Automatic hand firearm

DETAILED DESCRIPTION I claim: 1.
An automatic hand firearm comprising a body including a handle, a barrel connected to the body, a breech block disposed within the body, a guide disposed within the body for guiding the breech block in sliding movement, biasing means for urging the breech block forwardly with respect to the barrel, said guide including an inclined guiding surface that extends upwardly and rearwardly at an acute angle with respect to the axis of the barrel and extends forwardly of the handle, said breech block when in its forward position having its center of gravity located forwardly of the handle, so that the breech block when moving rearwardly due to recoil produces a moment acting forward of the fulcrum point to force the barrel downwardly to counteract the moment tending to lift the barrel upwardly.
2.
The firearm of claim 1, wherein the center of gravity of said breech block is located forwardly of the rear end of the barrel when the breech block is in its forward position.
3.
The firearm of claim 1, wherein said breech block has an upwardly and rearwardly extending surface disposed to cooperate with said guiding surface when the rearwardly directed recoil force acts on said breech block.
4.
The firearm of claim 1, in which the forward end of the breech block is formed with a central bore to receive the rear end of the said barrel.
5.
The firearm of claim 1, wherein said guide includes a second guiding surface extending forwardly of said first guiding surface and disposed at a greater acute angle to said axis than said first guiding surface, said breech block including a first face extending upwardly and rearwardly at an acute angle with respect to said axis and disposed to mate with said first guiding surface, and said breech block having a second face extending forwardly of said first face and disposed at a greater acute angle than said first face and disposed to mate with said second surface.




Description:
The present invention concerns an automatic hand firearm