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Publication numberUS1215894 A
Publication typeGrant
Publication dateFeb 13, 1917
Filing dateApr 19, 1916
Priority dateApr 19, 1916
Publication numberUS 1215894 A, US 1215894A, US-A-1215894, US1215894 A, US1215894A
InventorsShigezo Yuyama
Original AssigneeShigezo Yuyama
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Incandescent electric lamp.
US 1215894 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)


1,215,894 I Patented. Feb. 13, 1917s ATTORNEY SHIGEZO YUYAMA, OF BRGOKLYE, NEW YORK.



Specification of Letters ratent.

dumm- Patented Feb. 113, 1917.

Application filed April 19, 1916. Serial It's. 92,079.

To all w/wm it may concern:

Be it known that I, SHIGEZO YUYAMA, a

dent of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Incandescent Electric-Lamps, of which the following is a specification.

This invention relates to electric lamps and filaments and especially to incandescent light glowers so arranged that the greatest length or area of the same shall be located in a substantially horizontal position, the object of the invention being to aiford direct downward action for the light rays of the lamp, as will be more fully described in the following specification, set forth in the claims and illustrated in the accompanying drawings, and wherein:

Figure 1 is a side elevation of an incandescent electric lamp looking at the film frameirom onecorner.

Fig. 2 is an enlarged view of the. filament and its frame from the front.

Fig. 3 is a side view of the same.

Fig. 1 is a view from below.

In the construction and arrangement of incandescent glow lamps it has heretofore been the practice to suspend the filament vertically so that the light therefrom is radiated laterally throughout the length of the filament and its loops and coils. When the filament is strung on frames the same plan has been pursued and substantially the entire filament is arranged in vertical windings or loops and the tendency or". these con" structions is to cause lateral illumination...

The purpose of the incandescent film lamp in a large majority of cases, howev er, is to secure downward illumination and unless reflectors are used, the use of the vertical filament results in a great loss of efiiciency in the average lamp, and in many cases reflectors are used to divert horizontal rays from the vertical filaments to vertical rays for use.

This indirect illumination, as above described, results in considerable loss of the lighting efficiency of the lamp.

The improved construct on of the present;

invention, while designed to afiord a maximum lightin power at the bottom of the glower and in a horizontal position, at the same time provides an abundance of light means on other lines which may he arranged to so conform with the interior oi the reflector as to be also concentrated indirectly with the direct rays beneath the lamp.

Attempts have been made to arrange glowers horizontally but they have been supported at one end only and the fragile nature of the filament causes it to break and disintegrate after a brief period. When the filament is supported from both ends its life is prolonged because the leverage of a freeend is eliminated. in the present invention the supports at each end of the horizontal'parts of the filament are resilient and enables it to withstand shocks and blows while the usual rigid supports render the filament liable to destruction on account of its brittleness.

The bulb 10 forming a part of this lamp may be oi the substantially pear shaped variety but somewhat larger at its lower end and where its outline is an arc of somewhat long'er radius than the ordinary lamp and is perfectly convex and without irregularity or projection. At its upper end isthe plug 11 to secure the lamp in a socket and the leading-in 'wires are inclosed in the usual glass stem 12. The said stem is fiattened as at 13 a short distance below the exit point of the terminals and from thispart a reduced stem 1% projects downward. Through the flattened part 13 extends a cross bar 15 having loops 16 on each side of the stem and. the lower end of the stem 14. carries a crossbar 1?, at rightangles to the bar 15, and said bar 1Tv has lateral extensions 18 at each end parallel with the bar 15 and also having loops 19.

The ends of the terminals 20 turn down ward and. each projection has secured to it on end of. the filament as will be seen. The bar 15 is much shorter than the bars 18 as shown in Fig. 2 and the terminal extensions 21 are less in width than the said bars 18, and in Fig. 4 it will be seen that the distance apart and the expansion of the latter bars is practically equal and lines drawn from their corners will form asquare. @ver this square'ai'e strung the horizontal sections of the filameht, one end of the same running from. itsterminal through an end loop 19 of the that 18 and after taking a horizontal courseis carried. across the bar 15 forming one of the side se'ctionsfli and being-carried downwardon vthe other side to the opposite bar 18. This winding is repeated and the other end of the filament is secured to the remaining terminal, thus forming a triangugarded as a volume of light of that size and as this constitutes considerable space within the bulb, the light from such an arrangement would be considerable.

The most important result accomplished by this arrangement is the large light sur face secured from thelower side or the lamp and at a point from which the greatest amount'of light is desired. The lamp may also be provided with a reflector having sides at the proper angle to divert the rays from the inclined sides 24 to vertical lines beneath the lamp.

The arrangement of the carrying frame, comprising the bars 15 and 18, and the stringing of the filament around the same provides a very substantial construction and braces the filament against dangers of destruction.

The filament may be made of any desired material which is capable of being strung about the frame and by actual demonstration it is foundthat a. filament constructed and arranged as above described may be made of practically the same length of material as lamps which are in common use but require no more power to heat nor cost no more to operate than the same ordinarily used lamps,

' and obviously this improved lamp gives better results on account of the disposal and arrangement of the source of light.

It is obvious that the modified or otherwise arrangement of the parts may be resorted to without departing from the essentlal features above described or from the scope of the appended claims.

What I claim as new is:

1. In an electric lamp, the combination with a transparent bulb, of a frame carried by a vertical stem and comprising two lower and upper cross arms, and a filament strung around the frame in a wedge shape and the lower members passing from one cross arm to the other and arranged parallel and horizontal.

2. In an electric lamp, the combination with a bulb, of an insulated frame comprising lower and upper cross arms, leading-in wires connected with the upper arm, and a filament of a single piece with its ends connected with the upper cross arm and strung above and parallel with the extensions, and

a glower filament strung from the extensions and. over the cross bar.

st. In an electric lamp, the combination with a bulb having a lower enlargedconvex end, of a stem carrying the leading-in wires, a ba at the lower end of the stem and having lateral extensions at each end. a cross bar through the stem above the first bar and parallel with the extensions, amid a glower filament attached at its ends to the leading-in wires and wound about the extensions and the cross bar to form a wedge shaped outline with its greatest surface at the bottom.

5. In an electric lamp, the combination with a bulb, of an insulating stem carrying the leading-in wires, a cross bar in the stem and having loops, a second bar at they end of the stem, lateral extensions on the latter parallel with and longer than the cross bar, and a glower filament strung around the cross bar and the extensions to form a wedge shaped frame whose base is the largest light giving side.

Signed at New York, in the countyof New York and State of New York, this 97th day of March A. D. 1916.


Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.

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U.S. Classification313/277, 313/315
Cooperative ClassificationH01K1/18