US1832689A - Incandescent lamp or similar article - Google Patents

Description

Nov. 17, 1931. P. A. CAMPBELL INCANDESCENT LAMP OR SIMILAR ARTICLE Filed March 17, 1927 fiv'mzv TUE; PER 5y .13. Liz MPEELZJQ 22'' P? /A .H'rs' ATTURNEZZI'Z Patented Nov. 17, 1931 UNITED STATES PATENT OFFICE PERCY A. CAMPBELL, OF EAST CLEVELAND, OHIO, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK INCANIDESCENT LAMB SIMILAR ARTICLE Application filed March 17, 1927. Serial "No. 176,225.

My invention relates to electric incandescent lamps and similar devices which comprise a filament supported within a bulb or other container. More particularly, my invention relates to devices of that character which are subjected during use to forces causing considerable vibration of the filament and its supports. The object of my invention is to render the filaments of such devices less responsive to forces tending to their maximum amplitude of vibration at their free ends and a comparatively small amplitude at the points of engagement with said filament.

In the modification shown in Figs. 3 and +1, a somewhat similar effect is secured by weighting the leading-in supports adjacent to the points of engagement with the filament. Pieces of metal such as nickel are united as by welding to the leading-in sup- H) cau vibration thereof, ports which are usually of nickel. The ef- According to my invention means are profe-"t is to deaden the vibration which would vided for reducing the amplitude of vibraordinarily occur at these points. As shown, tion at the points of engagement of the leadthese points are near the end of the leading ing'in and other supports with the filament. 1n supports.

" This may be accomplished, for example, by lVhat I claim as new and desire to secure making said points of engagement intermeby Letters Patent of the United States, is: diate rather than end points of the said sup- A filament assembly for an incandescent ports, by weighting said points in some way lamp including a filament substantially in or by a combination of such methods. The a plane at right angles to the axis of the 7 efi'ect is to make nodes of said points or at least to make their amplitude of vibration much less than if they were at the ends of the supports or if the supports were unweighted. I

In the drawings, Fig. 1 is an elevation of an electric incandescent lamp embodying one form of my invention; Fig. 2 is an elevation at right angles to that of Fig. 1; Fig. 3 0 is a fragmentary elevation; and Fig. 4 is an elevation at right angles thereto of a modification.

The incandescent lamp shown in Figs. 1 and 2 comprises the glass bulb 10 within which is supported a filament mount comprising a glass stem 11, a central glass rod 12, and the leading-in conductors 13 which are sealed at 14 in the stem 11 and are electrically connected to leading-in supports 15 7 each having one end embedded in the stem the leading-in and other supports will have lamp, astem and a plurality of combined leading-in conductors and filament engaging supports extending from said stem, the free ends of said supports each projecting beyond the point of engagement with said filament to damp the vibrations oi the filament. In witness whereof, I hare hereunto set my hand this 15th day of lllarch. 1927,

PERCY A. (ll lliBELL.

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