# US 8,739,770 B2 · Compressed gas-powered projectile accelerator

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- Number: US 8,739,770 B2
- Document ID: US8739770B2
- Status: Granted
- Kind: B2
- Application number: 13/488,067
- Filed: 2012-06-04
- Published: 2013-04-18
- Granted: 2014-06-03
- Earliest claimed: 2002-03-06
- Assignees: KEE Action Sports I LLC
- Applicants: Robert K. Masse
- Inventors: Robert K. Masse
- Web page: https://patentgrep.com/patent/US8739770B2

## CPC

- F41B 11/71: Electric or electronic control systems, e.g. for safety purposes
- F41B 11/57: Electronic or electric systems for feeding or loading (F41B11/53 takes precedence)
- F41B 11/72: Valves; Arrangement of valves
- F41B 11/721: for controlling gas pressure for both firing the projectile and for loading or feeding
- F41B 11/723: for controlling gas pressure for firing the projectile only
- F41B 11/73: Sealing arrangements; Pistons
- F41B: WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR (projectiles for fishing, e.g. fish-spears, A01K81/00; sports implements for throwing A63B65/00, e.g. boomerangs A63B65/08; stationary apparatus for projecting sports balls, e.g. tennis balls, A63B69/40; throwing or slinging toys A63H33/18; knives, axes B26B; projectiles or missiles other than those incorporating springs as projecting means F42B6/00)

## Abstract

A pneumatic assembly for a paintball gun is provided. The pneumatic assembly includes a valve stem, and a bolt slidably mounted on the valve stem. The bolt includes at least one bolt port arranged through a sidewall of the bolt. A sealing member is provided on the valve stem in communication with an inner surface of the bolt. The bolt slides from a rearward position to a forward position along the valve stem. Compressed gas flows through the bolt port and through the bolt aperture to fire a projectile when the bolt is in the forward position. A paintball gun incorporating the pneumatic assembly is also provided.

## Claims

### Claim 1

A compressed gas gun, comprising:
a stationary housing including a compressed gas receiving portion configured to receive compressed gas from a source of compressed gas;
a housing passage arranged within the housing;
a bolt having a bolt passage slidably arranged within the housing passage moveable between a rearward position and a forward position, the bolt having a bolt opening in a forward portion of the bolt, wherein movement of the bolt relative to the housing from the rearward position to the forward position opens a flow path providing communication between the compressed gas receiving portion of the housing and the bolt opening, the bolt having an increased diameter portion adjacent its rearward end; and
a valve providing selective communication between a source of compressed gas and a forward facing portion of the bolt to move the bolt to a rearward position.

### Claim 2 (depends on 1)

The paintball gun of claim 1, wherein a stationary housing extension portion extends from a rear portion of the passage and is received in the bolt passage adjacent a rear portion of the bolt.

### Claim 3 (depends on 2)

The compressed gas-powered gun of claim 2, wherein the housing extension further comprises a plurality of holes, the holes providing communication between the compressed gas receiving portion and the bolt passage.

### Claim 4 (depends on 1)

The paintball gun of claim 1, wherein a sealing member is provided in the housing configured to prevent the bolt opening from receiving compressed gas from the compressed gas receiving portion when the bolt is in a rearward position to allow the bolt opening to receive compressed gas from the compressed gas receiving portion when the bolt is in a forward position.

### Claim 5 (depends on 4)

The compressed gas-powered gun of claim 4, wherein the sealing member is provided on an outer surface of the stationary housing extension portion and is in contact with an inner surface of the bolt.

### Claim 6 (depends on 1)

The compressed gas-powered gun of claim 1, wherein the valve is electronically actuated.

### Claim 7 (depends on 6)

The compressed gas-powered gun of claim 6, further comprising a control circuit for controlling a firing operation of the gun.

### Claim 8 (depends on 7)

The compressed gas-powered gun of claim 7, wherein the control circuit comprises a pressure sensor.