US3836317A - Percussion type photoflash lamp - Google Patents

Percussion type photoflash lamp Download PDF

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Publication number
US3836317A
US3836317A US00370329A US37032973A US3836317A US 3836317 A US3836317 A US 3836317A US 00370329 A US00370329 A US 00370329A US 37032973 A US37032973 A US 37032973A US 3836317 A US3836317 A US 3836317A
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United States
Prior art keywords
tube
anvil
head
photoflash lamp
envelope
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Expired - Lifetime
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US00370329A
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J Lukas
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Osram GmbH
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Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K5/00—Light sources using charges of combustible material, e.g. illuminating flash devices
    • F21K5/02—Light sources using charges of combustible material, e.g. illuminating flash devices ignited in a non-disrupting container, e.g. photo-flash bulb
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B17/00—Sulfur; Compounds thereof
    • C01B17/64—Thiosulfates; Dithionites; Polythionates

Definitions

  • the J 20 1972 G 2230005 anvil abuts the tube end with its head.
  • the head length emmy is about twice its diameter so that the contact surface is sufficiently large for centering of the anvil inside the gill.
  • tube The anvil portion of the pin extends in the cussion Zone and carries an ignition material.
  • the di [58] Field of Search 431/92, 93, 94 ameter of the anvil portion is Selected Such that there [56] IR eferences Cited remains a sufficiently large gap between anvil and tube.
  • the present invention relates to photoflash lamps which comprise a light-transmissive envelope containing combustible material and a combustion-sustaining substance, and on which a mechanically releasable ignition or primer is provided, comprising a small metal tube sealed into the envelope.
  • the tube is in communication with the interior of the envelope; the end thereof which projects externally of the envelope is closed and contains a percussive igniting material.
  • the igniting material has been proposed to apply the igniting material to a wire which is secured inside the tube and functions simultaneously as a carrier for the substance and as an anvil.
  • the wire end is thickened to form a head which is used for preliminary centering when inserting it in the tube and for securing it therein.
  • the wire is provided with three or four lugs which may be formed, for instance, by beads and which are used to center the wire in the tube.
  • the length of wire extending between head and lug is coated with igniting material.
  • the wire is usually coated by immersing it in ignition paste.
  • the resulting coating on the wire head is undesirable and, consequently, is removed by wiping it off in an additional working step. Due to the required lugs and the coating procedure with subsequent wiping off, manufacture of the anvil becomes very complex; it is therefore important for simplification of the manufacturing process and price reduction, to develop a more simple anvil design.
  • a headed metal pin is disposed to function as an anvil; its head is supported and centered inside the tube.
  • the pin section extending in the percussion zone is of smaller diameter than the head, and is coated with an ignition paste e.g., applied by dipping, while holding the pin on the head.
  • the head of the anvil has a length of up to about two times its diameter to insure satisfactory centering of the metal pin in the tube even without the provision of additional lugs at half its length. Since that portion of the anvil previously provided with lugs may now be omitted, the length of the anvil is reduced. This permits not only a reduction in length of the photoflash lamp but also of a possible fixture such as, for example, a flashcube.
  • the headed pin anvil permits coating with igniting material by immersion dippingwhile, the head is supported and thus kept free of coating. It will therefore remain free of coating material and not even have a thin film, or residues, or traces thereon.
  • FIG. 1 is a part and vertical section of the ignition device
  • FIG. 2 is another embodiment of the ignition device, partly in section.
  • the ignition device illustrated in FIG. I for mechanically ignitable photoflash lamps comprises a tube 1 which is deep-drawn from copper sheet and, is capped off at its closed end 2.
  • the open end 3 of tube 1 is slightly conically expanded which considerably improves sealing into the glass envelope 4 shown in fragmentary form only.
  • An anvil 5, in form of a headed pin is introduced in the tube e.g. by dropping it in.
  • Head 6 of anvil 5 is locked inside the cap-shaped end 2.
  • the head length is about twice its diameter; thus the contact surface between anvil 5 and tube 1 is relatively large to ensure centering of the anvil within the tube.
  • the anvil 5 tapers towards section 7 extending across the percussion zone to a diameter which is slightly smaller than that of head 6.
  • Section 7 extending across the percussion; zone is coated, for instance, by immersion with the percussive igniting material 8.
  • the difference in diameter between head 6 and section 7 extending across the percussion zone is selected such that there remains a gap of at least 50 u between coated anvil and tube 1 even when the thickness of coating of the igniting material is t.
  • the head 6 remains uncoated because the anvil can be supported at its head portion.
  • section 10 of the anvil extending across the percussion zone may be of slightly conical design whereby the flame generated upon percussive ignition viz. the hot particles ejected from the tube are directed more precisely at zirconium shreds (not shown) contained in glass envelope 4.
  • the anvil means comprises a pin (5, 6, 7) disposed in the tube, the pin having a head (6) and an anvil section (7), the head being supported at the closed end (2) of the tube (l) and being in centering engagement inside the tube solely by engagement of the head (6) and the closed end.
  • (2) of the tube (1) said tube being indented (9) graduallyely above the head of the anvil, and locking the head in position therein by the indentation (9) of the tube (1), the head having a length of approximately two times its diameter, its outer surface being in engagement with the end (2) of the tube throughout its length;

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Treating Waste Gases (AREA)
  • Paper (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

To hold a counter anvil in place in the percussion tube of the lamp, a headed pin forming the anvil is supported in the capshaped closed end of the tube. The anvil abuts the tube end with its head. The head length is about twice its diameter so that the contact surface is sufficiently large for centering of the anvil inside the tube. The anvil portion of the pin extends in the percussion zone and carries an ignition material. The diameter of the anvil portion is selected such that there remains a sufficiently large gap between anvil and tube.

Description

[Him 1 [1 1 [111 3,836,317 llsultas Sept, 17, 1974 [54] PIECUSSION TYPE PHOTOFLASH LAMP 3,776,685 12/1973 Senft et al 431 93 [75] Inventor: Josef Lukas, Augsburg, Germany [73] Assignee' Patent-Treuhand-Gesellschaft fur Primary Examinercarro" Domy elemrische Gluhlampen mbH Attorney, Agent, or Firm-Flynn & Frishauf 9 Munchen, Germany [22] Filed: June 15, 11973 [57] ABSTRACT PP 370,329 To hold a counter anvil in place in the percussion tube of the lamp, a headed pin forming the anvil is sup [30] Foreign Applicatiun Priority Dam ported in the cap-shaped closed end of the tube. The J 20 1972 G 2230005 anvil abuts the tube end with its head. The head length emmy is about twice its diameter so that the contact surface is sufficiently large for centering of the anvil inside the gill. tube The anvil portion of the pin extends in the cussion Zone and carries an ignition material. The di [58] Field of Search 431/92, 93, 94 ameter of the anvil portion is Selected Such that there [56] IR eferences Cited remains a sufficiently large gap between anvil and tube. UNITED STATES PATENTS 3,567,351 3/1972 Harvey .I 431/93 5 Claims, 2 Drawing Figures PATENTED SEP 1 7 I974 FIG. 2
FIG. I
PERCUSSION TYPE Pll-IIOTOFLASIHI LAMP The present invention relates to photoflash lamps which comprise a light-transmissive envelope containing combustible material and a combustion-sustaining substance, and on which a mechanically releasable ignition or primer is provided, comprising a small metal tube sealed into the envelope. The tube is in communication with the interior of the envelope; the end thereof which projects externally of the envelope is closed and contains a percussive igniting material.
It has been proposed to apply the igniting material to a wire which is secured inside the tube and functions simultaneously as a carrier for the substance and as an anvil. The wire end is thickened to form a head which is used for preliminary centering when inserting it in the tube and for securing it therein. At about half its length, the wire is provided with three or four lugs which may be formed, for instance, by beads and which are used to center the wire in the tube. The length of wire extending between head and lug is coated with igniting material.
The wire is usually coated by immersing it in ignition paste. The resulting coating on the wire head is undesirable and, consequently, is removed by wiping it off in an additional working step. Due to the required lugs and the coating procedure with subsequent wiping off, manufacture of the anvil becomes very complex; it is therefore important for simplification of the manufacturing process and price reduction, to develop a more simple anvil design.
SUBJECT MATTER OF THE INVENTION Inside the metal tube in the region projecting externally of the lamp envelope, a headed metal pin is disposed to function as an anvil; its head is supported and centered inside the tube. The pin section extending in the percussion zone is of smaller diameter than the head, and is coated with an ignition paste e.g., applied by dipping, while holding the pin on the head.
The head of the anvil has a length of up to about two times its diameter to insure satisfactory centering of the metal pin in the tube even without the provision of additional lugs at half its length. Since that portion of the anvil previously provided with lugs may now be omitted, the length of the anvil is reduced. This permits not only a reduction in length of the photoflash lamp but also of a possible fixture such as, for example, a flashcube. The headed pin anvil permits coating with igniting material by immersion dippingwhile, the head is supported and thus kept free of coating. It will therefore remain free of coating material and not even have a thin film, or residues, or traces thereon.
The invention will be described by way of example with reference to the accompanying drawings, wherein:
FIG. 1 is a part and vertical section of the ignition device;
FIG. 2 is another embodiment of the ignition device, partly in section.
The ignition device illustrated in FIG. I for mechanically ignitable photoflash lamps comprises a tube 1 which is deep-drawn from copper sheet and, is capped off at its closed end 2. The open end 3 of tube 1 is slightly conically expanded which considerably improves sealing into the glass envelope 4 shown in fragmentary form only. An anvil 5, in form of a headed pin is introduced in the tube e.g. by dropping it in. Head 6 of anvil 5 is locked inside the cap-shaped end 2. The head length is about twice its diameter; thus the contact surface between anvil 5 and tube 1 is relatively large to ensure centering of the anvil within the tube.
Starting from head 6, the anvil 5 tapers towards section 7 extending across the percussion zone to a diameter which is slightly smaller than that of head 6. Section 7 extending across the percussion; zone is coated, for instance, by immersion with the percussive igniting material 8. The difference in diameter between head 6 and section 7 extending across the percussion zone is selected such that there remains a gap of at least 50 u between coated anvil and tube 1 even when the thickness of coating of the igniting material is t. When immersing anvil 5, the head 6 remains uncoated because the anvil can be supported at its head portion.
After insertion by dropping the coated anvil 5 head first, into the tube, it is locked in tube 1 by indenting the tube, e.g., forming a ring-shaped groove 9 adjacent head 6 where the latter merges with section 7 extending across the percussion zone.
As is to be seen from FIG. 2, section 10 of the anvil extending across the percussion zone may be of slightly conical design whereby the flame generated upon percussive ignition viz. the hot particles ejected from the tube are directed more precisely at zirconium shreds (not shown) contained in glass envelope 4.
I claim:
ll. In a photoflash lamp a light-transmissive envelope (6) which contains combustible material and a combustion-sustaining substance,
a metal tube (1) sealed in the envelope (4), the tube being in communication with the interior of the envelope and having a percussion zone intermediate its length, the end (2) of the tube projecting externally of the envelope being closed;
and anvil means (5) carrying per-cussive igniting material in the tube,
the improvement wherein the anvil means comprises a pin (5, 6, 7) disposed in the tube, the pin having a head (6) and an anvil section (7), the head being supported at the closed end (2) of the tube (l) and being in centering engagement inside the tube solely by engagement of the head (6) and the closed end. (2) of the tube (1), said tube being indented (9) imediately above the head of the anvil, and locking the head in position therein by the indentation (9) of the tube (1), the head having a length of approximately two times its diameter, its outer surface being in engagement with the end (2) of the tube throughout its length;
and the anvil section (7) of the pin being of smaller diameter than the head (6), and tapering from the head to the upper end of the anvil means which lies within the tube and being coated with an ignition paste, said tube and anvil section being face of any protrusions between the indented portion of the tube and the upper end of said anvil means.
2. A photoflash lamp as claimed in claim 11, wherein the anvil section extending across the percussion zone is of cone shape (Ill).
3.. A photoflash lamp as claimed in claim 1, wherein the inner end (3) of the tube l) at its seal to the glass envelope (4) is flared.
4. A photoflash lamp as claimed in claim 1, wherein the head (6) is completely free of coating material and the tube is formed with a ring groove to form the indenforms a holder for immersion in percussion material of tation thereof. the anvil portion only to only coat the anvil portion.
5. A photoflash lamp as claimed in claim 1, wherein UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,836,317 Dated September 17, 1974 Inventorfls) Josef LUKAS It is certified that error appears in the above-identified. patent and that said Letters Patent are hereby corrected as shown below:
The priority data should read correctly:
- Germany/ 20 June 1972, number 2230,052
Signed and sealed this 4th day of February 1975.
(SEAL) Attest:
McCOY M. GIBSON JR. C. MARSHALL DANN Attesting Officer Commissioner of Patents

Claims (5)

1. In a photoflash lamp a light-transmissive envelope (4) which contains combustible material and a combustion-sustaining substance, a metal tube (1) sealed in the envelope (4), the tube being in communication with the interior of the envelope and having a percussion zone intermediate its length, the end (2) of the tube projecting externally of the envelope being closed; and anvil means (5) carrying percussive igniting material in the tube, the improvement wherein the anvil means comprises a pin (5, 6, 7) disposed in the tube, the pin having a head (6) and an anvil section (7), the head being supported at the closed end (2) of the tube (1) and being in centering engagement inside the tube solely by engagement of the head (6) and the closed end (2) of the tube (1), said tube being indented (9) imediately above the head of the anvil, and locking the head in position therein by the indentation (9) of the tube (1), the head having a length of approximately two times its diameter, its outer surface being in engagement with the end (2) of the tube throughout its length; and the anvil section (7) of the pin being of smaller diameter than the head (6), and tapering from the head to the upper end of the anvil means which lies within the tube and being coated with an ignition paste, said tube and anvil section being face of any protrusions between the indented portion of the tube and the upper end of said anvil means.
2. A photoflash lamp as claimed in claim 1, wherein the anvil section extending across the percussion zone is of cone shape (10).
3. A photoflash lamp as claimed in claim 1, wherein the inner end (3) of the tube (1) at its seal to the glass envelope (4) is flared.
4. A photoflash lamp as claimed in claim 1, wherein the tube is formed with a ring groove to form the indentation thereof.
5. A photoflash lamp as claimed in claim 1, wherein the head (6) is completely free of coating material and forms a holder for immersion in percussion material of the anvil portion only to only coat the anvil portion.
US00370329A 1972-06-20 1973-06-15 Percussion type photoflash lamp Expired - Lifetime US3836317A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2230005A DE2230005A1 (en) 1972-06-20 1972-06-20 PROCESS FOR THE CONTINUOUS PRODUCTION OF CRYSTALLIZED AMMONIUM THIOSULPHATE

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US00370329A Expired - Lifetime US3836317A (en) 1972-06-20 1973-06-15 Percussion type photoflash lamp
US05/370,686 Expired - Lifetime US3937793A (en) 1972-06-20 1973-06-18 Process for the continuous manufacture of crystallized ammonium thiosulfate

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Application Number Title Priority Date Filing Date
US05/370,686 Expired - Lifetime US3937793A (en) 1972-06-20 1973-06-18 Process for the continuous manufacture of crystallized ammonium thiosulfate

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JP (1) JPS4969595A (en)
AT (1) AT329593B (en)
AU (1) AU5702973A (en)
BE (1) BE801189A (en)
CA (1) CA988675A (en)
DE (1) DE2230005A1 (en)
FR (1) FR2189311B1 (en)
GB (1) GB1429048A (en)
IT (1) IT989262B (en)
NL (1) NL7308367A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3955911A (en) * 1973-04-16 1976-05-11 U.S. Philips Corporation Percussion flashlamp
US20190195439A1 (en) * 2017-12-22 2019-06-27 Ledvance Gmbh Tube Lamp with Leadframe

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4478807A (en) * 1982-09-30 1984-10-23 Ott Clifford J Method for manufacture of ammonium thiosulfate from ammonia and _solid sulfur or H2 S rich gas stream and/or both solid sulfur _and H2 S gas streams
US5618658A (en) * 1995-02-22 1997-04-08 Fuji Hunt Photographic Chemicals, Inc. Process for producing an ammonium thiosulfate product
US6534030B2 (en) * 2001-03-14 2003-03-18 El Paso Merchant Energy Petroleum Company Process for producing ammonium thiosulfate
US7052669B2 (en) 2001-04-05 2006-05-30 Haldor Topsoe A/S Process for production of ammonium thiosulphate
WO2003002455A1 (en) * 2001-06-27 2003-01-09 Ray Michael F Process for aqueous phase oxidation of sulfur or sulfide to thiosulfate, bisulfite or sulfite ions using air
US20030059352A1 (en) * 2001-08-07 2003-03-27 Maurice Karras Process and apparatus for scrubbing sulfur dioxide from flue gas and conversion to fertilizer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3567351A (en) * 1969-03-03 1971-03-02 Sylvania Electric Prod Percussively ignitable flashbulbs having means for determining the condition thereof
US3776685A (en) * 1971-11-15 1973-12-04 Gen Electric Flashlamp primer precoating

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2219258A (en) * 1939-12-05 1940-10-22 American Cyanamid Co Solid ammonium thiosulphate
US3431070A (en) * 1964-04-28 1969-03-04 Union Oil Co Method of treating ammonia and hydrogen sulfide gases to produce ammonium thiosulfate and sulfur therefrom
DE1265146C2 (en) * 1966-03-05 1973-01-18 Goldschmidt Ag Th Process for the continuous production of preferably concentrated aqueous ammonium thiosulphate solutions

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3567351A (en) * 1969-03-03 1971-03-02 Sylvania Electric Prod Percussively ignitable flashbulbs having means for determining the condition thereof
US3776685A (en) * 1971-11-15 1973-12-04 Gen Electric Flashlamp primer precoating

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3955911A (en) * 1973-04-16 1976-05-11 U.S. Philips Corporation Percussion flashlamp
US20190195439A1 (en) * 2017-12-22 2019-06-27 Ledvance Gmbh Tube Lamp with Leadframe
US11251349B2 (en) * 2017-12-22 2022-02-15 Ledvance Gmbh Tube lamp with leadframe
US11757081B2 (en) 2017-12-22 2023-09-12 Ledvance Gmbh Tube lamp with leadframe

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FR2189311A1 (en) 1974-01-25
BE801189A (en) 1973-12-20
JPS4969595A (en) 1974-07-05
AT329593B (en) 1976-05-25
DE2230005A1 (en) 1974-01-17
AU5702973A (en) 1974-12-19
US3937793A (en) 1976-02-10
IT989262B (en) 1975-05-20
FR2189311B1 (en) 1976-11-12
NL7308367A (en) 1973-12-27
ATA531773A (en) 1975-08-15
GB1429048A (en) 1976-03-24
CA988675A (en) 1976-05-11

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