Mechanical pencil
US7128487B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 2002 |
| Grant date | Oct 31, 2006 |
| Priority date | — |
| Expiry date | Sep 24, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB43K21/22
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
In a mechanical pencil, the dispersion range of the diameter of a lead is allowable to a certain extent, but if by chance a lead having the maximum diameter is used the lead may not be delivered. This is because there is exceeded the allowable range of the elastic deformation of an elastic thin film, namely, a lead holding member. The mechanical pencil includes the lead holding member disposed in the neighborhood of the tip of a shaft tube, in which the exterior shape of the lead holding member is formed to be slightly smaller than the interior shape of the shaft tube in which the lead holding member is disposed, and an inner step portion for preventing the dropping of the lead holding member from the shaft tube is disposed in the front portion of the lead holding member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.