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US 7,841,279 B2Granted
Delayed extraction and a firearm cartridge case
OwnerGeorge L. Reynolds, S. Paul Reynoldsinventors
Life of this patent
Estimating the term…
Abstract
A high pressure cartridge case is provided for firearms with blowback operating systems. The cartridge case is provided with a primer support member that supports a primer in a rearward end of a cartridge case. The support member is slideable rearwardly in the cartridge case when the cartridge is fired. The components expand to seal with the cartridge case to prevent the escape of gas around the support member when the propellant is ignited.
Claims20
A cartridge for a firearm, comprising:
- a cartridge case and a propellant contained in said cartridge case, said cartridge case further defining a recess extending forwardly from a rearward end of said case to an end wall adjacent to said propellant;
- a projectile at a forward end of said cartridge case;
- a primer support member in said recess adjacent said rearward end of said cartridge case, said primer support member including a pocket extending therein that opens at a forward end of said primer support member, said primer support member further including a flange extending around said pocket at said forward end of said primer support member and a groove in an outer surface of said primer support member rearwardly of said flange, said groove permitting propellant gases generated upon firing said cartridge to seal said flange of said primer support member against said cartridge case while said groove is located in said recess to collect any propellant gases passing through said seal between said primer support member and said cartridge case;
- and
- a primer in said pocket for holding priming composition between said primer support member and said propellant.
2 more elements
A cartridge for a firearm, comprising:
- a cartridge case and a propellant contained in said cartridge case, said cartridge case further defining a recess extending forwardly from a rearward end of said case to an end wall adjacent to said propellant;
- a projectile at a forward end of said cartridge case;
- a primer support member in said recess adjacent said rearward end of said cartridge case, said primer support member including a pocket extending therein that opens at a rearward end of said primer support member, said primer support member further including a passage extending from said pocket through a forward end of said primer support member, said passage defining an anvil adjacent to said forward end of said primer support member and said primer support member includes a support surface in said pocket around said passage;
- a primer in said passage of said primer support member, said primer including a forward end adjacent said anvil and a body extending to a primer head opposite said forward end that is located in said pocket of said primer support member, said primer further including a shoulder that extends outwardly from said body and is positioned adjacent to said support surface in said pocket to form a plenum in said pocket between said primer head and said shoulder;
- and
- priming composition between said forward end of said primer and said anvil.
3 more elements
A cartridge for a firearm, comprising:
- a cartridge case and a propellant contained in said cartridge case, said cartridge case further defining a recess extending forwardly from a rearward end of said case to an end wall adjacent to said propellant;
- a projectile at a forward end of said cartridge case;
- a primer support member in said recess adjacent said rearward end of said cartridge case, said primer support member including a pocket extending therein that opens at a rearward end of said primer support member, said primer support member further including a passage extending from said pocket through a forward end of said primer support member, said passage defining an anvil adjacent to said forward end of said primer support member and said primer support member includes a support surface in said pocket around said passage;
- a primer in said passage of said primer support member, said primer including a forward end adjacent said anvil and a body extending to a shoulder that extends outwardly from said body and is positioned adjacent to said support surface in said pocket;
- and
- priming composition between said forward end of said primer and said anvil, wherein said primer support member includes a groove extending around an outer surface thereof adjacent to said forward end of said primer support member and said cartridge case includes a cannelure thereon to press material of said cartridge case into said groove.
3 more elements
A cartridge for a firearm, comprising:
- a cartridge case and a propellant contained in said cartridge case, said cartridge case further defining a recess extending forwardly from a rearward end of said case to an end wall adjacent to said propellant;
- a projectile at a forward end of said cartridge case;
- a primer support member in said recess adjacent said rearward end of said cartridge case, said primer support member including a pocket extending therein that opens at a rearward end of said primer support member, said primer support member further including a passage extending from said pocket through a forward end of said primer support member, said passage defining an anvil adjacent to said forward end of said primer support member and said primer support member includes a support surface in said pocket around said passage;
- a primer in said passage of said primer support member, said primer including a forward end adjacent said anvil and a body extending to a shoulder that extends outwardly from said body and is positioned adjacent to said support surface in said pocket;
- and
- priming composition between said forward end of said primer and said anvil, wherein said body of said primer includes grooves in an outer surface thereof extending around opposite sides of said shoulder.
3 more elements
A cartridge for a firearm, comprising:
- a cartridge case and a propellant contained in said cartridge case, said cartridge case further defining a recess extending forwardly from a rearward end of said case to an end wall adjacent to said propellant;
- a projectile at a forward end of said cartridge case;
- a primer support member in said recess adjacent said rearward end of said cartridge case, said primer support member including a pocket extending therein that opens at a rearward end of said primer support member, said primer support member further including a passage extending from said pocket through a forward end of said primer support member, said passage defining an anvil adjacent to said forward end of said primer support member and said primer support member includes a support surface in said pocket around said passage;
- a primer in said passage of said primer support member, said primer including a forward end adjacent said anvil and a body extending to a shoulder that extends outwardly from said body and is positioned adjacent to said support surface in said pocket;
- and
- priming composition between said forward end of said primer and said anvil, wherein said shoulder is deformable against said support surface when a rearward end of said primer is struck with a firing pin.
3 more elements
A cartridge for a firearm, comprising:
- a cartridge case and a propellant contained in said cartridge case, said cartridge case further defining a recess extending forwardly from a rearward end of said case to an end wall adjacent to said propellant;
- a projectile at a forward end of said cartridge case;
- a primer support member in said recess adjacent said rearward end of said cartridge case, said primer support member including a pocket extending therein that opens at a rearward end of said primer support member, said primer support member further including a passage extending from said pocket through a forward end of said primer support member, said passage defining an anvil adjacent to said forward end of said primer support member and said primer support member includes a support surface in said pocket around said passage;
- a primer in said passage of said primer support member, said primer including a forward end adjacent said anvil and a body extending to a shoulder that extends outwardly from said body and is positioned adjacent to said support surface in said pocket;
- and
- priming composition between said forward end of said primer and said anvil, wherein said primer support member and said cartridge case form a space at a forward end of said primer support member and further comprising a seal in said space around said passage of said primer support member.
3 more elements
A cartridge for a firearm, comprising:
- a cartridge case and a propellant contained in said cartridge case, said cartridge case further defining a recess extending forwardly from a rearward end of said case to an end wall adjacent to said propellant;
- a projectile at a forward end of said cartridge case;
- a primer support member in said recess adjacent said rearward end of said cartridge case, said primer support member including a pocket extending therein that opens at a rearward end of said primer support member, said primer support member further including a passage extending from said pocket through a forward end of said primer support member, said passage defining an anvil adjacent to said forward end of said primer support member and said primer support member includes a support surface in said pocket around said passage;
- a primer in said passage of said primer support member, said primer including an elongate body with a forward end adjacent to said anvil, a cavity extending into said body from said forward end, and a shoulder extending outwardly from said body positioned adjacent to said support surface in said pocket, wherein said body includes a wall extending around said cavity that is deformable when the cartridge is fired to sealingly engage said forward end of said primer in said passage of said primer support member;
- and
- priming composition in said cavity of said primer and between said forward end of said primer and said anvil.
3 more elements
Dependencies are inferred from the claim text.