EP2409854A2 - Sharpener, in particular for a cosmetic or pharmaceutical pencil - Google Patents

Abstract

The sharpener (1) comprises a sharpener body (20), in which a pencil guide channel (26) is introduced. The pencil guide channel comprises a circular cone-shaped channel section (28) and flows into a pencil insert opening (25) at the outer side of the sharpener body. A contour tool (23) is provided for insertion of a shoulder (9) in the pencil tip (6). A shaping knife is provided, which is made of steel or plastic.

Description

The invention relates to a sharpener for a pen, in particular for a cosmetic or pharmaceutical pen.

A sharpener is usually used to sharpen the lead of a pen, thereby peeling off an optional lead envelope - hereinafter also referred to as (pencil) sheath - in the region of the pen tip. Conventionally, a sharpener comprises an approximately cuboidal or wedge-shaped sharpener body, in which a pin guide channel is introduced with a substantially circular conical pointed cone as a guide for the pen tip such that its lateral surface approximately tangent to an outer surface of the sharpener body. In the vicinity of this tangent, the pointed cone is opened via a chip ejection slot to the adjacent outer surface of the sharpener body. A sharpener further comprises a paring knife, which is fixed tangentially with respect to the lateral surface of the pointed cone on the sharpener body and protrudes with a cutting edge into the chip ejection slot such that upon rotation of a pin inserted into the cone taper with respect to the sharpener body by the cutting edge of the peeling knife a chip of lifted off the pen.

Even with the use of high-quality pencils and sharpeners is usually in the area in which emerges at the sharpened pen tip, the mine from the jacket, no more uniform - in particular smooth or straight - transition between the jacket material and the lead material achieved. Rather, this transition in a sharpened pen is often crooked and frayed more or less ragged or frayed. This is partly due to the fact that the pin is always guided in the pin guide channel with a certain amount of play, and therefore usually not precisely centered during sharpening and rests axially parallel in the pin guide channel. On the other hand, the mine is usually not exactly centric, but embedded with some eccentric tolerance in the jacket material. This effect is reinforced by the fact that the sheath material tends to splinter in the transition area due to its zero material thickness. The transition between lead and sheath material in the area of the pen tip is referred to below as the "sheath edge".

In writing and crayons disturbs the uneven edge of the coat mainly for reasons of aesthetics. In addition, in the case of a cosmetic or pharmaceutical stick, the uneven edge of the casing is also problematic in terms of skin compatibility. If such a pin is not sharpened regularly, the jagged edge of the jacket, when used, comes in close proximity to the area of the skin on which the lead material is applied and may cause skin irritations or injuries and associated pain or even infections. This is particularly problematic from the additional point of view that cosmetic and pharmaceutical sticks are often applied to particularly sensitive skin areas, e.g. Eyelids or lips, are used.

The invention has for its object to provide a pen sharpener, which is particularly suitable for use to produce a particularly uniform jacket edge when used properly in the pen tip of the sharpened pin.

According to the invention, this object is achieved by the sharpener provided for sharpening a pin comprising a lead, as well as a pin comprising this enveloping pencil sheath, in which a pin guide channel is inserted. The pin guide channel comprises at least one circular cone-shaped channel section with a base diameter which slightly exceeds the diameter of the pin to be sharpened. This circular-cone-shaped channel section is also referred to below as "pointed cone". On the outside of the sharpener body, the pin guide channel opens into a pin insertion opening.

Furthermore, the sharpener comprises an approximately tangential to the lateral surface of the pointed cone employed peeling knife. The peeling knife is used to peel off a pen tip, which in a pin of the above type necessarily includes a front lead portion and a rear cover portion. In this case, the term "mine section" refers to that section of the pen tip in which the lead emerges outwards. As a "shell portion" corresponding to that portion of the pen tip is referred to, in which the pin shell protrudes outward.

The sharpener here according to the invention comprises a contour tool for introducing a shoulder into the pen tip, which recesses against a circular cone-shaped envelope surface of the pen tip, as is produced by the peeling blade, which thus forms a concave contour with respect to the circular cone-shaped envelope surface. In this case, the contour tool is arranged with respect to the pin guide channel that it introduces the paragraph in the transition between the mine section and the shell portion of the pen tip.

By the contour tool paragraph is thus introduced exactly in the region of the pen tip in which is located in a pen tip formed by a conventional pen nib uneven edge of the mantle. This edge of the jacket material is made uniform by the contouring tool provided according to the invention, i. smoothed and brought into a rotationally symmetrical shape. As a result, on the one hand the appearance of the thus sharpened pin is improved. The sharpener according to the invention is thereby advantageously used for the tips of pens and pens. On the other hand, in the case of cosmetic and pharmaceutical sticks, the smoothed edge of the casing additionally virtually eliminates the risk of skin injury or skin irritation with continued use of the non-sharpened stick.

The contour tool is preferably designed to form in the pen tip as a paragraph a step-shaped contour with a near-acute wall portion and a sharp edge remote from the distal wall portion, the near-peak wall portion is approximately cylindrical, and thus approximately parallel to the pin axis. The tip-remote wall area, however, is preferably generated in such a way that it is at least predominantly aligned approximately radially to the pin axis. As "sharp-edged" here a transition is referred to, whose radius is small compared to the width of the adjacent wall portions of the paragraph. To the apex of the pen tip of the near-peak wall area expediently extends to the outer periphery of the pen tip. He thus goes here preferably continuously (without renewed stage) in the circular cone-shaped wall portion of the pen tip.

Preferably, the heel is introduced by the contour tool in the pen tip, that the pin surface is formed in the near-end wall portion exclusively of the mine. In other words, the contour tool is designed and arranged in the pin guide channel in such a way that it causes material removal all the way to the mine, and optionally into it, in the entire region of the wall close to the tip. By contrast, the tip-remote wall region of the shoulder is preferably inserted into the pen tip by the contour tool to be correspondingly formed and to be arranged in the pin guide channel such that this wall region is formed at least predominantly by the jacket. In other words, the step-shaped shoulder is preferably introduced by the contour tool into the pen tip in such a way that the dividing line between the refill material and the sheath material, ie the sheath edge, runs essentially along the transition between the two wall regions of the shoulder.

In a preferred embodiment of the sharpener, the contour tool comprises a processing edge for the removal of casing material and optionally also lead material. In this case, the machining edge is preferably oriented substantially radially, ie perpendicular to the axis of the pin guide channel, at least in an inner section. As a result, the influence of a relative to the axis of the pin guide channel eccentric storage of the pin lead is minimized to the shape of the jacket edge. This influence is completely prevented if the machining edge is aligned at least in an inner section exactly perpendicular to the axis of the pin guide channel. However, it has been shown that a sufficiently smooth jacket edge can also be achieved with a contour tool which has a machining edge which is set slightly opposite to the radial direction can. Therefore, a "machining edge" is also referred to as "essentially radial", the orientation of which deviates slightly from the radial direction, in particular forms an angle of attack (off-center) with the axis of the pin guide channel which exceeds 80 °, preferably> 85 °. In this case, the tip-distant wall portion of the paragraph formed by the contour tool has a slight conicity.

Deviating from this, however, it is also conceivable that the machining edge of the contour tool is set slightly against the insertion direction of the pin, at least in an inner region, so that the (off-peak) angle of attack formed between the machining edge and the axis of the pin guide channel slightly exceeds 90 °. In this case, the contour tool forms a shoulder in the pen tip, wherein the sheath edge lies in a receding towards the pin end groove.

In a preferred embodiment of the sharpener, the contour tool is designed in the manner of a knife, turning tool or turning iron. In this case, the machining edge forms a main cutting edge for peeling off the mantle material. In an expedient development, the contour tool has, in addition to the processing edge forming the main cutting edge, on an inner edge a secondary cutting edge which is substantially parallel to the axis of the pencil guide channel. Preferably, however, the secondary cutting edge is not aligned exactly parallel to the axis of the pin guide channel, but includes a (small) clearance angle with the axis of the pin guide channel, of e.g. 2 ° - 5 °.

In an alternative embodiment, the contour tool is designed in the manner of a file. The processing edge forms a rasp in this case.

In preferred dimensioning, the machining edge, viewed from the apex of the pen tip, is arranged at an axial height which corresponds to approximately one third of the total length of the pointed cone. Between the processing edge and the base of the pointed cone is in this case about twice as large Distance formed as between the processing edge and the apex of the pointed cone.

Preferably, the processing edge has a concave profile, in particular either in the form of an arc or a polygon. In the former case, the contour tool cuts a shoulder whose tip-distant wall section is convexly curved. In the latter case, the contour tool cuts a shoulder with cross-sectionally straight, angled wall sections, in particular a radial wall section with the outside bevel.

In manufacturing technology particularly favorable embodiment, the contour tool is arranged on the peeling blade in the radial direction opposite side of the pin guide channel.

In an alternative embodiment, the contour tool is arranged on the peeling blade in the radial direction facing side of the pin guide channel. The contour tool can in this case either be formed by a separate part of the paring knife, which is preferably arranged under the paring knife, or be integrally formed on the paring knife, in particular in one piece. The contour tool can be formed in particular by a deflection of the peeling knife. Further, instead of a single peeling blade, two staggered peeling blades may be provided, one of which cuts out the shell portion and the other cuts out the lead portion of the pen tip. The contour tool is formed in this case at one of the mutually facing ends of the two peeling blades.

Preferably, the contour tool is made of stainless steel.

In addition to the paring knife and the contour tool, the sharpener in a preferred embodiment further comprises a blade, in particular of steel or plastic, for rounding off the apex of the pen tip. In this embodiment, the sharpener is particularly suitable for sharpening cosmetic and pharmaceutical sticks. The Fassonmesser is in Appropriate design around a separate from both the paring knife and the contour tool part. It may deviate, but also be formed integrally with the paring knife and / or the contour tool.

Fig. 1

in perspektivischer Schnittdarstellung einen Spitzer in einer ersten Ausführungsform, mit einem Spitzerkörper, einem Schälmesser zum Ausschälen einer konischen Stiftspitze sowie einem Konturwerkzeug zum Einbringen eines Absatzes in die Stiftspitze,

Fig. 2

in schematischer Darstellung das Konturwerkzeug des Spitzers gemäß Fig. 1, zusammen mit dem längsgeschnitten dargestellten Stift,

Fig. 3

in Darstellung gemäß Fig. 1 den Spitzer in einer zweiten Ausführungsform,

Fig. 4

in schematischer Darstellung einen ausschnitthaft dargestellten Längsschnitt durch den Spitzer gemäß Fig. 3,

Fig. 5

in Darstellung gemäß Fig. 1 den Spitzer in einer dritten Ausführungsform, mit einem verkürzten Schälmesser, das einstückig mit dem Konturwerkzeug ausgebildet ist, und einem zusätzlichen Fassonmesser zum Abrunden der Stiftspitze,

Fig. 6

in Draufsicht das Schälmesser des Spitzers gemäß Fig. 5,

Fig. 7

in Darstellung gemäß Fig. 2 das Konturwerkzeug und das Fassonmesser gemäß Fig. 5 sowie den hierdurch bearbeiteten Stift,

Fig. 8

in perspektivischer Ansicht das Konturwerkzeug einer vierten Ausführungsform des Spitzers, und

Fig. 9

in einem horizontalen Längsschnitt den Spitzer in der vierten Ausführungsform mit eingesetztem Konturwerkzeug.

Einander entsprechende Teile und Größen sind in allen Figuren stets mit den gleichen Bezugszeichen versehen.Embodiments of the invention will be explained in more detail with reference to a drawing. Show:

Fig. 1

in a perspective sectional view of a sharpener in a first embodiment, with a sharpener body, a peeling knife for peeling a conical pin tip and a contour tool for introducing a paragraph in the pen tip,

Fig. 2

in a schematic representation of the contour tool of the sharpener according to Fig. 1 , together with the pencil cut longitudinally,

Fig. 3

in illustration according to Fig. 1 the sharpener in a second embodiment,

Fig. 4

in a schematic representation of a sectioned longitudinal section through the sharpener according to Fig. 3 .

Fig. 5

in illustration according to Fig. 1 the sharpener in a third embodiment, with a shortened peeling blade, which is formed integrally with the contour tool, and an additional Fassonmesser for rounding off the pen tip,

Fig. 6

in plan view the paring knife of the sharpener according to Fig. 5 .

Fig. 7

in illustration according to Fig. 2 the contour tool and the diameter blade according to Fig. 5 as well as the thus processed pin,

Fig. 8

in perspective view of the contour tool of a fourth embodiment of the sharpener, and

Fig. 9

in a horizontal longitudinal section of the sharpener in the fourth embodiment with inserted contour tool.

Corresponding parts and sizes are always provided with the same reference numerals in all figures.

Fig. 1 shows in section a first embodiment of a sharpener 1, in which a (uncut shown) pin 2 is inserted as intended for sharpening. The pin 2 is in particular a cosmetic pencil.

The pin 2 comprises a mine 3, which is enveloped by a substantially cylindrical pin shell 4 made of wood. At one end 5 of the pin 2 is already sharpened to a substantially circular conical pin tip 6. The pen tip 6 is essentially subdivided into a front lead portion 7, and a rear shell portion 8. At the beginning also called edge of the shell transition between mine section 7 and shell section 8, ie at the exit point of the mine 3 from the pin shell 4, is in the pen tip. 6 a paragraph 9 introduced. The paragraph 9 jumps against a dashed line indicated, circular cone-shaped envelope surface 10 of the pen tip 6 in the radially inward direction.

The sharpener 1 comprises a sharpener body 20, a paring knife 21, which is fastened with a screw 22 to the sharpener body 20, and a contour tool 23 for inserting the heel 9.

The sharpener body 20, which is here made of plastic by way of example, has a round pin insertion opening 25 on a front side 24 (in the representation on the right). In the interior of the sharpener body 20 is followed by a bore, which forms a pin guide channel 26 following the pin insertion opening 25. The pin guide channel 26 comprises a first, the pin insertion opening 25 facing cylindrical channel portion 27, and a second, adjacent to this circular cone-shaped channel portion. This circular-cone-shaped channel section is referred to below as a pointed cone 28. The pointed cone 28 has a base diameter D which slightly exceeds the diameter of the pin 2.

At an upper side 30 adjoining the front side 24, the sharpener body 20 has an oblique surface 31 which is aligned approximately tangentially to the pointed cone 28. Along the line of contact of the inclined surface 31 with the pointed cone 28 is the lateral surface of the pointed cone 28 through a continuous elongated opening to the outside of the sharpener body 20 through open. This opening is used for ejection for peeled chips of the pin jacket 4 and the mine 3 and is hereinafter referred to as Spanauswurfschlitz 33 is.

On the inclined surface 31 a stepped stepped blade holder 34 is further introduced, in which the paring knife 21 rests. A cutting edge 35 of the peeling knife 21 formed along its longitudinal edge protrudes so far into the chip ejection slot 33 that, when the pin 2 is rotated in the pin guide channel 26, it peels off part of the casing and lead material to form the pen tip 6.

In the area of a bottom 36 opposite the top 30, a tool holder 37 is inserted into the sharpener body 20 in which the contour tool 23 is fastened. The contour tool 23 is in this case pressed into the tool holder 37 after production of the sharpener body 20. Alternatively, the contour tool 23 is already encapsulated with the material of the sharpener body 20 during the production of the sharpener body 20.

The contour tool 23 is here designed as a narrow paring knife approximately in the manner of a turning tool (or: turning iron). The contour tool 23 projects radially further into the pointed cone 28 than the cutting edge 35 of the peeling blade 21. When the pin 2 is rotated, the shoulder 9 is inserted into the pin tip 6 with the aid of the contour tool 23.

Seen in the longitudinal direction of the pin guide channel 26, the contour tool 23 is arranged at the transition between the mine section 7 and the jacket section 8, so that the shoulder 9 is introduced into the pin tip 6 in precisely this area.

In the front region of the pointed cone 28, the sharpener body 20 is designed to be open toward the underside 36, so that this region forms a further chip ejection opening 38, which serves as an outlet opening for the chips peeled off with the aid of the contour tool 23.

gilt. Damit das Konturwerkzeug 23 zumindest überwiegend Mantelmaterial abträgt, ist das Konturwerkzeug 23 in einem den Abstand A geringfügig überschreitenden Abstand zum Scheitel 40 angeordnet.In Fig. 2 the contouring tool 23, as well as a part of the pen tip 6 and the pointed cone 28 are shown enlarged again, wherein the contour tool 23 and the pointed cone 28 for the sake of clarity offset from the pen tip 6 are shown. From this representation, it can be seen that for a given lead radius r and given half cone opening angle α, the jacket edge lies approximately at a distance A from the apex 40, ie the common cone tip of the pointed cone 28 and the pen tip 6, for which distance A the relationship $$A=\frac{r}{\tan \left(\alpha \right)}$$

applies. In order for the contour tool 23 to remove at least predominantly casing material, the contour tool 23 is arranged at a distance to the apex 40 which extends slightly beyond the distance A.

Fig. 2 illustrates further that the cut by the contour tool 23 paragraph 9 has a stepped contour, with a near-peak wall portion 41 of this contour is approximately parallel to the axis 42 of the pin 2, while an adjoining top off wall portion 43 extends predominantly radially to the axis 42, but on the outside is chamfered. In the radial direction, the shoulder 9 protrudes sufficiently towards the axle 42 that the contour tool 23 removes the pin surface in the near-to-wall area 41 up to the lead material. The near-peak wall portion 41 of the thus formed paragraph 9 is thus formed by the lead material. By contrast, in the tip-distant wall region 43, the pin surface is formed at least predominantly from the jacket material.

To peel off the shoulder 9, the contour tool 23 has a machining edge formed as a main cutting edge 44, which faces the insertion opening 25 of the pin guide channel 26. The main cutting edge 44 closes with the axis 45 of the pin guide channel 26 - as in Fig. 2 indicated by an axis-parallel line 45 '- an angle β of 90 ° ± 2 °. The main cutting edge 44 is therefore oriented substantially radially to the axis 45.

Furthermore, the contour tool 23 has at its inner edge to the main cutting edge 44 approximately at right angles arranged secondary cutting edge 46, which serves to cut off a chip removed by the main cutting edge 44 laterally. The secondary cutting edge 46 is not aligned exactly parallel to the axis, but is slightly exposed to the apex 40 to the outside, so that they do not scrap over the entire length of the mine 3.

In the Fig. 3 and 4 the sharpener 1 is shown in a second embodiment. This essentially corresponds to the first embodiment. In contrast, however, the contour tool 23 is arranged in the radial direction on the same side as the paring knife 21. Aus Fig. 4 It can be seen that the contouring tool 23 is in turn inserted in an exact fit analogous to the first embodiment in a tool holder 50, which is here, however, arranged below the peeling blade 21.

In the Fig. 5 to 7 the sharpener 1 is shown in a third embodiment. The third embodiment substantially corresponds to the first two embodiments, but here the paring knife 21 is shorter in comparison. Viewed in the longitudinal direction, it only extends approximately to the paragraph 9 intended to be introduced. The contour tool 23 is formed integrally with the paring knife 21 in this embodiment by the tip end of the paring knife 21 is bent in the direction of the axis 45. Furthermore, in contrast to the two other embodiments, here a made of plastic Fassonmesser 51 is integrally formed on a rear side 52 opposite to the front side 24 on the sharpener body 20 in the interior of the sharpener body 20. The blade diameter 51 has an arcuate cutting edge 53 facing the pointed cone 28, which protrudes in the direction of the pen tip 6 in such a way that its lead portion 7 is rounded off by the cutting edge 53 when the pin 2 is rotated.

In Fig. 6 the paring knife 21 is shown in plan view. It can be seen that the contour tool 23 projects slightly beyond the cutting edge 35 of the peeling knife 21 in the manner of a nose.

In Fig. 7 is the contour tool 23 according to Fig. 5 and 6 shown enlarged again. As is clear from this illustration, the main cutting edge 44 of the contouring tool 23 in this embodiment is designed in the form of a concave arc, whereby the tip-distant wall portion 43 of the section cut by this contour tool 23 receives a-though convex-curvature. In its inner end, the main cutting edge 44 again runs approximately radially with respect to the axis 45, so that the wall region 43 machined by this main cutting edge 44 also abuts approximately perpendicularly on the near-pointed wall region 41 of the shoulder 9.

At one in the 8 and 9 illustrated fourth embodiment of the sharpener 1, the contour tool 23 is not realized in the form of a solid metal part, but formed from a bent sheet metal part, in a preferred embodiment in particular - as from Fig. 8 can be seen - greatly simplified has the shape of a letter Ω. The contour tool 23 is held in this embodiment with two end legs 54 positively in complementarily shaped slots 55 of the sharpener body 20 so that it protrudes into the pointed cone 28 with an approximately U-shaped bent portion 56.

The realization of the contour tool 23 as a sheet metal part is on the one hand for reasons of simple and inexpensive manufacturability advantageous. On the other hand, this embodiment also favors chip removal due to the very narrow contour tool 23.

In a further embodiment of the sharpener according to the invention, which is not explicitly shown, the contour tool (solid or sheet metal part) can be reversibly inserted and removed in the pointed cone, so that the shoulder cutting effect can be "turned on and off" at will. For this purpose, the contour tool is preferably guided, foldable, rotatable or displaceable on the sharpener body, or optionally removable completely from the sharpener body. The individual features of the sharpener 1 described in each case in connection with the exemplary embodiments can be combined as desired within the scope of the invention.

LIST OF REFERENCE NUMBERS

1

Sharpener

2

pen

3

mine

4

pen sheath

5

The End

6

pen tip

7

mine section

8th

shell section

9

paragraph

10

envelope

20

sharpener body

21

paring knife

22

screw

23

contour tool

24

front

25

pin insertion

26

Pin guide channel

27

channel section

28

pointed cone

30

top

31

sloping surface

33

Chip ejection slot

34

knife receiver

35

cutting edge

36

bottom

37

tool holder

38

Chip ejection opening

40

vertex

41

wall area

42

Axis (of the pen)

43

wall area

44

main cutting edge

45

Axis (pin guide channel)

45 '

axis-parallel line

46

Besides cutting

50

tool holder

51

Fasson knife

52

back

53

cutting edge

54

end leg

55

slot

56

midsection

A

distance

D

Base diameter

r

mine radius

α

half cone opening angle

β

paragraph angle

Claims (11)

Sharpener (1) for sharpening a pin (2) comprising a lead (3) and a pin sheath (4) surrounding it, in particular a cosmetic pencil, - having a sharpener body (20) into which a pin guide channel (26) is inserted, the pin guide channel (26) comprising a circular cone-shaped channel portion (28) and opening on the outside of the sharpener body (20) in a pin insertion opening (25), - With an approximately tangential to the lateral surface of the circular cone-shaped channel portion (28) employed peeling knife (21) for stripping a front mine section (7) and a rear shell section (8) comprehensive pen nib (6), and - With a contour tool (23) for introducing a shoulder (9) in the pen tip (6) which is opposite a circular conical envelope surface (10) of the pen tip (6) springs back, wherein the contour tool (23) arranged with respect to the pin guide channel (26) in that it introduces the shoulder (9) into the transition between the mine section (7) and the skirt section (8) of the pen point (6). Sharpener (1) according to claim 1,
wherein the contour tool (23) comprises a processing edge (44) for removing casing material and optionally also refuse material, wherein the processing edge (44) extends at least in an inner portion substantially radially to the axis (45) of the pin guide channel (26). Sharpener (1) according to claim 2,
wherein the machining edge forms a main cutting edge (44) for peeling off the cladding material. Sharpener (1) according to claim 3,
wherein the contour tool (23) at an inner edge to the axis (45) of the pin guide channel (26) substantially parallel secondary cutting edge (46) Sharpener (1) according to claim 2,
wherein the processing edge (44) is formed as a rasp. Sharpener (1) according to one of claims 2 to 5,
wherein the processing edge (44), viewed from a vertex (40) of the circular cone-shaped channel portion (28), is arranged approximately at an axial height of one third of the length of this channel portion (28). Sharpener (1) according to one of claims 2 to 6,
wherein the processing edge (44) has a concave shape. Sharpener (1) according to one of claims 1 to 7,
wherein the contour tool (23) is arranged on the side of the pin guide channel (26) facing the peeling blade (21) in the radial direction. Sharpener (1) according to claim 8,
wherein the contour tool (23) is formed integrally with the peeling blade (21). Sharpener (1) according to one of claims 1 to 9,
wherein the contour tool (23) is arranged on the side of the pin guide channel (26) remote from the peeling blade (21) in the radial direction. Sharpener (1) according to one of claims 1 to 10,
with a Fassonmesser (51), in particular made of steel or plastic, to round off the pen tip (6).

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