Patent Publication Number: US-6663137-B2

Title: Snowboard

Description:
The invention relates to a snowboard, consisting of a board on which two bindings are mounted on the surface of the board, at a distance apart approximately corresponding to ⅓ of the board&#39;s length. The board is designed with inwardly curving edge portions, the board having a greater width at both ends at the transition to the tips, and with a minimum width of 18 cm in the middle. The board has upturned tips, possibly with a slightly more moderate tip at one end. 
     BACKGROUND 
     At present snowboards are normally designed with a flat sole surface between the tips at both ends. For steering the board is edged and the weight distributed between the feet in the two bindings. 
     Alpine skiing is a field which is related to snowboarding. In Alpine pair skis it is known to have the sole surfaces designed with angled portions in partial areas of the sole surface. 
     Thus in Norwegian patent no. 172 170 there is disclosed an Alpine ski, of a pair of skis, which on a maximum 20 cm long front portion has a gliding surface which diverges upwards when the steel edge diverges outwards from the ski&#39;s longitudinal axis. The object of this ski is to turn with the least possible loss of kinetic energy. In patent no. PCT/NO95/00030 there is disclosed an Alpine ski, which on a portion which is longer than 20 cm has a gliding surface which diverges upwards when the steel edge diverges outwards from the ski&#39;s longitudinal axis. The object of this ski is to turn with the least possible loss of kinetic energy, but in this case with a more harmonious design than in that which is described in Norwegian patent no. 172 170. 
     In Norwegian patent no. 301 964, which corresponds to EP 748245 there is disclosed an Alpine pair ski with a flat first sliding surface and lateral surfaces provided with an almost continuous concave inward curve between a first transition line which defines the transition from a tip portion to a front portion and a second transition line which defines the transition from the main portion to a rear portion. The lower lateral edge between the transition lines describes an almost continuous curve. The sole on both sides of the first sliding surface comprises further sliding surfaces, which extend upwards from the edge of the first sliding surface to the lower lateral edges of the ski with an upward curve. The additional sliding surfaces extend in the longitudinal direction of the ski, at least from the first and second transition lines respectively towards a transverse line behind the middle of the ski and in the portion of the ski where the binding is attached, the width of the ski at the transverse line being equal to the least width of the ski between the transition lines. The upward curve in the lower lateral edge on the additional sliding surfaces increases substantially with the ski&#39;s increasing width in the direction of the two transition lines. 
     An Alpine ski as described in this publication has been shown to be very well suited to Alpine events and the angled sliding surfaces, which even with a relatively slight edging of the ski can be pressed into contact with the base, giving improved turning technique and grip on the base. 
     The present invention is based on the development of Alpine skis which is described in Norwegian patent no. 301964. Even though both skis and snowboards are used for downhill skiing and turning in Alpine terrain, there are nevertheless significant differences. This difference is based both on the difference in design of the two products and on the manner in which the product maneuvers. In skis the weight is distributed with a foot in a binding in the central portion of each ski and the ski, which is elongated and relatively narrow, at least for most of its length, will, when a pressure load is applied in the central area, be able to be forced to assume different positions against the base. In the case of a snowboard the performer stands with both feet on a substantially wider board and he will steer the board by bodily movements and by distributing his weight between the front and the rear of the board. Since the board is wider and shorter and the weight distribution different the board will not only be more rigid than a ski but will also be steered in a different way. 
     SUMMARY 
     In the present invention it has been found that a number of the principles which have been developed in connection with the ski according to Norwegian patent no. 301964 in modified and developed form can be employed for further development of a snowboard, resulting in a marked improvement in their handling characteristics. 
     On this basis, therefore, it is the object of the invention to provide an improved snowboard. This is achieved by means of a snowboard which is characterized by the features which will be presented in the patent claims. 
     The snowboard according to the present invention differs from the above-mentioned, known ski designs in the requirement, amongst other things, that the secondary lateral areas of the board should be substantially tapered. By being tapered it should be understood that the angle of the lateral area against the base, viewed in the transverse direction of the board, increases from the central portion up to the front area at the tips. 
     From the dynamic point of view a snowboard differs from a ski in many ways, for reasons of both design and mode of application, as indicated above. A ski with a certain inward curve will be twisted upwards at the tip and rear tip when edged, since the skier presses with his foot in the middle of the ski and the counter-forces from the base will twist the ski, reducing the aggressiveness at the front and the rear due to the fact that the sole is flatter against the snow at the front and the rear than in the middle. In contrast with this the performer on a snowboard will stand with both feet placed not so far from the tips, with the result that in relative and absolute terms the snowboard has less length than the ski to generate a twisting moment. It will therefore not be so easy to twist the snowboard. It is therefore absolutely necessary to give the snowboard a dynamically correct shape at the manufacturing stage. This is achieved according to the invention by combining dimensions which are specific to the snowboard with selected features which are known to be employed in connection with skis, since these selected features together will give the snowboard an optimal dynamic adaptation. Thus it is the combination of the features indicated in the patent claims which make it possible to utilise the features known from skis for an improvement of an alternative product, viz. a snowboard. 
     There is therefore a fundamental difference between ski and board, and in the invention it has surprisingly been shown that by means of adaptation and modification of features known from the field of skis with regard to the design of twisted surfaces, it has been possible to develop a snowboard which is adapted to the dynamics which apply to skis. 
     When the tapered board according to the invention is placed on the snow, it can already have a better dynamic shape than the surface the board is capable of achieving, since the board according to the invention is produced with a twisting tapering of the sole adapted to where the weight is actually paced on the board, with regard to the ideal twisting tapering which is desired. 
     It has further been shown that there are significant safety aspects associated with a specific design of raised sliding surfaces with regard to landing after jumping with the snowboard. It is a fact that falls with snowboards result in many injuries, which are far more serious than the speed would indicate. The snowboard according to the present invention is also designed to increase safety in landing after a jump, due to the fact that it is not so aggressive in the edge area during landing. 
     The more curved the steel edge in the snowboard&#39;s edge area is, the greater tendency it has to cut away in an uncontrolled fashion when landing after a jump, especially when making an almost flat landing. The invention will therefore provide greater safety benefits the more inward curve the snowboard has. By allowing the board to be almost flat along its entire width from the central portion a reasonable edge grip can also be secured when the board is flat against the snow. On the front and rear portions of the board the right and left parts of the sole are tapered upwards, thus providing a less aggressive steel edge, but at the same time the board has to be formed in such a manner that it has a good edge grip when turning. Thus a boat shape, in which the cross section shows curved lines near the steel edge will be unsuitable, since the angle at the steel edge will then be too large to give a good edge grip. The snowboard described with a cross section in the front and rear portions consisting of three straight lines (FIG. 2) will ensure both a less aggressive edge grip during landing after a jump and adequate edge rip during turning. 
     The width is a further significant difference between ski and snowboard. A narrow ski can easily be edged 45°. The much wider snowboard is usually run much flatter than a ski. A great deal of edge grip will therefore easily be lost with a snowboard when the secondary surfaces are too acutely angled relative to the first sole surface. The invention solves this special problem for snowboards by means of the special design of raised lateral area from the following criteria: 
     1. The secondary lateral area must have a certain minimum width which is greater than for most skis, thus achieving a greater uplift with less angling of the secondary lateral area relative to the first sole surface. 
     2. The secondary lateral area is raised from the plane of the main area by being tapered upwards when moving from the middle towards the tips. 
     3. The cross section shows the sole as three substantially straight lines in those parts of the board where there are secondary lateral areas. 
    
    
     DESCRIPTION OF THE DRAWINGS 
     The invention will now be illustrated in more detail by means of the embodiments which are presented in the drawings, in which: 
     FIG. 1 illustrates the underside of a snowboard according to the invention, 
     FIG. 2 is a cross section of the snowboard in FIG. 1, viewed across the board in the areas indicated by A, B C, 
     FIG. 3 is a variant of the embodiment in FIG. 1, 
     FIG. 4 is a further variant of the invention, 
     FIG. 5 is a variant of the embodiment in FIG. 1, 
     FIG. 6 is a variant of the embodiment in FIG. 5, 
     FIG. 7 is a further variant of the invention, 
     FIG. 8 is a further variant of the invention, 
     FIGS. 9 and 10 illustrate the snowboard according to the invention, viewed from the side and from one end; and 
     FIG. 11 is a further variant of the invention. 
    
    
     DETAILED DESCRIPTION 
     FIG. 1 illustrates the underside of a snowboard. The hatched gliding surface  1 , called the main area, is completely flat when the board is pressed against a flat base. The secondary lateral areas  2   a  and  2   b  in line  5   a — 5   b  are level with the main area, and up to line  4   a — 4   b  form a substantially increasing angle with the main area, viewed in cross section as shown in FIG.  2 . In the same way the secondary lateral areas  2   c  and  2   d  in line  7   a — 7   b  are level with the main area, and up to line  8   a — 8   b  form a substantially increasing angle with the main area. The secondary lateral areas  2   a ,  2   b ,  2   c , and  2   d  therefore appear to be twisted tapered, if not over the entire length, to such an extent that they have the function of a tapered surface. The front tip  3   a  and rear tip  3   b  and central transversal axis  6   l - 6   b  are also shown. 
     FIG. 2 illustrates three cross sections of the snowboard in FIG. 1, taken directly across from FIG.  1 . In order to illustrate the increasing angle from line  5   a - 5   b  to line  4   a - 4   b  the angles are slightly exaggerated, thus making it easy to see that there is a larger angle nearest line  4   a - 4   b.  In cross section the sole surfaces are shown to be completely straight, even though in the transition between first sole surface and the secondary lateral areas there may be a certain degree of rounding. 
     FIG. 3 illustrates a design in which the secondary lateral areas are terminated reasonably parallel to the steel edge. 
     FIG. 4 illustrates a design in which the secondary lateral areas are widest at the transition to the tips at lines  4   a - 4   b  and  8   a - 8   b  respectively, gradually narrowing as one approaches lines  5   a — 5   b  and  7   a - 7   b  respectively. In this embodiment the degree to tapering will be less than in the other embodiments which are illustrated. 
     FIG. 5 illustrates approximately the same design as FIG.  1 . Here the board is envisaged moving straight ahead with the board completely flat against a hard base. Only the steel edges outside the main area plane  1  are then in contact with the snow, while the performer&#39;s weight is envisaged evenly distributed over the entire length of the main area plane. As an illustration we have chosen to let the central portion of the snowboard be the same length as the sum of he length of the secondary lateral areas on the same side. Thus the lengths  4   a - 5   a  and  7   a - 8   a  are here equal to  5   a - 7   a , and correspondingly on the opposite side. Using the equation where torque (M)=force (F)×distance (d). F/2 is the force from the base on the steel edge over half the lengths of the board, while d/2 is the average distance from the center  6  of the performer to the force&#39;s point of attach on one side. M indicates torque. 
     FIG. 6 illustrates the same design as FIG. 5, but with a completely flat sole. F is the force from the base on the steel edge along the entire length of the board, while d is the average distance from the centre  6  of the performer to the force&#39;s point of attack on one side. M indicates torque. 
     FIGS. 7 and 8 illustrate two further examples of snowboards designed according to the invention. In the embodiment according to FIG. 7 the hatched sole surface, i.e. the main area is designed with equal, relatively narrow width along the whole board, but ahs a central portion at line  6 — 6  which makes a “soft” transition into the lateral areas. A certain degree of asymmetry in the secondary areas in indicated, even though symmetry is preferred. In the embodiment in FIG. 8 the hatched main area surface is designed narrowing from line  6 — 6  to end lines  4 — 4  and  8 — 8 , which is first illustrated from lines  5 — 5  and  7 — 7 . The portion of the main area surface between these two lines is continued right out to the edge. In all embodiments the lateral areas are designed in a tapered form. 
     The illustrated examples will provide boards which have different handling characteristics, but will all provide the special advantage which is achieved by means of the invention. 
     Finally, FIGS. 9 and 10 illustrate the snowboard according to the invention, viewed from the side and from one of the ends. On this scale the angles had to be exaggerated relative to the preferred angle in order to clearly illustrate the principle. In FIG. 10 the tapering of the lateral areas can be seen indicated on the underside, with the maximum angle in the transition to the tip. Also shown are two bindings 10 mounted on the board&#39;s upper surface at a distance apart corresponding to approximately ⅓ of the board&#39;s length. 
     Four tables are now presented illustrating the tapering angle for the lateral areas in the snowboard according to the invention. Thus table 1 gives four examples of snowboards with a constant cross section for the first sole surface. Table 2 exemplifies an embodiment with constant width for the secondary lateral areas, while table 3 gives the angle for boards with variable with for the first sole surface in the secondary lateral areas. Table 4 and FIG. 11 illustrates examples of asymmetrical snowboards. 
     It should be obvious from the above that despite the choice and combination of special features which are partly known from ski technology, many modifications are possible. Further development according to the invention is based on the combination of selected features in such a manner that a result is obtained which is unique for snowboards. In the invention a selection of features and dimensions have been made which together provide an improvement. 
     
       
         
           
               
             
               
                 TABLE 1 
               
             
            
               
                   
               
               
                 Four examples of a snowboard with a constant width of the first base surface. For simplicity we use in these 
               
               
                 examples snowboards with circular sidecut. and symmetry along both the longitudinal and transversal central axis. 
               
            
           
           
               
               
               
               
               
               
            
               
                   
                   
                   
                 Length (6)-(4) 
                 Sidecut radius 
                   
               
               
                   
                   
                 Length (6)-(8) 
                 (mm) 
                 (mm) 
                   
               
               
                 Total width at (8) 
                 Total width at (6) 
                 (mm) 
                 650 
                 10,573 
                   
               
            
           
           
               
               
               
               
               
            
               
                 (mm) 
                 (mm) 
                 650 
                 Cross sectional angle between 
                   
               
               
                 290 
                 250 
                 Width of each 
                 main area and secondary lateral areas 
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 Distance 
                   
                 Width of the 
                 secondary 
                 (degrees) 
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 from the tip 
                 Total width 
                 main area 
                 lateral area 
                 Example 
                 Example 
                 Example 
                 Example 
               
               
                 (mm) 
                 (mm) 
                 (mm) 
                 (mm) 
                 1 
                 2 
                 3 
                 4 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                   
                   
                   
                   
                   
                   
                   
               
               
                 50 
               
               
                 100 
               
               
                 150 
                 290.0 
                 80.0 
                 105.0 
                 3.0 
                 1.0 
                 2.0 
                 2.2 
               
               
                 200 
                 284.1 
                 80.0 
                 102.0 
                 2.7 
                 0.7 
                 1.9 
                 2.2 
               
               
                 250 
                 278.6 
                 80.0 
                 99.3 
                 2.4 
                 0.3 
                 1.8 
                 2.1 
               
               
                 300 
                 273.7 
                 80.0 
                 96.8 
                 2.1 
                 0 
                 1.7 
                 2 
               
               
                 350 
                 269.2 
                 80.0 
                 94.6 
                 1.8 
                 0 
                 1.6 
                 1.8 
               
               
                 400 
                 265.1 
                 80.0 
                 92.6 
                 1.5 
                 0 
                 1.5 
                 1.6 
               
               
                 450 
                 261.6 
                 80.0 
                 90.8 
                 1.2 
                 0 
                 1.4 
                 1.4 
               
               
                 500 
                 258.5 
                 80.0 
                 89.3 
                 0.9 
                 0 
                 1.2 
                 1.2 
               
               
                 550 
                 255.9 
                 80.0 
                 88.0 
                 0.6 
                 0 
                 0.9 
                 1 
               
               
                 600 
                 253.8 
                 80.0 
                 86.9 
                 0.3 
                 0 
                 0.6 
                 0.8 
               
               
                 650 
                 252.1 
                 80.0 
                 86.1 
                 0 
                 0 
                 0.3 
                 0.6 
               
               
                 700 
                 250.9 
                 80.0 
                 85.5 
                 0 
                 0 
                 0 
                 0.4 
               
               
                 750 
                 250.2 
                 80.0 
                 85.1 
                 0 
                 0 
                 0 
                 0.2 
               
               
                 800 
                 250.0 
                 80.0 
                 85.0 
                 0 
                 0 
                 0 
                 0 
               
               
                 850 
                 250.2 
                 80.0 
                 85.1 
                 0 
                 0 
                 0 
                 0.2 
               
               
                 900 
                 250.9 
                 80.0 
                 85.5 
                 0 
                 0 
                 0 
                 0.4 
               
               
                 950 
                 252.1 
                 80.0 
                 86.1 
                 0 
                 0 
                 0.3 
                 0.6 
               
               
                 1000 
                 253.8 
                 80.0 
                 86.9 
                 0.3 
                 0 
                 0.6 
                 0.8 
               
               
                 1050 
                 255.9 
                 80.0 
                 88.0 
                 0.6 
                 0 
                 0.9 
                 1.0 
               
               
                 1100 
                 258.5 
                 80.0 
                 89.3 
                 0.9 
                 0 
                 1.2 
                 1.2 
               
               
                 1150 
                 261.6 
                 80.0 
                 90.8 
                 1.2 
                 0 
                 1.4 
                 1.4 
               
               
                 1200 
                 265.1 
                 80.0 
                 92.6 
                 1.5 
                 0 
                 1.5 
                 1.6 
               
               
                 1250 
                 269.2 
                 80.0 
                 94.6 
                 1.8 
                 0 
                 1.6 
                 1.8 
               
               
                 1300 
                 273.7 
                 80.0 
                 96.8 
                 2.1 
                 0 
                 1.7 
                 2.0 
               
               
                 1350 
                 278.6 
                 80.0 
                 99.3 
                 2.4 
                 0.3 
                 1.8 
                 2.0 
               
               
                 1400 
                 284.1 
                 80.0 
                 102.0 
                 2.7 
                 0.7 
                 1.9 
                 2.1 
               
               
                 1450 
                 290.0 
                 80.0 
                 105.0 
                 3.0 
                 1.0 
                 2.0 
                 2.1 
               
               
                 1500 
               
               
                 1550 
               
               
                 1600 
               
               
                   
               
               
                 Where the angle between the secondary lateral area and the main area is zero, the main area extends to the steel edge, and the “Width of the main area” equals the “Total Width.” The secondary lateral area is not lateral in this part, and the width of the secondary lateral area is shown because it varies from example to example. Where the angles is zero, the width of the secondary lateral area is also zero.  
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 2 
               
             
            
               
                   
               
               
                 Four examples of a snowboard with a constant width of the first base surface. For simplicity we use in these 
               
               
                 examples snowboards with circular sidecut. and symmetry along both the longitudinal and transversal central axis. 
               
            
           
           
               
               
               
               
               
               
            
               
                   
                   
                   
                 Length (6)-(4) 
                 Sidecut radius 
                   
               
               
                   
                   
                 Length (6)-(8) 
                 (mm) 
                 (mm) 
                   
               
               
                 Total width at (8) 
                 Total width at (6) 
                 (mm) 
                 650 
                 9,400 
                   
               
            
           
           
               
               
               
               
               
            
               
                 (mm) 
                 (mm) 
                 650 
                 Cross sectional angle between 
                   
               
               
                 290 
                 245 
                 Width of each 
                 main area and secondary lateral areas 
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 Distance 
                   
                 Width of the 
                 secondary 
                 (degrees) 
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 from the tip 
                 Total width 
                 main area 
                 lateral area 
                 Example 
                 Example 
                 Example 
                 Example 
               
               
                 (mm) 
                 (mm) 
                 (mm) 
                 (mm) 
                 5 
                 6 
                 7 
                 8 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                   
                   
                   
                   
                   
                   
                   
               
               
                 50 
               
               
                 100 
               
               
                 150 
                 290.0 
                 140.0 
                 75.0 
                 3.5 
                 1.0 
                 2.0 
                 3 
               
               
                 200 
                 283.3 
                 133.3 
                 75.0 
                 3.1 
                 0.8 
                 1.9 
                 2.7 
               
               
                 250 
                 277.2 
                 127.2 
                 75.0 
                 2.7 
                 0.6 
                 1.8 
                 2.4 
               
               
                 300 
                 271.6 
                 121.6 
                 75.0 
                 2.3 
                 0.4 
                 1.7 
                 2.1 
               
               
                 350 
                 266.6 
                 116.6 
                 75.0 
                 1.9 
                 0.2 
                 1.6 
                 1.8 
               
               
                 400 
                 262.0 
                 112.0 
                 75.0 
                 1.6 
                 0 
                 1.5 
                 1.6 
               
               
                 450 
                 258.0 
                 108.0 
                 75.0 
                 1.3 
                 0 
                 1.4 
                 1.4 
               
               
                 500 
                 254.6 
                 104.6 
                 75.0 
                 1.0 
                 0 
                 1.2 
                 1.2 
               
               
                 550 
                 251.7 
                 101.7 
                 75.0 
                 0.7 
                 0 
                 0.9 
                 1 
               
               
                 600 
                 249.3 
                 99.3 
                 75.0 
                 0.4 
                 0 
                 0.6 
                 0.8 
               
               
                 650 
                 247.4 
                 97.4 
                 75.0 
                 0.2 
                 0 
                 0.3 
                 0.6 
               
               
                 700 
                 246.1 
                 96.1 
                 75.0 
                 0 
                 0 
                 0 
                 0.4 
               
               
                 750 
                 245.3 
                 95.3 
                 75.0 
                 0 
                 0 
                 0 
                 0.2 
               
               
                 800 
                 245.0 
                 95.0 
                 75.0 
                 0 
                 0 
                 0 
                 0 
               
               
                 850 
                 245.3 
                 95.3 
                 75.0 
                 0 
                 0 
                 0 
                 0.2 
               
               
                 900 
                 246.1 
                 96.1 
                 75.0 
                 0 
                 0 
                 0 
                 0.4 
               
               
                 950 
                 247.4 
                 97.4 
                 75.0 
                 0.2 
                 0 
                 0.3 
                 0.6 
               
               
                 1000 
                 249.3 
                 99.3 
                 75.0 
                 0.4 
                 0 
                 0.6 
                 0.8 
               
               
                 1050 
                 251.7 
                 101.7 
                 75.0 
                 0.7 
                 0 
                 0.9 
                 1.0 
               
               
                 1100 
                 254.6 
                 104.6 
                 75.0 
                 1.0 
                 0 
                 1.2 
                 1.2 
               
               
                 1150 
                 258.0 
                 108.0 
                 75.0 
                 1.3 
                 0 
                 1.4 
                 1.4 
               
               
                 1200 
                 262.0 
                 112.0 
                 75.0 
                 1.6 
                 0 
                 1.5 
                 1.6 
               
               
                 1250 
                 266.6 
                 116.6 
                 75.0 
                 1.9 
                 0.2 
                 1.6 
                 1.8 
               
               
                 1300 
                 271.6 
                 121.6 
                 75.0 
                 2.3 
                 0.4 
                 1.7 
                 2.1 
               
               
                 1350 
                 277.2 
                 127.2 
                 75.0 
                 2.7 
                 0.6 
                 1.8 
                 2.4 
               
               
                 1400 
                 283.3 
                 133.3 
                 75.0 
                 3.1 
                 0.8 
                 1.9 
                 2.7 
               
               
                 1450 
                 290.0 
                 140.0 
                 75.0 
                 3.5 
                 1.0 
                 2.0 
                 3.0 
               
               
                 1500 
               
               
                 1550 
               
               
                 1600 
               
               
                   
               
               
                 Where the angle between the secondary lateral area and the main area is zero, the main area extends to the steel edge, and the “Width of the main area” equals the “Total Width.” The secondary lateral area is not lateral in this part, and the width of the secondary lateral area is shown because it varies from example to example. Where the angles is zero, the width of the secondary lateral area is also zero.  
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 3 
               
             
            
               
                   
               
               
                 Four examples of a snowboard with a constant width of the first base surface. For simplicity we use in these 
               
               
                 examples snowboards with circular sidecut. and symmetry along both the longitudinal and transversal central axis. 
               
            
           
           
               
               
               
               
               
               
            
               
                   
                   
                   
                 Length (6)-(4) 
                 Sidecut radius 
                   
               
               
                   
                   
                 Length (6)-(8) 
                 (mm) 
                 (mm) 
                   
               
               
                 Total width at (8) 
                 Total width at (6) 
                 (mm) 
                 600 
                 9,010 
                   
               
            
           
           
               
               
               
               
               
            
               
                 (mm) 
                 (mm) 
                 600 
                 Cross sectional angle between 
                   
               
               
                 280 
                 240 
                 Width of each 
                 main area and secondary lateral areas 
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 Distance 
                   
                 Width of the 
                 secondary 
                 (degrees) 
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 from the tip 
                 Total width 
                 main area 
                 lateral area 
                 Example 
                 Example 
                 Example 
                 Example 
               
               
                 (mm) 
                 (mm) 
                 (mm) 
                 (mm) 
                 9 
                 10 
                 11 
                 12 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                   
                   
                   
                   
                   
                   
                   
               
               
                 50 
               
               
                 100 
               
               
                 150 
                 280.0 
                 40.0 
                 120.0 
                 2.0 
                 0.8 
                 1.2 
                 1.8 
               
               
                 200 
                 273.6 
                 50.0 
                 111.8 
                 1.8 
                 0.6 
                 1.1 
                 1.6 
               
               
                 250 
                 267.8 
                 60.0 
                 103.9 
                 1.6 
                 0.4 
                 1.0 
                 1.4 
               
               
                 300 
                 262.5 
                 70.0 
                 96.2 
                 1.4 
                 0.2 
                 0.9 
                 1.2 
               
               
                 350 
                 257.8 
                 80.0 
                 88.9 
                 1.2 
                 0 
                 0.8 
                 1 
               
               
                 400 
                 253.6 
                 90.0 
                 81.8 
                 1 
                 0 
                 0.7 
                 0.8 
               
               
                 450 
                 250.0 
                 100.0 
                 75.0 
                 0.8 
                 0 
                 0.6 
                 0.6 
               
               
                 500 
                 246.9 
                 110.0 
                 68.5 
                 0.6 
                 0 
                 0.5 
                 0.4 
               
               
                 550 
                 244.4 
                 120.0 
                 62.2 
                 0.4 
                 0 
                 0.4 
                 0.3 
               
               
                 600 
                 242.5 
                 130.0 
                 56.2 
                 0.2 
                 0 
                 0.3 
                 0.2 
               
               
                 650 
                 241.1 
                 140.0 
                 50.6 
                 0 
                 0 
                 0.2 
                 0.1 
               
               
                 700 
                 240.3 
                 150.0 
                 45.1 
                 0 
                 0 
                 0.1 
                 0 
               
               
                 750 
                 240.0 
                 160.0 
                 40.0 
                 0 
                 0 
                 0.0 
                 0 
               
               
                 800 
                 240.3 
                 150.0 
                 45.1 
                 0 
                 0 
                 0.1 
                 0 
               
               
                 850 
                 241.1 
                 140.0 
                 50.6 
                 0 
                 0 
                 0.2 
                 0.1 
               
               
                 900 
                 242.5 
                 130.0 
                 56.2 
                 0.2 
                 0 
                 0.3 
                 0.2 
               
               
                 950 
                 244.4 
                 120.0 
                 62.2 
                 0.4 
                 0 
                 0.4 
                 0.3 
               
               
                 1000 
                 246.9 
                 110.0 
                 68.5 
                 0.6 
                 0 
                 0.5 
                 0.4 
               
               
                 1050 
                 250.0 
                 100.0 
                 75.0 
                 0.8 
                 0 
                 0.6 
                 0.6 
               
               
                 1100 
                 253.6 
                 90.0 
                 81.8 
                 1.0 
                 0 
                 0.7 
                 0.8 
               
               
                 1150 
                 257.8 
                 80.0 
                 88.9 
                 1.2 
                 0 
                 0.8 
                 1.0 
               
               
                 1200 
                 262.5 
                 70.0 
                 96.2 
                 1.4 
                 0.2 
                 0.9 
                 1.2 
               
               
                 1250 
                 267.8 
                 60.0 
                 103.9 
                 1.6 
                 0.4 
                 1.0 
                 1.4 
               
               
                 1300 
                 273.6 
                 50.0 
                 111.8 
                 1.8 
                 0.6 
                 1.1 
                 1.6 
               
               
                 1350 
                 280.0 
                 40.0 
                 120.0 
                 2.0 
                 0.8 
                 1.2 
                 1.8 
               
               
                 1400 
               
               
                 1450 
               
               
                 1500 
               
               
                   
               
               
                 Where the angle between the secondary lateral area and the main area is zero, the main area extends to the steel edge, and the “Width of the main area” equals the “Total Width.” The secondary lateral area is not lateral in this part, and the width of the secondary lateral area is shown because it varies from example to example. Where the angles is zero, the width of the secondary lateral area is also zero.  
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 4 
               
             
            
               
                   
               
               
                 An example of an asymmetric snowboard. 
               
               
                 For simplicity we use in these examples snowboards with circular sidecut. 
               
            
           
           
               
               
               
            
               
                   
                 Length (6)-(4) 
                 Sidecut radius 
               
               
                   
                 (mm) 
                 (mm) 
               
               
                   
                 650 
                 16,080 
               
            
           
           
               
               
               
               
            
               
                   
                   
                 Length (6)-(8) 
                 Cross sectional angle between 
               
               
                 Total width at (8) 
                 Total width at (6) 
                 (mm) 
                 main area and secondary lateral areas 
               
               
                 (mm) 
                 (mm) 
                 750 
                 (degrees) 
               
               
                 255 
                 220 
                 Width of each 
                 Example 
               
            
           
           
               
               
               
               
               
            
               
                 Distance 
                   
                 Width of the 
                 secondary 
                 13 
               
            
           
           
               
               
               
               
               
               
            
               
                 from the tip 
                 Total width 
                 main area 
                 lateral area 
                 Example 
                 Example 
               
               
                 (mm) 
                 (mm) 
                 (mm) 
                 (mm) 
                 Right 
                 Left 
               
               
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 0 
                   
                   
                   
                   
                   
               
               
                 50 
               
               
                 100 
               
               
                 150 
                 255.0 
                 80.0 
                 87.5 
                 2.8 
                 2.4 
               
               
                 200 
                 250.5 
                 80.0 
                 85.2 
                 2.6 
                 2.3 
               
               
                 250 
                 246.3 
                 80.0 
                 83.1 
                 2.4 
                 2.2 
               
               
                 300 
                 242.4 
                 80.0 
                 81.2 
                 2.2 
                 2 
               
               
                 350 
                 238.8 
                 80.0 
                 79.4 
                 2 
                 1.8 
               
               
                 400 
                 235.6 
                 80.0 
                 77.8 
                 1.8 
                 1.6 
               
               
                 450 
                 232.6 
                 80.0 
                 76.3 
                 1.6 
                 1.4 
               
               
                 500 
                 230.0 
                 80.0 
                 75.0 
                 1.4 
                 1.2 
               
               
                 550 
                 227.6 
                 80.0 
                 73.8 
                 1.2 
                 1 
               
               
                 600 
                 225.6 
                 80.0 
                 72.8 
                 1 
                 0.8 
               
               
                 650 
                 223.9 
                 80.0 
                 71.9 
                 0.8 
                 0.6 
               
               
                 700 
                 222.5 
                 80.0 
                 71.2 
                 0.6 
                 0.4 
               
               
                 750 
                 221.4 
                 80.0 
                 70.7 
                 0.4 
                 0.2 
               
               
                 800 
                 220.6 
                 80.0 
                 70.3 
                 0.2 
                 0 
               
               
                 850 
                 220.2 
                 80.0 
                 70.1 
                 0 
                 0 
               
               
                 900 
                 220.0 
                 80.0 
                 70.0 
                 0 
                 0 
               
               
                 950 
                 220.2 
                 80.0 
                 70.1 
                 0 
                 0 
               
               
                 1000 
                 220.6 
                 80.0 
                 70.3 
                 0 
                 0 
               
               
                 1050 
                 221.4 
                 80.0 
                 70.7 
                 0.2 
                 0 
               
               
                 1100 
                 222.5 
                 80.0 
                 71.2 
                 0.4 
                 0.2 
               
               
                 1150 
                 223.9 
                 80.0 
                 71.9 
                 0.6 
                 0.4 
               
               
                 1200 
                 225.6 
                 80.0 
                 72.8 
                 0.8 
                 0.6 
               
               
                 1250 
                 227.6 
                 80.0 
                 73.8 
                 1.0 
                 0.8 
               
               
                 1300 
                 230.0 
                 80.0 
                 75.0 
                 1.2 
                 1.0 
               
               
                 1350 
                 232.6 
                 80.0 
                 76.3 
                 1.4 
                 1.2 
               
               
                 1400 
                 235.6 
                 80.0 
                 77.8 
                 1.6 
                 1.4 
               
               
                 1450 
                 238.8 
                 80.0 
                 79.4 
                 1.8 
                 1.6 
               
               
                 1500 
                 242.4 
                 80.0 
                 81.2 
                 2.1 
                 1.7 
               
               
                 1550 
                 246.3 
                 80.0 
                 83.1 
                 2.2 
                 1.8 
               
               
                 1600 
               
               
                   
               
               
                 Where the angle between the secondary lateral area and the main area is zero, the main area extends to the steel edge, and the “Width of the main area” equals the “Total Width.” The secondary lateral area is not lateral in this part, and the width of the secondary lateral area is shown because it varies from example to example. Where the angles is zero, the width of the secondary lateral area is also zero.