Patent ID: 6966077

Claim:
An apparatus for opening, and closing a drain valve in a washstand having a hole to which a drain-pipe is connected, the apparatus comprising: the drain valve having a cap for preventing liquid flow through the hole into the drainpipe and an elongated rod having a first end connected to the cap and a second end disposed inside the drainpipe, a motor having a motor shaft formed outside the drainpipe; a circular cam contacting the second end of the elongated rod of the drain valve inside the drain pipe and being connected to the motor shaft through the drainpipe, wherein the cam is mounted inside the drainpipe to come in contact with the liquid flowing through the drainpipe, and wherein the cam is driven by the motor to rotate to exert axial force on the second end of the elongated rod by which the elongated rod is actuated opposite the bias force to move the cap to a plurality of predetermined positions with respect to the hole of the washstand a switch for initiating the movement of the cap to a plurality of predetermined positions with respect to the hole of the washstand; a spring for providing a bias force on the elongated rod so that the cap is actuated to fit into the hole to close the drain valve when the switch is in the off state; a upper spring housing; and a lower spring housing, wherein the upper spring housing and the lower spring housing are fitted together to form an inner cylindrical opening and an outer cylindrical opening, wherein the fitted inner and lower spring housing are mounted inside the drainpipe such that the outer cylindrical opening allows liquid flow therethrough, wherein the inner cylindrical opening receives a portion of the elongated rod and the spring wrapping around the portion of the elongated rod inside the inner cylindrical opening, and wherein the spring is housed inside the inner cylindrical opening to exert force on the elongated rod by which the cap of the drain valve is closed during the off state.