Headrest height adjustment mechanism and vehicle body

Abstract

The application discloses a headrest height adjusting mechanism, which comprises an operating member, a driving member, a safety lock structure and a locking member. The locking member is used for locking the height adjusting gear. The locking member has a locking position and a releasing position and can be switched between the locking position and the releasing position. The operating member has an initial position, a first operating position and a second operating position. The safety lock structure is used for locking the locking member in the locking position. The safety lock structure is movably arranged on the operating member. The safety lock is released from locking the locking member by the movement of the operating member from the initial position to the first operating position. One side of the driving member is slidably arranged on the operating member. The other side of the driving member is in abutment with the locking member. The driving member is pulled to move and the locking member is switched from the locking position to the releasing position by the movement of the operating member from the first operating position to the second operating position. The headrest height adjusting mechanism can prevent incorrect adjustment. The application further discloses a carrier body.

Description

[0001] This application is a divisional application of Chinese invention patent application filed on October 13, 2020, entitled "Headrest Height Adjustment Mechanism and Carrier Body", with the applicant being "Baoju Swiss AG" and application number 2020110935400. Technical Field

[0002] This invention relates to the field of infant and toddler products, and more particularly to a headrest height adjustment mechanism and a carrier body. Background Technology

[0003] With the continuous development of society, more and more families own cars, and children are traveling with their parents more often. Because children have weaker self-protection abilities, they often suffer greater injuries than adults in car accidents. In response, various child car seats have emerged on the market. These seats can be attached to regular car seats, providing both safety and comfort for children.

[0004] Generally, a child car seat includes a base and a carrier body detachably mounted on the base. The base connects to the car seat via an interface on its rear end using an ISOFIX (International Organization for Standardization) fastener. The carrier body has a height-adjustable headrest, which is adjusted to fit the infant's height, ensuring safety and comfort. The carrier body typically includes a headrest and a main body. The main body has a height adjustment position for the headrest, and correspondingly, the headrest has a locking mechanism that engages with the height adjustment position. The headrest can be adjusted up and down relative to the main body to achieve height adjustment. The locking mechanism engages with the height adjustment position to lock the headrest at the target height. Current headrest adjustment methods involve the user directly pulling or flipping the lever to unlock the locking mechanism in one step. However, this one-step unlocking method is prone to accidental unlocking, potentially causing the headrest to release unexpectedly, thus reducing safety and failing to meet current requirements.

[0005] Therefore, there is an urgent need for a headrest height adjustment mechanism and a vehicle body to overcome the above-mentioned defects. Summary of the Invention

[0006] One objective of this invention is to provide a headrest height adjustment mechanism that prevents incorrect adjustments, which has the advantages of high safety and ease of adjustment.

[0007] Another object of the present invention is to provide a vehicle body that prevents incorrect adjustment, which has the advantages of high safety and easy adjustment.

[0008] To achieve the above objectives, the headrest height adjustment mechanism provided by the present invention includes an operating component, a driving component, a safety lock structure, and a locking component. The locking component is used to lock with the height adjustment position and has a locked position and an unlocked position, which can be switched between the locked position and the unlocked position. The operating component has an initial position, a first operating position, and a second operating position. The safety lock structure is used to lock the locking component in the locked position. The safety lock structure is movably disposed on the operating component. The movement of the operating component from the initial position to the first operating position drives the safety lock to release the locking component. One side of the driving component is slidably disposed on the operating component, and the other side of the driving component abuts against the locking component. The movement of the operating component from the first operating position to the second operating position pulls the driving component to move and drives the locking component to switch from the locked position to the unlocked position.

[0009] Compared with existing technologies, the headrest height adjustment mechanism provided by this invention features a safety lock structure and an operating member with an initial position, a first operating position, and a second operating position. The safety lock structure locks the locking member in the locked position and is movably mounted on the operating member. The movement of the operating member from the initial position to the first operating position causes the safety lock to release the locking member, ensuring that the operating member can only perform subsequent unlocking operations when it moves to the first operating position. Simultaneously, one side of the driving member is slidably mounted on the operating member, and the other side abuts against the locking member. The movement of the operating member from the first operating position to the second operating position pulls the driving member to move, which in turn moves the locking member from the locked position to the unlocked position, thus achieving the unlocking purpose. In other words, to adjust the headrest height, the safety lock structure must first be unlocked by the operating member before the locking member can be unlocked to achieve headrest height adjustment, thereby preventing accidental unlocking of the headrest. This two-step unlocking method effectively avoids the traditional phenomenon of erroneous unlocking, thus improving security. The headrest height adjustment mechanism of this invention also has the advantage of being easy to adjust.

[0010] Preferably, the operating element is movable and switches between an initial position, a first operating position, and a second operating position.

[0011] Preferably, the safety lock structure has a locked position and an unlocked position for locking the locking member in the locked position, and the safety lock structure is switched from the locked position to the unlocked position by the movement of the operating member from the initial position to the first operating position.

[0012] Specifically, the operating component has a drive hole, and the safety lock structure protrudes into the drive hole to form a slider. The slider slides in the drive hole and moves under the drive of the drive hole so that the safety lock structure switches from the locked position to the unlocked position.

[0013] Specifically, the drive hole includes a first guide hole and a second guide hole. The first guide hole is used to switch the safety lock structure from the locked position to the unlocked position, and the second guide hole is used to keep the safety lock structure in the unlocked position. The first guide hole and the second guide hole are connected in sequence and communicate with each other.

[0014] Specifically, the length direction of the first guide hole intersects with the movement direction of the operating member, and the length direction of the second guide hole is parallel to the movement direction of the operating member.

[0015] Specifically, the safety lock structure has a locking pin, and the locking element has a locking hole corresponding to the locking pin. When the safety lock structure is in the locked position, the locking pin engages with the locking hole, and when the safety lock structure is in the unlocked position, the locking pin disengages from the locking hole.

[0016] Specifically, the safety lock structure also includes a safety lock body and a first elastic element built into the safety lock body. The slider is located on the side of the safety lock body closer to the operating element, and the locking pin is elastically connected to the safety lock body through the first elastic element.

[0017] Preferably, the operating member has a clearance hole, and the driving member has a pull member inserted into the clearance hole. When the operating member moves between the initial position and the first operating position, the pull member slides in the clearance hole. By the movement of the operating member from the first operating position to the second operating position, the pull member moves under the limiting action of the clearance hole and is linked to the locking member to switch from the locked position to the unlocked position.

[0018] Specifically, the pull component is a insert, and the clearance hole is an elongated hole that mates with the insert.

[0019] Preferably, the headrest height adjustment mechanism further includes a second elastic element that provides an elastic force that keeps the operating element in its initial position.

[0020] Preferably, the locking element rotates between a locked position and an unlocked position, and the locking element rotates under the push of the driving element.

[0021] Specifically, the locking element includes a locking element body and a locking lever for locking with the height adjustment position. The upper part of the locking element body has a pivot part for pivoting, the middle part of the locking element body has a push part that cooperates with the drive element, and the locking lever is located at the lower part of the locking element body.

[0022] Specifically, the driving member has a pushing part corresponding to the pushing part, and the pushing part rotates under the push of the driving member by moving the driving member.

[0023] Specifically, the propulsion part is the propulsion ramp.

[0024] Specifically, the locking element also includes a third elastic element that provides an elastic force that keeps the locking lever in the locked position.

[0025] To achieve the above objectives, the present invention provides a vehicle body, which includes a vehicle body and a headrest movably disposed on the vehicle body. The vehicle body also includes the aforementioned headrest height adjustment mechanism. The vehicle body has a height adjustment position for adjusting the height of the headrest. A locking member is pivotally connected to the headrest and one end of the locking member is rotatable and detachably engaged with the height adjustment position. Both the operating member and the driving member are slidably disposed on the headrest.

[0026] Preferably, both the operating component and the driving component slide along the vertical direction of the headrest.

[0027] Preferably, the vehicle body has a backrest, a headrest is movably disposed on the backrest, and a height adjustment position is disposed on the backrest. The headrest can be adjusted relative to the backrest by means of the cooperation between the height adjustment mechanism and the height adjustment position.

[0028] Specifically, the height adjustment position consists of multiple engagement slots on the back, which are spaced apart along the vertical direction of the vehicle body. The locking element in the locked position selectively engages with any one of the engagement slots.

[0029] Preferably, the headrest has a fixed cover plate located between the locking member and the vehicle body, and the locking member is rotatably disposed on the fixed cover plate. Attached Figure Description

[0030] Figure 1 This is a three-dimensional structural diagram of the vehicle body of the present invention.

[0031] Figure 2 This is a schematic diagram of the internal structure of the vehicle body of the present invention.

[0032] Figure 3 This is a schematic diagram of the internal structure of the vehicle body of the present invention after longitudinal sectioning.

[0033] Figure 4 This is a state diagram of the vehicle body and the operating component of the present invention when they move from the initial position to the first operating position.

[0034] Figure 5 yes Figure 4 A magnified view of a portion of point A in the middle.

[0035] Figure 6 This is a state diagram of the vehicle body of the present invention when the operating member is in the second operating position.

[0036] Figure 7 yes Figure 6 A magnified view of a section at point B in the middle. Detailed Implementation

[0037] To illustrate the technical content, structural features, and effects of the present invention in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0038] Please see Figures 1 to 5 The present invention provides a vehicle body 100, which includes a vehicle body 20, a headrest 30, and a headrest height adjustment mechanism 10. The headrest 30 is movably disposed on the vehicle body 20, so that the headrest 30 can be selectively adjusted vertically relative to the vehicle body 20. The headrest height adjustment mechanism 10 is located between the headrest 30 and the vehicle body 20, and is installed on the headrest 30. The headrest height adjustment mechanism 10 slides up and down with the headrest 30. The headrest height adjustment mechanism 10 includes an operating component 1 and a driving component 1. 2. Safety lock structure; 3. Locking element; 4. Second elastic element; 5. The vehicle body 20 has a height adjustment position 201 for the headrest 30 to adjust its height vertically. The locking element 4 is used to lock with the height adjustment position 201. The locking element 4 is pivotally connected to the headrest 30, and one end of the locking element 4 is rotatable and movable to engage with the height adjustment position 201. The locking element 4 has a locked position and an unlocked position, and the locking element 4 can switch between the locked position and the unlocked position. When the locking element 4 is in the locked position, it is engaged with the height adjustment position 201 (state as shown). Figure 3(As shown), the locking member 4 in the unlocked position is disengaged from the height adjustment position 201. The operating member 1 is located on the upper part of the headrest 30 and slides on the headrest 30. The operating member 1 has an initial position, a first operating position, and a second operating position. The second elastic member 5 provides an elastic force that keeps the operating member 1 in the initial position. The second elastic member 5 is located between the headrest 30 and the operating member 1. The operating member 1 can move between the initial position, the first operating position, and the second operating position. By pulling upward, the operating member 1 can overcome the elastic force of the second elastic member 5 and move from the initial position to the first operating position and the second operating position sequentially, thereby facilitating operation. The safety lock structure 3 is used to lock the locking member 4 in the locked position. The safety lock structure 3 is movably disposed on the operating member 1. The movement of the operating member 1 from the initial position to the first operating position drives the safety lock to release the locking member 4, so that the operating member 1 can only be moved to the first operating position for subsequent operations to be performed. During the unlocking operation, the drive member 2 slides onto the headrest 30, with one side of the drive member 2 slidably disposed on the operating member 1, and the other side of the drive member 2 abutting against the locking member 4. In this embodiment, the upper end of the drive member 2 is slidably disposed on the operating member 1, and the lower end of the drive member 2 abuts against the locking member 4. By moving the operating member 1 from the first operating position to the second operating position, the drive member 2 is moved, which in turn moves the locking member 4 from the locked position to the unlocked position. This causes the locking member 4 to disengage from the height adjustment position 201, thus achieving the unlocking purpose. In other words, if the height of the headrest 30 needs to be adjusted, the safety lock structure 3 must first be unlocked by moving the operating member 1 from the initial position to the first operating position. Only then can the subsequent height adjustment of the headrest 30 be achieved by unlocking the engagement between the locking member 4 and the height adjustment position 201, thereby preventing accidental unlocking of the headrest 30. This two-step unlocking method effectively avoids the traditional phenomenon of accidental unlocking, thereby improving security. More specifically, as follows:

[0039] Please see Figures 4 to 7The safety lock structure 3 has a locked position and an unlocked position. The locked position is used to lock the locking member 4 in the locked position, and the unlocked position is used to release the locking member 4 so that the locking member 4 can move freely between the locked position and the unlocked position. The safety lock structure 3 is switched from the locked position to the unlocked position by the operation member 1 switching from the initial position to the first operation position. Specifically, the operating component 1 has a drive hole 11, and the safety lock structure 3 protrudes into the drive hole 11 to form a slider 31. The slider 31 slides in the drive hole 11. The safety lock structure 3 has a locking pin 32, and the locking component 4 has a locking hole 41 corresponding to the locking pin 32. When the safety lock structure 3 is in the locked position, the locking pin 32 engages with the locking hole 41. When the safety lock structure 3 is in the unlocked position, the locking pin 32 disengages from the locking hole 41. During the process of the operating component 1 moving from the initial position to the first operating position, the upward movement of the operating component 1 causes the drive hole 11 to move upward. The slider 31 moves under the drive of the drive hole 11, so that the safety lock structure 3 switches from the locked position to the unlocked position. That is, the locking pin 32 engages with the locking hole 41 and then disengages from the locking hole 41, thereby achieving the purpose of allowing the locking component 4 to rotate freely.

[0040] Please see Figures 1 to 7 The drive hole 11 includes a first guide hole 111 and a second guide hole 112. The first guide hole 111 is used to switch the safety lock structure 3 from the locked position to the unlocked position, and the second guide hole 112 is used to keep the safety lock structure 3 in the unlocked position. The first guide hole 111 is located above the second guide hole 112. The first guide hole 111 and the second guide hole 112 are connected in sequence and communicate with each other. The arrangement of the first guide hole 111 and the second guide hole 112 allows the slider 31 to move left and right during the upward movement of the drive hole 11, thereby causing the locking pin 32 to disengage from the locking hole 41. Preferably, the length direction of the first guide hole 111 intersects with the movement direction of the operating member 1, and the length of the first guide hole 111 corresponds to the stroke of the operating member 1 from the initial position to the first operating position. The first guide hole 111 is inclined from the outside to the inside along the movement direction of the operating member 1. The length direction of the second guide hole 112 is parallel to the movement direction of the operating member 1, and the length of the second guide hole 112 corresponds to the stroke of the operating member 1 from the first operating position to the second operating position. This allows the locking pin 32 to move away from the locking hole 41 and remain in the unlocked state during the process of the operating member 1 switching from the initial position to the second operating position, thereby achieving the purpose of unlocking.

[0041] Please see Figures 4 to 5The safety lock structure 3 also includes a safety lock body 33 and a first elastic element 34. The safety lock structure 3 has a mounting cavity (not shown). The first elastic element 34 is housed within the safety lock body 33 through the mounting cavity. A slider 31 is located on the outer side of the safety lock body 33, near the operating member 1. The locking pin 32 is elastically connected to the safety lock body 33 through the first elastic element 34. The first elastic element 34 allows the locking pin 32 to elastically extend and retract. Therefore, during the engagement of the locking pin 32 with the locking hole 41, not only is good engagement achieved with high locking accuracy, but also hard impacts on the locking pin 32 are reduced, thereby protecting the locking pin 32 and reducing the need for component replacement. In this embodiment, two drive holes 11 are provided, symmetrically arranged along the left-right direction of the operating member 1. Correspondingly, the safety lock structure 3 also has two symmetrically arranged holes. Of course, manufacturers can adjust this according to actual needs, but are not limited to this.

[0042] Please see Figures 4 to 7 The operating component 1 has a clearance hole 12, and the driving component 2 has a pull member 21 inserted into the clearance hole 12. When the operating component 1 moves between the initial position and the first operating position, the pull member 21 slides within the clearance hole 12. In other words, during the process of the operating component 1 moving from the initial position to the first operating position, the movement of the operating component 1 will not cause the driving component 2 to move due to the clearance effect of the clearance hole 12, that is, the driving component 2 remains stationary. This ensures that the lock can only be released by driving the driving component 2 after the operating component 1 moves to the first operating position, in order to cooperate with the locking effect of the safety lock structure 3. The movement of the operating component 1 from the first operating position to the second operating position causes the pull member 21 to move under the limiting effect of the clearance hole 12 and cause the locking component 4 to switch from the locked position to the unlocked position, thereby realizing the release between the locking component 4 and the height adjustment position 201. Preferably, the pull member 21 is an insert, and the clearance hole 12 is an elongated hole that mates with the insert, but it is not limited to this.

[0043] Please see Figures 3 to 5The headrest 30 has a fixed cover plate 301, which is located between the locking member 4 and the carrier body 20. The locking member 4 is rotatably disposed on the fixed cover plate 301 and can rotate between a locked position and an unlocked position. The locking member 4 rotates under the push of the driving member 2. Specifically, the locking member 4 includes a locking member body 42, a third elastic member 44, and a locking lever 43 for locking with the height adjustment position 201. The third elastic member 44 provides an elastic force that keeps the locking lever 43 in the locked position. The third elastic member 44 is disposed between the fixed cover plate 301 and the locking member body 42. The upper part of the locking member body 42 has a pivot part 421 for pivoting, which is pivotally connected to the fixed cover plate 301. The middle part of the locking member body 42 has a push part 4 that cooperates with the driving member 2. 22. The locking lever 43 is located at the lower part of the locking body 42. The driving member 2 is provided with a pushing part 22 corresponding to the pushing part 422. Both the operating member 1 and the driving member 2 slide along the vertical direction of the headrest 30. The movement of the driving member 2 causes the pushing part 422 to rotate under the pushing of the pushing part 22, thereby allowing the locking member 4 to switch between the locked position and the unlocked position under the pushing of the driving member 2. Preferably, the pushing part 22 is a pushing inclined surface, and the cooperation between the pushing inclined surface and the pushing part 422 realizes the movement of the locking member 4. In this embodiment, the driving member 2 is a U-shaped plate structure. The pulling member 21 is located in the middle of the driving member 2. There are two pushing parts 22, and the pushing parts 22 are located at both ends of the driving member 2. Correspondingly, there are two locking members 4, which are symmetrically arranged.

[0044] Please see Figures 1 to 5 The vehicle body 20 has a backrest 202, a headrest 30 movably disposed on the backrest 202, and a height adjustment position 201 disposed on the backrest 202. The headrest 30 can be height-adjusted relative to the backrest 202 by the cooperation of the headrest height adjustment mechanism 10 and the height adjustment position 201. The height adjustment position 201 consists of multiple engaging slots formed in the backrest 202, which are spaced apart along the vertical direction of the vehicle body 100. The locking member 4, in the locked position, selectively engages with any of the engaging slots to achieve locking. In this embodiment, the backrest 202 is fixedly disposed; however, in other embodiments, the backrest 202 can move along the vertical direction of the vehicle body 100, so it is not limited to this.

[0045] Combined with appendix Figures 1 to 7 The working principle of the vehicle body 100 of the present invention will be described in detail below:

[0046] When the headrest 30 needs to be adjusted in height relative to the main body 20, the operating component 1, which is in the initial position, is pulled upwards. The operating component 1 overcomes the elastic force of the second elastic component 5 and slides upwards from the initial position to the first operating position (sliding state as follows). Figures 4 to 5As shown), the driving member 2 remains stationary, the pulling member 21 slides within the clearance hole 12, and the pulling member 21 slides from the upper end of the clearance hole 12 to the lower end of the clearance hole 12. At the same time, the upward movement of the operating member 1 causes the driving hole 11 to move upward, and the slider 31 moves under the drive of the first guide hole 111 of the driving hole 11, so that the safety lock structure 3 switches from the locked position to the unlocked position, that is, the locking pin 32 engages with the locking hole 41 and switches to the locking pin 32 disengaging from the locking hole 41. At this time, the safety lock structure 3 releases the locking member 4, and the locking member 4 can pivot freely between the locked position and the unlocked position.

[0047] Continue pulling upwards on the operating component 1, which is in the first operating position. The operating component 1 overcomes the elastic force of the second elastic component 5 and slides from the first operating position to the second operating position (as shown in the image). Figures 6 to 7 As shown, the slider 31 moves under the drive of the second guide hole 112 of the drive hole 11, so that the safety lock structure 3 is kept in the unlocked position. At the same time, the drive hole 11 continues to rise, and the pull member 21 moves upward under the limiting action of the avoidance hole 12. During the upward movement of the drive member 2, the push part 422 of the locking member 4 rotates against the elastic force of the third elastic member 44 under the push of the push part 22 of the drive member 2. The locking member 4 switches from the locked position to the unlocked position. The locking rod 43 of the locking member 4 disengages from the engagement with the height adjustment position 201. The headrest 30 can be freely adjusted up and down relative to the carrier body 20. When the headrest 30 moves to the target position, the operating member 1 is released. The operating member 1 resets under the elastic action of the second elastic member 5. The locking member 4 switches from the unlocked position to the locked position. The locking rod 43 of the locking member 4 engages with the height adjustment position 201 to lock the headrest 30 in the target position.

[0048] Because the headrest height adjustment mechanism 10 provided by the present invention is equipped with a safety lock structure 3 and the operating member 1 has an initial position, a first operating position and a second operating position, the safety lock structure 3 is used to lock the locking member 4 in the locked position. The safety lock structure 3 is movably disposed on the operating member 1. The movement of the operating member 1 from the initial position to the first operating position drives the safety lock to release the locking member 4, so that the operating member 1 can only perform subsequent unlocking operations when it moves to the first operating position. At the same time, one side of the driving member 2 is slidably disposed on the operating member 1, and the other side of the driving member 2 abuts against the locking member 4. The movement of the operating member 1 from the first operating position to the second operating position pulls the driving member 2 to move and drives the locking member 4 to switch from the locked position to the unlocked position, thereby achieving the purpose of unlocking. In other words, if the headrest 30 needs to be adjusted in height, the safety lock structure 3 must be unlocked by the operating member 1 first, and then the locking member 4 can be unlocked to achieve the headrest 30 height adjustment, thereby avoiding accidental unlocking of the headrest 30. The two-step unlocking method can effectively avoid the phenomenon of erroneous unlocking in the traditional way, thereby improving security. The headrest height adjustment mechanism 10 of the present invention also has the advantage of being easy to adjust.

[0049] The above-disclosed examples are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention shall still fall within the scope of the present invention.

Claims

1. A headrest height adjustment mechanism, mounted on a headrest to adjust the height of the headrest relative to the vehicle body, characterized in that, The headrest height adjustment mechanism includes: The locking element is configured to have a locked position and an unlocked position, wherein in the locked position the headrest is fixed relative to the vehicle body, and in the unlocked position the headrest is adjustable in height relative to the vehicle body. A safety lock structure is configured to have a locked position and an unlocked position. In the locked position, the safety lock structure locks the locking member in the locked position, and in the unlocked position, the safety lock structure releases the locking member from the locked position. A drive element, configured to drive the locking element from the locked position to the unlocked position when the safety lock structure is in the unlocked position; and An operating element is configured to have an initial position, a first operating position, and a second operating position. When the operating element is in the initial position, the safety lock structure is in the locked position, and the locking element is in the locked position. When the operating element moves from the initial position to the first operating position, the safety lock structure switches from the locked position to the unlocked position, and the driving element does not drive the locking element, which remains in the locked position. When the operating element moves from the first operating position to the second operating position, the driving element moves to drive the locking element to switch from the locked position to the unlocked position, while the safety lock structure remains in the unlocked position.

2. The headrest height adjustment mechanism according to claim 1, characterized in that, The operating component is slidably connected to the driving component, wherein when the operating component moves from the initial position to the first operating position, the operating component slides relative to the driving component, and when the operating component moves from the first operating position to the second operating position, the operating component pulls the driving component.

3. The headrest height adjustment mechanism according to claim 2, characterized in that, The operating member has a clearance hole, and the driving member has a pull member inserted into the clearance hole. When the operating member moves between the initial position and the first operating position, the pull member slides in the clearance hole. The operation of the operating member from the first operating position to the second operating position causes the pull member to be pulled by the operating member under the limiting action of the clearance hole.

4. The headrest height adjustment mechanism according to claim 3, characterized in that, The pulling member is an insert, and the clearance hole is an elongated hole that mates with the insert.

5. The headrest height adjustment mechanism according to claim 4, characterized in that, The length direction of the elongated hole is the same as the direction of movement of the operating component.

6. The headrest height adjustment mechanism according to claim 1, characterized in that, The driving member abuts against the locking member, wherein when the operating member moves from the initial position to the first operating position, the driving member is fixed relative to the locking member.

7. The headrest height adjustment mechanism according to claim 1, characterized in that, The locking member rotates between the locked position and the unlocked position. When the operating member moves from the first operating position to the second operating position, the locking member rotates under the push of the driving member.

8. The headrest height adjustment mechanism according to claim 1, characterized in that, The locking element includes a locking element body and a locking lever for locking with a height adjustment position on the vehicle body. The upper part of the locking element body has a pivot part that pivotally connects with the head rest, the middle part of the locking element body has a push part that cooperates with the drive member, and the locking lever is located at the lower part of the locking element body.

9. The headrest height adjustment mechanism according to claim 8, characterized in that, The driving member is provided with a pushing part corresponding to the pushing part, and the pushing part is rotated by the pushing part when the driving member moves.

10. The headrest height adjustment mechanism according to claim 1, characterized in that, The driving member abuts against the locking member, wherein the driving member remains stationary when the operating member moves from the initial position to the first operating position.

11. The headrest height adjustment mechanism according to claim 9, characterized in that, The pushing part is a pushing inclined surface.

12. The headrest height adjustment mechanism according to claim 1, characterized in that, The locking element further includes a third elastic element that provides an elastic force that keeps the locking element in the locked position.

13. The headrest height adjustment mechanism according to claim 1, characterized in that, The operating component is slidably connected to the safety lock structure. When the operating component moves from the initial position to the first operating position, the operating component drives the safety lock structure to switch from the locked position to the unlocked position. When the operating component moves from the first operating position to the second operating position, the operating component holds the safety lock structure in the unlocked position.

14. The headrest height adjustment mechanism according to claim 13, characterized in that, The operating component has a drive hole, and the safety lock structure protrudes into the drive hole to form a slider. The slider slides in the drive hole. The drive hole includes a first guide hole and a second guide hole. The first guide hole is used to switch the safety lock structure from the locked position to the unlocked position when the operating component moves from the initial position to the first operating position. The second guide hole is used to keep the safety lock structure in the unlocked position when the operating component moves from the first operating position to the second operating position. The first guide hole and the second guide hole are sequentially connected and communicate with each other.

15. The headrest height adjustment mechanism according to claim 14, characterized in that, The length direction of the first guide hole intersects with the direction of movement of the operating member from the initial position to the first operating position, and the length direction of the second guide hole is parallel to the direction of movement of the operating member from the first operating position to the second operating position.

16. The headrest height adjustment mechanism according to claim 1, characterized in that, It also includes a second elastic element that provides an elastic force that holds the operating element in the initial position.

17. The headrest height adjustment mechanism according to claim 1, characterized in that, The safety lock structure is movably mounted on the operating member. The movement of the operating member from the initial position to the first operating position causes the safety lock structure to release the locking member from the locked position. The movement of the operating member from the first operating position to the second operating position pulls the driving member to move and causes the locking member to switch from the locked position to the unlocked position.

18. The headrest height adjustment mechanism according to claim 1, characterized in that, The safety lock structure has a locking pin, and the locking element has a locking hole corresponding to the locking pin. When the safety lock structure is in the locked position, the locking pin engages with the locking hole. When the safety lock structure is in the unlocked position, the locking pin disengages from the locking hole.

19. The headrest height adjustment mechanism according to claim 18, characterized in that, The locking member has a pivot portion that is pivotally connected to the head, and the locking member is rotatably switched between the locked position and the unlocked position. The locking hole is spaced apart from the pivot portion.

20. The headrest height adjustment mechanism according to claim 18, characterized in that, The safety lock structure also includes a safety lock body and a first elastic element built into the safety lock body, and the locking pin is elastically connected to the safety lock body through the first elastic element.

21. The headrest height adjustment mechanism according to claim 1, characterized in that, The drive element is connected between the operating element and the locking element and is configured to be actuated by the operating element when the safety lock structure is in the unlocked position, so that the locking element switches between the locked position and the unlocked position.

22. The headrest height adjustment mechanism according to claim 21, characterized in that, One side of the drive member is slidably disposed on the operating member, and the other side of the drive member abuts against the locking member.

23. The headrest height adjustment mechanism according to any one of claims 1 to 22, characterized in that, The operating member is slidably disposed relative to the headrest and has the initial position, the first operating position, and the second operating position relative to the headrest; and / or both the operating member and the driving member slide along the vertical direction of the headrest.

24. The headrest height adjustment mechanism according to any one of claims 1 to 22, characterized in that, The direction in which the operating component moves from the initial position to the first operating position is the same as the direction in which the operating component moves from the first operating position to the second operating position.

25. A vehicle body, comprising a vehicle body and a headrest movably disposed on the vehicle body, characterized in that, The vehicle body further includes a headrest height adjustment mechanism as described in any one of claims 1 to 24, the vehicle body having a height adjustment position for adjusting the headrest vertically, and the locking member being pivotally connected to the headrest and having one end of the locking member detachably engaged with the height adjustment position.

26. The vehicle body according to claim 25, characterized in that, The vehicle body has a backrest, the headrest is movably disposed on the backrest, and the height adjustment position is disposed on the backrest. The headrest can be adjusted in height relative to the backrest by means of the cooperation between the height adjustment mechanism and the height adjustment position.

27. The vehicle body according to claim 26, characterized in that, The height adjustment position is formed by multiple engagement slots on the back, and the multiple engagement slots are arranged at intervals along the vertical direction of the vehicle body. The locking member in the locking position selectively engages with any of the engagement slots.

28. The vehicle body according to claim 25, characterized in that, The headrest has a fixed cover plate located between the locking member and the vehicle body, and the locking member is pivotally connected to the fixed cover plate.

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