Art knife

Abstract

The invention discloses an art knife which comprises a shell assembly provided with a containing cavity, a knife outlet port and a mounting port. The cutter box assembly is suitable for being taken out from the mounting port; the knife holder assembly is suitable for moving in the length direction of the art knife, so that the blade extends out of the knife outlet port; the tool apron assembly is provided with a matching surface; the locking assembly can move between a locking position and an unlocking position, when the locking assembly is located at the locking position, the locking assembly is connected with the knife box assembly in an embedded mode, and when the locking assembly is located at the unlocking position, the locking assembly is separated from the knife box assembly; the tool changing assembly can move between a first position and a second position, and the tool changing assembly is provided with a tool changing face; when the tool changing assembly is located at the first position, the tool apron assembly moves between the initial position and the working position, and when the tool changing assembly is located at the second position, the tool apron assembly can continue to move from the working position to the tool outlet port to the tool changing position, so that the blade is completely exposed.

Description

Technical Field

[0001] This invention relates to the field of cutting tool technology, specifically, to a utility knife. Background Technology

[0002] Utility knives are commonly used tools in construction, decoration, logistics, and everyday handicrafts. Utility knives in this technology typically come with only one blade. Although some utility knives have a compartment on the blade body for storing spare blades, this compartment can easily detach during use, raising safety concerns. Furthermore, when changing blades, the connection between the blade and the blade holder is usually inside the blade case, making it difficult for users to visually determine if the blade is properly installed. If debris, adhesive residue, or other impurities accumulate inside the blade case or holder, it can not only affect the accurate installation and securing of the new blade but may also cause jamming, affecting the normal use of the utility knife. Summary of the Invention

[0003] The purpose of this invention is to provide a utility knife that solves or at least partially alleviates at least one of the defects in the aforementioned background art.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a utility knife, comprising: a shell assembly, the shell assembly having a receiving cavity, a blade extension port, and a mounting port, the blade extension port being located at the front end of the shell assembly; a blade holder assembly, the blade holder assembly being installed within the receiving cavity for accommodating multiple blades, the blade holder assembly being adapted to be removed from the mounting port; a blade holder assembly, the blade holder assembly being installed within the receiving cavity for carrying the blades, the blade holder assembly being adapted to move along the length direction of the utility knife, causing the blades to extend from the blade extension port; the blade holder assembly having a mating surface; and a locking assembly, the locking assembly being movable between a locked position and an unlocked position, the locking assembly being engaged with the blade holder assembly when in the locked position. The blade holder assembly is held within the receiving cavity. When the locking assembly is in the unlocked position, the locking assembly separates from the blade holder assembly, allowing the blade holder assembly to be removed from the mounting port. The blade changing assembly is movable between a first position and a second position, and has a blade changing surface. When the blade changing assembly is in the first position, the blade changing surface and the mating surface of the blade holder assembly are spaced apart and opposite to each other along the length of the utility knife, allowing the blade holder assembly to move between an initial position and a working position. When the blade changing assembly is in the second position, the blade changing surface and the mating surface are misaligned along the length of the utility knife, allowing the blade holder assembly to continue moving from the working position to the blade changing position, fully exposing the blade.

[0005] As a preferred embodiment, the blade holder assembly and the blade box assembly are stacked along the thickness direction of the utility knife, and the blade holder assembly is able to engage a blade from the blade box assembly and carry the blade to extend from the blade outlet port.

[0006] Preferably, the knife box assembly has a fitting groove; the locking assembly includes a stop block and a first reset member, the stop block includes a connecting portion and a fitting portion, the connecting portion is used to slide with the housing assembly, so that the stop block can move between a locked position and an unlocked position, the fitting portion extends from the connecting portion to the knife box assembly, and can be separably fitted with the fitting groove; the first reset member is connected between the stop block and the housing assembly, so as to provide a force to the stop block to move toward the locked position.

[0007] As a preferred embodiment, the blade holder assembly includes a blade holder body, a pressing member, and a second resetting member. The blade holder body carries the blade, the pressing member is hinged to the blade holder body, and the second resetting member is connected between the pressing member and the blade holder body, providing a rotational force to the pressing member away from the blade. The locking assembly also includes a rotatable rotating plate movably connected to the stop block, which drives the rotating plate to rotate. When the stop block is in the unlocked position and the blade holder assembly is in the initial position, one end of the rotating plate abuts against the pressing member, causing the pressing member to push the blade towards the blade holder assembly.

[0008] As a preferred embodiment, when the tool holder assembly is in the working position, one end of the rotating plate is adapted to abut against the tool holder body, so that the stop block remains engaged with the fitting groove of the tool box assembly.

[0009] As a preferred embodiment, the utility knife further includes a pop-out component located between the housing assembly and the knife case assembly. The pop-out component is adapted to abut against the knife case assembly to provide a force to the knife case assembly to move toward the mounting port.

[0010] As a preferred embodiment, the blade holder assembly includes a blade holder body for carrying a blade. The blade holder body has a mating protrusion on its side facing the blade changing assembly, and the mating surface is located on the mating protrusion. The blade changing assembly includes a first slider. The first slider has a blade changing protrusion on its side facing the blade holder body, and the blade changing surface is located on the blade changing protrusion. The first slider is adapted to move between a first position and a second position, such that the blade changing protrusion and the mating protrusion on the blade holder body are spaced apart and opposite to each other along the length direction of the utility knife, or are offset along the length direction of the utility knife.

[0011] As a preferred embodiment, the blade changing assembly further includes a second slider, the first slider having a first retaining structure on the side facing the second slider, and the second slider having a second retaining structure on the side facing the first slider. The first retaining structure and the second retaining structure are adapted to engage with each other so that the blade changing protrusion and the mating protrusion are kept misaligned in the length direction of the utility knife.

[0012] As a preferred embodiment, the blade changing assembly further includes a third reset member and a fourth reset member. The third reset member is connected between the first slider and the housing assembly, providing a force to the first slider to move toward a first position, so that the blade changing protrusion and the mating protrusion remain oppositely positioned along the length of the utility knife. The fourth reset member is connected between the second slider and the housing assembly, providing a force to the second slider to move toward a second position, so that the first retaining structure and the second retaining structure remain engaged.

[0013] As a preferred embodiment, the blade box assembly includes a main blade box and a top plate. The main blade box has a placement slot for accommodating multiple blades. The top plate is elastically deformable and is disposed within the placement slot on the side wall facing the blade holder assembly, thereby providing a force to the blades to move toward the blade holder assembly. The blade holder assembly includes a blade holder body with a mating groove for accommodating a blade. The blade holder body also includes a first mating portion protruding from the mating groove towards the side wall of the main blade holder, extending into the placement slot and engaging with a notch in a blade. The blade holder assembly further includes a mounting strip protruding from the mating groove towards the side wall of the main blade holder, extending into an opening in the placement slot for a blade. A blade changing groove is formed on the side of the blade changing assembly facing the blade changing assembly, extending along the length of the utility knife, with one wall forming a reset wall. A sliding post protruding from the side of the second slider of the blade changing assembly facing the blade holder body is provided, adapted to move within the blade changing groove, the sliding post and the reset wall extending along the length of the utility knife. The blade holder assembly is arranged at intervals relative to each other in the 10-degree direction. When the blade holder assembly moves to the blade changing position, it abuts against the sliding column through the reset wall, thereby pushing the second slider to move to the first position, so that the first holding structure and the second holding structure disengage. The blade changing assembly also includes a support plate mounted on the housing assembly. The support plate includes a first support portion, which is spaced apart from the housing assembly to form an installation space between the first support portion and the housing assembly. The blade changing assembly is accommodated in the installation space. The support plate also includes a second support portion connected to the first support portion, which is spaced apart from the first support portion. A limiting groove is formed between the second support portion and the first support portion, and / or between the second support portion and the housing assembly. The limiting groove extends along the length direction of the utility knife, and a portion of the blade holder assembly is accommodated in the limiting groove.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The locking component keeps the knife box assembly inside the receiving cavity, which helps to prevent the knife box assembly from falling out during the use of the utility knife and improves the safety of the utility knife; (2) The tool holder assembly can be moved between the initial position and the working position by means of the tool changing assembly, and when the blade needs to be changed, the tool holder assembly can be moved to the tool changing position so that the blade is fully exposed, thereby improving the convenience of changing the blade. Attached Figure Description

[0015] Figure 1 This is an exploded view of a utility knife according to some embodiments of this application.

[0016] Figure 2 This is an internal structural diagram of a utility knife according to some embodiments of this application.

[0017] Figure 3This is a schematic diagram of a locking assembly and a tool changing assembly installed on a second tool housing according to some embodiments of this application.

[0018] Figure 4A This is a schematic diagram of a stop block according to some embodiments of this application.

[0019] Figure 4B This is a schematic diagram of a stop block according to some other embodiments of this application.

[0020] Figure 5A This is a schematic diagram of a rotating plate according to some embodiments of this application.

[0021] Figure 5B This is a schematic diagram of a rotating plate according to some other embodiments of this application.

[0022] Figure 6A This is a schematic diagram of a utility knife according to some embodiments of this application with the locking component in the locking position.

[0023] Figure 6B This is a schematic diagram of a utility knife according to other embodiments of this application with the locking component in the locking position.

[0024] Figure 6C This is a schematic diagram of a utility knife according to some embodiments of this application, in the state where the rotating plate abuts against the main body of the knife holder.

[0025] Figure 7 This is a cross-sectional view of a utility knife according to some embodiments of this application with the locking component in the locking position.

[0026] Figure 8 This is an enlarged view of point A in section 7.

[0027] Figure 9 This is a cross-sectional view of a utility knife according to some embodiments of this application with the locking component in the locking position.

[0028] Figure 10 This is an enlarged view of point B in number 9.

[0029] Figure 11 This is a schematic diagram of a utility knife according to some embodiments of this application with the locking component in the unlocked position.

[0030] Figure 12 This is a cross-sectional view of a utility knife according to some embodiments of this application with the locking component in the unlocked position.

[0031] Figure 13 This is a magnified view of point C in section 12.

[0032] Figure 14 This is a cross-sectional view of a utility knife according to some embodiments of this application with the locking component in the unlocked position.

[0033] Figure 15 This is an enlarged view of point D in section 14.

[0034] Figure 16 This is a schematic diagram showing the open state of the secondary blade box of a utility knife according to some embodiments of this application.

[0035] Figure 17 This is a schematic diagram of the utility knife's secondary blade box in the closed state according to some embodiments of this application.

[0036] Figure 18 This is an exploded view of the blade holder assembly and drive assembly of a utility knife according to some embodiments of this application.

[0037] Figure 19 This is a perspective view of the blade holder body of a utility knife according to some embodiments of this application.

[0038] Figure 20 This is a cross-sectional view of a utility knife according to some embodiments of this application.

[0039] Figure 21 This is a schematic diagram of a tool changing assembly according to some embodiments of this application.

[0040] Figure 22 This is a perspective view of a utility knife according to some embodiments of this application, with the knife holder assembly in its initial position.

[0041] Figure 23 This is a schematic diagram of the engagement of the knife holder body and the knife changing assembly of a utility knife according to some embodiments of this application when the knife holder assembly is in the initial position.

[0042] Figure 24 This is a perspective view of a utility knife according to some embodiments of this application, showing the knife holder assembly in the working position.

[0043] Figure 25 This is a schematic diagram of the engagement of the knife holder body and the knife changing assembly of a utility knife according to some embodiments of this application when the knife holder assembly is in the working position.

[0044] Figure 26 This is a perspective view of a utility knife according to some embodiments of this application, showing the knife holder assembly in the knife changing position.

[0045] Figure 27 This is a schematic diagram of a utility knife according to some embodiments of this application when the blade changing assembly is in the second position.

[0046] Figure 28 This is a schematic diagram of the cooperation between the knife holder body and the knife changing assembly of a utility knife according to some embodiments of this application when the knife holder assembly is in the knife changing position.

[0047] Figure 29 This is a schematic diagram of the cooperation between the knife holder body and the knife changing assembly during the process of the knife holder assembly returning from the knife changing position to the initial position in some embodiments of this application.

[0048] Figure 30 This is a schematic diagram of a support plate according to some embodiments of this application.

[0049] Figure 31 This is a perspective view of a utility knife according to some embodiments of this application, showing the knife holder assembly in a transitional position.

[0050] In the diagram: 1. Utility knife; 10. Outer shell assembly; 11. First blade shell; 12. Second blade shell; 121. Protrusion; 122. Slide rail; 123. Groove; 13. Receiving cavity; 14. Blade outlet port; 15. Mounting port; 16. Rubber pad; 20. Blade box assembly; 21. Main blade box; 211. Placement slot; 212. Blade outlet; 213. First side wall; 2131. Positioning post; 214. Top plate; 215. Second side wall; 216. Third side wall; 217. Bottom wall; 2171. Metal plate; 218. Fitting groove; 219. Guide surface; 22. Secondary tool box; 30. Tool holder assembly; 31. Tool holder body; 311. Mating protrusion; 3111. Mating surface; 3112. Second guide surface; 312. Base; 3121. Slide groove; 313. Sliding part; 314. Engaging groove; 315. First engagement part; 316. Second engagement part; 3161. Inclined surface; 317. Tool changing groove; 3171. Reset wall; 318. Mounting strip; 32. Pressing element; 33. Second reset 34. Positioning component; 40. Magnetic suction component; 41. Locking assembly; 41. Stop block; 411. Connecting part; 4111. Through hole; 4112. Guide groove; 412. Fitting part; 413. Stop part; 42. Rotating plate; 421. Upper section; 422. Middle section; 423. Hinge section; 424. Lower section; 4241. Guide post; 43. First reset component; 50. Tool changing assembly; 51. First slider; 511. Tool changing protrusion; 5111. Tool changing surface; 5112. First guide surface; 512. 52. First retaining structure; 53. Third reset component; 54. Second slider; 55. Second retaining structure; 56. Sliding column; 57. Fourth reset component; 68. Support plate; 69. First support part; 60. Clearance hole; 612. Installation space; 62. Second support part; 621. Limiting groove; 70. Pop-out assembly; 71. Fixing component; 72. Moving component; 73. Elastic component; 80. Drive assembly; 81. Spring; 82. Drive button; 90. Blade; 91. Notch; 92. Opening. Detailed Implementation

[0051] The present invention will now be further described in conjunction with specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0052] In the description of this invention, it should be noted that directional terms such as "center," "lateral," "longitudinal," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this invention.

[0053] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0054] A utility knife 1, such as Figures 1-31 As shown, the assembly includes: a housing assembly 10, a blade holder assembly 20, a blade holder assembly 30, a locking assembly 40, and a blade changing assembly 50. Specifically, the housing assembly 10 has a receiving cavity 13, a blade delivery port 14, and a mounting port 15. The blade holder assembly 20 is installed within the receiving cavity 13 to house multiple blades 90, and is adapted to be removed from the mounting port 15. The blade holder assembly 30 is installed within the receiving cavity 13 to carry the blades 90 and to expose the blades 90 from the receiving port 14 within the housing assembly 10.

[0055] As shown in Figure 6- Figure 15 As shown, the locking component 40 can move between a locked position and an unlocked position. When the locking component 40 is in the locked position, it engages with the knife holder assembly 20, keeping the knife holder assembly 20 within the receiving cavity 13. This helps prevent the knife holder assembly 20 from coming out during use of the utility knife 1, improving the safety of the utility knife 1. When the locking component 40 is in the unlocked position, it separates from the knife holder assembly 20, allowing the knife holder assembly 20 to be removed from the mounting port 15. This facilitates the removal of the blade 90 from the knife holder assembly 20 or the loading of a new blade 90 into the knife holder assembly 20.

[0056] like Figures 21-29 As shown, the tool changing assembly 50 is movable between a first position and a second position, and the tool changing assembly 50 has a tool changing surface 5111. Further, the tool holder assembly 30 has a mating surface 3111. When the tool changing assembly 50 is in the first position, as... Figure 23As shown, the blade changing surface 5111 and the mating surface 3111 of the blade holder assembly 30 are arranged opposite each other at intervals along the length direction of the utility knife 1, so that the blade holder assembly 30 can move between the initial position and the working position.

[0057] In at least one embodiment, the blade outlet 14 is located at the front end of the housing assembly 10, and the blade holder assembly 30 is adapted to move along the length of the utility knife 1, allowing the blade 90 to extend from the blade outlet 14. When the blade holder assembly 30 is in its initial position, as... Figure 22 and Figure 23 As shown, the blade 90 carried by the blade holder assembly 30 is completely housed within the receiving cavity 13; at this time, the blade changing surface 5111 and the mating surface 3111 are spaced apart along the length of the utility knife 1, allowing the blade holder assembly 30 to move from the initial position to the working position. When the blade holder assembly 30 is in the working position, as... Figure 24 and Figure 25 As shown, part of the blade 90 carried by the blade holder assembly 30 protrudes from the blade outlet port 14, thus enabling cutting operations. At this time, the blade changing surface 5111 abuts against the mating surface 3111, or there is a reasonable redundant gap, so the blade changing assembly 50 can limit the blade holder assembly 30, preventing the blade holder assembly 30 from continuing to move from the working position to the blade outlet port 14, which helps to prevent the blade 90 engaged with the blade holder assembly 30 from being completely exposed.

[0058] When the tool changer assembly 50 is in the second position, such as Figure 26 and Figure 27 As shown, the blade changing surface 5111 and the mating surface 3111 are offset along the length of the utility knife 1, allowing the blade holder assembly 30 to continue moving from the working position to the blade outlet port 14 to the blade changing position, fully exposing the blade 90 or exposing most of the blade 90, thereby improving the convenience of changing the blade 90. In other words, through the cooperation of the blade changing assembly 50 and the blade holder assembly 30, when the blade 90 needs to be changed, the blade changing assembly 50 is switched to the second position, and the blade holder assembly 30 can continue to move forward to the blade changing position to perform the blade changing operation, which helps improve work efficiency.

[0059] In at least one other embodiment, the blade holder assembly 30 is adapted to rotate relative to the housing assembly 10, and the blade outlet port 14 is opened on the side of the housing assembly 10, that is, the utility knife 1 is in the form of a folding knife. When the blade holder assembly 30 and the housing assembly 10 are folded together, the blade 90 carried by the blade holder assembly 30 is completely housed in the receiving cavity 13. When the blade holder assembly 30 is rotated and unfolded relative to the housing assembly 10, the blade changing surface 5111 and the mating surface 3111 are spaced apart along the length direction of the utility knife 1 so that the exposed length of the blade 90 is adjustable; or, the blade changing surface 5111 and the mating surface 3111 abut against each other so that the blade 90 is kept at a fixed exposed length. Furthermore, when the blade changing assembly 50 is in the second position, the blade changing surface 5111 and the mating surface 3111 are offset along the length direction of the utility knife 1, so that the blade holder assembly 30 can continue to move forward from the working position to the blade changing position, so that the blade 90 is fully exposed, or most of the blade 90 is exposed, thereby improving the convenience of changing the blade 90.

[0060] The above description of the connection method between the tool holder assembly 30 and the housing assembly 10, the position of the tool outlet port 14 on the housing assembly 10, and the initial spacing or abutment of the tool changing surface 5111 and the mating surface 3111 are exemplary. Those skilled in the art can adjust the specific structure according to actual usage requirements, and such adjustments are all within the protection scope of this invention.

[0061] It should be understood that the locking component 40 and the blade changing component 50 are independent of each other and control the blade box component 20 and the blade holder component 30 respectively, thereby reducing the difficulty of using the utility knife 1 and helping users learn how to operate the utility knife 1 more quickly, thus improving the operability and interactivity of the utility knife 1.

[0062] In at least one embodiment, such as Figures 1-3 As shown, the outer casing assembly 10 includes a first blade shell 11 and a second blade shell 12 that engage with each other, forming a receiving cavity 13, a blade extension port 14, and a mounting port 15 between the first blade shell 11 and the second blade shell 12. Furthermore, the outer casing assembly 10 also includes a rubber pad 16, which covers at least a portion of the outer surface of the first blade shell 11 and the second blade shell 12, thereby improving the grip of the utility knife 1 and providing an anti-slip function.

[0063] In some embodiments, such as Figure 1 and Figure 2As shown, the blade holder assembly 30 and the blade box assembly 20 are stacked along the thickness direction of the utility knife 1. The blade holder assembly 30 can engage a blade 90 from the blade box assembly 20 and carry the blade 90 out of the blade outlet port 14. It should be understood that the blade box assembly 20 can accommodate multiple blades 90. The blade holder assembly 30 can engage with the blade 90 closest to the blade holder assembly 30 within the blade box assembly 20 and carry the blade 90 out of the blade outlet port 14 to perform cutting operations. When it is necessary to replace the blade 90, the old blade 90 is removed from the blade holder assembly 30, and the blade holder assembly 30 can then engage with the new blade 90 closest to the blade holder assembly 30 within the blade box assembly 20, thereby achieving quick and convenient replacement of the blade 90.

[0064] In other words, the user only needs to remove the old blade 90 without manually installing the new blade 90; the blade holder assembly 30 can actively engage with the new blade 90 closest to the blade holder assembly 30 in the blade box assembly 20, thereby completing the installation of the new blade 90 until all the blades 90 in the blade box assembly 20 have been removed.

[0065] It is worth mentioning that this design not only improves the efficiency and convenience of changing the blade 90, but also facilitates one-handed blade replacement. Specifically, after the blade holder assembly 30 carries the old blade 90 and fully exposes it from the blade outlet 14, the user can use gravity or by prying it with the edge of a table to separate the old blade 90 from the blade holder assembly 30. When the blade holder assembly 30 moves into the receiving cavity 13, it actively engages with the new blade 90, completing the blade replacement. The entire blade replacement process only requires one-handed operation of the utility knife 1, allowing the user's other hand to remain in a supporting position for the object to be cut.

[0066] In some embodiments, such as Figure 16 and Figure 17 As shown, the knife case assembly 20 has a fitting groove 218; the locking assembly 40 includes a stop block 41, which includes a connecting portion 411 and a fitting portion 412. The connecting portion 411 is slidably connected to the outer casing assembly 10, allowing the stop block 41 to move along the utility knife 1 between a locked position and an unlocked position. The fitting portion 412 extends from the connecting portion 411 toward the knife case assembly 20, and can be separably engaged with the fitting groove 218. Specifically, when the stop block 41 is in the locked position, the fitting portion 412 engages with the fitting groove 218 to keep the knife case assembly 20 in the receiving cavity 13; when the stop block 41 is pressed to the unlocked position by the user, the fitting portion 412 separates from the fitting groove 218, allowing the knife case assembly 20 to be removed from the mounting port 15.

[0067] It should be understood that the mounting port 15 can be located at the front end, rear end, side along the thickness direction of the utility knife 1, or side along the width direction of the utility knife 1 of the housing assembly 10. In other words, without affecting the normal movement of the knife holder assembly 30, the knife box assembly 20 can move along the length direction, thickness direction, or width direction of the utility knife 1, and thus be removed from the corresponding mounting port 15. The knife box assembly 20 can also be ejected from the corresponding mounting port 15 by rotation. This application does not impose specific limitations on this. In addition, the movement direction of the stop block 41 of the locking assembly 40 is not limited to the thickness direction of the utility knife 1. For example, when the mounting port 15 is located on the side wall of the housing assembly 10 along the thickness direction of the utility knife 1, the stop block 41 can also move between the locked position and the unlocked position along the width direction of the utility knife 1. Those skilled in the art can adjust the connection method between the knife box assembly 20 and the housing assembly 10, and correspondingly adjust the movement method of the stop block 41 according to actual usage requirements. Such adjustments are all within the protection scope of this invention.

[0068] Preferably, the mounting port 15 is located at the front or rear end of the housing assembly 10, so that the knife box assembly 20 can move along the length of the utility knife 1 and be taken out from the mounting port 15; this helps to prevent the knife holder assembly 30 from being affected, and allows the blade 90 in the knife box assembly 20 to engage more smoothly with the knife holder assembly 30.

[0069] In at least one embodiment, such as Figures 3-4B As shown, the second blade housing 12 has a protrusion 121 extending along the thickness direction of the utility knife 1, and the connecting portion 411 of the stop block 41 has a through hole 4111 suitable for cooperating with the protrusion 121. Thus, through the cooperation of the protrusion 121 and the through hole 4111, the stop block 41 can move along the thickness direction of the utility knife 1. It should be understood that the through hole 4111 can also be provided on the second blade housing 12, and the protrusion 121 can be provided on the connecting portion 411; this application does not impose specific limitations on this.

[0070] In some embodiments, such as Figures 6A-6C As shown, the locking assembly 40 also includes a first reset member 43, which is connected between the stop block 41 and the housing assembly 10. Specifically, the first reset member 43 is connected between the stop block 41 and the second tool housing 12, so as to provide a force to the stop block 41 to move toward the locking position, so that the stop block 41 is held in the locking position, and the tool holder assembly 30 can move between the initial position and the working position.

[0071] In some embodiments, such as Figure 18As shown, the tool holder assembly 30 includes a tool holder body 31, a pressing member 32, and a second resetting member 33. Specifically, the tool holder body 31 is used to carry the cutting blade 90, the pressing member 32 is hinged to the tool holder body 31, and the second resetting member 33 is connected between the pressing member 32 and the tool holder body 31, so as to provide a rotational force to the pressing member 32 in a direction away from the cutting blade 90, thereby separating the pressing member 32 from the cutting blade 90 engaged on the tool holder body 31.

[0072] Furthermore, such as Figures 6A-15 As shown, the locking assembly 40 also includes a rotatable rotating plate 42, which is movably connected to the stop block 41, allowing the stop block 41 to drive the rotating plate 42 to rotate. Figure 6A , Figure 6B , Figures 7-15 As shown, when the stop block 41 is in the unlocked position and the blade holder assembly 30 is in the initial position, one end of the rotating plate 42 abuts against the pressing member 32, which can overcome the force of the second reset member 33, so that the pressing member 32 pushes the blade 90 to move towards the blade box assembly 20, and then the blade 90 can separate from the blade holder body 31. In this way, all the blades 90 in the blade box assembly 20 can be taken out from the receiving cavity 13 along with the blade box assembly 20, which helps to avoid leaving a blade 90 that is engaged with the blade holder body 31 in the receiving cavity 13.

[0073] In at least one embodiment, the rotating plate 42 is hinged to the housing assembly 10 to simplify the assembly of the utility knife 1. Those skilled in the art can adjust the mounting method of the rotating plate 42 according to actual usage needs, and such adjustments are all within the scope of protection of this invention.

[0074] It is worth mentioning that if a blade 90 engaged with the blade holder body 31 is left in the receiving cavity 13, after the blade box assembly 20 is removed, this blade 90 may separate from the blade holder body 31 and fall off, causing it to jam with other structures inside the utility knife 1. This could make it difficult for the blade box assembly 20 to be reinserted into the receiving cavity 13, or render the utility knife 1 unusable. In this embodiment, through the linkage between the stop block 41, the rotating plate 42, and the pressing member 32, all blades 90 inside the utility knife 1 can be removed along with the blade box assembly 20, thereby ensuring that the blade box assembly 20 can be smoothly reinserted into the receiving cavity 13 and that the utility knife 1 can be used normally.

[0075] In some embodiments, such as Figure 6C As shown, when the knife holder assembly 30 is in the working position, one end of the rotating plate 42 is adapted to abut against the knife holder body 31, which helps to prevent the stop block 41 from moving to the unlocked position due to accidental contact, thereby ensuring that the stop block 41 and the fitting groove 218 of the knife box assembly 20 are reliably engaged, which can ensure that the knife box assembly 20 is kept in the receiving cavity 13 and improve the safety of the utility knife 1.

[0076] In some embodiments, such as Figure 5A and Figure 5B As shown, the rotating plate 42 includes an upper section 421, a middle section 422, a hinge section 423, and a lower section 424. Specifically, the upper section 421 is adapted to abut against the tool holder body 31 or the pressing member 32; the middle section 422 is connected between the upper section 421 and the lower section 424; the hinge section 423 is connected to the opposite sides of the middle section 422, and the rotating plate 42 is hinged to the housing assembly 10 through the hinge section 423; the lower section 424 extends toward the stop block 41 and is adapted to be movably connected to the stop block 41, so that the rotating plate 42 can rotate relative to the housing assembly 10 under the drive of the stop block 41.

[0077] This should be understandable, such as Figures 11-15 As shown, through the cooperation between the lower section 424 of the rotating plate 42 and the stop block 41, when the stop block 41 moves from the locked position to the unlocked position, it can drive the rotating plate 42 to rotate. Then, the upper section 421 of the rotating plate 42 abuts against the pressing member 32, which can overcome the force of the second reset member 33, so that the pressing member 32 pushes the blade 90 to move towards the blade box assembly 20.

[0078] It is worth mentioning that there is an appropriate distance between the contact position between the upper section 421 and the rotating plate 42 and the hinge section 423, so that the stop block 41 can drive the rotating plate 42 to rotate more smoothly, thereby improving the working reliability and interactivity of the utility knife 1.

[0079] In at least one embodiment, the upper section 421, middle section 422, hinge section 423, and lower section 424 of the rotating plate 42 are integrally formed, thereby reducing the number of parts in the utility knife 1, lowering production costs, and simplifying the assembly process of the utility knife 1, thus improving production efficiency. In at least one other embodiment, the upper section 421, middle section 422, and lower section 424 of the rotating plate 42 are integrally formed, while the hinge section 423 is manufactured separately and then installed on the middle section 422. This is beneficial for improving the wear resistance and structural strength of the hinge section 423 individually; for example, the hinge section 423 can be made of metal.

[0080] In at least one embodiment, such as Figures 4A-5B As shown, the rotating plate 42 includes two lower sections 424 spaced apart along the length of the utility knife 1. The fitting portion 412 of the stop block 41 is located between the two lower sections 424, which makes the internal structure of the utility knife 1 more compact and reduces the overall size of the utility knife 1. Furthermore, two connecting portions 411 extend from opposite sides of the fitting portion 412 away from each other, and the two connecting portions 411 abut against the two lower sections 424 one by one. It should be understood that this arrangement makes the force on the stop block 41 and the rotating plate 42 more balanced, which is beneficial to improving the structural reliability of the locking assembly 40 and the operability of the utility knife 1.

[0081] In some embodiments, such as Figure 4A and Figure 5A As shown, the connecting part 411 of the stop block 41 has one of a guide groove 4112 or a guide post 4241, and the lower section 424 of the rotating plate 42 has the other of a guide groove 4112 or a guide post 4241; the guide post 4241 extends into the guide groove 4112; when the stop block 41 moves along the thickness direction of the utility knife 1, the rotating plate 42 is driven to rotate through the sliding fit of the guide post 4241 and the guide groove 4112, thereby improving the reliability of the fit between the stop block 41 and the rotating plate 42.

[0082] In other embodiments, such as Figure 4B and Figure 5B As shown, the lower section 424 of the rotating plate 42 and the stop block 41 are movably connected by abutting each other, which helps to reduce the assembly difficulty between the rotating plate 42 and the stop block 41, thereby improving the production efficiency of the utility knife 1. Furthermore, the stop block 41 also includes a stop part 413, which is connected to the fitting part 412 and extends from the fitting part 412 toward the middle section 422 of the rotating plate 42, so as to overlap with the middle section 422 along the thickness direction of the utility knife 1; when the stop block 41 moves toward the locking position, the stop block 41 can drive the rotating plate 42 to rotate, so that the upper section 421 moves away from the knife holder body 31.

[0083] In other words, such as Figures 6A-10 As shown, when the stop block 41 moves toward the locked position under the action of the first reset member 43, the rotating plate 42 can be rotated by the cooperation of the stop part 413 and the middle section 422 of the rotating plate 42, thereby reducing or even eliminating the force of the upper section 421 of the rotating plate 42 on the pressing member 32. The pressing member 32 can rotate away from the blade 90 under the action of the second reset member 33, so that the pressing member 32 is separated from the blade 90 engaged on the blade holder body 31. In this way, when the stop block 41 is in the locked position, the blade 90 can reliably engage with the blade holder body 31.

[0084] In some embodiments, such as Figure 6A As shown, the utility knife 1 also includes a pop-out component 70, which is located between the outer shell component 10 and the knife box component 20. The pop-out component 70 is adapted to abut against the knife box component 20 to provide a force to the knife box component 20 to move toward the mounting port 15, thereby making it easier for the user to remove the knife box component 20 with less effort and convenience, and facilitating the removal of the knife box component 20 with one hand.

[0085] In some embodiments, such as Figure 6AAs shown, the pop-out component 70 includes a fixing member 71, a movable member 72, and an elastic member 73. The fixing member 71 is fixedly disposed on the outer shell component 10. Specifically, the fixing member 71 is disposed on the first blade shell 11. The movable member 72 is connected to the fixing member 71 and can move relative to the fixing member 71 along the length direction of the utility knife 1. The movable member 72 abuts against the blade box assembly 20 along the length direction of the utility knife 1. The elastic member 73 is connected between the fixing member 71 and the movable member 72 and can provide a force to the movable member 72 and the blade box assembly 20 to move toward the mounting port 15.

[0086] In some embodiments, such as Figure 16 and Figure 17 As shown, the blade holder assembly 20 includes a main blade holder 21 and a top plate 214. The main blade holder 21 has a placement slot 211 for accommodating multiple blades 90, thereby increasing the storage capacity of the utility knife 1 and enabling multiple quick blade replacements. Furthermore, the top plate 214 is elastically deformable and is disposed within the placement slot 211 on the side wall facing the blade holder assembly 30, thereby providing a force to the blades 90 to move towards the blade holder assembly 30, so that the blade 90 closest to the blade holder body 31 can engage with the blade holder body 31.

[0087] In some embodiments, such as Figure 16 and Figure 17 As shown, the knife box assembly 20 also includes a secondary knife box 22, which is movably mounted on the main knife box 21. The secondary knife box 22 is used to accommodate multiple blades 90, further increasing the storage capacity of the utility knife 1. In at least one embodiment, the secondary knife box 22 is rotatably mounted on the main knife box 21. Specifically, when the secondary knife box 22 is rotated to overlap with the main knife box 21, the secondary knife box 22 and the placement slot 211 are arranged on the main knife box 21 along the length direction of the utility knife 1, thereby reducing the size of the knife box assembly 20 along the thickness direction of the utility knife 1; when the secondary knife box 22 is rotated away from the main knife box 21, it is convenient to remove the blades 90 from the secondary knife box 22.

[0088] In some embodiments, such as Figure 19 As shown, the tool holder assembly 30 also includes a first engaging portion 315. Specifically, the tool holder body 31 has an engaging groove 314 for accommodating a blade 90; the first engaging portion 315 protrudes from the engaging groove 314 toward the side wall of the main tool box 21, and the first engaging portion 315 extends into the placement groove 211 and engages with the notch 91 of a blade 90, thereby enabling the tool holder body 31 to push a blade 90 relative to the main tool box 21 within the placement groove 211.

[0089] It should be understood that when the blade holder assembly 30 is in the blade changing position, the first engagement portion 315 is exposed in the housing assembly 10, so that the user can easily remove the blade 90 or install a new blade 90 by manual installation, and can intuitively judge whether the blade 90 and the first engagement portion 315 are installed in place; in addition, it is also convenient for the user to clean the debris or glue residue in the engagement groove 314, thereby extending the service life of the utility knife 1.

[0090] In some embodiments, such as Figure 19 and Figure 26 As shown, the tool holder assembly 30 also includes a mounting strip 318, which protrudes from the side wall of the engagement groove 314 toward the main tool box 21. The mounting strip 318 extends into the opening 92 of a blade 90 in the placement groove 211, thereby improving the installation reliability of the blade 90 on the tool holder body 31 and making the blade 90 more stable during the cutting process.

[0091] In some embodiments, such as Figure 19 As shown, the blade holder body 31 also includes a second joint portion 316. The second joint portion 316 is formed on the side wall of the joint groove 314 near the mounting port 15. The second joint portion 316 and the side of the blade 90 are arranged opposite to each other along the length direction of the utility knife 1. The second joint portion 316 is provided with a bevel 3161. The bevel 3161 and the main blade box 21 are arranged opposite to each other along the thickness direction of the utility knife 1. When the main blade box 21 moves toward the mounting port 15, the bevel 3161 can guide the blade 90 to move into the joint groove 314, which helps to avoid interference between the blade 90 and the blade holder body 31.

[0092] In some embodiments, such as Figure 19 As shown, the tool holder assembly 30 also includes a magnetic attractor 34, which is embedded in the engagement groove 314 facing the side wall of the main tool box 21. The magnetic attractor 34 can attract the blade 90, thereby further improving the installation stability of the blade 90 on the tool holder body 31.

[0093] In some embodiments, such as Figure 16 and Figure 17As shown, the main blade box 21 includes a first side wall 213, a second side wall 215, a third side wall 216, and a bottom wall 217. The first side wall 213 and the second side wall 215 are arranged opposite each other along the thickness direction of the utility knife 1. The bottom wall 217 connects the first side wall 213 and the second side wall 215. A placement groove 211 is formed between the first side wall 213, the bottom wall 217, and the second side wall 215 to accommodate multiple blades 90. Furthermore, one blade 90 that is engaged with the blade holder body 31 moves along the length direction of the utility knife 1 within the placement groove 211. The third sidewall 216 is connected to the first sidewall 213 on the side near the blade outlet port 14. A blade outlet 212 is formed between the third sidewall 216 and the second sidewall 215, allowing one blade 90 to pass through. In other words, only one blade 90 that engages with the blade holder body 31 can pass through the blade outlet 212 and protrude from the blade outlet port 14 into the housing assembly 10, while the remaining blades 90 are held in the placement groove 211 by the stop action of the third sidewall 216. This helps to prevent multiple blades 90 from protruding from the blade outlet port 14.

[0094] Furthermore, such as Figure 16 and Figure 17 As shown, the fitting groove 218 is formed on the bottom wall 217. Specifically, the fitting groove 218 is formed below the bottom wall 217, that is, on the side of the bottom wall 217 away from the placement groove 211; the stop block 41 is located below the bottom wall 217, that is, the stop block 41 and the main blade box 21 are arranged opposite to each other along the width direction of the utility knife 1, and the fitting part 412 extends into the fitting groove 218, so as to be separably fitted with the fitting groove 218. It should be understood that this arrangement can make the internal structure of the utility knife 1 more compact.

[0095] Furthermore, such as Figure 16 and Figure 17 As shown, the main blade box 21 also has an inclined guide surface 219, which is located at the front end of the bottom wall 217. That is, the guide surface 219 and the fitting groove 218 are arranged along the length direction of the utility knife 1, and the guide surface 219 is set closer to the blade outlet port 14 than the fitting groove 218. The guide surface 219 and the stop block 41 are arranged opposite each other along the thickness direction of the utility knife 1. When the blade box assembly 20 is inserted into the receiving cavity 13 from the mounting port 15, the guide surface 219 pushes the stop block 41 from the locked position to the unlocked position until the stop block 41 and the fitting groove 218 are arranged opposite each other along the thickness direction of the utility knife 1. Then, under the action of the first reset member 43, the stop block 41 returns to the locked position to engage with the fitting groove 218.

[0096] In at least one embodiment, such as Figure 17As shown, a metal plate 2171 is provided on the bottom wall 217, which can reduce the damage to the bottom wall 217 caused by the blade 90 when it moves along the thickness or length direction of the utility knife 1, and extend the service life of the utility knife 1.

[0097] In at least one embodiment, such as Figure 16 and Figure 17 As shown, a positioning post 2131 is provided on the first sidewall 213. The positioning post 2131 extends along the thickness direction of the utility knife 1 and can be engaged with the notches 91 of multiple blades 90, thereby keeping the blades 90 in the placement groove 211. Furthermore, the positioning post 2131 can guide the movement of the blades 90 along the thickness direction of the utility knife 1, so that the blades 90 can smoothly engage with the first joint 315 on the blade holder body 31, thereby realizing reliable replacement of the blades 90.

[0098] Furthermore, when the pressing member 32 rotates under the influence of the rotating plate 42, causing the blade 90, which was originally engaged with the blade holder body 31, to move toward the blade box assembly 20, the notches 91 of all the blades 90 in the placement slot 211 engage with the positioning post 2131, so that all the blades 90 can be removed from the receiving cavity 13 along with the blade box assembly 20.

[0099] In some embodiments, such as Figure 19 and Figure 20 As shown, the knife holder body 31 includes a base 312 and a sliding portion 313. The base 312 and the second sidewall 215 are stacked along the thickness direction of the utility knife 1. The sliding portion 313 protrudes from the base 312 toward the main knife box 21. The sliding portion 313 and the second sidewall 215 are stacked along the width direction of the utility knife 1 and are positioned opposite to the first sidewall 213 along the thickness direction of the utility knife 1, allowing the knife holder body 31 to move relative to the main knife box 21. It should be understood that through the cooperation of the base 312, the sliding portion 313, and the second sidewall 215 of the main knife box 21, the knife holder body 31 can move relative to the main knife box 21 along the length direction of the utility knife 1, and the main knife box 21 can move relative to the knife holder body 31 along the length direction of the utility knife 1; in other words, the knife holder body 31 and the main knife box 21 can guide each other, making the structure of the utility knife 1 more compact. Furthermore, the engagement groove 314, the first engagement portion 315, and the second engagement portion 316 are located on the sliding portion 313.

[0100] In some embodiments, such as Figure 3 and Figure 18As shown, a groove 3121 is provided on the base 312 of the knife holder body 31, extending along the length of the utility knife 1; a slide rail 122 is provided protruding on the second knife shell 12, and the slide rail 122 and the groove 3121 are adapted to each other, so that the knife holder body 31 can be slidably connected to the second knife shell 12. It should be understood that after the knife box assembly 20 is removed, the knife holder body 31 can be held in the second knife shell 12 by cooperating with the second knife shell 12. This facilitates the assembly of the utility knife 1, improves the force balance of the knife holder body 31 during movement, and improves the connection reliability between the knife holder assembly 30 and the outer shell assembly 10.

[0101] In some embodiments, such as Figures 21-29 As shown, the blade holder body 31 has a mating protrusion 311 on the side facing the blade changing assembly 50, and the mating surface 3111 is located on the mating protrusion 311. The blade changing assembly 50 includes a first slider 51, and the first slider 51 has a blade changing protrusion 511 on the side facing the blade holder body 31. The blade changing surface 5111 is located on the blade changing protrusion 511. The first slider 51 is adapted to move between a first position and a second position so that the blade changing protrusion 511 and the mating protrusion 311 on the blade holder body 31 are spaced apart and opposite to each other along the length direction of the utility knife 1, or are offset along the length direction of the utility knife 1.

[0102] Specifically, when the first slider 51 is in the first position, such as Figure 23 As shown, the tool changing protrusion 511 and the mating protrusion 311 on the tool holder body 31 are spaced apart and opposite to each other along the length direction of the utility knife 1, thereby making the tool changing surface 5111 and the mating surface 3111 spaced apart and opposite to each other along the length direction of the utility knife 1, and the tool holder assembly 30 can move between the initial position and the working position. Furthermore, when the first slider 51 moves along... Figure 25 and Figure 27 When the tool changes downward to the second position, the tool changing protrusion 511 and the mating protrusion 311 are misaligned in the length direction of the utility knife 1, thereby causing the tool changing surface 5111 and the mating surface 3111 to be misaligned in the length direction of the utility knife 1. The tool holder assembly 30 can continue to move from the working position to the tool outlet port 14 to the tool changing position, so that the blade 90 is fully exposed, or most of the blade 90 is exposed.

[0103] In some embodiments, the blade changing assembly 50 further includes a third reset member 52, which is connected between the first slider 51 and the housing assembly 10. Specifically, the third reset member 52 is connected between the first slider 51 and the second blade housing 12, providing a force to the first slider 51 to move towards a first position, so that the blade changing protrusion 511 and the mating protrusion 311 remain relatively positioned along the length of the utility knife 1, thereby enabling the blade holder assembly 30 to move between the initial position and the working position. That is, when no external force drives the first slider 51 along the first position, the blade changing protrusion 511 and the mating protrusion 311 remain relatively positioned along the length of the utility knife 1, thereby enabling the blade holder assembly 30 to move between the initial position and the working position. Figure 25 and Figure 27 When the slider 51 moves downward as shown, it can be held in the first position by the action of the third reset member 52, thereby improving the safety and operability of the utility knife 1.

[0104] In some embodiments, such as Figure 29 As shown, the tool changing protrusion 511 also has a first guide surface 5112; the mating protrusion 311 also has a second guide surface 3112. The first guide surface 5112 and the second guide surface 3112 are arranged opposite to each other. When the tool holder assembly 30 moves from the tool changing position to the initial position, the tool holder assembly 30 can drive the first slider 51 to move to the second position through the cooperation of the first guide surface 5112 and the second guide surface 3112.

[0105] In other words, such as Figure 29 As shown, when the tool holder assembly 30 moves from the tool changing position to the initial position, through the cooperation of the first guide surface 5112 and the second guide surface 3112, the tool holder assembly 30 can overcome the force of the third reset member 52, causing the first slider 51 to move to the second position; until the tool holder assembly 30 moves to the working position, and then under the action of the third reset member 52, the first slider 51 returns to the first position, and the tool changing surface 5111 and the mating surface 3111 are once again positioned opposite each other along the length direction of the utility knife 1. It is worth mentioning that the first guide surface 5112 and the second guide surface 3112 can be implemented as a plane or an arc surface, respectively, and this application does not impose specific limitations on this.

[0106] In some embodiments, such as Figures 21-29 As shown, the tool changing assembly 50 also includes a second slider 53. The first slider 51 has a first retaining structure 512 on the side facing the second slider 53, and the second slider 53 has a second retaining structure 531 on the side facing the first slider 51. The first retaining structure 512 and the second retaining structure 531 are adapted to be engaged with each other so that the tool changing protrusion 511 and the mating protrusion 311 are kept misaligned in the length direction of the utility knife 1.

[0107] In other words, such as Figure 23 and Figure 25 As shown, when both the first slider 51 and the second slider 53 are in the first position, the blade changing surface 5111 on the first slider 51 and the mating surface 3111 on the blade holder body 31 are spaced apart and opposite to each other along the length direction of the utility knife 1, and the second holding structure 531 on the second slider 53 and the first holding structure 512 on the first slider 51 are disengaged. When both the first slider 51 and the second slider 53 are in the second position, as... Figure 27As shown, the blade changing surface 5111 on the first slider 51 and the mating surface 3111 on the blade holder body 31 are offset in the length direction of the utility knife 1. The second holding structure 531 on the second slider 53 and the first holding structure 512 on the first slider 51 are engaged, so that the first slider 51 can be held in the second position.

[0108] It should be understood that when the user moves the first slider 51 from the first position to the second position, the second slider 53 can keep the first slider 51 in the second position; in other words, the user does not need to press down on the first slider 51 to keep it in the second position while pushing the blade holder assembly 30 forward to the blade changing position. This design makes it easier for the user to control the utility knife 1 with one hand, which is beneficial for one-handed operation and improves the operability and interactivity of the utility knife 1. For example, the user can first use their index finger to move the first slider 51 to the second position, then release their index finger to adjust their grip, and then use their thumb to push the blade holder assembly 30 to the blade changing position.

[0109] In at least one embodiment, such as Figures 21-29 As shown, one of the first retaining structure 512 and the second retaining structure 531 is implemented as a slot, and the other of the first retaining structure 512 and the second retaining structure 531 is implemented as a plug, which is adapted to engage with the slot. The above description of the first retaining structure 512 and the second retaining structure 531 is exemplary, and those skilled in the art can adjust the specific structure according to actual usage requirements. Such adjustments are all within the protection scope of this invention.

[0110] In some embodiments, such as Figures 21-29 As shown, the blade changing assembly 50 also includes a fourth reset member 54, which is connected between the second slider 53 and the housing assembly 10. Specifically, the fourth reset member 54 is connected between the first slider 51 and the second blade housing 12, providing a force to the second slider 53 to move towards the second position, so that the first retaining structure 512 and the second retaining structure 531 remain engaged. That is, when the first slider 51 moves from the first position to the second position, so that the first retaining structure 512 and the second retaining structure 531 are opposite each other along the length direction of the utility knife 1, under the action of the fourth reset member 54, the second slider 53 can automatically move from the first position to the second position, so that the first retaining structure 512 and the second retaining structure 531 are engaged.

[0111] In some embodiments, such as Figures 21-29As shown, a tool changing groove 317 is provided on the side of the tool holder assembly 30 facing the tool changing assembly 50. The tool changing groove 317 extends along the length of the utility knife 1, and one of the groove walls of the tool changing groove 317 forms a reset wall 3171. Specifically, the tool changing groove 317 is provided at the base 312 of the tool holder body 31. Further, a sliding post 532 is provided on the side of the second slider 53 facing the tool holder body 31. The sliding post 532 is adapted to move within the tool changing groove 317. The sliding post 532 and the reset wall 3171 are arranged opposite each other at intervals along the length of the utility knife 1. When the tool holder assembly 30 moves to the tool changing position, the reset wall 3171 abuts against the sliding post 532, thereby pushing the second slider 53 to move to the first position, so that the first holding structure 512 and the second holding structure 531 disengage.

[0112] Specifically, when the tool holder assembly 30 moves close to the tool changing position, the reset wall 3171 abuts against the slide column 532; as the tool holder assembly 30 continues to move towards the tool changing position, the cooperation between the reset wall 3171 and the slide column 532 pushes the second slider 53 to move towards the first position, i.e., along... Figure 27 and Figure 28 The slider moves to the right as shown, causing the first retaining structure 512 and the second retaining structure 531 to disengage, thereby allowing the first slider 51 to move to the first position under the action of the third reset member 52.

[0113] Furthermore, as mentioned above, when the tool holder assembly 30 moves from the tool changing position to the initial position, through the cooperation of the first guide surface 5112 and the second guide surface 3112, the tool holder assembly 30 can overcome the force of the third reset member 52, causing the first slider 51 to move to the second position. It should be understood that during this process, if... Figure 29 As shown, although the first slider 51 moves to the second position, allowing the tool-changing protrusion 511 to avoid the mating protrusion 311, the first slider 51 does not move to the second position. Instead, it remains between the first and second positions, thus preventing the first slider 51 and the second slider 53 from engaging. Furthermore, when the tool holder assembly 30 moves to the working position, under the action of the third reset member 52, the first slider 51 returns to the first position, and the tool-changing surface 5111 and the mating surface 3111 are once again positioned opposite each other along the length of the utility knife 1.

[0114] In other words, when the user needs to change the blade 90, only one operation is required on the first slider 51; that is, the user only needs to move the first slider 51 from the first position to the second position to smoothly complete subsequent operations, such as moving the blade holder assembly 30 to the blade changing position, removing the blade 90, and then moving the blade holder assembly 30 back to the initial position. This improves the operability and interactivity of the utility knife 1, facilitates one-handed operation of the utility knife 1, and improves the user's work efficiency.

[0115] It is worth mentioning that in this embodiment, the reset wall 3171 only abuts against the slide column 532 when the blade holder assembly 30 moves close to the blade changing position. This helps to reduce the stroke of the second slider 53, thereby reducing the space occupied by the second slider 53 during movement and making the internal structure of the utility knife 1 more compact. In other embodiments, depending on the actual situation, the reset wall 3171 may abut against the slide column 532 when the blade holder assembly 30 moves to other positions between the working position and the blade changing position. This application does not impose specific limitations on this.

[0116] In at least one embodiment, the blade changing assembly 50 and the blade holder assembly 30 are stacked along the thickness direction of the utility knife 1. The blade changing assembly 50 can move in a plane perpendicular to the thickness direction of the utility knife 1. Specifically, the first slider 51 is adapted to move along the width direction of the utility knife 1, and the second slider 53 is arranged along the length direction of the utility knife 1. The second slider 53 is adapted to move along the length direction of the utility knife 1, which helps to avoid unnecessary interference between the blade changing assembly 50 and the blade holder assembly 30, thereby improving the smoothness of the movement of the blade changing assembly 50 and the blade holder assembly 30. In addition, keeping the blade changing assembly 50 in a plane perpendicular to the thickness direction of the utility knife 1 can also reduce the space occupied by the blade changing assembly 50 during movement, making the internal structure of the utility knife 1 more compact, and thus reducing the overall size of the utility knife 1. The above description of the setting position of the blade changing assembly 50 and the arrangement direction of the first slider 51 and the second slider 53 is exemplary. Those skilled in the art can adjust the specific structure according to actual usage needs, and such adjustments are all within the protection scope of this invention.

[0117] In some embodiments, such as Figure 30 As shown, the tool changing assembly 50 also includes a support plate 60 mounted on the housing assembly 10. The support plate 60 includes a first support portion 61, which is spaced apart from the housing assembly 10 to form a mounting space 612 between the first support portion 61 and the housing assembly 10. The tool changing assembly 50 is accommodated within the mounting space 612 and is movable within the mounting space 612. It should be understood that the tool changing assembly 50 is positioned between the first support portion 61 and the second housing, which improves the reliability and stability of the movement of the tool changing assembly 50. Furthermore, the tool changing assembly 50 and the tool holder assembly 30 are separated by the first support portion 61, which helps to prevent the tool changing assembly 50 from causing unnecessary interference to the tool holder assembly 30.

[0118] In at least one embodiment, such as Figure 30As shown, the first support part 61 is provided with a clearance hole 611. The clearance hole 611 extends along the length direction of the utility knife 1. The clearance hole 611 allows the slide post 532 of the second slider 53 to pass through, and the slide post 532 can extend into the tool changing groove 317 of the tool holder assembly 30.

[0119] In some embodiments, such as Figure 30 As shown, the support plate 60 also includes a second support portion 62 connected to the first support portion 61. The second support portion 62 and the first support portion 61 are spaced apart. A limiting groove 621 is formed between the second support portion 62 and the first support portion 61, and / or a limiting groove 621 is formed between the second support portion 62 and the outer shell assembly 10. The limiting groove 621 extends along the length direction of the utility knife 1. A portion of the knife holder assembly 30 is accommodated in the limiting groove 621. Specifically, the lower edge of the base 312 of the knife holder body 31 is accommodated in the limiting groove 621.

[0120] It should be understood that the limiting groove 621 can limit the movement of the knife holder body 31; and the base 312 and the second support 62 are arranged opposite each other along the thickness direction of the utility knife 1, so that the second support 62 can support the knife holder body 31. This arrangement improves the stability of the knife holder assembly 30, and even when the knife box assembly 20 is removed, the knife holder assembly 30 can remain in its initial position, which helps to prevent the knife holder assembly 30 from tilting due to the loss of the support of the knife box assembly 20.

[0121] In some embodiments, such as Figure 18 As shown, the utility knife 1 also includes a drive assembly 80 for locking the blade holder assembly 30 and the housing assembly 10, and for driving the blade holder assembly 30 to move relative to the housing assembly 10. Specifically, the drive assembly 80 includes a spring 81 and a drive button 82. One end of the spring 81 is connected to the blade holder body 31, and the other end of the spring 81 is connected to the drive button 82. Further, a groove 123 is provided on the housing assembly 10; the spring 81 can be elastically deformed so that the drive assembly 80 can be separably engaged with the groove 123, thereby allowing the blade holder assembly 30 to be held in the initial position or the working position, thus facilitating cutting operations. Further, at least a portion of the drive button 82 is exposed on the housing assembly 10 so that the user can push the blade holder assembly 30 by using the drive button 82.

[0122] In at least one embodiment, such as Figure 3As shown, the second blade housing 12 has at least four grooves 123 arranged along the length of the utility knife 1. The spring piece 81 of the drive assembly 80 engages with the grooves 123, allowing the blade holder assembly 30 to be held in an initial position, a working position, a transition position, or a blade-changing position. The transition position is located between the initial and working positions, and there can be one or more transition positions. This allows adjustment of the length of the blade 90 extending from the blade outlet 14, making the utility knife 1 suitable for different cutting needs, such as… Figure 31 As shown. The tool change position is closer to the tool outlet port 14 than the working position. When the tool holder assembly 30 is in the tool change position, the blade 90 is fully exposed, or most of the blade 90 is exposed.

[0123] The basic principles, main features, and advantages of this invention have been described above. Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made without departing from the spirit and scope of the invention, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection claimed by this invention is defined by the appended claims and their equivalents.

Claims

1. A utility knife, characterized in that, include: A housing assembly, the housing assembly having a receiving cavity, a tool delivery port and a mounting port, the tool delivery port being located at the front end of the housing assembly; A blade holder assembly, which is installed within the receiving cavity for housing multiple blades, is adapted to be removed from the mounting port; A blade holder assembly is installed within the receiving cavity to hold a blade. The blade holder assembly is adapted to move along the length of the utility knife so that the blade extends from the blade outlet port. The blade holder assembly has a mating surface. A locking assembly is movable between a locked position and an unlocked position. When the locking assembly is in the locked position, it engages with the knife box assembly, keeping the knife box assembly within the receiving cavity. When the locking assembly is in the unlocked position, it disengages from the knife box assembly, allowing the knife box assembly to be removed from the mounting port. A blade changing assembly is movable between a first position and a second position. The blade changing assembly has a blade changing surface. When the blade changing assembly is in the first position, the blade changing surface and the mating surface of the blade holder assembly are spaced apart and opposite to each other along the length direction of the utility knife, allowing the blade holder assembly to move between an initial position and a working position. When the blade changing assembly is in the second position, the blade changing surface and the mating surface are misaligned along the length direction of the utility knife, allowing the blade holder assembly to continue moving from the working position to the blade changing position, so that the blade is fully exposed.

2. The utility knife according to claim 1, characterized in that, The blade holder assembly and the blade box assembly are stacked along the thickness direction of the utility knife, and the blade holder assembly is able to engage a blade from the blade box assembly and carry the blade out from the blade outlet port.

3. The utility knife according to claim 1 or 2, characterized in that, The knife box assembly has a fitting groove; the locking assembly includes a stop block and a first reset member. The stop block includes a connecting portion and a fitting portion. The connecting portion is used to slide with the outer shell assembly, so that the stop block can move between a locked position and an unlocked position. The fitting portion extends from the connecting portion to the knife box assembly and can be separably fitted with the fitting groove. The first reset member is connected between the stop block and the outer shell assembly, so as to provide a force to the stop block to move toward the locked position.

4. The utility knife according to claim 3, characterized in that, The tool holder assembly includes a tool holder body, a pressing member, and a second resetting member. The tool holder body is used to carry the blade. The pressing member is hinged to the tool holder body. The second resetting member is connected between the pressing member and the tool holder body, thereby providing a rotational force to the pressing member in a direction away from the blade. The locking assembly also includes a rotatable rotating plate, which is movably connected to the stop block, and the stop block drives the rotating plate to rotate. When the stop block is in the unlocked position and the blade holder assembly is in the initial position, one end of the rotating plate abuts against the pressing member, causing the pressing member to push the blade toward the blade box assembly.

5. The utility knife according to claim 4, characterized in that, When the tool holder assembly is in the working position, one end of the rotating plate is adapted to abut against the tool holder body, so that the stop block is engaged with the fitting groove of the tool box assembly.

6. The utility knife according to claim 1 or 2, characterized in that, The utility knife also includes a pop-out component located between the outer shell assembly and the knife box assembly. The pop-out component is adapted to abut against the knife box assembly to provide a force to the knife box assembly to move toward the mounting port.

7. The utility knife according to claim 1 or 2, characterized in that, The tool holder assembly includes a tool holder body for carrying a blade. The tool holder body has a mating protrusion on its side facing the tool changing assembly, and the mating surface is located on the mating protrusion. The blade changing assembly includes a first slider, on which a blade changing protrusion is provided on the side facing the blade holder body. The blade changing surface is located on the blade changing protrusion. The first slider is adapted to move between a first position and a second position so that the blade changing protrusion and the mating protrusion on the blade holder body are spaced apart and opposite to each other along the length direction of the utility knife, or are misaligned along the length direction of the utility knife.

8. The utility knife according to claim 7, characterized in that, The blade changing assembly further includes a second slider. The first slider has a first retaining structure on its side facing the second slider, and the second slider has a second retaining structure on its side facing the first slider. The first retaining structure and the second retaining structure are adapted to be engaged with each other so that the blade changing protrusion and the mating protrusion are misaligned in the length direction of the utility knife.

9. The utility knife according to claim 8, characterized in that, The blade changing assembly further includes a third reset member and a fourth reset member. The third reset member is connected between the first slider and the housing assembly, and provides a force to the first slider to move toward a first position, so that the blade changing protrusion and the mating protrusion remain oppositely positioned along the length of the utility knife. The fourth reset member is connected between the second slider and the housing assembly, and provides a force to the second slider to move toward a second position, so that the first retaining structure and the second retaining structure remain engaged.

10. The utility knife according to claim 2, characterized in that, The blade box assembly includes a main blade box and a top plate. The main blade box has a placement slot for accommodating multiple blades. The top plate is elastically deformable and is disposed in the placement slot on the side wall facing the blade holder assembly, thereby providing a force to the blades to move toward the blade holder assembly. The blade holder assembly includes a blade holder body with a engagement groove for accommodating a blade; the blade holder body also includes a first engagement portion protruding from the engagement groove toward the side wall of the main blade box, the first engagement portion extending into the placement groove and engaging with a notch of a blade. The blade holder assembly also includes a mounting strip that protrudes from the engagement groove toward the side wall of the main blade housing and extends into an opening in the placement groove for a blade. The blade holder assembly has a blade changing groove on its side facing the blade changing assembly. The blade changing groove extends along the length of the utility knife, and one of the groove walls forms a reset wall. The second slider of the blade changing assembly has a sliding post protruding from the side of the blade holder body. The sliding post is adapted to move within the blade changing slot. The sliding post and the reset wall are spaced apart and opposite to each other along the length of the utility knife. When the blade holder assembly moves to the blade changing position, the reset wall abuts against the sliding post, thereby pushing the second slider to move to the first position, so that the first holding structure and the second holding structure disengage. The tool changing assembly further includes a support plate mounted on the housing assembly. The support plate includes a first support portion, which is spaced apart from the housing assembly to form an installation space between the first support portion and the housing assembly. The tool changing assembly is accommodated within the installation space. The support plate further includes a second support portion connected to the first support portion. The second support portion and the first support portion are spaced apart. A limiting groove is formed between the second support portion and the first support portion, and / or a limiting groove is formed between the second support portion and the outer shell assembly. The limiting groove extends along the length direction of the utility knife, and a portion of the knife holder assembly is accommodated in the limiting groove.

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