US2153404A - Method of making stems for sealed electrical devices - Google Patents

Method of making stems for sealed electrical devices Download PDF

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Publication number
US2153404A
US2153404A US721270A US72127034A US2153404A US 2153404 A US2153404 A US 2153404A US 721270 A US721270 A US 721270A US 72127034 A US72127034 A US 72127034A US 2153404 A US2153404 A US 2153404A
Authority
US
United States
Prior art keywords
stem
tube
wires
exhaust
leading
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
US721270A
Other languages
English (en)
Inventor
Arthur J White
Percy J Johnson
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Priority to US721270A priority Critical patent/US2153404A/en
Priority to DEA75820D priority patent/DE732225C/de
Priority to GB11758/35A priority patent/GB439927A/en
Priority to FR788922D priority patent/FR788922A/fr
Application granted granted Critical
Publication of US2153404A publication Critical patent/US2153404A/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
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/32—Sealing leading-in conductors

Definitions

  • Our invention relates to so-called tipless radio tubes, incandescent lamps and similar devices and to methods of manufacturing the same.
  • the present practice in making the stems 5 which carry the exhaust tube and the leadingin wires upon which the internal elements of the radio tubes or incandescent lamps are mounted, is to assemble a stem tube, anexhaust tube and the leading-in wires with the inner ends of 10. the stem and exhaust tubes substantially in line.
  • inner end is used herein with reference to the stem to indicate that end of the said tube which extends into the bulb and in which the leading-in wires are sealed, while the expression outer end indicates the end which is united to the bulb.
  • outer end indicates the end which is united to the bulb.
  • the corresponding ends of the exhaust tube are similarly designated.
  • the exhaust tube is closed at its inner end and it is preterable to blow a small bulb at this end, although this is not essential. 'l'he parts are then assembled with the bulbous end of the exhaust tube subv stantial'ly in line with the inner end of the stem tube and the leading-in wires dis'posed'in spaced.
  • leading-in wires may be arranged in any desired relationship, for example, in a circle, square, oblong or triangle.
  • the application of a flame results in a fusing together of the inner ends of the stem and exhaust tubes and the introduction of air pressure into the outer end of the exhaust tube prevents the walls of the tubes from collapsing and fusing solidly, thus forming a chamber or bulb portion having the leading-in wires sealed in the walls thereof without the application of external pressure.
  • a passage or aperture is formed for communication of the exhaust tube with the interior of the bulb when the stem is sealed thereto.
  • the said passage may be formed at the side or at the end of the stem, depending upon which is the hotter, and this of course may be controlled.
  • leading-in wires for a given diameter of stem tube; the use of a smaller stem tube, which permits the use of a smaller bulb or enclosure; and the arrangement of any number of leads as required.
  • An annular or circular arrangement of leading-in wires is particularly suitable for radio tubes, inakingpossible the use of a large number oi wires, suitably spaced apart and providing a compact and rigid supporting structure for the internal elements of the said tubes.
  • the invention is of course also applicable to incandescent lamps, particularly to multiple filament lamps which employ a number of lead wires.
  • Fig. 1 is an elevation in section showing the way in which the parts of the stem are preliminarily assembled according to our invention
  • Fig. 2 is a similar view showingthe stem tube and exhaust tube fused together, both views corresponding to a section through 2-2 of Fig.4
  • Fig. 3 is an elevation in section of a finished stem having a transverse aperture or passage through which the exhaust tube communicates with the interior of the bulb, the section being taken at 3-3 ofFig. 4
  • Fig. 4 is a plan view of the stem shown in Figs. l3
  • Fig. 5 is I an elevation in section showing a method of makof an incandescentfiamp having a stem compris-v view of a radio tube having a stem comprising our invention
  • Fig. 9 is a perspective view ing our invention.
  • the application of a flame or flames l1 results in a fusing together of the end of the stem tube i4 and the bulb IQ.
  • the wall of the bulbous portion l6 and the wall of the inner end of the stem tube I4 are sealed around their entire peripheries to enclose portions of the leading-in wires Hi therebetween.
  • Air pressure is then, introduced into the exhaust tube l5 from a nozzle II to prevent and-an exhaust passage 33 with the interim;
  • the ends of the stem and exhaust tubes merging instead to form a chamber or bulb-shaped portion ll having portions of the leading-in wires i sealed in the walls bulb when the stem is sealed thereto.
  • Air pressure is then introduced between the stem tube It and exhaust tube It from a nozzle I 8' to round out the joint at 20' between said stem and exhaust tubes to prevent cracking.
  • the said aperture is may be formed at the side or at the end of the stem depending upon which is the hotter,
  • Fig. 4 shows the annular distribution of six leading-in wires i0 as made according to Figs. 1-3.
  • the number and arrangement of lead wires may of course be varied as required. They may be disposed, for example, or triangle.
  • a radio tube having a stem ll of the type shown in Figs. 3-4 is illustrated inj'ig. 8, the exhaust passage being illustrated at 24.
  • a flare 25 at the outer end of the stem is sealed to the end of the bulb 28 which is evacuated through the exhaust tube l which is then sealed-01f at 21.
  • the internal elements 28 characteristic of this type of device are mounted on the support and leading-in wires ill, the annular arrangement of the wires as'shown making possible a very rigid and compact assembly of the said internal elements.
  • the use of a comparatively small bulb is made possible by the annular disposition of the leading-in and supporting wires instead of a linear disposition in which the leads pass through a flat stem press. In order to get the proper spacing between the leads with the flat stem press used heretofore, the
  • the particular lamp illustrated employs three leading-in wires 34, 35, 36, which are .triangularly disposed and portions of which are sealed in the walls of the correspondingly substantially triangular shaped chamber 32' at the inner end of the stem 29.
  • a filament 31 is mounted on the leading-in wires 34, 35, and a second'fllament 38 is mounted on the leading-in wire 36 and on a branch lead 39 which is mounted on the common lead 35.
  • stems for sealed electrical devices which consists in assembling a stem tube, an exhaust tube inside of said stem tube and closed at one end and leading-in wires extending longitudinally between said tubes, fusing together portions of the walls of said stem tube and exhaust tube around their entire'peripheries to enclose portions of said leading-in wires therein, the entire fused portions of said stem and exhaust tubes forming the side walls of a chamber and the closed end of the exhaust tube forming the end wall of said chamber, and delivering air pressure into said exhaust tube to prevent the.
  • stems for sealed electrical devices which consists in assembling a stem tube. an exhaust tube inside of said stem tube and having a bulb portion at one end and leading-in wires extending longitudinally between said stem tube and the bulb portion of said exhaust tube,- fusing together portions of theWalls of said stem tube and bulb portion of said exhaust tube around their entireperipheries to and theclosed endof the exhaust tube formingthe end wall of'said chamber, and delivering air pressure into said exhaust tube to prevent the said and results in the stem walls of the chamber from collapsing to I .J blow-an aperture through the wall of said chamber.
  • the method 01' making stems for sealed electrical devices which consists in assembling a stem tube, an exhaust tube inside of said stem tube and closed at one end and leading-in wires extending longitudinally between said tubes, applying heat to portions of the walls of said tubes to fuse together said portions of the walls oi said stem tube and exhaust tube around their entire peripheries to enclose portions of said leading-in wires therein, the entire fused portions oi said stem and exhaust tubes forming the side walls of a chamber and the closed end of the exhaust tube forming the end. wall of said chamber, and
  • said leading-in wires being supported in spaced relationship in openings in a block andcsaid stem and exhaust tubes being disposed with their inner ends on said block, fusing together portions of the walls of said stem tube,
  • stems for sealed electrical devices which consists in assembling a. stem tube, an exhaust tube inside or said stem tube and closed at one end, the closed end of said exhaust tube being located adjacent to one end of said stem tube, and leading-in wires extending longitudinally between said tubes and held rigidly in s walls of thesaid adjacent end portions of said stem tube and exhaust tube around their entireperipheries to enclose portions oi said leading-in wires therebetween, the entire fused portions of ced reiationshimiusing together-the said stem and exhaust tubes forming the side walls of a chamber and the closed end of the ex-'

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
US721270A 1934-04-19 1934-04-19 Method of making stems for sealed electrical devices Expired - Lifetime US2153404A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US721270A US2153404A (en) 1934-04-19 1934-04-19 Method of making stems for sealed electrical devices
DEA75820D DE732225C (de) 1934-04-19 1935-04-16 Verfahren zum vakuumdichten Einschmelzen von Stromzufuehrungen von elektrischen Vakuumgefaessen
GB11758/35A GB439927A (en) 1934-04-19 1935-04-16 Improvements in or relating to methods of sealing conductors into glass envelopes for radio tubes, incandescent lamps and the like
FR788922D FR788922A (fr) 1934-04-19 1935-04-17 Perfectionnements à la fabrication des lampes électriques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US721270A US2153404A (en) 1934-04-19 1934-04-19 Method of making stems for sealed electrical devices

Publications (1)

Publication Number Publication Date
US2153404A true US2153404A (en) 1939-04-04

Family

ID=24897264

Family Applications (1)

Application Number Title Priority Date Filing Date
US721270A Expired - Lifetime US2153404A (en) 1934-04-19 1934-04-19 Method of making stems for sealed electrical devices

Country Status (4)

Country Link
US (1) US2153404A (fr)
DE (1) DE732225C (fr)
FR (1) FR788922A (fr)
GB (1) GB439927A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2428059A (en) * 1943-02-24 1947-09-30 Int Standard Electric Corp Sealing of wires into glass
US2465732A (en) * 1942-03-14 1949-03-29 Hartford Nat Bank & Trust Co Electric discharge tube

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2465732A (en) * 1942-03-14 1949-03-29 Hartford Nat Bank & Trust Co Electric discharge tube
US2428059A (en) * 1943-02-24 1947-09-30 Int Standard Electric Corp Sealing of wires into glass

Also Published As

Publication number Publication date
FR788922A (fr) 1935-10-19
DE732225C (de) 1943-03-11
GB439927A (en) 1935-12-17

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