Seat back folding mechanism

Abstract

This utility model relates to a seat back folding mechanism, characterized in that it includes: first and second dual-adjustment assemblies, each comprising a manual and an electric adjuster; an electric synchronizing rod connecting the first and second electric adjusters so that they can be driven synchronously; first and second unlocking handles respectively assigned to the first and second manual adjusters for unlocking; and an unlocking controller connected to the first and second unlocking handles via Bowden wires. By operating the unlocking controller, the first and second unlocking handles can be synchronously unlocked by the first and second manual adjusters. In the unlocked state of the first and second manual adjusters, the seat back can be manually folded relative to the seat cushion from a first position to a second position different from the designed position. The technical effect includes: enabling rapid occupant escape or rapid entry by folding to a second position different from the designed position.

Description

Technical Field

[0001] This utility model relates to a seat back folding mechanism. Background Technology

[0002] A seat adjuster connects the seat and backrest of a car seat. Passengers can use the seat adjuster to adjust the backrest angle to the optimal position for the most comfortable and familiar seating angle. For the driver, adjusting the backrest angle provides the best visibility and facilitates easy operation of controls such as the steering wheel, pedals, and gearshift.

[0003] In the event of an emergency, such as a car accident, occupants in all three rows of a vehicle need to quickly fold down their seatbacks for an emergency escape. For vehicles with only front doors, second-row occupants need to quickly fold down one row of seatbacks for rapid entry. Under these emergency escape and rapid entry requirements, the relatively slow seatback adjustment of an electric recliner is insufficient.

[0004] It is known that electric seat back adjusters can continuously adjust the seat back angle, while manual seat back adjusters can non-continuously fold the seat back manually. In order to combine the advantages of both manual and electric seat back adjusters, namely, to continuously adjust and quickly fold the seat back, existing combined adjustment mechanisms are usually implemented by separating and integrating some core components of the electric seat back adjuster and some core components of the manual seat back adjuster. However, this method is complex in structure, cumbersome in assembly, and expensive. Utility Model Content

[0005] The purpose of this invention is to provide a seat back folding mechanism that can solve at least one of the problems mentioned above.

[0006] To achieve the above objectives, this utility model proposes a seat back folding mechanism, characterized in that the seat back folding mechanism comprises:

[0007] A first dual-angle adjuster assembly and a second dual-angle adjuster assembly are respectively disposed on both sides of the seat for folding the seat back relative to the seat cushion. The first dual-angle adjuster assembly includes a first manual adjuster and a first electric adjuster fixedly connected to each other, and the second dual-angle adjuster assembly includes a second manual adjuster and a second electric adjuster fixedly connected to each other.

[0008] An electric synchronizing rod connects the first electric angle adjuster and the second electric angle adjuster to each other so that they can be driven synchronously.

[0009] A first unlocking handle and a second unlocking handle are respectively assigned to a first manual angle adjuster and a second manual angle adjuster for unlocking the first manual angle adjuster and the second manual angle adjuster, respectively; and

[0010] An unlocking controller is provided, which is connected to the first unlocking handle and the second unlocking handle via Bowden cables. By operating the unlocking controller, the first unlocking handle and the second unlocking handle can synchronously unlock the first manual angle adjuster and the second manual angle adjuster.

[0011] When the first and second manual angle adjusters are unlocked, the seat back can be manually folded from a first position to a second position relative to the seat cushion, which is different from the designed position.

[0012] The technical advantages include: by combining the unlocking controller with the Bowden cable, the complex mechanical synchronization mechanism for simultaneously unlocking the manual seat adjuster can be eliminated, and the performance instability that may occur due to occupant compression during use can be avoided. By folding the seat back relative to the seat cushion from a first position to a second position different from the designed position, occupants can quickly fold over the seat back to escape from inside the vehicle to outside or quickly enter the vehicle from outside.

[0013] Advantageously, the first position is the design position of the seat back.

[0014] In the event of an emergency requiring escape or quick entry into the vehicle, the seat backrests, which are positioned in a way that makes it difficult or impossible for occupants to flip over, thus creating an obstacle to escape or entry.

[0015] Advantageously, the second position is a forward horizontal fold-down position of the seat back or a forward fold-down position closer to the vehicle floor; or the second position is a rearward horizontal fold-down position of the seat back or a rearward fold-down position closer to the vehicle floor.

[0016] Once the seat back is quickly folded down to these secondary positions, it is easily flipped over by the occupant and therefore no longer an obstacle to escape or entry.

[0017] Advantageously, the first manual angle adjuster and the first electric angle adjuster are fixedly connected by a first connecting plate, and / or the second manual angle adjuster and the second electric angle adjuster are fixedly connected by a second connecting plate.

[0018] Advantageously, the electric synchronizing rod can rotate relative to the first manual angle adjuster and / or the second manual angle adjuster.

[0019] This allows for easy assembly of the entire dual angle adjuster assembly. The electric synchronizing rod does not interfere with the first and / or second manual angle adjusters when rotating.

[0020] Advantageously, the first manual angle adjuster and the second manual angle adjuster are respectively arranged outside the first electric angle adjuster and the second electric angle adjuster.

[0021] Advantageously, the first discs of the first manual angle adjuster and the second manual angle adjuster are respectively fixedly connected to the seat cushion connecting plate, the second discs of the first manual angle adjuster and the second manual angle adjuster are respectively fixedly connected to the third discs of the first electric angle adjuster and the second electric angle adjuster, and the fourth discs of the first electric angle adjuster and the second electric angle adjuster are respectively fixedly connected to the backrest side panel.

[0022] Advantageously, the first manual angle adjuster and the second manual angle adjuster are respectively arranged inside the first electric angle adjuster and the second electric angle adjuster.

[0023] Advantageously, the first discs of the first manual angle adjuster and the second manual angle adjuster are respectively fixedly connected to the backrest side panel, the second discs of the first manual angle adjuster and the second manual angle adjuster are respectively fixedly connected to the third discs of the first electric angle adjuster and the second electric angle adjuster, and the fourth discs of the first electric angle adjuster and the second electric angle adjuster are respectively fixedly connected to the seat cushion connecting plate.

[0024] Advantageously, the unlocking controller is provided on the left and / or right and / or upper and / or rear side of the seat back for occupant operation.

[0025] Based on the flexibility and variability of Bowden lines, which make them easy to place, the unlocking controller can, in principle, be placed in any position on the seat itself or even in any position inside the vehicle outside the seat. This allows for flexible selection of the unlocking controller's placement position according to actual needs.

[0026] Advantageously, a cushion stop is provided on the seat cushion and a backrest stop is provided on the seat back. In a second position of the seat back or a position closer to the vehicle floor, the cushion stop can stop against the backrest stop.

[0027] Here, if the manual adjuster is still unlocked when the second position of the seat back is reached, the seat back can be held in the second position by using the seat cushion stop point to stop against the backrest stop point; if the manual adjuster is locked when the second position of the seat back is reached, the seat back can be held in the second position by using the locked manual adjuster. Alternatively, the seat cushion stop point can be made to stop against the backrest stop point in a position closer to the vehicle floor below the second position to prevent the seat back from experiencing a hard collision, for example, due to the automatic and rapid descent of the seat back based on gravity after being unlocked from the second position.

[0028] Advantageously, the manual angle adjuster has a locking-unlocking profile and a convex hull movable relative to the locking-unlocking profile, wherein the locking-unlocking profile has a locking profile and an unlocking profile adjacent to each other, the manual angle adjuster is locked when the convex hull is in the locking profile, and the manual angle adjuster is unlocked when the convex hull is in the unlocking profile, wherein the unlocking profile includes an arc with a predetermined angle, and the convex hull is slidable along the arc and held in the unlocked position by the arc.

[0029] Advantageously, the predetermined angle of the arc is greater than 120°.

[0030] The predetermined angle of the arc is related to the folding angle that the seat back can achieve after the manual adjuster is unlocked.

[0031] Advantageously, when the convex bulge is located at the end of the arc, the manual angle adjuster is in the unlocked state, and the seat back is held in its second position by the stops of an external stop pair, the external stop pair including a cushion stop on the seat cushion and a backrest stop on the seat back.

[0032] Advantageously, locking profiles are provided at both ends of the arc, and when the convex bulge is located in the two locking profiles respectively, the seat back is located in its first position and second position respectively, and the seat back is held in its second position by locking by the manual angle adjuster.

[0033] Advantageously, the locking-unlocking profile is located on a separate travel control panel and the travel control panel is fixed to one of the panels of the manual angle adjuster; or the locking-unlocking profile is integrated into one of the panels of the manual angle adjuster. Attached Figure Description

[0034] The present invention will now be explained in more detail with reference to the accompanying drawings and embodiments, but the present invention is not limited to the embodiments described in the drawings and detailed below. The drawings are as follows:

[0035] Figure 1 This is a schematic diagram of the overall structure of a seat back folding mechanism according to a preferred embodiment of the present invention;

[0036] Figure 2 yes Figure 1 A cross-sectional view of the seat back folding mechanism;

[0037] Figure 3 yes Figure 1 A schematic diagram of the assembly process of the first dual angle adjuster assembly;

[0038] Figure 4 This is a schematic side view of a standard manual angle adjuster;

[0039] Figure 5 This is a schematic side view of the manual angle adjuster in this embodiment;

[0040] Figure 6 yes Figure 1 An exploded view of the second dual-angle adjuster assembly;

[0041] Figure 7 This schematic shows the unlocking controller connected to the two unlocking handles via Bowden cables;

[0042] Figure 8 Shown schematically in a side view Figure 7 The Bowden cable is connected to the lever of the unlocking handle;

[0043] Figure 9 A schematic 3D diagram is shown. Figure 7 The Bowden cable is connected to the lever of the unlocking handle;

[0044] Figure 10 This is a schematic diagram of the overall structure of the seat back folding mechanism according to another preferred embodiment of the present invention;

[0045] Figure 11 An exploded view of a manual angle adjuster according to the present invention is shown schematically.

[0046] Figure 12 schematically shown Figure 11 The drive mechanism for the manual angle adjuster;

[0047] Figure 13 schematically shown Figure 11 The travel control panel of the manual angle adjuster;

[0048] Figure 14 schematically shown Figure 11 The assembly state of the stroke control disc of the manual angle adjuster in the toothed plate;

[0049] Figure 15 schematically shown Figure 11 Exploded view of the travel control panel and toothed plate of the manual angle adjuster;

[0050] Figure 16 schematically shown Figure 11 The manual angle adjuster is in the locked state, with the convex hull embedded in the slot;

[0051] Figure 17 schematically shown Figure 11 The manual angle adjuster is in the unlocked state, with the convex hull disengaged from the slot;

[0052] Figure 18 schematically shown Figure 11The manual angle adjuster is in a rotational state, in which the convex hull has moved a certain distance along the arc and the inner circle;

[0053] Figure 19 schematically shown Figure 11 The final rotation state of the manual angle adjuster, in which the convex hull has moved to its end position along the arc, and the manual angle adjuster is still in the unlocked state;

[0054] Figure 20 The schematic illustration shows the final rotational state of a manual angle adjuster according to another embodiment, wherein the convex hull has moved along the arc to the additional slot and is embedded therein, and the manual angle adjuster enters the locked state;

[0055] Figure 21 The diagram schematically illustrates a toothed plate for another manual angle adjuster, which integrates a locking-unlocking profile.

[0056] Figure 22 schematically shown Figure 21 A manual angle adjuster, in which a convex hull is shown;

[0057] Figure 23 The illustration shows the seat back in its designed position;

[0058] Figure 24 The illustration shows the seat back folded forward horizontally.

[0059] Figure 25 This illustration shows the seat back in its maximum forward folding position;

[0060] Figure 26 The illustration shows the seat back in a horizontally folded-back position;

[0061] Figure 27 The illustration shows the seat back in its maximum forward-folded position, with the backrest abutting against the seat cushion abutting point; and

[0062] Figure 28 It is a schematic 3D diagram showing the backrest blocking the seat cushion. Detailed Implementation

[0063] The following describes illustrative embodiments of the present invention. In this specification, various systems, structures, and devices are schematically depicted in the accompanying drawings for illustrative purposes only, and not all features of actual systems, structures, and devices are described. For example, well-known functions or structures are not described in detail to avoid unnecessary detail that could obscure the present invention. It should be understood that in any practical application, many specific implementation decisions need to be made to achieve the specific goals of the developer or user, and system-related and industry-related limitations need to be followed. These specific goals may vary depending on the practical application. Furthermore, it should be understood that while such implementation decisions are complex and time-consuming, they are routine tasks for those skilled in the art who will benefit from the present invention.

[0064] The terms and phrases used herein should be understood and interpreted in accordance with the understanding of those skilled in the art. The consistent use of terms or phrases herein is not intended to imply a specific definition, i.e., a definition different from the common and conventional meaning understood by those skilled in the art. For terms or phrases intended to have a specific meaning, i.e., a meaning different from that understood by those skilled in the art, such specific definition will be explicitly listed in the specification, giving the specific definition of the term or phrase directly and unambiguously.

[0065] Unless otherwise required by the content, throughout the following description, the word “including” and its variations, such as “comprising” and “having”, will be interpreted in an open-ended, inclusive sense, that is, as “including but not limited to”.

[0066] The preferred embodiments of this utility model are given below with reference to the accompanying drawings and described in detail.

[0067] like Figure 1 As shown, a preferred embodiment of the seat back folding mechanism according to this utility model includes a first dual-angle adjuster assembly 1, a second dual-angle adjuster assembly 2, and an electric synchronizing rod 3. The first dual-angle adjuster assembly 1 is mounted on the left side of the seat back via a first seat cushion connecting plate 1a and a first backrest side plate 1b. The second dual-angle adjuster assembly 2 is mounted on the right side of the seat back via a second seat cushion connecting plate 2a and a second backrest side plate 2b. The first dual-angle adjuster assembly 1 and the second dual-angle adjuster assembly 2 are connected only by the electric synchronizing rod 3.

[0068] like Figures 1 to 3As shown, the first dual-adjustment assembly 1 includes a first manual adjuster 11 having a first disc 111 (configured as a fixed disc) and a second disc 112 (configured as a movable disc), a first electric adjuster 12 having a third disc 121 (configured as a fixed disc) and a fourth disc 122 (configured as a movable disc), and a first connecting plate 13. The first manual adjuster 11 is mounted on the left outer side of the seat via a first seat cushion connecting plate 1a with its first disc 111 on the left side. The first electric adjuster 12 is mounted on the right inner side of the seat via a first backrest side plate 1b with its fourth disc 122 on the right side. The second disc 112 on the right side of the first manual adjuster 11 and the third disc 121 on the left side of the first electric adjuster 12 are fixedly connected together via the first connecting plate 13. In this embodiment, the first manual adjuster 11 and the first electric adjuster 12 are welded and fixed to the left and right sides of the first connecting plate 13, respectively. Figure 3 As shown, the specific assembly process includes first fixing the right side of the first connecting plate 13 to the third disc 121 (here configured as an outer toothed plate) on the left side of the first electric angle adjuster 12 by laser welding the entire circle of the first connecting plate 13. Then, fixing the left side of the first connecting plate 13 to the second disc 112 (here configured as a toothed plate) on the right side of the first manual angle adjuster 11 by laser welding the entire circle of the first connecting plate 13.

[0069] See Figure 2 and Figure 7 Similar to and mirror-symmetrically arranged with the first dual-adjustment assembly 1, the second dual-adjustment assembly 2 includes a second manual adjuster 21 having a first disc 211 (configured as a fixed disc) and a second disc 212 (configured as a movable disc), a second electric adjuster 22 having a third disc 221 (configured as a fixed disc) and a fourth disc 222 (configured as a movable disc), and a second connecting plate 23. The second manual adjuster 21 is mounted on the right outer side of the seat via a second seat cushion connecting plate 2a with its first disc 211 on the right side. The second electric adjuster 22 is mounted on the right inner side of the seat via a second backrest side plate 2b with its fourth disc 222 on the left side. The second disc 212 on the left side of the second manual adjuster 21 and the third disc 221 on the right side of the second electric adjuster 22 are fixedly connected together via the second connecting plate 23. In this embodiment, the second electric adjuster 22 and the second manual adjuster 21 are welded and fixed to the left and right sides of the second connecting plate 23, respectively.

[0070] See Figure 1 and Figure 2The electric synchronizing rod 3 is fixedly connected to the first electric angle adjuster 12 and the second electric angle adjuster 22 in a non-rotatable manner. Thus, by driving the electric synchronizing rod 3 to rotate, the two electric angle adjusters 12 and 22 can be driven to work simultaneously. That is, the two fourth discs 122 and 222 (moving discs) of the two electric angle adjusters 12 and 22, which are fixedly connected to the two backrest connecting plates 1b and 2b, rotate relative to their two third discs 121 and 221 (fixed discs), thereby driving the backrest to rotate relative to the seat cushion.

[0071] Additionally, for ease of installation, the electric synchronizing rod 3 also passes through both the first manual angle adjuster 11 and the second manual angle adjuster 21, but is not fixedly connected to them; instead, it can rotate relative to them. For this purpose, see [link to relevant documentation]. Figure 4 and Figure 5 It can be in Figure 4 The protrusion and recess feature 113' (used for a non-rotatable fixed connection with the synchronizing rod) within the center hole (e.g., configured as a spline hole) of the conventional manual angle adjuster 11' shown is removed to obtain Figure 5 In the manual angle adjusters 11 and 21 shown in this embodiment, since their central holes no longer have the convex and concave features 113' that engage or interfere with the electric synchronizing rod 3, the electric synchronizing rod 3 is allowed to rotate freely within them without being affected by its movement.

[0072] See Figure 1 and Figure 2 , Figures 7 to 9 To unlock each manual angle adjuster 11, 21, an unlocking handle 17, 27 is provided for each manual angle adjuster 11, 21. Each unlocking handle 17, 27 is operatively connected to the corresponding manual angle adjuster 11, 211 (fixed plate) on the outside of the first plate 111, 211 (fixed plate) of the corresponding manual angle adjuster 11, 211 (here, on the outside of each entire dual angle adjuster assembly). By rotating the unlocking handle 17, 27, the mating manual angle adjuster 11, 21 can be unlocked, that is, after unlocking, the second plate 112, 212 (moving plate) of the manual angle adjuster 11, 211 can be rotated relative to its first plate 111, 211 (fixed plate). Therefore, after unlocking, by manually pushing the backrest forward or backward, the backrest can drive the third discs 121, 221 and the fourth discs 122, 222 of the entire electric angle adjuster 12, 22, and the second discs 112, 212 (moving discs) of the manual angle adjuster 11, 21, relative to the first discs 111, 211 (fixed discs) of the manual angle adjuster 11, 21. Additionally, thrust caps 18 can be provided on the outer sides of the unlocking handles 17, 27 for axial positioning.

[0073] See also Figures 7 to 9To enable simultaneous operation of the two unlocking handles 17 and 27 to unlock the two manual angle adjusters 11 and 21, Bowden cables 14 (e.g., steel wire ropes) are connected to the two unlocking handles 17 and 27, respectively, and to the levers 15 of the two unlocking handles 17 and 27. An unlocking controller 16 is also provided, to which the Bowden cables 14 are connected. By operating the unlocking controller 16, the Bowden cables 14 can be pulled, simultaneously rotating the two unlocking handles 17 and 27 to unlock the two manual angle adjusters 11 and 21. Alternatively, only one Bowden cable 14 can be used, with both ends fixed to the levers 15 of the two unlocking handles 17 and 27, and passing through the unlocking controller 16 for manipulation, such as pulling. Two independent Bowden cables 14 can also be used, each with one end fixed to one of the levers 15 of the two unlocking handles 17 and 27, and the other end connected to the same unlocking controller 16. By operating the unlocking controller 16, pulling the one Bowden cable 14 or the two separate Bowden cables 14 simultaneously pulls the two unlocking handles 17 and 27 to perform the unlocking action. The unlocking controller 16 can be configured as a pull-unlocking component, having a pull handle 161. For example, the one Bowden cable 14 or the two separate Bowden cables 14 are fixedly connected to the pull handle 161, so that by pulling the pull handle 161, the two unlocking handles 17 and 27 can be operated simultaneously to unlock the two manual angle adjusters 11 and 21.

[0074] The unlocking controller 16 can be located on the upper side of the backrest of the second row seat or below the backrest. This arrangement makes it easy for passengers sitting in the third row to reach the unlocking controller 16 on the front seat and unlock the second row seat. This allows the passenger to unlock the second row seat in an emergency, flip it forward, and step over the flipped-forward second row seat to escape from the door.

[0075] The unlocking controller 16 can also be located on the left or right side of the backrest of the third row seat, near the unlocking handles 17 and 27. This arrangement makes it easy for the occupants sitting in the third row seat to reach the unlocking controller 16 on their own seat and unlock it. This allows the occupant to unlock the seat in an emergency, flip it over, and step over the flipped-over third row seat to escape from the trunk.

[0076] In addition, for vehicles with only front doors, such as coupes, in order to facilitate passengers to quickly enter the second row of seats from the front doors, an unlocking controller 16 can be installed on the first row of seats so that passengers can unlock it in an emergency, fold it forward, and step over the folded first row of seats to quickly enter the second row of seats from the door.

[0077] The application scenarios mentioned above are merely illustrative and not exhaustive. It is also conceivable to install unlocking controllers 16 at multiple different locations on a seat to facilitate easy unlocking and quick forward or backward folding for the occupant of that seat and occupants of other seats.

[0078] By combining the unlock controller 16 with the Bowden line 14, and leveraging the flexibility and variability of the Bowden line 14 to facilitate its placement, the unlock controller 16 can, in principle, be placed at any position on the seat itself or even at any position inside the vehicle outside the seat. This allows for flexible selection of the placement position according to actual needs.

[0079] Figure 10 This illustration shows a seat back folding mechanism according to another preferred embodiment of the present invention. Its components are the same as in the previous embodiment, the only difference being the arrangement of the two dual adjuster assemblies. Specifically, each dual adjuster assembly 1 and 2 is rotated 180 degrees left and right. Here, each manual adjuster 11 and 21 is mounted on the inner side of the seat via its first discs 111 and 211 through corresponding backrest side plates 1b and 2b. Each electric adjuster 21 and 22 is mounted on the outer side of the seat via its fourth discs 122 and 222 through corresponding seat cushion connecting plates 1a and 2a. The second discs 112 and 212 of each manual adjuster 11 and 21 and the third discs 121 and 221 of the corresponding electric adjusters 21 and 22 are still fixedly connected via corresponding connecting plates 13 and 23.

[0080] Similarly, for the synchronized unlocking of each manual angle adjuster 11, 21, an unlocking handle 17, 27 is provided for each manual angle adjuster 11, 21. Each unlocking handle 17, 27 is operatively connected to the corresponding manual angle adjuster 11, 211 (moving disc) on the inside of the first disc 111, 211 (moving disc) of the corresponding manual angle adjuster 11, 21 (in this case, the inside of each entire dual angle adjuster assembly 1, 2). By rotating the unlocking handle 17, 27, the mating manual angle adjuster 11, 21 can be unlocked, that is, after unlocking, the first disc 111, 211 (moving disc) of the manual angle adjuster is allowed to rotate relative to its second disc 112, 212 (fixed disc). Therefore, after unlocking, by manually pushing the backrest forward or backward, the backrest can cause the first discs 111, 211 (moving discs) of the manual angle adjusters 11, 12 to rotate relative to the second discs 112, 212 (fixed discs) of the manual angle adjusters and the third discs 121, 221 and the fourth discs 122, 222 of the entire electric angle adjusters 21, 22.

[0081] Similarly, the electric synchronizing rod 3 is fixedly connected to the first electric angle adjuster 12 and the second electric angle adjuster 22 in a non-rotatable manner. Therefore, by driving the electric synchronizing rod 3 to rotate, both electric angle adjusters 12 and 22 can be driven simultaneously. Specifically, the third discs 121 and 221 (moving discs) of the two electric angle adjusters 12 and 22, which are fixedly connected to the second discs 112 and 212 of the corresponding manual angle adjusters 11 and 21, rotate relative to their fourth discs 122 and 222 (fixed discs), simultaneously causing the entire manual angle adjuster 11 and 21, and thus the backrest, to rotate relative to the seat cushion. During electric adjustment, the manual angle adjusters 11 and 21 are in a locked state.

[0082] Similarly, an unlocking controller 16 may be provided, which can simultaneously unlock the two unlocking handles 17 and 27 via Bowden lines 14 connected to the two unlocking handles 17 and 27 respectively. In addition, thrust caps 18 are provided on the inner sides of the unlocking handles 17 and 27 respectively for axial positioning.

[0083] Therefore, by combining the unlock controller 16 with the Bowden line 14, the complex mechanical synchronization mechanism for simultaneously unlocking the manual angle adjusters 11 and 21 can be eliminated, and the performance instability that might occur due to occupant compression during use can be avoided. Furthermore, it also allows for… Figure 2 Examples and Figure 10 In this embodiment, the positions of the electric angle adjusters 12 and 22 and the manual angle adjusters 11 and 21 are interchanged.

[0084] The aforementioned electric adjusters 12 and 22 and manual adjusters 11 and 21 can be commercially available, mass-produced electric adjusters 12 and 22 and manual adjusters 11 and 21. They can be easily modified as needed (e.g., modifying the center hole of the manual adjuster 11 and 21 to a non-convex / concave feature 113' as mentioned above) and then fixedly assembled via connecting plates 13 and 23. Therefore, there is no need to redesign the development platform, significantly reducing development costs. Furthermore, the structure is simple, assembly is convenient, and it can be modularly applied to various scenarios. Moreover, by selecting electric adjusters 12 and 22 and manual adjusters 11 and 21 with different strength levels, seat back folding requirements of different strengths can be met, thus modularly adapting to seat back frames of different widths.

[0085] Figures 11 to 15 An exemplary manual angle adjuster 11, 21 that can be used herein is shown. See also Figure 11 The manual angle adjusters 11 and 21, from left to right, mainly include: a cap 120, a main board (configured here as the second disc 112, 212), a cam spring 122, a cam 123, four locking plates 124, a control disc 125, a travel control disc 126, a toothed plate (configured here as the first disc 111, 211), a clamp 121, and a bushing 127. See also... Figure 12 The four components—the anti-removal cap 120, the cam 123, the control panel 125, and the bushing 127—are nested together in a shape-fitting, non-rotatable manner, forming the driving element of the manual angle adjusters 11 and 21. The driving element is operatively connected to the unlocking handles 17 and 27 and is driven to rotate as the unlocking handles 17 and 27 rotate. The four locking plates 124 are always subjected to a radially outward force based on the return force of the cam spring 122. The rotation of the driving element by the unlocking handles 17 and 27 causes the four locking plates 124 to move radially inward. Each locking plate 124 has a protrusion 1241, and the four protrusions 1241 of the four locking plates 124 are respectively matched with four slots 1263, which will be described later.

[0086] See Figures 13 to 15 The travel control disc 126 of the manual angle adjusters 11 and 21 can be constructed independently of the toothed plates (first discs 111 and 211) and can be locked into the toothed plates without relative rotation. The travel control disc 126 has a locking-unlocking profile, which in this embodiment, as the unlocking profile, includes two concentric arcs 1261 of the same diameter and an inner circle 1262 with a smaller diameter than the concentric arcs 1261. Each arc 1261 may have an angle greater than 160°, or even close to 180°. As the locking profile, a radially inwardly opening slot 1263 is provided at one end of each concentric arc 1261, and the slots 1263 on the two concentric arcs 1261 are radially symmetrical to each other. Two radially inwardly opening, radially symmetrical slots 1263 are provided on the inner circle 1262. These four slots 1263 are arranged successively at 90° intervals.

[0087] See Figure 16 This shows the initial or locked state of the manual angle adjusters 11 and 21. In the locked state of the manual angle adjusters 11 and 21, the four protrusions 1241 of the four locking plates 124 are respectively engaged in the four slots 1263 and are in the locked position to prevent relative rotation between the first discs 111 and 211 and the second discs 112 and 212.

[0088] from Figure 16 Starting from the locked state, the unlocking controller 16 is manipulated to rotate the unlocking handles 17 and 27, which in turn rotates the drive unit until the lock is reached. Figure 17 The manual angle adjusters 11 and 21 are shown in their unlocked state. In the unlocked state of the manual angle adjusters 11 and 21, the four locking plates 124 have driven the four protrusions 1241 to move radially inward and leave the four slots 1263 respectively to enter the unlocked position, so as to allow relative rotation between the first discs 111 and 211 and the second discs 112 and 212.

[0089] Next, in the unlocked state, the occupant can manually fold the backrest, causing the first tray 111, 211 and the second tray 112, 212 to rotate relative to each other. At the same time, this causes the four protrusions 1241 to move along the two concentric arcs 1261 and the inner circle 1262, and the protrusions 1241 are restricted or kept in the unlocked position. Figure 18 The diagram shows the position of the protrusion 1241 after it has moved a small distance. During this process, the two concentric arcs 1261 and the inner circle 1262 of the travel control disc 126 restrict the four protrusions 1241 and therefore the four locking plates 124 to move radially outward while locking the manual angle adjusters 11, 21, thereby allowing the backrest to fold freely at a large angle, rather than locking every two degrees, for example.

[0090] Figure 19 The diagram shows that the two convex humps 1241 have moved to the end positions of the two concentric arcs 1261, but the manual angle adjusters 11 and 21 are still unlocked. At this point, the backrest is folded to its final position relative to the seat cushion and cannot fold further; this can be achieved through external stop points on the seat cushion and backrest. See also... Figure 27 and Figure 28 The external stop pair exemplarily shown includes a seat cushion stop 50 provided on the seat cushion, such as a lateral protrusion, and a backrest stop 60 on the backrest, such as a stop edge cut from the thickness of the material. In the final position of the backrest, the seat cushion stop 50 stops against the backrest stop 60.

[0091] Here, the setting of the unlocking profile of the travel control panel 126 causes the convex hull 1241 to move from... Figure 17 The position of the slot 1263 on the radial inner side is moved to the position shown. Figure 19 During the process at the end positions of the two concentric arcs 1261 shown, the convex bulge 1241 remains in the unlocked position, thus the manual angle adjusters 11 and 21 remain unlocked, allowing the occupant to continuously and rapidly fold the backrest during this process. For each concentric arc 1261, the angle between the slot 1263 and the end position of the concentric arc 1261 can be flexibly set, and can be set relatively large, for example, up to a maximum of 156°. This allows for rapid, large-angle folding of the backrest after the manual angle adjusters 11 and 21 are unlocked, facilitating emergency escape or rapid entry for the occupant.

[0092] If the backrest folds forward from its designed position, an angle of 120° to 140°, such as 130°, is sufficient. A larger angle, such as 156°, allows the backrest to fold directly from a fully reclined position to a forward-folded position. However, if the travel control panel 126, specifically its locking-unlocking profile, is not provided, the backrest can only fold 2° each time the manual angle adjusters 11 and 21 are unlocked. This does not allow for emergency escape or quick entry for occupants.

[0093] To achieve a backrest that can fold quickly forward and backward from its designed position, the slots 1263 on the two concentric arcs 1261 can be positioned approximately at the center of the arcs. This allows the protrusion 1241 to move along the front and rear sections of the concentric arcs 1261 before and after the slots 1263, respectively, during forward and backward folding, preventing it from entering the locked position and enabling a large-angle, rapid folding of the backrest. For example, for a 156° arc 1261, if the slots 1263 are positioned at the midpoint, the backrest can fold forward or backward a maximum of 78° after unlocking. Of course, the specific position of the slots 1263 within the concentric arcs 1261 can be flexibly set according to requirements.

[0094] Figure 20 Showing different Figure 19 Another embodiment of the stroke control panel 126 shown is described. Here, an additional slot 1264 (which is also configured as a locking profile) is provided on each concentric arc 1261 before the end position. Therefore, when the convex hull 1241 moves, it first moves radially outward into the additional slot 1264, thereby causing the manual adjuster to enter the locked state again. Figure 20 The diagram shows the convex bulge 1241 embedded in the additional slot 1264, with the manual adjusters 11 and 21 locked. The locking force of the manual adjusters 11 and 21 (between the first discs 111 and 211 and the second discs 112 and 212) effectively locks the relative rotation between the backrest and the seat cushion, eliminating the need for external stop points at the corresponding position of the additional slot 1264. However, it is conceivable that if the manual adjusters 11 and 21 are unlocked again (e.g., to fold the backrest back to the designed position), and the backrest continues to fold (e.g., undesirably automatically due to gravity) based on the path from the additional slot 1264 to the end position, an additional external stop point pair could be provided at the corresponding position of the backrest and seat cushion along this path. This would then be used to stop the backrest after unlocking again, preventing it from undesirably folding directly to the end.

[0095] Figure 21 Another embodiment of the manual angle adjusters 11, 21 is schematically shown. Here, the separately constructed travel control panel 126 is omitted, and instead, the features of its locking-unlocking contour, specifically the arc 1261 and inner circle 1262 as the unlocking contour, and the two slots 1263 as the locking contour are directly and integrally integrated onto the toothed plate. Figure 22 The diagram shows the interaction between the protrusions 1241 of the four locking plates 124 and the locking-unlocking contours on the toothed plates, which is basically the same as in the previous embodiment and will not be described again here.

[0096] Figure 23An embodiment of a seat 300 equipped with a seat back folding mechanism is shown, wherein the seat back 301 is in the designed position here.

[0097] Figure 24 The backrest 301 of seat 300 is shown in the unlocked state of manual adjusters 11 and 21, for example, in a forward horizontal folding position from the designed position. In the forward horizontal folding position, it is suitable for occupants to step over seat 300 to escape or enter.

[0098] Figure 25 The maximum forward folding position of the backrest 300 is shown. By designing a large angle of concentric arc 1261, the backrest 301 can continue to fold forward to the maximum folding position when the manual angle adjusters 11 and 21 are unlocked. At this time, the headrest of the backrest 301 is basically against the front end of the seat cushion.

[0099] Figure 26 The image shows the backrest 301 of seat 300 folded back to a horizontal position from its designed position, for example, with the manual adjusters 11 and 21 unlocked. In this horizontally folded-back position, the third-row seat 300 is positioned such that third-row occupants can step over it to escape from the trunk.

[0100] In summary, the seat back folding mechanism of this utility model not only enables the electric comfort adjustment function of the seat back 301 through the synchronous rotation of the electric angle adjusters 12 and 22, but also allows the seat back 301 to fold freely forward or backward at a large angle, for example, from the designed position, through the simple and reliable synchronous unlocking of the manual angle adjusters 11 and 21, thereby enabling occupants to quickly enter the rear seat 300 of the vehicle and escape from the vehicle to the outside.

[0101] Finally, it should be noted that the above embodiments are merely for understanding and explaining the present invention, and do not constitute a limitation on the scope of protection of the present invention. Those skilled in the art can make modifications or recombinations based on the above embodiments, and none of these modifications or recombinations depart from the scope of protection of the present invention.

Claims

1. A seat back folding mechanism, characterized in that, The seat back folding mechanism includes: A first dual-angle adjuster assembly and a second dual-angle adjuster assembly are respectively disposed on both sides of the seat for folding the seat back relative to the seat cushion. The first dual-angle adjuster assembly includes a first manual adjuster and a first electric adjuster fixedly connected to each other, and the second dual-angle adjuster assembly includes a second manual adjuster and a second electric adjuster fixedly connected to each other. An electric synchronizing rod connects the first electric angle adjuster and the second electric angle adjuster to each other so that they can be driven synchronously. A first unlocking handle and a second unlocking handle are respectively assigned to a first manual angle adjuster and a second manual angle adjuster for unlocking the first manual angle adjuster and the second manual angle adjuster, respectively; and An unlocking controller is provided, which is connected to the first unlocking handle and the second unlocking handle via Bowden cables. By operating the unlocking controller, the first unlocking handle and the second unlocking handle can synchronously unlock the first manual angle adjuster and the second manual angle adjuster. When the first and second manual angle adjusters are unlocked, the seat back can be manually folded from a first position to a second position relative to the seat cushion, which is different from the designed position.

2. The seat back folding mechanism according to claim 1, characterized in that, The first position is the design position of the seat back.

3. The seat back folding mechanism according to claim 1, characterized in that, The second position is either the seat back folded forward horizontally or closer to the vehicle floor; or the second position is either the seat back folded backward horizontally or closer to the vehicle floor.

4. The seat back folding mechanism according to claim 1, characterized in that, The first manual angle adjuster and the first electric angle adjuster are fixedly connected by a first connecting plate, and / or the second manual angle adjuster and the second electric angle adjuster are fixedly connected by a second connecting plate.

5. The seat back folding mechanism according to claim 1, characterized in that, The electric synchronizing rod can rotate relative to pass through the first manual angle adjuster and / or the second manual angle adjuster.

6. The seat back folding mechanism according to claim 1, characterized in that, The first manual angle adjuster and the second manual angle adjuster are respectively arranged outside the first electric angle adjuster and the second electric angle adjuster.

7. The seat back folding mechanism according to claim 6, characterized in that, The first discs of the first manual angle adjuster and the second manual angle adjuster are respectively fixedly connected to the seat cushion connecting plate. The second discs of the first manual angle adjuster and the second manual angle adjuster are respectively fixedly connected to the third discs of the first electric angle adjuster and the second electric angle adjuster. The fourth discs of the first electric angle adjuster and the second electric angle adjuster are respectively fixedly connected to the backrest side panel.

8. The seat back folding mechanism according to claim 1, characterized in that, The first manual angle adjuster and the second manual angle adjuster are respectively arranged inside the first electric angle adjuster and the second electric angle adjuster.

9. The seat back folding mechanism according to claim 8, characterized in that, The first discs of the first manual angle adjuster and the second manual angle adjuster are respectively fixedly connected to the backrest side panel, the second discs of the first manual angle adjuster and the second manual angle adjuster are respectively fixedly connected to the third discs of the first electric angle adjuster and the second electric angle adjuster, and the fourth discs of the first electric angle adjuster and the second electric angle adjuster are respectively fixedly connected to the seat cushion connecting plate.

10. The seat back folding mechanism according to claim 1, characterized in that, The unlocking controller is provided on the left and / or right and / or upper and / or rear side of the seat back for occupant operation.

11. The seat back folding mechanism according to claim 1, characterized in that, The seat cushion has a seat cushion stop point, and the seat back has a backrest stop point. In the second position of the seat back or in a position closer to the vehicle floor, the seat cushion stop point can stop against the backrest stop point.

12. The seat back folding mechanism according to claim 1, characterized in that, The manual angle adjuster has a locking-unlocking profile and a convex hull that is movable relative to the locking-unlocking profile, wherein the locking-unlocking profile has a locking profile and an unlocking profile that are adjacent to each other, the manual angle adjuster is locked when the convex hull is located in the locking profile, and the manual angle adjuster is unlocked when the convex hull is located in the unlocking profile, wherein the unlocking profile includes an arc with a predetermined angle, and the convex hull is slidable along the arc and held in the unlocked position by the arc.

13. The seat back folding mechanism according to claim 12, characterized in that, The predetermined angle of the arc is greater than 120°.

14. The seat back folding mechanism according to claim 12, characterized in that, When the convex bulge is located at the end of the arc, the manual angle adjuster is in the unlocked state, and the seat back is held in its second position by the stop of the external stop point pair, which includes the seat cushion stop point on the seat cushion and the backrest stop point on the seat back.

15. The seat back folding mechanism according to claim 12, characterized in that, Locking contours are provided at both ends of the arc. When the convex bulge is located in the two locking contours, the seat back is located in the first position and the second position respectively. The seat back is held in the second position by the locking of the manual angle adjuster.

16. The seat back folding mechanism according to claim 12, characterized in that, The locking-unlocking profile is located on a separate travel control panel and the travel control panel is fixed to one of the panels of the manual angle adjuster; or the locking-unlocking profile is integrated into one of the panels of the manual angle adjuster.

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