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Momentary Contact Actuator

IP.com Disclosure Number: IPCOM000078827D
Original Publication Date: 1973-Mar-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Mathewson, JA: AUTHOR [+2]

Abstract

Figs. 1A through 1F illustrate consecutive stages in one complete cycle of operation of a momentary contact switch actuator of a structure as shown. In Fig. 1A, the actuator is shown in front and side views positioned above a switch, such as an elastic diaphragm switch, which may be closed by pressure applied to the upper layer thereof at a defined point on its surface. Switch 1 is to be contacted by depressor 2 which is connected via toggle arms 3 to the resilient beam arms 4. These arms are rigidly affixed to key stem 5 which is biased in an upward position by spring 6, to resiliently resist the application of force to the key top 7 affixed to key stem 5.

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Momentary Contact Actuator

Figs. 1A through 1F illustrate consecutive stages in one complete cycle of operation of a momentary contact switch actuator of a structure as shown. In Fig. 1A, the actuator is shown in front and side views positioned above a switch, such as an elastic diaphragm switch, which may be closed by pressure applied to the upper layer thereof at a defined point on its surface. Switch 1 is to be contacted by depressor 2 which is connected via toggle arms 3 to the resilient beam arms 4. These arms are rigidly affixed to key stem 5 which is biased in an upward position by spring 6, to resiliently resist the application of force to the key top 7 affixed to key stem 5.

In Fig. 1B, the key top 7 has been partially depressed to move depressor 2 into initial contact with switch 1. As can be seen, the beam members 4 and key stem 5 move together as a unit. In Fig. 1C, depressor 2 is shown in the position in which the depressor actuates switch 1. This is the maximum force position of the toggle mechanism comprising depressor 2, arms 3, and beams 4.

A slight additional amount of travel in the downward direction, will cause the toggle mechanism to snap overcenter, as shown in Fig. 1D, removing the force from switch 1 and releasing the built-up stresses in the resilient beam arms 4. The key top 7 and spring 6 cooperate to limit the maximum amount of downward travel of the key stem 5, by compressing the spring to its fully closed height. The attached actuato...