Automobile seat backrest endurance test device with safety air bag and test method thereof

Abstract

The invention discloses an endurance test device and test method for an automobile seat backrest with a safety air bag, and relates to the technical field of automobiles. The portal frame is provided with a fixed false back, the fixed false back is arranged above the seat fixing frame, and a seat mounting station is formed between the fixed false back and the seat fixing frame; a movable false back; the adjusting mechanism is connected with the portal frame and the movable false back and is used for driving the movable false back to be close to or far away from the seat fixing frame so as to clamp or loosen the backrest of the seat to be tested; the force sensor is used for detecting the pressure applied to the to-be-detected seat backrest by the movable false back; and the control cabinet is connected with the adjusting mechanism and the force sensor. The technical problem that in the prior art, it is difficult to test the durability of the automobile seat with the safety air bag in the early stage of production and evaluate the durability of the automobile seat with the safety air bag is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and particularly to a durability test device for an automobile seat backrest with an airbag and a test method thereof. Background Art

[0002] With the improvement of the passive safety performance of automobile seats, many side supports of automobile seat backs are internally provided with airbags, which can provide effective anti-collision protection for occupants. The airbag is built into the side support of the seat back. During the process of getting on and off the vehicle, the back extrusion and peristalsis will squeeze the side support of the seat back, thereby indirectly squeezing the airbag. In practical applications, the durability of the seat back and the airbag is crucial.

[0003] Currently, there is a lack of durability performance testing for automobile seats with airbags in the early stage of production, and it is difficult to evaluate the durability performance of automobile seats with airbags. Summary of the Invention

[0004] The present application provides a durability test device for an automobile seat backrest with an airbag and a test method thereof, which can solve the technical problem in the prior art that it is difficult to conduct durability performance testing on an automobile seat with an airbag in the early stage of production and evaluate the durability performance of the automobile seat with an airbag.

[0005] In a first aspect, an embodiment of the present application provides a durability test device for an automobile seat backrest with an airbag, which includes:

[0006] A seat fixing frame;

[0007] A gantry, on which a fixed false back is provided. The fixed false back is arranged above the seat fixing frame and forms a seat installation station with the seat fixing frame;

[0008] A movable false back;

[0009] An adjusting mechanism, which is connected to the gantry and the movable false back and is used to drive the movable false back to approach or move away from the seat fixing frame to clamp or release the seat backrest to be tested;

[0010] A force sensor, which is used to detect the pressure applied by the movable false back to the seat backrest to be tested;

[0011] And a control cabinet 6, which is connected to the adjusting mechanism and the force sensor.

[0012] In combination with the first aspect, in an embodiment, a connecting cross arm is provided on the gantry, a connecting vertical arm is vertically connected to the connecting cross arm, and the fixed false back is arranged at one end of the connecting vertical arm away from the connecting cross arm.

[0013] In combination with the first aspect, in one embodiment, the adjustment mechanism includes:

[0014] A first sub-adjustment mechanism, which is disposed through the connecting cross-arm, the first sub-adjustment mechanism is connected to the movable false back, and is configured to drive the movable false back to rotate in a vertical plane;

[0015] A second sub-adjustment mechanism, which is connected to the first sub-adjustment mechanism, and is configured to drive the first sub-adjustment mechanism to move, so that the movable false back rotates in a horizontal plane.

[0016] In combination with the first aspect, in one embodiment, the first sub-adjustment mechanism includes:

[0017] A rotating arm;

[0018] A rotating shaft, one end of the rotating shaft passes through the connecting cross-arm and is fixed on the rotating arm, and the other end is rotatably connected to the end of the movable false back;

[0019] And a lifting cylinder, which is installed on the rotating arm, one end of the lifting cylinder is rotatably connected to the movable false back, and is configured to drive the movable false back to swing in a vertical plane.

[0020] In combination with the first aspect, in one embodiment, the second sub-adjustment mechanism includes:

[0021] A rotating bearing, the rotating shaft is fixed to the connecting cross-arm through the rotating bearing;

[0022] A swinging cylinder, which is connected to the rotating arm, and is configured to drive the rotating arm to move, so that the movable false back swings in a horizontal plane;

[0023] And an auxiliary column, the swinging cylinder is fixedly connected to the rotating arm, and the swinging cylinder is rotatably connected to the auxiliary column.

[0024] In combination with the first aspect, in one embodiment, a limiting arc is formed on the connecting cross-arm, and a positioning pin is arranged on the rotating arm, and the positioning pin is inserted into the limiting arc.

[0025] In combination with the first aspect, in one embodiment, the fixed false back is rotatably arranged on the connecting vertical arm, and one end of the fixed false back away from the connecting vertical arm is connected with a fixed seat through a double hinge rod.

[0026] In combination with the first aspect, in one embodiment, an automotive seat back durability test device with an airbag further includes an angle adjustment mechanism, and the angle adjustment mechanism includes:

[0027] Arc-shaped adjustment seat, the arc-shaped adjustment seat is installed on the gantry, and an arc groove is provided on the arc-shaped adjustment seat;

[0028] Angle adjustment plate, a positioning projection is provided on the angle adjustment plate, the positioning projection is slidably arranged in the arc groove, and one end of the angle adjustment plate away from the arc-shaped adjustment seat is connected to the connecting cross arm;

[0029] Locking bolt, the locking bolt passes through the arc-shaped adjustment seat and the angle adjustment plate at the same time;

[0030] And a lock nut, the lock nut is threadedly connected to the protruding end of the locking bolt.

[0031] In a second aspect, an embodiment of the present application provides a durability test method for an automobile seat backrest with a safety airbag, which includes:

[0032] Install the seat backrest to be tested at the seat installation station of the durability test device for an automobile seat backrest with a safety airbag according to any one of claims 1-8 above;

[0033] Control the adjustment mechanism to drive the movable false back to reciprocate according to a preset number of times; the reciprocating motion includes: approaching the seat fixing frame to clamp the seat backrest to be tested and then moving away from the seat fixing frame to release the seat backrest to be tested.

[0034] Combined with the second aspect, in one implementation, the reciprocating action further includes:

[0035] The axis of the movable false back is parallel to the longitudinal plane of the seat backrest to be tested, and at this time the movable false back does not contact the seat backrest to be tested;

[0036] The movable false back rotates by a designed angle in a raised state in a direction away from the fixed false back;

[0037] The movable false back is pressed down to contact the surface of the seat backrest to be tested and a set pressure is applied;

[0038] The movable false back rotates by a designed angle in the direction of the fixed false back in a pressurized state and returns to be parallel to the longitudinal plane of the seat backrest to be tested;

[0039] The movable false back is lifted and reset to the initial position.

[0040] The beneficial effects brought by the technical solution provided by the embodiment of the present application include:

[0041] By placing the seat back to be tested into the seat installation station, clamping the seat back to be tested with a fixed false back, then using the control cabinet 6 to supply energy to the adjustment mechanism, switching the state of the movable false back to lift or clamp the seat back to be tested, and driving the movable false back to move towards or away from the fixed false back, and enabling the control cabinet 6 to drive the adjustment mechanism to apply different pressures to the seat back to be tested through a force sensor, thereby conducting a durability test on the automotive seat back with an airbag, the problem of being difficult to conduct a durability performance test on an automotive seat with an airbag in the early stage of production and evaluating the durability performance of the automotive seat with an airbag is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0043] Figure 1 It is the overall structure diagram of a durability test device for an automotive seat back with an airbag in the present application;

[0044] Figure 2 It is the structural schematic diagram of the adjustment mechanism in the present application;

[0045] Figure 3 It is the state schematic diagram of the reciprocating motion of the seat back to be tested in a durability test method for an automotive seat back with an airbag in the present application;

[0046] In the figure: 1, seat fixing frame; 2, gantry; 21, connecting cross arm; 211, connecting vertical arm; 212, limiting arc; 22, arc adjustment seat; 221, angle adjustment plate; 222, locking bolt; 3, fixed false back; 31, bidirectional adjustment rod; 32, fixed seat; 4, movable false back; 5, auxiliary column; 51, swing cylinder; 52, rotating arm; 521, lifting cylinder; 522, positioning pin; 53, rotating shaft; 6, control cabinet; 7, seat back to be tested. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0047] In order to enable those skilled in the art to better understand the solution of the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0048] The embodiment of the present application provides a durability test device for an automotive seat back with an airbag, which can solve the problem of difficultly conducting durability performance tests on automotive seats with airbags in the early stage of production and evaluating the durability performance of automotive seats with airbags.

[0049] Referring to Figure 1 , a durability test device for an automotive seat back with an airbag disclosed in the present application includes a seat fixing frame 1, a gantry 2, a movable false back 4, an adjusting mechanism, a force sensor, and a control cabinet 6. The seat fixing frame 1 is fixed on the ground so that the backrest end of the seat back 7 to be tested can be placed flat on the seat fixing frame 1. A fixed false back 3 is provided on the gantry 2. The fixed false back 3 is located above the seat fixing frame 1 and cooperates with the seat fixing frame 1 below to clamp the seat back 7 to be tested, thereby forming a seat installation station. The adjusting mechanism is connected to the gantry 2 and the movable false back 4 to drive the movable false back 4 to approach or move away from the seat fixing frame 1 to clamp or release the seat back 7 to be tested. The force sensor can detect the pressure exerted by the movable false back 4 on the seat back 7 to be tested. By repeatedly clamping and releasing the surface of the seat back 7 to be tested and cooperating with the force sensor to detect the clamping pressure, the durability performance of the seat back 7 to be tested is detected. The control cabinet 6 is connected to the adjusting mechanism and the force sensor to supply energy to the adjusting mechanism and the force sensor, solving the problem of difficultly conducting durability performance tests on automotive seats with airbags in the early stage of production and evaluating the durability performance of automotive seats with airbags.

[0050] Referring to Figure 1 and Figure 2, a connecting cross arm 21 is provided on the gantry 2, a connecting vertical arm 211 is vertically connected to the connecting cross arm 21, and the fixed false back 3 is arranged at one end of the connecting vertical arm 211 away from the connecting cross arm 21. In order to facilitate the adjustment of the installation pitch angle of the fixed false back 3, an angle adjustment mechanism is also installed on the gantry 2. The angle adjustment mechanism includes: an arc adjustment seat 22, an angle adjustment plate 221, a locking bolt 222 and a locking nut. The arc adjustment seat 22 is arranged in an arc shape, and the radial edge of the arc adjustment seat 22 is fixed to the middle of the gantry 2 by bolts, so that after the arc adjustment seat 22 is installed, it is perpendicular to the length direction of the gantry 2; a receiving groove is opened in the thickness direction of the arc adjustment seat 22, and the angle adjustment plate 221 is movably inserted into the receiving groove. An arc groove is opened along the circumference of the arc adjustment seat 22 on the arc adjustment seat 22, and a positioning convex block is arranged on the angle adjustment plate 221 corresponding to the size of the arc groove. The positioning convex block slides in the arc groove, so that the angle adjustment plate 221 can slide along the circumference of the arc adjustment seat 22, and then the overall pitch angle of the fixed false back 3 and the movable false back 4 arranged on the connecting cross arm 21 is adjusted. The locking bolt 222 passes through the arc adjustment seat 22 and the angle adjustment plate 221 at the same time, and the locking nut is threadedly connected to the protruding end of the locking bolt 222. After the angle adjustment plate 221 is adjusted to the appropriate angle, tightening the locking nut can lock the position of the angle adjustment plate 221. The structure is simple and easy to use.

[0051] Further, in order to make the fixed false back 3 fit the surface of the seat back 7 to be measured more closely, the fixed false back 3 is rotatably connected to the connecting vertical arm 211. One end of the two-way adjusting rod 31 is rotatably connected to the fixed false back 3 away from the connecting cross arm 21, and one end of the two-way adjusting rod 31 away from the fixed false back 3 is rotatably connected to the fixed seat 32. When clamping the surface of the seat back 7 to be measured, by moving the position of the fixed seat 32 on the ground, the inclination angle of the fixed false back 3 can be adjusted through the two-way adjusting rod 31, and then it can fit the surface of the seat back 7 to be measured more closely, so as to clamp the surfaces of seat backs 7 with different thicknesses to be measured and improve the practicability of the overall device.

[0052] The adjustment mechanism includes a first sub-adjustment mechanism and a second sub-adjustment mechanism. The first sub-adjustment mechanism is inserted through the connecting cross arm 21 and connected to the movable false back 4 to drive the movable false back 4 to rotate in the vertical plane, and then switch the clamping or loosening of the surface of the seat back 7 to be measured by the movable false back 4; the second sub-adjustment mechanism is connected to the first sub-adjustment mechanism and is used to drive the first sub-adjustment mechanism to move, so that the movable false back 4 can rotate in the horizontal plane to change the clamping angle between the movable false back 4 and the surface of the seat back 7 to be measured below.

[0053] The first sub-adjusting mechanism includes a rotating arm 52, a rotating shaft 53 and a lifting cylinder 521. One end of the rotating shaft 53 is rotatably connected to the end of the movable false back 4, and the other end of the rotating shaft 53 passes through the connecting cross arm 21 and is connected to the rotating arm 52. The lifting cylinder 521 is mounted on the rotating arm 52 by bolts, and the piston rod of the lifting cylinder 521 is rotatably connected to the movable false back 4. The lifting cylinder 521 is connected to the control cabinet 6. In the embodiment of the present application, the control cabinet 6 specifically uses a pneumatic control cabinet to supply air to the lifting cylinder 521, so that the lifting cylinder 521 drives the movable false arm to lift or lower. The force sensor is specifically arranged at one end of the piston rod of the lifting cylinder 521 in contact with the seat back 7 to be tested, so as to record the pressing force of the lifting cylinder 521 on the seat back 7 to be tested. In an embodiment of the present application, the force sensor is connected to the control cabinet 6 to display the pressure value on the display screen of the control cabinet 6 in real time.

[0054] The second sub-adjusting mechanism includes a rotating bearing, a swing cylinder 51 and an auxiliary column 5. The rotating shaft 53 is connected to the connecting cross arm 21 through the rotating bearing, so that the rotating shaft 53 can rotate along its own axis. The auxiliary column 5 is arranged beside the seat fixing frame 1 to provide an installation position for the swing cylinder 51. The swing cylinder 51 is fixed on the auxiliary column 5 by bolts, and the piston rod of the swing cylinder 51 is rotatably connected to the rotating arm 52. The reciprocating direction of the swing cylinder 51 is perpendicular to the axis of the fixed false back 3. Therefore, the piston rod of the swing cylinder 51 can drive the rotating arm 52 to swing in the horizontal direction during the reciprocating process, so as to drive the movable false back 4 to rotate left and right in the horizontal direction of the fixed false back 3, thereby adjusting the clamping angle between the movable false back 4 and the seat back 7 to be tested, and realizing the clamping of the seat back 7 to be tested from multiple angles.

[0055] Further, in order to limit the rotation angle of the movable false back 4, a limiting arc 212 is also opened on the connecting cross arm 21, and a positioning pin 522 is arranged on the rotating arm 52. The positioning pin 522 is inserted into the limiting arc 212, thereby limiting the rotation angle of the movable false back 4 through the positioning pin 522, limiting the rotation angle with a simple mechanical structure, locking the rotation angle during the whole test process, and making it more convenient to use.

[0056] Based on the above-mentioned automobile seat back durability test device with an airbag, the present application also proposes an automobile seat back durability test method with an airbag, which specifically includes the following steps:

[0057] S1: Install the seat back 7 to be tested in the seat installation position of the automobile seat back durability test device with an airbag;

[0058] S2: Control the adjusting mechanism to drive the movable false back 4 to reciprocate according to a preset number of times. The reciprocating motion includes: approaching the seat fixing bracket 1 to clamp the seat backrest 7 to be tested and then moving away from the seat fixing bracket 1 to release the seat backrest 7 to be tested.

[0059] Further, referring to Figure 3 , the reciprocating motion specifically includes the following five actions:

[0060] A: The axis of the movable false back 4 is parallel to the longitudinal plane of the seat backrest 7 to be tested. At this time, the movable false back 4 is in the raised state and does not contact the seat backrest 7 to be tested.

[0061] B: The movable false back 4 rotates by a designed angle in the raised state in the direction away from the fixed false back 3.

[0062] In the embodiment of the present application, the designed angle is specifically set to 45°. In other application embodiments, the designed angle can be replaced with other designed angles according to actual detection requirements.

[0063] C: The movable false back 4 is pressed down to contact the surface of the seat backrest 7 to be tested and a set pressure is applied so that the movable false back 4 cooperates with the seat fixing bracket 1 to clamp the surface of the seat backrest 7 to be tested.

[0064] In the embodiment of the present application, the set pressure is specifically set to 30 kg. In other application embodiments, the set pressure can also be modified according to the theoretical tolerance of different seat backrests 7 to be tested.

[0065] D: The movable false back 4 rotates by a designed angle in the pressing state in the direction close to the fixed false back 3 to restore the state parallel to the longitudinal plane of the seat backrest 7 to be tested.

[0066] E: The movable false back 4 is lifted and reset to the initial position.

[0067] In the actual test process, one reciprocating motion cycle is in the order of A - E. In the embodiment of the present application, the preset number of times is set to 30,000 times, and 30,000 cycles are performed to verify the durability of the seat backrest 7 to be tested. In other embodiments, different preset numbers of times can also be modified to detect the durability of the seat backrest 7 to be tested.

[0068] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. Unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0069] It should be noted that in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device including the said element.

[0070] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. An endurance test device for an automotive seat back with an airbag, characterized in that, It includes: Seat fixing frame (1); A gantry (2), wherein a fixed false back (3) is arranged on the gantry (2), and the fixed false back (3) is arranged above the seat fixing frame (1) and forms a seat installation station between the fixed false back (3) and the seat fixing frame (1); Active false back (4); An adjustment mechanism, the adjustment mechanism is connected to the gantry (2) and the movable false back (4), and is used to drive the movable false back (4) to move closer to or farther from the seat fixing frame (1) so as to clamp or release the seat back (7) to be tested; A force sensor, which is used to detect the pressure applied by the movable false back (4) to the seat back (7) to be tested; And, a control cabinet (6), wherein the control cabinet (6) is connected to the adjustment mechanism and the force sensor.

2. The vehicle seat back durability test device with airbag according to claim 1, characterized in that: The gantry (2) is provided with a connecting horizontal arm (21), the connecting horizontal arm (21) is vertically connected with a connecting vertical arm (211), and the fixed false back (3) is arranged at one end of the connecting vertical arm (211) away from the connecting horizontal arm (21).

3. The durability test device for an automobile seat back with an airbag according to claim 2, characterized in that The regulating mechanism comprises: A first sub-adjustment mechanism, which is passed through the connecting cross arm (21), the first sub-adjustment mechanism is connected to the movable false back (4), and is used to drive the movable false back (4) to rotate in a vertical plane; The second sub-adjusting mechanism is connected to the first sub-adjusting mechanism and is used to drive the first sub-adjusting mechanism to move so as to make the movable false back (4) rotate in a horizontal plane.

4. The durability test device for an automobile seat back with an airbag according to claim 3, characterized in that, The first sub-regulatory mechanism includes: A rotating arm (52); A rotating shaft (53), one end of which passes through the connecting cross arm (21) and is fixed on the rotating arm (52), and the other end of which is rotatably connected to the end of the movable false back (4); And, a lifting cylinder (521) is installed on the rotating arm (52), one end of which is rotatably connected to the movable dummy back (4) and is used to drive the movable dummy back (4) to swing in a vertical plane.

5. The endurance test device for an automotive seat back with an airbag according to claim 4, characterized in that, The second sub-regulatory mechanism includes: A rotating bearing, wherein the rotating shaft (53) is fixed to the connecting cross arm (21) via the rotating bearing; A swing cylinder (51) connected to the rotating arm (52) and used to drive the rotating arm (52) to move so that the movable false back (4) swings in a horizontal plane; And, an auxiliary column (5), the swing cylinder (51) is fixedly connected to the rotating arm (52), and the swing cylinder (51) is rotatably connected to the auxiliary column (5).

6. The vehicle seat back durability test device with airbag according to claim 5, characterized in that: A limiting circular arc (212) is provided on the connecting horizontal arm (21), and a positioning pin (522) is provided on the rotating arm (52), and the positioning pin (522) is inserted into the limiting circular arc (212).

7. The durability test method for a car seat back with an airbag according to claim 2, characterized in that: The fixed false backrest (3) is rotatably arranged on the connecting vertical arm (211), and one end of the fixed false backrest (3) away from the connecting vertical arm (211) is connected with a fixed seat (32) through a double hinge rod (31).

8. The durability test device for an automotive seat back with an airbag according to claim 2, characterized in that It further includes an angle adjustment mechanism, and the angle adjustment mechanism includes: An arc-shaped adjustment seat (22), the arc-shaped adjustment seat (22) is installed on the gantry (2), and an arc groove is formed on the arc-shaped adjustment seat (22); An angle adjustment plate (221), a positioning convex block is arranged on the angle adjustment plate (221), the positioning convex block is slidably arranged in the arc groove, and one end of the angle adjustment plate (221) away from the arc-shaped adjustment seat (22) is connected with the connecting cross arm (21); A locking bolt (222), the locking bolt (222) passes through the arc-shaped adjustment seat (22) and the angle adjustment plate (221) at the same time; And a locking nut, the locking nut is threadedly connected to the protruding end of the locking bolt (222).

9. A durability test method for an automotive seat back with an airbag, characterized in that, It includes: Install the seat backrest to be tested (7) at the seat installation station of the automotive seat backrest durability test device with an airbag according to any one of claims 1-8 above; Control the adjustment mechanism to drive the movable false backrest (4) to reciprocate according to a preset number of times; The reciprocating motion includes: approaching the seat fixing frame (1) to clamp the seat backrest to be tested (7) and then moving away from the seat fixing frame (1) to release the seat backrest to be tested (7).

10. A durability test method for an automotive seat back with an airbag according to claim 9, characterized in that, The reciprocating action further includes: The axis of the movable false backrest (4) is parallel to the longitudinal plane of the seat backrest to be tested (7), and at this time the movable false backrest (4) does not contact the seat backrest to be tested (7); The movable false backrest (4) rotates by a designed angle in the direction away from the fixed false backrest (3) in a lifted state; The movable false backrest (4) is pressed down to contact the surface of the seat backrest to be tested (7) and apply a set pressure; The movable false backrest (4) rotates by a designed angle in the direction of the fixed false backrest (3) under the pressure application state and returns to be parallel to the longitudinal plane of the seat backrest to be tested (7); The movable false backrest (4) is lifted and reset to the initial position.

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