Vehicle seat

Abstract

The present invention relates to a vehicle seat (1) in which the seat (1a) and backrest (1b) are pivotally connected to each other via an accessory system (2). The vehicle seat (1) has an angle measuring system (5) with a sensor device (9) by which the tilt adjustment amount of the backrest (1b) relative to the seat (1a) can be determined. According to the present invention, the angle measuring system (5) has a seat-side displacement mechanism (6) and a backrest-side displacement mechanism. The seat-side displacement mechanism (6) has a seat-side displacement element (6a) disposed in a manner that can move along a first displacement direction (R6), and the backrest-side displacement mechanism (7) has a backrest-side displacement element (7a) disposed in a manner that can move along a second displacement direction (R7). The displacement elements are pivotally coupled to each other at a rotation point (D), so that when the backrest (1b) is tilted, the angle (α) between the two displacement elements (6a, 7a) changes, and the sensor device (9) is configured to output a sensor signal (9S) based on the angle (α).

Description

Technical Field

[0001] The present invention relates to a vehicle seat according to the preamble of claim 1. Background Technology

[0002] Vehicle seats with a seat and backrest typically include a tilt adjustment mechanism that allows the backrest to pivot to various positions. This pivoting movement is controlled by an accessory system (also known as a "tilt adjuster") having an accessory portion fixed to the backrest and an accessory portion fixed to the seat, both of which can rotate relative to each other via an eccentric adjustment mechanism. Such accessory systems are illustrated, for example, in patent documents US8146995B2, EP2420403B1, or WO202417138A1.

[0003] Such accessory systems generate an oscillating motion, meaning there is both rotational and translational motion between the two accessory parts or between the back and the seat. Therefore, it is difficult to obtain information about the pure rotational position (e.g., rotation angle) of the back relative to the seat or reference position simply by measuring the rotational position between the two accessory parts, because the translational component also affects the measurement results of the corresponding rotation sensor between the two accessory parts. Patent document US10358053B2 proposes a method for determining the rotational position of the back via a rotation sensor that measures the rotational position of the regulating motor driving the adjustment mechanism of the accessory system. Summary of the Invention

[0004] The purpose of this invention is to provide a vehicle seat that can easily and reliably measure the back rotation position.

[0005] The solution of the present invention to achieve the above-mentioned objective is a vehicle seat as described in the independent claim. The dependent claims describe preferred improvements.

[0006] Accordingly, the present invention provides a vehicle seat having a seat and a backrest, wherein the seat is connected to the backrest via an accessory system (preferably a pivoting accessory) such that the backrest can pivot relative to the seat about a pivot axis. Preferably, a so-called pivoting accessory is used as the accessory system, wherein rotational movement about the pivot axis is typically combined with translational movement along the pivot axis, because an eccentric adjustment mechanism is provided between the accessory portion fixed to the seat and the accessory portion fixed to the backrest.

[0007] The vehicle seat also features an angle measurement system with a sensor device configured to generate and output a sensor signal characterizing the amount of tilt adjustment of the backrest relative to the seat. The angle measurement system includes a seat-side displacement mechanism attached to the seat and a back-side displacement mechanism attached to the backrest. The seat-side displacement mechanism has a seat-side displacement element positioned on the seat in a manner capable of moving along a first displacement direction, and the back-side displacement mechanism has a back-side displacement element positioned on the backrest in a manner capable of moving along a second displacement direction different from the first displacement direction.

[0008] Furthermore, it is proposed that the seat-side displacement element and the back-side displacement element are pivotally coupled to each other at the rotation point, for example via a bearing member, so that when the back is tilted relative to the seat, the angle between the two displacement elements changes, thereby changing the orientation of at least one displacement direction or the relative orientation between the displacement directions. The sensor device is also configured to output a sensor signal based on the angle between the two displacement elements.

[0009] Advantageously, this angle measurement system can detect only the relative rotational motion between the displacement elements, and thus, geometrically, only the rotational motion of the backrest about its pivot axis. For example, if translational components are generated in the pivoting motion of the backrest due to the use of a swing-type fitting, these translational components are filtered out by the longitudinal displacement capability of the displacement elements of the seat or backrest, and only the rotational component in the motion is detected and converted into rotation about the pivot point. By correspondingly calibrating or knowing the installation orientation, the tilt adjustment of the backrest can be considered geometrically, thus allowing the rotational position of the backrest to be determined easily and reliably. This is because when the backrest is adjusted relative to the seat, the angular change between the two displacement elements is the same as the angular change of the backrest relative to the seat. By corresponding initialization or calibration, and considering the installation orientation of the displacement elements, the rotational position of the backrest can be easily inferred.

[0010] Preferably, the seat-side displacement mechanism has a guide element fixed to the seat, and the seat-side displacement element is disposed within the guide element fixed to the seat in a manner capable of longitudinal displacement; and the back-side displacement mechanism has a guide element fixed to the back, and the back-side displacement element is disposed within the guide element fixed to the back in a manner capable of longitudinal displacement. "Fixed to the seat" or "fixed to the back" means that the corresponding guide element is fixed in position, i.e., it can only rigidly move with the seat or back. Conversely, "seat-side" or "back-side" means that although the corresponding displacement element is associated with the seat or back, it can still move relative to the seat or back. In this sense, "capable of longitudinal displacement" means that the displacement element can move along its longitudinal extension direction, i.e., it can move relative to the guide element fixed in the corresponding position along the corresponding displacement direction.

[0011] In this way, the corresponding displacement elements can be guided accordingly, thereby defining the movement in the corresponding guidance direction. According to one possible implementation, the first displacement direction of the seat-side displacement element is located at or at least parallel to the longitudinal axis of the seat; and / or the second displacement direction of the back-side displacement element is located at or at least parallel to the longitudinal axis of the back.

[0012] This advantageously determines the installation orientation, allowing for a clear deduction of the back angle relative to the seat from a geometric perspective, based on the angle between the two displacement elements, especially after pre-initialization. This simplifies the work required to determine the back tilt adjustment. Furthermore, the elongated displacement elements are guided along their longer longitudinal axis, thus simplifying assembly and optimizing space utilization.

[0013] According to another embodiment, the orientation-fixed guide element can also be arranged at the seat or back, such that the displacement direction of the longitudinally displaced displacement element therein forms an angle with the longitudinal axis of the seat or back. In this embodiment, the angle of the back relative to the seat can also be clearly deduced based on geometric considerations, particularly after pre-initialization.

[0014] Particularly preferably, the orientation-fixed guide elements are arranged at the seat or back, so that for any possible adjustment of the back relative to the seat, i.e. within the range of adjustment that is possible or permissible in normal operation, there is always an angle between the two displacement elements that is not equal to 0° or not equal to 180° (i.e., the displacement elements are not parallel to each other).

[0015] Preferably, the seat-side displacement element and / or the back-side displacement element are positioned via sliding bearings or rolling bearings with balls or rollers in a manner that allows movement in the respective displacement directions. This ensures simple and reliable movement of the displacement elements to reliably compensate for translational motion.

[0016] Preferably, the sensor device also includes an electronic rotation sensor and / or a tilt sensor, configured to determine the angular value and / or angular change value between displacement elements based on optical and / or mechanical and / or magnetic working principles, and output a sensor signal according to the value. This allows for convenient and continuous detection of angles, and thus continuous detection of the tilt adjustment amount of the back.

[0017] However, it may be proposed, as an addition or alternative, that the sensor device has a control cam fixed to one of the displacement elements (belonging to a displacement mechanism) and a switching member fixed to another displacement element (belonging to another displacement mechanism) and having at least two switching positions, such that when the back pivots relative to the seat, the control cam is adjusted relative to the switching member, wherein the control cam acts on the switching member at least within the angular range between the two displacement elements to set or change the switching position of the switching member; and the sensor device is configured to generate a sensor signal based on the switching position of the switching member.

[0018] This eliminates the need for any additional complex sensing systems and their subsequent electronic evaluation systems. Instead, the configuration of the control cam can be matched to the corresponding vehicle seat, thus allowing for direct, simple, and reliable detection of the adjustment between displacement elements via the switching mechanism (i.e., through its operation) without additional complex evaluation, thereby detecting the amount of backrest tilt adjustment.

[0019] Preferably, the control cam has a control surface, preferably radially outward and / or axially oriented (with respect to the rotation point), wherein the control surface acts on the switching member according to the angle between the two displacement elements, so that the switching member enters, maintains, or changes the switching position. This allows for flexible adjustment of the control surface according to the desired application.

[0020] Preferably, each switching position of the switching member is associated with at least one angle or at least one angle range between the two displacement elements, and each angle or angle range between the two displacement elements is associated with at least one tilt adjustment of the backrest relative to the seat. This allows the corresponding rotational position to be directly inferred from the switching signal of the switching member, thereby simplifying the determination of the backrest tilt adjustment.

[0021] Here, for example, it can be proposed that the switching member has two switching positions, and the control cam is configured (e.g., through the corresponding design of the control surface) such that: - The switching member is not acted upon within a first angular range, or is acted upon in a manner that causes the switching member to enter a first switching position, wherein, within this first angular range, the back is preferably in an upright sitting position; and - The switching member is acted upon in a manner that causes it to enter a second switching position within a second angular range, wherein, within this second angular range, the back is preferably positioned between an upright sitting position and a convenient entry / exit position; and - The switching member is not acted upon within the third angle range, or is acted upon in a manner that causes the switching member to enter the first switching position, wherein the back is located in a convenient entry and exit position within the third angle range.

[0022] In this way, when the second switching position is presented, sensor signals can be used to identify whether the seat is between an upright sitting position and a convenient entry / exit position, for example, because the backrest is correspondingly released. Conversely, when the first switching position is presented, it can be assumed that the backrest is in either a convenient entry / exit position or an upright sitting position. Positioning can be determined based on sensor signals for corresponding subsequent use. To further differentiate, additional switching positions and corresponding additional angle ranges can be set according to the application, where the control cam works in conjunction with the switching mechanism in an application-specific manner. Attached Figure Description

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. In the drawings: Figure 1 A schematic side view of the vehicle seat is shown; Figure 2A and Figure 2B It shows Figure 1 A detailed view of the vehicle seat angle measurement system shown, in which an arrangement different from the first embodiment with sensor devices is adopted; Figure 3A , Figure 3B and Figure 3C It shows Figure 1 The different pivoting positions of the back of the vehicle seat shown are illustrated, in which a second embodiment with a sensor device is adopted; Figure 4A and Figure 4B Other variations of the second implementation of the sensor device are shown. Detailed Implementation

[0024] Figure 1 A vehicle seat 1 with a seat 1a and a backrest 1b is schematically shown, the backrest 1b being pivotable about a pivot axis A relative to the seat 1a. To control the pivoting movement, an accessory system 2 is arranged between the seat 1a and the backrest 1b. This accessory system 2 has an accessory portion 2a fixed to the seat and an accessory portion 2b fixed to the backrest, which are rotatable relative to each other. This rotation is determined by an adjustment mechanism 3, which, for example, has an external gear (not shown) with external teeth and an internal gear (not shown) with internal teeth, the internal gear rotating eccentrically relative to the external gear during manual or mechanical operation. Such eccentric accessory systems 2 are well known to those skilled in the art and will not be described further.

[0025] By using this accessory system 2, when the backrest 1b is pivoted relative to the seat 1a, both rotational motion about the pivot axis A and translational motion along the pivot axis A are generated, i.e., oscillating motion. To obtain reliable values ​​for evaluating or further processing the rotational position of the backrest 1b relative to the seat 1a (this value only characterizes the rotational motion about the pivot axis A), the following reference is used. Figure 2A and Figure 2B The angle measurement system 5 is described above.

[0026] Accordingly, a seat-side displacement mechanism 6 is provided, which is connected to the seat 1a. That is, if the seat 1a is adjustable, the seat-side displacement mechanism and the seat 1a are adjusted in coordination. The seat-side displacement mechanism 6 has a seat-side displacement element 6a, which is guided in a longitudinally displaceable manner by a guide element 6b fixed to the seat (e.g., by a guide element such as a sliding bearing or rolling bearing). The guide element 6b fixed to the seat is fixed to the seat 1a, for example, by a frame structure fixed to the seat 1a.

[0027] In addition, a back-side displacement mechanism 7 is provided, which is connected to the back 1b and adjusts in coordination with the back 1b, especially pivoting with the back 1b. The back-side displacement mechanism 7 has a back-side displacement element 7a, which is guided longitudinally by a guide element 7b fixed to the back (e.g., by a guide element such as a sliding bearing or rolling bearing). The guide element 7b fixed to the back is fixed to the back 1b, for example, by a frame structure fixed to the back 1b.

[0028] For two displacement elements 6a and 7a that are displaceable within guide elements 6b and 7b, with respect to the coordinate system where the vehicle seat is fixed, their corresponding arrangement in the seat 1a and backrest 1b will produce different displacement directions R6 and R7. The first displacement direction R6 and the second displacement direction R7 each depend on the position of the seat 1a (if adjustable) or the backrest 1b. (Refer to...) Figure 2A The displacement mechanisms 6 and 7 are fixed to the seat 1a or the back 1b so that their respective displacement directions R6 and R7 are aligned with or at least parallel to the longitudinal axes L1a and L1b of the seat 1a or the back 1b. Figure 2B In this context, these displacement directions extend at a certain angle to the longitudinal axes L1a and L1b. Here, the longitudinal axes L1a and L1b are the axes of the seat 1a or the back 1b corresponding to its maximum extension direction, such as... Figure 2A and Figure 2B As shown.

[0029] The corresponding displacement elements 6a and 7a are guided within the defined bearing sections B6a and B7a by corresponding guide elements 6b and 7b, for example, as in the manner of a sliding bearing or a rolling bearing with rollers. The two displacement elements 6a and 7a are rotatably coupled to each other at a rotation point D via any bearing member 8 (e.g., via a shaft-like member housed in a bushing), wherein the rotation point D is located outside the corresponding bearing sections B6a and B7a. The pivoting of the back 1b relative to the seat 1a automatically causes the two coupled seat-side displacement elements 6a or back-side displacement elements 7a to pivot relative to each other about the pivot axis D via a guide element 6b fixed to the seat or a guide element 7b fixed to the back, thereby changing the angle α between the displacement elements 6a and 7a as the back 1b is tilted relative to the seat 1a. This is, for example, in… Figure 3A , Figure 3B and Figure 3C The different pivot positions are illustrated in the diagram.

[0030] Accordingly, the position of the rotation point D is independent of the position of the pivot axis A of the seat 1a and the back 1b. Instead, the position of the pivot axis A relative to the rotation point D changes due to the translational movement of the accessory system 2. In this translational movement, the displacement elements 6a and 7a move relative to their respective guide elements 6b and 7b along the displacement directions R6 and R7, so that this translational movement is not transmitted to the rotation point D, but is almost filtered out or compensated. Only the rotational component is transmitted to the displacement elements 6a and 7a through the corresponding pivoting of the guide elements 6b and 7b. The relative rotational movement between the two displacement mechanisms 6 and 7, or the change in the angle α between the displacement elements 6a and 7a, can be determined by means of the angle measurement system 5 described below.

[0031] Accordingly, refer to Figure 2A and Figure 2B In the illustrated embodiment, a sensor device 9 is provided near the rotation point D. This sensor device 9 is configured to detect the rotational movement between the seat-side displacement element 6a and the back-side displacement element 7a, and thereby detect the angle α or the change in angle α. For this purpose, the sensor device 9 can, for example, be an electronic rotation sensor or a tilt sensor. Based on optical and / or mechanical and / or magnetic operating principles, the sensor device can determine the value of the angle α between the displacement elements 6a and 7a, or the change in angle α, and output it along with a sensor signal 9S for further processing. In this way, for example after a corresponding preliminary calibration or initialization (depending on the orientation or relative orientation of the displacement elements 7a and 7b at the seat 1a or back 1b), the tilt adjustment amount of the back 1b (excluding the translation component) can be continuously detected from the sensor signal 9S, and this information can be subsequently utilized accordingly.

[0032] The principle utilized here is that when the backrest 1b is adjusted relative to the seat 1a, the change in angle α of the two displacement elements 7a and 7b is the same as the change in angle α of the backrest 1b relative to the seat 1a. During initialization or calibration, the constants determined by the orientation of the displacement elements 7a and 7b at the seat 1a and backrest 1b are also known. Through these constants, the measured change in angle α can be explicitly converted into the angle between the backrest 1b and the seat 1a (angle between the backrest 1b and the seat 1a = constant + measured change in angle α between displacement elements 7a and 7b).

[0033] exist Figure 3A , Figure 3B , Figure 3C In an alternative embodiment of the sensor device 9 shown, the control cam 10 is fixed to one of the displacement elements 7a, 6a (schematically represented in the figure by pillars fixed in corresponding positions), and the switching member 11 is fixed to the other displacement element 6a, 7a (also schematically represented in the figure by pillars fixed in corresponding positions). Therefore, when the back 1b pivots relative to the seat 1a, the control cam 10 and the switching member 11 also rotate relative to each other.

[0034] The switching member 11 has at least two switching positions S: S1, S2, etc. The control cam 10 is designed to bring the switching member 11 into different switching positions S according to the value of angle α, wherein each switching position S is associated with a specific angle α or a specific angle range dα of angle α. The control cam 10 and the switching member 11 are attached to corresponding displacement elements 6a, 7a, so translational motion has been filtered out here.

[0035] The control cam 10 has an outer control surface 10a for associating the switching position S with an angle α or an angle range dα. The control surface works in conjunction with the switching member 11 as follows: For example, when the switching component 11 has two switching positions S, namely the inactive first switching position S1 and the activated second switching position S2, such as... Figure 3AAs shown, the control cam 10 either does not act on the switching member 11 or acts in a manner that places the switching member 11 in the first switching position S1 (not operated) within the first angular range dα1 of angle α. Within the second angular range dα2 of angle α, the control cam 10 acts on the switching member 11 in a manner that places the switching member 11 in the second switching position S2 (operated). Within the third angular range dα3 of angle α, the control cam 10 acts on the switching member 11 in a manner that places the switching member 11 back in the first switching position S1 (not operated). For this purpose, the radially outward control surface 10a is provided, for example, with two edge-side steps 10b or edges to ensure switching within the corresponding angular range. Alternatively or additionally, depending on the arrangement of the switching member 11, the control surface 10a may extend in the axial direction (about the rotation point D).

[0036] In the illustrated embodiment, the first angle range dα1 of angle α is associated with the upright sitting position of the back 1b, while the second angle range dα2 of angle α is associated with the intermediate position during the process of the back 1b folding to the convenient entry / exit position. The convenient entry / exit position is achieved within the third angle range dα3 of angle α. Based on the switching position S of the switching member 11, the current position of the back 1b can be easily identified for the corresponding configuration of the control cam 10. The switching position S can be processed or encoded accordingly in the output sensor signal 9S, thereby determining the tilt adjustment amount (excluding translation component) of the back 1b for the corresponding configuration of the control cam 10, and subsequently utilizing this information.

[0037] When the switching member 11 has two or more switching positions S and, for example, has stepless adjustment capability, it can determine another angle range dα or even a single angle α or a change in angle α, and output it in the sensor signal 9S. For this purpose, the outer control surface 10a is correspondingly arranged in multiple levels (see...). Figure 4A ) or has a corresponding continuously rising ramp (see Figure 4B This allows for corresponding (multi-level or continuous) interactions with the corresponding design (multi-level or continuous operation) switching component 11.

[0038] By employing all the aforementioned angle α sensing types, the translational component of the swing motion of the accessory system 2 is filtered out, thus only the rotational motion of the accessory parts 2a, 2b, or the back 1b relative to the seat 1a is detected. Therefore, the tilt adjustment amount of the back 1b (excluding the translational component) can be accurately detected from the sensor signal 9S, and this information can be subsequently utilized accordingly.

[0039] List of reference numerals 1 Vehicle Seat 1a Seat 1b back 2. Accessory System 2a Accessories fixed to the base 2b is attached to the accessory section on the back. 3 Adjustment Mechanism 5-Angle Measurement System 6-seat side displacement mechanism 6a Seat Side Displacement Element 6b Guide element fixed to the base 7 Back Lateral Displacement Mechanism 7a Backside Displacement Element 7b Guide element fixed to the back 8 bearing components 9 sensor devices 9S sensor signal 10 control cams 10a control surface 10b steps 11 Switching Components The angle between α displacement elements 6a and 7a A pivot axis B6a seat side displacement element 6a bearing section B7a back side displacement element 7a bearing section D Rotation point dα angle α range The first angular range of dα1 angle α The second angular range of dα2 angle α The third angle range of dα3 angle α Longitudinal axis of L1a seat 1a The longitudinal axis of L1b back 1b The first displacement direction of the R6 seat side displacement element 6a relative to the guide element 6b fixed to the seat. The second displacement direction of the R7 back lateral displacement element 7a relative to the guide element 7b fixed to the back. S-switching component 11 switching position S1 First Switching Position S2 Second Switching Position

Claims

1. A vehicle seat (1) having a seat portion (1a) and a back portion (1b), wherein The seat (1a) is connected to the back (1b) via a fitting system (2) such that the back (1b) can pivot about a pivot axis (S) relative to the seat (1a); The vehicle seat (1) also includes an angle measurement system (5) with a sensor device (9), wherein the sensor device (9) is configured to generate and output a sensor signal (9S) that characterizes the amount of tilt adjustment of the backrest (1b) relative to the seat (1a). Its features are, The angle measuring system (5) has a seat side displacement mechanism (6) attached to the seat (1a) and a back side displacement mechanism (7) attached to the back (1b), wherein the seat side displacement mechanism (6) has a seat side displacement element (6a) disposed on the seat (1a) in a manner that can move along a first displacement direction (R6), and the back side displacement mechanism (7) has a back side displacement element (7a) disposed on the back (1b) in a manner that can move along a second displacement direction (R7). The seat-side displacement element (6a) and the back-side displacement element (7a) are pivotally coupled at a rotation point (D) so that when the back (1b) is tilted relative to the seat (1a), the angle (α) between the two displacement elements (6a, 7a) changes, and the sensor device (9) is configured to generate and output the sensor signal (9S) based on the angle (α) between the two displacement elements (6a, 7a).

2. The vehicle seat (1) according to claim 1. Its features are, The seat-side displacement mechanism (6) has a guide element (6b) fixed to the seat, and the seat-side displacement element (6a) is disposed in the guide element (6b) fixed to the seat in a manner capable of longitudinal displacement; and The back-side displacement mechanism (7) has a guide element (7b) fixed to the back, and the back-side displacement element (7a) is disposed in the guide element (7b) fixed to the back in a manner that allows for longitudinal displacement.

3. The vehicle seat (1) according to claim 1 or 2. Its features are, The first displacement direction (R6) of the seat-side displacement element (6a) is located or at least parallel to the longitudinal axis (L1a) of the seat (1a); and / or The second displacement direction (R7) of the back side displacement element (7a) is located or at least parallel to the longitudinal axis (L1b) of the back (1b).

4. The vehicle seat (1) according to claim 1 or 2. Its features are, The first displacement direction (R6) of the seat-side displacement element (6a) forms an angle with the longitudinal axis (L1a) of the seat (1a); and / or The second displacement direction (R7) of the back side displacement element (7a) forms an angle with the longitudinal axis (L1b) of the back (1b).

5. The vehicle seat (1) according to any one of the preceding claims. Its features are, The seat-side displacement element (6a) and / or the back-side displacement element (7a) are positioned by means of sliding bearings or rolling bearings in a manner that allows them to move along their respective displacement directions (R6, R7).

6. The vehicle seat (1) according to any one of the preceding claims. Its features are, The sensor device (9) has an electronic rotation sensor and / or tilt sensor, which is configured to determine the value of the angle (α) and / or angle (α) change between the displacement elements (6a, 7a) based on optical and / or mechanical and / or magnetic working principles, and output the sensor signal (9S) accordingly.

7. The vehicle seat (1) according to any one of the preceding claims. Its features are, The sensor device (9) has a control cam (10) fixed to one of the displacement elements (7a, 6a) and a switching member (11) fixed to the corresponding other displacement element (6a, 7a) and having at least two switching positions (S) to adjust the control cam (10) relative to the switching member (11) when the back (1b) pivots relative to the seat (1a); The control cam (10) acts on the switching member (11) at least within each angular range (dα) of the angle (α) between the two displacement elements (6a, 7a) to set or change the switching position (S) of the switching member (11); and The sensor device (9) is configured to generate the sensor signal (9S) based on the switching position (S) of the switching member (11).

8. The vehicle seat (1) according to claim 7. Its features are, The control cam (10) has a control surface (10a), preferably a radially outward and / or axially oriented control surface, wherein the control surface (10a) acts on the switching member (11) according to the angle (α) between the two displacement elements (6a, 7a) to cause the switching member (11) to enter the corresponding switching position (S) or maintain the switching position (S) or change the switching position (S).

9. The vehicle seat (1) according to claim 7 or 8. Its features are, Each switching position (S) of the switching member (11) is associated with at least one angle (α) or at least one angle range (dα) between the two displacement elements (6a, 7a), and each angle (α) or each angle range (dα) between the two displacement elements (6a, 7a) is associated with at least one tilt adjustment of the back (1b) relative to the seat (1a).

10. The vehicle seat (1) according to any one of claims 7 to 9. Its features are, The switching member (11) has two switching positions (S; S1, S2), and the control cam (10) is configured such that: - The switching member (11) is not acted upon within a first angle range (dα1) of angle (α), or is acted upon in a manner that causes the switching member (11) to enter a first switching position (S1); and - The switching member (11) is acted upon in a manner that causes the switching member (11) to enter the second switching position (S2) within the second angle range (dα2) of the angle (α); and - The switching member (11) is not acted upon within the third angle range (dα3) of the angle (α), or the switching member (11) is acted upon in a manner that causes the switching member (11) to enter the first switching position (S1).

11. The vehicle seat (1) according to claim 10. Its features are, The back (1b): - Within the first angular range (dα1) of angle (α), the patient is in an upright sitting position; - Within the second angular range (dα2) of angle (α), it lies between the upright sitting position and the convenient entry / exit position; and - It is located in a convenient access position within the third angular range (dα3) of angle (α).

12. The vehicle seat (1) according to any one of the preceding claims. Its features are, The accessory system (2) is designed with, for example, an accessory part (2a) fixed to the seat, an accessory part (2b) fixed to the back, and an adjustment mechanism (3) for controlling the relative rotation of the accessory parts (2a, 2b), such that the back (1b) and the seat (1a) pivot relative to each other in a swinging motion.

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