US2014471A - Process of sealing-off vessels containing gas - Google Patents

Process of sealing-off vessels containing gas Download PDF

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Publication number
US2014471A
US2014471A US684365A US68436533A US2014471A US 2014471 A US2014471 A US 2014471A US 684365 A US684365 A US 684365A US 68436533 A US68436533 A US 68436533A US 2014471 A US2014471 A US 2014471A
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US
United States
Prior art keywords
tube
gas
bulb
sealing
pressure
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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
US684365A
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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
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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 US2014471A publication Critical patent/US2014471A/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

  • glass or the like which can be softened or fused by heating, although the bulb itself may and usu' ally does also consist of a vitreous substance, such as for example glass.
  • gas in the following specification and claims is meant to in- I elude any substance which can be present in the gaseous phase at room temperature.
  • the process according to my invention is intended to be used and is of special importance in cases in which the pressure of the gas in the bulb no of the lamp, during the process of sealing-off is greater than the pressure of the external atmosphere, that is to say, when the lamp bulb which is being sealed off, is under an internal pressure exceeding 760 mm. mercury.
  • the present process can be carried out in a simple manner, with but little departure from the process used heretofore for similar purposes.
  • Fig. 2 is a plan view of an arrangement suitable for carrying out the present process
  • Fig. 3 shows the same arrangement in side elevation and partly in section
  • Figs. 4 and 5 show different stages in the progress of the process, Fig. 4 being an elevation and Fig. 5 a plan view;
  • Figs. 6 and 7 show, in front and in side elevation, respectively, the sealed-oil pump tube of the lamp
  • Figs. 8 and 9 show the same tube after separa tion
  • Figs. 10 and 11 show two constructional forms of pinching or tube closing tools used for pinching off the tube;
  • Figs. 12 and 13 are two views of the pump tube showing the same pinched together but not yet severed or separated;
  • Fig. 16 shows a pump tube which has been severed below the level of the sealing-off pinch previously produced.
  • FIG. 1 of the drawing shows the glass bulb l of the lamp provided with the socket 2 and the fill- 1o ing tube 3, also made of glass, connected with the bulb in the usual manner by being fused to the inside of the socket 2 and thereafter blown out.
  • the glass tube ii is connected on its lower part 3' by means of the connecting-piece 1, made of rub- 15.
  • the tube 3 is heated, in a manner wellknown to those skilled in the art, on its part 5 by gas-flames from 20 the burners E to a temperature above the softening temperature of its material.
  • the bulb l 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 thatthey are pressed and fused together and thus airtightly seal the lamp, thereby effecting the first step of the known process, the airtight sealing.
  • the tube under the influence of the surface tension of the softened 30 glass, is being parted in two, thereby completing the second step of the known process, the separation.
  • My invention is based upon the-discovery that lamp bulbs, which during the process of sealing off are under an internal gas pressure greater than that of atmosphere can, in fact, be sealed oil in a similar manner provided that the actual closure of the pump tube, that is, the step which constitutes the first phase of the sealing-off operation, is not left for the surface tension of the softened glass or for the pressure of the external air to accomplish, but is carried out by compressing the pump tube, previously softened to an appropriate degree of plasticity, by means of a suitable tool, or several such tools.
  • the heating of the glass tube be suitably carried out, a state is arrived at or a moment can be found in which the glass is not yet so soft that the superatmospheric pressure inside the tube will blow it out during the short period required for the closing operation but is alreadysuiliciently plastic to permit of its being compressed without being broken or cracked and the tube closed by means of the suitable tool or tools just mentioned.
  • the numeral 3 designates the pump tube, the lower part in fits and is connected to, the bore of the connecting-piece 4.
  • the members I and l together constitute the pinching tool, which consists of two parts and may be heated in any suitable way, for example by the flames of the same gas burners 8, or of other gas burners, not shown, or electrically.
  • This tool when its parts are moved, respectively, in the directions indicated by the arrows 8 and 8' of Figs. 2, 4 and 5 squeezes the sides of the previously heated and sufllciently softened pump tube together.
  • Tools of other shapes may also be used.
  • tools l1, I! or 19 and I! having the sections shown in Figs. 10 and 11 have been found to be quite satisfactory.
  • the tools preferably consist of suitable steel, which does not adhere to the hot glass, such steels being known in the art.
  • the tool may also be so constructed that it compresses the tube in more than two directions.
  • example of one mode of carrying out the process according to my invention is one in which the sealing-oil of the pump tube and its severance are carried out in a single oper-
  • the actual separation may then, of course, be 5 effected, when the tube is cold, by snapping off the free end at the pinch 3b.
  • Figs. 14 and 15 show the appearance of the end of a pump tube snapped. oif in this way. In this case also the end of the tube may subsequently be heated to round it off.
  • the severing step may, of course, be omitted altogether, o'r severance may be effected below the point where the tube is pinched, as shown in Fig. 16. In this case, again, the end of thetube may be rounded off or fused by re-heating it. 15
  • the invention includes gas filled electric incandescent lamps, having an internal gas pressure exceeding the pressure of a 600 mm. mercury column and the characteristic features of a pump 30 tube compressed by means of a tool, i. e. partly flattened by said tool It is also characteristic of lamp bulbs, sealed by the process according to my invention, that the part where the pump tube is sealed off is flat- 35 tened on two or more sides and that there is a sharp edge II which is not rounded oil by the surface tension of the glass, inside the said pump tube, as shown on Figs. 7, 8, 9 and 12 to 16 inclusive. In most cases this edge terminates in the two sharp and well-defined corners not points 12 and 12, as shown in Figs. 7, 12 and 15, these not being rounded off by the surface tension of the glass.
  • the process for sealing-off the bulb by air-tightly closing said tube which, in a combined group of steps, consists in heating said tube until it is plastic enough. to be compressed and be proof against fracture and breakage, and thereafter, while said heated tube is yet-sufliciently resistant to withstand being blownout by theinterior gas pressure, compressing and thereby closing the plastic tube by 65 means of a tool.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
US684365A 1932-06-17 1933-08-09 Process of sealing-off vessels containing gas Expired - Lifetime US2014471A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2014471X 1932-06-17
AT406185X 1932-06-30

Publications (1)

Publication Number Publication Date
US2014471A true US2014471A (en) 1935-09-17

Family

ID=32470985

Family Applications (1)

Application Number Title Priority Date Filing Date
US684365A Expired - Lifetime US2014471A (en) 1932-06-17 1933-08-09 Process of sealing-off vessels containing gas

Country Status (6)

Country Link
US (1) US2014471A (enrdf_load_stackoverflow)
BE (1) BE397090A (enrdf_load_stackoverflow)
DE (1) DE628223C (enrdf_load_stackoverflow)
FR (1) FR757649A (enrdf_load_stackoverflow)
GB (1) GB406185A (enrdf_load_stackoverflow)
NL (1) NL41253C (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2449478A (en) * 1945-02-14 1948-09-14 Herzog Carl Method of sealing one end of open ended tube, filling through remaining open end, and sealing remaining open end
US2494915A (en) * 1942-04-16 1950-01-17 Gen Electric Method of gas-filling and sealing vessels
US2666545A (en) * 1949-05-20 1954-01-19 John J Hopfield Container having a distortable flow control means
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
US2934860A (en) * 1955-03-01 1960-05-03 Rca Corp Tip-off apparatus for electron tubes
US2983078A (en) * 1957-07-12 1961-05-09 Westinghouse Electric Corp Method of sealing a vitreous conduit
US3140165A (en) * 1960-03-02 1964-07-07 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Apparatus for tipping off the exhaust apertures of envelopes filled with gas at a presure higher than atmospheric
CN103730309A (zh) * 2013-12-31 2014-04-16 詹云翔 一种灯泡封口机
CN111251001A (zh) * 2020-03-02 2020-06-09 常州碳元热导科技有限公司 超薄热管的切割封合方法及其装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL248352A (enrdf_load_stackoverflow) * 1959-02-18

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2494915A (en) * 1942-04-16 1950-01-17 Gen Electric Method of gas-filling and sealing vessels
US2449478A (en) * 1945-02-14 1948-09-14 Herzog Carl Method of sealing one end of open ended tube, filling through remaining open end, and sealing remaining open end
US2666545A (en) * 1949-05-20 1954-01-19 John J Hopfield Container having a distortable flow control means
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
US2934860A (en) * 1955-03-01 1960-05-03 Rca Corp Tip-off apparatus for electron tubes
US2983078A (en) * 1957-07-12 1961-05-09 Westinghouse Electric Corp Method of sealing a vitreous conduit
US3140165A (en) * 1960-03-02 1964-07-07 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Apparatus for tipping off the exhaust apertures of envelopes filled with gas at a presure higher than atmospheric
CN103730309A (zh) * 2013-12-31 2014-04-16 詹云翔 一种灯泡封口机
CN103730309B (zh) * 2013-12-31 2016-08-17 詹云翔 一种灯泡封口机
CN111251001A (zh) * 2020-03-02 2020-06-09 常州碳元热导科技有限公司 超薄热管的切割封合方法及其装置
CN111251001B (zh) * 2020-03-02 2025-02-11 常州碳元热导科技有限公司 超薄热管的切割封合方法及其装置

Also Published As

Publication number Publication date
NL41253C (enrdf_load_stackoverflow)
BE397090A (enrdf_load_stackoverflow)
GB406185A (en) 1934-02-22
DE628223C (de) 1936-03-31
FR757649A (fr) 1933-12-29

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