vehicle seat

Abstract

The invention relates to a vehicle seat, in particular for a commercial vehicle, comprising a seat part and a backrest, which includes a backrest lower part and a backrest upper part, wherein the backrest upper part comprises a frame part which in a basic state has a first extension along the lateral axis, wherein the frame part comprises a first frame element which is fixedly arranged relative to the backrest lower part and at least a second frame element which is displaceable along the lateral axis relative to the first frame element, wherein in a second state the first extension of the frame part along the lateral axis is reduced by displacing the second frame element relative to the first frame element.

Description

[0001] The invention relates to a vehicle seat, in particular for a commercial vehicle, comprising a seat part and a backrest, which includes a backrest lower part and a backrest upper part,

[0002] Such vehicle seats are suitable for commercial vehicles, agricultural vehicles such as tractors, construction machinery, or similar vehicles. Drivers of such vehicles often adopt a different seating position than the normal forward-facing position. This alternative seating position is oriented laterally and / or backwards and serves, for example, to better reach and operate controls located at the rear of the vehicle cab, or to better observe implements attached to the rear of the agricultural vehicle for extended periods. To enable or facilitate such an alternative seating position, vehicle seats are known in the prior art in which the entire upper part of the backrest is designed to be laterally movable.The occupant can thus slide the upper part of the backrest away during the swiveling motion, thereby gaining more space. The disadvantage is that such lateral movement of the upper part of the backrest requires a corresponding amount of space next to the vehicle seat. This additional space requirement can be particularly disadvantageous in cramped driver's cabs or other structural limitations.

[0003] The object of the invention is to provide a vehicle seat in which the aforementioned disadvantages are overcome or at least reduced.

[0004] The problem is solved by the subject matter of independent claim 1. Advantageous embodiments are described in the dependent claims.

[0005] The core concept of the invention is a vehicle seat, in particular for a commercial vehicle, comprising a seat part and a backrest, which includes a backrest lower part and a backrest upper part, wherein the backrest upper part comprises a frame part which in a basic state has a first extension along the lateral axis Y, wherein the frame part comprises a first frame element which is fixedly arranged relative to the backrest lower part and at least a second frame element which is displaceable along the lateral axis Y relative to the first frame element, wherein in a second state the first extension of the frame part along the lateral axis Y is reduced by displacing the second frame element relative to the first frame element.

[0006] The lower and upper parts of the backrest are designed and suitable for supporting an occupant. Advantageously, the lower and upper parts of the backrest together form the backrest.

[0007] The vehicle seat extends along a width axis (Y), a length axis (X), and a height axis (Z). In the aforementioned normal seating position, the occupant faces forward along the length axis (X). The backrest is located at or behind a rear end of the seat section along the length axis (X) and extends upwards from the seat section along the height axis (Z). Advantageously, the upper part of the backrest is positioned above the lower part along the height axis (Z).

[0008] In the following, the respective extensions of the frame section and the respective extensions of the upper backrest section are considered to be essentially the same. It should be clarified, however, that the extension of the upper backrest section is slightly greater than the extension of the frame section due to the cover and padding.

[0009] The first extension of the upper part of the backrest is therefore designed to ensure sufficient support for the occupants. Preferably, the first extension of the upper part of the backrest corresponds to the maximum width of the upper part of the backrest.

[0010] The lower backrest section is advantageously fixed to the first frame element. This can be achieved, for example, by a form-fit and / or a fabric-fit connection. The at least one second frame element is therefore advantageously displaceable relative to the lower backrest section and the first frame element. If the second frame element is displaced along the lateral axis (Y) towards the first frame element, the extension of the upper backrest section along the lateral axis (Y) decreases. After the displacement, the upper backrest section thus has a second extension along the lateral axis (Y), which is smaller than the first second extension along the lateral axis (Y). Advantageously, the upper backrest section is thus laterally compressed. This lateral compression provides the occupant with the necessary space for maintaining a seated position in which they face sideways or backwards.The occupant can shift the second frame element with their upper arm by rotating it accordingly, thus assuming a lateral or rearward-facing seating position. The lateral compression of the upper backrest section along the lateral axis (Y) therefore has a comparable effect to the lateral displacement of the upper backrest section in prior art designs, with the crucial difference that no additional space is required besides the vehicle seat.

[0011] In an advantageous embodiment, at least one pretensioning element provides a force between the first frame element and at least one second frame element, which causes a return to the initial state. The upper part of the backrest thus automatically returns to its initial state as soon as the occupant no longer exerts a force on it.

[0012] According to a further advantageous embodiment, the first frame element and the second frame element each have an upper section and a lower section. Preferably, the respective upper sections extend substantially parallel to the lower sections. Advantageously, the respective upper sections are connected to the respective lower sections by side sections. The frame element is thus advantageously a substantially closed contour that encloses an inner area.

[0013] Advantageously, the lower section of the first frame element is attached to the lower part of the backrest by means of a fastening element.

[0014] In a further advantageous embodiment, the frame part is covered with an at least partially elastic covering. The covering preferably lies against the frame part and thus encloses the inner area or a corresponding cavity.

[0015] The cover thus advantageously represents a so-called cavity covering. The at least partially elastic design of the cover ensures that sufficient padding is provided for the occupant in both the initial and subsequent states of the upper backrest. Preferably, the cover stretches during the transition from the second state to the initial state of the upper backrest.

[0016] According to a further preferred embodiment, the cover comprises at least one elastic outer layer. This outer layer could, for example, consist of a material comprising polyester and an elastomer. This outer layer is thus advantageously stretchable and can adapt to changes in the lateral extension of the upper part of the backrest. Preferably, the cover further comprises a padding layer. The padding layer is advantageously made of foam. Furthermore, it is preferred that the padding layer is arranged on the outer layer. Of course, further layers could also be provided between the padding layer and the outer layer and / or beneath the padding layer. Preferably, the padding layer consists of foam.

[0017] According to another preferred embodiment, the padding layer has predetermined creases. Advantageously, these predetermined creases run essentially along the vertical axis Z. It is advantageous that, during a transition from the initial state to the second state, the predetermined creases cause the cover to fold accordion-like. This guided folding results in less resistance from the cover during the transition from the initial state to the second state. The upper part of the backrest can thus be compressed with less force. In the initial state, the cover provides sufficient padding for the occupant. At the same time, in the compressed second state, the cover does not interfere with the occupant's comfort, as it is folded accordingly.

[0018] In a further preferred embodiment, the side sections are shaped like bows and project forward along a longitudinal axis (X). In particular, the side sections are curved such that they project forward along the longitudinal axis (X). It is advantageous that the bow-like design of the side sections creates a receiving space in which, in the second state of the upper backrest, the folded cover is at least partially arranged. During the transition from the initial state to the second state, sections of the cover advantageously fold backward into the receiving space due to the predetermined fold lines. The outer layer is advantageously elastic and thus stretches across the fold lines. Sufficient padding for the occupant therefore remains even in the compressed second state.

[0019] In a further preferred embodiment, one of the upper sections is at least partially slidably mounted within the other upper section. For example, the upper section of the first frame element can be slidably arranged within the upper section of the second frame element. Of course, the reverse arrangement is also conceivable. Alternatively or cumulatively, one of the lower sections is at least partially slidably mounted within the other lower section. For example, the lower section of the first frame element can be slidably arranged within the lower section of the second frame element. Of course, the reverse arrangement is also conceivable. Preferably, the upper sections and / or the lower sections are cylindrical or prismatic.

[0020] It is conceivable that the first frame element and / or the second frame element is made from at least one tube element. It is also conceivable that the first frame element and / or the second frame element consists of several bent tube elements which are joined together, for example, by means of a weld.

[0021] Advantageously, a first tube element has a smaller diameter than the second tube element, so that the first tube element can be arranged inside and moved within the second tube element. Such a design can be provided in the upper sections of the frame elements and / or the lower sections of the frame elements. When the upper part of the backrest is compressed, the first tube element is thus preferably pushed into the second tube element.

[0022] Advantageously, a stop is provided up to which the first frame element can be moved. Such a stop can be an element, for example a pin, a projection, or something similar. However, a stop can also result from the length of the first and / or second frame element.

[0023] In a further preferred embodiment, the first frame element and the second frame element are telescopically connected to one another. A telescopic connection comprises two or more coaxially nested cylindrical or prismatic tube elements. Each of the inner tube elements can be axially extended from the next larger one, which directly surrounds it. Each extension ends with a stop or locking mechanism at a specific position. Preferably, the upper sections and / or the lower sections of the frame elements are telescopically connected to one another. Accordingly, the upper sections and / or the lower sections of the frame elements are preferably designed as telescopes.

[0024] According to a further preferred embodiment, at least one rail element is arranged on the lower part of the backrest. Preferably, at least one sliding element is provided, which is arranged on the at least one second frame element and is guided and displaceable within the at least one rail element. When the at least one second frame element is displaced, the sliding element is displaced accordingly within the rail element. By providing the sliding element and the rail element, additional stability is provided with regard to forces acting on the second frame element along the vertical axis (Z) and / or with regard to shear forces acting on the second frame element.

[0025] According to a further preferred embodiment, the at least one preload element is designed as a spring element and / or as an elastomer. The spring element can, for example, be a coil spring, a torsion spring, or the like. A preload element as an elastomer can preferably be designed in any desired shape. Advantageously, the at least one preload element is arranged within one of the upper sections and / or one of the lower sections. It would also be conceivable for the at least one preload element to be arranged on one of the upper sections and / or one of the lower sections, in particular on an outer surface of one of the upper sections and / or one of the lower sections. By advantageously sliding the frame elements together as described above, the preload element is compressed accordingly.When the upper part of the backrest is compressed, the pre-tensioning element is advantageously compressed by the occupant or by the occupant's movement. When the occupant no longer exerts force on the upper part of the backrest, the compressed pre-tensioning element ensures that the upper part of the backrest returns from its second state to its initial state, i.e., the upper part of the backrest regains its original extent along the lateral axis (Y).

[0026] According to a further preferred embodiment, the at least one preload element is designed as a gas spring. Advantageously, one of the upper sections is at least partially designed as a gas spring, which is operatively connected to the other upper section. Alternatively or cumulatively, one of the lower sections is at least partially designed as a gas spring, which is operatively connected to the other lower section.

[0027] According to a further preferred embodiment, only one of the upper sections is at least partially designed as a gas spring. Preferably, the upper section of the first frame element is at least partially designed as a gas spring. Advantageously, the lower sections of the first and second frame elements are designed as strips or pins. The lower sections preferably abut each other along the vertical axis Z. Preferably, when the at least one second frame element is displaced relative to the first frame element, the lower section of the at least one second frame element is displaced along a lower or upper surface of the lower section of the first frame element.

[0028] It is conceivable that, during a transition from the ground state to the second state, the lower section of the second frame element is moved along a lower or upper surface of the lower section of the first frame element. Preferably, the lower section of the first frame element and / or the lower section of the at least one second frame element have guide elements. These guide elements are preferably designed and configured to guide the movement of the lower section of the at least one second frame element relative to the lower section of the first frame element. Such guide elements can be, for example, projections, pins, recesses, etc.

[0029] In a further preferred embodiment, only a second frame element is provided. Advantageously, the first frame element is fixed to the lower part of the backrest on the left side when the occupant is facing forward. The second frame element is thus preferably arranged to be displaceable on the right side when the occupant is facing forward. The upper part of the backrest therefore preferably has a fixed section on the left side, in the form of the first frame element. Advantageously, the upper part of the backrest is compressible on the right side. It has been observed that occupants / drivers usually turn to the right or to the right rear. Compression on the right side of the upper part of the backrest is therefore generally sufficient.Naturally, the invention should also include an embodiment in which only one first frame element is fixedly arranged on the lower part of the backrest on the right side and only one second frame element is provided on the left side in a movable manner.

[0030] In a further preferred embodiment, two second frame elements are provided. Preferably, only one first frame element is arranged between the second frame elements. Preferably, the first frame element is arranged centrally between the two frame elements. The first frame element is also preferably arranged centrally on the lower part of the backrest. This allows compression of the upper part of the backrest when rotating to the right as well as when rotating to the left. Preferably, the two second frame elements are symmetrically designed.

[0031] According to a further preferred embodiment, a locking device is provided which locks the at least one upper part of the backrest in the second state. The upper part of the backrest returns to its initial state after a release, for example, a release movement.

[0032] The present problem is further solved by a commercial vehicle, in particular an agricultural vehicle, with a vehicle seat according to the embodiments described above. The commercial vehicle can be equipped with all the features already described above in relation to the vehicle seat, either individually or in combination, and vice versa.

[0033] Further advantages, objectives, and features of the present invention are explained with reference to the accompanying figures below. Similar components may have the same reference numerals in the different embodiments.

[0034] The figures show: Fig. 1 a backrest; Fig. 2 a vehicle seat according to one embodiment; Fig. 3 a vehicle seat according to one embodiment; Fig. 4 a backrest upper part according to one embodiment; Fig. 5 a frame part according to one embodiment; Fig. 6 a section of a frame part; Fig. 7 a section of a reference; Fig. 8 a backrest top according to one embodiment; Fig. 9 a backrest top according to one embodiment; Fig. 10 a backrest upper part according to one embodiment; Fig. 11 a backrest upper part according to one embodiment; Fig. 12 a frame part according to one embodiment; Fig. 13 a frame part according to one embodiment.

[0035] In the Fig. 2 and Fig. Figure 3 shows a vehicle seat 1, in particular for a commercial vehicle. The vehicle seat 1 comprises a seat part 2 and a backrest 3, which comprises a backrest lower part 4 and a backrest upper part 5, wherein the backrest upper part 5 comprises a frame part 6, which in a basic state 7 has a first extension 8 along the lateral axis Y, wherein the frame part 6 comprises a first frame element 11, which is fixedly arranged relative to the backrest lower part 4 and at least a second frame element 12, which is displaceable along the lateral axis Y relative to the first frame element 11, wherein in a second state 9 the first extension 8 of the frame part 6 along the lateral axis Y is reduced by a displacement of the second frame element 12 to the first frame element 11.

[0036] The vehicle seat 1 extends along a vertical axis Z, a longitudinal axis X, and a lateral axis Y. The respective axes are perpendicular to each other. The longitudinal axis X extends along the (driving) direction in which the occupant is usually oriented forward, i.e., towards the controls such as the steering wheel, etc. The backrest 3 is located in a rearward area of ​​the seat section 2 along the longitudinal axis X or behind the seat section 2 along the longitudinal axis X. Furthermore, the backrest 3 extends upward from the seat section 2 along the vertical axis Z. For the sake of simplicity, it is assumed that the backrest 3 extends along the vertical axis Z. Of course, the backrest can be tiltable and thus inclined relative to the vertical axis Z. Accordingly, the vehicle seat 1 can include an adjustment mechanism for the tilt of the backrest 3. The vehicle seat can also include armrests. Fig. Figure 1 shows only the backrest 3 with 2 armrests.

[0037] The backrest 3 comprises a lower backrest part 4 and an upper backrest part 5. In Fig. Figure 1 shows the upper backrest section 5 in its basic state 7. Here, the upper backrest section 5 has a first extension 8, which is advantageously the maximum extension of the upper backrest section 5 along the width axis Y. In the Fig. 2 and Fig. Figure 3 shows the second state 9 of the upper backrest section 5. In this second state 9, the upper backrest section 5 is laterally compressed along the lateral axis Y. The upper backrest section 5 thus has a second extension 10, which is smaller than the first extension 8. The upper backrest section 5 can be compressed by an action of the occupant. This can be done, for example, by the occupant's upper arm during a rotation. The figures show an embodiment in which the fixed first frame element 11 is arranged on the left side when the occupant is facing forward along the longitudinal axis X. Of course, the invention also includes embodiments in which the fixed first frame element 11 is arranged on the left side when the occupant is facing forward along the longitudinal axis X.

[0038] In the Fig. 4, Fig. 5, Fig. 6, Fig. 8, Fig. 9 and Fig. Figure 10 shows a first embodiment. In the Fig. 11, Fig. 12 a second embodiment and in Fig. 13 a third embodiment. In this embodiment, the upper part of the backrest 5 is located in the Fig. 4 and Fig. 11 in the ground state 7. It is therefore not compressed. In the Fig. 8 and Fig. In position 9, the upper part of the backrest 5 is in its second state 9. It is therefore compressed. Fig. Figure 10 shows a superposition of the ground state 7 and the second state 9.

[0039] The vehicle seat 1 can include at least one preload element 13, which provides a force between the first frame element 11 and the at least one second frame element 12. This force causes a return from the second state 9 to the basic state 7. Thus, if the upper backrest section 5 is in the compressed second state 9, it automatically returns to the basic state 7 after release, i.e., when the occupant no longer exerts a force on the upper backrest section 5. The preload element 13 can be configured according to various embodiments, which will be discussed further below.

[0040] A locking device 19 may also be provided, which holds the upper part of the backrest 5 in the second state 9. The locking element device 19 is in Fig. 6 is only indicated. The movable, at least one second frame element 12 is locked relative to the fixed first frame element 11. Such a locking element device 19 can, for example, comprise a cam arrangement that provides a push-push function. In such an arrangement, the second frame element 12 is moved along the lateral axis Y towards the first frame element 11 with a first movement. This movement moves a locking element, for example, a pin or similar, in a cam to a locking section in the cam. This locking action keeps the second frame element 12 in its position, and the upper backrest section 5 remains in the second state 9. To release the locking action, a further force is required along the lateral axis Y.This additional force displaces the pin from the locking area of ​​the cam, and the second frame element 12 returns to its initial position due to the force of the pretensioning element 13, thereby returning the upper backrest section 5 to its basic state. Of course, other locking element devices 19 would also be conceivable.

[0041] The first frame element 11 and the second frame element 12 each have an upper section 11a, 12a and a lower section 11b, 12b. The respective upper sections 11a, 12a extend essentially parallel to the lower sections 11b, 12b. The respective upper sections 11a, 12a are connected to the respective lower sections 11b, 12b by side sections 14. The lower section 11b of the first frame element 11 is attached to the lower backrest section 4 by means of a fastening element 21.

[0042] In the first embodiment according to the Fig. 4, Fig. 5, Fig. 6, Fig. 8, Fig. 9 and Fig. The side sections 14 are shaped like bows and project forward along the longitudinal axis X. The respective upper section 11a, 12a transitions into a first arc section 14a of the side section 14. This first arc section 14a forms an angle α with the upper section 11a, 12a. Simultaneously, the first arc section 14a extends downwards along the vertical axis Z and transitions into a central section 14b. Advantageously, the central section 14b extends in a straight line along the vertical axis Z until it transitions into a second arc section 14c. The second arc section 14c then merges into the lower section 11b, 12b. Analogous to the first arc section 14a, the second arc section 14c forms an angle α with the lower section 11b, 12b. This configuration creates a three-dimensional recording space 16.

[0043] The frame part 6 is covered with an at least partially elastic cover 15. During a transition from the second state 9 of the backrest upper part 5 to the basic state 7 of the backrest upper part 5, this at least partially elastic cover 15 is stretched. The cover 15 comprises at least one elastic outer layer 15a and a padding layer 15b. This is shown in Fig. 7 clearly visible. The padding layer 15b consists of a foam. Of course, further layers can be provided. The padding layer 15b has predetermined folding points 15c, so that when transitioning from the basic state 7 to the second state 9, the predetermined folding points 15c cause the cover 15 to fold in an accordion-like fashion.

[0044] The cover 15 spans the frame part 6 and includes a front section 15d, which provides a contact surface for the occupant. The front section 15d is thus oriented towards the occupant. In the basic state 7, the contact surface of the front section 15d is essentially flat. The front section 15d spans the receiving space 19. The cover 15 extends further around the side sections 14, the upper sections 11a, 12a, and the lower sections 11b, 12b to the rear. As shown in the Fig. 4, Fig. 8, Fig. As can be seen in Figure 9, the cover 15 behind the frame part 6 is essentially crescent-shaped. Other design forms are of course conceivable. The cover 15 also includes a rear area 15e. In the front area 15d, and preferably also in the rear area, predetermined fold points 15c are provided in the padding layer. In the areas of the predetermined fold points 15c, the padding layer 15b folds in a controlled manner, causing it to fold accordion-like. The elastic outer layer 15a continues to cover the folds. In the compressed second state 9, the cover 15 has folds 20. According to the Fig. 8 and Fig. 9 shows the front area 15d and the rear area 15e folds 20 in the second state 9.

[0045] In the front area 15d, which faces the occupant, these folds 20 are incorporated into the receiving space 16. This ensures that folding the cover 15 does not cause any discomfort for the occupant. Even in the compressed second state 9, the occupant continues to have sufficient support and padding.

[0046] According to the first embodiment, Fig. 4, Fig. 5, Fig. 6, Fig. 8, Fig. 9, Fig. In the second frame element 12, the upper section 12a is at least partially displaceably mounted within the upper section 11a of the first frame element 11. The reverse is also conceivable. Furthermore, the lower section 12b of the second frame element 12 is at least partially displaceably mounted within the lower section 11b of the first frame element 11. The reverse is also conceivable. The upper sections 11a, 12a and the lower sections 11b, 12b are tubular in design. An embodiment in which the first frame element 11 and the second frame element 12 are telescopically connected is also conceivable. In this case, the first frame element 11 and / or the second frame element 12 would comprise telescoping telescopic tubes, allowing the upper part of the backrest 5 to be compressed along the lateral axis Y.

[0047] As already described, at least one pre-tensioning element 13 ensures that at least one second frame element 12 is moved from the second state 9 back to the initial state 7. The pre-tensioning element 13 can also be designed such that in the initial state 7 a force acts between the first frame element 12 and the second frame element 12. This force keeps the frame elements 11 and 12 spaced apart, so that the upper part of the backrest has the first extension 8.

[0048] Advantageously, stop elements are provided which prevent further displacement of the wide frame element 12 beyond the first extension 8. Such stop elements can be projections, pins, recesses, etc. The stop elements can be arranged on or in the first frame element 11 and / or on or in the second frame element 12. In the basic state 7, the force of the preload element 13 also ensures that sufficient tension is generated on the reference 15 above the frame element 6.

[0049] The at least one preload element 13 can be designed as a spring element and / or as an elastomer. As in Fig. As can be seen in Figure 6, the pre-tensioning element 13 can be arranged within the upper section 11a and / or the lower section 11b. Within these sections 11a and 11b, the upper section 12a and the lower section 12b of the second frame element 12 are respectively displaceably arranged. By displacing the respective sections of the second frame element 12 within the sections of the first frame element 11, the pre-tensioning element 13 is compressed and a corresponding force is generated. Of course, other arrangements are also conceivable, for example, outside of sections 11a, 11b, 12a, and 12b.

[0050] At least one rail element 17 is arranged on the lower backrest section 4. At least one sliding element 18 is guided in this rail element 17 and is arranged on at least one second frame element 12. When the second frame element 12 is displaced, the sliding element 18 is displaced accordingly within the rail element 17. The provision of the sliding element 18 and the rail element 17 provides additional stability with respect to forces acting on the second frame element 12 along the vertical axis Z and / or with respect to shear forces acting on the second frame element 12.

[0051] According to the embodiment according to the Fig. 11 and Fig. In section 12, at least one preload element 13 is designed as a gas spring 18. The upper section 11a of the first frame element 11 is at least partially designed as a gas spring 18. The gas spring 18 is operatively connected to the upper section 12a of the second frame element 12. Conversely, the upper section 12a of the second frame element 12 can also be designed as a gas spring 18 in an analogous manner. It is also conceivable that, alternatively or cumulatively, a lower section 11b, 12b, could be designed as a gas spring 18 in an analogous manner.

[0052] In the present embodiment, only the upper section 11a of the first frame element 11 is designed as a gas spring 18. Corresponding side sections 14 are also provided in this embodiment. The lower sections 11b and 12b are designed as strips. The lower section 12b of the second frame element 12 is arranged to slide on an upper surface of the lower section 11b of the first frame element 11. When the second frame element 12 is displaced, the lower section 12b slides on this surface of the lower section 11b. It would be conceivable to provide guide elements that guide the displacement of the lower section 12b relative to the lower section 11b. Such guide elements could be arranged on / at the lower section 12b or on / at the lower section 11b.

[0053] In the Fig. In the embodiments shown in Figures 1 to 12, only a first frame element 11 and a movable second frame element 12 are provided. As already described, the first frame element 11 is fixedly arranged on the left side, so that the occupant can move the second frame element 12 when turning to the right.

[0054] By reducing the extension of the upper backrest section 5 on one side, the occupant is given sufficient space to assume a sideways or rearward-facing seating position. Reducing the width Y thus has a similar effect to sliding the upper backrest section to the side. However, the vehicle seat does not require any additional space that must be available.

[0055] According to the embodiment Fig.In this embodiment, two movable second frame elements 12 and one fixed first frame element 11 are provided. The same features as in the embodiments described above apply here. In this embodiment, the first frame element 11 is arranged centrally on the lower backrest section 4. A second frame element 12 can be moved towards the first frame element 11 both when the backrest is rotated to the right and when it is rotated to the left. The first extension 8 along the lateral axis Y can thus be reduced on both sides.

[0056] The applicant reserves the right to claim all features disclosed in the application documents as essential to the invention, provided they are novel individually or in combination compared to the prior art. It is further noted that the individual figures also describe features which may be advantageous on their own. A person skilled in the art will immediately recognize that a particular feature described in a figure may be advantageous even without incorporating other features from that figure. Furthermore, a person skilled in the art will recognize that advantages may also arise from a combination of several features shown in individual or different figures. Reference symbol list 1 vehicle seat 2 Seat section 3 Backrest 4 Backrest base 5 Backrest top 6 frame parts 7 Basic state 8 first extension 9 second state 10 second extension 11 first frame element 11a upper section of the first frame element 11b lower section of the first frame element 12 second frame element 12a upper section of the second frame element 12b lower section of the second frame element 13 Preload element 14 page sections 14a first arc section 14b Middle range 14c second arc area 15 reference 15a elastic outer layer 15b Cushion layer 15c Control points 15d front area with mounting surface 15e rear area 16 Recording room 17 rail element 18 Gas spring 19 Locking device 20 folds 21 Fastening element X Longitudinal axis Y-axis latitude Z-axis height axis

Claims

[1] Vehicle seat (1), in particular for a commercial vehicle, comprising a seat part (2) and a backrest (3) which includes a backrest lower part (4) and a backrest upper part (5), characterized by , that the upper part of the backrest (5) comprises a frame part (6) which in a basic state (7) has a first extension (8) along the width axis (Y), wherein the frame part (6) comprises a first frame element (11) which is fixed relative to the lower part of the backrest (4) and at least a second frame element (12) which is displaceable along the width axis (Y) relative to the first frame element (11), wherein in a second state (9) the first extension (8) of the frame part (6) along the width axis (Y) is reduced by displacing the second frame element (12) to the first frame element (11). [2] Vehicle seat (1) according to claim 1, characterized by, that at least one prestressing element (13) provides a force between the first frame element (11) and the at least one second frame element (12) which causes a return to the ground state (7). [3] Vehicle seat (1) according to claim 1 or 2, characterized by , that the first frame element (11) and the second frame element (12) each have an upper section (11a, 12a) and a lower section (11b, 12b), wherein the respective upper sections (11a, 12a) extend substantially parallel to the lower sections (11b, 12b), wherein the respective upper sections (11a, 12a) are connected to the respective lower sections (11b, 12b) by side sections (14). [4] Vehicle seat (1) according to any one of the preceding claims, characterized by, that the frame part (6) is covered with an at least partially elastic cover (15), wherein the cover (15) is stretched during a transition from the second state (9) of the backrest top part (5) to the basic state (7) of the backrest top part (5). [5] Vehicle seat (1) according to claim 4, characterized by , that the cover (15) comprises at least one elastic outer layer (15a), wherein the cover (15) further comprises a padding layer (15b), wherein the padding layer (15b) consists of a foam, wherein the padding layer (15b) has predetermined folding points (15c), wherein, upon a transition from the basic state (7) to the second state (9), the predetermined folding points (15c) cause the cover (15) to fold accordion-like. [6] Vehicle seat (1) according to claims 4 to 5, characterized by, that the side sections (14) are shaped like bows and project forward along a longitudinal axis (X), whereby the bow-like design of the side sections (14) creates a receiving space (16) in which, in the second state (9) of the upper part of the backrest (5), the folded cover (15) is at least partially arranged. [7] Vehicle seat (1) according to claim 3, characterized by , that one of the upper sections (11a, 12a) is at least partially displaceable within the further upper section (12a, 11a) and / or one of the lower sections (11b, 12b) is at least partially displaceable within the further lower section (12b, 11b), wherein the upper sections (11a, 12a) and / or the lower sections (11b, 12b) are cylindrical or prismatic. [8] Vehicle seat (1) according to claim 1, characterized by, that the first frame element (11) and the second frame element (12) are connected to each other telescopically. [9] Vehicle seat (1) according to any one of the preceding claims, characterized by , that at least one rail element (17) is arranged on the lower part of the backrest (4), wherein at least one sliding element (18) is provided which is arranged on the at least one second frame element (12) and is guided and displaceable in the at least one rail element (17). [10] Vehicle seat (1) according to any one of claims 3 to 9, characterized by , that the at least one preload element (13) is designed as a spring element and / or as an elastomer, wherein the at least one preload element (13) is arranged within one of the upper sections (11a, 12a) and / or one of the lower sections (11b, 12b). [11] Vehicle seat (1) according to any one of claims 3 to 10, characterized by, that at least one preload element (13) is designed as a gas spring (18), wherein one of the upper sections (11a, 12a) is at least partially designed as a gas spring (18) which is operatively connected to the further of the upper sections (12a, 11a), and / or one of the lower sections (11b, 12b) is at least partially designed as a gas spring (18) which is operatively connected to the further of the lower sections (12b, 11b). [12] Vehicle seat (1) according to any of the preceding claims, characterized by , that only a second frame element (12) is provided. [13] Vehicle seat (1) according to any one of claims 1 to 11, characterized by , that two second frame elements (12) are provided, wherein the first frame element (11) is arranged between the second frame elements (12). [14] Vehicle seat (1) according to any of the preceding claims, characterized by, that a locking device (19) is provided which locks at least one backrest upper part in the second state. [15] Commercial vehicle, in particular agricultural commercial vehicle, with a vehicle seat according to the preceding claims.

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