US469483A - Island - Google Patents

Description

' (No Model.)

F. H. MANCHESTER. INGANDESGENT LAMP.

No. 469,483. Patented Feb.'23, 1892.

WITNESS-E5: INS/INTER 54%{522Zt 7' 94/ W UNITED STATES PATENT OFFICE.

FREDERIC H. MANCHESTER, OF PROVIDENCE, RIIODE ISLAND.

INCANDESCENT LAMP.

SPECIFICATION forming part of Letters Patent No. 469,483, dated February 23, 1892. Application filed November 4, 1891. Serial No. 410,821. (No model.)

To aZZ whom it may concern:

Be it known that I, FREDERIO H. MANOHES: TER, of the city of Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Incandescent Lamps; and I hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification.

This invention has reference more especially to improvements in the bases in which the glass bulbs of the lamps are permanently secured and which are adapted to be secured in lamp-sockets having a central contactpost and a circumferential contact-plate.

The object of this invention is to produce a base for incandescent lamps which will be more durable than those heretofore manufactured and reduce the cost of the same. To attain these ends, I have invented a lampbase provided with an insulating plate formed of porcelain, together with certain novel features of construction and peculiar combination of parts, which will hereinafter be more particularly described, and pointed out in the claim.

Figure 1 represents the improved base secured to the bulb of an incandescent lamp. Fig. 2 represents a top view of the base. Fig. 3 represents a vertical sectional view of the base, taken at a line a, b, Fig. 2, showing the manner in which parts of the base are secured together and connected with the lampwires.

Similar numbers of reference designate corresponding parts throughout.

In the drawings, 5 indicates the shell of the base. This shell is spun up from sheet metal and has the corrugations 6 pressed. from the thickness of the metal and forming a screwthread, by which the base and the bulb held therein are secured in the lamp-socket. The lip 7 is provided at the upper portion of this shell and is bent over the thin edge of the insulating-plate to secure the same to the shell. The insulating-plate 8 is formed of porcelain and is circular in shape, having a thin edge 9,-over which the lip 7 of the shell is bent, and a central boss 10, which is perforated vertically, the perforation extending through the thickness of the insulating-plate into the cavity 11 in the under side thereof.

A side perforation 12 is also formed through the thinner portion of the plate 8. The perforated cap 13 fits closely around the edges of the boss 10 and is secured in place by the tube 14, the flange 15 of which fits into the cavity 11, while the upper end extends through the perforation of the cap 13, over the edges of which it is expanded, drawing the upper surface of this cap downward and forming a slight concaved recess. The lampvvire 16 extends through the perforation 12 and is secured, preferably by solder, to the cap 13, while the wire 17 is secured to the metal shell 5, these wires being connected to the filament of the lamp. hen this base is secured to a screwsocket, the shell 5 is connected with the inner shell of the socket and thence to one pole of the electric circuit, and the upper edge of the tube 14 is forced into contact with a pin or plate connected with the other pole of the electric circuit. The porcelain insulating plate 8 can be made smaller and less cumbersome than when made of Wood and may be more securely fastened.

to the shell 5 bysimply spinning the lip 7 over the thin edge of the plate, as this plate can be molded complete in shape, and with the perforations formed therein the cost of manufacture is greatly reduced. At-the same time an insulating-plate is formed which will not become loose from shrinkage and which will not retain sufiicient moisture to occasion a short circuit of the electric current.

Having thus described my invention, 1 claim as new and desire to secure by Letters Patent In an incandescent lamp, the combination, with the base 5, having the corrugations 6 and lip 7, of the porcelain insulating-plate 8, secured within said lip and having a side perforation 12 and a central perforated boss 10, a metal cap 13, covering said boss and secured in place by the flanged tube 14, extending through said perforation, and wires adapted to connect said shell 5 and cap 13 with the lamp-filament, as described.

In witness whereof I have hereunto set my hand.

FREDERIC H. MANCHESTER.

Witnesses:

HENRY J. MILLER, M. F. BLIGH.

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