Ordnance – Automatic – Breech block lock
Reexamination Certificate
1999-08-13
2001-08-21
Jordan, Charles T. (Department: 3641)
Ordnance
Automatic
Breech block lock
C089S187010, C089S186000
Reexamination Certificate
active
06276256
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a breechblock for barrel weapons, having a breechblock head which is guided in a breechblock guide and, by means of a control element which can be moved to and fro in a straight line and has control ramps, can be brought out of a loading position into a locking position, which is parallel to and axially displaced with respect to the loading position, inside a breechblock bearing, which breechblock head has supporting surfaces, which are associated in a form-locking manner with the control ramps of the control element, and at least one locking boss, which corresponds with a recess in the breechblock, for the purpose of locking in the locking position, as represented in U.S. Pat. No. 3,044,203 A, for example.
The breechblock head is there surrounded by a slide, which is held by way of guide lugs and a bolt carriage, the extensions of which are led in a straight line by way of slits in the side walls of the bolt housing. In order to be able axially to lift the breechblock head during the rectilinear movement which is initiated by way of a stem, there are provided in the breechblock head inclined grooves, with which corresponding projections of the stem cooperate. Furthermore, the breechblock head has a locking boss with an inclined surface, which locking boss can engage in a recess in the bolt housing when the breechblock head takes up the locking position.
Such a bolt is constructed so as to be relatively long and in addition to a breechblock head of complicated construction requires a slide which is likewise of complicated construction and a bolt carriage, all of which are to be guided in the bolt housing.
A further disadvantage of this breechblock is to be seen in that because of the locking surface which is only on the upper side, it makes it difficult to transfer the overturning moment, which occurs during the development of the shot, via the slide to the bolt carriage, something which requires the components to have a fit with close tolerances.
According to a subsequently published proposal, the breechblock head of such a breechblock with recesses in the breechblock bearing has corresponding locking bosses and is provided with control pins which cooperate with control ramps of a control plate which can be moved in a straight line, in order to be able to bring the breechblock head out of the loading position into the locking position; see DE 197 34 042 A1.
Many other breechblocks which render possible the loading and sealing closure of the rear barrel end after the barrel weapon has been loaded are also known. The most usual are, in the case of hand firearms, so-called rotating boss breechblocks, in which by means of a manual downwards movement, at right angles to the weapon axis, of a bolt handle, a locking boss is rotated into a recess of the barrel or the breech casing for locking; see U.S. Pat. No. 2,649,800 A.
SUMMARY OF THE INVENTION
The underlying object of the invention is now to provide a breechblock for barrel weapons, in particular those having a so-called straight-pull breechblock, the construction of which for the movement out of the loading position into the locking position and vice versa is designed more simply than before.
Starting from the breechblock mentioned in the introduction, this object is achieved in accordance with the invention as a result of the fact that the control ramps are parts of arcuate control slits of guide rails, which are arranged on both sides of the breechblock head and with which there are associated as supporting surfaces control pegs connected to the breechblock head, and that provided on the breechblock head are locking bosses corresponding to recesses in the breechblock bearing, all of these in such an arrangement that when the guide rails are moved, the breechblock head can, by way of its control pegs, in the extent of the guide embodied by the control ramps of the control slits, be brought in a form-locking manner out of the loading position into the locking position, which is at a distance and axially displaced, and be locked there.
The development in accordance with the invention of the breechblock achieves a central take-up of the gas pressure which occurs when the shot is fired, because there is provided on the breechblock head a plurality of locking bosses, which are locally and axially displaced with respect to each other and which are engaged with the corresponding recesses in the breechblock bearing and therefore prevent any tilting of the breechblock head. In this way, an optimal shot precision is rendered possible with technically simple means.
According to a further feature of the invention, all of the locking bosses and the recesses which cooperate therewith have surfaces which each have run-down slopes at the same angle, by which, in the case of the backward movement of the breechblock head over the control ramps, there is generated a power ratio which renders possible with the most minimal expenditure of force an opening of the breechblock after the shot has been fired.
Further features of the invention emerge from the subclaims.
REFERENCES:
patent: 2267501 (1941-12-01), Holek
patent: 2649800 (1953-08-01), Peters
patent: 3044203 (1962-07-01), Wilhelm et al.
patent: 3191331 (1965-06-01), Hurley
patent: 3969983 (1976-07-01), Zellweger et al.
patent: 4161836 (1979-07-01), Hayashi
patent: 4213621 (1980-07-01), Claypool
patent: 4461203 (1984-07-01), Jawdat
patent: 4655118 (1987-04-01), Bruderer et al.
patent: 4909129 (1990-03-01), Reynolds
patent: 5913262 (1999-06-01), Keppeler
patent: 6101919 (2000-08-01), Murello
patent: 197 34 042 A1 (1997-08-01), None
patent: 880 598 (1943-04-01), None
Chambers Troy L.
Darby & Darby
Jordan Charles T.
Sommer + Ockenfus GmbH
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