SK288474B6 - Trigger mechanism for auto-loading weapon, and auto-loading manual weapon - Google Patents

Abstract

The trigger mechanism of the auto-loading weapon enabling to select a suitable shooting operation by a single control element, which shooting operation is either single action/double action operation (SA/DA) with the safe hammer (7) activation having the possibility to lock the cocked hammer, or the exclusive double action operation (DAO). The trigger mechanism consist of the swivel (23), the main catcher (9.1 ) of the hammer and the auxiliary catcher (9.2) of the hammer, equipped with the means for the mutual collaboration and for the collaboration with the hammer (7), wherein the swivel (23) is placed in revolving and adjustable position, and it is controlled by the control element (22) on the weapon surface.

Description

Technical field

BACKGROUND OF THE INVENTION The present invention relates to a combined firing mechanism with a percussion hammer which allows firing in single-acting and double-acting modes with the possibility of securing and controlled triggering of the hammer and firing in exclusively double-acting mode as well as a self-loading manually operated weapon. shooting.

BACKGROUND OF THE INVENTION

Trigger mechanisms used in semi-automatic weapons are:

Single action trigger SA - Single Action where pressing the trigger can release the percussion mechanism and thus firing only when the shooter himself or by moving the slide after the previous shot first strikes the percussion mechanism so that the percussion hammer remains caught in the tensioned position. This mechanism can also be supplemented by a manual fuse.

Double action trigger mechanism D A - Double Action, works by pressing the trigger shooter cocks the percussion mechanism until the percussion hammer is triggered and the charge is fired. The drum hammer is in the forward position or on the safety tooth.

Combination of single-action and double-action trigger mechanism SA / DA. Trigger mechanisms of this type in various design variants are described in CZ 301749 B6, US 4,028,836, US 7,257,918 B2, US 6,381,892 B1, US 6,341,442 B1. These documents do not address safe hammer lowering and use in solely double-action mode.

DC (decocker) trigger mechanisms with safe hammer lowering, ie. j. with controlled hammer lowering are described, for example, in CZ 293 435 B6, US 6 718 680 B2, US 6 481 139 B2, US 6 588 136 B2. The weapons described in these documents cannot be used in the dual action mode (DAO) only.

Triggers with a purely double-action mode are described e.g. in EP 1 472 501 B1, but this does not allow the use of the SA / DA regime.

EP 0 730 135 B1 and EP 2 525 185 A1 disclose firearms with a single-action and double-action firing mechanism, with the possibility of being used exclusively in the double-action mode, but this modification of the firing mechanism requires some components of the firing mechanism to be replaced or disabled. into the design of the weapon and it is not possible to control the weapon.

Multifunctional trigger mechanism with the possibility of switching multiple firing modes by means of the control on the weapon is described in the document SK 279 478 B6, but it does not solve the safe triggering of the hammer in the single action, which is important from a safety point of view.

SUMMARY OF THE INVENTION The object of the present invention is to provide a single-action and double-action, single-action, single-action, anti-firing mechanism, with a secure triggering of a cocked hammer and exclusively double-action (SA / DA + DC and DAO) for self-loading weapons. the need to dismantle the weapon.

SUMMARY OF THE INVENTION

The drawbacks of the prior art are eliminated by a trigger mechanism for a self-loading weapon that allows single arms controls to change the firing mode to a single-action / double-action mode with a secure hammer release with the option of securing the hammer and firing only in the double-action mode. The trigger mechanism includes a pin which is provided with an edge groove to control the main hammer engagement to set exclusively the double-action mode and safely lower the percussion hammer and recess to retract the main engagement when deflected from the percussion hammer and part of the cylinder hammer pin engagement.

The main hammer catch has a tooth for engaging the percussion hammer tooth and a protrusion to control the deflection from engaging the percussion hammer using a pivot in DAO mode and safely lowering the hammer. The main hammer catch has an area for deflection from the hammer by a pull rod and a protrusion for securing in SA / DA mode by means of a pin.

The hammer auxiliary catch has an area that the hammer strikes when safely lowered.

The percussion hammer has a tooth for engagement with the main hammer catch tooth in single-action mode and an area for engaging the hammer auxiliary catch when safely lowered.

The trigger mechanism of the present invention consists of a pivotally arranged pivot, a main hammer catch and an auxiliary hammer catch which are provided with means for interacting with and interacting with the hammer, the pivot being pivotally adjustable and actuated by a control element on the surface of the weapon.

Another object of the present invention is to provide a self-loading weapon, in particular a pistol with the option of selecting a suitable firing mode by means of a control element located on the surface of the weapon, namely single / double action (SA / DA mode) with safe hammer lowering. Double Acting (DAO) mode. The weapon according to the invention consists of a handle in which a container is provided, provided with guides and comprising a trigger mechanism according to the invention, an auto-fuse, an auto-fuse lever, and a slide is displaceably arranged in the guides of the container. The trigger mechanism of the present invention consists of:

a pin comprising an edge for controlling the main hammer engagement in DAO mode and for safely lowering the hammer, a recess that engages the main engagement when deflecting to release the hammer in SA / DA mode and a portion of the cylindrical surface to secure the main hammer engagement;

- the main hammer catch equipped with a hammer catch tooth in SA mode, the main hammer catch further includes a protrusion for controlling deflection engagement with the hammer by the pivot in DAO mode and when the hammer is safely lowered, the deflection engagement surface by the hammer and a protrusion for locking in SA / DA mode by means of a pin;

- Auxiliary hammer catch, which is equipped with a hammer impact area for safe lowering in DC mode; and

- a hammer that is equipped with a catch to be retained with the main hammer catch in single-action SA mode and the surface on which the hammer auxiliary catch engages when the hammer is safely lowered, these trigger mechanisms being arranged to cooperate and select appropriate shooting mode by control placed on the surface of the weapon.

The greatest advantage of the mechanism is that the user can choose the appropriate shooting mode himself, as needed in a particular situation, which is not possible with commonly used mechanisms. Thus, by selecting the appropriate mode, you can take full advantage of each mode. The inappropriate choice of the firing mode is not limited to the use of the weapon, but the user loses the comfort and especially the safety offered by the weapon and thus approaches its commonly used standards. The size of the caliber of a hand-held semi-automatic weapon does not affect the function and use of this trigger mechanism. Switching between modes is done with a single control located on the weapon so that there is no need to change the grip of the weapon. The control is double-sided and gives the possibility of the same control when firing a weapon held in the right and left hand.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. A. 1.1 - View of the gun handle

Fig. A. 1.2 - View of the container with the percussion mechanism

Fig. A. 1.3 - View of the conclusion of the weapon

Fig. A. 1.4 - View of the fingerboard position limiter

Fig. A. 1.5 - a view of the locking of the fingerboard by means of locking rivets

Fig. A. 1.6 - View of important design details of selected parts of the mechanism

Fig. A.2.1 - view of the arrangement of parts of the mechanism from the right

Fig. A.2.2 - view of the arrangement of parts of the mechanism from the left

Fig. B.l - view of the gun and the position of the control buttons in the SA-disarmed mode

Fig. B.2.1 - view of the arrangement of parts of the mechanism from the right in the SA-disarmed mode

Fig. B.2.2 - view of the arrangement of parts of the mechanism from the left in the SA-unlocked mode

Fig. B.3.1 - cross section of the trigger mechanism in SA-triggered mode

Fig. B.3.2 - cross section of the trigger mechanism in SA-triggered mode

Fig. Fig. B.4 - cross-section of the trigger mechanism in SA mode, hammer tension manually by means of a bolt Fig. Fig. B.5 - cross-section of the trigger mechanism in SA mode, hammer tension after firing. C.l - view of the gun and the position of the control buttons in SA-locked mode Fig. C.2 - detail view of the arrangement of parts of the mechanism in SA-locked mode Fig. G.3.1 - section of the trigger mechanism in SA-locked mode

Fig. C.3.2 - section of the trigger mechanism in SA-locked mode

Fig. D.l - view of the gun and the position of the control buttons in SA / DA mode

Fig. D.2.1 - view of the arrangement of parts of the mechanism in SA / DA mode

Fig. D.2.2 - View of the arrangement of parts of the mechanism in SA / DA mode

Fig. D. 3 - cross section of the trigger mechanism in D A mode, before the hammer is released

Fig. D.4 - Detail view of the arrangement of parts of the mechanism in DA mode before the hammer is released

Fig. E. 1 - View of the gun and the position of the control buttons in DC mode

Fig. E.2 - Detail view of the arrangement of parts of the mechanism in DC mode

Fig. E.3.1 - cross section of the trigger mechanism in DC mode

Fig. E.3.2 - cross section of the trigger mechanism in DC mode

Fig. F. 1 - View of the gun and the position of the control buttons in DAO mode

Fig. F.2 - detailed view of the arrangement of parts of the mechanism in DAO mode

Fig. F.3.1 - cross section of the DAO trigger mechanism before the hammer is started

Fig. F.3.2 - cross section of the DAO trigger mechanism before the hammer is started

Fig. F.4 - cross section of the DAO trigger mechanism before the hammer is released

Fig. F.5 - Detail view of the arrangement of parts of the mechanism in DAO mode before the hammer is released

DETAILED DESCRIPTION OF THE INVENTION

In this example, the trigger mechanism is used in a self-loading handgun, in particular a pistol, the main parts of which are shown in Figure A. 1.1. The handle 1, Figure A. 1.2. The container 2 and Figure A. 1.3. the container 2 inserted into the handle 1 and the slide 3 with the grooves 101b is movably mounted in the guides 101a on the container 2. In the handle 1 equipped with the trigger 6 the two-sided pull rod 21 is mounted and the right and left sides are provided with locking threads 24. is provided in the container 2, which is provided with a control element 22, in this case a fingerboard and is actuated by the trigger 6. The container comprises a slide slide guide 101a shown in Figure A. 1.3 and comprises grooves 101b for cooperating with the slide slide guides 101a. Figure A. 1.4 shows a detail of the inside view of the handle F See one of the fingerboards 22 there, which is connected to a pin 23 for adjusting the selected position and thereby a suitable firing mode. The handle 1 is provided with a left and right arresting thread 24 with a sprung ball 104d and stop surfaces 103. The inner surface of both fingerboards is provided with a stop 102 for abutment on one of the stop surfaces 103 on the handle 7 and recesses 104a and 104b and a lip 104c 104d of the locking thread 24. In Figures A. 1.5, fingerboards 22 are shown with the pin 23 inserted in three different positions, allowing three firing modes. Figure A. 1.5 on the left shows the locking of the fingerboard with the arresting thread 24 in the SA / DA-locked position where the spring ball 104d is supported on the edge 104c. Figure A. 1.5 in the middle shows the locking of the fingerboard 22 with the locking thread 24 in the SA / DA-unlocked mode position, where the spring ball 104d is supported in the recess 104b. Figure A. 1.5 to the right shows the locking of the fingerboard 22 with the arresting thread 24 in the DAO mode position, where the spring ball 104d is supported in the recess 104a. Fig. A. 1.6 shows the essential components of the trigger mechanism in disassembled state from two different views, namely the pin 23, the main hammer catch 9.1, the auxiliary catch 9.2 of the hammer and the hammer 7. The cap 23 is provided with a recess 122a. which deflects the main catch 9.1. The hammer main catch 9.1 is provided with a tooth 122b to cooperate with the lip 122a of the pivot 23 and a tooth 108b to cooperate with the hammer tooth 108a and a surface 114 to cooperate with the rod 21. The hammer auxiliary catch 9.2 is provided with a bearing surface 109b Figures A.2.1 and A2.2 show a partial cross-sectional view of the arrangement of the individual parts of the trigger mechanism according to the invention with separate sidewalls 35 and fingerboards. The side panels have holes for receiving the axles of the individual components. A trigger 6 is provided on the two-sided drawbar 21 with a projection 106 and a contact 107, which is connected via a drawbar 21 to a mechanism consisting of a hammer main engagement 9.1, hammer auxiliary engagement 9.2, pin 23, hammer 7, firing pin 14 with hammer 110. 7, drum springs 33, hub matches 105, auto fuse lever 48 and auto fuse 13.

Functions of individual components of the trigger mechanism:

The bolt 3 serves to tension the hammer 7 by moving backward after the shot or manually before the firing and through the rod 21 breaks the contact of the trigger 6 with the main hammer catch 9.1 after the firing by the projection 106.

The trigger 6 in the single-action trigger mode (SA) via the handle 21 actuates the main hammer catch 9.1 and the auxiliary catch 9.2 of the hammer. In the dual action mode (D A), the trigger 6 controls the main catch 9.1 and the auxiliary catch 9.2 of the hammer and hammer 7 via the pull rod 21.

In all modes, the trigger actuates the car fuse 13 via the pull rod 21 and the car fuse lever 48.

The hammer 7, together with the percussion spring 33, serves as a source of kinetic energy for actuating the firing pin 14 by striking the surface 110 of the firing pin 14.

Main hammer catch 9.1 in single-action mode (SA) - grips hammer 7 on tooth 108b by tooth 108a in the tensioned position in single-mode operation (SA).

Hammer auxiliary catch 9.2 in safe hammer lowering (DC) mode - captures the hammer 7 by impacting the surface 109b when the hammer 7 is lowered in a position where the hammer 7 does not come into contact with the firing pin 14 and serves as a safety catch in accidental (uncontrolled) release hammers 7 in SA / DA modes with unpressed trigger 6.

Car fuse 13 - (drop fuse) safety element that blocks the firing pin 14 and prevents it from contacting the cartridge until the trigger 6 is pressed to the charge firing position.

The firing pin 14 is moved after striking the hammer 7 on the firing pin surface 110 and strikes the cartridge by striking the firing pin surface 105.

The rod 21 transmits the movement of the trigger 6 to the hammer main catch 9.1 and the hammer auxiliary catch 9.2.

In the double action mode (DA) and exclusively the double action mode (DAO), the rod 21 transmits the trigger 6 movement to the hammer 7. The rod 21 transmits the trigger 6 movement to the car fuse 13 via the car fuse lever 48. The rod 21 breaks the contact of the trigger 6 with the main hammer receptacle 9.1 in the single-action mode (SA) by touching the protrusion 106 on the slide 3 after firing. The rod 21 breaks the contact of the trigger 6 with the hammer 7 by touching the rod 107 on the pin 23 in DA and DAO mode.

The finger 22 is a mechanism control which, via pin 23, switches SA / DA, SA locked, DAO modes and triggers a controlled hammer lowering 7.

The pin 23 is controlled by the movement of the fingerboard 22 and downward movement blocks the hammer main engagement 9.1 and locks the mechanism in SA mode against firing with the hammer 7 taut by preventing movement of the cylindrical surface portion 118a of the hammer main engagement. In SA mode, when hammer 7 is pulled down, when hammer 22 moves downward, hammer 7 releases hammer 7 by bevel edge 122a of hammer main protrusion 9.1b from boss 108b of hammer main retainer 9.1, thereby lowering hammer 7. pressure on the hammer main engagement protrusion boss 122b disables the hammer main engagement 9.1 and switches the mechanism to DAO mode.

The locking thread 24 secures the position of the fingerboard 22 by means of a spring-loaded ball 104d against spontaneous movement.

The bias spring 33 - together with the hammer 7 serves as a source of kinetic energy for actuating the firing pin 14.

The other parts of the trigger mechanism serve to fix the individual main parts in the container and the handle. These include the container 2, the ejector 10, the sidewall 35 and the pins which are used to suspend the individual parts and the spring for positioning and directional movement, the function of which is also evident from the illustration in the other figures.

Function description in each mode:

SA (Single Action) - Figure B.l is an overall view of the weapon with the fretboard in the horizontal position, which in this case corresponds to the triggered single-action trigger mechanism (SA-triggered mode). Figures B.2.1, B.2.2 show the position of the individual elements from the right and from the left in the SA - disarmed mode. In SA mode, the trigger 6 controls the main hammer catch 9.1 and the auxiliary catch 9.2 of the hammer and the car fuse 13 via the car fuse lever 48 via the rod 21. In the SA mode, the hammer main engagement tooth 108b 9.1 is engaged by the hammer tooth 108a, the hammer 7 being always in the tensioned position in the SA mode before firing. In the SA mode, there are three ways of tensioning the hammer 7, namely by manually stretching the hammer 7, manually by means of bolt 3 and bolt 3 automatically after firing. In Figure B.3.1 and Figure B.3.2, the hammer 7 is tensioned directly by manually pressing the hammer 7 in the direction of the arrow 111 where it engages on the tooth 108b of the hammer main receptacle 9.1. Figure B.4 shows the tension of the hammer 7 by manually moving the bolt 3 backward in the direction of the arrow 112, where the bolt 3 presses the hammer 7 by pressing against the surface 113 of the hammer 7, which engages with the hammer tooth 108b 3 returns to the position as in Figure B.3.1 and the mechanism is thus ready to fire. After depressing the trigger 6 in the direction of the arrow 115, the latter rotates around the point 116 and, by moving the handle 21, pushes the surface 114 of the main hammer receptacle 9.1, which deflects into the recess 123 on the pin 23 thereby releasing the hammer 7. After firing, Figure B.5, the slide 3 by moving backwards in the direction of the arrow 117 pulls the hammer 7 by pressing against the surface 113 of the hammer 7, which remains stretched and retained by its tooth 108a on the tooth 108b of the hammer main receptacle 9.1. at the point of the projection 106, the contact of the trigger 6 with the main hammer catch 9.1 breaks. After firing, the slide 3 returns to the position shown in Figure B.3.1 and releasing the trigger 6 releases the mechanism to restore the mechanism to its original configuration, followed by a further firing by pressing the trigger 6 in SA mode. Assuming that the cartridge is in the cartridge chamber, the hammer 7 needs to be tensioned before the first shot. A shot in SA mode is characterized by significantly lower resistance and shorter trigger operation 6 compared to DA and DAO modes, as well as significantly shorter mechanism compared to DAO mode.

SA secured by a manual lock - in Figure C. 1 is an overall view of the weapon where the fingerboards 22 are raised in the SA / DA position - the hammer 7 is tensioned. The position of the fingerboards 22 is secured against spontaneous movement by the locking threads 24. Figure C.2 is a detailed view (the left fingerboard 22 is moved away for better illustration), illustrating the locking principle performed by rotating the fingerboards 22 upwards in the direction of arrow 124 rotating the pin 23 to a position where the cylindrical surface 118a blocks movement of the main hammer receptacle 9.1 at the location of the protrusion 118b against release from the hammer 7. The situation is shown in Figure C.3.1 where the pin 23 blocks movement of the hammer main receptacle 9.1 at 118a and 118b. Fig. C.3.2 shows the position and arrangement of the hammer auxiliary catch 9.2, which, in the secured mode SA, serves as a secondary safety element in case of accidental release of the hammer 7.

DA (Double Action) - also referred to as single action / SA / D A. The overall view of the weapon is shown in Figure D1, where the knobs 22 are in the SA / DA (horizontal) position and hammer 7 is lowered. . The arrangement of the components is shown in Figure D.2.1 and Figure D.2.2. In addition to the mode SA, the hammer 7 can also be tensioned via the pull rod 21 by pushing the trigger 6 in the direction of the arrow 115, engaging the teeth 119 on the hammer 7 and pulling the hammer 7 to the position shown in Figure D.3 and Figure D.4 wherein, by successive pressure up to the position determined by the mechanism, the teeth 119 of the hammer 7 are released from the rod 21 by pushing the rod 21 at a location 120 of the rod 21 by a pin 23 and the released hammer 7 striking the cartridge. At the same time, the rod 21 pushes the auto-fuse 13 through the auto-fuse lever 48, thereby releasing the locked firing pin 14. After the firing, the hammer 7 remains pulled by the bolt 3 on the main hammer retainer 9.1 as shown in Figure B.5. After the reset, the mechanism is ready for the next shot in SA mode, where the arrangement of the parts is as shown in Figure B.3.1. The DA mechanism is always in combination with the SA mechanism, and provided the hub is in the chamber, it is not necessary to have a hammer 7 tensioned before the first shot.

DC (DeCocker) - deactivation of tensioned hammer, it is complemented by SA / DA mechanism by controlled triggering of hammer 7 without shot, even if the charge is in the chamber. Starting from the condition shown in Figure B.3.1 and Figure B.3.2, where the hammer 7 is tensioned. Fig. E.1 is a view of the weapon, showing the situation of controlled firing of the hammer 7 without firing by pushing the buttons 22 downward in direction 121 and the hammer 7 is lowered to the state of Fig. E. 1. A detailed illustration of the arrangement of the parts of the mechanism is shown in Figure E.2. The knobs 22 are rotated by a pin 23 which pushes the hammer main engagement 9.1a at the point of the protrusion 122b by the edge 122a and lowers the hammer 7, which is stopped by the impact of the surface 109a on the surface 109b of the auxiliary hammer catch 9.2. Figure E.3.1 and Figure E.3.2 show the mechanism after a controlled lowering of the hammer 7, where it can be seen that the hammer 7 remains retained at a safe distance from the firing pin 14. Even in the event of failure, e.g. due to mechanical damage to the auxiliary catch 9.2 of the hammer or hammer 7, the firing pin 14 is secured against movement by the auto-fuse 13 and the firing does not occur.

DAO (Double Action Only) - only double action mechanism, overall view of the weapon is shown in Figure F. 1, where the buttons 22 are in the DAO position, the hammer 7 is lowered. The position of the fingerboard is secured against spontaneous movement by the locking threads 24. Figure F.2 shows the arrangement of the parts where switching to DAO firing mode is effected by pushing the fingerboard downwards, turning the pin 23 which pulls the main hammer catch 9.1 by edge 122a by pushing the projection. 122b and put it out of operation. Figure F.3.1 and Figure F.3.2 show the ready-to-fire mechanism in DAO mode. By pressing the trigger 6 in the direction 115, the hammer 7 is pulled by means of the rod 21 over the teeth 119 and the pressure is continued to the position determined by the mechanism of Fig. F.4 and Fig. F.5. the firing pin 14 detonates a charge. At the same time, by pulling on the car fuse lever 48, the rod 21 lifts the car fuse 13 and releases the firing pin 14 before firing. After the firing, the hammer 7 remains unstretched and returns with bolt 3 to the firing position as shown in Figure F.3.1 and Figure F.3.2. The hammer 7 is retarded by the surface 125 of the bolt 3 in order to prevent firing when it hits the firing pin. After resetting the mechanism, the next shot follows again in DAO mode. The hammer tension 7 is characterized by increased resistance and a long run of the trigger 6, as well as a long design of the trigger mechanism.

Trigger Reset - An action required to re-engage the firing mechanism after the trigger 6 and main hammer catch 9.1 break after firing as in Figure B.5, where the bolt 3 at the projection 106 pushes the handle 21. The trigger is reset by moving the trigger 6 forward against movement 115 by self-expanding the spring 30 into the trigger position 6 before firing as in Figure B.3.1 in SA mode or Figure F.3.1 in DAO mode.

PATENT CLAIMS

Claims (7)

1. Self-loading weapon trigger mechanism, allowing single firing controls to select the appropriate firing mode, namely single-action / double-action (SA / DA) with safe hammer lowering (7) with the possibility of securing the hammer tight and exclusively double-action (DAO) containing the trigger (6) by which a hammer (7) is operated via a two-arm linkage (21), characterized in that it consists of a pivotably arranged pivot (23), a main hammer catch (9.1) and an auxiliary hammer catch (9.2) provided with means to cooperate with each other and to cooperate with the hammer (7), the pin (23) being rotatably adjustable and actuated by a control element (22) on the surface of the weapon. Trigger mechanism according to claim 1, characterized in that the pin (23) for cooperating with the main hammer receptacle (9.1) is provided with an edge (122a), a recess (123) and a cylindrical surface portion (118a); and the main hammer catch (9.1) for engaging the pin (23) is provided with a projection (122b) for cooperating with the edge (122a), a tooth (118b) for cooperating with a portion (118a) of the cylindrical surface of the pin (23) and for working with a two-arm drawbar (21). Trigger mechanism according to claim 1, characterized in that the hammer auxiliary catch (9.2) is provided with a surface (109b) for cooperating with the hammer (7) and the hammer is provided with a bearing surface (109a) for bearing the hammer auxiliary catch (9.2). Trigger mechanism according to claim 1, characterized in that the stub control element (22) 5 on the surface of the weapon is accessible from the right and left sides of the weapon in the form of fingerboards. 5. A self-loading weapon, in particular a pistol with the option of selecting a suitable firing mode by means of a control on the surface of the weapon, namely a single-action / double-action (SA / DA) with safe hammer lowering (7); of purely double-action mode (DAO), consisting of a handle (1) in which a container (2), equipped with guides (101a) and containing a trigger A mechanism, an auto-fuse (13), an auto-fuse lever (48), and a slide (3) displaceably disposed in the guides (101a), characterized in that a trigger mechanism according to any one of claims 1 to 4 is disposed in the container (2). comprising a pivot (23) comprising an edge (122a) for actuating the main hammer grip (9.1) in DAO mode and for safely lowering the hammer (7) and a recess (123) in which the main grip (9.1) engages when deflected to release SA / DA mode hammer (7) and cylindrical surface portion (118) 15 securing the main engagement (9.1) of the hammer; a main hammer catch (9.1) having a tooth (108b) for engaging the hammer (7) in SA mode, the main hammer catch (9.1) further comprising a projection (122b) for controlling deflection from the hammer (7) by means of a pin ( 23) in DAO mode and when the hammer (7) is safely lowered, the flat (114) to deflect the hammer (7) by means of the handle (21) and the projection (118b) to secure in SA / DA mode by means of the pin (23) ; an auxiliary hammer catch (9.2) provided with a face (109b) for engaging the hammer (7) upon safe lowering in DC mode; and a hammer (7) which is provided with a tooth (108a) for engagement with the main hammer catch (9.1) in single-action SA mode and a surface (109a) on which the auxiliary hammer catch (9.2) engages when the hammer (7) is safely lowered. 25 16 drawings