Chairs and seats – Back movement resiliently opposed in operating position – Back and seat adjust simultaneously
Patent
1984-01-11
1987-03-24
Zugel, Francis K.
Chairs and seats
Back movement resiliently opposed in operating position
Back and seat adjust simultaneously
297304, 297316, A47C 300
Patent
active
046520503
ABSTRACT:
A chair tilt mechanism (100) includes a support casting (110) mounted to a chair spindle (104) and a seat casting (130) having a chair seat (102) mounted thereon. A pair of elongated forward links (150) and a pair of triangular shaped rear links (160) are pivotably connected to both the seat casting (130) and support casting (110). A slidably mounted spring yoke (210) includes a front vertical portion (212) interconnected between rearwardly extending arms (214) which are pivotably connected to the rear links (160). As the seat casting (130) is tilted, the links (160) pivot away from an initially biased position and the spring yoke (210) compresses a coiled outer spring (200). A concentric coiled inner spring (202) is provided to increase the spring rate in the event that the outer spring (200) is compressed a certain degree. In a second embodiment, the springs are compressed by the movement of the front links rather than the rear links.
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Herman Miller Inc.
Zugel Francis K.
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