Folding cutter structure
By designing safety components and limit buckles, the problem of a single fixed limit structure for folding knives is solved, achieving double locking and improving the stability and safety of folding knives.
Patent Information
- Application Number
- CN202520117601.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-18
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-01-18
AI Technical Summary
The current limiting structure design of folding knives has a single fixed state and lacks a dual locking function, resulting in limited safety.
It adopts a safety component, including a sliding buckle and a limit buckle. The sliding buckle cooperates with the limit groove and hook groove to achieve dual-state fixation, and the limit buckle and elastic element improve stability. Combined with the fixed shaft with reverse thread design, it prevents loosening.
It achieves stable fixation of the folding knife in both unfolded and folded states, improving its service life and safety, and features a dual locking function.
Smart Images
Figure CN223834563U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cutting tool technology, specifically a folding cutting tool structure. Background Technology
[0002] Folding knives are a type of portable knife, and are most commonly used due to their high safety profile when folded with the blade facing inward. To maintain their folded and unfolded forms, a locking mechanism is essential. Currently, most methods use a spring-loaded clip on the underside of the handle, relying on the elastic deformation of a metal clip for locking. However, this design has limitations; if too tight, it won't open, and if too loose, it's prone to failure. Furthermore, due to structural limitations, it can only be used for locking in a single state, lacking a double-locking function, thus limiting safety. Therefore, this paper proposes a new folding knife structure. Utility Model Content
[0003] The purpose of this invention is to provide a folding cutter structure to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a folding knife structure, including a knife shell and a blade, wherein the blade is rotatably connected to the knife shell, and the blade can be wrapped by the knife shell after rotation. A safety component is provided on the knife shell, and the safety component fixes the blade in either an unfolded or folded state by limiting the end face of the blade, that is, it can fix the position in both states.
[0005] Preferably, the safety component includes a sliding buckle that can slide on the blade housing. A limiting groove is opened on one side of the tail end of the blade, and a limiting hook is opened on the other side. The sliding buckle is provided with a hook groove that cooperates with the limiting hook. By sliding the sliding buckle to different positions, it can cooperate with the limiting groove or the limiting hook to achieve the limiting effect.
[0006] Preferably, the safety component further includes a limiting buckle, which limits the position of the sliding buckle. That is, the limiting buckle has at least two positioning areas for enabling the blade to rotate freely and be fixed in position.
[0007] Preferably, the limiting buckle and the blade housing are connected by a hinge, and the end face of the positioning area that contacts the sliding buckle is a chamfered surface that can slide and fit, thereby improving the convenience of use.
[0008] Preferably, at least one elastic element is provided between the sliding buckle and the blade housing, and between the limiting buckle and the blade housing, respectively, to meet the requirement of automatic reset.
[0009] Preferably, two springs are provided between the sliding buckle and the blade housing, with one end of each spring inserted into a positioning pin on the end face of the sliding buckle, thereby improving stability.
[0010] Preferably, the blade is installed on the blade housing via a fixed shaft. The fixed shaft includes an outer nut, a shaft, and an inner threaded component. The outer nut is helically pressed against the outer wall of the blade housing, and the inner threaded component is helically pressed against the outer wall of the outer nut. The outer nut and the inner threaded component are screwed in opposite directions to ensure a certain anti-loosening effect.
[0011] Preferably, the blade housing is further provided with a retaining plate.
[0012] Preferably, the blade housing is equipped with a back clip that can be elastically reset to improve portability.
[0013] Compared with the prior art, the beneficial effects of this utility model are: compared with the traditional folding knife, the structure of this application can achieve stable position fixation when folding and unfolding, and its structure does not affect the normal use of the knife. In addition, the rotating fixed shaft of this application adopts a double-screw reverse thread design, which has a certain anti-loosening effect and can improve the service life. The structure of this application can be attached to existing folding knife types, thereby achieving a double locking function and improving safety. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of a complete form of the present utility model;
[0015] Figure 2 This is a diagram showing the unfolded state of the blade shell and blade of this utility model;
[0016] Figure 3 This is a diagram showing the folded state of the blade and the blade of this utility model;
[0017] Figure 4 This is an exploded view of the blade casing of this utility model;
[0018] Figure 5 This is a longitudinal sectional view of the present invention;
[0019] Figure 6 This is an explosion diagram of the blade and the blade of this utility model;
[0020] Figure 7 This is a schematic diagram of the blade engaging in the folded state of this utility model;
[0021] Figure 8 This is a schematic diagram of the structure of the limiting buckle of this utility model;
[0022] Figure 9 This is a partial enlarged view of the sliding buckle of this utility model;
[0023] Figure 10 This is an exploded view of the installation of the limiting buckle of this utility model.
[0024] Figure 11This is a schematic diagram of the installation of the spring inside the blade housing of this utility model;
[0025] Figure 12 This is a structural diagram of the sliding buckle of this utility model;
[0026] Figure 13 This is a structural diagram of the installation of the blade shell and the sliding buckle of this utility model;
[0027] Figure 14 This is an exploded view of the fixed shaft structure of this utility model;
[0028] Figure 15 This is a structural diagram of the mounting back clip of this utility model.
[0029] In the diagram: 1. Blade housing, 2. Blade, 201. Limiting groove, 202. Limiting hook, 3. Safety assembly, 301. Sliding buckle, 302. Hook groove, 303. Positioning plate, 304. Limiting buckle, 305. Positioning area, 306. Beveled surface, 307. Spring, 308. Positioning pin, 4. Fixed shaft, 401. Outer nut, 402. Shaft, 403. Internal thread, 5. Clamping plate, 6. Back clamp. Detailed Implementation
[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0031] For the folding tool structure, please refer to [link / reference]. Figure 1-15 .
[0032] Example 1 includes a blade housing 1 and a blade 2. In this application, the blade housing 1 is not particularly limited to any existing folding knife form; that is, the blade 2 rotates with the blade housing 1, and the blade 2, after rotation, is enclosed by the blade housing 1, thus protecting the blade after folding. A safety component 3 is provided on the blade housing 1.
[0033] The safety component 3 fixes the blade 2 in an unfolded or folded state by limiting the end face of the blade 2.
[0034] Specifically, the unfolded state of blade 2 is as follows: Figure 2 As shown, the folded state is Figure 3As shown in the figure, the blade tip and handle are not fully shown so that this structure can be adapted to existing folding knife types and will not restrict the shape of the handle and blade 2, especially the position of the blade tip. In addition, the blade 2 and the screws and other components on the blade shell 1 are only for assembly and are not necessary technical features that limit the technical solution. Different products will have different assembly schemes, which are all common structures and will not affect the implementation of this solution in this application.
[0035] The specific solution for achieving state fixation using insurance component 3 is as follows:
[0036] like Figure 4-6 The safety component 3 includes a sliding buckle 301 that can slide on the blade housing 1. The tail end of the blade 2 has a limiting groove 201 on one side and a limiting hook 202 on the other side. The sliding buckle 301 is provided with a hook groove 302 that cooperates with the limiting hook 102. It should be noted that the sliding buckle 301 can slide on the blade housing 1 by the sliding space provided by the profile shape of the blade housing 1. This sliding space requires that it can only slide horizontally and there is no space for vertical movement. As shown in the figure, both ends of the sliding buckle 301 (or one end) are connected by a knob that extends to the outside of the blade housing 1 through a threaded connection so as to carry out the sliding operation.
[0037] like Figure 5 As shown, when the blade 2 is unfolded, the lower end face of the sliding buckle 301 contacts the limiting groove 201. At this time, the blade 2 cannot rotate clockwise due to the restriction of the outer surface of the blade housing 1 profile (a common method). The sliding buckle 301 also cannot rotate counterclockwise because it is locked with the limiting groove 201, thus keeping it unfolded and fixed.
[0038] like Figure 7 As shown, when the blade 2 is folded, the blade 2 is restricted from rotating counterclockwise by the inner surface of the blade housing 1 profile (a common method), and the clockwise hook groove 302 contacts the limiting hook 202, preventing it from rotating and thus keeping it folded and fixed.
[0039] Furthermore, in the above state, it can be seen that the contact surfaces (the lower end surface of the slide buckle 301 and the limiting groove 201, the pin hook groove 302 and the limiting hook 202) are all flat surfaces, and rotation cannot cause the slide buckle 301 to move laterally, so it can maintain a stable state.
[0040] When a state change is required, simply move the slider 301 to the right beforehand.
[0041] Example 2: Although the sliding buckle 301 can also fix its position through the friction between it and the blade housing 1 profile, this method is not stable enough and lacks safety under long-term use.
[0042] Therefore, based on Embodiment 1, the following content is added: the safety component 3 further includes a limiting buckle 304, which is disposed on the blade housing 1; that is, the profile of the blade housing 1 provides space for placing the limiting buckle 304. Figure 8 and 10 As shown. The limiting buckle 304 is provided with at least two positioning areas 305 to enable the blade 2 to rotate freely and be fixed in position. That is, when the sliding buckle 301 is located in the left positioning area 305, it is in a limiting state. When it is located in the right positioning area 305, it will not contact the blade 2, and the rotation of the blade 2 will not be affected.
[0043] There are several ways to install the limit buckle 304 and the blade shell 1, such as snap-fit or hinge.
[0044] To further improve the ease of use and security, this application proposes a specific implementation method based on Embodiment 2, namely Embodiment 3.
[0045] Specifically, the limiting buckle 304 and the blade housing 1 are connected by a hinge (i.e., rotatably connected via a hinge shaft, such as...). Figure 10 When the end of the limit buckle 304 is pressed, the front end of the limit buckle 304 will lift up, at which time the sliding buckle 301 can be moved freely to change which positioning zone 305 it is in.
[0046] like Figure 11 A spring is also provided between the limit buckle 304 and the blade housing 1 to prevent the limit buckle 304 from tilting up at will (at least one elastic element is provided between the limit buckle 304 and the blade housing 1), so that it can remain closed when no force is applied.
[0047] Furthermore, to improve ease of use, the end face of the positioning area 305 that contacts the sliding buckle 301 is a chamfered surface 306 that allows for sliding engagement (e.g., Figure 9 and 13 When it is necessary to slide the slider 301 to the right, you can simply push and pull the slider 301. At this time, it will naturally lift up under the pressure of the beveled surface 306.
[0048] Example 4 shows that when the slider 301 is located at the left end, it is in a fixed state. Therefore, based on the above examples, the convenience of use can be further improved.
[0049] At least one elastic element is provided between the sliding buckle 301 and the blade housing 1. For balance, this application proposes a symmetrical design, with two springs 307 provided between the sliding buckle 301 and the blade housing 1. Furthermore, to facilitate assembly (e.g.... Figure 12The spring 307 is inserted into the positioning pin 308 on the end face of the slide buckle 301. The slide buckle 301 and the positioning pin 308 are connected by threads. In addition, in order to prevent the spring 307 from twisting, a positioning plate 303 is also connected to the blade housing 1 by screws, thereby forming a space for the spring 307 to deform with the inside of the blade housing 1 profile.
[0050] Since folding knives are basically rotating around an axis, the following anti-loosening designs can be added to the above embodiments to prevent them from coming loose.
[0051] That is, the blade 2 is installed on the blade housing 1 via a fixed shaft 4, the fixed shaft 4 including an outer nut 401, a shaft 402, and an internal thread 403, such as Figure 14 and 15 As shown, the outer nut 401 is spirally pressed against the outer wall of the blade housing 1, and the inner thread 403 is spirally pressed against the outer wall of the outer nut 401. The outer nut 401 and the inner thread 403 are screwed in opposite directions. This reverse thread design can improve the anti-loosening effect under long-term rotation and vibration conditions.
[0052] Regarding the above embodiments, this application can incorporate existing designs to prevent the blade 2 from rotating, such as a retaining plate 5 (e.g., on the blade housing 1). Figure 5 The locking piece 5 is a flexible metal and is fixedly connected to the blade shell 1 (right end). When the blade 2 is unfolded, the locking piece 5 is not restricted by the blade 2 and its left end will be slightly raised (its shape is that the left end is raised. Because it is made of flexible metal, pressing hard when folding will not affect the folding of the blade 2), thereby locking its left end with the right end of the blade 2 to prevent the blade 2 from rotating and folding.
[0053] Therefore, the structure of this application has a dual locking effect compared to existing cutting tools when in use.
[0054] Similarly, the blade housing 1 described in the above embodiments is provided with a back clip 6 that can be elastically reset. The specific installation method is similar to that of the limit buckle 304 and the blade housing 1. The back clip 6 is hinged to the blade housing 1 and a spring is provided between them to prevent it from tilting up at will.
[0055] In practical use, when the blade 2 is required to be in a fixed state, the sliding latch 301 should be in the positioning area 305 on the left. If not, simply press the end of the limiting latch 304. At this time, the sliding latch 301 will move to the left under the action of the spring 307. When you want to change the state, simply push or pull the sliding latch 301 to the right. Then rotate the blade 2 to the predetermined state, and then press the end of the limiting latch 304 again.
[0056] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A folding knife structure, comprising a blade housing (1) and a blade (2), wherein the blade (2) is rotatably connected to the blade housing (1), and the blade (2) can be enclosed by the blade housing (1) after rotation, characterized in that: The blade shell (1) is provided with a safety component (3). The safety component (3) fixes the blade (2) in an unfolded or folded state by limiting the end face of the blade (2); the safety component (3) includes a sliding buckle (301) that can slide on the blade shell (1), a limiting groove (201) is opened on one side of the tail end of the blade (2), a limiting hook (202) is opened on the other side, and the sliding buckle (301) is provided with a hook groove (302) that cooperates with the limiting hook (102); the safety component (3) also includes a limiting buckle (304), and the limiting buckle (304) is provided with at least two positioning areas (305) for realizing the free rotation and fixed position of the blade (2).
2. The folding cutter structure according to claim 1, characterized in that: The limiting buckle (304) is hinged to the blade shell (1), and the end face of the positioning area (305) that contacts the sliding buckle (301) is a chamfered surface (306) that can slide and engage.
3. The folding cutter structure according to claim 2, characterized in that: At least one elastic element is provided between the sliding buckle (301) and the blade shell (1), and between the limiting buckle (304) and the blade shell (1).
4. The folding cutter structure according to claim 3, characterized in that: Two springs (307) are provided between the sliding buckle (301) and the blade shell (1), and one end of the spring (307) is inserted into the positioning pin (308) on the end face of the sliding buckle (301).
5. A folding cutter structure according to any one of claims 1-4, characterized in that: The blade (2) is installed on the blade housing (1) via a fixed shaft (4). The fixed shaft (4) includes an outer nut (401), a shaft (402), and an inner thread (403). The outer nut (401) is spirally pressed against the outer wall of the blade housing (1), and the inner thread (403) is spirally pressed against the outer wall of the outer nut (401). The screwing directions of the outer nut (401) and the inner thread (403) are opposite.
6. A folding cutter structure according to any one of claims 1-4, characterized in that: The blade housing (1) is also provided with a retaining plate (5).
7. A folding cutter structure according to any one of claims 1-4, characterized in that: The blade housing (1) is provided with a back clip (6) that can be elastically reset.