US2838297A - Oven for heating electric lamp envelopes - Google Patents

Oven for heating electric lamp envelopes Download PDF

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Publication number
US2838297A
US2838297A US625465A US62546556A US2838297A US 2838297 A US2838297 A US 2838297A US 625465 A US625465 A US 625465A US 62546556 A US62546556 A US 62546556A US 2838297 A US2838297 A US 2838297A
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US
United States
Prior art keywords
oven
lamp
envelopes
burner
electric 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
US625465A
Other languages
English (en)
Inventor
Stanley C Shappell
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.)
GTE Sylvania Inc
Original Assignee
Sylvania Electric Products Inc
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
Priority to CA576236A priority Critical patent/CA576236A/en
Priority to DENDAT1065936D priority patent/DE1065936B/de
Priority claimed from US543673A external-priority patent/US2789587A/en
Priority to GB31778/56A priority patent/GB806507A/en
Priority to FR1162741D priority patent/FR1162741A/fr
Application filed by Sylvania Electric Products Inc filed Critical Sylvania Electric Products Inc
Priority to US625465A priority patent/US2838297A/en
Priority to US629828A priority patent/US2927680A/en
Application granted granted Critical
Publication of US2838297A publication Critical patent/US2838297A/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
    • H01J9/38—Exhausting, degassing, filling, or cleaning vessels
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B29/00—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins
    • C03B29/04—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins in a continuous way
    • C03B29/06—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins in a continuous way with horizontal displacement of the products

Definitions

  • the lamp envelope is usually heated one or more times during the manufacturing operations.
  • the lamp envelope is usually heated to a temperature sufiicient to decompose the binder employed in the application of a suspension of luminescent material to the inner wall of the lamp envelope.
  • the lamp envelope is connected to an exhaust system to effect evacuation of impurities therefrom, Since exhausting ofthe lamp envelope can be performed more satisfactorily and more efiiciently if the lamp envelope is hot, heat is usually applied to the lamp envelope during the exhausting operation or, as taught in my copending application, Serial No. 543,673, filed October 31, 1955, now Patent No. 2,789,587, immediately before the start of this operation. 7
  • an object of this invention is to heat lamp tubes efiiciently and economically.
  • Another object is to provide an oven for heating lamp tubes of various lengths efficiently and economically.
  • a plurality of burner pipes extending substantially parallel to the longitudinal axis of the oven and transverse to the path through which the lamp tubes are caused to pass as they are moved through the oven.
  • Each burner pipe is provided with a plurality of ports and each burner pipe is provided with its own controls.
  • the number of burners which are fired is determined by the length of the lamp tubes to be heated.
  • This arrangement insures eflicient operation of the oven because, when relatively short lamp tubes are to be heated, only those burners lying in the path to be traversed by the lamp tubes have to be ignited. Similarly, when relatively longer lamp tubes are to be heated, such additional burners as necessary may be ignited.
  • the burner pipes are preferably substantially rectangular in cross-section and disposed beneath ice the work in order to insure a high degree of uniformity of heating.
  • Figure. 1 is a side elevational view, partly in section, of the oven; and Figure 2 is a plan view of the oven of Figure 1 with the roof thereof removed.
  • the oven frame which is fabricated primarily from angle iron and channel iron stock, comprises a channel iron base 12 attached toangle iron legs 14 intermediate their ends.
  • Angle iron side supports 16 are mounted on the upper ends oflegs 14.
  • Bearing housings 18 and 20, mounted on side supports 16, support the oven conveyor drive shaft 22.
  • Bearing housings 24 and 26, mounted on side supports 16, support the oven conveyor idler shaft 28.
  • Idler shaft 28 is provided with a plurality of sprockets 30, and drive shaft 22 is provided with a plurality of sprockets 32.
  • the several sprockets 30 are connected to the several sprockets 32 by chains 34, and the upper reaches of which ride on chain tracks 35 mounted on brackets 37.
  • Each of the chains 34 is provided with a plurality of fingers 36' attached thereto and upstanding thereon.
  • the oven conveyor drive shaft 22 is driven by some suitable means, such as the drive shaft of an associated machine for example, through chain 40, sprocket 42 .on shaft 44, sprocket 46 on shaft 44, and chain 48 which connects sprocket 46 to a sprocket 50 on the oven conveyor drive rality of burner ports 55.
  • the burner pipes 54 are attached at two points intermediate their ends to support plates 56 mounted on top of posts 58 upstanding on channel iron bars 60 which are mounted on base members 62 attached to side supports 16.
  • burner sup- 7 port plates 56 lie in substantially the same horizontal plane as the upper reaches of the chains 34, separate plates 56 are used between the upper reaches of the chains 34 in order to provide a free path therefor. Further support of the burner pipes 54 is effected by anchors 64 which connect each of the burner pipes 54 to a tube 66 mounted in brackets 68 attached to side supports 16.
  • the roof 70 of the oven which comprises a plurality of sheets of stainless steel, is supported from the channel iron base 12 by channel iron legs 72 and channel iron cross bars 74.
  • Lamp tubes may be fed to the oven manually or by a suitable feeding mechanism.
  • a lamp tube is disposed initially in the position occupied by lamp tube 1a on the right side of Figure 1, i. e., resting on discs 76 mounted on idler shaft 28 and supported by fingers 36a on chains 34.
  • the rods 78 are mounted on brackets 80 which are attached to channel iron bars 60. Due to the inclination of the rods 78, the lamp tube 1a rolls away from fingers 36a and into engagement with the fingers immediately forward thereof, assuming the position occupied by lamp tube 1b (Fig. 1) in engagement with fingers 361').
  • plates 82 (Fig. 2) are mounted on the burner pipes 54 to guide the fingers 36 into the spaces between the burner pipes.
  • the oven is designed particularly for use in conjunction with an exhaust machine of the type shown in my co-pending application, Serial No. 543,673, filed October 31, 1955, i. e., an exhaust machine in which the heads to which one end of the lamp tubes are connected are adjustable longitudinally with respect to the heads to which the other end of the lamp tubes are connected in order to accommodate lamp tubes of different lengths.
  • the burner pipes 54 are disposed in a plane substantially perpendicular to. the plane in which the longitudinal axis of the lamp tube is disposed as it moves through the oven. Since each burner pipe 54 is provided with its own tubing 86 connecting it to the manifold, individual valves 87 are provided to permit regulation of the flow of gas to each burner pipe 54.
  • This arrangement insures eflicient operation of the oven because, when relatively short lamp tubes are to be heated, only those burners lying in the path to be traversed by the lamp tubes have to be ignited. Similarly, when relatively longer lamp tubes are to be heated, such additional burners as necessary may be ignited.
  • An oven for heating elongated tubular electric lamp envelopes comprising: an insulated enclosure having an opening at each end thereof defining an entrance and an exit; a conveyor, inclined from said entrance to said exit, for carrying elongated tubular electric lamp envelopes through said insulated enclosure from said entrance to said exit, with the longitudinal axes of said envelopes transverse to the longitudinal axis of said enclosure; and heating means disposed beneath the path traversed by said lamp envelopes moving through said enclosure and substantially parallel to the longitudinal axis of said enclosure.
  • An oven for heating elongated tubular electric lamp envelopes comprising: an insulated enclosure having an opening at each end thereof defining an entrance and an exit; a conveyor, inclined from said entrance to said exit, for carrying elongated tubular electric lamp envelopes through said insulated enclosure from said entrance to said exit, with the longitudinal axes of said envelopes transverse to the longitudinal axis of said enclosure; heating means disposed beneath the path traversed by said lamp envelopes moving through said enclosure and sub stantially parallel to the longitudinal axis of said enclosure, said heating means comprising a plurality of closely spaced burner pipes, each having a plurality of burner ports therein; and independent means for controlling the flow of a combustible gaseous mixture to each of said burner pipes.
  • An oven for heating elongated tubular electric lamp envelopes comprising: an insulated enclosure having an opening at each end thereof defining an entrance and an exit; a conveyor, inclined from said entrance to said exit, for carrying elongated tubular electric lamp envelopes through said insulated enclosure from said entrance to said exit, with the longitudinal axes of said envelopes transverse to the longitudinal axis of said enclosure; heating means disposed beneath the path traversed by said lamp envelopes moving through said enclosure and substantially parallel to the longitudinal axis of said enclosure, said heating means comprising a plurality of closely spaced burner pipes substantially rectangular in cross-section, each having a plurality of burner ports therein; and independent means for controlling the flow of a combustible gaseous mixture to each of said burner pipes.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Specific Conveyance Elements (AREA)
  • Baking, Grill, Roasting (AREA)
US625465A 1955-10-31 1956-11-30 Oven for heating electric lamp envelopes Expired - Lifetime US2838297A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CA576236A CA576236A (en) 1955-10-31 Lamp exhaust machine
DENDAT1065936D DE1065936B (US20100223739A1-20100909-C00025.png) 1955-10-31
GB31778/56A GB806507A (en) 1955-10-31 1956-10-18 Improvements in exhaust machines for electric discharge devices
FR1162741D FR1162741A (fr) 1955-10-31 1956-10-31 Machine à faire le vide dans des dispositifs à décharge électrique
US625465A US2838297A (en) 1955-10-31 1956-11-30 Oven for heating electric lamp envelopes
US629828A US2927680A (en) 1955-10-31 1956-12-21 Conveyor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US543673A US2789587A (en) 1955-10-31 1955-10-31 Exhaust machine
US625465A US2838297A (en) 1955-10-31 1956-11-30 Oven for heating electric lamp envelopes

Publications (1)

Publication Number Publication Date
US2838297A true US2838297A (en) 1958-06-10

Family

ID=27067400

Family Applications (1)

Application Number Title Priority Date Filing Date
US625465A Expired - Lifetime US2838297A (en) 1955-10-31 1956-11-30 Oven for heating electric lamp envelopes

Country Status (5)

Country Link
US (1) US2838297A (US20100223739A1-20100909-C00025.png)
CA (1) CA576236A (US20100223739A1-20100909-C00025.png)
DE (1) DE1065936B (US20100223739A1-20100909-C00025.png)
FR (1) FR1162741A (US20100223739A1-20100909-C00025.png)
GB (1) GB806507A (US20100223739A1-20100909-C00025.png)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4264301A (en) * 1978-05-26 1981-04-28 The Hepworth Iron Company Limited Method and apparatus for firing ceramic products
US4382051A (en) * 1978-05-26 1983-05-03 The Hepworth Iron Company Limited Of Sheffield Method for firing ceramic products

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1903878A (en) * 1931-10-20 1933-04-18 Frank T Powers Heater
US2139067A (en) * 1937-02-11 1938-12-06 Nat Tube Co Continuous heating furnace
US2391970A (en) * 1943-12-07 1946-01-01 Nat Lock Washer Co Continuous furnace
US2530778A (en) * 1947-08-28 1950-11-21 Edward H Otto Bake oven for baking various food products
US2698170A (en) * 1951-02-09 1954-12-28 Charles H Foley Hay curing machine
US2795411A (en) * 1953-03-27 1957-06-11 Int Harvester Co Portable gas heat treating machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1903878A (en) * 1931-10-20 1933-04-18 Frank T Powers Heater
US2139067A (en) * 1937-02-11 1938-12-06 Nat Tube Co Continuous heating furnace
US2391970A (en) * 1943-12-07 1946-01-01 Nat Lock Washer Co Continuous furnace
US2530778A (en) * 1947-08-28 1950-11-21 Edward H Otto Bake oven for baking various food products
US2698170A (en) * 1951-02-09 1954-12-28 Charles H Foley Hay curing machine
US2795411A (en) * 1953-03-27 1957-06-11 Int Harvester Co Portable gas heat treating machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4264301A (en) * 1978-05-26 1981-04-28 The Hepworth Iron Company Limited Method and apparatus for firing ceramic products
US4382051A (en) * 1978-05-26 1983-05-03 The Hepworth Iron Company Limited Of Sheffield Method for firing ceramic products

Also Published As

Publication number Publication date
CA576236A (en) 1959-05-19
DE1065936B (US20100223739A1-20100909-C00025.png)
GB806507A (en) 1958-12-23
FR1162741A (fr) 1958-09-16

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