US3702090A - Sheet igniter - Google Patents

Sheet igniter Download PDF

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Publication number
US3702090A
US3702090A US433534A US3702090DA US3702090A US 3702090 A US3702090 A US 3702090A US 433534 A US433534 A US 433534A US 3702090D A US3702090D A US 3702090DA US 3702090 A US3702090 A US 3702090A
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Prior art keywords
block
rear surface
rocket
pyrotechnic
layer
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Expired - Lifetime
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US433534A
Inventor
Charles T Hoard
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BAE Systems Integrated Defense Solutions Inc
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MBAssociates Corp
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Assigned to TRACOR MBA, A CORP. OF CA reassignment TRACOR MBA, A CORP. OF CA CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). SEPTEMBER 1, 1983, CA. Assignors: MB ASSOCIATES, A CORP. OF CA.
Assigned to TRACOR AEROSPACE, INC., A CORP. OF TX. reassignment TRACOR AEROSPACE, INC., A CORP. OF TX. MERGER (SEE DOCUMENT FOR DETAILS). DECEMBER 22, 1986, TX. Assignors: TRACOR MBA, A CORP. OF CA. (MERGED INTO)
Anticipated expiration legal-status Critical
Assigned to BANK OF AMERICA NATIONAL TRUST AND SAVINGS ASSOCIATION, reassignment BANK OF AMERICA NATIONAL TRUST AND SAVINGS ASSOCIATION, SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TRACOR HOLDINGS, INC., TRACOR, INC., AND OTHERS INDICATED ON SCHEDULE SA
Assigned to CONTINENTAL BANK N.A. reassignment CONTINENTAL BANK N.A. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TRACOR AEROSPACE, INC.
Assigned to TRACOR AEROSPACE, INC. A DE CORPORATION reassignment TRACOR AEROSPACE, INC. A DE CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: OTC TRACOR AEROSPACE, INC., A TX CORPORATION
Assigned to OTC TRACOR AEROSPACE, INC. reassignment OTC TRACOR AEROSPACE, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE ON 12/09/1991 Assignors: TRACOR AEROSPACE, INC.
Assigned to TRACOR, INC. reassignment TRACOR, INC. RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: BANK OF AMERICA NATIONAL TRUST AND SAVINGS ASSOCIATION
Assigned to TRACOR AEROSPACE, INC. reassignment TRACOR AEROSPACE, INC. RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: CONTINENTAL BANK N.A.
Assigned to BANKERS TRUST COMPANY reassignment BANKERS TRUST COMPANY SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TRACOR AEROSPACE, INC.
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41F—APPARATUS FOR LAUNCHING PROJECTILES OR MISSILES FROM BARRELS, e.g. CANNONS; LAUNCHERS FOR ROCKETS OR TORPEDOES; HARPOON GUNS
    • F41F3/00—Rocket or torpedo launchers
    • F41F3/04—Rocket or torpedo launchers for rockets
    • F41F3/042—Rocket or torpedo launchers for rockets the launching apparatus being used also as a transport container for the rocket

Definitions

  • This invention relates to a method and apparatus for securing and igniting a plurality of miniature rockets.
  • the miniature rockets to which this invention relates are extremely small in size wherein the rocket has a diameter of about 1/10 inch and a length of 1% inches.
  • ignition is accomplished by means of a defiagrating fuse extending to the rear through the nozzle throat.
  • Such miniature rockets are fired in salvos consisting of large numbers of individual rockets, for example, 100, 1,000, 10,000 or more simultaneously. It is obvious that for practical use the ignition method must be frugal of material, provide substantially simultaneous ignition of each rocket and be simple to assemble to a large number of individual rockets.
  • a method for substantially simultaneous ignition has been devised, suitable for large numbers of miniature rockets supported in a flat or curved array so that their nozzles occupy points on a plane or curved surface. Further, said apparatus for ignition may also provide means for securing the miniature rockets for transportation and handling until the instant of ignition.
  • a thin sheet material such as plastic or metal foil
  • a pyrotechnic which upon ignition at any point conducts flame with great rapidity over the whole of the coated surface.
  • a second thin sheet may be added to confine the pyro-technic coating between the two and it is well known to the art that increases in burning rate result upon confinement of a pyrotechnic.
  • Suitable sheet materials include polyethylene film, mylar film, nitrocellulose film and magnesium, aluminum or copper foil.
  • Suitable pyrotechnic compositions include Sb S and Ba(NO boron and KNO aluminum and KClO lead and mononitroresorcinate and KCIO mixed with a small amount of binder of plastic or nitrocellulose. Said binder may be added in sufficient percentage to provide a sticky mass with solvent (such as acetone, methyl ethyl ketone, or methyl isobutyl ketone), and to yield a firm cement-like material upon drying. It is this cement-like property of the pyrotechnic composition that may be utilized to attach the miniature rockets to their support until the instant of ignition.
  • solvent such as acetone, methyl ethyl ketone, or methyl isobutyl ketone
  • FIG. 1 is a perspective view of a launching device embodying the present invention, with certain parts cut away;
  • FIG. 2 is an enlarged partial sectional view through a rocket chamber in a launching device
  • FIG. 3 is an enlarged perspective view of an ignition sheet.
  • a launching device generally designated 3, which can be made of a suitable construction material such as a foam plastic 5.
  • the device has a series of channels 7 therin, each of which is adapted to receive a miniature rocket 9.
  • a sheet of plastic film or metal foil 1 l is placed over the open channels of the launching device 3, and the miniature rockets 9 are then inserted into the channels 7 by passing them through the sheet 11. This leaves the aft end of the rocket flush with the sheet 11 with the fuse 13 of the rocket bent over and lying substantially parallel to the sheet 11.
  • the sheet 1 l is then coated with a pyrotechnic mixture 15 as has been heretofore described.
  • This coating accomplishes intimate contact with each of the fuses l3 and also cements the aft ends of the miniature rockets 9 to the sheet 11.
  • a cover sheet 17 is then placed over the pyrotechnic mixture 15, which sheet can be the same or different from the sheet 11.
  • the sheet 11 might be a foil while the sheet 17 is a plastic, or vice versa, or both sheets might be foil or both sheets might be plastic.
  • Sheet 17 confines the pyrotechnic, which serves to increase its burning rate and also serves to protect the pyrotechnic from exposure until use.
  • a master fuse 19 is provided which passes into the pyrotechnic layer 15 and which extends to an igniter 21.
  • the sheet 1 1 may in some configurations be omitted and the pyrotechnic 15 coated directly upon the block 5, the aft end of the miniature rockets 9 and the fuse ends 13. Further, with fast burning pyrotechnics and a small number of miniature rockets in the array, sheet 17 may be omitted, the pyrotechnic being applied without a confining cover sheet and yet accomplishing substantially simultaneous ignition. It is also obvious that the block 5 need not be flat on the entry or exit faces but may acquire curved surfaces whereby the rocket array may be made to fit cylindrical, spherical or other curved envelopes.
  • a holding, launching and ignition device for a plurality of miniature rockets comprising in combination:
  • a miniature rocket having a nozzle at the aft end thereof in each of said holes;
  • each nozzle being substantially flush with the rear surface of the block;
  • said pyrotechnic layer encompassing all of the rocket fuses
  • h. means for igniting the pyrotechnic layer.
  • a holding, launching and ignition device for a plurality of miniature rockets comprising in combination:
  • a thin pyrotechnic layer spread over substantially the entire rear surface of the layer; h. said pyrotechnic layer encompassing all of the rocket fuses; and i. means for igniting the pyrotechnic layer.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Toys (AREA)

Abstract

1. A holding, launching and ignition device for a plurality of miniature rockets comprising in combination: A. A BLOCK OF FOAM PLASTIC; B. A PLURALITY OF HOLES THROUGH SAID PLASTIC, SAID HOLES EXTENDING FROM A FRONT SURFACE TO A REAR SURFACE OF THE BLOCK; C. A MINIATURE ROCKET HAVING A NOZZLE AT THE AFT END THEREOF IN EACH OF SAID HOLES; D. THE AFT END OF EACH NOZZLE BEING SUBSTANTIALLY FLUSH WITH THE REAR SURFACE OF THE BLOCK; E. A FUSE EXTENDING FROM EACH OF THE ROCKET NOZZLES AND BENT TO LIE FLUSH ON THE SURFACE OF THE BLOCK; F. A THIN PYROTECHNIC LAYER SPREAD OVER SUBSTANTIALLY THE ENTIRE REAR SURFACE OF THE BLOCK; G. SAID PYROTECHNIC LAYER ENCOMPASSING ALL OF THE ROCKET FUSES; AND H. MEANS FOR IGNITING THE PYROTECHNIC LAYER.

Description

I United States Patent 1151 3,702,090
Hoard 1451 Nov. 7, 1972 [54] SHEET IGNITER FOREIGN PATENTS OR APPLICATIONS Inventor: C a s ard, a a d. Calif- 578,034 6/1959 Canada.....................89/l.7 B
[73] Assigneez MB Associates, San Ramon, Cal1f. Primary Examiner samuel w. Engle [22] Filed: Feb. 5, 1965 21 Appl. No.: 433,534 EXEMPLARY CLAIM l. A holding, launching and ignition device for a plu- Related Appl'catmn Data rality of miniature rockets comprising in combination: [63] Continuation of Ser. No. 103,289, April 17, a block of foam p 19 1, abandone b. a plurality of holes through said plastic, said holes 7 extending from a front surface to a rear surface of [52] us. Cl..................................89/1.813, 89/l.816 the y q 51] Int. Cl. 3/04 a mmlamre rocket havmg a nozzle at the aft end [58] Field of Search..............102/49; 206/3; 89/17 B thereof each of Sald holes;
d. the aft end of each nozzle bemg substantlally [56] References Cited flush with the rear surface of the block;
e. a fuse extending from each of the rocket nozzles UNITED STATES PATENTS and bent to lie flush on the surface of the block;
1. a thin pyrotechnic layer spread over substantially the entire rear surface of the block; g. said pyrotechnic layer encompassing all of the 102/34 rocket fuses; and Re et a1 g h. means for igniting the pyrotechnic layer. Loedding.....................102/49 3 Claims, 3 Drawing Figures 24,468 6/1859 Lanergan.....................102/34 956,546 5/1910 Schulman....................102/33 2,043,268 6/1936 Skinner 2,792,962 5/1957 Granfelt................... 2,844,073 7/1958 2,853,946 9/1958 SHEET IGNITER This application is a continuation of my copending application Ser. No. 103,289, filed Apr. 17, 1961, now abandoned, and entitled Sheet Igniter.
This invention relates to a method and apparatus for securing and igniting a plurality of miniature rockets.
Large rockets are fired singly with individual ignition systems; in situations requiring more than one simultaneous firing, the large scale of said ignition systems permits parallel connection easily. Further, it is not difficult to provide integral attachment points to hold large rockets securely for transportation and handling and the release mechanism may be complex without adding excessive cost relative to the value of the rocket. The miniature rockets to which this invention relates are extremely small in size wherein the rocket has a diameter of about 1/10 inch and a length of 1% inches. Ordinarily, ignition is accomplished by means of a defiagrating fuse extending to the rear through the nozzle throat. Such miniature rockets are fired in salvos consisting of large numbers of individual rockets, for example, 100, 1,000, 10,000 or more simultaneously. It is obvious that for practical use the ignition method must be frugal of material, provide substantially simultaneous ignition of each rocket and be simple to assemble to a large number of individual rockets.
A method for substantially simultaneous ignition has been devised, suitable for large numbers of miniature rockets supported in a flat or curved array so that their nozzles occupy points on a plane or curved surface. Further, said apparatus for ignition may also provide means for securing the miniature rockets for transportation and handling until the instant of ignition.
It has been found by experiment that a thin sheet material, such as plastic or metal foil, may be coated with a pyrotechnic, which upon ignition at any point conducts flame with great rapidity over the whole of the coated surface. Further, a second thin sheet may be added to confine the pyro-technic coating between the two and it is well known to the art that increases in burning rate result upon confinement of a pyrotechnic.
Suitable sheet materials include polyethylene film, mylar film, nitrocellulose film and magnesium, aluminum or copper foil. Suitable pyrotechnic compositions include Sb S and Ba(NO boron and KNO aluminum and KClO lead and mononitroresorcinate and KCIO mixed with a small amount of binder of plastic or nitrocellulose. Said binder may be added in sufficient percentage to provide a sticky mass with solvent (such as acetone, methyl ethyl ketone, or methyl isobutyl ketone), and to yield a firm cement-like material upon drying. It is this cement-like property of the pyrotechnic composition that may be utilized to attach the miniature rockets to their support until the instant of ignition.
In the drawings forming part of this application:
FIG. 1 is a perspective view of a launching device embodying the present invention, with certain parts cut away;
FIG. 2 is an enlarged partial sectional view through a rocket chamber in a launching device; and
FIG. 3 is an enlarged perspective view of an ignition sheet.
Turning now to a description of the drawing by reference characters, there is shown a launching device, generally designated 3, which can be made of a suitable construction material such as a foam plastic 5. The device has a series of channels 7 therin, each of which is adapted to receive a miniature rocket 9. in carrying out the present invention, in accordance with one embodiment, a sheet of plastic film or metal foil 1 l is placed over the open channels of the launching device 3, and the miniature rockets 9 are then inserted into the channels 7 by passing them through the sheet 11. This leaves the aft end of the rocket flush with the sheet 11 with the fuse 13 of the rocket bent over and lying substantially parallel to the sheet 11. The sheet 1 l is then coated with a pyrotechnic mixture 15 as has been heretofore described. This coating accomplishes intimate contact with each of the fuses l3 and also cements the aft ends of the miniature rockets 9 to the sheet 11. A cover sheet 17 is then placed over the pyrotechnic mixture 15, which sheet can be the same or different from the sheet 11. The sheet 11 might be a foil while the sheet 17 is a plastic, or vice versa, or both sheets might be foil or both sheets might be plastic. Sheet 17 confines the pyrotechnic, which serves to increase its burning rate and also serves to protect the pyrotechnic from exposure until use. A master fuse 19 is provided which passes into the pyrotechnic layer 15 and which extends to an igniter 21.
It is obvious that the sheet 1 1 may in some configurations be omitted and the pyrotechnic 15 coated directly upon the block 5, the aft end of the miniature rockets 9 and the fuse ends 13. Further, with fast burning pyrotechnics and a small number of miniature rockets in the array, sheet 17 may be omitted, the pyrotechnic being applied without a confining cover sheet and yet accomplishing substantially simultaneous ignition. It is also obvious that the block 5 need not be flat on the entry or exit faces but may acquire curved surfaces whereby the rocket array may be made to fit cylindrical, spherical or other curved envelopes.
I claim:
1. A holding, launching and ignition device for a plurality of miniature rockets comprising in combination:
a. a block of foam plastic;
b. a plurality of holes through said plastic, said holes extending from a front surface to a rear surface of the block;
c. a miniature rocket having a nozzle at the aft end thereof in each of said holes;
d. the aft end of each nozzle being substantially flush with the rear surface of the block;
e. a fuse extending from each of the rocket nozzles and bent to lie flush on the surface of the block;
f. a thin pyrotechnic layer spread over substantially the entire rear surface of the block;
g. said pyrotechnic layer encompassing all of the rocket fuses; and
h. means for igniting the pyrotechnic layer.
2. The device of claim 1, wherein a sheet of thin material is applied over the pyrotechnic layer.
3. A holding, launching and ignition device for a plurality of miniature rockets comprising in combination:
a. a block of foam plastic;
b. a plurality of holes through said plastic, said holes extending from a front surface to a rear surface of the block;
c. a layer including front and rear surfaces secured to the rear surface of sad block;
g. a thin pyrotechnic layer spread over substantially the entire rear surface of the layer; h. said pyrotechnic layer encompassing all of the rocket fuses; and i. means for igniting the pyrotechnic layer.
III I II I!

Claims (3)

1. A HOLDING, LAUNCHING AND IGNITION DEVICE FOR A PLURALITY OF MINIATURE ROCKETS COMPRISING IN COMBINATION: A. A BLOCK OF FOAM PLASTIC; B. A PLURALITY OF HOLES THROUGH SAID PLASTIC, SAID HOLES EXTENDING FROM A FRONT SURFACE TO A REAR SURFACE OF THE BLOCK; C. A MINIATURE ROCKET HAVING A NOZZLE AT THE AFT END THEREOF IN EACH OF SAID HOLES; D. THE AFT END OF EACH NOZZLE BEING SUBSTANTIALLY FLUSH WITH THE REAR SURFACE OF THE BLOCK; E. A FUSE EXTENDING FROM EACH OF THE ROCKET NOZZLES AND BENT TO LIE FLUSH ON THE SURFACE OF THE BLOCK; F. A THIN PYROTECHNIC LAYER SPREAD OVER SUBSTANTIALLY THE ENTIRE REAR SURFACE OF THE BLOCK; G. SAID PYROTECHNIC LAYER ENCOMPASSING ALL OF THE ROCKET FUSES; AND H. MEANS FOR IGNITING THE PYROTECHNIC LAYER.
2. The device of claim 1, wherein a sheet of thin material is applied over the pyrotechnic layer.
3. A holding, launching and ignition device for a plurality of miniature rockets comprising in combination: a. a block of foam plastic; b. a plurality of holes through said plastic, said holes extending from a front surface to a rear surface of the block; c. a layer including front and rear surFaces secured to the rear surface of sad block; d. a miniature rocket having a nozzle at the aft end thereof in each of said holes; e. the aft end of each nozzle being substantially flush with the rear surface of the layer; f. a fuse extending from each of the rocket nozzles and bent to lie flush on the rear surface of the layer; g. a thin pyrotechnic layer spread over substantially the entire rear surface of the layer; h. said pyrotechnic layer encompassing all of the rocket fuses; and i. means for igniting the pyrotechnic layer.
US433534A 1965-02-05 1965-02-05 Sheet igniter Expired - Lifetime US3702090A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3807275A (en) * 1972-10-06 1974-04-30 Us Army Miniature missile system
US4012985A (en) * 1974-02-27 1977-03-22 Arnold Ingemar Magnusson Multiple launcher
US4296669A (en) * 1979-05-25 1981-10-27 The United States Of America As Represented By The Secretary Of The Army Rocket tube launcher with cast-in place tube support bulkhead
US6484555B1 (en) * 1999-11-19 2002-11-26 Siemens Canada Limited Method of calibrating an integrated pressure management apparatus

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US24468A (en) * 1859-06-21 Improvement in exhi bition
US956546A (en) * 1906-12-22 1910-05-03 American Fire Cracker Mfg Company Pyrotechnics.
US2043268A (en) * 1934-09-11 1936-06-09 Leslie A Skinner Rocket
US2792962A (en) * 1955-10-21 1957-05-21 Ernest H Granfelt Multi-cellular rocket package
US2844073A (en) * 1954-04-16 1958-07-22 Royal Industries Launching device
US2853946A (en) * 1954-01-26 1958-09-30 Unexcelled Chemical Corp Rockets
CA578034A (en) * 1959-06-23 J. Hodgson Dennis Missile projector

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US24468A (en) * 1859-06-21 Improvement in exhi bition
CA578034A (en) * 1959-06-23 J. Hodgson Dennis Missile projector
US956546A (en) * 1906-12-22 1910-05-03 American Fire Cracker Mfg Company Pyrotechnics.
US2043268A (en) * 1934-09-11 1936-06-09 Leslie A Skinner Rocket
US2853946A (en) * 1954-01-26 1958-09-30 Unexcelled Chemical Corp Rockets
US2844073A (en) * 1954-04-16 1958-07-22 Royal Industries Launching device
US2792962A (en) * 1955-10-21 1957-05-21 Ernest H Granfelt Multi-cellular rocket package

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3807275A (en) * 1972-10-06 1974-04-30 Us Army Miniature missile system
US4012985A (en) * 1974-02-27 1977-03-22 Arnold Ingemar Magnusson Multiple launcher
US4296669A (en) * 1979-05-25 1981-10-27 The United States Of America As Represented By The Secretary Of The Army Rocket tube launcher with cast-in place tube support bulkhead
US6484555B1 (en) * 1999-11-19 2002-11-26 Siemens Canada Limited Method of calibrating an integrated pressure management apparatus

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