US2901658A - Method of manufacturing a partly silvered tubular incandescent lamp - Google Patents

Method of manufacturing a partly silvered tubular incandescent lamp Download PDF

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Publication number
US2901658A
US2901658A US557366A US55736656A US2901658A US 2901658 A US2901658 A US 2901658A US 557366 A US557366 A US 557366A US 55736656 A US55736656 A US 55736656A US 2901658 A US2901658 A US 2901658A
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US
United States
Prior art keywords
bulb
lamp
support
straps
incandescent 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
US557366A
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English (en)
Inventor
Pero Johannes Gerardus
Honing Wilhelm
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.)
US Philips Corp
North American Philips Co Inc
Original Assignee
US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US2901658A publication Critical patent/US2901658A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/18—Mountings or supports for the incandescent body
    • H01K1/24—Mounts for lamps with connections at opposite ends, e.g. for tubular lamp

Definitions

  • the silver layer on the inner side of the bulb may be damaged when the mount is inserted into the bulb, so that the product obtained is of minor quality.
  • the method according to the invention has for its object to obviate this disadvantage by using supports which are detachable from the longitudinal support of the filament. Particularly with lamps of a length exceeding 50 cms. it is advisable to support the longitudinal support not only at the ends of the lamp but also at a few intermediate areas.
  • the method according to the invention has the feature that first the supporting straps for the longitudinal support are positioned in the bulb, then the inner side of bulb is silverplated and the longitudinal support with the filament arranged thereon is introduced into the bulb and secured in the supporting straps, the lamp being then worked up in the conventional manner.
  • this method the risk of damage to the mirror layer already applied is eliminated, since during the silvering operation those parts of the lamp mount which could give rise to damage during their movement over the silver layer, already occupy their final positions in the lamp bulb.
  • the supporting straps are constituted by helically wound metal wires or strips, the outer diameter of which corresponds substantially to the inner diameter of the bulb, a further advantage is obtained in that the support of the apparatus for silvering the inner side of the bulb and the masks for the bulb parts to be left uncoated can be moved freely in the bulb.
  • Fig. l is a lateral view of the lamp according to the invention: part of the front side of the bulb is broken away to show the interior of the lamp.
  • Fig. 2 is a front view of one of the stay straps.
  • the tubular incandescent lamp shown in Fig. 1 has a bulb 1.
  • a current supply wire 4 In each of the stems 2 and 3, provided each on one side of the bulb, is sealed a current supply wire 4 and respectively, which can be connected electrically to the contact on the unipolar lamp caps (not shown) to be secured to the vessel of the lamp.
  • each of the stems 2 and 3 is sea ed furthermore a stay wire 6 and 7 respectively.
  • a stay wire 6 and 7 To the current supply i e 4 and 5 and t he stay Wire 6 and 7 respectively is secured a yoke 8 and 9' respectively. Between the yokes 8 and 9 the filament 1,0 is stretched in the direction of length of the bulb.
  • the bulb furthermore contains the longitudinal support 11, extending in the direction of length of the bulb and constituted by a glass rod.
  • the longitudinal support 11 is kept in its place with the aid of the ends 12 and 13 of the yokes 8 and 9.
  • the longitudinal support 11 is supported by two resilient, helically wound supports constituted by wire, 20 and 21, of which Fig. 2 shows a front view.
  • a U-shaped, resilient clamp 22 and 22a respectively, for example by soldering.
  • the inner shape of such a clamp corresponds primarily to the outer diameter of the longitudinal support 11.
  • the outer diameter of the straps 20 and 21 is chosen to be such that these straps engage the inner side of the bulb 1 in a slightly resilient manner.
  • the lamp is provided for approximately half of its periphery with a reflecting layer 23 on the inner side of the bulb.
  • the procedure is as follows: before sealing the stems 2 and 3 in the bulb 1, which is then completely cylindrical, the two supporting straps 20 and 21 are secured in place in the bulb via one of the ends of the bulb. Owing to the shape of these straps substantially the whole crosssection of the bulb remains free. Consequently, the apparatus for applying the silver layer to the inner side of the bulb can be introduced into the bulb and displaced therein without being hindered. This also applies to the masks for screening the part of the bulb not to be silvered.
  • the lamp structure comprising the stems 2 and 3, the longitudinal support 11, the supporting wires 27 with eyelets and the filament 10 support by these eyelets can be introduced into bulb via one of the ends in a manner such that the longitudinal support 11 engages the resilient clamps 22. Consequently, during this operation the straps 20 and 21 are not displaced along the silver layer 23 already provided, so that damage of this layer need not be feared.
  • the stems 2 and 3 can be sealed in the bulb, the conical ends 24 and 25 being thus formed.
  • the lamp caps can be applied to the bulb. If afterwards the supports 20 and 21 are displaced slightly along the inner side of the bulb, a narrow, non-silvered part remains in the silver layer 23 where the supporting straps were initially situated.
  • a tubular incandescent lamp comprising an elongated glass envelope being at least partly silvered internally, a plurality of detachable, resilient helical straps engaging at least a portion of the inner periphery of said glass envelope, an elongated support in said glass envelope extending parallel to the longitudinal axis of said envelope, a U-shaped resilient clamp secured to one of said helical straps and fixed to said elongated support, a filament, and means for securing said filament to said elongated support.
  • a tubular incandescent lamp comprising an elongated glass envelope being at least partly silvered internally, a plurality of detachable, helical, resilient straps having an outer diameter corresponding approximately to the inner diameter of said elongated glass envelope, an elongated support in said glass envelope extending parallel to the longitudinal axis of said envelope, a substantially U-shaped clamp affixed to a bottom portion of one of said helical straps and substantially embracing said support to thereby secure said support to said glass envelope, a fila' ment, and means for securing said filament to said elongated support.

Landscapes

  • Resistance Heating (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US557366A 1955-01-05 1956-01-04 Method of manufacturing a partly silvered tubular incandescent lamp Expired - Lifetime US2901658A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL788269X 1955-01-05

Publications (1)

Publication Number Publication Date
US2901658A true US2901658A (en) 1959-08-25

Family

ID=19832332

Family Applications (1)

Application Number Title Priority Date Filing Date
US557366A Expired - Lifetime US2901658A (en) 1955-01-05 1956-01-04 Method of manufacturing a partly silvered tubular incandescent lamp

Country Status (6)

Country Link
US (1) US2901658A (fr)
BE (1) BE544147A (fr)
DE (1) DE1004732B (fr)
FR (1) FR1139963A (fr)
GB (1) GB788269A (fr)
NL (2) NL87548C (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3930178A (en) * 1973-07-10 1975-12-30 Thorn Electrical Ind Ltd Electrical incandescent filament devices
US4384235A (en) * 1979-05-22 1983-05-17 Thorn Emi Limited Linear filament assembly with refractory insulating support rod for halogen lamp
US4613787A (en) * 1980-02-06 1986-09-23 Thorn Emi Limited Lamps filament supports for tungsten halogen incandescent

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1738957A (en) * 1923-04-16 1929-12-10 Magnavox Co Photo-electric tube
US1800037A (en) * 1927-11-24 1931-04-07 Gen Electric Tubular incandescent lamp
US1885431A (en) * 1927-12-13 1932-11-01 Grote Edwin Rudolph Electric incandescent lamp and holder thereof
US2032791A (en) * 1933-04-20 1936-03-03 Gen Electric Tubular and other incandescent lamps and their manufacture
US2032945A (en) * 1932-04-21 1936-03-03 Westinghouse Lamp Co 115 volt ultra-violet lamp
US2114175A (en) * 1937-03-13 1938-04-12 Gen Electric Electric lamp or similar device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1738957A (en) * 1923-04-16 1929-12-10 Magnavox Co Photo-electric tube
US1800037A (en) * 1927-11-24 1931-04-07 Gen Electric Tubular incandescent lamp
US1885431A (en) * 1927-12-13 1932-11-01 Grote Edwin Rudolph Electric incandescent lamp and holder thereof
US2032945A (en) * 1932-04-21 1936-03-03 Westinghouse Lamp Co 115 volt ultra-violet lamp
US2032791A (en) * 1933-04-20 1936-03-03 Gen Electric Tubular and other incandescent lamps and their manufacture
US2114175A (en) * 1937-03-13 1938-04-12 Gen Electric Electric lamp or similar device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3930178A (en) * 1973-07-10 1975-12-30 Thorn Electrical Ind Ltd Electrical incandescent filament devices
US4384235A (en) * 1979-05-22 1983-05-17 Thorn Emi Limited Linear filament assembly with refractory insulating support rod for halogen lamp
US4613787A (en) * 1980-02-06 1986-09-23 Thorn Emi Limited Lamps filament supports for tungsten halogen incandescent

Also Published As

Publication number Publication date
FR1139963A (fr) 1957-07-09
NL87548C (fr)
GB788269A (en) 1957-12-23
NL193793A (fr)
DE1004732B (de) 1957-03-21
BE544147A (fr)

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