Abstract: A forty millimeter caliber exercise bullet has been improved for properly exploding on a target, and securely maintaining the unloaded status during ordinary time. The improved exercise bullet is comprised of: a skirt (200), a striking pin (10), a safety device assembly (300) consisting of a detent cover (310) with a central mounting groove (311) and a pair of mounting grooves (312), a detent (320) for retaining the striking pin (10) by engaging or disengaging into the circumferential groove (11) by springs (323), a detonator cap (330) forming a hollow pocket (331) to insert a detonator trigger (20), a washer (30), a press-spring (332) for pressing a guiding cap (340), an explosion pipe (400), a smoke shell (500), and an ogive (600). When the bullet is fired, the rotation of the bullet generates centrifugal force to slide the retainer outward for disengaging the circumferential groove. Then, the striking pin moves upward to impact the detonator trigger when it hit on the target.

Abstract: A fuze includes a shell, a plunger a firing pin unit, a spring, a receptacle, a plurality of detents, a detonation unit and a restraint unit. The plunger is movably provided in the shell. The firing pin unit is movably provided in the shell, in the vicinity of the plunger. The spring is compressed between the plunger and the firing pin unit. The receptacle is provided in the shell and movably connected to the firing pin unit. The detents are movably provided between the firing pin unit and the receptacle. The detonation unit is movably provided in the receptacle opposite to the detents. The restraint unit is provided in the shell and movably connected to the detonation unit.

Abstract: A SAFE and ARM mechanism includes an elongated casing having a first end and a second end. A high-G force firing pin is arranged relatively near to the first end and a low-G force firing pin is arranged relatively near to the second end. A detonator is arranged between the high-G force firing pin and the first end. When a G-force within a first range of magnitudes is applied to the casing along its longitudinal axis, the low-G force firing pin is displaced to strike a portion of the high-G force firing pin, and if a G-force within a second range of magnitudes is applied to the casing along its longitudinal axis, the high-G force firing pin is displaced to strike the detonator. The device may become ARMED in response to a centrifugal force generated by spinning the casing on its longitudinal axis.

Abstract: A stab type fuze mechanism, such as the 30 mm M759 fuze mechanism, which utilizes a generally horse shoe shaped configuration anti-setback spin clip initially lodged in a grove within the body of a target sensing probe, but extending partially therefrom, which extending part rests against a ledge within the aluminum o-give—located rearward from the target sensing probe; thereby preventing the target sensing probe from moving rearward within the fuze during firing and setback. After firing, with the onset of spin, the anti-setback spin clip will open, expanding away from, out of, and clear of the grove and into a cylindrical channel in which the target sensing probe is lodged. Due to a thinned area at the apex of the clip, the expansion of the anti-setback spin clip will be a plastic deformation and the clip will remain expanded.

Abstract: A command to arm apparatus includes a housing having a hollow interior. A pivotally-mounted rotor is disposed in the hollow interior. The rotor has a first, safe position of rotational adjustment that prevents detonation of an explosive and a second, armed position of rotational adjustment that enables detonation of an explosive. A locking cam is pivotally mounted to the rotor and has a rotor-locking position of repose. The rotor is free to rotate from its safe position to its armed position when the locking cam is rotated out of the rotor-locking position by a piston that extends from a piston actuator. The rotor abuts a flat formed in a sidewall of the housing and can rotate no further when the device is in the armed configuration.

Abstract: A fuze for a munition adapted to prevent unintended arming thereof. The fuze incorporates an arming screw having a keyed portion and a centrifugal locking mechanism for preventing rotation of the arming screw unless the fuze mechanism is in a rapidly spinning condition such as that experienced when the fuze and its associated munition are deployed from an airborne rocket or artillery shell, and thus spinning at a rate of at least several thousand rpm. The centrifugal locking mechanism includes a pair of locking members which are biased by biasing elements into engagement with the keyed portion of the arming screw. This prevents the arming screw from being accidentally unscrewed from an inertia weight within the fuze, thus placing the fuze in an unintended armed condition.

Abstract: A fuze for a munition adapted to prevent unintended arming thereof. The fuze incorporates an arming screw having a keyed portion and a centrifugal locking mechanism for preventing rotation of the arming screw unless the fuze mechanism is in a rapidly spinning condition such as that experienced when the fuze and its associated munition are deployed from an airborne rocket or artillery shell, and thus spinning at a rate of at least several thousand rpm. The centrifugal locking mechanism includes a pair of locking members which are biased by biasing elements into engagement with the keyed portion of the arming screw. This prevents the arming screw from being accidentally unscrewed from an inertia weight within the fuze, thus placing the fuze in an unintended armed condition.

Abstract: An air-safed underwater fuze system is provided for munitions that are to launch-deployed and water-detonated. A housing defines a first bore contiguous with a second bore. Radial ports in the housing communicate with the first bore. A first piston is slidably mounted in the first bore and a second piston is slidably mounted in the second bore and positioned flush with the first bore. Piston control means are coupled between the munitions and first piston for positioning the first piston in a first position prior to launch in which the first piston seals off the radial ports while being spaced apart from the second piston to define a chamber. The piston control means moves the first piston at launch to a second position so that the chamber expands and the radial ports are in communication with the chamber. The piston control means further drives the first piston from its second position towards its first position at a specified time after launch.

Abstract: A fuze of the type used in a rifle grenade assembly with a striker, a rotor nd a rotor lock includes one or more improvements. One pertains to the striker to prevent it from reaching a detonator-striking forward position more than once. Once it advances to the forward position it is locked in it by a spring biased locking pin. Other improvements relate to the release of the rotor by the rotor lock. The rotor remains locked, i.e. in the disarmed state even after intentional launching. It is released to assume the armed state only when the launched assembly accelerates at a certain rate toward the target.

Abstract: A fuze for firing the explosive charge of a projectile, comprising, in combination, a firing mechanism, including a firing pin, mounted resiliently in said projectile for rearward axial movement of the pin to fire the charge, a probe, including forward and rearward ends and an integral shear washer between the ends, mounted in the projectile with the forward end positioned to receive impact from media traversed by the projectile, with the rearward end slightly spaced forward of the firing mechanism, the washer normally preventing movement of the probe toward the mechanism, so that impact of the fuze with a rigid target shears the washer and enables the probe to engage the mechanism and thereby cause firing of the projectile.

Abstract: A hand grenade is provided with a fuze comprising: a firing means, means luding two centrifugally-operated elements movably carried by the grenade housing for arming the firing means, means including an inertia member rotatable relative to the housing and a torsion spring between the inertia member and the housing for spinning the housing to operate the arming elements, and manually-held safety means for preventing arming until the grenade is thrown. Two disclosed embodiments have different arming and firing means with substantially the same spinning means.

Abstract: A plurality of submunitions packed in a projectile deliver an incapacitat gas payload at far range from the projectile launch site only after the submunitions have been properly armed by mechanical removal of a blocker member from between an in-line firing pin and primer. A non-ground-impact type fuse detonates each submunition.