DE2706951A1 - WRITING DEVICE WITH A MINE MOVABLE FORWARD AND RETURNING MEANS - Google Patents

Description

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Patent and utility model auxiliary application

the

Company KREUZE «-UEfiK GMBH, Bonner Str. 132, Bonn-Duisdorf

concerning

Writing implement with a lead that can be moved back and forth by means of a switching mechanism

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description

The invention relates to writing implements, in particular fiber pens or felt-tip pens, with a hollow front end open shaft, in whose axial bore a mine by means of a switching mechanism between a rear rest position, in which the lead tip is located behind the front end within the shaft, and a front use position in which the lead tip is the front end of the Shank protrudes forward, is movably arranged.

In writing implements of this type, especially when in use of fiber or felt leads, there is a risk that these leads will be released relatively quickly due to the withdrawal of the writing fluid dry out the solvent contained. This danger exists to a particularly great extent during storage of the writing instrument, which can take several months under certain circumstances. The writing tip dries out since the remaining parts of the mine are generally made of materials impermeable to water or solvent vapor exist. In addition, it is also sufficient if only the order peak and the subsequent area are dried out, because then usually the mine is not melu to the Writing can be brought in even if there is still a certain amount of writing fluid in the refill's reservoir should be present.

In order to prevent the leads of a writing instrument from drying out in this way, attempts have already been made to use the front exit end of the shaft by means of a membrane-like closure

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to seal members, wherein the lead tip penetrates the closure member and is exposed when the lead is advanced. However, such an approach has a number of disadvantages. For one, it's practically impossible to do with a reasonable amount of effort to design such a closure member in such a way that a reliable seal is ensured. For another, prepares the attachment of membrane-like closure members considerable effort. Ultimately, however, it has also been flawless Formation of the membrane-like closure members showed that the mines nevertheless, albeit possibly a little slower, drying out, which is probably due to the fact that the solvent or the moisture can leave the shaft not only at the front end but also in other sections.

The invention is therefore based on the object of designing a writing implement of the generic type in such a way that it dries out the mine is reliably prevented at least during the storage period. It is in the invention of the Consideration assumed that the inks used in particular in fiber or felt-tip pen leads generally last as long can be stored openly, as is the case for normal writing use is required, so that prevention of drying out during the storage time alone is sufficient.

To solve this problem it is proposed according to the invention in the generic writing implement that in the Axial bore of the shaft in an area behind the mine tip, which is in the rest position, a gap between Shaft wall and mine closing seal arranged and the front exit end of the axial bore through a by means of the tip of the lead as it moves forward,

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ble sealing plug is closed.

In the case of the writing instrument according to the invention, the seal and the sealing plug and the corresponding shaft section the lead tip during storage, i.e. for as long the lead tip has not yet been moved forward, reliably sealed, with the seal also allowing an escape of moisture or solvents to the rear. Once the writing instrument is sold and used is to be, the mine must then be moved forward for the first time by means of the switching mechanism, whereby the sealing plug ejected and the writing instrument is ready for use. In this way it is achieved that the writing instrument can be stored for practically an unlimited period of time. On the other hand, there is no drying out during the normal period of use to be feared, since the inks now commonly used have an open storage time of about 6 months. During this time, however, the normal writing length of the lead is usually exhausted.

In order to be able to leave the seal in the writing instrument during the entire service life of the writing instrument it is favorable if the seal is made by a the mine is formed resiliently abutting sealing collar, the sealing collar expediently at least has a sealing lip resting against the mine. When using such an elastic sealing cuff, despite the If this sealing collar is present, the mine can be moved back and forth without difficulty.

This movement is further facilitated by the fact that the mine is in the rest position at least in the one with the sealing collar when moving between this and the use position in contact area a cylindrical Has lateral surface.

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The assembly of the seal is simple if according to the invention the shaft of the writing instrument in the area of the seal into a shaft rear part, which has the switching mechanism, and a shaft front part which can be fixed to this and which has the outlet end is divided, and if further the seal eiue has between corresponding shoulders of the front part and rear part fixable, radially outwardly projecting annular rib. This training also has the advantage that the shaft front part and rear part can be made of different materials.

With the aforementioned subdivision of the shaft into a front and rear part, it is advantageous if the shaft rear part is at the front has an internal thread adjoining an internal shoulder, into which the front part of the shaft is threaded by means of a rear thread End edge adjoining external thread can be screwed. In this way, the assembly of the seal in the shaft and the Connection of the shaft ends facilitated and at the same time a reliable fixing is achieved.

The sealing plug and the axial bore of the shaft are preferably essentially cylindrical in the region of the outlet end formed, whereby the attachment of the sealing plug and its ejection are facilitated.

It has also been found to be useful if the Sealing plug made of elastically deformable material and clamping in the outlet end of the by means of a circumferential bead Axial bore is set, since then no overly large, in particular no damage to eject the sealing plug the leading force of the lead tip is required, but nevertheless a reliable seal of the outlet end of the Axial drilling of the shaft is achieved.

A particularly long shelf life is achieved according to the invention then if the seal, the sealing plug and at least

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the shaft section in front of the seal is made of a water or Solvent-vapor-impermeable material exist or are coated with such a material, the coating must of course be done in a continuous position. The seal and / or the sealing plug are expedient consist of polypropylene or polyethylene or have a continuous layer thereof. The one before the seal lying shaft section is preferably made of polypropylene, polyethylene, polyvinyl chloride or metal or has a continuous layer of one of these materials.

Further features, details and advantages of the invention emerge from the following description of a preferred one Embodiment based on the drawing, in which the Voruerende a writing instrument according to the invention in axial section is shown.

The writing instrument shown in the drawing has a shaft 1, which consists of a rear part 2 and a shaft front part 3 exists. The rear part of the shaft 2 has an internal thread at its front end, adjoining an internal shoulder 4 5 on. This internal thread 5 is used to determine the Shank front part 3 by means of an external thread 7 provided on this and adjoining the rear end edge 6

The shaft 1 has an axial bore 8 extending through the rear part 2 into the front part. This axial bore

8 is used to accommodate the mine 9 »which by means of a not shown * Switching mechanism between the rear rest position shown in the drawing and a front use position can be moved, in which the lead tip 10 via the front end 11 of the shaft front part 3 protrudes. The mine

9 is in a manner known per se by the return spring 12, on the one hand an annular shoulder 13 of the mine 9 and on the other hand an annular shoulder 14 of the shaft front part 3 rests, pressed into the rear rest position according to the drawing.

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From the drawing it can also be clearly seen that the approximately cylindrical area 15 of mine 9 »in which it is is generally the ink container, a sealing collar 16 by means of two sealing lips 17 rests outside. The sealing collar 16 consists of elastic material impermeable to water vapor or solvent vapor, for example made of polyethylene or polypropylene. The sealing collar 16 is on the shaft 1 in the area of the axial bore 8 set by means of an annular rib 18 which protrudes radially outward from the sealing collar 16 and between the inner shoulder 4 of the rear shaft part 2 and the rear end edge 6 of the front shaft part 3 after screwing in of the front part 3 is clamped in the internal thread 5 of the rear part 2 of the shaft 1.

Since the sealing collar 16 is made of elastic material and the mine 9 in the area 15 is essentially cylindrical is formed, the mine 9 can easily in the axial direction of the despite the presence of the sealing collar 16 Shank 1 are moved.

The outlet end 19 of the axial bore 8 at the front end 11 of the shaft 1 is, as the drawing shows, approximately cylindrical educated. This exit end 19 of the axial bore 8 of the shaft 1 is closed by a sealing plug 20, the also consists of elastically deformable material, which is accordingly impermeable to water vapor or solvent vapor is. The plug 20 can also be made of polyethylene or polypropylene, for example. He's in a tight spot set in the outlet end 19 of the axial bore 8. For this purpose, the sealing plug 20 has a circumferential bead 21, which rests accordingly on the inner shaft wall. If necessary, the shaft could be in the area the outlet end can even be provided with an annular groove 22 for receiving the circumferential bead 21.

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In the embodiment shown, the sealing plug closes 20 with its front edge 23 flush with the front end 11 of the shaft 1 or shaft front part 3. Of course but the sealing plug 20 could also be used in another Ueise be trained.

In order to seal the space between the sealing sleeve 16 and the sealing plug 20 tightly, i.e. an escape of To reliably prevent water vapor or solvent vapor, the shaft front part 3 must of course also be made from a corresponding Material. In particular, as in the exemplary embodiment shown, it can be produced from a metal be. Other materials would be for example polypropylene, Polyethylene or polyvinyl chloride. After the shaft 1 is divided in the area of the sealing collar 16 anyway is, it is understandably not difficult to make the shaft front part 3 from a suitable material to manufacture.

In this context it should also be mentioned that of course not the entire sealing collar 16, the entire sealing plug and the front part 3 as a whole made of correspondingly water or Solvent vapor impermeable materials must exist. If necessary, a corresponding Sufficient layer.

When a writing instrument is formed according to the invention between the sealing collar 16 and the sealing plug 20 a room 24 in which the mine tip 10, which is normally exposed to the risk of dehydration, is accommodated. This space 24 is hermetically sealed, however, so that neither water vapor nor solvent vapor escape to the outside and thus the lead tip 10 or the entire lead 9 cannot dry out. This room 24 remains as long hermetically sealed than the sealing plug

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located in the outlet end 19 of the shaft front part 5 or the axial bore ü.

As soon as the writing instrument is to be used, the refill 9 is moved forwards in the filing direction 2 ^ by appropriate actuation of the switching mechanism, whereby the refill tip 10 engages in the recess 26 on the sealing plug 2Ü and with a corresponding further forward movement of the refill 9 the sealing plug 20 is ejected from the outlet end 19 of the shaft 1. The writing instrument is now ready for use. During the usual service life of usually less than 6 months, there is no need to fear that the lead 9 or lead tip 10 will dry out.

From the drawing it can finally be seen that the shape of the recess 26 of the sealing plug 20 is dex · shape of the Mine tip 10 is adapted. This is especially useful for relatively soft lead tips, such as those in Fiber or felt pens are present, achieves that despite the exerted on the sealing plug 20 by the lead tip 10 Force the lead tip 10 is not deformed or damaged.

Finally, it should be noted that in the above Description, although it was assumed that the sealing collar 16 and the sealing plug 20 are made of elastic produce deformable material. Of course, an embodiment would also be conceivable in which in particular the sealing plug 20 consists of a different material. The sealing plug 20 could, for example, from a means of Lead tip tearable or breakable material, for example a thin membrane, made of wax or the like. manufactured be.

Claims (12)

Patent (protection) claims 1.) Writing implement with a hollow shaft, open at the front end, with a lead in its axial bore by means of a switching mechanism between a rear Rest position, in which the lead tip is behind the front end within the shaft, and a front use position in which the lead tip moves the front end of the shaft forward protrudes above, is movably arranged, characterized in that in the axial bore (8) of the shaft (1) in an area behind the mine tip (10), which is in the rest position, a gap between Shaft wall and mine (9) sealing seal (16) arranged and the front exit end (19) the axial bore through a sealing plug that can be ejected by means of the lead tip as it moves forward (20) is closed. 2. Writing implement according to claim 1, characterized in that the seal is fixed by a on the shaft (1), the mine (9) resiliently abutting sealing collar (16) is formed. 3. Writing implement according to claim 1 and 2, characterized in that the sealing collar (16) at least has one of the mine (9) abutting sealing lip (17). 809834/0123 ORIGINAL INSPECTED 4. Writing implement according to claim 2 or 3j, characterized in that that the mine (9) at least in the one with the sealing collar (16) in the rest position and during movement a cylindrical outer surface between this area and the area in contact with the position of use (15). 5. Writing implement according to one of the preceding claims, characterized in that the shaft (1) in the area the seal (16) in a shaft rear part (2), which has the switching mechanism, and one on this fixable, the outlet end (19) having the shaft front part (3) is divided, and that the A seal that can be fixed between corresponding shoulders (4-, 6) of the front part and the rear part, radially has outwardly protruding annular rib (18). 6. Writing implement according to claim 5 »characterized in that that the rear part of the shaft (2) has an internal thread (5) connected to an internal shoulder (4) at the front, into which the shaft front part (3) by means of an external thread (7) adjoining its rear end edge (6) can be screwed in. 7- writing implement according to one of the preceding claims, characterized in that the sealing plug (20) and the axial bore (8) of the shaft (1) in the area of the The outlet end (19) are essentially cylindrical. 8. Writing implement according to one of the preceding claims, characterized in that the sealing plug (20) from elastically deformable material and by means of a circumferential bead (21) clamping in the outlet end (19) 809834/0123 the axial bore (8) is fixed. 9. Writing implement according to one of the preceding claims, characterized in that the sealing plug (20) has one of these on the side facing the lead tip (10) adapted and it has recess (26) receiving it when the mine (9) moves forward. Writing implement according to one of the preceding claims, characterized in that the seal (16), the Sealing plug (20) and at least the shaft section (3) in front of the seal made of a water- or solvent-vapor-permeable Consist of material or are coated with such a material. 11. Writing implement according to claim 10, characterized in that the seal (26) and / or the sealing plug (20) consist of polypropylene or polyethylene or have a continuous layer thereof. 12. Writing implement according to claim 10 or 11, characterized in that that the shaft section (3) in front of the seal is made of polypropylene, polyethylene, polyvinyl chloride or metal or has a continuous layer of one of these materials. 809834/0123