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2,931 · Green · "Glass Lights for Street Vaults, Ships, &c." · Page 4 Home  > Prism Glass  > Patent Index  > Page 4

2,931: 4 of 8

4 A.D. 1856.--Nº 2931. Specification Green's Impts. in Manufacturing Glass Lights for Street Vaults, Ships, &c. w, a moveable collar, with set screw, to adjust the depth the ladle is to go into the pot; z, a sliding ring to which the chain or rod is fastened. q, q, Fig. 6, are curved bars, fastened at w, w, to the bracket h. Fig. 8 exhibits the bracket attached to the framework or beams above. The bracket h, Fig. 7, slides upon the bars q, q, and supports the railroad n, n, and permits it to be moved opposite any of the pots in the furnace; x, x, a casting plate.     The frames for vault lights and fiction boxes are made with a groove or projection at c, for the purpose of holding the glass firm in its place previous to putting the glass into the frame. The frame is put into a kiln or furnace and heated (I prefer a dull red heat) for the purpose of expanding the frame, then the frame is taken from the kiln or furnace and put upon the casting plate. The glass is then taken out of the pot (either gathered or ladled) in as hot a state as is convenient, and put into the frame, remaining until the glass becomes sufficiently solid to be removed into the annealing kiln. The glass may be put into the frames in the kiln, but I prefer it being put in the frame upon the plate. Glass put into cold frames is chilled and breaks and is also loose in the frame; but, on the contrary, when the frames are heated, and the molten glass run in and allowed to cool together in the annealing kiln, the frame binds the glass and gives great strength and solidity to the glass, making a a suitable article for vaults, decks, walls, &c., where light, strength and durability are desirable; the metal frames can be secured in their places by suitable device, and if desired can be ventilated, as seen at i, i,, Fig. 4, by drilling or casting holes in the frames.     Another advantage of my improvements is, the glass can be made of any desirable shape or pattern without fitting or glazing.     The antifriction properties of glass has long been known, but not generally brought into use for heavy machinery, from the difficulty of fastening the glass in the boxes. This difficulty is overcome by this Invention, the glass being put into the iron or metal frame in a molten state, the frame and glass being annealed and cooled solidify together, the frame serving as an external protection to the glass which the revolving shaft works upon the glass, requiring but little lubrication.     In the arrangement for ladling glass, the bracket h, Fig. 8, can be fastened to the ordinary supports of the roof, or to framework put up especially for it. The curved bars q, q, are used when the railroad n, n, is required to be moveable.     Fig. 7 shows the working arrangement of the sliding bracket h, in connection with the rail n, n, and flanged pulley m. The hook u fits upon the