Expandable and compressible keyboard

Details Expandable and compressible keyboard Expandable and compressible keyboard

1998-08-03

1999-09-14

Burr, Edgar

Typewriting machines

Key-board or key lever-actuating mechanism

4004912, 400492, 361680, B41J 508

Patent

active

059511788

ABSTRACT:
A keyboard is provided having a lower frame with an elastic member installed on the surface thereof. An elevation plate is installed on the lower frame capable of ascending or descending by an elastic force of the elastic member. A pair of guide plates are separately installed above the elevation plate capable of moving toward or away from each other in a horizontal direction and having a plurality of key holes and guides. Switch units are respectively installed on the lower frame, above the elevation plate and on the bottom surface of the guide plate, and a linkage of key pad assemblies are each installed, capable of compressing or extending by being guided by a guide of the guide plate and having a key for operating a switch of the switch unit directly or by inserting in a key hole of the guide plate.

REFERENCES:
patent: 5141343 (1992-08-01), Roylance et al.
patent: 5612692 (1997-03-01), Dugas et al.
patent: 5654872 (1997-08-01), Sellers
patent: 5677826 (1997-10-01), Sellers
patent: 5767464 (1998-06-01), Dyer et al.
patent: 5793605 (1998-08-01), Sellers
patent: 5812116 (1998-09-01), Malhi
patent: 5842798 (1998-12-01), Su
patent: 5850194 (1998-12-01), Lin
patent: 5874696 (1999-02-01), Hayashi et al.

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