WO2019048399A1

WO2019048399A1 - Vehicle seat which can be pivoted forwards

Info

Publication number: WO2019048399A1
Application number: PCT/EP2018/073671
Authority: WO
Inventors: Pankaja PATIL; Chetansingh Rajput; Marcel Amstein; Jürgen SCHUKALSKI; Jochen Hofmann; Jörg Gropp; Nadja KOLB
Original assignee: Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Coburg
Priority date: 2017-09-08
Filing date: 2018-09-04
Publication date: 2019-03-14
Also published as: CN111051125A; DE102017215929A1; CN111051125B

Abstract

The invention relates to a vehicle seat (1, 1') comprising a seat part (10), a backrest part (11) which is arranged on the seat part (10) in an adjustable manner, and a coupling mechanism (14, 14'), by means of which the vehicle seat (1, 1') can be converted from a use position into a pivoted position and which comprises the following: a frame (140) which supports the seat part (10) and via which the seat part (10) is to be connected to a vehicle floor (B), a front rocker (141) which is hinged to the frame (140) by means of a joint (G1) and is coupled to the seat part (10) via at least one other joint (G2, G8, G9), and a rear rocker (142) which is coupled to the seat part (10) via at least one joint (G3) and via which the seat part (10) is coupled to the frame (140) via at least one other joint (G4, G5). One of the joints (G4; G5), via which the rockers (141, 142) are coupled to the frame (140), is designed as a turning-sliding joint. The coupling mechanism (14, 14') comprises an additional connection arm (143; 144) via which the front rocker (141) is coupled to the rear rocker (142). In this manner, a vehicle seat is provided which can be converted from the use position to a non-use position in a particularly space-same manner.

Description

Pre-swivel vehicle seat

description

The invention relates to a vehicle seat according to the preamble of claim 1. Such a vehicle seat comprises a seat part, an adjustable arranged on the seat part backrest part and a coupling mechanism. The coupling mechanism is adapted to transfer the vehicle seat from a use position to a forward position and vice versa, and includes a frame, a front rocker and a rear rocker. The frame is arranged to support the seat portion and to connect the seat portion to a vehicle floor. The front rocker is articulated via a joint on the frame and coupled via exactly one or at least one other joint with the seat part. The rear rocker is arranged closer to the backrest than the front rocker and coupled via at least one joint with the seat part. By the rear rocker the seat part is coupled via another joint or more joints with the frame. In this case, one of the joints, via which the rockers are coupled to the frame, designed as a rotary push joint.

Such a vehicle seat may in particular be designed as a driver or passenger seat in a first row of seats of a vehicle. In the use position, a seat occupant can sit on the vehicle seat. The vorwenkte position as a non-use position facilitates entry or exit of a passenger in a seated behind the vehicle seat. The vorwenkte position is often referred to as "easy-entry position".

Such a vehicle seat with a use position and an easy-entry position is known for example from DE 10 2015 222 133 A1.

For a comfortable as possible entry into the rear row of seats, it is desirable that the vehicle seat can pivot as far forward. In this case, there is the difficulty of creating an adjustment kinematics in which the vehicle seat is not raised too much, since it can otherwise hit against other parts of the vehicle.

Object of the present invention is to provide a vehicle seat available that can be converted from the use position out particularly space-saving in a non-use position.

This object is achieved by an article having the features of claim 1. Thereafter, it is provided that the coupling mechanism comprises a (rigid) additional connecting arm, via which the front rocker is coupled to the rear rocker.

A movement of one of the two wings is transmitted via the additional connecting arm to the other of the two wings. In other words, the front rocker is positively coupled to the rear rocker via the additional link arm. The coupling mechanism is a coupling gear, wherein the additional link reduces the number of degrees of freedom of the linkage by one or at least one.

Such a designed coupling mechanism allows to provide a comparatively short rear rocker. In particular, the rear rocker may be shorter than the front rocker. This allows an adjustment kinematics, in which the vehicle seat has a particularly large stroke along the X-axis of the vehicle when transferred to the forward position with only a small stroke along the Z-axis of the vehicle, because the rear part of the vehicle seat on which the Backrest part is hinged, only slightly raised. This makes it possible to remove the vehicle seat from the To transfer position of use out particularly space-saving in a non-use position, especially in the vorwenkte position. This allows a particularly comfortable entry into a row of seats located behind the vehicle seat, even if the vehicle has, for example, a low profile of the vehicle headliner.

The rotary push joint preferably allows a linear movement along an adjustment path and a rotational movement about a pivot axis perpendicular to the adjustment path. The pivot axis can cut the adjustment path. The joint, which is designed as a rotary push-type joint, can comprise a slide or slide guide, e.g. in the form of a long hole. For example, a bolt is guided in the backdrop. This is a particularly robust and simple type of rotary joint.

The backdrop is formed for example on one of the wings, on the seat frame or on the frame. As a result, particularly space-saving adjustment kinematics are possible.

The scenery (more precisely, the adjustment of the scenery) can be straight, in particular parallel to the adjustment of an optional longitudinal adjustment of the vehicle seat. Alternatively, the backdrop runs along a circular arc or along a curve. As a result, the movement path of the vehicle seat can be adapted to predetermined space conditions. For example, obstacles can be avoided in this way.

The additional connecting arm is articulated in one embodiment by a hinge on the front rocker. This joint may be spaced from the remaining hinges of the front wing.

Optionally, the additional connecting arm is articulated by means of a joint on the rear rocker, which may be spaced in particular from the other joints of the rear rocker.

Alternatively, the additional connecting arm is articulated to the same hinge of the rear rocker, via which the rear rocker is coupled to the frame. The additional connecting arm and the rear rocker are then both pivotable about the same pivot axis. The coupling mechanism may consist of a 7-joint kinematics or comprise a 7-joint kinematics. It can be provided in particular that during the transfer of the vehicle seat in the vorwenkte position to all of the seven joints of the 7-joint kinematics pivotal movement takes place.

The vehicle seat may have a fitting for pivoting the backrest part relative to the seat part. By means of the fitting several different angles of inclination of the backrest part can be adjusted to adapt the vehicle seat to a seat occupant. The fitting is e.g. around a turn or catch fitting. In one embodiment, the fitting in the position of use and / or in the pre-pivoted position of the vehicle seat (with proper arrangement of the vehicle seat in a vehicle) is always located above the coupling mechanism. In other words, all members and joints of the coupling mechanism are arranged below the fitting.

According to a further development, the coupling mechanism is additionally also designed to transfer the vehicle seat into a further non-use position, namely into a loading position, often also referred to as a "fold-flat position." For this purpose, the coupling mechanism can comprise a plurality of transmission elements which provide a coupling between the backrest part and The seat frame supports a seat cushion.

According to one embodiment, a control rocker on the frame or a frame-fixed seat structure and the seat frame (in particular in the region of the rear end) is articulated. The control rocker comprises a first and a second swing arm, between which the control rocker is articulated to a frame-fixed (or seat structure-fixed) articulation point. The first swing arm connects the seat frame (in particular the rear end of the seat frame) pivotally connected to the frame-fixed point of articulation. Further, a coupling lever is provided, which is connected via a joint (control joint) with the backrest part and a further joint (coupling joint) with the second swing arm of the control rocker. The coupling mechanism is designed so that the distance of the seat frame is adjusted by the frame during forward or backward folding of the backrest part. In this way, the seat frame can be lowered when folding the backrest part, while the backrest part is placed on the seat part. This allows the vehicle seat to occupy a particularly flat and thus space-saving loading position. The coupling lever is connected via its backrest side joint eg with a control lever of the backrest part. The control lever is arranged in an embodiment eccentric to the axis of rotation of the fitting of the vehicle seat and in particular rigidly connected to a backrest frame of the backrest part or constitutes a part of the backrest frame.

The coupling mechanism locks the seat frame in the use position in a stable position. When folding the backrest portion from the use position to the loading position of the coupling mechanism passes over a dead center, from which the seat frame is lowered to the frame. As a result, with simple means increased security in the position of use of the vehicle seat against unwanted lowering of the seat frame when exposed to crash forces on the vehicle seat guaranteed. In the dead center position of the coupling lever of the coupling mechanism is aligned in a straight line extension to the control lever of the backrest part.

In one embodiment, the coupling mechanism is structured and dimensioned such that the control rocker when passing through the dead center during the forward folding of the backrest portion first in one direction (eg clockwise) and further forward folding of the backrest portion in an opposite direction (eg counterclockwise) to the Gestellanlenkung is pivoted. In this way it can be ensured that the coupling mechanism when folding the backrest part and driving through the dead center does not immediately go into a position in which the lowering of the seat frame begins, but first passes over an area in which there is no lowering of the seat frame. This results in a sufficient tolerance range around the dead center of the coupling mechanism and thus increased security against unwanted lowering of the seat frame during the action of crash forces on the vehicle seat.

In principle, a drive of the movement of the vehicle seat from the use position to the vorwenkte position and vice versa can be done manually. In one embodiment, however, a drive, for example, with an electric motor, be provided for the power-operated adjustment of the vehicle seat from the use position in the vorwenkte position. Here, a torque generated by the drive for adjustment in the vorwenkte position (or for adjustment back into the use position), for example, at a joint of the coupling mechanism initiated. In one embodiment variant may alternatively or additionally be provided that a drive device of the drive via a toothing drives a rotation of a cross member which is rotatably connected to the front rocker. In particular, in order to make an adjustment of the vehicle seat independently of a motor drive in a power failure and concomitant loss of on-board voltage in the vehicle, the drive can be provided with a decoupling mechanism. About such a decoupling mechanism, the coupling mechanism for pivoting the vehicle seat can be decoupled from the drive if necessary, to allow manual adjustment. Such a decoupling mechanism includes, for example, an overload clutch.

In particular, with regard to a possible manual adjustment of the vehicle seat in case of power failure or after an accident (in this context is usually also discussed by the so-called "Panikfai) may be provided in a variant that the drive is not self-locking executed. Alternatively or additionally, the drive may be operable with a further circuit, in particular a battery or a rechargeable battery, so that in the event of a possible failure of the on-board voltage of the vehicle, an externally power-operated adjustment by means of the drive remains possible. To reduce an applied manually or externally operated adjusting force for adjusting the vehicle seat in the advanced position, at least one spring element may be provided which biases the coupling mechanism in the direction of the pre-pivoted position. Such a spring element comprises, for example, a torsion bar spring, which acts on an element of the coupling mechanism, for example the front rocker arm. The spring element can in this case, for example, also act on the element of the coupling mechanism on which a torque generated by a drive motor of the drive also acts upon actuation of the drive. Such a spring element can thus on the one hand support the motor drive and on the other hand support a manual adjustment (in particular with decoupled drive and / or non-self-locking drive), in particular in the so-called panic case. In particular, with a view to a manual adjustment of the vehicle seat from the use positions in the vorwenkte position, especially for the so-called panic case, in a variant of the coupling mechanism is designed and designed so that the frame with the present above the frame respectively above the seat part of the seat frame seat components , For example, the backrest, no adjustment carried out beyond a dead center. This includes in particular that the backrest of the vehicle seat follows an adjustment in the vorwenkte position of a steadily forward-facing adjustment. The adjustment path for the backrest thus follows a single rectilinear or curved adjustment direction without discontinuities or direction changes over a dead center. An adjustment over a dead center across can lead to stiffness and thus complicate the adjustment of the vehicle seat for a user, which should be avoided especially in an adjustment in case of panic. In one embodiment, the vehicle seat is additionally provided with a locking device. The locking device of the vehicle seat locks the coupling mechanism on a base assembly of the seat. For example, the locking device comprises a lock, by means of which the coupling mechanism is locked immovable relative to a base assembly and thus, for example, rails for the seat-length adjustment. Such a lock may for example be provided in the rear region of the seat and secure the coupling mechanism between the rail and a substructure of the vehicle seat. Such is in the driving operation of a vehicle in which the vehicle seat is mounted, an unintentional adjustment blocked via the coupling mechanism.

A locking device of the vehicle seat can be triggered manually and / or power-operated for unlocking and / or locking. In a power-operated release, for example, this can be done electrically via an actuator of the locking device.

In the use position, the control rocker is preferably arranged below the backrest part and substantially along a longitudinal axis of the backrest part predetermined backrest longitudinal axis. In addition, it can be provided that the frame is connected via a longitudinal adjustment with the vehicle floor or connectable, so that the vehicle seat is longitudinally adjustable. A vehicle seat of the type described can realize a vehicle front seat in the first row in a vehicle. However, a kinematics of the type described here can also be used, for example, in a second or third row rear seat.

It is understood that the vehicle seat can have the described coupling mechanism in duplicate, wherein in each case a coupling mechanism is arranged on one of the two longitudinal sides of the vehicle seat.

The idea underlying the invention will be explained in more detail with reference to the embodiment shown in the figures. Show it:

1A is a view of an embodiment of a vehicle seat in a seated by a seat occupant position of use;

Fig. 1 B is a view of the vehicle seat of Figure 1A in a pre-pivoted position. Fig. 2 is a schematic representation of a coupling mechanism for

Transferring the vehicle seat according to Figures 1A and 1B from the position of use in the vorwenkte position and vice versa.

3A and 3B are views of an embodiment of a vehicle seat in a seated by a seat occupant position of use;

4A is a schematic representation of the vehicle seat of FIG. 3A and

3B in the position of use after release of a lock; 4B is a schematic representation of the vehicle seat of FIG. 3A and

3B in a pre-tilted position; a schematic representation of the vehicle seat of Figures 3A and 3B in the locked position of use. and

Fig. 5B is a schematic representation of the vehicle seat according to Fig. 3A and

3B in a loading position; 6 shows a detail of a further embodiment of a

Vehicle seat in the position of use; Fig. 7 coincides with the Fig. 1A matching the vehicle seat with

Illustrating an adjustment path for a backrest of the vehicle seat.

1A and 1B show a vehicle seat 1 for carrying a seat occupant in a use position (FIG. 1A) and a non-use position, namely a pre-pivoted easy-entry position (FIG. 1B).

The vehicle seat 1 comprises a seat part 10 and a backrest part 11. The backrest part 1 1 is pivotally articulated by one or more fittings 13 on the seat part 10, so that different angles between the backrest part 1 1 and the seat part 10 are adjustable in the position of use.

In the use position, a seat occupant can sit on the vehicle seat 1. The seat part 10 comprises a seat cushion 101 shown in FIG. 1A, which is supported on a seat frame 100. Likewise, the backrest part 1 1 comprises a backrest cushion (not shown), which is supported on a backrest frame 1 10.

In the use position, the seat part 10 is locked by means of a lock 16 on a frame of the vehicle seat 1, on a longitudinal adjustment device 15 of the vehicle seat 1 and / or with the vehicle floor B. The latch 16 is presently arranged at a rear end of the seat part 10, wherein the rear end of the seat part 10 is the one which is adjacent to the backrest part 1 1. The front end of the seat part 10 is the backrest part 1 1 facing away from the end. For transferring the vehicle seat 1 from the use position into the forwarded easy-entry position, the vehicle seat 1 comprises a coupling mechanism 14, which will be explained in more detail below in connection with FIG. 2. When Vorschwenken the vehicle seat 1 (shown in Fig. 1A by arrows), it may be advantageous if in particular a headrest 12 of the vehicle seat 1 is only slightly raised, for example, so as not to hit a headliner. Fig. 2 shows the coupling mechanism 14 of the vehicle seat 1 in the position of use. The vehicle seat 1 comprises two such coupling mechanisms 14, one at each of its longitudinal sides. The coupling mechanism 14 is designed in the form of a linkage and comprises a plurality of gear members which are pivotally arranged by means of a plurality of joints.

A frame 140 of the coupling mechanism 14 is connected to the longitudinal adjustment device 15, e.g. attached to an upper rail of the longitudinal adjustment device 15. The longitudinal adjustment device 15 is connected to the vehicle floor B or connectable. Alternatively, the frame 140 could also be connected to the vehicle floor B without a longitudinal adjustment device. In the present case, the coupling mechanism 14 is articulated at two locations on the (rigid) frame 140. The frame 140 supports the seat portion 10 and is adapted to support at least a portion of the weight of the seat portion 10.

At a first position of the frame 140, a (first) joint G1 is arranged, on which a front rocker 141 is pivotally hinged to the frame 140. The front rocker 141 is pivotally connected to the seat frame 100 via a (second) joint G2 at its end opposite the frame (140) of the first joint G1. The seat frame 100 is pivotally connected to a rear rocker 142 at a (third) joint G3 spaced from the (second) joint G2 to the front rocker G2. The rear rocker 142 is pivotally connected to a connecting arm 147 via a (fourth) joint G4 spaced from the (third) joint to the seat frame 100. The connecting arm 147 is connected at its opposite end via a (fifth) joint G5 with the frame 140, which is designed here as a rotary push joint, for example as a backdrop. The connecting arm 147 can thus be pivoted relative to the frame 140 at the (fifth) joint G5 and moved (between limiting stops) along a linear displacement path. Below the seat frame 100, an additional connecting arm 143 is provided, which is connected in the form of a coupling with the two wings 141, 142. For this purpose, the additional connecting arm 143 is pivoted on the front rocker 141 by means of a (sixth) joint G6. This (sixth) joint G6 is arranged between the other joints G1, G2 of the front rocker 141. Also on the rear rocker 142 of the additional connecting arm 143 is pivotally articulated by means of a (seventh) joint G7. This (seventh) joint G7 is disposed between the other joints G3, G4 of the rear rocker 142. As illustrated by FIG. 2, the seat frame 100 also serves as a coupling between the two wings 141, 142. The coupling mechanism 14 thus forms a 7-joint kinematics with seven joints G1-G7.

By arranging the (fifth) joint G5 in the form of a rotary joint at the rear articulation point on the frame 140, the rear rocker 142 can be made particularly short, in particular shorter than the front rocker 141. Thus, when transferring the vehicle seat 1 into the forwarded easy-entry position, a large adjustment path in the X-axis direction is made possible at the same time as only a small stroke of the backrest part 11 in the Y-axis direction. In this case, the front rocker oscillates along a circular arc, as indicated in Fig. 2.

The arrangement of the additional connecting arm 143 leads to a coupling of the pivoting movement of the front rocker 141 with a pivoting movement of the rear rocker 142. The formation of one of the joints G1 -G5 over which the wings 141, 142 are connected to the frame 140, as a rotary push joint in that the coupling mechanism 14 is not overdetermined and in combination with the additional connecting arm 143, it is possible to make the rear rocker 142 particularly short. This results in a pivoting of the rear rocker 142 over a 12 o'clock position away only a small Z-Achsehub the rear part of the vehicle seat. 1

In an alternative embodiment, the coupling mechanism 14 does not have the connecting arm 147 and the rear rocker 142 is mounted directly on a rotary push joint on the frame 140. In this case, the (fourth) joint of the rear rocker 142 is formed as a rotary push joint.

3A and 3B show a vehicle seat V for carrying a seat occupant in a use position. The vehicle seat V comprises a seat part 10 and a backrest part 1 1, which is attached by means of fittings 13 pivotally mounted on a seat structure 102 of the seat part 10. The vehicle seat V further comprises a coupling mechanism 14 ', via which the vehicle seat V is fastened to a longitudinal adjustment device 15. The longitudinal adjustment device 15 is attached to the vehicle floor B or to be attached thereto. The vehicle seat V according to FIGS. 3A and 3B, like the vehicle seat 1 according to FIGS. 1A and 1B, can be transferred from the use position into a forward easy-entry position, as will be explained below in connection with FIGS. 4A and 4B. In addition, the vehicle seat 1 'from the use position out in a loading position (or Fold-flat position) can be transferred. This will be explained below with reference to Figs. 5A and 5B.

4A and 4B schematically show the vehicle seat 1 'with the coupling mechanism 14', wherein a lock that locks the seat structure 102 to a frame 140 or a part of the longitudinal adjustment device 15 has already been released. The fittings 13 are locked against pivoting of the backrest part about the pivot axis of the fittings 13. The back frame 1 10 of the backrest part 1 1 is thus locked to the seat structure 102, which is illustrated in Fig. 4A based on several standing for the seat structure 102 connecting lines. The coupling mechanism 14 'comprises a front rocker 141 and a rear rocker 142, by means of which the vehicle seat 1' from the use position (see Fig. 4A) in the vorwenkte position (see Fig. 4B) can be swiveled.

The front rocker 141 is articulated by means of a joint G1 on the frame 140, specifically at a front pivot point of the frame 140. At its the joint G1 to the frame 140 opposite end, the front rocker 141, a further joint G8 on which the seat structure 102nd is hinged pivotally. Between these two joints G1, G8 at the longitudinal ends of the front rocker 141, two further joints G6, G9 are provided on the front rocker 141. One of these other joints G9 is in the position of use closer to the backrest part 1 1 arranged as the other joint G6 and serves for the pivotal attachment of a pivot arm 148 on the front rocker. The two end joints G1, G8 and the joint G9 to the pivot arm 148 are arranged according to an obtuse angle.

The pivot arm 148 is pivotally connected to a seat frame 100 via another hinge G2. The seat frame 100 supports a seat cushion (not shown). The seat frame In the present example, 100 comprises two longitudinal members, which are connected at their rear end via a transverse tube and at their front end via a seat shell. Between the cross tube and the seat a spring mat is hung, which supports the seat cushion together with the seat. The two longitudinal members of the seat frame 100 are supported by the coupling mechanism 14. At the front end of the seat frame 100, this is done via the pivot arm 148 and the front rocker 141st

In the position of use (see Fig. 4A) and the folded position (see Fig. 4B), the joints G2, G8, via which the front rocker 141 are hinged to the seat structure 102 and the pivot arm 148 on the seat frame 100, coaxial with each other aligned. This coaxial alignment is maintained (by the locking of the fitting 13) even when pivoting the vehicle seat V in the vorwenkte position. This has the advantage that no relative movement between the seat frame 100 and the seat structure 102 takes place during the pivoting. As a result, wear of the vehicle seat V can be reduced. The two coaxially oriented joints G2, G8 are hinges about which the seat frame 100 and the seat structure 102 pivot upon transfer to the folded-up position.

In the use position, the joints G2, G8, via which the front rocker 141 are hinged to the seat structure 102 and the pivot arm 148 on the seat frame 100, seen along the X-axis of the vehicle closer to the backrest part 1 1 arranged as the joint G1, at the front rocker 141 is hinged to the frame 140. When transferring the vehicle seat V in the vorwenkte position the front rocker 141 thus passes over a 12 o'clock position.

At an arranged between the end-side joints G1, G8 of the front rocker 141 joint G6 an additional connecting arm 144 (in the present case at one end) pivotally articulated. The two end joints G1, G8 and the joint G6 to the additional connecting arm 144 are arranged at an obtuse angle. This angle is greater than the angle between the two end joints G1, G8 and the joint G9 to the pivot arm 148. The additional connecting arm 144 is pivotally and slidably mounted on the frame 140 (in this case at its other end) at a further joint G4. For this purpose, this joint G4 is designed as a rotary push joint and in the present case comprises a link K in the form of a straight-line oblong hole. In the backdrop K, a pin or bolt is pivotally and slidably disposed. Furthermore, the rear rocker 142 is pivotally and displaceably articulated on the same joint G4 designed as a rotary push joint. In the present case, the rear rocker 142 is mounted on the same pin or bolt as the additional connecting arm 144. This results in a coupling of the movements of the two wings 141, 142. If, for example, the front rocker 141 pivoted out of the use position forward pulls the additional connecting arm 144th the rear rocker 142 in the rotary push joint, concretely in the slot, with forward. The combination of the rotary thrust joint G4 with the additional connecting arm 144 makes it possible to make the rear rocker 142 particularly short. With a pivoting of the rear rocker 142 out of the use position over a 12 o'clock position, only a small Z-axis stroke of the rear part of the vehicle seat 1 follows at a comparatively large stroke along the X-axis.

The rear rocker 142 is pivotally connected to the seat structure 102 at a joint G3 (in this case at its opposite end as the pivot joint G4 formed). The seat structure 102 carries the seat frame 100 in the rear region of the vehicle seat V via a control rocker 146.

When transferring the vehicle seat V in the vorwenkte position thus pivot the two wings 141, 142 forward and overrun each a 12 o'clock position. The additional connecting arm 144 pulls the rear rocker 142 in the backdrop K additional forward. The two wings 141, 142 and the pivot arm 148 are pivoted relative to the seat part 10. Without a large stroke of the backrest part 1 1 along the Z-axis of the vehicle seat V is transferred in a particularly space-saving manner in the vorwenkte position.

The drive of the movement of the vehicle seat V of the use position in the vorwenkte position and vice versa can be done manually. Alternatively, and as shown in Figures 3A and 3B, the drive is by means of a drive means 17, e.g. comprises an electric motor. In the present case, the drive device drives via a toothing a rotation of a cross member, which is non-rotatably connected to the respective front rocker 141 (on both sides of the vehicle seat 1 '). With the described coupling mechanism 14, a single drive device 17 is sufficient for this purpose, which allows a particularly simple structure.

FIGS. 5A and 5B illustrate how the vehicle seat V can be transferred from the use position (FIG. 5A) into a further non-use position, namely a loading position is. FIG. 5A corresponds to FIG. 4A, but the vehicle seat is locked to the frame 140 by means of a lock. For example, the latch may lock the seat structure 102 to the frame 140. The coupling mechanism 14 'comprises a coupling lever 145, which is articulated via a joint G10 pivotally mounted on the backrest part 1 1. Specifically, the back frame 1 10 comprises a control lever 1 1 1, which is arranged in the use position substantially along the backrest longitudinal axis (which extends from the headrest to the fitting 13) in a straight line extension below the fitting 13.

At its end remote from the control lever 1 1 1 of the coupling lever 145 is pivotally connected via a joint G1 1 on the control arm 146. The control rocker 146 includes a first rocker arm 146A and a second rocker arm 146B. Between the two rocker arms 146A, 146B, the control rocker is pivotably hinged to a frame G13 on the frame 140 or to the seat structure 102 (which in turn is locked to the frame 140). This joint G13 thus serves as Gestellanlenkung.

To optimize the kinematics of the coupling mechanism 14 ', the first and second rocker arm 146A, 146B of the control rocker subtend an obtuse angle therebetween (which is open rearwardly in the use position).

The control lever 1 1 1 is pivotally articulated to the second rocker arm 146 B. The first rocker arm 146A is articulated at its end facing away from the Gestellanlenkung G13 via a joint G12 on the seat frame 100, in this case in the region of a rear end of the seat frame 100, specifically at the rear end of the side member.

In the position of use, the fitting 13, the joint G10 between the control lever 1 1 1 and the coupling lever 145 and the joint G1 1 between the coupling lever 145 and the control rocker 146 (more precisely their respective pivot axes) form an obtuse angle, in particular not along arranged a straight line. If, from this position, the backrest part 1 1 is pivoted forwards towards the seat part 10 by a pivot axis predefined by the fitting 13, the angle between these three points (joints G 1 1, G 12 and fitting 13) becomes greater until the three points along one Straight lines are aligned. In a further Vorschwenken the backrest part 1 1, the three points again form an angle, which is now open but in the other direction than in the position of use. As a result, the coupling lever 145 presses the control rocker 146 only in a pivoting direction that initially displaces the rear end of the seat frame 100 backwards and downwards. In a further Vorschwenken the backrest part 1 1 pulls the control lever 1 1 1 the coupling lever 145 (to the rear). As a result, there is a change in direction of the pivoting movement of the control rocker 146. The control rocker 146 thus performs when changing the backrest part 1 1 a change of direction.

If the backrest part 1 1 further folded forward, pivots the first swing arm 146A of the control arm 146 forward and passes over a 12 o'clock position. At the same time pivots the pivot arm 148 at the joint G9 on the front rocker 141 forward. Here, the seat frame 100 is displaced forward and thereby lowered. As a result, the backrest part 1 1 can be folded deeper, so that a particularly space-saving loading position is made possible. The kinematics of the coupling mechanism 14 'is set such that is aligned in a dead center position of the coupling lever 145 in rectilinear extension to the control lever 1 1 1, so starting from the dead center in one direction of the deflection of the coupling lever 145 of the seat frame 100 in a stable position without Use of a lock is locked when the backrest part 1 1 is in the use position. On the vehicle seat V acting crash forces can not lead to an unwanted lowering of the seat frame 100, while in a deflection of the coupling lever 145 in the other direction after passing through the dead center of the seat frame is lowered to a substantially horizontal orientation of the backrest part 1 1 in the To achieve loading position.

Preferably, the backrest portion 1 1 is in the use position in a range between a front and rear stop ver and adjustable so that the orientation of the backrest portion relative to the seat frame 100 can be adjusted individually, for example, to find a comfort position of the seat occupant.

The movement from the use position to the loading position and vice versa is driven by means of a drive device. By synchronizing the movement of the backrest part 1 1 with the movement of the seat frame 100 in this case a single drive device is sufficient. Alternatively, this movement could also be driven manually. The vehicle seat 1 'thus comprises two drive devices with which the vehicle seat V can be transferred both from the use position to the forward pivoted position, as well as from the position of use in the loading position. The coupling mechanism 14 'thus provides two different functionalities, namely both a transfer to the vorwenkte position and a transfer to the loading position.

The components of the coupling mechanism 14 ', which allow the transfer of the vehicle seat 1' in the vorwenkte position are decoupled from those components of the coupling mechanism 14 ', which allow the transfer of the vehicle seat V in the loading position. In particular, the components of the two functionalities do not affect the number of degrees of freedom of the components of the other functionality.

FIG. 6 shows a detail of another vehicle seat according to the invention with a coupling mechanism 14. Here, matching components are identified by identical reference numerals. A drive device 17 provided in the vehicle seat of FIG. 6 is shown here with a drive motor 170 and a gear 171. The drive means 17 transmits thereby upon actuation of the drive means 17 a torque for adjusting the vehicle seat 1 in the region of the joint G1 in the front rocker 141. Upon actuation of the drive means 17 is thus a torque for the adjustment of the vehicle seat in the vorwenkte position or back into the Use positions initiated on the front rocker 141.

The drive device 17 designed non-self-locking. For the connection of the front rocker 141 with the drive means 17, an overload clutch 3 is provided in particular. This overload clutch 3 serves as an additional decoupling mechanism to decouple the drive means 17 as needed from the coupling mechanism 14. In this way, the vehicle seat 1 is also adjustable independently of an actuation of the drive motor 170 of the drive device 17 by means of the coupling mechanism 14.

To assist an adjustment movement of the vehicle seat by means of the coupling mechanism 14 in the vorwenkte position is in the vehicle seat of the figure 6 further provided a torsion spring 2. This torsion bar spring 2 is rotatably connected to the joint G1 with the front rocker 141. About the biased in the direction of the pre-pivoted position torsion spring 2 is thus on the overload clutch 3 away a mechanically generated torque on the front rocker 141 and thus on the coupling feminism 14 to support a manual or power-operated adjustment of the vehicle seat 1 in the vorwenkte position.

In order to avoid an undesired adjustment of the vehicle seat 1, in particular during a journey of the vehicle in which the vehicle seat 1 is mounted, a locking device 4 with a lock is provided in the vehicle seat 1 of FIG. By means of the lock of the locking device 4, the coupling mechanism 4 is secured between a rail of the longitudinal adjustment device 15 and the seat base or a base assembly of the vehicle seat 1 against an adjustment. Thus, the coupling mechanism 14 is locked by means of the locking device 4. The locking device 4 can in this case be actuated manually and / or electrically to release the unlocking via an actuator.

As illustrated with reference to FIG. 7, a coupling mechanism 14, 14 'of a vehicle seat 1, 1' is designed, for example, such that the seat components present above the seat frame, and in particular the backrest 1 1, move in the same direction as the vehicle seat 1, 1 ' Do not move forward over a dead center. An adjustment over a dead center, as outlined by an adjustment R ^* in Figure 7, leads to binding, which should be avoided in particular for a manual adjustment of the vehicle seat 1, 1 'in a panic case.

The adjustment of the backrest 1 1 should rather take place exclusively in a functional sector FS, which is defined by a vertical V and a horizontal H, which intersect at the front lying in the direction F section of the backrest 1 1. An initial direction of a movement vector of the backrest 1 1 starting at the upper backrest head of the backrest 1 1 is thus in an area above the horizontal H and in the direction of travel F in front of the vertical V. A coupling mechanism 14, 14 'is then designed such that the backrest 1 1 follows when adjusting the vehicle seat 1, 1' in the vorwenkte position a continuous, continuous adjustment R without turning points and changes in direction. The forward facing adjustment path R, which passes through the functional sector FS, thus has no Dead center on. In an adjustment of the vehicle seat 1. V from the use position shown in Figure 7 in the vorwenkte position thus performs the backrest 1 1 due to the corresponding design of the coupling mechanism 14, 14 'an adjustment along the adjustment path R, without traversing a dead center. The adjustment of the backrest 1 1 runs steadily forward (relative to the direction of travel F).

LIST OF REFERENCE NUMBERS

1, 1 'vehicle seat

10 seat part

100 seat frame

101 seat cushion

102 seat structure

1 1 backrest part

1 10 backrest frame

1 1 1 control lever

12 headrest

13 fitting

14, 14 'coupling mechanism

140 frame

141 front swingarm

142 rear swingarm

143 additional connecting arm

144 additional connecting arm

145 coupling lever

146 control swing

146A first swing arm

146B second swing arm

147 connection arm

148 swivel arm

15 longitudinal adjustment

16 lock

17 drive device

170 drive motor

171 gearbox

2 torsion bar spring

3 overload clutch (decoupling mechanism)

4 locking device

B vehicle floor

G1 -G12 joint

G13 joint (frame linkage)

F direction of travel

FS functional sector H horizontal

K scenery

R, R * adjustment track

T dead center

V vertical

Claims

claims

1 vehicle seat (1, 1 '), comprising a seat part (10), an adjustable on the seat part (10) arranged backrest part (1 1) and a coupling mechanism (14, 14'), by means of which the vehicle seat (1, 1 ') of a position of use can be converted into a forward position and includes:

a frame (140) which carries the seat part (10) and via which the seat part (10) is to be connected to a vehicle floor (B),

- A front rocker (141) which is articulated by means of a hinge (G1) on the frame (140) and at least one further joint (G2, G8, G9) is coupled to the seat part (10), and

- A rear rocker (142) which is coupled via at least one joint (G3) to the seat part (10) and via which the seat part (10) via at least one further joint (G4, G5) is coupled to the frame (140) in which one of the joints (G4, G5), via which the rockers (141, 142) are coupled to the frame (140), is designed as a rotary push joint, characterized in that the coupling mechanism (14, 14 ') has an additional connecting arm (14). 143, 144) over which the front rocker (141) is coupled to the rear rocker (142).

2 vehicle seat (1, 1 ') according to claim 1, characterized in that the joint formed as a rotary push joint (G4, G5) comprises a link (K).

3 vehicle seat (1, 1 ') according to claim 2, characterized in that the link (K) on one of the rockers (141, 142), on the seat frame (100) or on the frame (140) is formed.

4. Vehicle seat (1, 1 ') according to any one of claims 2 or 3, characterized in that the link (K) is rectilinear.

5. Vehicle seat (1, 1 ') according to one of the preceding claims, characterized in that the additional connecting arm (143; 144) is articulated by means of a joint (G6) on the front rocker (141) of the remaining joints (G1 , G2, G9) of the front rocker (141) is spaced.

6. Vehicle seat (1, 1 ') according to any one of the preceding claims, characterized in that the additional connecting arm (143) is articulated by means of a joint (G7) on the rear rocker (142) of the remaining joints (G3, G4 ) of the rear rocker (142) is spaced.

7. Vehicle seat (1, 1 ') according to one of claims 1 to 5, characterized in that the additional connecting arm (144) is hinged to that joint (G4) of the rear rocker (142), the rear rocker (142) with the Frame (140) couples.

8. Vehicle seat (1, 1 ') according to one of the preceding claims, characterized in that the coupling mechanism (14, 14') forms a 7-joint kinematics.

9. Vehicle seat (1, 1 ') according to one of the preceding claims, characterized by a fitting (13) for pivoting the backrest part (1 1) relative to the seat part (10), wherein the fitting (13) in the position of use and / or in the vorwenkten position of the vehicle seat (1, 1 ') above the coupling mechanism (14, 14') is arranged.

10. Vehicle seat (1 ') according to one of the preceding claims, characterized in that the coupling mechanism (14') for transferring the vehicle seat (1 ') into a loading position comprises:

a control rocker (146) connecting a first rocker arm (146A) connecting a seat frame (100) of the seat part (10) to a frame link (G13), formed on the frame (140) or on a with the frame (140) lockable seat structure (102), and a second swing arm (146 B), and

- A coupling lever (145) via a joint (G10) with the backrest part (1 1) and via another joint (G1 1) with the second swing arm

(146 B) of the control rocker (146) is connected, so that the distance of the seat frame (100) from the frame (140) when folding back or forth of the backrest part (1 1) is adjusted.

1 1. Vehicle seat (1 ') according to claim 10, characterized in that the coupling lever (145) via the joint (G10) with a control lever (1 1 1) of the backrest part (1 1) is connected, which is eccentric to the axis of rotation of a fitting (13) is arranged, by means of which the backrest part (1 1) relative to the seat part (10) is pivotable.

12. Vehicle seat (1 ') according to any one of claims 10 or 11, characterized in that the coupling mechanism (14') locks the seat frame (100) in the use position in a stable position and upon folding in of the backrest part (11) the use position passes over a dead center.

13. Vehicle seat (1 ') according to claims 1 1 and 12, characterized in that the coupling lever (145) in the dead center of the coupling mechanism (14') aligned in a straight line extension to the control lever (1 1 1) of the backrest part (1 1) is.

14. Vehicle seat (1 ') according to one of claims 10 to 13, characterized in that the coupling mechanism (14') is structured and dimensioned such that when passing through the dead center position during the forward lapping of the backrest part (1 1) the control rocker (146) first in a direction of rotation and further folding the backrest part (1 1) in the opposite direction of rotation about the Gestellanlenkung (G13) is pivoted.

15. Vehicle seat (1 ') according to one of claims 10 to 14, characterized in that the control rocker (146) in the use position below the backrest part (1 1) and along a longitudinal extent of the backrest part (1 1) predetermined backrest longitudinal axis is arranged ,