JPH06159992A - Percussion mechanism - Google Patents

Abstract

PURPOSE:To provide a mechanism wherein a bolt is composed so as to be simple and to be operable at high speed and a firing pin can also be advanced at high speed. CONSTITUTION:A bolt 4 has a firing pin 6 in a bolt body 5 for locking a barrel 2 at the front end side thereof, which pin can come in and out, and has a percussion lever 7 which is in contact with the rear end of the firing pin 6 and can be rocked forward. The firing pin 6 is advanced by the percussion lever 7 and ammunition W is percussed. In a chain-driving mechanism 9, an engaging catch 11 is pivotally joined to a pair of driving chain links 10 and a catch part 12 is provided so as to be vertically movable. The driving chain links 10 and the engaging catch 11 are guidably supported on a guide face 13, and the catch part 12 engages with the rear end of the bolt body 5 and advances the bolt body 5. First and second recessed parts 14, 15 are formed on the guide face 13, the catch part 12 is moved downward by the first recessed part 14 and the condition that the catch part 12 engages with the bolt body 5 is released. After that, the catch part 12 engages with the percussion lever 7 and rocks it forward. Furthermore, the catch part 12 is more moved downward by the second recessed part 15 and the condition that the catch part 12 engages with the percussion lever 7 is released.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breech bottom type machine gun. More specifically, the breech bolt is advanced by a chain drive mechanism.
The present invention relates to a firing mechanism for firing ammunition after closing the barrel.

[0002]

2. Description of the Related Art In a breech bottom type machine gun, the tail barrel is guided and supported by a tail cylinder so as to be able to advance and retreat with respect to the barrel, and at the time of firing operation, a chain drive mechanism advances the breech bolt to close the barrel and shoot ammunition. Those that have become known are conventionally known.

By the way, the breech in the above-mentioned machine gun is provided with a rear breech having a firing pin on the front breech that closes the barrel so that the breech can move forward and backward. When the rear end of the barrel is reached, the barrel is closed by the front breech, and by further advancing the rear breech later, the firing pin is projected from the front end of the front breech to shoot ammunition.

[0004]

However, regarding the above-mentioned conventional breech bolt, the front breech bolt and the rear breech bolt are integrally joined during forward movement, and the above-mentioned breech bolt is released after the front breech bolt abuts against the barrel and closes. However, the rear breech bolt must be further advanced over the front breech bolt, which complicates the structure. Also, because of this, it becomes heavy and requires a large amount of drive energy to move the breech bolt to the forward position,
It is difficult to drive at high speed. Further, not only the firing pin but also the rear breech hole needs to be advanced in order to make a shot, which makes it difficult to increase the forward speed of the firing pin.

The present invention has been made in order to solve the above-mentioned conventional problems, and its object is to provide a striking mechanism capable of advancing a firing pin at high speed while having a structure in which a play bottom is simple and capable of high-speed operation. To do.

[0006]

In order to solve the above-mentioned problems, in the present invention, a striking needle and a striking lever are provided on a breech bolt main body which closes the barrel at the front end side, and the striking lever is moved forward by the striking lever at the time of firing operation. By doing so, the play bottom is integrated. Further, an engaging claw is provided on a drive chain of a chain drive mechanism for advancing the breech bolt so that the claw portion can be vertically displaced, and a claw portion of the engaging claw is provided on a guide surface for guiding and supporting the cleats to engage with the breech bolt main body. First to displace the claws downward
By forming the recess and the second recess, the chain drive mechanism operates the percussion lever after the barrel is closed by the breech bolt main body.

That is, in the percussion mechanism of the present invention, the breech bolt main body that closes the barrel on the front end side is guided and supported by the tail tube so as to be able to move forward and backward with respect to the barrel, and the firing pin is provided on the breech bolt body so that it can project from and retract from its front end. Chain drive in which a play bottom provided with a firing lever for moving the firing needle forward and an engagement claw having a claw portion projecting upward in a drive chain moving forward are provided so that the claw portion can be vertically displaced. A mechanism and a guide surface for guiding and supporting the engaging claw so as to advance in a state where the claw portion is engaged with the free bottom main body, the first surface displacing the claw portion of the engaging claw downward on the guide surface. A concave portion and a second concave portion are formed, and the first concave portion releases the engagement of the claw portion of the engaging claw with the play bottom body immediately before the play bottom body reaches the advance position, and stops the play bottom body at the advance position. Shaped to engage the lower end of the percussion lever in the Is, the second recess is summer so as to release the engagement between the lower end of the percussion lever displaced claws further down the engaging claw.

[0008]

Embodiments of the present invention will be described with reference to the drawings. The free-bottom type machine gun 1 shown in the figure is provided with a free-bottom 4 having a free-bottom body 5 that is guided and supported above the inside of the transition piece 3 so as to be able to move forward and backward with respect to the barrel 2. The free-bottom 4 is moved forward by a chain drive mechanism 9. After the barrel 2 is closed, the ammunition W is shot out. The front end side of the breech bolt main body 5 abuts against the rear end of the barrel 2 and is closed, and is held in a closed state by a closing lock 16 and a closing lock seat 17 as described later. A firing pin 6 and a firing lever 7 are provided in the breech bolt body 5 for firing the ammunition W. The striker needle 6 can be retracted from the front end of the play bottom body 5, is elastically biased rearward by a spring 8 and is held in the retracted state, and is projected from the front end of the play bottom body 5 by the operation of a percussion lever 7. The percussion lever 7 is swingably provided forward so as to come into contact with the rear end of the percussion needle 6, and the lower end of the percussion lever 7 has a bottom portion of the play bottom body 5.
Is provided so as to project from the lower surface of the chain, and the chain drive mechanism 9 is provided after the breech bolt main body 5 reaches the forward position as will be described later.
Are engaged to operate.

The chain drive mechanism 9 includes a pair of drive chains 10 that move forward and a claw 12 that projects upward from the rear.
The engaging claw 11 is pivotally attached to the drive chain 10 on the front side thereof so that the claw portion 12 is vertically displaced. The drive chain 10 and the engaging claw 11 are
The tail surface of the tail cylinder 3 is guided and supported by a guide surface 13 formed on the bottom of the tail cylinder 3, and the claw portion 12 of the engaging claw abuts and engages with the rear end surface of the breech bolt main body 5, with the front end of the breech bolt main body 5 rearwardly of the barrel 2. It is designed to move to the forward position where it abuts the end. Guide surface 1
3 is a first concave portion 14 and a second concave portion 14 which displace the engaging claw 11 downward.
The first recess 14 is provided with a recess 15, and the rear portion of the engaging claw 11 falls immediately before the breech bolt main body 5 reaches the forward movement position.
The claw portion 12 is displaced downward to release the engagement with the free-bottom body 5 and engage with the lower end of the percussion lever 7 when the free-bottom body 5 is stopped at the forward position. The second recessed portion 15 is dropped after the claw portion 12 of the engaging claw is engaged with the lower end of the percussion lever 7, and the pawl portion 12 is displaced further downward to release the engagement with the lower end of the percussion lever 7. It has become.

The closing lock 16 is located inside the play bottom main body 5 as shown in FIGS. 2 and 3 while the play bottom main body 5 is moving forward, and is not shown when the play bottom main body 5 reaches the forward moving position. 6 and is engaged with the closing lock seat 17 formed inside the transition piece 3 as shown in FIG. 6 to fix the breech bolt main body 5 in the forward position to maintain the closed state. ing. Further, the closing lock 16 engages with the rear portion of the firing pin 6 until it is swung outward from the breech bolt main body 5, and holds the firing pin 6 so as not to move forward. The closing lock mechanism includes a locking operation chain having a cam member that swings the closing lock 16 outward when the breech bolt main body 5 reaches the forward position, and the closing lock 16 is moved to the breech hole before the withdrawal bottom body 5 is retracted. It may be provided with a lock release chain having a cam member for returning so as to be housed in the main body 5.

This embodiment is constructed as described above,
The operation will be described below. At the time of firing operation, as shown in FIG. 1, the engaging claw 11 of the chain drive mechanism 9 is engaged with the guide surface 13
The claw portion 12 abuts on and engages with the rear end surface of the breech bolt main body 5, and moves the drive chain 10 to advance the breech bolt main body 5. When the front end of the breech bolt main body 5 reaches just before contacting the rear end of the barrel 2, the engaging claw 11 falls into the first recess 14 of the guide surface as shown in FIG.
Is displaced downward and is disengaged from the play bottom main body 5. Then, the breech bolt main body 5 advances due to inertia, and its front end contacts the rear end of the barrel 2. At the same time, the closing lock 16 is swung outward by a closing lock drive mechanism (not shown) and engages with the closing lock seat 17, holding the breech bolt main body 5 in the forward position in a stopped state and closing the barrel 2. To do.

On the other hand, after the engaging claw 11 has dropped into the first concave portion 14, it advances along the first concave portion 14 in the state shown by the two-dot chain line in FIG. 5, and the claw portion 12 engages with the lower end of the percussion lever 7. Then, the percussion lever 7 is swung forward. Then, when the state shown by the solid line in FIG. 5 is reached, the rear part of the engaging claw 11 falls into the second concave portion 15, the claw part 12 is further displaced downward, and the percussion lever 7 is released.
To disengage from. When the percussion lever 7 swings forward, the closing lock 16 is swung outward and is disengaged from the rear part of the firing pin 6, so that the percussion lever 7 swings the firing pin 6 against the elastic force of the spring 8. To project from the front end of the breech bolt main body 5 and shoot the ammunition W. At this time, since the rear part of the firing pin 6 projects to the storage position of the closing lock 16 as shown in FIG. 6, even if the closing lock 16 tries to return to the storage position due to the impact of a strike, it is blocked by the firing pin 6.
Therefore, the closing lock 16 is engaged with the closing lock seat 17 at least until the end of the firing, and the closed state by the breech bolt main body 5 is maintained.

After the strike, the strike needle 6 and the strike lever 7 are returned to the position shown in FIG. 1 by the spring 8, so that the closing lock 16 is not disturbed by the strike needle 6 as described above and is in the storage position. It is ready to return to. Then, a return operation by a closing lock drive mechanism (not shown),
For example, the lock release chain is actuated to return to the storage position shown in FIG. 2, and the engagement with the closing lock seat 17 is released. At the same time as the engagement between the closing lock 16 and the closing lock seat 17 is released, the breech bolt 4 returns to the position shown in FIG. 1 due to the recoil of the percussion, and the preparation for loading the next bullet is completed.

According to this embodiment, the closing lock 16 is moved until the breech bolt body 5 reaches the forward position and the closing lock 16 engages with the closing lock seat 17 to hold the breech bolt body 5 in a stopped state.
Prevents the striking needle 6 from advancing, and the chain drive mechanism 9 activates the percussion lever 7 after the breech bolt main body 5 reaches the forward movement position. It is possible to prevent accidental firing. Therefore, it is possible to advance the firing pin 6 only after the breech bolt main body 5 has closed the barrel 2 reliably, and to fire safely and reliably.

The present invention is not limited to this embodiment. For example, the chain drive mechanism has the engaging claws 11.
The claw portion 12 may be provided on the drive chain 10 so that it can be displaced vertically. A separate chain drive mechanism for returning may be provided in order to return the play bottom 4 after the completion of firing.

[0016]

According to the present invention, since the striking needle and the striking lever are provided in the main body of the breech bolt, and the striking lever moves the striking needle forward to strike, the structure of the breech bolt is simpler than the conventional structure. It became possible to Since the member that moves for firing is lightweight only with the firing pin and the firing lever, the firing pin can be advanced at high speed with a small driving force, a large impact force can be applied to the ammunition, and the firing can be performed reliably. It has become possible.

Further, an engaging claw is provided on the drive chain of the chain drive mechanism such that the claw portion is vertically displaceable, the driving chain and the engaging claw are guided and supported by the guide surface, and the engaging claw is downwardly moved on the guide surface. By forming the first concave portion and the second concave portion which are displaced to, the chain drive mechanism for advancing the breech bolt main body can also be used for the operation of the percussion lever.
As a result, the drive mechanism of the percussion lever can be omitted, and the breech bolt can have a simpler structure.

[Brief description of drawings]

FIG. 1 is a conceptual vertical cross-sectional view of an embodiment, showing a state in which a breech bolt is moving forward.

FIG. 2 is a sectional view taken along the line AA of FIG.

3 is a sectional view taken along the line BB of FIG.

4 is a cross-sectional view taken along the line CC of FIG.

FIG. 5 is a conceptual vertical sectional view of the embodiment, showing a state in which the breech bolt has reached the forward position.

6 is a cross-sectional view taken along the line DD of FIG.

[Explanation of symbols]

 2 gun barrel 3 tail cylinder 4 breech bottom 5 breech bottom body 6 firing pin 7 firing lever 8 spring 9 chain drive mechanism 10 drive chain 11 engaging claw 12 engaging claw claw 13 guide surface 14 first recess 15 second recess 16 closing lock 17 Closed Lock W Ammunition

Claims (1)

[Claims] 1. A breech bolt main body that closes the barrel at the front end side is guided and supported by a tail cylinder so as to be able to move forward and backward with respect to the barrel, and a firing pin is provided on the breech bolt body so that it can be retracted and retracted from the front end so that this firing pin can be moved forward. A play bottom provided with a percussion lever, a chain drive mechanism in which an engaging claw having a claw portion projecting upward in a drive chain moving forward is provided so that the claw portion can be displaced up and down, and an engaging claw And a guide surface for guiding and supporting the claw portion so as to move forward in a state of being engaged with the breech bolt main body,
A first concave portion and a second concave portion for displacing the claw portion of the engaging claw downward are formed on the guide surface, and the claw portion of the engaging claw is formed in the first concave portion immediately before the play bottom body reaches the forward position. Is formed so as to be engaged with the lower end of the percussion lever when the breech bolt main body is stopped in the forward movement position.
The percussion mechanism is characterized in that the claw portion of the engaging pawl is further displaced downward to release the engagement with the lower end of the percussion lever.