Chairs and seats – Back movement resiliently opposed in operating position – Back and bottom adjust in a fixed relationship
Patent
1988-07-10
1989-12-26
Dorner, Kenneth J.
Chairs and seats
Back movement resiliently opposed in operating position
Back and bottom adjust in a fixed relationship
297304, 297326, 248575, A47C 300
Patent
active
048893846
ABSTRACT:
A knee-action chair control for a pedestal chair base comprises a base plate, a seat support plate pivotally mounted on the front of the base plate, a pair of compression springs operable between the plates for biasing the seat support plate toward an at-rest position relative to the base plate, and a novel adjustable spring preload mechanism operable between the base plate and one end of the compression springs. Additonally, there is an assembly locking plate removably mounted on the seat plate and engageable with the base plate for determining the at-rest position of the seat plate. Removal of the assembly locking plate during assembly of the control enables the compression springs and spring preload mechanism to be assembled without precompression of the springs.
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Sketch of Herman Miller Co. Knee-Action Chair Control.
Chen José V.
Dorner Kenneth J.
Leggett & Platt Incorporated
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