A collapsible helmet

Abstract

The present invention relates to the technical field of human safety protection devices, and particularly to a foldable helmet. A foldable helmet is provided that can simultaneously fold and unfold a first sub-frame at the front of the helmet and a second sub-frame at the rear for easy carrying and wearing. The present invention provides such a foldable helmet, which includes a frame body, a contraction mechanism, and a folding mechanism. A contraction mechanism is provided on the main frame body, and the contraction mechanism is used to shield and protect the user's face. A folding mechanism is provided between the main frame body and the contraction mechanism. By swinging the first sub-frame downward or upward, and then through the transmission between the rotating member, the first spur gear, the opposed gear, and the second spur gear, the second sub-frame can also be swung downward or upward, so that the first sub-frame and the second sub-frame can be simultaneously unfolded or folded, facilitating wearing and carrying.

Description

Technical Field

[0001] The present invention relates to the technical field of human safety protection devices, and in particular to a foldable helmet. Background Art

[0002] There are more and more vehicles on the road, and now traffic accidents occur frequently. For people riding electric vehicles, motorcycles, and even bicycles, they must wear helmets, otherwise they cannot drive on the road. There are a very large number of helmet styles on the market now.

[0003] The patent with the patent publication number CN208048128U discloses a split helmet, which includes a main helmet part and a helmet branch part opposite to the user's mouth and jaw positions. A fixing device and a wire quick-connection device for quickly assembling and disassembling the helmet are provided at the connection between the main helmet part and the helmet branch part. The main helmet part is equipped with electrical components and a controller, the inner cavity of the helmet branch part is equipped with a power supply, the electrical components are all electrically connected to the controller, and the power supply is electrically connected to the controller through the wire quick-connection device.

[0004] The above-mentioned split helmet can be disassembled. When wearing it, install the helmet branch part and then wear it. When not in use, disassemble the helmet branch part. However, the rear part of the helmet is fixed and cannot be disassembled or folded. In this way, when placing the helmet branch part and the main helmet part separately, it is very inconvenient for the user to carry, and it is easy to lose the helmet parts. It is also extremely troublesome to wear. Now, a foldable helmet is developed that can simultaneously fold and unfold the first sub-frame in the front part and the second sub-frame in the rear part of the helmet for easy carrying and wearing. Summary of the Invention

[0005] In order to overcome the disadvantages of the existing split helmet being inconvenient to carry and the split type being prone to loss of parts, the technical problem is to provide a foldable helmet that can simultaneously fold and unfold the first sub-frame in the front part and the second sub-frame in the rear part of the helmet for easy carrying and wearing.

[0006] The technical solution is as follows: A foldable helmet includes a main frame body, a contraction mechanism, and a folding mechanism. The contraction mechanism is provided on the main frame body to shield and protect the user's face using the contraction mechanism. A folding mechanism is provided between the main frame body and the contraction mechanism. When driving the contraction mechanism to unfold, the folding mechanism is automatically rotated and unfolded to protect the user's back of the head.

[0007] Further, the contraction mechanism includes a first sub-frame, a fixing frame, a rotating member, and a first hairspring. Fixing frames are connected to the left and right sides of the lower part of the main frame by bolts, and rotating members are rotatably connected to the fixing frames through damping sleeves. A first sub-frame is connected between the rotating members and is used to protect the user's face. First hairsprings are connected between the mutually remote sides of the rotating members and the fixing frames, and the first hairsprings are wound around the rotating members.

[0008] Further, the folding mechanism includes a second sub-frame, fixing rods, opposed gears, a first spur gear, and a second spur gear. The second sub-frame is rotatably connected to the lower rear part of the main frame and protects the user's back of the head. The left and right sides of the second sub-frame pass through the main frame respectively. Second spur gears are connected to the left and right sides of the second sub-frame. First spur gears are connected to the mutually close sides of the rotating members and are located between the inner sides of the first sub-frame. Two fixing rods are connected to the left and right sides of the lower part of the main frame respectively, and the adjacent two fixing rods are arranged front and rear. The fixing rods are located below the rotating members, and opposed gears are connected to the fixing rods. The front opposed gear meshes with the second spur gear, and the rear opposed gear meshes with the first spur gear. Pushing the first sub-frame downward will drive the first spur gear to rotate through the rotating member, and under the cooperation of the opposed gear and the second spur gear, the second sub-frame will swing downward synchronously.

[0009] Further, an unlocking mechanism for unlocking the rotating member by pressing is further included. The unlocking mechanism includes a gland, a ratchet wheel, a limiting member, a first linear spring, a limiting block, and a torsion spring. Glands are rotatably connected to the mutually remote sides of the fixing frames, and first linear springs are evenly connected between the glands and the adjacent fixing frames. Ratchet wheels are connected to the mutually remote sides of the rotating members. The left ratchet wheel is located at the left part of the left fixing frame, and the right ratchet wheel is located at the right part of the right fixing frame. Limiting blocks are rotatably connected to the rear parts of the fixing frames, and the limiting blocks hold the ratchet wheels, resulting in that the rotating members can only rotate counterclockwise and cannot rotate clockwise. Torsion springs are connected between the mutually close sides of the limiting blocks and the fixing frames. Limiting members are welded to the mutually close sides of the glands and are located below the limiting blocks. The limiting members limit the lower parts of the limiting blocks. During the process of swinging the first sub-frame downward for adjustment, the rotating members are driven to rotate counterclockwise, and the ratchet wheels rotate counterclockwise. Pressing the glands toward the mutually close sides drives the limiting members to release the limiting blocks toward the mutually close sides, and the limiting blocks cannot lock the ratchet wheels.

[0010] Further, a protection mechanism for protecting the user's back of the head is further included. The protection mechanism includes a support plate, a sliding sleeve, a telescopic rod, and a second linear spring. Sliding sleeves are evenly connected to the front side of the lower part of the second sub-frame, telescopic rods are slidably connected to the sliding sleeves, second linear springs are connected between the telescopic rods and the sliding sleeves, and a support plate is connected between the front parts of the telescopic rods and is used to support the user's back of the head.

[0011] Further, it further includes an adjusting mechanism for adjusting the distance between the support plate and the back of the user's head. The adjusting mechanism includes an arc-shaped wedge. Slide grooves are opened on both the left and right sides of the inner top wall of the main frame body. The arc-shaped wedges are slidably connected to the slide grooves. When the arc-shaped wedges slide downward, they push the support plate forward and move the support plate closer to the back of the user's head.

[0012] Further, it further includes a winding and binding mechanism for fixing the main frame body at the position of the user's chin by winding and binding. The winding and binding mechanism includes a fixed frame, a second spring, a winding drum, and a protective belt. Fixed frames are connected to both the left and right sides of the bottom of the main frame body. Winding drums are rotatably connected to the fixed frames. A protective belt is wound between the winding drums. The protective belt is passed around the position of the user's chin to fix the main frame body. The lower part of the protective belt passes through the fixed frame. Second springs are connected between the front parts of the winding drums and the fixed frames.

[0013] Further, it further includes a rubber pad. The rubber pad is connected to the lower part of the protective belt.

[0014] The beneficial effects are as follows: 1. By swinging the first sub-frame downward or upward, and then through the transmission between the rotating member, the first spur gear, the opposed gear, and the second spur gear, the second sub-frame can also swing downward or upward. In this way, the first sub-frame and the second sub-frame can be unfolded or folded simultaneously, which is convenient for wearing and carrying.

[0015] 2. The position of the ratchet is locked by the limit block, thereby automatically locking the positions of the first sub-frame and the second sub-frame. When it is necessary to unlock the first sub-frame and the second sub-frame, the pressing cover can be pressed to release the ratchet, so that the first sub-frame and the second sub-frame can be folded up. In this way, it is convenient to lock the first sub-frame and the second sub-frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0017] Figure 2 It is a partial three-dimensional structural schematic diagram of the present invention.

[0018] Figure 3 It is a first partial three-dimensional structural schematic diagram of the contraction mechanism of the present invention.

[0019] Figure 4 It is an enlarged three-dimensional structural schematic diagram of part A of the present invention.

[0020] Figure 5 It is a second partial three-dimensional structural schematic diagram of the contraction mechanism of the present invention.

[0021] Figure 6 It is a three-dimensional structural schematic diagram of the folding mechanism of the present invention.

[0022] Figure 7 This is a schematic perspective view of the enlarged structure at position B of the present invention.

[0023] Figure 8 This is an exploded view of the main frame and the second auxiliary frame of the present invention.

[0024] Figure 9 This is a schematic perspective view of the first partial structure of the unlocking mechanism of the present invention.

[0025] Figure 10 This is a schematic perspective view of the second partial structure of the unlocking mechanism of the present invention.

[0026] Figure 11 This is a schematic perspective view of the first partial structure of the protection mechanism of the present invention.

[0027] Figure 12 This is a schematic perspective view of the enlarged structure at position C of the present invention.

[0028] Figure 13 This is a schematic perspective view of the second partial structure of the protection mechanism of the present invention.

[0029] Figure 14 This is a schematic perspective view of the first partial structure of the adjustment mechanism of the present invention.

[0030] Figure 15 This is a schematic perspective view of the second partial structure of the adjustment mechanism of the present invention.

[0031] Figure 16 This is a schematic perspective view of the winding and binding mechanism of the present invention.

[0032] Figure 17 This is a schematic perspective view of the enlarged structure at position D of the present invention.

[0033] Names and serial numbers of components in the figure: 1 - main frame, 2 - contraction mechanism, 21 - first auxiliary frame, 22 - fixing frame, 23 - rotating part, 24 - first winding spring, 3 - folding mechanism, 31 - second auxiliary frame, 32 - fixing rod, 33 - opposed gears, 34 - first spur gear, 35 - second spur gear, 4 - unlocking mechanism, 41 - gland, 42 - ratchet wheel, 43 - limiting part, 44 - first linear spring, 45 - limiting block, 46 - torsion spring, 5 - protection mechanism, 51 - support plate, 52 - sliding sleeve, 53 - telescopic rod, 54 - second linear spring, 6 - adjustment mechanism, 61 - sliding groove, 62 - arc-shaped wedge, 7 - winding and binding mechanism, 71 - fixing frame, 72 - second winding spring, 73 - winding drum, 74 - protective belt, 75 - rubber pad. Detailed implementation manners

[0034] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

[0035] Embodiment 1

[0036] A foldable helmet, as Figure 1 - Figure 2 shown, includes a main frame 1, a contraction mechanism 2 and a folding mechanism 3. A contraction mechanism 2 is provided on the main frame 1, and a folding mechanism 3 is provided between the main frame 1 and the contraction mechanism 2; as Figure 1 - Figure 5 shown, the contraction mechanism 2 includes a first sub-frame 21, a fixing frame 22, a rotating member 23 and a first spring 24. Fixing frames 22 are connected to the left and right sides of the lower part of the main frame 1 by bolts, and rotating members 23 are rotatably connected to the fixing frames 22 through damping sleeves. A first sub-frame 21 is connected between the rotating members 23. First springs 24 are connected between the mutually remote sides of the rotating members 23 and the fixing frames 22, and the first springs 24 are wound around the rotating members 23; as Figure 1 、 Figure 2 、 Figure 6 、 Figure 7 and Figure 8 shown, the folding mechanism 3 includes a second sub-frame 31, fixing rods 32, opposed gears 33, a first spur gear 34 and a second spur gear 35. A second sub-frame 31 is rotatably connected to the lower rear part of the main frame 1. The left and right sides of the second sub-frame 31 pass through the main frame 1 respectively. Second spur gears 35 are connected to the left and right sides of the second sub-frame 31. First spur gears 34 are connected to the mutually close sides of the rotating members 23. The first spur gears 34 are located between the inner sides of the first sub-frame 21. Two fixing rods 32 are connected to the left and right sides of the lower part of the main frame 1 respectively. The adjacent two fixing rods 32 are arranged front and rear. The fixing rods 32 are located below the rotating members 23. Opposed gears 33 are connected to the fixing rods 32. The front opposed gears 33 are engaged with the second spur gears 35, and the rear opposed gears 33 are engaged with the first spur gears 34.

[0037] When wearing the helmet, put the main frame body 1 on the user's head, and then swing the first sub-frame body 21 downward so that the first sub-frame body 21 protects the user's face. The first sub-frame body 21 drives the rotating member 23 to rotate counterclockwise, the first spring 24 is twisted, the rotating member 23 rotates to drive the first straight gear 34 to rotate counterclockwise, the first straight gear 34 rotates counterclockwise to drive the rear opposed gear 33 to rotate clockwise, the rear opposed gear 33 rotates clockwise to drive the front opposed gear 33 to rotate counterclockwise, the front opposed gear 33 rotates counterclockwise to drive the second straight gear 35 to rotate clockwise, the second straight gear 35 rotates clockwise to drive the second sub-frame body 31 to rotate clockwise, and the second sub-frame body 31 will swing downward to the back of the user's head. Since there is a damping sleeve between the fixing frame 22 and the rotating member 23, the position of the rotating member 23 can be blocked to prevent the rotating member 23 from reversing and resetting. In this way, it can be realized that while the first sub-frame body 21 swings downward, the second sub-frame body 31 is automatically swung downward at the same time, protecting the user's face and the back of the head at the same time. When not in use, the first sub-frame body 21 can be rotated to drive the rotating member 23 to rotate clockwise and reset, and then drive the second sub-frame body 31 to swing upward and fold. The first spring 24 is reset. Under the action of the first spring 24, it is convenient to drive the rotating member 23 to reset and the second sub-frame body 31 to reset and fold, so that it is convenient for the user to carry and wear the helmet.

[0038] Embodiment 2

[0039] On the basis of Embodiment 1, as Figure 1 、 Figure 2 、 Figure 9 and Figure 10 shown, it further includes an unlocking mechanism 4 for unlocking the rotating member 23 by pressing. The unlocking mechanism 4 includes a gland 41, a ratchet 42, a limiting member 43, a first linear spring 44, a limiting block 45 and a torsion spring 46. The gland 41 is rotatably connected to one side of the fixing frame 22 away from each other. The gland 41 and the adjacent fixing frame 22 are evenly connected with a first linear spring 44. There are three first linear springs 44. The ratchet 42 is connected to one side of the rotating member 23 away from each other. The left ratchet 42 is located at the left part of the left fixing frame 22, and the right ratchet 42 is located at the right part of the right fixing frame 22. The limiting block 45 is rotatably connected to the rear part of the fixing frame 22. The limiting block 45 blocks the ratchet 42. A torsion spring 46 is connected between the side of the limiting block 45 close to each other and the fixing frame 22. The limiting member 43 is welded to the side of the gland 41 close to each other. The limiting member 43 is located below the limiting block 45. The limiting member 43 limits the lower part of the limiting block 45.

[0040] During the downward swing adjustment of the first sub-frame 21, the rotating member 23 is driven to rotate counterclockwise, and the rotating member 23 drives the ratchet 42 to rotate counterclockwise. The ratchet 42 rotates counterclockwise and continuously squeezes and toggles the limit block 45, so that the limit block 45 rotates continuously clockwise, and the torsion spring 46 drives the limit block 45 to rotate and reset continuously. Since the limit member 43 presses the lower part of the limit block 45, the limit block 45 cannot rotate counterclockwise, thereby preventing the first sub-frame 21 from reversing and resetting. In this way, the positions of the first sub-frame 21 and the second sub-frame 31 can be automatically locked. When the first sub-frame 21 and the second sub-frame 31 are placed, the pressure cover 41 can be pressed toward the side close to each other, the first linear spring 44 is compressed, driving the limiting member 43 to release the limiting block 45 toward the side close to each other, and then the ratchet 42 can be reversed counterclockwise and reset, and at the same time the limiting block 45 cannot lock the ratchet 42, so that the first sub-frame 21 and the second sub-frame 31 are rotated, folded and retracted, and then the pressure cover 41 is released, and under the action of the first linear spring 44, the pressure cover 41 and the limiting member 43 are driven to move and reset, and the limiting member 43 locks the limiting block 45 again.

[0041] like Figure 1 , Figure 2 , Figure 11 , Figure 12 and Figure 13 As shown, it also includes a protection mechanism 5 for protecting the back of the user's head. The protection mechanism 5 includes a support plate 51, a sliding sleeve 52, a telescopic rod 53 and a second linear spring 54. The front side of the lower part of the second sub-frame 31 is evenly connected with the sliding sleeves 52. There are six sliding sleeves 52. The sliding sleeves 52 are all slidably connected with the telescopic rods 53. The second linear spring 54 is connected between the telescopic rods 53 and the sliding sleeves 52. The support plate 51 is connected between the front parts of the telescopic rods 53.

[0042] When the helmet is worn, the support plate 51 fits against the back of the user's head, and under the action of the second linear spring 54 , the support plate 51 can protect the back of the user's head.

[0043] like Figure 2 , Figure 14 and Figure 15 As shown, it also includes an adjustment mechanism 6 for adjusting the distance between the support plate 51 and the back of the user's head. The adjustment mechanism 6 includes an arc-shaped wedge-shaped piece 62. Slide grooves 61 are opened on the left and right sides of the top wall of the main frame 1, and the slide grooves 61 are slidably connected to the arc-shaped wedge-shaped pieces 62.

[0044] When the user uses the helmet, if the back of the user's head is relatively small and the supporting plate 51 cannot fit with the back of the head, the arc-shaped wedge 62 can be slid downward along the chute 61. When the arc-shaped wedge 62 contacts the supporting plate 51, it will drive the supporting plate 51 to move forward, so that the supporting plate 51 fits with the back of the user's head, and the telescopic rod 53 also moves forward, and the second linear spring 54 is stretched. In this way, the distance between the supporting plate 51 and the back of the user's head can be adjusted according to the size of the back of the user's head. When not in use, the arc-shaped wedge 62 can be slid upward to reset. When the arc-shaped wedge 62 is separated from the supporting plate 51, under the action of the second linear spring 54, the telescopic rod 53 and the supporting plate 51 are driven to move backward to reset.

[0045] As Figure 1 , Figure 2 , Figure 16 and Figure 17 shown, it further includes a winding and binding mechanism 7 for fixing the main frame 1 at the user's chin position by winding and binding. The winding and binding mechanism 7 includes a fixed frame 71, a second winding spring 72, a winding drum 73 and a protective belt 74. Fixed frames 71 are connected to both the left and right sides of the bottom of the main frame 1. Winding drums 73 are rotatably connected in the fixed frames 71 respectively. A protective belt 74 is wound between the winding drums 73. The lower part of the protective belt 74 passes out of the fixed frame 71. Second winding springs 72 are connected between the front parts of the winding drums 73 and the fixed frames 71 respectively.

[0046] As Figure 16 shown, it further includes a rubber pad 75. A rubber pad 75 is connected to the lower part of the protective belt 74.

[0047] When using the helmet, pull out the protective belt 74, the winding drum 73 rotates accordingly, and the second winding spring 72 is twisted. Then buckle the rubber pad 75 at the user's chin position. The rubber pad 75 can make the user's chin more comfortable. Then let go. Under the action of the second winding spring 72, the winding drum 73 is driven to reverse and reset to wind up the protective belt 74. In this way, the helmet can be fixed well.

[0048] The above are only the embodiments of the present invention, and thus do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A foldable helmet, comprising a main frame body (1), and the main frame body (1) is used to protect the head, characterized in that, It further includes a contraction mechanism (2) and a folding mechanism (3). The contraction mechanism (2) is provided on the main frame body (1). The contraction mechanism (2) is used to shield and protect the user's face. A folding mechanism (3) is provided between the main frame body (1) and the contraction mechanism (2). When the contraction mechanism (2) is driven to unfold, the folding mechanism (3) is automatically rotated and unfolded to protect the user's back of the head. The contraction mechanism (2) includes a first auxiliary frame body (21), a fixing frame (22), a rotating member (23) and a first hairspring (24). Fixing frames (22) are bolted to the left and right sides of the lower part of the main frame body (1). Rotating members (23) are rotatably connected to the fixing frames (22) through damping sleeves. A first auxiliary frame body (21) is connected between the rotating members (23). The first auxiliary frame body (21) is used to protect the user's face. First hairsprings (24) are connected between the mutually remote sides of the rotating members (23) and the fixing frames (22). The first hairsprings (24) are wound around the rotating members (23). It further includes an unlocking mechanism (4) for unlocking the rotating member (23) by pressing. The unlocking mechanism (4) includes a gland (41), a ratchet wheel (42), a limiting member (43), a first linear spring (44), a limiting block (45) and a torsion spring (46). Glands (41) are rotatably connected to the mutually remote sides of the fixing frames (22). First linear springs (44) are evenly connected between the glands (41) and the adjacent fixing frames (22). Ratchet wheels (42) are connected to the mutually remote sides of the rotating members (23). The left ratchet wheel (42) is located at the left part of the left fixing frame (22), and the right ratchet wheel (42) is located at the right part of the right fixing frame (22). Limiting blocks (45) are rotatably connected to the rear parts of the fixing frames (22). The limiting blocks (45) lock the ratchet wheels (42), causing the rotating members (23) to only rotate counterclockwise and unable to rotate clockwise. Torsion springs (46) are connected between the mutually close sides of the limiting blocks (45) and the fixing frames (22). Limiting members (43) are welded to the mutually close sides of the glands (41). The limiting members (43) are located below the limiting blocks (45). The limiting members (43) limit the lower parts of the limiting blocks (45). During the process of swinging the first auxiliary frame body (21) downward for adjustment, the rotating members (23) are driven to rotate counterclockwise, and the ratchet wheels (42) rotate counterclockwise. The glands (41) are pressed toward the mutually close sides, driving the limiting members (43) to release the limiting blocks (45) toward the mutually close sides, and the limiting blocks (45) can no longer lock the ratchet wheels (42).

2. The foldable helmet according to claim 1, characterized in that, The folding mechanism (3) includes a second auxiliary frame body (31), a fixed rod (32), an opposed gear (33), a first spur gear (34) and a second spur gear (35). The second auxiliary frame body (31) is rotatably connected to the lower rear part of the main frame body (1). The second auxiliary frame body (31) protects the back of the user's head. The left and right sides of the second auxiliary frame body (31) respectively pass through the main frame body (1). Second spur gears (35) are connected to both the left and right sides of the second auxiliary frame body (31). First spur gears (34) are connected to the mutually approaching sides of the rotating members (23). The first spur gears (34) are located between the inner sides of the first auxiliary frame body (21). Two fixed rods (32) are connected to both the left and right sides of the lower part of the main frame body (1). The adjacent two fixed rods (32) are arranged front and rear. The fixed rods (32) are located below the rotating members (23). Opposed gears (33) are connected to the fixed rods (32). The front opposed gear (33) meshes with the second spur gear (35), and the rear opposed gear (33) meshes with the first spur gear (34). Pushing the first auxiliary frame body (21) downward will drive the first spur gear (34) to rotate through the rotating member (23). Under the cooperation between the opposed gear (33) and the second spur gear (35), the second auxiliary frame body (31) will swing downward synchronously.

3. The foldable helmet according to claim 2, wherein, It further includes a protection mechanism (5) for protecting the back of the user's head. The protection mechanism (5) includes a support plate (51), a sliding sleeve (52), a telescopic rod (53) and a second linear spring (54). Sliding sleeves (52) are evenly connected to the front lower side of the second auxiliary frame body (31). Telescopic rods (53) are slidably connected to the sliding sleeves (52). Second linear springs (54) are connected between the telescopic rods (53) and the sliding sleeves (52). A support plate (51) is connected between the front parts of the telescopic rods (53). The support plate (51) is used to support the back of the user's head.

4. The foldable helmet according to claim 3, wherein, It further includes an adjustment mechanism (6) for adjusting the distance between the support plate (51) and the back of the user's head. The adjustment mechanism (6) includes an arc-shaped wedge member (62). Chutes (61) are opened on both the left and right sides of the inner top wall of the main frame body (1). Arc-shaped wedge members (62) are slidably connected to the chutes (61). When the arc-shaped wedge members (62) slide downward, they will push the support plate (51) forward and make the support plate (51) approach the back of the user's head.

5. The foldable helmet according to claim 4, wherein, It further includes a winding and binding mechanism (7) for fixing the main frame body (1) at the position of the user's chin by winding and binding. The winding and binding mechanism (7) includes a fixed frame (71), a second clockwork spring (72), a winding drum (73) and a protective belt (74). Fixed frames (71) are connected to both the left and right sides of the bottom of the main frame body (1). Winding drums (73) are rotatably connected to the fixed frames (71). A protective belt (74) is wound around between the winding drums (73). The protective belt (74) is passed around the position of the user's chin to fix the main frame body (1). The lower part of the protective belt (74) passes out of the fixed frame (71). Second clockwork springs (72) are connected between the front parts of the winding drums (73) and the fixed frames (71).

6. The foldable helmet according to claim 5, wherein, It further includes a rubber pad (75), and the rubber pad (75) is connected to the lower part of the protective belt (74).

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