Side support chair back and seat

Abstract

The utility model provides a side supporting chair back and a seat. The side supporting chair back comprises a back supporting piece and side supporting pieces symmetrically arranged on the left side and the right side of the back supporting piece. The side supporting pieces forwards exceed the front side of the back supporting piece; the side supporting pieces are connected with matching parts; the matching parts can move on the back supporting piece in the left-right direction, a driving mechanism is arranged between the matching parts of the two side supporting pieces, the driving mechanism controls the matching parts to be away from each other or close to each other and then stay at the corresponding positions, the distance between the two side supporting pieces is adjusted in place, and therefore the two sides of the upper body of a user are effectively supported. The whole adjusting mode does not need to depend on manual adjustment, and the convenience of position adjustment of the side supporting piece and the use experience feeling of the seat are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of seat, especially a side support chair back and seat. BACKGROUND

[0002] The existing seat on the market includes the seat used by adult, such as office chair, and the seat used by children, such as study seat, wherein many seats set up side support on the seat to correct the sitting posture of the user to avoid the health problem such as scoliosis of the user.

[0003] The existing part of seat sets up the side support of adjustable position to support the two sides of the upper body of the person of different body shape, for example, the patent of seat with the announcement number CN219613431, the clamping arm of adjustable transversely is set up on the backrest of seat, the fixed part of clamping arm is equipped with two fixed holes of transversely spaced, the backrest is equipped with the adjusting hole of corresponding position, the adjusting hole can be screw hole, the clamping arm can be matched with the different fixed hole and adjusting hole through screw to adjust the distance between two clamping arms, so that the seat can be suitable for the person of different body shape or the child under different development state to sit, but when the adjusting mode needs to manually disassemble screw, it is inconvenient to adjust in actual use. SUMMARY

[0004] In order to solve the above technical problem, the utility model aims at providing a side support chair back and seat, drive mechanism is arranged between the cooperation part of two side supports, the distance between two side supports is adjusted to the right position by the drive mechanism controlling the cooperation part to stay in the corresponding position after moving away from each other or approaching each other, effective support is formed to the two sides of the upper body of the user, the whole adjusting mode does not need to rely on manual adjustment, and the convenience of position adjustment of side support is improved.

[0005] The technical scheme of the utility model is realized as follows:

[0006] A side support chair back, comprising a back support and two side supports symmetrically arranged on the left and right sides of the back support, the side support extends forward beyond the front side of the back support, a cooperation part is connected to the side support, the cooperation part is movable along the left and right directions on the back support, a drive mechanism is arranged between the two cooperation parts, the drive mechanism comprises a drive assembly and a drive motor, the drive assembly comprises a rack connected to the cooperation part and extending inwardly to the side support, the two racks are staggered left and right, and the tooth parts of the two racks are engaged with a linkage gear, and the output end of the drive motor is in transmission connection with the linkage gear.

[0007] The drive motor drives the linkage gear to rotate, so that the two cooperation parts approach or move away from each other and then stay in the corresponding position, so as to adjust the distance between the two side supports to the right position.

[0008] Preferably, the linkage gear is connected with a rotating shaft at at least one end, the output end of the driving motor is provided with an output shaft, and the output shaft is connected with the rotating shaft through a key or a shaft coupling.

[0009] Preferably, the back support is provided with a through-going empty area in front of and behind the driving motor, so as to reduce the space occupied by the driving motor on the back support.

[0010] Preferably, the back support is provided with a strip-shaped slot extending in the left-right direction, and the rack and the linkage gear are located in the strip-shaped slot, so that the linkage gear and the rack are concealed in the strip-shaped slot, and the chair back is simple and beautiful.

[0011] Preferably, each matching part is connected with a sliding part matching the width of the strip-shaped slot, and the sliding part is slidingly connected in the strip-shaped slot, so that the matching part can move in the left-right direction on the back support; the sliding cooperation between the sliding part and the strip-shaped slot can provide the matching part with a moving guide.

[0012] Preferably, the back support is connected with a back plate covering the front surface of the back support at the front end, and the back plate abuts against the front end of the sliding part to limit the sliding part from coming out of the strip-shaped slot; the back plate can avoid the connection part of the matching part and the driving mechanism from being exposed, and at the same time, the back plate can limit the sliding part, which is a clever design and achieves two purposes at once.

[0013] Preferably, the back plate is provided with an avoiding slot for avoiding the left-right movement of the matching part, and the width of the avoiding slot is smaller than the width of the sliding part; the avoiding slot can avoid the interference between the matching part and the back plate during the movement of the matching part, and the small width of the avoiding slot can also ensure that the sliding part will not come out of the avoiding slot.

[0014] Preferably, at least one of the left side support and the right side support is provided with a control mechanism between the back support, the control mechanism comprises a control pull rod connected with the side support, and the back support is provided with a plurality of gear holes arranged in the left-right direction and used for cooperating with the control pull rod; when the control pull rod comes out of the corresponding gear hole, the corresponding side support can move left and right and adjust the size of the support area; when the control pull rod is inserted into the corresponding gear hole, the corresponding side support can stay at the corresponding position after adjustment; thus, the process of locking and unlocking the position of the side support is simplified to a simple pulling process of the control pull rod, and the position adjustment and locking of the side support are simple and efficient.

[0015] A side-supported chair back includes a back support member and side support members symmetrically arranged on the left and right sides of the back support member; the side support members extend forward beyond the front side of the back support member; the side support members are connected to mating parts; the mating parts can move on the back support members in the left and right direction, and a drive mechanism is provided between the two mating parts; the drive mechanism includes a drive assembly and two gas springs, the drive assembly includes a sliding member mounted on the mating part and slidably connected to the back support member in the left and right direction, the gas springs have piston rods that can extend and retract in the left and right direction, and the two piston rods are respectively connected to the two mating parts;

[0016] The two piston rods extend or retract, causing the two mating parts to move closer or further apart and then stop at the corresponding positions, thereby adjusting the distance between the two side supports into place.

[0017] Preferably, each gas spring is connected to a cable control assembly, which includes a control switch and a cable acting on the piston rod. After the two piston rods extend or retract into place, the control switch can tighten the cable to stop the piston rods in the corresponding positions.

[0018] Preferably, the front end of the back support is connected to a back plate that covers the front surface of the back support. The back plate abuts against the front end of the slider to prevent the slider from moving forward out of the slot. The back plate can prevent the connection between the mating part and the drive mechanism from being exposed, while also limiting the slider. The design is ingenious and achieves two goals at once.

[0019] Preferably, the back plate is provided with a clearance groove for avoiding the left and right movement of the mating part. The width of the clearance groove is smaller than the width of the slider. The clearance groove can prevent the mating part from interfering with the back plate when it moves. At the same time, the smaller width of the clearance groove also ensures that the slider will not come out of the clearance groove.

[0020] Preferably, at least one of the left and right side supports is provided with a control mechanism between itself and the back support. The control mechanism includes a control rod connected to the side support. The back support has multiple stop holes spaced apart in the left-right direction for engaging with the control rod. When the control rod disengages from the corresponding stop hole, the corresponding side support can move left or right and adjust the size of the support area. When the control rod is inserted into the corresponding stop hole, the corresponding side support can remain in the adjusted position. This simplifies the locking and unlocking process of the side support to a simple pulling process of the control rod, making the adjustment and locking of the side support simple and efficient.

[0021] Preferably, the back support member is provided with a strip groove extending in the left-right direction, and the sliding member is slidably connected in the strip groove; providing a guide for the left-right movable mating parts.

[0022] A side support chair back comprises a back support and side supports symmetrically arranged on the left and right sides of the back support; the side supports extend forward beyond the front side of the back support; the side supports are connected with matching parts; the matching parts are movable on the back support in the left-right direction, and a driving mechanism is arranged between the two matching parts; the driving mechanism comprises a driving assembly and a motor assembly, the motor assembly has two opposite output ends, the driving assembly comprises a screw rod and nut structure, the screw rod and nut structure comprises a first nut and a second nut respectively mounted on the two matching parts, the first nut and the second nut are respectively screw-connected with a first screw rod and a second screw rod, the threads of the first screw rod and the second screw rod are opposite in rotation direction, and the two output ends are respectively in transmission connection with the first screw rod and the second screw rod; the first nut and the second nut are slidable on the back support in the left-right direction.

[0023] The motor assembly drives the first screw rod and the second screw rod to rotate in the same direction, so that the two matching parts are close to or away from each other and then stop at corresponding positions, so as to adjust the distance between the two side supports to the right position.

[0024] As a preferred, the front end of the back support is connected with a back plate covering the front surface of the back support, and the back plate abuts against the front end of the sliding member in the rear direction to limit the sliding member from being pulled out of the strip-shaped slot in the front direction.

[0025] As a preferred, the back plate is provided with an avoiding slot for avoiding the left-right movement of the matching parts, and the width of the avoiding slot is smaller than the width of the sliding member.

[0026] As a preferred, at least one of the left side support and the right side support is provided with a control mechanism with the back support, the control mechanism comprises a control pull rod connected with the side support, and the back support is provided with a plurality of gear holes arranged in the left-right direction and used for cooperating with the control pull rod, when the control pull rod is pulled out of the corresponding gear hole, the corresponding side support can move left and right and adjust the size of the support area; when the control pull rod is inserted into the corresponding gear hole, the corresponding side support can stay at the corresponding position after adjustment. Thus, the process of locking and unlocking the position of the side support is simplified to the simple pulling process of the control pull rod, so that the position adjustment and locking of the side support are simple and efficient.

[0027] As a preferred, the back support is provided with a strip-shaped slot extending in the left-right direction, and the first nut and the second nut are slidably connected in the strip-shaped slot; the strip-shaped slot can provide sliding guidance for the first nut and the second nut, so that the first nut and the second nut do not rotate in the same direction when the first screw rod and the second screw rod rotate, and the stability of the two side supports during adjustment is ensured.

[0028] As a preferred, the motor assembly is a double-output motor with two output ends; or, the motor assembly is two single-output motors, and the output ends of the two single-output motors are respectively in transmission connection with the first screw rod and the second screw rod.

[0029] A seat comprising the side support chair back.

[0030] The side support chair back has the beneficial effects that:

[0031] The side support chair back can drive the left and right side support members through the driving mechanism, and the driving mechanism can provide adjustment power for the left and right movement of the two side support members. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a structural diagram of the side support chair back.

[0033] Figure 2 It is an enlarged view of the control pull rod and the driving mechanism.

[0034] Figure 3 It is an exploded view of the side support chair back.

[0035] Figure 4 It is a schematic view of the gear hole on the back support member.

[0036] Figure 5 It is a schematic view of the connection between the two cooperating parts and the driving mechanism in embodiment 2.

[0037] Figure 6 It is a schematic view of the connection between the two cooperating parts and the driving mechanism in embodiment 3.

[0038] Figure 7 It is a schematic view of the connection between the two cooperating parts and the driving mechanism in embodiment 3.

[0039] The reference signs are as follows: 1-back support member, 2-side support member, 3-linkage gear, 4-control pull rod, 5-back plate, 6-driving motor, 7-pull wire, 71-control switch, 8-air spring, 9-double output motor, 9a-single output motor, 9b-single motor seat, 11-sliding groove, 12-rotating shaft hole, 13-gear hole, 14-motor seat, 15-clearance area, 21-sliding member, 22-soft pad, 23-cooperating part, 24-rack, 25-first nut, 26-second nut, 31-rotating shaft, 41-side extension, 51-avoidance slot, 91-first screw, 92-second screw, 93-mounting seat, 94-stand, 211-guide slot, 911-driving shaft, 912-single output shaft. DETAILED DESCRIPTION

[0040] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0041] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0042] This utility model has multiple embodiments, and the specific implementation methods are as follows:

[0043] Example 1: As Figures 1-4 As shown, this embodiment provides a side-supported chair back, including a back support 1 and side support members 2 symmetrically arranged on the left and right sides of the back support 1. The side support member 2 is a plate-like structure, with its front end protruding forward and forming a parabolic arc to mimic the curve of the human spine. The side support member 2 extends forward beyond the front side of the back support 1. A mating part 23 is connected to the side support member 2. The mating part 23 can move in the left and right direction on the back support member, and a driving mechanism is provided between the two mating parts 23. The driving mechanism includes a driving assembly and a driving motor 6. The driving assembly includes a rack 24 connected to the mating part 23 and extending into the side support member 2. The two racks 24 are staggered left and right, and the teeth of the two racks 24 simultaneously mesh with a linkage gear 3. The output end of the driving motor 6 is connected to the linkage gear 3. The output end of the driving motor 6 can be directly connected to the linkage gear 3, or it can be indirectly connected to the linkage gear 3 through a transmission component such as a bevel gear.

[0044] When it is necessary to adjust the distance between the two side support members 2 to accommodate the body shape of the occupant, the drive motor 6 drives the linkage gear 3 to rotate, so that the two mating parts 23 move closer or further apart and stop at the corresponding position, thereby adjusting the distance between the two side support members 2 to the correct position. The entire adjustment process is simple and efficient, and does not require the occupant to be adjusted, thus improving the seating experience.

[0045] Further, at least one end of the linkage gear 3 is connected with a rotating shaft 31, the back supporting member 1 is provided with a rotating shaft hole 12 matched with the rotating shaft 31, the back supporting member 1 is connected with a motor base 14 through screws, and the motor base 14 is connected with the driving motor 6; the output end of the driving motor 6 is provided with an output shaft, which can be directly connected with the linkage gear 3 in transmission, or can drive the linkage gear 3 to rotate through a transmission member such as a bevel gear or a spur gear; in the embodiment, the direct connection mode is explained and described, that is, the output shaft is connected with the rotating shaft 31 through a key or a shaft coupling; specifically, for example, a spline can be arranged on the output shaft, and a spline groove is arranged on the rotating shaft 31, so that the spline is matched with the spline groove; or the output shaft and the rotating shaft 31 can be concentric, and a shaft coupling is arranged between the output shaft and the rotating shaft 31 and is locked through screws, so as to achieve the purpose of transmission connection.

[0046] Further, since the thickness of the driving motor 6 is large, the driving motor 6 occupies a large space on the back supporting member 1, so that the back supporting member 1 looks relatively bulky in appearance; in order to avoid this phenomenon, the back supporting member 1 is provided with a front-to-rear through emptying area 15, and the driving motor 6 is located in the emptying area 15; so as to reduce the space occupied by the driving motor 6 on the back supporting member 1.

[0047] Further, the back supporting member 1 is provided with a strip-shaped groove 11 extending along the left-right direction; the strip-shaped groove 11 can optimize the layout of the chair back, and can also provide a guide for the left-right movement of the matching part 23; specifically, the rack 24 and the linkage gear 3 are located in the strip-shaped groove 11; the linkage gear 3 and the rack 24 are hidden in the strip-shaped groove 11, so as to ensure the simple and beautiful appearance of the chair back; in addition, each matching part 23 is correspondingly connected with a sliding member 21 matched with the width of the strip-shaped groove 11, and the sliding member 21 is slidingly connected in the strip-shaped groove 11, so that the matching part 23 can move along the left-right direction on the back supporting member 1, thereby providing a movement guide for the matching part 23.

[0048] Further, the part of the driving mechanism connected with the matching part 23 is exposed on the back supporting member 1, which affects the appearance of the chair back; therefore, the back plate 5 covering the front surface of the back supporting member 1 is connected with the front end of the back supporting member 1, the back plate 5 abuts against the front end of the sliding member 21 in the rear direction, so as to limit the sliding member 21 from coming out of the strip-shaped groove 11 in the front direction; the back plate 5 can avoid the exposure of the part of the driving mechanism connected with the matching part 23, and also plays a limiting role for the sliding member 21, which is a clever design and achieves two purposes at one time.

[0049] Further, while the back plate 5 covers the front side of the back supporting member 1, it is also considered that the left-right moving matching part 23 will not interfere with the back plate 5; therefore, the back plate 5 is provided with an avoiding groove 51 for avoiding the left-right movement of the matching part 23, and the width of the avoiding groove 51 is smaller than the width of the sliding member 21; the avoiding groove 51 can avoid the interference between the matching part 23 and the back plate 5 during the movement of the matching part 23, and the smaller width of the avoiding groove 51 also ensures that the sliding member 21 will not come out of the avoiding groove 51.

[0050] Further, to ensure that the side support 2 can stop at the corresponding position after moving left and right, at least one of the left side support 2 and the right side support 2 is provided with a control mechanism between the back support 1, and in this embodiment, to ensure that the two side supports 2 have sufficient locking force, two control mechanisms are provided, and the two control mechanisms control the movement or locking of the side support 2 respectively. Specifically, the control mechanism includes a control pull rod 4 connected to the side support 2, and the back support 1 is provided with a plurality of gear holes 13 arranged along the left and right directions and used for cooperating with the control pull rod 4. When the control pull rod 4 is out of the corresponding gear hole 13, the corresponding side support 2 can move left and right and adjust the size of the support area. When the control pull rod 4 is inserted into the corresponding gear hole 13, the corresponding side support 2 can stay at the corresponding position after adjustment. Thus, the process of locking and unlocking the position of the side support 2 is simplified to the simple pulling process of the control pull rod, making the position adjustment and locking of the side support 2 simple and efficient.

[0051] Further, the control pull rod 4 is connected to the side support 2 through a sliding piece 21. Specifically, the sliding piece 21 is provided with a front and rear through guide groove 211, and the control pull rod 4 is inserted into the guide groove 211 to move forward and backward and be inserted into or out of the corresponding gear hole 13.

[0052] Further, although the control pull rod 4 is inserted into the guide groove 211 and cooperates with the gear hole 13 to be separated, this insertion type design is easy to make the control pull rod 4 out of the guide groove 211 when the control pull rod 4 is pulled out of the gear hole 13 by external force, so that the control pull rod 4 is separated from the side support 2. Therefore, to avoid this phenomenon, the control pull rod 4 has a side extension 41 extending to the inside of the control pull rod 4 at the position close to the back support 1 on the rod, and the side extension 41 is opposite to the side support 2. When the control pull rod 4 is out of the corresponding gear hole 13, the side extension 41 abuts against the side support 2, so that the control pull rod 4 and the side support 2 form a hooking and limiting position. Thus, the control pull rod 4 is prevented from falling off the side support 2 when it is out of the gear hole 13.

[0053] Further, the soft pad 22 is connected to the support surface of the side support 2. The soft pad 22 can provide soft support touch for the ribs and improve the sitting experience.

[0054] Further, to make the size of the support area within a reasonable range, the width between the two side supports 2 changes in the range of 220mm-390mm. This range can effectively support the positions of the ribs at both ends of the upper body of children or adults with different body shapes after sitting.

[0055] Furthermore, a seat (not shown) is provided, including the aforementioned side-supported backrest; when the user sits on the seat, the cooperating part 23 can be moved left and right by the drive mechanism to adjust the size of the support area suitable for the user, so that the side support members 2 on both sides are always close to the upper body of the user, so as to correct the sitting posture.

[0056] Example 2: As Figure 5 As shown, this embodiment differs from the above embodiment in that it provides another side-supported chair back, including a back support member 1 and side support members 2 symmetrically arranged on the left and right sides of the back support member 1; the side support members 2 extend forward beyond the front side of the back support member 1; a mating part 23 is connected to the side support member 2; the mating part 23 can move in the left and right direction on the back support member, and a driving mechanism is provided between the two mating parts 23; the structure of the driving mechanism is different from that of the above embodiment. Specifically, the driving mechanism includes a driving assembly and two gas springs 8. The driving assembly includes a sliding member 21 mounted on the mating part 23 and slidably connected to the back support member 1 in the left and right direction. The gas spring 8 has a piston rod that can extend and retract in the left and right direction, and the two piston rods are respectively connected to the two mating parts 23; wherein, the two gas springs 8 can be mounted on the outside of the mating part 23 as shown in the figure of this embodiment, or, for the sake of saving layout space, the two gas springs 8 can be mounted on the inside of the two mating parts 23;

[0057] The two piston rods extend or retract, causing the two mating parts 23 to move closer or further apart and then stop at the corresponding positions, so as to adjust the distance between the two side support members 2 into place.

[0058] Furthermore, to control the piston rods of the gas springs 8 to stop or extend in the corresponding positions, each gas spring 8 is connected to a cable control assembly. The cable control assembly includes a control switch 71 and a cable 7 acting on the piston rod. The control switch 71 is usually located outside the seat for easy operation by the occupant. The control switch 71 can be a manual wrench or an electric button that controls the tightening of the cable 7. This type of technology is common in seats, and its specific principle and structure will not be elaborated here. In short, when the two piston rods extend or retract into their positions, the control switch 71 can tighten the cable 7, causing the piston rods to stop in the corresponding positions.

[0059] Example 3: As Figures 6-7As shown, the embodiment differs from the above-described embodiment in that the embodiment provides another side support chair back, which comprises a back support 1 and side supports 2 symmetrically arranged on the left and right sides of the back support 1; the side supports 2 forwardly exceed the front side of the back support 1; the side supports 2 are connected with matching parts 23; the matching parts 23 are movable on the back support in the left-right direction, and a driving mechanism is arranged between the two matching parts 23; the structure of the driving mechanism is different from that of the above-described embodiment, and specifically, the driving mechanism comprises a driving assembly and a motor assembly, the motor assembly has two opposite output ends, the driving assembly comprises a screw nut and screw rod structure, the screw nut and screw rod structure comprises a first nut 25 and a second nut 26 respectively mounted on the two matching parts 23, the first nut 25 and the second nut 26 are respectively screw-connected with a first screw 91 and a second screw 92, the threads of the first screw 91 and the second screw 92 are opposite in rotation direction, and the two output ends are respectively in transmission connection with the first screw 91 and the second screw 92; the first nut 25 and the second nut 26 are slidable on the back support 1 in the left-right direction.

[0060] The motor assembly drives the first screw 91 and the second screw 92 to rotate in the same direction, so that the two matching parts 23 are close to or away from each other and then stop at corresponding positions, so as to adjust the distance between the two side supports 2 to the right position.

[0061] Further, the back support 1 is provided with a strip-shaped groove 11 extending in the left-right direction, and the first nut 25 and the second nut 26 are slidably connected in the strip-shaped groove 11; the strip-shaped groove 11 can provide sliding guidance for the first nut 25 and the second nut 26, so that the first nut 25 and the second nut 26 can slide in the left-right direction when the first screw 91 and the second screw 92 rotate, and the stability of the adjustment of the two side supports 2 is ensured.

[0062] Further, the motor assembly in the embodiment has two structures, and specifically, the motor assembly is a double-output motor 9, which has the two output ends; or the motor assembly is two single-output motors, and the output ends of the two single-output motors 9a are respectively in transmission connection with the first screw 91 and the second screw 92; the two structures can all drive the first screw 91 and the second screw 92 to rotate in the same direction, so that the two side supports 2 are close to or away from each other in the left-right direction.

[0063] The above description of the utility model and its implementation modes is illustrative, and the description is not restrictive, and the embodiment shown in the drawings is only one of the embodiments of the utility model, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired thereby, without departing from the creative purpose of the utility model, similar structural modes and embodiments can be designed without creativity, which should all belong to the protection scope of the utility model.

Claims

1. A side support chair back, characterized by, The back support (1) and the side support (2) arranged symmetrically on the left and right sides of the back support (1); the side support (2) exceeds the front side of the back support (1); the side support (2) is connected with the matching part (23); the matching part (23) can move left and right on the back support, and the drive mechanism is arranged between the two matching parts (23); the drive mechanism includes a drive assembly and a drive motor (6), the drive assembly includes a rack (24) connected to the matching part (23) and extending inwardly to the side support (2), the two racks (24) are staggered left and right, and the tooth parts of the two racks (24) simultaneously mesh with the linkage gear (3); the output end of the drive motor (6) is in transmission connection with the linkage gear (3); The drive motor (6) drives the linkage gear (3) to rotate, so that the two matching parts (23) are close to or away from each other and then stop at the corresponding positions, so as to adjust the distance between the two side supports (2) to the position.

2. A side support chair back as claimed in claim 1, characterised in that: At least one end of the linkage gear (3) is connected with a rotating shaft (31), and the output end of the drive motor (6) is provided with an output shaft which is connected with the rotating shaft (31) through a key or a shaft coupling.

3. A side support chair back as claimed in claim 1, characterised in that: The back support (1) is provided with an empty area (15) extending through the front and back, and the drive motor (6) is located in the empty area (15).

4. A side support chair back as claimed in claim 1, wherein: The back support (1) is provided with a strip-shaped slot (11) extending in the left and right directions, and the rack (24) and the linkage gear (3) are located in the strip-shaped slot (11).

5. A side support chair back according to claim 4, wherein: Each matching part (23) is correspondingly connected with a sliding piece (21) matched with the width of the strip-shaped slot (11), and the sliding piece (21) is slidingly connected in the strip-shaped slot (11), so that the matching part (23) can move left and right on the back support (1).

6. A side support chair back according to claim 5, wherein: The back plate (5) is connected to the front end of the back support (1) and covers the front surface of the back support (1), and the back plate (5) abuts against the front end of the sliding piece (21) to limit the sliding piece (21) from coming out of the strip-shaped slot (11).

7. A side support chair back according to claim 6, wherein: The back plate (5) is provided with an avoiding slot (51) for avoiding the left and right movement of the matching part (23), and the width of the avoiding slot (51) is smaller than the width of the sliding piece (21).

8. A side support chair back as claimed in claim 1, characterised in that: At least one of the left side support (2) and the right side support (2) is provided with a control mechanism between the back support (1), and the control mechanism includes a control pull rod (4) connected with the side support (2), and a plurality of gear holes (13) arranged in the left and right directions on the back support (1) and matched with the control pull rod (4); when the control pull rod (4) is out of the corresponding gear hole (13), the corresponding side support (2) can move left and right and adjust the size of the supporting area; when the control pull rod (4) is inserted into the corresponding gear hole (13), the corresponding side support (2) can stay at the corresponding position after adjustment.

9. A side support chair back, characterized by The back supporting part (1) and the side supporting parts (2) arranged symmetrically on the left and right sides of the back supporting part (1); the side supporting parts (2) exceed the front side of the back supporting part (1) forward; the side supporting parts (2) are connected with the matching parts (23); the matching parts (23) can move along the left and right directions on the back supporting part, and the driving mechanism is arranged between the two matching parts (23); the driving mechanism comprises the driving assembly, two gas springs (8), the driving assembly comprises the sliding part (21) installed on the matching part (23) and slidingly connected on the back supporting part (1) along the left and right directions, and the gas spring (8) has the piston rod which can extend and retract along the left and right directions, and the two piston rods are connected with the two matching parts (23) respectively; The two piston rods extend or retract, the two matching parts (23) are close to or away from each other, and then stop at the corresponding positions, so that the distance between the two side supporting parts (2) is adjusted to the position.

10. A side support chair back according to claim 9, wherein: The pull wire control assembly is connected on each gas spring (8), the pull wire control assembly comprises the control switch (71) and the pull wire (7) acting on the piston rod, after the two piston rods extend or retract to the position, the control switch (71) can tighten the pull wire (7), so that the piston rod stops at the corresponding position.

11. A side support chair back according to claim 9, wherein: The back plate (5) covering the front surface of the back supporting part (1) is connected to the front end of the back supporting part (1), the back plate (5) abuts against the front end of the sliding part (21) rearward, so as to limit the sliding part (21) from coming out of the strip-shaped groove (11) forward.

12. A side support chair back according to claim 11, characterised in that: The avoiding groove (51) is arranged on the back plate (5) for avoiding the left and right movement of the matching part (23), and the width of the avoiding groove (51) is smaller than the width of the sliding part (21).

13. A side support chair back according to claim 9, wherein: At least one of the left side supporting part (2) and the right side supporting part (2) is provided with the control mechanism between the back supporting part (1), the control mechanism comprises the control pull rod (4) connected with the side supporting part (2), the back supporting part (1) is provided with the multiple gear holes (13) arranged along the left and right directions and used for cooperating with the control pull rod (4), when the control pull rod (4) comes out of the corresponding gear hole (13), the corresponding side supporting part (2) can move left and right and adjust the size of the supporting area; when the control pull rod (4) is inserted into the corresponding gear hole (13), the corresponding side supporting part (2) can stay at the corresponding position after adjustment.

14. A side support chair back according to claim 9, wherein: The back supporting part (1) is provided with the strip-shaped groove (11) extending along the left and right directions, and the sliding part (21) is slidingly connected in the strip-shaped groove (11).

15. A side support chair back, characterized by The back support (1) and the side support (2) arranged symmetrically on the left and right sides of the back support (1); the side support (2) exceeds the front side of the back support (1); the side support (2) is connected with the matching part (23); the matching part (23) can move along the left and right directions on the back support, and the drive mechanism is arranged between the two matching parts (23); the drive mechanism includes a drive assembly and a motor assembly, and the motor assembly has two opposite output ends; the drive assembly includes a screw nut structure, the screw nut structure includes a first nut (25) and a second nut (26) mounted on the two matching parts (23) respectively, the first nut (25) and the second nut (26) are respectively screwed with a first screw (91) and a second screw (92), the threads of the first screw (91) and the second screw (92) are opposite in rotation direction, and the two output ends are respectively in transmission connection with the first screw (91) and the second screw (92); the first nut (25) and the second nut (26) can slide left and right on the back support (1); The motor assembly drives the first screw (91) and the second screw (92) to rotate in the same direction, so that the two matching parts (23) are close to or away from each other and then stop at the corresponding positions, so as to adjust the distance between the two side supports (2) to the position.

16. A side support chair back according to claim 15, wherein: The back support (1) is connected with the back plate (5) covering the front surface of the back support (1), and the back plate (5) abuts against the front end of the sliding piece (21) to limit the sliding piece (21) from being pulled out of the strip-shaped groove (11).

17. A side support chair back according to claim 16, wherein: The back plate (5) is provided with an avoiding groove (51) for avoiding the left and right movement of the matching part (23), and the width of the avoiding groove (51) is smaller than the width of the sliding piece (21).

18. A side support chair back according to claim 15, wherein: At least one of the left side support (2) and the right side support (2) is provided with a control mechanism between the back support (1), and the control mechanism includes a control pull rod (4) connected with the side support (2), and a plurality of gear holes (13) arranged at intervals along the left and right directions on the back support (1) and used for cooperating with the control pull rod (4); when the control pull rod (4) is pulled out of the corresponding gear hole (13), the corresponding side support (2) can move left and right and adjust the size of the supporting area; when the control pull rod (4) is inserted into the corresponding gear hole (13), the corresponding side support (2) can stay at the corresponding position after adjustment.

19. A side support chair back according to claim 15, wherein: The back support (1) is provided with a strip-shaped groove (11) extending along the left and right directions, and the first nut (25) and the second nut (26) are slidably connected in the strip-shaped groove (11).

20. A side support chair back according to claim 15, wherein: The motor assembly is a double-output motor (9) having two opposite output ends; or, the motor assembly is two single-output motors (9a), and the output ends of the two single-output motors (9a) are respectively in transmission connection with the first screw (91) and the second screw (92).

21. A seat, characterized by: The side support chair back of any one of claims 1, 9, 15.

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