Brushing – scrubbing – and general cleaning – Machines – Wiping
Patent
1983-12-16
1986-06-24
Roberts, Edward L.
Brushing, scrubbing, and general cleaning
Machines
Wiping
15 27, 15 97R, 15221, 434417, B43L 2100
Patent
active
045960593
ABSTRACT:
An automatic dust-removing eraser of a rolling-friction type for use on a blackboard includes: a casing body having an open section or cavity in the central portion; a plurality of different guiding slots vertically formed at both ends of the side walls defining the open section; a spare space provided at each end portion with an escape clack valve and a discharge door respectively disposed in the opposing side walls defining the spare spaces; a pair of supporting members each having integrally-linked parallel plates respectively secured in the guiding slots of the casing body; and a plurality of master rollers and slave rollers mounted within the cavity in interrelated coupling; so that, by means of the matched rotation of the master and slave rollers and the unilateral check action effected from the supporting members, the chalk dust gathered by the master rollers over the surface of the blackboard is automatically removed through self-brushing and discharging action of the slave rollers.
REFERENCES:
patent: 1487052 (1924-03-01), Enomoto
patent: 4080683 (1978-03-01), Yi
patent: 4462134 (1984-07-01), Wang
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