Damper hinge and western-style toilet using the same

A damper hinge using a fluid damper mechanism and a torsion damper mechanism for openably and closably attaching an opening and closing body to an opened and closed body, said fluid damper mechanism comprising a cylinder case open at one end to be attached to the opened and closed body, a fluid housing chamber and a torsion housing chamber being provided across a partition wall;

• a plurality of locking ridges provided in an axial direction on an inner circumferential wall of said fluid housing chamber provided on the cylinder case;
• a valve piece engaged with each engaging ridge and having a U-shaped cross section;
• a cap attached to an open end side of the cylinder case;
• and a rotation shaft attached to said opening and closing body, said rotation shaft passing through said cap in a water-tight state and a plurality of blade portions being provided to protrude on one end portion side thereof, said fluid damper mechanism being structured, thereby fluid passages being formed between each valve piece and said locking ridge, between said arc-shaped groove provided on said inner circumferential wall of said cylinder case and said blade portions and between said medium diameter shaft portion with said blade portion protruding therein and said locking ridge, during a rotation of said rotation shaft, and said torsion damper mechanism comprising a link shaft rotatably provided in the torsion housing chamber, passing through said partition wall and engaging with said rotation shaft in an axial direction in said fluid housing chamber, a cap attached to said opening end of said damper housing chamber to pivotally supporting one end portion of the link shaft;
• and a torsion spring wound around said link shaft between said link shaft and said cylinder case.

A damper hinge comprising a cylinder case having a cylindrical shape, a partition wall being provided therein;

• a valve member provided in contact with one side of said partition wall in a fluid housing chamber provided across said partition wall in said cylinder case with a rotation being regulated, and having a pair of valve piece portions provided at a predetermined interval on an outer circumference thereof;
• a rotation shaft rotatably provided in contact with said valve member in water-tight state, with a movement being regulated in an axial direction in a rotatable manner, said rotation shaft comprising at least a flange portion and a pair of blade portions provided next to said flange portion;
• a link shaft provided in a torsion housing chamber provided on the other side across the partition wall in said cylinder case, with a movement being regulated in an axial direction as well, and coaxially coupled to said rotation shaft in a water-tight state via said partition wall;
• a fluid damper mechanism provided on said rotation shaft;
• and
• a torsion damper mechanism provided on said link shaft;
• said fluid damper mechanism being situated between said pair of valve piece portions, said fluid damper mechanism comprising said pair of blade portions provided in contact with said valve member from said flange portion, a first fluid chamber and a second fluid chamber provided between said pair of valve piece portions, respectively housing said pair of blade portions and filled with fluid, a pair of first fluid passages respectively provided in said first fluid chamber and said second fluid chamber and driving in a predetermined rotation angle range of said rotation shaft via said blade portions, and a pair of second fluid passages provided on said valve piece portions and also driving in a predetermined rotation angle range of the rotation shaft via said blade portions.