Abstract
A breech for a straight-pull repeater rifle, comprising a breech box and a locking sleeve guided therein as well as a locking bar guided in the breech box and connected to the locking sleeve, the locking bar connects a bolt head to a bolt handle with a interposition of a chain link, wherein the chain link is linked in an articulated manner to the locking bar and the bolt handle, and the bolt handle can be swivelled between an open position and a closed position of the breech and interacts with a firing pin nut connected to a firing pin. A bolt head inserted into a breech sleeve at an end of the breech facing away from the bolt handle is provided. The locking sleeve and the locking bar are a one-part locking sleeve-bar and a locking spring pushing the chain link in the direction of its closed position is provided.
Claims
1. A breech for a straight-pull repeater rifle, which comprises a breech box and a locking sleeve guided therein as well as a locking bar guided in the breech box and connected in one piece to the locking sleeve, the locking bar connects a bolt head facing a cartridge chamber to a bolt handle with the interposition of a chain link, wherein the chain link is linked in an articulated manner to the locking bar and the bolt handle, and the bolt handle is swivelled between an open position and a closed position of the breech and interacts with a firing pin nut connected to a firing pin, and a bolt head is inserted into a breech sleeve at an end of the breech facing away from the bolt handle, wherein the locking sleeve and the locking bar are made as a one-part locking sleeve-bar and a locking spring surrounding the locking sleeve-bar pushes the chain link in the direction of its closed position.
2. The breech according to claim 1, wherein a stop element for the locking spring comprising at least one pressure release slot is provided on the locking sleeve-bar.
3. The breech according to claim 2, wherein the stop element comprises a plurality of three pressure release slots, which are flat areas on the stop element and spaced uniformly apart from one another.
4. The breech according to claim 1, wherein the chain link is connected in an articulated manner to both the bolt handle and the locking sleeve-bar by means of a hinged connection.
5. The breech according to claim 1 wherein in closed position of the breech a longitudinal axis of the locking sleeve-bar encloses an angle of ≤0° with an axis running through centre points of an articulated connection between bolt handle and the locking sleeve-bar.
6. The breech according to claim 1, wherein the locking sleeve-bar with the bolt head and at least two clamping jaws are locked with a locking spring surrounding the locking sleeve-bar in the breech box.
7. The breech according to claim 1, wherein the locking sleeve-bar encloses an angle with a longitudinal axis of the breech of ≤4°.
8. The breech according to claim 1, wherein different bolt heads with different calibres from one another can be arranged in the breech sleeve in cooperation with the locking sleeve-bar.
9. The breech according to claim 1, wherein the breech box is provided with a spring-loaded push-in lock at its end incorporating the bolt head.
10. The use of a breech for a straight-pull repeater rifle according to claim 1, in a straight-pull repeater rifle which can be used with ammunition calibres and barrel inner diameters different from one another.
Description
DESCRIPTION OF THE DRAWINGS
[0019] The invention is explained in greater detail below with the aid of examples of embodiment represented in the drawing. The latter show:
[0020] FIG. 1 a view of the breech according to the invention in partial cross-section,
[0021] FIG. 2 a partial view of a breech from FIG. 1 in a closed position,
[0022] FIG. 3 a partial view of the breech similar to FIG. 2 in an open position of the breech,
[0023] FIG. 4 a cross-section through the end region of the locking sleeve-bar with the bolt head in a locked position, and
[0024] FIG. 5 a similar view of the end region of the locking sleeve-bar in an unlocked position,
[0025] FIG. 6 a partial view of a front end region of the breech with placed-on bolt head and locked push-in lock
[0026] FIG. 7 a detailed view which shows breech sleeve and bolt head.
DETAILED DESCRPTION OF THE INVENTION
[0027] FIG. 1 shows a partial view of the breech according to the invention, in which in particular elements such as the bolt head, a trigger and suchlike, which in the first place are not essential for a simplified representation of the embodiment according to the invention, are not represented.
[0028] In FIG. 1, a breech sleeve is denoted by 8, in the interior of which a locking sleeve-bar 9 is guided, the end of which facing away from a barrel is connected to a bolt handle 4 with the interposition of a chain link 5. Bolt handle 4 is mounted pivotably between an open and closed position, wherein the uncocked breech is shown in FIG. 1. Bolt handle 4 also cooperates with a firing pin 6 and a firing pin nut 7. Bolt handle 4 can be swivelled about a swivel point 19 and can be transferred from the shown position into a cocked position. During cocking and thus movement of bolt handle 4 in the direction of arrow 17, the movement of a roller 20 along an inclined face of firing pin nut 7 as well as a tensile stress of chain link 5 and a deflection of the same out of the position essentially aligned with locking sleeve-bar 9 through swivelling via a second swivel point 21 between chain link 5 and bolt handle 4 continue to follow. Both firing pin 6 and also chain link 5 are coupled with locking sleeve-bar 9, which locking sleeve-bar 9 is constituted in one piece, i.e. unlike embodiments according to the prior art, in which the locking sleeve-bars are in two parts, i.e. as a separate locking bar and locking sleeve, locking sleeve-bar 9 is constituted as a single part, wherein a holding element 22 is arranged on the part of locking sleeve-bar 9 which is facing the bolt handle 4. A locking spring 10 surrounds locking sleeve-bar 9 and is subjected to pressure in the position represented in FIG. 1, in that locking spring 10 is supported and becomes compressed on holding element 22 surrounding the locking sleeve-bar at least in the region of the end of locking spring 10. At the end of locking spring 10 facing away from holding element 22, it abuts against a stop element 12 located on locking sleeve-bar 9. Stop element 12 is constructed such that it comprises a plurality of flat areas, which act as pressure release slots 11. Pressure release slots 11 prevent a pressure built up in the interior of breech 1 from leading to a malfunction of breech 1 and prevent the build-up of an excessively high pressure in the interior of breech 1.
[0029] Furthermore, striking pin spring 28 is guided and held in the interior of holding element 22 constituted elongated and surrounding the locking sleeve-bar.
[0030] FIG. 2 represents the uncocked state of breech 1 and it can clearly be seen from this FIG. 2 that chain link 5 is arranged in such a way that its longitudinal axis does not lie 100% over the longitudinal axis of locking sleeve-bar 9, but encloses with the latter an angle α of approximately 0.01°. As a result of this small angle, chain link 5 in the closed position of bolt handle 4 is swivelled such that it is swivelled over the dead-centre position, which would be achieved with a 100% alignment of the two axes, so that departure of chain link 5 from its locking position can only take place by the application of a force in the direction of arrow 23 and in particular if this force acts on the swivel point between bolt handle 4 and chain link 5.
[0031] In FIG. 3, which represents the cocked position of bolt handle 4 and thus of breech 1, it can on the one hand be seen that, by the swivelling of bolt handle 4 in the opened position, chain link 5 is pulled over the second swivel point 21 out of its dead-centre position and at the same time roller 20 of bolt handle 4 slides over the inclined face of firing pin nut 7. With this swivelling movement of bolt handle 4, the firing pin interacting with firing pin nut 7, not visible in the figure, is subjected to pressure and at the same time locking spring 10 of locking sleeve-bar 9, not shown in FIG. 3, is subjected to traction. If an unintended triggering of firing pin 6 occurs during a movement of bolt handle 4 and thus of breech 1 before the movement into the position of FIG. 2 is complete, the energy released by firing pin 6 is directly transmitted through firing pin nut 7 onto roller 20 and through the special structural embodiment of bolt handle 4, firing pin nut 7 will enter into the recess of bolt handle 4 provided for the purpose and automatically close the breech. As a result of this automatic closing of the breech, unintendedly released firing energy is completely removed and ignition of the firearm is prevented.
[0032] In FIGS. 4 and 5, which show the region of the breech that is directed towards the cartridge chamber, the reference numbers are retained as far as possible and FIG. 4 shows the locked state of locking sleeve-bar 9 in breech box 2 and FIG. 5 the unlocked state of locking sleeve-bar 9 in breech box 2. In the locked state of locking sleeve-bar 9, locking sleeve-bar 9 is held by at least two clamping jaws 14, in particular spring-loaded clamping jaws, which are arranged in breech box 2 in such a way that they are splayed radially by 4°, as a result of which locking sleeve-bar 9 is held in the interior of the breech box by splayed clamping jaws 14. By this arrangement of locking sleeve-bar 9 in breech box 2, a further safety feature is provided, with which an unintentional opening of the breech can be prevented. Clamping jaws 14 are correspondingly applied differently here. It can also be seen from FIG. 4 that, in the locked state of locking sleeve-bar 9, the latter is gripped by clamping jaws 14 and locking sleeve-bar 9 interacts with bolt head 3. In the unlocked state, locking sleeve-bar 9 is pulled back on account of the swivelling of bolt handle 4 described in FIGS. 1 to 3 and the traction effect thus exerted on locking sleeve-bar 9 via chain link 5, and neither of locking jaws 14 is engaged in this position with locking sleeve-bar 9 and the latter is thus not arranged in the splayed position in the interior of breech box 2, but rather its longitudinal axis coincides with the longitudinal axis of breech box 2. Locking sleeve-bar 9 is not engaged here with bolt head 3.
[0033] FIG. 6 represents a further safety feature of breech 1 according to the invention, according to which an introduction of breech 1 without bolt head 3 as well as an introduction of bolt head 3 into breech box 2 without correct connection to locking sleeve-bar 9 is prevented. This safety feature in this connection is a spring loaded push-in lock 18, which at all events prevents insertion of locking sleeve-bar 9 without bolt head 3 or insertion of bolt head 3 alone in breech box 2 and therefore a connection with the cartridge chamber (not represented). Only with correct positioning and correct connection of bolt head 3 with locking sleeve-bar 9 is insertion of these elements and locking of the same in breech box 2 possible with the aid of push-in lock 18, the locking spring of which is denoted by 24.
[0034] FIG. 7 shows a detail view, which shows correct positioning of a locking sleeve 9 with bolt head 3. For this purpose, locking sleeve-bar 9 on the one hand comprises a thorn-shaped extension, which fits exactly into a corresponding opening of bolt head 3. Furthermore, a guide pin 25 is provided on breech sleeve 8, which can engage in a corresponding recess 26 of bolt head 3, in order to ensure exact positioning of breech sleeve 8 in relation to bolt head 3. Further locking elements 27 are provided on bolt head 3 for locking of breech sleeve 8 with bolt head 3.
[0035] Furthermore, the breech of the straight-pull repeater can additionally comprise all the safety features which straight-pull repeaters comprise. Thus, for example, on account of the symmetrical embodiment of the entire breech, a bolt catch can be mounted both on the right and on the left and the breech can be suitably used without conversion for right-handers and left-handers.
