Ammunition and explosives – Igniting devices and systems – Ignition or detonation circuit
Patent
1987-08-20
1989-05-23
Kyle, Deborah L.
Ammunition and explosives
Igniting devices and systems
Ignition or detonation circuit
102216, F42C 1104
Patent
active
048319341
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a fuse for an electric firing projectile, comprising a circuit with an electric primer, a generator operating by inertia to supply under the accleration effect of the firing of the shot a charge to a capacitor intended to provide the energy for firing the electric primer by way of a firing contactor, the generator comprising a mobile magnetic core which is part of a magnetic circuit associated with a winding, the core being intended to move relative to the circuit to induce in the winding a current for charging the capacitor, the displacement of the core being prevented before the firing of the shot by a security member intended to be deformed when the generator is in operation.
SUMMARY OF THE INVENTION
A fuse of this type is described for example in Swiss Patent No. 314.554.
The present invention aims at rendering these fuses safer, in particular, at rendering them able to withstand relatively strong impacts that may occur during manipulation, without the danger of operating the generator.
For this purpose, the object of the present invention is a fuse characterized in that it comprises a mass which is able to move axially in the fuse but which is retained in an initial position by a spring, the mass being disposed so as to move against the action of the spring under the effect of the acceleration of the projectile at the firing of the shot, the mass cooperating with the mobile core after having executed a dead stroke and stocked an energy which contributes to the deformation of the security member to make it possible for the operation of the generator .
BRIEF DESCRIPTION OF THE DRAWING
The single FIGURE of the attached drawing shows diagrammatically and by way of example one embodiment of the fuse which is the object of the invention.
DETAILED DESCRIPTION
This fuse is intended to be mounted in a projectile, the front part of which is represented by the chain-dotted line 1. The fuse comprises an electric generator 2 consisting of a magnetic core 3 disposed inside a winding 4. The core 3 is intended to move rapidly towards the rear of the projectile at the moment of the shooting the projectile so as to induce a current in the winding 4 for charging a capacitor C by way of a diode D, the latter preventing then the discharge of the capacitor into the winding 4.
After being charged, the capacitor C becomes the power supply for the firing circuit. This circuit comprises an impact contactor 5 to ensure the firing of an electric primer 6. The contactor 5 comprises a mobile part 7, disposed right at the front of the projectile and subjected to the action of a spring 8 which keeps it away from a contact block 9. At the moment of impact, the mobile part 7 is displaced towards the rear of the projectile against the action of spring 8, so that its conducting part 10 touches the contact block 9. The charge of the capacitor C is then applied to the primer 6 by way of conductors 11 to 15.
In order to prevent an easy displacement of core 3, the latter is extended towards the rear of the projectile by a rod 16 which abuts on a thin metal plate 17 lying on a support 18 provided with a central opening 19. Therefore, in order to move towards the rear of the projectile, core 3 must exert a bearing force strong enough to pierce plate 17. The front part of core 3 is provided with an axial rod 20 which is engaged inside a cylinder 21 containing a spring 22 and an inertial mass 23. This cylinder 21 is disposed in a part 24 which is solid with the fuse assembly.
When the shot is fired, the mass 23 is displaced under the effect of its inertia against the action of spring 22 and strikes rod 20 with an energy large enough to make it possible for rod 16 to pierce plate 17. Core 3 is then displaced towards the rear of the projectile by the combined effects of the impact brought about by mass 23 and of its own inertia, by reason of the acceleration of the projectile.
In fact, in the event of a fall of the projectile from the platform of a truck onto very hard ground,
REFERENCES:
patent: 2498040 (1950-02-01), Jordan et al.
patent: 2966857 (1961-01-01), Toomey
patent: 3119335 (1964-01-01), Wyser
patent: 4316414 (1982-02-01), Hermanson
patent: 4345124 (1982-08-01), Abbin et al.
Gabnebin Pierre L.
Golay Jean-Pierre
Kyle Deborah L.
Mefina S.A.
Wendtland Richard W.
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