Patent ID: 8205945

Claim:
A rotary mechanism for a seat, comprising: an upper seat pan; a lower seat pan connected relatively rotatably to the upper seat pan proximate the respective sides of the upper and lower seat pans; and an arc slideway mechanism located between and connected to the upper seat pan and the lower seat pan for guiding the relative rotation of the upper seat pan and the lower seat pan the arc slideway mechanism comprising an upper outer slide rail, an upper supporting plate, a middle inner slide rail, a lower supporting plate, a lower outer slide rail and at least one fixed part, the middle inner slide rail including a long through-hole in a center portion, the upper supporting plate and the lower supporting plate each having a long aperture in a respective center portion, the middle inner slide rail being positioned between the upper supporting plate and the lower supporting plate, the upper outer slide rail being on the upper supporting plate, the lower outer slide rail being under the lower supporting plate, the at least one fixed part running through the long through-hole and the long apertures to fix the upper outer slide rail and the lower outer slide rail, the upper outer slide rail being fixed to one of the upper seat pan or the lower seat pan, and the middle inner slide rail being fixed to an other of the lower seat pan or the upper seat pan.