Browse Prior Art Database

Nonteasable Switch Actuator

IP.com Disclosure Number: IPCOM000080018D
Original Publication Date: 1973-Oct-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Related People

Yarborough, JL: AUTHOR

Abstract

Fig. 1 illustrates a cut-away view of an improved switch actuator of a simple, nonteasable construction. In Fig. 1, the key is shown in the up, or unactuated, position in which the actuator is deformed to give a preload of approximately 50 grams against the key. Keytop 1 is biased at the upward position due to the preload in actuator spring 2, which is trapped between a bottom surface of key slide 3 affixed to keytop 1 and a notch 4 in actuator slide 5, as shown. One end of actuator slide 5 is confined to an opening 6 in housing 7, while maintaining contact between the upper surface of actuator slide 5 and the upper surface 8 of the opening 8.

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Nonteasable Switch Actuator

Fig. 1 illustrates a cut-away view of an improved switch actuator of a simple, nonteasable construction. In Fig. 1, the key is shown in the up, or unactuated, position in which the actuator is deformed to give a preload of approximately 50 grams against the key. Keytop 1 is biased at the upward position due to the preload in actuator spring 2, which is trapped between a bottom surface of key slide 3 affixed to keytop 1 and a notch 4 in actuator slide 5, as shown. One end of actuator slide 5 is confined to an opening 6 in housing 7, while maintaining contact between the upper surface of actuator slide 5 and the upper surface 8 of the opening 8.

Assuming a 50 gram preload deformation in actuator spring 2, a downward thrust by the end of spring 2 which is in notch 4 will, By the lever action produced by the contact between actuator slide and surface 8, indicated as a pivot point P in Fig. 1, produce approximately a 100 gram preload against the surface of the elastic diaphragm switch assembly 9. A bump or protrusion 10 on the lower surface of actuator slide 5 is utilized to actuate a given area of elastic diaphragm switch (EDS) switch assembly 9 mounted on a support plate 11.

An EDS switch of this type will close when 25 to 40 grams of force is applied to an active area such as 12, thereby closing switch contacts 13 and 14.

Fig. 2 illustrates the position of the mechanism when the key is in the actuated position, due to the application of a force F downward on keytop 1. Actuator slide 5 has slid to the right as a result of deformation of act...