US3416450A - Friction ignitor - Google Patents
Friction ignitor Download PDFInfo
- 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
Links
Images
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)
- Resistance Heating (AREA)
- Air Bags (AREA)
- Frying-Pans Or Fryers (AREA)
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 (zh) |
AT (1) | AT262861B (zh) |
BE (1) | BE689023A (zh) |
DE (1) | DE1250319B (zh) |
ES (1) | ES332756A1 (zh) |
GB (1) | GB1112988A (zh) |
LU (1) | LU52156A1 (zh) |
NL (1) | NL6613624A (zh) |
Cited By (2)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU194597U1 (ru) * | 2019-04-23 | 2019-12-17 | Глеб Владимирович Локшин | Средство инициирования воспламенения |
Citations (4)
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 |
-
0
- DE DENDAT1250319D patent/DE1250319B/de active Pending
-
1966
- 1966-09-27 NL NL6613624A patent/NL6613624A/xx unknown
- 1966-10-12 LU LU52156D patent/LU52156A1/xx unknown
- 1966-10-18 US US587482A patent/US3416450A/en not_active Expired - Lifetime
- 1966-10-26 ES ES0332756A patent/ES332756A1/es not_active Expired
- 1966-10-27 AT AT1000066A patent/AT262861B/de active
- 1966-10-28 GB GB48574/66A patent/GB1112988A/en not_active Expired
- 1966-10-28 BE BE689023D patent/BE689023A/xx unknown
Patent Citations (4)
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)
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 |
---|---|
LU52156A1 (zh) | 1966-12-12 |
DE1250319B (zh) | |
GB1112988A (en) | 1968-05-08 |
ES332756A1 (es) | 1967-07-16 |
BE689023A (zh) | 1967-03-31 |
NL6613624A (zh) | 1967-05-02 |
AT262861B (de) | 1968-06-25 |
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