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Title:
SEAT, IN PARTICULAR AIRCRAFT SEAT
Document Type and Number:
WIPO Patent Application WO/2019/183497
Kind Code:
A1
Abstract:
The invention relates to a seat (1), in particular an aircraft seat, comprising: - a carrier structure (2) with at least a one backrest side carrier part structure (2.1) for a backrest (1.1) and a head side carrier part structure (2.4) for a head part (1.4), wherein an adjustment mechanism (10) is arranged between the head side carrier part structure (2.4) and the backrest side carrier part structure (2.1), the adjustment mechanism (10) coupling the backrest side carrier part structure (2.1) and the head side carrier part structure (2.4) in such a manner that the head part (1.4) necessarily adjusts into a horizontal plane with the backrest (1.1) when the backrest (1.1) is adjusted from a nearly vertical or inclined position (P1 to P3) of the backrest (1.1) into a horizontal position or bed position (P4) such that an essentially flat plane is formed.

Inventors:
REICHEL UWE (DE)
WEINGART ANDREAS (DE)
BURGEY DANIEL (DE)
Application Number:
PCT/US2019/023623
Publication Date:
September 26, 2019
Filing Date:
March 22, 2019
Export Citation:
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Assignee:
ADIENT AEROSPACE LLC (US)
International Classes:
B64D11/06; A47C1/031; A47C1/035; A47C1/036; A47C13/00
Domestic Patent References:
WO2000008976A12000-02-24
Foreign References:
US20080093502A12008-04-24
US20040232283A12004-11-25
US6059364A2000-05-09
US4040661A1977-08-09
US20140159436A12014-06-12
US20030080597A12003-05-01
US8579375B22013-11-12
US6170786B12001-01-09
US20150274301A12015-10-01
Attorney, Agent or Firm:
MCGLEW AND TUTTLE, P.C. (US)
Download PDF:
Claims:
Claims

1. A seat (1 ), in particular an aircraft seat, comprising:

- a carrier structure (2) with at least a one backrest side carrier part structure (2.1 ) for a backrest (1.1 ) and a head side carrier part structure (2.4) for a head part (1.4),

wherein an adjustment mechanism (10) is arranged between the head side carrier part structure (2.4) and the backrest side carrier part structure

(2.1 ), the adjustment mechanism (10) coupling the backrest side carrier part structure (2.1 ) and the head side carrier part structure (2.4) in such a manner that the head part (1.4) necessarily adjusts into a horizontal plane with the backrest (1.1 ) when the backrest (1.1 ) is adjusted from a nearly vertical or inclined position (P1 to P3) of the backrest (1.1 ) into a horizontal position or bed position (P4) such that an essentially flat plane is formed.

2. The seat (1 ) according to claim 1 , wherein the adjustment mechanism (10) kinematically couples the head side carrier part structure (2.4) and the backrest side carrier part structure (2.1 ) together.

3. The seat (1 ) according to claim 2, wherein the adjustment mechanism (10) is configured as a lever link (HG) arranged between the backrest carrier part structure (2.1 ) and the head carrier part structure (2.4). 4. The seat (1 ) according to claim 3, wherein the lever link (HG) comprises a first link arm (GA1 ) coupled with the backrest side carrier part structure

(2.1 ) and a second link arm (GA2) coupled with the head side carrier part structure (2.4), wherein the first link arm (GA1 ) and the second link arm (GA2) are pivotably coupled to each other by a link (G4) and wherein one of the link arms (GA2) necessarily deflects and adjusts the head part (1.4) into the horizontal plane with the backrest (1.1 ) because of a restricted guidance of the head side carrier part structure (2.4) in the guiding arrangement (F) when the backrest (1.1 ) is pivoted.

5. The seat (1 ) according to claim 4, wherein the guiding surface (12) is configured as a sliding guidance or motion guidance, in particular a groove guidance or rail guidance.

6. The seat (1 ) according to any one of the preceding claims, wherein the adjustment mechanism (10) includes at least a retainer mechanism (11 ) which is fixedly connected at one end with the head part (1.4) and at the opposite end with the backrest (1.1 ).

7. The seat (1 ) according to any one of the preceding claims, wherein a slider (7) or glider is provided, on which the adjustment mechanism (10) is fixed.

8. The seat (1 ) according to claim 7, wherein the slider (7) or glider is

movably arranged on the backrest side carrier part structure (2.1 ). 9. The seat (1 ) according to claim 7 or 8, wherein an inclination adjuster (5) is provided between the backrest (1.1 ) and a seat part (1.2), the inclination adjuster (5) coupled with a motion converter is such a way that a pivoting movement resulting from an inclination of the backrest (1.1 ) is converted into a translation of the slider (7) or glider.

10. The seat (1 ) according to claim 9, wherein the adjustment mechanism (10) is configured such that the translation of the slider (7) or glider is converted into a rotation of the link (G4) for adjusting the inclination of the head part (1.4).

Description:
Seat, in Particular Aircraft Seat

The invention relates to a seat, in particular an aircraft seat, adjustable in different positions.

Seats, in particular aircraft seats, which can be adjusted between a TTL position (taxi-take-off-and Landing-Position), a seating position and a lying position or bed position, are known in the art. The seat comprises

components such as a seat area, a backrest and a headrest.

The object of the present invention is to provide a seat, in particular an aircraft seat, which can adjusted in different positions in an easy way. The object is achieved by a seat according to claim 1.

Embodiments of the invention are subject of the dependent claims.

According to the invention, the object is achieved by a seat, in particular an aircraft seat, wherein the seat comprises a carrier structure with carrier part structures at least for a backrest and a head part, wherein an adjustment mechanism is arranged between a head side carrier part structure and a backrest side carrier part structure, the adjustment mechanism coupling the head side carrier part structure and the backrest side carrier part structure in such a manner that the head part necessarily adjusts into a horizontal plane with the backrest when the backrest is adjusted from a nearly vertical or inclined position of the backrest into a horizontal position or bed position such that an essentially flat plane is formed. One of the carrier part structures is arranged head side in the range of the head part or coupled with the head part and forms the head side carrier part structure, also referred to as head part carrier structure. Another one of the carrier part structures is arranged backrest side in the range of the backrest or coupled with the backrest and forms the backrest side carrier part structure, also referred to as backrest carrier part structure.

In particular, the adjustment mechanism is configured as a slide link arranged between the backrest carrier part structure and the head carrier part structure. The slide link can comprise a first link arm coupled with the backrest carrier part structure and a second link arm coupled with the head carrier part structure, wherein the first link arm and the second link arm are pivotably coupled to each other by a link, wherein the link is movably mounted along a guiding surface.

The slide link is a simple kinematic positive coupling which is for example arranged as a groove guidance or rail guidance in combination with a link mechanism, e.g. a lever mechanism.

In a possible embodiment, the guiding surface is configured as a sliding guidance or motion guidance, in particular a groove guidance or rail guidance. The adjustment mechanism of the head side carrier part structure is configured and coupled, in particular articulated, with a backrest side carrier part structure such that the head part necessarily adjusts into a plane with the backrest when the seat is adjusted from a nearly vertical or inclined position of the backrest relative to the seat part, in particular from a TTL position or one of the seat comfort positions, into a bed position such that an essentially flat bed plane or lying plane from the head part to the backrest is formed.

In a possible embodiment, the adjustment mechanism, in particular a kinematical positive coupling in combination with a link mechanism and/or lever mechanism, is configured such that the head part in the TTL position and/or in one of the seat comfort positions of the seat is adjusted in an inclined or pivoted position, in particular relative to the backrest about an angle of 12 to 17 In the bed position of the seat, the head part is collinear with the other components of the seat, in particular relative to the backrest and/or leg rest.

The advantages achieved by the invention are in particular that, by means of such a kinematic and hinged adjustment mechanism for positively motion coupling of the head part and the backrest, a manual and/or electrical actuation unit, in particular additional drive elements such as an electric motor, can be dispensed with.

In a possible embodiment, the adjustment mechanism includes at least a retainer mechanism which is fixedly connected, in particular articulated, at one end with the head part and at the opposite end with the backrest.

Furthermore, the adjustment mechanism comprises a sliding guidance or motion guidance, in particular a groove guidance or rail guidance for a carrier part structure of the backrest in the head part. In another embodiment, the adjustment mechanism is fixed to a slider or glider, which is slidably arranged on the backrest side carrier part structure, e.g. the backrest. For example, the slider is slidably arranged on a rail system. When the backrest is pivoted relative to a seat part, the slider simultaneously moves along the backrest toward the seat part thereby carrying the adjustment mechanism which is fixed to the slider. In particular, the adjustment mechanism is slidable along with the head part relative to the backrest. Thereby, the backrest, i.e. the backrest side carrier part structure, is pushed into a guiding arrangement which is formed within the head part. The guiding arrangement comprises a sliding guidance or a motion guidance, in particular a curved positive guidance, such that the head part is moved, in particular pivoted, relative to the backrest side carrier part structure. In a possible further embodiment, the adjustment mechanism is movable relative to the backrest side carrier part structure in a range from up to 100 mm, in particular 90 mm, e.g. 85 mm by means of the slider when the seat is adjusted from the inclined position, in particular the TTL position, of the backrest, into the bed position or lying position.

A further embodiment provides that the head part is pivotable by means of the link mechanism or lever mechanism relative to the backrest side carrier part structure within an angular range of 10° to 17°, in particular from 12° or 15°.

In a further embodiment, an inclination adjuster is provided between the backrest and a seat part, the inclination adjuster coupled with a motion converter is such a way that a pivoting movement resulting from an

inclination of the backrest is converted into a translation of the slider or glider. In particular, the adjustment mechanism is configured such that the

translation of the slider or glider is converted into a rotation of the link. For example, the inclination adjuster is a detent fitting or rotational fitting in the range of the pivot axis of the backrest. The motion converter is for example a cable pull.

Embodiments of the invention are explained in more detail with the help of drawings.

Figures 1 to 4 are different schematic views of a seat, in particular an

aircraft seat, in different positions,

Figures 5 to 8 are different schematic views and positions of a head part with an adjustment mechanism for positively coupling with a backrest. Corresponding parts are referred to by the same reference signs in all figures. Figure 1 is a schematic lateral view of a seat 1 , in particular a multi adjustable seat 1. The seat 1 is for example a vehicle seat or an aircraft seat.

The seat 1 is for example adjustable by means of a longitudinal adjuster LE, e.g. a rail system, in a longitudinal direction X into a respective longitudinal position L1 to Ln.

The seat 1 comprises a backrest 1.1 , a bottom part or seat part 1.2 and optionally a calf part 1.3. The backrest 1.1 and/or the optional calf part 1.3 are adjustable in their inclination relative to the seat part 1.2. Additionally, the seat 1 comprises a head part 1.4.

Figure 1 shows the seat 1 for example as an aircraft seat in a so called TTL Position P1 (TTL = Taxi-Take-OFF-and-Landing), in which the backrest 1.1 is arranged in a nearly vertical or slightly inclined position relative to the seat part 1.2. The seat 1 is adjustable into different positions P1 to P4 and between these positions.

The sequence of Figures 1 to 4 shows the adjustment of the seat 1 from a TTL position P1 via a seat comfort position P2 and a lying comfort

position P3 into a bed position P4. For this purpose at least the backrest 1.1 is pivoted relative to the seat part 1.2 according to arrow PF1.

Simultaneously, a slider 7 moves, in particular slides according to arrow PF 2 along the backrest 1.1 toward the seat part 1.2 thereby carrying a cover unit 3.1 which is fixed at the slider 7 such that the pivoting movement (arrow PF1 ) of the carrier part structure 2.1 of the backrest 1.1 is decoupled from the linear movement (arrow PF2) of the cover unit 3.1. In Figure 2 the seat 1 is shown in the seat comfort position P2, in which the backrest 1.1 is rearwardly inclined or pivoted relative to the seat part 1.2 according to arrow PF1 and the seat 1 is displaced forward in an X direction according to arrow PF4 relative to the floor mounted rail part of the

longitudinal adjuster LE and the seat part 1.2 is set, in particular moved, e.g. pivoted, upward in a Z direction relative to the longitudinal adjuster LE. In order to pivot the seat part 1.2 relative to the longitudinal adjuster LE, the seat part 1.2 is articulated at the longitudinal adjuster LE. For this purpose, a linkage mechanism 9.1 is arranged between the seat part 1.2 and the longitudinal adjuster LE. The linkage mechanism 9.1 is formed as a multi articulated linkage, e.g. a lever mechanism with multiple G1 , G2 and link arms GA. Figure 3 shows the seat 1 in a lying comfort position P3, in which the backrest 1.1 is even further rearwardly inclined or pivoted relative to the seat part 1.2 according to arrow PF1 and the seat 1 is automatically displaced forward in a seat direction or viewing direction according to arrow PF4 at least in part by means of the longitudinal adjuster LE and the seat part 1.2 is even further inclined downward toward the longitudinal adjuster LE according to arrow PF5.

Figure 4 shows the seat 1 in a lying position or bed position P4, in which the backrest 1.1 , the seat part 1.2 and the head part 1.4 are set into a common horizontal plane. For this purpose, the seat 1 is automatically set even further forward in a seat direction or viewing direction according to arrow PF4 by means of the longitudinal adjuster LE and the seat part 1.2 is automatically pivoted upward according to arrow PF5 relative to the longitudinal adjuster LE and the head part 1.4 is pivoted rearward according to arrow PF1 such that an essentially flat plane is formed from the head part 1.4 via the backrest 1.1 to the seat part 1.2. Optionally, the calf part 1.3 can be pivoted upward relative to the seat part 1.2 according to arrow PF3 and be adjusted in a plane with the head part 1.4, the backrest 1.1 and the seat part 1.2 such that the flat plane is lengthened accordingly by the length of the calf part 1.3. The seat 1 comprises at least a carrier structure 2 and a cushion element 4 and optionally the cover unit 3.

The carrier structure 2 is in particular configured as a carrier frame, a rack or a seat carrier. The carrier structure 2 is for example made from a metal or a reinforced plastic or a combination thereof.

The optional cover unit 3, also briefly referred to as cover or cover shell, is a comfort unit. The cover unit 3 serves for covering the frame type or rack type carrier structure and for receiving the cushion element 4.

The carrier structure 2 comprises at least a backrest side carrier part structure 2.1 (also referred to as backrest carrier part structure 2.1 ) for the backrest 1.1 and a head side carrier part structure 2.4 (also referred to as head carrier part structure 2.4) for the head part 1.4.

An adjustment mechanism 10 (shown in figures 1 to 8) is arranged between the head side carrier part structure 2.4 and the backrest side carrier part structure 2.1 , the adjustment mechanism 10 coupling the head side carrier part structure 2.4 and the backrest side carrier part structure 2.1 in such a manner that the head part 1.4 necessarily adjusts into a horizontal plane with the backrest 1.1 when the backrest 1.1 is adjusted from a nearly vertical or inclined position P 1 , P2 or P3 of the backrest 1.1 into a horizontal position, in particular a bed position P4, such that an essentially flat plane is formed. In this context, the adjustment mechanism 10 kinematically couples the head side carrier part structure 2.4 and the backrest side carrier part structure 2.1 together. The adjustment mechanism 10 as well as the length adjuster LE, the slider 7 and/or the inclination adjuster 5, 6 may be coupled to at least one drive element EM, e.g. an electrical motor, and a control module CM. The control module CM may comprise one or more processors and associated memories. An exemplary embodiment of the drive element/s EM and the control module CM, e.g. an external control module, are shown in figures 1 and 2. The control module CM is in communication with the at least one of the drive elements EM, the adjustment mechanism 10, the inclination adjuster 5, 6 and/or the length adjuster LE. In particular, the control module CM receives an input from a user to adjust the seat 1 e.g. from the TTL position P1 to the bed position P4 and generates a drive signal for at least one of the respective drive elements EM to actuate at least one of the adjustment device 10, the inclination adjuster 5, 6 and the length adjuster LE by at least one of the drive elements EM.

The respective seat component - backrest 1.1 , seat part 1.2, calf part 1.3 and/or head part 1.4 - can comprise an associated carrier part structure 2.1 , to 2.4 and an associated cover part unit 3.1 to 3.4. At least the backrest 1.1 and the seat part 1.2 comprise a carrier part structure 2.1 to 2.2 as well as a cover unit 3.1 to 3.2.

The cushion element 4 can be configured as one part and extends over the entire length and width of the seat 1 and thus over its seat components. In the alternative, the cushion element 4 can be multi part and respectively comprise one separate cushion part element 4 for each seat component.

In order to adjust the backrest 1.1 relative to the seat part 1.2, the associated carrier part structures 2.1 or 2.2 are connected to each other by means of an inclination adjuster 5, e.g. a detent fitting or rotational fitting. The backrest 1.1 , in particular its backrest side carrier part structure 2.1 with the cover unit 3.1 and the associated cushion element 4, is adjustable, in particular pivotably mounted, relative to the seat part 1.2, in particular its seat part side carrier part structure 2.2 with the cover unit 3.2 and the associated cushion element 4, forwardly and/or rearwardly about a pivot axis S1.

In order to adjust the calf part 1.3 relative to the seat part 1.2 the associated carrier part structures 2.3 or 2.2 are connected to each other by means of another inclination adjuster 6, e.g. a detent fitting or rotational fitting. The calf part 1.3, in particular its carrier part structure 2.3 with the cover unit 3.3 and the associated cushion element 4, is adjustable, in particular pivotably mounted, relative to the seat part 1.2, in particular its carrier part structure 2.2 with the cover unit 3.2 and the associated cushion element 4, forwardly and/or rearwardly about a pivot axis S2. The cover part units 3.1 and 3.2 of the backrest 1.1 and the seat part 1.2 are separate from each other. This allows for moving the backrest side cover part unit 3.1 relative to the seat part 1.2 and its components.

In a further embodiment, the cover part unit 3.2 of the seat part 1.2 and the cover part unit 3.3 of the calf part 1.3 can be configured as one part and arranged at a predetermined angle relative to each other, in particular in a range from 85° to 95° (not illustrated).

Furthermore, the cover part unit 3.1 can for example be fixed to the at least one slider 7. The slider 7 or glider is slidably arranged at the backrest side carrier part structure 2.1 of the backrest 1.1 , for example at the rail system 7.1.

Figure 2 is an exemplary lateral view of the seat 1 in the seat comfort position P2 with the slider 7 partially displaced downward. The adjustment of the seat can be electrical or manual. Figure 3 is a schematic lateral view of the seat 1 in the lying comfort position P3, in which the slider 7 is displaced even farther downward. Figure 4 is a schematic lateral view of the seat 1 in the bed position P4. In order to restrict the downward linear adjustment range of the slider 7, the backrest side carrier part structure 2.1 of the backrest 1.1 comprises a stop 8 for the slider 7 in the range of the inclination adjuster 5, in particular above it. In addition, a counter stop 7.2, e.g. in the form of a stop peg, can be provided on the slider 7.

In addition, the backrest side cover part unit 3.1 can be connected with the seat part side carrier part structure 2.2 by means of a further linkage mechanism 9.2. The further linkage mechanism 9.2, in particular a multi articulated linkage, for example a lever mechanism, is configured such that the backrest side cover part unit 3.1 is movable relative to the seat part side carrier part structure 2.2 in a first adjustment range V1 of up to 100 mm, in particular 90 mm, e.g. 85 mm by means of the slider 7 when the seat 1 is adjusted from the TTL position P1 into the bed position P4.

Figures 5 to 6 are schematic lateral views of a head part 1.4 for a seat 1 in different positions. Figure 5 shows the head part 1.4 in an inclined position relative to the backrest 1.1 and its backrest side carrier part structure 2.1 , which position the head part 1.4 assumes in the TTL position P1 of the seat 1. In this TTL position P1 , the head part 1.4 is slightly forwardly inclined relative to the backrest 1.1.

Figure 6 shows the head part 1.4 in a straight position relative to the backrest 1.1 , which position the head part 1.4 assumes in the bed position P4. In this straight position, the head part 1.4 is adjusted into a horizontal plane with the backrest 1.1 in order to form an essentially flat plane in the bed position P4 of the seat 1.

The head part 1.4 comprises a cover part unit 3.4. For example, the cover part unit 3.4 is formed by two shells which are connected to each other by connection elements such as screws. Furthermore, the head part 1.4 comprises an associated head side carrier part structure 2.4 which forms a horizontal connection between the backrest side carrier part structures 2.1 , in particular lateral parts of the backrest 1.1. Thus, a so called backrest frame is formed. In particular, the backrest side carrier part structure 2.1 and the head side carrier part structure 2.4 are configured as round pipes. The headside carrier part structure 2.4 can partially be made from a bent round pipe. The backrest side carrier part structure 2.1 is can be configured structurally solid. Moreover, the head part 1.4 comprises the inclination adjuster 10, in particular a kinematic positive coupling in combination with a further linkage mechanism 9.3, e.g. a lever mechanism.

The adjustment mechanism 10 is configured and coupled with the carrier structure 2, in particular the backrest side carrier part structure 2.1 of the seat 1 , such that the head part 1.4 necessarily adjusts into a plane with the backrest 1.1 when the seat 1 is adjusted into the bed position P4 such that an essentially flat bed plane or lying plane is formed. In other words, the head part 1.4 is adjusted collinear with the backrest 1.1 in the bead position P4 by means of the adjustment mechanism 10.

When the seat 1 is moved back into the TTL position P1 according to arrow PF1 , the head part 1.4 is automatically adjusted into an inclined TTL-position P1 by means of the adjustment mechanism 10. The adjustment mechanism 10 can be configured as a lever link HG. The lever link HG comprises a first link arm GA1 coupled with the backrest side carrier part structure 2.1 and a second link arm GA2 coupled with the head side carrier part structure 2.4, wherein the first link arm GA1 and the second link arm GA2 are pivotably coupled to each other by a link G4. The second link arm GA2 necessarily deflects and adjusts the head part 1.4 into the horizontal plane with the backrest 1.1 because of a restricted guidance of the head side carrier part structure 2.4 in the guiding arrangement F along the guiding surface 12 when the backrest 1.1 is pivoted.

The guiding surface 12 is for example configured as a sliding guidance or motion guidance, in particular a groove guidance or rail guidance.

The adjustment mechanism 10 includes at least a retainer mechanism 11 which is fixedly connected at one end with the head part 1.4 and which at the opposite end is articulated with the backrest 1.1. The retainer mechanism 11 and the lever link HG can be configured as one part. In particular, the lever link HG of the adjustment mechanism 10 can form the retainer mechanism 1 1 .

In particular, the retainer mechanism 11 comprises two fitting parts 11.1 , 11.2 which are movable, in particular pivotable, relative to each other. The fitting parts 11.1 , 11.1 form for example a friction fitting or detent fitting, wherein the fitting parts 11.1 , 11.2 fasten the head part 1.4 in an adjusted position thereof by frictional fit or force fit.. Moreover, the fitting parts 11.1 , 11.2 are arranged movable relative to each other on a pivot axis SA and thus form the link G4 with the first link arm GA1 and the second link arm GA2.

For example, one of the fitting parts 11.1 , 11.2 is fixedly connected to the cover part unit 3.4 of the head part 1.4 and one of the fitting parts 11.1 , 11.2 is fixedly connected to the backrest 1.1. In particular, the backrest side fitting part 11.1 is fixed to the slider 7 or glider or connected to a component, in particular an extension arm 7.3 of the slider 7. The slider 7 can be arranged on a front side of the backrest 1.1 or on a rear side of the backrest 1.1. In particular, the head part 1.4, i.e. in particular the cover part unit 3.4 and the adjustment mechanism 10, is movably arranged, in particular pivotably arranged, on the carrier part structure 2.1 of the backrest 1.1 relative to the carrier part structure 2.1 and thus relative to the backrest 1.1 by means of the slider 7, e.g. by positive guidance along the guiding surface 12 of the guiding arrangement F. The free end of the carrier part structure 2.1 is inserted into the guiding arrangement F and guided along the guiding surface 12.

The fitting parts 11.1 , 11.2 (= link arms GA1 , GA2) can be pivoted in an angular range of 15°, in particular 12°, relative to each other. For example, the fitting parts 11.1 , 11.2 exhibit an angle a of 12°in the TTL position P1 as shown in Figure 5. In the bed position P4, as shown in Figure 6 gezeigt, the fitting parts 11.1 , 11.2 are essentially collinearly arranged relative to each other.

When the backrest 1.1 is pivoted relative to the bottom part or seat part 1.2 (according to arrow PF1 ), the slider 7 moves simultaneously along the backrest 1.1 toward the seat part 1.2 (according to arrow PF2) and carries the adjustment mechanism 10 which is fixed to the slider 7. In particular, the adjustment mechanism 10 is movably arranged together with the head part 1.4 relative to the backrest 1.1. At the same time, the backrest 1.1 (according to arrow PF3), i.e. the backrest side carrier part structure 2.1 , is pushed into a guiding arrangement F which is formed within the head part 1.4. The guiding arrangement F comprises a sliding guidance or a motion guidance, in particular a curved positive guidance along the guiding surface 12, such that the head part 1.4 is moved, in particular pivoted, relative to the backrest side carrier part structure 2.1. The guiding arrangement F exhibits dimensions corresponding to backrest side carrier part structure 2.1. In particular, a diameter of the guiding arrangement F essentially corresponds to a diameter of the backrest side carrier part structure 2.1 , which can for example be arranged as a round pipe.

By means of the curved guiding arrangement F the head part 1.4 is pivotably arranged on the backrest 1.1 relative to the carrier part structure 2.1. In a possible further embodiment, the adjustment mechanism 10 is movable relative to the backrest side carrier part structure 2.1 in a second adjustment range V2 of up to 100 mm, in particular 90 mm, e.g. 85 mm by means of the slider 7 when the seat 1 is adjusted from the TTL position P1 into the bed position P4. In this case, the second adjustment range V2 is identical with the first adjustment range V1.

Figures 7 and 8 are schematic perspective views of a head part 1.4 seen almost from the front and almost from behind. In Figures 5 to 8 the head part 1.4 is shown for clarity without the cushion.

In Figures 7 and 8 an embodiment of the head part 1.4 with the cover part unit 3.4 is shown. The cover part unit 3.4 exhibits a matching geometry respectively on a front side 3.4.1 and on a rear side 3.4.2. In a central area MB of the respective front side 3.4.1 and the rear side 3.4.2 forms

corresponding to each other are formed. The front side 3.4.1 comprises a predominantly inwardly, in the direction of the rear side 3.4.2 dented, curved form. The rear side 3.4.2 comprises a predominantly outwardly curved form corresponding with the inwardly dented and curved form of the front side 3.4.1. Thus, the curved guiding arrangement F can be formed within the cover part unit 3.4. Further embodiments are possible, wherein for example the front side 3.4.1 and the rear side 3.4.2 are predominantly uniformly arranged, in particular flat. An inner structure of the cover part unit 3.4 can form the curved guiding arrangement F, e.g. by an additional guiding part.

List of References

1 seat

1.1 backrest

1.2 bottom part or seat part

1.3 calf part

1.4 head part

2 carrier structure

2.1 bis 2.4 carrier part structure

3 cover unit

3.1 bis 3.4 cover part unit

3.4.1 front side

3.4.2 rear side

4 cushion element

5, 6 inclination adjuster

7 slide

7.1 rail system

7.2 counter stop

7.3 extension arm

8 stop

9.1 , 9.2, 9.3 linkage mechanism

10 adjustment mechanism

11 retainer mechanism 11.1 , 11.2 fitting part

12 guiding surface

CM control module

EM drive element

F guiding arrangement

GA link arm GA1 , GA2 link arm

G1 -G4 link

L1 -Ln longitudinal position LE longitudinal adjuster MB central area

P1 TTL position

P2 sitting comfort position

P3 lying comfort position

P4 bed position

PF1 , PF2, PF3, PF4, PF5 arrow S1 , S2 pivot axis

SA pivot axis

FIG lever link

V1 , V2 adjustment range a angle