DE102006036623B3 - Vehicle seat headrest activation, through occupant body weight against a plate on a collision, has a zigzag structure of bent leaf springs for the extension mechanism to set the headrest in the safety position - Google Patents

Abstract

The mechanism to activate the headrest of an automobile seat, to bring it into the safety position on a collision through mass forces of the occupant's body against a plate, has an extension system (17) with a zigzag structure (19) where at least one zigzag has an injection molded plastics section (20) bonded to the extender as a bent leaf spring (21) at an angle (alpha ).

Description

The Invention relates to an actuator for a vehicle component, especially for the headrest a vehicle seat, which due to accident at least partially under the effect of inertia of the seat occupant from their position of use to the head of the seat occupant towards a safety position is displaced, wherein the Aktuierungsmittel by a transfer device is operatively connected to the vehicle component and an on the transmission means acting, in initial position with zigzag-shaped Having deflections provided stretching agent.

State of technology

passenger are already at a relatively slight rear impact of danger exposed, under the effect of accidental acceleration forces overstretching the cervical spine to suffer. Rigid with the backrest Although the headrest connected to the vehicle seat is capable of damaging the risk of injury However, they are in the position of use, however for reasons of comfort in usually too far from the head to get neck injuries effectively prevent. This is true even if the headrest, the Size of the vehicle occupant accordingly, by moving their guide rods in the guide sleeves of the backrest to the correct height was set.

to Improvement of occupant protection were therefore safety devices developed in the event of a rear impact automatically by the Operating position in a safety position displaceable headrest pad , thereby reducing its distance from the occupant's head becomes. With regard to the function of such headrests is expressly the document WO 2005/097545 A2 referenced.

Out International Patent Application WO 2006/037801 A1 is an actuation agent of the aforementioned type known. It consists of one, the same a "W", zig-zag shaped joint made of plate elements, which in case of an accident perpendicular to their the seat occupant facing surface side be charged with a force. The joint assembly is doing by enlargement of the Stretched angle between the plate elements, making it shallower, but also longer becomes. This change in length is transferred to a Bowden cable and from this to the headrest transferred.

Of the Articulated compound must be in initial position to the zigzag-shaped figure to be kept, on the one hand in every joint led and on the other hand by separate springs, at least in the headrest, biased become.

task

Of the Invention is based on the object, a compact, lightweight and powerful actuator, especially for a crash-active Headrest, provide.

solution

The Task is in a generic Aktuierungsmittel according to the preamble of claim 1 solved by at least one at least formed a deflection having-pointing portion of the extender integrally is.

Of the The term "zig-zag" is to be interpreted broadly and also includes undulating extender. As well includes the one-piece Training of the section not sufficient that further functional units are mounted on the section, for example, by riveting local stiffeners. Rather, it is Essential to the invention that at least two intermediate elements of Section without Interruption in the area of the intermediate deflection into each other.

Preferably the extender comprises a section in the shape of a zig-zag Leaf spring, which under the effect of inertia of the Sitting occupant against their spring force is stretchable.

The Leaf spring can be inexpensively made of sheet steel consistently the same wall thickness become. Such an extender has in its kinks an inherent rigidity, by which the effort to guide the Extender can be significantly reduced. On the insert separate tension springs can be dispensed with. Besides that is This extender is particularly light because there are no joint areas must train.

Further It is conceivable that the extender is a section with flexural soft Has deflections and rigid intermediate areas. Here, the section with as Film hinge trained deflections small wall thickness and stiff Provided intermediate areas of increased wall thickness be. The increase The wall thickness can be achieved by placing stiffening plates or the like. Preferably, however, the section becomes made of plastic by injection molding manufactured, with the range of different wall thickness already in the injection mold be formed.

characters

The Figures represent examples and schematically different versions of the invention.

It demonstrate:

1 a motor vehicle seat according to the invention with an accidentally displaceable headrest,

2 a first inventive actuating means in the initial position with baffle element ( 2a ), without baffle element ( 2 B ) as well as in the condition of accidental stretching without baffle ( 2c )

3 a representation of an isolated portion of the extender according to another embodiment of the invention.

The in 1 illustrated motor vehicle seat 1 consists of a seat part 2 and a backrest 3 with a headrest 4 , The headrest 4 has a base 5 on, by means of handrails 6 height adjustable with the backrest 3 connected is. In front of the base 5 is a cushion part 7 arranged accidentally by means of a drive device 8th in the direction of the head of the seat occupant forward (upholstered part 7 ' ) is relocated. The Antriebsein direction 8th is through an actuation agent 9 actuated, by means of a guided by at least one holding rod Bowden cable 10 with the drive device 8th is actively connected. The actuation agent 9 is in the lower area (pool system) of the backrest 3 arranged and by the rear impact in the upholstery of the backrest 3 pressed body of the seat occupant, absorbs the energy gained and transmits it through the Bowden cable 10 in the drive device 8th , By the forward displacement of the upholstery part 7 ' becomes the contact surface 11 the headrest 4 moved closer to the head of the seat occupant (contact surface 11 ' ) and thereby prevents hyperextension of the neck vertebrae.

to Effect of such headrests and the construction of a suitable drive means is hereby expressly refer to the document WO 2005/097545 A2.

This in 2a represented actuator 9 consists of a basic carrier 12 from the back of the backrest 3 inserted into the backrest structure and by means of lateral tabs 13 is bolted to the vertical beams of the backrest structure. On its side facing the seat occupant is the actuator 9 with a trough-shaped impact element 14 provided, which in case of an accident in the direction of arrow A to the basic carrier 12 is postponed.

baffle 14 and basic carrier 12 are on their top and bottom with parallel to each other in horizontal surfaces extending guide slots 15 provided in which guide pin 16 an extender 17 are guided displaced to the side.

How out 2 B with the baffle removed 14 Obviously, the guide pins collar 16 up and down from stiff, frame-like side pieces 18 . 18 ' of the extender 17 out. The side pieces 18 . 18 ' take further with zig-zag-shaped deflections 19 provided, middle section 20 in the form of a correspondingly curved leaf spring 21 on. The leaf spring 21 supports the front and rear of the baffle element 14 or the basic carrier 12 from.

From the side is a Bowden cable 10 to the basic carrier 12 led, whose shell 22 on the left side piece 18 ' of the extender 17 is stored. The soul 23 of the Bowden cable extends behind the basic carrier 12 to the right side piece 18 of the extender 17 and is fixed there.

In case of accidental displacement of the impact element 14 becomes the leaf spring 21 stretched elastically. The angles α in the area of the deflections 19 are thus increased compared to the initial position (α 'in 2c ). This will cause the side pieces 18 . 18 ' in the guide slots 15 moved apart to the side (arrows B, B ') and the soul 23 with a particularly short reaction time from the shell 22 of the Bowden cable 10 pulled out. This relative movement is by the Bowden cable 10 to the headrest 4 transfer and transfer them to their safety position.

In the execution after 3 consists of the isolated section shown 20 from a one-piece plastic injection molded part 24 , its diversions 19 are formed with a small wall thickness film hinge-like, while the between the deflections 19 located intermediate areas 25 are designed rigid with greater wall thickness.

1

vehicle seat

2

seat part

3

backrest

4

headrest

5

Base

6

Handrail

7, 7 '

upholstery part

8th

drive means

9

actuating means

10

Bowden

11 11 '

contact surface

12

base support

13

flap

14

baffle

15

guide slot

16

spigot

17

extender

18

counterpart

19

redirection

20

section

21

leaf spring

22

Shell (of Bowden)

23

soul (of Bowden cable)

24

Plastic injection molded part

25

intermediate area

Claims (6)

Actuating agent ( 9 ) for a vehicle component, in particular for the headrest ( 4 ) of a vehicle seat ( 1 ), which due to accident, at least partially under the effect of inertia of the seat occupant from its position of use to the head of the seat occupant is displaced towards a safety position, wherein the actuator is operatively connected by a transmission device with the vehicle component and acting on the transmission means, in initial position with zick- Zack-shaped deflections ( 19 ) ( 17 ), characterized in that at least one at least one deflection ( 19 ) ( 20 ) of the extender ( 17 ) is integrally formed. Actuating agent according to claim 1, characterized in that the extender ( 17 ) a section ( 20 ) in the form of a zigzag-shaped leaf spring ( 21 ), which is stretchable under the effect of the mass inertia of the seat occupant against its spring force. Actuating means according to claim 2, characterized in that the leaf spring ( 21 ) consists of sheet steel. Actuating agent according to claim 1 to 3, characterized in that the extender ( 17 ) a section ( 20 ) with flexible deflections ( 19 ) and rigid intermediate areas ( 25 ) having. Actuating means according to claim 4, characterized in that the portion ( 20 ) formed as a film hinge deflections ( 19 ) small wall thickness and rigid intermediate areas ( 25 ) has increased wall thickness. Actuating means according to claim 4 or 5, characterized in that the portion ( 20 ) made of plastic, in particular by injection molding, is made.