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11,072 · Basquin · "Improvements in Vault Lights or Prism Tiles" · Page 1
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Nº11,072 British Patent Office seal A.D. 1897 First: D26,829 · Basquin · "Design for a Prismatic Window-Light" · Page 1 Last: D27,969 · Basquin · "Design for a Prism-Light" · Drawing Prev: D26,988 · Basquin · "Design for a Prism-Light" · Page 1 Next: D27,323 · Basquin · "Design for a Prism-Light" · Page 1 Navigation
Olin H. Basquin
5 of 28
Date of Application, 4th May, 1897--Accepted, 3rd July, 1897

COMPLETE SPECIFICATION

Improvements in Vault Lights or Prism Tiles

    I, OLIN HANSON BASQUIN, of No. 1410 Marquette Building, Chicago, County of Cook and State of Illinois, United United States of America, Gentlemen, do hereby declare the nature of my invention, and in what manner the same is to be performed, to be particularly described and ascertained in and by the following statement:--

    My invention relates to vault lights for diffusing and distributing the light and has for its object to provide a new and improved lense or device for this purpose illustrated in the accompanying drawings, wherein
    Figure 1 is a section through a lense or vault light embodying my invention;
    Figure 2 is a section through a modified form of my service;
    Figure 3 is a section through a further modified form of my device;
    Figures 4, 5, and 6 are sections through devices similar to those shown in Figures 1, 2 and 3 and adapted to be used in places where the exposed surface instead of being horizontal is at an angle to the horizontal.
    Like letters refer to like parts throughout the several figures.
    There is a number of vault lights, all of which, to some extent at least, accomplish the purpose desired. Many of these devices have been provided with prisms, having straight refracting or reflecting surfaces. These vault lights are ordinarily placed so that the light is thrown in lines approximating the horizontal. The rear prisms, therefore, are obstructed by the prisms in front and a large amount of the light is lost. The object of my invention is to form a device which will throw the light as nearly horizontal as practicable, and still allow it to pass by the prisms without being obstructed thereby, thus avoiding the loss of light ordinarily occurring. I have found that the device herein illustrated approaches this result as near as it is practicable to do so. The several constructions herein shown all approximate this result by similar means.
    Referring now to Figure 1, which shows a body portion A provided with the projecting parts or prisms B, I have found that if the reflecting surface C is curved in a manner similar to that shown, that is, if it is a convex curve, the rays of light falling on the receiving surface D and passing through the prism, will be reflected and refracted so as to clear the prism next adjoining as show, the rays of light after leaving the prism being thrown in as nearly horizontal lines as is practicable. The curve given to this surface depends, of course, upon the several conditions and I, therefore, do not wish to limit myself to any particular curve, the only limitation being that is shall be curved.
    Referring now to Figure 2, I have shown a construction for obtaining the same result when the reflecting surface C is straight. In this case the refracting surface E is curved, such surface being given a convex curve as shown.
    In Figure 3 I have shown a construction wherein two curved surfaces are used, the reflecting surface C and the refracting surface E both being curved. In this construction both curves act to change the direction of the rays of light so as to make them leave the prisms in as nearly horizontal lines as is practicable and still have them pass below the adjoining prism or lense.