Strain monitoring system
US4858472A · kind A · utility
Inventors
Key dates
| Filing date | Aug 25, 1988 |
| Grant date | Aug 22, 1989 |
| Priority date | — |
| Expiry date | Aug 25, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S73/01
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A vibrating wire strain meter has a steel proving ring across the bore of which extends a taut wire. The outer surface of the proving ring has sloping or tapered grooves extending axially along the entire length of the ring. A pair of diametrically opposed wedges sloping at the same angle as the grooves are used to wedge the proving ring in a borehole. The tapered grooves provide positive guiding of the wedges such that the device can be positioned accurately and repeatably in relation to the borehole wall. Preferably, the wire extends across a diameter which is perpendicular to the diameter on which the grooves and wedges are located. A novel tool for inserting and withdrawing the strain meter is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.