A connecting mechanism for the upper and lower receivers of a firearm and its assembly and usage method

Abstract

This invention discloses a connecting mechanism for the upper and lower receivers of a firearm, and its assembly and usage methods, which can achieve convenient, quick, and reliable connection of the upper and lower receivers. First, the locating boss at the rear end of the lower receiver is obliquely inserted into the locating groove at the rear end of the upper receiver; then, the lower receiver is rotated until its upper surface contacts the locating boss on the lower surface of the upper receiver; next, the connecting pin is passed sequentially through the upper receiver, lower receiver, and handguard until the plane of the connecting pin lever contacts the side of the handguard; finally, the connecting pin is rotated forward 90 degrees, thereby achieving a quick connection between the upper and lower receivers.

Description

Technical Field

[0001] This invention relates to the field of firearms technology, and in particular to a connecting mechanism for the upper and lower receivers of a firearm and its assembly and usage methods. Background Technology

[0002] The upper and lower receivers of firearms are usually connected by two pins, and some even by three pins, which makes the firearms less operable during disassembly and reassembly. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a connecting mechanism for the upper and lower receivers of a firearm, as well as its assembly and usage methods, so as to achieve a convenient, fast and reliable connection between the upper and lower receivers of the firearm.

[0004] The objective of this invention is achieved as follows:

[0005] A firearm upper and lower receiver connecting mechanism includes an upper receiver, a handguard, and a lower receiver. The upper receiver has lugs on both sides of the lower plane center, and the lugs have upper connecting pin holes (103).

[0006] The rear of the two walls of the handguard are provided with lower connecting pin holes (203) in the horizontal direction. The lower connecting pin holes (203) correspond to the upper connecting pin holes (103) on the upper casing. The rear end face of one side wall of the handguard is provided with a connecting pin limiting hole (204) in the longitudinal direction. The connecting pin limiting hole (204) is provided with a limiting pin (5) and a limiting pin spring (4).

[0007] The front end of the lower casing is provided with a connecting pin hole (602), which corresponds to the upper connecting pin hole (103) and the lower connecting pin hole (203);

[0008] It also includes a connecting pin, the connecting pin (3) comprising a cylindrical section (301) and a lever (302), the cylindrical section (301) and the lever (302) being perpendicular to each other to form an L-shape, the cylindrical section (301) having a rectangular limiting groove (303) along the axial direction, and the cylindrical section (301) having an arc-shaped limiting groove (304) along the circumferential direction, the arc-shaped limiting groove (304) being located at one end of the cylindrical section (301) connecting to the lever (302), the rectangular limiting groove (303) and the arc-shaped limiting groove (304) being connected to form an L-shaped groove, the cylindrical section (301) of the connecting pin The limit pin (5) is used for positioning by inserting into the upper connecting pin hole (103) of the upper casing, the lower connecting pin hole (203) of the handguard, and the connecting pin hole (602) of the lower casing. The end of the limit pin (5) is fitted in the L-shaped groove. The lever (302) is used to drive the cylindrical section (301) to move and rotate axially. When the limit pin (5) is located in the arc-shaped limit groove (304), the limit pin (5) limits the axial position of the connecting pin. When the limit pin (5) is located in the rectangular limit groove (303), the connecting pin (3) can move axially. The limit pin (5) limits the axial limit position of the connecting pin (3).

[0009] Preferably, the lower surface of the upper casing is provided with a dovetail groove (104) at the front, and the two outer sides of the front of the upper casing are provided with dovetail bosses (105). The inner sides of the two walls of the handguard (2) are provided with dovetail grooves (202). The dovetail grooves (202) are combined with the dovetail bosses (105) of the upper casing. The front end of the dovetail grooves (202) limits the front limit position of the dovetail bosses (105). The bottom wall of the handguard is provided with a dovetail boss (201) at the front, and the dovetail bosses (201) are combined with the dovetail grooves (104) of the upper casing.

[0010] Preferably, the front two outer sides of the upper casing are provided with two dovetail-shaped protrusions (105), and the distance between the two dovetail-shaped protrusions (105) corresponds to the length of the dovetail groove (202) on the handguard (2).

[0011] Preferably, the upper casing has a positioning groove (101) on its inner rear end, and the lower casing (6) has a positioning boss (601) on its outer rear end. The positioning boss (601) engages with the positioning groove (101) of the upper casing, and the positioning groove (101) can swing along the top of the positioning boss (601), allowing the front end of the lower casing to rotate and swing relative to the upper casing along the top of the positioning boss (601). The swing can be achieved by using an inclined surface for either the positioning groove (101) or the positioning boss (601), and a flat surface for the other.

[0012] Preferably, the lower plane of the upper casing is provided with positioning bosses (102) on both sides, which are used to contact and position with the upper plane of the lower casing. The upper plane of the lower casing is provided with slots or grooves to cooperate with the positioning bosses to achieve positioning.

[0013] Preferably, the ends of the rectangular limiting groove (303) and the ends of the arc-shaped limiting groove (304) are respectively provided with limiting cone holes (305), and the limiting cone holes (305) cooperate with the limiting pin (5) to limit the position of the connecting pin.

[0014] Preferably, the outer surface of the handle (302) is provided with anti-slip grooves.

[0015] Preferably, the limiting pin (5) is provided with an installation section (501), a guide section (502), and a positioning section (503) in sequence. The installation section (501) is used to fit the limiting pin spring (4). The guide section (502) is used to slide and guide the connecting pin limiting hole (204). The positioning section (503) is spherical and is used to position the connecting pin (3).

[0016] A method for assembling a connecting mechanism for the upper and lower receivers of a firearm, wherein the dovetail groove (202) of the handguard is fitted into the dovetail boss (105) of the upper receiver, the dovetail boss (201) of the handguard is inserted into the dovetail groove (104) of the upper receiver, the lower connecting pin hole (203) of the handguard is aligned with the upper connecting pin hole (103) of the upper receiver, the limiting pin spring (4) and the limiting pin (5) are sequentially installed into the connecting pin limiting hole (204) of the handguard, the connecting pin (3) is inserted into the handguard (2) and the upper receiver (1), and the limiting pin (5) enters the connecting pin under the action of the limiting pin spring (4). The rectangular limiting groove (303) of the pin is connected, the positioning boss (601) of the lower casing is inserted into the positioning groove (101) of the upper casing, the connecting pin hole (602) of the lower casing is aligned with the upper connecting pin hole (103) of the upper casing, the connecting pin (3) passes through the lower casing (6), the upper casing (1) and the handguard (2) in sequence to the inner side of the handle and contact the side of the handguard, the connecting pin (3) rotates clockwise, the limiting pin (5) positions the connecting pin (3) circumferentially under the action of spring force, and the limiting pin (5) positions the connecting pin axially through the arc-shaped limiting groove (304).

[0017] A method for using a connecting mechanism for the upper and lower receivers of a firearm.

[0018] Connection: First, insert the positioning boss (601) of the lower casing into the positioning groove (101) of the upper casing at an angle. Then rotate the lower casing so that the upper surface of the lower casing contacts the positioning boss (102) of the lower surface of the upper casing, and the connecting pin hole (602) of the lower casing is aligned with the upper connecting pin hole (103) of the upper casing. Next, press the connecting pin (3) so that the connecting pin (3) passes through the lower casing (6), the upper casing (1) and the handguard (2) in sequence until the inner side of the handle contacts the side of the handguard. Finally, rotate the connecting pin (3) clockwise to complete the connection between the upper casing and the lower casing.

[0019] Disassembly: First, rotate the connecting pin (3) counterclockwise, then pull out the connecting pin (3) until it is limited by the limiting pin (5). Next, rotate the lower casing (6) around the positioning boss (601) until the front end of the lower casing is separated from the handguard (2). Finally, disassemble the positioning boss (601) of the lower casing from the positioning groove (101) of the upper casing, thus completing the disassembly of the upper casing and the lower casing.

[0020] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0021] The firearm upper and lower receiver connection mechanism of this invention achieves convenient, quick, and reliable connection of the upper and lower receivers through the engagement of the boss and the slot and the action of the connecting pin, which improves the usability of service and enables the rapid disassembly and assembly of the upper and lower receivers. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a cross-sectional view of the present invention;

[0024] Figure 3 This is an exploded view of the present invention;

[0025] Figure 4 This is a structural schematic diagram of the upper casing;

[0026] Figure 5 This is a structural diagram of the hand guard;

[0027] Figure 6 This is a schematic diagram of the connecting pin structure;

[0028] Figure 7 This is a schematic diagram of the limit pin spring;

[0029] Figure 8 This is a schematic diagram of the limit pin structure;

[0030] Figure 9 This is a structural schematic diagram of the lower casing;

[0031] Figure 10 This is a diagram showing the installation of the connecting pin.

[0032] Figure Labels

[0033] The invention will be further described below with reference to the accompanying drawings, in which: 1-upper casing, 2-handguard, 3-connecting pin, 4-limiting pin spring, 5-limiting pin, 6-lower casing; positioning groove 101, positioning boss 102, upper connecting pin hole 103, dovetail groove 104, dovetail boss 105, dovetail boss 201, dovetail groove 202, lower connecting pin hole 203, connecting pin limiting hole 204, cylindrical section 301, handle 302, rectangular limiting groove 303, arc-shaped limiting groove 304, limiting cone hole 305, mounting section 501, guide section 502, positioning section 503, positioning boss 601, connecting pin hole 602. Detailed Implementation

[0034] See Figures 1-10 A firearm upper and lower receiver connection mechanism includes an upper receiver, a handguard, a connecting pin, a limiting pin spring, a limiting pin, and a lower receiver.

[0035] The upper casing 1 is a cylinder structure. The rear end of the upper casing is provided with a positioning groove 101, the lower surface of the upper casing is provided with a positioning boss 102, the middle part of the upper casing is provided with support ears on both sides, the support ears are provided with upper connecting pin holes 103, the front end of the upper casing is provided with a dovetail groove 104, and the two outer sides of the front part of the upper casing are provided with dovetail bosses 105.

[0036] The handguard 2 has a U-shaped structure. Dovetail grooves 202 are provided on both inner sides of the handguard. A dovetail boss 201 is provided at the front end of the handguard. A lower connecting pin hole 203 is provided at the rear end of the handguard. A connecting pin limiting hole 204 is provided on the left side of the rear end of the handguard. The dovetail grooves 202 are combined with the dovetail boss 105 of the upper casing to assist in the vertical and horizontal positioning of the handguard. The dovetail boss 201 is combined with the dovetail groove 104 of the upper casing to position the handguard vertically and horizontally. The lower connecting pin hole 203 corresponds to the cylindrical section 301. The connecting pin limiting hole 204 is used to install the limiting pin spring 4 and the limiting pin 5.

[0037] The connecting pin 3 has an L-shaped structure and includes a cylindrical section 301 and a lever 302. The cylindrical section 301 has a rectangular limiting groove 303 along the axial direction and an arc-shaped limiting groove 304 along the circumferential direction. The arc-shaped limiting groove has a limiting conical hole 305. The lever 302 has an anti-slip groove on its outer surface. The cylindrical section 301 positions the handguard for forward and backward movement and positions the upper and lower housings. The lever 302 is used for disassembly and assembly. The rectangular limiting groove 303 limits the connecting pin axially and positions it circumferentially under the action of the limiting pin 5. The arc-shaped limiting groove 304 limits the connecting pin axially under the action of the limiting pin 5. The limiting conical hole 305 positions the connecting pin circumferentially under the action of the limiting pin 5.

[0038] The limiting pin spring 4 is used for reliable limiting of the limiting pin;

[0039] The limiting pin 5 is provided with an installation section 501, a guide section 502, and a positioning section 503 in sequence. The installation section 501 is used to guide the limiting pin spring 4. The guide section 502 is used to guide the movement of the limiting pin 5 in the connecting pin limiting hole 204 on the left side of the rear end of the handguard and to limit the axial movement of the connecting pin 3. The positioning section 503 is ball-headed and is used for circumferential positioning of the connecting pin 3.

[0040] The lower casing 6 has a positioning boss 601 at the rear end and a connecting pin hole 602 at the front end. The positioning boss 601 engages with the positioning groove 101 of the upper casing, and the connecting pin hole 602 is aligned with the connecting pin hole 103 on the upper casing. The upper and lower casings are connected and positioned under the action of the cylindrical section 301.

[0041] Assembly process:

[0042] The two inner dovetail grooves 202 of the handguard fit into the two outer dovetail bosses 105 at the front of the upper casing. The dovetail boss 201 at the front of the handguard is inserted into the dovetail groove 104 at the front of the upper casing. The lower connecting pin hole 203 at the rear of the handguard is aligned with the upper connecting pin holes 103 on both sides of the middle support lugs of the upper casing. The limiting pin spring 4 is installed in the connecting pin limiting hole 204 on the left side of the rear of the handguard. The limiting pin 5 is installed in the connecting pin limiting hole 204 on the left side of the rear of the handguard. The mounting section 501 is inserted into the limiting pin spring 4. The connecting pin 3 is inserted into the handguard 2 and the upper casing 1. The limiting pin 5 enters the rectangular... The lower casing has a positioning boss 601 at the rear end of the lower casing that engages with the positioning groove 101 at the rear end of the upper casing. The upper surface of the lower casing contacts the positioning boss 102 at the lower surface of the upper casing. The connecting pin hole 602 at the front end of the lower casing aligns with the upper connecting pin holes 103 on the two side lugs in the middle of the upper casing. The connecting pin 3 passes through the lower casing 6, the upper casing 1, and the handguard 2 in sequence to the inner side of the handle and contacts the side of the handguard. The connecting pin 3 rotates 90 degrees clockwise. The limiting pin 5 positions the connecting pin 3 circumferentially under the action of spring force. The limiting pin 5 positions the connecting pin axially through the arc-shaped limiting groove 304.

[0043] Usage process:

[0044] Connection: First, snap the lower casing rear end positioning boss 601 into the upper casing rear end positioning groove 101. Then rotate the lower casing so that the upper surface of the lower casing contacts the positioning boss 102 on the lower surface of the upper casing, and align the connecting pin hole 602 at the front end of the lower casing with the upper connecting pin holes 103 on the two side lugs in the middle of the upper casing. Next, press the connecting pin 3 so that it passes through the lower casing 6, the upper casing 1 and the handguard 2 in sequence until the inner side of the handle contacts the side of the handguard. Finally, rotate the connecting pin 3 clockwise 90 degrees to complete the connection of the upper and lower casings.

[0045] Disassembly: First, rotate the connecting pin 3 counterclockwise by 90 degrees, then pull out the connecting pin 3 until it is restricted by the limiting pin 5. Next, rotate the lower casing 6 around the rear positioning boss 601 until the front end of the lower casing is disengaged from the handguard 2. Finally, disengage the lower casing positioning boss 601 from the upper casing positioning groove 101, thus completing the disassembly of the upper and lower casings.

[0046] 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 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 to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A connecting mechanism for upper and lower receivers of a firearm, comprising an upper receiver, a handguard, and a lower receiver, characterized in that: The upper casing has lugs on both sides of the lower plane of the upper casing, and the lugs have upper connecting pin holes (103). The rear two walls of the handguard are provided with lower connecting pin holes (203) in the horizontal direction. The lower connecting pin holes (203) correspond to the upper connecting pin holes (103) on the upper casing. The rear end face of one side wall of the handguard is provided with a connecting pin limiting hole (204) in the longitudinal direction. The connecting pin limiting hole (204) is provided with a limiting pin (5) and a limiting pin spring (4). The front end of the lower casing is provided with a connecting pin hole (602), which corresponds to the upper connecting pin hole (103) and the lower connecting pin hole (203); It also includes a connecting pin, the connecting pin (3) including a cylindrical section (301) and a lever (302), the cylindrical section (301) and the lever (302) being perpendicular to each other to form an L-shape, the cylindrical section (301) having a rectangular limiting groove (303) along the axial direction, the cylindrical section (301) having an arc-shaped limiting groove (304) along the circumferential direction, the arc-shaped limiting groove (304) being located at one end of the cylindrical section (301) connecting to the lever (302), the rectangular limiting groove (303) and the arc-shaped limiting groove (304) being connected to form an L-shaped groove, the cylindrical section (301) of the connecting pin The limit pin (5) is used to be inserted into the upper connecting pin hole (103) of the upper casing, the lower connecting pin hole (203) of the handguard, and the connecting pin hole (602) of the lower casing for positioning. The end of the limit pin (5) is fitted in the L-shaped groove. The lever (302) is used to drive the cylindrical section (301) to move and rotate axially. When the limit pin (5) is located in the arc-shaped limit groove (304), the limit pin (5) limits the axial position of the connecting pin. When the limit pin (5) is located in the rectangular limit groove (303), the connecting pin (3) can move axially. The limit pin (5) limits the axial limit position of the connecting pin (3). The lower surface of the upper casing is provided with a dovetail groove (104) at the front, and the two outer sides of the front of the upper casing are provided with dovetail bosses (105). The inner sides of the two walls of the handguard (2) are provided with dovetail grooves (202). The dovetail grooves (202) are combined with the dovetail bosses (105) of the upper casing. The front end of the dovetail grooves (202) limits the front limit position of the dovetail bosses (105). The bottom wall of the handguard is provided with a dovetail boss (201) at the front, and the dovetail bosses (201) are combined with the dovetail grooves (104) of the upper casing. The upper casing has two dovetail-shaped protrusions (105) on the two outer sides of the front part, and the distance between the two dovetail-shaped protrusions (105) corresponds to the length of the dovetail groove (202) on the handguard (2); The upper casing has a positioning groove (101) on the inner side of its rear end, and the lower casing (6) has a lower positioning boss (601) on the outer side of its rear end. The lower positioning boss (601) is used to engage with the positioning groove (101) of the upper casing, and the positioning groove (101) can swing along the top of the lower positioning boss (601), so that the front end of the lower casing can rotate and swing relative to the upper casing along the top of the lower positioning boss (601). The upper casing has upper positioning bosses (102) on both sides of the lower plane rear portion. The upper positioning bosses (102) are used to contact and position with the upper plane of the lower casing.

2. The upper and lower receiver connecting mechanism of a firearm according to claim 1, characterized in that: The ends of the rectangular limiting groove (303) and the ends of the arc-shaped limiting groove (304) are respectively provided with limiting cone holes (305). The limiting cone holes (305) cooperate with the limiting pin (5) to limit the position of the connecting pin.

3. The upper and lower receiver connecting mechanism of a firearm according to claim 1, characterized in that: The outer surface of the lever (302) is provided with anti-slip grooves.

4. The upper and lower receiver connecting mechanism of a firearm according to claim 1, characterized in that: The limiting pin (5) is provided with an installation section (501), a guide section (502), and a positioning section (503) in sequence. The installation section (501) is used to fit the limiting pin spring (4). The guide section (502) is used to slide and guide the connecting pin limiting hole (204). The positioning section (503) is spherical and is used to position the connecting pin (3).

5. A method for assembling the upper and lower receiver connecting mechanism of a firearm as described in claim 1, characterized in that: The dovetail groove (202) of the handguard fits into the dovetail boss (105) of the upper casing, and the dovetail boss (201) of the handguard is inserted into the dovetail groove (104) of the upper casing. The lower connecting pin hole (203) of the handguard is aligned with the upper connecting pin hole (103) of the upper casing. The limiting pin spring (4) and the limiting pin (5) are sequentially installed into the connecting pin limiting hole (204) of the handguard. The connecting pin (3) is inserted into the handguard (2) and the upper casing (1). The limiting pin (5) enters the rectangular limiting groove (3) of the connecting pin under the action of the limiting pin spring (4). 03), the lower positioning boss (601) of the lower casing snaps into the positioning groove (101) of the upper casing, the connecting pin hole (602) of the lower casing is aligned with the upper connecting pin hole (103) of the upper casing, the connecting pin (3) passes through the lower casing (6), the upper casing (1) and the handguard (2) in sequence to the inner side of the handle and the side of the handguard, the connecting pin (3) rotates clockwise, the limiting pin (5) positions the connecting pin (3) circumferentially under the action of spring force, and the limiting pin (5) positions the connecting pin axially through the arc-shaped limiting groove (304).

6. A method of using the upper and lower receiver connecting mechanism of a firearm as described in claim 1, characterized in that: Connection: First, insert the lower positioning boss (601) of the lower casing into the positioning groove (101) of the upper casing at an angle. Then rotate the lower casing so that the upper surface of the lower casing contacts the positioning boss (102) on the lower surface of the upper casing, and the connecting pin hole (602) of the lower casing is aligned with the upper connecting pin hole (103) of the upper casing. Next, press the connecting pin (3) so that the connecting pin (3) passes through the lower casing (6), the upper casing (1) and the handguard (2) in sequence until the inner side of the handle contacts the side of the handguard. Finally, rotate the connecting pin (3) clockwise to complete the connection between the upper casing and the lower casing. Disassembly: First, rotate the connecting pin (3) counterclockwise, then pull out the connecting pin (3) until it is limited by the limiting pin (5). Next, rotate the lower casing (6) around the lower positioning boss (601) until the front end of the lower casing is disengaged from the handguard (2). Finally, disengage the lower positioning boss (601) of the lower casing from the positioning groove (101) of the upper casing, thus completing the disassembly of the upper casing and the lower casing.

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