Safety utility knife

Abstract

The present invention provides a safety utility knife, which relates to the technical field of cutting tools. It includes an outer frame, a knife holder, a protective frame and a first elastic reset member; the knife holder is fixedly installed in the outer frame, and at least part of the blade on the knife holder extends out of the knife holder; the protective frame is slidably installed in the outer frame, and the protective frame is provided with a protective part extending out of the outer frame. When the protective frame is in the first position, the protective part sleeves the blade, and when in the second position, the protective part releases the sleeving of the blade; the first elastic reset member is installed in the outer frame and is used to drive the protective frame to reset from the second position to the first position. In the present invention, the knife holder is designed as a fixed structure, and there is no need to operate the knife holder to extend or retract the blade during cutting operations, which simplifies the structure and is beneficial to the cutting operation. At the same time, the cooperation of the first elastic reset member and the protective frame realizes the moment protection of the blade, preventing the blade from being bruised or cutting external objects, and improving the safety of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of cutting tools, and particularly relates to a safety utility knife. Background Art

[0002] A utility knife is a commonly used manual cutting tool. Existing utility knives generally perform cutting or storage by the blade on the knife holder telescoping relative to the outer frame. It is necessary to perform corresponding operations on the knife holder to extend the blade for cutting, which is cumbersome in operation. Moreover, the blade is prone to being exposed. To protect the exposed blade, the prior art generally uses an openable and closable blade protection structure to protect the blade. When in use, first manually touch the protection of the blade protection structure and then perform cutting. This not only has a complex structure but also further increases the complexity of the operation. Summary of the Invention

[0003] The purpose of the present invention is to provide a safety utility knife to solve the problems of cumbersome operation and complex structure of existing utility knives.

[0004] To solve the above technical problems, the present invention first provides a safety utility knife, and the specific technical solution is as follows:

[0005] A safety utility knife includes an outer frame, a knife holder, a protection frame, and a first elastic reset member; the knife holder is fixedly installed in the outer frame, a blade is installed on the knife holder, and at least a part of the blade extends outside the knife holder; the protection frame is slidably installed in the outer frame, the protection frame is provided with a protection part extending outside the outer frame, the protection frame can slide from a first position to a second position under the action of an external force. When in the first position, the protection part sleeves the blade, and when in the second position, the protection part releases the sleeving of the blade; the first elastic reset member is installed in the outer frame, one end of which is connected to the outer frame, and the other end is connected to the protection frame, and the first elastic reset member is used to drive the protection frame to reset from the second position to the first position.

[0006] Furthermore, a normally closed locking assembly is provided on the top wall of the outer frame, the locking assembly is connected to the protection frame and is used to lock the sliding of the protection frame. When the locking assembly is opened, the protection frame can slide between the first position and the second position under the action of an external force.

[0007] Further, the locking component includes a first button and a second elastic reset member; the first button includes a pressing portion and a locking portion connected vertically. The pressing portion is located outside the outer frame, and the locking portion is located inside the outer frame. A first sliding groove is provided on one side of the locking portion; the second elastic reset member is located inside the outer frame, one end of which is connected to the pressing portion and the other end is connected to the outer frame. The second elastic reset member is used to drive the first button after being pressed down to reset; the protective frame is provided with a first limiting block, and the first limiting block is in limiting cooperation with the locking portion to limit the sliding of the protective frame. Press down the first button, and the first limiting block is in sliding cooperation with the first sliding groove to release the restriction on the sliding of the protective frame.

[0008] Further, an auxiliary pressing structure is further provided on the top wall of the outer frame. The auxiliary pressing structure includes a rod body and a pressing plate connected to each other; one end of the rod body is hinged on the outer frame, and the other end is connected to the pressing plate; the pressing plate and the rod body form an angle with each other. The length and width of the pressing plate are both greater than the length and width of the pressing portion, and the lower side of the pressing plate is connected to the pressing portion.

[0009] Further, both sides of the pressing plate are provided with side plates, and the side wall of the outer frame is provided with a receiving groove for receiving the side plates.

[0010] Further, a tool changing component is further included. The tool changing component is installed on the side wall of the outer frame and is in limiting cooperation with the blade. The tool changing component can be disengaged from the limiting cooperation with the blade under an external force.

[0011] Further, the tool changing component includes a second button, a pressing block and a third elastic reset member connected in sequence; the pressing block is provided with a limiting portion, and a notch for limiting cooperation with the limiting portion is provided on one side of the blade. Press down the second button, and the limiting portion can be disengaged from the notch; the third elastic reset member is used to drive the limiting portion to reset into the notch.

[0012] Further, a gear lock is installed on the side wall of the tool rest, and the protective frame is provided with a first gear portion; when the gear lock is opened and the protective frame slides to a third position between the first position and the second position, the gear lock is in limiting cooperation with the first gear portion to lock the sliding of the protective frame towards the second position.

[0013] Further, a second sliding groove is provided on the side wall of the outer frame, and the length direction of the second sliding groove is perpendicular to the length direction of the protective frame. The gear lock includes a second limiting block slidably mounted on the second sliding groove. The first gear portion includes a first limiting wall provided on the side wall of the protective frame. When the second limiting block slides to a preset position and the protective frame slides to the third position, the second limiting block is in limiting cooperation with the first limiting wall.

[0014] Further, the protective frame is further provided with a second gear portion and a third gear portion. The first gear portion includes a second limiting wall, and the third gear portion includes a third limiting wall. The first limiting wall is located between the second limiting wall and the third limiting wall. The second limiting block is located at one end of the second sliding groove. When the protective frame is in the first position, the second limiting wall is in limiting cooperation with the second limiting block. The second limiting block is located at the other end of the second sliding groove. When the protective frame is in the second position, the third limiting wall is in limiting cooperation with the second limiting block.

[0015] According to the safety utility knife provided by the present invention, the knife holder is designed as a fixed structure, and there is no need to operate the knife holder to extend or retract the blade during the cutting operation, which simplifies the structure and is beneficial to the cutting operation. At the same time, the cooperation of the first elastic reset member and the protective frame realizes the moment protection of the blade, prevents the blade from being damaged or cutting external objects, and improves the safety of the product. Description of the Drawings

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic structural diagram of the safety utility knife provided by the embodiment of the present invention;

[0018] Figure 2 It is a schematic structural diagram of the locking component and the knife-changing component of the safety utility knife provided by the embodiment of the present invention;

[0019] Figure 3 It is a schematic internal structural diagram (one) of the safety utility knife provided by the embodiment of the present invention when the gear lock is in the locked state;

[0020] Figure 4 It is a schematic internal structural diagram (two) of the safety utility knife provided by the embodiment of the present invention when the gear lock is in the locked state;

[0021] Figure 5 Schematic diagram of the internal structure of the safety utility knife provided by the embodiment of the present invention when the gear lock is opened to the half-knife state;

[0022] Figure 6 Schematic diagram of the internal structure of the safety utility knife provided by the embodiment of the present invention when the gear lock is fully opened.

[0023] Icon:

[0024] 100 - Outer frame; 110 - Top wall; 120 - Bottom wall; 130 - Side wall; 131 - Accommodating groove; 132 - Second chute; 140 - Rubber coating;

[0025] 200 - Knife holder; 210 - Blade; 211 - Notch;

[0026] 300 - Protection frame; 310 - Protection part; 320 - First limiting block; 330 - First limiting wall; 340 - Second limiting wall; 350 - Third limiting wall; 360 - First step; 370 - Second step;

[0027] 400 - First elastic reset member;

[0028] 500 - Locking assembly; 510 - First button; 511 - Pressing part; 512 - Locking part; 5121 - First chute; 520 - Second elastic reset member;

[0029] 600 - Auxiliary pressing structure; 610 - Rod body; 620 - Pressing plate; 621 - Side plate;

[0030] 700 - Knife-changing assembly; 710 - Second button; 720 - Pressing block; 721 - Limiting part; 730 - Third elastic reset member;

[0031] 800 - Gear lock; 810 - Second limiting block; 820 - Third button. Detailed implementation manners

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0033] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is customarily placed during use. 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 therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0035] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0036] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The following will describe in detail some embodiments of the present invention with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0038] Based on the description in the background art, it can be known that existing utility knives all achieve the telescopic movement of the blade 210 relative to the outer frame 100 by moving the knife holder 200. This not only has cumbersome operations, but also easily causes safety hazards due to forgetting to retract the blade 210. Even if a protection structure is specifically added, it is necessary to manually contact the protection structure of the blade 210 to protect the blade 210 before cutting. This not only has a complex structure, but also further increases the complexity of the operation.

[0039] In view of this, the present embodiment provides a safety utility knife, aiming to change the specific cutting operation process by improving structures such as the knife holder 200 and the protection holder 300, and being able to protect the blade 210 at all times to solve the above problems existing in the existing utility knives.

[0040] Combined with the attached Figure 1 and 3 As shown, a safety utility knife provided in the present embodiment includes an outer frame 100, a knife holder 200, a protection holder 300, and a first elastic reset member 400; among them, the outer frame 100 of the present embodiment is the installation and protection foundation of the utility knife. The outer frame 100 includes a top wall 110, a bottom wall 120, and two side walls 130 connected between the top wall 110 and the bottom wall 120. And in order to improve the use feel, a rubber coating 140 is provided at the rear of the outer frame 100 in the present embodiment.

[0041] Different from the existing retractable knife holder 200 structure, the knife holder 200 of the present embodiment is fixedly installed in the outer frame 100, and the installation method can be a detachable fixed connection such as a screw. The blade 210 is installed on the knife holder 200 of the present embodiment, and at least part of the blade 210 extends out of the knife holder 200. In order to increase the cutting length of the fixed blade 210, the front end of the outer frame 100 is designed as a downward inclined structure in the present embodiment.

[0042] The protection holder 300 of the present embodiment is slidably installed in the outer frame 100. The protection holder 300 is provided with a protection part 310 that extends out of the outer frame 100. The protection holder 300 can slide from the first position to the second position under the action of an external force. When in the first position, the protection part 310 of the present embodiment is sleeved outside the blade 210, and the extending length of the protection part 310 is greater than the exposed length of the blade 210. When the protection holder 300 is in the second position, the protection part 310 of the present embodiment releases the sleeve on the blade 210. The first elastic reset member 400 of the present embodiment is installed in the outer frame 100, one end of which is connected to the outer frame 100, and the other end is connected to the protection holder 300. The first elastic reset member 400 is used to drive the protection holder 300 to reset from the second position to the first position.

[0043] Specifically, when the safety utility knife of the present embodiment is not in use, the protection holder 300 of the present embodiment is in the first position. During cutting, the outer end of the protection holder 300 abuts against the object to be cut, and then the object to be cut overcomes the elastic force of the first elastic reset member 400 to drive the protection holder 300 to move to the second position, so that the blade 210 is exposed, and then cutting can be performed. After cutting is completed, the first elastic reset member 400 of the present embodiment drives the protection holder 300 to reset to the protection position, so that the protection part 310 can protect the blade 210. That is, the safety utility knife of the present embodiment improves the original blade 210 retraction to the retraction of the protection holder 300 to achieve cutting and protection of the blade 210.

[0044] This structure designs the knife holder 200 to be fixed, and there is no need to operate the knife holder 200 to extend or retract the blade 210 during the cutting operation. This simplifies the structure and facilitates the cutting operation. The first elastic reset member 400 and the protective frame 300 cooperate to achieve constant protection of the blade 210, preventing the blade 210 from being hit or cut by external objects, thereby improving the safety of the product.

[0045] Based on the above structure, in order to prevent misoperation and push the protection frame 300 into the tool holder 200, this embodiment also provides a locking assembly 500 in a normally closed state on the top wall 110. The locking assembly 500 is connected to the protection frame 300 and is used to lock the sliding of the protection frame 300. When the locking assembly 500 is opened, the protection frame 300 can slide between the above-mentioned first position and the second position under the action of external force.

[0046] Combined with Figure 2 As shown, the locking assembly 500 of this embodiment includes a first button 510 and a second elastic return member 520; the first button 510 includes a pressing portion 511 and a locking portion 512 that are vertically connected, the pressing portion 511 is located outside the outer frame 100, and the locking portion 512 is located inside the outer frame 100, and a first slide groove 5121 is provided on one side of the locking portion 512 of this embodiment; the second elastic return member 520 is located inside the outer frame 100, the upper end of the second elastic return member 520 is connected to the pressing portion 511, and the lower end is connected to the outer frame 100, and the second elastic return member 520 is used to drive the first button 510 to reset after being pressed down.

[0047] Correspondingly, the protection frame 300 of the present embodiment is provided with a first limit block 320. Under normal circumstances, the first limit block 320 is always limited and cooperated with the locking portion 512 to limit the sliding of the protection frame 300. When the elastic force of the second elastic reset member 520 is overcome to press down the first button 510 of the present embodiment, the locking portion 512 of the present embodiment moves downward relative to the first limit block 320, so that the first limit block 320 can fall into the first slide groove 5121, and can slide and cooperate with the first slide groove 5121 to release the restriction on the sliding of the protection frame 300, so that cutting operations can be performed, thereby further improving the safety performance.

[0048] Based on the above-mentioned locking component 500, the inventor found that due to individual differences among operators, the finger sizes and strengths of each operator are different. Therefore, in order to improve the adaptability of the locking component 500 in this embodiment to different operators, an auxiliary pressing structure 600 is further provided on the top wall 110 of the outer frame 100 in this embodiment. The auxiliary pressing structure 600 includes a rod body 610 and a pressing plate 620 that are connected to each other; one end of the rod body 610 is hinged to the outer frame 100, and the other end is connected to the pressing plate 620. The pressing plate 620 forms an angle with the rod body 610. The lower side of the pressing plate 620 is connected to the pressing portion 511. The rod body 610 and the pressing plate 620 form a lever-like structure to save the force required to press the first button 510.

[0049] And to improve the feel and comfort during pressing, the length and width of the pressing plate 620 in this embodiment are both greater than those of the pressing portion 511. Moreover, both sides of the pressing plate 620 in this embodiment are provided with side plates 621, and the side wall 130 of the outer frame 100 is provided with a receiving groove 131 for receiving the side plates 621 to improve the stability of the pressing plate 620 on the outer frame 100 and the integrity of the product.

[0050] Combined with the attached Figure 2 and 4 As shown, in order to facilitate the replacement of the blade 210, the safety utility knife in this embodiment further includes a knife-changing component 700. The knife-changing component 700 is installed on the side wall 130 of the outer frame 100 and is in limit cooperation with the blade 210. The knife-changing component 700 can be disengaged from the limit cooperation with the blade 210 under the action of an external force.

[0051] Specifically, the knife-changing component 700 in this embodiment includes a second button 710, a pressing block 720, and a third elastic reset member 730 that are connected in sequence; among them, the pressing block 720 in this embodiment is provided with a limiting portion 721, and the limiting portion 721 can be a convex block or a convex piece and other structures. Correspondingly, a notch 211 for limiting cooperation with the limiting portion 721 is provided on the upper side of the blade 210 in this embodiment. Pressing the second button 710 can cause the limiting portion 721 to disengage from the notch 211, so that the old blade 210 can be taken out, and then a new blade 210 can be put in. In order to facilitate the insertion of the new blade 210, the surfaces of the notch 211 and the limiting portion 721 in this embodiment are both designed as arc-shaped structures, so that the third elastic reset member 730 can drive the limiting portion 721 to reset into the notch 211 of the new blade 210.

[0052] In addition, to enable the protective frame 300 of this embodiment to achieve multi-gear adjustment, a gear lock 800 is also installed on the side wall 130 of the tool rest 200 in this embodiment. Correspondingly, the protective frame 300 of this embodiment is provided with a first gear portion (or called the half-knife gear portion). When the gear lock 800 of this embodiment is opened and the protective frame 300 slides to a third position between the first position and the second position, the gear lock 800 of this embodiment is in limit cooperation with the first gear portion to lock the sliding of the protective frame 300 towards the second position. When cutting, the protective frame 300 of this embodiment can only move between the second position and the third position, exposing the half-knife for half-knife cutting.

[0053] Specifically, as shown in the attached Figure 5 figure, a second sliding groove 132 is opened on the side wall 130 of the outer frame 100 in this embodiment. The length direction of the second sliding groove 132 is perpendicular to the length direction of the protective frame 300. The gear lock 800 of this embodiment includes a second limiting block 810 and a third button 820 that are slidably installed on the second sliding groove 132. The third button 820 is located outside the outer frame 100. The first gear portion of this embodiment includes a first limiting wall 330 provided on the side wall 130 of the protective frame 300. The length direction of the first limiting wall 330 is perpendicular to the length direction of the protective frame 300. When the second limiting block 810 of this embodiment slides to a preset position and the protective frame 300 slides to the third position, the second limiting block 810 is in limit cooperation with the first limiting wall 330.

[0054] In addition, the protective frame 300 of this embodiment is further provided with a second gear portion (or called the locking gear) and a third gear portion (or called the full-knife gear). The second gear portion of this embodiment includes a second limiting wall 340, and the third gear portion includes a third limiting wall 350. The first limiting wall 330 is located between the second limiting wall 340 and the third limiting wall 350.

[0055] As shown in the attached Figure 3 figure 4 and, when the second limiting block 810 of this embodiment is pushed to one end (the upper end in the figure) of the second sliding groove 132 and the protective frame 300 is in the first position, the second limiting wall 340 of this embodiment is in limit cooperation with the second limiting block 810. At this time, even if the locking assembly 500 of this embodiment is opened, the protective frame 300 of this embodiment cannot be moved, thus realizing the dual protection function of the blade 210.

[0056] As shown in the attached Figure 6 figure, when the second limiting block 810 is pushed to the lower end of the second sliding groove 132 and the protective frame 300 is in the second position, the third limiting wall 350 is in limit cooperation with the second limiting block 810. At this time, the blade 210 is completely exposed for full-knife cutting.

[0057] Preferably, one end of the first limiting wall 330 in this embodiment is connected to the second limiting wall 340 to form a first step 360, and the other end of the first limiting wall 330 is connected to the third limiting wall 350 to form a second step 370. That is, the second limiting wall 340, the first limiting wall 330, and the third limiting wall 350 are connected end to end in sequence to form a stepped structure, so as to provide good guidance for the sliding of the protective frame 300 in this embodiment.

[0058] In addition, this embodiment also provides a gear position identifier on the side wall 130 of the outer frame 100. The gear position identifier is located next to the gear lock. Among them, the lock shape represents the locked gear position, "1" represents the half-knife gear position, and "2" represents the full-knife gear position.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A safety utility knife, characterized in that, It includes an outer frame, a tool rest, a protective frame and a first elastic reset member; The tool rest is fixedly installed in the outer frame. A blade is installed on the tool rest, and at least part of the blade extends outside the tool rest; The protective frame is slidably installed in the outer frame. The protective frame is provided with a protective part extending outside the outer frame. The protective frame can slide from a first position to a second position under the action of an external force. When in the first position, the protective part sleeves the blade. When in the second position, the protective part releases the sleeving of the blade; The first elastic reset member is installed in the outer frame. One end of it is connected to the outer frame, and the other end is connected to the protective frame. The first elastic reset member is used to drive the protective frame to reset from the second position to the first position; A normally closed locking assembly is provided on the top wall of the outer frame. The locking assembly is connected to the protective frame and is used to lock the sliding of the protective frame. When the locking assembly is opened, the protective frame can slide between the first position and the second position under the action of an external force; The locking assembly includes a first button and a second elastic reset member; The first button includes a pressing part and a locking part connected vertically. The pressing part is located outside the outer frame, and the locking part is located inside the outer frame. A first chute is provided on one side of the locking part; The second elastic reset member is located inside the outer frame. One end of it is connected to the pressing part, and the other end is connected to the outer frame. The second elastic reset member is used to drive the pressed first button to reset; The protective frame is provided with a first limit block. The first limit block is in limit cooperation with the locking part to limit the sliding of the protective frame. When the first button is pressed down, the first limit block is in sliding cooperation with the first chute to release the limit on the sliding of the protective frame; It further includes a tool changing assembly. The tool changing assembly is installed on the side wall of the outer frame and is in limit cooperation with the blade. The tool changing assembly can release the limit cooperation with the blade under the action of an external force.

2. The safety utility knife according to claim 1, wherein, An auxiliary pressing structure is further provided on the top wall of the outer frame. The auxiliary pressing structure includes a rod body and a pressing plate connected to each other; One end of the rod body is hinged to the outer frame, and the other end is connected to the pressing plate; The pressing plate and the rod body form an angle with each other. The length and width of the pressing plate are both greater than the length and width of the pressing part. The lower side of the pressing plate is connected to the pressing part.

3. The safety utility knife according to claim 2, wherein Both sides of the pressing plate are provided with side plates, and a receiving groove for receiving the side plates is provided on the side wall of the outer frame.

4. The safety utility knife according to claim 1, wherein, The tool changing assembly includes a second button, a pressing block and a third elastic reset member connected in sequence; The pressing block is provided with a limiting part. A notch for limit cooperation with the limiting part is provided on one side of the blade. When the second button is pressed down, the limiting part can be separated from the notch; The third elastic reset member is used to drive the limiting part to reset into the notch; 5. The safety utility knife according to any one of claims 1-4, characterized in that, A gear lock is installed on the side wall of the tool rest, and the protective frame is provided with a first gear part; When the gear lock is opened and the protective frame slides to a third position between the first position and the second position, the gear lock is in limit cooperation with the first gear portion to lock the sliding of the protective frame towards the second position.

6. The safety utility knife according to claim 5, wherein A second sliding groove is provided on the side wall of the outer frame, and the length direction of the second sliding groove is perpendicular to the length direction of the protective frame. The gear lock includes a second limiting block slidably mounted on the second sliding groove. The first gear portion includes a first limiting wall provided on the side wall of the protective frame. When the second limiting block slides to a preset position and the protective frame slides to the third position, the second limiting block is in limit cooperation with the first limiting wall.

7. The safety utility knife according to claim 6, wherein The protective frame further includes a second gear portion and a third gear portion. The second gear portion includes a second limiting wall, and the third gear portion includes a third limiting wall. The first limiting wall is located between the second limiting wall and the third limiting wall. The second limiting block is located at one end of the second sliding groove. When the protective frame is in the first position, the second limiting wall is in limit cooperation with the second limiting block. The second limiting block is located at the other end of the second sliding groove. When the protective frame is in the second position, the third limiting wall is in limit cooperation with the second limiting block.

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