A helmet

Abstract

The present invention discloses a helmet, comprising: a helmet body (1); a lens bracket (3) with a visor (2), rotatably mounted on the helmet body (1), and provided with an arc-shaped boss (31); a chin guard assembly, rotatably mounted on the helmet body (1), and provided with an arc-shaped protrusion (71). In a first state, both the visor (2) and the chin guard assembly are at their lowest positions, and the arc-shaped boss (31) is located below the arc-shaped protrusion (71). When the chin guard assembly is raised, the arc-shaped boss (31) and the arc-shaped protrusion (71) come into abutment. When the arc-shaped boss (31) reaches the outer side of the arc-shaped protrusion (71), the arc-shaped protrusion (71) slides relative to the arc-shaped boss (31), allowing the chin guard assembly to continue moving upward. In a second state, the visor (2) is at its lowest position, and the chin guard assembly is at its rearmost position. The arc-shaped boss (31) and the arc-shaped protrusion (71) are in abutment. When the chin guard assembly is lowered, the arc-shaped protrusion (71) pushes the arc-shaped boss (31), driving the visor (2) to reach its highest position. The chin guard assembly continues to move downward. As a result, the problem of the current helmet's structure and functionality being too limited to meet the diverse needs of users is resolved.

Description

[0001] A helmet

[0002] This application claims the benefit of Chinese Patent Application CN118948002A, filed 30.09.2024.

[0003] TECHNICAL FIELD

[0004] The present invention relates to the field of personal protective equipment technology, specifically to a helmet.

[0005] BACKGROUND TECHNOLOGY

[0006] Helmets play a crucial protective role during riding. However, while ensuring protective functionality, they must also meet the wearing needs of different users. Currently, helmets on the market are mainly of two types: full-face helmets, where the helmet shell and the chin guard are fixed as an integral unit with an immovable chin guard; and half-face helmets, which have only the helmet shell without a chin guard. In practical use, different application scenarios require different types of helmets. The current helmets cannot meet the diverse needs of users.

[0007] Therefore, there is an urgent need for a skilled person in the field to design a helmet with a movable chin guard, integrating the functionalities of both half-face and fullface helmets.

[0008] SUMMARY OF THE INVENTION

[0009] The objective of the present invention is to provide a helmet with a removable chin guard, integrating the functionalities of half-face and full-face helmets to address the problem of limited application scenarios for existing helmets.

[0010] To achieve this objective, the present invention provides a helmet comprising: a helmet body; a lens bracket with a visor, rotatably mounted on the helmet body, and provided with an arc-shaped boss; a chin guard assembly, rotatably mounted on the helmet body, and provided with an arc-shaped protrusion facing the arc-shaped protrusion; the rotation center of the lens bracket is farther from the visor than the rotation center of the chin guard assembly; furthermore, the two rotation centers have a height difference in the height direction of the visor; the length of the arc-shaped protrusion is greater than the length of the arc-shaped boss.

[0011] In a first state, both the visor and the chin guard assembly are at their lowest positions. The arc-shaped boss is located below the arc-shaped protrusion. By raising the chin guard assembly, the chin guard assembly drives the visor to move synchronously. When the arc-shaped boss and the arc-shaped protrusion come into abutment, the arc-shaped protrusion pushes the arc-shaped boss to move until the arc-shaped boss reaches the outer side of the arc-shaped protrusion. The visor then reaches its highest position. The arc-shaped protrusion slides relative to the arcshaped boss, allowing the chin guard assembly to continue moving upward relative to the visor.

[0012] In a second state, the visor is at its lowest position, and the chin guard assembly is at its rearmost position. The arc-shaped boss and arc-shaped protrusion are in abutment. The arc-shaped protrusion is farther from the rotation center of the lens bracket than the arc-shaped boss. By lowering the chin guard assembly, the arcshaped protrusion pushes the arc-shaped boss to move, driving the visor to reach its highest position. The arc-shaped boss moves to the outer side of the arc-shaped projection. The arc-shaped protrusion slides relative to the arc-shaped boss, allowing the chin guard assembly to continue moving downward relative to the visor.

[0013] Preferably, the arc-shaped protrusion comprises a pointed end at its first end. The pointed end is located at the inner edge of the arc-shaped protrusion. In the first state, the pointed end faces the arc-shaped boss. When the pointed end and the arcshaped protrusion come into abutment, the pointed end guides the arc-shaped boss to the outer edge of the arc-shaped protrusion as the arc-shaped protrusion rotates.

[0014] Preferably, the arc-shaped protrusion comprises an abutting end at its second end. In the second state, the arc center corresponding to the arc-shaped boss is at the side closer to the arc-shaped protrusion. The abutting end abuts one side of the arcshaped protrusion. By lowering the chin guard assembly, the abutting end lifts the arc-shaped protrusion upward, driving the visor to reach its highest position.

[0015] Preferably, the helmet body is fixed with a rotational position base. The rotational position base comprises a first sliding groove and a second sliding groove. The first and second sliding grooves are respectively provided at different locations along the thickness direction of the rotational position base. The lens bracket is slidably connected to the first sliding groove, and the chin guard assembly is slidably connected to the second sliding groove. Both ends of the first sliding groove are provided with locking ends for fixing the position of the lens bracket.

[0016] Preferably, the chin guard assembly comprises a rotating disk and a chin guard body, which are fixedly connected. The rotating disk is provided with the arc-shaped protrusion, and the chin guard body is located at the outside of the helmet body.

[0017] Preferably, the chin guard body is provided with three fixing holes which are arranged in a triangular distribution with equal spacing. Each fixing hole is used to install fixing components to connect the chin guard body to the rotating disk. The chin guard body is provided with a cover plate to shield the fixing components.

[0018] Preferably, the rotational position base comprises a limiting groove. One end of the limiting groove is provided with a limiting component. The limiting groove is located between the first sliding groove and the second sliding groove. A fixing groove is located at the outer edge of the rotating disk. When the chin guard assembly is in its rearmost position, the fixing groove engages with the limiting component to lock the position of the chin guard assembly.

[0019] Preferably, the helmet body is fitted with a fixed base. The fixed base encloses the lens bracket and the rotational position base on the helmet body. The fixed base is also rotatably connected to the rotating disk, allowing the arc-shaped protrusion on one side of the rotating disk to extend inward and abut the arc-shaped boss of the lens bracket.

[0020] Preferably, one end of the lens bracket away from the rotating disk is provided with a snap-fit groove. The snap-fit groove houses a first elastic component. One side of the first elastic component abuts the snap-fit groove, while the other side connects to a snap-fit component. After the visor snaps into the snap-fit groove, the first elastic component applies elastic force to the snap-fit component to fix the visor.

[0021] Preferably, the chin guard body supports the visor. When the chin guard body rotates upward, it can push the visor to move synchronously. Compared with the aforementioned background technology, the present invention provides a helmet comprising a helmet body, a chin guard assembly, and a lens bracket with a visor. The chin guard assembly can rotate relative to the helmet body, enabling synchronized movement of the visor during the opening and closing actions of the chin guard assembly. The lens bracket is designed to support the visor. One end of the visor is also connected to the helmet body. The lens bracket can rotate relative to the helmet body around its connection point with the helmet body. Additionally, the lens bracket is provided with an arc-shaped boss to drive the entire lens bracket to rotate. The chin guard assembly has an arc-shaped protrusion. The arc-shaped protrusion can extend inside the helmet body and come into abutment with the arc-shaped boss on the lens bracket. As the arc-shaped protrusion rotates, it drives the arc-shaped boss to move synchronously.

[0022] When the helmet transitions from a closed to an open state, both the visor and the chin guard assembly are at their lowest positions. The user pushes the chin guard assembly upward, causing the arc-shaped protrusion inside the chin guard assembly to rotate. The lens bracket is connected to the helmet body. The lens bracket can rotate relative to the helmet body. As the arc-shaped protrusion of the chin guard assembly abuts the arc-shaped boss of the lens bracket, the arc-shaped protrusion pushes the arc-shaped boss as the chin guard assembly rotates. The arc-shaped boss drives the lens bracket to rotate, pushing the visor upward. Once the visor reaches its highest position, the arc-shaped boss remains stationary with the lens bracket, and the contact surfaces of the arc-shaped boss and the arc-shaped protrusion align. As the arc-shaped protrusion slides relative to the arc-shaped boss, the chin guard assembly can continue to rotate, ultimately pushing the visor to the upper side of the helmet and the chin guard assembly to the rear side of the helmet body.

[0023] Furthermore, when the helmet is in the half-face helmet mode, the chin guard assembly is positioned at the rear side of the helmet body and the visor is at its lowest position. In this mode, when the user pushes the chin guard assembly, the arc-shaped protrusion within the chin guard assembly pushes the arc-shaped boss on the lens bracket to move. In this half-face helmet mode, the arc of the arc-shaped protrusion is oriented opposite to the arc of the arc-shaped boss. The arc-shaped protrusion of the chin guard assembly moves downward, while the arc-shaped boss on the lens bracket moves upward. When the user pushes the chin guard assembly downward, the visor is lifted. When the visor reaches its highest position, the arc- shaped boss on the lens bracket slides again against the arc-shaped protrusion of the chin guard assembly. The chin guard continues to be pushed downward until it reaches the lowest point, transitioning the helmet into the full-face helmet mode.

[0024] The present invention enables the chin guard assembly to be pushed to different positions, achieving coordinated movement between the visor and the chin guard assembly. This design allows the helmet to switch between the half-face helmet mode and the full-face helmet mode, making it suitable for various scenarios.

[0025] DESCRIPTION OF DRAWINGS

[0026] To provide a clearer explanation of the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or prior art are briefly introduced below. It should be noted that the drawings described below represent only the embodiments of the present invention. For a skilled person in the art, other drawings can be derived from the provided drawings without any inventive effort.

[0027] Figure 1 : A schematic diagram of an assembly of various components of a helmet provided in an embodiment of the present invention.

[0028] Figure 2: A positional relationship diagram of an arc-shaped boss and an arc-shaped protrusion in a first state of the helmet provided in the embodiment of the present invention.

[0029] Figure 3: A positional relationship diagram of the arc-shaped boss and the arcshaped protrusion in a second state of the helmet provided in the embodiment of the present invention.

[0030] Figure 4: A positional relationship diagram of the arc-shaped boss and the arcshaped protrusion during the movement of a chin guard assembly from the rearmost position to the lowest position provided in the embodiment of the present invention.

[0031] Figure 5: A structural diagram of a rotational position base provided in the embodiment of the present invention. Figure 6: A structural diagram of the chin guard assembly provided in the embodiment of the present invention.

[0032] Figure 7: A structural diagram of a lens bracket provided in the embodiment of the present invention.

[0033] Figure 8: A structural diagram of a fixed base provided in the embodiment of the present invention.

[0034] Figure 9: A structural diagram of a chin guard body provided in the embodiment of the present invention.

[0035] Figure 10: A structural diagram of the fixed base and the helmet body provided in the embodiment of the present invention.

[0036] Figure 11 : A structural diagram of the lens bracket, a rotating disk, and the rotational position base provided in the embodiment of the present invention.

[0037] Figure 12: A structural diagram of the assembly of the lens bracket, the rotating disk, the rotational position base, and the fixed base provided in the embodiment of the present invention.

[0038] Wherein, 1 - helmet body; 2 - visor; 3 - lens bracket; 31 - arc-shaped boss; 32 - locking groove; 33 - snap-fit groove; 34 - first sliding block; 35 - snap-fit component ; 36 - swing arm; 37 - mounting base; 4 - rotational position base; 41 - first sliding groove; 42 - second sliding groove; 43 - locking end; 44 - limiting component; 45 - limiting groove; 5 - fixed base; 51 - mounting hole; 52 - snap-fit angle; 6 - chin guard body; 61 - fixing hole; 7 - rotating disk; 71 - arc-shaped protrusion; 711 - pointed end; 712 - abutting end; 72 - second sliding block; 73 - fixing groove; 8 - cover plate.

[0039] DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] The technical solutions in the embodiments of the present invention will be clearly and comprehensively described below in conjunction with the accompanying drawings. It is evident that the described embodiments are merely part of the present invention, not all of its embodiments. Based on the embodiments of the present invention, all other embodiments that a person skilled in the art can obtain without inventive effort fall within the scope of the present invention.

[0041] To help a person skilled in the art better understand the solution of the present invention, the invention will be further explained in detail below with reference to the accompanying drawings and specific embodiments.

[0042] Figure 1 illustrates a helmet provided by the present invention. The helmet comprises: a helmet body 1 , a visor 2, a lens bracket 3, a chin guard assembly, wherein the visor 2 is mounted in conjunction with the lens bracket 3, and the helmet body 1 serves as the carrier for all components.

[0043] Both sides of the helmet body 1 reserve mounting cavities. Within the cavity, a lens bracket 3 is installed. During assembly, the lens bracket 3 is first placed into the mounting cavity such that one end of the lens bracket 3 connects to the helmet body 1. Since only one end of the lens bracket 3 is independently connected to the helmet body 1 , the lens bracket 3 can rotate around its one end.

[0044] As shown in Figure 1, the chin guard assembly is embedded within the helmet body 1 without any fixed connectors between them. This means the chin guard assembly can rotate relative to the helmet body 1.

[0045] As shown in Figure 7, one side of the lens bracket 3 is provided with an arc-shaped boss 31. The arc-shaped boss 31 is positioned at the side of the lens bracket 3 away from the helmet body 1. Both lateral sides of the arc-shaped boss 31 are arc surfaces facing toward the end of the lens bracket 3 that mounts the visor 2, and the arc surfaces at both ends are connected by flat surfaces.

[0046] Figure 6 shows that the chin guard assembly has an arc-shaped protrusion 71. The arc-shaped protrusion 71 is located at the side of the chin guard assembly facing the helmet body 1. The two lateral sides of the arc-shaped protrusion 71 are two parallel arc surfaces. One end of the outer arc surface of the arc-shaped protrusion 71 curves inward to connect with one end of the other arc surface, while the other ends of the two arc surfaces of the arc-shaped protrusion 71 are connected by a flat surface. The arc-shaped protrusion 71 extends inside the helmet body 1 and abuts the arc-shaped boss 31 on the lens bracket 3. When the chin guard assembly rotates, the arc- shaped protrusion 71 pushes the arc-shaped boss 31 , driving the lens bracket 3 to rotate synchronously with the chin guard assembly.

[0047] In some embodiments, the transition of the helmet from a full-face face helmet state to a half-face helmet state, as well as the positional relationship between the arcshaped boss 31 and the arc-shaped protrusion 71 in the full-face helmet state are as shown in Figure 2.

[0048] Figure 2 illustrates the positional relationship between the arc-shaped boss and arcshaped protrusion in a first state. In this state, both the visor 2 and the chin guard assembly are in their lowest positions. The arc-shaped boss 31 is located below the arc-shaped protrusion 71 , with a certain gap between them.

[0049] When the chin guard assembly needs to be raised, the arc-shaped protrusion 71 rotates counterclockwise as shown in Figure 2. The chin guard assembly and visor 2 come into contact. The visor 2 is driven to move upward synchronously as the chin guard assembly is raised. The arc-shaped boss 31 rotates counterclockwise. The lens bracket 3 and visor 2 move synchronously until the arc-shaped boss 31 and arcshaped protrusion 71 come into contact.

[0050] Since the rotation center O of the lens bracket 3 and the rotation center O' of the arcshaped protrusion 71 do not coincide, the rotational speeds of the arc-shaped boss 31 and the arc-shaped protrusion 71 differ. The rotational speed of the arc-shaped boss 31 is greater than the rotational speed of the arc-shaped protrusion 71.

[0051] Therefore, at certain point the arc-shaped boss 31 and the arc-shaped protrusion 71 come into contact.

[0052] When the arc-shaped boss 31 and the arc-shaped protrusion 71 come into abutment, the arc-shaped protrusion 71 pushes the arc-shaped boss 31 to move. At this point, the chin guard assembly and the visor 2 disengage, and the lifting of the visor 2 is entirely due to the force between the arc-shaped boss 31 and the arc-shaped protrusion 71 . The lifting of the visor 2 continues until the arc-shaped boss 31 moves to the outer side of the arc-shaped protrusion 71 . The visor 2 reaches its highest position. The arc-shaped protrusion 71 slides relative to the arc-shaped boss 31 , allowing the chin guard assembly to continue moving upward relative to the visor 2. Since both the contact surfaces of the arc-shaped boss 31 and the arc-shaped protrusion 71 are arc surfaces and an angle exists between the contacting arc surfaces, the outer arc surface of the arc-shaped protrusion 71 can drive the inner arc surface of the arc-shaped boss 31 to rotate. However, as the lens bracket 3 rotates counterclockwise, the angle between the arc surfaces of the arc-shaped boss 31 and the arc-shaped protrusion 71 gradually decreases. When the angle between the contacting arc surfaces reduces to 0°, the two arc surfaces are tangent. At this point, the contact between the arc surfaces only results in sliding motion, and the arcshaped protrusion 71 can no longer exert a pushing force on the arc-shaped boss 31. Consequently, the arc-shaped boss 31 remains stationary. If the chin guard assembly continues to rotate, only the arc-shaped protrusion 71 slides relative to the arcshaped boss 31. After this sliding motion, the arc-shaped protrusion 71 separates from the arc-shaped boss 31 , and the lens bracket 3 reaches its upper rotational limit. The chin guard assembly can then continue rotating until it reaches the rear side of the helmet body 1.

[0053] Besides, when the helmet is in the half-helmet mode, the chin guard assembly is rotated to the rear side of the helmet body 1, and the visor 2 is in its lowest position, as shown in Figure 3 of the description.

[0054] Figure 3 illustrates the positional relationship between the arc-shaped boss and the arc-shaped protrusion in a second state. At this state, the arc-shaped boss 31 of the lens bracket 3 abuts the flat end of arc-shaped protrusion 71 of the chin guard assembly.

[0055] In the second state, the visor 2 is at its lowest position, and the chin guard assembly is in its rearmost position. In this state, when the helmet is worn, the visor 2 is positioned in front of the wearer’s eyes, while the chin guard assembly is located behind the wearer’s head. The arc-shaped boss 31 and the arc-shaped protrusion 71 are in abutment, and the arc-shaped protrusion 71 is farther from the rotation center O of the lens bracket 3 than the arc-shaped boss 31.

[0056] By lowering the chin guard assembly, the arc-shaped protrusion 71 moves clockwise, abutting the arc-shaped boss 31. This interaction drives the arc-shaped boss 31 to move clockwise, raising the visor 2 to its highest position, with the arc-shaped boss 31 moving to the outer side of the arc-shaped protrusion 71, as shown in Figure 4 of the description. After this, the arc-shaped protrusion 71 can continue sliding relative to the arcshaped boss 31 , i.e. rotating clockwise. During this time, the arc-shaped boss 31 remains stationary in its current position, and the chin guard assembly continues to move downward relative to the visor 2.

[0057] The arc-shaped boss 31 can rotate within a preset range. When the user needs to switch to the full-face helmet mode, he can push the chin guard assembly at the rear of the helmet body 1 forward. This action causes the arc-shaped protrusion 71 on the chin guard assembly to rotate clockwise and upward. Since the rotation centers of the arc-shaped boss 31 and the arc-shaped protrusion 71 are distributed on opposite sides of their contact surfaces, the arc-shaped boss 31 rotates in the direction opposite to the arc-shaped protrusion 71. The arc-shaped boss 31 rotates counterclockwise and upward. This motion is reflected in the visor 2 and the chin guard assembly as follows: Pushing the chin guard assembly toward its starting point raises the visor 2 to its highest point. At this point, the contact surface of the arcshaped boss 31 on the lens bracket 3 aligns with the outer arc surface of the arcshaped protrusion 71. The arc-shaped boss 31 and the arc-shaped protrusion 71 engage in sliding motion only, leaving the visor 2 stationary. When the chin guard assembly continues rotating to its lowest position, the helmet transitions from the halfface mode to the full-face mode.

[0058] When the chin guard assembly does not reach its endpoint, and the visor 2 is at its highest point, the positional relationship between the arc-shaped boss 31 and the arc-shaped protrusion 71 is as shown in Figure 4. At this point, the inner edge of the arc-shaped boss 31 on the lens bracket 3 aligns with the outer edge of the arcshaped protrusion 71 on the chin guard assembly. Between the arc-shaped boss 31 and the arc-shaped protrusion 71 , only the latter can slide along its trajectory, remaining within the motion path of the arc-shaped boss 31 until the arc-shaped protrusion 71 reaches its endpoint. If the visor 2 is pushed at this point, the arcshaped boss 31 tends to rotate clockwise. The arc-shaped boss 31 abuts the arcshaped protrusion 71. The arc-shaped boss 31 only exerts a force pointing toward the arc center of the contact surface between the arc-shaped boss 31 and the arcshaped protrusion 71 . The arc-shaped boss 31 cannot exert a force on the arcshaped protrusion 71 in the tangential direction of the contact surface. As a result, the arc-shaped boss 31 cannot rotate the arc-shaped protrusion 71. Only when the chin guard assembly reaches the rear side of the helmet body 1 and the arc-shaped protrusion 71 rotates to the endpoint of its path, the arc-shaped boss 31 and the arcshaped protrusion 71 disengage. The visor 2 can rotate freely only when there is no obstacle in the motion path of the arc-shaped boss 31 .

[0059] In some embodiments, as shown in Figure 2, a first end of the arc-shaped protrusion 71 is provided with a pointed end 711. The pointed end 711 is located on the inner edge of the arc-shaped protrusion 71. In the first state, the pointed end points toward the arc-shaped boss 31. When the pointed end and the arc-shaped protrusion 71 come into abutment, the pointed end guides the arc-shaped boss 31 toward the outer edge of the arc-shaped protrusion 71 as the arc-shaped protrusion 71 rotates.

[0060] This configuration ensures reliable contact between the arc-shaped boss 31 and the arc-shaped protrusion 71. This configuration also ensures that the pointed end 711 of the arc-shaped protrusion 71 is able to push the arc-shaped boss 31 to move. At the same time, the pointed end 711 reduces the force exerted by the pointed end 711 on the arc-shaped boss 31 , preventing the arc-shaped boss 31 from being crushed by the arc-shaped protrusion 71.

[0061] In some embodiments, as shown in Figure 3, a second end of the arc-shaped protrusion 71 is provided with an abutting end 712. In the second state, the arc center corresponding to the arc-shaped boss 31 is at the side closer to the arc-shaped protrusion 71. The abutting end abuts one side of the arc-shaped protrusion 71. By lowering the chin guard assembly, the abutting end pushes the arc-shaped protrusion upward, enabling the visor 2 to move to its highest position.

[0062] In this configuration, through the radian settings in the arc-shaped boss 31 , the arcshaped boss 31 is able to move upward, i.e. clockwise, under the pushing action of the abutting head 712 of the arc-shaped protrusion 71 . In this way, it ensures that the visor 2 and the lens bracket 3 are lifted effectively.

[0063] As shown in Figures 6 and 9 of the description, the chin guard assembly comprises a rotating disk 7 and a chin guard body 6. The rotating disk 7 is provided with the arcshaped protrusion 71 at the side closer to the helmet body 1. The chin guard body 6 is positioned outside the helmet body 1 to prevent collisions between the chin guard body 6 and the helmet body 1 during the rotation of the chin guard body 6. The chin guard body 6 has three fixing holes 61 on its side. The three fixing holes are arranged in a triangular distribution with equal spacing. Fixing components are fitted into the fixing holes to securely connect the chin guard body 6 to the rotating disk 7. When the chin cover 6 is pushed, it can drive the rotating disk 7 to move together. This configuration prevents positional displacement or loosening between the rotating disk 7 and the chin guard body 6, and also avoids delays in the synchronized motion between the rotating disk 7 and the chin guard body 6. Consequently, the user’s experience with the helmet is enhanced. A cover plate 8 is placed over the fixing components to protect them from damage and enhance the helmet’s aesthetics.

[0064] As shown in Figures 1 and 5, the helmet body 1 also comprises a rotational position base 4. The rotational position base 4 is located within the mounting cavity. The rotational position base 4 has a first sliding groove 41 and a second sliding groove 42. The lens bracket 3 and the rotating disk 7 are provided with a first sliding block 34 and a second sliding block 72, respectively. The first sliding block 34 fits into the first sliding groove 41 , while the second sliding block 72 fits into the second sliding groove 42. The lens bracket 3 and the rotating disk 7 are slidably connected to the rotational position base 4. Each sliding block is restrained to move in its corresponding sliding groove following a preset trajectory, and therefore the rotation of the lens bracket 3 and the rotating disk 7 is restrained. In addition, the second sliding groove 42 is located at the side of the arc center of the first sliding groove 41. The first sliding groove 41 and the second sliding groove 42 are located at different positions in the thickness direction of the rotational position base. The second sliding groove 42 is positioned in a circular cavity on the inner side of the rotational position base 4, and therefore the second sliding groove 42 is closer to the helmet body 1 than the first sliding groove 41. When the second sliding block 72 on the rotating disk 7 is inserted into the second sliding groove 42, the arc-shaped protrusion 71 on the same side of the rotating disk 7 as the second sliding groove 42 extends into a reserved hole in the rotational position base 4, establishing firm abutment with the arc-shaped boss 31 on the lens bracket 3.

[0065] Wherein, the first sliding groove 41 and second sliding groove 42 are both designed as arc-shaped grooves; the arc of the first sliding groove 41 corresponds to an angle of 38°, meaning the rotation center O of the lens bracket 3 can rotate by up to 38°; the arc of the second sliding groove 42 corresponds to an angle of 195°, meaning the rotation center O' of the lens bracket 3 can rotate by up to 195°; Point a marks the starting point of rotation, and Point b marks the endpoint of rotation; when the chin guard assembly and the visor 2 are both at their lowest positions, the sliding blocks are located at the starting ends of their respective grooves; both ends of the first sliding groove 41 are provided with locking ends 43 to ensure the stability of the first sliding block 34 at the starting point and the endpoint of the sliding groove, preventing unintended sliding.

[0066] In some embodiments, as shown in Figures 8,10, and 12, the helmet body 1 also has a fixed base 5 at the opening of the installation cavity. The fixed base 5 is a cover plate with edges that fit the inside of the cavity. One side of the fixed base 5 comprises a snap-fit angle 52. The snap-fit angle 52 is arranged perpendicularly to the fixed base 5. Outward-extending latches are placed at the edges of the snap-fit angle 52. When the fixed base 5 seals the opening of the installation cavity, the snap- fit angle 52 inserts into the helmet body 1 with the fixed base 5 and snaps into the helmet body 1. The fixed base 5 is fixed to the helmet body 1 through the fixing the snap-fit angle 52. In this configuration, the fixed base 5 and the inner surface of the installation cavity can fix the lens bracket 3 and the rotational position base 4 to the inside of the helmet body 1 by means of clamping. The fixed base 5 also has a mounting hole 51. The edge of the mounting hole 51 aligns with the lateral side of the rotating disk 7, allowing a rotational connection between the rotating disk 7 and the fixed base 5. The end surface of the rotating disk 7 away from the helmet body 1 aligns with the outer surface of the fixed base 5, while the other end surface extends into the circular cavity of the rotational position base 4. The second sliding block 72 fits into the second sliding groove 42, enabling the abutment between the arc-shaped protrusion 71 and the arc-shaped boss 31 on the lens bracket 3.

[0067] In some embodiments, as shown in Figure 7, the lens bracket 3 comprises a mounting base 37 and a swing arm 36. The swing arm 36 is positioned at one end of the mounting base 37. The mounting base 37 is placed perpendicular to the swing arm 36. The mounting base 37 is provided with a snap-fit groove 33. The snap-fit groove 33 is placed in the same direction as the visor 2. The swing arm 36 is provided with a locking groove 32 and the arc-shaped boss 31. The locking groove 32 is placed in the same direction as the swing arm 36. The arc-shaped boss 31 is placed at a certain angle relative to the swing arm 36.

[0068] The snap-fit groove 33 is used to secure the visor 2. A snap-fit component 35 and a first elastic component are placed in the snap-fit groove 33. One end of the first elastic component is connected to the inner wall of the snap-fit groove 33, and the other end abuts the snap-fit component 35. The first elastic component pushes the snap-fit component 35 so that the snap-fit component 35 tightly secures the visor 2, ensuring stable installation of the visor. A second elastic component and the first sliding block 34 are placed in the locking groove 32 of the swing arm 36. When the second elastic component is positioned at the starting segment of the first sliding groove 41, the second elastic component applies elastic force to the first sliding block 34, pushing the first sliding block 34 into the locking end 43 at the starting end of the first sliding groove 41. As a result, the first sliding block 34 located at the starting position is locked. To allow the first sliding block 34 to slide, the elastic force of the second elastic component must be overcome.

[0069] When the first sliding block 34 slides to the endpoint of the first sliding groove 41 and finishes sliding, the second elastic component pushes the first sliding block 34 into the locking end 43 at the endpoint of the first groove, thereby locking the sliding block at the endpoint of the sliding groove. The starting point and the endpoint of the first sliding block 34 correspond to the starting point and the endpoint of the lens bracket 3. The first sliding groove 41 restricts the angle to which the lens bracket 3 can lift, providing the visor 2 with two stable states: closed blocking and open raised. The locking ends 43 ensure stability in both states, preventing unintended sliding of the visor 2.

[0070] Furthermore, the rotating disk 7 is connected to the chin guard body 6. The chain guard body 6 supports the visor 2. Thus, when both the chin guard body 6 and the lens bracket 3 are at their lowest positions, the first sliding block 34 of the lens bracket 3 is situated within the locking end 43 at the starting point of the first sliding groove 41. At this point, the locking effect of the first sliding block 34 on the lens bracket 3 also applies to the chin guard body 6 and its fixed rotating disk 7. Similarly, when the chin guard body 6 is lifted, it can raise the visor 2 supported by it to a certain angle.

[0071] Additionally, as shown in Figures 5 and 11, a limiting groove 45 is positioned between the first sliding groove 41 of the rotational position base 4 and the rotating disk 7. The limiting groove 45 is an arc-shaped groove with an angle of 195°, and one end of the limiting groove 45 has a limiting component 44. The rotating disk 7 has a fixing groove 73 on its edge. The fixing groove 73 rotates with the rotating disk 7. When the rotating disk 7 rotates to its endpoint, the limiting component 44 snaps into the fixing groove 73, locking the positions of the rotating disk 7 and the chin guard body. This further ensures the stability of the helmet in its half-face state. In this description, relational terms such as "first" and "second" are used solely to distinguish one entity from another and do not necessarily imply any specific relationship or order between the entities. The principles and implementation methods of the present invention have been explained through specific embodiments. These embodiments are provided to aid in understanding the invention's methods and core concepts. It should be noted that for a skilled person in the art, various improvements and modifications can be made to the invention without departing from its principles. Such improvements and modifications are also within the scope of the invention's protection.

Claims

CLAIMS1. A helmet, characterized by comprising: a helmet body (1); a lens bracket (3) with a visor (2), and rotatably mounted on the helmet body (1), wherein the lens bracket (3) is provided with an arc-shaped boss (31); a chin guard assembly, rotatably mounted on the helmet body (1), and provided with an arc-shaped protrusion (71) facing the arc-shaped boss (31), wherein the rotation center of the lens bracket (3) is farther from the visor (2) than the rotation center of the chin guard assembly, and the two rotation centers have a height difference along the height direction of the visor (2), wherein the length of the arc-shaped protrusion (71) is greater than the length of the arc-shaped boss (31); in a first state, both the visor (2) and the chin guard assembly are at their lowest positions, and the arc-shaped boss (31) is located below the arc-shaped protrusion (71); by raising the chin guard assembly, the chin guard assembly drives the visor (2) to move synchronously; when the arc-shaped boss (31) abuts the arc-shaped protrusion (71) come into abutment, the arc-shaped protrusion (71) pushes the arcshaped boss (31) to move until the arc-shaped boss (31) reaches the outer side of the arc-shaped protrusion (71); the visor (2) then reaches its highest position, and the arc-shaped protrusion (71) slides relative to the arc-shaped boss (31), allowing the chin guard assembly to continue moving upward relative to the visor (2); in a second state, the visor (2) is at its lowest position, and the chin guard assembly is at its rearmost position; the arc-shaped boss (31) and the arc-shaped protrusion (71) are in abutment; the arc-shaped protrusion (71) is farther from the rotation center of the lens bracket (3) than the arc-shaped boss (31); by lowering the chin guard assembly, the arc-shaped protrusion (71) pushes the arc-shaped boss (31), driving the visor (2) to reach its highest position; the arc-shaped boss (31) moves to the outer side of the arc-shaped protrusion (71), and the arc-shaped protrusion (71) slides relative to the arc-shaped boss (31), allowing the chin guard assembly to continue moving downward relative to the visor (2).

2. The helmet according to claim 1 , characterized in that the arc-shaped protrusion (71) comprises a pointed end (711) at its first end; the pointed end (711) is located at the inner edge of the arc-shaped protrusion (71); in the first state, the pointed end faces the arc-shaped boss (31); when the pointed end and the arc-shaped protrusion (71) come into abutment, the pointed end guides the arc-shaped boss (31) to the outer edge of the arc-shaped protrusion (71) as the arc-shaped protrusion (71) rotates.

3. The helmet according to claim 1 , characterized in that the arc-shaped protrusion (71) comprises an abutting end (712) at its second end; in the second state, the arc center corresponding to the arc-shaped boss (31) is at the side closer to the arcshaped protrusion (71); the abutting end abuts one side of the arc-shaped protrusion (71); by lowering the chin guard assembly, the abutting end lifts the arc-shaped protrusion (71) upward, driving the visor (2) to reach its highest position.

4. The helmet according to claim 1 , characterized in that the helmet body (1) is fixed with a rotational position base (4); the rotational position base (4) comprises a first sliding groove (41) and a second sliding groove (42); the first sliding groove (41) and the second sliding groove (42) are respectively provided at different locations along the thickness direction of the rotational position base (4); the lens bracket (3) is slidably connected to the first sliding groove (41), and the chin guard assembly is slidably connected to the second sliding groove (42); both ends of the first sliding groove (41) are provided with locking ends (43) for fixing the position of the lens bracket (3).

5. The helmet according to claim 4, characterized in that the chin guard assembly comprises a rotating disk (7) and a chin guard body (6); the rotating disk (7) and the chin guard body (6) are fixedly connected together; the rotating disk (7) is provided with the arc-shaped protrusion (71), and the chin guard body (6) is located at the outside of the helmet body (1).

6. The helmet according to claim 5, characterized in that the chin guard body (6) is provided with three fixing holes (61); the three fixing holes (61) are arranged in a triangular distribution with equal spacing; each fixing hole (61) is used to install fixing components to connect the chin guard body (6) to the rotating disk (7); the chin guard body (6) is provided with a cover plate (8) to shield the fixing components.

7. The helmet according to claim 6, characterized in that the rotational position base (4) comprises a limiting groove (45); one end of the limiting groove (45) is provided with a limiting component (44); the limiting groove (45) is located between the first sliding groove (41) and the second sliding groove (42); a fixing groove (73) is located at the outer edge of the rotating disk (7); when the chin guard assembly is in its rearmost position, the fixing groove (73) engages with the limiting component (44) to lock the position of the chin guard assembly.

8. The helmet according to claim 7, characterized in that the helmet body (1) is fitted with a fixed base (5); the fixed base (5) encloses the lens bracket (3) and the rotational position base (4) on the helmet body (1); the fixed base (5) is also rotatably connected to the rotating disk (7), allowing the arc-shaped protrusion (71) on one side of the rotating disk (7) to extend inward and abut the arc-shaped boss (31) of the lens bracket (3).

9. The helmet according to claim 8, characterized in that one end of the lens bracket (3) away from the rotating disk (7) is provided with a snap-fit groove (33); the snap-fit groove (33) houses a first elastic component; one side of the first elastic component abuts the snap-fit groove (33), while the other side connects to a snap-fit component (35); after the visor (2) snaps into the snap-fit groove (33), the first elastic component applies elastic force to the snap-fit component (35) to fix the visor (2).

10. The helmet according to claim 9, characterized in that the chin guard body (6) supports the visor (2); when the chin guard body (6) rotates upward, it can push the visor (2) to move synchronously.

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