JPH048718B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a bolt and a rear seat body for moving the bolt. This invention relates to a locking device for a bolt in a small firearm such as an automatic loading gun, which opens and closes the bolt.

Conventionally, various types of closing mechanisms have been used for the chamber entrance in automatic loading guns, but the rear seat body (rear bolt, bolt carrier, etc.) is the most reliable because of its reliable operation and high reliability. (There are some differences in the configuration depending on the gun.) As the bolt is reseated, the bolt held is rotated by a predetermined angle in the forward or reverse direction, and the fixed lug on the chamber side and the rotation on the bolt side are rotated. The so-called rotary lock system, in which the chamber entrance is opened and closed by engaging and disengaging lugs, is most widely used. However, in this type of closing mechanism, the bolt, which has been rotated in the opening direction and released from closing, is locked at a predetermined rotational position and its rotation is restricted, thereby causing failures in closing and malfunction. In addition, in the closed position, the lock is released and the bolt is rotated in the closing direction.

The present invention relates to an improvement of the bolt locking device of the above-mentioned rotary lock system. Prior to explaining the present invention, an outline of the rotary lock system will be described and losses of the system will be explained.

In FIG. 1, the rear seat body 1 consists of a bolt holding part 2 located on the lower side of the figure and a restoring spring holding part 3 located on the upper side of the figure. Note that the rear seat body 1 has some differences in its configuration and shape depending on the type of firearm, and is not limited to the embodiments.
There is also a type that does not have the restoring spring holding part 3, but this does not impair the purpose of the present invention.

The bolt 4 is fitted into the bolt holder 2 so that it can move back and forth within a predetermined range (move left and right in the figure) as described later, and can also rotate in the forward or reverse direction within a predetermined angle with respect to the gun shaft. It's getting old. As shown in FIG. 2, the rotating lug 5 provided at the front end of the bolt 4 is
A large number of them are provided so as to protrude like gears from the outer periphery of the chamber, and are engaged with and disengaged from a closing lug 5a on the chamber side, a portion of which is shown by dotted lines in FIG. 5, to open and close the entrance of the chamber.

The bolt 4 has a cam pin 6 that penetrates the outer circumference in the diametrical direction.
is implanted, and the head of the pin (on the right side when viewed from the muzzle)
6a extends from the outer periphery of the bolt 4 through the cam groove 7 to the outside of the outer wall of the rear seat body 1. On the other hand, the cam groove 7 is located on one outer wall of the rear seat body 1 (on the right side when viewed from the muzzle).
As mentioned above, the head of the cam pin 6 projects outward from the outer wall of the rear seat body 1 through this groove. The bolt 4 moves back and forth within the rear seat body 1 within the range of the longitudinal length of the cam groove 7, and rotates in the axial direction in the forward or reverse direction due to this back and forth movement.

Further, a firing pin 8 is disposed passing through the axial center of the bolt 4 and the cam pin 6, and is biased toward the breech side (right side in FIG. 1) by a firing pin spring 9.
Its tip is located behind the capsular surface 10, that is, the capsulum 4
It's stuck inside. Further, although not shown, a restoring spring is housed in the restoring spring holding portion 3. As described above, the rear seat body 1 that holds the bolt 4 and the restoring spring
is housed in the breech tube 26, a portion of which is shown in FIGS. 2, 4, and 5, respectively, and the gun is reseated as described below to continuously repeat opening and closing of the gun. It is.

The operating state will be explained below.

First, FIG. 1 shows the rear seat body 1 in a closed state. In this case, the bolt 4 is fitted into the rear seat body 1 to the maximum extent as shown, the cam pin 6 is in contact with the rightmost end surface of the cam groove 7 shown in FIG. is engaged with the fixed lug 5a, and the chamber entrance is closed. In this state, when the firing mechanism (not shown) is activated, the firing pin 8 acts on the bullet in the chamber, firing is performed, and the rear body 1
is seated rearward in the transition tube 26 while pressing the restoring spring by the gas pressure operating mechanism.

Therefore, in the very early stage of the rear seat, the cam groove 7 does not rotate the bolt 4, and only the rear seat body 1 sits rearward and maintains the closed position. After this instantaneous time lag, the bolt 4 is rotated in the release direction by the cam groove 7 of the rear seat body 1 seated at the rear, and the third
As shown in the figure, when the cam pin 6 is seated back to the position where it touches the front end surface (the left end surface in the figure) of the cam groove 7, the rotation of the bolt 4 ends, and the rotating lug 5 that has been engaged so far is At this point, a portion thereof is located in the valley of the fixed lug 5a on the side of the chamber, which is indicated by a dotted line, and the engagement is disengaged, leaving the entrance of the chamber in an open state. As shown in FIG. 3, the rear seat body 1 protrudes from the front part of the bolt 4, and in this state, the rear seat body 1 sits back to a predetermined position while hooking the bolt 4, and on the way there, it is struck. At the same time, the cartridge is pulled out from the chamber and kicked out of the breech body 26.

The rear seat body 1, which has completed its rear seat, is again pressed by the restoring spring and returns to its seat.During the process, it pulls out a cartridge (both not shown) from the magazine and continues to return to its seat while carrying it. rotating lug 5 and fixed lug 5 of the chamber
As mentioned above, they pass each other through the valley,
The tip of the bolt 4 comes into contact with the rear end of the chamber to prevent it from resting further, and the cartridge is loaded into the chamber. However, as mentioned above, when the rear seat body 1 is opened,
Since the bolt 4 is pulled out a predetermined length from the rear seat body 1 and then turned in the opening direction and returned to the rear seat in the state shown in FIG. The bolt 4 is returned to its seat by the amount that it has been pulled out, and as a result of this restoring, the bolt 4 is reversely rotated by the cam groove 7 to close in the opposite direction to that described above, and as shown in FIG. 1, and the cam pin 6 returns to its seat until it touches the rear end of the cam groove 7, the restoring of the rear seat body 1 is completed, and the rotating lug 5 and fixed lugs 5, 5a, which had been disengaged, are engaged again. The chamber entrance is closed and one cycle of firing operation is completed. As is well known, in military guns, such cycles are repeated at high speed, several hundred times per minute.

In the case of guns such as those mentioned above, it is natural that the firing mechanism and related mechanisms must be operated in an orderly manner according to a certain order of operation in order to perform the firing operation smoothly. It is extremely important that the rotating lug 5 of the bolt 4 engages securely with the fixed lug 5a on the chamber side to completely close the chamber entrance, and if improper or incomplete closure occurs. This does not make it impossible to shoot, and may cause serious accidents by causing injury to persons or firearms.

However, in order to completely close the rear seat body 1,
The state shown in FIG. 3 is that the bolt is seated at the rear and the bolt 4 is rotated in the opening direction, the bolt 4 is pulled out from the rear seat body 1 by a predetermined length, and the cam pin 6 comes into contact with the front end surface of the cam groove 7. The vehicle must be held and then reseated.
If this state cannot be maintained and the bolt 4 is
If it gets inside, the bolt 4, which was in the open position, will rotate in the opposite direction in the closing direction, and the rotating lug 5 and the fixed lug 5a will interfere with each other when reseating, making it impossible to open and close or causing incomplete closing. There is a need for some kind of measure to lock the bolt 4 in the open/closed position and prevent the bolt 4 from entering the rear seat body 1 and rotating in the opposite direction during rearward seating.

In the past, various devices for locking the bolt have been proposed as a countermeasure to this problem, and some of these devices are already in practical use. For example, in a typical civilian gun, a rotatable locking lever is attached to the rear seat, and when only the rear seat is seated, the locking bar is rotated toward the bolt to lock it to the bolt. There are some types of guns that fix the bolt and rear seat body in the direction of the gun axis to prevent the bolt from entering the rear seat body. In order to prevent reverse rotation, a guide groove is provided in the side wall of the transition tube into which the head of the cam pin fits.The guide groove is formed by machining when the transition tube is forged, or by machining when the transition tube is made of sheet metal. The parts are manufactured by sheet metal processing and welded together.

However, the former type cannot be used in small weapons that fire continuously, especially military guns, due to problems in terms of strength and maintenance, and the latter type, which is machined, contributes to reducing the weight of the gun. It is not possible to do so, and it is not suitable as it increases the manufacturing cost.Also, sheet metal processing requires unnecessarily high precision and has disadvantages such as being prone to malfunction due to the intrusion of earth and sand. , none of them could be said to be desirable.

The present invention has been made in view of the above-mentioned circumstances in order to provide a more suitable device that eliminates the drawbacks of conventional devices. That is, the present invention attaches a cam lock plate to the rear body of a gun so as to be rotatable in a direction intersecting the gun axis, urges the plate in a direction away from the bolt using a new plunger, and A pressure protrusion is provided on the inner wall of the cylinder, and a cam lock plate locks the head of the cam pin to prevent rotation, and when necessary, the lock is released to allow rotation.As a result, it can withstand even severe usage conditions. The purpose of this invention is to provide a bolt lock mechanism for military guns, etc.

The present invention will be described below based on embodiments with reference to the drawings.

As mentioned above, in FIGS. 1 and 3, the rear seat body 1 consists of the bolt holding part 2 and the restoring spring holding part 3. Mounting mounts 1 on both ends
A hollow resetting spring chamber 13 whose front end on the muzzle side is closed is attached to 1 and 12 by screwing or by an appropriate method, and the resetting spring is housed in the resetting spring chamber 13. There is a mounting gap 1 between the dust cover 14 that is attached to cover the restoring spring chamber 13 and the bolt holding part 2.
5 is formed. As shown in FIG. 4, the base of the rear mounting mount 12 is shaped like a so-called cocoon by cutting out the front (muzzle side) and rear (breech side) of the cylindrical body. This serves as a fitting portion 28 of the plate 16. Bolt holding part 2
As described above, the bolt 4 is held so that the cam pin 6 slides within the length of the cam groove 7 to rotate the bolt 4 forward or backward by a predetermined angle to close or open the chamber inlet. The head 6a of the cam pin 6 protrudes from the rear seat body 1 by a predetermined length, and the firing pin 8 biased by the firing pin spring 9 is housed in the bolt as described above.

The cam lock plate 16, which is a main part of the present invention, is provided with an actuating piece 18 that hangs down from a base plate 17 that is integral with the cam lock plate, and a locking piece 19 projects from the actuating piece. Further, on the rear end of the cam lock plate 16 on the breech side, a fitting hole 21 is provided with a part cut out in an arc shape and used as an insertion part 20.
It is attached to the fitting part 28 as described below. That is,
In FIG. 4, the insertion portion 20 is inserted toward the fitting portion 28 from the side where the cam groove 7 is provided in the lower rear seat body 1, and then rotated approximately 90 degrees upward in FIG. , the base plate 17 of the cam lock plate 16 enters the mounting gap 15 between the bolt holder 2 and the dust cover 14, and is mounted to the rear seat body 1 so as to be rotatable in a direction intersecting the gun axis. As shown in FIGS. 3 and 4, the actuating piece 18 hangs down along the rear seat body 1, and the locking piece 1
Reference numeral 9 indicates the breech side of the head 6a of the cam pin 6 which is in contact with the front end side of the cam groove 7 when only the rear seat body 1 is seated at the rear and the bolt 4 is turned in the opening direction. The drilling position is set so that it is almost on the same line as the
In addition, the front end of the board 17 is attached to the mounting mount 1 on the muzzle side.
The cam lock plate 16 is inserted into a guide groove 22 formed at the base of the cam lock plate 16 to prevent it from jumping when the cam lock plate 16 rotates.

Next, in the case of the plunger mechanism 23 provided near the front end of the rear seat body 1, the plunger 24
The pressing pin 25, which is urged by the cam lock plate 16, comes into contact with the actuating piece 18 of the cam lock plate 16, and urges it toward the inner wall of the transition piece 26 (see FIG. 5).

Further, a pressing protrusion 2 provided on the inner wall of the transition piece 26
7 is formed by extending the transition piece 26 toward the inner wall side by pressing or the like, and its mounting position is determined as follows. That is, the pressing protrusion 27
The front starting point (starting point on the left in Figure 4) is
As shown in FIGS. 3 and 4, when only the rear seat body 1 is seated rearward, the bolt 4 rotates in the opening direction, and the cam pin 6 comes into contact with the front end of the cam groove 7, the cam lock plate 16 is activated. The rear side of the piece 18 engages with the front end of the pressing projection 27, and the cam lock plate 16 pushes the pressing pin 25 against the spring 24 while pushing the rear seat body 1.
It is positioned so that it is pushed back to the side, and
The rear end of the pressing protrusion 27 is positioned to be equal to or slightly longer than the rear seat amount of the rear seat body 1 .

The bolt lock mechanism of the present invention based on the above configuration operates as follows. That is, as shown in FIG. 1, when the bolt 4 is retracted into the rear seat body 1 and rotated in the closing direction, the rotating lug 5 and the fixed lug 5a are engaged and the chamber entrance is closed. Since the actuating piece 18 of the cam lock plate 16 and the pressing protrusion 27 do not engage, the cam lock plate 16 does not engage with the pressing pin 25.
2, the head 6a of the cam pin 6 is not restricted in its movement. In this state, the cam pin 6 is in contact with the rear end side of the cam groove.

If a shot is fired under such conditions, first,
When the bolt holder 2 of the rear seat body 1 is seated rearward and rotates the bolt 4 in the opening direction until the cam pin 6 comes into contact with the front end side of the cam groove 7 as shown in FIG. 3, the chamber entrance is closed. Since the closing is opened and the rear end side of the actuating piece 18 of the cam lock plate 16 engages with the pressing protrusion 27 (see FIG. 4), the cam lock plate 16 presses the pressing pin 25 against the spring 24 while pressing the pressing pin 25. A locking piece 19 that rotates toward the upper side in FIG.
As shown in FIGS. 3 and 5, the head 6a of the cam pin 6 is engaged with the breech side of the cam pin 6, thereby locking the bolt 4. As described above, the pressing protrusion 27 is provided approximately equal to or slightly longer than the amount of the rear seat of the rear seat body 1, so that the subsequent rear seat is provided with the bolt 4.
is performed in a completely locked state, and even if any external force is applied to the bolt 4, it will not enter the rear seat body 1 and reversely rotate in the closing direction, thus eliminating the disadvantage of being unable to close or incompletely closing. is completely excluded.
The rear seat body 1 returns to the position shown in FIG.
When the rotating lug 5 passes through the valley of the fixed lug 5a on the side of the cartridge and hits the rear end of the chamber and the rear seat is stopped, the actuating piece 18 of the cam lock plate 16 moves backward as shown in FIG. As described above, the end portion engages with the front starting end of the pressing projection 27. Therefore, as described above, the restoring of the bolt 4 is restricted, and when the bolt 4 is brought back to rest, the engagement between the actuating piece 18 and the pressing protrusion 27 is released, so that the cam lock plate 16 is pressed by the pressing pin 25. The locking piece 19 is then pushed back until it comes into contact with the inner wall of the tail piece 26 (see FIG. 2), and the locking piece 19 is released from the locking with the head 6a of the cam pin 6, and the bolt 4 is unlocked. Then, when the rear seat body 1 returns to a predetermined position, the bolt 4 reversely rotates in the closing direction to close the chamber entrance. This one cycle operation is continuously performed at high speed several hundred times per minute.

In this embodiment, the cam lock plate 16 is mounted by fitting it into the base of the mounting mount 12, but of course this can be done in the case of a rear seat body that does not have the restoring spring holding part 3. The mounting direction will be different. The point is that it can be attached to the rear seat body so as to be rotatable in a direction intersecting the gun axis, and the attachment method does not matter.

The present invention is based on the above-described structure, and the bolt is locked and released by three members: the cam lock plate, the pressing protrusion, and the plunger mechanism. Although the structure is relatively simple, the operation is It is extremely reliable and has a low occurrence of breakdowns, does not cause malfunction even if dust, water, etc. enter, and can withstand harsh usage conditions.Moreover, it requires a high degree of processing precision. Since this method does not require any additional processing, it is possible to reduce manufacturing costs. especially,
Since the cam lock plate is supported by a plunger mechanism, it has many advantages, such as the fact that slight dimensional errors and deformation during use can be absorbed by the springs, making this invention particularly useful when applied to military guns. It is.

[Brief explanation of drawings]

The drawings show the main parts of the embodiment of the present invention.
The figure is a cross-sectional view of the rear seat body in the closed position, Figure 2 is a left side view of Figure 1 with the transition piece added, Figure 3 is a side view of the rear seat body in the open position, and Figure 4 is the tail FIG. 3 is a partially omitted sectional view taken along the line A-A in FIG. 3 with a cylinder added, and FIG. 5 is a left side view of FIG. 3 with a transition piece added. 1...Rear seat body, 4...Role sole, 5...Rotating lug,
5a... Fixed lug, 6... Cam pin, 7... Cam groove, 16... Cam lock plate, 18... Operating piece, 19... Locking piece, 21... Fitting hole, 23...
Plunger mechanism, 27...pressing protrusion, 28...
Fitting part.

Claims (1)

[Scope of Claims] 1. The bolt is rotated at a predetermined angle in the forward or reverse direction as the rear seat body reciprocates, and the rotating lug of the bolt is engaged and disengaged from the fixed lug of the chamber to open the chamber entrance. Or, in a locking mechanism for a bolt in a firearm that closes, a cam lock plate that is rotatable in a direction intersecting the gun axis is provided on the rear seat body that holds the bolt, and the cam lock plate is attached to the rear seat body by a plunger. A protrusion is provided at a predetermined position on the inner wall of the transition tube to push the cam lock plate back toward the rear seat body against the spring pressure of the plunger, and the cam lock plate is pressed against the cam pin. A locking mechanism for a bolt in a firearm, which is characterized by being able to engage and disengage. 2. A locking mechanism for a bolt in a firearm according to claim 1, wherein the protrusion is protruded from the inner wall of the tail cylinder by press working.