Abstract: A chair with a swivel seat and backrest includes a base support having a central portion on which is vertically mounted a hydraulic cylinder, the hydraulic cylinder having an upwardly extending piston rod, a seat having a bottom provided with a base frame, a first gear disposed under the base frame, a backrest having a lower portion provided with a support member, the supporting member having a lower end provided with a second gear meshed with the first gear, a bracket including an upper mounting and a lower mounting, the upper mounting having a top provided with two vertical bolts, one of the vertical bolts extending upwardly through the first gear to engage with the base frame, another one of the vertical bolts extending upwardly through the second gear to engage with the supporting member, the lower mounting being fixedly connected with the upper mounting having a downwardly extending tubular portion receiving the piston rod, and two armrests fixedly mounted on two opposite sides of the backrest, whereby t

Abstract: A reclining chair with exercising function includes symmetrical front and rear chair frames, and an adjusting rod pivotally connected to said front and rear chair frames by connecting plates. The adjusting rod is connected by springs to the rear chair frame. Both sides of the front chair frame are respectively provided with connecting plates to pivotally connect to a securing rod and a front support rod. The rear chair frame is pivotally connected to a rear support rod at both sides thereof by connecting plates. When the adjusting rod is retained at a bottom rod, an ordinary reclining chair is accomplished. When the adjusting rod is pulled upwardly, the reclining chair will bent downwardly or upwardly for V-shaped or inverted V-shaped body exercises.

Abstract: A chair with a swivel seat and backrest includes a base support having an upright shaft, a seat having a bottom provided with a supporting board having to two opposite bolts, the two opposite bolts being fixedly installed on two opposite ends of an oscillating plate, the oscillating plate having a central portion pivotally connected with a tubular axle, the tubular axle being put on to the upright shaft of the base support, a backrest, a casing mounted on the upright shaft of the base support and located under the oscillating plate, the casing being provided with a vertical shaft having an upper portion fixedly engaged with the backrest and a lower end fixedly connected with a first gear, two linking rods each having an end pivotally connected a respective end of the oscillating plate, and means pivotally connected with the two linking rods and driven by the first gear.