HANDHELD FIREARM WITH AN ADJUSTABLE SHOULDER BRACE

Abstract

 A handheld firearm with an adjustable shoulder brace (7) that is seated in a firearm chassis (10) using a pair of rods (5), slidingly mounted in a guide (17). The current position of the shoulder brace (7) is lockable by a locking mechanism that comprises a transversal locking element (1), seated vertically adjustably under the pair of arms (5). Both the opposite ends of the locking element (1) are guided in opposite corresponding vertical grooves (9) formed in the firearm chassis (10). The locking element (1) is biased by a spring (4) towards the rods (5) where at the bottom side of each of the rods (5), at least two spaced apart pairs of corresponding recesses (2) are produced for snapping of the locking element (1). The locking element (1) can be manually pushed out of the recesses (2) by means of a control button (12). The locking element (1) is attached to a carrier (3) wherein the carrier (3) is seated in the firearm chassis (10) in a swinging way about an axis (6) that is arranged in a hole (8) in the firearm chassis (10) between the rods (5).

Description

Technical field

[0001] The invention relates to a handheld firearm with an adjustable shoulder brace that is seated in the firearm chassis using a pair of rods, slidingly mounted in a guide, wherein the current position of the shoulder brace is lockable by a locking mechanism that comprises a transversal locking element, seated vertically adjustably under the pair of arms wherein both the opposite ends of the locking element are guided in opposite corresponding vertical grooves formed in the firearm chassis and the locking element is biased by a spring towards the rods where at the bottom side of each of the rods, at least two spaced apart pairs of corresponding recesses are produced for snapping of the locking element and the locking element can be manually pushed out of the recesses by means of a control button.

Prior Art

[0002] Some handheld firearms are provided with a shoulder brace - butt - the length of which can be adjusted. The reason for it is mainly a reduction of the firearm dimensions, which facilitates its carrying, storage or its entire usage. The adjustment of different distances of the brace from the trigger also makes it possible to take into account different sizes of the figure or arm length of the particular user.

[0003] There are a number of known manners of solving the adjustment of the shoulder brace length.

[0004] A number of known solutions use a tube that is attached to the firearm in a tilting way. A smaller pipe is slid into the tube, the entire shoulder brace being fixed to the pipe.

[0005] A tilting shoulder brace is known e.g. from the document US10704848.

[0006] Other solutions use smaller lateral rails that are, in case of a change of the length of the shoulder brace, slid at the sides towards the front in the shooting direction.

[0007] An extensible shoulder brace is known e.g. from the documents DE3130562A1, CN111457786, US2020200505A, ES2751696 or US10527385.

[0008] Every such telescopic shoulder brace enables adjustment of at least two positions - completely retracted, completely extended. It may further comprise various intermediate positions allowing the user to adjust the extension length as necessary in every particular case.

[0009] To prevent spontaneous retraction of the shoulder brace during shooting from the firearm, the firearm is fitted with a mechanism that is able to lock the butt in defined positions. In one of the known embodiments of the locking mechanism, a transversal locking pin is used that is mounted vertically adjustably under the pair of arms of the shoulder brace. Both the opposite ends of the locking pin are guided in opposite corresponding vertical grooves formed in the firearm chassis. The locking pin is biased by a spring towards the rods of the shoulder brace wherein at the bottom side of each of the rods at least two spaced apart pairs of corresponding recesses are arranged for snapping of the locking pin. The locking pin is then directly controlled by the shooter with the use of a button.

[0010] Depending on the used gauge, and thus the recoil of the firearm, these mechanisms are exposed to relatively high stresses, because the entire recoil must only be absorbed by the transversal locking pin guided in opposite grooves in the firearm chassis. Therefore, all the parts are made of metallic materials. This may be a clear drawback in the competitive environment.

[0011] The object of the invention is to propose such a shoulder brace structure that would not exhibit the above-mentioned drawbacks of the prior art.

Disclosure of invention

[0012] The said object is achieved with a handheld firearm with an adjustable shoulder brace that is seated in the firearm chassis using a pair of rods, slidingly mounted in a guide. The current position of the shoulder brace is lockable by a locking mechanism that comprises a transversal locking element, seated vertically adjustably under the pair of arms. Both the opposite ends of the locking element are guided in opposite corresponding vertical grooves formed in the firearm chassis. The locking element is biased by a spring towards the rods. At the bottom side of each of the rods, at least two spaced apart pairs of corresponding recesses are produced for snapping of the locking element and the locking element can be manually pushed out of the recesses by means of a control button. The principle of the invention is that the locking element is attached to a carrier wherein the carrier is seated in the firearm chassis in a swinging way about an axis that is arranged in a hole in the firearm chassis between the rods.

[0013] An advantage of the solution according to the invention is that the inserted carrier makes it possible to distribute the shooting recoil into two nodes, namely via the opposite ends of the locking element to the opposite corresponding vertical grooves formed in the firearm chassis on the one hand, and to the seat of the carrier in the firearm chassis on the other hand. This facilitates the use of a plastic firearm chassis.

[0014] In a preferred embodiment, the control button is vertically slidingly seated in the holder of the trigger mechanism and in the breech housing wherein a transversal pin that bears on the carrier from above passes through the control button.

Brief description of drawings

[0015] The invention will be described in more detail with reference to an example of a particular embodiment of a handheld firearm with an adjustable shoulder brace according to the invention, illustrated in the attached drawings wherein individual figures show:

Fig. 1 - a detail of the rods of the shoulder brace and the locking mechanism in the "locked" position, without the firearm chassis for clarity

Fig. 2 - a detail of the rods of the shoulder brace and the locking mechanism in the "unlocked" position, without the firearm chassis for clarity

Fig. 3 - a greater detail of the shoulder brace and the locking mechanism in the "locked" position, without the firearm chassis for clarity

Fig. 4 - a greater detail of the shoulder brace and the locking mechanism in the "unlocked" position, without the firearm chassis for clarity

Fig. 5 -a top view of a detail of the locking mechanism between the rods of the shoulder brace, without the firearm chassis for clarity

Fig 6 - the rear end of the firearm with a partly extended shoulder brace

Fig. 7 - Y-Y cross-section of the firearm in the place of the locking element

Fig. 8 - Z-Z cross-section of the firearm in the place of the carrier axis

Fig. 9 - a side view of the firearm handle with the indication of the Y-Y and Z-Z sections

Fig. 10 - the locking mechanism with the control button in the "locked" position

Fig. 11 - the locking mechanism with the control button in the "unlocked" position

Description of preferred embodiments

[0016] Individual structural assemblies of an embodiment example of a handheld firearm with an adjustable shoulder brace 7 and a locking mechanism according to the invention are shown in Figs. 1 to 11.

[0017] The shoulder brace 7 has two rods 5 arranged next to each other that are seated in the firearm chassis 10 in a sliding way in a guide 17 (see e.g. Figs. 7, 8 and 9).

[0018] The current position of the shoulder brace 7 is lockable by a locking mechanism that, in the embodiment shown, comprises a transversal locking element 1, seated vertically adjustably under the pair of rods 5 in such a way that both the opposite ends of the locking element (1) are guided in the opposite vertical grooves 9 formed in the firearm chassis 10. The locking element 1 is attached to a carrier 3 and the carrier 3 is mounted in the firearm chassis 10 in a swinging way about the axis 6, which is arranged in a hole 8 in the firearm chassis 10 between the rods 5 (see e.g. Figs 1, 3, 5, 7 and 8).

[0019] The locking element 1 is biased, via the carrier 3 by a spring 4 towards the rods 5 wherein at the bottom edge of each of the rods 5, several spaced apart pairs of corresponding recesses 2 are formed that are arranged transversally against each other for snapping of the locking element 1. The pairs of corresponding recesses 2 for snapping of the locking element 1 define the position of the shoulder brace with respect to the firearm. In the example shown, it is the "completely retracted" and "completely extended" position and several "intermediate positions". The spring 4 bears on a supporting pin 14 (see Figs. 10 and 11).

[0020] The locking element 1 can be pushed out of the recess 2 with the use of a control button 12 that acts on the carrier 3 against the direction of the action of the spring 4. The control button 12 is seated in a vertically sliding way over the handle 11 in such a way that it passes through the holder 15 of the trigger mechanism and the housing 16 of the breech. In the control button 12, a transversal pin 13 is arranged that may bear on the protruding projections of the carrier 3 from above (see Figs. 10 and 11).

[0021] During handling of the shoulder brace 7, the control button 12 is pressed downwards (see Fig. 11) so that the transversal pin 13 compresses the protruding projections of the carrier 3 against the direction of the action of the spring 4, and the carrier 3 is thus tilted downwards about the axis 6 (see Fig. 2) and pushes the locking element 1 out of the respective pair of corresponding recesses 2 at the bottom edge of the rods 5. Then, the unlocked shoulder brace 7 can be extended or retracted as necessary.

[0022] On releasing the control button 12 (see Fig. 10), the spring 4 pushes the carrier 3 together with the locking element 1 upwards, so the locking element 1 slides on the bottom edges of the rods 5 until it snaps into the nearest pair of recesses 2.

1

locking element

2

recess

3

carrier

4

spring

5

rod

6

carrier axis

7

shoulder brace

8

hole for carrier axis

9

groove

10

firearm chassis

11

handle

12

carrier control button

13

transversal pin

14

supporting pin of the spring

15

trigger mechanism holder

16

breech housing

17

guide

Claims

1. A handheld firearm with an adjustable shoulder brace (7) that is seated in a firearm chassis (10) using a pair of rods (5), slidingly mounted in a guide (17), wherein the current position of the shoulder brace (7) is lockable by a locking mechanism that comprises a transversal locking element (1), seated vertically adjustably under the pair of arms (5) wherein both the opposite ends of the locking element (1) are guided in opposite corresponding vertical grooves (9) formed in the firearm chassis (10) and the locking element (1) is biased by a spring (4) towards the rods (5) where at the bottom side of each of the rods (5), at least two spaced apart pairs of corresponding recesses (2) are produced for snapping of the locking element (1) and the locking element (1) can be manually pushed out of the recesses (2) by means of a control button (12), characterized in that the locking element (1) is attached to a carrier (3) wherein the carrier (3) is seated in the firearm chassis (10) in a swinging way about an axis (6) that is arranged in a hole (8) in the firearm chassis (10) between the rods (5).

2. The handheld firearm according to claim 1, characterized in that the control button (12) is seated in a vertically sliding way in a holder (15) of the trigger mechanism and in the breech housing (16) wherein a transversal pin (13) that bears on the carrier (3) from above passes through the control button (12) and the control button (12) acts on the carrier (3) against the direction of action of the spring (4).

Drawing