. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . d then by a furthermovement to retract the latch. This arrangement gives I lie house-holder a single Yale key to operate both latch and dead bolts at anytime, rendering it impossible for him to be loeked out at night, andat the same time permits tlie house to be locked from within by a keywliich can not be used by any one to effect an entrance. The ar-rangement of parts will be understood by referring to Fig. 2. The
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . d then by a furthermovement to retract the latch. This arrangement gives I lie house-holder a single Yale key to operate both latch and dead bolts at anytime, rendering it impossible for him to be loeked out at night, andat the same time permits tlie house to be locked from within by a keywliich can not be used by any one to effect an entrance. The ar-rangement of parts will be understood by referring to Fig. 2. Thedead-bolt A is made with a double tail and two dogging-levers £Bconnected together by a link. When either of the escutcheon-plugsis rotated, the cam Con the end of the plug will depress its dog-ging-lever and enter the corresponding talon, thus moving tlic boltwitliout regard to the position of the other dogging-lever. Thelatch-liolt (r is operated by the bell-crank /, whiili is mounted onthe bolt, so that when the dead-bolt is shot the tail of the bell-erank is out of the way of thecam on the escutcheon ii(this being the escutcheon for tlio outside of the door), and hence.
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
