ELECTROPRIMER BUSH Russian patent published in 1997 - IPC

FIELD: means for rocket engine solid-propellant ignition. SUBSTANCE: electroprimer bush has casing 1 accommodating ignition charge 9, central current lead-in 10 insulated from casing 1 by bush 11, and two disk electrodes 2,3 with initiating compound 6 and filament bridge 7 between them; the upper disk electrode is connected to the casing. To provide safety in use of the device, bush 11 accommodated current-conducting sleeve 13, whose base adjoins lower disk electrode 3. Sleeve 13 accommodates contactor 14 for axial movement to central current lead-in. The contacting surfaces of central current lead-in and contactor 14 are provided with permanent magnets 17, 18, whose like poles face each other. Central current lead-in 10 and contactor 14 may be made of diamagnetic material; contactor 14 may be made in the form of a cylinder. EFFECT: enhanced reliability. 3 cl, 2 dwg