Seat back adjustment mechanism and seat

Abstract

The present invention provides a seat back adjustment mechanism and a seat. The seat back adjustment mechanism of the present invention includes an adjustment part and a locking part arranged on a seat cushion frame, and an unlocking part arranged between the adjustment part and the seat back frame; the adjustment part is connected to the seat back frame through an angle adjuster, and an elastic part is arranged between the adjustment part and the seat cushion frame, and the elastic part is used to drive the adjustment part to return to its original position after rotation; the locking part is used to lock the adjustment part, and as the seat back frame is driven to rotate, the unlocking part can pull the locking part to move and release the lock on the adjustment part, and due to the gravity of the seat back, the adjustment part and the back frame can be synchronously rotated downward relative to the seat cushion frame to allow the elastic part to store energy. The seat back adjustment mechanism of the present invention not only meets the seat back angle adjustment requirements, but also helps to eliminate the height difference between the seat back and the seat cushion after being laid flat, thereby helping to improve the comfort of the seat back when it is laid flat.

Description

Technical Field

[0001] The present invention relates to the technical field of seats, and in particular to a seat back adjustment mechanism. Meanwhile, the present invention also relates to a seat with the seat back adjustment mechanism. Background Art

[0002] For the front and middle row seats of the car, the seat back angle adjustment device can be used to adjust the seat back angle, providing passengers with more sitting postures, relieving fatigue from long-term driving and sitting, and improving the space utilization rate in the car. However, the current car seat back angle adjustment mechanism cannot meet the comfort requirements of passengers when lying down due to the height difference between the seat cushion and the seat back after the seat back is adjusted to 180° flat. Summary of the invention

[0003] In view of this, the present invention aims to provide a seat back adjustment mechanism, so as to meet the needs of seat back angle adjustment and improve the comfort of the seat back after being laid flat.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A seat back adjustment mechanism comprises an adjustment portion and a locking portion provided on a seat cushion frame, and an unlocking portion provided between the adjustment portion and the seat back frame;

[0006] The adjusting part is connected to the backrest frame through an angle adjuster, and an elastic part is provided between the adjusting part and the seat cushion frame, and the elastic part is used to drive the adjusting part to return to its original position after rotation;

[0007] The locking portion is used to lock the adjusting portion, and as the backrest frame is driven to rotate, the unlocking portion can pull the locking portion to move, thereby releasing the lock on the adjusting portion, and due to the gravity of the seat back, the adjusting portion and the backrest frame can rotate downward synchronously relative to the seat cushion frame to allow the elastic portion to store energy.

[0008] Furthermore, the unlocking part includes a cam, a traction member and a pull wire; the cam is sleeved on the rotating shaft of the backrest frame and rotates synchronously with the rotating shaft; the traction member is slidably arranged on the backrest frame and abuts against the cam to receive the push of the cam, and a first elastic member is provided between the traction member and the backrest frame, and the first elastic member is used to drive the traction member to return to its position after sliding; the pull wire is connected between the traction member and the locking part, and the pull wire can pull the locking part to operate as the traction member slides.

[0009] Furthermore, the locking portion is rotatably disposed on the seat cushion frame, and a second elastic member is disposed between the locking portion and the seat cushion frame, and the second elastic member is used to drive the rotating locking portion to return to its original position.

[0010] Furthermore, the locking portion includes a locking plate rotatably arranged on the seat cushion frame, and a locking tooth guided and slidably arranged on the locking plate, and the second elastic member is connected between the locking plate and the seat cushion frame; the locking tooth is connected to the pull wire and can be inserted into the adjustment portion to lock the position of the adjustment portion, and the locking tooth can unlock the adjustment portion and push the locking plate to rotate due to the pulling of the pull wire; a third elastic member is provided between the locking tooth and the locking plate, and the third elastic member is used to drive the locking tooth to return to its position after sliding.

[0011] Furthermore, a wire pulling bracket is slidably provided on the lock plate, and the wire pulling bracket is connected between the lock teeth and the wire pulling bracket.

[0012] Furthermore, the adjusting part is provided with a plurality of teeth and a plurality of stop posts, and the plurality of teeth and the plurality of stop posts are spaced around the rotation center of the adjusting part, and the teeth are close to the rotation center of the adjusting part relative to the stop posts. As the adjusting part rotates downward relative to the seat cushion frame, the locking part can be inserted between one of the stop posts and one of the teeth to lock the adjusting part.

[0013] Furthermore, the adjustment part includes a backrest connecting plate and an adjustment plate connected to the backrest connecting plate, and the teeth and the stop column are both arranged on the adjustment plate; the adjustment plate and the backrest connecting plate are respectively arranged on the inner and outer sides of the seat cushion frame, and the backrest connecting plate is connected to the angle adjuster.

[0014] Furthermore, a limiting portion is provided on the seat cushion frame, and the limiting portion is used to limit the rotational displacement of the adjusting portion.

[0015] Furthermore, the limiting portion includes an arc-shaped hole arranged on the seat cushion frame, and the adjusting portion is constructed with a column slidably arranged in the arc-shaped hole.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] In the seat back adjustment mechanism of the present invention, the unlocking part can pull the locking part to move as the backrest frame is driven to rotate, thereby releasing the lock on the unlocking part, and due to the gravity of the seat back, the adjustment part and the backrest frame can be synchronously rotated downward relative to the cushion frame, while meeting the seat back angle adjustment, it is also helpful to eliminate the height difference between the seat back and the cushion after being laid flat, thereby facilitating the use comfort of the seat back when being laid flat. At the same time, the elastic part can drive the adjustment part back to its original position, which is helpful to improve the use effect of the adjustment member.

[0018] In addition, the cam rotates synchronously with the backrest frame, and the locking part is unlocked by pulling the pull wire through the traction member, and the first elastic member drives the traction member back to its position, which is conducive to improving the unlocking convenience of the unlocking part. The locking part is rotatably arranged on the cushion frame, which is convenient for locking and unlocking the adjustment part during the rotation process, and the second elastic member is conducive to driving the locking part back to its position after rotation. The setting of the lock plate and the lock teeth thereon facilitates the lock teeth to lock the adjustment part. The lock teeth can also unlock the adjustment part and push the lock plate to rotate under the pulling of the pull wire, which is conducive to further improving the convenience of unlocking.

[0019] In addition, the setting of the pull wire bracket is conducive to improving the connection between the pull wire and the lock teeth. The structure of multiple teeth and the stop column is simple, which is conducive to the locking effect of the locking part locking the adjustment part. The backrest connecting plate and the adjustment plate are easy to arrange and implement, and while meeting the synchronous rotation of the backrest frame, it is also conducive to adjusting the height difference between the seat frame and the cushion frame. The limit part is conducive to improving the reliability of the adjustment part by limiting the rotational displacement of the adjustment part. The combination of the arc hole and the column is conducive to limiting the rotational displacement of the adjustment part, and the structure is simple, which is easy to arrange and implement.

[0020] In addition, another object of the present invention is to provide a seat, comprising a seat cushion and a backrest, wherein the seat back adjustment mechanism as described above is provided between the seat cushion and the backrest.

[0021] The seat of the present invention is beneficial to improving the comfort of the seat by arranging the seat back adjustment mechanism as described above between the seat cushion and the backrest, and has good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 A partially disassembled diagram of a seat back adjustment mechanism according to an embodiment of the present invention;

[0024] Figure 2 A schematic structural diagram of a seat back adjustment mechanism according to an embodiment of the present invention in a seat back sitting position from one viewing angle;

[0025] Figure 3 A schematic structural diagram of another viewing angle of the seat backrest in a sitting position according to an embodiment of the present invention;

[0026] Figure 4 It is a structural schematic diagram of the seat back adjustment mechanism in the unlocked state according to an embodiment of the present invention;

[0027] Figure 5 It is a structural schematic diagram of the adjustment plate according to an embodiment of the present invention;

[0028] Figure 6 It is a structural schematic diagram of the locking portion according to an embodiment of the present invention at one viewing angle;

[0029] Figure 7 It is a structural schematic diagram of the locking portion according to an embodiment of the present invention from another viewing angle;

[0030] Figure 8 It is a structural schematic diagram of the lock plate according to an embodiment of the present invention at one viewing angle;

[0031] Fig. 9 It is a structural schematic diagram of the lock plate according to an embodiment of the present invention from another viewing angle;

[0032] Fig.10 It is a structural schematic diagram of the lock tooth according to an embodiment of the present invention at one viewing angle;

[0033] Fig.11 It is a structural schematic diagram of the lock tooth according to an embodiment of the present invention from another viewing angle;

[0034] Fig.12 It is a structural schematic diagram of the seat back adjustment mechanism according to an embodiment of the present invention when the seat back is in a flat state.

[0035] Description of reference numerals:

[0036] 1. Cushion frame; 2. Backrest frame; 3. Pull wire; 4. Backrest connecting plate; 5. Adjustment plate; 6. Lock plate; 7. Second pivot axis;

[0037] 101, arc-shaped hole; 102, first pivot axis; 103, torsion spring;

[0038] 201, fixed bracket; 202, rotating shaft; 203, cam; 204, angle adjuster;

[0039] 301, bottom plate; 302, first spring; 303, top rod; 304, wire bracket; 305, wire bracket;

[0040] 401, column; 402, nut;

[0041] 501, fixed column; 502, third stop column; 503, third tooth; 504, first tooth; 505, first stop column; 506, second stop column; 507, fourth tooth; 508, second tooth;

[0042] 601, locking tooth; 6011, guide column; 6012, second spring; 6013, limiting protrusion; 602, guide hole; 603, concave platform; 604, guide surface;

[0043] 701. Coil spring. DETAILED DESCRIPTION

[0044] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0045] In the description of the present invention, it should be noted that if there are terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc., they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first", "second", etc., they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0046] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installed", "connected", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0047] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0048] This embodiment relates to a seat back adjustment mechanism, which comprises an adjustment part and a locking part provided on a seat cushion frame 1, and an unlocking part provided between the adjustment part and the seat back frame 2. The adjustment part is connected to the seat back frame 2 through a recliner 204, and an elastic part is provided between the adjustment part and the seat cushion frame 1, and the elastic part is used to drive the adjustment part to return to its original position after rotation.

[0049] The locking part is used to lock the adjusting part, and as the backrest frame 2 is driven to rotate, the unlocking part can pull the locking part to move and release the lock on the adjusting part. Driven by the gravity of the seat back, the adjusting part and the backrest frame 2 can rotate downward synchronously relative to the seat cushion frame 1 to allow the elastic part to store energy.

[0050] Based on the above overall introduction, an exemplary structure of the seat back adjustment mechanism described in this embodiment is as follows: Figures 1 to 4 In order to highlight the structure of the locking part and the adjusting part, only the right side of the seat is shown in the figure of this embodiment. As shown in the figure, a rotating shaft 202 is rotatably provided between the bottom ends of the left and right backrest frames 2, and the rotating shaft 202 is connected to the adjusting handles on the two recliners 204 provided on the backrest frame 2. The left side of the backrest frame 2 not shown in the figure is also provided with a motor for driving the rotating shaft 202 to rotate.

[0051] The unlocking part in this embodiment includes a cam 203, a traction member and a pull wire 3. The cam 203 is sleeved on the rotating shaft 202 of the backrest frame 2 and rotates synchronously with the rotating shaft 202. The traction member is slidably arranged on the backrest frame 2 and abuts against the cam 203 to receive the push of the cam 203. A first elastic member is arranged between the traction member and the backrest frame 2, and the first elastic member is used to drive the traction member to return to its position after sliding.

[0052] In terms of specific structure, combined Figure 1 , Figure 2 and Figure 4 As shown in the figure, the cam 203 is sleeved on the right end of the rotating shaft 202 and fixed relatively to the rotating shaft 202 to realize synchronous rotation with the rotating shaft 202. In order to facilitate the installation of the traction member, a fixed bracket 201 is provided on the backrest frame 2 corresponding to the cam 203. The traction member includes a push rod 303 which is slidably arranged on the fixed bracket 201 along the vertical direction in the sitting state. One end of the pull wire 3 is connected to the push rod 303, and the other end is connected to the locking part. In order to improve the pushing effect of the cam 203 on the push rod 303, a bottom plate 301 abutting against the cam 203 is further provided at the bottom end of the push rod 303. During the rotation of the cam 203, the push force is applied to the push rod 303 through the bottom plate 301, thereby driving the push rod 303 to slide in the fixed bracket 201.

[0053] The above-mentioned first elastic member includes a first spring 302 which is sleeved on the push rod 303 and is located between the fixed bracket 201 and the base plate 301. The first spring 302 can compress and store energy when the cam 203 pushes the push rod 303 to slide upward through the base plate 301. At this time, the push rod 303 can pull the pull wire 3 to make the locking part release the lock on the adjustment part. When the cam 203 rotates to release the push on the base plate 301, the first spring 302 releases the stored energy and pushes the base plate 301, thereby making the push rod 303 slide downward and return to its position. The downward sliding of the push rod 303 can release the pulling of the pull wire 3, which is conducive to the locking part to lock the adjustment part again. In this embodiment, the structure and adjustment method of the unlocking part are simple, easy to arrange and implement, and have good stability in use.

[0054] The locking part in this embodiment is rotatably arranged on the cushion frame 1, and a second elastic member is arranged between the locking part and the cushion frame 1, and the second elastic member is used to drive the locking part back to its original position after rotation. As a preferred embodiment, the locking part includes a locking plate 6 rotatably arranged on the cushion frame 1, and a locking tooth 601 which is guided and slidably arranged on the locking plate 6, and the second elastic member is connected between the locking plate 6 and the cushion frame 1. The locking tooth 601 is connected to the pull wire 3, and can be inserted into the adjustment part to lock the position of the adjustment part, and the locking tooth 601 can unlock the adjustment part and push the locking plate 6 to rotate due to the pulling of the pull wire 3. A third elastic member is arranged between the locking tooth 601 and the locking plate 6, and the third elastic member is used to drive the locking tooth 601 back to its original position after sliding.

[0055] In terms of detailed structure, combined Figure 1 , Figure 2 and Figure 4 As shown in the figure, the bottom end of the lock plate 6 is rotatably arranged on the seat cushion frame 1 via the first pivot shaft 102 arranged on the seat cushion frame 1. The free end of the lock plate 6 has a bent section bent toward the adjustment portion. The second elastic member includes a torsion spring 103 sleeved on the first pivot shaft 102 and located between the lock plate 6 and the seat cushion frame 1, and the two ends of the torsion spring 103 are respectively connected to the seat cushion frame 1 and the lock plate 6. The torsion spring 103 is a mature product, easy to install, and has a good driving effect on the return of the lock plate 6.

[0056] As a preferred embodiment, the locking teeth 601 are slidably connected to the inner side of the free end of the bending section and are located between the locking plate 6 and the seat frame 1. Figure 6 , Figure 7 as well as Fig.11 As shown in , under the action of the third elastic member, the locking tooth 601 has a locking portion that can extend out of the free end of the locking plate 6, and a connecting portion connected to the locking plate 6, wherein the locking portion is used to lock the adjusting portion.

[0057] In order to further improve the effect of the lock tooth 601 in use, in this embodiment, Fig. 9 As shown in , a concave platform 603 is provided on the inner side of the lock plate 6 corresponding to the connecting portion of the lock tooth 601, and the lock tooth 601 specifically abuts against the surface of the concave platform 603. The third elastic member mentioned above includes a second spring 6012 provided between the other end of the lock tooth 601 and the lock plate 6 relative to the locking portion. The second spring 6012 can slide in the direction close to the lock plate 6, and compress and store energy when the lock tooth 601 retracts into the lock plate 6, and can drive the lock tooth 601 to slide in the direction away from the lock plate 6 by releasing the stored energy, thereby facilitating the return of the lock tooth 601.

[0058] In order to further improve the use effect of the second spring 6012, a groove is provided on the locking plate 6 corresponding to the second spring 6012, and the second spring 6012 is connected to the bottom of the groove. In this way, the use length of the second spring 6012 can be increased, so that the locking tooth 601 has a better return effect, and is conducive to improving the reliability of the locking tooth 601 on the locking of the adjustment part.

[0059] As a preferred implementation, in this embodiment, a wire support 304 is slidably provided on the lock plate 6, and the wire support 304 is connected between the lock tooth 601 and the wire 3. Fig.10 As shown in , in order to facilitate the installation of the wire bracket 304, a convex guide column 6011 is provided on the outer side of the lock tooth 601, and a guide hole 602 for the guide column 6011 to pass through is provided on the lock plate 6 corresponding to the sliding path of the guide column 6011. The locking portion can slide through the guide column 6011 in the guide hole 602, thereby improving the stability of the lock tooth 601. At the same time, the guide column 6011 and the guide hole 602 have a simple structure, are easy to arrange and implement on the lock tooth 601 and the lock plate 6, and have a good guiding effect.

[0060] The structure of the wire support 304 is as follows: Figure 6 and Figure 8 As shown in the figure, it is roughly in the shape of "8", and the wire-pulling bracket 304 is sleeved on one end of the guide column 6011 extending out of the lock plate 6, and is connected to the lock tooth 601. A limiting protrusion 6013 is also provided at the end of the guide column 6011, and a clamping space for the wire-pulling bracket 304 is formed between the limiting protrusion 6013 and the lock plate 6. Here, the "8"-shaped wire-pulling bracket 304 has two through holes of different sizes that are connected and arranged. The larger through hole is used to sleeve the wire-pulling bracket 304 on the guide column 6011 first, and then by sliding relative to the guide column 6011, the smaller through hole is clamped and maintained outside the guide column 6011 in the above-mentioned clamping space, thereby completing the connection between the wire-pulling bracket 304 and the guide column 6011.

[0061] Here, the two through holes of different specifications on the wire support 304 are used to facilitate the installation of the wire support 304 and the guide column 6011. Preferably, the specifications of the through hole for engaging with the guide column 6011 are adapted to the diameter of the guide column 6011, which is beneficial to the connection effect between the guide column 6011 and the wire support 304. In order to further improve the stability of the wire 3 in use, as shown in FIG. Figure 8As shown in , a wire-passing bracket 305 is fixedly provided on the outer side of the lock plate 6, and the first pivot shaft 102 is arranged through the wire-passing bracket 305, and wire-passing grooves for the wire 3 to pass through are provided at both ends of the wire-passing bracket 305 and the end of the first pivot shaft 102. The wire-passing groove guides the wire 3, which facilitates the guide column 6011 to drive the lock tooth 601 to slide in a preset direction, and drives the lock plate 6 to rotate around the first pivot shaft 102, thereby improving the locking and unlocking effects of the lock tooth 601.

[0062] In this embodiment, when the locking part is in the state of locking the adjusting part and the pull wire 3 is pulled, the pull wire 3, under the guidance of the wire groove on the wire passing bracket 305, through the cooperation of the wire pulling bracket 304 and the guide column 6011, can make the locking tooth 601 retract into the locking plate 6, and can drive the locking plate 6 to rotate in the unlocking direction, thereby releasing the locking of the adjusting part by the locking tooth 601.

[0063] The adjusting part in this embodiment is provided with a plurality of teeth and a plurality of stop posts, and the plurality of teeth and the plurality of stop posts are spaced around the rotation center of the adjusting part, and the teeth are close to the rotation center of the adjusting part relative to the stop posts. As the adjusting part rotates downward relative to the seat cushion frame 1, the locking part can be inserted between one of the stop posts and one of the teeth to lock the adjusting part.

[0064] As a preferred embodiment, the adjustment part includes a backrest connecting plate 4 and an adjustment plate 5 connected to the backrest connecting plate 4, and the teeth and the stopper are arranged on the adjustment plate 5. The adjustment plate 5 and the backrest connecting plate 4 are respectively arranged on the inner and outer sides of the seat cushion frame 1, and the backrest connecting plate 4 is connected to the angle adjuster 204. It should be noted that the backrest connecting plate 4 and the adjustment plate 5 in the adjustment part are also arranged on the left side of the seat to ensure that the height difference between the seat back and the seat cushion frame 1 can be adjusted while the seat back angle is adjusted.

[0065] In terms of specific structure, combined Figures 3 to 5 As shown in the figure, the backrest connecting plate 4 is arranged on the outer side of the seat cushion frame 1 and the backrest frame 2, the top of the backrest connecting plate 4 is connected to the recliner 204, and the bottom is rotatably connected to the seat cushion frame 1 via the second pivot shaft 7. The adjustment plate 5 is arranged on the inner side of the seat cushion frame 1, and the adjustment plate 5 is fan-shaped as a whole, and is also rotatably arranged on the seat cushion frame 1 via the second pivot shaft 7.

[0066] In order to further improve the use effect of the adjustment part, in this embodiment, a limit part is provided on the seat cushion frame 1, and the limit part is used to limit the rotation displacement of the adjustment part. Figure 2 As shown in the figure, the limiting part in this embodiment includes an arc-shaped hole 101 provided on the cushion frame 1, and the adjusting part is configured with a column 401 slidably provided in the arc-shaped hole 101. The column 401 can be formed on the backrest connecting plate 4, and after passing through the adjusting plate 5, it is screwed and connected with the nut 402 to ensure the connection effect.

[0067] During the use of the limiting part, the rotation displacement of the adjustment plate 5 can be limited by the contact between the column 401 and the two ends of the arc hole 101, thereby ensuring the stability and reliability of the adjustment part during use. In addition, by providing the column 401 and the nut 402, the backrest connecting plate 4 and the adjustment plate 5 can be relatively fixed, which is conducive to meeting the requirements of the angle adjustment of the backrest frame 2 and reducing the height difference between the seat cushion frame 1 and the backrest frame 2.

[0068] like Figure 5 As shown in , the teeth are closer to the second pivot axis 7 than the stopper post, wherein the teeth include three teeth arranged from top to bottom around the second pivot axis 7. For the convenience of distinguishing and describing, the three stopper posts are respectively referred to as the first stopper post 505, the second stopper post 506 and the third stopper post 502 in order from top to bottom. The multiple teeth are also arranged from top to bottom around the second pivot axis 7, and the tip of each tooth is arranged alternately between the stopper posts. The teeth located above the first stopper post 505 are referred to as the first teeth 504, and the teeth located below the first teeth 504 are respectively referred to as the second teeth 508, the third teeth 503 and the fourth teeth 507 in order from top to bottom.

[0069] The setting of the blocking column in this embodiment can prevent the lock plate 6 from rotating in the unlocking direction when in the locked state, and is conducive to improving the reliability of the lock tooth 601 when locked. In addition, the structure of the blocking column and the tooth is simple, which is convenient for structural molding on the adjustment plate 5. In particular, when the lock tooth 601 is inserted between the first blocking column 505 and the third tooth 503, and between the second blocking column 506 and the fourth tooth 507, the upper and lower sides of the lock tooth 601 are respectively subjected to the action force of the blocking column and the tooth, and the action of the torsion spring 103, and have a good locking effect.

[0070] In order to improve the use effect of the locking portion, in this embodiment, Figure 6 As shown in the figure, in this embodiment, an arc-shaped guide surface 604 is cleverly provided at the free end of the lock plate 6. After the lock tooth 601 is retracted into the lock plate 6 and continues to rotate in the unlocking direction, the guide surface 604 abuts against the blocking column, which facilitates the lock plate 6 to drive the lock tooth 601 to unlock the locking portion. The guide surface 604 here has a simple structure, is easy to be processed and formed on the adjustment plate 5, and has a good use effect.

[0071] The above-mentioned elastic part is sleeved on the second pivot shaft 7, and the coil spring 701 is located on the other side of the adjustment plate 5 relative to the seat cushion frame 1, and a limiting nut is provided at the end of the second pivot shaft 7. The coil spring 701 is located on the second pivot shaft 7 between the limiting nut and the adjustment plate 5, and one end of the coil spring 701 is connected to the second pivot shaft 7, and the other end is connected to the fixing column 501 protrudingly arranged on the adjustment plate 5.

[0072] The coil spring 701 can store energy when the adjustment plate 5 and the backrest frame 2 rotate downward synchronously, and release the stored energy to drive the adjustment plate 5 back to its original position. The coil spring 701 is a mature product, easy to arrange and implement, and has a good return effect. The setting of the limit nut is conducive to preventing the coil spring 701 from escaping from the second pivot shaft 7, and is conducive to improving the stability of the coil spring 701 in use.

[0073] The structural example of the locking part of the seat back adjustment mechanism described in this embodiment in the sitting position is shown in FIG. Figure 2 In this state, the lock tooth 601 is inserted between the first tooth 504 and the second tooth 508, the first stop post 505 abuts against the bottom of the lock plate 6, and the cam 203 is arranged toward the rear of the seat. At this time, the bottom plate 301 does not receive the push of the cam 203.

[0074] When it is necessary to release the locking of the locking teeth 601 on the adjusting plate 5, the movement directions of the various components refer to Figure 2 As shown by the arrow in , the motor drives the rotating shaft 202 to drive the cam 203 to rotate in the clockwise direction. When the cam 203 rotates from 180° to 270°, the push rod 303 can be lifted upward through the bottom plate 301, and the first spring 302 is compressed to store energy, and the lock tooth 601 is pulled to slide in the unlocking direction through the cooperation of the pull wire 3 and the guide column 6011 until the lock tooth 601 retracts into the lock plate 6. At this time, the second spring 6012 is in a compressed state. At the same time, the lock plate 6 is subjected to the force of the lock tooth 601, which also drives the lock tooth 601 to rotate in the counterclockwise direction. When the cam 203 rotates to 270°, when the bottom plate 301 reaches the highest point of the upward movement, the lock tooth 601 is disengaged from between the first tooth 504 and the second tooth 508, and the lock between the lock tooth 601 and the first tooth 504 and the second tooth 508 is released, thereby completing the unlocking.

[0075] When the adjustment plate 5 is in a free state after unlocking, Figure 4 As shown in FIG. 1 , at this time, the backrest frame 2 is adjusted backward by the angle adjuster 204. Driven by the gravity of the seat back, the movement direction of each component is as follows: Figure 4 As shown by the arrow in the figure. The backrest connecting plate 4 and the adjustment plate 5 can rotate together clockwise with the second pivot shaft 7 as the center, and the coil spring 701 stores energy at this time. When the cam 203 rotates from 270° to 360° and rotates to the initial position again, the first spring 302 releases the stored energy and drives the push rod 303 to return to its original position, and at the same time releases the pulling of the pull wire 3, and the torsion spring 103 drives the lock plate 6 and the lock tooth 601 to rotate clockwise in the direction shown in the figure. When the second spring 6012 drives the lock tooth 601 to extend out of the lock plate 6, the lock tooth 601 can be inserted between the first stop column 505 and the third tooth 503.

[0076] Then the motor drives the cam 203 to continue to rotate, repeating the unlocking action, and continuing to be driven by the gravity of the seat back according to Figure 4 The adjusting plate 5 is rotated in the direction indicated by the middle arrow until the cam 203 is rotated to the initial state again, and the locking tooth 601 can be inserted between the second stop column 506 and the fourth tooth 507. At this time, the backrest frame 2 is in the Fig.12 The third stop post 502 can cooperate with the second stop post 506 to further improve the locking effect in this state.

[0077] When the seat back needs to be adjusted from the flat state to the sitting state, the seat back is adjusted forward by the angle adjuster 204, and the motor rotates in the opposite direction to drive the rotating shaft 202 and the cam 203 to rotate synchronously, so that the push rod 303 slides back and forth along the fixed bracket 201, thereby driving the pull wire 3 and the locking tooth 601 to move, and then the locking tooth 601 and the adjustment plate 5 are locked and unlocked. The adjustment plate 5 returns to its original position under the drive of the coil spring 701 until the locking tooth 601 is locked again between the first tooth 504 and the second tooth 508. At this time, the structure of the seat back adjustment mechanism is as follows Figure 2 as shown in .

[0078] With the seat back adjustment mechanism described in the present embodiment, the unlocking portion can be driven to rotate as the backrest frame 2 is driven to pull the locking portion to move, thereby releasing the lock on the unlocking portion, and due to the gravity of the seat back, the adjustment portion and the backrest frame 2 can be synchronously rotated downward relative to the cushion frame 1, which not only satisfies the seat back angle adjustment requirement, but also helps to eliminate the height difference between the seat back and the seat cushion after being laid flat, thereby helping to improve the comfort of use of the seat when it is laid flat.

[0079] In addition, the present embodiment also relates to a seat, comprising a seat cushion and a backrest, wherein the seat back adjustment mechanism as described above is provided between the seat cushion and the backrest.

[0080] The seat described in this embodiment helps to improve the comfort of the seat by arranging the seat back adjustment mechanism as described above between the seat cushion and the backrest, especially when the seat is used in a vehicle, it helps the occupants to lie down, thereby helping to relieve the fatigue of the occupants during the ride, and has good practicality.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A seat back adjustment mechanism, characterized in that: It comprises an adjusting portion and a locking portion provided on a seat cushion frame (1), and an unlocking portion provided between the adjusting portion and a backrest frame (2); The adjustment part is connected to the backrest frame (2) via an angle adjuster (204), and an elastic part is provided between the adjustment part and the seat cushion frame (1), the elastic part being used to drive the adjustment part to return to its original position after rotation; The locking portion is used to lock the adjusting portion, and is driven to rotate with the backrest frame (2). The unlocking portion can pull the locking portion to move, thereby releasing the lock on the adjusting portion. Driven by the gravity of the seat back, the backrest frame (2) can rotate downward relative to the seat cushion frame (1), and the adjusting portion can rotate upward relative to the seat cushion frame (1), so that the elastic portion can store energy.

2. The seat back adjustment mechanism according to claim 1, characterized in that: The unlocking portion comprises a cam (203), a traction member and a pull wire (3); The cam (203) is sleeved on the rotating shaft (202) of the backrest frame (2) and rotates synchronously with the rotating shaft (202); The traction member is slidably disposed on the backrest frame (2) and abuts against the cam (203) to receive the push of the cam (203); a first elastic member is provided between the traction member and the backrest frame (2), and the first elastic member is used to drive the traction member to return to its original position after sliding; The pull wire (3) is connected between the traction member and the locking portion, and the pull wire (3) can pull the locking portion to move as the traction member slides.

3. The seat back adjustment mechanism according to claim 2, characterized in that: The locking portion is rotatably arranged on the seat cushion frame (1), and a second elastic member is arranged between the locking portion and the seat cushion frame (1), the second elastic member being used to drive the locking portion to return to its original position after rotation.

4. The seat back adjustment mechanism according to claim 3, characterized in that: The locking portion comprises a locking plate (6) rotatably arranged on the seat cushion frame (1), and a locking tooth (601) guide-slidably arranged on the locking plate (6), and the second elastic member is connected between the locking plate (6) and the seat cushion frame (1); The locking tooth (601) is connected to the pull wire (3) and can be inserted into the adjusting portion to lock the position of the adjusting portion. The locking tooth (601) can unlock the adjusting portion and push the locking plate (6) to rotate by receiving the pulling of the pull wire (3). A third elastic member is provided between the locking tooth (601) and the locking plate (6), and the third elastic member is used to drive the locking tooth (601) to return to its original position after sliding.

5. The seat back adjustment mechanism according to claim 4, characterized in that: A wire pulling bracket (304) is slidably provided on the locking plate (6), and the wire pulling bracket (304) is connected between the locking tooth (601) and the wire pulling bracket (3).

6. The seat back adjustment mechanism according to claim 1, characterized in that: The adjusting portion is provided with a plurality of teeth and a plurality of stop posts, the plurality of teeth and the plurality of stop posts are arranged at intervals around the rotation center of the adjusting portion, and the teeth are close to the rotation center of the adjusting portion relative to the stop posts. As the adjusting portion rotates downward relative to the seat cushion frame (1), the locking portion can be inserted between one of the stop posts and one of the teeth to lock the adjusting portion.

7. The seat back adjustment mechanism according to claim 6, characterized in that: The adjustment portion comprises a backrest connecting plate (4) and an adjustment plate (5) connected to the backrest connecting plate (4), wherein the teeth and the stop column are both arranged on the adjustment plate (5); The adjustment plate (5) and the backrest connecting plate (4) are respectively arranged on the inner and outer sides of the seat cushion frame (1), and the backrest connecting plate (4) is connected to the angle adjuster (204).

8. The seat back adjustment mechanism according to any one of claims 1 to 7, characterized in that: The seat cushion frame (1) is provided with a limiting portion, and the limiting portion is used to limit the rotational displacement of the adjusting portion.

9. The seat back adjustment mechanism according to claim 8, characterized in that: The limiting portion comprises an arc-shaped hole (101) provided on the seat cushion frame (1), and the adjusting portion is provided with a column (401) slidably disposed in the arc-shaped hole (101).

10. A chair, comprising a seat cushion and a backrest, characterized in that: A seat back adjustment mechanism according to any one of claims 1 to 9 is provided between the seat cushion and the backrest.

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