US PATENT SUBCLASS 74 / 501.5 H
.~.~.~.~ Hydraulic control

Current as of: June, 1999
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74 /   HD   MACHINE ELEMENT OR MECHANISM

469  DF  CONTROL LEVER AND LINKAGE SYSTEMS {8}
491  DF  .~ Hand operated {4}
500.5  DF  .~.~ Flexible transmitter (e.g., Bowden cable) {6}
501.5 R  DF  .~.~.~ Constant tension sustaining {1}
501.5 H.~.~.~.~ Hydraulic control

Unofficial Alpha Subclasses: R H

DEFINITION

Classification: 74/501.5

(under subclass 500.5) Devices comprising means for maintaining an established static stretch or pull in the flexible elements, effective upon change in said stretch or pull, for concurrently restoring the same to the established value.

(1) Note. Many of these devices correct the change in tension resulting from a change in elongation of either the flexible element and/or the system mounting, due to variations in temperature.

SEE OR SEARCH THIS CLASS, SUBCLASS:

586, for longitudinally adjustable piston rods.

SEE OR SEARCH CLASS

246, Railway Switches and Signals,

152+, for constant tension sustaining mechanism disclosed for use in interlocking, manually actuated, mechanically locking, railway switches and signals. 267, Spring Devices, appropriate subclasses, for spring devices, per se.

474, Endless Belt Power Transmission Systems or Components, particularly

101+, for a belt tightener.