Vehicle seat with mechanical lumbar support having two degrees o

Details Vehicle seat with mechanical lumbar support having two degrees o Vehicle seat with mechanical lumbar support having two degrees o

1986-07-11

1988-02-16

Aschenbrenner, Peter A.

Chairs and seats

Bottom or back with means to alter contour

297460, A47C 746

Patent

active

047250950

ABSTRACT:
A vehicle seat with a mechanism in the back of the seat which provides support for the lumbar region of the back of the seat occupant, the mechanism being mechanically adjustable to vary the magnitude of the support provided the occupant's back. The mechanism is characterized by the fact that it provides two degrees of freedom to adapt the mechanism to a particular seat occupant thereby providing the desired user comfort. The mechanism consists of a support member mounted on linkage so that the support member is moveable in and out in a direction laterally of the seatback to provide one degree of freedom and is pivotally moveable about an axis extending transversely of the seatback to adapt the slope of the support to the slope of the occupant's back to thereby impart the second degree of freedom. The seatback suspension springs fasten to the lumbar linkage to prevent discontinuities in back support from developing at any position of the lumbar system. The support member is assymmetrically pivoted and spring loaded to bias the lumbar support to its upper portion and thereby provide some upper torso support. A control cam is specifically configured to enable easy adjustment of the first degree of freedom and the seat occupant is moveable in the seat to achieve the second degree of freedom.

REFERENCES:
patent: 3106423 (1963-10-01), Schwarz
patent: 4159847 (1979-07-01), Arai
patent: 4162807 (1979-07-01), Yoshimura
patent: 4296965 (1981-10-01), Sakurada et al.
patent: 4449751 (1984-05-01), Murphy et al.
patent: 4576410 (1986-03-01), Hattori
patent: 4588172 (1986-05-01), Fourrey et al.
patent: 4623193 (1986-11-01), Lieker

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