A utility knife with an automatically retractable blade

Abstract

The present application discloses a utility knife with an automatically retractable blade, comprising: a knife shell, which is provided with a receiving cavity and a port, and the port is opened at the front end of the knife shell; a knife holder for carrying the blade, the knife holder is movably installed in the receiving cavity, the knife holder is connected to the knife shell through a first elastic member, and a locking component is arranged between the knife shell and the knife holder, so that the knife holder can be detachably fixed to the knife shell; a driving member, which is movably installed in the receiving cavity, and the driving member is detachably connected to the knife holder to drive the knife holder to move; wherein, during operation, the knife holder rotates to be separated from the driving member, and the knife holder is fixed to the knife shell through the locking component; when the operation is completed and the blade leaves the object to be cut, the locking component is unlocked under the action of the first elastic member, and the knife holder can move relative to the knife shell, so that the blade retracts into the receiving cavity, avoiding accidental injury.

Description

Technical Field

[0001] The present invention relates to the technical field of cutting tools, and more specifically, to a utility knife with an automatically retractable blade. Background Art

[0002] A utility knife is a commonly used art and handicraft tool, mainly used for cutting materials such as paper, cardboard or leather. Most utility knives are of a pull-out structure, consisting of a knife shell and a blade, and the blade can be driven to move longitudinally along the axis of the knife shell by a push button.

[0003] In order to prevent the blade from hurting people when it is not retracted into the knife shell in time after cutting an object, some utility knives have the function of automatically retracting the blade, that is, by pressing the handle, the blade extends out of the shell, and after the use is over, when the handle is released, the blade automatically retracts into the body.

[0004] However, if the user still subconsciously pinches the handle when stopping the operation, causing the blade not to retract into the knife shell, at this time, if the user waves the utility knife, it is easy to hurt himself or others. Summary of the Invention

[0005] An object of the present invention is to provide a utility knife with an automatically retractable blade, the knife holder of which can be separated from the driving member by rotation and fixed to the knife shell through a locking assembly, which is convenient for cutting operations. After the cutting operation is over, when the blade leaves the cutting object, the knife holder can be retracted into the receiving cavity through a first elastic member, and the driving member does not need to be operated to retract the knife holder into the receiving cavity, thus avoiding accidental injuries.

[0006] Another object of the present invention is to provide a utility knife with an automatically retractable blade, which controls the driving member through a handle, and can convert the rotation of the handle relative to the knife shell into the movement of the driving member relative to the knife shell, which is convenient for operation.

[0007] Another object of the present invention is to provide a utility knife with an automatically retractable blade, the locking assembly of which consists of a card slot located on the inner wall of the knife shell and a stop portion located on the knife holder, with a simple structure and no need to add complex accessories.

[0008] Another object of the present invention is to provide a utility knife with an automatically retractable blade, the rear end of the knife holder is provided with a stop portion and a guiding portion at intervals, and an engaging groove is formed between the stop portion and the guiding portion. By the cooperation of the engaging portion of the driving member and the engaging groove, the knife holder can be driven to move. After the operation is over, when the blade leaves the cutting object, the engaging portion of the driving member can be disengaged from the engaging groove along the guiding portion, so that the knife holder retracts into the receiving cavity, avoiding accidental injuries, and the structure is compact, which is beneficial to reducing the volume of the cutting tool.

[0009] To achieve the above object, the technical solution adopted by the present invention is as follows: A utility knife with an automatically retractable blade, comprising: a knife shell, the knife shell is provided with a receiving cavity and a port, and the port is opened at the front end of the knife shell; a knife holder for carrying the blade, the knife holder is movably installed in the receiving cavity, the knife holder is connected to the knife shell through a first elastic member, and a locking component is provided between the knife shell and the knife holder, so that the knife holder can be detachably fixed to the knife shell; a driving member, the driving member is movably installed in the receiving cavity, and the driving member is detachably connected to the knife holder to drive the knife holder to move; wherein, during operation, the knife holder rotates to be separated from the driving member, and the knife holder is fixed to the knife shell through the locking component; when the blade leaves the object to be cut at the end of the operation, the locking component is unlocked under the action of the first elastic member, and the knife holder can move relative to the knife shell, so that the blade retracts into the receiving cavity.

[0010] As a preference, the driving member is connected to the knife shell through a second elastic member, one end of the driving member is detachably abutted against the knife holder, 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 is hingedly installed on the knife shell, a driving part is arranged 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 shell into the movement of the driving member relative to the knife shell; wherein, pressing the handle can make the driving part push the knife holder to move, so that the blade exposes from the port; releasing the handle, the driving member and the handle can return to the initial position under the action of the second elastic member.

[0011] As a preference, the locking component includes a card slot located on the knife shell and a stop portion located on the knife holder, the card slot is located on the inner wall of the front end of the knife shell, and the stop portion protrudes from the knife holder; during operation, the stop portion is adapted to be engaged with the card slot, so that the knife holder can be detachably fixed to the knife shell.

[0012] As a preference, a fulcrum portion is further arranged on the knife holder; during operation, the fulcrum portion abuts against the knife shell, and the knife holder can rotate around the fulcrum portion, so that the knife holder is separated from the driving member, and the stop portion is engaged with the card slot.

[0013] As a preference, the tool holder and the driving member are stacked. At the rear end of the tool holder, a stop portion and a guiding portion are provided at intervals. The stop portion and the guiding portion protrude from the tool holder toward the side where the driving member is located. When the tool holder contracts into the accommodation cavity, the stop portion is adapted to abut against the tool housing. The upper surface of the guiding portion is inclined along the longitudinal direction of the tool housing. A joint groove is formed between the stop portion and the guiding portion. At the front end of the driving member, a joint portion protrudes toward the side where the tool holder is located. The joint portion is adapted to slide along the upper surface of the guiding portion so that the joint portion is combined with or separated from the joint groove. When the joint portion is received in the joint groove, the joint portion abuts against the rear end surface of the guiding portion to push the tool holder to move.

[0014] As a preference, the tool housing includes an upper housing and a lower housing. The tool holder and the driving member are received in the accommodation cavity between the upper housing and the lower housing. On the inner wall of the lower housing, elongated upper ribs and lower ribs protrude. An activity groove is formed between the upper ribs and the lower ribs. The tool holder is adapted to translate and / or rotate along the activity groove. On the inner wall of the upper housing, a slideway protrudes. The driving member abuts against the slideway and can move in the accommodation cavity along the slideway.

[0015] As a preference, the card slots include a first card slot and a second card slot. A plurality of the first card slots are located at the front end of the upper rib and are arranged along the extending direction of the upper rib. A plurality of the second card slots are located at the rear end of the lower rib and are arranged along the extending direction of the lower rib. The stop portions include a first stop portion and a second stop portion. The first stop portion protrudes at the front end of the upper side of the tool holder and is adapted to be engaged with the first card slot. The second stop portion protrudes at the rear end of the lower side of the tool holder and is adapted to be engaged with the second card slot.

[0016] As a preference, a first hook is provided at the rear end of the tool holder. A first hanging post protrudes from the lower housing. The first elastic member is connected between the first hook and the first hanging post, and can provide a force for the tool holder to contract back into the accommodation cavity, and at the same time provide a torque for the tool holder to rotate the tool holder so that the stop portion is separated from the card slot on the tool housing.

[0017] As a preference, a plurality of elongated first support ribs also protrude between the upper rib and the lower rib of the lower housing. The first support ribs abut against the back surface of the tool holder. A second support rib protrudes from the inner wall of the upper housing. The second support rib abuts against the front surface of the tool holder, and can clamp the tool holder between the upper housing and the lower housing. Description of the Drawings

[0018] Figure 1Schematic diagram of a utility knife with an automatically retractable blade according to some embodiments of the present application;

[0019] Figure 2 Schematic diagram of a utility knife with an automatically retractable blade according to some embodiments of the present application;

[0020] Figure 3 Internal structure diagram of a utility knife with an automatically retractable blade according to some embodiments of the present application;

[0021] Figure 4 Internal structure diagram of a utility knife with an automatically retractable blade according to some embodiments of the present application;

[0022] Figure 5 Internal structure diagram of a utility knife with an automatically retractable blade according to some embodiments of the present application;

[0023] Figure 6 Internal structure diagram of a utility knife with an automatically retractable blade according to some embodiments of the present application;

[0024] Figure 7 Internal structure diagram of a utility knife with an automatically retractable blade according to some embodiments of the present application;

[0025] Figure 8 Installation schematic diagram of the knife holder of a utility knife with an automatically retractable blade according to some embodiments of the present application;

[0026] Figure 9 Schematic diagram of the structure of the lower shell according to some embodiments of the present application;

[0027] Figure 10 Schematic diagram of the structure of the upper shell according to some embodiments of the present application;

[0028] Figure 11 Schematic diagram of the structure of the knife holder according to some embodiments of the present application;

[0029] Figure 12 Schematic diagram of the structure of the driving member according to some embodiments of the present application;

[0030] Figure 13 Internal structure diagram of a utility knife with an automatically retractable blade according to some embodiments of the present application;

[0031] Figure 14 Is Figure 13 Partial enlarged view at position A in;

[0032] Figure 15 Schematic diagram of the separation of the position-limiting portion of the knife holder and the card slot of the knife shell according to some embodiments of the present application;

[0033] Figure 16 Schematic diagram of the engagement between the stop portion of the tool holder and the card slot of the tool housing according to some embodiments of the present application.

[0034] In the figure: 10, tool housing; 11, upper housing; 111, slideway; 112, second support rib; 113, second hanging post; 114, fourth support rib; 115, tool change panel; 1151, elastic part; 12, lower housing; 121, upper rib; 122, lower rib; 123, movable slot; 124, card slot; 1241, first card slot; 1242, second card slot; 125, first hanging post; 126, first support rib; 127, third support rib; 1271, stroke slot; 128, guiding part; 13, accommodation cavity; 14, port; 20, driving part; 21, second elastic part; 22, driving surface; 23, engaging part; 24, second hook; 25, accommodating slot; 26, extension part; 27, stopping part; 261, sliding slot; 30, tool holder; 31, first elastic part; 32, stop portion; 321, first stop portion; 322, second stop portion; 33, fulcrum part; 34, stopping block; 35, guiding portion; 36, engaging groove; 37, first hook; 38, blade slot; 381, magnetic attraction slot; 39, mounting part; 40, blade; 41, limiting opening; 50, handle; 51, driving portion; 52, limiting boss; 53, runner; 60, safety push button; 70, locking assembly. Detailed embodiments

[0035] Next, in combination with the specific embodiments, the present invention will be further described. It should be noted that, on the premise of no conflict, the following-described embodiments or technical features can be arbitrarily combined to form new embodiments.

[0036] In the description of the present invention, it should be noted that for the orientation terms, such as the terms "center", "transverse", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., the orientation and position relationships indicated are based on the orientation or position relationships shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present invention.

[0037] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence.

[0038] It should be noted that terms such as "front" and "back" are used to indicate directions for facilitating the description of the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation. It can also be expressed as "upper", "lower", or "one side", "the other side", etc., and should not be construed as limiting the specific protection scope of the present invention.

[0039] A utility knife with an automatically retractable blade, as Figures 1-8 shown, includes: a knife shell 10, a knife seat 30, and a driving member 20. The knife shell 10 is provided with a receiving cavity 13 and a port 14, and the port 14 is opened at the front end of the knife shell 10; the knife seat 30 is used to carry the blade 40, the knife seat 30 is movably installed in the receiving cavity 13, and is connected to the knife shell 10 through a first elastic member 31. Further, a locking assembly 70 is provided between the knife shell 10 and the knife seat 30, so that the knife seat 30 can be detachably fixed to the knife shell 10; the driving member 20 is movably installed in the receiving cavity 13, and the driving member 20 is detachably connected to the knife seat 30 to drive the knife seat 30 to move. During operation, the knife seat 30 rotates to be separated from the driving member 20, and the knife seat 30 is fixed to the knife shell 10 through the locking assembly 70. When the blade 40 leaves the object to be cut at the end of the operation, under the action of the first elastic member 31, the locking assembly 70 is unlocked, and the knife seat 30 can move relative to the knife shell 10, so that the blade 40 retracts into the receiving cavity 13.

[0040] That is to say, as Figure 5 and Figure 6 shown, during the cutting operation, the blade 40 abuts against the object to be cut, generating a torque that causes the knife seat 30 to rotate. Further, the knife seat 30 is separated from the driving member 20 and fixed to the knife shell 10 through the locking assembly 70, preventing the knife seat 30 from retracting into the receiving cavity 13 during cutting, which is convenient for cutting operations. As Figure 7 shown, after the cutting operation is completed, the blade 40 is separated from the object to be cut. Under the action of the first elastic member 31, the locking assembly 70 is unlocked, the knife seat 30 is separated from the knife shell 10, and the knife seat 30 can move relative to the driving member 20 and retract into the receiving cavity 13, avoiding the blade 40 being exposed outside the knife shell 10 and causing accidental injury to the human body.

[0041] In some embodiments, as Figure 4 and Figure 6As shown, the driving member 20 is connected to the knife housing 10 through the second elastic member 21. One end of the driving member 20 is detachably abutted against the tool holder 30. The other end of the driving member 20 is provided with a driving surface 22, and the driving surface 22 is arranged at an angle to the moving direction of the driving member 20. Further, the utility knife with automatically retractable blade further includes a handle 50. The handle 50 is hingedly installed on the knife housing 10. The handle 50 is provided with a driving portion 51. The driving portion 51 abuts against the driving surface 22, so as to convert the rotation of the handle 50 relative to the knife housing 10 into the movement of the driving member 20 relative to the knife housing 10. That is to say, by pressing the handle 50, the driving portion 51 can push the tool holder 30 to move, so that the blade 40 is exposed from the port 14. When the handle 50 is released, the driving member 20 and the handle 50 can return to the initial position under the action of the second elastic member 21.

[0042] Specifically, when the handle 50 is pressed, through the cooperation of the driving portion 51 and the driving surface 22, the driving member 20 can move relative to the knife housing 10. Then, the driving member 20 pushes the tool holder 30 to move so that the blade 40 extends out of the receiving cavity 13 from the port 14. During the cutting operation, the blade 40 abuts against the object to be cut, generating a torque that causes the tool holder 30 to rotate. Then, the tool holder 30 can be separated from the driving member 20 and fixed to the knife housing 10 through the locking assembly 70, which is convenient for cutting operations. After the cutting is completed, the blade 40 is separated from the object to be cut. Under the action of the first elastic member 31, the tool holder 30 can be separated from the knife housing 10 and then retracted into the receiving cavity 13, avoiding accidental injuries when waving the tool. That is to say, after the cutting operation is completed, there is no need to release the handle 50 to drive the driving member 20 to drive the tool holder 30 to retract into the receiving cavity 13. Further, after the handle 50 is released, under the action of the second elastic member 21, the driving member 20 and the handle 50 can return to the initial position, and the driving member 20 is engaged with the tool holder 30. When the handle 50 is pressed next time, the driving member 20 can push the tool holder 30 to move relative to the knife housing 10.

[0043] It can be understood that after the operation is stopped, since the tool holder 30 and the blade 40 have been retracted into the receiving cavity 13 under the action of the first elastic member 31, even if the user subconsciously still pinches the handle 50 or even waves the tool, the blade 40 will not cause harm to people. Moreover, if the utility knife needs to be used again, just release and press the handle 50, which is simple to operate.

[0044] Further, as Figure 5 and Figure 6As shown, the utility knife with the automatically retracting blade 40 further includes a rotating wheel 53, which is rotatably mounted on the driving portion 51 of the handle 50, and the rotating wheel 53 abuts against the driving surface 22 of the driving member 20. In other words, the handle 50 abuts against the driving surface 22 on the driving member 20 through the rotating wheel 53 mounted on the driving portion 51, and the rotating wheel 53 and the driving surface 22 are in rolling contact, thereby reducing friction, improving the smoothness of the driving member 20 and the knife seat 30 moving by pressing the handle 50 when the knife is used, and at the same time, it is beneficial to reduce the wear of the handle 50 and the driving member 20, and extend the service life of the knife.

[0045] Furthermore, Figure 3 and Figure 5 As shown, 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 is retained in the accommodating cavity 13 to shield the accommodating cavity 13 .

[0046] In some embodiments, Figure 8 , Figure 9 and Figure 11 As shown, the locking assembly 70 includes a slot 124 located on the knife housing 10 and a stop portion 32 located on 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 arranged 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.

[0047] It is understandable 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 out 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.

[0048] During the cutting operation, the blade 40 abuts against the object to be cut, generating a torque on the knife seat 30 to rotate the knife seat 30, and further the protruding stop portion 32 on the knife seat 30 abuts against the recessed slot 124 on the inner wall of the knife housing 10, and then the knife seat 30 and the knife housing 10 are fixed to prevent the blade 40 from shrinking back into the accommodating cavity 13 during cutting. In other words, the knife housing 10 and the knife seat 30 are fixed by the concave slot 124 and the protruding stop portion 32, and the structure is simple, and the effect of fixing the knife housing 10 and the knife seat 30 during the cutting operation can be achieved without adding complicated accessories.

[0049] Further, such as Figure 9As shown, a fulcrum portion 33 is further provided on the tool holder 30. During operation, the fulcrum portion 33 abuts against the inner wall of the tool housing 10, and the tool holder 30 can rotate around the fulcrum portion 33, so that the tool holder 30 is separated from the driving member 20, and the positioning portion 32 is engaged with the card slot 124. It can be understood that the fulcrum portion 33 can be protrudingly provided on the tool holder 30, or the corner portion of the tool holder 30 can be used as the fulcrum portion 33, that is, the corner portion of the tool holder 30 abuts against the tool housing 10, so that the tool holder 30 rotates around its corner portion.

[0050] In an alternative embodiment, the fulcrum portion 33 is protrudingly provided on the upper side edge of the tool holder 30. When the blade 40 abuts against the object to be cut, the fulcrum portion 33 on the tool holder 30 abuts against the inner wall of the tool housing 10, and the tool holder 30 rotates around the contact point between the fulcrum portion 33 and the tool housing 10, so that the tool holder 30 is separated from the driving member 20, and the positioning portion 32 on the tool holder 30 is engaged with the card slot 124 on the tool housing 10, so that the tool holder 30 is fixed to the tool housing 10.

[0051] In some embodiments, as Figures 3-7 shown, the tool holder 30 and the driving member 20 are stacked. A stop portion 34 and a guiding portion 35 are provided at intervals at the rear end of the tool holder 30. The stop portion 34 and the guiding portion 35 protrude from the tool holder 30 toward the side where the driving member 20 is located. When the tool holder 30 contracts into the receiving cavity 13, the stop portion 34 is adapted to abut against the tool housing 10. The upper surface of the guiding portion 35 is inclined along the longitudinal direction of the tool housing 10. A joint groove 36 is formed between the stop portion 34 and the guiding portion 35, making the structure of the tool holder 30 more compact. A joint portion 23 protrudes from the front end of the driving member 20 toward the tool holder 30. The joint portion 23 is adapted to slide along the upper surface of the guiding portion 35, so that the joint portion 23 is combined with or separated from the joint groove 36. When the joint portion 23 is received in the joint groove 36, the joint portion 23 abuts against the rear end surface of the guiding portion 35 to push the tool holder 30 to move.

[0052] Specifically, when the handle 50 is pressed, the handle 50 cooperates with the driving surface 22 of the driving member 20 through the runner 53, so as to drive the driving member 20 to move forward toward the front end of the tool housing 10. At this time, the joint portion 23 of the driving member 20 is received in the joint groove 36 of the tool holder 30, and the front end of the joint portion 23 abuts against the rear end of the guiding portion 35, so as to push the tool holder 30 to move forward toward the front end of the tool housing 10, so that the blade 40 is exposed from the port 14.

[0053] As Figure 5 and Figure 6 shown, during the cutting operation, the blade 40 abuts against the object to be cut, so that the tool holder 30 rotates, and then the joint portion 23 moves out of the joint groove 36 from the upper side opening of the joint groove 36, so that the tool holder 30 is separated from the driving member 20. As Figure 7As shown, after the cutting operation is completed, the blade 40 is separated from the object to be cut, and the blade holder 30 is retracted into the accommodating cavity 13 under the action of the first elastic member 31 until the stopper 34 abuts against the inner wall of the blade housing 10, 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 a direction away from the engaging groove 36. Figure 3 and Figure 4 As shown, 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, and 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 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.

[0054] In some embodiments, Figures 8-10 As shown, the knife housing 10 includes an upper housing 11 and a lower housing 12, and the knife seat 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, and a movable groove 123 is formed between the upper rib 121 and the lower rib 122, and the knife seat 30 is suitable for translation and / or rotation along the movable groove 123. That is, when the driving member 20 pushes the knife seat 30 to move, the corner and / or the fulcrum portion 33 of the knife seat 30 abut against the upper rib 121 and the lower rib 122, so as to move in the movable groove 123, and when the blade 40 abuts against the object to be cut, the knife seat 30 is able to rotate in the movable groove 123 around the fulcrum portion 33, so that the stop portion 32 is engaged with the clamping groove 124.

[0055] Further, such as Figure 9 As shown, the slot 124 includes a first slot 1241 and a second slot 1242, a plurality of 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, a plurality of 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 disposed 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 disposed at the rear end of the lower side of the knife seat 30, and is suitable for being engaged with the second slot 1242.

[0056] In some embodiments, Figure 8As shown, the first elastic member 31 is a tension spring. A first hook 37 is provided at the rear end of the tool holder 30, and a first hanging post 125 protrudes from the lower housing 12. The first elastic member 31 is connected between the first hook 37 and the first hanging post 125, so as to provide a force for the tool holder 30 to retract into the receiving cavity 13, and at the same time provide a torque to the tool holder 30, so that the tool holder 30 rotates to separate the positioning portion 32 from the card slot 124 on the tool housing 10.

[0057] Furthermore, an arc-shaped guiding portion 128 protrudes from the inner wall of the lower housing 12. The guiding portion 128 is located between the tool holder 30 and the first hanging post 125, and the first elastic member 31 can extend from the first hook 37 to the first hanging post 125 along the guiding portion 128. It can be understood that the guiding portion 128 can support and guide the first elastic member 31, so that the first elastic member 31 stretches or contracts along the guiding portion 128, which is beneficial to avoiding interference between the first elastic member 31 and other structures in the driving member 20 or the tool housing 10 during the stretching or contracting process, enabling the tool holder 30 to move smoothly along the moving groove 123, and is beneficial to improving the reliability of tool use.

[0058] Specifically, as Figures 13-15 shown, when the driving member 20 pushes the tool holder 30 to move, the front end of the engaging portion 23 abuts against the rear end of the guiding portion 35, so as to push the tool holder 30 to move towards the front end of the tool housing 10. The corner and / or the fulcrum portion 33 at the rear end of the upper side of the tool holder 30 abuts against the upper rib 121, and the corner at the front end of the lower side of the tool holder 30 abuts against the lower rib 122. That is to say, the first positioning portion 321 at the front end of the upper side of the tool holder 30 is separated from the upper rib 121, so as to avoid interference between the first positioning portion 321 and a plurality of first card slots 1241, and the second positioning portion 322 at the rear end of the lower side of the tool holder 30 is separated from the lower rib 122, so as to avoid interference between the second positioning portion 322 and a plurality of second card slots 1242, thereby enabling the tool holder 30 to move smoothly between the upper rib 121 and the lower rib 122.

[0059] During the cutting operation, as Figure 16As shown, the blade 40 abuts against the object to be cut, generating a torque that causes the tool holder 30 to rotate around the fulcrum portion 33. The engaging portion 23 moves out of the engaging groove 36 from the upper-side opening of the engaging groove 36, separating the tool holder 30 from the driving member 20. At the same time, the corner at the rear end of the upper side of the tool holder 30 disengages from the upper rib 121, the corner at the front end of the lower side of the tool holder 30 disengages from the lower rib 122, and the first stop portion 321 abuts against the first card slot 1241, and the second stop portion 322 abuts against the second card slot 1242, fixing the tool holder 30 to the tool housing 10. It can be understood that when the tool holder 30 is separated from the driving member 20, by combining the first stop portion 321 located at the front end of the upper side of the tool holder 30 with the first card slot 1241, and by combining the second stop portion 322 located at the rear end of the lower side of the tool holder 30 with the second card slot 1242, the acting force of the first elastic member 31 on the tool holder 30 is overcome, enabling the tool holder 30 to be reliably fixed to the tool housing 10.

[0060] After the cutting operation is completed, as Figure 15 shown, the blade 40 disengages from the object to be cut, and the tool holder 30 rotates reversely under the action of the first elastic member 31, causing the first stop portion 321 to disengage from the first card slot 1241, the second stop portion 322 to disengage from the second card slot 1242, and the corner at the rear end of the upper side of the tool holder 30 and / or the fulcrum portion 33 to abut against the upper rib 121, and the corner at the front end of the lower side of the tool holder 30 to abut against the lower rib 122. At the same time, under the action of the first elastic member 31, the tool holder 30 moves backward along the movable slot 123, and the engaging portion 23 of the driving member 20 moves along the upper surface of the guiding portion 35 in a direction away from the engaging groove 36 until the stop portion 34 abuts against the inner wall of the tool housing 10, and the tool holder 30 and the blade 40 contract into the accommodation cavity 13.

[0061] When the handle 50 is released, the driving member 20 and the handle 50 return to the initial position 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 guiding portion 35 in the direction of the engaging groove 36 until it falls into the engaging groove 36, and the driving member 20 is engaged with the tool holder 30 again.

[0062] Furthermore, as Figure 9 and Figure 10 shown, a plurality of slender first support ribs 126 are protruding between the upper rib 121 and the lower rib 122 of the lower housing 12. The first support ribs 126 abut against the back surface of the tool holder 30, and the second support rib 112 is protruding from the inner wall of the upper housing 11. The second support rib 112 abuts against the front surface of the tool holder 30, clamping the tool holder 30 between the upper housing 11 and the lower housing 12, preventing the tool holder 30 from shaking between the upper housing 11 and the lower housing 12 during the cutting operation, improving the stability of the tool holder 30, and being beneficial to improving the safety and reliability of using the tool for cutting.

[0063] In some embodiments, as Figure 10 shown, an inner wall of the upper housing 11 is convexly provided with a slideway 111, and the driving member 20 abuts against the slideway 111, so as to move in the accommodation cavity 13 along the slideway 111. In a specific embodiment, the upper housing 11 is provided with two slideways 111 which are distributed front and rear and spaced apart. Among them, the slideway 111 at the front end of the upper housing 11 can support the front end of the driving member 20, and the slideway 111 at the rear end of the upper housing 11 can support the rear end of the driving member 20, so that the driving member 20 moves back and forth in the accommodation cavity 13 under the drive of the handle 50.

[0064] It is worth mentioning that, as Figures 12 to 14 shown, the front end of the driving member 20 is provided with an extension portion 26, and a chute 261 is formed on one side of the extension portion 26 facing the lower housing 12. The chute 261 is adapted to cooperate 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 housing 12.

[0065] Furthermore, a third support rib 127 is convexly provided on the inner wall of the lower housing 12, and the third support rib 127 abuts against the back surface of the driving member 20. A fourth support rib 114 is convexly provided on the inner wall of the upper housing 11, and the fourth support rib 114 and the slideway 111 abut against the front surface of the driving member 20, so as to clamp the driving member 20 between the upper housing 11 and the lower housing 12, avoiding abnormal noise caused by the driving member 20 shaking between the upper housing 11 and the lower housing 12, and at the same time being beneficial to improving the reliability of the driving member 20 moving relative to the tool holder 10.

[0066] Even further, as Figures 7-9 shown, a longitudinally extending travel groove 1271 is formed on the third support rib 127. A stop portion 27 is convexly provided on one side of the rear end of the driving member 20 facing the lower housing 12. The stop portion 27 is adapted to move in the travel groove 1271, so that the driving member 20 moves within the length range of the travel groove 1271. That is to say, when the driving member 20 is in the initial position, the stop portion 27 abuts against the rear groove wall of the travel groove 1271. When the handle 50 is pressed to drive the driving member 20 to move forward, the stop portion 27 abuts against the front groove wall of the travel groove 1271. Furthermore, through the cooperation of the stop portion 27 and the travel groove 1271, the driving member 20 moves within the length range of the travel groove 1271, so as to limit the maximum displacement of the driving member 20 and the maximum rotation angle of the handle 50, so that when the tool holder 30 moves forward, the docking position is accurate and the repeatability is good.

[0067] Further, as Figure 4 and Figure 6As shown, the second elastic member 21 is a tension spring. A second hook 24 is provided at the rear end of the driving member 20, and 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, so as to provide a restoring force to the driving member 20 to return to the initial position. Further, the driving member 20 is further provided with a longitudinally extending accommodating groove 25, and the accommodating groove 25 is adapted to accommodate the second elastic member 21. Specifically, the second hanging post 113 is located at the front end of the accommodating groove 25. One end of the second elastic member 21 is hooked to the second hook 24, and the second elastic member 21 is accommodated in the accommodating groove 25 and extends along the accommodating groove 25 towards the rear end of the knife housing 10. The other end of the second elastic member 21 is hooked to the second hanging post 113 located at the rear end of the knife housing 10. It can be understood that by providing 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, by placing the second elastic member 21 in the accommodating groove 25, it can be avoided that the second elastic member 21 interferes with other structures in the knife housing 10 during stretching or contraction, so that the driving member 20 can move smoothly in the knife housing 10, which is beneficial to improving the reliability of tool use.

[0068] In some embodiments, as Figure 8 and Figure 11 shown, a blade groove 38 and a magnetic attraction groove 381 are provided on the front surface of the tool holder 30. The blade groove 38 is adapted to accommodate the blade 40, and the magnetic attraction groove 381 is used to install a magnetic attraction member. The magnetic attraction member can attract the blade 40, so that the blade 40 fits against the wall surface of the blade groove 38, which can improve the installation reliability of the blade 40 and the tool holder 30, and avoid the blade 40 moving or shaking relative to the tool holder 30 during cutting operations, thus improving the safety and reliability of tool use.

[0069] Further, as Figure 4 、 Figure 6 and Figure 11 shown, an installation portion 39 protrudes from the front surface of the tool holder 30. A limiting opening 41 is provided at the upper end of the blade 40. The installation portion 39 is adapted to pass through the limiting opening 41 to fix the blade 40, so that the positioning of the blade 40 on the tool holder 30 is more accurate and convenient for installation.

[0070] In some embodiments, as Figure 1 and Figure 2 shown, a tool changing panel 115 is installed at the front end of the upper housing 11. An elastic portion 1151 is provided on the tool changing panel 115. By pressing the elastic portion 1151, the tool changing panel 115 can be separated from the upper housing 11 to expose the blade 40, which is convenient for replacing the blade 40.

[0071] In some embodiments, as Figure 3 and Figure 4As shown, the utility knife with an automatically retractable blade 40 further includes a safety push button 60. The safety push button 60 is slidably mounted at the rear end of the knife housing 10. The safety push button 60 is adapted to abut against the inner end face of the handle 50, so that the handle 50 is held in the initial position, avoiding accidental injury caused by the blade 40 protruding from the port 14 when the knife is carried or stored due to accidental contact with the handle 50, and further improving the safety of the knife.

[0072] The basic principles, main features and advantages of the present invention have been described above. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. An art knife with an automatically retractable blade, characterized in that, Comprising: A knife shell, the knife shell is provided with a receiving cavity and a port, the port is opened at the front end of the knife shell, and the knife shell includes an upper shell and a lower shell; A knife seat for carrying a blade, the knife seat is movably installed in the receiving cavity, the knife seat is connected to the knife shell through a first elastic member, and a locking component is provided between the knife shell and the knife seat, so that the knife seat can be detachably fixed to the knife shell; A driving member, the driving member is movably installed in the receiving cavity, and the driving member is detachably connected to the knife seat to drive the knife seat to move; The locking component includes a card slot located on the knife shell and a stop portion located on the knife seat; A first hook is provided at the rear end of the knife seat, a first hanging post protrudes from the lower shell, and the first elastic member is connected between the first hook and the first hanging post, so as to provide a force for the knife seat to retract into the receiving cavity, and at the same time provide a torque to the knife seat, so that the knife seat rotates to separate the stop portion from the card slot on the knife shell; An arc-shaped guiding portion protrudes from the inner wall of the lower shell, the guiding portion is located between the knife seat and the first hanging post, and the first elastic member can extend from the first hook to the first hanging post along the guiding portion; The driving member is connected to the knife shell through a second elastic member, a second hook is provided at the rear end of the driving member, a second hanging post protrudes from the rear end of the upper shell, and the second elastic member is connected between the second hook and the second hanging post, so as to provide a force for the driving member to return to the initial position; The driving member is also provided with a longitudinally extending receiving groove, the receiving groove is adapted to receive the second elastic member, and the second hook is located at the front end of the receiving groove; Wherein, during operation, the knife seat rotates to be separated from the driving member, and the knife seat is fixed to the knife shell through the locking component; when the blade leaves the object to be cut at the end of the operation, the locking component is unlocked under the action of the first elastic member, and the knife seat can move relative to the knife shell, so that the blade retracts into the receiving cavity.

2. The utility knife with an automatically retractable blade according to claim 1, wherein, One end of the driving member is detachably abutted against the knife seat, 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 includes a handle, the handle is hingedly installed on the knife shell, a driving portion is provided on the handle, and the driving portion abuts against the driving surface, so as to convert the rotation of the handle relative to the knife shell into the movement of the driving member relative to the knife shell; Wherein, pressing the handle can make the driving portion push the knife seat to move, so that the blade exposes from the port; releasing the handle, the driving member and the handle can return to the initial position under the action of the second elastic member.

3. The utility knife with an automatically retractable blade according to claim 2, characterized in that, The card slot is located on the inner wall of the front end of the knife shell, and the stop portion protrudes from the knife seat; during operation, the stop portion is adapted to be engaged with the card slot, so that the knife seat can be detachably fixed to the knife shell.

4. The utility knife with an automatically retractable blade according to claim 3, characterized in that, The tool rest is further provided with a fulcrum portion; during operation, the fulcrum portion abuts against the tool housing, and the tool rest can rotate around the fulcrum portion, so that the tool rest is separated from the driving member, and the positioning portion is clamped in the card slot.

5. The utility knife with an automatically retractable blade according to claim 3, wherein, The tool rest and the driving member are stacked, and a stop portion and a guiding portion are provided at intervals at the rear end of the tool rest. The stop portion and the guiding portion protrude from the tool rest toward the side where the driving member is located; when the tool rest contracts into the accommodating cavity, the stop portion is adapted to abut against the tool housing, and the upper surface of the guiding portion is inclined along the longitudinal direction of the tool housing. A joint groove is formed between the stop portion and the guiding portion; A joint portion protrudes from the front end of the driving member toward the side where the tool rest is located. The joint portion is adapted to slide along the upper surface of the guiding portion, so that the joint portion is combined with or separated from the joint groove; when the joint portion is received in the joint groove, the joint portion can abut against the rear end surface of the guiding portion to push the tool rest to move.

6. The utility knife with an automatically retractable blade according to claim 4, characterized in that, The tool rest 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 protrudes with elongated upper ribs and lower ribs, and an activity groove is formed between the upper ribs and the lower ribs. The tool rest is adapted to translate and / or rotate along the activity groove; the inner wall of the upper shell protrudes with a slideway, and the driving member abuts against the slideway and can move in the accommodating cavity along the slideway.

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. A plurality of the first card slots are located at the front end of the upper rib and are arranged along the extending direction of the upper rib; a plurality of the second card slots are located at the rear end of the lower rib and are arranged along the extending direction of the lower rib; the positioning portion includes a first positioning portion and a second positioning portion. The first positioning portion protrudes from the front end of the upper side of the tool rest and is adapted to be clamped with the first card slot. The second positioning portion protrudes from the rear end of the lower side of the tool rest and is adapted to be clamped with the second card slot.

8. The utility knife with an automatically retractable blade according to claim 7, characterized in that, A plurality of elongated first support ribs further protrude between the upper rib and the lower rib of the lower shell. The first support ribs abut against the back surface of the tool rest. The inner wall of the upper shell protrudes with a second support rib. The second support rib abuts against the front surface of the tool rest, so that the tool rest can be clamped between the upper shell and the lower shell.

9. The utility knife with an automatically retractable blade according to claim 8, wherein An extension portion is provided at the front end of the driving member. A chute is formed on the side of the extension portion facing the lower shell. The chute is adapted to cooperate with the upper rib, so that the driving member moves along the upper rib; The inner wall of the lower shell protrudes with a third support rib. The third support rib abuts against the back surface of the driving member. The inner wall of the upper shell protrudes with a fourth support rib. The fourth support rib and the slideway abut against the front surface of the driving member, so that the driving member can be clamped between the upper shell and the lower shell; A longitudinal extending travel groove is formed in the third support rib, and a stop portion is protrudingly provided on the rear end of the driving member toward the lower housing side. The stop portion is adapted to move in the travel groove, so that the driving member can move within the length range of the travel groove; A blade groove and a magnetic attraction groove are formed on the front surface of the tool holder. The blade groove is adapted to accommodate a blade, and the magnetic attraction groove is used for installing a magnetic attraction member, and the magnetic attraction member can attract the blade; An installation portion is also protrudingly provided on the front surface of the tool holder. A limiting opening is formed at the upper end of the blade, and the installation portion is adapted to pass through the limiting opening to fix the blade; A limiting boss is protrudingly provided on the side surface of the handle. When the handle is in the initial position, the limiting boss abuts against the inner wall of the tool housing, so that at least a part of the handle is held in the accommodation cavity; A tool change panel is installed at the front end of the upper housing. An elastic portion is provided on the tool change panel. By pressing the elastic portion, the tool change panel and the upper housing can be separated to expose the blade; The utility knife with an automatically retractable blade further includes a runner, and the runner is rotatably installed on the driving portion of the handle and abuts against the driving surface of the driving member; The utility knife with an automatically retractable blade further includes a safety push button, and the safety push button is slidably installed at the rear end of the tool housing. The safety push button is adapted to abut against the inner end surface of the handle to keep the handle in the initial position.

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