By crushing larger pieces of ice into smaller chips, a larger contact surface is created with the liquid. The cooling process in the drink therefore becomes more efficient.
When the handle is manually rotated, a plate pushes the inserted ice cubes against a rotating grater, which crushes the ice into smaller pieces. When the plate has reached the grater, it returns to its starting position.
The funnel at the other side of the grater makes sure that the crushed ice is directed into the glass positioned at the base of the ice crusher.