Adjustable helmet

Abstract

The utility model belongs to the technical field of cleaning tools, and particularly relates to an adjustable helmet which comprises a shell and a lining arranged in the shell, an adjusting device used for adjusting the lining is arranged on the shell, the adjusting device comprises a rotary knob arranged on the rear portion of the shell and two flexible side hoops arranged on the inner side of the shell, a gear is connected to the rotary knob, and the gear is connected to the outer side of the shell. Each flexible side hoop comprises a side hoop body, a fixing part and a rack part are arranged on the two sides of each side hoop body respectively, the fixing parts are fixedly connected with the front portion of the shell, and the two side hoop bodies are bent to enable the rack parts to be meshed with the gears respectively. The flexible side hoop is arranged between the shell and the lining and abuts against the outer side of the lining, and the gear drives the rack part to move so as to change the length of the side hoop between the gear and the fixing part, so that the side hoop body is far away from or close to the center of the lining, and the size of the opening of the lining is adjusted. The utility model aims to provide the adjustable helmet which is simple in structure and good in comfort.

Description

Technical Field

[0001] The utility model belongs to the technical field of helmets, and in particular relates to an adjustable helmet. Background Art

[0002] A helmet is a head protector and an indispensable tool for people in transportation. Most helmets on the market include a hard outer shell with an inner lining adapted to the user's head.

[0003] In order to make the lining suitable for users with different head circumferences, some helmets are provided with an adjustment device for adjusting the lining on the inside, such as the helmet adjuster and helmet disclosed in Chinese utility model patent CN 202122183435.2, which includes: a rotating member, the rotating member is located behind the rear shell of the helmet; a transmission member, the transmission member is located in front of the rear shell of the helmet, the transmission member includes a first connecting end, a spacing compensation structure, and a second connecting end connected in sequence, the first connecting end and the second connecting end are arranged in front and back, the first connecting end is connected to the rotating wheel, and the second connecting end is connected to the rotating member, and the spacing compensation structure is used to compensate for the change in the spacing between the first connecting end and the second connecting end; the rotation of the rotating member can drive the transmission member and the rotating wheel to rotate. The rotating member can be rotated more easily, thereby flexibly adjusting the size of the head circumference to adapt to the user's head shape.

[0004] Although the above structure is convenient for users to adjust, the transmission member is easy to pass through the helmet during use, which causes the transmission member to easily contact the user's neck during use, affecting the comfort of the helmet. Summary of the Invention

[0005] In order to overcome the defects in the prior art, the purpose of the present invention is to provide an adjustable helmet with a simple structure and good comfort.

[0006] The purpose of this utility model is achieved in this way:

[0007] An adjustable helmet includes a shell and an inner liner disposed within the shell. The shell is provided with an adjustment device for adjusting the inner liner. The adjustment device includes a knob disposed at the rear of the shell and two flexible side hoops disposed inside the shell. The knob is connected to a gear. The flexible side hoops include a side hoop body. A fixing portion and a rack portion are respectively provided on both sides of the side hoop body. The fixing portion is fixedly connected to the front of the shell. The two side hoop bodies are bent so that the rack portions are respectively engaged with the gears. When the knob is turned, the two flexible side hoops are moved synchronously under the drive of the gears.

[0008] The flexible side hoop is arranged between the outer shell and the liner, and the flexible side hoop is against the outside of the liner. The gear drives the rack part to move, thereby changing the length of the side hoop between the gear and the fixed part, so that the side hoop body moves away from or close to the center of the liner, thereby adjusting the size of the liner mouth.

[0009] The utility model is further configured as follows: an elastic damping portion is provided on the knob, the adjusting device includes a fixed seat, and the fixed seat is provided with a plurality of arc-shaped tooth grooves adapted to the elastic damping portion. The elastic damping portion and the arc-shaped tooth grooves cooperate to limit the relative movement of the adjusting device and the fixed seat, and under the action of external force, the elastic damping portion can be disengaged from the arc-shaped tooth grooves, thereby causing the adjusting device and the housing to rotate relative to each other.

[0010] The utility model is further configured as follows: the knob includes a control member and a driving member that are rotatably connected, the gear and the elastic damping part are both arranged on the driving member, and a shift rod is provided on the control member; when the control member is rotated, the shift rod can abut against the elastic damping part and drive the elastic damping part to disengage from the arc-shaped tooth groove, so that the control member can drive the driving member to rotate relative to the fixed seat.

[0011] The utility model is further configured as follows: the elastic damping part is provided with a driving inclined surface adapted to the shift rod, the shift rod slides relatively along the driving inclined surface and drives the elastic damping part to deform, and a limiting protrusion is provided at one end of the driving inclined surface, which can abut against the shift rod and prevent the shift rod from separating from the driving inclined surface.

[0012] The utility model is further configured as follows: a limit shift groove is provided on the control member, a limit block is provided on the driving member, the limit block is swingably arranged in the limit shift groove to prevent the shift rod from being separated from the elastic damping member, and the two ends of the limit swing groove can abut against the limit block and drive the driving member to rotate through the limit block.

[0013] The utility model is further configured as follows: the control member includes a detachably connected rotating body and a connecting seat, the connecting seat is rotatably connected to the fixed seat, the driving member is rotatably arranged on the connecting seat, and the connecting seat is provided with a first hook and a driving protrusion, the rotating body is provided with a first slot and a driving slot adapted to the driving protrusion, the first hook cooperates with the first slot to make the rotating body and the connecting seat detachably connected, and the side wall of the driving slot abuts against the driving protrusion and drives the connecting seat to rotate.

[0014] The utility model is further configured as follows: the adjusting device includes a fixing seat, a mounting hole and a mounting groove adapted to the fixing seat are provided on the outer shell, the fixing seat is arranged in the mounting hole and is detachably connected to the knob, and the knob and the fixing seat are respectively pressed against both ends of the mounting hole to prevent the fixing seat and the adjusting device from being separated from the outer shell.

[0015] The utility model is further configured as follows: a sleeve is fixedly arranged in the mounting hole, the sleeve is detachably connected to the fixing seat, and the knob is passed through the sleeve and is detachably connected to the adjusting device.

[0016] The utility model is further configured as follows: the fixing seat includes a main body and a cover plate that are detachably connected, a guide groove is provided in the main body, and a second hook is provided on the outer side of the guide groove side wall, a second slot adapted to the second hook is provided on the side wall of the sleeve, the cover plate is detachably arranged in the guide groove and the rack portion is hidden in the guide groove, and the cover plate abuts against the inner side of the guide groove side wall to prevent the guide groove side wall from being deformed so as to cause the second hook to disengage from the second slot.

[0017] The utility model is further configured as follows: the shell includes a hard shell and a buffer layer arranged in the hard shell, a U-shaped fixing piece is fixedly provided at the lower end of the front portion of the buffer layer, the fixing portion is detachably connected to the fixing piece, a fixing groove is provided on the upper side of the fixing piece, the lower end of the buffer layer is passed through the fixing groove and is detachably connected to the fixing piece.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] 1. In the present invention, the two flexible side hoops are controlled to move synchronously by rotating the knob, and the length of the side hoops between the gear and the fixed part is changed, thereby adjusting the size of the liner opening. The structure is simple and convenient for the user to adjust and control. Since the flexible side hoops are arranged between the outer shell and the inner liner, the flexible side hoops are avoided from directly contacting the user's head during use, which is conducive to improving the comfort of the helmet. In addition, in this structure, the user's flexible side hoops drive the two sides of the liner to rest against the two sides of the user's head, which can reduce the relative rotation of the helmet and the user's head during use, making it convenient for the user to use.

[0020] 2. The setting of the elastic damping part and the arc-shaped tooth groove in the utility model can limit the free rotation of the knob, thereby preventing the gear from accidentally driving the rack part to move during use and affecting the adaptation of the lining to the user's head, making it convenient for the user to use; the user can drive the gear to move and drive the elastic damping part to disengage from the arc-shaped tooth groove by rotating the control part. The structure is simple and convenient for the user to control and adjust.

[0021] 3. The setting of the driving inclined surface in the present invention facilitates the deformation of the elastic damping part driven by the shift lever, and the setting of the limiting protrusion avoids the accidental separation of the shift lever and the driving inclined surface during use, and avoids the inability of the shift lever to re-match with the driving inclined surface after the shift lever and the driving inclined surface are separated, thereby causing damage to the adjustment device, which is beneficial to extending the service life of the adjustment device, and the shift lever can be abutted against the limiting protrusion and drive the driving part to rotate, which is convenient for the control part to drive the driving part to rotate; the structure of the limiting shift groove and the limiting block is simple, which is convenient for the control part to drive the driving part to rotate; the detachable rotating body and the connecting seat are convenient for the production and processing of the control part, and convenient for the assembly and production of the helmet.

[0022] 4. The setting of the detachably connected fixing seat and the knob in the present invention facilitates the stable installation of the adjusting device on the shell, which is convenient for the assembly of the helmet. The setting of the mounting groove can not only prevent the fixing seat from rotating relative to the shell, but also prevent the fixing seat from protruding from the inside of the shell, which is beneficial to improving the comfort of the helmet; the setting of the sleeve is conducive to the stable installation of the adjusting device, avoids direct contact between gears and other components and the shell and affects the relative rotation of the knob, and is convenient for users to use; the detachably connected main body and cover plate facilitate the production and processing of the guide groove, and are conducive to the stable installation of the sleeve and the fixing seat, avoiding accidental separation of the sleeve and the fixing seat during use.

[0023] 5. The provision of the fixing piece and the fixing groove in the present invention facilitates the stable installation of the flexible side hoop and the dispersion of the stress on the buffer layer, thereby preventing the buffer layer from being damaged due to excessive stress in a local area. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the utility model when the inner lining is removed;

[0025] Figure 2 It is a cross-sectional view of the utility model when the inner lining is removed;

[0026] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle;

[0027] Figure 4 It is an exploded schematic diagram of the regulating device in the utility model;

[0028] Figure 5 It is a structural diagram of the fixing member in the utility model;

[0029] Figure 6 It is a structural diagram of the sleeve in the utility model;

[0030] Figure 7 It is a cross-sectional view of the regulating device in the utility model;

[0031] Figure 8 It is a structural diagram of the rotating body in the utility model;

[0032] Figure 9 This is one of the structural diagrams of the connecting seat in the utility model;

[0033] Figure 10 This is the second structural diagram of the connecting seat in the utility model;

[0034] Figure 11 This is a schematic diagram of the structure of the driving part in the utility model;

[0035] Figure 12 It is a structural diagram of the flexible side hoop in the utility model;

[0036] Figure 13 It is an exploded schematic diagram of the fixing seat in the utility model;

[0037] Figure 14 It is a structural diagram of the main body in the utility model.

[0038] Meaning of the reference numerals in the figure: 1-housing; 11-hard housing; 12-buffer layer; 13-fixing member; 14-mounting slot; 15-sleeve; 121-mounting hole; 131-fixing slot; 132-fixing hole; 151-second slot;

[0039] 152 - fixed protrusion; 2 - knob; 3 - control member; 31 - rotating body; 32 - connecting seat; 311 - slot; 312 - first card slot; 313 - driving slot; 321 - storage slot; 322 - hinged protrusion;

[0040] 323 - lever; 324 - limiting slot; 325 - plug-in portion; 326 - first hook; 327 - driving ridge; 4 - driving member; 41 - gear; 42 - elastic damping portion; 43 - driving slope; 44 - limiting protrusion;

[0041] 45-limiting block; 46-hinge hole; 5-flexible side hoop; 51-side hoop body; 52-fixing portion; 53-rack portion; 6-fixing seat; 61-body; 62-cover plate; 63-guide groove; 631-port; 64-second hook;

[0042] 65-arc-shaped tooth groove. DETAILED DESCRIPTION

[0043] The present invention will be further described below with reference to specific embodiments in conjunction with the accompanying drawings:

[0044] See also Figures 1 to 14 As shown, an adjustable helmet includes a shell 1 and an inner liner disposed in the shell 1. The shell 1 is provided with an adjustment device for adjusting the inner liner. The adjustment device includes a knob 2 disposed at the rear of the shell 1 and two flexible side hoops 5 disposed on the inner side of the shell 1. The knob 2 is connected to a gear 41. The flexible side hoops 5 include a side hoop body 6151. A fixing portion 52 and a rack portion 53 are respectively provided on both sides of the side hoop body 6151. The fixing portion 52 is fixedly connected to the front of the shell 1. The two side hoop bodies 6151 are bent and the rack portions 53 are respectively engaged with the gear 41. When the knob 2 is turned, the two flexible side hoops 5 move synchronously under the drive of the gear 41.

[0045] The flexible side hoop 5 is arranged between the outer shell 1 and the liner, and the flexible side hoop 5 is against the outside of the liner. The gear 41 drives the rack part 53 to move, thereby changing the length of the side hoop between the gear 41 and the fixed part 52, so that the side hoop body 6151 is away from or close to the center of the liner, thereby adjusting the size of the liner mouth.

[0046] In the above structure, the two flexible side hoops 5 are controlled to move synchronously by rotating the knob 2, and the length of the side hoops between the gear 41 and the fixing part 52 is changed, so as to adjust the size of the lining mouth. The structure is simple and convenient for the user to adjust and control. Since the flexible side hoops 5 are arranged between the outer shell 1 and the lining, the flexible side hoops 5 are avoided from directly contacting the user's head during use, which is beneficial to improving the comfort of the helmet. In addition, in this structure, the user's flexible side hoops 5 drive the two sides of the lining to press against the two sides of the user's head, which can reduce the relative rotation of the helmet and the user's head during use, making it convenient for the user to use.

[0047] The lining is a common structure on helmets. Since the lining will block the flexible side hoops 5, the flexible side hoops 5 are not shown in the drawings of the specification. However, those skilled in the art can implement the technical solution of the present invention based on their own experience.

[0048] The shell 1 described in the present invention includes a hard shell 11 and a buffer layer 12 arranged in the hard shell 11. A U-shaped fixing part 13 is fixedly provided at the lower end of the front part of the buffer layer 12. A fixing hole 132 is provided on the fixing part 13. The fixing portion 52 is detachably connected to the fixing hole 132. A fixing groove 131 is provided on the upper side of the fixing part 13. The lower end of the buffer layer 12 is passed through the fixing groove 131 and is detachably connected to the fixing part 13. The setting of the fixing part 13 and the fixing groove 131 facilitates the stable installation of the flexible side hoop 5 and facilitates the dispersion of the force on the buffer layer 12, thereby avoiding damage to the buffer layer 12 due to excessive local force.

[0049] The knob 2 is provided with an elastic damping portion 42, and the adjusting device includes a fixing seat 6, and the fixing seat 6 is provided with a plurality of arc-shaped tooth grooves 65 adapted to the elastic damping portion 42. The elastic damping portion 42 and the arc-shaped tooth grooves 65 cooperate to limit the relative movement of the adjusting device and the fixing seat 6, and under the action of external force, the elastic damping portion 42 can be disengaged from the arc-shaped tooth grooves 65, so that the adjusting device and the shell 1 can rotate relative to each other. The setting of the elastic damping portion 42 and the arc-shaped tooth grooves 65 can limit the free rotation of the knob 2, avoid the gear 41 accidentally driving the rack portion 53 to move during use, and affect the adaptation of the lining to the user's head, making it convenient for the user to use.

[0050] In the present invention, the elastic damping portion 42 and the arcuate tooth groove 65 are both provided with inclined side walls. When the knob 2 is driven by external force, the elastic damping portion 42 can be disengaged from the arcuate tooth groove 65 through the guidance of the inclined side walls. However, this operation is relatively laborious. Therefore, in this embodiment, the knob 2 preferably includes a rotatably connected control member 3 and a driving member 4, the gear 41 and the elastic damping portion 42 are both provided on the driving member 4, and a lever 323 is provided on the control member 3; when the control member 3 is rotated, the lever 323 can abut against the elastic damping portion 42 and drive the elastic damping portion 42 to disengage from the arcuate tooth groove 65, so that the control member 3 can drive the driving member 4 and the fixed seat 6 to rotate relative to each other. In this structure, the user can drive the gear 41 to move and drive the elastic damping portion 42 to disengage from the arcuate tooth groove 65 by rotating the control member 3. The structure is simple and convenient for the user to control and adjust.

[0051] The lever 323 can abut against the limiting protrusion 44 and drive the driving member 4 to rotate, so that the control member 3 drives the driving member 4 to rotate.

[0052] In this embodiment, it is preferred that a limit shift groove 324 is provided on the control member 3, and a limit block 45 is provided on the driving member 4. The limit block 45 is swingably set in the limit shift groove 324 to prevent the lever 323 from being separated from the elastic damping member, and the two ends of the limit swing groove can abut against the limit block 45 and drive the driving member 4 to rotate through the limit block 45. The structure of the limit shift groove 324 and the limit block 45 is simple, which is convenient for the control member 3 to drive the driving member 4 to rotate, and can prevent the lever 323 from being separated from the driving inclined surface 43.

[0053] The control member 3 includes a detachably connected rotating body 31 and a connecting seat 32, the connecting seat 32 is rotatably connected to the fixed seat 6, the driving member 4 is rotatably set on the connecting seat 32, and the connecting seat 32 is provided with a first hook 326 and a driving protrusion 327, the rotating body 31 is provided with a first slot 312 and a driving slot 313 adapted to the driving protrusion 327, the first hook 326 cooperates with the first slot 312 to make the rotating body 31 and the connecting seat 32 detachably connected, and the side wall of the driving slot 313 abuts against the driving protrusion 327 and drives the connecting seat 32 to rotate. The detachably connected rotating body 31 and connecting seat 32 facilitate the production and processing of the control member 3 and facilitate the assembly and production of the helmet.

[0054] In this embodiment, a slot 311 is provided on the rotating body 31, and the first hook 326 and the driving protrusion 327 are both provided on the side walls of the slot 311, and a plug-in portion 325 adapted to the slot 311 is provided on the connecting seat 32, and the first hook 326 and the driving protrusion 327 are provided on the side walls of the plug-in portion 325.

[0055] In this embodiment, a receiving groove 321 is provided on the connecting seat 32, the shift rod 323 and the limit swing groove are both provided in the receiving groove 321, and a hinge protrusion 322 is provided in the receiving groove 321, and a hinge hole 46 adapted to the hinge protrusion 322 is provided on the driving member 4.

[0056] The shell 1 described in the present invention is provided with a mounting hole 121 and a mounting groove 14 adapted to the fixing seat 6. The fixing seat 6 is arranged in the mounting hole 121 and is detachably connected to the knob 2. The knob 2 and the fixing seat 6 are respectively pressed against the two ends of the mounting hole 121 to prevent the fixing seat 6 and the adjustment device from being separated from the shell 1. This structure facilitates the stable installation of the adjustment device on the shell 1 and facilitates the assembly of the helmet. The setting of the mounting groove 14 can not only prevent the fixing seat 6 from rotating relative to the shell 1, but also prevent the fixing seat 6 from protruding from the inside of the shell 1, which is conducive to improving the comfort of the helmet.

[0057] A sleeve 15 is fixedly arranged in the mounting hole 121, and the sleeve 15 is detachably connected to the fixing seat 6, and the knob 2 is inserted into the sleeve 15 and detachably connected to the adjusting device. The arrangement of the sleeve 15 is conducive to the stable installation of the adjusting device, avoids direct contact between components such as the gear 41 and the housing 1 and affects the relative rotation of the knob 2, and is convenient for users to use. In this embodiment, a fixing protrusion 152 is arranged on the outside of the sleeve 15, and the fixing protrusion 152 is integrally injection-molded in the housing 1.

[0058] Preferably, the fixing seat 6 and the sleeve 15 can be detachably connected by fasteners or a clamping structure. In this embodiment, the fixing seat 6 includes a detachably connected main body 61 and a cover plate 62. A guide groove 63 is provided in the main body 61. The gear 41 passes through the guide groove 63 and cooperates with the rack portion 53. Ports 631 are respectively provided at both ends of the guide groove 63. The two flexible side hoops 5 respectively pass through the guide groove 63 from the two ports 631 and cooperate with the upper and lower sides of the gear 41.

[0059] A second hook 64 is provided on the outer side of the side wall of the guide groove 63, and a second groove 151 adapted to the second hook 64 is provided on the side wall of the sleeve 15. The cover plate 62 is detachably arranged in the guide groove 63 and the rack portion 53 is hidden in the guide groove 63, and the cover plate 62 abuts against the inner side of the side wall of the guide groove 63 to prevent the side wall of the guide groove 63 from being deformed so as to cause the second hook 64 to be separated from the second groove 151. The detachably connected main body 61 and cover plate 62 facilitate the production and processing of the guide groove 63, and are conducive to the stable installation of the sleeve 15 and the fixing seat 6, thereby preventing the sleeve 15 from being accidentally separated from the fixing seat 6 during use.

[0060] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. An adjustable helmet comprising an outer shell (1) and an inner lining arranged in the outer shell (1), wherein the outer shell (1) is provided with an adjusting device for adjusting the inner lining, characterized in that: The adjusting device comprises a knob (2) arranged at the rear of the housing (1) and two flexible side hoops (5) arranged on the inner side of the housing (1); the knob (2) is connected to a gear (41); the flexible side hoops (5) comprise a side hoop body (51); a fixing portion (52) and a rack portion (53) are respectively provided on both sides of the side hoop body (51); the fixing portion (52) is fixedly connected to the front of the housing (1); the two side hoop bodies (51) are bent and the rack portions (53) are respectively engaged with the gear (41); when the knob (2) is turned, the two flexible side hoops (5) are driven by the gear (41) to move synchronously; The flexible side hoop (5) is arranged between the outer shell (1) and the inner liner, and the flexible side hoop (5) is pressed against the outer side of the inner liner. The gear (41) drives the rack portion (53) to move, thereby changing the length of the side hoop between the gear (41) and the fixing portion (52), so that the side hoop body (51) is moved away from or close to the center of the inner liner, thereby adjusting the size of the inner liner opening.

2. The adjustable helmet according to claim 1, characterized in that: The knob (2) is provided with an elastic damping portion (42), and the adjusting device includes a fixing seat (6). The fixing seat (6) is provided with a plurality of arc-shaped tooth grooves (65) adapted to the elastic damping portion (42). The elastic damping portion (42) cooperates with the arc-shaped tooth grooves (65) to limit the relative movement between the adjusting device and the fixing seat (6). Under the action of an external force, the elastic damping portion (42) can be disengaged from the arc-shaped tooth grooves (65), thereby allowing the adjusting device and the housing (1) to rotate relative to each other.

3. The adjustable helmet according to claim 2, characterized in that: The knob (2) comprises a control member (3) and a driving member (4) which are rotatably connected. The gear (41) and the elastic damping portion (42) are both arranged on the driving member (4). A shifting rod (323) is arranged on the control member (3); when the control member (3) is rotated, the shifting rod (323) can abut against the elastic damping portion (42) and drive the elastic damping portion (42) to disengage from the arc-shaped tooth groove (65), thereby enabling the control member (3) to drive the driving member (4) and the fixing seat (6) to rotate relative to each other.

4. The adjustable helmet according to claim 3, characterized in that: The elastic damping portion (42) is provided with a driving inclined surface (43) adapted to the shifting rod (323); the shifting rod (323) slides relatively along the driving inclined surface (43) and drives the elastic damping portion (42) to deform; and a limiting protrusion (44) is provided at one end of the driving inclined surface (43); the limiting protrusion (44) can abut against the shifting rod (323) and prevent the shifting rod (323) from separating from the driving inclined surface (43).

5. The adjustable helmet according to claim 3, characterized in that: The control member (3) is provided with a limit shifting groove (324), and the driving member (4) is provided with a limit block (45). The limit block (45) is swingably arranged in the limit shifting groove (324) to prevent the shifting rod (323) from being separated from the elastic damping member, and the two ends of the limit swinging groove can abut against the limit block (45) and drive the driving member (4) to rotate through the limit block (45).

6. The adjustable helmet according to claim 3, characterized in that: The control member (3) comprises a detachably connected rotating body (31) and a connecting seat (32), the connecting seat (32) being rotatably connected to the fixed seat (6), the driving member (4) being rotatably arranged on the connecting seat (32), and the connecting seat (32) being provided with a first hook (326) and a driving protrusion (327), the rotating body (31) being provided with a first slot (312) and a driving slot (313) adapted to the driving protrusion (327), the first hook (326) being matched with the first slot (312) so that the rotating body (31) and the connecting seat (32) are detachably connected, and the side wall of the driving slot (313) abuts against the driving protrusion (327) and drives the connecting seat (32) to rotate.

7. The adjustable helmet according to claim 1, characterized in that: The adjusting device comprises a fixing seat (6); a mounting hole (121) and a mounting groove (14) adapted to the fixing seat (6) are provided on the housing (1); the fixing seat (6) is arranged in the mounting hole (121) and is detachably connected to the knob (2); and the knob (2) and the fixing seat (6) respectively abut against both ends of the mounting hole (121) to prevent the fixing seat (6) and the adjusting device from being separated from the housing (1).

8. The adjustable helmet according to claim 7, characterized in that: A sleeve (15) is fixedly arranged in the mounting hole (121), the sleeve (15) is detachably connected to the fixing seat (6), and the knob (2) is inserted into the sleeve (15) and detachably connected to the adjusting device.

9. The adjustable helmet according to claim 7, characterized in that: The fixing seat (6) comprises a main body (61) and a cover plate (62) that are detachably connected. A guide groove (63) is provided in the main body (61), and a second hook (64) is provided on the outer side of the side wall of the guide groove (63). A second hook (151) adapted to the second hook (64) is provided on the side wall of the sleeve (15). The cover plate (62) is detachably arranged in the guide groove (63) so that the rack portion (53) is hidden in the guide groove (63), and the cover plate (62) abuts against the inner side of the side wall of the guide groove (63) to prevent the side wall of the guide groove (63) from deforming and causing the second hook (64) to disengage from the second hook (151).

10. The adjustable helmet according to claim 1, characterized in that: The housing (1) comprises a hard shell (11) and a buffer layer (12) arranged in the hard shell (11); a U-shaped fixing piece (13) is fixedly arranged at the front lower end of the buffer layer (12); the fixing portion (52) is detachably connected to the fixing piece (13); a fixing groove (131) is provided on the upper side of the fixing piece (13); the lower end of the buffer layer (12) is inserted into the fixing groove (131) and is detachably connected to the fixing piece (13).

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