. Electric locking . release the switch locks X through wireB, both switch locks being connected in multiple. The leverlock A which prevents the reversal of the lever unless theswitches and switch locks are in their proper position, acts asan indication to this effect and indirectly prevents the clearing ofsignal 1 until the route is completely safe. Lever contact D actsas a cross-protection contact for the switch locks. The front con-tacts on the switch locks and the reverse switch box contactsare used as a cross-protection for lever lock A when the switchor the switch lock is in an improper
. Electric locking . release the switch locks X through wireB, both switch locks being connected in multiple. The leverlock A which prevents the reversal of the lever unless theswitches and switch locks are in their proper position, acts asan indication to this effect and indirectly prevents the clearing ofsignal 1 until the route is completely safe. Lever contact D actsas a cross-protection contact for the switch locks. The front con-tacts on the switch locks and the reverse switch box contactsare used as a cross-protection for lever lock A when the switchor the switch lock is in an improper position for the energizationof the lever lock. The back points on the switch locks and thenormal contacts on the switch box are used for the energizationof the lever lock A. The tap on indication wire E can be em- 191 ELECTRIC LOCKING ployed for the control of signal 1 if this is power operated orcontrolled. In this way the signal will be provided with thesame amount of cross-protection as that given the lever FIG. 199. Fig. 199 shows an interlocked lever control of an electric lockplaced on a dwarf lever machine. This type generally has ahandle which can be turned only when the lock is unlocked whilethe handle will turn a commutator for the make and break of cir-cuits. This type of lock also usually has a miniature semaphorearm which acts as indication of the position of the lock arma-ture to the trainman. It will be noted that the control of theswitch lock is identical with the previous figure and that theindication and cross-protection is provided in a similar man-ner, insuring the lever lock and commutator being in the correctposition before the lever lock is released. Tower Instrument Control. Where no space in the inter-locking machine is available for the control of the outlyingswitches and where a more complete protection is desirable thanthat JDrocured with the use of a hand switch, tower instrumentsare employed. These are electrically locked and equipped witha
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu31, booksubjectrailroads
