US PATENT SUBCLASS 152 / 22
.~.~.~ Combined spring and friction

Current as of: June, 1999
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152 /   HD   RESILIENT TIRES AND WHEELS

1  DF  SPRING WHEELS {3}
17  DF  .~ Spring encircling rigid annulus {10}
21  DF  .~.~ Lateral thrust or tension {3}
22.~.~.~ Combined spring and friction {1}
23  DF  .~.~.~.~> Coil springs {1}

DEFINITION

Classification: 152/22

The lateral thrust or tension mechanism supporting the spring encircling rigid annulus comprises devices wherein friction between two moving elements is increased by spring pressure.