CN218978121U

CN218978121U - Helmet regulator

Info

Publication number: CN218978121U
Application number: CN202223316083.4U
Authority: CN
Inventors: 吴锦荣
Original assignee: Jiangmen Dahe Sporting Goods Technology Co ltd
Current assignee: Jiangmen Dahe Sporting Goods Technology Co ltd
Priority date: 2022-12-09
Filing date: 2022-12-09
Publication date: 2023-05-09
Anticipated expiration: 2032-12-09

Abstract

The utility model discloses a helmet regulator, which comprises a connecting mechanism and an adjusting mechanism, wherein the connecting mechanism comprises a left strap and a right strap, and the left strap and the right strap are respectively connected with a lining of a helmet; the adjusting mechanism comprises a shell, a first gear and a knob, the left strap is provided with a first rack part, the right strap is provided with a second rack part, the first rack part and the second rack part are respectively meshed with the front side and the rear side of the first gear, and the first gear rotates to drive the first rack part and the second rack part to mutually move reversely; the left strap has the first groove of holding first gear, and first rack portion sets up in one side of first groove, and first groove is spacing with first gear cooperation, and the right strap has the second groove of holding second gear, and second rack portion sets up in one side of second groove, and second groove is spacing with first gear cooperation. According to the helmet adjustor, when the first gear drives the left strap and the right strap to be away from each other, the first rack portion and the second rack portion are prevented from being separated from the first gear.

Description

Helmet regulator

Technical Field

The utility model relates to the technical field of helmet structures, in particular to a helmet regulator.

Background

The helmet is a protective tool for protecting the head of a person, is a hat worn by soldiers during training and battle, and is an indispensable tool in people transportation. The helmet is divided into a military helmet, a police helmet, a civil helmet and the like, is in a semicircular shape, and mainly comprises a shell, a lining and a hanging device.

Wherein the liner is mounted within the shell for fitting the head, the helmet is typically also provided with an adjustor to adjust the tightness of the liner due to the varying head circumference sizes of each individual's head.

Structurally, the regulator includes left band, right band and first gear, and the one end of left band and the one end of right band are connected with the lining respectively, and left band and right band are close to each other and keep away from in order to adjust the elasticity of lining, and wherein the other end of left band has first rack portion, and the other end of right band has second rack portion, first rack portion and second rack portion mesh with the radial both sides of first gear respectively, and first gear rotates in order to drive first rack portion and second rack portion mutual reverse movement to, make first gear drive left band and right band be close to each other or keep away from.

However, when the first gear drives the left strap and the right strap away from each other, the first rack portion and the second rack portion are easily separated from the first gear.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a helmet adjustor which can prevent a first rack part and a second rack part from being separated from a first gear when the first gear drives a left strap and a right strap to be far away from each other.

A helmet regulator according to an embodiment of the first aspect of the present utility model includes: the connecting mechanism comprises a left strap and a right strap, the left strap and the right strap are respectively connected with the lining of the helmet, and the left strap and the right strap are far away from each other and close to each other so as to adjust the tightness of the lining; the left strap and the right strap are both in sliding connection with the shell, the left strap is provided with a first rack part, the right strap is provided with a second rack part, the first rack part and the second rack part are respectively meshed with the front side and the rear side of the first gear, and the first gear rotates to drive the first rack part and the second rack part to mutually reversely move; the left strap has the holding the first groove of first gear, the length direction in first groove is followed the length direction setting of left strap, first rack portion sets up one side in first groove, first groove with first gear cooperation is spacing, the right strap has the holding the second groove of second gear, the length direction in second groove is followed the length direction setting of right strap, second rack portion sets up one side in second groove, the second groove with first gear cooperation is spacing.

According to the helmet regulator provided by the embodiment of the utility model, the helmet regulator has at least the following beneficial effects:

1. according to the helmet, the connecting mechanism is arranged and comprises the left binding belt and the right binding belt, the left binding belt and the right binding belt are respectively connected with the lining of the helmet, and the left binding belt and the right binding belt are far away from each other and close to each other so as to adjust tightness of the lining, so that the lining of the helmet can adapt to users with different head circumferences.

2. According to the utility model, the adjusting mechanism is arranged and comprises the shell, the first gear rotationally connected with the shell and the knob for driving the first gear to rotate, so that the shell can support the first gear and the knob to rotate, and the adjusting mechanism is more stable.

3. According to the utility model, the left strap and the right strap are both in sliding connection with the shell, so that the left strap and the right strap can move more stably.

4. According to the helmet, the first rack part is arranged on the left strap, the second rack part is arranged on the right strap, the first rack part and the second rack part are respectively meshed with the front side and the rear side of the first gear, and the first gear rotates to drive the first rack part and the second rack part to move in the opposite direction, so that the first gear rotates to drive the left strap and the right strap to approach or separate from each other, and further, the tightness of the lining of the helmet is quickly adjusted.

5. According to the utility model, the first groove for accommodating the first gear is formed in the left strap, the length direction of the first groove is formed along the length direction of the left strap, the first rack part is arranged on one side of the first groove, the first groove is in fit limit with the first gear, the right strap is provided with the second groove for accommodating the second gear, the length direction of the second groove is formed along the length direction of the right strap, the second rack part is arranged on one side of the second groove, the second groove is in fit limit with the first gear, and it can be understood that when the first gear drives the left strap and the right strap to be far away from each other, the first groove and the second groove can be respectively limited with the first gear, so that the moving range of the left strap and the right strap is limited, and the first rack part and the second rack part are prevented from being separated from the first gear.

According to some embodiments of the utility model, the housing has a first limiting portion and a second limiting portion, the first limiting portion and the second limiting portion are symmetrical along an axis of the first gear, the left strap and the right strap are accommodated between the first limiting portion and the second limiting portion to move, and the first limiting portion and the second limiting portion cooperate to limit the left strap and the right strap back and forth.

According to some embodiments of the utility model, the housing has a bottom wall and a top edge, between which the left strap and the right strap are accommodated for movement, the bottom wall and the top edge cooperate to limit the left strap and the right strap up and down.

According to some embodiments of the utility model, the adjusting mechanism further comprises a unidirectional locking piece, the unidirectional locking piece is located between a knob and the first gear, the unidirectional locking piece is coaxially connected with the first gear, the knob is used for driving the unidirectional locking piece to rotate, the unidirectional locking piece is provided with an elastic part, the elastic part deforms along the radial direction of the rotation axis of the unidirectional locking piece, the shell is provided with an inner ratchet ring for accommodating the unidirectional locking piece, the outer circle of the elastic part is provided with a convex tooth, the inner wall of the inner ratchet ring is provided with an inner ratchet, the convex tooth and the inner ratchet are matched to enable the unidirectional locking piece to rotate in one direction and lock in the other direction, the unidirectional locking piece rotates to drive the left strap and the right strap to be close to each other, and the unidirectional locking piece is locked to prevent the left strap and the right strap from being far away from each other.

According to some embodiments of the utility model, the one-way locking element has a mounting ring, the first gear has a mounting hole, the mounting hole accommodates the mounting ring, an outer side wall of the mounting ring has a convex part, a side wall of the mounting hole has a concave part for accommodating the convex part, and the convex part and the concave part are matched and limited.

According to some embodiments of the utility model, the knob has a mounting sleeve penetrating the mounting ring and the mounting hole, the mounting sleeve being deformable in a radial direction of the mounting sleeve, and a plug is provided for inserting into the mounting sleeve to fit an outer wall of the mounting sleeve against the first gear and the one-way locking member.

According to some embodiments of the utility model, the diameter of the plug pin tapers in a direction toward the mounting sleeve.

According to some embodiments of the utility model, a clamping groove is formed on the radial outer side of the elastic part, the knob is provided with a pin part, and the pin part is abutted with the clamping groove along two circumferential sides of the rotation axis of the unidirectional locking piece to drive the unidirectional locking piece to rotate.

According to some embodiments of the utility model, a side of the clamping groove near the center of the unidirectional locking piece is provided with an inclined wall, the inclined wall is obliquely arranged along the radial direction of the rotation axis of the unidirectional locking piece, and the pin part is matched with the inclined wall to drive the elastic part to deform along the direction near the center of the unidirectional locking piece so as to enable the convex teeth to be separated from the inner ratchet teeth.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic diagram of a helmet regulator according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view A-A shown in FIG. 1;

FIG. 3 is a mating view of the housing shown in FIG. 1 and a one-way latch;

FIG. 4 is a schematic view of the knob shown in FIG. 1;

FIG. 5 is a schematic view of the unidirectional locking element shown in FIG. 1;

fig. 6 is a schematic structural view of the first gear shown in fig. 1.

Reference numerals: 100-left strap, 110-right strap, 120-housing, 130-first gear, 140-knob, 150-first rack portion, 160-second rack portion, 170-first slot, 180-second slot, 190-first limit portion, 200-second limit portion, 210-bottom wall, 220-top edge, 230-one-way lock, 240-elastic portion, 250-inner ratchet ring, 260-lobe, 270-inner ratchet, 280-mounting ring, 290-mounting hole, 300-lobe, 310-concave portion, 320-mounting sleeve, 330-latch, 340-card slot, 350-pin portion, 360-inclined wall.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

A helmet regulator according to an embodiment of the present utility model is described below with reference to the accompanying drawings.

Referring to fig. 1 and 2, a helmet regulator according to an embodiment of the present utility model includes a connection mechanism and an adjustment mechanism.

For the coupling mechanism, the coupling mechanism includes left and

right straps

100 and 110, respectively, the left and

right straps

100 and 110 are connected with the lining of the helmet, and the left and

right straps

100 and 110 are far away from and close to each other to adjust the tightness of the lining, thereby enabling the lining of the helmet to be adapted to the wearing of users with different head circumferences.

Specifically, the liner abuts the front half of the head, and the left strap 100 and the right strap 110 are respectively connected with the two ends of the liner, so that the liner, the left strap 100 and the right strap 110 can be matched to hoop the head.

For the adjusting mechanism, the adjusting mechanism comprises a shell 120, a first gear 130 rotationally connected with the shell 120 and a knob 140 for driving the first gear 130 to rotate, so that the shell 120 can support the first gear 130 and the knob 140 to rotate, and the adjusting mechanism is more stable.

In some specific embodiments, both the left strap 100 and the right strap 110 are slidably coupled to the housing 120, thereby making movement of the left strap 100 and the right strap 110 smoother.

In some specific embodiments, the housing 120 has a first limiting portion 190 and a second limiting portion 200, the first limiting portion 190 and the second limiting portion 200 are symmetrical along the axis of the first gear 130, the left strap 100 and the right strap 110 are accommodated between the first limiting portion 190 and the second limiting portion 200, and the first limiting portion 190 and the second limiting portion 200 cooperate to limit the left strap 100 and the right strap 110 back and forth, so as to avoid the left strap 100 and the right strap 110 from shaking back and forth on the housing 120, and further, make the left strap 100 and the right strap 110 more stable on the housing 120.

In some specific embodiments, the housing 120 has a bottom wall 210 and a top edge 220, where the left strap 100 and the right strap 110 are accommodated between the bottom wall 210 and the top edge 220, and the bottom wall 210 and the top edge 220 cooperate to limit the left strap 100 and the right strap 110 up and down, so as to avoid the left strap 100 and the right strap 110 from shaking up and down on the housing 120, and further, make the left strap 100 and the right strap 110 more stable on the housing 120.

In some embodiments, the left strap 100 has a first rack portion 150, the right strap 110 has a second rack portion 160, the first rack portion 150 and the second rack portion 160 are respectively engaged with front and rear sides of the first gear 130, and the first gear 130 rotates to drive the first rack portion 150 and the second rack portion 160 to move in opposite directions with respect to each other, so that the rotation of the first teeth can drive the left strap 100 and the right strap 110 to approach or separate from each other, and thus, the tightness of the lining of the helmet can be rapidly adjusted.

In some specific implementations, the left strap 100 has a first slot 170 that accommodates the first gear 130, a length direction of the first slot 170 is set along a length direction of the left strap 100, the first rack portion 150 is set on one side of the first slot 170, the first slot 170 is limited by cooperation with the first gear 130, the right strap 110 has a second slot 180 that accommodates the second gear, a length direction of the second slot 180 is set along a length direction of the right strap 110, the second rack portion 160 is set on one side of the second slot 180, and the second slot 180 is limited by cooperation with the first gear 130.

It can be appreciated that when the first gear 130 drives the left strap 100 and the right strap 110 away from each other, the first slot 170 and the second slot 180 can be limited with the first gear 130, so that the movement range of the left strap 100 and the right strap 110 is limited, and the first rack portion 150 and the second rack portion 160 are prevented from being separated from the first gear 130.

Referring to fig. 2 and 3, in some embodiments, the adjusting mechanism further includes a unidirectional locking member 230, the unidirectional locking member 230 is located between the knob 140 and the first gear 130, the unidirectional locking member 230 is coaxially connected with the first gear 130, the knob 140 is used for driving the unidirectional locking member 230 to rotate, the unidirectional locking member 230 has an elastic portion 240, the elastic portion 240 deforms radially along a rotation axis of the unidirectional locking member 230, the housing 120 has an inner ratchet ring 250 accommodating the unidirectional locking member 230, an outer circle of the elastic portion 240 has a convex tooth 260, an inner wall of the inner ratchet ring 250 has an inner ratchet 270, the convex tooth 260 and the inner ratchet tooth 270 cooperate to enable the unidirectional locking member 230 to rotate in one direction and lock in the other direction, the unidirectional locking member 230 rotates to drive the left strap 100 and the right strap 110 to approach each other, the unidirectional locking member 230 locks to prevent the left strap 100 and the right strap 110 from moving away from each other, thereby preventing the left strap 100 and the right strap 110 from being forced to be pulled away from each other, and the liner, so that the left strap 100 and the right strap 110 can be fastened with the mating head.

It will be appreciated that when the knob 140 rotates in one direction, the knob 140 drives the unidirectional locking member 230 to rotate, the unidirectional locking member 230 drives the first gear 130 to rotate, so that the first gear 130 drives the left strap 100 and the right strap 110 to approach each other, when the left strap 100 and the right strap 110 are forced to be far away from each other, the left strap 100 and the right strap 110 drive the first gear 130 to rotate reversely, the first gear 130 drives the unidirectional locking member 230 to rotate reversely, at this time, the convex teeth 260 of the unidirectional locking member 230 are clamped and limited with the inner ratchet teeth 270 of the inner ratchet ring 250, and the convex teeth 260 and the inner ratchet teeth 270 cooperate to prevent the unidirectional locking member 230 from rotating, so that the first gear 130 cannot rotate, and thus the left strap 100 and the right strap 110 cannot be far away from each other.

Referring to fig. 3 and 4, in some specific embodiments, the elastic portion 240 has a clamping groove 340 on a radial outer side, and the knob 140 has a pin portion 350, where the pin portion 350 abuts against the clamping groove 340 along two circumferential sides of the rotation axis of the unidirectional locking member 230 to rotate the unidirectional locking member 230.

It can be appreciated that when the knob 140 is rotated, the pin portion 350 abuts against two sides of the slot 340 to rotate the unidirectional locking member 230.

Further, the clamping groove 340 has an inclined wall 360 at one side near the center of the unidirectional locking member 230, the inclined wall 360 is inclined along the radial direction of the rotation axis of the unidirectional locking member 230, and the pin portion 350 cooperates with the inclined wall 360 to drive the elastic portion 240 to deform along the direction near the center of the unidirectional locking member 230 so that the teeth 260 are separated from the inner ratchet teeth 270.

It can be appreciated that when the knob 140 rotates in one direction, the pin portion 350 abuts against one side of the clamping groove 340, so that the knob 140 can drive the unidirectional locking member 230 to rotate, when the knob 140 rotates in the other direction, the teeth 260 of the unidirectional locking member 230 abut against the inner ratchet teeth 270 of the inner ratchet ring 250, at this time, the knob 140 idles for a certain period, so that the pin portion 350 moves in the clamping groove 340, during the idling of the knob 140, the pin portion 350 presses the inclined wall 360, so that the elastic portion 240 deforms in a direction approaching to the center of the unidirectional locking member 230, and therefore, the teeth 260 of the elastic portion 240 are separated from the inner ratchet teeth 270 of the inner ratchet ring 250, so that the inner ratchet ring 250 no longer prevents the unidirectional locking member 230 from rotating, and further, the knob 140 can drive the unidirectional locking member 230 to rotate, so that the knob 140 can drive the left strap 100 and the right strap 110 away from each other.

Referring to fig. 5 and 6, in some specific embodiments, the unidirectional locking member 230 has a mounting ring 280, the first gear 130 has a mounting hole 290, the mounting hole 290 accommodates the mounting ring 280, an outer sidewall of the mounting ring 280 has a protrusion 300, a sidewall of the mounting hole 290 has a recess 310 accommodating the protrusion 300, and the protrusion 300 and the recess 310 are engaged and limited, so that the unidirectional locking member 230 can drive the first gear 130 to rotate through the limitation of the protrusion 300 and the recess 310, and further, slip between the unidirectional locking member 230 and the first gear 130 is avoided.

In some specific embodiments, the knob 140 has a mounting sleeve 320, the mounting sleeve 320 penetrates through the mounting ring 280 and the mounting hole 290, the mounting sleeve 320 can be deformed along the radial direction of the mounting sleeve 320, the knob 140 is further provided with a plug 330, and the plug 330 is used for being inserted into the mounting sleeve 320 to enable the outer wall of the mounting sleeve 320 to be attached to the first gear 130 and the unidirectional locking member 230, so that the knob 140 can be matched with the unidirectional locking member 230 and the first gear 130 through the mounting sleeve 320 in a pressing manner, and the matching of the knob 140, the unidirectional locking member 230 and the first gear 130 is more stable.

Further, the diameter of the latch 330 is tapered in a direction approaching the mounting sleeve 320, thereby facilitating insertion of the latch 330 into the mounting sleeve 320.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.

Claims

1. A helmet regulator, comprising:

the connecting mechanism comprises a left strap (100) and a right strap (110), wherein the left strap (100) and the right strap (110) are respectively connected with a lining of the helmet, and the left strap (100) and the right strap (110) are far away from each other and close to each other so as to adjust the tightness of the lining;

the adjusting mechanism comprises a shell (120), a first gear (130) rotatably connected with the shell (120) and a knob (140) for driving the first gear (130) to rotate, wherein the left strap (100) and the right strap (110) are both slidably connected with the shell (120), the left strap (100) is provided with a first rack part (150), the right strap (110) is provided with a second rack part (160), the first rack part (150) and the second rack part (160) are respectively meshed with the front side and the rear side of the first gear (130), and the first gear (130) rotates to drive the first rack part (150) and the second rack part (160) to mutually reversely move;

the left strap (100) is provided with a first groove (170) for accommodating the first gear (130), the length direction of the first groove (170) is along the length direction of the left strap (100), the first rack part (150) is arranged on one side of the first groove (170), the first groove (170) is in limit fit with the first gear (130), the right strap (110) is provided with a second groove (180) for accommodating the second rack part, the length direction of the second groove (180) is along the length direction of the right strap (110), the second rack part (160) is arranged on one side of the second groove (180), and the second groove (180) is in limit fit with the first gear (130).

2. The helmet regulator according to claim 1, wherein the housing (120) has a first limiting portion (190) and a second limiting portion (200), the first limiting portion (190) and the second limiting portion (200) are symmetrical along an axis of the first gear (130), the left strap (100) and the right strap (110) are accommodated between the first limiting portion (190) and the second limiting portion (200) to move, and the first limiting portion (190) and the second limiting portion (200) cooperate to limit the left strap (100) and the right strap (110) in front-back.

3. The helmet regulator according to claim 1, wherein the housing (120) has a bottom wall (210) and a top edge (220), the bottom wall (210) and the top edge (220) are configured to accommodate movement of the left strap (100) and the right strap (110), and the bottom wall (210) and the top edge (220) cooperate to limit the left strap (100) and the right strap (110) up and down.

4. The helmet regulator according to claim 1, characterized in that the regulating mechanism further comprises a unidirectional locking member (230), the unidirectional locking member (230) is located between a knob (140) and the first gear (130), the unidirectional locking member (230) is coaxially connected with the first gear (130), the knob (140) is used for driving the unidirectional locking member (230) to rotate, the unidirectional locking member (230) is provided with an elastic part (240), the elastic part (240) deforms along the radial direction of the rotation axis of the unidirectional locking member (230), the shell (120) is provided with an inner ratchet ring (250) for accommodating the unidirectional locking member (230), the outer circle of the elastic part (240) is provided with a convex tooth (260), the inner wall of the inner ratchet ring (250) is provided with an inner ratchet (270), the convex tooth (260) and the inner ratchet (270) cooperate to enable the unidirectional locking member (230) to rotate in one direction and lock the unidirectional locking member (230) in the other direction, and the left and right locking member (230) are driven by the left locking member (230) and the right locking band (100) to move away from each other.

5. The helmet regulator according to claim 4, wherein the one-way locking piece (230) has a mounting ring (280), the first gear (130) has a mounting hole (290), the mounting hole (290) accommodates the mounting ring (280), an outer sidewall of the mounting ring (280) has a protrusion (300), a sidewall of the mounting hole (290) has a recess (310) accommodating the protrusion (300), and the protrusion (300) and the recess (310) are cooperatively limited.

6. A helmet regulator according to claim 5, wherein the knob (140) has a mounting sleeve (320), the mounting sleeve (320) penetrating the mounting ring (280) and the mounting hole (290), the mounting sleeve (320) being deformable in a radial direction of the mounting sleeve (320), the knob (140) further being provided with a pin (330), the pin (330) being for inserting the mounting sleeve (320) to bring an outer wall of the mounting sleeve (320) into abutment with the first gear (130) and the unidirectional locking member (230).

7. A helmet regulator according to claim 6, wherein the diameter of the bolt (330) tapers in a direction approaching the mounting sleeve (320).

8. A helmet regulator according to claim 4, wherein the elastic portion (240) has a catching groove (340) on a radially outer side thereof, the knob (140) has a pin portion (350), and the pin portion (350) abuts against both circumferential sides of the catching groove (340) along the rotation axis of the one-way locking member (230) to rotate the one-way locking member (230).

9. A helmet regulator according to claim 8, wherein the clamping groove (340) has an inclined wall (360) on a side near the center of the unidirectional locking member (230), the inclined wall (360) is disposed obliquely along the radial direction of the rotation axis of the unidirectional locking member (230), and the pin portion (350) cooperates with the inclined wall (360) to drive the elastic portion (240) to deform in a direction near the center of the unidirectional locking member (230) so as to disengage the tooth (260) from the inner ratchet (270).