A chair height detection device for chairs with irregular surfaces

Abstract

The present invention discloses a height detection device for a chair surface with irregular surfaces, and relates to the technical field of measurement of irregular surfaces. It includes: an airtight pipe, which is slidably provided with a sealing block; an airbag, which is arranged at the bottom of the airtight pipe, and the part below the sealing block and the airbag form a sealing cavity; an elastic mechanism, which is arranged above the sealing block to provide pressure to the airbag for the sealing block; a lifting mechanism, which is used to drive the airtight pipe to move toward / away from the chair surface in a vertical direction; a trigger mechanism, which triggers the lifting mechanism to stop moving when the pressure reaches a set pressure threshold; when the lifting mechanism stops moving, the first height of the airtight pipe is recorded, the first height is subtracted from the height calibration value, and the difference is summed with the standard chair surface height to obtain the height of the measured chair surface. The present invention can accurately detect the height of a chair surface with irregular surfaces under pressure without selecting a detection reference point.

Description

Technical Field

[0001] The invention relates to the technical field of irregular surface measurement, and in particular to a chair surface height detection device for a chair surface having an irregular surface. Background Art

[0002] In the process of chair research and development, production and testing, the width, seat height, chair depth, sitting depth and armrest height of office chairs are commonly used basic dimensional data. In addition, furniture ergonomics believes that the curved shape of the office chair's backrest and headrest is also very important for the research and evaluation of office chair comfort.

[0003] Among them, the detection of seat height, i.e., seat surface height, is usually achieved by setting a distance meter above the seat surface. The existing detection methods have the following limitations:

[0004] 1. In order to provide users with a better experience, the shapes of chair surfaces are becoming more and more diverse. For example, irregular surfaces are set on the chair surface to adapt to the shape of the buttocks. In this case, how to select the detection reference point of the chair surface height becomes a difficult point.

[0005] 2. When the user sits on the seat, the seat will drop to a certain extent under pressure, which is especially obvious on the seat covered with flexible materials. The height of the seat after the drop is the focus of the user's attention. In the existing seat detection process, the height under normal conditions is measured, which has a certain error compared with the actual seat height when the user is sitting.

[0006] Therefore, how to develop a device that can detect the height of a chair seat with an irregular surface under pressure is one of the problems that need to be solved urgently. Summary of the invention

[0007] In order to solve at least one of the technical problems mentioned in the background technology, the purpose of the present invention is to provide a chair surface height detection device for irregular surfaces, which can accurately detect the height of a chair surface containing irregular surfaces under pressure without selecting a detection reference point.

[0008] The present invention provides a device for detecting the height of a chair surface having an irregular surface, comprising:

[0009] An airtight pipe, in which a sealing block is slidably arranged;

[0010] An airbag is arranged at the bottom of the airtight pipe, and a portion of the airtight pipe below the sealing block forms a sealed cavity with the airbag;

[0011] An elastic mechanism, disposed above the sealing block, to provide pressure for the sealing block to press against the airbag;

[0012] A lifting mechanism, used to drive the airtight duct to move toward or away from the seat surface in a vertical direction;

[0013] A trigger mechanism is arranged in the airtight pipe, and when the pressure reaches a set pressure threshold, the lifting mechanism is triggered to stop moving;

[0014] When the lifting mechanism stops moving, the first height of the airtight pipe is recorded, the first height is subtracted from the height calibration value, and the difference is summed with the standard seat surface height to obtain the height of the measured seat surface; the height calibration value is the height recorded when the standard seat surface is detected.

[0015] In certain embodiments of the present invention, the elastic mechanism comprises a compression spring disposed in the airtight pipe, the top thread of the airtight pipe is fitted with a top cap, and the compression spring is disposed between the top cap and the sealing block.

[0016] In certain embodiments of the present invention, the trigger mechanism includes a touch switch located at the bottom of the top cap. When the airbag is squeezed by the seat surface, the sealing block moves upward until the sealing block contacts the touch switch, and the touch switch sends a signal to the lifting mechanism to stop moving.

[0017] In some embodiments of the present invention, the height of the touch switch is set to:

[0018] There is a first interval between the touch switch and the bottom of the compression spring in a natural state, and the first interval is equal to the pressure threshold divided by the elastic coefficient of the compression spring.

[0019] In certain embodiments of the present invention, the lifting mechanism includes a vertically arranged guide rail, a slide seat slidably connected to the guide rail, and a controller driving the slide seat to move along the guide rail. The slide seat is provided with a mounting bracket, and the airtight pipe is fixedly connected to the mounting bracket.

[0020] In certain embodiments of the present invention, an air valve for inflation and deflation is provided on the sealed cavity.

[0021] In certain embodiments of the present invention, a mounting plate extending in a horizontal direction is provided at the bottom of the airtight pipe, and the airbag is sealingly connected to the bottom surface of the mounting plate.

[0022] In certain embodiments of the present invention, a blocking mechanism for limiting the extension of the airbag in the horizontal direction is provided on the peripheral side of the airbag.

[0023] In certain embodiments of the present invention, the blocking mechanism includes a plurality of blocking bars arranged in a ring array along the circumference of the airbag, and the blocking bars extend in a vertical direction.

[0024] In certain embodiments of the present invention, a mounting groove penetrating in the vertical direction is provided on the mounting plate corresponding to each blocking bar, the blocking bar is slidably matched with the mounting groove, and an anti-drop cap is provided on the top of the blocking bar.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] On the one hand, the present invention uses the deformation ability of the airbag to adapt to the irregular surface of the seat surface, so there is no need to select a specific reference point during detection. On the other hand, the present invention provides pressure to the airbag through an elastic mechanism, and the pressure is finally applied to the seat surface through the airbag to simulate the weight of the user sitting on the seat surface. As the airbag gradually presses against the seat surface, the pressure increases accordingly, and the trigger mechanism stops the movement of the airbag when the pressure reaches the pressure threshold, which is equivalent to the simulated weight, thereby simulating the accurate seat height detected when the user is sitting. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of a seat structure with irregular surfaces.

[0028] Figure 2 It is a schematic diagram of the structure of the present invention.

[0029] Figure 3 It is a cross-sectional view of the present invention.

[0030] Figure 4 It is a schematic diagram of the internal structure of the airtight pipeline of the present invention.

[0031] Figure 5 It is a schematic diagram of the airbag of the present invention being compressed and deformed.

[0032] Figure 6 for Figure 3 A partial enlarged view of the compression spring in its natural state at point A in the middle.

[0033] Figure 7 yes Figure 6 A partial enlarged view of point B in the middle.

[0034] Figure 8 for Figure 3 A partial enlarged view of the compression spring in compressed state at point A in the middle.

[0035] Fig. 9 FIG. 4 is a schematic diagram of a blocking mechanism according to another embodiment of the present invention.

[0036] Fig.10 It is a schematic diagram of the airbag with a blocking mechanism of the present invention being deformed under pressure.

[0037] In the figure:

[0038] 1. Seat; 11. Seat surface; 12. Irregular surface;

[0039] 2. Airtight pipe; 21. Sealing block;

[0040] 3. Airbag;

[0041] 4. Elastic mechanism; 41. Compression spring; 42. Top cap; 43. First wiring trough;

[0042] 5. Lifting mechanism; 51. Guide rail; 52. Sliding seat; 53. Controller; 54. Mounting bracket; 55. Second wiring trough;

[0043] 6. Air valve;

[0044] 7. Mounting plate; 71. Mounting slot;

[0045] 8. trigger mechanism; 81. touch switch; 82. first wire;

[0046] 9. Blocking strip; 91. Anti-drop cap. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Embodiment 1:

[0049] Please refer to Figure 1 With the deepening of ergonomic research, it is common to provide an irregular surface 12 on the seat surface 11 of the chair 1. The shape of the irregular surface 12 is adapted to the buttocks of the human body, thereby providing a uniform force-bearing surface for the user sitting on the seat surface 11, so that the user can get a better experience.

[0050] When performing height detection on the seat surface 11 having the irregular surface 12 , it is often difficult for existing detection equipment to select a reference point due to the unevenness of the irregular surface 12 , and the detection result often has a large deviation due to the movement of the seat position.

[0051] On the other hand, existing detection equipment often detects the seat surface height in a natural state (not under pressure) rather than the actual seat surface height when the user is sitting (under pressure), and therefore does not meet the actual needs of users.

[0052] Based on this, this embodiment proposes a chair surface height detection device, which is intended to accurately detect the height of a chair surface with an irregular surface under pressure.

[0053] like Figure 2 and Figure 3 As shown, the seat surface height detection device mainly includes an airtight pipe 2, an airbag 3, an elastic mechanism 4, a lifting mechanism 5, and a trigger mechanism 8.

[0054] The following is an introduction to these components one by one:

[0055] The airtight pipe 2 is vertically arranged to provide an air flow channel. Figure 3 and Figure 4 As shown, a sealing block 21 is slidably provided in the airtight pipe 2. It is worth mentioning that a sealing fit is adopted between the sealing block 21 and the airtight pipe 2.

[0056] The airbag 3 is made of a flexible material and can be deformed under pressure. The airbag 3 is arranged at the bottom of the airtight pipe 2 , and the portion of the airtight pipe 2 below the sealing block 21 and the airbag 3 form a sealed cavity 30 .

[0057] Therefore, as the airbag 3 is pressurized, the sealing block 21 may be displaced in the airtight duct 2 .

[0058] In order to realize the inflation and deflation of the sealed cavity 30 , an air valve 6 for inflation and deflation is provided at the location of the sealed cavity 30 .

[0059] The elastic mechanism 4 is disposed above the sealing block 21 to provide pressure for the sealing block 21 to press against the airbag 3 .

[0060] For details, please refer to Figure 8 and Fig. 9 The elastic mechanism 4 includes a compression spring 41 arranged in the airtight pipe 2. The top thread of the airtight pipe 2 is equipped with a top cap 42. The compression spring 41 is arranged between the top cap 42 and the sealing block 21.

[0061] like Figure 5 As shown, the airbag 3 is deformed by pressure, and the sealing block 21 is displaced accordingly. Figure 6 The status switches to Figure 8 state, thereby pushing the compression spring 41 to compress.

[0062] The lifting mechanism 5 is used to drive the airtight pipe 2 and the sealing block 2, elastic mechanism and other components inside the airtight pipe 2 to move toward or away from the seat surface 11 in the vertical direction.

[0063] Specifically, the lifting mechanism 5 adopts an electric rail, including a vertically arranged guide rail 51, a slide 52 slidably connected to the guide rail 51, and a controller 53 driving the slide 52 to move along the guide rail.

[0064] In order to achieve the connection between the lifting mechanism 5 and the airtight pipe 2 , a mounting bracket 54 is provided on the slide seat 52 , and the airtight pipe 2 is fixedly connected to the mounting bracket 54 .

[0065] It is worth mentioning that in order to maintain balance, eliminate the torque or reduce stress between the guide rail 51 and the slide seat 52, the airtight pipe 2 is fixedly connected to the middle part of the mounting bracket 54, and a group of guide rails 51 and slide seats 52 are respectively provided at both ends of the mounting bracket 64 to realize the driving of the airtight pipe 2.

[0066] It is worth mentioning that a second wire is electrically connected between the controller 53 and the slide 52 . In order to realize the routing of the second wire, a second routing groove 55 connecting the controller 53 and the slide 52 is provided in the mounting bracket 54 .

[0067] Please refer to Figure 6 The trigger mechanism 8 is arranged in the airtight pipe 2, and when it is detected that the pressure pressed on the airbag 3 reaches a set pressure threshold, the lifting mechanism 5 is triggered to stop moving.

[0068] It is worth noting that the pressure threshold is selected with reference to the weight of an adult. For example, the pressure threshold corresponding to an adult weighing 65 kg may be selected as 65 kg × 9.8 N / kg, so that when the lifting mechanism 5 stops, the pressure applied to the airbag 3 by the elastic mechanism 4 (that is, the pressure ultimately applied by the airbag 3 to the seat surface 11) is equivalent to the pressure applied to the seat surface when the user sits down.

[0069] Please refer to Figure 7 The trigger mechanism 8 includes a touch switch 81 located at the bottom of the top cap 42. Figure 8 As shown, when the airbag 3 is squeezed by the seat surface, the sealing block 21 moves upward until the sealing block 21 contacts the touch switch 81, and the touch switch 81 sends a signal to the lifting mechanism 5 to stop moving.

[0070] It is worth mentioning that, in order to realize signal transmission of the touch switch 81, a first wire 82 is provided between the touch switch 81 and the controller 53. At the same time, in order to realize the routing of the first wire 82, a first routing groove 43 is provided on the top cap 42 at a position corresponding to the first wire 82.

[0071] When the lifting mechanism 5 stops moving, the first height H1 of the airtight pipe 2 is recorded. To facilitate the acquisition of the first height H1, the first height H1 may also be replaced by the height of the slide seat 52.

[0072] The difference between the first height H1 and the height calibration value H0 is ΔH=H1-H0, and the difference ΔH is added to the standard seat surface height Hx to obtain the height H of the seat surface to be measured, that is,

[0073] H=ΔH+Hx=(H1-H0)+Hx

[0074] The height calibration value H0 is the height recorded when the seat height detection device of the present invention is used to detect a standard seat surface.

[0075] In order to achieve that the pressure on the airbag 3 is exactly equal to the set pressure threshold when the lifting mechanism 5 stops moving, the present invention sets the position of the touch switch 81. Specifically, the height of the touch switch is set to:

[0076] like Figure 6 As shown, there is a first interval between the touch switch 81 and the bottom of the compression spring 41 in the natural state, and the first interval is equal to the pressure threshold divided by the elastic coefficient of the compression spring 41.

[0077] At the same time, when the compression spring 41 is in a natural state, air is inflated into the sealing chamber 30 through the air valve 6, so that the sealing block 21 moves upward until the sealing block 21 contacts the bottom of the compression spring 41, and the inflation action is stopped.

[0078] Therefore, when the seat height detection device is working, the pressure of the airbag 3 pressing on the seat surface 11 and the elastic force provided by the compression spring 41 are always equal. When the sealing block 21 contacts the touch switch 81, the compression amount of the compression spring 41 is equal to the first interval. Therefore, the elastic force provided by the compression spring 41 and the pressure of the airbag 3 pressing on the seat surface 11 are exactly equal to the set threshold value, that is, the state of an adult sitting on the seat surface 11 is simulated.

[0079] Embodiment 2:

[0080] The airbag 3 has a certain volume. In order to adapt to irregular surfaces of a larger area, the second embodiment is improved as follows on the basis of the first embodiment.

[0081] like Figure 4 and Figure 5 As shown, a mounting plate 7 extending in a horizontal direction is provided at the bottom of the airtight pipe 2 , and the airbag 2 is sealed and connected to the bottom surface of the mounting plate 7 .

[0082] Meanwhile, the air valve 6 is preferably mounted on the mounting plate 7 .

[0083] Embodiment three:

[0084] Considering that the deformation of the airbag 3 along the horizontal direction is uncertain, if it is not restricted, the detection result will also be biased.

[0085] Based on this, Fig. 9 and Fig.10 As shown, the third embodiment is improved as follows based on the first or second embodiment.

[0086] A blocking mechanism is provided on the peripheral side of the airbag 3 for limiting the extension of the airbag 3 in the horizontal direction.

[0087] The blocking mechanism includes a plurality of blocking bars 9 arranged in a circular array along the circumference of the airbag 3, and the blocking bars 9 extend in the vertical direction. The intervals between the blocking bars 9 can be freely selected, and the smaller the intervals, the smaller the deformation of the airbag 3 on the circumference, and the higher the detection accuracy of the seat height detection device.

[0088] Furthermore, the blocking strip 9 should be as close to the seat surface 11 as possible in the vertical direction. In order to make the bottom of the blocking strip 9 adapt to the seat surface 11 (including the irregular surface 12 or some curved surfaces at positions other than the irregular surface 12), the mounting plate 7 of this embodiment is provided with a mounting groove 71 penetrating in the vertical direction at a position corresponding to each blocking strip 9, and the blocking strip 9 is slidably matched with the mounting groove 71.

[0089] Thus, the blocking strip 9 can slide freely up and down relative to the mounting plate 7. Fig.10 As shown, when the airbag 3 moves toward the seat surface 11, the blocking strip 9 that first contacts the seat surface 11 stops moving first and slides relative to the mounting plate 7, while the remaining blocking strips 9 continue to descend until they contact the seat surface 11. Finally, the bottoms of all blocking strips 9 contact the seat surface 11, further reducing the deformation of the airbag 3 in the horizontal direction and improving the detection accuracy.

[0090] At the same time, in order to prevent the blocking strip 9 from being separated from the mounting plate 7 during the rising process of the airbag 3 , an anti-detachment cap 91 is provided on the top of the blocking strip 9 , and the cross-section of the anti-detachment cap 91 is larger than that of the blocking strip 9 .

[0091] 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 exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A chair height detection device for a chair with an irregular surface, characterized in that: include: An airtight pipe, in which a sealing block is slidably arranged; An airbag is arranged at the bottom of the airtight pipe, and a portion of the airtight pipe below the sealing block forms a sealed cavity with the airbag; An elastic mechanism, disposed above the sealing block, to provide pressure for the sealing block to press against the airbag; A lifting mechanism, used to drive the airtight duct to move toward or away from the seat surface in a vertical direction; A trigger mechanism is arranged in the airtight pipe, and when the pressure reaches a set pressure threshold, the lifting mechanism is triggered to stop moving; When the lifting mechanism stops moving, the first height of the airtight pipe is recorded, the first height is subtracted from the height calibration value, and the difference is summed with the standard seat surface height to obtain the height of the measured seat surface; the height calibration value is the height recorded when the standard seat surface is detected.

2. The device for detecting the height of a seat surface with an irregular surface according to claim 1, characterized in that: The elastic mechanism comprises a compression spring arranged in the airtight pipe, the top thread of the airtight pipe is matched with a top cap, and the compression spring is arranged between the top cap and the sealing block.

3. The device for detecting the height of a seat surface with an irregular surface according to claim 2, characterized in that: The trigger mechanism includes a touch switch located at the bottom of the top cap. When the airbag is squeezed by the seat surface, the sealing block moves upward until the sealing block contacts the touch switch, and the touch switch sends a signal to the lifting mechanism to stop moving.

4. The device for detecting the height of a seat surface with an irregular surface according to claim 3, characterized in that: The height of the touch switch is set to: There is a first interval between the touch switch and the bottom of the compression spring in a natural state, and the first interval is equal to the pressure threshold divided by the elastic coefficient of the compression spring.

5. A chair height detection device for a chair surface with an irregular surface according to claim 1 or 3, characterized in that: The lifting mechanism includes a vertically arranged guide rail, a slide seat slidably connected to the guide rail, and a controller driving the slide seat to move along the guide rail. A mounting bracket is arranged on the slide seat, and the airtight pipe is fixedly connected to the mounting bracket.

6. The device for detecting the height of a seat surface with an irregular surface according to claim 1, characterized in that: The sealed cavity is provided with an air valve for inflating and deflating air.

7. The device for detecting the height of a seat surface with an irregular surface according to claim 1, characterized in that: A mounting plate extending in a horizontal direction is arranged at the bottom of the airtight pipe, and the airbag is sealed and connected to the bottom surface of the mounting plate.

8. The device for detecting the height of a seat surface with an irregular surface according to claim 7, characterized in that: A blocking mechanism for limiting the extension of the airbag in the horizontal direction is arranged on the peripheral side of the airbag.

9. The device for detecting the height of a seat surface with an irregular surface according to claim 8, characterized in that: The blocking mechanism comprises a plurality of blocking bars arranged in a ring array along the circumference of the airbag, and the blocking bars extend in a vertical direction.

10. The device for detecting the height of a seat surface with an irregular surface according to claim 9, characterized in that: The mounting plate is provided with a mounting groove penetrating in the vertical direction at a position corresponding to each blocking bar, the blocking bar is slidably matched with the mounting groove, and an anti-drop cap is provided on the top of the blocking bar.

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