GB723425A - Improvements in and relating to ball tip writing instruments - Google Patents

Improvements in and relating to ball tip writing instruments

Info

Publication number
GB723425A
GB723425A GB2022351A GB2022351A GB723425A GB 723425 A GB723425 A GB 723425A GB 2022351 A GB2022351 A GB 2022351A GB 2022351 A GB2022351 A GB 2022351A GB 723425 A GB723425 A GB 723425A
Authority
GB
United Kingdom
Prior art keywords
reservoir
liquid
ink
plug
gas
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
Application number
GB2022351A
Inventor
Hans Reinhard Fehling
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BIRO SWAN Ltd
Original Assignee
BIRO SWAN Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BIRO SWAN Ltd filed Critical BIRO SWAN Ltd
Priority to GB2022351A priority Critical patent/GB723425A/en
Publication of GB723425A publication Critical patent/GB723425A/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B43WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43KIMPLEMENTS FOR WRITING OR DRAWING
    • B43K7/00Ball-point pens
    • B43K7/02Ink reservoirs; Ink cartridges

Landscapes

  • Pens And Brushes (AREA)

Abstract

723,425. Reservoir pens. BIRO SWAN, Ltd., [formerly BIRO PENS, Ltd.]. Aug. 26, 1952 [Aug. 28, 1951], No. 20223/51. Class 146 (3). The ink reservoir of a ball-point pen is initially closed, and to prevent the pressure above the ink meniscus falling substantially below atmospheric during the early part of the writing life of the reservoir, a gas-emissive medium is introduced into the reservoir above the ink meniscus. As shown in Fig. 1, a capillary tube reservoir 1 having a writing extremity 2 at one end and a closure plug 6 at the other, has the vent hole 8 in the plug 6 closed by a removable or frangible disc 9, and between the plug and the ink meniscus 5 there is a tube 10 having a small capillary bore in which there is a liquid 12. The liquid 12 has a boiling point between 20 and 35‹C. and may comprise trichlorofluoromethane, methylformate, or 1-4 pentadiene, and is such that gas will be emitted to maintain the pressure in the space above the ink meniscus 5 substantially at atmospheric pressure while some of the ink 4 is used up in the act of writing. The liquid 12 also may comprise carbon dioxide dissolved in water or some hydrocarbon oil. When the pen ceases to function, the disc 9 is pierced or removed so that air can enter the reservoir, and the pen will function in the normal manner. In a modification, the liquid 12 is in the vent 8, and the tube 10 dispensed with. The gasemissive liquid could be used in reservoirs of non- capillary size, where a piston or viscous plug rests on and follows the ink meniscus down the reservoir tube. In the form shown in Fig. 5, the gas-emissive liquid is held by a porous plug or sponge 15 which may be vented at 16 to facilitate entry of air when the disc 9a is pierced or torn off. In all cases the gas pressure should not be so high as to cause ink to seep from the gap between the ball and its housing. Specifications 573,747, 629,226, 652,359, 688,891, .695,621 and 695,861 are referred to.
GB2022351A 1952-08-26 1952-08-26 Improvements in and relating to ball tip writing instruments Expired GB723425A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2022351A GB723425A (en) 1952-08-26 1952-08-26 Improvements in and relating to ball tip writing instruments

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2022351A GB723425A (en) 1952-08-26 1952-08-26 Improvements in and relating to ball tip writing instruments

Publications (1)

Publication Number Publication Date
GB723425A true GB723425A (en) 1955-02-09

Family

ID=10142427

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2022351A Expired GB723425A (en) 1952-08-26 1952-08-26 Improvements in and relating to ball tip writing instruments

Country Status (1)

Country Link
GB (1) GB723425A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3000354A (en) * 1958-02-04 1961-09-19 Doleo S A Refill of a ball point writing means

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3000354A (en) * 1958-02-04 1961-09-19 Doleo S A Refill of a ball point writing means

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