Abstract: A mop bucket has a sliding base to engage with for moving around freely. The sliding base has an L-shaped frame to engage and support the body from a bottom thereof, and plural castors for the mop bucket to be moved in every direction; also, the mop bucket is detachable from the sliding base for water filling and emptying.

Abstract: An electronic device includes a main body, a slot formed on a side of the main body, and a tray unit received in the slot. The tray unit includes a cover, a supporting base, a shaft, and a waterproof member. The supporting base is configured to receive an external card. The shaft pivotally connects the cover with the supporting base, and the supporting base is rotatable with respect to the cover along the shaft. The waterproof member is disposed on the cover. When the tray unit is received in the slot, the waterproof member abuts the main body of the electronic device.

Abstract: An electronic device includes a main body, a slot formed on a side of the main body, and a tray unit received in the slot. The tray unit includes a cover, a supporting base, a shaft, and a waterproof member. The supporting base is configured to receive an external card. The shaft pivotally connects the cover with the supporting base, and the supporting base is rotatable with respect to the cover along the shaft. The waterproof member is disposed on the cover. When the tray unit is received in the slot, the waterproof member abuts the main body of the electronic device.

Abstract: A confining structure of a rotating mop has a one-piece loop on a disc thereof, at least two stopping blocks arranged on the loop, and an n-typed body of a linking element being arranged correspondingly to the surface of the loop and the bottom of each stand thereof having an engaging block corresponding to the position of the stopping blocks. When the rotating rod is perpendicular to the disc, the linking element is closely joined but movable with the engaging blocks. When the bottom of the engaging blocks cannot abut on the loop and slips, the stopping blocks fix the position by abutting on the engaging blocks for the rotating rod to rotate for dewatering by centrifugal force. When the rotating rod is leaning, the linking element is not closely joined with the engaging blocks.

Abstract: Disclosed is an ink-jet device applicable to various ink-jet equipments. The device includes an ink reservoir, an ink chamber, pressure generating units and an ink-jet head. The ink-jet head has dielectric layers coated on an inner surface and an outer surface thereof. By applying a voltage to the dielectric layers, the dielectric layers are changed to be hydrophobic or hydrophilic, so as to reduce residual ink accumulated in the ink-jet head during the ink-jetting process, hence improving ink-jetting accuracy.

Abstract: A cholesteric liquid crystal display device is disclosed. The cholesteric liquid crystal display device includes a substrate, a light absorbing layer, and a cholesteric liquid crystal layer. The cholesteric liquid crystal layer includes plural rows of left-handed cholesteric liquid crystals and plural rows of right-handed cholesteric liquid crystals which are arranged alternately. The left-handed cholesteric liquid crystals and the right-handed cholesteric liquid crystals respectively reflect left-handed light and right-handed light in the cholesteric liquid crystal display device of the present invention, whereby both eyes of an observer can see different images and thus a 3D effect is formed.