Builder's hardware; a manual for architects, builders and house furnishers . stood. The letters refer to both figures. There are three dis-tinct sets of levers, A, B and C, each admitting of a sliding orlifting motion up and down, the levers A having springs whichkeep them pressed down, D, and the levers C being constantlyforced up by a spring of lesser strength E, so that the levers Owill always move up and down exactly as A are raised orlowered, the tops of C bearing against the bottom of exten-sions to A. The levers B have no springs, and slide up anddown between studs attached to a wing of
Builder's hardware; a manual for architects, builders and house furnishers . stood. The letters refer to both figures. There are three dis-tinct sets of levers, A, B and C, each admitting of a sliding orlifting motion up and down, the levers A having springs whichkeep them pressed down, D, and the levers C being constantlyforced up by a spring of lesser strength E, so that the levers Owill always move up and down exactly as A are raised orlowered, the tops of C bearing against the bottom of exten-sions to A. The levers B have no springs, and slide up anddown between studs attached to a wing of the bolt-tail, so that 180 BUILDERS HARDWARE. Chapter XI. when the bolt is shot, the levers B move with it. F is a dogor lever, which is hinged to a stud on the bolt at the top, ai_dhinged with a bent elbow attached to the lock-case at thebottom. On this dog, F, is a tooth, and on the edge of eachof the tumblers B are notches corresponding in mutual dis-tance with the difference in lengths of the movable bits of thekey. Furthermore, the levers A are each made with an arm. Fig. 296b. Perautopic Lock, shut. G which fits into a corresponding notch in the levers B, andthe levers B have each an arm H which exactly fits betweentwo arms on each of the levers C. Figure 296 shows the lockwith the bolt thrown, and Figure 2965, shows it drawn the key is turned in the lock, the bits, no matter in whatorder they may be arranged, lift the levers A. These, bymeans of the arms G and II, lift the other sets of levers inexactly the same proportion. The key then forces out thebolt, and the levers B are withdrawn from the arms G and H,but before the arms LI are entirely free from the arms on thelevers C, the notches on B are caught on the tooth of the dogF, the le, ers B being then held at exactly the relative heightsto which they were raised by the action of the key on levers key, continuing to turn, then allows levers A and O todrop to their original position, and the bolt is th
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Keywords: ., bookcentury1800, bookdecade1890, bookidbuildershard, bookyear1890
