Fig. 337. - Strap Hinge.
Figs. 337 and 338. For doors hung in a frame it is generally necessary to use the T-hinge on account of the narrow edge of the frame. Where there is room to use the strap hinge, as for trap doors, it should be preferred.
Strap and T-hinges are made in sizes varying by inches from 3 to 14 inches for the length of each leaf of the strap hinge, or of the long leaf of the T-hinge, a 6-inch hinge being the smallest that should be used for a full-size door. They may be obtained in the plain iron, japanned or galvanized. Wrought hinges cannot be broken without first bending and tearing the iron, and where strength and resistance to rough usage are alone desired, they are preferable to butts. These hinges, however, are more frequently used on battened doors or very thin framed doors, where a butt hinge can not very well be used.
Fig. 338. - T-Hinge.
Besides the common strap and T-hinges, shown in Figs. 337 and 338, the Stanley Works make a patent hinge (Hart's Patent) which has two thicknesses of steel surrounding the pin, as shown in Fig. 339. It is claimed that this hinge has double the strength of the ordinary hinge. The Stanley Works also make corrugated hinges (Fig. 340), in which the metal is corrugated about the pin and also on the straps and around the screw holes, which greatly increases the strength of the hinge and prevents the metal from binding upon the pin. They are made of plain steel and with japanned, galvanized or bronzed finish, and also of wrought brass. They cost a little more than the cheapest wrought hinges and about the same as heavy plain hinges. This company also makes several patterns of ornamental corrugated hinges in both plated and polished wrought steel and in wrought brass, one pattern of which is shown in Fig. 341. These hinges have a very ornamental appearance, and may be used to advantage on finished work, more especially on cupboard doors, refrigerators, etc.
Single action spring hinges will be described in connection with screen doors.