Mechanical pencil with self-tapping propelling nut and the method of producing same and propelling a lead contained therein
US4505606A · kind A · utility
2Cited by
9References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 21, 1982 |
| Grant date | Mar 19, 1985 |
| Priority date | — |
| Expiry date | Jun 21, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB43K21/08
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A screw feed mechanical pencil having a propelling nut which self-taps on an unthreaded interior barrel wall. The pencil's barrel and split tube are plastic extrusions and a square lead is used to prevent lead rotation during writing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.