US762926A - Shade-reflector for artificial lights. - Google Patents

Description

PATENTED JUNE 21, 1904 0." A. MYGATT.

SHADE REFLECTOR FORARTIFIGIAL LIGHTS.-

APPLIOATION FILED NOV. 17. 1903.

H0 MODEL'.

FIG--1.

PI G. 2.

wmmm Patented June 21, 1904.

PATENT 'O FIGE.

(I OTIS Aynn'rai'r'r, OF New 'YQRIe-N. Y.

' SHADEV-RE-JFLECTORFQJR ARTIFICIAL LIGHTS.

srncrneamon forming part of Letters Patent No. 762,926, dated June 21, 1eo4. I Application lilod November 1 7, 1903. Serial 110.181.,494. (F model.)

To all w/wm, it may min/earn:

Be it known that I, Orrs A. MYGA'IT, a citi" zen of the United States, residing at New York, in the county of New York and State of NewvYork, have inventedcertain new and usefulv Improvements in-Shade-Reflectors for Artificial Lights, of which the following is a specification, reference being bad therein to'thc accompanying drawings.

This invention relates to reflecting and diffusing shades for artificial lights.

i The object of the invention is to' produce an integral shade and reflector of glass which shall reflect thelight rays which would otherwise go upward or in an undesirable direction 'and'afterward difl'use such rays," as well'as the direct rays.

' The invention consists in the constructio'n and combination of mechanical elements hereinafter stated.

Figure 1 is an elevation-of a shade-reflector involving the present invention, an incandescent electric-lainp bulb being situated in'the shade." Fig. 2; is an elevation of a shade-reflector involving the Same principles, but differing in form. Fig. 3 is a diagram showing 1 lines of reflection of a light-ray by a doubleas, for instance, in myPatent No. 687 ,848 of' reflecting prism.

It has been common to construct reflectors for artificial lights entirely of glass, the reflection being accomplished by means of prisms usually arran'gedon the outside of the glass- December 3, 1901.

In the present invention I construct the principal reflecting portion of the shade-reflector of glass, preferably transparent, the prisms being of the character described in my gatent No. 736,535: In Fig. 1 the portion A 1,0 terhally by prisms, which are double-reflect- O of the reflector is shown as covered ex v ing prisms. Y

The lower portion of the shade-reflectorB is covered externally or internally by an etched. ground, or other diflusing surface,

- the (admit of which is to d'ifiuse and soften the light-rays which pass through the same.

In constructing an entirely prismatic globe of the form shown in Fig, 1 the body would necessarily be pressed in a mold with an open-' softened and diffused ing large enough to withdraw the plunger.

This wouldinecessitate that a body he made as wide as the dotted lines I) H, which portion must be drawn in by hand,:involving a thick- 7 ening and distortion ofthe glass.

In the present invention the portion D -C H of the shade is pressed plain andas thin etched surface on either face or' otherwise fur-' nished with a diffusion-face.

In Fig. 2 the portion 1 K L M is pressed with external prisms. and 'the'portion L O M is made smooth and then ground or .etched.

In Figs. 1 or2 a ray of light emanating at 0 would pass to f, thence by double reflection from the prismatic portion of the shade-reflector would be directed to g, and theme in passing through the ground glass would be in a manner well understood. This ground-glass surface softens and diifuses the light-rays, but does notn'ecessa- ,rily or appreciably-refract or chan ethe dir'ection of the light-rays as results 0 the use of the prisms at the lower part of the shade described in my patentabove referred to.-

The form of the reflecting portion of the I d shade-reflector will to some extent control the direction toywhich the reflected rays are diverted. The form of the ground "or diffusion portion will have little influence in directing I do not limit my invention to special forms, except that the shade-reflee forhshall substantially inclose the source of ig t. i

the light-rays.

,I have referred'to the reflecting portion of the shade-reflector or that part provided with I external prisms as the uppe1""portion for convenience of description. Of course the ar ticle may be ad usted in any position.

I am not aware thatprior to myin'vention 'ashade or reflector has been constructed ofglass in-a single piece with a portion only of its body covered by reflecting-prisms, leaning V a plain portion to be completed by etching'or in other mannerto giveia diffusing-surface.

I cla1m 1. A shade-reflector consisting of a piece of nor than the prismatic portion. v

2. A shade-reflector composed of a single piece of glass having lts'upper portiomsubstantially covered externally with prisms exi o tending in thedirections of ribs orlunes from the-central upper portion, and having its lower turned in position free from prisms and with a ground surface.

3. A shade-reflector composed of a single;

piece of glass, having a portion of its outer surface externally covered with prisms rudiating from a common center and constructed to reflect light from within back into the ladereflector, and having another portion to which the light so reflected is generally directedconstructed with a ground surface, to difi' use the light in its outward passage. In testimony whereof I afiix my signature in presence of two witnesses.

' i OTIS A. MYGATT.

Witnesses:

' H. E. NAsoN,

W. A. DOREY.

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