Two-axis levelling instrument with a single pendulum for projecting a level laser beam
US5108177A · kind A · utility
31Cited by
47References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 12, 1990 |
| Grant date | Apr 28, 1992 |
| Priority date | — |
| Expiry date | Sep 12, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C15/004
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A simple structure for providing a level laser beam. A pendulum is suspended by at least two suspension supports along the line parallel to a path of a laser beam emitted from a laser. An optical element is mounted on the pendulum to intercept the laser beam and reflect it along a path orthogonal to the first path. The pendulum will maintain the optical element in a vertical alignment, and accordingly the beam reflected off the optical element will be horizontal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.