Typewriting machines – Key-board or key lever-actuating mechanism
Patent
1998-12-28
2000-05-02
Hilten, John S.
Typewriting machines
Key-board or key lever-actuating mechanism
400490, B41J 516
Patent
active
060564571
ABSTRACT:
The present invention provides a keyboard comprising a cover plate, a base plate, a metal support, and a thin layer membrane. The cover plate comprises a plurality of supporting structures with a plurality of key caps installed on top and is movable in an up-down vertical direction. The thin layer membrane installed below the cover plate comprises a plurality of switches with each switch underlying a key cap for detecting the operation of the plurality of key caps. The metal support installed under the thin layer membrane strengthens the structure of the keyboard. The base plate is installed under the metal support and comprises a plurality of protruding columns of varying heights to accommodate different metal supports of varying thickness. By supporting the metal support of a specific thickness, the protruding columns of corresponding height help to maintain the thin layer membrane at the specified height between the cover plate and the base plate.
REFERENCES:
patent: 4560845 (1985-12-01), Takamura et al.
patent: 5001307 (1991-03-01), Blaser
patent: 5535091 (1996-07-01), Lee
patent: 5810491 (1998-09-01), Muller et al.
patent: 5879088 (1999-03-01), English
Acer Peripherals Inc.
Hilten John S.
Hsu Winston
Nguyen Anthony H.
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