Seat width adjustment mechanism

The present disclosure relates to a mechanism for adjusting the width of a motor vehicle seat.

DE 10 2006 020 671 A1 shows a motor vehicle driver's seat which can be adjusted in width. The seat has two seat halves, and the distance between the halves can be changed by means of a spindle drive. An elastic intermediate element bridges a gap between the two seat halves, which becomes larger with increasing distance. The different resilience of the flexible intermediate element on the one hand, and the adjacent seat halves on the other hand, can lead to an inhomogeneous load behavior of the seat area and an undesired worsening of the seat comfort.

According to an aspect of the present disclosure, a seat adjustment device improves seat comfort. A vehicle seat width adjustment device includes a first adjustment element and a second adjustment element, wherein a distance between the two adjustment elements can be changed by means of an actuator device. A guiding element is connected to each of the adjustment elements. A piece of material extends between and over the guiding element and is held under tension so that the guiding elements slide with respect to the material, and so that the amount of material which forms a seat surface can be adapted by changing the distance between the two guiding elements. The material forms the entire seat surface so that a possible impairment of seat comfort because of an inhomogeneous load behavior of the seat surface is avoided.

The material is preferably a textile fabric. The textile fabric can be given a desired load behavior with a corresponding specification of the fiber orientation and the fiber characteristics. The textile fabric is designed as a breathable functional fabric.

A seat and/or backrest padding made of a spacer fabric can be placed on the textile fabric. The seat and/or backrest padding can be affixed on the seat surface formed by the material, in a removable manner with Velcro fasteners. The spacer fabric is a three-dimensional textile fabric, in which two opposite textile outer surfaces are kept at a distance by spacer connecting threads. The characteristic structure of the spacer fabric leads not only to an improved moisture removal and air permeability of a thus equipped seat and/or backrest padding, but also to a defined elastic behavior in the longitudinal and transverse direction.

Moreover, the inelastic material may be held under tension by several tension springs. The tension springs are connected to a base frame of the vehicle seat. By replacing the tension springs, it is also possible to subsequently adapt the resilience of the seat surface to various driver weights and sitting habits.

The two adjustment elements are pivotally mounted on a base frame of the motor vehicle seat. The pivotal mounting provides a compact and robust structure for the actuator device. In addition to or as an alternative to, the adjustment elements to change the distance relative to one another can be arranged so that they can be displaced longitudinally. In this case, a height change of the seat surface, which would inevitably appear when the adjustment elements are swiveled, can be avoided, or at least reduced.

The adjustment elements are L-shaped members, wherein, a first leg is attached to the guiding element, and a second leg is pivotally coupled to a base frame of the motor vehicle seat. The pivoting of the adjustment element is controlled by the actuator device, wherein the lever ratios resulting from the L-shaped design of the legs favor a pivoting of the adjustment element.

To control the pivoting, the actuator device can comprise an actuation transmitter, which works with a spindle drive which is actuatable manually and/or with an electric motor. The actuation transmitter has a threaded bush, which is supported transverse to the adjustment direction so it can swivel, into which meshes a threaded spindle drive. In turn, the threaded spindle is connected with a hand crank and/or an electric motor for the adjustment of the seat width.

In order to make possible an opposite pivoting of the two legs, the actuator device can have its own actuation transmitter for each of the two legs. In this case, the spindle drive comprises two threaded spindle sections, designed in opposite directions.

The guiding element is a sliding rod, oriented transverse to the adjustment direction. To increase the twisting rigidity, it is conceivable that for each of the two adjustment elements, an arrangement of the legs in pairs is provided, wherein the sliding bar connects the two legs in the form of a bridge in the area of the first leg end with one another. Moreover, a swivel rod, connecting the two legs in the area of the second leg end can be provided, which is supported on a base frame of the motor vehicle sea in such a way that it forms a swivel leg to swivel the adjustment element.

In order to impart an ergonomic surface course to the seat surface formed by the material, the sliding rod may be bent outwardly. This produces a seat hollow-type formation of the seat surface, formed by the material.

FIG. 1 is a perspective view of a seat width adjustment mechanism according to the invention; and

FIG. 2 is an end view of the seat width adjustment mechanism of FIG. 1 .

A seat width adjustment mechanism 10 includes a first adjustment element 12 a and a second adjustment element 12 b . A distance D between the two adjustment elements 12 a and 12 b can be changed with an actuator device 14 . Each adjustment element 12 a and 12 b includes a guiding element 16 a , 16 b . A piece of material 18 extends or runs between the two adjustment elements 12 a , 12 b . Material 18 is clamped and slides along the guiding element 16 a and 16 b so that a portion of the material 18 which forms a seat surface 20 , can be adapted by changing the distance D between the two adjustment elements 12 a and 12 b . The material 18 is omitted for reasons of clarity in FIG. 1 , so that reference is made in this connection, to FIG. 2 .

The material 18 is a textile fabric 22 , in particular, a breathable functional fabric. The textile fabric 22 is preferably inelastic and is held under tension by several tension springs 24 . The tension springs 24 are connected with a base frame 26 of the motor vehicle seat. A seat and/or backrest padding, made of a spacer fabric 28 , is affixed on a portion of the textile fabric 22 , forming the seat surface 22 , in a removable manner, with several Velcro fasteners (not shown). The spacer fabric 28 is a three-dimensional textile fabric, in which two opposite textile outside surfaces 32 and 34 are kept at a distance by spacer connecting threads 36 . The spacer fabric 28 is surrounded protectively by a padding cover (not shown).

The two adjustment elements 12 a and 12 b are pivotally mounted so that the distance D can be changed. To increase the twisting rigidity, each of the two adjustment elements 12 a , 12 b includes a pair of L-shaped legs 38 a , 38 b . The guiding elements 16 a , 16 b are rods 40 a , 40 b which are oriented transverse to the distance D. The rods 40 a , 40 b are curved and are convex outwardly in a direction facing away from each other.

Each rod 40 a , 40 b interconnects and forms a bridge between each pair of legs 38 a , 38 b at leg ends 42 a , 42 b . Each pair of legs 38 a , 38 b is connected to a corresponding swivel rod 46 a , 46 b , near the two leg ends 44 a , 44 b . Each swivel rod 46 a , 46 b is supported on the base frame 26 of the motor vehicle seat by a corresponding pair of holders 48 a and 48 b , so that the adjustment elements 12 a and 12 b can be pivoted by the actuator device 14 .

Each swivel rod 46 a , 46 b is mounted to a corresponding actuation transmitter 50 a , 50 b . The transmitters 50 a , 50 b interacts with a spindle drive 52 which is rotated manually and/or with an electric motor (not shown). Each actuation transmitter 50 , 50 b has a threaded bush 54 a , 54 b , which is supported transverse to the adjustment direction so that it can pivot. The threaded bush 54 a , 54 b receives a threaded spindle 56 which is part of the spindle drive 52 . The threaded spindle 56 is in turn, connected with a hand crank and/or an electric motor (not shown) for the seat width adjustment.

In order to pivot the legs 38 a and 38 in opposite directions, the spindle 56 includes two threaded sections 58 a and 58 b which are threaded in opposite directions, so that depending on the rotation direction of the spindle 56 , the distance between the two actuation transmitters 50 a , 50 b and, thus, the distance D between the two adjustment elements 12 a , 12 b increases or decreases.

While the disclosure has been illustrated and described in detail in the drawings and foregoing description, such illustration and description is to be considered as exemplary and not restrictive in character, it being understood that illustrative embodiments have been shown and described and that all changes and modifications that come within the spirit of the disclosure are desired to be protected. It will be noted that alternative embodiments of the present disclosure may not include all of the features described yet still benefit from at least some of the advantages of such features. Those of ordinary skill in the art may readily devise their own implementations that incorporate one or more of the features of the present disclosure and fall within the spirit and scope of the present invention as defined by the appended claims.