Land vehicles – Skates – Shoe attaching means
Patent
1986-12-03
1989-06-27
Marmor, Charles A.
Land vehicles
Skates
Shoe attaching means
A63C 910
Patent
active
048422940
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to sporting gear, and more specifically, to ski binding for cross-country skis.
PRIOR ART
Today we witness a transition from a widely employed "Racing Norm 38" type boot to a "Racing Norm 50" type boot. When the skier uses classical stride on a well-prepared track the first of the two above-mentioned types is preferable because a narrower boot sole toe portion provides for more effective pushing of the skier. a considerably smaller effort is needed to overcome the resistance of the sole to bending towards the tip of the ski due to a narrower boot sole toe portion. The use of skating stride makes much higher demands of the sole twisting resistance. Under these conditions a prior art ski binding of the "Rotafella" type provides for higher rigidity, i.e. a better control of the ski. But this type of bindings does not also meet all the necessary requirements, e.g. from the standpoint of skating stride, as the sole twisting occurs.
It is known that the cross-section area of the ski boot plastic sole grows in the direction from the sole toe to its heel. The cross-section area of the boot is the largest in the skier's foot area.
On one hand, when the boot is locked to the ski in the skier's foot area the sole resistance to twisting steeply increases which is of special importance when skating stride is used as the breaking moments acting on the binding grow weaker. But locking the boot in said area is complicated by the relative complexity of designing a lock that would ensure the locking of the boot in said area while at the same time meeting all the specified operating requirements.
On the other hand, when the boot is locked in the foot area the sole resistance to bending in the vertical plane towards the ski toe is increased causing a reduction in the skier's pushing efficiency when classical stride is used.
Bearing this in mind it can be inferred that depending on the stride used (classical or skating) and the track condition (snow, ice-crust) it is expedient to choose the optimum boot sole resistance-to-twisting ratio which, in its turn, determines the boot sole resistance to bending in the abovementioned vertical plane. The latter result may be attained by shifting the sole locking area along the boot axis. But shifting the sole locking area along the axis of one and the same boot is a very complicated task as such a solution does not agree with prior art binding designs.
There is a prior art ski binding which consists of rest pins, of two parts each, and a lock that restrains the boot vertical movement (cf. FRG Patent Application as published for opposition No. 3240750, IPC A 630). One part of each pin is directly fixed in the ski (boot) body, the other part fits in the corresponding boot sole (ski) hole. If the bottom part of the pin is fixed in the ski body, then, in order to lock the boot it is necessary to place it so that upper parts of the pins fit in the corresponding holes in the boot sole toe. To restrain the boot vertical movement various locks are employed. Advantages of said binding include relatively high adaptability to manufacture and simple design, its quick mounting and dismantling, use of different types of locks. Disadvantages include relatively poor functional qualities of the binding when locking and unlocking the boot because this can be done only manually.
A prior art binding (cf. FRG Pat. No. G 8425984.1, IPC A 63C) comprises ski-mounted rest pins for mating with corresponding holes in the boot sole toe and a lock featured as a bracket-shaped blade spring for straddling from above the boot sole toe and having one end attached to the ski. Relatively high adaptability to manufacture, low production cost, small overall dimensions, light weight, automatic (no need to use hands) locking of the boot to the ski may be cited among its advantages. But the binding may be used only with a ski boot that has a projecting sole toe or a welt. When the skier pushes a horizontal component force perpendicular to the ski longitudinal axis occurs and a s
REFERENCES:
patent: 4353576 (1982-10-01), Salomon
patent: 4487427 (1984-12-01), Salomon
Camby Richard
Leningradsky Politekhnichesky Institut
Marmor Charles A.
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