US Patent 7383604 Mop wringer

A mop wringer includes a base and a plurality of sides which can define a channel having a uniform or substantially uniform cross-section along its longitudinal extent, and one or more openings in the base and/or sides by which fluid can drain from the wringer. One of the sides is a pivotable guide element which is pivotable relative to the other sides on axle elements which are spaced from and which are between in use uppermost and lowermost ends of the said pivotable guide element. The in use pivotable guide element provides a wider opening for insertion of a mophead into the channel, but does not pivot to squeeze the mophead.