Motor vehicle seat and motor vehicle

Abstract

The invention relates to a motor vehicle seat (1) with a seat part (3) and a backrest (5) that can be pivoted forwards and locked via a locking device (4), wherein a release device (6) is provided for releasing the locking device (4). The essential feature of the invention is that the release device (6) has a grippable release loop (7) which is connected to a Bowden cable (9) via a transmission lever (8), the Bowden cable (9) in turn being connected to the locking device (4) in a force-transmitting manner. This makes it easier to overcome a breakaway torque, especially when the locking device (4) is in place.

Description

[0001] The present invention relates to a motor vehicle seat with a seat part and a backrest that can be pivoted forward and locked via a locking device, wherein a release device is provided for releasing the locking device, according to the preamble of claim 1. The invention also relates to a motor vehicle with such a motor vehicle seat.

[0002] From DE 10 2004 038 457 B4, a transmission device for adjusting a vehicle seat is known, which is suitable for converting a linear drive motion into a rotary output motion. The transmission device has at least one lever connected to the output shaft and extending radially relative to it, the free end of which is in operative contact with an inclined surface that can be oriented substantially linearly in the direction of the output shaft. This is intended to allow, in particular, the output torque and output speed to be easily varied during the course of the movement.

[0003] From EP 2 337 705 B1, a locking device for a vehicle seat is known, comprising a locking cam rotatable about a first axis of rotation and a locking pawl rotatable about a second axis of rotation, wherein the locking device is adjustable into a locking position and a release position. The locking cam has a first control area and a first safety area and is formed in one piece. Furthermore, the locking pawl has a second locking area and a second safety area, wherein, in the locking position of the locking device, the first and second control areas are in contact with each other, and the first and second safety areas are opposite each other or in contact with each other. This is intended to provide, in a cost-effective manner, effective protection against unintentional or unsecured opening movements.

[0004] From EP 2 144 783 A1 a vehicle seat with a seat part and a backrest with a fitting for adjusting the tilt of the backrest relative to the seat part is known.

[0005] From DE 10 2006 044 490 B4 a fitting for a vehicle seat is known, comprising a first fitting part and a second fitting part operatively connected to it via a gear connection, as well as a rotatably mounted eccentric driven by a driver for driving a relative rolling movement of the first and second fitting parts.

[0006] From DE 100 18 125 A1, a hinge fitting for a vehicle seat is known, comprising a lower fitting part and an upper fitting part that is rotatable relative to the lower fitting part for attaching the backrest of the vehicle seat. The backrest can be pivoted by means of the hinge fitting between at least one upright sitting position, which can be locked by means of the hinge fitting, and a flat table position and / or reclining position, which can be secured by means of the hinge fitting. Furthermore, a control cam is provided on one of the two fitting parts, which interacts with a control element of the other fitting part to control the locking and / or securing by the hinge fitting.

[0007] From DE 44 39 644 C2 a locking system for fittings of vehicle seats with freely swiveling backrests is known.

[0008] From DE 103 42 832 B4, a motor vehicle seat is known, comprising a seat section and a backrest, as well as a lower section fixed to the seat section structure and an upper section rotatable relative to this lower section for adjusting the backrest's inclination. A backrest-structure-fixed adapter element can be locked to the upper section via a locking device and unlocked to pivot the backrest between a forward-folding position and an upright position. The locking device has a locking element pivotably mounted on an eccentric element on the adapter element. In the locked state of the adapter element, the locking element engages with the upper section via an engagement section. The rotational position of the eccentric element can be adjusted for backlash-free locking, with the eccentric element bearing against the upper section with a contact surface in the backlash-free locked state.This is intended to create a simple design that allows for backlash-free locking.

[0009] Especially in two-door vehicles, to access the rear seats, the backrests of the front seats must be folded forward. This requires releasing a locking mechanism on the backrest, which is usually accomplished with a release lever or a pull strap.

[0010] Particularly during extended driving on uneven roads, the locking mechanism that holds the backrest securely to a seat component can become stuck. This makes it difficult to release the locking lever or loop, thus requiring considerable force to release the backrest. A typical release force is approximately 50 N, but this can increase significantly when the locking mechanism is stuck, making it extremely difficult to apply.

[0011] The present invention therefore deals with the problem of providing an improved or at least an alternative embodiment for a motor vehicle seat of the generic type, by means of which in particular the disadvantages known from the prior art can be overcome.

[0012] This problem is solved according to the invention by the subject matter of independent claim 1. Advantageous embodiments are the subject matter of the dependent claims.

[0013] The present invention is based on the general concept of overcoming a breakaway torque in the locking mechanism of a lockable backrest more easily by connecting a release loop to the locking mechanism via a lever mechanism. This allows the release loop to exert a significantly higher leverage force on a Bowden cable connected to a tensioning cam of the locking mechanism when the locking mechanism is released, thus making the unlocking process considerably easier. This offers a particular advantage when the vehicle has been driven for an extended period, for example, over uneven roads, and the locking mechanism has become stuck. The vehicle seat comprises a seat section and a backrest that pivots forward and can be locked via the aforementioned locking mechanism. A release device is provided for releasing this locking mechanism.This release mechanism features a manually accessible release loop or, more generally, a manually accessible release element, which is connected via a transmission lever to a Bowden cable. This cable, in turn, is connected to a clamping cam of the locking device, transmitting force. The transmission lever thus acts as a lever for unlocking the locking device, making it significantly easier to release the device, especially when faced with a higher breakaway torque, such as when the locking device is stuck.

[0014] In an advantageous embodiment of the vehicle seat according to the invention, a pendulum-like connecting lever is arranged between the release loop and the transmission lever. By means of such a pendulum-like connecting lever, a torque-free force transmission between the release loop and the transmission lever can be achieved, thereby effectively preventing jamming.

[0015] Advantageously, the transmission lever is pivotally connected to the connecting lever at one longitudinal end. This reliably prevents any torque from being transmitted from the connecting lever to the transmission lever.

[0016] In a further advantageous embodiment of the vehicle seat according to the invention, the transmission lever is rotatably mounted in an elongated hole of a support via a bearing pin. The Bowden cable is connected to the transmission lever in the longitudinal direction between its first longitudinal end and the bearing pin. The distance between the bearing pin and the Bowden cable is significantly smaller than the distance between the bearing pin and the first longitudinal end of the transmission lever, to which the connecting lever and the release loop are attached. This allows a significantly increased force to be transmitted to the Bowden cable via the transmission lever when the first longitudinal end is pulled, resulting in a simple release of the breakaway torque.

[0017] In a particularly preferred embodiment of the vehicle seat according to the invention, the transmission lever is supported at a second longitudinal end against a stop in a receptacle. This support against the stop causes the transmission lever to rotate at its second longitudinal end, so that when the release loop is pulled, a force is exerted via the connecting lever on the first longitudinal end of the transmission lever, whereupon it rotates about its second longitudinal end against the stop and is supported. By supporting the transmission lever at its second longitudinal end, the leverage exerted on the Bowden cable can be further increased compared to rotating the transmission lever around the pivot pin. This allows a significantly increased force to be exerted on the Bowden cable without increasing the overall release travel.The unlocking path will be slightly longer, but only marginally so and significantly less than would be required with a direct translation.

[0018] In a particularly preferred embodiment of the vehicle seat according to the invention, the tensioning cam interacts with a pawl, the pawl having teeth that, when the backrest is locked, engage positively with a complementary toothing fixed to the seat section. The toothing between the pawl and the seat section ensures reliable locking of the backrest in normal use. Simultaneously, the tensioning cam, i.e., its rotation, causes the pawl to slide along the locking mechanism, whereupon the pawl is rotated and its teeth are pulled out of the toothing fixed to the seat section. As the tensioning cam rotates, it slides along a cam track of the pawl, rotating it into a release position.

[0019] The release loop is functionally made of leather. Leather allows for both the application of high tensile forces and a visually appealing and high-quality appearance.

[0020] In a further advantageous embodiment of the vehicle seat according to the invention, the release loop is connected to a guide slide which is guided in a guide on the backrest side. This enables reliable and, in particular, jam-free pulling of the release loop, while also allowing for easy and smooth retraction of the release loop, for example by means of a return spring arranged on the transmission lever. Such a guide slide also allows for extremely precise movement of the guide slide and thus also of the connected connecting lever.

[0021] The present invention is further based on the general concept of equipping a motor vehicle with a motor vehicle seat in accordance with the preceding paragraphs. This allows the advantages described with regard to the motor vehicle seat according to the invention to also be transferred to the motor vehicle. Specifically, these advantages lie in a significantly simpler overcoming of the breakaway torque when a backrest is folded forward, thereby achieving greater ease of use, particularly in a two-seater sports car where access to the rear bench seat is only possible by folding the backrests of the front seats forward.

[0022] Further important features and advantages of the invention will become apparent from the dependent claims, the drawings and the associated description of the figures based on the drawings.

[0023] It is understood that the features mentioned above and those to be explained below can be used not only in the combinations specified, but also in other combinations or individually, without departing from the scope of the invention as defined by the claims. Components of a higher-level unit, such as a device, apparatus, or arrangement, mentioned above and those to be mentioned below, which are designated separately, can form separate parts or components of this unit or be integral areas or sections of this unit, even if this is depicted differently in the drawing.

[0024] Preferred embodiments of the invention are shown in the drawing and are explained in more detail in the following description, wherein identical reference numerals refer to identical or similar or functionally identical components.

[0025] Each schematically illustrates Fig. 1 a side rear view of a motor vehicle seat according to the invention, Fig. 2 a representation as in Fig. 1, however, when viewed from the rear and without a rear panel, Fig. 3 a sectional view through the motor vehicle seat according to the invention in the area of ​​a transition from a seat part to a backrest, Fig. 4 a detailed illustration of the release device according to the invention with the release loop not pulled, Fig. 5 a representation as in Fig. 4, however, with the release loop slightly pulled, Fig. 6 a representation as in Fig. 5, however, with the release loop fully pulled.

[0026] According to the Fig. 1 - 3 A motor vehicle seat 1 of a motor vehicle 2 according to the invention comprises a seat part 3 and a forward pivotable and locking device 4 (compare Fig. 3) Lockable backrest 5. A release device 6 is provided for releasing the locking device 4 (compare the Fig. 2 and 4-6), which has a graspable release loop 7, which is operated via a translation lever 8 (compare the Fig. 2 and 4-6) is connected to a Bowden cable 9. The Bowden cable 9 in turn is connected to a tension cam 10 (compare Fig. 3) connected to the locking device 4, that is, indirectly connected to the locking device 4. When the release loop 7, which can also generally be designed as a release element, is pulled, the clamping cam 10 is thus released accordingly. Fig. 3 is rotated counterclockwise about an axis 12' and interacts with a pawl which is rotated clockwise about an axis 12 by the rotational movement of the clamping cam 10. The pawl 11 has a toothing 13 which, when the backrest 5 is locked, engages positively with a complementary toothing 13' that is fixed to the seat part.

[0027] A pendulum-like connecting lever 14 is arranged between the release loop 7 and the transmission lever 8. Its articulated connection on both sides to the transmission lever 8 and the release loop 7 ensures torque-free force transmission to the transmission lever 8. The transmission lever 8 is articulated to the connecting lever 14 at a first longitudinal end 15.

[0028] The translation lever 8 is rotatably mounted in a slot 17 of a support 18 via a bearing pin 16. The support 18, in turn, is rigidly coupled to the release loop 7. At a second longitudinal end 19, the translation lever 8 rests against a stop 20 of a receptacle 21.

[0029] When the release loop 7 is pulled, force is transmitted via the connecting lever 14 to the transmission lever 8, whereupon the latter rests with its second longitudinal end 19 against the receiving-side stop 20 and rotates about a virtual axis in the area of ​​the second longitudinal end 19. Due to the connection of the Bowden cable 9 between the first longitudinal end 15, to which the connecting lever 14 is pivotally attached, and the second longitudinal end 19, a lever force can be exerted on the Bowden cable 9 by pulling the connecting lever 14. This force is significantly greater than would be possible with a direct coupling of the release loop 7 to the Bowden cable 9.This makes it easier to overcome a so-called breakaway torque, which has formed in a locking device 4 that has become stuck due to an uneven road surface, thus making it easy and convenient to unlock the locking device 4 even after longer driving and thus potentially larger breakaway torques.

[0030] The release loop 7 can, for example, be made of leather, which not only allows high forces to be transmitted, but also creates a visually appealing appearance and a high-quality feel.

[0031] If one considers the Fig.Further on, from figures 2 and 4 to 6, it can be seen that the release loop 7 is connected to a guide slide 22, which is guided in a guide 23 on the backrest side. This ensures smooth and, in particular, jam-free force transmission from the release loop 7 to the transmission lever 8. The transmission lever 8 is reset, for example, by a spring force that acts, in particular, on the clamping cam 10.

[0032] In summary, the vehicle seat 1 and the vehicle 2 according to the invention enable a significantly easier and therefore much more comfortable release of the locking device 4 by means of the release device 6. This makes it considerably easier to overcome the high breakaway torque that can occur during extended driving over uneven road conditions. This can be further enhanced by the fact that the transmission lever 8, with its second longitudinal end 19, rests against a stop 20 on the receiving side when releasing. This allows the breakaway torque to be overcome more easily using the lever principle, without increasing the overall release travel. While the release travel is slightly longer, it is only marginally longer and significantly shorter than would be required with a direct transmission. Furthermore, the release device 6 allows many previously used components to be reused. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2004 038 457 B4

[0002] EP 2 337 705 B1

[0003] EP 2 144 783 A1

[0004] DE 10 2006 044 490 B4

[0005] DE 100 18 125 A1

[0006] DE 44 39 644 C2

[0007] DE 103 42 832 B4

[0008]

Claims

[1] Motor vehicle seat (1) comprising a seat section (3) and a backrest (5) which can be pivoted forward and locked via a locking device (4), wherein a release device (6) is provided for releasing the locking device (4), characterized by , that the release device (6) has a grippable release loop (7) which is connected via a transmission lever (8) to a Bowden cable (9), wherein the Bowden cable (9) is connected to the locking device (4) in a force-transmitting manner. [2] Motor vehicle seat (1) according to claim 1, characterized by , that a pendulum-like connecting lever (14) is arranged between the release loop (7) and the translation lever (8). [3] Motor vehicle seat (1) according to claim 2, characterized by , that the translation lever (8) is pivotally connected to the connecting lever (14) at a first longitudinal end (15). [4] Motor vehicle seat (1) according to any one of the preceding claims, characterized by, that the translation lever (8) is rotatably mounted in a slot (17) of a support (18) via a bearing bolt (16). [5] Motor vehicle seat (1) according to any one of the preceding claims, characterized by , that the translation lever (8) is supported at a second longitudinal end (19) against a stop (20) of a receptacle (21). [6] Motor vehicle seat (1) according to any one of the preceding claims, characterized by , that the tension cam (10) interacts with a pawl (11), wherein the pawl (11) has a toothing (13) which, when the backrest (5) is locked, engages in a form-fitting manner with a complementary seat-part fixed toothing (13'). [7] Motor vehicle seat (1) according to any one of the preceding claims, characterized by , that the release loop (7) is made of leather. [8] Motor vehicle seat (1) according to any one of the preceding claims, characterized by, that the release loop (7) is connected to a guide carriage (22) which is guided in a backrest-side guide (23). [9] Motor vehicle (2) with a motor vehicle seat (1) according to one of the preceding claims

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