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
  • B26B19/044—Manufacture and assembly of cutter blocks
• • 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

Definitions

• the invention relates to a shaving head for an electric shaver, comprising a lower blade, which has at least one in at least one direction of movement relative to a at least partially surrounding lower blade driven blade, which is provided with at least one pointing in the direction of movement cutting edge.
• Such a shaving head formed from a combination with a lower and an upper blade is known, for example, from EP-B-0 743 144.
• the upper blade of this shaving head is designed as a perforated foil and cooperates with a lower blade formed from a plurality of blades, in which the cutting edges of the individual blades have a cutting angle of less than 90 °.
• a lower blade for such a shaving head is known, in which the blades have a cutting edge angle of 90 °.
• the object of the present invention is to obtain the advantages of the sharp-edged lower blades with respect to the low cutting forces, while still avoiding skin irritations due to shaving and to obtain the superior skin care of the cutting systems with right-angled cutting edge.
• This object is achieved in that the blade having a relation to the cutting edge raised, pointing in the direction of the upper blade, outer boundary portion which increases from the cutting edge to the upper blade out.
• the shaving head according to the invention can be used in a wide variety of types of electric shavers, it being particularly advantageous if the lower blade has a plurality of blades.
• the at least one blade has two mutually opposite cutting edges.
• the edge angle of the cutting edge which is formed by the inner and outer legs of the edge angle is less than or equal to 90 °, which It has been found that optimum shaving performance can be achieved with edge angles between 20 ° and 90 °, preferably about 45 °
• the lower cutting forces also reduce the risk of vibration dips due to high stress in oscillating shear systems.
• the shaving results are very much influenced by the radius of the cutting edge, with excellent shaving results with edge radii less than or equal to 2 microns, preferably less than or equal to 1 micron, can be achieved.
• the height difference between the outermost point of the raised boundary section and the cutting edge is between 1 ⁇ m and 20 ⁇ m. It should be noted that excessively large gaps between the lower and upper blades may cause ability to retract the hair to be shaved between the two shaving parts can result, which can lead to a painful plucking, which is to be avoided.
• a preferred embodiment of the invention provides that the angle of attack, ie the angle between the direction of movement of the lower blade and the outer leg of the edge angle, between 20 ° and 1 °, preferably between 2 ° and 5 °.
• the angle of attack ie the angle between the direction of movement of the lower blade and the outer leg of the edge angle, between 20 ° and 1 °, preferably between 2 ° and 5 °.
• the outer boundary line ie the course between the cutting edge and the raised area, can be linear or else at least partially spherical. It is important that the contour of the outer limiting section 17 be continuous, i. without a jump, in particular without a jump, runs.
• a further advantageous embodiment of the invention provides that the lower blade is driven in rotation; In contrast, a further advantageous embodiment provides an oscillating, in particular linearly oscillating drive.
• a particularly cost-producible embodiment provides that the lower blade is formed from a molded sheet metal part, wherein preferably the lower blade or at least the cutting edge are made on etching path. It is particularly favorable with regard to the service life of the shearing part when the blade is at least partially provided with a wear protection layer.
• 1 is a schematic diagram of a dry shaver
• FIG. 3 shows a section through a cutting element along the lines A-A of FIG. 2,
• Fig. 5 in an enlarged view (corresponds approximately to a section B-B of FIG. 3) a blade element of the lower blade.
• the dry shaver shown in Fig. 1 consists of a housing 1, which serves among other things, the inclusion of an electric motor and, where appropriate, accumulators for energy storage and is provided with an on / off switch 2. At the upper end an oscillating driven drive element 3 is led out of the housing 1.
• the lower blade 4, which consists in particular of the shear elements 5, has a coupling pin 6, which can be locked to the drive element 3. In this way, the two mutually parallel shearing elements 5 can then be driven in an oscillating manner along its longitudinal extension (double arrow 16).
• the lower blade 4 is at least partially surrounded by an upper blade 7, which is composed of a removable frame, which can be latched to the housing 1, and made of shear plates 9 attached to the removable frame 8.
• the shaving foils 9 are perforated flat with passage openings which can be embodied as holes and / or slits, 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 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 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 this case, parallel to each other - is arranged.
• the blades 10 of the lower blade 4 are U-shaped, wherein at the free edges of the strip-shaped, curved into a U blades 10 and the cutting edges 11 each arcuately rotate and are remote from each other.
• the aligned along the direction of movement of the lower blade 4 strip-shaped portion 12 serves to attach the shear element 5 to a coupling piece by means of which a connection to the drive is made.
• FIG. 4 shows the interaction between the lower, upper blade and the skin to be shaved 13.
• the outer limiting portion 17 of the blade 10, which extends between the two opposing cutting edges 11, has a central raised portion 18 which is planar and extends along the contact plane 15. At these close to the outer slopes 19, starting from the cutting edges 11 to the central raised portion 18 out with the Anstellwinke! B outside, i. rise in the drawing upwards.
• This angle of attack B is in terms of amount between 22 ° and 1 °, preferably 2 ° to 5 °.
• the edge radius R of the cutting edges 11 is 2 ⁇ m or less, preferably even less than 1 ⁇ m.
• the edge angle A of the wedge-shaped cutting edges 11 is 90 ° or less, as the preferred angular amount has been found to be 45 ° ⁇ 10 °.
• the height difference D between the raised portion 18 and the cutting edge 11 is selected in terms of amount between 1 micron and 20 microns. If he were chosen too large, there would be the risk of pulling hair between the foil and the bottom knife, which would not cut this hair, but only clamped or torn.
• the skin 13 arched through the foil 9 is not cut in spite of the sharp-edged cutting edge 11, but can be pushed over the outer boundary 17 of the blade 10 while the blade 10 is moving, forming a skin ridge 20 and optionally even out of the opening 14 of the shaving foil 9, at least into the area of the contact plane 15.
• any hair that may be present on this section of the skin can nevertheless be sheared off. In this way, a skin-friendly yet thorough shave is ensured.
• edge angle A of about 45 ° is a compromise between required stability of the cutting edge and still the lowest possible cutting forces. While too large edge angle hair is not optimally separated, too low wedge angle lead to stability problems, such as edge breakouts or local Kantenumbiegonne.
• the edge projection E of the cutting edge 11, ie the extension of the cutting wedge along the direction of movement 16, should be more than 50 ⁇ m, if possible even 100 ⁇ m or more. This ensures that the wedge of the cutting edge 11 completely penetrate into the hair and it can cut through it.
• the transition from the cutting edge 1 1 to the central raised portion 18 of the outer boundary portion does not necessarily have to be made with straight contours in cross-section contours, but it is also a spherical design of the outer boundary portion possible, in which the transition 19th is not formed as an oblique, but as a convex curved contour. However, it must be ensured that this convex contour extends substantially within the specified edge angle A.

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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)
• Nonmetal Cutting Devices (AREA)

Applications Claiming Priority (2)

Publications (2)

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• 2005
  • 2005-07-29 DE DE102005036383A patent/DE102005036383A1/de not_active Withdrawn
• 2006
  • 2006-07-22 US US11/996,575 patent/US8082670B2/en active Active
  • 2006-07-22 DE DE502006005984T patent/DE502006005984D1/de active Active
  • 2006-07-22 CN CN2006800279136A patent/CN101232981B/zh active Active
  • 2006-07-22 AT AT06762771T patent/ATE455627T1/de active
  • 2006-07-22 EP EP06762771A patent/EP1910042B1/fr active Active
  • 2006-07-22 WO PCT/EP2006/007231 patent/WO2007014660A1/fr not_active Ceased
  • 2006-07-22 RU RU2008107730/02A patent/RU2401192C2/ru not_active IP Right Cessation
  • 2006-07-22 JP JP2008523202A patent/JP5026419B2/ja active Active

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