EP2021153B1 - Couteau inférieur pour une tête de coupe d'un rasoir à sec - Google Patents

Couteau inférieur pour une tête de coupe d'un rasoir à sec Download PDF

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Publication number
EP2021153B1
EP2021153B1 EP07724091A EP07724091A EP2021153B1 EP 2021153 B1 EP2021153 B1 EP 2021153B1 EP 07724091 A EP07724091 A EP 07724091A EP 07724091 A EP07724091 A EP 07724091A EP 2021153 B1 EP2021153 B1 EP 2021153B1
Authority
EP
European Patent Office
Prior art keywords
cutting
lower cutter
edge
blade
cutting edge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP07724091A
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German (de)
English (en)
Other versions
EP2021153A1 (fr
Inventor
Renata Burghardt
Martin Kluge
Andreas Moehring
Ricardo Hojczyk
Werner Dalitz
Luis Burrel
Andre Nauber
Uwe Schaaf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Braun GmbH
Original Assignee
Braun GmbH
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Filing date
Publication date
Application filed by Braun GmbH filed Critical Braun GmbH
Publication of EP2021153A1 publication Critical patent/EP2021153A1/fr
Application granted granted Critical
Publication of EP2021153B1 publication Critical patent/EP2021153B1/fr
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Classifications

    • 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
    • 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 present invention relates to a lower blade for a shaving head equipped with an upper blade of a dry shaver according to the preamble of patent claim 1.
  • Aerrasiererscherkopf with a lower blade is also from the EP 0 743 144 B1 known, according to which the upper blade of the shaving head is formed as a perforated film, under which a lower blade in the form of a blade block is reciprocated.
  • the cutting edges of the blades are sharpened at an acute angle and should have a cutting angle between 35 ° and 90 °.
  • an acute sharpened bottom blade shows the DE 44 23 503 C1 a bottom blade for a dry razor shaving head, which is also intended to cooperate with a perforated shaving foil, but the cutting edges of the blades have a cutting angle of 90 °.
  • the present invention has the object to provide an improved lower blade and a shaving head and dry shaver thus improved, avoid the disadvantages of the prior art and further develop the latter in an advantageous manner.
  • a bottom blade is to be created, which has a good cutting performance with low cutting forces and thus a good pull-through behavior, without buying this with a reduced cutting edge stability and durability.
  • the cutting edge no longer be given the conventional wedge-shaped form, in which simply two acute-angled inclined planes define the cutting contour.
  • the cutting edge has at least two cutting sections with different cutting angles one behind the other in the direction of movement.
  • the cutting portion with the blunt or less acute cutting angle causes the desired cutting edge stability, while ensuring a long life.
  • the cutting edge section (s) having a sharper cutting angle (n) reduces the cutting forces, so that an improved pull-through behavior, a lower energy consumption of the razor and, in the case of oscillating shear systems, a lower risk of vibration dips can be achieved.
  • the first cutting portion viewed in the direction of movement is shorter than the usual diameter of whiskers, which is usually between 50 microns and 120 microns, whereby this cutting section cuts the beard hair before the following cutting section completely cuts through it.
  • a first cutting section with a blunt or less acute cutting angle is followed by at least one second cutting section with a more acute cutting angle.
  • the gate of the respective whisker thus takes place through the less sharp cutting section, an average can then be done by the second cutting section with the more acute cutting angle.
  • This pre-cutting arrangement of the less sharp cutting section appears surprising or even evident in view of the task of achieving low cutting forces.
  • the leading dull or less sharp cutting section substantially increases the stability of the cutting edge, while at the same time the cutting forces can be kept low by the trailing second (or even more) more acute cutting section.
  • a decreasing cutting angle when viewed in the direction of movement or cutting brings about a very good compromise between stability and cutting behavior.
  • the cutting portions are each wedge-shaped with substantially planar wedge flanks.
  • the cutting edge is accordingly in terms of The stepped cutting angle formed of the cutting angle and has in each case executed wedge flanks in the cutting sections each have a constant cutting angle.
  • the mentioned and still to be called geometry ratios with respect to the cutting angle of the cutting sections apply.
  • the cutting angle of the first cutting portion is at least 10 ° greater than the cutting angle of the following cutting section.
  • the cutting portions each have a cutting angle of less than 90 °, preferably even less than 65 °.
  • an acute-angled design of all cutting edge sections is preferred, as this can result in a significantly improved cutting behavior with lower cutting forces, with high stability being able to be obtained as long as the cutting angle of the leading cutting section is not too small.
  • the leading first cutting portion may have a cutting angle of 45 ° +/- 15 °, in particular about 45 °.
  • the following cutting portion may preferably have a cutting angle of 25 ° +/- 5 °, in particular about 25 °.
  • the length of the cutting edge viewed in the direction of movement can be divided evenly over the cutting edge sections, so that they are approximately the same length.
  • the cutting sections preferably have different lengths when viewed in the direction of movement or cutting.
  • the cutting edge is divided into two cutting sections.
  • the further cutting section follows with the smaller cutting angle so close to the first cutting section, that said first cutting section only performs a cut of the whiskers and penetrates the cutting edge with the following pointed cutting section in the whisker before this is completely severed.
  • the length of the first cutting section in the direction of movement is less than 50 microns, preferably less than 25 microns. In a preferred development of the invention, the length of the first cutting section is between 1 ⁇ m and 20 ⁇ m, in particular approximately 5 ⁇ m.
  • the length of the following cutting sections viewed in the direction of movement may be greater than 20 microns and preferably exceeds 50 microns. It can even total more than 100 microns.
  • the cutting edge over a blade top which is intended to the upper blade of the shaving head, suspended, i. the upper edge of the blade is hanging, so that the actual cutting edge is lower than the largest part of the blade top.
  • the first cutting portion is suspended in this way.
  • several cutting sections can be suspended.
  • This hanging design of the cutting edge initially further supports the desired stability of the cutting edge and life, since the suspended part of the cutting edge does not scrap directly over the top blade, so that a reduction in wear is achieved.
  • this suspended training of the cutting edge is particularly advantageous in terms of a skin-friendly shave.
  • a height difference between the highest point of the blade upper side and the cutting edge on the first cutting section is approximately between 1 ⁇ m and 20 ⁇ m, preferably less than 10 ⁇ m.
  • the blade of the at least one lower blade can be double-edged or single-edged.
  • a cutting edge can be provided, while in an oscillating driven lower blade advantageously two opposing cutting edges are provided on the blade, so that in the forward movement, the one cutting edge and the forthcoming blade is used in the forth.
  • the lower blade may have a plurality of blades, which are preferably arranged parallel to each other and are substantially aligned transversely to the direction of movement.
  • the lower blade may be in the form of a blade block.
  • an oscillating drive is provided for the lower blade or knives, it may in particular be of a linearly oscillating design.
  • the lower blade (s) can also be used in shaving heads or dry shavers which provide a rotating drive for the lower blade.
  • the lower blade is formed from a molded sheet metal part, wherein preferably at least one cutting portion of the blade cutting edge is produced by etching technology.
  • the lower blade (4) and / at least the cutting edge (11) can be produced by electrochemical etching, by embossing, by grinding, by sintering or by injection molding.
  • the blade is at least partially provided with a wear protection layer.
  • Fig. 1 shows the basic structure of a dry shaver.
  • This consists of a housing 1, which, inter alia, the inclusion of an electric motor and possibly of accumulators for energy storage and is provided with an operating switch 2.
  • an oscillating driven drive element 3 is led out of the housing 1.
  • the lower blade 4, which consists in the illustrated embodiment of two shear elements 5, has a coupling pin 6, which can be brought into coupling engagement with the drive element 3, in particular latched. In this way, the two mutually parallel shearing elements 5 can be driven in an oscillating manner along its longitudinal extent according to the double arrow 16.
  • the lower blade 4 is at least partially surrounded or covered by an upper blade 7, which is composed of a removable frame, which can be latched to the housing 1, and composed of the removable frame 8 Scherfolien 9.
  • the shear films 9 are perforated surface with through holes, which can be designed as holes and / or slots, and by the shaving during the shaving the hair in the Enter shaving head. Due to the cutting edges formed on both the shear foil passage holes and the shear elements 5 of the lower blade 4 and the movement of the lower blade 4 relative to the upper blade 7, hairs entering the shaving head are sheared off between the respective cutting edges.
  • Fig. 2 shows in an enlarged scale a shear element 5 of the lower blade 4, in which a plurality of blades 10 - in the illustrated embodiment, parallel to each other - are arranged side by side.
  • the blades 10 of the lower blade 4 are each U-shaped, wherein at the free edges of the strip-shaped, bent into a U blades 10 and the respective edges 11 arranged on opposite sides of each blade 11 are curved circumferentially and away from each other ,
  • the aligned along the direction of movement of the lower blade 4 strip-shaped mounting portion 12 allows the attachment of the shear element 5 to a coupling piece, by means of which a connection to the drive can be produced.
  • Fig. 4 shows, the opposing blades 11 of each blade 10 are suspended from the blade top 13.
  • This central raised portion 14 join the outer slopes 15, starting from the cutting edges 17 of the blades 11 to the central raised portion 14 out at the angle of attack a to the top of the blade, ie in accordance with Fig. 4 upward, rise.
  • the said angle of attack a is between 0.5 ° and 30 °, preferably approximately between 1 ° and 20 °, in particular approximately 5 °.
  • height difference D between the raised portion 14 of the blade top 13 and the cutting edges 17 is preferably between 1 micron and 20 microns. If he were chosen too large, there would be the risk of hair being drawn between the foil and the bottom knife, which would then not cut these hairs, but only clamped and / or torn. If he were chosen too small, there would be the risk of skin irritation.
  • the cutting edges 11 of the blade 10 have a cutting angle graduation.
  • the respectively considered in the direction of movement or cutting direction 16 front lying first cutting portion 18, on each of which the cutting edge 17 is provided, has a cutting angle ⁇ 1 of less than 90 °, preferably 45 ° +/- 15 °. This cutting angle takes in the direction of movement from the back of the blade.
  • a second cutting portion 19, which travels in the section of said first cutting portion 18, has a cutting angle ⁇ 2 , which is smaller than the first cutting angle ⁇ 1 and 25 ° +/- 5 ° in a preferred embodiment of the invention.
  • the first cutting section 18 causing the gate extends in the direction of movement over a length ⁇ 1 (cf. Fig. 4 ) of preferably less than 50 microns and is in a preferred embodiment of the invention between 1 micron and 20 microns.
  • the cutting angle gradation is provided on the underside of the cutting edges 11, which is the intended purpose for the outer cutter 7.
  • the two cutting portions 18 and 19 are each wedge-shaped with flat wedge flanks, wherein just the cutting contour according to Fig. 4 means.
  • the said wedge flanks are also arched in a U-shape in the manner of an arc through the overall U-shaped configuration of the blades.
  • a second cutting edge 20 results on the lower sides of the cutting edge 11, cf. Fig. 4 ,
  • the cutting edges 17 of the cutting edges 11 can advantageously be slightly rounded, with an edge radius R at the cutting edges 17 advantageously being 2 ⁇ m or less, preferably even less than 1 ⁇ m.
  • the entire edge projection E of the cutting edges 11, that is to say the extent of the cutting wedge along the direction of movement 16, is advantageously more than 50 ⁇ m, if possible even 100 ⁇ m or more, cf. Fig. 4 , This can ensure that the cutting wedge can penetrate completely into the hair and cut it.
  • Fig. 5 also shows a cross section through a blade along the line BB of Fig. 3 , this embodiment compared to the embodiment according to Fig. 4 an additional angle of attack ⁇ 2 and a further cutting angle ⁇ 3 has.
  • the blade 10 which in turn is symmetrical with respect to the center line, has a blade top 13, which also has a raised central portion 14, but is suspended both at the edges K1 and K2.
  • the blade top 13 depends on the contact plane 0 in the area between the edges K2 and K1 by the angle ⁇ 2 , while the suspension angle in the range from the edge K1 to the Cutting edge 17 relative to the contact plane 0 depends on the suspension angle ⁇ 1 down.
  • ⁇ 1 is greater than ⁇ 2 .
  • the opposing blades 11 of the blade 10 not only have first and second blade portions 18 and 19 of lengths ⁇ 1 and ⁇ 2 , respectively, but also have a third blade portion 21 of length ⁇ 3 . This is formed by a further wedge angle graduation on the wedge angle ⁇ 3 taking place on the underside at the edge K3.
  • ⁇ 1 is greater than ⁇ 2 is greater than ⁇ 3 .
  • the cutting behavior of a lower blade can be optimally adapted to the required criteria - on the one hand stability of the cutting edge and on the other hand occurring cutting force - it should be noted that the number of cutting angles used ⁇ and / or waste angle ⁇ not limited to the number 2 or 3 as described in the examples, but can be chosen arbitrarily, as long as at least two cutting angles are formed.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Dry Shavers And Clippers (AREA)
  • Knives (AREA)

Claims (13)

  1. Lame inférieure pour une tête de rasage d'un rasoir électrique pourvue d'une lame supérieure (7), comprenant au moins un couteau (10), qui présente au moins une arête tranchante (11) dirigée dans au moins un de ses sens de mouvement (16), l'arête tranchante (11) présentant successivement, dans le sens de mouvement, au moins deux sections de coupe (18, 19, 21) dotées de différents angles de coupe (ϕ1, ϕ2, ϕ3,... ϕn), la première section de coupe (18) dotée d'un premier angle de coupe ϕ1) dans le sens du mouvement (16) étant suivie d'au moins une deuxième section de coupe (19) dotée d'un deuxième angle de coupe, plus petit (ϕ2), caractérisée en ce que la première section de coupe (18) dans le sens du mouvement (16) possède une longueur (ε1) dans le sens du mouvement (16) de moins de 50 µm, de préférence de moins de 25 µm.
  2. Lame inférieure selon la revendication précédente, caractérisée en ce que la deuxième section de coupe (19) est suivie d'autres angles de coupe ϕn, la relation suivante étant valable pour tous les angles ϕε : ϕεn < ϕn-1.
  3. Lame inférieure selon la revendication précédente, dans laquelle l'angle de coupe précédant (ϕn-1) est plus grand d'au moins 10° que l'angle de coupe suivant (ϕn).
  4. Lame inférieure selon la revendication précédente, dans laquelle les angles de coupe (ϕ1 à ϕn) des sections de coupe (18, 19, 21) sont chacun inférieurs à 90°, de préférence inférieurs à 65°.
  5. Lame inférieure selon l'une des revendications précédentes, dans laquelle un premier angle de coupe est de 45° +/- 15° et/ou un deuxième angle de coupe est de 25° +/- 5°.
  6. Lame inférieure selon l'une des revendications précédentes, dans laquelle les sections de coupe (18, 19, 21) sont chacune conçues approximativement en forme de coin avec des flancs de coin plans ou convexes ou concaves dans la coupe longitudinale (B-B).
  7. Lame inférieure selon l'une des revendications précédentes, dans laquelle les sections de coupe (18, 19, 21), vues dans le sens de mouvement (16), possèdent des longueurs différentes (ε1,ε2,... εn).
  8. Lame inférieure selon l'une des revendications précédentes, dans laquelle la longueur (ε1) de la première section de coupe (18) est d'environ 5 µm.
  9. Lame inférieure selon l'une des revendications précédentes, dans laquelle la longueur totale (E) de toutes les sections de coupe (ε1, ε2,... εn) dans le sens de mouvement (16) est supérieure à 50 µm, de préférence supérieure à 100 µm.
  10. Lame inférieure selon l'une des revendications précédentes, dans laquelle l'arête tranchante (11) est suspendue par rapport à une face supérieure du couteau (13) qui est tournée conventionnellement vers la lame supérieure (7).
  11. Lame inférieure selon la revendication précédente, dans laquelle l'arête tranchante (11) est décrochée de la face supérieure du couteau (13) à un ou plusieurs angle(s) de suspension (α).
  12. Lame inférieure selon l'une des revendications précédentes, dans laquelle le couteau (10) possède deux arêtes tranchantes (11) opposées l'une à l'autre.
  13. Lame inférieure selon l'une des revendications précédentes, dans laquelle le couteau (10) est pourvu au moins partiellement d'une couche de protection contre l'usure.
EP07724091A 2006-05-20 2007-04-07 Couteau inférieur pour une tête de coupe d'un rasoir à sec Active EP2021153B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006023774A DE102006023774A1 (de) 2006-05-20 2006-05-20 Untermesser für einen Trockenrasiererscherkopf
PCT/EP2007/003150 WO2007134672A1 (fr) 2006-05-20 2007-04-07 Couteau inférieur pour une tête de coupe d'un rasoir à sec

Publications (2)

Publication Number Publication Date
EP2021153A1 EP2021153A1 (fr) 2009-02-11
EP2021153B1 true EP2021153B1 (fr) 2012-03-28

Family

ID=38180454

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07724091A Active EP2021153B1 (fr) 2006-05-20 2007-04-07 Couteau inférieur pour une tête de coupe d'un rasoir à sec

Country Status (7)

Country Link
EP (1) EP2021153B1 (fr)
JP (1) JP5242559B2 (fr)
CN (1) CN101448610B (fr)
AT (1) ATE551160T1 (fr)
DE (1) DE102006023774A1 (fr)
RU (1) RU2434738C2 (fr)
WO (1) WO2007134672A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005036383A1 (de) * 2005-07-29 2007-02-01 Braun Gmbh Scherkopf für einen elektrischen Rasierapparat
DE102008027224A1 (de) * 2008-06-06 2009-12-10 Braun Gmbh Untermesser für den Scherkopf eines Trockenrasierapparates

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2238813A (en) 1940-03-30 1941-04-15 Jacob L Kleinman Razor
FR989663A (fr) 1944-02-24 1951-09-12 Appareil de rasage à sec
JPS5341590B2 (fr) * 1971-09-22 1978-11-04
JPS5547879A (en) * 1978-09-30 1980-04-05 Matsushita Electric Works Ltd Electric razor
NL7811437A (nl) * 1978-11-21 1980-05-23 Philips Nv Scheerapparaat.
DE2857601C2 (de) * 1978-12-07 1982-01-14 Philips Patentverwaltung Gmbh, 2000 Hamburg "Schermesser für ein Trockenrasiergerät mit einem als Haarzugelement dienenden Vormesser"
DE3047888A1 (de) * 1980-12-19 1982-07-15 Philips Patentverwaltung Gmbh, 2000 Hamburg "schneidwerkzeug, verfahren zu seiner herstellung und seine verwendung"
GB2226972A (en) * 1989-01-17 1990-07-18 Rong Fang Yu Blade device for an electric shaver
DE4423503C1 (de) 1994-07-05 1995-04-20 Braun Ag Untermesser für einen Trockenrasierapparat
DE69610576T2 (de) 1995-05-19 2001-05-31 Matsushita Electric Works Ltd Schneideinheit für elektrischen Rasierapparat
JP4948735B2 (ja) * 2000-05-23 2012-06-06 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ シェービング装置
US6951056B2 (en) * 2001-08-10 2005-10-04 Matsushita Electric Works, Ltd. Electric razor inner blade unit
US7022195B2 (en) * 2001-09-10 2006-04-04 Matsushita Electric Works, Ltd. Method of manufacturing inner blade for electric razor
JP4032808B2 (ja) * 2002-04-19 2008-01-16 松下電工株式会社 バリカン刃の製造方法
JP4024715B2 (ja) * 2003-05-12 2007-12-19 九州日立マクセル株式会社 電気かみそり
JP2005168631A (ja) * 2003-12-09 2005-06-30 Izumi Products Co 往復式電気かみそり

Also Published As

Publication number Publication date
RU2434738C2 (ru) 2011-11-27
JP5242559B2 (ja) 2013-07-24
CN101448610B (zh) 2011-11-30
WO2007134672A8 (fr) 2008-11-13
DE102006023774A1 (de) 2007-11-22
CN101448610A (zh) 2009-06-03
WO2007134672A1 (fr) 2007-11-29
ATE551160T1 (de) 2012-04-15
RU2008145761A (ru) 2010-05-27
EP2021153A1 (fr) 2009-02-11
JP2009537189A (ja) 2009-10-29

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