Office seat backrest height lifting locking structure

Abstract

The utility model belongs to the technical field of office chairs, and particularly relates to a height lifting and locking structure for a backrest of an office chair. A pair of sliding rails is arranged on the back face of the backrest assembly, connecting sliding blocks are movably connected into the sliding rails in a clamped mode, and lifting adjusting and locking assemblies are further arranged in the sliding rails. The lifting adjusting and locking assembly comprises a jacking button, a driving connecting rod, a limiting driving frame, an inclined guide groove and a helical tooth spring bolt; the upper end of the jacking button is connected with a pair of driving connecting rods, the top ends of the driving connecting rods are inserted into inclined guide grooves in the two sides of the limiting driving frame, and the front end of the limiting driving frame is provided with a pair of helical tooth spring bolts; the sliding rail is matched and inserted with the chair back support frame, and the helical tooth spring bolt is matched with a helical rack in the chair back support frame for lifting and locking. A backrest lifting structure of a traditional office chair is changed, the height of the backrest can be freely adjusted according to use requirements, and the problem that a traditional fixed type backrest structure or a paragraph type backrest structure is not suitable for people with different heights is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of office chairs, in particular to a backrest height lifting and locking structure for an office chair. Background Art

[0002] Modern people spend far more time in the office than at home, so a comfortable office chair plays a crucial role. However, prolonged sitting can also cause lower back pain. While the effectiveness of protective belts currently on the market claiming to prevent lower back pain remains unproven, over-reliance on belts can have the opposite effect. For computer users who may experience lower back pain from prolonged static sitting, choosing a suitable chair is crucial.

[0003] Generally speaking, when sitting with the torso upright or slightly forward (when the angle between the thigh and upper body is less than 90 degrees), the pressure on the lumbar intervertebral discs is greater than when standing. Therefore, long periods of static sitting (lack of posture changes) can easily lead to fatigue. This is why we often see people moving around to relieve discomfort after sitting for long periods of time. At the same time, the backrest supports part of the body weight, reducing the stress on the lumbar spine and allowing the muscles to relax. Therefore, it is important to ensure that the back is supported as much as possible while working to reduce low back fatigue.

[0004] Therefore, when the backrest is too high or too low, the lumbar spine cannot get proper support; the traditional office chair backrest is fixed or the backrest adjustment is uncontrollable, which cannot meet the usage needs of different groups of people. Therefore, an office chair backrest height lifting and locking structure is provided. Utility Model Content

[0005] In order to solve the defects and shortcomings of the existing technology, the purpose of the utility model is to provide an office chair backrest height lifting and locking structure with a simple structure, reasonable design and easy use. It changes the traditional office chair backrest lifting structure and can freely adjust the backrest height according to usage requirements, avoiding the problem that the traditional fixed backrest structure or the segmented backrest structure is not suitable for people of different heights.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: it comprises a supporting bracket, an adjustable base, a seat cushion, an adjustable armrest, and an adjustable backrest; the adjustable backrest is composed of a chair back support frame and a backrest assembly; wherein, a pair of sliding rails are provided on the back of the backrest assembly, a connecting slider is movably connected inside the sliding rails, and a lifting and lowering adjustment locking assembly is also provided inside the sliding rails; the lifting and lowering adjustment locking assembly comprises a jacking button, a driving connecting rod, a limit driving frame, an oblique guide groove, and an oblique tooth locking tongue; the upper end of the jacking button is connected to a pair of driving connecting rods, the top end of the driving connecting rod is inserted into the oblique guide grooves on both sides of the limit driving frame, and a pair of oblique tooth locking tongues are provided at the front end of the limit driving frame; the sliding rail is plugged into the chair back support frame, and the oblique tooth locking tongue cooperates with the oblique rack inside the chair back support frame to perform lifting and locking.

[0007] Preferably, the connecting slider is fixed to the reserved seat inside the chair back support frame with bolts, thereby achieving the connection and fixation between the chair back support frame and the backrest assembly.

[0008] Preferably, the top end of the driving connecting rod is an oblique support arm structure, which cooperates with the oblique guide groove to push the limit driving frame to move horizontally to one side, thereby realizing the limit unlocking of the oblique tooth lock tongue and the oblique rack.

[0009] Preferably, the helical tooth lock tongue and the helical rack maintain a helical tooth structure in the same direction, and the helical tooth lock tongue and the helical rack are unlocked and connected by means of horizontal dislocation to achieve up and down displacement between the helical tooth lock tongue and the helical rack.

[0010] Preferably, the lifting button is movably connected to the lower edge frame of the backrest assembly and cooperates with the return spring to realize the lifting and pressing structure.

[0011] After adopting the above structure, the beneficial effects of the utility model are:

[0012] 1. Meet personalized needs: People of different heights can adjust the backrest height according to the situation. After pressing, you can adjust it up and down at will, and it will be locked once you let go. You can find the most comfortable support position;

[0013] 2. Improve adaptability: Everyone has different body shapes and sitting habits. The adjustable backrest can adapt to various needs. Since the back support is different when sitting upright and half-lying, you can find a more relaxing posture.

[0014] 3. Improve comfort: When sitting on an office chair for a long time, a comfortable backrest height can reduce back fatigue; by adjusting the backrest height, the back muscles and spine can be better supported, reducing the soreness caused by maintaining the same posture for a long time; during work breaks, properly adjusting the backrest height can also relax the body, relieve tension, and improve work efficiency;

[0015] 4. Protect physical health: The adjustable backrest can help people maintain a good sitting posture and reduce spinal problems caused by improper sitting posture. For people with lumbar diseases or back pain, adjusting the backrest to a suitable height can relieve pain and promote recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention is described in detail through the following specific implementations and drawings.

[0017] Figure 1 It is a structural diagram of the utility model;

[0018] Figure 2 This is a schematic diagram of the backrest structure of the utility model;

[0019] Figure 3 This is a schematic structural diagram of the sliding track 9 of the present utility model;

[0020] Figure 4 This is a schematic diagram of the distribution of the lifting adjustment locking assembly 10 of the present utility model;

[0021] Figure 5 This is a structural diagram of the lifting adjustment locking assembly 10 of the present utility model;

[0022] Figure 6 This is a structural diagram of the chair back support frame 6 of the present utility model;

[0023] Figure 7 This is a schematic diagram of the lifting adjustment of the utility model;

[0024] Explanation of the reference numerals: support bracket 1, adjustment base 2, seat cushion 3, adjustable armrest 4, adjustable backrest 5, chair back support frame 6, backrest assembly 7, connecting slider 8, sliding track 9, lifting adjustment locking assembly 10, bevel rack 11, lifting button 101, driving connecting rod 102, limit driving frame 103, bevel guide groove 104, bevel tooth lock tongue 105. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, the present invention is described below using specific embodiments illustrated in the accompanying drawings. However, it should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention.

[0026] It should also be noted here that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the solution according to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0027] See Figures 1-6 As shown, this specific embodiment adopts the following technical solutions: it includes a support bracket 1, an adjustable base 2, a seat cushion 3, an adjustable armrest 4, and an adjustable backrest 5; the adjustable backrest 5 is composed of a chair back support frame 6 and a backrest assembly 7; wherein, a pair of sliding rails 9 are provided on the back of the backrest assembly 7, and a connecting slider 8 is movably connected to the sliding rail 9, and a lifting adjustment locking assembly 10 is also provided inside the sliding rail 9; the lifting adjustment locking assembly 10 includes a lifting button 101, a driving connecting rod 102, a limit driving frame 103, an oblique guide groove 104, and an oblique tooth lock tongue 105; the lifting button 1 The upper end of 01 is connected to a pair of driving connecting rods 102, the top ends of the driving connecting rods 102 are inserted into the oblique guide grooves 104 on both sides of the limit driving frame 103, and a pair of oblique tooth lock tongues 105 are provided at the front end of the limit driving frame 103; the sliding track 9 is plugged into the chair back support frame 6, and the oblique tooth lock tongue 105 cooperates with the oblique rack 11 inside the chair back support frame 6 to perform lifting and locking; the lifting and lowering adjustment locking assembly 10 can meet the needs of people of different heights to adjust the backrest height according to the situation. After pressing, it can be adjusted up and down at will, and it will be locked once you let go, so that you can find the most comfortable support position according to your needs;

[0028] The connecting slider 8 is fixed to the reserved seat inside the chair back support frame 6 with bolts, thereby connecting and fixing the chair back support frame 6 and the backrest assembly 7. The top of the driving link 102 is a diagonal support arm structure, which cooperates with the diagonal guide slot 104 to push the limit drive frame 103 to move horizontally to the side, thereby achieving the limit unlocking of the beveled tooth lock tongue 105 and the bevel rack 11. The beveled tooth lock tongue 105 and the bevel rack 11 maintain the same beveled tooth structure, and the beveled tooth lock tongue 105 and the bevel rack 11 are unlocked and connected by horizontal offset to achieve the up and down displacement between the beveled tooth lock tongue 105 and the bevel rack 11. The beveled tooth structure increases the accuracy and selectivity of the backrest height adjustment; the backrest can be adjusted to meet various needs according to each person's body shape and sitting habits. A comfortable backrest height can reduce back fatigue. By adjusting the backrest height, the back muscles and spine are better supported, reducing the soreness caused by maintaining the same posture for a long time. During work breaks, appropriately adjusting the backrest height can also relax the body, relieve tension, and improve work efficiency.

[0029] In addition, the lifting button 101 is movably connected to the lower edge frame of the backrest assembly 7, and cooperates with the return spring to realize the lifting and pressing structure. The convenience of adjustment is greatly improved, and it is easy to adjust and set.

[0030] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced within the present invention.

[0031] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An office chair backrest height lifting and locking structure, characterized by: The seat frame is adapted to be adjusted to allow the user to move the seat back into the upright position, with the seat frame being adapted to adjust the position of the user's seat and the user's controllable control panel being adapted to adjust the seat back.

2. The office chair backrest height lifting and locking structure according to claim 1, characterized in that: The connecting slide block is fixed to the reserved seat inside the chair back support frame with bolts, thereby achieving the connection and fixation between the chair back support frame and the backrest assembly.

3. The office chair backrest height lifting and locking structure according to claim 1, characterized in that: The top end of the driving connecting rod is an oblique support arm structure, which cooperates with the oblique guide groove to push the limit driving frame to move horizontally to one side, thereby realizing the limit unlocking of the oblique tooth lock tongue and the oblique rack.

4. The office chair backrest height lifting and locking structure according to claim 3, characterized in that: The helical tooth lock tongue and the helical rack maintain a helical tooth structure in the same direction, and the helical tooth lock tongue and the helical rack are unlocked and connected by means of horizontal dislocation to achieve up and down displacement between the helical tooth lock tongue and the helical rack.

5. The office chair backrest height lifting and locking structure according to claim 1, characterized in that: The lifting button is movably connected to the lower edge frame of the backrest assembly and cooperates with the return spring to realize the lifting and pressing structure.

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