US 3802788 A
A cap for a stylographic drafting or lettering pen having a liner to limit the air space around the inking nib and to seal the space from the outside air, and a soft, flexible material to seal the tip of the inking nib.
Description (OCR text may contain errors)
United States Patent 1 1 A Danjczek STYLOGRAPHIC PEN CAP  Inventor: William E. Danjczek, Easton, Pa.
 Assignee: Koh-I-Noor Rapidograph, Inc.,
 Filed: July 13, 1972 [211 App]. N0.: 271,438
52 us. c|....;.... .401/194, 401/258  lm. Cl 1343115/12, 843k 1/10  Field of Search 401/258-260,
 References Cited UNITED STATES PATENTS 1,523,904 U192? Sato; 401/243 X [451 Apr. 9, 1974 3,475,103 10/1969 Danczek 401/258 X 2,547,803 4/1951 Adams 401/246 X 2,713,848 7/1955 Miessner 401/243 X FOREIGN PATENTS OR APPLICATIONS 1,051,115 12/1966 Great Britain 401/245 13,900 6/1907 Great Britain.... 401/194 Primary Examiner-Lawrence Charles 57 t ABSTRACT A cap for a stylographic drafting 0r lettering pen having a liner to limit the air space around the inking nib and to seal the space from the outside air, and a soft, flexible material to seal the tip of the inking nib.
.- 1 '3 Claims, 3 Drawing Figures STYLOGRAPHIC PEN CAP BACKGROUND OF THE INVENTION The present invention is useful for all pens of the type used for drafting, lettering, or writing in which the ink is applied to the drafting, lettering or writing surface through a capillary tube supplied with ink from an ink reservoir.
SUMMARY OF THE INVENTION FIG. 2 is a transverse sectional view showinginterior ribs; and
FIG. 3 is an exploded view of the cap, partially in section.
Referring now in greater detail to the drawings, a stylographic pen or the like generally designated is shown inphantom lines having the cap generally indicated at 12 attached-thereto. The cap, 12 consists of an outer sleeve14 having contained therein a liner 16 1 adapted to contain a point or ink-ing nib sealing element 18. The end of the outer sleeve 14 is closed by means of a removable cap shaped button 20 while the opposite end thereof is interiorally provided with screw threads at 22 for mating engagement with exterior threads 24 on pen 10 in a usual manner.
The sleeve 14 includes an interior shoulder 26 which serves to limit the depth of insertion of liner 16 by coacting with shoulder 28 on liner l6. Liner 16 is provided with four or more ribs or vanes shown at 30 and 32, and inner end compartment 34 adapted for containing. sealing element 18 and separated from the remainder of the interior 36 by means of-a retaining ring 38. The end of sleeve 16 opposite compartment 34 is provided with a tapered sealing edge 40.
The outer sleeve 14 is preferably constructed of a fairly rigid plastic and includes cylindrical portions at 42 and 44. Liner 16 is preferably constructed of a pliable plastic, such as polyethylene and has a sliding friction fit into the sleeve 14 coacting with cylindrical surface 42. Button 20 is also made of a fairly rigid plastic, which can be made of various colors to provide a color coding system for identifying the size of the pen. The button can also be stamped or engraved as indicated at 46 with the size number of the pen. The button 20 has a press fit into the open end of sleeve 14 in operative engagement with cylindrical portion 44 and has a press fit over vanes 32 on liner 16. This construction, including the combination of the button 20 and the liner l6, permits easy disassembly or pushing out from the sleeve 14 for cleaning and can be easily replaced in their operative position. I
The sealing element 18 is preferably made of a soft and yielding material and is pressed into inner end compartment 34 and held in place therein by means of the retaining ring 38. While the sealing element is shown as being approximately cylindrical, it is contemplated that this can be shaped as a sphere for easy insertion and the various configurations all effectively serve the same end result.
As shown in the drawings, button 20 projects slightly above the'end of sleeve 14 so that its color, if used, is visible from the side of the cap as well as from the top.
the liner 16, preventing outside air from entering the interior space 36 of the liner. The interior of liner I6 is so designed that there is a limited air space provided between the pen nib which projects into this space and the interior of the liner. When the cap is in'its fully closed position on the pen body, the end of the writing tube of the pen nib presses slightly into the surface of the sealing element l8.
In stylographic pens of this type, one of the most common difficulties encountered is having the ink in the writing tube of the pen nib dry up after being stored for a short period of time with the cap placed securely on the pen body. The present invention eliminates this condition by sealing the area around the pen nib and by .further sealing the end of the writing tube. With a cap designed in accordance with the present invention, a pen can be left for a considerable period of time with the cap in place and the pen will start working immediately when removed from the cap without the necessity of shaking the pen to clear dried ink out of the writing tube, as the ink in the tube does not dry up.
While a preferred embodiment of the invention has been shown anddescribed herein, manifestly, minor changes can be effected therein without departing from the spirit and scope of the invention as defined in and limited solely by the appended claims.
' What is claimed is:
1. A stylographic pen cap comprising: A. an outer generally cylindrical open ended sleeve;
B. said sleeve having an interior shoulder;
C. a resilient material liner open at one end engaged in said sleeveintermediate the ends thereof;
- D. said liner having an externalshoulder, engagement between said shoulders of said sleeve and'said liner limiting the depth of insertion of said liner in said sleeve;
E. a button engaged in and closing one end of said sleeve;
F. the opposite end of said sleeve adapted for operative engagement with and over a pen body having a pen nib thereon;
G. said liner having first and second sets of exterior vanes thereon, said first set being positioned at the closed end thereof and said second set being disposed between said first set and said retaining shoulder;
H. said button having a press fit :into said sleeve and a press fit over said first set of vanes, said second set of vanes having a press fit in the interior of said sleeve above said engaging shoulders; I. a sealing element in said liner at the end thereof remote from the open end;
4 retaining said sealing element in position.
3. A stylographic pen cap as claimed in claim 1, the interior of said sleeve being of a truncated conical configuration tapering inwardly toward the closed end thereof, the configuration of said liner being adapted to limit air space between a pen nib and the interior of said liner.