US PATENT SUBCLASS 246 / 131
INTERLOCKING

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

131INTERLOCKING {8}
132  DF  .~> Electric actuation {2}
139  DF  .~> Fluid-pressure actuation {2}
143  DF  .~> Manual actuation {3}
159  DF  .~> Detached locking, check locking, or key control
160  DF  .~> Approach locking
161  DF  .~> Retarded-release mechanism
162  DF  .~> Switch or signal indicators
163  DF  .~> Derails

DEFINITION

Classification: 246/131

(under the class definition) Subject matter having means for actuating switches, signals, locks, derails, and similar independently-movable units of this class in such manner as to insure predetermined sequences of operation so far as they may be needed to restrain the movement of all other devices which, if actuated, would give rise to a condition of danger.

SEE OR SEARCH THIS CLASS, SUBCLASS:

25, 26 and 106, for locking in connection with block systems.

253, for switch or signal actuated controllers in which a plurality of circuits are closed or broken by the movement of the switch or signal and in which a predetermined sequence of operations is sometimes provided for.

401, for switch stands having rail lock and position indicating means.