CN114228578B

CN114228578B - Adjusting device for a vehicle seat, seat cushion frame and vehicle seat

Info

Publication number: CN114228578B
Application number: CN202210019505.7A
Authority: CN
Inventors: 费超; 钮钟丽
Original assignee: Yanfeng International Seating Systems Co Ltd
Current assignee: Yanfeng International Seating Systems Co Ltd
Priority date: 2022-01-10
Filing date: 2022-01-10
Publication date: 2022-12-13
Anticipated expiration: 2042-01-10
Also published as: CN114228578A; WO2023130658A1

Abstract

The present application relates to an adjustment device for a vehicle seat, comprising: a bracket member (1) configured to carry a seat portion of a vehicle seat; a link mechanism (10) including a first link (11) hinged at a first hinge portion with a front region of a bracket member having an initial position in a stowed posture of the link mechanism and being convertible between the stowed posture and a deployed posture, the bracket member being lifted from the initial position in the deployed posture of the link mechanism; a drive device (20) configured to drive the first link, the drive device being forward of the first articulation of the first link with the bracket member and configured to: the driving force of the driving means is converted into a pulling force that causes the first link to rotate forward about the first hinge portion to convert the link mechanism from the stowed posture to the deployed posture. The application also relates to a seat cushion frame and a vehicle seat comprising the adjusting device.

Description

Adjusting device for a vehicle seat, seat cushion frame and vehicle seat

Technical Field

The present application relates generally to the field of vehicles and, more particularly, to an adjustment device for a vehicle seat, a seat cushion frame including the adjustment device, and a vehicle seat including the seat cushion frame.

Background

With the development of vehicle technology, personalized functions of vehicles are continuously developed and perfected. Vehicle seats are important components of vehicles and are intended to provide good comfort. To accommodate different occupants (e.g., occupants of different heights and sizes) and different seating postures, a wide variety of adjustability of the vehicle seat is desired. For example, for occupants of different leg lengths, it is desirable that the front end of the seat cushion of the vehicle seat can be raised and lowered as needed so that a proper posture can be provided for the legs of the occupant. When the leg portion of the occupant can be fully supported by the seat, a so-called zero gravity state can be achieved in which the occupant can feel relaxed.

Patent document CN111216606a discloses a known adjustment device for a vehicle seat, which includes a drive device provided below a seat cushion frame and behind a link mechanism, which causes the link mechanism to shift from a stowed posture to a deployed posture by applying a pushing force from the rear toward the front, and thereby causes a bracket member to be lifted from an initial position to raise the height of the front end of the seat cushion.

Disclosure of Invention

The applicant of the present invention found in research and development of products that the adjusting devices for vehicle seats known from the prior art can result in vehicle seats having a greater structural height and a smaller adjustment capacity with respect to the seat cushion inclination.

The object of the present application is to provide an adjusting device for a vehicle seat, by means of which the compactness and the adjustability of the vehicle seat can be improved.

It is also an object of the present application to provide a seat cushion frame comprising an adjustment device and a vehicle seat comprising a seat cushion frame.

A first aspect of the present application relates to an adjustment device for a vehicle seat, the adjustment device including:

a bracket member configured to carry a seat portion of a vehicle seat;

a link mechanism including a first link hinged at a first hinge portion with a front region of a bracket member having an initial position in a stowed posture of the link mechanism and being convertible between the stowed posture and a deployed posture from which the bracket member is lifted in the deployed posture of the link mechanism;

a drive device configured to drive the first link;

wherein in the stowed position of the linkage mechanism, the drive means is forward of the first hinge and the drive means is configured to: the driving force of the driving means is converted into a pulling force that causes the first link to rotate forward about the first hinge portion to convert the link mechanism from the stowed posture to the deployed posture.

In such an adjusting device, the drive device is forward-mounted, and the space below the front region of the seat cushion frame can be utilized, as compared with the known prior art, so that the vehicle seat having the adjusting device can have a reduced height dimension.

Furthermore, in the known prior art, in order to lift the seat of the vehicle seat from the initial position, the drive means need to exert a thrust from the rear towards the front, the adjustment means having a limited adjustment capacity while avoiding movement interference. The adjusting device according to the invention can have an increased adjustability, allowing the seat part of the vehicle seat to be adjusted with an increased inclination, compared to the known prior art.

In some embodiments, the linkage mechanism may include at least two links.

In some embodiments, the linkage mechanism may comprise a crank-slider mechanism.

In some embodiments, the linkage mechanism may further comprise a second link, the second link and the first link being hinged at a second hinge, and the second link further having a third hinge.

In some embodiments, the linkage may be configured such that, viewed in the longitudinal direction of the adjustment device, in the stowed position of the linkage, the first articulation is between the second articulation and the third articulation.

In some embodiments, each hinge may be disposed on a respective end of a respective link. This may minimize the length dimension of the link.

In some embodiments, the second link may be a bent rod.

In some embodiments, the inner side of the curved bar may face upward in the stowed position of the linkage mechanism.

In some embodiments, the first hinge may be above an inner side of the curved bar in a stowed position of the linkage mechanism.

In some embodiments, the adjustment device may comprise two bracket members arranged side by side in the transverse direction, each bracket member being provided with the link mechanism.

In some embodiments, the two bracket members may be interconnected in the front region by a first cross member. For example, the first cross member is welded or connected with the respective bracket members with fastening elements.

In some embodiments, the drive device may be mounted to the first cross member.

In some embodiments, the first cross member may be configured as an anti-dive bar for a vehicle seat. Typically, the vehicle seat may be provided with an anti-dive bar. In contrast to the known prior art, it is therefore possible to dispense with a separate crossbar for mounting the drive, and to use the crossbar which is present in the vehicle seat anyway and serves as the anti-dive bar.

In some embodiments, the first cross member may be a square tube.

In some embodiments, the adjusting device may comprise two bracket members arranged side by side in the transverse direction, each bracket member being provided with the link mechanism, the first links of the two link mechanisms may be interconnected by a second cross member, the driving force of the driving device being transmittable to the two first links via the second cross member.

In some embodiments, the second cross member may constitute a pivot axis for the first articulation, wherein the bracket member is rotatable about the pivot axis, and the first link is fixedly connected to the pivot axis, e.g. welded.

In some embodiments, the second cross member may be a round tube.

In some embodiments, the second cross member may be supported on an inner side of the curved bar in a stowed position of the linkage mechanism.

In some embodiments, the first cross member may be forward of the second cross member in the stowed position of the linkage mechanism.

In some embodiments, the first cross member may be above the second cross member in the stowed position of the linkage mechanism.

The adjustment means may comprise a lead screw and nut mechanism, the drive means being capable of applying a pulling force to the second cross member via the lead screw and nut mechanism to cause the first link to rotate forwardly about the first hinge portion to convert the link mechanism from the stowed position to the deployed position.

In some embodiments, the adjustment means may comprise a rack and pinion mechanism to transmit the driving force of the drive means to the second cross member in the form of a pulling force.

In some embodiments, the adjustment device may comprise a wire rope transmission to transmit the tension of the drive device to the second cross member. Typically, since the flexible cable can only transmit tensile forces but not compressive forces, the adjustment device may additionally comprise a return spring to return the linkage towards the stowed position.

In some embodiments, the first cross member may have a drive mount that receives a drive.

In some embodiments, the drive mount may be mounted to the first cross member at a substantially intermediate position of the first cross member, as viewed in the transverse direction.

In some embodiments, the drive device mount can be configured such that a spindle of the spindle-nut mechanism, which is drivable in rotation by the drive device, has a first axis of rotation extending transversely.

In some embodiments, the second cross member may have a nut mount that receives a nut of an feed screw-nut mechanism.

In some embodiments, the nut support may be configured such that the nut of the feed screw-nut mechanism has a second axis of rotation extending laterally.

In some embodiments, the first and second axes of rotation may be parallel to each other and perpendicular to the longitudinal axis of the lead screw.

In some embodiments, the rotational energy of the screw is converted into movement of the nut along the screw.

In some embodiments, the drive mount may be disposed at a front side of the first cross member in the stowed posture of the link mechanism, and the first rotation axis may be in front of and below the first cross member.

In some embodiments, the nut bracket may be disposed at a rear side of the second cross member in the stowed posture of the link mechanism, and the second rotation axis may be located rearward and below the second cross member.

In some embodiments, the second axis of rotation may be forward and downward of the second cross member in the deployed position of the linkage mechanism.

In some embodiments, the lead screw may extend obliquely downward from the first cross member toward the second cross member in the stowed position of the linkage mechanism.

In some embodiments, the adjustment device may include a base.

In some embodiments, the second link may be hinged to the base at a third hinge.

In some embodiments, the base may include two rails, each rail mating with one of the bracket members.

In some embodiments, the drive means may be an electric or manual drive means. For example, the manual drive device may comprise an operating handle. For example, the electric drive may comprise an electric motor.

In some embodiments, the bracket member may be configured as a bracket plate.

In some embodiments, the support member may be configured as a truss beam that may include two generally parallel long rods and a number of short rods welded to the two long rods between the two long rods.

In some embodiments, the linkage mechanism is capable of rotating through an angle of at least 15 °, such as an angle of about 20 ° or more, when the linkage mechanism transitions from the stowed position to the deployed position.

A second aspect of the present application relates to a seat cushion frame for a vehicle seat, which includes the adjusting device for a vehicle seat according to the first aspect.

In some embodiments, the seat cushion frame may further comprise a further adjustment device assigned to the rear region of the bracket member, which is configured for manipulating the bracket member in the rear region of the bracket member.

A third aspect of the present application relates to a vehicle seat having the seat cushion frame according to the second aspect.

In the sense of the present application, the term "vehicle" can be understood in general as a means of transport, such as a land vehicle, a water vehicle (or a ship), or an air vehicle (or an aircraft), in particular a motor vehicle, such as a passenger car or a truck.

For example, the term "vehicle seat" is to be understood in a generic sense as a seat for a vehicle, which may be, for example, a seat of a motor vehicle, a seat of a ship, a seat of an aircraft, etc.

The features already mentioned above, those to be mentioned below and those shown in the figures individually can be combined with one another as desired, provided that the combined features are not mutually inconsistent. All possible combinations of features are the subject matter of the technology explicitly described herein. Any of a plurality of sub-features included in the same sentence may be applied independently, not necessarily together with other sub-features.

Drawings

Exemplary embodiments will now be described with reference to the accompanying schematic drawings. Wherein:

fig. 1 is a perspective view of a seat cushion frame in an initial state according to an embodiment of the present application.

Fig. 2 is a partially enlarged view of the seat cushion frame of fig. 1 from another perspective.

Fig. 3 and 4 are different perspective views of the seat cushion frame of fig. 1 in a raised state.

Fig. 5 is a side view of the seat cushion frame of fig. 1 in another state.

Fig. 6 is a kinematic diagram of the seat cushion frame.

Detailed Description

Exemplary embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood, however, that the present application may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. It is also to be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments. Throughout the drawings, like reference numbers indicate identical or functionally identical elements.

Fig. 1 is a perspective view of a seat cushion frame according to an embodiment of the application in an initial state, fig. 2 is a partial enlarged view of the seat cushion frame of fig. 1 from another perspective, and fig. 3 and 4 are different perspective views of the seat cushion frame of fig. 1 in a raised state, wherein in fig. 4 additionally a shell 30 for a seat of a vehicle seat is depicted, which shell can be mounted to the bracket member 1. An adjusting device 100 for a vehicle seat is integrated in the seat cushion frame. The seat cushion frame is configured to seat and support a seat cushion of a vehicle seat. The vehicle seat may further include a backrest, and the backrest may have a backrest frame. The illustrated seat cushion frame can be connected, for example rigidly or rotatably connected, in its rear region to a not illustrated backrest frame.

The seat cushion frame shown and the vehicle seat comprising the seat cushion frame can be adapted for use in a motor vehicle, in particular a passenger car or a wagon. It will be appreciated that the seat cushion frame shown and the vehicle seat including the seat cushion frame may also be applied to other transportation vehicles such as an aircraft or a ship.

The seat cushion frame can comprise two carrier elements 1 arranged next to one another in the transverse direction y, and these carrier elements 1 can be designed as carrier plates. The two bracket members 1 can be connected to each other in their front regions by means of a first cross member 2, for example the two bracket members 1 can be welded to the first cross member 2, respectively. The first cross member 2 may be configured as a square tube and serves as a dive bar for a vehicle seat. The two bracket members 1 may be connected to each other in their rear regions by a third cross member 4. Two carrier elements 1 can be mounted in a rotatable manner on a cross member 4, and the third cross member 4 can be designed as a circular tube. The two bracket members 1 together with the first cross member 2 and the third cross member 4 may constitute a frame on which a seat part of the vehicle seat may be seated and supported.

The seat frame is provided in its front region with the already mentioned adjusting device 100, wherein the two carrier elements 1 can each be provided in their front region with a link mechanism 10. The link mechanism 10 is capable of switching between the stowed posture and the deployed posture. The stowed position of the link mechanism 10 is shown in fig. 1 and 2, and the deployed position of the link mechanism 10 is shown in fig. 3 and 4. The holder member 1 has an initial position in the stowed posture of the link mechanism 10, and is lifted from the initial position in the vertical direction z in the deployed posture of the link mechanism 10.

The linkage 10 may include a first link 11 and a second link 12. The first link 11 is articulated, in particular at one end of the first link 11, at a first articulation 13 with a front region of the bracket member 1. The first link 11 is articulated to the second link 12 at a second articulation 14, which can be realized in particular at the other end of the first link 11 and at one end of the second link 12. The second link 12 also has a third hinge 15. The second link 12 can be articulated with the base at a third articulation 15, which can be realized in particular at the other end of the second link 12. The second link 12 may be a bent lever whose inner side faces upward in the stowed posture of the link mechanism 10, and the first hinge portion 13 is located above the inner side of the bent lever. In the longitudinal direction x, the first hinge 13 is between the second hinge 14 and the third hinge 15. The first links 11 of the two linkage arrangements 10 may be interconnected by the second cross member 3. The second cross member 3 may be a circular tube and constitutes a pivot axis for the first hinging section 13, wherein the bracket member 1 is rotatable around the pivot axis, and the first connecting rod 11 is fixedly connected, e.g. welded, to the pivot axis. In the stowed posture of the link mechanism 10, the second cross member 3 may be supported on the inner side of the bent lever as the second link 12. It may be advantageous for the second link 12 to be designed as a curved lever, wherein in the stowed position of the link mechanism the seat cushion frame can have a minimized structural height, while the initial position of the seat frame can be well defined, wherein the adjusting device 100 and the bracket component 1 thereof can assume the respective initial position.

The base may comprise two rails 5 side by side in the transverse direction y, each rail being adapted to one carrier element 1. In the embodiment shown, the guide rail 5 can be an integral part of the seat cushion frame. In a non-illustrated embodiment, the guide rail 5 may not be contained in the seat frame, but rather may be a component already present in the vehicle body.

The adjustment device 100 may comprise a drive device 20. Typically, the drive means 20 may comprise an electric motor which may be operated under control, for example in accordance with a predetermined program by pressing a button, not shown, on the vehicle seat. The drive means 20 may be mounted to the first cross member 2. For this purpose, the first cross member 2 may have a drive mount 21, which receives the drive 20.

The drive means 20 may transmit a driving force to the second cross member 3 via a lead screw-nut mechanism and in turn drive the first link 11 to rotate about the first hinge 13. The feed screw-nut mechanism may comprise a feed screw 23 which can be driven in rotation by the drive means 20 and a nut 24 which can be moved along the feed screw 23. In the stowed position of the linkage 10, the lead screw 23 extends obliquely downward from the first cross member 2 toward the second cross member 3.

The drive device support 21 can be configured such that the spindle 23 has a first axis of rotation 22 extending transversely, so that during driving the spindle 23 can rotate about its longitudinal axis and pivot about the first axis of rotation 22. In the stowed posture of the link mechanism 10, the drive mount 21 is disposed on the front side of the first cross member 2, and the first rotation axis 22 is in front of and below the first cross member 2.

The second cross member 3 may have a nut holder 25. In the stowed posture of the link mechanism 10, the nut bracket 25 may be disposed on the rear side of the second cross member 3, projecting rearward and downward from the second cross member 3. The nut support 25 provides a second axis of rotation 26 for the nut 24 which can be located behind and below the second cross member 3 in the stowed position of the linkage 10 and can be moved in front of and below the second cross member 3 in the deployed position of the linkage 10 (see in particular fig. 3). During driving, the nut 24 can move along the screw 23 and pivot about the second axis of rotation 26.

When the inclination of the carrier element 1 is adjusted starting from the initial position of the carrier element 1, the drive device 20 drives the spindle 23, wherein the rotary movement of the spindle 23 is converted into a forward movement of the nut 24 along the spindle 23 or toward the drive device support 21, the drive device 20 pulls the nut 24, which is converted into a forward rotation of the first link 11 about the first articulation 13, and thus converts the linkage 10 from the stowed position shown in fig. 1 and 2 into the deployed position shown in fig. 3 and 4, in which the front region of the carrier element 1 is raised, so that the carrier element 1 and thus the not shown seat of the vehicle seat have a corresponding inclination. It goes without saying that the link mechanism 10 does not necessarily have to be switched to the predetermined final deployment posture as shown in fig. 3 and 4, but may also be switched to any intermediate posture between the predetermined stowed posture and the predetermined final deployment posture so that the holder member 1 can be adjusted to any desired inclination angle.

When returning from the raised position of the holder member 1 toward the initial position, the driving device 20 drives the lead screw 23 in reverse, wherein a reverse rotational movement of the lead screw 23 is converted into a movement of the nut 24 of the lead screw-nut mechanism rearward or away from the driving device mount 21 along the lead screw 23, the driving device 20 pushes the nut 24, which is converted into a rearward rotation of the first link 11 about the first hinge portion 13, and thereby returns the link mechanism 10 from the deployed posture as shown in fig. 3 and 4 to the stowed posture as shown in fig. 1 and 2. It goes without saying that the link mechanism 10 does not necessarily have to be returned from the predetermined final deployment posture to the stowage posture as shown in fig. 3 and 4, but may be returned to any intermediate posture between the predetermined final deployment posture and the predetermined stowage posture.

In the illustrated embodiment, the distance between the lead screw 23 and the second cross member 3 can be at least temporarily increased during the transition of the link mechanism 10 from the stowed posture to the deployed posture, without the lead screw 23 interfering with the second cross member 3. The adjustment device 100 can achieve a large angular adjustment range of the bracket member 1. For example, the angular adjustment range may be ≧ 15 °, such as about 20 °, or even greater. Furthermore, the drive device 20 and the spindle-nut mechanism can make full use of the large space which is present in itself below the front region of the seat cushion frame, and a smaller overall height of the vehicle seat can be achieved in comparison with the known prior art in which the drive device is arranged below the middle region of the seat cushion frame. In addition, the additional transverse bar for mounting the drive can be dispensed with, and the transverse bar typically present in vehicle seats can be used as a dive bar.

In an embodiment, which is not shown, instead of the spindle-nut mechanism, a rack-and-pinion mechanism can be used as a transmission mechanism, wherein a pinion can be driven in rotation by a drive, the rotation of which can be converted into a movement of the rack pressed against the pinion by a spring element.

In another embodiment, which is not shown, instead of the spindle-nut mechanism, a wire-cable transmission mechanism can be used, wherein a wire cable can pull a nut carrier 25 as shown in fig. 1 to 4, and the linkage mechanism 10 can be provided with a return spring for returning the linkage mechanism 10 to the retracted position.

In embodiments not shown, the number of bracket members 1 and linkage mechanisms 10 may be other numbers, such as one, three or more.

A further adjustment device 200 is now described with reference to fig. 5 and 6. Fig. 5 is a side view of the seat cushion frame of fig. 1 in another state, and fig. 6 is a kinematic diagram of the seat cushion frame.

In addition to the adjusting device 100, the seat cushion frame can have a further adjusting device 200 integrated in its rear region. The adjustment device 200 can include a toothed plate 201 rotatably connected with the bracket member 1, which is hinged with the base at a hinge portion 202. The drive device 203 may be mounted to the carrier member 1 and may drive a gear engaged with the toothed plate 201 such that a rear region of the carrier member 1 may be shifted between an initial position and a raised position. In fig. 1 to 4, an initial position of the adjusting device 200 is shown, in which the rear region of the bracket member 1 is in a corresponding lowered initial position. Fig. 5 is a side view of the seat cushion frame of fig. 1 in another state, in which the adjusting device 100 adjusts the front region of the bracket member 1 to a predetermined raised position, and the adjusting device 200 adjusts the rear region of the bracket member 1 to a predetermined raised position. Fig. 5 also additionally shows a housing part 30 of a seat part of a vehicle seat.

The two carrier members 1 can be provided in their rear regions with identical toothed plates 201 which are articulated on the one hand to the respective carrier member 1 and on the other hand to the respective guide rail 5. However, only one of the carrier elements 1 can be provided with a drive device 203. The drive of the toothed plate 201 by the drive means 203 associated with said one bracket member 1 can be transmitted to the toothed plate associated with the other bracket member 1 via the third cross member 4.

As can be seen from the kinematic diagram of fig. 6, in the front region of the seat frame, the screw 23 which is pivotable about the first axis of rotation 22 relative to the bracket member 1 can, when driven, cause the nut 24 which is pivotable about the second pivot track 26 relative to the first link 11 to move along the screw 23, which movement can cause the first link 11 to rotate about the first articulation 13 and thus the linkage mechanism 10 of the adjustment device 100 can be switched between the stowed and deployed positions, as a result of which the front region of the bracket member 1 can be raised and lowered in the vertical direction z. In the rear region of the seat cushion frame, the toothed plate 201 forms a link which is articulated on the one hand to the carrier member 1 and on the other hand to the guide rail 5.

By the cooperation of the adjustment means 100 and the adjustment means 200, the bracket member 1 is raised in fig. 5 compared to the initial state of the bracket member 1 as shown in fig. 1 and 2, but the inclination of the bracket member 1 remains unchanged.

In an embodiment which is not shown, the seat cushion frame can be provided without the adjusting device 200 in the rear region, wherein the seat cushion frame is simply connected in a hinged manner to the base in the rear region of the support element 1.

In another embodiment, not shown, the seat cushion frame can be provided in the rear region with an adjusting device identical or similar to the adjusting device 100, and the seat cushion frame can be adjusted to a suitable height and inclination by the cooperation of these two identical adjusting devices.

It is to be understood that the terminology used in the description is for the purpose of describing particular embodiments only, and is not intended to limit the application. All terms used in the specification, unless otherwise defined, have the meanings commonly understood by those skilled in the art. Well-known functions or constructions may not be described in detail for brevity or clarity.

As used in this specification, the singular forms "a", "an" and "the" include plural referents unless the content clearly dictates otherwise. The terms "comprising," "including," and "containing" when used in this specification specify the presence of stated features, but do not preclude the presence or addition of one or more other features. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.

In the description, when an element is referred to as being "on," "attached" to, "connected" to, "coupled" to, or "contacting" another element, etc., another element may be directly on, attached to, connected to, coupled to, or contacting the other element, or intervening elements may be present. In contrast, when an element is referred to as being "directly on," "directly attached to," directly connected to, "directly coupled to," or "directly contacting" another element, there are no intervening elements present. In the description, one feature is disposed "adjacent" another feature, and may mean that one feature has a portion overlapping with or above or below an adjacent feature.

It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. Thus, a first element could be termed a second element without departing from the teachings of the present inventive concept.

Finally, it is pointed out that the above-described embodiments are only intended to be understood by the present application and do not limit the scope of protection of the present application. It will be apparent to those skilled in the art that modifications may be made in the above-described embodiments without departing from the scope of the application.

Claims

1. An adjustment device for a vehicle seat, the adjustment device comprising:

two bracket members (1) arranged side by side in a lateral direction and configured for carrying a seat portion of a vehicle seat;

two link mechanisms (10), each assigned to one of the carrier elements, each link mechanism comprising a first link (11) which is articulated with the front region of the respective carrier element at a first articulation (13) and further comprising a second link (12) and being switchable between a stowed position and a deployed position, the second link and the first link being articulated at a second articulation (14), and the second link further having a third articulation (15), wherein the carrier elements have an initial position in the stowed position of the link mechanism and the carrier elements are raised from the initial position in the deployed position of the link mechanism; and

a drive device (20) configured for driving the first link;

it is characterized in that the preparation method is characterized in that,

the drive device is forward of the first articulation and the drive device is configured to: the drive force of the drive device is converted into a pulling force which causes the first links to rotate forward about the first articulations in order to convert the linkage from the stowed position into the deployed position, wherein the first links of the two linkage arrangements are connected to one another by means of a second transverse member (3) which forms a rotary shaft for the first articulations, wherein the carrier member can rotate about the rotary shaft, with which the two first links are fixedly connected, and the drive force of the drive device can be transmitted to the two first links via the second transverse member.

2. The adjustment device for a vehicle seat according to claim 1, characterized in that the link mechanism is configured such that, viewed in the longitudinal direction (x), in a stowed position of the link mechanism, the first articulation is between the second articulation and the third articulation.

3. The adjustment device for a vehicle seat according to claim 1, characterized in that each hinge portion is provided on a respective end portion of a respective link.

4. The adjusting device for a vehicle seat according to claim 1, characterized in that the second link is a curved lever, an inner side of the curved lever faces upward in a stowed posture of the link mechanism, and the first hinge portion is above the inner side of the curved lever.

5. The adjusting apparatus for a vehicle seat according to claim 4, characterized in that the second cross member is supported on an inner side of the curved lever in a stowed posture of the link mechanism.

6. The adjusting apparatus for a vehicle seat according to one of claims 1 to 5, characterized in that the two bracket members are connected to one another in the front region by a first cross member (2), to which the drive device is mounted.

7. The adjustment device for a vehicle seat according to claim 6, characterized in that the first cross member is configured as a dive bar of the vehicle seat.

8. The adjusting apparatus for a vehicle seat according to claim 6, characterized in that the first cross member is located forward of the second cross member in the stowed posture of the link mechanism.

9. The adjusting apparatus for a vehicle seat according to claim 8, characterized in that the adjusting apparatus includes a lead screw-nut mechanism, and the driving apparatus is capable of applying a pulling force to the second cross member via the lead screw-nut mechanism to rotate the first link frontward about the first hinge portion to convert the link mechanism from the stowed posture to the deployed posture.

10. The adjusting apparatus for a vehicle seat according to claim 9, characterized in that the first cross member has a drive means seat (21) which receives a drive means and is configured such that a spindle (23) of a spindle-nut mechanism which is drivable in rotation by the drive means has a first axis of rotation (22) which extends transversely; and is

The second cross member having a nut mount (25) receiving a nut (24) of the feed-screw-nut mechanism and being configured such that the nut of the feed-screw-nut mechanism has a second axis of rotation (26) extending transversely;

wherein the first and second axes of rotation are parallel to each other and perpendicular to the longitudinal axis of the screw, the rotational energy of the screw being converted into a movement of the nut along the screw.

11. The adjustment device for a vehicle seat according to claim 10, characterized in that the drive device bracket is provided on a front side of the first cross member in the stowed posture of the link mechanism, and the first rotation axis is located in front of and below the first cross member.

12. The adjusting apparatus for a vehicle seat according to claim 10, wherein the nut holder is disposed on a rear side of the second cross member in the stowed posture of the link mechanism, and the second rotation axis is rearward and downward of the second cross member.

13. The adjustment device for a vehicle seat according to claim 12, characterized in that in the deployed posture of the link mechanism, the second rotation axis is in front of and below the second cross member.

14. The adjustment device for a vehicle seat according to claim 10, characterized in that the lead screw extends obliquely downward from the first cross member toward the second cross member in the stowed posture of the link mechanism.

15. The adjustment device for a vehicle seat according to any one of claims 1 to 5, characterized in that the adjustment device comprises a base, the second link being hinged to the base at a third hinge.

16. The adjusting apparatus for a vehicle seat according to any one of claims 1 to 5, characterized in that the drive means includes a motor.

17. The adjusting apparatus for a vehicle seat according to any one of claims 1 to 5, characterized in that the bracket member is constituted as a bracket plate.

18. A seat cushion frame for a vehicular seat, comprising the adjusting device for a vehicular seat recited in any one of claims 1 to 17.

19. The seat cushion frame for a vehicle seat of claim 18, further comprising an additional adjustment device assigned to a rear region of the bracket member, the additional adjustment device being configured for manipulating the bracket member in the rear region of the bracket member.

20. A vehicle seat having the cushion frame according to claim 18 or 19.