Chair, particularly office chair

Chairs and seats – Back movement resiliently opposed in operating position – Back and seat adjust simultaneously

Patent

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Details

297301, 297302, 297304, A47C 300

Patent

active

051219689

ABSTRACT:
A chair, particularly an office chair, comprises a chair column, a seat lower frame supported on the chair colunm in a height-adjustable manner and rotatable relative to a vertical axis, a seat support supported on the seat lower frame turnably about a horizontal axis, a backrest support supported on the seat lower frame turnably about a horizontal axis, at least one spring with adjustable tensioning and supported on the seat lower frame and the backrest support, an adjustable abutment provided for the pressure spring, a control curve against which the adjustable abutment abuts, and an adjusting element arranged to displace the control curve.

REFERENCES:
patent: 2471024 (1949-05-01), Cramer
patent: 2894563 (1959-07-01), Simons et al.
patent: 3042448 (1962-07-01), Hamilton

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