Patent ID: 7111337
Filing Date: 2006-09-26
Classification: E03C

Abstract:
1. A height-adjustable washstand comprising a hydraulic height adjuster, the hydraulic height adjuster comprising: a cylinder vertically provided at the bottom of a washstand or on the floor to allow the washstand to go up and down; a control valve fixed to one side of the washstand to control the operation of the cylinder; a supply pipe for connecting a tap pipe and control valve; a discharge pipe for connecting the control valve and a drain pipe; and a first operational pipe, for connecting the portion above an inner piston of the cylinder and the control value; and a second operational pipe for connecting the portion below an inner piston of the cylinder and the control valve; wherein water is supplied to one of the portion above the inner piston and the portion below the inner piston through the supply pipe and the control valve while water is discharged from the other portion among the portion above the inner piston and the portion below the inner piston through the discharge pipe and the control valve, thereby the washstand is allowed to go up and down only by hydraulic pressure difference, wherein the control valve comprises: a body in which a plurality of connection holes are formed at one side thereof; a control plate inserted into the body, a control hole arranged at the same positions as the connection holes being formed in the control plate; a valve spool in which a plurality of control grooves are formed at one surface closely attached to the control plate and a plurality of locking grooves are formed at the edges of the other surface; a control member provided at one side with locking bosses inserted into the locking grooves, and provided at the other side with a lever; a seat in which a locking jaw provided between the body and the control plate is formed to prevent rotation of the control plate; an upper cover coupled to the body, a penetration hole for penetrating the lever being formed in the upper cover; and a valve handle coupled to the lever to rotate the control member.