US PATENT SUBCLASS 152 / 40
.~.~ Rubber 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}
40.~.~ Rubber spring {4}
41  DF  .~.~.~> In shear
42  DF  .~.~.~> Cylindrical {1}
44  DF  .~.~.~> Blocks or balls {1}
47  DF  .~.~.~> Annular {4}

DEFINITION

Classification: 152/40

The spring encircling rigid annulus in the spring wheel is resiliently supported against radial motion relative to the wheel center by rubber or its equivalent. This subclass

includes closed rubber chambers wherein the pressure is atmospheric.

SEE OR SEARCH THIS CLASS, SUBCLASS:

53+, for closed rubber chambers wherein the pressure is more than atmospheric.