There is a wrought-steel hinge, known as the Stanley blind hinge, which has not the gravity-locking device, but which obtains a greater purchase on the shutter. This hinge is illustrated in [Fig. 29]; the hinge shown at (a) is for frame buildings, while that shown at (b) is arranged for brick walls.
Fig. 29
Another type of hinge made entirely of wrought steel, and known as the New York blind hinge, is shown in [Fig. 30]. This type of hinge has a long strap that extends on the top and the bottom rail of the shutter and thus tends to prevent the blind from drooping. This strap also strengthens the shutter by relieving the mortise and tenon of the rail and stile from the strain. The New York blind hinges are made in two styles. The hinge shown at (a) is intended for frame buildings, while that at (b) is made with an offset to throw the shutter clear of a brick jamb. These hinges are ordinarily used with blind adjusters, or fasteners, and for very high blinds, a center, or auxiliary, hinge is used.
Fig. 30
Fig. 31
There is another type of strap hinge similar to those just described, the butt of which consists of a pin and staple, as shown in [Fig. 31]. This staple is secured by driving it into wooden blocking in the brick joints. Hinges of this type are used extensively in localities where brick buildings are numerous.
31. Inside Blind, or Shutter, Hinges.—The use of inside blinds, or shutters, is general with the better class of domestic buildings, and for hanging these shutters, three kinds of hinges are used, depending on the number of folds in the shutter and the manner in which they fold back on each other. Usually, the butt and the back flap, as shown in [Fig. 32 (a) and (b)], are used. Where the shutter has three folds, however, a knuckle butt, as shown at (c), is employed. The purpose of the knuckle butt is to cause the folds to take such relative positions as will enable them, when open, to close properly into a pocket, or recess, formed in the window frame.