Cross country ski, especially for the practice of alternating steps
AssigneeSalomon S.A.
InventorAlain Bejean
Life of this patent
Estimating the term…
Abstract
A cross country ski in which, in the central portion of the ski, in the gripping zone of the boot, the heel zone acts as a support of the foot during a sliding phase, and a metatarso-phalangian support zone of the impulsion in the impulsion phase of the ski, a transverse slit is arranged, crossing the ski. The slit defines two flexion beams, upper and lower, respectively, in the thickness of the ski. This arrangement enables, during the impulsion phase, a good flattening on the ground of the lower beam and thus of the sole portion of the ski, i.e., the waxing chamber. The efficiency of the impulsion is thus substantially increased without affecting the sliding phase.
Claims31
A cross-country ski for practicing alternating steps, including an impulse phase and a sliding phase, said cross-country ski comprising:
- an integral body having a central portion, said central portion having an upward chamber at least in a rest position of the ski and being adapted to support a ski boot at a boot support zone, the boot support zone having a heel zone for application of pressure by the foot of a skier during the sliding phase and a metatarsal-phalanges zone for application of pressure by the foot of the skier during the impulse phase, thereby defining an impulse zone;
- and
- a slit formed within the central portion and having a predetermined longitudinal length of between 150-300 millimeters and extending transversely across the entire width of the ski, the slit being formed between an upper beam and a lower beam at least in the boot support zone, the upper and lower beams having opposed inner surfaces which are spaced apart by a substantially constant distance along the predetermined longitudinal length of the slit in the rest position of the ski, the slit extending forwardly beyond the impulse zone.
A cross-country ski for practicing alternating steps, including an impulse phase and a sliding phase, said cross country-ski comprising:
- a central portion, said central portion having an upward camber at least in a rest position of the ski and being adapted to support a ski boot at a boot support zone, the boot support zone having a heel zone for application of pressure by the foot of a skier during the sliding phase and a metatarsal-phalanges zone for application of pressure by the foot of the skier during the impulse phase, thereby defining an impulse zone;
- and
- a slit having a predetermined length and extending transversely across the entire width of the ski, the slit being formed between an upper beam and a lower beam at least in the boot support zone, the slit extending forwardly beyond the impulse zone, wherein the slit has longitudinally extending inner surfaces which are spaced apart by a substantially constant distance in the rest position of the ski and wherein the slit extends obliquely with respect to the upper and lower surfaces of the ski.
A cross-country ski for practicing alternating steps, including an impulse phase and a liding phase, said cross country-ski comprising:
- a central portion, said central portion having an upward camber at least in a rest position of the ski and being adapted to support a ski boot at a boot support zone, the boot support zone having a heel zone for application of pressure by the foot of a skier during the sliding phase and a metatarsal-phalanges zone for application of pressure by the foot of the skier during the impulse phase, thereby defining an impulse zone;
- and
- a slit having a predetermined length and extending transversely across the entire width of the ski, the slit being formed between an upper beam and a lower beam at least in the boot support zone, the slit extending forwardly beyond the impulse zone, wherein the slit has a thickness that varies along the longitudinal length of the slit with minimum thickness at one end of the slit and maximum thickness at an opposite end of the slit.
A cross-country ski for practicing alternating steps, including an impulse phase and a sliding phase, said cross country-ski comprising:
- a central portion, said central portion having an upward camber at least in a rest position of the ski and being adpated to support a ski boot at a boot support zone, the boot support zone having a heel zone for application of pressure by the foot of a skier during the sliding phase and a metatarsal-phalanges zone for application of pressure by the foot of the skier during the impulse phase, thereby defining an impulse zone;
- said central portion having an upper portion and a lower portion, said lower portion having a pair of longitudinally extending, parallel lower sidewalls and said upper portion having a pair of longitudinally extending converging upper sidewalls;
- and
- a slit having a predetermined length and extending transversely across the entire width of the ski between the pair of upper sidewalls, the slit being formed between an upper beam and a lower beam at least in the boot support zone, the slit extending forwardly beyond the impulse zone.
A cross-country ski for practicing alternating steps, including an impulse phase and a sliding phase, said cross country-ski comprising:
- a central portion, said central portion having an upward camber at least in a rest position of the ski and being adapted to support a ski boot at a boot support zone, the boot support zone having a heel zone for application of pressure by the foot of a skier during the sliding phase and a metatarsal-phalanges zone for application of pressure by the foot of the skier during the impulse phase, thereby defining an impulse zone;
- and
- a slit having a predetermined length and extending transversely across the entire width of the ski, the slit being formed between an upper beam and a lower beam at least in the boot support zone, the slit extending forwardly beyond the impulse zone, the lower beam comprising a core of the ski, a sole of the ski and reinforcement elements of the ski, the slit comprising an upwarding facing recess formed in the lower beam, the upper beam covering the recess in the lower beam.
Dependencies are inferred from the claim text.