Abstract: A laser leveler includes an ultrasonic transmitter, an ultrasonic receiver and a computer for computing distances traveled by an ultrasonic signal emitted from the ultrasonic transmitter and reflected back to the ultrasonic receiver.

Abstract: A laser leveler comprises a multiplicity of laser generators. One of the laser levelers is disposed in a top section which is rotatable with respect to a base section. The laser generator within the top section is rotatable through an angle of 90° between the horizontal and the vertical. A second laser generator is disposed within a midsection, located between the base and the top section. The laser generator within the midsection is capable of generating a vertical laser beam.

Abstract: A bagless vacuum cleaner having a removable dust extraction and collection unit. The removable dust extraction and collection unit has an enclosed inlet chamber and an enclosed outlet chamber. The bottom wall of the enclosed inlet chamber is pivotally hinged such that the bottom wall can be alternatively opened and closed. When opened, accumulated dust within the inlet chamber is conveniently gravitated out of the dust extraction and collection unit.

Abstract: A bagless canister vacuum cleaner having a chasse, an air blower and a dust extraction and collection unit is provided. The dust extraction and collection unit has an easily removable inlet chamber and an easily removable outlet chamber. The inlet chamber is substantially cylindrical, and the outlet chamber is disposed concentrically within the upper portion of the inlet chamber. Duct work within the chasse conducts air from the air inlet and into the inlet chamber in tangential fashion, such that air swirls about the inside walls of the inlet chamber. Air within the inlet chamber is then allowed to escape from the inlet chamber into the outlet chamber via a plurality of small holes disposed in the side walls of the outlet chamber. Air within the outlet chamber is exhausted to the blower via a top wall opening in the outlet chamber.

Abstract: A bagless canister vacuum cleaner having a chasse, an air blower and a dust extraction and collection unit is provided. The dust extraction and collection unit has an easily removable inlet chamber and an easily removable outlet chamber. The inlet chamber is substantially cylindrical, and the outlet chamber is disposed concentrically within the upper portion of the inlet chamber. Duct work within the chasse conducts air from the air inlet and into the inlet chamber in tangential fashion, such that air swirls about the inside walls of the inlet chamber. Air within the inlet chamber is then allowed to escape from the inlet chamber into the outlet chamber via a plurality of small holes disposed in the side walls of the outlet chamber. Air within the outlet chamber is exhausted to the blower via a top wall opening in the outlet chamber.

Abstract: A bagless vacuum cleaner having a chasse, an air blower and a dust extraction and collection unit is provided. The dust extraction and collection unit has an easily removable inlet chamber and an easily removable outlet chamber. The inlet chamber is substantially cylindrical, and the outlet chamber is disposed concentrically within the upper portion of the inlet chamber. Duct work within the chasse conducts air from the base of the chasse and into the inlet chamber in tangential fashion, such that air swirls about the inside walls of the inlet chamber. Air within the inlet chamber is then allowed to escape from the inlet chamber into the outlet chamber via a plurality of small holes disposed in the side walls of the outlet chamber. Air within the outlet chamber is exhausted to the blower via a top wall opening in the outlet chamber.

Abstract: A bagless vacuum cleaner having a chasse, an air blower and a dust extraction and collection unit is provided. The dust extraction and collection unit has an easily removable inlet chamber and an easily removable outlet chamber. The inlet chamber is substantially cylindrical, and the outlet chamber is disposed concentrically within the upper portion of the inlet chamber. Duct work within the chasse conducts air from the base of the chasse and into the inlet chamber in tangential fashion, such that air swirls about the inside walls of the inlet chamber. Air within the inlet chamber is then allowed to escape from the inlet chamber into the outlet chamber via a plurality of small holes disposed in the side walls of the outlet chamber. Air within the outlet chamber is exhausted to the blower via a top wall opening in the outlet chamber.