Art knife capable of automatically retracting blade

Abstract

The utility knife capable of automatically retracting the blade comprises a knife shell provided with a containing cavity and an end opening, and the end opening is formed in the front end of the knife shell; the knife holder is used for bearing the blade, the knife holder is movably installed in the containing cavity, and the knife holder is connected with the knife shell through a first elastic piece; the driving piece is movably installed in the containing cavity so as to drive the tool apron to move, and the tool apron is connected with the tool shell through a second elastic piece; the elastic piece is elastically deformed, one end of the elastic piece is connected to one of the tool apron and the driving piece, and the other end of the elastic piece abuts against the other one of the tool apron and the driving piece; when the driving piece drives the tool apron to move towards the port, the elastic piece abuts against the position between the driving piece and the tool apron, and the elastic piece is extruded to deform so as to store elastic potential energy. During operation, the tool apron rotates and / or moves forwards relative to the driving piece, the elastic piece is separated from one of the tool apron and the driving piece, and elastic potential energy is released; when the blade leaves the to-be-cut object, the tool apron retracts into the containing cavity under the action of the first elastic piece.

Description

Technical Field

[0001] This utility model relates to the field of cutting tool technology, specifically, to a utility knife with an automatically retractable blade. Background Technology

[0002] A utility knife is a common art and craft tool, mainly used to cut materials such as paper, cardboard, or leather. Utility knives are mostly pull-out type, consisting of a blade and a cover. A push button moves the blade longitudinally along the axis of the cover.

[0003] To prevent injury from blades not retracting into the casing after cutting, some utility knives have an automatic blade retraction function. This means that by pressing the handle, the blade extends out of the casing, and when finished using the knife, releasing the handle causes the blade to automatically retract into the casing.

[0004] However, if the user subconsciously continues to grip the handle when stopping work, causing the blade to fail to retract into the casing, the user may easily injure themselves or others by swinging the utility knife. Utility Model Content

[0005] One objective of this invention is to provide a utility knife with an automatically retractable blade. During cutting, the blade holder rotates and / or moves forward relative to the driving component, allowing the spring to disengage from either the blade holder or the driving component and release elastic potential energy. After cutting, as the blade leaves the object being cut, the blade holder retracts into the receiving cavity via a first elastic element. This means the blade can be retracted into the receiving cavity without requiring operation of the driving component, thus preventing accidental injury.

[0006] Another objective of this utility model is to provide a utility knife with an automatically retractable blade, which uses a handle to control a drive mechanism, thereby converting the rotation of the handle relative to the blade housing into movement of the drive mechanism relative to the blade housing, making it easier to operate.

[0007] Another objective of this utility model is to provide a utility knife with an automatically retractable blade. When the driving component drives the blade holder to move toward the port, the spring is compressed and deformed to store elastic potential energy. During the cutting operation, the spring releases the elastic potential energy and returns to its original shape, which can separate the blade holder from the driving component. Thus, after the cutting operation is completed, the blade can automatically retract. The structure is simple and does not require the addition of complex accessories.

[0008] Another objective of this invention is to provide a utility knife with an automatically retractable blade. By rotating the blade holder or moving it forward relative to the drive component, the blade holder can be separated from the drive component, which is beneficial for automatically retracting the blade when cutting objects at heights.

[0009] Another objective of this utility model is to provide a utility knife with an automatically retractable blade. When the driving component drives the blade holder to move towards the port, the blade holder can abut against the stop part, which helps to prevent the blade from accidentally retracting due to the blade holder moving forward relative to the driving component due to inertia.

[0010] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a utility knife with an automatically retractable blade, comprising: a blade shell, the blade shell having a receiving cavity and a port, the port being located at the front end of the blade shell; a blade holder, the blade holder for supporting the blade, the blade holder being movably installed in the receiving cavity, the blade holder being connected to the blade shell via a first elastic member; a driving member, the driving member being movably installed in the receiving cavity to drive the blade holder to move, the blade holder being connected to the blade shell via a second elastic member; and a spring sheet, the spring sheet being elastically deformable, one end of the spring sheet being connected to the blade holder or the receiving cavity. One of the driving components, the other end of the spring abuts against the blade holder or the other of the driving components; wherein, when the driving component drives the blade holder to move toward the port, the spring abuts between the driving component and the blade holder, and the spring is compressed and deformed to store elastic potential energy; during the cutting operation, the blade holder rotates and / or moves forward relative to the driving component, allowing the spring to disengage from the blade holder or the driving component and release the elastic potential energy to return to its original shape; when the operation ends and the blade leaves the object to be cut, the blade holder retracts into the receiving cavity under the action of the first elastic element.

[0011] As a preferred embodiment, the front end of the blade housing is provided with a protruding stop portion, which is located on the inner wall of the blade housing opposite to the blade edge. When the driving member drives the blade holder to move toward the port, the blade holder can abut against the stop portion.

[0012] As a preferred embodiment, the spring is connected to the upper side of the tool holder, and the spring extends toward the driving member; the front end of the driving member has a groove with an opening facing the spring, and when the driving member drives the tool holder to move toward the port, the spring abuts against the groove wall; when the tool holder rotates and / or moves forward relative to the driving member, the spring disengages from the groove.

[0013] As a preferred embodiment, the upper side of the tool holder is provided with a mounting groove; the spring includes a main body and a mounting part, the main body can deformably abut against the driving member, and the mounting part can fit into the mounting groove so that the spring can be detachably connected to the tool holder.

[0014] As a preferred embodiment, the blade housing includes an upper shell and a lower shell, with the receiving cavity formed between the upper shell and the lower shell; the lower shell has a movable groove, the movable groove including a main support section and an expansion section, the main support section extending in a straight line, allowing the blade holder to translate along the main support section toward the port, the expansion section being located at the end of the main support section near the port, the expansion section extending outward away from the side where the blade is located, allowing the blade holder to translate and / or rotate along the expansion section.

[0015] As a preferred embodiment, the tool holder is provided with at least two rollers on the side facing the lower housing, the rollers being able to roll within the movable groove to allow the tool holder to translate and / or rotate along the movable groove.

[0016] As a preferred embodiment, the blade housing includes an upper shell and a lower shell, with the receiving cavity formed between the upper shell and the lower shell; the inner wall of the upper shell has a first slide rail and a second slide rail that are staggered; the driving member has a first guide post adapted to the first slide rail and a second guide post adapted to the second slide rail on the side facing the upper shell, so that the driving member can move along the first slide rail and the second slide rail; wherein, the first slide rail extends in a straight line, and at least a portion of the second slide rail extends in an arc, so that when the driving member moves toward the port, the front end of the driving member rotates toward the blade holder, thereby compressing the spring sheet.

[0017] As a preferred embodiment, the inner wall of the lower shell has a third slide rail disposed opposite to the first slide rail, and the extension direction of the third slide rail is consistent with the extension direction of the first slide rail; the driving member has a third guide post adapted to the third slide rail on the side facing the lower shell, so that the driving member moves along the third slide rail.

[0018] As a preferred embodiment, the rear end of the blade holder is provided with a first hook, the blade shell is provided with a first hanging post protruding from it, and the first elastic element is connected between the first hook and the first hanging post, so as to provide the blade holder with a force to retract back into the receiving cavity; the rear end of the drive member is provided with a second hook, the rear end of the blade shell is provided with a second hanging post protruding from it, and the second elastic element is connected between the second hook and the second hanging post, so as to provide the drive member with a force to return to the initial position.

[0019] As a preferred embodiment, the drive member has a drive surface at one end away from the blade holder, and the drive surface is set at an angle to the moving direction of the drive member; the utility knife with automatic retractable blade also includes a handle, the handle is hinged to the blade shell, the handle is provided with a drive part, and the drive part abuts against the drive surface, so as to convert the rotation of the handle relative to the blade shell into the movement of the drive member relative to the blade shell. Attached Figure Description

[0020] Figure 1 This is an internal structural diagram of a utility knife in the blade retracted receiving cavity state according to some embodiments of this application.

[0021] Figure 2 This is an internal structural diagram of a utility knife in the blade retracted receiving cavity state according to some embodiments of this application.

[0022] Figure 3 This is an internal structural diagram of a utility knife with the blade extended, according to some embodiments of this application.

[0023] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0024] Figure 5 This is an internal structural diagram of a utility knife with the blade extended, according to some embodiments of this application.

[0025] Figure 6 This is an internal structural diagram of a utility knife in a cutting operation state according to some embodiments of this application.

[0026] Figure 7 yes Figure 6 Enlarged view of point B in the middle.

[0027] Figure 8 This is an internal structural diagram of a utility knife in a cutting operation state according to some embodiments of this application.

[0028] Figure 9 This is a structural diagram of the upper shell of a utility knife according to some embodiments of this application.

[0029] Figure 10 This is a structural diagram of the lower shell of a utility knife according to some embodiments of this application.

[0030] Figure 11 This is a structural diagram of the spring of a utility knife according to some embodiments of this application.

[0031] Figure 12 This is a structural diagram of the blade holder of a utility knife according to some embodiments of this application.

[0032] Figure 13 This is a structural diagram of the drive component of a utility knife according to some embodiments of this application.

[0033] Figure 14 This is a structural diagram of the drive component of a utility knife according to some embodiments of this application.

[0034] In the diagram: 10. Blade housing; 11. Upper shell; 111. First slide rail; 112. Second slide rail; 113. Second hanging post; 12. Lower shell; 121. Movable groove; 1211. Main support section; 1212. Expansion section; 122. Third slide rail; 123. First hanging post; 13. Receiving cavity; 14. Port; 15. Stop; 20. Driving component; 21. Groove; 22. Joint; 23. Driving surface; 24. First guide post; 25. Second guide post; 26. Third guide post; 27. Second hook; 30. Blade holder; 31. Mounting groove; 32. First hook; 33. Roller; 41. First elastic element; 42. Second elastic element; 50. Blade; 60. Spring; 61. Main body; 62. Mounting part; 70. Handle; 71. Driving part. Detailed Implementation

[0035] The present invention will be further described below with reference to 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.

[0036] In the description of this utility model, it should be noted that the 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" are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model.

[0037] 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.

[0038] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0039] A utility knife with an automatically retractable blade, such as Figures 1-14As shown, the device includes: a blade housing 10, a blade holder 30, a drive member 20, and a spring 60. The blade housing 10 has 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 the blade 50 and is movably installed within the receiving cavity 13. The blade holder 30 is connected to the blade housing 10 via a first elastic member 41. The drive member 20 is movably installed within the receiving cavity 13 to drive the blade holder 30 to move. The blade holder 30 is connected to the blade housing 10 via a second elastic member 42. The spring 60 is elastically deformable, with one end connected to either the blade holder 30 or the drive member 20, and the other end abutting against the other of the blade holder 30 or the drive member 20.

[0040] When the driving component 20 drives the tool holder 30 to move toward the port 14, such as Figure 3 and Figure 5 As shown, the spring 60 abuts between the drive member 20 and the blade holder 30, thereby allowing the drive member 20 to push the blade holder 30 to move via the spring 60, causing the blade 50 to extend from the port 14, and the spring 60 to be compressed and deformed to store elastic potential energy. During the cutting operation, as... Figure 6 and Figure 8 As shown, the torque generated by the blade 50 against the object to be cut causes the blade holder 30 to rotate, or the frictional resistance between the blade 50 and the object to be cut causes the blade holder 30 to move forward relative to the drive member 20. Through the rotation of the blade holder 30 and / or its forward movement relative to the drive member 20, the spring 60 disengages from either the blade holder 30 or the drive member 20, releasing its elastic potential energy and returning to its original shape. In other words, the blade holder 30 disengages from the drive member 20. When the operation ends and the blade 50 leaves the object to be cut, the blade holder 30 retracts into the receiving cavity 13 under the action of the first elastic member 41, which helps to prevent the blade 50 from being exposed in the blade housing 10 and causing accidental injury to the user.

[0041] It is worth mentioning that when the driving component 20 drives the blade holder 30 to move toward the port 14, the spring 60 is compressed and deformed to store elastic potential energy. During the cutting operation, the spring 60 releases the elastic potential energy and returns to its original shape, which can separate the blade holder 30 from the driving component 20. Thus, after the cutting operation is completed, the blade 50 can automatically retract. In other words, the automatic retraction of the blade 50 can be achieved through the elastic deformation of the spring 60. The structure is simple and does not require the addition of complex parts, which helps to reduce the manufacturing difficulty of utility knives and reduce production costs.

[0042] In some embodiments, such as Figure 4As shown, the front end of the blade housing 10 is provided with a protruding stop 15. The stop 15 is located on the inner wall of the blade housing 10 opposite to the blade. When the driving member 20 drives the blade holder 30 to move towards the port 14, the blade holder 30 abuts against the stop 15. That is to say, when the driving member 20 stops moving, the stop 15 abuts against the blade holder 30, which helps to prevent the blade holder 30 from continuing to move forward relative to the driving member 20 under the action of inertia. This helps to prevent the blade holder 30 from separating from the driving member 20 and causing the blade 50 to retract unexpectedly, thereby improving the safety and operability of the utility knife during use.

[0043] In some embodiments, such as Figure 5 , Figures 11-13 As shown, the spring piece 60 is connected to the upper side of the tool holder 30, and extends towards the driving member 20. The front end of the driving member 20 has a groove 21 with an opening facing the spring piece 60. When the driving member 20 drives the tool holder 30 to move towards the port 14, the spring piece 60 abuts against the groove wall of the groove 21, and the driving member 20 pushes the tool holder 30 to move through the spring piece 60, so that the blade 50 extends from the port 14. At the same time, the spring piece 60 is compressed and deformed to store elastic potential energy. Figure 8 As shown, when the tool holder 30 rotates and / or moves forward relative to the drive member 20, the spring 60 is able to disengage from the groove 21, and at the same time release its elastic properties, the spring 60 returns to its original shape, so that the tool holder 30 and the drive member 20 are separated.

[0044] According to the application understanding, the groove 21 improves the reliability of the spring 60 abutting against the drive member 20, and the groove 21 also guides the spring 60. In at least one embodiment, such as Figure 5 As shown, when the driving member 20 drives the tool holder 30 to move towards the port 14, the end of the spring piece 60 that abuts against the groove wall of the groove 21 bends upward, so that the spring piece 60 deforms to store elastic potential energy. Figure 8 As shown, when the tool holder 30 rotates and / or moves forward relative to the drive member 20, the spring 60 releases its elastic properties, and the end of the spring 60 that abuts against the groove wall of the groove 21 can slide downward along the groove wall, which is conducive to the spring 60 smoothly returning to its original shape.

[0045] In at least one embodiment, such as Figure 5 and Figure 13 As shown, the front end of the drive member 20 is provided with a joint 22 protruding towards the side where the tool holder 30 is located. At least part of the joint 22 is located behind the spring piece 60 to form a groove 21. At least part of the joint is located above the spring piece 60, so as to play an auxiliary limiting role for the spring piece 60 and help prevent the spring piece 60 from warping.

[0046] In some embodiments, such as Figure 11 and Figure 12As shown, a mounting groove 31 is provided on the upper side of the blade holder 30; the spring piece 60 includes a main body 61 and a mounting part 62. The main body 61 can deformably abut against the drive member 20, and the mounting part 62 can be engaged with the mounting groove 31, so that the spring piece 60 is detachably connected to the blade holder 30. It should be understood that the spring piece 60 can be made of metal to reduce the risk of breakage when the spring piece 60 is deformed, thereby improving the structural reliability of the utility knife and extending its service life. The blade holder 30 can be made of plastic to reduce the production cost of the utility knife. Furthermore, the blade holder 30 and the spring piece 60 are engaged by the mounting part 62 and the mounting groove 31, which reduces the assembly difficulty of the utility knife and improves production efficiency.

[0047] In some embodiments, such as Figure 1 and Figure 2 As shown, the blade casing 10 includes an upper casing 11 and a lower casing 12, with a receiving cavity 13 formed between the upper casing 11 and the lower casing 12. Further, as... Figure 10 As shown, the lower shell 12 has a movable groove 121, which includes a main support section 1211 and an expansion section 1212. The main support section 1211 extends in a straight line, allowing the tool holder 30 to translate along the main support section 1211 toward the port 14. The expansion section 1212 is located at the end of the main support section 1211 near the port 14, and extends outward away from the side where the cutting edge is located, so that the tool holder 30 translates and / or rotates along the expansion section 1212.

[0048] In other words, when the driving element 20 drives the tool holder 30 to move toward the port 14, such as Figure 3 As shown, the blade holder 30 can translate along the main support section 1211, allowing the blade 50 to smoothly extend from the port 14, which helps avoid safety hazards caused by the rotation of the blade 50. During cutting operations, if... Figure 6 As shown, the tool holder 30 can rotate through the expansion section 1212 and / or move forward relative to the drive member 20, thereby allowing the spring piece 60 to disengage from the groove 21 of the drive member 20 and release elastic potential energy to return to its original state.

[0049] In some embodiments, such as Figure 5 and Figure 12 As shown, the blade holder 30 has at least two rollers 33 on the side facing the lower housing 12. The rollers 33 can roll within the movable groove 121 to allow the blade holder 30 to translate and / or rotate along the movable groove 121. It should be understood that the rollers 33 reduce the frictional resistance between the blade holder 30 and the groove wall of the movable groove 121, making the blade holder 30 move more stably and smoothly within the receiving cavity 13, thereby improving the operability of the utility knife; it also reduces wear between the blade holder 30 and the blade housing 10, thereby extending the service life of the utility knife.

[0050] In at least one embodiment, the blade holder 30 is provided with two rollers 33 on the side facing the lower housing 12. When the drive member 20 drives the blade holder 30 to move toward the port 14, both rollers 33 are located within the main support section 1211, so that the blade 50 extends smoothly out of the port 14. When the drive member 20 stops moving and the blade holder 30 and the stop part 15 abut against each other, the roller 33 on the side of the blade holder 30 away from the port 14 is still located within the main support section 1211, while the roller 33 on the side of the blade holder 30 near the port 14 is located at the junction of the main support section 1211 and the expansion section 1212 or within the expansion section 1212. Thus, during the cutting operation, the roller 33 on the side of the blade holder 30 near the port 14 can move within the expansion section 1212, causing the blade holder 30 to rotate and / or move forward relative to the drive member 20.

[0051] In some embodiments, such as Figure 9 , Figure 13 and Figure 14 As shown, the inner wall of the upper shell 11 has a first slide rail 111 and a second slide rail 112 that are staggered. The driving member 20 has a first guide post 24 adapted to the first slide rail 111 and a second guide post 25 adapted to the second slide rail 112 on the side facing the upper shell 11, so that the driving member 20 can move along the first slide rail 111 and the second slide rail 112. Wherein, as... Figure 9 As shown, the first slide 111 extends in a straight line, and at least part of the second slide 112 extends in an arc, so that when the drive member 20 moves toward the port 14, the front end of the drive member 20 rotates toward the direction of the knife holder 30, thereby squeezing the spring 60, and thus causing the spring 60 to deform to store elastic potential energy.

[0052] In some embodiments, the inner wall of the lower shell 12 has a third slide 122 disposed opposite to the first slide 111, and the extending direction of the third slide 122 is consistent with the extending direction of the first slide 111; a third guide post 26 adapted to the third slide 122 is provided on the side of the drive member 20 facing the lower shell 12, so that the drive member 20 can move along the third slide 122. It should be understood that through the cooperation of the third slide 122 and the first slide 111, the drive member 20 can be clamped between the upper shell 11 and the lower shell 12, enabling the drive member 20 to move more stably and smoothly in the receiving cavity 13, thereby improving the structural reliability and operability of the utility knife.

[0053] In some embodiments, such as Figure 10 and Figure 12 As shown, the rear end of the blade holder 30 is provided with a first hook 32, the blade shell 10 is provided with a first hanging post 123 protrudingly, and the first elastic element 41 is connected between the first hook 32 and the first hanging post 123, so as to provide the blade holder 30 with a force to retract back into the receiving cavity 13.

[0054] Furthermore, such as Figure 11 and Figure 14 As shown, the rear end of the drive member 20 is provided with a second hook 27, and the rear end of the blade shell 10 is provided with a second hanging post 113 protrudingly. The second elastic member 42 is connected between the second hook 27 and the second hanging post 113, so as to provide the drive member 20 with a force to return to the initial position.

[0055] In some embodiments, such as Figure 8 As shown, the drive member 20 has a drive surface 23 at one end away from the blade holder 30, and the drive surface 23 is set at an angle to the moving direction of the drive member 20. The utility knife with automatic retractable blade 50 also includes a handle 70, which is hinged to the blade housing 10. The handle 70 has a drive part 71, which abuts against the drive surface 23, so that the rotation of the handle 70 relative to the blade housing 10 is converted into the movement of the drive member 20 relative to the blade housing 10. That is, by pressing the handle 70, the drive part 71 can push the blade holder 30 to move, so that the blade 50 is exposed from the port 14; when the handle 70 is released, the drive member 20 and the handle 70 can return to their initial positions under the action of the second elastic member 42.

[0056] The working principle of the self-retracting blade 50 utility knife is as follows:

[0057] like Figures 3-5 As shown, the user presses the handle 70 to cause the drive member 20 to push the blade holder 30 towards the port 14. During this movement, due to the coordinated action of the first slide rail 111 and the second slide rail 112, the front end of the drive member 20 rotates towards the blade holder 30, compressing the spring 60. This causes the end of the spring 60 against the groove wall of the groove 21 to warp upwards, deforming to store elastic potential energy. The two rollers 33 of the blade holder 30 move within the main support section 1211 to ensure the blade 50 extends smoothly out of the port 14. When the drive member 20 stops moving, the blade holder 30 and the stop 15 abut against each other, thus preventing the blade holder 30 from continuing to move forward relative to the drive member 20 under inertia, which could cause the spring 60 to detach from the groove 21, reducing the risk of the blade 50 accidentally retracting.

[0058] like Figures 6-8 As shown, during the cutting operation, the blade 50 generates torque by resisting the object to be cut, causing the blade holder 30 to rotate, or the frictional resistance between the blade 50 and the object to be cut causes the blade holder 30 to move forward relative to the drive member 20, thereby allowing the spring 60 to disengage from the groove 21 of the drive member 20, releasing elastic potential energy and returning to its original shape. It should be understood that at this time, the end of the spring 60 near the drive member 20 is misaligned with the groove 21, such as... Figure 8 As shown.

[0059] It is worth mentioning that when the utility knife is cutting objects such as paper and boards placed on a table, the user can press down on the utility knife to provide sufficient torque to the blade holder 30, causing the blade holder 30 to rotate at a large angle. This allows the spring 60 to disengage from the groove 21, enabling the blade 50 to retract automatically. When cutting objects located at heights, such as wires and pipes, it is more difficult for the user to apply force, making it difficult to provide sufficient torque to the blade holder 30 to generate a large rotation angle. However, the force between the object to be cut and the blade 50 during cutting can still cause the blade holder 30 to rotate at a small angle, causing the blade holder 30 to be misaligned from the stop part 15. Furthermore, through the friction between the object to be cut and the blade 50, the blade holder 30 can move further forward relative to the drive member 20, allowing the spring 60 to disengage from the groove 21, thus enabling the blade 50 to retract automatically.

[0060] When the cutting operation is completed and the blade 50 leaves the object to be cut, the blade holder 30 retracts into the receiving cavity 13 under the action of the first elastic member 41, thereby preventing the blade 50 from being exposed on the blade shell 10 and causing accidental injury to the human body. It should be understood that since the spring piece 60 is already misaligned with the groove 21 of the drive member 20 during the cutting operation, the spring piece 60 will no longer abut against the drive member 20 during the process of the blade holder 30 retracting into the receiving cavity 13. That is, the drive member 20 will not interfere with the movement of the blade holder 30, and thus the blade holder 30 can smoothly retract into the receiving cavity 13.

[0061] like Figure 1 and Figure 2 As shown, when the user releases the handle 70, the drive member 20 and the handle 70 return to their initial positions under the action of the second elastic member 42, and the end of the spring piece 60 near the drive member 20 can abut against the groove wall of the groove 21 again, or be set opposite to the groove 21.

[0062] The basic principles, main features, and advantages of this utility model have been described above. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A utility knife with an automatically retractable blade, characterized in that, include: A blade housing, wherein the blade housing has a receiving cavity and a port, the port being located at the front end of the blade housing; A blade holder for carrying a blade, the blade holder being movably mounted within the receiving cavity, the blade holder being connected to the blade housing via a first elastic element; A driving member is movably mounted within the receiving cavity to drive the tool holder to move, the tool holder being connected to the tool housing via a second elastic member; A spring sheet, which is elastically deformable, with one end of the spring sheet connected to one of the tool holder or the driving member, and the other end of the spring sheet abutting against the other of the tool holder or the driving member; When the driving member drives the blade holder to move toward the port, the spring sheet abuts between the driving member and the blade holder, and the spring sheet is compressed and deformed to store elastic potential energy; during the cutting operation, the blade holder rotates and / or moves forward relative to the driving member, allowing the spring sheet to disengage from either the blade holder or the driving member and release the elastic potential energy to return to its original shape; when the operation ends and the blade leaves the object to be cut, the blade holder retracts into the receiving cavity under the action of the first elastic member.

2. The utility knife with an automatically retractable blade according to claim 1, characterized in that, The front end of the blade housing is provided with a protruding stop portion, which is located on the inner wall of the blade housing opposite to the blade. When the driving member drives the blade holder to move toward the port, the blade holder can abut against the stop portion.

3. The utility knife with an automatically retractable blade according to claim 1, characterized in that, The spring is connected to the upper side of the tool holder and extends toward the driving member; the front end of the driving member has a groove with an opening facing the spring, and when the driving member drives the tool holder to move toward the port, the spring abuts against the groove wall; when the tool holder rotates and / or moves forward relative to the driving member, the spring disengages from the groove.

4. The utility knife with an automatically retractable blade according to claim 3, characterized in that, The upper side of the tool holder is provided with a mounting groove; the spring includes a main body and a mounting part, the main body can deformably abut against the driving member, and the mounting part can fit into the mounting groove so that the spring can be detachably connected to the tool holder.

5. The utility knife with an automatically retractable blade according to claim 1, characterized in that, The blade housing includes an upper shell and a lower shell, with the receiving cavity formed between the upper shell and the lower shell; the lower shell has a movable groove, the movable groove including a main support section and an expansion section, the main support section extending in a straight line, allowing the blade holder to translate along the main support section toward the port, the expansion section located at the end of the main support section near the port, the expansion section extending outward away from the side where the blade is located, allowing the blade holder to translate and / or rotate along the expansion section.

6. The utility knife with an automatically retractable blade according to claim 5, characterized in that, The tool holder is provided with at least two rollers on the side facing the lower housing. The rollers can roll in the movable groove to allow the tool holder to translate and / or rotate along the movable groove.

7. The utility knife with an automatically retractable blade according to claim 1, characterized in that, The blade housing includes an upper shell and a lower shell, and the receiving cavity is formed between the upper shell and the lower shell; the inner wall of the upper shell has a first slide and a second slide that are staggered; the driving member is provided with a first guide post adapted to the first slide and a second guide post adapted to the second slide on the side facing the upper shell, so that the driving member can move along the first slide and the second slide. The first slide extends in a straight line, and at least a portion of the second slide extends in an arc, so that when the drive member moves toward the port, the front end of the drive member rotates toward the blade holder to compress the spring.

8. The utility knife with an automatically retractable blade according to claim 7, characterized in that, The inner wall of the lower shell has a third slide rail that is opposite to the first slide rail, and the extension direction of the third slide rail is consistent with the extension direction of the first slide rail; the drive member has a third guide post adapted to the third slide rail on the side facing the lower shell, so that the drive member can move along the third slide rail.

9. The utility knife with an automatically retractable blade according to any one of claims 1-8, characterized in that, The rear end of the blade holder is provided with a first hook, and the blade shell is provided with a first hanging post protruding from it. The first elastic element is connected between the first hook and the first hanging post, so as to provide the blade holder with a force to retract back into the receiving cavity. The drive component has a second hook at its rear end, and the blade housing has a second hanging post protruding from its rear end. The second elastic element is connected between the second hook and the second hanging post, thereby providing the drive component with a force to return to its initial position.

10. The utility knife with an automatically retractable blade according to any one of claims 1-8, characterized in that, The driving member has a driving surface at one end away from the tool holder, and the driving surface is set at an angle to the moving direction of the driving member; The utility knife with an automatic retractable blade also includes a handle, which is hinged to the blade housing. The handle is provided with a drive unit, which abuts against the drive surface to convert the rotation of the handle relative to the blade housing into the movement of the drive unit relative to the blade housing.

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