Backrest rotation center self-adaptive adjusting system and method

Abstract

The invention belongs to the field of furniture, and discloses a backrest rotating center self-adaptive adjusting system and method.The backrest rotating center self-adaptive adjusting system comprises a matrix pressure sensor, a backrest, a backrest rotating support connected with the backrest and a backrest transverse movement driving mechanism connected with the backrest rotating support; and the backrest transverse movement driving mechanism comprises a plurality of pressure sensors which are arranged in an array, is arranged at the bottom of the chassis and is used for driving the backrest rotating bracket to move back and forth together with the backrest. Therefore, the rotation center of the backrest is adjusted. The position of the human ischial tuberosity point on the seat surface is detected, the position of the human trunk rotating shaft is calculated, the rotating center of the backrest is adjusted to the position coinciding with the rotating center of the human body in the horizontal direction, the phenomena of back rubbing and waist losing caused by unreasonable arrangement of the rotating shaft of the backrest are eliminated, reasonable support is provided for the human body in the backward leaning state, and the human body is more comfortable. Human body waist and back injury caused by long-term use of unreasonable office chairs is avoided.

Description

Technical Field

[0001] The present invention relates to the field of furniture, and particularly to a backrest rotation center adaptive adjustment system and method. Background Art

[0002] The backrest of an office chair is usually installed on the chassis. The chassis is usually lower than the seat surface. The chassis and the seat surface form a conventional seat. When a person leans on the backrest and causes the backrest to rotate, since the rotation point of the backrest is lower than the rotation point of the human body, when a person leans on the backrest and reclines backward, the rotation radius of the backrest is greater than the rotation radius of the human body. The backrest of the office chair deviates from the movement trajectory of the human back, resulting in the situation where the backrest drives the human clothing to rub upward and the lumbar support of the backrest disengages from the human waist. In the industry, this is called "back rubbing" and "waist loss".

[0003] The existing solutions mainly solve the above situation through the linkage technology of the backrest and the seat surface. However, due to the differences in human body shapes, the seat depths of different users are different, and the rotation axes of different users are relatively variable with respect to the rotation axis of the seat. The linkage technology of the backrest and the seat surface cannot meet the needs of all people, and as the reclining angle increases, the situations of "back rubbing" and "waist loss" will become more obvious. Summary of the Invention

[0004] The purpose of the present invention is to provide a backrest rotation center adaptive adjustment system and method to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: A backrest rotation center adaptive adjustment system includes a matrix pressure sensor, a backrest, a backrest rotation bracket connected to the backrest, and a backrest transverse movement driving mechanism connected to the backrest rotation bracket. The matrix pressure sensor is arranged on the seat surface and includes a number of pressure sensors arranged in an array. The backrest transverse movement driving mechanism is arranged at the bottom of the chassis and is used to drive the backrest rotation bracket together with the backrest to move back and forth, thereby adjusting the rotation center of the backrest.

[0006] Further, the backrest rotation bracket includes a first bracket connected to the backrest and a second bracket rotatably connected to the first bracket. The second bracket is connected to the backrest transverse movement driving mechanism, and the rotation connection between the first bracket and the second bracket is the rotation center of the backrest.

[0007] Further, there are two backrest rotation brackets, which are respectively connected to the left and right sides of the backrest.

[0008] Further, there are also two backrest transverse movement driving mechanisms, which are respectively connected to the two backrest rotation brackets.

[0009] Further, an elastic reset mechanism is connected between the lower end of the backrest and the main body of the seat.

[0010] The present invention also provides an adjustment method for the above-mentioned backrest rotation center adaptive adjustment system, including: Step 1, collect the seat surface pressure, identify the positions of the ischial tuberosities on both sides of the human body according to the seat surface pressure distribution, and calculate the position of the human hip joint according to the positions of the ischial tuberosities on both sides of the human body; Step 2, according to the position of the human hip joint, adjust the backrest rotation center to move to a position with the same coordinates as the human hip joint in the front-back direction.

[0011] Further, the said Step 1 includes: Matrix pressure sensors are arranged in the seat surface area, the pressure situation of the seat surface is collected through the matrix pressure sensors, and a pressure distribution image is output, and the positions of the ischial tuberosities on both sides of the human body are identified by processing the pressure distribution image.

[0012] Further, the said Step 1 also includes: Number the matrix pressure sensors, name each pressure sensor according to its row and column as P(X,Y), identify the positions of the ischial tuberosity nodes on both sides of the human body according to the generated pressure image, where the position of the left ischial tuberosity node is marked as P a (X a ,Y a ), the position of the right ischial tuberosity node is marked as P b (X b ,Y b ), the distance from the position of the human hip joint to the front end of the seat surface is (Y a +Y b ) / 2+L1, L1 represents the distance from the center point of the human hip joint in front of the ischial tuberosity node, X, X a , X b all represent the coordinates in the left-right direction of the seat, Y, Y a , Y b all represent the coordinates in the front-back direction of the seat.

[0013] Compared with the prior art, the beneficial effects of the present invention are: by detecting the positions of the human ischial tuberosity nodes on the seat surface, calculating the position of the human torso rotation axis, and adjusting the backrest rotation center to coincide with the human rotation center in the horizontal direction, the phenomena of "back rubbing" and "waist loss" caused by unreasonable setting of the backrest rotation axis are eliminated, and reasonable support is provided for the human body in the reclined state, avoiding damage to the human waist and back caused by long-term use of an unreasonable office chair. Description of the Drawings

[0014] Figure 1It is a diagram showing the positional relationship between the human hip joint and the ischial tuberosity.

[0015] Figure 2 It is one of the schematic diagrams of the seat structure to which an adaptive adjustment system for the rotation center of the backrest of the present invention is applied.

[0016] Figure 3 It is the second schematic diagram of the seat structure to which an adaptive adjustment system for the rotation center of the backrest of the present invention is applied.

[0017] Figure 4 It is the third schematic diagram of the seat structure to which an adaptive adjustment system for the rotation center of the backrest of the present invention is applied.

[0018] In the figure: backrest 1, backrest rotation bracket 2, first bracket 200, second bracket 201, backrest transverse movement drive mechanism 3, elastic reset mechanism 4, seat 5, left ischial tuberosity 6, right ischial tuberosity 7, matrix pressure sensor 8, hip bone a, hip joint b, femur c, coccyx d, ischium e. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to Figures 2 - 4 , an adaptive adjustment system for the rotation center of the backrest, including a matrix pressure sensor 8, a backrest 1, a backrest rotation bracket 2 connected to the backrest 1, and a backrest transverse movement drive mechanism 3 connected to the backrest rotation bracket 2. The matrix pressure sensor 8 is arranged on the seat surface and includes a number of pressure sensors arranged in an array. The backrest transverse movement drive mechanism 3 is arranged at the bottom of the chassis and is used to drive the backrest rotation bracket 2 together with the backrest 1 to move back and forth (Y direction), so as to adjust the rotation center of the backrest 1.

[0021] Continue to refer to Figures 2 - 4 , in an embodiment of the present invention, there are two backrest rotation brackets 2, which are respectively connected to the left and right sides of the backrest 1, and there are also two backrest transverse movement drive mechanisms 3, which are respectively connected to the two backrest rotation brackets 2.

[0022] Continue to refer to Figure 2 and Figure 3, in an embodiment of the present invention, the backrest rotation bracket 2 includes a first bracket 200 connected to the backrest 1 and a second bracket 201 rotatably connected to the first bracket 200. The second bracket 201 is connected to the backrest lateral movement driving mechanism 3. The first bracket 200 is arranged horizontally, and the second bracket 201 is arranged longitudinally. The rotation connection point between the first bracket 200 and the second bracket 201 is the rotation center of the backrest 1, and the axis of this rotation center is arranged along the left - right direction (X - direction).

[0023] Continue to refer to Figure 2 , in an embodiment of the present invention, the backrest lateral movement driving mechanism 3 is preferably an electric slide table. In addition, mechanisms such as pneumatic slide tables, electric push rods, pneumatic push rods, etc. can also be used.

[0024] Continue to refer to Figure 2 , in an embodiment of the present invention, an elastic reset mechanism 4 is connected between the lower end of the backrest 1 and the support column of the seat. The elastic reset mechanism 4 is preferably a spring rod. When the backrest 1 reclines backward, the elastic reset mechanism 4 can provide a supporting force and help the backrest 1 reset.

[0025] The present invention also provides an adjustment method for the above - mentioned backrest rotation center adaptive adjustment system. Before introducing the method of the present invention, a certain introduction to the human body structure is made first: As Figure 1 shown, when reclining, the rotation axis of the human torso is the hip joint of the human body, that is, when reclining in a sitting posture, the human torso rotates around the hip joint. The ischial tuberosity is the lowest end of the ischium. In the anatomical state of the normal position (erect neutral position), it is located about 5 cm below and behind the hip joint, and the included angle between the line connecting the two and the horizontal plane is about 45°. The position of the human hip joint relative to the ischial tuberosity is relatively fixed. Therefore, the position of the human hip joint can be inferred from the position of the ischial tuberosity of the human body in the sitting posture. To ensure that the backrest of the office chair closely adheres to the human back when reclining and there is no relative sliding, the rotation axis of the office chair backrest should coincide with or be close to the rotation axis of the human body.

[0026] The backrest rotation center adaptive adjustment method includes: Step 1, collect the seat surface pressure, identify the positions of the ischial tuberosities on both sides of the human body according to the seat surface pressure distribution, and calculate the position of the human hip joint according to the positions of the ischial tuberosities on both sides of the human body. Specifically, it includes: As Figure 4 shown, a matrix - type pressure sensor 8 is arranged in the seat surface area, which can collect the pressure condition of the seat surface and output a pressure distribution image, and process the pressure distribution image to identify the positions of the ischial tuberosities on both sides of the human body.

[0027] Number the matrix - type pressure sensors 8 installed on the seat surface. As Figure 4As shown: Named as P(X,Y) according to the row and column where the sensor is located, and the positions of the ischial tuberosity nodes on both sides of the human body are identified based on the generated pressure image. The position of the left ischial tuberosity node is marked as P a (X a ,Y a ), and the position of the right ischial tuberosity node is marked as P b (X b ,Y b ). Then the distance from the position of the human body rotation axis to the front end of the seat surface is (Y a +Y b ) / 2 + L1, where L1 represents the distance from the center point of the human hip joint in front of the ischial tuberosity node, usually 5 cm. X, X a , X b all represent the coordinates in the left - right direction of the seat, and Y, Y a , Y b all represent the coordinates in the front - back direction of the seat.

[0028] Step 2: According to the position of the human hip joint, the control system sends a command to the backrest transverse movement drive mechanism 3. The backrest transverse movement drive mechanism 3 drives the backrest rotation bracket 2 together with the backrest 1 to move back and forth, so that the rotation center of the backrest 1 moves to a position with the same Y - direction coordinate as the human hip joint.

[0029] Among them, the control system knows the initial Y - coordinate of the backrest rotation center. According to the position of the human hip joint, it can determine how much distance and in what direction the backrest rotation center needs to move.

[0030] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A backrest rotation center adaptive adjustment system, characterized in that, It includes a matrix pressure sensor (8), a backrest (1), a backrest rotation bracket (2) connected to the backrest (1), and a backrest lateral movement driving mechanism (3) connected to the backrest rotation bracket (2). The matrix pressure sensor (8) is arranged on the seat surface and includes a number of pressure sensors arranged in an array. The backrest lateral movement driving mechanism (3) is arranged at the bottom of the chassis and is used to drive the backrest rotation bracket (2) together with the backrest (1) to move back and forth, so as to adjust the rotation center of the backrest (1).

2. The backrest rotation center adaptive adjustment system according to claim 1, wherein The backrest rotation bracket (2) includes a first bracket (200) connected to the backrest (1) and a second bracket (201) rotatably connected to the first bracket (200). The second bracket (201) is connected to the backrest lateral movement driving mechanism (3), and the rotation connection between the first bracket (200) and the second bracket (201) is the rotation center of the backrest (1).

3. The adaptive adjustment system for the backrest rotation center according to claim 1, characterized in that There are two backrest rotation brackets (2), which are respectively connected to the left and right sides of the backrest (1).

4. The backrest rotation center self - adaptive adjustment system according to claim 3, characterized in that, There are also two backrest lateral movement driving mechanisms (3), which are respectively connected to the two backrest rotation brackets (2).

5. The backrest rotation center adaptive adjustment system according to claim 1, characterized in that An elastic reset mechanism (4) is connected between the lower end of the backrest (1) and the main body of the seat.

6. An adjustment method for a backrest rotation center adaptive adjustment system as described in any one of claims 1-5, characterized in that, It includes: Step 1: Collect the seat surface pressure, identify the positions of the ischial tuberosities on both sides of the human body according to the seat surface pressure distribution, and calculate the position of the human hip joint according to the positions of the ischial tuberosities on both sides of the human body. Step 2: According to the position of the human hip joint, adjust the rotation center of the backrest (1) to move to a position with the same coordinate as the human hip joint in the front-back direction.

7. A method for adaptively adjusting the rotation center of a backrest according to claim 6, characterized in that, The said Step 1 includes: A matrix pressure sensor (8) is arranged in the seat surface area. The pressure condition of the seat surface is collected through the matrix pressure sensor (8), and a pressure distribution image is output. The pressure distribution image is processed to identify the positions of the ischial tuberosities on both sides of the human body.

8. A method for adaptively adjusting the rotation center of a backrest according to claim 7, characterized in that, The said Step 1 also includes: Number the matrix pressure sensors (8), name them as P(X, Y) according to the rows and columns where each pressure sensor is located, and identify the positions of the ischial tuberosity nodes on both sides of the human body based on the generated pressure image. Among them, the position of the left ischial tuberosity node is marked as P a (X a ,Y a ), the position of the right ischial tuberosity node is marked as P b (X b ,Y b ). The distance from the position of the human hip joint to the front end of the seat surface is (Y a +Y b ) / 2 + L1, where L1 represents the distance between the center point of the human hip joint and the front of the ischial tuberosity node. X, X a , X b all represent the coordinates in the left-right direction of the seat, and Y, Y a , Y b all represent the coordinates in the front-back direction of the seat.

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