CN116035320B

CN116035320B - Foldable helmet

Info

Publication number: CN116035320B
Application number: CN202211444976.9A
Authority: CN
Inventors: 曾长龙
Original assignee: Ganzhou Yilian Technology Co ltd
Current assignee: Ganzhou Yilian Technology Co ltd
Priority date: 2022-11-18
Filing date: 2022-11-18
Publication date: 2025-06-27
Anticipated expiration: 2042-11-18
Also published as: CN116035320A

Abstract

The invention relates to the technical field of human body safety protection appliances, in particular to a foldable helmet. A collapsible helmet is provided that enables a first subframe at the front and a second subframe at the rear of the helmet to be folded and unfolded simultaneously for portability and wearing. The invention provides a foldable helmet which comprises a frame body, a contraction mechanism and a folding mechanism, wherein the contraction mechanism is arranged on a main frame body, the contraction mechanism is used for shielding the face of a user, and the folding mechanism is arranged between the main frame body and the contraction mechanism. According to the invention, the first auxiliary frame body swings downwards or upwards, and then the second auxiliary frame body swings downwards or upwards through the transmission among the rotating piece, the first straight gear, the opposite gear and the second straight gear, so that the first auxiliary frame body and the second auxiliary frame body can be unfolded or folded at the same time, and the portable electronic device is convenient to wear and carry.

Description

Foldable helmet

Technical Field

The invention relates to the technical field of human body safety protection appliances, in particular to a foldable helmet.

Background

More and more vehicles come and go on the road, traffic accidents are frequent at present, and people riding electric vehicles, motorcycles and even bicycles must wear helmets, or cannot travel on the road, so that the helmets on the market are quite various in style.

Patent publication number CN208048128U discloses a split type helmet, including helmet main part, with the relative helmet subsection of user's mouth and chin position, the junction of helmet main part and helmet subsection is equipped with the fixing device and the electric wire quick-connect device that are used for the quick-operation helmet of installing and removing, the helmet main part is equipped with power consumption part, controller, the helmet subsection inner chamber is equipped with the power, power consumption part all with controller electric connection, the power passes through electric wire quick-connect device and controller electric connection.

The split type helmet can be disassembled and assembled, when the split type helmet is worn, the helmet is assembled and then disassembled when the split type helmet is not used, but the helmet is fixed at the rear part, the helmet is not disassembled or folded at the rear part, so that the helmet is assembled and disassembled with the helmet main part, the split type helmet is very inconvenient for a user to carry, helmet parts are easy to lose, the split type helmet is extremely troublesome to wear, and the split type helmet is developed at present, so that the first auxiliary frame body at the front part of the helmet and the second auxiliary frame body at the rear part of the helmet can be folded and unfolded simultaneously, and the split type helmet is portable and can be worn.

Disclosure of Invention

In order to overcome the defects that the existing split type helmet is inconvenient to carry and parts are easy to lose due to split, the technical problem is that the foldable helmet can be carried and worn by folding and unfolding a first auxiliary frame body at the front part and a second auxiliary frame body at the rear part of the helmet simultaneously.

The technical scheme is that the foldable helmet comprises a main frame body, a contraction mechanism and a folding mechanism, wherein the contraction mechanism is arranged on the main frame body, the face of a user is shielded and protected by the contraction mechanism, the folding mechanism is arranged between the main frame body and the contraction mechanism, and when the contraction mechanism is driven to be unfolded, the folding mechanism is automatically rotated and unfolded to protect a back brain spoon of the user.

Further, the contraction mechanism comprises a first auxiliary frame body, a fixing frame, rotating parts and first spring, wherein the left side and the right side of the lower portion of the main frame body are connected with the fixing frame through bolts, the fixing frame is connected with the rotating parts through damping sleeves in a rotating mode, the first auxiliary frame body is connected between the rotating parts and used for protecting the face of a user, the first spring is connected between one side, away from each other, of the rotating parts and the fixing frame, and the first spring is wound on the rotating parts.

Further, folding mechanism is including second auxiliary frame body, the dead lever, the counter gear, first straight gear and second straight gear, the lower part rotates behind the main frame body and is connected with the second auxiliary frame body, the second auxiliary frame body protects the user's back brain spoon, the main frame body is passed respectively to second auxiliary frame body left and right sides, second auxiliary frame body left and right sides all is connected with the second straight gear, one side that rotates the piece and be close to each other all is connected with first straight gear, first straight gear is located between the first auxiliary frame body inboard, main frame body lower part left and right sides all is connected with two dead levers, two adjacent dead levers are the setting around, the dead lever is located the rotating member below, all be connected with the counter gear on the dead lever, the counter gear of front portion and second straight gear meshing, the counter gear and the first straight gear meshing of rear portion, dial down first auxiliary frame body can drive first straight gear through the rotating member and under the cooperation between counter gear and second straight gear, with the synchronous downward swing of second auxiliary frame body.

Further, the unlocking mechanism for unlocking the rotating piece in a pressing mode is further arranged, the unlocking mechanism comprises a gland, a ratchet wheel, a limiting piece, a first linear spring, a limiting block and a torsion spring, the gland is connected to one side, away from each other, of the fixing frame in a rotating mode, the first linear spring is evenly connected between the gland and the adjacent fixing frame, one side, away from each other, of the rotating piece is connected with the ratchet wheel, the ratchet wheel on the left side is located the left part of the fixing frame, the ratchet wheel on the right side is located the right part of the fixing frame, the limiting block is connected with the limiting block in a rotating mode, the ratchet wheel is clamped, the rotating piece can only rotate anticlockwise and cannot rotate clockwise, a torsion spring is connected between one side, close to each other, of the limiting block and the fixing frame, the limiting piece is located the lower portion of the limiting block, the limiting block is limited, the rotating piece is driven to rotate anticlockwise in the downward swing adjusting process of the first auxiliary frame, the ratchet wheel is rotated anticlockwise, the ratchet wheel is pressed towards one side, the limiting block is driven to one side, and the limiting block cannot be locked.

Further, the device also comprises a protection mechanism for protecting the user's hindbrain spoon, the protection mechanism comprises a supporting plate, a sliding sleeve, a telescopic rod and a second linear spring, the front side of the lower part of the second auxiliary frame body is uniformly connected with the sliding sleeve, the sliding sleeve is uniformly connected with the telescopic rod in a sliding manner, the second linear spring is uniformly connected between the telescopic rod and the sliding sleeve, the supporting plate is connected between the front part of the telescopic rod, and the supporting plate is used for supporting the user's hindbrain spoon.

Further, the device also comprises an adjusting mechanism for adjusting the distance between the support plate and the back brain of the user, the adjusting mechanism comprises an arc-shaped wedge-shaped piece, the left side and the right side of the top wall in the main frame body are respectively provided with a sliding groove, the sliding grooves are respectively connected with the arc-shaped wedge-shaped piece in a sliding manner, the arc-shaped wedge-shaped piece slides downwards to push the support plate forwards, and the support plate is close to the back brain of the user.

Further, still including the rolling constraint mechanism that is fixed the main framework in user's chin position through the mode of rolling constraint, rolling constraint mechanism is including fixed frame, second clockwork spring, receipts reel and protection belt, and main framework bottom left and right sides all is connected with fixed frame, all is connected with receipts reel in the fixed frame, winds the receipts reel between the receipts reel and has the protection belt, walks around user's chin position with the protection belt to fixed main framework, fixed frame is worn out to the protection belt lower part, all is connected with the second clockwork spring between receipts reel front portion and the fixed frame.

Further, the utility model also comprises a rubber pad, and the lower part of the protective belt is connected with the rubber pad.

The portable folding type portable folding device has the beneficial effects that 1, the first auxiliary frame body swings downwards or upwards, and then the second auxiliary frame body swings downwards or upwards through the transmission among the rotating piece, the first straight gear, the opposite gear and the second straight gear, so that the first auxiliary frame body and the second auxiliary frame body can be unfolded or folded at the same time, and the portable folding type portable folding device is convenient to wear.

2. According to the invention, the positions of the ratchet wheels are locked through the limiting block, so that the positions of the first auxiliary frame body and the second auxiliary frame body are automatically locked, and if the first auxiliary frame body and the second auxiliary frame body are required to be unlocked, the pressing cover can be pressed, so that the ratchet wheels are released, and the first auxiliary frame body and the second auxiliary frame body are folded and retracted, so that the first auxiliary frame body and the second auxiliary frame body can be conveniently locked.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic view of a partial perspective structure of the present invention.

Fig. 3 is a schematic perspective view of a first part of the retracting mechanism of the present invention.

Fig. 4 is an enlarged perspective view of the present invention at a.

Fig. 5 is a schematic perspective view of a second part of the retracting mechanism of the present invention.

Fig. 6 is a schematic perspective view of a folding mechanism according to the present invention.

Fig. 7 is an enlarged perspective view of the structure of the present invention at B.

Fig. 8 is an exploded view of the main housing and the second sub-housing of the present invention.

Fig. 9 is a schematic perspective view of a first part of an unlocking mechanism according to the present invention.

Fig. 10 is a schematic perspective view of a second part of the unlocking mechanism of the present invention.

Fig. 11 is a schematic perspective view of a first part of the protection mechanism of the present invention.

Fig. 12 is an enlarged perspective view of the present invention at C.

Fig. 13 is a schematic perspective view of a second part of the protection mechanism of the present invention.

Fig. 14 is a schematic perspective view of a first part of the adjusting mechanism of the present invention.

Fig. 15 is a schematic perspective view of a second portion of the adjustment mechanism of the present invention.

Fig. 16 is a schematic perspective view of a winding and binding mechanism according to the present invention.

Fig. 17 is an enlarged perspective view of the present invention at D.

In the figure, the names and serial numbers of the parts are 1-main frame body, 2-shrinkage mechanism, 21-first auxiliary frame body, 22-fixing frame, 23-rotating piece, 24-first spring, 3-folding mechanism, 31-second auxiliary frame body, 32-fixing rod, 33-opposite gear, 34-first straight gear, 35-second straight gear, 4-unlocking mechanism, 41-gland, 42-ratchet wheel, 43-limiting piece, 44-first straight spring, 45-limiting piece, 46-torsion spring, 5-protection mechanism, 51-supporting plate, 52-sliding sleeve, 53-telescopic rod, 54-second straight spring, 6-adjusting mechanism, 61-sliding groove, 62-arc-shaped wedge piece, 7-winding constraint mechanism, 71-fixing frame, 72-second spring, 73-winding drum, 74-protecting belt and 75-rubber pad.

Detailed Description

The invention is described in detail below with reference to the drawings and the specific embodiments.

Example 1

1-2, The foldable helmet comprises a main frame body 1, a contraction mechanism 2 and a folding mechanism 3, wherein the contraction mechanism 2 is arranged on the main frame body 1, and the folding mechanism 3 is arranged between the main frame body 1 and the contraction mechanism 2; as shown in fig. 1-5, the contraction mechanism 2 comprises a first auxiliary frame 21, a fixing frame 22, a rotating piece 23 and a first transmitting strip 24, wherein the left side and the right side of the lower part of the main frame 1 are respectively connected with the fixing frame 22 through bolts, the rotating piece 23 is respectively connected with the rotating piece 23 through damping sleeves, the first auxiliary frame 21 is connected between the rotating pieces 23, one side, far away from each other, of the rotating piece 23 is respectively connected with the first transmitting strip 24 between the fixing frame 22, the first transmitting strip 24 is wound on the rotating piece 23, as shown in fig. 1,2, 6, 7 and 8, the contraction mechanism 3 comprises a first auxiliary frame 31, a fixed rod 32, a counter gear 33, a first straight gear 34 and a second straight gear 35, the lower part of the main frame 1 is rotatably connected with the second auxiliary frame 31, the left side and the right side of the second auxiliary frame 31 are respectively penetrated through the main frame 1, the left side and the right side of the second auxiliary frame 31 are respectively connected with the second straight gear 35, one side, near to each other sides of the rotating piece 23 are respectively connected with the first straight gear 34, the first straight gear 34 is positioned on the inner side of the first auxiliary frame 21, the right side of the first straight gear 33 is positioned on the right side of the opposite side, the right side of the opposite gear 33 is meshed with the right side of the opposite gear 33, the opposite gear 33 is fixedly positioned on the right side of the opposite gear 33, and the opposite gear 33 is meshed with the opposite gear 33, and the opposite side of the opposite gear 33 is fixedly positioned on the right side of the right side gear 33, and the opposite gear 33, and the front side is positioned on the opposite side and the front side gear 33 and the opposite side is fixed gear 33 and the opposite side and the front side gear 33 is respectively.

When the helmet is worn, the main frame 1 is sleeved on the head of a user, then the first auxiliary frame 21 swings downwards, so that the first auxiliary frame 21 protects the face of the user, the first auxiliary frame 21 drives the rotating piece 23 to rotate anticlockwise, the first hair strip 24 is twisted, the rotating piece 23 rotates to drive the first straight gear 34 to rotate anticlockwise, the first straight gear 34 rotates to drive the rear counter gear 33 to rotate clockwise, the rear counter gear 33 rotates clockwise to drive the front counter gear 33 to rotate anticlockwise, the front counter gear 33 rotates anticlockwise to drive the second straight gear 35 to rotate clockwise, the second straight gear 35 rotates clockwise to drive the second auxiliary frame 31 to rotate clockwise, the second auxiliary frame body 31 can swing downwards to the hindbrain scoop of the user, and the damping sleeve is arranged between the fixing frame 22 and the rotating piece 23, so that the position of the rotating piece 23 can be clamped, the rotating piece 23 is prevented from reversely rotating and resetting, the first auxiliary frame body 21 can swing downwards and simultaneously the second auxiliary frame body 31 can swing downwards automatically, the face and the hindbrain scoop of the user are protected, when the helmet is not used, the first auxiliary frame body 21 can be rotated, the rotating piece 23 is driven to rotate and reset clockwise, the second auxiliary frame body 31 is driven to swing upwards and reset and fold, the first hair strip 24 is reset, the rotating piece 23 is driven to reset and the second auxiliary frame body 31 is driven to reset and fold conveniently under the action of the first spring 24, and the helmet is convenient to carry and wear by the user.

Example 2

On the basis of embodiment 1, as shown in fig. 1, fig. 2, fig. 9 and fig. 10, the unlocking mechanism 4 for unlocking the rotating member 23 in a pressing manner is further included, the unlocking mechanism 4 comprises a gland 41, a ratchet wheel 42, a limiting piece 43, a first linear spring 44, a limiting piece 45 and a torsion spring 46, the gland 41 is connected to one side, far away from each other, of the fixed frame 22 in a rotating manner, the first linear spring 44 is uniformly connected between the gland 41 and the adjacent fixed frame 22, three first linear springs 44 are included, the ratchet wheel 42 is connected to one side, far away from each other, of the rotating member 23, the ratchet wheel 42 on the left side is located at the left part of the fixed frame 22 on the left side, the ratchet wheel 42 on the right side is located at the right part of the fixed frame 22 on the right side, the limiting piece 45 is connected to the limiting piece 45 in a rotating manner, the limiting piece 45 is clamped by the limiting piece 45, the limiting piece 43 is welded to one side, near to each other, the limiting piece 43 is located at the lower part of the limiting piece 45.

In the downward swing adjustment process of the first auxiliary frame 21, the rotating member 23 drives the ratchet wheel 42 to rotate anticlockwise, the ratchet wheel 42 continuously extrudes and dials the limiting block 45 to enable the limiting block 45 to continuously rotate clockwise, the torsion spring 46 can drive the limiting block 45 to continuously rotate and reset, the limiting block 45 can not rotate anticlockwise due to the fact that the limiting block 45 is propped against the lower side of the limiting block 43, and further the first auxiliary frame 21 is prevented from reversely resetting, so that the positions of the first auxiliary frame 21 and the second auxiliary frame 31 can be automatically locked, if the first auxiliary frame 21 and the second auxiliary frame 31 are required to be released, the pressing cover 41 can be pressed to the side close to each other, the first linear spring 44 is compressed to drive the limiting block 43 to release the limiting block 45 to the side close to each other, then the ratchet wheel 42 can not lock the ratchet wheel 42 at the same time, further the first auxiliary frame 21 and the second auxiliary frame 31 are enabled to rotate and fold, the pressing cover 41 is released, the pressing cover 41 and the limiting block 43 are driven to move and reset under the action of the first linear spring 44, and the limiting block 43 is locked again.

As shown in fig. 1,2, 11, 12 and 13, the device further comprises a protection mechanism 5 for protecting the back of the brain of the user, the protection mechanism 5 comprises a supporting plate 51, sliding sleeves 52, telescopic rods 53 and second linear springs 54, the sliding sleeves 52 are uniformly connected to the front sides of the lower parts of the second auxiliary frames 31, six sliding sleeves 52 are arranged, the sliding sleeves 52 are all connected with the telescopic rods 53 in a sliding mode, the second linear springs 54 are all connected between the telescopic rods 53 and the sliding sleeves 52, and the supporting plate 51 is connected between the front parts of the telescopic rods 53.

When the helmet is worn, the supporting plate 51 is attached to the hindbrain scoop of the user, and under the action of the second linear spring 54, the supporting plate 51 can protect the hindbrain scoop of the user.

As shown in fig. 2, 14 and 15, the device further comprises an adjusting mechanism 6 for adjusting the distance between the supporting plate 51 and the back of the brain of the user, the adjusting mechanism 6 comprises an arc-shaped wedge 62, sliding grooves 61 are formed in the left side and the right side of the inner top wall of the main frame 1, and the sliding grooves 61 are connected with the arc-shaped wedge 62 in a sliding mode.

When a user uses the helmet, if the back spoon of the user is smaller, the supporting plate 51 cannot be attached to the back spoon, the arc-shaped wedge piece 62 can slide downwards along the sliding groove 61, when the arc-shaped wedge piece 62 is contacted with the supporting plate 51, the supporting plate 51 is driven to move forwards, the supporting plate 51 is attached to the back spoon of the user, the telescopic rod 53 is also moved forwards, the second linear spring 54 is stretched, the distance between the supporting plate 51 and the back spoon of the user can be adjusted according to the size of the back spoon of the user, the arc-shaped wedge piece 62 can be slid upwards to reset when the helmet is not used, and when the arc-shaped wedge piece 62 is separated from the supporting plate 51, the telescopic rod 53 and the supporting plate 51 are driven to move backwards to reset under the action of the second linear spring 54.

As shown in fig. 1, 2, 16 and 17, the utility model further comprises a winding and binding mechanism 7 for fixing the main frame body 1 at the chin position of a user in a winding and binding mode, the winding and binding mechanism 7 comprises a fixed frame 71, a second spring 72, a winding drum 73 and a protective belt 74, the left side and the right side of the bottom of the main frame body 1 are respectively connected with the fixed frame 71, the winding drums 73 are respectively and rotatably connected in the fixed frame 71, the protective belt 74 is wound between the winding drums 73, the lower part of the protective belt 74 penetrates out of the fixed frame 71, and the second spring 72 is respectively connected between the front part of the winding drum 73 and the fixed frame 71.

As shown in fig. 16, the utility model further comprises a rubber pad 75, and the lower part of the protective belt 74 is connected with the rubber pad 75.

When the helmet is used, the protective belt 74 is pulled out, the winding drum 73 rotates along with the protective belt, the second spring 72 is twisted, then the rubber pad 75 is buckled at the chin position of a user, the chin of the user can be more comfortable through the rubber pad 75, then the hands are loosened, and under the action of the second spring 72, the winding drum 73 is driven to reversely rotate, reset and wind the protective belt 74, so that the helmet can be fixed.

The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related arts are included in the scope of the present invention.

Claims

1. The foldable helmet comprises a main frame body (1), wherein the main frame body (1) is used for protecting a head, and is characterized by further comprising a contraction mechanism (2) and a folding mechanism (3), wherein the contraction mechanism (2) is arranged on the main frame body (1), the face of a user is shielded and protected by the contraction mechanism (2), the folding mechanism (3) is arranged between the main frame body (1) and the contraction mechanism (2), and when the contraction mechanism (2) is driven to be unfolded, the folding mechanism (3) is automatically rotated and unfolded to protect a back brain spoon of the user;

The contraction mechanism (2) comprises a first auxiliary frame body (21), a fixing frame (22), rotating pieces (23) and a first spring (24), wherein the left side and the right side of the lower portion of the main frame body (1) are connected with the fixing frame (22) through bolts, the fixing frame (22) is rotatably connected with the rotating pieces (23) through damping sleeves, the first auxiliary frame body (21) is connected between the rotating pieces (23), the first auxiliary frame body (21) is used for protecting the face of a user, a first spring (24) is connected between one side, away from each other, of the rotating pieces (23) and the fixing frame (22), and the first spring (24) is wound on the rotating pieces (23);

The unlocking mechanism (4) is used for unlocking the rotating piece (23) in a pressing mode, the unlocking mechanism (4) comprises a gland (41), a ratchet wheel (42), a limiting piece (43), a first linear spring (44), a limiting block (45) and a torsion spring (46), the gland (41) is connected to one side, far away from each other, of the fixed frame (22), the first linear spring (44) is uniformly connected between the gland (41) and the adjacent fixed frame (22), the ratchet wheel (42) is connected to one side, far away from each other, of the rotating piece (23), the ratchet wheel (42) on the left side is positioned at the left part of the fixed frame (22) on the left side, the ratchet wheel (42) on the right side is positioned at the right part of the fixed frame (22), the rear part of the fixed frame (22) is rotationally connected with a limiting block (45), the limiting block (45) is clamped by the limiting block (42), the rotating piece (23) can only rotate anticlockwise and cannot rotate clockwise, the torsion spring (46) is connected between one side, near to each other, of the limiting block (41) is welded with the limiting piece (43), the limiting piece (43) is positioned at the lower part of the limiting block (45) on the right side, in the downward swing adjustment process of the first auxiliary frame body (21), the rotating piece (23) is driven to rotate anticlockwise, the ratchet wheel (42) rotates anticlockwise, the pressing cover (41) is used for pressing the pressing cover to the side close to each other, the limiting piece (43) is driven to release the limiting block (45) to the side close to each other, and the limiting block (45) cannot lock the ratchet wheel (42).

2. The collapsible helmet of claim 1, wherein the collapsible mechanism (3) comprises a second sub-frame (31), a fixed bar (32), a counter gear (33), a first counter gear (34) and a second straight gear (35), the lower rear portion of the main frame (1) is rotatably connected with the second sub-frame (31), the second sub-frame (31) protects the back of the user, the left and right sides of the second sub-frame (31) respectively pass through the main frame (1), the left and right sides of the second sub-frame (31) are respectively connected with the second straight gear (35), the side of the rotating member (23) close to each other is connected with the first counter gear (34), the first counter gear (34) is positioned between the inner sides of the first sub-frame (21), the left and right sides of the lower portion of the main frame (1) are respectively connected with two fixed bars (32), the adjacent fixed bars (32) are positioned below the rotating member (23), the fixed bars (32) are respectively connected with the second straight gear (35), the front portion (33) and the second counter gear (33) are meshed with the second counter gear (34) and the second counter gear (33) which rotate downwards, the second sub-frame (31) is swung downward in synchronization with the engagement between the counter gear (33) and the second spur gear (35).

3. The foldable helmet according to claim 2, further comprising a protection mechanism (5) for protecting the user's hindbrain, wherein the protection mechanism (5) comprises a supporting plate (51), a sliding sleeve (52), a telescopic rod (53) and a second linear spring (54), the sliding sleeve (52) is uniformly connected to the front side of the lower portion of the second auxiliary frame (31), the telescopic rod (53) is slidably connected to the sliding sleeve (52), the second linear spring (54) is connected between the telescopic rod (53) and the sliding sleeve (52), the supporting plate (51) is connected between the front portions of the telescopic rod (53), and the supporting plate (51) is used for supporting the user's hindbrain.

4. A collapsible helmet according to claim 3, further comprising an adjusting mechanism (6) for adjusting the distance between the support plate (51) and the back of the user, wherein the adjusting mechanism (6) comprises arc-shaped wedge-shaped pieces (62), sliding grooves (61) are formed in the left and right sides of the inner top wall of the main frame body (1), arc-shaped wedge-shaped pieces (62) are connected to the sliding grooves (61) in a sliding manner, and the arc-shaped wedge-shaped pieces (62) slide downwards to push the support plate (51) forwards and bring the support plate (51) close to the back of the user.

5. The foldable helmet according to claim 4, further comprising a winding and binding mechanism (7) for fixing the main frame body (1) at the chin position of the user in a winding and binding manner, wherein the winding and binding mechanism (7) comprises a fixed frame (71), a second spring (72), a winding drum (73) and a protective belt (74), the fixed frame (71) is connected to the left side and the right side of the bottom of the main frame body (1), the winding drum (73) is rotatably connected to the inside of the fixed frame (71), the protective belt (74) is wound between the winding drums (73), the protective belt (74) is wound around the chin position of the user, so that the main frame body (1) is fixed, the lower part of the protective belt (74) penetrates out of the fixed frame (71), and the second spring (72) is connected between the front part of the winding drum (73) and the fixed frame (71).

6. The collapsible helmet of claim 5, further comprising a rubber pad (75), wherein the rubber pad (75) is connected to a lower portion of the protective strap (74).