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US 4,856,410 AGranted
Firearm
OwnerJohn A. Andersoninventor
Life of this patent
Estimating the term…
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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 acutated 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 magazine comprising a cylindrical magazine drum having a cylindrical drum surface and 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 sets of cam recesses including a front cam recess opening radially outward through said cylindrical drum surface and through said front wall and defining a front cam track, each of said sets of cam recesses including a rear cam recess independent of said front cam recess and opening radially outward through said cylindrical drum surface and through said rear wall, each said front cam recess increasing in width from its rear end toward its front end, each portion of said front cam recess having a width at least equal to the width of the immediately preceding portion of said front cam recess in progressing from the rear end of said front cam recess to the front end thereof, each said rear cam recess increasing in width from its front end toward its rear end, each portion of said rear cam recess having a width at least equal to the immediately preceding portion of said rear cam recess in progressing from the front end of said rear cam recess to the rear end thereof.
A magazine comprising a cylindrical magazine drum having a cylindrical surface and front and rear walls, said drum having a coaxial central bore opening through at least said front wall, said drum defining a circumaxial series of firing chambers opening through said rear wall, a circumaxial series of conically tapered forwardly diverging barrel receiving chambers equal in number to said firing chambers and opening through said front wall, each of said barrel receiving chambers being coaxially aligned and in communication with an associated one of said firing chambers, and a circumaxial series of sets of cam recesses equal in number to said firing chambers, each of said sets of cam recesses including a front cam recess and a rear cam recess independent of said front cam recess, each said front cam recess opening through said front wall and radially outwardly through said cylindrical surface and having angularly opposed wall surfaces defining a front cam track, each said rear cam recess opening radially outwardly through said cylindrical surface and through said rear wall and having angularly opposed wall surfaces diverging from the front end of said rear cam recess toward said rear wall and defining a rear cam track, each portion of said rear cam recess having a width greater than the width of the immediately preceding portion of said rear cam recess in preceding from the front end of said rear cam recess to the rear end thereof.
A magazine comprising a cylindrical magazine drum having a cylindrical surface and front and rear walls said magazine drum 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 recesses having angularly opposed wall surfaces defining a cam track, each of said sets including a rear cam recess opening radially outward through said cylindrical surface and through said rear wall and a front cam recess opening radially outward through said cylindrical surface and through said front wall, each rear cam recess defining a rear cam track having a first portion extending inwardly from said rear wall toward said front wall and in a direction parallel to the axis of said magazine drum and a second portion extending outwardly from the inner end of said first portion and in one angular direction away from said first portion, each front cam recess defining a front cam track including a third portion extending inwardly toward said rear wall and in a direction parallel to said axis, a fourth portion parallel to said third portion and spaced from said third portion in said one angular direction, and a fifth portion extending from the front end of said fourth portion toward said front wall and in said one angular direction away from said fourth portion.
A magazine comprising a cylindrical magazine drum having a cylindrical surface and front and rear walls, said drum having a coaxial central bore including a cylindrical portion and a conically tapered portion diverging from said cylindrical portion toward said front wall and opening through said front wall, said drum defining a circumaxial series of cylindrical firing chambers, each of said firing chambers extending in a direction parallel to the axis of said central bore and opening through said rear wall, a circumaxial series of conically tapered forwardly diverging barrel receiving chambers equal in number to said firing chambers, each of said barrel receiving chambers being coaxially aligned with and communicating with an associated one of said firing chambers, a circumaxial series of sets of cam recesses equal in number to said firing chambers, each of said recesses having angularly opposed wall surfaces defining a cam track, each of said sets of cam recesses including a rear cam recess opening radially outward through said cylindrical surface and through said rear wall and a front cam recess opening radially outward through said cylindrical surface and through said front wall, each rear cam recess defining a rear cam track having a first portion extending from said rear wall toward said front wall and in a direction parallel to the axis of said magazine drum and a second portion extending from the front end of said first portion toward said rear wall and in one angular direction away from said first portion, each front cam recess defining a front cam surface including a third portion extending toward said rear wall and in a direction parallel to said axis, a fourth portion parallel to said third portion and spaced from said third portion in said one angular direction, and a fifth portion extending from the front end of said fourth portion toward said front wall and in said one angular direction away from said fourth portion.
A magazine comprising a cylindrical magazine drum having a cylindrical surface and front and rear walls, said drum having a coaxial bore opening through said front wall, said drum 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 sets including independent front and rear cam recesses, each of said front cam recesses opening radially through said cylindrical surface and through said front wall and defining a front cam track, each of said rear cam recesses opening radially outwardly through said cylindrical surface and through said rear wall and having angularly opposed wall surfaces diverging from the front end of said rear recess toward said rear wall and defining a rear cam track, said rear cam recess progressively increasing in width from said front end to said rear end thereof.
Dependencies are inferred from the claim text.