Builder's hardware; a manual for architects, builders and house furnishers . pulley/A used by builders are those whichare employed for double-hangingwindows. These are made with cast-iron frames for the cheaper styles ofwork, or frames of malleable iron fora better class of goods; while somemanufacturers use wrought-iron en-tirely. The wheels are usually madeof cast-iron, with a groove shaped toreceive the sash-cord or chain. Thepulley is fitted in a mortise cut intothe face of the hanging-style of thewindow-frame, and the part visible, orthe face, is made of almost any ma-terial, but most oft
Builder's hardware; a manual for architects, builders and house furnishers . pulley/A used by builders are those whichare employed for double-hangingwindows. These are made with cast-iron frames for the cheaper styles ofwork, or frames of malleable iron fora better class of goods; while somemanufacturers use wrought-iron en-tirely. The wheels are usually madeof cast-iron, with a groove shaped toreceive the sash-cord or chain. Thepulley is fitted in a mortise cut intothe face of the hanging-style of thewindow-frame, and the part visible, orthe face, is made of almost any ma-terial, but most often of bronzed,nickel-plated, painted or japanned iron. The commonest formis bronzed iron. The axles of the wheels are of steel orgun-metal, and the wheels themselves, in the better classof goods, are turned to accurate dimensions, though somecheaper grades are simply cast and polished. Some manufac-turers finish pulleys with plain or ornamented bronze faces,in which case the face is made of a separate piece of metal,riveted to the iron frame of the pulley. There are also. 162. Ordinary Axle-pulley. PULLEYS. 109 in the market, a few flue grades of pulleys made with brasswheels and cast-brass frames. This is, however, a needless ex-pense, and such pulleys are used more in connection withfurniture than with building. The essential qualities of a good pulley-wheel, are simplythat it shall run lightly, smoothly and easily. There should bea broad hub on the axle in order to prevent the flanges fromjarring or rattling against the pulley frame, and the wheelsselected should be of such a size that when the face-plate ismortised-in flush with the face of the hanging-style, the inneredge of the wheel will be over the centre of the box, so thatsash-weights will not strike against the frame when raised orlowered. 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,
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Keywords: ., bookcentury1800, bookdecade1890, bookidbuildershard, bookyear1890
