CN212117606U

CN212117606U - Computer chair with multiple backrest modes

Info

Publication number: CN212117606U
Application number: CN202020389558.4U
Authority: CN
Inventors: 江小平
Original assignee: Guangzhou Woshi Furniture Co ltd
Current assignee: Guangdong Woshi Furniture Co ltd
Priority date: 2020-03-24
Filing date: 2020-03-24
Publication date: 2020-12-11
Anticipated expiration: 2030-03-24

Abstract

The utility model discloses a computer chair with multiple backrest modes, belonging to a chair, wherein the chair back is provided with mounting through holes at the corresponding positions of a waist-leaning plate, and a waist-leaning adjusting part comprises a mandril and a spring; one end of the spring is fixedly arranged in the mounting through hole, the other end of the spring is fixedly connected with the waist support plate, and when the spring is in a normal state, a gap is formed between the waist support plate and the chair back; the push rod penetrates through the mounting through hole and the spring, the push rod can reciprocate in the extending direction of the mounting through hole and the spring, one end of the push rod penetrates through one side, far away from the waist-leaning plate, of the chair back to form a driving end, the other end of the push rod is arranged in the mounting through hole to form a propping end, and the propping end can be close to or far away from the waist-leaning plate under the driving of the driving end so as to prop against and fix the waist-leaning plate or keep away from and release the waist-leaning. Can let the long-term user of computer change different position of sitting under the condition of long-term use computer, can guarantee the lumbar vertebrae quilt bearing location when changing the position of sitting again, reduce the risk of suffering from illness.

Description

Computer chair with multiple backrest modes

Technical Field

The utility model relates to a seat especially relates to a computer chair with multiple back mode.

Background

With the development of science and technology, most office workers realize paperless office work, the paperless office work greatly improves the labor efficiency, but people who use computers frequently have stiff fingers after a long time, even have diseases, and damage the health of people. Has certain ergonomics and is beneficial to health.

However, the existing computer chair only has a seat-leaning mode, namely, a user completely sits on a seat, and the back of the user is completely attached to the backrest of the seat, but under the condition of long-term seat-leaning, the body of the user needs to be changed into a sitting posture so that the body is relaxed and relieved to a certain extent, the traditional computer chair cannot meet the requirement of the user for changing the sitting posture, the user can only obtain seat-leaning experiences with different feelings by changing the position and the angle of the body on the seat, and the mode of changing the sitting posture can easily cause the displacement of the lumbar vertebra and the cervical vertebra for a long time, so that the burden of the lumbar vertebra and the cervical vertebra is increased, and the occupational diseases of most people working with computers are suffered.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a computer chair with multiple backrest modes, which can make the backrest waist plate close to and keep away from the direction of the chair back to reciprocate by setting the backrest waist plate and the backrest waist adjusting piece, thereby providing different backrest modes.

The purpose of the utility model is realized by adopting the following technical scheme:

a computer chair with multiple backrest modes comprises a chair seat and a supporting base arranged at the bottom of the chair seat; a chair back is arranged at one side of the chair seat, a waist-leaning component is arranged at one end of the chair back close to the chair seat, and the waist-leaning component comprises a waist-leaning plate and a waist-leaning adjusting piece arranged between the waist-leaning plate and the chair back; the chair back is provided with a mounting through hole at the corresponding position of the waist-leaning plate, and the waist-leaning adjusting piece comprises a mandril and a spring; one end of the spring is fixedly arranged in the mounting through hole, the other end of the spring is fixedly connected with the waist support plate, and when the spring is in a normal state, a gap is formed between the waist support plate and the chair back; the push rod penetrates through the mounting through hole and the spring, can reciprocate in the extension direction of the mounting through hole and the spring, one end of the push rod penetrates through one side of the chair back far away from the waist-leaning plate to form a driving end, the other end of the push rod is arranged in the mounting through hole to form a propping end, and the propping end can be driven by the driving end to be close to or far away from the waist-leaning plate so as to prop against and fix the waist-leaning plate or be far away from and release the waist-leaning plate; the ejector rod is further provided with a fixing piece, and the fixing piece is provided with a clamping jaw for fixing the ejector rod and the mounting through hole relatively.

Further, the driving end is provided with a push-pull plate.

Furthermore, armrests are respectively arranged on two opposite sides of the chair back, one ends of the armrests are connected with the chair back, the other ends of the armrests extend in the direction far away from the chair back, and the armrests on the two sides, the chair seat and the chair back jointly enclose a seat leaning space; a gap is formed between the chair back and the chair seat.

The waist rest adjusting piece further comprises an air cylinder, the air cylinder is provided with a cylinder body and a piston rod movably arranged in the cylinder body, the cylinder body is fixedly arranged in the mounting through hole, and the piston rod is fixedly connected with the waist rest plate and can drive the waist rest plate to move back and forth to be close to the chair seat or to be far away from the chair seat along the extension direction of the mounting through hole; a sealing partition table is arranged at one end, far away from the waist board, of the piston rod, a first cavity and a second cavity are formed at two opposite ends of the cylinder body, the first cavity is located at one end, far away from the waist board, of the cylinder body, and the second cavity is located at one end, close to the waist board, of the cylinder body; the spring is arranged in the first cavity, and two opposite ends of the spring respectively abut against the cavity wall of the cylinder body and the sealing partition table; the abutting end of the ejector rod penetrates into the first chamber and can move in a reciprocating mode in the direction close to and far away from the sealing partition table.

Furthermore, a rubber connecting piece is arranged between the waist-leaning plate and the piston rod, and the rubber connecting piece is Y-shaped; the extension lengths of two ends of the rubber connecting piece are consistent to form first connecting ends, the two first connecting ends are fixedly connected to the waist leaning plate through bolts, the end, opposite to the two first connecting ends, of the rubber connecting piece forms a second connecting end, and the second connecting end is fixedly connected with the piston rod.

Furthermore, the two first connecting ends are connected to form a U shape, and the second connecting end is arranged on the end part between the two first connecting ends.

Furthermore, one side of the chair back far away from the waist board is provided with a limiting seat, a movable through hole is penetrated through the limiting seat, and a mandril is movably penetrated and connected with the movable through hole; the ejector pin is located the relative both sides of spacing seat and protrudes respectively and is provided with first stopper and second stopper, and the thickness of first stopper adds the diameter of ejector pin and is greater than the diameter of activity through-hole, and the thickness of second stopper adds the diameter of ejector pin and is greater than the diameter of activity through-hole, and the interval of first stopper and second stopper is greater than the width of spacing seat.

Furthermore, the two groups of the waist support components are arranged on the chair back side by side, a lumbar positioning part is formed between the two waist support plates, and the two waist support plates incline towards opposite directions.

Furthermore, a transition back cushion is further arranged on the chair back and arranged on the upper portions of the two waist supporting plates, the cross section of the transition back cushion is triangular, the thickness of one end, close to the waist supporting plate, of the transition back cushion is consistent with that of the waist supporting plate, and the thickness of one end, close to the waist supporting plate, of the transition back cushion is gradually reduced towards the thickness of one end, far away from the waist supporting plate, of the transition back cushion.

Further, the seat support still is provided with the extension plate, and the one end bottom of the back of the chair is kept away from with the seat support to the one end bottom of extension plate is articulated, and the extension plate can be swung to change and accomodate in the seat support bottom, or the extension plate can be swung to change and arrange the seat support in the one end that the back of the chair was kept away from and link up mutually with the seat support.

Compared with the prior art, the beneficial effects of the utility model reside in that:

in the computer chair with multiple backrest modes, one end of the spring is fixedly arranged in the mounting through hole, the other end of the spring is fixedly connected with the waist-leaning plate, when the spring is in a normal state, a gap is formed between the waist-leaning plate and the chair back, a user can lean against the body towards the direction of the chair back and press the waist-leaning plate against the chair back, so that the whole back and the waist can be supported by the chair back and the waist-leaning plate;

the push rod penetrates through the installation through hole and the spring, the push rod can reciprocate in the extension direction of the installation through hole and the spring, one end of the push rod penetrates through one side of the chair back far away from the waist-leaning plate to form a driving end, the other end of the push rod is arranged in the installation through hole to form a propping end, the propping end can be driven by the driving end to be close to or far away from the waist-leaning plate so as to prop against and fix the waist-leaning plate or be far away from and release the waist-leaning plate, the push rod is clamped in the installation through hole through a clamping jaw of the fixing piece by driving the driving end of the push rod, so that the relative distance between the propping end and the waist-leaning plate is adjusted, the area of the chair seat can be changed by different distances between the propping end and the waist-leaning plate when the waist of a user is leaned on the waist-leaning plate, and the size of the seat leaning space favored by different users can be adapted, thereby adjust the seat of a plurality of differences of department and lean on the mode and supply the user to use, can lean on the waist board simultaneously again and can keep the bearing to user's waist when changing the seat and lean on the posture, protect the user, the waist reduces the risk that lumbar vertebrae, cervical vertebra are sick.

Drawings

FIG. 1 is a schematic view of the overall structure of the computer chair with multiple backrest modes according to the present invention;

FIG. 2 is a side view of the computer chair with multiple backrest modes (with the support base removed) of the present invention;

fig. 3 is a schematic structural view of the lumbar support assembly of the present invention.

In the figure: 10. a chair seat; 11. an extension plate; 20. a chair back; 21. a lumbar assembly; 211. a waist support plate; 212. a top rod; 213. a spring; 214. a cylinder; 215. a rubber connector; 2121. a driving end; 2122. abutting against the top end; 2123. a straight rod; 2124. a claw; 2125. a push-pull plate; 2126. a first stopper; 2127. a second limiting block; 2141. a cylinder body; 2142. a piston rod; 2143. a first chamber; 2144. a second chamber; 2145. air holes; 2146. sealing the partition table; 2151. a first connection end; 2152. a second connection end; 22. mounting a through hole; 23. a handrail; 231. a notch; 24. a limiting seat; 241. a movable through hole; 242. a bayonet; 25. a transition headrest; 30. and a base is supported.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.

As shown in fig. 1-3, in order to enable a computer user to change a sitting posture during a long-term use of the computer, and to protect the lumbar vertebra from diseases such as lumbar vertebra, the utility model discloses a computer chair with multiple backrest modes, which comprises a chair seat 10 and a supporting base 30 disposed at the bottom of the chair seat 10, wherein the supporting base 30 can be a five-star base, a universal wheel or a disc base is assembled on the base, and the assembly relationship between the supporting base 30 and the chair seat 10 belongs to the conventional technical means in the field, and therefore, detailed description is omitted.

Specifically, a backrest 20 for a person to lean on is installed on one side of the seat 10, an included angle greater than 90 degrees is formed between the backrest 20 and the seat 10, the included angle extends from one end close to the seat 10 to one end far away from the seat 10, a lumbar component 21 is arranged at one end of the backrest 20 close to the seat 10, the lumbar component 21 is mainly used for supporting the waist of the person to lean on, protecting the lumbar, and reducing the occurrence of lumbar and cervical vertebra diseases, the lumbar component 21 comprises a lumbar plate 211 and a lumbar adjusting piece arranged between the lumbar plate 211 and the backrest 20, the lumbar adjusting piece is used for supporting the lumbar plate 211 and adjusting the distance between the lumbar plate 211 and the backrest 20, the area of the seat 10 can be changed due to the change of the distance between the lumbar plate 211 and the backrest 20, when the lumbar plate 211 is far away from the backrest 20, the upper back of the person to lean on the backrest 20 cannot continuously lean on the backrest 20, so that the sitting posture is changed, the waist leaning plate 211 continuously bears the waist of the sitting and leaning person, so that the sitting posture change is ensured not to increase the burden on the lumbar vertebra and the cervical vertebra, and the occurrence of diseases is avoided;

as a specific embodiment of the lumbar support assembly 21, the seat back 20 is provided with a mounting through hole 22 at a position corresponding to the lumbar support plate 211, and the lumbar support adjusting member includes a push rod 212 and a spring 213; one end of the spring 213 is fixedly arranged in the mounting through hole 22, the other end of the spring 213 is fixedly connected with the lumbar support plate 211, when the spring 213 is in a normal state, a gap is formed between the lumbar support plate 211 and the chair back 20, the push rod 212 is penetrated through the mounting through hole 22 and the spring 213, the push rod 212 can reciprocate in the extending direction of the mounting through hole 22 and the spring 213, one end of the push rod 212 penetrates through one side of the chair back 20 away from the lumbar support plate 211 to form a driving end 2121, the other end of the push rod 212 is arranged in the mounting through hole 22 to form a propping end 2122, the propping end 2122 can be driven by the driving end 2121 to approach or be away from the lumbar support plate 211 so as to prop against and fix the lumbar support plate 211 or release the lumbar support plate 211, when the propping end 2122 of the push rod 212 is far away from the lumbar support plate 211, preferably, the propping end 2122 can be hidden in the lumbar support plate 211, and a sitting person can apply a pressure larger than the elastic, the waist-rest board 211 is attached to the chair back 20, at this time, the waist of the sitting person is continuously pressed by the waist-rest board 211 to be far away from the chair back 20, the chair can support and protect the waist, compared with the common computer chair, the chair has better protection effect that the waist of a user can only lean against the chair back 20, the back of the sitting and leaning person can lean on the chair back 20, so as to achieve the effect that the whole back fits the chair back 20 and the waist leaning plate 211, when the bunt end 2122 extends out of the backrest 20 and butts against the lumbar plate 211, a gap is formed between the lumbar plate 211 and the backrest 20, and when a seated person leans against the backrest, the back of the seated person needs to be far away from the backrest 20, and the seated person only supports the waist by the lumbar plate 211, the gap between the waist support plate 211 and the backrest 20 is increased, so that the area of the seat 10 is reduced, the sitting posture of the sitting and leaning person is changed, the fatigue of the sitting and leaning person can be effectively relieved, and the waist of the sitting and leaning person can be protected.

In order to fix the top rod 212 at any position in the sliding track, the top rod 212 is further provided with a fixing member, the fixing member is provided with a claw 2124 for fixing the top rod 212 and the mounting through hole 22 relatively, in this example, the fixing member is further provided with a straight rod 2123, the straight rod 2123 is in hinged fit with the claw 2124, and a plurality of bayonets 242 capable of being in snap fit with the claw 2124 are arranged on the following limit seat 24 along the traveling track of the top rod 212 to adjust the telescopic position of the top rod 212.

To make the ejector 212 easier to operate, the driving end 2121 of the pull rod is provided with a push-pull plate 2125, increasing the area that the driving end 2121 can hold.

In addition, armrests 23 are respectively arranged on two opposite sides of the chair back 20, one end of each armrest 23 is connected with the chair back 20, the other end of each armrest 23 extends in the direction far away from the chair back 20, and the armrests 23 on the two sides, the chair seat 10 and the chair back 20 jointly enclose to form a seat leaning space; a gap 231 is formed between the chair back 20 and the chair seat 10, and the gap 231 is formed between the chair back 20 and the chair seat 10, so that a sitting space can be provided for the buttocks of a sitting person by the sitting person in the process of leaning on the chair back 20 and the chair backrest plate, and the human engineering is better met.

As a further preferred scheme of the seat back assembly, the lumbar adjustment part further includes an air cylinder 214, the air cylinder 214 has a cylinder body 2141 and a piston rod 2142 movably disposed in the cylinder body 2141, the cylinder body 2141 is fixedly mounted inside the mounting through hole 22, and the piston rod 2142 is fixedly connected to the lumbar plate 211 and can drive the lumbar plate 211 to reciprocate close to the seat 10 or far away from the seat 10 along the extending direction of the mounting through hole 22.

Further, a sealing partition 2146 is disposed at an end of the piston rod 2142 away from the lumbar plate 211, a first cavity 2143 and a second cavity 2144 are formed at opposite ends of the cylinder body 2141 located at the sealing partition 2146, the first cavity 2143 is located at an end of the cylinder body 2141 away from the lumbar plate 211, the second cavity 2144 is located at an end of the cylinder body 2141 close to the lumbar plate 211, and the first cavity 2143 and the second cavity 2144 are both provided with air holes 2145, so that air can be introduced or exhausted when the first cavity 2143 and the second cavity 2144 intake air and exhaust air.

The spring 213 is disposed in the first cavity 2143, and opposite ends of the spring 213 respectively abut against the cavity wall of the cylinder 2141 and the sealing partition 2146; the abutting end 2122 of the ram 212 penetrates the first chamber 2143 and is capable of reciprocating in a direction toward and away from the seal partition 2146.

In order to ensure that the waist support plate 211 can be fit with a user in the process of leaning on, a rubber connecting piece 215 is arranged between the waist support plate 211 and the piston rod 2142, the rubber connecting piece 215 has certain elasticity and elastic resetting capability, in the process of leaning on by a sitting person, after the waist supports the waist support plate 211, the rubber connecting piece 215 can change the angle of the waist support plate 211 due to the pressure exerted by different waist structures, so that the waist support plate 211 can be more fit with the user, and specifically, the rubber connecting piece 215 is in a Y shape.

The two ends of the rubber connecting member 215 extend to the same length to form a first connecting end 2151, the two first connecting ends 2151 are fixedly connected to the waist support plate 211 through bolts, the end of the rubber connecting member 215 opposite to the two first connecting ends 2151 forms a second connecting end 2152, the second connecting end 2152 is fixedly connected with the piston rod 2142, and the two first connecting ends 2151 are adopted to improve the stability of the supporting structure of the waist support plate 211 and also enable the waist support plate 211 to be more stable in the twisting process. The two first connecting ends 2151 are connected in a "U" shape, and the second connecting end 2152 is disposed on an end portion between the two first connecting ends 2151.

In order to prevent the mandril 212 from falling off the chair back 20, one side of the chair back 20, which is far away from the waist-leaning plate 211, is provided with a limiting seat 24, the limiting seat 24 penetrates through the movable through hole 241, and the mandril 212 movably penetrates through the movable through hole 241; the two opposite sides of the top rod 212 on the limiting seat 24 are respectively provided with a first limiting block 2126 and a second limiting block 2127 in a protruding manner, the thickness of the first limiting block 2126 plus the diameter of the top rod 212 is greater than the diameter of the movable through hole 241, the thickness of the second limiting block 2127 plus the diameter of the top rod 212 is greater than the diameter of the movable through hole 241, the distance between the first limiting block 2126 and the second limiting block 2127 is greater than the width of the limiting seat 24, when a seat user operates the top rod 212, the first limiting block 2126 and the second limiting block 2127 respectively limit the length of the top rod 212 extending out of the seat back 20 and the depth of the top rod retracting into the seat back 20, the waist support plate 211 is prevented from excessively far away from the seat back 20, and the top.

In order to further protect the waist of the seat-leaning person, the waist-leaning components 21 are provided with two groups, the two groups of waist-leaning components 21 are arranged on the chair back 20 side by side, a lumbar positioning part is formed between the two waist-leaning plates 211, the two waist-leaning plates 211 incline towards opposite directions, the two waist-leaning plates 211 can be respectively attached to the two sides of the waist of the seat-leaning person in the seat-leaning process of the seat-leaning person, the gap between the two waist-leaning plates forms the lumbar positioning part, the lumbar of the seat-leaning person can be positioned, the lumbar of the seat-leaning person can not be deformed by supporting, and the sitting posture of the seat-leaning person in the seat-.

In order to make the sitting and leaning on more comfortable, the chair back 20 is further provided with a transition back cushion 25, the transition back cushion 25 is arranged at the upper parts of the two waist-leaning plates 211, the cross section of the transition back cushion 25 is triangular, the thickness of one end, close to the waist-leaning plate 211, of the transition back cushion 25 is consistent with that of the waist-leaning plate 211, the thickness of the transition back cushion 25 is gradually reduced from one end, close to the waist-leaning plate 211, to one end, far away from the waist-leaning plate 211, when the sitting and leaning on the waist-leaning on plate 211 and leaning on the back of the chair back 20, the waist-leaning on plate 211 has a certain thickness, therefore, when the waist-leaning on plate 211 can be attached to the chair back 20 by additionally arranging the transition back cushion 25, the transition between the waist and the back of the sitting and leaning on person.

In order to increase different modes of leaning on, the seat support 10 is further provided with an extension plate 11, the bottom of one end of the extension plate 11 is hinged to the bottom of one end of the seat support 10 far away from the chair back 20, the extension plate 11 can be swung and rotated to be accommodated in the bottom of the seat support 10, or the extension plate 11 can be swung and rotated to be arranged at one end of the seat support 10 far away from the chair back 20 and to be connected with the seat support 10, and the area of the seat support 10 is increased.

Through implementing above-mentioned technical scheme, can let the long-term user of computer change different position of sitting under the condition of long-term use computer, can guarantee the lumbar vertebrae again when changing the position of sitting and be supported the location, reduce the risk of suffering from illness.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.

Claims

1. A computer chair with multiple backrest modes comprises a chair seat and a supporting base arranged at the bottom of the chair seat; the method is characterized in that:

a chair back is arranged on one side of the chair seat, a waist leaning component is arranged at one end, close to the chair seat, of the chair back, and the waist leaning component comprises a waist leaning plate and a waist leaning adjusting piece arranged between the waist leaning plate and the chair back;

the chair back is provided with a mounting through hole at a position corresponding to the waist support plate, and the waist support adjusting piece comprises a mandril and a spring; one end of the spring is fixedly arranged in the mounting through hole, the other end of the spring is fixedly connected with the waist-leaning plate, and when the spring is in a normal state, a gap is formed between the waist-leaning plate and the chair back; the push rod penetrates through the installation through hole and the spring, the push rod can reciprocate in the extension direction of the installation through hole and the spring, one end of the push rod penetrates through one side, far away from the waist-leaning plate, of the chair back to form a driving end, the other end of the push rod is arranged in the installation through hole to form a propping end, and the propping end can be driven by the driving end to be close to or far away from the waist-leaning plate so as to prop against and fix the waist-leaning plate or to be far away from and release the waist-leaning plate;

the ejector rod is further provided with a fixing piece, and the fixing piece is provided with a clamping jaw for fixing the ejector rod and the mounting through hole relatively.

2. The computer chair with multiple backrest modes as claimed in claim 1, wherein: the driving end is provided with a push-pull plate.

3. The computer chair with multiple backrest modes as claimed in claim 1, wherein: armrests are respectively arranged on two opposite sides of the chair back, one ends of the armrests are connected with the chair back, the other ends of the armrests extend in the direction far away from the chair back, and the armrests, the chair seat and the chair back on the two sides jointly enclose a seat leaning space; a gap is formed between the chair back and the chair seat.

4. The computer chair with multiple backrest modes as claimed in claim 1, wherein: the waist rest adjusting piece further comprises an air cylinder, the air cylinder is provided with a cylinder body and a piston rod movably arranged in the cylinder body, the cylinder body is fixedly arranged in the installation through hole, and the piston rod is fixedly connected with the waist rest plate and can drive the waist rest plate to move back and forth to be close to the chair seat or to be far away from the chair seat along the extension direction of the installation through hole;

a sealing partition table is arranged at one end, far away from the waist-leaning plate, of the piston rod, the cylinder body is located at two opposite ends of the sealing partition table to form a first cavity and a second cavity, the first cavity is located at one end, far away from the waist-leaning plate, of the cylinder body, and the second cavity is located at one end, close to the waist-leaning plate, of the cylinder body;

the spring is arranged in the first cavity, and two opposite ends of the spring respectively abut against the cavity wall of the cylinder body and the sealing partition table;

the abutting end of the ejector rod penetrates into the first cavity and can move in a reciprocating mode in the direction close to and far away from the sealing partition table.

5. The computer chair with multiple backrest modes as claimed in claim 4, wherein: a rubber connecting piece is arranged between the waist rest plate and the piston rod and is Y-shaped;

the extension lengths of two ends of the rubber connecting piece are consistent to form first connecting ends, the two first connecting ends are fixedly connected to the waist leaning plate through bolts, a second connecting end is formed at one end, opposite to the two first connecting ends, of the rubber connecting piece, and the second connecting end is fixedly connected with the piston rod.

6. The computer chair with multiple backrest modes as claimed in claim 5, wherein: the two first connecting ends are connected to form a U shape, and the second connecting end is arranged on the end part between the two first connecting ends.

7. The computer chair with multiple backrest modes as claimed in any one of claims 1-6, wherein: a limiting seat is arranged on one side, away from the waist leaning plate, of the chair back, a movable through hole is formed in the limiting seat in a penetrating mode, and the ejector rod is movably connected to the movable through hole in a penetrating mode;

the ejector pin is located the both sides that spacing seat is relative are provided with first stopper and second stopper in the protrusion respectively, the thickness of first stopper with the diameter of ejector pin is greater than the diameter of activity through-hole, the thickness of second stopper with the diameter of ejector pin is greater than the diameter of activity through-hole, first stopper with the interval of second stopper is greater than the width of spacing seat.

8. The computer chair with multiple backrest modes as claimed in claim 1, wherein: the backrest assembly is provided with two groups of backrest assemblies which are arranged on the chair back side by side, a lumbar positioning part is formed between the backrest plates, and the backrest plates incline towards opposite directions.

9. The computer chair with multiple backrest modes of claim 8, wherein: still be provided with the transition back cushion on the back of the chair, the transition back cushion sets up two lean on the upper portion of wainscot, the transversal triangle-shaped of personally submitting of transition back cushion, the transition back cushion is close to lean on the one end thickness of wainscot with it is unanimous to lean on wainscot thickness, the transition back cushion is by being close to lean on the one end of wainscot towards keeping away from the one end thickness of wainscot reduces gradually.

10. The computer chair with multiple backrest modes as claimed in claim 1, wherein: the seat support still is provided with the extension plate, the one end bottom of extension plate with the seat support is kept away from the one end bottom of the back of the chair is articulated, the extension plate can swing to change accomodate in the seat support bottom, perhaps the extension plate can swing to change and arrange in the seat support is kept away from the one end of the back of the chair and with the seat support links up mutually.