US366352A

US366352A - Incandescent electric lamp

Info

Publication number: US366352A
Authority: US
Publication date: 1887-07-12
Anticipated expiration: 1904-07-12

Description

(No Model.)

E. P. THOMPSON.

INGANDESGENT ELECTRIC LAMP.

No. 366,352. Patented July 12, 1887.`

a @M awww@ `UNITED STATES PATENT OFFICE.

EDVAED P. THOMPSON, OE ELIZABETH, NEV JERSEY.

INCANDESCENT ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 366,352, dated July 12, 15387.

(No model.)

To all whom, it may concern:

Be it known that I, EDWARD I). THOMPSON, acitizen of the United States, residing in Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvementsin IncandescentElectricLam ps, of which the following is a specification.

The invention relates to the construction of globes for incandescent electric lamps, especially the globes for lamps employing large carbon filaments.

The object of the invention is to reduce as much as possible the space necessary to be evacuated.

The invention consists, in general terms, in

l inserting within an outer globe an inner globe or tube which shall occupy the space within the alms of the filament, and in providing a fixture with a projection fitting within the tube, and also in employing a non-incandescing conductor connected with the respective supply-conductors for neutralizing the static charge of the filament. A

In the accompanying drawings, Figure l is an elevation of a globe embodying the features ofthe invention. Figs. 2 and 3 show certain details.

Referring to the figures, A represents an outer inclosingglobe of glass designed to contain the filaments I?. This globe is open at one end, as shown at a, the sides being preferably drawn in upon the opening. A tube, O, has its end flaring slightly, as shown at c. This is designed to be inserted through the opening a, with its edges coming in contact with the edges ofthe globe A, The two globes are sealed together along their adjacent edges, t-he leading-in wires being sealed in the joint.

This may be accomplished by any of the well- Y The filament is may with advantage be silvcred upon its surface, or in any other convenient manner made capable of diffusing the light from the lamp. The block is provided with two contact-pieces, f and f2, designed to be connected with two leading-in wires. Supply-conductors L and LZ lead, respectively, to these contact-pieces. For the purpose of causing the loose carbon which is thrown off from the filaments of incandescent lights to be attracted toward and deposited upon the surface of the inner globe, one ofthe conductors-L", for instance-may with advantage be connected through wire Z2, laid near the surface or just beneath the surface of the projection F. In this manner the inductive effects of the current traversing the coil Zl will attract the particles of carbon toward itself.

Suitable clips or springs, g', are placed in the side of the projection F, for the purpose of holding the globe in position.

It is evident that there are various ways of modifying the 'shape of the two globes without departing from the spirit ofthe invention; but preferably a globe having its sides approximately straight is used for the outer globe, as well as for the inner one.

Instead of the hooks shown in Fig. 3 for making electrical co inections with theleadingin wires, any suitalile form of pressure-clips or contact-plates may be employed.

I claim as my invention- 1. The combination of the outer inclosingglobe of an incandescent lamp, atube orglobc projecting within the same, and a fixture for receiving the lamp having a projection iitting within said tube, substantially as described.

2. The combination, with an incandescent electric lamp having a tube projecting within the arms of the lament, of a tixture having a projection extending within said tube, which projection is coated with light-diffusing substance, substantially as described.

3. The combination, with an incandescent electric lamp having its wall extending inward between the arms of a filament, of a projection designed to extend within such portion of the wall,and a conductor connected with a supply-conductor applied to the projection, substantially as described.

IOO

4. The combination, with an incandescent- ,ors and extending Within the arms of the filaeiectric lamp, of a non-incandescing conductor ment, substantially as described.V connected at its respective ends with the re-. In testimony whereof I have hereunto subspective supply-conductors, and extending in scribed my name this 17th day of August, A. 5 a. direction approxiateiv'mraliel with the D. 1886.

lament.

5. The combination, with an incandescent EDWARD P THOMPSON. electric lamp having its Wall extending in- Witnesses: v ward between the arms of the lament, of a DANL. W. EDGECOMB,

1o conductor connected with the supply-conduct CHARLES A. TERRY.