Vehicle seat with a support device and a vehicle with such a vehicle seat

Abstract

The invention relates to a vehicle seat (2) for a vehicle (1), comprising a seat frame (3), a seat surface (4) arranged on the seat frame (3), and a support device (6) which can be moved between a rest position (R) and at least one first use position (N1), with a base plate (10), a support support (20) which can be extended relative to the base plate (10), and a drive device (30) which can move the support support (20) relative to the base plate (10), characterized in that the support support (20) comprises at least a first support support member (22) and at least one further support support member (24), in that the first support support member (22) can be driven by the drive device (30) between the rest position (R) and the at least one use position (N1) and can be moved relative to the base plate (10),that the further support member (24) is movable by a mechanical coupling device (40) between the rest position (R) and the at least one use position (N1) relative to the base plate (10) and relative to the first support member (22).

Description

The invention relates to a vehicle seat according to the preamble of claim 1 and to a vehicle according to claim 10.Seat rest devices are often used as foot, calf or leg supports to improve blood circulation of the legs during travel and to improve seating comfort for passengers, especially during long travel. This further reduces the fatigue of the lower legs and relieves the spinal column. In order to make it possible to adapt to the height of the driver or passenger for an ergonomic seating position, the support devices are designed to be longitudinally adjustable.Further, since the support device should be configured to be fold out to be stowed and free the foot well, the support device is typically stowed in a rest position under a seat surface in a vertical configuration. Due to this positioning, the length of the base plate is predetermined by the installation space in the vertical direction, especially in flat vehicles.Furthermore, the support devices should be able to be operated as automatically as possible by the passengers in order to further increase comfort.For example, support devices are known which, by means of a ball joint kinematics with additional longitudinal adjustment, permit the adjustment of the support device to the passenger by decoupling a support carrier from a base plate. A disadvantage of these support devices is, in particular in the case of flat vehicles with a likewise flat foot space, that only a limited travel path is available in order to move the support device from a rest position into a usable position. As a result, the length of the support devices in the flat installation space conditions in the vehicle is also limited.In order to achieve automatic adjustment, an electric motor is often provided on the base plate, which can displace the support carrier relative to the base plate. The displacement path of the motor is defined by the length of the base plate, so that in a flat foot well the displacement path of the motor is likewise disadvantageously limited.It is an object of the present invention to specify a vehicle seat having a support device, the longitudinal adjustability of which is improved.This object is achieved by a vehicle seat having the features of claim 1. Furthermore, a vehicle having the features of claim 10 is proposed.A vehicle seat according to the invention for a vehicle comprises a seat frame, a seat surface arranged on the seat frame, and a support device which can be moved between a rest position and at least one first use position. The support device has a base plate, a support carrier that can be extended relative to the base plate, and a drive device that can move the support carrier relative to the base plate. The vehicle seat according to the invention is distinguished in that the support carrier comprises at least one first support carrier member and at least one further support carrier member, in that the first support carrier member can be driven by the drive device between the rest position and the at least one usable position and can be moved relative to the base plate, in that the further support carrier member can be moved relative to the base plate and relative to the first support carrier member by a mechanical coupling device between the rest position and the at least one usable position.This advantageously creates a support device which, because of the coupling device coupling the base plate, the first support carrier member and the further support carrier member, has a greater displacement path in a longitudinal direction of the support device, wherein only a single active drive is required in order to extend the support device telescopically into the use position.The support device serves as a support for the legs, in particular the calf and / or the feet, of passengers who take place on the vehicle seat. The support device can have a padding, which is arranged in particular between a cover of the vehicle seat and a respective support carrier. The upholstery can be divided into several separate upholstery elements or upholstery elements connected to one another, wherein in particular each of the upholstery elements can be arranged on an upholstery carrier element. The support carrier can have an unpadded support, in particular a preferably soft plastic support in each case. The support can be divided into several separate support members or support members connected to one another, wherein in particular each of the support members is arranged on a support carrier member. A support carrier member may be formed integrally with a support member. The pad or padding may be disposed directly under a cover. The trim cover may extend at least over the seat surface and the support device. The cover can be designed as a support cover and in this case can be arranged in particular separately from a cover of the seat surface. The support beams may be individually spanned by a cover.In the rest position, the support device is folded and is thus not located in a foot space usable by the passengers, but is advantageously stored under the seat surface. In order to move from the rest position into the at least one usable position, the drive device is activated, which in turn drives the first support carrier member. The drive device is preferably arranged on the base plate. Depending on the type of drive device, however, parts of the drive device can also be arranged, for example, on the seat frame. It can also be provided that the drive device is arranged completely on the seat frame and merely engages on the base plate and thus moves the base plate.The coupling device advantageously moves the at least one further support carrier member passively, i.e. purely mechanically, in particular without an additional electrical, hydraulic, pneumatic or manual drive. It can be provided here that the mechanical coupling device mechanically couples a first travel path between the base plate and the first support carrier member and at least one further travel path between the first support carrier member and the at least one further support carrier member. It can be provided that the first support member is displaced with respect to the base plate over a first extension path and that the at least one support member is displaced with respect to the base plate over a second extension path, which is different from the first extension path. The lengths of the extension paths may be linearly dependent on each other. The extension paths are preferably straight, but can also extend in a curved manner.The extension paths can be formed by rails and / or slotted guides between the base plate and the first support carrier member and between the first support carrier member and the second support carrier member. The extension paths are particularly preferably of continuous design. It can be provided in particular that the further cushioning element has a higher speed of one of the movement between the rest position and the at least one use position than the first cushioning element during a movement between the rest position and the at least one use position relative to the base plate.It can be provided that the mechanical coupling device, during a retraction movement from a use position into the rest position of the first support carrier member relative to the base plate, also causes a retraction movement of the further support carrier member relative to the base plate and wherein the mechanical coupling device, during a retraction movement from the rest position into a use position of the first support carrier member relative to the base plate, also causes a retraction movement of the further support carrier member relative to the base plate. Particularly preferably, the outward and inward travel paths can follow a straight direction, in particular in the direction of travel and / or vertical direction. In addition, a pivot drive can be arranged between the support device and the seat frame, which can be operated particularly preferably independently of the drive device. As a result, a longitudinal adjustment and a pivoting movement of the support device are advantageously decoupled from one another.Furthermore, a further support carrier member can be provided which can be displaced with respect to the further support carrier member. Accordingly, further support carrier members can also be provided. A further coupling device is then provided for each support member, which coupling device forms an additional passive mechanical coupling either with respect to one of the preceding support members or with respect to the base plate and is moved along by the further coupling devices during a movement of the drive device.Further preferred and advantageous design features of the vehicle seat according to the invention are the subject matter of the dependent claims 2 to 9.In a preferred embodiment, it can be provided that the coupling device comprises a pivot lever, a coupling gear, a link guide and / or a rail guide. These mechanical couplings advantageously permit in a simple manner an additional passive mechanical drive coupling between the base plate, the first support carrier member and the at least one further support carrier member.In a further embodiment of the vehicle seat, the coupling device is arranged on the first support carrier member in a translation-fixed manner. A particularly reliable coupling of the relative movements of the elements of the support device can be achieved by a coupling device which is fixed in translation on the first support carrier member, wherein the first support carrier member advantageously serves as a support for the relative movements. The coupling device can be in particular a pivot lever with a slotted guide.In a preferred embodiment of the invention, a pretensioning device brings about a pretensioning of the coupling device between the rest position and the at least one usable position. This advantageously achieves a particularly advantageous coupling between the coupling device and the base plate and / or the first support member. In this case, the prestress of the coupling device can be effected in particular relative to the base plate or relative to the first support carrier member. Alternatively or additionally, a coupling gear with a transmission ratio arranged on the support device can cause a relative movement between the first support carrier member and the at least one further support carrier member in order to enable the passive movement.A special embodiment of the invention includes that the prestressing device comprises at least one spring which is supported on the one hand on a spring receptacle arranged on the base plate or on the first support carrier member and which is supported on the other hand on the coupling device. This can be, in particular, a tension, compression, arc or spiral spring. A spring can easily achieve a prestress between the base plate and the first support member.In an improved embodiment of the invention, an abutment is formed on the base plate, against which abutment the coupling device is prestressed. By providing the abutment on the base plate, a stable support device is provided overall, which is advantageously always biased into sliding contact during the movement. The abutment may be a pin protruding from the base plate. The abutment may have a sliding surface to reduce friction between the abutment and the coupling device when the coupling device slides along the abutment. It can furthermore be provided that the pivot lever also has a sliding surface which is formed in particular on the first lever arm and slides along the abutment. By a geometric configuration of the abutment and the sliding surface of the lever arm, the rotation of the pivot lever and thus the longitudinal movement of the further support carrier member can be determined in a simple manner when the vehicle seat is designed.In a particularly preferred embodiment of the invention, the drive device comprises an electric motor and / or a manual drive. In particular, an adjustment can be achieved comfortably by an electric motor. A manual drive, for example a crank, can advantageously reduce the costs for the drive device. A combination with an electric motor and a manual drive advantageously reduces the reliability. The electric motor can preferably be fastened to the base plate and can displace the first support member with respect to the base plate.It can be provided particularly advantageously that the drive device is designed as a linear drive, in particular as a spindle drive. A linear drive, in particular a spindle drive, advantageously permits an accurate, continuously variable and low-vibration adjustment. In addition, it can be provided that the linear drive comprises and drives a spindle, wherein the spindle pushes the first support carrier member.Finally, in a preferred, specific embodiment of the invention, it can be provided that the coupling device is a pivot lever pivotably fastened to the first support carrier member, wherein a first lever arm interacts with the base plate and a further lever arm interacts with the further support carrier member.A further aspect of the invention relates to a vehicle having at least one of the vehicle seats described above, wherein the seat frame of the vehicle seat is fixedly connected to a vehicle body of the vehicle, in particular fastened to a vehicle floor.It can be provided that the drive device is simultaneously supported on the seat frame or a further drive device is provided on the seat frame or the support device in order to achieve an adjustment of the support device relative to the seat frame or the seat surface. A seat back may be pivotally connected to the seat frame.Preferred exemplary embodiments of the invention with additional design details and further advantages are described and explained in more detail below with reference to the attached drawing.It shows: FIG. 1 shows an exemplary embodiment of a vehicle according to the invention. FIG. 2 shows a first exemplary embodiment of a vehicle seat according to the invention FIG. 3 shows a second exemplary embodiment of a vehicle seat according to the inventionDESCRIPTION OF PREFERRED EMBODIMENTSFIG. 1 shows a schematic side view of a vehicle 1 according to the invention with a vehicle seat 2 which is arranged in an interior of the vehicle 1. The direction of travel X and the vertical direction Z are shown here. The vehicle seat 2 has a seat frame 3 on which a seat surface 4 and a seat back 5 of adjustable inclination are arranged. Arranged on the seat frame 3 below the seat surface 4 is a fold-out support device 6, which can be moved from a rest position R (shown in dashed lines) into at least one first usable position N 1.The support device 6 is described in more detail on the basis of the representations of two exemplary embodiments of two vehicle seats according to the invention in FIGS. 2 and 3. The support device 6 comprises a base plate 10, a first support carrier member 22 and a further, second support carrier member 24, wherein the two support carrier members 22 and 24 are arranged so as to be movable relative to the base plate 10 in the longitudinal direction L of the support device 6 and the base plate 10 is fastened to the seat frame 3 so as to be pivotable about an axis y running in the transverse direction Y by a pivot angle α 1. The seat frame 3 is fixed on a vehicle floor 7. A pivot drive, which pivots the support device by the pivot angle α and relative to the seat frame 3, is not shown because of the better overview. Such a pivot drive can be fastened, for example, to the seat frame 3 and pivot the support device via a gear. The two support beams 22, 24 may each include a pad provided under a cover. It can also be provided that all support carrier members 22, 24 share a cushion which is pulled apart or pressed together during a movement. A cover can be provided over the cushion or the cushions, which cover can extend in particular as far as beyond the seat surface 4. Instead of a cushion, a support made of a plastic, in particular soft, can be arranged on the support carriers integrally or as an additional component. Furthermore, not shown are rails which preferably enable a low-friction displacement of the base plate 10, the first support carrier member 22 and the second support carrier member 24 relative to one another.In FIGS. 2 and 3, the vehicle seat 2 is shown in each case from below. Both exemplary embodiments have in common that a drive device 30 is provided on the base plate 10 and a coupling device 40 coupling the base plate 10, the first and the further support carrier member 22, 24, wherein the respective drive device 30 brings about the movement between the rest position R and the at least one usable position N 1. Further usable positions, not shown, can be provided between the rest position R and the usable position N in 1 and can be adjusted, for example, by means of corresponding catches or other holding means. Furthermore, in both exemplary embodiments, a prestressing device 60 is provided. The rest position R and the first use position N 1 are respectively drawn in for the first support carrier member 22 and the second support carrier member 24, wherein it can be seen that a running distance S 1 between the positions R and N 1 on the second support carrier member 24 is longer than a running distance S 2 between the positions R and N 1 on the first support carrier member 22, According to the invention, in addition to the propulsion of the first support carrier 22 along which the second support carrier 24 slides, the further, second support carrier member 24 is moved by the mechanical coupling device 40 in the longitudinal direction L of the support device 6, so that the running distance of the second support member 24 is greater than the base plate 10.In both exemplary embodiments, the drive device 30 is designed as a mechanical feed drive. In the first exemplary embodiment according to FIG. 2, it is designed as a spindle drive and has a spindle 32 which can be extended against the base plate 10 and which, in the first exemplary embodiment, is driven by an electric motor 31. In FIG. 2, the spindle 32 is arranged rotatably mounted on the first support carrier member 22 and can push on or pull in the first support carrier member 22. The drive device 30 is formed in the second exemplary embodiment according to FIG. 3 as a rack and pinion forward drive consisting of a worm 32' and a row of teeth 33, and is driven in the second exemplary embodiment by a manual drive, which is formed here as a crank drive 34. The worm 32' engages in the row of teeth 33, which can also be designed as a toothed rack, and thus ensures a continuously variable advancement of the first support member 22 relative to the base plate 10.Furthermore, in both exemplary embodiments, the coupling device 40 has a pivot lever 41 which is fastened in a translation-resistant manner to a pivot joint 44 on the first support carrier member 22, is prestressed with a first lever arm 41 against the base plate 10 and engages by means of a guide pin 45 into an elongate hole 25 in the second support carrier 24 and thus forms a slotted guide for the coupling device 40.The pivot lever 41 is prestressed by a prestressing device 60. The pretensioning device 60 has a spring 61 in each case, which is supported on one side on a spring fastening 48 of a contact region 46 of the first lever arm 42. On the other hand, the spring 61 is supported on a spring receptacle 62. In the exemplary embodiment according to FIG. 2, the spring 61 is formed by a compression spring, wherein the spring receptacle 62 is arranged on the base plate 10. In the exemplary embodiment according to FIG. 3, the spring 61 is formed by a helical spring, wherein the spring receptacle 62 is arranged on the first support carrier member 22. In both cases, the spring 61 biases the first lever arm 42 with a sliding contact surface 47 disposed on the first lever arm 42 against an abutment 63 which protrudes from a surface of the base plate 10. The abutment 63 and the sliding contact surface 47 serve as a positive guide for the pivot lever 41. in the present exemplary embodiments, the abutment 63 protrudes perpendicularly from the side of the base plate 10 facing the support members 22, 24.If the first support member 22 is moved relative to the base plate 10 by the drive device 30, the pivot lever 41 is moved along at the axis of rotation 45 and also the second support member 24. In this case, the first lever arm 42 slides past the abutment 63 with the sliding contact surface 47 on account of the prestress from the prestressing device 60, as a result of which the pivot lever 41 rotates in a rotational direction r about an axis of the rotary joint 44 and the second support member 24 is additionally moved with respect to the first support member 22 via the link guide comprising the slot 25 and the guide pin 45. The sliding contact surface 47 forms a projection on the first lever arm 42 which determines the rotational movement r of the pivot lever 41. By varying the sliding contact surface 47, the travel distance can advantageously be determined in a simple manner during the design. This results in the above-described greater travel distance of the second support member 24 between the rest position R and the at least one, in the present exemplary embodiment first usable position N 1.If the drive device 30 is retracted again, the components move in the longitudinal direction of the support device 6 in the opposite direction.The invention is not limited to the above embodiment, which serves merely to explain the core idea of the invention in general. Rather, within the scope of the invention, the device according to the invention can also assume embodiments other than those described above. The device can in particular have features which represent a combination of the respective individual features of the claims.Reference numerals in the claims, the description and the drawings are used merely for better understanding of the invention and are not intended to limit the scope of protection.List of reference characters1 Vehicle 2 Vehicle seat 3 Seat frame 4 Seat surface 5 Seat back 6 Support device 7 Vehicle floor 10 Base plate 20 Support carrier 22 First support carrier member 24 Further support carrier member 25 Elongated hole 30 Drive device (linear drive) 31 Motor 32 Spindle 32' Worm 33 Row of teeth, rack 34 Manual drive, crank drive 40 Coupling device 41 Pivot lever 42 First lever arm 43 Further lever arm 44 Pivot joint 45 Guide pin 46 Contact region 47 Sliding contact surface 48 Spring mount 60 Pretensioning device 61 Spring 62 Spring holder 63 Abutment X Direction of travel Y Vehicle transverse direction Z Vehicle vertical direction L Longitudinal direction (of the support device) S Pivot angle R Rest position N 1 Useful position α Pivot angle r Direction of rotation y 1 Axis running in the vehicle transverse direction

Claims

Vehicle seat (2) for a vehicle (1), comprising a seat frame (3), a seat surface (4) arranged on the seat frame (3), and a support device (6) which can be moved between a rest position (R) and at least one first use position (N 1) having a base plate (10), a support carrier (20) which can be extended relative to the base plate (10), and a drive device (30) which can move the support carrier (20) with respect to the base plate (10), characterized in that the support carrier (20) comprises a first support carrier member (22) and at least one further support carrier member (24), in that the first support carrier member (22) can be moved by the drive device (30) between the rest position (R) and the at least one use position (N 1) with respect to the base plate (10), and in that the further support carrier member (24) is movable by a mechanical coupling device (40) between the rest position (R) and the at least one usable position (N 1) relative to the base plate (10) and relative to the first support carrier member (22).Vehicle seat according to Claim 1, characterized in that the coupling device (40) comprises a pivot lever (41), a coupling gear, a link guide and / or a rail guide.Vehicle seat according to one of the preceding claims, characterized in that the coupling device (40) is arranged on the first support member (22) in a translation-fixed manner.Vehicle seat according to one of the preceding claims, characterized in that a prestressing device (60) produces prestressing of the coupling device (40) in the direction of the rest position (R) or in the direction of the at least one usable position (N 1).Vehicle seat according to Claim 4, characterized in that the prestressing device (60) comprises at least one spring (61) which is supported on the one hand on a spring receptacle (62) arranged on the base plate (10) or on the first support member (22) and which is supported on the other hand on the coupling device (40).Vehicle seat according to Claim 4 or 5, characterized in that an abutment (63) is formed on the base plate (10), against which abutment the coupling device (40) is prestressed.Vehicle seat according to one of the preceding claims, characterized in that the coupling device (40) can push the further support carrier member (24) via a link guide, in particular via a guide pin (44) which engages in an elongate hole (25) in the further support carrier member (24).Vehicle seat according to one of the preceding claims, characterized in that the drive device (30) has an electric motor (31) and / or a manual drive (34).Vehicle seat according to one of the preceding claims, characterized in that the drive device (30) is designed as a linear drive, in particular as a mechanical feed drive, particularly preferably as a spindle drive or rack and pinion screw drive.Vehicle seat according to one of the preceding claims, characterized in that the coupling device (40) has a pivot lever (41) which is pivotably fastened to the first support carrier member (22), wherein a first lever arm (42) interacts with the base plate (10) and a further lever arm (43) interacts with the further support carrier member (24).Vehicle having at least one vehicle seat according to one of the preceding claims, wherein the seat frame (3) of the vehicle seat (2) is connected fixedly or movably, directly or indirectly to a vehicle body of the vehicle (1), in particular to a vehicle floor (7).

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