Rail type universal parallel ruler device
US4430805A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1982 |
| Grant date | Feb 14, 1984 |
| Priority date | — |
| Expiry date | Aug 24, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S33/01
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A rail type universal parallel ruler device comprising a drawing board, a horizontal rail mounted on the drawing board, a horizontal cursor mounted shiftably on the horizontal rail, a vertical rail connected to the horizontal cursor, a vertical cursor mounted shiftably on the vertical rail, and a head connected to the vertical cursor, the improved rail type universal ruler device wherein a magnetic member is disposed on each of the cursors and rails for guiding the cursors and/or on a tail portion of the vertical rail and the side of drawing board for guiding the tail portion of the vertical rail, and magnetic force is caused to work between the magnetic members in a direction where the cursor is floated relative to the surface of rail and/or a direction where the tail portion of the vertical rail is floated relative to the surface of the drawing board side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.