CN220423525U - Chair with adjustable seat board angle - Google Patents

Abstract

The utility model discloses a seat with an adjustable seat plate angle, which comprises a seat tray, a seat plate mounting seat and a locking mechanism, wherein the seat plate mounting seat is rotationally connected to the seat tray, the seat tray comprises a bottom plate and sealing plates symmetrically arranged on the left side and the right side of the bottom plate, the sealing plates extend upwards, the seat plate mounting seat comprises a mounting plate and folding plates symmetrically arranged on the left side and the right side of the mounting plate, the folding plates extend downwards and correspond to the sealing plates, after the seat plate mounting seat is connected with the seat tray, the folding plates are respectively arranged on the two sides of the sealing plates, the top surfaces of the sealing plates are attached to the bottom surface of the mounting plate, the top surfaces of the sealing plates comprise mutually connected inclined surface sections and plane sections, the inclined surface sections are obliquely arranged from front to back, and when the mounting plate is attached to the plane sections, the seat plate mounting seat is positioned at a horizontal position; when the mounting plate is attached to the bevel section, the seat plate mounting seat is in an inclined position, and the locking mechanism is used for fixing the seat plate mounting seat in a horizontal position or an inclined position. The seat board of the utility model has adjustable angle, and is convenient for a user to relax the legs.

Description

Chair with adjustable seat board angle

Technical Field

The utility model relates to the field of seats, in particular to a seat with an adjustable seat plate angle.

Background

Seats are typically comprised of a seat body and a seat base, wherein the seat body includes a seat pan and a backrest. In the prior art, the seat plate is usually fixedly connected or rotatably connected to the seat base, the seat plate of the seat plate is fixed on the seat base, and the seat plate of the seat plate can only rotate in a horizontal plane; the pitching angles of the seat plates of the two seats cannot be adjusted, and the two seats are kept at the same horizontal plane when in use; there is also a seat back linkage seat in which the seat pan can be moved back and forth, and the height of the seat pan can be changed during the movement, but the angle of the seat pan itself cannot be changed.

In summary, the pitch angle of the seat plate of the current seats in the market cannot be adjusted. However, in practical use of the seat, particularly after sitting on the seat for a long time, the legs and the waist of the person feel tired, and there is a need to extend the legs and support the legs through the ground to relieve fatigue, but the seat plate of the existing seat is generally horizontally arranged, which results in that even if the legs of the user extend towards the ground, the self-gravity is mainly borne by the seat plate, and the fatigue relieving caused by sitting for a long time is limited.

Disclosure of Invention

In order to solve the technical problems, the utility model aims to provide a seat with an adjustable seat board angle, wherein a seat board mounting seat has a horizontal position and an inclined position, the horizontal position is a normal posture of the seat, when the seat board mounting seat is in the inclined position, the seat board mounting seat is inclined from back to front downwards, a user tends to slide to the ground, at the moment, the supporting force of the legs of the user on the body is increased, the effect of relieving the fatigue of the legs can be achieved, and in addition, the position of the seat board is adjustable, more use choices and use experiences are provided for the user.

The technical scheme of the utility model is realized as follows:

the utility model provides a seat with adjustable bedplate angle, the seat includes seat tray, bedplate mount pad and locking mechanical system, the front side of bedplate mount pad rotates to be connected on the seat tray, the seat tray includes the bottom plate, the shrouding of symmetry setting in the bottom plate left and right sides, the shrouding upwards extends, the bedplate mount pad includes the mounting panel, the folded plate of symmetry setting in the mounting panel left and right sides, the folded plate downwardly extending and with the shrouding is corresponding, the bottom plate mount pad with the seat tray links to each other the back, the folded plate is located the both sides of shrouding respectively and the top surface of shrouding is laminated with the bottom surface of mounting panel, the top surface of shrouding includes the inclined plane section and the planar section of mutual linking, the inclined plane section upwards inclines to set up from front to the back, the front end of inclined plane section extends to the front end of shrouding, the rear end of inclined plane section with the front end of planar section links up, the inclined plane section is used for the bedplate mount pad provides the rotation space, bedplate mount pad has horizontal position and incline position, the bottom surface with the planar section laminating when the bottom surface is laminated with planar section, the horizontal position is in the bedplate. When the mounting plate is attached to the inclined surface section, the seat plate mounting seat is in an inclined position, and the locking mechanism is used for fixing the seat plate mounting seat in a horizontal position or an inclined position.

In the scheme, the seat board mounting seat is buckled on the seat tray and can rotate in the up-down direction relative to the seat tray, wherein the top surface of the sealing plate can be attached to the bottom surface of the mounting plate; when the bottom surface of the mounting plate is jointed with the inclined surface section, the angle of the mounting plate is consistent with the inclined surface section, the mounting plate is at an inclined position, and it can be understood that the joint of the inclined surface section and the plane section forms a fulcrum, the mounting plate rotates around the fulcrum, the locking mechanism enables the seat plate mounting seat to be kept at a horizontal position or an inclined position, and the seat plate mounting seat is in a horizontal state and is not different from the existing seat; when the seat board mounting seat is in an inclined state, the body of a user can slide to the ground, the legs of the user need to prop against the ground, and the legs share the gravity of the human body, so that the fatigue of the legs can be effectively relieved.

Preferably, the locking mechanism comprises a locking rod, through holes respectively arranged on the two sealing plates, an avoidance groove arranged on one of the folding plates, and a first locking hole and a second locking hole which are arranged on the other folding plate, wherein the first locking hole is positioned above the second locking hole, the locking rod sequentially penetrates through the avoidance groove and the two through holes and then enters the first locking hole or the second locking hole, and when the locking rod is positioned in the first locking hole, the seat plate is positioned in a horizontal position; when the lock rod is positioned in the second lock hole, the seat plate is positioned at an inclined position. When the seat plate is in a horizontal position, two ends of the lock rod are respectively supported at the top end of the avoidance groove and in the first lock hole; when the seat board is in an inclined position, two ends of the lock rod are positioned below the top end of the avoidance groove and in the second lock hole, and at the moment, the gravity of the seat board mounting seat is borne by the inclined surface section. It can be understood that the effect of dodging the groove is that the seat board mount pad provides the slip space along the upper and lower direction of locking lever, dodges the groove and be the strip and vertical length is not less than first lockhole and second lockhole between vertical interval, dodges the groove and can communicate with the bottom surface of folded plate, also can not communicate.

Preferably, the seat board mounting seat is rotatably connected to the seat tray through a rotating shaft, and the rotating shaft is located at a position of the sealing plate, which is in front of the sealing plate.

Preferably, the perforations are located rearwardly of the closure plate.

Preferably, the front end of the bottom plate is provided with a limiting plate, the limiting plate extends along the left-right direction, the top surface of the limiting plate is a slope surface which is obliquely arranged from front to back, and the slope surface is consistent with the inclination angle of the slope surface section and is connected with the top surface of the notch. When in actual work, when the seat board mounting seat is in an inclined position, the bottom surface of the seat board mounting seat is attached to the top surface of the sealing plate and the top surface of the limiting plate, wherein the top surface of the limiting plate plays a role in further supporting the seat board mounting seat.

Preferably, the seat further comprises an auxiliary limiting mechanism, the auxiliary limiting mechanism comprises limiting grooves symmetrically arranged on the two folded plates and limiting rods symmetrically arranged on the outer sides of the two sealing plates, the limiting grooves are in one-to-one correspondence with the limiting rods, the limiting grooves are obliquely arranged from front to back, and the limiting rods are slidably arranged in the corresponding limiting grooves. When the seat plate mounting seat works actually, the seat plate mounting seat is positioned at the horizontal position when the limiting rod is positioned at the lower end of the limiting groove; when the limiting rod is positioned at the upper end of the limiting groove, the seat plate mounting seat is positioned at an inclined position.

Preferably, the locking mechanism further comprises a fluctuation assembly, the fluctuation assembly comprises a fluctuation block sleeved on the lock rod and a wave bead arranged on the bottom plate, two clamping grooves matched with the wave bead are arranged on the bottom surface of the fluctuation block side by side along the front-back direction, a separation block is arranged between the two clamping grooves, and edges, adjacent to the clamping grooves, of the separation block are subjected to rounding treatment. When the locking rod is actually in operation, the locking rod can slide into/out of the first locking hole and the second locking hole along the left-right direction, and through the arrangement of the fluctuation block and the fluctuation bead, a user judges whether the movement of the locking rod is in place or not through the fluctuation sensation generated when the locking rod moves.

Preferably, the top surface interval of bottom plate is equipped with two cardboard, the fluctuation piece is located between two cardboard and can slide between two cardboard. It can be appreciated that the distance between the two clamping plates is larger than the width of the fluctuation block, and the sliding travel of the fluctuation block is larger than the unlocking travel of the lock rod.

Preferably, the lock rod is rotationally connected to the seat tray and the seat board mounting seat, the seat further comprises a base and an air rod vertically connected to the base, the seat tray is fixedly connected with the telescopic section of the air rod, the telescopic section of the air rod stretches into the seat tray, a control button is arranged on the top surface of the telescopic section, a release arm is arranged on the front end surface of the fluctuation block, and the release arm corresponds to the control button. When the locking device is actually operated, the locking rod is pulled in the left-right direction, so that the locking rod slides into/out of the first locking hole and the second locking hole; when the lock rod is rotated, the lock rod drives the unlocking arm to press the control button of the air rod, so that the extension length of the telescopic section of the air rod is adjusted, namely the height of the seat plate mounting seat is adjusted.

Preferably, the lock rod is provided with a control handle, and the control handle is positioned at one side of the seat board mounting seat. Through setting up control handle, promoted the comfort level of controlling.

The principle and beneficial effects of the utility model adopting the technical scheme are as follows: the seat board mounting seat of the seat has a horizontal position and an inclined position, when the seat board mounting seat is adjusted to an inclined state, in order to prevent the seat from sliding out, the legs of a user need to prop against the ground, and at the moment, the legs share the gravity of a human body, so that the fatigue of the legs can be effectively relieved.

Drawings

FIG. 1 is a schematic view of a seat tray, seat pan mount and locking mechanism;

FIG. 2 is a schematic view of another angle of the seat tray, seat pan mount and locking mechanism;

FIG. 3 is an exploded schematic view of the seat pan, seat pan mount and locking mechanism;

FIG. 4 is a schematic view of a seat tray;

FIG. 5 is an internal schematic view of the seat tray;

FIG. 6 is a cross-sectional view of the seat pan, seat pan mount and locking mechanism;

FIG. 7 is a schematic view of a wave block and a disarming arm;

FIG. 8 is a schematic view of a seat state change;

FIG. 9 is an enlarged schematic view at A of FIG. 8;

fig. 10 is an enlarged schematic view at B of fig. 8.

The reference numerals in the drawings are as follows:

1. a seat; 2. a seat tray; 3. a seat board mounting seat; 4. a bottom plate; 5. a sealing plate; 6. a mounting plate; 7. a folded plate; 8. a bevel section; 9. a planar section; 10. a lock lever; 11. perforating; 12. an avoidance groove; 13. a first lock hole; 14. a second lock hole; 15. a limiting plate; 16. a slope; 17. a limit groove; 18. a limit rod; 19. a wave block; 20. wave beads; 21. a clamping groove; 22. a spacer block; 23. a clamping plate; 24. an air bar; 25. a control button; 26. unlocking the arm; 27. a control handle; 29. a rotating shaft; 30. a bead body; 31. a spring; 32. a base; 33. a cavity.

Description of the embodiments

In order that the above-recited objects, features and advantages of the present utility model will be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, however, the present utility model may be practiced in other ways than those described herein, and therefore the scope of the present utility model is not limited to the specific embodiments disclosed below.

The specific embodiments of the present utility model are as follows:

as shown in fig. 1 to 10, the utility model provides a seat with an adjustable seat board angle, the seat 1 comprises a seat tray 2, a seat board mounting seat 3 and a locking mechanism, the front side of the seat board mounting seat 3 is rotatably connected to the seat tray 2, the seat tray 2 comprises a bottom plate 4 and sealing plates 5 symmetrically arranged at the left side and the right side of the bottom plate 4, the sealing plates 5 extend upwards, the seat board mounting seat 3 comprises a mounting plate 6 and folding plates 7 symmetrically arranged at the left side and the right side of the mounting plate 6, the folding plates 7 extend downwards and correspond to the sealing plates 5, after the bottom plate mounting seat 3 is connected with the seat tray 2, the folding plates 7 are respectively arranged at two sides of the sealing plates 5, the top surface of the sealing plates 5 is attached to the bottom surface of the mounting plate 6, the top surface of the sealing plates 5 comprises a slope section 8 and a plane section 9 which are mutually connected, the slope section 8 is obliquely arranged from front to back to top, the front end of the slope section 8 extends to the front end of the sealing plates 5, the rear end of the slope section 8 is connected to the front end of the plane section 9, the slope section 8 is used for providing a rotating space for the seat board 3, the mounting seat board 3 has a horizontal position and an inclined position, when the bottom surface of the mounting plate 6 is attached to the plane section 3, and the horizontal position is in the horizontal position. When the mounting plate 6 is attached to the inclined surface section 8, the seat plate mounting seat 3 is in an inclined position, the locking mechanism is used for fixing the seat plate mounting seat 3 at a horizontal position or an inclined position, the locking mechanism comprises a locking rod 10, through holes 11 respectively arranged on two sealing plates 5, a avoiding groove 12 arranged on one of the folded plates 7, and a first locking hole 13 and a second locking hole 14 arranged on the other folded plate 7, the first locking hole 13 is positioned above the second locking hole 14, the locking rod 10 sequentially passes through the avoiding groove 12 and the two through holes 11 and then enters the first locking hole 13 or the second locking hole 14, and when the locking rod 10 is positioned in the first locking hole 13, the seat plate is positioned at the horizontal position; when the lock lever 10 is positioned in the second lock hole 14, the seat plate is in an inclined position.

In the scheme, the seat board mounting seat 3 is buckled on the seat tray 2 and can rotate up and down relative to the seat tray 2, wherein the top surface of the sealing plate 5 can be attached to the bottom surface of the mounting plate 6, and as the top surface of the sealing plate 5 is provided with the inclined surface section 8 and the plane section 9, when the bottom surface of the mounting plate 6 is attached to the plane section 9, the angle of the mounting plate 6 is consistent with that of the plane section 9, and the mounting plate 6 is in a horizontal position; when the bottom surface of the mounting plate 6 is attached to the inclined surface section 8, the angle of the mounting plate 6 is consistent with that of the inclined surface section 8, and the mounting plate 6 is in an inclined position at the moment, as can be understood, the joint of the inclined surface section 8 and the plane section 9 forms a fulcrum, the mounting plate 6 rotates around the fulcrum, the locking mechanism enables the seat plate mounting seat 3 to be kept in a horizontal position or an inclined position, and the seat plate mounting seat 3 is in a horizontal state and is not different from the existing seat 1; when the seat board mounting seat 3 is in an inclined state, the body of a user can slide to the ground, the legs of the user need to prop against the ground, and the legs share the gravity of the human body, so that the fatigue of the legs can be effectively relieved; the lock lever 10 is capable of sliding in/out of the first lock hole 13 and the second lock hole 14 in the left-right direction, the first lock hole 13 and the second lock hole 14 being used to lock the lock lever 10.

It can be understood that when the seat board mounting seat 3 is in the horizontal position, the lock rod 10 plays a supporting role on the seat board mounting seat 3, and at this time, two ends of the lock rod 10 are respectively supported at the top end of the avoiding groove 12 and in the first lock hole 13; when the seat plate mounting seat 3 is in the inclined position, two ends of the lock rod 10 are respectively positioned below the top end of the avoidance groove 12 and in the second lock hole 14, and at the moment, the gravity of the seat plate mounting seat 3 is borne by the inclined surface section 8. The effect of dodging the groove 12 is that the sliding space along the upper and lower direction of locking lever 10 is provided for bedplate mount pad 3, dodges the groove 12 and be the strip and vertical length is not less than the vertical interval between first lockhole 13 and the second lockhole 14, dodges the groove 12 and can communicate with the bottom surface of folded plate 7, also can not communicate, in this embodiment, dodges the groove 12 and the bottom surface of folded plate 7 is the intercommunication for the purpose of being convenient for the assembly. When the user needs to switch the seat plate from the horizontal position to the inclined position, the lock rod 10 is pulled out of the first lock hole 13, then the seat plate mounting seat 3 is driven to rotate downwards through the forward tilting body, when the bottom surface of the seat plate mounting seat 3 is attached to the top surface of the sealing plate 5, namely, the seat plate rotates downwards until the seat plate cannot rotate, at the moment, one end of the lock rod 10 slides downwards along the avoidance groove 12, the other end of the lock rod 10 is opposite to the second lock hole 14, the lock rod 10 is driven to extend into the second lock hole 14, so that the seat plate mounting seat 3 is kept in the inclined state, at the moment, the mounting plate is attached to the top surface of the inclined surface section 8, namely, the seat plate mounting seat 3 and the gravity of the user are borne by the inclined surface section 8. In the above process, the user can adjust the seat plate mounting seat 3 without leaving the seat. When the user needs to switch the seat plate from the inclined position to the horizontal position, the above steps are reversed, and the description is omitted here.

As shown in fig. 6, the seat plate mounting base 3 is rotatably connected to the seat tray 2 via a rotation shaft, and the rotation shaft 29 is located at a position forward of the seal plate 5. The perforations 11 are located rearwardly of the closure plate 5. It will be appreciated that a certain distance is provided between the rotating shaft 29 and the through hole 11, so that a larger rotation range of the seat plate can be ensured.

As shown in fig. 5 and 6, the front end of the bottom plate 4 is provided with a limiting plate 15, the limiting plate 15 extends along the left-right direction, the top surface of the limiting plate 15 is a slope surface 16 which is obliquely arranged from front to back and upwards, and the slope surface 16 is consistent with the inclination angle of the slope surface section 8 and is connected with the top surface of the notch. When the seat board mounting seat 3 is in the inclined position in actual operation, the bottom surface of the seat board mounting seat 3 is attached to the top surface of the sealing plate 5 and the top surface of the limiting plate 15, wherein the top surface of the limiting plate 15 plays a role in further supporting the seat board mounting seat 3, as shown in fig. 8-10, the seat 1 further comprises an auxiliary limiting mechanism, the auxiliary limiting mechanism comprises limiting grooves 17 symmetrically arranged on the two folded plates 7 and limiting rods 18 symmetrically arranged on the outer side surfaces of the two sealing plates 5, the limiting grooves 17 are in one-to-one correspondence with the limiting rods 18, the limiting grooves 17 are obliquely arranged from front to back upwards, and the limiting rods 18 are slidably arranged in the corresponding limiting grooves 17. When in actual work, the limiting rod 18 is positioned at the lower end of the limiting groove 17, and the seat plate mounting seat 3 is positioned at the horizontal position; when the limit rod 18 is positioned at the upper end of the limit groove 17, the seat plate mounting seat 3 is positioned at an inclined position. Through setting up supplementary limit structure, further guarantee is to the spacing accuracy of bedplate mount pad 3.

The locking mechanism further comprises a fluctuation component, the fluctuation component comprises a fluctuation block 19 sleeved on the lock rod 10 and a wave bead 20 arranged on the bottom plate 4, two clamping grooves 21 matched with the wave bead 20 are arranged on the bottom surface of the fluctuation block 19 side by side along the front-back direction, a spacing block 22 is arranged between the two clamping grooves 21, and edges of the spacing block 22 adjacent to the clamping grooves 21 are subjected to rounding treatment. In actual operation, the lock lever 10 can slide in/out of the first lock hole 13 and the second lock hole 14 in the left-right direction. By providing the wave block 19 and the wave bead 20, the user judges whether the movement of the lock lever 10 is in place or not by the wave sense generated when the lock lever 10 moves. In this embodiment, two clamping plates 23 are provided at intervals on the top surface of the bottom plate 4, and the wave block 19 is located between the two clamping plates 23 and is capable of sliding between the two clamping plates 23. It will be appreciated that the spacing between the two catch plates 23 is greater than the width of the undulation block 19 and the sliding travel of the undulation block 19 is greater than the unlocking travel of the locking bar 10, the catch plates 23 being adapted to limit the range of motion of the undulation block 19 and prevent the user from pulling the locking bar 10 out of the seat 1.

As shown in fig. 6, the beads 20 include a bead body 30, a spring 31 and a base 32, the base 32 has a cavity 33, a part of the bead body 30 is located in the cavity 33, the spring 31 is disposed in the cavity 33, two ends of the spring 31 respectively support against the bottom surface of the base and the bottom surface of the bead body 30, the bead body 30 exposing the base can retract into the cavity 33 under the action of external force, and the beads 20 can be smoothly switched between two clamping grooves 21 by rounding edges of the spacer 22 adjacent to the clamping grooves 21, so that when the beads 20 enter the clamping grooves 21 at different positions, a vibration-like feeling is generated to remind a user that the beads enter the clamping grooves 21.

The locking lever 10 is connected on seat tray 2 and bedplate mount pad 3 in a rotating way, and seat 1 still includes base and vertical gas pole 24 of connecting on the base, and seat tray 2 and the flexible section fixed connection of gas pole 24 and the flexible section of gas pole 24 stretch into seat tray 2, and the top surface of flexible section is equipped with control button 25, and the front end face of fluctuation piece 19 is equipped with release arm 26, and release arm 26 corresponds with control button 25. In actual operation, the lock lever 10 is pulled in the left-right direction, so that the lock lever 10 slides into/out of the first lock hole 13 and the second lock hole 14; when the lock rod 10 is rotated, the lock rod 10 drives the unlocking arm 26 to press the control button 25 of the air rod 24, so that the extension length of the telescopic section of the air rod 24 is adjusted, namely the height of the seat plate mounting seat 3 is adjusted. In the present embodiment, the lock lever 10 is provided with a control knob 27, and the control knob 27 is located on one side of the seat plate mounting base 3. By providing the control handle 27, the comfort of handling is improved.

The utility model and its embodiments have been described above by way of illustration and not limitation, and the utility model is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present utility model.

Claims (10)

1. The seat with the adjustable seat board angle is characterized by comprising a seat tray, a seat board mounting seat and a locking mechanism, wherein the front side of the seat board mounting seat is rotationally connected to the seat tray, the seat tray comprises a bottom plate and sealing plates symmetrically arranged on the left side and the right side of the bottom plate, the sealing plates extend upwards, the seat board mounting seat comprises a mounting plate and folding plates symmetrically arranged on the left side and the right side of the mounting plate, the folding plates extend downwards and correspond to the sealing plates,

after the bottom plate mounting seat is connected with the seat tray, the folded plates are respectively positioned at two sides of the sealing plate, the top surface of the sealing plate is attached to the bottom surface of the mounting plate, the top surface of the sealing plate comprises an inclined surface section and a plane section which are mutually attached, the inclined surface section is obliquely arranged from front to back, the front end of the inclined surface section extends to the front end surface of the sealing plate, the rear end of the inclined surface section is attached to the front end of the plane section, the inclined surface section is used for providing a rotating space for the seat plate mounting seat, the seat plate mounting seat is provided with a horizontal position and an inclined position, and when the bottom surface of the mounting plate is attached to the plane section, the seat plate mounting seat is positioned at the horizontal position; when the mounting plate is attached to the inclined surface section, the seat plate mounting seat is in an inclined position, and the locking mechanism is used for fixing the seat plate mounting seat in a horizontal position or an inclined position.

2. The seat with the adjustable seat plate angle according to claim 1, wherein the locking mechanism comprises a lock rod, through holes respectively arranged on two sealing plates, an avoidance groove arranged on one of the folding plates, and a first lock hole and a second lock hole arranged on the other folding plate, the first lock hole is positioned above the second lock hole, the lock rod sequentially passes through the avoidance groove and the two through holes and then enters the first lock hole or the second lock hole, and when the lock rod is positioned in the first lock hole, the seat plate is positioned in a horizontal position; when the lock rod is positioned in the second lock hole, the seat plate is positioned at an inclined position.

3. An adjustable seat pan angle seat as claimed in claim 1 wherein the seat pan mounting is pivotally connected to the seat pan by a pivot located forwardly of the closure plate.

4. An adjustable seat pan angle seat as claimed in claim 2, wherein the aperture is located rearwardly of the cover plate.

5. The seat with the adjustable seat pan angle according to claim 1, wherein the front end of the bottom plate is provided with a limiting plate, the limiting plate extends along the left-right direction, the top surface of the limiting plate is a slope surface which is obliquely arranged from front to back, and the slope surface is consistent with the inclination angle of the slope surface section and is connected with the top surface of the notch.

6. The seat with the adjustable seat board angle according to claim 1, further comprising an auxiliary limiting mechanism, wherein the auxiliary limiting mechanism comprises limiting grooves symmetrically arranged on the two folded plates and limiting rods symmetrically arranged on the outer sides of the two sealing plates, the limiting grooves are in one-to-one correspondence with the limiting rods, the limiting grooves are obliquely arranged from front to back, and the limiting rods are slidably arranged in the corresponding limiting grooves.

7. The seat with the adjustable seat board angle according to claim 2, wherein the locking mechanism further comprises a fluctuation assembly, the fluctuation assembly comprises a fluctuation block sleeved on the lock rod and a wave bead arranged on the bottom plate, two clamping grooves matched with the wave bead are arranged on the bottom surface of the fluctuation block side by side along the front-back direction, a spacer block is arranged between the two clamping grooves, and edges of the spacer block adjacent to the clamping grooves are rounded.

8. An adjustable seat pan angle seat as claimed in claim 7 wherein the top surface of the floor is provided with two clips at intervals, the wave block being located between and slidable between the two clips.

9. The seat with the adjustable seat pan angle according to claim 7, wherein the lock rod is rotatably connected to the seat tray and the seat pan mounting seat, the seat further comprises a base and an air rod vertically connected to the base, the seat tray is fixedly connected with a telescopic section of the air rod, the telescopic section of the air rod stretches into the seat tray, a control button is arranged on the top surface of the telescopic section, a release arm is arranged on the front end surface of the fluctuation block, and the release arm corresponds to the control button.

10. The seat with the adjustable seat pan angle according to claim 9, wherein the lock lever is provided with a control handle, and the control handle is located at one side of the seat pan mounting seat.