Device for seat adjustment of a seat and fitting assembly for such a device

Abstract

The utility model relates to a device for adjusting a seat (2), the seat is provided with a sitting part (4) and a backrest (6), the backrest can be adjusted between two final positions by means of an adjusting mechanism, namely between a vertical normal position and a folded position, the adjusting mechanism is provided with opposite rotating accessories (8), the rotating accessories are connected with each other through a shaft (10), and the rotating accessories are connected with the sitting part (4) through the shaft (10). The shaft is rotatable about an axis (12) of the shaft and extends along the axis (12) of the shaft in a longitudinal direction (L). Furthermore, a device for detecting two final positions is provided, which device has a spindle (24) connected to the shaft (10) and a spindle nut, which is displaced in translation in the longitudinal direction (L) when the shaft (10) is rotated, said spindle nut being part of a driver (26) having an actuating element (30) for a limit switch (32). According to the invention, the driver (26) is forcibly guided by means of a mechanical slotted guide (48) in such a way that a rotational movement of the driver (26) is superimposed on the translational movement, and the slotted guide (48) is designed in such a way that the actuating element (30) actuates the limit switch (32) in both final positions. Preferably, the locking mechanism (16) is also unlocked at the same time in order to turn over the foldable backrest.

Description

Technical Field

[0001] The utility model relates to a device for adjusting a seat, in particular a vehicle seat, and an assembly component for the device. Background Art

[0002] A seat is particularly a seat in a vehicle, in particular a seat of the second or third seat row. The seat is particularly a folding seat having a seating portion and a backrest that can be folded relative to the seating portion. The backrest is typically pivotable between two final positions: an upright normal position, also referred to as a comfort position, and a folded position, also referred to as a load floor position. In the folded position, the backrest is often oriented essentially horizontally. To adjust the backrest, such seats usually have an adjustment mechanism. The backrest is generally fastened via the adjustment mechanism so that it can pivot. For this purpose, a pivoting fastening point is provided, which, without limiting the generality, will be referred to below as a pivoting attachment.

[0003] Typically, two opposing rotating parts are provided, connected to each other via a shaft. The shaft serves as a drive shaft and also synchronizes the adjustment movements of the two rotating parts. This shaft defines the shaft axis, which is often also the pivot axis. The shaft axis is often not stationary but rather performs a typically oscillating motion during the pivoting movement.

[0004] In the case of backrest adjustments driven by electric motors, a system for detecting the end position is typically provided to protect the drive motor, in order to stop the drive motor in good time and protect it from overload.

[0005] DE 10 2004 061 960 A1 discloses a seat with an electrically adjustable backrest, in which the end positions are detected by means of two limit switches. To actuate the two limit switches, a spindle with a spindle nut is mounted on a shaft. The spindle nut has radially projecting switching cams that can be displaced translationally between the two end positions in order to actuate the two oppositely arranged limit switches.

[0006] A headrest is typically fastened to the backrest, often in the form of a foldable headrest. The headrest can be folded from a normal operating position (in which it is positioned to protect the passenger) into a folded position. This folded position typically corresponds in particular to the folded position of the backrest. In the operating position, the headrest is locked and secured by a releasable locking mechanism. Therefore, in order to fold into the folded position, the locking mechanism must be released.

[0007] In automatic, electrically driven backrest adjustments, the adjustment mechanisms are often complex and expensive and require a large amount of installation space in order to be able to perform these various functions. Utility Model Content

[0008] Based on this, the object of the present invention is to enable a seat adjustment, in particular an electrically driven, automatic backrest adjustment, to be realized in a low-effort, space-saving and cost-effective manner.

[0009] According to a first aspect of the present invention, this object is achieved by means of a device for adjusting a seat, in particular a foldable vehicle seat, comprising a seating part and a backrest that can be adjusted between two end positions, namely, an upright normal position and a folded position that can be tilted, by means of an adjustment mechanism. The adjustment mechanism in particular comprises an electric drive motor for automatic adjustment. Furthermore, the adjustment mechanism comprises opposing pivoting fittings, via which the backrest is pivotally fastened to the seating part or to a retaining structure, for example. The pivoting fittings are connected to one another via a shaft that is rotatable about its axis and extends in the longitudinal direction along its axis.

[0010] The device also includes a device for detecting two final positions, wherein the device includes a spindle and a spindle nut connected to the shaft in a rotationally fixed manner, and the spindle nut is displaced translationally in the longitudinal direction when the shaft rotates. The spindle nut is part of a driver, which has an actuating element for actuating a limit switch. The driver is positively guided by means of a mechanical guide, more precisely, such that a rotational movement is superimposed on the translational movement of the spindle nut and thus the driver. The guide is designed such that the actuating element actuates the limit switch in both final positions, more specifically, such that a switching signal is generated when the respective final position is approached.

[0011] Actuating the limit switch here means that the actuating element moves relative to the limit switch, causing the limit switch to perform a mechanical adjustment movement and, in particular, to be shifted into another switching state. To this end, the actuating element is either guided away from the limit switch or pressed against it. Between the two end positions, the limit switch is preferably not influenced by the actuating element, i.e., not actuated.

[0012] A particular advantage of this design is that only a single limit switch is required and provided, which is then actuated only when one of the two end positions is reached. The actuating element for actuating the limit switch is thus rotated relative to the limit switch due to the superimposed rotational movement, in order to thereby actuate the limit switch.

[0013] The task is solved according to the second aspect of the utility model also through the device for seat adjustment of the seat, the seat can also be adjusted between two final positions by the adjusting mechanism. The headrest is fastened at the backrest, the headrest can be folded from the operating position to the folded position, wherein the headrest can be locked in the operating position by the releasable locking mechanism, so that the headrest is locked in the normal operating position especially anti-collision. When the locking mechanism is released, the folding of the headrest into the folded position is supported or executed at least by the spring mechanism or the motor type driver.

[0014] In order to release the locking mechanism so that the folding of the headrest can be realized, the driving element connected with the shaft is provided, the driving element implements the rotary motion around the axis of the shaft when the shaft rotates. The control element in the form of a cable and preferably curved flexible is fastened at the driving element, in order to manipulate the locking mechanism, especially to unlock the locking mechanism, the control element is connected with the locking mechanism, more specifically, the connection is such that the manipulation of the locking mechanism, especially the unlocking, is realized automatically via the control element when the backrest is adjusted. By the rotary motion of the driving element, the control element is displaced and thus the adjustment stroke is applied to the locking mechanism, so that the locking mechanism is released. In particular, the control element applies a traction force to the locking mechanism, especially to the locking element or the latching element, in order to manipulate the locking element or the latching element.

[0015] The particular advantage of this design is that the rotation of the shaft occurring when the backrest is adjusted is considered for the automatic manipulation of the locking mechanism and thus the folding of the headrest can be realized. The manipulation of the locking mechanism is thus forcibly coupled with the backrest adjustment in a simple manner.

[0016] In order to generate the rotary motion of the driving element, the previously described and connected with the shaft spindle is preferably provided, and the driving element has the spindle nut mentioned earlier, which is displaced translationally in the longitudinal direction when the shaft rotates. In addition, the driving element is also forcibly guided by the sliding groove type guide for generating the rotary motion of the driving element. The particular advantage achieved by the sliding groove type guide is that the rotary motion and the required adjustment stroke are controlled purposefully. Therefore, by the sliding groove type guide or the sliding groove type control, the manipulation of the locking mechanism is realized at the defined swing position of the backrest with respect to the seating part. The locking mechanism is manipulated especially when the swing motion of the backrest from the normal position towards the folding position starts.

[0017] In a preferred design, the two aforementioned aspects are combined. Thus, this special design of the driver, which implements both translational and rotational movements via the rotational movement of the shaft, allows two different functions to be coordinated and implemented via a common mechanism: actuating the limit switch on the one hand and actuating (unlocking) the locking mechanism of the headrest on the other. This results in a compact design with few components, which overall results in a cost-effective solution.

[0018] The control element preferably has a rope, a wire or a plastic rope as the element of the rope form and is also preferably embodied as a Bowden traction member. In particular, the control element is configured to transmit traction and pressure to the locking mechanism.

[0019] In a preferred embodiment, the slotted guide is generally designed such that the driver can be actuated in different rotational directions during its translational movement in the longitudinal direction, i.e., in only one direction. This allows for targeted control along and against defined rotational directions about the pivot axis. This enables controlled rotational movement of the operating element for actuating the limit switch in the first aspect of the invention and for generating controlled and defined adjustment paths in different directions in the second aspect of the invention. The slotted guide thus ensures that, when the backrest is pivoted in only one direction, the operating element and / or the control element itself executes different, and in particular opposite, movements. This ensures that, in the first aspect, the operating element can actuate only one limit switch, preferably configured as a button, in both end positions.

[0020] The slotted guide is particularly designed such that, during a translational movement in the longitudinal direction, i.e., in only one direction, starting from a first end position (normal position) of the backrest, the driver element rotates in a certain rotational direction in a starting region, and in the region of the second end position (folded position) of the backrest, the driver element rotates in the opposite direction of this rotational direction in the end region of the translational movement. The driver element typically moves in the longitudinal direction along the core axis from a first end position in the starting region to a second end position in the end region. The start and end of the translational movement are defined by the two end positions of the backrest, to which the two end positions of the driver element are associated.

[0021] In particular, in the starting range, a rotational movement in the rotational direction causes the limit switch, preferably designed as a button, to be actuated for the first time via the operating element. To actuate the limit switch, it is particularly provided that the operating element is rotated away from the limit switch, and thus the button. This means that the button moves from its previously pressed position to a de-energized, released position, in which the operating element is moved away. Conversely, in the ending range, the limit switch is actuated again by the operating element due to a reverse rotation. It is particularly provided that the button is pressed, i.e., the operating element rotates toward the button, generating a switching signal, which thus signals reaching the (second) end position. This switching signal is detected by a suitable electronic control unit and, in particular, causes the electric drive motor to stop.

[0022] In the reverse process, i.e. when the backrest is flipped upwards from the folded position into the upright position, the movement process of the driving member is reversed, that is, the driving member is shifted translationally against the longitudinal direction and rotated against the rotational direction, so that the driving member first rotates away from the limit switch in the end area and presses the limit switch in the starting area and thus generates a switching signal when the first final position is reached.

[0023] Next, the motion curves from the upright normal position to the folded position are described. The entire adjustment mechanism is configured so that in the reverse motion, that is, when tilting upward from the folded position toward the normal position, the motion curves are reversed and occur in an inverted order.

[0024] According to the second aspect of the invention, in the starting range, the control element is loaded and, in particular, tensioned by the rotational movement in the rotational direction, so that the control element executes a control stroke for actuating the locking mechanism. In the ending range, the control element is relieved again by the reverse rotational movement, i.e., the control element is, in particular, relaxed again.

[0025] In a preferred refinement, in the case of translational adjustment, an intermediate region is provided after the starting region, the intermediate region being constructed between the starting region and the end region. The limit switch is not actuated in this intermediate region. Therefore, the guideway-like guide is designed to maintain the functional state of the actuating element and / or the control element. The control element is preferably in a tensioned state in the intermediate region. For example, the intermediate region extends over at least 40%, and preferably at least 50%, of the entire translational adjustment travel of the driver along the core axis.

[0026] The length of the starting region in the longitudinal direction corresponds, for example, to at most 30% and in particular to at most 20% of the length of the entire translational adjustment stroke. The length of the ending region preferably also corresponds to at most 30% and in particular to at most 20% of the length of the entire translational adjustment stroke. The length of the ending region is preferably identical to the length of the starting region.

[0027] This measure ensures that, when the backrest begins to be adjusted out of its normal position, the limit switch, and in particular the control element, can be smoothly actuated to unlock the locking mechanism. The control or operating element is then held in a relatively neutral position over the intermediate region of the driver's translational adjustment travel and, therefore, over a sub-region of the backrest's adjustment movement, in which the state of the control or operating element is not changed, and in particular, no functions, such as actuation of the limit switch or control element, are triggered. In this intermediate region, the operating element remains spaced apart from the limit switch. With regard to the second aspect, the control element is held in a loaded position, i.e., a tensioned position, in the intermediate region.

[0028] In a preferred embodiment, the slotted guide has sections with different inclinations relative to the shaft axis, so that the driver (depending on its translational positioning along the spindle) has different rotational speeds and / or different rotational directions. This measure thus allows the movement profile of the actuating and / or control element to be adjusted in a targeted and desired manner.

[0029] The driver expediently comprises a sleeve-shaped part with an internal thread for forming the spindle nut, wherein one or more or preferably all of the following elements are also formed on the circumference of the sleeve-shaped part:

[0030] Therefore, a holder, in particular a terminal holder, is preferably provided for the end piece, in particular for a terminal of the control element.

[0031] Alternatively or additionally, the actuating element can be elongated in the longitudinal direction and preferably designed as a rib oriented in the longitudinal direction. The length of the actuating element in the longitudinal direction corresponds in particular to at least the translational adjustment travel of the driver between its two end positions. This reliably ensures that the actuating element actuates a (single) limit switch in both end positions due to a rotational movement in or against the direction of rotation.

[0032] As an alternative to an operating element extending over such a length, it can also be assembled from two sub-parts spaced apart from one another in the longitudinal direction, which are positioned such that in their respective end positions they are located at the longitudinal position of the limit switch.

[0033] Furthermore, a guide element, in particular designed as a guide pin, is arranged on the sleeve-shaped portion, which guide element projects in the radial direction and engages in a form-fitting manner in the sliding guide.

[0034] The driver is preferably designed as a one-piece, integral component and is made of plastic, for example. The component is produced, for example, as a cast part, an injection-molded part or by a 3D printing method.

[0035] In a preferred embodiment, a carrier member is provided, which is particularly firmly connected to the backrest and has a sliding guide and a bearing for the spindle. The carrier member is particularly a component of a complete assembly that can be fastened to the seat, particularly the backrest.

[0036] The support component preferably has at least one, preferably several, and in particular all of the following elements: at least one and preferably several fastening elements for fastening the support component to the seat, in particular to the backrest. For this purpose, a latching element or a plug element is particularly provided. Alternatively or additionally, a screw fastening element may be provided, for example.

[0037] A guide for the control element is formed on the support component, in particular. The guide is in particular a channel, which is open to one side, for example, and into which the control element, in particular the Bowden traction element, can be inserted.

[0038] Preferably, the carrier component also has a holder for the electronics assembly, wherein the electronics assembly in turn includes a limit switch. Thus, the positioning of the limit switch at the carrier component is defined and thus also related to the spindle and thus to the driver.

[0039] The supporting component is preferably a one-piece, integral component, in particular made of plastic. The supporting component is produced, for example, as a cast part, an injection-molded part or by a 3D printing method.

[0040] According to the present invention, this object is also achieved by an assembly for such a device. The assembly comprises the aforementioned support member, a mandrel, and a driver. A sliding guide is integrated into the support member. Furthermore, the mandrel is rotatably supported on a bearing, such as a plain bearing. The mandrel is typically preferably hollow and configured for insertion of a shaft and for rotationally fixed connection thereto. The rotationally fixed connection is, for example, achieved by a frictional engagement between the shaft and mandrel. Preferably, a positive-locking connection is achieved between the shaft and mandrel.

[0041] Furthermore, a guide element for engaging in a sliding guide and finally a holder for an actuating element of the limit switch and / or for an end piece of the control element are arranged on the driver.

[0042] The assembly kit forms a preassembled structural unit which only needs to be fastened to the seat and in particular to the backrest. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The following is a more detailed description of an embodiment of the present invention with the aid of the accompanying drawings. In the partially simplified diagram:

[0044] Figure 1 The seat is shown in perspective with the backrest in an upright, normal position and in phantom with the backrest in a folded position;

[0045] Figure 2 shows a perspective view of an assembled assembly with a load-bearing member, a mandrel, and further elements;

[0046] Figures 4A-4C The assembly is shown in different positions during operation, namely when the driver is in the starting area, the middle area and the end area;

[0047] Figure 3 An exploded view showing the various elements of the assembly;

[0048] Figure 5 A view showing the assembled components;

[0049] Figure 6A Shown along Figure 5 A cross-sectional view of the cutting line EE in FIG;

[0050] Figure 6B Shown along Figure 5 A sectional view of the section line BB in FIG; and

[0051] Figure 6C Shown along Figure 5 A cross-sectional view of the cutting line CC in FIG; DETAILED DESCRIPTION

[0052] exist Figure 1The seat 2 shown in FIG. 2 is configured as a vehicle seat for installation in a vehicle. The seat has a seating portion 4 and a backrest 6 that can be pivoted relative to the seating portion 4 from an upright, normal position and a folded, tilted position. The seating portion 4 and the backrest 6 in the folded position are shown in dashed lines. To enable the pivotability of the backrest 6, two opposing rotating fittings 8 are provided. In the exemplary embodiment, the rotating fittings are fastened to two opposing fastening structures, to which the seating portion 4 is also fastened and, via the fastening structures, secure the seating portion to the vehicle floor. The two rotating fittings 8 are connected to each other via a shaft 10 that extends along a shaft axis 12 in a longitudinal direction L. The shaft 10 is designed as a drive shaft for adjusting the inclination of the backrest 6 and is driven by an electric drive motor (not shown in detail). The shaft 10 also serves to synchronize the movement of the two opposing rotating fittings 8.

[0053] A foldable headrest 14 is also provided on the backrest 6 and can be folded from a normal operating position into a folded position. In the normal operating position, the headrest 14 is oriented essentially in the direction of the backrest 6 ( Figure 1 The right half of the figure shows the backrest 6 in an upright normal position. In the folded position, it is oriented substantially transversely to the backrest 6 (the left half of the figure shows the backrest 6 and the headrest 14 in a folded position using dashed lines). The position of the headrest 14 can be locked in the operating position by means of a locking mechanism 16. To release the lock of the locking mechanism 6, a control element 18 is provided, which in the exemplary embodiment is designed as a Bowden traction element. The headrest 14 is typically preloaded by a spring mechanism so that when the lock is released, it automatically folds into the folded position due to the spring force.

[0054] The rotary fitting 8, the shaft 10, the locking mechanism 16, the control element 18 and the electric drive motor are part of an adjustment mechanism for the electromotor-controlled adjustment of the backrest 6. Figure 1 The positions shown in FIG, namely the upright normal position and the folded, folded position, constitute the final positions. The adjustment mechanism typically includes a device for detecting these two final positions. When reaching the final position, the device sends a signal to the motor control unit to stop the drive motor. In addition, during the folding of the backrest 6, the lock of the locking mechanism 16 is automatically released, allowing the headrest 14 to be folded into the folded position.

[0055] The detection of the final position and the simultaneous unlocking of the locking mechanism 16 are accomplished by means of a special mechanism as will be explained in more detail below. For this purpose, a preassembled assembly component 20 is provided, which is Figure 1 The assembly is preferably arranged directly adjacent to one of the rotary fittings 8 , in the embodiment directly adjacent to the rotary fitting 8 in the left half of the figure.

[0056] The structure and function of the assembly group 20 will become apparent in particular from the following figures. Figure 2 Here, the assembled assembly 20 is shown and the Figure 3 The exploded view of FIG. 2 clearly shows the various components of the assembly 20 .

[0057] As an alternative to a preassembled assembly, the individual elements are, for example, individually arranged on the backrest structure. The following description of the interaction of the individual elements also applies to this fastening method and is independent of the design of the preassembled assembly.

[0058] If with the help of Figure 2 as well as Figure 3 As can be seen, the assembly 20 has a support member 22, which is particularly designed as a monolithic component, for example, as an injection-molded part. Furthermore, the assembly 20 has a mandrel 24, which is designed as a hollow cylindrical element. The shaft 10 is inserted through the mandrel 24 and is connected to it in a rotationally fixed manner. To this end, in the exemplary embodiment, the shaft 10 has a non-circular cross-sectional geometry and, for example, is designed as a polygon at least in the region of the mandrel 24. Furthermore, a driver 26 is attached to the mandrel 24, which is preferably also designed as a monolithic, one-piece component, for example, as an injection-molded part.

[0059] The driver 26 has a sleeve-shaped part 28, which carries an internal thread, not shown in detail here, which engages with the external thread of the core shaft 24, so that when the shaft 10 rotates and the core shaft 24 rotates, the driver 26 is displaced translationally along or against the longitudinal direction L. The sleeve-shaped part 28 constitutes a core shaft nut in this regard. An operating element 30 for operating the limit switch 32 and a holder 34 for fastening the end block of the control element 18 are constructed on the peripheral side of the sleeve-shaped part 28. The operating element 30 usually extends in the longitudinal direction L and is constructed in particular in the style of radially protruding strips or ribs. In the embodiment, the holder 34 has a slotted hollow channel, which is constructed in particular as a so-called joint holder chamber. The joint is embedded in this joint holder chamber in a form-fitting manner, and the joint is placed on the end side of the rope of the control element 18 constructed as a Bowden traction member (see also ). Figure 3 ).

[0060] On the sleeve-shaped part 28, a guide element designed as a guide pin 38 is also arranged on the circumference, which guide element protrudes in the radial direction. A cap 40 is placed on this guide element, which is designed in the manner of a so-called rolling cap in order to ensure the lowest possible friction during operation ( Figure 3 ).

[0061] The bearing member 22 further has a retaining portion 42 ( Figure 3), the holder accommodates an electronics assembly 44, which includes the previously mentioned limit switch 32. In this case, the electronics assembly 44 essentially consists of the limit switch 32 and a plug connected to the limit switch. The limit switch 32 is connected to the control unit via an electrical plug connection. The limit switch 32 is designed as a pushbutton.

[0062] Furthermore, the support member 22 has a guide 46 designed in the manner of a guide channel, particularly in the upper end region in which the control element 18 is received and held, particularly in a form-fitting manner. As already mentioned above, the control element 18 is designed in particular as a Bowden traction element, which generally has a cable or wire that is guided in a hose-like sheath. A connector is typically provided at the end of the cable (see in particular the Figure 3 The end piece of the encapsulation is now preferably held in the guide 26 in a form-fitting manner.

[0063] Furthermore, within the support component 22, the slotted guide 48 as an important element is preferably configured as a channel-shaped recess within the support component, which has a defined two-dimensional variation curve ( Figure 3 ).

[0064] Furthermore, the support component 22 has a bearing 50 which is designed in particular in the manner of a sliding bearing and in which the end piece of the sleeve-shaped mandrel 24 is rotatably supported ( Figure 3 The bearing 50 and the end piece of the mandrel 24 are generally preferably used to secure the mandrel 24 both radially and axially on the support component 22. To this end, the end piece first has a sleeve-shaped tab that engages in the bearing 20 for radial support. In addition, a rib-shaped, circumferential, radially protruding tab is formed, which is provided for axial securing and rests against a corresponding annular wall of the support component 22.

[0065] Furthermore, fastening elements 52 , which are preferably designed as latching elements, are formed on the support component 22 , by means of which the support component 22 and thus the entire assembly 20 are fastened to the backrest 6 .

[0066] The guide pin 38 engages in the sliding guide 48. When the mandrel 22 and thus the shaft 10 rotate, this results in a translational adjustment of the driver 26 along or against the longitudinal direction L. Due to the engagement of the guide pin 38, the guide pin and thus the driver 26 are forced to undergo a rotational movement about the shaft axis 12 due to the sliding guide 48. Thus, a rotational movement is superimposed on the translational movement of the driver 26, which is limited and controlled by the sliding guide 48.

[0067] Especially with the help of Figures 4A to 4CThe diagram in Fig. 3 shows the movement profile:

[0068] In Figure 4A , the carrier element 26 is in a first end position, which corresponds to a first final positioning of the backrest 6 and thus to an upright normal positioning.

[0069] In the adjustment of the backrest 6 towards the seating portion 6, the spindle 24 is rotated and causes a translatory movement of the carrier element 26 in the longitudinal direction L. The carrier element 26 passes from a starting region Figure 4A , through an intermediate region Figure 4B and finally reaches an end region and a second end position Figure 4C . This second end position corresponds to a second final positioning of the backrest 6 when the backrest is in the folded positioning.

[0070] As is particularly clearly seen, inter alia, with the aid of Figure 3 , the slide-like guide 48 is formed in the starting region with a relatively steep rising profile about the axis of the shaft 12, so that in the starting region the carrier element 26 has a high rotational speed and is twisted over a large angular range in the rotational direction D. The end of the starting region is defined by the maximum rotational deflection in the rotational direction D.

[0071] By this rotational movement the operating element 30 is lifted from the limit switch 32 on the one hand, whereby the limit switch is released to some extent, as is clearly seen with the aid of Fig. 4, which shows the end of the starting region and the beginning of the intermediate region.

[0072] At the same time, by this movement the control element 18 is tensioned and pulled through a defined adjustment path, which leads to the unlocking of the locking mechanism 16.

[0073] In the subsequent intermediate region the functional positions of the operating element 30 and of the control element 18 are at least substantially maintained. This means that the operating element 30 remains in its lifted position from the limit switch 32 and the control element 18 is in its tensioned position.

[0074] In the embodiment, in the intermediate region a counter-rotational movement against the rotational direction has been achieved, but at a lower rotational speed (with constant rotational speed of the shaft 10), so that the carrier element 26 is gradually guided back again from its maximum twist in the rotational direction D as it is shown in Figure 4B . The lower rotational speed (compared to the process in the starting region) is achieved by a flat and less steep and counter-directed profile curve of the slide-like guide 48 about the axis of the shaft 12.

[0075] This is particularly evident in the slotted guide 48 in that, viewed in the longitudinal direction L, the slotted guide initially rises steeply transversely to the longitudinal direction L to a maximum lateral deflection, and then subsequently descends again with a lower slope.

[0076] In the end region, the last driver 26 is pivoted and essentially returns to the rotational position it occupied at the beginning (i.e., in the first end position). As a result, the operating element 30 is rotated again to the limit switch 32 and actuates it, which is evaluated by the control unit as a switching signal for reaching the second end position.

[0077] In the second end position, the control unit 18 is still relieved of stress, ie no tensile stress is present any more.

[0078] When the backrest 6 is adjusted from the folded position to the upright normal position, the movement curve is reversed, that is to say, the driver 26 is moved from its original position to the upright normal position. Figure 4C Starting from the second end position in Figure 4A During this movement, the actuating element 30 is initially lifted from the limit switch 32, then passes through an intermediate region in this lifted, rotated position, and then rotates in the starting region again in the direction of the limit switch 32 and actuates it. Thus, upon reaching the first end position, and thus the first end position (upright, normal position), a switching signal for stopping the electric motor is generated.

[0079] In particular, based on Figures 6A to 6C The cross-sectional view shows how the different components interact during the adjustment movement. Figure 6B The section is shown in the first end position, ie at the beginning of the adjustment movement and the beginning of the rotational movement out of the first end position. Figure 6C The cross section is shown at the maximum rotational deflection of the driver 26 and according to Figure 6C This cross-section of thus defines the end of the starting area. Figure 6C It can be clearly seen how the limit switch 32 (button) is released by the actuating element 30 and the control element 18 is also tensioned by the adjustment travel.

[0080] Reference Signs List

[0081] 2 seats

[0082] 4. Ride

[0083] 6 Backrest

[0084] 8 Rotating accessories

[0085] 10-axis

[0086] 12 axis of the shaft

[0087] 14 headrest

[0088] 16 latching mechanism

[0089] 18 control element

[0090] 20 assembly

[0091] 22 carrier member

[0092] 24 spindle

[0093] 26 carrier

[0094] 28 sleeve-like portion

[0095] 30 actuating element

[0096] 32 limit switch

[0097] 34 holder for the control element

[0098] 38 guide tenon

[0099] 40 cover

[0100] 42 holder for the electronics assembly

[0101] 44 electronics assembly

[0102] 46 guide

[0103] 48 slide-type guide

[0104] 50 bearing

[0105] 52 fastening element

[0106] L longitudinal direction

[0107] D direction of rotation

Claims

1. A device for seat adjustment of a seat (2), said seat comprising a seating part (4) and a backrest (6), said backrest being adjustable between two end positions, namely an upright normal position and a folded folded position, by means of an adjustment mechanism, wherein: The adjusting mechanism comprises opposed rotating fittings (8) which are connected to each other via a shaft (10), the shaft being rotatable about a shaft axis (12) and extending in a longitudinal direction (L) along the shaft axis (12), and wherein a device for detecting two final positions is also provided, the device comprising a spindle (24) connected to the shaft (10) and a spindle nut, the spindle nut being displaced translationally in the longitudinal direction (L) when the shaft (10) is rotated, wherein the spindle nut is part of a driver (26) which has an operating element (30) for a limit switch (32), It is characterized in that The driver (26) is positively guided by means of a mechanical sliding guide (48), so that a rotational movement of the driver (26) is superimposed on the translational movement, and the sliding guide (48) is designed such that the actuating element (30) actuates the limit switch (32) in both end positions.

2. The device according to claim 1, characterized in that A headrest (14) is fixed to the backrest (6), the headrest being capable of being folded from an operating position into a folded position and being lockable in the operating position by means of a releasable locking mechanism (16), wherein the driver (26) performs a rotational movement about the axis (12) of the shaft when the shaft (10) is rotated, and a control element (18) is fastened to the driver, the control element being connected to the locking mechanism (16) for actuating the locking mechanism, so that the locking mechanism (16) is automatically actuated by the control element (18) when the backrest (6) is adjusted.

3. The device according to claim 2, characterized in that The control element (18) has a rope or a wire.

4. The device according to claim 3, characterized in that The control element (18) is designed as a Bowden traction element.

5. The device according to claim 1, characterized in that The slotted guide (48) is designed such that the driver (26) is actuated in different rotational directions (D) during a translational movement of the driver (26) in the longitudinal direction (L).

6. The device according to claim 1, characterized in that The sliding guide (48) is designed such that during the translational movement in the longitudinal direction (L), the driver (26) is rotated in a certain rotational direction (D) in a starting area and in an end area the driver (26) is rotated counter to the rotational direction (D).

7. The device according to claim 6, characterized in that The sliding groove guide (48) is configured such that: - in a starting range, due to a rotation in the rotational direction (D), the operating element (30) operates the limit switch (32), and in an ending range, due to a rotational movement opposite to the rotational direction (D), the operating element (30) again operates the limit switch (32), and / or - In a starting range, due to the rotation in the rotational direction (D), the control element (18) is loaded and a control stroke is performed for actuating the locking mechanism (16), while in an ending range, due to the rotational movement counter to the rotational direction (D), the control element (18) is unloaded.

8. The device according to claim 6, characterized in that The sliding groove guide (48) is configured such that: - in a starting region, due to a rotation in the rotational direction (D), the operating element (30) actuates the limit switch (32) configured as a push button and is lifted from the limit switch (32), and in an ending region, due to a rotational movement opposite to the rotational direction (D), the operating element (30) again actuates the limit switch (32) by pressing the limit switch (32), and / or - In the starting range, due to the rotation in the rotational direction (D), the control element (18) is loaded and tensioned and a control lift is performed for actuating the locking mechanism (16), while in the ending range, due to the rotational movement opposite to the rotational direction (D), the control element (18) is relieved of the load.

9. The device according to claim 7, characterized in that An intermediate region is formed between the start region and the end region, wherein the limit switch (32) is not actuated in the intermediate region.

10. The device according to claim 1, characterized in that The slotted guide (48) has sections of different inclinations, so that, depending on the translational positioning of the driver (26) along the spindle (24), the driver (26) has different rotational speeds and / or different rotational directions (D).

11. The device according to claim 1, characterized in that The driver (26) has a sleeve-shaped portion (28) having an internal thread for forming the spindle nut, and at least one of the following elements is formed on the circumference of the sleeve-shaped portion (28): - a holder (34) for the end piece of the control element (18), - the actuating element (30) is designed as a rib oriented in the longitudinal direction (L) or has two sub-elements spaced apart from one another in the longitudinal direction (L), - A guide element which engages in the sliding guide (48).

12. The device according to claim 11, characterized in that The guide element is designed as a guide pin (38).

13. The device according to claim 1, characterized in that Several or all of the following elements are formed on the circumference of the sleeve-shaped portion (28): - a holder (34) for the end piece of the control element (18), - the actuating element (30) is designed as a rib oriented in the longitudinal direction (L) or has two sub-elements spaced apart from one another in the longitudinal direction (L), - A guide element which engages in the sliding guide (48).

14. The device according to claim 1, characterized in that The driver (26) is designed as an integral, one-piece component.

15. The device according to claim 14, characterized in that The driving member (26) is made of plastic.

16. The device according to claim 1, characterized in that A carrier member (22) is provided, which has the sliding guide (48) and a bearing (50) for the spindle (24).

17. The device according to claim 16, characterized in that The load-bearing member (22) further comprises at least one of the following elements: - at least one fastening element (52) for fastening the carrier member (22) to the backrest (6), - a guide (46) for the control element (18), - A holder (42) for an electronics assembly (44) comprising the limit switch (32).

18. The device according to claim 16, characterized in that The load-bearing member (22) further comprises several or all of the following elements: - at least one fastening element (52) for fastening the carrier member (22) to the backrest (6), - a guide (46) for the control element (18), - A holder (42) for an electronics assembly (44) comprising the limit switch (32).

19. The device according to claim 16, characterized in that The load-bearing component (22) is an integral, one-piece component.

20. The device according to claim 19, characterized in that The bearing member (22) is made of plastic.

21. A device for seat adjustment of a seat (2), wherein: The seat (2) comprises a seating part (4) and a backrest (6), which can be adjusted between two final positions, namely between an upright normal position and a folded folded position, by means of an adjustment mechanism, wherein the adjustment mechanism comprises opposing rotating fittings (8) which are connected to each other via a shaft (10), which can be rotated about a shaft axis (12) and extends in a longitudinal direction (L) along the shaft axis (12), wherein a headrest (14) is fixed to the backrest (6), which can be folded from an operating position into a folded position and can be locked in the operating position by means of a releasable locking mechanism (16), It is characterized by: A driver (26) connected to the shaft (10) is provided, the driver performs a rotational movement about the axis (12) of the shaft when the shaft (10) rotates, and a control element (18) is fastened to the driver, the control element is connected to the locking mechanism (16) for operating the locking mechanism, so that the locking mechanism (16) is automatically operated by the control element (18) when the backrest (6) is adjusted.

22. The device according to claim 21, characterized in that A spindle (24) connected to the shaft (10) is provided, and the driver (26) has a spindle nut, which is displaced translationally in the longitudinal direction (L) when the shaft (10) is rotated, and the driver (26) is also forcibly guided by means of a sliding groove guide (48) to generate the rotational movement of the driver.

23. The device according to claim 21, characterized in that The control element (18) has a rope or a wire.

24. The device according to claim 23, characterized in that The control element (18) is designed as a Bowden traction element.

25. The apparatus according to claim 22, wherein The slotted guide (48) is designed such that the driver (26) is actuated in different rotational directions (D) during a translational movement of the driver (26) in the longitudinal direction (L).

26. The apparatus according to claim 22, wherein The sliding guide (48) is designed such that during the translational movement in the longitudinal direction (L), the driver (26) is rotated in a certain rotational direction (D) in a starting area and in an end area the driver (26) is rotated counter to the rotational direction (D).

27. The device according to claim 26, characterized in that The sliding groove guide (48) is configured such that: - in a starting range, due to a rotation in the rotational direction (D), the operating element (30) operates the limit switch (32), and in an ending range, due to a rotational movement opposite to the rotational direction (D), the operating element (30) again operates the limit switch (32), and / or - In a starting range, due to the rotation in the rotational direction (D), the control element (18) is loaded and a control stroke is performed for actuating the locking mechanism (16), while in an ending range, due to the rotational movement counter to the rotational direction (D), the control element (18) is unloaded.

28. The apparatus according to claim 26, wherein The sliding groove guide (48) is configured such that: - in a starting region, due to a rotation in the rotational direction (D), the operating element (30) actuates the limit switch (32) configured as a push button and is lifted from the limit switch (32), and in an ending region, due to a rotational movement opposite to the rotational direction (D), the operating element (30) again actuates the limit switch (32) by pressing the limit switch (32), and / or - In the starting range, due to the rotation in the rotational direction (D), the control element (18) is loaded and tensioned and a control lift is performed for actuating the locking mechanism (16), while in the ending range, due to the rotational movement opposite to the rotational direction (D), the control element (18) is relieved of the load.

29. The apparatus according to claim 27, wherein An intermediate region is formed between the start region and the end region, wherein the limit switch (32) is not actuated in the intermediate region.

30. The apparatus according to claim 22, wherein The slotted guide (48) has sections of different inclinations, so that, depending on the translational positioning of the driver (26) along the spindle (24), the driver (26) has different rotational speeds and / or different rotational directions (D).

31. The apparatus according to claim 22, wherein The driver (26) has a sleeve-shaped portion (28) having an internal thread for forming the spindle nut, and at least one of the following elements is formed on the circumference of the sleeve-shaped portion (28): - a holder (34) for the end piece of the control element (18), - the actuating element (30) is designed as a rib oriented in the longitudinal direction (L) or has two sub-elements spaced apart from one another in the longitudinal direction (L), - A guide element which engages in the sliding guide (48).

32. The device according to claim 31, characterized in that The guide element is designed as a guide pin (38).

33. The apparatus according to claim 22, wherein Several or all of the following elements are formed on the circumference of the sleeve-shaped portion (28): - a holder (34) for the end piece of the control element (18), - the actuating element (30) is designed as a rib oriented in the longitudinal direction (L) or has two sub-elements spaced apart from one another in the longitudinal direction (L), - A guide element which engages in the sliding guide (48).

34. The apparatus according to claim 21, wherein The driver (26) is designed as an integral, one-piece component.

35. The device according to claim 34, characterized in that The driving member (26) is made of plastic.

36. The apparatus according to claim 22, wherein A carrier member (22) is provided, which has the sliding guide (48) and a bearing (50) for the spindle (24).

37. The device according to claim 36, characterized in that The load-bearing member (22) further comprises at least one of the following elements: - at least one fastening element (52) for fastening the carrier member (22) to the backrest (6), - a guide (46) for the control element (18), - A holder (42) for an electronics assembly (44) comprising the limit switch (32).

38. The apparatus according to claim 36, wherein The load-bearing member (22) further comprises several or all of the following elements: - at least one fastening element (52) for fastening the carrier member (22) to the backrest (6), - a guide (46) for the control element (18), - A holder (42) for an electronics assembly (44) comprising the limit switch (32).

39. The apparatus according to claim 36, wherein The load-bearing component (22) is an integral, one-piece component.

40. The apparatus according to claim 39, wherein The bearing member (22) is made of plastic.

41. An assembly component (20) for a device according to any one of claims 1 to 40, comprising a carrier component (22), a spindle (24) and a driver (26) forming a spindle nut, wherein: - the carrier member (22) has a sliding groove guide (48), The spindle (24) is rotatably supported on a bearing (50) of the support component (22) and is designed for insertion of the shaft (10) and for rotationally fixed connection to the shaft (10). A guide element for engaging in the sliding guide (48) and a holder (34) for an actuating element (30) of a limit switch (32) and / or an end piece of a control element (18) are arranged on the driver (26).

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