| 摘要 |
Device to adjust the height of a backrest (13) of a chair (11), which comprises a support structure (15) provided with a guide channel (25; 127) through which a support element (14; 114) solidly associated with the backrest (13) is free to slide. The device comprises an interference element (27, 28; 127) provided with an interference surface (33; 151) and at least an actuation member suitable to act on the interference element (27, 28; 127) in order to determine a condition of interference between the interference surface (33; 151) and the support element (14; 114) and to allow the selective adjustment of the height of the backrest (13).
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