Variable jaw protection type helmet

Abstract

The variable jaw protection type helmet comprises a helmet shell, a protective cover and a jaw protector, the protective cover is rotationally connected to the helmet shell, and the center of the lower end of the protective cover is connected with an upper locking fastener; the helmet comprises a helmet shell, a jaw guard is rotationally connected to the helmet shell, the center of the upper end of the jaw guard is connected with a movable lower lock catch piece, the lower lock catch piece can be buckled to the upper lock catch piece and can be pressed to be unlocked, one of the upper lock catch piece and the lower lock catch piece is provided with a magnetic attraction piece, and the other one of the upper lock catch piece and the lower lock catch piece is provided with a magnetic attraction part. According to the scheme, unlocking can be achieved by pressing the lower lock catch piece, operation is convenient, the upper lock catch piece and the lower lock catch piece do not need to adopt slope lock catches, and the buckling force is improved; and when the upper lock catch piece and the lower lock catch piece are buckled, the magnetic attraction effect of the magnetic attraction piece and the magnetic attraction part is utilized, the connection stability is kept, accidental unlocking is prevented, and the safety of a user in the riding process is improved.

Description

Technical Field

[0001] The invention relates to the technical field of helmet products, in particular to a variable jaw protection helmet. Background Art

[0002] A variable chin guard helmet refers to a helmet whose chin guard can change its structural position according to riding needs, especially a helmet whose chin guard can switch between a full-face helmet structural position (equivalent to a full-face helmet) and a half-face helmet structural position (equivalent to a half-face helmet). The half-face helmet structural position refers to the state where the chin guard has climbed over the shield (especially the shield in a fully opened state) and crossed the dome of the helmet to the back of the helmet. The biggest advantage of a variable chin guard helmet is that it has both the protective safety of a full-face helmet and the ease of use of a half-face helmet. Therefore, it is safe and reliable to use, and at the same time, it is easy to wear and has a good experience, so it is very competitive in the market.

[0003] In the related art, when the chin guard is in the full helmet structure position, a locking structure is provided between the chin guard and the shield to ensure the stability of the use state. The locking structure can also meet the user's requirement of pushing open the shield and / or chin guard with one hand. Usually, a bevel lock buckle is used. During use, users reported that there is a void position and even accidental unlocking, which affects the safety of riding. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems in the related art. To this end, the present invention provides a variable jaw protection type helmet, which prevents accidental unlocking by improving the locking structure.

[0005] According to an embodiment of the present invention, a variable jaw guard type helmet is provided, comprising a helmet shell, a shield and a jaw guard, wherein the shield is rotatably connected to the helmet shell, and an upper locking fastener is connected to the center of the lower end of the shield; the jaw guard is rotatably connected to the helmet shell, and a movable lower locking fastener is connected to the center of the upper end of the jaw guard, and the lower locking fastener can be fastened to the upper locking fastener and unlocked by pressing, and one of the upper locking fastener and the lower locking fastener is provided with a magnetic attraction member, and the other is provided with a magnetic attraction portion.

[0006] A variable jaw protection helmet according to an embodiment of the present invention has at least the following beneficial effects: In the solution of the present application, the unlocking can be done by pressing the lower locking fastener, which is easy to operate. The upper locking fastener and the lower locking fastener do not need to use inclined locking fasteners, which improves the buckling force. Moreover, when the upper locking fastener and the lower locking fastener are buckled, the magnetic attraction of the magnetic element and the magnetic portion is utilized to maintain the stability of the connection, prevent accidental unlocking, and improve the safety of users during riding.

[0007] According to some embodiments of the present invention, the upper locking fastener is connected with a magnet to form the magnetic attraction part, and the lower locking fastener is a ferrous part or the lower locking fastener is connected with a ferrous part to form the magnetic attraction part.

[0008] According to some embodiments of the present invention, the lower locking fastener is hinged to the jaw guard, and an elastic member is connected to the back surface of the lower locking fastener facing the jaw guard. The elastic member contacts the jaw guard, and under the action of the elastic member, the lower locking fastener is held in a position where it can be fastened to the upper locking fastener.

[0009] According to some embodiments of the present invention, the lower locking fastener includes a pressing member and a locking member. The lower end of the pressing member is hinged to the jaw guard, and the locking member is detachably connected to the upper end of the pressing member.

[0010] According to some embodiments of the present invention, a slot is provided on the back surface of the pressing member, a block is provided on the locking member and is installed in the slot. The contact surface between the block and the inner wall of the slot is an arc surface. An installation post is provided at the lower part of the locking member, and the elastic member is a spring and the spring is sleeved on the installation post.

[0011] According to some embodiments of the present invention, a positioning post is provided on the back surface of the pressing member, a through hole is provided in the middle of the locking member, and the minimum cross-section of the through hole is larger than the cross-section of the positioning post.

[0012] According to some embodiments of the present invention, a first operation part is provided at the upper end of the pressing member, a sliding groove is provided on the jaw guard, and the first operation part passes through the sliding groove and extends to the outside of the jaw guard.

[0013] According to some embodiments of the present invention, an unlocking member is connected to the lower end of the jaw guard, a second operation part is provided at the lower end of the unlocking member, and a linkage mechanism is provided between the unlocking member and the lower locking fastener.

[0014] According to some embodiments of the present invention, the linkage mechanism is a pull ring. A connecting part is provided at the upper end of the unlocking member to connect the lower end of the pull ring, and an action part for cooperating with the pull ring is provided on the lower locking fastener.

[0015] According to some embodiments of the present invention, the action part is a pushing inclined surface provided on the front surface of the lower locking fastener. The upper end of the pull ring contacts the pushing inclined surface. The unlocking member is rotatably connected to the jaw guard. By driving the pull ring to move down through the unlocking member, the pull ring cooperates with the pushing inclined surface to drive the lower locking fastener to disengage from the upper locking fastener.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Description of the Drawings

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein: Figure 1 is a cross-sectional view of a variable jaw guard type helmet according to an embodiment of the present invention; Figure 2 is Figure 1 a partial enlarged view of part A of Figure 3 is a schematic diagram of the connection structure between the guard and the jaw guard in an embodiment of the present invention; Figure 4 is an exploded schematic view of the connection structure of the upper locking fastener, the lower locking fastener and the unlocking member in an embodiment of the present invention Figure 1 ; Figure 5 is an exploded schematic view of the connection structure of the upper locking fastener, the lower locking fastener and the unlocking member in an embodiment of the present invention Figure 2 。

[0018] Description of reference numerals: Helmet shell 100, guard 200, including upper locking fastener 210, magnetic attraction part 211, jaw guard 300, lower locking fastener 310, magnetic attraction member 311, pressing member 312, card slot 3121, positioning post 3122, first operation part 3123, locking member 313, block 3131, mounting post 3132, through hole 3133, pushing inclined surface 314, elastic member 320, unlocking member 330, second operation part 331, pull ring 332, connecting part 333, rotating shaft 334. Detailed Description of the Embodiment

[0019] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention, and should not be construed as a limitation of the present invention.

[0020] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings, and 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.

[0021] In the description of the present invention, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceeding", etc. are understood not to include the recited number, and "above", "below", "within", etc. are understood to include the recited number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0022] In the description of the present invention, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0023] Referring to Figures 1 to 5 , the present invention provides a variable jaw guard helmet, which not only has the function of flexibly adjusting the jaw guard, but also improves the convenience and safety through the innovative design of the locking device.

[0024] The variable jaw guard helmet of the present application mainly includes three main parts: a helmet shell 100, a visor 200, and a jaw guard 300. The helmet shell 100, as the main part of the helmet, is usually made of lightweight and high-strength materials such as carbon fiber or reinforced plastic to ensure the protective performance and wearing comfort of the helmet. The visor 200 is rotatably connected to the front of the helmet shell 100 and is used to block the face and protect the eyes and nose from external factors such as sand, flying objects, etc. The jaw guard 300 is rotatably connected to the lower part of the helmet shell 100 and is used to protect the chin and neck area. The helmet shell 100 has a symmetry plane, and the symmetry plane refers to such a plane ( Figure 1 the cross-sectional plane): when the user wears the helmet normally, the symmetry plane of the helmet shell 100 passes through the user's mouth, nose, and the top of the head and separates the user's eyes and ears on both sides of the symmetry plane, that is, the symmetry plane is a hypothetical plane with the property of bisecting the helmet shell 100.

[0025] The visor 200 is connected to the helmet shell 100 through a rotational connection mechanism (such as a hinge or a rotating shaft), so that the visor 200 can be turned up and down within a certain range, facilitating the user to open or close the visor 200 according to actual needs. At the center position of the lower end of the visor 200 (the position passing through the symmetry plane), an upper locking member 210 is provided. The upper locking member 210 is a member made of metal or plastic, and its shape and size are designed to be compatible with the lower locking member 310 of the jaw guard 300 and achieve locking.

[0026] The jaw guard 300 is also connected to the helmet shell 100 through a rotating connection mechanism, so that the jaw guard 300 can be turned forward and backward within a certain range. A movable lower locking member 310 is provided at the center position of the upper end of the jaw guard 300 (the position passing through the symmetry plane). The lower locking member 310 is a movable member, such as being connected to the jaw guard 300 through a spring or other elastic element, so that the lower locking member 310 can remain in a position of buckling the upper locking member 210 when no external force is applied.

[0027] The upper portion of the lower locking fastener 310 is matched and buckled with the lower portion of the upper locking fastener 210, for example, Figure 2 With the hook lock structure shown, or other structures, when the jaw guard 300 is located in the full-face helmet structure and the shield is in the closed state, the lower lock fastener 310 can be fastened to the upper lock fastener 210 to achieve locking of the jaw guard 300 and the shield 200. In addition, the lower lock fastener 310 can be unlocked by pressing, and the user only needs to press a certain part (such as the top or the middle) of the lower lock fastener 310 to separate the lower lock fastener 310 from the upper lock fastener 210 to achieve unlocking.

[0028] It is understandable that in order to improve the connection stability and safety between the jaw guard 300 and the shield 200, a magnetic attraction structure is provided between the upper locking fastener 210 and the lower locking fastener 310, and the magnetic attraction structure includes a magnetic attraction member 311 and a magnetic attraction portion 211. Specifically, the magnetic attraction member 311 is provided on one of the upper locking fastener 210 and the lower locking fastener 310, and the magnetic attraction portion 211 is provided on the other of the upper locking fastener 210 and the lower locking fastener 310. The magnetic attraction member 311 and the magnetic attraction portion 211 can be magnets or magnetic alloys, and can generate magnetic attraction force between each other, so that the upper locking fastener 210 and the lower locking fastener 310 can be tightly combined when buckled to prevent accidental separation.

[0029] The specific position and shape of the magnetic member 311 and the magnetic portion 211 can be designed according to actual needs. For example, the magnetic member 311 can be set as a small magnet inside the upper locking fastener 210, and the magnetic portion 211 can be set as a magnetic area or component of the lower locking fastener 310 corresponding to the magnetic member 311. When the buckling portion of the lower locking fastener 310 is buckled with the upper locking fastener 210, the magnetic attraction between the magnetic member 311 and the magnetic portion 211 will play a role in auxiliary locking, making the locking state more firm and reliable.

[0030] The variable jaw protection helmet of the present application has the following significant advantages in terms of operational convenience and safety: Easy to operate: The user can unlock the lower locking fastener 310 by a simple pressing action without complicated operating steps or tools, so that the user can quickly and conveniently open the shield 200 or adjust the position of the jaw guard 300 during riding to meet different riding needs.

[0031] Enhanced clamping force: Since magnetic components 311 and magnetic parts 211 are added between the upper locking fastener 210 and the lower locking fastener 310, an additional magnetic attraction force can be generated when the lock is fastened, thereby improving the clamping force. This enables the helmet to better maintain its integrity when subjected to collisions or impacts and prevents accidental unlocking.

[0032] Prevention of accidental unlocking: The magnetic attraction force between the magnetic component 311 and the magnetic part 211 can also effectively prevent abnormal situations such as accidental displacement of the visor 200 and the jaw guard 300. Even when encountering bumps or vibrations during cycling, a stable fastening state can be maintained, enhancing the safety of the user.

[0033] Flexible adjustment: The connection structure between the visor 200 and the jaw guard 300 allows users to flexibly choose to lock or unlock according to actual needs. This provides users with more comfort and convenience, especially during long rides or when frequent head movements are required.

[0034] In some embodiments of the present invention, the upper locking fastener 210 is ingeniously designed to be connected with one or more magnets, which constitute the magnetic part 211. The magnets not only have a strong adsorption force but also can ensure a rapid and stable connection when the jaw guard 300 part of the helmet needs to be adjusted or fixed.

[0035] Meanwhile, the lower locking fastener 310 is made of iron material or has an iron component connected at an appropriate position of the lower locking fastener 310, thereby forming a magnetic component 311 corresponding to the magnets of the upper locking fastener 210. When the lower locking fastener 310 approaches the upper locking fastener 210, a tight connection can be immediately achieved through the adsorption force of the magnets without additional mechanical operations or tool assistance. In practical applications, users can easily adjust the position of the jaw guard 300 according to needs and achieve quick fixation through magnetic attraction, which not only improves the flexibility and convenience of the helmet but also effectively reduces the operation difficulty and enhances the user experience.

[0036] Refer to Figure 1 and Figure 2 , in some embodiments of the present invention, the lower locking fastener 310 is connected to the jaw guard 300 by a hinge. The hinge structure allows the lower locking fastener 310 to rotate relative to the jaw guard 300 within a certain range, facilitating the fastening or separation operation between the lower locking fastener 310 and the upper locking fastener 210.

[0037] An elastic member 320 is connected to the back of the lower locking fastener 310 facing the jaw guard 300. The elastic member 320 is in direct contact with the jaw guard 300 and, under the action of its elastic force, keeps the lower locking fastener 310 in a position where it can be latched onto the upper locking fastener 210. The above design ensures that the lower locking fastener 310 can automatically remain in the locked state without manual operation, thereby improving the stability and safety of the helmet.

[0038] In practical applications, when the user needs to adjust the position of the visor 200 or fix it, simply pressing the lower locking fastener 310 can overcome the elastic force of the elastic member 320, separating the lower locking fastener 310 from the upper locking fastener 210. The operation method is simple and fast, enhancing the user experience.

[0039] Furthermore, based on the above embodiment, the lower locking fastener 310 is designed as a combined structure of a pressing member 312 and a locking member 313. The pressing member 312 and the locking member 313 can be separated, making the structure of the lower locking fastener 310 more flexible and facilitating maintenance and replacement.

[0040] Specifically, the lower end of the pressing member 312 is connected to the jaw guard 300 by a hinged manner, while the locking member 313 is detachably connected to the upper end of the pressing member 312. This enables the locking member 313 to be easily removed from the pressing member 312 as needed, facilitating operations such as cleaning, maintenance, or replacement. When the user needs to unlock, simply pressing the pressing member 312 can separate the locking member 313 from the upper locking fastener 210.

[0041] Refer to Figure 4 and Figure 5 , a slot 3121 is provided on the back of the pressing member 312, while the locking member 313 is provided with a block 3131 installed in the slot 3121. The contact surface between the block 3131 and the inner wall of the slot 3121 is designed as an arc surface, and the inner wall of the slot 3121 can also be an arc surface. The above design enables the locking member 313 to rotate relative to the pressing member 312 within a certain angular range. Even if the jaw guard 300 is deformed due to long-term use or collision, it can still be unlocked at any time, enhancing safety. An installation post 3132 is provided at the lower part of the locking member 313, and the elastic member 320 (such as a spring) is sleeved on the installation post 3132. The above installation method enables the spring to be stably fixed between the locking member 313 and the jaw guard 300, providing continuous elastic force support for the lower locking fastener 310. At the same time, the design of the installation post 3132 also facilitates the replacement and maintenance of the spring. The jaw guard 300 is also provided with a groove to position the spring and prevent the spring from shifting, enhancing the reliability of use.

[0042] Refer to Figure 4 and Figure 5, a positioning post 3122 is further provided on the back surface of the pressing member 312, and a through hole 3133 is provided in the middle of the locking member 313. The positioning post 3122 passes through the through hole 3133, so that the locking member 313 can be guided by the positioning post 3122 during rotation, thereby ensuring that the locking member 313 can accurately cooperate with the card slot 3121. The minimum cross-section of the through hole 3133 is designed to be larger than the cross-section of the positioning post 3122, which not only ensures that the positioning post 3122 can smoothly pass through the through hole 3133, but also enables the locking member 313 to have a certain degree of freedom during rotation. The locking member 313 has a function similar to a seesaw. Even if the position of the pressing member 312 is deviated due to the deformation of the jaw guard 300, the locking member 313 can still accurately latch onto the upper locking fastener 210 to meet the use requirements.

[0043] Furthermore, a first operation portion 3123 is provided at the upper end of the pressing member 312, and the user operates the pressing by operating the first operation portion 3123. The jaw guard 300 is provided with a sliding groove, which can be open or closed. The first operation portion 3123 passes through the sliding groove and extends to the outside of the jaw guard 300, which not only enables the first operation portion 3123 to be exposed within the reach of the user's hand, but also enables the pressing member 312 to be guided by the sliding groove during rotation, thereby ensuring that the pressing member 312 can accurately push the locking member 313. The first operation portion 3123 can be in a bright color for easy user identification, and the first operation portion 3123 is a protruding structure for easy user to find. A blocking convex edge is further provided at the outer end of the first operation portion 3123 to prevent the first operation portion 3123 from completely entering the sliding groove, making the use reliable.

[0044] When the user needs to unlock, just press the first operation portion 3123 with a finger, so that the pressing member 312 rotates and compresses the spring, thereby driving the locking member 313 to separate from the upper locking fastener 210, that is, unlocking is achieved, and the shield 200 can be pushed open. After the user releases the hand, the spring resets, thereby driving the locking member 313 back to the latching position. And when the user needs to lock the jaw guard 300 and the shield 200, just press the first operation portion 3123 again, move the shield 200 to the closed position, and after releasing the hand, the spring pushes the locking member 313 to automatically latch with the upper locking fastener 210. This operation method is not only simple and fast, but also greatly improves the convenience and practicality of the helmet.

[0045] Referring to Figure 3 , in some embodiments of the present invention, an unlocking member 330 is connected to the lower end of the jaw guard 300, and a second operation portion 331 is provided at the lower end of the unlocking member 330, which is a part convenient for the user to press and is used to initiate the unlocking action. In addition, a set of linkage mechanisms is provided between the unlocking member 330 and the lower locking fastener 310, and the unlocking member 330 drives the lower locking fastener 310 through the linkage mechanism, thereby achieving unlocking.

[0046] It is understandable that the linkage mechanism has various structural forms to choose from, such as Figure 4 and Figure 5 As shown, the specific structure of the linkage mechanism can adopt a pull ring 332. The upper end of the unlocking member 330 is provided with a connecting portion 333, and this connecting portion 333 is used to connect the lower end of the pull ring 332. For example, the connecting portion 333 is provided with three staggeredly arranged clamping arms, the clamping arms are L-shaped, and the lower end of the pull ring 332 forms a first cross bar, and the first cross bar passes through the limiting groove formed by the three clamping arms. The pull ring 332 is driven by the unlocking member 330 and can rotate relative to the unlocking member 330, and it is convenient for installation and disassembly. A hook is also provided below the three unlocking members 330, and the pull ring 332 can also be hooked by the hook. Due to the height difference, it is applicable to different lower locking fasteners 310, improving versatility.

[0047] The middle part of the unlocking member 330 is hinged to the jaw guard 300 through a rotating shaft 334. When the user presses the second operation portion 331, the unlocking member 330 rotates and drives the pull ring 332 to move downward. The lower locking fastener 310 is provided with an action portion that cooperates with the pull ring 332, and the movement of the pull ring 332 can effectively be transmitted to the lower locking fastener 310, thereby triggering unlocking.

[0048] The action portion is set as a pushing inclined surface 314 located on the front surface of the lower locking fastener 310. This design cleverly converts the linear motion of the pull ring 332 into the rotational motion of the lower locking fastener 310, thus achieving unlocking. The upper end of the pull ring 332 forms a second cross bar to contact the pushing inclined surface 314. When the user presses the second operation portion 331, the unlocking member 330 drives the pull ring 332 to move downward, and the second cross bar at the upper end of the pull ring 332 slides along the pushing inclined surface 314. This sliding process generates a lateral or downward component force, acting on the lower locking fastener 310, driving it to disengage from the locked state with the upper locking fastener 210.

[0049] It should be noted that the unlocking member 330 is designed to be rotatably connected to the jaw guard 300. When the pull ring 332 exerts a force through the pushing inclined surface 314, the unlocking member 330 can not only transmit this force but also rotate by a certain angle around its rotation axis. This design enhances the flexibility and reliability of the unlocking action. In addition, due to the reaction force of the elastic member 320, the user can feel an obvious feedback when operating the unlocking member 330, which helps to confirm whether the jaw guard 300 has been successfully unlocked.

[0050] In addition, the linkage mechanism can also be a cable. The two ends of the cable are respectively connected to the unlocking member 330 and the lower locking fastener 310. When the user presses the second operation portion 331, the unlocking member 330 drives the lower locking fastener 310 through the cable to complete unlocking. Or, the linkage mechanism is a transmission rod. When the user presses the second operation portion 331, the unlocking member 330 pushes the lower locking fastener 310 through the transmission rod to complete unlocking.

[0051] In actual use, when the user needs to unlock, simply press the second operation part 331 below the jaw guard 300. The second operation part 331 is a protruding structure, which is convenient to find and operate. The unlocking part 330 drives the pull ring 332 to move downward. As the pull ring 332 moves downward, the second cross bar at its upper end slides along the pushing inclined surface 314 on the front surface of the lower locking part 310, so that the lower locking part 310 is pushed to disengage from the contact with the upper locking part 210, realizing unlocking.

[0052] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can also be made without departing from the gist of the present invention.

Claims

1. A variable jaw guard helmet, characterized in that: include: Helmet shell; A shield is rotatably connected to the helmet shell, and a locking fastener is connected to the center of the lower end of the shield; The jaw guard is rotatably connected to the helmet shell, and a movable lower locking fastener is connected to the center of the upper end of the jaw guard. The lower locking fastener can be fastened to the upper locking fastener and unlocked by pressing. One of the upper locking fastener and the lower locking fastener is provided with a magnetic attraction part, and the other is provided with a magnetic attraction part.

2. A variable jaw protection helmet according to claim 1, characterized in that: The upper locking fastener is connected with a magnet to form the magnetic attraction portion, and the lower locking fastener is an iron part or the lower locking fastener is connected with an iron part to form the magnetic attraction part.

3. A variable jaw protection helmet according to claim 1, characterized in that: The lower locking member is hinged to the jaw guard, and an elastic member is connected to the back of the lower locking member facing the jaw guard, and the elastic member contacts the jaw guard. Under the action of the elastic member, the lower locking member is maintained in a position where it can be fastened to the upper locking member.

4. A variable jaw protection helmet according to claim 3, characterized in that: The lower locking member comprises a pressing member and a locking member, the lower end of the pressing member is hinged to the jaw guard, and the locking member is detachably connected to the upper end of the pressing member.

5. A variable jaw protection helmet according to claim 4, characterized in that: A card slot is arranged on the back of the pressing member, and the locking member is provided with a card block mounted on the card slot, the contact surface between the card block and the inner wall of the card slot is an arc surface, a mounting column is arranged at the lower part of the locking member, the elastic member is a spring and the spring is sleeved on the mounting column.

6. A variable jaw protection helmet according to claim 5, characterized in that: A positioning column is arranged on the back of the pressing member, a through hole is arranged in the middle of the locking member, and the minimum cross section of the through hole is larger than the cross section of the positioning column.

7. A variable jaw protection helmet according to claim 4, characterized in that: A first operating portion is disposed at the upper end of the pressing member, and a sliding groove is disposed on the jaw guard. The first operating portion passes through the sliding groove and extends to the outside of the jaw guard.

8. The variable jaw protection helmet according to claim 1, characterized in that: The lower end of the jaw guard is connected with an unlocking member, the lower end of the unlocking member is provided with a second operating portion, and a linkage mechanism is provided between the unlocking member and the lower locking member.

9. A variable jaw protection helmet according to claim 8, characterized in that: The linkage mechanism is a pull ring, the upper end of the unlocking member is provided with a connecting portion to connect with the lower end of the pull ring, and the lower locking member is provided with an action portion cooperating with the pull ring.

10. A variable jaw protection helmet according to claim 9, characterized in that: The action part is a pushing inclined surface arranged on the front side of the lower locking fastener, the upper end of the pull ring contacts the pushing inclined surface, the unlocking member is rotatably connected to the jaw guard, and the pull ring is driven downward by the unlocking member, and the pull ring cooperates with the pushing inclined surface to drive the lower locking fastener to disengage from the upper locking fastener.

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