CN219306336U - Height adjusting mechanism of seat - Google Patents

Abstract

The utility model discloses a height adjusting mechanism of a seat, which comprises a seat cushion and an electric screw rod mechanism, wherein the seat cushion is hinged on a seat cushion bracket through a front connecting rod and a rear connecting rod; the reduction gearbox in the electric screw rod mechanism is rotatably mounted on the fixed base, the motor in the electric screw rod mechanism drives the screw rod to move through the reduction gearbox, and meanwhile, the screw rod and the motor rotate around the fixed base, and meanwhile, the screw rod rotates with the hinge point of the cushion support, and simultaneously, the screw rod rotates around the hinge point of the cushion and the cushion support together with the rear connecting rod, so that the cushion can synchronously rotate with the cushion support, and the height of the cushion can be adjusted. Compared with the prior art, the utility model has the advantages of simple assembly, less parts, light weight and small arrangement space requirement.

Description

Height adjusting mechanism of seat

Technical Field

The utility model relates to the technical field of seats, in particular to a height adjusting mechanism of a seat.

Background

In order to meet the requirement of a movement mechanism for adjusting the height of a seat, a new rotation point (a bracket and a fastener) is additionally added in the existing screw rod driving height adjusting mechanism to meet the transmission requirement, and the structure is relatively complex and the cost is high.

For example, a novel automobile seat height adjusting mechanism disclosed in Chinese patent application publication No. CN210591493U comprises two seat frame side plates which are oppositely arranged, a seat basin framework is arranged between the two seat frame side plates, two sides of the rear part of the seat basin framework are respectively hinged with the corresponding seat frame side plates, two sides of the front part of the seat basin framework are respectively connected with the corresponding seat frame side plates through height adjusting components, the height adjusting components are connected with power devices, the power devices drive the height adjusting components to act, so that the front end of the seat basin framework is lifted or lowered.

In addition, a double-shaft motor is transversely fixed between upper slide rails in lower slide rails which are slidably arranged on a vehicle body bottom plate, the left output end and the right output end of the double-shaft motor are connected with gear boxes which are fixed at the two ends, the vertical output of the gear boxes is connected with a height-adjusting connecting rod, and the height-adjusting connecting rod is connected with a rear rocker which is rotatably connected with the upper slide rails; the upper end of the rear rocker is connected with a seat cushion rear transverse pipe, the seat cushion rear transverse pipe is connected with the upper end of the front rocker through a side plate, and the lower end of the front rocker is rotationally connected with the upper sliding rail; the rear rocker, the side plates, the front rocker and the upper sliding rail jointly form a double-rocker mechanism; the seat cushion is mounted between the side panels. The double-shaft motor drives the rear rocker to rotate through the gear box and the heightening connecting rod, so that the double-rocker mechanism is pushed to drive the seat cushion arranged between the side plates, and the aim of adjusting the seat height is fulfilled; the gear boxes at two ends of the double-shaft motor are worm reducers, and the double-side worm reducers have a symmetrical locking self-locking function.

In combination with the requirement of the current zero gravity seat on the seat block value, the screw rod motor is arranged below the seat cushion, and the motor is arranged below the seat cushion to occupy the block space of the seat.

There is also a relaxing comfort seat for a vehicle disclosed in chinese patent application publication No. CN113492736a, which implements cushion rear-lift, overall lift and multi-angle tilt through at least three motors, wherein a combination of a rear-end lift motor and a front-end tilt motor implements multi-angle adjustment of the cushion, and tilt motors used in both front and rear achieve height adjustment of the cushion front and rear.

An assembly of a vehicle seat is disclosed in german patent DE102020112388A1, comprising a seat frame with at least one frame portion forming a surface portion, and a drive device with a spindle and a drive device. An adjustment gear, wherein the adjustment mechanism has a housing for adjusting the spindle in an adjustment direction relative to the longitudinal direction of the housing to achieve an adjustment force on the mount. The drive device has a bearing portion provided on the housing, the frame portion has a bearing opening formed in the surface portion, and the bearing portion is accommodated in the bearing opening such that the housing is pivotable about the pivot shaft relative to the frame portion.

German patent DE102020208832A1 discloses a vehicle seat assembly comprising a seat subassembly, a floor assembly, a front pivot member pivotally connected to the seat chair assembly at a front upper pivot point, and a rear a pivot member pivotally coupled to the seat bottom assembly at a rear upper pivot point. The drive has a linear member and a gear member operatively connected to the linear member. In the first end position the linear element forms a first angle with an imaginary line extending through the front upper pivot point and the rear upper pivot point and in the second end position a second angle with the line, wherein the linear element is arranged in an intermediate position at right angles to the line and exceeds the right angle during adjustment between the two.

The above patent basically adopts the structure shown in fig. 1, and when the motor 1 drives the screw rod 2 to horizontally move, the connecting rod 3 is driven to overturn around the hinge point B through the hinge point A, and meanwhile, the rear connecting rod 4 rotates around the hinge point C and the hinge point D, so that the seat cushion is lifted and lowered, and the height adjusting movement of the seat is realized. Thus, these patents have the following problems: 1. the assembly is complex, and the number of parts is large; 2. the weight is large; 3. the arrangement space requirement is large.

Disclosure of Invention

The technical problem to be solved by the utility model is to provide a height adjusting mechanism of a seat, which is simple to assemble, has a small number of parts, is light in weight and has small arrangement space requirement, aiming at the defects of the prior seat height adjusting structure.

In order to achieve the above object, the height adjusting mechanism of the seat of the present utility model comprises a seat cushion and an electric screw rod mechanism, wherein the seat cushion is hinged on the seat cushion bracket through a front connecting rod and a rear connecting rod; the reduction gearbox in the electric screw rod mechanism is rotatably mounted on the fixed base, the motor in the electric screw rod mechanism drives the screw rod to move through the reduction gearbox, meanwhile, the screw rod and the motor rotate around the fixed base, the screw rod rotates with the hinge point of the cushion support, and simultaneously, the screw rod and the rear connecting rod rotate together with the rear connecting rod around the hinge point of the rear connecting rod, the cushion and the cushion support, so that the cushion can synchronously rotate through the cushion support, and the height adjustment of the cushion is realized.

In a preferred embodiment of the present utility model, the hinge point of the rear link and the cushion bracket is located above and in front of the hinge point of the screw rod and the cushion bracket.

In a preferred embodiment of the present utility model, the hinge point of the rear link rod and the cushion bracket and the hinge point of the screw rod and the cushion bracket are both implemented by using one step bolt.

In a preferred embodiment of the utility model, a nut with a flange edge is arranged at the end of the screw rod, which is far away from the hinge joint of the screw rod and the cushion bracket, and the flange edge is used for adjusting the blocking point of the final position in height.

In a preferred embodiment of the utility model, the hinge point of the rear link and the seat cushion is coaxial with the rear tube.

In a preferred embodiment of the present utility model, the seat cushion comprises a pair of side plates, both ends of the rear pipe are connected with the pair of side plates in an anchoring manner, and one end of the rear connecting rod is rotatably sleeved on the rear pipe so as to form a hinge point of the rear connecting rod and the seat cushion.

In a preferred embodiment of the utility model, the front connecting rod and the rear connecting rod are both a pair and are respectively arranged at two sides of the seat, the electric screw rod mechanisms are also a pair, and the motor box bodies in the pair of electric screw rod mechanisms are respectively arranged on the pair of rear connecting rods.

In a preferred embodiment of the present utility model, the seat cushion bracket is replaced with a slide rail upper rail.

In a preferred embodiment of the present utility model, the electric screw mechanism is one, and the fixed base of the one electric screw mechanism is fixed on the rear connecting rod at one side.

In a preferred embodiment of the utility model, the electric screw rod mechanism is one and further comprises a screw rod mechanism, a fixed base in the electric screw rod mechanism is fixed on a rear connecting rod on one side, a fixed base in the screw rod mechanism is fixed on a rear connecting rod on the other side, a motor of the electric screw rod mechanism is a double-output motor, the motor is connected with a power input end of the screw rod mechanism on the other side through a synchronous rod, the motor drives a reduction gearbox in the screw rod mechanism to work through the synchronous rod while driving a reduction gearbox in the electric screw rod mechanism to work, and the reduction gearbox in the electric screw rod mechanism and the reduction gearbox in the screw rod mechanism simultaneously drive a screw rod in the electric screw rod mechanism and a screw rod in the screw rod mechanism to move.

In a preferred embodiment of the utility model, a first locking structure and a second locking structure are arranged in a fixed base of the electric screw rod mechanism, the position of the first locking structure corresponds to the lowest position of the whole seat, the position of the second locking structure corresponds to the highest position of the whole seat, and after the whole seat is at the lowest position and the motor stops running, the first locking structure locks a reduction gearbox in the electric screw rod mechanism on the fixed base in the electric screw rod mechanism; when the whole seat is at the highest position and the motor in the electric screw rod mechanism stops running, the second locking structure locks the reduction gearbox in the electric screw rod mechanism on the fixed base in the electric screw rod mechanism.

In a preferred embodiment of the utility model, a third locking structure and a fourth locking structure are also arranged in the fixed base of the screw rod mechanism, wherein the position of the third locking structure corresponds to the highest position of the whole seat, the position of the fourth locking structure corresponds to the lowest position of the whole seat, and after the whole seat is in the highest position and the motor stops running, the third locking structure locks a reduction gearbox in the screw rod mechanism on the fixed base in the screw rod mechanism; when the whole seat is at the highest position and the motor stops running, the fourth locking structure locks the reduction gearbox in the screw rod mechanism on the fixed base in the screw rod mechanism. Due to the adoption of the technical scheme, compared with the prior art, the utility model has the advantages of simple assembly, less parts, light weight and small arrangement space requirement.

Drawings

Fig. 1 is a schematic view of the working principle of a seat height adjusting structure in the prior art.

Fig. 2 is an installation perspective view of the height adjusting mechanism of the present utility model.

Fig. 3 is an installation elevation view of the height adjustment mechanism of the present utility model.

Fig. 4 is an enlarged schematic view at I of fig. 3.

Fig. 5 is an exploded view of the installation of a height adjustment mechanism of the present utility model.

Fig. 6 is a perspective view of the electric screw mechanism of the present utility model from one direction.

Fig. 7 is a perspective view of the electric screw mechanism of the present utility model from another direction.

Fig. 8 is an exploded view of the electric screw mechanism of the present utility model as seen from one direction.

Fig. 9 is an exploded view of the electric screw mechanism of the present utility model from another direction.

Fig. 10 is a perspective view of the seat cushion in the lowest position.

Fig. 11 is an enlarged schematic view at I of fig. 10.

Fig. 12 is a front view of the seat cushion in a lowermost position.

Fig. 13 is an enlarged schematic view at I of fig. 12.

Fig. 14 is one of the schematic diagrams of the principle of the seat cushion in the lowest position.

Fig. 15 is a second schematic view of the cushion in the lowest position.

Fig. 16 is a third schematic view of the cushion in the lowest position.

Fig. 17 is a schematic diagram of the cushion in the lowest position.

Fig. 18 is a perspective view of the seat cushion in the highest position.

Fig. 19 is an enlarged schematic view at I of fig. 18.

Fig. 20 is a front view of the seat cushion in a lowermost position.

Fig. 21 is an enlarged schematic view at I of fig. 20.

Fig. 22 is one of the schematic diagrams of the principle of the seat cushion in the highest position.

Fig. 23 is one of the schematic diagrams of the principle of the seat cushion in the highest position.

Fig. 24 is a schematic view of the height adjustment mechanism of the present utility model employing a single-sided motor to achieve double-sided locking of the seat in the lowermost position.

Fig. 25 is an a-direction view of fig. 24.

Fig. 26 is a B-direction view of fig. 24.

Fig. 27 is a schematic diagram of the connection of an electric screw mechanism on one side and a screw mechanism on the other side by a synchronizing rod.

Fig. 28 is a schematic view of the height adjustment mechanism of the present utility model employing a single-sided motor to achieve double locking of the seat in the uppermost position.

Fig. 29 is an a-direction view of fig. 28.

Fig. 30 is a B-direction view of fig. 28.

Fig. 31 is a schematic view of the height adjustment mechanism of the present utility model employing a single-sided motor to achieve single-sided locking of the seat in the lowermost position.

Fig. 32 is a view in the a direction of fig. 31.

Fig. 33 is a B-direction view of fig. 31.

Fig. 34 is a schematic view of the height adjustment mechanism of the present utility model employing a single-sided motor to achieve single-sided locking of the seat in the uppermost position.

Fig. 35 is an a-direction view of fig. 34.

Fig. 36 is a B-direction view of fig. 34.

Detailed Description

The utility model is further described below with reference to the drawings and detailed description.

Example 1

This embodiment is a double sided motor double lock. Referring to fig. 2 to 23, the height adjustment mechanism of the seat shown in the drawings includes a seat cushion and a pair of electric screw mechanisms 20. The cushion comprises a sitting basin 10, the sitting basin 10 comprises a sitting basin front plate 11, a pair of side plates 12 and a rear pipe 13, the left side and the right side of the sitting basin front plate 11 are welded at the front ends of the pair of side plates 12, and the left end and the right end of the rear pipe 13 are anchored at the rear ends of the pair of side plates 12.

The height adjustment of the seat cushion is performed by a pair of front links 30, a pair of rear links 40 and a pair of electric screw mechanisms 20, as follows:

the structure described below is based on the seat cushion being mounted on the upper rail 51 of the pair of rails 50, but it is needless to say that a pair of seat cushion brackets or a seat cushion bracket may be employed instead of the pair of rails 50.

The front ends of the pair of side plates 12 are hinged to the upper ends of the pair of front links 30 by means of step bolts 31, and the lower ends of the pair of front links 30 are hinged to the front ends of the upper slide rails 51 by means of a pair of step bolts 32.

The upper ends of the pair of rear connecting rods 40 are rotatably sleeved at the left end and the right end of the rear pipe 13 to form a hinge point of the pair of rear connecting rods 40 and the cushion, so that the hinge point of the pair of rear connecting rods 40 and the cushion is coaxial with the rear pipe 13. The lower ends of the pair of rear links 40 are hinged to the rear ends of the upper slide rails 51 by step screws 41, forming hinge points of the rear links 40 and the upper slide rails 51.

By adopting the above technical means, the seat cushion is hinged on the upper slide rail 51 of the pair of slide rails 50 through the pair of front links 30 and the pair of rear links 40.

Referring to fig. 6 to 9 in particular, the electric screw mechanism 20 includes a fixed base 21, a reduction gearbox 22, a motor 23 and a screw 24, the reduction gearbox 22 is rotatably installed in the fixed base 21 and can rotate around a rotation point 27 between the reduction gearbox 22 and the fixed base 21, the motor 23 is installed on the reduction gearbox 22, a power output end of the motor 23 is in driving connection with a power input end of the reduction gearbox 22, and a power input end of the reduction gearbox 22 is in driving connection with the screw 24, so that the motor 23 can drive the screw 24 to move through the reduction gearbox 22.

A screw tap is provided at the head of the screw 24 (i.e., at the end to be hinged with the upper slide rail 51), a screw connector 25 is screwed on the screw tap, and an inner hole 25a is provided in the screw connector 25. A nut 26 with a flange 26a is fixed to the end of the spindle 25 (i.e. the end remote from the spindle connection 25), the flange 26a being used for height adjustment of the stop in the final position.

Referring particularly to fig. 3, a pair of motorized lead screw mechanisms 20 are mounted on a pair of rear links 40, respectively, in the following manner: the fixed base 21 in the electric screw mechanism 20 is fixed to the rear link 40 by three connecting bolts 21 a.

The hinge manner of the screw 24 and the upper slide rail 51 in the electric screw mechanism 20 is as follows: a step bolt 25b is screwed on the upper slide rail 51 through the inner hole 25a of the screw rod connector 25 to form a hinge point of the screw rod 24 and the upper slide rail 51. The hinge point of the rear connecting rod 40 and the upper slide rail 51 is positioned in front of and above the hinge point of the screw 24 and the upper slide rail 51.

The working principle of the utility model is as follows:

since the motor 23 and the reduction gearbox 22 in the electric screw mechanism 20 are rotatably mounted in the fixed base 21, when it is desired to adjust the seat cushion height, the motor 23 is started, at which time the motor 23 drives the screw 24 through the reduction gearbox 22 on the one hand and the motor 23 and the reduction gearbox 22 on the other hand rotate about the rotation point 27 between the reduction gearbox 22 and the fixed base 21. Meanwhile, the screw rod 24 rotates around the hinging point of the screw rod 24 and the upper sliding rail 51, namely the step bolt 25b, and simultaneously drives the rear connecting rod 40 to rotate around the hinging point of the screw rod 41 and the seat cushion, namely the step screw 41, through the fixed base 21, and the front side of the seat cushion is hinged with the front end of the upper sliding rail 51 through the front connecting rod 30, so that synchronous rotation of the seat cushion above the sliding rail 51 can be realized, and the height adjustment of the seat cushion is realized.

The utility model can also be changed as follows:

example 2

This embodiment is a single sided motor double lock. Referring to fig. 24-30, the other side electric screw mechanism 20 is replaced with a screw mechanism 60, and the other side screw mechanism 60 is installed in substantially the same manner as the one side electric screw mechanism 20, except that the motor 23 is not provided. The motor 23 of one side of the electric screw mechanism 20 is a dual output motor, and is connected to the power input end of the other side of the screw mechanism 60 through a synchronizing rod 70, the fixed base 21 of the electric screw mechanism 20 is fixed to the one side of the rear link 40 in the above-described mounting manner, and the fixed base 61 of the screw mechanism 60 is also fixed to the other side of the rear link 40 in the above-described mounting manner.

The motor 23 drives the reduction gearbox 22 to work and simultaneously drives the reduction gearbox 62 in the screw rod mechanism 60 to work through the synchronous rod 70, and the reduction gearbox 22 and the reduction gearbox 62 simultaneously drive the screw rod 24 and the screw rod 64 to move; meanwhile, the screw rod 24 and the screw rod 64 rotate around the hinging point of the screw rod 24 and the upper sliding rail 51, namely the step bolt 25b, in the moving process, the screw rod 24 and the screw rod 64 rotate around the hinging point of the screw rod 24 and the upper sliding rail 51, namely the step bolt 25b, and meanwhile, the fixed base 21 and the fixed base 61 drive the rear connecting rod 40 to rotate around the hinging point of the screw rod 41 and the seat cushion, namely the rear pipe 13, and the front side of the seat cushion is hinged with the front end of the upper sliding rail 51 through the front connecting rod 30, so that the seat cushion can synchronously rotate based on the upper sliding rail 51, and the height adjustment of the seat cushion is realized.

The locking structures 21b, 21c (the aforementioned first locking structure and second locking structure) are provided in the fixed base 21 of the electric screw mechanism 20, while the locking structures 61a, 61b (the aforementioned third locking structure and fourth locking structure) are also provided in the fixed base 61 of the screw mechanism 60, wherein the positions of the locking structures 21b and 61a correspond to the position where the entire seat is at the lowest position, the positions of the locking structures 21c and 61b correspond to the position where the entire seat is at the highest position, and the locking structures 21b and 61a lock the reduction gearbox 22 in the electric screw mechanism 20 and the reduction gearbox 62 in the screw mechanism 60 to the fixed base 21 and the fixed base 61 after the entire seat is at the lowest position and the motor 23 stops (see fig. 24 to 26). When the entire seat is at the highest position and the motor 23 stops operating, the lock structure 21c and the lock structure 61b lock the reduction gearbox 22 and the reduction gearbox 62 in the screw mechanism 60 to the fixed base 21 and the fixed base 61 (see fig. 28 to 30).

Example 3

This embodiment is a single-sided motor single-sided lock. Referring to fig. 31 to 36, the electric screw mechanism 20 is one, the motor 23 in one electric screw mechanism 20 drives the reduction gearbox 22 to work, the reduction gearbox 22 drives the screw 24 to move, meanwhile, the screw 24 rotates around the hinge point of the screw 24 and the upper sliding rail 51, namely the step bolt 25b, in the moving process, the screw 24 rotates around the hinge point of the screw 24 and the upper sliding rail 51, namely the step bolt 25b, and simultaneously, the fixed base 21 drives the rear connecting rod 40 to rotate around the hinge point of the screw 41 and the seat cushion, namely the rear pipe 13, and simultaneously, the rear pipe 13 transmits the movement to the rear connecting rod 12 at the other side, and the rear connecting rod 40 at the other side also rotates around the hinge point of the screw 41 and the seat cushion, namely the front side of the seat cushion and the front end of the upper sliding rail 51 are hinged through the front connecting rod 30, so that the seat cushion can synchronously rotate based on the upper sliding rail 51, and the height adjustment of the seat cushion can be realized.

The locking structures 21b and 21c are provided in the fixed base 21 of the electric screw mechanism 20, the position of the locking structure 21b corresponds to the position where the entire seat is at the lowest position, the position of the locking structure 21c corresponds to the position where the entire seat is at the highest position, and the locking structure 21b locks the reduction gearbox 22 to the fixed base 21 after the entire seat is at the lowest position and the motor 23 stops running (see fig. 31 to 33). When the entire seat is at the highest position and the motor 23 stops, the lock structure 21c locks the reduction gearbox 22 to the fixed base 21 (see fig. 34 to 36).

Claims (13)

1. The seat height adjusting mechanism comprises a seat cushion and an electric screw rod mechanism, wherein the seat cushion is hinged on a seat cushion bracket through a front connecting rod and a rear connecting rod; the reduction gearbox in the electric screw rod mechanism is rotatably mounted on the fixed base, the motor in the electric screw rod mechanism drives the screw rod to move through the reduction gearbox, the screw rod and the motor rotate around the fixed base, the screw rod rotates with the hinge point of the cushion support, and simultaneously together with the rear connecting rod rotates around the hinge point of the rear connecting rod, the cushion and the cushion support, so that the cushion synchronously rotates with the cushion support, and the height of the cushion is adjusted.

2. A seat height adjustment mechanism as set forth in claim 1 wherein said rear link is displaced from the hinge point of said seat cushion bracket forward and upward of the hinge point of said lead screw and said seat cushion bracket.

3. A seat height adjustment mechanism as set forth in claim 2 wherein said rear link and cushion bracket hinge points and said lead screw and cushion bracket hinge points are each accomplished with a single step bolt.

4. A seat height adjustment mechanism as set forth in claim 1 wherein a nut having a flange is provided at an end of said lead screw remote from said lead screw which is hinged to said seat cushion bracket, said flange serving to adjust the final position of the stop.

5. A seat height adjustment mechanism as set forth in claim 1 wherein said rear link is coaxial with said seat cushion at a hinge point thereof.

6. A seat height adjustment mechanism as set forth in claim 5 wherein said seat cushion includes a pair of side plates, said rear tube being fixedly connected at both ends to said pair of side plates, one end of said rear link rotatably sleeved on said rear tube to form a hinge point of said rear link with said seat cushion.

7. A height adjustment mechanism for a seat as set forth in claim 6 wherein said front and rear links are each a pair and are disposed on opposite sides of the seat, said pair of motorized screw mechanisms being provided, and wherein the motor housings of the pair of motorized screw mechanisms are mounted on the pair of rear links, respectively.

8. A seat height adjustment mechanism as set forth in claim 7 wherein said seat cushion bracket is replaced with a slide track upper rail.

9. A height adjustment mechanism for a seat as claimed in any one of claims 1 to 8 wherein said electrically powered screw mechanism is one in which the fixed base is fixed to a rear link on one side.

10. A height adjustment mechanism for a seat as claimed in any one of claims 1 to 8 wherein said electric screw mechanism is one and further comprising a screw mechanism, wherein a fixed base in the electric screw mechanism is fixed to a rear link on one side and a fixed base in the screw mechanism is fixed to a rear link on the other side, wherein the motor of the electric screw mechanism is a dual output motor connected to the power input end of the screw mechanism on the other side via a synchronizing rod, and wherein the motor drives the reduction gearbox in the screw mechanism to operate via the synchronizing rod while driving the reduction gearbox in the electric screw mechanism to move simultaneously with the reduction gearbox in the electric screw mechanism and the screw in the screw mechanism.

11. A height adjustment mechanism for a seat as claimed in any one of claims 1 to 8 wherein a first locking structure and a second locking structure are provided in the fixed base of the electric screw mechanism, the first locking structure being located at a position corresponding to the position of the entire seat being at a lowermost position, the second locking structure being located at a position corresponding to the position of the entire seat being at a lowermost position, the first locking structure locking the reduction gearbox of the electric screw mechanism to the fixed base of the electric screw mechanism after the entire seat is at the lowermost position and the motor is stopped; when the whole seat is at the highest position and the motor in the electric screw rod mechanism stops running, the second locking structure locks the reduction gearbox in the electric screw rod mechanism on the fixed base in the electric screw rod mechanism.

12. The seat height adjusting mechanism according to claim 9, wherein a first locking structure and a second locking structure are provided in the fixed base of the electric screw mechanism, the position of the first locking structure corresponds to the position of the whole seat being at the lowest position, the position of the second locking structure corresponds to the position of the whole seat being at the highest position, and the first locking structure locks the reduction gearbox in the electric screw mechanism on the fixed base in the electric screw mechanism after the whole seat is at the lowest position and the motor stops running; when the whole seat is at the highest position and the motor in the electric screw rod mechanism stops running, the second locking structure locks the reduction gearbox in the electric screw rod mechanism on the fixed base in the electric screw rod mechanism.

13. The seat height adjusting mechanism according to claim 10, wherein a first locking structure and a second locking structure are provided in the fixed base of the electric screw mechanism, the position of the first locking structure corresponds to the position of the whole seat being at the highest position, the position of the second locking structure corresponds to the position of the whole seat being at the lowest position, and the first locking structure locks the reduction gearbox in the electric screw mechanism on the fixed base in the electric screw mechanism after the whole seat is at the lowest position and the motor stops running; when the whole seat is at the highest position and the motor in the electric screw rod mechanism stops running, the second locking structure locks the reduction gearbox in the electric screw rod mechanism on the fixed base in the electric screw rod mechanism;

a third locking structure and a fourth locking structure are also arranged in the fixed base of the screw rod mechanism, wherein the position of the third locking structure corresponds to the lowest position of the whole seat, the position of the fourth locking structure corresponds to the lowest position of the whole seat, and after the whole seat is at the lowest position and the motor stops running, the third locking structure locks a reduction gearbox in the screw rod mechanism on the fixed base in the screw rod mechanism; when the whole seat is at the highest position and the motor stops running, the fourth locking structure locks the reduction gearbox in the screw rod mechanism on the fixed base in the screw rod mechanism.

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