Builder's hardware; a manual for architects, builders and house furnishers . rlowered. Sash-pulleys are usually made in live sizes: 1J inch. 2. 2J,2^ and 3 inches, the size referring to the diameter of thewheel. The two-inch wheel is sufficientlylarge for most cases, but for heavy, plate-glass windows larger sizes are used, thoughthe chief advantage of a large pulley isnot so much that it will wear better, butthat it will throw the sash-cord fartheraway from the hanging-style, and so per-mit of larger sash-weights, When theexpense is not an item to be considered inthe selection, it is well to
Builder's hardware; a manual for architects, builders and house furnishers . rlowered. Sash-pulleys are usually made in live sizes: 1J inch. 2. 2J,2^ and 3 inches, the size referring to the diameter of thewheel. The two-inch wheel is sufficientlylarge for most cases, but for heavy, plate-glass windows larger sizes are used, thoughthe chief advantage of a large pulley isnot so much that it will wear better, butthat it will throw the sash-cord fartheraway from the hanging-style, and so per-mit of larger sash-weights, When theexpense is not an item to be considered inthe selection, it is well to employ someform of anti-friction, ball or pin bearingpulley for all sash weighing over fiftypounds. A poor pulley will soon wearloose so as to rattle on the axle. If anti-friction wheels are not advisable, the nextbest form is one with a large gun-metalaxle. Some compositions of phosphor-bronze would seem to be peculiarly wellsuited for pulley axles, though not at present in the market toany extent. There are a great many varieties of sash-pulleys, though the Chapter Fig. 163. Anti-friction Sash-pulley. Moore Mfg. Co. Sash Pulleys. 110 BUILDERS HARDWARE. chapter vn. differences are so slight that a few examples will serve toillustrate the whole. Figure 162 is a fair type of the ordinaryaxle-pulley, and Figure 163 is a type of the best form of anti-friction sash-pulley. All of the most commonly used formsof sash-pulleys are on essentially one or the other of these only important deviations from the common types of sash-pulleys have been made with a view to reducing the amount oflabor required to properly set the fixtures in the window should be said that none of the patent forms have thus farmet with either very wide sales or general approval, whichwould seem to indicate that the common form answers prettyfully all the requirements of the case. There are, however, styles which have met with considerable favor in themarket, and which will serve to
Size: 1036px × 2412px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookidbuildershard, bookyear1890
