US PATENT SUBCLASS 152 / 57
.~.~.~.~ Rigid annulus enclosing

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}
57.~.~.~.~ Rigid annulus enclosing

DEFINITION

Classification: 152/57

The annular pneumatic spring supporting the spring encircling rigid annulus in the spring wheel completely encloses said rigid annulus, either by embedding or by enclosure in an annular chamber.

(1) Note. For similar arrangement of an annular rubber spring, see this class, subclass 48.

(2) Note. For similar devices wherein the spring encircling annulus is not rigid, see this class, subclass 200.