Roller and bearing delayed firearm operating systems

Patent metadata

Field	Value
Publication number	US-12584701-B2
Application number	US-202418675295-A
Country	US
Kind code	B2
Filing date	May 28, 2024
Priority date	Jul 3, 2020
Publication date	Mar 24, 2026
Grant date	Mar 24, 2026

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 bolt comprising a rear cavity; a plurality of bearings disposed at least partially within the bolt; a carrier disposed on a rear side of the bolt, the carrier comprising a forward cavity; a cam pin comprising a forward section; and a bolt extension at least partially attached to a rear of the bolt,
wherein:
the forward section of the cam pin is disposed within the rear cavity of the bolt; and
the forward section of the cam pin comprises a plurality of forward surfaces that each correspond to one of the plurality of bearings.

2 . The firearm operating system of claim 1 , wherein each of the plurality of bearings comprises a spherical shape.

3 . The firearm operating system of claim 1 , wherein each of the plurality of bearings moves in a radial direction of the bolt.

4 . The firearm operating system of claim 1 , wherein:
the plurality of bearings comprises three bearings; the bolt comprises three cavities distributed around a perimeter of the bolt such that each bearing moves relative to the bolt through the respective cavity; and each cavity comprises a retaining portion that prevents the bearing from passing entirely through the cavity.

5 . The firearm operating system of claim 4 , further comprising a retracted bearing configuration and a deployed bearing configuration, wherein:
in the retracted bearing configuration the bearings are biased toward a center of the bolt and do not extend beyond an outer surface of the bolt; and in the deployed bearing configuration the bearings are biased away from the center of the bolt and do at least partially extend beyond the outer surface of the bolt.

6 . The firearm operating system of claim 1 , wherein each of the forward surfaces is oblique relative to a forward/aft direction of the firearm operating system.

7 . The firearm operating system of claim 1 , further comprising a barrel extension comprising a plurality of recesses that each corresponds to one of the plurality of bearings.

8 . The firearm operating system of claim 1 , further comprising at least one retaining rod, wherein each retaining rod restricts movement of one of the plurality of bearings and the at least one retaining rod is attached to a barrel extension.

9 . The firearm operating system of claim 1 , wherein a lower surface of the bolt and a lower surface of the bolt extension are approximately continuous.

10 . The firearm operating system of claim 1 , wherein the bolt extension comprises a hoop such that at least a portion of the cam pin passes through the hoop.

11 . A firearm operating system comprising:
a bolt comprising a rear cavity; at least two bearings disposed at least partially within the bolt; a carrier disposed on a rear side of the bolt, the carrier comprising a forward cavity; a bolt extension at least partially attached to a rear of the bolt; and a plurality of forward surfaces that each corresponds to one of the at least two bearings, wherein the bolt extension is rotatable relative to the bolt.

12 . The firearm operating system of claim 11 , further comprising a cam pin comprising a forward section and a rear section, wherein the cam pin is disposed between the bolt and the carrier.

13 . The firearm operating system of claim 12 , wherein:
the rear section of the cam pin is disposed within the forward cavity of the carrier; and the forward section of the cam pin comprises the plurality of forward surfaces that each correspond to one of the at least two bearings.

14 . The firearm operating system of claim 11 , wherein each of the at least two bearings comprises a spherical shape.

15 . The firearm operating system of claim 11 , wherein each of the at least two bearings moves in a radial direction of the bolt.

16 . The firearm operating system of claim 11 , wherein:
the at least two bearings comprise three bearings; and the bolt comprises three cavities distributed around a perimeter of the bolt such that each bearing moves relative to the bolt through the respective cavity.

17 . The firearm operating system of claim 11 , wherein each of the forward surfaces is oblique relative to a forward/aft direction of the firearm operating system.

18 . The firearm operating system of claim 11 , further comprising a barrel extension comprising a plurality of recesses that each corresponds to one of the at least two bearings.

19 . The firearm operating system of claim 11 , further comprising at least one retaining rod wherein each retaining rod restricts movement of one of the at least two bearings and the at least one retaining rod is attached to a barrel extension.

20 . The firearm operating system of claim 11 , wherein a lower surface of the bolt and a lower surface of the bolt extension are approximately continuous.

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