US1182654A - Light-shield. - Google Patents

Description

E. F. DE WITT. LIGHT SHIELD.

APPLICATION HLED JUNE 22,1915- 1 1 82,654. Patented May 9, 1916.

V WITNESSES INVENTOI? 2M 6/34", ff'aeh zz'zi Wm #W A ITORII/EYS UNITED srrrras RgrENT OFFICE.

EMIL F. DE WITT, OF TROY, NEW YORK.

LIGHT-SHIELD.

Application filed June 22, 1915.

tion.

My invention relates to light shields of a kind suitable for general use and also for light shields especially adapted for use upon street cars and in various other kinds of railway vehicles.

My invention may be used to advantage in carriages, boats, automobiles, and the More particularly stated, my invention coinprehen'ds a lamp provided with a me tallie shield so prepared and arranged as to serve as a reflector for the light, and also for directing diffused light along a. somewhat restricted path.

Reference is made to the accompanying drawings forming a part of this SPQClfiC&

A lamp casing is shown at 4, and in this;- .1nstance has a parabolic form, such as is commonly used for search lights. Mounted wit'hin this casing is a lensli, which is en;

gaged by a cupped edge 7 forming part of an annular head 8. A ring 9, made of flat sheet'metal, is provided with a pair of lugs- ;10 integral with it and extending parallel with each other. A bolt ll extends through these lugs and is engaged by a l nt, l2. A plate 13, of substantially semi-circular form, constitutes the ,body portion ,of the light 4 shield. The inner face 14: of this plate is Highly olished, and is adapted .to serve as a re ector. The plate 13 is provided with strips l6. l8, integral with it. the strip 16 being bent backward upon itself, or pro vided with a reverting portion 17, and the strip 18 being siinilarlv bent back or provided with a reverting portion 1 Another Specification of Letters Patent.

Patented May 9,191 a.

Serial No. 35,667.

strip 22, also integral With the plate 13 extends from it, and is bent back upon itself and thus provided with a reverting portion 23. A thumbscrew 20 extends through the strip 18 and the reverting portion 19, and also "through the wall of the ring 9, these parts being provided with holes for this purpose.

The light shield, consisting of the plate 13 is mounted upon the ring 9 by aid of the thumbscrew 20. In order to fit the ring 9 upon the lamp casing 4, the bolt 11 is're moved, the rlng placed in position,'and the bolt 11 replaced and secured by the nut 12.

The light from the lamp carried within the lamp casing 4, upon striking the inner fa ce 14 of the light shield, is're'flected, and is also dilfused. The inner surface of the light shield is polished to act as a reflector. The light, being reflected back and forth in a nun'iher' of directions, consequent upon the curvature of the inner surface of the lamp casing 4, is very much diflused and broken up. As it leaves the lamp it passes out through the upper half .of the lens 6, will be understood from Fig. 3. Hence, if the lamp be. located in a car or the like, the lighbtends to illuminate the upper in nor portion of the car. -Preferably this portion of the car is painted white, and, owing to the shape usually given this part of the car, it serves to scatter and diffuse the light. The result is that the inner portion of the car is illuminated by alight .vhich is agreeable to the eye. 1

. Owing to the fact that no light is waster.

by leaving the lamp through the bottom portion of the lens 6, the light thrown out is comparatively strong; that is to say, it is approximately twice as intense as the light which would ordinarily be emitted through the upper half of the lens. The light being diffused, and being directed upwardly, exercises a maximum degreeof illumination.

I do not limit myself to the precise construrtion shown, as variations may be made therefrom without departing from the spirit oi my invention. Neither do I limit myself to any particular type of lamp or lamp-casing to he used in connection with my light shield.

Having thus described my invention, what I (-lainrasneu' and desire to secure by Letters Patent is as follows: i

l. A device of the character described, comprising a lamp casing provided with an annular bead; a ring encircling said lamp casing and engaging said bead; a light shield having a reflecting surface and located to intercept a portion of the light rays tending to leave said lamp casing; said light shield being separate from the ring and provided with means for detachably securing it to the said ring.

A light shield comprising a metallic plate having the approximate form of a semi-circle and polished upon one side, said plate being prmided with integral strips projecting from it, each of said strips having its end bent to form a hook; a ring sep arate from said plate and detachablv engaged by the hooks thereof; and means for securing one of said hooks firmly to said ring.

3. A device of the character described, con'lprising a light shield having approximately a semi-circular form and provided with strips having their ends bent to form hooks, one face of said light shield being prepared to enable it to reflect and diffuse light; and a clamping ring with which the hooks of the shield engage.

4. A device of the character described,

comprising a ring for encircling a lamp casing; a. light shield having approximately the form of a seini-circie and made of sheet metal, one face of said plate being prepared to enable it to reflect light, said plate being provided with metallic strips integral with it, each strip heing'bent back upon itself and engaging said ring; and means for clamping one of said strips rigidly to said ring.

As an article of manufacture. a light shield comprising a plate of sheet metal having approximately a semi-circular form and having one of its faces polished in or der to reflect light, said plate being further provided with strips of sheet metal integral with it, each of said strips being provided with a reverting portion and a screw extending through one of strips.

In. testimony whereof l have signed my name to this specification in the presence of two subscribing Witnesses.

EMIL F. on W lTTi W'itnesses GEORGE L. LonnnnL, VVJLIJAM B. MCOMBER.

Images