Automatic chalk-powder collecting device for blackboard eraser

Details Automatic chalk-powder collecting device for blackboard eraser Automatic chalk-powder collecting device for blackboard eraser

1989-11-13

1990-07-17

Hornsby, Harvey C.

Brushing, scrubbing, and general cleaning

Machines

Wiping

15 27, 15221, 15 99, 15210R, 434417, A47L 1338, B43L 2100

Patent

active

049412256

ABSTRACT:
This invention relates to an automatic chalk-powder collecting device for blackboard eraser; it mainly comprises a body portion, two symmetrical side covers, a powder box, and a powder-collecting assembly. By means of the aforesaid structure and a one-way brake switch in the powder-collecting assembly, the rollers of this invention are controlled to rotate in one direction only. When the present invention is erasing a blackboard back and forth same as a conventional eraser does, the chalk powder on the rubbing cloth can be cleaned automatically and simultaneously. It is deemed that the present invention has greatly improved the drawbacks of the conventional eraser, which must be beaten or cleaned repeatedly in use to cause a lot of powder flying in the air.

REFERENCES:
patent: 4596059 (1986-06-01), Lee
patent: 4642831 (1987-02-01), Roth
patent: 4742594 (1988-05-01), Chen

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