Semi-automatic cartridge feeding system
View Patent ↗Systems, methods, and articles of manufacture for repeating and semi-automatic cone-breech firearm systems are provided. A semi-automatic cone-breech firearm system may, for example, comprise a tapered semi-automatic seven (7) or eight (8) lug bolt having a cartridge channel that facilitates engagement of an ammunition cartridge with a cartridge seat and/or a plunger-style ejector.
1. A firearm bolt assembly, comprising:
a bolt body comprising a first end and a second end, with the second end comprising a tapered breech block face;
a first locking-lug extending radially outward from the bolt body at the second end thereof and oriented at a first radial position along a circumference of the bolt body and occupying a first portion of the tapered breech block face;
a second locking-lug extending radially outward from the bolt body at the second end thereof and oriented at a second radial position along the circumference of the bolt body and occupying a second portion of the tapered breech block face;
a circularly-shaped cartridge seat recessed into the tapered breech block face such that the tapered breech block face extends axially outward from the cartridge seat by a first distance corresponding to a first portion of the circumference of the circularly-shaped cartridge seat, the first portion of the circumference of the circularly-shaped cartridge seat corresponding to a third portion of the tapered breech block face that is disposed between the first and second portions of the tapered breech block face on an upper region of the tapered breech block face;
a cartridge guide disposed within the tapered breech block face, the cartridge guide comprising a first end and a second end, the cartridge guide defining a fourth portion of the tapered breech block face that extends axially outward from the cartridge seat by a second distance corresponding to a second portion of the circumference of the circularly-shaped cartridge seat, the fourth portion of the tapered breech block face being disposed on an lower region of the tapered breech block face, wherein the second distance is less than the first distance; and
cartridge guide fillets disposed at each of the first and second ends of the cartridge guide and oriented at third and fourth radial positions along the circumference of the bolt body, respectively, the cartridge guide fillets defining two transition portions of the tapered breech block face, the transition portions being disposed between the third and fourth portions of the tapered breech block face.
2. The firearm bolt assembly of claim 1 , wherein the fourth portion of the tapered breech block face is further disposed between the first and second radial positions of the locking lugs.
3. The firearm bolt assembly of claim 1 , further comprising:
a plunger-style ejector disposed within the circularly-shaped cartridge seat.
4. The firearm bolt assembly of claim 3 , further comprising:
an ejector spring coupled to exert a spring force on the plunger-style ejector.
5. The firearm bolt assembly of claim 1 , wherein the fourth portion of the tapered breech block face is further disposed between the first and second portions of the tapered breech block face.
6. The firearm bolt assembly of claim 1 , wherein the fourth portion of the tapered breech block face comprises the first and second portions of the tapered breech block face.
7. The firearm bolt assembly of claim 1 , further comprising:
a third locking-lug extending radially outward from the bolt body at the second end thereof and oriented at a fifth radial position along the circumference of the bolt body and occupying a fifth portion of the tapered breech block face; and
a fourth locking-lug extending radially outward from the bolt body at the second end thereof and oriented at a sixth radial position along the circumference of the bolt body and occupying a sixth portion of the tapered breech block face,
wherein the cartridge guide fillets at the third and fourth radial positions along the circumference of the bolt body are disposed, respectively, between the first locking-lug oriented at the first radial position along the circumference of the bolt body and the third locking-lug oriented at the fifth radial position along the circumference of the bolt body, and the second locking-lug oriented at the second radial position along the circumference of the bolt body and the fourth locking-lug oriented at the sixth radial position along the circumference of the bolt body.
8. The firearm bolt assembly of claim 1 , further comprising:
a cartridge extractor seated in an extractor channel of the bolt body.
9. The firearm bolt assembly of claim 8 , wherein the firearm bolt assembly comprises a semi-automatic firearm bolt assembly, further comprising:
third, fourth, fifth, sixth, and seventh locking lugs emanating from the bolt body near the second end thereof.
10. The firearm bolt assembly of claim 9 , wherein the cartridge extractor comprises angled sides seated between two of the seven locking lugs.
11. The firearm bolt assembly of claim 9 , further comprising:
an eighth locking lug emanating from the bolt body near the second end thereof.
12. The firearm bolt assembly of claim 11 , wherein the cartridge extractor comprises a locking lug sleeve through which one of the eight locking lugs projects.
13. The firearm bolt assembly of claim 11 , wherein the cartridge extractor comprises angled sides seated between two of the eight locking lugs.
14. The firearm bolt assembly of claim 1 , further comprising:
a firing pin assembly inserted into the bolt body from the first end.
15. The firearm bolt assembly of claim 1 , further comprising:
a bolt carrier in which the bolt body is disposed.
16. A firearm bolt assembly, comprising:
a bolt body comprising a first end and a second end, with the second end comprising a tapered breech block face;
a cartridge guide disposed within the tapered breech block face, the cartridge guide comprising a first end and a second end; and
cartridge guide fillets disposed at each of the first and second ends of the cartridge guide,
wherein the firearm bolt assembly comprises a semi-automatic firearm bolt assembly, and further comprises:
a cartridge extractor seated in an extractor channel of the bolt body;
eight locking lugs emanating from the bolt body near the second end thereof; and
wherein the cartridge extractor comprises a locking lug sleeve through which one of the eight locking lugs projects.
17. A firearm bolt assembly, comprising:
a bolt body comprising a first end and a second end, with the second end comprising a tapered breech block face;
a cartridge guide disposed within the tapered breech block face, the cartridge guide comprising a first end and a second end; and
cartridge guide fillets disposed at each of the first and second ends of the cartridge guide,
wherein the firearm bolt assembly comprises a semi-automatic firearm bolt assembly, and further comprises:
a cartridge extractor seated in an extractor channel of the bolt body;
seven locking lugs emanating from the bolt body near the second end thereof; and
wherein the cartridge extractor comprises a wide-flange, said wide-flange being defined by two symmetric rectangular transverse projections emanating from the body of the cartridge extractor.