Vehicle seat having a roller rail

Abstract

The invention relates to a vehicle seat comprising a seat part and a vehicle seat base having a frame part for supporting the seat part or for attachment to a vehicle body and having a height-adjustable scissor mechanism, the scissor mechanism having at least one first scissor arm, the frame part having at least one first rail element, and the frame part having at least one second rail element. Wherein at least one end of the first scissor arm is connected to the first rail element by means of a floating bearing, the floating bearing having a rolling element with a shaft and a sliding element which are arranged one after the other in the direction of the rolling axis, the rolling element rotating about the rolling axis of the shaft, and the sliding element rotating about the rolling axis of the shaft. Wherein the rolling element has at least one contact point with a rolling surface of the first track element, the sliding element has at least one contact point with a sliding surface of the first track element or a second track element of the frame part, and the rolling surface and the sliding surface are arranged in a range of 0 lt with each other; [alpha] [lt]; and the angle alpha is 90 degrees.

Description

Technical Field

[0001] The present invention relates to a vehicle seat, comprising a seat component and a vehicle seat base, the vehicle seat base having a frame component for supporting the seat component or for attaching to a vehicle body and a height-adjustable scissor mechanism, wherein the scissor mechanism has at least one first scissor arm, the frame component has at least one first rail element, wherein at least one end of the first scissor arm is connected to the first rail element by means of a first floating bearing, wherein the first floating bearing has a first rolling element with an axis and a first sliding element, the first rolling element and the first sliding element are arranged one after the other in the direction of the rolling axis, the first rolling element rotates around the rolling axis of the axis, the first rolling element has at least one first contact point with the first rolling surface of the first rail element, the first sliding element has at least one second contact point with the first sliding surface of the first rail element or the second rail element of the frame component, the first rolling surface and the first sliding surface are set at a first angle α with each other in the range of 0<α<90°. Background Art

[0002] In motor vehicles, particularly commercial vehicles like tractors and trucks, seats are designed for maximum comfort due to their heavy use. Compared to passenger car seats, these seats have suspension in the vehicle seat base, in addition to the vehicle's suspension. A scissor mechanism supporting the seat components enables spring movement or general height adjustability. To connect the seat components and the scissor mechanism, a frame is positioned between them. The scissor mechanism allows for a scissor movement, meaning the two scissor arms can move apart or toward each other. To achieve this, at least one scissor arm must be connected to the frame via a floating bearing. This floating bearing typically consists of a roller guided in a rail element of the frame. Component and assembly tolerances must always be taken into account during the manufacturing or assembly of the components. This can, on the one hand, affect the roller guidance and, therefore, the maneuverability of the scissor mechanism, due to excessive play, and on the other hand, increase wear due to the play.

[0003] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a vehicle seat which remedies the disadvantages of the prior art and eliminates the play of the floating bearing by means of a combination of rollers and sliders. Summary of the Invention

[0004] According to the invention, this problem is solved by the object of the invention of a vehicle seat with roller guides. Advantageous embodiments and further embodiments of the invention are the subject matter of the detailed description.

[0005] The aforementioned problem is solved by a vehicle seat comprising a seat part and a vehicle seat base, the vehicle seat base having a frame part for supporting the seat part or for attachment to a vehicle body and a height-adjustable scissor mechanism, wherein the scissor mechanism has at least one first scissor arm, and the frame part has at least one first rail element, wherein at least one end of the first scissor arm is connected to the first rail element by means of a first floating bearing. The first floating bearing has a first rolling element with a shaft and a first sliding element, the first rolling element and the first sliding element being arranged one behind the other in the direction of the rolling axis, wherein the first rolling element rotates about the rolling axis of the shaft. The first rolling element has at least one second contact point with a first rolling surface of the first rail element, and the first sliding element has at least one first contact point with a first sliding surface of the first rail element or the second rail element of the frame part, wherein the rolling surface and the sliding surface are arranged at an angle α relative to each other in the range of 0<α<90°.

[0006] The first rolling surface is spanned by a surface formed by all contact points between the first rolling element and the first track element. Thus, when the first rolling element moves along the first track element, the portion of the first rolling element extending along it forms a surface spanning the first rolling surface. Preferably, the first rolling surface is flat, i.e. not curved. The same is true for the first sliding surface. The first sliding surface is spanned by a surface formed by all contact points between the first sliding element and the first track element. Preferably, the first sliding surface is also flat, i.e. not curved. Preferably, the first track element has a flat portion along which the first sliding element and the first rolling element move. Preferably, the first rolling surface and the first sliding surface extend parallel in one direction, for example both extend parallel to the longitudinal direction X or the width direction Y. According to the invention, the two surfaces are not parallel, but include a first angle α>0. Furthermore, the surfaces are not perpendicular to each other and therefore include a first angle α<90°. The first angle α also corresponds to an acute angle between the normals of the first rolling surface and the first sliding surface.

[0007] According to a particularly preferred embodiment, the first rail element and / or the second rail element extend along the longitudinal direction X or the width direction Y of the vehicle seat, wherein the first rail element and / or the second rail element are each designed to guide a first rolling element and / or a first sliding element, wherein the first rolling surface forms the first surface of the first rail element and the first sliding surface forms the second surface of the first rail element or the second rail element.

[0008] According to a particularly preferred embodiment, the first rolling surface and the first sliding surface extend in the longitudinal direction X and / or the width direction Y of the vehicle seat.

[0009] Preferably, the first rolling surface is perpendicular to the height direction Z of the vehicle seat, so that the seat and / or the user can optimally transmit forces to the scissor mechanism and thus also to the vehicle body. Preferably, the first rolling surface and the first sliding surface are aligned with the main extension of the first rail element and / or the second rail element, i.e., they extend parallel thereto.

[0010] According to a particularly preferred embodiment, the first angle is in the range of 45°<α<60°.

[0011] Depending on the angle between the first sliding surface and the rolling axis, the force exerted on the first sliding element by the first sliding surface acts more along the rolling axis or more perpendicular to the rolling axis. Preferably, the shaft having the rolling axis and the first rolling surface extend parallel to the width direction Y of the vehicle seat, and the first sliding surface and the first rolling surface extend parallel to the longitudinal direction X of the vehicle seat. If the first sliding surface and the first rolling surface are arranged at a first angle α relative to each other, then the first sliding surface and the rolling axis are also arranged at the first angle α relative to each other. If the first angle α is less than 45°, this means that the first sliding surface is aligned with the width direction Y rather than the height direction Z. The force exerted on the first sliding element by the first sliding surface acts more in the height direction Z than in the width direction Y. If the first angle α is greater than 45°, this means that the first sliding surface is aligned more closely with the height direction Z than with the width direction Y. The force exerted on the first sliding element by the first sliding surface acts more in the width direction Y than in the height direction Z. Preferably, α>45° is maintained. Preferably, the first sliding element is pressed against the shaft by the first sliding surface.

[0012] According to a particularly preferred embodiment, the first rolling element and the first sliding element are mounted on the end face of the shaft, wherein the first rolling element has a first cylindrical recess and the first sliding element has a second cylindrical recess, the shaft passes through the recess of the first rolling element and passes through or enters the recess of the first sliding element, wherein the first sliding element forms a semi-positive fit for the first rolling element.

[0013] According to a particularly preferred embodiment, the shaft has a first diameter for mounting the first sliding element, wherein the diameter of the second cylindrical recess is smaller than the first diameter, so that the fit between the shaft and the first sliding element is an interference fit.

[0014] Preferably, the first rolling element is a roller, and the first sliding element is a slider. The shaft preferably has a cylindrical shape with a receiving area at one end, into which the first rolling element and the first sliding element are mounted. Preferably, the shaft has a stop formed toward its center, thereby forming a semi-rigid fit for the first rolling element. This prevents the first rolling element from sliding toward the center of the shaft. The first rolling element is preferably pushed onto the shaft. The fit between the first rolling element and the shaft is preferably a clearance fit or a transition fit, allowing a certain amount of movement for the first rolling element, i.e., play along the rolling axis. To prevent the first rolling element from sliding off the shaft, the first sliding element preferably forms a second stop for the first rolling element. The first sliding element can be pressed against the shaft to secure it. To this end, the front end of the first sliding element can have a cylindrical recess that is smaller than the diameter of the shaft. This creates a frictional connection between the first sliding element and the shaft when the shaft is inserted into the recess of the first sliding element. As a result, no additional fixing devices, such as screws, clamps, adhesives, etc., are required to secure the first rolling element and / or the first sliding element to the shaft.

[0015] According to a particularly preferred embodiment, the first sliding element is rotationally symmetrical, wherein the rotation axis of the first sliding element and the rotation axis of the second cylindrical recess correspond to the rolling axis.

[0016] Preferably, the interference fit allows the first sliding element to rotate about the rolling axis. The rotationally symmetrical first sliding element can now rotate about the rolling axis while maintaining contact with the first sliding surface. This means that the point of contact between the first sliding element and the first sliding surface can be varied, which prevents wear on one side of the first sliding element. Preferably, the first sliding element is at least partially conical. Preferably, the angle between the radius of the cone's base region and the cone's adjacent generatrix corresponds to α. According to a preferred embodiment, the cone's shell and generatrix are convexly curved.

[0017] According to a particularly preferred embodiment, when viewed in the height direction of the vehicle seat, the contact point of the first sliding element is below the rolling axis and the contact point of the first rolling element is above the rolling axis, or the contact point of the first rolling element is below the rolling axis and the contact point of the first sliding element is above the rolling axis.

[0018] Since the first sliding surface is not perpendicular to the first rolling surface, the first sliding surface always exerts a force on the first sliding element and thus on the shaft in the height direction Z. If the contact points of the first sliding element and the first rolling element are located on different sides of the rolling axis, any play of the shaft in the height direction Z can be limited in one direction by the contact between the first rolling element and the first rolling surface and in the other direction by the contact between the first sliding element and the first sliding surface. Preferably, the height play of the shaft relative to the first track element is eliminated by the contact points with the first sliding surface and with the first rolling surface.

[0019] According to a particularly preferred embodiment, the first rail element has a central web, an upper web and a lower web, wherein the central web is located between the upper web and the lower web, the first rail element being U-shaped in a section perpendicular to its main extension axis.

[0020] According to a particularly preferred embodiment, the first rolling element and the first sliding element are at least partially surrounded by a U-shaped first rail element. The first rolling surface is formed by the first surface of the upper or lower web, and the first sliding surface is formed by the second surface of the central web.

[0021] Due to its U-shape, the first track element preferably fully accommodates the first rolling element and the first sliding element. Preferably, the first track element's boundary faces the axis. This prevents the first rolling element and the first sliding element from sliding out of the U-shaped first track element. Preferably, the first surface is part of the first rolling surface, and the second surface is part of the first sliding surface.

[0022] According to a particularly preferred embodiment, the vehicle seat base includes a third rail element arranged parallel to the first rail element and / or a fourth rail element whose main extension axis is arranged parallel to the main extension axis of the second rail element. The first scissor arm is connected to the third rail element by means of a second floating bearing, wherein the second floating bearing includes a second rolling element with an axis and a second sliding element, the second rolling element and the second sliding element being arranged one behind the other in the direction of the rolling axis, the second rolling element having at least one third contact point with the second rolling surface of the third rail element, and the second sliding element having at least one fourth contact point with the second sliding surface of the third or fourth rail element. The second rolling surface and the second sliding surface are arranged at a second angle β relative to each other in the range 0<β<90°.

[0023] To eliminate play along the rolling axis in addition to play in the height direction Z, the shaft can have a second receiving area at its second end, which includes a second rolling element and a second sliding element. Preferably, the second rolling surface is parallel to the rolling surface, and the second sliding surface is arranged at a second angle β to the second rolling surface. A force can be applied from the second sliding surface to the second sliding element in a direction opposite to the force exerted by the sliding surface on the sliding element along the rolling axis, thereby acting on the shaft along the rolling axis. Thus, the sliding surface can limit movement of the shaft in the rolling direction.

[0024] According to a particularly preferred embodiment, the first rolling surface is equal to the second rolling surface, and the first angle α is equal to the second angle β.

[0025] The present invention also provides a vehicle seat comprising a seat component and a vehicle seat base, the vehicle seat base having an adjustment device for displacing the vehicle seat relative to a vehicle body in at least one of a longitudinal direction X, a width direction Y, or a height direction Z, and a frame component for supporting the seat component or fastening it to the vehicle body. The frame component has at least one first rail element, wherein the adjustment device is connected to the first rail element by means of at least one floating bearing, wherein the floating bearing has a first rolling element with a rolling axis and a first sliding element, the first rolling element and the first sliding element being arranged one behind the other in the direction of the rolling axis. The first rolling element has at least one second contact point with a first rolling surface of the first rail element, and the first sliding element has at least one first contact point with a first sliding surface of the first rail element or the second rail element of the frame component, wherein the first rolling surface and the first sliding surface are arranged at a first angle α relative to each other in the range of 0<α<90°. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Other objects, advantages and usefulness of the present invention can be found in the following description taken in conjunction with the accompanying drawings, which show:

[0027] Figure 1 is a vehicle seat according to the present invention;

[0028] Figure 2 A vehicle seat base according to the present invention;

[0029] Figure 3 It is the floating bearing of the upper frame component;

[0030] Figure 4 It is the main view of the upper frame component;

[0031] Figure 5a is an isometric view of the sliding element; and

[0032] Figure 5b is a cross-sectional view of the sliding element. DETAILED DESCRIPTION

[0033] Figure 1 The vehicle seat 1 according to the present invention is shown. The vehicle seat 1 extends in a longitudinal direction X, a width direction Y, and a height direction Z. The seat part 2 comprises a seat cushion 4, a backrest 5, a headrest 6, and two armrests 7. As is customary in vehicle seats, the seat cushion 4, the backrest 5, and the armrests 7 can be tilted about the width direction Y. A vehicle seat base 3, which supports the seat part 2, is arranged in the lower part. The seat part 2 can be displaced relative to the vehicle seat base 3 in the longitudinal direction X by means of an adjustment device 8. The lower end of the vehicle seat base 3 is bolted to the vehicle body.

[0034] Figure 2The vehicle seat base 3 according to the present invention is shown. The vehicle seat base 3 includes an upper frame member 9 and a lower frame member 10. The upper frame member 9 carries the adjustment device 8 and, therefore, the seat component, and the lower frame member 10 secures the vehicle seat base 3 to the vehicle body. The upper and lower frame members 9, 10 are rectangular and extend primarily in the longitudinal direction X. A scissor mechanism 11 is mounted between the upper and lower frame members 9, 10. The scissor mechanism 11 includes a first scissor arm 12 and a second scissor arm 13. The first and second scissor arms 12, 13 are rotatably connected to each other about a scissor mechanism pivot 14. The upper frame member 9 is connected to the upper end e of the first scissor arm 12 via a first floating bearing 15 and to the upper end of the second scissor arm 13 via a first fixed bearing 16. The first floating bearing 15 and the first fixed bearing 16 are arranged at the same height in the height direction Z, with the first floating bearing 15 located forward of the first fixed bearing 16 in the longitudinal direction X. Forces acting on the upper frame member 9 are transmitted to the scissor mechanism 11 via the first floating bearing 15 and the first fixed bearing 16. Similarly, the lower frame member 10 is connected to the lower end of the second scissor arm 13 via a second floating bearing 17 and to the lower end of the first scissor arm 12 via a second fixed bearing 18. The second floating bearing 17 and the second fixed bearing 18 are arranged at the same height in the height direction Z, with the second floating bearing 17 located in front of the second fixed bearing 18 in the longitudinal direction X. Force is transmitted from the scissor mechanism 11 to the lower frame member 10 and, thus, to the vehicle body, via the second floating bearing 17 and the second fixed bearing 18. An air spring (not shown) is connected to the first scissor arm 12 on one hand and to the lower frame member 10 on the other. The force with which the two scissor arms are pressed apart is predetermined by the spring rate of the air spring. Because the first and second scissor arms 12 and 13 are connected to each other via the scissor mechanism pivot 14, the distance between the first and second fixed bearings 16 and 18, or between the first and second floating bearings 15 and 17, increases when the distance between the first and second floating bearings 15 and 17 decreases. This allows the distance between the upper frame member 9 and the lower frame member 10 to change. In order to accommodate changes in the distance between the first floating bearing 15 , the first fixed bearing 16 and the second floating bearing 17 , the second fixed bearing 18 , the first floating bearing 15 , the second floating bearing 17 can be moved relative to the upper frame member 9 , the lower frame member 10 in the longitudinal direction X. The upper frame member 9 and the lower frame member 10 are designed to guide the first floating bearing 15 and the second floating bearing 17 .

[0035] Figure 3The first floating bearing 15 of the upper frame member 9 is shown. This frame member has a first rail element 19 that accommodates a shaft 20, which has rollers serving as first rolling elements 23 and sliders serving as first sliding elements 26. The shaft 20 forms part of the upper end of the first scissor arm 12 and extends parallel to the width direction Y. The shaft 20 has a cylindrical outer region 21 and an inner region 22. The first rolling element 23 slides onto the outer region 21. To this end, the inner diameter 24 of the first rolling element 23 is larger than the diameter of the outer region 21. To limit displacement of the first rolling element 23 in the direction parallel to the width direction Y, the shaft 20 has a first stop 25 for the first rolling element 23 at the transition from the inner region 22 to the outer region 21. Opposite the first stop 25, a first sliding element 26 is attached to the shaft 20. The inner diameter 27 of the first sliding element 26 is smaller than the diameter of the shaft 20 in the outer region 21. The first sliding element 26 is pressed against the shaft 20 and forms a second stop 28 for the first rolling element. The distance between the first stop 25 and the second stop 28 is greater than the width of the first rolling element 23, allowing clearance in the width direction Y. The outer region 21 of the shaft 20 is almost completely enclosed by the U-shaped first rail element 19. The first rail element has an upper web 29 that extends above the shaft 20 parallel to the width direction Y. This upper web then merges into a central web 30, which encloses the outer region 21 along the height direction Z. Finally, the central web 30 merges into a lower web 31 that extends parallel to the upper web 29. All of the upper webs 29, central web 30, and lower web 31 also extend in the longitudinal direction X. The central web 30 forms a lower portion 32, which is arranged at an angle α of 50° with respect to the width direction Y. The inner side of the lower portion 32, i.e., the side facing the shaft 20, forms a first sliding surface 33 for the first sliding element 26, which contacts the first sliding surface 33 at a first contact point 34. Likewise, the inner side of the upper web 29 forms a first rolling surface 35 for the first rolling element 23, which contacts the first rolling element 23 at a second contact point 36. The first contact point 34 of the first sliding element 26 is located below the shaft 20 or below the rolling axis, while the second contact point 36 of the first rolling element 23 is located above the shaft 20 or above the rolling axis.

[0036] Figure 4The upper frame component 9 is shown. The first scissor arm 12 is connected to the third rail element 38 via a third floating bearing 37. The third floating bearing 37 and the third rail element are constructed similarly to the first floating bearing 15 and the first rail element, corresponding to the mirror image of the first floating bearing 15 or the first rail element 19 on a mirror plane S, which extends parallel to the XZ direction. Therefore, the left end of the shaft 20 has a second rolling element 39 and a second sliding element 40. The second rolling element 39 has a third contact point 41 with a second rolling surface 43, and the second sliding element 40 has a fourth contact point 42 with a second sliding surface 44. The third contact point 41 and the fourth contact point 42 correspond to the first and second contact points between the third rail element 38 and the second rolling element 39 or the second sliding element 40. The first rail element 19 and the third rail element 38 are separated by a cross connection (not shown here). The distance between the first rail element 19 and the third rail element 38 is adjustable. If the distance between first rail element 19 and third rail element 38 increases uniformly along rolling axis R, central web 30 or first rail element 19 moves away from first sliding element 26, causing first sliding element 26 to lose its first contact point 34. The same is true for second sliding element 40; when third rail element 38 moves away from second sliding element 40, second sliding element 40 loses its fourth contact point 42. The distance between first sliding element 26 and second sliding element 40 cannot be changed because they are firmly pressed against shaft 20. By reducing the distance between first rail element 19 and third rail element 38, first sliding element 26 and second sliding element 40 once again contact first rail element 19 and third rail element 38. Since the first sliding surface 33 and the second sliding surface 44 are arranged at an angle α equal to 50° or β equal to 50° relative to the first rolling surface 35 and the second rolling surface 43, and therefore are also arranged at 50° relative to the rolling axis R, and since the first rolling surface 35 and the second rolling surface 43 extend parallel to the rolling axis R, the reduction in the distance between the first rail element 19 and the third rail element 38 causes the first contact point 34 and the fourth contact point 42 of the first sliding element 26 and the second sliding element 40 to move upward along the first sliding surface 33 and the second sliding surface 44 in the height direction Z. As a result, the shaft 20 is displaced upward relative to the first rail element 19 and the third rail element 38, causing the first rolling element 23 and the second rolling element 39 to move against the first rolling surface 35 and the second rolling surface 43.

[0037] In this way, the rail element forms a rigid fit between the shaft 20 and the first rolling element 23, the second rolling element 39, and the first sliding element 26, the second sliding element 40 in the width direction Y and the height direction Z. This eliminates the play of the first floating bearing 15 and the second floating bearing 37 in the width direction Y and the height direction Z.

[0038] Figure 5a and Figure 5b The sliding elements are shown. The first sliding element 26 is shaped like a double frustum of a cone. The frustum is rotationally symmetrical about the rolling axis R. The base area of ​​the outer frustum 45 lies on the base area of ​​the inner frustum 46, resulting in the two base areas having equal radii. The radius of the base corresponds to the height of the first sliding element 26, and the sum of the heights of the outer frustum 45 and the inner frustum 46 corresponds to the width of the first sliding element 26. The terms "outer" and "inner" also refer to the arrangement of the first sliding element on the shaft 20, so that the inner frustum 46 faces the first rolling element 23, while the outer frustum faces away from the first rolling element 23. The inner frustum 46 has a cylindrical recess, whose inner diameter 27 is smaller than the diameter of the outer region 21 of the shaft 20. The cylindrical recess is also arranged rotationally symmetrically about the rolling axis R. The height of the inner frustum 46 is greater than that of the outer frustum 45, and the height of the cylindrical recess is greater than half the width of the first sliding element 26. This ensures that the volume of the first sliding element 26 is proportionally larger on the shaft 20 than alongside it. Around the edge of the cylindrical recess, the inner top region 48 of the inner frustum has reinforcements 50 to protect the inner frustum 46 and prevent material fracture when the first sliding element 26 is pressed onto the shaft 20. Furthermore, three channels 51 are radially and evenly spaced about the rolling axis R within the cylindrical housing. The channels 51 have a semicircular base and extend the entire height of the cylindrical recess. When the first sliding element 26 is pressed onto the shaft, air trapped in the cylindrical recess can be expelled through these channels 51. The side surface of the outer frustum 45 is set at an angle α of 50° with the bottom surface, the same angle α as that between the first sliding surface and the second rolling surface. Furthermore, the side surface of the outer frustum is concavely curved toward the center of the first sliding element 26, with a radius r of 60 mm. On the one hand, the curvature makes it possible to compensate for manufacturing tolerances regarding the angle α and, on the other hand, ensures that the first sliding element 26 forms only one first contact point 34 rather than a contact surface, which reduces friction between the first sliding element 26 and the first rail element 19 .

[0039] The applicant reserves the right to claim all features disclosed in the application documents as essential to the invention, to the extent such features are novel compared to the prior art, either individually or in combination. Furthermore, each figure should depict potentially advantageous features. A person skilled in the art will readily recognize that a feature depicted in a figure may be advantageous without the use of other features in that figure. Furthermore, a person skilled in the art will also recognize that advantages may arise from a combination of features shown in a single figure or in different figures.

[0040] Reference Signs List 1 vehicle seat, 2 seat parts, 3 vehicle seat bases, 4 seat cushions, 5 backrest, 6 headrests, 7 armrests, 8. Adjustment device, 9 Upper frame parts, 10 Lower frame part, 11 scissor mechanism, 12 First scissor arm, 13 Second scissor arm, 14 Scissor mechanism pivot, 15 First floating bearing, 16 First fixed bearing, 17 Second floating bearing, 18 Second fixed bearing, 19 first track element, 20 axis, 21 external areas, 22 internal areas, 23 first rolling element, 24 Inner diameter of the first rolling element, 25 a first stop of the first rolling element, 26 first sliding element, 27 inner diameter of the first sliding element, 28 second stop of the first rolling element, 29 upper abdominal plate, 30 central web, 31 lower web, 32 lower part, 33 First sliding surface, 34 a first contact point of the first sliding element, 35 first rolling surface, 36 Second contact point of the first rolling element, 37 Third floating bearing, 38 third rail element, 39 second rolling element, 40 second sliding element, 41 The third contact point of the second rolling element, 42 a fourth contact point of the second sliding element, 43 Second rolling surface, 44 Second sliding surface, 45 The outer frustum of a cone, 46 Inner frustum of a cone, 48 inner top area, 50 reinforcement, 51 channels, X longitudinal direction, Y width direction, Z height direction, R rolling axis, S mirror, α first angle, β second angle, r radius, e The end of the first scissor arm.

Claims

1. A vehicle seat (1) comprising a seat part (2) and a vehicle seat base (3), the vehicle seat base (3) having a frame part (4) for supporting the seat part (2) or for attachment to a vehicle body and a height-adjustable scissor mechanism (11), wherein the scissor mechanism (11) has at least one first scissor arm (12), the frame part (4) having at least one first rail element (19), wherein at least one end (e) of the first scissor arm (12) is connected to the first rail element (19) by means of a first floating bearing (15), wherein the first floating bearing (15) has a shaft (20) A first rolling element (23) and a first sliding element (26), wherein the first rolling element (23) and the first sliding element (26) are arranged one behind the other in the direction of the rolling axis, and the first rolling element (23) rotates around the rolling axis (R) of the shaft (20), wherein the first rolling element (23) has at least one second contact point (36) with a first rolling surface (35) of the first rail element (19), and the first sliding element (26) has at least one first contact point (34) with a second rail element of the frame part (4) or a first sliding surface (33) of the first rail element (19), It is characterized by The first rolling surface (35) and the first sliding surface (33) form a first angle α with respect to each other in the range of 0<α<90°.

2. The vehicle seat according to claim 1, It is characterized by The first rail element (19) and / or the second rail element extend along the longitudinal direction (X) or the width direction (Y) of the vehicle seat (1), wherein the first rail element (19) and / or the second rail element are each designed to guide the first rolling element (23) and / or the first sliding element (26), wherein the first rolling surface (35) forms the first surface of the first rail element (19) and the first sliding surface (33) forms the second surface of the first rail element (19) or the second rail element.

3. The vehicle seat according to claim 1, It is characterized by The first rolling surface (35) and the first sliding surface (33) extend along the longitudinal direction (X) and / or the width direction (Y) of the vehicle seat (1).

4. The vehicle seat according to claim 1, It is characterized by The first angle α is in the range of 45°<α<60°.

5. The vehicle seat according to claim 1, It is characterized by The first rolling element (23) and the first sliding element (26) are mounted on the end face of the shaft (20), the first rolling element (23) having a first cylindrical recess, the first sliding element (26) having a second cylindrical recess, the shaft (20) passing through the first cylindrical recess of the first rolling element (23) and through or inserted into the second cylindrical recess of the first sliding element (26), the first sliding element (26) forming a semi-rigid fit for the first rolling element (23).

6. The vehicle seat according to claim 5, It is characterized by The shaft (20) has a first diameter for mounting the first sliding element (26), and the diameter of the second cylindrical recess is smaller than the first diameter, so that an interference fit is formed between the shaft (20) and the first sliding element (26).

7. The vehicle seat according to claim 5, It is characterized by The first sliding element (26) is rotationally symmetrical, wherein the rotation axis of the first sliding element (26) and the rotation axis of the second cylindrical recess correspond to the rolling axis (R).

8. The vehicle seat according to claim 1, It is characterized by Viewed from the height direction (Z) of the vehicle seat (1), the first contact point (34) of the first sliding element (26) is located below the rolling axis (R), and the second contact point (36) of the first rolling element (23) is located above the rolling axis (R), or the second contact point (36) of the first rolling element (23) is located below the rolling axis (R), and the first contact point (34) of the first sliding element (26) is located above the rolling axis (R).

9. The vehicle seat according to claim 1, It is characterized by The first rail element (19) has a central web (30), an upper web (29) and a lower web (31), wherein the central web (30) is arranged between the upper web (29) and the lower web (31), and the first rail element (19) is U-shaped in a cross section perpendicular to its main extension axis.

10. The vehicle seat according to any one of claims 2 and 9, It is characterized by The first rolling element (23) and the first sliding element (26) are at least partially surrounded by the U-shaped first track element (19), the first rolling surface (35) is formed by the first surface of the upper web (29) or the lower web (31), and the first sliding surface (33) is formed by the second surface of the central web (30).

11. The vehicle seat according to claim 1, It is characterized by The vehicle seat base (3) has a third rail element (38) arranged parallel to the first rail element (19) and / or has a fourth rail element, the fourth rail element being arranged with its main extension axis parallel to the main extension axis of the second rail element, the first scissor arm (12) being connected to the third rail element (38) by means of a second floating bearing (37), wherein the second floating bearing (37) has a second rolling element (39) with the shaft (20) and a second sliding element (40), the second rolling element (39) and the second sliding element (40) being arranged one after the other in the direction of the rolling axis (R), wherein the second rolling element (39) has at least one third contact point (41) with a second rolling surface (43) of the third rail element (38), and the second sliding element (40) has at least one fourth contact point (42) with a second sliding surface (44) of the third rail element (38) or the fourth rail element, The second rolling surface (43) and the second sliding surface (44) form a second angle β with respect to each other in the range of 0<β<90°.

12. The vehicle seat according to claim 11, It is characterized by The first rolling surface (35) is equal to the second rolling surface (43), and the first angle α is equal to the second angle β.

13. A vehicle seat (1) comprising a seat part (2) and a vehicle seat base (3), the vehicle seat base (3) having an adjustment device (8) for displacing the vehicle seat relative to a vehicle body in at least one of a longitudinal direction (X), a width direction (Y) or a height direction (Z), and a frame part (4) for supporting the seat part (2) or fixing the seat part (2) to the vehicle body, the frame part (4) having at least one first rail element (19), the adjustment device (8) being connected to the first rail element (19) by means of at least one floating bearing, The floating bearing comprises a first rolling element (23) and a first sliding element (26) with a rolling axis (R), wherein the first rolling element (23) and the first sliding element (26) are arranged one behind the other in the direction of the rolling axis (R), wherein the first rolling element (23) has at least one second contact point (36) with a first rolling surface (35) of the first rail element (19), and the first sliding element (26) has at least one first contact point (34) with a first sliding surface (33) of the first rail element (19) or a second rail element of the frame part (4), It is characterized by The first rolling surface (35) and the first sliding surface (33) form a first angle α with respect to each other in the range of 0<α<90°.

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