Disposable propel-repel pencil
US4544296A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 27, 1980 |
| Grant date | Oct 1, 1985 |
| Priority date | — |
| Expiry date | Oct 27, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB43K21/08
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A mechanical pencil is disclosed that includes a barrel with a non-circular internal bore, a helical coil member that is fitted within the bore and attached to an externally positioned driving member, and a lead positioning means or pusher member that is positioned about and threadably engaged with the coil and constrained by the non-circular bore of the barrel for sliding longitudinal movement therein. The lead positioning means or pusher member includes fins that extend through the coil turns and act as a positioning stop for the writing lead and a lead gripping means for propelling and repelling the centrally disposed writing lead upon the manual rotation of the external driving member that is attached to the coil disposed within the barrel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.