RU2569792C1 - Cross-country skis for skate skiing - Google Patents

Abstract

FIELD: sports.

SUBSTANCE: construction of cross-country skis for skate skiing comprises a load platform, a sliding surface and the rails on the sliding surface, it is achieved in that the rails are located on the part of the sliding surface adjacent to the inner edging of the cross-country skiing, along the axis of the ski from toe to heel, have a height at the level of the sliding surface, and the depth of the rails increases from the inner edging of the cross-country skis to its axis.

EFFECT: creation of a sliding surface with high efficiency of sliding in a wide range of environmental conditions and with a special machining of the part of the sliding surface to prevent lateral slippage, improvement of controllability of cross-country skis and achievement of high performance in competitions.

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Description

This invention relates to the field of creating cross-country skiing for skating.

The use of cross-country skiing on a hard snowy track often leads to lateral sliding of the ski at the end of the skating repulsion phase. One of the reasons for this is the uneven distribution of ski pressure on the track along the length and width of the sliding surface of the ski. At the points of maximum ski pressure, the permissible shear stress of the snow cover is exceeded, which leads to lateral sliding of the ski. Lateral ski slides significantly reduce the skier’s sliding efficiency and impede the achievement of high sports results.

When moving on poorly rugged terrain with the ridge style, the skier pushes with the ski, especially in the final stage of the push, at an angle of 35-45 ° to the track surface, which coincides with the natural position of the leg during the push. When moving uphill (the usual elevation angles are 8-12 ° and occupy up to 15% of all sports tracks), the ski incline must be increased by the amount of the incline, i.e., up to 50-60 °. An increase in the angle of inclination leads to a significant decrease in the speed of the skier and a deterioration in handling due to an increase in the number of slippage of the skis.

Well-known analogues of cross-country skiing construction are based:

- using a special ski form. The essence of the design is that in known skis containing a sliding surface, inner and outer edges of different lengths, bent and asymmetrically narrowed toe and heel, sections of the sliding surface in contact with the snow track and adjacent to the inner and outer edges are offset relative to each other in the longitudinal direction. [Pat. 2229915 Russian Federation, IPC7 A63C 5/044. Skis / Ryazanov A.G. - No. 2001112146/122001112146/12; declared 05/03/2001; publ. 06/10/2004].

- using a special form of a sliding surface. The essence of the design is the execution of the running surface of the ski in the form of a cylindrical arch, while the angle between the surface of the arch and each side surface of the ski is 90 °. [Pat. 2000832 Russian Federation, IPC5 A63C 5/044, A63C 5/04, A63C 5/048. Ski / Tsvilynyuk H. N. - No. 5035230; declared 03/31/1992; publ. 10/15/1993],

- on the ski construction [Pat. 2104075 Russian Federation, IPC7 A63C 5/044, A63C 5/04. Ski / Aznabaev Askat Akhmetovich; Applicant and patent holder - No. 95110032/12; declared 06/14/1995; publ. 02/10/1998], selected as a prototype of cross-country skiing, comprising a cargo area, a sliding surface and guides on a sliding surface having a horizontal sliding plane and descending from the center of gravity of the ski to the front and rear parts of the sliding surface at a distance of 0.2-0 , 25 of its length.

The design of cross-country skiing according to the prototype has several disadvantages. The main disadvantages are:

- poor controllability of skis in soft snow, when the skis, when turning, fall deep into the snowy track and rely not only on the edge, but also on the sliding surface,

- high resistance to movement, due to the implementation of the guides on the sliding surface convex, which creates an unstable position of the structure and requires additional expenditure of muscle energy to ensure a stable position of the ski on the track.

The technical problem to be solved of the invention is to create a sliding surface with high sliding efficiency in a wide range of external conditions and with special machining of a part of the sliding surface to prevent lateral sliding, improve the controllability of cross-country skiing, reduce the resistance to movement, increase the stability of the position of the skis on the track and achieve high competition results.

The technical problem to be solved in cross-country skiing for skating, containing a cargo area, a sliding surface and guides on a sliding surface, is achieved by the fact that the guides are located on a part of the sliding surface adjacent to the inner edge of the cross-country ski, along the axis of the ski from toe to heel, have a height at the level of the sliding surface and the depth of the guides increases from the inner edge of the cross-country ski to its axis. Guides on a sliding surface are applied by any known method, for example, by milling, turning by a cutter [Shtuchny B.P. Machining of plastics. - M.: Mechanical Engineering, 1987. - 152 p. ]. The number, geometry and dimensions of the transverse profile of the guides on a sliding surface correspond to the high efficiency of transferring the energy of the push of the skier into the translational motion and are determined experimentally for each specific case (weather conditions, stiffness of the track, etc.).

In FIG. 1 shows a General view of the proposed design of a cross-country ski for skating; in FIG. 2 is a section AA in FIG. 1 with a triangular design of guides, the depth of which increases from the inner edge of the cross-country ski to the axis of the sliding surface; in FIG. 3 is a section AA in FIG. 1 with the forces acting at the moment when the skier is pushing with the ski while performing a cross-country ski like the prototype of the invention; in FIG. 4 is a section AA in FIG. 1 with the forces acting at the moment when the skier pushes with the ski while performing the cross-country skiing according to the invention.

The cross-country skis shown in FIG. 1-2, contain a cargo area 1, a sliding surface 2 and guides 3, which can be made triangular, rectangular, trapezoidal, sinusoidal, of various depths not exceeding the thickness of the sliding surface, for example, not more than 1.5 mm. The guides can be located on a part of the sliding surface adjacent to the inner edge of the cross-country skiing, and occupying, for example, 1/3 of the sliding surface.

The cargo area 1 of a cross-country ski for a skating course is a multi-layer structure that provides the required mechanical properties of the ski, for example, such as strength, bending and twisting elasticity, etc.

Consider the mechanism of cross-country skiing for the ridge according to the prototype (Fig. 3) and with a sliding surface containing guides located on a part of the sliding surface adjacent to the inner edge of the cross-country ski along the axis of the ski from the toe to the heel and having a height at the level of the sliding surface , at the moment when the skier pushes the ski (Fig. 4), i.e. according to the invention.

From the side of the ski track (ski run), the reaction force of the support F (perpendicular to the sliding surface of the ski) and the friction force F _Tr (in the plane of the sliding surface) act on the ski (Fig. 3-4). The pressure force P on the ski side from the ski side can only be compensated by the reaction force of the support, since the friction force on snow for the ski is negligible. The reaction force of the support is directed perpendicular to the contact surface of the ski with the track. Therefore, if a ski with a flat sliding surface is edged as shown in FIG. 3 - according to the prototype, the edging angle will be insufficient to prevent slipping. The force P will be uncompensated, and the ski, freely slipping out of the cut track, enters the slip mode. When using a cross-country ski with a sliding surface containing guides (Fig. 4), located on the part of the sliding surface adjacent to the inner edge of the cross-country ski, along the axis of the ski from toe to heel and having a height at the level of the sliding surface and skiing with edging angles close to the minimum required value, as shown in FIG. 4 - according to the invention, the risk of ski slippage is significantly reduced, which increases controllability, increases sliding efficiency, decreases resistance to movement, increases the stability of the position of the skis on the ski. This is achieved by increasing the friction force on snow for skiing in the transverse direction. Thus, there is no need to complicate the geometry of the ski, namely, to make guides that protrude beyond the plane of the sliding surface, as indicated in the prototype.

Claims (1)

Cross-country skis for skating, containing a cargo area, a sliding surface and guides on a sliding surface, characterized in that the guides are located on a part of the sliding surface adjacent to the inner edge of the cross-country ski, along the axis of the ski from the toe to the heel, have a height at the level of the sliding surface and the depth of the guides increases from the inner edge of the cross-country ski to its axis.

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