Title: Seat backrest having an adjustable lumbar support

Abstract: A seat backrest having an upholstered cushion portion supported by a rigid frame portion includes means to produce a desired supporting contour in the lumbar region of the seat occupant. The contour-producing means includes a lumbar pad, resiliently biased pivoted arm members connecting the lumbar pad to the frame through a toggle linkage, and handle means operable from the side of the backrest for adjustably positioning the lumbar pad in a plurality of fixed positions forward of the frame.

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Other info:

Inventors: Arndt, O. Harold (Milwaukee, WI, US)
Wilton, William L. (Waukesha, WI, US)

Application Number: 973200
Filing Date: 1978-12-26
Publication_date: 1980-01-08
Assignee: UOP Inc. (Des Plaines, IL)
Primary Class(es): 297/284.4
Other Classes:
US Patent Ref:

2550831	May, 1951	Lingenfelter	297/284.
3550953	Dec, 1970	Neale	297/284.
3565482	Feb, 1971	Blodee	297/284.
3807794	Apr, 1974	Beyer	297/284.
3948558	Apr, 1976	Obermeier et al.	297/284.

Other Refs:
Primary Examiner: Zugel, Francis K.
Assistant Examiner:
Attorney: Hoatson, Jr.; James R., Clark; Barry L., Page, II; William H.