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DE-202026000937-U1 - Device for adjusting a choke bore

DE202026000937U1DE 202026000937 U1DE202026000937 U1DE 202026000937U1DE-202026000937-U1

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.

Assignees

  • FETT MICHEL

Dates

Publication Date
20260513
Application Date
20260303
Priority Date
20260303

Claims (6)

  1. 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.
  2. Device according to Claim 1 , in which the choke has several elastically deformable choke fingers that are pressed radially inwards by axial adjustment of the screw sleeve.
  3. Device according to one of the preceding claims, characterized in that the push element is attached to an operating element which increases the distance to the muzzle.
  4. Device according to one of the preceding claims, characterized in that several drive pins engage in several cam slots.
  5. Device according to one of the preceding claims, characterized in that the push element surrounds the running end.
  6. Device according to one of the preceding claims, characterized in that the sliding element encloses the fore-end and/or the tubular magazine.

Description

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. To reduce adjustment time and improve flexibility, adjustable chokes, also called 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 the patents US1892522A , US2968111A , US3161979A or US6557290B2 Further information can be found under IPC F41A21/42. In both hunting and sporting applications, a 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 is not feasible 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. The prior art discloses inventions which describe slotted chokes that can be narrowed by means of axially displaceable, conically tapered cuffs ( US2442899A ; US3812610A Disadvantages of these designs include the force required and the lack of precision when moving the cuffs, as well as the undisclosed form of the locking mechanism. Patent US4151671A The invention further discloses an invention which, via an axially displaceable linkage, sets a screw sleeve in motion and thereby narrows a slotted choke. Locking is achieved by spring-loaded balls in detent positions. Furthermore, the prior art discloses adjustable chokes in which the adjustment of the barrel constriction occurs automatically after the first shot is fired. The patents are examples. US6789343B1 and US3797155A This automation does not allow for freely selectable, situation-dependent adjustments by the shooter and limits flexibility. 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. This problem is solved by the features listed in claim 1. 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. 1 to 3 The illustrated embodiments of the invention will be explained in more detail. They show: 1 one variant of the device, with choke in cylinder configuration, 2 A variant of the device, with choke in cylinder configuration, in sectional view, 3 A variant of the device, with choke in full-choke configuration, in sectional view. 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). 1 and 2 Figure 1 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 control 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. 3 The threaded sleeve (11) is self-locking in the illustrated version and continuously fixes the set choke configuration. Reference sign 1shotgun barrel2tube magazine3Barrel magazine clamps4Adjustable choke5Choke finger6screw sleeve7Slide element8drive pin9Backstage slit10Control element11socket thread QUOTES INCLUDED IN THE DESCRIPTION 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 applica