Key-holding structure of keyboard with curved operating surface

Details Key-holding structure of keyboard with curved operating surface Key-holding structure of keyboard with curved operating surface

1987-07-17

1988-04-05

Pearson, Charles

Typewriting machines

Key-board or key lever-actuating mechanism

Key-board including row of keys having different heights

400489, 340365R, B41J 510

Patent

active

047355204

ABSTRACT:
A keyboard having a key-holder plate for movably supporting multiple keys of substantially the same shape and size in plural parallel rows, multiple switches disposed so as to correspond to the multiple keys and provide electrical outputs upon depression of the keys at their top faces, an upper casing having an aperture which accommodates upper portions of the keys and allows the keys to be operated, and a lower casing cooperating with the upper casing to enclose the multiple switches. The upper casing and said key-holder plate are integrally molded of a synthetic resin, and the key holder plate includes multiple guide portions which have guide holes for slidably guiding the corresponding keys between their non-operated and operated positions. The guide portions have stopper parts which determine the non-operated positions of the keys. The stopper parts are disposed along a curved reference surface which is slightly curved downwardly in a direction perpendicular to the plural parallel rows of the keys, so that an operating surface of the keys which is generally defined by the top faces is downwardly curved following a curvature of the curved reference surface.

REFERENCES:
patent: 4196348 (1980-04-01), Iwakiri et al.
patent: 4294555 (1981-10-01), Galaske et al.
patent: 4363942 (1982-12-01), Deeg et al.
patent: 4467150 (1984-08-01), Leitermann et al.
patent: 4528428 (1985-07-01), Gotoh et al.
patent: 4560844 (1985-12-01), Takamura et al.
Injection Molding of Plastics, Reinhold Pub. Corp., NY, by Thomas, 1947, pp. 302-313.

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