GB1106789A - Improvements in or relating to fuzes for practice projectiles - Google Patents

Abstract

1,106,789. Projectile fuzes. GEBRUDER JUNGHANS G.m.b.H. 27 April, 1965, No. 17764/65. Heading F3A. A fuze for a practice projectile to be fired from a rifled gun comprises impact-operated firing means mounted in the nose Sp of the fuze, the pressure wave generated travelling along an axial passage to operate the main firing means which is situate in the body of the fuze. Into the nose Sp is screwed a plug 48 housing a primer pellet 124 aligned with a firing pin which is supported by a striker 120 engaged by two centrifugal members 121 held together by a coil spring 122. On firing the projectile, the members 121 move apart and free the striker for operation on impact. Due to the acceleration of the projectile, striker pins 12 and a retaining cover 14 set back shearing safety pins 11 and a disc 13. The pins 12 strike primers 17, which in turn ignite delay trains 18 housed with their respective primers and firing pins in bores extending longitudinally through the wall of the fuze casing. When disc 13 is sheared, the cover 14 moves rearwardly and allows a spring 110 to expand. Segments 19 supporting the top 111a of a striker 111 then move outwards due to centrifugal force and free the striker. Striker 111 extends through a socket 42 forming part of a core 41, 40 and housing clockwork 112, through which extends a firing pin 113 aligned with the striker 111. Pivotally mounted within the core is a primer carrier 46 locked in the safe position by a latch 118 depending, from the clockwork. Centrifugal force starts the clockwork and after a certain time latch 118 releases the carrier 46, which then pivots to the armed position in which primer 117 is aligned with firing pin 113 and a relay charge 126. The fuze is then ready for operation on impact. In the meantime, carriers 43 pivot about their axles 44 until primers 114 are aligned with the delay trains 18 and relay charges 134. Thus if impact does not occur within a given time, the delays 18 ignite primers 114, which fire the relays 134 and hence charge 49 to bring about self-destruction. Should the projectile strike the target obliquely, the mass comprising the core 40, 41 and its contents and pellet 126 move forwards under their momentum against the action of spring 128 until pellet 117 hits the firing pin 113. A hammer 132 surrounding the striker 111 and supported by centrifugal weights 130, 131 may also bring about self-destruction. To equalize the pressure developed by the delays 18, a slotted sleeve 35 is introduced into each bore and a guide S surrounding each striker 12 has a certain amount of play, so that gas can escape to an annular groove 37a in a cover cap 37 overlying each bore.