referring now to the drawings , fig1 and 2 show perspective views of a complete skateboard , generally indicated by reference character 9 , as generally seen from the top and bottom , respectively . as can be seen in fig1 and 2 , the complete skateboard 9 is assembled from several skateboard components , including the corrugated skateboard deck , generally indicated by reference character 10 , and other skateboard components , including a pair of trucks 11 , 12 , four wheels 13 - 16 , and four wheel bearings ( not illustrated ). as can be seen from fig1 - 3b , the corrugated skateboard deck 10 has a generally planar configuration including a first end 17 , a second end 18 opposite the first end 17 , a first elongated side edge 19 between the first and second ends 17 , 18 , a second elongated side edge 20 between the first and second ends 17 , 18 and opposite the first elongated side edge 19 , a top surface 21 , and a bottom surface 22 . additionally , at least one of the top 21 and bottom 22 surfaces of the corrugated skateboard deck 10 , has a plurality of elongated corrugations 23 between the first and second ends 17 , 18 ( see fig2 ). the plurality of elongated corrugations 23 functions to increase the longitudinal stiffness and torsional rigidity of the skateboard deck 10 , thereby decreasing the effects of stress experienced by the skateboard deck 10 . as can be best seen in fig3 a - b , showing the skateboard deck 10 alone , a first preferred embodiment of the plurality of elongated corrugations 23 generally extends longitudinally between the first and second ends 17 , 18 in a parallel pattern . alternatively , fig7 a and 7b show second and third embodiments , respectively , of the plurality of elongated corrugations 23 as seen from a top view of the skateboard deck 10 . as can be seen in fig7 a - b , the skateboard deck 10 can have curvilinear corrugation patterns ( fig7 a ) or a logo or other graphic image design ( fig7 b ), but is not limited only to such . the pattern of the elongated corrugations 23 can be widely varied , and the placement can be concentrated along high - impact stress points , such as the points of truck attachment . the plurality of corrugations 23 shown in fig1 - 3b , and 7 a - b are further comprised of a plurality of ridges 24 and grooves 25 , as shown in fig4 - 6b . a first preferred embodiment of the plurality of ridges 24 and grooves 25 is shown in fig4 - 5 . as can be best seen in fig5 showing a detailed , enlarged view of the skateboard deck 10 in fig4 each ridge 24 of the first preferred embodiment preferably has a convex cross - section and a curvilinear apex , but is not limited only to such . as can be seen in fig6 a - b showing second and third embodiments of the plurality of ridges 24 and grooves 25 , the ridges 24 can also have generally pointed apexes and generally conical cross - section ( fig6 a ), as well as a continuous wave - like cross - section ( fig6 b ). one advantage of having elongated corrugations 23 along the bottom surface 22 of a skateboard deck 10 is that it provides less contact area when performing sliding maneuvers along the bottom surface 22 of the skateboard deck 10 . contact area is reduced because of the separation and distance between the apexes of each ridge 24 by an intermediate groove 25 ( see fig5 ). fig8 illustrates a popular skateboarding maneuver known as a “ rail slide ,” where a skateboarder 27 uses the skateboard 9 , to leap onto and slide along a handrail 28 . the plurality of elongated corrugations 23 on the bottom surface 22 enable smoother and faster slides when performing this maneuver . additionally , because the plurality of corrugations 23 strengthen torsional rigidity of the skateboard deck 10 , it is able to better withstand the stress and impact commonly associated with such rail slides . preferably , corrugated skateboard decks 10 are manufactured using a method of corrugating skateboard decks as shown in fig1 a - b . fig1 a - b show a preferred embodiment of the method utilizing high - density corrugating templates 29 , 36 , 37 and first and second sets of wood plies , generally indicated by reference characters 34 and 35 , respectively . the high - density corrugating templates 29 , 36 , 37 are preferably formed from high - density polyethylene or other high - density plastic , with the corrugation design milled on two - sides ( 29 ) or only one - side ( 36 , 37 ). fig9 a - b show a first preferred embodiment of the high - density corrugated template 29 having two corrugated faces , an upper corrugated face 40 , and a lower corrugated face 41 . as can be best seen in fig9 b , both the upper and lower corrugated faces 40 , 41 have ridges with pointed apexes 25 ′ and curvilinear grooves 24 ′ which emboss the grooves 25 and curvilinear ridges 24 , respectively ( see fig5 ). various corrugation designs can be easily milled into corrugation templates with the use of cad / cam systems . as can be best seen in fig1 a - b , the two sets of wood plies 34 , 35 each have multiple layers or plies of wood , ( commonly seven layers ) which are prepared with a bonding agent in - between the wood plies . although only two sets of wood plies 34 , 35 are illustrated in fig1 a - b , additional sets of wood plies may be further stacked on top of first and second sets of wood plies 34 , 35 to produce a greater number of skateboard decks 10 per pressing . as can be seen in fig1 a , the two - sided high - density corrugated template 29 is placed in - between a bottom ply 30 of the first set of wood plies 34 and a top ply 31 of the second set of wood plies 35 . the two one - sided high - density corrugated templates 36 , 37 are placed at remaining outer plies 32 and 33 , respectively . this layered combination is placed in a mold having an upper mold 38 and a lower mold 39 . subsequently , as can be best seen in fig1 b , a pressure p is then applied to the two sets of wood plies 32 , 33 to shape the two sets of wood plies 34 , 35 to that of the mold 38 , 39 . as can be seen in fig9 a and 10a , the high - density corrugating templates 29 ( also fig9 b ), 36 , 37 have a generally straight and flat - shaped cross - section prior to applying the pressure p . however , as can be seen in fig1 b , the high - density corrugated templates 29 , 36 , 37 are sufficiently flexible to bias and conform to the contour of the mold 38 , 39 . the pressure p is applied until the bonding agent sets and can retain the shape of the mold 38 , 39 . it is during this pressure - molding process that the high - density corrugated templates 29 , 36 , 37 emboss the plurality of elongated corrugations 23 onto the bottom surface 30 of the first set of wood plies 34 , the top surface 31 of the second set of wood plies 35 , and the outer plies 32 , 33 of the first and second sets of wood plies 34 , 35 , respectively . after the bonding agent has set , the applied pressure p is released , and the high - density corrugated templates 29 , 36 , 37 are removed . the properties of the high - density corrugated templates 29 , 36 , 37 will typically return to its original unbiased shape as shown in fig9 a for repeated use in subsequent pressings . 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 .
a corrugated skateboard deck and method of corrugating skateboard decks in the skateboard deck manufacturing process . the corrugated skateboard deck has elongated corrugations embossed into at least one of its top and bottom surfaces and generally extending between first and second ends of the skateboard deck . the elongated corrugations are made up of ridges and grooves which are pressure - formed in a method of corrugating the surfaces of skateboard decks . this method utilizes a high - density corrugated template to emboss corrugations under high pressures .