Rotation structure of chin guard of helmet

Abstract

Disclosed is a rotating structure of a helmet chin guard, which includes a helmet body, where a mask and a chin guard mounted on the helmet body, the mask is connected to a mask mount, and the chin guard is connected to a chin drive assembly, and a linkage guide ring is connected between the chin drive assembly and the mask mount. The chin guard can achieve linkage with the mask through the chin drive assembly, the linkage guide ring, and the mask mount. When the chin guard is lifted upwards from the bottom in its original state, the mask can be lifted upwards simultaneously. When a lower edge of the chin guard rotates to a brim of the helmet, the mask can rotate freely up and down, and the chin guard can continue to rotate backward to the final limiting position. When the chin guard rotates back for return rotation, if the mask is in the lifted state when the lower edge of the chin guard rotates to the brim of the helmet, the chin guard will drive the mask to rotate downward together and return to the original state through the linkage guide ring.

Description

TECHNICAL FIELD

[0001] The present invention relates to the technical field of personal safety protection equipment, in particular to a helmet designed to protect the human head, and more particularly to a helmet with a jaw-protecting structure, and even more particularly to a rotating structure of a helmet chin guard. The chin guard can rotate from a chin part of the helmet to a rear part of the helmet and can rotate in association with the mask.BACKGROUND ART

[0002] It is well-known that users of various motor vehicles, race cars, speedboats, self-balancing scooters, aircraft, and even bicycles should wear helmets to protect the safety of their heads when operating the equipment; in addition, in many special operation scenarios, such as personnel working in harsh environments like spraying workshops, firefighting and rescue, anti-terrorism and riot control, as well as mining, coal excavation, and tunneling, they also need to wear helmets to protect their heads from various unexpected injuries. Currently, the structural types of helmets mainly include full-face structure helmets and half-face structure helmets. Among them, full-face structure helmets are equipped with a chin guard that wraps around the user's chin, while half-face structure helmets lack such a chin guard. For full-face structure helmets, due to their chin guard structure, they can provide better safety protection for the wearer's head; for half-face structure helmets, since the wearer's mouth, nose, and other organs are not restricted by a chin guard, they exhibit better usability comfort.

[0003] In traditional full-face helmets, the chin guard and the main helmet shell are manufactured as an integrated structure, that is, the chin guard has a relatively fixed structural layout relative to the main helmet shell. Undoubtedly, this traditional full-face helmet with an integrated structure is sturdy and reliable, and thus provides sufficient safety protection for the wearer. However, on the other hand, full-face helmets with an integrated structure also have drawbacks: first, from the perspective of use, when the wearer needs to perform activities such as drinking water, making calls, or resting, they must first remove the helmet to complete the corresponding actions; undoubtedly, this performance of traditional integrated full-face helmets proves relatively inflexible and inconvenient; second, from the perspective of production, full-face helmets with an integrated structure also have the structural feature of a large inner cavity with a small opening, which makes their molds very complex, resulting in low production efficiency, which is the reason for the high manufacturing cost of integrated full-face helmets.

[0004] Obviously, traditional full-face helmets with an integrated structure cannot meet the multi-objective requirements of safety, convenience, and low cost. In view of this, developing a helmet that integrates the advantages of the safety of full-face structures and the convenience of half-face structures has naturally become a goal that current helmet researchers and manufacturers strive to achieve.

[0005] Chinese Patent Application CN105901820A proposes " Variable Chin Guard Structure Helmet Based on Gear Restraint". The most prominent feature of the present invention is that: fixed internal cylindrical gears are respectively arranged on two sides of a helmet shell; correspondingly, two rotating external cylindrical gears are fixedly arranged on the two forks of the chin guard; and corresponding arc-shaped constraint grooves are provided on the base bracket firmly connected to the helmet shell. Through these constraint grooves, the rotating external gears and fixed internal gears are restricted to maintain meshing and form a kinematic pair, thereby constraining the position and posture of the chin guard according to predetermined process requirements. Finally, the chin guard can move along a planned trajectory between the full-face structure position and the half-face structure position and can be reversibly switched between them; in other words, the chin guard can be lifted from the full-face structure position to the half-face structure position as needed, and vice versa. At the same time, since the chin guard and the main helmet shell no longer have an integrated structure, the molds for manufacturing the helmet are simpler, which can reduce manufacturing costs and improve production efficiency. Obviously, the gear-constrained variable chin guard structure solution provided by the above patent application can well 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 the use of long arc-shaped through constraint grooves to maintain the meshing relationship between its rotating external gears and fixed internal gears, and its rotating external gears swing with a large angle of rotation along with the chin guard. As a result, several drawbacks are brought about, which are specifically manifested as follows: 1) The long arc-shaped constraint grooves pose hidden risks to the reliability of the helmet. This is because when the chin guard is in the process of posture conversion, especially when the chin guard is in a certain intermediate position between the full-face structure and the half-face structure to form a so-called flip-up helmet (at this time, the helmet is in the form of a "quasi-half-face structure helmet", which is conducive to the wearer's activities such as drinking water, talking, and temporary ventilation, making it particularly suitable for tunnel operations), the chin guard cannot completely cover the constraint grooves, that is, the fork body of the chin guard cannot effectively cover the long arc-shaped through constraint grooves, which creates an opportunity for foreign objects to enter the meshing kinematic pair formed by the rotating external gears and fixed internal gears. Once this occurs, the gear constraint pair is prone to jamming; in other words, there are indeed certain hidden risks to the reliability of the helmet during use; 2) The existence of long arc-shaped constraint grooves also causes the helmet to produce relatively high noise. Similarly, when the chin guard needs to be in a certain intermediate position between the full-face structure and the half-face structure to form a so-called flip-up helmet during its posture conversion process, for riders, since the chin guard cannot completely cover the constraint grooves, the whistling noise generated by external air flow passing over the outer surface of the helmet can easily enter the interior of the helmet through the through constraint grooves. It should be noted that these constraint grooves are precisely arranged near a wearer's two ears, so the sound insulation effect of the helmet is poor, or in other words, it has poor comfort; 3) The layout and operation mode of the external gears rotating in a planetary manner weaken the safety of the helmet to a certain extent. This is because when the chin guard changes its structural position, the external gears move along with the chin guard and exhibit planetary rotation behavior. It is not difficult to find that the spatial area swept by the external gears is relatively large. Obviously, fastening screws or other fastening structures cannot be arranged in the spatial area passed by the rotating external gears. At this time, the base bracket with long arc-shaped constraint grooves is forced to be designed as a thin-shell component with a large span. As is well-known, components of this structural form have relatively low inherent stiffness, which means the stiffness of the helmet shell is low; in other words, the safety of the helmet is weakened.

[0007] In addition, Chinese Patent CN 210124365 U discloses a gear-constrained variable chin guard structure helmet, which includes a main helmet shell, a chin guard, and forks on the chin guard. It adopts a base bracket, forks, an internal gear, an external gear, and a transmission part to form an associated mechanism. Among them, the internal gear and the external gear both perform fixed-axis rotation and form a meshing constraint pair; the internal gear and the forks slide in cooperation with each other and form a sliding constraint pair; the transmission part transmits the movement of the external gear to the forks and drives the chin guard to generate telescopic displacement relative to the main helmet shell. By means of this, the chin guard can achieve flipping movement while being combined with reciprocating movement, thereby realizing the posture conversion of the chin guard between the full-face position and the half-face position. Since the forks can cover the through slots on the internal gear during the flipping process of the chin guard, foreign objects from the outside are prevented from entering the gear pair, which ensures the reliability of the helmet in use; meanwhile, external noise is blocked from entering the helmet, which improves the comfort of the helmet in use. In addition, the gears with fixed-axis rotation occupy less space, which also creates conditions for improving the rigidity of related components, thus further enhancing the safety of the helmet in use. However, the structure of this helmet is very complex, which is not only inconvenient for processing and manufacturing but also for use; moreover, it has the problems of heavy weight, high manufacturing cost, short service life, and easy damage.

[0008] Chinese Patent CN111264968A also discloses a chin guard positioning assembly and a helmet having the same, which connects a main helmet part covering the user's head and a chin guard. The chin guard moves from a protective position to an open position or from the open position to the protective position. The chin guard positioning assembly includes: a movable base part connected to the chin guard and can move in position together with the chin guard; a fixed base part connected to the main helmet part and the movable base part, and serves as a reference for the positional movement of the movable base part; a fixed magnetic part fixed on the fixed base part; and a movable magnetic part interacting with the magnetism of the fixed magnetic part and fixed on the movable base part, so as to fix the movable base part at a first position or a second position. This helmet also has the problems of complex structure, inconvenience for processing and manufacturing and use, moreover, heavy weight, high manufacturing cost, short service life, and easy damage, etc.

[0009] To sum up, the existing variable chin guard structure helmets still have room for further improvement and enhancement.SUMMARY OF THE INVENTION

[0010] The objective of the present invention is to overcome the defects existing in the prior art and provide a rotating structure for a chin guard on a helmet, which has a simple structure, a small number of components, easy processing and manufacturing, convenient use, a long service life, a light overall weight of the helmet, and can realize the linkage between the chin guard and the mask.

[0011] To achieve the above objective of the present invention, the present invention adopts the following technical solution: rotating structure of a helmet chin guard, where the rotating structure of the helmet chin guard includes 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 slot, and a through hole is provided on the mounting plate housing enclosed by the C-shaped guide slot, the driving gear meshes with the driven gear, and the driven gear is fixedly mounted near one end of the C-shaped guide slot of the rotating component mounting plate via a fixed shaft, a stepped hole that cooperates with the first rotating shaft is provided at a center of the driving gear, and the first rotating shaft passes through the stepped hole and the through hole to connect with a helmet body. Since the chin guard is mounted on the side of the driving gear, when the chin guard is pushed to rotate, the driving gear will rotate around the first rotating shaft; meanwhile, the driving gear is meshed with the driven gear, the driven gear is mounted on the rotating component mounting plate via the fixed shaft, and the rotating component mounting plate is mounted on the helmet body. The gear transmission structure is used to enable the chin guard to rotate more smoothly and extend the service life.

[0012] For the convenience of guiding and limiting the movement trajectory of the side projection, facilitating the mounting of the chin guard rotating component on the rotating component mounting plate, and at the same time minimizing the structural size and weight of the rotating component mounting plate, a preferred technical solution includes that the driving gear is an incomplete gear. Since the rotation range of the chin guard is about 250 degrees, there is no need to make the driving gear a complete gear; the incomplete gear is provided with a projection on the toothless annular surface, and the projection is provided with a radial positioning slot, which is used to limit the chin guard to stop rotating after it rotates to a certain position; the side of the projection facing the rotating component mounting plate is provided with a side projection protruding from the driving gear, and the side projection slides in cooperation with the C-shaped guide slot; the side projection is used to guide the driving gear to rotate along the range of the C-shaped guide slot and can ensure the stable meshing between the driving gear and the driven gear; the rotating component mounting plate is further connected with a radial positioning slider, and the radial positioning slot on the driving gear engages in cooperation with the radial positioning slider, that is to say, after the positioning slot on the driving gear rotates to the position where the radial positioning slider is located, it will be clamped by the radial positioning slider and can no longer continue to rotate; further preferably, the radial positioning slider and a radial positioning chute slide in cooperation with each other; the radial positioning slider is a long strip-shaped slider, the upper end of which is used to limit the rotation of the driving gear, and the lower part slides in the radial positioning chute; the radial positioning chute is a U-shaped part, and the radial positioning chute is mounted on the inner side of the rotating component mounting plate via a fastener; one end of the radial positioning slider passes through the rotating component mounting plate and is located on an outer side of the rotating component mounting plate, and an elastic member is arranged between the radial positioning slider and the radial positioning chute.

[0013] To enable coupling connection between the chin guard and the rotating structure of the chin guard, an insertion slot and a connecting hole for the chin guard are provided on the annular surface between the driving teeth of the driving gear and the stepped hole. The insertion slot is used for inserting the protruding insertion teeth on the inner side of the chin guard, and the connecting hole is used for fixing the chin guard to the driving gear with screws, so that when the chin guard is rotated, the driving gear can rotate accordingly.

[0014] For the convenience of connecting the chin guard with the rotating component of the chin guard and, at the same time, connecting the rotating component of the chin guard 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 to minimize the structural size of the chin guard mounting part and reduce its weight, the preferred technical solution further includes that the insertion slot is arranged on the inner side of the driving gear facing the chin guard; the side of the chin guard facing the driving gear is provided with insertion teeth adapted to the insertion slot; the chin guard is also provided with mounting holes corresponding to the connecting holes; fasteners (screws) are installed in the connecting holes and the mounting holes.

[0015] To stably connect the driving gear to the rotating component mounting plate, the first rotating shaft is a hollow shaft. The hollow shaft facilitates the passage of a fixing screw through its center. The function of the hollow shaft is to allow the driving gear to rotate on it and rub against its outer surface, rather than rubbing against the fixing screw and causing it to loosen. The first rotating shaft has one end provided with an end cap that fits into the stepped hole and cooperates with the screw cap and the other end provided with a radial slot, and the radial slot is a clamping slot that cooperates with a projection on a boss in a mounting slot on the helmet to prevent rotation of the first shaft. The other end of the first rotating shaft passes through the stepped hole and engages with the projection 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. When other components are also provided on the inner side of the rotating component mounting plate, such as a driving block for realizing the linkage between the chin guard and the mask, the first rotating shaft may also pass through a through hole in the other components. The projection may be located on a boss within the helmet body mounting slot. To enable coupling connection between the driving gear and the inner component of the rotating component mounting plate, a groove is provided on the other side of the annular surface between the driving teeth of the driving gear and the stepped hole. For example, the inner component can be a driving block for realizing the linkage between the chin guard and the mask. When the driving block is provided with raised teeth, the groove engages with the raised teeth. The groove on the annular surface on the other side of the driving gear is designed to interlock with the raised teeth provided on the driving block. As such, when the chin guard drives the driving gear to rotate, the driving gear can, in turn, drive the driving block to rotate together.

[0016] For the convenience of guiding and limiting the movement trajectory of the driving block, facilitating the mounting of the chin guard rotating component on the rotating component mounting plate, and at the same time minimizing the structural size and weight of the rotating component mounting plate, the preferred technical solution further includes that the rotating component mounting plate is of a D-shaped housing structure. The rotating component mounting plate is made into a D-shaped housing structure primarily to accommodate the linkage guide ring and the mask mount on one side, while facilitating linkage with the chin guard on the other side. A flange is provided at a side of the D-shaped housing structure facing the mounting slot. The flange serves to create a cavity between the rotating component mounting plate and the helmet body mounting slot for accommodating the linkage guide ring and the driving block. The flange on the vertical straight edge side of the D-shaped housing structure is a stepped flange, which is used for guiding the rotation of the mask mount. A through hole is provided on the D-shaped housing enclosed by the C-shaped guide slot for the first rotating shaft to pass through. The rotating component mounting plate of the D-shaped housing structure is also provided with a mounting hole, which is used to mount the rotating component mounting plate on the helmet body using screws. The mounting hole fixedly mounts the rotating component mounting plate on the mounting slot via a fastener.

[0017] In addition, the present invention provides a helmet including a rotating structure of a helmet chin guard as defined in any of the preceding claims.

[0018] In order to ensure the stable installation of the chin guard and the mask on the helmet body, and to enable the chin guard and the mask to rotate flexibly on the helmet body and stop at a set position, the preferred technical solution further includes that a mask and a chin guard are symmetrically hinged on two sides of the helmet body via a mask rotating structure and a chin guard rotating structure, respectively, mounting slots are symmetrically provided on two sides of the helmet body, a mask rotation limiter and a rotating component mounting plate are mounted in the mounting slots, and a mask mount in the mask rotating structure is mounted on an inner side of the rotating component mounting plate, the mask is connected to one end of the linkage guide ring via the mask mount, the other end of the linkage guide ring is hinged to the rotating component mounting plate via a second rotating shaft, the annular groove on the linkage guide ring is provided therein with a driving block cooperating with an inner side of the annular groove, and the driving block passes through the rotating component mounting plate via the first rotating shaft and is connected to the chin guard rotating structure provided on the outer side of the rotating component mounting plate, the chin guard rotating structure is connected to the rotating component mounting plate and the chin guard, respectively. The cooperation of the linkage guide ring and the driving block enables linkage of the chin guard and the mask, as well as independent rotation of the mask.

[0019] In order to hide the mask rotating component and the chin guard rotating component inside the helmet body to prevent damage and achieve an aesthetically pleasing appearance, the preferred technical solution further includes that the mounting slots are symmetrically arranged on two sides of the helmet body and are designed as inwardly recessed grooves with a two-layer stepped structure. The grooves are stepped because the linkage guide ring installed in the grooves and the mask rotation limiter are components with a two-layer structure. The two-layer grooves are respectively a mounting slot for the mask rotation limiter located at a second layer and a mounting slot for the rotating component mounting plate located at a first layer, the shape of the mounting slot for the mask rotation limiter conforms to the shape of the mask rotation limiter, and the shape of the mounting slot for the rotating component mounting plate conforms to the shape of the rotating component mounting plate. To facilitate the chin guard and its rotating component to drive the driving block, which in turn drives the linkage guide ring to rotate around the second rotating shaft and drives the mask to rotate accordingly, the preferred technical solution includes that the driving block is in the form of a triangular plate with a through hole in the center and raised teeth in the periphery of the through hole on a side of the triangular plate facing the rotating component mounting plate. These raised teeth are designed to fit into the grooves on the opposite annular surface of the driving gear, so that the driving gear drives the driving block to rotate.

[0020] To effectively limit the rotation range of the mask and prevent it from automatically sliding down after rotating to a predetermined position or oscillating due to vibrations and jolts of the helmet body during helmet wear, the preferred technical solution further includes that the mask rotation limiter includes a strip-shaped slider and a strip-shaped rod, two ends of the strip-shaped rod are connected to the mounting slot via fasteners near the ends, one side of the strip-shaped rod is connected to the strip-shaped slider via an elastic member, one side of the strip-shaped slider is provided with an arch-shaped groove for positioning the mask, and a toothed arc-shaped limiting guide slot is formed by a plurality of arch-shaped grooves with different curvature radii provided on the arch-shaped groove, the strip-shaped rod and the strip-shaped slider are each of a housing structure, and a side of the strip-shaped rod and the strip-shaped slider where the concave cavity is located faces the mounting slot. This arrangement ensures that the mask can remain in any position without slipping automatically or due to helmet vibrations. Since the mask is mounted on the mask mount, 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 engages with the plurality of arc-shaped grooves of different radii on the strip-shaped slider. When the mask moves up or down to different positions, it is retained by the cylindrical projection in the plurality of arc-shaped grooves of different radii on the strip-shaped slider. Moreover, under the elastic force of the spring, the strip-shaped slider can press against the cylindrical projection, thereby limiting the rotation of the mask mount, i.e., the rotation of the mask. The spring force of a single spring is insufficient to restrict manual rotation of the mask.

[0021] For the convenience of connecting the mask to the linkage guide ring and simplifying the installation process at the same time, the preferred technical solution further includes that the linkage guide ring is of a C-shaped open ring structure, one end of the C-shaped open ring structure linkage guide ring is connected to the mask mount, and a cylindrical projection facing one side of the mounting slot is provided near a connection part, and the cylindrical projection cooperates with the arch-shaped groove to limit the position of the mask; a first mounting hole for the 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 mounts the linkage guide ring and the mask mount on the rotating component mounting plate via the first mounting hole, the second mounting hole, and a fastener, and causes the linkage guide ring and the mask mount to rotate on the rotating component mounting plate about the second rotating shaft. The second rotating shaft is a component around which the linkage guide ring and the mask mount rotate. The linkage guide ring and the mask mount rotate under the drive of the driving block. When the chin guard is manually rotated, it drives the driving gear, which in turn drives the driving block. The triangular top of the driving block presses against the inner side of the C-shaped opening of the linkage guide ring, driving the rotation of the linkage guide ring. Since the inner side of the C-shaped opening of the linkage guide ring has different curved sections, it allows the chin guard to move in conjunction with the mask or enables the mask to rotate independently.

[0022] To minimize the structural size and weight of the linkage guide ring to facilitate its connection to the rotating component mounting plate, enable the mask to rotate around the second rotating shaft, and remain in a predetermined position without slipping, the preferred technical solution includes that the mask mount is of a strip arc-shaped surface structure, with one side of an outer arc-shaped surface of the strip arc-shaped surface structure being used for connection with the mask, and one side of an inner arc-shaped surface being used for connection with the linkage guide ring, or the mask mount and the linkage guide ring form an integral structure, the strip arc-shaped surface structure is provided with slots and / or raised edges on a side of the outer arc-shaped surface used for connection with the mask, and the width of the strip arc-shaped surface structure is greater than that of the linkage guide ring.

[0023] Compared with the helmets with the same or similar use effects as those disclosed in the above background art, the rotating structure of the upper and lower chin guards of this helmet has greatly simplified various connecting components and driving wheel component structures for the rotation of the chin guard and the rotation of the mask. The number of its components is reduced to 1 / 3 to 1 / 5 of the number of components used for installing and driving the chin guard and mask on existing similar helmets. At the same time, the complexity of each component is also greatly simplified, so that the use performance of the helmet product is greatly improved. Due to the small number of components and the relatively simple structure of each component, the manufacturing cost of the helmet will be lower, the reliability in use will be improved, and the service life will be prolonged, which makes the assembly and disassembly of the helmet more convenient, and the opening / closing operations of the chin guard and mask during use are also more convenient, faster, and more stable. According to the present invention, the chin guard can achieve linkage with the mask through the chin drive assembly, the linkage guide ring, and the mask mount. When the chin guard is lifted upwards from the bottom in its original state, the mask can be lifted upwards simultaneously. When a lower edge of the chin guard rotates to a brim of the helmet, the mask can rotate freely up and down, and the chin guard can continue to rotate backward to the final limiting position. When the chin guard rotates back for return rotation, if the mask is in the lifted state when the lower edge of the chin guard rotates to the brim of the helmet, the chin guard will drive the mask to rotate downward together and return to the original state through the linkage guide ring.BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG. 1 is a perspective view of a helmet in a rotating structure of a helmet chin guard according to the present invention; FIG. 2 is a schematic exploded structural diagram showing one side connection in a rotating structure of a helmet chin guard according to the present invention; FIG. 3 is a partially enlarged view of a connecting structure in FIG. 2 according to the present invention; FIG. 4 is a schematic structural diagram showing an outer side of a rotating component mounting plate in an initial state in an operating principle of a rotating structure of a helmet chin guard according to the present invention; FIG. 5 is a schematic structural diagram showing an inner side of a rotating component mounting plate in an initial state in an operating principle of a rotating structure of a helmet chin guard according to the present invention; FIG. 6 is a schematic structural diagram showing an outer side of a rotating component mounting plate when a chin guard drives a mask upward simultaneously in an operating principle of a rotating structure of a helmet chin guard according to the present invention; FIG. 7 is a schematic structural diagram showing an inner side of a rotating component mounting plate when a chin guard drives a mask upward simultaneously in an operating principle of a rotating structure of a helmet chin guard according to the present invention; FIG. 8 is a schematic structural diagram showing an inner side of a rotating component mounting plate when a chin guard drives a mask upward simultaneously to a rotation terminating state in an operating principle of a rotating structure of a helmet chin guard according to the present invention; FIG. 9 is a schematic structural diagram showing an inner side of a rotating component mounting plate when a chin guard drives a mask upward simultaneously to a rotation terminating state in an operating principle of a rotating structure of a helmet chin guard according to the present invention; FIG. 10 is a schematic structural diagram showing an outer side of a rotating component mounting plate when a chin guard continues to rotate backward after an upward rotation of a mask is terminated in a rotating structure of a helmet chin guard according to the present invention; FIG. 11 is a schematic structural diagram showing an inner side of a rotating component mounting plate when a chin guard continues to rotate backward after an upward rotation of a mask is terminated in an operating principle of a rotating structure of a helmet chin guard according to the present invention; FIG. 12 is a schematic structural diagram showing an outer side of a rotating component mounting plate when a chin guard rotates backward to a finishing point after a upward rotation of a mask is terminated in an operating principle of a rotating structure of a helmet chin guard according to the present invention; FIG. 13 is a schematic structural diagram showing an inner side of a rotating component mounting plate when a chin guard rotates backward to a finishing point after an upward rotation of a mask is terminated in a rotating structure of a helmet chin guard according to the present invention; FIG. 14 is a schematic structural diagram showing an inner side of a rotating component mounting plate when a chin guard rotates backward to an end point, the mask rotates downward to the end point, and then begins to rotate upward in a rotating structure of a helmet chin guard according to the present invention; FIG. 15 is a schematic structural diagram showing an inner side of a rotating component mounting plate when a chin guard starts to rotate forward and the mask rotates upward in an operating principle of the rotating structure of a helmet chin guard according to the present invention; FIG. 16 is a schematic structural diagram showing an inner side of a rotating component mounting plate during an initial forward rotation of a chin guard and an upward rotation of a mask to an end position in a rotating structure of a helmet chin guard according to the present invention; FIG. 17 is a schematic structural diagram showing an inner side of a rotating component mounting plate when a chin guard starts to rotate forward to an end point and a mask rotates upward to the end point in a rotating structure of a helmet chin guard according to the present invention; and FIG. 18 is a schematic structural diagram showing an inner side of a chin guard shown in FIG. 1 in a rotating structure of a helmet chin guard according to the present invention. In the figure: 1. driving gear; 2. driven gear; 3. fixed shaft; 4. rotating component mounting plate; 5. C-shaped guide slot; 6. first rotating shaft; 7. stepped hole; 8. end cap; 9. radial slot; 10. driving block; 11. through hole; 12. helmet body; 12.1. fastener; 13. mounting slot; 14. boss; 15. projection; 16. mounting hole; 17. insertion slot; 18. connecting hole; 19. raised teeth; 20. groove; 21. projection; 22. radial positioning slot; 23. radial positioning slider; 24. radial positioning chute; 25. elastic member; 26. chin guard; 27. insertion teeth; 28. mounting hole; 29. mask; 30. mask rotation limiter; 31. mask mount; 32. linkage guide ring; 33. second rotating shaft; 34. annular groove; 35. through hole; 36. mounting hole; 37. fastener; 38. strip-shaped slider; 39. fastener; 40. elastic member; 41. strip-shaped rod; 42. cylindrical projection; 43. arch-shaped groove; 44. first mounting hole; 45. second mounting hole. Rotating components for the chin guard include: 1. driving gear; 2. driven gear; 6. first rotating shaft; Mounting components for a rotating part of the chin guard include: 3. fixed shaft; 4. rotating component mounting plate; 8. end cap; 12.1. fastener; 37. fastener; The chin guard rotation limiter and the limiting structure include: 21. projection; 22. radial positioning slot; 23. radial positioning slider; 24. radial positioning chute; 25. elastic member; The structure of the mounting component of the rotating member of the chin guard includes: 5. C-shaped guide slot; 7. stepped hole; 8. end cap; 9. radial slot; 11. through hole; 13. mounting slot; 14. boss; 15. projection; 16. mounting hole; 17. insertion slot; 18. connecting hole; 19. raised teeth; 20. groove; 27. insertion tooth; 28. mounting hole; 35. through hole; 36. mounting hole; 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; the mounting components for the mask include: 31. mask mount; the limiters for the mask include: 30. mask rotation limiter; 38. strip-shaped slider; 39. fastener; 40. elastic member; 41. strip-shaped rod; 42. cylindrical projection; 43. arch-shaped groove; DETAILED DESCRIPTION OF THE INVENTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0026] As shown in FIGS. 1 to 18, the present invention is a rotating structure of a helmet chin guard. The rotating component of the chin guard includes a driving gear 1. The driving gear 1 meshes with a driven gear 2. The driven gear 2 is fixedly mounted near one end of the C-shaped guide slot 5 of the rotating component mounting plate 4 via a fixed shaft 3. The center of the driving gear 1 is provided with a stepped hole 7 that cooperates with the first rotating shaft 6. The first rotating shaft 6 is a hollow shaft. The first rotating shaft 6 has one end provided with an end cap 8 that cooperates with the stepped hole 7 and the other end provided with a radial slot 9. The other end of the first rotating shaft 6 passes through the stepped hole 7 and a through hole 11 on the driving block 10, engaging with a projection 15 on a boss 14 within the mounting slot 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 via a fastener 12.1. The driving gear 1 has an insertion slot 17 and a connecting hole 18 for the chin guard 26 on the annular surface between the driving teeth and the stepped hole 7. On the other annular surface of the driving gear 1 between the driving teeth and the stepped hole 7, there is a groove 20 that engages with the raised teeth 19 on the driving block 10.

[0027] Since the chin guard 26 is mounted on the side of the driving gear 1, when the chin guard 26 is pushed to rotate, the driving gear 1 will rotate around the first rotating shaft 6; meanwhile, the driving gear 1 is meshed 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 gear transmission structure is used to enable the chin guard 26 to rotate more smoothly and extend the service life.

[0028] For the convenience of guiding and limiting the movement trajectory of the side projection 10, facilitating the mounting of the chin guard rotating component on the rotating component mounting plate 4, and at the same time minimizing the structural size and weight of the rotating component mounting plate 4, a preferred embodiment of the present invention includes that the driving gear 1 is an incomplete gear. Since the rotation range of the chin guard 26 is about 250 degrees, there is no need to make the driving gear 1 a complete gear; the incomplete gear is provided with a projection 21 on the toothless annular surface, and the projection 21 is provided with a radial positioning slot 22, which is used to limit the chin guard 26 to stop rotating after it rotates to a certain position; the side of the projection 21 facing the rotating component mounting plate 4 is provided with a side projection protruding from the driving gear 1, and the side projection slides in cooperation with the C-shaped guide slot 5; the side projection is used to guide the driving gear 1 to rotate along the range of the C-shaped guide slot and can ensure the stable meshing between the driving gear 1 and the driven gear; the rotating component mounting plate 4 is further connected with a radial positioning slider 23, and the radial positioning slot 22 on the driving gear 2 engages in cooperation with the radial positioning slider 23, that is to say, after the positioning slot 22 on the driving gear 1 rotates to the position where the radial positioning slider 23 is located, it will be clamped by the radial positioning slider 23 and can no longer continue to rotate; the radial positioning slider 23 and a radial positioning chute 24 slide in cooperation with each other; the radial positioning slider 23 is a long strip-shaped slider, the upper end of which is used to limit the rotation of the driving gear 1, and the lower part slides in the radial positioning chute 24; the radial positioning chute 24 is mounted on the inner side of the rotating component mounting plate 4 via a fastener; one end of the radial positioning slider 24 passes through the rotating component mounting plate 4 and is located on an outer side of the rotating component mounting plate 4, and an elastic member 25 is arranged between the radial positioning slider 23 and the radial positioning chute 24.

[0029] For the convenience of connecting the chin guard 26 with the chin guard rotating member, at the same time, connecting the rotating member of the chin guard 26 with the driving block 10, and to minimize the structural size of the chin guard mounting part and reduce its weight, the preferred embodiment of the present invention further includes that the insertion slot 17 is provided at the inner side of the driving gear 1 facing the chin guard 26. Insertion teeth 27 adapted to the insertion slot 17 are provided at the inner side of the chin guard 26, and the chin guard 26 is further provided with a mounting hole 28 corresponding to the connecting hole 18. Fasteners (screws) are installed in the connecting hole 18 and the mounting hole 28. To stably connect the driving gear 1 to the rotating component mounting plate 4, the first rotating shaft 6 is a hollow shaft. The hollow shaft facilitates the passage of a fixing screw 12.1 through its center. The function of the hollow shaft is to allow the driving gear 1 to rotate on it and rub against its outer surface, rather than rubbing against the fixing screw 12.1 and causing it to loosen. The first rotating shaft 6 has one end provided with an end cap 8 that fits into the stepped hole 7 and cooperates with the screw 12.1 cap and the other end provided with a radial slot 9, and the radial slot 9 is a clamping slot that cooperates with a projection 15 on a boss 14 in a mounting slot on the helmet to prevent rotation of the first shaft 6. The other end of the first rotating shaft 6 passes through the stepped hole 7 and engages with the projection 15 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. When other components are also 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 may also pass through a through hole 11 in the other components. The projection 15 may be located on a boss 15 within the helmet body mounting slot 13.

[0030] To enable coupling connection between the driving gear 1 and the inner component of the rotating component mounting plate 4, a groove 17 is provided on the other side of the annular surface between the driving teeth of the driving gear 1 and the stepped hole 7. For example, the inner component can be a driving block 10 for realizing the linkage between the chin guard 26 and the mask 29. When the driving block 10 is provided with raised teeth 19, the groove 20 engages with the raised teeth 19. The groove 20 on the annular surface on the other side of the driving gear 1 is designed to interlock with the raised teeth 19 provided on the driving block 10. As such, when the chin guard 26 drives the driving gear 1 to rotate, the driving gear 1 can, in turn, drive the driving block 10 to rotate together.

[0031] In order to ensure the stable installation of the chin guard 26 and the mask 29 on the helmet body 12, and to enable the chin guard 26 and the mask 29 to rotate flexibly on the helmet body 12 and stop at a set position, the preferred embodiment of the present invention further includes that a mask 29 and a chin guard 26 are symmetrically hinged on two sides of the helmet body 12 via a mask rotating structure and a chin guard rotating structure, respectively, the mounting slots 13 are symmetrically provided on two sides of the helmet body 12, a mask rotation limiter 30 and a rotating component mounting plate 4 are mounted in the mounting slots 13, and a mask mount 31 in the mask rotating structure is mounted on an inner side of the rotating component mounting plate 4, the mask 29 is connected to one end of the linkage guide ring 32 via the mask mount 31, the other end of the linkage guide ring 32 is hinged to the rotating component mounting plate 4 via a second rotating shaft 33, the annular groove 34 on the linkage guide ring 32 is provided therein with a driving block 10 cooperating with an inner side of the annular groove 34, and the driving block 10 passes through the rotating component mounting plate 4 via the first rotating shaft 6 and is connected to the chin guard rotating structure provided on the outer side of the rotating component mounting plate 4, the chin guard rotating structure is connected to the rotating component mounting plate 4 and the chin guard 26, respectively. The cooperation of the linkage guide ring 32 and the driving block 10 enables linkage of the chin guard 26 and the mask 29, as well as independent rotation of the mask 29.

[0032] In order to hide the mask rotating component and the chin guard rotating component inside the helmet body 12 to prevent damage and achieve an aesthetically pleasing appearance, the preferred embodiment of the present invention further includes: the mounting slots 13 are symmetrically arranged on two sides of the helmet body 12 and are designed as inwardly recessed grooves with a two-layer stepped structure. The grooves are stepped because the linkage guide ring 23 installed in the grooves and the mask rotation limiter 30 are components with a two-layer structure. The two-layer grooves are respectively a mounting slot 13 for the mask rotation limiter 30 located at a second layer and a mounting slot 13 for the rotating component mounting plate 4 located at a first layer, the shape of the mounting slot 13 for the mask rotation limiter 30 conforms to the shape of the mask rotation limiter 30, and the shape of the mounting slot 13 for the rotating component mounting plate 4 conforms to the shape of the rotating component mounting plate 4.

[0033] To facilitate the chin guard 26 and its rotating component to drive the driving block 10, which in turn drives the linkage guide ring 32 to rotate around the second rotating shaft 33 and drives the mask to rotate, the preferred embodiment of the present invention further includes that the driving block 10 is in the form of a triangular plate with a through hole 11 in the center and raised teeth 19 in the periphery of the through hole 11 on a side of the triangular plate facing the rotating component mounting plate 4. These raised teeth 19 are designed to fit into the grooves 20 on the opposite annular surface of the driving gear 1, so that the driving gear 1 drives the driving block 10 to rotate.

[0034] For the convenience of guiding and limiting the movement trajectory of the driving block 10, facilitating the mounting of the chin guard rotating component on the rotating component mounting plate 4, and at the same time minimizing the structural size and weight of the rotating component mounting plate 4, the preferred embodiment of the present invention further includes that the rotating component mounting plate 4 is of a D-shaped housing structure. The rotating component mounting plate 4 is made into a D-shaped housing structure primarily to accommodate the linkage guide ring 32 and the mask mount 31 on one side, while facilitating linkage with the chin guard 26 on the other side. A flange is provided at a side of the D-shaped housing structure facing the mounting slot 13, and the stepped flange is used for guiding the rotation of the mask mount 31. The flange on one side of the vertical straight side of the D-shaped housing structure is a stepped flange. A C-shaped guide slot 5 is provided on the D-shaped housing structure's rotating component mounting plate 4. A through hole 35 is provided on the D-shaped housing enclosed by the C-shaped guide slot for the first rotating shaft 6 to pass through. The rotating component mounting plate 4 of the D-shaped housing structure is also provided with a mounting hole 36, which is used to mount the rotating component mounting plate 4 on the helmet body 12 using screws. The mounting hole 36 fixedly mounts the rotating component mounting plate 4 on the mounting slot 13 via a fastener 37.

[0035] To effectively limit the rotation range of the mask 29 and prevent it from automatically sliding down after rotating to a predetermined position or oscillating due to vibrations and jolts of the helmet body during helmet wear, a further preferred embodiment includes that the mask rotation limiter 30 includes a strip-shaped slider 38 and a strip-shaped rod 41, two ends of the strip-shaped rod 41 are connected to the mounting slot 13 via fasteners 39 near the ends, 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 arch-shaped groove 43 for positioning the mask 29, and a toothed arc-shaped limiting guide slot is formed by a plurality of arch-shaped grooves with different curvature radii provided on the arch-shaped groove 43, the strip-shaped rod 41 and the strip-shaped slider 38 are each of a housing structure, and a side of the strip-shaped rod 41 and the strip-shaped slider 38 where the concave cavity is located faces the mounting slot 13. This structure is designed to enable the mask 29 to remain stationary in any position without slipping automatically or due to jolting of the helmet. Since the mask 29 is mounted on the mask mount 31, which is in turn connected to the linkage guide ring 32, a cylindrical projection 42 is provided on one side of the linkage guide ring 32. The cylindrical projection 42 engages with the plurality of arch-shaped grooves of different radii on the strip-shaped slider 38. When the mask 29 moves up or down to different positions, it is retained by the cylindrical projection 42 in the plurality of arch-shaped grooves of different radii on the strip-shaped slider 38. Moreover, the strip-shaped slider 38, under the elastic force of the spring 40, the strip-shaped slider 38 can press against the cylindrical projection 42, thereby limiting the rotation of the mask mount 30, i.e., the rotation of the mask 29. The spring force of the single spring 40 is insufficient to restrict rotation of the mask 29.

[0036] For the convenience of connecting the mask to the linkage guide ring 32 and simplifying the installation process at the same time, the preferred embodiment of the present invention further includes that the linkage guide ring 32 is of a C-shaped open ring structure, one end of the C-shaped open ring structure linkage guide ring 32 is connected to the mask mount 31, and a cylindrical projection 42 facing one side of the mounting slot 13 is provided near a connection part, and the cylindrical projection 42 cooperates with the arch-shaped groove 43 to limit the position of the mask; a first mounting hole 44 for 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 for the second rotating shaft 33 is provided on the rotating component mounting plate 4, the second rotating shaft 33 mounts the linkage guide ring 32 and the mask mount 31 on the rotating component mounting plate 4 via the first mounting hole 44, the second mounting hole 45, and a fastener 12.1, and causes the linkage guide ring 32 and the mask mount 31 to rotate on the rotating component mounting plate 4 about the second rotating shaft 33. The second rotating shaft 33 is a component around which the linkage guide ring 32 and the mask mount 31 rotate. The linkage guide ring 32 and the mask mount 31 rotate under the drive of the driving block 10. When the chin guard 26 is manually rotated, it drives the driving gear 1, which in turn drives the driving block 10. The triangular top of the driving block 10 presses against the inner side of the C-shaped opening of the linkage guide ring 32, driving the rotation of the linkage guide ring 32. Since the inner side of the C-shaped opening of the linkage guide ring 32 has different curved sections, it allows the chin guard 26 to move in conjunction with the mask 29 or enables the mask 29 to rotate independently.

[0037] To minimize the structural size and weight of the linkage guide ring 32 to facilitate its connection to the rotating component mounting plate 4, enable the mask to rotate around the second rotating shaft 33, and remain in a predetermined position without slipping, the preferred embodiment of the present invention includes that the mask mount 31 is of a strip arc-shaped surface structure, with one side of an outer arc-shaped surface of the strip arc-shaped surface structure being used for connection with the mask 29, and one side of an inner arc-shaped surface being used for connection with the linkage guide ring 32, or the mask mount 31 and the linkage guide ring 32 form an integral structure, the strip arc-shaped surface structure is provided with slots and / or raised edges on a side of the outer arc-shaped surface used for connection with the mask 29, and the width of the strip arc-shaped surface structure is greater than that of the linkage guide ring 32.

[0038] The operating principle of the rotating structure of the helmet chin guard is as follows: As shown in FIGS. 1-18, the helmet body 12 is molded by injection molding. Stepped mounting slots 13 are molded on two sides of the helmet body 12. The second layer of the stepped mounting slot 13 is used for mounting the mask rotation limiter 30, and the first layer is used for mounting the rotating component mounting plate 4. A linkage guide ring 32 is hingedly mounted on the side of the rotating component mounting plate 4 facing the stepped mounting slot 13 for connection. The linkage guide ring 32 has a C-shaped annular structure. One end of the C-shaped annular structure linkage guide ring 32 is connected to the rotating component mounting plate 4 via a second rotating shaft 33. The other end of the C-shaped annular structure linkage guide ring 32 is connected to the mask mount 31. The mask mount 31 has an arc-shaped strip structure, and the mask 29 is mounted on the outer arc surface of the arc-shaped strip mask mount 31. Near the other end of the C-shaped annular structure linkage guide ring 32, a cylindrical projection 42 is provided on the surface facing the stepped mounting slot 13. The cylindrical projection 42 slides in cooperation with the arch-shaped groove 43 on the strip-shaped slider 38 of the mask rotation limiter 30 installed in the stepped mounting slot 13. The arch-shaped groove 43 on the strip-shaped slider 38 consists of a plurality of arch-shaped grooves with different radii of curvature, forming a toothed arc-shaped limiting guide slot for positioning the mask 29, which allows the mask 29 to remain in different positions without sliding off. The strip-shaped slider 38 slides in cooperation with a strip-shaped rod 41 in the mask rotation limiter 30 via an elastic member (spring) 40. The strip-shaped rod 41 is screwed into the stepped mounting slot 13 using a fastener 39. When the mask 29 is pushed to slide up and down, it rotates on the rotating component mounting plate 4 about the second rotating shaft 33 via the mask mount 31 and the linkage guide ring 32. Near the other end of the C-shaped ring-like structure linkage guide ring 32, the cylindrical projection 42 on the surface facing the stepped mounting slot 13 slides within the arch-shaped groove 43 on the strip-shaped slider 38. The strip-shaped slider 38 remains in pressing contact with the cylindrical projection 42 under the action of the elastic member (spring) 40. Additionally, a guide slot and a guide strip are provided between the strip-shaped slider 38 and the strip-shaped rod 41.

[0039] A driving block 10 is also provided within the ring of the C-shaped annular structure linkage guide ring 32. This driving block 10 has a triangular structure and is used to drive the C-shaped annular structure linkage guide ring 32. When both the chin guard 26 and the mask 29 are in their lowest positions in the initial state, and 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 annular straight edge section of the linkage guide ring 32 near the second rotating shaft 33. The right top corner of the triangular structure driving block 10 presses against the C-shaped ring, causing it to rotate clockwise around the second rotating shaft 33. This action pushes the mask 29 upward together, entering the linkage stage between the mask 29 and the chin guard 26. When the mask 29 reaches its upper limit, i.e., at the upper brim of the helmet, the right top corner of the triangular structure driving block 10 has rotated to the arc section of the C-shaped ring. At this point, the mask 29 can rotate independently downward or upward (disengaging from the linkage stage), and the chin guard 26 can continue to rotate upward and backward. When the chin guard 26 reaches its backward rotation limit (the rotation limiting point of the chin guard), the right top corner of the triangular structure driving block 10 has rotated to the left side of the arc section of the C-shaped ring, and the left top corner has rotated to the right side of the arc section. If the chin guard 26 needs to rotate forward and upward, and if the mask 29 is 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. The left top corner of the triangular structure driving block 10 contacts and presses against the inner ring of the C-shaped annular straight edge section of the linkage guide ring 32, the mask 29 is lifted to its upper limit. Alternatively, if the mask 29 has already been lifted to its upper limit, the left top corner of the triangular structure driving block 10 rotates back to the left of its original position at the open section of the C-shaped ring, allowing the mask 29 to rotate downward to its initial position again.

[0040] The triangular structure driving block 10 is of a hollow shaft structure. A port part on the side of the hollow shaft facing the rotating component mounting plate 4 is provided with raised teeth 19. The raised teeth 19 are engaged with a groove 20 on the other side of the driving gear 1, enabling the driving gear 1 to drive the driving block 10 to rotate together. The rotating component mounting plate 4 is of a D-shaped housing structure. a flange is provided at one side of the D-shaped housing structure facing the mounting slot 13. The flange on a vertical straight edge side of the D-shaped housing structure is a stepped flange. A C-shaped guide slot 5 is provided on the rotating component mounting plate 4 of the D-shaped housing structure. A through hole 35 for the first rotating shaft 6 to pass through is provided on the D-shaped housing enclosed by the C-shaped guide slot. Additionally, a mounting hole 36 is provided on the rotating component mounting plate 4 of the D-shaped housing structure. The mounting hole 36 fixedly mounts the rotating component mounting plate 4 onto the mounting slot 13 via a fastener (screw) 37. The rotating component of the chin guard includes a driving gear 1. The driving gear 1 meshes with a driven gear 2. The driven gear 2 is fixedly mounted near one end of the C-shaped guide slot 5 via a fixed shaft 3. The center of the driving gear 1 is provided with a stepped hole 7 that cooperates with the first rotating shaft 6. The first rotating shaft 6 is a hollow shaft. The first rotating shaft 6 has one end provided with an end cap 8 that cooperates with the stepped hole 7 and the other end provided with a radial slot 9. One end of the first rotating shaft 6 passes through the stepped hole 7 and a through hole 11 on the driving block 10, engaging with a projection 15 on a boss 14 within the mounting slot 13. The hollow shaft of the first rotating shaft 6 is connected to the mounting hole 16 on the boss 14 via a fastener (screw) 12.1. The driving gear 1 has an insertion slot 17 and a connecting hole 18 for the chin guard 26 on the annular surface between the driving teeth and the stepped hole 7. On the other annular surface of the driving gear 1 between the driving teeth and the stepped hole 7, there is a groove 20 that engages with the raised teeth 19 on the driving block 10. The driving gear 1 is an incomplete gear. The incomplete gear is provided with a projection 21 on the toothless annular surface. The projection 21 is provided with a radial positioning slot 22. The projection 21 protrudes out of the side surface of the driving gear 1 toward the side of the rotating component mounting plate 4 and slides in cooperation with the C-shaped guide slot 5; the radial positioning slot 22 cooperates with one radial positioning slider 23, and the radial positioning slider 23 and the radial positioning chute 24 slide in cooperation with each other. The radial positioning chute 24 is mounted on an inner side of the rotating component mounting plate 4 using fasteners, one end of the radial positioning slider 23 passes through the rotating component mounting plate 4 and is located on an 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 chute 24. Insertion teeth 27 that fit into the insertion slot 17 are provided at one side of the chin guard 26 facing the driving gear 1. The chin guard (26) is also provided with a mounting hole (28) corresponding to the connecting hole (18), and the fastener is installed in the connecting hole (18) and the mounting hole (28).

[0041] When the chin guard 26 is pushed to rotate, it drives the driving gear 1 to rotate through the engagement of the insertion teeth 27 and fasteners (screws) on its inner side with the insertion slot 17 and the connecting hole 18 on the annular surface of the driving gear 1. The grooves 20 on the other surface of the driving gear 1 engage with the raised teeth 19 on the driving block 10, causing the driving block 10 to rotate. Since the driving gear 1 is an incomplete gear, it cannot complete a full rotation, preventing the chin guard 26 from rotating a full circle. Moreover, a projection 21 is provided at one end of the teeth of the incomplete gear, and a radial positioning slot 22 is further provided on the projection 21. After the radial positioning slot 22 rotates to a set position, it is caught by a radial positioning slider 23 and can no longer continue to rotate. The radial positioning slider 23 slides in cooperation with the radial positioning chute 24 mounted on the inner side of the rotating component mounting plate 4 through an elastic member (spring) 25. The first rotating shaft 6 is a hollow shaft. The hollow shaft is connected via a fastener (screw) 12.1 passing through the hollow first rotating shaft 6 and the triangular driving block 10 to a mounting hole 16 provided on the boss of the mounting slot 13. When the driving gear 1 rotates, one side of the projection 21 at one end of the incomplete gear tooth slides in cooperation with the C-shaped guide slot 5 provided on the rotating component mounting plate 4.

[0042] The above description is only for the preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present utility model within the technical scope of the present utility model.

Claims

1. A rotating structure of a helmet chin guard, comprising a driving gear (1), a driven gear (2), a rotating component mounting plate (4), and a first rotating shaft (6), wherein the rotating component mounting plate (4) is provided with a C-shaped guide slot (5), and a through hole (35) is provided on the mounting plate housing enclosed by the C-shaped guide slot (5), the driving gear (1) meshes with the driven gear (2), and the driven gear (2) is fixedly mounted near one end of the C-shaped guide slot (5) of the rotating component mounting plate (4) via a fixed shaft (3), a stepped hole (7) that cooperates with the first rotating shaft (6) is provided at a center of the driving gear (1), and the first rotating shaft (6) passes through the stepped hole (7) and the through hole (35) to connect with a helmet body.

2. The rotating structure of a helmet chin guard according to claim 1, wherein the driving gear (1) is an incomplete gear which is provided with a projection (21) on a toothless annular surface of the incomplete gear, the projection (21) is provided with a radial positioning slot (22), a lateral projection protruding from the driving gear (1) is provided on a side of the projection (21) facing the rotating component mounting plate (4), and the lateral projection slides in cooperation with the C-shaped guide slot (5), a radial positioning slider (23) is also connected to the rotating component mounting plate (4), and the radial positioning slot (22) engages in cooperation with the radial positioning slider (23).

3. The rotating structure of a helmet chin guard according to claim 2, wherein the radial positioning slider (23) and the radial positioning chute (24) slide in cooperation with each other, the radial positioning chute (24) is mounted on an inner side of the rotating component mounting plate (4) using fasteners, one end of the radial positioning slider (23) passes through the rotating component mounting plate (4) and is located on an 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 chute (24).

4. The rotating structure of a helmet chin guard according to claim 1, wherein an insertion slot (17) and a connecting hole (18) for the chin guard (26) are provided on one circumferential surface between driving teeth of the driving gear (1) and the stepped hole (7).

5. The rotating structure of a helmet chin guard according to claim 4, wherein the insertion slot (17) is provided on an inner side of the driving gear (1) facing the chin guard (26), insertion teeth (27) that fit the insertion slot (17) are provided at an inner side of the chin guard (26), and the chin guard (26) is also provided with a mounting hole (28) corresponding to the connecting hole (18), and the fastener is installed in the connecting hole (18) and the mounting hole (28).

6. The rotating structure of a helmet chin guard according to claim 1, wherein the first rotating shaft (6) is a hollow shaft, the first rotating shaft (6) has one end provided with an end cap (8) which engages with the stepped hole (7) and the other end provided with a radial slot (9) and pass through the stepped hole (7) and engages with a projection (15) provided on the helmet body (12), and the hollow shaft of the first rotating shaft (6) is connected with a mounting hole (16) on the helmet body (12) via a fastener (12.1).

7. The rotating structure of a helmet chin guard according to claim 1, wherein a groove (20) is formed on the other circumferential surface between the driving tooth of the driving gear (1) and the stepped hole (7).

8. The rotating structure of a helmet chin guard according to claim 1, wherein the rotating component mounting plate (4) is of a D-shaped housing structure which is provided with a flange on a side facing a helmet body mounting slot (13), a flange on a side of a vertical straight edge of the D-shaped housing structure is a stepped flange, the rotating component mounting plate (4) of the D-shaped housing structure is further provided with a mounting hole (36), and the mounting hole (36) fixedly installs the rotating component mounting plate (4) onto the mounting slot (13) via a fastener (37).

9. A helmet, comprising a rotating structure of the helmet chin guard according to any one of claims 1 to 8.

10. The helmet according to claim 9, comprising a helmet body (12), wherein a mask (29) and a chin guard (26) are symmetrically hinged on two sides of the helmet body (12) via a mask rotating structure and a chin guard rotating structure, respectively, mounting slots (13) are symmetrically provided on two sides of the helmet body (12), a mask rotation limiter (30) and a rotating component mounting plate (4) are mounted in the mounting slots (13), and a mask mount (31) in the mask rotating structure is mounted on an inner side of the rotating component mounting plate (4), the mask (29) is connected to one end of the linkage guide ring (32) via the mask mount (31), the other end of the linkage guide ring (32) is hinged to the rotating component mounting plate (4) via a second rotating shaft (33) near the end, the annular groove (34) on the linkage guide ring (32) is provided therein with a driving block (10) cooperating with an inner side of the annular groove (34), and the driving block (10) passes through the rotating component mounting plate (4) via the first rotating shaft (6) and is connected to the chin guard rotating structure provided on the outer side of the rotating component mounting plate (4), the chin guard rotating structure is connected to the rotating component mounting plate (4) and the chin guard (26), respectively.

11. The helmet according to claim 10, wherein the mounting slots (13) are symmetrically provided on two sides of the helmet body (12) and are respectively provided as inwardly recessed grooves, the grooves have a two-layer stepped groove structure, the two-layer grooves are respectively a mounting slot (13) for the mask rotation limiter (30) located at a second layer and a mounting slot for the rotating component mounting plate (4) located at a first layer, the shape of the mounting slot (13) for the mask rotation limiter (30) conforms to the shape of the mask rotation limiter (30), and the shape of the mounting slot for the rotating component mounting plate (4) conforms to the shape of the rotating component mounting plate (4).

12. The helmet according to claim 10, wherein the driving block (10) is in the form of a triangular plate with a through hole (11) in the center and raised teeth (19) in the periphery of the through hole (11) on a side of the triangular plate facing the rotating component mounting plate (4).

13. The helmet according to claim 10, wherein the mask rotation limiter (30) comprises a strip-shaped slider (38) and a strip-shaped rod (41), two ends of the strip-shaped rod (41) are connected to the mounting slot (13) via fasteners (39) near the ends, 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 arch-shaped groove (43) for positioning the mask (29), and a toothed arc-shaped limiting guide slot is formed by a plurality of arch-shaped grooves with different curvature radii provided on the arch-shaped groove (43), the strip-shaped rod (41) and the strip-shaped slider (38) are each of a housing structure, and a side of the strip-shaped rod (41) and the strip-shaped slider (38) where the concave cavity is located faces the mounting slot (13).

14. The helmet according to claim 13, wherein the linkage guide ring (32) is of a C-shaped open ring structure, one end of the C-shaped open ring structure linkage guide ring (32) is connected to the mask mount (31), and a cylindrical projection (42) facing one side of the mounting slot (13) is provided near a connection part, and the cylindrical projection (42) cooperates with the arch-shaped groove (43) to limit the position of the mask; a first mounting hole (44) for 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) for the second rotating shaft (33) is provided on the rotating component mounting plate (4), the second rotating shaft (33) mounts the linkage guide ring (32) and the mask mount (31) on the rotating component mounting plate (4) via the first mounting hole (44), the second mounting hole (45), and a fastener, and causes the linkage guide ring (32) and the mask mount (31) to rotate on the rotating component mounting plate (4) about the second rotating shaft (33).

15. The helmet according to claim 10, wherein the mask mount (31) is of a strip arc-shaped surface structure, with one side of an outer arc-shaped surface of the strip arc-shaped surface structure being used for connection with the mask (29), and one side of an inner arc-shaped surface being used for connection with the linkage guide ring (32), or the mask mount (31) and the linkage guide ring (32) form an integral structure, the strip arc-shaped surface structure is provided with slots and / or raised edges on a side of the outer arc-shaped surface used for connection with the mask (29), and the width of the strip arc-shaped surface structure is greater than that of the linkage guide ring (32).

Images