US1504017A - Reflector - Google Patents

Description

P. S. BAILEY Aug. 5 1924.

REFLECTOR Filed Feb. 2, 1921 3 Sheets-Sheet 1:

Invemtor 1 peficg 5 Emmy,

fi m 4 y H 4 i5,

Aug. 5, 924. 1,504,017

' P. s. BAILEY REFLECTOR Filed Feb. 2, 1921 3 Sheets-Sheet 2 LM'LLUL LLLLLLLLLLMLM- Inventor: r arcg SBaHey,

Hm- Attorney.

PatentedgAug. 5, 1924.

PERCYS. rarnnyfor ama, mss'ncnosar'rs, Asst anon mo amines;

- QC OMP A KY, A. CORPORA'IION F YORK.

, niarnnc'roa. U

Application filed February 2,1921. s m no. 441,941.

To all iclwmitmayconcem:

Be it known that I,Pmzcr SL1BAinar,.

a. citizen of the United States, residingat Lynn, in the county of Essex, State of Y5 Massachusetts, havefinvented certain new and useful Improvements inReflectors, "of which the following is a. specification.

My invention has'referen'ce to improvements inrefiectors designed to give a widely spreadingnarrow beam,or a so-called sheet light, that is, a beam which is narrow in one plane and wide inthe planeat right angles to'the same.

' uch reflectors ma be employed for il- 1 laminating signs, an the like, where it is desired to keepthe adjacent z'onein dark-V ness. Orthe may be used to illuminate .tions infcontact. By reason of the'fact that the ground without projectin laring rays upwardly, suchas in landing e ds foravia-I sections, while in contactat their middley'm tors, or in automobile headlight s.

I. accomplish this result by providing a novel reflector having a; number of adjacent gambolic surfaces extending I irection to project a narrow bunch of parallel rgysin one direction, andthese surfaces are laterally soarranged as to produce a widely spreading beam 'in the gen eral direction at right angles to the parallel ravs. a Y lily-invention will be better understood from the following description taken in e0nnection with the accompanying drawings, and its scope will be pointed out inthe appended claims V In the drawings, Fig. 1 is a perspective vie'wof my reflector; Fi s. 2, 3 and 4 illustrate several steps in t e manufacturebf my reflector; Fig. 5 is a section taken-on the line (1-0 of Fig. 1 with reflected rays of light illustrated; and Fig. 6 is a view similar to Fig. 5 taken "on the line bb ofFi.1..' Re arring to the drawings, a surface ,of revolution such as a paraboloid 10 is cut into a number of zones or sections '11 on-j lines parallel to the axis asindicated in Fig. 2. These sections are-shown asof equal width, although their widths may vary. Preferably an .odd number of 'S00-' tions are cut and the even numbered or inone general terstitial sections removed, as shown in Fig. i

3; however the odd n m ered sections could be remove if desired. The'rem ain1ng sections 11 are arranged parallel on a curved -form whose curvature is selected-with theview of obtaining from the reflector the de sired lateral spread of light; the curvature may be circular, elliptical or parabolic The.

curved form may be a simple circular hoop;

of suitable diameter. Ifdo not limit myself 'od to any particular number of sections since v this number is determined'by thewidth of r': the sections and by the articular-cross. tional curvature adop a .The parabolic. sections are assembled sideby side-on the hoopor' other form like the staves of. a barrel, with their middle poionly the alternate sectio'nsare used, these or equatorial points 'willoverlap. at all other points oftheir meridional len h, the; amount/oi overlapping increasing the middle points to the ends. Inaddition thereto, each section following the central f5 section on each side will appear as stepped' 'down fromthe preceding section.. In order to rectify the overlaps, which could'not betolerated, the sides of the sections, and preferably the sides not facing the central sec tion, are trimmed of, as indicated at 12. in 1 Fig. 4, so that each section will fit the next ad acent section without overlap. In this; condition the sections will, of course, still he stepped from eachother, and the gaps 86 are filled out by well fitting ledges 13, in

'dicated in section in Fig. 6, and by dotted lines in Fig. 1.

- In practice molds or patterns of the parabolic sections are primarily madeof 90 stitfunyielding material, preferably of wood, and when trimmed for correction of overlap the sections are glued together and the well fittin ledges are also lued in their places. tained from which-any number of reflectors may be obtained bycasting or electro-deposition. In the completed reflector the ledges 13 are of the same reflecting mate- 'rial asthaparajwolic sections and the efie'ct 100 this manner a mo d is obof these ledges is enerally the same as that shown in Fig. las vertical.v In accordance of the surfaces the sections. Afterthe sections 11 have been united in the manner described the' reflector is provided with a. flange 14;, for convenience in mounting.

A source of light indicatedby the nu meral 15 is paraboloid the contour of the paraboloid is indicated by. the broken line 16, in Figs.

5 andn6. As I have hereinbeforepointed out, the alternate parabolic sections 11 are arranged parallel, in which positions they occupy lanes parallel to the planes of their origin positions, and form parabolic surfaces .in .one general direction, which is with well known laws governin reflection from parabolic surfaces, rays 0 light 'PI'O. ceeding from the focus 15 are reflected from these surfaces parallel to the axis of the paraboloid in this general direction. It has i not been deemed necessary to indicate these arallel rays. Inthe general direction which is at right angles to the general direction just described, the reflecting surface is form'ed'of the parabolicsurfaces of the sections 11' arranged as a polygon inscribed in a or circumscribed over a predetermined curve 5 and 6.

', cations thereof will 'ing beam is obtained other than a parabola; Cross-sectional views of this surface areshown in Figs.

In accordance with well known laws, all rays incident upon the polygonal surfaces are more or less equatorially reflected convcrgently toward the axis and diver s after crossing the axis. This is illustrated by the I incident rays 17'and reflected rays'18. It

will therefore be seenthat in one general direction a narrow beam of parallelrays is obtained and in. the neral direction at right angles thereto a wide, latera y, spreadvWhile I have described nay-invention as embodied in concrete form'in accordance with the provisions of the Patent Statutes, it should be understood that I do not limit my invention thereto, since various modifi those skilled in the art without departing from the spirit of my invention, the scope of which is set forth in the annexed claims.

What I claim as new and desire to secure by Letters Patent of-th'e United States, 1s:-

1. A reflector having a refiectingsurface comprising a series of alternate sectlon's cut from one paraboloidon lines parallel to the major axis of the paraboloid and arranged side by side polygonally about a predetermined curvature. I 2. A reflector having a rc'flectihg sur- .face comprising a series of. alternate sections cut from one paraboloid on lines parallel to I the major axis ofthe paraboloid, said secplaced in the focus of the.

suggest themselves to between the 1 sectheir focal points displaced and non-coinoident. 4. A reflector formed of a series of superimposed noncontiguoussections cut from majoraxes of said sections located in a comone particular surface of revolution, the

mon plane, said sections in contact along a v curve formed-by the' intersection of said plane and said sections the cut edges all lyingin parallel planes.

5. A reflector constructed with zones from a particular surface of revolution which 15 cut, by a series of planes-all parallel to a plane through the majoraxis of said surface,

into 'said zones and alternate interstitial areas and which zonesremain after the in terstitial areas areremoved,-said remaini zones drawn together to reduce the interstifialpgaps V V a cut, by a seriesofplanes all. parallel tea lane through the major. axis of said; surace, intosaid zonesand alternate intersth tial areas andwhieh zones remain 'afterthe 6. A reflector z'one slfroni a particular surface of revolutionjwh1ch 1s interstitial "areas are removed, said nemain- P lel relation of the planes through .tho cu edges of said remaining zones. y

7. A reflector constructed with zones from.

a particular surface of revolution which is cut, by a seriesof-planes all parallel toa plane through the-major ans of said antzones; drawn together'tb reducez'thc 1 I terstitial gaps while maintaininglthe" mt 1 0" face, into said zones and alternate iiitersti:

tial areas and'which'zones remain-after, the interstitial areas are removed, said ing zones drawn together toreduoe the interstitial gaps while maintaining "the" parallel relation of the planes "through the'cut. edges of said remaining zones and surfaces. com.

necting 'the-adjacent'cut edges of adjacent zones.

8. A reflector constructed with'zones from a particular surface of revolution whichis cut, by a series of planes all parallel to a;

lane-through the major axis of said surface Into said zones and alternate interstitia areas, and which zones remain after the interstitial areas are removed, said zones in contact along the, curve formed by the inter-- section with the said zones of I. plane through the said major axis which lane-lies per-pen dicular to said last mentioned 9. A reflector constructed tones from a particular surface of which is cut ,byaseriesofplanesallpuralleltoa' lane through the major axis of said' sursaid zones of a plane through the said major ace, into said zones and alternate interstiaxis which plane lies perpendicular to said tial areas and which zones remain after the last mentioned plane. interstitial areas-are removed, said reniain- In witness whereof, l have hereunto set 5 ing zones drawn together to reduce the intermy hand this 29th day of January, 1921.

stitial gaps, said zones in contact along a curve formed by the intersection with the a PERCY S. BAILEY.

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