US3822949A - Ball point pen back end closure - Google Patents
Ball point pen back end closure Download PDFInfo
- Publication number
- US3822949A US3822949A US00060318A US6031870A US3822949A US 3822949 A US3822949 A US 3822949A US 00060318 A US00060318 A US 00060318A US 6031870 A US6031870 A US 6031870A US 3822949 A US3822949 A US 3822949A
- Authority
- US
- United States
- Prior art keywords
- sheath
- plug
- reservoir
- cellulose acetate
- pen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K7/00—Ball-point pens
- B43K7/02—Ink reservoirs; Ink cartridges
- B43K7/08—Preventing leakage
Definitions
- Conventional ballpoint pens include an ink or fluid reservoir from one end of which'the typicalapplicator or writing tip protrudes. This tip, of course, is in contact with the ink and the opposite end of the reservoir is commonly open to the atmosphere so that air may enter the reservoir and displace the writingfluid as it is expelled from the writing tip. Ordinarily, the meniscus of the ink column'or a follower prevents the ink from flowing back through the open end of the reservoir, however, if the pen is jarred violently or a break occurs in the ink film at the ballpoint, the ink may leak from the open back end'of the reservoir. Leakage'of this type is quite undesirable since it may soil not only the users work product, but also his wearing apparel.
- the cause usually lies largely in the fact that the'pores of thestopper are toolarge.
- the pores of the stopper are too small, either in the stopper material itself as initially'formed, or as a result of itscompression during installation in the reservoir.
- This invention provides a backend pen plug construction that is readily adaptable to high volume productivity because of the insertion and cut-off technique which may be employed in the manufacturing assembly process.
- this plug construction includes a plastic sheath within which there is retained a bundle of synthetic filamentous material.
- this back-end plug provides a reliable stopper means that may be used inside a separate ink cartridge intended for use in a pen or in the reservoir of a pen that is either directly filled or employs a cartridge.
- FIG. 1 is an exploded partially cross-sectioned plan view of a typical ballpoint pen incorporating the airperrneable plug of this invention
- FIG. 2 is an enlarged cross-section of an extended length of air-permeable plug material prior to incorporation in a ballpoint pen or similar writing instrument;
- FIG. 3 is a transverse cross-section taken along line 3-3 of FIG. 1.
- the reference numeral l0 designates a typical ballpoint pen.
- This pen further includes a barrel member 11 interior of which is a fluid reservoir 14, a writing tip or applicator 12, and-a stopper or back-end plug 16 which is airpermeable yet forms a positive obstruction to writingfluids.
- the stopper 16 will permit the ingress of air to displace theoutgoing ink at the writing tip and yet will prevent theback flow of ink 18 out of'the reservoir 14.
- a cap member 20 to shield the tip 12 when the pen is not in use.
- the stopper or back-end plug 16 is a sheathed bundle of fibers and is more fully described hereinbelow. Such stopper, however, is positioned at the rear the fluid reservoir 14in a typical press type fit. It should also be obviousfrom FIG, 1 that this form of stopper may be equally effectively used in the back-end portion of a ballpoint pen or similar writing fluid cartridge. Similarly, two or more stoppers of this type may be'employed in series and when several are so used, they may either abut or be spaced from one another. In any event, an air space 22 should be retained between the stopper or stoppers and the writing fluid or ink 18.
- FIG. 2 illustrates in cross-section the intermediate tubular product 16A from which the air-permeable plugs 16 are severed during the pen manufacturing sequence.
- the cellulose acetate fibers may be crimped and bulked prior to their encasement in the sheath 26.
- polyester materials for example, polyester materials
- such added fibers would be uncrimped and would be positioned on the periphery of the bundle adjacent the sheath 26. Further, it is considered practical to use up to 40 percent of the total bundle of polyester material in these applications.
- an intennixture of natural (mercerized cotton) and synthetic fibers may also provide an effective stopper.
- the cotton will lend strength to the bundle as it is being processed into plug form and may include as many as 50 such threads.
- the sheath 26 will preferably have an inside diameter of between about 0.025 inch and 0.250 inch and be made of a suitable plastic such as polypropylene or the like.
- Plug material 16A therefore may be manufactured by extruding the sheath over a suitably arranged filamentous bundle typical of which is six strands of 240 ends each.
- the ink may find its way into the interior of the pen barrel and thereby displace the ink 18.
- the ink may flow to the rear of the barrel 11 and, of course, begin to permeate the plug.
- the dense synthetic fiber bundle and particularly the cellulose acetate will attenuate this flow and thereby begin a plugging action within the bundle.
- contact of the acetate with typical pen inks produces a swelling action which further compresses the bundle and effectively produces a positive blockage to further flow as well as the ingress of air.
- An air-permeable plug adapted to act as a positive obstruction to writing fluids typically used in writing implements and comprising a substantially continuous sheath having an inside diameter of between about 0.025 and 0.250 inches and a low twist substantially continuous parallelly arranged filamentous material having a total denier of between about 3,000 and 25,000 encased in said sheath and further characterized by its perviousness to air and its imperviousness to writing fluids when exposed to and contacted therewith.
- a plug according to claim 2 wherein said filamentous material further includes a plurality of substantially continuous parallelly arranged polyester fibers positioned around the periphery of said cellulose acetate and adjacent said sheath.
- said filamentous material further includes a plurality of substantially continuous parallelely arranged cotton threads intermixed with said cellulose acetate.
- a plug according to claim 1 wherein said sheath between about 0.025 and 0.250 inches in diameter and is of a polypropylene construction.
- Awriting implement including in combination a fluid reservoir containing an ink supply, an applicator in contact with said ink supply and a back-end plug means comprised of a substantially parallelly arranged bundle of filamentous material having a total denier of between about 3,000 and 25,000, said means being further adapted to permit passage of atmospheric air while preventing backflow therethrough of the content of the reservoir.
- said plug means also includes a substantially continuous sheath having an inside diameter of between about 0.025 and 0.250 inches, said sheath encasing and retaining the bundle of filaments and being tightly positioned in an opening to said reservoir.
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- Pens And Brushes (AREA)
Abstract
Description
Claims (7)
- 2. A plug according to claim 1 wherein said filamentous material is uncrimped and unbulked cellulose acetate.
- 3. A plug according to claim 2 wherein said filamentous material further includes a plurality of substantially continuous parallelly arranged polyester fibers positioned around the periphery of said cellulose acetate and adjacent said sheath.
- 4. A plug according to claim 2 wherein said filamentous material furtheR includes a plurality of substantially continuous parallelely arranged cotton threads intermixed with said cellulose acetate.
- 5. A plug according to claim 1 wherein said sheath between about 0.025 and 0.250 inches in diameter and is of a polypropylene construction.
- 6. A writing implement including in combination a fluid reservoir containing an ink supply, an applicator in contact with said ink supply and a back-end plug means comprised of a substantially parallelly arranged bundle of filamentous material having a total denier of between about 3,000 and 25,000, said means being further adapted to permit passage of atmospheric air while preventing backflow therethrough of the content of the reservoir.
- 7. A writing implement according to claim 3 wherein said plug means also includes a substantially continuous sheath having an inside diameter of between about 0.025 and 0.250 inches, said sheath encasing and retaining the bundle of filaments and being tightly positioned in an opening to said reservoir.
- 8. A writing implement according to claim 7 wherein said sheath is of a polypropylene construction.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00060318A US3822949A (en) | 1970-08-03 | 1970-08-03 | Ball point pen back end closure |
DE19712137296 DE2137296A1 (en) | 1970-08-03 | 1971-07-26 | Stopper as a closure for writing implements containing writing fluid, for example ballpoint pens |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00060318A US3822949A (en) | 1970-08-03 | 1970-08-03 | Ball point pen back end closure |
Publications (1)
Publication Number | Publication Date |
---|---|
US3822949A true US3822949A (en) | 1974-07-09 |
Family
ID=22028743
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00060318A Expired - Lifetime US3822949A (en) | 1970-08-03 | 1970-08-03 | Ball point pen back end closure |
Country Status (2)
Country | Link |
---|---|
US (1) | US3822949A (en) |
DE (1) | DE2137296A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4108559A (en) * | 1976-07-21 | 1978-08-22 | Dart Industries Inc. | Ball point pen back end closure |
US6028126A (en) * | 1996-07-25 | 2000-02-22 | Bic Corporation | Ink follower compositions |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102987664B (en) * | 2011-09-19 | 2014-09-24 | 翟飞恒 | Process for taking K gold jewelry from bottom water |
-
1970
- 1970-08-03 US US00060318A patent/US3822949A/en not_active Expired - Lifetime
-
1971
- 1971-07-26 DE DE19712137296 patent/DE2137296A1/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4108559A (en) * | 1976-07-21 | 1978-08-22 | Dart Industries Inc. | Ball point pen back end closure |
US6028126A (en) * | 1996-07-25 | 2000-02-22 | Bic Corporation | Ink follower compositions |
Also Published As
Publication number | Publication date |
---|---|
DE2137296A1 (en) | 1972-02-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: PLASTIC SPECIALTIES AND TECHNOLOGIES, INC., ROUTE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:DART INDUSTRIES, INC.;REEL/FRAME:004289/0470 Effective date: 19840427 Owner name: PLASTIC SPECIALTIES AND TECHNOLOGIES, INC.,ILLINOI Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:DART INDUSTRIES, INC.;REEL/FRAME:004289/0470 Effective date: 19840427 |
|
AS | Assignment |
Owner name: PLASTIC SPECIALTIES AND TECHNOLOGIES, INC., 119 CH Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PLASTIC SPECIALTIES AND TECHNOLOGIES, INC.,;REEL/FRAME:004854/0206 Effective date: 19870429 Owner name: PLASTIC SPECIALTIES AND TECHNOLOGIES HOLDINGS, INC Free format text: CHANGE OF NAME;ASSIGNOR:WILSON FIBERFIL HOLDINGS, INC.,;REEL/FRAME:004854/0211 Effective date: 19860317 Owner name: PLASTIC SPECIALTIES AND TECHNOLOGIES INVESTMENTS, Free format text: CHANGE OF NAME;ASSIGNOR:SPECIALTIES AND TECHNOLOGIES HOLDINGS, INC.;REEL/FRAME:004854/0217 Effective date: 19870331 Owner name: PLASTIC SPECIALTIES AND TECHNOLOGIES, INC., NEW JE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PLASTIC SPECIALTIES AND TECHNOLOGIES, INC.,;REEL/FRAME:004854/0206 Effective date: 19870429 |