Ammunition and explosives – Igniting devices and systems – Arming devices
Patent
1990-04-13
1991-02-12
Brown, David H.
Ammunition and explosives
Igniting devices and systems
Arming devices
102253, 102272, F42C 104, F42C 1524
Patent
active
049915100
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an impact fuse having fore-bore safety.
Such a fuse is known from German patent no. 24 26 838. A percussion needle stationary on the fuse has associated therewith an impact body directed slidingly in the projectile's direction of flight and bearing a percussion cap. This impact body is locked in the transport and firing position with the aid of locking balls in the fuse casing which are moved out of their locking position after firing and thus release the impact body. When the projectile hits a target, the impact body slides toward the percussion needle due to its inertia, thereby detonating the percussion cap. In order to prevent unintentional detonation in the immediate vicinity of the firing point, the impact body contains a groove open toward the front in the direction of flight with at least one blocking ball supported therein. Opposite the open end of the groove there is a shoulder stationary on the fuse with a receiving space for the ball adjacent thereto. During the acceleration upon firing of the projectile, the blocking ball is pressed onto the bottom of the groove. After the impact body is released when the projectile emerges from the projector, the firing acceleration ends. The projectile is now slowed down by air resistance. The ball, which is not subject to such air resistance, moves in its race toward the shoulder, due to the effect of the initial acceleration, and then runs into a receiving space. The length of time required by the ball for this process can be adjusted by appropriate dimensioning of the race. Should the projectile hit an obstacle within the range of the fore-bore safety, the impact body shoots toward the percussion needle but the blocking ball is jammed between the impact body and the shoulder, thereby preventing detonation. Detonation can take place only when the blocking ball has finally run into its receiving space.
The distance of fore-bore safety that can be achieved with this impact fuse is in the range of one meter or slightly more. This distance can be adjusted by lengthening the race, but this can only be done very imprecisely due to the friction of the ball between the groove and the cylinder housing.
The invention is based o the problem of stating an impact fuse of the type in question which allows for a greater distance of fore-bore safety and for reliable adjustment thereof to predefined values.
This problem is solved according to the invention by the features stated in the characterizing part of claim 1.
The race of the blocking all thus has a stepped design, the ball being reliably turned around on the steps so that the distances of fore-bore safety can be defined. Due to the blocking ball being turned around on the individual shoulders, one can determine very precisely the time lapse of the ball movement out of the starting position as far as the receiving space.
Further embodiments of the invention can be found in the subclaims. The invention shall be explained in more detail in an exemplary embodiment with reference to the drawing, in which
FIG. 1 shows a cross-section of a projectile nose with an inventive impact fuse:
FIG. 2 shows a cross-section of the projectile nose in a blocked position of the impact fuse.
An impact fuse 2 is disposed in the nose of a mortar practice cartridge 1 and has a percussion needle 3 stationary on the fuse and an impact body 1 containing a percussion cap 5 for detonating a smoke detonation 6 roughly sketched. Impact body 4 is slidingly mounted in the projectile casing surrounding it and is provided with a head 7 tapering forward in steps. This head 7 has a central bore 8 into which percussion needle 3 fits. Impact body 4 is held in its area adjacent the projectile casing with two locking balls 9 which engage bores 10 penetrating the casing, and depressions 11 on impact body 4. Projectile 1 is surrounded by a cartridge case 12, whereby an easily destructible cover 13, e.g. a plastic, paper or metal sheet, is situated between cartridge case 12 and locking balls 9.
Head 7 of impact body 4 has ann
REFERENCES:
patent: 190861 (1877-05-01), Hotchkiss
patent: 1509329 (1924-09-01), Woodberry
patent: 2595757 (1952-05-01), Brandt
patent: 2650541 (1953-09-01), Rosselet
patent: 3576165 (1971-04-01), Gawlick et al.
patent: 3995556 (1976-12-01), Lubbers
patent: 4036145 (1977-07-01), Lubbers
patent: 4487127 (1984-12-01), Lubbers
patent: 4723490 (1988-02-01), Sigrist
Brown David H.
Nico-Pyrotechnik Hanns-Jurgen Diederichs
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