Clamping device and utility knife

Abstract

This utility model belongs to the field of cutting tool technology, and discloses a clamping device and a utility knife. The clamping device includes a first cover, a positioning post, a locking member, and an elastic member. The first cover has an extension and a fixing part along a first direction. The positioning post is disposed on the extension, and one end of the blade is sleeved on the positioning post through a positioning hole, while the other end extends in the first direction. The locking member is movably disposed on the first cover and has a first position and a second position. When the locking member is in the first position, the locking member and the extension together clamp the blade. When the locking member is in the second position, the locking member is separated from the extension, and the blade can be installed or removed from the positioning post. The elastic member is disposed on the fixing part. When the locking member is in the second position, it is compressed, causing the elastic member to drive the locking member to move from the second position to the first position. The utility knife includes a second cover, a push button, a blade shell, a blade, and the aforementioned clamping device. This utility model not only facilitates blade installation but also provides strong stability.

Description

Technical Field

[0001] This utility model relates to the field of cutting tool technology, and in particular to a clamping device and a utility knife. Background Technology

[0002] Currently, in daily life and production, people often need to cut or scratch objects. Utility knives are one of the most common cutting tools due to their sharp blades and pointed tips. Furthermore, the blade tip can be repaired multiple times by breaking off the end after damage, and their low price makes them widely used. However, utility knives often require blade replacement. To facilitate blade replacement, a positioning hole is provided at the end of the blade, and a fixing post is installed on the sliding part. Simply slide the blade through the positioning hole and onto the fixing post to complete the installation.

[0003] However, due to vibrations, lateral forces, and friction from repeated disassembly and assembly during cutting, the clearance between the positioning hole and the fixing post will gradually increase, causing the blade to loosen and wobble. Once the blade is installed unstably, it will not only affect the cutting accuracy, but may even suddenly fall off during use, causing safety accidents such as cuts, making it difficult to meet users' needs for tool stability and safety.

[0004] Therefore, there is an urgent need to provide a clamping device and a utility knife to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a clamping device and a utility knife that not only facilitates blade installation but also provides strong stability.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A clamping device for clamping and fixing a blade, characterized in that it comprises:

[0008] The first cover has an extension and a fixing part connected along a first direction;

[0009] A positioning post is provided in the extension portion, one end of the blade is sleeved on the positioning post through a positioning hole, and the other end extends in the first direction;

[0010] A locking member is movably disposed on the first cover. The locking member has a first position and a second position. When the locking member is in the first position, the locking member and the extension clamp the blade together. When the locking member is in the second position, the locking member is away from the extension, and the blade can be installed or removed from the positioning post.

[0011] An elastic element is disposed on the fixed part. When the locking member is in the second position, the elastic element is compressed, so that the elastic element can drive the locking member to move from the second position to the first position.

[0012] Preferably, the locking member includes a first driving block, a first connecting post, and a first pressure plate connected in sequence. The first cover has a through hole along a second direction, which is perpendicular to the first direction. The first connecting post passes through the through hole. The first driving block and the first pressure plate are located on both sides of the first cover. When the locking member is in the first position, the first pressure plate presses against the surface of the blade. When the first driving block is moved away from the extension, the first connecting post can slide within the through hole, causing the first pressure plate to separate from the blade.

[0013] Preferably, the first cover is provided with a first limiting groove, the through hole is connected to the bottom of the first limiting groove, the elastic element is disposed in the first limiting groove, and the first driving block is located in the first limiting groove and can move in the first limiting groove to squeeze or release the elastic element.

[0014] Preferably, the clamping device further includes a cover plate with a groove, which is fitted into the first limiting groove, such that the groove communicates with the first limiting groove to form a sliding channel, and the first driving block can slide along the sliding channel to squeeze or release the elastic element.

[0015] Preferably, the elastic element includes two elastic arms arranged at an angle. When the locking element is in the first position, one of the elastic arms abuts against the first driving block, and the other elastic arm abuts against the inner wall of the first limiting groove.

[0016] Preferably, the locking member includes a second driving block, a second connecting post, and a second pressure plate connected in sequence. The second connecting post passes through and is rotatably connected to the fixing part along a second direction, which is perpendicular to the first direction. The second driving block and the second pressure plate are located on both sides of the fixing part. When the locking member is in the first position, the second pressure plate presses against the surface of the blade, and the second driving block moves away from the extension. The second connecting post rotates synchronously, causing the second pressure plate to rotate and separate from the blade.

[0017] Preferably, the first cover is provided with a second limiting groove, the elastic element is disposed in the second limiting groove, and the second driving block is located in the second limiting groove and can rotate in the second limiting groove to squeeze or release the elastic element.

[0018] Preferably, the elastic element is a spring sheet, and one end of the elastic element is fixedly connected to the inner wall of the second limiting groove. When the locking element is in the first position, the second driving block is sandwiched between one inner wall of the second limiting groove and the elastic element.

[0019] A utility knife includes a second cover, a push button, a blade shell, the blade, and the aforementioned clamping device. The blade shell has a receiving cavity and a groove and an opening communicating with the receiving cavity. The clamping device is disposed in the receiving cavity. One end of the blade is fixed to the clamping device, and the other end extends toward the opening. The second cover and the first cover are fastened together to form a base. The push button is connected to the second cover and extends out of the receiving cavity through the groove. The push button can slide along the groove to push the base to move within the receiving cavity and drive the blade to extend out of or retract from the opening into the receiving cavity.

[0020] Preferably, the accommodating cavity is provided with a knife holder with meshing teeth, and a leaf spring is provided between the second cover and the first cover, the leaf spring being able to engage or disengage with the meshing teeth during movement.

[0021] The beneficial effects of this utility model are:

[0022] This invention provides a clamping device that uses a positioning pin to initially position the blade, and then, in conjunction with a locking member in the first position, clamps the blade together with the extension, forming a stable double-fixing structure. This enhances the blade's fixing effect, preventing it from loosening or shifting due to vibration or lateral forces during cutting. When the blade needs to be replaced, simply moving the locking member to the second position allows for easy disassembly and assembly, making operation convenient. Simultaneously, the elastic element enables the locking member to quickly return to the clamping state, further improving the ease of blade replacement.

[0023] This utility model provides a utility knife. By integrating a clamping device into the receiving cavity of the blade shell, one end of the blade is firmly fixed by the clamping device, while the other end can extend or retract from the opening as the push button slides. The second cover is fastened to the first cover to form an integral frame, ensuring the stability of the internal structure. The push button is exposed on the blade shell through a sliding groove for easy user operation. Its sliding motion drives the base and blade to move synchronously, realizing the extension and retraction control of the blade. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the clamping device described in Embodiment 1 of this utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the blade fixed to the clamping device according to Embodiment 1 of this utility model;

[0026] Figure 3This is a schematic diagram of the locking component according to Embodiment 1 of this utility model;

[0027] Figure 4 This is a partial structural schematic diagram of the clamping device described in Embodiment 1 of this utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the elastic element described in Embodiment 1 of this utility model;

[0029] Figure 6 This is a partial structural schematic diagram of the utility knife described in Embodiment 1 of this utility model;

[0030] Figure 7 This is a schematic diagram of the structure of the blade fixed to the clamping device according to Embodiment 2 of this utility model;

[0031] Figure 8 This is a cross-sectional view of the clamping device described in Embodiment 2 of this utility model;

[0032] Figure 9 This is a schematic diagram of the clamping device described in Embodiment 2 of this utility model;

[0033] Figure 10 This is a schematic diagram of the locking component described in Embodiment 2 of this utility model.

[0034] In the picture:

[0035] 1. Base; 11. First cover; 110. Through hole; 111. Extension; 112. Fixing part; 1100. First limiting groove; 1101. First groove; 1102. Second groove; 1110. Second limiting groove; 12. Second cover;

[0036] 2. Positioning post;

[0037] 3. Locking component; 31. First drive block; 311. Sliding part; 3111. Anti-slip strip; 312. Pressing part; 32. First connecting post; 33. First pressure plate; 34. Second drive block; 35. Second connecting post; 36. Second pressure plate;

[0038] 4. Elastic element; 41. Elastic arm;

[0039] 5. Cover plate; 50. Groove;

[0040] 6. Push button;

[0041] 7. Leaf spring;

[0042] 100. Blade. Detailed Implementation

[0043] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0044] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the first feature can include the feature and the first feature being in direct contact, or it can include the feature and the first feature not being in direct contact but being in contact through another feature between them. Furthermore, "above," "over," and "on top" of the first feature includes the feature being directly above or diagonally above the first feature, or simply indicates that the feature is at a higher horizontal level than the first feature. "Below," "below," and "under" the first feature includes the feature being directly below or diagonally below the first feature, or simply indicates that the feature is at a lower horizontal level than the first feature.

[0046] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0047] This utility model provides a clamping device and a utility knife, which not only facilitates blade installation but also provides strong stability.

[0048] Example 1

[0049] like Figures 1 to 5As shown, this embodiment provides a clamping device for clamping and fixing a blade 100, including a first cover 11, a positioning post 2, a locking member 3, and an elastic member 4. The first cover 11 has an extension 111 and a fixing part 112 connected along a first direction. The positioning post 2 is disposed on the extension 111. One end of the blade 100 is sleeved on the positioning post 2 through a positioning hole, and the other end extends in the first direction. The locking member 3 is movably disposed on the first cover 11. The locking member 3 has a first position and a second position. When the locking member 3 is in the first position, the locking member 3 and the extension 111 jointly clamp the blade 100. When the locking member 3 is in the second position, the locking member 3 is away from the extension 111, and the blade 100 can be installed or removed from the positioning post 2. The elastic member 4 is disposed on the fixing part 112. When the locking member 3 is in the second position, the elastic member 4 is squeezed, so that the elastic member 4 can drive the locking member 3 to move from the second position to the first position. The first direction is the length direction of the first cover 11.

[0050] In this embodiment, the positioning post 2 initially positions the blade 100. Then, in the first position, the locking member 3, together with the extension 111, clamps the blade 100, forming a stable double-fixing structure. This enhances the fixing effect of the blade 100, preventing it from loosening or shifting due to vibration or lateral force during cutting. When the blade 100 needs to be replaced, simply moving the locking member 3 to the second position allows for easy disassembly and assembly, making the operation convenient. Simultaneously, the elastic member 4 can drive the locking member 3 to quickly return to the clamping state, further improving the convenience of replacing the blade 100.

[0051] Specifically, such as Figures 1-4 As shown, the locking member 3 includes a first driving block 31, a first connecting post 32, and a first pressure plate 33 connected in sequence. The first cover 11 has a through hole 110 along a second direction, which is perpendicular to the first direction. The first connecting post 32 passes through the through hole 110. The first driving block 31 and the first pressure plate 33 are located on both sides of the first cover 11. When the locking member 3 is in the first position, the first pressure plate 33 presses against the surface of the blade 100, and the first driving block 31 moves away from the extension. The first connecting post 32 can slide within the through hole 110, causing the first pressure plate 33 to separate from the blade 100. Through the sliding engagement of the first connecting post 32 and the through hole 110, the locking member 3 forms a stable linear motion mechanism. The second direction is the thickness direction of the first cover 11.

[0052] When the first drive block 31 is subjected to force, it drives the first connecting post 32 to slide precisely along the through hole 110, enabling the first pressure plate 33 to perform parallel pressing or separation actions. The contact surface between the first pressure plate 33 and the blade 100 always maintains uniform contact, ensuring a reasonable distribution of clamping force; the guiding effect of the first connecting post 32 within the through hole 110 prevents the deflection of the locking element 3, ensuring smooth operation. The exposed design of the first drive block 31 facilitates finger application of force, while the linear movement trajectory of the first pressure plate 33 allows it to completely disengage from the interference area when releasing the blade 100. This linear locking mechanism simplifies operation while improving the clamping stability and ease of assembly and disassembly of the blade 100 through precise mechanical coordination.

[0053] In this embodiment, the first driving block 31, the first connecting post 32, and the first pressure plate 33 are all cuboids.

[0054] More specifically, such as Figure 1 and Figure 3 As shown, the first cover 11 is provided with a first limiting groove 1100, and a through hole 110 communicates with the bottom of the first limiting groove 1100. The elastic element 4 is disposed in the first limiting groove 1100, and the first driving block 31 is located in the first limiting groove 1100 and can move within the first limiting groove 1100 to squeeze or release the elastic element 4. The first limiting groove 1100 on the first cover 11 provides precise installation and movement space for the elastic element 4 and the first driving block 31, avoiding misalignment of the elastic element 4 during operation and ensuring that the elastic element 4 is always in an effectively drivable state.

[0055] More specifically, such as Figure 1 and Figure 4 As shown, the clamping device also includes a cover plate 5 with a groove 50. The cover plate 5 is embedded in the first limiting groove 1100, so that the groove 50 and the first limiting groove 1100 communicate to form a sliding channel. The first driving block 31 can slide along the sliding channel to squeeze or release the elastic member 4. The cover plate 5 embedded in the first limiting groove 1100 not only strengthens the overall structure, but the sliding channel formed by its groove 50 and the first limiting groove 1100 also provides a stable guide for the first driving block 31, avoiding sliding deviation and making the pushing and pulling operation of the locking member 3 stable.

[0056] In this embodiment, refer to Figure 3 and Figure 4The first driving block 31 includes a sliding part 311 and a pressing part 312. The pressing part 312 is connected to the bottom surface of the sliding part 311 and its two ends protrude from opposite sides of the sliding part 311. The first limiting groove 1100 includes a first groove 1101 and a second groove 1102. The first groove 1101 is connected to the second groove 1102 along a first direction. The elastic element 4 is disposed in the first groove 1101. The pressing part 312 is located in the first groove 1101. The through hole 110 is connected to the second groove 1102. The cover plate 5 is embedded in the first groove 1101 so that the groove 50 is connected to the second groove 1102 to form a sliding channel. The sliding part 311 can move in the sliding channel to drive the pressing part 312 to press or release the elastic element 4. The pressing part 312 protrudes from both sides of the sliding part 311, increasing the contact area with the elastic element 4, making the elastic element 4 more evenly stressed, and avoiding a reduction in energy storage efficiency.

[0057] In this embodiment, the surface of the sliding part 311 is also provided with a plurality of anti-slip strips 3111, which allows the user to obtain greater friction when operating the first drive block 31, effectively preventing fingers from slipping, thereby controlling the movement of the locking member 3 more precisely.

[0058] More specifically, such as Figure 1 and Figure 5 As shown, the elastic element 4 includes two elastic arms 41 arranged at an angle. When the locking element 3 is in the first position, one elastic arm 41 abuts against the first driving block 31, and the other elastic arm 41 abuts against the inner wall of the first limiting groove 1100. This V-shaped elastic element 4 not only makes the elastic force distribution more uniform, but also effectively buffers the vibration impact during cutting through bidirectional force. The synergistic effect of the two elastic arms 41 improves the clamping stability of the first pressure plate 33 on the blade 100, while ensuring that the locking element 3 can obtain sufficient rebound force in the second position. The angled design of the elastic arms 41 also optimizes the space utilization of the first groove 1101, making the overall structure more compact and reliable.

[0059] In this embodiment, one elastic arm 41 abuts against the pressing part 312, and the other elastic arm 41 abuts against the inner wall of the first groove 1101.

[0060] like Figure 6 As shown, this embodiment also provides a utility knife, including a second cover 12, a push button 6, a blade shell, a blade 100, and the aforementioned clamping device. The blade shell has a receiving cavity and a groove and an opening communicating with the receiving cavity. The clamping device is disposed in the receiving cavity. One end of the blade 100 is fixed to the clamping device, and the other end extends toward the opening. The second cover 12 and the first cover 11 are engaged to form a base 1. The push button 6 is connected to the second cover 12 and extends out of the receiving cavity through the groove. The push button 6 can slide along the groove to push the base 1 to move in the receiving cavity and drive the blade 100 to extend out of or retract into the receiving cavity from the opening.

[0061] The utility knife provided in this embodiment integrates a clamping device into the receiving cavity of the blade shell, so that one end of the blade 100 is firmly fixed by the clamping device, while the other end can extend or retract from the opening as the push button 6 slides. The second cover 12 and the first cover 11 are fastened together to form an integral frame, ensuring the stability of the internal structure; the push button 6 is exposed on the blade shell through a sliding groove for easy user operation, and its sliding causes the base 1 and the blade 100 to move synchronously, realizing the extension and retraction control of the blade 100.

[0062] Specifically, the accommodating cavity is equipped with a blade holder with meshing teeth, and a leaf spring 7 is provided between the second cover 12 and the first cover 11. The leaf spring 7 can engage or disengage with the meshing teeth during movement. This not only prevents the blade 100 from accidentally retracting during use, but also provides the user with more precise control over the extension length of the blade 100. At the same time, the elastic characteristics of the leaf spring 7 ensure the smoothness of the engagement action, while maintaining sufficient holding force so that the blade 100 does not shift during cutting operations.

[0063] Example 2

[0064] Figures 7 to 10 Embodiment 2 is shown, in which components that are the same as or corresponding to those in Embodiment 1 are represented by the same reference numerals as those in Embodiment 1. For simplicity, only the differences between Embodiment 2 and Embodiment 1 are described. The differences are as follows:

[0065] The locking member 3 includes a second drive block 34, a second connecting post 35, and a second pressure plate 36 connected in sequence. The second connecting post 35 passes through and is rotatably connected to the fixing part 112 along a second direction, which is perpendicular to the first direction. The second drive block 34 and the second pressure plate 36 are located on both sides of the fixing part 112. When the locking member 3 is in the first position, the second pressure plate 36 presses against the surface of the blade 100. The second drive block 34 moves away from the extension part, and the second connecting post 35 rotates synchronously, causing the second pressure plate 36 to rotate and separate from the blade 100. Through the rotatable connection design between the second connecting post 35 and the fixing part 112, the locking member 3 achieves a rotary opening and closing action. When the second drive block 34 is pressed, it drives the second connecting post 35 to rotate, causing the second pressure plate 36 to disengage from the blade 100, achieving rapid release. The exposed design of the second drive block 34 facilitates one-handed operation, while the rotation trajectory of the second pressure plate 36 is optimized to ensure sufficient clamping force while avoiding interference with the disassembly and assembly path of the blade 100. The overall structure improves ease of operation while maintaining a stable clamping effect on the blade 100.

[0066] Specifically, the first cover 11 is provided with a second limiting groove 1110, the elastic element 4 is disposed in the second limiting groove 1110, and the second driving block 34 is located in the second limiting groove 1110 and can rotate within the second limiting groove 1110 to squeeze or release the elastic element 4. The second limiting groove 1110 provides a guiding space for the rotational movement of the second driving block 34. The elastic element 4 is built into the second limiting groove 1110, so that when the second driving block 34 rotates and squeezes, it can directly and efficiently transmit pressure to the elastic element 4, reduce the loss in the force transmission process, and greatly improve the elastic force output efficiency.

[0067] More specifically, the elastic element 4 is a spring sheet, with one end fixedly connected to the inner wall of the second limiting groove 1110. When the locking element 3 is in the first position, the second driving block 34 is clamped between one inner wall of the second limiting groove 1110 and the elastic element 4. When the spring sheet, which is fixed at one end, is deformed under force, the other end can swing flexibly and accumulate elastic potential energy. When the locking element 3 is in the first position, the clamping force generated by the spring sheet's rebound firmly clamps the second driving block 34 between the inner wall of the second limiting groove 1110 and itself, preventing the blade from loosening. At the same time, this design simplifies the assembly process. The characteristic of the spring sheet being fixed at one end makes it easier to install and less likely to fall off due to frequent operation, significantly improving the reliability and durability of the clamping device.

[0068] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. Clamping device for clamping a stationary blade (100), characterized in that include: The first cover (11) is provided with an extension (111) and a fixing part (112) connected to each other along the first direction. A positioning post (2) is provided on the extension (111). One end of the blade (100) is sleeved on the positioning post (2) through a positioning hole, and the other end extends in the first direction. A locking member (3) is movably disposed on the first cover (11). The locking member (3) has a first position and a second position. When the locking member (3) is in the first position, the locking member (3) and the extension (111) together clamp the blade (100). When the locking member (3) is in the second position, the locking member (3) is away from the extension (111), and the blade (100) can be installed or removed from the positioning post (2). An elastic element (4) is disposed on the fixing part (112). When the locking element (3) is in the second position, the elastic element (4) is squeezed, so that the elastic element (4) can drive the locking element (3) to move from the second position to the first position.

2. The clamping device of claim 1, wherein The locking member (3) includes a first driving block (31), a first connecting post (32), and a first pressure plate (33) connected in sequence. The first cover (11) has a through hole (110) along a second direction, which is perpendicular to the first direction. The first connecting post (32) passes through the through hole (110). The first driving block (31) and the first pressure plate (33) are located on both sides of the first cover (11). When the locking member (3) is in the first position, the first pressure plate (33) presses against the surface of the blade (100). When the first driving block (31) is moved away from the extension, the first connecting post (32) can slide in the through hole (110) so that the first pressure plate (33) separates from the blade (100).

3. The clamping device of claim 2, wherein The first cover (11) is provided with a first limiting groove (1100), the through hole (110) is connected to the bottom of the first limiting groove (1100), the elastic element (4) is disposed in the first limiting groove (1100), and the first driving block (31) is located in the first limiting groove (1100) and can move in the first limiting groove (1100) to squeeze or release the elastic element (4).

4. The clamping device of claim 3, wherein The clamping device further includes a cover plate (5) with a groove (50), which is fitted into the first limiting groove (1100) so that the groove (50) and the first limiting groove (1100) communicate to form a sliding channel, and the first driving block (31) can slide along the sliding channel to squeeze or release the elastic element (4).

5. The clamping device of claim 3, wherein The elastic element (4) includes two elastic arms (41) arranged at an angle. When the locking element (3) is in the first position, one of the elastic arms (41) abuts against the first driving block (31), and the other elastic arm (41) abuts against the inner wall of the first limiting groove (1100).

6. The clamping device of claim 1, wherein The locking member (3) includes a second driving block (34), a second connecting post (35), and a second pressure plate (36) connected in sequence. The second connecting post (35) passes through and is rotatably connected to the fixing part (112) along a second direction, which is perpendicular to the first direction. The second driving block (34) and the second pressure plate (36) are located on both sides of the fixing part (112). When the locking member (3) is in the first position, the second pressure plate (36) presses against the surface of the blade (100), and the second driving block (34) moves away from the extension. The second connecting post (35) rotates synchronously, causing the second pressure plate (36) to rotate and separate from the blade (100).

7. The clamping device of claim 6, wherein The first cover (11) is provided with a second limiting groove (1110), the elastic element (4) is disposed in the second limiting groove (1110), and the second driving block (34) is located in the second limiting groove (1110) and can rotate in the second limiting groove (1110) to squeeze or release the elastic element (4).

8. The clamping device of claim 7, wherein The elastic element (4) is a spring sheet. One end of the elastic element (4) is fixedly connected to the inner wall of the second limiting groove (1110). When the locking element (3) is in the first position, the second driving block (34) is sandwiched between one inner wall of the second limiting groove (1110) and the elastic element (4).

9. A utility knife characterized by, The device includes a second cover (12), a push button (6), a blade shell, the blade (100), and a clamping device as described in any one of claims 1-8. The blade shell has a receiving cavity and a groove and an opening communicating with the receiving cavity. The clamping device is located in the receiving cavity. One end of the blade (100) is fixed to the clamping device, and the other end extends toward the opening. The second cover (12) and the first cover (11) are fastened together to form a base (1). The push button (6) is connected to the second cover (12) and extends out of the receiving cavity through the groove. The push button (6) can slide along the groove to push the base (1) to move in the receiving cavity and drive the blade (100) to extend out of or retract from the receiving cavity through the opening.

10. The utility knife of claim 9, wherein, The cavity is provided with a knife holder with meshing teeth. A leaf spring (7) is provided between the second cover (12) and the first cover (11). The leaf spring (7) can engage or disengage with the meshing teeth during movement.

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