US1946104A

US1946104A - Electric lamp

Info

Publication number: US1946104A
Application number: US258955A
Authority: US
Inventors: Ohara Tsuneto; Honda Ko
Original assignee: KANICHIRO MATSUKI
Current assignee: KANICHIRO MATSUKI
Priority date: 1928-03-03
Filing date: 1928-03-03
Publication date: 1934-02-06
Anticipated expiration: 1951-02-06

Description

Feb. 6, 1934.

'r. OHARA r AL ELECTRIC LAMP Filed March 3, 1928 Patented Feb.

UNITED STATES PATENT OFFICE Emao'raio LAMP Kotaro Enomoto, and K0 Honda, assignors of one-fifth to Kanichiro Matsuki, Tokyo, Japan Application March 3, 1928. Serial No. 258,955

Tsuneto Ohara,

Tokyo, Japan,

1 Claim.

of them is disposed on the periphery of the neck portion and the other is mounted on the end of the neck portion.

It is the object of the present invention to provide an incandescent electric lamp which is more durable and lower in cost than present forms of electric lamps and can be handled with greater convenience than the types of electric lamps now known.

Incandescent electric lamps having their bulb portion and neck portion integral have been proposed before. Usually,

however, such lamps have been so constructed as to necessitate a spring member. or other metal member, for establishing contact with the filament. In consequence, such bulbs have been quite expensive because of the greater labor and care required in their manufacture.

The advantages inherent in the elimination of the usual metal base have therefore been more than balanced by the disadvantages of the increased cost.

on the other hand.

The present invention, concerns the provision of an incandescent lamp having its bulb portion and its neck portion formed of a single piece of glass and having its filament terminals so mounted as to permit the use of the bulb in the The fact that the lamp bulb 'is of lamp socket. formed of a single usual form piece of glass, instead of a number of separate portions joined together, makes it considerably stronger and more durable than previous forms of lamp bulbs made entirely of glass and, furthermore, the mounting of the filament terminals in such a manner as to form of lamp bulb can considerably lower the bulb in a standard socket,

the present improved type of and all. occasions where 'the base lamp bulbs are ordinarily entirely of glass, the present be manufactured at a cost than lamp bulbs requiring a metal base, and due to the smooth surface of the glass neck portion,

a lamp bulb of the type contemplated by the present invention can be more readily mounted and disconnectedfrom a lamp socket than the various forms of all glass lamps heretofore in use.

For a better understanding of the invention,

reference is made. ing wherein:

to the accompanying draw- Fig. 1 is a side view of a lamp in accordance with the invention.

Fig. 2 is a longitudinal section of the lamp shown in Fig. 1.

Referring to the lamp is of the us portion a enclosing drawing more in detail, the ual shape'having a bulbous the filament, and a neck porimprove the lighting characteristics of the lamp.

the filament supporting tion 19 formed integral with the portion a and providedwith a screw threaded surface at to permit the mounting of the bulb in a customary form of socket. As shown in Fig. 2, the neck portion b and the bulbous portion a are integral and formed of a single piece of glass.

The filament is supported inside the bulb a by means of a filament supporting tube extending inwardly into the neck portion. In its final form, shown in Fig. 2, the tube is joined to the neck portion b at the end thereof so as to provide a continuous structure of glass. The lead wires 0 from the filament extend through the supporting tube toward the end of the neck portion 1), one of the lead wires terminating'in a terminal mounted on the periphery of the neck portion an-dthe other lead wire ending in a terminal-so mounted as to close the open end of the supporting tube and provide a substantially flat base for the bulb.

As is evident from the drawing, the bulbous portion a and neck portion b are continuous and so formed as to provide a smooth outer surface having neither a step nor a shoulder of the nature'common to the all glass lamps heretofore filament supportingmounted on the. neck portion b as to eliminate the necessity for any metal contact rings or plugs, thereby simplifying the construction of the lamp. If desired, the neck portion b may be frosted to We claim:

A glass incandescent electric lamp having all except the filament and terminals in one piece. comprising a bulbous portion, said bulbous portion merging into a cylindrical neck portion having external screw threads formed integrally therewith for fittingdirectly the end of said neck beyond the screw threads into a lamp socket,

being turned inwardly to form a hollow filament supporting tube which extends through said neck portion, afilament within the bulb. and a pair of lead wires extending from the filament through tube, one of said lead wires passing through the glass where the neck portion turns inwardly to form the hollow tube and terminating in a filament terminal on the neck portion adjacent the socket end thereof and beyond the screw threads, the other lead wire terminating in a filament terminal located substan-v tially at the center of the inturned end portion of the neck.

TSUNETO OHARA.

KO'IARO ENOMOTO.

KO HONDA.