Builder's hardware; a manual for architects, builders and house furnishers . Fig. 349. Wardrobe Lock. Newman. Fig. 351. Post-office Lock. CorbinCabinet Lock Co. MISCELLANEOUS LOCKS. key can be changed as often as desired. In case the key islost, an arrangement at the back of the lock permits the post-master to open the box and throw back the bolt, when a newkey can be used, without in any way changing the lock, andthe key which was lost would not then work the lock at , the bolt is so arranged that it will turn backonly sufficiently to permit the box to be opened, but not e
Builder's hardware; a manual for architects, builders and house furnishers . Fig. 349. Wardrobe Lock. Newman. Fig. 351. Post-office Lock. CorbinCabinet Lock Co. MISCELLANEOUS LOCKS. key can be changed as often as desired. In case the key islost, an arrangement at the back of the lock permits the post-master to open the box and throw back the bolt, when a newkey can be used, without in any way changing the lock, andthe key which was lost would not then work the lock at , the bolt is so arranged that it will turn backonly sufficiently to permit the box to be opened, but not enoughto allow the key to be withdrawn, unless the bolt is forcedback by external pressure. The working is as follows: Theupper levers are pivoted so as to permit of a rotary as well asa longitudinal motion. The second set of levers moves only. Fig. 3 51 A. E. Dietz. Fig. 353 Scandinavian & Erwin. laterally. The opposite edges of both sets of levers arenotched, the width of the notches corresponding to the differ-ence between the notches on the keys. Suppose the bolt to beunlocked: when the key is turned, the lower levers are firstpushed to one side varying distances, corresponding to thenotches of the key, and the upper levers are then drawn downand away from the jjost. As the key continues to revolve the levers interlock and thelower ones are forced sidewise by the springs, carrying withthem the pivoted upper levers, which rotate so that the slot in 231 Chapter XI.
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