A backrest connecting device and a hand rocking lifting single back learning chair using the same

Abstract

The utility model belongs to the technical field of children's chair, especially relates to a chair back connecting device and hand -operated lifting single -back study chair with the device. Back connecting seat and chair back assembly rear side are connected. Honeycomb elastomer is located back connecting seat rear side. U-shaped hardware rear end and honeycomb elastomer front end are connected. Cylindrical spring is located between back connecting seat and U-shaped hardware. U-shaped hardware front end is connected with back connecting seat through first pivot. Back connecting assembly is located honeycomb elastomer rear side. Back connecting assembly front end is connected with honeycomb elastomer through second pivot. Through setting back connecting seat, honeycomb elastomer, U-shaped hardware, cylindrical spring, first pivot, back connecting assembly and second pivot, make chair back assembly have two kinds of elastic mode: honeycomb elastomer and cylindrical spring produce elasticity, can realize steel soft combination, make chair back assembly more comfortable durable, conform to ergonomics, be favorable to to the back protection effect to children.

Description

Technical Field

[0001] This utility model belongs to the field of children's chair technology, and specifically relates to a chair back connecting device and a hand-cranked height-adjustable single-back study chair using the device. Background Technology

[0002] Study chairs are a common type of seating for children and teenagers, and they can play a significant role in health, myopia prevention, and posture correction.

[0003] However, existing study chairs have relatively hard backrests, which are insufficient to support children's delicate backs. Therefore, it is necessary to design a backrest connection device and a hand-cranked height-adjustable single-back study chair using this device to solve the above problems. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a chair back connecting device and a hand-cranked height-adjustable single-back study chair using the device, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a chair back connecting device applied to a study chair, the study chair including a chair back assembly, a hand-cranked lifting upright tube assembly, a seat assembly, and a chair leg assembly, wherein the outer tube of the hand-cranked lifting upright tube assembly is slidably locked to the chair back assembly, the bottom of the outer tube of the hand-cranked lifting upright tube assembly is fixedly connected to the seat assembly, and the bottom of the inner tube of the hand-cranked lifting upright tube assembly is connected to the chair leg assembly; the chair back connecting device includes:

[0006] Back connector, which is connected to the rear side of the chair back assembly;

[0007] A honeycomb elastomer, the honeycomb elastomer being located on the rear side of the back connector;

[0008] U-shaped hardware, the U-shaped hardware is located between the back connector and the honeycomb elastomer, and the rear end of the U-shaped hardware is connected to the front end of the honeycomb elastomer;

[0009] A cylindrical spring, located between the back connector and the U-shaped hardware;

[0010] The first rotating shaft connects the front end of the U-shaped hardware to the back connecting seat, and the axial direction of the first rotating shaft is to the left and right.

[0011] A back connection assembly located on the rear side of the honeycomb elastomer;

[0012] The second rotating shaft is connected to the honeycomb elastomer at the front end of the back connecting assembly via the second rotating shaft. The axial direction of the second rotating shaft is parallel to the axial direction of the first rotating shaft. The rear end of the back connecting assembly is used to connect to the outer tube of the hand-cranked lifting riser assembly.

[0013] Furthermore, the chair back connecting device also includes screws, and the honeycomb elastomer includes a cylinder, ribs, and a flat wall. The cylinder is coaxially distributed with the second rotating shaft. The cylinder is configured as a hollow structure. Multiple ribs are distributed around the cylinder. The flat wall is connected to the front end of the cylinder. Screw holes are provided on the flat wall. A first through hole is provided on the U-shaped hardware. The screw passes through the first through hole and the screw hole in sequence.

[0014] The chair back connecting device also includes two protrusions, which are respectively connected to the left and right sides of the back connecting seat. The front end of the U-shaped hardware is located between the two protrusions. A second through hole is opened on the protrusion, and a third through hole is opened on the front end of the U-shaped hardware. The first rotating shaft passes through the second through hole and the third through hole.

[0015] Furthermore, the back connection assembly includes a plate and a back connection ring. Two plates are provided, and the cylinder is located between the two plates. The two plates are connected to the front end of the back connection ring. The two plates correspond one-to-one with the two protrusions. A concave hole is provided at the front end of the plate, and a semi-circular arc-shaped protrusion is provided at the rear end of the protrusion. The outline of the concave hole matches the outline of the semi-circular arc-shaped protrusion. A fourth through hole is provided on the plate, and the second rotating shaft passes through the fourth through hole and the center of the cylinder.

[0016] Furthermore, the chair back connecting device also includes a protruding post, the rear end of the back connecting seat is connected to the protruding post, the U-shaped hardware is connected to the protruding post, and the front and rear ends of the column spring are respectively sleeved on the outer sides of the front and rear protruding posts.

[0017] Furthermore, the chair back connecting device also includes a locking component and a locking nut. The locking nut is connected to the back connecting ring, and the back connecting ring has a fifth through hole. One end of the locking component is threaded to the locking nut and passes through the fifth through hole to connect to the hand-cranked lifting upright assembly.

[0018] This utility model also discloses a hand-cranked height-adjustable single-back study chair using the device, including a backrest assembly, a hand-cranked height-adjustable upright tube assembly, a seat assembly, and a leg assembly. The middle part of the hand-cranked height-adjustable upright tube assembly is connected to the seat assembly, and the lower end of the hand-cranked height-adjustable upright tube assembly is connected to the leg assembly. It also includes a backrest connecting device as described above, and the upper end of the hand-cranked height-adjustable upright tube assembly is connected to the backrest assembly through the backrest connecting device.

[0019] The technical effects and advantages of this utility model are as follows:

[0020] 1. By setting up a backrest connector, honeycomb elastomer, U-shaped hardware, column spring, first pivot, backrest connector assembly and second pivot, the chair back assembly has two elastic modes: the honeycomb elastomer and the column spring generate elasticity, which can achieve a combination of steel and softness, making the chair back assembly more comfortable and durable, ergonomic, and beneficial to protecting children's backs.

[0021] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the structures pointed out in the description and drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the backrest connecting device according to an embodiment of the present invention is shown;

[0024] Figure 2 The image shows the usage state of the chair back connecting device according to an embodiment of the present invention;

[0025] Figure 3 An exploded view of the chair back connecting device according to an embodiment of the present invention is shown.

[0026] Figure 4 A schematic diagram of the structure of the U-shaped hardware component according to an embodiment of the present invention is shown;

[0027] Figure 5 A schematic diagram of the structure of the honeycomb elastomer according to an embodiment of the present invention is shown;

[0028] Figure 6A schematic diagram of the back connection assembly according to an embodiment of the present invention is shown;

[0029] Figure 7 A schematic diagram of the structure of a hand-cranked, height-adjustable single-back study chair using the device according to an embodiment of the present invention is shown.

[0030] Reference numerals: 1. Backrest assembly; 2. Hand-cranked lifting upright assembly; 3. Seat assembly; 4. Leg assembly; 5. Backrest connector; 6. Honeycomb elastomer; 7. U-shaped hardware; 8. Columnar spring; 9. First pivot; 10. Backrest connector assembly; 11. Second pivot; 12. Screw; 13. Cylinder; 14. Rib; 15. Flat wall; 16. Screw hole; 17. First through hole; 18. Protrusion; 19. Second through hole; 20. Third through hole; 21. Plate; 22. Backrest connector ring; 23. Recessed hole; 24. Semi-circular protrusion; 25. Fourth through hole; 26. Protruding post; 27. Locking assembly; 28. Locking nut; 29. ​​Fifth through hole; 30. Embedded nut; 31. Tube sleeve; 32. Pivot spring washer; 33. Pivot decorative nut. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] like Figures 1 to 4 as well as Figure 7As shown in the figure, a chair back connecting device according to an embodiment of the present invention is applied to a study chair. The study chair includes a chair back assembly 1, a hand-cranked lifting upright tube assembly 2, a seat assembly 3, and a chair leg assembly 4. The outer tube of the hand-cranked lifting upright tube assembly 2 is slidably locked to the chair back assembly 1, the bottom of the outer tube of the hand-cranked lifting upright tube assembly 2 is fixedly connected to the seat assembly 3, and the bottom of the inner tube of the hand-cranked lifting upright tube assembly 2 is connected to the chair leg assembly 4. The chair back connecting device includes a back connecting seat 5, a honeycomb elastomer 6, a U-shaped hardware component 7, a cylindrical spring 8, a first rotating shaft 9, a back connecting assembly 10, and a second rotating shaft 11. The back connecting seat 5 is connected to the rear side of the chair back assembly 1. The honeycomb elastomer 6 is located behind the back connecting seat 5. The U-shaped hardware component 7 is located between the back connecting seat 5 and the honeycomb elastomer 6, and the rear end of the U-shaped hardware component 7 is connected to the front end of the honeycomb elastomer 6. The cylindrical spring 8 is located between the back connecting seat 5 and the U-shaped hardware 7. The front end of the U-shaped hardware 7 is connected to the back connecting seat 5 via the first rotating shaft 9, the axial direction of the first rotating shaft 9 being oriented left and right. The back connecting assembly 10 is located behind the honeycomb elastomer 6. The front end of the back connecting assembly 10 is connected to the honeycomb elastomer 6 via the second rotating shaft 11, the axial direction of the second rotating shaft 11 being parallel to the axial direction of the first rotating shaft 9, and the rear end of the back connecting assembly 10 is used to connect to the outer tube of the hand-cranked lifting riser assembly 2.

[0033] Specifically, the backrest connector 5 is connected to the backrest assembly 1, and the U-shaped connector is connected to the backrest connector 5 via the first pivot 9. A columnar spring 8 is installed between the backrest connector 5 and the U-shaped connector, giving the backrest assembly 1 an elastic connection method that enhances its elasticity. Secondly, the U-shaped connector connects to the honeycomb elastomer 6, which is connected to the backrest assembly 10 via the second pivot 11. The backrest assembly 10 is connected to the hand-cranked lifting upright assembly 2, giving the backrest assembly 1 a second elastic connection method that further enhances its elasticity. Thus, by incorporating the backrest connector 5, honeycomb elastomer 6, U-shaped hardware 7, columnar spring 8, first pivot 9, backrest assembly 10, and second pivot 11, the backrest assembly 1 possesses two elastic modes: the honeycomb elastomer 6 and the columnar spring 8 provide elasticity, achieving a combination of steel and flexibility. This makes the backrest assembly 1 more comfortable and durable, ergonomically designed, and beneficial for children's back support.

[0034] In this embodiment, the honeycomb elastomer 6 is elastic. Secondly, the hand-cranked lifting riser assembly 2 includes an outer tube and an inner tube.

[0035] like Figures 3 to 5As shown, optionally, the chair back connecting device further includes a screw 12. The honeycomb elastomer 6 includes a cylinder 13, ribs 14, and a flat wall 15. The cylinder 13 is coaxially distributed with the second rotating shaft 11. The cylinder 13 is configured as a hollow structure. Multiple ribs 14 are distributed around the inner circumference of the cylinder 13. The flat wall 15 is connected to the front end of the cylinder 13. A screw hole 16 is provided on the flat wall 15. A first through hole 17 is provided on the U-shaped hardware 7. The screw 12 passes through the first through hole 17 and the screw hole 16 in sequence.

[0036] Specifically, by setting the honeycomb elastomer 6 as a cylinder 13 and making the cylinder 13 a hollow structure, the elastic effect of the honeycomb elastomer 6 is improved. Secondly, by distributing multiple ribs 14 around the cylinder 13, the structural strength of the honeycomb elastomer 6 is improved. In addition, by connecting a flat wall 15 to the cylinder 13 and using screws 12 passing through the first through hole 17 of the U-shaped hardware 7 and the screw holes 16 on the flat wall 15, it is convenient to connect the U-shaped hardware 7 to the honeycomb elastomer 6.

[0037] In this embodiment, the cylinder 13 can be integrally formed with the flat wall 15. Secondly, the chair back connecting device also includes a pre-embedded nut 30, which can be set in the screw hole 16, and the screw 12 is connected to the pre-embedded nut 30.

[0038] like Figure 3 and Figure 4 As shown, optionally, the chair back connecting device further includes a protrusion 18, and two protrusions 18 are provided. The two protrusions 18 are respectively connected to the left and right sides of the back connecting seat 5. The front end of the U-shaped hardware 7 is located between the two protrusions 18. A second through hole 19 is opened on the protrusion 18, and a third through hole 20 is opened on the front end of the U-shaped hardware 7. The first rotating shaft 9 passes through the second through hole 19 and the third through hole 20.

[0039] Specifically, by connecting two protrusions 18 to the left and right sides of the back connector 5, and placing the front end of the U-shaped hardware 7 between the two protrusions 18, the two protrusions 18 can be used to limit the position of the U-shaped hardware 7. Secondly, by using the first rotating shaft 9 to pass through the second through hole 19 on the two protrusions 18 and the third through hole 20 on the U-shaped hardware 7, it is convenient to connect the U-shaped hardware 7 to the back connector 5.

[0040] In this embodiment, the tab 18 can be integrally formed with the back connector 5.

[0041] like Figure 3 and Figure 6As shown, optionally, the back connection assembly 10 includes a plate 21 and a back connection ring 22. Two plates 21 are provided, and the cylinder 13 is located between the two plates 21. The two plates 21 are connected to the front end of the back connection ring 22. The two plates 21 correspond one-to-one with the two protrusions 18. A concave hole 23 is provided at the front end of the plate 21. A semi-circular arc-shaped protrusion 24 is provided at the rear end of the protrusion 18. The contour of the concave hole 23 matches the contour of the semi-circular arc-shaped protrusion 24. A fourth through hole 25 is provided on the plate 21. The second rotating shaft 11 passes through the fourth through hole 25 and the center of the cylinder 13.

[0042] Specifically, by setting plate 21 and matching the contour of the concave hole 23 at the front end of plate 21 with the semi-circular protrusion 24 at the rear end of protrusion 18, the stability of the connection between plate 21 and protrusion 18 can be improved, thereby improving the stability of the connection between back connection assembly 10 and back connection seat 5. Secondly, by opening a fourth through hole 25 on plate 21, and having the second rotating shaft 11 pass through the fourth through hole 25 and cylinder 13, plate 21 and cylinder 13 can be connected, thereby connecting back connection assembly 10 and honeycomb elastomer 6. In addition, by setting back connection ring 22, the upper end of hand-cranked lifting riser assembly 2 can pass through the middle of back connection ring 22 to facilitate the connection between back connection assembly 10 and the upper end of hand-cranked lifting riser assembly 2.

[0043] In this embodiment, the axial direction of the back connecting ring 22 is oriented vertically. Secondly, as... Figures 1 to 3 As shown, the chair back connecting device also includes a sleeve 31, which is located inside the back connecting ring 22 and connected to the upper end of the hand-cranked lifting upright assembly 2. Furthermore, the plate 21 can be integrally formed with the back connecting ring 22. Additionally, as... Figure 3 As shown, the chair back connecting device also includes a pivot spring washer 32 and a pivot decorative nut 33. The pivot spring washer 32 is sleeved on the second pivot 11, for example, it can be located between the plate 21 and the honeycomb elastomer 6, and the pivot decorative nut 33 is located at the end of the second pivot 11.

[0044] like Figure 4 As shown, optionally, the chair back connecting device further includes a protruding post 26, the rear end of the back connecting seat 5 is connected to the protruding post 26, the U-shaped hardware 7 is connected to the protruding post 26, and the front and rear ends of the column spring 8 are respectively sleeved on the outer sides of the front and rear protruding posts 26.

[0045] Specifically, by connecting protrusions 26 to both the rear end of the back connector 5 and the U-shaped hardware 7, and by fitting the front and rear ends of the cylindrical spring 8 onto the outer sides of the two protrusions 26 respectively, it is convenient to use the protrusions 26 to limit the cylindrical elasticity.

[0046] In this embodiment, two protruding posts 26 can be provided at the rear end of the back connector 5, and two protruding posts 26 are also connected to the U-shaped hardware 7, and two cylindrical springs 8 are provided. The two upper front and rear protruding posts 26 are used to limit the upper cylindrical spring 8, and the two lower front and rear protruding posts 26 are used to elastically limit the lower cylindrical spring 8. Furthermore, the protruding posts 26 can be integrally formed with the back connector 5 or integrally formed with the U-shaped hardware 7.

[0047] like Figure 3 and Figure 7 As shown, optionally, the chair back connecting device further includes a locking component 27 and a locking nut 28. The locking nut 28 is connected to the back connecting ring 22. The back connecting ring 22 has a fifth through hole 29. One end of the locking component 27 is threaded to the locking nut 28 and passes through the fifth through hole 29 to connect to the hand-cranked lifting upright assembly 2.

[0048] Specifically, an installation groove can be opened on the back connecting ring 22, and the locking nut 28 can be placed in the installation groove. Then, the end of the locking component 27 passes through the locking nut 28 and through the fifth through hole 29 to connect with the upper end of the hand-cranked lifting riser component 2.

[0049] In this embodiment, the locking component 27 can be configured as a screw.

[0050] like Figure 7 As shown in another embodiment of the present invention, a hand-cranked height-adjustable single-back study chair using the device includes a backrest assembly 1, a hand-cranked height-adjustable upright tube assembly 2, a seat assembly 3, and a leg assembly 4. The middle part of the hand-cranked height-adjustable upright tube assembly 2 is connected to the seat assembly 3, and the lower end of the hand-cranked height-adjustable upright tube assembly 2 is connected to the leg assembly 4. It also includes a backrest connecting device as described above, and the upper end of the hand-cranked height-adjustable upright tube assembly 2 is connected to the backrest assembly 1 through the backrest connecting device.

[0051] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A chair back connection device, applied to a study chair, the study chair comprising a chair back assembly (1), a hand-cranked lifting upright assembly (2), a seat assembly (3), and a chair leg assembly (4), wherein the outer tube of the hand-cranked lifting upright assembly (2) is slidably locked to the chair back assembly (1), the bottom of the outer tube of the hand-cranked lifting upright assembly (2) is fixedly connected to the seat assembly (3), and the bottom of the inner tube of the hand-cranked lifting upright assembly (2) is connected to the chair leg assembly (4), characterized in that, include: Back connector (5), which is connected to the rear side of the backrest assembly (1); Honeycomb elastomer (6), the honeycomb elastomer (6) is located on the rear side of the back connector (5); U-shaped hardware (7), the U-shaped hardware (7) is located between the back connector (5) and the honeycomb elastomer (6), and the rear end of the U-shaped hardware (7) is connected to the front end of the honeycomb elastomer (6); A cylindrical spring (8) is located between the back connector (5) and the U-shaped hardware (7); The first rotating shaft (9) is connected to the back connecting seat (5) through the front end of the U-shaped hardware (7). The axial direction of the first rotating shaft (9) is towards the left and right directions. A back connection assembly (10) is located on the rear side of the honeycomb elastomer (6); The second rotating shaft (11) is connected to the honeycomb elastomer (6) at the front end of the back connecting assembly (10). The axial direction of the second rotating shaft (11) is parallel to the axial direction of the first rotating shaft (9). The rear end of the back connecting assembly (10) is used to connect to the outer tube of the hand-cranked lifting riser assembly (2).

2. The chair back connecting device according to claim 1, characterized in that, It also includes screws (12). The honeycomb elastomer (6) includes a cylinder (13), ribs (14) and a flat wall (15). The cylinder (13) is coaxially distributed with the second rotating shaft (11). The cylinder (13) is configured as a hollow structure. Multiple ribs (14) are distributed around the inside of the cylinder (13). The flat wall (15) is connected to the front end of the cylinder (13). A screw hole (16) is provided on the flat wall (15). A first through hole (17) is provided on the U-shaped hardware (7). The screw (12) passes through the first through hole (17) and the screw hole (16) in sequence.

3. The chair back connecting device according to claim 2, characterized in that, It also includes two tabs (18), which are respectively connected to the left and right sides of the back connector (5). The front end of the U-shaped hardware (7) is located between the two tabs (18). A second through hole (19) is opened on the tab (18), and a third through hole (20) is opened on the front end of the U-shaped hardware (7). The first rotating shaft (9) passes through the second through hole (19) and the third through hole (20).

4. The chair back connecting device according to claim 3, characterized in that, The back connection assembly (10) includes a plate (21) and a back connection ring (22). There are two plates (21). The cylinder (13) is located between the two plates (21). The two plates (21) are connected to the front end of the back connection ring (22). The two plates (21) correspond one-to-one with the two protrusions (18). The front end of the plate (21) is provided with a concave hole (23). The rear end of the protrusion (18) is provided with a semi-circular arc-shaped protrusion (24). The outline of the concave hole (23) matches the outline of the semi-circular arc-shaped protrusion (24). The plate (21) is provided with a fourth through hole (25). The second rotating shaft (11) passes through the fourth through hole (25) and the center of the cylinder (13).

5. The chair back connecting device according to claim 1, characterized in that, It also includes a protruding post (26), the rear end of the back connecting seat (5) is connected to the protruding post (26), the U-shaped hardware (7) is connected to the protruding post (26), and the front and rear ends of the column spring (8) are respectively sleeved on the outside of the front and rear protruding posts (26).

6. The chair back connecting device according to claim 4, characterized in that, It also includes a locking assembly (27) and a locking nut (28), the locking nut (28) being connected to the back connecting ring (22), the back connecting ring (22) having a fifth through hole (29), one end of the locking assembly (27) being threadedly connected to the locking nut (28) and passing through the fifth through hole (29) to be connected to the hand-cranked lifting riser assembly (2).

7. A hand-cranked height-adjustable single-back study chair using the device, comprising a backrest assembly (1), a hand-cranked height-adjustable upright assembly (2), a seat assembly (3), and a leg assembly (4), wherein the upper end of the hand-cranked height-adjustable upright assembly (2) is connected to the backrest assembly (1), and the middle part of the hand-cranked height-adjustable upright assembly (2) is connected to the seat assembly (3), characterized in that, It also includes a backrest connection device as described in any one of claims 1 to 6, wherein the upper end of the hand-cranked lifting riser assembly (2) is connected to the backrest assembly (1) via the backrest connection device.

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