A straight-pull bolt mechanism of a repeating rifle and a repeating rifle

Abstract

The straight-pull bolt mechanism of a repeating rifle has a bolt (3) which is mounted with the possibility of sliding movement in the guide grooves (38) of the bolt (3) receiver (1). The breech block (4) is mounted with the possibility of sliding movement above the bolt (3), with the rear part of the breech block (4) being mounted in the guide grooves (38) of the bolt (3) receiver (1). The front part of the breech block (4) is movably connected to the upper part of the bolt (3); furthermore the front part of the breech block (4) is provided with at least one locking lug (24) for locking the breech block (4) in the locked position of the bolt (3); and furthermore the front part of the breech block (4) is provided with a puller (7) extensible in the unlocked position of the bolt (3) over the front edge of the bolt (3). The breech lock (5) is provided with a cross pin (26), the ends of which engage with the front brackets (25) arranged oppositely in the breech block (4). The repeating rifle has a groove (39) above the chamber (34) for the locking lug (24) of the breech block (4).

Description

Field of the Invention

[0001] The present invention relates to a firearm, in particular to a straight-pull bolt mechanism of a repeating rifle, in particular a repeating shotgun. In addition, it relates to a repeating rifle with this straight-pull bolt mechanism, in particular a repeating shotgun.Background of the Invention

[0002] Repeating rifles, specifically repeating shotguns, have in the vast majority of cases a bolt mechanism comprising a straight-pull bolt that is both axially movable and rotatable about its axis. The bolt thus performs a combined sliding-rotary movement when locking and unlocking against the firing mechanism, while to lock the rotary component of the movement, the bolt is provided with projections that move in recesses in the shape of a multi-pass helix, which is formed in the receiver, or along curved surfaces. The entire sliding-rotary movement of the bolt is then controlled by the bolt handle, which is pivotally mounted transversely to the axis of the firearm within the control part, which is sliding-movable within the chamber sleeve, as described, for example, in document EP 0 784 194 B1.

[0003] A similar bolt mechanism is described in document DE 10 2016 120 981 A1, where the bolt mechanism chamber contains, in addition to the bolt, an axially movable control part. Connected to this control part is the bolt handle, which is mounted pivotally about an axis running eccentrically with relation to the longitudinal axis of the bolt chamber.

[0004] Similar solutions for straight-pull bolt action mechanisms are described, for example, in documents DE 100 09 616 C2, US 2017 / 0016688 A1, EP 3 623 740, etc.

[0005] The disadvantage of the sliding-rotary bolt solutions described above is that to achieve the change between the cocked bolt position and the locked bolt position, the bolt handle needs to be operated in both a straight and rotary motion, the trajectory of this motion is more complex in terms of manipulation and the shooter must manipulate the bolt handle for a longer period of time. In doing so, it is desirable, and it is also an object of the present invention, to reduce the time between shots as much as possible, i.e. to simplify and speed up the bolt handle step as much as possible and to reduce as much as possible the time required for the entire cycle of ejecting the cartridge case after firing with the bolt moved to the rear cocked position and loading a new cartridge into the chamber with the bolt moved to the front locked position ready for firing. Another disadvantage is the relatively stiff operation of the bolt mechanism, which leads to the fact that considerable physical strength of the shooter is required to perform the above described cycle. In terms of safety, it is disadvantageous that the bolt mechanism is open towards the rear, and in the event of a malfunction, the bolt may fly backwards when fired and cause injury or death to the shooter.

[0006] The elimination of the above described disadvantages is the aim of the present invention, for which, however, the closest and initial background of the invention is another bolt mechanism, specifically the bolt mechanism of automatic, or semi-automatic self-loading firearms, namely the Type 58 Assault Rifle, also referred to as the "Type 58 Submachine Gun". This assault rifle was massively used in the Czechoslovak army and in the armies of other countries of the so-called Eastern Bloc, especially before 1990.

[0007] The straight-pull bolt mechanism of the Type 58 Assault Rifle has a bolt that, together with the bolt handle, performs only a straight motion, and thus takes a very short time to cock. The bolt moves gently thanks to a simple sliding motion with large component clearances, so that moving the bolt handle with the bolt requires very little physical strength. The bolt mechanism is damage-resistant and works reliably even in adverse conditions.

[0008] The bolt mechanism of the Type 58 Assault Rifle consists of the receiver, the bolt, the breech block with bolt handle on the right side, and the breech lock and striker. The bolt mechanism is connected to a gas piston controlling its movement and loading. The breech block is guided along its entire length by sliding motion in the grooves of the receiver. The bolt is suspended below the breech block and is mounted movably in the internal grooves on the sides of the breech block. The breech lock which closes the bolt in the locked position is "U" shaped, is movably mounted on the bolt, and has an inclined surface which is engaged by a wedge-shaped tongue on the underside of the breech block which raises the breech lock to the raised position when the breech block is moved to the rear and the bolt is unlocked. On the contrary, when locking the bolt, the breech lock drops down and is pressed down by the cross beam on the underside of the breech block as the breech block moves forward. The ends of both breech lock arms fit into the locking recesses in the bottom of the receiver. In the upper part there is an ejector used to eject the empty cartridge case after firing. On the right side of the ejector is the slide stop, which holds the bolt in the rear position after the last cartridge has been fired (the so-called "bolt hold open"). On the left side of the ejector from below, the magazine catch is fixed on the pin. The bolt mechanism ejects cartridges from the magazine and slides them into the chamber, locks the chamber when fired, ignites the primer of the cartridge, and extracts and ejects the fired cartridge case. A recoil device is used to return the bolt to the foremost position.

[0009] The firearm fires from the front locked bolt position. The function of automatic firing with self-loading is based on the principle of the pressure of powder gases, diverted after firing from the inside of the barrel through the inclined gas channel into the gas cylinder, located above the barrel. This gas cylinder is an essential part of the design of the Type 58 Assault Rifle. In the gas cylinder, the gases act on the piston, the piston rod of which rests on the breech block with its rear end and thus transmits the impulse of the powder gases thereto. The breech block starts to move to the rear, after its movement by 12 mm the breech lock, lifted by the breech block, goes upwards outside the recess of the receiver and the bolt is thus unlocked. The required trajectory creates a delay during which the bullet leaves the barrel, and the pressure of powder gases drops to a level safe for bolt unlocking. The unlocked bolt moves to the rear while the cartridge case is extracted out of the chamber and ejected. The cartridge is extracted by the extractor located on the breech block and the fixed ejector in the gun case (behind the magazine well) ejects it right side up. The piston and piston rod are returned to the forward position by a separate piston spring. The entire bolt is returned to the forward position by a recoil spring located above the main spring. The breech block feeds a new cartridge from the cartridge case and slides it into the chamber. The bolt closes the barrel and the breech block, continuing its forward motion, presses the breech lock into a recess in the receiver. This closes and locks the barrel.

[0010] The design of the bolt mechanism of the Type 58 Assault Rifle is so dependent on the gas piston and the force conditions induced by the pressure of powder gases that the use of this bolt mechanism for conventional repeating shotguns without a gas piston is not possible. It has been experimentally verified that without the pressure of post-firing gases, this bolt mechanism cannot be opened from the locked position of the bolt after firing by simply pulling the bolt handle by hand, so it cannot be used for a repeating shotgun.

[0011] The object of the present invention is to provide such a straight-pull bolt mechanism for a repeating shotgun which would take advantages of the bolt mechanism of the Type 58 Assault Rifle, in particular its straight sliding motion and its easy and reliable operation, and at the same time such a bolt mechanism would be suitable for use without a gas cylinder, with control of the entire movement cycle by means of the bolt handle and recoil springs only.Summary of the Invention

[0012] The above object is achieved by providing a straight-pull bolt mechanism according to the present invention. The invention is based on the known straight-pull bolt mechanism of a repeating rifle, which includes a receiver with guide grooves, locking recesses for engaging the breech lock, a magazine well and a trigger guard well, and further including a bolt with a breech lock and a striker, a breech block with a blot handle, an extractor, an ejector and at least one recoil spring. In this well-known bolt mechanism, the breech block is mounted along its entire length in the guide grooves of the receiver. The summary of the present invention is that, rather than the breech block, the bolt is mounted with the possibility of sliding movement in the guide grooves of the receiver, and that the breech block is mounted with the possibility of sliding movement above the bolt. The rear part of the breech block is placed in the guide grooves of the receiver and the front part of the breech block is movably connected to the upper part of the bolt. Further, the front part of the breech block is provided with at least one locking lug engaging in the locked position of the bolt in a horizontal groove formed in the front end of the receiver. In addition, the front part of the breech block is provided with a puller that can be extended in the unlocked position of the bolt over the front edge of the bolt to push the bolt to the rear against the direction of the shot. The breech lock is provided with a cross pin, the ends of which fit into the front brackets arranged opposite in the breech block and pointing diagonally upwards towards the front part of the breech block. The above design features, in combination, result in the bolt and breech block being dimensionally combined to fit into the receiver of a conventional repeating shotgun, particularly with respect to the required low installation height, and to achieve easy operation of the entire bolt mechanism with minimal physical effort. The use of the puller initiates the initial phase of recoil after firing and allows the initial ejection of the cartridge case from the chamber.

[0013] The locked position of the bolt or breech block refers to the position in which the bolt or breech block is in the forward position towards the barrel. The unlocked position of the bolt or breech block is the position in which the bolt or breech block is in the rearward position from the barrel.

[0014] In a preferred embodiment of the invention, the front part of the breech block for movable connection to the upper part of the bolt is provided with a connecting pin, and the front part of the bolt is provided with a guide bracket, where the connecting pin is guided in the guide bracket with the possibility of sliding movement of the breech block relative to the bolt. The guide allows for relative sliding movement of the bolt and breech block within the range defined by the length of the guide bracket.

[0015] In another preferred embodiment of the invention, the front part of the breech block is provided with two parallel locking lugs. Two locking lugs lock the breech block reliably in the locked position when fired.

[0016] In another preferred embodiment of the invention, the puller is in the form of a longitudinal body, the front end of which is extendable over the front edge of the bolt and which extends into the rear part of the breech block, where the rear end thereof engages with one of the arms of the two-arm rotary lever, with the ends of the arms of the rotary lever engaging with two longitudinal rear brackets arranged oppositely in the sides of the breech block, with one of the rear brackets having a greater length than the other rear bracket. When the breech block moves backwards, the rotary lever rotates, and its arm moves the puller forward in front of the bolt edge.

[0017] In another preferred embodiment of the invention, the receiver is closed at the rear, so that it is not possible for the bolt or breech block to fly backwards towards the shooter during firing due to some malfunction.

[0018] In a further preferred embodiment of the invention, the receiver is provided with a removable upper cover with a weaver bar at the top, attached to the receiver by means of a front screw and a rear screw.

[0019] In terms of safety, the preferred embodiment is when the striker is split and consists of a front striker and a rear striker, whereby in the unlocked position of the bolt the rear striker does not engage the front striker and, on the contrary, in the locked position of the bolt the rear striker engages the front striker.

[0020] In another preferred embodiment of the invention, the bolt handle is coupled to the breech block by means of a lever mechanism comprising a front lever and a rear lever, where the breech block further comprises a vertical lever arranged to engage with the end of the rear lever such that when the bolt handle is moved to the rear, the lower end of the vertical lever moves below the lower edge of the breech block.

[0021] It is further preferred in terms of safety that a blocking lock is arranged in the lower part of the receiver, the front end of which engages the breech block in the locked position of the breech block and the rear end of which engages the lower end of the vertical lever.

[0022] In addition, the object of the invention includes a repeating rifle, in particular a shotgun which is provided with a straight-pull bolt mechanism according to the invention, and the rear end of the barrel is provided with at least one horizontal groove for a locking lug of the breech block in the area above the chamber.

[0023] The straight-pull bolt mechanism and the repeating rifle with this straight-pull bolt mechanism eliminate all the disadvantages of the solutions known from the background of the invention.Explanation of drawings

[0024] The present invention will be described in more detail by means of the accompanying figures where: Fig. 1shows a section of a repeating shotgun with a straight-pull bolt mechanism according to the present invention, in the cocked position with the bolt unlocked, Fig. 2shows a section of a repeating shotgun with a straight-pull bolt mechanism according to the present invention, in the position with the bolt locked, Fig. 3shows a detailed section of a straight-pull bolt mechanism according to the present invention, in the cocked position with the bolt unlocked, Fig. 4shows a detailed section of a straight-pull bolt mechanism according to the present invention, in the position with the bolt locked, Fig. 5shows a section of the breech block and bolt assembly with the puller in the locked position of the bolt, Fig. 6shows a section of the breech block and bolt assembly with the puller when moving to the unlocked position of the bolt, Fig. 7shows a plan view of the breech block and bolt assembly with the puller in the locked position of the bolt, Fig. 8shows a plan view of the breech block and bolt assembly with the puller when moving to the unlocked position of the bolt, Fig. 9shows a view of the front end of the bolt with the puller, Fig. 10shows a plan view of the receiver with breech block and bolt lever, Fig. 11shows a schematic view of the bolt handle, vertical lever and locking lever of the breech block in the locked position of the breech block, Fig. 12shows a schematic view of the bolt handle, vertical lever and locking lever of the breech block in the unlocked position of the breech block. Examples of the invention embodiments

[0025] The repeating rifle, in a particular embodiment of the repeating shotgun, includes a straight-pull bolt mechanism comprising a receiver 1 of the bolt 3 to which a barrel 2 comprising a chamber 34, a guard 45 with a guard plate 46 and an upper receiver cover 31 with a weaver bar is removably attached. In the lower part of the receiver 1 of the bolt 3 there are two wells, the front one for inserting the magazine 36 with pressure plate 32, the rear one for the trigger mechanism. The upper part of the receiver 1 of the bolt 3 includes guide grooves 38 for guiding the bolt 3 and the rear part of the breech block 4, a locking recess 47 for engaging the ends of the breech lock 5, a vertical groove for the plate with guide pins 43 of the recoil springs 42 of the breech block 4, and a groove in the rear end for locating the safety lock body. The bolt 3 is guided along its entire length in the guide grooves 38 of the receiver 1 of the bolt 3. The bolt 3 carries other components, namely, a breech lock 5 in a swinging arrangement at the rear part of the bolt 3, a striker with a recoil spring split into a front striker 10 and a rear striker 11, an ejector 8 with a spring, and a puller 7 operated by a horizontally mounted rotary lever 9. The bolt 3 engages from above the breech block 4. There are two locking lugs 24 on the front end of the breech block 4, which fit into a horizontal groove 39 above the chamber 34 of the barrel 2 and prevent the front part of the breech block 4 from lifting during firing. In the side walls of breech block 4 there are two pairs of opposite brackets 25, 40. A pair of front brackets 25 control the lifting of the breech lock 5 via a cross pin 26 located in the body of the breech lock 5. These front brackets 25, in conjunction with the cross pin 26, lift the breech lock 5, or move it to the locked position of the bolt 3, behind the locking recess 47 of the receiver 1 of the bolt 3. A pair of rear brackets 40, when the breech block 4 is moved to the front and to the rear, control the horizontal rotary lever 9, which controls the movement of the puller 7 from the left side. In the rear part of the breech block 4, two levers are mounted in a horizontal groove, specifically the front lever 13 and the rear lever 14, both operated by the handle 12 of the bolt 3. Through levers 13 and 14 run vertical pins about which levers 13 and 14 rotate. The front lever 13 is an auxiliary lever, the rear lever 14 with its left end engages the upper end of the vertical swing lever 15 which folds the blocking lock 16 of the breech block 4. There are two holes 28 in the upper part of the breech block 4 for the recoil springs 42 of the breech block 4. A rear striker 11 is fitted in the lower part of the breech block 4, which, in the unlocked position of the breech block 4, does not allow it to engage the front striker 10 and thus makes it impossible to fire.

[0026] This safety feature of the split striker is that until the front end of the breech block 4 reaches the rear part of the bolt 3, the front end of the rear striker 11 will not reach the rear end of the front striker 10 when the firing hammer 17 strikes. A gap of 1 mm or more is sufficient to prevent the primer from igniting in the bottom of the cartridge case 35. That is, if the breech block 4 does not complete the entire dead run of 9 mm, and the firing hammer 17 still strikes the rear striker 11, the primer in the bottom of the cartridge case 35 cannot be ignited.

[0027] The straight-pull bolt mechanism is operated by grasping the handle 12 of the bolt 3 by hand and pulling it to the rear. This causes the front lever 13 and the rear lever 14 of the handle 12 of the bolt 3 to rotate about the vertical pins. The end of the rear lever 14 engages the upper end of the vertical lever 15, the lower end of the vertical lever 15 moves under the bottom of the breech block 4 and pushes downwards the front end of the blocking lock 16. This will unlock the breech block 4 to the unlocked position. The breech block 4 further moves to the rear, while the two locking lugs 24 of the breech block 4 slide out of the horizontal groove 39 above the chamber 34. By sliding the breech block 4 after lowering the blocking lock 16, the so-called dead run of the breech block 4 takes place in the length of 9 mm. This also causes the front striker 10 to move away from the rear striker 11. By a further movement of the breech block 4 to the rear, the two front brackets 25 located on its sides lift the breech lock 5 by means of the cross pin 26 of the breech lock 5. The front brackets 25 operate the breech lock 5 with the use of the ends of this cross pin 26. When the breech block 4 has been fully moved along the bolt 3 in the length of 15 mm, the breech locks 5 is fully opened and the bolt 3 is unlocked. At this point, the pair of rear brackets 40 on the sides of the breech block 4 engage the right end of the horizontal rotary lever 9 and at the same time the left end of this rotary lever 9 pushes against the rear end of the body of the puller 7 in counter-motion and moves it to the front by 2 mm. This releases the ejected cartridge case 35 from the chamber 34. At the same time, the extractor 6, whose hook is caught in the groove of the cartridge case 35, begins to extract the cartridge case 35 from the chamber 34. The whole system, i.e. breech block 4 with bolt 3 and breech lock 5, moves to the rear. When the cartridge case 35 is removed from the chamber 34, the ejector 8 ejects the cartridge case through the ejection port 48. Further, when the system moves to the rear, the trigger mechanism is tensioned. The lowering of the blocking lock 16 of the breech block 4 causes the two recoil springs 42 to be compressed and gradually inserted, together with the guide pins 43, into the holes 22 in the breech block 4.

[0028] As the system moves forward, the recoil springs 42 push the moving parts forward. This causes the cartridge 35 to be ejected from the magazine 36, then loaded into the chamber 34 and the entire firearm system to be locked. In the first phase, the front end of the bolt 3 strikes the bottom of the cartridge 35 and begins to eject it from the magazine 36. In the second phase, the bolt 3 loads the cartridge 35 into the chamber 34 in the barrel 2. In doing so, the ejector 8 is inserted into the front end of the bolt 3, and the hook of the extractor 6 is hooked into the groove in the cartridge case 35. The system is not yet locked.

[0029] The breech block 4 is then moved. The front bracket 25 of the breech block 4 for operating the breech lock 5 lowers the breech lock 5 by means of the cross pin 26 of the breech lock 5 into the locking recess 47 of the receiver 1 of the bolt 3. In this position, the breech block 4 is only 9 mm from the front end of the barrel 2 and must overcome the so-called dead run of the breech block 4. As the breech block 4 continues to move forward, the two locking lugs 24 of the breech block 4 are engaged in the horizontal groove 39 in the front end of the receiver 1 of the bolt 3 above the chamber 34. Further, the connecting pin 22 of the bolt 3 and the breech block 4 reaches the forward position of the slot guide 21 of the bolt 3. Further, the rear bracket 40 of the breech block 4 for the rotary lever 9 of the puller 7 rotates the rotary lever 9 of the puller 7 so that the right end of this rotary lever 9 moves to the front, and the left end of this rotary lever 9 moves to the rear. This inserts the front end of the puller 7 into the bolt 3. Finally, the front end of the blocking lock 16 is raised below the bottom of the breech block 4 and the end of the vertical lever 15 is inserted into the bottom of the breech block 4. This leaves the entire system locked and ready to fire.Industrial applicability

[0030] The present invention can be used for firearms, in particular as a straight-pull bolt mechanism for a repeating rifle, in particular a repeating shotgun.List of reference numerals in the drawings

[0031] 1Receiver 2Barrel 3Bolt 4Breech block 5Breech lock 6Extractor 7Puller 8Ejector 9Rotary lever of the puller 10Front striker 11Rear striker 12Bolt handle 13Front lever of the bolt handle 14Rear lever of the bolt handle 15Swing lever 16Blocking lock of the breech block 17Firing hammer 18Trigger lever 19Trigger 21Bolt slot guide 22Bolt and breech block connecting pin 23Locking surface of the breech lock 24Locking lug of the breech block 25Front bracket of the breech block for operating the breech lock 26Cross pin of the breech lock 27Hole for recoil spring guide pin 28Recoil spring hole 29Blocking lock pin 30Spring for lifting the blocking lock of the breech block 31Upper receiver cover with weaver bar 32Front screw of the upper receiver cover 33Rear screw of the upper receiver cover 34Chamber 35Cartridge case, cartridge 36Magazine 37Pressure plate of the magazine 38Receiver guide groove for bolt and breech block guide 39Groove for the locking lug of the breech block 40Rear bracket of the breech block for rotary lever of the puller 42Recoil spring 43Recoil spring guide pin 44Plate for attaching the guide pin 45Guard 47Locking recess in the receiver 48Ejection port

Claims

1. A straight-pull bolt mechanism of a repeating rifle comprising a receiver (1) of a bolt (3) with guide grooves (38), locking recesses (47) for engaging the breech lock (5), a magazine well (36) and a trigger guard well, and further comprising a bolt (3) with a breech lock (5) and a striker, a breech block (4) with a bolt handle (12) of the bolt (3), a extractor (6), an ejector (8) and at least one recoil spring (42), characterized in that the bolt (3) is mounted with the possibility of sliding movement in the guide grooves (38) of the receiver (1) of the bolt (3), the breech block (4) is mounted with the possibility of sliding movement above the bolt (3), with the rear part of the breech block (4) being mounted in the guide grooves (38) of the receiver (1) of the bolt (3), and the front part of the breech block (4) being movably connected to the upper part of the bolt (3); furthermore, the front part of the breech block (4) is provided with at least one locking lug (24) for locking the breech block (4) in the locked position of the bolt (3) and the front end of the receiver (1) of the bolt (3) is provided with at least one groove (39) for engaging the locking lug (24) of the breech block (4); and further, the front part of the breech block (4) is provided with a puller (7) extendable in the unlocked position of the bolt (3) over the front edge of the bolt (3) to push the bolt (3) to the rear against the direction of firing, and that the breech lock (5) is provided with a cross pin (26), the ends of which engage with the front brackets (25) arranged oppositely in the breech block (4) and pointing diagonally upwards towards the front part of the breech block (4).

2. The straight-pull bolt mechanism according to claim 1, characterized in that the front part of the breech block (4) is provided with a connecting pin (22) for movable connection to the upper part of the breech block (4), and the front part of the bolt (3) is provided with a slot guide (21), with the connecting pin (22) being guided in the slot guide (21) with the possibility of sliding movement of the breech block (4) in relation to the bolt (3).

3. The straight-pull bolt mechanism according to claim 1 or 2, characterized in that the front part of the breech block (4) is provided with two parallel locking lugs (24).

4. The straight-pull bolt mechanism according to any of claims 1 to 3, characterized in that the puller (7) is in the form of a longitudinal body, the front end of which is extendable over the front edge of the bolt (3) and which extends into the rear part of the breech block (4), where its rear end engages with one of the arms of the two-arm rotary lever (9), with the ends of the arms of the rotary lever (9) engaging two longitudinal rear brackets (40) arranged oppositely in the sides of the breech block (4), with one of the rear brackets (40) having a greater length than the other rear bracket (40).

5. The straight-pull bolt mechanism according to any of claims 1 to 4, characterized in that the receiver (1) of the bolt (3) is closed at the rear.

6. The straight-pull bolt mechanism according to any of claims 1 to 5, characterized in that the receiver (1) of the bolt (3) is provided in the upper part with a removable upper cover (31) with a weaver bar, fixed to the receiver (1) of the bolt (3) by means of a front screw (32) and a rear screw (33).

7. The straight-pull bolt mechanism according to any of claims 1 to 6, characterized in that the striker is split and consists of a front striker (10) and a rear striker (11), whereby in the unlocked position of the bolt (3) the rear striker (11) does not engage the front striker (10) and, on the contrary, in the locked position of the bolt (3) the rear striker (11) engages the front striker (10).

8. The straight-pull bolt mechanism according to any of claims 1 to 7, characterized in that the handle (12) of the bolt (3) is connected to the breech block (4) by means of a lever mechanism comprising a front lever (13) and a rear lever (14), where the breech block (4) further comprises a vertical lever (15) arranged to engage with the end of the rear lever (14) such that when the handle (12) of the bolt (3) is moved to the rear, the lower end of the vertical lever (15) moves below the lower edge of the breech block (4).

9. The straight-pull bolt mechanism according to claim 8, characterized in that the blocking lock (16) is arranged in the lower part of the receiver (1) of the bolt (3), the front end of which engages the breech block (4) in the locked position of the breech block (4) and the rear end of which engages the lower end of the vertical lever (15).

10. A repeating rifle, in particular a shotgun, characterized in that it is provided with a straight-pull bolt mechanism of any of claims 1 to 9, and that the groove (39) for the locking lug (24) of the breech block (4) is arranged in the front end of the receiver (1) of the bolt (3) in the area above the chamber (34) of the barrel (2).

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