Land vehicles – Skates – Shoe attaching means
Patent
1991-12-04
1993-04-06
Culbreth, Eric D.
Land vehicles
Skates
Shoe attaching means
280607, 280634, A63C 9081
Patent
active
051997363
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a safety ski binding.
In a known plate-type safety ski binding of that kind (EP-A69 753), the sole plate on which the ski boot rests in use is connected to the ski by way of a pivot pin and resiliently fixed in a central position, in relation to a lateral pivotal deflection movement, by a holder which is arranged at the rear end of the sole plate. The holder has a base plate which is fixed with respect to the ski and which at its rearward edge is in the form of a curved track or path with a central retaining recess. Mounted at the rearward end of the sole plate, on an axially movable pin member, is a roller which is urged under the force of a strong spring into the retaining recess in the curved path or track and thereby fixes the central position of the sole plate. If the leg of the skier is subjected to the action of a torque which loads the sole plate in the direction of a lateral pivotal deflection movement, the holder then resists that pivotal deflection movement until the torque is such as to urge the roller out of the central retaining recess and on to the adjoining side portions of the curved path or track. Those side portions do not oppose any further lateral resistance to the roller so that the sole plate can be pivotally deflected sideways and the torque loading acting on the leg of the skier decreases.
The spring load which acts on the roller is considerable. By virtue of that spring force, on the one hand, the sole plate is correspondingly strongly pulled against the peripheral surface of the pivot pin, while on the other hand a corresponding reaction pressure force is formed in the portion of the ski between the pivot pin and the curved path or track. The strong pressure of the pin mounting in the sole plate against the peripheral surface of the pivot pin increases the degree of pin friction, in particular upon lateral pivotal movement of the sole plate; the pressure force which is operative in the ski can have a disadvantageous effect on the flexural characteristics of the ski and the flexural stresses which occur in the surface of the ski when the ski flexes.
Therefore the object of the present invention is that of proposing, on a safety ski binding of the specified kind, a holder for fixing the sole plate in its central position and for controlling same upon lateral pivotal deflection movement, which keeps the pivot pin free from increased friction and the ski portion between the pivot pin and the holder free from undesirable loadings. The invention further seeks to provide that the sole plate and the holder are still of a simple structure and easy to assemble.
As, in accordance with the invention, the sole plate is centered in its central position by a support for the pivot lever, which support is lateral as viewed in the longitudinal direction of the ski, the spring load which acts on the pivot lever and which must be overcome upon lateral release of the sole plate cannot give rise to any stressing of the sole plate and the ski in the longitudinal direction. For, at most the frictional force which results between the pivotal lever and the abutment is operative in the longitudinal direction of the ski. At the moment of lateral release therefore the pivot pin of the sole plate is substantially relieved of the effect of additional frictional forces so that easy pivotability of the sole plate is guaranteed, even when the ski binding involves high adjustment forces. In addition, no disadvantageous influences are exerted on the flexural characteristics of the ski, due to the fact that the portion of the ski between the pivot pin and the holder is no longer subjected to a loading.
The requirement for the ski binding to be kept free of holding forces which are operative in the longitudinal direction of the ski, as the invention seeks to achieve, is that the abutment is arranged laterally, as viewed in the longitudinal direction of the ski, relative to the pivot lever. That is achieved by any arrangement of the pivot axis of the pivot lever in a plane which is parallel to
REFERENCES:
patent: 3950003 (1976-04-01), Korger
patent: 4957305 (1990-09-01), Freisinger et al.
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