All of the hinges described are also made in plain steel, japanned or galvanized, and may have brass pins or rivets.
21. T Hinges.—As will be seen from [Fig. 13], T hinges are so called to distinguish them from the strap hinge, as well as because of their construction, which is in the form of the letter T. The T hinge is used for practically the same purpose as the strap hinge, but is superior to it in strength, from the fact that its knuckle is wider than that of the strap hinge. T hinges are made in light, heavy, and extra-heavy grades, the former and latter types being shown in [Fig. 13 (a) and (b)]. In arranging the sizes of T hinges, the measurements are given for the length of the strap only; the leaf of the hinge forming the T with the strap is not considered. Thus, a 6-inch T hinge measures 6 inches from the pin to the end of the strap leaf. T hinges may also be obtained in stamped metal, with corrugations, as shown at (c). These hinges can be had in all finishes. The light and heavy grades, as well as the 4- and 5-inch extra-heavy grades, are sold by the pair, while the larger sizes of extra heavy are sold by weight.
Fig. 13
22. Hinge Butts.—In the selection of hardware for building purposes, no other article deserves more consideration, and probably receives less, than the hinge butt. This type of hinge is used for the purpose of hanging all of the exterior and interior doors of buildings, and is usually secured to the edge of the door and to the hanging stile of the frame with screws, the greater part of the appliance being thus unobtrusive and partly hidden from view. The hinge butt supports the entire weight of the door, and, ordinarily, is constantly in use, so that it is subjected to excessive strain and considerable wear. It is evident, therefore, that great care should be exercised in selecting hinge butts, so that proper sizes and qualities suitable for the purpose intended may be obtained.
Fig. 14
23. Cast-Iron Hinge Butts.—Hinge butts made of cast-iron are used extensively in the cheaper class of buildings built for speculative purposes, in which cost is usually the controlling factor. An ornamental type of the cast-iron hinge butt is shown in [Fig. 14]. Butts of this type are not extensively used at present, but may be obtained in various finishes to imitate bronze or brass, and may likewise be obtained without ornamentation. As the genuine Bower-Barff finishes are produced with equal facility on iron or steel, a large number of the better grade of cast butts are finished in this manner.
While the cast-iron hinge butt is not so durable as the steel butt, being more easily broken when subjected to excessive stresses, it wears somewhat better at the joints, or knuckles, than the ordinary steel butt. Therefore, the extra-heavy types of cast-iron are becoming more popular for entrance doors, etc., where a good wearing butt is required, and where economy is the essential feature. The heavier grades of cast-iron butts can be procured with steel bushings inserted into the joints.
