JP3624245B2 - Ski - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a ski board used in alpine competitions, and in particular, by shifting the position of a torsional vibration node of a ski body to the vicinity of the foot side, which is a shoe placement site at a substantially central portion in the longitudinal direction of the ski. This improves the stability of the snow surface catch and improves the ski rotation operability.
[0002]
[Prior art]
Recently, skis used in alpine competitions in skiing events have a significant impact on the stability of the snow surface catch due to the position of the torsional vibration of the ski body at the time of transition from a right turn to a left turn in a slalom, for example. Has been confirmed to have an effect.
[0003]
Conventionally, in this type of ski plate, as shown in FIG. 10, the plate thickness from the shovel portion 1A of the ski first half portion F of the ski body 1 to the tail portion 1B of the ski second half portion R is the same as that of the ski first half portion F. The shoe placement site S at the center in the longitudinal direction of the ski that exists between the rear half of the ski R is thick, the size of the shovel 1A side and the tail 1B side is thin, and the ski bending stiffness distribution. Also, it has a configuration in which it is changed uniformly along the ski longitudinal direction so as to have a desired arch vent having both ground contact points A and B before and after skiing with respect to the snow surface G.
[0004]
[Problems to be solved by the invention]
However, in such a ski with a conventional structure, for example, when the overall length L of the ski body 1 is 2,000 mm, as shown in FIG. No. P of the primary torsional vibration Y1 on the ski front half part F side with respect to the torsional vibration Y around the position of 400 to 550 mm backward from the shovel part 1A, and the secondary torsional vibration on the ski rear part R side. Since the node Q of Y2 is designed to be positioned 200 to 350 mm forward from the tail portion 1B, that is, in the vicinity of the pre-ski grounding point A and the post-skiing grounding point B, shoes that are feet The position is far from the center point O of the placement site S.
[0005]
For this reason, for example, the followability on the ski front half part F side and the ski rear half part R side with respect to the ski torsional vibration of the shoe placement part S at the time of transition when shifting from the right turn to the left turn, etc. is poor, and snow surface catching is not possible. There is a problem that it becomes stable and easily causes a turn mistake, and hinders ski rotation operability.
[0006]
OBJECT OF THE INVENTION
The object of the present invention is to improve the stability of the snow surface catch at the time of turning and to improve the ski rotation operability by shifting the node of torsional vibration when sliding to near the foot side. It is to provide a ski plate.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides torsional rigidity and bending rigidity of at least one of the first half of the ski and the second half of the ski with the shoe placement portion in the middle of the ski in the longitudinal direction of the ski. In this case, in order to partially reduce the torsional rigidity and bending rigidity of the ski body, the pre-ski ground contact point and the shoe placement part or the second half of the ski can be used. Forming recesses over the desired range in the longitudinal direction of the ski at both ends in the ski width direction at the intermediate portion in the longitudinal direction of the ski between the ground contact point after skiing and the part where the shoe is placed, thereby reducing the plate thickness It is done by.
[0008]
Further, in the ski of the present invention, the shovel is formed by forming a concave portion whose depth is tapered toward the grounding point side in the shovel portion of the ski front half portion or the tail portion of the ski rear portion of the ski body. It is preferable to reduce the bending rigidity of the portion or the tail portion.
[0009]
Furthermore, as a form of the ski of this invention, what consists of a cross-section box type or cross-section sandwich type strength member is used suitably.
[0010]
[Action]
That is, according to the present invention, by adopting the above-described configuration, the intermediate portion in the longitudinal direction of the ski between the pre-ski grounding point in the first half of the ski and the shoe placement portion or the post-ski grounding point in the second half of the ski and the shoe placement portion. In order to reduce the board thickness and partially reduce the torsional rigidity and bending rigidity of the ski body in the ski width direction at both ends of the ski part in the ski width direction partly, The node of the torsional vibration of the ski body shifts to the foot side, which is the shoe placement site, and the followability of the ski front side and the ski rear side to the torsional vibration of the shoe placement site at the turn change is improved. As a result, the stability of the snow catch can be improved and the ski rotation operability can be improved.
[0011]
【Example】
Embodiments of the present invention will be described below in detail with reference to the drawings shown in FIGS. In the illustrated embodiment according to the present invention, the same reference numerals are used to denote the same parts as those of the conventional structure shown in FIGS.
[0012]
That is, in the ski according to the present invention, as shown in FIG. 4, the core portion of the ski body 1 has a strength member such as FRP around a core body 11 made of a non-strength member such as a hollow or foamed synthetic resin. 12 has a cross-section box shape in which 12 are continuously laminated, and a surface decorative material 13 is attached to the upper surface thereof, and sole edges 14 and 14 and a sliding surface material 15 are provided on the lower surface portion thereof. It is attached.
[0013]
As shown in FIG. 1, the ski body 1 has a thickness from the shovel portion 1A of the ski first half portion F to the tail portion 1B of the ski second half portion R between the ski first half portion F and the ski second half portion R. In the longitudinal direction of the ski, the shoe placement site S is thick, the shovel portion 1A side and the tail portion 1B side are thin in size distribution, and both the ground contact points A before and after the ski with respect to the snow surface G, A desired arch vent having B is provided.
[0014]
Further, as shown in FIG. 2 and FIG. 3, the pre-ski grounding point A and the shoe placement part S of the ski first half part F of the ski body 1, and the post ski contact point B and the shoe placement part S of the ski second part R. A pair of left and right first and second recesses 2, 2, 3, and 3 at the ski width direction both ends 1 a, 1 a in the intermediate portion in the longitudinal direction of the ski with respect to the center axis XX in the ski longitudinal direction As shown in FIGS. 5 and 6, the thicknesses t1 and t2 at both ends in the ski width direction of the intermediate portion in the longitudinal direction of the ski are set in the ski width direction. The thickness is made smaller than the plate thickness t of the central portion 1b.
[0015]
By the way, the formation positions of the first and second recesses 2, 2, 3, 3 are, for example, positions of 600 to 750 mm from the shovel portion 1 </ b> A toward the rear when the overall length L of the ski body 1 is 2,000 mm. L1 and the position L2 of 350 to 500 mm toward the front from the tail part 1B, the depths d1 and d2 are in the range of 2 to 5 mm over the length ranges D1 and D2 of 50 to 200 mm, respectively. The maximum constricted widths W1 and W2 in the respective ski width directions are in the range of 10 to 50% of the ski width dimension W.
[0016]
In the figure, reference numerals 4 and 5 denote third and fourth recesses formed in the shovel portion 1A and tail portion 1B of the ski body 1, respectively. The range of formation of the third recess 4 is from the shovel portion 1A. The fourth recess 5 is formed at a position L3 of 400 to 550 mm in the rearward direction, and further from the tail portion 1B to a position L4 of 200 to 350 mm in the front direction. 5a is formed to change the depth in a tapered shape, and as shown in FIGS. 7 and 8, by thinning the central part in the ski width direction, the running surface at the time of ski load is flattened. You may use it with the effect to keep.
[0017]
That is, according to the above-described configuration, the pre-ski grounding point A and the shoe placement part S of the ski first half part F of the ski body 1 and the post-ski grounding point B and the shoe placement part S of the ski second part R are defined as follows. A pair of left and right first and second recesses 2, 2, 3, and 3 are symmetrically formed with respect to the center axis XX in the ski longitudinal direction at both ends 1 a, 1 a in the ski width direction in the middle portion in the ski longitudinal direction. The ski body is formed in a streamline shape, and the thicknesses t1 and t2 at both ends in the ski width direction at the intermediate portion in the ski longitudinal direction are made smaller than the thickness t at the central portion 1b in the ski width direction. It becomes possible to partially reduce the torsional rigidity and the bending rigidity in the ski longitudinal direction intermediate part of the ski first half part F and the ski second half part R.
[0018]
As a result, the nodal point P of the primary torsional vibration Y1 on the ski front half part F side from the torsional vibration Y around the central axis XX along the longitudinal direction of the ski of the ski body 1 during skiing is rearward from the shovel portion 1A. 10 to 11, and the node Q of the secondary torsional vibration Y <b> 2 on the ski rear half portion R side moves forward from the tail portion 1 </ b> B to a position L <b> 2 of 350 to 500 mm toward FIG. 10 and FIG. 11. It is possible to shift the positions L1 and L2 of the primary and secondary torsional vibration nodes P and Q closer to the foot side, which is the shoe placement site S, than the conventional ski shown. The followability of the first half part F side and the second half part R side of the ski to the torsional vibration of the shoe placement part S of the ski is improved, and it is possible to improve the stability of the snow catch and to improve the ski rotation operation. Sex improvement of can be achieved.
[0019]
In the above-described embodiment, the first and second recesses 2, 2 and 3, 3 are formed in both the ski first half part F and the ski second half part R of the ski body 1, so that the ski first half part F and the ski are formed. Although the nodes P and Q of the primary and secondary torsional vibrations are provided in both the rear half part R, either one may be used. In this case, the primary torsional vibration of the ski first half part F or the ski first half part F and the ski second half part are provided. R secondary torsional vibration.
[0020]
Further, the third and fourth recesses 4 and 5 formed in the shovel portion 1A or the tail portion 1B may also be formed in either one corresponding to the formation of the nodes P and Q of torsional vibration.
[0021]
Furthermore, although the cross-sectional form of the ski body 1 has been described by taking a cross-sectional box type as an example, as shown in FIG. 9, strength members such as FRP are formed on both upper and lower surfaces of the core body 11 made of a non-strength member such as foamed synthetic resin. The present invention can also be applied to the cross-sectional sandwich type ski body 1 in which 12 is laminated.
[0022]
Further, as the material constituting the core body 11 of the ski body 1, wood or foam synthetic resin is used alone or in combination. Especially, as the foam synthetic resin, polyurethane resin, polystyrene resin or acrylic synthetic resin is used. Are preferably used.
[0023]
Further, as the woven or knitted form of the reinforcing fiber of FRP forming the strength member 12 of the ski body 1, for example, roving, plain woven cloth, twill cloth or bias cloth can be used. Even when the fibers are used alone or in combination of two or more, the effect of this structure can be obtained.
[0024]
Furthermore, the kind of material of the reinforcing fiber taking such various forms is preferably glass fiber, and if necessary, carbon fiber or other inorganic fiber or high elastic modulus organic fiber, any one kind alone or two kinds or more This is also effective when used in combination.
[0025]
Furthermore, as the synthetic resin for the matrix impregnated in the reinforcing fibers, an epoxy resin is preferably used, and an unsaturated polyester resin or an epoxy acrylate resin is used as necessary.
[0026]
Moreover, as the sliding surface material 15 which comprises the sliding surface side of the said ski main body 1, the sheet-like thing, such as a polyethylene resin, is attached and used, for example, and the thickness is 0.5 mm to 1.5 mm.
[0027]
Further, the sole edges 14, 14 attached to the edge portions on both sides in the ski width direction of the lower surface of the ski body 1 are preferably rectangular or L-shaped in cross section, and only a part thereof is exposed to the outside. Also, the material is made of metal such as carbon steel or stainless steel, or a hard thin film such as ceramics is formed on a part of the metal surface, or a hard synthetic resin (thermoplastic synthetic resin is also available) Etc.) can be used.
[0028]
As the type of the sole edge 14, either a continuous edge or a slitted edge can be used, and the thickness thereof is about 1 mm to 2 mm.
[0029]
Furthermore, ABS resin, nylon, polyester elastomer, nylon elastomer, PBT or the like is used as the surface decorative material 13 attached to the surface of the ski body 1.
[0030]
Further, in the case where the ski body 1 has a box-shaped cross section, it is possible to use metal instead of the FRP as the strength member 12.
[0031]
Further, when the ski body 1 has a cross-sectional sandwich type, the FRP strength member 12 can be reinforced with a metal reinforcing member.
[0032]
【The invention's effect】
As is apparent from the above description, the present invention is applied to the intermediate portion in the longitudinal direction of the ski between the pre-ski grounding point in the first half of the ski and the shoe placement portion or the post-ski grounding point in the second half of the ski and the shoe placement portion. The ski body at the time of skiing is formed by forming recesses at both ends in the ski width direction over the desired range in the longitudinal direction of the ski and reducing the plate thickness to partially reduce the torsional rigidity and bending rigidity of the ski body. The node of torsional vibration can be shifted to the vicinity of the foot side, which is the shoe placement site.
[0033]
As a result, the followability of the torsional vibration on the ski first half part side and the skiing second half part side to the torsional vibration of the shoe placement part at the time of turning can be improved, so that the stability of the snow surface catch can be improved. In addition, the ski rotation operability can be improved.
[0034]
Further, depending on the formation of the recesses at both ends in the ski width direction in the ski longitudinal direction intermediate part of the ski body, the recesses are tapered toward the rear side from the shovel part or the front side from the tail part at least one of the shovel part and the tail part. It is formed by changing the depth in a ball shape, and by reducing the thickness of the shovel part or tail part to reduce the bending rigidity, the characteristics of the ski torsional vibration can be further promoted, and in the ski width direction. By making the central portion thinner, the running surface during skiing can be kept flat.
[Brief description of the drawings]
FIG. 1 is a schematic side view showing an embodiment of a ski plate according to the present invention.
FIG. 2 is also a schematic plan view.
FIG. 3 is a schematic perspective view of the same.
4 is an enlarged cross-sectional view of a main part of a shoe placement site, taken along line II in FIG.
5 is an enlarged cross-sectional view of the main part of the first half of the ski, taken along the line II-II in FIG. 3; FIG.
6 is an enlarged cross-sectional view of the main part of the latter half of the ski, taken along the line III-III in FIG.
7 is an enlarged cross-sectional view of the main part of the shovel portion taken along the line IV-IV in FIG.
8 is an enlarged cross-sectional view of the main part of the tail portion taken along line V-V in FIG.
FIG. 9 is an enlarged cross-sectional view of a main part of a shoe mounting portion showing another cross-sectional sandwich type embodiment of a ski plate according to the present invention.
FIG. 10 is a schematic side view of a conventional ski.
FIG. 11 is a schematic plan view of a conventional ski.
[Explanation of symbols]
1 ... Ski body,
1A ... Shovel part,
1B …… Tail part,
1a, 1a: both ends in the ski width direction,
1b: Ski width direction center,
2, 2 ... the first recess,
3, 3 ... second recess,
4 ... Third recess,
5 ... Fourth recess,
A: Ground contact point before skiing,
B: Ground contact point after skiing,
D1... Front and rear length range of the first recess,
D2... Length range of the second recess
d1: Depth of the first recess,
d2: Depth of the second recess,
F: First half of skiing,
R: Ski later part,
S …… Shoe placement site,
L: Total ski length,
L1: formation position of the first recess,
L2: formation position of the second recess,
L3 ... the formation range position of the third recess,
L4: the formation range position of the fourth recess,
t: Plate thickness in the center of the ski width direction,
t1... thickness of the first recess formation position,
t2: the thickness of the second recess formation position,
W: Ski width dimension,
W1: Maximum constriction width of the first recess,
W2: Maximum constriction width of the second recess,
XX: Central axis along the longitudinal direction of the ski,
Y: Torsional vibration of the shoe placement site,
Y1 ... Torsional vibration in the first half of the ski
Y2 ... Torsional vibration of the second half of the ski
P: Torsional vibration node of the first half of the ski,
Q: The torsional vibration node of the second half of the ski,
G: Snow surface.

Claims (5)

At least between the pre-ski grounding point of the first half of the ski and the shoe placement part or the post-skiing grounding point of the second half of the ski and the shoe placement part, with the shoe placement part in the center of the ski in the longitudinal direction of the ski. The thickness of both ends in the ski width direction at one ski longitudinal direction intermediate portion is reduced, and the torsional rigidity and bending rigidity of at least one part of the ski first half part or ski second half part are partially reduced ,
A ski, wherein the nodes of primary and secondary torsional vibrations on the first half of the ski side are shifted from the vicinity of the pre-ski grounding point and the post-skiing grounding point to the vicinity of the foot, which is a shoe placement site . Ski front ground point ski half site and Kutsuno portion position or ski longitudinal recesses in the ski widthwise ends in at least one of the ski longitudinally intermediate portion between the ski late ski after ground point sites and Kutsuno portion position The ski according to claim 1, wherein the ski is formed in an arc shape over a desired range of directions . The ski according to claim 2, wherein the recess is formed so that a node of torsional vibration corresponds to a substantially central portion of the recess. 4. The ski according to claim 1, 2 or 3, wherein the bending rigidity of at least one of the shovel portion of the first half of the ski or the tail portion of the second half of the ski is lowered. 5. The ski according to claim 4, wherein a concave portion whose depth changes in a tapered manner toward each contact point is formed in at least one of the shovel portion of the first half of the ski and the tail portion of the second half of the ski. .

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