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Key for Elastic Diaphragm Switch Keyboards

IP.com Disclosure Number: IPCOM000074299D
Original Publication Date: 1971-Apr-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Fazzio, DP: AUTHOR [+3]

Abstract

This plastic key 10 for an elastic diaphragm switch assembly 12 is designed for normal touch without rollover problems. The main key stem 14 has flexible prongs 16 which ride down the sides of a beveled actuating plunger 20 when the key is depressed. As prongs 16 are forced down over the bevel of plunger 20, the prongs are spread apart, creating pressure on actuating plunger 20 which in turn is forced downward and into rubber distributor 22 located in assembly 12 under an elastic diaphragm keyboard face plate, not shown. The actuating plunger 20 deforms rubber distributor 22 and a metallic diaphragm, not shown, located directly under distributor 22, causing the elastic diaphragm switch assembly to make electric contact.

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Key for Elastic Diaphragm Switch Keyboards

This plastic key 10 for an elastic diaphragm switch assembly 12 is designed for normal touch without rollover problems. The main key stem 14 has flexible prongs 16 which ride down the sides of a beveled actuating plunger 20 when the key is depressed. As prongs 16 are forced down over the bevel of plunger 20, the prongs are spread apart, creating pressure on actuating plunger 20 which in turn is forced downward and into rubber distributor 22 located in assembly 12 under an elastic diaphragm keyboard face plate, not shown. The actuating plunger 20 deforms rubber distributor 22 and a metallic diaphragm, not shown, located directly under distributor 22, causing the elastic diaphragm switch assembly to make electric contact. Continuing finger pressure on key 10 causes prongs 16 to move farther down, eventually sliding off the sides of actuating plunger 20 and onto the bottom beveled section 24, thereby releasing the pressure on actuating plunger 20. A smaller extreme angled bevel portion 26 below the bottom of section 24 is arranged to give the operator the feeling of hitting the bottom of the stroke.

A small cylindrical plunger 30 inserted in a central core of the key stem is all that is necessary to incorporate typamatic capabilities into any preselected keys.

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