Abstract: A heel unit for an alpine touring binding, comprising a binding body which is suitable for holding a heel portion of an alpine touring shoe in a downhill position of the heel unit and for releasing the heel portion of the alpine touring shoe in an alpine touring position of the heel unit, such that the alpine touring shoe can lift off the heel unit, and a climbing aid which is adjustable between an active position and a passive position, wherein, while in the active position, the climbing aid supports the heel portion of the alpine touring shoe at a predetermined height above a sliding board plane in the alpine touring position of the heel unit, wherein the climbing aid is biased over the entire path of movement thereof into the active position by means of a flexible element and can be locked in the passive position.

Abstract: A snowboard binding including a highback and a plurality of straps. The highback forms an inward curve to define a cavity for a boot. A plurality of straps secure the boot in the cavity, the straps including a toe strap and an ankle strap. At least one of the highback, the toe strap, or the ankle strap have a section with an auxetic pattern.

Abstract: An improved highback adjustment system for a splitboard boot binding. A captive strut is mounted on the spine of the highback, the strut having a forward lean adjustor block such that rotation or sliding of the block lengthens or shortens the strut. The combination provides a broadly adjustable range of forward lean bias in small increments and the block is readily disengaged and stowed on the highback when not needed. Advantageously, the mechanism that can be operated and adjusted without tools, even with gloved hands, a significant benefit in winter conditions, and does not jam with snow. Methods of use of the improved forward lean adjustor and highback are also disclosed.

Abstract: Ski or similar device for sliding on snow having a mounting plate (12) for a binding or for parts thereof, such as a binding plate and/or heel plate, which mounting plate is mounted on, especially bonded or welded to, the top face of the ski, wherein the mounting plate (12) is of foil-like form and is bondable or weldable onto the top face of the ski in such a manner that it effectively defines a structural unit therewith.

Abstract: An apparatus and method for balancing a skier comprising a ramp angle toe on the toe bearing surface of a ski binding. The ramp angle plate has positions of varying heights for inducing a ramp angle when the toe of a boot rests on the ramp angle plate on the toe bearing surface of the binding. Thus, the ramp angle plate alters the ramp angle at which a boot supports a skier's foot and lower leg, relative to the longitudinal running surface or bottom plane of an attached ski. An apparatus that allows a skier to adjust the ramp angle on the slope without stepping out of the binding.

Abstract: A snowboard boot and binding system is disclosed which facilitates the engagement and disengagement of a snowboard boot and binding. The snowboard boot may include a boot engagement member extending from a rear of the boot. The boot engagement member is moved downwardly into a corresponding binding engagement member to provide an arrangement which prevents forward movement of the boot. The boot engagement member also may include one or more serrations to engage with one or more pawls on the binding to prevent upward movement of the boot. A snap-in arrangement may be provided in a boot toe region. The boot has protrusions extending outwardly from each side of the boot to engage with catches on the binding sidewalls. As the boot is pressed downwardly into the binding, the protrusions splay the catches until reaching recesses, at which point the catches rebound to capture the protrusions against upward movement.

Abstract: A ski binding device for fastening a boot on a ski is described. The device includes a toepiece and a heelpiece fixed to the ski and structured to selectively retain the boot. The heelpiece includes a turret and a hooking projecting appendix (“HPA”) that juts out from the turret towards the toepiece while remaining substantially parallel to a first reference axis. The turret having a lower casing which is fixed on a fastening base of the toepiece and a titlable upper casing resting hingedly connected thereto to the lower casing. The HPA protrudes from the titlable upper casing while remaining substantially parallel to the first reference axis, and the heelpiece includes a programmed-release locking means structured to lock and retain the upper casing until the titling torque transmitted to the upper casing exceeds a predetermined threshold value.

Abstract: A ski binding device for fastening a boot on a ski is described. The device includes a toepiece and a heelpiece fixed to the ski and structured to selectively retain the boot. The heelpiece includes a turret and a hooking projecting appendix (“HPA”) that juts out from the turret towards the toepiece while remaining substantially parallel to a first reference axis. The HPA includes a latch element insertable through the turret and configured to move forwards and backwards with respect to the turret parallel to the first reference axis. The heelpiece includes a manually-operated command device structured to displace the latch element forwards and backwards on the turret to stably lock the latch element in an advanced position and in a retracted position.

Abstract: A binding (1, 100) for a ski, in particular a ski binding for a cross-country or touring ski is described, in which a portion is adapted to interact with the ski, or a mounting plate (2, 110) attached to the ski, for attaching the binding to the ski in a displaceable manner, such that the binding can be positioned in a plurality of locations on the ski. A toothed interaction device (120), which is arranged so as to interact with matching indents or notches (112) on the ski or on the mounting plate (110), is provided, wherein the interaction of the teeth of the toothed interaction device with the matching indents or notches on the ski, or mounting plate, one or more than one of: determines, changes and/or fixes the position of the binding with respect to the ski.

Abstract: A toe piece (10) of a binding for shoes includes a support base (11) provided with a pair of jaws (13) arranged on opposite sides of the support base (11) and provided with respective pins (15), which extend transversely inwards and are adapted to engage respective seats (21) of metal material arranged in the toe of a footwear item (SB). The support base is further provided with an actuating system (17) operable for actuating the jaws to close or open for respectively locking or releasing the toe of the footwear item (SB). At least one of the pins has at least one portion of magnetized material, configured so that, when the toe of the footwear item (SB) is brought close to the jaws (13) in an open position, at least one of the jaws is urged by magnetic attraction of the respective pin (15) towards the respective seat (21) on the footwear item (SB), without operation of the actuating system (17).

Abstract: An assembly including a gliding board and a device for retaining an article of footwear on the board, the device extending longitudinally from a rear end to a front end, the board having a receiving zone provided to receive the retaining device longitudinally in relation to the board. The assembly includes a wedge device which inclines the retaining device longitudinally in relation to the board, so that the retaining device is angled downwardly from the front end to the rear end.

Abstract: A ski with a connecting device for connecting a ski binding to the ski. The connecting device includes a plate-type support body which has a fixing zone in its longitudinal middle portion for providing a rigid connection to the ski. At least the front end portion of the support body forms a flexural element extending freely with respect to the fixing zone and to the ski. The freely extending flexural element is made from plastic and is coupled with the ski via a coupling device. This coupling device comprises a connecting arm, which has a first articulated connection to the flexural element in its first end portion and a second articulated connection to the ski in its second end portion.

Abstract: A snow board comprises an elongate board and at least one binding mounted transverse the longitudinal axis of the board. The binding includes an anchor pivotally mounted on the binding. The anchor moves between two operative positions to lock, and then release, the heel of a boot in the binding. A motor assembly increases and decreases the tension in a cable to move the anchor between the two operative positions. The motor assembly is remotely controlled.

Abstract: A binding system comprising a binding upper comprising a plurality of fastening straps affixed to the upper and a substantially rigid binding base comprising a bottom surface for attachment of the fastening straps. The binding base includes a plurality of apertures, wherein one or more of the fastening straps passes through one or more of the apertures and is fastened to the bottom surface of the binding base. In various exemplary embodiments the fastening straps are stapled and/or glued to the bottom surface of the binding base. In various exemplary embodiments the fastening straps attach to the lacing loops on the binding upper or form the lacing loops on the binding upper.

Abstract: An assembly including a gliding board and a device for retaining an article of footwear on the board, the device extending longitudinally from a rear end to a front end, the board having a receiving zone provided to receive the retaining device longitudinally in relation to the board. The assembly includes a wedge device which inclines the retaining device longitudinally in relation to the board, so that the retaining device is angled downwardly from the front end to the rear end.

Abstract: A snow board comprises an elongate board and at least one binding mounted transverse the longitudinal axis of the board. The binding includes an anchor pivotally mounted on the binding. The anchor moves between two operative positions to lock, and then release, the heel of a boot in the binding. A motor assembly increases and decreases the tension in a cable to move the anchor between the two operative positions. The motor assembly is remotely controlled.

Abstract: A binding (1) holds a ski boot (2) on a cross-country ski (3). A pair of jaws (5a, 5b) in a retaining position (P1) engage and pivotally retain a front end of the boot and in a liberated position (P2) free the boot from the binding. A ski brake (4) includes braking elements (4a, 4b) which pivot between a braking position (PF) and a retracted position (PE). Inserting the boot into the binding and moving the jaws to the retaining position locks the brake elements in the retracted position. Opening the jaws to the liberated position to release the boot releases the brake elements to assume the braking position.

Abstract: An arrangement for the disengagement of a boot-attachment element on a sliding board comprising at least one receiving element (1, 2) for receiving a boot-attachment element on a sliding board, the arrangement comprising an automatic disengagement device for releasing the boot from the at least one attachment element, the disengagement device comprising a strip (5) and/or several articulated link rods (31, 32) forming a mechanical disengagement device and a lock (6, 10, 11) making it possible to lock or activate the mechanical disengagement device, the mechanical disengagement device being connected to at least one receiving element (1, 2) for receiving a boot-attachment element on a sliding board in order to allow its movement beyond a certain force sustained by the receiving element (1, 2) when the mechanical disengagement device is active.

Abstract: A geometry-shifting strap for a binding having a baseplate is disclosed. The geometry-shifting strap is shiftable between a closed position wherein the distal end of the geometry-shifting strap is biased or disposed over the baseplate, and an open position wherein the distal end of the strap is not over the baseplate. The strap includes at least one arcuate element that biases the strap to the closed position when the arcuate element is in a concave configuration, and biases the strap to the open position when the arcuate element is in a convex configuration.

Abstract: A ski with a connecting device for connecting a ski binding to the ski. The connecting device includes a plate-type support body which has a fixing zone in its longitudinal middle portion for providing a rigid connection to the ski. At least the front end portion of the support body forms a flexural element extending freely with respect to the fixing zone and to the ski. The freely extending flexural element is made from plastic and is coupled with the ski via a coupling device. This coupling device comprises a connecting arm, which has a first articulated connection to the flexural element in its first end portion and a second articulated connection to the ski in its second end portion.

Abstract: A snowshoe binding includes a base plate having opposing first and second lateral sides and a locating block located on the second lateral side and defining an inverted T-shaped retaining hole, a flat connection block defining therein a bottom accommodation chamber adapted for accommodating the locating block, a plurality of binding strap each having a first end connected to the first lateral side of the base plate and a second end coupled to the flat connection block, and a locking device adapted for detachably locking the flat connection block to the locating block.

Abstract: The present invention relates to a telemark ski binding system that includes a first coupling configured to couple a ski to the toe of a ski boot and a second coupling configured to attach the ski to the heel of the ski boot. The second coupling may attach to the ski separately from the first coupling. The first coupling attaches to the boot using a freely rotating, releasable toe coupling design. The second coupling incorporates a flexible attachment that facilitates vertical movement of heel of the ski boot with respect to the ski and connects to the ski underneath or near the bellows of the boot.

Abstract: A networked jump safety system and method for monitoring a jump area is described. The system comprises a safety analysis station connected via a network to least one monitoring station. The output of a sensor is analyzed at the safety analysis station to determine if it is safe for a rider to enter a jump area. A status corresponding to the determination is transmitted via the network from the safety analysis station to a light emitting output.

Abstract: An apparatus is provided for holding a footwear toe to a snow travel aid. The apparatus comprises jaws that grasp the toe while permitting pivotal movement of the footwear about the toe in forward and rearward directions and is for use with a heel holder that provides for lateral release. The apparatus comprises one or more resilient elements for biasing the jaws whereby the jaws are biased towards a closed position throughout the operational range of motion of the jaws. Also provided is an apparatus which comprises jaws that grasp the toe while permitting pivotal movement of footwear about the toe, wherein the apparatus is adapted for generally horizontal, forward and rearward translation relative to a longitudinal axis of the snow travel aid, selectively by a user.

Abstract: Binding systems for recreational boards are provided. A binding system is mounted atop a rider-support surface of the board. The binding system comprises: a pair of rails locatable on opposing sides of a generally flattened foot-receiving surface for the rider's foot, each rail comprising a central portion mountable to the recreational board, a toe-side leg which extends from the central portion toward a toe-side of the recreational board and a heel-side leg which extends from the central portion toward a heel-side of the recreational board. Each rail comprising at least one deformation-enhancing feature for enhancing an ability of the rail to deform elastically relative to the board.

Abstract: A slope compensation mechanism for automatically adapting an angle between a ski boot and a ski to a slope, including a tower mechanism having a tower base assembly mounted to the ski and a tower pivot mechanism rotatably and slidably mounted to the tower base assembly. A resilient pivot mechanism allows the tower pivot mechanism to rotate and to axially move with respect to the tower base assembly and a boot mounting beam engages with elevation angle catches corresponding to ranges of angles of a slope. A slope angle adaptation mechanism acting between the tower base assembly and the tower pivot mechanism determines a slope index angle corresponding to a slope being traversed and maintains the tower pivot mechanism at the slope index angle.

Abstract: The invention relates to a binding for a boot on a ski, including a toe-piece, a connection member having a front end secured to the ski and a rear end, the connection member being provided with a hook-engagement structure, a rear base adapted to be attached to the ski and a hooking mechanism associated with the rear base. The hooking mechanism includes a gripping member which is movable with respect to the rear base and is capable of moving into a first position in which it engages the hook-engagement structure of the connection member so as to limit a vertical movement of the rear end of the connection member, and a first return member exerting a force on the gripping member so as to move the latter toward the toe-piece. The binding also includes a heel-piece connected to the rear portion of the connection member. The longitudinal position of the heel-piece in relation to the connection member is adjustable.

Abstract: A binding with a medial and/or lateral side portion attached to a binding base and that can pivot or otherwise move about an axis that is generally along a heel-to-toe direction of the binding base. The medial and/or lateral side portions can form part of the binding sidewall and permit a rider to more freely move her feet in medial and/or lateral directions. One or more foot straps may engage with the medial and/or lateral side portions to secure a foot to the binding.

Abstract: The securing device, to be mounted on a ski-board, includes a main body with a support base for a sole, two lateral flanges, and an assembly for the attachment of the shoe to the main body, including: a protective element and first and second means for attaching the latter onto the first and the second flanges. The first means include two serrated straps, namely front and rear. The proximal end of at least one strap is mounted so that it pivots on the first flange. The distal ends mate with front and rear locking systems fixed onto the protective element, for adjusting the length of said straps. The second flange is fitted with front and rear attachment systems. The second means of attachment include a fixing handle, pierced with two holes, in which the attachment systems engage, and a closure system by which the handle is connected to the protective element.

Abstract: A convertible toe strap for securing a toe area of a snowboarding boot is selectively and repeatedly convertible between different restraining configurations. The convertible toe strap includes a first configuration where one of toe lift or forward movement is resisted and a second configuration where both toe lift and forward movement is resisted.

Abstract: Ski boots of different sizes, adapted for being used with skis provided with mounted bindings having front and rear jaws. The ski boots are embodied in at least two types (1, 1?, 1?) which differ from each other by sole length (a, b, c). Each of the ski boot types comprises at least two ski boot (outer shell) sizes having the same sole length. Each ski boot size is suitable for receiving inner boots in at least one inner boot size (foot size), and advantageously inner boots (3a to 3d, 3?a to 3?d, 3?a to 3?d) in at least two boot sizes (2a-2b, 2?a-2?-b, 2?a-2?b). Skis (6, 6?, 6?) may be provided with fixed jaws (7a, 7b, 8a, 8b, 9a, 9b) mounted in such a way that they correspond to the sole lengths (a, b, c) of the different types of boots (1, 1?, 1?).

Abstract: An assembly including a plate, a base, and a device for removably attaching the plate to the base. The plate is adapted to be associated with a device for removably retaining a boot, the base is adapted to be associated with a gliding board, such as a ski, the device for removably attaching the plate to the base including an arrangement for longitudinally guiding the plate with respect to the base. An immobilization mechanism is manually actuated to immobilize the plate with respect to the base along the longitudinal guiding direction.

Abstract: A toe binding of a safety ski binding includes a housing for at least partly mounting at least one release spring determining the safety release values and at least one sole holder loaded by the force of the release spring. When an upper force threshold is exceeded the sole holder releases the front section of a boot secured by the binding at least in lateral direction relative to the boot longitudinal axis. An adjusting device is adapted for individually changing the lateral alignment between the sole holder and the housing transversely to the binding longitudinal axis of the binding and substantially parallel to the standing plane for a boot, so that an angle or a lateral deflection between the boot longitudinal axis of a boot inserted into the binding and the binding longitudinal axis of the safety ski binding can be changed and individually preadjusted within predefined adjusting limits.

Abstract: A binding for water sports comprises a baseplate, which may optionally include a toe cup, and a heel cup. A heel loop is pivotably attached to the heel cup, and is pivotable between an upper position and a lower position to adjust the amount of support provided to the user's ankle. An adjustment control, for example a lever and cam mechanism pivotably attaches to the heel cup and is positioned such that the user can selectively move the cam portion between a release position wherein the heel loop is not supported in the upper position, and a support position wherein the heel loop is supported in the upper position. A flexible upper portion is attached to the base plate.

Abstract: A ski binding for downhill skiing and cross-country skiing has a plate which can be pivoted upwards in the front region about an axis located transversely to the longitudinal direction of the ski. A front ski binding and a rear heel holder for a ski boot or cross-country ski boot are fastened on the plate. At least one catch element which is arranged in front of, or in the region of, the rear sole holder can be used to secure the plate, in its rear region, on the abutment fitted on the ski. In addition, at least one catch element is arranged in the front region of the plate. The plate is fixed on the ski, and reinforced, in the manner of a conventional downhill ski binding by the further catch element in the front region of the ski binding and, in the locked state, is anchored at the front end and at the rear end, and at a number of locations therebetween, on parts of the ski or parts which have been fixed to the ski.

Abstract: A jump safety system and method for monitoring a jump landing area is described. The system of examining a landing area associated with the jump includes a camera, a memory, a processor, an image processing module, and a light emitting output. The camera is positioned to generate a camera output that displays the landing area. The landing area has a declining slope angle that reduces a landing force in relation to the slope angle. The image processing module, which is controlled by the processor, determines a landing area clear status by analyzing the camera output and determining the landing area is clear of obstructions. A landing area obstruction status is determined by identifying that there is an obstruction in the landing area. The light emitting output communicates either the landing area clear status or the landing area obstruction status.

Abstract: The invention relates to an ankle strap assembly for a snowboard binding. The strap assembly includes a middle strap portion having a stiffening panel with a longitudinal slot defining upper and lower rails, and at least one stiffening member that engages the upper and lower rails. The invention also relates to a method for adjusting the stiffness of a strap assembly for a snowboard binding.

Abstract: An apparatus and method for balancing a skier comprises a Heel Mounting (“HMP”) that locks on to the heel bearing surface of a ski binding. The HMP has a specified thickness to increase the height of the heel portion a ski boot over the toe portion when mounted in the ski binding. Thus, the HMP plate alters the ramp angle at which a boot supports a skier's foot and lower leg.

Abstract: A binding for fixing a shoe to a snowboard and the like comprising a base body that can be fixed to a snowboard and the like by an angular positioning disk with engagement of contact elements defined by the base body on the snowboard, elements for fastening a shoe being associable with the base body and elastic shock-absorbing elements being also associable and interposable between the snowboard and the like and the base body, the shock-absorbing elements at least partially surrounding the external lateral profiles of the rear region of the base body.

Abstract: A system for alpine touring, a low-profile, selectively pivotal riser, and a method of releasably locking a ski boot heel. In an embodiment, the system for alpine touring includes a pair of skis; a pair of low-profile, selectively pivotal risers, and a pair of alpine ski boot bindings. In one embodiment, the riser includes an alpine binding attachment plate, a first anchor portion for pivotally attaching the riser thereto; and a second anchor portion for selectively attaching the riser thereto.

Abstract: The automatic release control system for controlling the connection between two elements, refers to a system for efficiently controlling the connection between two elements, preferably between a user and an apparatus, such as a ski or snowboard, on which the user's leg or foot is retained. The mechanism ensures that whatever the direction, application point and strength of the resultant of the forces transmitted by the apparatus to the leg, the releasable retaining system will release under the action of a potentially injurious force and remain in retaining state if no injurious forces are involved.

Abstract: A geometry-shifting strap for a binding having a baseplate is disclosed. The geometry-shifting strap is shiftable between a closed position wherein the distal end of the geometry-shifting strap is biased or disposed over the baseplate, and an open position wherein the distal end of the strap is not over the baseplate. The strap includes at least one arcuate element that biases the strap to the closed position when the arcuate element is in a concave configuration, and biases the strap to the open position when the arcuate element is in a convex configuration.

Abstract: The present invention relates to a snowboard binding. The snowboard binding comprises: a base, a high back, a foot cover, a first wire, and a lever. The base comprises a plate attached to the snowboard, and side walls extending vertically from both sides of the plate. The high back is installed to pivot on the side wall in the rear of the base. The foot cover is installed at a distance from the upper front of the base. The first wire connects the high back to the base and foot cover. The lever is installed to pivot on the back of the high back and moves the foot cover as the length of the first wire connecting the lever to the high back varies depending on the pivot direction, wherein the first wire connected to the high back is connected to the side facing the pivot axis. Therefore, the foot cover and high back simultaneously fix the front and rear of boots as a result of the pivoting of the lever in the locking direction, and release of the lever is prevented.

Abstract: Disclosed is a snowboard binding for coupling a snowboard boot to a snowboard. The binding includes a highback that extends upwardly from a midfoot or heel region of the binding to provide rear support for the boot. In one embodiment, the highback is formed of a plurality of modular components that each can be manufactured of a separate material to collectively provide desired structural characteristics to the highback. The attachment of the highback, its supporting elements and one or more straps to retain the boot within the binding are arranged such that certain attachment points are fixedly connected to each other and thus made to move synchronously when the position of the highback with respect to the binding's base is adjusted.

Abstract: A binding comprising a baseplate that is adapted to attach to a gliding board such as a snowboard, the gliding board having lateral and medial sidewalls and a heel loop, and a pivotably highback pivotably mounted to the baseplate. The heel loop includes at least one forwardly disposed tooth, and the highback includes a plurality of rearwardly disposed teeth. The maximum forward lean angle is established by the engagement of the heel loop and highback teeth. In one embodiment the highback adjustably attaches to the baseplate with hardware extending through arcuate slots, such that the maximum forward lean angle is determined by the position of the hardware in the slots.

Abstract: A convertible toe strap for securing a toe area of a snowboarding boot is selectively and repeatedly convertible between different restraining configurations. The convertible toe strap includes a first configuration where one of toe lift or forward movement is resisted and a second configuration where both toe lift and forward movement is resisted.

Abstract: A convenience-type tool-less manual quick release binding system is provided for directly mounting accessories and equipment, such as a video kit, thermos, storage container, first aid kit, portable radio or audio device, or other accessory, onto a snowboard via the snowboard binding. When binded, the accessory is secure from unwanted release caused by rigorous use but detachable with ease when desired providing fast on and off action. In one embodiment, ladder straps are attached to the snowboard binding, and the accessories attached to the ladder straps.

Abstract: The invention relates to a combination of ski boots of various sizes and skis with a fitted binding, comprising a toe jaw and a heel jaw, the relative separation of which may be altered and fixed relative to the ski by means of a guide device arranged on the ski. The ski boots belong to at least two ski boot types (1, 1?, 1?), which differ in the length of the sole (a, b, c), each of which are suitable for the fitting of inner boots (3a to 3d, 3?a to 3?d, 3?a to 3?d) in at least two boot sizes. The skis comprise binding jaws, arranged to be adjustable such that the relative separation thereof may be matched to the differing lengths of sole, whereby markings on the types of ski boot and markings on the guide device of the binding permit an unambiguous matching of the sole length to the corresponding jaw separation.

Abstract: A method and apparatus for providing a gliding board binding, such as a snowboard binding. The binding may include an adjustment indicator that allows for determination of a longitudinal position of the base relative to a gliding board, heel-to-toe position of the base relative to a gliding board and/or an angular position of the base relative to a gliding board when the base is secured to the gliding board. The adjustment indicator may be included with a footbed that is removable from a binding base, e.g., that includes a foot engagement member to secure a rider's foot to the binding and board. A removable footbed may include a toe portion that is adjustable in position relative to a heel portion of the footbed. A gliding board may include a channel for mounting a binding that is arranged in the board core so that no portion of the board core is located on top or bottom sides of the channel, and instead so the top and bottom reinforcement layers are located above and below the channel.

Abstract: A platform is foreseen according to the invention by which an elastically deformable base plate (11) is adapted to receive a front positioning plate (12) as well as a rear positioning plate (13), which are both positioned on the base plate (11) depending on each desired position of both assemblies (71, 72) of a ski binding (7). Since the platform should allow a freely bending of a ski (5) by enabling simultaneously an efficient dampening of vibrations, a front bearing plate (2) is foreseen on the front positioning plate (12) for the purposes of bearing a front assembly (71) of the ski binding, and is attached to the front positioning plate by means of a pair of levers (21, 22), which are pivotally connected to the positioning plate and to the bearing plate. A rear bearing plate (3) is foreseen on the rear positioning plate and is attached to the rear positioning plate by means of a pair of levers (31, 32), which are pivotally connected to the positioning plate and to the bearing plate.