# US 10,866,041 B2 · Automatic firearm breech mechanism

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- Number: US 10,866,041 B2
- Document ID: US10866041B2
- Status: Granted
- Kind: B2
- Application number: 16/468,076
- Filed: 2017-12-21
- Published: 2020-03-05
- Granted: 2020-12-15
- Earliest claimed: 2016-12-22
- Applicants: Viktor Michut
- Inventors: Viktor Michut
- Web page: https://patentgrep.com/patent/US10866041B2

## CPC

- F41A 3/44: having sliding locking elements, e.g. balls, rollers
- F41A 5/02: recoil-operated
- F41A 3/46: mounted on the bolt (F41A3/48 takes precedence)
- F41A 3/66: Breech housings or frames; Receivers
- F41A 3/54: Bolt locks of the unlocked type, i.e. being inertia operated
- F41A: FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE

## Abstract

An automatic firearm breech mechanism is provided that ensures that the delaying roller remains an integral part of the breech mechanism after removing the breech mechanism from the firearm. The automatic firearm breech mechanism may include a breech, a breech carrier, and a delaying roller that is positioned between a rear vertical wall of the breech and a front vertical wall of the breech carrier. The delaying roller may move vertically while between the rear vertical wall of the breech and the front vertical wall of the breech carrier. A modified cage may surround the working area of the delaying roller. The cage may be a strip bent into the shape of an inverted letter “U,” featuring an opening located on its horizontal wall, while its vertical walls are fitted with a slide stop at both ends.

## Claims

### Claim 1

An automatic firearm breech mechanism, comprising:
a breech comprising a rear wall;
a breech carrier comprising a front wall;
a delaying roller positioned between the rear wall of the breech and the front wall of the breech carrier, the delaying roller configured to move in a working area; and
a cage surrounding the working area of the delaying roller, wherein
the cage prevents the delaying roller from falling out when the firearm is disassembled,
the cage comprises a bent strip in a shape of an inverted letter “U”,
the bent strip comprises a horizontal wall and two vertical walls,
the horizontal wall comprises an opening,
each of the vertical walls are fitted with a slide stop at both ends, and
a width of the opening is smaller than a diameter of the delaying roller.

### Claim 2 (depends on 1)

The automatic firearm breech mechanism of claim 1, wherein the rear wall of the breech and the front wall of the breech carrier are vertical walls.

### Claim 3 (depends on 2)

The automatic firearm breech mechanism of claim 2, wherein the delaying roller moves vertically between the rear vertical wall of the breech and the front vertical wall of the breech carrier.

### Claim 4 (depends on 1)

The automatic firearm breech mechanism of claim 1, wherein the cage is located between the rear vertical wall of the breech and the front vertical wall of the breech carrier.

### Claim 5

A firearm breech mechanism, comprising:
a delaying roller configured to move in a working area; and
a cage surrounding the working area of the delaying roller, wherein
the cage prevents the delaying roller from falling out when the firearm is disassembled,
the cage comprises a bent strip in a shape of an inverted letter “U”,
the bent strip comprises a horizontal wall and two vertical walls,
the horizontal wall comprises an opening,
each of the vertical walls are fitted with a slide stop at both ends, and
a width of the opening is smaller than a diameter of the delaying roller.

### Claim 6 (depends on 5)

The firearm breech mechanism of claim 5, further comprising:
a breech comprising a rear wall; and
a breech carrier comprising a front wall, wherein
the delaying roller is positioned between the rear wall of the breech and the front wall of the breech carrier.

### Claim 7 (depends on 6)

The firearm breech mechanism of claim 6, wherein the rear wall of the breech and the front wall of the breech carrier are vertical walls.

### Claim 8 (depends on 7)

The firearm breech mechanism of claim 7, wherein the delaying roller moves vertically between the rear vertical wall of the breech and the front vertical wall of the breech carrier.

### Claim 9 (depends on 6)

The firearm breech mechanism of claim 6, wherein the cage is located between the rear vertical wall of the breech and the front vertical wall of the breech carrier.

### Claim 10

A firearm breech mechanism, comprising:
a breech comprising a rear wall;
a breech carrier comprising a front wall;
a delaying roller positioned between the rear wall of the breech and the front wall of the breech carrier, the delaying roller configured to move in a working area; and
a cage surrounding the working area of the delaying roller, the cage comprising a bent strip in a shape of an inverted letter “U”, wherein
the bent strip comprises a horizontal wall and two vertical walls,
the horizontal wall comprises an opening,
each of the vertical walls are fitted with a slide stop at both ends, and
a width of the opening is smaller than a diameter of the delaying roller.

### Claim 11 (depends on 10)

The firearm breech mechanism of claim 10, wherein the rear wall of the breech and the front wall of the breech carrier are vertical walls.

### Claim 12 (depends on 11)

The firearm breech mechanism of claim 11, wherein the delaying roller moves vertically between the rear vertical wall of the breech and the front vertical wall of the breech carrier.