US PATENT SUBCLASS 152 / 61
.~.~.~.~.~.~ Spring

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}
53  DF  .~.~ Pneumatic spring {3}
56  DF  .~.~.~ Annular {4}
59  DF  .~.~.~.~ With separate annulus guide {1}
60  DF  .~.~.~.~.~ Combined drive {6}
61.~.~.~.~.~.~ Spring

DEFINITION

Classification: 152/61

In a spring wheel having a spring encircling rigid annulus supported by an annular pneumatic spring with guide means and combined drive, the drive is cushioned.

(1) Note. For annular pneumatic springs in combination with springs of different types which act as both support and drive springs, see this class, subclasses 30, 34 and 35.