Headrest adjusting mechanism of automobile child safety seat

Abstract

A headrest adjusting mechanism of an automobile child safety seat comprises a gear adjusting unit connected with a headrest, and a gear locking block is arranged on the gear adjusting unit; the gear rail is connected with the chair back, and a gear hole is formed in the gear rail; the driving unit is movably connected to the headrest and is in driving connection with the gear adjusting unit; the gear adjusting device is characterized in that the two gear rails are symmetrically arranged, the two gear adjusting units are arranged in a matched mode, the driving unit comprises a force application section, two forked sections and two driving sections, a handle is formed at the upper end of the force application section, the upper ends of the two forked sections are connected to the lower end of the force application section, and the two driving sections are connected to the lower end of the force application section. And the two groups of gear adjusting units are respectively connected with the two driving sections. The two groups of gear adjusting units are respectively in driving connection with the two driving sections, so that the headrest is stressed more uniformly during adjustment; and the gear adjusting unit and the gear rail are symmetrically arranged, so that the phenomenon that the headrest deflects towards one side after the gear adjusting unit and the gear hole are unlocked is avoided.

Description

Technical Field

[0001] This utility model relates to the technical field of vehicle seats, specifically to a headrest adjustment mechanism for a car child safety seat. Background Technology

[0002] With the improvement of living standards, cars have become a means of transportation for many families. Children are often carried in cars. Because children are small, child safety seats are usually installed in the car seats to ensure their safety. As children grow older, their head position will gradually increase, and the height of the headrest of the child safety seat needs to be adjusted accordingly.

[0003] To address the aforementioned issues, existing technology includes a Chinese invention patent, ZL201810474210.2 (publication number CN108657033A), entitled "A Safety Seat with Adjustable Headrest," which discloses a headrest adjustment structure capable of adjusting the headrest to a suitable position. The headrest adjustment structure includes an unlocking component with a pull ring, a shift groove and through hole on the seat back, a mounting base fixedly connected to the headrest, a shift movable component elastically disposed within the mounting base, and a shift lever passing through the shift movable component. The lower end of the unlocking component has a deformation section that drives the shift movable component. By pulling the unlocking mechanism, the deformation section straightens and pops out the shift movable component and the shift lever. The unlocking component then drives the mounting base to slide up and down along the through hole to the appropriate height before engaging the next shift groove, thereby achieving headrest height adjustment.

[0004] However, this type of patent has the following drawbacks: the headrest and the unlocking part are generally connected in only one place (corresponding to the mounting base of the above patent). When the weight on both sides of the connection part may not be strictly equal or the user lifts the headrest at an angle during the upward process, the headrest is prone to tilt to one side during the adjustment process, which will increase the friction between the connection part and the through hole or even cause them to jam, resulting in unstable movement and causing trouble for the user. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a headrest adjustment mechanism that prevents the headrest from tilting to one side and makes the movement more stable during the headrest height adjustment process, in light of the above-mentioned existing technology.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problem is as follows: the headrest adjustment mechanism of the car child safety seat is disposed between the backrest and the headrest of the car child safety seat for adjusting the relative position between the headrest and the backrest, and includes:

[0007] A gear adjustment unit is connected to the headrest, and the gear adjustment unit is provided with a movable gear locking block;

[0008] A gear shift rail is connected to the backrest. The gear shift rail has multiple gear shift holes for locking the gear shift locking block. These gear shift holes are spaced apart along the length of the backrest.

[0009] The drive unit is movably connected to the headrest and is driven to the gear adjustment unit. The gear locking block on the gear adjustment unit can be engaged into or disengaged from any gear hole on the gear rail under the control of the drive unit.

[0010] The feature is that: the gear rail is provided with two symmetrically arranged sets, and correspondingly, the gear adjustment unit is also provided with two sets. The drive unit includes a vertically arranged force-applying section, two inclined forked sections, and two vertically arranged drive sections. The upper end of the force-applying section forms a handle for applying external force. The upper ends of the two forked sections are connected to the lower end of the force-applying section. After the two forked sections are connected to the force-applying section, they form an inverted "Y" shape. The two drive sections are respectively connected to the lower ends of the two forked sections. The two sets of gear adjustment units are respectively driven and connected to the two drive sections. When external force is applied to the handle, the two forked sections and the two drive sections simultaneously drive the gear locking blocks on the two sets of gear adjustment units to move, so that the two sets of gear locking blocks can synchronously engage with or disengage from a corresponding gear hole on the two sets of gear rails, thereby realizing the locking or unlocking of the gear locking block and the gear hole, and changing the relative position of the headrest and the backrest.

[0011] To ensure the headrest remains upright during adjustment, the upper ends of the two forked sections and the lower ends of the force-applying section are connected to the headrest via a connector. The headrest has a vertically positioned limiting slot, and the connector is movably inserted through and fixed within this slot. This movable insertion restricts the lateral movement of the connector and the connected headrest, allowing the user to adjust the headrest height only vertically.

[0012] To ensure stable movement of the headrest on the gear shift rail, the gear shift rail further includes a smoothly surfaced slide rail portion and a gear shift portion connected to the slide rail portion. The gear shift portion, after connecting to the slide rail portion, forms an L-shape, and a gear shift hole is provided on the gear shift portion. The gear shift adjustment unit also includes a slider that can slide on the surface of the slide rail portion. The slider is fixedly connected to the headrest, and a first limiting groove is formed on the slider. The gear shift locking block is movable and limited within this first limiting groove. The cooperation between the slider and the slide rail portion allows the headrest to move stably along the surface of the slide rail portion.

[0013] To ensure accurate engagement of the gear shift locking block with the locking pin, a locking pin protrudes from one side of the gear shift locking block. The shape of the locking pin matches the shape of the gear shift hole. The first limiting groove has an opening facing the gear shift hole. The locking pin on the gear shift locking block can extend from this opening and engage with the gear shift hole, and can also disengage from the gear shift hole and retract into the first limiting groove through the opening. The first limiting groove and the opening restrict the movement trajectory of the gear shift locking block within the slider.

[0014] To prevent the slider from shifting away from the drive unit during adjustment, a second limiting groove is further provided on the slider, within which the drive section is movably and limited. A first sliding hole, parallel to the length direction of the gear rail, is provided on the drive section. A sliding pin is fixed within the second limiting groove, passing through the first sliding hole and sliding along it. The second limiting groove and the first sliding hole, parallel to the length direction of the gear rail, ensure that the drive section can only slide forward and backward along the rail, without any lateral shift.

[0015] To enable the drive unit to control the movement of the gear locking block, the gear locking block is further provided with oblique holes distributed at an inclination relative to the length direction of the gear rail. A protruding pin protrudes from the drive section, passing through and slidingly engaging with the oblique holes. During the upward or downward movement of the drive section, the protruding pin slides along the oblique holes, driving the gear locking block to move within the first limiting groove. This allows the locking pin on the gear locking block to extend from the opening of the first limiting groove and engage with the gear hole, and also to disengage from the gear hole and retract from the opening into the first limiting groove. The sliding engagement of the protruding pin and the oblique holes enables the gear adjustment unit to drive the gear locking block, converting the movement of the drive section along the surface of the slide rail into the movement of the gear locking block at the opening.

[0016] To prevent the slider from detaching from the slide rail, the slide rail is further provided with limiting stops at both ends in the length direction to prevent the slider from sliding out of the slide rail.

[0017] To facilitate user adjustment of the headrest to another position, a return spring is further provided between the force application section and the headrest. This return spring is distributed along the length of the gear shift rail and has a tendency to stretch. When the handle is lifted, the return spring is compressed, generating an elastic return force. When the external force on the handle is released, the entire drive unit moves downwards to reset under the elastic return force of the return spring. When the user lifts the handle, the gear shift locking block disengages from the gear shift hole, and the headrest moves upwards. After moving to a certain height, the user releases the handle, the return spring rebounds, pushing the drive section downwards and causing the gear shift locking block to re-engage into the gear shift hole.

[0018] In order for the drive unit to slide relative to the headrest, the back of the headrest is provided with a sliding groove with the same shape as the drive unit, and the drive unit is movably disposed in the sliding groove.

[0019] Furthermore, the upper part of the headrest has a through hole communicating with the sliding groove, and the handle is movably disposed in the through hole.

[0020] Compared with the prior art, the advantages of this utility model are as follows: the bifurcated design allows the drive unit to simultaneously drive two sets of gear adjustment units; the two sets of gear adjustment units are respectively driven and connected to the two drive segments, increasing the number of connection points between the headrest and the gear adjustment unit to two, making the force on the headrest more even during adjustment; and the symmetrically arranged gear adjustment unit gear rails ensure stable sliding of the headrest during height adjustment, avoiding the phenomenon of the headrest tilting to one side after the gear adjustment unit and gear hole are unlocked. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the headrest adjustment mechanism according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the headrest adjustment mechanism from another perspective according to an embodiment of the present utility model;

[0023] Figure 3 This is an exploded view of the headrest adjustment mechanism according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram showing the assembly relationship between the drive unit, the gear adjustment unit, and the gear rail in an embodiment of this utility model.

[0025] Figure 5 for Figure 4 A partially enlarged view of the cross-section along the AA direction;

[0026] Figure 6 This is a schematic diagram of the gear locking block according to an embodiment of the present utility model;

[0027] Figure 7 This is a schematic diagram of the slider structure according to an embodiment of the present utility model;

[0028] Figure 8 This is a schematic diagram of the structure of the drive unit according to an embodiment of the present utility model;

[0029] Figure 9 This is a schematic diagram showing the assembly relationship between the gear adjustment unit and the drive section in the locked state according to an embodiment of the present invention.

[0030] Figure 10 This is a schematic diagram showing the assembly relationship between the gear adjustment unit and the drive section in the unlocked state according to an embodiment of the present invention. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0032] like Figures 1-10 The diagram shows the preferred embodiment of this utility model. The headrest adjustment mechanism of this embodiment is used to adjust the height of the headrest on the back of a child safety seat to accommodate the head position of children of different ages. Traditional headrest adjustment mechanisms typically have only one connection point with the headrest, which can cause the headrest to tilt to one side during adjustment, causing inconvenience to the operator. Therefore, it would be beneficial to provide a headrest adjustment mechanism that prevents the headrest from tilting to one side and provides more stable movement during height adjustment. The structure of this headrest adjustment mechanism will be described in detail below:

[0033] See Figures 1 to 5 The headrest adjustment mechanism of the car child safety seat in this embodiment is located between the seat back and the headrest 1 for adjusting the relative position between the headrest 1 and the seat back. It includes a gear adjustment unit 2, a gear rail 3, and a drive unit 4. The gear adjustment unit 2 is connected to the headrest 1 and has a movable gear locking block 21. The gear rail 3 is connected to the seat back and has multiple gear holes 311 for locking the gear locking block 21. These gear holes 311 are spaced apart along the length of the seat back. The drive unit 4 is movably connected to the headrest 1 and is driven by the gear adjustment unit 2. The gear locking block 21 on the gear adjustment unit 2 can engage with or disengage from any gear hole 311 on the gear rail 3 under the control of the drive unit 4. The gear rail 3 has two symmetrically arranged sets, and correspondingly, the gear adjustment unit 2 also has two sets. The drive unit 4 includes a vertically arranged force-applying section 41, two inclined bifurcated sections 42, and two vertically arranged drive sections 43. The upper end of the force-applying section 41 forms a handle 410 for applying external force. The upper ends of the two bifurcated sections 42 are connected to the lower ends of the force-applying section 41, forming an inverted "Y" shape. The two drive sections 43 are respectively connected to the lower ends of the two bifurcated sections 42. The two sets of gear adjustment units 2 are respectively connected to the two drive sections 43. The moving section 43 is driven and connected; when an external force is applied to the handle 410, the two forked sections 42 and the two driving sections 43 simultaneously drive the gear locking blocks 21 on the two sets of gear adjustment units 2 to move, so that the two sets of gear locking blocks 21 can synchronously engage with or disengage from the corresponding gear hole 311 on the two sets of gear rails 3, thereby locking or unlocking the gear locking block 21 and the gear hole 311, and changing the relative position of the headrest 1 and the chair back.

[0034] To further ensure that the headrest 1 does not tilt during user adjustment, the upper ends of the two forked sections 42 and the lower ends of the force-applying section 41 are connected to the headrest 1 via a connector 5. The headrest 1 has a vertically positioned limiting slot 12, and the connector 5 is movably inserted through and fixed within the limiting slot 12. The connector 5, movably inserted through the vertically positioned limiting slot 12, restricts the movement of the connector 5 and the connected headrest 1 to the sides, allowing the user to adjust the height of the headrest 1 only in the vertical direction. The connector 5 is located between the force-applying section 41 and the forked section 42 of the drive unit 4.

[0035] See Figure 3 The gear shift rail 3 includes a smooth-surfaced slide rail portion 32 and a gear shift portion 31 connected to the slide rail portion 32. The gear shift portion 31 is L-shaped after being connected to the slide rail portion 32, and a gear shift hole 311 is provided on the gear shift portion 31. The gear shift adjustment unit 2 also includes a slider 22 that can slide on the surface of the slide rail portion 32. The slider 22 is fixedly connected to the headrest 1, and a first limiting groove 221 is opened on the slider 22. The gear shift locking block 21 is movable and limited within the first limiting groove 221. The cooperation between the slider 22 and the slide rail portion 32 allows the headrest 1 to move stably along the surface of the slide rail portion 32, thereby allowing the headrest 1 to move stably on the gear shift rail 3.

[0036] See Figures 5 to 7 A locking pin 211 protrudes from one side of the gear locking block 21. The shape of the locking pin 211 matches the shape of the gear hole 311. The first limiting groove 221 has an opening 2211 facing the gear hole 311. The locking pin 211 on the gear locking block 21 can extend out of the opening 2211 and engage with the gear hole 311, and can also disengage from the gear hole 311 and retract into the first limiting groove 221 through the opening 2211. The first limiting groove 221 and the opening 2211 restrict the movement trajectory of the gear locking block 21 within the slider 22, so that the gear locking block 21 can accurately engage with the locking pin 211. The slider 22 also has a second limiting groove 222, within which the drive section 43 is movable and limited. The drive section 43 has a first sliding hole 431 distributed parallel to the length direction of the gear rail 3. A sliding pin 223 is fixed within the second limiting groove 222, passing through the first sliding hole 431 and sliding along it. The second limiting groove 222 and the first sliding hole 431, distributed parallel to the length direction of the gear rail 3, ensure that the drive section 43 can only slide back and forth along the slide rail 32, without lateral displacement, thus preventing the slider 22 from shifting from the drive unit 4 during adjustment.

[0037] To enable the drive unit 4 to control the movement of the gear locking block 21, the gear locking block 21 has oblique holes 212 that are inclined relative to the length direction of the gear rail 3. A protruding pin 432 protrudes from the drive section 43, passing through and slidingly engaging with the oblique hole 212. During the upward or downward movement of the drive section 43, the protruding pin 432 slides along the oblique hole 212, driving the gear locking block 21 to move within the first limiting groove 221. This allows the locking pin 211 on the gear locking block 21 to extend from the opening 2211 of the first limiting groove 221 and engage with the gear hole 311, and also to disengage from the gear hole 311 and retract from the opening 2211 back into the first limiting groove 221. The sliding engagement of the protruding pin 432 and the oblique hole 212 enables the drive unit 4 to transmit power to the gear locking block 21, converting the movement of the drive section 43 along the surface of the slide rail 32 into the movement of the gear locking block 21 at the opening.

[0038] See Figure 4 The slide rail 32 has two limiting stops 321 at its two ends in the length direction to prevent the slider 22 from sliding out of the slide rail 32, thus preventing the slider 22 from disengaging from the slide rail 32.

[0039] See Figure 2 and Figure 3 A return spring 6 is provided between the force application section 41 and the headrest 1. The return spring 6 is distributed along the length of the gear rail 3 and has a tendency to stretch. When the handle 410 is lifted by force, the return spring 6 is compressed to generate an elastic return force. When the external force on the handle 410 is released, the entire drive unit 4 moves downward and resets under the action of the elastic return force of the return spring 6. When the user lifts the handle 410, the gear locking block 21 disengages from the gear hole 311, and the headrest 1 moves upward. After moving to a certain height, the user releases the handle, and the return spring 6 rebounds and pushes the drive section 43 downward, causing the gear locking block 21 to re-engage into the gear hole 311, making it convenient for the user to adjust the headrest 1 to another gear.

[0040] Finally, see Figure 1 The back of the headrest 1 is provided with a sliding groove 11 of the same shape as the drive unit 4. The drive unit 4 is movably disposed within the sliding groove 11, allowing the drive unit 4 to slide relative to the headrest 1. (See attached image) Figure 1 and Figure 2 The headrest 1 has a perforation 111 at the top that communicates with the sliding groove 11, and the handle 410 is movably disposed in the perforation 111.

[0041] The working principle of the headrest adjustment mechanism in this embodiment is as follows: (See...) Figure 5 and Figure 9 In the unadjusted state, the locking pin 211 of the gear locking block 21 engages with the gear hole 311, and the headrest 1 is limited to a certain height on the backrest.

[0042] When the user needs to change the height of the headrest 1, the user needs to pull up the handle 410. The handle 410 moves up along the inner wall of the through hole 111, and the connector 5 moves up within the limiting strip hole 12 to compress the return spring 6. (See attached image) Figure 10 The drive section 43 moves upward along the second limiting groove 222, the protruding pin 432 moves upward along the inclined hole 212, causing the gear locking block 21 to move inward along the first limiting groove 221, the locking pin 211 moves back into the opening 2211, and the locking pin 211 of the gear locking block 21 disengages from the gear hole 311; the user then applies force to the handle 410 and the headrest 1, causing the entire headrest 1 and drive unit 4 to move upward or downward, and the two sets of sliders 22 move along the surface of the slide rail portion 32 of the symmetrically arranged gear rail 3, and the number of connection points between the headrest 1 and the gear adjustment unit 2 With two sets of adjustment units, the force is more evenly distributed during headrest adjustment. The symmetrically distributed gear adjustment units 2 on both sides of the headrest's central axis ensure stable sliding of the headrest 1 during height adjustment, preventing the headrest 1 from tilting to one side after the gear adjustment unit 2 is unlocked from the gear hole 311. After the headrest 1 is moved to the appropriate height, the user releases the handle 410, the reset spring 6 pushes the drive unit 4 down, and the locking pin 211 of the gear locking block 211 re-engages into the gear hole 311, thus completing one gear adjustment action.

Claims

1. A headrest adjustment mechanism for a car child safety seat, disposed between the backrest and the headrest (1) of the car child safety seat for adjusting the relative position between the headrest (1) and the backrest, comprising: The gear adjustment unit (2) is connected to the headrest (1), and the gear adjustment unit (2) is provided with a movable gear locking block (21); The gear rail (3) is connected to the backrest. The gear rail (3) has multiple gear holes (311) for locking the gear locking block (21). These gear holes (311) are arranged at intervals along the length of the backrest. The drive unit (4) is movably connected to the headrest (1) and driven to the gear adjustment unit (2). The gear locking block (21) on the gear adjustment unit (2) can be engaged into any gear hole (311) on the gear rail (3) or disengaged from any gear hole (311) under the control of the drive unit (4). Its features are: The gear rail (3) is provided with two symmetrically arranged sets, and correspondingly, the gear adjustment unit (2) is also provided with two sets. The drive unit (4) includes a vertically arranged force application section (41), two inclined bifurcated sections (42), and two vertically arranged drive sections (43). The upper end of the force application section (41) forms a handle (410) for applying external force. The upper ends of the two bifurcated sections (42) are connected to the lower end of the force application section (41). The two bifurcated sections (42) and the force application section (41) are connected to form an inverted "Y" shaped structure. The two drive sections (43) are respectively connected to the two bifurcated sections (42). At the lower end of the handle (410), the two gear adjustment units (2) are connected to the two drive sections (43) respectively. When an external force is applied to the handle (410), the two forked sections (42) and the two drive sections (43) simultaneously drive the gear locking blocks (21) on the two gear adjustment units (2) to move, so that the two gear locking blocks (21) can be synchronously locked into or disengaged from the corresponding gear hole (311) on the two gear rails (3), thereby realizing the locking or unlocking of the gear locking block (21) and the gear hole (311), and changing the relative position of the headrest (1) and the backrest.

2. The headrest adjustment mechanism according to claim 1, characterized in that: The upper ends of the two bifurcated sections (42) and the lower ends of the force-applying section (41) are connected to the headrest (1) through a connector (5). The headrest (1) is provided with a vertically arranged limiting strip hole (12). The connector (5) is movably inserted and fixed in the limiting strip hole (12).

3. The headrest adjustment mechanism according to claim 1 or 2, characterized in that, The gear rail (3) includes a smooth slide rail (32) and a gear part (31) connected to the slide rail (32). The gear part (31) is L-shaped after being connected to the slide rail (32). The gear hole (311) is provided on the gear part (31). The gear adjustment unit (2) also includes a slider (22) that can slide on the surface of the slide rail (32). The slider (22) is fixedly connected to the headrest (1). A first limiting groove (221) is opened on the slider (22). The gear locking block (21) is movable and limited in the first limiting groove (221).

4. The headrest adjustment mechanism according to claim 3, characterized in that: A locking pin (211) protrudes from one side of the gear locking block (21), and the shape of the locking pin (211) is adapted to the shape of the gear hole (311). The first limiting groove (221) has an opening (2211) in the direction of the gear hole (311). The locking pin (211) on the gear locking block (21) can extend out from the opening (2211) and be inserted into the gear hole (311), and can also disengage from the gear hole (311) and retract from the opening (2211) into the first limiting groove (221).

5. The headrest adjustment mechanism according to claim 3, characterized in that: The slider (22) is also provided with a second limiting groove (222), and the drive section (43) is movable and limited in the second limiting groove (222); the drive section (43) is provided with a first sliding hole (431) distributed parallel to the length direction of the gear rail (3), and a sliding pin (223) is fixed in the second limiting groove (222). The sliding pin (223) passes through the first sliding hole (431) and can slide along the first sliding hole (431).

6. The headrest adjustment mechanism according to claim 3, characterized in that: The gear locking block (21) has oblique holes (212) that are inclined relative to the length of the gear rail (3). The drive section (43) has a protruding pin (432) that passes through the oblique hole (212) and slides in cooperation with the oblique hole (212). During the upward or downward movement of the drive section (43), the protruding pin (432) slides along the oblique hole (212) and drives the gear locking block (21) to move in the first limiting groove (221). This allows the locking pin (211) on the gear locking block (21) to extend out from the opening (2211) of the first limiting groove (221) and engage with the gear hole (311), and also to disengage from the gear hole (311) and retract from the opening (2211) into the first limiting groove (221).

7. The headrest adjustment mechanism according to claim 3, characterized in that: The slide rail (32) is provided with limiting and abutting parts (321) at both ends in the length direction to prevent the slider (22) from sliding out of the slide rail (32).

8. The headrest adjustment mechanism according to claim 1 or 2, characterized in that: A return spring (6) is provided between the force application section (41) and the headrest (1). The return spring (6) is distributed along the length of the gear rail (3) and has a tendency to stretch and deform. After the handle (410) is lifted by force, the return spring (6) is compressed to generate an elastic return force. When the external force on the handle (410) is released, the entire drive unit (4) moves downward and resets under the action of the elastic return force of the return spring (6).

9. The headrest adjustment mechanism according to claim 1 or 2, characterized in that: The back of the headrest (1) is provided with a sliding groove (11) that has the same shape as the drive unit (4), and the drive unit (4) is movably disposed in the sliding groove (11).

10. The headrest adjustment mechanism according to claim 9, characterized in that: The headrest (1) has a through hole (111) at the top that communicates with the sliding groove (11), and the handle (410) is movably disposed in the through hole (111).

Images