US PATENT SUBCLASS 305 / 146
.~.~ Including spring device (e.g., coil spring)

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}
145  DF  .~ Having hydraulic adjusting means {3}
146.~.~ Including spring device (e.g., coil spring) {1}
147  DF  .~.~.~> Coil spring housed within hydraulic cylinder

DEFINITION

Classification: 305/146

Including spring device (e.g., coil spring):

(under subclass 145) Apparatus wherein the hydraulic piston is provided with an additional resilient means to maintain tension of the track and allow recoil thereof.

SEE OR SEARCH CLASS

91, Motors: Expansible Chamber Type,

449+, for a motive fluid valve with plural separately controlled waste passages for a single working member.

92, Expansible Chamber Devices,

26, for a resilient element to prevent movement of the working member; subclasses 61+ for relatively movable working members; subclass 84 for resilient means interposed between the working member and a relatively movable power transmission element; subclasses 153+ for a expansible chamber device with a lubricating means.

184, Lubrication,

18+, for a cylinder lubricator. 213, Railway Draft Appliances,

43, for a fluid spring.

267, Spring Devices,

64.11, for a vehicle spring with compressible fluid; subclasses 118+ for a expansible-contractible chamber device.

474, Endless Belt Power Transmission Systems or Components,

138, for a guide roll spring biased in the belt-tensioning direction. [figure] [caption]A - Endless track; B - Idler wheel; C - Axle; D - Idler boxings; E - Frame; F - Hydraulic piston-cylinder; G - Spring unit; H - Bracket; J - Hydraulic cylinder; K - Piston rod; L - Spring [figure] [caption]A - Track roller frame; B - Spring recoil assembly; C - Stop; D - Housing; E - Coil spring; F - Movable piston; G - Block closes piston at one end; H - Circular plate secured to piston block; (Shifting piston to the left compresses the coil spring)