Cap for writing instrument
US5957608A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 9, 1998 |
| Grant date | Sep 28, 1999 |
| Priority date | — |
| Expiry date | Jan 9, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB43K23/12
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
Basic configuration of a cap is as follows. When the end face of an elastic seal cylinder arranged in a cap for a writing instrument is caused to abut against and come into tight contact with the end portion of the mouth piece of a barrel cylinder to hermetically seal a point assembly and the opening portion of an air groove, first, the distal end of the point assembly is hermetically sealed with the bottom of the seal cylinder. The inner opening edge portion of the seal cylinder fits on the conical portion of an ink reservoir or of a point assembly support from an intermediate portion of the conical portion, and is gradually attached to the barrel cylinder while widening the opening portion of the seal cylinder in the radial direction. When the end face of the seal cylinder abuts against and comes into tight contact with the end portion of the mouth piece and attachment of the cap is completed, the end face of the seal cylinder and the end portion of the mouth piece are in tight contact with each other throughout the entire circumference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.