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458,854 · Mark · "Glass for Light-Transmitting and Ventilating" · Page 2 Home  > Prism Glass  > Patent Index  > Page 2

488,122: 2 of 3

the body A or jacket, or both of them, with the desired material before such parts are screwed together.     Instead of threading all or nearly all of the lens body and jacket, the screw thread or threads can be made to extend over only a portion thereof, the rest being made plain.     By making my lens with its parts constructed and arranged as shown and described I am enabled to use a jacket which can be made complete before being applied to the glass body, and it needs no spinning or forcing in of any of its parts to fasten it securely to said body or make it hold the latter most tightly and securely.     Where, as I prefer, the jacket is made of sheet metal corrugated to produce the ribs and depressions necessary to engage the threads of the body A, its outer side will afford the best and surest hold for the cement D, which is to be used in the ordinary way to secure the lens in the tile-frame, part of which is shown at E in Fig. 2. Inwardly-projecting portions of the surrounding cement interlock with the outwardly-projecting parts of the jacket, so that the strongest hold and the most perfectly water-tight joint between the cement and jacket is secured. The interlocking threads on the inner face of the jacket and periphery of body A could also be made to fit or engage each other so tightly that a good water-tight joint could be secured; but I prefer to use the thin layer of white or red lead or cement, in order to make certain that no moisture can get down around the glass, even if the fit of the jacket should not be absolutely perfect at all points.     Having thus described my invention, what I claim is--     1. A lens for illuminating-tiles, vault-covers, &c., having the screw-threaded glass body and a jacket separate from the plate or frame for supporting the lens and screwed upon the portion of the lens-body to be surrounded by the holding-cement on the frame, substantially as and for the purpose specified.     2. A lens for illuminating-tiles, vault-covers, &c., having the screw-threaded glass body,

a jacket screwed thereon, and a layer of waterproof material between the jacket and body filling the opposing threads on the jacket and body, substantially as and for the purpose shown.     3. A lens for illuminating-tiles, vault-covers, &c., having the screw-threaded body, a projecting base, and a jacket screwed upon the body, substantially as and for the purpose set forth.     4. A lens for illuminating-tiles, vault-covers, &c., having the screw-threaded body, a projecting base, and a jacket screwed upon the body, provided with a projecting lip or flange on its lower end, substantially as and for the purpose described.     5. A lens for illuminating-tiles, vault-covers, &c., having the screw-threaded body and the jacket screwed thereon having at its upper end a portion extending in over a portion of the body, substantially as and for the purpose specified.     6. A lens for illuminating-tiles, vault-covers, &c., having the screw-threaded body provided with a rabbet around its upper end and the jacket screwed upon such body, having the inturned lip to enter the rabbet, substantially as and for the purpose shown.     7. A lens for illuminating-tiles, vault-covers, &c., having the screw-threaded glass body and the jacket around the latter corrugated to engage the threads on the body and leave projecting ribs and grooves on its outer side, substantially as and for the purpose set forth.     8. A lens for illuminating-tiles, vault-covers; &c., having the screw-threaded body, the jacket of thin material corrugated to engage the thread or threads on the body, and a coating or layer of waterproof material between the opposing surfaces of jacket and body, substantially as and for the purpose described.     In testimony that I claim the foregoing I have hereunto set my hand this 8th day of June, A. D. 1892. JACOB JACOBS. Witnesses:     WARREN C. STONE,     HENRY C. HAZARD.