Abstract: A toilet-seat flush-valve operating mechanism comprises two systems, a toilet-seat lifting system and a flush-valve opening system, both employing the fluid pressure as a source of power. A hydraulic cylinder having on the bottom a water inlet is mounted inside a toilet cistern. When a piston-cum-static weight located inside the cylinder moves under water pressure and reaches a position at the upper end of the cylinder, the toilet seat descends and covers the toilet bowl. This piston-cum-static weight, that is, the weight of the static weight, falls down under its own weight to the position at the lower end of the cylinder and, by means of a connecting unit, lifts up the toilet seat. Due to the piston-cum-static weight, which is in balance with and slightly heavier than the toilet seat, relatively low water pressure is sufficient to push the piston-cum-static weight to move upwardly, thus permitting the toilet seat to descend under its own weight.

Abstract: A double-barrel type sanitary trash bin having the two symmetrically arranged barrels disposed immediately on each side of a main container and a cross arm supported at the center on the apex of a piston rod and having the two ends attached at the lower sides to the upper sides of two barrel lids by suspension bars. A lid-operating mechanism comprises an air cylinder, a piston rod having at the lower end thereof a piston, an operating lever and a connecting rod and serves for the opening and closing of the lids. A further embodiment having no cylinder and piston is also disclosed.