DE102008055987A1 - Headrest for vehicle seat, has base part, levers and headrest carrier part, where base part is arranged on stay bar and levers are moved by transfer unit - Google Patents

Abstract

The headrest has a base part (1) and a headrest carrier part (7), where the base part is arranged on a stay bar (2). The levers (3,3') are moved by a transfer unit. A transfer device is provided for simultaneous pivoting of the levers relative to the base part by an operation of the transfer unit.

Description

The The present invention relates to a headrest for a vehicle seat with a base part and with a headrest support part, wherein the base part is arranged on at least one holding bar, wherein the headrest support member in a rear impact relative to the base part in the direction of the head of a vehicle seat occupant displaceable from a design position to a safety position is.

These generic headrests, which are referred to as so-called crash-active headrests, are known from the prior art, for example DE 101 24 662 A1 , of the FR 2 898 308 A1 , of the DE 199 51 966 B4 , of the DE 296 14 238 U1 . DE 101 42 625 , of the DE 102 08 620 C1 . DE 103 02 778 A1 as well as the DE 102 60 582 B3 known. However, the headrests described therein are relatively complex, too large overall and improvable in their injury reduction effect.

It Therefore, the object of the present invention was a headrest to provide that the disadvantages of the state does not have the technique and in particular an easily releasable, with simple means triggerable and by simple means also realizable resettable active headrest.

Solved The task is accomplished by a headrest for one Vehicle seat with a base part and with a headrest support part, wherein the base part is arranged on at least one holding bar, wherein the headrest support member in a rear impact relative to the base part in the direction of the head of a vehicle seat occupant displaceable from a design position to a safety position is, wherein the headrest a first and second lever has to displace the headrest support part, wherein a first end of the lever is rotatably mounted and wherein a second end of the lever with a sliding bearing relative is provided to the headrest support member movable, wherein the levers are movable by means of a transmission means and wherein the headrest is a transmission device for substantially simultaneous pivoting of the lever relative to Base part upon actuation of the transmission means having.

hereby it is possible with simple means in an advantageous manner, an easy to operate active headrest to provide that works reliably and also is easily reset, d. H. from her Safety position back to their design position to adjust. The so-called design position corresponds here the normal usage situation of the headrest, d. H. a situation in which the headrest support part not or at least not completely in the direction of Head of the vehicle occupant is moved. The headrest is here constructed in two parts and has in the safety position a greater depth than in the design position.

The Task is also solved by a headrest for a vehicle seat with a base part and with a Headrest support part, wherein the base part at least a support rod is arranged, wherein the headrest support part in a rear impact relative to the base part in the direction of Head of a vehicle seat occupant from a design position into a Safety position is displaceable, with the headrest a first and second lever for displacing the headrest support member has, wherein a first end of the lever is rotatably mounted and wherein a second end of the lever with a sliding bearing relative is provided to the headrest support member movable, wherein the headrest support member one in the direction of movement between the design position and the safety position before the Base part arranged first portion and one in the direction of movement between the design position and the safety position behind the Base part arranged second portion has.

hereby is it possible that the headrest in one part, d. H. without relative movement between a front part and a rear part is made (so-called one piece design), so that the headrest made particularly easy and inexpensive can be and especially with a one-piece cover material (so-called bag cover) can be surrounded. The headrest has no larger in the safety position Depth on than in the design position.

According to the invention it is advantageous if the headrest support part one in the direction of movement between the design position and the safety position arranged in front of the base part first portion and a moving direction between the design position and the safety position behind the base part having arranged second portion. As a result, it is advantageously possible according to the invention by making headrest (one piece design) without relative movement of a front part relative to a rear one Part of the headrest particularly simple and inexpensive and in particular with a cost-effective Surround the cover material.

According to a first embodiment of the invention, it is particularly preferred for the transmission device to have a first cable pull and at least one deflection roller. As a result, a simultaneous control or movement of the lever is possible with simple means. Further, according to the first embodiment, it is preferable that the transmission means and the first cable or the first cable and a second cable for rotation of each one of the levers is provided. Furthermore, according to the first embodiment, it is particularly preferred that the transmission means comprises a slider, the movement of the slider being transmitted to the first and second cables. In particular, in the presence of two cables, a good synchronous movement of the lever is advantageously possible.

According to one second embodiment, it is preferred according to the invention that the transmission device is a drive gear, a first rack and a second rack has. Further is according to the second embodiment, that the first and second rack respectively with the drive gear combs. Furthermore, it is according to the second Embodiment particularly preferred that the first rack with the first lever and the second rack with the second lever over in each case an additional toothing combs. Especially advantageous here is that the teeth a good synchronous movement the lever is possible.

According to both According to the invention, embodiments are preferred that the transmission means is a Bowden cable or that the headrest comprises a spring means, wherein the spring means the levers in their design position pretensions.

One Another object of the present invention relates to a vehicle seat with a headrest according to the invention.

The Headrest according to the invention has according to both Embodiments, a base part and a headrest support member on. The base part is arranged on at least one holding rod. This support rod may be a U-shaped bent Act component that has good mechanical properties to increase has the stability of the headrest. alternative two handrails can be provided. The handrail (s) in turn, is / are usually in the back of a Vehicle seat attached. For comfort adjustment, the headrest is mostly height and / or adjustable in their inclination angle. The Height adjustment can be achieved by a displacement of the headrest relative to the handrails and / or by a displacement of the Handrails relative to the backrest done. Furthermore the headrest has a headrest support part, that at a rear impact from a design position, in the direction the head of a seat occupant, relocatable to a safety position is. Between the base part and the headrest support part are provided two levers, each having a first end and a second end, wherein the first end relative to the base part, preferably about a support rod, is rotatably mounted and wherein the second end with a plain bearing directly or indirectly on the headrest support part is arranged or is movable relative to this. The headrest can have four such levers. When relocating the headrest support part from the design position to the safety position the lever is turning and the slide bearing is essentially moving translationally along the headrest support part. As a result, the headrest can be very simple and flat. The headrest support part becomes relative to the base part preferably only translationally moved in one spatial direction. These a spatial direction does not have to be horizontal or vertical, but rather can be arranged at any angle in space.

Preferably are arranged on the sliding bearing latching means, which with locking means on the headrest support member in the safety position or in positions of the headrest support part, resting between the design position and the safety position, latching interact. When relocating the headrest support part from the design position to the safety position move the Locking means on the sliding bearing relative to the locking means on the headrest support member and lock in the position that the headrest support part has reached when the head of the seat occupant beats against the headrest support member. Preferably, the locking in the respective safety position reversible, so that the headrest support part after the crash again transferred to its design position can be when no force or a low enough force exerted on the headrest support member becomes.

In the following, the invention is based on the 1 . 2 and 3 explained. These explanations are merely exemplary and do not limit the general inventive concept.

in this connection shows

1 a schematic exploded view of essential parts of a headrest according to the invention,

2 a schematic perspective view of the headrest according to the invention according to a first embodiment and

3 a schematic perspective view of the headrest according to the invention according to a second embodiment.

Out 1 it can be seen that the headrest according to the invention is a base part 1 has, here for the positive reception of two handrails 2 is trained. The handrails 2 are in turn arranged in a known manner on the backrest (not shown) of a vehicle seat. Furthermore, the headrest has a headrest carrier part 7 on, which is usually provided with a padding (not shown) and can be transferred in a rear crash from a design position in the direction of the head of the seat occupant in a safety position. Between the base part 1 and the headrest support part 7 are two levers 3 . 3 ' arranged, each having a first end 3.1 the lever 3 . 3 ' relative to the base part 1 is rotatably provided, in particular on a support rod 2 is rotatably mounted and wherein in each case a second end 3.2 (In particular via a (not shown) pin and a hinge-like connection) by means of a sliding bearing 5 relative to the headrest support member 7 is movably connected. In the design position are the levers 3 . 3 ' essentially parallel to the base part 1 arranged. At the transition of the lever 3 . 3 ' from the design position to a safety position (not shown), the levers rotate 3 . 3 ' in opposite directions relative to the base part 1 and especially around the handrails 2 where, for example, the left lever rotates clockwise and the right lever rotates counterclockwise. The sliders 5 doing a translational movement of the center of the headrest support part 7 towards its edges (but also a reverse translational movement, namely from the edges (in the design position) to the center of the headrest support part would be possible).

To take the safety position in a rear crash, is in the 2 and 3 represented transmission means 20 provided, which is realized in particular in the form of a Bowden cable. The 2 Here, a first embodiment for realizing the transmission of the movement of the transmission means 20 in a rotary motion of the lever 3 . 3 ' while the 3 represents a second embodiment for realizing this transfer.

According to the invention, the headrest can be realized as a so-called one-piece headrest (one piece design), which has no greater depth in the safety position than in the design position of the headrest support part 7 , For this purpose, the headrest support part 7 a first subarea 7 ' and a second subarea 7 '' on, so that the headrest support part 7 the base part substantially completely surrounds. When setting the safety position then the headrest support part 7 (and thus the back of the headrest) only moved. Alternatively, the headrest can also be realized as a so-called two-piece headrest, in which the headrest support member 7 in the direction of movement between the design position and the safety position (forward) is issued (and thus the total depth of the headrest in the safety position is increased).

According to the first embodiment ( 2 ) is a slider 34 with the transmission medium 20 connected. A tensile force on the transmission medium 20 causes a movement of the slider 34 (For example, in an upward direction as shown 2 ). The slider 34 is with a first cable 31 and with a second cable 32 connected, the first cable 31 the connection between the slider 34 and the first lever 3 (over the pulley 33 ) and the second cable 32 the connection between the slider 34 and the second lever 3 ' (About another, not designated by a reference roller guide) manufactures. Alternatively (not shown) is the slider 34 with the first cable 31 connected, the at least one pulley 33 (In the example shown, two pulleys) both with the first lever 3 as well as with the second lever 3 ' connected is. In this case (ie in the presence of only the first cable 31 which with both the first lever 3 as well as with the second lever 3 ' connected) may be the first cable 31 loose on the slider 34 be hooked.

The transmission of the movement of the first cable 31 or the first cable 31 and the second cable 32 on the levers 3 . 3 ' via a (not shown) attachment to the levers 3 . 3 ' such that at a tensile force in the first and / or second cable 31 . 32 a torque on the lever 3 . 3 ' is exercised. For this purpose, for example, one (not shown) on the levers 3 . 3 ' each formed receptacle for attaching the ends of the first cable 31 or in each case one of the ends of the first and second cable 31 . 32 intended. Upon actuation of the active headrest according to the invention, the ends of the first cable pull 31 or the ends of the first and second cables 31 . 32 Pulled (over the pulley or the pulleys) in particular towards the center of the headrest out and the pulling force in a rotation of the lever 3 . 3 ' implemented. A spring device 21 , in particular in the form of a leg spring, causes a bias of the lever 3 . 3 ' Towards the design position, so that when a decrease in the tensile force in the transmission medium 20 a provision of the active headrest (or the headrest support member 7 relative to the base part 1 ) he follows.

According to the second embodiment ( 3 ) is a drive gear 35 with the transmission medium 20 connected. A tensile force on the transmission medium 20 causes a rotational movement of the drive gear 35 (For example, in a counterclockwise direction as shown 3 ) due to a connection 35 ' the transmission means 20 on the drive gear 35 , The drive gear 35 is about a gearing with a first rack 36 and with a second rack 37 connected so that a rotational movement of the drive gear 35 to a translation movement of the racks 36 . 37 leads.

Each with an additional toothing 38 is the first rack 36 with the first lever 3 and the second rack 37 with the second lever 3 ' connected. The racks 36 . 37 are preferred via a sliding guide 39 led provided. The spring device 21 , especially in the form of each between the racks 36 . 37 and the base part 1 acting tension springs, causes a bias of the lever 3 . 3 ' Towards the design position, so that when a decrease in the tensile force in the transmission medium 20 a provision of the active headrest (or the headrest support member 7 relative to the base part 1 ) he follows. The spring device 21 According to the second embodiment, alternatively or additionally (by means of a changed effective direction or connection), it can also be designed as a compression spring and / or leg spring. In the second embodiment, the levers 3 . 3 ' during a movement of the transmission means 20 advantageously moved synchronously.

1

base

2

Handrail

3

first lever

3 '

second lever

3.1

first End of the lever

3.2

second End of the lever

5

bearings

7

Headrest support part, Head-support base plate

7 '

first subregion

7 ''

second subregion

20

transmission means

21

spring means

31

first cable

32

second cable

33

idler pulley

34

slide

35

drive gear

35 '

connection

36

first rack

37

second rack

38

additional gearing

39

slide

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 10124662 A1 [0002]
• FR 2898308 A1 [0002]
• - DE 19951966 B4 [0002]
• - DE 29614238 U1 [0002]
• - DE 10142625 [0002]
• - DE 10208620 C1 [0002]
• - DE 10302778 A1 [0002]
• DE 10260582 B3 [0002]

Claims (11)

Headrest for a vehicle seat with a base part ( 1 ) and with a headrest support part ( 7 ), the base part ( 1 ) on at least one handrail ( 2 ) is arranged, wherein the headrest support part ( 7 ) in a rear impact relative to the base part ( 1 ) is displaceable in the direction of the head of a vehicle seat occupant from a design position to a safety position, wherein the headrest has a first and second lever ( 3 . 3 ' ) for the displacement of the headrest support part ( 7 ), wherein a first end ( 3.1 ) the lever ( 3 . 3 ' ) is rotatably mounted and wherein a second end ( 3.2 ) the lever ( 3 . 3 ' ) with a sliding bearing ( 5 ) relative to the headrest support member ( 7 ) is movably provided, characterized in that the levers ( 3 . 3 ' ) by means of a transmission means ( 20 ) are movable and that the headrest a transmission means for substantially simultaneous pivoting of the lever ( 3 . 3 ' ) relative to the base part ( 1 ) upon actuation of the transmission means ( 20 ) having. Headrest according to Claim 1 or according to the preamble of Claim 1, characterized in that the headrest support part ( 7 ) in the direction of movement between the design position and the safety position in front of the base part ( 1 ) arranged first subregion ( 7 ' ) and one in the direction of movement between the design position and the safety position behind the base part ( 1 ) arranged second subregion ( 7 '' ) having. Headrest according to one of the preceding claims, characterized in that the transmission device comprises a first cable ( 31 ) and at least one deflection roller ( 33 ) having. Headrest according to one of the preceding claims, characterized in that the transmission means ( 20 ) and the first cable ( 31 ) or the first cable ( 31 ) and a second cable ( 32 ) for rotation of each one of the levers ( 3 . 3 ' ) is provided. Headrest according to one of the preceding claims, characterized in that the transmission device is a slider ( 34 ), wherein the movement of the slider ( 34 ) on the first and / or second cable ( 31 . 32 ) is transmitted. Headrest according to one of the preceding claims, characterized in that the transmission device is a drive gear ( 35 ), a first rack ( 36 ) and a second rack ( 37 ) having. Headrest according to one of the preceding claims, characterized in that the first and second toothed rack ( 36 . 37 ) each with the drive gear ( 35 ) combs. Headrest according to one of the preceding claims, characterized in that the first rack ( 36 ) with the first lever ( 3 ) and the second rack ( 37 ) with the second lever ( 3 ' ) each have an additional toothing ( 38 ) combs. Headrest according to one of the preceding claims, characterized in that the transmission means ( 20 ) is a Bowden cable. Headrest according to one of the preceding claims, characterized in that the head restraint comprises a spring means ( 21 ), wherein the spring means ( 21 ) the levers ( 3 . 3 ' ) into its design position. Vehicle seat comprising a headrest according to any one of the preceding claims.