Vehicle seat having a displaceable upper backrest part

Abstract

The invention relates to a vehicle seat having a seat part and a backrest part, which comprises a lower backrest part and an upper backrest part arranged adjacent thereto in the vertical direction of the vehicle seat, a displacement device being arranged with a first section, which is fixedly connected to the lower backrest part, and with a second section, which is fixedly connected to the upper backrest part, the second section being completely displaceable together with the upper backrest part relative to the lower backrest part by means of a displacement movement directed at least in part in the width direction of the vehicle seat, the first section being arranged completely below the upper backrest part in the vertical direction and forming a guideway for the displacement movement of the second section.

Claims

1. A vehicle seat, comprising: a seat part; a backrest part, the backrest part comprising: a lower backrest part; an upper backrest part arranged adjacent to the lower backrest part in a vertical direction of the vehicle seat; and a displacement device having a first section fixedly connected to the lower backrest part and a second section fixedly connected to the upper backrest part, wherein the second section and the upper backrest part are displaceable with respect to the lower backrest part by a displacement movement directed at least in part in a width direction of the vehicle seat, wherein the first section is arranged completely below the upper backrest part in the vertical direction and forms a guideway for the displacement movement of the second section, and wherein the guideway is configured by two guide elements that are arranged at a distance from one another in the vertical direction of the vehicle seat.

2. The vehicle seat according to claim 1, wherein at least one guide element of the two guide elements extends in the width direction of the vehicle seat.

3. The vehicle seat according to claim 1, wherein the displacement movement of the upper backrest part starting from a non-displaced home position of the upper backrest part can only be initiated in a single direction or in two directions.

4. The vehicle seat according to claim 1, wherein a frame portion of the lower backrest part has at least one side part that forms a stop element for the displacement movement of the upper backrest part.

5. The vehicle seat according to claim 1, wherein a frame portion of the lower backrest part has at least one side part, and wherein at least one guide element of the two guide elements is mounted on the at least one side part.

6. The vehicle seat according to claim 1, wherein a ratio between a total width of the lower backrest part and a total width of the upper backrest part has a value in a range of from 1 to 3.

7. The vehicle seat according to claim 1, wherein a ratio between a total width of the lower backrest part and a total width of the upper backrest part is equal to 2.

8. The vehicle seat according to claim 1, wherein the second section has a support portion that is rigidly connected to the upper backrest part and is connected to a sliding portion of the second section, and wherein the sliding portion is connected to the first section and is mounted to be moveable relative to the first section.

9. A vehicle seat, comprising: a seat part; a backrest part, the backrest part comprising: a lower backrest part; an upper backrest part arranged adjacent to the lower backrest part in a vertical direction of the vehicle seat; and a displacement device having a first section fixedly connected to the lower backrest part and a second section fixedly connected to the upper backrest part, wherein the second section and the upper backrest part are displaceable with respect to the lower backrest part by a displacement movement directed at least in part in a width direction of the vehicle seat, wherein the first section is arranged completely below the upper backrest part in the vertical direction and forms a guideway for the displacement movement of the second section, and wherein the guideway is arranged running in the width direction and in at least one of the vertical direction or the longitudinal direction of the vehicle seat.

10. The vehicle seat according to claim 9, wherein the displacement movement of the upper backrest part starting from a non-displaced home position of the upper backrest part can only be initiated in a single direction or in two directions.

11. The vehicle seat according to claim 9, wherein a frame portion of the lower backrest part has at least one side part that forms a stop element for the displacement movement of the upper backrest part.

12. The vehicle seat according to claim 9, wherein the guideway is formed by at least one guide element extending in the width direction of the vehicle seat.

13. The vehicle seat according to claim 9, wherein a frame portion of the lower backrest part has at least one side part, and wherein at least one guide element is mounted on the at least one side part.

14. The vehicle seat according to claim 9, wherein a ratio between a total width of the lower backrest part and a total width of the upper backrest part has a value in a range of from 1 to 3.

15. The vehicle seat according to claim 9, wherein a ratio between a total width of the lower backrest part and a total width of the upper backrest part is equal to 2.

16. The vehicle seat according to claim 9, wherein the second section has a support portion that is rigidly connected to the upper backrest part and is connected to a sliding portion of the second section, and wherein the sliding portion is connected to the first section and is mounted to be moveable relative to the first section.

17. The vehicle seat according to claim 9, wherein the guideway is formed by at least one guide element extending in the width direction of the vehicle seat.

18. A vehicle seat, comprising: a seat part; a backrest part, the backrest part comprising: a lower backrest part; an upper backrest part arranged adjacent to the lower backrest part in a vertical direction of the vehicle seat; and a displacement device having a first section fixedly connected to the lower backrest part and a second section fixedly connected to the upper backrest part, wherein the second section and the upper backrest part is displaceable with respect to the lower backrest part by a displacement movement directed at least in part in a width direction of the vehicle seat, wherein the first section is arranged completely below the upper backrest part in the vertical direction and forms a guideway for the displacement movement of the second section, wherein the second section has a support portion that is rigidly connected to the upper backrest part and is connected to a sliding portion of the second section, wherein the sliding portion is connected to the first section and is mounted to be moveable relative to the first section, and wherein the support portion is guidable in a recess arranged on an upper element of a frame portion of the lower backrest part during the displacement movement of the upper backrest part.

19. The vehicle seat according to claim 18, wherein the sliding portion is mounted relative to at least one guide element of the first section by at least one of sliding guide elements or roller guide elements.

20. The vehicle seat according to claim 18, wherein a lower region of the support portion is arranged adjacent to the sliding portion in the longitudinal direction of the vehicle seat.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further advantages, aims and properties of the present invention are described by way of the appended drawings and the following description, in which a vehicle seat is illustrated and described by way of example using differently configured guide devices.

(2) In the drawings:

(3) FIG. 1a is a first perspective view of a vehicle seat with an upper backrest part in a home position;

(4) FIG. 1b is a second perspective view of the vehicle seat according to FIG. 1a with the upper backrest part in a displaced position;

(5) FIG. 2 is a third perspective view of the backrest part;

(6) FIG. 3a is a fourth perspective view of the backrest part;

(7) FIG. 3b is a detail of FIG. 3a;

(8) FIG. 4 is an exploded view of the backrest part.

DETAILED DESCRIPTION

(9) It should be mentioned that only frame portions 311, 321 of the backrest part 3 can be seen in FIGS. 2 to 4, while in FIGS. 1a and 1b only upholstery portions 312, 322 of the backrest part 3 and an upholstery portion 21 of the seat part 2 can be seen.

(10) According to FIGS. 1a and 1b, a vehicle seat (1) is shown having a seat part (2) and having a backrest part (3), which comprises a lower backrest part (31) and an upper backrest part (32) arranged adjacent thereto in the vertical direction (1z) of the vehicle seat (1). Also shown are the longitudinal direction 1x and the width direction 1y of the vehicle seat 1, a distinction being made in the case of the latter between a width direction to the right 1ya and a width direction to the left 1yb (each from the perspective of a seat occupant).

(11) While the upper backrest part (32) is in a home position P0, that is to say in a non-displaced position, according to FIG. 1a the upper backrest part (32) can be seen in a displaced position P1 according to FIG. 1b. In the present case, this displaced position P1 is achieved by means of a pure translational movement of the upper backrest part (32) relative to the lower backrest part (31) to the left 1yb along the guideway 411′.

(12) It can be seen that according to FIG. 1a the lower backrest part 31 together with the upper backrest part 32 is centred in the width direction 1y, 1ya, 1yb of the vehicle seat 1 if the upper backrest part 32 is located in the home position P0. Moreover, according to FIG. 1b, the lower backrest part 32 in the width direction 1y, 1ya, 1yb of the vehicle seat 1 is still centred, even if the upper backrest part 32 is in the displaced position P1.

(13) According to FIGS. 2 to 4, the backrest part (3), which comprises the lower backrest part (31) and the upper backrest part (32) arranged adjacent thereto for this purpose in the vertical direction (1z) of the vehicle seat (1), is shown again in different views.

(14) In particular, FIGS. 3a, 3b and 4 show a displacement device (4) is arranged with a first section (41), which is fixedly connected to the lower backrest part (31), and with a second section (42), which is fixedly connected to the upper backrest part (32). The second section (42) can be completely displaced with respect to the lower backrest part (31) together with the upper backrest part (32) by means of a displacement movement that in the present case is directed exclusively in the width direction (1y) of the vehicle seat (1).

(15) It can be clearly seen that the first section (41) is arranged in the vertical direction (1z) completely below the upper backrest part (32) and forms a guideway (411) for the displacement movement of the second section (42).

(16) In the present case, a frame portion 321 of the upper backrest part 31 is configured in one piece.

(17) Furthermore, the upper backrest part 32 in the present case is the only element apart from the second part 42, which can be displaced by means of the aforementioned displacement device 4. In the present case, the upper backrest part 32 is configured without a direct connection to the seat part 2 (see FIGS. 1a and 1b). In the present case, the upper backrest part 32 is connected to the lower backrest part 31 only by means of the aforementioned displacement device 4, that is to say indirectly.

(18) The upper backrest part 32 thus has no direct connection to the lower backrest part 31 in the present case. In the present case, the frame portion 321 of the upper backrest part 32 is free of a direct connection to the frame portion 311 of the lower backrest part 31.

(19) According to FIGS. 1a and 1 b, the upholstery portion 322 of the upper backrest part 32 is arranged in contact with the upholstery portion 312 of the lower backrest part 31. Furthermore, the upholstery portion 312 of the lower backrest part 31 is arranged in contact with the upholstery portion 21 of the seat part 2.

(20) The lower backrest part 31 cannot be displaced with respect to the remainder of the vehicle seat 1, in particular with respect to the seat part 2, by means of the aforementioned displacement device 4. This applies to the frame portion 311 and to the upholstery portion 312 of the lower backrest part 31. The lower backrest part 31 can thus be configured to be stable and in some cases also more comfortable or else heavier, since its mass does not have to be moved. Nevertheless, the lower backrest part 31 is pivotally mounted relative to the seat part 2 by means of a further displacement device (illustrated here only schematically with reference to the axis A1 according to FIG. 2) in order to be able to change the degree of inclination of the lower backrest part 31 relative to the seat part 2.

(21) It is thus ensured that after a displacement movement of the upper backrest part 32 no elements of the vehicle seat 1 remain within the relevant field of vision. At least a part of the region 50 (see region 50 bordered here by dotted lines according to FIG. 1b) which is taken up by the upper backrest part 32 in the non-displaced state P0 of the upper backrest part 32 is thus free of the upper backrest part 32 in the displaced state P1 of the upper backrest part 32 and also free of other parts of the vehicle seat 1.

(22) While a vehicle seat is shown in accordance with FIGS. 1a and 1b, its displacement movement is configured to be purely translational (see guideway 411′); FIG. 4 in particular shows that the first part 41 and in particular the guide elements 412, 413 run in the seat width direction and are configured as curved when seen in the longitudinal direction of the seat. The second part 42 thus experiences a purely rotational movement about an axis A2 at a distance from the body (illustrated in FIG. 4) which does not intersect the second part 42.

(23) In the present case, the upper backrest part 32 just has the one degree of freedom compared to the lower backrest part 31 that relates to a displacement by means of the aforementioned displacement device 4. In the present case, the upper backrest part 32 is not pivotally mounted relative to the lower backrest part 31.

(24) It can be clearly seen that the first section 41 (see guide elements 412, 413) of the displacement device 4 is located completely below the upper backrest part 31. It is therefore not arranged so as to protrude upwards beyond an upper limit of the lower backrest part 31 in the vertical direction 1z of the vehicle seat 1, which limit is configured here by the upper element 3111 of the lower backrest part 31. In the present case, the first section 41 is arranged completely below the upper limit. The first section 41 is also mounted in the stable lower backrest part 31 and is itself configured as part of the frame portion 311 of the lower backrest part 31. In the present case, the two guide elements 412, 413 of the first section 41 are arranged as a connecting element between two side parts 3113, 3114 of the frame portion 311.

(25) It can also be seen that the guideway 411 (see FIG. 3a) is formed by means of the two guide elements 412, 413 extending in the width direction 1y of the vehicle seat 1. These guide elements 412, 413 are each configured as a tube and, by virtue of their outer shape (that is to say, for example, their outer diameter) and their course, especially in the direction of displacement, form the guideway 411 for the second section 42.

(26) The two guide elements 412, 413 are arranged at a distance from one another in the vertical direction 1z of the vehicle seat 1. In the present case, the second section 42 is also connected to both guide elements 412, 413 and is guided by means of them. In this case, the guideway 411 is defined in such a way that it follows a course of a line which is centred between the central axis 4121 of the first guide element 412 and the central axis 4131 of the second guide element 413 (see here the illustration according to FIG. 3a).

(27) In the present case, the guideway 411 according to FIG. 3a is arranged to run in the width direction 1y and in the longitudinal direction 1x of the vehicle seat 1. The guideway 411 thus forms a curve shape which is configured in two dimensions. In contrast, the guideway 411′ according to FIG. 1b is arranged to run only in the width direction 1y of the vehicle seat 1. The guideway 411′ thus forms a curve shape which is one-dimensional and thus corresponds to a straight line.

(28) In the present case, the second section 42 has a support portion 421 rigidly connected to the upper backrest part 32, which support portion is connected to a sliding portion 422 of the second section 42, the sliding portion 422 being connected to the first section 41 and being mounted so as to be movable relative thereto.

(29) It is also shown that the sliding portion 422 is mounted relative to the two guide elements 412, 413 of the first section 41 by means of sliding guide elements 4221, which in the present case are formed by slide bearing elements made of polyoxymethylene (POM).

(30) In the present case, the sliding portion 422 is mounted relative to the first guide element 412 by means of a single sliding guide element 4221 and with respect to the second guide element 413 by means of two sliding guide elements 4221.

(31) In addition, a lower region 4212 of the support portion 421 is arranged adjacent to the sliding portion 422 in the longitudinal direction of the seat 1x. The support portion 421 is rigidly connected to the sliding portion 422 in the present case. In the present case, the support portion 421 is connected to the sliding portion 422 by means of a first 423 and by means of a second screw connection 424.

(32) In the present case, the support portion 421 is arranged to extend in the vertical direction 1z of the vehicle seat 1. In addition, the support portion 421 extends upwards in the vertical direction 1z of the vehicle seat 1 beyond the upper limit of the lower backrest part 31 (see upper element 3111) and at the same time downwards beyond a lower limit 3211 of the upper backrest part 32. The support portion 421 is thus arranged in sections in the longitudinal direction 1x of the vehicle seat 1 adjacent to the upper backrest part 32 and the lower backrest part 32.

(33) In the present case, the support portion 421 is configured in the form of a sheet metal panel which has a plurality of folded edges. The planar surface of the non-bevelled lower region 4212 thus offers an ideal installation location for the sliding portion 422.

(34) It is also shown that the support portion 421 can be guided in a recess 3112 arranged on an upper element 3111 of a frame portion 311 of the lower backrest part 31 during the displacement movement of the upper backrest part 32. In the present case, this recess 3112 is configured parallel to the course of the guideway 411. When the support portion 421 is installed, it can be guided through the recess 3112 at least with its lower end and/or its lower region 4212, since the total thickness of the lower region 4212 is smaller than the recess 3112.

(35) It can also be seen that the frame portion 311 of the lower backrest part 31 in the longitudinal direction 1x of the vehicle seat 1 adjacent to the position of the sliding portion 422 and the lower region 4212 of the support portion 421 has a recess 3115 (see region between the two side parts 3113, 3114 in the width direction 1y), so that the location for the installation of the assembly comprising the sliding portion 422 and the support portion 421 on the guide elements 412, 413 is freely accessible.

(36) In the present case, the displacement movement of the upper backrest part 32 can be initiated in two directions 1ya, 1yb, namely to the right and to the left, starting from the non-displaced home position P0 of the upper backrest part 32 shown in FIG. 3a.

(37) In addition, the frame portion 311 of the lower backrest part 31 forms a stop element for the displacement movement of the upper backrest part 32 in each of the two directions 1ya, 1yb by means of the two side parts 3113, 3114.

(38) In addition, both guide elements 412, 413 are mounted by means of the two side parts 3113, 3114; in the present case, both guide elements 412, 413 are connected to the two side parts 3113, 3114 by means of a fixed clamping. The two side parts 3113, 3114 are arranged opposite one another in the width direction 1y of the vehicle seat 1.

(39) According to FIG. 4, the frame portion 311 of the lower backrest part 31 also has two cross struts 3117, 3121 in the form of deep-drawn sheet metal parts or plastics injection-moulded parts. In addition, a cover part 3116 is arranged, for example, in the form of a deep-drawn sheet metal panel or a plastics injection-moulded part which covers the guide elements 412, 413 and the adjustment mechanism of the displacement device 4 to the front and has the recess 3112. Furthermore, tension elements 3118, 3119, 3120 are arranged in the form of wire tension elements, which are arranged from top to bottom (see tension elements 3119, 3120) or from left to right (see tension element 3118) and make the seat more stable overall.

(40) In the present case, a ratio between a total width 313 of the lower backrest part 31 and a total width 323 of the upper backrest part 32 (see FIG. 2) has a value of 1.5.

(41) It will be appreciated that the embodiments described above are merely a first configuration of the vehicle seat according to the invention. The configuration of the invention is therefore not limited to these embodiments.

(42) All the features disclosed in the application documents are claimed as being essential to the invention provided that, individually or in combination, they are novel over the prior art.

LIST OF REFERENCE SIGNS

(43) 1 vehicle seat 1x longitudinal direction 1y width direction 1z vertical direction 2 seat part 3 backrest part 4 displacement device 21, 312, 322 upholstery portion 31 lower backrest part 32 upper backrest part 41 first section 42 second section 311, 321 frame portion 313, 323 total width 411, 411′ guideway 412, 413 guide element 421 support portion 422 sliding portion 423, 424 screw connection 3111 upper element 3112, 3115 recess 3113, 3114 side part 3116 cover part 3117, 3121 cross strut 3118, 3119, 3120 tension element 3211 lower limit 4121, 4131 central axis 4212 lower region 4221 sliding guide elements A1, A2 axis