Adjustable chair back structure applied to office chair

Abstract

An adjustable chair back structure applied to an office chair comprises a chair back frame and a deformable rubber back frame, the rubber back frame is located on the front side of the chair back frame, and the rubber back frame is bent forwards and arched; the upper part of the rubber back frame is connected with the upper part of the chair back frame, and the lower part is connected with the chair back frame through a telescopic supporting assembly; the telescopic supporting assembly comprises a first supporting arm and a second supporting arm, and the lower end of the first supporting arm is hinged to the chair back frame; the upper end of the second supporting arm is hinged to the rubber back frame, the lower end of the second supporting arm is in sliding connection with the upper end of the first supporting arm, and the rubber back frame is configured to change the bending degree of the rubber back frame through sliding of the second supporting arm relative to the first supporting arm; and a position locking structure matched with the first support arm to lock the position of the second support arm is arranged on the second support arm. The bending degree of the rubber back frame can be changed to support users of different body types, so that the requirements of the users of different body types on different supporting effects of the chair back are met, and the use experience of the users is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of office chairs, in particular to an adjustable chair back structure used on an office chair. Background Art

[0002] Office chairs broadly refer to all chairs used in offices, which are indispensable items in today's offices.

[0003] Existing office chairs generally have backrests on the seats. Existing backrest structures are often fixed on the backrests and can only be adjusted up and down in a simpler manner. The curvature of the backrests is often not adjustable. However, different users have different body shapes. The curvature of the backrests on the same office chair is difficult to adapt to users of different body shapes, resulting in a lack of comfort for users sitting on the office chairs. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides an adjustable chair back structure applied to an office chair.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] An adjustable chair back structure used in an office chair comprises a chair back frame and a deformable rubber back frame, wherein the rubber back frame is located in front of the chair back frame and is bent and arched forward; the characteristics are:

[0007] The upper part of the rubber back frame is connected to the upper part of the chair back frame, and the lower part is connected to the chair back frame by a telescopic support assembly;

[0008] The telescopic support assembly comprises a first support arm and a second support arm, wherein the lower end of the first support arm is hinged to the chair back frame;

[0009] The upper end of the second arm is hinged to the adhesive back frame, and the lower end is slidably connected to the upper end of the first arm. The adhesive back frame is configured to change the bending degree of the adhesive back frame by sliding the second arm relative to the first arm; the second arm is provided with a position locking structure that cooperates with the first arm to lock the position of the second arm.

[0010] In the utility model, a plurality of locking grooves are arranged on the first arm along the extension direction of the second arm, and the position locking structure includes a locking member and a locking spring. The middle part of the locking member is hinged on the second arm, and one end of the locking member is provided with a locking tooth portion for inserting into at least one locking groove to lock the position of the second arm, and the other end is provided with a handle portion for a user to operate and rotate the locking member to disengage the locking tooth portion from the locking groove;

[0011] Both ends of the locking spring are in contact with the locking member and the second arm respectively, and the locking spring is configured to keep the locking tooth portion inserted into the locking groove when no operation is performed by the user.

[0012] In the utility model, a first positioning structure for positioning and installing one end of the locking spring is provided on the outer wall of the second arm, and a second positioning structure for positioning and installing the other end of the locking spring is provided on the locking member.

[0013] In the utility model, an escape groove is provided on the outer wall of the first support arm, and the locking groove is arranged in the escape groove.

[0014] In the utility model, the second support arm is provided with a telescopic accommodating groove with an opening at the lower end, and the first support arm is slidably fitted in the telescopic accommodating groove.

[0015] In the utility model, the locking groove includes a telescopic limit surface for cooperating with the locking tooth to limit the downward movement of the second arm, and a guide surface for guiding the locking tooth to move and slide away from the locking groove when the user pulls the rubber back frame upward, wherein the telescopic limit surface is horizontally arranged, the guide surface extends upward at an angle, the guide surface is located above the telescopic limit surface, and the lower end of the guide surface is connected to the inner end of the telescopic limit surface.

[0016] In the utility model, the adhesive back frame includes a bottom body and an integrally formed side body connected to the left and right sides of the bottom body. The side body includes a front arch portion connected to the bottom body at the lower end, a deformation extension portion connected to the upper end of the front arch portion at the lower end, and an adhesive back connection portion connected to the upper end of the deformation extension portion at the lower end. The deformation extension portion is provided with a plurality of deformation gap grooves for facilitating its bending and deformation.

[0017] In the utility model, two end matching grooves for connecting to the rubber back frame are provided on the upper front side of the chair back frame, and the two rubber back connecting parts of the rubber back frame are respectively matched in the two end matching grooves, and the rubber back connecting part and the chair back frame are fixedly connected by a second screw.

[0018] In the utility model, the adhesive back connection part is provided with a mating inserting part which extends upward and bulges, and the end mating groove is provided with a mating slot, and the mating inserting part is inserted and mated in the mating slot.

[0019] In the utility model, there are two telescopic support components and they are arranged symmetrically on the left and right.

[0020] The beneficial effects of the utility model are as follows: the utility model connects the lower part of the rubber back frame with the chair back frame by adopting a telescopic support assembly, wherein the telescopic support assembly includes a first arm hinged to the chair back frame at the lower end and a second arm hinged to the rubber back frame at the upper end, the lower end of the second arm is slidably connected to the upper end of the first arm, and the rubber back frame changes the bending degree of the rubber back frame by sliding the second arm relative to the first arm, so that the rubber back frame can support users of different body shapes by changing its bending degree, thereby meeting the needs of users of different body shapes for different support effects of the chair back and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0022] Figure 1 The three-dimensional Figure 1 ;

[0023] Figure 2 Sectional view of the telescopic support assembly after installation Figure 1 ;

[0024] Figure 3 Sectional view of the telescopic support assembly after installation Figure 2 ;

[0025] Figure 4 is a cross-sectional view of the first arm;

[0026] Figure 5 It is a schematic diagram of the combination of two telescopic support components and a rubber back frame;

[0027] Figure 6 The three-dimensional Figure 2 ;

[0028] Figure 7 It is a right side view of this embodiment. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0030] Reference Figure 1-7 An adjustable chair back structure used in an office chair includes a chair back frame 1 and a deformable rubber back frame 2, wherein a seat connecting portion for connecting a seat is provided at the lower portion of the chair back frame 1, so as to facilitate installation of the chair back frame 1 on the seat of the office chair; the rubber back frame 2 is located at the front side of the chair back frame 1, the rubber back frame 2 is bent and arched forward, and the rubber back frame 2 is used to install a mesh.

[0031] Furthermore, the upper part of the rubber back frame 2 is connected to the upper part of the chair back frame 1, and the lower part is connected to the chair back frame 1 by a telescopic support assembly 10; the telescopic support assembly 10 includes a first arm 3 and a second arm 4, the lower end of the first arm 3 is hinged to the chair back frame 1; the upper end of the second arm 4 is hinged to the rubber back frame 2, and the lower end is slidably connected to the upper end of the first arm 3, and the rubber back frame 2 is configured to change the bending degree of the rubber back frame 2 by sliding the second arm 4 relative to the first arm 3; the second arm 4 is provided with a position locking structure that cooperates with the first arm 3 to lock the position of the second arm 4.

[0032] In this embodiment, the lower part of the rubber back frame 2 is connected to the chair back frame 1 by using a telescopic support assembly 10, wherein the telescopic support assembly 10 includes a first arm 3 whose lower end is hinged to the chair back frame 1 and a second arm 4 whose upper end is hinged to the rubber back frame 2, wherein the lower end of the second arm 4 is slidably connected to the upper end of the first arm 3, and the rubber back frame 2 changes the bending degree of the rubber back frame 2 by sliding the second arm 4 relative to the first arm 3, so that the rubber back frame 2 can support users of different body shapes by changing its bending degree, thereby meeting the needs of users of different body shapes for different support effects on the backrest and improving the user experience. In addition, since the first arm 3 and the chair back frame 1, and the rubber back frame 2 and the second arm 4 are all hinged, the first arm 3 and the second arm 4 can swing at different angles according to the different bending degrees of the rubber back frame 2, so that the process of adjusting the bending degree of the rubber back frame 2 is smoother.

[0033] The first arm 3 and the second arm 4 are respectively connected to the upper and lower ends of the back of the chair back, and then the length of the sliding rod of the first arm 3 in the telescopic receiving groove 41 in the second arm 4 is adjusted through the position locking structure. The curvature of the chair back is adjusted by tightening the upper and lower ends of the chair back toward the middle, thereby meeting the needs of different users for the arch of the chair back, and being able to better support different users and obtain a better user experience.

[0034] As a preferred embodiment, a plurality of locking grooves 31 are provided on the first arm 3 and are arranged along the extension and retraction direction of the second arm 4. The position locking structure includes a locking piece 5 and a locking spring 6. The middle portion of the locking piece 5 is hinged on the second arm 4. One end of the locking piece 5 is provided with a locking tooth portion 51 for inserting into at least one locking groove 31 to lock the position of the second arm 4, and the other end is provided with a handle portion 52 for a user to operate and rotate the locking piece 5 to disengage the locking tooth portion 51 from the locking groove 31; the two ends of the locking spring 6 are respectively in contact with the locking piece 5 and the second arm 4, and the locking spring 6 is configured to keep the locking tooth portion 51 inserted in the locking groove 31 when the user does not operate.

[0035] The user can use the lever portion 52 to control the rotation of the locking piece 5 so that the locking tooth portion 51 disengages from the locking groove 31. At this time, the locking spring 6 is in a compressed state; then the adhesive back frame 2 is pulled up or down to make the second arm 4 slide relative to the first arm 3, thereby changing the bending degree of the adhesive back frame 2; when the user releases the lever portion 52 and the adhesive back frame 2, the locking spring 6 expands and drives the locking tooth portion 51 to cooperate with the corresponding locking groove 31, completing the locking of the position of the second arm 4, thereby fixing the current bending degree of the adhesive back frame 2 and improving the user experience.

[0036] As a preferred embodiment, there are two telescopic support assemblies 10 and they are arranged symmetrically on both sides. The two telescopic support assemblies 10 support the installation stability of the bottom of the adhesive back frame 2 at both ends.

[0037] As a limited implementation method, an avoidance groove 32 is provided on the outer wall of the first arm 3, and the locking groove 31 is provided in the avoidance groove 32. By providing the locking groove 31 in the avoidance groove 32, the activity space of the locking tooth portion 51 is increased, and the locking tooth portion 51 can directly complete the action of disengaging from the locking groove 31 in the avoidance groove 32.

[0038] As a preferred embodiment, the second arm 4 is provided with a telescopic receiving groove 41 with an opening at the lower end, and the first arm 3 is slidably fitted in the telescopic receiving groove 41, thereby realizing a sliding connection between the first arm 3 and the second arm 4. In addition, in this embodiment, the cross-sectional shapes of the telescopic receiving groove 41 and the first arm 3 are both elliptical, thereby limiting the relative circumferential rotation between the first arm 3 and the second arm 4, thereby improving the use stability of the telescopic support assembly 10.

[0039] As a preferred embodiment, the locking member 5 is provided with a locking installation shaft 7, and the locking member 5 is hinged to the outer side of the second arm 4 through the locking installation shaft 7. For example, the outer side of the second arm 4 is provided with two arm hinge parts 42, and the arm hinge parts 42 are provided with arm hinge holes, and the locking member 5 is provided with a locking hinge part extending between the two arm hinge parts 42, and the locking hinge part is provided with a locking hinge hole corresponding to the arm hinge hole, and the locking installation shaft 7 is matched in the locking hinge hole and the arm hinge hole, so as to achieve the purpose of hingedly connecting the locking member 5 to the second arm 4.

[0040] As a preferred embodiment, the locking spring 6 is located above the locking installation shaft 7, a first positioning structure for positioning and installing one end of the locking spring 6 is provided on the outer wall of the second arm 4, and a second positioning structure for positioning and installing the other end of the locking spring 6 is provided on the locking member 5, and the installation stability of the locking spring 6 can be improved by the first positioning structure and the second positioning structure. In this embodiment, the locking spring 6 adopts a compression spring, the first positioning structure is a spring slot provided on the outer wall of the second arm 4, and one end of the locking spring 6 is inserted into the spring slot; the second positioning structure is a spring protrusion 53 provided on the outer wall of the locking member 5, and the spring protrusion 53 is inserted from the other end of the locking spring 6 into the inner cavity of the locking spring 6, thereby completing the positioning and installation of the locking spring 6.

[0041] As a preferred embodiment, the adhesive back frame 2 is provided with an adhesive back hinge seat 20, the chair back frame 1 is provided with a back frame hinge seat 8, each of the telescopic support components 10 corresponds to one adhesive back hinge seat 20 and a back frame hinge seat 8, the lower end of the first support arm 3 is provided with a first hinge portion 30 hinged to the back frame hinge seat 8 by a first hinge axis; the upper end of the second support arm 4 is provided with a second hinge portion 43 hinged to the adhesive back hinge seat 20 by a second hinge axis. The first hinge seat and the second hinge axis are not shown in the drawings.

[0042] In this embodiment, each of the adhesive back hinge seats 20 is formed by two adhesive back hinge parts 201 integrally formed from left to right and connected to the rear side of the lower part of the adhesive back frame 2, and the second hinge part 43 is hinged between the two adhesive back hinge parts 201 using a second hinge axis, thereby realizing the articulation between the second support arm 4 and the adhesive back frame 2.

[0043] In this embodiment, the back frame articulated seat 8 is installed on the chair back frame 1 by using fixing screws. For example, the chair back frame 1 is provided with a hinge positioning groove 11. The back frame articulated seat 8 includes a bottom connecting portion 81, and two back frame articulated portions 82 integrally formed at the bottom connecting portion. The bottom connecting portion 81 is engaged in the articulated positioning groove 11 and fixed by using fixing screws to complete the positioning and installation of the back frame articulated seat 8 on the chair back frame 1; the first articulated portion 30 is articulated between the two back frame articulated portions 82 by using a first articulated axis to realize the articulation between the first support arm 3 and the chair back frame 1.

[0044] As a preferred embodiment, the locking groove 31 includes a telescopic limit surface 311 for cooperating with the locking tooth portion 51 to limit the downward movement of the second arm 4, and a guide surface 312 for guiding the locking tooth portion 51 to move and slide away from the locking groove 31 when the user pulls the rubber back frame 2 upward, wherein the telescopic limit surface 311 is horizontally arranged, and the guide surface 312 extends upward at an angle, and the guide surface 312 is located above the telescopic limit surface 311, and the lower end of the guide surface 312 is connected to the inner end of the telescopic limit surface 311. Through the above structure, when the user pulls up the rubber back frame 2 to adjust the degree of bending, the locking tooth portion 51 can be slid on the guide surface 312, and the guide surface 312 can guide the locking tooth portion 51 to move and slide away from the locking groove 31, and the locking spring 6 can be converted into a compressed state. Then, when the locking tooth portion 51 slides to the next locking groove 31, the locking spring 6 can be expanded to make the locking tooth portion 51 fit in the locking groove 31. Therefore, when the user pulls up the rubber back frame 2 to adjust the degree of bending, the user does not need to operate the locking piece 5 to unlock it, thereby improving the convenience of the user in adjusting the degree of bending during this process.

[0045] As a preferred embodiment, the adhesive back frame 2 includes a bottom body 21, an integrally formed side body connected to the left and right sides of the bottom body 21, the side body includes a front arch 22 connected to the bottom body 21 at the lower end, a deformable extension 23 connected to the upper end of the front arch 22 at the lower end, and an adhesive back connection 24 connected to the upper end of the deformable extension 23 at the lower end, the middle part of the front arch 22 is bent forward and arched, and the deformable extension 23 is provided with a plurality of deformation gap grooves 25 for facilitating its bending and deformation. The deformable extension 23 is easily bent and deformed under the action of the deformation gap grooves 25, so that when the user adjusts the bending degree of the adhesive back frame 2, the deformable extension 23 is easily deformed to meet the adjustment needs, and will not generate too much force on the adhesive back connection 24, reducing the probability of the adhesive back connection 24 detaching from the chair back frame 1, and ensuring the installation stability of the adhesive back frame 2.

[0046] As a preferred embodiment, the upper front side of the seat back frame 1 is provided with two end fitting grooves 12 for connecting the adhesive back frame 2, and the two adhesive back connecting parts 24 of the adhesive back frame 2 are respectively fitted in the two end fitting grooves 12, and the adhesive back connecting part 24 is fixedly connected to the seat back frame 1 by a second screw. Further, in order to improve the installation stability of the adhesive back frame 2, the adhesive back connecting part 24 is provided with a fitting insert 26 extending upward, and the end fitting groove 12 is provided with a fitting slot 13, and the fitting insert 26 is inserted and fitted in the fitting slot 13, thereby improving the installation stability of the adhesive back frame 2, making it difficult to separate forward from the seat back frame 1.

[0047] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by substantially the same means shall fall within the protection scope of the present invention.

Claims

1. An adjustable chair back structure used in an office chair, comprising a chair back frame (1) and a rubber back frame (2), wherein the rubber back frame (2) is located in front of the chair back frame (1), and the rubber back frame (2) is bent and arched forward; the characteristics are: The upper part of the rubber back frame (2) is connected to the upper part of the chair back frame (1), and the lower part is connected to the chair back frame (1) by using a telescopic support assembly (10); The telescopic support assembly (10) comprises a first support arm (3) and a second support arm (4); the lower end of the first support arm (3) is hinged to the chair back frame (1); The upper end of the second support arm (4) is hinged to the adhesive back frame (2), and the lower end is slidably connected to the upper end of the first support arm (3); the adhesive back frame (2) is configured to change the bending degree of the adhesive back frame (2) by sliding the second support arm (4) relative to the first support arm (3); and the second support arm (4) is provided with a position locking structure that cooperates with the first support arm (3) to lock the position of the second support arm (4).

2. The adjustable chair back structure used in an office chair according to claim 1, characterized in that: The first arm (3) is provided with a plurality of locking grooves (31) arranged along the extension and retraction direction of the second arm (4); the position locking structure comprises a locking member (5) and a locking spring (6); the middle portion of the locking member (5) is hinged on the second arm (4); one end of the locking member (5) is provided with a locking tooth portion (51) for inserting into at least one locking groove (31) to lock the position of the second arm (4); the other end of the locking member (5) is provided with a handle portion (52) for a user to operate and rotate the locking member (5) to disengage the locking tooth portion (51) from the locking groove (31); Both ends of the locking spring (6) are in contact with the locking member (5) and the second arm (4) respectively, and the locking spring (6) is configured to keep the locking tooth portion (51) inserted into the locking groove (31) when no operation is performed by the user.

3. The adjustable chair back structure used in an office chair according to claim 2, characterized in that: A first positioning structure for positioning and installing one end of a locking spring (6) is provided on the outer wall of the second support arm (4), and a second positioning structure for positioning and installing the other end of the locking spring (6) is provided on the locking member (5).

4. The adjustable chair back structure used in an office chair according to claim 2, characterized in that: An escape groove (32) is provided on the outer wall of the first support arm (3), and the locking groove (31) is arranged in the escape groove (32).

5. An adjustable chair back structure used in an office chair according to any one of claims 1 to 4, characterized in that: The second support arm (4) is provided with a telescopic accommodating groove (41) with an opening at the lower end, and the first support arm (3) is slidably fitted in the telescopic accommodating groove (41).

6. An adjustable chair back structure used in an office chair according to any one of claims 2 to 4, characterized in that: The locking groove (31) comprises a telescopic limit surface (311) for cooperating with the locking tooth portion (51) to limit the downward movement of the second support arm (4), and a guide surface (312) for guiding the locking tooth portion (51) to move and slide away from the locking groove (31) when the user pulls the rubber back frame (2) upward, wherein the telescopic limit surface (311) is arranged horizontally, and the guide surface (312) extends upward at an angle, and the guide surface (312) is located above the telescopic limit surface (311), and the lower end of the guide surface (312) is connected to the inner end of the telescopic limit surface (311).

7. An adjustable chair back structure used in an office chair according to any one of claims 1 to 4, characterized in that: The adhesive back frame (2) comprises a bottom body (21), and an integrally formed side body connected to the left and right sides of the bottom body (21); the side body comprises a front arch (22) whose lower end is connected to the bottom body (21), a deformable extension (23) whose lower end is connected to the upper end of the front arch (22), and an adhesive back connection part (24) whose lower end is connected to the upper end of the deformable extension (23); and the deformable extension (23) is provided with a plurality of deformation gap grooves (25) for facilitating its bending and deformation.

8. The adjustable chair back structure used in an office chair according to claim 7, characterized in that: The upper front side of the chair back frame (1) is provided with two end fitting grooves (12) for connecting to the adhesive back frame (2); the two adhesive back connecting parts (24) of the adhesive back frame (2) are respectively fitted in the two end fitting grooves (12); the adhesive back connecting parts (24) and the chair back frame (1) are fixedly connected by a second screw.

9. The adjustable chair back structure used in an office chair according to claim 8, characterized in that: The adhesive back connection portion (24) is provided with a mating insert portion (26) that protrudes upwardly, and the end mating groove (12) is provided with a mating slot (13), and the mating insert portion (26) is inserted and mated in the mating slot (13).

10. An adjustable chair back structure used in an office chair according to any one of claims 1 to 4, characterized in that: There are two telescopic support assemblies (10) which are arranged in a bilaterally symmetrical manner.

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