stepping into the binding without prior manipulation and automatically bring the ski stop to a position ready for operation, a base plate fixed to the ski and carrying the turntable has a horizontal cross-shaft to which there is pivoted a pedal of the ski stop that is pivotable against the force of at least one spring to a position above the turntable at least approximately parallel to the base plate. At least one lever in the form of a braking skid is hinged to the pedal parallel to its pivotal shaft and the arm of the lever is guided for longitudinal movement in an eyelet on the ski.

Abstract: Safety ski bindings offer an adequate safeguard against erroneous release if they possess an adequately large resetting capacity. To test this resetting capacity, the ski boot is repeatedly displaced through a constant distance by a pressure pin applying a constant force thereto during constant time intervals. If the ski boot fails to return to its starting position during constant time intervals against a fixed resistance, then this is indicative of an inadequately large resetting capacity because the residual distances remaining after each displacement will be summated and eventually cause release of the binding.

Abstract: In a safety ski binding, a sole plate secured against lifting off is rotatably mounted on the ski surface in the heel region of the ski boot on a pivot extending perpendicular to the ski surface. The sole plate has a toe holder at its front end and a spring-loaded automatic heel mechanism for the ski boot at its rear end that opens to release the ski boot on the occurrence of a frontal fall load exceeding the spring resistance. To obtain complete release of the ski boot from the sole plate and thus from the ski on the occurrence of an excessive rotary fall load and for returning the sole plate to its normal position after the ski boot has been released, the sole plate has a slideway in the toe region as well as the heel region of the ski boot for securing the sole plate against lifting off and the automatic heel mechanism has a second degree of movement. Release of the ski boot is effected after the resistance of a separate spring has been overcome.

Abstract: A ski brake has two pivotable prongs, one on each side of the ski and having coaxial pivot shafts which are mounted on the ski to extend across the ski adjacent the upper ski surface and are each integral with an actuating arm depressible by a ski boot against spring action whereby to turn the pivot shafts and swing the brake prongs to an inoperative position. The spring action is exerted by way of a link member hinged to the ski by one end at a fixed position spaced lengthwise of the ski from the coaxial pivot shafts and connected by the other end to both actuating arms so as to be displaceable therealong when the actuating arms are depressed.

Abstract: A mast-connecting universal joint is provided, which is connected at one end to the mast and is permanently fixed thereto or can be only arbitrarily separated therefrom, and which is connected at its other end to a supporting member, which is biased by a resilient element and in position for use is positively held in a slide, which is longitudinally slidably guided and adapted to be resilient locked in a groove of the sailboard. The resilient element constitutes a return spring for the supporting member when the mast is in any position of use, and a return spring for moving the longitudinally slidable slide to a position in which the slide is releasably locked.

Abstract: A ski brake comprises two wings which swing to extend laterally from the ski when the latter becomes detached from the ski boot. The wings can swing about a respective pivot on a lever which is itself pivotally connected to a base plate secured to the ski. Confronting extensions of the brake wings each carry a hinge pin and the hinge pins are interconnected by a spring-biassed rod or by the flanged ends of a bending spring. The base plate also pivotally supports a pedal which is articulated to the lever and depressible by the ski boot to retract the brake wings.

Abstract: A holder for the toe end of the sole of a ski boot comprises two jaws biassed by a spring to an operative position at which the jaws lie against a common abutment and together define a mouth for accommodating the toe end of the sole. The abutment is a nut engaged on a screw. The faces of the jaws that make contact with the abutment or the faces of the abutment making contact with the jaws are tapered so that, upon axial movement of the nut caused by turning the screw, the width of said mouth is adjusted.

Abstract: In a sliding device for a ski boot that is to be released from a safety ski binding and that comprises a supporting plate securable to the ski and a slide plate displaceable on said supporting plate against the force of at least one spring, positive guiding means for the slide plate on the supporting plate are avoided insofar that only the spring is used to hold the plates together, there being substantially line contact between the two plates in a direction transverse of the ski.

Abstract: A holder for engaging the toe of a ski boot on a ski comprises two jaws which can be swivelled about respective vertical pivot pins from an operative sole-engaging position to an outswung sole-releasing position against the influence of a spring biassing the jaws to the operative position. Each pivot pin is rotatable but axially non-displaceable and is provided with a screw-threaded portion engaging in a tapped hole of the associated jaw. Identical pinions carried by the pivot pins are in mesh with a common intermediate gear which can be manually rotated to adjust the level of both jaws simultaneously to suit soles of different thicknesses.

Abstract: A ski stick comprising a tubular shank having a handle near one end is provided with an impact surface formed by an extension of said stick extending at an acute angle to the longitudinal axis of said shank and intersecting same.

Abstract: In a ski brake comprising a pedal for pivotally mounting on a ski and two brake prongs for projecting downwardly from the ski at opposite sides thereof, the pedal is formed from spring wire shaped to define two coplanar open loops. The adjacent ends of the loops are interconnected to form a junction which is spaced from the pivotal axis of the pedal. The junction is linked to a coupling member which extends beyond the pivotal axis and is there hinged at a point that is fixed with respect to the ski.

Abstract: A heel retainer for a safety ski-binding comprises a housing for attachment to the ski and a holder for engaging the sole of a ski boot. The sole holder is pivoted to the housing by a shaft displaceable in slots of the housing extending substantially parallel to the ski and is held in a sole-engaging or sole-releasing position by a first spring. A second spring biases the pivot shaft in the slots towards the ski tip. A pivotable entrainment member for the sole holder is engaged by said first spring. The sole holder is suspended from the entrainment member by a pin and slot connection.

Abstract: In a heel tightener for safety ski-bindings, a pusher member is movable away from the ski along the tension members against the force of at least one spring and a tightening lever is mounted to pivot about a transverse axis, the free end of the lever being engageable in the groove of the heel and pivotable upwardly into a heel releasing position. A counterbearing is provided to limit downward pivoting of the tightening lever into the clamping position. The tightening lever is secured in the clamping position by locking means which are released after movement of the pusher member by a predetermined distance away from the ski. The locking means comprise a lever arm linkage disposed between the pusher member and the tightening lever axially parallel to the latter, and a locking lever for the bell crank lever, which locking lever is pivotably mounted in the pusher member against the action of spring force.

Abstract: A vibratory system having one or more resonant frequencies between 1 Hz and 40 Hz is provided on the ski and exerts forces on the ski to oppose the excursions of the latter.