US1626498A - Reflector - Google Patents

Description

V 1,626,498 April 1927" P. s. BAILEY REFLECTOR Filed Sept. 23, 1924 Inventor":

Percg S. Bailey,

His Attotneg.

particular -to a type which is Patented Apr. 26, 1927.

PERCY s. BAILEY,

. nnrrncroa;

Application filed September 23,1924. $eria1No.'739,429.

My invention relatesto reflectors andjin especially adaptedfor street lighting.

Reflectors for street lighting are very often made round so that they spread out wheel-like. -These reflectors 'are'sometimes provided with radial wave-like convolutions for the purpose of diffusing the light.

Reflectors of this type give a'general uniform distribution of light about the axis of the reflector. Sometimes, however, it is desirable to construct the reflector so as to intensify the light in one ormore zones or areas. I have found that this can be Very effectively done by forming sections on opposite sides of the reflector into paraboloidal or ellipsoidal surfaces the axes of which may be at right angles to or sloping,

with respect to the axis of the reflector. If asymmetric light distribution is desired the paraboloidal or ellipsoidal surfaces may be confined to one side of the reflectors or these surfaces may be asymmetrically distributed with respect to the axis of the reflector. v

The character of the invention, however, will be more clearly understood by referring to the accompanying drawing in which Fig. 1 shows one form of the reflector in elevation and partly in section; Fig. 2 is a plan View of the reflector of Fig. 1; Fig. 3 is a side View of the reflector of Fig. 2; Fig. 4 is a diagrammatic illustration of the light distribution with a form of reflector in which the axes of the major corrugations,

such as shown in Fig. 1, slope with respect to each other. In this figure the curve represents the distribution of the initial candle power in a maximum vertical plane.

Referring more in detail to the drawings, it will be seen that the reflector has a central hood or dome section 2 with a collar 3 about which collar the reflector may be held by means of any suitable support. From the lower point of the hood the reflector flares out to form the webs 4 and 5. As shown in the drawings these webs are provided with radial waves. These waves may be conical focalizing surfaces. However, these may also be plain flat surfaces. In between the sections 4 and 5 the reflector is formed into paraboloidal surfaces 6 and 7 having a common focal point F at which the light. source L is located. These paraboloidal sections may be located in anysuitable position.

" ice.- A

OF'MARIBLEHEAD, MASSACHUSETTS, ASSIGNOR TO GENERAL ELEoi For example, the axes may lie 1n a common line across the central axis A',A of the reflector. 1011 the other I hand, theaxes of these paraboloidal sections may slope with respect to "the central axls asindicated in Fig.1. :Therefore the axes may lie'in a plane through the central axis A or one may lie in one plane through the central axis A and another may lie in a different plane. through the axis'A. In Fig.1 the axes ofthe tWo-paraboloidal sections are represented as'being in a common vertical plane but sloping with respect to the axis A It is also possible to have the axis'of one paraboloidal section inclinedto the A axis at a different angle from the axis ofthe otherparaboloidal section. It

will be seen therefore that each of the paraboloidal surface-s intercepts a 'comparativeare contemplated which fall within the' scope of the claims herein;

What I claim as new and by Letters Patent of the United States,1s

desire to secure 1. A reflector having a pair of surfaces of revolution, each surface produced by ro-' tating a conic about an axis crossing the central axis of the reflector, said surfaces connected on one side by a reflector having a series of corrugations each in the form of a ,3.

focalizing surface generated about an axis,

the axes of such corrugations making each the same angle with the axis of the reflector,

said surfaces being also connected on the opposite slde by a reflector having a series of corrugations similar to those on the opposite side, the axes of said last corrugations also making each the same angle with the axis of the reflector.

2. A reflector having a pair of surfaces of revolution, each surface produced by rotat ing a conic about an axis crossing the'central axis of the reflector, said surfaces connected by corrugated reflectors, one located between the surfaces of revolution,and on one side oftheir axis and'the other on the and other side of the surfaces of revolution, the projection of the reflector upon a plane at right anglesto the axis of'the reflector covering a circular area, each connecting surface having a multiplicity of corrugations in the form of a focalizing surface about an axis, all of'said axes lying in a cone Surface the axis of the cone and the axis of the reflector being co-incident.

3. A reflector formed with a series ofcor rugations, said corrugations each being in thew-form of a focali'zmg surface generated.

about an axis, all of said axesv radiating froma common point in the axis of the reflector, only two 'ofsaid surfaces, being'of major proportions and the remainder of-said surfaces being ofminor proportions, the:

axes of all of the corrugations being located in a cone surface, the axis of which is coincident With-the. axis of the. reflector.

4. ,A reflector formed wlth a serles of corrugationasaid corrugations each being in o the form of a focalizing surface generated about an "axis, flllf Of'SalCl axes" radiating from a common point'in the axis of the reflector, only two of said surfaces being of major proportions and the remainder of said axes of the major corrugations slopingwith respect to each other;

, In'witness. whereof, Ihav'e hereunto set my hand this 20th day'of September -1924;

PERCY S. BAILEY.

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