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US 7,165,496 B2Granted
Piston head cartridge for a firearm
OwnerS. Paul Reynoldsinventor
Life of this patent
Estimating the term…
Abstract
A firearm cartridge is provided with a case body and a piston head. The piston head is movably engaged with a rearward end of the case body. The piston head seals the rearward end of the case body to contain propellant gases in the case body when the firearm cartridge is fired.
Claims39
A firearm cartridge, comprising:
- a case body including a wall extending between a forward end and a rearward end, said case body wall defining a hollow interior and propellant in said hollow interior;
- and
- a piston head including a forward end positioned in said hollow interior adjacent said rearward end of said case body and with propellant forwardly of said forward end of said piston head and further comprising priming composition in a recess between an outer surface of said piston head and said wall of said case body, said piston head being rearwardly movable relative to said case body via pressure from firing the firearm cartridge.
A firearm cartridge, comprising:
- a case body including a wall extending between a forward end and a rearward end, said case body wall defining a hollow interior;
- and
- a piston head including a forward end positioned in said hollow interior adjacent said rearward end of said case body in said hollow interior, said piston head including a flange extending therearound engageable with said wall of said case body, said piston head further including a groove extending forwardly of said flange, said groove and said wall of said case body defining a recess;
- and
- priming composition in said recess.
2 more elements
A firearm cartridge, comprising:
- a case body including a wall extending between a forward end and a rearward end, said case body wall defining a hollow interior for receiving propellant;
- and
- a piston head including a forward end positioned in said hollow interior adjacent said rearward end of said case body, said piston head including a flange extending thereabout and a forwardly opening recess in said forward end in communication with said hollow interior, said piston head being expandable by pressure in said recess created upon firing of the cartridge to seal said flange against an inner surface of said wall of said case body.
Dependencies are inferred from the claim text.