초록 ▼

A mechanical device for synchronous movement of a seat and a backrest of a chair comprising a first supporting bracket which is associated with a central column which protrudes from a rotating base and is pivoted transversely to an end of a second fixing bracket for the seat. The second bracket coop

A mechanical device for synchronous movement of a seat and a backrest of a chair comprising a first supporting bracket which is associated with a central column which protrudes from a rotating base and is pivoted transversely to an end of a second fixing bracket for the seat. The second bracket cooperates with two pairs of slotted laminar elements which are pivoted to the first bracket. A third anchoring bracket for the backrest is also provided which is pivoted to the first bracket and to a pair of linkages which are in turn pivoted to the second bracket. Moreover, a piston is present between the third and first brackets and a pair of springs is present between the first and second brackets.

대표청구항 ▼

[ What is claimed is:] [1.] A mechanical device for the synchronous movement of a seat and a backrest of a chair, comprising a first supporting bracket for attachment to a central column which protrudes from a rotating base and is pivoted transversely to an end of a second fixing bracket for attachm

[ What is claimed is:] [1.] A mechanical device for the synchronous movement of a seat and a backrest of a chair, comprising a first supporting bracket for attachment to a central column which protrudes from a rotating base and is pivoted transversely to an end of a second fixing bracket for attachment of said seat and which cooperates with two spaced apart pairs of slotted laminar elements which are pivoted to said first bracket and comprising a third anchoring bracket for attachment of said backrest, wherein said third bracket is pivoted to said first bracket and to a pair of linkages which are in turn pivoted to said second bracket, a piston being interposed between said third and first brackets, and a pair of helical compression springs being interposed between said first and second brackets.