Wheel for skateboards and roller skates

Claim 1

A wheel for skateboards and roller skates, said wheel having a given overall diameter and width as measured in directions respectively normal and parallel to the axis of the wheel and including in combination: (a) a first annular wheel portion of material having a first given coefficient of friction; and (b) a second annular wheel portion of material having a second given coefficient of friction higher than said first given coefficient of friction, said second annular wheel portion being coaxial with and bonded to said first portion, said first portion having a reduced diameter hub extending axially within said second portion, the interior of said second annular portion receiving said hub including projections extending radially inwardly and circumferentially into said hub to rotationally lock said second annular wheel portion to said first annular wheel portion, the outer peripheral edges of said first and second portions each having a radius of from 0.1 to 0.3 of said given width, the radius of the outer peripheral edge of said second portion constituting the edge on the outer axial end of the wheel when mounted on a skateboard or roller skate, continuing in a radial and axial inward direction to cover the outer peripheral edge of said hub to thereby inhibit separation of the first and second portions, the non-radiused ground contacting extent of said second portion in the width direction being from 0.25 to 0.75 to the overall ground contacting extent of both said first and second portions, the outer radiused edges aiding movement of a skateboard or roller skate upon which said wheel is mounted in transition over ground ridges running at acute angles to the direction of motion of said board.