Patent ID: 6226916
Filing Date: 2001-05-08
Classification: F41C

Abstract:
An ignition mechanism for percussion lock firearms using a percussion cap that surmounts an anvil at the end of a nipple that communicates with a firearm's barrel, comprising:a flash chamber, within the nipple, extending from the anvil towards the barrel that has an internal cross sectional area that is 0.008 square inches or less at some point within 0.23 inches of the anvil; anda check valve located between said flash chamber and the barrel includinga valve chamber communicating between said flash chamber and the barrel,a valve seat at the end of said valve chamber nearest to said flash chamber,an actuator free to move within said valve chamber and able to form a seal with said valve seat so as essentially to prevent the outward flow of gas from the barrel, andretainer means within said valve chamber, distant from said valve seat, for preventing egress of said actuator while maintaining communication of said valve chamber with the barrel, wherein said retainer means is effected by the step of piercing said valve chamber with a pin or bar.