| Fig. 233. |
| a. Butt-hinge. |
| b. Tee-hinge. |
| c. Chest-hinge. |
| d. Table-hinge. |
| e. Blank or Screen-hinge. |
The knuckle of the hinge is the cylindrical part that connects the two leaves, Fig. 234. The "acorn" is the head of the "pintle" or pin that passes thru the knuckle. Sizes of butts are indicated in inches for length, and as "narrow," "middle," "broad" and "desk" for width. The pin may be either riveted into the knuckle as in box-hinges or removable as in door-butts. Sometimes, as in blind-hinges, the pintle is fastened into one knuckle, but turns freely in the other.
| Fig. 234. Parts of a butt-hinge. |
| 1.1. Leaves. |
| 2.2.2. Knuckle. |
| 3. Pintle. |
| 4. Acorn. |
A butt-hinge may be set in one of three positions, Fig. 235: (1) Where it is desired to have the hinge open as wide as possible, as in a door. Here the knuckle is set well out from the wood. (2) Where it is desired to have the hinged portion open flat and no more. Here the center of the pin is in line with the outside surface of the wood. This is less likely to rack the hinge than the other two positions. (3) Where it is desired to have the knuckle project as little as possible.
Fig. 235. Three Positions of Hinges.
HINGING
In setting the hinges of a box cover, first see that the cover fits the box exactly all the way around.
In the case of a door, see that it fits its frame, evenly all the way around, but with a little play. To insure a tighter fit at the swinging edge this edge should be slightly beveled inwards.