EP4537912A1 - Agencement de ski de fond - Google Patents

Agencement de ski de fond Download PDF

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Publication number
EP4537912A1
EP4537912A1 EP23203399.3A EP23203399A EP4537912A1 EP 4537912 A1 EP4537912 A1 EP 4537912A1 EP 23203399 A EP23203399 A EP 23203399A EP 4537912 A1 EP4537912 A1 EP 4537912A1
Authority
EP
European Patent Office
Prior art keywords
ski
chassis section
cross country
contact
contact surfaces
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23203399.3A
Other languages
German (de)
English (en)
Inventor
Per MÅRS
Johan Lepik
Petter Erlandsson
Christian Öhrman
Fredrik Andersson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Flow Motion Technology AB
Original Assignee
Flow Motion Technology AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Flow Motion Technology AB filed Critical Flow Motion Technology AB
Priority to EP23203399.3A priority Critical patent/EP4537912A1/fr
Publication of EP4537912A1 publication Critical patent/EP4537912A1/fr
Pending legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C5/00—Skis or snowboards
    • A63C5/12—Making thereof; Selection of particular materials
    • A63C5/128—A part for the binding being integrated within the board structure, e.g. plate, rail, insert
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C9/00—Ski bindings
    • A63C9/003—Non-swivel sole plate fixed on the ski
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C9/00—Ski bindings
    • A63C9/005—Ski bindings with means for adjusting the position of a shoe holder or of the complete binding relative to the ski

Definitions

  • the present disclosure relates to the field cross country skiing, sometimes referred to as Nordic skiing.
  • the disclosure relates to a cross country ski arrangement comprising a ski and a binding apparatus.
  • the disclosure also relates to a binding apparatus for such a cross country ski arrangement.
  • the cross country ski arrangement and the binding apparatus may be utilized at all kinds of cross country skies including skis designed and intended for both classical cross country skiing and cross country skating.
  • the rod is pivotally held by the binding such that the entire boot may be pivoted about a transverse pivotal axis defined by the rod.
  • One object of the present disclosure is to provide an enhanced cross country ski arrangement comprising a cross country ski and a binding apparatus.
  • Another object is to provide such an arrangement which allows for that the angle of the skier's foot in a vertical plane through the longitudinal direction of the ski may be varied within a comparatively great interval.
  • a further object is to provide such an arrangement which allows prolonged leg strokes at various skiing techniques.
  • Another object is to provide such an arrangement which is simple in construction, and which may be manufactured at a comparatively low cost.
  • the cross country ski arrangement comprises a cross country ski, which comprises a ski body delimited by a lower ski surface arranged to glide on snow and an upper ski surface arranged opposite to the lower surface, which ski body exhibits a longitudinal direction extending from a tail to a ski tip, and a binding apparatus.
  • the binding apparatus comprises an upper chassis section comprising a first contact surface having a front end and a rear end, a lower chassis section comprising a second contact surface having a front end and a rear end.
  • At least one of the first and second contact surfaces exhibits a curved portion, thereby allowing the upper chassis section to pivot relative to the lower chassis section by rolling contact motion between the first and second contact surface, such that a momentary contact region of the first and second contact surfaces moves back and forth in the longitudinal direction between the front and rear ends of the first and second contact surfaces.
  • a spring back means is arranged to urge the momentary contact region to a neutral position between the front and rear ends of the first and second contact surfaces.
  • At least a portion of the upper and the lower chassis sections are recessed into the ski body from the upper ski surface such that the first and second contact surfaces are arranged below the upper ski surface.
  • the skier may extend the forward movement of the gliding ski at the same time as he or she maintains pressure on the kick-off ski for a prolonged time.
  • the skier may kneel deeper when initiating the pole push-off and also more easily raise the body at the end of the push-off phase of each stroke.
  • the increased foot angle interval both facilitates the skier's displacement of the centre of gravity in the longitudinal direction and extends the longitudinal distance along which the centre of gravity may be shifted. Both these effects increase the skier's ability to minimize contact between the grip vax zone of the ski and the snow.
  • the increased foot angle interval allows for a prolongation of each leg stroke.
  • the recessed arrangement of the binding apparatus into the ski also provides for a number of advantages. Such an arrangement contributes to maintain the centre of gravity, both of the binding apparatus and the skier, as low as possible. This in turn enhances the skier's ability to keep in balance.
  • the recessed arrangement also prevents snow and other foreign matter to interfere with the contact surfaces and the functioning of the binding apparatus.
  • the recessed arrangement of the upper pivotal chassis section allows for that this section may readily be arranged securely guided in the lateral direction to thereby prevent any wiggling of the upper chassis section and the foot about a longitudinal axis.
  • a further advantage obtained by the recessed arrangement of the contact surfaces is that the vertical height of that portion of the upper chassis section which is recessed into the ski may be comparatively great. This is important since the material forming the upper chassis section's lower portion contributes to provide stiffness and rigidity to the upper portion of the upper chassis section. This upper portion receives the downwardly directed force exerted by the skier, especially at push-off. For gaining maximal push-off efficiency it is important that an as great portion as possible of the force generated by the skier is transmitted to the contact region between the lower ski surface and the snow. That is, it is important that an as small portion as possible of the generated force is absorbed by causing deformation of the various components arranged between the foot of the skier and the snow.
  • the recessed arrangement of portions of the upper chassis section greatly contributes to achieving this goal since any increase in the vertical height of the lower portion of the upper chassis section increases the rigidity of the upper chassis section's upper portion as well as of any plate member of a traditional binding mounted thereon. Hence, the recessed arrangement contributes to increase the rigidity of the entire cross country ski arrangement thereby reducing loss of energy due to deformation of constituent components, especially at push-off.
  • the upper chassis section may comprise an elongate structure arranged to be received in the lower chassis section and comprising a lower edge exhibiting the first contact surface.
  • the spring back means may comprise at least one elongate spring element such as leaf spring or a resilient rod.
  • the at least one curved contact surface is arranged on an exchangeable insert.
  • the exchangeable insert may be arranged as a removable portion of the elongate fin-like structure of the upper chassis section.
  • the spring back means may be adjustable for controlling the force by which the momentary contact region (CR) is urged towards the neutral position.
  • At least a portion of the curved portion of a contact surface may have a radius of curvature of more than 1 m, preferably approx. 2-8 m and more preferably approx. 4-6 m.
  • At least a portion of the first and/or second contact surface may exhibit a curvature and length which are arranged such that the maximum rolling pivot angle is between 1-10 °, preferably between 2-5 ° and most preferably approx. 3°, when the contact region moves between the front and rear ends of the first and second contact surfaces.
  • the cross country ski arrangement may further comprise a cross country ski binding attached to the upper chassis section and being arranged to allow a ski boot to be pivotally fixed to the upper chassis section.
  • a cross country ski binding apparatus as set out in independent claim 13.
  • the cross country ski apparatus is intended for use at a cross country ski arrangement as set out above.
  • the cross country ski apparatus comprises an upper chassis section comprising a first contact surface having a front end and a rear end, and a lower chassis section comprising a second contact surface having a front end and a rear end. At least one of the first and second contact surfaces exhibits a curved portion, thereby allowing the upper chassis section to pivot relative to the lower chassis section by rolling contact motion between the first and second contact surface, such that a momentary contact region of the first and second contact surfaces moves back and forth in the longitudinal direction between the front and rear ends of the first and second contact surfaces.
  • a spring back means is arranged to urge the momentary contact region to a neutral position between the front and rear ends of the first and second contact surfaces. At least a portion of the upper and lower chassis sections are arranged to be recessed into a ski body of a cross country ski, from an upper ski surface such that the first and second contact surfaces are arranged below the upper ski surface.
  • the conventional binding 20 comprises a plate member 21 which is fixed onto the binding apparatus 30 and a connection device 22 which, as known in the art, allows the toe portion of the ski boot 1 to be removably fixed to the ski 10 while allowing the ski boot 1 to be pivoted in a vertical and longitudinal plane about a pivotal axis PA which is defined by a transverse rod (not shown) which is recessed from below in the front portion of the sole 2 of the boot 1.
  • Fig. 2a schematically illustrates that the pivotal conventional foot angle interval CFA allowed by the conventional binding 20 may typically be about 0-70 °.
  • the fin-shaped portion 42 has a constant width in the lateral direction which is essentially smaller than the width of the plate shaped portion 41.
  • the fin-shaped portion 42 further extends centrally, in the longitudinal direction and is arranged orthogonal to the plate shaped portion 41.
  • the upper portion of the fin-shaped portion 42 is somewhat shorter in the longitudinal direction than its lower portion such that the fin-shaped portion together with the plate shaped portion 41 forms a forwardly and a rearwardly open recess. Further, the lower edge of the fin-shaped portion 42 exhibits a first contact surface 43.
  • the lower chassis section 50 comprises an elongate member 51 which, int shown example forms a box-like member.
  • the box-like member 51 is recessed into an elongate grove 16 which is formed centrally from the upper surface 12 in a mid-portion of the ski's 10 body 11.
  • the box-like member 51 comprises a bottom wall 52 which, at its upper surface exhibits a second contact surface 53.
  • the box-like member 51 further comprises two mutually opposed and parallel side walls (not shown) which extends upwardly from respective side edges of the bottom wall 52. By this means the recessed box-like member 51 exhibits a constant U-shaped cross-section.
  • the box-like member 51 also comprises a rear wall 54 and a front wall 55.
  • the box-like member 51 exhibits a circumferential flange 56 which extends outwardly from the side walls, and the rear 54 and front 55 wall such that it bears against the upper surface 12 of the ski 10 around the recess 16 of the ski 10.
  • a rear stop flange 57 protrudes forwardly from the upper edge of the rear wall 54 and a front stop flange protrudes rearwardly from the front wall 55.
  • the rear stop flange 57 is formed integral with the rear wall 54 whereas the front stop flange 58 is removably fixed to the front wall 55 by means of a fixation screw 59 for allowing insertion and removal of the upper chassis section's 40 fin-shaped portion 41 into the box-like member 51.
  • the binding apparatus further comprises a spring back means 60 which, in the example shown in figs. 1 and 2a-b , comprises an elongate leaf spring 61 exhibiting a front end portion 61 and a rear end portion 63.
  • the front end portion is fixed to the upper surface 12 of the ski 10 by means of a bracket 64 which may be securely fixed to the upper surface 12 of the ski 10 by an adhesive. Alternatively it may be sufficient that the bracket is pressed onto the upper surface 12 of the ski by means of a clamping means 65 described below.
  • the rear end portion 63 of the leaf spring 61 bears against the upper surface of the plate member 21 of the conventional binding 20.
  • the rear end portion 63 is urged downwardly towards the plate member 21 by means of a clamping means 65 which holds a mid-portion of the leaf spring 61 at a fixed distance from the upper surface 12 of the ski 10.
  • the clamping means 65 comprises a screw 66 which extends through holes in the leaf spring 61 and through a lower 67 and an upper 68 bushing and which is threadedly engaged with the body 11 of the ski 10.
  • the upper chassis section 40 is formed as a single integral part for example by injection moulding of a polymer material.
  • the lower chassis section 50 comprises an integral part comprising the bottom wall 52, the side walls, the rear 54 and front 55 walls and the circumferential flange 56 which may be formed by injection moulding of a polymer material.
  • the lower chassis section further comprises the front stop flange 58 formed as a separate part, e.g. by injection moulding and the fixation screw 59.
  • other materials may be used for forming the upper and lower chassis sections. Examples of such other materials are steel, aluminium and other metals as well as carbon fibre based materials and polymer materials formed by additive manufacturing such as 3D printing.
  • the upper portion of the upper chassis section may be formed by a first material and the lower fin-shaped portion by another material.
  • at least the fin shaped portion and possibly the entire upper chassis section is formed of or comprises a material exhibiting a high elasticity modulus such as e.g. carbon fibre containing materials.
  • the lateral width and the longitudinal length of the recess 16 in the ski essentially corresponds to the outer dimensions of the box like member 51 such that the box like member is received in the recess 16 with a tight fit.
  • the box-like member is additionally fixed in the recess 16 by means of an adhesive.
  • the inner width between the side walls of the box like member 51 is essentially equal to the lateral width of the fin-shaped portion 42.
  • the fin-shaped portion 51 is received in the box like member 51 with a close running fit or a sliding fit such that the upper chassis section 40 is allowed to roll relative to the lower chassis section 50 while still being supported in the transverse direction for preventing sideways movement and wiggling of the upper chassis section.
  • the materials forming the fin-shaped portion 42 and the box like member 51 are selected to present comparatively high strength and rigidity and low mutual friction.
  • the first contact surface 43 arranged at the upper chassis section 40 exhibits a rear curved portion 43a and a front planar portion 43b.
  • the second contact surface 53 arranged at the bottom wall 52 is planar over its entire length.
  • the curvature of the curved portion 43 is constant with a radius of curvature of approx. 5 m and the curved portion 43a extends forwardly from the rear end of the first contact surface 43 approx. 3/7 of the total length of the first 43 and second 53 contact surfaces.
  • the properties of the contact surfaces 43, 53 may however be varied depending on various conditions such as the skiing technique for which the ski is to be optimized, the weather and snow conditions and not the least to personal preferences of the skier.
  • the arrangement of the two contact surfaces 43, 53 where at least one exhibits a curved portion 43a allows the upper chassis section 40 and thereby the ski boot 1 to pivot relative to the lower chassis section 50 and the ski 1 by rolling contact motion between the first 43 and second 53 contact surface.
  • the first 43 and second 53 contact surfaces will, at each instance of the relative movement, be in mutual contact along a momentary contact region CR which moves longitudinally back and forth along the two contact surfaces 43, 53.
  • the binding apparatus has assumed its frontmost rolling position.
  • the momentary contact region CR extends along the planar portion 43b of the first contact surface and a corresponding front portion of the planar second contact surface 53.
  • This frontmost rolling position where the momentary contact region is positioned at its front most position, constitutes the neutral position since the spring back means 60 with the leaf spring 61 acts downwardly on the front portion of the upper chassis section, thereby urging it to roll forwardly, i.e. clockwise as shown in the figures.
  • the spring back means 60 returns and maintains the upper chassis section 40 at a pivotal position where the momentary contact region CR is in its frontmost neutral position. At this position the skier's foot assumes the foot pitch angle as defined herein.
  • Fig. 2b illustrates how the upper chassis section 40 and the boot 1 has been rolled backwards, against the resilient force exerted by the spring back means 60.
  • the momentary contact region has been displaced rearwards to the rear ends of the first 43 and second 53 contact surfaces.
  • the lower surface of a rear portion of the upper plate shaped portion 41 of the upper chassis section 40 has now come into abutment with an upper surface of the rear stop flange 57 of the lower chassis section, such that any further backward rolling is prevented.
  • the upper chassis section 140 differs from the embodiment shown in figs. 1 and 2a-b in that a plate member of a conventional ski binding is formed integral with the upper chassis section 140 and forms a plate shaped portion 141 thereof. Hence at this embodiment it is not necessary to fix a separate plate member of a conventional binding to the upper chassis section 140.
  • An elongate fin-like structure 142a, 142b extends downwardly from the plate shaped upper portion 141.
  • the fin like structure comprises an upper fin portion 142a formed integral with the plate shaped portion 141 and a separate exchangeable insert 142b.
  • the insert 142b may be attached to and removed from the lower section of the upper fin portion 142a by means of co-operating form locking means arranged at the front and rear ends of the fin portion 142a and the insert 142b.
  • the transverse width of the insert 142 is equal to the width of the upper fin portion 142a.
  • the lower edge of the insert 142b exhibits a first contact surface 143 at least a portion of which is curved.
  • Different inserts 142b where the first contact surface 143 exhibits varying curvatures and extensions of the curved portion may be provided.
  • the characteristics of the binding apparatus 130 such as the maximum rolling pivotal angle and the foot pitch angle, may readily be adapted depending on the conditions at hand and the skier's preferences, simply by selecting a suitable insert.
  • the binding apparatus 130 further comprises a lower chassis section 150 which greatly resembles the lower chassis section 50 shown in figs. 1 and 2a-b and described above.
  • the lower chassis section comprises a box like member 151 having a bottom wall which exhibits a planar upper surface which forms a second contact surface 153.
  • Two mutually opposed and parallel side walls 151a, 151b extend upwardly from respective side edges of the bottom wall.
  • the interior distance between the side walls 151a, 151b is essentially equal to the width of the fin shaped portion 142a and the insert 142b such that the fin-like structure 142a, 142b is transversely supported by the side walls 151a, 151b when received in the box like member 151.
  • the spring back means 160 comprises two resilient rods 161a, 161b which extend in a V-shaped formation from between respective front and rear portions.
  • the rods 161a, 161b may preferably be formed of or comprise a carbon fibre material.
  • the rods 161a 161b are supported by an elongate bracket 168 which may be formed of an injection moulded polymer material.
  • the rods 161a, 161b and the bracket 168 are fixed to the ski 110 by means of a clamping means 165 which comprises a screw 166a extending between the rods and through the bracket 168 and which is threadedly received in a screw bussing 166b securely fixed in a corresponding hole in the ski 110.
  • the clamping means 165 further comprises a lower 167 and an upper 168 bushing which receives the screw 166 and which exerts a downwardly directed clamping force onto the rods 161a, 161b.
  • the rods 161a, 161b and the bracket are fixed to the ski 110 and the rods are pretensioned downwardly such that the front end of the rods and the bracket is pressed against the upper surface 0112 of the ski 110 and the rear end of the rods 161a, 161b and the bracket is pressed downwardly against a front portion of the upper chassis section's 140 plate shaped portion 141.
  • This results in, just as in the embodiment shown in figs. 1 and 2a-b , that the upper chassis section 140 is urged toward a neutral position where the momentary contact portion (not shown in fig. 3 ) is positioned at the front end portion of the first 143 and second 153 contact surfaces.

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  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
EP23203399.3A 2023-10-13 2023-10-13 Agencement de ski de fond Pending EP4537912A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP23203399.3A EP4537912A1 (fr) 2023-10-13 2023-10-13 Agencement de ski de fond

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP23203399.3A EP4537912A1 (fr) 2023-10-13 2023-10-13 Agencement de ski de fond

Publications (1)

Publication Number Publication Date
EP4537912A1 true EP4537912A1 (fr) 2025-04-16

Family

ID=88413137

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23203399.3A Pending EP4537912A1 (fr) 2023-10-13 2023-10-13 Agencement de ski de fond

Country Status (1)

Country Link
EP (1) EP4537912A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988004563A1 (fr) * 1986-12-19 1988-06-30 Witco A/S Fixation de ski reglable en longueur
US20140015227A1 (en) * 2011-03-18 2014-01-16 Marsblade Ab Binding
US20140062041A1 (en) * 2012-08-31 2014-03-06 Marsblade Ab Coupling means
CA3192932A1 (fr) * 2020-10-02 2022-04-07 Fredrik Andersson Patin a glace a lame interchangeable

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988004563A1 (fr) * 1986-12-19 1988-06-30 Witco A/S Fixation de ski reglable en longueur
US20140015227A1 (en) * 2011-03-18 2014-01-16 Marsblade Ab Binding
US20140062041A1 (en) * 2012-08-31 2014-03-06 Marsblade Ab Coupling means
CA3192932A1 (fr) * 2020-10-02 2022-04-07 Fredrik Andersson Patin a glace a lame interchangeable

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