| 摘要 |
The writing tip of a ball point pen is mounted to an ink reservoir by a resiliently deformable member defining part of an ink passageway from the reservoir to the writing tip and supporting the tip for axial movement of the tip relative to the reservoir. A check valve prevents flow of ink from the passageway to the reservoir and writing pressure on the tip distorts the resilient member in a manner to apply pressure to the ink trapped in the passageway. In some forms an air bubble or equivalent pressure accumulator is incorporated in the device and in some forms the check valve is normally open and is closed by initial movement of the writing tip upon applying writing pressure thereto. |
