| 摘要 |
<p>A device for adjusting the degree of preload of springs in office chair mechanisms which comprise at least two parts hinged together and elastic means ( 30 ) maintaining said parts elastically spaced apart, said device being characterised by comprising: -a first element ( 36 ) provided with at least one inclined surface ( 40 ) and coupled to one of the parts (to the elastic means), -a second element ( 42 ) provided with at least one appendix interacting with the inclined surface ( 40 ) of the first element, and coupled to the elastic means (to one of the parts), -means ( 46,48 ) for inducing axial rotation of one of said elements, means ( 54, 56 ) for blocking the rotation of the other element.</p> |
