Stress measuring rock support device
US5929341A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 1997 |
| Grant date | Jul 27, 1999 |
| Priority date | — |
| Expiry date | Nov 26, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B5/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A stress measuring rock support device is provided, such as a cable bolt or friction stabilizer, which has an internal longitudinal cavity, such as a groove or a flat section on the kingwire or a hollow core in the kingwire or the like. One or more rigid wires or filaments extend in such cavity and their ends are anchored at predetermined anchor points within the cavity. The other ends of the rigid wires or filaments are spring-loaded and are provided with movable actuators having electrical contacts which are in contact with a linear potentiometer and measure the displacement of the actuators resulting from the stretch of the cable. This is then correlated to measure the cable load or strain resulting from the stress applied to the rock support device. The spring-loaded arrangement as well as the linear potentiometer and the actuators with electrical contacts are enclosed within a suitable cover to form an instrumentation head assembly for the rock support device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.