Patent ID: 7634836

Claim:
An intake nozzle of a vacuum cleaner, comprising: a nozzle case having a main air passage that extends therethrough; a first air intake port provided at a bottom of the nozzle case, at an inlet end of the main air passage, wherein an air intake force generated by an air intake device draws particle laden air in through the first air intake port and into the main air passage; and an intake force adjusting device that varies an amount of intake force conveyed through the first intake port based on a contacting surface of a surface to be cleaned, wherein the intake force adjusting device comprises a separate chamber provided in the main air passage formed in the nozzle case; an auxiliary air passage formed in a first side wall of the chamber, wherein the auxiliary air passage guides external air into the chamber; a second air intake port formed in a second side wall of the chamber, wherein the second air intake port receives air from the first air intake port; and an opening/closing portion that selectively opens the auxiliary air passage based on a difference between a pressure within the chamber and an atmospheric pressure outside the nozzle case so as to prevent blockage in the chamber.