Ordnance – Automatic – Receiver closures and/or breech block return means
Patent
1983-06-27
1986-02-11
Brown, David H.
Ordnance
Automatic
Receiver closures and/or breech block return means
89184, 89197, F41D 300
Patent
active
045692700
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns an automatic hand firearm.
BACKGROUND OF THE INVENTION
An automatic hand firearm wherein the backward path of motion of the breech block deviates upward from the barrel centre-line is known e.g. through the German application print No. 2 354 451. In this design of prior art in a conventional pistol, where the ammunition box is accommodated in the handle and the breech block has been placed substantially adjacent to the handle or on the rear side thereof, the motion path of the breech block has been disposed to be rearward obliquely ascending, the purpose being to shift the arm's centre of gravity and in particular the barrel as far down as possible so that the barrel might not rise upward when shooting. In practice, the breech block however causes on the rearward obliquely upward pointing breech block guide a downward urging moment behind the weapon's point of support, that is the handle, whereby the butt part of the weapon tends to turn downwards when shooting, which is manifested as a moment lifting the barrel upward. Therefore the effect of the construction is the opposite of that which was aimed at with the construction.
SUMMARY OF THE INVENTION
The object of the present invention is to eliminate the drawback mentioned. In particular, the object of the invention is to provide an automatic mass-obturated hand firearm where the barrel-lifting moment of the recoil has been maximally eliminated.
Regarding the characteristic features of the invention, reference is made to the claims section.
The invention is based on such arrangement of the breech block's centre of gravity and of the breech block guide, such that the breech block, when moving rearward due to the recoil, will give rise to a moment acting forward of this fulcrum point and turning the muzzle of the barrel downward. The said, favorable moment turning the barrel down is produced, as taught by the invention, by arrangements concerning the centre of gravity of the breech block with reference to the barrel and, in particular, to the pivoting point in the wrist of the hand holding the weapon, in such manner as has been stated in the claims.
DESCRIPTION OF THE DRAWINGS
The invention is described in detail in the following with the aid of embodiment examples, referring to the attached drawings, wherein:
FIG. 1 presents, schematically and partly sectioned, a weapon according to the invention, in elevational view,
FIG. 2 shows the breech block and barrel of the weapon of FIG. 1, in top view,
FIG. 3 presents the forward part of another embodiment of the invention, partly sectioned, and
FIG. 4 presents, schematically and partly sectioned, a third weapon according to the invention in elevational view.
DESCRIPTION OF THE ILLUSTRATED EMBODIMENT
The mass-obturated automatic pistol depicted in FIG. 1 comprises a body 1 with handle 2, a barrel 3 joined to the body, a breech block 4 with guide 5 constituted by the body and with return spring 6, and the cocking and firing mechanism 7 (in the figure the cocking and firing mechanism has not been shown, except for the trigger, in order to better illustrate the construction). The weapon furthermore comprises an ammunition box 17 placed forward of the trigger. The breech block 4 has been disposed to move mainly encircling the barrel in a guide constituted by the body of the weapon. The guide 5 of the breech block 4, that is the lower half of the guiding chute, ascends rearward so that the rearward path of motion of the breech block deviates upward from the centre-line of the barrel 8.
As taught by the invention, the centre of gravity 9 of the sliding plug 4 is located forward of the wrist pivoting point of the hand holding the handle 2, and thus the weapon, when the breech block is in its forward position and pressed against the rear end 10 of the barrel 3. In the embodiment depicted, the breech block projects partly, preferably with its main part, forward of the rear end 10 of the barrel 3, and the centre of gravity 9 of the breech block is located forward of the rear end of
REFERENCES:
patent: 3430534 (1969-03-01), Agren
patent: 3651736 (1972-03-01), Ingram
patent: 3990346 (1976-11-01), Irwin
patent: 4335643 (1982-06-01), Gal
Brown David H.
Griffiths John E.
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