Linkage device of goggles and jaw protection support and helmet

Abstract

The invention relates to a linkage device of goggles and a jaw protection support. The linkage device comprises a base, a first fixing shaft, a second fixing shaft, a first transmission part, a second transmission part and a shifting rod mechanism. The jaw protection support is hinged to the base, the first transmission part and the second transmission part are rotationally arranged on the first fixing shaft and the second fixing shaft respectively, the first transmission part and the second transmission part are in direct meshing transmission or meshing transmission through a synchronous belt, and the first transmission part is fixedly connected with a rotating shaft of the jaw protection support in the circumferential direction. The driving lever mechanism is fixedly connected with the second transmission part in the circumferential direction, so that when the chin protection support is turned forwards or backwards, the driving lever mechanism can synchronously rotate forwards or reversely to open the goggles, the front end of the goggles can retract backwards after the goggles are opened, the front end of the goggles avoids the movement path of the chin protection support, the front end of the goggles is prevented from interfering with swinging of the chin protection support, and the safety of the goggles is improved. Therefore, smooth opening and closing of the jaw protection support are facilitated, the helmet is kept compact in structure, and safety is improved.

Description

Technical Field

[0001] This invention relates to the field of helmet technology, and in particular to a linkage device for goggles and chin guards, and a helmet. Background Technology

[0002] A flip-up helmet, also known as a hinged helmet, is a motorcycle helmet that combines the high safety of a full-face helmet with the convenience of a half-face helmet. Its core design lies in the chin guard, which can be flipped up entirely backward via a mechanical structure on the side. This design allows riders to drink water, talk, or breathe without removing the helmet when stopped, greatly improving ease of use.

[0003] In related technologies, rear-flip helmets have an inherent mechanical structural contradiction in their design: when the rider flips the visor upwards, the rotation trajectory of the chin guard can easily interfere with the front of the visor below. To solve this collision problem, it is usually necessary to increase the rotation radius of the chin guard so that it can avoid the visor when flipping. While this design compromise ensures smooth opening and closing of the visor, it directly leads to an outward expansion of the overall helmet profile. The increased gap between the chin guard and the face creates safety hazards and also makes the helmet too large.

[0004] Therefore, it is necessary to develop a new linkage device for goggles and chin guards, as well as a helmet, to improve the problems existing in the related technologies. Summary of the Invention

[0005] The purpose of this invention is to provide a linkage device for goggles and a chin guard, as well as a helmet, which can open the goggles in conjunction with the rotation of the chin guard to avoid collision between the front of the goggles and the chin guard.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] The present invention provides a linkage device for goggles and a chin support, comprising:

[0008] A base for connecting the helmet body and hinged to the chin guard;

[0009] The first fixed shaft and the second fixed shaft are disposed on the base;

[0010] The first transmission component and the second transmission component are rotatably mounted on the first fixed shaft and the second fixed shaft, respectively.

[0011] The first transmission component and the second transmission component can be directly meshed or meshed through a synchronous belt.

[0012] A lever mechanism is used to move the goggles on the helmet;

[0013] The first transmission component is circumferentially fixedly connected to the rotation axis of the chin support, and the lever mechanism is circumferentially fixedly connected to the second transmission component, so that when the chin support flips forward or backward, the lever mechanism can synchronously rotate forward or backward to open the goggles.

[0014] Furthermore, it also includes a lens mounting mechanism; the lens mounting mechanism is rotatably configured, and the goggles are mounted on the lens mounting mechanism; the lever mechanism abuts against the lens mounting mechanism when rotated, causing the goggles to open.

[0015] Furthermore, the lens mounting mechanism includes a swing arm structure; the lever mechanism has a first initial position and a second initial position when rotating forward and in reverse, respectively, and the distance between the first initial position and the swing arm structure is greater than that between the second initial position and the first initial position.

[0016] Furthermore, the swing arm structure includes a first fitting structure; the lever mechanism includes a first side profile structure, and when the lever mechanism is in the first initial position, the first fitting structure and the first side profile structure fit together.

[0017] Furthermore, the swing arm structure also includes a second fitting structure, which is located between the swing center of the first fitting structure and the swing arm structure; the lever mechanism includes a second side profile structure, which faces away from the first side profile structure; when the lever mechanism is in the second initial position, the second fitting structure and the second side profile structure are fitted together.

[0018] Furthermore, the first transmission component is an incomplete gear, and an outer limiting protrusion is provided after the circumferentially arranged teeth of the first transmission component. The outer limiting protrusion is higher than the teeth. A limiting structure is provided on the base facing away from the helmet body. The limiting structure is used to abut against the outer limiting protrusion to restrict the rotation of the first transmission component.

[0019] Furthermore, the limiting structure is an elastic structure. After the limiting structure is deformed by the outer limiting protrusion, the outer limiting protrusion passes through, allowing the first transmission member to continue rotating.

[0020] Furthermore, the base is provided with an annular limiting part, which is wound around the first fixed shaft; the first transmission component is sleeved on the annular limiting part; the outer side of the annular limiting part is provided with a stepped structure for abutting against the inner limiting protrusion on the inner ring of the first transmission component.

[0021] Furthermore, the first transmission component is connected to a spring for resetting the chin support.

[0022] The present invention also provides a helmet including the above-described linkage device.

[0023] Compared with the prior art, the linkage device for goggles and chin guard and the helmet provided by the present invention have the following beneficial effects:

[0024] 1. The present invention provides a linkage device for goggles and chin protectors, comprising: a base, a first fixed shaft, a second fixed shaft, a first transmission component, a second transmission component, and a lever mechanism; the chin protector is hinged to the base, the first transmission component and the second transmission component are rotatably mounted on the first fixed shaft and the second fixed shaft, respectively, and the first transmission component and the second transmission component are directly meshed or meshed through a synchronous belt; the first transmission component is circumferentially fixedly connected to the rotation axis of the chin protector, and the lever mechanism is circumferentially fixedly connected to the second transmission component, so that when the chin protector flips forward or backward, the lever mechanism can synchronously rotate forward or backward to open the goggles; after the goggles are opened, the front end retracts backward to avoid the movement path of the chin protector, thereby preventing the front end of the goggles from interfering with the swing of the chin protector. This facilitates the smooth opening and closing of the chin protector, maintains the compact structure of the helmet, and improves safety.

[0025] 2. The lens mounting mechanism includes a rotatable swing arm structure; the lever mechanism has two different initial positions, namely the first initial position and the second initial position, when rotating forward and backward respectively; since the chin support reaches the position of the goggles faster when performing the backward flipping action than the forward flipping action, and the distance between the first initial position and the swing arm structure is smaller than the distance between the second initial position and the swing arm structure, the lever mechanism is closer to the swing arm structure when rotating forward, and can reach the swing arm structure more quickly to open the goggles, thereby increasing the opening speed of the goggles when the chin support flips backward, and further reducing the risk of mechanical interference during the movement.

[0026] 3. The swing arm structure includes a first fitting structure and a second fitting structure, and the lever mechanism includes a first side profile structure and a second side profile structure. The second side profile structure and the first side profile structure face away from each other. When the lever mechanism is in the first initial position, the first fitting structure and the first side profile structure are fitted together. When the lever mechanism is in the second initial position, the second fitting structure and the second side profile structure are fitted together.

[0027] 4. The first transmission component is an incomplete gear structure. A limiting protrusion is provided behind the circumferentially arranged gear teeth, and the height of the limiting protrusion is higher than the gear teeth. A limiting structure is provided on the side of the base facing away from the helmet body. When the first transmission component rotates to a specific angle, the limiting protrusion will abut against the limiting structure on the base, thereby restricting its further rotation.

[0028] 5. The limiting structure is an elastic structure. After it comes into contact with the outer limiting protrusion, it deforms. The outer limiting protrusion causes the first transmission component to continue to rotate, thus playing a soft limiting role. The stepped structure on the outer side of the annular limiting part on the base abuts against the inner limiting protrusion on the inner ring of the first transmission component to achieve a hard limiting role.

[0029] 6. Furthermore, the first transmission component is connected to a spring, which can store elastic potential energy when the chin support is open. When the external force is removed, the spring releases the potential energy and drives the first transmission component to rotate in the opposite direction, thereby driving the chin support to automatically reset, which improves the ease of use. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the helmet structure in an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the connection structure of the chin support in this invention;

[0032] Figure 3 This is a schematic diagram of the connection structure of the base, the first transmission component, and the second transmission component in an embodiment of the present invention;

[0033] Figure 4 for Figure 3 The diagram shows the structure of the base.

[0034] Figure 5 for Figure 3 The diagram shows the structure of the first transmission component.

[0035] Figure 6 for Figure 2 A schematic diagram showing the connection structure between the lens mounting mechanism and the lever structure in the first initial position;

[0036] Figure 7 for Figure 6 The diagram shows the structure of the lever mechanism.

[0037] Figure 8 for Figure 6 The diagram shows the structure of the swing arm.

[0038] Figure 9 for Figure 2 The diagram shows the connection structure between the lens mounting mechanism and the lever structure in the second initial position.

[0039] Figure label:

[0040] 1. Base; 111. Limiting structure; 112. Annular limiting part; 1121. Stepped structure; 113. First fixed shaft;

[0041] 2. Lens mounting mechanism; 21. Swing arm structure; 211. First fitting structure; 212. Second fitting structure;

[0042] 3. Lever mechanism; 31. First side profile structure; 32. Second side profile structure;

[0043] 411. First transmission component; 4111. Transmission protrusion; 4112. Outer limiting protrusion; 4113. Inner limiting protrusion; 412. Second transmission component;

[0044] 51. Helmet body; 52. Chin protector;

[0045] 6. Goggles. Detailed Implementation

[0046] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0047] This invention provides a linkage device for goggles and a chin support, as described in the embodiments of the present invention. Figure 1 , Figure 2 and Figure 3 include:

[0048] Base 1, used to connect the helmet body 51 and hinge the chin guard 52;

[0049] The first fixed shaft 113 and the second fixed shaft are disposed on the base 1;

[0050] The first transmission component 411 and the second transmission component 412 are rotatably mounted on the first fixed shaft 113 and the second fixed shaft, respectively.

[0051] The first transmission component 411 and the second transmission component 412 can directly mesh or mesh through a synchronous belt.

[0052] The lever mechanism 3 is used to move the goggles 6 on the helmet;

[0053] The first transmission component 411 is circumferentially fixedly connected to the rotation axis of the chin support 52, and the lever mechanism 3 is circumferentially fixedly connected to the second transmission component 412, so that when the chin support 52 flips forward or backward, the lever mechanism 3 can synchronously rotate forward or backward to open the goggles 6.

[0054] In some specific embodiments, reference is made to Figure 3The first transmission component 411 is a driving gear, and the second transmission component 412 is a driven gear. The two mesh directly to transmit rotational motion. The first transmission component 411 and the second transmission component 412 can mesh internally or externally, can mesh with spur teeth or helical teeth, can be parallel shafts or intersecting shafts, and the gears can be incomplete gears, non-circular gears, etc. The present invention does not limit the specific form of gear transmission.

[0055] In other embodiments, the first transmission member 411 is a driving pulley and the second transmission member 412 is a driven pulley, both of which are provided with synchronous belts to transmit rotational motion. Similarly, the present invention does not limit the specific form of belt drive.

[0056] In some specific embodiments, reference is made to Figure 3 The side of the first transmission component 411 and the end face of the rotating shaft of the chin support 52 are provided with mutually cooperating transmission grooves or transmission protrusions 4111, which realize the transmission of rotational motion through the interlocking of the grooves and protrusions.

[0057] In some specific embodiments, reference is made to Figure 1 The helmet body 51 has a hollow structure and includes a facial opening. After the helmet body 51 covers the human head, the facial opening allows the human face to interact with the outside world. The chin guard 52 swings to cover the lower half of the facial opening, forming a chin guard area. This chin guard area covers the area where the jawbone is located after the helmet body 51 covers the human head. The goggles 6 swing to cover the upper half of the facial opening. The two ends of the chin guard 52 are respectively hinged to the two sides of the upper facial opening of the helmet body 51, allowing the chin guard 52 to flip forward to cover part of the facial opening and to flip backward to open the facial opening.

[0058] In some specific embodiments, reference is made to Figure 3 and Figure 6 The goggles 6 are mounted on the lens mounting mechanism 2, which is hinged to allow the goggles 6 to swing synchronously with it. When the chin support 52 flips back, the force and motion are transmitted through the first transmission component 411 and the second transmission mechanism 412, causing the lever mechanism 3 to rotate synchronously. When the lever on the lever mechanism 3 rotates, it lifts the lens mounting mechanism 2 from below, causing the lens mounting mechanism 2 to swing upward, thereby opening the goggles 6.

[0059] In some specific embodiments, reference is made to Figure 2 , Figure 3 and Figure 4During the chin support 52's backward flipping process, the lever of the lever mechanism 3 rotates synchronously and sequentially enters three states: not in contact with the lens mounting mechanism 2, in contact with the lens mounting mechanism 2, and disengaged from the lens mounting mechanism 2. When the lever is approximately perpendicular to the swing arm structure 21 of the lens mounting mechanism 2, the goggles 6 are opened to the maximum angle. Subsequently, the lever continues to rotate and disengages from the swing arm structure 21 of the lens mounting mechanism 2.

[0060] In some specific embodiments, after the lever is disengaged from the lens mounting mechanism 2, there is a certain gap between the lever and the lens mounting mechanism 2. At this time, the goggles 6 can be operated by the wearer to close downwards, and the closing angle depends on the size of the gap between the lever and the lens mounting mechanism 2.

[0061] In some specific embodiments, when the chin support 52 is flipped to its maximum stroke, the position of the chin support 52 can be locked by a locking structure. This can be achieved by existing technology known to those skilled in the art, and will not be described in detail here.

[0062] In some specific embodiments, if the chin guard 52 flips backward, the goggles 6 are opened in conjunction. The wearer then closes the goggles 6 downward, at which point the helmet is in the state where the chin guard 52 is flipped backward and the goggles 6 are closed. In this state, during the forward flip of the chin guard 52, the lever of the lever mechanism 3 synchronously returns to its original position. The lever reverses direction and goes through three states again: not in contact with the lens mounting mechanism 2, in contact with the lens mounting mechanism 2, and disengaged from the lens mounting mechanism 2, thus opening the goggles 6.

[0063] In some specific embodiments, the linkage device between the goggles 6 and the chin support 52 may be located only on one side of the upper facial opening of the helmet 51, with one end of the chin support 52 hinged to the linkage device and the other end directly hinged to the helmet 51.

[0064] In other embodiments, the two linkage devices can be respectively located on both sides of the opening on the upper part of the helmet body 51, and the two ends of the chin support 52 are respectively hinged to the two transmission devices.

[0065] In some embodiments of the present invention, the lens mounting mechanism 2 is rotatably configured, and the goggles 6 are mounted on the lens mounting mechanism 2; when the lever mechanism 3 is rotated, it abuts against the lens mounting mechanism 2, causing the goggles 6 to open.

[0066] In some embodiments of the present invention, reference is made to Figure 6 and Figure 9 The lens mounting mechanism 2 includes a swing arm structure 21; the lever mechanism 3 has a first initial position and a second initial position when rotating forward and in reverse, respectively, and the distance between the first initial position and the swing arm structure 21 is greater than that between the second initial position and the first initial position.

[0067] In some specific embodiments, reference is made to Figure 8 The swing arm structure 21 is an L-shaped hollow structure, and the lever mechanism 3 abuts against the swing arm structure 21 when rotating. It is directly hinged to the helmet body 51 or indirectly hinged to the helmet body 51 through the base 1. The end of the goggles 6 can be inserted for fixation. The swing arm structure 21 is provided with a mounting buckle, which is set inside the swing arm structure 21 by a spring. When the end of the goggles 6 is inserted into the swing arm structure 21, the mounting buckle is inserted into the groove at the end of the goggles 6 under the action of the spring, thereby fixing the goggles 6 in place.

[0068] In some specific embodiments, based on the transmission action of the first transmission member 411 and the second transmission member 412, the first initial position of the lever mechanism 3 corresponds to the initial position of the chin support 52 flipping backward, and the second initial position of the lever mechanism 3 corresponds to the initial position of the chin support 52 flipping forward.

[0069] In some specific embodiments, the "distance between the initial position of the lever mechanism 3 and the swing arm structure 21" refers to the position of the swing arm structure 21 when the goggles 6 are fully closed. The "distance between the initial position of the lever mechanism 3 and the swing arm structure 21" refers to the length of the trajectory of a point on the lever mechanism 3 from its initial position until the lever abuts against the side of the swing arm structure 21. A larger distance between the first initial position and the swing arm structure 21 compared to the second initial position means a shorter trajectory from the first initial position, resulting in the lever abutting against the swing arm structure 21 earlier.

[0070] In some embodiments of the present invention, reference is made to Figure 8 and Figure 6 The swing arm structure 21 includes a first fitting structure 211; the lever mechanism 3 includes a first side profile structure 31. When the lever mechanism 3 is in the first initial position, the first fitting structure 211 and the first side profile structure 31 fit together.

[0071] In some embodiments of the present invention, reference is made to Figure 8 and Figure 9 The swing arm structure 21 also includes a second fitting structure 212, which is located between the swing center of the first fitting structure 211 and the swing arm structure 21; the lever mechanism 3 includes a second side profile structure 32, which faces away from the first side profile structure 31; when the lever mechanism 3 is in the second initial position, the second fitting structure 212 and the second side profile structure 32 fit together.

[0072] In some specific embodiments, reference is made to Figure 8The first fitting structure 211 is a convex structure, and the second fitting structure 212 is a concave structure. The surface of the swing arm structure 21 near the lever mechanism 3 first convexes outward and then concaves inward during the radial extension of the swing arm structure 21. The lever of the lever structure is a curved structure. When it rotates forward, the lever bends inward to engage with the convex first fitting structure 211 on the swing arm. When it rotates in reverse, it bends outward to engage with the concave second fitting structure 212 on the swing arm.

[0073] In some embodiments of the present invention, reference is made to Figure 4 and Figure 5 The first transmission component 411 is an incomplete gear. An outer limiting protrusion 4112 is provided after the circumferentially arranged teeth of the first transmission component 411. The outer limiting protrusion 4112 is higher than the teeth. A limiting structure 111 is provided on the base 1 facing away from the helmet body 51. The limiting structure 111 is used to abut against the outer limiting protrusion 4112 to limit the rotation of the first transmission component 411.

[0074] In some specific embodiments, reference is made to Figure 4 A boss is provided on the base 1, and a limiting structure 111 extending toward the position of the first transmission member 411 is provided on the side wall of the boss, so that the outer limiting protrusion 4112 on the first transmission member 411 can abut against the limiting structure 111 when rotating.

[0075] In some embodiments of the present invention, the limiting structure 111 is an elastic structure. After the limiting structure 111 is deformed by the outer limiting protrusion 4112, the outer limiting protrusion 4112 passes through, so that the first transmission member 411 continues to rotate.

[0076] In some embodiments of the present invention, reference is made to Figure 4 The base 1 is provided with an annular limiting part 112, which is wrapped around the first fixed shaft 113; the first transmission member 411 is sleeved on the annular limiting part 112; the outer side of the annular limiting part 112 is provided with a stepped structure 1121, which is used to abut against the inner limiting protrusion 4113 on the inner ring of the first transmission member 411.

[0077] In some specific embodiments, reference is made to Figure 4 There are two stepped structures 1121, which abut against the inner limiting protrusion 4113 on the first transmission member 411 when it rotates clockwise and counterclockwise, respectively, to limit the rotation range of the chin support 52.

[0078] In some embodiments of the present invention, the first transmission member 411 is connected to the spring for resetting the chin support 52.

[0079] In some embodiments of the present invention, the first transmission member 411 is used to connect to the chin support 52; the first transmission member 411 is connected to the spring for resetting the chin support 52.

[0080] In some specific embodiments, the spring is directly connected to the rotation shaft of the chin support 52.

[0081] In other embodiments, the structure of the first transmission member 411 can be such that a number of teeth are provided on the outside of the disc-shaped mainspring box to connect the first transmission member 411 to the mainspring, and the first transmission member 411 can form the structure of the gear or pulley part described above.

[0082] In other embodiments, the first transmission component 411 is sleeved on the shaft of the base 1, and the spring box and the first transmission component 411 are connected by means of coaxial arrangement, bushing arrangement, etc., which can be implemented by existing technology known to those skilled in the art, so it will not be described in detail here.

[0083] This invention also provides a helmet that includes the aforementioned linkage device.

[0084] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0085] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0086] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0087] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0088] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0089] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A linkage device for goggles and a chin support, characterized in that, include: The base (1) is used to connect the helmet body (51) and hinge the chin guard (52). The first fixed shaft (113) and the second fixed shaft are disposed on the base (1). The first transmission component (411) and the second transmission component (412) are rotatably mounted on the first fixed shaft (113) and the second fixed shaft, respectively; The first transmission component (411) and the second transmission component (412) can directly mesh or mesh via a synchronous belt; A lever mechanism (3) is used to move the goggles (6) on the helmet. The first transmission component (411) is circumferentially fixedly connected to the rotation axis of the chin support (52), and the lever mechanism (3) is circumferentially fixedly connected to the second transmission component (412), so that when the chin support (52) flips backward or forward, the lever mechanism (3) can synchronously rotate forward or backward to open the goggles (6).

2. The linkage device according to claim 1, characterized in that, It also includes a lens mounting mechanism (2); the lens mounting mechanism (2) is rotatably mounted, and the goggles (6) are mounted on the lens mounting mechanism (2); the lever mechanism (3) abuts against the lens mounting mechanism (2) when it rotates, so that the goggles (6) open.

3. The linkage device according to claim 2, characterized in that, The lens mounting mechanism (2) includes a swing arm structure (21); the lever mechanism (3) has a first initial position and a second initial position when rotating forward and in reverse, respectively, and the distance between the first initial position and the swing arm structure (21) is greater than that between the second initial position and the first initial position.

4. The linkage device according to claim 3, characterized in that, The swing arm structure (21) includes a first fitting structure (211); the lever mechanism (3) includes a first side profile structure (31). When the lever mechanism (3) is in the first initial position, the first fitting structure (211) and the first side profile structure (31) fit together.

5. The linkage device according to claim 4, characterized in that, The swing arm structure (21) further includes a second fitting structure (212), which is located between the swing center of the first fitting structure (211) and the swing arm structure (21); the lever mechanism (3) includes a second side profile structure (32), which faces away from the first side profile structure (31); when the lever mechanism (3) is in the second initial position, the second fitting structure (212) and the second side profile structure (32) fit together.

6. The linkage device according to claim 1, characterized in that, The first transmission component (411) is an incomplete gear. An outer limiting protrusion (4112) is provided after the circumferentially arranged teeth of the first transmission component (411). The outer limiting protrusion (4112) is higher than the teeth. A limiting structure (111) is provided on the base (1) facing away from the helmet body (51). The limiting structure (111) is used to abut against the outer limiting protrusion (4112) to limit the rotation of the first transmission component (411).

7. The linkage device according to claim 6, characterized in that, The limiting structure (111) is an elastic structure. After the limiting structure (111) is deformed by the outer limiting protrusion (4112), the outer limiting protrusion (4112) passes through, causing the first transmission member (411) to continue rotating.

8. The linkage device according to claim 1, characterized in that, The base (1) is provided with an annular limiting part (112), which is wound around the first fixed shaft (113); the first transmission member (411) is sleeved on the annular limiting part (112); the outer side of the annular limiting part (112) is provided with a stepped structure (1121) for abutting against the inner limiting protrusion (4113) on the inner ring of the first transmission member (411).

9. The linkage device according to claim 8, characterized in that, The first transmission element (411) is connected to the spring for resetting the chin support (52).

10. A helmet, characterized in that, Includes the linkage device as described in any one of claims 1 to 9.

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