Apparatus for automatically brushing chalk powder off from a bla

Details Apparatus for automatically brushing chalk powder off from a bla Apparatus for automatically brushing chalk powder off from a bla

1994-10-05

1995-10-10

Roberts, Edward L.

Brushing, scrubbing, and general cleaning

Machines

Brushing

15 89, 15311, B43L 2102, A47L 2500

Patent

active

054559766

ABSTRACT:
The invention relates to an apparatus for brushing chalk powder off from an eraser surface of a blackboard eraser in which elastic brushes attached to rotatable shafts of rotatable bodies are brushingly engaged with the eraser surface and are rotated in forward and reverse directions by a motor so that the chalk powder removed from the eraser is collected in chalk powder receiving containers. After the passage of a set time interval, the operation of the apparatus is automatically stopped. A chalk powder containing eraser and the now clean eraser inside the apparatus can be exchanged. Thus, dispersion of powder into the room is prevented.

REFERENCES:
patent: 2306911 (1942-12-01), Schaefer
patent: 3411175 (1968-11-01), Mills
patent: 4549327 (1985-10-01), Johnson
patent: 5075915 (1991-12-01), Rodriguez

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