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
  • B26B19/10—Cutting heads therefor; Cutters therefor; Securing equipment thereof involving two or more different types of reciprocating cutting elements, e.g. a pair of toothed shearing elements combined with a pair of perforated cutting elements or a combined toothed and perforated cutting assembly
  • B26B19/102—Cutting heads therefor; Cutters therefor; Securing equipment thereof involving two or more different types of reciprocating cutting elements, e.g. a pair of toothed shearing elements combined with a pair of perforated cutting elements or a combined toothed and perforated cutting assembly with a secondary cutting unit being translated or slid into an operating position

Definitions

• the invention relates to a lower knife for a shaving head of a dry shaving apparatus equipped with an upper knife, with a plurality of knife blades provided parallel to one another, which are formed by means of incisions provided in an elongated profile bar, essentially transversely to its longitudinal extent, the ends the incisions are arcuate and there is a reduction in the wall thickness of each knife blade, starting from the apex of each arcuate end of each incision and leading towards an apex line of the profile bar.
• a lower knife of the type mentioned at the outset is known - see operating instructions for the dry shavers "Braun Flex Control 4515 universal", Braun Flex Control 4520 universal “and” Braun Flex Control 4525 universal ", printed notice 5-585-075 / XI-91, Page 3.
• two lower knives made from an elongated, tubular profile bar are arranged on a coupling piece, The knife blades of the respective lower knife are formed by means of incisions made by an apex line of the tubular profile bar, the incisions running parallel to one another Knife blades produced have side walls running parallel to one another, as a result of which the wall thickness of a knife blade is made uniformly thick up to the arcuate ends of each incision.
• each incision is semicircular with a radius that is half the distance between two adjacent ones Knife blades correspond to each other.
• the wall thickness of a knife blade is 0.2 mm and above. Wall thicknesses of knife blades of the size mentioned have a disadvantageous effect on the cutting behavior of lower knives.
• the object of the invention is to improve the cutting behavior of a lower knife of the type mentioned. According to the invention, this object is achieved with a bedknife of the type mentioned in the introduction in that the reduction in the wall thickness D extends from the apex SP to the apex line SL.
• a further solution to the problem according to the invention is that the reduction in the wall thickness D extends from the apex SP over an area B which is greater than half the distance A which two adjacent knife blades in the area of the apex line SL occupy one another , and that the geometric cross-sectional shape of area B is determined by a series of several radii.
• a further solution to the problem according to the invention is that the reduction in the wall thickness D extends from the apex SP over an area B whose geometric cross-sectional shape is essentially parabolic.
• a further solution to the problem according to the invention is that the reduction in the wall thickness D extends from the apex SP over an area B, the geometric cross-sectional shape of which is essentially elliptical.
• the solutions according to the inventions have a number of advantages.
• the reduction in the wall thickness D of the knife blades according to the invention, which in the direction of the apex line SL of the profiled rod and which extends beyond half the distance A between two adjacent knife blades compared to the known lower blade mentioned above, has the consequence that the lower blade with wall thickness D of the blade blades is less than 0.2 mm, less than 0.15 mm and even less than 0.1 mm, can be produced without risk of breakage.
• this reduction of the wall thickness D of the knife blades achieved over a larger range according to the invention results in a smaller overlap of the knife blades with the cutting holes of the upper knife of a shaving head, as a result of which Threading of hair into the cutting holes of the upper knife is significantly favored. In this way, the cutting result of the dry shaving apparatus is significantly improved.
• a further advantage according to the inventions results from the geometric cross-sectional shapes at incisions which can be derived from the reduction in the wall thickness D of the knife blades and which, due to the lack of corners and / or crease lines in the respective side walls of the knife blades, makes it easy to clean the knife blades from adhering hair dust, for example using a brush.
• the incision is divided into at least two areas B and C with different geometric cross-sectional shapes.
• the geometric cross-sectional shape of the area C is essentially rectangular.
• the cross-sectional shape of area C can also be essentially trapezoidal.
• an embodiment according to the invention is distinguished by arc-like transitions from different geometric cross-sectional shapes of adjacent regions B and C.
• a very slight overlap of the knife blades in the area of the apex line SL with the cutting holes of an upper knife is achieved in that the wall thickness D of a knife blade formed by two incisions in the area of the apex line is less than 0.15 mm.
• the depth of the incisions from the apex line is preferably at least half the diameter of the profile bar.
• the profile rod is formed from a hollow body.
• FIG. 1 shows an exploded view of components of a dry shaver in perspective
• FIG. 4 shows a further embodiment of a geometric cross-sectional shape of an incision and the wall thickness of a knife blade which can be derived therefrom
• FIG. 5 shows a further embodiment of a geometric cross-sectional shape of an incision and the wall thickness of a knife blade which can be derived therefrom
• FIG. 6 shows a further embodiment of a geometric cross-sectional shape of an incision and the wall thickness of a knife blade which can be derived therefrom
• FIG. 7 shows a further embodiment of a geometric cross-sectional shape of an incision and the wall thickness of a knife blade which can be derived therefrom
• FIG. 1 shows a perspective view of a dry shaving apparatus 4, the housing with 9, the on and off switch with 10, the long hair cutting system with 1 1, the housing top with 12, the opening provided in the housing top 12 with 13, the one on the coupling element 14 provided drive pin with 15, the extending in the extension of the narrow housing sides 16 supporting arms with 17 and the shaving head system pivotally mounted between the two supporting arms 17 about an axis XX with SK.
• the Support arms 17 are part of a housing head part made of plastic or molded directly onto the housing 9 (not shown).
• the shaving head system SK can also be arranged immovably on the housing 9 of a dry shaving apparatus 4.
• the shaving head system SK shows a pair of parallel shaving heads 3, which are formed by two lower knives 1 and by upper knives 2 surrounding these lower knives 1.
• the upper knife 2 can be composed, for example, by one or two shaving foils 19 which are arched in an interchangeable frame 18.
• a protective cap 20 which can be placed on the interchangeable frame 18 serves to protect the upper knives 2.
• the lower knives 1 are resiliently mounted on a common coupling element 14.
• the coupling element 14 is coupled to a drive pin 15 via the electrical drive provided through the opening 13 in the housing 9.
• the lower knife 1 shows an embodiment of a lower knife 1.
• the lower knife 1 consists of an elongated, that is to say transverse to the longitudinal extension of the dry shaving apparatus 4, profile bar 6.
• the profile bar 6 can consist of a solid bar - see Fig. 10- or a rod-shaped hollow body, for. B. a tube - see Fig. 2a - or from a U-shaped rod-shaped body - see Fig. 8 or Fig. 9-.
• the cross-sectional shape of the profile bar 6 can be circular, square, T-shaped, double T-shaped or U-shaped.
• the profile rod 6 for producing a lower knife 1 is explained in more detail below with reference to FIG. 2a.
• the profile rod 6 consists of a tubular body with an outer tube diameter of approximately 6.5 mm and an inner tube diameter of approximately 4.4 mm, that is to say with a tube thickness of approximately 1 mm.
• this tubular Profile bar 6 are made transversely to its longitudinal extent, from a vertex line SL, a plurality of incisions 7, for example by means of a grinding process, whereby the knife blades 5 are formed.
• the ends 8 of the incisions 7 are arcuate, the outermost point on the arc line being referred to as the apex SP - see Fig. 3-.
• the depth of the incisions 7 from this apex line SL to the apex SP of the arcuate ends of the incisions 7 is dimensioned such that they are approximately half the outer diameter D2 of the tubular profile rod 6 corresponds.
• a coupling element 14 is fastened on the side of the tubular profiled bar 6 opposite the apex line SL for the purpose of transmitting the drive movement to the lower knife 1. Details of the knife blade formation or the wall thickness D of the knife blades 5 of the lower knife shown in FIGS. 2 and 2a, which can be derived from the geometric shape of the incisions 7, are shown in FIG. 3 and are described in more detail below.
• each knife blade 5 is characterized by an increasing decrease in the wall thickness D of a knife blade 5, starting from the respective apex SP of an arcuate end 8 of an incision 7 and leading in the direction of the apex line SL of the profile bar 6, this reduction being the Wall thickness D extends from the apex SP to the apex line SL.
• the reduction in the wall thickness D from the apex SP in the direction of the apex line SL results in a correspondingly increasing enlargement of the gap width of an incision 7 from its end 8 to the apex line SL.
• the geometrical cross-sectional shape of the incision 7 is subdivided into two segments S1 and S2, which range from the apex SP to the apex line SL and each have different cross-sectional shapes.
• the segment S1 forming the end 8 of the incision 7 has a semicircular cross-sectional shape known per se shape and the adjoining segment S2 has a trapezoidal cross-sectional shape that adjoins it and ends in the area of the apex line SL.
• the inclination of the trapezoidal sides which adjoin the semicircular arc of segment S1 and extend obliquely outwards is approximately 1 °.
• FIG. 4 shows a further embodiment of a lower knife 1 with a geometrical cross-sectional shape of the incisions 7 which deviates from the embodiment according to FIG. 3 and thus the dependent reduction in the wall thickness D of the knife blades 5 which takes place over a larger area Area B starting from the apex SP of an incision 7 is parabolic.
• the adjoining region C, which leads to the apex line SL, is rectangular.
• the result of this rectangular shape of area C is that all side walls 21 and 22 of knife blades 5 run parallel to one another over area C.
• the parabolic region B extends over a length that is greater than the dimension of the distance A.
• the cutting angle ⁇ is 90 °
• the embodiment according to FIG 3 due to the trapezoidal geometry of segment S2 slightly larger than 90 ° -z. B. 91 ° - is formed.
• FIG. 5 shows a further embodiment of a lower knife 1, in which 4, for example, deviating from the embodiment according to FIG. 4, the geometric cross-sectional shape of area B for the purpose of reducing the wall thickness D by half a distance A, which two adjacent knife blades 5 assume in the area of the apex line SL, is elliptical.
• an edge-free or kink-free or step-free that is to say arc-shaped, course of the side walls 21, 22 of the knife blades 5 guaranteed over the direction of extension of the area B from the apex SP in the direction of the apex line SL.
• the profile bar 6 is formed from walls W1, W2 and W3 which essentially form a U-shape.
• the profile bar 6 has a curved cutting surface SF1, with a common apex line SL for all cuts 7 made from this apex line SL in the profile bar 6.
• the curved wall W1 can have the shape of a semicircular arc or a parabola, for example, the subsequent ones Walls W2 and W3 can be provided, for example, running parallel or obliquely to one another.
• FIG. 9 shows a lower knife 1 made from a profile bar 6, the walls W1, W2 and W3 of which form a U-shape and are oriented essentially at right angles to one another.
• the wall W1 has a flat surface, whereby a flat cutting surface SF2 is formed, the center line of which is provided as the apex line SL for the incisions 7.
• FIG. 10 shows a further embodiment of a lower knife 1, which is formed from a profile bar 6 having a T-profile. From the flat cutting surface SF2 there are several incisions 7 which penetrate the wall W1 and partially protrude into the wall W2 and whose depth T from the apex line SL to the apex SP of the respective incisions 7 is at least half the diameter of the profile bar 6, measured from the apex line SL to an outer wall of the profile bar 6 opposite this. In contrast to the embodiments according to FIGS. 2 to 7, the embodiment according to FIG. 10 does not consist of a hollow body, but of a solid profile rod 6.

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

Applications Claiming Priority (3)

Publications (2)

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ID=6522277

Family Applications (1)

Country Status (7)

Families Citing this family (14)

Family Cites Families (10)

• 1994
  • 1994-07-05 DE DE4423503A patent/DE4423503C1/de not_active Expired - Fee Related
• 1995
  • 1995-05-22 CN CN95193968A patent/CN1052938C/zh not_active Expired - Fee Related
  • 1995-05-22 EP EP95920854A patent/EP0769994B1/fr not_active Expired - Lifetime
  • 1995-05-22 AT AT95920854T patent/ATE176885T1/de not_active IP Right Cessation
  • 1995-05-22 WO PCT/EP1995/001936 patent/WO1996001169A1/fr active IP Right Grant
  • 1995-05-22 JP JP50363896A patent/JP3701314B2/ja not_active Expired - Fee Related
  • 1995-05-22 DE DE59505149T patent/DE59505149D1/de not_active Expired - Fee Related
  • 1995-05-25 US US08/737,539 patent/US5884404A/en not_active Expired - Fee Related

Non-Patent Citations (1)

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