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US 5,088,790 AGranted
Adjustable lumbar support mechanism for a vehicular seat
AssigneeLear Seating Corporation
InventorsJohn C. Wainwright, Arduino Colasanti
Life of this patent
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AssigneeLear Seating Corporation
InventorsJohn C. Wainwright, Arduino Colasanti
Estimating the term…
An adjustable lumbar support mechanism (20) includes a screw shaft (36) having spaced apart right hand (38) and left hand (40) thread convolutions. A traveling nut (42, 44) is disposed in coacting engagement with each of the right hand (38) and left hand (40) threads for linear movement in opposite directions along the screw shaft (36). A pair of links (50, 58) are pivotally attached to each other and at opposite ends to each of the traveling nuts (42, 44) such that movement of the nuts (42, 44) along the screw shaft (36) laterally displaces the links (50, 58). A pressure applicator (68) is attached to the links (50, 58) by a universal joint connection (66). The screw shaft (36) extends outwardly from the seat (22) to an external hand crank (106). The assembly is disposed in a vehicular seat (22) such that movement of the pressure applicator (68) causes an alteration in the contour of the lumbar region (28) of the seat (22) thereby providing adjustable lumbar support.
An adjustable lumbar support assembly (20) of the type disposed within a seat backrest (24) for altering the contour of the backrest (24) to provide lumbar support, said assembly (20) comprising:
An adjustable lumbar support assembly (20) of the type disposed within a seat backrest (24) for altering the contour of the backrest (24) to provide lumbar support, said assembly (20) comprising:
Dependencies are inferred from the claim text.