Seat with independent zero-gravity adjustment mechanism

Abstract

The present application relates to a seat with independent zero-gravity adjustment mechanism, comprising: a seat cushion frame arranged above a seat base and connected with a seat back assembly; a seat pan for a person to sit on and arranged to be rotatable relative to the seat cushion frame; and a zero-gravity adjustment mechanism hinged between a front end of the seat pan and a front end of the seat cushion frame for lifting or lowering the front end of the seat pan. The present application separates the zero-gravity adjustment mechanism from the traditional five-link force path, so that the force of the three fixed points of the safety belt is not transmitted to the zero-gravity adjustment mechanism, reducing the locking strength requirement of the locking mechanism.

Description

Technical Field

[0001] This invention relates to the field of automotive technology, and in particular to a seat with an independent zero-gravity adjustment mechanism. Background Technology

[0002] Zero-gravity seats are becoming increasingly popular in the market, and more and more vehicles are equipped with them. Traditional zero-gravity seats typically use a five-bar linkage to adjust the seat's tilt and height, meeting the requirements for occupant posture adjustment. However, to ensure occupant safety and comfort, zero-gravity seats generally place all three seatbelt anchor points on the seat itself (the upper anchor point on the backrest, and the two lower anchor points on the seat cushion panel). For example:

[0003] Invention patent CN202110648638.6 discloses a five-link structure for a seat, which uses a five-link configuration to achieve height adjustment and zero-gravity adjustment of the seat. Figure 1 As shown, the five-link structure of this seat includes a base frame 1, a rear link 2 for height adjustment, a seat cushion frame panel 3, and an outer front link 4 and an inner front link 5 for zero-gravity adjustment (i.e., seat cushion tilt adjustment). If all three anchor points of the seat belt are on the seat, the force at all three anchor points will be transmitted through the seat cushion frame to the inner front link 5 for zero-gravity adjustment, requiring high strength for the locking mechanism of the inner front link 5.

[0004] Invention patent CN202110854026.2 discloses a zero-gravity seat frame adjustment system, which also uses a five-bar linkage to achieve seat height adjustment and zero-gravity adjustment. For example... Figure 2 As shown, the five-bar linkage includes a base slide rail bracket 200, a height adjustment linkage 800, a seat frame side plate 110, and a first linkage 300 and a second linkage 400 for zero-gravity adjustment. If all three anchor points of the seat belt are on the seat, the force at all three anchor points will be transmitted through the seat cushion frame to the first linkage 300 for zero-gravity adjustment. The mechanism for locking the first linkage 300 must have a locking strength of at least 4000 Nm.

[0005] In summary, the traditional five-bar linkage structure that achieves high-intensity and zero-gravity adjustment has a relatively heavy overall frame and requires high strength from the locking mechanism, making it impossible to strike a balance between strength and weight. Summary of the Invention

[0006] To address the aforementioned issues, this invention provides a seat with an independent zero-gravity adjustment mechanism. By separating the zero-gravity adjustment structure from the traditional five-bar force path, the forces at the three anchor points of the seatbelt are not transmitted to the zero-gravity adjustment mechanism, thus reducing the locking strength requirements of the locking mechanism.

[0007] The present invention is achieved through the following scheme: a seat with an independent zero-gravity adjustment mechanism, comprising: a seat cushion frame, disposed above the seat base and connected to the seat back assembly; a seat basin for occupants to sit on and configured to rotate relative to the seat cushion frame; and a zero-gravity adjustment mechanism, hinged between the front end of the seat basin and the front end of the seat cushion frame, for raising or lowering the front end of the seat basin.

[0008] A further improvement of the seat with an independent zero-gravity adjustment mechanism of the present invention is that the seat further includes a height adjustment mechanism hinged between the seat base and the seat cushion frame for adjusting the height of the seat cushion frame.

[0009] A further improvement of the seat with an independent zero-gravity adjustment mechanism of the present invention is that the rear end of the seat basin is hinged to the height adjustment mechanism.

[0010] A further improvement of the seat with an independent zero-gravity adjustment mechanism of the present invention is that the height adjustment mechanism includes a front link and a rear link; the first end of the front link is hinged to the seat base and the second end is hinged to the front end of the seat cushion frame; the first end of the rear link is hinged to the seat base and the second end is hinged to the rear end of the seat cushion frame.

[0011] A further improvement of the seat with an independent zero-gravity adjustment mechanism of the present invention is that the rear end of the seat basin is hinged to the rear linkage.

[0012] A further improvement of the seat with an independent zero-gravity adjustment mechanism of the present invention is that the seat cushion frame includes two side plates, a front tube connected between the front ends of the two side plates, and a rear tube connected between the rear ends of the two side plates.

[0013] A further improvement of the seat with an independent zero-gravity adjustment mechanism of the present invention is that the rear end of the seat basin is hinged to the rear tube.

[0014] A further improvement of the seat with an independent zero-gravity adjustment mechanism of the present invention is that the zero-gravity adjustment mechanism includes a zero-gravity adjustment motor, a first lead screw, and a first lead screw sleeve. One of the zero-gravity adjustment motor and the first lead screw sleeve is hinged to the front end of the seat basin, and the other of the zero-gravity adjustment motor and the first lead screw sleeve is hinged to the seat cushion frame. The zero-gravity adjustment motor drives the first lead screw to move the first lead screw sleeve on the first lead screw.

[0015] A further improvement of the seat with an independent zero-gravity adjustment mechanism of the present invention is that the zero-gravity adjustment motor and the other of the first lead screw sleeve are hinged to the front tube.

[0016] A further improvement of the seat with an independent zero-gravity adjustment mechanism of the present invention is that a first mounting bracket is fixedly connected to the front end of the seat basin, a second mounting bracket is fixedly connected to the seat cushion frame, one of the zero-gravity adjustment motor and the first lead screw sleeve is hinged to the first mounting bracket, and the other of the zero-gravity adjustment motor and the first lead screw sleeve is hinged to the second mounting bracket.

[0017] A further improvement of the seat with an independent zero-gravity adjustment mechanism of the present invention is that two first mounting brackets are fixedly connected at intervals to the front end of the seat basin, and a second mounting bracket is fixedly connected to the front tube at a position corresponding to each of the first mounting brackets; the number of zero-gravity adjustment mechanisms is two, and they are respectively hinged between the two pairs of first mounting brackets and the second mounting brackets.

[0018] A further improvement of the seat with an independent zero-gravity adjustment mechanism of the present invention is that a third mounting bracket is fixedly connected to both ends of the front tube; a front connecting rod of the seat is hinged to both sides of the seat basin, and the two front connecting rods of the seat basin are slidably connected to the two third mounting brackets respectively.

[0019] A further improvement of the seat with an independent zero-gravity adjustment mechanism of the present invention is that the third mounting bracket is provided with an elongated groove, and the front connecting rod of the seat basin is provided with a pin, and the pin slides in the elongated groove when the seat basin rotates relative to the seat cushion frame.

[0020] A further improvement of the seat with an independent zero-gravity adjustment mechanism of the present invention is that the front connecting rod of the seat basin is arc-shaped and the opening faces the front tube. When the seat basin is subjected to pressure, the front connecting rod of the seat basin presses on the front tube, restricting the clockwise rotation of the front connecting rod of the seat basin relative to the front tube.

[0021] A further improvement of the seat with an independent zero-gravity adjustment mechanism of the present invention is that the seat further includes a height adjustment mechanism for adjusting the height of the seat cushion frame; the height adjustment mechanism includes a front link and a rear link; a first end of the front link is hinged to the seat base and a second end is hinged to the front end of the seat cushion frame; a first end of the rear link is hinged to the seat base and a second end is hinged to the rear end of the seat cushion frame; the rear tube is fixedly connected to one of the rear link and the side plate, and the rear tube is rotatably connected to the other of the rear link and the side plate.

[0022] A further improvement of the seat with an independent zero-gravity adjustment mechanism of the present invention is that the height adjustment mechanism further includes a height adjustment motor, a second lead screw, and a second lead screw sleeve; the height adjustment motor is hinged to the front end of the front tube or one of the side plates, the end of the second lead screw sleeve is hinged to the first end of the rear connecting rod and / or to the seat base, and the height adjustment motor drives the second lead screw to move the second lead screw sleeve on the second lead screw.

[0023] This invention separates the seat into a seat basin and a seat cushion frame, and isolates the zero-gravity adjustment mechanism from the traditional five-bar linkage force path, forming a three-bar zero-gravity adjustment structure and a four-bar height adjustment structure. On one hand, the zero-gravity adjustment mechanism only adjusts the seat basin, ensuring that the forces at the three seatbelt anchor points on the seat cushion frame and seat back are not transmitted to the zero-gravity adjustment mechanism, thus reducing the locking strength requirements of the zero-gravity adjustment mechanism's locking function. On the other hand, the height adjustment mechanism, while adjusting the height of the seat cushion frame, can simultaneously adjust the height of the seat basin. Furthermore, through the hinge connection between the seat basin and the extension of the rear linkage, the height adjustment mechanism, while adjusting the height of the seat cushion frame, can also drive the seat basin and the zero-gravity adjustment mechanism together, thereby adjusting the tilt angle of the seat basin. Moreover, the four-link height adjustment structure is more efficient than the traditional five-link structure, resulting in a larger angle between the seat and the horizontal at the lowest position and a smaller angle at the highest position, with a wider adjustment range. This allows for more seat posture adjustments. For example, at the highest position with zero gravity adjustment and height adjustment, the angle between the seat and the horizontal is smaller, and the height difference between the rear end of the seat and the seat back is smaller, resulting in better comfort. Attached Figure Description

[0024] Figure 1 A schematic diagram of the first embodiment of a conventional five-bar linkage structure is shown.

[0025] Figure 2 A schematic diagram of a second embodiment of a conventional five-bar linkage structure is shown.

[0026] Figure 3 A perspective view of the first embodiment of the present invention is shown when designing the position and orientation.

[0027] Figure 4 A perspective view of the first embodiment of the present invention in a zero-gravity position is shown.

[0028] Figure 5 An exploded view of the first embodiment of the present invention is shown.

[0029] Figure 6 A perspective view of the first embodiment of the present invention with the sitz bath removed is shown.

[0030] Figure 7 An exploded view of the first embodiment of the present invention with the sitz bath removed is shown.

[0031] Figure 8 It shows Figure 6 Enlarged view of point A.

[0032] Figure 9 A schematic diagram of the combined state of the third mounting bracket, the front tube, and the front connecting rod of the sitz bath in this invention is shown.

[0033] Figure 10 A schematic diagram of the force transmission of the zero-gravity posture F1 of the seat of the present invention is shown.

[0034] Figure 11 A schematic diagram of the force transmission of the seat in zero-gravity posture F2 / F3 according to the present invention is shown.

[0035] Figure 12 The initial posture of the zero-gravity adjustment mechanism in the seat of the present invention and its equivalent schematic diagram are shown.

[0036] Figure 13 The zero-gravity attitude of the zero-gravity adjustment mechanism in the seat of the present invention and its equivalent schematic diagram are shown.

[0037] Figure 14 A schematic diagram showing the force comparison between a second embodiment of a conventional five-bar linkage structure and the seat of the present invention is provided.

[0038] Figure 15 An exploded view of the second embodiment of the present invention is shown.

[0039] Figure 16 A perspective view of the second embodiment of the present invention with the sitz bath removed is shown.

[0040] Figure 17 An exploded view of the second embodiment of the present invention with the sitz bath removed is shown.

[0041] Figure 18 A perspective view of the third embodiment of the present invention with the sitz bath removed is shown.

[0042] Figure 19 An exploded view of the third embodiment of the present invention with the sitz bath removed is shown.

[0043] Figure 20 A schematic diagram comparing the lowest and highest high-key positions of the second / third embodiment of the present invention is shown.

[0044] Figure 21 The diagram shows an equivalent comparison between height adjustment using a conventional four-bar linkage and height adjustment using the second / third embodiment of the present invention.

[0045] Figure 22The diagram shows a comparison of the seat and backrest states after height adjustment using a conventional four-bar linkage and after height adjustment using the second / third embodiment of the present invention.

[0046] Figure 1 In the middle: 1. Base frame; 2. Rear connecting rod; 3. Seat cushion frame panel; 4. Outer front connecting rod; 5. Inner front connecting rod.

[0047] Figure 2 In the middle: 110, seat frame side plate; 200, base slide rail bracket; 300, first connecting rod; 400, second connecting rod; 500, angle adjuster; 800, height adjustment connecting rod;

[0048] Figures 3 to 22 In the middle: 10, seat basin; 11, first mounting bracket; 12, front connecting rod of the seat basin; 121, pin; 13, first rear end bracket; 14, second rear end bracket; 20, seat cushion frame; 21, side plate; 211, third mounting bracket; 2111, long groove; 22, front tube; 221, second mounting bracket; 23, rear tube; 30, seat base; 31, front support; 32, rear support; 40, seat back assembly; 50, height adjustment mechanism; 51, height adjustment motor; 511, second lead screw sleeve; 512, second lead screw; 52, front connecting rod; 53, rear connecting rod; 531, extension section; 532, through hole; 60, zero gravity adjustment mechanism; 61, zero gravity adjustment motor; 62, first lead screw; 63, first lead screw sleeve. Detailed Implementation

[0049] To address the issues of heavy overall frame weight and high strength requirements for locking mechanisms in traditional five-bar linkage structures used for high-adjustment and zero-gravity adjustment, this invention provides a seat with an independent zero-gravity adjustment mechanism. By separating the zero-gravity adjustment structure from the traditional five-bar force path, the forces at the three anchor points of the seatbelt are not transmitted to the zero-gravity adjustment mechanism, thus reducing the locking strength requirements of the locking mechanism. The following detailed description, in conjunction with the accompanying drawings, further illustrates this seat with an independent zero-gravity adjustment mechanism.

[0050] First embodiment: See Figures 3 to 14As shown, a seat with an independent zero-gravity adjustment mechanism includes a seat basin 10, a seat cushion frame 20, and a zero-gravity adjustment mechanism 60. The seat cushion frame 20 is located above the seat base 30 and connected to the seat back assembly 40. It includes two side plates 21, a front tube 22 connecting the front ends of the two side plates 21, and a rear tube 23 connecting the rear ends of the two side plates 21. The seat basin 10 is situated between the two side plates 21 and above the front tube 22 and the rear tube 23, for seating, and is designed to rotate relative to the seat cushion frame 20. The seat basin 10 can have various structural forms, such as a full basin, a U-shaped tube with a steel wire in the middle, or a U-shaped tube with a half basin, etc. The zero-gravity adjustment mechanism 60 is hinged between the front end of the seat basin 10 and the seat cushion frame 20, and is used to raise or lower the front end of the seat basin 10. Specifically, the zero-gravity adjustment mechanism 60 can be hinged to the front tube 22 or the side plates 21. The rear edge of the basin 10 is connected to a first rear end bracket 13 that bends downward into an arc shape. The first rear end bracket 13 rotatably covers the upper half of the rear tube 23.

[0051] For information on zero-gravity adjustment structures, please refer to [link / reference]. Figure 3 , Figure 4 and Figure 7As shown: The zero-gravity adjustment mechanism 60 includes a zero-gravity adjustment motor 61, a first lead screw 62, and a first lead screw sleeve 63. A first mounting bracket 11 is fixedly connected to the front end of the basin 10, and a second mounting bracket 221 is fixedly connected to the front tube 22. The motor mount of the zero-gravity adjustment motor 61 is hinged to the first mounting bracket 11, and the motor shaft of the zero-gravity adjustment motor 61 is drivenly connected to one end of the first lead screw 62. The first lead screw sleeve 63 is screwed onto the first lead screw 62 and hinged to the second mounting bracket 221. The zero-gravity adjustment motor 61 drives the first lead screw 62, causing the first lead screw sleeve 63 to move on the first lead screw 62. Specifically, the first mounting bracket 11 is U-shaped and welded to the bottom front end of the seat basin 10, forming an installation space between them. Hinge holes are provided on both side plates of the first mounting bracket 11. The motor mount of the zero-gravity adjustment motor 61 is inserted into this installation space and hinged to the two hinge holes of the first mounting bracket 11 on both sides via hinge members. The second mounting bracket 221 includes two hinge plates. An arc-shaped welding port is provided at the top of each hinge plate, and the plate is welded and fixed to the lower half of the front tube 22 at the arc-shaped welding port. A clamping space is formed between the two hinge plates, and hinge holes are provided opposite each other on the two hinge plates. The first lead screw sleeve 63 is placed between the two hinge plates, and both sides of the first lead screw sleeve 63 are hinged to the two hinge holes of the second mounting bracket 221 via hinge members. In some embodiments, the motor mount of the zero-gravity adjustment motor 61 can be hinged to the second mounting bracket 221, while the first lead screw sleeve 63 can be hinged to the first mounting bracket 11. (See reference...) Figure 8 and Figure 11 As shown, when the seat is in a zero-gravity posture, the zero-gravity adjustment mechanism 60 needs to bear all the forces at the front end of the seat basin 10 (including force F1 in the middle, force F2 on the left, and force F3 on the right), which places very high demands on the load-bearing capacity of the zero-gravity adjustment mechanism 60. Based on this, this embodiment improves upon the aforementioned structure, in conjunction with… Figures 4 to 7As shown, the front tube 22 is also fixedly connected to both ends of a third mounting bracket 211; the front sides of the basin 10 are hinged with basin front connecting rods 12, and the two basin front connecting rods 12 are slidably connected to the two third mounting brackets 211 respectively, and the third mounting brackets 211 are provided with long grooves 2111, and the basin front connecting rods 12 are provided with pins 121. When the zero gravity adjustment mechanism 60 adjusts the tilt angle of the basin 10, the basin 10 rotates relative to the seat frame 20, the front end of the basin 10 is raised or lowered, and the pin 121 slides in the long groove 2111. By setting the front connecting rod 12 of the seat, when the seat is in a zero-gravity posture, the forces F2 and F3 at the front end of the seat 10 will be transmitted through the seat 10 to the two front connecting rods 12 of the seat, and then transmitted by the two front connecting rods 12 of the seat to the third mounting bracket 211 and the front tube 22, which ensures the rigidity and strength of the left and right sides of the seat assembly and disperses the force on the zero-gravity adjustment mechanism 60.

[0052] Better location: See Figure 6 , Figure 8 and Figure 9 As shown, the front connecting rod 12 of the seat is generally arc-shaped, and when the seat 10 is in the initial design position, the opening of the front connecting rod 12 faces the front tube 22. When the front connecting rod 12 is subjected to pressure, it presses against the front tube 22, and the force is directly transmitted to the side plate 21 through the front tube 22, which restricts the clockwise rotation of the front connecting rod 12 relative to the front tube 22, forming a self-locking structure. This structure can ensure the rigidity and strength of both sides of the seat assembly.

[0053] For a better option, see [link / reference] Figures 5 to 7As shown: The seat also includes a height adjustment mechanism 50, hinged between the seat base 30 and the seat cushion frame 20, for adjusting the height of the seat cushion frame 20. The rear end of the seat basin 10 is hinged to the height adjustment mechanism 50. Specifically, the height adjustment mechanism 50 includes a front link 52 and a rear link 53. In this embodiment, there are two height adjustment mechanisms 50, which are respectively disposed on the opposite inner sides of the two side plates 21. The first ends of the two front links 52 are hinged to the front end of the seat base 30, which is an H-shaped slide rail base. The front ends of the H-shaped slide rail base are respectively connected to front supports 31 for the first ends of the two front links 52 to hinge. The second ends of the two front links 52 are hinged to the front end of the seat cushion frame 20, and in this embodiment, are respectively hinged to the inner front ends of the two side plates 21. The first ends of the two rear connecting rods 53 are hinged to the seat base 30, and the second ends are hinged to the rear end of the seat cushion frame 20. In this embodiment, the rear tube 23 is fixedly (or rotatably) connected to the second end of the rear connecting rod 53, and the rear tube 23 is rotatably (or fixedly) connected to the side plate 21. The rear end of the seat basin 10 is hinged to the rear connecting rod 53. Further, each height adjustment mechanism 50 also includes a height adjustment motor 51, a second lead screw 512, and a second lead screw sleeve 511. The motor mounts of the two height adjustment motors 51 are respectively hinged to the inner front end of the two side plates 21 (or both can be hinged to the front tube 22). In the case where a third mounting bracket 211 is provided, the motor mount is hinged to the third mounting bracket 211 on the corresponding side, while the front connecting rod 52 is directly hinged to the side plate 21 on the corresponding side, and the front connecting rod 12 of the seat basin is sandwiched between the front connecting rod 52 and the third mounting bracket 211. The motor shaft of the height-adjustable motor 51 is drivenly connected to one end of the second lead screw 512. The second lead screw sleeve 511 is screwed onto the second lead screw 512, and the end of the second lead screw sleeve 511 is hinged to the first end of the rear connecting rod 53. The second lead screw sleeve 511 and / or the rear connecting rod 53 are hinged to the rear end of the H-shaped slide rail base. The rear ends of the H-shaped slide rail base are respectively connected to rear supports 32 for the aforementioned hinges. The height-adjustable motor 51 drives the second lead screw 512, causing the second lead screw sleeve 511 to move on the second lead screw 512. This embodiment improves the height adjustment load-bearing capacity by setting two height adjustment mechanisms 50, ensuring the stability of the seat cushion assembly height adjustment. It is suitable for situations where all three fixing points of the seat belt are set on the seat. If not all three fixing points of the seat belt are set on the seat, a height adjustment mechanism 50 can be set and positioned in the middle between the two side plates 21. The first end of the front link 52 and the motor mount of the height adjustment motor 51 can be hinged to the front tube 22 through a bracket.

[0054] This embodiment is not limited to the height adjustment structure described above. Other four-bar height adjustment structures can also be used, such as the height adjustment structures disclosed in patents CN117246198A, CN117022074A, CN117227593A, CN115723639A, CN218453337U, and CN112895988A.

[0055] This embodiment separates the seat cushion assembly into a seat basin 10 and a seat cushion frame 20, and removes the zero-gravity adjustment mechanism from the traditional five-bar linkage, forming a three-bar zero-gravity adjustment structure and a four-bar height adjustment structure. Specifically, as... Figure 12 and Figure 13 As shown, the zero-gravity adjustment structure is essentially a three-bar linkage consisting of a seat base 30, a seat basin 10, and a zero-gravity adjustment mechanism 60. The zero-gravity adjustment motor 61 drives the first lead screw 62 to rotate, changing the distance between hinge points a and b. This causes the seat basin 10 to rotate vertically relative to the seat cushion frame 20 with the rear tube 23 as the axis (i.e., the position indicated by point c), thus achieving zero-gravity adjustment. By separating the zero-gravity adjustment mechanism, it allows zero-gravity adjustment only for the seat basin. This ensures that the forces acting on the three fixed points on the seat are not transmitted to the zero-gravity adjustment mechanism, significantly reducing the locking strength requirements for the locking function of the zero-gravity adjustment mechanism. (Specific details omitted for brevity.) Figure 14 As shown in the figure, the left view illustrates the force diagram of the seat cushion assembly in the second embodiment of the conventional five-bar linkage structure, and the right view illustrates the force diagram of the seat cushion assembly in this embodiment. The seat experiences forces from the three seatbelt anchor points and the force exerted by the occupant. Let F4 be the force at the seatbelt anchor point on the seat back assembly 40, F5 and F6 be the forces at the two seatbelt lower anchor points on the left and right side panels 21 of the seat cushion frame 20, and F7 be the force exerted by the occupant. The transmission paths of forces F4 to F7 are as follows:

[0056] 1. For traditional five-bar linkage structures:

[0057] F4 Force Transmission: Seat Backrest Assembly 40 → Seat Frame Side Plate 110 → Second Link 400 → First Link 300 → Adjuster 500.

[0058] Force transmission for F5, F6, and F7: Seat frame side plate 110 → Second link 400 → First link 300 → Angle adjuster 500.

[0059] 2. Regarding the structure of the three-link zero-gravity adjustment + four-link height adjustment in this embodiment:

[0060] F4 Force Transmission: Seat back assembly 40 → Seat frame side plate 21 → (Front tube 22 → Third mounting bracket 211) → Height adjustment motor 51 and front linkage 52.

[0061] Force transmission for F5 and F6: Seat frame side plate 21 → (front tube 22 → third mounting bracket 211) → height adjustment motor 51 and front connecting rod 52.

[0062] F7 Force transmission: Sink 10 → (First mounting bracket 11) → Zero gravity adjustment motor 60.

[0063] As can be seen from the above force transmission comparison, by adopting this embodiment, the locking strength of the three-bar zero-gravity adjustment mechanism can be directly reduced by 75%. Moreover, raising or lowering the front end of the seat basin 10 alone does not change the seat back assembly 40.

[0064] like Figure 20 and Figure 21 As shown, this height adjustment structure adjusts the height of the seat cushion frame 20 in a manner equivalent to the height adjustment of a traditional four-bar linkage structure. Figure 20 and Figure 21 As shown in Figure (a), the seat frame 20 is essentially composed of a seat base 30, a seat cushion frame 20, a front link 52, and a rear link 53. The height adjustment motor 51 drives the second lead screw sleeve 511 to move, thereby changing the distance between the hinge point between the height adjustment motor 51 and the third mounting bracket 211, and the hinge point between the second lead screw sleeve 511 and the rear link 53. This affects the angles of the front link 52 and the rear link 53, thus achieving height adjustment of the seat cushion frame 20. Figure 20 In the diagram, (A) corresponds to the lowest high-key position, and (B) corresponds to the highest high-key position. Since the front end of the seat 10 is connected to the front tube 22 via the zero-gravity adjustment mechanism 60, and the rear end of the seat 10 is rotatably engaged with the rear tube 23, the movement of the third mounting bracket 211 drives the movement of the front tube 22. This movement of the front tube 22 will then link the seat 10 in two ways, specifically as follows: Figure 20 and 21 As shown in Figure (b): On one hand, the movement of the front tube 22 drives the seat basin 10 to move via the second mounting bracket 221, the zero-gravity adjustment motor 51, and the first mounting bracket 11; on the other hand, the movement of the front tube 22 drives the side plate 21 to move, which in turn drives the rear tube 23 to move, and the movement of the rear tube 23 in turn drives the seat basin 10 to move. Therefore, in the case of a conventional seat assembly where the seat basin and seat frame are not separated, Figure 21 In Figure (a), 20 represents the entire seat basin and cushion frame. Under this structure, the height adjustment range using a four-bar height adjustment mechanism is △H1. However, this solution separates the cushion assembly into the seat basin and cushion frame, and the adjustment mechanism is divided into a three-bar zero-gravity adjustment + a four-bar height adjustment. Under this structure, the height adjustment range is △H2. As can be seen from the comparison diagram, △H2 > △H1, α3-α4 > α1-α2, thus improving the height adjustment efficiency.

[0065] Second embodiment: See Figures 15 to 17 As shown, the difference between this embodiment and the first embodiment is that the second end of the rear connecting rod 53 extends away from the first end to form an extension section 531, the first rear end bracket 13 of the seat basin 10 is replaced with two second rear end brackets 14, the two second rear end brackets 14 are respectively fixed on both sides of the rear end of the seat basin 10, the two second rear end brackets 14 are hinged to the ends of the two extension sections 531, and the rear connecting rod 53 is provided with a through hole 532 near the extension section 531 for the rear tube 23 to pass through and connect.

[0066] Third embodiment: See Figure 18 and Figure 19 As shown, the difference between this embodiment and the second embodiment is that the seat cushion assembly does not have a front connecting rod 12 for the basin. Two first mounting brackets 11 are fixedly connected at intervals to the front end of the basin 10, and a second mounting bracket 221 is fixedly connected to the front tube 22 at the position corresponding to each of the first mounting brackets 11. There are two zero-gravity adjustment mechanisms 60, each hinged between one of the pairs of first mounting brackets 11 and the other of the pair of second mounting brackets 221. By providing two zero-gravity adjustment mechanisms 60 to distribute the force on the basin 10, the front connecting rod 12 is unnecessary. In some embodiments, the two first mounting brackets 11 can be located at both ends of the front end of the basin 19, while the two second mounting brackets 221 can be optionally fixed to the two side plates 21.

[0067] Both the second and third embodiments have an extension section 531 on the rear connecting rod 53. By providing a second rear end bracket 14 at the rear end of the seat 10, and hinged to the extension section 531, the height adjustment range of the seat 10 is increased. Specifically, as shown below... Figure 20 and Figure 21 As shown in Figure (b), the extension section 531 can further lift the seat 10, contributing up to 25 mm of high-adjustment travel.

[0068] This invention separates the seat cushion assembly into a seat basin and a seat cushion frame, and isolates the zero-gravity adjustment mechanism from the traditional five-bar linkage, forming a three-bar zero-gravity adjustment structure and a four-bar height adjustment structure. This allows for independent zero-gravity adjustment of the seat basin, as well as height adjustment via linkage with the seat cushion frame, with a wider height adjustment range. It also saves Z-axis space, meeting the Z-axis space requirements of low-block seats. After connecting the seat back assembly 40, the seat basin 10 and the seat back assembly 40 can be nearly on the same plane, such as... Figure 22 As shown in Figure (b), Figure 22 Figure (a) shows the effect of adjustment using a traditional five-bar linkage structure.

[0069] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. Those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A seat with an independent zero-gravity adjustment mechanism, characterized in that, include: The seat cushion frame is located above the seat base and connected to the seat back assembly; A sitz bath for seating and configured to rotate relative to the seat frame; A zero-gravity adjustment mechanism, hinged between the front end of the seat basin and the front end of the seat cushion frame, is used to raise or lower the front end of the seat basin; a height adjustment mechanism, hinged between the seat base and the seat cushion frame, is used to adjust the height of the seat cushion frame; wherein, The height adjustment mechanism includes a front link and a rear link. The first end of the front link is hinged to the seat base and the second end is hinged to the front end of the seat cushion frame. The first end of the rear link is hinged to the seat base and the second end is hinged to the rear end of the seat cushion frame. The second end of the rear link extends away from the first end to form an extension section. The rear end of the seat is hinged to the end of the extension section. This allows the height adjustment mechanism to adjust the height of the seat cushion frame while simultaneously driving the seat and the zero-gravity adjustment mechanism to work together, thereby adjusting the tilt angle of the seat.

2. The seat with an independent zero-gravity adjustment mechanism as described in claim 1, characterized in that, The rear end of the basin is hinged to the height adjustment mechanism.

3. The seat with an independent zero-gravity adjustment mechanism as described in claim 1, characterized in that, The seat frame includes two side plates, a front tube connected between the front ends of the two side plates, and a rear tube connected between the rear ends of the two side plates.

4. The seat with an independent zero-gravity adjustment mechanism as described in claim 3, characterized in that, The zero-gravity adjustment mechanism includes a zero-gravity adjustment motor, a first lead screw, and a first lead screw sleeve. One of the zero-gravity adjustment motor and the first lead screw sleeve is hinged to the front end of the seat basin, and the other of the zero-gravity adjustment motor and the first lead screw sleeve is hinged to the seat cushion frame. The zero-gravity adjustment motor drives the first lead screw to move the first lead screw sleeve on the first lead screw.

5. The seat with an independent zero-gravity adjustment mechanism as described in claim 4, characterized in that, The zero-gravity adjustment motor and the other of the first lead screw sleeve are hinged to the front tube.

6. The seat with an independent zero-gravity adjustment mechanism as described in claim 4, characterized in that, The front end of the seat basin is fixedly connected to a first mounting bracket, and the seat cushion frame is fixedly connected to a second mounting bracket. One of the zero-gravity adjustment motor and the first lead screw sleeve is hinged to the first mounting bracket, and the other of the zero-gravity adjustment motor and the first lead screw sleeve is hinged to the second mounting bracket.

7. The seat with an independent zero-gravity adjustment mechanism as described in claim 6, characterized in that, The front end of the basin is fixedly connected to two first mounting brackets at intervals, and the front tube is fixedly connected to a second mounting bracket at a position corresponding to each of the first mounting brackets; there are two zero-gravity adjustment mechanisms, which are respectively hinged between the two pairs of first mounting brackets and second mounting brackets.

8. The seat with an independent zero-gravity adjustment mechanism as described in claim 3, characterized in that, The front tube is also fixedly connected to two third mounting brackets at both ends; both sides of the basin are hinged with basin front connecting rods, and the two basin front connecting rods are slidably connected to the two third mounting brackets respectively.

9. The seat with an independent zero-gravity adjustment mechanism as described in claim 8, characterized in that, The third mounting bracket is provided with a long groove, and the front connecting rod of the seat is provided with a pin. When the seat rotates relative to the seat frame, the pin slides in the long groove.

10. The seat with an independent zero-gravity adjustment mechanism as described in claim 8, characterized in that, The front connecting rod of the seat is generally arc-shaped and the opening faces the front tube. When the seat is under pressure, the front connecting rod presses on the front tube, restricting the front connecting rod from rotating clockwise relative to the front tube.

11. The seat with an independent zero-gravity adjustment mechanism as described in claim 3, characterized in that, The seat also includes a height adjustment mechanism for adjusting the height of the seat cushion frame; the height adjustment mechanism includes a front link and a rear link; the first end of the front link is hinged to the seat base and the second end is hinged to the front end of the seat cushion frame; the first end of the rear link is hinged to the seat base and the second end is hinged to the rear end of the seat cushion frame; the rear tube is fixedly connected to one of the rear link and the side plate, and the rear tube is rotatably connected to the other of the rear link and the side plate.

12. The seat with an independent zero-gravity adjustment mechanism as described in claim 11, characterized in that, The height adjustment mechanism further includes a height adjustment motor, a second lead screw, and a second lead screw sleeve; the height adjustment motor is hinged to the front end of the front tube or one of the side plates, the end of the second lead screw sleeve is hinged to the first end of the rear connecting rod and / or to the seat base, and the height adjustment motor drives the second lead screw to move the second lead screw sleeve on the second lead screw.

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