Abstract: A drain structure used for mounting in a pipe includes a ring wall, a bottom plate and a chamber, wherein at least one overflow hole mounted on the ring wall communicates with an inner ring wall and an outer ring wall. The overflow hole comprises a first opening and a second opening, wherein the first opening comprises a top edge, and the second opening comprises a bottom edge. A first horizontal surface passes through the top edge of the first opening, and a second horizontal surface passes through the bottom edge of the second opening, wherein the first horizontal surface is not higher than the second horizontal surface to form a first water tank between the second horizontal surface and the bottom plate. Liquid accumulated in the first water tank is able to prevent insects and gases in outdoors from entering indoors via the pipe.

Abstract: A power generating apparatus enables a power generating module to generate electric power via reciprocal movement of a transmission module. The transmission module at least includes a transmission rod and a counterweight block. The power generating module includes a supporting rack, a rotation shaft, a one-way rotating gear, a first gear, a second gear and a generator. The rotation shaft is pivotally disposed at the supporting rack, the one-way rotating gear and the first gear are coupled to the rotation shaft, the one-way rotating gear is engaged with the transmission rod, the second gear is coupled to the generator, and the second gear is engaged with the first gear. An elastic member can push forward the transmission module, and the transmission module is reciprocally movable by gravity and reacting force of the elastic member.

Abstract: A power generating apparatus enables a power generating module to generate electric power via reciprocal movement of a transmission module. The transmission module at least includes a transmission rod and a counterweight block. The power generating module includes a supporting rack, a rotation shaft, a one-way rotating gear, a first gear, a second gear and a generator. The rotation shaft is pivotally disposed at the supporting rack, the one-way rotating gear and the first gear are coupled to the rotation shaft, the one-way rotating gear is engaged with the transmission rod, the second gear is coupled to the generator, and the second gear is engaged with the first gear. An elastic member can push forward the transmission module, and the transmission module is reciprocally movable by gravity and reacting force of the elastic member.