US PATENT SUBCLASS 180 / 193
.~.~.~ With vertically movable track support located intermediate the forward and rearward extremities of the track

Current as of: June, 1999
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180 /   HD   MOTOR VEHICLES

182  DF  INCLUDING ONE OR MORE SKI-LIKE OR RUNNER MEMBERS {2}
186  DF  .~ With at least one surface-engaging propulsion element {6}
190  DF  .~.~ Endless track type element {3}
193.~.~.~ With vertically movable track support located intermediate the forward and rearward extremities of the track

DEFINITION

Classification: 180/193

With vertically movable track support located intermediate the forward and rearward extremities of the track:

(under subclass 190) Vehicle provided with a belt or chain supporting device which is situated between, and is vertically movable relative to at least one of, the end wheels.

(1) Note. "Support", as used herein, is not limited to a force exerted in opposition to gravity; rather, it encompasses any force applied by a vertically movable device to the inner surface of the belt or chain in a direction generally normal thereto.

SEE OR SEARCH THIS CLASS, SUBCLASS:

9.5, for a motor vehicle having a special driving device in the nature of a portable track and wherein the track is of the endless, flexible type and further wherein a support, which is vertically movable, is provided for the track.

SEE OR SEARCH CLASS

305, Wheel Substitutes for Land Vehicles,

141, for a wheel substitute in the nature of an endless track, and wherein the track is provided with a vertically movable supporting means intermediate its run.