Builder's hardware; a manual for architects, builders and house furnishers . JTKIKE. PEG FAJTEAiepTOLOCK CAJE- Chapter XI. Latch. Fig. 285. Compound Lev Fig. 286. Anti-friction Robinson. a shank inside the lock, about which is coiled a strong spiralspring, keeping the latch pressed out. The inner end of thelatch-shank is forked and hooks under each side of what istermed the follow, through which passes the spindle of thedoor-knob. Turning the knob either way draws back the objection to this arrangement is that while only a veryslight spring is really necessary to keep the l
Builder's hardware; a manual for architects, builders and house furnishers . JTKIKE. PEG FAJTEAiepTOLOCK CAJE- Chapter XI. Latch. Fig. 285. Compound Lev Fig. 286. Anti-friction Robinson. a shank inside the lock, about which is coiled a strong spiralspring, keeping the latch pressed out. The inner end of thelatch-shank is forked and hooks under each side of what istermed the follow, through which passes the spindle of thedoor-knob. Turning the knob either way draws back the objection to this arrangement is that while only a veryslight spring is really necessary to keep the latch in position,a pretty strong spring is required so that the knob shall 178 BUILDERS HARDWARE. Chapter XI. Easy Spring-latch. Anti-friction Strike. not turn too easily; otherwise, every time the door-knobis touched the latch will be opened. Consequently in thebetter class of work a door-latch is usually fitted with twosprings, one of which is operated when the latch is pushedback by the door being closed, while both springs are actedupon when the knob is turned. In this way th
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