A mop is comprised of a mop head pivoted to the lower end of a stem. The mop head is comprised of a hollow housing, and a bottom plate with one end hinged to the housing, and another end secured to the housing with a latch. A mop pad is comprised of a flattened tubular sleeve for sliding around the bottom...http://www.google.es/patents/US20030221274?utm_source=gb-gplus-sharePatente US20030221274 - Mop and mop pad
