EP0284851A1 - Exchangeable cartridge with writing point - Google Patents

Abstract

A cartridge with writing point (10) for liquid or viscous writing substances is used in writing instruments (14) which are, in particular, manual writing instruments. The cartridge has an essentially rod-shaped reservoir (11) for the writing substance and a writing point (12), it being possible for the cartridge (10) to be connected detachably to the writing instrument (14) via a thread (13) constructed on it. In order to be able to screw cartridges (10) of different lengths with writing substance reservoirs (11) of different sizes into one and the same writing instrument (14), the thread (13) is provided in the region of the end (16) of the cartridge (10) facing the writing point (12). <IMAGE>

Description

The invention relates to a writing lead for liquid or pasty writing materials for use in writing instruments, in particular in hand-writing instruments, which comprises an essentially rod-shaped writing medium container with a writing tip, the writing lead being releasably connectable to the writing instrument via a thread formed on it in such a way that the writing lead can be screwed into the writing instrument from behind.

A writing lead of this type is known (Lincoln type, AP Cross Company), in which the writing lead has a thread which is arranged at the rear end, ie directed towards the writing refill opening. This known writing lead is screwed into a suitably prepared writing instrument from behind, ie from the end of the writing instrument which is opposite the end of the writing instrument at which the writing tip protrudes when writing, and can if the writing lead is replaced by another writing lead by screwing in and unscrewing.

Basically, the provision of a thread on the writing lead for the releasable fastening of the writing lead in a writing instrument is a simple but very effective fastening means. A writing lead with a thread provided on it can only be used in a writing instrument that has a corresponding thread, i. H. Refill and writing instrument must be clearly coordinated with each other, in contrast to clamp connections, with which refills of different thicknesses and also different refill manufacturers can be used in a writing instrument. Compared to threaded fasteners, these are disproportionately expensive to manufacture.

In the known, threaded, refill, the refill consists of a writing medium container of relatively small cross section, i. that is, it is a writing lead with commercial dimensions, which is provided at its fill opening with a closure on which a thread is formed. Because of this known construction, the length of the writing lead, i. H. the distance from the thread to the writing tip must be precisely matched to the length of the writing instrument, since it must be ensured that the writing tip still protrudes from the writing instrument housing in a predetermined manner when the thread is screwed in.

Because of this type of attachment, writing leads with writing medium containers of different lengths and different sizes cannot be used with the writing instrument in question, since the length of the writing lead is always determined by the predetermined fixed distance between the writing tip and the thread of the writing lead.

It is an object of the present invention to provide a writing lead with different lengths, i.e. H. can also be used in writing utensils with different writing medium capacity, which only have the same or corresponding fastening thread, but can otherwise be of different lengths and which are simple to manufacture.

The object is achieved according to the invention in that the thread is provided in the region of the end of the writing lead facing the writing tip.

The advantage of this writing lead is essentially that the shape of the writing medium container of the writing lead, i. H. whose length, cross-sectional size and cross-sectional shape can be selected completely independently of one another and need not be matched directly to the writing instrument in which this writing lead can be used. For example, such a refill can be inserted into a writing device that is normally suitable for holding large-volume refills (so-called jumbo refills), even if the refill refill that can currently be obtained is a refill with a small cross-sectional diameter. It is also possible to insert a writing lead into a writing instrument in this way, which usually has a lot longer leads, but these longer writing leads are currently not available.

The advantage of the design of the writing lead according to the invention also lies in the fact that the distance between the writing tip of the writing lead and the thread is limited directly to the tip area of the writing lead, the cross-section of the writing lead tip area in all writing leads being generally reduced to a generally customary cross-sectional size, almost everyone commercial writing leads is the same within specified tolerance values.

In this respect, the provision of the thread in the region of the end of the writing lead facing the writing tip is not a volume restriction with respect to the writing medium container volume to be provided, in contrast to the known writing lead described above.

According to an advantageous refinement of the writing lead, the thread is provided on the end of the writing medium container facing the writing tip, as a result of which separate measures for attaching the thread to the writing lead are dispensed with and a very cost-effective embodiment is thus created.

According to a further advantageous embodiment of the writing lead, the thread is provided on a spacer body arranged between the writing medium container and the writing tip. This location of attaching the thread is advantageous if, for example, austenitic steels are used to manufacture the writing medium container and the writing tip, which do not allow a cross-sectional taper directly towards the writing tip, since the austenitic steel cannot be deformed without complex treatment methods. In such writing leads, a spacer is used in the area of the cross-section reduction towards the writing tip. This spacer is advantageously suitable for attaching the thread.

The thread of the writing lead is preferably formed on a section of the spacer body which has a diameter of less than / equal to the largest cross-sectional dimension of the writing medium container. This type of execution of the writing lead allows any size Cross-section of writing medium, since the thread is formed in a section on the spacer which is always the same even with different cross-sectional diameters of the writing medium container.

In order to minimize the manufacturing costs of the writing leads, the spacer body on which the thread is formed is preferably made of plastic. In principle, however, the spacer body can also consist of a metallic material.

In order to protect the writing refill from the ingress of atmospheric oxygen during non-use and for transport, a screw cap with an appropriate thread that envelops the writing tip can be screwed onto the thread of the writing refill. This protective cap, which can either be made of plastic or a metallic material, can also be used as a protective cap for a writing lead that was unscrewed from a writing instrument because, for example, a writing lead with a different color was inserted there, and which was then used for the interim storage is closed.

The invention will now be described in detail with reference to the following schematic drawings using an exemplary embodiment.

• Fig. 1 eine Schreibmine in vergrößertem Maßstab in der Seitenansicht,
• Fig. 2 eine Spitze eines Schreibgerätes in geschnit­tener Darstellung, in die die Schreibmine eingeschraubt werden kann,
• Fig. 3 im Ausschnitt den Bereich des der Schreib­spitze zugewandten Endes der Schreibmine mit Gewinde, das in die in Fig. 2 dargestellte Schreibgerätespitze eingeschraubt werden kann und
• Fig. 4 eine Schutzkappe zum Aufschrauben auf das Gewinde der Schreibmine in der Seitenansicht.

In it show:

• 1 is a side view of a writing lead on an enlarged scale,
• 2 shows a tip of a writing instrument in a sectional view, into which the writing lead can be screwed,
• 3 shows a section of the area of the end of the writing lead with thread facing the writing tip, which can be screwed into the writing instrument tip shown in FIG. 2, and
• Fig. 4 shows a protective cap for screwing onto the thread of the writing lead in a side view.

The writing lead 10 essentially consists of a cylindrical writing medium container 11, which as a rule has a circular cross section, in which liquid or pasty writing medium is received in a known manner. The writing medium container 11 has an end facing the writing tip 12 and an end 17 facing the filling opening (not shown separately). The filling opening is closed in a known manner, which is likewise not shown separately here.

The end 16 of the writing medium container 11 facing the writing tip 12 is provided, according to the exemplary embodiments shown in the figures, with a spacer body 18, which projects into the writing medium container 11 with a spacer body section 20 and is generally fitted there in a press fit. The spacer body section 19 protruding from the writing medium container 11 has a thread 13 in the form of an external thread, which can be screwed into a corresponding thread 15 of a writing instrument 14, which is shown in FIG. 2 in the form of a front part of the writing instrument. The thread 15 in the writing instrument 14 is accordingly an internal thread.

For clarification, it should be emphasized that the exemplary embodiment of the writing lead shown in the figures shows the attachment of the thread 13 directly on the spacer body 18, but it is also conceivable that Thread 13 at the appropriate distance from the writing tip can also be provided directly on a writing medium container 11 with a corresponding diameter.

1 and 4, a cap 21, which has an internal thread corresponding to the thread 13, can also be provided and placed and screwed onto the thread 13 of the writing lead 10 in accordance with the dash-dotted line. This cap 21 can be used for transport, storage but also to protect the user from contamination by the writing medium, for example if the writing lead 10 is meanwhile unscrewed from the writing instrument 14 and is put back there at a later time.

The writing lead 10, the writing tip 12, which is generally also cylindrical and has a circular cross section, and also the spacer body 18 can in principle be made of the same materials, for example metallic materials. However, it is also conceivable to form at least the spacer body 18 from a different material, for example plastic, than the material of the writing lead 10 and that of the writing medium container 11. The cap 21 can also consist of metallic material or plastic, for example.

The length of the writing medium container 11 is freely selectable within wide limits in the writing refill 10 proposed here, that is, it is only a matter of maintaining the distance between the thread 13 and the writing end 22 of the writing tip, which is to achieve a predetermined amount from the Outstanding amount of the writing instrument must be observed.

Reference symbol list

• 10 writing leads
• 11 writing material containers
• 12 writing tip
• 13 threads
• 14 writing instrument
• 15 threads
• 16 end (writing tip)
• 17 end (filling opening)
• 18 spacers
• 19 spacer section
• 20 spacer section
• 21 cap
• 22 Writer of the writing tip

Claims (6)

1. Writing refill for liquid or pasty writing materials for use in writing instruments, in particular in hand writing instruments, which comprises an essentially rod-shaped writing medium container with a writing tip, the writing refill being releasably connectable to the writing instrument via a thread formed on it so that the writing refill can be seen from behind Can be screwed into the writing instrument, characterized in that the thread (13) is provided in the region of the end (16) of the writing lead (10) facing the writing tip (12). 2. Writing refill according to claim 1, characterized in that the thread (13) on the writing tip (12) facing end (16) of the writing medium container (11) is provided. 3. Writing refill according to claim 1, characterized in that the thread (13) is provided on a spacer body (18) arranged between the writing medium container (11) and the writing tip (12). 4. Writing refill according to claim 3, characterized in that the thread (15) on a section (19) of the spacer body (18), which has a diameter of less than / equal to the largest cross-sectional dimension of the writing medium container (11), is formed. 5. refill according to one or both of claims 3 or 4, characterized in that the spacer body (18) consists of plastic. 6. refill according to one or more of claims 1 to 5, characterized in that on the thread (13) provided with a corresponding thread, the writing tip (12) enveloping cap (21) can be screwed on.

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