Ski-binding arrangement to fix a ski boot to a ski, in particula

Details Ski-binding arrangement to fix a ski boot to a ski, in particula Ski-binding arrangement to fix a ski boot to a ski, in particula

1996-04-12

1998-09-08

Johnson, Brian L.

Land vehicles

Skates

Shoe attaching means

280607, 280618, 280636, A63C 908

Patent

active

058034803

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE PRESENT INVENTION

The invention relates to a ski-binding arrangement to fix a ski boot to a ski, in particular a touring or cross-country ski, with a latch mechanism to fix the front end of the ski boot to the ski in such a way that the metatarsus and heel can be raised freely from the upper surface of the ski, wherein the latch mechanism can be attached to a holding plate and the latter is disposed so as to be laterally rotatable about an axis perpendicular to the upper surface of the ski against the action of spring-braced elements of a locking mechanism, to such an extent that it is completely freed from the ski.
A safety binding of this kind has been disclosed, for example in DE 29 07 365 C2 or DE 33 10 739 C2. The known bindings of the stated kind are distinguished either by a holding plate anchored firmly to the ski or by holding plates which, although they do come entirely free from the ski when released, then swing out to the side about an axis of rotation situated in the back region of the holding plate or even at its back end. With this latter embodiment, to ensure release of the binding the boot and holding plate must be in torque-transmitting engagement by way of holding elements in the metatarsal region, so that the necessary releasing torque can be transmitted to the holding plate. As a result, it cannot be guaranteed that the binding will release when the metatarsus and heel are raised; the torque, which in this case is exerted only on the latched tip of the boot, is not sufficient to unlatch the holding plate. The consequence can be fracture of the toes or metatarsal bones.
The same consequences can occur in the case of safety ski bindings with holding plates firmly anchored to the ski.


SUMMARY OF THE PRESENT INVENTION

It is therefore the object of the present invention to produce a ski-binding arrangement of the kind cited at the outset that releases reliably even when the metatarsus or heel is raised, the construction simultaneously being made extremely compact.
In accordance with an aspect of the invention, a holding plate in accordance with the invention is supported at its extreme front end on the ski or on a retaining part mounted on the upper ski surface in such a way that it can rotate to the side about its front end, whereas the locking mechanism is associated with the back end of the holding plate. As a result of this principle of construction, release of the holding plate or binding is guaranteed even if, for example, the heel is raised so that torque is exerted only on the tip of the boot, whch is latched to the holding plate. Functional reliability of the ski-binding arrangement in accordance with the invention is therefore considerably increased in comparison to known arrangements, with no need for additional structural elements that could make the binding arrangement less compact.
Preferably between the front and back ends of the holding plate the plate is held additionally by a slideway open toward the sides and fastened to the upper surface of the ski, so that the slideway determines the radius of rotation of the holding plate about its extreme front end. By this means the outward-swinging movement of the holding plate is defined. Furthermore, this measure allows the holding plate, after it has been freed from the ski, to be readily returned or swung back to its initial position. Finally, it also ensures that when the holding plate swings slightly outward it will be freed from the ski immediately. It very often happens that in a fairly gentle fall the holding plate swings only slightly outward, so that it is not released from the ski at all and hence can simply be swung back into the locked position.
A particularly simple and functionally reliable construction is distinguished by the nature of the swivel bearing at the extreme front end of the holding plate, which consists of a curved tongue on the one hand and a complementary tongue-receiving slot open toward the back on the other hand. The tongue-receiving slot has a double function. It serves both a

REFERENCES:
patent: 3752491 (1973-08-01), Fend
patent: 3764155 (1973-10-01), Perryman
patent: 3781028 (1973-12-01), Gertsch et al.
patent: 3951424 (1976-04-01), Napfin
patent: 4172602 (1979-10-01), Gertsch et al.
patent: 4928988 (1990-05-01), Hue
patent: 5518264 (1996-05-01), Broughton

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