Land vehicles – Skates – Shoe attaching means
Patent
1979-10-06
1982-06-29
Mitchell, David M.
Land vehicles
Skates
Shoe attaching means
280636, A63C 908
Patent
active
043369553
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a safety ski binding comprising a sole plate which is rotatably mounted on the ski surface in the heel region of the ski boot on a perpendicular pivot, is secured against lifting off, has a toe holder at its front end and has at its rear end a spring-loaded automatic heel mechanism for the ski boot that opens to release the ski boot on the occurrence of a frontal fall load exceeding the spring resistance.
In such a safety ski binding known from Swiss Pat. No. 460 610, the toe holder applied to the sole plate has no safety function whatsoever but only serves as a counterbearing for the ski boot. Instead, the safety function on rotary fall loading by the skier is assumed by a spring-loaded latch element which is secured to the ski and which at the same time holds the sole plate in its normal position parallel to the ski.
An important disadvantage of this safety ski binding is the fact that the ski boot and thus the skier remains connected to the ski during a rotary crash release and is therefore still subjected to the risk of injury. In addition, there is the danger that, on strong secondary impact of the ski with the ground, the lever effect of the ski boot, which may have been twisted at right-angles to the length of the ski, the sole plate connected to the ski only by the rotary bearing is torn off the ski.
Further, after such swivelling of the sole plate it is extremely cumbersome and laborious to revert to a condition ready for skiing because the skier must generally first open the automatic heel mechanism, for example with the ski stick, so as to release the ski boot, then swing the sole plate to the normal position by hand against the resistance of the latch element, whereafter it is at least possible to step into the binding again.
It is therefore the problem of the present invention to provide a safety ski binding of the stated kind in which there is complete release of the ski boot from the sole plate and thus from the ski on excessive rotary fall loading and wherein after release of the ski boot the sole plate is again automatically swung to its normal position parallel to the ski.
Based on a safety ski binding in accordance with the present invention, this is achieved in that the sole plate has a slideway in the toe as well as in the heel region of the ski boot for securing the sole plate against lifting off and that the automatic heel mechanism is designed to release the ski boot on the occurrence of an excessive rotary fall load and release takes place after overcoming the resistance of a separate spring.
This also avoids the disadvantage of a constant ratio between the releasing resistance for frontal and rotary fall loading--a disadvantage inherent with many plate bindings which, however, become released from the ski together with the ski boot.
A separate degree of movement for the automatic heel mechanism to release the ski boot on the occurrence of an excessive rotary fall load is achieved if the automatic heel mechanism is hinged to a housing and the housing is displaceable on the sole plate lengthwise of the ski.
In this case it has been found desirable for a lock controlled in dependence on the rotary angle of the sole plate to be provided between the housing and the sole plate.
A particularly rapid release of the automatic heel mechanism on reaching the excessive rotary fall load is ensured if a helical compression spring is provided which is supported on the sole plate and acts on the housing of the automatic heel mechanism in the opening sense.
In a constructional embodiment of the invention, the automatic heel mechanism comprises a freeing lever provided with a lug which forms the counter abutment for an abutment on the sole plate limiting the displacement of the housing. In this way, in the case of a rotary fall release when the heel retainer has to be opened to permit stepping into the binding again the retainer is automatically displaced on the ski to the stepping in position together with its housing.
Particularly for the purpose of enabling a safety ski
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patent: 4185852 (1980-01-01), Himmetsberger et al.
patent: 4190264 (1980-02-01), Himmetsberger et al.
Marker Hannes
Mitchell David M.
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