US PATENT SUBCLASS 246 / 142
.~.~ 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}
142.~.~ Return-release indication

DEFINITION

Classification: 246/142

(under subclass 139) Subject matter in which the actuating lever or device is prevented by electric locks from completing its movement, and from thereby unlocking the other devices which it controls, until the actuated unit is in full normal or reversed 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 141, for return-release indication.

222, for return-indication-current generation.

257, see the search notes appended thereto, for

fluid-pressure-motor structure.