Method for automatic adjustment of height of a sit-stand desk
By acquiring data from upright and reclining sitting postures, calculating the shoulder height difference, and automatically adjusting the height of the height-adjustable table, the problem of existing height-adjustable tables being unable to adapt to reclining sitting postures is solved, thus realizing automatic height adjustment of the height-adjustable table.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ZHEJIANG SUNON FURNITURE MFG
- Filing Date
- 2023-09-20
- Publication Date
- 2026-06-02
AI Technical Summary
Existing height-adjustable desks cannot automatically adjust their height when users switch from an upright to a reclining posture, making it difficult for them to stretch their shoulders.
By acquiring data on users in upright and reclining sitting positions, the system calculates the difference in shoulder descent height and automatically adjusts the height of the adjustable desk to match the needs of the reclining posture.
The height-adjustable desk automatically lowers to a suitable height when the user switches from an upright sitting posture to a reclining sitting posture, ensuring that the shoulders can be relaxed.
Smart Images
Figure CN117331334B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of height-adjustable desk technology, and more specifically to a method for automatically adjusting the height of a height-adjustable desk. Background Technology
[0002] With the advancement of technology, height-adjustable desks are gradually entering people's daily lives. Currently, most height-adjustable desks use electric adjustment. When users need to adjust the height of the desk, they only need to press the button to control the height adjustment, so that the desk can be adjusted to a height that is suitable for their sitting posture.
[0003] Before sitting down to work, users adjust the height of the desk to a comfortable upright sitting position (i.e., sitting upright in the office chair) using buttons. However, when working in an office chair, people sometimes switch from an upright to a reclining position (i.e., sitting with their back against the chair back). In this reclining position, the shoulder height decreases compared to the upright position. The desk height remains the same as the height for the upright position and does not automatically adjust as the shoulders decrease. As a result, it is difficult for users to stretch their shoulders properly when working in a reclining position. Summary of the Invention
[0004] In order to solve at least one of the technical problems mentioned in the background art, the present invention aims to provide a method for automatically adjusting the height of a height-adjustable desk.
[0005] To achieve the above objectives, the present invention provides the following technical solution:
[0006] The automatic height adjustment method for height-adjustable desks includes the following steps:
[0007] S1. Obtain the first data of the user in an upright sitting position, the first data including the current height H1 of the height-adjustable table and the distance L from the user's shoulder to the hip;
[0008] S2. Determine if the user is in a reclining sitting position. If so, obtain the vertical distance L1 from the shoulder to the buttocks of the user in the reclining sitting position.
[0009] S3. Based on the distance L from the user's shoulder to the hip and the vertical distance L1 from the shoulder to the hip, calculate the height ΔH of the user's shoulder drop when switching from an upright sitting posture to a reclining sitting posture. ΔH = L - L1.
[0010] S4. Based on the height ΔH of the shoulder descent, the height-adjusting table adjusts its own height to the target height H, where H = H1 - ΔH.
[0011] Compared with existing technologies, the advantages of this solution are:
[0012] In this solution, when a user switches from an upright sitting position to a reclining sitting position, the height adjustment table can automatically lower, ensuring that the lowering height of the table is the same as the lowering height of the user's shoulders when switching from an upright to a reclining sitting position. Thus, as long as the height of the table is suitable for the user's shoulder height when the user is in an upright sitting position, the table can automatically adjust to the suitable shoulder height when the user switches to a reclining sitting position.
[0013] Preferably, in step S1, the distance from the user's shoulder to their hip in an upright sitting position is obtained, including:
[0014] S11. Obtain second data of the user in an upright sitting posture. The second data includes the height H2 of the user's shoulder from the ground, the amount of compression of the office chair cushion x, and the height z of the bottom of the office chair shell from the ground.
[0015] S12. Based on the compression amount x of the office chair seat cushion and the height z of the bottom of the office chair base shell from the ground, calculate the user's actual sitting height H3, H3 = z + y - x, where y represents the distance from the bottom of the office chair base shell to the seat surface of the seat cushion in the natural state.
[0016] S13. Based on the actual sitting height H3, calculate the distance L from the user's shoulder to the hip, L = H2 - H3.
[0017] Preferably, in step S11, the height H2 of the user's shoulder from the ground in an upright sitting position is obtained by a 3D camera module installed on the lifting table.
[0018] Preferably, the 3D camera module acquires the height H2 of the user's shoulder from the ground in an upright sitting posture, including:
[0019] S111, the 3D camera module detects the height of the user's left and right shoulders from the ground and calculates the height difference ΔH1 between the left and right shoulders and the ground.
[0020] S112. If ΔH1 is less than or equal to the set value, the user is determined to be in the correct upright sitting posture, and the process proceeds to step S113. If ΔH1 is greater than the set value, the user is determined to be in the wrong upright sitting posture, and the user is reminded to switch to the correct upright sitting posture.
[0021] S113. Take the average height of the user's left and right shoulders from the ground as the height H2 of the user's shoulders from the ground in an upright sitting position.
[0022] Preferably, the set value is 1cm.
[0023] Preferably, in step S11, obtaining the compression amount x of the office chair cushion when the user is sitting upright includes: detecting the pressure value of the cushion by a first pressure detection element located between the office chair cushion and the bottom shell, and comparing the pressure value with the indentation hardness curve of the office chair cushion to obtain the compression amount x of the office chair cushion.
[0024] Preferably, in step S2, determining whether the user is in a reclining posture includes: determining whether the user is in a reclining posture based on whether a pressure signal is generated by a second pressure detector located on the back of the office chair; when a pressure signal is generated by the second pressure detector, the user is determined to be in a reclining posture.
[0025] Preferably, in step S2, obtaining the vertical distance L1 from the shoulder to the hip of the user in a reclining sitting position includes:
[0026] S21. Obtain the user's reclining angle A in a reclining sitting posture;
[0027] S22. Substitute the tilt angle A into the formula: L1 = L * COSA, to obtain the vertical distance L1 from the shoulder to the hip.
[0028] Preferably, obtaining the reclining angle A of the user in a reclining posture includes: detecting the movement angle β of the office chair back by using an angle detection device located at the connection between the office chair back and the office chair chassis, where the reclining angle A = α + β, and α represents the inherent tilt angle of the office chair back.
[0029] Preferably, in step S11, the height z of the bottom of the office chair base shell from the ground is detected by a distance detection device located at the bottom of the office chair base shell.
[0030] Other advantages and effects of the present invention will be specifically explained in the detailed description and accompanying drawings. Attached Figure Description
[0031] Figure 1 This is a schematic diagram of the back side structure of the present invention when the user is in an upright sitting office position.
[0032] Figure 2 This is a schematic diagram of the side structure of the present invention when the user is in an upright sitting position while working.
[0033] Figure 3 This is a schematic diagram of the structure of the office chair of the present invention;
[0034] Figure 4 This is a schematic diagram illustrating the change in the user's state when switching from an upright sitting posture to a reclining sitting posture. Detailed Implementation
[0035] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.
[0036] In the following description, terms such as “inner,” “outer,” “upper,” “lower,” “left,” and “right” that indicate orientation or positional relationship are used only for the convenience of describing the embodiments and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.
[0037] Example 1
[0038] Please see Figure 1 As shown in Figure 4, this embodiment provides a method for automatically adjusting the height of a height-adjustable table, mainly used to automatically adjust the height of the height-adjustable table 1 when a person switches from an upright sitting posture to a reclining sitting posture; as shown in Figure 4. Figure 3 As shown, the upright sitting posture refers to a person sitting upright on the seat cushion 21 of the office chair with their torso straight; while the reclining sitting posture refers to a person sitting on the seat cushion 21 of the office chair with their back against the backrest 24 of the office chair.
[0039] In this embodiment, as Figure 2 and Figure 3 As shown, the height-adjustable desk 1 can be an electric height-adjustable desk, that is, a height-adjustable desk driven and controlled by a motor; while the office chair 2 mainly includes a seat cushion 21, a base shell 22, a base 23, and a backrest 24; the seat cushion 21 is installed on the top of the base shell 22, the base 23 is fixed to the bottom of the base shell 22, and the lower end of the backrest 24 is installed on the base 23; the seat cushion 21 is generally made of a flexible material, such as sponge.
[0040] In this embodiment, the automatic height adjustment method for the height-adjustable desk mainly includes steps S1-S4, specifically:
[0041] S1. Obtain the user's first data in an upright sitting posture, such as... Figure 2 As shown, the first data includes: the current height H1 of the height-adjustable desk and the distance L from the user's shoulder to their hip. The height of the height-adjustable desk refers to the height of the desk's tabletop from the ground.
[0042] Specifically, the user first manually adjusts the height of the office chair and the height-adjustable desk to a comfortable height for upright sitting while working. This height is the aforementioned current height H1. Figure 1 and Figure 2As shown; it is worth noting that, generally, height-adjustable desks have the function of recording their own height, so the current height H can be obtained by the height-adjustable desk itself.
[0043] It is understandable that, such as Figure 1 As shown, when a user is in an upright sitting position, the distance L from the shoulder to the hip is equivalent to the length of the human torso.
[0044] In step S1, the step of obtaining the distance L from the user's shoulder to the hip in an upright sitting position includes S11-S13, specifically:
[0045] S11. Obtain the user's second data in an upright sitting posture, such as... Figure 2 As shown, the second data includes the height H2 of the user's shoulder from the ground, the amount of compression x of the office chair seat cushion 21, and the height z of the bottom of the office chair base shell 22 from the ground;
[0046] In step S11, as Figure 1 As shown, the height H2 of a user's shoulder from the ground in an upright sitting position can be obtained by the 3D camera module 11 installed on the lifting table. Specifically, when a person sits upright in an office chair, the 3D camera module 11 captures the height H2 of the user's shoulder from the ground.
[0047] When a person sits in an office chair, it is difficult to ensure that both shoulders are at the same height. It is easy for one shoulder to be higher than the other. If the height difference between the two shoulders is large, the final data collected will be less accurate, affecting the subsequent adjustment accuracy of the height-adjustable desk.
[0048] Therefore, in step S11 of this embodiment, the 3D camera module 11 acquires the height H2 of the user's shoulder from the ground in an upright sitting posture, including steps S111-S113, as follows:
[0049] S111 and 3D camera module 11 respectively detect the height of the user's left and right shoulders from the ground. The system calculates the height difference ΔH1 between the left and right shoulders and the ground. That is, the height difference ΔH1 is obtained by subtracting the height of the two shoulders from the ground.
[0050] S112. The system determines whether the user is in a correct upright sitting posture based on ΔH1. Specifically:
[0051] If ΔH1 is less than or equal to the set value, the user is determined to be in the correct upright sitting posture, and the process proceeds to step S113, where the set value can be 1 cm.
[0052] If ΔH1 is greater than the set value, it is determined that the user is in an incorrect upright sitting posture, and the user is reminded to switch to the correct upright sitting posture. After switching to the correct upright sitting posture, proceed to step S113.
[0053] S113. Take the average height of the user's left and right shoulders from the ground as the height H2 of the user's shoulders from the ground in an upright sitting position, so as to obtain the height H2 of the user's shoulders from the ground in an upright sitting position.
[0054] In step S11, the method for obtaining the compression amount x of the office chair cushion 21 when the user is in an upright sitting position is as follows: Figure 3 As shown, the pressure value of the seat cushion 21 is detected by the first pressure detection element 221 (the first pressure detection element 221 can also be a pressure sensor module) located between the office chair seat cushion 21 and the bottom shell 22. The pressure value is compared with the indentation hardness curve of the office chair seat cushion 21 to automatically obtain the amount of compression x of the office chair seat cushion 21.
[0055] It is worth noting that the office chair cushion 21 is generally made of sponge (foam material), which will deform under pressure and its thickness will decrease due to compression. For example, when a person sits on the cushion 21, the cushion 21 will be compressed. The indentation hardness curve of the office chair cushion 21 mainly refers to the force and compression curve of the sponge cushion, which can be obtained according to the GB / T 10802-2006 standard. Based on this curve, as long as the pressure value of the cushion 21 is detected by the first pressure detection element 221, the system can determine the compression amount x of the sponge.
[0056] In step S11, the method for obtaining the height z of the bottom of the office chair base 22 from the ground in an upright sitting position is as follows: Figure 2 As shown, the height z of the bottom of the office chair base 22 from the ground is detected by a distance detection element 231 (for example, a distance sensor) located at the bottom of the office chair base 22.
[0057] After obtaining the compression amount x of the office chair seat cushion 21 and the ground clearance z of the bottom of the office chair base shell 22 in step S11, you can proceed to step S12:
[0058] S12. Substitute the compression amount x of the office chair seat cushion 21 and the height z of the bottom of the office chair base shell 22 from the ground into formula (1) to calculate the user's actual sitting height H3; Figure 3 As shown, the actual sitting height H3 here is equivalent to the height of the user's buttocks from the ground when the user is sitting in the office chair.
[0059] H3=z+y-x (1)
[0060] Where y represents the distance from the bottom of the office chair base shell 22 to the seat surface of the seat cushion 21 in the natural state; the natural state can also be understood as the office chair seat cushion 21 being in a state where no force is applied; therefore, y can also be understood as the distance from the bottom of the office chair base shell 22 to the seat surface of the office chair seat cushion 21 when no one is sitting on it. This distance is a fixed value, a constant. When x, y, and z are known, the system can automatically calculate the actual seat height H3 using formula (1).
[0061] S13. Based on the actual sitting height H3, substitute it into formula (2) to calculate the distance L1 from the user's shoulder to the hip.
[0062] L=H2-H3 (2)
[0063] Where H2 is the height from the user's shoulder to the ground in an upright sitting posture, and H3 is the actual sitting height; for example Figure 2 As shown, in an upright sitting position, subtracting the person's actual sitting height H3 from the height H2 from the person's shoulder to the ground gives the distance L from the user's shoulder to the hip, which is the length of the human torso. It can be understood that when a person switches from an upright sitting position to a reclining sitting position, their torso length remains basically unchanged.
[0064] After completing step S1, proceed to step S2:
[0065] S2. Determine if the user is in a reclining sitting position. If so, ... Figure 4 As shown, the vertical distance L1 from the shoulder to the hip of the user in a reclining sitting position is obtained, and the process proceeds to step S3; otherwise, the current height H1 of the height-adjustable table is kept unchanged.
[0066] The specific method for determining whether someone is in a reclining sitting posture is as follows:
[0067] like Figure 3 As shown, a second pressure detection element 241 can be installed in the backrest 24 of the office chair. For example, the second pressure detection element 241 can be a pressure sensor module. The user is judged to be in a reclining posture by whether the second pressure detection element 241 generates a pressure signal. When the person leans against the backrest 24, the second pressure detection element 241 will sense the pressure from the human body and generate a pressure signal, indicating that the user is in a reclining posture. When the person is working in an upright posture, the second pressure detection element 241 will not output a pressure signal, indicating that the person is not in a reclining posture.
[0068] In step S2, the method for obtaining the vertical distance L1 from the shoulder to the hip of the user in a reclining sitting position includes steps S21-S22, specifically, as follows: Figure 4 As shown:
[0069] S21. Obtain the user's reclining angle A in a reclining sitting posture. Here, reclining angle A can also be understood as the angle between the user's torso and the vertical direction in a reclining sitting posture.
[0070] The method to obtain the backward tilt angle A can be as follows: Figure 4 As shown, the movement angle β of the office chair backrest 24 is detected by an angle detection component 3 (such as an angle sensor) located at the connection between the office chair backrest 24 and the office chair chassis 23.
[0071] Wherein, the reclining angle A = α + β, where α represents the inherent tilt angle of the office chair back 24, which is known.
[0072] S22, such as Figure 4 As shown, by substituting the backward tilt angle A into formula (3), the system can calculate the vertical distance L1 from the shoulder to the hip:
[0073] L1 = L * COSA (3)
[0074] Where L is the distance from the user's shoulder to the hip, i.e., the length of the torso; A is the backward tilt angle.
[0075] S3. The system automatically calculates the height ΔH of the shoulder drop when the user switches from an upright sitting posture to a reclining sitting posture according to formula (4):
[0076] ΔH=L-L1 (4)
[0077] Where L is the distance L from the shoulder to the hip obtained when the user is in an upright sitting position (i.e., the user's torso length); L1 is the vertical distance L1 from the shoulder to the hip obtained when the user is in a reclining sitting position.
[0078] Combining formulas (3) and (4) yields formula (5);
[0079] ΔH=L-L*COS(α+β) (5)
[0080] It is understandable that when a person is sitting in a reclining position, their torso is tilted. Therefore, the shoulders in a reclining position will be lower vertically compared to the shoulders in an upright position. The difference in height of this drop is the aforementioned shoulder drop height ΔH.
[0081] S4. Based on formula (6) and the height ΔH of the shoulder descent, the system controls the height adjustment table to adjust its own height to the target height H. The target height can be understood as the height suitable for the user's current reclining posture. At this time, it is equivalent to the system controlling the height adjustment table to descend at the same descent height ΔH as the human shoulder.
[0082] H = H1 - ΔH (6)
[0083] H1 represents the current height of the height-adjustable desk in an upright sitting position;
[0084] Combining formulas (5) and (6), we can obtain the following formula: H = H1 - (L - L * COS(α + β)) = H1 - L + L * COS(α + β).
[0085] Therefore, in this embodiment, when the user switches from an upright sitting position to a reclining sitting position, the height adjustment table can automatically lower, and ensure that the height of the lowering is the same as the height of the user's shoulders when switching from an upright sitting position to a reclining sitting position; thus, as long as the height of the height adjustment table is suitable for the user's shoulder height when the user is in an upright sitting position, the height adjustment table can automatically adjust to the suitable height for the user's shoulders when the user switches to a reclining sitting position.
[0086] Example 2
[0087] This embodiment provides an automatic height adjustment system for a height-adjustable desk based on Embodiment 1, including a height-adjustable desk, an office chair, and a control system; the control system uses the automatic height adjustment method for the height-adjustable desk described in Embodiment 1 to achieve automatic height adjustment of the desk.
[0088] 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 invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.
Claims
1. A method for automatically adjusting the height of a height-adjustable desk, characterized in that, Includes the following steps: S1. Obtain the first data of the user in an upright sitting position, the first data including the current height H1 of the height-adjustable table and the distance L from the user's shoulder to the hip; S2. Determine if the user is in a reclining posture. If so, obtain the reclining angle A of the user in the reclining posture, and apply the formula... Calculate the vertical distance L1 from the shoulder to the hip, and proceed to step S3; Obtaining the recline angle A of the user in a reclined sitting position includes: detecting the movement angle β of the office chair back by means of an angle detection device located at the connection between the office chair back and the office chair chassis, where the recline angle A = α + β, and α represents the inherent tilt angle of the office chair back. S3. Based on the distance L from the user's shoulder to hip and the vertical distance L1 from the shoulder to hip, calculate the height of shoulder descent when the user switches from an upright sitting posture to a reclining sitting posture. H, H = L - L1; S4. Based on the height of shoulder descent H, the height-adjustable table adjusts its height to the target height H, H=H1- H.
2. The method for automatically adjusting the height of a height-adjustable desk according to claim 1, characterized in that, In step S1, the distance L from the user's shoulder to their hip is obtained when the user is in an upright sitting position, including: S11. Obtain second data of the user in an upright sitting posture. The second data includes the height H2 of the user's shoulder from the ground, the amount of compression of the office chair cushion x, and the height z of the bottom of the office chair shell from the ground. S12. Based on the compression amount x of the office chair seat cushion and the height z of the bottom of the office chair base shell from the ground, calculate the user's actual sitting height H3, H3=z+yx, where y represents the distance from the bottom of the office chair base shell to the seat surface of the seat cushion in the natural state. S13. Based on the actual sitting height H3, calculate the distance L from the user's shoulder to the buttocks, L=H2-H3.
3. The method for automatically adjusting the height of a height-adjustable desk according to claim 2, characterized in that, In step S11, the height H2 of the user's shoulder from the ground in an upright sitting position is obtained by the 3D camera module installed on the lifting table.
4. The method for automatically adjusting the height of a height-adjustable desk according to claim 3, characterized in that, The 3D camera module acquires the height H2 of the user's shoulder from the ground in an upright sitting position, including: The S111 3D camera module detects the height of the user's left and right shoulders from the ground and calculates the height difference between the left and right shoulders and the ground. H1; S112, if If H1 is less than or equal to the set value, the user is determined to be in the correct upright sitting posture, and the process proceeds to step S113; if If H1 is greater than the set value, it is determined that the user is in an incorrect upright sitting posture, and the user is reminded to switch to the correct upright sitting posture. S113. Take the average height of the user's left and right shoulders from the ground as the height H2 of the user's shoulders from the ground in an upright sitting position.
5. The method for automatically adjusting the height of a height-adjustable desk according to claim 4, characterized in that, The set value is 1cm.
6. The method for automatically adjusting the height of a height-adjustable desk according to claim 2, characterized in that, In step S11, the compression amount x of the office chair cushion under the user's upright sitting posture is obtained, including: detecting the pressure value of the cushion by a first pressure detection element located between the office chair cushion and the bottom shell, and comparing the pressure value with the indentation hardness curve of the office chair cushion to obtain the compression amount x of the office chair cushion.
7. The method for automatically adjusting the height of a height-adjustable desk according to claim 1, characterized in that, In step S2, determining whether the user is in a reclining posture includes: determining whether the user is in a reclining posture based on whether a pressure signal is generated by a second pressure detector located on the back of the office chair. When a pressure signal is generated by the second pressure detector, it is determined that the user is in a reclining posture.
8. The method for automatically adjusting the height of a height-adjustable desk according to claim 2, characterized in that, In step S11, the height z of the bottom of the office chair shell from the ground is detected by a distance detection device located at the bottom of the office chair shell.