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Publication numberUS721257 A
Publication typeGrant
Publication dateFeb 24, 1903
Filing dateApr 15, 1898
Priority dateApr 15, 1898
Publication numberUS 721257 A, US 721257A, US-A-721257, US721257 A, US721257A
InventorsFrank L O Wadsworth
Original AssigneePressed Prism Plate Glass Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Reflecting structure.
US 721257 A
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Description  (OCR text may contain errors)


APrLloATloN FILED APR. 15, 189s.

| IIV 1:5] Il.: l- .il I 11V N0 MODEL,



REFLECTING SPECIFICATION forming part of Letters Patent No. 721,257', dated February 24, 1903.

Application filed April 15, 1898.

T @ZZ whom, it' may concer-7c;

Beit known that I, FRANK L. O. WADs- WORTH, a citizen of the United States, residing at I/Villiams Bay, in the county of Walworth and State of Wisconsin, have invented certain new and useful Improvements in Reflecting Structures, of which the followingis a specification.

My invention relates to illuminating strucf Io tures; and it consists of a reiiecting-illuminator particularly applicable to receive light from the sky and direct it downward into a vertical opening in a building, such as a lightwell. In general light is received through such an opening only from that portion of the sky1 immediately overhead, and if this is overcast with clouds the illumination at the bottom of the light-well will be very defective, although other portions of the sky may be zo very brightly illuminated and capable of furnishing sufficient light for efcient illumination. To avoid this difficulty and obtain a construction which will always send the light from the brightest part of the sky down the light-Well, I place over the latter a reliector of the character fully set forth hereinafter and as illustrated in the accompanying drawings, in which- Figure 1 is a sectional elevation showing 3o theupper part of a light-well with my improved refiecting structure; Fig. 2, a section of a reliector having flat faces.

In the construction shown in Fig. I, H H represent adjacent buildings or the walls on opposite sides of a light-well X, above which my improved illuminating device is placed. The said device is a rounded tapering structure K, exteriorly conveXly curved in longitudinal cross-section, with an external re- 4o fleeting-face so formed that successive portions of it receive light from different directions and send it vertically downward into the Well. To accomplish this, the surface of the structure is so formed that the lower portion makes an angle of about forty-ive degrees with the axis of the structure, while the upper part is nearly parallel to it. The in- Serial No. 677|'740 l (No model.)

termediateportions are either continuously curved, as shown inFig. 1, or made up of a series of narrow flat faces arranged so as to o make continuously decreasing angleswith the axis of the structure as we go from the lower end toward the upper, as in Fig. 2, which simply represents in sectional outline one side of the structure. As this reflectorface is in general acylinder of revolution, (or its equvalent,) of which the section only is shown, it is evident that someA portion of it will always be in such a position as to receive light from the brightest portion of the sky, 6o in fact from the sun itself, and reflect it downward into the well. Therefore, whatever be the position of the sun there is always a direct sunlight illumination at the bottom of the well, such as would be obtained if the sun were directly overhead. In the construction shown the reflector tapelrs to a point, so that the only portion of the light from directly overhead which gets into the well is that which passes the edges of the cone, as 7o at 1 l, and to permit the passage of any such vertical light we must make the cone slightly smaller in diameter than the opening over which it is placed.

The reflecting structure may be a shell or case of polished metal or of metal or otherI material,suitably coated to secure a reflectingsurface, and it may be supported in any suitable manner which will enable it to be adjusted to the required position over the mouth 8o of the light-wellor opening above which it is placed.

The reiiectiug structure may be exposed, as shown in full lines, or in some Ycases with a transparent protecting-covering, arranged as indicated by dotted lines Z, Fig. 1.

Withoutlimiting myself to the precise construction, proportion, or arrangement shown,

I claim-L A daylight-refiecting structure arranged 9o above a light-well and consisting of a shell tapering to a point upon curved lines from the base to said point, the curvature of the surface being such that the angle between the tangent to the curve of any axial section, and I name t0 this specification in the presence of the axis of the shell itself'varies from zer' 1 two subscribing Witnesses. n degres at tie base f the shell to forty-five degi'es at the point of the shell, the outer 5 surf'ce being a reflecting-surface, substantiallyV as desribed.

In testimolny whereof I have signed my 'FRANK L. O. WADSQWORTYH.



Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4820020 *Nov 19, 1987Apr 11, 1989Terrill Frank EFor solar lighting
Cooperative ClassificationF21S11/00