Chair back capable of being adjusted in tipping mode and backrest chair

Abstract

The utility model relates to a chair back capable of being adjusted in a tipping mode, which comprises a chair back frame and a chair back support, the chair back frame is in shaft connection with the chair back support, the lower portion of the chair back frame is connected with the chair back support through a connecting rod assembly, an elastic component is arranged between the lower portion of the chair back frame and the chair back support, one end of the elastic component is fixed on the chair back support, and the other end of the elastic component is fixed on the chair back support. The other end is fixed at the lower part of the chair back frame; and the elastic part is elastically deformed while approaching or leaving the chair back bracket along with the lower end of the chair back frame. The utility model further relates to a back-rest chair which comprises the chair back capable of being adjusted in a tipping mode. According to the scheme, the connecting rod assembly and the elastic component can be driven to contract while the chair back is subjected to tipping adjustment, and the connecting rod assembly can assist in limiting the tipping adjustment amplitude of the chair back and can limit the moving path of the tipping adjustment of the chair back, so that the overall movement is more stable.

Description

Technical Field

[0001] The utility model relates to the technical field of backrest chairs, in particular to a chair back frame and a backrest chair capable of being adjusted inclination and reclining. Background Art

[0002] The Chinese utility model patent with publication number CN201360764Y discloses an office chair backrest tilt-adjustable structure, which discloses a backrest and a backrest bracket, wherein the backrest is rotatably connected to the backrest bracket, and an elastic component is located between the backrest and the backrest bracket, respectively abutting against the backrest and the backrest bracket, so as to realize the concept of adjusting the backrest tilt and automatically resetting. A specific solution is given in its specification, which clarifies that the backrest is axially connected to the backrest bracket through a pin, and the elastic component is a torsion spring, which is sleeved on the pin.

[0003] The above scheme can achieve the tilt adjustment and automatic reset of the chair back, and the elastic component is arranged at the pivot position, that is, sleeved on the pin. Since the only connection point between the chair back and the chair back bracket is the pivot position, the pivot position is subjected to a large force, and the elastic component arranged at the position applies a large force to the pivot position, resulting in the easy damage of the pivot connection between the chair back and the chair back bracket. Therefore, it is necessary to improve the arrangement of the elastic component. Summary of the invention

[0004] In order to solve the above problems, the purpose of the utility model is to provide a chair back and a backrest chair with adjustable tilt.

[0005] A chair back that can be adjusted in tilt and recline includes a chair back frame and a chair back bracket, the chair back frame is axially connected to the chair back bracket, and the lower part of the chair back frame is connected to the chair back bracket through a connecting rod assembly, the connecting rod assembly includes a first connecting rod and a second connecting rod, the first end of the first connecting rod is hinged to the chair back bracket at a first hinge point, the second end of the first connecting rod is hinged to the second end of the second connecting rod, and the first end of the second connecting rod is hinged to the lower part of the chair back frame at a second hinge point, wherein the first hinge point is fixed on the chair back bracket, and the second hinge point is fixed on the chair back frame; an elastic component is provided between the lower part of the chair back frame and the chair back bracket, one end of the elastic component is fixed on the chair back bracket, and the other end is fixed on the lower part of the chair back frame; the elastic component undergoes elastic deformation as the lower end of the chair back frame approaches or moves away from the chair back bracket.

[0006] Preferably, the backrest bracket is provided with a connecting seat protruding toward the backrest frame, the first connecting rod is "H"-shaped, the first connecting rod can be rotated and contracted to be in the same plane with the connecting seat, and the hinge point between the second end of the first connecting rod and the second end of the second connecting rod is located above the connecting seat.

[0007] Preferably, the elastic component is a spring.

[0008] Preferably, the seat back frame is connected to the first end of the second connecting rod and one end of the spring through a same pin; the other end of the spring is fixed to the seat back bracket.

[0009] Preferably, the chair back support includes two side support rods arranged symmetrically on the left and right and a cross bar transversely connecting the two side support rods, the lower parts of the two side support rods are arranged in a U shape, and a connecting plate is provided in the U-shaped groove between the two side support rods, and the connecting rod assembly is arranged on the connecting plate.

[0010] Preferably, the upper portion of the support rod is bent toward the chair back frame, and a connecting end is formed at the upper end of the support rod. A plug-in groove that cooperates with the connecting end is provided at a position corresponding to the upper end of the support rod on the chair back frame, and the inner circumferential surface of the plug-in groove is a circular surface.

[0011] The utility model also aims to provide a chair with a backrest, comprising a chair back that can be tilted and adjusted as described in any one of the above items.

[0012] The utility model adopts the above scheme, and sets the elastic component independently from the axial connection point between the backrest frame and the backrest bracket, which can reduce the force on the axial connection between the backrest frame and the backrest bracket, and ensure the strength of the axial connection. In addition, the elastic component is set at the lower part of the backrest frame, and a connecting rod assembly is provided between the backrest frame and the backrest bracket at the position where the elastic component is set. When the backrest is tilted and reclined, the connecting rod assembly and the elastic component can be driven to contract. The connecting rod assembly can assist in limiting the tilt adjustment range of the backrest, and at the same time, it can limit the moving path of the backrest tilt adjustment, making its overall movement more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of a reclining and tilting adjustable chair back in Embodiment 1;

[0014] Figure 2 for Figure 1 AA section view;

[0015] Figure 3 for Figure 1 A schematic diagram of the structure from another angle;

[0016] Figure 4 for Figure 1 A schematic diagram of the structure from another angle;

[0017] Figure 5 for Figure 1 A schematic diagram of the structure from another angle;

[0018] Figure 6 A schematic structural diagram of the armchair designed for Example 2.

[0019] Reference numerals:

[0020] A seat back frame 1 , a seat back bracket 2 , two side support rods 21 , a cross bar 22 , a seat seat fixing portion 23 , a connecting plate 24 , a connecting seat 25 , an elastic component 3 , a first connecting rod 41 , and a second connecting rod 42 . DETAILED DESCRIPTION

[0021] The embodiments of the present utility model are described in detail below.

[0022] Embodiment 1:

[0023] This embodiment provides a chair back that can be tilted and adjusted. Figure 1-5 As shown, it includes a seat back frame 1 and a seat back bracket 2. The seat back frame 1 is axially connected to the seat back bracket 2. The seat back frame 1 can be tilted and adjusted relative to the seat back bracket 2 with the axial joint as the rotation center.

[0024] In this embodiment, the chair back bracket 2 includes two side support rods 21 that are symmetrically arranged on the left and right and a cross bar 22 that transversely connects the two side support rods 21. The lower parts of the two side support rods 21 are arranged in a U shape, and the lower ends of the two side support rods 21 of the chair back are close to each other and extend toward the lower end of the seat to form a seat fixing part 23. The seat fixing part 23 is provided with a plurality of screw holes, and the chair back bracket 2 is connected and fixed to the seat through the seat fixing part 23.

[0025] The upper parts of the two side support rods 21 of the backrest bracket 2 are bent toward the backrest frame 1, and connecting ends are formed at the upper ends of the support rods, wherein the connecting ends are cylindrical or ball-shaped, and a plug-in slot corresponding to the upper ends of the support rods is provided on the backrest frame 1, and the inner circumference of the plug-in slot is a circular surface. After the connecting end is plugged into the plug-in slot, the connecting end can rotate around the plug-in slot. In addition, the above-mentioned axial joints are provided at symmetrical positions on the left and right side walls of the backrest frame 1, so that the backrest frame 1 can be adjusted forward and backward relative to the backrest. Since the axial joint is close to the middle of the backrest frame 1, while the backrest is adjusted to tilt, the lower part of the backrest frame 1 simultaneously moves closer to or away from the backrest bracket 2.

[0026] In this embodiment, an elastic component 3 is provided between the lower part of the backrest frame 1 and the backrest bracket 2, one end of the elastic component 3 is fixed to the backrest bracket 2, and the other end is fixed to the lower part of the backrest frame 1; the elastic component 3 is elastically deformed as the lower end of the backrest frame 1 approaches or moves away from the backrest bracket 2. Figure 2-5As shown, the lower part of the backrest frame 1 is connected to the backrest bracket 2 through a connecting rod assembly, and the elastic component 3 is located below the connecting rod assembly and shielded from the outside by the connecting rod assembly. When the backrest is adjusted to recline, the connecting rod assembly and the elastic component 3 act synchronously. The connecting rod assembly includes a first connecting rod 41 and a second connecting rod 42, wherein the first end of the first connecting rod 41 is hinged to the backrest bracket 2 at a first hinge point, the second end of the first connecting rod 41 is hinged to the second end of the second connecting rod 42, and the first end of the second connecting rod 42 is hinged to the lower part of the backrest frame 1 at a second hinge point, wherein the first hinge point is fixed on the backrest bracket 2, and the second hinge point is fixed on the backrest frame 1. The connecting rod assembly shields the elastic component 3 from the outside, and the overall appearance is more concise and beautiful. The connecting rod assembly can assist in limiting the reclining adjustment range of the backrest, and at the same time can limit the moving path of the backrest reclining adjustment, so that its overall movement is more stable.

[0027] The elastic component 3 in this embodiment is a spring. Figure 2 and Figure 5 As shown, the seat back frame 1 is connected to the first end of the second connecting rod 42 and one end of the spring through the same pin; the other end of the spring is fixed to the seat back bracket 2. The above method can realize reliable fixing of the spring to prevent it from being separated from its installation position during the extension and retraction process.

[0028] In this embodiment, a connecting plate 24 is provided in the U-shaped groove between the two side support rods 21 of the backrest bracket 2, and the connecting rod assembly is arranged on the connecting plate 24. Firstly, the arrangement of the connecting plate 24 can enhance the integrity of the backrest bracket 2 and thus enhance the strength of the backrest bracket 2. Secondly, the arrangement of the connecting plate 24 provides a mounting base for the connecting rod assembly and the elastic component 3, so that the connecting rod assembly and the elastic component 3 can be arranged in the middle of the backrest. Preferably, in this embodiment, a connecting seat 25 protruding toward the backrest frame 1 is provided on the backrest bracket 2. When the connecting plate 24 is provided, the connecting seat 25 is arranged on the connecting plate 24. The first connecting rod 41 is in an "H" shape. The first connecting rod 41 can be rotated and retracted to be in the same plane as the connecting seat 25, and the hinge point between the second end of the first connecting rod 41 and the second end of the second connecting rod 42 is located above the connecting seat 25. This arrangement can prevent the hinge between the first connecting rod 41 and the second connecting rod 42 from hindering the first connecting rod 41 from completely shrinking to the same plane or approximately the same plane as the connecting seat 25, so that the connection structure of the seat back frame 1, the connecting rod assembly, the elastic component 3 and the seat back bracket 2 is more compact within the tilt adjustment range of the seat back frame 1.

[0029] Embodiment 2:

[0030] like Figure 6 As shown, this embodiment provides a chair with a reclining backrest, and the chair with a reclining backrest is specifically shown in Embodiment 1.

[0031] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A chair back with adjustable reclining and tilting function, comprising a chair back frame and a chair back bracket, wherein the chair back frame and the chair back bracket are axially connected, and characterized in that: The lower part of the seat back frame is connected to the seat back bracket through a connecting rod assembly, and the connecting rod assembly includes a first connecting rod and a second connecting rod, the first end of the first connecting rod is hinged to the seat back bracket at a first hinge point, the second end of the first connecting rod is hinged to the second end of the second connecting rod, and the first end of the second connecting rod is hinged to the lower part of the seat back frame at a second hinge point, wherein the first hinge point is fixed on the seat back bracket, and the second hinge point is fixed on the seat back frame; an elastic component is provided between the lower part of the seat back frame and the seat back bracket, one end of the elastic component is fixed on the seat back bracket, and the other end is fixed to the lower part of the seat back frame; the elastic component undergoes elastic deformation as the lower end of the seat back frame approaches or moves away from the seat back bracket.

2. The tilt-adjustable chair back according to claim 1, characterized in that: The backrest bracket is provided with a connecting seat protruding toward the backrest frame. The first connecting rod is "H" shaped. The first connecting rod can be rotated and contracted to be in the same plane with the connecting seat, and the hinge point between the second end of the first connecting rod and the second end of the second connecting rod is located above the connecting seat.

3. The tilt-adjustable chair back according to claim 1, characterized in that: The elastic component is a spring.

4. The tilt-adjustable chair back according to claim 3, characterized in that: The seat back frame is connected with the first end of the second connecting rod and one end of the spring through a same pin shaft; the other end of the spring is fixed on the seat back bracket.

5. The tilt-adjustable chair back according to claim 1, characterized in that: The chair back support includes two side support rods symmetrically arranged on the left and right and a cross bar transversely connecting the two side support rods. The lower parts of the two side support rods are arranged in a U shape, and a connecting plate is arranged in the U-shaped groove between the two side support rods. The connecting rod assembly is arranged on the connecting plate.

6. The tilt-adjustable chair back according to claim 5, characterized in that: The upper part of the support rod is bent toward the chair back frame, and a connecting end is formed at the upper end of the support rod. A plug-in groove for plugging with the connecting end is provided on the chair back frame at a position corresponding to the upper end of the support rod, and the inner circumferential surface of the plug-in groove is a circular surface.

7. A backrest chair, characterized in that: The utility model comprises a tilt-adjustable chair back as claimed in any one of claims 1 to 6.

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