Ink writing implement

Details Ink writing implement Ink writing implement

1998-05-18

2000-05-16

Walczak, David J.

Coating implements with material supply

Material flows through porous tool

Wick feed from within reservoir to tool

401227, 401209, B40K 500

Patent

active

060627581

DESCRIPTION:

BRIEF SUMMARY
The invention relates to an ink writing implement and, more specifically, to an ink delivery unit of an ink writing implement.
Such ink writing implements are generally known (for example DE-A-1 461 628, DD-A-0 151 561). The ink delivery units of the prior art include annular pressure-compensation chambers with capillary dimensions, and are manufactured using the injection-moulding method in a die mold including first and second mold halves, wherein stacks of sheet-metal plates comprising thin-walled sheet-metal laminates, which may be of a thickness of, for example 0.10 mm to 1.0 mm, are secured half. In addition, the stack of sheet-metal plates of one of the die mold halves is provided with an axially extending longitudinal sheet-metal plate which is provided in the circumferential region and by means of which the axially extending, capillary ink-feed channel is produced, for example in the form of a flat area (DE-A-3 429 031), in the molded element to be manufactured, and out of which longitudinal sheet-metal plate ink enters the annular pressure-compensation chamber during operation if an overpressure arises in the interior of the ink writing implement.
In order to form pressure-compensation chambers of essentially constant width which are continuous over their entire circumference by means of the die molded so that a large volume for holding excess ink is retained, it is necessary for the individual sheet-metal plates of the stacks of sheet-metal plates of the two molded halves to lie flush one on top of the other when the molded is closed and not to be offset axially with respect to one another. Only when there is flush alignment is a situation brought about in which an annular pressure-compensation chamber forms a continuous connection of essentially constant dimensions from one side of the ink-feed channel around the circumference of the molded, ink delivery unit to the other side of the ink-feed channel. However, such a flush alignment can only be obtained with a large degree of effort owing to the large number of extremely thin-walled sheet-metal plates of the stacks of sheet-metal plates. Normally, a certain axial offset is always produced, so that the respectively associated sheet-metal plates of the two mold halves are somewhat offset axially with respect to one another when the die mold is closed in the mould parting plane. As a result, a constriction or even interruption in annular pressure-compensation chambers, and thus a reduction in the chamber volume in the molded, ink delivery unit, occur in the region of the parting plane in the molded, ink delivery unit, at any rate the function is influenced.
It is also already known (WO 95/08798) to compose the molded, ink delivery unit of an ink writing implement from two separately manufactured units, the parting plane of the two units extending through the ink-feed channel, half of which is formed by one of the subelements and the other half of which is formed by the other subelement.
The object of the invention is to improve a writing implement to the effect that a situation is brought about in which, without appreciable production outlay, the annular pressure-compensation chambers of the molded, ink delivery unit are of a constant width over virtually their entire circumference.
In order to achieve this object, a writing implement is designed according to the invention in such a way that the molded, ink delivery unit has an axially extending flat area in order to form the ink-feed channel, and the mold parting plane passes through this flat area.
In a deviation from the known design of the molded, ink delivery unit of the writing implement, in the writing implement the mold parting plane is not offset by 90.degree. with respect to the radii through the center of the ink-feed channel but rather in the plane of such radii, the ink-feed channel being formed by a flat area of the molded, ink delivery unit. Forming the ink-feed channel by means of a flat area makes it possible to form radially inwardly protruding regions in the mold halves, which r

REFERENCES:
patent: 3411854 (1968-11-01), Rosler et al.
patent: 4556336 (1985-12-01), Sano et al.
patent: 4671692 (1987-06-01), Inaba

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