Roller and bearing delayed firearm operating systems

Patent metadata

Field	Value
Publication number	US-11543195-B2
Application number	US-202117367288-A
Country	US
Kind code	B2
Filing date	Jul 2, 2021
Priority date	Jul 3, 2020
Publication date	Jan 3, 2023
Grant date	Jan 3, 2023

Abstract

A firearm operating system includes a forward bolt with an internal cavity, a carrier disposed on a rear side of the forward bolt where the carrier includes a cavity, a short cam pin, a plurality of bearings, a retracted configuration, and a deployed configuration. At least a portion of a forward section of the short cam pin is disposed within the internal cavity of the forward bolt. At least a portion of a rear section of the short cam pin is disposed within the cavity of the carrier. Movement from the retracted configuration to the deployed configuration includes movement in a forward/aft direction of the short cam pin relative to the forward bolt and movement of the plurality of bearings.

First claim

That which is claimed is:

1. A firearm operating system comprising:
a forward bolt comprising an internal cavity;
a carrier disposed on a rear side of the forward bolt, wherein the carrier comprises a cavity;
a cam pin;
a plurality of bearings;
a bolt extension that mechanically attaches to the forward bolt and extends rearward from the forward bolt, the bolt extension being disposed rearward of a forward end of the carrier;
a retracted configuration; and
a deployed configuration, wherein:
the bolt extension forms a continuous lower surface with the forward bolt
at least a portion of a forward section of the cam pin is disposed within the internal cavity of the forward bolt;
at least a portion of a rear section of the cam pin is disposed within the cavity of the carrier; and
movement between the retracted configuration and the deployed configuration includes movement in a forward/aft direction of the cam pin relative to the forward bolt and movement of the plurality of bearings.

2. The firearm operating system of claim 1 , wherein, in the retracted configuration, the carrier is offset rearward away from the forward bolt.

3. The firearm operating system of claim 2 , wherein movement from the retracted configuration to the deployed configuration comprises moving the carrier forward closer to the forward bolt.

4. The firearm operating system of claim 1 , wherein the plurality of bearings comprises at least two bearings and the movement of the at least two bearings is in a direction that is nonparallel with the forward/aft direction.

5. The firearm operating system of claim 1 , wherein each of the plurality of bearings comprises:
an internal configuration wherein each bearing is internal to the forward bolt and does not extend beyond an outer surface of the forward bolt; and
an extended configuration wherein at least a portion of each bearing extends beyond an outer surface of the forward bolt.

6. The firearm operating system of claim 1 , wherein each of the plurality of bearings comprises at least one selected from the group of a sphere or a cylinder.

7. The firearm operating system of claim 1 , wherein a forward end of the cam pin comprises a plurality of ramp surfaces that interface with the plurality of bearings when the cam pin moves forward relative to the forward bolt.

8. The firearm operating system of claim 1 , wherein movement from the deployed configuration toward the retracted configuration creates a delay during operation of the firearm operating system.

9. The firearm operating system of claim 1 , wherein:
the forward bolt comprises at least one protrusion;
the carrier comprises at least one corresponding protrusion;
when the forward bolt and carrier are in a first configuration relative to one another, the at least one protrusion of the forward bolt engages the corresponding at least one protrusion of the carrier to limit relative movement between the forward bolt and the carrier in the forward/aft direction; and
when the forward bolt and carrier are in a second configuration relative to one another, the at least one protrusion of the forward bolt is disengaged from the corresponding at least one protrusion of the carrier such that the forward bolt and the carrier not constrained relative to one another in the forward/aft direction.

10. The firearm operating system of claim 1 , wherein:
the cam pin comprises at least one connection feature, wherein the at least one connection feature is selected from the group of a slot or a lug;
the carrier comprises at least one corresponding feature that engages the connection feature of the cam pin;
when the cam pin and carrier are in a first configuration relative to one another, the at least one connection feature engages the at least one corresponding feature to limit relative movement between the cam pin and the carrier in the forward/aft direction; and
when the cam pin and carrier are in a second configuration relative to one another, the at least one connection feature is disengaged from the at least one corresponding feature such that the cam pin and the carrier are not constrained relative to one another in the forward/aft direction.

11. The firearm operating system of claim 1 , further comprising at least one retaining rod that extends in the forward/aft direction, wherein each at least one retaining rod interfaces with one bearing of the plurality of bearings to limit movement of the bearing toward an extended configuration.

12. The firearm operating system of claim 1 , wherein the firearm operating system is compatible with a milspec AR-15 upper receiver.

13. A firearm operating system comprising:
a forward bolt comprising an internal cavity;
a carrier disposed on a rear side of the forward bolt, wherein the carrier comprises a cavity;
a cam pin;
a plurality of bearings;
a barrel extension;
a bolt extension configured to engage with the forward bolt and that extends rearward from the forward bolt such that the bolt extension is disposed rearward of a forward end of the carrier;
a retracted configuration; and
a deployed configuration, wherein:
at least a portion of a forward section of the cam pin is disposed within the internal cavity of the forward bolt;
at least a portion of a rear section of the cam pin is disposed within the cavity of the carrier; and
movement between the retracted configuration and the deployed configuration includes movement of the plurality of bearings.

14. The firearm operating system of claim 13 , wherein the deployed configuration comprises engagement between (i) at least one of the plurality of bearings and (ii) a corresponding feature of the barrel extension.

15. The firearm operating system of claim 13 , wherein movement from between the retracted configuration and the deployed configuration further comprises movement in a forward/aft direction of the cam pin relative to the forward bolt.

16. The firearm operating system of claim 13 , wherein:
the plurality of bearings comprises at least two bearings;
the movement of the at least two bearings is in a direction that is nonparallel with a forward/aft direction;
each of the plurality of bearings comprises:
an internal configuration wherein each bearing is internal to the forward bolt and does not extend beyond an outer surface of the forward bolt; and
an extended configuration wherein at least a portion of each bearing extends beyond an outer surface of the forward bolt.

17. The firearm operating system of claim 13 , wherein a forward end of the cam pin comprises a plurality of ramp surfaces that interface with the plurality of bearings when the cam pin moves forward relative to the forward bolt.

18. The firearm operating system of claim 13 , wherein movement from the deployed configuration toward the retracted configuration creates a delay during operation of the firearm operating system.

19. The firearm operating system of claim 13 , further comprising at least one retaining rod that extends in a forward/aft direction, wherein each at least one retaining rod interfaces with one bearing of the plurality of bearings to limit movement of the bearing toward an extended configuration.

20. A firearm operating system comprising:
a forward bolt comprising an internal cavity and at least one protrusion;
a carrier disposed on a rear side of the forward bolt, wherein the carrier comprises a cavity and at least one corresponding protrusion;
a cam pin;
a plurality of bearings;
a retracted configuration; and
a deployed configuratio

Assignees

• Underwood James Matthew
• Underwood Larry Cullen

Inventors

• Underwood James Matthew
• Underwood Larry Cullen

Classifications

• F41A3/62 Primary

  using combustion gas pressure for adding to the mechanical locking action, or for delaying breech opening movement · CPC title