Normally-closed type shell ejection window dustproof cover structure and working method thereof

Abstract

The invention discloses a dust cover structure of a normally-closed type shell ejecting window. The reliability of ammunition supply and the adaptability of firearms are improved. In the unlocking recoil process of the gunlock, the face A of the reed and the reset spring seat are pushed to move backwards, the reset spring is compressed, meanwhile, the shell ejection window is opened, after the gunlock completes shell ejection, the gunlock continues to drive the window shielding plate assembly to move backwards till the inclined face C on the cartridge receiver body makes contact with the face B of the reed, the inclined face C enables the opening arm of the reed to be compressed and lifted, the reed is disengaged from the gunlock, and under the action of the reset spring, the shell ejection window is opened. And the window shielding plate assembly moves forwards, the opening arm of the reed is reset, the shell ejecting window is closed by the window shielding plate, and the shell ejecting window is in a closed state in the bullet pushing and locking process of the gunlock.

Description

Technical Field

[0001] The present invention relates to the technical field of firearms, and in particular to a normally closed shell ejection window dust cover structure and a working method thereof. Background Art

[0002] Currently, some firearms lack dust covers for their ejection ports due to design concepts and functional priorities. Some firearms do have dust covers, but they remain open during firing and must be manually closed after the shot is fired. This means that the ejection ports of existing firearms remain open throughout the firing process. The rapid development of unmanned platforms, owing to their increasingly complex and diverse operating environments, places higher demands on the reliability of the firearms they carry. Furthermore, due to the limited internal space of unmanned platforms, firearms mounted on these platforms must adopt a variety of mounting positions, requiring excellent adaptability to ensure reliable operation in all mounting positions. Currently, the ejection port of firearms remains open throughout the firing process. When a firearm is mounted on an unmanned platform in various positions, the bullet may escape the designated feed path and escape through the open ejection port during the loading process, significantly reducing the firearm's reliability. Furthermore, when used in complex and harsh environments, weapons with normally open ejection ports are more susceptible to malfunctions due to the intrusion of foreign matter. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a normally closed ejection window dust cover structure and a working method thereof, thereby improving the reliability of ammunition feeding and the adaptability of firearms.

[0004] The object of the present invention is achieved in that:

[0005] A normally closed shell ejection window dust cover structure comprises a receiver body, a bolt carrier disposed within the receiver body, an ejection window disposed on a wall of the receiver body, a window shutter assembly, a return spring, and a return spring guide rod, wherein the return spring guide rod is longitudinally mounted on the receiver body, the return spring is sleeved on the return spring guide rod, and a window shutter guide rail is disposed on the wall of the receiver body;

[0006] The window shield assembly includes a return spring seat, a window shield and a spring leaf, wherein the return spring seat is slidably engaged with the return spring guide rod, one end of the return spring acts on the receiver body, and the other end acts on the return spring seat, the spring leaf is a bent structure, one bent end of the spring leaf is fixedly connected to the return spring seat, and the other bent end of the spring leaf is an opening arm, the opening arm / return spring seat is fixedly connected to the window shield, one end of the window shield is slidably engaged with the window shield guide rail, and under normal conditions, the opening arm is in an open state, and under the action of the return spring, the window shield closes the ejection window;

[0007] The end face of the open arm is set as the A surface. The A surface of the open arm corresponds to the rear end of the bolt. The inclined surface of the open arm facing away from the return spring seat is the B surface. An inclined surface C is provided on the receiver body corresponding to the B surface of the open arm. During the unlocking and recoil process of the bolt, the inclined surface C can exert pressure on the B surface to contract the open arm, and under the action of the return spring, the shutter plate is reset.

[0008] Preferably, the root of the open arm is fixedly connected to the shutter plate.

[0009] Preferably, the return spring seat and the shutter plate are respectively welded and fixed to the reed.

[0010] Preferably, a base is fixed at one end of the receiver body. (The base is used to install the receiver; the recoil spring guide rod passes through the recoil spring guide rod mounting hole, and the base and the receiver are connected by screws to prevent the axial movement of the recoil spring guide rod; it is also used to install other components)

[0011] Preferably, a relief opening is provided on the receiver body. The inclined surface C is located at the end of the relief opening. The relief opening is used to make way for the movement of the open arm.

[0012] A working method of a normally closed ejection port dust cover structure

[0013] Working process:

[0014] Step 1: During the unlocking and recoil process of the bolt, push the A surface of the reed, and the reed drives the shutter plate assembly to move backward and compress the return spring for energy storage. The shutter plate assembly moves backward and no longer covers the ejection port, and the ejection port is exposed, thus opening the ejection port. (The hole on the return spring seat of the shutter plate assembly has a clearance fit with the return spring guide rod, and the shutter plate assembly can slide along the return spring guide rod)

[0015] Step 2: After the bolt completes ejection, the bolt continues to drive the shutter plate assembly to move backward until the inclined surface C on the receiver body contacts the B surface of the reed. The inclined surface C causes the open arm of the reed to be compressed and lifted, and the reed is disengaged from the bolt.

[0016] Step 3: Under the action of the return spring, the shutter plate assembly moves forward, the open arm of the reed resets, the shutter plate closes the ejection port, and the ejection port is in a closed state during the bolt's bullet feeding and locking process.

[0017] Due to the adoption of the above technical solutions, the present invention has the following beneficial effects:

[0018] The ejection port is only opened for a short time during ejection, greatly reducing the possibility of foreign objects entering the firearm during use under various environmental conditions. At the same time, when the firearm adapts to different unmanned platforms in different postures, the shutter plate can effectively block the bullet from escaping during the feeding process, improving the feeding reliability and the adaptability of the firearm. Description of the drawings

[0019] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the shutter plate assembly; Figure 3 It is a structural schematic diagram of the return spring guide rod; Figure 4 It is a structural schematic diagram of the receiver body; Figure 5 It is a sectional schematic diagram of the present invention. Specific embodiments

[0023] A normally closed ejector window dust cover structure, which automatically opens the ejector window during ejection. After ejection is completed, before the bolt pushes the cartridge into the chamber, it automatically closes the ejector window. The ejector window of the firearm is only open for a short time during ejection, greatly reducing the possibility of foreign objects entering the interior of the firearm during use under various environmental conditions and improving its working reliability. At the same time, when the firearm adapts to different unmanned platforms in different postures, the shutter plate can effectively block the bullet from escaping during the feeding process, improving the feeding reliability and the adaptability of the firearm.

[0024] The technical solution adopted by the present invention is as follows:

[0025] The normally closed ejector window dust cover structure is composed of a shutter plate assembly, a return spring, a return spring guide rod, a base, and a receiver body, etc.

[0026] The shutter plate assembly is formed by welding a return spring seat, a shutter plate, and a reed together; during the unlocking process, the bolt retracts and contacts the A side of the reed, and then drives the shutter plate assembly to retract to open the ejector window through the reed; the B side of the reed cooperates with the inclined surface C on the receiver body. During the retraction process of the shutter plate assembly, the inclined surface C cooperates with the B side of the reed, causing the reed to be compressed, so that the A side is disengaged from the bolt, and the shutter plate closes the ejector window under the action of the return spring.

[0027] The return spring guide rod is assembled on the receiver body. The receiver body and the base are connected by screws to completely position it. A return spring is installed on the return spring guide rod. At the same time, it has a clearance fit with the return spring seat of the shutter plate assembly, and the return spring and the shutter plate assembly can move axially along the return spring guide rod.

[0028] The return spring is assembled on the return spring guide rod and acts on the shutter plate assembly.

[0029] The receiver body is provided with a shutter plate guide rail, a return spring guide rod mounting hole, and an inclined surface C; the combined action of the shutter plate guide rail and the return spring guide rod restricts the movement of the shutter plate assembly in the axial direction of the return spring; when the shutter plate assembly moves to the point where the B side of the reed interacts with the inclined surface C of the receiver body, the reed is lifted, the A side is disengaged from the bolt, and the shutter plate assembly is reset to close the ejector window under the action of the return spring.

[0030] Working process:

[0031] During the process of the bolt unlocking and recoiling, the A surface of the push spring piece is pushed, and the shutter assembly moves backward to compress the return spring. At the same time, the ejection window is opened to complete ejection. The bolt continues to drive the shutter assembly to move backward. The inclined surface C on the receiver contacts the B surface of the spring piece. The inclined surface C compresses and lifts the spring piece, and the spring piece is disengaged from the bolt. Under the action of the return spring, the shutter assembly moves forward to close the ejection window. During the process of the bolt pushing the cartridge and locking, the ejection window is in a closed state. The ejection window is only opened briefly during ejection, greatly reducing the possibility of foreign objects entering the firearm during use under various environmental conditions. At the same time, when the firearm adapts to different unmanned platforms in different postures, the shutter can effectively block the bullets from escaping during the feeding process, improving the feeding reliability and the adaptability of the firearm.

[0032] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A normally closed dust cover structure for the ejection port, comprising a receiver body, a bolt is arranged inside the receiver body, and an ejection port is arranged on the wall of the receiver body, and it is characterized in that: It further includes a shutter assembly, a return spring, and a return spring guide rod. The return spring guide rod is longitudinally installed on the casing body. The return spring is sleeved on the return spring guide rod, and a shutter guide rail is provided on the wall of the casing body. The shutter assembly includes a return spring seat, a shutter, and a reed. The return spring seat is slidably fitted on the return spring guide rod. One end of the return spring acts on the casing body, and the other end acts on the return spring seat. The reed is of a bent structure. One bent end of the reed is fixedly connected to the return spring seat, and the other bent end of the reed is an opening arm. The opening arm / return spring seat is fixedly connected to the shutter. One end of the shutter is slidably fitted on the shutter guide rail. In the normal state, the opening arm is in an open state. Under the action of the return spring, the shutter closes the ejection port. The end face of the end of the opening arm is set as surface A. Surface A of the opening arm corresponds to the rear end of the bolt. The inclined surface facing away from the return spring seat of the opening arm is surface B. An inclined surface C corresponding to surface B of the opening arm is provided on the casing body. During the process of the bolt unlocking and recoiling, the inclined surface C can press on surface B to make the opening arm contract. Under the action of the return spring, the shutter is reset.

2. The normally closed ejection port dust cover structure according to claim 1, wherein: The return spring seat and the shutter are respectively welded and fixed to the reed.

3. A normally closed ejection port dust cover structure according to claim 1, characterized in that: A base is fixed to one end of the casing body, and the base axially limits the return spring guide rod.

4. A normally closed ejection port dust cover structure according to claim 1, characterized in that: A relief opening is provided on the casing body. The inclined surface C is located at the end of the relief opening. The relief opening is used to make way for the movement of the opening arm.

5. A working method of the normally closed ejection port dust-proof cover structure according to claim 1, characterized in that: Working process: Step 1: During the process of the bolt unlocking and recoiling, push surface A of the reed. The reed drives the shutter assembly to move backward and compress the return spring for energy storage, and the ejection port is opened. Step 2: After the bolt completes ejection, the bolt continues to drive the shutter assembly to move backward until the inclined surface C on the casing body contacts surface B of the reed. The inclined surface C causes the opening arm of the reed to be compressed and lifted, and the reed is disengaged from the bolt. Step 3: Under the action of the return spring, the shutter assembly moves forward, the opening arm of the reed is reset, the shutter closes the ejection port, and the ejection port is in a closed state during the process of the bolt pushing the cartridge and locking.

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