US1522001A - Head for constructing incandescent electric-lamp stems - Google Patents

Description

Jan. 6. 5- 1,522,001

C. EISLER HEAD FOR CONSTRUCTING INCANDESCENT ELECTRIC LAMP ISTEMS.

Filed March 9, 1924 2 Sheets-Shee't '1 v INVgFNTOR v gar/e6 wF/e/ ATTORNEY-Z37 Jan. 6. 1925. 1,522,001

c. El'sLER HEAD FOR CONSTRUCTING INCANDESCENT ELECTRIC LAMP SIEMS- Filed March 29. 1924 2 Sheets-Sheet 2 A TTORNE Y Patented Jan. 6, 1925. i

CHARLES EISLER, OF NEWARK, NEW

HEAD FOR CO'NSTR'U'CTING INCANDESGENT ELECTRIC-I'm STEMS.

Application filed March 29, 1924. Serial No. 702,763.

To all whom it may concern:

' Be it known that I, CHARLES EIsLER, a citizen of the United States, and a resident of Newark, county of Essex, and State of New Jersey, have invented a new and useful Improvement in Heads for Constructing Incandescent Electric-Lamp Stems, of which the followingis a specification.

. My invention relates to apparatus for the construction of .incandescent electric lamp stems, and particularly to a head for assembling and uniting the parts of stems to be used in tipless incandescent electric lamps, that is to say, lamps having no sealing tip or teat in the head of the bulb.

, The stem s for such lamps are made up of,

four parts,

which, in the operation of the "device of the present invention, are held and welded together, the product of such assembling and welding operation being collectively designated. as a stem. The stem parts comprise a piece of glass tubing flanged outwardly at one end and designated as a flare, a sealing oif tube inserted into the flare from the flanged end, a pair of electric current lead wires, and a glass rod or cane inserted in the flare from the opposite end thereof and serving to support the lamp filament.

In making an incandescent lamp stem, the

glass rod or cane is inserted a short distance into the flare through its straight or inner end, the small diameter lass sealing off tube is inserted into the are through its flanged end up to about the glass rod, and the lead wires are passed through the length of the flare, so that they project a substantial distance from both ends thereof. lVith the parts so'held in assembled relation, heat is applied to the straight end of the flare and the heated parts are united by being pressed together while hot. While the closed portion of the flare is still hot, com pressed air is forced inwardly through the sealing ofi tube, resulting in an aperture being blown in the wallof the flare and forming a continuation .of the bore of the glass sealing off tube.

The completed stem' is adapted for use by incandescent lamp makers, who, after mounting the filament structure on the glass rod or cane and connecting up the lead wires, insert the stem into the mouth of the lamp bulb and seal it thereto'by application of heat. The air in the bulb is then exhausted or replaced with a suitable gas parts making up 'wires, which is known as through the. aperture in the flare. The sealing 01f tube is sealed oif and the metallic socket portion of the lamp is inserted \in place thereon, completing the electric lamp. The present invention, however, relates only to the making of the stem, and is not concerned with the subsequent steps of completing the lamp.

My improved device for making the tipless lamp stems, is known as a head. In the machine in which these heads are preferably used, a number of the heads are mounted on a.- rotating plate, and the successive operations in the making of the stems are performed as the revolving plate brings each head into a particular position with respect to blow torches and other devices mounted preferably on the machine base on which the revolving plate and the heads ,are mounted. Except at the loading and to for facilitating the successive operations,

such as by moving each head independently into the desired positions, or by moving the heating and other devices with respect to stationary heads, 7 these movements. Such' machine as a whole is not of the present invention, which relates particularly to the heads for use in machines of this general character.

An object of the invention is to provide means for efliciently bringing together and holding in assembly relation and uniting the the entire stem, all in one head, without resorting to a multiplicity of machines and operations.

or by a combination of y I Another object is to provide a simple,

compact and inexpensivedevicewith a few simple adjustments for making stems of various sizes and shapes, which could hereto-- fore be accomplished only by expensive hand labor and an expenditure of considerable time and effort.

One feature of the invention is a novel means for holding the sealing oif tubesu'spended in position in the flare during the operation of closing the flare end and embedding thereinv the tubing, rod and lead the welding operation. This tube suspending device is so arranged that the operations of moving means broken away. Fig. 3 is a plan view sameinto i positions for, pending thetube within the respectively, I susflare, and for carrying same out of the way to permit re- .moval-ofthe completed stem, and of clamping and unolamping the tube-.may be carried' out manually in a simple manner and 7 preferably by simple movements of one hand of the operator. While the device is described herein as is understood that mechanical or other movement may be employed for the same purpose,

and with the same result.

Other features of the invention will be referred to in the following description.

. In the accompanying drawings, I have.

illustrated an embodiment of my invention,

-' but it is to be understood that the apparacross-section on the line 5-5, Fig. 1.

of a stem head with the tube holding means in alignment with the other stem parts and a a tube inserted therein. Fig. 4 is a plan view, with theitube holding means swung into an out of the'way position. Fig. 5 is a Fig.

6 is a cross-section on the line6-6, Fig. 1. Fig. 7 is a front elevation of the pocket member for receiving the filament cane and lead wires. Fig. 8 is a cross-section of the pocket member on the line 8-8, Fig. 7

showing a completed stem in place therein Fig; 9 is a detail view of a modified form of pocket member, and Fig. 10 is a. cross-section of the tube holding means on the line 10-10, Fig. 3.

In general the operation of the device of my present invention is as follows:

A glass rod is placed into the central bore of the pocket member, with its upper end projecting'somewhat therefrom, and a flare is inserted with its flanged end uppermost -into a pair of clamping jaws and with its straight end resting on the pocket member, so that the rod extends for a short distance upwardly into the flare. Twol lead wires are inserted through the flare into smaller bores provided therefor in the pocket member, one om each si'deof the centralbore. A

. slender glass tube is placedin a jaw holder provided for this purpose and same is held in suspended position from above the flare,

with its lower end extending the'reinto.

Heat is applied to the lower end of the flare by a blowtorch and when the parts are 'sufiiciently hot, a pair of press aws compress the lower end of the flare, closing it up and embedding therein the glasstube, rod and lead wires. Compressed air is then being operated manually, it

mas er forced inwardly into the glass tube, resulting in an aperture being blown in the flare wall in the vicinity of its closed end. The stem is allowed to'cool slowly so as to avoid cracking, and is removed from. the stem head- Fora better understanding of my invention, reference may now be had to the drawings,"which show in'detail anembodiment of my invention.

The stem head frame 10 is of generally T-shape. Same is preferably a metal casting and comprises a shaft portion 12, adapted'to turn'in a suitable bearing .ina rotating plate or the like (not shown), and is provided with a pinion 14 and a bearing collar 16. From the bearing collar 16 a pair of separated standards 1 8, 18 extend upwardly and are joined by the cross-head 20. The cross-head portion 20 is provided with a bore 22, and a bore 24 in alignment with bore 22 is provided in the collar and shaft portion 16, '12 of frame member 10.

Means are provided for holding the glass cane 26 and lead wires 28, 28 inplace, comprising a pocket member 30, adapted to be received in the bore or recess 22 in the cross head 20 of frame 10, and same may be fastened therein by set screw 32. (Fig. 4). Pocket member 30 is tapered off at each side of its upper end, as, shown at 34, 34, and has a central bore 36 therein to receive the cane 26. Smaller bores 38, 38, one on each side of bore 36, are provided in pocket member 30 to receive the lead wires 28, 28. The bore 36 of pocket ,member 30 is enlarged at its lower portion, as indicated at'40. Said enlarged bore part- 40 receives the guide pipe 42, fastened in pocket member 30 by set screw 44, and having a central bore 46 forming abore 36.

The guide pipe 42 isprovided with slidable gauge and stop devices for the glass cane 26 and lead wires 28. Lead wires 28 preferably extend somewhat beyond the end of the cane 26' to provide suflicient length for making the filament connections. In the form shown, guide pipe 42-is provided with a diametrically extending longitudinal slot 48. The stop or guide member 50 serving as a stop or gauge for the lead" wires 28 is preferably of substantially cup form provided with a recess 52 and a bottom opening 54 of form adapted to receive and slide on the guide pipe 42. A'pin 56, preferably a cotter pin, extends through openings 58 in the upper portion of cup 50 and through the slot48 in guide pipe 42. Such pin 56 serves two functions itacts as a stop'or gauge for the cane 26.,"and also-serves to .position the bottom wall 60 off-recess 52 a suitable. distance beyond the end of Gene 26, so that the lead wires 28, extending to the bottom wall 60 of cup recess 52, may project for a. suitcontinuation of pocket member bore 36', length of mounted in bore 36 of bores 38, 38

able length beyond the end of cane 26 and be suitably secured'to the filament wires. Means, as the set screw 62, are provided for adjustably holding. these parts in adjusted position. Any desired length of glass cane 26 with the suitable somewhat longer length of lead wires can be secured by moving the parts just described up or down on the guide pipe 42 and securing them in place bythe set screw 62.

When it is desired, as with certain forms of lamps, to make stems having no glass cane or a short one, and short lead wires, a pocket member 30, such as shown in Fig. 9, is used. Pocket member 30has a central bore 36 through its entire length, and two smaller bores 38, 38, one on each side of going only partially through the pocket member 30.- The depth gauges the length of the are receivedtherein, and glass cane received in bore agauge pin- 56 slidably and fastened therein in by a. setscrew. A transis provided in pocket member lead wires which the length of the 36- is gauged by any desired position verse slot 48 30' to assist in setting pin .56 for gauging the length bore 36". 1

The means for holding the flare in place comprlse a pair pivoted at 68, 68 working in slots 70, 7 0 in the horizontal arms 72, 72 of the crosshead member 20. The clamping jaws 74, 74 of clamping levers 64,

of the glass cane entering 66 have V-sha-ped notches 76 in their gripping faces, in which the flare 78 is held. Clamping jaws 74, 74 are removably fastened to clamping levers 64, 66 by screws 80, so that flares of varying tours can be clamped therein by simply replacing jaws 74 with jaws of the appropriate size or shape. The pivoting portion 82 of clamping lever 66 has a tooth 84, which registers with a notch 86 inpivoting portion 88 of clamping lever 64, so that both clamp-. ing levers 64, 66 are operated upon manually pressing together knobs 90, 90. Spring 92, hooked into perforated lugs 94, 94 on clamping levers 64, 66, serves to exert a spring tension on the clamping levers 64,66 to-hold a flare inserted therein, and also to return clamping levers 64, 66 to their closed position when the flare is removed therefrom. The dotted lines in Fig. 1 indicate the fully opened position of clamping levers 64, 66 ready for insertion of the flare 78 therein.

The means for closing the straight end of -the flare after same is heated and embedding therein the rod, tubeand lead wires, comprise a. pair of pressing jaws 96, 96, pivoted at 98, 98 on extensions 100, 100 on the crosshead portion 20. Press jaws 96, 96 are actuated by links 102, 102 pivotally connected at of clamping levers 64, 66, in the standards 18, 18, and

diameters and conto cross-bar 104'. Bar 104 is mounted on slide bar 106, which slides in recess 24 in the shaft portion 12 of frame 10. To close press jaws '96, 96, as shown in solid lines in Fig. 2, slide bar 106 is pushed upwardly, as by a cam 01' other means, and when the upward pressure on slide bar 106 is removed, the press jaws 96, 96 will open by gravity into the position shown in dotted lines in Fig. 2, due to the fact that the link 102 is pivoted to the press jaw 96 at a point well outside the pivot point 98 and never comes to or passes. a dead center. Thus the necessity of an additional spring or other device to return the press jaws 96, 96 to their open posiadapted to turn in a sleeve 116 .upon the manual application of comparatively light pressure thereto. mounted to turn in bearings 118 and 120 in extensions 122, 124 respectively of frame 10, but is so arranged as to require for its turning the application of a. considerably increased manual pressure, as compared with that sufficient for turning shaft 114.

One mode of securing this providing sleeve 116 with notched out parts or recesses 126, 128, which are adapted to beengaged by a ball 130 spring pressed toward sleeve 116 by spring 132'located in a recess 134 in extension 124 of frame 10. In this way the holder 112,is releasabiy held in position over the pocket member 30 and in swung away position respectively.

Tube holder 112 performs three separate and distinct functions making the stem; first, clamping and holding the glass tube 111 during the welding operation,- as shown in Fig.

Such sleeve 116 is itself result is by during the course of- 3, second, re- I lease of the glass tube and swinging laterally out of its place over the pocket member 30 at the completion of the welding operation, as shown in Fig. 4, so that the stem may be lifted out'of. the pocketmember;

and third, return of the holder 112 with its jaw closed, into position directly over the clamping jaws and in readiness to be opened to take and hold the tube for making the next lamp stem. I j The manual actuating device for the tube holder is so arranged and constructed that its several movements may be performed by the use of one hand or digit. Said tube holder 112 is manually actuated by a crank handle 136 fastened tothe lower portion of above yoke 140, and turns with shaft 114.

A movable jaw 150 is pivoted in slot 152 formed between the arms 154, 154 of yoke 140, and is connected to crank 146 by link 156, so that partial rotation of shaft 114 causes opening and closing of movable jaw 150 against fixed jaw 142.

A stop for the return movement of pivoted jaw 150 is provided, as by same coming into contact with the base of the slot 152 in yoke 140. The pivoted jaw 150 is normally.

held toward or against fixed jaw 142 by means of a spring 158 encircling the lower portion of shaft 114, and held by one end in recess 160 oficrank handle 136 and by the other end being received in a recess 162 in extension 164 on frame 10.

-To perform the first movement of holder 112, namely, the insertion therein of a. glass tube 111, handle 136' is "moved inwardly slightly against the tension of spring 158,

causing a partial turning of shaft 114 in its sleeve 116, and causing pivoted jaw 150 to move away from fixed jaw 142 and the glass tube 111 is manually inserted between the jaws 142 and 150. Upon release of handle 136, the aws with the glass tube 111 in place therein are held closed by spring 158. In this first movement, sleeve 116 and yoke 140 fastened thereto remain stationary, the only parts set in motion being shaft 114, crank 1,46 fastened thereto, link 1556 and movable jaw 150. I I

Upon completion of the welding operation, it is necessary not only to open jaws 142 and 150 to release glass tube 111', which is now a part of the completed stem, but

also to swing holder 112 laterally away from the clamping jaws 7 4 so that the completed stemniay be lifted out of the stem head.

The first of,these functions is accomplished by'an application of light manual pressure.

to crank handle 136, which imparts rotation to shaft 114 to open jaws 142 and 150 to release rod 111. This brings movable aw 150 into contact with the base of slot 152 in yoke 140, .and when increased manual pressure is applied to handle 136 to rotate shaft 114, movable jaw 150 bears hard against the base of slot 152 causing yoke 140 to turn with it, thereby overcoming the holding effect of spring tensionedball 130, which was in recess 126, and rotating sleeve 116 in itsbearings 1'18, 120, whereby holder 112 is swung into the position shown in Fig. 4 in which it is awayfrom" over the flare clamping jaws 74, 74. Holder 112' is releasably held, in this swung away position by ball 130 engaging-thesecond recess 128 in sleeve 116.

.136 is moved outwardly or away from the stem head by application of pressure thereto. The rotation of shaft 114 in the direction opposite to that when opening, jaws 142 and 150, causes movable jaw 150 to bear hard against fixed jaw 142, thereby moving yoke 140 and sleeve 116-with. it, against the pressure of spring t'ensiojned ball 130,'which is moved out ofrecess-1'28. and engages .rece ss 126-when the holder 112 is in the fully returned position.) Agpositioning stop 166 is adjustably fastened to'sleeve 116 by set screw 168, so that when holder 112 is in position to hold the tube 111 in alignment with the clamping jaws. 74, as during the welding operation, itsfiat face 166' abuts against the flat-surface 170 of extension 17 2 on frame 10, as clearly shown in Fig. 5...'

The 'operation of a machine comprising a plurality of stem heads is very simple. Thestem heads containing the stem parts spring clamped in place as above described are preferably axially rotated, as by the pinion 14 on the shaft-portion 12, during the making of the stems, except when they reach the emptying and reloading station. This is so as to insure uniform heating of the flare and stem parts preliminary to and during the welding operation, as well as during the annealing of the stem after the welding operation and before removal thereof from the stem head. This reduces to a minimum the possibility of-cracking of the stems "and-results in the producfion of a high-gradeproduct with but small oss.

When the stem head reaches the discharge and loading station, it ceases its axial rotation and the operator removes the completed stem and reloads thehead by manual insertion of a glass rod and two lead wires in the pocket member, a flare between the clamping jaws, and a glass tube in the tube holder. The loaded stem head now begins its axial rotation and is moved away from the operator and into-position before one or more blow torches, where the stem parts are given a preliminary heating. The stem head is next moved into positionbefore a istronge r' fiame and when the flare end to be closed and the stem parts are sufiiciently hot, the press jaws are'momentarily forced together by a cam or other means, closing the flare end and embedding therein the rod, tube and lead wirns.'- Compressed air is forced inwardly through, the tube until an aperture is blown in the flare wall and communicating with the bore of the glass tube. For annealing the stem,'it is brought before one orimore blow torch stations havinitial movement ing flames of decreasing intensity, so as to avoid uneven or too rapid cooling of the stem. lVhen the stem head with the completed and partially cooled stem therein reaches-the discharge and loading station, the operator manually removes the completed stem and reloads the stem head with parts for making the next stem, and this cycle is repeated indefinitely.

I claim 1. A turnable holder for the sealing tubes of incandescent lamp stems having means for releasably locking it in two positions, a spring closed clamp carried by said holder, means for turning the holder into one or another of such positions. and means for opening the clamp against its spring by of the holder turning means.

2. In a holder for a lamp stem part comprising a pair of jaws, means including .a shaft for operating said jaws upon manual application of light pressure to permit insertion of a stem part therebetween, and

means including a sleeve in which said shaft is mounted to turn to a limited extent for bodily moving the holder out of alignment with the other stem parts upon manual application of greater turning movement to said shaft. I

3. In a holder for a lamp stem part comprising a pair of jaws, means including a shaft for operating said jaws upon manual application of light pressure to permit insertion of a stem part therebetween, and means including a sleeve in which said shaft 'is mounted to turn to a limited extent for bodily moving the holder out of alignment with the other stem parts upon a continued manualapplication to said shaft of greater turning movement. 4Q In a holder for a lamp stem part comprisinga pair of jaws, means including a shaft for operating said jaws upon manual application of light pressure to permit insertion of a stem part therebetween. means including a sleeve in which said shaft is mounted to turn to a limited extent for bodily moving the holder out of alignment with the other stem parts, and means for releasably retarding the movement of said sleeve during the application of light pressure.

'5. In a holder fora lamp stem part'comprising a pair of jaws. means including a shaft for operating said jaws upon manual application of light pressure to permit in ,sertion of a stem part therebetween, means including a sleeve in which said s ft is mounted to turn to a limited extent for bodilymoving the holder out of alignment with theother stem parts, and means including a spring tensioned ball for releasably retarding the movementof said sleeve during. the application of light pressure. f

prising a fixed and a 6. In a head for assembly and welding together of incandescent electric lamp stem parts, a spring closed clamp for holding a stem flare, a pocket member for holding a filament cane and a pair of lead wires to extend within the flare, and a tube holder swmgable into positions over and laterally R gether of incandescent lamp stem parts, a

flare clamp for receiving and holding a flare, a pocket member for receiving and holdlng a filament cane and lead wires, and a tube holder movable into and out of alignment with said flare clamp and pocket member.

8. In a stem head for incandescent lamp stem making, a rotatable clamp carrying member, a tube holding clamp carried thereby comprising a pivoted jaw, and means for initially turning said jaw on its pivot and thereafter rotating the clamp carrying memben 9. A holder for a lamp stem part comprising a pair of jaws, a sleeve and a shaft rotating therein, means operated from said shaft for opening said j awsby a light manual application of pressure, and holder turning mean-s operated from said shaft whereby a continued application of greater pressure "will cause the lfolder to move bodily out of alignment with the other stem parts.

10. In a holder for a lamp stem part comprising a pair of jaws, a'sleeve and a shaft rotating therein, means on said shaft whereby upon application of light manual pressure the jaws are operated, and whereby upon continued application of increased pressure the holder is moved bodily out of allgnment with the other stem parts, and

takes place in advance of the sleeve movement.

11. In a holder for a lamp stem part comprising a fixed anda pivoted jaw, a sleeve and a shaft rotating therein, means on said shaft for actuating the pivoted jaw upon application of light manual pressure, and means on .said sleeve whereby upon continued application of increased manual pressure to the pivoted jaw causes the holder to move bodily out of alignment withthe other stem parts; I

12. In a holder for a lamp stem part compivoted jaw, a sleeve,

a shaft rotating therein and a sprlng on said a shaft, means von said Shaft for actuating the tension of said pivoted jaw againstxfhe of light manual spring upon application pressure, and means on said sleeve whereby continued application of, greater manual pressure to said shaft, the pivoted jaw is actuated to cause the holder to move bodily out of alignment with the other stem parts.

13. In a holder for a lamp stem part comprising a fixed and a pivoted jaw, a sleeve,

' sleeve whereby-upon continued application of greater manual pressure to said shaft, the open pivoted jaw causes the holder to move bodily out of alignment with the other stem parts, and means comprising aball and 4 of incandescent lamp stem parts, a sprlng closed clamp for holding a glass flare with a spring to retard the movement of said sleeve and hold same-in the positions into which it is'movec'L.

l4. A holder for a lamp stempart comprlsinga sleeve, ayoke and a-fixed jaw on said sleeve, a'shaft adapted to rotate in said sleeve, a spring on said shaft, and a movable jaw pivoting in said yoke and registering with the fixed jaw, a crank on said shaft, and a link connecting said crank with said movable-jaw, whereby'upon application of light manualpressure to turn said shaft the movable jaw is turned on -its-pivot against the tension of said spring and upon con-; tinuing and increasing thelmanual pressure the movable jaw is brought into engagement with said yoke. member carrying the holder with it out ofalignment with the other lamp stem parts. 40 prising a pair of'jaws, a sleeve having re.-..

15. A holder for a lamp stem part com- I cesses thcrem a shaft rotating in saidfsleeve,

I a ball, adapted to enter the recesses inthe application part clamp,

sleeve, and a'spring adapted to hold said ball toward the sleeve recesses, thereby retarding rotationv of said sleeve and requiring of substantially high manual pressure to dislodge said ball from the particular recess in which it is seated.

16. Ina head for assembly and welding together of incandescent lamp stem parts, a flare clamp and pocket member for receiving and holding a flare, a filament cane and lead wires, a tube holder comprisingapair of spring closed clamping jaws movable to 'bring said clamping jaws into andoutof alignment with said pocket member, and 'a common operating means for opening the jaws against the tension of the spring and for moving the holder tocarry the jaws thereof laterally away from the .pocket member. I v

17 In a head for assembly and Welding its-flaredend up and its straight end down, means for holding a filament cane and filaholder comprising a rotatable sleeve-springv holdheld in two positions and having thereon a clamp supporting member carrying a twoa cranked shaft extending through the sleeve and arranged uponbeing turned to first actuate the clamp in the clamp supporting member and thereafter in a continuation of like movement to effect the turning-of the sleeve to bring the clamp supporting. member. and clamp thereon laterally out;

of position over the flare holding. clamp.

In testimony whereof, I have signed my nameheret'o. Y g

fonnntns sienna;

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