Smoke canister with capillary bores

Ammunition and explosives – Smoke generating

Patent

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Details

102350, F42B 1344

Patent

active

047278110

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a smoke canister of the type which includes a casing to contain a smoke-generating charge and which includes a lid for the casing, the lid containing ignition and propellant charges and having a periphery with electrical contact rings.
Smoke canisters of the species described in more detail at the outset are known from German Laid-Open application DE-OS No. 15 78 348. Their main purpose is the self-protection of vehicles of every kind, especially combat tanks, and they are therefore carried on such vehicles and are fired from launchers externally attached to the vehicle. Customary launchers, distributed in large numbers, are designed for a maximum gas pressure of about 13.5 Bar, so that only a propellant charge mostly consisting of black powder (which generates a low gas pressure) can be used for the launching of smoke canisters. It would be desirable, because of the achievable increase in protection, to launch smoke canisters having a larger smoke-generating charge from the vehicles seeking protection. However, this is not easily possible with customary launchers because of their comparatively low resistance to pressure. Furthermore, the black powder propellant charges usually employed have the disadvantage that they foul the electrical contacts for the firing of the smoke canisters to a high degree.
Especially when it is impossible to clean immediately after the launching of the smoke canisters, heavy corrosion effects occur, leading to difficulties with the contacts and, at the least, making repeated launches of the smoke canisters more difficult.


SUMMARY OF THE INVENTION

It is an object of the invention to provide an improved smoke canister which makes assured self-protection possible at greater speed a with customary smoke canisters, and which avoids fouling of the contacts. Such fouling would impair the assurance of operation.
This object is attained, based on a smoke canister of the species described at the outset in more detail, by providing a container having first and second end faces and having a high-pressure proof propellant chamber between the end faces, the container being mounted in the lid with the first end face oriented toward the smoke-generating charge, the first end face having a capillary bore and the second end face having a single capillary bore, the diameter of the second capillary bore ranging from about 1 mm to about 1.4 mm, wherein the propellant and ignition charges are disposed in the propellant chamber.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a longitudinal sectional view through the smoke canister;
FIG. 2 is a longitudinal sectional view through the base of the smoke canister;
FIG. 3 is a plan view of the base of the propellant chamber shown in expanded scale;
FIG. 4 is a longitudinal sectional view through the base of the propellant chamber.


DESCRIPTION OF THE PREFERRED EMBODIMENT

FIG. 1 shows in a longitudinal section view a smoke canister 1, comprising a casing 10 preferably made by the deep drawing method, into which is injected the smoke-generating charge 12. The casing 10 is closed by a lid 14 having on its circumference two contact rings 13 separated by an insulating ring (see FIG. 2). The launcher, not shown here, consists in general of a cylindrical jacket and a base, and at the height of the said contact rings 13 the launcher has contact pins which are disposed in the launcher jacket in a spring-loaded and insulated manner. During firing the launcher's contact pins apply voltage to the smoke canister 1. This voltage is applied via electrical wiring 19a, connected with the contact rings 13, to an ignition charge 19, which is in the form of a electrical priming cap (FIG. 1, FIG. 2). The customary black powder propellant charge is also ignited in this manner and it creates propellant gases to launch the smoke canister 1, the pressure level of which does not exceed the pressure stability of the launcher. However, customary black powder propellants foul the contact means to a high degree and thereby dec

REFERENCES:
patent: 1039870 (1912-10-01), Wieser
patent: 2307369 (1943-01-01), Ferrel
patent: 3898609 (1975-08-01), Charles
patent: 4135455 (1979-01-01), Wallace
patent: 4164186 (1979-08-01), Beatty et al.
patent: 4353301 (1982-10-01), Jacobsen
patent: 4370929 (1983-02-01), Steinicke et al.
patent: 4619202 (1986-10-01), Romer et al.

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