Eraser with dust-collecting means

Details Eraser with dust-collecting means Eraser with dust-collecting means

1975-05-16

1976-10-19

Blum, Daniel

Brushing, scrubbing, and general cleaning

Implements

Combined

15221, 15224, B43L 2102

Patent

active

039862240

ABSTRACT:
A novel structure for a blackboard eraser is provided wherein the eraser comprises a plurality of raised rows of two or more different erasing mediums such as brushes, fiber or cloths laterally spaced and extending parallel on a base support to form an eraser body. The body is connected at its two ends to a resilient dust-collecting frame flush with the raised erasing mediums so that when erasing the blackboard with the eraser the latter completely encloses the corresponding part of the blackboard, guiding the dust along the spaces between adjacent raised rows of erasing mediums and then collecting them in the frame, thereby preventing the dust from flying about and polluting the air. A chalk container may further be formed at the lower part of the eraser for holding the chalks.

REFERENCES:
patent: 122511 (1872-01-01), Bigger et al.
patent: 511812 (1894-01-01), Spence
patent: 522469 (1894-07-01), Kious
patent: 709722 (1902-09-01), Raber
patent: 1942205 (1934-01-01), Elnett
patent: 3110917 (1963-11-01), McPeek
patent: 3418673 (1968-12-01), Kruth

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