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

• Current Assignee: Frederick P. Reed, John S. Post
• Original Assignee: Frederick P. Reed, John S. Post
• Inventors: Reed, Frederick P., Post, John S.
• Primary Examiner(s): Borchelt, Benjamin A.
• Assistant Examiner(s): Tudor, Harold
• Application Number:
  US05/201,524
• Time in Patent Office: 567 Days
• Field of Search: 89/26 42/16
• US Class Current: 89/26
• CPC Class Codes: F41A 15/14 the ejector being mounted on or within the bolt; Extractors per se
• CPC Class Codes: F41A 17/00 Safety arrangements, e.g. safeties
• CPC Class Codes: F41A 3/12 Bolt action, i.e. the main breech opening movement being parallel to the barrel axis

Abstract

In a firearm comprising a reciprocating bolt, the pin for retaining the extractor against rotation in the nose thereof is adapted to be blown radially from the firearm through a cooperating passage responsive to excessive gas pressure in the barrel for release thereof. In an alternate embodiment the tubular body of the extractor is thinned down where coincident with the inner mouth of the passageway so as to be rupturable by excessive gas pressure for release thereof through the passageway.

Claims

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.

2. The invention as defined in claim 1 wherein said blocking means comprises a pin having a tapered head, said pin being disposed through said extractor escape hole into said head escape hole with the tapered head thereof disposed within said extractor escape hole and being of larger diameter than said head escape hole.

3. The invention as defined in claim 1 wherein said blocking means comprises a section of said extractor body in registry with said escape holes and dimensioned to a thickness conducive to rupture in response to excessive gas pressure in said chambEr thereby to provide an escape port therein.