Patent ID: 11904424
Assignee: BLACK & DECKER, INC.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A dust extractor for use with a power tool comprising:
a housing forming a dust collection chamber and a main chamber separated from one another via an internal wall having an aperture;
an electric fan disposed within the main chamber to generate an airflow stream through the dust collection chamber and the aperture;
a shroud mounted to the housing in fluid communication with the dust collection chamber;
a filter assembly located on the aperture such that the airflow stream flowing between the dust collection chamber and the main chamber passes through the filter assembly and the aperture; and
a valve assembly disposed within the main chamber configured to change a direction of the airflow stream through the aperture,
wherein, during a normal operation of the dust extractor, the valve assembly is configured in a first orientation to guide the airflow stream in a first direction in which the airflow stream is introduced from outside the housing and through the shroud into the dust collection chamber and includes dust particles generated by an operation of the power tool, and the filter assembly traps the dust particles as the airflow stream passes from the dust collection chamber and through the aperture into the main chamber; and
during a backflush operation of the dust extractor, the valve assembly is configured in a second orientation to guide the airflow stream in a second direction in which the airflow stream passes from the main chamber and through the aperture and collects the dust particles trapped by the filter assembly to clean the filter assembly as it passes into the dust collection chamber.