Dust suction head for electric vacuum cleaner

A dust suction head for use in an electric vacuum cleaner, comprising:

• a body having in the bottom thereof an air suction port;
• a brush chamber formed in said body;
• a freely rotatable rotational brush mounted on a shaft within said brush chamber and having a multiplicity of flexible blades helically mounted on said shaft along the length of said shaft;
• and
• an opening formed apart from said suction port, for taking in fresh air, said opening extending at an angle with said blades such that the fresh air is constantly provided obliquely to said blades regardless of the angular position of said rotational brush.

A dust suction head for use in an electric vacuum cleaner, comprising:

• a body having in the bottom thereof an air suction port;
• a brush chamber formed in said body;
• a freely rotatable rotational brush mounted on a shaft within said brush chamber and having a multiplicity of flexible blades mounted on said shaft along the length of said shaft;
• and
• an opening formed in said body for taking in fresh air and guiding the fresh air to said blades so as to assist rotation of said rotational brush,
• wherein said blades are formed such that said blades are bent away from a radial direction from said shaft so that said blades do not touch a floor to be cleaned when said rotational brush is not rotated, and said blades are extended by centrifugal force to touch the floor when said rotational brush is rotated.