Sink stopper

A sink stopper for a sink body having a base formed with a drain hole that is confined by a tubular hole-confining wall, said sink stopper comprising:

• a strainer adapted to be mounted on the base and having a perforated strainer wall to be disposed in the drain hole;
• an operating device including
• a stationary member extending along an axis and formed with a first mounting end that is mounted on said perforated strainer wall of said strainer,
• a movable member coupled movably to said stationary member and formed with a second mounting end, said movable member being movable along said axis relative to said stationary member to move said second mounting end toward and away from said first mounting end, and
• a switching unit provided on said stationary and movable members and operable to retain releasably said movable member at a selected one of first and second positions relative to said stationary member, wherein said second mounting end forms a first distance with said first mounting end when said movable member is at the first position, and wherein said second mounting end forms a second distance with said first mounting end, said second distance being shorter than said first distance, when said movable member is at the second position;
• and
• a closure member mounted on said second mounting end of said movable member, said closure member being configured to form a clearance with the base to permit draining of water in the sink body through the drain hole when said movable member is at the first position, and being adapted to abut sealingly against the base to seal the drain hole when said movable member is at the second position;
• wherein said stationary member includes a tubular sleeve, and said movable member extends slidably into said stationary member, wherein said switching unit includes looped guide groove formed in said movable member, spring-loaded tumbler mounted on said stationary member and engaging said guide groove, said guide groove having first and second control points spaced apart from each other along said axis, said tumbler engaging said guide groove at one of said first and second control points to retain releasably said movable member at a corresponding one of the first second positions, wherein said switching unit further includes a biasing member for biasing said movable member along said axis extend outwardly of said stationary member, wherein said stationary member further has a tumbler mounting flange extends inwardly from one end of said stationary member opposite to said first mounting end, said tumbler mounting flange being formed with a tumbler hole that extends transverse to said axis and that has an inner hole end adjacent to said movable member, and an outer hole end opposite to said inner hole end, said tumbler being mounted in said tumbler hole and projecting through said inner hole end, said stationary member further having a tumbler cap for closing said outer hole end of said tumbler hole.