NASA NTRS · 19870000145
Switching Circuit for Shop Vacuum System
Abstract
No internal connections to machine tools required. Switching circuit controls vacuum system draws debris from grinders and sanders in machine shop. Circuit automatically turns on vacuum system whenever at least one sander or grinder operating. Debris safely removed, even when operator neglects to turn on vacuum system manually. Pickup coils sense alternating magnetic fields just outside operating machines. Signal from any coil or combination of coils causes vacuum system to be turned on.
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Burley, R. K.. 1987-03-01. Switching Circuit for Shop Vacuum System. https://ntrs.nasa.gov/citations/19870000145
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