Tilt back chair and control

Details Tilt back chair and control Tilt back chair and control

A - Human Necessities

47

C

A47C 1/024 (2006.01) A47C 1/032 (2006.01) A47C 7/00 (2006.01) A47C 7/14 (2006.01)

Patent

CA 2070592

A tiltable chair has a base, a vertical post, a seat, a back and a chair control. The chair control comprises a housing attached to the vertical post, a resilient biasing means mounted in the stationary housing for biasing the chair in an upright position, a seat support structure, a back support structure and a back frame member. The seat support structure is pivotally connected to the housing at a pivot axis aligned over the vertical post. The back support structure is pivotally connected to the seat support structure at an axis forward of the vertical post. One end of the back frame member supports the back support structure while a mid-portion is interconnected to the seat support structure and the opposite end is pivotally attached to the housing to provide both differential tilting of the seat and back and correlated differential vertical movement for ergonomic comfort and to avoid "shirt pull." A spring mount assembly comprising compression springs compressed between the front portion of the seat and the seat support structure provides resilient but flexible seat support. A base cover assembly comprises top and bottom fairings which form a friction fit with the base and which also snap fit together to provide a smooth, attractive appearance.

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