Builder's hardware; a manual for architects, builders and house furnishers . verse. Figure 288 shows a form which is made by afew manufacturers, being listed in the catalogue of both J. and the Nashua Lock Company. It consists simplyof a steel rocker attached by swivel pins to the bolt, the lowerpin passing underneath the shank of the bolt. When the dooris closed the latch, instead of moving straight back, swingson the lower edge of the rocker, being lifted from the lock-frame, and thus reducing the friction. The gain by thisdevice is, of course, less thanby the others previously de
Builder's hardware; a manual for architects, builders and house furnishers . verse. Figure 288 shows a form which is made by afew manufacturers, being listed in the catalogue of both J. and the Nashua Lock Company. It consists simplyof a steel rocker attached by swivel pins to the bolt, the lowerpin passing underneath the shank of the bolt. When the dooris closed the latch, instead of moving straight back, swingson the lower edge of the rocker, being lifted from the lock-frame, and thus reducing the friction. The gain by thisdevice is, of course, less thanby the others previously de-scribed. Yet another form ofso-called anti-friction strike ismade. Figure 289 shows thepattern adopted by Hall, ofBoston, for his. consists, essentially, of anadaptation of the well-knowncar-door latch, the latch-strikebeing hinged at the base andattached by a loose-pin to thelatch-shank at the top, whilethe face of the latch-strike isslightly curved. This devicemakes really a very efficientanti-friction strike. The only objection to it is that the wide. Fig. 289. Anti-friction Strike. Hall. 180 BUILDERS HARDWARE. Chapter XL. Right and LeftHand Locks, plate necessitated by it cuts the door a great deal, and manypersons clo not like it on that account. The custom in regard to latches varies in New York andBoston. In New York the outside knob is generally fixedfirmly so as not to move at all, while in Boston the knobsare arranged with a swivel spindle permitting either to beturned without acting upon the other, and the mechanism in-side of the lock is so devised that by pushing a button or aslide the outer knob can be held fast. In cheaper forms offront-door locks, the knob-spindle is made without a swivel,and security is obtained by a bolt on the inside. Locks are designated as being either right or left hand,though the distinction is one which is confined entirely to thelatch. A left-hand lock belongs to a door fitted with left-band hinges, as has been previo
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