Chair frame with seat backrest lifting adjusting structure

Abstract

The utility model discloses a seat frame with a seat backrest lifting adjusting structure, which belongs to the technical field of seat structures, and comprises a seat underframe, a corner swing arm, a backrest support and a side leaning support, a rear extension arm used for connecting the corner swing arm is arranged on the rear side of the seat underframe, the rear extension arm is rotatably connected with one end of the corner swing arm, and the other end of the corner swing arm is rotatably connected with the backrest support. The other end of the corner swing arm is connected with the backrest bracket; side extension arms used for being connected with the side leaning supports are arranged on the left side and the right side of the seat bottom frame, and the side extension arms are rotationally connected with the side leaning supports; when the seat backrest is subjected to lifting adjustment, the backrest support can be subjected to sliding lifting adjustment in the length direction of the vertical arm only by separating the lifting adjustment switch from the lifting adjustment hole, and the isolation sleeve is arranged between the backrest support and the vertical arm, so that the backrest support and the vertical arm do not make direct contact when sliding up and down relative to the vertical arm; the friction force between the isolation sleeve and the backrest support is small, so that the backrest support slides more smoothly, and the generated noise is small.

Description

Technical Field

[0001] The utility model belongs to the technical field of seat structures, and in particular relates to a chair frame with a seat back lifting and lowering adjustment structure. Background Art

[0002] In order to adapt to different usage requirements, a new type of multifunctional chair has appeared on the market. As shown in the Chinese patent document with patent application number 202120150116.9, the backrest and the seat are connected by a second adjustment component. The second adjustment component includes a first adjustment component that cooperates with the corner plate for height adjustment. A backrest adjustment handle for controlling the backrest for height adjustment is provided in the first adjustment component. A plurality of adjustment holes are provided in the corner plate. A height limiting column that can enter the adjustment hole for locking is provided in the first adjustment component. When adjusting the height of the backrest, the backrest adjustment handle is pulled out to make the height limiting column escape from the adjustment hole. After the backrest is moved up and down to the required height, the backrest adjustment handle is released to make the height limiting column enter the corresponding adjustment hole for locking. The height lifting and lowering adjustment structure of the backrest is relatively simple and convenient to operate. However, during the backrest height adjustment process, the contact between the corner plate and the first adjustment component is metal surface contact. The friction between them when sliding is large, which will produce a harsh sound and affect the adjustment use. At the same time, the support force of the entire backrest supported by the seat corner board is poor. When the user leans on the backrest with a large force, it is easy to cause the corner board to deform or even break. Utility Model Content

[0003] In order to overcome the deficiencies of the prior art, the utility model provides a chair frame with a seat back lifting and adjusting structure.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A chair frame with a seat back lifting and adjusting structure, comprising a seat bottom frame, a corner swing arm, a backrest bracket and a side support bracket, wherein a rear extension arm for connecting the corner swing arm is provided at the rear side of the seat bottom frame, the rear extension arm is rotatably connected to one end of the corner swing arm, and the other end of the corner swing arm is connected to the backrest bracket; side extension arms for connecting the side support bracket are provided on the left and right sides of the seat bottom frame, and the side extension arms are rotatably connected to the side support bracket; the corner swing arm comprises a horizontal arm for rotatably connecting to the rear extension arm and a vertical arm for connecting to the backrest bracket, An insertion cavity is provided inside the bracket for the vertical arm to be inserted and connected, a plurality of lifting adjustment holes are arranged at intervals up and down are provided on the rear side of the vertical arm, a lifting adjustment switch is provided on the rear side of the backrest bracket for controlling the lifting adjustment of the backrest bracket, the lifting adjustment switch can be extended into the lifting adjustment hole to lock the backrest bracket and the vertical arm relative to each other, an isolation sleeve is provided on the inner side of the insertion cavity, the isolation sleeve is made of plastic, the isolation sleeve is arranged between the backrest bracket and the vertical arm, and a through groove is provided on the rear side of the isolation sleeve for the lifting adjustment switch to pass through and enter the lifting adjustment hole for cooperation.

[0006] In the utility model, the lifting and lowering adjustment switch includes a rotating handle, a movable column, a compression spring and a locking head. The rotating handle is rotatably connected to one end of the movable column, the compression spring is sleeved on the outside of the movable column, and the locking head is connected to the other end of the movable column. The rotating handle is located on the rear side of the backrest bracket, and the movable column extends into the insertion cavity from the rear side of the backrest bracket. The two ends of the compression spring respectively abut against the inner side wall of the insertion cavity and the end face of the locking head.

[0007] In the utility model, a protrusion is provided on the side of the rotating handle facing the backrest bracket. When the rotating handle rotates relative to the movable column, the movable column and the locking head are moved backward due to the abutment between the protrusion and the rear side of the backrest bracket, and the compression spring is compressed.

[0008] In the utility model, a plurality of isolating ridges are arranged on the inner side of the isolating sleeve, the isolating ridges extend along the length direction of the isolating sleeve, and the plurality of isolating ridges are arranged at intervals along the circumference of the isolating sleeve.

[0009] In the present invention, the chair frame also includes a backrest swing arm, which is rotatably connected to the backrest bracket, and the backrest swing arm is provided with a first adjustment switch for controlling the adjustment of the flipping angle of the backrest swing arm relative to the backrest bracket, and the backrest bracket is provided with a first telescopic rod for cooperating with the backrest swing arm to implement position adjustment and locking when the flipping angle is adjusted relative to the backrest bracket, the first telescopic rod is provided with a first telescopic switch for controlling its telescopic action switch, and the first adjustment switch is connected to the first telescopic switch of the first telescopic rod through a first pull wire; the first telescopic rod is rotatably connected to the backrest swing arm, the first telescopic rod rotates with the backrest swing arm based on a first rotation axis, and the backrest swing arm rotates with the backrest bracket based on a second rotation axis, and the first rotation axis and the second rotation axis are parallel lines that do not overlap with each other.

[0010] In the utility model, a second telescopic rod is provided in the side leaning bracket, a second adjusting switch is provided on the side leaning bracket, the second telescopic rod is provided with a second telescopic switch, the second adjusting switch is connected to the second telescopic switch of the second telescopic rod, and the second telescopic rod is rotatably connected to the side extension arm; the second telescopic rod and the side extension arm rotate based on a third rotation axis, and the side leaning bracket and the side extension arm rotate based on a fourth rotation axis, the third rotation axis and the fourth rotation axis are parallel lines that do not overlap with each other, and the side leaning bracket realizes flipping adjustment relative to the side extension arm based on the telescopic action of the second telescopic rod.

[0011] In the utility model, a third adjustment switch is provided on the seat frame, a third telescopic rod and a sliding mounting frame are provided in the seat frame, the sliding mounting frame is movably installed in the seat frame, one end of the sliding mounting frame is connected to one end of the third telescopic rod, the other end of the sliding mounting frame is rotatably connected to the cross arm, the other end of the third telescopic rod is fixed on the seat frame, the sliding mounting frame and the cross arm rotate based on a fifth rotation axis, the cross arm and the seat frame rotate based on a sixth rotation axis, the fifth rotation axis and the sixth rotation axis are parallel lines that do not overlap with each other, and the angle swing arm is based on the forward and backward sliding of the sliding mounting frame and the telescopic action of the third telescopic rod to rotate and adjust relative to the seat frame.

[0012] In the utility model, one end of the third telescopic rod fixedly connected to the seat frame is provided with a third telescopic switch, and the third adjustment switch is connected to the third telescopic switch.

[0013] The beneficial effects of the present invention are as follows: when the seat back of the present invention is to be raised and lowered, the backrest bracket can be slid and raised along the length direction of the vertical arm by only using the lifting adjustment switch to disengage the lifting adjustment hole. After adjusting to the required height, the backrest bracket can be locked by using the lifting adjustment switch to make it enter the lifting adjustment hole. During the lifting and lowering adjustment process of the backrest, an isolation sleeve is provided between the backrest bracket and the vertical arm so that when the backrest bracket slides up and down relative to the vertical arm, the two do not have direct contact, the friction between the isolation sleeve and the two is small, the backrest bracket slides more smoothly, and the noise generated is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of the chair frame of this embodiment in one viewing direction;

[0015] Figure 2 It is a schematic diagram of the overall structure of the chair frame of this embodiment in another viewing direction;

[0016] Figure 3 Schematic diagram of the structure of the corner swing arm of this embodiment;

[0017] Figure 4 This is a schematic diagram of the structure of the backrest bracket of this embodiment;

[0018] Figure 5 This is a schematic diagram of the structure of the isolation sleeve of this embodiment;

[0019] Figure 6 This is a schematic diagram of the structure of the lifting and lowering adjustment switch of this embodiment;

[0020] Figure 7 This is a schematic diagram of the connection structure between the backrest swing arm and the backrest bracket of this embodiment;

[0021] Figure 8 Schematic diagram of the adjustment structure of the backrest swing arm of this embodiment;

[0022] Fig. 9 This is a schematic diagram of the adjustment structure of the side support bracket of this embodiment;

[0023] Fig.10 Schematic diagram of the inclination adjustment structure of the corner swing arm in this embodiment. DETAILED DESCRIPTION

[0024] 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.

[0025] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] In addition, if there are descriptions involving "first" or "second" etc. in the embodiments of the utility model, the descriptions of "first" or "second" etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0027] like Figures 1 to 10As shown, this embodiment discloses a chair frame with a seat back lifting and adjusting structure, including a seat base frame 1, a corner swing arm 2, a backrest bracket 3 and a side support bracket 4, the rear side of the seat base frame 1 is provided with a rear extension arm 11 for connecting the corner swing arm 2, the rear extension arm 11 is rotatably connected to one end of the corner swing arm 2, and the other end of the corner swing arm 2 is connected to the backrest bracket 3; the left and right sides of the seat base frame 1 are provided with side extension arms 12 for connecting the side support bracket 4, the side extension arm 12 is rotatably connected to the side support bracket 4; the corner swing arm 2 includes a horizontal arm 21 for rotatably connecting to the rear extension arm 11 and a vertical arm 22 for connecting to the backrest bracket 3, the backrest bracket An insertion cavity 31 is provided inside the frame 3 for the vertical arm 22 to be inserted and connected, and a plurality of lifting adjustment holes 221 are arranged in an upper and lower interval arrangement on the rear side of the vertical arm 22. A lifting adjustment switch 5 for controlling the lifting adjustment of the backrest bracket 3 is provided on the rear side of the backrest bracket 3. The lifting adjustment switch 5 can be extended into the lifting adjustment hole 221 to relatively lock the backrest bracket 3 and the vertical arm 22. An isolation sleeve 32 is provided on the inner side of the insertion cavity 31. The isolation sleeve 32 is made of plastic and is arranged between the backrest bracket 3 and the vertical arm 22. A through groove 33 is provided on the rear side of the isolation sleeve 32 for the lifting adjustment switch 5 to pass through and enter the lifting adjustment hole 221 for matching. When the seat back of the present embodiment is to be raised and lowered, it is only necessary to use the lifting adjustment switch 5 to disengage the lifting adjustment hole 221, and the backrest bracket 3 can be slid and raised along the length direction of the vertical arm 22. After adjusting to the required height, the backrest bracket 3 can be locked by making it enter the lifting adjustment hole 221 through the lifting adjustment switch 5. During the lifting and lowering adjustment process of the backrest, an isolation sleeve 32 is provided between the backrest bracket 3 and the vertical arm 22, so that when the backrest bracket 3 slides up and down relative to the vertical arm 22, the two do not have direct contact, and the friction between the isolation sleeve 32 and the two is small, so the backrest bracket 3 slides more smoothly and generates less noise.

[0028] In this embodiment, the lifting and lowering adjustment switch 5 includes a rotating handle 51, a movable column 52, a compression spring 53 and a locking head 54. The rotating handle 51 is rotatably connected to one end of the movable column 52, the compression spring 53 is sleeved on the outer side of the movable column 52, and the locking head 54 is connected to the other end of the movable column 52. The rotating handle 51 is located at the rear side of the backrest bracket 3, and the movable column 52 extends into the insertion cavity 31 from the rear side of the backrest bracket 3. The two ends of the compression spring 53 respectively abut against the inner side wall of the insertion cavity 31 and the end face of the locking head 54; a protrusion 55 is provided on the side of the rotating handle 51 facing the backrest bracket 3. When the rotating handle 51 rotates relative to the movable column 52, the movable column 52 and the locking head 54 are moved to the rear side based on the abutment of the protrusion 55 with the rear side of the backrest bracket 3, and the compression spring 53 is compressed. Under the elastic force of the compression spring 53, the locking head 54 always has the force to extend in the direction of the lifting adjustment hole 221, so the lifting adjustment switch 5 is always in a tight state, preventing the lifting adjustment switch 5 from loosening and disengaging from the lifting adjustment hole 221, and also preventing the lifting adjustment switch 5 from shaking and producing abnormal noise. When the locking head 54 needs to be disengaged from the lifting adjustment hole 221, the rotating handle 51 is rotated to a direction parallel to the central axis of the movable column 52. At this time, the protrusion 55 abuts against the rear side of the backrest bracket 3, and the rotating handle 51 is away from the backrest bracket 3, so the movable column 52 and the locking head 54 are pulled backward, the compression spring 53 is further compressed, and the elastic force direction of the compression spring 53 is opposite to the supporting force direction of the rotating handle 51, so the rotating handle 51 can remain stopped in this state. When the locking head 54 needs to enter the lifting adjustment hole 221, the rotating handle 51 is rotated to a direction perpendicular to the central axis of the movable column 52. At this time, the side of the rotating handle 51 abuts against the rear side of the backrest bracket 3, the protrusion 55 is separated from the backrest bracket 3, and the rotating handle 51 moves closer to the backrest bracket 3, so the movable column 52 and the locking head 54 move in the direction of entering the lifting adjustment hole 221, and the compression spring 53 is reset. At this time, the elastic force direction of the compression spring 53 is also opposite to the supporting force direction of the rotating handle 51, so the rotating handle 51 can remain stopped in this state. When the rotating handle 51 is rotated to a state where the central axis of the movable column 52 is between parallel and perpendicular, the elastic force direction of the compression spring 53 and the supporting force direction of the rotating handle 51 are not on the same straight line. Under the elastic force of the compression spring 53, the rotating handle 51 automatically resets to a state where the locking head 54 enters the lifting adjustment hole 221.

[0029] In this embodiment, in order to reduce the contact area between the vertical arm 22 and the isolation sleeve 32 and reduce the friction force when the two slide relative to each other, a plurality of isolation ridges 34 are provided on the inner side of the isolation sleeve 32. The isolation ridges 34 extend along the length direction of the isolation sleeve 32. The plurality of isolation ridges 34 are arranged at intervals along the circumference of the isolation sleeve 32. At this time, when the backrest bracket 3 is adjusted for lifting and sliding, the friction force is smaller and the adjustment is smoother.

[0030] In the present embodiment, the chair frame further comprises a backrest swing arm 6, which is rotatably connected to the backrest bracket 3, and a first adjusting switch 7 for controlling the tilting angle adjustment of the backrest swing arm 6 relative to the backrest bracket 3 is provided on the backrest swing arm 6, and a first telescopic rod 8 for cooperating with the backrest swing arm 6 to adjust the tilting angle relative to the backrest bracket 3 is provided in the backrest bracket 3, and the first telescopic rod 8 is provided with a first telescopic switch 81 for controlling the telescopic action switch thereof, and the first adjusting switch 7 is connected to the first telescopic switch 81 of the first telescopic rod 8 through a first pull wire 20; the first telescopic rod 8 is rotatably connected to the backrest swing arm 6, and the first telescopic rod 8 rotates with the backrest swing arm 6 based on a first rotation axis 9, and the backrest swing arm 6 rotates with the backrest bracket 3 based on a second rotation axis 10, and the first rotation axis 9 and the second rotation axis 10 are parallel lines that do not overlap with each other. When the backrest swing arm 6 rotates around the second rotation axis 10 relative to the backrest bracket 3, the first rotation axis 9 between the first telescopic rod 8 and the backrest swing arm 6 will translate along the telescopic direction of the first telescopic rod 8. Therefore, the switch for adjusting the flipping angle of the backrest swing arm 6 relative to the backrest bracket 3 can be controlled by the telescopic action switch of the first telescopic rod 8, that is, when the first telescopic rod 8 can be telescoped, the backrest swing arm 6 can be flipped relative to the backrest bracket 3; when the first telescopic rod 8 is locked and cannot be telescoped, the backrest swing arm 6 is also locked and cannot be flipped relative to the backrest bracket 3.

[0031] Similarly, a second telescopic rod 100 is provided in the side leaning bracket 4, a second adjusting switch 101 is provided on the side leaning bracket 4, the second telescopic rod 100 is provided with a second telescopic switch 102, the second adjusting switch 101 is connected to the second telescopic switch 102 of the second telescopic rod 100, and the second telescopic rod 100 is rotatably connected to the side extension arm 12; the second telescopic rod 100 and the side extension arm 12 rotate based on a third rotation axis 103, and the side leaning bracket 4 and the side extension arm 12 rotate based on a fourth rotation axis 104, the third rotation axis 103 and the fourth rotation axis 104 are parallel lines that do not overlap with each other, and the side leaning bracket 4 is based on the telescopic action of the second telescopic rod 100 to achieve flipping adjustment relative to the side extension arm 12. When the user needs to perform side leaning flip adjustment, the second adjustment switch 101 is operated to trigger the second telescopic switch 102, and the second telescopic rod 100 is in a telescopic state, that is, the side leaning bracket 4 can be flipped and adjusted under the action of external force. When the side leaning bracket 4 is adjusted to the required angle, the second adjustment switch 101 is released, the second adjustment switch 101 is automatically reset, and at the same time, the second telescopic switch 102 is reset, and the second telescopic rod 100 is in a locked state. At this time, the side leaning bracket 4 remains locked in the adjusted position.

[0032] Correspondingly, a third adjustment switch 200 is provided on the seat frame 1, and a third telescopic rod 201 and a sliding mounting frame 202 are provided in the seat frame 1. The sliding mounting frame 202 is movably installed in the seat frame 1, one end of the sliding mounting frame 202 is connected to one end of the third telescopic rod 201, and the other end of the sliding mounting frame 202 is rotatably connected to the cross arm 21, and the other end of the third telescopic rod 201 is fixed on the seat frame 1, the sliding mounting frame 202 and the cross arm 21 rotate based on the fifth rotation axis 203, and the cross arm 21 and the seat frame 1 rotate based on the sixth rotation axis 204, and the fifth rotation axis 203 and the sixth rotation axis 204 are parallel lines that do not overlap with each other, and the corner swing arm 2 is based on the forward and backward sliding of the sliding mounting frame 202 and the telescopic action of the third telescopic rod 201 to rotate and adjust relative to the seat frame 1. The third telescopic rod 201 is fixedly connected to one end of the seat frame 1 and is provided with a third telescopic switch 205. The third adjusting switch 200 is connected to the third telescopic switch 205. When the angle of inclination of the corner swing arm 2 needs to be adjusted relative to the seat frame 1, the third telescopic switch 205 is controlled by the third adjusting switch 200 to make the third telescopic rod 201 in a telescopic state. The corner swing arm 2 is rotated and adjusted under the action of external force, and the corner swing arm 2 drives the sliding mounting frame 202 to move forward and backward. The sliding mounting frame 202 moves forward and backward to drive the third telescopic rod 201 to telescope. When the corner swing arm 2 is adjusted to the required inclination angle, the third adjusting switch 200 is reset, so that the third telescopic switch 205 of the third telescopic rod 201 is also reset to the closed state. At this time, the third telescopic rod 201 is in a locked state, the sliding mounting frame 202 is also in a locked state, and the corresponding corner swing arm 2 is also locked in the adjusted position.

[0033] In this embodiment, the lifting adjustment switch 5 is used to adjust the height position of the backrest, the first adjustment switch 7 is used to adjust the flip angle of the backrest, the second adjustment switch 101 is used to adjust the flip angle of the siderest, and the third adjustment switch 200 is used to adjust the inclination angle of the backrest. Therefore, the chair frame of this embodiment can achieve multiple adjustments to meet different usage requirements. For example, the backrest can be adjusted to a horizontal state through the first adjustment switch 7, and the backrest can be used as a tabletop, which is convenient for users to work or do homework on the backrest; the siderest can be adjusted to a horizontal state through the second adjustment switch 101, and the siderest and the seat cushion form a resting bed for users to lie flat and rest.

[0034] 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. A chair frame with a seat back lifting and adjusting structure, characterized in that: The invention comprises a seat frame (1), a corner swing arm (2), a backrest bracket (3) and a side support bracket (4); the rear side of the seat frame (1) is provided with a rear extension arm (11) for connecting to the corner swing arm (2); the rear extension arm (11) is rotatably connected to one end of the corner swing arm (2); the other end of the corner swing arm (2) is connected to the backrest bracket (3); the left and right sides of the seat frame (1) are provided with side extension arms (12) for connecting to the side support bracket (4); the side extension arms (12) are rotatably connected to the side support bracket (4); the corner swing arm (2) comprises a horizontal arm (21) for rotatably connecting to the rear extension arm (11) and a vertical arm (22) for connecting to the backrest bracket (3); the backrest bracket (3) is provided with a vertical arm (22) for connecting to the vertical arm (22) ) is inserted into an insertion cavity (31) for connection, the vertical arm (22) is provided with a plurality of lifting adjustment holes (221) arranged in an upper and lower interval arrangement on the rear side of the backrest bracket (3), a lifting adjustment switch (5) for controlling the lifting adjustment of the backrest bracket (3) is provided on the rear side of the backrest bracket (3), the lifting adjustment switch (5) can be extended into the lifting adjustment hole (221) so that the backrest bracket (3) and the vertical arm (22) are relatively locked, an isolation sleeve (32) is provided on the inner side of the insertion cavity (31), the isolation sleeve (32) is made of plastic, the isolation sleeve (32) is arranged between the backrest bracket (3) and the vertical arm (22), and a through groove (33) is provided on the rear side of the isolation sleeve (32) for the lifting adjustment switch (5) to pass through and enter the lifting adjustment hole (221) to cooperate.

2. The chair frame with a seat back lifting and adjusting structure according to claim 1, characterized in that: The lifting and lowering adjustment switch (5) comprises a rotating handle (51), a movable column (52), a compression spring (53) and a locking head (54); the rotating handle (51) is rotatably connected to one end of the movable column (52); the compression spring (53) is sleeved on the outer side of the movable column (52); the locking head (54) is connected to the other end of the movable column (52); the rotating handle (51) is located at the rear side of the backrest bracket (3); the movable column (52) extends from the rear side of the backrest bracket (3) into the insertion cavity (31); and the two ends of the compression spring (53) are respectively in contact with the inner side wall of the insertion cavity (31) and the end surface of the locking head (54).

3. The chair frame with a seat back lifting and adjusting structure according to claim 2, characterized in that: A protrusion (55) is provided on the side of the rotating handle (51) facing the backrest bracket (3). When the rotating handle (51) rotates relative to the movable column (52), the movable column (52) and the locking head (54) are moved rearward due to the contact between the protrusion (55) and the rear side of the backrest bracket (3), and the compression spring (53) is compressed.

4. The chair frame with a seat back lifting and adjusting structure according to claim 1, characterized in that: A plurality of isolation ridges (34) are provided on the inner side of the isolation sleeve (32), the isolation ridges (34) extending along the length direction of the isolation sleeve (32), and the plurality of isolation ridges (34) are arranged at intervals along the circumference of the isolation sleeve (32).

5. The chair frame with a seat back lifting and adjusting structure according to claim 1, characterized in that: The chair frame further comprises a backrest swing arm (6), the backrest swing arm (6) being rotatably connected to the backrest bracket (3), the backrest swing arm (6) being provided with a first adjustment switch (7) for controlling the adjustment of the tilting angle of the backrest swing arm (6) relative to the backrest bracket (3), the backrest bracket (3) being provided with a first telescopic rod (8) for implementing position adjustment and locking when cooperating with the backrest swing arm (6) to adjust the tilting angle relative to the backrest bracket (3), the first telescopic rod (8) being provided with a first telescopic switch (81) for controlling the switch of its telescopic action, the first adjustment switch (7) being connected to the first telescopic switch (81) of the first telescopic rod (8) via a first pull wire (20); the first telescopic rod (8) being rotatably connected to the backrest swing arm (6), the first telescopic rod (8) and the backrest swing arm (6) rotating based on a first rotation axis (9), the backrest swing arm (6) and the backrest bracket (3) rotating based on a second rotation axis (10), the first rotation axis (9) and the second rotation axis (10) being parallel lines that do not overlap with each other.

6. The chair frame with a seat back lifting and adjusting structure according to claim 5, characterized in that: A second telescopic rod (100) is provided inside the side support bracket (4), a second adjustment switch (101) is provided on the side support bracket (4), the second telescopic rod (100) is provided with a second telescopic switch (102), the second adjustment switch (101) is connected to the second telescopic switch (102) of the second telescopic rod (100), and the second telescopic rod (100) is rotatably connected to the side extension arm (12); the second telescopic rod (100) and the side extension arm (12) rotate based on a third rotation axis (103), the side support bracket (4) and the side extension arm (12) rotate based on a fourth rotation axis (104), the third rotation axis (103) and the fourth rotation axis (104) are parallel lines that do not overlap each other, and the side support bracket (4) is tilted and adjusted relative to the side extension arm (12) based on the telescopic action of the second telescopic rod (100).

7. The chair frame with a seat back lifting and adjusting structure according to claim 6, characterized in that: The seat frame (1) is provided with a third adjustment switch (200), the seat frame (1) is provided with a third telescopic rod (201) and a sliding mounting frame (202), the sliding mounting frame (202) is movably mounted in the seat frame (1), one end of the sliding mounting frame (202) is connected to one end of the third telescopic rod (201), the other end of the sliding mounting frame (202) is rotatably connected to the cross arm (21), and the other end of the third telescopic rod (201) is fixed to the seat frame ( 1), the sliding mounting frame (202) and the cross arm (21) rotate based on a fifth rotation axis (203), the cross arm (21) and the seat bottom frame (1) rotate based on a sixth rotation axis (204), the fifth rotation axis (203) and the sixth rotation axis (204) are parallel lines that do not overlap each other, and the corner swing arm (2) is rotatably adjusted relative to the seat bottom frame (1) based on the forward and backward sliding of the sliding mounting frame (202) and the telescopic action of the third telescopic rod (201).

8. The chair frame with a seat back lifting and adjusting structure according to claim 7, characterized in that: One end of the third telescopic rod (201) fixedly connected to the seat bottom frame (1) is provided with a third telescopic switch (205), and the third adjustment switch (200) is connected to the third telescopic switch (205).

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