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US 3,977,798 AGranted
Tubular writing pen
AssigneeKoh-I-Noor Rapidograph, Inc.
InventorLasse Kuparinen
Life of this patent
Estimating the term…
Abstract
An improved writing point assembly for stylographic, or tube pens and a method for making such an improved writing point. The writing tube itself may be formed by a deep drawing operation and then secured, in a surrounding relationship, to the front end of a plastic cylindrical member, which itself may be formed by being injection molded within the writing tube.
Claims1
A writing point assembly for a tube or stylographic writing pen comprising, in combination:
- A. a plastic cylindrical member, having a front end and a rear end, and traversed from end to end by a channel adapted for the passage of ink from an ink reservoir at said rear end, and;
- B. a metal writing tube, having a front end and a rear end, wherein said writing tube is attached, to said cylindrical member, by encompassing, in a surrounding relation, said front end of said cylindrical member, and;
- C. said rear end of said writing tube including a radially inwardly directed annular corrugation engaging a similar annular groove in said front end of said cylindrical member, and;
- D. said front end of said writing tube including a substantially flat face surrounding said front end of said plastic cylindrical member, said flat face being formed to define an ink outlet orifice, said face being work-hardened to define a hard writing surface, wherein;
- E. said ink passage channel in said cylindrical body extends within said writing tube from said rear end to, and directly communicating with, said ink outlet orifice at said flat front face of said writing tube and including a weighted cleaning wire extending axially within said ink passage channel means and into said ink outlet orifice.
2 more elements
Dependencies are inferred from the claim text.