Hand-held laser level grade checking device
US5784792A · kind A · utility
Inventor
Key dates
| Filing date | May 13, 1996 |
| Grant date | Jul 28, 1998 |
| Priority date | — |
| Expiry date | May 13, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S33/21
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A tool for use in checking the level or grade of the ground surface in a construction area or site using a daylight visible wavelength semiconductor laser diode module to project a laser beam from the location of interest to a location where the elevation or the amount of cut or fill is known. The tool is a relatively small, hand-held and compact device that utilizes batteries contained within the tool to power the laser diode. The laser diode module fits within a module plug that fits within a module plug compartment in the front of the tool. A front end cap encloses the laser diode module and the module plug in the tool. The laser beam emitted from the tool is in axial alignment with an edge or ridge on outside surface of the tool. A bubble level ensures that the tool is held parallel to the ground during use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.