Abstract: In some examples, a charge holder for a grenade has an envelope made from one or more layers of a sheet material to define an interior volume to receive a charge having a charge volume less than or equal to the interior volume and a neck configured to connect to a flashbang grenade body, wherein a ratio of a charge volume of the interior volume to an envelope material volume is about 5.0 or greater.

Abstract: A system for quick arming of a detonation or excitation assembly, wherein the system comprises a first barrier means which, as long as it has not been removed, prevents full activation of an initiation chain of the assembly, and whose removal is dependent on receiving indication from at least one first sensor, and then its removal is reversible in a manner that it will return and once again prevent full activation of an initiation chain, and a second barrier means which also prevents full activation of the initiation chain as long as it has not been removed, and whose removal is dependent on receiving indication from at least one second sensor, and this—following after receiving indication from the first sensor, and removal of the second sensor is irreversible in a manner that leaves the initiation chain executable, and wherein the first and second sensors are independent of one another, and as long as no indication has been received from the second sensor, the first barrier means is returnable to its place i

Abstract: A thermal rocket initiator mechanism, including a housing; a primer carriage translatable within the housing; a percussion primer disposed within the primer carriage; and a pair of actuator rods disposed within the housing where one of the pair of actuator rods is coupled to the primer carriage and the other pair of actuator rods is coupled to the housing. The mechanism further includes a rocker arm coupling the pair of actuator rods to one another where the pair of actuator rods are manufactured from a shape memory alloy that changes dimensions upon heating, translating the primer carriage within the housing and correspondingly actuating the percussion primer. The pair of actuator rods includes a long actuator rod and a short actuator rod. The percussion primer is actuated through a ramp structure coupled to the primer carriage and a spring structure coupled to the housing.

Abstract: An auxiliary safety mechanism for a grenade to prevent detonation from shockwaves, heat, fragments, etc., the grenade including a fuse housing containing a delay detonator and explosive train. In at least one embodiment, the fuse housing includes a reversible slider element interposed between the delay detonator and the rest of the explosive train to form a barrier therebetween when the grenade is in an unarmed condition, and when the slider element is withdrawn the barrier between the delay detonator and explosive train is removed leaving the grenade in an armed condition. In another embodiment, a further safety mechanism involves connecting the two sections of the housing with a weak connection that ruptures prior to the explosive contained therein reaching the critical explosive temperature/pressure.

Abstract: A safety and arming device may include a substrate and a frame fixed to the substrate. The frame may include a travel slot, a head socket, first and second gas expansion chambers having respective first and second nozzles, and first and second safety catch surfaces disposed adjacent to the respective first and second nozzles. A slider may be translatably disposed in the travel slot in the frame. The slider may include a latching head operable to latch in the head socket in an armed position of the device, a storage cavity for storing an explosive charge, first and second cantilevered arms disposed axially apart from each other and angled outwardly from the slider, and first and second deactivation cavities disposed adjacent to the respective first and second cantilevered arms. A spring may bias the slider away from the head socket.

Abstract: A safety and arming device for a spin-stabilized explosive projectile, said device incorporating a screen obstructing a transmission channel linking a detonator and a pyrotechnic relay, said screen comprising two half-screens able to move with respect to one another and transversally with respect to said channel, said two half-screens obstructing said channel when contacting one another, wherein said two half-screens are able to slide in a bore hole carried by a rotor coaxial to said projectile, said rotor is able to pivot on the axis of said projectile and carries said channel, said two half-screens locked into the position obstructing said channel by at least two locks, a first lock or inertial lock which retracts when said projectile is fired and a second lock or centrifugal lock formed by a spiral spring surrounding an external cylindrical surface of said rotor and applied against the ends of said half-screens.

Abstract: The invention relates to a safety device (1) for a block of explosive material, forming a missile decoy, that is introduced into an explosive material container (2) with a sabot (4) and an ignition transmission charge (5). The safety device (1) is characterized by a prestressed tube sensor/slide (6) that is connected between the sabot (4), the ignition transmission charge (5) and the explosive material container (2) such that it can release or re-close an ignition channel (13) disposed between the ignition transmission charge (5) and the explosive material.

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 small arms projectile for a small arms weapon is provided within a cartridge cover (1). A release element (15) is provided for preventing movement of the projectile's initiator (11) into an armed position. A channel (5) is formed between the initiator (11) and the projectile's explosive charge (8) and a slidable shield (6) is provided therein. An insert element (10) is also located in the channel for preventing movement of the shield (6) into its armed position. The insert element (10) is held in place by the cartridge cover (1). When the projectile exits the cartridge cover (1) following firing, the insert element (10) is configured to move out of the channel (5) to allow the shield (6) to move into its armed position.

Abstract: A mechanical safe and arm device for rotating munitions reduces arming scatter so that the “no arm” and “all arm” distance are substantially the same. A first spring holds a flywheel, a pinion gear, and a drive gear against rotation until centrifugal forces cause the spring to release them. The drive gear then rotates, causing rotation of the pinion gear and the flywheel. A post depending from the flywheel strikes and unlocks a second spring that unlocks a pivotally-mounted rotor that carries a detonator. The rotor then pivots and brings the detonator into alignment with a firing pin.

Abstract: A fuze for a projectile having a firing chain has an interrupter for interruption of the firing chain. The interruptor is configured to snap from a safe position to an armed position when unlocked. A locking device is disposed to lock the interrupter in the safe position and to unlock the interrupter by way of an unlocking movement. The fuze is rendered compact and reliable in that the unlocking movement of the locking device is an axial movement.

Abstract: A representative embodiment of the invention provides a MEMS-based safety and arming (S&A) device having a shuttle movably connected to a frame by one or more bowed springs. The device has an electrical path adapted to electrically connect the frame and a contact pad. In the initial state, the electrical path has an electrical break. If the inertial force acting upon the shuttle (e.g., during launch) reaches or exceeds a first threshold value, then displacement of the shuttle with respect to the frame causes the electrical break to close. If the inertial force reaches or exceeds a second threshold value greater than the first threshold value, then a latching mechanism employed in the S&A device latches to keep the electrical break irreversibly closed thereafter.

Abstract: A MEMS mechanical initiator having a striker arm extending from a striker body. The tip of the striker arm is adjacent to, but does not touch, the side of a microdetonator. A cocking and release mechanism moves the striker body such that the striker arm pulls away from the side of the microdetonator against the action of a set of springs connected to the striker body. Thereafter the cocking and release mechanism releases the striker body such that the tip of the striker arm swipes the side of the microdetonator causing initiation thereof.

Abstract: A small arms projectile for a small arms weapon is provided within a cartridge cover (1). A release element (15) is provided for preventing movement of the projectile=s initiator (11) into an armed position. The release element (15) is held in an engagement position by the cartridge cover (1). Also, a channel (5) is formed between the initiator (11) and the projectile=s explosive charge (8) and a slidable shielding means (6) is provided therein. An insert element (10) is also located in the channel for preventing movement of the shielding means (6) into its armed position. The insert element (10) is held in place by the cartridge cover(1). When the projectile exits the cartridge cover (1) and the weapon=s barrel following firing, the release element (15) is configured to move out of the engagement position to release the initiator (11), and the insert element (10) is configured to move out of the channel (5) to allow the shielding means (6) to move into its armed position.

Abstract: A safety and arming unit (11) which is designed in particular for an electrical fuze circuit (27) does not reliably respond just to lateral loads on one side, but responds only to centrifugal forces produced by the spin during free flight, in that two contact pairs (22-23, 22-23) which are connected electrically in parallel with one another via rings (14, 15) and are arranged diametrically opposite one another on a cross-sectional plane of the fuze (12) are both no longer electrically conductively bridged at the same time by the bolt (17) because, just by virtue of the centrifugal force, both bolts (17) are simultaneously moved radially outwards from their short-circuit safety positions in their blind holes (16), which are oriented transversely with respect to the rotation axis (13).

Abstract: An inertia igniter including a mechanical delay mechanism having two or more members which are movable under different acceleration conditions to sequentially move a movable member upon sequential movement of the two or more members and an ignition member actuatable by the movable member such that movement of the movable member by the two or more members ignites the ignition member. The movable member can be movable by one of translation and rotation. The inertia igniter can further comprise an impact mass releasably movable in the housing, wherein the impact mass is released and movable by movement of the movable member to impact the ignition member. The inertia igniter can also further comprise a stop member for preventing movement of the impact mass until the movable member has moved a predetermined distance.

Abstract: A safety and arming unit (10) for a spinning projectile fuze, which has a fuze body (12) and a bearing body (14), which define a spherical cavity (16) between them, in which a spherical rotor (18) is mounted such that it can rotate, in which rotor (18) a detonator (20) is provided. In order to make the safety and arming unit suitable for fuzes in weapon systems with extremely fast munition feed units, the rotor (18) can be surrounded by a rotor locking ring (28) in the safe position, prevents the rotor (18) from rotating through an acceleration ring (30) and a spring element (32) which connects the acceleration ring (30) to the rotor locking ring (28) in an interlocking manner, with the rotor locking ring (28) being formed with a slot (36) in order that it can be spread open by rotation and centrifugal forces into an open space (34).

Abstract: A safety and arming device (10) for a spinning projectile fuze, which has a fuze housing (12), which is in the form of a pot, and a bearing body (14) with a booster charge (16). A spherical rotor (42) with a detonator (44) is mounted between the fuze housing (12) and the bearing body (14). A radial groove (22) is formed in the fuze housing (12), and an annular groove (46) is formed in the rotor (42). A holding ring (28) is forced against the annular groove (46), which is axially offset with respect to the radial groove (22), when the safety and arming device (10) is in the safe position. The holding ring (28) is designed with a separating slot (30) and a further, shorter slot (32). The separating slot (30) and the further slot (32) extend at the same distance apart in the circumferential direction of the holding ring (28) and define annular segment jaws (40). The spring device (48) has a pair of cup springs (58), which jointly form a horizontal V-shaped spring profile.

Abstract: A safety and arming mechanism for a munition having a housing with a first detonator and an explosive mounted within the housing and in alignment with one another. A shaft is mounted within the housing. A first component is rotatingly fixed to the shaft and is moveable between a first and a second position. A second component is mounted on the shaft between the first detonator and the explosive. The second component is releasably fixed to the housing and is moveable between a safe and an armed position when it is released from the housing. The second component has a bore formed therethrough. The bore is aligned with the first detonator and the explosive when the first component is in the second position and the second component is in the armed position.

Abstract: A microscale firetrain for a safe and arm device having a safe position and an armed position, the firetrain including an input explosive column having a longitudinal axis; a transfer charge having a longitudinal axis and first and second ends and movable from a safe position to an armed position; a receptor charge having a longitudinal axis that is non-collinear with and substantially parallel to the longitudinal axis of the input explosive column; wherein, in the safe position, the transfer charge is remote from both the input explosive column and the receptor charge; and wherein, in the armed position, the input explosive column is adjacent the first end of the transfer charge to thereby initiate the transfer charge, the longitudinal axis of the input explosive column is substantially perpendicular to the longitudinal axis of the transfer charge, the second end of the transfer charge is adjacent the receptor charge to thereby initiate the receptor charge and the longitudinal axis of the receptor charge is

Abstract: A detonator is intended to be installed in a chamber equipped with a blockable access opening. The detonator includes a member for initiating a pyrotechnic chain and a casing for confining the initiation member. The casing includes, facing the initiation member, a port for igniting a pyrotechnic charge placed in the chamber outside the casing. The detonator also includes a shutter for blocking the port which can be moved between a retracted position clear of the port and a position for blocking the port. A device for operating the shutter keeps the shutter in the retracted position when access to the chamber is blocked, and in the blocking position when access to the chamber is open.

Abstract: An enclosed ignition flare igniter that includes a housing and two slider assemblies. The housing includes a first portion and a second portion. The two slider assemblies are disposed within the housing; each slider assembly has an armed position and a safe position. The armed position allows conflagrant communication between an ignition device and flare grain, while the safe position does not. Each slider assembly includes an ignition portal portion, a tab portion, and a spring. The ignition portal portion and the tab portion are juxtaposed. The ignition portal portion includes an ignition portal for holding an ignition device, while the tab portion includes a spring bore for accepting the spring.

Abstract: An igniter system for a flare that includes a housing, a slider assembly, and a piston assembly. The housing includes two ignition portals for holding ignition pellets. The slider assembly is disposed within the housing, and includes two sliders and a spring. Each slider corresponds to an ignition portal, and the two sliders communicate with the spring. The slider assembly has an armed position and a safe position, the armed position with the sliders uncovering the ignition portals and allowing conflagrant communication between the ignition pellets and flare grain, while the safe position with the sliders covering the ignition portal and not allowing conflagrant communication between the ignition pellets and flare grain. The piston assembly communicates with the housing. The piston assembly, when activated, can cause the slider assembly to be in the armed position.

Abstract: A MEMS type safe and arm apparatus for a fuze includes a setback slider responsive to a first setback acceleration, the setback slider moving linearly in response to the first setback acceleration; a setforward slider responsive to a first setforward acceleration, the setback slider unlocking the setforward slider, the setforward slider moving linearly in response to the first setforward acceleration; a first rotor responsive to a second setback acceleration, the setforward slider unlocking the first rotor, the first rotor rotating in response to the second setback acceleration; a second rotor responsive to a second setforward acceleration, the first rotor unlocking the second rotor, the second rotor rotating in response to the second setforward acceleration; and an arming slider that moves linearly in response to the rotation of the second rotor to thereby arm the fuze.

Abstract: Miniature arm fire and safe and arm devices include an electrically operated pyrotechnic initiation device (5) to generate a detonation wave upon command and a movable pressure barrier (9) that blocks propagation of the detonation wave if the device is not intended to be fired and opens a window (12) to transfer the detonation wave externally of the device. The detonation wave may in alternate embodiments be a subsonic flame front and pressure wave or a supersonic shock wave, respectively. An electromagnet (7) may serve to move the pressure barrier. Detonation waves output from the device have application in igniting an explosive train, either directly or indirectly, the latter by operating an electrical switch. In the arm fire device, the barrier automatically prevents a detonation output when electrical power is removed from the device. In the safe and arm device, the barrier, once moved out of the way, remains out of the way, even when electrical power is removed.

Abstract: A safe-and-arm device for a projectile fired from a smooth bore gun has a rotor that rotates between a safe position and armed position. A setback sensor retains the rotor in the safe position until an acceleration of the projectile causes the setback sensor to be repositioned. Once the setback sensor is repositioned, a bore rider is released and a rotor spring rotates the rotor to arm the projectile.

Abstract: The Auto-destruct fuze is a mechanism that provides a primary mode detona and a delayed auto-destruct/self-neutralize mode detonator function for a grenade or similar munition. The mechanics for the primary mode detonation is similar to the M223 fuze which the present invention is designed to replace. Operation of the auto-destruct/self-neutralize mode is based on the working principles of the Liquid Annular Orifice Device (LAOD). The LAOD is released from a locked position upon expulsion of the device from a storage container. The LAOD moves slowly under the urging of a spring and eventually releases a cleanup firing pin which activates a cleanup detonator to auto-destruct or self-neutralize the grenade.

Abstract: An explosive projectile carrying an active charge is to be launched from a barrel. Detonation of the charge requires that a firing pin be driven to a firing position where it impacts a percussion cap. The firing pin is held in a safety position by a barrel probe which is movable to an armed position in a direction perpendicularly to the launch direction. Prior to launching, the barrel probe is held immovable by engagement with both the launch barrel and an acceleration sensor. When the projectile leaves the barrel and acceleration displaces the acceleration sensor, the barrel probe is free to move to its armed position. Also provided are a pretensioned spring, and a pyrotechnical delay element for generating propulsion gas. Either the spring or the delay element functions to move the firing pin to its firing position, and the other of the spring and delay element moves the barrel probe to its armed position.

Abstract: A decoy flare ignition system is disclosed which includes an ignition initiator disposed at the aft end of the flare housing. An illuminant igniter is positioned in direct contact with the flare illuminant. The illuminant igniter includes at least one illuminant igniter pellet selected such that the firing of the ignition initiator triggers combustion of the illuminant igniter pellet if the safe-and-initiation device has been actuated. The igniter pellet is preferably configured as a circular cylindrical shell and is positioned over the bore of the flare illuminant.

Abstract: A priming system for the explosive charge of a sub-munition carried on board a carrier comprises a main firing pin, a primer tube operative to move from a safety position to an armed position, at least two devices to lock the primer tube in the safety position before the sub-munition is ejected, and a self-destruct mechanism operative to destroy the sub-munition after a predetermined delay. A first one of the locking devices is formed of a cam operative to move from a cam safety position, in which it forms a limit stop preventing the primer tube from passing freely into an armed position, to a retracted position in which it allows free passage of the primer tube. The cam carries an auxiliary firing pin to ignite a delay cord of the self-destruct mechanism. A second one of the locking devices engage the primer tube by the percussion tip of the firing pin to hold the primer tube in a safety position.

Abstract: The blocking disc serving as an explosive train interrupter of a safety and rming mechanism is angularly displaced from its safe position by a stepping motor through reduction gearing in response to timed energizing pulses applied thereto from a crystal-controlled pulse generator. The blocking disc is releasably latched in its safe position by a locking rod controlling the supply and cut-off of energizing voltage to the pulse generator to accurately time displacement of the disc to an armed position.

Abstract: A decoy flare with a sequenced ignition is disclosed. The flare comprises a case including an aperture for an impulse cartridge, a segment of pyrotechnic material and a sequencer igniter. The sequencer igniter includes a housing having an aperture, an ignition pellet and an interrupt positioned to cover the aperture when the sequencer igniter is in the case thereby separating the ignition pellet and the pyrotechnic material. When the impulse cartridge is ignited the segment of pyrotechnic material and the sequencer igniter move out of the case, the ignition pellet is ignited, the interrupt moves to uncover the aperture and the segment of pyrotechnic material is ignited.

Abstract: A submunition fuse presenting a tubular body; a support housed in sliding manner in the tubular body; a firing element housed in sliding manner in the support; a detonating element mounted facing the firing element in the armed position of the fuse; a strip fitted to the top of the support, projecting from the tubular body, and which, during descent of the fuse, exerts aerodynamic force on the support in a direction away from the detonating element; a first thrust spring acting on the support to generate a first thrust, in the direction of the detonating element, not exceeding the aerodynamic force; a second thrust spring acting on the firing element to generate a second thrust in the direction of the detonating element; and lock balls retained by the tubular body in such a position as to interfere with and lock the firing element in a withdrawn position.

Abstract: A shock detecting device includes a housing, a weight disposed in the housing and moved by a shock which is more than a predetermined value from outside, an output member rotatably disposed in the housing and rotated in response to the movement of the weight so as to be projected from the housing and a safety mechanism being provided with a stopper pin which is formed on the weight and which contacts with the housing in an initial condition in order to maintain the weight in the initial condition, a rock lever which is rotatably supported on the housing and which being able to engage or disengage with or from the stopper pin and a first urging device which is disposed between the rock lever and the housing always for urging the rock lever so as to be engaged the rock lever with the stopper pin. According to this improved shock detecting device, it is able to maintain the high reliability of the safety mechanism with a simple structure.

Abstract: An arrangement used in safing and arming a munition fuze includes a light sensor, a magnet, and a circuit composed of an inductor coil, a storage capacitor, and a photosensitive device. The light sensor is a fiber optic cable which responds to a flash of light generated by burning propellant of the munition by receiving and guiding the light energy to the photosensitive device. The magnet responds to setback of a projectile of the munition to move relative to the coil and generate an electrical voltage. The photosensitive device connected to the inductor coil responds to the voltage generated and to receipt of light energy from the light sensor by conducting electrical energy. An electro-explosive actuator connected to the photosensitive device is operable in response to conducting of electrical energy to actuate a rotor of the munition fuze from an unarmed condition to an armed condition.

Abstract: A fuse for a projectile comprises a first igniter. A rotor is rotatable to bring a second igniter and a detonator into a live position in alignment with the first igniter. The second igniter and detonator are spaced apart to define a recess therebetween. A retardation charge is mounted in that recess which can be selectively brought into alignment with the first and second igniters and the detonator if delayed ignition is desired.

Abstract: A safe and arm device for aligning elements of an energy transfer mechanism of an ammunition fuze includes an inertial mass, an energy transfer mechanism interrupt barrier component and an energy-loadable spring, all movably mounted in a bore of a housing of the device. The inertial mass is movable for producing an arming force in response to application of a predetermined acceleration force to the housing. The bi-stable barrier component is movable from a pre-armed stable safe position to a post-armed stable sterilized position in response to the applying of the arming force to the component upon being released from its stable safe position. In moving to its stable sterilized position, the barrier component moves through an armed position in which the elements of the energy transfer mechanism are aligned in firing relation with one another during a momentary period of time.

Abstract: Arming of a detonator carried within a tube-launched projectile is delayed n accordance with an operational program of a safety-arming system initiated by simultaneous and independent detection of projectile propulsion involving pressure generated by an activated projectile propelling motor and inertial forces accompanying acceleration of the projectile during launch. Operating energy necessary to complete the operational program, terminated after the projectile is launched, is stored within the projectile during launch in response to said generation of pressure by the activated propelling motor.

Abstract: The dud de-arming device serves to de-arm a fuze of a projectile which has remained lying on the ground or the place where it landed as a dud in order to prevent the discovered dud from still exploding when touched or moved. As to spinning projectiles the dud de-arming device should de-arm the fuze after disappearance of the projectile spin and for spinless projectiles the dud de-arming device should de-arm the fuze after a certain time following the impact deceleration of the spinless projectile. The dud de-arming device comprises a rotor which can be rotated by spring force. This rotor can assume an armed or live position due to the projectile spin or by virtue of the firing acceleration. Upon disappearance of the projectile spin or by virtue of the impact deceleration the rotor should assume a de-armed or safety position.

Abstract: A pyrotechnic fuze for projectiles, rockets, bomblets and mines, which is basically a pyrotechnic self-destruct device, in which a triggering device for a pyrotechnic delay arrangement is arranged within a housing. The triggering device consists of an igniting composition and a delay composition, a detonator for the triggering of an explosive charge and a striker for the detonator, whereby the detonator is arranged in a transversely movable slider.

Abstract: A rotating submunition member which, subsequent to ejection from a carrier, incorporates a target detection device projecting outwardly beyond the wall contour of the member in an operating position; and a fuze arrangement for a detonator which is disposed interiorly of the wall of the submunition. The submunition member is equipped with a securing or safe-and-arm device in which the detonator is located on a movable mounting or holder, which is displaceable through the intermediary of a spring-elastic power element from the SAFE position of the detonator into its ARMED position, when a flyweight has tensioned the power element and the target detection device is displaced into its operative position projecting beyond the wall contour of the submunition member.

Abstract: An initiating device which employs discardable arming members is disclosed. The design qualifies as a low cost, responsive, impact initiating system for a practice projectile. The method is embodied in a sub-caliber flight projectile as part of a mortar training device.

Abstract: It happens time and again that a fuze does not function and that the projectile remains in the field or the place where it landed as a dud. When such a dud is found the danger exists that it might explode upon the finder's touch or when moved or lifted. To prevent this danger the impact fuze in a dud should be able to de-arm itself in a non-explosive manner. This is achieved by positioning a dud insert or de-arming device between an explosive or firing train and a booster charge. This dud de-arming device contains an escapement device which after a predetermined delay time following impact of the projectile moves a rotor from its armed or live position into its de-armed or inert position. The dud de-arming device contains structure which, by virtue of the impact delay or deceleration, that is a delay in ignition of the booster charge upon the projectile hitting the target or ground, activates the escapement mechanism.

Abstract: A blind-setting or protective blocking device for a detonator, in particular for a detonator of a launched bomb, in which a release or tripping lever maintains a securing slider in a secured position. The tripping lever is maintained against the force of a spring through the intermediary of two latching elements, wherein, as a rule, the first latching element is released by an electronic circuit of the detonator within the launch tube or barrel, and the second latching element is released by the circuit subsequent to exiting from the launch tube, as a result of which the securing slider is placed into the armed position. The tripping lever is equipped with a projection which is associated with a contact stop on the securing slider, and in which the projection, in the secured position, is located outside of the path of movement of the contact stop, and pivots into the path of movement of the contact stop when the second latching element is also released prior to exiting from the launch tube.

Abstract: A projectile fuse comprises a rotor rotatable from a safety position to a live position. A slide is arranged to immobilize the rotor in its safety position. A piston is operably connected to the slide for displacing the slide to release the rotor for rotation. A conduit communicates one end of the piston with air pressure generated in response to firing of the projectile to shift the slide in a manner displacing the slide to release the rotor.

Abstract: A base element fuze having dual safing is disclosed. The fuze is useful with an explosive type shell propelled into a ballistic trajectory from the barrel of a gun. The fuze is actuated to move from first safety to the armed condition after experiencing the inertial setback forces of gun firing followed by the drag forces of deceleration during the ballistic flight phase before target impact. The firing circuit contains an inertial magnetic power supply or setback generator which produces a voltage pulse when the gun is fired, a storage capacitor to receive and store the pulse which is later used to initiate a detonator, and switch closure interface circuitry encircuiting the capacitor with the detonator at target impact. The sequence of events within the fuze is programmed by a spring driven rotor which is latched in first safety when assembled, is released when the gun fires, and moves to the armed position in about 18 ms.

Abstract: A hollow pivot pin, with an exposed primer at its side, holds boron potassium nitrate pellets 78 for igniting a flare. A spring-loaded firing pin mechanism is attached radially to the pivot pin and is swung about it by a parachute lanyard. When the firing pin becomes aligned with the primer charge, the firing pin is released and fires the charge.

Abstract: A coupling device for use with a primer and blasting cap in demolition fig devices and the like. The device includes a body portion defining a straight line path from the primer to the blasting cap. Also included is a moveable slide positioned in the body to block the straight line path and moveable to clear that path. A spring is used to act on the slide to clear the path, and a safety pin holds the slide against the spring until firing is desired. A time delay device such as a liquid annular orifice dashpot delays movement of the slide. A preferred embodiment uses two slides and two springs to first clear the path and second place a blasting cap lead in alignment on the path when the slides clear the path.

Abstract: An aerial flare having a safe-and-arm ignition system in which a radially vable valve element or slider is retained in a safe position obstructing ignition ports by engagement of the slider with interior walls of the flare casing. To deploy the flare, an expulsion charge is electrically detonated, ruptures a frangible barrier, ignites primer in the igniter, and expels igniter-illuminant assembly from the forward end of the casing. When the igniter clears the casing, the slider is powered radially outwardly under the force of a biasing spring to uncover the ignition ports so that the parts are in an arm position. The flaming primer then ignites the illuminant through the open ignition ports.