Liquid circulator

A liquid circulator, comprising:

• an oscillation shaft that is rotatable in clockwise and counterclockwise directions;
• a circulation assembly mounted to the oscillation shaft at a lower end thereof, the circulation assembly including a rotatable propeller that circulates a liquid, and a drive motor connected to the rotatable propeller to rotate the rotatable propeller;
• a head unit located above the circulation assembly, the head unit including a motor with a rotary output shaft;
• the oscillation shaft extending into and through the head unit whereby an upper end of the oscillation shaft is disposed above the head unit;
• and
• a drive mechanism associated with the head unit between the rotary output shaft and the oscillation shaft that is configured to convert rotation of the rotary output shaft into clockwise and counterclockwise oscillation of the oscillation shaft, wherein the drive mechanism is indirectly connected to the oscillation shaft whereby the oscillation shaft is indirectly driven by the drive mechanism and the oscillation shaft is configured to be raised and lowered relative to the head unit and the motor of the head unit.