Adapter device for attaching a ski boot to a touring ski binding

Abstract

The present invention relates to an adapter device (1) for attaching a ski boot (2) to a toe piece device (4) of a touring ski binding (6). The adapter device (1) can be attached to a forefoot part (8) of the ski boot (2) and has a first end (10) and a second end (12), wherein the first end (10) can be attached to the lateral side (11) of the ski boot and the second end (12) can be attached to the medial side (13) of the ski boot (2). A fastening device (14) for attaching the adapter device (1) to the ski boot (2) is provided on the adapter device (1), wherein the adapter device (1) has a first projection (16) at the first end (10) and a second projection (18) at the second end (12).When the adapter device (1) is in a state attached to the ski boot, the first projection (16) extends in the lateral direction (L) and the second projection (18) in the medial direction (M), wherein the longitudinal axes (L1, L2) of the first projection and the second projection are aligned with one another to provide a pivot axis (S) for pivoting the ski boot (2) about the touring ski binding (6). The present invention further relates to a ski boot (2), a touring ski binding (6), and a binding system (100).

Description

Technical FieldThe present invention relates to an adapter device for fastening a ski boot to a touring ski binding, and to a ski boot and a binding system for touring ski.Prior ArtSki bindings for touring ski can be switched between a climbing mode and a downhill mode. In the climbing mode, only the front region of the ski boot is fixed on the ski and the rear region of the ski boot can be raised from the ski and placed thereon. In this way, the user can perform a walking movement with the touring ski. In this case, the front region of the ski boot pivots about a horizontal axis of the touring ski binding lying transversely to the longitudinal axis of the ski.In the departure mode, both the front and the rear region of the ski boot are firmly fixed on the ski. The departure performance of a touring ski is generally limited by the need to provide the ascent function. Thus, known touring binding systems in the form of so-called web systems generally have a higher standing height compared to pure departure binding systems, which is disadvantageous for the driving properties.In addition to the bridge systems, there are so-called pin systems. Known pin systems have the disadvantage that a lateral release behavior, in which the ski boot can become laterally released from the binding in the departure mode in the event of an increased force effect, is impaired by the pins which penetrate into the ski boot. Furthermore, known pin systems use frictional connection-based front jaw devices, which require many components and are thus heavy.DE 10 2021 134 650 A1 proposes an alternative binding system for a touring ski binding, comprising a front jaw device and a rear jaw device. In an ascent mode, the back jaw device is opened so that the heel of the user is free to walk, and the front jaw device is closed to provide a pivot axis in the front shoe region so that the user can perform a walking movement. In a departure mode, the front jaw device is open and the rear jaw device is closed. In this case, the closed rear jaw device presses the ski boot along the longitudinal axis of the boot against a form-fit-based holder of the front jaw device. In this way, the front jaw device can be provided without its own frictional engagement mechanism, so that material outlay and weight are saved. However, this solution presupposes that the ski boot has a bolt-shaped web which extends transversely to the longitudinal axis of the boot from the medial to the lateral side of the boot. Furthermore, the bridge must be arranged either in front of the shoe tip or below the sole in order to be able to be brought into engagement with the front jaw device. The provision of such a bridge on a ski boot is complicated in comparison with shoes for pin systems and the bridge could prevent or restrict walking without a ski.In the context of the present invention, it has been recognized that pin systems allow a simple and robust ski boot, but require a disadvantageous binding. At the same time, there are alternative, advantageous binding systems which, however, require a disadvantageous shoe construction.SUMMARY OF THE INVENTIONProceeding from the known prior art, it is an object of the present invention to provide an adapter device for a ski boot.The object is achieved by an adapter device having the features of claim 1. Advantageous refinements emerge from the dependent claims, the description and the figures.Accordingly, an adapter device for fastening a ski boot to a front jaw device of a touring ski binding is proposed. The adapter device is attachable to a forefoot part of the ski boot and has a first end and a second end, wherein the first end is attachable to the lateral side of the ski boot and the second end is attachable to the medial side of the ski boot. A fastening device for fastening the adapter device to the ski boot is provided on the adapter device, wherein the adapter device has a first protrusion at the first end and a second protrusion at the second end. When the adapter device is in a state attached to the ski boot, the first protrusion extends in a lateral direction and the second protrusion extends in a medial direction, wherein the longitudinal axes of the first protrusion and the second protrusion are arranged in alignment with each other to provide a pivot axis for pivoting the ski boot about the touring ski binding.For the spatial and geometric description of the proposed solutions, both a Cartesian coordinate system X-Y-Z and anatomical direction designations analogous to a foot are used in the present case. In this case, the longitudinal axis of the shoe is the X axis. The shoe transverse axis is the Y axis and the shoe vertical axis is the Z axis. If a user wears the shoe, the X-Z plane is accordingly parallel to the anatomical mean sagittal plane of the user. Thus, "medial" denotes a direction pointing towards the central sagittal plane of the user and "lateral" denotes a direction pointing away from the central sagittal plane of the user. In other words, when the user wears the shoe, the big toe abuts a medial side of the shoe and the small toe abuts a lateral side of the shoe.As described above, the adapter device has a first end and a second end, wherein the first end is attachable to the lateral side of the ski boot and the second end is attachable to the medial side of the ski boot. In other words, when the adapter device is attached to the ski boot-in short: in the attached state-the first end is arranged on the side of the small toe and the second end is arranged on the side of the large toe.Because the first protrusion comprised by the first end extends in a lateral direction and the second protrusion comprised by the second end extends in a medial direction, the first and second protrusions extend in opposite directions along the shoe transverse axis, i.e. the Y axis. Because the longitudinal axes of the first projection and of the second projection are furthermore arranged aligned with one another, the longitudinal axes of the first projection and of the second projection are parallel to the shoe transverse axis, that is to say the Y axis. Accordingly, the pivot axis provided by the first and second projections is parallel to the shoe transverse axis, i.e. the Y axis.Because the adapter device can furthermore be fastened to the forefoot part of the ski boot, a pivot axis for a ski boot can be provided in a simple manner. In particular, existing shoes can thus be re-fitted for alternative binding systems which cannot be included either in the web systems or in the pin systems. Thus, a user does not need to buy a special shoe for such a proprietary alternative binding system or to convert an existing shoe in a complicated manner.Because the first end of the adapter device can be fastened to the lateral side of the ski boot and the second end can be fastened to the medial side of the ski boot and the two ends have the projections providing the pivot axis, it is possible to dispense with a bolt-shaped web which extends continuously from the medial side to the lateral side of the boot.In particular, it is therefore not necessary to provide a bolt-shaped web on the ski boot, which web is arranged in front of the tip of the boot or below the sole, as required by the prior art. In this way, the adapter device improves walking without ski in comparison to the prior art. Furthermore, the proposed protrusions have a greater robustness, for example a lower risk of bending or breaking, than a continuous web.Furthermore, the first projection and / or the second projection can be bolt-shaped. In the present case, bolt-shaped means a projection having a substantially round cross section, for example a circular or elliptical cross section. Alternatively, the first protrusion and / or the second protrusion may have a polygonal cross section.Furthermore, the fastening device can have a third protrusion at the first end and a fourth protrusion at the second end, wherein, when the adapter device is in the state fastened to the ski boot, the third protrusion extends in the medial direction and the fourth protrusion extends in the lateral direction. In other words, the third and fourth projections point towards each other. In particular, the third and fourth projections in the fastened state are thus directed substantially toward the shoe center or extend in each case toward the shoe. The third and fourth projections can thus be brought into engagement with the ski boot, so that the adapter device can be fastened to the ski boot in a simple manner.According to a further development, the third projection and / or the fourth projection can be configured to be in engagement with a recess of the forefoot part in each case in the state fastened to the ski boot, in particular to be in engagement in a positively locking manner. For example, the third protrusion and / or the fourth protrusion can engage in the fastened state in a so-called pin eyelet of a typical pin ski boot for a pin binding system. In this way, the adapter device can be used particularly easily for a multiplicity of conventional ski boots. In particular, the third or fourth projection can be shaped in such a way that it can engage with the pin eyelet in a radially positive-locking manner. The assembly can thus be carried out particularly easily, reliably and precisely in position.Furthermore, the first protrusion and the second protrusion can be fixed to the forefoot part of the ski boot in a fixed position in the state fastened to the ski boot. In other words, the first and second projections do not substantially change the position, arrangement or orientation relative to the ski boot or to the remaining components of the adapter device even in the course of releasing the adapter device from the ski binding. Thus, the adapter device can be used for a form-fit-based binding system.Furthermore, the first projection and / or the second projection can be configured to be positively engaged, in particular substantially positively engaged, with the front jaw device of the touring ski binding.Furthermore, the first protrusion and the second protrusion can each have an engagement portion which is configured to be engaged with the front jaw device of the touring ski binding, wherein the first protrusion and / or the second protrusion in the engagement portion have a circular, elliptical or polygonal cross section. In particular, the engagement portion of the first and second projections can be positively engaged with a holding device and / or a locking device of the front jaw device. For example, the first and second projections can each have an end section on which an insertion aid, a positioning aid or a protective cap is arranged. In contrast, the pivot axis can be provided in a targeted manner by means of the engagement section in that the engagement section is shaped in a manner corresponding to the holding device, such that the front jaw device or the holding device provides a pivot bearing for the adapter device. Thus, the adapter device can be used even better for a form-fit-based binding system.According to a development, the first projection and / or the second projection in the engagement portion can have a cylindrical axis, an elliptical axis, an axis in the form of a single shell hyperboloid or an axis in the form of a double cone. The shape of a single shell hyperboloid and the shape of a double cone may allow the corresponding components of the front jaw device to automatically contact a predetermined position in the engagement portion when the adapter device is engaged with the front jaw device.Further, the first end may have a first outer side facing in the lateral direction and the second end may have a second outer side facing in the medial direction. For example, the first and second outer sides can be configured to be positively engaged with a holding device of the front jaw device, preferably to be substantially positively engaged, in particular in the form of a substantially positively locking connection along the pivot axis. In other words, by means of the aforementioned engagement position of the first and second outer sides, a movement of the adapter device along the pivot axis can be blocked, for example a translation along the pivot axis, a rotation in the direction of the pivot axis, or a combination thereof.According to a further development, the first and second outer sides can be arranged substantially perpendicular to the pivot axis. In this way, the protruding blocking of a movement of the adapter device along the pivot axis can be effected in a particularly robust manner.Additionally or alternatively, the first outer side may provide a first contact surface and the second outer side may provide a second contact surface, wherein the first and second contact surfaces may be arranged substantially perpendicular to the pivot axis. For example, the first and second contact surfaces may be provided in the form of an elevation or depression opposite the surrounding first and second outer surfaces, respectively. In this way, the provision of the engagement position, in particular of the above-mentioned positive engagement or locking, can be decoupled from the design of the first and second outer surfaces of the adapter device.Furthermore, the third protrusion and the fourth protrusion may be arranged in alignment with the pivot axis. In other words, the longitudinal axes of the first to fourth projections may be aligned with each other. Thus, the first and second protrusions may be aligned with the pin ears of conventional ski boots such that the pivot axis provided by the first and second protrusions coincides with the ski boot pivot axis. In this way, the pivoting geometry of the adapter device and of the conventional ski boot correspond, so that no further adaptation of the ski boot is necessary.Furthermore, the first (second) projection can thus be formed integrally or in one piece with the third (fourth) projection, for example in the form of a bolt which projects through the first (second) end of the adapter device and can be connected to the end in a materially integral manner, for example by means of welding. In this way, the adapter device can be manufactured particularly simply and robust.Furthermore, the fastening device can comprise a bracket which extends from the first end to the second end. The first and second ends can be surrounded by the fastening device or by the bracket. For example, the bracket can be formed from spring steel and be prestressed in such a way that the inner distance from the first end to the second end is smaller in the unfixed state of the adapter device than in the fixed state on the ski boot. In other words, the fastening device can provide a clamping force for fastening the adapter device to the ski boot by means of the bracket connecting and prestressed to the second end.Furthermore, in the state fastened to the ski boot, the fastening device can have a substantially U-shape in a cross section along a transverse plane, wherein the transverse plane is parallel to a plane spanned by the shoe longitudinal axis and the shoe transverse axis. In the context of the present disclosure, a U-shape is understood to mean that two legs are connected by a central part. The two legs are arranged opposite and substantially parallel to each other. The central portion extends from an upper / lower end of one leg to an upper / lower end of the other leg. The longitudinal axis of the central part is substantially transverse to the longitudinal axes of the legs. The transition regions between the limbs and the central part can be curved, that is to say have a radius, for example, or have a radius-free edge. The U-shape does not necessarily have to be mirror-symmetrical to a central plane. For example, a first transition region may have a smaller radius than a second transition region, or vice versa.Because the fastening device can have a U-shape, the adapter device can be fastened to the ski boot in a particularly simple manner, in particular to a forefoot part of a ski boot which is formed in a U-shape. Furthermore, the U-shape can be used to provide the above-described prestress in a simple and robust manner.Furthermore, the fastening device can have a bore for fastening the adapter device to the ski boot by means of a fastening bolt, in particular a screw or a rivet. For example, the bore can be provided in the central part of the U-shape or in the bracket. In this way, by means of the fastening bolt, a force-locking fastening of the adapter device on a forefoot part of a ski boot can be provided in the frontal plane. Furthermore, a plurality of such bores can be provided on the fastening device.Additionally or alternatively, the fastening device can have a suspension line which can be fastened to the ski boot or to a user. For example, the suspension line can be fastened at one end to the adapter unit by means of a screw connection. The tether may include a loop or other releasable fastener at another end for releasably securing to the ski boot or otherwise to a user. By means of the safety line, the risk of losing the adapter device during a ski trip can be reduced, for example if the user with the adapter device mounted is walking and strikes against an obstacle with the adapter device, or in the case of a severe fall during a departure.The object set forth above is further achieved by a ski boot comprising an adapter device according to the preceding description. Advantageous refinements emerge from the present description and the figures. Furthermore, the ski boot can have a forefoot part which can be substantially U-shaped. For example, the forefoot part can have a front side and two pivoting sides substantially perpendicular thereto, wherein the pivoting sides are aligned substantially parallel to the sagittal plane.Furthermore, the forefoot part can have two shoe recesses, for example in the form of pin eyes, for receiving the third and fourth projections of the adapter device. In particular, the two shoe recesses can be arranged aligned with one another and parallel to the pivot axis.Furthermore, the two shoe recesses can each be arranged on a pivot side or in a transition region between a pivot side and the front side. In this way, the adapter device can be fastened to the forefoot part in a simple and robust manner by means of the fastening device.The object set out above is furthermore achieved by a touring ski binding having the features of claim 14. Advantageous refinements emerge from the dependent claims, the present description and the figures. The touring ski binding comprises a front jaw device having a holding device and a locking device. The holding device has a first end section, a second end section and a central section connecting the first and second end sections, wherein the central section can be fastened to a ski and the first and second end sections are arranged substantially stationary and substantially perpendicular to the central section and substantially parallel to one another. The first end portion has a first recess and the second end portion has a second recess, wherein the first and second recesses are configured to receive a shaft. The locking device has two pivot arms, each of which has a hook-shaped recess and which are pivotably fastened to the first and second end sections between a locking state and a release state. In the locked state, the pivot arms are pivoted in such a way that the hook-shaped recesses are aligned with the first and second recesses of the holding device, so that the front jaw device provides a pivot bearing for pivotably mounting the shaft about a pivot axis. In other words, the touring ski binding can comprise a front jaw device which is configured to pivotably lock the adapter device.The touring ski binding can be made of metal, for example, so that the components of the holding device and of the locking device are provided with sufficient bending stiffness, torsion resistance and abrasion resistance. In this way, it can be achieved, for example, that the first and second end sections are arranged substantially stationary.In the present case, the term "stationary" is understood to mean that the corresponding components, here in particular the first and second end sections of the holding device, do not substantially change their position under normal operating conditions or when changing between provided set-up or operating states of a ski binding. To delimit the term "stationary", reference is made as a counter example to a conventional pin binding, the pins of which can be brought into an engagement position by pivoting into corresponding pin eyes of a ski boot by means of a spring-loaded pivoting mechanism and can be released again from the engagement position by pivoting out. In this case, the pins and the corresponding structural components in the form of pivot arms are just not stationary, since their position or position is positionally variable according to the design. Furthermore, for example, the proposed locking device is pivotable, i.e. spatially variable, while the proposed holding device is substantially stationary.Because the first and second end sections of the holding device are arranged substantially stationary, a stationary bearing for the shaft can be provided. The bearing can be provided in particular by means of corresponding form-locking means provided by the holding device or the locking device. Thanks to the fixed mounting, a spring mechanism on the front jaw device can be dispensed with, as is customary in conventional pin bindings. In this way, weight and effort for components can be saved.The shaft, which is not necessarily a component of the suggested touring ski binding, can be provided, for example, in the form of the first and second projections described above, in particular if they are provided on a ski boot in alignment with one another.By providing the pivot bearing for the shaft in the locked state, it is possible to prevent the shaft from moving radially out of the front jaw device during rotation or pivoting about the pivot axis. Thus, the locked state can be provided for an ascent mode of the touring ski binding.Furthermore, the first and second end sections can be configured to be positively engaged with a first and second outer side of an adapter device which can be fastened to a ski boot or with a lateral and a medial side of a ski boot, in particular in the form of a positively locking connection along the pivot axis. In particular, the locking along the pivot axis can be effected substantially positively, or exclusively by means of a positive connection. Accordingly, the locking along the pivot axis can be effected or provided without frictional engagement.In other words, the first and second end sections of the holding device can be configured to provide a form-fit locking along the pivot axis for the adapter device described above, in that the first and second outer sides of the holding device have a geometrically complementary shape to the adapter device.Furthermore, the first end section can have a first holding surface and the second end section can have a second holding surface, wherein the first and second holding surfaces are arranged opposite one another, such that an axial bearing for the shaft is provided by means of the first and second holding surfaces. The position and degrees of freedom of the axial bearing provided relate to the position of the pivot axis about which the shaft is pivotable. In particular, the holding surfaces can be provided in a fixed manner on the holding device. Because the holding surfaces are arranged opposite one another, a movement of the shaft along the pivot axis can be blocked by means of the holding surfaces. Typically, the shaft has flanges, in the present case in the form of the above-described first and second outer sides of the adapter device or in the form of the lateral and medial sides of the forefoot part of the proposed ski boot.By means of the axial bearing provided predominantly by positive locking, a substantially better force transmission to the edge of the ski can be provided during the skiing than in the case of conventional pin binding systems in which an axial bearing is provided via spring-loaded frictional locking. This is because if, in the case of conventional pin binding systems, an axial force parallel to the pivot axis, which acts from the ski boot against the spring-loaded axial bearing, balances or exceeds the counterforce of the spring load, then unwanted axial play arises, with the result that the force flow from the leg of the user to the ski edge (or vice versa) is disturbed. In contrast, owing to the proposed positive-locking axial mounting, which can be attributed to the first and second end sections of the holding device, which are arranged in a fixed manner on the central section, such an axial play does not occur in particular, so that the force flow from the leg or shoe of the user via the binding to the ski is not disturbed even under very high loading of the ski edge. Moreover, since the springs used in conventional pin connections can be saved, a touring ski binding which is improved in the force transmission and at the same time lighter is provided.The object set out above is furthermore achieved by a binding system having the features of claim 17. The binding system comprises a touring ski binding and an adapter device according to the preceding description. Advantageous refinements emerge from the dependent claims, the description and the figures.Furthermore, an inner distance between the first and second holding surfaces can substantially correspond to an outer distance between the first and second outer sides of the adapter device. In other words, the inner distance and the outer distance can be matched to one another in such a way that the axial bearing described above is provided. For example, the first and second outer sides can be engaged with the first and second holding surface, wherein the positive fit blocks a movement transversely to the first / second holding surface or first / second outer side.In particular, the inner distance can be substantially the same as the distance between the first and second contact surfaces ( 10 b, 12 b).Furthermore, in an operating state in which the adapter device is fastened to the ski boot and the adapter device is in engagement with the front jaw device of the touring ski binding, the adapter device can be axially mounted by means of the holding device parallel to the pivot axis in order to block a movement of the adapter device parallel to the pivot axis or along the pivot axis.Furthermore, the holding device can provide a stationary axial bearing for axial mounting of the adapter unit along the pivot axis. In other words, the holding device can be configured to block a movement of the adapter unit along the pivot axis by means of form-fit. In other words, the axial bearing or the locking along the pivot axis can take place free of a force-fit-based mechanism. Thus, the axial mounting or the locking takes place in a form-fitting and non-positively locking manner.Brief Description of the FiguresPreferred further embodiments of the invention are explained in more detail by the following description of the figures. The following are shown schematically: FIG. 1 shows a sectional top view of an adapter device fastened to a ski boot according to an exemplary embodiment; FIGS. 2 ato 2 c show a sectional plan view of an adapter device fastened to a ski boot according to further exemplary embodiments; FIGS. 3 aand 3 b show each a detail of a side view in a departure mode and in an ascent mode of a touring ski binding according to an exemplary embodiment; FIGS. 3 cand 3 deach show a detail of a side view in a departure mode and in an ascent mode of a touring ski binding according to a further exemplary embodiment; FIG. 4 shows a front view of a rear side of a binding system according to an exemplary embodiment; FIGS. 5 aand 5 b show different shaped first / second projections of an adapter device according to further exemplary embodiments FIG. 6 a shows a partially cut-away top view of an adapter device fastened to a ski boot according to an exemplary embodiment and a binding system; FIG. 6 b shows a detail plan view of an exemplary adapter device which is arranged in a touring ski binding; and FIGS. 7 aand 7 b show a binding system according to an embodiment.DETAILED DESCRIPTION OF PREFERRED EMBODIMENTSSome exemplary embodiments are described below with reference to the figures. Identical, similar or identically acting elements are provided with identical reference symbols in the different figures, and a repeated description of these elements is partly omitted in order to avoid redundancies.FIG. 1 schematically shows a sectioned plan view of an adapter device 1 fastened to a ski boot 2. To illustrate the spatial relationships, the toes of a user are shown in the ski boot 2. Accordingly, the large toe lies in the medial direction M and the small toe lies in the lateral direction L, as viewed from the foot center. The ski boot 2 has at its tip a forefoot part 8, on the lateral 11 and medial 13 sides of which a recess 24 in the form of a pin eyelet 24 is arranged. The pin eyes 24 are cylindrical bores in the ski boot for receiving pins of a conventional pin binding system. The forefoot part 8 has a substantially U-shaped outer contour provided by the lateral side 11, a frontal side and the medial side 13 of the forefoot part 8.The adapter device 1 comprises a substantially U-shaped bracket 32 extending from a first end 10 to a second end 12. In a state in which the adapter device 1 is fastened to the ski boot 2, hereinafter briefly "in the fastened state", the first end 10 is arranged on the lateral side 11 and the second end 12 is arranged on the medial side 13 of the ski boot or the forefoot part 8.The adapter device 1 has a first projection 16 in the form of a cylindrical bolt at the first end 10 and a second projection 18 in the form of a cylindrical bolt at the second end 12. The first and second projections 16, 18 are adapted to be engaged with a front jaw device 4 of a touring ski binding 6 (see Figs. 3a, 3b, 4 and 6-7b). The longitudinal axes L 1, L 2 of the first and second projections 16, 18 are parallel to the ski boot transverse axis Y and are aligned with one another. In this way, the adapter device 1 provides a pivot axis S for pivoting the ski boot 2 about a touring ski binding 6 by means of the first and second projections 16, 18.The adapter device 1 has a fastening device 14, by means of which the adapter device 1 is fastened to the forefoot part 8. The fastening device 14 comprises bores 34, screws 36, spacers in the form of washers 37, and a third and fourth projection 20, 22, The screws 36 are guided through the bores 34 and the washers 37 and screwed to the front side of the forefoot part 8. The adapter device is thus fastened in a force-fit manner on the front side. The third protrusion 20 is arranged at the first end 10 and extends in the medial direction M, so that the third protrusion 20 is radially positively engaged with the pin eyelet 24. In the axial direction, the third projection 20 is fixed on the front side on the one hand thanks to the screw connection. Furthermore, the bow 32 is provided with a certain prestress which presses the bow against the lateral and medial sides 11, 13 of the ski boot in the region of the first and second ends 10, 12. In this way, a further axially acting fixing is provided for the third projection 20. It is thus possible to reliably prevent the third projection 20 from losing the radial form fit with the pin eyelet 24. The above description of the third protrusion 20 applies analogously to the fourth protrusion 22.In the example according to FIG. 1, the first is embodied integrally with the third projection and the second is embodied integrally with the fourth projection, such that the first to fourth projections are arranged in alignment with one another. In this way, the pivot axis S corresponds exactly to the pin pivot axis of a conventional pin ski boot. Thus, the adapter device 1 can be used for any conventional pin ski boot without further geometric modifications being required on this boot. For example, in a conventional pin ski boot, the distance of the pin pivot axis from the boot tip and from the footbed is already optimized. Thanks to the proposed adapter device, this design can be made usable without additional effort for use in an alternative binding system 100 or an alternative touring ski binding 6 (see FIGS. 3 aand 3 b, 4 and 6-7 b).In order to provide the prestress, the adapter device 1, in particular the bracket 32, can be produced from spring steel. In this way, the adapter device 1 can firstly have sufficient flexibility, such that the adapter device 1 can be placed over the forefoot part 8 until the third and fourth projections 20, 22 snap into the pin eyes 24. On the other hand, the bracket 32 can provide the clamping force described above thanks to the spring steel.FIGS. 2 a- c show further examples of the proposed adapter device 1. The adapter device 1 according to FIG. 2 a has two side parts corresponding to the first and second ends 10, 12 and a middle part connecting the side parts. The adapter device 1 has a U-shaped bracket 32 which, in contrast to FIG. 1, has no curvature or no inner radii in the transition regions between the side parts and the central part. In this way, the adapter device 1 can also be used for very differently shaped forefoot parts 8. The forefoot part 8 according to FIG. 2 also has no recesses 24 or pin eyes 24. Accordingly, the adapter device 1 is fastened to the forefoot part 8 by means of three screws 36, analogous to FIG. 1. The laterally attached screws 36 may help compensate for a lack of stiffness of the bracket 32 made of spring steel.The fastening device 14 according to FIG. 2 bdoes not have any bores 34 or screws 36, but is provided by the prestress of the bracket 32 in combination with the third / fourth projection 20 / 24. Accordingly, the prestress of the bracket 32 is sufficiently great so that the adapter device 1 is already fastened to the forefoot part 8 by the form fit between the third / fourth projection 20 / 22 and the pin eyes 24. Optionally, the fastener 14 may further comprise an adhesive 14a for adhering a striker center portion to the front side of the forefoot portion. The adhesive 14 acan be a pressure-sensitive adhesive 14 a, which can be released on the inner side of the ironing, in the form of an adhesive tape or even a structural adhesive.The ski boot 2 according to FIG. 2 c comprises no pin eyes 24, so that an adapter device 1 without third and fourth projections 20, 22 is selected. Instead, the fastening device 14 according to FIG. 2 ccomprises a clamping element 14 b, for example in the form of a tension spring 14 bor a clamping belt 14. Screws 36 provide additional safety for fixing the adapter device 1.In the example according to FIG. 2 c, the first / second protrusion 16 / 18 has an engagement portion 26 in which the diameter of the first / second protrusion varies along the longitudinal axis L 1 / L 2. More specifically, the axis provided by the first / second protrusion 16 / 18 in the engagement portion 26 has the shape of a double cone 30 d(see also FIG. 5 b ). In this way, the engagement between the adapter device 1 and a front jaw device 4 of a touring ski binding 6 can be provided in a particularly positionally accurate and robust manner.FIG. 3 ashows schematically and in a detail a side view of a binding system 100 in a departure mode and FIG. 3 bcorrespondingly in an ascent mode. The binding system 100 comprises a touring ski binding 6 and an adapter device 1. the touring ski binding 6 comprises a front jaw device 4 which is configured to pivotably lock the adapter device 1. The front jaw device 4 comprises a holding device 28, a holding plate 28 afixed to a ski by means of holding screws 28 b, and a locking device having a hook-shaped pivot arm 29 c. The retainer 28 has round-shaped first and second recesses 28f, 28g for receiving and retaining the first / second protrusions 16 / 18, respectively. For the sake of illustration, only the second protrusion 18 is illustrated in FIGS. 3 aand 3 b.In the departure mode (FIG. 3 a), the locking device 29 is not in engagement with the adapter device 1, so that the front jaw device 4 is open. In other words, the locking device 29 is in the release state. Thus, in the departure mode, the adapter device 1 is held only by the holding device 28, but with a corresponding force effect, the second protrusion 18 can emerge from the holding device 28 in the negative X direction. The force can be applied, for example, due to a fall in the departure mode and corresponding triggering of the touring ski binding 6 (see FIG. 7 b ).In the ascent mode (FIG. 3 b), the locking device 29 is in engagement with the adapter device 1, so that the front jaw device 4 is closed. In other words, the locking device 29 is in the locking state. Thus, the adapter device 1 and consequently the ski boot 2 fastened thereto can pivot about the pivot axis S provided by the adapter device 1 and locked by the locking device 29, so that the user can execute a walking movement.FIGS. 3 cand 3 d show a further exemplary embodiment of the front jaw device 4. Otherwise, the components and functions of FIGS. 3 cand 3 dcorrespond to those of FIGS. 3 aand 3 b. Correspondingly, the touring ski binding 6 of FIGS. 3 cand 3 dcomprises the front jaw device 4 with the holding device 28 and the locking device 29. The holding device 28 comprises a first end section 28 d, a second end section 28 eand a middle section 28 cconnecting the first and second end sections. The central portion 28c is fixed to the ski 3, for example by means of a retaining plate 28a. The first and second end sections 28 d, eare arranged substantially stationary and substantially perpendicular to the central section 28 cand substantially parallel to one another. The first end section 28 dcomprises a first recess 28 fand the second end section 28 ecomprises a second recess 28 g, wherein the first and second recesses 28 f, 28 gare configured for receiving a shaft, in particular in the form of the first and second projections 16, 18.The locking device 29 has two pivot arms 29 c, each of which has a hook-shaped recess 29 dand which are pivotably fastened to the first and second end sections 28 d,ebetween the locking state and the release state. The corresponding pivot axis is provided by means of the pivot bolt 29 a, which pivotably fixes the locking device 29 to the holding device 28. In the locked state, the pivot arms 29 care pivoted in such a way that the hook-shaped recesses 29 dare aligned with the first and second recesses 28 f, 28 gof the holding device 28, so that the front jaw device 4 provides a pivot bearing for pivotably mounting a shaft, in particular in the form of the first and second projections 16, 18, about the pivot axis S. In FIGS. 3 a- d, the pivot axis S extends parallel to the Y axis and passes centrally through the second protrusion 18. In the example according to FIGS. 3 cand 3 d, the first / second end section 28 d / e each have an insertion bevel for inserting the first / second protrusion 16 / 18, and a retaining lug projecting into the first / second recess 28 f / g.FIG. 4 schematically shows a front view of a rear side of the front jaw device 4 of the touring ski binding 6 of the binding system 100, wherein the front jaw device 4 pivotably supports the adapter device 1. The locking device 29 is in an engagement position so that the front jaw device 4 is closed and the touring ski binding 6 is in the upward mode. In other words, the locking device 29 is in a locking state. The first / second projection 16 / 18 is pivotably held by means of a positive fit in the holding device 28 and the locking device 29.The first / second projection 16 / 18 each has an engagement section 26 with a double cone shape 30 d, so that the slopes of the cone shape contribute to the engagement section 26 remaining in the holding device 28 and the locking device 29 even in the case of mechanical play.In the locked state, the front jaw device 4 provides both a radial bearing and an axial bearing for the adapter device 1, each with respect to the pivot axis S. To provide the radial bearing, the holding device 28 has rounded, substantially U-shaped recesses 28 f, 28 g(see FIGS. 3 a- d) at the first and second end portions 28 d, 28 e, the U-shape of which recesses is open in the negative X direction.Furthermore, the locking device 29 has a hook-shaped recess 29 d(see FIGS. 3 a- d ). In the locked state, the recesses 28 f, 28 gof the holding device are aligned with the one hook-shaped recess 29 dof the locking device 29.The first / second end 10 / 12 has a first / second outer side 10 a / 12 a, which are aligned substantially parallel to one another and point away from one another. Furthermore, the first and second outer sides 10 a, 12 ahave a fixed distance from one another, in particular in the form of an outer distance. Because the first and second end sections 28 d, 28 eare likewise at a fixed distance from one another, in particular in the form of an inner distance or clear dimension, the holding device 28 can provide the axial bearing for the adapter device, in particular for the first / second projection 18 / 16. In this case, the first / second outer side 10 a / 12 aeach provide a flange for the first / second projection 16 / 18, such that the adapter device is configured to be mounted in a holding device 28 via positive locking, more precisely to be mounted axially by the holding device 28 via positive locking with locking along the pivot axis S. In this way, the holding device 28 sets an axial bearing for axially supporting the adapter unit 1 along the pivot axis S. The axial bearing is provided in particular in a fixed manner. In other words, the front jaw device does not have an operating state according to the design, in which the axial bearing provided by the holding device 28 changes its position or position with respect to the ski or within the touring ski binding 6. In other words, the axial bearing provided by the holding device 28 is stationary in all operating states of the touring ski binding 6 according to the design.In this way, the axial bearing can be provided exclusively by means of the form-fit locking along the pivot axis S. In other words, the axial bearing of the adapter unit is free of frictional engagement by the holding device 28, in particular free of frictional engagement in all operating states according to the design. In this way, a complex spring mechanism can be dispensed with compared to conventional pin bonds.Furthermore, the first / second outer side 10 a / 12 acan each have an outwardly directed first / second contact surface 10 b / 12 b, which are provided for the form fit locking along the pivot axis S. In other words, in an engagement state, the first / second contact surface 10 b / 12 bmay come into contact with a first / second holding surface 28 h / i(see FIG. 6 b ) of the holding device 28 in order to provide a locking form fit along the pivot axis S.FIG. 5 ashows that the first / second protrusion 16 / 18 may have a circular cross section 30 aor an elliptical cross section 30 b. Additionally or alternatively, the first / second protrusion 16 / 18 may include an engagement portion 26 that may be shaped according to a single shell hyperboloid 30 c, a blunt 30 d, or a pointed 30 d double cone. The variants according to FIG. 5b can be freely combined with the variants according to FIG. 5a. Any of the possible combinations may be used in each embodiment of the adapter device 1.FIG. 6 ashows schematically a partially cut-away top view of a binding system 100. An adapter device 1 is fastened to a ski boot 2 and the adapter device 1 is held by a closed front jaw device 4 of a touring ski binding 6, so that the touring ski binding is in the climbing mode. In other words, the locking device 29 is in the locking state. The locking device 29 is pivotable about the holding device 28 by means of two pivot bolts 29 a. The holding device 28 is fastened to the ski 3 by means of a holding plate 28 aand holding screws 28 b. The adapter device 1 corresponds to the example from FIG. 1. the locking device 29 is of substantially U-shaped construction and comprises two pivot arms 29 cconnected by means of a pivot lever 29 b. Thanks to the pivot lever 29 b, the pivoting of the pivot arms 29 cis synchronized. The proposed U-shaped construction of the locking device 29 in combination with the proposed substantially U-shaped adapter device 1 enables the proposed front jaw device 4 of the touring ski binding 6 to be used for conventional pin-eye ski boots. In this manner, a binding system 100 is provided that is highly compatible with existing shoes and binding systems. As can be seen from FIG. 6 a, the adapter device 1 is held in a positively locking manner by the holding device 28 along the pivot axis S, as will be described in more detail below with reference to FIG. 6 b.FIG. 6 bshows a detail plan view of an exemplary adapter device 1, which is arranged in a touring ski binding 6-analogously to the example shown in FIG. 6 a. For the sake of clarity, only selected components of the corresponding binding system 100 are shown in FIG. 6 b.As can be seen from FIG. 6 b, the first end section 28 dhas a first holding surface 28 h, and the second end section 28 ehas a second holding surface 28 i. The first / second end section 28 d / e extends in each case from the central section 28 cor the retaining plate 28 ato the first / second retaining surface 28 h / iand optionally beyond it. The first and second holding surfaces 28 h, 28 iare arranged opposite each other, so that by means of the first and second holding surfaces 28 h, 28 i, an axial bearing for a shaft in the form of the first and second projections 16, 18 which are arranged in alignment with each other is provided. The shaft 16, 18 is axially mounted in the direction of the pivot axis S, i.e. locked against axial displacement and / or corresponding pivoting, since the first / second outer side 10 a / 12 aof the adapter device 1 contacts the first / second holding surface 28 h / i of the holding device 28. In other words, the first / second outer side 10 a / 12 aand the first / second holding surface 28 h / i abut against one another, wherein an axial play is permitted in the direction of the pivot axis S. This is because the contacting or contacting against one another does not serve to provide a frictional connection between the corresponding surfaces, but the frictional connection does not damage, but serves to provide the axially blocking positive connection in the direction of the pivot axis S.In a further development not shown in the figures, the first / second outer side 10 a / 12 bmay have an elevation concentric to the pivot axis S, which elevation extends from the first / second outer side 10 a / 12 ain the lateral / medial direction L / M, i.e. in each case extends parallel to the first / second projection 16 / 18. Accordingly, the first / second end section 28 h / imay have a depression geometrically corresponding to the elevation, so that the elevation can engage in the depression in a substantially shape-filling manner. In this case, both an axial and a radial bearing are present between the elevation and the depression. In this way, the bearing of the first / second protrusion 16 / 18 is further improved. In this case, the circular inner surface of the respective recess provides the first / second retaining surface 28 h / i and the circular outer surface of the first / second outer side 10 a / 12 aprovidely provides the first / second contact surface 10 b / 10 b.FIGS. 7 aand 7 b show a side view of an overview of the binding system 100. The binding system 100 comprises the touring ski binding 6 and the adapter device 1 described above. The adapter device 1 is fastened to the forefoot part 8 of a ski boot 2 by engaging the third / fourth protrusion 20 / 22 (not shown here) with the pin eyes 24 of the forefoot part 8. The bracket 32 of the adapter device, which bracket is made of spring steel, provides a clamping force thanks to the prestress, which fixes the adapter device to the ski boot 2 in combination with the engagement position of the third / fourth projection 20 / 22 with the pin eyes 24.The touring ski binding 6 comprises the above-described front jaw device 4 and a rear jaw device 40, having a lever mechanism 42. The lever mechanism 42 comprises a base 46, to which a lever 48 is rotatably fastened, i.e. can be pivoted about the base 46. Rotatably mounted on the lever 48 is a clamping bracket 50, which has a clamping nose 52 at one end and a clamping hook 54 at the other end.If the heel part 44 of the ski boot 2 is to be fixed with the rear jaw device 40, as shown in FIG. 7 b, the lever 48 is first pivoted clockwise about the base 46 (in the present illustration). The clamping block 50 is then pivoted about the lever 48. As a result, the clamping nose 52 contacts the heel part 44 of the ski boot 2.By further pivoting of the clamp bracket 50, a force is exerted on the heel part 44 of the ski boot 2. As soon as the clamping block 50 has been pivoted by a certain angular amount, the clamping hook 54 can be guided over the lever 48 and fixed there or hooked in. As a result, a force acts permanently on the heel part 44 by the clamping nose 52, as a result of which the ski boot 2 is fixed.The acting force typically comprises two components, namely a force Fx in the direction of the shoe longitudinal axis X, and a force Fz acting against the shoe vertical axis Z, as shown in FIG. 7 b. The force Fx presses the ski boot 2, or the first and second projections 16 / 18 of the adapter device 1 fastened to the ski boot 2, into the holding device 28, so that the ski boot 2 is fixed in the direction of the longitudinal axis X of the boot. The force Fz pushes the ski boot 2 or the heel part 44 in the direction of the ski 3, so that the heel part 44 cannot be lifted off the ski 3.FIG. 7 b shows the touring ski binding 6 in the departure mode. The rear jaw device 40 has a safety release 56. As a result, the lever mechanism 42 can open, for example, in the event of a predefined force effect, such that the heel part 44 of the ski boot can be removed from the rear jaw device 40. With the triggering of the safety triggering 56, the pressing of the ski boot against the front jaw device 4 is thus also dispensed with, so that the adapter unit 1 can be released from the engagement position with the holding device 28 and the ski boot is no longer held on the ski by the touring ski binding 6.Thus, the proposed front jaw device 4 completely manages without a spring mechanism of its own and a force-fit-based holding of the adapter device 1 of its own. The front jaw device 4 can thus be provided with particularly low outlay and with reduced weight. The proposed touring ski binding 6 can be provided, for example, by combining the front jaw device 4 described above with a rear jaw device according to the disclosure of the publication DE 10 2021 134 650 A1. The above-described rear jaw device 40 can be implemented, for example, in accordance with the rear jaw device 3 of DE 10 2021 134 650 A1.Where applicable, all individual features illustrated in the exemplary embodiments can be combined with one another and / or interchanged without departing from the scope of the invention. For example, the front jaw device of Figures 3c and 3d may be used in the binding system of Figures 7a and 7b.List of reference characters1 Adapter device 2 Ski boot 3 Ski 4 Front jaw device 6 Touring ski binding 8 Forefoot part 10 First end 10 aFirst outer side 10 bFirst contact surface 11 Lateral side of the ski boot 12 Second end 12 aSecond outer side 12 bSecond contact surface 13 Medial side of the ski boot 14 Fastening device 14 aAdhesive 14 b Spannelement element 16 First protrusion 18 Second protrusion 20 Third protrusion 22 Fourth protrusion 24 Recesses, Pin eyes 26 Engagement portion 28 Holding device 28 a Halteplatte plate 28 b Halte screws 28 c Mittelabschnitt portion 28 d / eFirst / Second End portion 28 f / gFirst / Second Recess 28 h / iFirst / Second Holding Surface 29 Locking device 29 a Schwenk bolt 29 b Schwenkhebel lever 29 c Schwenkarm arm 29 d Haken-shaped recess 30 a- d Achsen shape in the engagement portion 32 Bracket 34 Bore 36 Fastening bolt 37 Washers 40 Rear jaw device 42 Lever mechanism 44 Heel part 46 Base 48 Lever 50 Clamping bracket 52 Clamping nose 54 Clamping hook 56 Safety release 100 Binding system L 1, L 2 Longitudinal axes of the first / second projection L Lateral direction M Medial direction S Pivot axis X Shoe longitudinal axis Y Shoe transverse axis Z Shoe vertical axisReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedDE 10 2021 134 650 A1 [0005, 0086]

Claims

Adapter device (1) for fastening a ski boot (2) to a front jaw device (4) of a touring ski binding (6), wherein the adapter device (1) is fastenable to a forefoot part (8) of the ski boot (2), wherein the adapter device (1) has a first end (10) and a second end (12), wherein the first end (10) is fastenable to the lateral side (11) of the ski boot and the second end (12) is fastenable to the medial side (13) of the ski boot (2), wherein a fastening device (14) for fastening the adapter device (1) to the ski boot (2) is provided on the adapter device (1), wherein the adapter device (1) has a first protrusion (16) at the first end (10) and a second protrusion (18) at the second end (12), wherein, when the adapter device (1) is in a state fastened to the ski boot (2), the first protrusion (16) extends in the lateral direction (L) and the second protrusion extends in the medial direction (M), wherein the longitudinal axes (L 1, L 2) of the first protrusion (16) and the second protrusion (18) are arranged in alignment with one another in order to provide a pivot axis (S) for pivoting the ski boot (2) about the touring ski binding (6).Adapter device (1) according to claim 1, wherein the first protrusion (16) and / or the second protrusion (18) are bolt-shaped or web-shaped.Adapter device (1) according to claim 1 or 2, wherein the fastening device (14) has a third protrusion (20) at the first end (10) and a fourth protrusion (22) at the second end (12), wherein, when the adapter device (1) is in the state fastened to the ski boot (2), the third protrusion (20) extends in the medial direction (M) and the fourth protrusion (22) extends in the lateral direction (L).Adapter device (1) according to claim 3, wherein the third protrusion (20) and / or the fourth protrusion (22) are configured to be in engagement with a respective recess (24) of the forefoot part (8), in particular to be in engagement in a positive-locking manner, in the state fastened to the ski boot (2).Adapter device (1) according to one of the preceding claims, wherein the first projection (16) and the second projection (18) are fixed to the forefoot part (8) in a fixed position in the state fastened to the ski boot (2).Adapter device (10) according to one of the preceding claims, wherein the first protrusion (16) and / or the second protrusion (18) are configured to be positively engaged, in particular substantially positively engaged, with the front jaw device (4) of the touring ski binding.Adapter device (1) according to claim 6, wherein the first protrusion (16) and / or the second protrusion (18) comprise an engagement portion (26) configured to be engaged with a retaining device (28) and / or locking device (29) of the front jaw device (4), wherein the first protrusion (16) and / or the second protrusion (18) in the engagement portion (26) have a circular, elliptical or polygonal cross section.Adapter device (1) according to one of the preceding claims, wherein the first end (10) has a first outer side (10a) which points in the lateral direction (L) and the second end (12) has a second outer side (12a) which points in the medial direction (M), wherein the first and second outer sides (10a, 12a) are configured to be positively engaged, preferably substantially positively engaged, with a retaining device (28) of the front jaw device (4), in particular in the form of a preferably substantially positively locking connection along the pivot axis (S).Adapter device (1) according to claim 8, - wherein the first and second outer sides (10a, 12a) are arranged substantially perpendicular to the pivot axis (S) and / or - wherein the first outer side (10a) provides a first contact surface (10b) and the second outer side (12a) provides a second contact surface (12b), wherein the first and second contact surfaces (10b, 12b) are arranged substantially perpendicular to the pivot axis (S).Adapter device (1) according to one of the preceding claims 3 to 9, wherein the third protrusion (16) and the fourth protrusion (18) are arranged in alignment with the pivot axis (S).The adapter device (1) according to any one of the preceding claims, wherein the fastening device (14) comprises a bracket (32) extending from the first end (10) to the second end (12).Adapter device (1) according to one of the preceding claims, wherein the fastening device (14), in the state fastened to the ski boot, has a substantially U-shape in a cross section along a transverse plane, wherein the transverse plane is parallel to a plane spanned by the shoe longitudinal axis (X) and the shoe transverse axis (Y).Adapter device (1) according to one of the preceding claims, - wherein the fastening device (14) has a bore for fastening the adapter device (10) to the ski boot by means of a fastening bolt (36), in particular a screw (36) or rivet, and / or - wherein the fastening device (14) has a suspension line which can be fastened to the ski boot (2).Touring ski binding (6) comprising a front jaw device (4) having a holding device (28) and a locking device (29), wherein the holding device (28) has a first end section (28d), a second end section (28e) and a middle section (28c) connecting the first and second end sections (28d, 28e), wherein the middle section (28c) can be fastened to a ski (3) and the first and second end sections (28d, 28e) are arranged substantially stationary and substantially perpendicular to the middle section (28c) and substantially parallel to one another, wherein the first end section (28d) has a first recess (28f) and the second end section (28e) has a second recess (28g), wherein the first and second recesses (28f, 28g) are configured to receive a shaft (16, 18), wherein the locking device (29) has two pivot arms (29c), each having a hook-shaped recess (29d) and which are pivotably fastened to the first and second end sections between a locking state and a release state, wherein, in the locking state, the pivot arms (29c) are pivoted such that the hook-shaped recesses (29d) are aligned with the first and second recesses (28f, 28g) of the holding device (28), such that the front jaw device (4) provides a pivot bearing for pivotably mounting the shaft (16, 18) about a pivot axis (S).Touring ski binding (6) according to claim 14, wherein the first and second end portions (28d, 28e) are configured to be positively engaged, substantially positively engaged, with a first and second outer side (10a, 12a) of an adapter device (1) which can be fastened to a ski boot (2), or with a lateral side (11) and a medial side (13) of a ski boot (2), in particular in the form of a positively locking along the pivot axis (S).Touring ski binding (6) according to claim 14 or 15, wherein the first end section (28d) has a first holding surface (28h) and the second end section (28e) has a second holding surface (28i), wherein the first and second holding surfaces (28h, 28i) are arranged opposite one another such that an axial bearing for the shaft (16, 18) is provided by means of the first and second holding surfaces (28h, 28i).Binding system (100) comprising a touring ski binding (6) according to one of claims 14-16 and an adapter device (1) according to one of claims 1-13.Binding system (100) according to claim 17, wherein an inner distance between the first and second holding surfaces substantially corresponds to an outer distance between the first and second outer sides (10a, 12a) of the adapter device (1), in particular wherein the inner distance is substantially the same as the distance between the first and second contact surfaces (10b, 12b).Binding system (100) according to claim 17 or 18, wherein in an operating state in which the adapter device (1) is fastened to the ski boot (2) and the adapter device (1) is in engagement with the front jaw device (4) of the touring ski binding (6), the adapter device (1) is axially supported parallel to the pivot axis (S) by means of the holding device (28) in order to block a movement of the adapter device (1) along the pivot axis (S).Binding system (100) according to one of claims 17-19, wherein the holding device (28) provides a stationary axial bearing for axially supporting the adapter unit (1) along the pivot axis (S).

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