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OBTURATED FIREARM BREECH SAFETY DEVICE

  • US 3,738,224 A
  • Filed: 11/23/1971
  • Issued: 06/12/1973
  • Est. Priority Date: 11/23/1971
  • Status: Expired due to Term
First Claim
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1. In a firearm comprising a barrel having a breech end and chamber means extending inwardly therefrom including a chamber for receiving a cartridge for discharge, said cartridge including a case having an extractor groove, a bolt disposed for longitudinal reciprocation to and from a locked battery position, said bolt including a head provided with a recess extending thereinto for receiving the rear end of said case including said extractor groove, obturating means operationally disposed for sealing said breech end gas tight between said chamber means and said bolt responsive to movement thereof to the locked battery position, an extractor carried by said bolt for extracting said cartridge case from said chamber, said extractor having a tubular body receivable by said bolt recess for retention therein and a tang integral with said body and disposed for engagement with said extractor groove, and relief means associated with said bolt, said extractor, said head, and said barrel for relieving gas pressure generated by discharge of said cartridge in excess of predetermined safe limits, said relief means comprising aligned escape holes extending through said bolt head, said extractor, and said barrel from said recess to the ambience and means normally blocking said escape holes and being subject to removal in response to excessive gas pressure in said chamber thereby to open said escape holes.

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