Patent ID: 8704115
Filing Date: 2014-04-22
Classification: H01H,Y10T

Abstract:
1. A pressure switch comprising: a substrate; a contact pad disposed on a first side of said substrate, said contact pad having a first predetermined shape; a dome switch comprising a dome having a predetermined diameter and a flange surrounding said dome, said flange anchored to said first side of said substrate with said dome pressed against said contact pad with a predetermined preload force that is sufficient to establish an electrical connection between said contact pad and said dome, said flange being anchored to said substrate so that an airtight seal is formed between said flange and said substrate and so that said predetermined diameter of said dome is substantially maintained during deflection of said dome, which substantially removes hysteresis caused by movement of said dome and causes said dome to move substantially elastically during deflection of said dome, said dome having a second predetermined shape that interfaces with said first predetermined shape of said contact pad; at least one passageway formed in said substrate that allows a pressurized medium on said second side of said substrate to flow through said substrate to said first side of said substrate which causes said dome to depress and separate from said contact pad and electrically disconnect from said contact pad whenever said pressurized medium is greater than a first predetermined pressure, and causes said dome to expand and electrically connect to said contact pad whenever said pressurized medium is less than a smaller second predetermined pressure.