DD145083A1 - CASE WEIGHT FOR PENCIL PEN - Google Patents

Abstract

The invention relates to a drop weight for ink writing or writing instruments. A capillary system on its surface is designed so that a continuous capillary connection from the ink supply is secured to the writing tube and thus always trouble-free letter is guaranteed. The use of wettable plastics is possible because this component is not exposed to mechanical stress.

Description

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a) Title of the invention Case weight for tube recorder B 43 K 8/00

b) Field of application of the invention

Writing and drawing instruments with a pen tip

c) Characteristic of the known technical solution

The usual drop weights for tube writers are cylindrical in shape with a lateral flattening at the end to which the cleaning wire is attached. These drop weights, like the plungers, are made of plastics which are generally poorly wettable by the writing fluid. For this reason, difficulties arise in the cover letter of the tube writers (cover letter only after repeated shaking). Rewriting the vial pen becomes impossible when the vial is held up and the ink flowing back sucked in air. In this case, the invaded air on G ^r and the poor wettability of the plastic material prevents the ink from flowing into the gap to the writing tube.

A technical solution described in German Laid-Open Application No. 22 35 880 represents an attempt to eliminate the above-cited labeling of the letter. Here, the broken connection to the writing tube by in the frustoconical region de3 drawing cone incorporated, inwardly directed ribs, which form between capillary grooves to be restored * Due to the above-described poor wetting is rewrite by penetrated in this construction

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Air is prevented when the tube is held up. The capillary effect does not come about because of the lack of wetting.

Another technical solution is described in DT-OS 23 26 431. It represents a continuation of the solution described above. Here, the torn connection between the ink reservoir and writing tube is to be restored by Längskapillaren that are incorporated into the inner wall of the character cone. These capillaries are also ineffective if the plastic material of the drawing cone with the ink does not reach a certain wetting value.

d) Object of the invention

The aim of the invention is a Rohrchenschreibererspitze, in which a good write-on behavior is ensured even with poorly wettable plastic material of the character cone.

e) Presentation of the essence of the invention

The pipette tip of the invention has a drop weight with a system of longitudinal capillary grooves on the lateral surface. This drop weight is not subject to mechanical stress and can therefore be made of a material which only has to fulfill the condition of optimum wetting with the ink. The capillary system on the drop weight is designed so that a continuous capillary connection is secured from the ink supply to the writing tube.

f) embodiment

A longitudinal section through a Rohrchenschreibererspitze invention is shown in Figure 1. The drop weight 1 consists of a cylindrical body with a conical tip into which the cleaning wire 2 is inserted. On the surface of the falling weight 1 are Kapillarrillen 5 (see Figure 2: cross section through the

Drop weight ί), which are mounted on the cylindrical part parallel to the longitudinal axis and on the apex of the cone. When using a wetting plastic material, these capillaries always fill themselves.

If the drawing device refilled (attaching a cartridge or a filled ink container) and placed in writing position, the ink passes through the Kapillarrillen 5 to the beginning of the writing tube 4, regardless of whether air in the gap between case weight 1 and the normally poorly wetting inner wall of the Character cone 3 is located. From the system of Kapillarrillen 5, the ink enters the immediately adjacent capillary gap between writing tube 4 and cleaning wire 2 a. Thus the ink-drawing device is ready to write. A shaking of the drawing device to speed up the letter is unnecessary.

Claims (2)

invention claims 1, case weight for tube writers of cylindrical shape with cleaning wire on the conical tip such that the cylinder and conical surface have been designed into a system of longitudinal capillary grooves. 2. Falling weight according to item 1, such that a wettable plastic is used to increase the capillary action.