Upright type vacuum cleaner having a cyclone type dust collector

An upright type vacuum cleaner comprising:

• a body having a dust chamber and a motor driving chamber;
• a suction brush connected to the body;
• cyclone type dust collecting means removably disposed in the dust chamber, for separating and collecting contaminants from air that is drawn in through the suction brush, the cyclone type dust collecting means comprising:
• a cover having a first air inlet connected to a suction hose, the suction hose being connected to the suction brush and the dust chamber, the cover also having an air outlet connected to an exhaust hose, the exhaust hose being connected to the dust chamber and the motor driving chamber;
• a first cyclone receptacle connected to the cover, the first cyclone receptacle inducing the air into a vortex to separate by centrifugal force and collect larger particle contaminants from the air;
• a second cyclone receptacle disposed in the first cyclone receptacle, the second cyclone receptacle being connected to the cover and having a grill, the grill having a plurality of fine holes through which air from a bottom of the first cyclone receptacle flows, the second cyclone receptacle further including a second air inlet for guiding the air from the fine holes of the grill into a vortex;
• a lower door removably mounted on an open lower end of the first cyclone receptacle, the lower door permitting disposal of contaminants from the first and second cyclone receptacles;
• and
• reverse flow preventing means for preventing a reverse flow of contaminants from the lower door.