Foldable and zero-pressure seat

Abstract

The utility model provides a foldable zero-pressure seat which comprises a seat cushion framework, the front end of a seat cushion framework assembly of the seat cushion framework is sequentially hinged with an upper front connecting rod, a lower front connecting rod and a seat cushion mounting bracket, and the rear end of the seat cushion framework assembly is sequentially hinged with a rear connecting rod and the seat cushion mounting bracket; an angle driving device is arranged at the two hinged joints so as to drive the seat to be switched among a conventional posture, a zero-pressure posture and a folding posture; in a conventional posture, the rear connecting rod is inclined backwards, and the lower front connecting rod is inclined; in the zero-pressure posture, the rear end and the front end of the seat cushion framework are higher than the seat cushion framework in the conventional posture; in the process of switching to the folding posture, the lower front connecting rod is driven to rotate, the rear connecting rod is driven to incline forwards, and the upper front connecting rod is driven to rotate relative to the lower front connecting rod. According to the seat, on the basis of a five-connecting-rod structure, the rotation range of the seat cushion framework is more flexible, zero-gravity position adjustment, forward folding of the seat cushion and height adjustment of the rear end of the seat cushion are achieved, and meanwhile the problem that a backrest abuts against the waist at the zero-gravity position is solved.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Chinese Utility Model Patent Application No. 202422189425.3, filed September 6, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The utility model belongs to the field of automobile seats, and particularly relates to a foldable zero-pressure seat. BACKGROUND

[0004] In order to alleviate the discomfort of long sitting, zero-pressure seats have been introduced on the market to meet the comfort needs of passengers, wherein, in order to meet the height adjustment of the seat, a series of movement mechanisms need to be set to realize the height adjustment and multi-angle inclination of the seat cushion.

[0005] For example, the Chinese patent document with the authorization announcement number CN219306336U discloses a height adjustment mechanism of a seat, which is used for a four-link seat structure, and the height adjustment mechanism comprises a seat cushion and an electric screw rod mechanism. The seat cushion is hinged on a seat cushion support through a front link and a rear link. The seat cushion is matched with the rear link through a push rod motor, the push rod motor is connected with an upper support of a slide rail at the other end, and the height adjustment function is realized. The front link can realize zero-pressure adjustment through an angle adjuster motor. However, the specific setting of the backrest and the working mode setting of the corresponding seat are not disclosed. Generally, the angle formed by the folding of the seat and the backrest is large, and the folding function cannot be realized.

[0006] The Chinese patent document with the authorization announcement number CN219544549U discloses a five-link adjustable seat, which comprises a slide rail, a rear link, a wall plate, an outer front link and an inner front link. The bottom ends of the rear link and the inner front link are respectively pivoted to the slide rail, and the top ends of the rear link and the outer front link are respectively pivoted to the wall plate. The adjustable seat further comprises a gear motor for driving the rear link through a rack. The gear motor is installed on the slide rail. The angle rotation function is realized through the cooperation of the gear motor and the rack and the hinge of the rack and the link. The front link of the adjustable seat can realize zero-pressure adjustment through an angle adjuster motor while realizing the height adjustment function of the seat. In addition, the specific setting of the backrest and the working mode setting of the corresponding seat are not disclosed. Generally, the angle formed by the folding of the seat and the backrest is large, and the folding function cannot be realized.

[0007] The Chinese patent document with the authorization publication number CN217396316U discloses a foldable and reclining seat frame, which is pushed up by a push rod motor cooperating with a rear connecting rod at one end and fixed with a front connecting rod at the other end. However, on the one hand, the front connecting rod and the rear connecting rod are linked, and the zero pressure function cannot be realized, on the other hand, the backrest is connected with the upper support of the slide rail, but since the folding is realized by arranging the backrest rotation point high, in order to realize the folding of the backrest, it will cause the backrest to seriously top the waist when lying down, reducing the comfort.

[0008] In summary, the current seat cannot perfectly realize the folding function and the zero pressure function, which will cause a large folding angle or serious waist top when lying down. Practical new type content

[0009] The utility model discloses a seat can be folded and can be zero pressure to make three functions of zero gravity position adjustment, seat cushion forward folding, seat cushion rear end height adjustment can be realized, prevent the backrest when zero gravity top waist.

[0010] In order to realize the above-mentioned purpose, a foldable and zero pressure seat, characterized in that, including seat cushion framework, the front end of seat cushion frame assembly is hinged with upper front connecting rod, lower front connecting rod and seat cushion mounting support in turn, the rear end of seat cushion frame assembly is hinged with one end of rear connecting rod, and the other end of rear connecting rod is hinged with the seat cushion mounting support, to form a hinged node, angle driving devices are arranged at the two hinged nodes of the seat cushion framework, to drive the seat to switch between normal posture, zero pressure posture and folding posture, in normal posture, the rear connecting rod is inclined backward, and the lower front connecting rod is inclined, in zero pressure posture, the angles of the rear connecting rod and the lower front connecting rod make the rear end and the front end of the seat cushion frame assembly higher than the rear end and the front end of the seat cushion frame assembly in normal posture, in the process of switching from normal posture and zero pressure posture to folding posture, the angle driving device drives the lower front connecting rod to rotate relative to the seat cushion mounting support, at the same time, the angle driving device drives the rear connecting rod to incline forward, and through the seat cushion frame assembly, drives the upper front connecting rod to rotate relative to the lower front connecting rod.

[0011] The angle driving devices are respectively used for driving the first hinged node and the second hinged node, the angle driving device used for driving the first hinged node directly or indirectly adjusts the angle of the lower front connecting rod, and the angle driving device used for driving the second hinged node directly or indirectly adjusts the angle of the rear connecting rod.

[0012] The first hinged node is the hinged node between the seat cushion mounting support and the lower front connecting rod, the hinged node between the lower front connecting rod and the upper front connecting rod or the hinged node between the seat cushion frame assembly and the upper front connecting rod, and the second hinged node is the hinged node between the seat cushion mounting support and the rear connecting rod or the hinged node between the seat cushion frame assembly and the rear connecting rod.

[0013] The angle driving device for driving the first hinged joint comprises one of the following:

[0014] a1) an angle adjuster arranged at the first hinged joint;

[0015] a2) a stepped bolt arranged at the first hinged joint and a direct-connection motor for driving the stepped bolt to rotate, the stepped bolt and the direct-connection motor being fixed relative to different mechanisms hinged on two sides of the first hinged joint respectively;

[0016] a3) a rack and pinion motor, one of the two opposite rotatable mechanisms hinged on two sides of the first hinged joint being provided with a rack joint node hinged with one end of the rack and spaced apart from the first hinged joint, and the other being fixedly provided with the pinion motor and having a gear on an output shaft of the pinion motor meshing with the teeth of the rack;

[0017] a4) a push rod motor, one of the two opposite rotatable mechanisms hinged on two sides of the first hinged joint being fixedly provided with a fixed end of the push rod motor, and the other being provided with a push rod motor joint node hinged with a movable end of the push rod motor and spaced apart from the first hinged joint.

[0018] When the angle driving device for driving the first hinged joint comprises a rack and pinion motor and the first hinged joint is a hinged joint between a seat cushion mounting bracket and a lower front link, the rack joint node is arranged on one of the seat cushion mounting bracket and the lower front link, and the pinion motor is arranged on the other of the seat cushion mounting bracket and the lower front link.

[0019] The angle driving device for driving the second hinged joint comprises one of the following:

[0020] b1) an angle adjuster arranged at the second hinged joint;

[0021] b2) a stepped bolt arranged at the second hinged joint and a direct-connection motor for driving the stepped bolt to rotate, the stepped bolt and the direct-connection motor being fixed relative to different mechanisms hinged on two sides of the second hinged joint respectively;

[0022] b3) a rack and pinion motor, one of the two opposite rotatable mechanisms hinged on two sides of the second hinged joint being provided with a rack joint node hinged with one end of the rack and spaced apart from the second hinged joint, and the other being fixedly provided with the pinion motor and having a gear on an output shaft of the pinion motor meshing with the teeth of the rack;

[0023] b4) a push rod motor, one of the two opposite rotatable mechanisms to which the second articulation node is articulated has a fixed end of the push rod motor fixedly installed thereon, and the other has a push rod motor articulation point articulated with a movable end of the push rod motor and spaced apart from the second articulation node.

[0024] When the angle driving device for driving the second articulation node comprises a rack and pinion motor and the second articulation node is an articulation node between the seat cushion mounting bracket and the rear link, the rack articulation node is arranged on one of the seat cushion mounting bracket and the rear link, and the pinion motor is arranged on the other.

[0025] For the angle driving device using the angle adjuster, it further comprises a synchronization rod inserted into the shaft center of the angle adjuster and an angle adjuster motor, a driving shaft of the angle adjuster motor is used to drive the corresponding synchronization rod to rotate, thereby driving the shaft center of the angle adjuster to rotate.

[0026] Teeth are arranged on the driving shaft of the angle adjuster motor and the outer side of the synchronization rod and mesh with each other, and the driving shaft of the angle adjuster motor drives the synchronization rod to rotate through the meshing between the driving shaft of the angle adjuster motor and the synchronization rod.

[0027] For the angle driving device using the push rod motor, the push rod motor articulation point is located below the corresponding first or second articulation node, or the push rod motor articulation point is articulated with the push rod motor through a segment of articulation rod, so that the main shaft of the push rod motor is located below the corresponding first or second articulation node of the push rod motor articulation point; or the push rod motor articulation point is located above the corresponding first or second articulation node, or the push rod motor articulation point is articulated with the push rod motor through a segment of articulation rod, so that the main shaft of the push rod motor is located above the corresponding first or second articulation node of the push rod motor articulation point.

[0028] The foldable zero-pressure seat further comprises an adjustable backrest framework arranged separately from the seat cushion framework; in a normal posture, the adjustable backrest framework is at a first backrest angle of backward inclination; in a zero-pressure posture, the adjustable backrest framework is at a second backrest angle of backward inclination and the inclination angle is greater than the first backrest angle, and the lower part is flush with the rear end of the seat cushion framework; in a folded posture, the adjustable backrest framework is at a third backrest angle of forward inclination.

[0029] The foldable zero-pressure seat further comprises a safety belt, the lower fixed point and the buckle mounting point of the safety belt are both located on the two sides of the seat cushion mounting bracket, and the upper fixed point of the safety belt is located on the side of the adjustable backrest framework.

[0030] The foldable zero-pressure seat improves the driving mode of the angle driving device on the basis of the five-connecting-rod structure, makes the rotation range of the seat cushion framework more flexible, makes three functions of zero-gravity position adjustment, seat cushion forward folding and seat cushion rear end height adjustment all be realized, simultaneously prevents the backrest top waist problem of the zero-gravity position, and further realizes the zero-gravity posture, folding posture, conventional posture and other postures in cooperation with the backrest. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 In some embodiments, the foldable zero-pressure seat of the utility model is the overall structural diagram in the conventional state.

[0032] Figure 2 In some embodiments, the foldable zero-pressure seat of the utility model is the frame position schematic diagram in the conventional state.

[0033] Figure 3 In some embodiments, the foldable zero-pressure seat of the utility model is the overall structural diagram in the zero-pressure state.

[0034] Figure 4 In some embodiments, the foldable zero-pressure seat of the utility model is the frame position schematic diagram in the zero-pressure state.

[0035] Figure 5 In some embodiments, the foldable zero-pressure seat of the utility model is the overall structural diagram in the folding state.

[0036] Figure 6 In some embodiments, the foldable zero-pressure seat of the utility model is the frame position schematic diagram in the folding state.

[0037] Figures 7-9 In some embodiments, the foldable zero-pressure seat of the utility model is the frame position schematic diagram in the conventional state, the zero-pressure state and the folding state.

[0038] Figures 10-12 In some embodiments, the foldable zero-pressure seat of the utility model is the installation position schematic diagram of the safety belt lower fixing point and the buckle installation point in the conventional state, the zero-pressure state and the folding state.

[0039] Figure 13 In some embodiments, the foldable zero-pressure seat of the utility model is the schematic diagram of the moving mode of the safety belt lower fixing point and the buckle in the state transformation.

[0040] Figure 14 In some embodiments, the foldable zero-pressure seat of the utility model is the specific structure diagram of the buckle installation point.

[0041] Figure 15 is a specific structure diagram of the safety belt lower fixing point of the foldable zero-pressure seat.

[0042] Figure 16 is an explosion diagram of the adjustable seat cushion framework of the foldable zero-pressure seat according to an embodiment of the utility model.

[0043] Figure 17 is a left piece and connecting rod of the seat cushion mounting support of the adjustable seat cushion framework of the foldable zero-pressure seat as shown in Figure 16 .

[0044] Figure 18 is a right piece and connecting rod of the seat cushion mounting support of the adjustable seat cushion framework of the foldable zero-pressure seat as shown in Figure 16 .

[0045] Figure 19 is an overall structure diagram of the seat cushion framework assembly of the adjustable seat cushion framework of the foldable zero-pressure seat as shown in Figure 16 .

[0046] Figure 20 is an explosion diagram of the seat cushion framework assembly of the adjustable seat cushion framework of the foldable zero-pressure seat as shown in Figure 16 .

[0047] Figure 21 is an explosion diagram of the adjustable seat cushion framework of the foldable zero-pressure seat according to another embodiment of the utility model.

[0048] Figure 22 is a left piece and connecting rod of the seat cushion mounting support of the adjustable seat cushion framework of the foldable zero-pressure seat as shown in Figure 21 .

[0049] Figure 23 is a right piece and connecting rod of the seat cushion mounting support of the adjustable seat cushion framework of the foldable zero-pressure seat as shown in Figure 21 .

[0050] Figure 24 is an explosion diagram of the left piece and direct connection motor mounting structure of the seat cushion mounting support of the adjustable seat cushion framework of the foldable zero-pressure seat as shown in Figure 21 .

[0051] Figure 25 is an overall structure diagram of the seat cushion framework assembly of the adjustable seat cushion framework of the foldable zero-pressure seat as shown in Figure 21 .

[0052] Figure 26 is an explosion diagram of the seat cushion framework assembly of the adjustable seat cushion framework of the foldable zero-pressure seat as shown in Figure 21 .

[0053] Figure 27 is an exploded view of the adjustable cushion frame of the foldable zero-pressure seat according to another embodiment of the present utility model.

[0054] Figure 28 is a side view structure diagram of the adjustable cushion frame of the foldable zero-pressure seat according to another embodiment of the present utility model in a normal posture.

[0055] Figure 29 is a side view structure diagram of the adjustable cushion frame of the foldable zero-pressure seat according to another embodiment of the present utility model in a folded posture. Figure 28

[0056] Figure 30 is a partial enlarged view of the gear motor and the rack of the foldable zero-pressure seat according to another embodiment of the present utility model, which shows the matching principle of the gear motor and the rack. Figure 28

[0057] Figure 31 is a principle diagram of the gear rack driving assembly of the foldable zero-pressure seat according to another embodiment of the present utility model.

[0058] Figure 32 is a principle diagram of the gear rack driving assembly of the foldable zero-pressure seat according to another embodiment of the present utility model.

[0059] Figure 33 is a side view structure diagram of the adjustable cushion frame of the foldable zero-pressure seat according to another embodiment of the present utility model in a normal posture.

[0060] Figure 34 is a partial enlarged view of Figure 33 .

[0061] Figure 35 is an exploded view of the adjustable cushion frame of the foldable zero-pressure seat according to another embodiment of the present utility model.

[0062] Figure 36 is an exploded view of the gear rack driving assembly of the adjustable cushion frame of the foldable zero-pressure seat according to another embodiment of the present utility model. Figure 35

[0063] is a side view of the adjustable cushion frame of the foldable zero-pressure seat according to another embodiment of the present utility model, which shows the push rod motor. Figure 37 Figure 35 is a principle diagram of the gear rack driving assembly and the push rod motor of the adjustable cushion frame of the foldable zero-pressure seat according to another embodiment of the present utility model.

[0064] Figure 38 Figure 35 ​​​​​

[0065] Figure 39 This is a side view of the adjustable seat cushion frame of a foldable, zero-pressure seat according to another embodiment of the present invention, which shows another arrangement of the push rod motor.

[0066] Figure 40 yes Figure 35 An exploded view of the upper front linkage and its accessories of the adjustable seat cushion frame of the foldable, zero-pressure seat shown.

[0067] Figure 41 yes Figure 35 An exploded view of the lower front linkage and its accessories of the adjustable seat cushion frame of the foldable, zero-pressure seat shown.

[0068] Figure 42 yes Figure 35 An exploded view of the seat cushion frame assembly of the adjustable seat cushion skeleton of the foldable, zero-pressure seat shown.

[0069] Figure 43 This is an exploded view of the adjustable seat cushion frame of a foldable, zero-pressure seat according to another embodiment of the present invention.

[0070] Figure 44 yes Figure 43 The diagram shows the rack and pinion drive assembly and push rod motor of the adjustable seat cushion frame of the foldable, zero-pressure seat.

[0071] Figure 45 Is it like this? Figure 43 An exploded view of the gear and rack drive assembly of the adjustable seat cushion frame of the foldable, zero-pressure seat shown.

[0072] Figure 46 Is it like this? Figure 43 The adjustable seat frame of the foldable, zero-pressure seat shown is illustrated in a side view of the push rod motor.

[0073] Figure 47 This is a side view of the adjustable seat cushion frame of a foldable, zero-pressure seat according to another embodiment of the present invention, which shows another arrangement of the push rod motor.

[0074] Figure 48 yes Figure 43 An exploded view of the upper front linkage and its accessories of the adjustable seat cushion frame of the foldable, zero-pressure seat shown.

[0075] Figure 49 yes Figure 43 An exploded view of the lower front linkage and its accessories of the adjustable seat cushion frame of the foldable, zero-pressure seat shown.

[0076] Figure 50 yes Figure 43An exploded view of the seat cushion frame assembly of the adjustable seat cushion skeleton of the foldable, zero-pressure seat shown.

[0077] Figure 51 This is an exploded view of the adjustable seat cushion frame of a foldable, zero-pressure seat according to another embodiment of the present invention.

[0078] Figure 52 yes Figure 51 The diagram shows the rack and pinion drive assembly and push rod motor of the adjustable seat cushion frame of the foldable, zero-pressure seat.

[0079] Figure 53 Is it like this? Figure 51 The diagram shows the installation method of the adjuster of the adjustable seat cushion frame of the foldable, zero-pressure seat on the right part of the seat cushion mounting bracket.

[0080] Figure 54 Is it like this? Figure 51 The diagram shows the installation method of the adjuster of the adjustable seat cushion frame of the foldable, zero-pressure seat on the left part of the seat cushion mounting bracket.

[0081] Figure 55 Is it like this? Figure 51 The adjustable seat frame of the foldable, zero-pressure seat shown is illustrated in a side view of the push rod motor.

[0082] Figure 56 This is a side view of the adjustable seat cushion frame of a foldable, zero-pressure seat according to another embodiment of the present invention, which shows another arrangement of the push rod motor.

[0083] Figure 57 yes Figure 51 An exploded view of the upper front linkage and its accessories of the adjustable seat cushion frame of the foldable, zero-pressure seat shown.

[0084] Figure 58 yes Figure 51 An exploded view of the lower front linkage and its accessories of the adjustable seat cushion frame of the foldable, zero-pressure seat shown.

[0085] Figure 59 yes Figure 51 An exploded view of the seat cushion frame assembly of the adjustable seat cushion skeleton of the foldable, zero-pressure seat shown. Detailed Implementation

[0086] like Figures 1-6The utility model discloses a foldable zero-pressure seat, which comprises a seat cushion framework 10 and an adjustable backrest framework 20 arranged separately from the seat cushion framework 10. The seat cushion framework 10 and the adjustable backrest framework 20 are installed separately on a sliding frame of a slide rail assembly 30, so that the seat cushion framework 10 and the adjustable backrest framework 20 are arranged separately and move forward and backward synchronously.

[0087] The seat cushion framework 10 comprises a seat cushion frame assembly 11 and a seat cushion mounting bracket 12. The front end of the seat cushion frame assembly 11 is hingedly connected with an upper front connecting rod 13, a lower front connecting rod 14 and the seat cushion mounting bracket 12 in sequence to form a hinged joint, that is, the front end of the seat cushion frame assembly 11 is hingedly connected with one end of the upper front connecting rod 13, the other end of the upper front connecting rod 13 is hingedly connected with one end of the lower front connecting rod 14, and the other end of the lower front connecting rod 14 is hingedly connected with the seat cushion mounting bracket 12. The rear end of the seat cushion frame assembly 11 is hingedly connected with one end of a rear connecting rod 15, and the other end of the rear connecting rod 15 is hingedly connected with the seat cushion mounting bracket 12 to form a hinged joint. Thus, the whole seat cushion framework 10 forms a five-link adjustable frame.

[0088] The seat cushion mounting bracket 12 is fixed, and in the embodiment, the seat cushion mounting bracket 12 is fixed on the sliding frame of the slide rail assembly 30 to realize the forward and backward movement of the whole seat cushion framework 10.

[0089] The seat cushion framework 10 further comprises two angle driving devices, which can be arranged at any two hinged joints of the seat cushion framework 10. Thus, the seat cushion height and the forward and backward position are adjusted by the two angle driving devices to drive the whole seat cushion framework 10 to the required position state. In the embodiment, the two angle driving devices are arranged at the hinged joint between the rear connecting rod 15 and the seat cushion mounting bracket 12 and the hinged joint between the lower front connecting rod 14 and the seat cushion mounting bracket 12 of the seat cushion framework 10.

[0090] In addition, the adjustable backrest framework 20 is hingedly connected with the sliding frame of the slide rail assembly 30, and the angle of the adjustable backrest framework 20 is driven by a backrest angle driving device arranged at the hinged joint between the adjustable backrest framework 20 and the slide rail assembly 30, so that the backrest and the seat cushion are independently driven.

[0091] In the utility model, the seat cushion framework 10 and the adjustable backrest framework 20 enable the seat to be switched between at least the following three states:

[0092] 1) normal posture: in some embodiments, the normal posture of the seat is as shown in Figure 1 and Figure 2As shown. In the normal posture, the rear link 15 of the seat cushion frame 10 is at a rearward tilted first angle, and the lower front link 14 is at a forward tilted first angle. The rear link 15 being at the rearward tilted first angle causes the rear end of the seat cushion frame assembly 11 to be at a first height and directly below the hinge node between the adjustable backrest frame 20 and the slide rail assembly 30. Simultaneously, the adjustable backrest frame 20 is at a rearward tilted first angle. Therefore, the entire seat is in the normal posture.

[0093] 2) Zero-pressure posture: In some embodiments, the zero-pressure posture of the seat is as follows: Figure 3 and Figure 4 As shown. During the process of adjusting the seat from a normal posture to a zero-pressure posture, the adjustable backrest frame 20 adjusts from the first backrest angle to the second backrest angle; the rear link 15 rotates from the first rear link angle to the second rear link angle, causing the rear end of the seat cushion frame 10 to move forward and upward, thereby aligning with the lower part of the backrest to solve the problem of lumbar support; the lower front link 14 rotates backward to the second front link angle, causing the front end of the seat cushion frame 10 to adjust upward. This achieves the zero-pressure posture of the seat.

[0094] In other words, in the zero-pressure position of the seat, the rear link 15 is at the second rear link angle, and the lower front link 14 is at the second front link angle, so that the rear and front ends of the seat cushion frame 10 are higher than the rear and front ends of the seat cushion frame 10 in the normal position, respectively. The adjustable backrest frame 20 is at the second backrest angle, which is tilted backward at an angle greater than the first backrest angle, and is flush with the rear end of the seat cushion frame 10.

[0095] 3) Folding posture: In some embodiments, the folding posture of the seat is as follows: Figure 5 and Figure 6 As shown. During the process of adjusting the seat from the normal posture to the folded posture, the adjustable backrest frame 20 is adjusted forward from the first backrest angle to the third backrest angle; the rear link 15 rotates forward from the first rear link angle to the third rear link angle, causing the rear end of the seat cushion frame 10 to move forward and downward; the lower front link 14 rotates forward to the third front link angle, causing the front end of the seat cushion frame 10 to move forward and downward, resulting in a lower folded position. Thus, the folded posture of the seat is achieved.

[0096] Furthermore, the seat's folding posture can be directly adjusted from the zero-pressure position to the folding posture. Correspondingly, the adjustable backrest frame 20 is adjusted from the second backrest angle forward to the third backrest angle with a forward tilt; the rear link 15 rotates directly from the second rear link angle forward to the third rear link angle, causing the rear end of the seat cushion frame 10 to move forward and downward; the lower front link 14 rotates directly forward to the third front link angle, causing the front end of the seat cushion frame 10 to move forward and downward, resulting in a lower folding position. Thus, the seat's folding posture is achieved.

[0097] That is, in the process of switching the seat from the normal posture and the zero-pressure posture to the folding posture, the driving device drives the lower front link 14 to rotate relative to the seat cushion mounting bracket 12, at the same time, the driving device drives the rear link to tilt forward, and through the seat cushion frame assembly 11, the driving device drives the upper front link 13 to rotate relative to the lower front link 14.

[0098] Preferably, in the folding posture of the seat, the rear link 15 and the lower front link 14 are respectively at the third rear link angle and the third front link angle which are forward-tilted and close to horizontal. The adjustable backrest skeleton 20 is at the third backrest angle which is forward-tilted and close to horizontal. In some embodiments, the third backrest angle and the third rear link angle are both less than 35 degrees with the horizontal plane.

[0099] In some embodiments, the back of the seat is provided with a luggage cover plate; when the seat is in the folding posture, the height of the backrest rear end of the seat is flush with the height of the luggage cover plate of the car, so that the luggage can form a bed surface together with the surrounding seats in the folding posture.

[0100] Compared with the existing seat cushion rear end height adjustment mechanism, the foldable and zero-pressure seat of the utility model improves the driving mode of the angle driving device (specifically adopts the combination of the angle adjuster motor and other motors) on the basis of the five-link structure, so that the rotation range of the seat cushion skeleton is more flexible, so that the three functions of zero-gravity position adjustment, seat cushion forward folding and seat cushion rear end height adjustment can be realized, while preventing the backrest top waist problem in the zero-gravity position, and further realizing the zero-gravity posture, the folding posture, the normal posture and other postures in cooperation with the backrest.

[0101] In other embodiments, as shown in Figures 7-9 The rear link 15 is at the first rear link angle which is rearward-tilted in the normal state, at the second rear link angle in the zero-pressure posture, and at the third rear link angle which is forward-tilted in the folding posture; but the angles of the lower front link 14 in different states are different, and the functions of the foldable and zero-pressure seat of the utility model can also be realized. Among them, the lower front link 14 is at the first front link angle which is rearward-tilted in the normal state, at the second front link angle in the zero-pressure posture, and at the third front link angle which is rearward-tilted in the folding posture, so as to realize the functions of the foldable and zero-pressure seat of the utility model.

[0102] As shown in Figures 10-13As shown, the lower fixing point 41 and the buckle mounting point 42 of the safety belt are both located on the two sides of the seat cushion mounting bracket 12, specifically at the rear position of the seat cushion mounting bracket 12; and the upper fixing point of the safety belt is the same as the prior art, located at the shoulder of the adjustable backrest framework 20. Thus, the safety belt can follow the body posture change in the conventional posture and the zero-pressure posture. The foldable zero-pressure seat of the utility model has the seat cushion framework 10 and the adjustable backrest framework 20 arranged independently from each other, and has stronger flexibility in adjustment, and can obtain a more optimal restraint effect in the zero-pressure state to ensure more stable safety performance.

[0103] The buckle mounting point 42 and the lower fixing point 41 of the safety belt are structured as shown in Figure 14 and Figure 15 .

[0104] First embodiment: foldable zero-pressure seat with front and rear connecting rods driven by angle adjuster and motor

[0105] As shown in Figures 16-20 , the foldable zero-pressure seat according to the first embodiment of the utility model has angle driving devices that both adopt a synchronous rod driven to rotate by an angle adjuster motor and an angle adjuster driven to rotate by the synchronous rod to drive the connecting rod to rotate. According to the first embodiment of the utility model, the basic structure of the seat cushion framework and the adjustable backrest framework is completely the same as the basic structure of the seat cushion framework 10 and the adjustable backrest framework 20 in the above.

[0106] As shown in Figure 16 , according to the first embodiment of the utility model, the seat cushion framework 110 includes a seat cushion frame assembly 111 and seat cushion mounting brackets 1121, 1122. The front end of the seat cushion frame assembly 111 is hingedly connected with the upper front connecting rod 113, the lower front connecting rod 114, and the seat cushion mounting bracket in sequence, that is, the front end of the seat cushion frame assembly 111 is hingedly connected with one end of the upper front connecting rod 113, the other end of the upper front connecting rod 113 is hingedly connected with one end of the lower front connecting rod 114, and the other end of the lower front connecting rod 114 is hingedly connected with the seat cushion mounting bracket. The rear end of the seat cushion frame assembly 111 is hingedly connected with one end of the rear connecting rod 115, and the other end of the rear connecting rod 115 is hingedly connected with the seat cushion mounting brackets 1121, 1122.

[0107] Since the seat cushion mounting brackets 1121, 1122 include a right piece 1121 and a left piece 1122 of the seat cushion mounting bracket, the number of the upper front connecting rod 113, the lower front connecting rod 114, and the rear connecting rod 115 can be 2.

[0108] The upper front connecting rod 113 and the lower front connecting rod 114, and the upper front connecting rod 113 and the seat cushion frame assembly 111 are hingedly connected by a connecting rod assembly bolt 1131.

[0109] As shown in Figure 17 andFigure 18 As shown, the angle driving device comprises an angle adjuster 116 arranged at the hinged joint between the seat cushion mounting bracket 1121, 1122 and the lower front connecting rod 114, and arranged at the hinged joint between the seat cushion mounting bracket 1121, 1122 and the rear connecting rod 115, the angle adjuster 116 being used to directly adjust the angle of the lower front connecting rod 114 and the rear connecting rod 115. The shaft center of the angle adjuster 116 is connected to the seat cushion mounting bracket, and the outer part (i.e. the tooth plate part) of the angle adjuster is connected to the lower front connecting rod 114 and the rear connecting rod 115 to rotate synchronously with the lower front connecting rod 114 and the rear connecting rod 115. At least one of the lower front connecting rod 114 and the rear connecting rod 115 is provided with an angle adjuster stop point 1161, and the seat cushion mounting bracket is provided with an angle adjuster stop part 1162 matched with the angle adjuster stop point 1161, so as to limit the adjustable angle range.

[0110] In other embodiments, the angle driving device can be arranged at other two hinged joints, and correspondingly, the angle driving device comprises an angle adjuster 116 arranged at the other two hinged joints, the angle adjuster 116 being used to directly or indirectly adjust the angle of the lower front connecting rod 114 and the rear connecting rod 115.

[0111] Please also refer to Figures 16-18 The angle driving device further comprises two synchronous rods inserted into the shaft center of the angle adjuster 116, which are a front synchronous rod 117 corresponding to the lower front connecting rod 114 and a rear synchronous rod 118 corresponding to the rear connecting rod 115.

[0112] The two ends of the front synchronous rod 117 and the rear synchronous rod 118 are provided with synchronous rod clamping springs 1171, which are used to fix the two ends of the front synchronous rod 117 and the rear synchronous rod 118 to the shaft center of the angle adjuster 116.

[0113] The lower front connecting rod 114 is fixedly provided with an angle adjuster motor 119, the driving shaft of the angle adjuster motor 119 being used to drive the front synchronous rod 117 to rotate, thereby driving the shaft center of the angle adjuster 116 to rotate, so that the seat cushion mounting bracket 1121, 1122 and the lower front connecting rod 114 rotate relatively. Similarly, the rear connecting rod 115 is fixedly provided with an angle adjuster motor 119, the driving shaft of the angle adjuster motor 119 being used to drive the rear synchronous rod 118 to rotate, thereby driving the shaft center of the angle adjuster 116 to rotate, so that the seat cushion mounting bracket 1121, 1122 and the rear synchronous rod 118 rotate relatively.

[0114] The driving shaft of the angle adjuster motor 119 can drive the synchronous rod to rotate in the form that the driving shaft and the synchronous rod are provided with teeth that mesh with each other, and the driving shaft of the angle adjuster motor 119 drives the synchronous rod to rotate through the meshing between the driving shaft and the synchronous rod.

[0115] Thus, the angle driving device comprises synchronous rods 117, 118 driven to rotate by the recliner motor 119, and a recliner 116 driven to rotate by the synchronous rods 117, 118 to drive the connecting rod to rotate, the rotation of the front lower connecting rod and the rear connecting rod is realized by driving the synchronous rods by the recliner motor to drive the recliner, the rotation range of the seat cushion framework is more flexible, and thus the three functions of zero-gravity position adjustment, seat cushion forward folding, and seat cushion rear end height adjustment can be realized, while the backrest top waist problem at the zero-gravity position is prevented.

[0116] The recliner motor 119 is installed on the front lower connecting rod 114 or the rear connecting rod 115 through a motor mounting bolt 1191 and a motor mounting bracket 1192.

[0117] Figure 19 And Figure 20 The specific structure of the seat cushion framework assembly 111 is shown. Figure 19 And Figure 20 As shown in the drawings, the seat cushion framework assembly 111 comprises left and right seat frame side plates 1111, a cross pipe 1112 connected between the rear ends of the two seat frame side plates 1111, a submarine pipe 1113 connected between the front ends of the two seat frame side plates 1111, a submarine pipe bracket 1114 sleeved on the submarine pipe 1113, and a seat cushion half basin 1116 arranged on the submarine pipe bracket 1114.

[0118] The top end of the rear connecting rod 115 is matched with the cross pipe 1112 to realize the hinged connection of the rear connecting rod with the rear end of the seat cushion framework assembly.

[0119] A bushing 1115 is arranged between the cross pipe 1112 and the seat frame side plate 1111 and between the submarine pipe 1113 and the seat frame side plate 1111.

[0120] Second embodiment: foldable zero-pressure seat with rear connecting rod directly driven by a direct connection motor and front lower connecting rod driven by a recliner and a motor

[0121] As Figures 21-26 The foldable zero-pressure seat according to the second embodiment of the present application is shown, wherein the angle driving device for driving the rear connecting rod comprises a stepped bolt fixedly connected with the rear connecting rod and a direct connection motor connected with the stepped bolt to drive the stepped bolt to rotate, and the angle driving device for driving the front lower connecting rod comprises a synchronous rod driven to rotate by a recliner motor and a recliner driven to rotate by the synchronous rod to drive the front lower connecting rod to rotate.

[0122] As Figure 21As shown, according to the second embodiment of the utility model, the seat cushion framework 210 comprises a seat cushion frame assembly 211 and seat cushion mounting supports 2121, 2122. The front end of the seat cushion frame assembly 211 is hingedly connected with the upper front connecting rod 213, the lower front connecting rod 214 and the seat cushion mounting supports in sequence, that is, the front end of the seat cushion frame assembly 211 is hingedly connected with one end of the upper front connecting rod 213, the other end of the upper front connecting rod 213 is hingedly connected with one end of the lower front connecting rod 214, and the other end of the lower front connecting rod 214 is hingedly connected with the seat cushion mounting supports. The rear end of the seat cushion frame assembly 211 is hingedly connected with one end of the rear connecting rod 215, and the other end of the rear connecting rod 215 is hingedly connected with the seat cushion mounting supports.

[0123] Since the seat cushion mounting supports 2121, 2122 comprise a right piece 2121 and a left piece 2122 of the seat cushion mounting supports, the number of the upper front connecting rod 213, the lower front connecting rod 214 and the rear connecting rod 215 can be two. The upper front connecting rod 213 and the lower front connecting rod 214 and the upper front connecting rod 213 and the seat cushion frame assembly 211 are hingedly connected through connecting rod assembly bolts 2131.

[0124] As shown in the figure, Figures 21-23 The angle driving device comprises an angle adjuster 216 arranged at the hinged joint between the seat cushion mounting supports 2121, 2122 and the lower front connecting rod 214, and the angle adjuster 216 is used for adjusting the angle of the lower front connecting rod 214. The shaft center of the angle adjuster 216 is connected with the seat cushion mounting supports, and the outer part (i.e. the tooth plate part) of the angle adjuster is connected with the lower front connecting rod 214 to rotate synchronously with the lower front connecting rod 214. At least one of the lower front connecting rod 214 is provided with an angle adjuster stop point 2161, and the seat cushion mounting supports are provided with an angle adjuster stop part 2162 matched with the angle adjuster stop point 2161 to limit the adjustable angle range of the angle of the rear connecting rod 215.

[0125] In other embodiments, when the angle adjuster is in other hinged positions, the angle adjuster stop point 2161 and the angle adjuster stop part 2162 matched with each other can be arranged at other hinged joints with the angle adjuster.

[0126] The foldable zero-pressure seat further comprises a front synchronous rod 217 inserted into the shaft center of the angle adjuster 216.

[0127] The two ends of the front synchronous rod 217 are provided with synchronous rod clamping springs 2171, and the synchronous rod clamping springs 2171 are used for fixing the two ends of the front synchronous rod 217 to the shaft center of the angle adjuster 216.

[0128] The lower front connecting rod 214 is fixedly provided with an angle adjuster motor 219, and the driving shaft of the angle adjuster motor 219 is used for driving the front synchronous rod 217 to rotate, thereby driving the shaft center of the angle adjuster 216 to rotate, so that the relative rotation between the seat cushion mounting supports 2121, 2122 and the lower front connecting rod 214 occurs.

[0129] The driving shaft of the recliner motor 219 can drive the synchronous rod 217 to rotate in the following manner: a plurality of teeth are arranged on the outer side of the driving shaft and the synchronous rod 217, and the driving shaft of the recliner motor 219 drives the synchronous rod to rotate through the engagement between the driving shaft and the synchronous rod.

[0130] Thus, the angle driving device comprises the synchronous rod 217 driven to rotate by the recliner motor 219 and the recliner 216 driven to rotate by the synchronous rod 217, and the recliner motor drives the synchronous rod and further drives the recliner to rotate in the following manner: the angle rotation of the front lower link and the rear link is realized, the rotation range of the seat cushion framework is more flexible, and thus the three functions of zero-gravity position adjustment, seat cushion folding forward, and seat cushion rear end height adjustment can be realized, and the problem of the backrest top waist at the zero-gravity position is prevented.

[0131] The recliner motor 219 is installed on the front lower link 214 through the motor mounting bolt 2191 and the motor mounting bracket 2192. In this embodiment, the recliner motor 219 is an RTA driving motor.

[0132] Please also refer to Figure 21 In this embodiment, the first nut 2152 and the first bolt 2153 are arranged at the hinged joint between the right part 2122 of the seat cushion mounting bracket and the rear link 215, and the first nut 2152 and the first bolt 2153 are used to hinge the right part 2121 of the seat cushion mounting bracket and the rear link 215 together. Specifically, the first bolt 2153 is sleeved with a bushing and is hingedly fixed to the seat cushion mounting bracket together with the first nut 2152.

[0133] As shown in Figure 21 and Figure 24As shown, a second gasket 2154, a second nut 2155 and a second bolt 2156 are arranged at the hinged joint between the left piece 2122 of the seat cushion mounting bracket and the rear connecting rod 215, the second gasket 2154 is used to separate the seat cushion mounting bracket from the rear connecting rod 215, the second nut 2155 and the second bolt 2156 are used to hinge the left piece 2122 of the seat cushion mounting bracket and the rear connecting rod 215 together, the second bolt 2156 is sleeved with a bushing 201 and is hinged to the seat cushion mounting bracket together with the second nut 2155. The second bolt 2156 is a stepped bolt, which has a square shaft section 2157, a first circular shaft section 2158 and a second circular shaft section 2159. The second circular shaft section 2159 is welded and fixed with the rear connecting rod 215, so that they rotate synchronously; the first circular shaft section 2158 is inserted into the mounting hole of the seat cushion mounting bracket, so that the second bolt 2156 can rotate relative to the seat cushion mounting bracket; the square shaft section 2157 is connected with a driving part of a direct-connected motor 218 to drive the second bolt 2156 to rotate, thereby driving the rear connecting rod 215 to rotate, wherein the driving part is provided with a mounting hole matched with the square shaft section of the second bolt 2156. The direct-connected motor 218 is fixed on the seat cushion mounting bracket through a motor mounting bolt 2181. In the embodiment, the direct-connected motor 218 is a PHA motor (electric height adjustment mechanism), which is currently applied to a skeleton system with or without a power spring, has excellent strength and self-locking performance, and can realize seamless switching between manual and electric.

[0134] In addition, the connecting rod assembly bolts 2131 are all provided with bushings 201, and the cooperation structure of the rear connecting rod 215 and the seat cushion frame assembly 211 is provided with a bushing 201, so that the assembly of the entire seat cushion skeleton 210 is more stable.

[0135] Figure 25 And Figure 26 The specific structure of the seat cushion frame assembly 211 is shown. As shown in Figure 25 And Figure 26 As shown, the specific structure of the seat cushion frame assembly 211 according to the second embodiment of the utility model is exactly the same as that of the seat cushion frame assembly of the first embodiment of the utility model, which comprises seat frame side plates 2111 on the left and right sides, a cross pipe 2112 connected between the rear ends of the two seat frame side plates 2111, a anti-submarine pipe 2113 connected between the front ends of the two seat frame side plates 2111, an anti-submarine pipe bracket 2114 sleeved on the anti-submarine pipe 2113, and a seat cushion half-pot 2116 arranged on the anti-submarine pipe bracket 2114.

[0136] The top end of the rear link 215 matches the cross tube 2112 to achieve a hinge connection between the rear link and the rear end of the seat frame assembly. The difference from the first embodiment of this invention is that, due to the presence of the direct-drive motor 218, the rear link 215, driven by the direct-drive motor 218, is no longer located at either end of the cross tube 2112 as in the first embodiment of this invention, but is closer to the middle portion of the cross tube 2112.

[0137] Therefore, the angle drive device for driving the rear link includes a stepped bolt fixedly connected to the rear link and a direct-drive motor connected to the stepped bolt to drive its rotation. The angle drive device for driving the lower front link includes a synchronizing rod driven by an adjuster motor and an adjuster driven by the synchronizing rod. By directly driving the rear link with a direct-drive motor, driving the synchronizing rod with an adjuster motor to drive the adjuster and thus the link, and directly driving the link with a motor, the angle rotation of the rear link and the lower front link is achieved respectively. This makes the rotation range of the seat cushion frame more flexible, enabling the three functions of zero-gravity position adjustment, forward folding of the seat cushion, and rear seat height adjustment to be realized, while preventing backrest lumbar support issues at the zero-gravity position.

[0138] In other embodiments, such as Figure 27 As shown, the angle drive devices corresponding to the rear link and the lower front link can be interchanged, such that the angle drive device for driving the lower front link includes a stepped bolt fixedly connected to the rear link and a direct-drive motor connected to the stepped bolt to drive the stepped bolt to rotate, and the angle drive device for driving the rear link includes a synchronizing rod driven to rotate by an angle adjuster motor and an angle adjuster driven to rotate by the synchronizing rod.

[0139] In other embodiments, the stepped bolt can be fixedly connected to the mechanism on either side of the hinged node to rotate synchronously with it. For example, the stepped bolt can also be connected to the seat mounting frame to be fixed with it, and the linkage rotates by the rotation of the motor itself. Furthermore, the hinged node with the stepped bolt and the direct-drive motor can be any hinged node. The angle driving device includes an angle adjuster located at one hinged node, and a stepped bolt and a direct-drive motor driving the stepped bolt to rotate located at another hinged node. The stepped bolt and the direct-drive motor are respectively fixed to two different mechanisms hinged at the hinged node.

[0140] Third embodiment: A foldable, zero-pressure seat with the rear linkage driven by a gear motor and rack, and the lower front linkage driven by an adjuster and motor.

[0141] According to the third embodiment of the utility model, the structure of the adjustable backrest framework is completely same with the structure of the adjustable backrest framework described above, the structure of the seat cushion framework is basically same with the structure of the seat cushion framework 110 of the first embodiment of the utility model, the only difference is that the driving mode of the rear connecting rod is changed from driving through the angle adjuster and the motor to driving through the gear motor and the rack.

[0142] As Figures 28-30 shown, according to the third embodiment of the utility model, the rear end of the seat cushion framework assembly 311 is hinged with one end of the rear connecting rod 315, and the other end of the rear connecting rod 315 is hinged with the seat cushion mounting bracket 312 at the hinged node A.

[0143] The angle driving device for driving the rear connecting rod 315 includes the rack 319 and the gear motor 318 fixedly installed on the rear connecting rod 315, one end of the rack 319 is hinged on the rack hinged node B on the seat frame mounting bracket 312, and the teeth thereon are engaged with the gear on the output shaft 3181 of the gear motor 318.

[0144] Therefore, the output shaft 3181 of the gear motor 318 is located on the rear connecting rod 315, and can rotate synchronously with the rear connecting rod 315 around the hinged node A, so the relative distance between the output shaft 3181 and the hinged node A is fixed. The hinged node A and the rack hinged node B are both located on the seat frame mounting bracket 312, and the relative position and distance therebetween are fixed. By driving the rack 319 through the gear motor 318, the relative distance between the output shaft 3181 and the rack hinged node B can be changed, and then the output shaft 3181 and the rear connecting rod 315 are synchronously rotated to realize the normal posture, the zero-pressure posture and the folding posture of the foldable zero-pressure seat described above.

[0145] In this embodiment, the rack hinged node B between the rack 319 and the seat frame mounting bracket 312 is located in front of the hinged node A between the rear connecting rod 315 and the seat frame mounting bracket 312, and the gear motor 318 is installed on the rear side of the rear connecting rod 315, so that the rotatable range of the rear connecting rod 315 meets the requirements, and the interference between the gear motor 318 and the seat frame mounting bracket 312 is avoided when the foldable zero-pressure seat is in the normal posture and the folding posture.

[0146] The rack 319 is hinged with a part of the seat frame mounting support 312 at a rack hinged node B, and the seat frame mounting support 312 is further hinged with a motor gear mounting support 320, the motor gear mounting support 320 is provided with a rack pressing block 321, the motor gear mounting support 320 is inserted with the gear of the output shaft 3181 and the rack 319, and the rack pressing block 321 is used to press the gear of the output shaft 3181 and the rack 319 together to realize the meshing of the two. Thus, the angle driving device for driving the rear connecting rod 315 is realized by directly driving the hinged node A (i.e. the rear connecting rod 315 and the seat frame mounting support 312 hinged by the driving hinged node A), so as to rotate the rear connecting rod 315 around the hinged node A, and then directly or indirectly adjust the angle of the rear connecting rod 315.

[0147] In other embodiments, as shown in Figure 31 the installation position of the rack and pinion motor can be interchanged, that is, the rear connecting rod is provided with a rack hinged node which is hinged with one end of the rack and is spaced apart from the hinged node A, and the rack and pinion motor is fixedly installed on the seat cushion mounting support 312 and is meshed with the gear on the output shaft of the rack and pinion motor and the teeth on the rack. Thus, the angle driving device for driving the rear connecting rod 315 is realized by directly driving the hinged node A, so as to rotate the rear connecting rod 315 around the hinged node A, and then directly or indirectly adjust the angle of the rear connecting rod 315.

[0148] In the embodiment, the angle driving device for directly or indirectly adjusting the angle of the rear connecting rod 315 is realized by directly driving the rear connecting rod 315 to rotate around the hinged node A, that is, by directly driving the mechanism on both sides of the hinged node A. However, in other embodiments, the angle driving device for adjusting the angle of the rear connecting rod 315 is not limited to being realized by driving the hinged node A.

[0149] For example, in another embodiment, as shown in Figure 32 the other structural arrangements are the same as those of the third embodiment of the utility model, and the difference is that the angle driving device can realize the angle adjustment of the rear connecting rod 315 by driving the hinged node C, which is the hinged node between the rear connecting rod 315 and the seat cushion frame assembly 311. Specifically, the rear connecting rod 315 is provided with a rack hinged node which is hinged with one end of the rack and is spaced apart from the hinged node C, and the rack and pinion motor is fixedly installed on the seat cushion frame assembly 311 and is meshed with the gear on the output shaft of the rack and pinion motor and the teeth on the rack.

[0150] Furthermore, in other embodiments in which the angle driving device for adjusting the angle of the rear link 315 is implemented by driving the hinged joint C, the fixed mounting positions of the rack hinged joint and the gear motor can be interchanged, as long as the rack hinged joint is provided on one of the rear link 315 and the seat cushion frame assembly 311, and the mounting position of the gear motor is located on the other one of the rear link 315 and the seat cushion frame assembly 311.

[0151] The second hinged joint is used for driving the angle driving device of the first hinged joint to adjust the angle of the lower front link directly or indirectly, and the angle driving device for driving the second hinged joint.

[0152] Fourth embodiment: foldable zero-pressure seat with the lower front link driven by a gear motor and a rack and the rear link driven by an angle adjuster and a motor

[0153] According to the fourth embodiment of the present application, the structure of the adjustable backrest framework is completely the same as that described above, the structure of the seat cushion framework is basically the same as that of the seat cushion framework 110 of the first embodiment of the present application, and the only difference is that the driving mode of the lower front link is changed from being driven by an angle adjuster and a motor to being driven by a motor and a rack.

[0154] As shown in Figs. Figure 33 and Figure 34 According to the fourth embodiment of the present application, the rear end of the seat cushion frame assembly 411 is hinged to one end of the lower front link 414, and the other end of the lower front link 414 is hinged to the seat cushion mounting bracket 412 at the hinged joint A.

[0155] The angle driving device for driving the lower front link 414 includes a rack 419 and a gear motor 418 fixedly mounted on the rear link 315, one end of the rack 419 is hinged to a rack hinged joint B' on the lower front link 414, and the teeth thereon are engaged with the gear on the output shaft 4181 of the gear motor 418. In this embodiment, the gear motor 418 is a PHA motor.

[0156] Therefore, the rack hinged joints B' of the rack 419 are all located on the lower front link 414, and the rack hinged joints B' and the lower front link 414 can rotate synchronously around the hinged joint A', so the relative distance between the rack hinged joints B' and the hinged joint A' is fixed. The hinged joint A' and the output shaft 4181 of the gear motor 418 are both located on the seat frame mounting bracket 412, and the relative position and distance therebetween are fixed. By driving the rack 419 through the gear motor 418, the relative distance between the output shaft 4181 and the rack hinged joint B' can be changed, and then the rack hinged joint B' and the lower front link 414 are driven to rotate synchronously, so as to realize the normal posture, the zero-pressure posture and the folding posture of the foldable zero-pressure seat described above.

[0157] In the present embodiment, the lower front link 414 is deformed to extend downward relative to the articulated node A', and the rack articulation node B' between the rack 419 and the seat frame mounting bracket 412 is located in front of the articulated node A' between the lower front link 414 and the seat frame mounting bracket 412, so that the rotatable range of the lower front link 414 meets the requirements, avoiding the interference between the gear motor 418 and the seat frame mounting bracket 412 when the foldable zero-pressure seat is in the regular posture and the folded posture.

[0158] The seat frame mounting bracket 412 is further provided with a fixed motor gear mounting bracket 420, the motor gear mounting bracket 420 is provided with a rack pressing block, the motor gear mounting bracket 420 is provided for the gear of the output shaft 4181 and the rack 419 to be inserted, and the rack pressing block is used to press the gear of the output shaft 4181 and the rack 419 together to realize the meshing of the two.

[0159] Fifth embodiment: foldable zero-pressure seat with rear link driven by gear motor and rack and lower front link driven by lead screw motor

[0160] According to the fifth embodiment of the present application, the structure of the adjustable backrest framework is exactly the same as the structure of the adjustable backrest framework described above, the structure of the seat cushion framework is basically the same as the structure of the seat cushion framework 110 of the first embodiment of the present application, and the only difference is that the driving mode of the rear link is changed to be driven by a gear motor and a rack, and the driving mode of the front link is changed to be driven by a lead screw motor.

[0161] As shown in Figure 35 According to the fifth embodiment of the present application, the seat cushion framework 510 includes a seat cushion frame assembly 511 and seat cushion mounting brackets 5121, 5122. The front end of the seat cushion frame assembly 511 is articulated with the upper front link 513, the lower front link 514, and the seat cushion mounting bracket in turn, that is, the front end of the seat cushion frame assembly 511 is articulated with one end of the upper front link 513, the other end of the upper front link 513 is articulated with one end of the lower front link 514, and the other end of the lower front link 514 is articulated with the seat cushion mounting bracket at a first articulated node. The rear end of the seat cushion frame assembly 511 is articulated with one end of the rear link 515, and the other end of the rear link 515 is articulated with the seat cushion mounting bracket at a second articulated node.

[0162] Since the seat cushion mounting brackets 5121, 5122 include a right piece 5121 and a left piece 5122 of the seat cushion mounting bracket, the number of the upper front link 513, the lower front link 514, and the rear link 515 can be 2. The articulation between the lower front link 514 and the seat cushion mounting bracket 5121, 5122 and the articulation between the rear link 515 and the seat cushion mounting bracket 5121, 5122 are both achieved by a link assembly bolt 5131.

[0163] That is, as shown in Figure 38 , the first articulation joint is the articulation joint between the seat cushion mounting bracket and the upper front link 513, and the second articulation joint is the articulation joint between the seat cushion mounting bracket and the rear link 515.

[0164] As shown in Figure 35 , the angular drive device for driving the second articulation joint and thus the rear link 515 to rotate is a rack and pinion drive assembly 516, which is connected to the seat cushion mounting bracket and the rear link 515 (i.e. the two opposite rotatable mechanisms articulated on both sides of the second articulation joint) through a motor mounting screw 5161 and a rack mounting screw 5162, respectively.

[0165] As shown in Figure 36 and Figure 38 , the rack and pinion drive assembly 516 includes a rack 5163 and a gear motor 5164 fixedly mounted on the right piece 5121 of the seat cushion mounting bracket, one end of the rack 5163 is articulated on a fixed rack articulation joint 5166 on the rear link 515, which is spaced apart from the second articulation joint, and the teeth on the rack 5163 are engaged with the pinion on the output shaft of the gear motor 5164. The gear motor 5164 is fixed on the right piece 5121 of the seat cushion mounting bracket through the motor mounting screw 5161 and the motor mounting bracket 5165.

[0166] In other embodiments, the installation positions of the rack articulation joint and the gear motor can be interchanged, as long as one of the seat cushion mounting bracket and the rear link is provided with a rack articulation joint articulated with one end of the rack and spaced apart from the second articulation joint, and the other is fixedly mounted with the gear motor and engaged with the teeth on the rack through the pinion on the output shaft of the gear motor.

[0167] Please also refer to Figure 35 , the angular drive device for driving the first articulation joint and thus the lower front link 514 to rotate is a push rod motor 517, wherein the rear end of the push rod motor 517 is a fixed end and is fixed on the left piece 5122 of the seat cushion mounting bracket through a push rod motor rear mounting screw 5171, and the front end of the push rod motor 517 is a movable end and is articulated with a push rod motor articulation joint on the lower front link 514 through a push rod motor front mounting screw 5172, which is spaced apart from the first articulation joint. Therefore, when the push rod motor 517 is working, it will drive the push rod motor articulation joint to rotate around the first articulation joint, thus driving the lower front link 514 to rotate relative to the seat cushion mounting bracket.

[0168] In this embodiment, the push rod motor 517 is a lead screw motor.

[0169] As shown in Figure 37 and Figure 38As shown in the fifth embodiment, the push rod motor hinge point 5141 on the lower front connecting rod 514 is kept below the first hinge joint 5142 between the seat cushion mounting bracket and the lower front connecting rod 514, so the push rod motor 517 is arranged horizontally, and the movable end of the push rod motor 517 moving forward will drive the lower front connecting rod 514 to rotate upward, i.e. the lower front connecting rod 514 rotates counterclockwise in the direction of arrow A, thereby driving the front end of the seat cushion frame assembly 511 to rise; and the movable end of the push rod motor 517 moving backward will drive the lower front connecting rod 514 to rotate downward, thereby driving the front end of the seat cushion frame assembly 511 to fall. Figure 37 As shown in the fifth embodiment, the push rod motor hinge point 5141 on the lower front connecting rod 514 is kept below the first hinge joint 5142 between the seat cushion mounting bracket and the lower front connecting rod 514, so the push rod motor 517 is arranged horizontally, and the movable end of the push rod motor 517 moving forward will drive the lower front connecting rod 514 to rotate upward, i.e. the lower front connecting rod 514 rotates counterclockwise in the direction of arrow A, thereby driving the front end of the seat cushion frame assembly 511 to rise; and the movable end of the push rod motor 517 moving backward will drive the lower front connecting rod 514 to rotate downward, thereby driving the front end of the seat cushion frame assembly 511 to fall.

[0170] As shown in the fifth embodiment, the push rod motor hinge point 5141 on the lower front connecting rod 514 is kept below the first hinge joint 5142 between the seat cushion mounting bracket and the lower front connecting rod 514, so the push rod motor 517 is arranged horizontally, and the movable end of the push rod motor 517 moving forward will drive the lower front connecting rod 514 to rotate upward, i.e. the lower front connecting rod 514 rotates counterclockwise in the direction of arrow A, thereby driving the front end of the seat cushion frame assembly 511 to rise; and the movable end of the push rod motor 517 moving backward will drive the lower front connecting rod 514 to rotate downward, thereby driving the front end of the seat cushion frame assembly 511 to fall. Figure 39 As shown in the fifth embodiment, the push rod motor hinge point 5141 on the lower front connecting rod 514 is kept below the first hinge joint 5142 between the seat cushion mounting bracket and the lower front connecting rod 514, so the push rod motor 517 is arranged horizontally, and the movable end of the push rod motor 517 moving forward will drive the lower front connecting rod 514 to rotate upward, i.e. the lower front connecting rod 514 rotates counterclockwise in the direction of arrow A, thereby driving the front end of the seat cushion frame assembly 511 to rise; and the movable end of the push rod motor 517 moving backward will drive the lower front connecting rod 514 to rotate downward, thereby driving the front end of the seat cushion frame assembly 511 to fall. Figure 39 As shown in the fifth embodiment, the push rod motor hinge point 5141 on the lower front connecting rod 514 is kept below the first hinge joint 5142 between the seat cushion mounting bracket and the lower front connecting rod 514, so the push rod motor 517 is arranged horizontally, and the movable end of the push rod motor 517 moving forward will drive the lower front connecting rod 514 to rotate upward, i.e. the lower front connecting rod 514 rotates counterclockwise in the direction of arrow A, thereby driving the front end of the seat cushion frame assembly 511 to rise; and the movable end of the push rod motor 517 moving backward will drive the lower front connecting rod 514 to rotate downward, thereby driving the front end of the seat cushion frame assembly 511 to fall.

[0171] As shown in the fifth embodiment, the push rod motor hinge point 5141 on the lower front connecting rod 514 is kept below the first hinge joint 5142 between the seat cushion mounting bracket and the lower front connecting rod 514, so the push rod motor 517 is arranged horizontally, and the movable end of the push rod motor 517 moving forward will drive the lower front connecting rod 514 to rotate upward, i.e. the lower front connecting rod 514 rotates counterclockwise in the direction of arrow A, thereby driving the front end of the seat cushion frame assembly 511 to rise; and the movable end of the push rod motor 517 moving backward will drive the lower front connecting rod 514 to rotate downward, thereby driving the front end of the seat cushion frame assembly 511 to fall. Figure 40 As shown in the fifth embodiment, the push rod motor hinge point 5141 on the lower front connecting rod 514 is kept below the first hinge joint 5142 between the seat cushion mounting bracket and the lower front connecting rod 514, so the push rod motor 517 is arranged horizontally, and the movable end of the push rod motor 517 moving forward will drive the lower front connecting rod 514 to rotate upward, i.e. the lower front connecting rod 514 rotates counterclockwise in the direction of arrow A, thereby driving the front end of the seat cushion frame assembly 511 to rise; and the movable end of the push rod motor 517 moving backward will drive the lower front connecting rod 514 to rotate downward, thereby driving the front end of the seat cushion frame assembly 511 to fall.

[0172] As shown in the fifth embodiment, the push rod motor hinge point 5141 on the lower front connecting rod 514 is kept below the first hinge joint 5142 between the seat cushion mounting bracket and the lower front connecting rod 514, so the push rod motor 517 is arranged horizontally, and the movable end of the push rod motor 517 moving forward will drive the lower front connecting rod 514 to rotate upward, i.e. the lower front connecting rod 514 rotates counterclockwise in the direction of arrow A, thereby driving the front end of the seat cushion frame assembly 511 to rise; and the movable end of the push rod motor 517 moving backward will drive the lower front connecting rod 514 to rotate downward, thereby driving the front end of the seat cushion frame assembly 511 to fall. Figure 41As shown, in the present embodiment, the number of lower front connecting rods 514 is two, which are right and left lower front connecting rods. The two lower front connecting rods 514 are each provided with a gasket 5143 at a first hinged joint between the lower front connecting rod and the seat cushion mounting bracket, and the two lower front connecting rods 514 are connected together through a lower front connecting rod cross pipe 5144 at a hinged joint between the lower front connecting rod and the upper front connecting rod 513, so as to further ensure the synchronous rotation of the two upper front connecting rods 513. A bushing 501 is arranged between the lower front connecting rod 514 and the lower front connecting rod cross pipe 5144, and at least one end of the upper front connecting rod cross pipe 5132 is provided with a cross pipe rubber sleeve 5145, so that the assembly is more stable. The right and left lower front connecting rods differ in that the left lower front connecting rod is further provided with a push rod motor hinged joint 5141 below the first hinged joint 5142, so that the left lower front connecting rod forms an inverted V-shaped structure with the push rod motor hinged joint 5141 as the top point, and the push rod motor hinged joint 5141 of the lower front connecting rod 514 and the lower front connecting rod cross pipe 5144 are further connected through a lower front connecting rod reinforcing bracket 5146 to further strengthen the strength of the left lower front connecting rod. In addition, the rod body of the cross rod 5144 of the lower front connecting rod is provided with a torsional spring fixing hole to be fixedly connected with one end of a torsional spring 5147, and the other end of the torsional spring 5147 is connected with the upper front connecting rod 513, so as to provide a force to the lower front connecting rod 514 through the torsional spring 5147 to rotate in a direction that increases the included angle between the lower front connecting rod 514 and the upper front connecting rod 513.

[0173] Figure 42 The specific structure of the seat cushion frame assembly 511 is shown. As shown in the figure, Figure 42 The seat cushion frame assembly 511 includes seat frame side plates 5111 on the left and right sides, a seat cushion cross pipe 5112 connected between the rear ends of the two seat frame side plates 5111, a anti-submarine pipe 5113 connected between the front ends of the two seat frame side plates 5111, an anti-submarine pipe bracket 5114 sleeved on the anti-submarine pipe 5113, and a seat cushion half basin 5116 arranged on the anti-submarine pipe bracket 5114.

[0174] In addition, the connecting rod assembly bolts 5131 are each provided with a bushing 501, and the seat cushion cross pipe 5112 and the seat frame side plate 5111 are provided with a bushing 501, so that the assembly of the entire seat cushion framework 510 is more stable. The top end of the rear connecting rod 515 matches the seat cushion cross pipe 5112 to realize the hinging of the rear connecting rod and the rear end of the seat cushion frame assembly.

[0175] Thus, the angle driving device realizes the angular rotation of the lower front connecting rod and the rear connecting rod, so that the rotation range of the seat cushion framework is more flexible, thereby realizing the three functions of zero gravity position adjustment, seat cushion forward folding, and seat cushion rear end height adjustment, while preventing the problem of the backrest top waist at the zero gravity position.

[0176] Sixth embodiment: foldable zero-pressure seat with rear link driven by gear motor and rack and lower front link driven by lead screw motor

[0177] According to the sixth embodiment of the present application, the structure of the adjustable backrest framework is completely the same as that described above, the structure of the seat cushion framework is basically the same as that of the seat cushion framework 110 of the first embodiment of the present application, and the only difference is that the driving mode of the rear link is changed to be driven by a gear motor and a rack, and the driving mode of the front link is changed to be driven by a lead screw motor.

[0178] As shown in Figure 43 According to the sixth embodiment of the present application, the seat cushion framework 610 includes a seat cushion frame assembly 611 and seat cushion mounting brackets 6121, 6122. The front end of the seat cushion frame assembly 611 is hingedly connected to the upper front link 613, the lower front link 614, and the seat cushion mounting brackets in turn, that is, the front end of the seat cushion frame assembly 611 is hingedly connected to one end of the upper front link 613, the other end of the upper front link 613 is hingedly connected to one end of the lower front link 614, and the other end of the lower front link 614 is hingedly connected to the seat cushion mounting brackets at a first hinged joint. The rear end of the seat cushion frame assembly 611 is hingedly connected to one end of the rear link 615 at a second hinged joint, and the other end of the rear link 615 is hingedly connected to the seat cushion mounting brackets.

[0179] Since the seat cushion mounting brackets 6121, 6122 include a right piece 6121 and a left piece 6122 of the seat cushion mounting bracket, the number of the upper front link 613, the lower front link 614, and the rear link 615 can be two. The hinged connection between the upper front link 613 and the lower front link 614, between the lower front link 614 and the seat cushion mounting brackets 6121, 6122, and between the rear link 615 and the seat cushion mounting brackets 6121, 6122 is achieved by a link assembly bolt 6131.

[0180] That is, as shown in Figure 44 In the sixth embodiment of the present application, the main difference from the fifth embodiment is that the first hinged joint is the hinged joint between the seat cushion mounting brackets and the lower front link 614, and the second hinged joint is the hinged joint between the seat cushion frame assembly 611 and the rear link 615.

[0181] As shown in Figure 43 and Figure 45 The angle driving device for driving the second hinged joint and thereby rotating the rear link 615 is a gear rack driving assembly 616, which is connected to the seat cushion frame assembly 611 and the rear link 615 (i.e., two opposite rotatable mechanisms hingedly connected on both sides of the second hinged joint) by a motor mounting bolt 6161 and a rack mounting bolt 6162, respectively.

[0182] The gear rack driving assembly 616 comprises a gear rack 6163 and a gear motor 6164 fixedly installed on the seat cushion frame assembly 611, one end of the gear rack 5163 is hingedly connected to a fixed gear rack hinge node 6166 on the rear connecting rod 615 through a gear rack mounting bolt 6162, the gear rack hinge node is spaced apart from the second hinge node, and the teeth on the gear rack 6163 are engaged with the gear on the output shaft of the gear motor 6164. The gear motor 6164 is fixed on the seat cushion frame assembly 611 through a motor mounting bolt 6161 and a motor mounting bracket 6165.

[0183] In other embodiments, the installation positions of the gear rack and the gear motor can be interchanged, that is, one of the seat cushion frame assembly 611 and the rear connecting rod 615 is provided with a gear rack hinge node hingedly connected to one end of the gear rack and spaced apart from the second hinge node, and the other is fixedly installed with the gear motor and engaged with the teeth on the gear rack through the gear on the output shaft of the gear motor.

[0184] Please also refer to Figure 43 The angle driving device for driving the first hinge node to rotate the lower front connecting rod 614 is a push rod motor 617, wherein the rear end of the push rod motor 617 is a fixed end and is fixed on the seat cushion mounting bracket through a push rod motor rear mounting screw 6171, and the front end of the push rod motor 617 is a movable end and is hingedly connected to a push rod motor hinge point on the lower front connecting rod 614 through a push rod motor front mounting screw 6172, the push rod motor hinge point is spaced apart from the first hinge node. Therefore, when the push rod motor 617 works, it will drive the push rod motor hinge point to rotate around the first hinge node, thereby driving the lower front connecting rod 614 to rotate relative to the seat cushion mounting bracket.

[0185] In this embodiment, the number of the push rod motor 617 is 2. The push rod motor 617 is a lead screw motor.

[0186] As shown in Figure 44 and Figure 46 In this embodiment, the push rod motor hinge point 6141 on the lower front connecting rod 614 is kept below the first hinge node 6142 between the seat cushion mounting bracket and the lower front connecting rod 614, therefore, the forward movement of the movable end of the push rod motor 617 will drive the lower front connecting rod 614 to rotate upward, that is, the lower front connecting rod 614 undergoes counterclockwise rotation in Figure 46 , thereby driving the front end of the seat cushion frame assembly 611 to rise; and the backward movement of the movable end of the push rod motor 617 will drive the lower front connecting rod 614 to rotate downward, thereby driving the front end of the seat cushion frame assembly 611 to descend.

[0187] As shown in Figure 47As shown in another embodiment, other structural settings are completely identical to the present application, and the only difference is that the push rod motor hinge point 6141 on the lower front connecting rod 614 is kept above the first hinge joint 6142 between the seat cushion mounting bracket and the lower front connecting rod 614, so that the push rod motor 617 is inclinedly arranged, and the movable end of the push rod motor 617 moving forward will drive the lower front connecting rod 614 to rotate downward, that is, the lower front connecting rod 614 rotates clockwise in the direction shown by the arrow in the figure, thereby driving the front end of the seat cushion frame assembly 611 to lower; and the movable end of the push rod motor 617 moving backward will drive the lower front connecting rod 614 to rotate upward, thereby driving the front end of the seat cushion frame assembly 611 to rise. Figure 47 As shown in another embodiment, other structural settings are completely identical to the present application, and the only difference is that the push rod motor hinge point 6141 on the lower front connecting rod 614 is kept above the first hinge joint 6142 between the seat cushion mounting bracket and the lower front connecting rod 614, so that the push rod motor 617 is inclinedly arranged, and the movable end of the push rod motor 617 moving forward will drive the lower front connecting rod 614 to rotate downward, that is, the lower front connecting rod 614 rotates clockwise in the direction shown by the arrow in the figure, thereby driving the front end of the seat cushion frame assembly 611 to lower; and the movable end of the push rod motor 617 moving backward will drive the lower front connecting rod 614 to rotate upward, thereby driving the front end of the seat cushion frame assembly 611 to rise.

[0188] As shown in another embodiment, other structural settings are completely identical to the present application, and the only difference is that the push rod motor hinge point 6141 on the lower front connecting rod 614 is kept above the first hinge joint 6142 between the seat cushion mounting bracket and the lower front connecting rod 614, so that the push rod motor 617 is inclinedly arranged, and the movable end of the push rod motor 617 moving forward will drive the lower front connecting rod 614 to rotate downward, that is, the lower front connecting rod 614 rotates clockwise in the direction shown by the arrow in the figure, thereby driving the front end of the seat cushion frame assembly 611 to lower; and the movable end of the push rod motor 617 moving backward will drive the lower front connecting rod 614 to rotate upward, thereby driving the front end of the seat cushion frame assembly 611 to rise. Figure 48 As shown in another embodiment, other structural settings are completely identical to the present application, and the only difference is that the push rod motor hinge point 6141 on the lower front connecting rod 614 is kept above the first hinge joint 6142 between the seat cushion mounting bracket and the lower front connecting rod 614, so that the push rod motor 617 is inclinedly arranged, and the movable end of the push rod motor 617 moving forward will drive the lower front connecting rod 614 to rotate downward, that is, the lower front connecting rod 614 rotates clockwise in the direction shown by the arrow in the figure, thereby driving the front end of the seat cushion frame assembly 611 to lower; and the movable end of the push rod motor 617 moving backward will drive the lower front connecting rod 614 to rotate upward, thereby driving the front end of the seat cushion frame assembly 611 to rise.

[0189] As shown in another embodiment, other structural settings are completely identical to the present application, and the only difference is that the push rod motor hinge point 6141 on the lower front connecting rod 614 is kept above the first hinge joint 6142 between the seat cushion mounting bracket and the lower front connecting rod 614, so that the push rod motor 617 is inclinedly arranged, and the movable end of the push rod motor 617 moving forward will drive the lower front connecting rod 614 to rotate downward, that is, the lower front connecting rod 614 rotates clockwise in the direction shown by the arrow in the figure, thereby driving the front end of the seat cushion frame assembly 611 to lower; and the movable end of the push rod motor 617 moving backward will drive the lower front connecting rod 614 to rotate upward, thereby driving the front end of the seat cushion frame assembly 611 to rise. Figure 49 As shown in another embodiment, other structural settings are completely identical to the present application, and the only difference is that the push rod motor hinge point 6141 on the lower front connecting rod 614 is kept above the first hinge joint 6142 between the seat cushion mounting bracket and the lower front connecting rod 614, so that the push rod motor 617 is inclinedly arranged, and the movable end of the push rod motor 617 moving forward will drive the lower front connecting rod 614 to rotate downward, that is, the lower front connecting rod 614 rotates clockwise in the direction shown by the arrow in the figure, thereby driving the front end of the seat cushion frame assembly 611 to lower; and the movable end of the push rod motor 617 moving backward will drive the lower front connecting rod 614 to rotate upward, thereby driving the front end of the seat cushion frame assembly 611 to rise.

[0190] Figure 50 As shown in another embodiment, other structural settings are completely identical to the present application, and the only difference is that the push rod motor hinge point 6141 on the lower front connecting rod 614 is kept above the first hinge joint 6142 between the seat cushion mounting bracket and the lower front connecting rod 614, so that the push rod motor 617 is inclinedly arranged, and the movable end of the push rod motor 617 moving forward will drive the lower front connecting rod 614 to rotate downward, that is, the lower front connecting rod 614 rotates clockwise in the direction shown by the arrow in the figure, thereby driving the front end of the seat cushion frame assembly 611 to lower; and the movable end of the push rod motor 617 moving backward will drive the lower front connecting rod 614 to rotate upward, thereby driving the front end of the seat cushion frame assembly 611 to rise. Figure 50 As shown in another embodiment, other structural settings are completely identical to the present application, and the only difference is that the push rod motor hinge point 6141 on the lower front connecting rod 614 is kept above the first hinge joint 6142 between the seat cushion mounting bracket and the lower front connecting rod 614, so that the push rod motor 617 is inclinedly arranged, and the movable end of the push rod motor 617 moving forward will drive the lower front connecting rod 614 to rotate downward, that is, the lower front connecting rod 614 rotates clockwise in the direction shown by the arrow in the figure, thereby driving the front end of the seat cushion frame assembly 611 to lower; and the movable end of the push rod motor 617 moving backward will drive the lower front connecting rod 614 to rotate upward, thereby driving the front end of the seat cushion frame assembly 611 to rise.

[0191] In addition, the seat cushion frame assembly 611 is provided with a bushing 601 at the connecting rod assembly bolt 6131, and a bushing 601 is arranged between the seat cushion cross pipe 6112 and the seat frame side plate 6111, so that the assembly of the entire seat cushion framework 610 is more stable. The top end of the rear connecting rod 615 matches the cross pipe 6112 to realize the articulation of the rear connecting rod and the rear end of the seat cushion frame assembly.

[0192] Therefore, the angle driving device realizes the angular rotation of the lower front connecting rod and the rear connecting rod, so that the rotation range of the seat cushion framework is more flexible, thereby realizing the three functions of zero gravity position adjustment, seat cushion forward folding and seat cushion rear end height adjustment, while preventing the problem of backrest top waist at the zero gravity position.

[0193] Seventh embodiment: foldable seat with zero pressure, in which the rear connecting rod is driven by an angle adjuster and a motor, and the lower front connecting rod is driven by a lead screw motor

[0194] According to the seventh embodiment of the present application, the structure of the adjustable backrest framework is exactly the same as that described above, the structure of the seat cushion framework is basically the same as that of the seat cushion framework 110 of the first embodiment of the present application, and the driving mode of the rear connecting rod includes driving the rear connecting rod by an angle adjuster and a motor, and the difference is only that the driving mode of the front connecting rod is changed to be driven by a lead screw motor.

[0195] As shown in Figure 51 According to the seventh embodiment of the present application, the seat cushion framework 710 includes a seat cushion frame assembly 711 and seat cushion mounting supports 7121, 7122. The front end of the seat cushion frame assembly 711 is articulated with the upper front connecting rod 713, the lower front connecting rod 714 and the seat cushion mounting support in turn, that is, the front end of the seat cushion frame assembly 711 is articulated with one end of the upper front connecting rod 713, the other end of the upper front connecting rod 713 is articulated with one end of the lower front connecting rod 714, and the other end of the lower front connecting rod 714 is articulated with the seat cushion mounting support at a first articulation node. The rear end of the seat cushion frame assembly 711 is articulated with one end of the rear connecting rod 715, and the other end of the rear connecting rod 615 is articulated with the seat cushion mounting support at a second articulation node.

[0196] Since the seat cushion mounting supports 7121, 7122 include a right piece 7121 and a left piece 6122 of the seat cushion mounting support, the number of the upper front connecting rod 713, the lower front connecting rod 714 and the rear connecting rod 715 can be two. The articulation between the upper front connecting rod 713 and the lower front connecting rod 7114, between the lower front connecting rod 714 and the seat cushion mounting support 7121, 7122, and between the rear connecting rod 715 and the seat cushion mounting support 7121, 7122 is realized by a connecting rod assembly bolt 7131.

[0197] That is, as shown in Figure 52As shown in the seventh embodiment of the utility model, the first hinged joint is the hinged joint between the seat cushion mounting bracket and the lower front connecting rod 714, and the second hinged joint is the hinged joint between the seat cushion mounting bracket and the rear connecting rod 715, the mechanism hinged on both sides of the first hinged joint is driven by a lead screw motor, and the mechanism hinged on both sides of the second hinged joint is driven by an angle adjuster and a motor.

[0198] As shown in Figure 51 , Figure 53 and Figure 54 , the angle adjuster 7161 of the angle driving device provided at the second hinged joint between the seat cushion mounting bracket 7121, 7122 and the rear connecting rod 715 is used to directly adjust the angle of the rear connecting rod 715. The shaft center of the angle adjuster 7161 is connected to the seat cushion mounting bracket, and the outer part (i.e. the toothed plate part) of the angle adjuster is connected to the rear connecting rod 715 to rotate synchronously with the rear connecting rod 715. The rear connecting rod 715 is provided with an angle adjuster stop point, and the seat cushion mounting bracket is provided with an angle adjuster stop part 7162 matched with the angle adjuster stop point to limit the adjustable angle range.

[0199] In other embodiments, the second hinged joint can be provided at other positions capable of directly or indirectly adjusting the angle of the rear connecting rod 715, for example, the second hinged joint can be the hinged joint between the rear connecting rod 715 and the seat cushion frame assembly 711.

[0200] The angle driving device further comprises a synchronous rod 7163 inserted into the shaft center of the angle adjuster 7161.

[0201] The two ends of the synchronous rod 7163 are provided with synchronous rod clamping springs 7164, which are used to fix the two ends of the synchronous rod 7163 to the shaft center of the angle adjuster 7161.

[0202] The rear connecting rod 715 is fixedly provided with an angle adjuster motor 7166, and the driving shaft of the angle adjuster motor 7166 is used to drive the synchronous rod 7163 to rotate, thereby driving the shaft center of the angle adjuster 7161 to rotate, so that the seat cushion mounting bracket and the synchronous rod 7163 rotate relatively. The angle adjuster motor 7166 is fixed to one of the rear connecting rods 715 through an angle adjuster motor mounting bracket 7165 and a motor mounting bolt 7167.

[0203] The driving shaft of the angle adjuster motor 7166 can drive the synchronous rod to rotate in the form that the driving shaft and the synchronous rod are provided with teeth that mesh with each other, and the driving shaft of the angle adjuster motor 7166 drives the synchronous rod to rotate through the meshing between the driving shaft and the synchronous rod.

[0204] Please refer to Figure 51The angle driving device for driving the first hinge joint and in turn the lower front connecting rod 714 is a push rod motor 717. The rear end of the push rod motor 717 is a fixed end and is fixed on the seat cushion mounting support through a push rod motor rear mounting screw 7171. The front end of the push rod motor 717 is a movable end and is hinged to the push rod motor hinge point on the lower front connecting rod 714 through a push rod motor front mounting screw 7172. The push rod motor hinge point is spaced apart from the first hinge joint. Therefore, when the push rod motor 717 works, it will push the push rod motor hinge point to rotate around the first hinge joint, thus driving the lower front connecting rod 714 to rotate relative to the seat cushion mounting support.

[0205] In the present embodiment, the number of the push rod motors 717 is 2. The push rod motor 717 is a lead screw motor.

[0206] As shown in Figure 52 and Figure 55 In the present embodiment, the push rod motor hinge point 7141 on the lower front connecting rod 714 is indirectly hinged to the push rod motor 717 through an additional hinge rod, so that the main shaft of the push rod motor 717 is kept below the first hinge joint 7142. Therefore, when the movable end of the push rod motor 717 moves forward, it will drive the lower front connecting rod 714 to rotate upward, i.e. the lower front connecting rod 714 rotates counterclockwise in Figure 55 , thus driving the front end of the seat cushion frame assembly 711 to rise. When the movable end of the push rod motor 717 moves backward, it will drive the lower front connecting rod 714 to rotate downward, thus driving the front end of the seat cushion frame assembly 711 to descend.

[0207] As shown in Figure 56 In another embodiment, other structural arrangements are exactly the same as those of the seventh embodiment of the present application, and the only difference is that the push rod motor hinge point 7141 on the lower front connecting rod 714 is indirectly hinged to the push rod motor 717 through an additional hinge rod, so that the main shaft of the push rod motor 717 is kept above the first hinge joint 7142. Therefore, when the movable end of the push rod motor 717 moves forward, it will drive the lower front connecting rod 714 to rotate downward, i.e. the lower front connecting rod 714 rotates clockwise in Figure 56 , thus driving the front end of the seat cushion frame assembly 711 to descend. When the movable end of the push rod motor 717 moves backward, it will drive the lower front connecting rod 714 to rotate upward, thus driving the front end of the seat cushion frame assembly 711 to rise.

[0208] As shown in Figure 57As shown, in the embodiment, the number of the upper front connecting rods 713 is two, and the middle parts of the two upper front connecting rods 713 are connected together through the upper front connecting rod cross pipe 7132 to further ensure the synchronous rotation of the two upper front connecting rods 713. The upper front connecting rod 713 is provided with a bushing 701 at the hinged joint with the lower front connecting rod 714, so that the assembly is more stable.

[0209] As shown, Figure 58 As shown, in the embodiment, the number of the lower front connecting rods 714 is two, which are the left and right pieces of the lower front connecting rods. Among them, the two lower front connecting rods 714 are connected together through the first lower front connecting rod cross pipe 7144 and the second lower front connecting rod cross pipe 7145; the second lower front connecting rod cross pipe 7145 is used to further ensure the synchronous rotation of the two lower front connecting rods 714; the first lower front connecting rod cross pipe 7144 is arranged at the push rod motor hinged joint 7141 and is provided with a push rod motor support 7146 connected with the movable end of the push rod motor 717, so that the hinging of the push rod motor 717 and the lower front connecting rod 714 at the push rod motor hinged joint 7141 is realized through the first lower front connecting rod cross pipe 7144.

[0210] Figure 59 The specific structure of the seat cushion frame assembly 711 is shown. As shown, Figure 59 The seat cushion frame assembly 711 includes seat frame side plates 7111 on the left and right sides, a seat cushion cross pipe 7112 connected between the rear ends of the two seat frame side plates 7111, a diving tube 7113 connected between the front ends of the two seat frame side plates 7111, a diving tube support 7114 sleeved on the diving tube 7113, and a seat cushion half-pot 7116 arranged on the diving tube support 7114.

[0211] In addition, the seat cushion frame assembly 711 is provided with a bushing 701 at the connecting rod assembly bolt, and a bushing 701 is arranged between the seat cushion cross pipe 7112 and the seat frame side plate 7111, so that the assembly of the entire seat cushion framework 610 is more stable. The top end of the rear connecting rod 715 matches the cross pipe 7112 to realize the hinging of the rear connecting rod and the rear end of the seat cushion frame assembly.

[0212] Therefore, the angle driving device realizes the angular rotation of the lower front connecting rod and the rear connecting rod, so that the rotation range of the seat cushion framework is more flexible, thereby realizing the three functions of zero gravity position adjustment, seat cushion forward folding, and seat cushion rear end height adjustment, while preventing the problem of backrest top waist at the zero gravity position.

[0213] The above merely describes preferred embodiments of the present application, and is not intended to limit the scope of the present application, and the above embodiments of the present application can be variously changed. Any simple, equivalent changes and modifications made according to the content of the claims and the specification of the present application fall within the scope of the claims of the present application. The present application is not described in detail, and is conventional technical content.

Claims

1. A foldable zero-pressure seat, characterized by, The seat cushion framework includes a seat cushion framework assembly, a front end of the seat cushion framework assembly is hingedly connected with an upper front connecting rod, a lower front connecting rod and a seat cushion mounting support in sequence, a rear end of the seat cushion framework assembly is hingedly connected with one end of a rear connecting rod, and the other end of the rear connecting rod is hingedly connected with the seat cushion mounting support, so as to form a hinged joint; Angle driving devices are arranged at the two hinged joints of the seat cushion framework, so as to drive the seat to switch among a normal posture, a zero-pressure posture and a folding posture; in the normal posture, the rear connecting rod is inclined backward, and the lower front connecting rod is inclined; in the zero-pressure posture, the angles of the rear connecting rod and the lower front connecting rod are such that the rear end and the front end of the seat cushion framework assembly are higher than those in the normal posture; in the process of switching from the normal posture to the folding posture, the angle driving device drives the lower front connecting rod to rotate relative to the seat cushion mounting support, and simultaneously, the angle driving device drives the rear connecting rod to incline forward, and through the seat cushion framework assembly, the upper front connecting rod is driven to rotate relative to the lower front connecting rod.

2. The foldable zero-pressure seat of claim 1, wherein, The angle driving devices are respectively used for driving the first hinged joint and the second hinged joint, the angle driving device used for driving the first hinged joint directly or indirectly adjusts the angle of the lower front connecting rod, and the angle driving device used for driving the second hinged joint directly or indirectly adjusts the angle of the rear connecting rod.

3. The foldable zero-pressure seat of claim 2, wherein, The first hinged joint is a hinged joint between the seat cushion mounting support and the lower front connecting rod, a hinged joint between the lower front connecting rod and the upper front connecting rod or a hinged joint between the seat cushion framework assembly and the upper front connecting rod; The second hinged joint is a hinged joint between the seat cushion mounting support and the rear connecting rod or a hinged joint between the seat cushion framework assembly and the rear connecting rod.

4. The foldable zero-pressure seat of claim 2, wherein, The angle driving device used for driving the first hinged joint includes one of the following: a1) an angle adjuster arranged at the first hinged joint; a2) a stepped bolt arranged at the first hinged joint and a direct-connection motor driving the stepped bolt to rotate, the stepped bolt and the direct-connection motor are respectively fixed relative to different mechanisms hingedly connected on two sides of the first hinged joint; a3) a rack and pinion motor, one of two relatively rotatable mechanisms hingedly connected on two sides of the first hinged joint is provided with a rack hinged joint hingedly connected with one end of the rack and spaced apart from the first hinged joint, and the other is fixedly provided with the pinion motor and is engaged with the teeth of the rack through the gear on the output shaft of the pinion motor; a4) a push rod motor, one of two relatively rotatable mechanisms hingedly connected on two sides of the first hinged joint is fixedly provided with a fixed end of the push rod motor, and the other is provided with a push rod motor hinged joint hingedly connected with a movable end of the push rod motor and spaced apart from the first hinged joint.

5. The foldable zero-pressure seat of claim 4, wherein, When the angle driving device used for driving the first hinged joint includes the rack and pinion motor and the first hinged joint is a hinged joint between the seat cushion mounting support and the lower front connecting rod, the rack hinged joint is arranged on one of the seat cushion mounting support and the lower front connecting rod, and the pinion motor is arranged on the other.

6. The foldable zero-pressure seat of claim 1, wherein, The angle driving device used for driving the second hinged joint includes one of the following: b1) an angle adjuster arranged at the second hinged joint; b2) a step bolt arranged at the second hinge joint and a direct connection motor for driving the step bolt to rotate, the step bolt and the direct connection motor are fixed relative to different mechanisms hinged on two sides of the second hinge joint respectively; b3) a rack and pinion motor, one of the two opposite rotatable mechanisms hinged on two sides of the second hinge joint is provided with a rack joint node hinged with one end of the rack and spaced apart from the second hinge joint, and the other is fixedly provided with the pinion motor and is engaged with the teeth on the rack through the pinion on the output shaft of the pinion motor; b4) a push rod motor, one of the two opposite rotatable mechanisms hinged on two sides of the second hinge joint is fixedly provided with a fixed end of the push rod motor, and the other is provided with a push rod motor joint node hinged with a movable end of the push rod motor and spaced apart from the second hinge joint.

7. The foldable zero-pressure seat of claim 6, wherein, When the angle driving device for driving the second hinge joint includes a rack and pinion motor, and the second hinge joint is the hinge joint between the seat mounting bracket and the rear link, the rack joint node is arranged on one of the seat mounting bracket and the rear link, and the pinion motor is arranged on the other.

8. The foldable zero-pressure seat of claim 4 or 6, wherein, For the angle driving device using the angle adjuster, it further includes a synchronization rod inserted into the shaft center of the angle adjuster and an angle adjuster motor, the driving shaft of the angle adjuster motor is used to drive the corresponding synchronization rod to rotate, thereby driving the shaft center of the angle adjuster to rotate.

9. The foldable zero-pressure seat of claim 8, wherein, The driving shaft of the angle adjuster motor and the synchronization rod are provided with teeth that mesh with each other, and the driving shaft of the angle adjuster motor drives the synchronization rod to rotate through the meshing between the driving shaft of the angle adjuster motor and the synchronization rod.

10. The foldable zero-pressure seat of claim 4 or 6, wherein, For the angle driving device using the push rod motor, The push rod motor joint node is located below the corresponding first or second hinge joint, or the push rod motor joint node is connected to the push rod motor through a hinge rod, so that the main shaft of the push rod motor is located below the corresponding first or second hinge joint of the push rod motor joint node; thereby, the seat cushion frame assembly is lifted by the pushing of the push rod motor; Or, the push rod motor joint node is located above the corresponding first or second hinge joint, or the push rod motor joint node is connected to the push rod motor through a hinge rod, so that the main shaft of the push rod motor is located above the corresponding first or second hinge joint of the push rod motor joint node; thereby, the seat cushion frame assembly is lowered by the pushing of the push rod motor.

11. The foldable zero-pressure seat of claim 6, wherein, When the two opposite rotatable mechanisms hinged on two sides of the first hinge joint are the seat mounting bracket and the lower front link respectively, the first lower front link cross pipe is connected between the two lower front links, the first lower front link cross pipe is arranged at the push rod motor joint node and is provided with a push rod motor bracket connected with the movable end of the push rod motor, so that the push rod motor and the lower front link are hinged at the push rod motor joint node through the first lower front link cross pipe.

12. The foldable zero-pressure seat of claim 1, wherein, Further comprising an adjustable backrest framework arranged separately from the seat cushion framework; In the normal posture, the adjustable backrest skeleton is in a first backrest angle of backward inclination; in the zero pressure posture, the adjustable backrest skeleton is in a second backrest angle of backward inclination and the inclination angle is greater than the first backrest angle, and the lower part is in contact with the rear end of the seat cushion skeleton; in the folding posture, the adjustable backrest skeleton is in a third backrest angle of forward inclination.

13. The foldable zero-pressure seat of claim 11, wherein, The safety belt is also included, and the lower fixing point and the buckle mounting point of the safety belt are located on both sides of the seat cushion mounting support, and the upper fixing point of the safety belt is located on the side of the adjustable backrest skeleton.

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