Abstract: A floor cleaning device includes a floor covering compartment having a cleaning opening, a vacuum generating device, a suction pipe that connects the floor covering compartment to the vacuum generating device so that suction force is applied on the surface covered by the cleaning opening, a cleaning head body that holds the floor covering compartment, and a vibrating device that causes vibration of the floor covering compartment relative to the cleaning head body. The periphery of the cleaning opening is adapted to contact a surface to be cleaned so that a sealed cleaning space is formed inside the floor covering compartment and over the portion of the surface covered by the cleaning opening. Strong negative pressure is built up in the sealed cleaning space to enhance suction efficiency. Vibration temporarily breaks the sealed state to facilitate moving of the floor covering compartment.

Abstract: A toothbrush comprises a plurality of bristles, each of which comprises an upper part and a lower part, wherein toughness of the lower part is smaller than the toughness of the upper part, an enrooting member into which the bristles are enrooted, wherein the enrooting member comprises a plurality of enrooting holes that receive the plurality of bristles, wherein each of enrooting hole comprises an enrooting recess that receives the lower part of the bristle. A method of manufacturing a toothbrush comprises steps of cutting a predetermined length from a plastic wire; processing the cut wire into a bristle having an upper part and a lower part, wherein toughness of the lower part is smaller than the toughness of the upper part; and enrooting the bristles into a plurality of enrooting holes of the enrooting member.

Abstract: A floor cleaning device includes a floor covering compartment having a cleaning opening, a vacuum generating device, a suction pipe that connects the floor covering compartment to the vacuum generating device so that suction force is applied on the surface covered by the cleaning opening, a cleaning head body that holds the floor covering compartment, and a vibrating device that causes vibration of the floor covering compartment relative to the cleaning head body. The periphery of the cleaning opening is adapted to contact a surface to be cleaned so that a sealed cleaning space is formed inside the floor covering compartment and over the portion of the surface covered by the cleaning opening. Strong negative pressure is built up in the sealed cleaning space to enhance suction efficiency. Vibration temporarily breaks the sealed state to facilitate moving of the floor covering compartment.