Projection-retraction mechanism for a writing instrument
US4529328A · kind A · utility
15Cited by
6References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 6, 1983 |
| Grant date | Jul 16, 1985 |
| Priority date | — |
| Expiry date | Sep 6, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB43K7/12
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A two-part barrel sleeve includes an internal spring finger which rides in a spiral groove in the combined ink reservoir and barrel of a ball pen, the spiral groove having a detent at its rear end to provide a snap-action as the barrel sleeve is retracted to its rearmost position exposing the writing tip for normal use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.