Land vehicles – Skates – Runner type
Patent
1994-08-12
1998-03-24
Johnson, Brian L.
Land vehicles
Skates
Runner type
280605, 280607, A63C 507, A63C 710
Patent
active
057304572
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is related to an apparatus for modifying the natural pressure distribution of a ski, such as especially an alpine ski, over its gliding surface.
The invention is also related to binding elements of a ski, and especially an alpine ski, which are equipped with an apparatus for modifying the pressure distribution of the ski over its gliding surface. The invention is also related to a ski, especially an alpine ski, which is equipped with an apparatus for modifying its pressure distribution over its gliding surface.
2. Description of Background and Relevant Information
Skis that are used for alpine skiing are constituted by relatively long beams on which, most often, the skiers boots are retained by front and rear binding elements. The boots and the binding elements are located approximately in the median zone of the ski, which is commonly known as the middle sole.
The skis themselves have a natural arch at rest. In addition, they have a certain flexibility. While skiing, the ski deforms elastically in response to the various forces to which it is subjected from the skier, and by reaction, from the surface on which it glides.
The main force to which the ski is subjected, originating from the skier, is generated by the skier's weight. This weight is located approximately in the middle sole zone of the ski.
The ski is also biased by the binding elements. It is, in fact, known that the binding elements pinch the boot. To do this, the rear binding element is generally slidably mounted, and is elastically returned forwardly by springs, which are known as return springs. The reaction to this pinching action is transmitted by the binding elements to the ski. However, this reaction is different depending on whether the front binding level of its front end and rear end, cursors by means of which a portion of the forces to which the ski is subject are transmitted vertically. However, this device has the disadvantage of mediocre performance, for a substantial space requirement. It is adapted from the case where both feet of the skier are in support on the same ski, so as to prevent the entire weight of the skier from being concentrated in the middle sole zone. Inversely, it would be mal-adapted in the case of a conventional pair of skis.
From Patent Application No. EP 409 749, an interface device is known comprising a plate which extends above the ski between two abutments affixed to the ski. A shock absorbing block is inserted between each end of the plate and the opposing abutment. According to a special embodiment, a screw, and if necessary, a spring exert a longitudinal pre-stress on the plate.
One can add that currently known devices exert a permanent pre-stress on the ski. Such a permanent pre-stress is detrimental because in the long run it is capable of causing an irreversible deformation of the ski.
One of the objects of the present invention is to propose a device which overcomes these disadvantages, and which enables adjustable pre-stressing of the ski in front of and behind the middle sole zone.
French Patent Application No. FR 2 513 132 describes a brake whose activation pedal comprises two levers journaled with respect to one another at their adjacent end. One of the levers is also journaled to a base affixed to the ski. The other journal bears the braking arms, and is connected to the base at the level of a slot oriented longitudinally. A spring exerts a return force on the movable end of this lever, which tends to fold the two levers against one another.
From European Patent Publication No. 409 749, an interface device is known, including a plate which extends above the ski between two abutments affixed to the ski. A shock absorbing block is inserted between each end of the plate and the opposing abutment. According to a particular embodiment, a screw and, if necessary, a spring exert a longitudinal pre-stress on the plate.
The operation of this device does not exert any significant influence on the ski. Indeed, it has relatively small di
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Couderc Bernard
Szafranski Pierre
Johnson Brian L.
Mar Michael
Salomen S.A.
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