Device for finding concealed studs
US5812057A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 1996 |
| Grant date | Sep 22, 1998 |
| Priority date | — |
| Expiry date | Oct 31, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/96066
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A detector device for finding concealed studs in partitioning includes a pair of plates which are supplied with ac via resistors. Amplifiers produce outputs representing the sum and difference respectively of the signals imposed on the plates. The sum signal drives a display enabling circuit including a comparator which enables a display means to operate when the sum signal exceeds a threshold level. The difference signal drives two comparators which control three display device such that one display device is operated only when the detector device is over the center of a stud. The other display devices indicate which way the detector should be moved to place it over the center of the stud.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.