Chairs and seats – Movable back – Tiltable
Patent
1999-06-01
2000-12-12
Cuomo, Peter M.
Chairs and seats
Movable back
Tiltable
29736211, 297330, B60N 212
Patent
active
061588113
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns an adjustment device for a vehicle seat having a back and a seat part formed by a seat substructure and a seat cushion with a side part and which is guided longitudinally by tracks, which can selectively regulate the seat part with respect to height, tilt or longitudinal distance wherein the adjustment device is formed of at least one planetary gear system which is positionally fixed, for example on the seat sub-assembly, on the side part or on the seat track, and is provided in a drive gear housing, which planetary gear system comprises at least one sun gear, at least on planet pinion as well as at least one ring gear, wherein the at least one sun gear in acted upon by rotation drive means for operation of the adjustment device.
2. Description of the Related Art
It is generally known that the seats in modern vehicles are adjustable with respect to multiple parameters to thereby provide an ergonomically comfortable seating position for the person seated thereupon. Therein it is of particular consequence to adjust, besides the adjustment position of the seat back, the adjustment of the seating surface, that is, the seat part with the seat cushion, in the length, height and tilt.
An adjustment device of the above described type is generally known from DE-OS 28 36 005, which shows the kinematics of the seat adjustment as well as the associated adjustment elements, which work in cooperation with the individual seat components. A seat substructure is connected to the vehicle chassis via front and rear pivotably coupled pivotable levers and is adjusted in height by appropriate tilting of these pivot levers. On this seat substructure a carrier part is provided, on which at the front at least one knuckle joint is coupled for tilt adjustment of the side part, of which the other end is connected with a seat part. The whole seat unit is guided on a track mounted on the vehicle floor and is longitudinally adjusted by means of a rack in engagement with an associated pinion or a spindle with a spindle nut.
In order to adjust the seat in height, torque is applied in the conventional manner to a linkage point of the 4-point-kinematic a torque is applied by means of a by a tooth segment of a pinion rotating about the linkage-rotating-point.
The same operating principle is employed by as rule for tilt adjustment, for this a further lever is employed at the front besides the 4-point-kinematic or by configuration of a 5-kinematic.
An adjustment device with the above described characteristics, that is, with adjustment means for adjusting the longitudinal, height and tile positions of a vehicle seat, is known from U.S. Pat. No. 4,765,582. Herein each adjustment means engages both sides of the vehicle seat and has either a lever mechanism for the manual operation or respectively one electrically operated adjustment means for each side and adjustment device.
The adjustment devices are respectively comprised of an intermediate or reduction gear and a planetary gear, each of which are provided with four planet pinions, which are secured to a planet pinion carrier and which are in engagement with an associated sun gear. The intermediate or reduction gears are respectively driven by flexible shafts from an assigned electro-motor provided below the corresponding seat, that is, the assigned drive motor acts upon two adjustment devices. This sets a minimal size for the motors. Further, a simple conversion from manual operation to motor operation is not possible, rather it requires a complete change-out of the adjustment devices. This is on the one hand expensive and on the other hand requires the stockpiling of extra spare parts.
Beginning with this state of the art it is the object of the present invention to provide an adjustment device for a vehicle seat of the above described type for the longitudinal-, height- and tilt adjustment thereof, which is simple to operate and which operates reliably both by means of manual operation as well also electro-motor an
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Breitfeld Uwe
Burger Joerg
Hofschulte Wolfram-N.
Burger Soehne GmbH & Co.
Cuomo Peter M.
IMS Morat Soehne GmbH
White Rodney B.
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