Chair with seat spring mechanism

Details Chair with seat spring mechanism Chair with seat spring mechanism

A - Human Necessities

47

C

155/49, 155/22.3

A47C 3/28 (2006.01) A47C 3/025 (2006.01) A47C 3/026 (2006.01) A47C 7/40 (2006.01) A47D 1/00 (2006.01)

Patent

CA 1250218

ABSTRACT The seat (27) of a chair is pivotally connected to its carrying arm (14) by means of a horizontal shaft (42) disposed at the front edge of the seat. The arm (14) is mounted on a supporting frame (12) extending behind the seat (27) and can be adjusted thereon to various heights. A spring mechanism is provided, the energy accumulating means of which is a helical spring. The pre-stressing of the helical spring can be adjusted depending on the user's body weight so that the seat (27) is held in suspension by the spring mechanism (F) within a middle range of the pivot angle. Thus, the user can effect a comparatively strong rocking motion of the seat (27) by relatively small shift of the centre of gravity while unintentional rocking movements are avoided to a large degree. (Fig. 3)

494301

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