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

Claim 3:
4. The dust extractor of claim 3, wherein the circular housing includes a first plurality of openings and a second plurality of openings therein; the rotatable cover rotatably includes a third plurality of openings and a fourth plurality of openings therein, and wherein:
in the first orientation, the first plurality of openings is aligned with the third plurality of second openings but the second plurality of openings is not aligned with the fourth plurality of openings so the airflow stream passes in the first direction from the aperture, through the first plurality of openings and the third plurality of openings, and into the fan, and
in the second orientation, the first plurality of openings is not aligned with the third plurality of second openings but the second plurality of openings is aligned with the fourth plurality of openings so the airflow stream passes from the fan, through the second plurality of openings and the fourth plurality of openings, and into the aperture in the second direction.