EP3370975B1 - Pencil - Google Patents

Description

The invention relates to a pin, comprising a lead and a sheathing element that at least partially encases it.

Pens, which include leads and a sheathing element which at least partially encases them, are known. The casing of the mine with a corresponding casing element can be expedient from various aspects; for example, a sheathing element of a less dimensionally stable or very soft lead, as u. a. used in cosmetic pencils, give a certain shape stability.

To date, corresponding sheathing elements made of comparatively stable materials, such as. B. made of wood or wood substitutes. To sharpen the pen or the coated lead of the pen, corresponding sharpening devices with mechanically comparatively stable pointed elements are required. Typically, sharpening devices with pointed elements made of hardened steel with a hardness above 60 HRC (Rockwell hardness) are used for sharpening corresponding pencils.

Due to the sharpening properties of corresponding pens or leads, which make the use of mechanically sufficiently stable, d. H. In particular, require hard, pointed elements, the production of corresponding sharpener devices is comparatively complex or cost-intensive from the point of view of production technology or economics.

DE 2937441 discloses a pen with a sheath formed from a material that can be processed in a casting process.

DE 10 2008 034 013 A1 discloses a wood replacement material for wood-cased pencils.

The invention has for its object to provide a pen with improved sharpening properties.

The object is achieved by a pen according to claim 1. The dependent claims relate to different embodiments of the pen.

The pen described here can in principle be any type of pen which has a correspondingly coated lead. By way of example only, writing or drawing pens, ie. H. e.g. B. pencils, crayons, crayons, wax crayons, or cosmetic pencils, d. H. e.g. B. masking, eyebrow, lip or kohl pencils.

The mine is made of at least one on a surface, e.g. B. paper for a writing or drawing pen or certain areas of skin for a cosmetic pen, applicable refill material formed or comprises at least one.

The lead is typically not very dimensionally stable or very soft - the pin is therefore typically a soft lead pin - so that at least a section of covering with a corresponding covering element is required or necessary. In principle, however, it is also conceivable that the lead is comparatively dimensionally stable or hard - the pin can therefore in principle also be a hard lead pin, from the lead of which the sheathing element encasing it must be temporarily removed in order to expose the lead.

Regardless of the structural properties of the mine, the mine is at least partially surrounded by a sheathing element or at least partially sheathed with a sheathing element. The sheathing element typically extends at least in sections along the exposed surface of the mine and therefore typically lies directly on the exposed surface of the mine. If the pin has no receiving element (housing), the sheathing element can form the exposed outer (upper) surface of the pin. There is typically a stable, in particular non-rotatable, connection between the casing element and the lead.

The sheathing element can prevent the mine from aging, oxidation or external influences, i. H. e.g. B. mechanical and / or thermal and / or climatic influences, in particular moisture, and / or in function of a "diffusion barrier" against diffusion, especially volatile, protect components of the mine. The aspect of a corresponding diffusion barrier can be of particular importance for embodiments of the pencil as a cosmetic pencil, since the leads of cosmetic pencils regularly contain volatile components.

The effect of a "diffusion barrier" can only result from the structural properties of the sheathing element; specifically, the sheathing element can inherently have a density or permeability which prevents the corresponding components of the mine from diffusing out.

If the sheathing element does not have an appropriate density or permeability, which prevents the corresponding components of the mine from diffusing out, a diffusion barrier to the mine components, in particular volatile ones, can also be formed by the sheathing element with corresponding volatile components the mine or these chemically similar volatile constituents is saturated or oversaturated. The respective concentrations or (small) differences in concentration of corresponding volatile constituents in the mine and in the sheathing element complicate or prevent the diffusion of the volatile constituents of the mine from the mine. A “depot effect” can also be obtained by saturating or oversaturating the sheathing element with corresponding volatile constituents of the mine or these chemically similar volatile constituents, which allows a diffusion of volatile constituents contained in the casing element into the mine, possibly even a back diffusion of volatile constituents diffused from the mine into the casing element back into the mine, so that a certain concentration of corresponding volatile constituents can be ensured in the mine.

In a variant, the pin can be gripped directly by the user or by the sheathing element sheathing it, in order to receive the refill, which is sheathed at least in sections. In one embodiment, the pin can be gripped by a user directly on the receiving element with a receiving element for receiving the lead, which is coated at least in sections.

The sheathing element at least in sections encasing the lead is formed at least in sections, in particular completely, from a wax-like material. In all cases, the sheathing element has at least in sections, in particular completely, a waxy and comparatively, ie. H. especially compared to pure plastics (polymers), soft, d. that is, as follows, in particular also not very impact-resistant.

The waxy nature of the casing element generally results in special material removal properties. The special material removal properties allow a particularly simple material removal from the sheathing element.

The wax-like nature of the sheathing element results in particular in special sharpening or molding properties. The special sharpening or molding properties allow simple sharpening or molding with comparatively soft, ie. H. especially unhardened, pointed elements. The waxy or soft nature of the sheathing element results from the chemical-physical or structural properties of the waxy material, which are explained in more detail below.

The wax-like nature of the sheathing element essentially determines the sharpening or molding properties. The sharpening or molding properties typically differ significantly from known wood or plastic-covered pencils; consequently, the torque required for sharpening or shaping with a conventional new sharpener device with a hardened and ground blade-shaped pointed element is typically significantly below the torque usually required for sharpening a wood- or plastic-mounted pencil. The torque of the lead required for sharpening or shaping can be significantly below 6 Ncm, in particular at 40 revolutions per minute.

In contrast to those for sharpening or shaping the pen or the lead Sheathed mines known from the prior art do not require any sharpening devices with mechanically particularly stable, ie in particular hardened, pointed elements, ie in particular pointed elements made of hardened steel. The wax-like nature of the sheathing element can possibly even remove material, e.g. B. by scraping, from the sheathing element, at least one deformation, ie a scratching of the sheathing element, with a fingernail.

Due to the wax-like nature of the sheathing element, the pin can therefore be easily made with pointed elements made of comparatively soft materials, i. H. e.g. B. sharpen comparatively soft or unhardened metals, in particular unhardened steels or plastics, without this causing extraordinary wear of the pointed elements. The pointed elements are therefore less stressed by sharpening the pencil compared to conventional pencils. It follows from this that the sheathing element is made of a comparatively soft material, i. H. e.g. B. a comparatively soft or unhardened metal, in particular unhardened steel or a plastic, formed pointed element can be easily removed or sharpened or molded. A comparatively soft metal is to be understood in particular as a metal with a hardness of at most 40 HRC (Rockwell hardness). In contrast, hardened steels, as have been hitherto required and used to sharpen known pencils for a certain stability or edge retention, typically have a hardness of at least 60 HRC (Rockwell hardness).

The possibility of sharpening the pen with unhardened metals, in particular unhardened stainless steels, or by means of pointed elements formed from plastics, in particular in connection with cosmetic sticks, also has a positive effect on the formation of corresponding sharpening devices, since these do not rust and therefore do not use rust protection measures, especially anti-rust paints, must be provided. The sharpener devices can be comparatively simple, i. H. for example by rinsing with water, clean without corroding.

The sheathing element differs significantly in its structural properties and thus in its sharpening or shaping properties from known sheaths of pins, typically formed from wood, wood substitutes or plastics (polymers). The wax-like material forming the sheathing element therefore does not represent a wood substitute due to its structural properties, in particular due to its special sharpening or molding properties.

Pointed elements of conventional sharpening devices usually have a cutting edge width of approximately 1 μm on the cutting edge. The cutting edge width of the pointed elements of conventional sharpener devices can be razor-sharp. From a cutting edge width of 5 µm, corresponding pointed elements are no longer suitable for sharpening conventional pencils than they are (with normal effort) no sharpening enable more. The cutting edge width is defined as follows: in the area of its free end, a pointed element has a curved or curved area through which the cutting edge radius is defined. The cutting edge width is defined by the distance between the opposite points of the pointed element at which the curved or curved region and thus the cutting edge radius begins, ie the distance between the respective points at which the pointed element merges tangentially into the cutting edge radius. This distance is comparatively small for sharp pointed elements, ie in particular below 5 µm, and comparatively large for blunt pointed elements, ie in particular (far) above 5 µm.

Compared to known wood or wood replacement material pens, the pen described here differs in particular in its shaping or sharpening behavior, as it has less fine or less sharp pointed elements (cutting) with cutting edge radii or cutting edge widths (far) above 10 µm , d. H. e.g. B. a cutting edge width of about 20 microns or (far) more, easily molded or pointed. Known pins made of wood or wood substitute material cannot be molded or pointed with such pointed elements.

Compared to known pins made of plastic, the pin described here differs in particular in its shaping or sharpening behavior, since it can be shaped or sharpened with less fine or sharp pointed elements (cutting) with cutting edge radii above 10 μm. As mentioned, the sheathing element of the pin described herein has a lower hardness than plastic sheathing of known pins. Furthermore, the torque required to sharpen the pin described herein is lower compared to known pins having plastic sheaths.

The wax-like material and thus also the sheathing element is formed from at least one wax-like component and at least one non-wax-like component. The waxy material accordingly also contains one or more (different) non-waxy components in addition to one or more (different) wax-like components. The proportion of the wax-like constituents is so high in comparison to the non-wax-like constituents that the covering element in any case has the wax-like nature mentioned. The wax-like component (s) also determines the particular structural properties described here, ie. H. in particular the special sharpening or shaping properties of the sheathing element.

Concrete proportions or quantities of the sheathing element, ie also concrete (quantity) proportions of the wax-like material, result from the respective concrete composition of the wax-like constituents and / or the (respective) concrete composition of the non-wax-like constituents. The share of wax-like components are typically at least 30% by weight, in particular above 50% by weight. Accordingly, the proportion of the non-wax-like constituents is typically at most 70% by weight, in particular below 50% by weight.

The wax-like material is typically such that the sheathing element fulfills the tasks typically required depending on the application, i. H. especially protection of the mine against external influences, d. H. mechanical and / or thermal and / or climatic influences, in particular moisture, and / or as a "diffusion barrier" before diffusing out, in particular volatile, components of the mine, so that the mine is not impaired in its original function and can be handled without problems leaves. The wax-like components influence the properties of the sheathing element in this respect, in particular with a view to improving the sharpening or molding properties.

The hardness of the sheathing element is below 60 Shore D. In particular, the hardness of the sheathing element lies in a hardness range between 10 and 50 Shore D. However, the hardness of the sheathing element can also be significantly below 10 Shore D when the pen is designed with a corresponding receiving element. The hardness of the sheathing element can be varied in a targeted manner through its specific proportionate or chemical composition, in particular the addition of non-wax-like components.

The impact strength of the sheathing element is typically below the impact strength of non-waxy polyolefinic polymers, i.e. H. especially below the impact strength of polyethylene and polypropylene.

A wax-like component can in particular be a wax.

Waxes can generally be defined using different chemical or physical or structural parameters or properties, which will be discussed in more detail below by way of example. The structural structure of the waxes is particularly important here, since this determines the chemical-physical or structural properties.

The structural structure of waxes typically consists of certain molecules or molecular compounds. The chemical-physical properties of waxes are essentially determined by the molecular weight or chain length of the molecules or molecular compounds. The molecular weight or chain length of the molecules or molecular compounds is typically below the molecular weight or chain length of, for. B. thermoplastic, plastics. Ethylene with a comparatively low molecular weight or a comparatively short chain length are therefore waxes. By increasing the molecular weight or chain length, the ethylenes lose their wax-like properties, they are no longer about wax-like materials, but about "solid" or "hard" plastics.

The structural structure of waxes is characterized by a coarse to fine crystalline structure. The coarse to fine crystalline structure also influences the optical properties of waxes. Waxes typically have some opacity.

Similarly, the structural structure requires a comparatively low abrasion resistance. The abrasion resistance is typically below the abrasion resistance of polyolefinic polymers.

With regard to the thermal properties, waxes are characterized by the fact that they go into a melt-like state at temperatures above 40 ° C without decomposition or do not change to a melt-like state at temperatures below 40 ° C. In principle, waxes are strongly temperature-dependent in their consistency and solubility. Typically, waxes are comparatively low-viscosity even at temperatures slightly above their respective melting points. At temperatures below their melting point, especially at temperatures of approx. 20 ° C, waxes are kneadable or solid to brittle hard. Of course, the wax-like constituent or the wax-like material in concrete designs of the pin can have, if necessary, significantly higher thermal stability than pure waxes. With regard to the mechanical properties, waxes are particularly characterized by a comparatively low hardness. As mentioned, the hardness of the sheathing element and thus of the wax-like material forming it is below 60 Shore D, in particular in a hardness range between 10 and 50 Shore D. As mentioned, the hardness of the sheathing element can be specifically targeted by its specific proportionate or chemical composition vary.

Waxes are easy to form, especially under the influence of comparatively low temperatures. In addition, waxes can be used to remove material with comparatively little force. H. especially remove chips. The material removal or chip formation is determined in particular by the brittleness of the respective wax. Waxes can remove material, e.g. B. by scraping, at least one deformation, d. H. allow scratching with a fingernail.

The above-mentioned chemical-physical or structural properties of waxes can of course vary depending on the specific structural structure or the specific proportionate or chemical composition of the waxes or wax-like components or wax-like materials formed from waxes. The structural properties of waxes in their solid state are particularly relevant for the wax-like material used to form the covering element.

The wax-like constituent can consist of at least one natural, in particular vegetable and / or animal and / or geological, wax and / or at least one synthetic Be wax formed. In this respect, the wax-like component can be a natural or synthetic wax or a mixture of (different) natural and / or (different) synthetic waxes. If a mixture of (different) natural and / or (different) synthetic waxes is present, these can be the same, similar or different in their structural properties, ie, for example in their melting points. A waxy material can therefore be used as waxy components such. B. low-melting waxes, that is, in particular in a temperature range between 40 and 60 ° C. melting waxes, and high-melting waxes, ie in particular in a temperature range between 80 and 160 ° C. melting waxes.

If the waxy component is formed from a natural wax, the natural wax can be formed from natural hydrocarbon compounds or contain natural hydrocarbon compounds. The molecular weight or chain length of the hydrocarbon compounds is largely responsible for the wax-like properties of natural wax. The molecular weight or chain length of the hydrocarbon compounds is therefore chosen (low) so that the hydrocarbon compounds form a wax. The same applies to other parameters relating to the hydrocarbon compounds, i. H. if necessary for degrees of branching and crosslinking.

In principle, all fossil or non-fossil waxes can be considered as natural waxes. Fossil waxes can be petroleum waxes, in particular ozokerite and macro- or microcrystalline fossil paraffin waxes. Fossil waxes can continue to be geological waxes, e.g. B. lignite, peat or montan waxes, in particular geological acid waxes, ester waxes or partially saponified waxes. Non-fossil waxes can be animal waxes, in particular bees, shellac, walrus or wool waxes. Non-fossil waxes can furthermore be vegetable waxes, in particular candelilla, carnauba, china, japan or sugar cane waxes. Natural waxes can generally be formed from at least one natural wax from the following group or contain at least one natural wax from the following group: beeswax, candelilla wax, carnauba wax, china wax, japan wax, walrus, wool wax, sugar cane wax, montan wax, earth wax.

If the wax-like constituent is formed from a synthetic wax, the synthetic wax can be formed from synthetic hydrocarbon compounds or contain synthetic hydrocarbon compounds. The molecular weight or chain length of the hydrocarbon compounds is largely responsible for the wax-like properties of the synthetic wax. The molecular weight or chain length of the hydrocarbon compounds is therefore chosen (low) so that the hydrocarbon compounds form a wax. The same applies to other parameters relating to the hydrocarbon compounds, ie where appropriate for degrees of branching and crosslinking. The hydrocarbon compounds are in particular oligomers which are present as waxes or have wax-like properties due to a comparatively low molecular weight or a comparatively short chain length.

In principle, all partially or fully synthetic waxes can be considered as synthetic waxes. Semi-synthetic waxes can include fatty acid amide waxes, especially distearyl ethylenediamides or erucamides, or hydrogenated fatty acid waxes, e.g. B. Soy wax produced by hydrogenation of soybean oil. Fully synthetic waxes can be (non-polar) polyolefin waxes, especially polyethylene or polypropylene waxes. Fully synthetic waxes can continue to Fischer-Tropsch waxes, i. H. waxes produced according to the Fischer-Tropsch process. Fully synthetic waxes can moreover be polar synthetic waxes, in particular oxidized or grafted polyolefin waxes or copolymer waxes. Synthetic waxes can generally be formed from at least one aliphatic or polyolefinic wax, in particular based on paraffin, polyethylene or polypropylene, or contain at least one aliphatic or polyolefinic wax, in particular based on paraffin, polyethylene or polypropylene.

The use of aliphatic or polyolefinic waxes is particularly expedient with regard to the molecular weights or chain lengths of the respective hydrocarbon compounds that can be specifically adjusted or influenced by means of controlled polymerization or oligomerization, and thus the properties of corresponding aliphatic or polyolefinic waxes that can be specifically adjusted by means of controlled polymerization or oligomerization . The use of aliphatic or polyolefinic waxes is also advisable due to the good processing properties and their non-toxic properties. In addition, the use of aliphatic or polyolefinic waxes can be advantageous from an economic point of view. Basically, aliphatic or polyolefinic compounds with a certain molecular weight or a certain chain length, regardless of whether these z. B. is amines, aldehydes, alcohols, ethers, esters, ketones, etc., have waxy properties.

A waxy ingredient can be formed from an ester compound, particularly a fatty acid ester compound, or a salt of a fatty acid ester compound (soap). Wax-like constituents can also, if necessary, saponify, fats or fatty acid ester compounds, e.g. B. based on palmitic or stearic acid, and / or natural resins or resin compounds.

The sheathing element can have a higher mechanical stability, in particular a higher dimensional stability or dimensional stability and / or a higher hardness than the lead. Despite its wax-like nature, the sheathing element is sufficiently stable, ie in particular dimensionally stable, that it does not deform when the pin is used as intended. A higher mechanical stability in comparison, in particular a higher dimensional stability or dimensional stability, of the sheathing element results from the Addition of certain non-waxy components, ie thermoplastic materials (polymers), such as polyethylene or polypropylene.

In principle, it is possible (also) for the lead to be formed from a wax-like material or to comprise at least one such. This can be especially the case with chalk or wax crayons, i.e. H. especially wax crayons or cosmetic pencils. The wax-like material of the lead and the wax-like material of the casing element typically differ in their chemical and / or in their physical, in particular mechanical, properties. As mentioned, the sheathing element can have a higher mechanical stability, in particular a higher dimensional stability or dimensional stability and / or a higher hardness, and thus have different structural properties than the lead.

The lead and the sheathing element can, in particular in one piece, also be formed from the same wax-like material. The sheathing element can then, on the basis of at least one measure carried out in the area of its surface, to increase the mechanical stability, in particular the dimensional stability or dimensional stability and / or the hardness, in particular a treatment with high-energy radiation, for. B. electron or UV radiation, a higher mechanical stability, in particular a higher dimensional stability or dimensional stability and / or a higher hardness than the lead.

The, in particular in one piece, formation of the lead and the sheathing element from the same wax-like material can bring advantages in terms of production technology. The sheathing element can be formed by carrying out a corresponding measure close to the surface to increase the dimensional stability and / or the mechanical stability. By varying certain process engineering parameters, i.e. H. in particular the duration, energy density, intensity, etc., the measure can be the sheathing element with certain structural properties, d. H. e.g. B. a desired thickness, dimensional stability or mechanical stability.

Of course, it is possible to provide the covering element in the region of its exposed outer (upper) surfaces with a coating or covering at least in sections in order to specifically influence the haptic impression when the covering element is touched or the pen is handled. A corresponding coating can e.g. B. be formed by a varnish, which can be removed when sharpening or molding the pen. A corresponding wrapping can, for. B. be formed by a paper or cellulose material, which can be removed (with) when sharpening or molding the pin.

Different variants of the casing of the lead by the casing element are explained in more detail below. These are always based on an elongated, ie in particular cylindrical or prismatic, geometric shape of the mine or Pin.

Starting from a mine having an elongated geometric shape, the sheathing element can either sheath the mine at least in sections only in the region of its long side or sheath the mine in the region of its long side and in the region of at least one free end of the mine. In the case of a brand-new pencil, both free ends of the lead can optionally also be covered, so that the covering element in the region of the free end forming the lead tip must be removed before using the pencil. A complete casing of the lead can be useful, for example, for the transport and storage of brand new pens, in particular brand new soft lead pens, since the lead is thus protected from external influences.

As mentioned, the pin can comprise a receiving element for receiving the lead, which is sheathed at least in sections. The lead, which is sheathed at least in sections, is then accommodated in the receiving element at least in sections. The receiving element can have a (hollow) cylindrical or prismatic outer geometric shape or basic shape and a, in particular cylindrical, receiving or interior space for receiving the lead or other components of the pin. The receiving element can also be referred to or regarded as the housing of the pin. The receiving element can be formed from a polymer plastic (polymer).

If the pin comprises a corresponding receiving element for receiving the lead, which is coated at least in sections, it can further comprise a mine feed device which is set up to move the lead, which is encased in the receiving element, in one movement, i. H. in particular in an axial feed movement relative to the receiving element. The mine feed device therefore serves to exert a force on the mine accommodated in the receiving element, which results in an axial advancing movement of the mine relative to the receiving element. Of course, the mine feed device can in principle also be used to implement an axial return movement of the mine opposite to an axial feed movement. An axial push-back movement of the mine can, however, possibly be prevented by suitable locking elements, so that the mine can only be set in an axial feed movement. The mine feed device can comprise an actuating element which can be coupled or coupled to the mine and which is operated by a user, e.g. B. can be operated via an actuating section to set the mine in a corresponding movement relative to the receiving element.

A sharpener for a pen as described above is designed to sharpen the lead of the pen. The sharpener device is characterized in that it has at least one made of a comparatively soft material, ie, for example, an uncured metal, in particular an uncured steel or stainless steel, or a Plastic, in particular polyamide, polycarbonate or polyethylene terephthalate, formed, typically blade-shaped or knife-shaped, pointed element. The sharpener device can be made in one piece. In the sharpener, it can be, for. B. is an injection molded part made of an injection moldable plastic. In the case of a sharpener device comprising an (additional) facet knife, that is to say, for example, a sharpener device for a cosmetic pencil, the facon knife can thus be formed in one piece with the, in particular blade or cutting-shaped, pointed element and / or other components of the sharpener device.

The possibility of sharpening or shaping the coated lead by pointed elements formed from uncured metals, in particular uncured steels or stainless steels or plastics, has a positive effect on the sharpener or the pointed elements associated therewith, in particular in connection with cosmetic pencils , since they do not rust and therefore do not have to be provided with rust protection measures, especially rust protection varnishes. The sharpener devices can be comparatively simple, i. H. for example by rinsing with water, clean without corroding.

Fig. 1 - 3

je eine Prinzipdarstellung eines Stifts gemäß einem Ausführungsbeispiel;

Fig. 4

eine Prinzipdarstellung einer Spitzereinrichtung zum Anspitzen des in den Fig. 1, 2 oder 3 gezeigten Stifts;

Fig. 5, 6

je eine Prinzipdarstellung eines Stifts gemäß einem weiteren Ausführungsbeispiel.

The invention is explained in more detail using exemplary embodiments in the drawing figures. Show:

1 - 3

a schematic representation of a pen according to an embodiment;

Fig. 4

a schematic diagram of a sharpener for sharpening the in 1, 2 or 3 shown pen;

5, 6

a schematic representation of a pen according to another embodiment.

Fig. 1 shows a schematic diagram of a pin 1 according to a first embodiment. The pin 1 is in Fig. 1 shown in a longitudinal section.

The pin 1 comprises a mine 2. The mine 2 comprises an elongated base body 3. The mine 2 is made of a on a surface, for. B. paper for a writing or drawing pen or certain areas of skin for a cosmetic pen, applicable lead material formed or comprises at least one.

The lead 2 is not very dimensionally stable or very soft - the pin 1 is therefore a soft lead pin - so that a covering with a covering element 4, at least in sections, is required or necessary. In principle, however, it would also be conceivable that the lead 2 is comparatively dimensionally stable or hard - the pin 1 could in principle also be a hard lead pin, from the lead 2 of which the sheathing element 4 encasing it must be temporarily removed, around the lead 2 exposed. The mine 2 is surrounded in sections by a sheathing element 4 or sheathed in sections with a sheathing element 4. The sheathing element 4 extends at least in sections along the exposed surface of the mine 2 and therefore lies directly on the exposed surface of the mine 2. There is a stable, in particular non-rotatable, connection between the casing element 4 and the lead 2.

As can be seen, the sheathing element 4 sheaths the lead 2 in the region of its long side and in the region of a free end, so that the sheathing element 4 in the area shown in FIG Fig. 1 shown longitudinal section has a U-shaped geometric shape. The sheathing element 4 forms (essentially) the exposed outer (upper) surface of the lead 2 or the pin 1.

The sheathing element 4 protects the mine 2 against aging, oxidation and external influences, i. H. in particular mechanical and / or thermal and / or climatic influences, in particular moisture, and / or in the function of a “diffusion barrier” before the diffusion out, in particular volatile, components of the mine 2.

The pin 1 can in principle be any type of pin 1 which has a correspondingly coated lead 2. For example, the pen 1 may be a writing or drawing pen, i. H. e.g. B. a pencil, crayon, crayon, crayon, or a cosmetic pencil, d. H. e.g. B. act a masking, eyebrow, lip or kohl pencil.

The sheathing element 4 sheathing the mine 2 in sections is formed from a wax-like material. The sheathing element 4 thus has a waxy and comparatively soft nature. The waxy or soft nature of the covering element 4 results from the chemical-physical or structural properties of the waxy material.

The waxy nature of the sheathing element 4 results in special material removal properties, i. H. in particular in special sharpening or molding properties, which particularly easy material removal from the sheathing element 4, in particular a particularly simple sharpening or molding with comparatively soft, ie. H. allow in particular uncured, pointed elements 5.

Due to the wax-like and comparatively soft nature of the sheathing element 4, the sharpening or molding properties of the pin 1 differ significantly from wood-covered pins; so z. B. the torque required for sharpening or shaping well below that for sharpening a known wood or plastic-mounted pin with a conventional mint sharpener device with a hardened and ground point element required torque. For sharpening or shaping the pin 1 or the lead 2, no sharpener devices with mechanically particularly stable, ie in particular hard, pointed elements 5, ie in particular pointed elements 5 made of hardened steel, are required. The wax-like nature of the sheathing element 4 can possibly even remove material, e.g. B. by scraping, from the sheathing element 4, allow at least one deformation, ie a scratching of the sheathing element 4, with a fingernail.

Due to the wax-like nature of the sheathing element 4, the pin 1 can already be easily made with pointed elements 5 made of comparatively soft materials, i. H. e.g. B. sharpen comparatively soft or unhardened metals, in particular unhardened steels or plastic, without this causing an unusual wear of the pointed elements 5. The pointed elements 5 are less stressed by the sharpening in comparison to conventional mines. It follows from this that the sheathing element 4 is made of a comparatively soft material, ie. H. e.g. B. a comparatively soft or unhardened metal, in particular unhardened steel or a plastic, formed sharpener 5 can be easily removed or sharpened or molded or molded. A comparatively soft metal is to be understood in particular as a metal with a hardness of at most 40 HRC (Rockwell hardness). In contrast, hardened steels, as have been hitherto required and used to sharpen known pencils for a certain stability or edge retention, typically have a hardness of at least 60 HRC (Rockwell hardness).

The sheathing element 4 differs significantly in its structural properties, in particular in its pointed or molding properties, from known sheaths of pins, which are typically formed from wood or wood substitutes. The wax-like material forming the sheathing element 4 does not represent a wood substitute due to its structural properties, in particular its special sharpening or molding properties.

The wax-like material and thus also the sheathing element 4 is formed from at least one wax-like component and at least one non-wax-like component. The proportion of the wax-like constituents is so high compared to the non-wax-like constituents that the sheathing element 4 in any case has the wax-like nature mentioned. Concrete proportions or quantities of the sheathing element 4, ie also concrete (quantity) proportions of the wax-like material, result from the respective concrete composition of the wax-like constituents and / or the (respective) concrete composition of the non-wax-like constituents. The proportion of the wax-like constituents is typically at least 30% by weight, in particular above 50% by weight.

The wax-like material is such that the covering element 4 fulfills the above-mentioned tasks, i.e. H. especially protection of the mine 2 from external influences, d. H. in particular mechanical and / or thermal and / or climatic influences, in particular moisture, and / or in the function of a "diffusion barrier" before diffusing out, in particular volatile, components of the mine 2, or in the function of a "depot" a diffusion in which with volatile constituents of the mine 2 saturated or oversaturated sheathing element 4 contains volatile constituents into the mine 2, so that the mine 2 is not impaired in its original function and can be handled without problems. The wax-like material influences the properties of the sheathing element 4 in this respect, in particular with a view to improving the sharpening or molding properties.

The hardness of the sheathing element 4 is (clearly) below 60 Shore D, in particular in a hardness range between 10 and 50 Shore D. The impact resistance of the sheathing element 4 is below the impact resistance of polyolefinic polymers, ie. H. especially below the impact strength of polyethylene and polypropylene.

Wax-like constituents of the waxy material can be formed from at least one natural, in particular vegetable and / or animal and / or geological, wax and / or at least one synthetic wax. In this respect, wax-like components can be natural or synthetic wax or a mixture of different natural and / or synthetic waxes.

In the exemplary embodiments shown in the figures, the wax-like material contains at least z. B. a synthetic wax. The synthetic wax is formed from synthetic hydrocarbon compounds or contains synthetic hydrocarbon compounds. The molecular weight or chain length of the hydrocarbon compounds is largely responsible for the wax-like properties of the synthetic wax. The molecular weight or chain length of the hydrocarbon compounds is so small that the hydrocarbon compounds form a wax. The same applies to other parameters relating to the hydrocarbon compounds, i. H. if necessary for degrees of branching and crosslinking. The hydrocarbon compounds are, in particular, oligomers which are present as waxes or have wax-like properties due to a comparatively low molecular weight or a comparatively short chain length.

In principle, all partially or fully synthetic waxes can be considered as synthetic waxes. Synthetic waxes can generally be formed from at least one aliphatic or polyolefinic wax, in particular based on paraffin, polyethylene or polypropylene, or contain at least one aliphatic or polyolefinic wax, in particular based on paraffin, polyethylene or polypropylene. In the exemplary embodiments shown in the figures, the synthetic wax is a polyolefin wax, namely a synthetic polyethylene wax.

The use of polyolefinic waxes is particularly expedient with regard to the molecular weights or chain lengths of the respective hydrocarbon compounds that can be specifically adjusted or influenced by means of controlled polymerization or oligomerization, and thus the properties of corresponding polyolefinic waxes that can be specifically adjusted by means of controlled polymerization or oligomerization. The use of polyolefinic waxes is also advisable due to the good processing properties and their non-toxic properties. In addition, the use of polyolefin waxes can be useful from an economic point of view.

As mentioned, the sheathing element 4 could also contain at least one natural wax as wax-like constituents. A natural wax is formed from natural hydrocarbon compounds or contains natural hydrocarbon compounds. The molecular weight or chain length of the hydrocarbon compounds is also so low that the hydrocarbon compounds form a wax. The same applies to other parameters relating to the hydrocarbon compounds, i. H. if necessary for degrees of branching and crosslinking.

In principle, all fossil or non-fossil waxes can be considered as natural waxes. Natural waxes can generally be formed from at least one natural wax from the following group or contain at least one natural wax from the following group: beeswax, candelilla wax, carnauba wax, china wax, japan wax, walrus, wool wax, sugar cane wax, montan wax, earth wax.

In spite of its wax-like nature, the sheathing element 4 is sufficiently stable, ie in particular dimensionally stable, so that it does not deform when the pin 1 is used as intended. The sheathing element 4 can have a higher mechanical stability, in particular a higher dimensional stability or dimensional stability and / or a higher hardness than the lead 2. The higher mechanical stability, in particular a higher dimensional stability or dimensional stability, of the sheathing element 4 results from the addition of non-wax-like components, ie an addition of thermoplastic material. Unless, as in the in the Fig. 3 , 5 Embodiments shown, a receiving element 7 for receiving the coated lead 2, the covering element 4 can also have a lower mechanical stability, in particular a lower dimensional stability or dimensional stability and / or a lower hardness than the mine 2.

In principle, it is possible that the lead 2 is also formed from a wax-like material or comprises at least one of these. This can be the case in particular with chalk or wax pencils, ie in particular wax crayons, or cosmetic pencils. The waxy The material of the lead 2 and the waxy material of the casing element 4 can typically differ in their chemical and / or in their physical, in particular mechanical, properties. As mentioned, the sheathing element 4 can have a higher mechanical stability, in particular a higher dimensional stability or dimensional stability and / or a higher hardness, and thus have different structural properties than the lead 2.

Fig. 2 shows a schematic diagram of a pin 1 according to another embodiment. Pen 1 is also in Fig. 2 shown in a longitudinal section.

In contrast to the one in Fig. 1 The embodiment shown is the lead 2 and the sheathing element 4 in the in Fig. 2 Embodiment shown, as indicated by the dashed lines in the area of the interface between the mine 2 and the sheathing element 4, formed in one piece, ie from the same wax-like material. The sheathing element 4, however, has a measure carried out in the area of its surface to increase the mechanical stability, in particular the dimensional stability or dimensional stability and / or the hardness, in particular a treatment with high-energy radiation, eg. B. electron or UV radiation, a higher mechanical stability, in particular a higher dimensional stability or dimensional stability and / or a higher hardness than the mine 2.

Forming the lead 2 and the sheathing element 4 from the same wax-like material has manufacturing advantages. The sheathing element 4 is formed by carrying out a corresponding measure close to the surface in order to increase the dimensional stability and / or the mechanical stability. By varying certain process engineering parameters, i.e. H. In particular, duration, energy density, intensity, etc., the measure can the sheathing element 4 with certain structural properties, d. H. e.g. B. a desired thickness, dimensional stability, mechanical stability, etc., are formed.

As in Fig. 2 is indicated by the dotting in the area of the mine tip 6, it would in principle also be possible for the sheathing element 4 to completely sheath the mine 2 in a brand-new pin 1. In the case of a brand-new pen 1, both free ends of the lead 2 can also be encased, so that the encasing element 4 in the region of the free end which later becomes the lead tip 6 must be removed before using the pen 1. A complete casing of the lead 2 can be useful, for example, for the transport and storage of brand new pens 1, in particular brand new soft lead pens, since the lead 2 is thus protected from external influences.

Fig. 3 shows a schematic diagram of a pin 1 according to another embodiment. Pen 1 is also in Fig. 3 shown in a longitudinal section.

The in Fig. 3 shown pin 1 differs from that in the 1, 2 shown pins 1 in that it is a, for. B. formed from a plastic, receiving element 7 for receiving the coated with a sheathing element 4 mine 2. The mine 2 is received in sections in the receiving element 7. The receiving element 7 has a (hollow) cylindrical or prismatic outer geometric shape or basic shape and a, in particular cylindrical, receiving or interior space for receiving the lead 2 or other components of the pin 1. The receiving element 7 can be referred to or regarded as the housing of the pin 1.

The in Fig. 3 shown pin 1 differs from that in the 1, 2 shown pins 1 in that it includes a mine feed device 8, which is set up to set the coated lead 2 received in the receiving element 7 in a movement, that is, in particular in an axial feed movement, relative to the receiving element 7 (see also here that in the Fig. 5 , 6 shown embodiment). The mine feed device 8 thus serves to exert a force on the mine 2 received in the receiving element 7, which results in an axial advancing movement of the mine 2 relative to the receiving element 7. Of course, an axial return movement of the lead 2 opposite to an axial feed movement can in principle also be realized via the mine feed device 8. An axial push-back movement of the mine 2 can, however, optionally be prevented by suitable locking elements (not shown), so that the mine 2 can only be set in an axial feed movement. The mine feed device 8 comprises an actuator 9 coupled to the mine 2, which can be moved by a user, e.g. B. can be operated via an actuating section in order to set the mine 2 in a corresponding movement relative to the receiving element 7.

Although in the 1 - 3 not shown, it is possible to provide the sheathing element 4 in the region of its exposed outer (upper) surfaces at least in sections with a coating or sheathing in order to specifically influence the haptic impression when the sheathing element 4 is touched or the pin 1 is handled . A corresponding coating can e.g. B. be formed by a varnish, which can be removed when sharpening or molding the pin 1. A corresponding wrapping can, for. B. be formed by a paper or cellulose material, which can be removed (with) when sharpening or molding the pin 1.

Fig. 4 shows a schematic diagram of a sharpener device 10 for sharpening or shaping the in the 1, 2 or 3 shown pin 1, which is not the subject of the invention. The sharpener 10 is in Fig. 4 shown in a perspective view.

The sharpener device 10 comprises a blade-shaped or knife-shaped pointed element 5. The sharpener device 10 and the pointed element 5 can be integrally, for. B. made of a plastic.

The pointed element 5 is made of a comparatively soft material, i.e. H. an uncured metal, especially an uncured steel or stainless steel. The pointed element 5 could also be formed from a plastic, in particular polyamide, polycarbonate or polyethylene terephthalate.

The possibility of sharpening or shaping the pin 1 by means of pointed elements 5 formed from unhardened metals, in particular unhardened steels or stainless steels or plastics, has a positive effect on the sharpener device 10 or the pointed elements 5 associated therewith, in particular in connection with cosmetic sticks , since they do not rust and therefore do not have to be provided with rust protection measures, especially rust protection varnishes. The sharpener devices 10 can be comparatively simple, i. H. for example by rinsing with water, clean without corroding.

The Fig. 5 , 6 each show a schematic representation of a pin 1 according to a further embodiment. The pin 1 is in Fig. 5 in a partially broken exploded view, from which the individual components of the pin 1 according to the further embodiment can be seen in more detail, and in Fig. 6 shown in a partially broken view of the assembled state of the pin 1.

The pin 1 comprises a receiving element 7 with a hollow cylindrical receiving section 11 for receiving the lead 2 coated with a corresponding covering element 4 and a covered lead 2 which can be received or received in the receiving section 11. The receiving element 7 can also be referred to as a housing of the pin 1 or are considered in which various further components of the pin 1, in particular the lead 2, can be received or received.

As mentioned, in exemplary embodiments with corresponding receiving elements 7, the sheathing element 4 can have a lower mechanical stability, in particular a lower dimensional stability or dimensional stability and / or a lower hardness than the lead 2. The sheathing element 4 can only take on the function of protecting the mine 2 against aging or the function of a “diffusion barrier”.

A pin element 13 is associated with the pin 1. The cap element 13 can be fastened or fastened to the receiving element 7 in a rotationally fixed manner in the region of a free or open end. The cap element 13 is therefore not rotatable relative to the receiving part 2 and / or the receiving part 2 cannot be rotated relative to the cap element 13. The cap member 13 serves to axially protrude from the receiving element 7 and the hollow cylindrical receiving portion 11 free end of the lead 2 when the pin 1 is not in use, e.g. B. to protect against mechanical as well as climatic influences. The cap element 13 can therefore also be referred to or regarded as a protective cap.

In order to prevent unintentional removal of the cap element 13 from the receiving element 7, the receiving element 7 can be provided in the region of an axial projection 12 with at least one projection (not shown) which, when the cap element 13 is fastened to the receiving element 7, in a corresponding manner on the inner periphery of the cap member 13 formed groove-like recess (not shown) engages.

The cap element 13 has a shaping device or sharpener device 10, which can be arranged or arranged in a rotationally fixed manner therein, for shaping or tipping the coated lead 2 accommodated in the receiving element 7. The sharpener device 10 can be formed (integrally) with a pointed element 5 made of plastic. A shaping or sharpening of the coated lead 2 accommodated in the receiving element 7, ie. H. the axially protruding from the receiving element 7 free end of the mine 2, possible. The functionality of the cap member 13 is thus about the protection of the mine 2, for. B. from mechanical as well as climatic influences.

The rotationally fixed arrangement of the sharpener device 10 in the cap element 13 can be achieved by a form-fitting interaction of the form-locking elements 15 on the sharpener device side with corresponding counter-element elements 16 on the cap element side, i. H. a form-fitting engagement of the projections on the sharpener side in corresponding receptacles on the cap element side. The rotationally fixed arrangement of the sharpener 10 in the cap member 13 can therefore be damage or non-destructive, for. B. for the purpose of an exchange and / or cleaning of the sharpener 10 and / or the cap member 13, temporarily suspended.

The pin 1 comprises a mine feed device 8 which is formed from a plurality of components which are operatively connected to one another. Via the mine feed device 8, the lead 2 received in the receiving element-side receiving section 11 (with the cap element 13 fastened to the receiving element 7) moves axially in the direction of the sharpener device on the cap element side 10 removable. The mine feed device 8 thus serves to exert a force on the mine 2 received in the receiving element-side receiving section 11, which results in a feed movement of the mine 2 in the direction of the sharpener device 10 on the cap element side. A return feed movement of the lead 2 opposite to a corresponding feed movement is of course also possible via the mine feed device 8.

The mine feed device 8 is designed such that a feed movement of the mine 2 is adapted to a removal volume of the sharpener device 10 defined for a given defined feed movement of the mine 2, so that the feed volume given the given defined feed movement of the mine 2 is not greater than that Removable volume can be removed via the sharpener device 10 at the given defined feed movement of the mine 2. The feed volume of mine 2 defined by the feed movement of mine 2 per full revolution or partial revolution of mine 2 by a certain angular dimension does not exceed the maximum removal volume that can be removed per full revolution or partial revolution of mine 2 by a certain angular dimension.

As can be seen, the receiving element 7 is formed at least in sections with an internal thread. The receiving element 7 is also in the region of an end face, ie. H. in the area of the axial extension 12, with coupling elements 17 in the form of projections for the positive formation of a rotationally fixed coupling with the corresponding counter-coupling element (not shown) on the part of the cap element 13.

The mine feed device 8 comprises a hollow cylindrical guide element 18 which can be axially received in the receiving part 11 on the receiving part side with guide sections 19 in the form of longitudinal recesses for axially guiding a cup-shaped or basket-shaped lead holding part 20 relative to the guide element 18 and a corresponding cup or can be received axially in the guide element 18 basket-shaped lead holding element 20 for holding the lead 2. The lead 2 is rotatably mounted in the lead holding element 20, which is due to the interaction of the lead-side positive locking elements 22, e.g. B. in the form of projections with mine holding element-side counter positive locking elements 23, z. B. is realized in the form of groove-like recordings. The lead-holding element 20 has counter-guide portions 21 corresponding to the guide-part-side guide portions 19 in the form of projections, by means of which the lead-holding element 20 is guided or supported axially movably on or in the guide element 18.

In the region of the end of the guide element 18 facing away from the cap element 13, a handling element 14 forming a bottom section of the pin 1 is arranged or formed. The handling element 14 is formed here in one piece with the guide element 18 and thus connected to the guide element 18 in a rotationally fixed manner.

The operating principle of the mine feed device 8 provides that the mine 2 accommodated in the mine holding element 20 can be set into an axial feed movement in the direction of the sharpener device 10 on the cap element side via the mine feed device 8. This is done in such a way that the guide element 18 or the handling element 14 connected to it in a rotationally fixed manner is set into a rotational movement relative to the receiving part 2 (cf. Fig. 6 , Arrow P1). In order to set the guide element 18 in a rotational movement, a user of the pin 1 grips the guide element 18 or the handling element 14 connected in a rotationally fixed manner and rotates it relative to the receiving element 7 and the cap element 13 connected in a rotationally fixed manner thereto. The axis of rotation corresponds to the axis of symmetry of the pin 1 or the axis of symmetry of the hollow cylindrical components of the pin 1.

By rotating the guide element 18, the lead holding element 20 is caused to rotate in the same direction due to the rotationally fixed connection to the guide element 18. The lead holding element 20 is now due to the engagement of the internal thread formed on the receiving element 7 with an external thread formed on the lead holding part counter guide sections 21 in an axial movement, ie depending on the direction of rotation of the guide element 18 or handling element 14 in a feed movement (cf. Fig. 6 , Arrow P2) in the direction of the cap element-side sharpener 10 or in a push-back movement in an opposite direction, displaceable or offset.

How out Fig. 6 results, the operating principle of the mine feed device 8 additionally includes that the cap element 13 (along with the sharpener device 10 arranged or formed therein in a rotationally fixed manner), together with the receiving element 7 rotatably connected to the cap element 13, can also be rotated relative to the guide element 18 or the handling element 14 (cf. . Fig. 6 , Arrow P3). For this purpose, the guide element 18 or the handling element 14 and the cap element 13 together with the receptacle element 7, which is non-rotatably connected to the cap element 13, are to be rotated in opposite directions of rotation (cf. Fig. 6 , Arrows P1, P3). The respective axis of rotation in turn corresponds to the axis of symmetry of the pin 1 or the axis of symmetry of the hollow cylindrical components of the pin 1.

For that in the Fig. 5 , 6 The exemplary embodiment shown applies that the internal thread formed there on the receiving element 7, viewed axially, can in principle also be formed on other axial regions of the receiving element 7.

For that in the Fig. 5 , 6 The exemplary embodiment shown furthermore applies that the internal thread on the receiving element side can already be formed by part of an internal thread, ie at least one internal thread flank or an internal thread section. The internal thread can e.g. B. be formed by at least one (with respect to the symmetry or central axis of the receiving element 7) radially inward, in particular nose-like, projection. The same applies analogously to the external thread on the mine holding element side, ie this can also be formed by a part of an external thread, ie at least one external thread flank or an external thread section.

REFERENCE SIGN LIST

1

pen

2nd

mine

3rd

Mine body

4th

Sheathing element

5

Sharpener

6

Mine tip

7

Receiving element

8th

Mine feed device

9

Actuator

10th

Sharpener

11

Receiving section

12

approach

14

Handling element

13

Cap element

15

Positive locking element

16

Counter positive locking element

17th

Coupling element

18th

Guide element

19th

Guide section

20th

Mine holding element

21

Counter guide section

22

Positive locking element

23

Counter positive locking element

Claims (16)

1. Pencil (1), comprising a lead (2) and a casing element (4) which encases said lead, at least in portions, wherein the casing element (4) is formed, at least in portions, in particular completely, from a waxy material, wherein the waxy material consists of at least one waxy constituent and at least one non-waxy constituent, wherein the non-waxy constituent is formed from a thermoplastic, wherein the hardness of the casing element (4) is below 60 Shore D, in particular between 10 and 50 Shore D.
2. Pencil according to claim 1, characterized in that the waxy constituent is formed from at least one natural, in particular vegetable and/or animal and/or geological, wax and/or at least one synthetic wax.
3. Pencil according to claim 2, characterized in that the waxy constituent is formed from a natural wax, the natural wax being formed from natural hydrocarbon compounds or containing natural hydrocarbon compounds.
4. Pencil according to claim 3, characterized in that the natural wax is formed from at least one natural wax of the following group or contains at least one natural wax of the following group: beeswax, candelilla wax, carnauba wax, Chinese wax, Japanese wax, spermaceti, lanolin, sugar cane wax, montan wax, and earth wax.
5. Pencil according to claim 2, characterized in that the waxy constituent is formed from at least one synthetic wax, the synthetic wax being formed from synthetic hydrocarbon compounds or containing synthetic hydrocarbon compounds.
6. Pencil according to claim 5, characterized in that the synthetic wax is formed from at least one aliphatic wax, in particular based on paraffin, polyethylene or polypropylene, or contains at least one aliphatic wax, in particular based on paraffin, polyethylene or polypropylene.
7. Pencil according to claim 1, characterized in that the waxy constituent is formed from at least one ester compound, in particular at least one fatty acid ester compound, or at least one salt of a fatty acid ester compound.
8. Pencil according to any of the preceding claims, characterized in that the non-waxy constituent is formed from a polyolefin thermoplastic.
9. Pencil according to any of the preceding claims, characterized in that the casing element (4) has greater mechanical stability, in particular greater shape retention or shape stability and/or greater hardness, than the lead (2).
10. Pencil according to any of the preceding claims, characterized in that the lead (2) is formed from a waxy material or comprises at least one material of this kind, the waxy material of the lead (2) and the waxy material of the casing element (4) differing in the chemical properties thereof and/or in the structural, in particular mechanical, properties thereof.
11. Pencil according to claim 10, characterized in that the lead (2) and the casing element (4) are formed, in particular integrally, from the same waxy material, the casing element (4) having greater mechanical stability, in particular greater shape retention or shape stability and/or greater hardness than the lead (2) due to at least one measure carried out in the region of the surface of said casing element to increase the mechanical stability, in particular the shape retention or shape stability and/or the hardness, in particular a treatment using high-energy radiation.
12. Pencil according to any of the preceding claims, characterized in that the casing element (4) forms a diffusion barrier against volatile constituents of the lead (2) that are contained in the lead (2).
13. Pencil according to any of the preceding claims, characterized in that the casing element (4) is saturated or oversaturated with volatile constituents of the lead (2) or volatile constituents that are chemically similar thereto.
14. Pencil according to any of the preceding claims, characterized in that the lead (2) has an elongate geometric shape, the casing element (4) either encasing the lead (2), at least in portions, only in the region of the longitudinal side thereof or the casing element (4) encasing the lead (2), at least in portions, in the region of the longitudinal side thereof and in the region of at least one free end, optionally both free ends, of the lead (2).
15. Pencil according to any of the preceding claims, characterized by a receiving element (7) for receiving the lead (2), the lead (2) being received, at least in portions, in the receiving element (7).
16. Pencil according to claim 15, characterized by a lead feeding device (8) which is designed to shift the lead (2) received in the receiving element (7) in a movement relative to the receiving element (7).

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