Education and demonstration – Means for demonstrating apparatus – product – or surface... – Chalkboard or equivalent means having easily erasable surface
Patent
1997-06-02
1999-09-28
Ricci, John A.
Education and demonstration
Means for demonstrating apparatus, product, or surface...
Chalkboard or equivalent means having easily erasable surface
434411, B43L 100
Patent
active
059577002
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to writing boards such as the wall-hanging type, stand-supported type, and desktop type of blackboards, white boards, and green boards, in which writing is made on the surface of a recording medium using a writing tool such as a felt-tip marker.
BACKGROUND OF THE INVENTION
Conventionally, these types of writing boards have included boards, as illustrated in laid-open Japanese Patent Application KOKAI No. 7-90214, in which letters, characters and pictures are written on the writing board using a writing tool. When all the information produced by the writing tool is to be erased, the surface of the writing board is wiped with a wiping tool soaked with a cleaning liquid such as water, taking advantage of a chemical reaction for erasing the letters, etc.
However, these conventional writing boards have required all the information on the board to be erased by hand to wipe the board with the erasing tool.
An object of the present invention therefore is to provide a writing board in which all the information is written in ink, erasable with a cleaning liquid, on the surface of the recording medium of the board and is erased automatically with a cleaning liquid.
SUMMARY OF THE INVENTION
In a writing board of the present invention, like the electric board, wherein information is written on the surface of the recording medium using ink that is erasable with a cleaning liquid, an opening of a cleaning instrument is contacted against the surface of the recording medium, the cleaning instrument and/or surface of the recording medium can relatively be moved with respect to each other. On the other hand, a storage container holds a cleaning liquid. A pump is provided and circulates the cleaning liquid through the cleaning instrument and an erasing switch allows the pump to operate and the cleaning instrument and/or recording medium to make relative movement.
For erasing all the information written on the writing board, the erasing switch is turned ON to make the cleaning instrument or recording medium begin relative movement with respect to each other, while the pump is actuated to allow the cleaning liquid in the storage container to circulate through the cleaning instrument. The surface of the recording medium is then applied with the cleaning liquid through the opening of the cleaning instrument. After the written information has been erased, the recording medium and the cleaning instrument stop relative movement, and the pump stops its operation.
In the above-mentioned writing board, it is preferable to provide a valve such as a solenoid valve that shuts off the supply of the cleaning liquid into the cleaning instrument. After the written information has been erased, supply of the cleaning liquid into the cleaning instrument is thus shut off by closing the solenoid valve. The cleaning liquid is then sucked and removed from the cleaning instrument and the pump is stopped. This prevents leakage of the cleaning liquid from the opening of the cleaning instrument after the erasing has been performed.
According to the present invention, it is preferable that the cleaning instrument can freely be placed in contact with or kept apart from the recording medium. Namely, by switching the members and by operating the erasing switch, the cleaning instrument is squeezed against the recording medium when the written information is to be erased or otherwise kept apart from the recording medium. Thus the written information may be erased or not when desired.
According to the present invention, it is preferable that the contact surface of the cleaning instrument that comes into contact with the recording medium is coated with Teflon, a trademark for polytetrafluoroethylene. This prevents friction-caused damage to the surface of the recording medium and reduces frictional resistance between the recording medium and the cleaning instrument during their relative movement.
According to the present invention, the surface of the recording medium is preferably treated with sand mat by blas
REFERENCES:
patent: 1227205 (1917-05-01), Sartakoff
patent: 3163943 (1965-01-01), Bell
patent: 3858265 (1975-01-01), Schlick
patent: 5216776 (1993-06-01), Dennison
patent: 5607312 (1997-03-01), Zhou
patent: 5649828 (1997-07-01), Kawashima
Kunitz Norman N.
Ricci John A.
Ricoh Company
Ricoh Elemex Corporation
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