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A seat such as an office chair has at least two gas spring units for performing different functions such as adjusting the angles of inclination of the backrest portion and the seat portion of the chair. The gas spring units are operated by a common operating lever having an operating handle at one e

A seat such as an office chair has at least two gas spring units for performing different functions such as adjusting the angles of inclination of the backrest portion and the seat portion of the chair. The gas spring units are operated by a common operating lever having an operating handle at one end while at its second end it is carried in a vertical slot so as to be pivotable in a horizontal direction about the vertical axis of the slot and slidable lengthwise of the slot. At a location spaced from its second end the lever is mounted in a horizontal slot so as to be pivotable in a vertical direction about the axis of the horizontal slot as well as being slidable lengthwise of the horizontal slot, whereby different spring units can be actuated by different combinations of movements of the lever.

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Seat adjustment apparatus disposed beneath a seat for adjusting the position of said seat comprising a first gas spring unit for adjusting said seat in a first manner on actuation thereof, a second gas spring unit for adjusting said seat in a second manner upon actuation thereof, common operating le

Seat adjustment apparatus disposed beneath a seat for adjusting the position of said seat comprising a first gas spring unit for adjusting said seat in a first manner on actuation thereof, a second gas spring unit for adjusting said seat in a second manner upon actuation thereof, common operating lever means including a first end and a second end, said second end of said common operating lever means including gripping means, first mounting means mounting said common operating lever means at a first location thereon and second mounting means mounting said common operating lever means at a second location thereon, said common operating lever means having a first portion and a second portion, said first portion of said common operating lever means being slidably displaceable in said first mounting means while said second portion of said common operating lever means pivots about said second mounting means, and said second portion of said common operating lever means being slidably displaceable in said second mounting means while said first portion of said common operating lever means pivots about said first mounting means whereby said first gas spring unit may be actuated in response to said slidable displacement of said common operating lever means in said first mounting means and said second gas spring unit may be actuated in response to said slidable displacement of said common operating lever means in said second mounting means.