Education and demonstration – Means for demonstrating apparatus – product – or surface... – Chalkboard or equivalent means having easily erasable surface
Patent
1992-04-16
1993-01-05
Wilson, John J.
Education and demonstration
Means for demonstrating apparatus, product, or surface...
Chalkboard or equivalent means having easily erasable surface
434408, 434421, B43L 100, B43L 2300
Patent
active
051765225
ABSTRACT:
A display device upon which erasable indicia may be written comprises a rigid frame encompassing a planar marking surface and corners joining elements of the frame. The frame comprises an elongated top spaced apart from a parallel, elongated bottom, and a pair of spaced apart sides extending perpendicularly between the top and the bottom. The sides and top are formed from a single continuous piece of aluminum extrusion having a generally J-shaped cross section. A similar extrusion forming the bottom comprises an added outwardly extending tray. The planar marking surface is preferably fiberboard, spray coated with polyurethane. Crimps defined in the frame secure the board. Each upper corner of the device is reinforced by a resilient, snap fit hanging bracket which is offset from the back of the board to engage a fastener. A pair of L-shaped modular corners join the frame sides to the bottom. Each corner comprises a base, a front, and a rear wall extending upwardly from the base forming a channel, an offset snap fitting system, and an end wall. An outwardly projecting ledge concurrently mates with an end of the bottom and its tray. The channel receives an end of one side. Its walls are notched to accommodate the J-shaped configuration of extrusions. The offset snap tabs are defined by the walls for captivating and mating with an end of one side. The closed end wall extends between the front and rear walls and the base.
REFERENCES:
patent: 80410 (1868-07-01), Heneage
patent: 2456103 (1948-12-01), Amstutz
patent: 2679700 (1954-06-01), Urbain
patent: 3432944 (1969-03-01), Ishida
patent: 3965601 (1976-06-01), Nielsen
patent: 5035626 (1991-07-01), Persing
Carver Stephen D.
Cherichetti Cindy A.
Wilson John J.
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