Ammunition and explosives – Smoke generating
Patent
1992-06-09
1994-08-16
Brown, David H.
Ammunition and explosives
Smoke generating
102368, F42B 1248
Patent
active
053376714
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an arrangement in a smoke shell which generates smoke in both the visible and/or IR range and/or millimeter range.
BACKGROUND OF THE INVENTION
Modern weapon systems utilize today the infrared (IR) part of the electromagnetic spectrum in addition to the visible spectrum. Especially the weapon systems which have been developed to defeat armoured fighting vehicles, comprise sighting devices operating in the infrared spectrum, which means that hostile objects can be observed and aimed at as well in daylight as in the dark.
Further, modern weapon systems utilize the millimeter band of the electromagnetic spectrum, for example in the range of 35-94 GHz, for observation, homing and destroying hostile objects.
PRIOR ART
What the prior art gives instructions for, for example as discussed in Norwegian patent application 83.3740, is that for dissemination of copper powder there must be used a separate bursting charge, i.e. a further bursting charge in addition to the charge which ignites the smoke elements.
Besides, the prior art according to Norwegian patent application 83.3740 gives instructions for smoke shells having an axial configuration, which includes a first chamber comprising smoke elements, and a second chamber comprising copper powder, said two chambers being arranged one after the other in the axial direction, and without the smoke elements and copper powder mutually influencing each other for coordinated dissemination of smoke in the visible band and the IR band or the millimeter band.
Also according to Norwegian patent application 88.1063 there is suggested on the one hand smoke generators generating visible smoke, and on the other hand a container including powder and having its own bursting charge or explosive rod. That the two types of smoke should operate separately from each other, is also obvious from this publication, since it is suggested that the two containers including smoke generating, pyrotechnical mixture are separated from the powder mixture by letting a device which initially connects the two different chambers, burst, for example by the breaking of a rod.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a smoke system giving rapid protection over a large physical area, not only in the visible band, but also in the infrared and/or millimeter band of the electromagnetic spectrum.
According to the invention this is achieved in an arrangement in a smoke shell of the type as mentioned in the preamble, which is characterized in that the arrangement comprises a first inner container housing pyrotechnical instantaneous smoke elements associated with an ignition charge, as well as a second container arranged substantially radially in relation to the first container and being without an ignition charge, and housing means for smoke in the IR and/or millimeter band, such that the reaction of the pyrotechnical instantaneous smoke elements upon ignition of said smoke shell provides a large enough pressure for bursting also the outer container for thereby disseminating the instantaneous smoke elements over a smoke screening area together with the means for providing smoke screening in the IR band and/or millimeter band.
What is novel and characterizing in the present invention, thus appears in the replacement of the bursting charge for IR and millimeter smoke with the pyrotechnical charge itself which develops instantaneous smoke, and which contributes directly to the dissemination of IR and millimeter smoke, the pyrotechnical instantaneous smoke elements upon ignition of the smoke shell rendering sufficient pressure for disseminating themselves and thereby the enclosing powder of said types of smoke.
Further advantages and features of the present invention will appear from the following description and the appended patent claims.
BRIEF DISCLOSURE OF THE DRAWINGS
FIG. 1 is a side view partly in section of a first embodiment of an arrangement in a smoke shell according to the present invention.
FIG. 2 is a se
REFERENCES:
patent: 4353301 (1982-10-01), Jacobsen
patent: 4436034 (1984-03-01), Jacobson et al.
patent: 4474715 (1984-10-01), Weber et al.
patent: 4726295 (1988-02-01), Embury et al.
Brown David H.
Raufoss AS
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