Foldable cutting tools

Abstract

This utility model provides a foldable cutting tool, including: a blade with a first rotating structure; a handle structure with a second rotating structure; a rotating shaft extending along a first direction and connecting the first and second rotating structures, allowing the blade and handle structure to rotate about the first direction as an axis, thereby switching between an unfolded use state and a folded storage state; and a rotating locking structure disposed in a first accommodating space in the handle structure and rotating about a second direction as an axis. When rotated to the first position, the rotating locking structure contacts a first part of the blade to fix the blade in the unfolded use state; when rotated to the second position, the rotating locking structure provides a notch to allow a second part of the blade to rotate through, switching to the folded storage state. The second direction is different from the first direction. The foldable cutting tool provided by this utility model has highly reliable locking performance and eliminates the need for overly complex mechanism designs.

Description

Technical Field

[0001] This utility model relates to a cutting tool, and more particularly to a foldable cutting tool. Background Technology

[0002] In daily life at home and during outdoor activities, there are often scenarios where it is necessary to open packaging, cut ropes, paper, food, and other everyday items. Knives or saws with cutting functions come in handy and are indispensable cutting tools. Knives or saws with folding storage (hereinafter referred to as foldable cutting tools) are the mainstream products of portable knives because they are convenient to carry and have functions that protect the blade and the user.

[0003] To ensure the stability of the blade or saw in foldable cutting tools during use and prevent the risk of closure due to force or shaking, a locking mechanism is an essential feature of foldable cutting tools. However, achieving both high reliability and a simple mechanism design in the locking mechanism is beyond the capabilities of existing technologies. Therefore, this project aims to develop a technical approach and related structure that enables foldable cutting tools to have highly reliable locking performance while eliminating overly complex mechanism designs. Utility Model Content

[0004] This utility model embodiment provides a foldable cutting tool to improve upon or solve the aforementioned technical problems of the prior art. The tool includes: a blade with a first rotating structure; a handle structure with a second rotating structure; a rotating shaft extending along a first direction and connecting the first and second rotating structures, allowing the blade and handle structure to rotate about the first direction as an axis, thereby switching between an unfolded use state and a folded storage state; and a rotating locking structure disposed in a first accommodating space within the handle structure and rotating about a second direction as an axis. When rotated to a first position, the rotating locking structure contacts a first portion of the blade to fix the blade in the unfolded use state. When rotated to a second position, the rotating locking structure provides a notch to allow a second portion of the blade to rotate through, switching to the folded storage state. The second direction is different from the first direction.

[0005] In some embodiments, a restoring force providing device is further included, disposed in a second receiving space in the handle structure. The restoring force providing device contacts the rotating locking structure and provides a restoring force to the rotating locking structure, causing the rotating locking structure to rotate toward the first position in a preset rotation direction. The rotating locking structure, upon reaching the first position, contacts the first part of the blade and is fixed in the unfolded use state.

[0006] In some embodiments, the handle structure includes a first handle portion and a second handle portion, with a first accommodating space and a second accommodating space provided between the first handle portion and the second handle portion. The restoring force providing device includes an elastic member and a movable member. The third surface of the movable member contacts the fourth surface of the rotating locking structure. The elastic member provides the restoring force to the movable member and the rotating locking structure. The restoring force can cause the movable member to move toward the rotating locking structure, thereby causing the rotating locking structure to rotate toward the first position along the preset rotation direction. This causes the first surface of the rotating locking structure, upon reaching the first position, to contact the first portion of the blade, thereby fixing both in the unfolded use state.

[0007] In some embodiments, a portion of a spiral structure or an inclined structure is provided on the third surface of the movable object, which engages with another portion of a spiral structure or another inclined structure on the fourth surface of the rotary locking structure, so that when the elastic object pushes the movable object toward the rotary locking structure, the rotary locking structure can be rotated. The elastic object is a compression spring.

[0008] In some embodiments, the main body of the rotary locking structure is a cylinder with the notch, and the aspect ratio of the cylinder is less than or equal to 1.

[0009] In some embodiments, the first rotating structure and the second rotating structure are respectively completed by the first circular hole structure and the second circular hole structure on the blade and the handle structure. The rotating shaft extends along the first direction and passes through the first circular hole structure and the second circular hole structure, so that the blade and the handle structure can rotate about the rotating shaft as an axis on a blade rotation plane. The second direction is orthogonal to the first direction. The rotating shaft of the rotating locking structure is parallel to the blade rotation plane or located on the blade rotation plane.

[0010] In some embodiments, when the rotating locking structure is rotated to the first position, the first surface contacts the first portion of the blade and prevents the blade from rotating, while when the rotating locking structure is rotated to the second position, the notch of the rotating locking structure aligns with the second portion of the blade, allowing the second portion of the blade to rotate through to the folded storage state.

[0011] In some embodiments, when the rotating locking structure is rotated to the second position, the notch of the rotating locking structure is aligned with the second part of the blade. The outer edge of the second part of the blade is an arc, and the first distance between the outer edge of the arc of the second part and the axis of the rotating shaft is equal to or less than a preset length. This allows the second part to pass through the aligned notch and enter the folded storage state when the rotating locking structure is in the second position and the blade is rotated inward.

[0012] In some embodiments, the blade in the folded storage state contacts the rotating locking structure with a third portion. The outer edge of the third portion is another arc. The second distance between the outer edge of the arc of the third portion and the axis of the rotating shaft is less than the preset length and less than the first distance. The restoring force provided by the restoring force providing device to the rotating locking structure causes the rotating locking structure to rotate in the preset rotation direction, so that the second surface of the notch contacts the outer edge of the arc of the third portion of the blade and is fixed in the folded storage state.

[0013] In some embodiments, the rotary locking structure is disposed in the tool holder structure and located around the rotary shaft, and is located on the side closer to the tail of the tool holder structure.

[0014] In some embodiments, the rotating locking structure is disposed on the upper half of the handle structure, and is used to contact the back end of the blade when the blade is fixed in the unfolded use state.

[0015] In some embodiments, a restoring force providing device is further included. The restoring force providing device is a torsion spring disposed in the second receiving space in the handle structure. The torsion spring contacts the rotating locking structure and provides a restoring force to the rotating locking structure, causing the rotating locking structure to rotate toward the first position in a preset rotation direction. When the rotating locking structure reaches the first position, it contacts the first part of the blade and is fixed in the unfolded use state.

[0016] The technical solution provided by this utility model has at least the following beneficial effects: The rotating locking structure can be installed in the first accommodating space of the knife handle structure. The knife handle structure's coverage of its periphery and its own structural strength enhance the damage resistance of the rotating locking structure. The rotating locking structure can be rotated in the first accommodating space along a second direction as an axis under external force, causing the first surface of the rotating locking structure to contact the first part of the knife body. In this way, the knife body cannot rotate clockwise, thus fixing the knife body in this unfolded use state. This provides highly reliable locking performance and eliminates the need for overly complex mechanism designs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1A , Figure 1B , Figure 1C and Figure 1D This is a schematic diagram of a preferred embodiment of the foldable cutting tool provided by this utility model.

[0019] Figure 2A , Figure 2B An exploded view of the folding cutting tool provided in this embodiment of the utility model.

[0020] Figure 3A , Figure 3B This is a detailed structural diagram of the rotary locking structure and the restoring force providing device in an embodiment of this utility model.

[0021] Figure 4A , Figure 4B , Figure 4C and Figure 4D This is a detailed structural diagram of the rotating locking structure, the restoring force providing device, and the blade in the embodiments of this utility model. Detailed Implementation

[0022] Some typical embodiments that can realize the features and advantages of this application will be described in detail in the following description. It should be understood that this application can have various variations in different forms, but none of them depart from the scope of the patent application, and the descriptions and drawings therein are for illustrative purposes only and not for limiting this application.

[0023] Please see Figure 1A , Figure 1B , Figure 1CThis is a schematic diagram of a preferred embodiment of the foldable cutting tool of the present invention. The foldable cutting tool in this embodiment is illustrated by taking the appearance of a folding knife as an example. Of course, the blade can also be converted into a saw, which can transform the folding knife into a folding saw. Therefore, the technical means of this invention can be widely applied to various foldable cutting tools, so it will not be described in detail here.

[0024] As for Figure 1A This diagram primarily illustrates the appearance and internal structure of the folding knife 1 in its unfolded state, including four sections: the blade 11, the handle structure 12, the rotating shaft 13, and the rotating locking structure 14. The blade 11 has a first rotating structure 111; the handle structure 12 has a second rotating structure 122. Figure 1A (Not shown, but please refer to the following figures). In this embodiment, the first rotating structure 111 and the second rotating structure 122 are respectively completed by forming two circular holes or through holes on the blade 11 and the handle structure 12, and the rotating shaft 13 is along the first direction (in Figure 1A The direction perpendicular to the drawing extends through the first rotating structure 111 and the second rotating structure 122 (such as the first circular hole structure and the second circular hole structure in this example), thus combining the first rotating structure 111 and the second rotating structure 122, and allowing the blade 11 and the handle structure 12 to be aligned along the rotating shaft 13 on the first plane (in the direction perpendicular to the drawing). Figure 1A The center (representing the plane) is rotated on, and then in the unfolded usage state ( Figure 1A ) and folded storage state ( Figure 1D Switch between them.

[0025] In this example, the main body of the rotary locking structure 14 is made of a cylinder with a notch 149. The preferred shape of this cylinder is that its aspect ratio (the ratio of the cylinder's height to its base diameter) is less than or equal to 1, meaning it has a relatively uniform or flat shape. This provides better structural strength. The cylinder can also be made of solid or porous materials, thereby enhancing its resistance to deformation. The rotary locking structure 14 can be disposed in the first receiving space of the tool holder structure 12. Figure 1A Not shown, see subsequent diagrams, for example Figure 2A and Figure 2B This further strengthens the protection of the rotating locking structure 14 against damage through the covering of its periphery by the handle structure 12 and its own structural strength. The rotating locking structure 14 can also rotate within the first accommodating space along the second direction 22 as an axis under external force. This external force can be provided by the user (who can flick the surface of the rotating locking structure 14 exposed by an opening on the handle structure 12 with their fingers) or by other external force sources (such as a built-in electric motor providing driving force). Rotating to... Figure 1AThe first surface 141 of the rotating locking structure 14 at the first position shown contacts the first portion 110 of the blade 11. Figure 1A (It is an outwardly protruding end), so that the blade 11 cannot rotate clockwise, thereby fixing the blade 11 in the unfolded use state.

[0026] As for Figure 1B When a user wants to switch from the unfolded state to the folded storage state, they can use external force to rotate the rotating locking structure 14 about the second direction 22 as the axis. Figure 1B After reaching the second position shown, the notch 149 provided by the rotating locking structure 14 aligns with the blade 11. This allows the second portion 112 of the blade 11 to be aligned. Figure 1B For example, a sector with an outer arc) rotates through the gap 149 (e.g. Figure 1C (The diagram shows an intermediate state during the switching process between the two). When the blade 11 is rotated to the final position, it can switch to the state shown. Figure 1D The image shows the folded storage state, where the second direction 22 is different from the first direction. In this example, the second direction is orthogonal to the first direction, but besides orthogonality, the angle between the second direction and the first direction can also be an obtuse angle close to 90 degrees, meaning the second direction is different from the first direction. Alternatively, the rotation axis of the rotating locking structure 14 can be designed not to be perpendicular to the blade's rotation plane. Furthermore, the rotation axis of the rotating locking structure 14 can be restricted to be parallel to the blade's rotation plane, or even, as shown in the figure, the position of the rotation axis of the rotating locking structure 14 can be designed to be located on the blade's rotation plane.

[0027] As for the rotary locking structure 14 disposed in the handle structure 12, its preferred position is disposed in the handle structure 12 and located around the rotary shaft 13 (first rotary structure 111 and second rotary structure 122), but closer to the tail of the handle structure 12. In addition to the preferred position described above, a more preferred position is to dispose of the rotary locking structure 14 around the rotary shaft 13 (first rotary structure 111 and second rotary structure 122); closer to the tail of the handle structure 12; and located in the upper half of the handle structure 12, so that when the blade 11 is fixed in the unfolded use state, the rotary locking structure 14 can contact the tail of the blade back of the blade 11. In this way, the locking performance of the blade 11 and the rotary locking structure 14 in the unfolded use state can be enhanced by utilizing the shape of the tail of the blade back and the cooperation of the rotary locking structure 14.

[0028] Figure 2AThis diagram shows an exploded view of the folding knife 1. The diagram clearly shows the first rotating structure 111 on the blade 11, the second rotating structure 122 on the handle structure 12, and the first direction 21 extending from the rotating shaft 13. The rotating shaft 13, passing through the first rotating structure 111 and the second rotating structure 122 (as shown in the diagram with circular holes), allows the blade 11 and the handle structure 12 to rotate along the rotating shaft 13 on a blade rotation plane. The first accommodating space 121 is provided between the first handle portion 1201 and the second handle portion 1202 included in the handle structure 12. The rotating locking structure 14 is disposed in the first accommodating space 121 (clamped between the first handle portion 1201 and the second handle portion 1202) and rotates along the second direction 22.

[0029] In order to provide a highly reliable locking mechanism, Figure 2A The embodiments also propose a restoring force providing device 15 as shown in the figure. The restoring force providing device 15 in this embodiment consists of a movable object 151 and an elastic object (…). Figure 2A It is composed of a compression spring 152, which can travel along a third direction (this third direction can be parallel to the first plane, while...) Figure 2A In the middle, the third direction and the second direction 22 are the same direction, while the first plane is the same plane as the plane where the blade 11 and the handle structure 12 are located, extending into the second accommodating space 123 in the handle structure 12. As for Figure 2B This reveals the details of part of the first accommodating space 121 and part of the second accommodating space 123 on the second handle portion 1202, where the movable object 151 can translate without rotating in the second accommodating space 123.

[0030] For a clearer understanding of the details regarding the rotary locking structure 14 and the restoring force providing device 15, please refer to [link to relevant documentation]. Figure 3A and Figure 3B The diagram shown is an exploded view of the components of an embodiment of the rotating locking structure 14 and the restoring force providing device 15. It primarily illustrates that the moving object 151 contacts the fourth surface 144 of the rotating locking structure 14 with its third surface 153. The third surface 153 can be part of a helical structure or a sloped structure, and the fourth surface 144 of the rotating locking structure 14 can also be part of a helical structure or another sloped structure. When they contact, they engage, allowing the rotating locking structure 14 to rotate when the elastic object 152 translates and pushes the moving object 151 towards it.

[0031] To more clearly illustrate the relative relationship between the rotating locking structure 14 and the blade 11 at different rotation angles, please refer to... Figure 4A, Figure 4B and Figure 4C The contents shown. Among them, the elastic object in the restoring force providing device 15 ( Figure 4A A compression spring 152 continuously provides a pushing force to the moving object 151, pushing it towards the rotating locking structure 14. Through the inclined surface cooperation between the third surface 153 and the fourth surface 144, a rotational restoring force is provided to the rotating locking structure 14, thereby causing the rotating locking structure 14 to rotate in a preset rotation direction (in this example, the rotating locking structure 14 rotates clockwise to the right) towards the first position. When the rotating locking structure 14 reaches the first position, the first surface 141 of the rotating locking structure 14 contacts the first part 110 of the blade 11, and then... Figure 4A In the unfolded usage state shown, both are fixed, that is, they enter a locked state. Specifically, the rotating locking structure 14 in the first position is pushed by the restoring force provided by the elastic object 152, and thus its first surface 141 contacts and abuts against the first part 110 of the blade 11. This forms a highly reliable locking mechanism (preventing the blade 11 from rotating clockwise), effectively achieving the main objective of this utility model. As for... Figure 4D As can be seen from the details of the blade 11 shown, there is an over-rotation limiting structure 119 in this example, which is used to cooperate with the rotation locking structure 14 in the first position when the blade 11 is in the unfolded use state, so that the rotation locking structure 14 prevents the blade 11 from rotating excessively in the non-folding direction (the 4D diagram shows excessive counterclockwise rotation).

[0032] And then by Figure 4A As can be seen, when the blade 11 is in the unfolded state, the space of the notch 118 on the back of the blade shown in this example allows the rotating locking structure 14 to rotate freely. Therefore, when using the folding knife, it is necessary to unlock it (i.e., enter an unlocked state) and return it to the folded storage state (e.g., to put it into storage). Figure 1D When ), it can be like Figure 4BAs shown in the construction details, the user can first rotate the rotating locking structure 14 to a second position (in this example, the user uses their right thumb to flick the protrusion 140 to compress the length of the elastic object 152, causing the rotating locking structure 14 to rotate counterclockwise), so that the notch 149 of the rotating locking structure 14 can be aligned with the second part 112 of the tail of the blade 11 (in this example, the outer edge is an arc-shaped fan). Since the first distance between the arc-shaped outer edge of the second part 112 of the tail of the blade 11 and the axis of the rotating shaft 13 is equal to or less than a preset length (for example, the vertical distance from the axis of the rotating shaft 13 to the surface of the notch 149 of the rotating locking structure 14 located in the second position), when the rotating locking structure 14 is in the second position and the blade 11 is rotated inward, the second part 112 of the tail of the blade 11 can pass through the aligned notch 149 without contact or with friction but with slight resistance. Therefore, when the rotating locking structure 14 is in the second position, the blade 11 can be rotated clockwise to release the lock, as follows: Figure 4C It enters the folded storage state as shown in the image (e.g.) Figure 1D (As shown). In other words, in the unlocked state, if the gap between the notch 149 of the rotating locking structure 14 and the second part 112 of the blade 11 is sufficient, the rotating locking structure 14 can partially rotate in the unlocked state. However, if it is insufficient to rotate to the second position and become locked, the distance between the edge of the second part of the blade and the first rotation axis center on the blade does not need to be the same (as long as it is equal to or less than the preset length). The force provided by the restoring force providing device 15 to continuously rotate the rotating locking structure 14 to the first position can be converted into the frictional force of the rotating locking structure 14 contacting the blade 11 when it partially rotates, thereby generating resistance to the rotation of the blade 11 and achieving the purpose of stabilizing the blade in a specific position.

[0033] and Figure 4AThe elastic element 152 is a compression spring that provides a restoring force to the moving object 151 when it contacts the rotating locking structure 14, along the third direction indicated by arrow 41. This restoring force allows the moving object 151 to move towards the rotating locking structure 14. Furthermore, because the shape of the lateral protrusion 154 and the second accommodating space 123 (which has a groove for accommodating the lateral protrusion 154) mates, the moving object 151 will not rotate when it moves towards the rotating locking structure 14. However, because the third surface 153 of the moving object 151 has a first helical structure or a first inclined surface structure, it can engage with the second helical structure or a second inclined surface structure on the fourth surface 144 of the rotating locking structure 14, causing the rotating locking structure 14 to rotate when the elastic element 152 pushes the moving object 151 towards the rotating locking structure 14. When the rotating locking structure 14 rotates toward the first position along the preset rotation direction (as shown by arrow 42 in the figure), the first surface 141 of the rotating locking structure 14, which reaches the first position, can finally contact the first part 110 of the blade 11, thereby fixing the two in the unfolded use state.

[0034] Additionally, to unlock the folding knife and return it to its folded state, the user can rotate the rotating locking structure 14 to a second position (in this example, the position where the user pushes it counterclockwise to the left with their right thumb). The aforementioned spiral or inclined structure allows the moving object 151 to slide backward, compressing the elastic object 152. Finally, the notch in the rotating locking structure 14 rotates to align with the second part 112 of the blade 11, allowing the second part 112 of the blade 11 to pass through the aligned notch 149 and enter. Figure 1D The folded storage state is shown. Besides the notch 149, the rotating locking structure 14 can also use grooves, holes, or similar retractable surfaces, as long as the curved edge of the blade's tail can pass through. And as shown... Figure 1D As can be clearly seen, when the blade 11 is in the folded and stored state, its third part 113 (in this example, another fan-shaped structure with an outer arc) contacts the rotating locking structure 14. Specifically, because the second distance between the outer arc of the third part 113 of the blade 11 and the axis of the rotating shaft 13 is designed to be less than the preset length and slightly less than the first distance, when the rotating locking structure 14 is in the second position and the blade 11 has rotated inward to the folded and stored state, and the user stops applying external force to the rotating locking structure 14, the restoring force provided by the restoring force providing device 15 to the rotating locking structure 14 will cause the rotating locking structure to rotate in the preset rotation direction, causing the second surface 142 of the notch 149 to contact the outer arc of the third part 113 of the blade 11, thus fixing it in the folded and stored state.

[0035] Of course, the restoring force providing device 15 can also be replaced by a torsion spring, eliminating the need for the moving part 151. The torsion spring can be fixed between the handle structure 12 and the rotating locking structure 14, directly providing the restoring force required by the rotating locking structure 14. This allows the rotating locking structure 14 to contact and abut against the first part 110 of the blade 11 with its first surface 141, thus forming a locking mechanism (preventing the blade 11 from rotating clockwise or counterclockwise), thereby achieving the main purpose of this utility model. Other variations of the restoring force providing device 15 are possible, but they are all simple variations of the two embodiments described above, and will not be elaborated here. Furthermore, this illustration uses the protrusion 140 on the rotating locking structure 14 for the user to operate; however, other variations are also possible. Figure 1A , Figure 1B , Figure 1C and Figure 1D The design of the series removes the protrusion 140 and only creates texture on the surface of the rotating locking structure 14, thereby increasing friction to facilitate turning.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A foldable cutting implement, characterized in that, include: The blade has a first rotating structure. A tool holder structure, wherein the tool holder structure has a second rotating structure; A rotating shaft extends along a first direction and combines the first rotating structure and the second rotating structure, so that the blade and the handle structure can rotate about the first direction as the axis, thereby switching between an unfolded use state and a folded storage state. as well as A rotating locking structure is disposed in the first accommodating space of the handle structure and rotates with the second direction as the axis. When rotated to the first position, the rotating locking structure contacts the first part of the blade and fixes the blade in the unfolded use state. When rotated to the second position, the rotating locking structure provides a notch to allow the second part of the blade to rotate through and switch to the folded storage state. The second direction is different from the first direction.

2. The foldable cutting instrument of claim 1, wherein, It also includes a restoring force providing device, which is disposed in the second accommodating space in the handle structure. The restoring force providing device contacts the rotating locking structure and provides a restoring force to the rotating locking structure, causing the rotating locking structure to rotate toward the first position in a preset rotation direction. The first surface of the rotating locking structure that reaches the first position contacts the first part of the blade and is fixed in the unfolded use state.

3. The foldable cutting instrument of claim 2, wherein, The handle structure includes a first handle portion and a second handle portion, with a first accommodating space and a second accommodating space provided between the first handle portion and the second handle portion. The restoring force providing device includes an elastic object and a movable object. The third surface of the movable object contacts the fourth surface of the rotating locking structure. The elastic object provides the restoring force to the movable object and the rotating locking structure. The restoring force can cause the movable object to move toward the rotating locking structure, thereby causing the rotating locking structure to rotate toward the first position along the preset rotation direction. This causes the first surface of the rotating locking structure, which reaches the first position, to contact the first part of the blade, thereby fixing both in the unfolded use state.

4. The foldable cutting instrument of claim 3, wherein, The third surface of the movable object is provided with a part of a spiral structure or a slope structure, which engages with another part of a spiral structure or another slope structure on the fourth surface of the rotary locking structure, so that when the elastic object pushes the movable object toward the rotary locking structure, the rotary locking structure can be rotated. The elastic object is a compression spring.

5. The collapsible cutting instrument of claim 1, wherein, The main body of the rotating locking structure is a cylinder with the notch, and the aspect ratio of the cylinder is less than or equal to 1.

6. The collapsible cutting instrument of claim 1, wherein, The first rotating structure and the second rotating structure are respectively completed by the first round hole structure and the second round hole structure on the blade and the handle structure. The rotating shaft extends along the first direction and passes through the first round hole structure and the second round hole structure, so that the blade and the handle structure can rotate on a blade rotation plane with the rotating shaft as the axis. The second direction is orthogonal to the first direction. The rotating shaft of the rotating locking structure is parallel to the blade rotation plane or located on the blade rotation plane.

7. The collapsible cutting instrument of claim 2, wherein, When rotated to the first position, the first surface of the rotating locking structure contacts the first part of the blade and prevents the blade from rotating. When rotated to the second position, the notch of the rotating locking structure aligns with the second part of the blade, allowing the second part of the blade to rotate through to the folded storage state.

8. The foldable cutting instrument of claim 7, wherein, When the rotating locking structure is rotated to the second position, the notch of the rotating locking structure is aligned with the second part of the blade. The outer edge of the second part of the blade is an arc, and the first distance between the outer edge of the arc of the second part and the axis of the rotating shaft is equal to or less than a preset length. This allows the second part to pass through the aligned notch and enter the folded storage state when the rotating locking structure is in the second position and the blade rotates inward.

9. The foldable cutting instrument of claim 8, wherein, When the blade enters the folded storage state, its third part contacts the rotating locking structure. The outer edge of the third part is another arc. The second distance between the outer edge of the arc of the third part and the axis of the rotating shaft is less than the preset length and less than the first distance. The restoring force provided by the restoring force providing device to the rotating locking structure causes the rotating locking structure to rotate in the preset rotation direction, so that the second surface of the notch contacts the outer edge of the arc of the third part of the blade and is fixed in the folded storage state.

10. The collapsible cutting instrument of claim 1, wherein, The rotating locking structure is disposed in the tool holder structure and located around the rotating shaft, and is located on the side closer to the tail of the tool holder structure.

11. The collapsible cutting instrument of claim 10, wherein, The rotating locking structure is disposed on the upper half of the handle structure, and is used to contact the back end of the blade when the blade is fixed in the unfolded use state.

12. The collapsible cutting instrument of claim 1, wherein, It also includes a restoring force providing device, which is a torsion spring. The torsion spring is disposed in the second accommodating space in the handle structure. The torsion spring contacts the rotating locking structure and provides a restoring force to the rotating locking structure, causing the rotating locking structure to rotate toward the first position in a preset rotation direction. When the rotating locking structure reaches the first position, it contacts the first part of the blade and is fixed in the unfolded use state.

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