Patent ID: 8550558

Claim:
A chair comprising: a seat, a backrest and a chair base; a first connector, which connects the backrest and the chair base together, the first connector comprises: a base holder rigidly connected to the chair base, a back holder secured to the backrest, a rotation holder, a first linkage bar, a second linkage bar and a third linkage bar; the rotation holder is pivotally connected to the base holder, the back holder is connected to the rotation holder through a linear sliding connection; one end of the first linkage bar is pivotally connected to the back holder, a second end of the first linkage bar is pivotally connected to one end of the third linkage bar, one end of the second linkage bar is pivotally connected to the rotation holder, a second end of the second linkage bar is pivotally connected to a middle point of the third linkage bar, a second end of the third linkage bar is pivotally connected to the base holder; a reposition mechanism installed on the chair base for moving the backrest forward to return to its original position during backward inclination of the backrest; and a position mechanism installed on the chair base for positioning the backrest at a tilt angle.