Automobile seat having a four-link backrest pivoting mechanism and a two-link seat portion pivoting mechanism

An automobile seat is provided that includes, but is not limited to a backrest, a seat portion, a backrest pivoting mechanism, and a two-link seat-portion pivoting mechanism. The seat portion is fastened to the backrest or the backrest pivoting mechanism so that it is pivotable about a first transverse axis and the backrest is fastened to the backrest pivoting mechanism so that it is pivotable about a second transverse axis, so that the backrest may be pivoted from a usage position in which the seat portion adopts a first position, forward about the second transverse axis into a non-usage position, in which the seat portion occupies a second position, in which the seat portion is displaced rearward with respect to the first position. The backrest pivoting mechanism is a four-link backrest pivoting mechanism, which is configured in such a manner that the second transverse axis may be displaced rearward into the non-usage position by pivoting the backrest.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to German Patent Application No. 102008004230.7-16, filed Jan. 14, 2008, which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

The present invention relates to an automobile seat comprising a backrest, a seat portion, that is fastened to the backrest so that it is pivotable about a first transverse axis, a backrest pivoting mechanism, and a two-link seat portion pivoting mechanism, wherein the backrest is fastened to the backrest pivoting mechanism so that it is pivotable about a second transverse axis, so that the backrest may be pivoted from a usage position, in which the seat portion occupies a first position, about the second transverse axis forward into a nonusage position, in which the seat portion occupies a second position, in which the seat portion is offset rearward with respect to the first position.

BACKGROUND

DE 10 2006 033 554 A1 describes a foldable vehicle seat. The known vehicle seat comprises a backrest and a cushion carrier for the seat cushion, wherein the cushion carrier is fastened to the backrest by means of a supporting part in such a manner that the cushion carrier may be pivoted about a first transverse axis relative to the backrest. In addition, a backrest pivoting mechanism is provided for the backrest, wherein the backrest is fastened to the backrest pivoting mechanism so that it is pivotable about a second transverse axis. In this case, the second transverse axis is fixed, i.e. it is disposed immovably inside the automobile unless the entire vehicle seat were to be shifted in the longitudinal or transverse directions inside the automobile. The backrest may now be pivoted from a usage position, in which the backrest is disposed substantially upright, frontward about the second transverse axis into a nonusage position, in which the backrest is disposed substantially horizontally above the seat portion. The cushion carrier of the seat portion is thereby connected in such a manner to the backrest via the supporting part and to the vehicle floor via a two-link seat portion pivoting mechanism such that due to the movement of the backrest from the usage position into the nonusage position, the cushion carrier is moved from a first position into a second position, wherein in the second position, the cushion carrier is displaced rearward and lowered compared with the first position. Due to the rearward and downward displacement of the cushion carrier, in the nonusage position the backrest can approximately occupy the place that had previously been occupied by the seat cushion carrier of the seat portion, so that the vehicle seat in the nonusage position only takes up little space inside the vehicle.

The previously described known vehicle seat, however, has the disadvantage that the vehicle seat in the nonusage position still extends relatively far forward in the seat direction, even when the seat portion or the seat cushion carrier was displaced rearward by the pivoting movement. Thus, the known vehicle seat, for example, cannot be arranged in the second or third seat row of an automobile if the seat front located in front in each case is disposed relatively close to that seat row in which the known vehicle seat is located. In such a case, a collision could occur between the backrest of the vehicle seat and the backrest of another vehicle seat in the seat row located in front thereof. In addition, it is desirable in some cases that the seat portion is displaced further rearward inside the automobile when the vehicle seat is located in the nonusage position. Furthermore, the backrest in the nonusage position takes up a large amount of space in the height direction.

It is therefore an object of the present invention to provide an automobile seat which overcomes the previously specified disadvantages, which has a relatively simple structure, and can be folded in a particularly space-saving manner into a nonusage position. In addition, other objects, desirable features, and characteristics will become apparent from the subsequent summary and detailed description, and the appended claims, taken in conjunction with the accompanying drawings and this background.

SUMMARY

The automobile seat according to an embodiment of the invention comprises a backrest and a seat portion. The automobile seat further comprises a two-link seat-portion pivoting mechanism and a backrest pivoting mechanism, wherein the seat portion is fastened to the backrest or the backrest pivoting mechanism so that it is pivotable about a first transverse axis. The backrest is fastened to the backrest pivoting mechanism so that it is pivotable about a second transverse axis. Thus, the backrest may be pivoted from a usage position forward about the second transverse axis into a nonusage position. In the usage position, the backrest may be disposed upright for example, whereas in the nonusage position this may be aligned horizontally. When the backrest is located in the usage position, the seat portion occupies a first position. Due to the pivoting movement of the backrest into the nonusage position, the seat portion fastened to the backrest is also moved into a second position in which the seat portion is displaced rearward with respect to the first position. According to the innovation, the backrest pivoting mechanism is a four-link backrest pivoting mechanism, which is configured in such a manner that the second transverse axis may be displaced rearward by pivoting the backrest into the nonusage position.

Due to the rearward displacement of the second transverse axis, which corresponds to a rearward displacement of the backrest in the nonusage position, the backrest does not extend as far forward in the nonusage position as is the case in the prior art according to DE 2006 033 554 A1. On the contrary, the automobile seat according to an embodiment of the invention may be disposed particularly advantageously in a second, third, or rearmost seat row without the forward-pivoted backrest colliding with the backrest of a vehicle seat in the seat row located in front thereof. The automobile seat according to an embodiment of the invention therefore exhibits its advantages particularly in an automobile that has two or more seat rows located close to one another. In addition, the fastening of the seat portion to the backrest need not necessarily be made in a lower section of the backrest, which extends below the second transverse axis. On the contrary, the seat portion may also be fastened in an upper section of the backrest, which extends above the second transverse axis, especially as the rearward displacement of the seat portion into the second position is already taking place due to the rearward displacement of the second transverse axis or the backrest.

In a preferred embodiment of the automobile seat according to the invention, the four-link backrest pivoting mechanism is configured in such a manner that the second transverse axis may be displaced downward by pivoting the backrest into the nonusage position. In this way, the backrest takes up less space in the height direction in the nonusage position.

In a particularly preferred embodiment of the automobile seat according to the invention, the backrest comprises in relation to its longitudinal direction an upper section and a lower section. The upper section is disposed in front of the second transverse axis whereas the lower section extends behind the second transverse axis. At the same time, the seat portion is fastened to the lower section so that it is pivotable about the first transverse axis. In this way, the seat portion is displaced rearward both due to the pivoting movement of the backrest about the second transverse axis and also due to the rearward displacement of the backrest during pivoting into the nonusage position. Thus, the seat portion is displaced particularly far backward within the automobile so that in the nonusage position the backward-displaced backrest may approximately occupy the position which had previously been occupied by the seat portion in the first position. As a result, a particularly space-saving accommodation of the automobile seat in the nonusage position is achieved.

In a further preferred embodiment of the automobile seat according to the invention, a supporting device is provided, which may comprise, for example, the vehicle floor and/or a vehicle seat substructure. The four-link backrest pivoting mechanism comprises a first pivoted lever, which is fastened to the backrest so that it is pivotable about the second transverse axis on the one hand and which is fastened to the supporting device so that it is pivotable about a third transverse axis on the other hand, and a second pivoted lever, which is fastened to the supporting device so that it is pivotable about a fourth transverse axis on the one hand and is fastened to the backrest so that it is pivotable about a fifth transverse axis on the other hand. The second, third, fourth, and fifth transverse axis thus form a four-bar linkage in relation to a side view of the automobile seat, which on the one hand ensures a high stability of the backrest and on the other hand can be implemented particularly simply.

In an advantageous embodiment of the automobile seat according to the invention, the supporting device is a vehicle floor and/or a vehicle seat substructure. Thus, for example, the automobile seat may be fastened directly to the vehicle floor. However, it is further possible that the automobile seat has a vehicle seat substructure, which is in turn disposed on the vehicle floor, wherein the vehicle seat substructure could in turn be fastened displaceably on the vehicle floor.

In order to allow sufficient pivotability of the backrest with the aid of the four-link backrest pivoting mechanism, in a further preferred embodiment of the automobile seat according to the invention, the distance between the second and fifth transverse axis is configured to be shorter than the distance between the third and fourth transverse axis. The distances specified here and subsequently designate the distances between the transverse axes when these are viewed in the transverse direction, i.e. from the side.

According to a particularly advantageous embodiment of the automobile seat according to the invention, the third transverse axis is disposed higher than the fourth transverse axis.

According to a further advantageous embodiment of the automobile seat according to the invention, the fourth transverse axis is disposed behind the third transverse axis in the direction opposite to the seat direction.

In order to be able to implement the automobile seat in a constructively particularly simple manner, in a further preferred embodiment of the automobile seat according to the invention, the distance between the second and third transverse axis corresponds to the distance between the fourth and the fifth transverse axis. Thus, the first and second pivoted levers can be configured identically in order to reduce the number of components in the automobile seat according to an embodiment of the invention and therefore the manufacturing expenditure.

In a further particularly advantageous embodiment of the automobile seat according to the invention, the two-link seat portion pivoting mechanism cooperates with the four-link backrest pivoting mechanism in such a manner that the seat portion is inclined with respect to the horizontal in the first position and is disposed in the horizontal in the second position. Such an inclination of the seat portion in the first position is desirable since the vehicle occupant sitting on the seat portion may sit particularly securely on the automobile seat as a result. For this purpose, the seat portion should be inclined upward in the seat direction. In the second position of the seat portion, which could be designated as the stowing position, however, this is no longer necessary so that a particularly space-saving stowing is possible due to the horizontal arrangement.

In order to configure the space occupied by the automobile seat in the nonusage position as even smaller, in a further advantageous embodiment of the automobile seat according to the invention, the seat portion in the second position is further lowered compared with the first position.

In order to achieve a particularly simple two-link seat portion pivoting mechanism, in a further particularly advantageous embodiment of the automobile seat according to the invention, this comprises a third pivoted lever, which is fastened to the seat portion so that it is pivotable about a sixth transverse axis on the one hand and which is fastened to the supporting device so that it is pivotable about a seventh transverse axis on the other hand.

In a further advantageous embodiment of the automobile seat according to the invention, the third pivoted lever is inclined forward in the first position of the seat portion.

According to a further advantageous embodiment of the automobile seat according to the invention, the third pivoted lever is inclined backward in the second position of the seat portion.

In a further preferred embodiment of the automobile seat according to the invention, the third, fourth, and seventh transverse axis are disposed immovably with respect to the supporting device.

In a further preferred embodiment of the automobile seat according to the invention, a head rest is provided, which is disposed on the backrest so that it is pivotable about a pivot axis.

In a further particularly preferred embodiment of the automobile seat according to the invention, the pivot axis extends transverse to the seat direction, wherein in the nonusage position of the backrest, the head rest may be folded forward by at least 90o about the pivot axis. Due to the rearward displacement of the seat portion in the nonusage position of the backrest, a collision with the seat portion is prevented, wherein the folding of the head rests effects a space-saving shortening of the backrest in its longitudinal direction.

In a further particularly preferred embodiment of the automobile seat according to the invention, the seat portion is fastened to one of the pivoted levers of the four-link backrest pivoting mechanism so that it is pivotable about the first transverse axis. The seat portion is preferably fastened to the second pivoted lever. As a result, the assembly of the backrest is simplified.

In a further advantageous embodiment of the automobile seat according to the invention, the first transverse axis corresponds to the second or fifth transverse axis in order to reduce the number of pivot axes.

In a further advantageous embodiment of the automobile seat according to the invention, the first transverse axis is disposed on the first pivoted lever between the second and third transverse axis or on the second pivoted lever between the fifth and fourth transverse axis.

DETAILED DESCRIPTION

FIG. 1shows an embodiment of the automobile seat2according to the invention, which comprises a backrest4and a seat portion6. The seat direction of the automobile seat2is indicated by means of the arrow8in the figures. The seat portion6is fastened to the backrest4with a rear section in the direction opposite to the seat direction8so that it is pivotable about a first transverse axis10, the first transverse axis10being covered inFIG. 1but it can be seen inFIG. 2toFIG. 5. The backrest4may be pivoted forward in the direction of the seat portion6about a second transverse axis12. At the same time, the backrest4is divided into an upper section14and a lower section16in relation to its longitudinal direction. While the upper section14extends from the second transverse axis12, the lower section16is located after the second transverse axis12. The seat portion6is thereby fastened at the end of the lower section16so that it is pivotable about the first transverse axis10.

In order to be able to pivot the automobile seat2, a four-link backrest pivoting mechanism18and two-link seat portion pivoting mechanism20are provided. The two pivoting mechanisms18,20can each be disposed on both sides of the automobile seat2, wherein only the left side of the automobile seat2will be described here and this description applies similarly to the right side of the automobile seat2.

As has already been indicated, the backrest4is fastened to the four-link backrest pivoting mechanism18so that it is pivotable about the second transverse axis12. The four-link backrest pivoting mechanism18initially comprises a first pivoted lever22. The first pivoted lever22is fastened to the backrest4so that it is pivotable about the second transverse axis12on the one hand and is fastened to the supporting device26so that it is pivotable about a third transverse axis24. The supporting device26may, for example, comprise a vehicle floor and/or a vehicle seat substructure on which corresponding fastening parts28are provided, which allow a pivotable fastening of the first pivoted lever22on the supporting device26. The four-link backrest pivoting mechanism18further comprises a second pivoted lever30, which is fastened to the fastening part28of the supporting device26so that it is pivotable about a fourth transverse axis32on the one hand and is fastened to the backrest4so that it is pivotable about a fifth transverse axis34on the other hand.

If the four-link backrest pivoting mechanism18is viewed in the transverse direction, i.e., from the side as inFIG. 1, the distance a between the second transverse axis12and the fifth transverse axis34is configured to be shorter than the distance b between the third transverse axis24and the fourth transverse axis32in order to allow a particularly extensive pivoting of the backrest4, as will be explained in detail subsequently. On the other hand, the distance c between the second transverse axis12and the third transverse axis24corresponds to the distance d between the fourth transverse axis32and the fifth transverse axis34, i.e. it holds that c=d so that the same components can be used for the first and second pivoted levers22,30. Furthermore, the third transverse axis24is disposed at a height h1on the fastening part28while the fourth transverse axis32is disposed at a height h2on the fastening part28of the supporting device26, where h1is greater than h2. The fourth transverse axis32is also located behind the third transverse axis24in the direction opposite to the seat direction8.

The four-link backrest pivoting mechanism18thus forms a four-bar linkage whose corners are formed by the second, third, fourth, and fifth transverse axes12,24,32,34. Such a four-bar linkage ensures a particularly high stability or a particularly stable support of the backrest4as well as a particularly advantageous pivoting of the same about the transverse axis12, as will be explained subsequently with reference toFIG. 1toFIG. 5.

The two-link seat portion pivoting mechanism20has a third pivoted lever36which is fastened to the seat portion6so that it is pivotable about a sixth transverse axis38on the one hand and which is fastened to the fastening part28of the supporting device26so that it is pivotable about a seventh transverse axis40on the other hand. Both the seventh transverse axis40of the two-link seat portion pivoting mechanism20and also the third and fourth transverse axis24,34of the four-link backrest pivoting mechanism18are disposed immovably with respect to the supporting device26.

The mode of operation as well as further features of the automobile seat2will be described hereinafter with reference toFIG. 1toFIG. 5.

FIG. 1shows the backrest4in a substantially upright usage position. The backrest4is supported on the supporting device26via a four-link backrest pivoting mechanism18. The seat portion6is fastened with its rear section to the lower section16of the backrest and is supported with its front section on the supporting device26via the two-link seat portion pivoting mechanism20. In this first position of the seat portion6, the seat portion6is inclined with respect to a horizontal42, the seat portion6being downwardly inclined in the direction opposite the seat direction8. In the first position of the seat portion6, the third pivoted lever26is inclined forward in the seat direction8with respect to a vertical44.

If the automobile seat2should not be required for a vehicle occupant, the backrest4can be pivoted from the usage position shown inFIG. 1about the second transverse axis12via intermediate positions shown inFIG. 2toFIG. 4forward in the seat direction8into the nonusage position shown inFIG. 5. The four-link backrest pivoting mechanism18is thereby configured in such a manner that the second transverse axis12is displaced downward and backward by pivoting the backrest4about this second transverse axis12into the nonusage position, as is indicated by means of the arrows46or48. Furthermore, the seat portion6is displaced backward as a result of the fastening to the backrest4, which may be attributed on the one hand to the pure pivoting movement of the backrest4about the second transverse axis12and on the other hand, to the back displacement of the backrest4in the direction opposite the seat direction8.

During the withdrawal of the seat portion6into the second position shown inFIG. 5, the third pivoted lever36further pivots about the transverse axes38and40so that in the second position of the seat portion6, this is backwardly inclined with respect to the vertical44in the direction opposite the seat direction8. A lowering of the seat portion6compared with the first position inFIG. 1is effected both due to the backward pivoting movement of the third pivoted lever36and also due to the lowering of the backrest4into the nonusage position. The four-link backrest pivoting mechanism18and the two-link seat portion pivoting mechanism20are thereby coordinated with one another in such a manner that in the second position the seat portion6is disposed in the horizontal42.

As can be seen fromFIG. 1toFIG. 5, a headrest50is further provided at the upper end of the backrest4, this being pivotable about a pivot axis52. The pivot axis5extends transverse to the seat direction8, whereby in the nonusage position of the backrest4the headrest50may be folded forward about the pivot axis52by at least 90°, as shown inFIG. 5. In this position, the headrest no longer takes up as much space in the seat direction8. This extensive folding of the headrest50is made possible by the seat portion6being displaced toward the rear in the nonusage position of the backrest8.

In an advantageous alternative embodiment (not shown), the first transverse axis10may also be fastened to the four-link backrest pivoting mechanism18without needing to be fastened to the backrest4. Thus, the first transverse axis10of the seat portion6could, for example, be fastened to one of the two pivoted levers22,30. In this case, the first transverse axis10is preferably disposed on the second pivoted lever30between the fifth and fourth transverse axes34,32. The first transverse axis10could also correspond to the fifth transverse axis34.