Shaped charge with rotational insert

Claim 1

A HOLLOW CHARGE EXPLOSIVE DEVICE COMPRISING A CASING WITH AN EXPLOSIVE CHARGE WITH A HOLLOW SPACE IN THE EXPLOSIVE CHARGE, A SUBSTANTIALLY FUNNEL-SHAPED INERT LONGITUDINALLY DISPOSED IN THE DEVICE TO SERVE AS A LINING FOR THE HOLLOW SPACE, SAID INSERT HAVING WORKING SURFACES WHICH ARE SO SHAPED THAT DURING THE DETONATION OF THE EXPLOSIVE CHARGE A TANGENTIAL COMPONENT OF FORCE IS IMPARTED BY THE DETONATION PRESSURE TO THE PARTS OF THE MATERIAL OF THE INSERT TO CAUSE THE INSERT TO ROTATE AS IT IS PROPELLED, SAID INSERT BEING SHAPED AS A STEPPED CONE HAVING SURFACE STEPS, AS VIEWED IN CROSS-SECTION IN A PLANE AT RIGHT ANGLES TO THE LONGITUDINAL AXIS OF THE CONE, INTERCONNECTED WITH CURVED BOUNDARY LINES AS GENERATING SURFACES, THE CURVATURES OF THE BOUNDARY LINES BEING SO ARRANGED AND SO FORMED THAT THEIR CENTERS FOLLOW EACH OTHER ON A CIRCLE AROUND THE LONGITUDINAL AXIS OF THE CONE, A PROJECTILE PROVIDED IN THE INSERT AND WHICH IS AN ELONGATED SPIKE-LIKE OBJECT, AND AT LEAST PART OF THE SURFACE OF THE INSERT IS PROVIDED WITH GROOVES HAVING AN ANGLE OF TWIST.