Writing point or tracing element
US4938620A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1988 |
| Grant date | Jul 3, 1990 |
| Priority date | — |
| Expiry date | Jul 26, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB43K8/18
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The housing (1') of a writing point (1) or tracing element for manual ink writing or drawing instruments or for plotter or similar automatic or mechanical tracing machines is or can be linked with a shaft (40) that contains the ink and/works as a holder and/or storage. The housing has also a compensating system and a writing body (1") and if necessary other parts. It is provided with a supply system having in the area of the housing (1') several annular spaces (52 and 57) arranged axially one after the other and having different capillarities, their capillarity increasing one or more times in the direction of the writing body (1"). At least one annular space is conically shaped (53) and has a capillarity different from that of the writing body (1"), increasing in the direction of the latter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.