US1315813A - Method of manufacturing incandescent lamps - Google Patents

Description

M. H. BRANIN.

METHOD OF MANUFACTURING INCANIlESCENT LAMPS.

APPLICATION FILED SEPT 26,1916.

Patented Sept. 9, 1919.

I UNITED STATES PATENT OFFICE.

MARK H. BRANIN, QF NEWARK, NEW JERSEY, ASSIGNOB TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

METHOD or mnnorncrunme Incmnnscmwr LAMPS.

To all whom it may concern Speciflcation of Letters Patent.

Patented Sept. 9, 1919.

Application and September 26, me. Serial in. 122,296.

Referring-Ito the accompanying drawings Be it known that 1, MARK H. BRANIN, in which corresponding parts are designed a citizen of the United States, residing at by corresponding marks of reference Newark, county of Essex, State of New Jersey, have invented certain new and useful Improvements in Methods of Manufacturihg Incandescent Lamps, of which the following-is a specification.

My inven on" relates to the art of manu facturin tages. My invent on; also resides in a novel form of bulbused in the manufacturing process.

It hasheretofore been the practice to blow 'thebulbs for el'ectricla'm sjwith necks-of .cen'siderably' greater len'gt than are necessary in the manufacture of the lamp itself,

suchlInecks' terminating in restricted ends.

1 the mount thereon; and my invention also,

Such restricted-endshave. heretofore,as a preliminary stepjto the manufacture. of the lamp been-broken ofi...to permit the insertion of themountin such necks, and the sealingof'the mount therein. Thisis ob jectionablei both from the fact that the breaking ofi of the end of the neck of the bulb involves 7 an, additional step, and because a considerable loss has resulted from the breakage' of the bulbs in this step. I

propose to construct a bulb ready for the insertion and scaling in of the mount support without necessitating the removal of any part of the bulb prior to this step, and my improved method of manufacture therefore may be said to consist'in so blowing I a the glass atthis. point, which eventually,by

thebulb that the mount may be inserted and sealed therein without substantial intermediate change in the bulb, and in sealing consists in a glass bulb, as an article of manelectric incandescent lamps and, lnfaccor ance therewith I have lmproved the .ufacture, ready for, and adapted to, the insertion of the filament mount therein,

whereby lamp bulbs with formed necks may be shipped from the glass blowing factory to the lamp factory readyfor the sealing operation and thereby eliminating the necessityof the intermediate step of cracking off the restricted necks. I v

According to another feature of my invention, I make the neck of such form and weight that the sealing operationis greatly expedited, thereby increasing the capacity of the sealing machines.

being represented in .neck is then broken 0 I wiper D to .the heated and large ,Zone I), this from the bulbs now commonly employed for that purpose.

- Figs. 5, 6, 7 and 8 retpresent successive steps in the manufacture 0 an electric lamp from the bulb here described.

It will be proper in order that the see e and nature of my invention may be t o better understood, to briefly describe' what is now thecommon practice in the manu- --facture of electric lamp bulbs. The bulb reaches the facto'ry with a neck considerably v greater .in length than is required in the completed article, this terminatin in a restricted portion a, above which 1s an enlar ed zone 1). After a'tube d has been 'sea ed in the bottom of the .bulb for the vpurposeof exhausting it, the neck of the ulb is placed-within heated metal zones B, which, by contacting with the enlarged zone I) of the bulb, heats the sameft his step :1. The end ofthe y applying a et.

bein' shown inFig. 2, and the .resultis the brea 'ng off of the restricted .end of the neck, leaving. the bulb in the shape shown in Fig. 3. A mount E carrying the filament is now insertedin the neck of the bulb, the bulb itself being held with the neck down, and the bulb is passed between burners-F which project a flame upon the neck thereof adjacent to the end of the mount, melting the weight of the neck below, isd rawn out with 'a restriction in diameter, and seals itself to the end of the mount as shown in facture and having a sufficiently great internal diameter to, permit the passage of the base of the mount therethrough. Such a bulb after tabulatiom-fis represented in n the bulb of this shape may be....inserted the filament support without preliminary steps or operations upon the bulb. A filainent so inserted and being sealed is shown in Fig. 7. Withthe use of 'the neck ring shown, the period'of sealing is somewhat lessened due to the fact that the weight of the neck ring facilitates the drawing out of the neck and aids in the restriction in diameter of the neck at, the point where the seal is to be located. This is an improvement over the old way of providing positive means for drawing out the neck. "After the sealing, the result of this restriction is the lamp shown in Fig. 8, which it will be seen is identical with thebulb shown inFigh 5 as the product of the present process.

It will be notedthat my invention calls for no additional operation in the manufacture of the lamp, but eliminates several operations which are now necessary. By so doing, it expedites the manufacture of a lamp, and this is also aided by the increased speed of sealing in, due to the weight of the neck 4. Moreover, it is of value in that it tual use in the manufacture'of electric lamps has been blown wlth a neck ring thereon, but in so far as I am aware, this neck ring and the neck of the bulb itself were not of a of the bulb and not as an incident to the manufacture of the lamp and were necessarily removed from the bulb prior to the insertion of the mount therein.

What I claim as new and desire to secure by Letters Patent of the United States, is:

The process of manufacturing electric incandescent lamps, which consists in blowing a bulb with an elongated unrestricted neck terminating in a ring therearound having substantial weight, and subsequently without substantial intermediate change of the said bulb inserting a filament mount in the neck, heating the neck, and allowing it to be reduced in diameter by the Weight of the ring to seal with the mount."

In witness whereof, I have hereunto set my hand this 21st day of September 1916.

MARK H. .BRANIN.

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