Builder's hardware; a manual for architects, builders and house furnishers . tened respec-tively to the jamb and the the door is opened, the endsof the spring are forced apart, but atthe same time the spring forces itselfout of centre, turning on the hooksof D, D. until, when the door hasmoved through 180 degrees, it isevident that the spring has bothmoved and turned so that the endstend to draw the arms D, D togeth-er, rather than to push them apart. In order that the springs shouldbe free to move, as just explained,the hinge-pins cannot extend throughthe butt, and the strength depe
Builder's hardware; a manual for architects, builders and house furnishers . tened respec-tively to the jamb and the the door is opened, the endsof the spring are forced apart, but atthe same time the spring forces itselfout of centre, turning on the hooksof D, D. until, when the door hasmoved through 180 degrees, it isevident that the spring has bothmoved and turned so that the endstend to draw the arms D, D togeth-er, rather than to push them apart. In order that the springs shouldbe free to move, as just explained,the hinge-pins cannot extend throughthe butt, and the strength depends en-tirely on the flanges of the plates to which the pins areattached. As these cannot be made very large without render-ing the hinge clumsy in appearance, it follows that the hingescan be used only for comparatively light doors. The Hero hinge is rather neater and apparently simpler in construction,and also has the advantage of having the hinge cased, thoughall the hinges are on essentially the same principle. The metal used for the springs in connection with double-. Fig. I I 5. HINGES. 75 acting butts, is usually steel, in which case it is advisable thatthe spring should be nickel-plated, to guard against is the best and most durable material to use,all things considered, though we are unable to state any-particular hinge in which it is employed. Some compositionsof brass, bronze, etc., are used with varying success. Thedifferent hinges are generalty made with but one kind of springthroughout, so that a choice in the metals is implied in a choiceof a hinge. The metal is, however, nearly always steel, as juststated. TABLE OF SPRING-HINGES. — RETAIL PRICE PER PAIR. Chapter V. Fig. 99100101102103104105106107108109 110 111112113114 Name. Garden City single-acting City single-acting Keenes saloon-door binge Garden City double-acting spring-butt. Empire spring-hinge Star spring-binge Crown spring-hinge Chicago double-acti
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