Concentric angle adjuster for car seat and car seat thereof

Abstract

A concentric angle adjuster for a car seat and the car seat thereof belong to the technical field of car seat accessories. It includes an inner gear plate; a bushing with a central hole in the inner gear plate; a pair of wedge-shaped blocks disposed within the bushing cavity; a gear meshing with the inner gear plate, with a gear shaft head extending from the center of the left side of the gear, the inner walls of the pair of wedge-shaped blocks contacting the outer wall of the gear shaft head; a backrest moving plate located to the right of the gear; and a backrest moving plate control plate fixed to the right side of the inner gear plate. The key feature is that it also includes a cross-sliding coupling located between the gear and the opposing side of the backrest moving plate, with a set of cross-sliding coupling mating bosses formed on the right side of the gear, and a cross-sliding coupling receiving cavity formed on the left side of the backrest moving plate, the cross-sliding coupling being disposed within the cross-sliding coupling receiving cavity. Advantages: Improves the speed and ease of backrest angle adjustment, avoids problems such as jerking and noise during adjustment; isolates external dust and debris from intrusion.

Description

Technical Field

[0001] This utility model belongs to the technical field of automotive seat accessories, specifically relating to a concentric angle adjuster for automotive seats, and also to automotive seats. Background Technology

[0002] The aforementioned car seat concentric adjuster is suitable not only for adjusting the backrest angle of car seats, but also for adjusting the electric armrests or leg rests of the middle row seats. When used for the electric armrests or leg rests of the middle row seats, it is generally, but not absolutely, limited to manual operation.

[0003] As is known in the industry, seat back adjusters come in two types: concentric and eccentric. The former, when adjusting the seat back, does not rotate concentrically around a single point, but rather with an eccentric offset, resulting in a slight, non-circular translation. This eccentric rotation causes not only horizontal forward / backward displacement but also vertical displacement, leading to unpleasant sensations like "nodding" or "wobbling" in the car seat back. The latter, the concentric adjuster, surpasses the former in almost all key performance indicators. The rotation axes (centers) of the two adjusting units are strictly aligned on the same straight line, and the seat back rotates around this physically aligned axis, resulting in smoother adjustment and better tactile feedback (in manual adjustment).

[0004] A typical example of a concentric angle adjuster structure in existing technology is as follows: a gear is installed between a seat toothed plate (also called an "inner toothed plate" or "stationary plate") fixed to the seat seat in use and a seat back toothed plate (also called an "outer toothed plate" or "moving plate") fixed to the seat back in use. A cam is disposed in the gear hole of the gear, and a clearance elimination mechanism (also called a "wedge block") is provided between the outer wall of the cam and the inner wall of the gear center hole. In use, the cam is driven by a drive rod of a manual or electric structure system, which in turn drives the gear. Since the outer toothed ring of the gear meshes with both the toothed rings of the seat toothed plate and the toothed rings of the seat back toothed plate, the gear rotates around the toothed ring of the seat toothed plate while simultaneously driving the seat back toothed plate to move, thereby adjusting the seat back angle to the desired degree by the occupant.

[0005] The concentric angle adjuster described above, because the number of teeth on the gear and the gear ring of the chair back plate tends to be the same, cannot improve or reduce efficiency, i.e., it cannot change the transmission efficiency. As known from existing technology, increasing the number of teeth on the gear ring of the chair back plate slows down the rotational speed of the chair back plate, and correspondingly improves the adjustment accuracy, and vice versa. However, when the number of teeth on the gear ring of the chair back plate is particularly small or particularly large, the aforementioned gear cannot mesh stably with it. Therefore, the number of teeth on the gear ring of the chair back plate cannot be too small or too large; it needs to take into account the situation of the gear it meshes with. Otherwise, it is aimless and impractical.

[0006] Given the technical bottlenecks of the concentric angle adjuster structure described above, a structurally sound transition component, such as a cross-sliding coupling, could be installed between the gear (commonly referred to as the "external gear plate") and the backrest gear plate (also known as the "moving disc") (commonly referred to as the "guide plate"). This would allow the gear to drive the moving disc via the cross-sliding coupling, thus simplifying the structure of the backrest gear plate. Simply mate the cross-sliding coupling with the backrest gear plate (the side of the moving disc facing the gear), and the gear can drive the backrest gear plate via the cross-sliding coupling. Furthermore, due to the use of the cross-sliding coupling, a gear ring is no longer needed on the backrest gear plate, making it a truly gearless moving disc for changing the backrest angle; this moving disc could even be called a backrest fixed disc.

[0007] While using a cross-sliding coupling between the gear and the chair back gear plate simplifies the structure of the chair back gear plate (eliminating the need for a gear ring) and provides a modular, building-block effect, numerous simulation tests conducted by the applicant have shown that the cross-sliding coupling requires sliding in both the longitudinal and transverse directions (maintaining a sliding allowance) and must reliably engage with the gear; otherwise, it will cause passive movement or even fail to drive the chair back moving plate. Furthermore, it must maintain a sliding and detachable connection with the aforementioned chair back moving plate. However, these technical factors have not been addressed in any publicly available Chinese or foreign patent literature to date. The technical solution described below arose under these circumstances. Utility Model Content

[0008] The objective of this invention is to provide a car seat concentric angle adjuster that helps the gear meet the high-efficiency angle adjustment requirements of the seat back drive plate, avoids jerking and noise during adjustment, facilitates reliable engagement between the cross sliding coupling (as a transitional connector) and the gear without the need for additional independent tensioning components, thus preventing negative motion that could affect the drive of the seat back drive plate, and embodies good modularity, standardization, universality, and combinability, allowing for adaptability with minimal or no changes, while also demonstrating economy, efficiency, and flexibility.

[0009] Another objective of this invention is to provide a car seat that fully embodies the technical effects described in the car seat concentric adjuster.

[0010] The present invention achieves its objective as follows: a concentric angle adjuster for a car seat includes an inner gear plate fixed to the seat frame of the car seat in use; a bushing disposed within a central hole in the inner gear plate; a pair of wedge-shaped blocks disposed within the bushing cavity of the bushing; a gear meshing with the inner gear plate, and a hollow gear shaft extending from the center of the left side of the gear, the gear shaft extending through the bushing cavity to the left side of the bushing, the inner walls of the pair of wedge-shaped blocks contacting the outer wall of the gear shaft; and a backrest adjustment disc fixed to the backrest frame of the car seat in use, the backrest adjustment disc being located at the... The gear has a backrest drive plate control plate located on the right side of the backrest drive plate and fixed to the right side of the internal gear plate. The feature is that it further includes a cross-sliding coupling located between the gear and the opposing sides of the backrest drive plate. A set of cross-sliding coupling mating bosses are formed at intervals on the right side of the gear, and a cross-sliding coupling receiving cavity with the same shape as the cross-sliding coupling is formed on the left side of the backrest drive plate. The cross-sliding coupling mating bosses are inserted into the cross-sliding coupling, and the cross-sliding coupling is disposed within the cross-sliding coupling receiving cavity.

[0011] In a specific embodiment of this utility model, a cover is provided at the position corresponding to the left side of the internal gear plate, and a cover cavity is formed on the right side of the cover. A gear drive shaft is fixed in a horizontal cantilever state at the center of the cover cavity. A drive shaft hole is formed at the axial center of the gear drive shaft, extending from the left side of the cover to the right end face of the gear drive shaft. The gear drive shaft passes sequentially through the gear shaft head hole of the gear shaft head, the gear center hole of the gear, the cross sliding coupling center hole of the cross sliding coupling, and the chair back moving plate center hole of the chair back moving plate, extending to the right side of the chair back moving plate and being limited by a locking member. On the bottom wall of the cover cavity and extending to the right at the position corresponding to the bushing cavity, an arc-shaped insert is provided. The arc-shaped insert is embedded in the bushing cavity, and each end face of the arc-shaped insert is formed as a wedge-shaped block step. The ends of the pair of wedge-shaped blocks facing the arc-shaped insert are respectively aligned with and in contact with the wedge-shaped block steps.

[0012] In another specific embodiment of this utility model, a spring foot support cavity is formed on each of the opposite end faces of the pair of wedge blocks at corresponding positions. A spring is provided on the left side corresponding to the bushing. The middle part of the spring forms an annular shape and is disposed in a spring receiving cavity between the inner wall of the cover cavity and the outer wall of the arc-shaped insert. The two ends of the spring form a pair of spring feet that tend to close together and abut against the spring foot support cavity. The gear shaft head extends into the gear shaft head cavity between the outer wall of the gear drive shaft and the inner wall of the arc-shaped insert. The arc surfaces of the pair of wedge blocks are each C-shaped and contact the outer wall of the gear shaft head. The end face of the pair of wedge blocks away from the spring foot support cavity is formed as a wedge block support surface, which corresponds to and contacts the wedge block step.

[0013] In another specific embodiment of the present invention, an internal gear plate tooth ring cavity is formed on the right side of the internal gear plate, an internal gear plate tooth ring is formed on the cavity wall of the internal gear plate tooth ring cavity and around the circumference of the cavity wall, and an external tooth ring is formed on the rim of the gear and around the circumference of the rim, the external tooth ring meshing with the internal gear plate tooth ring.

[0014] In another specific embodiment of this utility model, the mating bosses of the cross sliding coupling include a pair of longitudinal bosses and a pair of transverse bosses. The pair of longitudinal bosses are 180° apart from each other in the circumferential direction around the right side of the gear, forming a face-to-face position. The pair of transverse bosses are 180° apart from each other in the circumferential direction around the right side of the gear, forming a face-to-face position. The longitudinal and transverse bosses are in an alternating position. A transverse boss sliding groove is formed at the upper and lower parts of the cross sliding coupling at corresponding positions. A longitudinal boss sliding groove is formed at the front and rear sides of the middle part of the cross sliding coupling at corresponding positions. The pair of longitudinal bosses slide in cooperation with the longitudinal boss sliding groove, and the pair of transverse bosses slide in cooperation with the transverse boss sliding groove. The transverse boss sliding grooves are interconnected.

[0015] In another specific embodiment of this utility model, a first sliding cavity I and a second sliding cavity II of the cross sliding coupling are formed in the cross sliding coupling receiving cavity of the chair back moving plate. The cross sliding coupling cooperates with both the first sliding cavity I and the second sliding cavity II of the cross sliding coupling.

[0016] In a further specific embodiment of this utility model, a locking member engaging part is formed at the right end of the gear drive shaft and at a position extending to the right side of the chair back moving plate through the center hole of the chair back moving plate. The locking member engages with the locking member engaging part. The locking member is a snap ring or a cotter pin. When the locking member is a snap ring, the locking member engaging part is a snap ring groove, and when the locking member is a cotter pin, the locking member engaging part is a cotter pin insertion hole.

[0017] In a further specific embodiment of the present invention, a backrest frame welding fixing flange for fixing the backrest moving plate to the backrest frame of the car seat is formed in the middle region on the right side of the seat back moving plate and at equal intervals around the circumference of the middle region. The backrest frame welding fixing flange is formed by transferring material formed by stamping and creating a pit in the cross sliding coupling receiving cavity to the right side of the seat back moving plate.

[0018] In another specific embodiment of this utility model, a central through hole is formed at the center of the backrest moving plate control plate. The middle area on the right side of the backrest moving plate, together with the backrest frame, is welded to the central through hole of the control plate. A backrest moving plate edge receiving cavity is formed on the left side of the backrest moving plate control plate and around the backrest moving plate control plate. The periphery of the backrest moving plate is matched with the backrest moving plate edge receiving cavity. The backrest moving plate control plate also has a welded flange edge, which is welded to the right side of the inner tooth plate. An inner tooth plate fixing hole is provided on the inner tooth plate for fixing the inner tooth plate to the seat frame.

[0019] Another objective of this invention is achieved by providing a car seat having the car seat concentric adjuster.

[0020] The advantages of the technical solution provided by this utility model are as follows: Because a cross-sliding coupling with a planetary gear or double gear effect is set between the gear and the backrest moving plate, the transmission efficiency is improved by changing the transmission speed ratio through the cross-sliding coupling, thereby significantly improving the speed and ease of backrest angle adjustment, and avoiding problems such as jerking and noise during adjustment; because a cross-sliding coupling mating boss is formed on the surface of the gear facing the backrest moving plate, and a cross-sliding coupling receiving cavity is formed on the side of the backrest moving plate facing the gear, there is no need to use additional independent components such as support columns, wedge blocks, or tensioning protrusions to reliably position the cross-sliding coupling between the gear and the opposite side of the backrest moving plate, which not only... It significantly reduces the number of parts, improves assembly efficiency, and ensures good concentricity, while also simplifying the structure of the seat back actuator. Because the seat back actuator's edges are protected by a control plate fixed to the right side of the inner gear plate, and the seat back actuator also protects the cross-sliding coupling and gears, it effectively isolates external dust and debris, preventing damage to transmission components. Due to its modular, building-block-like structure, it facilitates standardization, universality, and modularity, allowing for minimal or no changes to accommodate different usage scenarios, such as adjusting power armrests and leg rests in automobiles. It truly embodies economy, resource conservation, high efficiency, and flexibility. The provided car seat fully demonstrates the aforementioned technical effects of a car seat concentric adjuster. Attached Figure Description

[0021] Figure 1 This is an assembly structure diagram of the present invention; Figure 2 for Figure 1 A schematic diagram showing the left side of the chair back control panel; Figure 3 for Figure 1 A schematic diagram showing the assembly process and its practical application.

[0022] In the diagram: 1. Internal gear plate, 11. Central hole of internal gear plate, 111. Bushing, 1111. Bushing cavity, 12. Gear ring cavity of internal gear plate, 121. Gear ring of internal gear plate, 13. Fixing hole of internal gear plate; 2. Wedge block, 21. Spring foot support cavity, 22. Arc surface of wedge block, 23. Support surface of wedge block; 3. Gear, 31. Gear shaft head, 311. Gear shaft head hole, 32. Mating boss of cross sliding coupling, 321. Longitudinal boss, 322. Transverse boss, 33. Central hole of gear, 34. External gear ring; 4. Chair back moving plate, 41. Receiving cavity of cross sliding coupling, 411. First sliding cavity I of cross sliding coupling, 412. Second sliding cavity II of cross sliding coupling, 42. 43. Chair back moving plate center hole; 5. Chair back frame welding fixing flange; 6. Chair back moving plate control plate; 71. Control plate central through hole; 82. Chair back moving plate edge receiving cavity; 93. Welded flange edge; 10. Cross sliding coupling; 11. Cross sliding coupling center hole; 12. Coupling transverse boss sliding groove; 13. Coupling longitudinal boss sliding groove; 14. Cover; 15. Cover cavity; 16. Gear drive shaft; 17. Drive shaft hole; 18. Clamping element; 19. Clamping element mating part; 10. Arc-shaped insert; 10. Wedge-shaped block step; 11. Spring receiving cavity; 12. Gear shaft head cavity; 13. Spring; 14. Spring foot. Detailed Implementation

[0023] In order to better understand the technical essence and beneficial effects of this utility model, the applicant provides a detailed description below by way of embodiments. However, the description of the embodiments is not intended to limit the solution of this utility model. Any formal but not substantive equivalent transformations made based on the concept of this utility model should be considered within the scope of the technical solution of this utility model.

[0024] In the following description, all directional or positional concepts involving up, down, left, right, front, and back are based on the current position. Figure 1 The location and state are taken as a reference, and therefore should not be construed as a special limitation on the technical solution provided by this utility model.

[0025] Please see Figure 1The diagram shows an inner gear plate 1 fixed to the seat frame of a car seat in use; a bushing 111 is disposed within the central hole 11 of the inner gear plate 1; a pair of wedge-shaped blocks 2 are shown, disposed within the bushing cavity 1111 of the bushing 111; a gear 3 is shown, which meshes with the aforementioned inner gear plate 1, and a hollow gear shaft head 31 extends from the center of the left side of the gear 3, extending through the bushing cavity 1111 to the left side of the bushing 111 and engaging with the cover 7, which will be described in detail below. In conjunction, the inner walls of the aforementioned pair of wedge-shaped blocks 2 are in contact with the outer wall of the gear shaft head 31, that is, in contact with the outer wall of the portion of the gear shaft head 31 located within the bushing cavity 1111; a backrest moving plate 4 for fixing to the backrest frame of the car seat in the use state is shown, the backrest moving plate 4 being located to the right of the aforementioned gear 3; a backrest moving plate control plate 5 is shown, which can also be called a backrest moving plate limiting ring or backrest moving plate limiting ring, it being located to the right of the aforementioned backrest moving plate 4 and the backrest moving plate control plate 5 being fixed to the right side of the aforementioned inner gear plate 1.

[0026] The key technical points of the technical solution provided by this utility model are as follows: the structural system of the aforementioned car seat concentric angle adjuster also includes a cross sliding coupling 6 located between the aforementioned gear 3 and the aforementioned seat back moving plate 4 on opposite sides. A set of cross sliding coupling mating bosses 32 are formed at intervals on the right side of the aforementioned gear 3, and a cross sliding coupling receiving cavity 41 with the same shape as the cross sliding coupling 6 is formed on the left side of the aforementioned seat back moving plate 4. The cross sliding coupling mating bosses 32 are inserted and fitted with the cross sliding coupling 6, and the cross sliding coupling 6 is disposed in the cross sliding coupling receiving cavity 41.

[0027] The applicant should clarify that although the descriptions of the seat frame (such as the seat basin) and the backrest frame of the car seat in use are defined above before the inner tooth plate 1 and the backrest moving plate 4, it does not mean that the structure of this utility model is limited to the adjustment of the backrest angle of the car seat. For example, it can be used for the adjustment of the electric armrest and electric leg rest of the middle row seat of the car, thus confirming the relevant advantages described by the applicant in the above technical effect column.

[0028] A cover 7, as mentioned above, is provided on the left side corresponding to the aforementioned inner tooth plate 1. That is, the structural system of the concentric angle adjuster for automobile seats of this utility model also includes this cover 7. A cover cavity 71 is formed on the right side of the cover 7. A gear drive shaft 711 for driving the aforementioned gear 3 is fixed in a horizontal cantilevered state at the center of the cover cavity 71. A drive shaft hole 7111 is formed at the axial center of the gear drive shaft 711, extending from the left side of the cover 7 to the right end face of the gear drive shaft 711. The gear drive shaft 711 passes sequentially through the gear shaft head hole 311 of the gear shaft head 31, the gear... The gear center hole 33 of 3, the cross sliding coupling center hole 61 of the cross sliding coupling 6 and the backrest moving plate center hole 42 of the backrest moving plate 4 extend to the right side of the backrest moving plate 4 and are defined by the locking member 7112. On the bottom wall of the cover cavity 71 and at the position corresponding to the aforementioned bushing cavity 1111, there is an arc-shaped insert 712 extending to the right. The arc-shaped insert 712 is embedded in the bushing cavity 1111, and the two end faces of the arc-shaped insert 712 are each configured as a wedge-shaped block step 7121. The ends of the aforementioned pair of wedge-shaped blocks 2 facing the arc-shaped insert 712 are respectively corresponding to and in contact with the wedge-shaped block step 7121.

[0029] Depend on Figure 1 And by Figure 3 As can be seen from the diagram, the aforementioned drive shaft hole 7111 is a spline hole, but this does not mean that this hole shape is mandatory. For example, it can be a square hole, a regular hexagonal hole, or other similar shapes.

[0030] On the opposing end faces of the aforementioned pair of wedge-shaped blocks 2, and at corresponding positions, a spring foot support cavity 21 is formed. A spring 8 is provided on the left side corresponding to the aforementioned bushing 111. The middle part of the spring 8 is formed into a ring and is located in the spring receiving cavity 713 between the inner wall (i.e., the inner side wall of the cavity) of the aforementioned cover cavity 71 and the outer wall of the aforementioned arc-shaped insert 712. The two ends of the spring 8 form a pair of spring feet 81 that tend to close together. The pair of spring feet 81 abut against the aforementioned spring foot support cavity 21, thereby spreading the pair of wedge-shaped blocks 2 apart and making them wedge-shaped. The arc surface 22 (i.e., the "inner arc surface of the wedge block" has a good contact with the outer surface of the gear shaft head 31); the aforementioned gear shaft head 31 extends into the gear shaft head cavity 714 formed between the outer wall of the aforementioned gear drive shaft 711 and the inner wall of the arc-shaped insert 712; the arc surfaces 22 of the aforementioned pair of wedge blocks 2 are each C-shaped and contact the outer wall of the gear shaft head 31, and the end face of the pair of wedge blocks 2 away from the aforementioned spring foot support cavity 21 is formed as a wedge block support surface 23, which corresponds to and contacts the aforementioned wedge block step 7121.

[0031] Depend on Figure 1As shown, an internal gear plate tooth ring cavity 12 is formed on the right side of the aforementioned internal gear plate 1. An internal gear plate tooth ring 121 is formed on the cavity wall of the internal gear plate tooth ring cavity 12 and around the circumference of the cavity wall. An external tooth ring 34 is formed on the rim of the aforementioned gear 3 and around the circumference of the rim. The external tooth ring 34 meshes with the aforementioned internal gear plate tooth ring 121.

[0032] Please stay tuned. Figure 1 The aforementioned cross sliding coupling mating boss 32 includes a pair of longitudinal bosses 321 and a pair of transverse bosses 322. The pair of longitudinal bosses 321 are 180° apart from each other in the circumferential direction around the right side of the aforementioned gear 3, forming a face-to-face position. The pair of transverse bosses 322 are 180° apart from each other in the circumferential direction around the right side of the gear 3, forming a face-to-face position. The longitudinal and transverse bosses 321 and 322 form an alternate position. They are located on the upper and lower parts of the aforementioned cross sliding coupling 6 and are positioned relative to each other. Each corresponding position is provided with a transverse boss sliding groove 62 of the coupling, and a longitudinal boss sliding groove 63 of the coupling is provided at the front and rear sides of the middle part of the cross sliding coupling 6 at corresponding positions. The aforementioned pair of longitudinal bosses 321 are slidably engaged with the aforementioned pair of longitudinal boss sliding grooves 63 of the coupling, and the aforementioned pair of transverse bosses 322 are slidably engaged with the transverse boss sliding grooves 62 of the coupling. The aforementioned pair of transverse boss sliding grooves 62 of the coupling are connected through the aforementioned central hole 61 of the cross sliding coupling.

[0033] Please see Figure 2 The cross sliding coupling receiving cavity 41 of the aforementioned chair back moving plate 4 is provided with a first sliding cavity I 411 and a second sliding cavity II 412 of the cross sliding coupling. The aforementioned cross sliding coupling 6 cooperates with both the first sliding cavity I 411 and the second sliding cavity II 412 of the cross sliding coupling.

[0034] Still see Figure 1 At the right end of the aforementioned gear drive shaft 711, and at a position extending to the right side of the aforementioned backrest moving plate 4 after passing through the center hole 42, a locking member engaging part 7113 is formed. The aforementioned locking member 7112 engages with the locking member engaging part 7113. The locking member 7112 is a snap ring or a cotter pin. When the locking member 7112 is a snap ring, the aforementioned locking member engaging part 7113 is a snap ring groove, and when the locking member 7112 is a cotter pin, the aforementioned locking member engaging part 7113 is a cotter pin insertion hole. In this embodiment, the former is selected.

[0035] In the middle region on the right side of the aforementioned backrest moving plate 4 and at equal intervals around the circumference of the middle region, there is a backrest frame welding fixing flange 43 for fixing the backrest moving plate 4 to the backrest frame of the car seat. The backrest frame welding fixing flange 43 is formed by transferring material that has been stamped and formed into a pit in the cross sliding coupling receiving cavity 41 to the right side of the backrest moving plate 4.

[0036] Depend on Figure 1 As shown, a central through hole 51 is formed at the center of the aforementioned backrest moving plate control plate 5. The middle area on the right side of the aforementioned backrest moving plate 4, together with the aforementioned backrest frame welding fixing flange 43, corresponds to the aforementioned central through hole 51. On the left side of the backrest moving plate control plate 5 and around the backrest moving plate control plate 5, a backrest moving plate edge receiving cavity 52 is formed. The periphery of the backrest moving plate 4 cooperates with the backrest moving plate edge receiving cavity 52. ​​The backrest moving plate control plate 5 also has a welding flange edge 53, which is welded to the right side of the aforementioned inner tooth plate 1. An inner tooth plate fixing hole 13 is provided on the inner tooth plate 1 for fixing the inner tooth plate 1 to the seat frame.

[0037] This utility model also relates to a car seat having the aforementioned car seat concentric angle adjuster.

[0038] Please see Figure 3 And combined Figure 1 , Figure 3 for Figure 1The assembly is complete and ready for use. In use, the inner gear plate 1 is fixed to the seat frame (e.g., seat basin) with bolts at positions corresponding to a set of inner gear plate fixing holes 13. The backrest frame is welded and fixed with the welding flange 43. A power shaft, whose cross-sectional shape is adapted to the drive shaft hole 7111 by an electric drive mechanism (e.g., a motor drive mechanism) or a manual drive mechanism (e.g., a handle, or a manual rotary disc), is inserted into the drive shaft hole 7111, thus establishing a driving or transmission relationship between the gear drive shaft 711 and this invention. Under the action of the aforementioned electric or manual mechanism, the aforementioned power shaft causes the gear shaft head 31 to rotate, causing the outer gear ring 34 of the gear 3 to rotate around the inner gear plate gear ring 121. Since the pair of longitudinal bosses 321 and the pair of transverse bosses 322 on the right side of the gear 3 respectively engage with the pair of longitudinal boss sliding grooves 63 and the pair of transverse boss sliding grooves 62 of the cross sliding coupling 6, the rotation of the gear 3 drives the cross sliding coupling 6 to transmit power accordingly. Furthermore, since the cross-sliding coupling 6 engages with the first sliding cavity I 411 and the second sliding cavity II 412 of the cross-sliding coupling, which are respectively formed within the cross-sliding coupling receiving cavity 41, the cross-sliding coupling 6 drives the backrest moving plate 4 (also referred to as the "backrest fixed connecting plate," as described above), which in turn drives the backrest, causing it to tilt forward or backward. This forward or backward adjustment depends on the forward and reverse rotation of the motor in the aforementioned electric drive mechanism or the forward and reverse operation of the handle in the manual drive mechanism. Electric operation is typically achieved through control buttons, such as touch buttons or corresponding switches, located in appropriate positions on the car seat armrest. Manual operation is achieved through the operation of a handle or rotating disc. Since the transmission relationship during manual adjustment is similar to the electric mode or automatic mode of the electric drive mechanism, the applicant will not elaborate further.

[0039] In summary, the technical solution provided by this utility model makes up for the shortcomings of the prior art, successfully completes the utility model task, and faithfully realizes the technical effects described by the applicant in the above technical effect column.

Claims

1. A concentric angle adjuster for a car seat, comprising an inner gear plate (1) fixed to the seat frame of the car seat in use; a bushing (111) disposed in a central hole (11) of the inner gear plate (1); a pair of wedge blocks (2) disposed in the bushing cavity (1111) of the bushing (111); a gear (3) meshing with the inner gear plate (1), and a hollow gear shaft head (31) extending from the center of the left side of the gear (3). 31) Extending through the bushing cavity (1111) to the left side of the bushing (111), the inner walls of the pair of wedges (2) are in contact with the outer wall of the gear shaft head (31); a backrest moving plate (4) fixed to the backrest frame of the car seat in use, the backrest moving plate (4) being located to the right of the gear (3); a backrest moving plate control plate (5) being located to the right of the backrest moving plate (4) and the backrest moving plate control plate (5) being fixed to the right side of the inner gear plate (1); characterized in that: It also includes a cross sliding coupling (6) located between the gear (3) and the opposite side of the chair back moving plate (4). A set of cross sliding coupling mating bosses (32) are formed at intervals on the right side of the gear (3), and a cross sliding coupling receiving cavity (41) with the same shape as the cross sliding coupling (6) is formed on the left side of the chair back moving plate (4). The cross sliding coupling mating bosses (32) are inserted into the cross sliding coupling (6), and the cross sliding coupling (6) is disposed in the cross sliding coupling receiving cavity (41).

2. The car seat concentric angle adjuster according to claim 1, characterized in that: A cover (7) is provided on the left side corresponding to the internal gear plate (1). A cover cavity (71) is formed on the right side of the cover (7). A gear drive shaft (711) is fixed in a horizontal cantilever state at the center of the cover cavity (71). A drive shaft hole (7111) is formed in the axial center of the gear drive shaft (711), which extends from the left side of the cover (7) to the right end face of the gear drive shaft (711). The gear drive shaft (711) passes through the gear head hole (311) of the gear shaft head (31), the gear center hole (33) of the gear (3), and the cross sliding coupling (6) in sequence. The center hole (61) of the device and the center hole (42) of the backrest moving plate (4) extend to the right side of the backrest moving plate (4) and are defined by the locking member (7112). On the bottom wall of the cover cavity (71) and at the position corresponding to the bushing cavity (1111), there is an arc-shaped insert (712) extending to the right. The arc-shaped insert (712) is embedded in the bushing cavity (1111), and the two end faces of the arc-shaped insert (712) are each configured as a wedge-shaped block step (7121). The end of the pair of wedge-shaped blocks (2) facing the arc-shaped insert (712) is respectively opposite to and in contact with the wedge-shaped block step (7121).

3. The car seat concentric angle adjuster according to claim 2, characterized in that: On the opposing end faces of the pair of wedge-shaped blocks (2) and at corresponding positions, a spring foot support cavity (21) is formed. A spring (8) is provided on the left side corresponding to the bushing (111). The middle part of the spring (8) is formed into a ring and is disposed in a spring receiving cavity (713) between the inner wall of the cover cavity (71) and the outer wall of the arc-shaped insert (712). The two ends of the spring (8) form a pair of spring feet (81) that tend to close together. The pair of spring feet (81) abut against the spring foot support. On the cavity (21); the gear shaft head (31) extends into the gear shaft head cavity (714) between the outer wall of the gear drive shaft (711) and the inner wall of the arc-shaped insert (712); the arc-shaped surfaces (22) of the pair of wedge blocks (2) are each C-shaped and in contact with the outer wall of the gear shaft head (31), and the end face of the pair of wedge blocks (2) away from the spring foot support cavity (21) is formed as a wedge block support surface (23), which corresponds to and is in contact with the wedge block step (7121).

4. The car seat concentric angle adjuster according to claim 1, characterized in that: An internal gear plate cavity (12) is formed on the right side of the internal gear plate (1). An internal gear plate ring (121) is formed on the cavity wall of the internal gear plate cavity (12) and around the circumference of the cavity wall. An external gear ring (34) is formed on the rim of the gear (3) and around the circumference of the rim. The external gear ring (34) meshes with the internal gear plate ring (121).

5. A car seat concentric angle adjuster according to claim 1, characterized in that: The cross sliding coupling's mating boss (32) includes a pair of longitudinal bosses (321) and a pair of transverse bosses (322). The pair of longitudinal bosses (321) are positioned face-to-face, 180° apart, around the circumference of the right side of the gear (3). The pair of transverse bosses (322) are positioned face-to-face, 180° apart, around the circumference of the right side of the gear (3). The longitudinal bosses (321) and transverse bosses (322) are positioned alternately. The upper and lower parts of the coupling each have a transverse boss sliding groove (62) at corresponding positions. The middle front and rear sides of the cross sliding coupling (6) each have a longitudinal boss sliding groove (63) at corresponding positions. The pair of longitudinal bosses (321) are slidably engaged with the one longitudinal boss sliding groove (63), and the pair of transverse bosses (322) are slidably engaged with the transverse boss sliding groove (62). The pair of transverse boss sliding grooves (62) are interconnected.

6. The car seat concentric angle adjuster according to claim 1, characterized in that: The cross sliding coupling receiving cavity (41) of the chair back moving plate (4) is formed with a first sliding cavity I (411) and a second sliding cavity II (412) of the cross sliding coupling. The cross sliding coupling (6) cooperates with both the first sliding cavity I (411) and the second sliding cavity II (412) of the cross sliding coupling.

7. A car seat concentric angle adjuster according to claim 2, characterized in that: At the right end of the gear drive shaft (711) and at a position extending to the right side of the backrest drive plate (4) through the center hole (42) of the backrest drive plate, a locking member engagement part (7113) is formed. The locking member (7112) engages with the locking member engagement part (7113). The locking member (7112) is a snap ring or a cotter pin. When the locking member (7112) is a snap ring, the locking member engagement part (7113) is a snap ring groove, and when the locking member (7112) is a cotter pin, the locking member engagement part (7113) is a cotter pin insertion hole.

8. A car seat concentric angle adjuster according to claim 1, characterized in that: In the middle region on the right side of the seat back moving plate (4) and at equal intervals around the circumference of the middle region, there is a seat back frame welding fixing flange (43) for fixing the seat back moving plate (4) to the seat back frame of the car seat. The seat back frame welding fixing flange (43) is formed by transferring material formed by stamping into the recess in the cross sliding coupling receiving cavity (41) to the right side of the seat back moving plate (4).

9. A concentric angle adjuster for a car seat according to claim 8, characterized in that: A central through hole (51) is formed at the center of the backrest moving plate control plate (5). The middle area on the right side of the backrest moving plate (4) and the welding fixing flange (43) of the backrest frame correspond to the central through hole (51). A backrest moving plate edge receiving cavity (52) is formed on the left side of the backrest moving plate control plate (5) and around the backrest moving plate control plate (5). The periphery of the backrest moving plate (4) is matched with the backrest moving plate edge receiving cavity (52). The backrest moving plate control plate (5) also has a welding flange edge (53). The welding flange edge (53) is welded to the right side of the inner tooth plate (1). An inner tooth plate fixing hole (13) for fixing the inner tooth plate (1) to the seat frame is provided on the inner tooth plate (1).

10. A car seat, characterized in that: It has a car seat concentric adjuster as described in claim 1.

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