Mop assembly

1. A mop assembly comprising:

a rotary rod structure including

a rotary rod defining an elongated axial space therein, and

a driving unit fixed securely within said axial space of said rotary rod and formed with a central spiral hole;

a handgrip structure disposed above said rotary structure and including

a handgrip rod connected telescopically to said rotary rod from above,

a spiral spindle disposed within said handgrip rod, having an upper portion fixed to said handgrip rod so as to move together therewith and a lower portion engaging rotatably to said spiral hole within said driving unit and extending into said rotary rod, and

a cleaning mop connected pivotally to a bottom end of said rotary rod; and

a spinning structure including

a water bucket,

a draining bucket disposed within said water bucket for receiving said cleaning mop therein, and

a support post installed vertically in said water bucket below said draining bucket in such a manner that said support post has an upper end supporting said draining bucket thereabove;

wherein, once said cleaning mop is placed within said draining bucket, axially downward movement of said handgrip structure relative to said rotary rod structure results in axial rotation of said spiral spindle within said spiral hole in said driving unit into a predetermined direction, thereby driving said draining bucket to rotate in said predetermined direction and hence draining out water from said cleaning mop by virtue of centrifugal force and wherein axially upward movement of said handgrip structure relative to said rotary rod structure results in continuously driving and rotating said draining bucket in said predetermined direction.

2. The mop assembly according to claim 1 , wherein said driving unit further includes

a unidirectional rotation unit in the form of a hollow tube having an outer wall fixed to an inner surface of said rotary rod, and

a direction guider disposed within and rotatable relative to an inner wall of said unidirectional rotation unit in a single direction and defining said spiral hole;

wherein, axially downward movement of said handgrip structure relative to said rotary rod structure results in said axial rotation of said spiral spindle within said spiral hole, thereby driving said direction guider to rotate in said predetermined direction and hence rotating said unidirectional rotation unit and said rotary rod in said predetermined direction.

3. The mop assembly according to claim 2 , wherein said unidirectional rotation unit is a unidirectional bearing unit rotatable in said single direction.

4. The mop assembly according to claim 1 , wherein said driving unit further includes:

a limiting unit fixed to an inner surface of said rotary rod and defining a limiting chamber formed a lower friction face;

a direction guider disposed within said limiting chamber, defining said spiral hole and having an upper friction face; and

a friction-producing element disposed within said limiting chamber between said direction guider and said lower friction face of said limiting unit, said friction-producing element having

a top friction face disposed adjacent to said upper friction face of said direction guider,

a bottom friction face disposed adjacent to said lower friction face of said limiting unit;

wherein, said spiral spindle extends through said limiting unit, said direction guider and said friction-producing element in such a manner that axially downward movement of said handgrip structure relative to said rotary rod structure results in said axial rotation of said spiral spindle within said spiral hole, thereby rotating said direction guider in said predetermined direction and simultaneously and axially moving said direction guider downward so as to abut said top and bottom friction faces of said friction-producing element respectively against said upper and lower friction faces of said limiting unit and said direction guider, hence generating friction force to rotate said limiting unit in said predetermined direction and that axially upward movement of said handgrip structure relative to said rotary rod structure results in axial rotation of said spiral spindle within said spiral hole, thereby rotating said direction guider in said predetermined direction and simultaneously and axially moving said direction guider upward away from said friction-producing element.

5. The mop assembly according to claim 4 , wherein said friction-producing element has a truncated cone-shaped structure.

6. The mop assembly according to claim 1 , wherein said cleaning mop includes:

a circular fixing member;

a pivot element for connecting pivotally said bottom end of said rotary rod to an upper part of said fixing member;

a circular holding plate connected detachably to a lower part of said fixing member; and

plurality pieces of wiping cloth attached respectively to said holding plate at several positions thereof.

7. The mop assembly according to claim 1 , further comprising a fastening mechanism for fastening said handgrip structure and said rotary rod structure in order to prevent axial movement and axial rotation relative to each other.

8. The mop assembly according to claim 1 , wherein said water bucket includes:

a bucket body formed with a cleaning access for access to said water compartment and a circular spinning access for access to said draining bucket; and

a spill-protection plate disposed between said cleaning and spinning accesses proximate to said draining bucket for preventing water spilling from said water bucket to an exterior of said water bucket via said spinning access during spinning of said draining bucket in said predetermined direction.