Firearm having a dual cam, cock on close bolt action and a low creep sear and step trigger assembly
View Patent ↗A bolt action firearm that cocks the firing pin upon closing the bolt and includes a cam pin for a high velocity rimfire cartridge. In one embodiment, actuating the main spring while closing the bolt, instead of while opening the bolt, provides added safety against misfiring. A safety system is provided for the trigger mechanism and a robust connecting system for the stock.
1. A bolt action firearm, comprising:
a bolt assembly including:
a main body defining a central bore along a central axis and an elongate through-slot that passes through said main body;
a cam cylinder mounted to said main body, said cam cylinder defining a spiral-shaped slot that passes through said cam cylinder;
a handle portion coupled to said cam cylinder; and
a cam pin that extends perpendicular to said central axis, through said elongate through-slot of said main body, and through said spiral-shaped slot of said cam cylinder,
wherein rotation of said bolt assembly about said central axis with said handle portion causes said spiral slot of said cam cylinder to rotate about and exert an axial force that is parallel to said central axis against said cam pin, which causes a translation of said cam pin within said elongate through-slot of said main body.
2. The bolt action firearm of claim 1 , comprising:
a spring retainer coupled to said cam pin and slidably engaged within said central bore; and
a main spring disposed distal to and in contact with said spring retainer,
wherein rotation of said bolt assembly from an open position to a closed position causes said translation of said cam pin to exert a force on said spring retainer in a distal direction, which causes said spring retainer to move in said distal direction to apply a compressive force on said main spring.
3. The bolt action firearm of claim 1 , wherein said main body includes a neck portion that defines said elongate through-slot.
4. The bolt action firearm of claim 3 , wherein said cam cylinder is mounted to an external surface of said neck portion.
5. The bolt action firearm of claim 1 , comprising:
a trigger assembly; and
a barrel operatively coupled with said trigger assembly,
wherein said bolt assembly is operatively coupled to said trigger assembly and said barrel.
6. The bolt action firearm of claim 5 , comprising a housing attached to a proximal end of said barrel, said housing defining an actuation axis, said bolt assembly being disposed within said housing so that said central axis of said bolt assembly is substantially concentric with said actuation axis, said bolt assembly being translatable along said actuation axis.
7. The bolt action firearm of claim 6 , wherein:
said housing includes a plurality of inwardly extending retaining tab portions disposed at a proximal end thereof, each of said inwardly extending retaining tab portions including a distal face; and
said cam cylinder of said bolt assembly includes a plurality of outwardly extending tab portions, each of said outwardly extending tab portions including a proximal face,
wherein rotation of said bolt assembly from an open position to a closed position causes each said proximal face of said plurality of outwardly extending tab portions to rotate into contact with said distal face of a corresponding one said plurality of inwardly extending retaining tab portions of said housing to secure said bolt assembly within said housing.
8. The bolt action firearm of claim 7 , wherein said plurality of inwardly extending retaining tab portions include lead-in surfaces.
9. The bolt action firearm of claim 7 , wherein said plurality of outwardly extending tab portions include lead-in surfaces.
10. A cock-on-close bolt action firearm, comprising:
a bolt assembly including:
a main body defining central bore along a central axis and an elongate through-slot that passes through said main body;
a cam cylinder mounted to said main body, said cam cylinder defining a spiral-shaped slot that passes through said cam cylinder;
a spring retainer slidably engaged within said central bore;
a cam pin disposed in said spring retainer, said cam pin extending perpendicular to said central axis, through said elongate through-slot of said main body, and through said spiral-shaped slot of said cam cylinder; and
a main spring disposed distal to and in contact with said spring retainer,
wherein rotation of said bolt assembly about said central axis from an open position to a closed position causes said cam to exert a force on said cam pin in a distal direction, which causes said cam pin and said spring retainer to move in said distal direction to apply a compressive force on said main spring.
11. The cock-on-close bolt action firearm of claim 10 , wherein said main body includes a neck portion that defines said elongate through-slot.
12. The bolt action firearm of claim 11 , wherein said cam cylinder is mounted to an external surface of said neck portion.
13. A bolt action firearm, comprising:
a bolt assembly including:
a main body defining a central bore along a central axis;
a cam cylinder mounted to said main body, said cam cylinder defining a spiral-shaped slot;
a handle portion coupled to said cam cylinder;
a cam follower that engages said spiral-shaped slot of said cam cylinder;
a spring retainer coupled to said cam follower and slidably engaged within said central bore; and
a main spring disposed distal to and in contact with said spring retainer,
wherein rotation of said bolt assembly about said central axis with said handle portion causes said spiral slot of said cam cylinder to rotate about and exert an axial force that is parallel to said central axis against said cam follower, which causes a translation of said cam follower and said spring retainer.
14. The bolt action firearm of claim 13 ,
wherein rotation of said bolt assembly from an open position to a closed position causes said translation of said cam follower and said spring retainer to exert a force on said spring retainer in a distal direction, which causes said spring retainer to move in said distal direction to apply a compressive force on said main spring.
15. The bolt action firearm of claim 13 , wherein said spiral-shaped slot that passes through said cam cylinder.
16. The bolt action firearm of claim 13 , wherein said cam follower is a cam pin.
17. The bolt action firearm of claim 16 , wherein:
said main body defines an elongate through-slot that extends parallel to said central axis; and
said cam pin engages said elongate through-slot and said spiral-shaped slot.
18. The bolt action firearm of claim 17 , wherein said elongate through-slot passes through said main body, said cam pin passing through said elongate through-slot.
19. The bolt action firearm of claim 17 , wherein said spiral-shaped slot passes through a wall of said cam cylinder, said cam pin passing through said spiral-shaped slot.