vehicle seat

Abstract

Vehicle seat for a vehicle, comprising a seat upper frame (9) supporting a seat cushion (11) and a seat lower frame (3) that can be connected to the vehicle floor (7) in a force-transmitting manner, wherein a seat height adjustment device (15) is arranged between the seat lower frame (3) and the seat upper frame (9), by means of which the seat upper frame (9) and thus the seat height can be adjusted, wherein a belt buckle holder (21) of a belt buckle (19) is attached to the seat lower frame (3), in which a belt tongue (27) is inserted when the seat belt (23) is fastened, and wherein the belt buckle holder (21) or the belt buckle (19) is movably coupled to the seat upper frame (9) via a coupling unit (35), wherein an angular position (α, β) of the belt buckle (19) is automatically adjusted as a function of the set seat height,that, when the seat belt (23) is fastened, the webbing is located centrally on a running surface of a webbing eyelet (31) of the webbing tongue (27), regardless of the seat height, and wherein the coupling unit (35) has a guide contour (39) formed on the upper seat frame (9) which interacts with a counter contour (37) formed on the buckle holder (21) or buckle (19), and wherein the buckle holder (21) is pivotably articulated to the lower seat frame (3) about a pivot axis (S) oriented in the transverse direction (y) of the vehicle, so that the buckle holder (21) is pivotably mounted in the longitudinal direction (x) of the vehicle, characterized in that a mounting distance (m) between a buckle holder attachment point (33) on the lower seat frame (3) and the buckle (19) is fixed and cannot be varied during seat height adjustment.

Description

[0001] The invention relates to a vehicle seat according to the preamble of claim 1.

[0002] Such a vehicle seat can be implemented as a single seat in the front and rear of a vehicle. The vehicle seat can be attached to the vehicle floor via a rail system to allow for longitudinal adjustment of the vehicle seat. Furthermore, the vehicle seat can have a seat height adjustment device that allows the user to adjust the seat height.

[0003] An exemplary vehicle seat comprises an upper seat frame supporting a seat cushion and a lower seat frame connected to the vehicle floor in a force-transmitting manner. A seat height adjustment device is arranged between the lower seat frame and the upper seat frame, by means of which the upper seat frame and thus the seat height can be adjusted in a vertical direction of the vehicle. A belt buckle holder for a belt buckle is firmly screwed to the lower seat frame. Therefore, in the prior art, the belt buckle remains unchanged in its angular position regardless of the adjusted seat height.

[0004] When the seat belt is fastened, a belt strap tongue is detachably connected to the belt buckle. The seat belt strap is guided through a belt eyelet on the belt strap tongue, with a lap belt section merging into a shoulder belt section of the seat belt at the belt strap tongue. The above-mentioned state of the art presents the following problem: Each vehicle occupant can adjust a different seat height position depending on their height. Shorter people generally sit higher up, while taller people usually sit lower down. Regardless of the seat height setting, the angular position of the belt buckle remains unchanged in the state of the art. This means that the belt buckle, which is firmly screwed to the seat subframe, is positioned differently in relation to the seat height setting and thus to the respective occupant / occupant's iliac crest.The seat height adjustment of the seat upper frame (i.e., the seat surface) from bottom to top (or vice versa) usually follows a parabolic / elliptical motion curve. If the belt buckle is positioned at an unfavorable angle, this can result in the belt webbing no longer being centered on the running surface of a belt webbing eyelet when the seat belt is fastened, but instead slipping into a corner of the eyelet. As a result, the restraining force acting on the belted person can suddenly increase, for example, in the event of a crash. Therefore, in the current state of the art, the belt webbing can already be unstable in the eyelet before a potential crash, resulting in a loss of force balance.

[0005] A motor vehicle seat is known from DE 10 2009 052 581 A1. A vehicle seat with a parallelogram height adjustment mechanism is known from DE 100 18 828 C1. Another motor vehicle seat is known from DE 10 2014 210 623 A1. DE 10 2014 102 886 A1 discloses a generic lock sensor mounted on the seat. A vehicle seat is known from DE 10 2019 123 940 A1.

[0006] The object of the invention is to provide a vehicle seat in which, in comparison to the prior art, it is ensured in a simple manner that when the safety belt is fastened, the belt strap runs perfectly aligned through the belt strap eyelet of the tongue.

[0007] The object is solved by the features of claim 1. Preferred developments of the invention are disclosed in the subclaims.

[0008] The invention is based on a vehicle seat having an upper seat frame supporting a seat cushion and a lower seat frame. The lower seat frame is connected to the vehicle floor in a force-transmitting manner. A seat height adjustment device is arranged between the lower seat frame and the upper seat frame, by means of which the upper seat frame and thus the seat height can be adjusted in a vertical direction of the vehicle. A belt buckle holder of a belt buckle is connected to the lower seat frame, with which a belt webbing tongue is detachably plugged in when the seat belt is fastened. The belt buckle holder is rotatably mounted on the lower seat frame and can advantageously be provided with a torsion bar spring. According to claim 1, the belt buckle holder or the belt buckle is motion-coupled to the upper seat frame via a coupling unit.According to the invention, the movement coupling is designed such that an angular position of the belt buckle is automatically adjusted depending on the set seat height in such a way that when the safety belt is fastened, the belt strap is located centrally on a running surface of a belt strap eyelet of the tongue, regardless of the seat height.

[0009] According to the invention, the coupling unit has a guide contour formed on the seat upper frame, which interacts with a counter-contour formed on the belt buckle holder or buckle. The coupling unit can, for example, be a guide slot in which a guide pin slidably engages a guide slot.

[0010] In a structurally simple embodiment, the belt buckle holder can be designed to be rigid, for example, as a strip-shaped sheet metal holder. The sheet metal holder can, for example, be pivotably attached to the seat subframe. At the opposite end, the sheet metal holder can support the belt buckle in a rigid manner. According to the invention, the mounting distance between the belt buckle holder connection point on the seat subframe and the belt buckle cannot be varied during seat height adjustment.

[0011] According to the invention, the belt buckle holder is pivoted to the seat lower frame about a pivot axis aligned in the transverse direction of the vehicle. This allows the belt buckle holder to follow the movement curve of the seat upper frame without interfering contours during seat height adjustment.

[0012] To ensure a properly functioning movement coupling, it is preferable for the belt buckle holder to interact with a spring element that pre-tensions the belt buckle holder in a pivoting direction toward the front of the vehicle. In this case, the belt buckle holder is permanently pressed into contact with the guide contour formed on the seat upper frame.

[0013] The seat upper frame can be adjusted to any intermediate position between a lower and an upper seating position using the seat height adjustment device. Starting from the lower, rear seating position, the seat upper frame can be adjusted via a seat adjustment panel in a parabolic or elliptical motion curve up to the upper, front seating position.

[0014] In a structurally simple and space-efficient implementation, the spring element can be a torsion bar spring that can be elastically twisted while generating a restoring force. The torsion bar spring can be aligned transversely in the vehicle and attached to the seat base frame with one spring point. The other spring point of the torsion bar spring, however, is connected to the belt buckle holder. In the assembled state, the belt buckle holder is thus permanently pressed into sliding contact with the guide contour formed on the seat upper frame by the restoring force generated by the torsion bar spring.

[0015] The invention is particularly applicable to a three-point safety belt that, when fastened, has a lap belt portion and a shoulder belt portion. The lap belt portion extends in the transverse direction of the vehicle between two attachment points located on the floor on either side of the vehicle seat. The shoulder belt portion extends diagonally across the occupant's thorax area to an upper attachment point. One of the two floor attachment points is formed by the belt buckle and the belt webbing tongue. The lap belt portion merges into the shoulder belt portion in the belt eyelet of the belt webbing tongue.

[0016] For example, the belt buckle holder or the belt buckle in the lower, rear seating position of the vehicle can be in an angular position in which the belt buckle holder is pivoted forward by a first angle from a vehicle vertical axis. In contrast, the belt buckle holder in the upper, front seating position of the vehicle is in an angular position in which it is pivoted forward by a second angle that is an angular dimension greater than the first angle. For example, the belt buckle holder in the lower, rear seating position of the vehicle can assume an angle α of 20°, while the belt buckle holder in the upper, front seating position of the vehicle can assume an angle β of approximately 30°.

[0017] The seat subframe can be connected to the vehicle floor via a rail system for transmitting force. This allows the vehicle seat, including the seat upper frame, seat subframe, and attached seat belt buckle, to be adjusted longitudinally.

[0018] An embodiment of the invention is described below with reference to the attached figures.

[0019] They show: Fig. 1 a vehicle seat in a lower, rear seating position; Fig. 2 in a view corresponding to the Fig. 1 the vehicle seat in an upper, front seating position; and Fig. 3 in a perspective partial view the connection of the belt buckle holder to the vehicle seat.

[0020] In the Fig. 1 shows a vehicle seat of a motor vehicle realized as a single front seat. The arrangement of the vehicle seat in the motor vehicle is defined by the directional specifications x, y, z used below. The vehicle seat has a seat base frame 3, which is mounted via a rail system 5 so as to be adjustable in the vehicle's longitudinal direction x. In addition, the vehicle seat has an upper seat frame 9, which supports a seat cushion 11. A backrest 13 is hinged to the upper seat frame 9. Between the seat base frame 3 and the upper seat frame 9 is a seat height adjustment device 15, by means of which the upper seat frame 9 and thus the seat height can be adjusted by the user in a vehicle vertical direction z. Fig. 1 and Fig. 2, the seat height adjustment device 15 is indicated by way of example by two rockers, which are each pivotably connected to the seat lower frame 3 and the seat upper frame 9 about a pivot axis aligned in the vehicle transverse direction y.

[0021] The vehicle seat is assigned a belt buckle 19, which is rigidly attached to a belt buckle holder 21. The belt buckle holder 21 is implemented as a strip-shaped sheet metal part, which is mounted on the seat subframe 3 at its end opposite the belt buckle 19. The belt buckle 19 is a component of a standard three-point safety belt 23, which is used in the Fig. 1 and Fig. 2 in the fastened state, but without a vehicle occupant. Accordingly, the safety belt 23 has a lap belt portion 25, which extends in the vehicle transverse direction y between a belt tongue 27, which is connected to the belt buckle 19, and a belt attachment point (not shown) on the floor. The safety belt 23 also has a shoulder belt portion 29, which extends diagonally across the occupant's thorax area to an upper attachment point. As can be seen from the Fig. 1 or Fig. 2, the safety belt 23 is guided through a belt eyelet 31 of the tongue 27, with the lap belt portion 25 merging into the shoulder belt portion 29 at the tongue 27.

[0022] In the Fig. 1, the vehicle seat is shown in its rear, lower seating position I. By means of the rockers 15, the seat upper frame 9 can be moved via a seat adjustment field in a parabolic or elliptical movement curve towards the upper, front seating position II ( Fig. 2) can be adjusted.

[0023] The essence of the invention is that the angular position of the belt buckle 19 automatically adjusts depending on the set seat height such that, when the seat belt 23 is fastened, the belt webbing is always centered on a running surface of the belt webbing eyelet 31, regardless of the set seat height. This is achieved by the measures described below: Accordingly, the belt buckle holder 21 is articulated at its seat subframe connection point 33 about a pivot axis S aligned in the vehicle transverse direction y. The belt buckle holder 21 is therefore not rigidly connected to the seat subframe 3, but is pivotally articulated in the vehicle longitudinal direction x. In addition, the belt buckle holder 21 is motion-coupled to the seat upper frame 9 via a link guide 35. The link guide 35 has a link pin 37 fastened to the belt buckle holder 21, which interacts with a corresponding link track 39.The slide track 39 is in the . Fig. 3 is exemplified in a link carrier 41, which is mounted laterally on the seat upper frame 9. As can be seen from the Fig. 3, the connection point 33 of the belt buckle holder 21 on the seat base frame 9 is realized by means of a torsion bar spring 43, which, by building up a restoring force F R is elastically twistable. The torsion bar spring 43 is attached at its outer end to the belt buckle holder 21 and at its inner end to the seat subframe 3. The torsion bar spring 43 is prestressed by a torsional moment M such that the guide pin 37 of the belt buckle holder 21 is permanently pressed against the guide track 39 in sliding contact (i.e., regardless of the seat position I, II).

[0024] The guide track 39 formed in the guide support 41 is designed in such a way that when the seat height is adjusted, the belt buckle holder 21 moves in the following movement curve: Thus, the belt buckle holder 21 takes up the Fig. 1, a steep angle position in which the belt buckle holder 29 is pivoted from a vehicle vertical axis by a first angle α towards the front of the vehicle, which may be, for example, 20°. When the seat height is adjusted to the vehicle-front, upper seating position II ( Fig. 2), the belt buckle holder 31 is pivoted forwards through a second angle β into a flat angular position. The angle β is one angular dimension greater than the first angle α. For example, the belt buckle holder 21 can be pivoted in its flat angular position ( Fig. 2) form an angle β of approximately 30°. List of reference symbols 3 seat subframes 5 rail system 7 Vehicle floor 9 Seat upper frame 11 seat cushions 13 Backrest 15 Seat height adjustment device 19 Belt buckle 21 belt buckle holder 23 Seat belt 25 lap belt portion 27 tongue 29 shoulder strap portion 31 Belt eyelet 33 connection point 35 Scenery guide 37 Link pin 39 Slide track 41 scenery supports S swivel axis m mounting distance M torsional moment

Claims

[1] Vehicle seat for a vehicle, comprising a seat upper frame (9) which supports a seat cushion (11), and a seat lower frame (3) which can be connected to the vehicle floor (7) of the vehicle in a force-transmitting manner, wherein a seat height adjustment device (15) is arranged between the seat lower frame (3) and the seat upper frame (9), by means of which the seat upper frame (9) and thus the seat height can be adjusted, wherein a belt buckle holder (21) of a belt buckle (19) is connected to the seat lower frame (3), into which a belt strap tongue (27) is inserted when the seat belt (23) is fastened, and wherein the belt buckle holder (21) or the belt buckle (19) is coupled in terms of movement to the seat upper frame (9) via a coupling unit (35), wherein an angular position (α, β) of the belt buckle (19) is automatically adjusted as a function of the set seat height in such a way thatthat when the safety belt (23) is fastened, the belt strap is located centrally on a running surface of a belt strap eyelet (31) of the belt strap tongue (27), regardless of the seat height, and wherein the coupling unit (35) has a guide contour (39) formed on the seat upper frame (9), which interacts with a counter-contour (37) formed on the belt buckle holder (21) or belt buckle (19), and wherein the belt buckle holder (21) is pivotally connected to the seat lower frame (3), specifically about a pivot axis (S) aligned in the vehicle transverse direction (y), so that the belt buckle holder (21) is pivotally mounted in the vehicle longitudinal direction (x), , characterized by that a mounting distance (m) between a belt buckle holder connection point (33) on the seat subframe (3) and the belt buckle (19) is fixed in a non-variable manner during a seat height adjustment. [2] Vehicle seat according to claim 1, characterized bythat the belt buckle holder (21) is designed to be rigid, namely as a sheet metal holder. [3] Vehicle seat according to one of the preceding claims, characterized by that the belt buckle holder (21) cooperates with a spring element (43) which pivots the belt buckle holder (21) in a pivoting direction towards the front of the vehicle with a restoring force (F R ) in sliding contact with the guide contour (39) formed on the upper seat frame (9). [4] Vehicle seat according to one of the preceding claims, characterized by that the seat upper frame (9) can be adjusted by means of the seat height adjustment device (15) between a lower seating position (I) and an upper seating position (II) into any intermediate positions, and that the seat upper frame (9) can be adjusted starting from the lower, vehicle-rear seating position (I) via a seat adjustment field in a parabolic or elliptical movement curve in the direction of the upper, vehicle-front seating position (II). [5] Vehicle seat according to claim 3, characterized by that the spring element (43) is a torsion bar spring which, by building up a restoring force (F R ) is elastically twistable, and that the torsion bar spring (43) is aligned in the vehicle transverse direction (y) and / or is fastened to the seat subframe (3), and that the counter contour (37) of the belt buckle holder (21) is provided with the restoring force (F R ) is pressed into sliding contact with the guide contour (39) formed on the upper seat frame (9). [6] Vehicle seat according to one of the preceding claims, characterized bythat the safety belt (23) has a lap belt portion (25) which, when fastened, extends in the vehicle transverse direction (y) between two attachment points arranged on the floor on both sides of the vehicle seat, and has a shoulder belt portion (29) which extends diagonally across an occupant's thorax area up to an upper attachment point, and that one of the floor-side attachment points is realized by the belt buckle (19) and the belt strap tongue (27), and / or that in the belt eyelet (31) of the belt strap tongue (27) the lap belt portion (25) merges into the shoulder belt portion (29). [7] Vehicle seat according to one of the preceding claims, characterized bythat the strip-shaped belt buckle holder (21) is in an angular position in the lower, rear-vehicle seating position (I) in which it is pivoted towards the front of the vehicle by a first angle (α) starting from a vehicle vertical axis, and / or that the belt buckle holder (21) is in an angular position in the upper, front-vehicle seating position (II) in which it is pivoted towards the front of the vehicle by a second angle (β) starting from the vehicle vertical axis, which is an angular dimension greater than the first angle (α). [8] Vehicle seat according to one of the preceding claims, characterized by that the seat subframe (3) is connected to the vehicle floor (7) via a rail system (5), so that the vehicle seat together with the seat upper frame (9), seat subframe (3) and belt buckle (19) can be adjusted in the vehicle longitudinal direction (x).

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