US1523245A - Electric-light globe - Google Patents

Description

M., A. BAMBOROUGH ET AL ELECTRI C LIGHT GLOBE Filed June 18, 1925 rut-072s Elli (6' M 0 Patented Jan. 13, 1925.,

cars

MASON A. BAMBOROUGH AND HAROLD A. BAMBOROUGH, OF CHICAGO, ILLINOIS.

ELECTRIC-LIGHT GLOBE.

Application filed June 18, 1923.

To all whom it may concern:

Be it known that we, MASON A. BAM- BOROUGH and HAROLD A. BAMBOROUGI-I, both citizens of the United States, and residents of Chicago, Cook County, Illinois, have invented eertain new and useful Improvements in Electric-Light Globes, of which the following is declared to be a full, clear, and exact description.

This invention relates to electric light globes, and its principal object is to provide a globe of improved construction and having a novel shape whereby it may be formed of very thin material throughout, and i whereby a maximunr efiicieney may be ob tained from the lamp contained in the globe.

Another object is to eliminate bright spots and dark spots in the globe and to provide one in which the light, issuing from the :l lamp, is diffused in all directions whereby a soft mellow and bright light may be obtained. lVith these and other objects and advantages in view, this invention consists in an electric light globe, the side wall of which takes the form, in vertical, cross section, of double reverse curves, whereby annular, outwardly bulged portions are formed adj acent the upper and lower portions of the globe, the upper bulged portion being approximately directly over the lower bulged portion, and an inwardly bulged portion intermediate said outwardly bulged portions. The invention further consists in the several novel features hereinafter fully set forth and claimed.

The invention is clearly illustrated in the drawing accompanying this specification, in which:

Fig. 1 is a perspective view, looking from below, of an electric light globe embodying a simple form of the present invention; Fig. 2 is a central, vertical section through the globe and showing in side elevation, a shade holder, an electric light socket, and an elec- -15 tric lamp, and Fig. 3 is a detail, horizontal section taken on the line 3-3 of Fig. 2.

Referring to said drawing, which illustrates a simple embodiment of the present invention, the globe A, is shown as secured to and supported by a holder B, of common and well known construction, having the usual set screws 6, for engagement with the neck a, of the globe. In the form shown, the holder B, is clamped upon an electric light socket C, by a suitable clamp, as is Serial No. 645,975.

well understood, and an electric lamp D, of the incandescent type is secured in the socket C and projects down into the interior of the globe. In order to obtain a brilliant light, it is preferred to use an incandescent electric light lamp of the nitrogen type, although, of course, this is not essential to the invention, broadly considered.

The shape of the walls of the globe is best seen in Fig. 2 where it will be seen that the side wall (L in vertical section takes the shape of a double reverse curve which merges into the bottom wall a? of the globe. The double reverse curve forms upper and lower outwardly bulged annular portions at, 5, and an inwardly bulged portion 6 intermediate the outwardly bulged portions at, 5. The upper and lower bulged portions are approximately in vertical alignment. The outwardly bulged portion l curves upwards and inwards towards the center of the globe, as at 7, forming the top which merges into the flaring neck a. The lower outwardly bulged portion 5 merges into a curved portion 8 which curves downward and inward towards the center of the globe and then curves downward, as at 9, finally merging into a reverse curve 10 which continues on towards the other side of the globe, and the curved lines just described continue throughout the entire top Wall, side wall and bottom wall of the globe. It will be noted that the outwardly bulged portion 5 of the globe is of slightly less diameter than the outwardly bulged portion -l. which we find gives added etticiency to the globe provided the diameters of the two out wardly bulged portions are substantially the same.

The point at which the source of light is normally located, is approximately midway between the top and bottom walls of the globe, and the crowns, or extreme outer places of the outwardly bulged portions, are approximately equidistant from said norn'ial source of light point.

The globe is fori'ned by blowing the glass in a mould, and because of its peculiar shape, as above described, we are able to obtain a very thin wall, which makes the globe light, and yet, because of its shape, it is less liable to be broken or cracked from heat or jars. It is to be observed that there are no sharp or abrupt places in the walls, but that the entire wall is composed of reverse Ill) curves. This feature is essential to secure the best results obtainable. The globe is made of translucent material as is customary.

One of the advantages of an electric light globe constructed in accordance with the above description, is that its shape permits the wall of the globe to be blown thinner than other shapes. Another advantage is that no hot spots are created in the wall, nor are there any bright spots or dark spots, but the entire wall of the globe dilfuses the light evenly. Another advantage is that a lamp of high wattage may be used in the globe.

and becauseof its shape, the intensely bright light is concealed and thoroughly diffused in all directions, thereby greatly increasing the efficiency of. the electric light globe. Another advantage is that there is an even flow of light rays because of the peculiar shape given to the walls of the globe. An-

7 other advantage is'that there are no sharp shadows cast from a light contained in a globe as above described, but the shadows are sottand unobjeotionable. Another advau tage,vas shown by actual test, is that over 91 per cent efliciency is obtained from the source of light, which makes it possible/to ruse electric lamps of less wattage than is to point out all of the invention disclosed herein. 7

e claim as new and Letters Patent:

1. An electric light globe formed of translucent material, the walls of whicharerelatively thin and of substantially even thickness throughout, and con'iprising top and bottom walls and a side wall, the top wall sloping outward and'downward and the side desire to secure by wall having an annular outwardly bulged upper portion and an annular outwardly bulged lower portion, and there being an annular inwardly bowed portion in said side wall between and merging, along lines that form an obtuse angle, into said outwardly bulged portions, the diameter of said inwardly. bowed' portion being slightly less than that of the outwardly bulged lower portion. r

2. An electric light globe formed of translucent material, the Walls of which are relatively thin and otsubstantially even thicltness throughout, and comprising top and bottom walls'and a side wall, the top wall sloping outward and downward and the side wall having an annular outwardly bulged upper portion merging into said top wall and anannular outwardly bulged lower por-' tion merging into said bottom wall, and

there being an annular inwardly bowed portion in said side wall between and merging along lines that 'form an obtuse angle, into said outwardly bulged portions, the diameter of said inwardlv bowed portion being slightly less than that of the outwardly bulged lower portion. r

MASON A. BAMBOROUGH. HAROLD A. BAMBOROUGH.

Images