DE2034274A1 - Process for the production of a ballpoint pen or a ballpoint pen refill - Google Patents

Description

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11 147/43

■ Pirsia "G-eor-g Lins, 85 Jiürnberg, Silbers tr. 12

Process for the production of a ballpoint pen or a ballpoint pen.

In the German Of-fenlecjungssehrift 1 511 359 a writing tip for a ballpoint pen or a ballpoint pen refill is described, which ensures a constant 'transport' of the writing medium to the ball even when writing when the ballpoint pen is held with the tip upwards is, although the writing tip connected to the storage container has at its rear end a similar ventilation opening. The special design feature of this writing tip is that the channels (30g.

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each has a cross section of no more than 1000 / rev own. Lies represents a significant reduction in the cross section of the feed channels compared to the ballpoint pen tips known until then, in which the cross-section of the

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Feeding channels was more than 10,000 ./u.

109883/0982

The object of the present invention is now to provide a practical solution easy to carry out process for the production of such Writing tip to create;: .. The invention therefore relates to the individual a process for the production of a ballpoint pen or a ballpoint pen refill with a storage container for a preferably pasty writing medium and one connected to one end of the storage container, the lateral and Bottom-side spherical bearing seat for the ball-forming writing tip, with the storage container in the vicinity of his at the other end an opening and such a small internal cross-section comprises that when the ballpoint pen is held with its nib upward, the propellant due to the effective capillary forces in the writing tip the opening does not leak and in the storage area on the bottom (Base seat) channels open to the ball are provided,

which have a cross-section of at most 1000 / u and over which the writing medium from a central supply channel for the writing material the side bearing seat, preferably an annular collecting groove provided between the side and bottom seats.

The solution to the problem of the invention is that in the. known impressions of the ball in the Grundsits of Writing tip the upsetting pressure is chosen so large that the cross section of the feed channels in the upsetting zone is below 1000 / U narrowed. The procedure is preferably such that the base seat is compressed so much that the two

10988 3 / Ö9Ö2

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Touch the long sides of the ducts. The pressing of the ball into a pre-drilled writing tip is well known, so that it does not need to be discussed in detail. It should be pointed that against the later bottom bearing seat formed during the pressing the ball for the ball forming .Flächen to this, according to the material upsetting part-spherical formations that can i be regarded as left standing between the feed channels Islands. However, up to now Kan has never pushed the material compression of the base seat surfaces so far that a cross-section is created by narrowing the feed channels

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of at most 1000 / u and thus the effect showed that the writing medium is still transported to the ball while writing when the ballpoint pen is held with its tip upwards. Which upsetting pressure in the individual case when carrying out the 'according to the invention. The method used depends on the properties of the material from which the ballpoint pen tip or the bearing seat surfaces are made. With Kessing, for example, a much lower compression pressure will naturally be sufficient than if the writing tip is made of steel. The Sachraann can easily determine which compression pressure has to be applied in each individual case. For this it is only necessary that a few tests are carried out with different upsetting pressures and that the feed channel cross-sections obtained are enjoyed after the ball has been removed from the tip.

109883/0982

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When carrying out the method according to the invention only those areas of the feed channels narrowed to the desired cross-section, which lie in the compression zone. Those Zanal areas, however, which over'die compression zone bsv /. the partially spherical base areas formed in this protrude, thus retain their original measure, the essential can be above 1000 / U. The advantage of the invention is precisely that in the basic seat for the ball initially channels with a cross-section of considerably more than

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1000 / U can be introduced. The pushing in of food

channels with the usual cross-sections of more than 10 000 , u.

can be accomplished in a simple manner according to the previously known methods. The invention is referred to below under the heading the exemplary embodiment shown in the drawing described a writing tip produced by the method according to the invention. Show it:

Figure 1 shows a longitudinal section through the writing tip in greatly enlarged scale, whereby for clarification the formation of the feed channel ^ the location of the Ball is shown only in dashed lines;

Figure 2, a view in the seal of the arrow in Figure 1 and ■ FIG. 3 shows the writing tip without a ball in a diagrammatic view and on an even more enlarged scale, with Wall parts of the writing tip have broken out to clarify.

10988 3/0982 ~ "

. *, ^ BAD ORIGINAL

The nib, designated as 1 in total, can be obtained by machining a cylindrical blank, for example made of brass. The storage container (not shown) for the writing medium is attached to the end of the writing tip 1 facing away from the bearing seat for the ball. The connection between the reservoir and the space enclosed by the bearing seating surfaces 2, 3 for the ball 4 space is ^r by a central supply channel 5, provided 5 ", WO ·, on the immediately adjoining the base seat passage portion 5 'has a smaller cross-section has as the section 5 "adjoining the storage container. '

With 2 that area is that of the front face the nib introduced cavity referred to, after the Sinbördeln of the ball 4 the spherical lateral ball seat forms.

A shoulder 6 is formed in the writing tip, which " forms the transition from the lateral ball seat surface to the base seat surface for the ball. The latter is formed by individual part-spherical areas 3 between the front inserting the ball into the writing tip in the base seat inserted feed channels 8 lie. The partially spherical formation of the surfaces 3 results from this the compression pressure with which the ball is pressed against the base seat surface in the course of manufacturing the nib will. According to the invention, this is at the same time an essential

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109883/0982 BADOm, NAL

Narrowing of the feed channels 8 brought about in the Stauchaone. As can be seen from the drawing, the narrowing of the ^: feed channels has been guided so far that their longitudinal side walls touch one another in the compression zone; however, the contact does not exist over the entire height of the ducts, just as the / entire length of the feed ducts is not covered by the compression or narrowing (cf. Pigur 3). In the case of the ballpoint pens on the market today, which are designed according to Dili, the length of the feed channels is approx. 200 / rev with a ball diameter of 1 mm. The narrowed zone of the feed ducts only extends over a fraction of this.

After you have crimped the Ku / rel 4 there is between the side seat 2 and the Grundsiτc 3 an annular collecting groove 7 for the writing medium, which by the aforementioned shoulder β comes about in the frontal cavity of the writing tip 1.

The number of feed channels S is useful compared to the known writing tips increased. For example, it can be between ten and twenty.

The writing tip obtained by the method according to the invention is preferably used in ballpoint pens or ballpoint pen refills which have the DIx, I ^v iasse and a writing medium storage container, the inner cross section of which

109883/0982

is less than TO mn, and in which the storage container ^{is filled with a pasty writing medium with a viscosity at 37 °} C. of not less than 10 μi more than 250 poise.

37 ⁰ C of not less than 10 poise and preferably not

109883/0982

Claims (2)

Patent (protection) claims _L 1.) Process for the production of a ballpoint pen or a ballpoint pen refill with "a storage container for a preferably pasty writing medium and a writing tip which is connected to one end of the storage container and forms the lateral and bottom-side spherical bearing seat for the ball, the storage container in the - Near its other end has an opening and such a small inner cross-section that when the ballpoint pen is held with its nib upwards, the writing point due to the capillary forces acting in the nib does not leak through the opening and into the bottom bearing (base seat) to the ball open channels are provided, 2 which have a cross-section of at most 1000 / u and via which the writing medium from a central supply channel for the writing medium to the lateral bearing seat, preferably an annular groove provided between the side and bottom seats, flows, characterized by 'that at that, in itself known impressions of the ICu ^ eI in the base seat of the Writing tip the upsetting pressure is chosen so large that the cross-section of the feed channels in the upsetting zone narrowed to below 1000 / rev BAD ORiGiNAL 2. The method according to claim 1, characterized in that the base seat is compressed so much that the two long sides of the channels' touch. 109883/0982