A chair back assembly and a seat

Abstract

The utility model provides a kind of chair back assembly and seat, including back support piece and the side support piece of symmetrical arrangement in the left and right sides of back support piece, strip slot is opened on back support piece along transverse extension, installation portion is connected on side support piece, by the installation portion on side support piece is inserted into the strip slot on back support piece, and make strip slot to the part of installation portion inserted into strip slot form movement guide, while adjusting the width between the side support piece outside two strip slots to place, simplify the structure of seat, make the appearance of seat simple and easy, improve the use experience of seat simultaneously.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of seat, especially a chair back assembly 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 are provided with side support members on the seat for correcting the sitting posture of the user, and the support space of the two side support members on the seat is usually adjusted to make the two side support members close to the two sides of the waist of the sitter, so as to avoid the health problems such as lateral curvature of the spine of the sitter with different body types.

[0003] For example, in the office chair patent with the announcement number CN110664153, two independent waist supports are arranged on the fixed rod, the waist supports are connected with the horizontal rod through the rotary connecting piece, the waist supports can rotate on the horizontal rod through the rotary connecting piece, the hinge two is arranged in the slide of the fixed rod and can slide, and the connecting rod is used to sequentially connect the waist support, the hinge two and the adjusting member; the seat can be opened or closed accordingly when the waist support is subjected to the backward leaning force, the opening size of the waist support is adjusted to adapt to the waist of different users; however, the structure is relatively complex, and the plurality of components such as the horizontal rod and the connecting rod are exposed on the seat, which not only complicates the structure of the seat, but also affects the appearance of the seat.

[0004] For example, in the seat patent with the announcement number CN111685526, the inner side of the seat is provided with a reinforcing mechanism, the reinforcing mechanism includes a reinforcing backrest, a second fixed groove is arranged on one side surface of the reinforcing backrest, a bearing is fixedly connected to the inner side of the second fixed groove, a threaded rod is rotatably connected to the inner side of the bearing, and a handle is fixedly connected to one end surface of the threaded rod; the handle on both sides of the backrest is manually rotated to fix the position of the waist by the reinforcing backrest; in the seat, the threaded rod for adjusting is also exposed on the seat, so that the appearance of the seat is not beautiful enough, and the sitting experience of the seat is affected. SUMMARY

[0005] In order to solve the above technical problems, the utility model aims at providing a chair back assembly and seat, the installation part on the side support member is inserted into the strip-shaped groove on the back support member, and the strip-shaped groove forms a movement guide for the part of the installation part inserted into the strip-shaped groove, so that the width between the two side support members outside the strip-shaped grooves is adjusted to the right position, the structure of the seat is simplified, the appearance of the seat is simple and elegant, and the use experience of the seat is improved.

[0006] The technical scheme of the utility model is as follows:

[0007] A chair back assembly comprises a back support and two side supports symmetrically arranged on the left and right sides of the back support, the back support is provided with a strip-shaped slot extending in the transverse direction, and the inner side of the side support is provided with a support surface; the side support is connected with a mounting portion inserted into the strip-shaped slot;

[0008] The strip-shaped slot can guide the movement of the portion of the mounting portion inserted into the strip-shaped slot, so that the two side supports can be moved close to or away from each other and then stopped at the corresponding positions, so as to adjust the distance between the two support surfaces to the desired position.

[0009] Preferably, the mounting portion is provided with a rack inside the strip-shaped slot, the two racks are staggered left and right, and the teeth of the two racks are engaged with a linkage gear at the same time; the linkage gear can be rotated by applying an external force to one of the side supports, so as to drive the two side supports to move close to or away from each other.

[0010] Preferably, the mounting portion is provided with a connecting piece matching the width of the strip-shaped slot, and the connecting piece is slidingly connected in the strip-shaped slot. The side support connected with the mounting portion can slide along the extension track of the strip-shaped slot, so as to adjust the distance between the two support surfaces.

[0011] Preferably, the strip-shaped slot itself is provided with limiting ends on the left and right sides, and when the two side supports are moved away from each other to the maximum width, the limiting ends abut against the corresponding connecting pieces; so that the two side supports will not be separated from the back support.

[0012] Preferably, at least one of the left side support and the right side support is provided with a control mechanism between the back support, and the control mechanism is configured to lock and unlock the corresponding side support moving left and right.

[0013] Preferably, the control mechanism comprises a control rod, 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 rod; when the control rod is separated from the corresponding gear hole, the corresponding side support can move left and right and adjust the distance between the two support surfaces; when the control rod is inserted into the corresponding gear hole, the corresponding side support can stay at the corresponding position after adjustment; so that the process of locking and unlocking the positions of the two side supports is simplified to the pulling process of the control rod.

[0014] Preferably, the mounting portion is provided with a connecting piece matching the width of the strip-shaped slot, and the connecting piece is provided with a guide slot extending in the front-rear direction, and the control rod is inserted into the guide slot.

[0015] Preferably, the back support is connected with a back plate at the front end, the back plate covers the front surface of the back support, and the back plate is provided with an avoiding slot for avoiding the left-right movement of the mounting portion; the back plate not only shields the linkage mechanism, but also provides avoiding space for the left-right sliding of the mounting portion, which is a clever design and achieves two goals at once.

[0016] Preferably, the mounting portions have connecting members matching the width of the slot, and the width of the avoiding slot is smaller than that of the slot, when the back plate is connected to the front end of the back support, the back plate is abutted against the connecting members to limit the gear and rack mechanism from being out of the slot.

[0017] Preferably, a deformable four-bar linkage is connected between the two mounting portions, the four-bar linkage is located in the slot, the four-bar linkage comprises two first links spaced apart and parallel to each other, two second links are hingedly connected between the two first links and parallel to each other, the middle part of the second link is hingedly connected in the slot through a rotating shaft, the mounting portions of the two side supports are connected to the two first links respectively, and an external force acting on one of the side supports can deform the four-bar linkage to drive the two side supports to move closer to or away from each other.

[0018] Preferably, the rotating shaft extends longitudinally and beyond the first link, and when the two side supports are moved away from each other to the maximum width, the rotating shaft abuts against and limits the rotation of the corresponding first link, so as to prevent the four-bar linkage from deforming excessively and causing the two side supports to be stuck.

[0019] Preferably, a screw and nut mechanism is connected between the two mounting portions, the screw and nut mechanism is located in the slot, the screw and nut mechanism comprises a first screw and a second screw which are symmetrical to each other and have opposite screw threads, the two mounting portions respectively have a first screw sleeve and a second screw sleeve which are screwed on the first screw and the second screw, and a driving assembly is arranged between the first screw and the second screw in the slot, the driving assembly can simultaneously drive the first screw and the second screw to rotate in the same direction to drive the two side supports to move closer to or away from each other.

[0020] Preferably, the driving assembly is a double-output motor having two same-direction output shafts with the same rotating direction, and the two same-direction output shafts are connected to the first screw and the second screw respectively.

[0021] Preferably, the driving assembly is two separate driving motors, each driving motor has a single output shaft, and the two single output shafts are connected to the first screw and the second screw respectively.

[0022] A seat comprising the chair back assembly.

[0023] The beneficial effects of the utility model with the above technical scheme are:

[0024] The mounting portion connected with the side support is inserted into the slot on the back support, and the slot forms a moving guide for the part of the mounting portion inserted into the slot, so that the two side supports exposed outside the slot are adjusted in place, and through the design of inserting the mounting portion into the slot, there is no extra part exposed on the back support, the appearance of the seat is optimized, and the sitting experience is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural schematic view of a chair back assembly;

[0026] Figure 2 is an enlarged view at a control lever;

[0027] Figure 3 is an exploded view of a chair back assembly;

[0028] Figure 4 is an exploded view of a chair back assembly from another angle;

[0029] Figure 5 is a schematic view of two side supports moving away from each other;

[0030] Figure 6 is a schematic view of two side supports moving towards each other;

[0031] Figure 7 is a sectional view of a control lever connection position;

[0032] Figure 8 is a schematic view of a four-bar linkage mechanism connecting two side supports in Example 2;

[0033] Figure 9 is a schematic view of a linkage mechanism in Example 3;

[0034] Figure 10 is a schematic view of two drive motors connected to first and second screws in Example 3;

[0035] The reference signs are as follows: 1-back support, 2-side support, 3-linkage gear, 4-control lever, 5-back plate, 6-four-bar linkage mechanism, 7-screw nut mechanism, 11-bar-shaped slot, 12-rotating shaft hole, 13-gear hole, 22-cushion, 23-mounting portion, 24-rack, 25-connection piece, 31-rotating shaft, 51-avoidance slot, 61-first connecting rod, 62-second connecting rod, 63-rotating shaft, 71-first screw, 72-second screw, 73-double-output motor, 74-stand, 75-drive motor, 111-limiting end, 231-first screw sleeve, 232-second screw sleeve, 251-insertion slot, 252-guide slot, 731-co-directional output shaft, 751-single-output shaft. DETAILED DESCRIPTION

[0036] In order to more clearly understand the above purpose, features and advantages of the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0037] 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.

[0038] This utility model has multiple embodiments, and the specific implementation methods are as follows:

[0039] Example 1: As Figures 1-7 As shown, this embodiment provides a chair back assembly, including a back support 1 and side support members 2 symmetrically arranged on the left and right sides of the back support 1. The back support 1 has a strip groove 11 extending laterally, and the inner side of the side support member 2 has a support surface. The side support member 2 is connected to a mounting part 23 that is inserted into the strip groove 11. The shape of the mounting part 23 includes, but is not limited to, plate-shaped, rod-shaped, etc.

[0040] The slot 11 can guide the part of the mounting part 23 inserted into the slot 11, so that the two side supports 2 outside the slot 11 move closer or further away from each other and stop at the corresponding position, so as to adjust the distance between the two support surfaces into place.

[0041] Furthermore, the mounting part 23 is provided with racks 24 located in the strip groove 11. The two racks 24 are staggered left and right, and the teeth of the two racks 24 mesh with the linkage gear 3 at the same time. The two racks 24 and the linkage gear 3 constitute a linkage structure. The two ends of the linkage gear 3 have rotating shafts 31. Rotating shaft holes 12 matching the rotating shafts 31 are opened on the corresponding side walls of the strip groove 11. The rotating shafts 31 are inserted into the rotating shaft holes 12, so that the linkage gear 3 can rotate. When an external force is applied to one of the side support members 2, the part of the corresponding mounting part 23 inserted into the strip groove 11 can make the linkage gear 3 rotate, so as to drive the two side support members 2 to move closer or further apart.

[0042] Furthermore, to make the side support 2 slide more smoothly left and right, the mounting part 23 has a connector 25 that matches the width of the strip groove 11. The connector 25 is slidably connected in the strip groove 11. The connector 25 has a slot 251, and the mounting part 23 is inserted into the slot and locked with screws. This allows the side support 2 connected to the mounting part 23 to slide along the extension trajectory of the strip groove 11 to adjust the distance between the two support surfaces. In order to prevent the two side support 2 from coming off the back support 1, the strip groove 11 itself has limiting ends 111 on the left and right sides. When the two side support 2 are far apart to their maximum width, the limiting ends 111 abut against the corresponding connector 25.

[0043] Further, 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 for locking and unlocking the two side supports 2 that are slid into position; specifically, in order to ensure sufficient locking force on the side support 2, the control mechanism is provided between the left and right side supports 2 and the back support 1 in this embodiment, and the control mechanism includes a control rod 4, the back support 1 is provided with a plurality of gear holes 13 arranged in the left-right direction and used for cooperating with the control rod 4, when the control rod 4 is out of the corresponding gear hole 13, the corresponding side support 2 can move left and right and adjust the distance between the two support surfaces; when the control rod 4 is inserted into the corresponding gear hole 13, the corresponding side support 2 can stay at the corresponding position after adjustment; thereby the position locking and unlocking process of the two side supports 2 is simplified to the pulling process of the control rod 4, which is convenient for the user to operate the control rod 4 to lock or unlock the position of the side support 2.

[0044] Further, the connection mode of the control rod 4 is as follows: the connecting piece 25 is provided with a guide groove 252 extending in the front-rear direction, and the control rod 4 is inserted in the guide groove 252; and the control rod 4 has a side extension 41 extending to the inside of the control rod 4 at a position close to the back support 1 on the rod body, and the side extension 41 is opposite to the position of the side support 2; when the control rod 4 is out of the corresponding gear hole 13, the side extension 41 abuts against the side support 2; so as to avoid the control rod 4 from falling off the rib side support assembly when the control rod 4 is out of the gear hole 13.

[0045] Further, in order to facilitate the left and right movement of the mounting portion 23, the front end of the strip-shaped groove 11 is open outward, but the exposed mounting portion 23 and the gear and rack mechanism not only look not simple in appearance, but also may be out of the strip-shaped groove 11, therefore, in this embodiment, the back plate 5 is connected to the front end of the back support 1, the back plate 5 covers the front surface of the back support 1, and the back plate 5 is provided with an avoiding groove 51; the avoiding groove 51 can avoid the mounting portion 23, so that the linkage structure is not exposed, and at the same time, the side support 2 can move left and right normally, the width of the avoiding groove 51 is less than the width of the strip-shaped groove 11, when the back plate 5 is connected to the front end of the back support 1, the back plate 5 abuts against the connecting piece 25 rearward to limit the gear and rack mechanism from out of the strip-shaped groove 11.

[0046] Further, the support surface of the side support 2 is connected with a soft pad 22; the soft pad 22 can provide soft support touch for the rib side and improve the sitting experience.

[0047] Further, in order 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 rib sides of children or adults with different body shapes after sitting.

[0048] Furthermore, a seat is provided, including the aforementioned backrest assembly; when the user sits on the seat, the distance between the two side support members 2 can be changed through a linkage structure, so that the side support members 2 on both sides are always close to the sides of the waist, thereby playing a role in waist correction.

[0049] Example 2: As Figure 8 As shown, the difference between this embodiment and the above embodiment is that a deformable four-bar linkage 6 is connected between the two mounting parts 23. The four-bar linkage 6 is located in the strip groove 11. The four-bar linkage 6 includes two first links 61 that are spaced apart and parallel to each other. Two second links 62 that are parallel to each other are hinged between the two first links 61. The two first links 61 and the two second links 62 form a linkage structure. The middle part of the second link 62 is hinged in the strip groove 11 through a rotating shaft 63. The mounting parts 23 of the two side supports 2 are respectively connected to the two first links 61. When an external force is applied to one of the side supports 2, the four-bar linkage 6 can be deformed, causing the two first links 61 to move in opposite directions, so as to drive the two side supports 2 to move closer or further apart.

[0050] Furthermore, to ensure that the four-bar linkage 6 can properly link the two side supports, the rotating shaft 63 extends longitudinally and beyond the first link 61. When the two side supports 2 are far apart to their maximum width, the rotating shaft 63 abuts against and restricts the rotation of the corresponding first link 61; to prevent excessive deformation of the four-bar linkage structure from causing the two side supports 2 to jam.

[0051] Example 3: As Figures 9-10 As shown, the difference between this embodiment and the above embodiment is that a screw and nut mechanism 7 is connected between the two mounting parts 23. The screw and nut mechanism 7 is located in the strip groove 11. The screw and nut mechanism 7 includes a first screw 71 and a second screw 72 that are symmetrical from left to right and have opposite thread directions. The two mounting parts 23 respectively have a first screw sleeve 231 and a second screw sleeve 232 that are screwed onto the first screw 71 and the second screw 72. The first screw 71, the second screw 72, the first screw sleeve 231, and the second screw sleeve 232 constitute a complete system. The spiral linkage structure; since the connector 23 on the mounting part 23 is slidably connected in the strip groove 11, the first spiral sleeve 231 and the second spiral sleeve 232 will not rotate with the rotation of the first screw 71 and the second screw 72, but will move laterally left and right; a drive assembly is provided between the first screw 71 and the second screw 72 in the strip groove 11. When adjusting the distance between the two side support members 2, the drive assembly can simultaneously drive the first screw 71 and the second screw 72 to rotate in the same direction, so as to drive the two side support members 2 to move closer or further away from each other.

[0052] Furthermore, such as Figure 9As shown, the driving assembly can be a double output motor 73 having two same direction output shafts 731 connected with the first screw rod 71 and the second screw rod 72 respectively, the connection mode including but not limited to key connection, screw connection or shaft coupling connection.

[0053] Further, as shown, the driving assembly can also be two separate driving motors 75 having single output shafts 751 connected with the first screw rod 71 and the second screw rod 72 respectively, the connection mode including but not limited to key connection, screw connection or shaft coupling connection. Figure 10

[0054] The above description of the utility model and its embodiments is illustrative, not restrictive, and the embodiments shown in the drawings are 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 by the above description, without departing from the spirit of the utility model, similar structural modes and embodiments can be designed without creativity, which should belong to the protection scope of the utility model.​

Claims

1. A chair back assembly, characterized in that, It includes 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 back support member (1) has a strip groove (11) extending in the transverse direction. The inner side of the side support member (2) has a support surface. The side support member (2) is connected to an installation part (23) that is inserted into the strip groove (11). The slot (11) can guide the part of the mounting part (23) inserted into the slot (11) to move, so that the two side supports (2) outside the slot (11) move closer or further away from each other and stop at the corresponding position, so as to adjust the distance between the two support surfaces to the correct position.

2. A chair back assembly according to claim 1, characterized in that: The mounting part (23) is provided with a rack (24) in the strip groove (11). The two racks (24) are staggered left and right, and the teeth of the two racks (24) are simultaneously engaged with the linkage gear (3). When an external force is applied, one of the side support members (2) can cause the linkage gear (3) to rotate, so as to drive the two side support members (2) to move closer or further away from each other.

3. A chair back assembly according to claim 1, characterized in that: The mounting part (23) has a connector (25) that matches the width of the strip groove (11), and the connector (25) is slidably connected in the strip groove (11).

4. A chair back assembly according to claim 3, characterized in that: The strip groove (11) has limiting ends (111) on its left and right sides. When the two side supports (2) move away from each other to the maximum width, the limiting ends (111) abut against the corresponding connecting parts (25).

5. A chair back assembly according to claim 1, characterized in that: At least one of the left-side side support (2) and the right-side side support (2) is provided with a control mechanism between itself and the back support (1). The control mechanism is configured to lock and unlock the position of the corresponding side support (2) that moves left and right.

6. A chair back assembly according to claim 5, characterized in that: The control mechanism includes a control lever (4). The back support (1) is provided with multiple gear holes (13) arranged at intervals in the left and right direction and used to cooperate with the control lever (4). When the control lever (4) is disengaged from the corresponding gear hole (13), the corresponding side support (2) can move left and right and adjust the distance between the two support surfaces. When the control lever (4) is inserted into the corresponding gear hole (13), the corresponding side support (2) can stay in the adjusted corresponding position.

7. A chair back assembly according to claim 6, characterized in that: The mounting part (23) has a connector (25) that matches the width of the strip groove (11). The connector (25) has a guide groove (252) extending in the front-back direction. The control rod (4) is inserted in the guide groove (252).

8. A chair back assembly according to claim 1, characterized in that: The back support member (1) is connected to a back plate (5) at the front end. The back plate (5) covers the front surface of the back support member (1), and the back plate (5) is provided with a clearance groove (51) for avoiding the left and right movement of the mounting part (23).

9. A chair back assembly according to claim 8, characterized in that: The mounting part (23) has a connector (25) that matches the width of the strip groove (11); the width of the clearance groove (51) is smaller than the width of the strip groove (11). When the back plate (5) is connected to the front end of the back support (1), the back plate (5) pushes against the connector (25) to restrict the gear rack mechanism from disengaging from the strip groove (11).

10. A chair back assembly according to claim 1, characterized in that: A deformable four-bar linkage (6) is connected between the two mounting parts (23). The four-bar linkage (6) is located in the strip groove (11). The four-bar linkage (6) includes two first links (61) that are spaced apart and parallel to each other. Two second links (62) that are parallel to each other are hinged between the two first links (61). The middle part of the second link (62) is hinged in the strip groove (11) through a pivot (63). The mounting parts (23) of the two side supports (2) are respectively connected to the two first links (61). When an external force is applied to one of the side supports (2), the four-bar linkage (6) can be deformed so as to drive the two side supports (2) to move closer or further apart.

11. A chair back assembly according to claim 10, characterized in that: The pivot (63) extends longitudinally beyond the first link (61), and when the two side supports (2) are far apart to their maximum width, the pivot (63) abuts against and restricts the rotation of the corresponding first link (61).

12. A chair back assembly according to claim 1, characterized in that: A screw and nut mechanism (7) is connected between the two mounting parts (23). The screw and nut mechanism (7) is located in the strip groove (11). The screw and nut mechanism (7) includes a first screw (71) and a second screw (72) that are symmetrical and have opposite screw directions. The two mounting parts (23) have a first screw sleeve (231) and a second screw sleeve (232) that are screwed together on the first screw (71) and the second screw (72). A drive assembly located in the strip groove (11) is provided between the first screw (71) and the second screw (72). The drive assembly can drive the first screw (71) and the second screw (72) to rotate in the same direction at the same time, so as to drive the two side support members (2) to move closer to each other or further away.

13. A chair back assembly according to claim 12, characterized in that: The drive assembly is a dual-output motor (73), which has two output shafts (731) with the same rotation direction. The two output shafts (731) are connected to the first screw (71) and the second screw (72) respectively.

14. A chair back assembly according to claim 12, characterized in that: The drive assembly consists of two separate drive motors (75), each with a single output shaft (751), which are connected to a first screw (71) and a second screw (72) respectively.

15. A seat, characterized in that: Includes the chair back assembly as described in claim 1.

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