JPS60215382A - Production of ski - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ski manufacturing method, and more particularly, to a ski manufacturing method that significantly facilitates the formation of concave grooves on the ski running surface, which have a great influence on the performance of the ski. The present invention also relates to a method for manufacturing skis that can be precisely formed into a required shape.

Grooves formed on skis that come into direct contact with the snow surface directly affect the performance of the ski, and there is a very delicate relationship between the structure of the grooves and the performance of the ski. Skis with a flat running surface were unstable even though they could be skied in a straight line, so grooves were added to the skis. Performance other than performance was also required, and for this reason, it was necessary to not only provide straight-line stability due to deep grooves and sharp corners with the running surface, although this may be contradictory, but also to provide shallow and rounded corners to satisfy rotational performance. Rotation performance due to the concave groove is also required. Moreover, from the point of view of turning performance, it is not enough to simply be able to turn easily; if the ski cannot turn sharply without drifting, it cannot be called a high-performance ski. Since the depth of the grooves and the sharpness of the corners are required, it is necessary to have a balance that is good for rotation and stable for straight downhill and sloped downhill. Furthermore, the relationship between the trigger for rotation and the structure of the groove, the ability to easily operate the ski during parallel turns without getting caught, and the relationship between the ski that does not allow the tail to flow and the structure of the groove in the rear half of the ski, etc. , the beginning of the groove,
By optimizing the depth of the grooves at the intermediate position, near the rear end, and at the end, the sharpness of the corners, the angle of incidence of the grooves from the sliding surface, etc. at each position, we can create skis for speed competitions and downhill skis. , it can be made into a ski suitable for large slalom skis, slalom skis, and general skis, and this shape provides stability in high-speed turns, a wide range of application that can be turned even in ice burns, evil spirits, and fresh snow, and a ski that can be used continuously. Because the ease with which the trigger for rotation can be detected changes significantly, extremely specialized measures are required that cannot be determined in general.

When forming grooves on ski running surfaces, which have such a complex and subtle effect on ski performance, there is a very questionable question as to what methods have been used to form grooves in the past. . Up until now, a ski running surface made of polyethylene resin, such as so-called polysol, has been fixed to the ski body using various methods, and then the center of the ski running surface has been carved out using a method that exposes the central axis of the ski. The final product is made after visually determining the shape of the groove by manually adjusting the number of cuts and the strength of the cutting force, which is extremely difficult due to the uneven width of the ski and the presence of an arch hend. , Inaccurate groove forming work is performed due to manual negligence while performing central axis indexing work. For this reason, it is difficult to form precise grooves at all, and there are clearly differences in the performance of skis that are not obvious from the mere appearance. He considers this essential and spends a lot of time making adjustments himself. In addition to these drawbacks, in the ski manufacturing process, the number of man-hours required to individually carve a large number of skis is large and time consuming, resulting in a significant increase in the price of each ski.

This invention has been made in view of the above points, and its object is to create a gap in the mold corresponding to the thickness distribution of the core so that the ski lower surface component and the ski upper surface component can be separated. In the method of manufacturing skis in which foamable resin is injected into the gap, a groove having a shape corresponding to the shape of the groove to be formed along the center of the ski running surface is formed on the inner surface of the lower mold. A ski manufacturing method comprising the steps of: providing a protrusion; and pressing a ski lower surface component against the inner surface of the lower mold using the foaming pressure of the foamable resin to form a groove corresponding to the protrusion. It is on offer.

Embodiments of the ski manufacturing method according to the present invention will be described in detail below with reference to the drawings.

At the center of the inner bottom surface of the ski-shaped lower mold 10, the required planar shape length of the groove 12 required for the ski along the ski axis, the depth of the groove, the angle of incidence to the groove, and the sharpness of the corner are determined. A sliding face plate 2 comprising a protrusion 14 of a corresponding shape that can be formed, a steel edge 16 on the periphery in the lower mold 10, and a large number of columnar small protrusions 18 regularly protruding from the upper surface.
A core body 24 having several longitudinal grooves 22 in the ski axis direction cut into the upper and lower surfaces thereof is placed on the running face plate 20, and the core core body 24 is placed on the ski face plate 20, and the core core body 24 is placed on the ski face plate 20. The groove 20 is fitted. Next, the core core body 2 is placed on the core core body 24.
4. Using a laminated material of a resin sheet such as ABS resin and a flexible reinforcing material such as glass cloth as the top plate, which is formed by regularly arranging a large number of columnar small protrusions that fit into the vertical grooves 22 on the top surface, After forming the underframe, the upper mold 26 is placed and the mold is clamped, and a foamed synthetic resin 28 is injected from the injection port for foamable resin such as urethane foam provided at the required part of the mold, and foamed. After curing, the ski is removed from the mold and undergoes a finishing process that includes polishing and painting to create a finished ski. The grooves 12 on the ski sliding surface are formed on the inner bottom surface of the lower mold 10 by pressing the sliding surface plate 2o, which has a smooth flat bottom surface, with heat generated during foaming of a foamable resin such as urethane foam, and with great pressure. The ski is molded at the same time as the injection molding of the ski by making a precise mold of the outer shape of the protrusion 14 by pressing down and crimping the protrusion 14 strongly and evenly, and fixing it after the foamed resin has solidified. This eliminates the need for any process such as punching after removal from the mold, making it possible to create recesses with precise shapes such as being extremely long, narrow, and having different angles of incidence on the recessed groove between the front end and other parts. Grooves can be easily formed at the same time as ski forming. Therefore, it is possible to obtain skis with extremely precise centering without any trouble such as centering.

Note that the sliding surface plate 20 may be a simple flat plate,
The small columnar protrusions 18 on the upper surface seen in the embodiments are not necessarily necessary. Furthermore, the presence or absence of the core body 24 is not related to the formation of the groove 12, and the shape of the ski top plate is also arbitrary. The post-foamability is achieved by incorporating the upper mold into a mold having an inflection surface in which at least the longitudinal cross-sectional shape of the circular top surface changes from concave upward to convex upward toward the center. By injecting resin, a chevron-shaped protrusion is formed on the upper surface of the ski that extends from the center of the ski toward the tip and the rear edge, making it difficult to manufacture high-performance injection skis with excellent bending elasticity. In addition, by making the running face plate of the ski thin, it is easy to make the cross-sectional form of the grooves have the same wall thickness. In other words, in the past, in order to carve out the grooves 12, the thickness of the running surface plate, which does not contribute to the strength of the ski, was unnecessarily increased (Fig. 4). When using the gate configuration method during injection, the thickness of the sliding face plate can be limited to the truly required thickness, and the thickness of the sliding face plate can be significantly reduced.

This shortens the distance between the sliding surface and the foamed resin core with excellent heat insulation properties, making it possible to obtain the most ideal ski based on the empirical rule in skiing that the higher the heat insulation properties, the better the skiing will be.

In this way, when using the ski manufacturing method according to the present invention,
The injection molding method not only aims to save labor in the ski manufacturing process, but also improves its precision, uniformity, and glide performance, and was previously thought to be difficult to fully apply to molding the protruding parts of skis. This was achieved by incorporating a method that had not been conceived of before and had never been attempted before the present invention, in which a sliding face plate was pressed down to form a concave portion, so to speak. It is something that can be played.

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

[Brief explanation of the drawing]

The drawings relate to the ski manufacturing method according to the present invention, and FIG. 1 is a partial cross-sectional perspective view of a mold, FIG. 2 is a partial cross-sectional perspective view of the ski, FIG. 3 is a partial cross-sectional view of the ski, and FIG. FIG. 10...Lower mold, 12...Concave groove. 14... Projection, 16... Steel edge. 18... Columnar small projection, 20... Sliding face plate. 22... Vertical groove, 24... Core body. 26... Upper mold, 28... Foamed synthetic resin. Figure 1 Figure 2

Claims (1)

[Claims] (2) A method for manufacturing skis, in which a ski lower surface component and a ski upper surface component are arranged in a mold with a gap corresponding to the thickness distribution of the core, and foamed resin is injected into the gap. In this step, a protrusion having a shape corresponding to the shape of the groove to be formed along the center of the ski running surface is provided on the inner surface of the lower mold of the mold, and the ski lower surface structure is formed by the foaming pressure of the foamable resin. A ski manufacturing method comprising: pressing a member against the inner surface of the lower mold to form a groove corresponding to the protrusion.