Percussive photoflash lamp and method of securing anvil thereof

Claim 1

oThe method of securing a primer anvil wire within a primer tube of a percussive-type photoflash lamp, said method comprising: supporting said primer tube at a predetermined vertical position with respect to a plurality of conically pointed pins radially disposed about said tube in a symmetrical pattern about the longitudinal axis thereof; supporting said anvil wire within said tube substantially coaxial therewith; pressing said plurality of pins simultaneously and uniformly against said tube toward the longitudinal axis thereof by one direction of longitudinal motion of a cylinder which is coaxial with said tube and has a set of cam surfaces retaining and bearing against follower heads at the outer ends of said pins, the pressure applied to said pins being sufficient to securely retain said anvil concentrically within said tube by means of the resulting indentations made in said tube; and withdrawing said pins from said tube by reversing the direction of longitudinal motion of said cylinder whereby said set of cam surfaces bear on said follower heads in a manner causing said pins to be pulled radially outward by said cam surfaces.