Chair and elasticity adjusting mechanism thereof

Abstract

The utility model discloses a chair and elasticity adjusting mechanism thereof, including the base that is used for installing the support leg, be used for installing the tailstock of chair back, be used for driving the elastic subassembly of tailstock reset, the tailstock with base hinge joint, the elastic subassembly is provided between base and the tailstock; the adjusting assembly is used for adjusting the elasticity of the elastic assembly and is arranged between the elastic assembly and the tailstock; the adjusting base assembly comprises a cam and an installation base, the cam is installed on the installation base in a rotatable mode, the installation base is fixed to the tailstock, the cam can abut against the elastic assembly, and the elastic assembly can be pushed when the cam rotates so that the elastic force of the elastic assembly can be changed. Through the arrangement, the reset force of the tailstock can be automatically adjusted, so that a user can adjust the reset force according to own habits, and better use experience is provided for the user.

Description

Technical Field

[0001] The utility model relates to the field of home furnishings, in particular to a chair and an elastic force adjustment mechanism thereof. Background Art

[0002] Chairs have become a necessary household item in people's daily lives, and most chairs have the function of adjusting the backrest angle. The chair tray, as an important connection and control component, is particularly important. Its safety and stability will directly affect the overall use of the chair.

[0003] The prior art with announcement number CN115177114A discloses a chair and its tray; it includes a base for installing chair legs, a top seat for installing chair seat and a tail seat for installing chair back, the base is movably connected to the top seat through a first connecting shaft, the base is hinged to the tail seat through a fourth connecting shaft, the tail seat is hinged to the top seat through a fifth connecting shaft, the first connecting shaft is located between the fifth connecting shaft and is provided with an elastic reset part, and also includes a lock plate swingably arranged in the base, the fourth connecting shaft passes through the lock plate, and a third connecting shaft passes through the lock plate, the two ends of the third connecting shaft are connected to the two second connecting parts of the tail seat, and the third connecting shaft passes through the base and is slidably connected to it.

[0004] In the prior art, the elastic reset member serves as a power source for driving the tailstock to reset, and the reset force thereof is constant, thereby failing to meet the requirements of some users for the chair back support force. Utility Model Content

[0005] In order to solve the problem in the prior art that the reset force used to support the tailstock reset cannot be changed, the purpose of the present invention is to provide a chair and its elastic adjustment mechanism, which can autonomously adjust the reset force of the tailstock, thereby enabling the user to adjust the reset force according to his or her own habits, thereby providing the user with a better user experience.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions: an elastic force adjustment mechanism, including a base for installing a support foot, a tailstock for installing a chair back, and an elastic component for driving the tailstock to reset, the tailstock is hinged to the base, and the elastic component is arranged between the base and the tailstock; it also includes an adjustment component for adjusting the elastic force of the elastic component, and the adjustment component is arranged between the elastic component and the tailstock; the adjustment seat assembly includes a cam and a mounting seat, the cam is rotatably mounted on the mounting seat, the mounting seat is fixed on the tailstock, the cam can be offset against the elastic component, and when the cam rotates, it can push the elastic component to change the elastic force of the elastic component.

[0007] Preferably, the bottom of the mounting seat is hinged to the base, and the mounting seat is fixedly connected to the front end of the tailstock.

[0008] Preferably, a first gear is fixed on the first shaft, the second gear is rotatably mounted on the mounting seat via the second shaft, the first gear and the second gear are meshed for transmission, the cam is rotatably mounted on the mounting seat via the third shaft, a transmission block is also mounted on the third shaft, the transmission block is fixedly connected to the cam, external teeth are raised on the transmission block, and the transmission block is meshed for transmission with the second gear via the external teeth.

[0009] Preferably, the tailstock and the base are hinged via a first hinge shaft, the first shaft is coaxially arranged with the first hinge shaft, and one end of the first shaft passes through the first hinge shaft and is fixedly connected to the handle.

[0010] Preferably, there are two cams, the transmission block is arranged between the two cams, and the transmission block and the cam are fixedly connected by a positioning pin.

[0011] Preferably, the cam pushes the elastic component through the synchronous shaft; a plurality of gear slots are provided on the outer peripheral surface of the cam, and the synchronous shaft is engaged with the gear slots of the cam to achieve positioning.

[0012] Preferably, the elastic component includes two groups of elastic members, which are symmetrically arranged on the left and right, with the front ends of the elastic members abutting against the synchronization shaft and the rear ends of the elastic members abutting against the base.

[0013] Preferably, a roller is mounted on the synchronization shaft, and the elastic member pushes the synchronization shaft so that the roller abuts against the front end of the tailstock.

[0014] Preferably, a first limiting portion is protruded from the synchronization shaft, and the first limiting portion is located between the two cams.

[0015] A chair includes the above-mentioned elastic force adjustment mechanism, wherein the support legs for support are installed under the base, the chair back is installed at the rear of the tail seat, the chair seat is installed on the top seat, and the top seat is installed on the base through a connecting rod.

[0016] The beneficial effects of the technical solution of the present invention are: in the above solution, the elastic force of the elastic component can be conveniently and reliably adjusted through the cam, which is convenient for users to adjust the tilt and reclining reset force of the chair back according to actual needs and usage habits, meet different user needs, and provide users with a better usage experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the chair structure after removing the top seat and connecting rods Figure 1 ;

[0018] Figure 2 Schematic diagram of the chair structure after removing the top seat and connecting rods Figure 2 ;

[0019] Figure 3 Schematic diagram of the chair structure after removing the top seat and connecting rods Figure 3 ;

[0020] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0021] Figure 5 Schematic diagram of the structure of the adjustment component Figure 1 ;

[0022] Figure 6 Schematic diagram of the structure of the adjustment component Figure 2 ;

[0023] Figure 7 Schematic diagram of the chair structure Figure 1 ;

[0024] Figure 8 Schematic diagram of the chair structure Figure 2 .

[0025] Reference numerals: 1, top seat; 2, base; 24, protrusion;

[0026] 3. Tailstock; 31. Side plate; 32. Rear end plate; 33. Front end plate; 35. Limit seat; 351. Sliding hole; 4. Second connecting rod; 41. Third hinge axis; 42. Connecting axis; 43. Fourth hinge axis; 5. First connecting rod; 51. First hinge axis; 52. Second hinge axis;

[0027] 6. Handle; 61. Spring; 611. Guide rod; 612. First connecting seat; 613. Second connecting seat; 62. Mounting seat; 63. First gear; 64. Second gear; 641. Second shaft; 65. Transmission block; 651. External teeth; 652. Second avoidance groove; 653. Third shaft; 654. Positioning pin; 66. Cam; 661. Shift slot; 662. Second limiting portion; 67. Synchronizing shaft; 68. Roller; 69. First shaft. DETAILED DESCRIPTION

[0028] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, unless otherwise specified, "plurality" means two or more, unless expressly limited otherwise.

[0031] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0032] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature. Example

[0033] like Figures 1 to 8 The elastic force adjustment mechanism of a chair shown includes a base 2 for mounting support legs, a tailstock 3 for mounting a chair back, an elastic component for driving the tailstock 3 to return to its original position, and an adjustment component for adjusting the elastic force of the elastic component. The tailstock 3 is hinged to the base 2, and the elastic component is disposed between the base 2 and the tailstock 3.

[0034] The adjusting assembly is arranged between the elastic assembly and the base 2 or between the elastic assembly and the tail stock 3; the adjusting seat assembly includes a cam 66 and a mounting seat 62, the cam 66 is rotatably mounted on the mounting seat 62, the mounting seat 62 is fixed on the tail stock 3, the cam 66 can offset the elastic assembly, and when the cam 66 rotates, it can push the elastic assembly to change the elastic force of the elastic assembly.

[0035] With this arrangement, the restoring force of the chair can be freely adjusted, thereby enabling the chair to adapt to users with different needs.

[0036] In this embodiment, the bottom of the mounting seat is hinged to the base; the tailstock 3 and the base 2 are hinged through the first hinge shaft 51, the mounting seat 62 is installed on the first shaft, and the mounting seat 62 is fixedly connected to the front end of the tailstock 3.

[0037] In this embodiment, a first gear 63 is fixed on the first shaft 69, and the second gear 64 is rotatably mounted on the mounting base 62 via the second shaft 641. The first gear 63 and the second gear 64 are engaged for transmission. The cam 66 is rotatably mounted on the mounting base 62 via the third shaft 653. A transmission block 65 is also mounted on the third shaft 653. The transmission block 65 is fixedly connected to the cam 66. An external tooth 651 is protruded from the transmission block 65, and the transmission block 65 is engaged for transmission with the second gear 64 via the external tooth 651.

[0038] Further preferably, the tailstock 3 is hinged through the base 2 via a first hinge shaft, the first shaft 69 is coaxially arranged with the first hinge shaft, and one end of the first shaft 69 passes through the first hinge shaft and is fixedly connected to the handle 6.

[0039] Further preferably, there are two cams 66 , the transmission block 65 is disposed between the two cams 66 , and the transmission block 65 and the cam 66 are fixedly connected via a positioning pin 654 .

[0040] In this embodiment, the tailstock 3 includes two side panels 31, which are fixedly connected by a front panel 33 and a rear panel 32. The left and right sides of the base 2 are bent upward to form side guards 21, which are arranged between the two side panels 31 and between the front panel 33 and the rear panel 32. The side panels 31 and the side guards 21 are hingedly connected by a first hinge shaft 51, and the mounting base 62 is fixedly connected to the front panel 33. The side panels 31 are covered with exterior panels.

[0041] In this embodiment, a plurality of gear grooves 661 are provided on the outer peripheral surface of the cam 66. When the cam 66 rotates, the synchronization shaft 67 can be engaged with the gear groove 661 of the cam 66, thereby limiting the synchronization shaft 67 and the cam 66. The cam 66 pushes the elastic component through the synchronization shaft 67.

[0042] In this embodiment, a second limiting portion 662 is protruded from the cam 66, and the second limiting portion 662 extends from the bottom of the front end of the tailstock 3. Such an arrangement can limit the rotation range of the cam 66.

[0043] In this embodiment, the elastic assembly includes two groups of elastic members, which are symmetrically arranged on the left and right. Two rollers are rotatably mounted on the synchronous shaft 67. The synchronous shaft 67 is equipped with rollers. There are two groups of elastic members, and two rollers 68 are provided on the synchronous shaft 67. The two groups of elastic members are symmetrically arranged. The two rollers 68 cooperate with the two elastic members respectively. The elastic members push the synchronous shaft to make the rollers abut against the front end of the tailstock. Specifically, the front end of the elastic member is provided with a first avoidance groove and two first clamping grooves, the first avoidance groove is located between the two first clamping grooves and is interconnected, and the rear end of the elastic member is provided with an arc-shaped second clamping groove; the base 2 is provided with an arc-shaped clamping protrusion 24; the rear end of the elastic member is buckled on the clamping protrusion 24 of the base 2 through the second clamping groove, so that the elastic member can rotate relative to the base 2; the roller 68 on the synchronous shaft 67 is inserted into the slot at the front end of the elastic member, and the first clamping groove at the front end of the elastic member buckles the synchronous shaft 67. The elastic member can push the roller 68 to make the roller 68 abut against the front end of the tailstock 3; the cam 66 abuts against the synchronous shaft 67.

[0044] More preferably, a first limiting portion 671 is protruded from the synchronization shaft 67 and is located between the two cams 66. Furthermore, a second avoiding groove 652 for avoiding the first limiting portion 671 is provided on the transmission block 65.

[0045] Further preferably, the elastic member includes a spring 61, a first connecting seat 612 and a second connecting seat 613; the front end of the second connecting seat 613 is protruded with a guide portion, and the rear end of the guide portion is provided with a guide hole, the front end of the first connecting seat 612 is protruded with a guide rod 611, the guide rod 611 is plugged into and slidably fits with the guide hole, the spring 61 is sleeved on the guide portion and the guide rod 611, and the two ends of the spring 61 are respectively against the first connecting seat 612 and the second connecting seat 613; the first card slot and the first avoidance groove are provided at the front end of the second connecting seat 613, and the second card slot is provided at the rear end of the first connecting seat 612.

[0046] In this embodiment, a top seat 1 is further included, the front end of the top seat 1 and the front end of the base 2 are hinged by a first connecting rod 5, the rear end of the top seat 1 and the rear end of the base 2 are hinged by a second connecting rod 4, and the second connecting rod 4 is slidably matched with the tail seat 3.

[0047] Further preferably, the bottom of the first connecting rod 5 is connected to the first hinge shaft 51, the top of the first connecting rod 5 is connected to the top seat 1 through the second hinge shaft 52, the bottom of the second connecting rod 4 is connected to the base 2 through the third hinge shaft 41, the top of the second connecting rod 4 is connected to the top seat 1 through the fourth hinge shaft 43, and the middle position of the second connecting rod 4 is connected to the tail stock 3 through the connecting shaft 42.

[0048] Further preferably, a limit seat 35 is fixed on the side plate of the tailstock 3 , and an inclined sliding hole is provided on the limit seat 35 , and the upper portion of the sliding hole 351 is inclined rearward.

[0049] A chair comprises the elastic force adjustment mechanism, wherein the supporting legs are mounted below the base, the chair back is mounted behind the tail seat, and the chair seat is mounted on the top seat.

[0050] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0051] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. An elastic force adjustment mechanism, comprising a base (2) for mounting a support leg, a tailstock (3) for mounting a chair back, and an elastic component for driving the tailstock (3) to reset, wherein the tailstock (3) is hinged to the base (2), and the elastic component is arranged between the base (2) and the tailstock (3); characterized in that: The invention also includes an adjusting component for adjusting the elastic force of the elastic component, wherein the adjusting component is arranged between the elastic component and the tailstock (3); the adjusting seat component includes a cam (66) and a mounting seat (62), wherein the cam (66) is rotatably mounted on the mounting seat (62), and the mounting seat (62) is fixed on the tailstock (3), and the cam (66) can be offset against the elastic component, and when the cam (66) rotates, it can push the elastic component to change the elastic force of the elastic component.

2. The elastic force adjustment mechanism according to claim 1, characterized in that: The bottom of the mounting seat (62) is hinged to the base (2), and the mounting seat (62) is fixedly connected to the front end of the tailstock (3).

3. The elastic force adjustment mechanism according to claim 2, characterized in that: A first gear (63) is fixed on the first shaft (69), and a second gear (64) is rotatably mounted on the mounting seat (62) via a second shaft (641). The first gear (63) and the second gear (64) are meshed for transmission. The cam (66) is rotatably mounted on the mounting seat (62) via a third shaft (653). A transmission block (65) is also mounted on the third shaft (653). The transmission block (65) is fixedly connected to the cam (66). An external tooth (651) is protruded from the transmission block (65), and the transmission block (65) is meshed with the second gear (64) for transmission via the external tooth (651).

4. The elastic force adjustment mechanism according to claim 3, characterized in that: The tailstock (3) and the base (2) are hinged via a first hinge shaft (51). The first shaft (69) is coaxially arranged with the first hinge shaft (51). One end of the first shaft (69) passes through the first hinge shaft (51) and is fixedly connected to the handle (6).

5. The elastic force adjustment mechanism according to claim 3, characterized in that: There are two cams (66), the transmission block (65) is arranged between the two cams (66), and the transmission block (65) and the cam (66) are fixedly connected via a positioning pin (654).

6. The elastic force adjustment mechanism according to claim 1, characterized in that: The cam (66) pushes the elastic component through the synchronous shaft (67); a plurality of gear slots (661) are provided on the outer peripheral surface of the cam (66); the synchronous shaft (67) and the gear slots (661) of the cam (66) are engaged to achieve position limiting.

7. The elastic force adjustment mechanism according to claim 6, characterized in that: The elastic component includes two groups of elastic members, which are symmetrically arranged on the left and right. The front ends of the elastic members are against the synchronous shaft (67), and the rear ends of the elastic members are against the base (2).

8. The elastic force adjustment mechanism according to claim 7, characterized in that: A roller (68) is mounted on the synchronous shaft (67), and the elastic member pushes the synchronous shaft (67) to cause the roller (68) to abut against the front end of the tailstock (3).

9. The elastic force adjustment mechanism according to claim 7, characterized in that: A first limiting portion (671) is protruded from the synchronization shaft (67), and the first limiting portion (671) is located between the two cams (66).

10. A chair, characterized in that: The invention comprises an elastic force adjustment mechanism as described in any one of claims 1 to 9, wherein the support legs for supporting are installed under the base (2), the backrest is installed at the rear of the tail seat (3), the seat is installed on the top seat (1), and the top seat (1) is installed on the base (2) through a connecting rod.

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