Adjustable backrest for the seats of vehicles, particularly cars

Details Adjustable backrest for the seats of vehicles, particularly cars Adjustable backrest for the seats of vehicles, particularly cars

1989-12-22

1991-06-25

Brown, Peter R.

Chairs and seats

Bottom or back with means to alter contour

297460, A47C 746

Patent

active

050261169

ABSTRACT:
A backrest for vehicle seats includes an inverted U-shaped support frame having an upper cross bar, two side arms and a cross bar interconnecting the lower ends of the side arms. A shaft is rotatably mounted on said support frame parallel to and adjacent the cross bar and a plurality of flexible elements extending generally vertically in side-by-side relation are connected at their upper ends to a first transverse element secured to the support frame and a lower transverse element which is connected to a pair of tensioning elements. The tensioning elements extend beneath the cross bar and upwardly over the guide bar extending between the side arms in the vicinity of the upper curved portion of the flexible elements which have an S-shaped configuration. A spacer cross member is disposed in engagement with the flexible elements in the vicinity of the upper curve and the upper ends of the tensioning elements extend over the guide bar and are connected to the spacer cross member. Radial arms are provided on the shaft which engage the tensioning elements so that upon rotation of the shaft the tensioning elements will exert a transverse force on the upper curvature of the flexible elements to vary the curvature of the flexible elements.

REFERENCES:
patent: 4316631 (1982-02-01), Lenz et al.
patent: 4354709 (1982-10-01), Schuster
patent: 4452485 (1984-06-01), Schuster
patent: 4627661 (1986-12-01), Ronnhult

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