Cleaners for chalk erasers

Details Cleaners for chalk erasers Cleaners for chalk erasers

1977-02-28

1978-07-11

Blum, Daniel

Brushing, scrubbing, and general cleaning

Implements

Grids and combs

220 1T, A46B 1706, B43L 2100

Patent

active

040992861

ABSTRACT:
A cleaner for removing chalk powder from a chalk eraser, comprising an upper case having an aperture through which the chalk eraser is inserted, a lower case removably connected with the upper case for collecting chalk powder and a cleaning plate interposed between the upper and lower cases. The cleaning plate has a plurality of ridges and slots against which the chalk eraser is struck. The upper case has a blocking member closing its aperture and which can be spread open to insert a chalk eraser therethrough. Chalk powder falls into the lower case through the slots and accumulates in the lower case.

REFERENCES:
patent: 628615 (1899-07-01), Smith
patent: 1013775 (1912-01-01), Hoffman
patent: 1521398 (1924-12-01), Seyfferth
patent: 1667431 (1928-04-01), Meyers et al.
patent: 1892494 (1932-12-01), Reynolds
patent: 1934144 (1933-11-01), Reiser
patent: 2192896 (1940-03-01), Corson
patent: 3805312 (1974-04-01), Wu
patent: 3918117 (1975-11-01), Plante

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