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, with at least one blade having at least one in the at least one direction of movement facing cutting edge.
• the invention further relates to a shaving head with such a lower blade and a dry shaver equipped therewith.
• a dry razor shaving head with such a lower blade is known for example from EP 0 743 144 B1, according to which the upper blade of the shaving head is formed as a perforated foil, under which a lower blade in the form of a blade block is moved back and forth.
• the cutting edges of the blades are sharpened at an acute angle and should have a cutting angle between 35 ° and 90 °.
• DE 44 23 503 C1 shows a lower blade for a dry razor shaving head, which is also intended to cooperate with a perforated 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.
• this object is achieved by a lower blade according to claim 1, a shaving head according to claim 23 and a dry shaver according to claim 24.
• Preferred embodiments of the invention are the subject of the dependent claims.
• 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 edge section (s) having a more acute cutting angle (s) reduce 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.
• 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 graduated in terms of the cutting angle and has in each case executed wedge flanks in the cutting sections each have a constant cutting angle.
• 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. - A -
• 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 first cutting section viewed in the direction of movement is shorter than the usual diameter of whiskers, which is usually between 50 microns and 120 microns.
• 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 is an exploded perspective view of a dry shaver
• FIG. 2 shows a side view of a single cutting element of a lower blade according to the invention of the shaving head of a dry shaver according to an embodiment of the invention
• FIG. 3 shows a sectional view through the cutting element from FIG. 2 along the line A-A entered therein, FIG.
• FIG. 4 shows a cross section through a blade of the lower blade along the line B-B in Fig. 3 and
• Fig. 5 shows another embodiment of a blade according to the invention.
• Fig. 1 shows the basic structure of a dry shaver.
• This consists of a housing 1, which u.a. 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. Because of 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 or cut between the respective cutting edges.
• Fig. 2 shows an enlarged view of 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 on the free edges of the strip-shaped, bent into a U blades 10 and the respective arranged on opposite sides of each blade 10 cutting 11 arcuate circumferentially and facing 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.
• the opposing blades 11 of each blade 10 are suspended from the blade top 13.
• the outer slopes 15 follow, starting from the cutting edges 17 of the cutting edges 11 towards the central raised portion 14 at the angle of attack a to the top of the blade, i. as shown in FIG. 4 upwards, rise.
• the said angle of attack a is between 0.5 ° and 30 °, preferably approximately between 1 ° and 20 °, in particular approximately 5 °.
• 4 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 blades 11 of the blade 10 have a cutting angle graduation.
• the first cutting edge section 18, viewed in the direction of movement or cutting direction 16 at the front, on each of which the cutting edge 17 is provided, has a cutting angle (P 1 of less than 90 °, preferably 45 ° +/- 15 ° takes in the direction of movement from the back of the blade.
• a second cutting section 19, which traverses the said first cutting section 18 when cut, has a cutting angle ⁇ 2 which is smaller than the first cutting angle ⁇ i and, in a preferred embodiment of the invention, 25 ° +/- 5 °.
• the first cutting section 18 causing the gate extends in the direction of movement over a length ⁇ i (see FIG. 4) of preferably less than 50 ⁇ m and in a preferred embodiment of the invention is between 1 ⁇ m and 20 ⁇ m.
• the cutting angle graduation is provided on the underside of the cutting edges 11, which faces away from the upper blade 7 as intended.
• the two cutting portions 18 and 19 are each wedge-shaped with flat wedge flanks, wherein just the sectional contour of 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. This makes it possible to ensure that the cutting wedge can penetrate completely into the hair and cut it.
• FIG. 5 likewise shows a cross section through a blade along the line BB of FIG. 3, this embodiment having an additional trailing angle ⁇ 2 and a further cutting angle ⁇ 3 compared with the embodiment according to FIG. 4.
• 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 ⁇ i down.
• Ci 1 is greater than ⁇ 2 .
• the opposite cutting edges 11 of the blade 10 not only have a first and a second cutting portion 18 and 19 with the lengths E 1 and ⁇ 2 , respectively, but also has a third cutting portion 21 with the length ⁇ 3 on. This is formed by a further wedge angle graduation on the wedge angle ⁇ 3 taking place on the underside at the edge K3.
• ⁇ i 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)

Applications Claiming Priority (2)

Publications (2)

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• 2006
  • 2006-05-20 DE DE102006023774A patent/DE102006023774A1/de not_active Withdrawn
• 2007
  • 2007-04-07 EP EP07724091A patent/EP2021153B1/fr active Active
  • 2007-04-07 JP JP2009510301A patent/JP5242559B2/ja active Active
  • 2007-04-07 WO PCT/EP2007/003150 patent/WO2007134672A1/fr not_active Ceased
  • 2007-04-07 RU RU2008145761/02A patent/RU2434738C2/ru not_active IP Right Cessation
  • 2007-04-07 AT AT07724091T patent/ATE551160T1/de active
  • 2007-04-07 CN CN2007800184427A patent/CN101448610B/zh active Active

Non-Patent Citations (1)

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