US PATENT SUBCLASS 305 / 147
.~.~.~ Coil spring housed within hydraulic cylinder

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  DF  .~.~ Including spring device (e.g., coil spring) {1}
147.~.~.~ Coil spring housed within hydraulic cylinder

DEFINITION

Classification: 305/147

Coil spring housed within hydraulic cylinder:

(under subclass 146) Apparatus wherein the resilient element is operatively installed inside the casing of the tubular fluid chamber.

SEE OR SEARCH CLASS

188, Brakes,

305, for an inertia-resistance motion retarder having a piston reciprocating along the axis of oscillation; subclasses 282.8+ for a thrust member reciprocating in the enclosed chamber.

254, Implements or Apparatus for Applying Pushing or Pulling Force,

10.5, for a metallic spring stretcher or compressor (e.g., leaf, helical, or coil spring).

267, Spring Devices,

34, for a compound coil and fluid pressure spring; subclass 221 for a fluid retarder having a helical coil spring.