KR850000519B1 - Gun - Google Patents

Abstract

A pivotally mounted trigger (73) is connected to rotate a pivotal sear (700). A reciprocal bolt carrier assembly (3) has a lug (325) to engage with the rear of the sear or a notch (717) in the top of the sear. Mounted on the pivot (731) of the trigger is a prop member (745) to cooperate with an L-shaped nose (720) of the seat. When the trigger is pulled to rotate the sear in a first direction out of engagement with the lug, the prop member is initially prevented from moving with the trigger by the nose of the sear. When the lug is released by the sear, the sear is further rotated in the first direction by the lug contacting the upper sear surface to free the prop member to move toward the trigger and under the nose. The prop member then prevents the sear from rotating in the opposite direction until the trigger is released.

Description

Cow gun

1 is a left side view of a gas operated fully automatic rifle according to the present invention.

FIG. 2 is a right side view of the partial longitudinal section of the rifle shown in FIG. 1, with the tumbler being pulled and ready for firing.

3 is a right side view of the partial longitudinal section of the rifle shown in FIGS. 1 and 2 with the trigger pulled and the bolt in the firing position.

4 is a right side view of a partial longitudinal cross-sectional view of the rifle shown in the figures, with the bolt in its rearmost position so that the trigger is pulled and another ammunition can be supplied.

5 is a partial cross-sectional view of the gun in accordance with the present invention showing the trigger mechanism in a rest position.

6 is a partial cross-sectional view of the trigger mechanism of FIG. 5 with the trigger pulled.

The present invention relates to a rifle and parts thereof, in particular to an automatic gun in gas operation, and the invention can also be used in a semi-automatic gun.

Automatic guns are well known, and the term refers to a gun in which a number of ammunition is fired continuously as long as the trigger is held down or until the final ammo is fired. Semi-automatic guns are also well known, and the term means that when a trigger is fired, one ammo is fired, the cartridge is ejected, the bolt is retracted, and the next ammunition is automatically loaded but until the trigger is released and pulled again. A gun that does not fire the next ammo. Automatic guns and semi-automatic guns are generally of three types: recoil-operated, blow-back-actuated, gas-actuated and the operating form of the present invention relates to gas-actuated.

Automatic and semi-automatic guns are described in many literatures, for example, in the tenth edition of "Stackpole Books" in Harrisburg, PA, USA, which is fully revised by "Joseph E. Smith." W. H. B. Smith's World Fire Extinguishers ”and 2“ Jane's Publishing Company ”and“ Dennis H. egg. "Janes Infantry Weapon" (1977), edited by Asher, is a well-known form of gas-operated automatic gun.

Gas-operated guns, such as the AR 18, have a receiver that surrounds a bolt / bolt carrier assembly that is pushed towards the barrel by drive springs and is triggered by a trigger penetrating the middle of the shear. Have. A radial hole penetrating the barrel wall is provided at a distance along the barrel length, and the gas piston and cylinder assembly cooperate with the hole externally. In operation, the bolt / bolt carrier assembly takes one ammunition from the magazine and feeds the ammunition into the receiving region, and the bolt is driven to load the ammo into the chamber. The bolt is then rotated to a fixed position to ensure that the ammunition is held firmly in the chamber. Because the bolt / bolt carrier assemblies are slidable and rotatable relative to one another and the ball is mounted to the bolt carrier assembly, the bolt is rotated and fixed when the ball fires ammunition by the final forward motion of the bolt carrier assembly. The gas is generated by the firing of the ammo, which enters the hole when the bullet passes through the radial hole and into the gas cylinder while the bullet is in the barrel. Of course, when the bullet leaves the barrel, the gas dissipates. The gas cylinders are arranged as movable parts and are connected to the bolts and carrier assemblies by rods, so that when the cylinders are filled with gas they are driven backward by the gas to release the bolts, eject the casings and discharge and retract the bolts. You will be ready for the next run.

It is noted that the movable cylinder does not have the same running length as the bolt carrier assembly.

Like many other automatic weapons, the AR 18 rifle shoots from a closed position. That is, the position means that the bolt / bolt carrier assembly is always in front, and that the ammunition is loaded in the electrical working cycle so that only the hammer or other light firing furniture moves when the trigger is pulled. That is, the bolt / bolt carrier assembly does not move until after the shot has taken place and no action or force is applied to the gun before firing. This is because the bolt / bolt carrier assembly is held behind the supply area by an electrical actuation cycle and the bolt carrier is captured by the shear before the bolt / bolt carrier assembly is driven forward by the drive spring. It is distinguished from a gun (like the M-60 machine gun) that fires from. Thus, the ammunition is not initially loaded, but when the trigger is pulled, the bolt / bolt carrier assembly is released and driven forward by the main spring to load and fire the ammunition. In the case of shooting from the bolt open position, the gun is exerted before firing due to the reaction of the driving spring when pushing the bolt carrier forward.

In the operating cycle, the bolt carrier can travel past the feed area, for example the magazine receptacle, to a rear position to supply and load other ammunition.

In known gas-operated guns, it is common for the bolt carrier to impinge on the rear wall of the receiver to limit its reverse range, and in many known guns, such as the M-60, the collision passes through the middle of the shock absorber.

The term "buffer" as used herein means a means disposed between the bolt carrier assembly and the detent so as to quickly detain the bolt carrier and having a force at least twice as large as that of all other combined spring force averages. do.

Thus, in known gas-operated guns, not only recoil occurs from the gun when firing ammunition, but also when the carrier assembly impinges on the rear wall of the receiver, even if it passes through the middle of the shock absorber. The reaction of such a reaction to the shooter causes the barrel to move upward, resulting in inaccurate shooting. Such automatic guns typically fire about 6-12 shots per second, and the shooter needs 1-2 seconds to re- aim to compensate for these recoil effects. Such weapons tend to be inaccurate due to miscontrol by the shooter.

While such misadjustment is considerably mitigated in blowback and recoil guns by providing flexible recoil, the solutions used in such guns are not applicable to gas operated guns because of the operational differences between the types of guns. Recoil-operated guns have lost popularity due to the barrels prepared for firing and the complexity of moving the bolt / bolt carrier assembly backwards, and blow-back operated guns are only partially used for short range ammunition. For these reasons, it's important to note that mud and sand are not blocked.

In gas-operated guns, many attempts have been made to reduce the impact of bolt carriers impinging on the rear receiver wall to provide zero restitution. The term "repulsion" refers to the proportion of energy from a collider that returns to the collider upon impact on a fixed solid material. Thus, when the steel bolt carrier collides with the steel rear wall of the receiver, most of the energy of the colliding carrier assembly is returned to the carrier by the rear receiver wall in the opposite direction. In such cases, it is said that there is a 100% rebound, i.e. a very high recoil and AR 18 is an example.

In the M-16 rifle (described on pages 650-653 of "World Fire Extinguishers" and pages 226-228 of "Jains Infantry Weapons"), the bolts are used to absorb some of the energy of the bolts that impinge on the rear receiver walls. Attempts have been made to reduce repulsion by installing shock absorbers by the tail of the carrier assembly. The shock absorber is compressible between the tail receiver wall and the tail of the bolt carrier assembly. Although the recoil rate of the M-16 is considered low, it has been found that recoil is caused significantly by the rear receiver wall where the shock absorber / bolt carrier assembly collides.

The recoil effect on gas-operated guns is considered to be less than that of many bolt-operated guns, although not automatic. At this point, both guns have a fixed, rigid structure that delivers ammunition shock when the bullet passes through. Light recoil is due to the gas driving the front wall of the fixing member as well as the in-cylinder gas driving the movable member such as a cylinder or piston to the rear. Thus, gas operated guns tend to have a "flexible" action than the bolt operated guns described above.

Because of the impact of recoil on the controllability of conventional gas operated guns, the accuracy of such guns is poor. Attempts to improve the hit rate of such gas-operated guns include three consecutive firing limiters, high-speed rifle firing three to four shots very quickly so that the gun does not have time to depart from the target, and two or three at every trigger. Includes double or triple ammunition for firing feet. However, none of these have been successful and have not improved the accuracy of gas-operated automatic guns.

It is an object of the broad meaning of the present invention to provide a novel fire extinguisher, in particular a novel gas operated gun.

It is known to provide a reciprocating bolt carrier assembly which is selectively held in release and ready for firing by a rotatable sheer actuated by a rotatable trigger on an automatic or semi-automatic gun of the kind firing from the bolt open position. In such guns, the bolt carrier assembly typically has sheer engagement lugs arranged to engage the upper tail portion of the sheer. Thus, the bolt carrier assembly is prevented from moving forward to the firing position when the sheath engagement lug engages the upper tail portion of the sheer. In guns such as the M-60 machine gun described above on pages 695-699 of "World Fire Extinguishers" and pages 332-337 of "Jains Infantry Weapons," the bolt carrier assembly is located behind the ammunition supply area by a previous firing cycle. Is retained. In this respect the bolt carrier is fixed by the sheer before the bolt carrier assembly is driven forward by the bolt carrier assembly drive spring. Since the firing cycle is usually completed when the bolt carrier assembly is in front, the bolt carrier assembly is pulled backwards and grasped to allow ammunition to be burned so that the shear engagement lugs engage the sheer.

It is obviously necessary for the bolt to be withdrawn after the base of the ammunition to allow the ammunition to rise into the supply area. However, it will be appreciated that when the bolt is manually retracted or the gun is dropped from his butt, the bolt carrier assembly can be withdrawn back enough to raise ammunition into the supply zone but insufficiently to secure the sheer engagement lug to the sheer. . To overcome this problem, it is known to provide a notch on the top of the sheer that the sheer lugs can engage at a point in the bolt's advance cycle before the ammunition is loaded, the bolt is fixed to the barrel and the ammunition is fired.

However, it has been found that the trigger in such a notch tends to damage the lugs and notches by rubbing the lugs around the notch when pulled out. As the bolt stops on the notch, an undesirable result is that the ammunition can be partially lifted out of the magazine and partially loaded in the chamber, which can interfere with the removal of the magazine. In addition, when the final ammo is fired and the empty magazine is replaced by a new magazine, the trigger's ammunition shoulder is stopped in front of the ammunition base, so the trigger is pulled and the bolt is released from the notch.

The present invention provides an automatic or semi-automatic gun with a novel trigger mechanism that eliminates the aforementioned drawbacks.

According to the present invention, a pivotable shea having a notch provided to selectively engage a lug of a reciprocating bolt means and a notch arranged to engage and cooperate with the lug and formed on the upper surface of the sheath adjacent the bolt means and A connected and pivotally mounted trigger, and biased by a spring to cooperate with a portion of the sheer and move with the trigger so that when the trigger is pulled to rotate the shear away from engagement with the lug in a first direction Movement with the trigger by the sheer portion is prevented and when the lug is dislodged by the sheer the sheer is further rotated in the first direction by a lug in contact with the top surface of the sheer to allow the member to move freely below the sheer portion towards the trigger. To the opposite direction of the first direction until the trigger is released. A gun is provided having a trigger mechanism that prevents the sheer from rotating in the direction and includes a member mounted on the trigger shaft.

The sheer portion is preferably an L-shaped extension on the shaft portion of the sheer pivot which is the same as the side driven by the trigger. It is also advantageous that the member is biased by a spring to contact a portion of the trigger on the side of the trigger pivot away from the sheer pivot.

As used herein, "front" and "rear" and similar adverbs are used relative to the muzzle, with the head rearward and the muzzle forward.

The invention is described in more detail below by way of examples with reference to the accompanying drawings. Like numbers in the drawings indicate like parts.

The gas-operated automatic gun shown in FIG. 1 has a receiver 1, with a butt 2 connected to the rear wall channel 131 of the receiver and a barrel 10 at the end of the receiver 1 on the opposite side from the butt 2. It is connected. The pistol handle 11 is connected to the lower side of the receiver 1 by screws and nuts and the front handle 12 is connected to the lower side of the barrel 10 by screws. The pistol handle 11 is connected to the receiver 1 through the middle portion of the trigger guide 72 covering the trigger assembly 73 with a rotatable shea actuator 77.

The magazine 4 is mounted in the bottom groove of the receiver 1. The magazine may be a drum, but may be a flat box magazine. Magazine 4 is held in the receiver by magazine latch assembly 5 with a spring arm 500. The spring arm has a 90 ° twisted portion 501 and pins 502, 503 extending through the side wall of the receiver to engage the holes of magazine 4. Pins 502 and 503 prevent the magazine from moving back and forth and from side to side, and the magazine is mounted with a vertical key 410 mounted in a C-shaped wall 510 formed of the vertical front portion of the trigger guard 72.

The spring arm 500 moves away from the receiver by force applied to the right end (as viewed from the front) of the actuator rod 505 through both sides of the receiver 1 to disengage the pins 502, 503 from the magazine 4. It is arranged to be pressed.

Bolt retraction handle assembly 6 is installed on the left side of receiver 1, the assembly having a bolt retraction rod subassembly 60 including a bolt retraction rod 600 to which a rotatable bolt retraction handle 601 is connected. Bolt retraction rod 600 is formed by a "C" cross-sectional sheet material 602 in which opposing open surfaces of "C" are welded to the receiver and the upper portion of "C" is removed to form leg 603 of U-shaped cross section. Guided, leg 603 acts as a rail for bolt futo rod 600. Bolt Retracted Handle 601 Silver

The rear scale mount 96 is installed on the upper rear of the receiver 1, and a carrying handle 97 is attached to the right side of the receiver. In addition, a discharge slot 104 is formed at the right side of the receiver and four cooling holes 105 are provided at both sides of the receiver to assist in removing heat from the rear end of barrel 10 in front of the receiver. have. A gas system 9 is connected between the front of receiver 1 and the front latch assembly 95. A barrel bayonet 98 is provided in the barrel and a flash suppressor 99 is provided in the barrel.

2, 3 and 4, the trigger assembly 73 has an arched trigger 730 rotatably mounted to a rod 731, the trigger 730 being acted upon by a spring 732 acting in a blocked hole 736 in the trigger. Biased, one end of the spring 732 is supported by the closure of the blind hole 736 and the other end is supported by the trigger spring retainer 733 which is secured to the receiver. Retainer 733 is located in the guide slot 734 of the trigger. The upper rear surface 735 of the trigger 730 acts on the sheer assembly 7 through the middle portion of the sheer actuator 77. Shear actuator 77 has a hollow cylinder 77 extending between the main walls of the receiver and is mounted with a spring biased actuator 771 across the axis of the cylinder, towards the trigger upper rear surface 735. Shear assembly 7 has a shear 700 rotatably mounted to a transverse rod 701 that passes through the lateral limits of the U-shaped sheath buffer 705 into the opposite sidewall stones of the receiver. A horizontal bar 706 is disposed at the bottom of the U-shaped shea shock absorber 705, that is, to the rear of the gun, and the horizontal bar 706 is mounted to the receiver. The shock absorber 705 is positioned by a cross rod 504 of circular cross section, which assists in securing one end of the spring arm 500 and holding the shock absorber 705 downward. The sheer 700 is biased in the non-launch position by a compression spring 702 located between the recess 703 of the sheer 700 and a stud 704 mounted on the base of the receiver.

Bolt carrier assembly 3 is slidably mounted on the rail 101 of the receiver, the bolt carrier assembly having a block 300 in a form suitable for contacting the rail 101, with a pair of vertical sheer fixation lugs on the block. 325 (see FIGS. 2, 3 and 4) are mounted one at each side of the longitudinal axis of the gun (only one is shown in cross section in FIGS. 2, 3 and 4). The sheet member 301 of the "P" cross-sectional shape is welded to the upper part of the block 300, and the upright part of the "P" is arrange | positioned horizontally. Wound part of "P"

For ease of explanation, the main drive spring combination 302 is shown as if it is on the axial centerline of the gun, but the assembly 302 is actually knitted on the right side of the centerline from the front so as not to obstruct the gas piston. Put it. The main drive spring assembly 302 has a guide rod 303 of circular cross section having end portions 304 and 305, respectively, and a parallel planar portion 306 is formed in the portion between the end portions 304 and 305. The main drive spring 307 is mounted on the guide rod 303. At the end of the P-shaped member 301 remote from the block 300, a bush 308 with a recess 309 is provided, a spring 307 is located within the recess 309, and the bush 308 also slides the end 304 of the guide rod 303. It has the groove part 310 of the circular cross section accommodated as much as possible. At the end of the main drive spring 307 far from the bush 308, a collar 311 mounted to the guide rod 303 by a horizontal pin 312 is provided. The purpose of the collar 311 is to provide an end retainer for the spring 307 and to support the trailing end of the guide rod 303 on the lug 102 of the receiver trailing wall 100 mounted in the channel 131. The transverse pin 312 extends through the slot formed in the sidewall of the receiver and thus prevents the rear wall 100 from leaving unless the collar 311 is removed from the lug 102 by sliding the transverse pin 312 forward.

A ball 313 is mounted on the longitudinal axis of the barrel and inside the block 300, the ball 313 is biased in a rearward position by the compression spring 314, and its running limit is at slot 315 of the ball which cooperates with the transverse pin 316. Retained, spring 314 and pin 316 are provided for removal of the ball.

The front portion of the ball is disposed in bolt 317, which bolt is slidably rotatable along the longitudinal axis of the barrel within block 300 and is thus movable relative to the carrier assembly. The bolt 317 has a cam pin 318 which cooperates in a known manner with the cam slot (not shown) on the left side of the block 300 (as seen from the front). The bolt 317 is also provided with a discharge pin 319 arranged in the usual manner to the left of the barrel longitudinal axis (viewed from the front), the pin being biased forward by the coil spring 320 and the front of the drive of the pin 319 in front. The limit is set by detent 321 operating in the slot of pin 319. Bolt 317 also has a spring biased loop (not shown because it is to the right of the longitudinal centerline when viewed from the front), which, in operation, removes ammunition from chamber 109 located in barrel extension 110 when in operation. Engage in the grooves of the ammunition to do so. There is a fixed lug 111 at the rear end of the barrel extension 110, between which the lug 322 engages with the lug 111 when the lug 322 of the bolt 317 is inserted and the bolt is rotated by the action of the cam pin 318 in the cam slot. So that it cannot be moved behind bolt 317. To ensure that the lug 322 of the bolt is correctly positioned between the lugs 111, the bolt is prevented from rotating by the catch 326 when it is withdrawn from the barrel extension 110. The clasp 326 has a V-shaped cross section and is biased forward by the spring 327 to engage between two of the top lugs 322. The clasp and spring 327 are located on the longitudinal axis of the gun and are movable within block 300 by an amount determined by slot 328 and lateral stop pin 329 of clasp 326.

A feed ramp 114 is provided at the lower inner edge of the barrel extension to facilitate entry of ammunition into chamber 109. The barrel extension 110, which is mounted in barrel 10 by the outer threaded groove 112 of the barrel, is connected to receiver 1 by block 113.

Gas system 9 with gas hole 900 inclined rearward is located at a distance along barrel 10. The gas hole 900 is connected to the gas cylinder 901, in which the piston 902 operates. The gas cylinder 901 is mounted between a conventional front clamp assembly 95 and the bush 904, which bush is arranged to align the gas cylinder 901 with the receiver 1. A compression spring 903 biases the piston 902 forward 95 toward the front latch assembly. It can be seen that the guide rod 303 extends forward of the barrel extension so that the end 304 is adjacent to the bush 904. When the bolt carrier assembly is in the foremost position the piston 902 is positioned to abut the front end bush 308 of the "P" shaped member 301.

In operation, in order to retract the bolt to prepare for firing, the bolt retract knob 601 is rotated counterclockwise as shown in FIG. 1 to release the retaining pin 604 and pull the handle backward to pull the bolt carrier assembly backward. To be pulled. Thus the assembly is held by the sheer 700 which engages the lug 325 and the various parts are in the position shown in FIG. Next, the bolt retraction handle 601 is returned to its original position and the retaining pin 604 is positioned within its corresponding recess so that the bar of the bolt retraction handle assembly 6

To fire the gun, the trigger 730 is pulled backwards against the force of the spring 732 as shown in FIGS. 3 and 4. Thus, cotton 735 rotates clockwise about rod 731 and consequently cotton 735 pushes actuator 771 upward so that 700 resists the compressive force of spring 703 as shown in FIGS. 2, 3 and 4 Tilt it counterclockwise. When the shear 700 is tilted, the lug 325 is released to release the bolt carrier assembly 3 and the assembly is moved forward by the tension generated by the main drive spring 307.

When the ammo is fired, a gas pressure is generated, and when the bullet passes through the gas hole 900, the gas under that pressure enters the gas hole 900 and expands in the cylinder 901. Because the piston 902 is driven backward by the pressure in the cylinder 901 and the piston 902 is arranged so that it is normally in contact with the bush 308 on the guide rod 303 (but in reality there is a small gap between the adjacent faces due to the tolerance), the bush 308 It is driven backwards to compress the main drive spring 307. As shown in FIG. 4, the running length of the piston 902 is much smaller than that of the bolt carrier assembly 3. The piston is stopped by the shoulder but the bolt carrier assembly continues to travel backward due to the energy and propulsion force stored in its mass during acceleration by the gas system. Since the gas pressure in the barrel is lost as soon as the bullet leaves the barrel, the location of the gas cylinder 901 and the amount of gas are carefully adjusted. The reverse movement of the bolt carrier assembly 3 and the cam slot causes the cam pin 318 to re-pass the cam slot and thereby rotate the bolt 322 to release the lock from the barrel extension lug 111. Continuous retraction of the bolt carrier causes bolt 317 to be withdrawn and the bolt's ammo hook to pull the ammo backwards to remove it from chamber 109. By moving further back of the bolt carrier assembly 3 the casing is aligned with the discharge slot 104 of the receiver right side.

The discharge pin 319 is ejected at the left side of the longitudinal axis of the ammo, and the ammunition hook retains the right side of the ammo, so that the casing is discharged along with the spring tension of the spring 320 that pushes the pin 319 forward. Eject out. Continuous reversal of the bolt carrier assembly opens the upper ammunition of the magazine and moves the lug 325 past the rear of the Shea 700, retracting the bolt again and passing the parts through the position shown in FIG. It is raised to the supply zone 103. If trigger 730 is still pulled, play

In the present invention, the bolt carrier assembly 3 is prevented only by the action of the main drive spring 307, and unlike the known gas-operated automatic gun, the bolt carrier assembly does not hit the rear receiver wall 100 in the present invention, namely M-16 and There is no need for the aforementioned shock absorbers as in the weapons to be compared, and there is no shock or direct impact of the shock absorber to improve the gun hit rate.

[Trigger mechanism]

The trigger mechanism shown in FIG. 5 includes a trigger assembly 72 mounted in receiver 1 and connected to the sheer 700 through an intermediate portion of the sheer actuator 77. A trigger guide 72 integral with the bulkhead 510 arranged to partially position the magazine (not shown) is mounted to the bottom of the receiver. Bolt carrier assembly 3 with block 300 in which bolt 317 is slidably and rotatably embedded has a P-shaped member 301, the upright portion of P being horizontally disposed on the block and welded to the block. Inside the wound portion of P is a spring-loaded recoil-proof weight (not shown) is arranged, and a main drive spring assembly (not shown) is arranged in the longitudinal direction adjacent to the uncoiled flat portion of P. . Through the P-shaped member 301 and the block 300, a pair of vertical sheer lugs 325 are mounted one at each side of the longitudinal axis of the gun (only one of them is shown in cross section in FIGS. 5 and 6), and the solid line A bolt carrier assembly, shown as shown, is shown in which lugs 325 are engaged with the upper tail portion of Shea 700.

Trigger assembly 73 has an arched trigger 730 rotatably mounted to rod 731, which trigger 730 is biased by a spring 732 disposed in a hole 736 where one side of the trigger is blocked. One end of the spring 732 acts against the cover of the hole 736 and the other end of the spring acts against the trigger spring retainer 733 which is fixed relative to receiver 1. The retainer 733 is located in the guide slot 734 of the trigger to cause the trigger to move arcuately; The trigger is after the top to activate the Shea 700 through the Shear Actuator 77.

The sear actuator is a rotating safety latch with a lever (not shown) on the outside of the receiver to rotate the hollow cylinder 770 extending between the sidewalls of the receiver. A circular cross section actuator 771 is slidably mounted across the axis of the cylinder. The actuator 771 is directed downwards towards the trigger tail 739 by a cantilever spring (not shown), and in the positions shown in FIGS. 5 and 6 the actuator 771 can transmit the movement of the trigger tail 739 to the lip of the shea 712. have.

Shear 700 is rotatably mounted on a transverse rod 701 that attaches the shea to shea buffer 705. The sheer lip 712 is biased downward towards the trigger tail 739 by compression springs 702 mounted in the sheath recess 703 and the stud 704 mounted to the lower receiver wall. The L-shaped protrusion 720 is located in front of the lip 712 with the base of L positioned away from the lip 712.

A brace member 745 having a tail 747 arranged to cooperate with the projection 746 abutting the trigger and the L-shaped projection 720 is mounted to the pivot rod 731 of the trigger. The protrusion 746 is biased towards the trigger by the spring 748.

The top of the sheer has a trailing portion 715 angled and wider than the front portion 716, the front and rear portions of which are separated by safety notches 717 that engage the sheer lugs. 5 and 6 show that the trailing portion 715 is positioned horizontally when the trigger is in the rest position and the front portion is angled slightly rearward with respect to the horizontal when the trigger is pulled (FIG. 6).

In FIG. 5, bolt carrier assembly 3 is shown in dashed line with lug 325 held by safety notch 717 and the range of forward movement of bolt 317 is shown. Thus, it will be appreciated that the bolt 317 is retained by the notch 717 when not held by the trailing portion of the shea so that the ammunition in the supply area 103 is not accidentally loaded.

In operation, the tail 747 of the brace member is positioned within the angular spacing defined by the L-shaped protrusion 720 when the bolt assembly 3 is held by the sheer at either of the shea's fumina notches 717. When trigger 730 is pulled backwards, the trigger is rotated counterclockwise (as seen in the figures) such that the upper rear surface 735 of the trigger pushes the actuator 771 towards the lip of the sheer and thus rotates the sheer clockwise. When the shea of the trigger rotates, the rug 325 is no longer held by the shea and the tail 747 is attached to the shea.

When the trigger is released, that is, when the trigger moves clockwise, the trigger rotates the brace member 745 clockwise, with the result that the tail 747 begins to move below the base of the L-shaped protrusion 720. As soon as the brace member 745 is rotated, the shea 700 rotates counterclockwise. By continued release of the trigger, the actuator 771 moves out of contact with the lip 712 and the sheer is held by the protrusion 720 supported by the tail 747. As the trigger continues to be released further, the brace member is rotated until the tail 747 no longer supports the protrusion 720 and the sheer is rotated to the actuator 771 by rotation of the member 745.

The time it takes for the sheer to disengage from the support by the tail 747 and to be supported by the actuator 771 is determined by the force exerted by the spring 702 and the mass of the shea 700, which is determined by the lug 302 notched by the lug 302 in the normal firing cycle. It is pre-determined to be longer than the time it takes to drive from the rear of the sheer past the vehicle. Thus the lug 325 of the bolt carrier assembly is not accidentally held by the notches 717 during the firing cycle.

In addition, the sheer is released quickly when the trigger is released, allowing the shear to rise into the lagttle passages in a fraction of the total firing cycle compared to conventional systems in which the sheer moves in line with the slow release of the trigger. do. Thus, a further advantage of the present invention is provided that the likelihood of complete engagement between the sheer and the lugs in the event of a crash stopping the bolt is high.

Claims (1)

Rotating the rotatable sheer with the notch provided to selectively engage the lug of the reciprocating bolt means and the notch formed to engage and cooperate with the lug when the lug does not engage the tail of the sheer and formed on the top surface of the sheer. A trigger coupled and pivotally mounted, and a member biased by a spring to cooperate with a portion of the sheer and move with the trigger, the trigger causing the sheer to rotate out of engagement with the lug in a first direction. The member is prevented from moving with the trigger by the sheer portion when pulled so that the sheath is further rotated in the first direction by the lug in contact with the sheer upper surface when the lug is displaced by the sheer so that the member is directed towards the trigger Move freely from below to the first direction until the trigger is released The gun is configured to prevent the shea from rotating in the opposite direction.

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