Land vehicles – Skates – Shoe attaching means
Patent
1986-12-12
1988-06-07
Love, John J.
Land vehicles
Skates
Shoe attaching means
A63C 918
Patent
active
047492082
DESCRIPTION:
BRIEF SUMMARY
The invention relates to sporting gear, and more specifically, to a ski binding for cross-country skis.
The invention may be effectively used both for sporting cross-country skis and for touring cross-country skis.
Today we witness the dramatic growth and changes of the standards that the sporting gear must meet. As the skating stride is gaining popularity, it has become necessary to enhance the ski boot sole resistance to twisting, because in this way the skier over a long period of time runs on the ski edge. In this case the sliding surface of the ski (and the boot sole surface as well) forms a substantial angle with the surface of the ski-track bringing about strong twisting moments with respect to the boot sole when the skier pushes.
PRIOR ART
At present an "Adidas" ski binding is widely used, that consists of a plate with side-frames set at an angle to the longitudinal axis of the ski. The plate size and the value of the side-frames slope are determined by the size and shape of the boot sole toe. The binding is designed for use with a ski boot that has a flange on the upper surface of the boot sole toe. The binding lock is designed in the following way. The plate carries a pin to which a lever is fixed that has still another pin at its free end. To this latter pin a second lever is fixed, in its turn, the free end thereof holding down the flange of the boot sole toe.
The lock the boot the skier must rest the end of the second lever against the boot flange and press the first lever which in this case keeps turning until the line connecting the two pins becomes lower than the line connecting the first pin with the rest point. In this position the boot gets locked. Disadvantages of said binding include its considerable weight, relatively low adaptability to manufacture, resulting mainly from high complexity of the lock design, considerable torques arising in the horizontal plane, the latter disadvantage being especially serious when the skier uses a skating stride. Strong sole twisting is caused not only by the binding design but also by a narrow sole toe of a "Racing Norm 38" type boot which has a narrower toe as compared to a "Racing Norm 50" type.
Ski bindings of the "Rotafella" type are widely used nowadays. This binding also consists of a plate with side-frames set at an angle to the longitudinal axis of the ski. As distinct from the "Adidas" binding, it has three pins mounted directly on the plate, which mate with the holes in the boot sole toe. The boot is locked with a shackle, free ends of which are set in sleeves of side-frames. In the foremost part of the binding there is an axle carrying a notched plate. The boot is placed in such a way that the holes in the boot sole toe mate with the pins. Then the skier presses the shackle into engagement with one of the notches in the plate. Modifications of the binding may have different types of locks. Secure boot looking and a smaller torque occuring in the plane perpendicular to the ski longitudinal axis as compared to the "Adidas" binding mentioned above may be cited as advantages of said binding. Disadvantages include its considerable weight, relatively low adaptability of the binding and the lock to manufacture and, in particular, the necessity to use hands (poles) when locking and unlocking the boot.
As the boot sole toe portion grows wider it is followed by an increase in the force opposing its bending in the vertical plane, oriented along the longitudinal axis of the ski. Said negative phenomenon is clearly enough manifested when the skier uses a classical stride. Thus, the two ski binding designs cited above illustrate the fact that there exists a contradiction: the better the ski binding is adapted to a classical stride the worse it functions when a skating stride is used. It is evident that with a classical stride the ski binding adapted to the "Racing Norm 38" type boot functions better than with a skating stride as compared to the binding adapted to the "Racing Norm 50" type boot. It is quite the opposite when a skating stride is used.
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REFERENCES:
patent: 4017096 (1977-04-01), Pinsonnault
patent: 4102063 (1978-07-01), Ihlen
patent: 4322091 (1982-03-01), Storandt
Leningradsky Politekhnichesky Institut Imeni M.I. Kalinina
Love John J.
Mar Michael
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