Marking instrument
AssigneeParker Pen Products
InventorsNeville Edgar Andrews, Glenn Andrew Groom, Mark Harrison
Life of this patent
Estimating the term…
Abstract
A marking insturment having a fluid reservoir (1) and an application tip. A valve (7, 12, 18) controls flow of fluid from the reservoir (1) to the tip. A transfer chamber (21) is located between the reservoir and tip and is assocaited with the reserovir housing (1) in said manner as to be reduceable in volume.
Claims6
A cartridge for a marking instrument, comprising a body enclosing a reservoir chamber having an axis, a transfer chamber, a valve device for controlling communication between the reservoir chamber and transfer chamber, the valve device having a valve seat and a valve member including a sealing portion for co-operation with the seat and an actuating portion exposed on one side to the pressure in the transfer chamber and on the other side to ambient atmospheric pressure, the valve seat and valve member being assembled in substantially coaxial alignment with the axis of the reservoir chamber,
- wherein the valve seat comprises a cylindrical surface, and the valve member includes a cylindrical portion for co-operation with the seat and an actuating diaphragm attached to one end of the cylindrical portion of the valve member.
Dependencies are inferred from the claim text.