GB721433A - Improvements in and relating to reservoir writing instruments - Google Patents

Improvements in and relating to reservoir writing instruments

Info

Publication number
GB721433A
GB721433A GB24336/50A GB2433650A GB721433A GB 721433 A GB721433 A GB 721433A GB 24336/50 A GB24336/50 A GB 24336/50A GB 2433650 A GB2433650 A GB 2433650A GB 721433 A GB721433 A GB 721433A
Authority
GB
United Kingdom
Prior art keywords
belly
ball
capillary
air inlet
inlet
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
GB24336/50A
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 PENS Ltd
Original Assignee
BIRO PENS 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
Priority claimed from GB13210/50A external-priority patent/GB651509A/en
Application filed by BIRO PENS Ltd filed Critical BIRO PENS Ltd
Publication of GB721433A publication Critical patent/GB721433A/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

721,433. Reservoir pens. BIRO PENS, Ltd. Oct. 1, 1951 [Oct. 5, 1950], No. 24336/50. Class 146 (3). In a ball-point pen the reservoir 1 has a belly 2 which is non-capillary, a capillary ink channel 5a leading to the ball housing 3 from the outlet 6 of the belly, and a capillary air inlet 7 leading to the belly, this inlet being directed towards the ball 4 and vented at 8 nearer to the ball than its junction with the belly, and having a volume sufficiently large e.g. 10 per cent. of that of the belly, to prevent ink running out of the vent 8 under the combined effects of gravity and expansion of the air and ink in the belly due to normal changes of temperature and atmospheric pressure. The relationship between the volumes of the belly and air inlet is in accordance with a formula set out in the Specification. In a modification, the air inlet is a duct which protrudes into the belly. To facilitate manufacture from synthetic resin by an injection moulding process using a core for the belly and two protruding rods for the duct 5a and inlet 7, the end of the belly 2 is initially open, but is subsequently closed by a plug, &c. 10. If the belly 2 is not of circular cross-section, the smallest dimension in cross-section should not be less than 3 or 3.5 m.m. Specifications 571,698, 573,747, 609,817, 651,481 and 651,509 are referred to.
GB24336/50A 1948-01-26 1950-10-05 Improvements in and relating to reservoir writing instruments Expired GB721433A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB13210/50A GB651509A (en) 1948-01-26 1948-01-26 Improvements in and relating to reservoir writing instruments

Publications (1)

Publication Number Publication Date
GB721433A true GB721433A (en) 1955-01-05

Family

ID=10018836

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24336/50A Expired GB721433A (en) 1948-01-26 1950-10-05 Improvements in and relating to reservoir writing instruments

Country Status (4)

Country Link
BE (1) BE486886A (en)
CH (2) CH275469A (en)
FR (2) FR1040556A (en)
GB (1) GB721433A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE495545A (en) * 1949-05-12

Also Published As

Publication number Publication date
CH299219A (en) 1954-05-31
FR1040556A (en) 1953-10-16
BE486886A (en)
FR62133E (en) 1955-06-10
CH275469A (en) 1951-05-31

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