A quick-change shell puller hook shaft limit protection structure

Abstract

The invention discloses a quick-change type shell hook shaft limiting protection structure, comprising a machine frame, a machine head body, a shell hook and a shell hook shaft installed on the machine head body, wherein a convex shoot is axially arranged at the front end of the machine frame body, and the convex shoot is located directly behind the locking tooth of the machine head body when the bolt is in an unlocked state, and is used to press the shell hook shaft, and the shell hook shaft comprises a rod and a head, and an accommodating groove is axially arranged at the front end of the rod of the machine head body, and is used to place the shell hook shaft head to prevent the shell hook shaft head from twisting, and a through hole is radially opened in the accommodating groove, and is used to install the shell hook shaft rod, and the shell hook shaft head is always blocked by the convex shoot bottom of the front end of the machine frame body and does not jump out of the machine head body during the unlocking / locking working cycle of the bolt. The structure of the invention can improve the maintenance performance of the bolt, facilitate the rapid replacement and disassembly and cleaning requirements of the shell hook shaft, and does not occupy the outer size of the machine head, and does not increase the volume of the locking part of the firearm, which is conducive to reducing the weight of the firearm and improving the mobility.

Description

Technical Field

[0001] The invention relates to the technical field of firearms, and in particular to a quick-change shell extractor hook shaft limiting protection structure. Background Art

[0002] Foreign AR series rifles, such as the M16 and M4, all use a cylindrical extractor shaft. In the unlocking / locking working cycle, the extractor shaft is completely blocked by the machine frame to prevent it from jumping out. The advantages are simple structure and good processability, but the structure is only suitable for structures with small unlocking / locking strokes. Small unlocking and locking strokes mean large unlocking and locking spiral angles and small free strokes after locking. Large unlocking and locking spiral angles bring about large unlocking and closing resistance. Small free strokes after locking can only use an elastic ejection structure, and the ejection spring of the elastic ejection structure is used to overcome the rebound of the bolt in place. The elastic ejection structure is affected by the ejection spring, and has poor reliability in rivers with sediment and dust conditions. The foreign AK series and the domestic 56 series, 81 rifle series, and 95 / 95-1 squad gun family all use a structure that uses a solid or elastic cylindrical firing pin pin to lock the extractor shaft. Its advantages are simple structure and good processability, but the head structure is large in size, resulting in a large and heavy structure of the entire gun, and there is a risk of the extractor shaft popping out during operation, affecting reliability. Summary of the invention

[0003] The purpose of the present invention is to provide a quick-change shell extractor shaft limit protection structure to address the problems existing in the prior art, which can improve the maintainability of the bolt, facilitate the rapid replacement and disassembly and cleaning requirements of the shell extractor shaft, and does not occupy the outer size of the gun head and does not increase the volume of the locking part of the firearm, which is beneficial to reducing the weight of the firearm and improving the maneuverability.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A quick-change shell extractor hook shaft limit protection structure includes a machine frame, a machine head body sleeved in the machine frame, a shell extractor hook connected to a shell extractor hook groove in the machine head body, and a shell extractor hook shaft installed on the machine head body, wherein the front end of the machine frame body is axially provided with a protrusion, and the protrusion is located directly behind the locking tooth of the machine head body when the bolt is unlocked, and is used to compress the shell extractor hook shaft, and the shell extractor hook shaft includes a rod and a head, and the front end of the rod of the machine head body is axially provided with a receiving groove for accommodating the shell extractor hook shaft head to prevent the shell extractor hook shaft head from twisting, and a through hole is radially opened in the accommodating groove for installing the shell extractor hook shaft rod, and the shell extractor hook shaft head is always blocked by the bottom of the protrusion at the front end of the machine frame body and does not jump out of the machine head body during the unlocking / locking working cycle of the bolt.

[0006] Preferably, the shell puller hook shaft head has a symmetrical or asymmetrical structure relative to the rod portion, a weight-reducing inclined surface is provided at the long end of the asymmetrical structure to reduce rotational inertia, and a chamfer is provided between the shell puller hook shaft head and the rod portion to increase strength.

[0007] Preferably, the shell extractor hook shaft head has a symmetrical or asymmetrical structure relative to the rod portion, and a chamfer is provided between the shell extractor hook shaft head and the rod portion for increasing strength.

[0008] Preferably, a clearance groove is provided between the receiving groove and the through hole of the head body rod portion, which is used for chamfering and making way when the shell puller hook shaft is installed.

[0009] Preferably, the longitudinal cross-sectional dimension of the projection at the front end of the machine frame is smaller than the cross-sectional dimension of the locking tooth of the machine head body, so that the projection does not interfere with the sleeve during the unlocking / locking process of the bolt.

[0010] Beneficial effects of the present invention:

[0011] The shell extractor hook shaft is designed to be an integrally formed rod and head, a receiving groove and a through hole are provided on the machine head body, the shell extractor hook shaft head is placed in the receiving groove, the shell extractor hook shaft is axially limited to prevent the head from twisting, and a protrusion is provided at the front end of the machine frame body. During the unlocking / locking working cycle of the bolt, the bottom of the protrusion of the machine frame body always blocks the shell extractor hook shaft head, ensuring that the shell extractor hook shaft does not jump out of the machine head body and collide with the machine frame body and the end face of the mounting hole of the machine head body.

[0012] It can be used in bolt structures with small size and light weight, and can also be used in bolts with large opening and closing strokes, large free stroke after locking, and rigid ejection structure.

[0013] The shell hook shaft and the machine head body adopt clearance fit, which has good maintainability and is convenient for quick replacement and disassembly and cleaning of the shell hook shaft.

[0014] It has good ergonomics, does not occupy the outer dimensions of the gun head, and does not increase the volume of the gun's locking part, which is beneficial to reducing the gun's weight and improving its maneuverability.

[0015] The utility model has a simple structure, is suitable for being widely used in similar weapons in which the shell extractor hook is arranged between two locking teeth, and has good transplantability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the unlocking structure of the present invention;

[0017] Figure 2 A top view of the unlocking structure of the present invention;

[0018] Figure 3 It is a schematic diagram of the locking structure of the present invention;

[0019] Figure 4It is a structural schematic diagram of the machine frame;

[0020] Figure 5 It is a structural schematic diagram of the nose body;

[0021] Figure 6 It is the front view of the shell puller hook shaft;

[0022] Figure 7 It is a top view of the shell puller hook shaft;

[0023] Figure 8 It is the left view of the shell puller hook shaft.

[0024] Reference numerals

[0025] 1. Machine frame; 2. Machine head; 3. Shell puller; 4. Shell puller shaft;

[0026] 101, protruding shoots; 201, receiving groove; 202, giving way groove; 203, through hole;

[0027] 401, shell puller shaft head; 402, weight reduction slope; 403, chamfer between the rod and the head; 404, shell puller shaft rod. DETAILED DESCRIPTION

[0028] The working principle and structure of the present invention are further described in detail below in conjunction with the embodiments and drawings.

[0029] like Figures 1 to 8 As shown, a quick-change shell extractor shaft limiting protection structure for a certain type of firearm is provided, comprising a machine frame body 1, a machine head body 2 sleeved in the machine frame body 1, a shell extractor hook 3 connected to a shell extractor hook groove of the machine head body 2, and a shell extractor hook shaft 4 installed on the machine head body 2, wherein the front end of the machine frame body 1 is provided with a convex shoot 101 along the axial direction, and the convex shoot 101 is located directly behind the locking tooth of the machine head body when the bolt is unlocked, and is used to press the shell extractor hook shaft 4, and the shell extractor hook shaft 4 includes a rod portion 404 and a head portion 401, and the front end of the rod portion of the machine head body is provided with an accommodating groove 201 along the axial direction, and is used to place the shell extractor hook shaft head portion 401 to prevent the shell extractor hook shaft head portion 401 from twisting, and a through hole 203 is opened radially in the accommodating groove 201, and is used to install the shell extractor hook shaft rod portion 404,

[0030] like Figure 6-Figure 8 As shown, in the present embodiment, the shell extractor hook shaft head 401 is an asymmetric T-shaped structure relative to the rod 404, and a weight-reducing inclined surface 402 is provided at the long end to reduce the rotational inertia. An arc-shaped chamfer is provided between the shell extractor hook shaft head 401 and the rod 404 to increase the connection strength between the shell extractor hook shaft rod 404 and the head 401. Of course, in the present embodiment, the shell extractor hook shaft head 401 may also be a symmetrical T-shaped structure relative to the rod.

[0031] In this embodiment, a clearance groove 202 is provided between the receiving groove 201 of the head body rod and the through hole 203, which is used to make way for the arc chamfer when the shell extractor shaft is installed, ensuring that the arc chamfer 403 of the shell extractor shaft rod 404 and the head 401 does not interfere with the receiving groove 201 of the head body 2.

[0032] In this embodiment, the longitudinal cross-sectional dimension of the projection 101 at the front end of the frame body is smaller than the cross-sectional dimension of the locking teeth of the head body, so that the projection does not interfere with the sleeve during the unlocking / locking process of the bolt.

[0033] After the shell extractor hook shaft in the present embodiment is installed in the receiving groove and the through hole of the machine head body, during the unlocking / locking working cycle of the bolt, the head of the shell extractor hook shaft is always blocked by the bottom of the protrusion at the front end of the machine frame body, ensuring that the shell extractor hook shaft does not jump out of the machine head body and collide with the machine frame body and the end face of the mounting hole of the machine head body, thereby ensuring the safety of the bolt during the working cycle.

[0034] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. 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 quick-change shell hook shaft limit protection structure, comprising a machine frame, a machine head body sleeved in the machine frame, a shell hook connected in a shell hook groove of the machine head body, and a shell hook shaft installed on the machine head body, characterized in that: A protrusion is axially provided at the front end of the machine frame body, and the protrusion is located directly behind the locking tooth of the machine head body when the bolt is unlocked, and is used to compress the shell extractor hook shaft. The shell extractor hook shaft includes a rod and a head. The front end of the rod of the machine head body is axially provided with a receiving groove for accommodating the head of the shell extractor hook shaft to prevent the head of the shell extractor hook shaft from twisting. A through hole is radially opened in the accommodating groove for installing the rod of the shell extractor hook shaft. In the unlocking / locking working cycle of the bolt, the head of the shell extractor hook shaft is always blocked by the bottom of the protrusion at the front end of the machine frame body and does not jump out of the machine head body.

2. A quick-change shell puller hook shaft limiting protection structure according to claim 1, characterized in that: The shell extractor hook shaft head has an asymmetric structure relative to the rod portion, and a weight-reducing inclined surface is arranged at the long end to reduce the rotational inertia. A chamfer is arranged between the shell extractor hook shaft head and the rod portion to increase the strength.

3. The quick-change shell puller hook shaft limiting protection structure according to claim 1, characterized in that: The shell extractor shaft head has a symmetrical or asymmetrical structure relative to the rod portion, and a chamfer is provided between the shell extractor shaft head and the rod portion for increasing strength.

4. A quick-change shell puller hook shaft limiting protection structure according to claim 2 or 3, characterized in that: A clearance groove is arranged between the receiving groove and the through hole of the head body rod part, which is used for chamfering and making way when the shell puller hook shaft is installed.

5. The quick-change shell puller hook shaft limiting protection structure according to claim 1, characterized in that: The longitudinal cross-sectional dimension of the protrusion at the front end of the machine frame is smaller than the cross-sectional dimension of the locking teeth of the machine head body, so that the protrusion does not interfere with the joint sleeve during the unlocking / locking process of the bolt.

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