DE1489570A1 - Process for manufacturing incandescent lamps - Google Patents

Description

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TKLXGKRAMMADRXSBX: IfBBTCHKIr, ZWIIBBÜCKBK8TBA8SB IO BA ^ ARIΑΡΑΤΪΚΙ IiORCRIX

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August 31, 1965

IA-1437

description

^f to the patent application; ■■■ · - · ■ TUNG-SOL ELECTRIC INC

Newark, New Jersey / USA

concerning
Process for making incandescent lamps

The present invention relates to the manufacture of lamps, particularly incandescent lamps, and includes a Process that is essential compared to the known processes is easier and the e.s allows Larapen to be produced with pure gas, filling and correspondingly higher quality.

The inventive method bypasses all stages, in lamp manufacture, where the lamp bulb is evacuated. is made. This reduction in the number of operations significantly reduces manufacturing costs and eliminates the risk of oil vapor contamination caused by the Use of vacuum pumps and rotary or oil-sealed rotors. Rotarylemen arise *. In the new process there will be no Extraction pipe required and therefore no seals with butt abutting parts are required and for the Lead wires can be used with other sealing alloys or sealants than copper sheathed wire (dumet).

- 2 909814/0642

The new process therefore not only saves equipment, but also labor and, moreover, excellent results ^ - se achieved. In short, the invention comprises the application a flushing tube around the air from the glass vessel, which the lamp bulb should form, expel and replace the expelled air with a purge gas. The cistern will inserted through an open end of the glass jar and then retracted during melting and pinching of the open end to make the final seal. The insertion speed the purge gas is controlled in such a way that turbulence is avoided. An even gas filling and a Hermetically sealed 'seal of the lamp is according to the invention achieved.

In the following, the invention is illustrated more schematically by hand Drawings explained in more detail using exemplary embodiments: ■ ..

Pig. 1 to 6 successively show steps of the invention Method using the same for the production of a cartridge type lamp;

7 and 8 show the application of the invention Procedure on a single-ended type lamp.

In the drawings the various means of supporting the parts have been omitted as it stands by itself understands that for the production of rotatable lamp types machines are used, which with each process step with

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tel to support the parts.

80 9 8147 0 64 2 " ³

In Pig. 1 is a tubular piston 2 with tapering Neck or end parts 4 shown schematically. This represents the first step in which the casing or the vessel 2 is given to the haschine.

In Fig. 2, the piston 2 is shown with a filament axially arranged therein, which is provided with lead wires 8 and Io extending through the neck part 4. In this process step, the component comprising the glow wire and the supply wires is suitably supported so that it can be arranged within the piston 2. In the next process step, the lower neck part 4 is heated and pressed together in order to fuse the glass together around the feed wire Io and to seal the lower end of the piston. The process steps described so far are common practice in the known and currently used processes for lamp manufacture. The one in Pig. J the process step shown, a suction tube is attached to the upper neck part 4 in a sealed manner in the usual manufacturing processes and the piston 2 is emptied and flushed several times before the final filling with filling gas and the removal of the suction tube.

In the present invention, these various steps are not required and instead, as shown in Fig. 4, is a flush pipe 12 of relatively low Diameter, e.g. 3. of O, IJ cm (0.050 inch) with an opening 0.06 cm (O.OJO inch) through the upper open neck portion 4 • of the piston 2 to close to the lower end of the filament 6

9098U / 0642 _BAD

introduced. An inert gas, such as a gas approximately equal to argon, is introduced into the tube from a suitable source at a relatively slow rate, such as 0.028 vcP / hour (1 cubic foot per hour). During the introduction of the inert gas the upper part is heated to soften the glass and after about \ po seconds the purge tube 12 is raised and removed from the piston 2 while the molten upper neck part k is compressed to seal the piston and the supply line 8 to be determined. The supply of flushing gas is shut off from the piston 2 shortly before the flushing tube 12 is removed. Figure 5 shows this final step of removing the flush pipe and compressing the melted neck portion 4 and pig. 6 shows the finished cartridge-type lamp.

7 and 8 show the method according to the invention Application for the production of small gas-filled lamps with one end, e.g. indicator or reading lamps (readout lamps). In these figures, the flushing pipe 12 extends through an open neck part 16 of a piston 2o up to a Point near the lower closed end of the piston. As can best be seen from FIG. 8, one is at 90 ° 7, the tube 12 extends on the filament 22 and the around the lead wires 26 of the lamp melted glass button 24 over. As in In connection with the cartridge-like lamp described, inert gas is introduced through the tube 12 into the bulb, uui to expel the air and fill the flask with the neutral gas. The Iialteil Ib of the piston is heated and during

9 0 9 8 1 U 0 6 4 2 _BAD OWGHNAL.

H89570

pulling back the tube will melt the neck portion pressed together to seal the piston and the lead wires to be set in the pinch foot.

From the previous description in connection with luit the drawings it can be seen that in the inventive This eliminates the need for many of the steps common in the manufacture of gas-filled lamps, thereby avoiding them these steps have the following advantages over the known manufacturing processes:

1. Vacuum pumps are not required.

2. Avoidance of oil sealed rotary valves like her be used in today's extraction systems.

35. Avoidance of internal oil vapors Lamp parts caused by oil vapors from vacuum pumps and through oil-sealed rotary valves.

4. Avoidance of vacuum connections as is the case with the known suction devices are used.

5. Avoidance of a trigger roll.

G. Avoidance of the exhaust tube tipping over (exhaust tube tipping).

7. Avoidance of seals where the parts butt against each other (butt seals), and consequently the possibility of using other sealing alloys than dumet wire.

9098U / 0642

So far it has been assumed that a pure gas filling in of a lamp can only be obtained after all air and moisture have been completely removed from the lamp and for this reason the known methods have at least two process steps of evacuation. In accordance with the present invention it was found that if the introduction of the filling gas does not happen too quickly, the air and the moisture are released by the introduction of the filling gas can be driven completely out of the piston and that this is accomplished in a relatively short period of time can be. In Flg. 4 and 7 show those from the lower end of the Spü3, pipe 12, the dashed lines emanating from the flow direction indicate first the air in the pipe and then the filling gas, which replaces the air in the course of the process, having.

From the foregoing description it can be seen that the new method of manufacturing gas-filled lamps Not only is it cheaper and easier to make, but it also provides an excellent product.

The features and information contained in the documents are, if they are new individually or in combination, as essential to the invention.

Expectations

ORIGINAL BATHROOM

8 0 98U / 0 642

Claims (9)

Claims (in the German form) Process for the manufacture of incandescent lamps, in which a glass envelope, which is open at one end, is inserted through the open end Gas filling supplied and the open end is then closed, characterized in that inert Introduces gas directly into the glass envelope without prior evacuation. 2) Method according to claim 1, characterized in that that the inert gas is passed through the open end of the glass envelope, preferably to the opposite end the glass envelope feeds extending supply pipe. 3) Method according to claim 2, characterized in that that the inert gas is supplied over a period of time that is sufficient to fill the glass envelope, that the open end melted the glass still and withdrew the feed tube and while the feed tube is being withdrawn, the softened end of the glass envelope is compressed and the glass envelope is closed. 909814/06 4) Method according to claim 2 or J5, characterized in that that the supply of inert gas through the supply tube just before the withdrawal of the supply tube is interrupted from the glass envelope. 5) Method according to claim 1 to 4, characterized in that that the inert gas flows at a rate of approximately 0.028 nrVh (1 cubic foot per Hour). 6) Method according to claim 1 to 5, characterized in that that essentially atmospheric argon is used as the inert gas. 7) Method according to claim 1 to 6, characterized in that inert gas is allowed to flow into the glass envelope for about JQ seconds at a flow rate of about 0.028 nr / hour (l cubic feet per hour). 8) Method according to claim 1 to 7 * characterized in that that one or more electrical supply lines passed through the open end of the glass envelope and at Sealing the glass envelope to be sealed with. 9) Method according to claim 8, characterized in that that in order to seal the glass envelope filled with the inert gas, the walls of the open end of the glass envelope are heated until they soften and are pressed together or around the lead wire (s). 9098U / 0642