Rotatable chair

Abstract

A rotatable chair comprising a backrest unit, a seat plate unit, a supporting unit and a rotating unit; the rotating unit comprises an upper plate, a lower plate, a rotating disc, a connecting shaft, a first elastic ball and a handle; the backrest unit and the seat plate unit are fixed to the upper plate; the upper plate is provided with an upper locating hole; the supporting unit is fixed to the lower plate; the lower plate is provided with a plurality of lower locating holes; the rotating disc is disposed between the upper plate and the lower plate; the connecting shaft penetrates through the central position of the upper plate, the rotating disc and the lower plate at the same time; the first elastic ball comprises an elastic piece and a locating ball.

1 . A rotatable chair, comprising:
 a backrest unit,   a seat plate unit,   a supporting unit, and   a rotating unit, wherein the rotating unit comprises an upper plate, a lower plate, a rotating disc, a connecting shaft, a first elastic ball and a handle, wherein the backrest unit and the seat plate unit are disposed above the upper plate, and are fixed to the upper plate, wherein the upper plate is provided with an upper locating hole, wherein the supporting unit is disposed underneath the lower plate, and is fixed to the lower plate, wherein the lower plate is provided with a plurality of lower locating holes, wherein the plurality of lower locating holes is distributed in the front, rear, left and right directions of the lower plate, wherein the rotating disc is disposed between the upper plate and the lower plate, wherein a plurality of rolling balls is uniformly distributed on the rotating disc, wherein the rolling balls simultaneously protrude from the upper surface and the lower surface of the rotating disc, wherein the connecting shaft penetrates through the central position of the upper plate, the rotating disc and the lower plate at the same time, thereby positioning the upper plate, the rotating disc and the lower plate in a radial direction, wherein the first elastic ball comprises an elastic piece and a locating ball, wherein the elastic piece is disposed on the upper plate, wherein the locating ball, which is molded with the elastic piece and is located in the upper locating hole, possesses a potential energy of moving towards the lower plate, wherein when the lower locating hole and the upper locating hole are butted, the locating ball enters into the lower locating hole, wherein one end of the handle is connected to the first elastic ball, and the other end of the handle is disposed on the outer side of the upper plate, wherein the handle can be pressed to lever the locating ball to escape the lower locating hole.   
     
     
         2 . The rotatable chair of  claim 1 , wherein the rotating unit comprises an upper disc and a lower disc, wherein the upper disc is disposed between the upper plate and the rotating disc, and the lower disc is disposed between the lower plate and the rotating disc. 
     
     
         3 . The rotatable chair of  claim 2 , wherein the rotating unit comprises a locating square tube, wherein the locating tube is threaded with the upper surface of the upper plate, and the first elastic ball is disposed in the locating square tube. 
     
     
         4 . The rotatable chair of  claim 1 , wherein the supporting unit comprises a first supporting leg and a second supporting leg that are arranged in a crossed manner, wherein the first supporting leg and the second supporting leg respectively comprise a chair-leg bending tube and a telescopic leg that is connected to the chair-leg bending tube, wherein the chair-leg bending tube is connected to the lower plate. 
     
     
         5 . The rotatable chair of  claim 4 , wherein the telescopic leg comprises an inner tube and an outer tube, wherein the inner tube is provided with a plurality of first holes, wherein the outer tube is provided with a plurality of second holes that are arranged along the outer tube in an axial direction, wherein a plurality of second elastic balls are disposed in the inner tube, wherein the second elastic balls penetrate through the first hole and the second hole that are butted at the same time. 
     
     
         6 . The rotatable chair of  claim 5 , wherein a leg sleeve is mounted at the lower end of the outer tube. 
     
     
         7 . The rotatable chair of  claim 1 , wherein the backrest unit comprises a backrest bending tube, backrest sleeves and a backrest plate, wherein the backrest sleeves are mounted on the upper plate, wherein the backrest bending tube is connected to the backrest sleeves, and the backrest plate is mounted on the backrest bending tube. 
     
     
         8 . The rotatable chair of  claim 7 , wherein the seat plate unit comprises a chair plate, armrest bending tubes and armrest sleeves, wherein the armrest sleeves are mounted on the backrest sleeves, wherein the armrest bending tubes are connected to the end portion of the armrest sleeves, and the chair plate is mounted on the armrest sleeves.