A double-spring rotary lock folding knife

Abstract

This invention discloses a double-spring twist-lock folding knife, comprising a blade and a retaining sleeve. A side end plate is provided on each side of the blade, and an upper end plate is connected between the upper ends of the side end plates. The retaining sleeve is formed between the side end plates and the upper end plate and is slidably disposed outside the blade. A large handle and a small handle are provided on one side of the blade's cutting edge. The front end of the retaining sleeve is hinged to the front end of the large handle, and the rear end of the large handle is hinged to the front end of the small handle. The rear end of the small handle is hinged to the tail end of the blade. A first groove and a second groove are respectively provided on the large and small handles to accommodate the blade. The first and second grooves can connect to form a linear storage groove, allowing the blade to be completely embedded in the storage groove. The large and small handles can be embedded in the retaining sleeve, and the large handle can be embedded in the second groove of the small handle to form a combined handle. The knife features a torsion spring-driven rocker-slider mechanism for convenient blade extension and retraction, and a spring-loaded gear meshing mechanism for opening and closing positioning.

Description

Technical Field

[0001] This invention relates to a folding knife, and more specifically, to a double-spring twist-lock folding knife, belonging to the field of folding knives. Background Technology

[0002] A folding knife is a type of portable knife for daily use. Most folding knives on the market have a handle with a pivot assembly at the front end into which the blade can be screwed. Current technological innovations in folding knives generally fall into the following categories: 1. Knife opening and locking mechanism. Examples include: "Knife Blade Opening Mechanism" (application number CN200880021621.0); "Folding Knife with Opening Mechanism" (application number CN201310036330.1); "Folding Knife with Back Spring Adjustment Mechanism" (application number CN202111535484.6); "Assisted Folding Knife" (application number CN201611258561.7); "Assisted Folding Knife" (application number CN201510835931.8); "Folding Knife" (application number CN201510593476.5); "Folding Knife" (application number CN202010847055.1); "Folding Knife" (application number CN201110437211.8); and "Folding Knife" (application number CN201710735948.5). 2. Locking Auxiliary Device. Examples include: "Safety Device for an Integrated Wire Lock Folding Knife" (application number CN201510794796.7); "Safety Device for a Plunger Lock Folding Knife" (application number CN201510794672.9); "A Folding Knife with Reinforced Stop" (application number CN201610772209.9); "A Folding Knife" (application number CN201610244336.1); and "A Folding Knife with a Button-Unlocked Spring Arm" (application number CN201711434012.5). 3. Replaceable blade structure. Examples include "A High-Efficiency and Safe Folding Knife with Automatic Blade Changing Function" (application number CN202110393002.1), "A Folding Knife Easy to Unlock" (application number CN202010298409.1), "Assisted Folding Knife" (application number CN201510025647.4), "Folding Knife Head and Folding Knife" (application number CN201410199721.X), and "Cutting Tool" (application number CN201110391334.2).

[0003] The technical examples listed above all employ a traditional structure where the blade and handle are connected by a pivot. In this traditional structure, the handle and blade are of equal or slightly larger length, which can lead to difficulties in certain environments, such as confined spaces or areas with easily scratched materials, making it impossible to open the knife or resulting in failed opening attempts. Furthermore, the requirement for linear blade movement during opening cannot be met. Additionally, when the blade is long, the handle occupies a significant amount of space when the knife is open, causing inconvenience in some situations. Therefore, developing a product that meets these requirements would effectively fill the technological gap in existing folding knives, possessing significant social and commercial value. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a double-spring rotary lock folding knife that features a torsion spring-driven rocker slider mechanism for convenient knife extension and retraction, and a compression spring gear meshing mechanism for opening and closing positioning.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0006] A double-spring twist-lock folding knife includes a blade and a retaining sleeve. A side end plate is provided on each side of the blade, and an upper end plate is connected between the upper ends of the side end plates. The side end plates and the upper end plate form a retaining sleeve, which is slidably disposed outside the blade. A large handle and a small handle are provided on one side of the blade's cutting edge. The front end of the retaining sleeve is hinged to the front end of the large handle, and the rear end of the large handle is hinged to the front end of the small handle. The rear end of the small handle is hinged to the tail end of the blade. A first groove and a second groove are respectively provided on the large handle and the small handle to accommodate the blade. The first and second grooves can connect to form a linear storage groove, allowing the blade to be completely embedded in the storage groove. The large and small handles can be embedded in the retaining sleeve, and the large handle can be embedded in the second groove of the small handle to form a combined handle.

[0007] When the retaining sleeve is wrapped around the front end of the blade, the blade is fully embedded in the storage groove and the large handle is embedded in the retaining sleeve; when the large handle is embedded in the second groove of the small handle to form a handle, the retaining sleeve can cooperate with the handle to lock in place.

[0008] Preferably, a limiting block is connected to the inner side of the side end plate, and a linear groove is formed on the outer side of the blade, with the limiting block slidably disposed in the groove.

[0009] Preferably, the large handle includes two symmetrically arranged side plates, a first side plate and a second side plate, with a lower side plate connecting the first side plate and the second side plate, and the first side plate, the second side plate and the lower side plate forming a first groove.

[0010] The small handle includes two symmetrically arranged side plates, number three and number four, with an upper side plate connecting the two side plates. The three side plates, number four, and upper side plate form a second groove. The upper side plate has a recessed area with several protrusions. The upper end plate of the retaining sleeve has several slots. When the small handle is fully embedded in the retaining sleeve, the protrusions are respectively engaged in different slots for fixation.

[0011] Preferably, the first side plate and the second side plate are located on the inner side of the side end plate and are respectively hinged to the front end of the side end plate.

[0012] The first side plate and the second side plate are located on the inner sides of the third side plate and the fourth side plate, respectively, and are hinged to the front ends of the third side plate and the fourth side plate, respectively.

[0013] The third and fourth side plates are located on both sides of the blade 1 and are hinged to the tail end of the blade.

[0014] Preferably, the front end of the retaining sleeve is hinged to the front end of the large handle by a large handle fastener, and the rear end of the small handle is hinged to the tail end of the blade by a blade fastener.

[0015] Preferably, the first side plate and the third side plate, as well as the second side plate and the fourth side plate, are hinged by an operating lever mechanism; the operating lever mechanism includes a circular column, a large gear plate, a first annular groove, a second annular groove, a cylindrical groove, and a control pressure part;

[0016] A first annular groove is formed on the outer surface of the first side plate and the second side plate. A receiving groove is recessed on the inner surface of the first side plate and the second side plate, and the receiving groove protrudes from the middle of the first annular groove to form a circular column. An installation hole is formed on the circular column. A large circular toothed disc is placed in the receiving groove, and the tooth surface of the large toothed disc faces outward from the receiving groove.

[0017] The inner surfaces of the No. 3 and No. 4 side plates are provided with a No. 2 annular groove. The middle part of the No. 2 annular groove is provided with a cylindrical groove. A circular hole is provided in the cylindrical groove by passing through the No. 3 and No. 4 side plates. A large toothed disc is also provided in the cylindrical groove, and the tooth surface of the large toothed disc in the cylindrical groove is set to face outward of the cylindrical groove.

[0018] The control pressure unit is connected to an operating rod. From the outside to the inside, the operating rod is sequentially provided with a circular hole and a mounting hole. The first and second annular grooves are rotatably assembled to form a first space. The cylindrical groove and the top surface of the circular cylinder are rotatably assembled to form a second space. A torsion spring is provided in the first space, and the two ends of the torsion spring are respectively connected to the first and second annular grooves. The first and second lower gear discs of the same size are respectively sleeved on the operating rod in the second space and the receiving groove. The first and second lower gear discs are adapted to the large gear disc to achieve contact and engagement. A compression spring is connected between the second lower gear disc and the bottom of the receiving groove and is sleeved on the operating rod. The compression spring pulls the second lower gear disc so that the first lower gear disc on the operating rod contacts and engages with the large gear disc in the cylindrical groove, and the second lower gear disc contacts and engages with the large gear disc in the receiving groove to fix the included angle between the large and small handles.

[0019] Preferably, the edges of the first side plate and the second side plate are respectively provided with clearance grooves, so that when the large arm is embedded in the retaining sleeve, the limiting block can be embedded in the clearance groove for clearance.

[0020] Beneficial effects: Compared to existing folding knives, this invention uses a torsion spring-driven rocker-slider mechanism to change the traditional flip-type opening method to a telescopic opening method, making it safer and more convenient to use. Compared to the traditional folding knife structure, the torsion spring-driven rocker-slider mechanism achieves more convenient knife extension and retraction actions, and also features a small handle structure after opening, which is more advantageous for carrying and using longer blades. Compared to the traditional locking structure, the pressure spring toothed disc locking structure achieves controllable locking of the opening angle between the large and small handles, and also simultaneously achieves controllable locking of the knife extension length. This knife has a simple structure, is easy to manufacture, and is easy to mass-produce and market, possessing good market and social value. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the disassembled structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the structure of the present invention in its stored state.

[0023] Figure 3 This is a schematic diagram of the opening process 1 of the present invention.

[0024] Figure 4 This is a schematic diagram of the opening process 2 of the present invention.

[0025] Figure 5 This is a schematic diagram of the opening process 3 of the present invention.

[0026] Figure 6 This is a schematic diagram of the structure of the present invention in its fully open state.

[0027] Figure 7This is a detailed structural schematic diagram of the double-spring toothed disc rotary lock mechanism of the present invention.

[0028] Figure 8 This is a cross-sectional view of the locked state of the double-spring toothed disc rotary lock mechanism of the present invention.

[0029] Figure 9 This is a cross-sectional view of the double-spring toothed disc rotary lock mechanism of the present invention in its open to maximum stroke state.

[0030] Figure 10 This is a schematic diagram of the limiting block in use state 1 of the present invention.

[0031] Figure 11 This is a schematic diagram of the limiting block in use state 2 of the present invention. Detailed Implementation

[0032] The following will refer to the appendices in the embodiments of the present invention. Figure 1-11 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of the invention, it should be noted that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0034] In the description of the invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an indirect connection through an intermediate medium, but the connections at various points do not affect the multi-position folding of this application. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] The ingenuity of this invention lies in changing the traditional flip-type cutting method to a telescopic cutting method using a spring-loaded toothed disc to control a torsion spring-driven rocker slider mechanism, which can be locked at different cutting lengths, making it simpler and more convenient to use.

[0036] This invention discloses a double-spring twist-lock folding knife, comprising a blade 1 and a retaining sleeve 2. A side end plate is provided on each side of the blade 1, and an upper end plate is connected between the upper ends of the side end plates. The side end plates and the upper end plate form the retaining sleeve 2, which is slidably disposed outside the blade 1. A large handle 3 and a small handle 4 are provided on one side of the blade edge of the blade 1. The front end of the retaining sleeve 2 is hinged to the front end of the large handle 3, and the rear end of the large handle 3 is hinged to the front end of the small handle 4. The rear end of the small handle 4 is hinged to the tail end of the blade 1. A groove is respectively formed on the large handle 3 and the small handle 4. The second slot is designed to accommodate the blade 1. The first and second slots are connected to form a linear storage slot, allowing the blade 1 to be fully embedded in the storage slot. The large handle 3 and the small handle 4 are embedded in the retaining sleeve 2, and the large handle 3 is embedded in the second slot of the small handle 4 to form a handle. When the retaining sleeve 2 is wrapped around the front end of the blade 1, the blade 1 is fully embedded in the storage slot and the large handle 3 is embedded in the retaining sleeve 2. When the large handle 3 is embedded in the second slot of the small handle 4 to form a handle, the retaining sleeve 2 can engage and lock with the handle.

[0037] The first side plate 1.0 and the third side plate 3.0, as well as the second side plate 2.0 and the fourth side plate 4.0, are hinged by an operating lever mechanism. The operating lever mechanism includes a circular column 3.2, a large gear plate 3.4, a first annular groove 3.3, a second annular groove 4.3, a cylindrical groove 4.4, and a control pressure part 7. A first annular groove 3.3 is formed on the outer surface of both the first side plate 1.0 and the second side plate 2.0. A receiving groove is recessed on the inner surface of both the first side plate 1.0 and the second side plate 2.0, protruding beyond the center of the first annular groove 3.3 to form a circular column 3.2. The circular column 3.2 has a mounting hole, and a large circular toothed disc 3.4 is placed in the receiving groove, with the tooth surface of the large toothed disc 3.4 facing outward from the receiving groove. The inner surfaces of the third side plate 3.0 and the fourth side plate 4.0 have a second annular groove 4.3, and a cylindrical groove 4.4 is provided in the middle of the second annular groove 4.3. A circular hole 4.2 is provided in the cylindrical groove 4.4, penetrating the third side plate 3.0 and the fourth side plate 4.0. A large toothed disc 3.4 is also provided in the cylindrical groove 4.4. The toothed surface of 4 faces outward from the cylindrical groove 4.4; the control pressure part 7 is connected to an operating rod 7.1, which passes through a circular hole 4.2 and a mounting hole from the outside to the inside. The first annular groove 3.3 and the second annular groove 4.3 are rotatably assembled to form a first space. The cylindrical groove 4.4 and the top surface of the circular column 3.2 are rotatably assembled to form a second space. A torsion spring 8 is provided in the first space, and the two ends of the torsion spring 8 are respectively connected to the first annular groove 3.3 and the second annular groove 4.3. The operating rod 7.1 in the second space and the receiving groove is... Two identical lower gear discs, 7.2 and 7.3, are respectively fitted onto the lower gear discs. The lower gear disc 7.2 is adapted to the large gear disc 3.4 to achieve contact and engagement. A compression spring 9 is connected between the lower gear disc 7.3 and the bottom of the receiving groove and is fitted onto the operating rod 7.1. The compression spring 9 pulls the lower gear disc 7.3 so that the lower gear disc 7.2 on the operating rod 7.1 contacts and engages with the large gear disc 3.4 in the cylindrical groove 4.4, and the lower gear disc 7.3 contacts and engages with the large gear disc 3.4 in the receiving groove to fix the included angle between the large and small gear discs 3 and 4.

[0038] The retaining sleeve 2 is the outermost structure of the folding knife. The front end of the retaining sleeve 2 is hinged to the front end of the large handle 4. The retaining sleeve 2 is provided with a limiting block 2.2, and the blade 1 is provided with a sliding groove 1.2. The limiting block 2.2 and the sliding groove 1.2 are used to limit the movement position of the blade 1. The rear end of the large handle 3 is hinged to the front end of the small handle 4, and the rear end of the small handle 4 is hinged to the tail end of the blade 1. The large handle fastener 5 (screw, shaft, etc.) is set at the connection position between the protective sleeve 2 and the large handle 3. The blade fastener 6 (screw, shaft, etc.) is set at the connection position between the blade 1 and the small handle 4. The key point is that the large handle 3 and the small handle 4 are hinged through an operating lever mechanism.

[0039] The principle of this invention: The blade 1, retaining sleeve 2, large handle 3, and small handle 4 constitute the basic structure of the rocker slider mechanism. The large handle 3 is driven by the torsion spring 8 to perform the cutting action (making the included angle between the large handle 3 and the small handle 4 smaller until it is 0). Specifically, pressing the control pressure part 7 causes the control pressure part 7 to displace (that is, the first lower toothed disc 7.2 and the second lower toothed disc 7.3 are displaced), causing the first lower toothed disc 7.2 and the second lower toothed disc 7.3 to disengage from the contact engagement of the large handle toothed disc 3.4. Then, under the action of the torsion spring 8, the large handle 3 and the small handle 4 rotate, realizing the movement of the retaining sleeve 2 towards the tail of the blade. Finally, the blade 1 is exposed. The size of the rotation angle is related to the length of the exposed blade 1. The control pressure part 7 is released at any time, and the second lower toothed disc 7.3 is pulled down by the compression spring 9. The first lower gear 7.2 on the operating lever 7.1 can engage with the large gear 3.4 in the cylindrical groove 4.4, and the second lower gear 7.3 can engage with the large gear 3.4 in the receiving groove to fix the included angle between the large gear 3 and the small gear 4.

[0040] Usage: The engagement of the first lower gear disc 7.2 with the large gear disc 3.4 in the cylindrical groove 4.4, and the engagement of the second lower gear disc 7.3 with the large gear disc 3.4 in the receiving groove, are simultaneous, achieving a locked state for the large gear 3 and the small gear 4. Figure 7-9 As shown, a compression spring 9 is connected between the second lower gear plate 7.3 and the bottom of the receiving groove and is sleeved on the operating rod 7.1. Its two ends are connected to the bottom surface of the receiving groove and the upper surface of the second lower gear plate 7.3, respectively, to squeeze and lock the second lower gear plate 7.3 and the large gear plate 3.4 in the receiving groove. At the same time, the first lower gear plate 7.2 contacts and engages with the large gear plate 3.4 in the cylindrical groove 4.4.

[0041] like Figure 7-9 As shown, the torsion spring 8 is located in space one, with one end connected to the mounting hole 3.31 on the large handle 3 and the other end connected to the mounting through hole 4.31 on the small handle 4. This allows the spring force to drive the large handle 3 and small handle 4 to rotate relative to each other. When a person's fingers simultaneously squeeze the control pressure parts 7 on both sides, the lower gear on the two operating lever mechanisms separates from the large handle gear 3.4, and the torsion spring 8 drives the large handle 3 and small handle 4 to rotate relative to each other. If the control pressure parts 7 on both sides are not continuously pressed, the pressure spring 9 drives the lower gear to re-engage with the large handle gear 3.4, holding the blade 1 in place and preventing it from moving forward, thus improving safety during use and carrying. If the control pressure parts 7 on both sides are continuously pressed, the blade will move to... Figure 6 The cutting position is indicated. If any control pressure unit 7 is released midway, the blade 1, the large handle 3, and the small handle 4 will be locked in place as shown. Figure 3-5 The following are examples of various positions during the cutting process. When retracting the blade, press down on both sides of the control pressure section 7 while pushing the blade 1 forward or pulling the control pressure section 7 backward to complete the retraction action.

[0042] In a preferred embodiment, the large handle 3 includes two symmetrically arranged side plates 1.0 and 2.0, with a lower side plate connecting the side plates 1.0 and 2.0, and the side plates 1.0, 2.0 and the lower side plate forming a groove.

[0043] The small handle 4 includes two symmetrically arranged side plates 3.0 and 4.0. An upper side plate connects the side plates 3.0 and 4.0. The side plates 3.0, 4.0 and the upper side plate form a groove 2. The upper side plate has a recess with several protrusions 4.01. The upper end plate of the retaining sleeve 2 has several slots 4.02. When the small handle 4 is fully embedded in the retaining sleeve 2, the protrusions 4.01 are respectively engaged in different slots 4.02 for fixation.

[0044] The first side plate 1.0 and the second side plate 2.0 are located on the inner side of the side end plate and are hinged to the front end of the side end plate respectively; the first side plate 1.0 and the second side plate 2.0 are located on the inner side of the third side plate 3.0 and the fourth side plate 4.0 respectively and are hinged to the front end of the third side plate 3.0 and the fourth side plate 4.0 respectively; the third side plate 3.0 and the fourth side plate 4.0 are located on both sides of the blade 1 and are hinged to the tail end of the blade 1 respectively.

[0045] In a preferred embodiment, the front end of the retaining sleeve 2 is hinged to the front end of the large handle 3 via a large handle fastener 5, and the rear end of the small handle 4 is hinged to the tail end of the blade 1 via a blade fastener 6. The large handle fastener 5 and the blade fastener 6 can be components such as a pivot or a screw.

[0046] In a preferred embodiment, the edges of the first side plate 1.0 and the second side plate 2.0 are respectively provided with clearance grooves 3.6. A limiting block 2.2 is connected to the inner surface of the side end plate, and a linear sliding groove 1.2 is formed on the outer surface of the blade 1. The limiting block 2.2 is slidably disposed in the sliding groove 1.2. When the blade 3 is able to be embedded in the retaining sleeve 2, the limiting block 2.2 can be embedded in the clearance groove 3.6 for clearance.

[0047] like Figure 10 , 11 As shown, the limiting block 2.2 on the protective sleeve 2 is located at the front end of the protective sleeve 2, and a boss 2.21 is provided on it, which is tenoned into the sliding groove 1.2 of the blade 1. When in the cutting state, the limiting block 2.2 is located in front of the tail hole 1.1 of the blade, as shown. Figure 10 , 11As shown, the length of the large handle 3 is greater than that of the small handle 4. The large handle 3 is provided with an avoidance opening 3.6 to avoid the limiting connecting block 2.2 on the protective sleeve 2 when the knife is in the opening state. The large handle 4 and the small handle 3 adopt a staggered structure in terms of thickness.

[0048] Finally, it should be noted that the present invention is not limited to the above embodiments, and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A double-spring spiral-lock folding knife, characterized in that... The device includes a blade (1) and a retaining sleeve (2). A side end plate is provided on each side of the blade (1), and an upper end plate is connected between the upper ends of the side end plates. The side end plates and the upper end plate form the retaining sleeve (2). The retaining sleeve (2) is slidably disposed outside the blade (1). A large handle (3) and a small handle (4) are provided on one side of the blade edge of the blade (1). The front end of the retaining sleeve (2) is hinged to the front end of the large handle (3), and the rear end of the large handle (3) is hinged to the front end of the small handle (4). The rear end of the small handle (4) is hinged to the tail end of the blade (1). A first groove and a second groove are respectively provided on the large handle (3) and the small handle (4) to accommodate the blade (1). The first groove and the second groove can be connected to form a linear storage groove. The blade (1) can be fully embedded in the storage slot, the large handle (3) and the small handle (4) can be embedded in the retaining sleeve (2), and the large handle (3) can be embedded in the second slot of the small handle (4) to realize the large handle (3) and the small handle (4) as a knife handle; when the retaining sleeve (2) wraps around the front end of the blade (1), the blade (1) is fully embedded in the storage slot and the large handle (3) is embedded in the retaining sleeve (2); when the large handle (3) is embedded in the second slot of the small handle (4) to form a knife handle, the retaining sleeve (2) can cooperate with the knife handle to lock it; the large handle (3) includes two symmetrically arranged first side plates (1.0) and second side plates (2.0), and a lower side plate is connected between the first side plates (1.0) and the second side plates (2.0). The first side plate (1.0), the second side plate (2.0), and the lower side plate form a groove. The small handle (4) includes two symmetrically arranged third side plates (3.0) and fourth side plates (4.0). An upper side plate connects the third side plates (3.0) and fourth side plates (4.0). The third side plates (3.0), fourth side plates (4.0), and the upper side plate form a groove. Several protrusions (4.01) are recessed on the upper side plate. Several slots (4.02) are opened on the upper end plate of the retaining sleeve (2). When the small handle (4) is completely embedded in the retaining sleeve (2), the protrusions (4.01) are respectively inserted into different slots (4.02) for fixation. The first side plate (1.0) and the third side plate (3.0) The two side plates (1.0) and the two side plates (4.0) are hinged by a control pressure rod mechanism. The control pressure rod mechanism includes a circular column (3.2), a large gear plate (3.4), a first annular groove (3.3), a second annular groove (4.3), a cylindrical groove (4.4), and a control pressure part (7). The outer surfaces of the first side plate (1.0) and the second side plate (2.0) are each provided with a first annular groove (3.3). The inner surfaces of the first side plate (1.0) and the second side plate (2.0) are each recessed with a receiving groove, which protrudes from the middle of the first annular groove (3.3) to form a circular column (3.2). The circular column (3.2) is provided with a mounting hole, and a circular large gear plate (3.0) is placed in the receiving groove.4), and the tooth surface of the large toothed disc (3.4) is arranged facing outward from the receiving groove; the inner surfaces of the third side plate (3.0) and the fourth side plate (4.0) are provided with a second annular groove (4.3), and a cylindrical groove (4.4) is provided in the middle of the second annular groove (4.3), and a round hole (4.2) is provided in the cylindrical groove (4.4) through the third side plate (3.0) and the fourth side plate (4.0). 4) A large gear disc (3.4) is also provided inside, and the tooth surface of the large gear disc (3.4) in the cylindrical groove (4.4) faces outward from the cylindrical groove (4.4); the control pressure part (7) is connected to an operating rod (7.1), and the operating rod (7.1) passes through a circular hole (4.2) and a mounting hole in sequence from the outside to the inside. The first annular groove (3.3) and the second annular groove (4.3) can be rotatably spliced ​​together to form a first space. The cylindrical The top surface of the shaped groove (4.4) and the circular column (3.2) are rotatably joined together to form a second space. A torsion spring (8) is provided in the first space, and the two ends of the torsion spring (8) are respectively connected to the first annular groove (3.3) and the second annular groove (4.3). The operating rod (7.1) in the second space and the receiving groove is respectively fitted with a first lower gear plate (7.2) and a second lower gear plate (7.3) of the same size. The second lower gear plate (7.3) 3) A compression spring (9) is connected to the bottom of the receiving groove and sleeved on the operating rod (7.1). The compression spring (9) pulls the second lower gear disc (7.3) so that the first lower gear disc (7.2) on the operating rod (7.1) contacts and engages with the large gear disc (3.4) in the cylindrical groove (4.4), and the second lower gear disc (7.3) contacts and engages with the large gear disc (3.4) in the receiving groove to fix the included angle between the large handle (3) and the small handle (4).

2. A double-spring spiral-lock folding knife according to claim 1, characterized in that... A limiting block is connected to the inner side of the side end plate, and a linear groove (1.2) is opened on the outer side of the blade (1). The limiting block is slidably disposed in the groove (1.2).

3. A double-spring spiral-lock folding knife according to claim 1, characterized in that... The first side plate (1.0) and the second side plate (2.0) are located on the inner side of the side end plate and are hinged to the front end of the side end plate respectively; the first side plate (1.0) and the second side plate (2.0) are located on the inner side of the third side plate (3.0) and the fourth side plate (4.0) respectively and are hinged to the front end of the third side plate (3.0) and the fourth side plate (4.0) respectively; the third side plate (3.0) and the fourth side plate (4.0) are located on both sides of the blade (1) and are hinged to the tail end of the blade (1) respectively.

4. A double-spring spiral-lock folding knife according to claim 1, 2, or 3, characterized in that... The front end of the retaining sleeve (2) is hinged to the front end of the large handle (3) by the large handle fastener (5), and the rear end of the small handle (4) is hinged to the tail end of the blade (1) by the blade fastener (6).

5. A double-spring spiral-lock folding knife according to claim 2, characterized in that... The edges of the first side plate (1.0) and the second side plate (2.0) are respectively provided with clearance grooves (3.6). When the large handle (3) is able to be embedded in the retaining sleeve (2), the limiting block can be embedded in the clearance groove (3.6) for clearance.

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