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US 6,779,457 B2Granted
Percussion fuse (ignition device)
AssigneeRuag Munition
InventorsJörg Kutzli, Pascal Guenot
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AssigneeRuag Munition
InventorsJörg Kutzli, Pascal Guenot
Estimating the term…
A method and apparatus for protecting and arming fuses in a projectile to satisfy safety requirements and to initiate ignition with only minimal delay. In accordance with the method, after launch of a projectile, behind a cap having a central inlet opening a safety device of a turbine/ignition pin unit is released and the impeller thereof is subjected to ram pressure. The ram pressure displaces the turbine/ignition pin unit into a front position, to act as impact detector. In a device constructed in accordance with the invention, the turbine/ignition pin unit has a screw thread on its shank and is screwed into a threaded bushing so that the ram pressure displaces the unit, against the direction of flow into the front position. On impact, the rear end of the unit acts as a percussion needle and initiates an ignition chain.
A method for protecting and arming a mechanical percussion fuse in a projectile having safety devices operating physically independently of one another and having a linearly displaceable striking pin or ignition pin having an electrical ignition contact, characterized in that, during launching, inertia of a mass releases a ram pressure responsive element, the striking pin or ignition pin is displaced relative to the projectile by and opposite to a ram pressure acting on the and a pressure-responsive element from a first, protected position at a rear viewed in a launching direction into a second, armed position at a front;
A device for securing and arming a mechanical impact fuse in a projectile having safety devices acting physically independently of one another and having a linearly displaceable striking pin or ignition pin having an electrical ignition contact wherein post-barrel safety is controlled by a turning rotor delayed by means of a clock mechanism, characterized in that at a head of the projectile there is provided an inlet opening for ram pressure, in that behind the inlet opening there is provided an impeller that is fixed to a front end of the striking pin or ignition pin, in that the striking pin or ignition pin has a screw thread on a shank and in that the thread is inserted in a screw thread of a threaded bushing and the turning rotor has an initiation charge rotatable into a position aligned with the striking pin or ignition pin when in a front position, such that the ram pressure acting on the impeller displaces the striking pin or ignition pin from a first, rear position into the front position, so that on impact of the projectile the striking pin or ignition pin initiates an ignition process by rearward displacement into a third position extending beyond the second position and engaging the initiation charge.
Dependencies are inferred from the claim text.