| 摘要 |
Synchronisation mechanism for chairs or armchairs, of the type provided with a base ( 1 ), on which at least one seat frame ( 2 ) and at least one backrest frame ( 3 ) are hinged, at least one stiffening spring ( 4 ) positioned between the base and the backrest frame, in addition to a device for adjusting the stiffness of the above-mentioned spring comprising means ( 5, 6, 7, 8, 9, 10 ) to move one end ( 15 ) of the spring with respect to its other end ( 16 ). The above-mentioned means to move one end of the spring with respect to its other end comprise at least one cam element ( 5 ) hinged ( 6 ) to the base, so that the cam element acts, directly or indirectly, on the end ( 15 ) to be moved of the spring, the other end ( 16 ) of the spring being linked to the backrest frame.
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