Abstract: In a weapon subject to a sequence of high acceleration followed by high spin and including a detonator and an explosive charge; the improvement comprising a barrier having two parts located between the detonator and explosive charge to normally form an obstruction to prevent accidental detonation of the explosive charge by the detonator. Mechanical locking means are provided to lock the barrier in place, comprising a split cylinder and a spirally wound ribbon, a pair of pins restraining the outer surface of the ribbon to prevent premature unwinding. When the weapon is fired from a gun, the high acceleration will remove the pins and allow the ribbon to unwind. Upon unwinding the entire ribbon, the barrier under the action of spin, will be removed to provide an unobstructed path between the detonator and explosive charge.

Abstract: A safing and arming device mounted inside the shell of small caliber ammunition for normally forming a barrier between a detonator and an explosive train contained in the shell. A soft wire of lead, aluminum or plastic material, embedded in a groove in the top of the barrier normally holds it against movement. As the result of high spin, the barrier is forced to move so as to open a path between said detonator and explosive train to enable arming after a safe delay. The barrier may be two halves tied together by the soft wire of stretchable material which will slowly stretch as the result of high spin and ultimately break, allowing the halves to move apart radially to open the path. A modification of the barrier is to normally position it eccentrically of the center of gravity, at which location it forms a barrier. High spin will effect cutting of the wire and movement of the barrier to a non-blocking position.

Abstract: A mine fuze timer having a ball serving as a locking element, which ball is released after the elapse of a predetermined time period. Such time period may be determined by a timer by exerting needed load against a readily deformable material, or as an alternative, by a dash-pot using a viscous liquid. The mine fuze timer is glued to the top of a mine containing a borerider and is encased in a mine canister. A fuze for small caliber ammunition, with a barrier consisting of two halves tied together by a soft wire and locked in safe position by two setback pins. The stretching and the eventual ruture of the soft wire, under the influence of spin which follows the setback at the time of firing, ensures the necessary safety delay for arming.

Abstract: In a weapon subject to a sequence of high acceleration followed by high spin and including a detonator and an explosive charge; the improvement comprising a barrier located between the detonator and explosive charge to normally form an obstruction to prevent accidental detonation of the explosive charge by the detonator. Mechanical locking means are provided to lock the barrier in place, comprising a spirally wound ribbon, a pair of pins restraining the outer surface of the ribbon to prevent premature unwinding, and a pair of superimposed anti-friction balls mounted on a hub portion of the ribbon, the upper ball being seated in an extension portion of the barrier. When the weapon is fired from a gun, the high acceleration will remove the pins and allow the ribbon to unwind. Upon unwinding the entire ribbon, the balls will be released and the barrier under the action of spin, will be removed to provide an unobstructed path between the detonator and explosive charge.

Abstract: This is a new point-detonating fuze for spin-stabilized munitions. The fuze has three modules housed in a two-piece body, designed to optimize the penetration capability and to adjust the weight of the fuze. The upper body carries the point-detonating module which has a double-initiation feature, designed to function on impact against the target but preventing detonation on impact against rain droplets and against the foliage of wooded areas. The explosion, initiated at the top of the point-detonating module, is propagated by a mild-detonating fuze, first axially inside the shaft of the point-detonating module, then axially through the time-delay module, to reach the detonator in the safing-and-arming module. The point-detonating module acts as a selector designed to provide either a super-quick function or a time-delay function with several time-delay options. The desired choice is made by rotating the moving portion of the time-delay module to one of several pre-indexed positions.

Abstract: A fuze for a spin-stabilized artillery projectile comprises a body includ: an ogive member containing point-detonating firing means, selectable for super-quick or delay firing; and a base member containing an inertial delay fuze operable by either direct or graze impact, a combustible fuse loop surrounding the inertial delay fuze and exposed to the point-detonating firing means, and a firing train coupling the inertial delay fuze and the fuse loop to a booster charge for initiating the main explosive charge of the projectile.