Typewriting machines – Key-board or key lever-actuating mechanism – Key-cap or key-stem structure
Patent
1992-08-05
1994-08-02
Burr, Edgar S.
Typewriting machines
Key-board or key lever-actuating mechanism
Key-cap or key-stem structure
400472, B41J 512
Patent
active
053339614
ABSTRACT:
A keyboard assembly (12) of a telephonic console (14) having multiple modes of operation programmable at a user's site is shipped partly disassembled from a plurality of top mountable key caps with different designations for the same key location corresponding to different modes for permanent top mounting into vacant key holes (18, 20, 22, 24) at the customer site and is preassembled with other key cap assemblies that are installed at a manufacturing site from the underside (12') of the keyboard. The top mountable key cap assemblies (40) have a plurality of resilient arms (56, 58, 62, 64) with flanges (68) on the ends to block removal and wedge-shaped camming surfaces (70, 72) for camming engagement with the sides (50) of key holes to resiliently press the flanges (68) inwardly to enable insertion into the key hole (18, 20, 22, 24) mounted beneath the underside (12') of the keyboard (12) at which location they resiliently return to a locking position (FIG. 4 B) to block removal. A protuberance (48) around the key hole side wall (50) sealingly, slideably mates with a curtain wall (46) of the cap assembly (40) to block entry of fluids and dust into the interior of the keyboard assembly.
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patent: 5172990 (1992-12-01), Weng
"Reduced Noise Keybutton", IBM Technical Disclosure, vol. 31 No. 11 Apr. 1989, pp. 43-44.
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Cooper et al., "Changeable Array Keyboard", IBM Technical Disclosure Bulletin vol. 11, No. 5, Oct. 1968, p. 524.
"Low Cost Versatile Control Panel", vol. 28, No. 7, Dec. 1985, pp. 2948-2949 IBM Technical Disclosure Bulletin.
Capigatti Andrew C.
Zdenek John M.
Burr Edgar S.
Hamann H. F.
Nguyen Anthony H.
Patti C. B.
Rockwell International Corporation
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