US1977671A - Process of sealing of gas-filled containers - Google Patents

Process of sealing of gas-filled containers Download PDF

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Publication number
US1977671A
US1977671A US683566A US68356633A US1977671A US 1977671 A US1977671 A US 1977671A US 683566 A US683566 A US 683566A US 68356633 A US68356633 A US 68356633A US 1977671 A US1977671 A US 1977671A
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US
United States
Prior art keywords
tube
sheath
sealing
gas
lamp
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US683566A
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English (en)
Inventor
Neumann Mihaly De
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Egyesuelt Izzolampa es Villamossagi Rt
Original Assignee
Egyesuelt Izzolampa es Villamossagi Rt
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Egyesuelt Izzolampa es Villamossagi Rt filed Critical Egyesuelt Izzolampa es Villamossagi Rt
Application granted granted Critical
Publication of US1977671A publication Critical patent/US1977671A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/40—Closing vessels

Definitions

  • My invention relates to improvements in or relating to the process of. the airtight or gas-.
  • the bulbs of which consist of a hollow body or envelope provided with at least one evacuating tube connected to or integral with the bulb, for pumping air or gas out of the bulb, or filling the same with gas, this tube at least being made of such a material, as for example glass, quartz glass, or the like, which shall in the following specification and claims be briefly termed glass-like material, which can be softened or melted by heating, although the body of the bulb may also consist of such glass-like material.
  • the process according to my invention is of special importance in such cases, when the gas contained in the bulb ofthe lamp has, during the process of sealing, a pressure exceeding the atmospheric pressure, 1. e. the bulb is, during its sealing, subjected to inner pressure exceeding 760 mm. mercury.
  • the present process can be carried out, even in such cases, without undue difficulties'and without employing complicated apparatus.
  • the process of my invention relates particularly to gas-filled electric incandescent lamps, and will be fully explained hereinafter, by way of example in connection with the sealing of such lamps, with due reference to the accompanying drawing, in which Fig. 1 shows the method used heretofore'for the sealing of such lamps, Fig.'
  • the glass tube 3 is connected, by means of the connecting-piece 4, made of rubber, with the tube 16, leading to the exhausting-pump or the supply of filling gas, not shown.
  • the tube 3 is heated, in any manner well-known to those skilled in s the art, on its part 5 by gas-flames from the burners 6 and 6' to a temperature above the softening temperature of its material.
  • the bulb 1 being filled with gas at a pressure below the atmospheric pressure, the external pressure of the air readily deforms the softened walls of the tube 3, so that they are pressed and fused together and thus airtightly seal the lamp, thereby effecting the first step of the known process, or the airtight sealing.
  • the same is parted in two, thereby completing the second step of the known process, the separation.
  • 1 surround the part of the tube which is to be sealed with such a sheath, which is able to bear the inner pressure of the gas filling the bulb, at the temperature necessary for the sealing without materially or disadvantageously altering its shape at the same temperature in consequence of the inner pressure transmitted to it by the softened tube walls, and the heat acting on it at the same time, but readily allows the deformation of the tube necessary for its sealing.
  • a sheath must therefore 8 consist of a material, the softening and prefer- 1 ably melting temperature of which lies above the softening and melting temperature of the material of the tube to be sealed.
  • the aforementioned sheath may be a hollow, cylindrical body for example, such as a metal 105 tube with thin 'walls, which outwardly fits and is thrust onto the tube to be sealed, and consisting of a suitable metal such as brass.
  • This sheath can also be made on the tube itself by winding on its thin metal foil, or a metallic tissue no such as wire gauze, or metal wire of suitable material and strength, in a suitablenumber of turns or layers.
  • Mica foil or glass texture or glass thread made of a glass of higher softening and melting temperature than that of the tube to be sealed, and other materials and shapes, such as bands, may also be used.
  • sheaths made of poorer heat-conducting material than brass, for example of iron may also be protected in other ways, for example by cooling or shielding them in any suitable manner'.
  • the tube 3 to be sealed is provided, according to my invention, with the sheath 7 of Fig. 2, the lamp then being connected to the pump, pumped out and filled with gas in the usual manner, at any suitable pressure above the atmospheric pressure. Thereafter, the middle part 10 of the tube 3 contained in the sheath 7 is heated by heating the sheath with the gas flames of the gas burners 6 and 6' of Fig. 3 and above and below the point of heating, on the points 11 and 12, the sheath is cooled by streams of air blown on it from the compressed-air nozzles 8, 8' and 9, 9.
  • a suitable screen may be placed between the point of heating and the lamp socket to protect the latter.
  • This screen may be hollow, and be cooled by any suitable cooling medium, such as water or air, streaming through it.
  • the tube is pinched together in order to close or seal it and to separate its lower part from the lamp.
  • the tools marked 14 and 14' on the Figs. 4 to 6 these tools preferably consisting of suitable steel, and being pressed together in order to seal and to cut the tube 3.
  • the sealing of the tube can also be accomplished according to my invention without deforming and/or cutting the sheath.
  • the present process may be carried out in such a way, that the tube, after having been softened by heating, is closed and sealed by subjecting it to deformation by compression, torsionor both.
  • the tube 3 after having been softened by heating it through the sheath 7 with the gas flames of the burners 6 and 6', is closed by compressing its heated middle part. This is accomplished by subjecting the socket 2, the lower part 3' of the tube, or both to a movement in the direction indicated by the arrows 13 and 13'.
  • the tube may be subjected to torsion by turning the socket 2, the lower part of the tube 3 or both, in latter case in opposite directions, around the axis of the tube 3.
  • the separation of the lower part 3 of the tube may in this case be effected in any suitable way, for example by again heating the tube and cutting it off together with the shell, by breaking it off in a manner known in itself for cutting glass tubes or rods, when cold, etc.
  • the heating of the tubeon the point of its sealing may also be effected electrically, for example by using a sheath surrounding the tube in a looplike fashion, and heating this metallic sheath with an electrical current, or by using any other kind of sheath and heating with a separate electrical heating element or device.
  • the electric incandescent lamps, sealed by the process according to my invention have a tube, the end of which is either fiat, when shorn oil. or bears an edge, when pinched off, or has spiral surface lines or ridges when twisted off, or has the characteristic shining crystalline surface of glass broken cold, and is, furthermore, usually surrounded with the sheath.
  • gas-filled electric of gas-like material consists in applying to the tube a metallic sheath MIHALY 1m NEUMANN.
  • said sheath with an electrical cur-.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Resistance Heating (AREA)
  • Radiation-Therapy Devices (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
US683566A 1932-07-30 1933-08-04 Process of sealing of gas-filled containers Expired - Lifetime US1977671A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
HU404566X 1932-07-30

Publications (1)

Publication Number Publication Date
US1977671A true US1977671A (en) 1934-10-23

Family

ID=10979089

Family Applications (1)

Application Number Title Priority Date Filing Date
US683566A Expired - Lifetime US1977671A (en) 1932-07-30 1933-08-04 Process of sealing of gas-filled containers

Country Status (6)

Country Link
US (1) US1977671A (enrdf_load_stackoverflow)
BE (1) BE397940A (enrdf_load_stackoverflow)
DE (1) DE628224C (enrdf_load_stackoverflow)
FR (1) FR758895A (enrdf_load_stackoverflow)
GB (1) GB404566A (enrdf_load_stackoverflow)
NL (1) NL39555C (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2714785A (en) * 1950-11-21 1955-08-09 Hartford Nat Bank & Trust Co Method of sealing a vacuum vessel having a thick-walled exhaust tube
US3144320A (en) * 1959-04-07 1964-08-11 Patent Treuband Ges Fur Elek S Method for the heating of articles made of glass

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE450308A (enrdf_load_stackoverflow) * 1942-04-16

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2714785A (en) * 1950-11-21 1955-08-09 Hartford Nat Bank & Trust Co Method of sealing a vacuum vessel having a thick-walled exhaust tube
US3144320A (en) * 1959-04-07 1964-08-11 Patent Treuband Ges Fur Elek S Method for the heating of articles made of glass

Also Published As

Publication number Publication date
FR758895A (fr) 1934-01-24
NL39555C (enrdf_load_stackoverflow)
GB404566A (en) 1934-01-18
DE628224C (de) 1936-04-01
BE397940A (enrdf_load_stackoverflow)

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