Ink cartridge with self-closing valve
US6477956B1 · kind B1 · utility
5Cited by
12References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 10, 2001 |
| Grant date | Nov 12, 2002 |
| Priority date | — |
| Expiry date | Aug 10, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41C1/1066
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An improved ink cartridge of the type used to dispense ink in automatic lithographic presses. The ink cartridge comprises a hollow cylindrical body for holding a supply of extrudable ink, a plunger and a dispensing fitment. The improvement comprises a valve member mounted over a central aperture in the dispensing fitment and a flexible molded plastic spring that biases the valve member in the closed position. The valve member opens when subjected to pressure from the ink and closes automatically and completely when the ink pressure is less than the biasing force of the flexible spring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.