Land vehicles – Skates – Shoe attaching means
Patent
1986-10-22
1988-07-19
Mitchell, David M.
Land vehicles
Skates
Shoe attaching means
280624, 280636, A63C 900
Patent
active
047580160
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a device, which includes a binding element, to fasten a cross-country ski booth on a cross-country ski. By means of this device, the foot can be pivoted about an axis that runs diagonal to the long direction of the ski, in the course of the running motion.
Such a device is described, for instance, in the DE-OS No. 33 15 641 and is used to improve the trueness of the track of the cross-country ski in the course of conventional cross-country skiing in a diagonal step. For this purpose, the two pivoting axes of the pair of skis converge towards the front, i.e. their imagined intersection point lies closest to the tips of the skis. When the foot is raised in the diagonal step, where the motional sequence resembles that of a normal walking or running motion, the slanted pivoting axis causes the foot to be able to approximately follow the natural course of motion without exerting a torque on the ski that is running in the track or that is lifted from t at the rear. A slight slant of the sole of the foot towards the outside is not particularly bothersome here.
An outwardly tilting pivoting motion displaces the toes outward, the heel somewhat inward, and the knee somewhat outward. Such a displacement of the parts of the body, however, is contrary to the anatomically based course of motion in a skating step, such as must also be used according to conventional cross-country technique. In the push-off phase, an outwardly tilting motion of the foot is extremely unfavorable.
The invention now has the aim of creating a device of the type mentioned in the introduction, which accommodates the course of the motion especially in a one-sided or double-sided skating step.
According to the invention, this aim is now achieved by each axis running from an intersection point at the inside through a point on the outside which lies closer to the tip of the ski than the intersection point of the axes.
For the skating step, the main advantages of this arrangement lie in the inward pivoting of the turned-out leg and thus in the ergonomically more favorable position of the force application point, in an increase of the push-off pressure and/or an extension of the push-off phase, where the stress and the risks of injury for the joints at the foot, leg, and hip are simultaneously reduced. It is preferred that the axis runs at an angle between 5.degree. and 20.degree. to the ski surface. In this case, even in the conventional diagonal step, this arrangement of the pivoting axis causes a displacement of the heel inward, while the knee region essentially remains in the same position. Relative to the heel, the knee is therefore also displaced outwardly.
In a preferred embodiment, the axis runs in the region below the imagined rotation axis of the toe joints of a foot situated in a cross-country ski. The axis is primarily designed as a physical axle bolt.
This makes it unnecessary to design a boot with a sole that is matched to the roll-off motion of the foot, so that in further preferred embodiments, the sole of the cross-country ski boot can be designed roll-off-stiff and/or torsion-stiff. The roll-off-stiff design of the boot sole causes the toe joints and the associated musculature to be relieved of stress. In addition, the torsion stiffness causes a much better transfer of the lateral forces. The cross-country ski can be guided easier, and the previous assembly of guide plates and support plates on the ski can be omitted.
A binding element is required for fastening a boot onto a ski. Thus various possibilities arise for arranging the axis. In a first preferred possibility, the axis or the axle bolt runs through the sole of the cross-country ski boot, in which there is at least one boring which is flush with the axle. This design can be implemented especially easily if the sole is designed roll-off-stiff, since it can then be made in the necessary or arbitrary thickness. A thick boot sole is always an advantage because it reduces friction losses, both with an edge use in a skating step and in a deeper track with the
REFERENCES:
patent: 4262925 (1981-04-01), Plenk
patent: 4309833 (1982-01-01), Salomon
patent: 4410199 (1983-10-01), Eisenberg
patent: 4498687 (1985-02-01), Salomon et al.
Johnson Brian L.
Mitchell David M.
TMC Corporation
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