Propelling pencil with cushion sleeve
US5009533A · kind A · utility
12Cited by
7References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 9, 1990 |
| Grant date | Apr 23, 1991 |
| Priority date | — |
| Expiry date | Aug 9, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB43K21/20
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A knock-type propelling pencil includes a lead pipe inserted into an outer cylinder and having a lead chuck at the end portion thereof, a chuck-fastening tube for fastening the lead chuck, a cushion sleeve coming into contact with the chuck-fastening tube and being slidable relative to the outer cylinder, and being urged by a spring. The cushion sleeve has a cushion portion which can be resiliently deformed to absorb excessive writing pressure and thereby preventing breaking of the lead.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.