# US 11,112,197 B2 · Pivot pin

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- Number: US 11,112,197 B2
- Document ID: US11112197B2
- Status: Granted
- Kind: B2
- Application number: 17/117,205
- Filed: 2020-12-10
- Published: 2021-06-17
- Granted: 2021-09-07
- Earliest claimed: 2019-12-12
- Applicants: James Matthew Underwood; Larry Cullen Underwood
- Inventors: James Matthew Underwood; Larry Cullen Underwood
- Web page: https://patentgrep.com/patent/US11112197B2

## CPC

- F41A 11/00: Assembly or disassembly features; Modular concepts; Articulated or collapsible guns (F41A3/64, F41A19/10 - F41A19/15, F41A21/48, F41A25/26 take precedence)
- F41A 3/66: Breech housings or frames; Receivers
- F41A: FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE

## Abstract

A pivot pin for a firearm includes a proximal end, a distal end, a cylindrical surface extending between the proximal end and the distal end, a head disposed at the distal end where the head includes a flat portion, a groove extending along at least a portion of a length of the cylindrical surface, and a hole extending through the pivot pin. The hole is located between the groove and the proximal end.

## Claims

### Claim 1

A pivot pin for a firearm, the pivot pin comprising:
a proximal end;
a distal end;
a cylindrical surface extending between the proximal end and the distal end;
a head disposed at the distal end, the head comprising a flat portion;
a groove extending along at least a portion of a length of the cylindrical surface, the groove comprising a first recess and a second recess; and
a hole extending through the pivot pin, wherein the hole is located between the groove and the proximal end and the hole is designed for a detent to pass through the hole,
wherein at least one selected from the group of the first recess and the second recess comprises a through hole; and
wherein at least part of the through hole is smaller in diameter than the detent.

### Claim 2 (depends on 1)

The pivot pin of claim 1, wherein the hole comprises a bevel on at least one selected from the group of a first end and a second end of the hole.

### Claim 3 (depends on 1)

The pivot pin of claim 1, wherein an axial direction of the hole is approximately perpendicular to a location of the groove on the cylindrical surface.

### Claim 4 (depends on 1)

The pivot pin of claim 1, wherein:
the first recess is disposed at a first end of the groove;
the second recess is disposed at a second end of the groove;
the first end of the groove is disposed closer to the proximal end of the pivot pin; and
the second end of the groove is disposed closer to the distal end of the pivot pin.

### Claim 5 (depends on 1)

The pivot pin of claim 1, wherein at least one selected from the group of the first recess and the second recess comprises a blind hole.

### Claim 6 (depends on 1)

The pivot pin of claim 1, wherein a size of the hole is configured for the detent and a detent spring to pass through the hole.

### Claim 7 (depends on 6)

The pivot pin of claim 6, wherein the detent and the detent spring are configured to pass through the hole and into a detent hole of a receiver when the pivot pin is at least partially inserted into a front pin hole of the receiver.

### Claim 8 (depends on 1)

The pivot pin of claim 1, wherein the pivot pin comprises titanium.

### Claim 9

A pivot pin assembly for installation into a receiver of a firearm, the pivot pin assembly comprising:
a pivot pin;
a detent; and
a detent spring,
wherein the pivot pin comprises:
a proximal end;
a distal end;
a cylindrical surface extending between the proximal end and the distal end;
a groove extending along at least a portion of a length of the cylindrical surface, the groove comprising a first recess and a second recess; and
a hole extending through the pivot pin, wherein the hole is located between the groove and the proximal end,
wherein at least one selected from the group of the first recess and the second recess comprises a through hole; and
wherein at least part of the through hole is smaller in diameter than the detent.

### Claim 10 (depends on 9)

The pivot pin assembly of claim 9, wherein the hole comprises a bevel on at least one selected from the group of a first end and a second end of the hole.

### Claim 11 (depends on 9)

The pivot pin assembly of claim 9, wherein an axial direction of the hole is approximately perpendicular to a location of the groove on the cylindrical surface.

### Claim 12 (depends on 9)

The pivot pin assembly of claim 9, wherein a size of the hole is configured for the detent and the detent spring to pass through the hole.

### Claim 13 (depends on 9)

The pivot pin assembly of claim 9, wherein:
the first recess is disposed at a first end of the groove;
the second recess is disposed at a second end of the groove;
the first end of the groove is disposed closer to the proximal end of the pivot pin; and
the second end of the groove is disposed closer to the distal end of the pivot pin.

### Claim 14 (depends on 9)

The pivot pin assembly of claim 9, wherein at least one selected from the group of the first recess and the second recess comprises a blind hole.

### Claim 15 (depends on 9)

The pivot pin assembly of claim 9, further comprising an open configuration and a closed configuration, wherein:
the detent engages the first recess of the groove when the pivot pin assembly is in the open configuration; and
the detent engages the second recess of the groove when the pivot pin assembly is in the closed configuration.

### Claim 16 (depends on 9)

The pivot pin assembly of claim 9, wherein the pivot pin comprises titanium.

### Claim 17 (depends on 9)

The pivot pin assembly of claim 9, wherein the detent and the detent spring are configured to pass through the hole and into a detent hole of the receiver when the pivot pin is at least partially inserted into a front pin hole of the receiver.