. Electric locking . lose M, and would consequently open the cut-out. 71 ■ ELECTRIC LOCKING The only remaining chance for a false indication, which mightbe caused by a positive cross, introduced through a live wire fromsome other function, is prevented as follows: While the lever isin the reverse position, as indicated in dotted lines on lever con-tacts F, the contacts on safety relay Z are in the oppositeposition; that is, contacts U are open and conta:cts M switch in a corresponding position will have the reverse con-tact on indication selector T closed. Hence the indication wirew
. Electric locking . lose M, and would consequently open the cut-out. 71 ■ ELECTRIC LOCKING The only remaining chance for a false indication, which mightbe caused by a positive cross, introduced through a live wire fromsome other function, is prevented as follows: While the lever isin the reverse position, as indicated in dotted lines on lever con-tacts F, the contacts on safety relay Z are in the oppositeposition; that is, contacts U are open and conta:cts M switch in a corresponding position will have the reverse con-tact on indication selector T closed. Hence the indication wirewith the lever and switch in the reverse position will be con-nected with positive battery through magnets S, D and Ain series. As soon as the lever is placed normal, preparatory toa normal switch movement, the lever contacts will be closed, asshown in Fig. 66. This will immediately connect the indicationwire with battery negative, through reverse contact on T, wireR, contact F, and magnets B and C. This is the path. FIG. 67. which any positive battery from other functions introducedthrough a cross with the indication wire will take and therebyeffect the opening of the main circuit breaker (it will be notedthat the introduced current in this case flows through coil Conly) before the switch movement will have an opportunity torespond to the movement of the lever. Fig. 67 illustrates the lever and indication parts of the inter-locking machine in the normal position. The lock slide Lcarries two square dogs, A and B, which are free to movevertically but held in their raised position by the flat springs C,through the medium of retaining balls. The locking is effectedby the magnet heads G and H engaging with the pins D,E and F on the side of the lock slide. The reversal of thelever will move the lock slide L in the direction of the arrow,provided safety magnet head H is down so it will pass by pin 72 INDICATION LOCKING D, when dog A will strike plate J and dog B plate K,thereby forc
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu31, booksubjectrailroads
