US PATENT SUBCLASS 446 / 464
.~.~ Flat spiral or torsion spring

Current as of: June, 1999
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446 /   HD   AMUSEMENT DEVICES: TOYS

431  DF  ROLLING OR TUMBLING (E.G., WHEELED) {16}
457  DF  .~ Including intrinsic motive power means for propulsion {6}
464.~.~ Flat spiral or torsion spring

DEFINITION

Classification: 446/464

Flat spiral or torsion spring:

(under subclass 457) Device wherein the energy-storing means comprises either (1) an elastically deformable element curved into a planar spiral, or (2) an elongated elastically deformable element which is caused to store energy by rotating one end relative to the other about the longitudinal axis of the element or a helix formed thereby.