Patent ID: 6241316
Filing Date: 2001-06-05
Classification: A47C,Y10S

Abstract:
An apparatus for adjusting the height of a swivel chair, said apparatus comprising:an outer tube rotatably fitted in a seat of the swivel chair;a spindle slidably inserted in the outer tube, the spindle containing a cylinder fixed in the spindle by means of a cylinder holder disposed at a lower position of the spindle;a piston rod fixedly contained in the outer tube and slidably inserted in the spindle through a bottom of the spindle;an actuating pin socket fixed at a top of the cylinder, the actuating pin socket having a socket body and a socket coating coated on the socket body, the socket body having an actuating pin hole and an orifice formed in the socket body, and an annular reinforcement protruding outward from a middle portion of the socket body, the actuating pin socket being manufactured by an integral single forming, the orifice being formed through the annular reinforcement;an actuating pin slidably fitted in the actuating pin hole; and,a piston fixed at an upper portion of the piston rod and slidably fitted in the cylinder, the actuating pin socket and the piston defining a first chamber above the piston in the cylinder, the spindle and the cylinder defining a second chamber between the spindle and the cylinder, the piston and the cylinder defining a third chamber under the piston in the cylinder, the orifice of the socket body being connected to the second chamber, the second chamber and the third chamber communicating through a gas-passing hole formed through an outer portion of the cylinder holder, the first, the second, and the third chambers containing working fluid,wherein, the actuating pin opens the orifice to communicate the first chamber with the second chamber so that working fluid can flow from the first chamber through the second chamber into the third chamber when the actuating pin is pressed down, while the actuating pin blocks up the orifice when the actuating pin is not pressed down.