US1411716A - Electric-light bulb - Google Patents

Description

A. A. FLORY.

ELECTRIC LIGHT BULB.

APPLICATION FILED MAY 10. I9I8.

Patented Apr. 4, 19.22.

9 11494 for ANDREW A... FLQRY, GE GRAND BIDS, MICHIGAN.

anaemic-arena sane.

Specification of Letters Patent.

Patented Apr. 4. 1922.

Application filed may 10, 1918. Serial No. 233,652.

To all whom at may concern:

Be it known that 1, ANDREW A. FLORY, a

' citizen of the United States of America,

residing at Grand Rapids, in the county of Kent and State of Michigan, have invented certain new and useful Improvements in Electric-Light Bulbs; and it do hereby declare the following to be a. full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an electric light bulb, being especially directed to a new and improved construction of light bulb for use in headlights of motor vehicles. In vehicles of this character, it is now almost universally the practice to provide some means vention to provide an electric light bulb which may be operated so as to eliminate the major portion of the rays of light which are normally directed upwardly above the road and which are liable to blind the driver of an approaching vehicle, yet at the same time keep substantially all of the rays of light which fall on the road in front of the ve hicle, said bulb when the vehicle is running on a clear road being operable to give a full and complete light without elimination of any of the rays. To this end I- have produced the construction shown in the accompanying'drawing, in which,

Fig. l is a vertical section through a headlight equipped with my new construction of light bulb.

Figs. 2 and 3 are side elevations of light bulbs embodying my invention, the same difiering slightly in detail of position of light formed of glass, projects inwardly into the bulb from the neck and terminates in a. shield 4 which, in the construction shown, is of trough-like form, concaved on its upper side and integral with the post 3. This shield 1s of opaque or translucent glass in the construction shown, though it is to be understood that any other suitable material may be used to make the shield so long as it is practically impervious to the passage of light rays.

An upper filament 5 lies directly above the shield 4 and between the upturned sides thereof, the wires forthe filament passing backw'ardly through the st 3 and one grounding on the sleeve 2, while the other leads to a suitable contact 6 at the rear end of the neck of the bulb. A second light filament 7 is disposed below the shield, the wires thereof leading back through the post 3, one of the same grounding on the sleeve 2 and the other leading to a suitable wntact 8 similarly positioned at the rear end of the neck of the bulb. It is to be understood that when the neck of the bulb is inserted in a suitable socket, such as used in the headlights of motor vehicles, contacts 6 and Sam brought into electrical connection with circuit wires 9 and 10 which supply the current to the filaments. The headlight with which t-he'bulb is used may be of any preferred construction including a curved reflector 11 on the inside thereof.

Vith a bulb of the character described used with a reflecting headlight, either or both filaments 4 and 5 may be made incandescent by closing proper switches in the separate circuits supplying said filaments. For full driving light both filaments are made incandescent and the rays of light therefrom are projected ahead from the reflector 11 in the usual manner. On meeting a vehicle, however, the circuit in which the filament 7 is interposed is interrupted by operating the properswitch, and light, rays are then given oil by the upper filament 5 only. These rays go to the upper part of the reflector 11, be-.

mg in greater part reflected ahead and downwardly onto the road ahead of the vehicle. 'Oniy a very small portion of the light re Heated comes directly into the range of vision of the driver of an approachin vehicle,

and all of the blinding glare norma 1y caused by rays of light passing from the filament to the lower portion of the reflector and thence upwardly and ahead into the eyes of the hicle.

"Iii Figs. 2 and 3 I have shown the shield 4 and filaments?) and 7 as differently positioned in the bulb, the construction shown in Fig. 2 having the filaments projecting in front of the post 3 equal distances and '10- cated each the same dlstance above and below the horizontal center line of the bulb.-

In Fig. 3 the upper filament is extended tarther ahead of the post 3 and is positioned farther away from the horizontal center line of the bulb than the lower bulb. This is a preferred construction, but the invention contemplates all such equivalent modifications.

I have shown and described a preferred form of my invention and one which can be easily applied to the various standard types of motor vehicle headlights now in use. The construction is relatively sim le and the bulbs can be manufactured andinstalled at low cost. Many changes in minor details of construction may be resorted to without departing from my invention and, accordingly, I do not wish to be limited to the exact specific structure disclosed, but consider myself entitled to all modifications which fall within the scope of the appended claims defining the invention.

I claim:

1. An electric lamp including a bulb, a

shield of light ray intercepting material projecting into the bulb at one end thereof, and separate filaments located at opposite sides of the shield and terminating short of the end thereof, said filaments being adapted to illumine different portions of the bulb and the said shield being adapted to intercept rags of light from one filament when the ot er filament is unlighted, and separate electrical connections carried by the bulb for enabling the filaments to and simultaneously lighted.

be separately 2. In a light bulb, upper and lower light filaments adapted to be separately lighted, and a member of trough-like form located within the bulb between the filaments and within which the upper filament is positioned, said member being of light ray intercepting material, substantia ly as described.

An electric lamp designed to be located in substantially a horizontal position and including a bulb having a neck, a post projecting inwardly from the neck into the bulb, a shield extending substantially horizontal from the post, said shield being formed of light ray intercepting material, separate filaments carried by the post and positioned respectively above and below said shield and adapted to illumine different portions of the said bulb, said shield being adapted to intercept the rays of one filament when the other filament is unlighted, and separate electrical connections carried by the bulb and connected with the filaments to enable the same to be independently and simultaneously lighted.

4. An electric lamp including a light bulb designed to be arranged in substantially horizontal position and having a neck, a glass post extending into the bulb from said neck, a glass light ray intercepting shield extending from the post into the bulb and formed integral with the said post, separate filaments carried by the .ost and located above and below the shiel and adapted to illumine different portions of the bulb, said shield being adapted to intercept the rays of light from one filament when the other filament is unlighted, and separate electrical connections carried by and extending into the bulb for enabling the filaments to be simultaneously and independently lighted.

'5. An electric lamp including a light bulb designed to be disposed in substantially a horizontal position, a light my interceptin shield extending into the bulb at one en thereof, two separate filaments of substantially equal lighting capacity located at 0pposite sides of bulb being provided with separate electrical connertions for enabling the filaments to be simultaneously and independently lighted. In testimony whereof I affix my signature.

. ANDREW A. FLORY.

the shield and adapted to I illumine different portions of the bulb, said

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