CN111990807A

CN111990807A - Aluminum ergonomic chair support structure and rapid assembly method thereof

Info

Publication number: CN111990807A
Application number: CN202010901968.7A
Authority: CN
Inventors: 程红; 卞金欢; 张平; 夏必胜; 陈锴; 王耀宇; 汤瑞
Original assignee: Zhangjiagang Runsheng Science & Technology Material Co ltd
Current assignee: Zhangjiagang Runsheng Science & Technology Material Co ltd
Priority date: 2020-09-01
Filing date: 2020-09-01
Publication date: 2020-11-27

Abstract

The invention discloses an aluminum ergonomic chair support structure and a quick assembly method thereof, and relates to the technical field of chairs. The supporting mechanism comprises a bottom plate, the shape of the bottom plate is circular, an arc-shaped convex plate is fixedly arranged above the bottom plate, universal wheels are fixedly arranged below the bottom plate, a central plate is embedded in the middle of the upper portion of the arc-shaped convex plate, the shape of the central plate is square, a first bearing is arranged above the central plate, and a supporting column is arranged above the first bearing. According to the invention, through the combined use of the second annular groove, the second bearing and the reinforcing rod, the supporting column can be supported under the condition that the rotation of the supporting column is not influenced, so that the supporting column is prevented from being inclined to cause seat damage, and the second annular groove, the second bearing and the reinforcing rod can support the supporting column to enable the supporting column to bear larger force.

Description

Aluminum ergonomic chair support structure and rapid assembly method thereof

Technical Field

The invention belongs to the technical field of seats, and particularly relates to an aluminum ergonomic seat support structure and a quick assembly method thereof.

Background

The office chair refers to various chairs which are equipped for working conveniently in daily work and social activities. Office chairs are classified into a narrow office chair and a generalized office chair, wherein the narrow office chair refers to a backrest chair on which a person sits when working on a desktop in a sitting posture, and the generalized office chair is all chairs used in offices and comprises a executive chair, a middle office chair, a guest-meeting chair, a staff chair, a conference chair, a visitor chair, a training chair and an ergonomic chair. The ergonomic chair is elegant in design, unique, fashionable and light, and is a novel environment-friendly healthy chair which is generally applied to modern families, entertainment, internet bars, hotels, leisure, conference rooms, office computer desks and the like. The design principle is released naturally, is adjusted in a humanized way and is suitable for adjustment of various body types; the material is mainly made of environment-friendly materials.

The ergonomic chair mainly adopts elastic environment-friendly materials such as mesh cloth, environment-friendly cloth and high-quality memory cotton to manufacture the cushion and the chair back, and is very suitable for the development of new trend of furniture in the future in process design. Has good ventilation and heat dissipation characteristics, is comfortable and healthy, and can prevent the chair from generating a bacterial growth environment in the use process. And can reduce the oppression area of the hip and the back, press the acupuncture points at the stressed positions, promote the blood circulation of the hip and the back, avoid the strain of the neck, the shoulder and the waist and keep the health of people.

At present, the support column of the ergonomic chair in the market is poor in support performance, and when a large force acts on the support column, the support column is easy to damage, so that the support column of the existing ergonomic chair needs to be supported, and the support column is prevented from being damaged.

Disclosure of Invention

The invention aims to provide an aluminum ergonomic chair support structure and a quick assembly method thereof, which solve the problem of poor support effect of the existing aluminum ergonomic chair by combining and using a second annular groove, a second bearing and a reinforcing rod.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the invention relates to an aluminum ergonomic chair supporting structure which comprises a supporting mechanism, wherein a top mechanism is inserted above the supporting mechanism, and the supporting mechanism and the top mechanism are fixed through a connecting component;

the supporting mechanism comprises a bottom plate, the bottom plate is circular, an arc-shaped convex plate is fixedly mounted above the bottom plate, universal wheels are fixedly mounted below the bottom plate, a central plate is embedded in the middle of the upper portion of the arc-shaped convex plate, the central plate is square, a first bearing is arranged above the central plate, a supporting column is arranged above the first bearing, a first annular groove is formed in the bottom end of the supporting column, an inner ring of the first bearing is located inside the first annular groove and fixedly connected with the first annular groove, the lower surface of an outer ring of the first bearing is fixedly connected with the upper surface of the central plate, a rectangular slot is formed in the top end surface of the supporting column, a first spring is placed inside the rectangular slot, and two jacks are formed in the top end of the supporting column;

the top mechanism comprises a top plate, a rectangular inserted link is fixedly arranged on the lower surface of the top plate, the rectangular inserting rod is vertical to the lower surface of the top plate, a plurality of positioning holes are arranged on the rectangular inserting rod, the bottom end of the rectangular inserting rod is inserted in the rectangular inserting groove, and the bottom end surface of the rectangular inserted rod is contacted with the top end of the first spring, the connecting component comprises a bolt, the bolt passes through the jack and the positioning hole and is fixed by a nut, the top mechanism also comprises a seat plate, the seat plate is positioned right above the top plate, the top plate is connected with the seat plate through four buffer parts, the back of the upper surface of the seat plate is rotatably connected with a backrest, the seat plate is connected with the backrest through an electric telescopic rod, the bottom end of the electric telescopic rod is rotatably connected with the rear surface of the seat plate through a hinged support, and the top end of the electric telescopic rod is rotatably connected with the back surface of the backrest through a hinged support.

Preferably, the number of the universal wheels is four, and the four universal wheels are arranged in a square shape.

Preferably, the week side of support column just is located and has seted up a second ring channel between first ring channel and the jack, the outside cover of support column has a second bearing, the inner ring of second bearing be located the inside of second ring channel and with second ring channel fixed connection, fixed mounting has a plurality of stiffeners on the outer loop of second bearing, the one end fixed mounting that the second bearing was kept away from to the stiffener is on the arc flange.

Preferably, the number of the reinforcing rods is four, and the four reinforcing rods are distributed annularly.

Preferably, the bolster includes a sleeve, telescopic bottom fixed mounting has a first connecting plate, telescopic top is run through and is had a slip post, the one end fixed mounting of slip post has an interior plectane, interior plectane be located telescopic inside and with sleeve sliding fit, the one end fixed mounting that interior plectane was kept away from to the slip post has a second connecting plate, the week side of slip post just is located and has cup jointed a second spring between sleeve and the second connecting plate, first connecting plate passes through the free bearing with the upper surface of roof and rotates and be connected, the second connecting plate also rotates through the free bearing with the lower surface of seat and is connected.

Preferably, still be equipped with two sets of direction subassemblies between roof and the seat, the direction subassembly includes a guide post, the top face of guide post and the lower fixed surface of seat are connected, the roof is passed to the bottom of guide post, and fixed mounting has a baffle on the bottom face of guide post, the week side of guide post just is located and has cup jointed a third spring between roof and the seat.

Preferably, two through holes matched with the guide posts are formed in the top plate, the inner diameters of the through holes are the same as the diameters of the guide posts, and the inner walls of the through holes and the peripheral side faces of the guide posts are smooth.

Preferably, the baffle is circular in shape, the diameter of the baffle is larger than that of the guide post, and the difference is 2-4 cm.

Preferably, the equal fixed mounting in both sides of seat has a handrail, the shape of handrail is "U" shape, the last fixed surface of seat installs a cushion, the cushion is the component of rubber material, the top fixed mounting of back has a connecting block, the top fixed mounting of connecting block has a back cushion.

Preferably, the method for assembling the aluminum ergonomic seat support structure comprises the following steps:

SS 001: firstly, a worker screws a universal wheel with a threaded column on the bottom end of a bottom plate with a threaded groove;

SS 002: after the universal wheel is assembled, the worker aligns the rectangular insertion rod at the bottom end of the top mechanism with the rectangular insertion slot, then inserts the rectangular insertion rod at the bottom end of the top mechanism into the rectangular insertion slot, the bottom end face of the rectangular insertion rod is in contact with the top end of the first spring, and then the whole height of the top mechanism is adjusted to enable the top mechanism to be at a proper height;

and (4) SS 003: at the moment, a worker presses the top mechanism downwards to enable the top mechanism to be pressed to a proper position, the first spring is in a compressed state, then the bolt penetrates through the jack and the positioning hole, and finally the nut is screwed on the bolt;

SS 004: after the overall height of the top mechanism is adjusted, a worker starts a control switch of the electric telescopic rod, and the electric telescopic rod drives the backrest to rotate, so that the inclination angle of the backrest is adjusted, and the backrest is at a proper inclination angle.

Compared with the prior art, the aluminum ergonomic chair support structure and the quick assembly method thereof provided by the invention have the following beneficial effects:

1. according to the aluminum ergonomic chair, the four universal wheels distributed in the annular shape are arranged below the bottom plate, so that the flexibility of the aluminum ergonomic chair is greatly improved, when the aluminum ergonomic chair needs to be shifted, the aluminum ergonomic chair only needs to be pushed, manual carrying is not needed, the labor capacity is greatly reduced, and the aluminum ergonomic chair is easy to push to the market.

2. The first bearing, the support column and the first annular groove are combined for use, so that the support column can rotate on the central plate, a worker sitting on the top mechanism can freely rotate in the horizontal direction, and the comfort level of the aluminum ergonomic chair is greatly improved.

3. According to the invention, by arranging the first spring, when the height of the top mechanism needs to be adjusted, a worker only needs to control the force for pressing the top mechanism to enable the top mechanism to be pressed to a proper position, then the bolt penetrates through the jack and the positioning hole, and finally the nut is screwed on the bolt.

4. According to the invention, through the combined use of the second annular groove, the second bearing and the reinforcing rod, the supporting column can be supported under the condition that the rotation of the supporting column is not influenced, so that the supporting column is prevented from being inclined to cause seat damage, and the second annular groove, the second bearing and the reinforcing rod can support the supporting column to enable the supporting column to bear larger force.

5. According to the invention, through the combined use of the support columns, the rectangular slots, the jacks, the rectangular insertion rods, the positioning holes and the connecting assembly, the whole height of the top mechanism can be manually adjusted, so that the top mechanism is suitable for people with different heights, the application range of the invention is greatly improved, the height adjusting mode is simple, and the cost is lower.

6. The buffer piece is arranged, so that a worker sitting on the seat board can feel more comfortable, when an object impacts the top mechanism, the buffer piece can buffer the impact force, and the worker sitting on the seat board cannot be greatly impacted, so that the comfort of the invention is greatly improved.

7. According to the invention, through the combined use of the seat plate, the backrest and the electric telescopic rod, the inclination of the backrest can be adjusted, so that a worker sitting on the seat plate is more comfortable.

Drawings

FIG. 1 is a schematic view of an ergonomic aluminum seat support structure;

FIG. 2 is a side view of the present invention;

FIG. 3 is an exploded view of the present invention;

FIG. 4 is a cross-sectional view of the support mechanism of the present invention;

FIG. 5 is a schematic view of the overall construction of the top mechanism of the present invention;

FIG. 6 is a side view of the top mechanism of the present invention;

fig. 7 is a cross-sectional view of the cushioning member of the present invention.

Reference numbers in the figures: 1. a support mechanism; 101. a base plate; 102. an arc-shaped convex plate; 103. a universal wheel; 104. a center plate; 105. a first bearing; 106. a support pillar; 107. a first annular groove; 108. a rectangular slot; 109. a first spring; 110. a jack; 111. a second annular groove; 112. a second bearing; 113. a reinforcing bar; 2. a top mechanism; 201. a top plate; 202. a rectangular insertion rod; 203. positioning holes; 204. a seat plate; 205. a buffer member; 2051. a sleeve; 2052. a first connecting plate; 2053. a sliding post; 2054. an inner circular plate; 2055. a second connecting plate; 2056. a second spring; 206. a guide post; 207. a baffle plate; 208. a third spring; 209. a backrest; 210. an electric telescopic rod; 211. a handrail; 212. a cushion; 213. connecting blocks; 214. a back cushion; 3. a connecting assembly; 301. a bolt; 302. and (4) a nut.

Detailed Description

The invention is further described with reference to the following figures and embodiments.

Please refer to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, and fig. 7 in combination, wherein fig. 1 is a schematic structural view of an aluminum ergonomic chair support structure; FIG. 2 is a side view of the present invention; FIG. 3 is an exploded view of the present invention; FIG. 4 is a cross-sectional view of the support mechanism of the present invention; FIG. 5 is a schematic view of the overall construction of the top mechanism of the present invention; FIG. 6 is a side view of the top mechanism of the present invention; fig. 7 is a cross-sectional view of the cushioning member of the present invention. The invention relates to an aluminum ergonomic chair supporting structure which comprises a supporting mechanism 1, wherein a top mechanism 2 is inserted above the supporting mechanism 1, and the supporting mechanism 1 and the top mechanism 2 are fixed through a connecting component 3;

the supporting mechanism 1 comprises a bottom plate 101, the shape of the bottom plate 101 is circular, an arc-shaped convex plate 102 is fixedly arranged above the bottom plate 101, universal wheels 103 are fixedly arranged below the bottom plate 101, a central plate 104 is embedded in the middle of the upper part of the arc-shaped convex plate 102, the central plate 104 is square, a first bearing 105 is arranged above the central plate 104, a supporting column 106 is arranged above the first bearing 105, a first annular groove 107 is arranged at the bottom end of the supporting column 106, the inner ring of the first bearing 105 is located inside the first annular groove 107 and is fixedly connected with the first annular groove 107, the lower surface of the outer ring of the first bearing 105 is fixedly connected with the upper surface of the central plate 104, a rectangular slot 108 is formed in the top end surface of the supporting column 106, a first spring 109 is placed inside the rectangular slot 108, and two jacks 110 are formed in the top end of the supporting column 106;

the top mechanism 2 comprises a top plate 201, a rectangular insertion rod 202 is fixedly installed on the lower surface of the top plate 201, the rectangular insertion rod 202 is perpendicular to the lower surface of the top plate 201, a plurality of positioning holes 203 are formed in the rectangular insertion rod 202, the bottom end of the rectangular insertion rod 202 is inserted into the rectangular insertion groove 108, the bottom end face of the rectangular insertion rod 202 is in contact with the top end of the first spring 109, the connecting assembly 3 comprises a bolt 301, the bolt 301 penetrates through the insertion hole 110 and the positioning holes 203 and is fixed through a nut 302, the top mechanism 2 further comprises a seat plate 204, the seat plate 204 is located right above the top plate 201, the top plate 201 is connected with the seat plate 204 through four buffering members 205, the back side of the upper surface of the seat plate 204 is rotatably connected with a backrest 209, the seat plate 204 is connected with the backrest 209 through an electric telescopic rod 210, the bottom end of the electric telescopic rod 210 is rotatably connected with the back surface of the seat plate 204 through a hinge seat, the top end of the electric telescopic rod 210 is also rotatably connected with the back surface of the backrest 209 through a hinged support.

Further, the number of the universal wheels 103 is four, and the four universal wheels 103 are arranged in a square shape.

Further, a second ring groove 111 has been seted up to the week side of support column 106 and be located between first ring groove 107 and the jack 110, the outside cover of support column 106 has a second bearing 112, the inner ring of second bearing 112 be located the inside of second ring groove 111 and with second ring groove 111 fixed connection, fixed mounting has a plurality of stiffeners 113 on the outer loop of second bearing 112, the one end fixed mounting that stiffener 113 kept away from second bearing 112 is on arc flange 102.

Further, the number of the reinforcing rods 113 is four, and four reinforcing rods 113 are annularly distributed.

Further, the buffer member 205 includes a sleeve 2051, a first connecting plate 2052 is fixedly mounted at the bottom end of the sleeve 2051, a sliding column 2053 penetrates through the top end of the sleeve 2051, an inner circular plate 2054 is fixedly mounted at one end of the sliding column 2053, the inner circular plate 2054 is located inside the sleeve 2051 and is in sliding fit with the sleeve 2051, a second connecting plate 2055 is fixedly mounted at one end, far away from the inner circular plate 2054, of the sliding column 2053, a second spring 2056 is sleeved on the peripheral side surface of the sliding column 2053 and located between the sleeve 2051 and the second connecting plate 2055, the first connecting plate 2052 is rotatably connected with the upper surface of the top plate 201 through a hinge base, and the second connecting plate 2055 is also rotatably connected with the lower surface of the seat plate 204 through a hinge base.

Further, two sets of guide assemblies are further arranged between the top plate 201 and the seat plate 204, each guide assembly comprises a guide column 206, the top end surface of each guide column 206 is fixedly connected with the lower surface of the seat plate 204, the bottom end of each guide column 206 penetrates through the top plate 201, a baffle 207 is fixedly installed on the bottom end surface of each guide column 206, and a third spring 208 is sleeved between the top plate 201 and the seat plate 204 and located on the peripheral side surface of each guide column 206.

Furthermore, two through holes matched with the guide posts 206 are formed in the top plate 201, the inner diameters of the through holes are the same as the diameters of the guide posts 206, and the inner walls of the through holes and the peripheral side faces of the guide posts 206 are smooth.

Further, the baffle 207 is circular, the diameter of the baffle 207 is larger than that of the guide post 206, and the difference is 2-4 cm.

Further, the both sides of seat 204 all fixed mounting have an handrail 211, the shape of handrail 211 is "U" shape, the last fixed surface of seat 204 installs a cushion 212, cushion 212 is the component of rubber material, the top fixed mounting of back 209 has a connecting block 213, the top fixed mounting of connecting block 213 has a back cushion 214.

Further, an assembling method of the aluminum ergonomic chair support structure comprises the following steps:

SS 001: firstly, a worker screws a universal wheel 103 with a threaded column on the bottom end of a bottom plate 101 with a threaded groove;

SS 002: after the universal wheel 103 is assembled, at this time, the worker aligns the rectangular insertion rod 202 at the bottom end of the top mechanism 2 with the rectangular insertion slot 108, then inserts the rectangular insertion rod 202 at the bottom end of the top mechanism 2 into the rectangular insertion slot 108, at this time, the bottom end surface of the rectangular insertion rod 202 will contact with the top end of the first spring 109, and then adjusts the overall height of the top mechanism 2, so that the top mechanism 2 is at a proper height;

and (4) SS 003: at the moment, the worker presses the top mechanism 2 downwards to enable the top mechanism 2 to be pressed to a proper position, the first spring 109 is in a compressed state, then the bolt 301 penetrates through the jack 110 and the positioning hole 203, and finally the nut 302 is screwed on the bolt 301;

SS 004: after the overall height of the top mechanism 2 is adjusted, the worker starts the control switch of the electric telescopic rod 210, and the electric telescopic rod 210 drives the backrest 209 to rotate, so that the inclination angle of the backrest 209 is adjusted, and the backrest 209 is at a proper inclination angle.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. An aluminium system ergonomic seat bearing structure which characterized in that: including supporting mechanism (1), it has a top mechanism (2) to peg graft in the top of supporting mechanism (1), supporting mechanism (1) and top mechanism (2) are fixed through coupling assembling (3), supporting mechanism (1) includes a bottom plate (101), the shape of bottom plate (101) is circular, the top fixed mounting of bottom plate (101) has an arc flange (102), the below fixed mounting of bottom plate (101) has universal wheel (103), a well board (104) has been inlayed in the top middle part of arc flange (102), the shape of well board (104) is the square, the top of well board (104) is equipped with a first bearing (105), the top of first bearing (105) is equipped with a support column (106), a first ring channel (107) has been seted up to the bottom of support column (106), the inner ring of first bearing (105) is located the inside of first ring channel (107) and is fixed even with first ring channel (107) The lower surface of the outer ring of the first bearing (105) is fixedly connected with the upper surface of the central plate (104), the top end surface of the supporting column (106) is provided with a rectangular slot (108), a first spring (109) is placed in the rectangular slot (108), the top end of the supporting column (106) is provided with two jacks (110), the top mechanism (2) comprises a top plate (201), the lower surface of the top plate (201) is fixedly provided with a rectangular inserted rod (202), the rectangular inserted rod (202) is perpendicular to the lower surface of the top plate (201), the rectangular inserted rod (202) is provided with a plurality of positioning holes (203), the bottom end of the rectangular inserted rod (202) is inserted in the rectangular slot (108), the bottom end surface of the rectangular inserted rod (202) is contacted with the top end of the first spring (109), the connecting assembly (3) comprises a bolt (301), bolt (301) pass jack (110) and locating hole (203) and fix through nut (302), top mechanism (2) still include a seat (204), seat (204) are located roof (201) directly over, roof (201) and seat (204) are connected through four bolster (205), the upper surface rear side rotation of seat (204) is connected with a back (209), connect through electric telescopic handle (210) between seat (204) and back (209), the bottom of electric telescopic handle (210) and the rear surface of seat (204) are passed through the free bearing and are rotated and be connected, the top of electric telescopic handle (210) also rotates through the free bearing with the back of back (209) and is connected.

2. The aluminum ergonomic seat support structure of claim 1 wherein said universal wheels (103) are four in number, four of said universal wheels (103) being in a square arrangement.

3. The aluminum ergonomic chair support structure of claim 1, wherein a second annular groove (111) is formed on the circumferential side of the support column (106) and located between the first annular groove (107) and the insertion hole (110), a second bearing (112) is sleeved on the outer side of the support column (106), an inner ring of the second bearing (112) is located inside the second annular groove (111) and fixedly connected with the second annular groove (111), a plurality of reinforcing rods (113) are fixedly mounted on the outer ring of the second bearing (112), and one end, away from the second bearing (112), of each reinforcing rod (113) is fixedly mounted on the arc-shaped convex plate (102).

4. The aluminum ergonomic seat support structure of claim 3, wherein said reinforcement bars (113) are four in number, and four reinforcement bars (113) are distributed in a ring shape.

5. The aluminum ergonomic seat support structure of claim 1 wherein, the buffer piece (205) comprises a sleeve (2051), a first connecting plate (2052) is fixedly arranged at the bottom end of the sleeve (2051), a sliding column (2053) penetrates through the top end of the sleeve (2051), an inner circular plate (2054) is fixedly arranged at one end of the sliding column (2053), the inner circular plate (2054) is positioned inside the sleeve (2051) and is in sliding fit with the sleeve (2051), a second connecting plate (2055) is fixedly arranged at one end of the sliding column (2053) far away from the inner circular plate (2054), a second spring (2056) is sleeved on the peripheral side surface of the sliding column (2053) and positioned between the sleeve (2051) and the second connecting plate (2055), the first connecting plate (2052) is rotatably connected with the upper surface of the top plate (201) through a hinged support, the second connecting plate (2055) is also rotatably connected with the lower surface of the seat plate (204) through a hinged support.

6. The aluminum ergonomic chair support structure of claim 1, wherein two sets of guiding components are further disposed between the top plate (201) and the seat plate (204), the guiding components comprise a guiding column (206), a top end surface of the guiding column (206) is fixedly connected with a lower surface of the seat plate (204), a bottom end of the guiding column (206) penetrates through the top plate (201), a baffle plate (207) is fixedly mounted on a bottom end surface of the guiding column (206), and a third spring (208) is sleeved on a peripheral side surface of the guiding column (206) and located between the top plate (201) and the seat plate (204).

7. The aluminum ergonomic chair support structure of claim 6, wherein the top plate (201) is provided with two through holes matching with the guide posts (206), the inner diameter of the through holes is the same as the diameter of the guide posts (206), and the inner wall of the through holes and the peripheral side surface of the guide posts (206) are smooth.

8. The aluminum ergonomic seat support structure of claim 1, wherein said baffle (207) is circular in shape, said baffle (207) having a diameter greater than the diameter of the guide post (206) by a difference of between 2-4 cm.

9. The aluminum ergonomic chair support structure of claim 1, wherein an armrest (211) is fixedly mounted on each side of the seat plate (204), the armrest (211) is U-shaped, a cushion (212) is fixedly mounted on the upper surface of the seat plate (204), the cushion (212) is a rubber member, a connecting block (213) is fixedly mounted on the top end of the backrest (209), and a headrest (214) is fixedly mounted on the top end of the connecting block (213).

10. A method of assembling an ergonomic aluminum seat support structure as in any of claims 1 to 9, comprising the steps of:

SS 001: firstly, a worker screws a universal wheel (103) with a threaded column on the bottom end of a bottom plate (101) with a threaded groove;

SS 002: after the universal wheel (103) is assembled, the worker aligns the rectangular insertion rod (202) at the bottom end of the top mechanism (2) with the rectangular insertion slot (108), then inserts the rectangular insertion rod (202) at the bottom end of the top mechanism (2) into the rectangular insertion slot (108), the bottom end face of the rectangular insertion rod (202) is in contact with the top end of the first spring (109), and then the whole height of the top mechanism (2) is adjusted to enable the top mechanism (2) to be at a proper height;

and (4) SS 003: at the moment, a worker presses the top mechanism (2) downwards to enable the top mechanism (2) to be pressed to a proper position, the first spring (109) is in a compressed state, then the bolt (301) penetrates through the insertion hole (110) and the positioning hole (203), and finally the nut (302) is screwed on the bolt (301).

SS 004: after the overall height of the top mechanism (2) is adjusted, a worker starts a control switch of the electric telescopic rod (210), and the electric telescopic rod (210) drives the backrest (209) to rotate, so that the inclination angle of the backrest (209) is adjusted, and the backrest (209) is at a proper inclination angle.