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Actuator for Elastic Diaphragm Switch

IP.com Disclosure Number: IPCOM000073738D
Original Publication Date: 1971-Jan-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 3 page(s) / 75K

Publishing Venue

IBM

Related People

Harris, RH: AUTHOR [+2]

Abstract

An elastic diaphragm switch is operated by moving a ribbon along a path obstructed by a bearing surface on a hammer. A projection on the ribbon presses against the bearing surface on the hammer, displacing the hammer against a supporting spring. Once the hammer is fully displaced, the ribbon passes beyond the bearing surface releasing the hammer to strike the elastic diaphragm of the switch, thereby momentarily closing the switch.

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Actuator for Elastic Diaphragm Switch

An elastic diaphragm switch is operated by moving a ribbon along a path obstructed by a bearing surface on a hammer. A projection on the ribbon presses against the bearing surface on the hammer, displacing the hammer against a supporting spring. Once the hammer is fully displaced, the ribbon passes beyond the bearing surface releasing the hammer to strike the elastic diaphragm of the switch, thereby momentarily closing the switch.

Switch 100, drawings A and B, comprises an actuator 110, a housing 130, impulse impact means 150, and a switch means 180. Actuator 110 comprises a depressable keystem 112 and two ribbons 114. Keystem 112 is slidably mounted in housing 130. Each of the ribbons has two projections near one end, 115 and 116.

Housing 130 includes a keystem guide 132 for guiding keystem 112, inclined ramps 134 and 136 for guiding ribbons 114; keystem return spring 138 for biasing keystem 112 to its rest position, and return spring supports 140, 142 and 144 for supporting the return spring. Means 150 comprises hammers 154, hammer support springs 164, which attach hammers 154 to housing 132 and support the hammers in their rest positions. Hammer 154, drawing C, has a bearing surface 172, against which projection 116 presses to move the hammer. Hammer 154 also has a projection 174 on its lower face which strikes switch means 180 during actuation.

Switch means 180 includes four elastic diaphragm switches 184, which are momentarily closed when struck by hammers 154. Ribbons 114 are flexible and follow a curved path. The curved path is determined by inclined ramps 134 and 136 which guide the flexible ribbons. For clarity the operation of switch 100 is descr...