Foldable agitator

A foldable agitator comprising:

• a coupling body;
• a plurality of impeller arms rotatably coupled to a perimeter of the coupling body;
• and
• a piston inserted in the coupling body such as to be movable vertically, the piston configured to unfold or fold the plurality of impeller arms simultaneously by a movement process,
• wherein the coupling body comprises a body coupler part and a piston insertion part, the body coupler part having the impeller arm coupled thereto, the piston insertion part having the piston movably inserted therein,
• an insertion slot is formed between a pair of adjacent body coupler parts,
• the piston comprises a pressing protrusion positioned to be movable within the insertion slot, and
• the impeller arms are rotated by a vertical movement of the pressing protrusion.