Rail type universal parallel ruler device
US4312132A · kind A · utility
0Cited by
5References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1979 |
| Grant date | Jan 26, 1982 |
| Priority date | — |
| Expiry date | Dec 19, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C32/0434
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A rail type universal parallel ruler device wherein a balance weight is provided which is connected to the head by means of a cord or the like and shifts along a vertical rail in a direction opposite to the shifting of the head. A fixed magnet is disposed along almost the entire length of the path of travel of the balance weight, and a magnet is provided on the balance weight opposed to the fixed magnet, and the balance weight is repulsed so as to be suspended as it moves along the path of travel by the magnetic force between the magnets.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.