Ordnance – Breech closures – Transverse
Reexamination Certificate
1999-02-08
2001-02-13
Eldred, J. Woodrow (Department: 3644)
Ordnance
Breech closures
Transverse
C089S017000
Reexamination Certificate
active
06186041
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application claims the priority of German Application No. 198 04 653.7 filed Feb. 6, 1998, which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
This invention relates to a large-caliber weapon which has a barrel provided with a breech ring, a breechblock shiftably received therein, as well as a barrel recuperator.
In large-caliber weapons the recuperating motion effected by the barrel recuperator is often also used for opening the breechblock by means of an opener cam, for ejecting the empty propellant case, for arming the firing pin and for again closing the breechblock as soon as a new cartridge has been introduced into the barrel. The barrel recuperator and the breechblock are operatively coupled to one another for performing these functions.
It is a disadvantage of the above-outlined weapons that among others, due to the interconnection between the barrel recuperator, the breech ring and the breechblock by the opener cam, powerful shocks are generated which lead to vibrations and may adversely affect the dispersion pattern of the weapon.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an improved weapon of the above-outlined type in which an opening of the breechblock is possible during the recuperating motion of the barrel without generating shocks which would cause vibration and would adversely affect the dispersion pattern of the weapon.
This object and others to become apparent as the specification progresses, are accomplished by the invention, according to which, briefly stated, the weapon includes a barrel; a breech ring attached to a rearward end of the barrel; a groove provided in the breech ring; a movable breechblock mounted in the breech ring and having open and closed positions; a slide mounted in the breech ring and being guided by the breech ring groove for displacements relative to the breech ring; a connecting element for coupling the slide to the breechblock for causing motion of the breechblock between the open and closed positions by the displacements of the slide; and a control cam rotatably supported in the breech ring. The control cam has a cam track coupled to the slide for effecting displacements of the slide upon rotation of the control cam. Further, an external drive is provided for rotating the control cam.
The invention is based on the principle according to which the opening and closing of the breechblock is effected by an external drive rather than by the force derived from the recuperator. As a result, not only an opening of the breechblock may be effected without impact loads (shocks) of the weapon but also a very uniform opening and closing motion of the breechblock may be ensured. Further, by using an external drive the opening of the breechblock may be timed independently from the motion of the barrel recuperator and may be selected as a function of the cycling of the ammunition supply to the weapon which is a particularly significant advantage in remote-controlled weapons.
According to a preferred embodiment of the invention, the breechblock is connected by means of a traverse with two slides guided laterally in respective vertical grooves at opposite sides of the breech ring. The slides are, in turn, in engagement with respective control cams which are rotatably supported in the breech ring and which are coupled to a common external drive.
To obtain a particularly uniform motion of the breechblock during opening and closing, an eccentrically supported control cam has been found advantageous which engages the inner wall face of the frame-shaped slide.
REFERENCES:
patent: 4462299 (1984-07-01), Grunewald et al.
patent: 6006645 (1999-12-01), Breuer et al.
patent: 31 42 457 (1983-05-01), None
Eldred J. Woodrow
Kelemen Gabor J.
Rheinmetall W & M GmbH
Venable
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