A bolt carrier setback to position impact mechanism

Abstract

This invention discloses a bolt carrier recoil-to-position impact mechanism that transfers the impact of the bolt carrier recoil-to-position to the barrel assembly. It includes a receiver (6), within which a barrel (1), a sleeve (2), and a bolt carrier (4) are housed. The tail of the barrel (1) is fixedly connected to the sleeve (2) to form the barrel assembly. The bolt carrier (4) can move back and forth along the receiver (6). A special groove (4-1) is provided at the front end of the bolt carrier (4), and an impact block (3) is installed within the special groove (4-1). The upper end of the impact block (3) extends upward from the special groove (4-1) and forms an impact surface (3-3). An impact protrusion (2-1) is provided at the bottom of the sleeve (2). When the bolt carrier (4) recoils to its extreme position, the impact surface (3-3) of the impact block (3) directly abuts against the impact protrusion (2-1) of the sleeve (2), rigidly transmitting the recoil impact force to the barrel assembly, which then bears the impact force.

Description

Technical Field

[0001] This invention relates to the field of firearms technology, and in particular to a bolt carrier recoil-to-position impact mechanism. Background Technology

[0002] The bolt carrier is a crucial and commonly used mechanism in firearms, and handling the impact of its recoil has always been a challenge in firearm design. Some firearms reinforce the overall structure, using components like the receiver to rigidly withstand the recoil impact. This approach is simple but increases the firearm's weight, hindering weight reduction efforts. Other firearms use springs or hydraulic buffers behind the bolt carrier to absorb the recoil impact. This is a common method, but space constraints limit the buffer's size, making it difficult to effectively absorb the impact. Furthermore, buffers are often complex and unreliable. Some firearms increase the bolt carrier's travel, allowing it to decelerate slowly to zero under spring pressure, thus avoiding impact. However, this excessively reduces the rate of fire and significantly increases the firearm's length, compromising its compactness. The barrel mechanism is one of the strongest components in a firearm. It is generally shaped like a thick-walled steel tube and made of high-quality materials, possessing good impact resistance and strength. Some firearms also incorporate sophisticated buffer mechanisms within their barrel mechanisms. Transferring the impact of the bolt carrier recoil to the barrel mechanism would significantly simplify firearm design and greatly enhance its practicality. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a bolt carrier recoil-in impact mechanism that transfers the impact of the bolt carrier recoil-in to the barrel assembly.

[0004] The objective of this invention is achieved as follows: A bolt carrier recoil-to-position impact mechanism includes a receiver (6), a barrel (1), a sleeve (2), and a bolt carrier (4) inside the receiver (6). The tail of the barrel (1) is fixedly connected to the sleeve (2) to form a barrel assembly. The bolt carrier (4) can move back and forth along the receiver (6). A special groove (4-1) is provided at the front end of the bolt carrier (4). An impact block (3) is installed in the special groove (4-1). The upper end of the impact block (3) extends upward out of the special groove (4-1) and forms an impact surface (3-3). An impact protrusion (2-1) is provided at the bottom of the sleeve (2). The special groove (4-1) is a mounting groove (of a specific shape) used to mount the positioning impact block (3).

[0005] When the bolt carrier (4) recoils to its limit position, the impact surface (3-3) of the impact block (3) directly abuts against the impact protrusion (2-1) of the sleeve (2), rigidly transmitting the recoil impact force to the barrel assembly, and using the barrel assembly to bear the impact force.

[0006] Preferably, the special groove (4-1) is a side-opening structure (open on the left side for inserting and installing the impact block (3), and the right side is provided with an insertion hole corresponding to the top head (5-1). Of course, it can also be open on both sides). The special groove (4-1) is L-shaped and its horizontal section extends forward. The shape of the impact block (3) corresponds to the special groove (4-1), forming a vertical limit on the impact block (3). The upper wall of the front end of the special groove (4-1) is a bearing surface.

[0007] Preferably, a recoil spring guide rod (5) is mounted in the bolt carrier (4) along the longitudinal direction (front and rear direction) (a recoil spring hole (4-2) is opened at the front end of the bolt carrier (4), and the recoil spring guide rod (5) is inserted into the recoil spring hole (4-2). The recoil spring guide rod (5) is used to assemble the recoil spring, which is the same as the prior art and will not be described again here). The outer circular surface of the front part of the recoil spring guide rod (5) serves as the constraint surface (5-2). The bottom of the impact block (3) is provided with a curved limiting circle (3-2). The constraint surface (5-2) of the recoil spring guide rod (5) is inserted into the limiting circle (3-2) of the impact block (3) to form a lateral (left and right direction) positioning of the impact block (3).

[0008] Preferably, the lower part of the front end of the impact block (3) is a semi-circular rotating shaft (3-1), the turning point of the front end of the impact block (3) is arc-shaped, and the semi-circular rotating shaft (3-1), the turning point and the front end wall of the special groove (4-1) of the impact block (3) form a rotating pair fit. When the bolt carrier (4) recoils to its limit position, the semi-circular pivot (3-1) guides the impact block (3) to produce an adaptive deflection (due to elastic deformation, a small amount of which is generated), converting the destructive shear force into compressive stress on the bearing surface (4-3).

[0009] Preferably, the casing (6) is provided with a disassembly groove (6-1) and a top hole (6-2) on both sides corresponding to the impact block (3), and the front end of the recoil spring guide rod (5) is provided with a top head (5-1). During maintenance, the top hole (6-2) is used to insert the top head (5-1) of the recoil spring guide rod (5), and the disassembly groove (6-1) is used to push out the impact block (3). Without removing the barrel structure, the bolt carrier (4) can be pulled out and disassembled.

[0010] Preferably, the strength of the barrel assembly and the impact block (3) is higher than that of the bolt carrier (4), and the impact block (3) can be designed with multiple spare parts to enhance the service life of the impact mechanism.

[0011] Preferably, the barrel assembly includes a buffer mechanism.

[0012] Due to the adoption of the above technical solution, the present invention has the following beneficial effects: The bolt carrier recoil-to-position impact mechanism has the advantages of regular shape, simple structure and high strength. It can solve the problem of bolt carrier recoil-to-position impact without increasing the weight, length and complexity of the firearm, and does not affect the normal disassembly and assembly of the firearm, and has good practicality. Attached Figure Description

[0013] Figure 1 This is an exploded view of the present invention; Figure 2 This is an assembly diagram of the present invention; Figure 3 This is a schematic diagram of the impact block structure of the present invention; Figure 4 This is a schematic diagram of the bolt carrier structure of the present invention; Figure 5 This is a schematic diagram of the bolt carrier, impact block, and their engagement and stress distribution according to the present invention. Figure 6 This is a schematic diagram of the recoil spring guide rod and its cooperation with the impact block of the present invention; Figure 7 This is a schematic diagram of the casing structure of the present invention; Figure 8 This is a schematic diagram of the fitting relationship during the disassembly of the firearm of the present invention; Figure 9 This is a schematic diagram of the barrel and sleeve structure of the present invention; Figure 10 This is a schematic diagram of the impact and disassembly state of the firearm according to the present invention. Detailed Implementation

[0014] A bolt carrier recoil-to-position impact mechanism is disclosed. This mechanism includes an impact block mounted at the front of the bolt carrier. When the bolt carrier recoils to its final position, the impact block impacts a protrusion on the bolt carrier. If the barrel mechanism remains stationary, its inherent strength can withstand the impact. If the barrel has a buffer mechanism, the bolt carrier and barrel can recoil together for cushioning. This mechanism avoids the drawbacks of traditional methods, such as increased weight, increased length, poor buffering effect, and complex structure. Furthermore, the impact mechanism of this invention is easy to assemble and disassemble, achieving its function without increasing the number of parts in the firearm, and does not affect the normal assembly and disassembly sequence of the firearm. It possesses the advantages of simple structure, high strength, and strong practicality.

[0015] The bolt carrier features a specially shaped groove and a recoil spring hole at the front. After the impact block is inserted into the groove, the recoil spring guide rod is inserted into the recoil spring hole and the limiting circle of the impact block in the bolt carrier to position it. When the bolt carrier recoils to its final position, the impact block collides with the impact protrusion on the receiver, transferring the impact to the barrel. When disassembling the firearm, the recoil spring guide rod must first be removed. Using the guide rod as a tool, it is inserted through the top hole of the receiver, and the impact block is held in place by the receiver's disassembly slot. The bolt carrier can then be removed normally without being affected by the impact protrusion. The shape of the impact block and the groove in the bolt carrier are optimized for good strength and lifespan.

[0016] To make the objectives, technical solutions, and inventive features of this invention clearer, the invention will be described in further detail below with reference to the accompanying drawings.

[0017] like Figure 1 The diagram shows a bolt carrier recoil-to-position impact mechanism, which includes components such as a barrel 1, a sleeve 2, an impact block 3, a bolt carrier 4, a recoil spring guide rod 5, and a receiver 6.

[0018] like Figure 2 The image shows a bolt carrier recoil-to-position impact mechanism. After assembly, it is shown in the figure. The receiver will cover most of the components, so a view with the receiver hidden is added.

[0019] like Figure 3 As shown, the impact block 3 is designed with a semi-circular rotating shaft 3-1, a limiting circle 3-2, and an impact surface 3-3. The semi-circular rotating shaft 3-1 can prevent incorrect installation direction. The limiting circle 3-2 and the semi-circular rotating shaft 3-1 cooperate with the recoil spring guide rod 5 and the bolt carrier 4, respectively, to position and constrain the impact block 3. The impact surface 3-3 is used to directly bear the impact.

[0020] like Figure 4 As shown, the bolt carrier 4 is designed with a special-shaped groove 4-1 and a recoil spring hole 4-2. The special-shaped groove 4-1 does not penetrate through the bolt carrier 4, thus preserving the strength of the bolt carrier 4 as much as possible. The recoil spring hole 4-2 is used to mate with the recoil spring guide rod 5. A pressure-bearing surface 4-3 is designed inside the special-shaped groove 4-1.

[0021] like Figure 5 As shown, after the impact block 3 is installed into the bolt carrier 4, if the impact surface 3-2 is subjected to an arrow-shaped impact, the semi-circular pivot 3-1 and the special-shaped groove 4-1 can form an effect similar to a pivot, allowing the impact block 3 to rotate slightly, thereby pressing the bearing surface 4-3 and converting the shear force generated by the impact into pressure. The tensile and compressive strength of metal parts is often several times their shear strength. The above mechanism can utilize the properties of metal to optimize the stress on the impact block 3 and the bolt carrier 4 and increase their service life.

[0022] like Figure 6As shown, the recoil spring guide rod 5 is designed with a top head 5-1 and a constraint surface 5-2. The constraint surface 5-2 can cooperate with the impact block limiting circle 3-2 and the recoil spring hole 4-2 of the bolt carrier to play a constraint role, thereby positioning the impact block 3. The top head 5-1 can hold the impact block 3 in place when the firearm is disassembled.

[0023] like Figure 7 As shown, the receiver 6 is designed with a disassembly slot 6-1 and a top hole 6-2. The disassembly slot 6-1 is similar in shape to the impact block 3, but slightly larger than the impact block 3. The top hole 6-2 mates with the recoil spring guide rod constraint surface 5-2. When disassembling the firearm, the recoil spring guide rod 5 can be inserted into the top hole 6-2 and push out the impact block 3.

[0024] like Figure 8 As shown, when disassembling the firearm, the recoil spring guide rod 5 can be inserted into the top hole 6-2 and the impact block 3 can be pushed out. The shape of the top head 5-1 is exactly matched with the shape of the impact block 3 and the bolt carrier 4, which can hold the impact block 3 in place.

[0025] like Figure 9 As shown, the barrel 1 and the sleeve 2 form the barrel assembly of the firearm, and the sleeve 2 has an impact protrusion 2-1 designed below it.

[0026] like Figure 10 As shown in the diagram, the positions of the barrel 1 and the sleeve 2 remain unchanged. When the bolt carrier recoils, i.e., moves from left to right as shown in the diagram, the impact surface 3-2 of the impact block will collide with the impact protrusion 2-1 of the sleeve. When disassembling the firearm, after removing the impact block 3, the bolt carrier can be pulled out from front to back, i.e., from left to right as shown in the diagram, without being affected by the impact protrusion 2-1 of the sleeve.

[0027] The bolt carrier is a crucial and common component in firearm design. During recoil, it carries energy, often resulting in a significant impact upon completion of the recoil motion. This impact frequently has a negative effect on the firearm. Traditional firearms typically compensate for this impact by increasing weight and structural strength to rigidly withstand the recoil, or by increasing complexity by using springs or hydraulic buffers to cushion and absorb the impact. The barrel assembly is one of the strongest components in a firearm, and some firearms already incorporate sophisticated buffering mechanisms. This invention discloses a novel bolt carrier impact mechanism that uses an impact block to transfer the recoil impact of the bolt carrier to the barrel assembly. This avoids the need for additional weight reinforcement, buffer design, or utilizing the barrel's built-in buffering mechanism, offering high manufacturability and functionality.

[0028] 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 bolt carrier recoil-to-position impact mechanism, comprising a receiver (6), wherein a barrel (1), a sleeve (2), and a bolt carrier (4) are disposed within the receiver (6), the tail of the barrel (1) is fixedly connected to the sleeve (2) to form a barrel assembly, and the bolt carrier (4) is capable of moving back and forth along the receiver (6), characterized in that: The front end of the bolt carrier (4) is provided with a special groove (4-1), and an impact block (3) is installed in the special groove (4-1). The upper end of the impact block (3) extends upward out of the special groove (4-1) and forms an impact surface (3-3). The bottom of the sleeve (2) is provided with an impact protrusion (2-1). When the bolt carrier (4) recoils to its limit position, the impact surface (3-3) of the impact block (3) directly abuts against the impact protrusion (2-1) of the sleeve (2), rigidly transmitting the recoil impact force to the barrel assembly, and using the barrel assembly to bear the impact force.

2. The bolt carrier recoil-to-position impact mechanism according to claim 1, characterized in that: The special groove (4-1) is L-shaped and its horizontal section extends forward. The shape of the impact block (3) corresponds to the special groove (4-1), forming a vertical limit on the impact block (3). The upper wall of the front end of the special groove (4-1) is a bearing surface.

3. The bolt carrier recoil-to-position impact mechanism according to claim 2, characterized in that: The bolt carrier (4) is fitted with a recoil spring guide rod (5) along the longitudinal direction. The outer circular surface of the front part of the recoil spring guide rod (5) serves as a constraint surface (5-2). The bottom of the impact block (3) is provided with an arc-shaped limiting circle (3-2). The constraint surface (5-2) of the recoil spring guide rod (5) is inserted into the limiting circle (3-2) of the impact block (3) to form a lateral positioning of the impact block (3).

4. The bolt carrier recoil-to-position impact mechanism according to claim 2, characterized in that: The lower front end of the impact block (3) is a semi-circular rotating shaft (3-1), and the turning point of the front end of the impact block (3) is arc-shaped. The semi-circular rotating shaft (3-1) and the turning point of the impact block (3) form a rotating pair with the front wall of the special groove (4-1). When the bolt carrier (4) recoils to its limit position, the semi-circular pivot (3-1) guides the impact block (3) to produce an adaptive deflection, converting the destructive shear force into compressive stress on the bearing surface (4-3).

5. The bolt carrier recoil-to-position impact mechanism according to claim 2, characterized in that: The casing (6) is provided with a disassembly groove (6-1) and a top hole (6-2) on both sides corresponding to the impact block (3), and the front end of the recoil spring guide rod (5) is provided with a top head (5-1). During maintenance, the top hole (6-2) is used to insert the top head (5-1) of the recoil spring guide rod (5), and the disassembly groove (6-1) is used to eject the impact block (3).

6. The bolt carrier recoil-to-position impact mechanism according to claim 1, characterized in that: The strength of the barrel assembly and the impact block (3) is higher than that of the bolt carrier (4).

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