EP2605934A1

EP2605934A1 - Vehicle seat having a convex seat back

Info

Publication number: EP2605934A1
Application number: EP11741188.4A
Authority: EP
Inventors: Erika Gabel; Frank Kemmerling; Gerd Meyer; Claus Monath; Kaspar Schroeder-Bodenstein; Michael Zwicke
Original assignee: Siemens AG
Current assignee: Siemens AG
Priority date: 2010-08-17
Filing date: 2011-08-02
Publication date: 2013-06-26
Also published as: DE102010039409A1; DE102010039409B4; WO2012022605A1

Abstract

The invention relates to a vehicle seat, in particular for spacious rail vehicles, which can be adjusted between a sitting position (A) and a reclining position (B) and comprises a seat cushion (2) and a seat back (1) having a backrest cushion (4), each being supported on a frame (3), wherein a transition between the sitting position (A) and the reclining position (B) for changing the outer shape of the vehicle seat takes place by a relative movement of the seat cushion (2) with respect to the seat back (1), wherein by implementing the relative movement between the seat cushion (2) and the seat back (1) the contour of the backrest cushion (4) can be changed in such a way that in the reclining position (B) a contour of the backrest cushion (4) has a greater convexity directed toward the front than in the sitting position (A).

Description

description

Vehicle seat with arched backrest

The invention relates to a vehicle seat,

in particular for large-scale rail vehicles, which is adjustable between a sitting position and a reclining position and a seat cushion and a backrest with a

Back pad has, each on a frame

supported, wherein a transition between the sitting position and the reclining position, which causes a change in the outer shape of the vehicle seat, takes place by a relative movement of the seat cushion relative to the backrest.

Such vehicle seats are well known in the art. For example, reference is made to DE 10 2007 012 728 A1, which discloses a vehicle seat with a backrest, which is divided into two sections. In this case, an upper portion is fixedly mounted on the frame, while the lower portion follows a horizontal movement of the seat cushion, so that an inclination of the lower portion of the

Back pad is changed. In rail vehicle construction are often come from management forms in which in the transition from the sitting position to the lying position in a relative movement between

Seat cushion and back cushion, the seat cushion is moved horizontally forward, while the backrest is tilted to a shallower position. However, this embodiment requires in the longitudinal direction of the vehicle in the

Lying considerable space, since in the lying position, the front end of the seat cushion and the rear end of the backrest occupy more outward positions, as in the sitting position. This can include one

Knee clearance affect a located behind the considered vehicle seat further vehicle seat. Likewise, a kneeling freedom of the considered vehicle seat be reduced. Overall, the vehicle seat in the longitudinal direction of the vehicle requires a considerable amount of space.

Proceeding from this, the present invention seeks to produce a vehicle seat, which provides a high seating comfort for a passenger with little space in the longitudinal direction of the vehicle in its reclining position.

This object is achieved in that by implementing the relative movement between the seat cushion and the backrest, the back cushion is variable in its contour such that a contour of the back cushion in the lying position has a stronger, forward bulge than in the sitting position.

In such a vehicle seat, the occupied space changes when taking the lying position only slightly from

the one needed in the seating position. The bulge occurring in the lying position of the backrest causes a high degree of comfort of the vehicle seat in the lying position.

A "lying position" or "lying position" relative to a seat position or seat position of the vehicle seat is to be understood in particular as a position in which the back of a passenger located in the vehicle seat with a greater inclination relative to the vertical direction than in the sitting position or sitting position of Back pad is supported.

The vehicle seat has a leading edge formed by the seat cushion and extending in a lateral direction, which is arranged in a row in a vehicle,

in particular a rail vehicle, facing a front seat and / or facing away from a rear seat. It also has a seating direction, which is aligned horizontally and perpendicular to the lateral direction. The sitting direction corresponds in particular to the orientation of the thighs a passenger assuming a normal sitting position with uncrossed legs. It is oriented starting from the back pad in the direction of the front edge. The term "forward" here refers to a direction in which-with respect to a disassembly in the seat direction and the lateral direction-the largest component is oriented in the seat direction

Vehicle seat can be achieved, in which an area of the lumbar spine of a person using the passenger seat is supported.

In one embodiment, the convexity of the back pad present in the lying position of the vehicle seat is only present over a vertical portion of the back pad. This is basically sufficient for a suitable back support of a passenger.

In another embodiment, however, the present in the reclining position of the vehicle seat bulge of the back pad in the vertical direction continuously

be present, so that over a larger vertical range, a suitable adaptation to a general contour can be achieved on the back of a person.

In principle, any relative movement between seat cushion and backrest can be used to provide suitable

Implementation agent bring about the bulge of the back cushion in the lying position. However, in one embodiment, to facilitate the relative movement between

Seat cushion and the backrest, the seat cushion against the backrest horizontally movable. For example, if a lower edge of the back pad substantially

is connected in a fixed angle with a rear edge of the seat cushion, the desired bulge forms in the

Lying down automatically when the seat cushion is pushed forward. Alternatively, it is also possible that to allow the relative movement between the seat cushion and the backrest, the seat cushion fixed and the backrest relative to the seat cushion is tilted. Here are suitable measures to be taken to ensure that the tilting movement of the backrest is implemented such that the back pad shows the desired bulge.

A structurally simple embodiment of the vehicle seat can be achieved if, the backrest with respect to the vertical direction in a lower region, an upper

Area and at least a central area is divided, wherein by implementing the relative movement between the

Seat cushion and the backrest, the central region performs a tilting movement at least relative to the lower region. This results in the bulge preferably in the transition region between the central region and the lower region, which is particularly suitable for an advantageous support of the passenger back in the lumbar spine according to a lordosis support position.

In this case, a large bulge can be achieved in a targeted manner in this area, if by implementing the relative movement between the seat cushion and the backrest at least two regions perform a tilting movement, wherein the central region performs the greatest inclination relative to the vertical direction. As a result, a particularly high level of comfort can be achieved. At least the region of the bulge of the back pad may be supported by at least one support member between the back cushion and the frame, wherein the support member is changeable in position relative to the frame and the relative movement between the seat cushion and the backrest follows such that in the lying position the bulge is present. Such a support element causes when occupying the vehicle seat, the bulge can not be pressed by a load by the passenger inward. To Need can in the area of the back pad more

Support elements may be provided, their respective

Position change of the degree of bulge of the

Back pad in their area depends.

To change the position, the support element can be movably mounted and / or formed by a deformable element, such as, for example, a variable in its length expansion or an inflatable element.

Preferred are further, at least partially in their

Position relative to the frame variable support elements between the back cushion and a head cushion on the one hand and the frame on the other hand provided, which

Follow relative movement between the seat cushion and the backrest so that the backrest in the lying position in cross section has an elongated S-shape, in the lower region of the bulge is. The selected S-shape allows a particularly favorable adaptation to the contour of the back of a person who uses the vehicle seat. The cross section is preferably in a vertical and parallel to the seat direction plane.

The support elements need not all have an equal degree of mobility, because for example at the top and bottom of the region of the bulge and further away from the bulge, it may be sufficient if the support elements substantially the movement of the

Seat pad follow. In contrast, support elements in the region of the bulge must have a higher degree of mobility.

Embodiments of the invention will be explained in more detail with reference to the drawings. Show it : Figure 1 is a schematic side view of a

Passenger seat both in a sitting and in a lying position, Figure 2 is a schematic representation of the relative

Angular positions of components of the passenger seat of Figure 1, and

Figure 3 is a schematic side view of the passenger seat with support elements.

Figure 1 shows a cross-sectional view of a

Passenger seat for a large-scale rail vehicle, with a backrest 1 and a seat cushion 2, wherein a

Lying position B of the passenger seat with solid lines and a sitting position A thereof is shown with dashed lines. Both the backrest 1 and the

Seat cushion 2 are supported on a frame 3. The passenger seat is placed on a vehicle floor F by means not shown and has a seating direction S, which is parallel to the floor F

is aligned. In the representation of the passenger seat, this is cut along a vertical plane, which is aligned parallel to the seat direction S.

In the sitting position A of the passenger seat, the

Backrest 1 overall on a rather flat contour.

In contrast, the backrest 1 in the lying position B can be divided in its vertical direction into three sections la, lb, lc, wherein the sections la, lb and a lower portion of the section lc are to be assigned to a back cushion 4, while the remaining portion of the section lc to the top edge of the backrest 1 a head cushion 5 corresponds.

It can be seen that at a transition between the sitting position and the lying position in the vertical sections la and lc of the backrest 1, the angle of the same relative to the seat cushion 2 little to no changes, while due to a greater inclination of the central portion lb relative to the vertical direction than the other sections la and lc, the back pad 4 in the transition region between the

middle section lb and the lower portion la in the lying position of the vehicle seat shows a stronger, forward bulge, as is the case in the sitting position. As can be seen from a comparison of the sitting and lying position, the convexity of the back cushion contour takes place in a direction D, which is aligned with respect to the seat direction S to the front. This bulge makes it possible, in the sense of a lumbar support, to support a lumbar region of a person using the vehicle seat in the lying position B in a comfortable manner.

In the illustrated embodiment, the contour transitions of the vertical sections la and lc in the direction of the central vertical section lb are carried out continuously. In another embodiment, it is also possible that the transition between the sitting position A and the

Lying B the contour of the sections la and lc

completely unchanged while the bulge

comes about due to a taking place only in the central vertical section lb contour change.

Due to the low contour of the backrest 1 in the

Sitting position provides the passenger seat in this position a low lumbar support, but is space-saving.

In contrast, he offers a passenger in the lying position a desired back support.

In general, the backrest 1 in the lying position in cross-section an elongated S-shape, in the lower region of the bulge is present. In contrast, there is also in the sitting position an elongated S-shape of the backrest 1, wherein, however, the bulge of the backrest 4 is much less pronounced. In the illustrated embodiment, the transition between the sitting position A and the lying position B by moving the seat cushion 2 in the horizontal direction forward, ie in the seat direction S. This is followed by a lower

Edge region of the vertical portion la of the back cushion 4 of the movement of the seat cushion 2, under

Maintaining the angular position. As a result, formed in the lying position above mentioned bulge in

Back cushion 4. Insofar, the relative movement of the

Seat cushion 2 relative to the backrest 1 implemented such that there is the desired bulge for the reclining position. In an alternative embodiment, it is also possible that the relative movement in the form of a

Tilting movement of the backrest 1 relative to the then stationary seat cushion 2 takes place. Also in this way can be in the sitting position of the passenger seat in the sitting position not so strong existing bulge in the back pad 4 cause. Figure 2 shows schematically relative angular positions of

Seat cushion 2 to the sections la, lb, lc of the backrest 1 in the lying position of the passenger seat. there

a dotted line illustrates the sitting position, wherein the lying position is shown by a solid line. An angle illustrates the angle of the

Vertical section lb between sitting and lying position and AL a horizontal distance of the transition region between the vertical sections la and lb between lying and

Sitting position. This distance AL corresponds to one

Extension change of the passenger seat between lying and sitting position. Compared to the prior art, this expansion change is small, so that the passenger seat in its two positions a small space in

Vehicle longitudinal direction required.

To bring about the change in contour of the back pad 4 between the sitting position A and the lying position B support elements 6a, 6b, 6c are provided, which over the backrest 1 are distributed and lie between the back cushion 4 and the frame 3. This is illustrated in FIG. 3, which essentially corresponds to the representation of FIG. At the transition between the sitting position A and the

Lying position B change the positions of the

Support elements 6a, 6b, 6c relative to the frame 3. The positions assumed in the sitting position are by means of

dashed lines shown, with the clarity of a dashed representation of the support member 6c has been omitted. The support elements 6a, 6b, 6c are each a in the illustrated embodiment

different vertical section la, lb and lc of the backrest 1 assigned.

Respective end positions of the support elements 6a, 6b, 6c are designed lockable, so that in particular the present in the lying position B bulge is maintained even under load.

Claims

claims

Vehicle seat, especially for large-scale

Rail vehicles, which is adjustable between a sitting position (A) and a reclining position (B) and a seat cushion (2) and a backrest (1) with a back cushion (4), each at one

Frame (3) are supported, with a transition

between the sitting position (A) and the reclining position (B), which causes a change in the outer shape of the vehicle seat, by a relative movement of the seat cushion (2) relative to the backrest (1), characterized in that

by implementing the relative movement between the

Seat cushion (2) and the backrest (1) the

Back pad (4) in its contour is variable such that a contour of the back pad (4) in the lying position (B) has a stronger, forward bulge than in the sitting position (A).

Vehicle seat according to claim 1,

characterized in that

in the lying position (B) of the vehicle seat

present convexity of the back pad (4) over a vertical portion (lb) of the back pad (4) is present.

Vehicle seat according to claim 1,

characterized in that

in the lying position (B) of the vehicle seat

present bulge of the back pad (4) in the vertical direction is continuously present. Vehicle seat according to one of claims 1 to 3,

characterized in that

for enabling the relative movement between the

Seat cushion (2) and the backrest (1), the seat cushion (4) relative to the backrest (1) is horizontally movable.

Vehicle seat according to one of claims 1 to 3,

characterized in that

for enabling the relative movement between the

Seat cushion (2) and the backrest (1) the seat cushion (2) stationary and the backrest (1) relative to the seat cushion (2) is tilted.

Vehicle seat according to one of the preceding claims, characterized in that

the backrest (1) with respect to the vertical direction in a lower region (la), an upper region

(lc) and at least a middle region (lb)

is divided, whereby by conversion of the

Relative movement between the seat cushion (2) and the backrest (1) of the central region (lb) a

Tilting movement at least relative to the lower area

(la) executes.

Vehicle seat according to claim 6,

characterized in that

by implementing the relative movement between the

Seat cushion (2) and the backrest (1) at least two areas (la, lb) perform a tilting movement, wherein the central region (lb) performs the greatest inclination relative to the vertical direction. Vehicle seat according to one of claims 1 to 7,

characterized in that

at least the area of the bulge of the

Back support (4) via at least one support element (6b) between the back cushion (4) and the frame (3) is supported, wherein the support element (6b) in its position relative to the frame (3) is variable and the relative movement between the seat cushion ( 2) and the backrest (1) follows such that in the

Lying position (B) the bulge is present.

Vehicle seat according to claim 8,

characterized in that

further, in their position relative to the frame (3) variable support elements (6a, 6c) between the

Back cushion (4) and a head pad (5) on the one hand and the frame (3) on the other hand are provided, which follow the relative movement between the seat cushion (2) and the backrest (1) such that the

Backrest (1) in the lying position (B) in cross section has an elongated S-shape, in the lower region of the bulge is.