Rotation structure of chin guard of helmet

Abstract

A rotation structure of a chin guard of a helmet. The rotation structure of a chin guard comprises a helmet main body (12), wherein a face shield (29) and a chin guard (26) are mounted on the helmet main body (12), the face shield (29) is connected to face shield mounting members (31), the chin guard (26) is connected to chin driving assemblies, and an annular linkage guide member (32) is connected between the chin driving assembly and the face shield mounting member (31); the chin guard (26) can be linked with the face shield (29) by means of the chin driving assemblies, the annular linkage guide members (32) and the face shield mounting members (31); when the chin guard (26) is upwardly lifted from below from an original state, the face shield (29) can be upwardly lifted at the same time, and after a lower edge of the chin guard (26) is rotated to a brim portion of a helmet, the face shield (29) can be freely and vertically rotated, and the chin guard (26) can also continue to be backwardly rotated to a final limiting portion; and when the chin guard (26) is rotated to a return position, and when the lower edge of the chin guard (26) is rotated to the brim portion of the helmet, if the face shield (29) is in an upwardly lifted state, the chin guard (26) drives, by means of the annular linkage guide members (32), the face shield (29) to downwardly rotate together and reset to the original state.

Description

Rotating structure of helmet chin guard Technical Field

[0001] The present invention relates to the technical field of human safety protection devices, and more particularly to a helmet for protecting the human head, and more particularly to a helmet having a jaw protection structure, and more particularly to a chin guard, which can be rotated from the chin area of ​​the helmet to the rear of the helmet and can be rotated in conjunction with the face mask. Background Art

[0002] As we all know, users of various motor vehicles, racing cars, racing boats, balance cars, aircraft and even bicycles should wear helmets to protect the safety of their heads when operating the equipment; in addition, in many special work occasions, such as those working in spray painting workshops, firefighting and disaster relief, anti-terrorism and riot control, as well as mining, coal mining, excavation and other harsh environments, they also need to wear helmets to protect their heads from various unexpected injuries. At present, the structural types of helmets mainly include full-face structural helmets and half-face structural helmets. Among them, the full-face structural helmet is equipped with a chin guard that hugs the user's chin, while the half-face structural helmet does not have such a chin guard. As for the full-face structural helmet, because it has a chin guard structure, it can provide better safety protection for the wearer's head; and for the half-face structural head type helmet, because the wearer's mouth, nose and other organs are not restrained by the chin guard, it shows better user comfort.

[0003] Traditional full-face helmets utilize an integrated chin guard and helmet shell, meaning the chin guard is relatively fixed relative to the main shell. While this integrated structure is undoubtedly sturdy and reliable, providing adequate safety and protection for the wearer, it also has drawbacks. First, from a practical perspective, the wearer must remove the helmet before they can perform activities like drinking, talking on the phone, or resting, making this type of helmet inherently awkward and inconvenient. Second, from a production perspective, the large internal cavity with a small notch makes molds very complex, resulting in low production efficiency. This contributes to the high manufacturing cost of integrated full-face helmets.

[0004] Obviously, traditional one-piece full-face helmets cannot meet the multiple requirements of safety, convenience, and low cost. In view of this, developing a helmet that combines the advantages and features of a full-face helmet structure with the advantages and features of a half-face helmet structure has naturally become the goal currently pursued by helmet researchers and manufacturers.

[0005] Chinese patent application CN105901820A proposes a "Gear-Constrained Variable Chin Guard Helmet." The invention's key features lie in the following: a cylindrical gear-type fixed internal gear is positioned on either side of the helmet shell. Two corresponding cylindrical gear-type rotating external gears are secured to the two forks of the chin guard. A corresponding arc-shaped constraint groove is provided on a base fastened to the helmet shell. These constraint grooves constrain the rotating external gear and the fixed internal gear, maintaining meshing and forming a kinematic pair. This constrains the position and posture of the chin guard according to predetermined process requirements, ultimately enabling the chin guard to follow a planned trajectory between a full-face helmet configuration and a half-face helmet configuration, with reversible transitions. In other words, the chin guard can be opened from a full-face helmet configuration to a half-face helmet configuration, and vice versa, as needed. Furthermore, since the chin guard is no longer integral to the helmet shell, the mold for the helmet is simplified, reducing manufacturing costs and improving production efficiency. Obviously, the gear-constrained variable jaw guard structure solution provided by the above patent application can better address the multi-objective requirements of safety, convenience and low cost, thereby promoting the advancement of helmet technology.

[0006] However, although the variable chin guard structure helmet proposed in Chinese patent application CN105901820A has obvious advantages, it requires a long arc-shaped constraint groove with a through-hole characteristic to maintain the meshing relationship between its rotating external gear and the fixed internal gear, and its rotating external gear swings with the chin guard at a large angle, which also brings several disadvantages. Specifically, it is manifested as follows: 1) The long and arc-shaped constraint groove makes the reliability of the helmet a hidden danger. This is because when the chin guard is in the process of changing its position, especially when the chin guard is in a position between the full helmet structure and the half helmet structure, When the helmet is in a flip-up position to form a so-called flip-up helmet (the helmet in this case is a "quasi-half-helmet structure helmet", which is convenient for the wearer to drink water, talk, and temporarily breathe, and is particularly suitable for tunnel work), the jaw guard cannot completely cover the constraint groove, that is, the jaw guard handle cannot effectively cover the through-shaped long arc-shaped constraint groove, resulting in an opportunity for foreign matter to enter the meshing motion pair composed of the rotating external gear and the fixed internal gear. Once this happens, the gear constraint pair is very likely to get stuck. In other words, there are indeed certain risks to the reliability of the helmet during use; ) The presence of the long, arc-shaped constraint grooves also makes the helmet noisy. This is also because the chin guard needs to be in a position between the full helmet structure and the half helmet structure during the process of changing its position, forming a so-called flip-up helmet. For the rider, the chin guard cannot completely cover the constraint grooves, causing the whistling sound generated by the external airflow flowing through the outer surface of the helmet to be easily transmitted into the interior of the helmet through the through-shaped constraint grooves. It is noted that these constraint grooves are arranged near the wearer's two ears, so the sound insulation effect of the helmet is poor or its comfort is poor; 3) The external gear that rotates like a planet The layout and operation mode weaken the safety of the helmet to a certain extent. This is because when the jaw guard changes its structural position, the external gear moves with the jaw guard and exhibits a planetary rotation behavior. It is not difficult to find that the spatial area it sweeps is relatively large. In the spatial area where the external gear rotates, it is obviously impossible to arrange fastening screws or other fastening structures. At this time, the base with a long arc constraint groove will be forced to be arranged into a thin shell-like component with a larger span. It is well known that the intrinsic stiffness of components in this structural form is relatively small, which means that the stiffness of the helmet shell is weaker. In other words, the safety of the helmet is weakened.

[0007] In addition, Chinese patent CN 210124365 U discloses a gear-constrained variable jaw guard structure helmet. It includes a helmet shell body, a jaw guard, and a fork handle on the jaw guard. The base, fork handle, internal gear, external gear, and transmission element form a linkage mechanism. The internal and external gears rotate on fixed axes and form a meshing constraint pair. The internal gear and fork handle slide together to form a sliding constraint pair. The transmission element transmits the motion of the external gear to the fork handle, causing the jaw guard to produce telescopic displacement relative to the helmet shell body. This achieves both a tilting motion of the jaw guard and a reciprocating motion, thereby enabling the jaw guard to switch between a full-face and a half-face position. Because the fork handle can cover the slot on the internal gear during the jaw guard's tilting process, it prevents foreign matter from entering the gear pair, ensuring the helmet's reliability and blocking external noise from entering the helmet, improving the helmet's comfort. The fixed-axis rotating gear occupies less space, creating conditions for increasing the rigidity of related components, thereby improving the helmet's safety. However, the structure of the helmet is very complicated, which makes it difficult to manufacture and use. In addition, the helmet is heavy, has high manufacturing costs, a short service life, and is easily damaged.

[0008] Chinese patent CN111264968A also discloses a chin guard positioning assembly and a helmet having the same. The assembly connects a helmet body that covers the user's head and a chin guard. The chin guard moves from a protective position to an open position or vice versa. The assembly includes: a movable base portion connected to the chin guard and capable of moving with the chin guard; a fixed base portion connected to the helmet body and the movable base portion, serving as a reference for the movable base portion's movement; a fixed magnetic portion fixed to the fixed base portion; and a movable magnetic portion that interacts with the fixed magnetic portion to secure the movable base portion to a first or second position. This helmet also suffers from complex structural design, making it difficult to manufacture and use. Furthermore, it is heavy, expensive to manufacture, has a short service life, and is easily damaged.

[0009] In summary, there is still room for further improvement and enhancement of the existing helmets with variable jaw guard structures. Summary of the Invention

[0010] The purpose of the present invention is to overcome the defects of the prior art and provide a helmet with a simple structure, a small number of parts, simple processing and manufacturing, easy use, a long service life, and a light overall weight, which can realize the rotation structure of the upper and lower chin guards of the helmet in which the chin guard and the mask are linked.

[0011] To achieve the aforementioned objectives, the present invention employs the following technical solution: a rotating structure for a helmet chin guard, comprising a driving gear, a driven gear, a rotating component mounting plate, and a first rotating shaft. The rotating component mounting plate is provided with a C-shaped guide groove, and a through-hole is provided in a mounting plate housing enclosed by the C-shaped guide groove. The driving gear meshes with the driven gear, which is fixedly mounted near one end of the C-shaped guide groove in the rotating component mounting plate via a fixed shaft. The center of the driving gear has a stepped hole that mates with the first rotating shaft, and the first rotating shaft passes through the stepped hole and the through-hole to connect to the helmet body. Because the chin guard is mounted to the side of the driving gear, when the chin guard is rotated, the driving gear rotates about the first rotating shaft, while simultaneously meshing with the driven gear. The driven gear is mounted to the rotating component mounting plate via a fixed shaft, and the rotating component mounting plate is mounted to the helmet body. The gear transmission structure is designed to ensure smoother rotation of the chin guard and extend its service life.

[0012] In order to facilitate the guidance and limitation of the movement trajectory of the side protrusions, to facilitate the installation of the chin guard rotating component on the rotating component mounting plate, and at the same time to minimize the structural size and weight of the rotating component mounting plate, the preferred technical solution is that the driving gear is an incomplete gear. Since the rotation range of the chin guard is about 250 degrees, the driving gear does not need to be made into a complete gear. The incomplete gear is provided with a protrusion on the annular surface without teeth, and the protrusion is provided with a radial positioning groove. This positioning groove is used to limit the chin guard to stop rotating after it rotates to a certain position. The side of the protrusion facing the rotating component mounting plate is provided with a side protrusion protruding from the driving gear. The side protrusion is slidably matched with the C-shaped guide groove. The side protrusion is used to guide the driving gear to rotate along the range of the C-shaped guide groove, and can ensure the parallelism of the driving gear and the driven gear. The gear train is fixed to the gear unit and is secured to the gear train by means of a plurality of locking members, the plurality of locking members are secured to the gear train and are secured to the gear train when the gear train is in motion.

[0013] In order to couple the chin guard with the rotating structure of the chin guard, a chin guard plug-in slot and a connecting hole are provided on the annular surface between the driving teeth and the stepped hole of the driving gear. The plug-in slot is used to insert the plug-in teeth protruding on the inner side of the chin guard, and the connecting hole is used to fix the chin guard to the driving gear with screws, so that the driving gear can rotate when the chin guard is rotated.

[0014] In order to facilitate the connection between the chin guard and the chin guard rotating component, and at the same time be able to connect the chin guard rotating component with the inner component, for example, the inner component can be a driving block for realizing the linkage between the chin guard and the mask, and at the same time in order to minimize the structural size of the chin guard mounting component and reduce the weight of the chin guard mounting component, a preferred technical solution is that the connecting groove is provided on the inner side of the driving gear facing the chin guard, and the side of the chin guard facing the driving gear is provided with a connecting tooth compatible with the connecting groove, and the chin guard is also provided with a mounting hole corresponding to the connecting hole, and fasteners (screws) are installed in the connecting hole and the mounting hole.

[0015] To securely connect the drive gear to the rotating component mounting plate, the first rotating shaft is a hollow shaft. The hollow shaft is designed to facilitate the insertion of a fixing screw through its center. The hollow shaft allows the drive gear to rotate on the hollow shaft, rubbing against the outer surface of the hollow shaft without rubbing against the fixing screw, which could loosen the fixing screw. One end of the first rotating shaft is provided with an end cap that mates with a stepped hole. The end cap is configured to engage with the screw cap. The other end of the first rotating shaft is provided with a radial groove that mates with a bump on a boss within the helmet mounting slot, preventing the first shaft from rotating. The other end of the first rotating shaft passes through the stepped hole and engages with a bump provided on the helmet body. The hollow shaft of the first rotating shaft is connected to the mounting hole on the helmet body via a fastener. If other components are provided on the inner side of the rotating component mounting plate, such as a drive block for achieving linkage between the chin guard and the visor, the first rotating shaft may also be a through-hole extending through the other component. The bump may be provided on a boss within the helmet body mounting slot.

[0016] To further couple the drive gear to the inner component of the rotating component mounting plate, a groove is provided on the annular surface of the drive gear between the drive tooth and the stepped hole. For example, the inner component may be a drive block for coupling the chin guard and face mask. If the drive block has raised teeth, the groove engages with the raised teeth. The groove on the other annular surface of the drive gear is designed to interlock with the raised teeth on the drive block. This allows the drive gear to rotate when the chin guard rotates, and the drive block can also rotate with it.

[0017] In order to facilitate guiding and limiting the motion trajectory of the drive block and facilitating the installation of the chin guard rotating component on the rotating component mounting plate, and at the same time to minimize the structural size and weight of the rotating component mounting plate, a further preferred technical solution is that the rotating component mounting plate is a D-shaped shell structure. The rotating component mounting plate is made into a D-shaped shell structure mainly so that one side of the rotating component mounting plate can accommodate the lower linkage guide ring and the mask mounting component, and the other side is convenient for connection with the chin guard. The D-shaped shell structure is provided with a flange on the side facing the mounting groove. The function of the flange is to form a cavity for accommodating the linkage guide ring and the driving block between the rotating component mounting plate and the mounting groove of the helmet body; wherein the flange on the vertical straight side of the D-shaped shell structure is a stepped flange, which is used for rotating the mask mounting component. A through hole for the first rotating shaft to pass through is provided on the D-shaped shell surrounded by the C-shaped guide groove. A mounting hole is also provided on the rotating component mounting plate of the D-shaped shell structure. The mounting hole is used to mount the rotating component mounting plate on the helmet body with screws, and the mounting hole fixes the rotating component mounting plate to the mounting groove by fasteners.

[0018] In addition, the present invention provides a helmet comprising any of the above-mentioned rotating structures for the chin guard of the helmet.

[0019] In order to ensure that the chin guard and the visor are stably mounted on the helmet body, and enable the chin guard and the visor to be flexibly rotated on the helmet body and to stop at the set position, a further preferred technical solution is that the visor and the chin guard are symmetrically hinged on both sides of the helmet body through the visor rotation structure and the chin guard rotation structure respectively, and mounting grooves are symmetrically provided on both sides of the helmet body, and the visor rotation limiter and the rotating component mounting plate are installed in the mounting grooves, and the mask mounting member in the mask rotating component is installed on the inner side of the rotating component mounting plate, and the mask is connected to one end of the linkage guide ring through the mask mounting member, and the linkage guide ring is hinged to the rotating component mounting plate through the second rotating shaft, and a driving block that cooperates with the inner side of the annular groove is provided in the annular groove on the linkage guide ring, and the driving block passes through the rotating component mounting plate through the first rotating shaft and is connected to the chin guard rotating structure arranged on the outer side of the rotating component mounting plate, and the chin guard rotating structure is connected to the rotating component mounting plate and the chin guard respectively. The mutual cooperation between the linkage guide ring and the driving block can realize the linkage of the chin guard and the mask, and the independent rotation of the mask.

[0020] In order to facilitate hiding the mask rotating component and the chin guard rotating component inside the helmet body so that they are not damaged and at the same time achieve an aesthetically pleasing appearance, a preferred technical solution is that the mounting grooves are symmetrically arranged on both sides of the helmet body and are respectively arranged as inwardly concave grooves, and the grooves have a two-layer stepped groove structure. The reason why the grooves are arranged in a stepped structure is that the linkage guide ring and the mask rotation limiter installed in the grooves are components with a two-layer structure, and the two layers of grooves are respectively the mask rotation limiter mounting groove located on the second layer and the rotation component mounting plate mounting groove located on the first layer. The shape of the mask rotation limiter mounting groove is adapted to the shape of the mask rotation limiter, and the shape of the rotation component mounting plate mounting groove is adapted to the shape of the rotation component mounting plate.

[0021] In order to facilitate the driving of the driving block through the chin guard and the chin guard rotating component, the driving linkage guide ring is driven to rotate around the second rotating shaft, and the fixed driving mask is rotated together, the preferred technical solution is that the driving block is a triangular sheet body, the center of the triangular sheet body is provided with a through hole, and the triangular sheet body is provided with a convex tooth on the periphery of the through hole facing the rotating component mounting plate. The convex tooth is used to be inserted into the groove on the annular surface on the other side of the driving gear, so that the moving gear drives the driving block to rotate together.

[0022] In order to effectively limit the rotation range of the mask and at the same time prevent the mask from automatically sliding down after rotating to a predetermined position, or from swinging up and down due to vibration and bumping of the helmet body when the helmet is worn, a preferred technical solution is that the mask rotation limiter includes a strip slider and a strip rod. The ends of the strip rod are connected to the mounting groove by fasteners. One side of the strip rod is connected to the strip slider by an elastic member. One side of the strip slider is provided with an arc groove for positioning the mask. The arc groove is provided with multiple arc grooves with different curvature radii to form a toothed arc limiting guide groove. The strip rod and the strip slider are respectively shell structures, and the concave side of the strip rod and the strip slider faces the mounting groove. This structure is used to limit the mask to stay in any position without automatically sliding down or sliding down due to bumping of the helmet. Since the mask is mounted on the mask mounting member, which is in turn connected to the linkage guide ring, a cylindrical projection is provided on one side of the linkage guide ring. The cylindrical projection is engaged with the multiple arc-shaped grooves of different curvature radii of the strip slider. When the mask moves up and down to different positions, the cylindrical projection is engaged with the multiple arc-shaped grooves of different curvature radii of the strip slider. Moreover, the strip slider can press the cylindrical projection under the elastic force of the spring. Pressing the cylindrical projection limits the rotation of the mask mounting member, that is, limits the rotation of the mask. The elastic force of the spring alone cannot limit the rotation of the mask pushed by hand.

[0023] In order to facilitate the connection between the mask and the linkage guide ring and simplify the installation process, a preferred technical solution is that the linkage guide ring is a C-shaped open ring structure, one end of the linkage guide ring of the C-shaped open ring structure is connected to the mask mounting member, and a columnar protrusion is provided near the connection portion, facing the mounting groove. The columnar protrusion cooperates with the arc-shaped groove to form a limit for the mask; a first mounting hole for a second rotating shaft is provided near the other end of the C-shaped open ring linkage guide ring, and a second mounting hole for the second rotating shaft is provided on the rotating component mounting plate. The second rotating shaft is used to mount the linkage guide ring and the mask mounting member on the rotating component mounting plate through the first mounting hole, the second mounting hole and the fastener, and enables the linkage guide ring and the mask mounting member to rotate on the rotating component mounting plate around the second rotating shaft. The second rotating shaft is a component for the linkage guide ring and the mask mounting member to rotate around it, and the linkage guide ring and the mask mounting member are rotated under the drive of the driving block. When the chin guard is pushed to rotate by hand, the chin guard drives the driving gear to rotate, and the driving gear drives the driving block to rotate. The triangle of the driving block presses the inner side of the C-shaped open ring of the linkage guide ring, driving the rotation of the linkage guide ring. Since the inner side of the C-shaped open ring of the linkage guide ring has different curved surface segments, the chin guard can be linked to the mask, or the mask can be rotated alone.

[0024] In order to minimize the structural size of the linkage guide ring, reduce the weight of the linkage guide ring, facilitate the connection between the linkage guide ring and the rotating component mounting plate, and facilitate the rotation of the mask around the second rotating axis and be able to stay in a predetermined position without slipping, the preferred technical solution is that the mask mounting part is a strip-shaped arc surface structure, the outer arc surface side of the strip-shaped arc surface is used to connect with the mask, and the inner arc surface side of the strip-shaped arc surface is used to connect with the linkage guide ring, or the mask mounting part and the linkage guide ring form an integral structure, the strip-shaped arc surface is provided with a slot and / or a convex edge on the outer arc surface side for connecting with the mask, and the width of the strip-shaped arc surface is greater than the width of the linkage guide ring.

[0025] Compared to helmets with the same or similar performance as those disclosed in the aforementioned background art, the rotational structure of the chin guard of this helmet significantly simplifies the various connecting components and drive wheel structures for rotating the chin guard and visor. The number of components is reduced to 1 / 3 to 1 / 5 of the number of components used to install and drive the chin guard and visor in existing similar helmets. The complexity of each component is also greatly simplified, significantly improving the performance of the helmet. Due to the small number of components and the relatively simple structure of each component, the manufacturing cost of this helmet is reduced, the reliability of use is improved, the service life is extended, and the assembly and disassembly of the helmet is more convenient. The opening and closing of the chin guard and visor during use is also more convenient, faster, and more stable. The chin guard of the present invention can realize the linkage between the chin guard and the mask through the chin drive assembly, the linkage guide ring and the mask mounting part. When the chin guard is lifted from the bottom to the top from the original state, the mask can be lifted upward at the same time. After the lower edge of the chin guard is rotated to the brim of the helmet, the mask can be freely rotated up and down, and the chin guard can continue to rotate backward to the final limit position; when the chin guard is rotated to the return position, when the lower edge of the chin guard is rotated to the brim of the helmet, if the mask is in the upward lifted state, the chin guard will drive the mask to rotate downward together through the linkage guide ring to return to the original state. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a schematic diagram of the three-dimensional structure of a helmet with a rotating structure of a chin guard of a helmet according to the present invention;

[0027] FIG2 is a schematic diagram of an exploded structure of a connecting structure on one side of a rotating structure of a helmet chin guard according to the present invention;

[0028] FIG3 is a partial enlarged view of the connection structure of FIG2 of the present invention;

[0029] FIG4 is a schematic structural diagram of the outer side of the mounting plate of the rotating component in the initial state in the working principle of the rotating structure of the chin guard of the helmet according to the present invention;

[0030] FIG5 is a schematic structural diagram of the inner side of the mounting plate of the rotating component in the initial state according to the working principle of the rotating structure of the chin guard of the helmet of the present invention;

[0031] FIG6 is a schematic structural diagram of the outer side of the mounting plate of the rotating component in a state where the chin guard drives the face mask to be lifted up simultaneously in the working principle of the rotating structure of the chin guard of the helmet of the present invention;

[0032] FIG7 is a schematic structural diagram of the inner side of the mounting plate of the rotating component in a state where the chin guard drives the face mask to be lifted up simultaneously in the working principle of the rotating structure of the chin guard of the helmet of the present invention;

[0033] FIG8 is a schematic structural diagram of the inner side of the mounting plate of the rotating component in the working principle of the rotating structure of the chin guard of the helmet of the present invention, in which the chin guard drives the face mask to be lifted up simultaneously to the end of rotation;

[0034] FIG9 is a schematic structural diagram of the inner side of the mounting plate of the rotating component, showing the working principle of the rotating structure of the chin guard of the helmet of the present invention, in which the chin guard drives the face mask to be lifted up simultaneously to the end of the rotation;

[0035] FIG10 is a schematic structural diagram of the outer side of the mounting plate of the rotating component in the state where the chin guard continues to rotate backward after the upward rotation of the face mask is terminated in the working principle of the rotating structure of the chin guard of the helmet of the present invention;

[0036] FIG11 is a schematic structural diagram of the inner side of the mounting plate of the rotating component in the state where the chin guard continues to rotate backward after the upward rotation of the face mask is terminated in the working principle of the rotating structure of the chin guard of the helmet of the present invention;

[0037] FIG12 is a schematic structural diagram of the outer side of the mounting plate of the rotating component in the working principle of the rotating structure of the chin guard of the helmet of the present invention, in a state where the chin guard also rotates backward to the end point after the upward rotation of the face mask is terminated;

[0038] FIG13 is a schematic diagram illustrating the structure of the inner side of the mounting plate of the rotating component in the state where the chin guard rotates backward to the end point after the upward rotation of the face mask is terminated in the working principle of the rotating structure of the chin guard of the helmet of the present invention;

[0039] FIG14 is a schematic structural diagram of the inner side of the mounting plate of the rotating component in the working principle of the rotating structure of the chin guard of the helmet of the present invention, in a state where the chin guard rotates backward to the end point and then rotates downward to the end point and then starts to rotate upward;

[0040] FIG15 is a schematic structural diagram of the inner side of the mounting plate of the rotating component during the working principle of the rotating structure of the chin guard of the helmet of the present invention, when the chin guard begins to rotate forward and the face shield rotates upward;

[0041] FIG16 is a schematic structural diagram of the inner side of the mounting plate of the rotating component when the chin guard begins to rotate forward and the face shield reaches its end point in the working principle of the rotating structure of the chin guard of the helmet of the present invention;

[0042] FIG17 is a schematic structural diagram of the inner side of the mounting plate of the rotating component when the chin guard begins to rotate forward to the end point and the face shield rotates upward to the end point in the working principle of the rotating structure of the chin guard of the helmet of the present invention;

[0043] FIG18 is a schematic diagram of the inner structure of the chin guard of FIG1 in the rotation structure of the chin guard of the helmet of the present invention.

[0044] Figure: 1, driving gear; 2, driven gear; 3, fixed shaft; 4, rotating component mounting plate; 5, C-shaped guide groove; 6, first rotating shaft; 7, stepped hole; 8, end cap; 9, radial groove; 10, driving block; 11, through hole; 12, helmet body; 12.1, fastener; 13, mounting groove; 14, boss; 15, bump; 16, mounting hole; 17, plug-in slot; 18, connecting hole; 19, convex tooth; 20, groove; 21, bump; 22, radial positioning groove; 23, radial positioning slider; 2 4. Radial positioning groove; 25. Elastic member; 26. Chin guard; 27. Connecting tooth; 28. Mounting hole; 29. ​​Mask; 30. Mask rotation limiter; 31. Mask mounting member; 32. Linkage guide ring member; 33. Second rotating shaft; 34. Annular groove; 35. Through hole; 36. Mounting hole; 37. Fastener; 38. Strip slider; 39. Fastener; 40. Elastic member; 41. Strip rod; 42. Columnar protrusion; 43. Arc-shaped groove; 44. First mounting hole; 45. Second mounting hole.

[0045] Wherein: the rotating parts of the chin guard include: 1. driving gear; 2. driven gear; 6. first rotating shaft;

[0046] The mounting parts of the rotating part of the chin guard include: 3. fixed shaft; 4. rotating part mounting plate; 8. end cap; 12.1. fastener; 37. fastener;

[0047] The chin guard rotation limiter and the limiter structure include: 21, a protrusion; 22, a radial positioning groove; 23, a radial positioning slider; 24, a radial positioning slide groove; 25, an elastic member;

[0048] The mounting structure of the chin guard rotating member includes: 5, C-shaped guide groove; 7, stepped hole; 8, end cap; 9, radial groove; 11, through hole; 13, mounting groove; 14, boss; 15, bump; 16, mounting hole; 17, plug-in groove; 18, connecting hole; 19, protruding tooth; 20, groove; 27, plug-in tooth; 28, mounting hole; 35, through hole; 36, mounting hole;

[0049] The linkage components and mounting structure of the chin guard and the mask include: 10, driving block; 32, linkage guide ring; 33, second rotating shaft; 34, annular groove; 44, first mounting hole; 45, second mounting hole;

[0050] The mask mounting parts include: 31, mask mounting parts;

[0051] The limiting parts of the mask include: 30, the mask rotation limiting part, 38, the strip slider, 39, the fastener; 40, the elastic part, 41, the strip rod, 42, the columnar protrusion, 43, the arc groove; DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0053] As shown in Figures 1 to 18, the present invention is a rotation structure of a helmet chin guard, which includes a driving gear 1, which is engaged with a driven gear 2. The driven gear 2 is fixedly mounted near one end of a C-shaped guide groove 5 of a rotating component mounting plate 4 through a fixed shaft 3. The center of the driving gear 1 is provided with a stepped hole 7 that cooperates with a first rotating shaft 6. The first rotating shaft 6 is a hollow shaft. One end of the first rotating shaft 6 is provided with an end cap 8 that cooperates with the stepped hole 7. The other end of the first rotating shaft 6 is provided with a radial groove 9. The other end passes through the stepped hole 7 and the through hole 11 on the driving block 10 and cooperates with a protrusion 15 on a boss 14 in the mounting groove 13 on the helmet body 12. The hollow shaft of the first rotating shaft 6 is connected to the mounting hole 16 on the boss 14 through a fastener 12.1; the annular surface between the driving tooth of the driving gear 1 and the stepped hole 7 is provided with a plug-in groove 17 and a connecting hole 18 for the chin guard 26, and the other side annular surface between the driving tooth of the driving gear 1 and the stepped hole 7 is provided with a groove 20 that engages with the convex tooth 19 on the driving block 10.

[0054] Because the chin guard 26 is mounted on the side of the driving gear 1, when the chin guard 26 is rotated, the driving gear 1 rotates about the first rotating shaft 6, and simultaneously engages with the driven gear 2. The driven gear 2 is mounted on the rotating component mounting plate 4 via the fixed shaft 3, and the rotating component mounting plate 4 is mounted on the helmet body 12. The use of a gear transmission structure ensures smoother rotation of the chin guard 26 and prolongs its service life.

[0055] In order to facilitate the guidance and limitation of the motion trajectory of the side block 10, to facilitate the installation of the chin guard 26 rotating component on the rotating component mounting plate 4, and at the same time to minimize the structural size and weight of the rotating component mounting plate 4, a preferred embodiment of the present invention is that the driving gear 1 is an incomplete gear. Since the rotation range of the chin guard 26 is about 250 degrees, the driving gear 1 does not need to be made into a complete gear. The incomplete gear is provided with a protrusion 21 on the annular surface without teeth, and the protrusion 21 is provided with a radial positioning groove 22. This positioning groove 22 is used to limit the chin guard 26 to stop rotating after rotating to a certain position. The protrusion 21 is provided with a side protrusion protruding from the driving gear 1 on the side facing the rotating component mounting plate 4. The side protrusion is slidably matched with the C-shaped guide groove 5. The side protrusion is used to guide the driving gear 1 to rotate along the range of the C-shaped guide groove, and can ensure that the driving gear 1 The radial positioning slide 23 is connected to the rotating component mounting plate 4, and the radial positioning groove 22 on the driving gear 2 is engaged with the radial positioning slide 23. That is to say, after the positioning groove 22 on the driving gear 1 is rotated to the position of the radial positioning slide 23, it will be stuck by the radial positioning slide 23 and can no longer rotate. The radial positioning slide 23 and the radial positioning slide 24 slide with each other. The radial positioning slide 23 is a long slider, the upper end of which is used to limit the rotation of the driving gear 1 and slide in the radial positioning slide 24 below. The radial positioning slide 24 is installed on the inner side of the rotating component mounting plate 4 through a fastener. One end of the radial positioning slide 23 passes through the rotating component mounting plate 4 and is located on the outer side of the rotating component mounting plate 4. An elastic member 25 is provided between the radial positioning slide 23 and the radial positioning slide 24.

[0056] In order to facilitate the connection between the chin guard 26 and the chin guard rotating component, and to be able to connect the chin guard 26 rotating component and the driving block 10, and to minimize the structural size of the chin guard mounting component and reduce the weight of the chin guard mounting component, a preferred embodiment of the present invention is that the connecting groove 17 is provided on the inner side of the driving gear 1 facing the chin guard 26, and a connecting tooth 27 adapted to the connecting groove 17 is provided on the inner side of the chin guard 26. The chin guard 26 is also provided with a mounting hole 28 corresponding to the connecting hole 18, and fasteners (screws) are installed in the connecting hole 18 and the mounting hole 28.

[0057] In order to ensure that the driving gear 1 is firmly connected to the rotating component mounting plate 4, the first rotating shaft 6 is a hollow shaft. The hollow shaft is for facilitating the fixing screw 12.1 to pass through the center of the hollow shaft. The function of the hollow shaft is to enable the driving gear 1 to rotate on the hollow shaft and rub against the outer surface of the hollow shaft without rubbing against the fixing screw 12.1, causing the fixing screw 12.1 to loosen; one end of the first rotating shaft 6 is provided with an end cap 8 that cooperates with the stepped hole 7, and the end cap 8 is used to cooperate with the screw 12.1 cap. The other end of the first rotating shaft 6 is provided with a radial groove 9, which is a card groove for cooperating with a protrusion 15 on a boss 14 in the mounting groove 13 on the helmet. It is a structure for preventing the first shaft 6 from rotating. The other end of the first rotating shaft 6 passes through the stepped hole 7 and cooperates with the protrusion 15 provided on the helmet body 12. The hollow shaft of the first rotating shaft 6 is connected to the mounting hole 16 on the helmet body 12 through a fastener 12.1. When other components are provided on the inner side of the rotating component mounting plate 4, such as a driving block 10 for realizing the linkage between the chin guard 26 and the mask 29, the first rotating shaft 6 can also be a through hole 11 passing through other components; the protrusion 15 can be a boss 15 arranged in the helmet body mounting groove 13.

[0058] To further couple the drive gear 1 with the inner component of the rotating component mounting plate 4, a groove 17 is provided on the annular surface of the drive gear 1 on the other side between the drive tooth and the stepped hole 7. For example, the inner component may be the drive block 10 used to achieve linkage between the chin guard 26 and the face mask 29. When the drive block 10 is provided with a protruding tooth 19, the groove 20 engages with the protruding tooth 19. The groove 20 on the other side of the annular surface of the drive gear 1 is designed to interlock with the protruding tooth 19 provided on the drive block 10. As a result, when the chin guard 26 drives the drive gear 1 to rotate, the drive gear 1 can also drive the drive block 10 to rotate together.

[0059] In order to ensure that the chin guard 26 and the face mask 29 are stably mounted on the helmet body 12, and that the chin guard 26 and the face mask 29 can be flexibly rotated on the helmet body 12 and can stop at a set position, a further preferred embodiment of the present invention is that the face mask 29 and the chin guard 26 are symmetrically hinged on both sides of the helmet body 12 through a face mask rotating structure and a chin guard rotating structure, and mounting grooves 13 are symmetrically provided on both sides of the helmet body 12, and a face mask rotation limiter 30 and a rotating component mounting plate 4 are installed in the mounting groove 13, and the rotating component mounting plate 4 is installed in the rotating component mounting plate 4. A mask mounting member 31, part of the mask rotating assembly, is mounted on the inner side of plate 4. The mask 29 is connected to one end of a linkage guide ring member 32 via the mask mounting member 31. The linkage guide ring member 32 is hinged to the rotating assembly mounting plate 4 via a second rotation axis 33. An annular groove 34 on the linkage guide ring member 32 houses a driver block 10 that engages with the inner side of the annular groove 34. The driver block 10 passes through the rotating assembly mounting plate 4 via a first rotation axis 6 and is connected to the chin guard rotating structure disposed on the outer side of the rotating assembly mounting plate 4. The chin guard rotating structure is connected to the rotating assembly mounting plate 4 and the chin guard 26, respectively. The interaction between the linkage guide ring member 32 and the driver block 10 enables the linkage of the chin guard 26 and the mask 29, as well as independent rotation of the mask 29.

[0060] In order to facilitate hiding the mask rotating component and the chin guard rotating component inside the helmet body 12 so that they are not damaged and at the same time achieve an aesthetically pleasing appearance, a preferred embodiment of the present invention is that the mounting grooves 13 are symmetrically arranged on both sides of the helmet body 12, and are respectively arranged as inwardly recessed grooves, and the grooves have a two-layer stepped groove structure. The reason why the grooves are arranged as a stepped structure is that the linkage guide ring 23 and the mask rotation limiter 30 installed in the grooves are components with a two-layer structure, and the two layers of grooves are respectively the mask rotation limiter 30 mounting groove 13 located on the second layer and the rotating component mounting plate 4 mounting groove located on the first layer. The shape of the mask rotation limiter 30 mounting groove 13 is adapted to the shape of the mask rotation limiter 30, and the shape of the rotating component mounting plate 4 mounting groove is adapted to the shape of the rotating component mounting plate 4.

[0061] In order to facilitate the driving block 10 to be driven together through the chin guard 26 and the chin guard rotating component, the driving linkage guide ring 32 is driven to rotate around the second rotating shaft 33 and the fixed driving mask is rotated together, a preferred embodiment of the present invention is that the driving block 10 is a triangular sheet body, and a through hole 11 is provided in the center of the triangular sheet body. A convex tooth 19 is provided on the periphery of the through hole 11 on the side of the triangular sheet body facing the rotating component mounting plate 4. The convex tooth 19 is used to be inserted into the groove 20 on the annular surface on the other side of the driving gear 1, so that the movable gear 19 drives the driving block 10 to rotate together.

[0062] In order to facilitate the guidance and limitation of the motion trajectory of the driving block 10, it is convenient to install the chin guard rotating component on the rotating component mounting plate 4, and at the same time to minimize the structural size and weight of the rotating component mounting plate 4, a further preferred embodiment of the present invention is that the rotating component mounting plate 4 is a D-shaped shell structure. The rotating component mounting plate 4 is made into a D-shaped shell structure, mainly so that one side of the rotating component mounting plate 4 can accommodate the lower linkage guide ring 23 and the mask mounting member 31, and the other side is convenient for linking with the chin guard 26, and the D-shaped shell structure faces one side of the mounting groove 13. It is provided with a flange, and the stepped flange is used for rotational guidance of the mask mounting part 31, wherein the flange on the vertical straight side of the D-shaped shell structure is a stepped flange, and a C-shaped guide groove 5 is provided on the rotating part mounting plate 4 of the D-shaped shell structure, and a through hole 35 for the first rotating shaft 6 to pass through is provided on the D-shaped shell surrounded by the C-shaped guide groove, and a mounting hole 36 is also provided on the rotating part mounting plate 4 of the D-shaped shell structure. The mounting hole 36 is used to mount the rotating part mounting plate 4 on the helmet body 12 with a screw 37, and the mounting hole 36 fixes the rotating part mounting plate 4 on the mounting groove 13 through a fastener 37.

[0063] In order to effectively limit the rotation range of the visor 29 and prevent the visor 29 from automatically sliding down after being rotated to a predetermined position, or from swinging up and down due to vibration and bumps of the helmet body when the helmet is worn, a preferred embodiment of the present invention further comprises a visor rotation limiter 30 comprising a strip slider 38 and a strip rod 41. The strip rod 41 is connected to the mounting slot 13 near both ends by fasteners 39. One side of the strip rod 41 is connected to the strip slider 38 by an elastic member 40. One side of the strip slider 38 is provided with an arcuate groove 43 for positioning the visor 29. The arcuate groove 43 is provided with multiple arcuate grooves with different curvature radii to form a toothed arcuate limiting guide groove. The strip rod 41 and the strip slider 38 are respectively shell structures, and the concave side of the strip rod 41 and the strip slider 38 faces the mounting slot 13. This structure is used to limit the visor 29 to stay in any position and prevent it from automatically sliding down or sliding down due to bumps of the helmet. Since the mask 29 is mounted on the mask mounting member 31, which is in turn connected to the linkage guide ring member 32, a cylindrical projection 42 is provided on one side of the linkage guide ring member 32. The cylindrical projection 42 is engaged with the multiple arc-shaped grooves with different curvature radii of the strip slider 38. When the mask 29 moves up and down to different positions, the cylindrical projection 42 is engaged with the multiple arc-shaped grooves with different curvature radii of the strip slider 38. Moreover, the strip slider 38 can press against the cylindrical projection 42 under the elastic force of the spring 40. Pressing against the cylindrical projection 42 also limits the rotation of the mask mounting member 30, that is, the rotation of the mask 29. The elastic force of the spring 40 alone cannot limit the rotation of the mask 29 when pushed by hand.

[0064] In order to facilitate the connection between the mask and the linkage guide ring 32 and to simplify the installation operation process, a preferred embodiment of the present invention is that the linkage guide ring 32 is a C-shaped open ring structure, one end of the linkage guide ring 32 of the C-shaped open ring structure is connected to the mask mounting part 31, and a columnar protrusion 42 is provided on one side facing the mounting groove 13 near the connection part, and the columnar protrusion 42 cooperates with the arc-shaped groove 43 to form a limit for the mask; a first mounting hole 44 of the second rotating shaft 33 is provided near the other end of the C-shaped open ring linkage guide ring 32, and a second mounting hole 45 of the second rotating shaft 33 is provided on the rotating component mounting plate 4. The second rotating shaft 33 is installed on the rotating component mounting plate 4 through the first mounting hole 44, the second mounting hole 45 and the fastener 12.1 to install the linkage guide ring 32 and the mask mounting part 31 on the rotating component mounting plate 4, and make the linkage guide ring 32 and the mask mounting part 31 rotate on the rotating component mounting plate 4 around the second rotating shaft 33. The second rotating shaft 33 is a component around which the linkage guide ring 32 and the mask mounting member 31 rotate. The linkage guide ring 32 and the mask mounting member 31 rotate under the drive block 10. When the chin guard 26 is manually rotated, the chin guard 26 drives the drive gear 1, which in turn drives the drive block 10. The triangular shape of the drive block 10 presses against the inner side of the C-shaped open ring of the linkage guide ring 23, driving the linkage guide ring 32 to rotate. Because the inner side of the C-shaped open ring of the linkage guide ring 32 has different curved surface segments, the chin guard 26 can be linked to the mask 29, or the mask 29 can be rotated independently.

[0065] In order to minimize the structural size of the linkage guide ring 32, reduce the weight of the linkage guide ring 32, facilitate the connection between the linkage guide ring 32 and the rotating component mounting plate 4, and facilitate the rotation of the mask around the second rotating shaft 33 and be able to stay in a predetermined position without slipping, a preferred embodiment of the present invention is that the mask mounting member 31 is a strip-shaped arc surface structure, the outer arc surface side of the strip-shaped arc surface is used to connect with the mask 29, and the inner arc surface side of the strip-shaped arc surface is used to connect with the linkage guide ring 32, or the mask mounting member 31 and the linkage guide ring 32 constitute an integral structure, the strip-shaped arc surface is provided with a slot and / or a convex edge on the outer arc surface side for connecting with the mask 29, and the width of the strip-shaped arc surface is greater than the width of the linkage guide ring 32.

[0066] The working principle of the rotation structure of the helmet chin guard is as follows:

[0067] As shown in Figures 1 to 18, the helmet body 12 is injection molded using injection molding, and stepped mounting grooves 13 are injection molded on both sides of the helmet body 12. The second layer of the stepped mounting groove 13 is used to install the mask rotation limiter 30, and the first layer of the stepped mounting groove 13 is used to install the rotating component mounting plate 4. A linkage guide ring 32 is hingedly installed on the side of the rotating component mounting plate 4 facing the stepped mounting groove 13. The linkage guide ring 32 is a C-shaped ring structure. Near one end of the C-shaped ring structure linkage guide ring 32 is connected to the rotating component mounting plate 4 through a second rotating shaft 33, and the other end of the C-shaped ring structure linkage guide ring 32 is connected to the mask mounting part 31. The mask mounting part 31 is an arc-shaped strip structure, and a mask 29 is installed on the outer arc surface of the arc-shaped strip structure mask mounting part 31. Near the other end of the C-shaped annular structure linkage guide ring 32, a cylindrical projection 42 is provided on the side facing the stepped mounting groove 13. This cylindrical projection 42 slidably engages with an arcuate groove 43 on a strip slider 38 in the mask rotation limiter 30, which is mounted within the stepped mounting groove 13. The arcuate groove 43 on the strip slider 38 is provided with multiple segments of arcuate grooves with different curvature radii, forming a toothed arcuate limiting guide groove, which is used to position the mask 29, thereby preventing the mask 29 from sliding down at different positions. The strip slider 38 slidably engages with a strip rod 41 in the mask rotation limiter 30 via an elastic member (spring) 40. The strip rod 41 is screw-mounted within the stepped mounting groove 13 via a fastener 39. When the mask 29 is pushed to slide up and down, the mask 29 rotates on the rotating component mounting plate 4 around the second rotating shaft 33 through the mask mounting part 31 and the linkage guide ring part 32. Near the other end of the C-shaped ring structure linkage guide ring part 32, the columnar protrusion 42 on one side of the step mounting groove 13 will slide in the arc groove 43 on the strip slider 38. Under the action of the elastic part (spring) 40, the strip slider 38 always maintains pressure contact with the columnar protrusion 42. A guide groove and a guide strip are also provided between the strip slider 38 and the strip rod 41.

[0068] A driving block 10 is further provided inside the ring of the C-shaped annular structure linkage guide annular member 32 . The driving block 10 is in a triangular structure and can be used to drive the C-shaped annular structure linkage guide annular member 32 . In the initial state, the chin guard 26 and the mask 29 are both at the lowest end. When the chin guard 26 needs to be lifted up, the right top corner of the triangular structure driving block 10, driven by the first rotating shaft 6, contacts the inner ring of the C-shaped straight edge segment of the C-shaped ring structure linkage guide ring 32 close to the second rotating shaft 33. The right top corner of the triangular structure driving block 10 presses the C-shape to rotate clockwise around the second rotating shaft 33, which will push the mask 29 to lift up together, that is, the linkage stage of the mask 29 and the chin guard 26. When the mask 29 is lifted up to the end point, that is, the upper brim of the helmet, the right top corner of the triangular structure driving block 10 has rotated to the arc segment of the C-shaped ring. At this time, the mask 29 can be rotated downward or upward alone (out of the linkage stage), and the chin guard 26 can continue to flip upward and backward. After the guard 26 flips backward to the end point (the chin guard rotation limit point), the right top corner of the triangular structure driving block 10 has rotated to the left side of the arc segment of the C-shaped ring, and the left top corner of the triangular structure driving block 10 has rotated to the right side of the arc segment of the C-shaped ring. If the chin guard 26 needs to flip upward and forward, at this time, if the mask 29 is located at the lower end of the helmet body 12, the triangular structure driving block 10 rotates counterclockwise under the drive of the first rotating shaft 6, and the left top corner of the triangular structure driving block 10 will contact and press with the inner ring of the C-shaped straight edge segment of the linkage guide ring 32, so that the mask 29 is lifted upward to the end point, or the mask 29 is lifted upward to the upward end position in advance, and then the left top corner of the triangular structure driving block 10 rotates back to the left side of the original position in the opening section of the C-shaped ring. At this time, the mask 29 can be rotated downward to the initial position again.

[0069] The triangular-shaped drive block 10 is a hollow shaft. The hollow shaft has a protruding tooth 19 on the end facing the rotating component mounting plate 4. The protruding tooth 19 engages with a groove 20 on the other side of the drive gear 1, causing the drive gear 1 to rotate with the drive block 10. The rotating component mounting plate 4 is a D-shaped shell structure. The D-shaped shell structure has a flange on the side facing the mounting slot 13. The flange on the vertical straight side of the D-shaped shell structure is a stepped flange. The D-shaped shell structure is provided with a C-shaped guide slot 5. The D-shaped shell structure, enclosed within the C-shaped guide slot, has a through hole 35 for the first rotating shaft 6 to pass through. The D-shaped shell structure is also provided with a mounting hole 36. Fasteners (screws) 37 are used to secure the rotating component mounting plate 4 to the mounting slot 13. The chin guard rotating component includes a driving gear 1, which meshes with a driven gear 2. The driven gear 2 is fixedly installed near one end of the C-shaped guide groove 5 through a fixed shaft 3. A stepped hole 7 is provided in the center of the driving gear 1 to cooperate with the first rotating shaft 6. The first rotating shaft 6 is a hollow shaft. One end of the first rotating shaft 6 is provided with an end cap 8 that cooperates with the stepped hole 7. The other end of the first rotating shaft 6 is provided with a radial groove 9. One end of the first rotating shaft 6 passes through the stepped hole 7 and the through hole 11 on the driving block 10 and cooperates with a protrusion 15 on a boss 14 set in the mounting groove 13. The hollow shaft of the first rotating shaft 6 is connected to the mounting hole 16 on the boss 14 through a fastener (screw) 12.1; the driving gear 1 is provided with an insertion groove 17 and a connecting hole 18 for the chin guard 26 on the annular surface between the driving tooth and the stepped hole 7, and a groove 20 is provided on the other side annular surface of the driving gear 1 between the driving tooth and the stepped hole 7 to engage with the protruding tooth 19 on the driving block 10. The drive gear 1 is an incomplete gear. A protrusion 21 is provided on its toothless annular surface. This protrusion 21 is provided with a radial positioning groove 22. The protrusion 21 protrudes from the side of the drive gear 1 on the side facing the rotating component mounting plate 4 and slidably engages with the C-shaped guide groove 5. The radial positioning groove 22 engages with a radial positioning slider 23, which slidably engages with a radial positioning slot 24. The radial positioning slot 24 is mounted on the inner side of the rotating component mounting plate 4 via fasteners. One end of the radial positioning slider 23 passes through the rotating component mounting plate 4 and is located on the outer side of the rotating component mounting plate 4. An elastic member (spring) 25 is provided between the radial positioning slider 23 and the radial positioning slot 24. The chin guard 26 is provided with a splice tooth 27 that mates with the splice slot 17 on the side facing the drive gear 1. The chin guard 26 also has a mounting hole 28 corresponding to the connecting hole 18. Fasteners are installed in both the connecting hole 18 and the mounting hole 28.

[0070] When the chin guard 26 is rotated, the internally mounted spigot teeth 27 and fasteners (screws) connect the spigot slots 17 and connection holes 18 on the annular surface of the drive gear 1, pushing the drive gear 1 to rotate. Meanwhile, the grooves 20 on the other side of the drive gear 1 engage with the protruding teeth 19 on the drive block 10, causing the drive block 10 to rotate. Because the drive gear 1 is an incomplete gear, it cannot rotate a full revolution, thus preventing the chin guard 26 from rotating. Furthermore, a protrusion 21 is provided at one end of the incomplete gear tooth, which also includes a radial positioning groove 22. Once the radial positioning groove 22 reaches its set position, it is locked by a radial positioning slider 23, preventing further rotation. The radial positioning slider 23 slidably engages with a radial positioning groove 24 mounted on the inner side of the rotating component mounting plate 4 via an elastic member (spring) 25. First rotating shaft 6 is hollow and is connected via fasteners (screws) 12.1 through the hollow first rotating shaft 6, triangular drive block 10, and mounting hole 16 provided in the boss on mounting slot 13. When drive gear 1 rotates, one side of a boss 21 on one end of the incomplete gear tooth slides into a C-shaped guide slot 5 provided on the rotating component mounting plate 4.

[0071] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A rotating structure of a helmet chin guard, characterized in that: The chin guard rotating structure comprises a driving gear (1), a driven gear (2), a rotating component mounting plate (4), and a first rotating shaft (6); the rotating component mounting plate (4) is provided with a C-shaped guide groove (5); a through hole (35) is provided on the mounting plate shell surrounded by the C-shaped guide groove (5); the driving gear (1) is meshed with the driven gear (2); the driven gear (2) is fixedly mounted near one end of the C-shaped guide groove (5) of the rotating component mounting plate (4) via a fixed shaft (3); a stepped hole (7) matching with the first rotating shaft (6) is provided at the center of the driving gear (1); the first rotating shaft (6) passes through the stepped hole (7) and the through hole (35) to be connected to the helmet body.

2. The rotating structure of the helmet chin guard as claimed in claim 1, characterized in that: The driving gear (1) is an incomplete gear. A protrusion (21) is provided on a ring surface without teeth of the incomplete gear. A radial positioning groove (22) is provided on the protrusion (21). A side protrusion protruding from the driving gear (1) is provided on the side of the protrusion (21) facing the rotating component mounting plate (4). The side protrusion is slidably matched with the C-shaped guide groove (5). A radial positioning slide block (23) is also connected to the rotating component mounting plate (4). The radial positioning groove (22) is snap-fitted with the radial positioning slide block (23).

3. The rotating structure of the helmet chin guard as claimed in claim 2, characterized in that: The radial positioning slider (23) and the radial positioning slot (24) are slidably matched with each other. The radial positioning slot (24) is installed on the inner side of the rotating component mounting plate (4) through a fastener. One end of the radial positioning slider (23) passes through the rotating component mounting plate (4) and is located on the outer side of the rotating component mounting plate (4). An elastic member (25) is provided between the radial positioning slider (23) and the radial positioning slot (24).

4. The rotating structure of the helmet chin guard as claimed in claim 1, characterized in that: A plug-in slot (17) and a connection hole (18) for a chin guard (26) are provided on a side annular surface between the driving tooth of the driving gear (1) and the stepped hole (7).

5. The rotating structure of the helmet chin guard as claimed in claim 4, characterized in that: The plug-in slot (17) is arranged on the inner side of the driving gear (1) facing the chin guard (26), and a plug-in tooth (27) matching the plug-in slot (17) is arranged on the inner side of the chin guard (26). The chin guard (26) is also provided with a mounting hole (28) corresponding to the connecting hole (18), and fasteners are installed in the connecting hole (18) and the mounting hole (28).

6. The rotating structure of the helmet chin guard as claimed in claim 1, characterized in that: The first rotating shaft (6) is a hollow shaft. One end of the first rotating shaft (6) is provided with an end cap (8) that matches the stepped hole (7). The other end of the first rotating shaft (6) is provided with a radial groove (9). The other end of the first rotating shaft (6) passes through the stepped hole (7) and matches with a protrusion (15) provided on the helmet body (12). The hollow shaft of the first rotating shaft (6) is connected to the mounting hole (16) on the helmet body (12) via a fastener (12.1).

7. The rotating structure of the helmet chin guard as claimed in claim 1, characterized in that: A groove (20) is provided on the other side annular surface between the driving tooth of the driving gear (1) and the stepped hole (7).

8. The rotating structure of the helmet chin guard as claimed in claim 1, characterized in that: The rotating component mounting plate (4) is in the form of a D-shaped shell structure, and a flange is provided on the side of the D-shaped shell structure facing the helmet body mounting groove (13), wherein the flange on the vertical straight side of the D-shaped shell structure is a stepped flange, and a mounting hole (36) is also provided on the rotating component mounting plate (4) of the D-shaped shell structure, and the mounting hole (36) is used to fix the rotating component mounting plate (4) on the mounting groove (13) via a fastener (37).

9. A helmet, characterized in that: The helmet comprises the rotating structure of the helmet chin guard according to any one of claims 1-8.

10. The helmet according to claim 9, characterized in that The helmet comprises a helmet body (12), a face mask (29) and a chin guard (26) being symmetrically hinged on both sides of the helmet body (12) through a face mask rotating structure and a chin guard rotating structure, mounting grooves (13) are symmetrically arranged on both sides of the helmet body (12), a face mask rotating limiter (30) and a rotating component mounting plate (4) are mounted in the mounting grooves (13), a face mask mounting member (31) in the face mask rotating structure is mounted on the inner side of the rotating component mounting plate (4), and the face mask (29) is connected to the linkage guide member through the face mask mounting member (31). One end of the annular member (32) is connected, and the other end of the linkage guide annular member (32) is hinged to the rotating component mounting plate (4) through a second rotating shaft (33). A driving block (10) matching the inner side of the annular groove (34) is provided in the annular groove (34) on the linkage guide annular member (32). The driving block (10) passes through the rotating component mounting plate (4) through the first rotating shaft (6) and is connected to the chin guard rotating structure arranged on the outer side of the rotating component mounting plate (4). The chin guard rotating structure is respectively connected to the rotating component mounting plate (4) and the chin guard (26).

11. The helmet according to claim 10, characterized in that The mounting grooves (13) are symmetrically arranged on both sides of the helmet body (12), and are respectively arranged as inwardly recessed grooves, the grooves presenting a two-layer stepped groove structure, the two layers of grooves respectively being a mask rotation limiter (30) mounting groove (13) located on the second layer, and a rotating component mounting plate (4) mounting groove located on the first layer, the shape of the mask rotation limiter (30) mounting groove (13) being adapted to the shape of the mask rotation limiter (30), and the shape of the rotating component mounting plate (4) mounting groove being adapted to the shape of the rotating component mounting plate (4).

12. The helmet according to claim 10, characterized in that The driving block (10) is in the form of a triangular sheet, a through hole (11) is provided at the center of the triangular sheet, and convex teeth (19) are provided around the through hole (11) on the side of the triangular sheet facing the rotating component mounting plate (4).

13. The helmet according to claim 10, characterized in that The mask rotation limiting member (30) comprises a strip-shaped slider (38) and a strip-shaped rod (41). The two ends of the strip-shaped rod (41) are connected to the mounting groove (13) via fasteners (39). One side of the strip-shaped rod (41) is connected to the strip-shaped slider (38) via an elastic member (40). One side of the strip-shaped slider (38) is provided with an arc-shaped groove (43) for positioning the mask (29). The arc-shaped groove (43) is provided with a plurality of arc-shaped grooves with different curvature radii to form a toothed arc-shaped limiting guide groove. The strip-shaped rod (41) and the strip-shaped slider (38) are respectively shell structures. The concave cavity side of the strip-shaped rod (41) and the strip-shaped slider (38) faces the mounting groove (13).

14. The helmet according to claim 13, characterized in that The linkage guide ring member (32) is a C-shaped open ring structure. One end of the linkage guide ring member (32) of the C-shaped open ring structure is connected to the mask mounting member (31), and a columnar protrusion (42) facing the mounting groove (13) is provided near the connection portion. The columnar protrusion (42) cooperates with the arc-shaped groove (43) to form a limit for the mask. A first mounting hole (44) of the second rotating shaft (33) is provided near the other end of the C-shaped open ring linkage guide ring member (32). A second mounting hole (45) of the second rotating shaft (33) is provided on the rotating component mounting plate (4). The second rotating shaft (33) is installed on the rotating component mounting plate (4) through the first mounting hole (44), the second mounting hole (45) and the fastener to install the linkage guide ring member (32) and the mask mounting member (31) on the rotating component mounting plate (4), so that the linkage guide ring member (32) and the mask mounting member (31) rotate on the rotating component mounting plate (4) around the second rotating shaft (33).

15. The helmet according to claim 10, characterized in that The mask mounting member (31) is in the form of a strip-shaped arc surface structure, wherein the outer arc surface of the strip-shaped arc surface is used to connect with the mask (29), and the inner arc surface of the strip-shaped arc surface is used to connect with the linkage guide ring member (32), or the mask mounting member (31) and the linkage guide ring member (32) form an integral structure, and the strip-shaped arc surface is provided with a slot and / or a convex edge on the outer arc surface side for connecting with the mask (29), and the width of the strip-shaped arc surface is greater than the width of the linkage guide ring member (32).

Images