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Snap Action Elastic Diaphragm Switch Mechanism

IP.com Disclosure Number: IPCOM000075816D
Original Publication Date: 1971-Nov-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Harris, RH: AUTHOR

Abstract

This switch comprises a movable key stem 1, which is preloaded with a helical compression spring 2 to resist displacement of key button 3 up to some desired loading point. Perpendicular to and mounted on the lower portion of the key stem are four radial cantilever spring arms 4. The length of these cantilever arms is designed to engage with an internal boss or cocking ring 5, when the key stem is depressed. Continued depression of the key stem deforms the spring arms 4 and stores energy in them. Eventually, as the key stem is pushed further, these spring arms slide off the cocking ring, allowing the arms to snap back into their undeformed shape. A dimple 6 located at the end of each spring arm impacts an elastic-diaphragm switch 7 to cause a short interval of switch closure.

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Snap Action Elastic Diaphragm Switch Mechanism

This switch comprises a movable key stem 1, which is preloaded with a helical compression spring 2 to resist displacement of key button 3 up to some desired loading point. Perpendicular to and mounted on the lower portion of the key stem are four radial cantilever spring arms 4. The length of these cantilever arms is designed to engage with an internal boss or cocking ring 5, when the key stem is depressed. Continued depression of the key stem deforms the spring arms 4 and stores energy in them. Eventually, as the key stem is pushed further, these spring arms slide off the cocking ring, allowing the arms to snap back into their undeformed shape. A dimple 6 located at the end of each spring arm impacts an elastic-diaphragm switch 7 to cause a short interval of switch closure. However, since the spring arms will snap only once to the extreme position which actuates the elastic-diaphragm switch, after the initial impact the switch is open, and successive keys may be depressed without restoring this key to its initial position because only one output signal from each key will be obtained. These spring arms snap back over the cocking ring 5 when finger pressure is released on the key stem. The switch is now ready for another key stroke.

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