US PATENT SUBCLASS 246 / 141
.~.~.~ Return-release indication

Current as of: June, 1999
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246 /   HD   RAILWAY SWITCHES AND SIGNALS

131  DF  INTERLOCKING {8}
139  DF  .~ Fluid-pressure actuation {2}
140  DF  .~.~ Electrically controlled valve {1}
141.~.~.~ Return-release indication

DEFINITION

Classification: 246/141

(under subclass 140) Subject matter in which the actuating lever or device is prevented by electric locks from completing its movement and thereby unlocking the other device which it controls, until the actuated unit is in full normal or reverse position, whereupon a return-release-indication current is sent back, unlocking the actuating-lever and permitting or effecting the completion of its movement.

SEE OR SEARCH THIS CLASS, SUBCLASS:

135, 137, 138, and 142, for return-release indication.

222, for return-indication-current generation.

257, see search notes appended thereto, for fluid-pressure-motor structure.