CARD TRANSLATOR FOR NATIONWIDE DIALING 1087 



CARD SUPPORT BAR LIFT MAGNETS 



It is possible that a translator may be equipped with a group of cards 

 from which all tabs except a very small number common to the group 

 have been removed from one side. To select any card of the group 

 all of the code select bars associated with the remainder of the tabs 

 on the side involved have to be operated. Under these conditions the 

 unselected cards of the group would be unsupported on one side and 

 would, therefore, tilt to the extent permitted by the card guide bar work- 

 ing clearances that prevail. The closest practicable clearances have been 

 established and yet, insofar as the card guide bars are concerned, the 

 lower corner of the cards would be free to drop approximately 0.015" 

 below the nominal bottom surface of the card stack. The combined 

 weight of the tilted cards could be more than the associated code select 

 bars can support; therefore, these bars would be depressed shghtly. 

 Actually they could be depressed sufficiently to interfere with the in- 

 tended free action of the latches when they are called upon to operate 

 and release for restoral of the translator to normal. This could happen, 

 despite the fact that the powerful pull-up magnet would be energized 

 at this time, because the flux shunting action of the adjacent and higher 

 cards reduces the pull on the tilted cards to a very small value. The high 

 cards in rising decrease the chances of the tilted cards following. There- 

 fore, supplementary magnets have been provided that assist the retractile 

 springs of the card support bars in lifting the tilted cards. These magnets 

 are powerful enough (6.6 lbs.) to straighten up the tilted cards. 



The form of these magnets, which have been called card support bar 

 lift magnets, is illustrated in Fig. 34. It will be noted that, like the 

 latches, they are constructed as units to permit convenient servicing in 

 the field. Two coils are used for each magnet because in this way standard 

 comparatively small diameter coils can be used and thus the magnets 

 may be mounted more readily in the space available. 



214a SELECTOR 



All of the dynamic components, that is, the code select and card sup- 

 port bars, the solenoids, the latches, the card support bar lift magnets 

 and the off-normal contacts are combined in a subassembly that is ar- 

 ranged on a plug-in basis. This combination, which as a convenience 

 includes the pull-down magnet and of necessity many supporting de- 

 tails, is illustrated by Figs. 30 and 32. It is manufactured as the 214A 

 selector but commonly is called the dynamic unit. It may readily be 

 removed from a translator and placed on a portable elevator table su(;h 



