Trigger assembly configured to be quickly inserted and removed from the lower receiver of a firearm of the type ar

Abstract

A trigger is described which can be quickly removed and installed from the lower housing section of AR-type weapons, wherein the trigger (24) has a trigger housing (27) which has two hollow shafts (36), and wherein a hammer (25) is rotatably mounted on one of the two hollow shafts (36a) and a trigger (26) is rotatably mounted on the other of the two hollow shafts (36b), and wherein each of the two hollow shafts (36) has an opening in which a left-hand bearing pin (31) and a right-hand bearing pin (32) are displaceably guided, which are connected to one another by means of a threaded spindle (39).

Description

[0001] AR-10 and AR-15 handguns are primarily used in military applications. This type of firearm is also very popular as a sporting weapon, and in recent years its acceptance among hunters has increased. Its development in the 1950s is attributed to Eugene Stoner for the Armalite company. The abbreviation AR originally stood for "Armalite Rifle."

[0002] This type of weapon is a self-loading rifle, which in its civilian version is semi-automatic and in its military version is sometimes also used as a fully automatic variant. With a semi-automatic weapon, the trigger must be pulled again for each shot. With the fully automatic variant, however, it can be switched to continuous fire.

[0003] Today, many manufacturers of this type of weapon no longer refer to their weapons as AR-10 or AR-15, but instead market their models under their own names. For the sake of simplicity, the term "AR-type weapons" will be used throughout this text.

[0004] The terms "left", "right", "top", and "bottom" refer to the shooter's line of sight with the weapon shouldered. This line of sight runs along the barrel towards the muzzle.

[0005] Nearly all AR-type handguns share the common feature of a trigger mechanism that is mounted in the receiver via two cylindrical pins. The trigger has a sear that protrudes downwards from the receiver. To fire, the sear must be pulled with the index finger until a notch between the sear and hammer is released. Typically, a pre-tensioned double-legged spring sets the hammer in motion and accelerates it until it strikes the firing pin.

[0006] A distinction is made between triggers with and without their own trigger housing. Triggers with their own trigger housing are also known as "drop-in" triggers. In triggers without a separate trigger housing, the hammer and trigger blade are mounted directly into the gun receiver using cylindrical pins.

[0007] The receivers of this type of weapon also share the feature that the upper and lower receiver sections are connected by two additional pins. When the rear of these two pins is pulled out to its stop, the upper receiver section can be folded down over the front pin, which acts like a hinge, and the trigger is accessed from above. These design features have been retained since the 1950s.

[0008] In AR-type semi-automatic and fully automatic firearms, a portion of the gas that propels the bullet through the barrel during firing is diverted to accelerate the bolt backward, in the opposite direction of fire. During this rearward movement, the bolt pushes the trigger hammer downward, cocking the trigger. A compression spring located in the buttstock then propels the bolt forward again in the direction of fire, feeding a cartridge from the magazine into the chamber. Once the bolt locks, the firearm is ready to fire again.

[0009] AR-type firearms, which use a direct gas system, are particularly prone to rapid and severe fouling of the trigger mechanism. This is due to the gases, which contain combustion and powder residue, and to which the trigger mechanism is directly exposed.

[0010] AR-type rifles are also available that operate with an indirect gas system, a so-called piston system. In this system, the diverted gas acts on a piston, which in turn accelerates the bolt backward in the opposite direction of fire. This results in significantly less contaminated gas entering the system. Nevertheless, the trigger mechanism is contaminated with large amounts of contaminated gas because, after the bolt opens and the empty cartridge case is extracted from the chamber, gas flows back into the system. This effect is further intensified by the use of suppressors, which cause a significantly increased back pressure.

[0011] Combustion and powder residues accumulate on the trigger mechanism's components and can cause the moving parts to become stiff. For this reason, the trigger must be cleaned at regular intervals.

[0012] Cleaning the trigger on AR-type firearms is difficult because the mechanical parts are located deep within the lower receiver. This applies to both standard and drop-in triggers. Lubricating or oiling the moving parts is also challenging due to the limited accessibility.

[0013] Maintenance work is significantly simplified if the trigger can be removed from the lower receiver for this purpose. Depending on the trigger type, disassembly can be difficult, as in most cases the two pins that secure the trigger must be removed. Often, a hammer and a tool such as a cylindrical punch are needed to drive the two pins out of the holes in the lower receiver. In many cases, the safety mechanism must be removed to access the trigger from the lower receiver. To remove the safety, the trigger grip must first be unscrewed from the lower receiver. Only with the trigger grip removed can the compression spring and the detent pin, which axially positions the safety shaft, be accessed. All of these procedures result in the loss of small parts.Special knowledge is required not only during disassembly but also during subsequent assembly, for example to correctly reinstall the trigger parts and their springs into the lower part of the housing and to restore the function in the case of triggers without their own trigger housing.

[0014] The two cylindrical pins that secure the trigger mechanism in the lower receiver of the firearm tend to rotate due to the dynamic forces exerted during firing. This rotation varies in intensity depending on the design, ranging from a few degrees to half a turn per shot. AR-type firearms are always made from relatively soft aluminum alloys. Therefore, the rotation of the pins and the forces of firing can cause the pin holes in the lower receiver to widen over time, resulting in a loss of clearance between the pins and the holes. Consequently, the trigger develops significant play in the lower receiver, negatively impacting accuracy.Manufacturers of weapon housings try to counteract wear by applying thin hard anodized layers, but in the long run even these hard layers often cannot withstand the stresses.

[0015] If an AR-type rifle is fitted with a standard trigger, as used in most military variants and also in the basic configurations of inexpensive sporting rifles, this trigger, for cost reasons, does not have its own housing and is therefore not a drop-in trigger. The hammer and trigger blade are mounted directly to the lower part of the housing by means of two pins. In this case, the pins have two U-shaped notches around their circumference in which spring wires rest. While these spring wires do not prevent the pins from rotating during firing, they reliably prevent lateral movement or even the loss of the pins. The two U-shaped notches have proven to be a disadvantage, as the pins are prone to breakage at these points.

[0016] When more complex drop-in triggers are installed, their trigger housings are usually attached to the lower receiver of the firearm by means of two pins. Since the spring wires that prevent the pins from moving laterally in a standard trigger without its own housing are no longer present, these trigger housings typically feature two vertically arranged threaded studs that are supported by the base of the lower receiver and push the trigger housing upwards, thus securing the two cylindrical pins. It has been observed that the threaded studs tend to loosen due to the dynamic forces during firing. Therefore, manufacturers of such triggers usually recommend securing the threaded studs with a thread-locking compound such as Loctite®. However, even with the studs secured, the two cylindrical pins often begin to move axially within the lower receiver of the firearm.If such a trigger is to be removed again, the adhesive bond of the threaded studs must first be destroyed.

[0017] There is therefore a need for a trigger for AR-type firearms that can be quickly and easily removed from and reinstalled in the lower receiver for cleaning and maintenance. Ideally, the trigger should not require the removal or installation of any other firearm components, such as the safety, trigger grip, or the two cylindrical pins that secure the trigger to the lower receiver. The work should be able to be carried out without requiring specialized knowledge and without any parts being lost.

[0018] Furthermore, there is a need for a trigger where the mounting pins in the lower housing cannot twist or shift. Additionally, the trigger must not require mounting pins with weakening U-shaped grooves to prevent lateral movement. Finally, it must not require the trigger to be secured with threaded studs and additional adhesive. The trigger must be mounted so securely in the lower housing that the shooter experiences no "spongy" feel when pulling the trigger, which would negatively impact shooting accuracy.

[0019] Triggers are known in the prior art that can be removed from and installed in the weapon housing more quickly and easily than standard triggers. Triggers are also known in which the mounting pins in the lower housing do not have the aforementioned disadvantages, or which do not require fixing with threaded studs and locking adhesive.

[0020] US patents 2019 / 0368834 A1 and 2021 / 0102770 A1 describe triggers with retractable safety pins suitable for AR-type firearms. Each trigger housing contains two hollow shafts, each with two sliding safety pins. Each safety pin has an actuator, preferably a hex socket, for operation. Furthermore, each safety pin is secured against falling out of the hollow shaft by an additional pin guided in an L-shaped groove within the shaft. A compression spring is installed between the left and right safety pins, pushing them outwards. These triggers no longer have pins that can rotate or shift within the bores in the lower receiver of the firearm.However, the force of the springs that push the locking pins outwards is far too weak to press them firmly enough against the walls of the receiver and secure them in the bores. When the trigger is pulled, relative movement occurs between the hollow shafts, the locking pins, and the bores, resulting in a spongy feel when pulling the trigger. The dynamic forces generated by firing the shot cause even greater relative movement, eventually leading to an enlargement of the bores in the lower receiver of the weapon. When removing or installing the trigger, either all four locking pins must be removed sequentially with an Allen wrench, or the left and right locking pins of one shaft must be removed simultaneously with two Allen wrenches. The instructions do not specify whether the safety mechanism must be disassembled to remove or install the trigger.

[0021] US patent 2018 / 0100712 A1 discloses a trigger that can be installed and removed without tools. However, this trigger is not designed for AR-type firearms and their standard receivers, as it cannot be installed there due to the geometry of the trigger housing. The applicant explicitly emphasizes this point. A specially designed locking shaft is required for this trigger, which has an axially extending groove and allows disassembly in the "release" position.

[0022] US patent 2021 / 0222981 A1 shows a trigger mechanism that is installed in the receiver using externally threaded pins. The receiver has corresponding internal threads into which the pins are screwed. This trigger mechanism is not designed for AR-type firearms, as the holes in the lower receiver of these rifles are through holes and do not have internal threads into which externally threaded pins could be screwed.

[0023] US patent 2015 / 0121735 A1 proposes a method for fixing a trigger in a receiver base, in which externally threaded pins are screwed into the receiver base. This trigger is not designed for AR-type firearms, as the holes in the receiver base of these are through holes and do not have internal threads into which externally threaded pins could be screwed. The walls of the receiver base shown in the application have been significantly reinforced compared to standard receiver bases to accommodate the corresponding internal threads.

[0024] US Patent 2016 / 0341507 A1 discloses a method to prevent the twisting and movement of the pins used to install a trigger mechanism in the receivers of AR-type firearms. To allow the use of standard trigger components such as the hammer and trigger blade, the special pins used have the same U-shaped grooves for the spring wires as standard pins, making them prone to breakage. The patent proposes preventing the pins from moving and twisting by clipping locking plates over their ends. However, this method results in several parts being lost during trigger removal and installation.

[0025] US Patent 2022 / 0136792 A1 proposes a method for securing the pins in the lower receiver of AR-type firearms. The special pins used have an internal thread. Each pin is secured to the lower receiver with two screws from both sides. This method ensures that the pins cannot rotate or shift. They also lack any weakening grooves on their circumference. However, several parts are lost during trigger removal and installation.

[0026] US Patent 2011 / 0167696 A1 discloses a method for securing the trigger housing in the lower receiver of AR-type firearms. Two vertically arranged threaded studs, accessible from above when the upper receiver is folded down, press the trigger housing away from the bottom of the pocket in the lower receiver. This pressing action simultaneously secures the pins that mount the trigger in the lower receiver against rotation and movement. In practice, such threaded studs tend to loosen after only a short time. Many manufacturers therefore recommend securing the threaded studs with a thread-locking adhesive. If the trigger needs to be removed for maintenance, the adhesive must be broken and then reapplied after reinstallation. Various parts are lost during trigger removal and installation.

[0027] The object of the invention is to create a trigger that can be quickly removed from and installed in the lower receiver of AR-type firearms, without requiring the disassembly of other parts of the firearm during installation, such as the safety, the trigger grip, and the two cylindrical pins by which the trigger is mounted in the lower receiver. The work should be able to be carried out without requiring special knowledge and without generating any loose parts.

[0028] A further objective of the invention is to create a trigger mechanism in which the pins for mounting in the lower housing part cannot twist or migrate. Furthermore, its pins should not have to exhibit a weakening geometry in the form of U-shaped indentations.

[0029] Another object of the invention is to provide a trigger that can be stably fixed in the lower part of the housing and that does not have to be fixed by means of threaded pins, which in turn have to be secured with locking adhesive.

[0030] The problem is solved by a deduction having the features of claim 1. Advantageous embodiments and further developments of the invention are specified in the dependent claims.

[0031] A trigger according to the invention, which can be quickly installed and removed from the lower part of the housing of AR-type weapons, can be installed and removed in approximately ¼ of the time required for a standard trigger.

[0032] A trigger according to the invention has a trigger housing which has two hollow shafts, wherein a hammer is rotatably mounted on one of the two hollow shafts and a trigger blade is rotatably mounted on the other of the two hollow shafts, and wherein each of the two hollow shafts has an opening in which a left and a right bearing journal are slidably guided and are connected to each other by means of a threaded spindle.

[0033] In a particularly preferred embodiment of the invention, the hollow shafts in the extraction housing are secured against twisting by means of a positive locking mechanism and against falling out by means of a spring wire.

[0034] In a particularly preferred embodiment of the invention, the threaded spindles have a section with a right-hand thread and a section with a left-hand thread and are equipped on at least one side with a drive for an operating tool, preferably a Torx® drive.

[0035] In a further, particularly preferred embodiment of the invention, the bearing journals in the hollow shafts are secured against rotation by means of a positive locking mechanism. When the trigger is mounted in the lower part of the weapon's housing, the bearing journals, with their cylindrical section, are guided in the bores in the lower part of the weapon's housing and bear against the inner walls of the pocket with their contact surfaces.

[0036] In a further, particularly preferred embodiment of the invention, the bearing journals can be retracted so far into the hollow shafts that neither the bearing journals nor the threaded spindles protrude beyond the hollow shafts. In this state, the trigger can be removed from or inserted into the lower housing part.

[0037] The invention is explained below using the figures as an example.

[0038] They show: Fig. 1 An AR-type weapon with a built-in standard trigger, according to the prior art, in perspective view; Fig. 2 The AR-type weapon with the upper receiver folded down, without a built-in trigger, in perspective view; Fig. 3 A standard trigger pin, according to the prior art, in perspective view; Fig. 4 The AR-type weapon with the upper receiver folded down, with a built-in standard trigger, hammer in the dropped position, according to the prior art, in perspective view; Fig. 5 The AR-type weapon with the upper receiver folded down, with a built-in standard trigger, hammer in the dropped position, an auxiliary tool, according to the prior art, in a top view; Fig. 6 The AR-type weapon with the upper receiver folded down, with a built-in standard trigger, hammer in the dropped position, according to the prior art, in half-section, in a left view.7. A trigger in the assembled state, hammer in the struck position, with the pivot pin extended, in perspective view; 8. The trigger in exploded view, hammer in the struck position, with the pivot pin retracted, in perspective view; 9. A sub-assembly of a trigger shaft, with the pivot pin extended, in perspective view; 10. The sub-assembly of a trigger shaft, with the pivot pin extended, in half-section; 11. The sub-assembly of a trigger shaft, with the pivot pin retracted, in half-section; 12. The sub-assembly of a trigger shaft, with the pivot pin extended to the stop, in half-section; 13. The sub-assembly of a trigger shaft, in exploded view; 14. A safety, in perspective view.Fig. 15: AR-type weapon with the upper receiver folded down, with integrated trigger, hammer in the cocked position, safety lever in the "SAFE" position, in half-section, from the left. Fig. 16: AR-type weapon with the upper receiver folded down, with integrated trigger, hammer in the fired position, safety lever in the "SEMI" position, in half-section, from the left. Fig. 17: AR-type weapon with the upper receiver folded down, hammer in the cocked position, trigger in the first part of its insertion into the lower receiver, safety lever in the "SEMI" position, in half-section, from the left. Fig. 18: AR-type weapon with the upper receiver folded down, hammer in the cocked position, trigger in the second part of its insertion into the lower receiver, safety lever in the "SEMI" position, in half-section, from the left.

[0039] Subsequently, elements that are identical in design but are installed multiple times and in different locations are distinguished from one another using a letter index. For example, in the reference numeral list, the standard trigger pin is designated with reference numeral 14, and in the explanatory text, a distinction is made between the front standard trigger pin 14a and the rear standard trigger pin 14b, as these are installed in different locations.

[0040] Fig. 1 Figure 3 shows an AR-3 type weapon. The upper receiver 2 and the lower receiver 5 are connected by means of the rear receiver pin 1 and the front receiver pin 4. A standard trigger 6 is located in the lower receiver 5 (see also). Figures 5 and 6 ) installed, of which the standard tongue 7 protrudes downwards from the lower part of the housing 5.

[0041] In Fig. 2The drawing shows an AR-3 type weapon without a built-in trigger. The rear receiver pin 1 is fully extended, and the upper receiver 2 is folded away from the lower receiver 5 as far as possible over the front receiver pin 4. Also visible is the pocket 8 with its base 9, left wall 10, and right wall 11, as well as the front transverse hole 12 and the rear transverse hole 13, which completely penetrate both walls 10 and 11.

[0042] Fig. 3Figure 14 shows a standard trigger pin 14. Standard triggers can be installed in the lower housing part 5 using two of these pins 14a and 14b. The two U-shaped recesses 15 and 16 are visible; spring wires rest in these recesses when the pin is installed to prevent it from moving axially. Recess 15 is positioned in the center of the pin, and recess 16 is positioned more laterally, so that when installed it is located just next to the inner surface 17 of the left wall 10 or the inner surface 18 of the right wall 11 of the pocket 8 (see also...). Fig. 5 ) is located.

[0043] The Figures 4 , 5 and 6Figure 1 shows a standard trigger 6, installed in an AR-3 type firearm. The standard hammer 19 is in the cocked position and protrudes almost vertically upwards from the lower receiver 5. The standard trigger 6 is secured in the lower receiver 5 by means of the two standard trigger pins 14a and 14b. The front standard trigger pin 14a is inserted into the front transverse bore 12, and the standard hammer 19 is rotatably mounted on it. The rear standard trigger pin 14b is inserted into the rear transverse bore 13, and the standard trigger blade 7 is rotatably mounted on it. One of the two legs 58 or 59 of the standard hammer spring 20 rests in the groove 16 (see Figure 1). Fig. 3 ) on the rear standard trigger pin 14b and is intended to prevent axial movement of the pin. The spring wire 22 is located in a stepped bore 21 in the standard hammer 19, which is in the groove 15 (see Fig. 3) rests against the front standard trigger pin 14a and is intended to prevent the pin from moving axially. It becomes apparent that neither the front standard trigger pin 14a nor the rear standard trigger pin 14b need to be mounted in a directionally fixed manner, since the centrally located groove 15 on the front pin 14a and the more laterally located groove 16 on the rear pin 14b are used to position the pins axially. One of the two legs 58 or 59 of the standard hammer spring 20 always rests in the groove 16, regardless of whether the rear pin 14b is mounted such that the groove 16 is closer to the inner surface 17 of the left wall 10 or closer to the inner surface 18 of the right wall 11.

[0044] In the Fig. 5 A helper tool in the form of a driver 23 is shown. Using such a driver 23 and with the help of a device not included in the Fig. 5In the hammer shown, the standard trigger pins 14a and 14b are driven into the transverse bores 12 and 13 and driven out again during disassembly. It is irrelevant from which side of the lower housing part 5 and in which orientation the pins are mounted.

[0045] Fig. 7 Figure 1 shows a trigger 24 according to the invention in its assembled state. It is designed as a drop-in trigger and therefore has its own trigger housing 27. The hammer 25 is in the cocked position. The trigger blade 26 of the trigger 24 protrudes downwards from the trigger housing 27. The hammer spring 28, the switching shaft 29, and the breaker 30 are also visible. The function of the switching shaft 29 and the breaker 30 is not explained in detail here, as this is irrelevant for the following descriptions. The two left bearing journals 31a and 31b, as well as the two right bearing journals 32a and 32b, are connected by means of a Figure 9 ,10 , 11 , 12 and 13 The threaded drive, as explained in more detail below, extends laterally from the subassemblies of the trigger shafts 33a and 33b. The bearing journals 31a, 31b and 32a, 32b are shown in the position fixed in the lower housing part 5, in which the contact shoulders 37 and 38 bear against the inner surfaces 17 and 18 of the walls 10 and 11. In the Fig. 7 The two right bearing pins 32a and 32b with their mounting shoulders 38 are not visible, as they are covered by the trigger housing 27.

[0046] In Fig. 8The individual parts of the trigger 24 are visible. The two sub-assemblies of the trigger shaft 33a and 33b are installed in the trigger housing 27. The hammer 25 is rotatably mounted on the front sub-assembly of the trigger shaft 33a, and the trigger blade 26 is mounted on the rear sub-assembly of the trigger shaft 33b. The hammer 25 has the detent surface 34, and the trigger blade 26 has the detent surface 35. The two left bearing pins 31a and 31b, as well as the two right bearing pins 32a and 32b, are recessed into the sub-assemblies of the trigger shafts 33 and therefore do not protrude laterally beyond the trigger housing 27. In this position of the bearing pins 31a, 31b and 32a, 32b, the trigger 24 can be removed from and reinserted into the lower housing part 5. The hammer spring 28 is designed as a double-legged spring, which is supported with its legs on the hammer 25 and in the trigger housing 27 and whose coils are guided on the two laterally projecting extensions on the hammer 25.

[0047] The Fig. 9 shows a sub-assembly of a trigger shaft 33. The left bearing journal 31 and the right bearing journal 32 are connected by means of the threaded spindle 39 (see Fig. 10 , 11 , 12 and 13 ) from the hollow shaft 36 extended as far as in the installed state in the lower housing part 5, in which the left bearing journal 31 with its contact shoulder 37 is pressed against the inner surface 17 of the left wall 10 and the right bearing journal 32 with its contact shoulder 38 is pressed against the inner wall 18 of the right wall 11.

[0048] The hollow shaft 36 has a cylindrical outer contour over most of its length. In a particularly preferred embodiment, it is provided at its left end with a shoulder 61, the outer shape of which is diamond-shaped. The four corners of the diamond shape are rounded with radii for easier manufacturing and to minimize the notch effect. The shoulder 61, by means of its diamond shape, forms an anti-rotation device against the trigger housing 27 (see also Fig. 7 and 8), one wall of which is provided with two bores for the cylindrical part of the outer contour of the hollow shafts 36, and the opposite wall of which is provided with two diamond-shaped openings for the end of the hollow shafts 36, which have the shoulder 61. In other embodiments of the invention, the anti-rotation device for the hollow shafts 36 relative to the trigger housing 27 can also be formed by any other type of positive locking. In further embodiments of the invention, the right end of the hollow shaft 36 has the shoulder 61. Accordingly, the two bores in the left wall and the two diamond-shaped openings in the right wall of the trigger housing 27 are positioned. The assembly of the trigger shaft sub-assembly 33 in the trigger housing 27 must then be carried out from the left side.The shoulder is provided with at least one V-shaped groove 60 into which the locking wire 44 engages and secures the sub-assembly of the trigger shaft 33 in the trigger housing 27 in an axial direction (see also . Fig. 8 Other groove designs are also conceivable, such as a U-shaped or rectangular groove. The threaded pin 45 prevents the safety wire 44 from falling out of the trigger housing 27 (see Fig. 8 ).

[0049] The Fig. 10Figure 1 also shows a subassembly of a trigger shaft 33, whose bearing journals 31 and 32 are extended to the same extent as when installed in the lower housing part 5. The threaded spindle 39 is equipped at one end with a drive for an operating tool. In this particularly preferred embodiment of the invention, the drive is designed as a Torx® drive 43. When installed, this drive is located on the right side of the weapon, so that clockwise operation extends the bearing journals 31 and 32, and counterclockwise operation retracts them. This function is achieved by designing the threaded section on the side of the threaded spindle 39 located on the drive side as a right-hand thread section 41 and the opposite threaded section as a left-hand thread section 40. A relief groove 42 is arranged between the two threaded sections.

[0050] The left bearing journal 31 has an internal thread 46, which is designed as a left-hand thread. The right bearing journal 32 has an internal thread 47, which is designed as a right-hand thread. Both bearing journals have a diamond-shaped outer contour over most of their length, which serves as an anti-rotation feature in the diamond-shaped opening 62 of the hollow shafts 36 and is designed analogously to the anti-rotation feature of the hollow shafts 36 relative to the trigger housing 27 (see also Figure 9 and 13 The anti-rotation device for the bearing journals 31 and 32 relative to the hollow shafts 36 need not be diamond-shaped, but can be formed by any other type of positive locking mechanism. The locking pin 48 is inserted into a bore 49 in the hollow shaft 36, which extends transversely to the axis D (see also Figure 9 and 13 ).

[0051] In the Fig. 11The state of the trigger shaft subassembly 33 is shown, in which the bearing journals 31 and 32 are retracted into the hollow shaft 36 until they reach the stop against the locking pin 48. In this state, the trigger 24 can be removed from and reinserted into the lower housing 5 for removal and installation, since the length of the hollow shafts 36 corresponds approximately to the width of the trigger housing 27 and the two ends of the hollow shafts 36 are approximately flush with the left and right outer walls of the trigger housing 27 when assembled (see also Fig. 8 ).

[0052] To prevent the user from turning the threaded spindle 39 so far counterclockwise when the trigger 24 is removed from the lower housing 5 that the bearing journals 31 and 32 detach from the threaded spindle 39 and fall out of the hollow shaft 36, the threaded spindle 39 is secured at its end opposite the Torx® drive 43 with a Fig. 12The visible countersink 50 is provided. During the factory assembly of the trigger 24, the countersink 50 is compressed with a special tool so that the first thread is deformed and the left bearing journal 31 cannot be unscrewed from the threaded spindle 39 without considerable force. Due to the guidance of the two bearing journals 31 and 32 in the hollow shaft 36 and their synchronized, opposing axial movement when the threaded spindle 39 is rotated, this measure also prevents the right bearing journal 32 from being unscrewed from the threaded spindle 39 without considerable force.

[0053] The one in Fig. 12The illustrated subassembly of the trigger shaft 33 shows the condition in which the deformed first thread of the threaded spindle 39 blocks the internal thread 46 of the left bearing journal 31, as it acts as a stop against the left bearing journal 31. This condition can only be reached when the assembly is removed from the lower housing part 5, because in the installed state, the contact shoulders 37 and 38 of the bearing journals 31 and 32 already come into contact with the inner surfaces 17 and 18 of the walls 10 and 11.

[0054] Borehole 49 (see Fig. 9 And 13) for the locking pin 48 is positioned in the hollow shaft 36 such that in the Fig. 12 In the depicted state, neither of the two bearing journals 31 or 32 can fall out of the hollow shaft 36, since the other bearing journal is blocked beforehand by the locking pin 48.

[0055] In Fig. 13The individual parts of the sub-assembly of the trigger shaft 33 are shown again. The bore 49 in the hollow shaft 36 is positioned so that the locking pin 48 cannot fall out, as the bore is covered by the hammer 25 or the trigger blade 26 (see also Fig. 7 and 8 Therefore, the locking pin 48 does not need to be secured in the axial direction by, for example, gluing, crimping, pressing or shrinking (see also Figure 15 and 16 ).

[0056] In the Figure 1 , 2 , 4 and 5 An example of an AR 3 type weapon was shown, in which the safety lever 52 of the safety 51 has three possible positions engraved on the lower part of the receiver 5: SAFE (Safe) SEMI (Semi-automatic fire) AUTO (Fully automatic fire)

[0057] The one in Fig. 14The safety 51 shown in this exemplary embodiment is a one-piece cast component consisting of the safety lever 52 and the safety shaft 53. Multi-part safeties are also available on the market, in which the safety lever is attached to the safety shaft by, for example, screws or pins. Ambidextrous safeties, which have a safety lever at both ends of the safety shaft, are also known. Visible are the circumferential surface 54, which blocks the trigger 26 in the "SAFE" position, and the flattened area 55, which allows trigger movement of the trigger 26 in the "SEMI" position. The "AUTO" position is not explained in detail here, as it is irrelevant for the following descriptions.

[0058] In the Figure 15 and 16 The interaction between the safety shaft 53 and the trigger 26 is explained in more detail.

[0059] In the Fig. 15The hammer 25 is in the cocked state and the safety lever 52 (as shown in the sectional view in the Fig. 15 (not visible) in the "SAFE" position. The hammer 25 rests with its detent surface 34 against the detent surface 35 on the trigger blade 26. The safety shaft 53 blocks the trigger blade 26 with its circumferential surface 54. The rear end of the trigger blade projects only as far as absolutely necessary beyond the vertical axis V, which runs through the pivot point of the safety shaft 53. The insertion ramp 56 is visible. A gap is also visible between the underside of the trigger housing 27 and the base surface 9. The trigger 24 is therefore not mounted in the lower housing part 5, but is held exclusively by the subassemblies of the trigger shafts 33.

[0060] In the Fig. 16The hammer 25 is in the depressed position, the safety lever 52 is in the "SEMI" position, and the safety shaft 53, by means of its flattened section 55, allows the trigger 26 to move. When the trigger 26 is actuated, the detent surfaces 34 and 35 are released, and the hammer spring 28 accelerates the hammer 25 until it strikes the firing pin (not shown), which is located in the upper part 2 of the housing.

[0061] Fig. 17 shows that when installing the trigger 24, it must be held diagonally forwards and upwards so that the trigger 26 can move past the safety shaft 53 and simultaneously be threaded through the opening 57 in the lower part of the housing 5.

[0062] Out of Fig. 18It becomes apparent that the insertion ramp 56, in conjunction with the shortest possible rear end of the trigger 26, allows the trigger 26 to be inserted with its rear end between the safety shaft 53 and the base surface 9. The trigger 24 is easiest to insert in the "SEMI" position of the safety lever 52, in which the flattened section 55 of the safety shaft 53 is in a horizontal position.

[0063] From the Figure 17 and 18 It becomes apparent that the safety 51 and the handle for the trigger hand do not need to be disassembled for the removal or installation of a trigger 24 according to the invention.

[0064] The following describes the removal and installation of a trigger 24 according to the invention into the lower housing part 5 of a weapon of type AR 3.

[0065] Expansion of the extraction system: 1. Pull out the rear housing pin 1 as far as it will go and fold the upper housing part 2 away from the lower housing part 5. 2. If the hammer 25 is in the released position, move it to the cocked position. 3. Using a suitable Torx® wrench, turn the bearing journals 31 and 32 of both trigger shaft subassemblies 33 counterclockwise into the hollow shafts 36 until they rest against the locking pins 48. 4. Remove the trigger 24 from the lower housing part 5.

[0066] Installation of the extractor hood: 1. If the hammer 25 is in the broken position after maintenance or cleaning, it must be cocked. 2. Hold the trigger 24 diagonally upwards and forwards, and when inserting it into the lower housing 5, first thread the trigger blade 26 through the opening 57 and then simultaneously guide its rear end past the safety shaft 53. 3. Guide the rear end of the trigger blade 26 backwards between the flat 55 on the safety shaft 52 and the base 9 until the trigger housing 27 can be placed on the base 9. 4. Using a suitable Torx® key, extend the bearing journals 31 and 32 of both subassemblies of the trigger shafts 33 from the hollow shafts 36 by turning them clockwise until they are centered in the transverse bores 12 and 13 and their contact shoulders 37 and 38 rest against the inner surfaces 17 and 18 of the walls 10 and 11.A gap forms between the underside of the trigger housing 27 and the base surface 9. 5. Tighten both threaded drives securely. 6. Fold the upper housing part 2 back onto the lower housing part 5 and push the rear housing pin 1 in until it stops.

[0067] In another embodiment of the invention, not shown, the threaded spindle 39 is equipped with a drive at both ends. In this embodiment, operation can be carried out from either side of the weapon.

[0068] To deform the last thread and thus create a stop for the left bearing journal 31, the threaded spindle 39 does not necessarily need to be equipped with a countersink 50. This can also be achieved if the affected end is equipped with a drive, such as an internal hexagon or Torx® drive.

[0069] In another embodiment of the invention, not shown, the threaded spindle 39 is equipped with a drive at its left end. Operation must then be carried out from the left side of the weapon.

[0070] It is also possible to design the spindle 39 with the right-hand thread section being a left-hand thread and the left-hand thread section being a right-hand thread. The internal threads of the bearing journals must then be designed accordingly.

[0071] In further embodiments of the invention not shown, the drive of the threaded spindle 39 can also be designed as a slot, cross slot, internal hexagon or any other desired drive type.

[0072] In a further embodiment of the invention, not shown, the threaded connection between the threaded spindle 39 and at least one of the bearing journals 31 or 32 is equipped with a thread locking device. This thread locking device can, for example, be designed as a threaded wire insert, as a chemical thread locking device in the form of a spot coating, or in any other conceivable manner.

[0073] In a further embodiment of the invention, not shown, the rear end of the trigger blade 26 does not have an insertion ramp 56, but has any other contour which makes it possible, with the safety 51 installed, when inserting the trigger 24 into the pocket 8 in the lower part of the housing 5, to guide the trigger blade 26 through the opening 57 and to insert the rear end of the trigger blade 26 between the safety shaft 53 and the base surface 9. Reference symbol list

[0074] 1 Rear receiver pin 2 Upper receiver 3 AR-type weapon 4 Front receiver pin 5 Lower receiver 6 Standard trigger 7 Standard trigger blade 6 8 Pocket 9 Bottom surface 10 Left wall 11 Right wall 12 Front cross hole 13 Rear cross hole 14 Standard trigger pin 15 Center-positioned groove 16 Side-positioned groove 17 Left wall inner surface 10 18 Right wall inner surface 11 19 Standard hammer 20 Standard hammer spring 21 Stepped hole for spring wire in standard hammer 19 22 Spring wire in standard hammer 19 23 Driver 24 Trigger 25 Hammer 26 Blade 27 Trigger housing 28 Hammer spring 29 Switch shaft 30 Disconnector 31 Left bearing pin 32 Right bearing journal 33 Trigger shaft subassembly 34 Detent surface on hammer 25 35 Detent surface on trigger blade 26 36 Hollow shaft 37 Mounting shoulder on left bearing journal 31 38 Mounting shoulder on right bearing journal 32 39 Threaded spindle 40 Left-hand thread section 41 Right-hand thread section 42 Undercut 43 Torx® drive 44 Locking wire 45 Set screw 46 Internal thread47 Internal thread 48 Right-hand thread 49 Bore for locking pin 50 Countersink 51 Lock 52 Locking lever 53 Locking shaft 54 ​​Circumferential surface 55 Flattened surface 56 Lead-in chamfer 57 Opening in lower housing 58 First leg of standard hammer spring 59 Second leg of standard hammer spring 60 Groove 61 Shoulder 62 Opening in hollow shaft 36

Claims

1. Removable and installable trigger for weapons of the type AR, wherein the trigger (24) has a trigger housing (27), which has two hollow shafts (36), and wherein a hammer (25) is rotatably mounted on one of the two hollow shafts (36a) and a trigger blade (26) is rotatably mounted on the other of the two hollow shafts (36b), and wherein each of the two hollow shafts (36) has a breakthrough, slidably guided in which there is respectively a left bearing journal (31) and a right bearing journal (32), characterized in that the left bearing journal and the right bearing journal are connected to each other by means of a threaded spindle (39).

2. Trigger according to Claim 1, characterized in that both hollow shafts (36) are prevented from twisting in the trigger housing (27) in that they have a form fit in relation to the trigger housing (27) in the direction of rotation.

3. Trigger according to Claim 2, characterized in that both hollow shafts (36) are prevented from twisting in the trigger housing (27) in that they have at their one end a shoulder (61) which is formed in a diamond shape, which can be axially inserted into two likewise diamond-shaped breakthroughs in a wall of the trigger housing (27) but cannot be twisted.

4. Trigger according to Claim 1, characterized in that both hollow shafts (36) are prevented from falling out of the trigger housing (27) in that they have at least one groove (60) in which a safety wire (44) runs in the state in which it is fitted in the trigger housing (27).

5. Trigger according to Claim 4, characterized in that the safety wires (44) are prevented from falling out of the trigger housing (27) by means of threaded pins (45).

6. Trigger according to Claim 1, characterized in that the threaded spindles (39) have a section with a right-hand thread (41) and a section with a left-hand thread (40).

7. Trigger according to Claim 1, characterized in that the threaded spindles (39) have at least one drive for an operating tool.

8. Trigger according to Claim 7, characterized in that the drive of the threaded spindles (39) is designed as a Torx® drive (43).

9. Trigger according to Claim 1, characterized in that the right bearing journals (32) and the left bearing journals (31) are prevented from twisting in the hollow shafts (36) in that they have a form fit in relation to the hollow shafts (36) in the direction of rotation.

10. Trigger according to Claim 9, characterized in that the right bearing journals (32) and the left bearing journals (31) have a diamond-shaped outer shape, which can be axially inserted in the likewise diamond-shaped breakthrough (62) in the hollow shafts (36) but cannot be twisted.

11. Trigger according to Claim 1, characterized in that, in the state in which the trigger (24) is mounted in the lower receiver part (5), the left bearing journals (31) are guided with their cylindrical section in the holes (12) and (13) in the left wall (10) and support themselves with their bearing shoulders (37) on the inner surface (17), and in that the right bearing journals (32) are guided with their cylindrical section in the holes (12) and (13) in the right wall (11) and support themselves with their bearing shoulders (38) on the inner surface (18), wherein the force for supporting is applied by turning the threaded spindles (39) by means of an operating tool.

12. Trigger according to Claim 1, characterized in that the bearing journals (31) and (32) are retractable into the hollow shafts (36) so far that they do not protrude beyond the hollow shafts (36).

13. Trigger according to Claim 1, characterized in that the hollow shafts (36) have a hole (49) running transversely to the axis D for a locking pin (48).

14. Trigger according to Claim 13, characterized in that, when the right bearing journal (32) and the left bearing journal (31) bear with their bottom surfaces against the locking pin (48) at the same time, both the right bearing journal (32) and the left bearing journal (31) and also the threaded spindle (39) do not protrude beyond the hollow shaft (36).

15. Trigger according to Claim 1, characterized in that it can be inserted into the pocket (8) in the lower receiver part (5) when the bearing journals (31 and 32) are fully retracted.

16. Trigger according to Claim 15, characterized in that the rear end of the trigger blade (26) has a contour which, when the safety (51) has been installed, allows the trigger blade (26) to be guided through the breakthrough (57) and the rear end of the trigger blade (26) to be inserted between the safety shaft (53) and the bottom surface (9) when inserting the trigger (24) into the pocket (8) in the lower receiver part (5).

17. Trigger according to Claim 16, characterized in that the trigger blade (26) has an insertion slope (56).

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