Fig. 107
84. Chain Door Fastener.—The type of chain fastener illustrated in [Fig. 107] is generally used on exterior residence doors. This device allows the occupants to open the door partly without permitting entrance. It consists of a heavy chain, one end of which is attached to a plate, which in turn is fastened to the jamb with screws. The other end of the chain carries a ball or a hook that may be inserted in the slot of the long plate, which is attached to the door. By this means, the door may be opened only slightly, until the ball of the chain is released from the slot.
Fig. 108
Fig. 109
85. Door Bolts.—A large variety of door bolts is now on the market. These bolts are made in all sizes, in wrought steel, cast iron, brass, and bronze, and may be procured in any finish desired. The several types of bolts used in common practice are illustrated in Figs. [108] and [109]. In Fig. 108 (a) is shown a type of barrel bolt; at (b) is shown what is known as a cased bolt; and at (c) is shown a necked bolt. [Fig. 109 (a)] shows a spring bolt, (b) a spring-necked bolt, and (c) a type of shutter bolt. Various types of mortise bolts are illustrated in [Fig. 110].
