JP5584864B2 - snow board - Google Patents

Description

  The present invention relates to a snowboard having both operability such as tilting the body and curving on a snow surface and stable slipping.

A snowboard has both feet on a single board, and the direction of the foot and the direction of the body are placed in a direction perpendicular to the longitudinal direction of the snowboard (width direction), making full use of weight movement, etc. Perform operations such as simple rotation and jumping. Hereinafter, when referring to a snowboard, it is simply referred to as a board. The width of the board is wider than the ski, and the warp of the tip is formed in both the front part (nose) and the rear part (tail) so that the board can slide without distinction between forward and backward. Since this snowboard is wide, unintended skidding and skidding are likely to occur, and it is not easy for beginners to control.
In order to smoothly generate a lateral slip during rotational sliding, (a1) the board sliding surface (sole) between the vicinity of the front snow contact (ground contact) point and the vicinity of the rear snow contact (ground contact) point along the width direction. It has been proposed to form a convex curved surface with a smooth continuous curvature (Patent Document 1). According to this shape, since the lateral displacement of the convex curved surface forming portion with respect to the snow surface (ground) during the rotation and sliding is smooth, the balance during the sliding and the improvement of the rotation operability can be obtained. Further, in the same document, (a2) between the front contact point and the shoe placement part, as described above, a convex curved surface is provided with a smooth continuous curvature along the width direction, and the shoe placement part It has been proposed to provide a concave curved surface with a smooth continuous curvature along the width direction between the contact point and the rear contact point. As a result, the lateral displacement with respect to the snow surface can be smoothly performed in front of the shoe placement site, and the rear side is less likely to skid. As a result, it is possible to stabilize the balance during sliding and to improve the rotational operability.
In addition, (b) the snowboard operability is improved by linearly warping the edge of the edge in a predetermined range from the front and back snow contact (ground contact) points to the center, excluding the central area in the longitudinal direction of the board. (Patent Document 2).

JP-A-7-163695 Japanese translation of PCT publication No. 2002-505935

Among the above snowboards, (a1) a snowboard having a convex curved surface formed with a smooth continuous curvature along the width direction of the sole may have good rotational operability, but is insufficient in stability. is there. In addition, the formation of a smooth continuous curvature convex requires high processing accuracy and is difficult to manufacture. In addition, high costs are required for the production of molds and the like. In addition, with respect to (a2), neither the rotational operability nor the stability can be expected to be improved so much, and further high processing accuracy is required, making it difficult to manufacture.
On the other hand, (b) the structure in which the edge portion of the predetermined range from the front contact point to the center and the predetermined range from the rear contact point to the center is bent in a straight line is not so difficult to manufacture, but the edge portion that is bent in a straight line Forms a flat portion at the center of the width and an angular angle that protrudes outward. This angle portion is easy to bite into the snow surface and has a high risk of destabilizing edging.
An object of the present invention is to provide a snowboard in which both operability and stability such as rotation are further improved.

The snowboard of the present invention is a snowboard in which a nose and a tail are kicked, a camber is provided along the longitudinal direction, has a predetermined snow contact length, and side curves are formed on both sides. This snowboard is provided with a convex on the sole surface of the snowboard over the entire length of the snow contact length, and the convex is located at a position directly below the central axis at any position within the snow contact length in the cross section of the snowboard. The one arcuate shape can be approximated by an arc having a radius R , and the convex at the center position of the snow contact length is a convex near the end of the snow contact length. than, loose rather, snowboarding the insert holes for the binding is provided at two positions of the nose side and the tail side, a central loading range is the central part including the insert hole is provided,
{(1) The convex radius of the convex is constant in the central loading range, and in the end side range from the end of the central loading range to the end of the snow contact length on the nose side and tail side. , The radius R is changed from the constant to near the end of the snow contact length, and
(2) In the end side range from the end of the central loading range to the end of the snow contact length on the nose side and tail side, the convex radius is smaller toward the end of the snow contact length. In the central loading range, the radius R is smaller from the central position to the end of the central loading range with a smaller gradient than the change gradient in the end-side range.} It is (1) or (2).
Here, that the convex is loose (or weak or small) means that the edge of the board is not so much raised from the snow surface, and when approximated by an arc, the radius of the arc is large. On the contrary, a strong convex means that the edge is larger from the snow surface than a loose convex, and when approximated by an arc, the radius of the arc is smaller than that of a loose convex.
The arc-shaped form having the lowest point at the position directly below the central axis can be approximated by an arc. The central axis can be substituted by a central plane (width symmetry plane) that passes through the center in the width direction. In this case, “the shape of the circular arc with the position of the center plane (width symmetry plane) as the lowest point” In other words.
With (1) above, the stability at the middle of the board is increased, and at the end of the nose side and tail side, the edge position is made higher from the snow surface toward the front side, so that the inclination when entering rotation is facilitated. Thus, the rotation operability can be further improved.
By (2) above, the edge position is made higher from the snow surface toward the nose side and tail side from the center while obtaining stability in the middle of the board, so that the inclination when entering the rotation is easy Thus, the rotational operability can be further improved.

According to the above configuration, the convex on the end side of the snow contact length (the front side in the longitudinal direction in the range of the snow contact length) is strengthened, and the convex near the center is configured to be loose. In other words, the edge rises higher than the snow surface on the front side (nose side or tail side) of the board, and the edge does not rise so much in the center of the board, and is almost flat. For this reason, at the time of rotation, it is easy to start the operation of tilting the board while bringing the edge into contact with the snow surface from the board front side (front side). For this reason, even if the nose side is set in front and the tail side is set in front, the rotational operability can be improved. Further, since the edge is loose and close to a flat surface at the middle position of the board, the inclination is suppressed to be small, and the stability can be improved. As a result, the rotational operability is ensured by a strong convex on the nose side or tail side, and the stability is secured by a weak convex in the middle of the board. In the prior art, the convex surface of the sole surface was constant. In the present invention, both the rotation operability and the stability can be ensured by the idea of making the convex variable and making it smaller in the middle than the front side of the board.
Also, in the cross section of the snowboard, the convex shape can be approximated by an arc in the arc shape with the position of the center plane (width symmetric plane) of the snowboard as the lowest point. Snowboards can be manufactured.

Extends the effective edge from the end of the snow contact length to the nose side and tail side to a predetermined position, and extends the effective edge, which is the range between the end of the snow contact length and the end position of the effective edge. In the section, it is possible to adopt a configuration in which an upward slope is given from the end of the snow contact length toward the nose side and the tail side. This makes it possible to shorten the snow contact length while securing the necessary effective edge length. At the end of the snow contact length, the board is locally curved, and the substantial rider operation range of the snowboard can be set from the position of the front snow contact point to the position of the rear snow contact point. Substantial rotational operability and stability are ensured by the range of snow contact length between the front and rear curved positions. Since the snow contact length is short, a small turn is effective and the rotation operability is remarkably improved. Moreover, the buoyancy on the front side (front side and rear side) of the board can be increased by adding the effective edge extension portion having an upward slope to the snow contact length. Moreover, a stable straight running at a high speed can be obtained simply by adding an effective edge extension and lengthening the effective edge length. For this reason, in combination with increased buoyancy and significant improvement in rotational operability, for example, it is possible to prevent subsidence on the snow surface of powder snow, for example, to perform high-speed stable sliding and very high-level rotational sliding. .
Here, since the effective edge length is the length that the edge contacts the snow surface during rotation, it can be said to be the length between the front and rear positions where the board width is the widest, and can be adjusted by the method of attaching the side curve.

  The effective edge extension portion can have a sole surface flat, and the flat surface can be inclined upward. As a result, buoyancy increase and stability due to the effective edge extension can be reliably obtained. During rotation, the front edge contacts the snow surface at an early stage (beginning to incline) and receives a reaction force, so that the inclination is supported and stable operability is improved.

The effective edge extension portion can be configured by a flat surface of the sole surface and a curved surface that is curved so as to be continuous along the flat surface along the longitudinal direction without a convex. By this effective edge extension portion, an increase in buoyancy, an improvement in rotational operability and stability can be obtained.

  About the effective edge extension part, the structure which attach | subjects a convex to the sole surface and attaches an upward inclination so that it may continue to the nose or tail to which the kick was attached | subjected can be taken. By this effective edge extending portion with a convex, an increase in buoyancy can be obtained while improving the rotational operability.

  The average upward slope at the effective edge extension can be in the range of 0.3 mm / 10 cm to 3.0 mm / 10 cm. Accordingly, it is possible to obtain appropriate buoyancy and rotational operability on the board front side while obtaining stability.

  The convex at the sole surface of the effective edge extension portion is (1) the same or constant as the convex at the end of the snow contact length, or (2) has a slope that becomes stronger toward the nose side or tail side, or ( 3) It can be configured to have a slope that becomes weaker toward the nose side or tail side. This makes it possible to achieve an appropriate balance between rotational operability and stability according to the rider's preference and ability while obtaining the necessary buoyancy.

  According to the present invention, it is possible to obtain a snowboard in which both operability such as rotation and stability are further improved.

BRIEF DESCRIPTION OF THE DRAWINGS The snowboard in Embodiment 1 of this invention is shown, (a) is a top view, (b) is sectional drawing which follows the IB-IB line (central axis line or center plane). 2 is a cross-sectional view of the snowboard of FIG. 1, (a) is the IIA position (IIA-IIA line), (b) is the IIB position (IIB-IIB line), (c) is the IIC position (IIC-IIC line), (D) is a cross-sectional view at the IID position (IID-IID line), and (e) is a diagram showing the magnitude relationship between the edge height, the convex approximate radius, and the camber in each cross-sectional view. It is a modification of Embodiment 1, and is a top view which shows the snowboard of an example of Embodiment of this invention. The snowboard of Embodiment 2 of this invention is shown, (a) is a top view, (b) is a longitudinal cross-sectional view in alignment with a center plane, (c) is the elements on larger scale of the snow contact point vicinity of (b). FIG. 5 is a cross-sectional view of the snowboard of FIG. 4, where (a) is an IVA position, (b) is an IVB position, (c) is an IVC position, (d) is a cross-sectional view at an IVD position, and (e) is each cross-section. In the figure, it is a figure which shows the magnitude relationship of edge height, a convex approximate radius, and a camber. The snowboard in Embodiment 3 of this invention is shown, (a) is a top view, (b) is sectional drawing in alignment with the central axis of a board, (c) is the part of the nose N side vicinity of the nose N side of (b) It is an enlarged view. 6A shows a cross section at each position, FIG. 6A is a cross-sectional view at the VIIA position in FIG. 6A, FIG. 6B is a cross-sectional view at the VIIB position, and FIG. 6C is a cross-sectional view at the VIIC position. (D) is sectional drawing of a VIID position, (e) is a figure which shows the magnitude relationship of edge height, a convex approximate radius, and a camber in each sectional drawing.

(Embodiment 1)
1A and 1B show a snowboard 10 according to Embodiment 1 of the present invention, in which FIG. 1A is a plan view and FIG. 1B is a cross-sectional view taken along line IB-IB (a central axis or a central axis surface of the board). FIG. 1 (a), (b), the a Seyyukiten _{S 1} of the nose N side, Seyyukicho _{S L} is formed between the Seyyukiten _{S 1} of the tail T side. Since the board 10 slightly sink into the snow, Seyyukiten S _1, if viewed in plan, as shown in FIG. 1, represented by the line (dotted line). Since the rotation operability is greatly affected by Seyyukicho S _L, Seyyukicho S _L is more important than the total length L. The effective edge length, which is the length at which the edge is in contact with the snow surface during rotation, is the distance between the front and rear positions where the board width is the widest, and is thus adjusted by the side curve J. Valid edge length is longer than Seyyukicho S _L. The sole surface are denoted by the convex, the convex, since symmetric with respect to the width center in cross-section, the central axis of the board, through the middle of the Seyyukiten S _1. In Seyyukiten S _1, the board is caused to locally bent in the longitudinal direction, near containing Seyyukiten S ₁ is curved convexly to the lower side (snow side). Moreover, the board of the present invention, since the convex is attached, the lowest point in Seyyukiten S ₁ (black circles), as shown in FIG. 1 (a), situated on the central axis of the board ing.
Along Seyyukicho S _L, camber is provided is curved to be convex from the snow upwardly. The camber v is defined on the central axis or the central plane. From Seyyukiten S ₁ of the front side, the nose N and the tail T is up warped from the snow surface kick is assigned. The snow contact length S _L is important and repeats, but when the snowboard is placed on a hard flat surface (not snow surface) free of load, the lowest point (black circle) that touches the flat surface is is the distance between lines (or Seyyukiten) S ₁ in the width direction including.
About six insert holes H in which shoes (boots) are bound are provided at two locations on the front side and the rear side. The insert holes H can be changed in a range of several to a dozen or so depending on the length of the board, and are not limited to six on one side as shown in the figure. The rider puts the boot along the width direction of the board, so that the front of the body faces the width direction. It will be called the board central region including an insert hole H and the central loading range K _L. The front side of the range of the central loading range K _L, i.e. referred to as end side range Q _L ranges between the central loading range K _L and Seyyukiten S _1. These central loading range K _L and the end-side range Q _L, and displays a longitudinal length of these ranges with the same symbol K _L and Q _L. The snowboard 10 is symmetric with respect to the central axis or the center plane in the width direction, but there are cases where the longitudinal direction is symmetric with respect to the central position (twin chip) and cases where it is asymmetrical (directional shape). The difference between the directional chip and the twin chip is the same as that of the twin chip, except that the position of the insert hole H is shifted to the rear side. Although the present invention can be applied to any case, in this embodiment, a case of a twin chip will be described.

2 shows a cross section at each position of the snowboard 10. In FIG. 1A, (a) is the IIA position, (b) is the IIB position, (c) is the IIC position, (d) is the IID position, FIG. 2A, the side curve J is shallow, so the board width is the largest, the convex is the strongest (the approximate radius _Ra is the smallest), and the edge height _ha is the largest. and camber _{v a} is the smallest. When the intersection (intersection line) C between the center plane (width symmetry plane) and the board is defined, the edge height is defined by the height of the edge E from the intersection C.
In the IIB position that belongs to the same end side range Q _L as the IIA position and is closer to the center than the IIA position, the convex is looser than the IIA position (the approximate radius R _b is larger than _Ra ), and the edge height h _b is a little. becomes smaller, the camber _{v b} is slightly larger. Two positions IIC in the central loading range _{K L,} in the IID, convex is the same intensity (the same approximate radius _R c = _{R d),} at approximately the same and the edge height _{h c} and _{h d,} small . FIG. 2E shows the magnitude relationship between the edge height h, the approximate radius R, and the camber v at each of the above positions.

Edge height _{h a} in the position of the contact snow length of the end of the is about 0.7 mm, the edge of the central loading range height _h c, _{h d} are both 0.3mm approximately. Edge height h _b of the intermediate position of the end-side range Q _L is the height of the intermediate. The strength of these convexes, or the edge height h corresponding to the convex strength, can be further increased by the progress of manufacturing technology and the technology of lidar. For example, the maximum edge height in this embodiment h _a 0.7 mm are likely to increase to about 1.5 mm, also the minimum edge height of 0.3mm in the central loading range _{K L} is likely reduced to approximately 0.1mm reversed. Since the edge height h may be called the strength of the convex itself, it may be called the convex h in this description.
Since the edge height h is relatively small, it is necessary to pay sufficient attention to the measurement. For the measurement, an alloy block gauge having a low coefficient of thermal expansion is used, and the center of the width of the sole surface of the board is applied to the plane of the block gauge so that the height of the edges is symmetrical. After the board is aligned with the block gauge, the lighting fixture is arranged so that the lighting near the measurement position or in the room is turned off and light passes through the edge height of the sole surface. In such a state, the edge height h is preferably measured with a caliper or a micrometer.
In manufacturing, the edge height h causes a large error of several tens of percent.

As shown in FIG. 2, the snowboard according to the present embodiment, the edge E at an end side range Q _L of the front side of the board is in the most raised position from the height position of the intersection point C of the central plane, a central loading The side curve may come deeper as the range is approached, and the edge takes a height close to the height of the intersection C. For this reason, the operation of tilting the board and rotating the edge E against the snow surface from the front side of the board can be smoothly performed. That is, the operability of rotation can be improved. However, the central loading range K _L, convex is made smaller than the end side range Q _L, it is constant. Therefore, the central loading range K _L load is applied, stable gliding against the relatively evenly snow in the width direction. That is, stability is increased. Both the rotational operability and the stability can be improved by a convex curve with a stronger slope at the end in the end range and a constant convex weaker than that in the central load range.

(Modification of Embodiment 1)
FIG. 3 is a modification of the first embodiment and is an example of the embodiment of the present invention. In this modification, as shown in FIG. 3, a very small convex (h = about 0.05 mm) at the center of the central loading range _{K L} have been assigned, Convex is h = 0.05 mm of the center position Increases with a small gradient from h to 0.3 mm at the boundary with the end range Q _L. The slope of this convex increase, than the gradient of the convex increasing in the end side area Q _L, rather small. Within the end side range Q _L , as in the first embodiment, it increases with a large gradient from about h = 0.3 mm to about h = 07 mm.
In this modified example, the central position is gradually increased from h = 0.05 mm, at which there is almost no convex, to reach 0.3 mm by gradually increasing h toward the boundary. The shape of the convex in the end side region Q _L increases from h = 0.3 mm on the center side to 0.7 mm on the nose N side or the tail T side, as in the first embodiment. Therefore, in the near center Saini range flat, it is possible to ensure stability, the front side of the end side range Q _L, because it has a large convex, it is possible to improve the rotational operation and the like.

(Embodiment 2)
4A and 4B show a snowboard 10 according to Embodiment 2 of the present invention, where FIG. 4A is a plan view, FIG. 4B is a cross-sectional view taken along the center axis of the board, and FIG. 4C is a contact on the nose N side of FIG. It is the elements on larger scale near a snow spot. In FIG. 4 (a), (b) , and Seyyukiten _{S 1} of the nose N side, Seyyukicho _{S L} is formed between the Seyyukiten _{S 1} of the tail T side. The feature of the snowboard 10 of the present embodiment is that the effective edge length S _E , which is the length of the edge E contacting the snow surface by tilting the board during rotation, is about 10 cm longer than the snow contact length S _L. It is in. The effective edge length S _E is defined as the distance S _E between the effective edge end point P _S on the tail T side and the nose side at the edge E of the board. Therefore, by adjusting the side curve J, the position P _S of the maximum width of the board than Seyyukiten S _1, (or several cm~ ten cm approximately) 10 cm approximately, the nose side and located in the tail Let As a result, between the Seyyukiten S ₁ and the nose N of the nose side, and between the Seyyukiten S ₁ and tail T of the tail, the effective edge extension F are formed. In the present embodiment, the effective edge extension F is provided with a convex. In Figure 4 is a longitudinal sectional view (b), on a central plane, the effective edge end point P _S is the position of the maximum width of the board is shown. For even effective edge end point P _S, the position of the line along the width direction including the P _S (dotted line).

In the effective edge extension F, an ascending slope is given from the snow contact point S ₁ to the nose N side or the tail T side. In FIG.4 (c), (g / f) which is an ascending slope is good to set it as the grade of (0.3 mm / 10cm)-(3mm / 10cm). That is, it is preferable to set the gradient so as to rise from the snow surface by about 0.3 mm to 3 mm per 10 cm of the length of the effective edge extension F. If the length of the effective edge extension F is 10 cm, the center position of the width corresponding to the end point P _s on the nose side and the tail side is positioned 0.3 mm to 3 mm higher than the snow contact point S ₁ . The load when the rider rides in the curved portion near Seyyukiten S _1, point contact with the snow surface is due to the center side. Therefore, P _s the position of the active edge extensions F by the load of the rider, further increases from a little snow. The _{P s} corresponding positions, the extent to which further increases the bit snow (lift height) is about 0.5 mm to 2 mm. Such lifting is of P _s position by a load, the period from the effective edge extension F from the nose and tail of the board on the edge side range Q _L, resulting in a greater buoyancy improved.

Convex is attached to the sole surface of the effective edge extension F together with an upward slope. FIG. 5 is a diagram showing a cross section at each position in FIG. 5A is a sectional view at the VA position in FIG. 4A, FIG. 5B is a sectional view at the VB position, FIG. 5C is a sectional view at the VC position, and FIG. 5D is a sectional view at the VD position. . In this embodiment, a convex in the vicinity of Seyyukiten S ₁ by strongly up, the convex at the effective edge growth portion F, are weaker front side. The edge heights h _a , h _b , h _c , and _hd are set according to the strength of the convex.
In Seyyukiten S _1, bent locally convexly curved snow surface. Making the effective edge length S _E longer than Seyyukicho S _L is also to shorten the Seyyukicho S _L reversed. Only to shorten the Seyyukicho S _L of the board, maneuverability is likely very rotates now hear. Furthermore, by making the effective edge extension F ascending to (1) the tail side or the nose side, a large lifting force, that is, buoyancy can be obtained. Effective in preventing sinking on snow surfaces such as powder snow. In addition, (2) by increasing the convex near the snow contact point and weakening the convex toward the front side in the effective edge extension F, the stability in the rotational operation while maintaining good rotational operability, A relatively large buoyancy can be ensured. In the central loading range K _L, as in the first embodiment, the weak constant convex, but this can be obtained stability.

(Modification of Embodiment 2)
In the second embodiment, the convex in the effective edge extension F is weaker toward the front side. Although illustration is omitted, in the following modified example, the strength of the convex in the effective edge extension F is changed.
(Modification 1): In Modification 1 of Embodiment 2, the convex becomes stronger toward the front side of the effective edge extension F. Thereby, the convex is strengthened toward the front side under the condition of a short snow contact length S _L while obtaining buoyancy, so that a very developed and extremely high rotational operability can be obtained. For this reason, it is effective for a rider who has acquired high skill when performing a special run for competition or performance.
(Modification 2): In Modification 2 of Embodiment 2, in the effective edge extension F, the convex is constant and is equivalent to the convex at the snow contact point S ₁ . While providing buoyancy, a short contact Yukicho S _L, is constant convex. For this reason, a certain degree of stability and a very developed rotational operability can be obtained.

(Embodiment 3)
6A and 6B show a snowboard 10 according to Embodiment 3 of the present invention, where FIG. 6A is a plan view, FIG. 6B is a cross-sectional view taken along the center axis of the board, and FIG. 6C is a contact on the nose N side of FIG. It is the elements on larger scale near a snow spot. In FIG. 4 (a), (b) , and Seyyukiten _{S 1} of the nose N side, Seyyukicho _{S L} is formed between the Seyyukiten _{S 1} of the tail T side. The feature of the snowboard 10 of the present embodiment is that the effective edge extension portion _FL is flattened in the snowboard 10 of the second embodiment. In flat valid edge extensions F _L, from Seyyukiten S _1, upslope is attached to the nose N side or tail T side. In FIG. 6C, the upward gradient (g / f _L ) is preferably in the range of (0.3 mm / 10 cm) to (3 mm / 10 cm). That, per 10cm length of the flat valid edge extensions _{F L,} about 0.3 mm to 3 mm, preferably set to slope to rise in the snow. When the length of the flat valid edge extensions _{F L} and 10 cm, width central position in the valid edge end point _{P s} of the nose side and the tail side, located 0.3mm~3mm higher position than Seyyukiten _{S 1} . The load when the rider rides in the curved portion near Seyyukiten S _1, point contact with the snow surface is due to the center side. Therefore, P _s the position of the flat valid edge extensions F _L by the load of the rider is further increased from slightly snow. The _{P s} position is the extent to which further increases the bit snow, i.e. the lifting height is about 0.5 mm to 2 mm. Such lifting is of P _s position by a load over the nose and tail of the board on the edge side range Q _L from a flat active edge extensions F _L, resulting in a greater buoyancy improved.

The flat surface of the flat valid edge extensions F _L, upslope is attached. FIG. 7 is a diagram showing a cross section at each position in FIG. 7A is a sectional view at the VIIA position in FIG. 6A, FIG. 7B is a sectional view at the VIIB position, FIG. 7C is a sectional view at the VIIC position, and FIG. 7D is a sectional view at the VIID position. . In this embodiment, a convex in the vicinity of Seyyukiten S ₁ strongly to the maximum, and the convex of the flat active edge extensions F _L to zero (a corollary of that is flat). The edge heights h _a , h _b , h _c , and _hd are set according to the strength of the convex.
To become shorter Seyyukicho S _L of the board, maneuverability is likely very rotates now hear. Furthermore, a large lifting force, that is, buoyancy can be obtained by making the flat effective edge extension portion FL _ascend to (1) the tail side or the nose side. Effective in preventing sinking on snow surfaces such as powder snow. Further, in the maximum near Seyyuki point (2) convex, in a flat effective edge extensions F _L, because convex is zero, while maintaining good rotational operability, and stability in rotation operation, relatively Large buoyancy can be secured. In the central loading range K _L, as in the first embodiment, the weak constant convex, but this can be obtained stability.

(Other embodiments)
In the first to third embodiments and the modifications, only the example of the twin chip has been described, but the present invention can also be applied to the case of a directional shape and a directional twin that are not symmetrical in the longitudinal direction. In any description of the invention (claims), a nose and a tail are specified, and the terms of the nose and the tail refer to corresponding portions of twin tip, directional shape, and directional twin.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  According to the present invention, a balance between operability and stability can be realized at a higher level. As for the processing accuracy, a corresponding accuracy is required, but an extremely high level of accuracy is unnecessary, and it can be applied to general products for general purposes.

10 Snowboard, C Intersection (intersection point) between center plane and board, E edge, F effective edge extension, _FL flat effective edge extension, f effective edge extension, f _L flat effective edge extension , g active edge extension up allowance, h edge height, H insert hole, J side curve, _{K L} a central loading range, L total length, N nose, _{P S} valid edge end points, _{Q L} end range, R convex approximation radius, _{S 1} Seyyukiten, _{S E} valid edge range, _{S L} Seyyukicho, T tail, v camber.

Claims (7)

A snowboard with a kick attached to the nose and tail, a camber along the longitudinal direction, a predetermined snow contact length, and side curves formed on both sides,
Convex is attached to the sole surface of the snowboard over the entire length of the snow contact length,
The convex has a single arc shape with the lowest point at a position directly below the central axis at any position within the snow contact length in the cross section of the snowboard, and the single arc shape has a radius R. can be approximated by an arc having, and convex at the center position of the contact Yukicho is than convex in the vicinity of the end of the contact Yukicho, rather slow,
The snowboard is provided with an insert hole for binding at two locations on the nose side and the tail side, and is provided with a central loading range that is a central portion including the insert hole,
{(1) The convex radius of the convex is constant in the central loading range, and in the end side range from the end of the central loading range to the end of the snow contact length on the nose side and tail side. , The radius R is changed from the constant to near the end of the snow contact length, and
(2) In the end side range from the end of the central loading range to the end of the snow contact length on the nose side and tail side, the convex radius is smaller toward the end of the snow contact length. In the central loading range, the radius R is smaller from the central position to the end of the central loading range with a smaller gradient than the change gradient in the end-side range.} A snowboard, characterized by being (1) or (2) . The effective edge is extended from the position of the end of the snow contact length to the nose side and the tail side to a predetermined position, and is in a range between the position of the end of the snow contact length and the end position of the effective edge. 2. The snowboard according to claim 1, wherein an upward slope is given from an end of the snow contact length to the nose side and the tail side in an edge extension portion. The snowboard according to claim 2 , wherein the effective edge extension portion has a flat sole surface, and an upward slope is attached to the flat surface. The effective edge extending portion is configured such that a sole surface thereof includes a flat surface and a curved surface that is curved so as to be continuous along the flat surface along the longitudinal direction without a convex. The snowboard according to claim 2 . The effective edge extensions, convex is attached at its sole surface, so as to be continuous to the nose or tail the kick is attached, characterized in that the up-ramp is attached, to claim 2 The listed snowboard. The snowboard according to any one of claims 2 to 5 , wherein an average upward inclination in the effective edge extension portion is in a range of 0.3 mm / 10 cm to 3.0 mm / 10 cm. The convex on the sole surface of the effective edge extension portion is (1) the same or constant as the convex at the end of the snow contact length, or (2) has a gradient that becomes stronger toward the nose side or tail side, Or (3) The snowboard according to claim 5 or 6 , wherein the snowboard has a slope that becomes weaker toward a nose side or a tail side.

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