| 摘要 |
An in-line roller skate has a forward control wheel 32 positioned above the surface on which the skate is supported by intermediate wheels 34 and 36. The forward control wheel 32 occasionally contacts the surface during normal skating motion and rotates freely when the skater exerts forward motion through the wheel to the surface. When the skater tilts the skate forward to place the forward control wheel into contact with the surface and exerts rearward forces through the forward wheel to the surface, the bearing assembly 33 of the forward wheel locks the wheel against counterclockwise rotation and enables the skater to apply additional thrusting forces to the surface. A rearward control wheel 38 operates in reverse fashion to provide the skater with braking forces.
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