Patent ID: 8505525
Filing Date: 2013-08-13
Classification: F41A,F41B

Abstract:
1. A gas-operated gun mechanism comprising: a bolt which is reciprocable in a cylinder between positions opening and closing communication between a source of compressed gas behind the bolt and an interior of a barrel forward of the bolt, wherein the bolt is adapted to be positioned to expel a paintball from the barrel when in a forward position; communication between the source of compressed gas and the rear of the bolt being through a firing chamber of the cylinder behind the bolt, wherein between said source and the rear of the bolt a valve is provided which is biased to a closed position in which it closes communication between said source and the firing chamber but which is displaced by the bolt to a rearward valve position during a movement of the bolt to a rearward position of the bolt, thereby re-charging the firing chamber; wherein the bolt contacts the valve when the bolt is in the rearward position, and wherein the bolt does not contact the valve when the bolt is in the forward position; and wherein the bolt is moved forward to a firing position compressed gas from the firing chamber and is retracted from the firing position by admission of compressed gas to an annular chamber between a periphery of the bolt and the cylinder.