EP2303524B1 - Lower cutter for the shaving head of a dry shaver - Google Patents

Lower cutter for the shaving head of a dry shaver Download PDF

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Publication number
EP2303524B1
EP2303524B1 EP09757181.4A EP09757181A EP2303524B1 EP 2303524 B1 EP2303524 B1 EP 2303524B1 EP 09757181 A EP09757181 A EP 09757181A EP 2303524 B1 EP2303524 B1 EP 2303524B1
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EP
European Patent Office
Prior art keywords
blades
blade
lower cutter
dry shaver
width
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EP09757181.4A
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German (de)
French (fr)
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EP2303524A1 (en
Inventor
Reinhold Eichhorn
Andreas Hartmann
Peter Junk
Joachim Krauss
Michael Odemer
Andreas Peter
Thorsten Pohl
Markus Sabisch
Tobias Schwarz
Thomas Verstege
Jürgen Wolf
Christoph Zegula
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Braun GmbH
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Braun GmbH
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Publication of EP2303524A1 publication Critical patent/EP2303524A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B19/00—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers
    • B26B19/02—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers of the reciprocating-cutter type
    • B26B19/04—Cutting heads therefor; Cutters therefor; Securing equipment thereof
    • B26B19/044—Manufacture and assembly of cutter blocks

Definitions

  • the invention relates to a lower blade for a dry shaver, according to the preamble of claim 1.
  • Such a lower blade is for example from the DE-A 10 2005 009 264 A1 known.
  • the strip-shaped blades of this lower blade taper monotonously towards the middle.
  • a lower knife is also from the US 7,022,195 B2 known, this lower blade is composed of a plurality of strip-shaped blade elements which have a constant width or a width increasing towards the center.
  • Such lower blades are driven oscillating within the shaving head of a dry shaver and pressed against the perforated foil and are exposed to a complex load during shaving.
  • the lower blade designs according to the known type have the disadvantage that they generate very high friction losses due to viscous friction between the perforated foil and the involved friction surfaces of the lower blade. This leads to a high energy consumption and also to a user unpleasant heating of the shaving parts as well as premature wear. Due to the non-uniform mechanical stress distribution over the course of the individual blades, these bulge unevenly over the blade length due to the forces which occur when the shaving head is pressed against the skin of the user. This leads to partial loss of direct contact between lower blade and perforated film, which cut into the hole already threaded hair is not cut, but only fed, resulting in a painful scribing of the Hair may result from the skin. In addition, the perforated foil can be damaged by the uneven bulging of the blades.
  • the inventive solution a uniform material loading over the entire course of the individual blades is achieved, whereby the permanent uniform contact between the perforated film and the bottom blade is ensured even under heavy loads.
  • This also makes it possible that in the actual cutting area, the blades can be kept narrow without loss of stability, which can reduce the viscous friction between the perforated film and lower blade. As a result, the material used is better utilized.
  • the invention provides that the tapering of the strip width of the blades takes place continuously, which promotes a uniform load distribution along the blade.
  • the taper of the strip width is preferably designed arcuate.
  • the blades are preferably formed symmetrically to the centerline of the strips and preferably have acute-angled cutting edges to reduce the cutting forces encountered during shaving.
  • the in Fig. 1 shown dry shaver consists of a housing 1, which serves, inter alia, the inclusion of a drawing not shown electric motor and, where appropriate, also not graphically illustrated accumulators for energy storage and is provided with an on / off switch 2.
  • a housing 1 which serves, inter alia, the inclusion of a drawing not shown electric motor and, where appropriate, also not graphically illustrated accumulators for energy storage and is provided with an on / off switch 2.
  • an oscillating driven drive element 3 is led out of the housing 1.
  • the lower blade 4 are locked by appropriate / suitable per se known coupling means with the drive element 3.
  • the two lower blades 4 arranged parallel to one another can then be driven in an oscillating manner along their longitudinal extent, that is to say in accordance with the double arrow 5.
  • the lower blades 4 are at least partially surrounded in each case by one of the two outer blades, which are each formed as a perforated foil 6. They are mounted in a removable frame 7, which is latched to the housing 1.
  • the perforated foils 6 are perforated flat with passage openings which can be embodied as holes and / or slots and through which the hair to be shaved enters the shaving head during the shaving process. Due to the cutting edges formed on both the film passage holes and the lower blades 4 and the movement of the lower blades 4 relative to the hole foils 6, the hairs entering the shaving head are sheared between the respective shearing edges.
  • FIG. 2 shown lower blade 4 has a plurality of U-shaped mutually parallel blades 8, which extend in the form of strips between the two edge regions 10 and 9.
  • Each of the two edge regions 9 and 10 has at its front or rear end in each case a fastening portion 11 for connection to a carrier element not shown in detail, which ultimately serves to connect the lower blade 4 with the drive element 3 of the dry shaver.
  • the longitudinal extent of each edge region 9 or 10 between its two attachment portions 11 corresponds to the direction of oscillation according to the double arrow 5.
  • the blades 8 according to the embodiment shown here are perpendicular to the longitudinal extent of the edge regions 9, 10.
  • the width of the blades 8 and the pitch T of Blades of the lower blade 4 are measured parallel to the longitudinal extent of the edge regions.
  • the width of the strip-shaped blades 8 is not constant over the length L1, but tapers, starting from the edge portion 9 to the zenith Z of the bow to increase from there to the edge portion 10 out again. This becomes particularly apparent from the illustration Fig. 3 clear.
  • Fig. 3 shows the development of a single blade 8, which is formed symmetrically both with respect to the center line M and with respect to the zenith Z.
  • the edge regions 9, 10 are in Fig. 3 represented by the width of the pitch T, which is about 1 mm.
  • the total length L1 of the blade 8 is approximately 11.5 mm.
  • the entire tapered region of the blade 8 bounded on both sides by the approach of the inner radii R1 at the end regions 9, 10 extends over a length L2 of about 8.9 mm.
  • the blade 8 tapers by means of a concave inner radius R1, which is about 0.2 mm, to the width B1, which is about 0.58 mm. This is followed by a convex outer radius R2 of about 33 mm. This gives the blade in this area a convex outer contour along its longitudinal extent. At the inside end of the radius R2, the blade merges with a concave inner radius R3 of about 3.5 mm into the parallel middle part. This part has a width B2 of 0.32 mm and a length L3 of about 3.1 mm.
  • the notch effect is eliminated, which is due to the bending load due to the cutting forces occurring to blade fractures could occur in the connecting region between the edge regions 9, 10 and the blades 8 itself. Due to the outer radius R2, the stress distribution is evened out in the region of the greatest bending / torsional load and stress peaks are avoided. By the inner radius R3, the notch effect between R2 and the parallel middle part L3 is eliminated.
  • Fig. 4 shows a view of a curved blade member 8, which was generated by corresponding U-shaped bending of an originally flat output lower blade 4.
  • Der Blade 8 ist in der Figur 1 classroom.
  • the flat starting lower blade 4 is produced in particular by an etching-technical process from a strip-shaped starting body made of metal, into which the slots lying between the individual blades 8 are etched. This starting body is then then bent in a U-shape, so that a lower blade, as it Fig. 2 shows, arises. Due to the etching technology production arises in the region of the two opposite cutting edges 12, 13 of each blade 8, an undercut, as in the FIGS. 5 and 6 is clearly shown. This undercut 14 is located after the U-shaped bending on the inside of the sheet. Again Fig. 4 can be removed, the material thickness of the starting sheet D is about 0.3 mm.
  • Fig. 6 clearly shown undercut under each of the two cutting edges 12, 13 extends along a radius R4 of about 0.3 mm and generates at the cutting edges 12, 13 a cutting edge angle W of about 50 °.

Description

Die Erfindung betrifft ein Untermesser für einen Trockenrasierapparat, gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a lower blade for a dry shaver, according to the preamble of claim 1.

Ein solches Untermesser ist beispielsweise aus der DE-A 10 2005 009 264 A1 bekannt. Die streifenförmigen Klingen dieses Untermessers verjüngen sich monoton zur Mitte hin.Such a lower blade is for example from the DE-A 10 2005 009 264 A1 known. The strip-shaped blades of this lower blade taper monotonously towards the middle.

Ein Untermesser ist auch aus der US 7,022,195 B2 bekannt, wobei dieses Untermesser sich aus einer Vielzahl von streifenförmigen Klingenelementen zusammensetzt, die über eine konstante Breite oder über eine zur Mitte hin zunehmende Breite verfügen.A lower knife is also from the US 7,022,195 B2 known, this lower blade is composed of a plurality of strip-shaped blade elements which have a constant width or a width increasing towards the center.

Derartige Untermesser befinden sich innerhalb des Scherkopfes eines Trockenrasierapparates oszillierend angetrieben und angepreßt an die Lochfolie und sind während des Rasiervorganges einer komplexen Belastung ausgesetzt.Such lower blades are driven oscillating within the shaving head of a dry shaver and pressed against the perforated foil and are exposed to a complex load during shaving.

So werden sie einerseits durch den Anpreßdruck beaufschlagt, mit welchem der Benutzer den Rasierapparat gegen die Haut preßt, wodurch die streifenförmigen Klingen einer Biegebelastung um eine Achse ausgesetzt sind, die der Breitenerstreckung der Klingen entspricht. Während des Abscherens eines Haares tritt zusätzlich noch eine mechanische Belastung durch die Schnittkräfte auf, die sich im Zenit als Biegebelastung darstellt und nach außen hin zu einer komplexen Belastung aus zweiachsiger Biegung und Torsion wird. Eine weitere Belastung entsteht durch die Reibkraft zwischen der Lochfolie und dem Untermesser selbst.Thus, on the one hand they are acted upon by the contact pressure with which the user presses the shaver against the skin, whereby the strip-shaped blades are subjected to a bending load about an axis corresponding to the widthwise extension of the blades. In addition, during the shearing off of a hair, a mechanical load occurs due to the cutting forces, which in the zenith represents a bending load and becomes a complex load of biaxial bending and torsion on the outside. Another burden arises due to the frictional force between the perforated foil and the lower blade itself.

Die Untermesserkonstruktionen gemäß dem bekannten Typ weisen den Nachteil auf, daß sie sehr hohe Reibleistungen durch viskose Reibung zwischen Lochfolie und den beteiligten Reibflächen des Untermessers generieren. Dies führt zu einem hohen Energieverbrauch und darüber hinaus zu einer für den Benutzer unangenehmen Erhitzung der Scherteile sowie zu einem vorzeitigen Verschleiß. Aufgrund der ungleichförmigen mechanischen Spannungsverteilung über den Verlauf der einzelnen Klingen beulen sich diese bedingt durch die Kräfte, welche beim Anpressen des Scherkopfes an die Haut des Benutzers auftreten, ungleichmäßig über die Klingenlänge aus. Dies führt zu partiellem Verlust der direkten Anlage zwischen Untermesser und Lochfolie, wodurch in die Lochfolie bereits eingefädelte Haare nicht geschnitten, sondern lediglich eingezogen werden, was zu einem schmerzhaften Anreißen des Haares aus der Haut führen kann. Außerdem kann durch das ungleichmäßige Ausbeulen der Klingen die Lochfolie beschädigt werden.The lower blade designs according to the known type have the disadvantage that they generate very high friction losses due to viscous friction between the perforated foil and the involved friction surfaces of the lower blade. This leads to a high energy consumption and also to a user unpleasant heating of the shaving parts as well as premature wear. Due to the non-uniform mechanical stress distribution over the course of the individual blades, these bulge unevenly over the blade length due to the forces which occur when the shaving head is pressed against the skin of the user. This leads to partial loss of direct contact between lower blade and perforated film, which cut into the hole already threaded hair is not cut, but only fed, resulting in a painful scribing of the Hair may result from the skin. In addition, the perforated foil can be damaged by the uneven bulging of the blades.

Es ist daher die Aufgabe der Erfindung, ein Untermesser der genannten Art auf kostengünstige Weise in Bezug auf seine Leistungsfähigkeit und Standfestigkeit zu verbessern. Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruches 1 gelöst.It is therefore an object of the invention to improve a lower blade of the type mentioned in a cost effective manner in terms of its performance and stability. This object is achieved by the characterizing features of claim 1.

Durch die erfindungsgemäße Lösung wird eine gleichmäßige Materialbelastung über den gesamten Verlauf der einzelnen Klingen erzielt, wodurch die permanente gleichmäßige Anlage zwischen der Lochfolie und dem Untermesser auch unter starken Belastungen sichergestellt ist. Auch wird dadurch ermöglicht, daß im eigentlichen Schneidbereich die Klingen ohne Stabilitätsverlust schmal gehalten werden können, wodurch sich die viskose Reibung zwischen Lochfolie und Untermesser verringern läßt. Dadurch wird auch das eingesetzte Material besser ausgenutzt.The inventive solution a uniform material loading over the entire course of the individual blades is achieved, whereby the permanent uniform contact between the perforated film and the bottom blade is ensured even under heavy loads. This also makes it possible that in the actual cutting area, the blades can be kept narrow without loss of stability, which can reduce the viscous friction between the perforated film and lower blade. As a result, the material used is better utilized.

Die Erfindung sieht dabei vor, daß die Verjüngung der Streifenbreite der Klingen stufenlos erfolgt, was eine gleichmäßige Belastungsverteilung entlang der Klinge fördert. Insbesondere ist die Verjüngung der Streifenbreite vorzugsweise bogenförmig ausgeführt.The invention provides that the tapering of the strip width of the blades takes place continuously, which promotes a uniform load distribution along the blade. In particular, the taper of the strip width is preferably designed arcuate.

Erfolgt die Verjüngung der Streifenbreite der Klingen in Form mindestens zweier Übergangsradien, so läßt sich die Sicherheit gegen ein Brechen der Klingen im Bereich des Überganges zwischen den Randbereichen und der Klinge selbst verringern. Durch die entsprechende Ausgestaltung der Übergangsradien läßt sich nämlich die Wirkung der Kerbe in diesem Übergangsbereich nahezu eliminieren.If the taper of the strip width of the blades in the form of at least two transition radii, so can the security against breakage of the blades in the region of the transition between the edge regions and the blade itself reduce. By the corresponding design of the transition radii namely the effect of the notch in this transition region can be almost eliminated.

Die Klingen werden bevorzugt symmetrisch zur Mittellinie der Streifen ausgebildet und weisen zur Reduzierung der beim Rasieren auftretenden Schneidkräfte vorzugsweise spitzwinkelige Schneidkanten auf.The blades are preferably formed symmetrically to the centerline of the strips and preferably have acute-angled cutting edges to reduce the cutting forces encountered during shaving.

Weitere Ziele, Merkmale, Vorteile und Anwendungsmöglichkeiten der vorliegenden Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispiels. Hierzu zeigt:

Fig. 1
den prinzipiellen Aufbau des Schersystems eines Trockenrasierapparates,
Fig. 2
die perspektivische Darstellung eines erfindungsgemäßen Untermessers,
Fig. 3
die Abwicklung einer einzigen Klinge gemäß des erfindungsgemäßen Untermessers,
Fig. 4
die Vorderansicht auf ein einzelnes Klingenelement,
Fig. 5
den Schnitt durch ein solches Klingenelement und
Fig. 6
eine vergrößerte Detailansicht aus Fig. 5.
Other objects, features, advantages and applications of the present invention will become apparent from the following description of an embodiment. This shows:
Fig. 1
the basic structure of the shearing system of a dry shaver,
Fig. 2
the perspective view of a lower blade according to the invention,
Fig. 3
the development of a single blade according to the lower knife according to the invention,
Fig. 4
the front view of a single blade element,
Fig. 5
the section through such a blade element and
Fig. 6
an enlarged detail view Fig. 5 ,

Der in Fig. 1 dargestellte Trockenrasierapparat besteht aus einem Gehäuse 1, das unter anderem der Aufnahme eines zeichnerisch nicht dargestellten Elektromotors und gegebenenfalls von ebenfalls zeichnerisch nicht dargestellten Akkumulatoren zur Energiespeicherung dient und mit einem Ein-/Aus-Schalter 2 versehen ist. An der oberen Stirnseite des Trockenrasierapparates ist ein oszillierend angetriebenes Antriebselement 3 aus dem Gehäuse 1 herausgeführt. Die Untermesser 4 sind über entsprechende/geeignete an sich bekannte Kupplungsmittel mit dem Antriebselement 3 verrastet. Hierdurch können dann die beiden parallel zueinander angeordneten Untermesser 4 in oszillierender Weise entlang deren Längserstreckung, also entsprechend dem Doppelpfeil 5 angetrieben werden.The in Fig. 1 shown dry shaver consists of a housing 1, which serves, inter alia, the inclusion of a drawing not shown electric motor and, where appropriate, also not graphically illustrated accumulators for energy storage and is provided with an on / off switch 2. At the upper end face of the dry shaver, an oscillating driven drive element 3 is led out of the housing 1. The lower blade 4 are locked by appropriate / suitable per se known coupling means with the drive element 3. As a result, the two lower blades 4 arranged parallel to one another can then be driven in an oscillating manner along their longitudinal extent, that is to say in accordance with the double arrow 5.

Die Untermesser 4 sind zumindest teilweise jeweils von einem der beiden Obermesser umgeben, welche jeweils als Lochfolie 6 ausgebildet sind. Sie sind in einem Wechselrahmen 7 befestigt, welcher mit dem Gehäuse 1 verrastbar ist. Die Lochfolien 6 sind flächig mit Durchgangsöffnungen perforiert, die als Löcher und/oder Schlitze ausgeführt sein können und durch welche während des Rasiervorganges die zu rasierenden Haare in den Scherkopf eintreten. Aufgrund der Schneidkanten, die sowohl an den Foliendurchgangslöchern als auch an den Untermessern 4 ausgebildet sind und der Bewegung der Untermesser 4 relativ zu den Lochfolien 6 werden die in den Scherkopf eingetretenen Haare zwischen den entsprechenden Scherkanten abgeschert.The lower blades 4 are at least partially surrounded in each case by one of the two outer blades, which are each formed as a perforated foil 6. They are mounted in a removable frame 7, which is latched to the housing 1. The perforated foils 6 are perforated flat with passage openings which can be embodied as holes and / or slots and through which the hair to be shaved enters the shaving head during the shaving process. Due to the cutting edges formed on both the film passage holes and the lower blades 4 and the movement of the lower blades 4 relative to the hole foils 6, the hairs entering the shaving head are sheared between the respective shearing edges.

Das in Fig. 2 dargestellte erfindungsgemäße Untermesser 4 weist eine Vielzahl von U-förmigen parallel zueinander verlaufenden Klingen 8 auf, die in Form von Streifen zwischen den beiden Randbereichen 10 und 9 verlaufen. Jeder der beiden Randbereiche 9 und 10 weist an seinem vorderen bzw. hinteren Ende jeweils einen Befestigungsabschnitt 11 zur Verbindung mit einem zeichnerisch nicht näher dargestellten Trägerelement auf, welches letztendlich der Verbindung der Untermesser 4 mit dem Antriebselement 3 des Trockenrasierapparates dient. Die Längserstreckung eines jeden Randbereiches 9 bzw. 10 zwischen seinen beiden Befestigungsabschnitten 11 entspricht der Oszillationsrichtung gemäß dem Doppelpfeil 5. Die Klingen 8 verlaufen gemäß dem hier dargestellten Ausführungsbeispiel senkrecht zur Längserstreckung der Randbereiche 9, 10. Die Breite der Klingen 8 sowie die Teilung T der Klingen des Untermessers 4 werden parallel zur Längserstreckung der Randbereiche gemessen.This in Fig. 2 shown lower blade 4 has a plurality of U-shaped mutually parallel blades 8, which extend in the form of strips between the two edge regions 10 and 9. Each of the two edge regions 9 and 10 has at its front or rear end in each case a fastening portion 11 for connection to a carrier element not shown in detail, which ultimately serves to connect the lower blade 4 with the drive element 3 of the dry shaver. The longitudinal extent of each edge region 9 or 10 between its two attachment portions 11 corresponds to the direction of oscillation according to the double arrow 5. The blades 8 according to the embodiment shown here are perpendicular to the longitudinal extent of the edge regions 9, 10. The width of the blades 8 and the pitch T of Blades of the lower blade 4 are measured parallel to the longitudinal extent of the edge regions.

Wie bereits in Fig. 2 zu erkennen und in Fig. 3 noch näher dargestellt, ist die Breite der streifenförmigen Klingen 8 nicht konstant über deren Länge L1, sondern verjüngt sich, beginnend vom Randabschnitt 9 zum Zenit Z des Bogens hin, um von dort aus zum Randbereich 10 hin wieder zuzunehmen. Dies wird besonders aus der Darstellung gemäß Fig. 3 deutlich.As already in Fig. 2 to recognize and in Fig. 3 shown in more detail, the width of the strip-shaped blades 8 is not constant over the length L1, but tapers, starting from the edge portion 9 to the zenith Z of the bow to increase from there to the edge portion 10 out again. This becomes particularly apparent from the illustration Fig. 3 clear.

Fig. 3 zeigt die Abwicklung einer einzelnen Klinge 8, welche sowohl bezüglich der Mittellinie M als auch bezüglich des Zenits Z symmetrisch ausgebildet ist. Die Randbereiche 9, 10 sind in Fig. 3 mit der Breite der Teilung T dargestellt, die etwa 1 mm beträgt. Fig. 3 shows the development of a single blade 8, which is formed symmetrically both with respect to the center line M and with respect to the zenith Z. The edge regions 9, 10 are in Fig. 3 represented by the width of the pitch T, which is about 1 mm.

Die Gesamtlänge L1 der Klinge 8 beträgt in etwa 11,5 mm. Der gesamte verjüngte Bereich der Klinge 8 beidseitig jeweils begrenzt durch den Ansatz der Innenradien R1 an den Endbereichen 9, 10 verläuft über eine Länge L2 von etwa 8,9 mm.The total length L1 of the blade 8 is approximately 11.5 mm. The entire tapered region of the blade 8 bounded on both sides by the approach of the inner radii R1 at the end regions 9, 10 extends over a length L2 of about 8.9 mm.

Ausgehend von den Randbereichen 9, 10 verjüngt sich die Klinge 8 mittels eines konkaven Innenradius R1, der etwa 0,2 mm beträgt, auf die Breite B1, welche etwa 0,58 mm beträgt. Daran schließt sich ein konvexer Außenradius R2 von etwa 33 mm an. Dadurch erhält die Klinge in diesem Bereich eine konvexe Außenkontur entlang ihrer Längserstreckung. Am innenseitigen Ende des Radius R2 geht die Klinge mit einem konkaven Innenradius R3 von etwa 3,5 mm in den parallelen mittleren Teil über. Dieser Teil hat eine Breite B2 von 0,32 mm und eine Länge L3 von etwa 3,1 mm.Starting from the edge regions 9, 10, the blade 8 tapers by means of a concave inner radius R1, which is about 0.2 mm, to the width B1, which is about 0.58 mm. This is followed by a convex outer radius R2 of about 33 mm. This gives the blade in this area a convex outer contour along its longitudinal extent. At the inside end of the radius R2, the blade merges with a concave inner radius R3 of about 3.5 mm into the parallel middle part. This part has a width B2 of 0.32 mm and a length L3 of about 3.1 mm.

Durch die Verjüngung der Klingenbreite mittels des Radius R1 wird die Kerbwirkung eliminiert, welche durch die Biegebelastung aufgrund der auftretenden Schnittkräfte zu Klingenbrüchen im Verbindungsbereich zwischen den Randbereichen 9, 10 und den Klingen 8 selbst auftreten könnten. Durch den Außenradius R2 wird im Bereich der größten Biege-Torsions-Belastung die Spannungsverteilung vergleichmäßigt und Spannungsspitzen vermieden. Durch den Innenradius R3 wird die Kerbwirkung zwischen R2 und dem parallelen mittleren Teil L3 eliminiert.By tapering the blade width by means of the radius R1, the notch effect is eliminated, which is due to the bending load due to the cutting forces occurring to blade fractures could occur in the connecting region between the edge regions 9, 10 and the blades 8 itself. Due to the outer radius R2, the stress distribution is evened out in the region of the greatest bending / torsional load and stress peaks are avoided. By the inner radius R3, the notch effect between R2 and the parallel middle part L3 is eliminated.

Die Querschnittsreduktion der Klingen 8, beginnend von den Randbereichen 9, 10 bis hin zur Zenitachse Z verläuft in etwa gemäß der Abnahme der Biege- und Torsionsmomente, die aus den Schnittkräften und den Reibungskräften resultieren, so daß sich insgesamt eine sehr homogene Spannungsverteilung entlang der Klingenlänge (bzw. im U-förmig gebogenen Endzustand entlang der Klingenhöhe) ergibt. Dies begünstigt eine optimale Materialausnutzung und verhindert unregelmäßige Deformationen.The reduction in cross section of the blades 8, starting from the edge regions 9, 10 up to the zenith axis Z, runs approximately in accordance with the decrease of the bending and torsional moments resulting from the cutting forces and the frictional forces, so that overall a very homogeneous stress distribution along the blade length (or in the U-shaped bent final state along the blade height) results. This promotes optimal material utilization and prevents irregular deformations.

Fig. 4 zeigt eine Ansicht eines gebogenen Klingenelementes 8, welches durch entsprechendes U-förmiges Verbiegen eines ursprünglich ebenen Ausgangsuntermessers 4 erzeugt wurde. Das ebene Ausgangsuntermesser 4 wiederum wird insbesondere durch ein ätztechnisches Verfahren aus einem streifenförmigen Ausgangskörper aus Metall hergestellt, in den die zwischen den einzelnen Klingen 8 liegenden Schlitze eingeätzt werden. Dieser Ausgangskörper wird dann anschließend U-förmig gebogen, so daß ein Untermesser, wie es Fig. 2 zeigt, entsteht. Bedingt durch die Ätztechnische Herstellung entsteht im Bereich der beiden gegenüberliegenden Schneidkanten 12, 13 einer jeden Klinge 8 ein Hinterschnitt, wie er in den Figuren 5 und 6 deutlich dargestellt ist. Dieser Hinterschnitt 14 liegt nach dem U-förmigen Verbiegen auf der Innenseite des Bogens. Wie der Fig. 4 entnehmbar ist, beträgt die Materialstärke des Ausgangsbleches D etwa 0,3 mm. Fig. 4 shows a view of a curved blade member 8, which was generated by corresponding U-shaped bending of an originally flat output lower blade 4. Der Blade 8 ist in der Figur 1 dargestellt. The flat starting lower blade 4, in turn, is produced in particular by an etching-technical process from a strip-shaped starting body made of metal, into which the slots lying between the individual blades 8 are etched. This starting body is then then bent in a U-shape, so that a lower blade, as it Fig. 2 shows, arises. Due to the etching technology production arises in the region of the two opposite cutting edges 12, 13 of each blade 8, an undercut, as in the FIGS. 5 and 6 is clearly shown. This undercut 14 is located after the U-shaped bending on the inside of the sheet. Again Fig. 4 can be removed, the material thickness of the starting sheet D is about 0.3 mm.

Der in Fig. 6 deutlich gezeigte Hinterschnitt unter jeder der beiden Schneidkanten 12, 13 verläuft entlang eines Radius R4 von etwa 0,3 mm und erzeugt an den Schneidkanten 12, 13 einen Schneidkantenwinkel W von etwa 50°.The in Fig. 6 clearly shown undercut under each of the two cutting edges 12, 13 extends along a radius R4 of about 0.3 mm and generates at the cutting edges 12, 13 a cutting edge angle W of about 50 °.

Claims (3)

  1. A lower cutter (4) for an electric dry shaver, wherein the lower cutter (4) has multiple blades (8) having cutting edges (12, 13) spaced apart from one another in the form of strips between two end regions (9,10) and is designed to be essentially U-shaped in cross section, and the width of the strip tapers monotonically from both edge regions (9, 10) towards the middle (Z); wherein the tapering of the strip width takes place continuously; wherein the blades have a parallel middle part (23) within the tapered region (22); characterized in that the blades respectively taper from the edge regions (9, 10) towards the middle (Z) via two concave inner radii (R1, R3) between which a convex outer radius (R2) is provided.
  2. The lower cutter according to claim 1, characterized in that the blades (8) are formed symmetrical to the middle line (M).
  3. The lower cutter according to claim 1, characterized in that the cutting edges (12, 13) of the blades (8) have acute cutting edge angles (W).
EP09757181.4A 2008-06-06 2009-05-20 Lower cutter for the shaving head of a dry shaver Active EP2303524B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008027224A DE102008027224A1 (en) 2008-06-06 2008-06-06 Undercutter for the shaving head of a dry shaver
PCT/EP2009/003600 WO2009146798A1 (en) 2008-06-06 2009-05-20 Lower cutter for the shaving head of a dry shaver

Publications (2)

Publication Number Publication Date
EP2303524A1 EP2303524A1 (en) 2011-04-06
EP2303524B1 true EP2303524B1 (en) 2013-09-11

Family

ID=40957941

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09757181.4A Active EP2303524B1 (en) 2008-06-06 2009-05-20 Lower cutter for the shaving head of a dry shaver

Country Status (6)

Country Link
US (1) US8732961B2 (en)
EP (1) EP2303524B1 (en)
JP (1) JP5373068B2 (en)
CN (1) CN102056716B (en)
DE (1) DE102008027224A1 (en)
WO (1) WO2009146798A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005036383A1 (en) * 2005-07-29 2007-02-01 Braun Gmbh Shaving head for an electric shaver comprises a blade with an outer delimiting section facing an upper blade which is raised opposite the cutting edge
DE102008027224A1 (en) 2008-06-06 2009-12-10 Braun Gmbh Undercutter for the shaving head of a dry shaver
MX2016013411A (en) 2014-04-18 2017-01-18 Koninklijke Philips Nv Blade set, hair cutting appliance, and related manufacturing method.
CN106470807B (en) 2014-07-04 2019-03-15 皇家飞利浦有限公司 Set of blades, hair cutting utensil and relevant manufacturing method
IT201900011250A1 (en) * 2019-07-09 2021-01-09 Gamma Piu S R L ELECTRIC HAIR CUTTER

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US2144525A (en) * 1936-12-19 1939-01-17 American Safety Razor Corp Process of making dry shaver parts
US2223156A (en) * 1937-12-07 1940-11-26 Remington Rand Inc Electric dry shaver
US2307471A (en) * 1938-09-21 1943-01-05 Remington Rand Inc Shaving implement
US2325606A (en) * 1940-07-26 1943-08-03 Gillette Safety Rasor Company Shaving implement
US2325605A (en) * 1941-06-14 1943-08-03 Nordberg Manufacturing Co Impact member for impact crushers and securing means therefor
JP3237868B2 (en) * 1991-07-15 2001-12-10 松下電工株式会社 Manufacturing method of inner blade of reciprocating electric razor
DE4423503C1 (en) * 1994-07-05 1995-04-20 Braun Ag Bottom blade for a dry shaver apparatus
KR100447912B1 (en) * 1996-04-26 2004-11-03 산요덴키가부시키가이샤 Electric shaver and method of manufacturing outer blade
GB9614160D0 (en) * 1996-07-05 1996-09-04 Gillette Co Dry shaving apparatus
CN100410032C (en) 2001-09-10 2008-08-13 松下电工株式会社 Method of manufacturing inner blade for electric razor
JP2005198795A (en) * 2004-01-15 2005-07-28 Izumi Products Co Method of manufacturing cutter of reciprocating type electric razor and cutter
JP2006042899A (en) * 2004-07-30 2006-02-16 Matsushita Electric Works Ltd Inner blade of reciprocating type electric razor
KR200391316Y1 (en) * 2005-01-28 2005-08-02 오태준 Cutting blade assembly of electric shave
DE102005036383A1 (en) * 2005-07-29 2007-02-01 Braun Gmbh Shaving head for an electric shaver comprises a blade with an outer delimiting section facing an upper blade which is raised opposite the cutting edge
JP4963020B2 (en) * 2005-08-23 2012-06-27 株式会社泉精器製作所 Reciprocating electric razor inner blade
DE102006023774A1 (en) * 2006-05-20 2007-11-22 Braun Gmbh Undercutter for a dry razor shaving head
DE102008027224A1 (en) 2008-06-06 2009-12-10 Braun Gmbh Undercutter for the shaving head of a dry shaver

Also Published As

Publication number Publication date
US20110067244A1 (en) 2011-03-24
US8732961B2 (en) 2014-05-27
CN102056716A (en) 2011-05-11
JP2011521750A (en) 2011-07-28
JP5373068B2 (en) 2013-12-18
EP2303524A1 (en) 2011-04-06
CN102056716B (en) 2016-10-19
WO2009146798A1 (en) 2009-12-10
DE102008027224A1 (en) 2009-12-10

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