Chair with swivel seat and backrest

A chair with a swivel seat and backrest comprising:

• a base support having a central portion on which is vertically mounted a hydraulic cylinder, said hydraulic cylinder having an upwardly extending piston rod;
• a seat having a bottom provided with a base frame;
• a first gear disposed under said base frame;
• a backrest having a lower portion provided with a supporting member, said supporting member having a lower end provided with a second gear meshed with said first gear;
• a bracket including an upper mounting and a lower mounting, said upper mounting having a top provided with two vertical bolts, one of said vertical bolts extending upwardly through said first gear to engage with said base frame, another one of said vertical bolts extending upwardly through said second gear to engage with said supporting member, said lower mounting being fixedly connected with said upper mounting having a downwardly extending tubular portion receiving said piston rod;
• and
• two armrests fixedly mounted on two opposite sides of said backrest;
• whereby when a user sitting on said seat turns said armrests, said backrest will be rotated thereby rotating said second gear which rotates said first gear in an opposite direction and therefore turning said seat in an opposite direction to said backrest.