. Electric locking . gnet and prevent an indication. Electro-Mechanical Interlocking. In electro-mechanicalinterlocking (the Post System) the switches are manually oper-ated by a mechanical interlocking lever located in a regular 64 INDICATION LOCKING interlocking frame, and electrically controlled by an electric leverplaced above the former. Each mechanical switch throwing leverhas a mechanical lock between it and its electric controlling lever,the locking being so arranged that the controlling lever must bethrown to its middle position, thereby effecting the unlocking ofthe mechanical switch
. Electric locking . gnet and prevent an indication. Electro-Mechanical Interlocking. In electro-mechanicalinterlocking (the Post System) the switches are manually oper-ated by a mechanical interlocking lever located in a regular 64 INDICATION LOCKING interlocking frame, and electrically controlled by an electric leverplaced above the former. Each mechanical switch throwing leverhas a mechanical lock between it and its electric controlling lever,the locking being so arranged that the controlling lever must bethrown to its middle position, thereby effecting the unlocking ofthe mechanical switch throwing lever, which can then be the switch lever has been thrown and latched, and afterthe switch is in a corresponding position and locked, then onlycan the stroke of the electric lever be completed, which in turnlocks the mechanical lever. A circuit for a switch movement is shown in Fig. 58, and theswitch lever partly reversed will unlock the switch throwing I— L et/er roJJen Confacfs on FIG. 58. lever by the withdrawal of lock rod C, which rested in a notchin the horizontal rod D. The reversal of mechanical lever Ewill cause the reversal of the switch, which again will cause theclosing of contact F, thereby completing the reverse indicationcircuit. Current will flow through contact F, wire 1, contacton electric lever, wire 2 and indication magnet to battery nega-tive. This will permit the full reversal of the electric lever which,,through the lock rod C, will lock the mechanical lever, the lockrod then entering notch G. The same operation is performedwith the throwing of the switch normal, when contact H at theswitch will close the normal indication circuit. 65 ELECTRIC LOCKING Polarized Switch Indication. On railroads where only themost up-to-date developments in signal devices and schemes areinstalled the check on the position of a switch, as obtained withthe use of F. P. L. (see electric bolt lock in Chapter V), is notconsidered sufficient. He
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu31, booksubjectrailroads
