Lumbar support regulating apparatus

Details Lumbar support regulating apparatus Lumbar support regulating apparatus

1977-10-31

1979-07-31

Zugel, Francis K.

Chairs and seats

Bottom or back with means to alter contour

267 89, A47C 746

Patent

active

041628071

ABSTRACT:
A vehicle seat of the type having a seat back with a plurality of transverse serpentine springs therein is provided with a regulating apparatus for adjusting the firmness of the lower most springs to adjust the firmness of the seat back in the lumbar region. A torsion spring is wrapped about a vertically extending post in the lower corner of the seat back with the ends thereof operatively engaged with a lumbar plate engaging the seat spring adjacent the lower center portion of the seat back and with an intermediate portion of the spring extending outwardly from the post in engagement with a rotatable cam having surfaces of different radii engagable with the intermediate portion of the spring to vary the force of the torsion spring on the seat spring.

REFERENCES:
patent: 3031164 (1962-04-01), Schopf
patent: 3285562 (1966-11-01), Langer
patent: 3378299 (1968-04-01), Sandor
patent: 3659819 (1972-05-01), Wolters
patent: 3973797 (1976-08-01), Obermeier et al.
patent: 4019777 (1977-04-01), Hayashi

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