Browse Prior Art Database

Keyboard

IP.com Disclosure Number: IPCOM000091903D
Original Publication Date: 1968-Jul-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Black, DE: AUTHOR

Abstract

When depressed, keyboard key lever 11, drawing A, moves interposer 12 and drops tip 12A below the extremities of fulcrum-stop 13 allowing spring 14 to urge interposer 12 forward striking formed spring 15 and stopping against rod 17. This breaks the contact of membrane switch 16, drawing B. Switch 16 is composed of diaphragm 18, separator 19, and substrate 20. After switch 16 opens, interposer tip 12A rests under the extremity of the fulcrum-stop 13 holding switch 16 in open position. Interposer 12 is now returned by a drive mechanism thus completing a contact cycle. The total unit consists of a multiplicity of these interposers and key levers mounted between sideframes.

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Keyboard

When depressed, keyboard key lever 11, drawing A, moves interposer 12 and drops tip 12A below the extremities of fulcrum-stop 13 allowing spring 14 to urge interposer 12 forward striking formed spring 15 and stopping against rod 17. This breaks the contact of membrane switch 16, drawing B. Switch 16 is composed of diaphragm 18, separator 19, and substrate 20. After switch 16 opens, interposer tip 12A rests under the extremity of the fulcrum-stop 13 holding switch 16 in open position. Interposer 12 is now returned by a drive mechanism thus completing a contact cycle. The total unit consists of a multiplicity of these interposers and key levers mounted between sideframes.

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