Firearm with gas drive

Patent metadata

Field	Value
Publication number	US-11927417-B2
Application number	US-202017754237-A
Country	US
Kind code	B2
Filing date	Oct 1, 2020
Priority date	Oct 4, 2019
Publication date	Mar 12, 2024
Grant date	Mar 12, 2024

Abstract

A firearm including a gas drive, having an annular piston which is displaceably arranged on the barrel to form an expansion chamber between two end positions. At least one gas port penetrates the wall of the barrel in the region of the expansion chamber and a selector is provided. In order to provide a simple and easily adjustable mechanism, the expansion chamber is delimited by a ring surface and an inner cylinder surface of the piston, an end surface of the selector and the barrel. The selector is rotatably arranged on the barrel with at least two predefined rest positions. In each rest position, the gas flow from the expansion chamber is delimitable by at least one selector opening formed on the selector.

First claim

The invention claimed is:

1. A firearm, comprising:
a frame;
a barrel having a barrel axis, the barrel being fixedly mounted to the frame;
a barrel extension that is connectable to the barrel;
a breech having a sliding piece; and
a gas drive configured to act on the sliding piece of the breech via one or more operating rods;
wherein the gas drive includes:
a selector, the selector being arranged on the barrel so as to be rotatable about the barrel;
an annular piston that is displaceably arranged on the barrel between a front resting position and a rear end position and which forms an expansion chamber, the expansion chamber being delimited by a ring surface and an inner cylinder surface of the annular piston, and an end surface of the selector and the barrel; where the annular piston is urged in a forward direction by one or more retaining springs; and
at least one gas port defined in a wall of the barrel in a region of the expansion chamber;
wherein the selector is rotatable about the barrel axis into at least two predefined rest positions, in which for each of the at least two predefined rest positions a gas flow from the expansion chamber into an environment is delimitable by at least one selector opening defined by the selector and a gas outlet channel of the piston.

2. The firearm according to claim 1 , wherein the selector has a rear portion and a front portion, the rear portion having a smaller diameter than the front portion;
when the piston is in the front resting position the piston is urged over the rear portion of the selector, and
the at least one selector opening is provided on the rear portion of the selector to adjust the gas flow from the expansion chamber into the gas outlet channel of the piston, and the selector has at least one exhaust defined in a transition region to the front portion of the selector, the exhaust being configured to discharge the gas flow from the gas outlet channel.

3. The firearm according to claim 1 , wherein the gas outlet channel of the piston is defined in the inner cylinder surface such that the gas outlet channel is delimited at its rear by an overflow edge.

4. The firearm according to claim 3 , wherein the gas outlet channel is defined so as to extend in a circumferential direction in an angular range from 5° to 90° on the inner cylinder surface of the piston.

5. The firearm according to claim 3 , wherein the gas outlet channel is defined so as to extend in a circumferential direction in an angular range from 10° to 30° on the inner cylinder surface of the piston.

6. The firearm according to claim 1 , wherein the barrel includes a flange-shaped band having at least two rest positions.

7. The firearm according to claim 1 , wherein a recess is defined in a surface of the barrel, the recess being defined as an elongated depression.

8. The firearm according to claim 1 , wherein the selector defines a rest bolt opening that extends radially inward in a direction of the barrel, the rest bolt opening being configured to receive a rest bolt; and the selector defines a spring opening that is formed parallel to the barrel axis, such that an opening of the spring opening points rearward and is used for receiving a plunger and a spring acting on the plunger.

9. The firearm according to claim 8 , wherein:
the plunger defines a slotted rest bolt receiver that is designed to receive and guide the rest bolt in an installation situation;
the rest bolt has a flattening on at least one side on a lateral surface of the rest bolt;
the rest bolt receiver defines a slot-shaped opening that extends rearwardly in a direction normal to the barrel axis from a hole configured to receive the rest bolt up to an end of the plunger and is designed in a transverse direction to match a diameter of the rest bolt in a region of its flattening; and
the plunger has a protruding cam on a lower face.

10. The firearm according to claim 9 , wherein a flange-shaped band of the barrel defines an adjoining stopper notch configured to receive and guide the cam on the lower face of the plunger.

11. The firearm according to claim 10 , wherein at least one stopper for defining a stop position is formed within the stopper notch.

12. The firearm according to claim 9 , further comprising a radially protruding operating element configured to receive the plunger, the spring, and the rest bolt; where the radially protruding operating element is formed on a front portion of the selector.

13. The firearm according to claim 8 , wherein a length of the plunger is selected so that in a spring-loaded installation situation a rear region of the plunger protrudes 2 to 20 mm rearwards out of the spring opening.

14. The firearm according to claim 8 , wherein a length of the plunger is selected so that in a spring-loaded installation situation a rear region of the plunger protrudes 5 to 10 mm rearwards out of the spring opening.

15. The firearm according to claim 1 , wherein the at least one selector opening defined by the selector comprises at least two selector openings each having different cross-sectional areas.

16. The firearm according to claim 1 , wherein the at least two predefined rest positions comprises at least three predefined rest positions and wherein the at least one selector opening comprises at least three selector openings, each of the at least three predefined rest positions having a corresponding selector opening of the at least three selector openings defined by the selector and the gas outlet channel of the piston, and the at least three selector openings have different cross-sectional areas.

17. The firearm according to claim 1 , wherein a protrusion formed at a front portion of the piston at least partially circumferentially encases the selector.

18. The firearm according to claim 17 , wherein the protrusion formed at the front portion of the piston circumferentially encases the selector over an arc of 90° that is centered on the gas outlet channel.

19. The firearm according to claim 17 , wherein the protrusion formed at the front portion of the piston circumferentially encases the selector over an arc of 180° that is centered on the gas outlet channel.

20. The firearm according to claim 17 , wherein the protrusion formed at the front portion of the piston circumferentially encases the selector over an arc of more than 180° that is centered on the gas outlet channel.

21. The firearm according to claim 1 , wherein when the annular piston is in the front resting position, the expansion chamber is fluidically separated from the gas outlet channel.

22. The firearm according to claim 1 , wherein when the annular piston is in the rear end position, the expansion chamber is fluidically connected to the gas outlet channel.

Assignees

• Glock Tech Gmbh

Inventors

• Kroyer Josef
• Bilgeri Elmar

Classifications

• F41A5/20 Primary

  using a gas piston arranged concentrically around the barrel · CPC title

• F41A5/28 Primary

  Adjustable systems · CPC title