This application claims priority under 35 U.S.C. §119 to German Patent Application No. 20 2008 007 768.0 filed Jun. 11, 2008, the entire contents of which are incorporated herein by reference.
The present invention relates to a breech for a repeating rifle. The invention also relates to a barrel for such a breech.
From DE 43 05 700 C1, a breech of a repeating rifle according to the class is known. In that document, a locking chamber and a locking sleeve arranged concentric about this locking chamber are arranged within a locking guide that is displaceable on a system casing. The locking sleeve constructed as an expansion sleeve is divided on its front end by longitudinal slots into several flexible spring tongues. The spring tongues have, on their front ends, locking elements for engaging in an annular groove on the inside of the barrel. By means of an expansion cone provided on the locking chamber, the locking elements constructed integrally with the spring tongues of the locking sleeve can move between a radially inner unlocked position and a radially outer locked position. For this known breech, the expansion of the locking sleeve constructed as an expansion sleeve is achieved by its axial displacement against the expansion cone formed on the locking chamber.
The task of the invention is to create an alternative breech for a repeating rifle and an associated barrel that enable particularly stable and safe locking.
This task is achieved by a breech with the features as set forth in the claims and by an associated barrel as also set forth in the claims. Preferred improvements and advantageous embodiments of the invention are set forth below.
For the breech according to the invention, the expansion device for moving the locking elements between the inner unlocked position and the outer locked position is constructed as a support sleeve that can be displaced in the axial direction between the rear part of the locking chamber and the locking sleeve. By means of this support sleeve, a particularly stable and safe support of the locking sleeve is achieved primarily in the region of the locking elements. The locking elements are supported over a large surface area in their locked position by the support sleeve, by means of which a high degree of safety against undesired opening of the breech is achieved even for impermissibly elevated gas pressures. By means of the support sleeve, the locking elements on the locking sleeve can moreover be safely moved into the locked position also with relatively steep contact surfaces. By means of the steep contact surfaces, the radial forces acting on the barrel can be reduced and therefore the stability can be improved.
In a preferred construction, the locking sleeve is constructed as an expansion sleeve with several spring tongues that have, on the front end, the locking elements and, on their inside, run-on beveling for engaging with a front end of the support sleeve. Through the axial movement of the support sleeve relative to the locking sleeve, the locking elements provided on the spring tongues can be moved in a relatively easy and safe way between the radially inner unlocked position and the radially outer locked position.
In a construction that is particularly advantageous for the expansion of the locking sleeve and the force transmission, the locking chamber has, at the transition between the narrower, rear part and an enlarged breech head, a rear abutment surface inclined at an angle β of 80° to 85°, advantageously 83°, to the center axis of the locking chamber for correspondingly inclined front contact surfaces on the locking elements. The locking elements further contain relatively steep rear contact surfaces that are inclined in the locking position at an angle of 70° to 80°, advantageously 75°, to the center axis of the locking chamber and are led, in the locking position, into contact on a correspondingly steep, rear locking surface in a locking groove of the barrel. Through the steep construction of the contact surfaces, the spring tongues of the locking sleeve are loaded by the forces acting during the discharge of a shot due to the gas pressure less in the radial direction, but instead mainly in the axial direction, by means of which an optimized force transmission between the locking elements and the barrel is achieved.
The barrel belonging to the breech described above has, according to the invention, a relatively steep, rear locking surface for contact with the rear contact surfaces of several locking elements arranged on a locking sleeve. The rear locking surface is inclined at an angle α of 70° to 80°, advantageously 75°, relative to a center axis of the barrel. The pressure forces F acting on the barrel during the discharge of a shot through the locking elements thus have a relative large component Fx in the axial direction and only a relatively small component Fy in the radial direction, so that expansion of the barrel end caused, e.g., by increased gas pressure is prevented and thus the stability and safety of the locking can be improved.
Other special features and advantages of the invention emerge from the following description of a preferred embodiment with reference to the drawing. Shown are:
a, 6b: the breech of
a, 7b: the breech of
a, 8b: the breech of
a, 9b: the breech of
a, 10b: the breech of
a, 11b: the breech of
a, 12b: the breech during the opening process with a still locked locking sleeve.
In
The breech 2 contains a breech guide 7 that is constructed as a slide and that is guided so that it can move on a system casing 8 shown partially in
The locking sleeve 10 is fixed in the axial direction by a safety piece constructed as a chamber holder 14 within the breech guide 7. Within the locking sleeve 10, a support sleeve 15 that is coaxial to this locking sleeve is guided so that it can move in the axial direction by a predetermined amount. For this purpose, the support sleeve 15 has, in the region of the chamber holder 14, a recess 16. Through the dimensions of the recess 16, the displacement of the locking sleeve 10 is limited. Within the support sleeve 15, the rear, narrower part 17 of an essentially cylindrical locking chamber 18 is arranged coaxial to the support sleeve 15. The rear part 17 of the locking chamber 18 is thus surrounded coaxially by the locking sleeve 10, wherein, between the rear part 17 of the locking chamber 18 and the locking sleeve 10, the axial displaceable support sleeve 15 is arranged.
The locking chamber 18 further has, in addition to the narrower rear part 17, a breech head 19 that is enlarged and projects frontwards relative to the locking sleeve 10 and the breech guide 7 for engaging in the receptacle borehole 6 of the locking head 4 at the end of the barrel 1. In the narrower, rear part 17 of the locking chamber 18, there is a side opening 20 for engaging the chamber holder 14. The side opening 20 in the locking chamber 18 is somewhat larger than the chamber holder 14, so that the locking chamber 18 can move in the axial direction by a small amount relative to the breech guide 7. In a known way, in the locking chamber 18, the firing pin and an associated firing-pin spring are housed. The firing pin and the firing-pin spring are not shown, because their arrangement within the locking chamber 18 is known.
From the enlarged partial view of the front region of the locking chamber 18 according to
In the breech guide 7, a breech lever 27 shown in perspective in
Below, the function of the breech will be explained with reference to
In the open position of the breech 2 shown in
When the breech guide 7 is pushed farther forward relative to the control plate 47 arranged fixed on the system casing 8 past the position shown in
For the forward pivoting of the chamber stem 29 and the resulting rotation of the breech lever 27, the locking shoulders 31a and 31b press onto a front, beveled surface 49a or 49b of the cam elements 41a and 41b, by means of which the front catch tabs 43a and 43b according to
Through the further rotation of the breech lever 27 according to
If the breech lever 27 is rotated farther, due to the forward pivoting of the chamber stem 29 into the locking position shown in
For opening the breech 2, the chamber stem 29 is retracted and thus the breech lever 27 is rotated for raising the rear locking shoulders 31a and 31b. As emerges from
For the further retraction of the chamber stem 29, rear locking shoulders 31a and 31b of the breech lever 27 according to
When the chamber stem 29 is retracted, the upward projecting tab 36 of the breech lever is also rotated forward and presses on the head 38 of the releasing pin 40 that is shown in
Although specific embodiments of the invention have been disclosed, those having ordinary skill in the art will understand that changes can be made to the specific embodiments without departing from the spirit and scope of the invention. The scope of the invention is not to be restricted, therefore, to the specific embodiments, and it is intended that the appended claims cover any and all such applications, modifications, and embodiments within the scope of the present invention.
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20 2008 007 768 U | Jun 2008 | DE | national |
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