FITTING SYSTEM FOR A VEHICLE SEAT

Abstract

A fitting system for a vehicle seat, in particular for a motor vehicle seat, with an axially extending shaft, which is rotatable in the circumferential direction, with at least one fitting which is provided with a rotatably supported driver which is axially secured by a securing element, for driving or for unlocking the fitting, wherein the shaft cooperates with the driver in the circumferential direction in a rotationally secure manner or mechanically connected, in order to rotate the driver, and with at least one quick fastener which is seated on the shaft in an axially non-displaceable manner, in order to secure the cooperation of shaft and driver axially in at least one direction, has the quick fastener connected with the driver and/or with its securing element.

Description

The invention relates to a fitting system for a vehicle seat having the features of the preamble of claim 1.

A fitting system of this type is known from DE 103 52 630 B4. In one of the two fittings, the shaft bears with a boss against the inside of the fitting, while a quick-fastener which is pushed on the shaft, bears against the outside of the fitting. The shaft is thus non-displaceable relative to the fitting.

The object of the invention is to improve a fitting system of the type mentioned in the introduction, in particular to avoid special transformations of the shaft. This object is achieved according to the invention by a fitting system having the features of claim 1. Advantageous configurations are the subject-matter of the subordinate claims.

The quick fastener on the one hand and the driver and/or its securing element on the other hand are separate components (separately configured components). They therefore can be composed of different materials, for example of spring steel on the one hand and of plastics material on the other hand, so that the respectively most favorable properties of the different materials are combined.

By the quick fastener being connected with the driver and/or with its securing element, an axial securing of the shaft in both axial directions is obtained, without particular transformations of the shaft being necessary. In one direction, the quick fastener acts as axial safeguard of the shaft due to its bearing against the fitting, in the opposite direction due to its connection with the driver or with the securing element thereof. The quick fastener consequently secures the cooperation of shaft and driver axially in both directions. With which of the two components the quick fastener is connected directly depends on the orientation of the driver or of the fitting. With both orientations, the quick fastener is connected indirectly with the driver.

Since, in the circumferential direction, the shaft and the driver are connected so as to be rotationally secure or are mechanically connected with a free travel, the connection between the quick fastener and the driver or the securing element thereof can be configured simply. Axially protruding fingers for a form-fitting cooperation by means of hooks, in particular lugs for clipping, are suitable, for example. Other, preferably self-closing connection possibilities can, however, be selected, too. The time for fitting the quick fasteners virtually does not change because of this.

The invention can be used with both, gear fittings and detent fittings. It can be used as a backrest adjusting mechanism of a vehicle seat or also on other sites of the vehicle seat. The quick fastener can cooperate also with an assembly other than a fitting.

The invention is explained in more detail hereinafter with reference to an exemplary embodiment shown in the drawings, in which:

FIG. 1 shows a perspective view of the exemplary embodiment before the quick fastener is mounted,

FIG. 2 shows a perspective view of the quick fastener,

FIG. 3 shows a perspective view of the exemplary embodiment after the quick fastener has been fitted,

FIG. 4 shows a top view of the quick fastener,

FIG. 5 shows a cut through the quick fastener along the line V-V in FIG. 4, and

FIG. 6 shows a schematic view of a vehicle seat.

A vehicle seat 1 for a motor vehicle has a seat part 3 and a backrest 4, the inclination of which is adjustable relative to the seat part 3. In order to adjust the inclination of the backrest 4, a shaft 7, which is arranged horizontally in the transition region between the seat part 3 and the backrest 4, is rotated manually, for example, by means of a handwheel 5, or in a motor-driven manner, for example by means of an electrical motor. On both sides of the vehicle seat 1, the shaft 7 engages in a fitting 10 so that it is rotationally secure. The shaft 7 defines the adopted directional data of a cylinder coordinate system. The shaft 7 and the two fitting 10 are components of a fitting system for adjusting the inclination of the backrest 4.

Each fitting 10 has a first fitting part 11 and a second fitting part 12 which are rotatable relative to one another. With the mounting of the fitting 10, one of the two fitting parts 11 and 12 is assigned to the backrest 4 and connected with the structure thereof, while the other of the two fitting parts 11 and 12 is assigned to the seat part 3 and fixedly connected with the structure thereof. The relative rotation of the two fitting parts 11 and 12 causes the adjustment of the inclination of the backrest 4.

A driver 21 is rotatably supported in the center of the fitting 10. The driver 21 is provided centrally with a bore for receiving the shaft 7. The profile of the bore matches the profile of the shaft 7, in the present case a splined shaft profile. The shaft 7 and the driver are preferably coupled so as to be rotationally secure. However, in the circumferential direction, a free travel can also be provided, so that the shaft 7 and the driver 21 are coupled by driving. The driver 21 preferably has a covering disc or a flange on the one side, by means of which it bears against one of the two fitting parts 11 and 12 on the outside, on the outside of the other of the two fitting parts 11 and 12 being axially secured by a—for example ring-shaped, preferably clipped-on—securing element 43. With respect to the further inner structure of the fitting 10, two basic types are conceivable.

According to a first basic type, the fitting 10 is configured as a geared fitting, in which the first fitting part 11 and the second fitting part 12 are connected with each other by means of a gear unit for displacement and fixing in position, to be more precise, by means of an eccentric epicyclic gear system, which in the present case is self-locking as described, for example, in DE 44 36 101 A1, the relevant disclosure of which is expressly incorporated herein. In order to form the gear unit, an externally toothed wheel is formed on the second fitting part 12, and an internally toothed ring is formed on the first fitting part 11, the toothed wheel and the toothed ring meshing with each other. The diameter of the tip circle of the external toothing of the toothed wheel is smaller by at least the depth of one tooth than the diameter of the root circle of the internal toothing of the toothed ring. A corresponding difference in the number of teeth of the toothed wheel and the toothed ring of at least one tooth permits a rolling movement of the toothed ring on the toothed wheel. One of the two fitting parts 11 and 12 has a collar which preferably serves as a bearing for the driver 21. Supported on the collar (with their curved inner surfaces) are two wedge segments which bear (with their curved outer surfaces and preferably by means of a slide bearing bush) the other of the two fitting parts 11 and 12. The driver 21 has a driver segment which engages with clearance between the narrow sides of the wedge segments. The mutually facing broad sides of the wedge segments each receive an end finger of a spring which presses the wedge segments apart in the circumferential direction.

The wedge segments 27 (and the spring) define an eccentric which, in the extension of the direction of eccentricity, presses the toothed wheel into the toothed ring at an engagement site. When drive is effected by means of the rotating shaft 7 which rotates (several times), a torque is first of all transmitted onto the driver 21 and then, by means of the driver segment, onto the eccentric which is so defined and which slides along the slide bearing bush, shifting the direction of eccentricity and thus shifting the site of engagement of the toothed wheel in the toothed ring, this presenting itself as a wobbling rolling movement, i.e. as a relative rotation with a superimposed wobbling movement. By this drive of the fittings 10, the inclination of the backrest 4 is continuously adjustable between several positions of use.

Optionally, a third fitting part is provided which, on the one hand is fixedly connected with the structure of the backrest 4 and, on the other hand, is pivotably supported relative to the fitting part 11 or 12 which is not assigned to the seat part 3 and is releasably locked with it. This configuration allows a free-pivoting of the backrest 4 for facilitating the access to a rear seat row, without changing the adjusted inclination of the backrest 4.

According to a second basic type, the fitting 10 is configured as a detent fitting, in which the first fitting part 11 and the second fitting part 12 are lockable with respect to one another, as described, for example, in DE 10 2006 015 560 B3, the relevant disclosure of which is expressly incorporated herein. The second fitting part 12 has guide segments which, with straight guide surfaces, pairwise laterally in the radial direction guide one lock each. The locks are provided at their radially outer end with a toothing which can engage with a toothed ring of the first fitting part 11, which is configured as a hollow wheel. When the toothed ring and the locks cooperate, the fitting 10 is locked. The guide segments bear against the toothed ring of the first fitting part 11 with one bent bearing surface each, the two fitting parts 11 and 12 thus bearing one another. An eccentric which is arranged in the installation space which is defined between the fitting parts 11 and 12 is seated on the driver 21 in a rotationally secure manner or at least mechanically connected with it. A spring arrangement acts upon the eccentric which influences on the radially movable locks and acts upon them, so that they are pressed radially outward, in order to engage in the toothed ring. A control disc which preferably is seated on the eccentric or on the driver 21 in a rotationally secure manner, cooperates with the locks, in order to take the locks back, i.e. to pull them radially inward from the toothed ring, thus unlocking the fitting 10 and the two fitting parts 11 and 12 being rotatable relative to one another, during a rotation (by few degrees) of the driver 21—and the eccentric of the control disc which is driven by it. The inclination of the backrest 4 is thus adjustable for seating use between several positions of use.

Common to both basic types is that a quick fastener 50 is pushed over the shaft 7 from its outer end up to the fitting 10, preferably in the case of both fittings 10. The quick fastener 50, which builds a further component of the fitting system, is seated on the shaft 7 after its mounting in an axially non-displaceable manner. For this purpose, a plurality of (in the present case six) tongues 50b which are distributed in the circumferential direction, protrude radially inward (and axially in the direction which is faced away from the fitting 10) from the basic body 50a of the quick fastener 50, such basic body at least partly enclosing the shaft 7 in a ring-shaped manner. The tongues 50b of the quick fastener 50 which is composed, for example, of spring steel bear under bias against the shaft 7. Due to this frictional resistance, a displacement of the quick fastener 50 relative to the shaft 7 in the direction which is faced away from the fitting 10 is virtually impossible, i.e. in view of the forces acting during use and without tools, and, in the opposed direction (facing towards the fitting 10), in which the quick fastener 50 has been pushed on, it is considerably complicated and, due to its bearing against the fitting 10, impossible as well. Moreover, the tongues 50b and the splined shaft profile of the shaft 7 are form-fitting in the circumferential direction.

In order to also prevent a displacement of the shaft 7 relative to the fitting 10—and thus to the driver 21—, what is ensured by means of the quick fastener 50 bearing against the fitting in only one of two possible directions, the quick fastener 50 is connected, according to the invention, with the driver 21 or with its securing element 43, depending on which side of the fitting 10 faces towards the outer end of the shaft 7. The quick fastener 50 thus secures the cooperation of the shaft 7 and the driver 21 axially in both directions. For said connection, the quick fastener 50 has at least one, preferably a plurality of (in the present case six) fingers 50c which axially protrude from the basic body 50a, distributed in the circumferential direction, and which face towards the fitting 10. The fingers 50c preferably cooperate in a form-fitting manner with the driver 21 or with the securing element 43. They can be configured, for example, as hooks or the like, which engage behind the driver 21 or the securing element 43, for example engage in a continuous groove of the driver 21 with a lug 50d which faces radially inward. Between the fingers 50c, preferably in an alternating manner, further (in the present case six) axially protruding segments 50e are provided, which can facilitate positioning of the quick fastener 50 relative to the driver 21.

LIST OF REFERENCE NUMERALS

• 1 vehicle seat
• 3 seat part
• 4 backrest
• 5 handwheel
• 7 shaft
• 10 fitting
• 11 first fitting part
• 12 second fitting part
• 21 driver
• 43 securing element
• 50 quick fastener
• 50 a basic body
• 50 b tongue
• 50 c finger
• 50 d lug
• 50 e segment

Claims

1. A fitting system for a vehicle seat, in particular for a motor vehicle seat, with an axially extending shaft, which is rotatable in the circumferential direction,at least one fitting which is provided with a rotatably supported driver which is axially secured by a securing element, for driving or for unlocking the fitting, wherein the shaft cooperates with the driver in the circumferential direction in a rotationally secure manner or mechanically connected, in order to rotate the driver, andat least one quick fastener which is seated on the shaft in an axially non-displaceable manner, in order to secure the cooperation of shaft and driver axially in at least one direction,wherein the quick fastener is connected with the driver and/or its securing element,wherein the quick fastener at least partly encloses a basic body which is configured in particular in a ring-shaped manner and encloses the shaft at least partially, and which is provided with at least one finger which axially protrudes from the basic body and which faces towards the fitting,wherein the provided fingers cooperate with the driver or with the securing element in a form-fitting manner.

2. (canceled)

3. (canceled)

4. A fitting system according to claim 1, wherein the provided fingers are configured as hooks which engage behind the driver or the securing element.

5. A fitting system according to claim 1, wherein the provided fingers have a lug which faces radially inward.

6. A fitting system according to claim 1, wherein the quick fastener is provided with segments between the fingers, such segments axially protruding from the basic body.

7. A fitting system according to claim 1, wherein the quick fastener is provided with tongues which protrude from the basic body radially inward, and which bear against the shaft, in particular under bias.

8. A fitting system according to claim 1, wherein the fitting is provided with fitting parts which are rotatable relative to one another, wherein the fitting parts are in geared connection with one another by means of a toothed ring and of a toothed wheel which meshes with it, which carry out a relative rolling movement due to a rotating eccentric which is driven by the driver, or wherein the fitting parts can be locked with one another by means of radially displaceable locks which are guided by the one fitting part and upon which a spring-loaded, rotatably supported eccentric for cooperating with a toothed ring of the other fitting part can act, and which can be taken back by the rotation of the driver.

9. A vehicle seat, in particular motor vehicle seat, having a fitting system according to claim 1.

10. A quick fastener for a fitting system according to claim 1.