[Fig. 200] shows a more complicated form of latch with a trigger protruding from the lower part of the door, which is hinged to a wooden shaft, and the shaft in turn is connected with the latch. The fastenings of the trigger to the shaft and the shaft to the latch are made with hardwood pegs or wire nails which move freely in their sockets. The latch is the simplest form of a wooden bar fastened at one end with a screw or nail on which it can move up and down freely; the other end is allowed to drop into the catch. The latch itself is similar to the one shown in Figs. [193] and [194]. The trigger is also fastened to a block on the outside of the door by a nail or peg upon which it moves freely, so that when the weight of the foot is placed upon the trigger outside the door that end is forced down which pushed the end attached to the shaft up; this pushes the shaft up and the shaft pushes the latch up; thus the door is unfastened. The diagram to the left in [Fig. 200] shows the edge of the door with the trigger on the outside, the shaft upon the inside. The diagram to the right in [Fig. 200] shows the inside of the door, the end of the trigger, the shaft, the latch, and the catch.
The Latch-String
In the preceding locks and fastenings, no matter how generous and hospitable the owner may be, his latch-string never "hangs on the outside," but in this one the latch-string literally hangs outside and any one may enter by pulling it (Figs. [193] and [194]). But when the owner is in and does not want to be interrupted he pulls the string in, which tells the outsider that he must knock before he can be admitted. This simplest form of latch has been here put upon the simplest form of a door, a door with a wooden hinge made by nailing a round rod to the edge of the door and allowing the ends of the rod to project above and below the door. In the sill log below the door a hole about two inches deep is bored to receive the short end of the hinge rod; above a deeper hole is bored to receive the long end of the hinge rod. To hang the door run the long end up in the top hole far enough to lift the door sufficiently to be able to drop the lower end of the hinge rod in the lower hole. Your door is then hung and may swing back and forth at your pleasure. Notwithstanding the fact that such a door admits plenty of cold air, it is a very popular door for camps and is even used for log houses.
[Fig. 193.] [Fig. 194.] [Fig. 195.] [Fig. 196.] [Fig. 197.] [Fig. 198.]
Foot and thumb door-latches.
Simple Spring-Latch
A simple form of spring-latch is shown by [Fig. 196], as you may see, A is a peg driven into the door-jamb. It has a notch in it's outer end so that B, a piece of hickory, may be sprung into the notch; B is fastened to the door by a couple of screws. By pushing the door the latch will slide out of the rounded notch and the door opens. When you pull the door to close it the end of the spring strikes the rounded end of the A peg and, sliding over it, drops naturally into the slot and holds the door closed. This form of latch is also a good one for gates.
