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 the military. This type of weapon also enjoys great popularity as a sporting weapon, and in recent years, it has seen increasing acceptance among hunters. Its development in the 1950s was attributed to Eugen Stoner for the company Armalite. 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 fully automatic. With a semi-automatic weapon, the trigger must be pulled again for each shot. With the fully automatic version, 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 designations. For simplicity, the term "AR-type weapons" will be used in this article.

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

[0005] Almost all AR-type handguns have in common that they are equipped with a trigger, which is mounted in the receiver by means of two cylindrical pins. The trigger is actuated by a blade that protrudes downward from the receiver. To fire a shot, the trigger must be pulled with the index finger until a detent between the blade and the hammer is released. Typically, a preloaded double-leg spring causes the hammer to rotate, accelerating it until it strikes the firing pin.

[0006] A distinction is made between triggers with and without a trigger housing. Triggers with a trigger housing are also called "drop-in" triggers. In triggers without a trigger housing, the hammer and trigger blade are mounted directly into the weapon housing via cylindrical pins.

[0007] Another common feature of this type of receiver is that the upper and lower receivers are connected by two additional pins. If the rear of these two pins is pulled out as far as it will go, the upper receiver can be folded down using the front pin, which acts like a hinge, and the trigger is accessible from above. These design features have been retained since the 1950s.

[0008] In semi-automatic and fully automatic AR-type weapons, a portion of the gas that propels the bullet through the barrel during firing is diverted to accelerate the weapon's bolt backward, opposite to the direction of fire. During this backward movement, the bolt pushes the trigger hammer down, cocking the trigger. A compression spring built into the buttstock then propels the bolt forward again in the direction of fire. This feeds a cartridge from the magazine into the chamber. Once the bolt has locked, the weapon is ready to fire again.

[0009] In AR-type weapons with a direct gas system, the trigger becomes particularly quickly and heavily contaminated. This is due to the gases containing combustion and gunpowder residues to which the trigger mechanism is directly exposed.

[0010] AR-type weapons are also available that operate with an indirect gas system, a so-called piston system. With this system, the diverted gas acts on a piston, which in turn accelerates the bolt backward, opposite to the firing direction. This results in significantly less contaminated gas entering the system. Nevertheless, the trigger mechanism is contaminated with large quantities of contaminated gas, as gas flows back into the system after the bolt is opened and the empty cartridge case is extracted from the chamber. This effect is further amplified by the use of silencers, which cause significantly increased gas backpressure.

[0011] Combustion and powder residues build up on the trigger components and can cause the moving parts to become stiff. Therefore, the trigger must be cleaned at regular intervals.

[0012] Cleaning the trigger on AR-type weapons is difficult because the mechanical components are embedded deep within the lower receiver. This applies to both standard and drop-in triggers. Lubricating or oiling the moving parts is equally difficult due to the limited access.

[0013] Maintenance work is made considerably easier if the trigger can be removed from the lower receiver for this purpose. Depending on the type of trigger installed, disassembly can be difficult because in most cases the two pins that hold the trigger in place have to be removed. A hammer and a tool in the form of a cylindrical driver are often required to drive the two pins out of the holes in the lower receiver. In many cases, the safety must be removed before the trigger can be removed from the lower receiver. To remove this, the trigger hand grip must first be unscrewed from the lower receiver. The compression spring and the detent pin, which axially positions the safety shaft, can only be removed when the trigger hand grip is removed. All of this work results in loose parts.Special knowledge is required not only during disassembly but also during subsequent assembly, for example in the case of triggers without their own trigger housing, in order to be able to correctly reinstall the trigger parts and their springs into the lower part of the housing and to restore the function.

[0014] The two cylindrical pins that hold the trigger in the lower receiver of the weapon tend to rotate due to the dynamic forces that act upon firing. This rotational movement varies in intensity depending on the design and can range from a few degrees to half a turn per shot. The lower receivers of AR-type weapons are always made of relatively soft aluminum alloys. Therefore, the rotational movement of the pins and the forces that occur during firing can cause the pin holes in the lower receiver to expand over time, and the fit between the pins and the holes to no longer be secure. As a result, the trigger develops significant play in the lower receiver, which impairs firing precision.The manufacturers of gun cases try to counteract wear by applying thin hard anodizing layers, but in the long run even these hard layers often do not withstand the stresses.

[0015] If an AR-type weapon is fitted with a standard trigger, as is the case in most military variants and also in the basic configurations of inexpensive sporting weapons, this trigger does not have its own housing for cost reasons and is therefore not designed as a drop-in trigger. The hammer and trigger blade are installed directly in the lower housing using two pins. In this case, the pins have two U-shaped recesses around their circumference in which spring wires are inserted. Although these spring wires do not prevent the pins from rotating when the shot is fired, they reliably prevent them from moving sideways or even becoming lost. The two U-shaped recesses have proven to be disadvantageous, as the pins are prone to breaking at these points.

[0016] If more complex drop-in triggers are installed, their trigger housings are in most cases attached to the lower receiver of the weapon using two pins. Since the spring wires that protect the pins from lateral movement on a standard trigger without their own housing are no longer present in this case, these trigger housings usually have two vertically arranged threaded pins that rest on the bottom of the lower receiver and press the trigger housing upwards, thereby securing the two cylindrical pins. It has been shown that the threaded pins tend to loosen due to the dynamic forces when firing. Therefore, the manufacturers of such triggers usually recommend securing the threaded pins using a threadlocker in the form of an adhesive such as Loctite ®< . However, even with glued screws, the two cylindrical pins in the lower receiver of the weapon often start to move in the axial direction.If such a trigger is to be removed again, the bonding of the threaded pins must first be destroyed.

[0017] There is therefore a need for a trigger for AR-type weapons that can be quickly and easily removed and reinstalled from the lower receiver for cleaning and maintenance. The most effective solution would be a trigger that does not require the removal and installation of other parts of the weapon, such as the safety, the trigger hand grip, and the two cylindrical pins that secure the trigger to the lower receiver. This work should be possible without requiring special knowledge and without creating any loose parts.

[0018] There is also a need for a trigger whose mounting pins in the lower receiver cannot twist or move. Furthermore, there is a need for a trigger whose mounting pins do not require a weakening geometry in the form of U-shaped notches to prevent them from moving sideways. Likewise, there is a need to avoid having to secure the trigger with threaded pins and additional adhesive. The trigger must be mounted so securely in the lower receiver that the shooter does not experience a "spongy" feeling when pulling the trigger, which would negatively affect shooting accuracy.

[0019] Triggers are known in the art that can be removed and installed from the weapon's receiver faster and easier than standard triggers. Triggers are also known whose mounting pins in the receiver's lower section do not have the aforementioned disadvantages, or which do not require fastening with threaded pins and locking adhesive.

[0020] US 2019 / 0368834 A1 and US 2021 / 0102770 A1 show triggers with retractable safety pins suitable for AR-type weapons. Two hollow shafts are screwed into the trigger housings, each of which houses two slidably guided safety pins. Each safety pin has a drive, preferably designed as a hexagon socket, for operation. Furthermore, each safety pin is secured against falling out of the hollow shafts by another pin guided in an L-shaped groove in the hollow shaft. A compression spring is installed between each of the left and right safety pins, which pushes the safety pins outward. These triggers no longer have pins that can twist or move in the holes in the lower housing of the weapon.However, the force of the springs that push the safety pins outward is far too small to press them firmly enough against the walls of the pocket and secure them in the holes. When the trigger blade is pulled, relative movement occurs between the hollow shafts, the safety pins, and the holes, resulting in a "spongy" feeling when the trigger is pulled. The dynamic forces caused by firing the shot cause even greater relative movement and thus, over time, cause the holes in the lower receiver of the weapon to widen. When removing or installing the trigger, all four safety pins must be operated one after the other using an Allen key, or the left and right safety pins of one shaft must be operated simultaneously using two Allen keys. The instructions do not state whether the safety must be removed to remove or install the trigger.

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

[0022] US 2021 / 0222981 A1 shows a trigger that is installed in the weapon receiver using pins with external threads. The receiver has matching internal threads into which the pins are screwed. This trigger is not designed for AR-type weapons, as the holes in the receiver base are through-holes and do not have internal threads into which externally threaded pins could be screwed.

[0023] US 2015 / 0121735 A1 proposes a method for securing a trigger to a receiver lower section, in which externally threaded pins are screwed into the receiver lower section. This trigger is not designed for AR-type weapons, as the holes in the receiver lower section are designed as through-holes and do not have internal threads into which externally threaded pins could be screwed. The walls of the receiver lower section shown in the application were significantly reinforced compared to standard receiver lower sections so that they could be equipped with corresponding internal threads.

[0024] US 2016 / 0341507 A1 discloses a method for preventing the twisting and migration of pins used to install a trigger in the lower receivers of AR-type weapons. To allow the use of standard trigger parts such as the hammer and trigger, the special pins used are provided with the same U-shaped grooves for receiving the spring wires as standard pins, which makes them prone to breakage. It is proposed to prevent the pins from twisting and migration by clipping safety plates over their ends. This method results in various loose parts when removing and installing the trigger.

[0025] US 2022 / 0136792 A1 proposes a method for securing the pins in the lower receiver of AR-type weapons. The special pins used have an internal thread. Each shaft is secured in the lower receiver with two screws on either side. This method ensures that the pins cannot rotate or move. They also do not have any weakening notches around their circumference. However, various loose parts are involved when removing and installing the trigger.

[0026] US 2011 / 0167696 A1 discloses a method for securing the trigger housing to the lower receiver of AR-type weapons. Two vertically arranged threaded pins, accessible from above when the upper receiver is folded down, push the trigger housing off the bottom of the pocket in the lower receiver. This pushing action simultaneously secures the pins that mount the trigger to the lower receiver against twisting and wandering. In practice, such threaded pins tend to loosen after a short time. Many manufacturers therefore recommend securing the threaded pins with a locking adhesive. If the trigger is to be removed for maintenance and service work, the adhesive must be destroyed and then restored after installation. Various loose parts are generated during removal and installation of the trigger.

[0027] The object of the invention is to create a trigger that can be quickly removed and installed from the lower receiver of AR-type weapons. During assembly, no other parts of the weapon, such as the safety, the trigger hand grip, and the two cylindrical pins that secure the trigger to the lower receiver, need to be removed. This work should be possible without requiring special knowledge and without creating any loose parts.

[0028] A further object of the invention is to create a trigger in which the pins for mounting in the lower housing section cannot twist or move. Furthermore, the pins should not have to have a weakening geometry in the form of U-shaped recesses.

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

[0030] The object is achieved by a fume hood having the features of claim 1. Expedient embodiments and advantageous further developments of the invention are specified in the subclaims.

[0031] An inventive trigger that can be quickly installed and removed from the lower receiver of AR-type weapons can be installed and removed in about 1 / 4 of the time required for a standard trigger.

[0032] A trigger according to the invention has a trigger housing which has two hollow shafts, and wherein a hammer is rotatably mounted on one of the two hollow shafts and a trigger 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 pin are displaceably guided, which are connected to one another by means of a threaded spindle.

[0033] In a particularly preferred embodiment of the invention, the hollow shafts in the trigger housing are secured against twisting by means of a positive locking 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 pins in the hollow shafts are secured against rotation by means of a positive fit. If the trigger is mounted in the lower receiver of the weapon, the bearing pins are guided with their cylindrical sections in the bores in the lower receiver of the weapon and are supported with their contact surfaces on the inner walls of the pocket.

[0036] In a further, particularly preferred embodiment of the invention, the bearing pins can be retracted into the hollow shafts to such an extent that neither the bearing pins nor the threaded spindles protrude beyond the hollow shafts. In this state, the trigger can be removed from or inserted into the lower housing section.

[0037] The invention is explained below by way of example with reference to the figures. They show: Fig. 1: An AR-type weapon with a built-in standard trigger, according to the state of the art, in a perspective view, Fig. 2: An AR-type weapon with the upper receiver folded down, without a built-in trigger, in a perspective view, Fig. 3: A standard trigger pin, according to the state of the art, in a perspective view, Fig. 4: An AR-type weapon with the upper receiver folded down, with a built-in standard trigger, hammer in the fired position, according to the state of the art, in a perspective view, Fig. 5: An AR-type weapon with the upper receiver folded down, with a built-in standard trigger, hammer in the fired position, an auxiliary tool, according to the state of the art, in a view from above, Fig. 6: An AR-type weapon with the upper receiver folded down, with a built-in standard trigger, hammer in the fired position, according to the state of the art, in a half-section, in a view from the left, Fig.7 a trigger in the assembled state, hammer in the released position, with the bearing pins extended, in a perspective view, Fig. 8 the trigger in an exploded view, hammer in the released position, with the bearing pins retracted, in a perspective view, Fig. 9 a subassembly of a trigger shaft, with the bearing pins extended, in a perspective view, Fig. 10 the subassembly of a trigger shaft, with the bearing pins extended, in a half-section, Fig. 11 the subassembly of a trigger shaft, with the bearing pins retracted, in a half-section, Fig. 12 the subassembly of a trigger shaft, with the bearing pins extended to the stop, in a half-section, Fig. 13 the subassembly of a trigger shaft, in an exploded view, Fig. 14 a safety, in a perspective view, Fig.Fig. 15: The AR-type weapon with the upper receiver folded down, with the trigger installed, the hammer in the cocked position, and the safety lever in the "SAFE" position, in a half-section, viewed from the left. Fig. 16: The AR-type weapon with the upper receiver folded down, with the trigger installed, the hammer in the disengaged position, and the safety lever in the "SEMI" position, in a half-section, viewed from the left. Fig. 17: The AR-type weapon with the upper receiver folded down, the hammer in the cocked state, the trigger in the first section of the insertion movement into the lower receiver, and the safety lever in the "SEMI" position, in a half-section, viewed from the left. Fig. 18: The AR-type weapon with the upper receiver folded down, the hammer in the cocked state, the trigger in the second section of the insertion movement into the lower receiver, and the safety lever in the "SEMI" position, in a half-section, viewed from the left.

[0038] Below, elements that are exactly the same but installed multiple times and in different locations are distinguished from one another using a letter index. For example, in the list of reference symbols, the standard trigger pin is designated by reference number 14, and the explanatory text distinguishes between the front standard trigger pin 14a and the rear standard trigger pin 14b, as these are installed in different locations.

[0039] Fig. 1 shows a weapon of the type AR 3. The upper housing part 2 and the lower housing part 5 are connected by means of the rear housing pin 1 and the front housing pin 4. In the lower housing part 5 there is a standard trigger 6 (see also Figures 5 and 6 ), from which the standard tongue 7 protrudes downwards from the lower housing part 5.

[0040] In Fig. 2An AR 3 weapon without a built-in trigger is shown. The rear receiver pin 1 is pulled out as far as it will go, and the upper receiver section 2 is folded away from the lower receiver section 5 as far as possible via the front receiver pin 4. Also visible is the pocket 8 with its base 9, its left wall 10, and its right wall 11, as well as the front transverse bore 12 and the rear transverse bore 13, which completely penetrate the two walls 10 and 11.

[0041] Fig. 3shows a standard trigger pin 14. Using two of these pins 14a and 14b, standard triggers can be installed in the lower housing section 5. The two U-shaped recesses 15 and 16 can be seen, in which spring wires are located when installed to prevent the pin from moving in the axial direction. The recess 15 is positioned in the center of the pin and the recess 16 is positioned more to the side, 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.

[0042] The Figures 4 , 5 and 6show a standard trigger 6, installed in an AR 3 weapon. The standard hammer 19 is in the released position and protrudes almost vertically upwards from the lower housing section 5. The standard trigger 6 is secured in the lower housing section 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 blade 7 is rotatably mounted on it. One of the two legs 58 or 59 of the standard hammer spring 20 lies in the recess 16 (see Fig. 3 ) on the rear standard trigger pin 14b and is intended to prevent the pin from moving in the axial direction. The spring wire 22 is located in a stepped bore 21 in the standard hammer 19 and is inserted into the recess 15 (see Fig. 3) rests on the front standard trigger pin 14a and is intended to prevent the pin from wandering in the axial direction. It is clear that both the front standard trigger pin 14a and the rear standard trigger pin 14b do not have to be mounted in a direction-specific manner, since the centrally located recess 15 on the front pin 14a and the more laterally located recess 16 on the rear pin 14b are used to position the pins in the axial direction. One of the two legs 58 or 59 of the standard hammer spring 20 always rests in the recess 16, regardless of whether the rear pin 14b was mounted such that the recess 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.

[0043] In the Fig. 5 an auxiliary tool in the form of a driver 23 is shown. By means of such a driver 23 and with the aid of a Fig. 5For the hammer shown, the standard trigger pins 14a and 14b are hammered into the transverse bores 12 and 13, respectively, and driven out again during disassembly. It is irrelevant from which side of the lower housing section 5 and in which orientation the pins are mounted.

[0044] Fig. 7 shows a trigger 24 according to the invention in the assembled state. It is designed as a drop-in trigger and therefore has its own trigger housing 27. The hammer 25 is in the released position. The blade 26 of the trigger 24 protrudes downwards from the trigger housing 27. Also visible are the hammer spring 28, the switching shaft 29 and the interrupter 30. The function of the switching shaft 29 and the interrupter 30 will not be explained in detail here, as this is irrelevant for the further explanations. The two left bearing pins 31a and 31b, as well as the two right bearing pins 32a and 32b are connected by means of a Figures 9 ,10 , 11 , 12 and 13 The bearing pins 31a, 31b and 32a, 32b are shown in the fixed position in the housing base 5, in which the contact shoulders 37 and 38 rest against the inner surfaces 17 and 18 of the walls 10 and 11. Fig. 7 the two right bearing pins 32a and 32b with their bearing shoulders 38 are not visible because they are covered by the trigger housing 27.

[0045] In Fig. 8the individual parts of the trigger 24 are visible. The two subassemblies of the trigger shaft 33a and 33b are installed in the trigger housing 27. The hammer 25 is rotatably mounted on the front subassembly of the trigger shaft 33a, and the trigger 26 is mounted on the rear subassembly of the trigger shaft 33b. The hammer 25 has the locking surface 34 and the trigger 26 has the locking surface 35. The two left-hand bearing pins 31a and 31b, as well as the two right-hand bearing pins 32a and 32b are retracted into the subassemblies of the trigger shaft 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 the housing lower part 5 and reinserted. The hammer spring 28 is designed as a double leg spring, the legs of which are supported on the hammer 25 and in the trigger housing 27 and the windings of which are guided on the two laterally projecting extensions on the hammer 25.

[0046] The Fig. 9 shows a subassembly of a take-off shaft 33. The left bearing pin 31 and the right bearing pin 32 are connected by means of the threaded spindle 39 (see Fig. 10 , 11 , 12 and 13 ) is moved out of the hollow shaft 36 as far as in the state installed in the lower housing part 5, in which the left bearing pin 31 is pressed with its contact shoulder 37 against the inner surface 17 of the left wall 10 and the right bearing pin 32 is pressed with its contact shoulder 38 against the inner wall 18 of the right wall 11.

[0047] 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 whose outer shape is diamond-shaped. The four corners of the diamond shape are rounded with radii for easier manufacture and to minimize the notch effect. The shoulder 61, due to its diamond shape, forms a rotation lock with respect to 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-twist device of 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. The two bores in the left wall and the two diamond-shaped openings in the right wall of the trigger housing 27 are positioned accordingly. The assembly of the subassembly of the trigger shaft 33 in the trigger housing 27 must then take place 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 subassembly of the trigger shaft 33 in the trigger housing 27 in the axial direction (see also . Fig. 8 ). Other designs of the groove 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 ).

[0048] The Fig. 10also shows a subassembly of a trigger shaft 33, the bearing pins 31 and 32 of which are extended as far 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-hand side of the weapon, so that the bearing pins 31 and 32 are extended by operation in a clockwise direction and retracted by operation in a counterclockwise direction. This function is achieved in that the threaded section on the threaded spindle 39 on the side of the drive is designed as a right-hand thread section 41 and the opposite threaded section is designed as a left-hand thread section 40. A relief cut 42 is arranged between the two threaded sections.

[0049] 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-twist device in the also diamond-shaped opening 62 of the hollow shafts 36 and is designed analogously to the anti-twist device of the hollow shafts 36 with respect to the trigger housing 27 (see also Figures 9 and 13 ). The anti-rotation device of the bearing journals 31 and 32 relative to the hollow shafts 36 does not have to be diamond-shaped, but can be formed by any other type of positive locking. The locking pin 48 is inserted into a bore 49 in the hollow shaft 36 running transversely to the axis D (see also Figures 9 and 13 ).

[0050] In the Fig. 11The state of the subassembly of the trigger shaft 33 is shown, in which the bearing pins 31 and 32 are retracted into the hollow shaft 36 until they stop against the locking pin 48. In this state, the trigger 24 can be removed from the housing base 5 for removal and installation and reinserted, since the length of the hollow shafts 36 approximately corresponds to the width of the trigger housing 27 and the two ends of the hollow shafts 36 in the assembled state are approximately flush with the left and right outer wall of the trigger housing 27 (see also Fig. 8 ).

[0051] To prevent the user from turning the threaded spindle 39 counterclockwise until the bearing pins 31 and 32 are released from the threaded spindle 39 and fall out of the hollow shaft 36 when the trigger 24 is removed from the lower housing section 5, the threaded spindle 39 is provided at its end opposite the Torx ®< drive 43 with a Fig. 12visible countersink 50. During factory assembly of the trigger 24, the countersink 50 is compressed with a special tool in such a way that the first thread is deformed and the left bearing pin 31 cannot be unscrewed from the threaded spindle 39 without considerable force. Due to the guidance of the two bearing pins 31 and 32 in the hollow shaft 36 and their synchronized, counter-rotating movement in the axial direction when the threaded spindle 39 is rotated, this measure also prevents the right bearing pin 32 from being unscrewed from the threaded spindle 39 without considerable force.

[0052] The Fig. 12The subassembly of the trigger shaft 33 shown shows the state in which the deformed first thread of the threaded spindle 39 blocks the internal thread 46 of the left bearing journal 31, since it represents a stop against the left bearing journal 31. This state can only be achieved when removed from the lower housing part 5, since 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.

[0053] Hole 49 (see Fig. 9 And 13) for the locking pin 48 is positioned in the hollow shaft 36 so that in the Fig. 12 In the state shown, neither of the two bearing pins 31 or 32 can fall out of the hollow shaft 36, since the other bearing pin is previously blocked by the locking pin 48.

[0054] In Fig. 13The individual parts of the subassembly 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, since the bore is covered by the hammer 25 or the trigger 26 (see also Fig. 7 and 8 ). Thus, the locking pin 48 does not need to be secured in the axial direction by, for example, gluing, caulking, pressing or shrinking (see also Figures 15 and 16 ).

[0055] In the Figures 1 , 2 , 4 and 5 An example of a weapon of the AR 3 type was shown, in which the safety lever 52 of the safety 51 has three possible positions engraved on the lower housing part 5: SAFE (Safe) SEMI (Semi-automatic fire) AUTO (Fully automatic fire)

[0056] The 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, for example, by screwing or pinning. Ambidextrous safeties are also known, which have a safety lever at both ends of the safety shaft. Visible are the circumferential surface 54, which blocks the trigger 26 in the "SAFE" position, and the flattened portion 55, which allows the trigger 26 to be pulled back in the "SEMI" position. The "AUTO" position will not be explained in detail here, as it is irrelevant for the following explanations.

[0057] In the Figures 15 and 16 the interaction between the safety shaft 53 and the tongue 26 is explained in more detail.

[0058] In the Fig. 15the hammer 25 is in the cocked state and the safety lever 52 (shown in the sectional view in the Fig. 15 not visible) in the "SAFE" position. The hammer 25 rests with its locking surface 34 on the locking surface 35 on the trigger 26. The safety shaft 53 blocks the trigger 26 with its circumferential surface 54. The rear end of the trigger protrudes only as far as absolutely necessary beyond the vertical axis V, which runs through the pivot point of the safety shaft 53. The insertion bevel 56 can be seen. Also visible is a gap between the underside of the trigger housing 27 and the base surface 9. The trigger 24 is therefore not seated in the lower housing section 5, but is held exclusively by the subassemblies of the trigger shafts 33.

[0059] In the Fig. 16The hammer 25 is in the struck position, the safety lever 52 is in the "SEMI" position, and the safety shaft 53, through its flattened portion 55, allows the trigger 26 to be pulled back. Upon actuation of the trigger 26, the locking 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 housing section 2.

[0060] Fig. 17 shows that during installation the trigger 24 must be held diagonally upwards so that the trigger 26 moves past the safety shaft 53 and at the same time can be threaded through the opening 57 in the lower housing part 5.

[0061] Out of Fig. 18It can be seen that the insertion bevel 56, in conjunction with the rear end of the trigger 26 being kept as short as possible, 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 portion 55 of the safety shaft 53 is in a horizontal position.

[0062] From the Figures 17 and 18 It becomes apparent that in order to remove or install a trigger 24 according to the invention, the safety 51 and the handle for the trigger hand do not have to be dismantled.

[0063] 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 the type AR 3.

[0064] Removing the trigger: 1. Pull out the rear housing pin 1 as far as it will go and fold the upper housing section 2 away from the lower housing section 5. 2. If the hammer 25 is in the fired position, return it to the cocked position. 3. Using a suitable Torx®< wrench, retract the bearing pins 31 and 32 of both subassemblies of the trigger shafts 33 into the hollow shafts 36 by turning them counterclockwise until they rest against the locking pins 48. 4. Remove the trigger 24 from the lower housing section 5.

[0065] Installing the extractor: 1. If the hammer 25 is in the disengaged position after maintenance or cleaning, return it to the cocked position. 2. Hold the trigger 24 diagonally upwards 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 flattened portion 55 on the safety shaft 52 and the base surface 9 until the trigger housing 27 can be placed on the base surface 9. 4. Using a suitable Torx ®< key, extend the bearing pins 31 and 32 of both subassemblies of the take-off shafts 33 by turning them clockwise out of the hollow shafts 36 until they are centered in the transverse bores 12 and 13 and their contact shoulders 37 and 38 rest on 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 screw drives firmly. 6. Fold the upper housing section 2 back onto the lower housing section 5 and press the rear housing pin 1 in as far as it will go.

[0066] In a further embodiment of the invention (not shown), the threaded spindle 39 is equipped with a drive at both ends. In this embodiment, operation can be performed from either side of the weapon.

[0067] In order to deform the last thread and thus create a stop for the left bearing journal 31, the threaded spindle 39 does not necessarily have to be equipped with a counterbore 50. This can also be achieved if the affected end is equipped with a drive, such as a hexagon socket or Torx ®< drive.

[0068] In a further embodiment of the invention (not shown), the threaded spindle 39 is equipped with a drive at its left end. Operation must then be performed from the left side of the weapon.

[0069] A design is also possible in which the right threaded section of the threaded spindle 39 is designed as a left-hand thread and the left threaded section as a right-hand thread. The internal threads of the bearing journals must then be designed accordingly.

[0070] In further embodiments of the invention not shown, the drive of the threaded spindle 39 can also be designed as a slot, Phillips, hexagon socket or any other desired drive form.

[0071] 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 lock. This thread lock can be implemented, for example, as a thread wire insert, as a chemical thread lock in the form of a spot coating, or in any other form.

[0072] In a further embodiment of the invention, not shown, the rear end of the tongue 26 does not have an insertion bevel 56, but has any other contour which makes it possible, with the safety 51 installed, to guide the tongue 26 through the opening 57 when inserting the trigger 24 into the pocket 8 in the lower housing part 5 and to insert the rear end of the tongue 26 between the safety shaft 53 and the bottom surface 9. List of reference symbols

[0073] 1Rear receiver pin 2Upper receiver 3AR-type weapon 4Front receiver pin 5Lower receiver 6Standard trigger 7Standard trigger blade 6 8Pocket 9Bottom surface 10Left wall 11Right wall 12Front cross hole 13Rear cross hole 14Standard trigger pin 15Center-positioned recess 16Side-positioned recess 17Inner surface of left wall 10 18Inner surface of right wall 11 19Standard hammer 20Standard hammer spring 21Stepped hole for spring wire in standard hammer 19 22Spring wire in standard hammer 19 23Driver 24Trigger 25Hammer 26 Blade 27Trigger housing 28Hammer spring 29Switch shaft 30Disconnector 31Left Bearing journal 32Right bearing journal 33Subassembly of the trigger shaft 34Locking surface on the hammer 25 35Locking surface on the trigger 26 36Hollow shaft 37Side shoulder on the left bearing journal 31 38Side shoulder on the right bearing journal 32 39Threaded spindle 40Left-hand thread section 41Right-hand thread section 42Undercut 43Torx ®< drive 44Securing wire 45Set screw 46Internal threaddesigned as a left-hand thread 47Internal thread designed as a right-hand thread 48Locking pin 49Hole for locking pin 48 50Countersink 51Safety 52Safety lever 53Safety shaft 54Circumferential surface 55Flattening 56Insertion chamfer 57Opening in the housing base 5 58First leg of the standard hammer spring 20 59Second leg of the standard hammer spring 20 60Groove 61Shoulder 62Opening in the hollow shaft 36

Claims

1. Quickly removable and installable trigger from the lower receiver of AR 3 type weapons, characterized in that 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 tongue (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).

2. Deduction according to claim 1, characterized in that both hollow shafts (36) are secured against rotation in the trigger housing (27) by having a positive connection to the trigger housing (27) in the direction of rotation.

3. Deduction according to claim 2, characterized in thatboth hollow shafts (36) are secured against rotation in the trigger housing (27) in that they have a shoulder (61) at one end which is diamond-shaped and which can be inserted axially into two openings in a wall of the trigger housing (27) which are also diamond-shaped but cannot be rotated.

4. Deduction according to claim 1, characterized in that both hollow shafts (36) are secured against falling out of the trigger housing (27) in that they have at least one groove (60) in which a safety wire (44) runs when installed in the trigger housing (27).

5. Deduction according to claim 4, characterized in that the safety wires (44) are secured against falling out of the trigger housing (27) by means of threaded pins (45).

6. Deduction 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. Deduction according to claim 1, characterized in thatthe threaded spindles (39) have at least one drive for an operating tool.

8. Deduction according to claim 7, characterized in that the drive of the threaded spindles (39) as Torx ® -drive (43).

9. Deduction according to claim 1, characterized in that the right bearing journals (32) and the left bearing journals (31) are secured against rotation in the hollow shafts (36) by having a positive connection to the hollow shafts (36) in the direction of rotation.

10. Deduction 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 into the likewise diamond-shaped opening (62) in the hollow shafts (36) but cannot be rotated.

11. Deduction according to claim 1, characterized in thatin the lower housing part (5) mount state of the trigger (24) the left bearing pins (31) are guided with their cylindrical section in the bores (12) and (13) in the left wall (10) and are supported with their contact shoulders (37) on the inner surface (17), and that the right bearing pins (32) are guided with their cylindrical section in the bores (12) and (13) in the right wall (11) and are supported with their contact shoulders (38) on the inner surface (18), wherein the force for supporting is applied by rotating the threaded spindles (39) by means of an operating tool.

12. Deduction according to claim 1, characterized in that the bearing journals (31) and (32) can be retracted into the hollow shafts (36) so far that they do not protrude beyond the hollow shafts (36).

13. Deduction according to claim 1, characterized in that the hollow shafts (36) have a bore (49) extending transversely to the axis D for a locking pin (48).

14. Deduction according to claim 13, characterized in that; when the right bearing journal (32) and the left bearing journal (31) simultaneously rest with their bottom surfaces on the locking pin (48), neither the right bearing journal (32) nor the left bearing journal (31) and the threaded spindle (39) protrude beyond the hollow shaft (36).

15. Deduction according to claim 1, characterized in that it can be inserted into the pocket (8) in the lower housing part (5) when the bearing pins (31 and 32) are fully retracted.

16. Deduction according to claim 15, characterized in that the rear end of the tongue (26) has a contour which allows, when the safety (51) is installed, the tongue (26) to be guided through the opening (57) when the trigger (24) is inserted into the pocket (8) in the lower housing part (5), and the rear end of the tongue (26) to be inserted between the safety shaft (53) and the base surface (9).

17. Deduction according to claim 16, characterized in that the tongue (26) has an insertion bevel (56).