Keyboard with an optional metal support for strengthening its st

Details Keyboard with an optional metal support for strengthening its st Keyboard with an optional metal support for strengthening its st

1998-09-22

1999-11-09

Burr, Edgar

Typewriting machines

Key-board or key lever-actuating mechanism

Including means generating a signal for type selecting or...

200517, 200344, 200 5A, B41J 512, H01H 1370

Patent

active

059801352

ABSTRACT:
The present invention provides a keyboard which can take an optional metal support for strengthening its structure. It comprises a cover plate with a plurality of vertical housings, a base plate mounted on the cover plate with a plurality of protruding pads installed under the vertical housings of the cover plate, a plurality of keys that are vertically and movably installed within the vertical housings, a membrane installed between the cover plate and the base plate comprising a plurality of switches. When any key is depressed, the underlying switch is pressed between the plunger of the key and the underlying protruding pad, and generates a corresponding sensing signal. The keyboard may also comprise a metal support installed between the cover plate and the base plate for increasing structural strength.

REFERENCES:
patent: 4375585 (1983-03-01), Lee
patent: 4532575 (1985-07-01), Suwa
patent: 4555601 (1985-11-01), Taguchi
patent: 5278372 (1994-01-01), Takagi et al.
patent: 5574446 (1996-11-01), Dittrich et al.
patent: 5630501 (1997-05-01), Tsay
patent: 5738450 (1998-04-01), Lukosch

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