Browse Prior Art Database

Buckling Spring Actuator for Membrane Keyboard

IP.com Disclosure Number: IPCOM000046447D
Original Publication Date: 1983-Jul-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Murphy, RD: AUTHOR

Abstract

A buckling spring actuator is utilized to actuate a membrane electrical switch. The buckling spring provides sure actuation of the switch and a tactile feedback to the operator that the switch has been actuated.

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Buckling Spring Actuator for Membrane Keyboard

A buckling spring actuator is utilized to actuate a membrane electrical switch. The buckling spring provides sure actuation of the switch and a tactile feedback to the operator that the switch has been actuated.

Fig. 1 depicts a key assembly 11 in its unactuated state. Operator depression of the keybutton 13 causes keybutton 13 to move downwardly over cylindrical guide 15 against the force supplied by column spring 17. Spring 17 is attached at end 19 to keybutton 13 and rests on bottom housing 21.

As keybutton 13 moves further downwardly, spring 17 catastrophically buckles, as depicted in Fig. 2, causing its end 23 to rock downwardly through hole 25 in housing 21. End 23 of spring 17 thus pushes downwardly on membrane switch 27 located under housing 21, causing the membrane switch 27 to close, thereby indicating key depression.

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