Abstract:
A two-piece articulated snowboard having a first section held to a second section by a connector. the connector is configured so that it permits some bending so that the longitudinal axis of the board bends at the connector. Preferably, the connector permits very little or no twisting so that the first and second sections stan in the same horizontal plane.

Description:
CROSS-REFERENCE TO RELATED APPLICATION  
       [0001]    The present application is a continuation in part of applicant&#39;s pending application U.S. Ser. No. 09/465,543 filed Dec. 16, 1999. This application also claims the benefit of U.S. provisional application No. 60/112,744 filed Dec. 17, 1998 U.S. provisional application No. ______ filed Jul. 16, 2001. 
     
    
     
       BACKGROUND OF THE INVENTION  
         [0002]    The field of the invention is sporting goods and the invention relates more particularly to snowboards, although boards made according to the teaching of the present invention can also be used on water or sand.  
           [0003]    In the past, commercial snowboards have been limited in their ability to make sharp turns and maneuver over uneven surfaces and around moguls. In addition, they are awkward to store and transport.  
           [0004]    U.S. Pat. No. 5,865,446 to Kobylenski, et al., attempted to address the limitations of the one-piece snowboard by creating an articulated two-piece snowboard that looks very much like a traditional snowboard cut in half and connected with flexible straps. Although the flexible connection appears to give the snowboard some additional maneuverability over a one-piece board by making one board into two shorter boards, the flexible connection results in some significant adverse maneuverability issues.  
           [0005]    The bottom of the Kobylenski board is flat like a traditional, one-piece snowboard, so that each section still has problems moving over and around bumps and uneven surfaces. In addition, and most importantly, the snowboard still must be maneuvered using the edge of the board for turning and direction in a manner similar to the one-piece snowboard. This makes the snowboard less controllable using the stated design than one-piece snowboards for the following reason: by creating a flexible connection, the rider must now contend with two edges, one on each section. To maximize control, the full edge of each section needs to be in contact with the surface of the snow. In order for this to happen, the edges must remain in a straight line. This will require substantial effort on the part of the rider and the sections will normally not remain in a straight line.  
           [0006]    The rider has two options when entering a turn, neither optimal. In the first, the forward foot will be angled into the turn while the trailing foot will tend to be pointed in the original direction. The weight will be on the front foot to make the turn, engaging the full edge of the front section, but with reduced effectiveness, since the edge of the back section is used only minimally—the turn is being performed primarily by the edge of the front section. If the rider inadvertently shifts his weight to the back section, that section will want to maintain the original direction and the board could easily become uncontrollable. In the second method of making the turn, the rider will have more equal weight on both sections, and the angle between the longitudinal axis of both sections will be less than 180 degrees on the side that is being turned toward. The problem with this approach is that only a fraction of the full edge of both sections will be engaged. This will result in decreased turning performance when compared to a one-piece snowboard.  
           [0007]    The primary advantage becomes the primary disadvantage, since the flex in the middle prevents full engagement of both sections&#39; edges. In summary, the use of Kobylenski&#39;s design of a two-piece snowboard with a flexible connector while retaining the same turning method that is used in the one-piece snowboard creates a board that is difficult to control in a turn.  
           [0008]    The present invention introduces an entirely new design for snowboards, comprising two sections with a uniquely shaped convex bottom and joined with a connector. Quite different than the traditional flat-surfaced bottom, the bottom surface of the snowboard of the present invention is not only convex front to back, like the traditional snowboard, but in the preferred embodiment, also somewhat convex side to side. This allows it to move around and through rough, bumpy surfaces, including moguls. The convex bottom has one or more ridges which are used to maneuver and turn the board. The edge of the board is no longer the primary means of turning the board. The ridges are strategically placed on the bottom surface to accommodate various types of terrain and ride. Angled blades can be incorporated in the bottom surface for more aggressive turning capability. Shallow, blunt ridges are best used for fast downhill rides with fewer turns; deeper, sharper ridges are better suited for tighter turns and slower maneuvering. In the preferred embodiment, a springable connector provides enough flex for the rider to alternate turning first one direction, then the other, as the rider glides downhill, while the semi-rigid and non-twisting aspects of the connector provide the rigidity necessary to maintain control.  
           [0009]    The sections can be disconnected for each transport and storage. A user can customize and modify the performance of the invention by: (a) interchanging sections with sections of differing physical and performance characteristics; (b) changing or moving ridges or blades on a section; and/or (c) changing to a different style of connector for joining the two sections.  
         BRIEF SUMMARY OF THE INVENTION  
         [0010]    The present invention is an articulated, two-piece snowboard with separate front and rear sections joined together with a connector, each section providing a platform for one foot. In the preferred embodiment, the bottom surfaces of the sections are convex, with longitudinal ridges along the bottom; the sections are connected with a non-twisting, semi-rigid, springable connector. The sections may be detached from the connector for the purpose of transporting the snowboard or for the purpose of substituting a section or connector with different characteristics. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0011]    [0011]FIG. 1 is an exploded perspective view of the invention of the parent application of the present application.  
         [0012]    [0012]FIG. 2 is a side view thereof.  
         [0013]    [0013]FIG. 3 is a bottom view towards the bottom surface thereof.  
         [0014]    [0014]FIG. 4 is a bottom view illustrating turning blades thereof.  
         [0015]    [0015]FIG. 5 is a bottom view illustrating turning blades thereof.  
         [0016]    [0016]FIG. 6 is a bottom view illustrating a tapered shape thereof.  
         [0017]    [0017]FIG. 7 is a top view thereof.  
         [0018]    [0018]FIG. 8 is a sectional view taken along line  8 - 8  of FIG. 7.  
         [0019]    [0019]FIG. 9 is a plan view thereof as it would appear in a turn.  
         [0020]    [0020]FIG. 10 is a cross-sectional view taken along line  10 - 10  of FIG. 9.  
         [0021]    [0021]FIG. 11 is a plan view thereof.  
         [0022]    [0022]FIG. 12 is a cross-sectional view taken along line  12 - 12  of FIG. 11.  
         [0023]    [0023]FIG. 13 is a plan view thereof.  
         [0024]    [0024]FIG. 14 is a cross-sectional view taken along line  14 - 14  of FIG. 13.  
         [0025]    [0025]FIG. 15 is a cross-sectional view taken along line  15 - 15  of FIG. 13, showing reinforced areas.  
         [0026]    [0026]FIG. 16 is a perspective view of the connection assembly thereof, including the flexible sheath covering the spring.  
         [0027]    [0027]FIG. 17 is a longitudinal cross-sectional view taken along line  17 - 17  of FIG. 16.  
         [0028]    [0028]FIG. 18 is a perspective view of the connection assembly thereof.  
         [0029]    [0029]FIG. 19 is a cut-a-way perspective view of the connection assembly thereof.  
         [0030]    [0030]FIG. 20 is an exploded perspective view of the connection assembly thereof.  
         [0031]    [0031]FIG. 21 is a perspective view of an alternate embodiment of the connection assembly thereof, suing plates in place of the center cord.  
         [0032]    [0032]FIG. 22 is a perspective view of the plates of FIG. 21.  
         [0033]    [0033]FIG. 23 is a fragmentary side view of the plates of FIG. 22.  
         [0034]    [0034]FIG. 24 is a side view of an alternate embodiment of the connection assembly thereof, using a ball and socket.  
         [0035]    [0035]FIG. 25 is a rear side view of the front section of an alternative embodiment of the snowboard of FIG. 24.  
         [0036]    [0036]FIG. 26 is a side view of the connector of the snowboard of FIG. 24.  
         [0037]    [0037]FIG. 27 is a sectional view taken along line  27 - 27  of FIG. 26.  
         [0038]    [0038]FIG. 28 is a side view of an alternate embodiment of the snowboard of FIG. 26.  
         [0039]    [0039]FIG. 29 is a cross-sectional view taken along line  29 - 29  of FIG. 28.  
         [0040]    [0040]FIG. 30A is a top view of the present invention.  
         [0041]    [0041]FIG. 30B us a cross-sectional view taken along line  30 B- 30 B of FIG. 30A.  
         [0042]    [0042]FIG. 31 is a side view of the snowboard of FIG. 30A.  
         [0043]    [0043]FIG. 32 is a bottom view illustrating the placement of ridges of the snowboard of FIG. 30A.  
         [0044]    [0044]FIG. 33 is a cross-sectional view of the present invention taken along line  33 - 33  of FIG. 30A.  
         [0045]    [0045]FIG. 34 is a perspective fragmentary view of attachment of connector to rear section.  
         [0046]    [0046]FIG. 35A is a plan view of the present invention as it would appear in a turn.  
         [0047]    [0047]FIG. 35B is a cross-sectional view taken along line  35 B- 35 B of FIG. 35A.  
         [0048]    [0048]FIG. 36A is a bottom view of an alternative embodiment illustrating placement of two ridges towards the outer edge of the bottom of each section.  
         [0049]    [0049]FIG. 36B is a bottom view of an alternate embodiment illustrating placement of two ridges towards the outer edge and a single ridge in the center of the bottom of each section.  
         [0050]    [0050]FIG. 36C is a bottom view of an alternate embodiment illustrating placement of six ridges on the bottom of each section.  
         [0051]    [0051]FIG. 36D is a bottom view of an alternate embodiment illustrating placement of one ridge on the bottom of each section.  
         [0052]    [0052]FIG. 37A is a cross-sectional view taken along line  37 A- 37 A of FIG. 36A.  
         [0053]    [0053]FIG. 37B is a cross-sectional view taken along line  37 B- 37 B of FIG. 36B.  
         [0054]    [0054]FIG. 37C is a cross-sectional view taken along line  37 -C- 37 C of FIG. 36C.  
         [0055]    [0055]FIG. 37D is a cross-sectional view taken along line  37 D- 37 D of FIG. 36D.  
         [0056]    [0056]FIG. 38A is a plan view, partly in cross-section showing an alternate embodiment of a connector.  
         [0057]    [0057]FIG. 38B is a longitudinal cross-sectional view taken along line  38 B- 38 B of FIG. 38C showing an alternate embodiment of a connector.  
         [0058]    [0058]FIG. 38C is a top plan view of the alternative embodiment of the connection of FIG. 38A.  
         [0059]    [0059]FIG. 38D is an enlarged fragmentary view of the alternate embodiment of the connection of FIG. 38A.  
         [0060]    [0060]FIG. 38E is a fragmentary perspective view of the bill alternate embodiment of the connector of FIG. 38D.  
         [0061]    [0061]FIG. 38F is a perspective view of the alternate embodiment of the connector of FIG. 38D.  
         [0062]    [0062]FIG. 38G is a top view of the alternative embodiment of the connector of FIG. 38D.  
         [0063]    [0063]FIG. 39A is a side view of an alternative embodiment of a connector.  
         [0064]    [0064]FIG. 39B is a side view of the alternative embodiment of the connector of FIG. 39A without the spring.  
         [0065]    [0065]FIG. 39C is a cross-sectional side view of the alternate embodiment of the connector of FIG. 39C.  
         [0066]    [0066]FIG. 39D is a fragmentary perspective view of an arrangement of metal plates used in the alternate embodiment of the connector of FIG. 39A.  
         [0067]    [0067]FIG. 39E is an enlarged side view of the alternate embodiment of the connector of FIG. 39F.  
         [0068]    [0068]FIG. 39F is a side view of the alternate embodiment of connector which places the springable connection on the front and rear sections connected by an inflexible rod. 
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0069]    The preferred embodiment of the present invention, as best shown in FIG. 1, comprises a front section  54  and a rear section  56  joined with a springable connection assembly  55 . Although front section  54  and rear section  56  are depicted as identical, they may differ in size, shape or construction to alter the performance characteristics of the invention. The rider of the invention will place one foot on section  54  and one foot on section  56 , preferably with feet at angles to the longitudinal axis in a stance similar to that used by traditional snowboarders.  
         [0070]    Connection of the Three Primary Parts of the Invention: Front Section, Rear Section and Springable Connection Assembly.  
         [0071]    [0071]FIG. 1 illustrates how the three primary pieces of the invention, the front section, the rear section, and the springable connection assembly, are attached to one another. To connect the front section and the rear section to the springable connection assembly, block  60 R, preferably rectangular, is inserted into a slot, hollow or mating cavity  45 R and block  60 L is inserted into the slot, hollow or mating cavity  45 L. Block  60 L is primarily secured by two bolts  43 L which are inserted into two holes  64 L in the block and into threaded sleeves or holes in the wall of the mating cavity  45 L. In addition, a bolt  41 L is inserted through washer  67 L into sleeve or hole  53 L, where it passes through loop  80 L of the connection assembly and into a threaded receptacle and tightened. The purpose of bolt  41 L is to prevent separation of section  54  from the connection assembly in the event that bolts  43 L fail under stress. In the same manner, block  60 R is primarily secured by two bolts  43 R which are inserted into two holes  64 R in the block and into threaded sleeves or holes in the wall of the mating cavity  45 R. In addition, a bolt  41 R is inserted through washer  67 R into sleeve or hole  53 R, where it passes through loop  80 R of the connection assembly and into a threaded receptacle and tightened. The purpose of bolt  41 R is to prevent separation of section  54  from the connection assembly in the event that bolts  43 R fail under stress.  
         [0072]    Front Section: Shape and Outer Surface.  
         [0073]    The front section has a convex-shaped bottom. the bottom surface of the section is not only convex parallel to the longitudinal axis as shown in FIG. 2, bit is also preferably convex perpendicular to the longitudinal axis, as shown in cross-sectional view in FIG. 8. This would usually mean that the lowest part  66  of the bottom surface is lower than the outside edges  63  of the bottom surface. The outside edges  63  are usually rounded or curved upward to prevent the edges  63  from digging into the snow, except when usage may require less rounding and more of a sharp or pointed edge, such as steep terrain or stunt riding. The leading edge  57  in FIG. 2 is curved upward somewhat. The top surface  40 L of said front section is used as a platform for one of the rider&#39;s feet. Two rigid strips  49 , shown in FIG. 1, preferably metal, are connected to the top surface  40 L with screws or other connectors. Said strips provide longitudinal reinforcement for said section. The trailing edge  59  of the front section curves upward and then flattens as it forms the upper surface of a mating cavity  45 L; said mating cavity is a receptacle for block  60 L of the connection assembly  55 .  
         [0074]    Front Section: Bottom Surface.  
         [0075]    The bottom surface  42 L of the invention is best shown in FIG. 3. Ridges  44  extend longitudinally along the bottom surface. The triangular shape of the ridges  44  are shown in cross-sectional view in FIG. 8. (To better describe the shape of the ridges: if one were to extrude a triangle and place one of the flat surfaces of the three-sided extrusion against the bottom surface of the section, running lengthwise, one would then have a ridge.) The number of ridges can be varied in order to modify the performance characteristics of the invention.  
         [0076]    In addition, the ridges themselves can vary. An alternate embodiment of a ridge is depicted in FIG. 8, where a blade  115 , made of metal or other hard material, protrudes from the bottom of one or more ridges to provide additional “bite” and improved control. Longitudinal blades facilitate movement in a direction parallel to the longitudinal axis of the section.  
         [0077]    Blades may also be used to aid in turning and/or stopping, and are usually placed on the periphery of the sections. FIGS. 4, 5, and  6  illustrate placement of blades and ridges. FIG. 4 shows two sets of turning blades  71  and  67 . Angled out blades  71  are pointed away from the longitudinal axis of the section to facilitate the turning of the front section in the direction of the turn. For example, the front section will turn right in a right-hand turn. Angled-in blades  67  on the rear section are pointed towards the longitudinal axis of the board so that the rear section will tend to turn in the direction away from the turn. For example, the rear section will tend to turn left in a right-hand turn, which places the invention in a curve to the right, and facilitates the turn. FIG. 4 also shows two sets of stopping blades. Angled-out stopping blades  69  have more stopping power than angled-in stopping blades  68 .  
         [0078]    [0078]FIG. 5 shows one right turning blade on each section and one left turning blade on each section, rather than the two blades per side per section, as shown in FIG. 4.  
         [0079]    [0079]FIG. 6 depicts turning blades that are parallel to the sides of the sections, but since the sections are themselves slightly angled, this results in the blades  116  angled out and the blades  117  angled in, resulting in the functionality as the boards in FIGS. 4 and 5, with the additional advantage of the board shape working with the turning blades to further facilitate turns.  
         [0080]    In all cases of ridges and blades, the convexness of the bottom surface perpendicular to the longitudinal axis combined with the ridges, including longitudinal, turning or stopping ridges, are some of the key differences between this invention and traditional snowboards or skis.  
         [0081]    Front Section: Spacers.  
         [0082]    [0082]FIGS. 1 and 7 show bumpers or spacers  47 L, located on the sides of the trailing edge of the front section. The spacers are preferably constructed of hard, resilient material such as a hard rubber or similar material.  
         [0083]    Front Section: Internal Construction.  
         [0084]    [0084]FIGS. 12, 14, and  15  illustrate the internal construction of the invention. The inner core  50  is surrounded by a durable outer layer  51 . The inner core is preferably a carvable foam, but can be wood, composite or a similar material that helps to provide shape to the invention. The outer layer is preferably fiberglass resin and cloth, but can be any material that helps to provide a durable outer layer of adequate strength, such as an injection molded plastic, a composite, metal, carbon fiber, or any other similar material. Additional reinforcement for high stress areas may be desirable, depending on materials used. In the preferred embodiment, reinforcement material  52  is used in the trailing edge of the front section so as to reinforce the mating cavity which holds the connection assembly block. Reinforcement material is preferably a plastic that pours and molds into the desired shape, but can be any material that increases the strength and durability of the area, such as a high-strength plastic, composite, metal or any other similar it material. A lengthwise band of the reinforcement material  48  is also used under strips  49 , as shown in FIGS. 14 and 15.  
         [0085]    Rear Section: Same as Front Section.  
         [0086]    [0086]FIG. 1 shows the rear section  56  to be a mirror image of the front section. Therefore, the description above of the front section applies also to the rear section, except that the leading edge  57  of the front section is the trailing edge  61  of the rear section, and the trailing edge  59  of the front section is the leading edge  58  of the rear section. And the part numbers use “R” instead of “L” as a suffix.  
         [0087]    Connection Assembly: Overview.  
         [0088]    [0088]FIG. 20 illustrates the connection assembly. The connection assembly resists movement from its unstressed position. In addition, it is advantageous if it can be easily disconnected from the front and back sections for storage and replacement purposes.  
         [0089]    Connection Assembly: The Innermost Cord Within the Tube.  
         [0090]    In FIG. 20, a cord  82 , preferably constructed of a strong, flexible material such as stranded cable, with loops  80 L and  8 OR at each end, is inserted into a flexible tube  72 . The tube is preferably filled with a flexible filler material  86 , such as silicone. Flanges  70 L and  70 R are inserted into front end and back end of tube  72 , respectively.  
         [0091]    Connection Assembly: Spring, Clamps and Block.  
         [0092]    The tube  72  is inserted into a spring  78 . Circular clamps  74  and  76  are tightened around the front end of the spring. Circular clamps  79  and  81  are tightened around the rear end of the spring. Cord, tube, flexible filler, flanges, spring and circular clamps connect to form a spring assembly  65 . The blocks  60 L and  60 R are preferably a moldable, rigid material, such as plastic or resin.  
         [0093]    Connection Assembly: Spring Assembly an Integral Part of Block.  
         [0094]    The front end and rear end of the spring assembly are molded into block  60 L and  60 R, respectively. Making the spring assembly an integral part of the block anchors the spring assembly at each end and aims to prevent movement of the end of the spring in the direction of the coils, clockwise and counter-clockwise. The purpose of the circular clamps now becomes apparent—they provide asymmetrical projections within the block to help prevent the spring assembly from twisting and breaking loose inside the block. Tubes  62 L insert in holes  64 L to prevent damage to block  60 L from over-tightening of bolts  43 L (shown in FIG. 1). FIG. 18 illustrates the connection assembly. FIG. 19 is a cut-a-way of the connection assembly, showing the relationship of the spring assembly and block. FIG. 17 is a longitudinal cross-sectional view of the connection assembly.  
         [0095]    Connection Assembly: Snow Barrier Covering on the Spring.  
         [0096]    [0096]FIG. 16 illustrates a covering  84  over the spring, which may be made of rubber or other barrier to prevent show from lodging between the coils of the spring.  
         [0097]    Connection Assembly: Non-twistable.  
         [0098]    [0098]FIGS. 21, 22, and  23  illustrate a non-twistable version of the connector. The cord  82  is replaced with a plate assembly, depicted in FIG. 22, comprised of preferably metal plates fastened with bolts. A bolt  88  passes through an upper plate  83 , a washer  90 , a middle plate  85 , a washer  90 , a lower plate  87 , and nut  89 , respectively. The plate assembly is positioned within the connector as shown in FIG. 21. When attaching the connector to the front and back sections of the invention, the blocks  60 L and  60 R are inserted in the receptacles  45 L and  45 R, and the bolts  41 L and  41 R are inserted through a hole  73  of the connector and secured to the respective section.  
         [0099]    Connection Assembly: Rigid Connector, Ball and Socket Joint.  
         [0100]    [0100]FIGS. 24, 25,  26 , and  27  illustrate a ball and socket joint that will provide motion in all directions with a rigid connector. The connector is a rod  94 , preferably metal, with spheres  93 L and  93 R at each end, as shown in FIG. 26. A horizontal slot  95  allows the rod  94  to swing left to right, horizontally. The spheres allow the sections to twist around their longitudinal axis. The spheres  93 L and  93 R are held securely within each section with a door  120 . Vertical motion could be added by including a vertical slot. Or full range motion could be implemented with a funnel-shaped hole, with the sphere at the narrow end and the rod having the wide end of the funnel to move freely. FIGS. 28 and 29 illustrate a rigid connector for the ball and socket joint that would prevent twisting and would only allow movement in the horizontal plane. The spheres are flattened into discs  96 L and  96 R so that they will not move up and down, but only horizontally.  
         [0101]    A preferred embodiment of the present invention, as best shown in FIG. 30A, comprises a front section  254  and a rear section  256  joined with a stiff but elastically bendable connector  255 . Although front section  254  and rear section  256  are depicted as identical, they may differ in size, shape or construction to alter the performance characteristics of the invention. The rider of the invention will place one foot on section  254  and one foot on section  256 , preferably with feet at angles to the longitudinal axis in a stance similar to that used by traditional snowboarders. A “stiff but elastically bendable” means a connector fabricated from a material such as spring steel. Other materials, such as polymeric materials of ultra high molecular weight polyethylene, polypropylene, and including composite polymers, can be used. The important quality is that of providing a stiff connection and yet, one that will bend with sufficient force. A typical connector stiffness is illustrated in FIG. 35A. A weight W of ten pounds is applied normal to the longitudinal axis of rear section  256  a distance D 1  of ten inches behind trailing edge  259  of front section  254 . This causes a bending of connector  255 . The amount of deflection D 2  measured 21.6 inches behind trailing edge  259  was 2.6 inches. This, of course, is just an example of a practical stiffness and it is possible to change this stiffness substantially and provide more deflection for a younger rider and less deflection for a heavier adult rider.  
         [0102]    Connection of the Three Primary Parts of the Invention: Front Section, Rear Section and Connector.  
         [0103]    [0103]FIG. 30A and FIG. 34 illustrate how the three primary pieces of the invention, the front section, the rear section, and the connector is inserted into a channel, slot, or cavity  170 L in an open housing or block  150 L. Locking pins or bolts  151 L are inserted into holes  153 L and secured with nuts  152 L. Locking pins  151 L secure the connector to the front section. To connect the rear section to the connector, the connector is inserted into a channel, slot, or cavity  170 R in an open housing or block  150 R. Locking pins or bolts  151 R are inserted into holes  153 R. Locking pins or bolts  151 R secure the connector to the rear section.  
         [0104]    Front Section: Shape and Outer Surface.  
         [0105]    The front section has a somewhat convex bottom. The bottom surface of the section is not only convex parallel to the longitudinal axis as shown in FIG. 31, it is also preferably convex perpendicular to the longitudinal axis, as shown in cross-sectional view FIG. 30B. This would usually mean that the lowest area, ridges  180 L of the bottom surface, are lower than the outside edges  182 L of the bottom surface. The leading edge  257  in FIG. 31 is curved upward somewhat. The trailing edge  259  of the front section also curves upward.  
         [0106]    Front Section: Bottom Surface.  
         [0107]    The bottom surface  242 L of the invention is best shown in FIG. 32. Ridges or protrusions  180 L and  181 L extend somewhat longitudinally along the bottom surface. The centermost ridges  180 L are approximately parallel to the longitudinal axis. The outside ridges  181 L are slightly angled; when facing towards the front of the board, the forward end of the ridges on the left side of the front section are angled towards the left and the forward end of the ridges on the right side of the front section are angled towards the right. When the section is tipped onto its side by the rider, these ridges are engaged and cause the board to turn more tightly.  
         [0108]    Front Section: Bottom Platform Width.  
         [0109]    Longitudinal center ridges  180 L in FIG. 30B are the two lowest points on the bottom of the front section. They are, therefore, in contact with the snow, creating a platform on which the rider balances the section. The distance between the two center ridges  180 L is approximately 3 inches. A front section with a distance between the two center ridges  180 L of less than 3 inches will tip more easily from one side to the other, and will be less stable, making it more difficult to maintain a consistent side-to-side position. A front section with a distance between ridges  180  greater than 3 inches will be less likely to tip from side-to-side and will be more stable and easier to balance. The optimal platform width for a section will be determined by the size and shape of the section, as well as number and placement of ridges on the bottom of the section.  
         [0110]    Front Section: Internal Construction.  
         [0111]    [0111]FIG. 33 illustrates the internal construction of the invention. the inner core  191  is surrounded by a durable outer layer  190 . The inner core is preferably a carvable form, but can be wood, composite or a similar material that helps to provide shape to the invention. The outer layer is preferably fiberglass resin and cloth, but can be any material that helps to provide a durable outer layer of adequate strength, such as an injection molded or rotationally cast plastic, a composite, a metal, carbon fiber, or any other similar material. Additional reinforcement for high stress areas may be desirable, depending on materials used. In the preferred embodiment, reinforcement material  161 L is used in the trailing edge of the front section so as to reinforce the area around the embedded extension  162 L of the block  150 L. Reinforcement material is preferably a plastic that pours and molds into the desired shape, but can be any material that increases the strength and durability of the area, such as a high-strength plastic, composite, metal or any other similar material. If a section could be constructed with injection molded plastic or similar process, the carvable inner core and some other elements described herein may not be required.  
         [0112]    Rear Section: Same as Front Section.  
         [0113]    [0113]FIG. 30 shows the rear section  256  to be a mirror image of the front section. Therefore, the description above of the front section applies also to the rear section, except that the leading edge  257  of the front section is the trailing edge  261  of the rear section, and the trailing edge  259  of the front section is the leading edge  258  of the rear section. And the part numbers use “R” instead of “L” as a suffix.  
         [0114]    Connector: Overview.  
         [0115]    [0115]FIGS. 33 and 34 illustrate how the connector is attached to each section. The connector consists of one or more strips of a semi-rigid, flexible material, such as metal, ultra high molecular weight plastic, or other material with similar characteristics, or a combination of one or more such materials. The important characteristics of the connector are: that it flex from side-to-side in the horizontal plane; that it be unable to flex up and down in the vertical plane; that it not be able to twist so as to provide a stable riding platform; that it be sufficiently strong; that it resist movement from its unstressed position; and that it return to its unstressed position if moved into a different position. The attachment of the connector is such that it can be easily disconnected from the front and back sections for storage and replacement purposes.  
         [0116]    Connection Assembly: Details.  
         [0117]    The connector is preferably one strip of metal, or a side-by-side sandwich of two or more strips of metal. It may also include strips of other materials such as plastic or rubber in the sandwich. The resulting connector must be strong enough to resist flexing, but still be able to be flexed on demand by the movement of the rider&#39;s feet. FIG. 34 illustrates the attachment of the connector to the rear section. The front section will be the same, except for the numbering of the various items—the front section numbers end in “L” instead of “R”. Block  150 R is open on two sides—the side facing the connector and the side facing the top. The end of connector  255  slides into channel  170 R. Holes  154 R in the connector line up with holes  153 R in the block. Locking pins or bolts  151 R are placed in holes  153 R and secured with nuts  152 R.  
         [0118]    Operation of Preferred Embodiment; Turning the Invention.  
         [0119]    A rider will place one foot on the front section of the invention and one foot on the rear section. The rider will preferably have both feet secured to the respective sections. Traveling downhill over the snow, the rider can pivot his feet to point to the left or to the right, causing the board to pivot in the same direction. When the rider pivots his front foot to point to the right, the front section will turn to the right, which causes the entire board to turn to the right. When the rider pivots his front foot to point to the left, the front if section will turn to the left, which causes the entire board to turn to the left. This turning tendency can be increased by placing ridges on the periphery of the sections at an angle to the longitudinal axis of the section, enabling the rider to further change his direction of travel by tilting the front or rear section about its longitudinal axis by shifting his weight left or right. When the rider&#39;s weight is shifted left, for example, that section&#39;s left side will tilt down as depicted in FIG. 35A and FIG. 35B, engaging ridges or blades that are angled to the left, and increasing the tendency of the section to turn left. Similarly, when the section is tilted down on the right, blades or ridges that are angled to the right will made contact with the surface, increasing the tendency of the section to turn right.  
         [0120]    Stability.  
         [0121]    The connector, when flexed, exerts a force against the flexion in an attempt to return to its unflexed state. This gives the invention a predictable stability. The sections will tend to stay in a straight line (an unflexed position), as illustrated in FIG. 30A, unless the rider proactively moves them out of the straight, unflexed position, as depicted, for example, in FIGS. 35A and 35B, as a turn to the left.  
         [0122]    East of Connecting/Disconnecting Sections.  
         [0123]    It is desirable to be able to easily connect and disconnect the sections. To this end, the connector is secured to each section with only two pins or bolts, easily removed by the rider. In an alternative embodiment for commercial production and use, the connector end can be dropped into a receptacle and secured with a hinged latch without the use of bolts to make it easier for the user to connect and disconnect.  
         [0124]    Interchangeable Connectors.  
         [0125]    The performance characteristics of the invention can be modified by using connectors with different flex characteristics. The lighter weight rider and the beginning rider might prefer a connector that is easier to flex, since the sections would be easier to maneuver. In addition, connectors can be varying lengths to accommodate the stride of different sized riders.  
         [0126]    Interchangeable Sections.  
         [0127]    Because invention performance can be modified by changing the characteristics of the front and rear sections, a rider may prefer one set of characteristics for the front section and another set of characteristics for the rear section. The rider can easily replace a front or rear section with a front or rear section having different characteristics. In fact, because the connection between front and rear sections may be identical and interchangeable, a rider can use a rear section from one sample of the invention as a front section, or a front section to replace a rear section in another sample of the invention.  
         [0128]    Modifications to Section Bottom That May Change Performance.  
         [0129]    Some of the characteristics of the invention that can be modified in order to change performance of the invention include: changing size, shape, contour, and number of ridges on the front and/or rear sections; changing the convexness of the bottom of the front or rear section; changing the length of a section; making ridges deeper or more shallow; modifying ridges with undulations on the ridges or ridges on the ridges. The sections may be identical mirror images as described in the preferred embodiment, or they may differ in shape and/or size.  
         [0130]    Alternate Embodiments of Board Shape as Viewed from Above.  
         [0131]    [0131]FIG. 32 illustrates the board shape as viewed from the bottom, approximating an oval shape, except that the inside curve is more pointed than the outside curve. Alternate embodiments of the board shape may have the outline shape of either the leading or trailing half of the section as different than depicted.  
         [0132]    Alternate Embodiment of Lateral Cross Section.  
         [0133]    [0133]FIG. 30B illustrates a cross-section of the preferred embodiment of the invention. An alternate embodiment of the board has a smaller or greater distance between the top surface and the bottom surface of a section.  
         [0134]    [0134]FIGS. 37A, 37B,  37 C, and  37 D illustrate alternate embodiments of various bottom shapes and ridge placements.  
         [0135]    Alternate Embodiments of Bottom Surface.  
         [0136]    Ridge Placement.  
         [0137]    A single ridge may run longitudinally down the bottom of the board as in FIG. 36D; the bottom of the board may have only outer ridges as depicted in FIG. 36A; the bottom of the board may have one central ridge and two outer ridges, as in FIG. 36B; the bottom of the board may have multiple sets of ridges as in FIG. 36C.  
         [0138]    Number of Ridges.  
         [0139]    As indicated, the bottom surface can have one or more ridges.  
         [0140]    Depth of Ridges.  
         [0141]    The ridges can vary in depth, which is defined as the distance from the bottom-most edge to the uppermost point of the ridge. Described another way, looking at the cross-section “V” shape of a ridge, the depth would be measured from the bottom of the “V” to the top of the “V”.  
         [0142]    Partial Ridge Coverage Longitudinally.  
         [0143]    The ridges may extend the entire length of the board, from front to back, or they may extend over only a portion of the lengthwise distance. For example, a ridge could be only half the length of the board, starting from ¼ back from the leading edge and extending to ¾ back from the leading edge. Or a 2 inch ridge could be located close to the leading edge and another 3 inch ridge could be located back by the trailing edge.  
         [0144]    Ridge Construction.  
         [0145]    The ridges can be made of a material similar to the rest of the invention, or one or more ridges can consist of another material, or be constructed of multiple materials. Although the ridges would typically be constructed of a hard material, they may also be constructed of a flexible material. Ridges may have sharper, better-cutting edges by incorporation of a vertical blade made of metal or similar material.  
         [0146]    Cross-Sectional Shape of Ridges.  
         [0147]    The cross-sectional shape of the ridges as described in the preferred embodiment is triangular for the outer ridges and somewhat oval for the inner ridges. These shapes could be some other shape such as trapezoidal, rectangular, or curved (such as convex or concave-sided triangle or other polygon).  
         [0148]    Angle of Protrusion of Ridges.  
         [0149]    The angle of protrusion of the ridges in relationship to the tangent at the surface from which the ridges are protruding may be other than the preferred embodiment, which is perpendicular.  
         [0150]    Ridges Placed on the Board for the Purpose of Turning.  
         [0151]    Ridges may be used for turning. Ridges used for turning will preferably be placed on the periphery of a section and may vary in size, length, quantity, placement and construction.  
         [0152]    Ridges Placed on the Board for the Purpose of Slowing or Stopping.  
         [0153]    Ridges may be used for slowing and/or stopping. Ridges designed to slow or stop the board would preferably be placed in opposing pairs (one ridge turned to the left and one to the right), or as one or more ridges placed approximately perpendicular to the longitudinal axis of the section. They could be located on the periphery of the board, so that when the rider pushed the periphery down to engage the surface, the ridges would slow or stop the board. They could also be located elsewhere on the board and designed to drop down and engage when the rider&#39;s foot pressed an engagement mechanism.  
         [0154]    Ridges Summarized.  
         [0155]    In summary, ridges can be combined in a variety of ways, including varying uses, quantities, depths, lengths, angle, sharpness, shapes, location on board, construction, and composition.  
         [0156]    Other Bottom Surface Additions for the Purpose of Increasing Friction.  
         [0157]    A shape or material other than ridges can also be added to the bottom surface to increase friction under certain situations. This could be desirable, for example, on the far right or left side of the undersurface of the board, so that when that side of the board is tilted down, the friction on the side is increased, increasing drag and aiding in the turn towards that side. It may also be placed on the front or back of a section to improve braking action.  
         [0158]    Removably Secured Bottom Surface Ridges or Additions. Ridges or bottom surface additions may be designed to be removable and/or changeable to allow users to customize the bottom surface of each section. For example, ridges set at a greater angle from the longitudinal axis would provide a rider with more extreme turning capabilities.  
         [0159]    Bottom Platform Variations.  
         [0160]    The platform that rides on the snow may be two ridges  180 L separated by a concave surface  183 L, as illustrated in FIG. 30B. The ridges  180 L should be separated sufficiently so that the user may stand on a section and have the section supported in a stable non-tipping manner. A preferable separation should be between two and six inches with about three inches being preferred. Alternatively, the platform may be a flat surface  184 L as illustrated in FIG. 37A; or a single ridge  186 L embedded in a flat surface  185 L as illustrated in FIG. 37B; or a single ridge on a shallow, convex bottom as illustrated in FIG. 37D.  
         [0161]    Alternate Embodiments of the Connector.  
         [0162]    Number Connectors.  
         [0163]    More than one connector may be used to provide a less movable attachment between front and rear sections.  
         [0164]    Dimensions of Connector.  
         [0165]    The length and girth of the connector may vary. It could be as wide as the width of the front and back sections, or vary aft narrow. Although its length may be from approximately 2 inches to 5 inches long, it may be less that 2 inches or greater than 5 inches.  
         [0166]    Non-Rigid Connector.  
         [0167]    There may be situations where a non-rigid connector is preferred over a semi-rigid connector.  
         [0168]    Alternate Embodiments of Springable Connector.  
         [0169]    Metal Spring Plates Mounted on Each Section.  
         [0170]    [0170]FIGS. 38 A, 38B,  38 C,  38 D,  38 F and  38 G illustrate a springable connection that uses an inflexible, non-springable rod  302  connected to a cylinder  301 L and  301 R. Speaking of the front section  340 L, flexible metal plates (such as a leaf spring)  304  and  305  provide a flexible, springable wall for the rod  302  to push against. The cylinder  301 L pivots within the reinforced area  303 . When turning to the left, the rod  302  would push against the metal plate  305 , forcing the coil  307  to travel away from the rod in a horizontal direction. The same connection assembly is duplicated on the rear section of the present invention, providing a connection which has its ability to spring back and forth located within each section, rather than in the connector itself.  
         [0171]    [0171]FIGS. 39A, 39B,  39 C, and  39 D illustrate a springable connector made of horizontal metal plates. An upper metal plate  402 L and a lower metal plate  413 L, protruding from a block  450 L, made with a center metal plate  405 . the plates are held in place with a bolt  402 L, washers  404  and a locknut  414 L. The horizontal joint thus formed could also be created using other materials, such as a horizontal universal joint. A compression spring  401  is secured on the front side to a block  450 L and on the rear side to a block  450 R. Thus, a springable connection is created using a single joint and spring.  
         [0172]    [0172]FIGS. 39E and 39F illustrate a biased connection located on a front section  554  of the present invention. A spring  503 L is secured to a block  501 L which is secured to the top surface  540 L of the front section. Two metal plates  505 L which are secured to block  501 L mate to a rod or preferably inflexible metal plate  555 . The metal plate  555  is secured to metal plates  505 L with a bolt  504 L. A block  502  is secured to top surface  540 L to further control the spring  503 L. When the front section is turned left or right, the metal plate  555  moves horizontally, and is returned to its original position with the spring.  
         [0173]    Summary of Alternate Embodiments of Springable Connector.  
         [0174]    The connector of the preferred embodiment was continuously flexible and springable. In addition, the springable connector may consist of one or more inflexible segments, or it may be completely inflexible so that the flexibility is provided by its connection to the front and/or rear sections.  
         [0175]    Alternate Embodiments of Materials of Construction.  
         [0176]    The invention may be constructed of any number of appropriate materials, including carbon fiber, fiberglass, Kevlar, plastic, metal, wood, foam and composite. It is envisioned that commercial production may involve some type of injection or rotational molding.  
         [0177]    Conclusions, Ramifications and Scope.  
         [0178]    Accordingly, due to its two-piece articulated construction, the convex shape of the bottom of each section, the longitudinal ridges on the bottom surface, and the non-twisting, springable connector between the front and rear sections, this invention offers a rider capabilities not heretofore experienced.  
         [0179]    The term “approximately convex” is used in the claims herein to mean largely convex, but also possibly including some flat or even slightly concave portion along a minor part of the lower surface.  
         [0180]    Maneuverability, the key advantage of the present invention is made possible with the two-piece construction, the semi-rigid, springable connector and the shape of the bottom. Placement and type of ridges on the bottom provide for further options to change the performance characteristics of the board. When the ridges incorporate blades made of metal or similar material, the rider will be able to easily make controlled turns around even moguls.  
         [0181]    The connector is constructed to made with a variety of sections, and sections can easily be interchanged, giving a rider a wide variety of performance choices. In addition, the rider can add, remove or move turning ridges, further increasing choices. the invention can be easily dismantled into sections and connector for easy transport and storage.  
         [0182]    The advantages of this invention over previous snow riding boards and skis are as follows:  
         [0183]    Two-piece construction means increased maneuverability.  
         [0184]    Convex bottom glides over and around bumps and moguls.  
         [0185]    Longitudinal ridges provide maneuverability and control.  
         [0186]    Ridges placed at any angle to the longitudinal access provide more aggressive turning capabilities.  
         [0187]    Non-twisting, springable connector contributes to stability and control.  
         [0188]    Interchangeable parts means more performance options for the rider at lower cost.  
         [0189]    While the above-mentioned specifications are directed to a snowboard, the same structure and characteristics could be used in a waterboard or a board used to surf on sand.  
         [0190]    Thus, the foregoing description is considered as illustrative only of the principles of the invention. Furthermore, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and process shown as described above. Accordingly all suitable modifications and equivalents may be resorted to falling within the scope of the invention.  
         [0191]    The present embodiments of this invention are thus to be considered in all respects as illustrative and not restrictive; the scope of the invention being indicated by the appended claims rather than by the foregoing description. All changes which come within the meaning and range of equivalency of the claims are intended to be embraced therein.