Vehicle seat with seating part

Abstract

The utility model relates to a vehicle seat (2) having a seating part (4) which has a base part (5) and a seating support (13) and which can be adjusted from a normal position into an inclined lying position, the inclination of the seating support (13) relative to the base part (5) being adjustable by means of an adjusting mechanism (16), the adjustment mechanism (16) has an adjustment drive (24) with an adjustment lever (26) and a toggle lever (18) with two lever arms (20) connected to each other by a hinge (22), and the adjustment lever (26) acts in the region of the hinge (22) to adjust the lever arms (20). In this way, a design is achieved which is low in material consumption, in particular also collision-safe.

Description

Technical Field

[0001] This invention relates to a vehicle seat and an adjustment mechanism for the vehicle seat. Specifically, the invention relates to a vehicle seat adjustable from a normal position to a reclined, relaxed, or supine position. Background Technology

[0002] Vehicle seats, especially those in passenger vehicles, typically consist of a seating section and a backrest that is adjustable relative to the seating section. The seating section generally has a seat support area on which a seat cushion is usually mounted. When adjusted to a reclining position, in addition to adjusting the backrest's tilt, the tilt of the seating section is also adjusted, particularly by raising the front area of ​​the seating section, thus adjusting its tilt. Here, the tilt of the seating section is typically adjusted by more than 10°. The normal positioning corresponds to an upright sitting posture.

[0003] For tilt adjustment, the seating section has a base, to which the seating support is fastened by a hinge mechanism and can be tilted relative to the base. The base can typically also be height-adjustable. The vehicle seat is at least indirectly connected to the vehicle body.

[0004] For tilt adjustment, an adjustment mechanism with an adjustment drive device is provided. This adjustment drive device can be configured as a screw drive device and the screw acts on the adjustment mechanism.

[0005] During adjustment, it is sometimes necessary to transmit significant forces. Furthermore, the adjustment mechanism as a whole must be constructed to be collision-safe. These two requirements necessitate that the adjustment mechanism be constructed, depending on the design, to be extremely robust and complex. Summary of the Invention

[0006] Therefore, the objective of this invention is to provide a vehicle seat that can be adjusted between a normal position and a reclining position, and an adjustment mechanism for such a vehicle seat, wherein a large force can be absorbed with less material.

[0007] According to the invention, this task is solved by a vehicle seat having a seating portion having a base portion and a seating support portion hinged thereon by a hinge mechanism, wherein the seating portion extends from the front side toward the rear side of the backrest side and can be adjusted from a normal position to a reclining position. For this purpose, the tilt of the seating support portion relative to the base portion can be adjusted by means of an adjustment mechanism. The front side of the seating support portion is positioned higher in the reclining position and lower in the normal position. The adjustment mechanism includes an adjustment drive with an adjustment lever and an elbow with two lever arms connected to each other by hinges. One lever arm is hinged to the seating support portion, particularly at its end, while the other lever arm is hinged to the base portion, particularly at its end. The adjustment lever acts within the hinge area, and preferably directly on the hinge, to adjust the lever arm and thus the elbow. The point of application for force transmission is, for example, the hinge axis of the hinge. For adjustment, the angle between the two lever arms is thus changed, thereby adjusting the seating support portion relative to the base portion, particularly lifting the front side of the seating portion, thereby adjusting the overall tilt.

[0008] Furthermore, according to the invention, this objective is also achieved through such an adjustment mechanism for a vehicle seat. The advantages and preferred designs listed below can also be applied to the adjustment mechanism in a similar manner.

[0009] A particular advantage of the described adjustment mechanism is that, due to the lever mechanism with an elbow, the adjustment force to be applied is small, and on the other hand, the load, for example, in the event of a collision, is at least partially absorbed by the lever mechanism, for example, introduced into the base section and then into the vehicle body, thereby at least to a large extent reducing the load on the adjustment drive.

[0010] Because this reduces the load on the adjustment drive and adjustment rod, they can be constructed with less material consumption while maintaining higher collision safety, which also leads to cost savings.

[0011] Another advantage of the lever mechanism is that the adjustment movement required to shift the seating position from a normal to a reclining position, and thus the adjustment lever, can be performed with a shorter length. This also keeps the load on the adjustment lever relatively low, and it can, for example, be constructed with a smaller diameter.

[0012] When adjusted to the supine position, the front of the seating section, especially the front of the seating support, is typically raised. As a result, the front of the seating support is adjusted from a lower position in the normal position (especially the lowest final position) to an upper position in the supine position (especially the highest final position).

[0013] In a preferred design, the elbow lever is oriented forward using two arms, and the adjustment drive is positioned rearward behind the elbow lever. This achieves a compact and advantageous arrangement regarding the force applied to the lever.

[0014] In a preferred design, the adjusting rod is extended in the normal position compared to the supine position. Specifically, the adjusting rod extends to its maximum extension stroke in the lowest final position. Conversely, the adjusting rod is retracted in the supine position compared to the normal position, and particularly, retracted to its maximum in the highest final position. Currently, extension and retraction are understood specifically as the distance between the connection point of the adjusting rod and the elbow lever and the support point of the adjusting rod constructed on the adjusting drive mechanism. Thus, in the retracted state, the connection point and the support point are arranged with minimal distance. This design, with its maximum extension stroke in the normal position and minimum extension stroke in the supine position, achieves a smaller load on the adjusting rod. In particular, this results in (e.g., in the event of a collision or under normal load) in the supine position under load, when the force compresses the seat support downwards and then towards the normal position, only tensile forces act on the adjusting rod; these tensile forces (compared to compressive forces) are more easily absorbed, and thus a smaller rod diameter can be achieved.

[0015] In the improved design that achieves the desired effect, the elbow lever can be moved from a folded position in the normal positioning to an extended position in the supine positioning by means of an adjustment drive, and the movement is correspondingly adjusted during adjustment. That is, the angle between the two lever arms increases progressively from the normal positioning to the supine positioning. With this design (where the elbow lever is in the extended position in the supine positioning), at least a majority of the potential load is intercepted and transferred through the extended, and preferably at least largely flush-oriented, lever arms, without subjecting the adjustment drive and, in particular, the adjustment lever to excessive load.

[0016] In the extended position (i.e., especially in the maximum extension position and even more so in the final position for the supine position), the two lever arms are preferably oriented at an obtuse angle and preferably at an angle between each other in the range of 150° to 180°. Here, the included angle is understood as the angle between the two lever arms on the side toward which they are oriented towards the adjustment drive.

[0017] Alternatively, an angle greater than 180° can be set when necessary. Especially in this design (i.e., an angle greater than 180°), however, in smaller angles, in a preferred variation, end stops are constructed on or for the arm of the elbow lever, which limit and define the final posture. At least one end stop is provided to limit the final posture of at least one arm.

[0018] In the folded position, especially in the lowest final position and even more so in the final position for normal positioning, the included angle is preferably in the range of 60° to 90°.

[0019] In the intended design, to adjust the elbow lever from its normal position to a supine position, specifically from a folded position to an extended position, a pulling force is applied (only) by the adjusting rod. Thus, during adjustment, the load on the adjusting rod is small, or the pulling force can be transmitted using a smaller rod diameter and thus less material consumption. This also means that, in the event of loads, such as those caused by a collision (where the force occurs in the opposite direction to the supine position), the same (only) pulling force is applied to the adjusting rod.

[0020] In a preferred improvement, the hinge connecting the two lever arms is centrally located. This is understood to mean that the lengths of the two lever arms from the hinge to their respective fastening points on the seating support or base are the same or at least approximately the same. At least approximately the same length is understood to mean that the length difference relative to the longer lever arm is at most 20% or at most 10%.

[0021] In a preferred improvement, two elbows spaced apart from each other are provided, wherein the arms of the two elbows are more preferably connected by at least one crossbeam. In particular, the crossbeam connects the two upper arms of the two elbows and is mounted on the seating support, especially at their hinge points. Alternatively or supplementarily, the crossbeam connects the two lower arms and is mounted on the base, especially at their hinge points.

[0022] The adjustment drive is preferably configured as a screw drive with a screw serving as an adjusting rod. Such a screw drive is particularly robust and therefore especially suitable. Alternatively, the adjustment drive is configured as a pinion drive. In this case, a rack is typically driven by a pinion. In this case, the rack is the adjusting rod.

[0023] In a manner appropriate to the purpose, only a single adjustment drive is provided, which is preferably fastened to the seating portion on the edge side. Alternatively, the adjustment drive is also located in the middle region, thus spaced apart from the edge side and particularly centrally positioned between the opposing side walls of the seating portion.

[0024] Preferably, the two elbow levers are positioned opposite each other and preferably located on the edge side of the seating portion. The adjustment drive preferably acts only on the elbow levers. This achieves a stable adjustment mechanism with relatively low overall operating costs. Attached Figure Description

[0025] An embodiment of the invention is further described below with reference to the accompanying drawings. Wherein:

[0026] Figure 1 A partial perspective view shows the seating portion of the vehicle seat in its normal position, from which the seating portion can be adjusted to a reclining position.

[0027] Figure 2 This is an enlarged view of the area in front of the seating section, where an adjustment mechanism is located, with the seating section in its normal position.

[0028] Figure 3 like Figure 2 As shown, however, the seating section is in a reclining position. Detailed Implementation

[0029] The vehicle seat 2, shown only partially in the figure, typically has a backrest (not shown) and a seating portion 4, which in... Figure 1 The seat is shown without a cushion. The seating section extends from the front side 6 toward the rear side 8 on the backrest side. The backrest section, not shown here, is securely fastened to the rear side 8 with adjustable tilt.

[0030] The seating portion 4 has a base portion 5, which in this embodiment has a lower base portion 10 and an upper base portion 12, connected to each other by a hinge mechanism. In this embodiment, two support rods 14 are hingedly mounted on opposite side walls of the lower portion 10, respectively, and are connected to the upper portion 12. The support rods 14 achieve a hinged mechanical connection between the upper base portion 12 and the lower base portion 10, allowing for height adjustment of the upper base portion 12 relative to the lower base portion 10.

[0031] In addition, the seating section 4 also has a seating support 13, which is generally also constructed in a basin shape and can therefore be called a seat basin. This seating support is arranged above the upper base section 12 and is generally fastened to the upper base section 12. A seat cushion (not shown) is also installed on the seating support 13.

[0032] Passenger section 4 can be accessed from Figure 1 The normal positioning is adjusted to a reclining position with an incline. For this purpose, the seat support 13 is raised at the front 6 relative to the base portion 5 (especially relative to the upper base portion 12), so that the upper side of the seat portion 4, and consequently the seat support 13, is oriented downwards towards the rear 8. The incline of the seat support 13 is typically adjusted by more than 10° during the transition from the normal positioning to the reclining position (i.e., between the two final positions), and in a range of, for example, 15° to 25°, which is particularly evident from… Figure 2 and Figure 3 This can be seen from the comparison.

[0033] To adjust the tilt, an adjustment mechanism 16 is provided, which has at least one elbow 18 with two arms 20 hinged together by a hinge 22 arranged approximately centrally. The lower arm 20, oriented towards the lower portion 10, is correspondingly hinged at its end to the base portion 5 (particularly the upper base portion 12), and the upper arm 20, oriented towards the seating support portion 13, is hinged at its end to the seating support portion 13. In this embodiment, the two upper arms 20 act on a common crossbeam. The two lower arms 20 act on the sidewalls.

[0034] The adjustment mechanism 16 also includes an electrically adjustable drive 24, which is designed as a screw drive. This screw drive has an adjusting rod 26, which in this embodiment is formed by a screw. It acts on the hinge 22 to transmit the adjusting force.

[0035] The elbow 18 is oriented towards the front 6, and the adjustment drive 24 is connected to the elbow 18 towards the rear 8.

[0036] The two arms 20 of the lever 18 form an angle α between them. This angle is defined as the angle between the two arms 20 on the side of the arm 20 that is oriented toward the adjustment drive 24.

[0037] Now combine Figure 2 and Figure 3 The tilt adjustment will be further explained. Figure 2 The seating section 4 is shown in its normal position, with the seating support 13 in its lowest position. In the normal position, the elbow lever is folded up and the included angle α is preferably an acute angle, for example, in the range of 60° to 90°. Based on this design, the adjusting lever 26 is in its maximum extended stroke position.

[0038] In order to adjust to Figure 3 The supine position shown is now adjusted by means of the drive mechanism 24 to extend the elbow lever 18, thereby transferring it to the supine position. Figure 2 The final extended position is shown. To this end, adjusting rod 26 retracts. Here, a pulling force is applied to hinge 22, thereby moving both lever arms 20 to the extended position. In this extended position, the included angle α is slightly less than 180° in this embodiment, for example, in the range of 160° to 170°. Typically, in the extended position, the included angle α is generally an obtuse angle.

[0039] In summary, the tilt adjustment of the seating portion 2 (especially the seating support portion 13) relative to the base portion 5 is thus defined by the illustrated elbow lever kinematics. In the normal position, i.e., at the lowest tilt angle, the adjusting lever 26 is fully extended, and the elbow lever 18 is in its folded position, where it is folded forward towards the front 6. To increase the tilt angle, the adjusting lever 26 is retracted until the elbow lever 18 reaches its extended position in the highest tilt angle position.

[0040] This special design scheme described herein has several advantages:

[0041] - During adjustment and in the event of a collision, only the pulling force is applied to the adjusting rod 26.

[0042] - Because the adjusting lever 26 retracts to its maximum extent in the highest tilt position, it is subjected to less load, for example, when a load force or impact force is applied.

[0043] Because the elbow 18 is in an extended position in the supine position, at least most of the load or impact force is applied directly to the arm 20 and only a very small portion is applied to the adjusting rod 26, and this is only a tensile load.

[0044] Even in normal positioning, the load or impact force will only apply a tensile load to the adjusting rod 26.

[0045] -Because the adjusting rod 26 is under tension when adjusted to the supine position, a larger adjustment angle and thus a longer adjustment stroke can be achieved without any problems.

[0046] -Due to the tensile load, the diameter of the adjusting rod 26 can be kept relatively small, especially compared to the compressive load.

[0047] Therefore, it is possible to construct the entire adjustment mechanism 16 in a lightweight manner, and the adjustment drive device 24 can also be constructed for smaller loads, requiring less electrical power for the electric drive device. This maintains a small overall structural size.

[0048] List of reference numerals

[0049] 2 vehicle seats

[0050] 4. Passenger section

[0051] 5 Basic Parts

[0052] 6 front side

[0053] 8 rear side

[0054] 10 Basic Section

[0055] 12 Basic Part

[0056] 13. Passenger support section

[0057] 14 support rods

[0058] 16. Adjustment mechanism

[0059] 18 Elbow bar

[0060] 20 levers

[0061] 22 Hinges

[0062] 24. Adjust the drive unit

[0063] 26 Adjustment lever

[0064] A included angle

Claims

1. A vehicle seat (2) having a seating portion (4), the seating portion having a base portion (5) and a seating support portion (13) and extending from the front side (6) toward the rear side (8) of the backrest side, and the seating portion being adjustable from a normal position to a reclining position, wherein, For this purpose, the tilt of the seating support (13) relative to the base part (5) can be adjusted by means of the adjustment mechanism (16), and the front side (6) of the seating support (13) is positioned higher in the supine position. The adjustment mechanism (16) includes an adjustment drive device (24) with an adjustment rod (26) and an elbow (18) with two lever arms (20) connected to each other by hinges (22). One lever arm (20) is hinged to the seating support (13), and the other lever arm (20) is hinged to the base part (5). The adjustment rod (26) acts within the area of ​​the hinge (22) to adjust the lever arm (20).

2. The vehicle seat (2) according to claim 1, wherein, The elbow (18) is oriented forward (6), and the adjustment drive (24) is arranged behind the elbow (18) in a rearward (8) direction.

3. The vehicle seat (2) according to claim 1 or 2, wherein, The adjustment rod (26) is extended in the normal position, compared to the supine position.

4. The vehicle seat (2) according to claim 1 or 2, wherein, The elbow (18) can be moved from the folded position in the normal positioning to the extended position in the supine positioning by means of the adjustment drive device (24).

5. The vehicle seat (2) according to claim 4, wherein, In the extended position, the two arms (20) are oriented at an angle (α) of 150° to 180° to each other.

6. The vehicle seat (2) according to claim 4, wherein, In the folded position, the two arms (20) are oriented at an angle (α) between each other in the range of 60° to 90°.

7. The vehicle seat (2) according to claim 5, wherein, In the folded position, the two arms (20) are oriented at an angle (α) between each other in the range of 60° to 90°.

8. The vehicle seat (2) according to claim 1 or 2, wherein, At least one end stop is constructed on or for the lever arm (20), thereby limiting the final posture of at least one of the lever arms (20).

9. The vehicle seat (2) according to claim 8, wherein, The structure has multiple end stops, and the lever arm (20) is arranged in the extended position at an angle (α) greater than 180°.

10. The vehicle seat (2) according to claim 1 or 2, wherein, In order to adjust the elbow bar (18) from the normal position to the supine position, a pulling force is applied by the adjusting rod (26).

11. The vehicle seat (2) according to claim 1 or 2, wherein, The hinge (22) is centrally located on the elbow (18).

12. The vehicle seat (2) according to claim 1 or 2, wherein, The adjustment drive device (24) is configured as a screw drive device having a screw as an adjustment rod (26).

13. The vehicle seat (2) according to claim 1 or 2, wherein, The adjustment drive device (24) is arranged on the edge side of the seating part (4).

14. The vehicle seat (2) according to claim 1, wherein, - The elbow (18) is oriented forward (6), and the adjustment drive device (24) is arranged behind the elbow (18) in a rearward (8) direction. -In the normal positioning, the adjustment rod (26) is extended compared to the supine positioning. - The elbow (18) can be moved from the folded position in the normal positioning to the extended position in the supine positioning by means of the adjustment drive device (24). - In the extended position, the two arms (20) are oriented at an angle (α) of 150° to 180° relative to each other. -In the folded position, the two arms (20) are oriented at an angle (α) between each other in the range of 60° to 90°. - At least one end stop is constructed on or for the lever arm (20), thereby limiting the final attitude of at least one of the lever arms (20). - In order to adjust the elbow lever (18) from the normal position to the supine position, a pulling force is applied by the adjusting lever (26). -The hinge (22) is centrally located on the elbow (18). - The adjustment drive device (24) is configured as a screw drive device having a screw as an adjustment rod (26).

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