Rear trunnion and folding stock fitting assemblies

Patent metadata

Field	Value
Publication number	US-10088265-B2
Application number	US-201715428672-A
Country	US
Kind code	B2
Filing date	Feb 9, 2017
Priority date	Feb 9, 2016
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

A rear trunnion assembly includes: a modular rear trunnion fitting including a rear connection feature, an upper portion, and a lower portion; a folding hinge fitting including an upper lug, a lower lug, and a forward portion disposed under the modular rear trunnion fitting, the folding hinge fitting disposed on a rear side of the modular rear trunnion fitting, the forward portion including a first mounting hole configured to interface with the upper portion and a second mounting hole configured to interface with the lower portion; and a pivoting latch fitting configured to pivot with respect to the folding hinge fitting about an axis extending from the upper lug to the lower lug. The pivoting latch fitting may be configured to lock in at least one position with respect to the folding hinge fitting.

First claim

That which is claimed is:

1. A rear trunnion assembly for a firearm, the rear trunnion assembly comprising:
a modular rear trunnion fitting attached to a rear portion of a receiver of the firearm, the modular rear trunnion fitting comprising a rear connection feature, an upper portion, and a lower portion;
a folding hinge fitting including an upper lug, a lower lug, and a forward portion disposed within the receiver under the modular rear trunnion fitting, the folding hinge fitting disposed on a rear side of the modular rear trunnion fitting, the forward portion including a first mounting hole configured to interface with the upper portion and a second mounting hole configured to interface with the lower portion;
a pivoting latch fitting attached to a forward portion of a stock of the firearm, the pivoting latch fitting configured to pivot with respect to the folding hinge fitting about an axis extending from the upper lug to the lower lug; and
a push button arm comprising an engaging arm, wherein:
the pivoting latch fitting is configured to lock in at least one position with respect to the folding hinge fitting; and
the folding hinge fitting comprises at least one surface that is continuous with an outer surface of the receiver.

2. The rear trunnion assembly of claim 1 , wherein:
the modular rear trunnion fitting is a modular split rear trunnion fitting that comprises a first arm and a second arm, which are separated by an open space, wherein the first and second arms each extend toward a front of the receiver;
the pivoting latch fitting comprises an engagement slot; and
the pivoting latch fitting is configured to lock in a deployed configuration due to an engagement of the engaging arm with the engagement slot.

3. The rear trunnion assembly of claim 2 , wherein:
the pivoting latch fitting comprises at least one protrusion disposed adjacent to the axis;
the at least one protrusion is configured to lock the pivoting latch fitting in a folded configuration; and
the at least one protrusion comprises a leading face and a trailing face.

4. The rear trunnion assembly of claim 3 , wherein rotation of the pivoting latch fitting toward the folded configuration causes the leading face to apply pressure against the push button arm.

5. The rear trunnion assembly of claim 3 , wherein the pressure against the push button arm causes the push button arm to move such that the pivoting latch fitting pivots to a fully folded position.

6. The rear trunnion assembly of claim 3 , wherein rotation of the pivoting latch fitting away from a fully folded position causes the trailing face to apply pressure against the push button arm.

7. The rear trunnion assembly of claim 1 , further comprising a button, wherein the button is configured to rotate and cause the push button arm to move in a lateral direction.

8. The rear trunnion assembly of claim 7 , wherein:
the push button arm comprises a sleeve on an opposite side of the push button arm from the engaging arm; and
the lateral direction is guided by the sleeve.

9. The rear trunnion assembly of claim 7 , wherein:
the push button arm comprises a protrusion;
the pivoting latch fitting comprises a protrusion;
lateral movement of the push button arm causes the protrusion of the push button arm to apply a force to the protrusion of the pivoting latch fitting; and
the force causes the pivoting latch fitting to pivot with respect to the folding hinge fitting about the axis.

10. The rear trunnion assembly of claim 1 , wherein:
the folding hinge fitting comprises a cavity; and
the rear connection feature is disposed within the cavity.

11. The rear trunnion assembly of claim 1 , wherein, when the folding hinge fitting is uninstalled, the rear connection feature is configured to engage a removable tang.

Assignees

• Underwood James Matthew
• Underwood Larry Cullen

Inventors

• Underwood James Matthew
• Underwood Larry Cullen

Classifications

• F41C23/20

  Butts; Butt plates; Mountings therefor (F41C23/08, F41C23/10, {F41C23/14} take precedence) · CPC title

• F41C23/04 Primary

  Folding or telescopic stocks or stock parts (articulated or collapsible guns F41A11/04) · CPC title

• F41A3/66

  Breech housings or frames; Receivers · CPC title