Patent GB-870803-A (GB)
Title: An arrangement in fountain pens for producing strokes of even width
IPC: B43K5/18
Filed: 1958-08-01
Abstract: 870,803. Reservoir pens. RODENHAUSER, E. Aug. 1, 1958 (Aug. 3, 1957], No. 24832/58. Class 146(3). In an assembly of nib, nib section and feedbar for a fountain pen the feed-bar is divided into a lower part and an upper part and has a plurality of compensating pockets which are interconnected by return channels and an annular channel and of which pockets at least one is arranged above and one below the ink feed ducts as well as in the upper and lower part of the divided feed-bar, each pocket being provided with a plurality of capillary cells. The upper part 2a of the feedbar has overflow pockets 5, 6 each comprising a plurality of capillary cells 9, on its inclined upper faces, the capillary cells 9 in each pocket being-connected by a longitudinal capillary groove 13. An overflow pocket 7 is formed on the lower face of the part 2a having further capillary cells 9 also connected by a capillary groove 13. The pockets 5, 6 communicate with the pocket 7 through radial holes 12 which connect the grooves 13. The lower part 2b of the feed-bar has shoulders 17 on its upper surface between which the part 2a is a friction fit; locating pins 18 are formed on the upper part to provide additional anchorage between the two parts. An overflow pocket 8 on the underside of the lower part 2b comprises further cells 9 connected by a longitudinal capillary groove 13, some of the cells 9 in. this pocket merging into ink intercepting grooves 16 formed in the part 2b of the feed-bar adjacent to the nib: Ink ducts 11 are formed in the lower part 2b and extend from a position underneath the nib 1, beneath the overflow pocket 7 to the rear end of the part 2b which is spigotted at 15 for insertion into a sleeve 21 at the mouth of the reservoir 4. The spigot 15 has an annular groove 29 with which the ink ducts 11 communicate and which is connected with the longitudinal capillary channels 13 by return channels 34. An air duct 10 runs along the top of the feed- .bar from a position beneath a hole 20 in the nib 1 to the rear end and communicates with the reservoir 4 through a passage 22 in the sleeve 21. A channel 36 extends from the front end of the feed-bar part 2b and communicates with the cells 9 of the pockets 5, 6 which are nearest to the nib for venting purposes. The nib 1 is angled as shown in Fig. 3 so as to be non-flexible. The nib and feed-bar assembly are encased in a hood 3 secured to the barrel, the joint being sealed by a spacing ring 31; of elastic material. In use an excess of ink fed along the ducts 11 is trapped in the pocket 7 and may be transferred to the pockets 5 and 6 through the holes 12. An excess of ink reaching the nib is intercepted by the grooves 16 and transferred from there into the overflow pocket 8. Ink in the pockets 5-8 is fed back through the return channels 34 to the annular groove 29 from which it is fed to the nib along the ducts 11. Air is supplied to the reservoir through the duct 10 which has no communication with the ducts 11 and through which ink is sucked in the action of filling the pen. In modifications the cells 9 in the pocket 8 may be arranged obliquely andthe air duct 10 may be in the form of a bore in the lower feed-bar part 2b, or all the capillary cells 9 may be disposed parallel to the axis of the feed-bar and the duct 10 may be in two parts, one part passing along each side of the feed-bar. In a further embodiment the duct 10 may be in the form ofa capillary tube positioned between the two parts of the feed-bar.