Universal parallel ruler device
US4151649A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 8, 1977 |
| Grant date | May 1, 1979 |
| Priority date | — |
| Expiry date | Sep 8, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB43L13/022
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A universal parallel ruler device has a head supported shiftably with its fixed posture being maintained in a desired direction along the surface of a drafting board, a straightedge mounted swivelably in a plane parallel to the surface of the drafting board, an A-D converter for converting the angular position of the straightedge relative to the base line set to any given digital amount, a detector for detecting polarity of the straightedge relative to the base line, i.e. whether the straightedge relative is inclined to the clockwise rotation side of the base line or is inclined to the counterclockwise rotation side, and a display device for displaying the digital angular position of the straightedge and the polarity relative to the base line on the basis of the signal from the A-D converter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.