Land vehicles – Wheeled – Attachment
Patent
1994-02-01
1996-12-31
Ellis, Christopher P.
Land vehicles
Wheeled
Attachment
200 6154, 200 5A, B60R 2120
Patent
active
055886736
ABSTRACT:
A low profile membrane switch adapted for use over an automobile steering wheel airbag assembly for actuating a horn. The low profile membrane switch is comprised of an opposing pair of flexible electrodes separated by a dielectric layer. The dielectric layer has a unique pattern defining opposing electrode contact portions. A plurality of integral outwardly-extending protrusions are screen printed on the exterior surface of each flexible electrode, one over each of the opposing contact portions. These protrusions help concentrate an applied force to bring the respective electrode contact portions together to make electrical contact with the other. The opposing contact portions are defined by the dielectric pattern, and have a high density to insure redundancy and closure of the switch when one depresses the membrane switch with one's hand, and to insure the switch does not inadvertently close when flexed. An applied force of as little as four pounds causes closure of the membrane switch, even when positioned over a resilient airbag device.
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Green Mark
Hartline Robert B.
Ellis Christopher P.
The Bergquist Company
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