Patent ID: 6644743
Filing Date: 2003-11-11
Classification: A47C

Abstract:
A chair comprising:a chair base (1); a seat (2) mounted on top of the chair base (1); a backrest (3) pivotally attached to a rear of the seat (2), the backrest (3) including a support rod (32) mounted thereon; and a chassis (4) mounted below the seat (2), the chassis (4) including a base (41), a positioning mechanism (42), a movable member (44), and a support frame (46); the base (41) including a rear end fixedly connected to the support frame (46), the base (41) including an intermediate portion for connection with the positioning mechanism (42), the base (41) further including a front end on which two guide plates (414) are mounted for connecting with a front end of the movable member (44), each guide plate (414) having a guide slot (4141); the positioning mechanism (42) including at least one positioning plate (421) and a control rod (422), said at least one positioning plate (421) being mounted to the base (41) and including an end connected to a rear end of the movable member (44), a top having a hole (4211) defined therein, and an intermediate portion having a slot (4212) defined therein, the control rod (422) controlling said at least one positioning plate (421) to move between a loosened position and a tightening position for retaining the backrest in a desired inclination angle; the movable member (44) including an upper end fixed to the seat (2), a front axle rod (444) being mounted to a front end of the movable member (44) and extending through the guide slots (4141) of the guide plates (414) of the base (41), a rear axle rod (445) being mounted to a rear end of the movable member (44) and extending through the hole (4211) of said at least one positioning plate (421); the support frame (46) including a bottom fixed to a rear end of the base (41) and a top pivotally connected to the support rod (32) of the backrest (3); wherein when the backrest (3) is tilted rearward, the seat (2) moves forward and urges the movable member (44) to shift, with the front axle rod (444) sliding along the guide slots (4141) of the guide plates (414), and with said at least one positioning plate (421) moving together with the rear axle rod (445).