US PATENT SUBCLASS 305 / 152
.~.~ Longitudinally outwardly biased by coil spring only

Current as of: June, 1999
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305 /   HD   WHEEL SUBSTITUTES FOR LAND VEHICLES

143  DF  WITH MEANS FOR TENSIONING TRACK BY MOVING AT LEAST ONE ENDWHEEL {7}
151  DF  .~ Biased by spring only {1}
152.~.~ Longitudinally outwardly biased by coil spring only

DEFINITION

Classification: 305/152

Longitudinally outwardly biased by coil spring only:

(under subclass 151) Apparatus including a movable wheel mounted on a transverse axle movable in the direction away from the direction of travel and is acted upon by a spiral elastic element used as a source of power for tensioning the track.

SEE OR SEARCH THIS CLASS, SUBCLASS:

44, for a steerable track or tread.

SEE OR SEARCH CLASS

267, Spring Devices,

70+, for an elastic extension device such as a compression spring.

403, Joints and Connections,

83+, for an articulated member lockable at a fixed position. 464, Rotary Shafts, Gudgeons, Housings, and Flexible Couplings for Rotary Shafts,

49, for a coupling device including an endless chain engaged with circumferential teeth on coupled members. [figure] [caption]A - Endless resilient band; B, C - Supports for roller; D - Terrain (ground surface); E - Shaft; F - Radial flanges; G, H - Load rollers; J - Idler roller; K, L - Floating end rollers on swingable arms; M - Coil spring mechanism; N - Radial flanges