Key-holding structure of a keyboard with curved operating surfac

Details Key-holding structure of a keyboard with curved operating surfac Key-holding structure of a keyboard with curved operating surfac

1984-06-25

1985-12-24

Scott, J. R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200159B, 200293, 235145R, 400488, H01H 900, H01H 1370

Patent

active

045608440

ABSTRACT:
A keyboard having multiple key-switches, wherein a surface generally defined by top faces of keys of the key-switches is downwardly curved in a plane perpendicular to rows of the keys, comprising an upper casing of synthetic resin which includes a top frame portion having a rectangular aperture and side walls defining right and left sides of the aperture. The top frame portion has downward extensions extending downwardly from the side walls. The upper casing further comprises a key-holder plate portion of planar flat shape for supporting the rows of the keys perpendicular to the right and left sides of the aperture. The top frame portion and the key-holder plate portion are molded integrally into the upper casing such that transversely central areas of right and left side end regions of the key-holder plate portion are connected to the downward extensions of the top frame portion, and such that the key-holder plate portion is spaced from the downward extensions, except at the transversely central areas of the side end regions. The keyboard comprises a holding device for holding the key-holder plate portion curved in cross section across the rows of the keys.

REFERENCES:
patent: Re30435 (1980-11-01), Fukao
patent: 3311210 (1967-03-01), Peroni
patent: 4271333 (1981-06-01), Adams et al.
patent: 4294555 (1981-10-01), Galaske et al.
patent: 4363942 (1982-12-01), Deeg et al.
patent: 4423464 (1983-12-01), Tamura et al.
patent: 4440515 (1984-04-01), Nassimbene
patent: 4467150 (1984-08-01), Leitermann et al.

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