Patent ID: 8528128

Claim:
A closure device for a drain pipeline comprising: an outer sleeve including upper and lower ends spaced in a vertical direction, with the upper end of the outer sleeve having an upper coupling opening for connecting with a drain of a sink or washbasin, with the lower end of the outer sleeve having a lower coupling opening for connecting with a drainpipe; an inner sleeve installed within the outer sleeve and including upper and lower sections spaced in the vertical direction, with the upper section of the inner sleeve having an inner flange formed on an inner periphery of the upper section of the inner sleeve, with the inner flange defining a flow port, with the inner sleeve provided with a spring seat, a guide, and a spring, with the spring seat mounted in the lower section of the inner sleeve, with the guide extending from the spring seat toward the upper section of the inner sleeve in the vertical direction, with the spring mounted around the guide and including top and lower ends spaced in the vertical direction, with the lower end of the spring abutting against the spring seat; and a closure member received in the inner sleeve and including a closure portion and a tube portion extending upwards from the closure portion in the vertical direction, with the closure portion located between the spring seat and the inner flange of the inner sleeve, with the closure portion abutting against the upper end of the spring, with the tube portion mounted around an upper end of the guide, with the closure member being moveable between a first position and a second position in the vertical direction, with the closure portion biased by the spring to close the flow port when the closure member is in the first position, and with the closure portion spaced from the inner flange to open the flow port when the closure member is in the second position.