Ammunition and explosives – Shells – With secondary shells
Patent
1992-06-16
1993-09-14
Tudor, Harold J.
Ammunition and explosives
Shells
With secondary shells
102259, 102334, 102357, F24B 1258
Patent
active
052439178
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a projectile for the dispersal of a load in the form of a pyrotechnic charge with a predetermined time delay after firing the projectile from a launching tube with gas under pressure. Such a projectile comprises a cylindrical casing with a first pressure chamber, formed by a portion of the casing together with a cross wall arranged in the casing and an external side wall, provided with at least one supply opening for the gas to the first pressure chamber. The projectile further comprises a second pressure chamber formed by a second portion of the casing, said cross wall and a piston axially movable with slide fitting in the casing, and the load, which stands in connection with the piston. A throttled gas connection is arranged between the first and second pressure chambers. The piston, under the effect of a pressure built up in the second pressure chamber, is arranged to perform an axial movement, pushing the load out of the casing, but not until the pressure has reached a predetermined level.
Such projectiles are known in principle, for instance from Swedish patent No. 7802120-1. In it there is an interlocking pin, which keeps said piston in a starting position, until the pressure in the second pressure chamber has reached a predetermined level, which is determined by the shearing resistance of the interlocking pin. This known projectile is, however, intended to fire and disperse a load consisting of a multiplicity of radarreflecting strips tightly packed in a casing.
The object of the present invention is to provide a projectile of the kind mentioned by way of introduction, which is suitable for reliable firing and ignition and thereby dispersal of a pyrotechnic charge. The projectile shall have a simple, reliable construction.
According to the invention such a projectile is characterized in that a third pressure chamber standing in connection with the first pressure chamber, is arranged in the first piston, formed by a barrel in which a second piston is arranged movable with slide fitting, provided with a striking pin intended to activate an igniting element for igniting a charge, a first locking element being arranged to detend the second piston against movement for as long as the movement of the first locking element is detended by a second locking element extending in the longitudinal direction of the projectile. The second piston is preferably arranged movable in the longitudinal direction of the projectile, but other constructions are conceivable within the scope of the invention. The first locking element is suitably formed as a dowel, movable in a barrel in the first piston, perpendicular to the longitudinal direction of the projectile and thereby of the piston. The second locking element consists in a preferred embodiment of the invention of the internal wall of the projectile casing.
The invention will now be described in more detail with reference to the accompanying figure, which shows, schematically, a longitudinal section of a projectile according to the invention.
In the figure a launching tube is designated by 1, a projectile casing by 2, a cross wall in the casing by 3 and an external side wall by 4. This is provided with two supply openings 5 for gas under pressure. A first check valve, designated by 6, is arranged to allow gas passage into but not out of a first pressure chamber 7, which is formed by the casing 2, the cross wall 3 and the side wall 4. A first piston 8 is arranged axially movable with slide fitting in the casing, the second pressure chamber 9 being formed by the casing 2, the cross wall 3 and the piston 8. A load in the form of a pyrotechnic charge is designated schematically by 10, with an igniting element 11. The first piston 8 is designed with a central, internal, axially directed circular-cylindrical portion 12, which with a portion 13 in the starting position of the piston extends through and is movable with slide fitting through a barrel 14 in the cross wall 3. In the portion 13 an axial channel 15 is arranged. This connects the fi
REFERENCES:
patent: 3576165 (1971-04-01), Gawlick et al.
patent: 3623432 (1971-11-01), Schminke
patent: 3712224 (1973-01-01), Hanzel
patent: 4333402 (1982-06-01), Landstrom et al.
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