Browse Prior Art Database

Hydraulically Controlled Keyboard Interlock Mechanism

IP.com Disclosure Number: IPCOM000076227D
Original Publication Date: 1972-Jan-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Easton, KC: AUTHOR

Abstract

This hydraulically controlled keyboard prevents simultaneous operation of two keys. It also provides a single mechanism for snap action, common to all or a group of keys on a keyboard, for placing keys under the control of the same tension and release mechanism.

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Hydraulically Controlled Keyboard Interlock Mechanism

This hydraulically controlled keyboard prevents simultaneous operation of two keys. It also provides a single mechanism for snap action, common to all or a group of keys on a keyboard, for placing keys under the control of the same tension and release mechanism.

The keyboard has base 1 in which is formed a number of chambers 2 and connecting channels 3. Chambers 2 are covered with a flexible diaphragm 4, which is connected to each key actuator 6 of keyboard switch units 5. A portion of the diaphragm covering right chambers 4 is connected to a stem 11 of pressure release regulator 10 for adjusting the snap action. Chambers 2 and channels 3 are filled with fluid 17 in an amount equal to the volume displaced when all keys are in a nonoperational normal position and regulator 10 is in a nonoperated normal position. In the normal position, the fluid level in chambers 2 is aligned with or slightly spaced from diaphragm 4. Stem 11, guided by metal hub 12, has a magnetic ring 13 on its upper portion for exerting magnetic attraction between hub 12 and ring 13. Return and pressure adjust spring 14 is supported by an upper end of stem 11 and tension adjust screw 15.

When any one of keys 7 is selectively depressed, the depression of a single key causes pressure to transmit to other chambers to prevent simultaneous operation. As soon as the pressure becomes greater than the counter pressure exacted by regulator 10, stem 11...