Surveying staffs
US4271598A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 24, 1979 |
| Grant date | Jun 9, 1981 |
| Priority date | — |
| Expiry date | Oct 24, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C15/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A surveyor's levelling staff which comprises an endless graduated band or strip on a hollow elongated body with a portion of the strip to be viewed extending along a longitudinal face of the body and the remainder of the strip disposed within the body. The strip passes around a spring-loaded tensioning roller and a winding and brake roller inside the body. The tensioning roller maintains a predetermined tension on the strip and the winding and brake roller includes a winding handle to move the strip along the longitudinal face of the body and through the body, and a brake which, in the locked position prevents relative movement of the strip.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.