Chairs and seats – Bottom or back with means to alter contour
Patent
1990-05-21
1992-02-18
Brittain, James R.
Chairs and seats
Bottom or back with means to alter contour
297460, A47C 300, A47C 2500
Patent
active
050887904
ABSTRACT:
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.
REFERENCES:
patent: 4295681 (1981-10-01), Gregory
patent: 4657304 (1987-04-01), Heesch et al.
patent: 4678230 (1987-07-01), Winkle
patent: 4940284 (1990-07-01), Nagasaka
patent: 4981324 (1991-01-01), Zacharkow
Colasanti Arduino
Wainwright John C.
Brittain James R.
Gardner James M.
Lear Seating Corporation
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