Level/plumb indicator with tilt compensation
US4852265A · kind A · utility
78Cited by
4References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 8, 1988 |
| Grant date | Aug 1, 1989 |
| Priority date | — |
| Expiry date | Apr 8, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S33/21
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A tool for use in establishing a precise level line or plumb line or line for alignment uses a visible laser diode for projecting the line. The tool is relatively small and compact, drives the laser diode using batteries contained in the tool, and includes tilt compensation for use on surfaces which are not level, up to about 5.degree. off level, for still delivering a truly plumb or truly horizontal beam. A manual selector device is provided for shifting the beam from a vertical orientation to a horizontal orientation when desired. Specific forms of tilt compensation apparatus are disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.