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US 4,709,617 AGranted
Firearm
OwnerJohn A. Andersoninventor
Life of this patent
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OwnerJohn A. Andersoninventor
Estimating the term…
An automatic gas-operated forward recoiling combat shotgun has a reciprocally movable barrel which includes a bore and a revolving magazine which defines a circumaxially spaced series of firing chambers. In firing position, one of the firing chambers is coaxially aligned with and forms a rearward extension of the bore. A cam actuated indexing mechanism sequentially positions each of the firing chambers in firing position in response to reciprocal movement of the barrel. A manually reciprocally movable foregrip functions to cock the shotgun firing mechanism and also cooperates with the trigger mechanism to release the magazine when the forearm is operated while the trigger held in a firing position. A cocking trigger enables silent cocking or uncocking of the firing mechanism. The casing of each shell forms a seal between an associated firing chamber and the barrel when the weapon is fired.
A firearm comprising a receiver, a barrel supported by said receiver and having a generally cylindrical bore, a rotary magazine having a circumaxial series of firing chambers, magazine retaining means for releasably securing said magazine to said receiver for rotation about its axis of rotation and including a first member coaxially disposed within said magazine, means for indexing said magazxine about its axis of rotation to sequentially locate each one of said firing chambers in a firing position wherein said one firing chamber is coaxially aligned with said bore, firing means for exploding a shell disposed within said one firing chamber and having a cocked position and a firing position, a firing trigger movable from an inactive position to a firing position to release said firing means from its cocked position, manually inoperable means for cocking said firing means including a grip assembly supported for reciprocal movement relative to the receiver and including a second member telescopically engaged with said first member, and coupling means for releasably connecting said second member to said first member in response to movement of said firing trigger to a predetermined position, said magazine retaining means being operable to release said magazine from said receiver in response to operation of said grip assembly when said first member is connected to said second member by said coupling means.
A firearm comprising barrel having a bore extending axially therethrough, means supporting said barrel for axial reciprocal forward and rearward movement, a generally cylindrical rotary magazine drum having front and rear walls and defining a circumaxial series of firing chambers and a circumaxial series of sets of cam recesses equal in number to said firing chambers each of said cam recesses opening outwardly through the peripheral surface of said drum and having generally angularly opposed wall surfaces defining a cam track, each of said sets of cam recesses including a front cam recess opening outwardly through said front wall and a rear cam surface independent of said front cam recess and opening outwardly through said rear wall, means supporting said magazine drum rearward of said barrel for indexible rotation about its axis, and means for indexing said magazine drum about its axis to sequentially position each one of said firing chambers in a firing position wherein it is coaxially aligned with and defines a rearward extension of said bore and including a front indexing cam for engaging the cam track of an associated front cam recess during rearward movement of said barrel and a rear indexing cam for engaging the cam track of an associated rear cam recess during forward movement of said barrel, and means for moving said indexing cams in unison in response to said movement of said barrel.
A firearm comprising a receiver, a barrel supported by said receiver and having a generally cylindrical bore, a rotary magazine supported for indexible rotation on said receiver and having a circumaxial series of firing chambers, magazine retaining means for releasably securing said magazine to said receiver, means for indexing said magazine about its axis of rotation to sequentially locate each one of said firing chambers in a firing position wherein said one firing chamber is coaxially aligned with said bore, firing means for exploding a shell disposed within said one firing chamber and including manual operating means for cocking said firing means and a firing trigger movable from an inactive position to a firing position to release said firing means from its cocked position, and coupling means for releasably connecting said magazine retaining means to said manual operating means in response to movement of said firing trigger to a predetermined position, said magazine retaining means being operable to release said magazine from said receiver in response to operation of said manual operating means when said magazine retaining means is connected to said manual operating means by said coupling means.
A firearm comprising a barrel having a bore extending axially therethrough, means supporting said barrel for axial reciprocal forward and rearward movement, a rotary magazine having a circumaxial series of generally cylindrical firing chambers, means supporting said magazine rearward of said barrel for indexible rotation about its axis, means for indexing said magazine about its axis to sequentially position each one of said firing chambers in a firing position wherein it is coaxially aligned with and defines a rearward extension of said bore and including a circumaxial series of sets of cam tracks on said magazine, means for firing a shell disposed with said firing chamber in said firing position and including a firing element movable between cocked and released positions, means biasing said firing element toward its released position, and a trigger operable to release said firing element from its cocked position, means for moving said indexing cams and for moving said firing element to its cocked position in response to said movement of said barrel including a rod connected to said barrel and engageable with said firing means rearward of said magazine and a plurality of indexing cams mounted in fixed position on said rod for engaging said cam tracks, and manually operable means for moving said firing element to said cocked position including a reciprocally movable grip assembly operable to move said barrel in one direction, said barrel being movable independenty of said grip assembly.
Dependencies are inferred from the claim text.