Skateboard roller wheel assembly

Claim 1

In combination with an elongate skateboard that has a platform that has a top surface on which a user stands and a bottom surface, a pair of longitudinally spaced roller wheel assemblies secured to said bottom surface, each of said roller wheel assemblies including: a. a hollow rigid frame that includes a pair of transversely spaced side pieces that have forward and rearward ends, a pair of first legs that extend forwardly and inwardly from said first ends to develop at their forward extremities into an eye, a pair of second legs that extend rearwardly and inwardly from said second ends to develop at their rearward extremities into a ball, and said side pieces at substantially the centers thereof having transversely aligned bores defined therein; b. first means secured to said bottom surface that resiliently engage said eye and force said frame to tilt transversely when said platform is tilted transversely by said user in guiding said skateboard in a curved path; c. second means secured to said bottom surface that pivotally engage said ball; d. a transverse shaft supported in said bores, said shaft including threaded end portions that project outwardly from said side pieces; e. a pair of nuts that engage said end portions and removably hold said shaft in a fixed position in said frame; f. a first ball bearing assembly mounted on substantially the center of said shaft and a pair of second ball bearing assemblies mounted on said shaft on opposite sides of said first ball bearing assembly and independently rotatable relative to the latter; g. a first generally cylindrical roller wheel formed from a resilient polymerized resin rotatably supported on said shaft by said first ball bearing assembly; and h. a pair of second generally frusto-conical roller wheels formed from a resilient polymerized resin rotatably supported on said shaft by said second ball bearing assemblies, said skateboard when guided in a straight path by said user having the major portion of the weight of said user supported on said first roller wheel and a minimum surface of said roller wheels in contact with a supporting surface on which said skateboard is used but said frame in cooperation with said first means and shaft forcing one of said second roller wheels into additional frictional rotatable contact with said supporting surface when said platform is transversely tilted by said user in guiding said skateboard in a curved path.