Extraction unit for a firearm

Abstract

The invention relates to a trigger unit 2 for a firearm, comprising a hammer 21 rotatably mounted about a hammer axis 212 and pre-tensioned by means of a hammer spring 211, a trigger lever 26 rotatably mounted about a trigger axis 262, which integrally comprises a trigger blade 264 and a trigger back section 263, which is designed to receive at least one interrupter 3, and a detent element 4 rotatably mounted about a detent element axis 43 and pre-tensioned by means of a detent element spring 41, wherein the detent element 4 is arranged at least partially within the trigger lever 26 such that the detent element axis 43 and the trigger axis 262 coincide, and the detent element 4 has on its upper side a bearing recess 42 for receiving and limited rotation about an interrupter axis 35 of an interrupter joint 32 formed on the underside of the interrupter 3.wherein the bearing recess 42 is designed to at least partially enclose the breaker joint 32 in the direction of rotation about the breaker axis 35.

Description

[0001] The invention relates to a two-stage trigger unit, also called a trigger mechanism, suitable for handguns, especially for M4 / M16 / AR15 rifle-type firearms, according to the preamble of claim 1 and US 2016 / 363401 A1. The invention and its variants are not limited to rifles, carbines, etc., but can also be used for pistols. The improvements and their effects / advantages are listed below.

[0002] US 2016 / 363401 A1 discloses a trigger system with hammer, which, as can be seen in particular from Fig. 7As can be seen, both a breaker and a spring-loaded locking element are rotatably mounted in a recess in the trigger. The hammer and trigger, both spring-loaded, can also be rotated in a single component using needle bearings. The various springs and components must be housed in very confined spaces, and the strict geometric conditions required for the device to function pose problems, even when servicing and maintaining it in an armory using special tools.

[0003] Since such trigger units can be used as an interchangeable module in existing weapons and the weapons themselves only provide the geometric and functional boundary conditions, the invention primarily relates to such a trigger unit and only secondarily to a weapon with such a trigger unit.

[0004] A modern trigger unit should generally be easy to operate, reliable, easy to maintain, and adjustable between a "safe" and at least one "unlocked" position. Many such trigger units, especially for AR15-type rifles, which are discussed here with preference, feature a design that prevents the selector from being moved to the "safe" position when the hammer is in the released position. This is often due to the fact that the trigger lever, comprising a trigger catch (often referred to as the "safety lever"), the trigger blade, and the trigger catch (usually referred to as the "sear") that interacts with the hammer (also referred to as the firing pin), is constructed as a single piece. Examples include US 10,330,413 B2, EP 2 950 033 B1, and US 7,600,338 B2, which clearly illustrate these relationships.

[0005] Furthermore, it is important to provide the shooter with a trigger unit that requires a two-stage resistance build-up until the shot is fired. These trigger resistances should be perceptible and distinguishable by the shooter when the trigger is pulled. Here, too, a variety of two-stage trigger units are known, which feature a first trigger resistance (e.g., "pre-trigger resistance") and a second trigger resistance (e.g., "main trigger resistance"). Overcoming the first and second trigger resistances is often referred to as "first stage" and "second stage" in English. US 7,600,338 B2 and US 2019 / 257606 A1 are representative of the many different design options, as very different components are responsible for the mechanism of action.

[0006] The object of the present invention is therefore to provide a trigger unit that enables the firearm to be secured when the hammer is released. A further object of the invention is to provide a two-stage trigger unit with different trigger pulls. Furthermore, a further object of the invention is to provide a trigger unit that is easy to handle, easy to maintain, and relatively easy to replace, as a "drop-in trigger unit."

[0007] This object is achieved by the features specified in the characterizing part of claim 1. In other words, the locking element with its locking element axis and the trigger lever with its trigger axis form a common axis of rotation, wherein the locking element has a bearing recess on its upper side for receiving and limited rotation about a breaker axis of a breaker joint formed on the underside of the breaker, and wherein the bearing recess is designed to at least partially enclose the breaker joint in the direction of rotation about the breaker axis.

[0008] In this way, the hammer, which is mounted rotatably about a hammer axis and preloaded by a hammer spring, is no longer blocked by the trigger lever when fired. The trigger lever, which is mounted rotatably about the trigger axis, comprises an integrally formed blade and a trigger rear section, which is designed to accommodate at least one breaker. The inventive design and arrangement, or rather the interaction, of the locking element, breaker, and trigger lever enable the selector to be adjusted in the fired state up to the "safety" position, since the trigger rear section can be easily deflected in this state.

[0009] The bearing recess and the breaker joint are essentially designed to complement each other in shape and size, allowing for limited rotation around the breaker axis. Assembly can be accomplished relatively easily by sliding them together sideways, as explained in more detail in the figure description. This also protects the trigger unit components from loss when installed.

[0010] Throughout the description and claims, "forward" or "forward" refers to the direction toward the muzzle of the barrel, "backward" refers to the direction toward the stock, "downward" refers to the direction of the bolt toward the magazine, and "upward" refers to the direction away from the magazine. The terms "weapon centerline," "barrel bore," "barrel axis," "bore axis," etc., have the usual meanings assigned to them by a person skilled in the art. "Left" thus refers to the weapon centerline, while "from the left" corresponds to a movement, actuation, or application of force toward the weapon centerline, starting from a starting position to the left of it, etc. The bolt is moved "backward" under the action of the gases after firing a shot and returns "forward" under the action of a recoil spring, etc.

[0011] The invention is explained in more detail below with reference to the drawings, in which: the Fig. 1 , purely schematically in a perspective exploded view a lower housing with magazine holder and grip, as well as a trigger unit, continuous fire group, selector and slide; the Figs. 2a,b a schematically illustrated trigger unit assembled in a trigger housing in a perspective view and a top view; the Fig. 3 a schematic exploded view of a drop-in trigger unit; the Figs. 4a,b an enlarged schematic representation of the interrupter and the locking element; in assembled state and an enlarged section "C" in the area of ​​the spring recess of the locking element from Fig. 4a ; the Figs. 5a-d a schematic sectional view along the plane AA' or BB' from Fig. 2b ) before firing or in the selector position "Safe" in various positions on the empty pull; the Figs. 6a,b a schematic sectional view along the plane AA' or BB' from Fig. 2b) for the selector position "Single fire" in the release position; the Figs. 7a,b a schematic sectional view along the plane AA' or BB' from Fig. 2b ) for the selector position "continuous fire" in the hammer catch position; the Figs. 8a,b a schematic sectional view along the plane AA' of Fig. 2b ) for a trigger group in fired condition - hammer in striking position - with selector position "Continuous fire" (a) or "Safe" (b); the Fig. 9 the detail "D" from Fig. 5 a) ; the Fig. 10 the detail "E" from Fig. 5 c) and the Figs. 11a,b two prismatic adjustment elements in detail.

[0012] In the context of the invention, a trigger unit suitable for installation in a firearm, preferably a rifle, is designated in its entirety by "2." This explicitly also includes a "drop-in trigger unit," i.e., a "built-in or retrofit module," which pre-assembles the trigger unit 2 according to the invention in a trigger housing 23 and facilitates installation in a firearm.

[0013] In the figures of the drawings, an attempt was made to designate everything relating to the trigger unit 2 with "2n", as well as analogously with "21n" for the hammer, "3n" for the interrupter, "4n" for the locking element, "5n" for the continuous fire unit and "6n" for the selector.

[0014] It is clear to the person skilled in the art that the illustrated embodiments were chosen as schematic and / or exemplary representations and that it is easily possible for the person skilled in the art, with knowledge of the invention, to transfer the relationships according to the invention to embodiments not explicitly shown, which is why these implicitly disclosed embodiments are to be read silently both in the description of the figures and in the claims.

[0015] In the Figs. 1 to 11 Primarily, embodiments of the invention are shown that are suitable for use in an AR15 or M4 type rifle. Modifications can also be easily applied to other rifle types by a person skilled in the art, given knowledge of the invention, without extensive or complex testing.

[0016] The Fig. 1shows a schematic exploded view in which a trigger unit 2, depicted as a drop-in trigger unit, is shown before being inserted into a lower receiver 1 of a rifle. In the normal direction 93 (vertical) above the trigger unit 2, a slide 11 is shown, which in the rest position of the weapon, i.e., before firing, is mounted above the trigger unit 2 in an upper receiver (not shown). Furthermore, a grip 12, a magazine holder 14, and a slide stop lever 15 can be seen on the lower receiver 1 in the installed state. Likewise, Fig. 1 a continuous fire group 5 and a selector 6 can be seen in exploded view, which are not to be seen as part of the trigger unit 2 according to the invention, but are to be described for their function.

[0017] Furthermore, Fig. 1 and 2bIt can be seen that the continuous fire group 5 comprises, in the usual way, a continuous fire element 51 and a continuous fire spring 52, as well as a sleeve and a pin for fixing in the housing 1. Likewise, the selector 6 in the form shown comprises two actuating elements and a control shaft 61, wherein the control shaft 61 is arranged inside the housing 1 and can be adjusted in its angular position from the outside by the two actuating elements, i.e. by rotation about the transverse direction 92. The control shaft 61 has a geometry which, depending on the position of the selector 6, interacts with different parts of the trigger unit 2 through the formation of differently shaped cams along the control shaft 61. The control shaft 61 is essentially designed as can be seen from, for example, DE 20 2011 004 556 U1 or EP 2 950 033 B1.

[0018] In Fig. 2aAn assembled drop-in trigger unit can be seen in a perspective view, depicted in the rest position. It should be noted again at this point that the trigger unit 2 according to the invention can theoretically also be installed without a trigger housing 23, i.e., directly into the lower housing 1, provided minor adaptations, such as a support for the locking element spring 41, are provided in the housing 1. The illustrations show the preferred design as a drop-in trigger unit.

[0019] In Fig. 2b The rest position of the trigger unit 2 can be seen in a top view and in conjunction with Fig. 3 explained: A hammer 21, also often referred to as a striker, is mounted in the trigger housing 23, more precisely in a bearing sleeve 24, so that it can rotate about a hammer or striker axis 212. The interrupter 3, which is arranged within the trigger lever 26, is also clearly visible. Fig. 2bFurthermore, the superimposed representation of the trigger unit 2 with the continuous fire group 5 and the selector 6 can be seen, as it corresponds to the installation situation and in conjunction with Fig. 1 becomes clear.

[0020] The Fig. 3 shows a further exemplary representation of the trigger unit 2 in an exploded view, wherein the dashed lines are to be seen as reference lines to clarify the position of the components relative to one another in the installed situation. The illustration clearly shows the multi-part design of the trigger unit 2 according to the invention, wherein in particular the trigger lever 26 has no significant protrusion, i.e. no dedicated front section, in the running direction 91 to the front, as is very frequently seen in the prior art. The mechanical engagement on the hammer 21 or its release cam 215 (e.g. Fig. 5) does not take place directly with the trigger lever 26, but indirectly via a separately formed locking element 4. According to the invention, the locking element 4 and the trigger lever 26 have a common axis of rotation in the installed situation, which axis is accordingly referred to both as the trigger axis 262 and as the locking element axis 43. In addition, the locking element 4 is connected to a breaker 3 according to the invention in such a way that the locking element 4 has a bearing recess 42 on its upper side for receiving and limited rotation of a breaker joint 32 formed on the underside of the breaker 3. A bearing recess 42 encloses the breaker joint 32 at least partially in the direction of rotation about the breaker axis 35, which runs in the transverse direction 92 through the breaker joint 32. In the installed situation, this allows a limited rotation of the breaker about the breaker axis 35 and, through the formation of a common locking element axis 43 orThe locking element 4 and the interrupter 3 are mounted on the trigger axis 262, allowing them to be tilted individually and jointly, or rotated within limits. The locking element 4 and the interrupter 3 are at least partially accommodated laterally by the trigger lever 26.

[0021] It can also be seen that in the installed situation, a locking element spring 41 is held on both sides of the trigger lever 26 by the bearing sleeve 24 in the trigger unit 2. The curved rear continuous leg of the locking element spring 41 engages in the illustrated embodiment, see also e.g. Fig. 5a ,on the underside of the trigger housing 23. This type of spring support can also be achieved by a person skilled in the art in other ways, such as by providing corresponding support points on the inside of the lower housing 1. However, according to the invention, the two loose ends of the locking element spring 41 are supported on the underside of the locking element 4 at locking element spring supports 412 provided for this purpose. This biases a trigger edge 44 of the locking element 4 upward, toward the hammer 21.

[0022] The hammer 21 is pre-tensioned in the installed position by means of a corresponding hammer spring 211. The hammer spring 211 is tensioned in the usual way with the middle connecting piece from below against the hammer 21 and can be counter-supported by the bearing sleeve 24, which holds the trigger lever 26. In the illustrated embodiment, as can be seen from the overview with Fig. 3As can be seen, laterally projecting hammer spring supports 261 can be provided on the trigger lever 26, which act as abutments for the hammer spring 21 and thus prevent the hammer spring 21 from resting on the detent element spring 41. The inventive support of the hammer spring 21 on the hammer spring supports 261 provided for this purpose, but essentially also on the bearing sleeve 24 or the detent element spring 41, also results in a force transmission that presses the trigger lever 26 with its trigger rear part 263 downward in the normal direction 93. This relationship is advantageous for the design of the trigger unit 2 according to the invention, since it transmits a force to be overcome to the trigger lever 26 and thus, perceptibly for the shooter, to the trigger blade 264, which is perceived as the first stage (often referred to as the "1st stage") and defines the resistance during the idle pull, which will be explained later.

[0023] The expert will be able to analyze the following Figs. 5 to 11 It is clear that the objects of the invention can be achieved using the exemplary, one-piece components, in particular the trigger lever 26, the locking element 4, the interrupter 3, and the hammer 21. It should be noted here that multi-part locking elements 4 and / or interrupters 3 are also conceivable, which interact in an analogous manner.

[0024] In Fig. 4a and 4bThe locking lever 4 and the interrupter 3 are shown enlarged. The interrupter 3 has a hook 31 on its top side, which interacts with the hammer hook 213. At its rear end, the interrupter 3 has a rear section 33, which, as shown, can have a smaller extent in the transverse direction 92 than the middle or front section. This makes it easier to receive / insert it into the trigger rear part 263. As shown, the interrupter 3 can have a type of support nose formed in the front section for guidance along the top side of the locking element 4. The guidance and / or support on the top side of the locking element 4 can, however, also be achieved by an alternative, functionally identical design of the pairing of bearing recess 42 and interrupter joint 32.

[0025] The breaker 3 has on its underside a breaker joint 32, which serves for receiving and rotatably supporting the upper side of the locking element 4 and which defines a breaker axis 35 in the transverse direction 92. Furthermore, a receptacle for a breaker spring 34 is formed on the underside of the breaker 3. This in cross section, for example, in Fig. 5a The receptacle, which is more clearly visible, is adapted in diameter and depth to the interrupter spring 34 in such a way that it is secured against slipping out sideways.

[0026] In a special embodiment, the locking element 4, as shown in detail C in Fig. 4b Shown enlarged, it has a spring recess 46. This spring recess 46 is formed on the upper side, i.e., facing the breaker 3, and, like the receptacle in the breaker 3, serves to at least partially accommodate and secure the breaker spring 34 against loss.

[0027] In the advantageous further development shown, the spring recess 46 is partially open in at least one transverse direction 92, which facilitates assembly since the interrupter spring 34 does not have to be compressed so far in order to be able to be inserted into the recess or receptacle.

[0028] A further aid during assembly is provided by a ramp 461 provided laterally in the area of ​​the opening to the spring recess 46. Due to the rise of the ramp 461 in the direction of the spring recess 46, the interrupter spring 34 can be inserted more easily from the side, i.e. moved over it.

[0029] In all described cases, however, the function of the interrupter spring 34 is the same, in that it preloads the interrupter 3 around the interrupter axis 35, i.e., essentially upwards in the direction of the hammer hook 213. The bearing recess 42 is essentially designed to complement the shape and function of the interrupter joint 32, whereby, in addition to the receptacle, a partial rotation of the interrupter 3, i.e., within defined limits, is enabled. The assembly of the locking element 4 and the interrupter 3 is therefore achieved by sliding from one side in the transverse direction 92, whereby spontaneous disassembly or falling apart during operation is prevented by the lateral limitation within the trigger housing 23 or lower housing 1 of the firearm.

[0030] In the Figs. 5 to 8 The function of the trigger unit 2 is described in more detail. The sectional views of the different rest and working positions of the Fig. 5a, 5c , 6a, 7a, 8a and 8b correspond to a side view through the median plane along the section line A-A', as exemplified for the rest position in Fig. 2b The sectional views of the different resting and working positions of the Fig. 5b, 5d , 6b and 7b correspond to a side view through the plane along the section line B-B', as exemplified for the rest position in Fig. 2b , which essentially corresponds to a side view without the "left side wall" of the trigger housing 23. The rest position 71, the first trigger stage 72 (1st stage), and the second trigger stage 73 (2nd stage) are indicated by dashed lines in the area of ​​the trigger blade 264 and / or the trigger rear part 263.

[0031] In the Figs. 5a and 5b The rest position 71 of the trigger unit is shown. The hammer 21 is cocked, i.e. the hammer spring 211 tries to rotate the hammer head counterclockwise around the hammer axis 212 ( Fig. 2) and rests on the hammer spring supports 261. In the area of ​​the hammer axis 212, the hammer 21 has at least one release cam 215 on its outer surface, which is held in the rest position by a release edge 44 of the locking element 4. The release edge 44 is preloaded against the hammer 21 by the locking element spring 41 by engaging the locking element spring supports 412. The trigger lever 26 is, as shown, preferably integrally formed and has a blade 264 that projects substantially downwards in the normal direction 93. In addition, the trigger lever 26 has a receiving opening in its central section and in the rear direction in the trigger rear part 263 for receiving the locking element 4 and the interrupter 3.

[0032] In Figs. 5a and 5bIt can be clearly seen that the trigger 264 of the rest position 71 is preloaded by the hammer spring 211, as the trigger lever 26 is pushed downward. It can also be clearly seen that the selector 6 is in the "safe" position, with the control shaft 61 partially blocking the breaker 3 at the rear section 33 at the top and preventing upward deflection.

[0033] A comparative analysis of the Figs. 5c and 5dshows that upon application of an initial force to the trigger 264, a slight deflection to the rear is possible, whereby the trigger rear part 263 is rotated upwards until the trigger lever 26, on its inner surface 25, comes into contact with the underside of the locking element 4 in the contact area of ​​detail D. This slight free travel is also referred to as the idle pull and can be clearly perceived by the shooter due to the retention force of the hammer spring 211 on the trigger lever 26. This initial trigger resistance is thus perceived between the rest position 71 and the end of the idle pull. The end of the idle pull is thus referred to as the first trigger stage 72, which in the Anglo-American language is also often referred to as the "first stage". The first trigger stage 72 of this two-stage trigger unit 2 can, as in Figs. 5c and 5dThe construction according to the invention also enables the same perception of the first trigger stage 72 when the firearm is unlocked, e.g. when the selector 6 is switched to the "single fire" or "continuous fire" position, as a comparison with the Figs. 6 and 7 shows.

[0034] In Figs. 5c and 5d The rest position 71 of the trigger 264 and the trigger rear part 263 are clearly visible in dashed lines. Further deflection of the trigger 264 beyond the first trigger stage 72 is prevented in the "safety" position by the upper side of the trigger rear part 263 resting on both sides against correspondingly shaped sections of the control shaft 61.

[0035] Detail D from Fig. 5a is enlarged in Fig. 9shown. Particularly advantageous embodiments can be derived from this, which, for example, consist of a locking element extension 45 formed on the underside of the locking element 4. This allows a defined contact position between the inner surface 25 of the trigger lever 26 and the underside of the locking element 4, whereby friction can be minimized and the reaching of the first trigger stage 72 can be perceived more effectively. A further embodiment comprises the bevel of the inner surface 25 sloping backwards, as in Fig. 9 This beveled surface can also advantageously influence the force transmission between the trigger rear part 263 and the locking element extension 45 by being essentially at a right angle—provided the bevel is designed at the appropriate angle. This allows for very precise triggering of the trigger unit and reaching the first trigger stage 72.

[0036] From the context and the description, it is easy to understand that it is possible to provide different locking elements 4, which have locking element extensions 45 projecting to different extents. These locking element extensions 45 can be designed as shown in Fig. 9 shown integrally formed on the locking element 4. In this way, a fine adjustment of the idle pull can be performed by selecting the desired remaining distance between the inner surface 25 and the locking element extension 45 of the respective locking element 4. Analogously, an adjustable adjusting device 451, preferably designed as an adjusting screw (e.g., grub screw, worm screw) or also a prismatic adjusting element 451, can function to adjust the part of the locking element extension 45 that protrudes on the underside.

[0037] In Fig. 11a and 11bTwo prismatic adjustment elements 451 are shown as examples, which can be inserted laterally into a recess of the locking element 4 corresponding to the rough outer contour of the prism. Due to the differently rounded edges of the prismatic adjustment element 451, a locking element extension 45 can be formed by inserting it into the desired position, which protrudes to different extents from the underside of the locking element 4, as a comparison of the Figs. 11a and 11b clearly shows. The adjusting elements 451 are designed to be sufficiently wide in the transverse direction 92 to ensure stable mounting in the corresponding recess of the locking element 4. The prismatic adjusting elements 451 are exemplified as three-sided prisms, although four-, five-, or even multi-sided prisms are also conceivable in principle.

[0038] A complementary, or alternative, possibility for fine adjustment would be to provide different trigger levers 26 with correspondingly adapted inner surfaces 25.

[0039] In Fig. 6 The situation is shown in which the selector 6 is set to the "single fire" position and the control shaft 61 with the corresponding sections allows a slight further rotation of the trigger rear part 263 around the trigger axis 262. By the previously described Fig. 5The sufficiently described function of the trigger unit 2 until the first trigger stage 72 is reached, a second, usually higher, trigger resistance is perceived upon further deflection of the trigger blade 264 to the rear. This second trigger resistance results in part from the direct force transmission of the trigger lever 26 to the locking element 4, since the latter must be rotated together around the trigger axis 262 after the locking element 4 makes contact with the inner surface 25. The hammer spring 211 still attempts to press the trigger lever 26 downward. On the other hand, the release edge 44 of the locking element 4 must be disengaged from the release cam 215 of the hammer 21. Figs. 6a and 6b Therefore, the rest position 71 and the first trigger stage 72 are indicated schematically as dashed lines on the trigger 264, before reaching the second trigger stage 73 by releasing the trigger edge 44 from the trigger cam 215. The continuous fire unit 5 is as in Fig. 5 still shown in its resting position.

[0040] A further deflection of the trigger 264 to the rear, i.e. a further upward movement of the trigger rear part 263, is limited by the control shaft 61. By releasing the hammer 21, it is rotated around the hammer axis 212 (see e.g. Fig. 8a ) and accelerated within the central recess of the slide 11 onto the firing pin. The interrupter 3, due to the pretension of the interrupter spring 34, attempts to rotate upwards around the interrupter axis 35, which is enabled at least within certain limits by the position of the selector 6, until the rear section 33 on the upper side contacts the corresponding section of the control shaft 61. This, of course, only applies if the trigger 264 is pulled – relieving the rein would again require overcoming the initial trigger resistance, etc.

[0041] Since, after the shot is fired, the bolt opens and the slide 11 moves rearward, the hammer 21 rotates rearward again and, in this position, is caught by the hook 31 of the interrupter 3 with its hammer hook 213. The slide 11 is moved forward again by a recoil spring, whereby a new cartridge is fed from the magazine into the cartridge chamber of the barrel and the bolt head is locked with the barrel.

[0042] The hammer 21 is thus caught by the breaker 3 after each shot during "single fire." Before firing another shot, the preload of the breaker 3 must first release the trigger 264 far enough forward that the trigger edge 44 is again positioned in front of the trigger cam 215. Further forward movement of the trigger 264 disengages the hook 31 from the hammer hook 213. Thus, at least the second trigger resistance must be overcome to reach the second trigger stage 73.

[0043] A different situation is based on Fig. 7described, in which the "continuous fire" position of the selector 6 is set. Due to the gate-like design of the section of the control shaft 61 corresponding to the rear section 33, in most cases, the interrupter 3 is pressed downward in this position after the hammer 21 is released. During the previously described firing in "single fire" mode, the interrupter 3 can engage with the hammer 21, while in "continuous fire" the engagement of the hook 31 with the hammer hook 213 is suppressed. To prevent the hammer 21 from scraping against the underside when the slide 11 advances during "continuous fire" mode, the continuous fire group 5 comes into play in a manner known to those skilled in the art. In the "continuous fire" position, the pretension of the continuous fire spring 52 causes the continuous fire element 51 to briefly engage the continuous fire detent 214 of the hammer 21 when the slide 11 returns.When the slide 11 advances, the hammer 21 is held until the locking process is completed and the slide 11 strikes the underside of the continuous fire element 51, whereby the hammer 21 is automatically released again.

[0044] The central objective of the present invention is to provide the ability to move the selector 6 to the "safety" position when the hammer 21 is in the "removed" position and thus the trigger unit 2 is not cocked. This situation is described in Fig. 8 As can be seen from Fig. 8aAs can be seen, the hammer 21 is in the firing position, as can be the case with a fire arrester, i.e., an unfired cartridge. The selector 6 is shown in the "continuous fire position," whereby the situation is analogous to the "single fire position." Due to the inventive design of the trigger unit 2, i.e., due to the separation of the locking element 4 and the trigger lever 26, despite the use of a common trigger lever axis 262 or locking element axis 43, the trigger rear part 263 can be moved downward when the selector 6 is adjusted to the "safety" position, as shown in Fig. 8bAs shown, the locking element 4 can be pre-tensioned from below against the hammer 21 without hindering it during a reloading process and immediately re-engaging with the trigger cam 215. The continuous fire unit 5 can also be returned to its rest position by adjusting the selector 6, unaffected by the position of the struck hammer 21. This would be impossible with a one-piece trigger lever, which would engage directly on the hammer 21 at the front. The situation in Fig. 8b thus shows the selector 6 in the "safety" position, whereby the trigger 264 is deflected at least until the second trigger stage 72 is reached.

[0045] A further embodiment of the invention relates to the design of the trigger edge 44, which has a special shape in the contact area with the trigger cam 215. An enlarged, albeit schematic, representation of the detail E from Fig. 5cshows the trigger edge 44, which preferably has an oblique and / or convex shape on the surface facing the trigger cam 215. A convex curvature of this surface enables the reduction of the contact area between the trigger edge 44 and the trigger cam 215, due to the essentially arcuate movement of the locking element 4 around the trigger axis 262 upon reaching the first trigger stage 71, to lead to a homogeneous increase in the second trigger resistance. The resulting increase in surface pressure thus increases essentially linearly with the remaining contact area, whereas a trigger edge 44 with a rectangular design would result in an inhomogeneous increase in the trigger resistance.

[0046] In certain cases, it may prove advantageous if, as shown, the trigger edge 44 has a convex curvature with a radius r 441, measured from the trigger axis 262 or the locking element axis 43 to the apex of the curvature. This radius 441 is preferably smaller than the normal distance between the apex of the convex curvature and the locking element axis 43. Furthermore, for smaller radii in the direction of rotation around the locking element axis 43, the apex can also be positioned off-center from the trigger edge 44. These relationships can be easily optimized by a person skilled in the art.

[0047] The trigger unit 2 according to the invention is primarily described as a drop-in trigger unit, wherein at least the hammer 21, the hammer spring 211, the interrupter 3, the interrupter spring 34, the locking element 4, the locking element spring 41, and the trigger lever 26 are arranged in a trigger housing 23 according to the previously mentioned embodiments to form a drop-in trigger unit.

[0048] It has proven advantageous if clamping screws 27, such as in Fig. 2a shown, are intended for bracing the drop-in trigger unit. These clamping screws 27 are arranged, penetrating the trigger housing 23 on the underside, and can be actuated from above, thereby significantly reducing the positional tolerance in the lower housing 1 of a firearm.

[0049] The invention is not limited to the illustrated and described embodiment, but can be adapted and modified in various ways. This applies primarily to adaptation to other existing weapons, but also to the dimensions and geometry of the individual parts.

[0050] The materials used are the same as in the prior art, as are the manufacturing processes. List of reference symbols:

[0051] 1 Lower housing 3 Disconnector 11 Bolt carrier 31 hook 12 grip 32 pivot joint 13 magazine well 33 back end 14 Magazine catch 34 Disconnector spring 15 Bolt catch 35 Pivoting axis 2 trigger unit 4 Sear element 21 hammer ("hammer") 41 Sear spring 211 hammer spring 412 Sear spring support 212 hammer axis 42 bearing opening 213 hammer hook 43 Sear axis 214 Auto sear hook 44 Sear edge 441 radius 215 Trigger cam ("hammer cam") 45 Sear protrusion 23 trigger unit housing 451 Adjustable sear protrusion 24 Bearing sleeve ("bushing") 46 Spring recess 241 Bushing safety 461 ramp 25 inner surface 5 Auto sear unit 26 trigger lever 51 Continuous fire element (“auto sear”) 261 Hammer spring support 52 Auto spring 262 trigger axis 6 selector 263 Trigger rear 61 control shaft 264 trigger 71 Rest position 27 socket set screw 72 1st stage 73 2nd stage 91 Running direction (front) 92 Transverse direction (left) 93 Normal direction (top)

Claims

1. A firearm comprising: - a lower housing (1), in which a selector (6) and - a trigger unit (2) are provided, the latter - having a hammer (21) which is rotatably mounted about a hammer axis (212) and can be biased by means of a hammer spring (211), - a trigger lever (26) which is rotatably mounted about a trigger axis (262) and has, preferably formed integrally therewith, a trigger (264), which, seen in a normal direction (93), is located below the trigger axis (262) and, when the trigger unit is actuated, is moved in a direction opposite to a barrel direction (91), the trigger lever (26) having a trigger rear (263) which is designed to receive at least one disconnector (3), - a sear (4) which is mounted rotatably about a sear axis (43) and can be biased by means of a sear spring (41), wherein the hammer axis (212), the trigger axis (262) and the sear axis (43) are arranged parallel to one another and parallel to a transverse direction (92), wherein the selector (6) releases or blocks the upward movement of the trigger rear (263) by means of a rotatable control shaft (61) depending on its angular position, characterised in that the trigger lever (26) has a receiving opening and the sear (4) is at least partially seated within the receiving opening, the sear axis (43) and the trigger axis (262) coincide, the sear (4) has a bearing recess (42) on its upper side for receiving and limited rotation about a disconnector axis (35) of a disconnector pivot (32) formed on the underside of the disconnector (3), and the bearing recess (42) is designed to at least partially enclose the disconnector pivot (32) in the direction of rotation about the disconnector axis (35).

2. Trigger unit (2), preferably a drop-in trigger unit, which has at least one hammer (21), a hammer spring (211), a disconnector (3), a disconnector spring (34), a sear (4), a sear spring (41) and a trigger lever (26), optionally in a trigger housing (23), and which is designed such that it can be inserted into the lower housing (1) of a firearm with a selector (6), wherein: - the hammer (21), which is mounted so as to be rotatable about a hammer axis (212), can be biased by means of a hammer spring (211), - the trigger lever (26), which is mounted so as to be rotatable about a trigger axis (262), has a trigger (264), which is preferably formed integrally therewith, is located below the trigger axis (262), as seen in a normal direction (93), and is moved counter to a barrel direction (91) when the trigger unit is actuated, the trigger lever (26) having a trigger rear (263), which is designed to receive at least the disconnector (3), - the sear (4) is mounted rotatably about a sear axis (43) and can be biased by means of a sear spring (41), the hammer axis (212), the trigger axis (262) and the sear axis (43) being arranged parallel to one another and parallel to a transverse direction (92), - the selector (6) releasing or blocking the upward movement of the trigger rear (263), characterised in that the trigger lever (26) has a receiving opening and the sear (4) is arranged at least partially within the receiving opening, the sear axis (43) and the trigger axis (262) coincide, the sear (4) has, on its upper side, a bearing recess (42) for receiving and limited rotation about a disconnector axis (35) of a disconnector pivot (32) formed on the underside of the disconnector (3) and the bearing recess (42) is designed to at least partially enclose the disconnector (32) in the direction of rotation about the disconnector axis (35).

3. Firearm according to claim 1 or trigger unit (2), preferably drop-in trigger unit, according to claim 2, characterised in that an inner surface (25) of the trigger rear (263) facing the sear (4) is designed to slope downwards towards the rear, preferably as an inclined surface.

4. Firearm according to any of claims 1 or 3 or trigger unit (2), preferably drop-in trigger unit, according to any of claims 2 or 3, characterised in that the sear (4) has a sear edge (44) whose surface facing a trigger cam (215) of the hammer (21) has a convex shape.

5. A firearm or trigger unit (2), preferably a drop-in trigger unit, according to claim 4, characterised in that the convex surface of the sear edge (44) has a radius r (441) to the trigger axis (262) or sear axis (43) in the range of 0.8 < r< 1.2, preferably 0.75< r< 1.1.

6. Firearm according to any of claims 1 or 3 to 5, or trigger unit (2), preferably drop-in trigger unit, according to any of claims 2 to 5, characterised in that a sear spring support (412) for supporting the sear spring (41) is formed on both sides of the sear (4) in the transverse direction (52).

7. Firearm according to any of claims 1 or 3 to 6, or trigger unit (2), preferably drop-in trigger unit, according to any of claims 2 to 6, with a hammer spring (211) with a first and a second arm, characterised in that a hammer spring support (261) for supporting the hammer spring (211) is formed on both sides of the trigger lever (26) in the transverse direction (52).

8. Firearm according to any of claims 1 or 3 to 7, or trigger unit (2), preferably drop-in trigger unit, according to any of claims 2 to 7, characterised in that the disconnector (3) has a recess on the underside for at least partially receiving an disconnector spring (34).

9. Firearm according to any of claims 1 or 3 to 8 or trigger unit (2), preferably drop-in trigger unit, according to any of claims 2 to 8, characterised in that the sear (4) has a spring recess (46) on its side facing the disconnector (3) for at least partially receiving the disconnector spring (34).

10. Firearm or trigger unit (2), preferably a drop-in trigger unit, according to claim 9, characterised in that the spring recess (46) is at least partially open laterally in at least one transverse direction (52).

11. Firearm or trigger unit (2), preferably drop-in trigger unit, according to claim 10, characterised in that the spring recess (46) has an outwardly sloping ramp (461).

12. Firearm according to any of claims 1 or 3 to 11, or trigger unit (2), preferably drop-in trigger unit, according to any of claims 2 to 11, characterised in that an adjustable adjustment device (451), preferably in the form of a grub screw or prismatic adjustment element, is formed on the sear (4) for adjusting that part of the sear protrusion (45) which projects on the underside.

13. Firearm according to any of claims 1 or 3 to 11, or trigger unit (2), preferably drop-in trigger unit, according to any of claims 2 to 11, characterised in that a sear protrusion (45) is formed on the underside of the sear (4).

14. Drop-in trigger unit (2) according to any of claims 2 to 13, characterised in that at least one socket set screw (27) is arranged on the underside, penetrating the trigger housing (23).

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