US PATENT SUBCLASS 305 / 149
.~.~ With vent or relief valve


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}
149.~.~ With vent or relief valve


DEFINITION

Classification: 305/149

With vent or relief valve:

(under subclass 145) Apparatus including an aperture or a membranous element to allow the pressurized fluid to escape at a controlled rate from the hydraulic tensioning device.

SEE OR SEARCH CLASS

91, Motors, Expansible Chambers Type,

168, for the control of a motive fluid for a one working member in response to the position of the second; subclasses 449+ for a motive fluid valve including plural separately controlled waste passages for a single working member.

137, Fluid Handling,

596+, for a supply and exhaust fluid handling systems; subclasses 599+ for a system dividing into parallel flow paths with recombining. [figure] [caption]A - Cross plate; B - Track adjusting cylinder; C - Piston seal; D - Piston; E - Discharge opening; F - Piston chamber; G - Piston chamber floor; H - Safety or relief valve; J - Body sleeve; K - Integral head;L - Axial inlet passage; M - Side part; N - Ball forms second valve element