US PATENT SUBCLASS 152 / 23
.~.~.~.~ Coil springs

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  DF  .~.~.~ Combined spring and friction {1}
23.~.~.~.~ Coil springs {1}
24  DF  .~.~.~.~.~> Double thrust

DEFINITION

Classification: 152/23

In a spring wheel having a spring encircling rigid annulus supported by lateral thrust or tension mechanism involving combined spring and friction devices, the springs are coil springs.