Patent ID: 6505560
Filing Date: 2003-01-14
Classification: F42B

Abstract:
A spring disc for securing a combustible cartridge case to a case base comprising:(a) a contiguous outer ring including a first plurality of holes and having a contiguous, upwardly curved portion having an outer edge; (b) a contiguous middle ring encompassing a second plurality of holes; (c) a contiguous inner ring, encompassed by said contiguous outer ring and said contiguous middle ring, the contiguous inner ring surrounding a central aperture sized to accommodate installation onto a cartridge case base member, where the contiguous outer ring, contiguous inner ring and contiguous middle ring operate together so as to support the cartridge case by evenly distributing stresses; and (d) a bottom including the contiguous outer ring, contiguous inner ring and contiguous middle ring, wherein a taper angel &thgr; is built into the bottom and the taper angle &thgr; has a value of at least 1Â° as measured from the bottom extending radially from the center of the contiguous inner ring to the outer edge with reference to a plane parallel to an imaginary plane overlaid on the contiguous outer edge.