Pyrotechnic device

• US 4,719,856 A
• Filed: 03/29/1982
• Issued: 01/19/1988
• Est. Priority Date: 04/01/1981
• Status: Expired due to Fees

• Current Assignee: Pains-Wessex Limited
• Original Assignee: Pains-Wessex Limited
• Inventors: Joslin, Nigel F.
• Primary Examiner(s): Lechert, Jr., Stephen J.
• Application Number:
  US06/376,385
• Time in Patent Office: 2,122 Days
• Field of Search: 102/335, 102/334, 102/356, 102/357, 102/505, 149/43, 149/72, 149/117, 149/73, 149/87, 149/3, 149/6
• US Class Current: 102/335
• CPC Class Codes: C06D 3/00 Generation of smoke or mist (chemical part) compositions used as biocides, pest repellants or attractants, or plant growth regulators A01N25/18
• CPC Class Codes: Y10S 149/117 Smoke or weather composition contains resin

Abstract

The pyrotechnic device comprises a projectile, a ground mounted device or a floating device whose casing contains a charge of titanium or other suitable combustible metal-containing material, charcoal, or other reducing agent and gunpowder such that, following ignition, infra-red emitting particles are emitted to form an infra-red radiating screen. The carbon reduces oxidation of the combustible material prior to emission.

Claims

1. A pyrotechnic device for use in screening a heat-emitting source from a heat-seeking or heat-detecting device, the pyrotechnic device containing a pyrotechnic composition which comprises a combustible particulate substance, a combustible propellant for, upon ignition, heating the particulate substance and expelling the particulate substance from the device to form a screen of hot particles having a substantial degree of radiation in the 3-14 micron wavelength band, by combustion, and means for inhibiting oxidation of the particulate substance within the device.

4. A pyrotechnic device according to claim 1 wherein the combustible particulate substance is selected from the group consisting of titanium metal, titanium alloys and compounds of titanium.

5. A pyrotechnic device according to claim 4 wherein the titanium metal is present in an amount of 20-60%.

8. A pyrotechnic device according to claim 1 wherein the composition is effective to cause pulsation of the amount of radiation in the said band.

9. A pyrotechnic device according to claim 1 comprising a container for said composition, the container having a nozzle through which the particulate substance is expelled, the nozzle being capable of producing pressure oscillation within the container to effect pulsation of the amount of radiation in the said band.

11. A pyrotechnic device according to claim 1 wherein certain particles of said composition are coated with a substance, such for example as fluorinated organic polymer, effective to retard the combustion of such coated particles prior to their expulsion from the device.

2. A pyrotechnic device for use in screening a heat-emitting source from a heat-seeking or heat-detecting device, the pyrotechnic device containing a pyrotechnic composition which comprises a combustible particulate substance, a combustible propellant for, upon ignition, heating the particulate substance and expelling the particulate substance from the device to form a screen of hot particles having a substantial degree of radiation in the 3-14 micron wavelength band, by combustion, and the composition as a whole being such that, upon combustion, oxygen deficient gases are formed within the device.

3. A pyrotechnic device for use in screening a heat-emittng source from a heat-seeking or heat-detecting device, the pyrotechnic device containing a pyrotechnic composition which comprises a combustible particulate substance, a propellant for, upon ignition, heating the particulate substance and expelling the particulate substance from the device to form a screen of hot particles havng a substantial degree of radiation in the 3-14 micron wavelength band, by combustion, and an oxygen-absorbing substance for delaying the oxidation of the particulate substance prior to its expulsion from the device.

6. A pyrotechnic device according to claim 3 wherein the oxygen-absorbing substance is charcoal.

7. A pyrotechnic device according to claim 6 wherein said charcoal is present in an amount of 10-20% of the pyrotechnic composition.

10. A pyrotechnic device containing a pyrotechnic composition which comprises 20-60% combustible titanium powder, 10-20% charcoal and the remainder being gunpowder and minor constituents if any.