Wheel for roller skates of the inline skate type

A wheel for inline type roller skates, comprising:

• a wheel rim structure having an axis of rotation and having spaced axially outer surfaces, the axially outer surfaces of said wheel rim defining, at least in part, the axially outer contour of said wheel rim, said wheel rim structure further including a plurality of concentric stepped recesses in the axially outer surfaces, said stepped recesses being substantially coaxial with the axis of rotation;
• a ball bearing assembly located in the wheel rim, said ball bearing assembly having radially inner and outer ball-bearing races coaxial with said axis of rotation and a plurality of ball bearings seated therebetween;
• and
• a sealing disk on each axial side of the wheel rim, each said sealing disk being coaxial with said axis of rotation and having a concentric step arrangement including an outer diameter, an intermediate diameter and an inside diameter, said outer diameter being sufficiently large to cover the adjacent axial outer end of said outer ball bearing race without contacting the wheel rim at its periphery, said intermediate diameter being sufficiently large to cover an interface region of said inner and outer ball-bearing races, and said inner diameter being less than an outer diameter of the inner ball bearing races, said concentric step arrangement of the sealing means cooperating with the stepped recesses of the wheel rim and defining a labyrinthine passage between said axially outer surfaces of the wheel rim and said ball bearing assembly.