Browse Prior Art Database

Keyboard with Mercury Contacts

IP.com Disclosure Number: IPCOM000094041D
Original Publication Date: 1966-May-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Gergaud, F: AUTHOR [+2]

Abstract

In this keyboard, switching is performed upon action on mercury-filled, silicon rubber tubes.

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Keyboard with Mercury Contacts

In this keyboard, switching is performed upon action on mercury-filled, silicon rubber tubes.

The keyboard comprises a plurality of tubes 1...5, as in drawing A, allowing current to flow via the mercury contained by them. These tubes are positioned into grooves 6' formed in plate 6. Below keys 7, some grooves 6' can be interrupted as indicated in cross-section in drawing B. Groove 6' associated with tube 2 is shown interrupted. Upon pushing a key, part 7' pinches off the nongroove protected tubes causing current to switch off in the corresponding channel. Those tubes whose grooves are not interrupted, e.g., tube 3 in drawing C, are not acted upon by part 7' of key 7.

By properly choosing both groove number per key and interrupted groove number, a signal code to be sent is obtained. Such occurs upon depressing the subject key, the code varying from one key to another.

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