Patent ID: 8112840

Claim:
A disc rotating and positioning structure of a mop, comprising: a) a mop head, including a disc, a plurality of cotton strips disposed at a bottom periphery of the disc, and a circular hole disposed at the center of the disc; b) a mop rod, having a bottom provided for connecting the mop head; c) a pivotal base, having an upper section which is a bushing with an opening facing upward, and provided for placing and fixing the bottom of the mop rod, and a lower section which is an n-shaped member having different sized first and second lugs disposed on both sides of the n-shaped member and corresponding to the first and second axial holes respectively; d) a positioning device, disposed at the top of the circular hole of the disc, and having a first positioning surface greater than the circular hole at the center of the disc, a long slot disposed at the center of the first positioning surface and opposite to the circular hole, a third lug disposed on a side of the long slot and on a surface on the first positioning surface, and a third axial hole disposed thereon and corresponding to first and second axial holes; e) a locking device, disposed at the bottom of the circular hole of the disc, and having a second positioning surface, a circular hole disposed on a surface on the second positioning surface and provided for passing the disc, and a fourth lug disposed at the long slot of the positioning device and having a fourth axial hole corresponding to the third axial hole; and f) a bolt, including a semicircular cam disposed on a portion of a bolt pillar, and axially passed through the first, second, third and fourth axial holes of the first, second, third and fourth lugs, such that the third and fourth lugs are pivotally coupled between the first and second lugs to situate the semicircular cam into the fourth lug, and an external side of the bolt is secured to the n-shaped member by a screw, and the bolt is rotated together with the first and second lugs, so as to drive the semicircular cam to push the fourth axial hole of the lug, whereby, when the mop is dewatered, the mop rod is in an erect position, such that the semicircular cam of the bolt faces upward to drive the locking device to press the disc upward and into a locked and linking status, and when the mop is used for mopping, the mop rod is in an inclined position to drive the semicircular cam of the bolt to shift to a side, such that the locking device is in a non-pressing status with respect to the disc, and a force is applied to rotate the mop head when the mop is used for mopping a floor.