Metal handguard fastening structure

Abstract

The utility model discloses a metal handguard fastening structure which can be provided with a standard Picatinny guide rail interface and prevent a metal handguard from loosening. Comprising a gun barrel, a section sleeve, a metal handguard, a handguard hoop, a fastening screw and an elastic cotter pin, the section sleeve and the handguard hoop are fixed to the gun barrel, a positioning cavity is formed in the lower end of the handguard hoop, a positioning head is arranged at the rear end of the metal handguard, the positioning head of the metal handguard is inserted into the positioning cavity of the handguard hoop, and axial positioning of the rear end of the metal handguard is formed; a threaded hole is vertically formed in the bottom of the section sleeve, a pin hole is vertically formed in the metal guard wood, a screw through hole is formed in the front end of the metal guard wood, the fastening screw penetrates through the screw through hole and is fixedly matched with the threaded hole in the section sleeve in a threaded mode, the fastening screw locks the front end of the metal guard wood, and a plurality of arc-shaped grooves are evenly formed in the circumferential face of the fastening screw. The elastic cotter pin penetrates through one arc-shaped groove and is inserted into the pin hole in the metal handguard to be positioned, and the elastic cotter pin locks the fastening screw.

Description

Technical Field

[0001] The utility model relates to the technical field of firearms, in particular to a metal handguard fastening structure. Background Art

[0002] With the development of contemporary light weapons and the change of war forms, light weapons are still indispensable equipment, and with the rapid development of optical sights and tactical accessories, the combat effectiveness of light weapons has been taken to a higher level. To add optical sights and tactical accessories, the mainstream now is to design a standard Picatinny rail interface on the rifle and machine gun.

[0003] However, for the traditional machine guns of the last century, almost none of them were designed with sights and tactical accessories installation interfaces. Only mechanical sights were designed, and the handguard was made of wood and fastened to the sleeve with screws. However, for the contemporary foreign trade market, almost all handguards are required to have a standard Picatinny rail interface for the installation of tactical accessories, which requires the wooden handguard to be replaced with a metal handguard. If the traditional single screw fastening method is still used, tests have shown that the handguard will loosen after firing hundreds of rounds of ammunition. After the handguard is loose, not only does it need special tools to be tightened again, but the effectiveness of the tactical accessories installed on it will also be reduced. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a metal handguard fastening structure that can be provided with a standard Picatinny rail interface and prevent the metal handguard from loosening.

[0005] The purpose of the utility model is achieved in this way:

[0006] A metal handguard fastening structure includes a gun barrel, a barrel sleeve, a metal handguard, a handguard hoop, a fastening screw, and an elastic split pin. The metal handguard is provided with a standard Picatinny rail interface, and the standard Picatinny rail interface is used for adding tactical accessories.

[0007] The section sleeve and the handguard hoop are fixed on the gun barrel respectively, the handguard hoop is located at the rear of the section sleeve, and an installation space for the metal handguard is formed between the section sleeve and the handguard hoop. A positioning cavity is provided at the lower end of the handguard hoop, and a positioning head is provided at the rear end of the metal handguard. The positioning head of the metal handguard is inserted into the positioning cavity of the handguard hoop to form axial positioning for the rear end of the metal handguard. A threaded hole is vertically provided at the bottom of the section sleeve, a pin hole is vertically provided on the metal handguard, and a screw through hole is provided at the front end of the metal handguard. The fastening screw passes through the screw through hole and is threadedly matched with the threaded hole on the section sleeve to be fixed. The fastening screw locks the front end of the metal handguard. A plurality of arc grooves are evenly provided on the circumferential surface of the fastening screw. The elastic cotter pin passes through one of the arc grooves and is inserted into the pin hole on the metal handguard for positioning. The elastic cotter pin locks the fastening screw.

[0008] Preferably, a protrusion is provided at the lower end of the section sleeve, and the lower end surface of the protrusion is the upper positioning surface. A slot is provided at the top of the front end of the metal handguard, and the bottom surface of the slot is the lower positioning surface. The slot of the metal handguard is engaged with the protrusion of the section sleeve, and the upper positioning surface and the lower positioning surface are fit and positioned.

[0009] Preferably, the positioning head at the rear end of the metal handguard is U-shaped, the positioning cavity of the handguard hoop is correspondingly configured to be U-shaped, and the handguard hoop is elastic.

[0010] Preferably, the section sleeve and the handguard hoop are respectively sleeved on the gun barrel, and the section sleeve, the handguard hoop and the gun barrel are locked by transverse pins.

[0011] Due to the adoption of the above technical solution, the utility model has the following beneficial effects:

[0012] The utility model is suitable for machine guns with metal handguard connection mode, so that the problem of loosening and falling off of the metal handguard caused by loose screws can be solved. The structure has been verified by experiments, and the mechanism is simple and reliable. The experiment shows that after using the structure, in the test of 10,000 rounds of the whole gun life, the metal handguard can be tightly connected to the gun during the whole process without loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 It is a cross-sectional schematic diagram of the installation location of the fastening screw and the elastic cotter pin;

[0015] Figure 3 yes Figure 1 Schematic diagram from top view;

[0016] Figure 4 It is a structural diagram of the node sleeve;

[0017] Figure 5 It is a schematic diagram of the structure of the fastening screw;

[0018] Figure 6 It is a schematic diagram of the structure of the metal handguard;

[0019] Figure 7 It is a schematic diagram of the structure of an elastic cotter pin.

[0020] Figure 8 It is a schematic diagram of the structure of the wood guard hoop.

[0021] Reference numerals

[0022] In the accompanying drawings, 1 is a sleeve, 101 is a threaded hole, 102 is an upper positioning surface; 2 is a gun barrel, 3 is a fastening screw, 301 is an arc groove, 302 is a threaded surface of the fastening screw; 4 is a metal handguard, 401 is a screw through hole, 402 is a pin hole, 403 is a left and right positioning surface of the slot (the lower positioning surface is located between the left and right positioning surfaces); 5 is a handguard hoop; 6 is an elastic cotter pin, and 601 is a cylindrical surface of the elastic cotter pin. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0024] See also Figure 1-Figure 8 An embodiment of a metal handguard fastening structure includes a gun barrel 2, a section sleeve 1, a metal handguard 4, a handguard hoop 5, a fastening screw 3, and an elastic cotter pin 6. The metal handguard 4 is provided with a standard Picatinny rail interface, and the standard Picatinny rail interface is used for installing tactical accessories.

[0025] The section sleeve 1 and the handguard hoop 5 are fixed on the gun barrel 2 respectively. In this embodiment, the section sleeve 1 and the handguard hoop 5 are respectively sleeved on the gun barrel 2, and the section sleeve 1, the handguard hoop 5 and the gun barrel 2 are locked by transverse pins. The guard hoop 5 is located at the rear of the section sleeve 1, and an installation space for the metal guard 4 is formed between the section sleeve 1 and the guard hoop 5. A positioning cavity is provided at the lower end of the guard hoop 5, and a positioning head is provided at the rear end of the metal guard 4. The positioning head of the metal guard 4 is inserted into the positioning cavity of the guard hoop 5 to form axial positioning for the rear end of the metal guard 4. A threaded hole 101 is vertically provided at the bottom of the section sleeve 1, a pin hole 402 is vertically provided on the metal guard, and a screw through hole 401 is provided at the front end of the metal guard 4. The fastening screw 3 passes through the screw through hole 401 and is threadedly fixed with the threaded hole 101 on the section sleeve 1. The fastening screw 3 locks the front end of the metal guard 4. A plurality of arc grooves 301 are evenly provided on the circumferential surface of the fastening screw 3. The elastic cotter pin 6 passes through one of the arc grooves and is inserted into the pin hole 402 on the metal guard for positioning. The elastic cotter pin 6 locks the fastening screw 3.

[0026] A protrusion is provided at the lower end of the section sleeve 1, and the lower end surface of the protrusion is the upper positioning surface 102. A slot is provided at the top of the front end of the metal guard 4, and the bottom surface of the slot is the lower positioning surface. The slot of the metal guard 4 is engaged with the protrusion of the section sleeve 1, and the upper positioning surface 102 and the lower positioning surface are fitted and positioned.

[0027] The positioning head at the rear end of the metal guard is U-shaped, the positioning cavity of the guard hoop is correspondingly set to be U-shaped, and the guard hoop is elastic. The metal guard also has a certain elasticity, so that the metal guard 4 can be elastically moved (the guard hoop or the metal guard is elastically deformed) and adjusted.

[0028] Specific installation method:

[0029] After the barrel has been equipped with the sleeve and the handguard hoop, it is only necessary to insert the positioning head of the metal handguard 4 into the positioning cavity of the handguard hoop 5, and then adjust the front end position of the metal handguard, align the screw through hole 401 of the metal handguard 4 with the threaded hole 101 of the sleeve 1, and fit the lower positioning surface on the metal handguard 4 with the upper positioning surface on the sleeve 1. Then, tighten the fastening screw 3 with a flat screwdriver, and the tightening torque is not less than 2.5Nm, until one of the arc grooves 301 on the fastening screw 3 is aligned with the pin hole 402 on the metal handguard 4, and then install the elastic cotter pin. At this time, half of the elastic cotter pin is matched with the pin hole 402 of the metal handguard 4, and the other half is stuck on the arc groove of the fastening screw. At this time, it is ensured that the fastening screw 3 will not rotate, and the fastening screw will not rotate and loosen, and the metal handguard 4 can be ensured not to loosen and fall off under the joint action of the fastening screw and the handguard hoop. This also ensures that the tactical accessories installed on the Picatinny rail of the metal handguard can exert their effectiveness.

[0030] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model 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 utility model.

Claims

1. A metal handguard fastening structure, comprising a gun barrel and a sleeve, characterized in that: It also includes a metal handguard, a handguard hoop, fastening screws, and an elastic split pin. The metal handguard is provided with a standard Picatinny rail interface, which is used to install tactical accessories. The section sleeve and the handguard hoop are fixed on the gun barrel respectively, the handguard hoop is located at the rear of the section sleeve, and an installation space for the metal handguard is formed between the section sleeve and the handguard hoop. A positioning cavity is provided at the lower end of the handguard hoop, and a positioning head is provided at the rear end of the metal handguard. The positioning head of the metal handguard is inserted into the positioning cavity of the handguard hoop to form axial positioning for the rear end of the metal handguard. A threaded hole is vertically provided at the bottom of the section sleeve, a pin hole is vertically provided on the metal handguard, and a screw through hole is provided at the front end of the metal handguard. The fastening screw passes through the screw through hole and is threadedly matched with the threaded hole on the section sleeve to be fixed. The fastening screw locks the front end of the metal handguard. A plurality of arc grooves are evenly provided on the circumferential surface of the fastening screw. The elastic cotter pin passes through one of the arc grooves and is inserted into the pin hole on the metal handguard for positioning. The elastic cotter pin locks the fastening screw.

2. A metal guard fastening structure according to claim 1, characterized in that: A protrusion is provided at the lower end of the section sleeve, and the lower end surface of the protrusion is the upper positioning surface. A slot is provided at the top of the front end of the metal handguard, and the bottom surface of the slot is the lower positioning surface. The slot of the metal handguard is engaged with the protrusion of the section sleeve, and the upper positioning surface and the lower positioning surface are fit and positioned.

3. The metal guard fastening structure according to claim 1, characterized in that: The positioning head at the rear end of the metal handguard is U-shaped, the positioning cavity of the handguard hoop is correspondingly set to be U-shaped, and the handguard hoop is elastic.

4. The metal guard fastening structure according to claim 1, characterized in that: The section sleeve and the handguard hoop are respectively mounted on the gun barrel, and the section sleeve, the handguard hoop and the gun barrel are locked by transverse pins.

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