| 摘要 |
A synchronous office chair comprising a support ( 1 ) firmly connected with a supporting column, a seat base ( 2 ) articulated on a tilting axis ( 4 ) support with a flange ( 5 ) and a backrest ( 3 ) with a back bracket ( 6 ). The back bracket ( 6 ) features a first, second and third cam tracks ( 7, 8 , and 9 ) and engages in an interstice between support ( 1 ) and seat base ( 2 ). Said seat base ( 2 ) with flange ( 5 ) and backrest ( 3 ) with back bracket ( 6 ) are formed to execute a synchronous movement. A first roller bearing ( 10 ) is mounted on flange ( 5 ) of seat base ( 2 ) that engages in the first cam track ( 7 ) of back bracket ( 6 ) and in which the synchronous movement is guided in first cam track ( 7 ). A second roller bearing 11 is mounted on seat base ( 2 ) that engages in second cam track ( 8 ) of back bracket ( 6 ) and in which synchronous movement is guided in second cam track ( 8 ). A third roller bearing ( 12 ) is mounted on support ( 1 ) that engages in third cam track ( 9 ) of back bracket ( 6 ) and in which synchronous movement is guided in third cam track. A synchronous movement takes place such that the seat base ( 2 ) with flange ( 5 ) execute a first tilting movement about a tilting axis ( 4 ), whilst backrest ( 3 ) with back bracket ( 6 ) execute a second tilting movement about a virtual axis ( 13 ). Based on the magnitude it is about two to three times as large as the first tilting movement and a translational movement at the same time. Moreover, the momentary pivot of the second tilting movement about the virtual axis ( 13 ) essentially lies at the same distance above the rear middle part of seat base ( 2 ).
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