Builder's hardware; a manual for architects, builders and house furnishers . d in anjupper story a catch in thelock is drawn hy the action ofan electro-magnet, permittingthe lock or latch to he form of lever-lock mightbe adapted to this purpose,but there are a few forms ofspecially designed electriclocks which are more commonlyused. Properly speaking these are all electric-latches, as noneof them have a locking bolt. Figure 345 illustrates Thax-ters electric lock. The pressure of a button closes thecircuit through the electro-magnets, A. These act on thebent lever so as to release th
Builder's hardware; a manual for architects, builders and house furnishers . d in anjupper story a catch in thelock is drawn hy the action ofan electro-magnet, permittingthe lock or latch to he form of lever-lock mightbe adapted to this purpose,but there are a few forms ofspecially designed electriclocks which are more commonlyused. Properly speaking these are all electric-latches, as noneof them have a locking bolt. Figure 345 illustrates Thax-ters electric lock. The pressure of a button closes thecircuit through the electro-magnets, A. These act on thebent lever so as to release the arm, B, from its catch on spring at 0 draws hack F and D from the follow, E. Theoutside knob can then be turned and the door opened. Whenthe latch is drawn hack by closing the door, it carries with it thearm F, which resets itself so that the bolt D catches in the fol-low and locks the door. The latch is also fitted with a set oflevers, so it can he operated by a key, independently of theknob. Fullers electric lock, Figure 34G, is a trifle simpler. The Chapter Electric Lock. Thaxter Electric Lucks. 228 B UILDERS HA RD WA RE. Chapter XI. Sliding-Door Locks. magnets draw the armature A away from the cam, B, permit-ting the knob to be turned. When the door is closed the latch lifts the bent arm, C,and forces back the ar-mature under B. The Thaxter andthe Fuller locks arethe ones most com-monly employed in andaround Boston, thoughthere are several othermakes in the market,most of which are,however, asserted to beinfringements of thepatents. Sliding-door Lochs.— Figures 847 and 348illustrate two types ofsliding-door latch andlock. The lockingmechanism used forthis purpose is usuallyquite cheap in its con-struction, as a finelyfitted lock is seldomrequired for sliding-doors. Indeed in manycases no lock at all isnecessary. The bolt iscurved and hooksdown into the face-plate on the opposite door or on the door-pull is either in the form of a hinged-lever, as inF
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