Firearm bolt action and extractor

A bolt assembly, for a firearm, for firing a cartridge, said bolt assembly comprising:

• a receiver having an axis and including a cartridge firing chamber having a cylindrical interior wall;
• a bolt having an axis and longitudinally slidable in and rotatably arranged in said receiver movable between a cartridge loading position and a firing position, said bolt having a cylindrical body portion including a front portion having an elongated cross-section and a rear end;
• locking means formed on said interior wall defining a mortise opening dimensioned for allowing passage of said elongated front portion of said bolt into said cartridge firing chamber during movement of said bolt to said cartridge firing chamber and having a forward end, and for allowing rotational movement of said bolt in said mortise opening when said elongated front portion is in said cartridge firing chamber;
• and
• cooperating locking surfaces on the rear end of said front portion of said bolt and the forward end of said locking means are arranged at an angle relative to a plane perpendicular to the axis of said bolt and said receiver respectively and defining a conical shape for concentrically holding said bolt relative to said receiver and the angle of said forward end of said locking means relative to a plane perpendicular to the axis of said bolt being sufficient to divert forces caused when said cartridge is fired in said chamber.

A bolt assembly, for a firearm, for firing a cartridge, said bolt assembly comprising:

• a receiver having an axis and including a cartridge firing chamber having a cylindrical interior wall;
• a bolt having an axis and longitudinally slidable in and rotatably arranged in said receiver movable between a cartridge loading position and a firing position, said bolt having a cylindrical body portion including a front portion having an elongated cross-section and a rear end;
• locking means formed on said interior wall defining a mortise opening dimensioned for allowing passage of said front portion of said bolt into said cartridge firing chamber during movement of said bolt to said cartridge firing chamber, and having a forward end and for allowing rotational movement of said bolt in said mortise opening when said front portion is in said cartridge firing chamber;
• and
• cooperating locking surfaces on the rear end of said elongated front portion of said bolt and the forward end of said locking means being generally conically shaped and dimensioned for concentrically supporting said bolt relative to said receiver when said bolt is in said firing position.

A bolt assembly, for a firearm, for firing a cartridge, said bolt assembly comprising:

• a receiver including a cartridge firing chamber having a cylindrical interior wall;
• a bolt longitudinally slidable in and rotatably arranged in said receiver movable between a cartridge loading position and a firing position, said bolt having a cylindrical body portion including a front portion having a rear end and an elongated cross-section;
• locking means formed on said interior wall having a forward end defining a mortise opening dimensioned for allowing passage of said front portion of said bolt into said chamber during movement of said bolt to said cartridge firing chamber, and for allowing rotational movement of said bolt in said mortise opening when said front portion is in said cartridge firing chamber;
• cooperative locking surfaces on the rear end of said front portion of said bolt and the forward end of said locking means for concentrically supporting said bolt relative to said receiver when said bolt is in said firing position;
• a locking wall at the forward end, said locking means being conically shaped and thus at an angle relative to a plane perpendicular to the axis of cylindrical interior wall;
• and
• whereby during rotation of said bolt in said firing position said locking surface on said bolt at the rear end of said front portion engages said locking wall at the forward end of said locking means to cam said bolt into firing position and concentrically align the axis of said bolt and said receiver.

A bolt assembly, for a firearm, for firing a cartridge, said bolt assembly comprising:

• a receiver including a cartridge firing chamber having a cylindrical interior wall;
• a bolt longitudinally slidable in and rotatably arranged in said receiver movable between a cartridge loading position and a firing position, said bolt having a cylindrical body portion including a front portion having a rear end and an elongated cross-section and a locking surface at the rear end of said elongated front portion;
• said locking surface being oriented at an angle relative to a plane perpendicular axis of said bolt;
• locking means formed on said interior wall having a forward end defining a mortise opening dimensioned for allowing passage of said elongated front portion of said bolt into said chamber during movement of said bolt to said cartridge firing chamber, and for allowing rotational movement of said bolt in said mortise opening when said elongated front portion is in said cartridge firing chamber;
• cooperative locking surfaces on the rear end of said elongate front portion of said bolt and the forward end of said locking means for concentrically supporting said bolt relative to said receiver when said bolt is in said firing position;
• a locking wall at the forward end, said locking means being oriented at an angle relative to a plane perpendicular to the axis of cylindrical interior wall;
• whereby during rotation of said bolt in said firing position said locking surface on said bolt at the rear end of said elongated front portion engages said locking wall at the forward end of said locking means to cam said bolt into firing position and concentrically align the axis of said bolt and said receiver;
• and
• said locking surface on said elongated front portion of said bolt and said locking wall on said locking means provide cooperating generally conically shaped supporting surfaces for concentrically supporting said bolt relative to said receiver.

A bolt assembly for a firearm, for firing a cartridge including a cartridge case, said bolt assembly comprising:

• a receiver including a chamber having a cylindrical interior wall;
• a bolt longitudinally slidable in and rotatably arranged in said receiver movable between a cartridge loading position and a cartridge firing position wherein said cartridge is in said chamber, said bolt having a cylindrical body portion including a front portion having an elongated cross-section and a locking surface at the rear end of said front portion;
• said locking surface being oriented at an angle relative to a plane perpendicular to the axis of said bolt;
• locking means formed on said interior wall defining a mortise opening dimensioned for allowing passage of said front portion of said bolt into said chamber, and for allowing rotational movement of said bolt while said front portion is in said chamber;
• a locking wall on said locking means being oriented at an angle relative to a plane perpendicular to the axis of said cylindrical interior wall;
• a recess formed in the axial end of said front portion for receiving said cartridge case;
• a peripheral extractor groove formed in said bolt extending longitudinally from a portion in said cylindrical body portion to the free end of said front portion;
• an extractor pivotally disposed in said groove having an outer surface conforming with the outer surface of said bolt between said cylindrical body portion and said front portion including a section forming part of said locking surface, a holding tab formed on said extractor head arranged for engaging said cartridge case in said recess;
• said extractor being biased in a first position in said groove in which said holding tab formed on the extractor head will yield to allow said cartridge case to be received in said recess when said bolt is in said firing position;
• whereby during rotation of said bolt in said firing position said locking surface on said bolt including said section of said extractor at the rear end of said front portion of said bolt intimately engage said locking wall at the forward end of said locking means to secure said bolt relative to said receiver with the axis of said bolt and receiver being concentric and prevent pivoting of said extractor to thereby retain said holding tab in engagement with said cartridge case in said firing position, and
• said locking surface on said front portion of said bolt and said locking wall on said locking means provide cooperating generally conically shaped supporting surfaces for concentrically supporting said bolt relative to said receiver.

A bolt assembly, for a firearm, for firing a cartridge including a cartridge case, said bolt assembly comprising:

• a receiver including a chamber having a cylindrical interior wall;
• a bolt longitudinally slidable in and rotatably arranged in said receiver movable between a cartridge loading position and a cartridge firing position wherein said cartridge is in said chamber, said bolt having a cylindrical body portion including a front portion having an elongated cross-section and a locking surface at the rear end of said front portion;
• said locking surface being oriented at an angle relative to a plane perpendicular to the axis of said bolt to form a conical shape;
• locking means formed on said interior wall defining a mortise opening dimensioned for allowing passage of said front portion of said bolt into said chamber, and for allowing rotational movement of said bolt while said front portion is in said chamber;
• a locking wall on said locking means being oriented at an angle relative to a plane perpendicular to the axis of said cylindrical interior wall;
• a recess formed in the axial end of said front portion for receiving said cartridge case;
• a peripheral extractor groove formed in said bolt extending longitudinally from a portion in said cylindrical body portion to the free end of said front portion;
• an extractor pivotally disposed in said groove having an outer surface conforming with the outer surface of said bolt between said cylindrical body portion and said front portion including a section forming part of said locking surface, a holding tab formed on said extractor head arranged for engaging said cartridge case in said recess;
• said extractor being biased in a first position in said groove in which said holding tab formed on the extractor head will yield to allow said cartridge case to be received in said recess when said bolt is in said firing position;
• and
• whereby during rotation of said bolt in said firing position said locking surface on said bolt including said section of said extractor at the rear end of said front portion of said bolt intimately engage said locking wall at the forward end of said locking means to secure said bolt relative to said receiver with the axis of said bolt and receiver being concentric and prevent pivoting of said extractor to thereby retain said holding tab in engagement with said cartridge case in said firing position.