Abstract: A clog indicating device indicating clogging of a dust collecting filter in a dust collector is disclosed. The dust collector includes on an upper region of its casing an exhaust port opening upward, and a cover member is mounted interspatially above the exhaust port. A colored indicating float is so located as to be movable upward between the exhaust port and the cover member due to pressure of an air exhausted from the exhaust port. Clogging of a dust collecting filter is indicated according to a degree of exposure or a position in an up and down direction of the indicating float between the exhaust port and the cover member.

Abstract: A dust collector includes a housing provided with a suction port and a discharge port, a motor-driven fan located in a fan chamber in the housing, an air suction chamber located between the suction port and the fan chamber, a main filter located in the air suction chamber, a drum member that is so located in the fan chamber as to enclose the fan, and a drum filter mounted around an outer circumferential plane of the drum member. The main filter is comprised of a box-shaped filter case that is ejectable from the air suction chamber and two or more filter elements that are set in the filter case in layers, and the filter elements are selected from a plurality of filters which have the same or different performances.

Abstract: A clog indicating device indicating clogging of a dust collecting filter in a dust collector id disclosed. The dust collector includes on an upper region of its casing an exhaust port opening upward, and a cover member is mounted interspatially above the exhaust port. A colored indicating float is so located as to be movable upward between the exhaust port and the cover member due to pressure of an air exhausted from the exhaust port. Clogging of a dust collecting filter is indicated according to a degree of exposure or a position in an up and down direction of the indicating float between the exhaust port and the cover member.