DE9318826U1 - Insert barrel - Google Patents

Description

The present invention relates to an insert barrel for a firearm with a carrier barrel with a cartridge chamber present at one end of the insert barrel, an adjustment device present at the other end of the insert barrel on the muzzle side with adjustment elements for adjusting the position of the insert barrel relative to the carrier barrel in order to achieve precise shooting performance.

Such insert barrels are used to convert a large-caliber weapon such as a shotgun into a weapon that fires bullets. Such insert barrels should be simple and inexpensive to manufacture. In addition, it must be possible to reliably adjust the position of the insert barrel relative to the carrier barrel in order to reliably adjust the point of impact.

STATE OF THE ART

A firearm with an insert barrel is known from the German utility model G 80 29 844.8, which has an adjustment bushing the outer diameter of which is equal to the inner diameter of the carrier barrel and which has a first enlarged bore and a narrower second bore adjoining the first bore. The diameter of the second bore corresponds to the outer diameter of the insert barrel. Adjustment elements are arranged in the end area of the enlarged bore in order to be able to adjust the position of the insert barrel relative to the carrier barrel. Such an adjustment bushing is relatively heavy and requires a high degree of precision in order to

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to be able to be arranged on the carrier barrel.

A hunting weapon with an insert barrel is known from the German utility model G 80 12 499, which has a rotatable and lockable eccentric in the area of the muzzle by means of which the position of the insert barrel relative to the carrier barrel can be adjusted. To zero the rifle, the eccentric is rotated until the required point of impact is reached. However, adjusting such an eccentric device is relatively complex and time-consuming.

DE 34 03 050 C2 discloses a push-in barrel for large-caliber firearms with an adjustment bushing, whereby the outside diameter of the adjustment bushing corresponds to the inside diameter of the choke bore of the carrier barrel, the adjustment bushing is coaxially attached to the push-in barrel in the area of a narrow bore, the adjustment bushing dips into the choke bore at least in sections when the push-in barrel is inserted, this section of the adjustment bushing dipping into the choke bore is penetrated by another bore and the holding part arranged on the cartridge chamber side has a collar that is radially supported on the inner wall of the cartridge chamber. This adjustment bushing is relatively heavy and, due to its arrangement in the muzzle area after the push-in barrel has been inserted, causes different weight ratios within the entire weapon, which can lead to serious changes in the point of impact of the parent weapon. In addition, adjustment work on the adjustment bushing is usually required in order to adapt it to the carrier barrel.

In the case of known insert barrels (DE 34 03 050 C2 and G 80 29 844.8), the adjustment means always act directly on the insert barrel in the muzzle area, which always leads to an obstruction of longitudinal expansion when heat is generated as a result of warm shooting and thus the point of impact can change. In addition, it can occur due to

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Forces that the adjustment means transfer to the barrel can lead to deformation of the insert barrel, which has a negative effect on
which can affect the shooting accuracy.

DESCRIPTION OF THE INVENTION

The present invention is based on the technical problem or task of specifying an insert barrel which is improved compared to the prior art mentioned, which can be adjusted in a simple manner and in which the position adjustment once achieved is reliable and even with frequent use
can be permanently fixed, at the same time a particularly
simple and therefore economical production can be ensured and in which no adjustment means are directly

act force-locking on the inner barrel and thus, if the inner barrel develops heat, a linear expansion as a result of warm firing is guaranteed or practically not hindered.

The insert barrel according to the invention of the type mentioned at the outset is given by the features of claim 1. Advantageous designs and further developments are the subject of the subclaims.

The insert barrel according to the invention is characterized in that the adjustment device is designed as a bushing with a
single through hole, the diameter of which essentially corresponds to the outside diameter of the insert barrel in the muzzle area, the adjustment device is attached to the insert barrel in the muzzle area in such a way that it protrudes beyond the muzzle-side front side of the insert barrel, the adjustment elements in the protruding area are present in the wall of the adjustment device and can be operated from the interior of the adjustment device and the outward-facing end areas of the adjustment elements on the inner

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-A- inner wall area of the carrier barrel come into contact.

A significant advantage of the invention is that the entire insert barrel, in comparison to the known firearms with an inserted insert barrel, has a completely exposed bearing in the muzzle direction in the carrier barrel, which allows unlimited expansion of the insert barrel when heat is generated and thus reduces a possible shift in the point of impact when firing warm to a minimum.

Since the outer wall of the adjustment device does not come into direct contact with the inner wall of the carrier barrel, no complex fitting work is required to fit the adjustment device into the carrier barrel. Another advantage of the invention is that the muzzle area is lighter than that of known firearms with an inserted insert barrel and the rifle does not become top-heavy due to the relatively high weight of the adjustment device, so that only an insignificant shift in the point of impact of the mother weapon occurs. In addition, less material has to be used for the adjustment device itself, which has an advantageous effect in terms of costs. Another advantage is that the muzzle of the insert barrel is protected because it is set back from the front end plane of the adjustment device, with the adjustment device ending with the carrier barrel on the muzzle side.

In a preferred embodiment of the insert barrel according to the invention, the adjustment elements are arranged at an angle of approximately 90° to the axis of the insert barrel. As a result, the adjustment elements, which according to a particularly advantageous embodiment are designed as screws, preferably grub screws, can be operated or turned, for example, using an angled Allen key, in order to adjust the position of the insert barrel within the carrier barrel.

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The inward-facing head of the adjustment elements each has a hexagon socket contour.

In an alternative embodiment of the insert barrel according to the invention, the adjustment elements are inclined outwards towards the cartridge chamber side when viewed from the muzzle side. The angle to the axis of the insert barrel is between 110° and 140° when viewed from the muzzle side. The inclined arrangement makes it possible to use tools to operate the adjustment elements that have a long, straight shaft, such as a screwdriver, which can be brought into engagement with a corresponding slot on the inside of the head of the adjustment element, whereby the tool is not hindered in its rotation for adjustment.

It has proven to be advantageous to provide a total of four adjustment elements that are offset by 90° around the circumference, which allows precise adjustment of the insert barrel to be achieved in a simple manner.

The adjustment elements can be fixed in their position so that once the optimal position has been set, it can be reliably and permanently guaranteed even when the insert barrel is reinserted into the carrier barrel. Fixing screws, preferably grub screws, can be used as a fixing device. These are arranged in a threaded hole that runs essentially parallel to the axis of the insert barrel.

In a particularly preferred development of the insert barrel according to the invention, the outward-facing end areas of the adjustment elements, which come into contact with the inner wall of the carrier barrel during adjustment, are made of plastic, brass, aluminum or the like. By using such "soft" materials, damage to the

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Inner wall of the carrier barrel avoided.

Large deformation amplitudes often lead to an insufficient adjustment range. In order to avoid these large deformation amplitudes when adjusting the insert barrel within the carrier barrel, there is at least a first and a second bearing ring around the insert barrel between the adjustment device and the cartridge chamber, each of which rests on the inner wall of the carrier barrel.

Further embodiments and advantages of the invention result from the features further listed in the claims and from the exemplary embodiments given below. The features of the claims can be combined with one another in any way, provided they do not obviously exclude one another.

SHORT DESCRIPTION OF THE DRAWING

The invention and advantageous embodiments and further developments of the same are described and explained in more detail below using the examples shown in the drawing. The features shown in the description and the drawing can be used individually or in combination in accordance with the invention. The exemplary embodiments shown show individual structurally implemented designs of an insert barrel according to the invention. In addition, other structural implementations are possible, which are apparent to the person skilled in the art without any further inventive effort. They show:

Fig. 1 schematic side view of an insert barrel according to the invention inserted into a carrier barrel,

Fig. 2 schematic section through the muzzle area of the insert barrel according to Fig. 1 with a first, vertical

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perpendicular to the longitudinal axis of the insert barrel and

Fig. 3 schematic section through the muzzle area of the insert barrel according to Fig. 1 with a second design of the adjustment elements inclined to the longitudinal axis of the insert barrel.

WAYS TO CARRY OUT THE INVENTION

According to Fig. 1, an insert barrel 20 is inserted into the carrier barrel 10 in a schematically shown carrier barrel 10. The insert barrel 20 is inserted into the carrier barrel from the cartridge chamber side 12. On the cartridge chamber side 12 there is a cartridge chamber 13 known from the German utility model G 80 12 499. This has an extension 17 in the transition area 15 of the cartridge chamber, which rests in a transition area 15 of the inner wall of the carrier barrel 10 and absorbs forces acting in the direction of the longitudinal axis 24 of the insert barrel 20 or carrier barrel 10. The position of the extension 17 is adjusted and secured by a nut 23 screwed onto a thread 19.

On the muzzle side 14 of the insert barrel 20 there is an adjustment device 16, which is designed as a bushing with a single through hole 22. The diameter of the hole 22 corresponds to the outside diameter of the insert barrel 20. The bushing 16 is connected to the insert barrel 20 by means of adhesive. The bushing 16 protrudes with a certain projection Ü on the front side over the muzzle front side of the insert barrel 20. In the area of this projection Ü there are adjustment elements 18 in the wall according to the embodiment of Fig. 2, which are designed as grub screws, the axis 26 of which is arranged perpendicular to the axis 24. The adjustment elements 18 are adjustable from the interior of the projection area by means of an angled

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Hexagon tool can be actuated by bringing this hexagon tool into engagement with the hexagon recess present in the inner end area of the adjusting element 18. This allows the adjusting element 18 to be rotated and its position in the direction of the axis 2 6, i.e.

perpendicular to the axis 24. This process of turning the adjustment elements 18 is carried out during adjustment until the desired point of impact is reached during zeroing by adjusting the firearm.

The adjustment elements have a dome-like contour in their outward-facing end area 21, which is made of brass, for example. This dome-like contour comes into contact with the inner wall of the carrier barrel 10, whereby the position of the insert barrel is adjusted relative to the carrier barrel by appropriately turning the adjustment elements. As soon as an optimal setting is achieved, the respective position of the adjustment elements is fixed by tightening grub screws 33, whereby these grub screws are each arranged in a threaded hole that is parallel to the axis 24 in the wall of the socket 16. This securely fixes the adjustment elements 18 in their position and the position of the insert barrel can be reliably and permanently maintained even with frequent use. This ensures permanent shooting precision.

The embodiment shown in Fig. 3 differs from the embodiment according to Fig. 2 in that the adjustment elements 18 are inclined to the axis 24, namely at an angle of approx. 110° from the mouth side. Identical components have the same reference numerals and are not explained again. By arranging the axis of the adjustment elements 18 at an angle, it is possible to use a tool, such as a screwdriver, which can be brought into engagement with a corresponding slot on the adjustment element 18. This has the

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Advantage/ that the rotary movement of the tool for adjusting the adjustment elements is not limited by the geometry within the bushing as in the embodiment according to Fig. 2, which in the embodiment according to Fig. 2 requires the tool to be applied several times, but rather with a single application of the tool the adjustment element can be rotated until it has reached its intended position.

In the area between the muzzle side 14 and the cartridge chamber side 12, a first bearing ring 30 and a second bearing ring 32 are present on the outside of the insert barrel 20, on each of which an elastic O-ring 34 is arranged all the way around, which is supported on the inner wall of the carrier barrel 10. This reduces the bending deformation in the rear area of the insert barrel 20 during adjustment within the carrier barrel 10, so that the deformation amplitudes of the insert barrel 20 in the area between the adjustment device 16 and the first bearing ring 30, the first bearing ring 30 and the second bearing ring 32 and the cartridge chamber 13 can be kept low and an adjustment range to the desired extent is made possible in the front area.

In a variant not shown, the slot 40 that inevitably arises between the adjustment device 16 and the carrier barrel 10 is sealed by means of elastic sealing means so that no dirt can penetrate into the carrier barrel.

Claims (1)

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«······ ·· ·* 01) Insert barrel (20) for a firearm with a carrier barrel (10) with - a cartridge chamber (13) / - an adjustment device (16) provided on the other end region (14) of the insert barrel (20) on the muzzle side with adjustment elements (18) for adjusting the position of the insert barrel (20) relative to the carrier barrel (10) in order to achieve a precise adjustment of the point of impact, characterized in that - the adjusting device (16) is designed as a bushing with a single through hole (22), the diameter of which essentially corresponds to the outer diameter of the insert barrel (20) in the muzzle area, - the adjustment device (16) is attached to the insert barrel (20) in the muzzle area in such a way that it has a projection (Ü) over the muzzle-side front side of the insert barrel (20), - the adjustment elements (18) are present in the projection area (Ü) in the wall of the adjustment device (16) and can be operated from the interior of the adjustment device and - the outward-facing end regions (21) of the adjustment elements (18) act on the inner wall region of the carrier barrel (10) when the insert barrel (20) is inserted into the carrier barrel (10). 02) Insert barrel according to claim 1, characterized in that the adjusting elements (18) are arranged at an angle of approximately 90° to the axis (24) of the insert barrel (Fig. 2). SIMM-04gDE 07 December 1993 -2- 03) Insert barrel according to claim 1, characterized in that the adjusting elements (18) are inclined at an angle of > 90°, preferably 110 to 140° to the axis (24) of the insert barrel (20) when viewed from the muzzle side (Fig. 3). 04) Insert barrel according to one or more of the preceding claims,
characterized in that a total of four adjusting elements (18) are present, which are circumferentially offset by 90° in the protruding wall of the adjusting device (16). 05) Insert barrel according to one or more of the preceding claims, characterized in that the adjusting elements (18) can be fixed in their position. 06) Insert barrel according to one or more of the preceding claims, characterized in that the adjusting elements are designed as screw elements, preferably grub screws (18). 25 07) Insert barrel according to one or more of the preceding claims, characterized in that the adjusting device is soldered, glued or fitted onto the slide-in barrel. 35 08) Insert barrel according to one or more of the preceding claims, characterized in that the outwardly facing end regions (21) of the adjusting elements (18) coming into contact with the inner wall of the carrier barrel (10) are made of plastic, brass, aluminum SIMM-04gDE I I'..' "; .·,·..* \ 07 December 1993 ·. ·· * -3-
or the like. 09) Insert barrel according to one or more of the preceding claims, characterized in that a first bearing ring (30) is fastened around the insert barrel (20) at a distance from the adjusting device (16) and a second bearing ring (32) is fastened around the insert barrel (20) at a distance from the first bearing ring (30), the bearing rings being supported on the inner wall of the carrier barrel (10). 10) Insert barrel according to claim 9, characterized in that the distance of the first bearing ring to the mouth side is approximately 80 to 100 mm and the distance between the first and the second bearing ring is approximately 100 to 200 mm. 11) Firearm, characterized in that it has an insert barrel according to one or more of claims 1 to 10.