| 摘要 |
A servo mechanism for a seat part arranged on a support frame for travel in a longitudinal direction in synchronism with an adjustment of a back rest part from a normal position to several predetermined reclined positions, includes a scissor-type articulated lever assembly which is connected to the seat part and the support frame. The articulated lever assembly includes several articulated lever elements. A spring assembly progressively applies a spring force upon the scissor-type articulated lever assembly such that a relative change in angular disposition between the lever elements applies a substantially constant force upon the seat part in every position of the seat part, whereby a relatively great longitudinal travel distance of the seat part is accompanied by a short spring travel during the spring force application.
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