US3416450A - Friction ignitor - Google Patents

Friction ignitor Download PDF

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Publication number
US3416450A
US3416450A US587482A US58748266A US3416450A US 3416450 A US3416450 A US 3416450A US 587482 A US587482 A US 587482A US 58748266 A US58748266 A US 58748266A US 3416450 A US3416450 A US 3416450A
Authority
US
United States
Prior art keywords
friction
ignitor
cartridge
charge
wire
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
US587482A
Other languages
English (en)
Inventor
Ballreich Kurt
Ketterl Alfred
Spranger Wolfgang
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.)
Dynamit Nobel AG
Original Assignee
Dynamit Nobel AG
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 Dynamit Nobel AG filed Critical Dynamit Nobel AG
Application granted granted Critical
Publication of US3416450A publication Critical patent/US3416450A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/10—Initiators therefor
    • F42B3/117—Initiators therefor activated by friction

Definitions

  • Another object of the present invention is to provide a friction ignition device which prevents the combustion gases and other burning particles from escaping from the ignitor to the outside.
  • a further object of the present invention is to provide a friction ignitor that assures completely satisfactory ignition as well as reliable operation at all times.
  • the friction ignitor of the present invention comprises a cartridge having a friction end and a detonating end, and a friction wire, said friction wire having a coiled end portion and an uncoiled portion.
  • the coiled end portion of the wire is disposed on the inside of the cartridge and extends toward the detonator end of the cartridge.
  • the uncoiled portion extends from the coiled portion through the friction end of the cartridge to the outside of the friction ignitor,
  • a priming material is provided between the coiled end portion of the wire and the friction end of the car- 3,416,450 Patented Dec. 17, 1968 tridge.
  • the particles are spherically shaped.
  • An additional detonating charge, ignition reinforcing charge, delaying charge, or other type of charge is disposed between these spherically shaped particles and the detonating end of the cartridge.
  • the pulling of the friction wire ignites the priming material which in turn ignites the additional detonating charge.
  • This additional charge quickly and reliably ignites the main charge to be detonated, for example, a pyrotechnic mixture, and also provides sufficient heat to melt the spherical particles inserted in the cartridge.
  • the molten spherical particles are pressed into and around the sleeve of the detonating means within the cartridge, where after a very short time they solidify, closing the opening produced by pulling the friction wire.
  • the exit of combustion gases, or the ejection of burning particles from the ignited charge is substantially eliminated.
  • one of the spherical particles used in the cartridge is made substantially larger than the remaining particles, for example, with a diameter of at least about of the inside diameter of the ignitor sleeve.
  • This larger particle is inserted in the ignitor cartridge with part of its spherical body extending into the inside cross section of the coiled end portion of the friction wire.
  • the remaining smaller particles can be grouped around the larger particle and extend in the direction of the additional detonator charge.
  • the material represented by the remaining particles effects sealing between the detonator cartridge and the sleeve for the priming substance.
  • lead which is the preferred material used in making the particles
  • other materials melting at still lower temperatures may also be used, such as for example, low temperature metal alloys.
  • an improvement in the sealing effect can also be obtained by providing at one end of the cartridge a disk of thermoplastic synthetic material, preferably polytetrafluoroethylene (Teflon).
  • Thisdisk is adapted to the inside cross section of the ignitor cartridge and is provided with a correspondingly dimensioned central bore for passing the friction wire therethrough.
  • the friction ignitor is generally completely surrounded by the main charge to be ignited and thus the fixed positioning of the additional detonator charge in the interior of the ignitor cartridge is automatically determined, it is generally suitable if the ignitor cartridge is slightly drawn in at the end facing the charge to be ignited.
  • the additional detonator charge can be any easily ignitable mixture, such as, for example, a mixture containing about 60 parts by weight of lead dioxide and about 40 parts by weight of metallic silicon.
  • friction pull ignitor wire 5 passes centrally through the bottom of the cartridge and its spirally wound end is inserted in the ignitor cartridge 1.
  • the other end of the wire, located outside the cartridge, is shaped in the form of a loop.
  • disk 2 which may be made of a thermoplastic material, such as, for example, Teflon, an intermediate disk 3 and a friction primer material 4. All of these elements are provided with a central bore for passing the friction wire therethrough.
  • the primer cap 4 at first ignites the additional detonator charge 8. The latter then ignites the main charge which is to 'be detonated, this charge not being shown in the drawing. Simultaneously, the heat developing during the reaction of the additional detonator charge 8 effects the melting of the particles 6 and 7. The molten mass is pressed into and around the primer 4 remaining in the ignitor cartridge 1, by the excess pressure produced by the heat of reaction. At these places the molten mass solidifies again very rapidly and forms a gas-tight seal for the opening produced by pulling the friction wire.
  • a friction ignitor comprising: a cartridge case having a friction end and a detonating end; a friction pull ignitor element partially inside of said cartridge case and extending through the friction end of said cartridge case; a primer charge within said cartridge case adjacent and to be frictionally ignited by said pull ignitor; a
  • non-ignitable means having a melting temperature substantially lower than the burning temperature of said primer charge and said detonating charge to at least partially melt and flow under the infiuence of the temperature and pressure of the burning detonating charge for sealing the friction end of said cartridge case.
  • thermoplastic synthetic material is polytetrafiuoroethylene.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Resistance Heating (AREA)
  • Frying-Pans Or Fryers (AREA)
US587482A 1965-10-28 1966-10-18 Friction ignitor Expired - Lifetime US3416450A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED0048534 1965-10-28

Publications (1)

Publication Number Publication Date
US3416450A true US3416450A (en) 1968-12-17

Family

ID=7051240

Family Applications (1)

Application Number Title Priority Date Filing Date
US587482A Expired - Lifetime US3416450A (en) 1965-10-28 1966-10-18 Friction ignitor

Country Status (8)

Country Link
US (1) US3416450A (de)
AT (1) AT262861B (de)
BE (1) BE689023A (de)
DE (1) DE1250319B (de)
ES (1) ES332756A1 (de)
GB (1) GB1112988A (de)
LU (1) LU52156A1 (de)
NL (1) NL6613624A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5313888A (en) * 1992-05-05 1994-05-24 Martin Brian D Pull-wire igniter for flares
US10436561B2 (en) * 2016-03-03 2019-10-08 3Rd Light Limited Fuse assembly for a munition

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU194597U1 (ru) * 2019-04-23 2019-12-17 Глеб Владимирович Локшин Средство инициирования воспламенения

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US379147A (en) * 1888-03-06 Friction-primer for blasting
US3000311A (en) * 1956-11-06 1961-09-19 Standard Oil Co Igniter for rocket propellant
US3060854A (en) * 1959-12-21 1962-10-30 Perma Pier Inc Underwater rocket
CA671286A (en) * 1963-10-01 M. Lovold Kjell Blank grenade with pull-igniter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US379147A (en) * 1888-03-06 Friction-primer for blasting
CA671286A (en) * 1963-10-01 M. Lovold Kjell Blank grenade with pull-igniter
US3000311A (en) * 1956-11-06 1961-09-19 Standard Oil Co Igniter for rocket propellant
US3060854A (en) * 1959-12-21 1962-10-30 Perma Pier Inc Underwater rocket

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5313888A (en) * 1992-05-05 1994-05-24 Martin Brian D Pull-wire igniter for flares
US10436561B2 (en) * 2016-03-03 2019-10-08 3Rd Light Limited Fuse assembly for a munition

Also Published As

Publication number Publication date
GB1112988A (en) 1968-05-08
BE689023A (de) 1967-03-31
DE1250319B (de)
NL6613624A (de) 1967-05-02
AT262861B (de) 1968-06-25
LU52156A1 (de) 1966-12-12
ES332756A1 (es) 1967-07-16

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