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An adjustable work chair such as an office chair has a height-adjustable seat comprising a front seat part ( 2 ) and a rear seat part ( 3 ) connected by a hinge ( 4 ) that extends transversely of the seat. A first arm ( 15 ) is coupled between the front part of the seat and the head of a fixed part

An adjustable work chair such as an office chair has a height-adjustable seat comprising a front seat part ( 2 ) and a rear seat part ( 3 ) connected by a hinge ( 4 ) that extends transversely of the seat. A first arm ( 15 ) is coupled between the front part of the seat and the head of a fixed part ( 13 ) of a seat lift ( 14 ), and a second arm ( 16 ) is coupled between an extendable piston of the lift ( 14 ) and the underside of the rear part ( 13 ) of the seat.

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1. A chair having a height-adjustable seat comprising a front seat part ( 2 ) and a rear seat part ( 3 ) connected by a hinge ( 4 ) that extends transversely of the seat, the chair further comprising: a lift ( 14 ) for raising and lowering the seat, the lift including a fixed part ( 13 ) and a movab

1. A chair having a height-adjustable seat comprising a front seat part ( 2 ) and a rear seat part ( 3 ) connected by a hinge ( 4 ) that extends transversely of the seat, the chair further comprising: a lift ( 14 ) for raising and lowering the seat, the lift including a fixed part ( 13 ) and a movable part ( 8 ) that can be extended upwardly with respect to the fixed part ( 13 ); a first arm ( 15 ) connected between the front part ( 2 ) of the seat and the fixed part ( 13 ) of the lift, and a second arm ( 16 ) connected between the movable part ( 8 ) of the lift and the rear part ( 3 ) of the seat. 2. A chair as claimed in claim 1, wherein the first arm ( 15 ) is coupled to the fixed part ( 13 ) of the lift at a rotational joint ( 16 ). 3. A chair according to claim 1, wherein the fixed part ( 13 ) of the lift comprises a centre column ( 1 ) supporting the seat, and wherein the first arm ( 15 ) is firmly connected to an upper end portion ( 12 ) of the centre column ( 1 ). 4. A chair according to any one of claims 1 to 3, wherein the first arm ( 15 ) is coupled to the front part ( 2 ) of the seat by a guide mechanism ( 18 ). 5. A chair according to any one of claims 1 to 3, wherein the lift comprises a gas spring ( 7 ) having an extendable piston ( 8 ) including a head ( 9 ) which is coupled by a joint to said second arm ( 10 ) that extends to the rear part ( 3 ) of the seat. 6. A chair having a height-adjustable seat comprising a front seat part ( 2 ) and a rear seat part ( 3 ) connected by a hinge ( 4 ) that extends transversely of the seat, the chair further comprising: a first arm ( 15 ) connected at a joint to the front part ( 2 ) of the seat, and a second arm ( 10 ) connected to the rear part ( 3 ) of the seat at a joint ( 20 ) containing toothed segments, the two arms ( 10 , 15 ) being coupled on a common shaft ( 27 ) to a centre support column ( 1 ) of the chair and including a spring element ( 28 ) permitting adjustment of the arms ( 10 , 15 ) with respect to each other. 7. A chair according to claim 6, wherein the common shaft ( 27 ) including the spring element ( 28 ) is coupled to the centre column ( 1 ) by way of a pinion ( 31 ) that engages a toothed rack ( 32 ) on the top ( 12 ) of the centre column ( 1 ). 8. A chair having a height-adjustable seat comprising a front seat part ( 2 ) and a rear seat part ( 3 ) connected by a hinge ( 4 ) that extends transversely of the seat, the chair further comprising a first arm ( 35 ) coupled to the front part ( 2 ) of the seat at a joint, and a second arm ( 41 ) coupled to the rear part ( 3 ) of the seat, the first arm ( 35 ) being coupled to a centre column ( 1 ) of a seat support and being directed forward at an angle of approximately 60°; a spring element ( 39 ) being coupled to the first arm ( 35 ) intermediate the ends of the arm and having a piston rod ( 40 ) coupled to the underside of the rear part ( 3 ) of the seat at an axis ( 25 ) of a joint coupling; said second arm ( 41 ) being coupled to the front part ( 2 ) of the seat at a joint ( 17 ) on axis ( 25 ) by way of a guide mechanism. 9. A chair having a height-adjustable seat comprising a front seat part ( 2 ) and a rear seat part ( 3 ) connected by a hinge ( 4 ) that extends transversely of the seat, the chair further comprising a first arm means ( 35 ) pivotally coupled to the front part ( 2 ) of the seat, and a second arm means ( 35 ) being coupled to a centre column ( 1 ) of a seat support and being directed forwardly towards the front part ( 2 ) of the seat; and actuator means coupled between the first arm means ( 35 ) and the rear part ( 2 ) of the seat for raising and lowering the rear part of the seat between a normal seating position, an elevated sit/stand position, and a reclined position, wherein the second arm means comprises a parallelogram mechanism connected between the rear part of the seat and the first arm means and including a pair of links that cause the rear part of the seat to move betwe en the seated position and the elevated sit/stand position while remaining parallel, the mechanism including section gear means at the ends of the links, adapted to modify motion of the rear part of the seat in moving to said reclined position so that said rear seat part angles downwardly with respect to its orientation in said seated position.