Device for adjusting a choke bore

Abstract

Device for influencing the dispersion behavior of a shotgun, with an adjustable choke arranged in the area of ​​the muzzle, which provides a barrel constriction actuated by a screw sleeve, characterized in that the screw sleeve is self-locking and has at least one driver which engages in a cam slot of a sliding element which radially completely encloses the screw sleeve, is movable coaxially to the barrel and can be operated outside the muzzle area.

Description

[0001] The shot pattern of a shotgun can be influenced by selectively narrowing the bore diameter at the muzzle. This is achieved using chokes, also known as choke rings. Chokes differ in the degree of bore constriction and the resulting shot pattern. Cylinder chokes have no bore constriction, while full chokes have the greatest bore constriction and increase the effective range of the shotgun. Several intermediate sizes exist. Chokes can be permanently installed in the shotgun or screwed in as replaceable inserts. Replacement requires a tool and must be performed with the shotgun unloaded, and can be quite time-consuming.

[0002] To reduce adjustment time and improve flexibility, adjustable chokes, also known as poly-chokes, are disclosed in the prior art. These are generally designed as slotted barrel extensions. An axially movable screw sleeve at the muzzle allows for variable compression of the slots and thus adjustment of the barrel constriction. Examples of this are patents US1892522A, US2968111A, US3161979A, and US6557290B2; further examples can be found under IPC F41A21 / 42. In both hunting and sporting applications, flexible choke adjustment while the shotgun remains shouldered can be advantageous. However, since adjusting the barrel constriction with adjustable chokes requires repositioning the hand, this cannot be done while shouldering the gun. This is further compounded by the fact that the adjustment involves manipulating the muzzle, which, for safety reasons, should only be performed on an unloaded shotgun.

[0003] Prior art discloses inventions describing slotted chokes that can be narrowed by axially displaceable, conically tapered sleeves (US2442899A; US3812610A). Disadvantages of these designs include the force required and the lack of precision when moving the sleeves, as well as the undisclosed locking mechanism. Patent US4151671A further discloses an invention in which an axially displaceable linkage moves a screw sleeve, thereby narrowing a slotted choke. Locking is achieved by spring-loaded balls in detent positions.

[0004] Furthermore, adjustable chokes are disclosed in the prior art, in which the adjustment of the barrel constriction occurs automatically after the first shot is fired. Patents US6789343B1 and US3797155A are examples. This automation does not allow for freely selectable, situation-dependent adjustment by the shooter and limits flexibility.

[0005] The invention is therefore based on the technical problem of providing an adjustment device that allows choke adjustment without the need for manual operation at the muzzle, by relocating the operation to a point spaced away from the muzzle area.

[0006] This problem is solved by the features listed in claim 1.

[0007] The invention relates to a barrel assembly with an adjustable choke and operating elements for use outside the muzzle area. Further details of the invention will be explained below with reference to the following. Fig. The embodiments of the invention shown in Figures 1 to 3 will be explained in more detail. They show: Fig. 1. One variant of the device, with choke in cylinder configuration, Fig. 2. A variant of the device, with choke in cylinder configuration, in sectional view. Fig. 3 A variant of the device, with choke in full-choke configuration, in sectional view.

[0008] The figures show the barrel (1), the tubular magazine (2), and the barrel-magazine clamps (3) of a shotgun. A variant of the device is installed on it. An adjustable choke (4) with choke fingers (5) and a screw sleeve (6) is attached to the muzzle, as disclosed in the prior art. The screw sleeve (6) and the front end of the shotgun barrel (1) are encased by an axially movable sliding element (7). In the illustrated embodiment, the screw sleeve (6) has drive pins (8) which engage in cam slots (9) of the sliding element (7). The sliding element (7) is connected to an axially movable control element (10).

[0009] Fig. 1 and Fig. Figure 2 shows the embodiment of the device in which the choke fingers (5) are relaxed and run parallel. There is no barrel constriction, and the choke (4) is in a cylindrical configuration. An axial displacement of the push element (7) initiated at the operating element (10) is converted into a rotation of the screw sleeve (6) via the cam slots (9) and drive pins (8). The screw sleeve (6) moves axially through the sleeve thread (11) and presses the choke fingers (5) into the bore. The adjustable choke (4) thus causes a barrel constriction, cf. Fig. 3. The socket thread (11) is self-locking in the illustrated version and continuously fixes the set choke configuration. Reference sign 1 shotgun barrel 2 tube magazines 3 barrel magazine clamps 4 Adjustable Choke 5 choke fingers 6 screw sleeves 7 Shear element 8 drive pin 9 backstage slots 10 Control element 11 socket threads QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] US 1892522A

[0002] US 2968111A

[0002] US 3161979A

[0002] US 6557290B2

[0002] US 2442899A

[0003] US 3812610A

[0003] US 4151671A

[0003] US 6789343B1

[0004] US 3797155A

[0004]

Claims

Device for influencing the dispersion behavior of a shotgun, with an adjustable choke arranged in the area of ​​the muzzle, which provides a barrel constriction actuated by a screw sleeve, characterized in that the screw sleeve is self-locking and has at least one driver which engages in a cam slot of a sliding element which radially completely encloses the screw sleeve, is movable coaxially to the barrel and can be operated outside the muzzle area. Device according to claim 1, wherein the choke has several elastically deformable choke fingers which are pressed radially inwards by axial adjustment of the screw sleeve. Device according to one of the preceding claims, characterized in that the push element is attached to a control element which increases the distance to the muzzle. Device according to one of the preceding claims, characterized in that several drive pins engage in several cam slots. Device according to one of the preceding claims, characterized in that the push element surrounds the running element. Device according to one of the preceding claims, characterized in that the sliding element encloses the fore-end and / or the tubular magazine.

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