JPH0310323B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a height-adjustable headrest for a motor vehicle seat, in which two guide rods assigned to the lateral end regions of the headrest frame are fixed to the headrest frame. The guide rod engages with a guide provided on a vertical frame stay that constitutes the backrest frame of the automobile seat together with the connecting stay, and an electric motor is fixed to the backrest. relates to a type of adjusting drive which drives, via a transmission, a toothed member arranged on a shaft.

In the height-adjustable head rest of the type known from Japanese Utility Model Publication No. 47-7684,
A rope is fixed to both guide rods at their lower ends and is wound around an internal common rope drum located between the longitudinal beams. A worm gear is arranged on the rope drum, and a drive worm with a vertical axis meshes with the worm gear. The drive worm is mounted on the output shaft of a drive motor located below the worm. When one or the other rope stretches or shortens, a tilting moment acts on the guide rod, which risks locking it in the guide, since both ropes have different free lengths. It is extended by being wound around the rope drum at different positions off-center between the two guide rods.

The object of the invention is to provide a height-adjustable headrest of the type mentioned at the outset, in which a lock-free height adjustment is guaranteed with simple means.

The problem to be solved by the present invention is defined in claim 1 or 6.
The problem was solved by the headrest described in Section 9 or Section 10.

In the height-adjustable head rest according to the present invention, the adjustment member engages the central portion of the side stay;
This ensures that the force exerted by the adjusting member on the central part is evenly distributed on both guide rods.

The electric motor can in principle be mounted in any position and operation of the guide rod without any tilting of the guide rod is ensured.

The invention will now be explained with reference to the drawings: FIGS. 1 to 3 show a first embodiment of a height adjustment device 10. FIG. The headrest 12 and the backrest 14 of the vehicle seat which are to be adjusted by the height adjustment device 10 are shown in broken lines. Backrest 1
The front side of 4 is located on the right side when viewed in FIG. Therefore, FIG. 1 corresponds to a rear view of the backrest 14.

The backrest 14 is reinforced by a backrest frame 16. Two parallel frame stays 18 extend in the longitudinal direction of the backrest, i.e. in the headrest 12.
and the original seat. The frame stay 18 is a molded metal plate with high bending resistance,
It has a U-shaped cross section with outwardly bent legs. Both frame stays 18 are connected to two connecting stays 20 spaced apart in the longitudinal direction of the backrest.
are connected to each other by. The connecting stay 20 is a thin metal plate portion welded to the frame stay 18. To increase rigidity, shaped stays (see, for example, FIG. 12) may be used instead of the flat connecting stays shown in cross-section in FIG. 2.

The headrest 12 is held by two guide rods 22 guided within the backrest 14. One of the guide rods 22 is guided to each frame stay 18 so as to be movable in the longitudinal direction of the backrest. For this purpose, two mutually spaced guide sleeves 24 are attached to the frame stay 18 and fixed, for example by spot welding. A guide rod 22 with a circular cross section can be slid into the guide sleeve 24 . Thereby, the headrest 12, which is connected to the guide rod 22, can be adjusted to different height positions.

The guide rod 22 and the frame stay 18 are curved and recessed into an arc with a radius of curvature R of 1 m when viewed from the front side of the backrest. This curvature approximately corresponds to the curvature of the upper half of the human spine. The headrest 12, guided along a suitable trajectory by the guide rod 22, can therefore be adjusted to an anatomically correct position for both small and large users.

The height adjustment of the headrest 12 takes place by means of an electrical adjustment drive 26. The electric adjusting drive 26 is an electric motor 28 with a transmission 30.
It is composed of a screw cable drive device 32. Electric motor 28 is directly flanged to transmission 30 . The transmission 30 is fixed to a retaining plate 36 via a threaded joint 34. This retaining plate 36 itself is welded to one side of the frame stay 18 (welded contact point 38). Transmission cover 4
0 is fixed to the transmission 30 via a screw 42.

The threaded cable drive 32 has a guide tube 44 in which a threaded cable 46 with high tension and compression resistance is guided so as to be movable in the longitudinal direction but not to rotate.

The guide tube 44 is fixed to the backrest frame 16 via a fixing plate 48 which is fixedly screwed to both coupling stays 20 using screws 50. The guide tube 44 is point-welded to the fixed plate 48 (welded point 59). The screw cable 46 is connected to the guide rod 22 and thus to the headrest 12. For this purpose, the end of the guide rod 22 remote from the headrest 12 is rigidly inserted into a fixing sleeve 54 . A transverse stay 56 is welded to both fixing sleeves 54 and forms a rigid connection between the two guide rods 22 . Both guide rods 22
A driving body 58 is screwed to the horizontal stay 56 through a screw 60 between the two. This driver 58 engages in a slot 62 cut in the guide tube 44 in the area between the connecting stays 20. As can be seen in FIG.
is surrounding. In this case, the driver 58 is press-fitted onto the screw cable 46 in a fixed manner. However, there is also play between the driver 58 and the guide tube 44, so that the driver 58 together with the threaded cable 46 can be moved unhindered inside the guide tube 44. Horizontal stay 56 of the driving body 58
The double range extending perpendicular to the threaded cable 4
6 and the horizontal stay 56. As already mentioned, the guide rod 22 is guided along an arcuate trajectory. Entrainment body 5 that draws a corresponding arc trajectory
The guide tube 44 is also suitably curved in order to allow the guide tube 44 to move unhindered. The radius of curvature R' of the guide tube 44 is approximately the same as the radius of curvature R of the guide rod 22.

Screw cable 46 is driven within transmission 30 by a pinion 66 (shown in phantom in FIG. 1). That is, the screw cable 46 is moved in the cable longitudinal direction (arrow X in FIG. 1). The direction of rotation of pinion 66 is indicated by arrow Y.

By operating the electric motor 28, the screw cable 46 is connected to the guide tube 44 via the pinion 66.
The head rest 12 is moved via the driver 58. electric motor 28
Starting operation can be accomplished by a simple changeover switch on the seat or instrument panel.

FIGS. 4 and 5 show an electrical adjusting drive 2.
6', 26'' is shown. Parts that are the same as in FIGS. 1 to 3 have been given the same reference numerals.

The electric adjusting drive 26' with the screw cable drive 32' is extremely robust since the displacement movement is provided via a nut 100 screwed onto the screw cable 46. screw cable 4
The load of the nut 100 on the tooth side of No. 6 can be kept low by using a nut 100 with suitably large winding conditions. Natsu 100
is shown partially in section in FIG. The nut is rotatably mounted within the transmission 30'. In this case, the neck 33' at the lower end of the nut in FIG.
0', and a collar 37' at the upper nut end retains the ball bearing 31'. The outer race of this ball bearing 31' is press-fitted into the transmission 30'. ball bearing 3
1' is fixed to the nut 100 by a snap spring 39'. The nut 100 is provided with an internal thread 41' in the area of the collar 37'. This inner screw 4
1' is matched to the thread of the threaded cable 46. There is a nut 10 between the collar 37' and the neck 33.
0 is provided with a toothed section 43' of enlarged diameter and toothed on the outer periphery. This toothed section 4
3' meshes with a drive pinion 45' schematically shown in FIG. The drive pinion 45' is driven by an electric motor 28 which is flange-connected to the transmission 30'.

The guide tube 44 is interrupted by a transmission 30'. In order to secure the guide tube section 47' which extends downwardly from the transmission 30' in FIG. 4, the transmission 30' is provided with a fixing sleeve 49'.

The transmission 30' is fastened to the backrest frame 16 via a retaining plate 36' which is point-welded to the frame stay 18. A transmission 30' is fixed to this holding plate 36' via screws 34'.

The electric adjustment drive 26'' in FIG. 5 is replaced by a screw cable drive 3 with a nut-driven screw cable 46 as in FIG.
However, the nut 41'' shown in FIG. '' together with the anchor winding 53'' are mounted rotatably and movably in the axial direction against the spring force in the stator 55'' of the electric motor 28''. The upper end of the anchor shaft coupled to is provided with a ball bearing 57". This ball bearing 57"
1'' prevents it from moving in the axial direction on the anchor shaft 51''. The ball bearing 57'' is guided within the bearing casing 63'' so as to be movable in the axial direction of the anchor shaft 51''.
7'', and thus a disc spring set 65'' which fixes the anchor shaft 51'' in a central position.The lower end of the anchor shaft 51'', which is not shown in FIG. 5, is movable in a similar manner. is supported by. In this way, shock loads which are applied to the threaded cable 46 during operation, for example when starting and stopping the motor, are absorbed elastically. This allows the adjusting drive 2
6. Damage, especially to the electric motor 28'', is significantly reduced.

The bearing housing 63'' consists of two housing halves 67'' and a sliding bush 69'' of the ball bearing 57''. The casing halves 67'' project on both sides of the front plate 71'' of the electric motor 28''.
The front plate 71″ is a cylindrical motor casing 7
It is fixed to the 3" collar 72". The electric motor 28'' is fastened to one of the frame stays 18 via a two-part holding plate 36'' which grips the motor casing 73''. In this case, the lower part 36''a shown in FIG. is point welded to the frame stay 18, and has a screw hole 75'' for fixing the upper portion 36''b. The adjusting drive 26'' shown in FIG. 5 operates particularly compactly and reliably due to the direct connection of the electric motor 28'' and the nut 41'.

6 and 7, an adjustment drive 326, which is another embodiment of the present invention, is shown. code 16
, a backrest frame that reinforces the backrest (not shown) is shown. This backrest frame 1
Two parallel vertical frame stays 18 of 6 extend in the longitudinal direction of the backrest frame 16.

The frame stay 18 is a molded metal plate with high bending resistance and has a U-shaped cross section with outwardly bent legs. Both frame stays 18 are connected to each other by two connecting stays 20 spaced apart in the longitudinal direction of the backrest. The connecting stay 20 is a thin metal plate portion welded to the frame stay 18. To increase rigidity, shaped stays may be used instead of the flat connecting stays shown in FIG.

It is held by two guide rods 22 guided within the headrest and backrest frame 16 (not shown). One of the guide rods 22 is guided to each frame stay 18 so as to be movable in the longitudinal direction of the backrest. Thereby, the headrest 12, which is connected to the guide rod 22, can be adjusted to different height positions.

The height adjustment of the headrest 12 is effected by an electrical adjustment drive 326. The electrical adjustment drive 326 is connected to the Bowden cable drive 302.
The Bowden cable drive 302 has an intermediate transmission 3 which is driven via a flexible drive shaft 369 by an electric motor (not shown).
It is equipped with 30. A gear 368 is attached to the drive shaft 369.
A worm gear 367 that rotates is non-rotatably coupled. Coupled to gear 368 is a cable drum 370 around which cable 304 is wound. Cable 30 from cable drum 370
4 first passes through the Bowden cable sleeve 306 at the bottom right of FIG. has been returned to.

The deflection rollers 308 and 310 are rotatably mounted on a sheet metal press part 314 or 316, respectively. The Bowden cable sleeve 306 or 321 is connected to the thin plate pressed part 314 or 31
6 via a fixing piece 318 or 320. The upwardly bent edges 322 or 324 provide the sheet press parts 314 and 316 with the necessary bending strength. Thin plate press part 314
and 316 are point welded to the ends of the molded rail 327, so that an easy-to-handle assembled unit is obtained from the intermediate transmission 330, the Bowden cable sleeves 306, 312, the molded rail 327 and the sheet metal press parts 314, 316. It will be done. In this case, cable 304 is already attached.

The molded rail 327 is fastened on each side to a connecting bracket 20 via connecting members (not shown). bowden cable sleeve 30
6 and 312 are flexible, the fixing location of the intermediate transmission 330 can be chosen relatively freely. The force is transmitted to the guide rod 22 through the cable 304 and the fixed sleeve 54 of the guide rod 22.
This is done by means of both fixed entrainment members 328 with transverse stays 356 fixed on. As can be seen in FIG. 7, the entraining member 328 consists of cable nickel which is press-fitted to the cable 304 in a fixed manner. This cable nipple is connected to two retaining plates 331 that protrude downward from the horizontal stay 356.
The cable is held stationary so that it does not move in the direction of the cable. The holding plate 331 can be formed, for example, by a thin plate tongue piece cut out from the plane of the horizontal stay 356 and bent out. This creates two openings 332 in the lateral stay 356, as shown in FIG.

A cross section of molded rail 327 is shown in FIG. The cross section is U-shaped, with the leg ends bent outwards. A first plastic slider 334 is attached to the molded rail 327 in order to guide the transverse stay 356 along the molded rail 327.
(Fig. 7 left) is fixed. The plastic slider 334 grips the unbent leg of the U-shaped molded rail. Second and third plastic sliders 33 fixed to horizontal stays 356
6 or 338 grips the bent end of the leg. This is because the horizontal stay 356 is attached to the molded rail 32.
7 in the longitudinal direction, i.e. in the direction of the cable.

Holding plate 331 and plastic slider 33 for fixing the entraining member 328 (cable nipple)
4,336,338 may be attached to special members. In this case, this member is the horizontal stay 35
Combined with 6. If the guide rod 22 is guided so as to be movable along an arc, the forming rail 327 must also be bent into an arc shape accordingly.

Adjustment drive 526 shown in FIGS. 8 and 9
In this case, a rack drive 502 is used. Rack 504 is secured at one end to a connecting stay 520 that connects frame stay 18.
A horizontal stay 556 welded to both guide rods 22 is connected to a rack pinion 506 driven by a motor.
is held. The rack and pinion 506 engages the rack 504 so that the guide rod 22 is movable relative to the frame stay 18 in its longitudinal direction.

An intermediate transmission device driven by a drive motor (not shown) is fixed to the lower side of the horizontal stay 556 via a flexible drive shaft 569. A worm gear 567 that drives a gear 568 is non-rotatably coupled to the drive shaft 569 . Gear 568 is coupled to the upper side of cross stay 556 along with rack and pinion 506. Rack 504
is the holding member 5 in the same way as the rack and pinion 506.
Covered by 08. This holding member 508 is attached to the side stay 508 so as to extend laterally with respect to the rack.
56 with screws 510. Glued to the upper side of the rack 504 is a sliding strip 512 made of plastic with sliding properties. This sliding strip 512 has a retaining member 50
A sliding head 514 made of plastic with sliding properties is fixed on the inside of the head 8 and comes into contact with it. Therefore, the guide rod 504 is moved by the horizontal stay 556 with small friction.
You will be guided along the When the guide rods 22 are movable along an arc, as shown in FIG. It rotates slightly around the axis (X in Figure 8). In order to eliminate the mechanical stress due to this pivoting movement, another sliding head 516 can be provided on the opposite side of the rack 504 from the sliding head 514, which is fixed to the transverse stay 556. A further sliding strip 517 can likewise be attached to the sliding head 516 side of the rack 504. During the pivoting movement, the fully elastic sliding heads 514, 516 are slightly deformed for this purpose. This rotational movement caused by the coupling stay 52
In order to be able to operate unhindered even at zero, the upper end of the rack 504 is supported via a ball-and-socket joint 518 on a connecting stay 520. Ball joint 51
8 consists of a ball head 519 supported on a ball support part 522 made of plastic with low friction. The ball bearing portion 522 is fixed to the coupling stay 520 by a snap spring 524. The joining stay 520 has double bent portions (folded edges 525) at both ends.
The central range of the connecting stay 520 is located at approximately the same height as the horizontal stay 556.

In FIG. 10, a rack drive 502' is used similar to the adjusting drive 526 shown in FIG. 8, so that a particularly robust and reliable adjusting drive 526' is shown. There is. Rack 50
4' as well as the bearing point of the drive pinion 506' are reversed compared to the rack drive 502. That is, the rack 504' has a cross stay 556' that connects the guide rod 22 at its upper end in FIG.
The rack pinion 506' is fixed to the connecting stay 520' which connects the frame stay 18.
is supported by.

The rack and pinion 506' forms part of an intermediate transmission 530' which is connected via a flexible drive shaft 569' to a drive motor (not shown). Rack 504' is held in meshed position with rack pinion 506' by pin head 524'. In this case, the pin head 524' extends within a longitudinally extending slot 527' of the rack 504'. The pin head 524' covers the side edge of the elongated hole 527', and the rack 504' covers the side edge of the elongated hole 527'.
Prevents undesired departure from 0'.
A rack 504' is rotatably supported on the lower side of the horizontal stay 556' facing the frame stay 18 via a pivot shaft 528'. In this case, the pivot axis 52
The axis of 8' lies perpendicular to the frame plane defined by the frame stays 18 (the plane of view of FIG. 10). The pivot shaft 528' is the guide rod 2
It is supported in the elongated hole 531' so as to be movable in the direction of the interval 2. Central range 55 of horizontal stay 556'
8' is shifted forward from the frame plane through two double bends (bend lines 560') at the ends of the transverse stays, and the transverse stays 556' are directed downwardly and along the connecting stays 520'. It is designed to be moved. In this case, rack 504',
Pin head 524 and rack pinion 506 are located between transverse stay 556' and coupling stay 520'.

The rack 504 is provided with rack teeth on its left side longitudinal side 532' perpendicular to the frame plane and on its right side 534' in FIG. An end surface 53 extending in a semi-cylindrical shape from the upper end of the rack 504'
6' is likewise provided with a lock tooth. This rack tooth joins the rack teeth on both longitudinal sides 532' and 534'. This continuous rack tooth 53
8', the rack pinion 506' has all the rack teeth 53
8' can be rolled and always have easy teeth 53.
8' and is aligned with the elongated hole 527' so as to be electrically coupled with the elongated hole 527'.

In FIG. 10, the uppermost position of the transverse stay 556' (and thus the headrest) is shown. When the drive motor is moved to lower the headrest, the pinion 506'
Rotate in the direction shown in Figure 0. This pinion 5
06', the rack 504' is connected to the pin head 52
4' is moved downward in the direction of arrow Y until it reaches the upper end of elongated hole 527'. Then easy 5
04' begins to rotate in the direction of arrow Z about the pin head 524'. An intermediate position 540' of rack 504' is shown in phantom. During this pivoting movement, the pivot shaft 528' is guided around the pin head 524' in a semicircular manner. The radius of this arc is defined by the axial spacing between pin head 524' and pivot shaft 528' at this position. In other words, this radius corresponds to the minimum distance a=8 between the axes of the pin head 524' and the pivot shaft 528' shown in FIG.
Equivalent to mm. The length of slot 531' must therefore be chosen such that pivot axis 528' can be moved to the right in FIG. 10 by a distance a.
Due to the arcuate movement of the pivot shaft 528', the transverse stay 526' and thus the headrest are moved downwardly without interruption during the pivoting movement of the rack. Easy 50 after turning 180°
The pivoting movement of 4' is completed. The pinion 506' meshes with the teeth on the other longitudinal side 532' and the rack 506'
4' is moved downward together with the horizontal stay 556'. The lowest position is obtained when pin head 524' reaches the end of slot 527' remote from pivot axis 528'. If the headrest is raised again, the movement sequence is reversed. The described rack drive 502' has the advantage of being particularly compact in construction.

11 and 12 show the spindle drive device 6.
02 is shown. The threaded spindle 604 is fixed at one end via a ball joint 618 to a connecting stay 620 that is welded to the frame stay 18 . Ball joint 61
8 is a ball support portion 6 fixed to the opening of the coupling stay 620 via a ball head 619 and a snap spring 624.
22 (Fig. 12). Ball head 6
19 is integrally connected to a sleeve 627 into which the upper end of the threaded spindle 604 is inserted. A pin 628 passing laterally through the sleeve 627 and the threaded spindle 604 connects the threaded spindle 604 to the sleeve 6.
Fixed within 27. The function of ball joint 618 corresponds to that of ball joint 518 in FIG.

An intermediate transmission device 630 is fixed to a horizontal stay 656 that connects the guide rod 22 with a screw 632. The flexible drive shaft 669 is connected to the intermediate transmission 630
is coupled to a drive motor (not shown). The drive shaft 669 has teeth 636 of a spindle nut 638.
A gear 634 that meshes with is non-rotatably coupled. Spindle nut 638 is threaded spindle 6
04 on the thread 640. Drive shaft 6
One rotation of 69 is the thread 6 of the threaded spindle 604.
40, turn the spindle nut 638 once. The screw spindle 604 is connected to the connecting stay 620
Rotation of spindle nut 638 moves spindle nut 638 along threaded spindle 604, which in turn moves guide rod 22 with the headrest.

In order to slightly pivot the threaded spindle 604 relative to the horizontal stay 656 when the movement path of the guide rod 22 is curved in an arc shape, the intermediate transmission device 6 is used.
30 is rotatably supported on a horizontal stay 656 accordingly.

FIGS. 13 and 14 show an adjusting drive 6 with a somewhat modified spindle drive 602'.
26' is shown. In this case, the spindle nut 638' is non-rotatably supported about the nut axis. In contrast, the threaded spindle 604' is rotated by an intermediate transmission 630'. Moreover, since the threaded spindle 604' is supported at both ends, the stability of the device is increased. The upper end of the threaded spindle 604' in FIG. 13 is rotatably supported in a bearing bush 660'. The bearing bush 660' is welded to the connecting stay 620' which is welded to the frame stay 18. The threaded spindle 604' and the lower end are non-rotatably connected via a safety pin 662' inside the intermediate transmission 630' with a slotted gearwheel 636'. Gear 636' meshes with another gear 634' which is non-rotatably coupled to flexible drive shaft 669'. The intermediate drive 630' is connected in a driving manner via a drive shaft 669' to a drive, which is not shown. Intermediate transmission 630'
is fixed to the connecting stay 620' via a screw 631'. The lateral stay 656', which connects the guide rod 22, has a bent edge (FIG. 14) to increase rigidity, and a spindle nut 638' has a long hole.
They are connected via a pin joint 664'. For this purpose, a flat holding plate 666' is attached to the spindle nut 638' and extends in the direction of the spindle axis. This holding plate 666' is provided with an elongated hole 668' extending radially with respect to the spindle axis. A pin 670' is passed through the elongated hole 668' and is fixedly supported by two support plates 672' connected to both sides of the holding plate 666'. The support plate 672' is immovably fixed to the horizontal stay 656'. Pin 670' is held in position by snap spring 673' (FIG. 13).
As described, the elongated hole-pin joint 664' allows the spindle nut 638' to perform a pivoting movement about a pivot axis parallel to the spacing of the guide rods 22, or to change the spacing relative to the transverse stay 656'. Make it. The relative movement of the spindle nut 638' with respect to the transverse stay 656', which occurs when the guide rod 22 moves along an arc, therefore takes place unhindered. Spindle drives 602 and 602'
is designed to have a self-locking action to prevent automatic adjustment of the headrest.

[Brief explanation of the drawing]

The drawings show several embodiments of the invention, in which FIG.
Figure 2 is a cross-sectional view taken along the line A-A in Figure 1, Figure 3 is a detailed view taken along the line B-B in Figure 1, and Figure 4 is a diagram showing the second embodiment. Figure 5 showing an example
The figure shows the third embodiment, FIG. 6 shows the fourth embodiment, FIG. 7 is a sectional view taken along line E-E in FIG. 6, and FIG. 8 shows the fifth embodiment. FIG. 9 is a sectional view taken along the line F-F in FIG. 8, FIG. 10 is a diagram showing the sixth embodiment, FIG. 11 is a diagram showing the seventh embodiment, and FIG. 12 is a sectional view taken along line GG in FIG. 11, FIG. 13 is a view showing the eighth embodiment, and FIG. 14 is a sectional view taken along line HH in FIG. 13. 10... Height adjustment device, 12... Headrest, 14... Backrest, 16... Backrest frame,
18... Frame stay, 20... Combined stay,
22... Guide rod, 24... Guide sleeve, 26,
26', 26''... Adjustment drive, 28... Drive motor, 30, 30'... Transmission, 32, 32'...
...Screw cable drive device, 34...Screw joint, 3
6... Holding plate, 38... Welding contact, 40... Transmission device cover, 42... Screw, 44... Guide tube, 46
... Screw cable, 48 ... Fixing plate, 50 ... Screw, 52 ... Welding contact, 54 ... Fixing sleeve, 5
6...Horizontal stay, 58...Driving body, 60...Screw, 62...Slit, 66...Pinion, 10
0...Nut, 302...Bowden cable drive device, 304...Cable, 306...Bowden cable sleeve, 308...Direction changing roller, 31
0...Direction changing roller, 312...Bowden cable sleeve, 314, 316...Thin plate press part,
318, 320... fixed piece, 322, 324...
Edge, 326... Adjustment drive, 327... Forming rail, 328... Entraining member, 330... Intermediate transmission, 331... Holding plate, 332... Opening, 33
4,336,338...Plastic slider,
356...Horizontal stay, 367...Worm gear,
368... Gear, 369... Drive shaft, 370...
Cable drum, 502...Rack drive device, 5
04...Rack, 520...Connection stay, 526
... Adjustment drive, 530 ... Intermediate transmission, 5
56...Horizontal stay, 568...Gear, 569...
Drive shaft, 602...Spindle drive device, 604
...Screw spindle, 618 ...Ball joint, 620
...Connection stay, 626...Adjustment drive device, 62
7... Sleeve, 630... Intermediate transmission device, 63
2... Screw, 634... Gear, 636... Teeth, 6
38...Spindle nut, 640...Screw thread,
656...Horizontal stay, 669...Drive shaft.

Claims (1)

Claims: 1. A height-adjustable headrest for a motor vehicle seat, the headrest having a headrest frame with two lateral end areas, the upper end of a guide rod 22 being attached to the headrest frame. is fixed, said guide bar 22 being guided in a guide element 18 which together with at least one connecting stay 620' forms a backrest frame and is arranged in the backrest cushion of the motor vehicle seat, said guide Bar 22
The lower ends are connected to each other by transverse stays 656, in whose central region an adjustment drive 630 for adjusting the height of the headrest is engaged, which adjustment drive 630 is connected to the backrest frame. Driven by a fixed electric motor, the adjustment drive is arranged substantially parallel to the guide rod 22, which is non-rotatably mounted in the central region of the coupling stay 620 at its upper end. It consists of an extending threaded spindle 604 and a spindle nut 638 rotatably mounted in the central region of the transverse stay 656 and surrounding the threaded spindle 604, the spindle nut 638 being a flexible motor driven by the electric motor. Drive shaft 6
A height-adjustable headrest for a motor vehicle seat, characterized in that it is driven by an input member 634 attached to the free end of the seat. 2 Spindle nut 63 of adjusting drive 630
The input member 634 for driving 8 is a first gear 634 coaxially fixed to the free end of said flexible drive shaft 669 , said gear 634 being a first gear 634 coupled to a spindle nut 638 . 2. The headrest according to claim 1, wherein two gears 636 are meshed with each other. 3. The head rest according to claim 2, wherein the first gear 634 is supported in parallel with the axis of the second gear 636. 4. The first claim, wherein the threaded spindle 604 is pivotally fixed to the coupling stay 620.
The headrest described in any one of paragraphs 3 to 3. 5. The headrest according to claim 4, wherein the threaded spindle 604 is pivotally fixed to the coupling stay 620 via a ball joint 618. 6. A height-adjustable headrest for a motor vehicle seat, in which the headrest has a headrest frame with two lateral end regions, to which the upper end of the guide rod 22 is fixed; The guide rod 22 connects the upper and lower connecting stays 6
20 forming a backrest frame and guided within a guide member 18 disposed within the backrest cushion of the automobile seat, the lower ends of the guide rods 22 being connected to each other by a transverse stay 656';
An adjustment drive 630' for adjusting the height of the headrest is engaged in the central region of the transverse stay 656', the adjustment drive 630' being driven by an electric motor fixed to the backrest frame. The adjustment drive is connected to the upper connecting stay 62.
0' and a lower connecting stay 620', a threaded spindle 604' extending substantially parallel to the guide rod 22 and rotatably supported on the lower connecting stay 620';
a spindle nut 638' mounted non-rotatably in the central region of the shaft 56' and surrounding the threaded spindle 604', the threaded spindle 604' being connected to a flexible drive shaft 669' driven by the electric motor. A height-adjustable headrest for a motor vehicle seat, characterized in that it is driven by an input member 634' mounted at its free end. 7 Spindle nut 638' is attached to horizontal stay 65
7. A headrest according to claim 6, wherein the headrest is pivotably fixed to 6'. 8 Spindle nut 638' is attached to horizontal stay 65
Claim 6 is fixed to the transverse stay 656' so as to be movable transversely to the axis of the 6'.
Headrest as described in section. 9. A height-adjustable headrest for a motor vehicle seat, in which the headrest has a headrest frame with two lateral end regions, to which the upper end of the guide rod 22 is fixed, The guide rod 22 is guided in a guide member 18 which together with at least one connecting stay 20 forms a backrest frame and is arranged in the backrest cushion of the motor vehicle seat, the lower end of the guide rod 22 being arranged laterally. are connected to each other by stays 356, in the central region of which is engaged an adjustment drive for adjusting the height of the headrest;
The adjustment drive is adapted to be driven by an electric motor fixed to the backrest frame, and the adjustment drive is connected to at least one coupling stay 20.
a shaped rail 326 arranged approximately parallel to the guide rod 22 and fixed in the central region of the adjusting cable 3 surrounded by the shaped rail 326;
04, the adjustment cable 304 is connected to the horizontal stay 356 via a driving member 328, and the sliding/guiding members 334, 336, 338 attached to the horizontal stay 356 are connected to the side of the molded rail 326. Grasping the edges, the transverse stay 356 is guided along the molded rail 326 and the adjustment cable 304 is connected to an input member 367 attached to the free end of a flexible drive shaft 369 driven by an electric motor. A height-adjustable headrest of a motor vehicle seat, characterized in that it can be adjusted and moved via an intermediate transmission 330. 10. A height-adjustable headrest for a motor vehicle seat, the headrest having a headrest frame with two lateral end regions, to which the upper end of the guide rod 22 is fixed, The guide rod 22 forms a backrest frame together with at least one connecting stay 520 and is guided in a guide member 18 arranged in the backrest cushion of the motor vehicle seat, the lower end of the guide rod being connected to the transverse stay. 556, in the central region of which is engaged an adjustment drive for adjusting the height of the headrest;
It is provided that the adjusting drive is driven by an electric motor fixed to the backrest frame, and that the adjusting drive extends approximately parallel to the guide rod 22, which is mounted in the central region of the coupling stay 520. Also, the rack 504 has teeth directed to one side.
and a horizontal stay 55 that meshes with the teeth of the rack 504.
and a gear 556 supported on the gear 5.
56 is engaged by an input member 567 attached to the free end of a flexible drive shaft 569 driven by an electric motor.