Builder's hardware; a manual for architects, builders and house furnishers . practically proof against any but the most expert external appearance of the Yale lock is presumablyfamiliar to every one, but the internal construction will requiresome explanation. Figure 336 shows a cross and a longitudinal section throiidia typical Yale escutcheon, together with the exposed face ofthe same. It will readily be seen that the action of themechanism is very simple. There are two barrels or cylinders,one rotating within the other, but eccentric with it. When Chapter XL Yale Patent. Yal
Builder's hardware; a manual for architects, builders and house furnishers . practically proof against any but the most expert external appearance of the Yale lock is presumablyfamiliar to every one, but the internal construction will requiresome explanation. Figure 336 shows a cross and a longitudinal section throiidia typical Yale escutcheon, together with the exposed face ofthe same. It will readily be seen that the action of themechanism is very simple. There are two barrels or cylinders,one rotating within the other, but eccentric with it. When Chapter XL Yale Patent. Yale Mechan-ism. ^14 BUILDERS HARDWARE. Chapter xi. the key is withdrawn the lower cylinder is held from rotatingby means of five sets of round pins which are fitted in verticalgrooves extended partially through the two cylinders, andpressed constantly downward by five spiral springs. In eachgroove are two pins of unequal lengths, one over the the proper key is inserted all the pins are raised simul-taneously, but to varying heights, so that the joints between the. Fig, 336. Mechanism of the Yale Lock. Yale & Towne Mfg. Co. upper and the lower pins are brought exactly on a line witheach other. It is evident that as the inner cylinder, categor-ically designated as the plug, is exactly fitted to the bore in theshell, an almost imperceptible variation in the height to whichany one of the pins is raised, will prevent the plug from turn-ing ; whence it follows that an immense number of locks canbe made with such mechanism without duplication. From thisresults the unrivalled capacity of the Yale lock for permuta-tions, with its proportionate safety against any accidentalinterchange of keys. It will be seen that in this lock the key acts only as anadjuster of the pins. Motion is communicated to the locking-bolt of the lock simply by means of a hub on the back of therotating plug, or, in the case of a rim-lock, by a fiat keyextending from the plug through the door. Some of theo
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Keywords: ., bookcentury1800, bookdecade1890, bookidbuildershard, bookyear1890
