US PATENT SUBCLASS 152 / 17
.~ Spring encircling rigid annulus

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

1  DF  SPRING WHEELS {3}
17.~ Spring encircling rigid annulus {10}
18  DF  .~.~> With nonresilient overload stop
19  DF  .~.~> Convertible to rigid wheel
20  DF  .~.~> With flexible annular support
21  DF  .~.~> Lateral thrust or tension {3}
28  DF  .~.~> Combined spring and friction
29  DF  .~.~> With plural spring types {6}
40  DF  .~.~> Rubber spring {4}
53  DF  .~.~> Pneumatic spring {3}
69  DF  .~.~> Leaf spring {8}
87  DF  .~.~> Coil spring {7}

DEFINITION

Classification: 152/17

Spring wheels having an annular inflexible portion which extends about the wheel outside of the springs. The springs are located radially inwardly of the annulus and resiliently support the annulus against radial motion relative to the wheel center.