US3021878A - Exhaust machine for lamp and radio bulbs and the like - Google Patents

Exhaust machine for lamp and radio bulbs and the like Download PDF

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Publication number
US3021878A
US3021878A US684009A US68400957A US3021878A US 3021878 A US3021878 A US 3021878A US 684009 A US684009 A US 684009A US 68400957 A US68400957 A US 68400957A US 3021878 A US3021878 A US 3021878A
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United States
Prior art keywords
vacuum
pump
turret
bulbs
chamber
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Expired - Lifetime
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US684009A
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English (en)
Inventor
Herrmann Oskar
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.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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    • 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
    • H01J9/385—Exhausting vessels
    • 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

Definitions

  • Oil-air pumps for producing so-called high vacuum are used in most cases for effecting the evacuation of the bulbs during part of the cycle of travel in the machine and in many instances what is known as a backer or fore-pump is used at an early part of the cycle for obtaining a preliminary or partial evacuation of each bulb before that bulb reaches a station at which the high-vacuum pump is effective thereon.
  • Exhaust machines of the character indicated are generally of the automatic type in which the bulbs to be exhausted are located in heads on a rotating turret or on a conveyor and have a transition therewith either continuously or intermittently. As the pumps used in the past were bulky and heavy, they have in most-instances been mounted on a stationary part or" the machine.
  • An object of the invention is to provide for exhaust of a maximum number of bulbs in a machine by a pump without requiring ground-in plates in transmitting the suction of the pump to the bulbs.
  • Another object of the invention is to provide a machine wherein the desired evacuation of a maximum number of bulbs is completed within the time interval of transi tion of a bulb from loading to unloading position with employment of a high-speed high-vacuum pump and without presence of ground-in plates.
  • a further object of the invention is to provide a vacuum chamber in the machine contiguous to the bulb-receiving heads the volume whereof is far in excess of the total volume of bulbs being evacuated.
  • a broad aspect of the invention is to maintain any pressure increase introduced in the vacuum chamber of the machine, due to evacuation of a bulb or bulbs, insignificant in comparison to the status of evacuation or vacuum in said chamber.
  • a purpose of the invention is to utilize a high-speed high-vacuum pump with the load equalized to be approxi mately constant.
  • the invention also contemplates a construction permitting mounting of the pump on the rotating or otherwise moving portion of the machine if so desired.
  • a constructional feature of the invention is to provide contiguous chambers for evacuation by the backer or fore-pump and the high-speed high-vacuum pump respectively both of which have large capacity comparative to the bulbs being evacuated.
  • a structural feature attained is provision of selective utilization of the vacuum of either of said chambers for each bulb during its cycle of transition.
  • FIGURE 1 is a representation of an exhaust machine of rotary type embodying my invention
  • FIGURE 2 is a view similar to FIG. 1, additionally showing provision for preliminary exhaust of bulbs by a hacker or fore-pump;
  • FIGURE 3 is another view of similar character and showing provision for applying the pumps to non-rotating portions of the machine.
  • said turret T provides a chamber 5 coaxial therewith and constituting a large tank diametrically across and included within the turret and extending proximate to the periphery thereof so that the chamber will have a very large volume as compared to the total volume of bulbs 6 to be evacuated, and this large volume amounts, for instance, to twenty to a hundred or more times the volume of all bulbs 6 carried by the turret at the same time.
  • a high-speed high-vacuum pump of adequately large capacity shall be used to maintain the turret vacuum chamber 5 in a state or maximum evacuation during operation of the machine even though air will of necessity be drawn into the chamber from the bulbs and to some extent from the bulb-retaining heads 10 of the machine if the bulbs openers are loose therein and more especially at the moment of removal from or insertion into a head.
  • a verysatisfactory pump for fulfilling the stated requirements is one developed in recent time that produces a very strong suction and high vacuum, and is known in the trade as a Rcots blower or Kinney vacuum pump, and shown for instance in US. Patent 1,623,315 issued April 5, 1927 to I. R.
  • Roots blower makes possible a particularly reliable and quick evacuation.
  • a further advantage of use of the mentioned Roots blower is the fact that the high efiiciency desired is obtained even though the pump has a smaller volume or bulk and less weight than other known vacuum pumps of similar blower output. It may also be said that the etficiency of a Roots blower, especially if it is of multi-stage construction, may be satisfactorily employed without a preliminary or fore-vacuum pump, but if desired an appropriate preliminary booster or fore-pump may be used and applied in the construction of FIG. 1, to a pipe connection 9 shown at the side of the Roots blower or pump 8. The showing of FIG.
  • the pump 8 will be directly fixed with respect to the rotor or turret T and rotated therewith, and of course if a fore-pump is applied to the main pump 8, it will also rotate.
  • the mounting thereof upon and rotation of the same with the turret is feasible and not objectionable and is desirable.
  • turret T On the peripheral margin of turret T is arranged a circular series of receivers or heads 10 for the bulbs 6 which are held therein by tubulations 20 constituting usual parts of bulbs of this character. Said heads have direct connection with the turret chamber and therefore no pipe lines or tubing are required from said chamber to the heads.
  • the direct connection of said heads to the vacuum chamber of the, turret avoids necessity for ground-in, plates to establish communication with the source of vacuum.
  • a peripheral section of the vacuum chamber under each head is; partitioned off from the main portion of that chamber providing a feeding space 25 individual to each head, and in the partition there is a valve 11 proximate to each head to serve as a closure to conserve the vacuum in the main chamber against the outer atmosphere in case of a.
  • valves 11 close absolutely tight because small quantities of in-fiowing air wilL be. readily sucked oflf by the vacuum pump 8, which has, as above stated, a high blower output whereby no notable. increase in pressure in the vacuum chamber 5 occurs.
  • the said; valves 11 for each feeding space 25 can be, operated. in accordance with known valve-operating practice and each is individually.
  • the turret may have such number of bulb-receivers or heads as desired in the manufacture of the machine, and as an. arbitrary example of a usual size of machine forty-eight may be stated as a number employed.
  • the bulbs 6 are applied, at what may be called the front of the machine, one at a time, with tubulation of the bulb introduced into and held by the bulb-receiver or head 10 on.
  • the turret at the loading station of the rotative cycle of said turret, and then as the turret continues to rotate the bulbis evacuated and subjected to other operations thereon and finally near its approach to the loading station is sealed ofi in accordancewith usual practice and arrives at the front of the machine at the unloading station where it is removed from the head 10.
  • the bulbs and contents may be heated in order to more thoroughly expel remainders of gas and water vapor and may also be subjected to commonly employed gettering or flashing as part of the operations of treatment recognized in the art as desirable or necessary in manufacture of lamps, radio tubes and the like of which the bulb is a part.
  • the invention also contemplates utilization of a pre liminary exhaust of the bulb before connecting it directly with the main exhaust of the high-vacuum chamber 5.
  • a pre liminary exhaust of the bulb before connecting it directly with the main exhaust of the high-vacuum chamber 5.
  • FIGS. 2 and 3 Such a construction is shown in FIGS. 2 and 3 which have a fore-vacuum chamber 13 above and coaxial with the main vacuum chamber 5, said fore-chamber also extending proximate to the periphery of the turret.
  • a preliminary vacuum or fore-pump 14 mounted at the top of the turret T is in direct communication with said forevacuum chamber 13 and maintains a desired degree of evacuation therein. As shown in FIG. 2, this forepump 14 may conveniently be mounted directly upon the turret to rotate therewith.
  • FIG. 2 provides a circular series of receivers or heads 10 on the peripheral margin of the turret T and also shows a peripheral section. of the turret under each head as partitionel olf from both the main vacuum chamber 5- and from the fore-vacuum chamber 13 providing a feeding space 25 individual to each head.
  • Valves 11, as before, proximate to each head serve as closures for openings from the main vacuum. chamber into said feeding space proximate to each head 10.
  • Other valves 15 are pro vided for the said feeding space proximate to each head to serve as closures for openings thereinto from the forechamber 13.
  • valves may be by suitable mechanical, electrical or pneumatic means as will be understood by persons skilled in the art. Since the bulb receiver or head 10 opens to the feeding space 25 of the turret, and both the main vacuum chamber 5 and the fore-vacuum chamber 13 have valved communication with said feeding space, a bulb 6 mounted in said head by the bulb tubulation 20 may be subjected initially to vacuum from thefore-vacuum chamber and subsequently to the vacuum of the main chamber by appropriate manipulation of the respective valves to those chambers, which may be done by the aforesaid appropriate mechanical, electrical or pneumatic means.
  • the high-vacuum highspeed or main pump 8 is again preferably a Roots blower or Kinney pump having connection at the bottom of the turret for evacuating the main vacuum chamber 5.
  • pump 8 is shown as having a fixed position, not rotating with the turret.
  • the suction connection 7 of this pump is cylindrical and mounted in telescoped relation to a hollow cylindrical connection 16 rotatable thereon, said connection 16 being integral with. and depending coaxially from the turret.
  • ring gaskets 17 are provided between the lapping ends of said connections 7 and 16 capable of withholding external atmospheric pressure but permitting rotation of the turret and its connection 16 upon the stationary connection 7, and accordingly constituting a stuifiing-box type rotatable vacuum seal between the stationary pump and the rotatable turret. Seals of the stufling-box type can be manufactured much simpler and can be kept tight easier than aforementioned ground-in plates used hitherto in rotating exhaust machines,
  • the abovedescribed preliminary or fore-pump may also be mounted stationary with the turret rotating with respect thereto.
  • FIG. 3 There, at the top of the turret coaxial therewith and in direct communication with the fore-chamber 13 thereof, is a hollow cylindrical connection 18 in overlapped or telescoped relation to a fixed hollow cylindrical connection 19 depending from the stationary fore-pump 14. Ring gaskets 17 such as above described are interposed in tight relation between said connections 18, 19 constituting a stuffing-box type of vacuum seal permitting rotation of the turret T.
  • another rotatable shifting-box type of seal exemplified by gaskets 17 is provided between depending hollow cylindrical connection 16 from the main vacuum chamber and the hollow cylindrical connection 7 upstanding from the highvacuum h gh speed Roots blower 8 corresponding to the showing in and description of FIG 2.
  • the upstanding cylindrical connection 18 at the top of the turret T and the depending cylindrical connection 16 at the bottom of the turret are of course axially aligned so as to permit rotation of the turret with respect to the stationary connections 19 and 7 fixed respectively with respect to the fore-pump 14 and the main pump 8.
  • this filling may be done simply in the machine of this invention by provision of another tube coming from a gas-supply reservoir feeding a.
  • third chamber similar to chambers 5 and 13 and similarly provided with valves into the partitioned-off section or feeding space 25 corresponding to the showing of valves 11 and 15.
  • Such arrangement makes use of the common feeding space for each head not only for the fore evacuation and main evacuation, but also for the gas supply to the bulbs.
  • the fore-pump being used in either FIG.
  • the gas supply may be introduced into chamber 13 thereof to gain entry to the partitioned-elf section or feeding space 25 at properly timed portion of the rotative cycle of the turret.
  • the valve or valves for the vacuum are closed when the valve adm tting the gas is open.
  • connection between the vacuum chambers 5 and 13 and the respective pump thereto common for all bulbs mounted in the several heads consists of only a short and adequately large passageway direct from the pump to the chamber and oliers practically no flow resistance to the air or other gas being evacuated, so the full force of the evacuation is applied to the feeding space 25 and to the tabulations 20 of the bulbs 6 introduced into and held by the respective heads or receivers therefor. While those tubulations are unavoidably relatively small, the fact that the full evacuation force applies directly thereto results in rapid and effective evacuation of the bulbs.
  • One example of use of the exhaust machine of this invention is for incandescent lamps, and with respect thereto a final vacuum of about 10- mm.
  • Hg is ordinarily considered suliicient, and by the disclosed construction and use of the Roots blower or Kinney pump discussed above, this desiredfinal vacuum may be obtained remarkably quickly.
  • the said vacuum is obtained free of contamination of oil either in the vacuum chambers or in the feeding spaces contiguous to the tubulation of the bulbs.
  • the constructions shown wherein a fore-pump is used, that such fore-pump may also be a Roots blower.
  • FIG. 3 The embodiment selected to show such a cold-trap comprises pipe coils 21 arranged in the nature of a battle Within the passageway of connection 7 between vacuum chamber 5 and the main vacuum pump 8. That bafiie is in the path of gases being sucked off and functions to condense the same as they flow past and against the baflle.
  • a cooling brine or other cooling medium should flow through the bafile pipe coils 21, and for that purpose a supply pipe 22 thereto and a discharge pipe 23 therefrom are shown leading to and from said coils passing transversely through one side of stationary connection 16.
  • An exhaust machine for evacuating a number of bulbs each having a tubulation comprising a generally circular enclosure rotatable about an axis, said enclosure providing a large tank vacuum chamber therein of generally circular contour coaxial with said enclosure and extending diametrically across said axis, said enclosure also constituting a rotatable turret having loading and unloading stations and intermediate stations therebetween at some of which at least exhaust of the bulbs is eifected, a pump fixed on said enclosure for maintaining a vacuum in said tank chamber, and a plurality of heads next to the periphery of and carried by said enclosure, said chamber having a series of valve seats each opening next to and into a respective one of said heads, each of said heads adapted to mount a bulb by its said tubulation, a series of valves, one for each of said valve seats, each said head having direct communication with said tank chamber by unseating the respective valve therefor, said turret transferring said bulbs sequentially stepby-step from said loading station to said unloading station, said tank
  • An exhaust machine for evacuating a number of bulbs each having a tubulation comprising a generally circular enclosure rotatable about an axis and providing two coaxial tank vacuum chambers therein of generally circular contour coaxial with said enclosures, one of said tank chambers being located above the other and both of said tank chambers extending diametrically across said axis, said enclosure also contstituting a rotatable turret having loading and unloading stations and intermediate stations therebetween at some of which at least exhaust of the bulbs is eifected, a vacuum pump fixed on said enclosure above and exhausting the upper said one of said tank chambers, and a second vacuum pump coaxially of and below said enclosure exhausting the lower one of said tank chambers, said enclosure being rotatable with respect to said second vacuum pump, and a plurality of headsnext to the periphery of and carried by'said enclosure, each of said heads adapted to mount a bulb by its said tribulation, each of said heads having one opening and valve seat between said head and the upper

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Furnace Details (AREA)
US684009A 1956-09-17 1957-09-16 Exhaust machine for lamp and radio bulbs and the like Expired - Lifetime US3021878A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP17013A DE1016889B (de) 1956-09-17 1956-09-17 Vorrichtung zum Evakuieren einer groesseren Anzahl von Gefaessen mittels derselben Vakuumpumpe

Publications (1)

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US3021878A true US3021878A (en) 1962-02-20

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US684009A Expired - Lifetime US3021878A (en) 1956-09-17 1957-09-16 Exhaust machine for lamp and radio bulbs and the like

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US (1) US3021878A (enrdf_load_stackoverflow)
BE (1) BE560871A (enrdf_load_stackoverflow)
DE (1) DE1016889B (enrdf_load_stackoverflow)
GB (1) GB823120A (enrdf_load_stackoverflow)
NL (1) NL220649A (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1211066B (de) 1963-03-15 1966-02-17 Gretag Ag Halterung fuer die Kopiervorlagen in insbesondere automatischen Kopiergeraeten

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE133740C (enrdf_load_stackoverflow) * 1901-06-13
US1298569A (en) * 1917-01-30 1919-03-25 Gen Electric Apparatus for exhausting incandescent lamps.
US1445811A (en) * 1923-02-20 Ihg co
US1623315A (en) * 1927-04-05 Assigetob to kinney
US1710428A (en) * 1924-10-31 1929-04-23 Gen Electric Method and machine for manufacturing incandescent lamps and similar articles
US1967571A (en) * 1929-10-31 1934-07-24 Rca Corp Exhaust machine
GB463507A (en) * 1935-02-21 1937-04-01 Egyesuelt Izzolampa Improvements in and relating to methods of recovering gas from the pipes or ducts of apparatus for filling electric incandescent lamps or discharge tubes
DE669875C (de) * 1936-11-24 1939-01-06 Frank & Vogel Vorrichtung zur Entlueftung der Kolben elektrischer Gluehlampen und aehnlicher Gefaesse mit um die Achse der Vorrichtung drehbarem Traeger
US2349303A (en) * 1940-08-22 1944-05-23 American Can Co Coating machine
US2386298A (en) * 1943-01-30 1945-10-09 Nat Res Corp Diffusion pump
US2791245A (en) * 1955-07-12 1957-05-07 David W Alcott Evacuating apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH144942A (de) * 1928-11-13 1931-01-31 Wolfgang Dr Phil Gaede Diffusionspumpe.

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1445811A (en) * 1923-02-20 Ihg co
US1623315A (en) * 1927-04-05 Assigetob to kinney
DE133740C (enrdf_load_stackoverflow) * 1901-06-13
US1298569A (en) * 1917-01-30 1919-03-25 Gen Electric Apparatus for exhausting incandescent lamps.
US1710428A (en) * 1924-10-31 1929-04-23 Gen Electric Method and machine for manufacturing incandescent lamps and similar articles
US1967571A (en) * 1929-10-31 1934-07-24 Rca Corp Exhaust machine
GB463507A (en) * 1935-02-21 1937-04-01 Egyesuelt Izzolampa Improvements in and relating to methods of recovering gas from the pipes or ducts of apparatus for filling electric incandescent lamps or discharge tubes
DE669875C (de) * 1936-11-24 1939-01-06 Frank & Vogel Vorrichtung zur Entlueftung der Kolben elektrischer Gluehlampen und aehnlicher Gefaesse mit um die Achse der Vorrichtung drehbarem Traeger
US2349303A (en) * 1940-08-22 1944-05-23 American Can Co Coating machine
US2386298A (en) * 1943-01-30 1945-10-09 Nat Res Corp Diffusion pump
US2791245A (en) * 1955-07-12 1957-05-07 David W Alcott Evacuating apparatus

Also Published As

Publication number Publication date
BE560871A (enrdf_load_stackoverflow)
NL220649A (enrdf_load_stackoverflow)
GB823120A (en) 1959-11-04
DE1016889B (de) 1957-10-03

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