Folding knife

Abstract

The folding knife comprises a left handle piece, a right handle piece, a blade and a locking mechanism, the locking mechanism comprises a locking assembly and an elastic piece, the locking assembly is sequentially and integrally formed by a button, a sliding rod, a connecting rod and a locking block from left to right, a sliding groove is formed in the inner side of the right handle piece, a second sliding hole is formed in the left outer handle piece, and the elastic piece is arranged in the sliding groove. When the sliding rod is in sliding fit with the interior of the first sliding hole, the locking block is in sliding fit with the interior of the sliding groove, the button is in sliding fit with the interior of the second sliding hole, a first clamping opening is formed in the tail end of the blade, and when the blade rotates to be in an open state, the elastic piece can push the locking block to be buckled with the first clamping opening without external force. And when the button is pressed, the locking block is pushed to be separated from the first bayonet. According to the folding knife, locking of the blade in the open state can be relieved by pressing the button, and compared with an existing unlocking mode that an elastic piece is poked through fingernails, the unlocking mode is more convenient to operate and saves labor, and the fingernails cannot be damaged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to cutting tool technical field, concretely relates to a folding knife. BACKGROUND

[0002] The folding knife is a kind of manual cutting tool for cutting articles. The blade of the folding knife can be opened and folded, when needing to use, the blade can be opened to cut articles, and when not needing to use, the blade can be folded to carry and store more conveniently.

[0003] As Chinese utility model patent authorized announcement No. CN208867222U discloses a kind of folding knives, including the left handle piece and right handle piece of opposite arrangement, the blade of hinging in two handle pieces, and the spring piece of being located on right handle piece, blade can be opened and folded relative to two handle pieces, the tail end of the blade is provided with notch, when blade is rotated to open state, spring piece will be deformed to the inside direction without external force and cooperate with the notch of blade, at this time, spring piece will be stopped in the notch of blade, so that blade cannot be folded, to lock blade in open state, guarantee the structural stability of blade in open state, so that cutting article is more convenient. And spring piece is deformed to outside and separates the notch of blade, locking can be released, so that blade can be folded.

[0004] But the above-mentioned folding knife also has the deficiency, that is, by the notch of spring piece and blade cooperation to lock blade in open state, when needing to release locking, user needs to use the nail of thumb to drive spring piece to separate notch, to release locking. Because the spring force of spring piece is big, it is more laborious to drive spring piece using the nail of thumb, and unlocking operation is not convenient, and when driving spring piece, even it is easy to cause damage to nail. UTILITY MODEL CONTENTS

[0005] In view of the above deficiencies in the prior art, the utility model aims to provide a folding knife with convenient unlocking operation.

[0006] In order to achieve the above object, the utility model adopts the technical scheme: a folding knife, including opposite left handle piece and right handle piece, and blade hinged between the two handle pieces, the blade can be opened and folded relative to the two handle pieces, the folding knife further includes a locking mechanism for locking the blade in the open state, the locking mechanism includes a locking assembly and an elastic member, the locking assembly is integrally formed from left to right by a button, a slide rod, a connecting rod and a lock block, and the diameter of the button is greater than that of the slide rod, and the diameter of the slide rod is greater than that of the connecting rod; the left handle piece includes a left inner handle piece and a left outer handle piece which are stacked with each other, the blade is arranged between the left inner handle piece and the right handle piece, the left inner handle piece is provided with an avoiding hole through which the button passes and a first sliding hole which can be slidably matched with the slide rod, the avoiding hole and the first sliding hole are communicated through a guide groove, the width of the guide groove is greater than or equal to the diameter of the connecting rod and less than the diameter of the slide rod; the right handle piece is provided with a sliding groove on the inner side, and the left outer handle piece is provided with a second sliding hole, when the slide rod is slidably matched in the first sliding hole, the lock block is slidably matched in the sliding groove at this time, and the button is slidably matched in the second sliding hole, the tail end of the blade is provided with a first clamping hole matched with the lock block, when the blade is rotated to the open state, the elastic member will push the lock block out of the sliding groove and be buckled with the first clamping hole under the action of no external force, and pressing the button will push the lock block away from the first clamping hole.

[0007] In the above scheme, when the blade is rotated to the open state, the elastic member will push the lock block out of the sliding groove and be buckled with the first clamping hole under the action of no external force at this time, the first clamping hole of the blade is buckled with the lock block, so that the blade cannot be rotated and folded, thereby locking the blade in the open state, ensuring the structural stability of the blade in the open state, and cutting is more convenient and safe. When the blade needs to be rotated and folded, the button can be pressed to push the lock block into the sliding groove and away from the first clamping hole, so that the locking of the blade in the open state is released, and the blade can be rotated and folded at this time. Compared with the existing unlocking mode of pushing the elastic piece with the fingernail, the unlocking mode of pressing the button in this scheme is more convenient and labor-saving, and the fingernail will not be damaged. In addition, by providing the avoiding groove, the second sliding hole and the guide groove in the left inner handle piece, when the locking assembly needs to be installed, the button and the slide rod can be passed through the avoiding hole and located at the left side of the left inner handle piece, then the connecting rod is passed through the guide groove and arranged in the first sliding hole, and the locking assembly is moved to the right to make the slide rod slidably matched with the first sliding hole, so that the assembly operation of the slide rod and the first sliding hole of the left inner handle piece can be completed, and the disassembly and assembly are more convenient.

[0008] Further, the outer side of the button is provided with a flange, the button is slidably matched with the second sliding hole through the flange, the left end of the inner side of the second sliding hole is provided with a limiting protrusion, the left side of the flange is abutted with the right side of the limiting protrusion, and the limiting protrusion can block the flange from sliding out of the second sliding hole, thereby ensuring the installation stability of the button.

[0009] Further, the lock block is integrally formed by the left segment, the middle segment and the right segment in sequence, the left segment and the right segment are cylindrical structures, and the middle segment is a circular truncated cone structure, wherein the diameter of the right side surface of the middle segment is greater than the diameter of the left side surface of the middle segment, the diameter of the right side surface of the middle segment is equal to the diameter of the right segment, the diameter of the left side surface of the middle segment is equal to the diameter of the left segment, the diameter of the first clamping hole is greater than the diameter of the left side surface of the middle segment and less than the diameter of the right side surface of the middle segment, and when the blade is rotated to the open state, the elastic member pushes the middle segment of the lock block out of the sliding groove and engages with the first clamping hole without external force. According to the scheme, the lock block is divided into the left segment, the middle segment and the right segment, and the middle segment is a circular truncated cone structure (the side wall of the circular truncated cone body is an inclined structure), so that the side wall of the first clamping hole can slide along the side wall of the middle segment, which facilitates the engagement and disengagement of the middle segment of the lock block with the first clamping hole, and the locking is more convenient. The diameter of the first clamping hole is set to be less than the diameter of the right side surface of the middle segment, so that the middle segment of the lock block cannot slide too much to the left and pass the first clamping hole, thereby ensuring the stability of the installation of the lock block. In addition, when the blade is locked in the open state, the middle segment of the lock block engages with the first clamping hole, and when the user is cutting an object, the blade will inevitably rotate naturally, so that the middle segment of the circular truncated cone structure is forced to move to the right to the position where the first clamping hole engages with the left segment. Since the left segment is a cylindrical structure (the side wall of the cylinder is a flat structure), the left segment of the cylinder will not be forced to move by the side wall of the first clamping hole, so that the left segment can stably engage with the first clamping hole, thereby preventing the lock block from automatically disengaging from the first clamping hole and ensuring the locking stability of the blade in the open state.

[0010] Further, the elastic member is a spring, the right end surface of the lock block is provided with a spring groove, and the spring is arranged in the spring groove. The spring groove can improve the installation stability of the spring, and the two ends of the spring are respectively abutted against the groove bottom of the spring groove and the groove bottom of the sliding groove. Without external force, the spring pushes the lock block to slide to the left by the elastic force of the spring.

[0011] Further, the tail end of the blade is further provided with a second clamping hole matched with the lock block. When the blade is rotated to the folded state, the elastic member pushes the lock block to slide out of the sliding groove and engage with the second clamping hole without external force. At this time, the second clamping hole of the blade engages with the lock block, so that the blade cannot be rotated and opened, thereby locking the blade in the folded state, avoiding the automatic rotation and opening of the blade in the folded state, and ensuring the safety of carrying. When the blade needs to be rotated and opened, the button can be pressed to push the lock block to slide into the sliding groove and disengage from the second clamping hole, thereby releasing the locking of the blade in the folded state. At this time, the blade can be rotated and opened.

[0012] Further, the right handle piece is provided with a guide slot, and the right side of the rear end of the blade is provided with a guide column, the guide column is inserted into the guide slot, and the rotation of the blade drives the guide column to slide along the guide slot, so that the rotation stability of the blade can be improved.

[0013] Further, the left inner handle piece and the right handle piece are provided with a partition block at the rear end position, the partition block can separate the left inner handle piece and the right handle piece by a distance, the installation of the blade is facilitated, and the installation of the two handle pieces is more stable.

[0014] Further, the blade is hinged with the left handle piece and the right handle piece through a pin component, the pin component comprises a female pin and a male pin, the female pin is sequentially inserted through the left outer handle piece, the left inner handle piece, the blade and the right handle piece and connected with the male pin, so that the blade can be rotated to open and fold around the female pin, and the folding knife can be conveniently disassembled and assembled.

[0015] Further, the left side and the right side of the blade are respectively provided with a convex column, when the blade is rotated to the folding state, the convex column is located outside the left handle piece and the right handle piece, so that the convex column can be pulled to drive the blade to rotate to open, and the opening operation of the blade is more convenient.

[0016] Further, the right handle piece is provided with a belt clamp, so that the folding knife can be buckled on the belt and the like for carrying, and the carrying is more convenient.

[0017] The blade of the folding knife can be locked in the open state and the folding state, the structural stability of the blade in the open state and the folding state is ensured, the folding knife is convenient and safe to use. When unlocking is needed, the button is pressed to drive the locking block to be separated from the first clamping hole and the second clamping hole, so that the locking of the blade is released. Compared with the unlocking mode of the existing folding knife that the elastic piece is pulled by a finger nail, the unlocking mode is more convenient and labor-saving to operate, and the finger nail is not damaged. In addition, the locking assembly is of an integrated structure, when the folding knife is installed, the button and the sliding rod are inserted through the avoiding slot, and the connecting rod is placed in the first sliding hole through the guide slot, so that the sliding rod and the first sliding hole are in sliding connection. Compared with the traditional button and the sliding rod in threaded connection, the disassembly and assembly of the locking assembly are more convenient, and the disassembly and assembly time of the folding knife is saved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the exploded structural schematic view of the folding knife of the utility model embodiment.

[0019] Figure 2 It is the structure schematic view of the locking assembly of the utility model embodiment.

[0020] Figure 3 It is the exploded structural schematic view of the left handle piece of the utility model embodiment.

[0021] Figure 4 It is the structure schematic view of the folding knife in the open state of the utility model embodiment.

[0022] Figure 5 It is the structure schematic view of the folding knife in the open state of the utility model embodiment (omitting the left handle piece structure in the drawing).

[0023] Figure 6 It is the structure schematic view of the folding knife in the open state of the utility model embodiment. Figure 4 It is the A-A section view of the utility model embodiment.

[0024] Figure 7 It is the structure schematic view of the left section of the locking block and the first clamping opening of the utility model embodiment.

[0025] Figure 8 It is the structure schematic view of the folding knife in the folding state of the utility model embodiment.

[0026] Figure 9 It is the structure schematic view of the folding knife in the folding state of the utility model embodiment (omitting the left handle piece structure in the drawing). DETAILED DESCRIPTION

[0027] The drawings are only used for example description, and cannot be understood as the limitation of the patent; in order to better describe the embodiment, some components of the drawings can be omitted, enlarged or reduced, and do not represent the size of the actual product; for the person skilled in the art, it is understandable that some known structures and their description in the drawings can be omitted. The position relationship described in the drawings is only used for example description, and cannot be understood as the limitation of the patent.

[0028] The same or similar signs in the drawings of the utility model embodiment correspond to the same or similar components; in the description of the utility model, it is understood that if the terms "upper", "lower", "left", "right", "long", "short" and the like indicate the orientation or position relationship, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, a specific orientation and operation, therefore, the terms describing the position relationship in the drawings are only used for example description, and cannot be understood as the limitation of the patent, and for the person skilled in the art, the specific meaning of the above terms can be understood according to the specific situation.

[0029] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0030] Example 1

[0031] like Figure 1 As shown, this embodiment provides a folding knife, including a left handle 1 and a right handle 2 disposed opposite to each other, and a blade 3 hinged between the two handles. The blade 3 can rotate relative to the two handles to open and fold. The folding knife also includes a locking mechanism for locking the blade 3 in the open state. The locking mechanism includes a locking component and an elastic element 45, such as... Figure 2 As shown, the locking assembly is integrally formed from left to right by a button 41, a slide bar 42, a connecting rod 43, and a locking block 44. The axes of the button 41, slide bar 42, connecting rod 43, and locking block 44 are equal, and the diameter of the button 41 is larger than the diameter of the slide bar 42, and the diameter of the slide bar 42 is larger than the diameter of the connecting rod 43.

[0032] like Figure 1 , 3 As shown, the aforementioned left handle 1 includes a left inner handle 11 and a left outer handle 12 stacked on top of each other. The blade 3 is placed between the left inner handle 11 and the right handle 2. The left inner handle 11 has a clearance hole 111 through which the button 41 can pass and a first sliding hole 112 that can slide with the slide rod 42. The clearance hole 111 and the first sliding hole 112 are connected by a guide groove 113. The width of the guide groove 113 is greater than or equal to the diameter of the connecting rod 43, but less than the diameter of the slide rod 42. The aforementioned right handle 2 has a sliding groove 21 on its inner side, and the left outer handle 12 has a second sliding hole 121. When the slide rod 42 slides in the first sliding hole 121, the locking block 44 slides in the sliding groove 21, and the button 41 slides in the second sliding hole 121. The blade 3 has a first latch 31 at its tail end that engages with the locking block 44. When the blade 3 is rotated to the open state, the elastic element 45 will push the locking block 44 out of the slide groove 21 and engage with the first latch 31 without any external force. Pressing the button 41 will push the locking block 44 to disengage from the first latch 31.

[0033] When using the folding knife in this embodiment, as follows: Figure 4 , 6As shown, when the blade 3 is rotated to the open state, the elastic member 45 will push the lock block 44 out of the sliding groove 21 to the left under the action of its own elastic force without external force, so that the left end of the lock block 44 is buckled with the first clamping hole 31 of the blade 3. At this time, the first clamping hole 31 of the blade 3 is blocked by the lock block 44, so that the blade 3 cannot be rotated and folded, thereby locking the blade 3 in the open state, ensuring the structural stability of the blade 3 in the open state, so that the cutting object is more convenient and safe. When the blade 3 needs to be rotated and folded, the button 44 can be pressed to push the lock block 44 into the sliding groove 21 to the right and away from the first clamping hole 31, thereby releasing the locking of the blade 3 in the open state. At this time, the blade can be rotated and folded.

[0034] In addition, when the locking assembly needs to be installed, as shown in Figure 1 , the left inner handle piece 11 and the left outer handle piece 12 can be separated first, then the button 41 and the sliding rod 42 can be located on the left side of the left inner handle piece 11 through the avoidance hole 111, then the connecting rod 43 can be placed in the first sliding hole 112 through the guide groove 113, then the locking assembly can be moved to the right so that the sliding rod 42 is slidably fitted in the first sliding hole 112, and finally the left outer handle piece 12 can be overlapped with the left inner handle piece 11, so that the button 41 is slidably fitted in the second sliding hole 121, and the lock block 44 is slidably fitted in the sliding groove 21 of the right handle piece 2. The assembly operation of the locking assembly can be completed, and the disassembly is more convenient.

[0035] As an improved scheme of the embodiment, as shown in Figure 2 , 6 , a flange 411 is arranged on the outer circumference of the button 41, the button 41 is slidably fitted in the second sliding hole 121 through the flange 411, a limiting protrusion 1211 is arranged at the left inner side of the second sliding hole 121, the left side of the flange 411 abuts against the right side of the limiting protrusion 1211, and the limiting protrusion 1211 can block the flange 411 from sliding out of the second sliding hole 121, thereby ensuring the installation stability of the button 41.

[0036] In addition, the elastic member 45 is a spring, a spring groove 410 is arranged on the right end face of the lock block 44, the spring is arranged in the spring groove 410, and the spring groove 410 can improve the installation stability of the spring. The left end of the spring abuts against the groove bottom of the spring groove 410, and the right end of the spring abuts against the groove bottom of the sliding groove 21. Under the action of the elastic force of the spring without external force, the spring will push the lock block 44 to slide to the left.

[0037] When the blade 3 of the folding knife of the embodiment is locked in the open state, the button 41 only needs to be pressed to unlock. Compared with the existing unlocking mode of pushing the elastic piece with a fingernail, the unlocking mode of the folding knife of the embodiment is more convenient and labor-saving, and the fingernail will not be damaged.

[0038] Embodiment two

[0039] This embodiment is a further improvement on the folding knife structure of embodiment one, which is improved in that, as shown in Figure 2 、 6 The lock block 44 is integrally formed by the left segment 441, the middle segment 442 and the right segment 443 in sequence, the left segment 441 and the right segment 443 are cylindrical structures, and the middle segment 442 is a circular truncated cone structure, wherein the right side diameter of the middle segment 442 is greater than the left side diameter, the right side diameter of the middle segment 442 is equal to the diameter of the right segment 443, the left side diameter of the middle segment 442 is equal to the diameter of the left segment 441, and the diameter of the first notch 31 is greater than the left side diameter of the middle segment 442 and less than the right side diameter of the middle segment 442. When the blade 3 is turned to the open state, the spring will push the middle segment 442 of the lock block 44 out of the sliding groove 21 and be buckled with the first notch 31 without external force.

[0040] When the folding knife of this embodiment is used, when the blade 3 is locked in the open state, as shown in Figure 6 At this time, the middle segment 442 of the lock block 44 is buckled with the first notch 31. Since the middle segment 442 is a circular truncated cone structure (the side wall of the circular truncated cone body is an inclined structure), the side wall of the first notch 31 can slide along the side wall of the middle segment 442, so that the middle segment 442 of the lock block 44 and the first notch 31 can be buckled and separated conveniently, and the locking is more convenient. The diameter of the first notch 31 is set to be less than the right side diameter of the middle segment 442, so that the middle segment 442 of the lock block 44 cannot slide too much to the left and pass the first notch 31, ensuring the installation stability of the lock block 44.

[0041] As shown in Figure 7 When the user cuts the object, the blade 3 will inevitably rotate naturally, so that the middle segment 442 of the circular truncated cone structure will be forced to move to the right by the side wall of the first notch 31 to the position where the first notch 31 is buckled with the left segment 441. Since the left segment 441 is a cylindrical structure (the side wall of the cylindrical body is a flat structure), the left segment 441 of the cylindrical body will not be forced to displace by the side wall of the first notch 31, so that the left segment 441 can be stably buckled with the first notch 31, which can prevent the lock block 44 from automatically separating from the first notch 31, and ensure the locking stability of the blade 3 in the open state.

[0042] As an improved scheme of this embodiment, as shown in Figure 8 、 9As shown, the tail end of the blade 3 is further provided with a second clamping hole 32 matched with the lock block 44, the diameter of the second clamping hole 32 is greater than that of the left segment 441 and less than that of the right segment 443, when the blade 3 is rotated to the folded state, the spring will push the lock block 44 to slide to the left without external force, so that the middle segment 442 of the lock block 44 slides out of the sliding groove 21 and is buckled with the second clamping hole 32, at this time, the second clamping hole 32 of the blade 3 is buckled with the lock block 44, so that the blade 3 cannot be rotated to open, thereby locking the blade 3 in the folded state, avoiding the automatic rotation of the blade 3 in the folded state, and carrying is safer. When the blade 3 needs to be rotated to open, the button 41 can be pressed to push the left segment 441 of the lock block 44 to slide into the sliding groove 21 and be separated from the second clamping hole 32, thereby releasing the locking of the blade 3 in the folded state, at this time, the blade 3 can be rotated to open.

[0043] Embodiment three

[0044] This embodiment is a further improvement on the basis of the folding knife structure of embodiment two, and the improvement is that, as shown in Figure 1 As shown, the left inner handle piece 11 and the right handle piece 2 are respectively provided with guide grooves 20, and the rear end of the blade 3 is respectively provided with guide columns 33, the two guide columns 33 are respectively inserted into the corresponding side of the guide groove 20, rotating the blade 3 will drive the guide column 33 to slide along the guide groove 20, which can improve the rotation stability of the blade 3. When the blade 3 is rotated to the open state, the guide column 33 abuts against the front end of the guide groove 20, at this time, the guide column 33 cannot slide forward along the guide groove 20, thereby limiting the blade 3 from over-rotating to the open direction. When the blade 3 is rotated to the closed state, the guide column 33 abuts against the rear end of the guide groove 20, at this time, the guide column 33 cannot slide backward along the guide groove 20, thereby limiting the blade 3 from over-rotating to the folded direction. In addition, under the cooperation of the guide column 33 and the guide groove 20, the blade 3 can also be positioned, so that the left segment 441 of the lock block 44 can be more accurately buckled with the first clamping hole 31 and the second clamping hole 32.

[0045] As an improved scheme of this embodiment, again as shown in Figure 1 As shown, the tail end position between the left inner handle piece 11 and the right handle piece 2 is provided with a partition block 5, which can separate the left inner handle piece 11 and the right handle piece 2 by a distance, so as to facilitate the installation of the blade 3, and the installation of the two handle pieces is more stable.

[0046] The blade 3 is hinged with the two handle pieces through a pin assembly, the pin assembly includes a female pin 61 and a male pin 62, the female pin 61 passes through the left outer handle piece 12, the left inner handle piece 11, the blade 3 and the right handle piece 2 in sequence and is connected with the male pin 62, so that the blade 3 can be rotated to open and fold around the female pin 61, ensuring the rotation stability of the blade 3, and facilitating the disassembly and assembly of the folding knife.

[0047] In addition, the right handle piece 2 is provided with a belt clamp 7, so that the folding knife can be buckled on a belt or other articles for carrying, and the carrying is more convenient. Figure 8 As shown in the figure, the left and right sides of the blade 3 are respectively provided with a convex column 34, when the blade 3 is rotated to the folding state, the convex column 34 is located outside the left handle piece 1 and the right handle piece 2, so that the blade 3 can be rotated and opened by pulling the convex column 34, and the opening operation of the blade 3 is more convenient.

[0048] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not the limitation of the embodiments of the utility model. For the ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments are not enumerated. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A folding knife comprising a left handle (1) and a right handle (2) arranged opposite to each other, and a blade (3) hinged between the two handles, the blade (3) being able to rotate open and fold relative to the two handles, characterized in that: The locking mechanism comprises a locking assembly and an elastic member (45), the locking assembly is integrally formed from left to right by a button (41), a slide rod (42), a connecting rod (43) and a locking block (44), and the diameter of the button (41) is greater than that of the slide rod (42), and the diameter of the slide rod (42) is greater than that of the connecting rod (43); The left handle piece (1) comprises a left inner handle piece (11) and a left outer handle piece (12) which are stacked with each other, the blade (3) is arranged between the left inner handle piece (11) and the right handle piece (2), the left inner handle piece (11) is provided with an avoiding hole (111) through which the button (41) passes and a first sliding hole (112) which is in sliding cooperation with the slide rod (42), the avoiding hole (111) and the first sliding hole (112) are communicated through a guide groove (113), and the width of the guide groove (113) is greater than or equal to the diameter of the connecting rod (43) and less than the diameter of the slide rod (42); The right handle piece (2) is provided with a sliding groove (21) on the inner side, and the left outer handle piece (12) is provided with a second sliding hole (121), when the slide rod (42) is in sliding cooperation in the first sliding hole (112), at this time, the locking block (44) is in sliding cooperation in the sliding groove (21), and the button (41) is in sliding cooperation in the second sliding hole (121), the tail end of the blade (3) is provided with a first clamping hole (31) which is in cooperation with the locking block (44), when the blade (3) is rotated to the open state, the elastic member (45) pushes the locking block (44) out of the sliding groove (21) and is buckled with the first clamping hole (31) under the action of no external force, and pressing the button (41) pushes the locking block (44) away from the first clamping hole (31).

2. The folding knife of claim 1 wherein: The outer side of the button (41) is provided with a flange (411), the button (41) is in sliding cooperation in the second sliding hole (121) through the flange (411), the left end of the inner side of the second sliding hole (121) is provided with a limiting protrusion (1211), and the left side of the flange (411) is in abutment with the right side of the limiting protrusion (1211).

3. The folding knife of claim 1 wherein: The locking block (44) is integrally formed from left to right by a left segment (441), a middle segment (442) and a right segment (443), the left segment (441) and the right segment (443) are cylindrical structures, and the middle segment (442) is a circular truncated cone structure, wherein the diameter of the right side surface of the middle segment (442) is greater than that of the left side surface, the diameter of the right side surface of the middle segment (442) is equal to that of the right segment (443), the diameter of the left side surface of the middle segment (442) is equal to that of the left segment (441), the diameter of the first clamping hole (31) is greater than that of the left side surface of the middle segment (442) and less than that of the right side surface of the middle segment (442), and when the blade (3) is rotated to the open state, the middle segment (442) of the locking block (44) is pushed out of the sliding groove (21) and buckled with the first clamping hole (31) under the action of no external force.

4. The folding knife of claim 1 wherein: The elastic member (45) is a spring, the right end surface of the locking block (44) is provided with a spring groove (440), the spring is arranged in the spring groove (440), and the two ends of the spring are in abutment with the groove bottom of the spring groove (440) and the groove bottom of the sliding groove (21) respectively.

5. The folding knife of any of claims 1-4, wherein: The tail end of the blade (3) is also provided with a second clamping hole (32) matched with the lock block (44), when the blade (3) rotates to the folding state, the elastic member (45) pushes the lock block (44) to slide out of the sliding groove (21) and is buckled with the second clamping hole (32) without external force.

6. The folding knife of claim 5 wherein: The inside of the right handle piece (2) is provided with a guide groove (20), the rear end of the blade (3) is provided with a guide column (33), the guide column (33) is inserted into the guide groove (20), rotating the blade (3) drives the guide column (33) to slide along the guide groove (20), when the blade (3) rotates to the opening state, the guide column (33) abuts against the front end of the guide groove (20), when the blade (3) rotates to the closing state, the guide column (33) abuts against the rear end of the guide groove (20).

7. The folding knife of claim 5 wherein: The rear end position between the left inner handle piece (11) and the right handle piece (2) is provided with a partition block (5).

8. The folding knife of claim 5 wherein: The blade (3) is hinged with the left handle piece (1) and the right handle piece (2) through a sub-mother nail assembly, the sub-mother nail assembly comprises a mother nail (61) and a sub nail (62), the mother nail (61) passes through the left outer handle piece (12), the left inner handle piece (11), the blade (3) and the right handle piece (2) in sequence and is connected with the sub nail (62).

9. The folding knife of claim 5 wherein: The left and right sides of the blade (3) are respectively provided with convex columns (34), when the blade (3) rotates to the folding state, the convex columns (34) are located outside the left handle piece (1) and the right handle piece (2).

10. The folding knife of claim 5 wherein: The outside of the right handle piece (2) is provided with a belt clamp (7).

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