EP1429938A1

EP1429938A1 - Motor vehicle rear-seat head-rest

Info

Publication number: EP1429938A1
Application number: EP02800112A
Authority: EP
Inventors: Gerhard Rothstein; Jörg Linnenbrink
Original assignee: Friedr Fingscheidt GmbH
Current assignee: FINGSCHEIDT AUTOMOTIVE GMBH
Priority date: 2001-09-25
Filing date: 2002-09-24
Publication date: 2004-06-23
Also published as: DE10294429D2; WO2003029042A1; US20050052065A1

Abstract

The invention relates to rear-seat head-rest (5) with an adjustment mechanism for use in motor vehicles. The head rest (5) can be moved from a position of use into a concealed position by the force of the weight exerted by the head-rest, pivoting about a pivoting axis (24), and can be motor-driven out of the concealed position into the position of use. In order to obtain high stability of use and provide a favorable design for the purposes of control, a spindle drive (20,21) is provided for the displacement of the head-rest (5).

Description

Rear seat head restraint of a motor vehicle

The invention relates to a rear seat headrest with adjustment mechanism for motor vehicles, the headrest being pivotable about a pivot axis from a position of use into a hidden position using a weight force acting on the basis of a weight of the headrest, and in any case being movable by motor from the hidden position into the position of use.

Such a rear seat headrest is known from DE 35 45 142 AI. An advantage of such a rear seat headrest is that, for example, when the rear seats are not occupied, the corresponding rear seat headrests can be pivoted into a hidden position after being triggered, thereby ensuring the driver an improved rear view. If the rear seats are occupied, the folded rear seat headrests can be moved from the hidden position to the use position. For this purpose, an electric motor assigned to the headrest is used, on the output shaft of which a drive link is rigidly attached. This forms a toggle lever with a coupling rocker which engages on a holder receptacle for the headrest. In the use position of the headrest, the knee lever is in a stretched position. With regard to buckling, this configuration is not very stable in use when higher loads occur. Furthermore, this configuration requires a relatively large electric motor in order to be able to bring the headrest into its different positions. In addition, for example in the case of the headrest occupying the position of use, any crash forces are directed into the motor shaft via the toggle lever which takes up an extended position.

The object of the invention is based on the object of designing a generic rear seat headrest in addition to achieving high stability in terms of control technology. This object is achieved first and foremost in a rear seat headrest with the features of claim 1, with the aim being that a spindle drive is provided for moving the headrest.

The subject matter of the further claims are explained below in relation to the subject matter of claim 1, but may also be of importance in their independent formulation.

As a result of such a configuration, a generic rear seat headrest is created which, in addition to the advantages in terms of control technology, is distinguished by a greater safety value when high loads occur. A spindle drive now serves to move the headrest from the position of use into the hidden position and vice versa. A particularly sensitive, infinitely variable adjustment can be carried out. To operate the spindle drive, the threaded spindle itself can be driven on the one hand, but also a threaded nut located on the threaded spindle. The first alternative is explained in more detail below. The driving electric motor can also be stationary or pivot with the headrest. The first alternative is also explained in more detail below. The electric motor driving the threaded spindle can be dimensioned relatively weak. This leads to a compact construction and a weight saving. In addition, the electric motor drive is designed in such a way that it is unaffected even under high loads. In such cases, the self-locking of the spindle drive is used. For example. the spindle can be driven by a worm gear or a bevel gear. If it is a bevel gear drive, the ring gear can sit on the spindle. Therefore, high adjustment forces can still be applied with a low engine output. In order to minimize the driving forces when the headrest is adjusted, the weight of the headrest is counteracted by a spring. In practice, this looks like that when the headrest is moved from its position of use into the hidden position, together with a pivoting of the headrest, its weight is used to charge the spring, so that it acts in the manner of an energy store. In the hidden position of the headrest, the spring is therefore charged or tensioned to the maximum. When the headrest is shifted from the hidden position to the use position, this movement is therefore supported by the previously charged spring. So essentially the drive only has to overcome the friction in the system or in the spindle drive. This leads to a design of the drive with extremely small dimensions, which is very helpful for integration with an adjustable headrest. Furthermore, it is provided according to the invention that the spring torque resulting from the spring in any case exceeds the torque resulting from the weight force over part of the swivel path. This ensures that the torque is always balanced even if the spring action declines, which occurs after prolonged use. Care is also taken to ensure that there is sufficient force in the initial displacement of the headrest from the hidden position to transfer the headrest to the use position. The measure that the spring is a torsion spring proves to be structurally favorable. It can be manufactured cost-effectively and can be accommodated cheaply in the adjustment mechanism. The measure proves to be particularly advantageous if the spring is wound around the axis of rotation. An existing component is used to hold the spring. Furthermore, the procedure according to the invention is such that the spindle drive acts on the headrest at a transverse distance from the swivel axis. Along with a change in the lateral distance, the position of the headrest changes. The bracket used as a support for the headrest are secured in position according to the invention by means of positive-locking pins. Furthermore, the spindle drive acts on the bracket by means of the form-fitting pin. Accordingly, the form-fitting pins have a double function: on the one hand, they serve to secure the position of the bracket and, on the other hand, to position it with the headrest, so that depending on Position of the form-locking pin either the use or hidden position is realizable. As mentioned above, the spindle drive contains a spindle nut in which the form-fitting pins are also fastened. Because of this, a synchronous displacement of the form-locking pins is guaranteed. If the spindle drive, starting from the position of use of the headrest, shifts it into the hidden position, the form-fitting pins move in the hidden position into a spaced position from the mounting brackets. Nevertheless, the headrest cannot lag behind in the hidden position. This distance position is used to allow the headrest to be folded over further if the backrest is also folded down after the seat has been folded down beforehand. This means that the headrest or its mounting bracket can be pivoted further in the direction of the mounting pin, for example when the backrest to which the headrests are attached is folded over. This further pivoting takes place according to the invention against the force of a return spring. The headrest can also be attached to a swivel bracket overall, possibly with a drive. Furthermore, it is provided according to the invention that the mounting brackets are inserted into mounting receptacles. The latter in turn can be shifted about the pivot axis. Since load forces acting on the headrest in their position of use are largely absorbed by the form-fitting pins, it is advisable to manufacture the holder receptacles from plastic. This can even provide additional flexibility in the event of a crash, which helps to keep the risk of injury lower. Also to be emphasized is the fact that the holder receptacles are spring-biased on the swivel axis in the direction of contact with the form-fitting pin. It is thus ensured that the intended engagement of the form-fitting pins on the holder receptacles is guaranteed, in which position the form-fitting pins simultaneously secure the position of the inserted holder brackets. If the headrest is to be removed, it can be held in place, while the form-locking pegs are turned by a few just be steered into a distance position. As a result, the positive connection is canceled and the bracket can be pulled out of the bracket receptacles. The spindle drive then opens up the possibility of adjusting the headrest as required by small angular degrees. If the hidden position of the headrest is activated, the form-fitting pins continue to move after reaching a certain angular position of the holder receptacles. The lag is limited by the force of the return spring, which force is greater than the spring force acting on the holder receptacles. A design which is particularly advantageous with regard to soiling is realized according to the invention in that the holder receptacles form insertion shafts for the mounting bracket, which insertion shafts have radially recessed free spaces running in the longitudinal direction. Dust or dirt is absorbed by them, so that there is no disadvantage with regard to good guidance of the mounting brackets in the insertion shafts. So that the bracket ends are secured even when the form-fitting pins are at a distance from the mounting receptacles, a mounting lever is provided which, in addition to a mounting pin, serves to secure a bracket in a form-fitting manner. So if the form-fitting pins leave their form-fitting connection, the bracket lever comes into a locking function. In principle, it should be noted that the rear seat headrest can also be adjusted automatically, for example by detecting seat occupancy combined with a seat belt buckle actuation. In the course of retracting the headrest, for example into a receptacle of the parcel shelf, there is a spring spacing between the mounting brackets and the form-fitting pin from a certain angle. When the backrest is folded down, this is advantageously used to enable the headrest to be pushed over, for example from 90 ° to 125 °. Then the user staying in a rear seat of a car can adjust it individually over a certain last adjustment range of the headrest. The latter can be done automatically via sensory detection. To one in the use position of the rear seat headrest To open up further adjustment options, the cushion body, which can be pivoted to a limited extent with the mounting brackets, is spring-biased into a stop position in such a way that, in the course of the method of the headrest, the cushion body is adjustable by abutment against a pivot stop. A further degree of freedom with regard to the possibility of adjusting the headrest is achieved in a generic embodiment in that the cushion body can be moved separately by means of a drive. In addition to the swivel adjustment of the headrest, it can also be adjusted in the Z direction. The rear seat user can therefore adjust the headrest absolutely individually. The drive in question can be designed as an electric motor. The same can be accommodated in the upholstery body itself, so that after the holder bracket with headrest has been adjusted, the height of the cushion body can take place on the ends of the bracket bracket located in the cushion body via the spindle drive. So that the cushion body can always be brought into its hidden position in accordance with regulations even after an adjustment by means of the drive on the side of the cushion body, a movement of the headrest into the hidden position is only possible when the cushion body is in its starting position. This can be brought about, for example, in connection with a seat occupancy detection. If the person in a rear seat leaves the seat, this is communicated via the occupancy detection of the headrest control, so that the upholstery body first moves into the starting position and then the swiveling into the hiding position is initiated. A further embodiment of the rear seat headrest, in which the weight of the headrest is counteracted by a spring, is distinguished by the fact that the overall shape of the spring is U-shaped. The procedure is such that the U-legs cooperate with the pivot bearing, which carries the form-fitting pins opposite the pivot axis, while the U-web acts like a torsion bar and applies the spring force. Accordingly, the U-web runs parallel to the space in the vicinity of the swivel axis. To achieve An optimal suspension is provided according to the invention in that the length of the U-web is greater than that of the U-legs. This is further optimized by the fact that the U-bar is enlarged with regard to the active spring length due to the loop guide. The loop in question can also be used to fix the spring to the headrest holder, namely by the spring being secured against rotation in the area of the loop. In order to compensate for any manufacturing or installation tolerances, the spindle is mounted with play in relation to the headrest holder. In a further version it can be provided according to the invention that the headrest pivots together with the holder. There is also the possibility that in a further embodiment the spindle nut is driven relative to the stationary spindle. Another advantageous feature is that an insertion section is secured by a securing spring position arranged on the holder receptacle. For example, in order to be able to remove the upholstery body with the mounting brackets, the locking spring must be brought into a release position. This can advantageously look such that the securing spring can be displaced into a release position with the aid of a motor.

Three exemplary embodiments of the invention are explained below with reference to the drawings. It shows:

1 schematically shows a rear seat headrest according to the invention in its position of use, relating to the first embodiment,

2 is a perspective view of the headrest bracket according to the position of use of the headrest,

3 is a rear view of the headrest bracket, 4 is a side view in the direction of arrow IV in FIG. 3,

5 shows the section along the line V-V in Fig. 3,

6 shows the section along the line VI-VI in FIG. 3,

7 shows the section along the line VII-VII in Fig. 3,

8 shows the section along the line VIII-VIII in FIG. 6,

9 shows a representation corresponding to FIG. 2, with both the form-fitting pin and the mounting receptacles for the mounting bracket being pivoted through approximately 90 °,

10 shows the corresponding section as in FIG. 6,

11 shows the section comparable to FIG. 7,

FIG. 12 shows the follow-up view of FIG. 9, the holder receptacles remaining in the 90 ° position, while the positive locking

Pins have shifted by 125 ° around the swivel axis,

13 shows the section comparable to FIG. 10,

14 shows the section corresponding to FIG. 11,

15 is a follow-up view of FIG. 12, wherein both the form-fitting pin and the holder receptacles have moved about 125 ° about the pivot axis, 16 shows the section comparable to FIG. 13,

17 shows the section comparable to FIG. 14,

18 the section comparable to that of FIG. 6, with the form-fitting pins being shifted by a few angular degrees, deviating from the position of use of the headrest, with the form-fitting connection being released,

19 the section comparable to FIG. 7,

20 is a schematic representation of the cushion body spring-loaded in a stop position,

21 shows a cross section through the adjustment mechanism of the rear seat headrest according to the second embodiment, relating to the position of use of the headrest,

22 shows a representation comparable to FIG. 21, but relating to the hidden position while the spring is being charged,

23 shows a torque / angle of rotation diagram illustrating the torque profiles of the spring and the headrest,

24 is a side view of the headrest holder receiving the mounting bracket in the position of use of the headrest indicated by dash-dotted lines, relating to the third embodiment,

25 is a perspective view of the headrest bracket, 26 is an individual representation of a perspective holder of the spring which is U-shaped in its overall course,

27 is a view of the spring,

28 shows the section along the line XXVIII-XXVIII in FIG. 27 and

29 shows a representation corresponding to FIG. 24, but with the headrest brought into the hidden position while the spring is being charged.

According to the first embodiment of the rear seat headrest, the numeral 1 denotes a driver seat backrest in FIG. 1. Downstream of it is a rear seat 2, which, as shown in FIG. 1, assumes a folded-up position. A rear seat backrest 3 is assigned to the rear seat seat 2. This can be folded around a folding axis 4 into a horizontal extent.

At its upper end, the rear seat backrest 3 carries a rear seat headrest, designated as a whole by the number 5. This has a cushion body 7 carried by two mutually parallel mounting brackets 6 for supporting the back of the head of a person on the rear seat. Each bracket 6 forms a rounding section R flanking the upper edge of the rear seat backrest, which merges into an insertion section 6 '.

The rear seat headrest is carried by a headrest holder 8. This has two bracket-like support elements 9, 10 arranged next to one another, from which retaining webs 11, 12 and 13, 14 are angled. In the side view, two retaining webs 11, 12 and 13, 14 complement each other to form a U-shape. This Retaining bars 11 to 14 serve to fix the headrest bracket to the backrest frame, not shown.

The support element 10 is provided in the area of the holding web 14 with an electromotive gear 15. By means of the same, a drive shaft 16 mounted in the support elements 9, 10 can be set in rotation. A U-shaped mounting bracket 17 is penetrated by the drive shaft 16. The U-web supports a ring gear 18 which meshes with a bevel gear 19 which is fixed on the drive shaft 16. The ring gear 18 is non-rotatably seated on one end of a spindle 20 having an external thread. The latter passes through a spindle nut 21, which is designed as a sleeve-shaped support body. The ends of the spindle nut 21 extend between the mounting brackets 22 of a U-shaped pivot bearing 23. Its pivot axis 24 is seated in the support elements 9, 10. When the gear 15 is initiated, the drive shaft 16 is rotated, which rotates the spindle 20 via the bevel gear , At the same time, depending on the direction of rotation, the spindle nut 21 is displaced in one direction or the other while pivoting the pivot bearing 23 about the pivot axis 24.

As illustrated in FIG. 5, a spring 80 designed as a torsion spring is seated on the pivot axis 24. The winding paths of the spring encompass the pivot axis 24. One leg 80 'is supported on the side of the retaining web, while the other leg 80 ", which is longer, is supported against a projection 81 of the pivot bearing 23. The spring thus counteracts the weight of the headrest when it is moved into its hidden position.

In the two ends of the sleeve-shaped spindle nut 21 form-fitting pins 25, 26 are inserted, which reach through the bearing tabs 22 and protrude beyond them. The free ends of the form-fitting pins 25, 26 extend as far as the retaining web 14 or 11 facing them. With the form-fitting pins 25, 26 cooperate mountings 27, 28. These are also mounted on the swivel axis 24. A continuous insertion shaft 29 is provided in each holder receptacle 27, 28 for receiving the associated insertion section 6 'of the bracket 6. The distance between the insertion shafts 29 corresponds to the distance between the mounting brackets 6. Each insertion shaft 29 forms radially recessed free spaces F running in the longitudinal direction. These are delimited by radially projecting webs 30 running in the longitudinal direction.

From the wall 31 of the mounting receptacles 27, 28 facing the form-fitting pin 25, 26 there is a groove 32 each which intersects the insertion shaft 29. With this groove 32, a form-fitting recess 33 of the insertion section 6 ^{1 is} aligned, so that a form-locking position securing can be achieved by the form-fitting pins 25, 26. For this purpose, the holder receptacles 27, 28 are spring-biased on the pivot axis 24 in the direction of abutment against the form-fitting pins 25, 26. The spring preload results from one on the pivot axis 24 between the holder receptacle 27, 28 and the facing bearing bracket 22 seated torsion spring 34. One end 34 'is supported on a bend 35 of the bearing bracket 22, while the other end 34 "is supported on a transverse bore 53 of the holder receptacle 27, 28. In the area between the holder receptacle 27 and the transmission 15 there is an electronic one Component-containing circuit board 36 is provided by means of which the respective position of the mounting receptacles 27, 28 can be registered, for example by means of sensory detection, in order to achieve an electrical line connection, a plug shaft 37 with the corresponding contacts is also arranged adjacent to the electrical transmission 15.

Between the retaining web 11 and the holder receptacle 28, a mounting lever 38 is mounted about the pivot axis 24. The latter is made from a sheet metal blank bent into a substantially U-shaped design. The mounting lever 38 accordingly has a web 39 with legs 40, 41 angled therefrom. The leg 40 flanks the facing broad side wall of the mounting receptacle 28. In the region of the groove 32, the end of the leg 40 is provided with an angled bearing shell 42, which fits in a form-fitting manner immerses a stepped section 26 'of the form-fitting pin 26, see in particular FIG. 8. The force of the springs 34 holds the bearing shell 42 and thus also the mounting lever 38 in its position.

The other leg 41 is also equipped with a bend 43. A cut-out window 44 is located there. One end 45 ′ of a return spring 45 seated on the pivot axis 24 is supported on the narrow window edge. The other end 45 ″ of the return spring 45 is pretensionedly supported on the web 39 of the mounting lever 38. This mounting lever is therefore used in addition to a form-fitting pin for form-fitting securing of a mounting bracket 6.

The force of the return spring 45 is dimensioned such that it is greater than the spring force acting on the mounting receptacles, that is to say the force of the torsion springs 34.

As shown in FIG. 1, the cushion body 7 contains a drive 60 shown with hidden lines. With regard to the same, it can be an electric motor, which is assigned to the end of the one mounting bracket 6 via a toothed drive (not shown). By initiating the drive 60, the cushion body 7 can accordingly be displaced in the height direction illustrated by arrows, so that the headrest is expanded by an additional degree of freedom. The following mode of action occurs:

1 to 8, the pivot bearing 23 assumes a 0 ° position via the spindle drive. At the same time, the mounting receptacles 27, 28 supported by the form-fitting pins 25, 26 are also in a 0 ° position, which corresponds to the position of use of the headrest.

When the rear seat is not occupied in order to allow a better view of the driver to the rear, the rear seat headrest 5 steers into a hidden position, the cushion body 7 moving into a recess 46 in a parcel shelf 47, see dash-dotted representation in FIG. 1. This control can done automatically or initiated by the driver. An intermediate position according to FIGS. 9 to 11 occurs during this control. The pivot bearing 23 has rotated about 90 ° about the pivot axis 24 via the spindle drive. This movement also make the bracket receptacles 27, 28 due to their spring loading. As shown in FIG. 10, the end 45 'of the return spring 45 has also come into contact with the retaining web 11. In the 90 ° position of the holder receptacles 27, 28, the cushion body 7 is received by the trough 46 of the hat support 47. Along with the displacement of the rear seat headrest into the hidden position, the spring 80 is tensioned or charged via the projection 81 of the pivot bearing 23. The torque resulting from the weight of the headrest counteracts the moment of the spring 80, so that the drive 15 essentially has to overcome the friction in the adjustment mechanism. Accordingly, the drive 15 can be dimensioned relatively weak and space-saving. The spring 80 acting in the manner of an energy store supports the pivoting displacement when the rear seat headrest is pivoted from the hidden position into the use position, so that only little force is required for this. After the cushion body 7 is received by the trough 46 of the hat support 47, the spindle drive continues its adjustment while the pivot bearing 23 is pivoted further about the pivot axis 24. Because of the larger dimension Return spring 45 relative to the torsion springs 34 accordingly the form-locking pins 25, 26 come into a spaced position from the mounting brackets 6. However, the mounting lever 38 remains due to the tensioned return spring 45 with its bearing shell 42 in engagement with the associated mounting bracket 6, cf. 12 to 14. The position indicated in FIG. 1 can now be brought about, in which the seat 2 is folded over. Then the rear seat backrest 3 has to be folded down. Due to the return spring 45, the headrest 5 can be moved into a position that can be pushed over in the final phase of the folding over of the backrest 3, so that the headrest 5 has also shifted by approximately 125 °, compare FIGS. 15 to 17.

If the headrest 5 is in its hidden position and a person takes a seat on the rear seat 2, the headrest 5 shifts into the position of use, which is done, for example, in connection with the seat occupancy with the belt lock actuation. The headrest is displaced by means of the spindle drive, namely by rotating the drive shaft 16 in the opposite direction.

To a certain extent, the headrest can be adjusted automatically or manually in the position of use. If an automatic adjustment of the headrest is desired, it is advisable to provide a drive 60 within the cushion body 7. This can be an electric motor, which allows the cushion body 7 to be adjusted in the direction of the arrow shown in FIG. 1 via a worm and toothed drive (not shown). An extended position of the cushion body 7 is shown with dash-dotted lines. If a person sitting in the rear seat leaves his or her seat, the seat 60 can be used to give the drive 60 the impulse to move the cushion body 7 back into its basic position. This is necessary if the wasting is then ken of the upholstered body in the hidden position. However, both movements can also overlap.

If the headrest 5 is to be separated from the rear seat backrest, starting from the position of use, the spindle drive is to be initiated such that when the headrest is held in place, the pivot bearing 23 with the associated form-fitting pin 25, 26 is only displaced by a few angular degrees, which is illustrated in Figs. 18 and 19. The positive connection to the insertion sections 6 'of the mounting bracket 6 is thereby eliminated, so that the mounting bracket 6 can be pulled out of the mounting receptacles 27, 28.

Load forces occurring in the position of use on the headrest 5 are guided via the mounting bracket 6 into the form-fitting pin 25, 26 into the spindle nut 20 and pivot bearing 23, which forces are absorbed by the support elements 9, 10 via the pivot axis 23. The electric motor drive 15 therefore remains unaffected by any high stresses.

A different design of the headrest is illustrated in FIG. 20. The cushion body 7 is pivotally connected to the bracket 6. Furthermore, the cushion body 7 is spring-biased into a stop position. For this purpose, a spring 48 is used, which acts on a stop bracket 49. The latter is supported on a pivot stop 50 on the backrest side. In the course of the movement of the headrest 5 by means of the spindle drive, an individual adjustment of the cushion body 7 can then be carried out.

According to the second embodiment according to FIGS. 21 and 22, the support frame is designated by the number 82. The pivot bearing 23 can be displaced about the pivot axis 24 thereof. As in the first embodiment, the displacement can take place via a spindle drive (not shown). The pivot bearing 23 is the carrier of one of the holder receptacles 27, 28 assigned positive locking pin 25, 26. In addition, the spring 80 designed as a torsion spring sits on the pivot axis 24. The turns of this spring 80 wrap around the pivot axis 24. One spring leg 80 'is supported on the support frame 82, while the other spring leg 80 "in the sense of a acts in the clockwise direction of torque on the pivot bearing 23.

If the rear seat headrest is pivoted from the position of use illustrated in FIG. 21 into the hidden position according to FIG. 22, the weight G in FIG. 22 is counteracted by the spring 80. Accordingly, this also works like an energy storage spring. This means that in this embodiment too, the spring 80 has a supportive effect when the headrest is returned from the hidden position into the use position. This leads to the advantage that in this case too, the drive essentially only has to overcome the friction in the adjustment mechanism.

The torque / angle of rotation diagram according to FIG. 23 shows that the spring torque resulting from the spring 80 in any case exceeds the torque resulting from the weight force over part of the swivel path. The torque curve of the spring is designated with the letter Oi, while the torque curve D ₂ , resulting from the weight of the headrest, is slightly below Di. This measure can prove to be of advantage in the case of a longer period of use, since a certain decrease in the spring effect naturally occurs.

According to the third embodiment shown in FIGS. 24 to 29, the headrest holder is designated by the reference number 90. This is punched out of sheet metal and bent into the appropriate shape. A mounting recess 91 is formed on the holder 90, which serves for the insertion of the drive shaft 16, which is open on one side and on which the electromotive gear 15 acts. Due to the loosely inserted drive shaft 16, which over the bevel gear (not specified) drives the spindle 20, this is mounted with play in relation to the holder 90, which allows installation tolerances to be compensated for.

Then the bracket 90 is the carrier of the pivot axis 24 about which the

Swivel bearing 23 is displaceable by pivoting. In opposition to the pivot bearing 24, the pivot bearing 23 receives the form-fitting pins 25, 26, which in turn interact with the mounting receptacles 27, 28.

According to this version, a spring 92 operating as an energy storage spring is also provided. The overall course of the same is, as it is particularly shown in FIGS. 26 and 27, U-shaped, consisting of the U-web 92 'and the two U-legs 92 ". FIG. 27 shows that the U-web 92' is about three times the size of the U-leg 92 ". The U-web 92 'is enlarged in terms of the active spring length by a loop guide. The loop S in question is essentially designed as an obtuse-angled triangle, the hypotenuse facing the U-web 92 '.

The U-legs 92 "near the kink to the U-web 92 'each have a shape 92'" with which they partially enclose the form-fitting pin 25, 26 surrounding sleeve 93. The rotation lock of the spring 92 is achieved by the loop S. The loop S lies against the holder 90. A cover 94 extends over the loop S. To secure the cover 94, a fastening screw (not shown) can be used, which engages in a threaded bore 95 of the headrest holder 90. On the way there, the loop S is penetrated by the fastening screw.

As can be seen from FIG. 24, in the position of use of the headrest there is a play between the U-legs 92 ″ and the pivot bearing 23 in front. This means that when the headrest is folded into the hidden position, the legs 92 "are only acted upon after this movement play has been completed, after which the charging of the energy store begins as in the previously described embodiment. When the headrest is returned from the hidden position to the position of use then supporting the charged energy storage spring 90, so that this version also realizes that the drive only has to essentially overcome the friction of the adjustment mechanism.

However, there is also the possibility that, in the position of use of the headrest, the U-legs 92 ″ already rest against the pivot bearing 23.

All of the features disclosed are (in themselves) essential to the invention. The disclosure content of the associated / attached priority documents (copy of the prior application) is hereby also included in full in the disclosure of the application, also for the purpose of including features of these documents in claims of the present application.

Claims

EXPECTATIONS

1. rear seat headrest (5) with adjustment mechanism for motor vehicles, the headrest (5) from a position of use in a hidden position using a weight due to a weight of the headrest acting on a pivot axis (24) and in any case from the hidden position to the use position can be moved by a motor, characterized in that a spindle drive (20, 21) is provided for moving the headrest (5).

2. rear seat headrest according to claim 1 or in particular according thereto, characterized in that the weight of the headrest (5) is counteracted by a spring (80, 92).

3. Rear seat headrest according to one or more of the preceding claims or in particular according thereto, characterized in that the spring torque (Di) resulting from the spring (80, 92) in any case over a part of the swivel path the moment resulting from the weight (D ₂ ) exceeds.

4. rear seat headrest according to one or more of the preceding claims or in particular according thereto, characterized in that the spring (80, 92) is a torsion spring and / or a torsion bar and / or a tension spring and / or a compression spring.

5. rear seat headrest according to one or more of the preceding claims or in particular according thereto, characterized in that the spring (80) is wound around the pivot axis (24).

6. Rear seat headrest according to one or more of the preceding claims or in particular according thereto, characterized in that the spin del drive (20/21) acts on the headrest (5) at a transverse distance to the swivel axis (24).

7. rear seat headrest according to one or more of the preceding claims or in particular according thereto, wherein the headrest (5) has mounting bracket (6), characterized in that the mounting bracket (6) by means of positive locking pins (25, 26) are secured in position and that the spindle drive (20/21) acts on the bracket (6) by means of the positive locking pins (25, 26).

8. rear seat headrest according to one or more of the preceding claims or in particular according thereto, characterized in that the spindle drive has a spindle nut (21) in which the form-fitting pins (25, 26) are also fastened.

9. rear seat headrest according to one or more of the preceding claims or in particular according thereto, characterized in that the form-fitting pin (25, 26) in the hidden position in a spaced position to the bracket (6) are controllable.

10. Rear seat headrest according to one or more of the preceding claims or in particular according thereto, characterized in that the headrest (5) or its bracket (6), for example when folding the backrest (3) on which the headrests (5) are attached, can be pivoted further in the direction of the positive locking pins (25, 26).

11. rear seat headrest according to one or more of the preceding claims or in particular according thereto, characterized in that the further pivoting takes place against the force of a return spring (45).

12. rear seat headrest according to one or more of the preceding claims or in particular according thereto, characterized in that the bracket (6) in the holder receptacles (27, 28) are inserted.

13. rear seat headrest according to one or more of the preceding claims or in particular according thereto, characterized in that the mounting receptacles (27, 28) on the swivel axis (24) are spring-biased in the direction of contact with the form-fitting pin (25, 26).

14. rear seat headrest according to one or more of the preceding claims or in particular according thereto, characterized in that the force of the return spring (45) is greater than that acting on the mounting receptacles (27, 28) spring force.

15. rear seat headrest according to one or more of the preceding claims or in particular according thereto, characterized in that the mounting receptacles (27, 28) form insertion shafts (29) for the mounting bracket (6), which insertion shafts (29) radially recessed, extending in the longitudinal direction Have free spaces (F).

16. rear seat headrest according to one or more of the preceding claims or in particular according thereto, characterized in that a mounting lever (38) is provided, which is used in addition to a form-locking pin (26) for form-locking securing a bracket (6).

17. rear seat headrest (5) according to one or more of the preceding claims or in particular according thereto, wherein the headrest (5) has a cushion body (7) which is pivotally connected to the bracket (6), characterized in that the cushion body ( 7) is spring biased into a stop position and that in the course of the procedure of Headrest (5) of the cushion body (7) can be adjusted by resting on a swivel stop (5).

18. Rear seat headrest (5) with adjustment mechanism for motor vehicles, the headrest (5) can be triggered automatically from a position of use into a hiding position and pivotable about a pivot axis (24) and can be brought into the position of use from the hidden position, characterized in that the cushion body (7) the headrest (5) can be moved separately by means of a drive (60).

19. Rear seat headrest according to claim 18 or in particular according thereto, characterized in that an electric motor forming the drive (60) for moving the cushion body (7) is arranged within the latter.

20. rear seat headrest according to one or more of the preceding claims or in particular according thereto, characterized in that a movement of the headrest (5) into the hidden position is only possible when the cushion body (7) is in its starting position.

21. rear seat headrest according to one or more of the preceding claims or in particular according thereto, characterized in that the spring (92) is U-shaped in its overall course.

22. Rear seat headrest according to one or more of the preceding claims or in particular according thereto, characterized in that the U-web

(92 ') is greater in length than the U-leg (92 ").

23. rear seat headrest according to one or more of the preceding claims or in particular according thereto, characterized in that the U-web (92 ') is increased by a loop guide with regard to the active spring length.

24. Rear seat headrest according to one or more of the preceding claims or in particular according thereto, characterized in that the spring

(92) is secured against rotation in the area of the loop (S).

25. Rear seat headrest according to one or more of the preceding claims or in particular according thereto, characterized in that the spindle (20) is mounted with play in relation to the headrest holder (90).

26. Rear seat headrest according to one or more of the preceding claims or in particular according thereto, characterized in that the headrest (5) pivots together with the holder.

27. rear seat headrest according to one or more of the preceding claims or in particular according thereto, characterized in that the spindle nut is driven relative to the stationary spindle.

28. Rear seat headrest according to one or more of the preceding claims or in particular according thereto, characterized in that an insertion section (6 ') is secured in position by a securing spring arranged on the holder receptacle (27, 28).

29. Rear seat headrest according to one or more of the preceding claims or in particular according thereto, characterized in that the securing spring can be displaced in a motor-assisted manner into a release position.