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US3750577A - Projectile carried ignitable device having delayed, large surface ignition - Google Patents

Projectile carried ignitable device having delayed, large surface ignition Download PDF

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Publication number
US3750577A
US3750577A US00258168A US3750577DA US3750577A US 3750577 A US3750577 A US 3750577A US 00258168 A US00258168 A US 00258168A US 3750577D A US3750577D A US 3750577DA US 3750577 A US3750577 A US 3750577A
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US
United States
Prior art keywords
charge
cover member
gap
opening
hot gases
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
US00258168A
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English (en)
Inventor
B Simmons
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.)
Saab Bofors AB
Original Assignee
Bofors AB
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 Bofors AB filed Critical Bofors AB
Application granted granted Critical
Publication of US3750577A publication Critical patent/US3750577A/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
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C19/00—Details of fuzes
    • F42C19/08—Primers; Detonators
    • F42C19/09—Primers or detonators containing a hollow charge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02K—JET-PROPULSION PLANTS
    • F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
    • F02K9/95—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof characterised by starting or ignition means or arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B4/00—Fireworks, i.e. pyrotechnic devices for amusement, display, illumination or signal purposes
    • F42B4/26—Flares; Torches
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B5/00—Cartridge ammunition, e.g. separately-loaded propellant charges
    • F42B5/02—Cartridges, i.e. cases with charge and missile
    • F42B5/16—Cartridges, i.e. cases with charge and missile characterised by composition or physical dimensions or form of propellant charge, with or without projectile, or powder

Definitions

  • a further member temporarily covers said plurality of [56] References Cited flare outlet openings, said further member being re- UNITED STATES PATENTS moved to expose said outlet openings upon sudden de- 2,120,246 6/1938 Fischer 102 341 celeratim the flare or due to hot gases Produced by 2,442,528 6 1948 Beattle ignition 0f Said flare surface- 2,503,269 4/1950 Hickman 102 34.4 X 3,038,407 6/1962 Robertson et al.
  • the present invention relates to a device for use in conjunction with a priming charge in a carrier part in the form of a projectile, rocket or the like, which causes the priming charge to ignite a main charge be longing to the carrier part over a relatively large surface momentarily, and which comprises a member covering said surface via a gap-formed space.
  • the covering member has an opening leading to said space, and containing the priming charge, and said member, also defines one or several outlet openings leading from said space, the priming charge beingggnited by the hot gases directed towards said openings.
  • Devices of this kind are utilized, inter alia, for illuminating shells which have a pyrotechnical flare carried in a parachute enclosed within a projectile.
  • This flare together with the parachute, form part of a unit that can be expelled from the projectile, from which the flare is separated after the unit has been braked down with a brake parachute and a rotation brake.
  • ignition of the flare takes place over one of its end surfaces, which then corresponds to the above-mentioned surface, which ignition takes place by means of the device according to the Swedish Pat. No. 197,826.
  • the present invention which is a further development of the invention described in the aforementioned Swedish patent, is primarily intended to solve these problems.
  • the feature that can mainly be considered to characterize a device according to the present invention is that it has a means for delaying the initiation of the priming charge, appropriatelyin the form of a delay charge applied to the priming charge and/or that the priming charge is arranged to ignite the main charge only after a certain time has passed, and that it is also provided with a part covering said outlet openings, which part prevents the hot gases from igniting the main charge via the outlet openings.
  • FIG. 1 in a vertical view, shows a first embodiment of the device applied to a flare (main charge)
  • FIG. 2 in a vertical view shows a second embodiment of the device applied to flare.
  • the reference designation 2 shows a flare enclosed in a casing 1, which flare has an end surface 3 extending at right angles to the plane of the figure.
  • the device also comprises a member 5 covering the end surface 3 via a gap-formed space 4, and the gapformed space is obtained by means of a spacing ring 6 placed on the end surface 3.
  • The: covering member 5 is provided with a protruding part 7, facing in the direction away from the surface 3, and which is provided with a cavity facing towards the surface 3, in which a priming charge 8 of the so-called powder pellet type is applied, as well as an opening 9 leading to the gapformed space 4.
  • the covering member 5 is also provided with one or several outlet openings 10, which in the example of the embodiment consist of several openings which together form a circle of holes, and of which two are shown in the figure.
  • the casing I has tumed-in section Ila, which keeps the covering member 5 in place.
  • the device according to the invention also has a part III covering said outlet openings, in the form of a disc which has a. hole in its center, through which the protruding part 7 extends. The periphery of the part 11 is in contact with the turned-in section la.
  • the purpose of the covering part III is to prevent ignition of the flare 2 directed toward opening 10, from the rear by hot gases, the direction of which gases is indicated with arrows A.
  • the hot gases come from an expelling charge not shown, which expels a container also not shown, which at an earlier stage of the functioning of the device had enclosed the flare from the protruding part 7 and along the envelope surface of the casing I.
  • Said hot gases instead of impinging on flare surface 3 via openings 10, ignite the priming charge 8 via the opening 9 leading to the gap-formed space 4.
  • the priming charge 8, at its two opposite end surfaces which face the direction from which the hot gases come and said surface 3, respectively, is provided with two recesses located opposite each other via an intermediate layer 8a.
  • the priming charge After the inititation of the priming charge from the hot gases, when said layer 8a has been burned through, the priming charge, through its formed hole, will produce a flame which is spread over the surface 3 towards the outlet openings 110.
  • the covering disc III is then arranged in such a way that, in order to uncover the outlet openings 10, it falls off due to the sudden braking of the flare achieved by the parachute when this is opened. It is advisable, as :shown in FIG. II, to make the protruding part 7 with sloping sides, so that the part 11 can easily be separated from the flare.
  • the covering partlll has been removed, the device itself will function in a previously known way.
  • FIG. 2 shows an alternative embodiment, in which the protruding part7 is designed so that, in addition to the priming charge 8', it can contain a delay charge 12, which is then fitted in said opening 9.
  • the delay charge is of a conventional kind used in applications such as these, and comprises an ignition composition, a delay pellet and a relay pellet (see the different sectioning in the figure).
  • the priming charge 8 as in the case of hitherto known devices, has a through hole 811. Consequently, the hot gases will first ignite the delay charge 112, which, after a certain time during which it burns through, will ignite the priming charge 8' which, as described above, achieves the flame for igniting the surface 3 of the main charge 2'.
  • the invention is not limited to the embodiments shown above as examples, but can be subject to modifications within the scope of the following claims.
  • the invention is not limited to the type of pyrotechnical illuminating projectiles shown, nor to pyrotechnical flares, but can also be utilized in other cases when, for some reason or other, there is a desire to obtain a delay of the momentary ignition.
  • the covering part 11, 11 need not consist of a disc, but can consist of e.g. a thin layer of suitable material applied to the covering member 5, which layer can be destroyed by the hot gases without the main charge being ignited.
  • the covering part 11, 11 can also be arranged to resist gases coming from the directions A, A on the outside, but to give way when subjected to gases which come from the space 4, 4.
  • an ignitable unit comprising a main charge adapted to be mounted within a projectile and adapted to be expelled from said projectile by hot gases generated by an expelling charge in said projectile and directed toward a surface of said main charge
  • delay means are provided for preventing ignition of said expelled main charge by said hot gases for a predetermined time interval
  • said delay means including a first cover member covering said main charge surface, said first cover member being disposed in spaced relation to said surface to define a gap between said first cover member and surface and having at least one outlet opening extending through said first cover member in communication with said gap, a removable second cover member adjacent said first cover member in overlying relation to said outlet opening for temporarily covering said outlet opening thereby to prevent said main charge from being ignited by said hot gases via said outer opening, said second cover member being adapted to be removed after said main charge has been expelled, a further opening in said first cover member, and a further charge in said further opening, said further charge having one portion thereof exposed via said further opening to said hot gases for ignition
  • said unit comprises a pyrotechnic device adapted to be expelled, along with an associated parachute, from said projectile, said predetermined time interval being sufficiently long to permit said parachute to open before said main charge is ignited thereby to prevent burning of said parachute by said ignited main charge, said second cover member being mounted for removal in response to deceleration of said main charge upon opening of said parachute.
  • said further charge comprises a priming charge having a first recess in one surface thereof at said one portion of said charge, a second recess in a second surface thereof at said opposing portion of said charge, and a solid charge layer between said first and second recesses adapted, upon ignition of said one portion, to be burned through from said first recess to said second recess to produce a through hole in said'priming charge which communicates with said gap.
  • said further charge comprises a solid delay charge having a portion thereof exposed through said further opening to said hot gases, and a priming charge disposed between said delay charge and said gap, said priming charge having a through hole extending from said delay charge to said gap.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Toys (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US00258168A 1971-06-21 1972-05-31 Projectile carried ignitable device having delayed, large surface ignition Expired - Lifetime US3750577A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7108002A SE372624B (xx) 1971-06-21 1971-06-21

Publications (1)

Publication Number Publication Date
US3750577A true US3750577A (en) 1973-08-07

Family

ID=20272863

Family Applications (1)

Application Number Title Priority Date Filing Date
US00258168A Expired - Lifetime US3750577A (en) 1971-06-21 1972-05-31 Projectile carried ignitable device having delayed, large surface ignition

Country Status (8)

Country Link
US (1) US3750577A (xx)
DE (1) DE2229854C3 (xx)
FR (1) FR2143066B1 (xx)
GB (1) GB1379963A (xx)
IL (1) IL39476A (xx)
IT (1) IT958212B (xx)
NL (1) NL7208394A (xx)
SE (1) SE372624B (xx)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE398109B (sv) * 1975-05-23 1977-12-05 Bofors Ab Anordning vid en pyroteknisk lyssats
IT1170694B (it) * 1981-02-04 1987-06-03 Simmel Spa Dispositivo di accensione per cariche illuminanti
FR2606134B1 (fr) * 1986-10-31 1990-08-24 Thomson Brandt Armements Procede de realisation d'un chargement explosif a conformation d'onde et chargement explosif realise par ledit procede

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2120246A (en) * 1935-11-27 1938-06-14 Max W Fischer Pyrotechnic device
US2442528A (en) * 1943-11-20 1948-06-01 Aerial Products Inc Rocket device
US2503269A (en) * 1944-06-01 1950-04-11 Clarence N Hickman Rocket propelled illuminating flare
US3038407A (en) * 1951-07-02 1962-06-12 Anthony E Robertson Drag operated parachute release mechanism
US3105438A (en) * 1959-11-25 1963-10-01 Gotex Ab Rocket devices
US3426683A (en) * 1966-07-20 1969-02-11 Oerlikon Buehrle Holding Ag Star shell

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2120246A (en) * 1935-11-27 1938-06-14 Max W Fischer Pyrotechnic device
US2442528A (en) * 1943-11-20 1948-06-01 Aerial Products Inc Rocket device
US2503269A (en) * 1944-06-01 1950-04-11 Clarence N Hickman Rocket propelled illuminating flare
US3038407A (en) * 1951-07-02 1962-06-12 Anthony E Robertson Drag operated parachute release mechanism
US3105438A (en) * 1959-11-25 1963-10-01 Gotex Ab Rocket devices
US3426683A (en) * 1966-07-20 1969-02-11 Oerlikon Buehrle Holding Ag Star shell

Also Published As

Publication number Publication date
DE2229854C3 (de) 1978-04-20
SE372624B (xx) 1974-12-23
NL7208394A (xx) 1972-12-27
FR2143066B1 (xx) 1973-07-13
IL39476A0 (en) 1972-10-29
GB1379963A (en) 1975-01-08
FR2143066A1 (xx) 1973-02-02
IT958212B (it) 1973-10-20
DE2229854A1 (de) 1972-12-28
DE2229854B2 (de) 1977-09-01
IL39476A (en) 1976-07-30

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