GB721433A - Improvements in and relating to reservoir writing instruments - Google Patents
Improvements in and relating to reservoir writing instrumentsInfo
- 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
Links
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
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.
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)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE495545A (en) * | 1949-05-12 |
-
0
- BE BE486886D patent/BE486886A/xx unknown
-
1949
- 1949-01-14 FR FR1040556D patent/FR1040556A/en not_active Expired
- 1949-01-17 CH CH275469D patent/CH275469A/en unknown
-
1950
- 1950-10-05 GB GB24336/50A patent/GB721433A/en not_active Expired
-
1951
- 1951-10-03 CH CH299219D patent/CH299219A/en unknown
- 1951-10-05 FR FR62133D patent/FR62133E/en not_active Expired
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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