Patent ID: 6951370

Claim:
A chair comprising: a seat frame; a seat mounted on said seat frame; two front legs fastened at one end to said seat frame; two rear legs fastened at one end to said seat frame; and two armrests mounted on said seat frame, wherein said seat frame has a reciprocating means for causing said seat to move up-and-down in a reciprocating manner, said reciprocating means comprising: a fastening member fastened to an underside of said seat frame; a drive motor mounted on said fastening member, said drive motor having an output shaft; and a transmission member fastened at a bottom end with said output shaft of said drive motor, said transmission member having a contact portion at top end thereof which comes in contact with an underside of said seat whereby said seat is pushed by said contact portion of said transmission member to engage in a series of repeated up-and-down motions at such time when said drive motor is in operation, said seat frame having a backrest pivoted therewith, said seat frame having a reclining means mounted in said underside thereof for adjustably reclining said backrest, said reclining means comprising; a cylinder; a control lever; a position control plate; an actuation pin, said cylinder being pivoted at a first end thereof with said backrest and having a pressure release knob at a second end thereof; and a U-shaped support pivoted with said seat frame and having two receiving holes receiving said actuation pin such that one end of said actuation pin is movably located in a triangular hole of said position control plate which is fastened with said control lever whereby said position control plate is actuated to turn by said control lever, thereby resulting in displacement of said actuation pin such that said pressure release knob of said cylinder is activated by said actuation pin so as to adjustably recline said backrest.