DE8904801U1 - Insert barrel for large caliber firearms - Google Patents

Description

14.04.1989 Su/Wi
G1754

Bernhard FRITZ, 7165 Fichtenberg

Insert barrel for large caliber firearms

State of the art

The invention is based on an insert barrel for large-caliber firearms according to the type of the main claim. Such insert barrels are barrel-long and are mainly used for drillings or over-and-under shotguns, which have at least one shotgun barrel in addition to a rifle barrel. Since the shotgun barrel serves as a carrier barrel, an additional rifle barrel can be obtained by inserting an insert barrel, which increases the hunting-appropriate use of the weapon with relatively little effort.

In known insert barrels of the generic type (DE-OS 34 03 050), the bending adjustment is carried out by means of grub screws that serve as adjustment means and run radially in the adjustment bushing, the access point of which is

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installed insert barrel is covered by the carrier barrel. For this reason, the insert barrel must be removed from the weapon for adjustment and then reinstalled after adjustment. Although the installation position of the insert barrels in the carrier barrel is fixed, sometimes several removals and installations must be carried out until the correction of the point of impact is satisfactory. It is known that some insert models change the point of impact when removed and reinstalled without any adjustment having been made.

Advantages of the invention

The insert barrel according to the invention with the characterizing features of the main claim has the advantage that for adjustment, i.e. for adjusting the point of impact, the insert barrel no longer has to be removed from the shotgun barrel of the weapon, but can be adjusted from the front while installed. This makes zeroing much more efficient. In addition, errors that can occur when removing and installing the insert barrel during "zeroing" are avoided. Last but not least, the shooter can very easily correct the point of impact of the insert barrel himself and at the shooting range.

Various devices can be used as adjustment means, such as screws, which are

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accessible from the front side in threaded holes arranged at an angle to the longitudinal axis of the insert barrel or through other devices accessible from the front side.

According to an advantageous embodiment of the invention, threaded screws (grub screws) accessible from the front of the adjustment bushing serve as adjustment means, which engage radially guided, movable pressure parts via a conical tip in the manner of an inclined plane, so that when the threaded screws are turned, the pressure parts can be moved radially in relation to the end section of the insert barrel. In this preferred embodiment, the pressure parts can be designed as smooth pins that are guided in radial bores, with the radial bores being arranged at right angles to the axis of the threaded screws. In order to achieve a favorable adjustment effect, according to a corresponding embodiment of the invention, the pins have an inclined plane on the front facing the threaded screws. Advantageously, this design has little tendency to misalignment.

Further advantages and advantageous embodiments of the invention can be found in the following description, the drawings and the claims.

drawing

An embodiment of the subject matter of the invention

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is shown in the drawing and described in more detail below. 3s show:

Fig. 1 the muzzle area of the insert barrel and the built-in adjustment bushing in longitudinal section;

Fig. 2 the front view of the insert barrel with adjustment bushing according to arrow II in Fig. i and

Fig. 3 shows the adjustment principle.

Description of the embodiment

The insert barrel 1 shown in the drawing is %

shown here only in its end section and without ■-' the shotgun barrel that holds it as a carrier barrel, in

this insert barrel can be inserted muzzle-locked ;Jj

As can be seen from the following description, |

the muzzle of the insert barrel 1 can be seen from the front |

without having to remove the insert barrel ^ from the shotgun barrel.

Pins 4 are guided axially displaceably in radial bores 2 of an adjusting bushing 3 connected to the insert barrel 1 in a known manner. As is known, an annular space 5 open towards the muzzle is present between the adjusting bushing 3 and the insert barrel 1. The pins 4 have an inclined surface 6 on the side facing away from the insert barrel 1, which is engaged by a cone 7 of a grub screw 8, which is inserted from the front side - arrow direction II - via a corresponding

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The adjustment tool (screwdriver) can be used to rotate the device. In the example shown, there are four such pins 4 and correspondingly four grub screws 8. However, at least three pins 4 or grub screws 8 must be provided for satisfactory adjustment.

The further these grub screws 8 are screwed in, the more their cone 7 presses the pins 4 in the respective radial bore 2 in the direction of the insert barrel 1 and vice versa, the more the grub screws are unscrewed, the more the insert barrel can be bent in this direction. The axes of the pins 4 and those of the grub screws 8 each enclose an angle of 90°.

The adjustment is carried out as follows: If the insert barrel muzzle is to be adjusted to the right, the right grub screw δ is slightly unscrewed from the muzzle side II (see Fig. 2) so that the right pin 4 gives way. Now the left grub screw 8 is screwed in further, whereby the left pin 4 is pressed to the right and in the process moves the insert barrel 1 until it rests against the pin 4. The adjustment is carried out in the same way in the vertical direction.

All features presented in the description, the following claims and the drawings can be essential to the invention both individually and in any combination with one another.

Claims (7)

12.04.1989 Su/Wi
G1754 Ber nh ard FRITZ, 7165 Fichteiiberg Insert barrel for large caliber firearms Protection claims Insert barrel for large caliber firearms, - with an adjustment bushing arranged on the muzzle side for bending adjustment of the insert barrel, with a stepped bore, which is attached to the insert barrel with the narrower bore section and which forms a blind ring opening open towards the muzzle with the wider bore section and the end section of the insert barrel? - and with adjusting means that engage radially at the end section of the insert barrel and are guided in the adjusting bushing with force fit^ characterized in that the adjusting means (2, 4, 6, 7, 8) are arranged on the mouth-side face 12.04.1989 Su/Wi
G1754 (II) from the adjustment bushing (3) of the insert barrel fi (1) are adjustable. ä 2. Insert barrel according to claim 1, characterized in that threaded screws (8) (grub screws) accessible from the front side of the adjusting bushing (3) serve as adjustment means, which engage radially guided displaceable pressure parts (4) via a conical tip (7) in the manner of an inclined plane, so that when the threaded screws (8) are turned, the pressure parts (4) are radially displaceable in relation to the end section of the insert barrel (1). 3. Insert barrel according to claim 2, characterized in that the pressure parts are designed as smooth pins (4) and are guided in radial bores (2). 4. Insert barrel according to claim 3, characterized in that the radial bores (2) run at right angles to the axis of the threaded screws (8). 5. Insert barrel according to claim 3 or 4, characterized in that the pins (4) have an inclined plane on the end face facing the threaded screws (8). 6. Insert barrel according to one of claims 2-5, characterized in that at least three threaded screws (8) are present for adjustment. 12.04.1989 Su/Wi G 1754 7. Insert barrel according to one of the preceding claims, characterized in that the insert barrel (1) and the adjusting bush (35) are flush with the rifle barrel at the front.