US3927354A - Device for generating electric sparks for igniting flammable vapors containing gas and air - Google Patents

Device for generating electric sparks for igniting flammable vapors containing gas and air Download PDF

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Publication number
US3927354A
US3927354A US490213A US49021374A US3927354A US 3927354 A US3927354 A US 3927354A US 490213 A US490213 A US 490213A US 49021374 A US49021374 A US 49021374A US 3927354 A US3927354 A US 3927354A
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United States
Prior art keywords
condenser
spark
air
electrets
charge
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
US490213A
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English (en)
Inventor
Herbert Bauser
Dieter Fischer
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Braun GmbH
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Braun GmbH
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Filing date
Publication date
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Publication of US3927354A publication Critical patent/US3927354A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q2/00—Lighters containing fuel, e.g. for cigarettes
    • F23Q2/28—Lighters characterised by electrical ignition of the fuel
    • F23Q2/285—Lighters characterised by electrical ignition of the fuel with spark ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q3/00—Igniters using electrically-produced sparks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making

Definitions

  • ABSTRACT A spark generating device is described comprising a condenser connected to spaced electrodes forming a spark gap and electrically polarized elements rotatably disposed forcharging the condenser.
  • the primary object of the invention is to provide an ignition device which requires-no depletable source of energy, and is free from service maintenance.
  • the ignition device hereunder may be manufactured at relatively low cost.
  • the ignition device is small in size so that it can be incorporated into pocket-size cigarette lighters.
  • FIG. l-a is a schematic representation of an electrical circuit utilizing an electret as the charging element with the latter in a position about to be inserted between conductive plates.
  • FIG. l-b is a circuit similar to that of FIG. l-a showing the electret in the inserted position.
  • FIG. 2 is an exploded view in perspective illustrating a practical embodiment for use in pocket-size lighters.
  • An electret is a permanently polarized piece of dielectric material analogous to a magnet. Ceramics, such as barium titanate, can be so polarized under certain conditions when subjected to an electric field. Electrets are also produced by solidification of mixtures of certain organic waxes in a strong electric field. They may be produced in the form of thin disk-shaped dielectric materials and retain their polarization for an extended time some over years. Consequently, they outlive the normally useful life of any mechanical assembly in which they may be incorporated, for example, in cigarette lighters.
  • FIGS. La and H2 the principle of operation is illustrated in FIGS. La and H2.
  • An electret l is about to be inserted between two conducting plates, such as metal plates 2a and 2b. These plates are conductively connected to a condenser C which is in parallel with two ball-shaped electrodes 5a and 5b forming the spark gap 4.
  • the insertion creates a charge on plates 2a and 2b of a polarity opposite to that of the polarization of the electret 1. Since the circuit components, namely, 2a and 2b, 3, C, 5a and 5b we re originally not charged, the induced charge on plates 2a and 2b results in charges opposite to that of the electret. If this charge is sufficiently high to produce an electric field which breaks down the air resistance between the electrodes 5a and 5b, the opposite charges discharge in the form of a spark between the electrodes. However, the induced charge on plates 20 and 2b remains unaltered. By sufficient charge and electrical energy, the resultant spark will ignite a mixture of flammable gas and air.
  • a good electret in air can be charged to about 10' amp/cm and, in inert gas such as SP to SXIO amp/cm If we take a charge of 2 l0 amp/cm it is necessary for the storage of the required charge of 3.2 l0 to have a surface of 160 cm
  • the capacitance of the charged condenser must be The above-stated conditions permit the design, in accordance with the invention, of a compact cigarette lighter mechanism as illustrated in FIG. 2.
  • the electret l is in the form of a disk of which the electrical polarization of one-half is opposite to that of the other half. Above and below the electrets are placed divided metal disks 2 of which each half is electrically insulated from the other half. These are similarly interconnected by conductor 3 with condenser C and spark gap 4.
  • the electret is rotatable over an axis 6 while the metal plates are solidly affixed to supports 7.
  • each disk half In the starting condition there will be no induced charge on the metal disks inasmuch as each half lays between oppositely charged quarter segments of the electrets. However, when the electret is turned then each disk half lays over a particular polarized portion of the electret. In this manner, each disk half receives an induced charge of opposite polarity to that of the segment of the electret. Over the conductors 3 of the similarly charged disk halves 2, there develops an opposite charge on the condenser and between poles of the spark gap, the total charge of opposite polarity. It is seen from FIG. 2 that a spark will be created at every 90 rotation of the electret.
  • each electret is 0.2 mm and the thickness of the metal disks is 0.04 mm.
  • these disks form a roll having a thickness of 0.08 mm. The electrets are within this roll so that there is an air space of 0.02 mm between the disks and the electrets. In this manner, losses due to friction are eliminated. In addition, charges due to static electricity are minimized.
  • the total thickness of this construction is 8 X 0.2mm 9 X 0.9mm 2.4mm.
  • the condenser C consists of a metallized plastic of 0.15 mm thickness. If the plastic has a dielectric con- 3 stant of E 3, the capacitance of the condenser will be C 400 pF. j
  • this condenser including a dielectric of 0.15mm thickness, is mountedon the assembly so that the total thickness of the igniter is 2.7mm. With a diameter of 5cm, a space of 5.4cm is needed. The anchoring of the spark gap will take another cubic centimeter so that the total volume of the igniter is around 65cm. This arrangement is sufficiently compact to fit any pocket lighter.
  • a device for generating an electric spark for the ignition of gas-air mixtures comprising a circuit including a condenser, a pair of electrodes connected bewhereby, upon rotation of said electrets, said sets of 7 disk members receive a charge of opposite polarity, causing a cumulative charge transfer on said condenser, resulting in a spark discharge between said pair of electrodes.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Elimination Of Static Electricity (AREA)
  • Air Bags (AREA)
US490213A 1973-07-23 1974-07-19 Device for generating electric sparks for igniting flammable vapors containing gas and air Expired - Lifetime US3927354A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732337347 DE2337347A1 (de) 1973-07-23 1973-07-23 Vorrichtung fuer die erzeugung elektrischer funken zum zuenden von gas-luftgemischen

Publications (1)

Publication Number Publication Date
US3927354A true US3927354A (en) 1975-12-16

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Family Applications (1)

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US490213A Expired - Lifetime US3927354A (en) 1973-07-23 1974-07-19 Device for generating electric sparks for igniting flammable vapors containing gas and air

Country Status (5)

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US (1) US3927354A (ja)
JP (1) JPS5071461A (ja)
CH (1) CH564732A5 (ja)
DE (1) DE2337347A1 (ja)
FR (1) FR2238900A1 (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4288735A (en) * 1979-09-17 1981-09-08 Mcdonnell Douglas Corp. Vibrating electret reed voltage generator
US20140163708A1 (en) * 2011-07-25 2014-06-12 Sony Computer Entertainment Inc Portable electronic device, signal processing method and playback method
CN105466291A (zh) * 2015-12-11 2016-04-06 北京理工大学 一种无需外部供电的自驱动点火装置及其制备方法
CN105566020A (zh) * 2015-12-16 2016-05-11 北京理工大学 一种无需外部供电的自驱动电雷管及其制备方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3364393A (en) * 1964-09-07 1968-01-16 Maltner Heinrich Gmbh Arrangement for igniting combustible fluid
US3384786A (en) * 1965-12-28 1968-05-21 Mansei Kogyo Kk Manually operable piezoelectric gas lighters
US3444435A (en) * 1966-07-16 1969-05-13 Richard Halm Electromagnetic ignition device,particularly for lighters
US3517206A (en) * 1968-04-08 1970-06-23 Itek Corp Apparatus and method for optical read-out of internal electric field
US3550257A (en) * 1965-03-26 1970-12-29 Du Pont Apparatus and method for fabricating a filter unit
US3748727A (en) * 1968-07-11 1973-07-31 W Swain Method of making electret transducers
US3817694A (en) * 1971-06-11 1974-06-18 Tanita Seisakusho Kk Ignition device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3364393A (en) * 1964-09-07 1968-01-16 Maltner Heinrich Gmbh Arrangement for igniting combustible fluid
US3550257A (en) * 1965-03-26 1970-12-29 Du Pont Apparatus and method for fabricating a filter unit
US3384786A (en) * 1965-12-28 1968-05-21 Mansei Kogyo Kk Manually operable piezoelectric gas lighters
US3444435A (en) * 1966-07-16 1969-05-13 Richard Halm Electromagnetic ignition device,particularly for lighters
US3517206A (en) * 1968-04-08 1970-06-23 Itek Corp Apparatus and method for optical read-out of internal electric field
US3748727A (en) * 1968-07-11 1973-07-31 W Swain Method of making electret transducers
US3817694A (en) * 1971-06-11 1974-06-18 Tanita Seisakusho Kk Ignition device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4288735A (en) * 1979-09-17 1981-09-08 Mcdonnell Douglas Corp. Vibrating electret reed voltage generator
US20140163708A1 (en) * 2011-07-25 2014-06-12 Sony Computer Entertainment Inc Portable electronic device, signal processing method and playback method
US9679052B2 (en) * 2011-07-25 2017-06-13 Sony Corporation Portable electronic device, signal processing method and playback method
CN105466291A (zh) * 2015-12-11 2016-04-06 北京理工大学 一种无需外部供电的自驱动点火装置及其制备方法
CN105466291B (zh) * 2015-12-11 2017-01-25 北京理工大学 一种无需外部供电的自驱动点火装置及其制备方法
CN105566020A (zh) * 2015-12-16 2016-05-11 北京理工大学 一种无需外部供电的自驱动电雷管及其制备方法

Also Published As

Publication number Publication date
DE2337347A1 (de) 1975-02-20
JPS5071461A (ja) 1975-06-13
FR2238900A1 (ja) 1975-02-21
CH564732A5 (ja) 1975-07-31

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