Patent ID: 11897158
Assignee: URSCHEL LABORATORIES, INC.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. An impeller adapted to be coaxially mounted within a cutting head for rotation about an axis of the cutting head, the impeller comprising:
a lower plate having an upper surface, a lower surface, and a perimeter;
paddles configured with the lower plate to direct material placed on the lower plate in a radially outward direction of the impeller when the impeller is rotated, at least one of the paddles having a face that contacts the material when the impeller is rotated and an outer radial extent that is adjacent the perimeter of the lower plate; and
at least a first exit hole located in the lower plate adjacent the perimeter of the lower plate and touching the face of the at least one of the paddles, the first exit hole having a wall section that completely closes the first exit hole along the perimeter at the upper surface of the lower plate, the first exit hole extending through the lower plate to define a passageway connected to the upper surface, wherein a foreign debris that is under influence of centrifugal forces generated by the rotation of the impeller and has a trajectory along the face of the at least one of the paddles and contacts the face encounters the first exit hole.