US PATENT SUBCLASS 152 / 45
.~.~.~.~ With drive

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}
40  DF  .~.~ Rubber spring {4}
44  DF  .~.~.~ Blocks or balls {1}
45.~.~.~.~ With drive {1}
46  DF  .~.~.~.~.~> With separate annulus guide

DEFINITION

Classification: 152/45

In a spring wheel having a spring encircling rigid annulus supported by rubber blocks or balls, said rigid annulus is held against rotation relative to the wheel center, either by modification of wheel or spring elements or by additional means. This subclass includes drive through the springs.

SEE OR SEARCH THIS CLASS, SUBCLASS:

40, -44 for patents wherein the drive is by means of friction, cement or vulcanization and involves no modification of wheel or spring elements.