Utility knife provided with automatically retractable blade

Abstract

A utility knife provided with an automatically retractable blade, said knife comprising: a blade housing (10), the blade housing being provided with a containing cavity (13) and an end opening (14), and the end opening being formed at a front end of the blade housing; a blade holder (30), the blade holder being used for bearing a blade (40), the blade holder being movably mounted in the containing cavity, the blade holder being connected to the blade housing by means of a first elastic member (30), and a locking assembly (70) being provided between the blade housing and the blade holder, so that the blade holder can be detachably fixed to the blade housing; and a driving member (20), the driving member being movably mounted in the containing cavity, and the driving member being detachably connected to the blade holder so as to drive the blade holder to move. During operation, the blade holder rotates so as to separate from the driving member, and the blade holder is fixed to the blade housing by means of the locking assembly; after operation ends, when the blade leaves from an object to be cut, the locking assembly is unlocked under the action of the first elastic member, so that the blade holder can move relative to the blade housing, to retract the blade into the containing cavity, thus preventing accidental injury from occurring.

Description

Utility knife with automatically retractable blade Technical Field

[0001] The invention relates to the technical field of cutters, in particular to a utility knife with an automatically retractable blade. Background Art

[0002] A utility knife is a commonly used art and craft tool, primarily used for cutting materials such as paper, cardboard, and leather. Utility knives are typically pull-out, consisting of a housing and a blade. A push button moves the blade longitudinally along the housing's axis.

[0003] In order to prevent injuries to people due to the blade not being retracted into the knife shell in time after cutting objects, some utility knives have the function of automatically retracting the blade. That is, by pressing the handle, the blade is extended out of the shell. After use, release the handle and the blade will automatically retract into the shell.

[0004] However, if the user subconsciously holds the handle when stopping the operation, causing the blade to not retract into the knife housing, the user may easily injure himself or others by swinging the utility knife.

[0005] Summary of the Invention

[0006] One purpose of the present invention is to provide a utility knife with an automatically retractable blade, wherein the blade holder can be separated from the driving member by rotation and fixed to the knife housing by a locking assembly, thereby facilitating cutting operations. When the cutting operation is completed, the blade leaves the cutting object and the blade holder is retracted into the accommodating cavity by the first elastic member. The blade holder can be retracted into the accommodating cavity without operating the driving member, thereby avoiding accidental injury.

[0007] Another object of the present invention is to provide a utility knife with an automatically retractable blade, which controls a driving member through a handle, so that the rotation of the handle relative to the knife housing is converted into the movement of the driving member relative to the knife housing, which is easy to operate.

[0008] Another object of the present invention is to provide a utility knife with an automatically retractable blade, wherein the locking assembly is composed of a slot located on the inner wall of the knife housing and a stop portion located on the knife seat, and has a simple structure and does not require the addition of complex accessories.

[0009] Another object of the present invention is to provide a utility knife with an automatically retracting blade, wherein a stop portion and a guide portion are provided at intervals at the rear end of the knife holder, and a coupling groove is formed between the stop portion and the guide portion. The knife holder is driven to move by the coupling portion of the driving member cooperating with the coupling groove. When the operation is completed, the blade leaves the cutting object and the coupling portion of the driving member is disengaged from the coupling groove along the guide portion, so that the knife holder retracts back into the accommodating cavity to avoid accidental injury. The structure is compact, which is conducive to reducing the volume of the tool.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is: a utility knife with automatically retracting blade, comprising: a blade housing, the blade housing being provided with a accommodating cavity and a port, the port being opened at the front end of the blade housing; a blade holder, the blade holder being used to carry the blade, the blade holder being movably mounted in the accommodating cavity, the blade holder being connected to the blade housing via a first elastic member, a locking assembly being provided between the blade housing and the blade holder, so that the blade holder can be detachably fixed to the blade housing; a driving member, the driving member being movably mounted in the accommodating cavity, and the driving member being detachably connected to the blade holder so as to drive the blade holder to move; wherein, during operation, the blade holder is rotated to be separated from the driving member, and the blade holder is fixed to the blade housing via the locking assembly; when the operation is completed, the blade leaves the object to be cut, and the locking assembly is unlocked under the action of the first elastic member, and the blade holder is able to move relative to the blade housing, so that the blade retracts into the accommodating cavity.

[0011] As a preference, the driving member is connected to the knife housing through a second elastic member, one end of the driving member is detachably abutted against the knife seat, and the other end of the driving member is provided with a driving surface, and the driving surface is set at an angle to the moving direction of the driving member; the utility knife with automatically retracting blade also includes a handle, and the handle is hingedly mounted on the knife housing, and a driving part is provided on the handle, and the driving part abuts against the driving surface, so as to convert the rotation of the handle relative to the knife housing into movement of the driving member relative to the knife housing; wherein, pressing the handle can cause the driving part to push the knife seat to move, so that the blade is exposed from the port; releasing the handle, the driving member and the handle can return to their initial positions under the action of the second elastic member.

[0012] As a preference, the locking assembly includes a slot located in the knife housing and a stop portion located in the knife seat, the slot is located on the inner wall of the front end of the knife housing, and the stop portion is protrudingly provided on the knife seat; during operation, the stop portion is suitable for engaging with the slot, so that the knife seat can be detachably fixed to the knife housing.

[0013] As a preference, a fulcrum portion is further provided on the knife holder; during operation, the fulcrum portion abuts against the knife housing, and the knife holder is able to rotate around the fulcrum portion, so that the knife holder is separated from the driving member, and the stop portion is engaged with the slot.

[0014] As a preference, the knife holder and the driving member are arranged in a stacked manner, and the rear end of the knife holder is provided with a stop portion and a guide portion at intervals, and the stop portion and the guide portion protrude from the knife holder toward the side where the driving member is located; when the knife holder is retracted to the accommodating cavity, the stop portion is suitable for abutting against the knife housing, and the upper surface of the guide portion is inclined along the longitudinal direction of the knife housing, and a coupling groove is formed between the stop portion and the guide portion; the front end of the driving member is provided with a coupling portion protruding toward the side where the knife holder is located, and the coupling portion is suitable for sliding along the upper surface of the guide portion so that the coupling portion is combined with or separated from the coupling groove; when the coupling portion is accommodated in the coupling groove, the coupling portion is able to abut against the rear end surface of the guide portion to push the knife holder to move.

[0015] As a preference, the knife housing includes an upper shell and a lower shell, and the knife seat and the driving member are accommodated in the accommodating cavity between the upper shell and the lower shell; the inner wall of the lower shell is protrudingly provided with slender upper ribs and lower ribs, and a movable groove is formed between the upper ribs and the lower ribs, and the knife seat is suitable for translation and / or rotation along the movable groove; the inner wall of the upper shell is protrudingly provided with a slide, and the driving member abuts against the slide, so as to be able to move along the slide in the accommodating cavity.

[0016] As a preference, the card slot includes a first card slot and a second card slot, several of the first card slots are located at the front end of the upper rib and are arranged along the extension direction of the upper rib; several of the second card slots are located at the rear end of the lower rib and are arranged along the extension direction of the lower rib; the stop portion includes a first stop portion and a second stop portion, the first stop portion is protrudingly provided at the front end of the upper side of the knife seat, suitable for being engaged with the first card slot, and the second stop portion is protrudingly provided at the rear end of the lower side of the knife seat, suitable for being engaged with the second card slot.

[0017] As a preference, the rear end of the knife holder is provided with a first hook, the lower shell is protrudingly provided with a first hanging column, and the first elastic member is connected between the first hook and the first hanging column, so as to provide a force for the knife holder to retract back into the accommodating cavity, and at the same time provide a torque to the knife holder, so that the knife holder rotates to separate the stop portion and the slot on the knife shell.

[0018] As a preference, a plurality of slender first support ribs are protrudingly provided between the upper ribs and the lower ribs of the lower shell, and the first support ribs abut against the back of the knife holder. The inner wall of the upper shell is protrudingly provided with second support ribs, and the second support ribs abut against the front of the knife holder, so that the knife holder can be clamped between the upper shell and the lower shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a schematic diagram of a utility knife with an automatically retracting blade according to some embodiments of the present application;

[0020] FIG2 is a schematic diagram of a utility knife with an automatically retracting blade according to some embodiments of the present application;

[0021] FIG3 is a diagram illustrating the internal structure of a utility knife with an automatically retracting blade according to some embodiments of the present application;

[0022] FIG4 is a diagram illustrating the internal structure of a utility knife with an automatically retracting blade according to some embodiments of the present application;

[0023] FIG5 is a diagram illustrating the internal structure of a utility knife with an automatically retracting blade according to some embodiments of the present application;

[0024] FIG6 is a diagram illustrating the internal structure of a utility knife with an automatically retracting blade according to some embodiments of the present application;

[0025] 7 is a diagram illustrating the internal structure of a utility knife with an automatically retracting blade according to some embodiments of the present application;

[0026] FIG8 is a schematic diagram of the installation of a knife holder of a utility knife with an automatically retracting blade according to some embodiments of the present application;

[0027] FIG9 is a schematic structural diagram of a lower shell according to some embodiments of the present application;

[0028] FIG10 is a schematic structural diagram of an upper shell according to some embodiments of the present application;

[0029] FIG11 is a schematic structural diagram of a knife holder according to some embodiments of the present application;

[0030] FIG12 is a schematic structural diagram of a driving member according to some embodiments of the present application;

[0031] 13 is a diagram illustrating the internal structure of a utility knife with an automatically retracting blade according to some embodiments of the present application;

[0032] FIG14 is a partial enlarged view of point A in FIG13;

[0033] FIG15 is a schematic diagram of the separation of the stopper of the knife holder and the slot of the knife housing according to some embodiments of the present application;

[0034] FIG16 is a schematic diagram of the engagement between the stop portion of the knife holder and the slot of the knife housing according to some embodiments of the present application.

[0035] In the figure: 10, knife housing; 11, upper housing; 111, slideway; 112, second supporting rib; 113, second hanging column; 114, fourth supporting rib; 115, knife changing panel; 1151, elastic part; 12, lower housing; 121, upper rib; 122, lower rib; 123, movable groove; 124, clamping groove; 1241, first clamping groove; 1242, second clamping groove; 125, first hanging column; 126, first supporting rib; 127, third supporting rib; 1271, travel groove; 128, guide part; 13, accommodating chamber; 14, port; 20, driving member; 21, second elastic member; 22 , driving surface; 23, engaging portion; 24, second hook; 25, accommodating groove; 26, extending portion; 27, stopping portion; 261, sliding groove; 30, blade seat; 31, first elastic member; 32, stopping portion; 321, first stopping portion; 322, second stopping portion; 33, fulcrum portion; 34, stopping portion; 35, guiding portion; 36, engaging groove; 37, first hook; 38, blade groove; 381, magnetic suction groove; 39, mounting portion; 40, blade; 41, limiting opening; 50, handle; 51, driving portion; 52, limiting boss; 53, rotating wheel; 60, safety push button; 70, locking assembly. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0037] In the description of the present invention, it should be noted that, for directional words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of the present invention.

[0038] It should be noted that the terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0039] It should be noted that the terms "front", "back", etc. are used to indicate directions to facilitate the description of the present invention and simplify the description, rather than to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. It can also be expressed as "above", "below", or "one side", "the other side", etc., and cannot be understood as limiting the specific scope of protection of the present invention.

[0040] A utility knife with an automatically retractable blade, as shown in Figures 1-8, comprises a blade housing 10, a blade holder 30, and a drive member 20. The blade housing 10 is provided with a receiving cavity 13 and a port 14, with the port 14 located at the front end of the blade housing 10. The blade holder 30 is used to carry a blade 40. The blade holder 30 is movably mounted within the receiving cavity 13 and is connected to the blade housing 10 via a first elastic member 31. Furthermore, a locking assembly 70 is provided between the blade housing 10 and the blade holder 30, allowing the blade holder 30 to be detachably fixed to the blade housing 10. The drive member 20 is movably mounted within the receiving cavity 13 and detachably connected to the blade holder 30 to drive the blade holder 30 to move. During operation, the blade holder 30 rotates to separate from the drive member 20, and the blade holder 30 is secured to the blade housing 10 via the locking assembly 70. When the blade 40 leaves the object to be cut after the operation is completed, the locking assembly 70 is unlocked under the action of the first elastic member 31 , and the blade holder 30 is able to move relative to the blade housing 10 , so that the blade 40 is retracted into the accommodating cavity 13 .

[0041] That is, as shown in Figures 5 and 6, during the cutting operation, the blade 40 contacts the object to be cut, generating a torque that causes the blade holder 30 to rotate, thereby separating the blade holder 30 from the drive member 20 and being secured to the blade housing 10 via the locking assembly 70, thereby preventing the blade holder 30 from retracting back into the accommodating chamber 13 during cutting, thereby facilitating the cutting operation. As shown in Figure 7, after the cutting operation is completed, the blade 40 is disengaged from the object to be cut, and under the action of the first elastic member 31, the locking assembly 70 is unlocked, allowing the blade holder 30 to separate from the blade housing 10 and move relative to the drive member 20, retracting back into the accommodating chamber 13, thereby preventing the blade 40 from being exposed in the blade housing 10 and causing accidental injury to the human body.

[0042] In some embodiments, as shown in Figures 4 and 6 , the driver 20 is connected to the blade housing 10 via a second elastic member 21. One end of the driver 20 detachably abuts against the blade holder 30, and the other end of the driver 20 is provided with a driving surface 22, which is arranged at an angle to the direction of movement of the driver 20. Furthermore, the utility knife with an automatically retracting blade also includes a handle 50, which is hingedly mounted to the blade housing 10 and provided with a driving portion 51. The driving portion 51 abuts against the driving surface 22, thereby converting rotation of the handle 50 relative to the blade housing 10 into movement of the driver 20 relative to the blade housing 10. In other words, by pressing the handle 50, the driving portion 51 pushes the blade holder 30 to move, exposing the blade 40 from the port 14. Release the handle 50, and the driver 20 and handle 50 return to their initial positions under the action of the second elastic member 21.

[0043] Specifically, by pressing the handle 50, the driving portion 51 cooperates with the driving surface 22, causing the driving member 20 to move relative to the blade housing 10. The driving member 20 then pushes the blade holder 30 to move, causing the blade 40 to extend from the port 14 into the accommodating chamber 13. During the cutting operation, the blade 40 contacts the object to be cut, generating a torque that causes the blade holder 30 to rotate. This allows the blade holder 30 to separate from the driving member 20 and be secured to the blade housing 10 via the locking assembly 70, facilitating the cutting operation. After the cutting operation is completed, the blade 40 is disengaged from the object to be cut. Under the action of the first elastic member 31, the blade holder 30 is separated from the blade housing 10 and retracted into the accommodating chamber 13, preventing accidental injury from swinging the knife. In other words, after the cutting operation is completed, there is no need to release the handle 50 to allow the driving member 20 to drive the blade holder 30 back into the accommodating chamber 13. Furthermore, after releasing the handle 50, under the action of the second elastic member 21, the driving member 20 and the handle 50 are restored to their initial positions, and the driving member 20 and the blade holder 30 are engaged. When the handle 50 is pressed next time, the driving member 20 is able to push the blade holder 30 to move relative to the blade housing 10.

[0044] It is understood that after stopping operation, the blade holder 30 and blade 40 have retracted into the accommodating cavity 13 under the action of the first elastic member 31. Even if the user subconsciously continues to hold the handle 50 or even swings the knife, the blade 40 will not cause harm. Moreover, to use the utility knife again, they only need to release and then press the handle 50, which is easy to operate.

[0045] Furthermore, as shown in Figures 5 and 6 , the utility knife with the automatically retracting blade 40 further includes a rotating wheel 53, which is rotatably mounted on the drive portion 51 of the handle 50 and abuts against the drive surface 22 of the drive member 20. In other words, the handle 50, through the rotating wheel 53 mounted on the drive portion 51, abuts against the drive surface 22 of the drive member 20. The rotating wheel 53 and the drive surface 22 are in rolling contact, thereby reducing friction and improving the smoothness of the movement of the drive member 20 and the blade holder 30 when the handle 50 is pressed during use. This also helps reduce wear on the handle 50 and the drive member 20, thereby extending the service life of the tool.

[0046] Furthermore, as shown in Figures 3 and 5, a limiting boss 52 is protruding from the side of the handle 50. When the handle 50 is in the initial position, the limiting boss 52 abuts against the inner wall of the knife housing 10, so that at least part of the handle 50 remains in the accommodating cavity 13, thereby shielding the accommodating cavity 13.

[0047] In some embodiments, as shown in Figures 8, 9 and 11, the locking assembly 70 includes a slot 124 located in the knife housing 10 and a stop portion 32 located in the knife seat 30. The slot 124 is located on the inner wall of the front end of the knife housing 10, and the stop portion 32 is protrudingly provided on the knife seat 30. During operation, the stop portion 32 is suitable for being engaged with the slot 124, so that the knife seat 30 can be detachably fixed to the knife housing 10.

[0048] It can be understood that, during non-cutting operations, the slot 124 of the blade housing 10 is disengaged from the stop portion 32 of the blade holder 30. Specifically, before the cutting operation, the blade holder 30 is driven by the driving member 20 to move so that the blade 40 extends or retracts back into the accommodating chamber 13, or after the cutting operation, the blade holder 30 is separated from the driving member 20 and is retracted back into the accommodating chamber 13 under the action of the first elastic member 31.

[0049] During cutting, the blade 40 abuts against the object to be cut, generating a torque on the blade holder 30, causing the blade holder 30 to rotate. Furthermore, the protruding stopper 32 on the blade holder 30 abuts against the recessed slot 124 on the inner wall of the blade housing 10, thereby securing the blade holder 30 to the blade housing 10 and preventing the blade 40 from retracting into the accommodating cavity 13 during cutting. In other words, the blade housing 10 and the blade holder 30 are secured together by the recessed slot 124 and the protruding stopper 32, resulting in a simple structure that allows the blade housing 10 and the blade holder 30 to be secured during cutting without the need for complex accessories.

[0050] Furthermore, as shown in FIG9 , the blade holder 30 is provided with a fulcrum portion 33. During operation, the fulcrum portion 33 abuts against the inner wall of the blade housing 10, allowing the blade holder 30 to rotate about the fulcrum portion 33, thereby separating the blade holder 30 from the driving member 20 and causing the stop portion 32 to engage with the engaging groove 124. It is understood that the fulcrum portion 33 can be protrudingly provided on the blade holder 30, or a corner of the blade holder 30 can serve as the fulcrum portion 33, that is, the corner of the blade holder 30 abuts against the blade housing 10, allowing the blade holder 30 to rotate about its corner.

[0051] In an optional embodiment, the fulcrum portion 33 is protrudingly provided on the upper side of the knife seat 30. When the blade 40 is against the object to be cut, the fulcrum portion 33 on the knife seat 30 is against the inner wall of the knife housing 10, and the knife seat 30 rotates with the contact point between the fulcrum portion 33 and the knife housing 10 as the rotation center, so that the knife seat 30 is separated from the driving member 20, and the stop portion 32 on the knife seat 30 is engaged with the slot 124 on the knife housing 10, so that the knife seat 30 is fixed to the knife housing 10.

[0052] In some embodiments, as shown in Figures 3-7, the blade holder 30 and the driving member 20 are stacked. A stopper 34 and a guide 35 are provided at intervals at the rear end of the blade holder 30. The stopper 34 and the guide 35 protrude from the blade holder 30 toward the side where the driving member 20 is located. When the blade holder 30 is retracted into the accommodating cavity 13, the stopper 34 is adapted to abut against the blade housing 10. The upper surface of the guide 35 is inclined along the longitudinal direction of the blade housing 10. An engagement groove 36 is formed between the stopper 34 and the guide 35, making the structure of the blade holder 30 more compact. The front end of the driving member 20 is provided with an engagement portion 23 protruding toward one side of the blade holder 30. The engagement portion 23 is adapted to slide along the upper surface of the guide 35 so as to engage or disengage with the engagement groove 36. When the engagement portion 23 is accommodated in the engagement groove 36, the engagement portion 23 abuts against the rear end surface of the guide 35 to push the blade holder 30 to move.

[0053] Specifically, when the handle 50 is pressed, the handle 50 cooperates with the driving surface 22 of the driving member 20 through the rotating wheel 53, thereby driving the driving member 20 to move toward the front end of the blade housing 10. At this time, the engaging portion 23 of the driving member 20 is accommodated in the engaging groove 36 of the blade holder 30, and the front end of the engaging portion 23 abuts against the rear end of the guide portion 35, thereby pushing the blade holder 30 to move toward the front end of the blade housing 10, so that the blade 40 is exposed from the port 14.

[0054] As shown in Figures 5 and 6 , during a cutting operation, the blade 40 abuts against the object to be cut, causing the blade holder 30 to rotate, and the engaging portion 23 then moves out of the engaging slot 36 from the upper opening of the engaging slot 36, separating the blade holder 30 from the driving member 20. As shown in Figure 7 , after the cutting operation is completed, the blade 40 is disengaged from the object to be cut, and the blade holder 30, under the action of the first elastic member 31, retracts into the accommodating cavity 13 until the stop portion 34 abuts against the inner wall of the blade housing 10. Simultaneously, the engaging portion 23 of the driving member 20 moves along the upper surface of the guide portion 35 in a direction away from the engaging slot 36. As shown in Figures 3 and 4, when the handle 50 is released, the driving member 20 and the handle 50 return to their initial positions under the action of the second elastic member 21. At the same time, the engaging portion 23 of the driving member 20 moves along the upper surface of the guide portion 35 toward the engaging groove 36 until it falls into the engaging groove 36. The driving member 20 engages with the knife seat 30 again, so that the driving member 20 pushes the knife seat 30 toward the front end of the knife housing 10 when the handle 50 is pressed next time.

[0055] In some embodiments, as shown in Figures 8-10, the blade housing 10 includes an upper housing 11 and a lower housing 12. The blade holder 30 and the driving member 20 are accommodated in the accommodating chamber 13 between the upper housing 11 and the lower housing 12. Furthermore, the inner wall of the lower housing 12 is protrudingly provided with an elongated upper rib 121 and a lower rib 122. A movable groove 123 is formed between the upper rib 121 and the lower rib 122. The blade holder 30 is adapted to translate and / or rotate along the movable groove 123. That is, when the driving member 20 pushes the blade holder 30 to move, the corner portion and / or the fulcrum portion 33 of the blade holder 30 abuts against the upper rib 121 and the lower rib 122, allowing it to move in the movable groove 123. When the blade 40 abuts against the object to be cut, the blade holder 30 is able to rotate in the movable groove 123 about the fulcrum portion 33, so that the stop portion 32 engages with the engaging groove 124.

[0056] Further, as shown in Figure 9, the slot 124 includes a first slot 1241 and a second slot 1242. Several first slots 1241 are located at the front end of the upper rib 121 and are arranged along the extension direction of the upper rib 121. Several second slots 1242 are located at the rear end of the lower rib 122 and are arranged along the extension direction of the lower rib 122. The stop portion 32 includes a first stop portion 321 and a second stop portion 322. The first stop portion 321 is protrudingly provided at the front end of the upper side of the knife seat 30 and is suitable for being engaged with the first slot 1241. The second stop portion 322 is protrudingly provided at the rear end of the lower side of the knife seat 30 and is suitable for being engaged with the second slot 1242.

[0057] In some embodiments, as shown in Figure 8, the first elastic member 31 is a tension spring, the rear end of the knife seat 30 is provided with a first hook 37, and the lower shell 12 is protrudingly provided with a first hanging column 125. The first elastic member 31 is connected between the first hook 37 and the first hanging column 125, so as to provide the knife seat 30 with a force to retract back into the accommodating cavity 13, and at the same time provide torque to the knife seat 30, so that the knife seat 30 rotates to separate the stop portion 32 and the slot 124 on the knife shell 10.

[0058] Furthermore, an arc-shaped guide portion 128 is protrudingly provided on the inner wall of the lower housing 12. The guide portion 128 is located between the blade holder 30 and the first hanging post 125, and the first elastic member 31 is able to extend along the guide portion 128 from the first hook 37 to the first hanging post 125. It is understood that the guide portion 128 can support and guide the first elastic member 31, allowing the first elastic member 31 to stretch or contract along the guide portion 128. This helps prevent the first elastic member 31 from interfering with the drive member 20 or other structures in the blade housing 10 during the stretching or contracting process, allowing the blade holder 30 to move smoothly along the movable slot 123, thereby improving the reliability of the blade.

[0059] Specifically, as shown in Figures 13-15, when the driving member 20 pushes the knife seat 30 to move, the front end of the joint portion 23 abuts against the rear end of the guide portion 35, thereby pushing the knife seat 30 to move toward the front end of the knife housing 10, and the corner and / or fulcrum portion 33 at the upper rear end of the knife seat 30 abut against the upper rib 121, and the corner at the lower front end of the knife seat 30 abuts against the lower rib 122, that is, the first stop portion 321 located at the front end of the upper side of the knife seat 30 is disengaged from the upper rib 121, thereby avoiding interference between the first stop portion 321 and the plurality of first card grooves 1241, and the second stop portion 322 located at the rear end of the lower side of the knife seat 30 is disengaged from the lower rib 122, thereby avoiding interference between the second stop portion 322 and the plurality of second card grooves 1242, thereby allowing the knife seat 30 to move smoothly between the upper rib 121 and the lower rib 122.

[0060] During cutting, as shown in FIG16 , the blade 40 contacts the object to be cut, generating torque that causes the blade holder 30 to rotate about the fulcrum 33. The engaging portion 23 moves out of the engaging slot 36 from the upper opening of the engaging slot 36, separating the blade holder 30 from the driving member 20. Simultaneously, the corner portion at the upper rear end of the blade holder 30 disengages from the upper rib 121, and the corner portion at the lower front end of the blade holder 30 disengages from the lower rib 122. Furthermore, the first stop portion 321 abuts against the first engaging slot 1241, and the second stop portion 322 abuts against the second engaging slot 1242, securing the blade holder 30 to the blade housing 10. It can be understood that when the knife seat 30 is separated from the driving member 20, the first stop portion 321 located at the front end of the upper side of the knife seat 30 is combined with the first card slot 1241, and the second stop portion 322 located at the rear end of the lower side of the knife seat 30 is combined with the second card slot 1242, thereby overcoming the force of the first elastic member 31 on the knife seat 30, so that the knife seat 30 and the knife housing 10 are reliably fixed.

[0061] After the cutting operation is completed, as shown in Figure 15, the blade 40 is disengaged from the object to be cut, and the knife seat 30 rotates in the opposite direction under the action of the first elastic member 31, so that the first stop portion 321 is disengaged from the first slot 1241, and the second stop portion 322 is disengaged from the second slot 1242, and the corner and / or fulcrum portion 33 at the upper rear end of the knife seat 30 abuts against the upper rib 121, and the corner at the lower front end of the knife seat 30 abuts against the lower rib 122. At the same time, under the action of the first elastic member 31, the knife seat 30 is able to move toward the rear end along the movable groove 123, and at the same time, the engaging portion 23 of the driving member 20 moves along the upper surface of the guide portion 35 in the direction away from the engaging groove 36 until the stop portion 34 abuts against the inner wall of the knife housing 10, and the knife seat 30 and the blade 40 are able to retract into the accommodating cavity 13.

[0062] When the handle 50 is released, the driving member 20 and the handle 50 return to their initial positions under the action of the second elastic member 21. At the same time, the engaging portion 23 of the driving member 20 moves along the upper surface of the guide portion 35 toward the engaging groove 36 until it falls into the engaging groove 36, and the driving member 20 is engaged with the knife seat 30 again.

[0063] Furthermore, as shown in Figures 9 and 10, a number of slender first support ribs 126 are protrudingly provided between the upper ribs 121 and the lower ribs 122 of the lower shell 12, and the first support ribs 126 are against the back of the knife seat 30. The inner wall of the upper shell 11 is protrudingly provided with second support ribs 112, and the second support ribs 112 are against the front of the knife seat 30, so that the knife seat 30 can be clamped between the upper shell 11 and the lower shell 12, thereby preventing the knife seat 30 from shaking between the upper shell 11 and the lower shell 12 during cutting operations, thereby improving the stability of the knife seat 30, and helping to improve the safety and reliability of cutting with a tool.

[0064] In some embodiments, as shown in FIG10 , a slideway 111 is protruding from the inner wall of the upper shell 11 , and the driving member 20 abuts against the slideway 111 and moves along the slideway 111 within the accommodating chamber 13 . In a specific embodiment, the upper shell 11 is provided with two slideways 111 spaced apart and distributed front to back. The slideway 111 at the front end of the upper shell 11 supports the front end of the driving member 20 , and the slideway 111 at the rear end of the upper shell 11 supports the rear end of the driving member 20 , so that the driving member 20 can move back and forth within the accommodating chamber 13 under the control of the handle 50 .

[0065] It is worth mentioning that, as shown in Figures 12 to 14, an extension portion 26 is provided at the front end of the driving member 20, and a slide groove 261 is provided on the side of the extension portion 26 facing the lower shell 12. The slide groove 261 is suitable for cooperating with the upper rib 121, so that the driving member 20 moves along the upper rib 121, thereby further improving the reliability and stability of the driving member 20 moving along the lower shell 12.

[0066] Furthermore, a third support rib 127 is protrudingly provided on the inner wall of the lower shell 12, and the third support rib 127 abuts against the back of the driving member 20. The inner wall of the upper shell 11 is protrudingly provided with a fourth support rib 114, and the fourth support rib 114 and the slide 111 abut against the front of the driving member 20, so that the driving member 20 can be clamped between the upper shell 11 and the lower shell 12, avoiding the driving member 20 from shaking between the upper shell 11 and the lower shell 12 and generating abnormal noise, and at the same time helping to improve the reliability of the movement of the driving member 20 relative to the knife shell 10.

[0067] Furthermore, as shown in Figures 7-9, a longitudinally extending travel groove 1271 is defined on the third support rib 127. A stopper 27 is protruding from the rear end of the driver 20 toward the side of the lower housing 12. The stopper 27 is adapted to move within the travel groove 1271, allowing the driver 20 to move within the length of the travel groove 1271. Specifically, when the driver 20 is in the initial position, the stopper 27 abuts against the rear end wall of the travel groove 1271. When the handle 50 is pressed to move the driver 20 forward, the stopper 27 abuts against the front end wall of the travel groove 1271. Consequently, the cooperation between the stopper 27 and the travel groove 1271 allows the driver 20 to move within the length of the travel groove 1271, thereby limiting the maximum displacement of the driver 20 and the maximum rotation angle of the handle 50. This ensures that the tool holder 30 maintains an accurate and repeatable rest position when moving forward.

[0068] Furthermore, as shown in Figures 4 and 6 , the second elastic member 21 is a tension spring. A second hook 24 is provided at the rear end of the driver 20. A second hanging post 113 protrudes from the rear end of the upper housing 11. The second elastic member 21 is connected between the second hook 24 and the second hanging post 113, providing a force to return the driver 20 to its initial position. Furthermore, the driver 20 is provided with a longitudinally extending receiving groove 25 adapted to receive the second elastic member 21. Specifically, the second hanging column 113 is located at the front end of the accommodating groove 25, one end of the second elastic member 21 is hung on the second hook 24, and the second elastic member 21 is accommodated in the accommodating groove 25, extending along the accommodating groove 25 to the rear end of the knife housing 10, and the other end of the second elastic member 21 is hung on the second hanging column 113 located at the rear end of the knife housing 10. It can be understood that by opening the accommodating groove 25 on the driving member 20, the structure of the driving member 20 and the second elastic member 21 can be made more compact. At the same time, the second elastic member 21 is placed in the accommodating groove 25 to avoid the second elastic member 21 from interfering with other structures in the knife housing 10 when stretching or contracting, so that the driving member 20 moves smoothly in the knife housing 10, which is conducive to improving the reliability of the tool.

[0069] In some embodiments, as shown in Figures 8 and 11, a blade slot 38 and a magnetic slot 381 are provided on the front of the knife holder 30. The blade slot 38 is suitable for accommodating the blade 40, and the magnetic slot 381 is used to install a magnetic component. The magnetic component can adsorb the blade 40 so that the blade 40 fits against the wall of the blade slot 38, thereby improving the installation reliability of the blade 40 and the knife holder 30, avoiding the blade 40 from moving or shaking relative to the knife holder 30 during cutting operations, and improving the safety and reliability of the tool when in use.

[0070] Furthermore, as shown in Figures 4, 6 and 11, a mounting portion 39 is protruding from the front of the knife holder 30, and a limiting opening 41 is provided at the upper end of the blade 40. The mounting portion 39 is suitable for passing through the limiting opening 41 to fix the blade 40, so that the positioning of the blade 40 on the knife holder 30 is more accurate and easy to install.

[0071] In some embodiments, as shown in Figures 1 and 2, a tool changing panel 115 is installed at the front end of the upper shell 11. An elastic portion 1151 is provided on the tool changing panel 115. By pressing the elastic portion 1151, the tool changing panel 115 and the upper shell 11 can be separated to expose the blade 40, making it easier to replace the blade 40.

[0072] In some embodiments, as shown in Figures 3 and 4, the utility knife with automatically retracting blade 40 also includes a safety push button 60, which is slidably mounted on the rear end of the knife housing 10. The safety push button 60 is suitable for abutting against the inner end surface of the handle 50, so that the handle 50 remains in the initial position, avoiding accidental injury caused by the blade 40 extending from the port 14 due to accidental touching of the handle 50 when carrying or storing the knife, thereby further improving the safety of the knife.

[0073] The above describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and description merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A utility knife with an automatically retractable blade, characterized in that: include: A knife housing, wherein the knife housing is provided with a receiving cavity and a port, wherein the port is opened at the front end of the knife housing; a knife seat, the knife seat being used to carry a blade, the knife seat being movably mounted in the accommodating cavity, the knife seat being connected to the knife housing via a first elastic member, and a locking assembly being provided between the knife housing and the knife seat, so that the knife seat can be detachably fixed to the knife housing; a driving member, the driving member being movably mounted in the accommodating cavity and detachably connected to the knife holder to drive the knife holder to move; During operation, the knife holder rotates to separate from the driving member, and the knife holder is fixed to the knife housing through the locking assembly; when the operation is completed and the blade leaves the object to be cut, the locking assembly is unlocked under the action of the first elastic member, and the knife holder is able to move relative to the knife housing, so that the blade retracts into the accommodating cavity.

2. The utility knife with an automatically retractable blade according to claim 1, characterized in that: The driving member is connected to the blade housing via a second elastic member, one end of the driving member is detachably pressed against the blade seat, and the other end of the driving member is provided with a driving surface, and the driving surface is arranged at an angle to the moving direction of the driving member; The utility knife with an automatically retractable blade further comprises a handle, the handle being hingedly mounted on the knife housing, the handle being provided with a driving portion, the driving portion being in contact with the driving surface, so as to convert the rotation of the handle relative to the knife housing into the movement of the driving member relative to the knife housing; Among them, by pressing the handle, the driving part can push the blade holder to move, so that the blade is exposed from the port; by releasing the handle, the driving part and the handle can return to the initial position under the action of the second elastic part.

3. The utility knife with an automatically retractable blade according to claim 2, characterized in that: The locking assembly includes a slot located in the knife housing and a stop portion located in the knife seat, the slot is located on the inner wall of the front end of the knife housing, and the stop portion is protrudingly provided on the knife seat; during operation, the stop portion is suitable for engaging with the slot, so that the knife seat can be detachably fixed to the knife housing.

4. The utility knife with an automatically retractable blade according to claim 3, characterized in that: The knife seat is also provided with a fulcrum portion; during operation, the fulcrum portion abuts against the knife housing, and the knife seat is able to rotate around the fulcrum portion, so that the knife seat is separated from the driving member and the stop portion is engaged with the slot.

5. The utility knife with an automatically retractable blade according to claim 3, characterized in that: The knife seat and the driving member are stacked, and a stop portion and a guide portion are provided at intervals on the rear end of the knife seat, and the stop portion and the guide portion protrude from the knife seat toward the side where the driving member is located; when the knife seat is retracted into the accommodating cavity, the stop portion is adapted to abut against the knife housing, and the upper surface of the guide portion is inclined along the longitudinal direction of the knife housing, and an engagement groove is formed between the stop portion and the guide portion; The front end of the driving member is provided with a coupling portion protruding toward the side where the knife holder is located, and the coupling portion is suitable for sliding along the upper surface of the guide portion so that the coupling portion is combined with or separated from the coupling groove; when the coupling portion is accommodated in the coupling groove, the coupling portion is able to abut against the rear end surface of the guide portion to push the knife holder to move.

6. The utility knife with an automatically retractable blade according to claim 4, characterized in that: The knife housing includes an upper shell and a lower shell, and the knife seat and the driving member are accommodated in the accommodating cavity between the upper shell and the lower shell; the inner wall of the lower shell is protrudingly provided with slender upper ribs and lower ribs, and a movable groove is formed between the upper ribs and the lower ribs, and the knife seat is suitable for translation and / or rotation along the movable groove; the inner wall of the upper shell is protrudingly provided with a slide, and the driving member abuts against the slide, so as to be able to move along the slide in the accommodating cavity.

7. The utility knife with an automatically retractable blade according to claim 6, characterized in that: The card slot includes a first card slot and a second card slot, and several of the first card slots are located at the front end of the upper rib and are arranged along the extension direction of the upper rib; several of the second card slots are located at the rear end of the lower rib and are arranged along the extension direction of the lower rib; the stop portion includes a first stop portion and a second stop portion, and the first stop portion is protrudingly provided at the front end of the upper side of the knife seat, suitable for being engaged with the first card slot, and the second stop portion is protrudingly provided at the rear end of the lower side of the knife seat, suitable for being engaged with the second card slot.

8. The utility knife with an automatically retractable blade according to claim 7, characterized in that: A first hook is provided at the rear end of the knife holder, and a first hanging column is protruding from the lower shell. The first elastic member is connected between the first hook and the first hanging column, so as to provide a force for the knife holder to retract back into the accommodating cavity, and at the same time provide a torque to the knife holder so that the knife holder rotates to separate the stop portion and the slot on the knife shell.

9. The utility knife with an automatically retractable blade according to claim 8, characterized in that: A plurality of slender first support ribs are protrudingly provided between the upper ribs and the lower ribs of the lower shell, and the first support ribs are against the back of the knife holder. The inner wall of the upper shell is protrudingly provided with second support ribs, and the second support ribs are against the front of the knife holder, so that the knife holder can be clamped between the upper shell and the lower shell.

10. The utility knife with an automatically retractable blade according to claim 9, characterized in that: A second hook is provided at the rear end of the driving member, a second hanging column is protruding from the rear end of the upper shell, and the second elastic member is connected between the second hook and the second hanging column to provide a force for the driving member to return to its initial position; The driving member is further provided with a longitudinally extending receiving groove, the receiving groove being suitable for receiving the second elastic member, and the second hook is located at the front end of the receiving groove; An extension portion is provided at the front end of the driving member, and a slide groove is provided on a side of the extension portion facing the lower shell, wherein the slide groove is adapted to cooperate with the upper rib so that the driving member moves along the upper rib; A third supporting rib is protrudingly provided on the inner wall of the lower shell, and the third supporting rib abuts against the back surface of the driving member. A fourth supporting rib is protrudingly provided on the inner wall of the upper shell, and the fourth supporting rib and the slide abut against the front surface of the driving member, so as to clamp the driving member between the upper shell and the lower shell. A longitudinally extending travel groove is formed on the third supporting rib, and a stop portion is protruded from a rear end of the driving member toward one side of the lower shell, the stop portion being adapted to move in the travel groove so as to enable the driving member to move within the length of the travel groove; An arc-shaped guide portion is protrudingly provided on the inner wall of the lower shell, and the guide portion is located between the knife seat and the first hanging column, and the first elastic member is able to extend from the first hook to the first hanging column along the guide portion; The front of the blade holder is provided with a blade slot and a magnetic slot, wherein the blade slot is suitable for accommodating a blade, and the magnetic slot is used for installing a magnetic member, and the magnetic member is capable of adsorbing the blade; The front side of the blade holder is also provided with a protruding mounting portion, and the upper end of the blade is provided with a limiting opening, and the mounting portion is adapted to pass through the limiting opening to fix the blade; A limiting boss is protruding from the side of the handle. When the handle is in the initial position, the limiting boss abuts against the inner wall of the knife housing, so that at least a portion of the handle is retained in the accommodating cavity. A blade changing panel is installed at the front end of the upper shell. An elastic portion is provided on the blade changing panel. By pressing the elastic portion, the blade changing panel and the upper shell can be separated to expose the blade. The utility knife with automatically retracting blade further comprises a rotating wheel, which is rotatably mounted on the driving portion of the handle. The rotating wheel abuts against the driving surface of the driving member; The utility knife with automatically retracting blade further comprises a safety push button which is slidably mounted on the rear end of the knife housing and adapted to abut against the inner end surface of the handle so that the handle remains in an initial position.

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