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Olin H. Basquin
22 of 28
SPECIFICATION forming part of Letter Patent No. 586,223, dated July 13, 1897.
Application filed April 20, 1897. Serial No. 632,983. (No model.)
To all whom it may concern:
    Be it known that I, OLIN H. BASQUIN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented an Adjustable Prism-Canopy, of which the following is a description.
    My invention relates to a device for adjustably holding prism-canopies. These prism-canopies consist of comparatively heavy prism-lights assembled together to form a prism-plate, and this prism-plate is intended to be mounted outside the window or aperture through which the light is to be introduced. In the ordinary use of such a canopy it is evident that it must be moved in and out, or, in other words, folded against the window or projected therefrom. Moreover, it is very desirable that it be so constructed and mounted that it can be readily adjusted from time to time to vary its inclination and thus control to a degree its action. It is also highly desirable that such a prism-plate should be so mounted that when in actual use for introducing light it will leave a space at the upper part of the window for ventilation. Since in many instances the prism-plate is preferably of substantially the same length as the window, it will be seen that this necessitates mounting the prism-plate in such a way as to cause the upper end of the prism-plate to descend when the plate is extended. There are other features in a construction of this general nature highly important to be accomplished, and they will be hereinafter more fully referred to.
    My device is illustrated in the accompanying drawings, wherein—
    Figure 1 is an elevation of a prism-plate mounted and in a substantially vertical position. Fig. 2 is a similar view, the plate being inclined. Fig. 3 is a cross-section, the parts being shown in substantially the relation of Fig. 2. Fig. 4 is a detail of the pivotal supporting part; Fig. 5, the same from a different point of view; Fig. 6, an elevation of this with other associated parts; Fig. 7, a detail of the lower supporting parts; Fig. 8, a detail of the arm connection; Figs. 9 and 10, details of the lower rail and eye for controlling the device.
    Like parts are indicated by the same letter in all the figures.
    A A are the surrounding portions of the window-frame. B is a prism-plate associated therewith, preferably as nearly as possible of substantially the same width as the window-opening. This prism-plate is associated with two arms C C, one on each side, each pivoted at the point D to the window-frame, and also pivoted at a point E to the side bar F of the prism-plate B.
    The side bars F F of the prism-plate are joined at G to the cross-bar H, which, together with the side bars and the lower end bar, form the frame of the prism-plate. The cross-bar H is turned over at J and pivoted at K by the antifriction-rollers in the channel-bars L. The distance from the pivot-point K to the pivot-point E is equal to the distance from E to D, and each of these distances is substantially equal to one-fourth of the entire length of the prism-plate.
    N is the lower frame-piece of the prism-plate.
    The pivot-points or rollers K K are adapted to roll up and down in the channel-bars L, so that the frame at that end is pivoted, but on a movable pivot. These channel-bars are held in position on the frame and in proper relation to each other by the screws M M, being shaped as indicated in Fig. 6, so that the bent portion J of the top bar H passes between the two portions of such channel-bars. Since the pivot-point B is fixed and the pivot-points K K are movable, it is evident that the prism-plate B may be inclined more or less, and since the distances from the pivot E to the pivots K and D are the same the center of gravity or the middle joint of the plate B will move back and forth in a horizontal line, or, in other words, the prism-plate is so supported that its center of gravity when it is swung to different inclinations travels on a horizontal line, and therefore there is the least possible friction on the parts, the plate will stay in any desired position, and the plate can be minutely adjusted. At the lower end of the plate and on the cross-bar M is secured the eyepiece N, whereby the plate can be drawn in or out. Since the upper end of the prism-plate