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US 4,632,454 AGranted
Vehicle seat intended, for example, for such automobile vehicles as cars, trains and airplanes
AssigneeAB Volvo
InventorMichel S. Naert
Life of this patent
Estimating the term…
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AssigneeAB Volvo
InventorMichel S. Naert
Estimating the term…
The invention relates to a seat intended, for example, for automobiles, trains or airplanes, having a back-rest, in which there is arranged a lumbar-support device whose rigidity can be adjusted by turning a wheel mounted on a shaft journalled in the back-rest, and the vertical setting of which can be adjusted by vertically displacing the wheel with subsequent pivoting of the shaft. The lumbar support device comprises a horizontally elongated sheet of flexible material that is bodily vertically displaceable by vertically displacing the wheel, and whose rigidity is adjusted upon turning the wheel by moving toward or away from each other the opposite horizontal edges of the sheet thereby to cause the sheet to bow outwardly to a greater or lesser extent. Turning the wheel winds a filament on the shaft to effect this latter adjustment.
A vehicle seat having a back-rest having therein a lumbar support device in the form of a horizontally elongated rectangular flexible plate, means mounting the plate for vertical movement as a whole relative to the back-rest and for maintaining the plate in any of a plurality of vertically adjusted positions relative to the back-rest, and means for selectively moving opposite horizontal edges of the plate toward and away from each other thereby to cause the plate to bow forwardly outwardly to a greater or lesser extent.
Dependencies are inferred from the claim text.