EP0229679B1 - Verfahren zum Ausbilden eines nach Wunsch und Verwendungszweck ausgeformten scheraktiven Bereiches am Scherkopf eines Trockenrasierapparates - Google Patents

Verfahren zum Ausbilden eines nach Wunsch und Verwendungszweck ausgeformten scheraktiven Bereiches am Scherkopf eines Trockenrasierapparates Download PDF

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Publication number
EP0229679B1
EP0229679B1 EP87200016A EP87200016A EP0229679B1 EP 0229679 B1 EP0229679 B1 EP 0229679B1 EP 87200016 A EP87200016 A EP 87200016A EP 87200016 A EP87200016 A EP 87200016A EP 0229679 B1 EP0229679 B1 EP 0229679B1
Authority
EP
European Patent Office
Prior art keywords
shaving
foil
curvature
area
cutter
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.)
Expired - Lifetime
Application number
EP87200016A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0229679A1 (de
Inventor
Leo Bertram
Hugo Dr. Schemmann
Romuald Leander Bukoschek
Reinhard Dr. Huszar
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Priority to AT87200016T priority Critical patent/ATE55305T1/de
Publication of EP0229679A1 publication Critical patent/EP0229679A1/de
Application granted granted Critical
Publication of EP0229679B1 publication Critical patent/EP0229679B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the invention relates to a method for forming a shear-active area on the shaving head of a dry shaving apparatus which is shaped as desired and intended for use, in which a shaving foil in the shaving head frame is slidably arched in the clamping points under tension and a lower knife is pressed into the prestressing arch, the cutting edges of which are also curved are, the tangents to the clamping curvature in the clamping points towards the shaving head apex enclose an acute angle with one another, and a shaving head produced with the aid of this method.
  • Shaving heads for dry shavers which consist of a curved, clamped film and a lower knife, which is also pressed into the film curvature and are also curved on the cutting edges, are known (AT-PS 171 778). While in this state of the art of shear foil the shape of the circular-cylindrical lower knife is forced on with the aid of the resiliently pressed-in lower knife, it is also known to force an approximately circular clamping curvature onto a shaving foil by means of a shaping clamping, which then becomes only insignificant when a circular lower knife is pressed in Changes in shape.
  • Circular shaving heads with a relatively wide clamping base diameter suffer from insufficient rigidity of the shaving foil when shaving, especially when firmly clamped. Any change in shape of the shaving foil during shaving changes the surface contact between the shaving foil and the lower knife. This shortens the shaving result when shaving.
  • Such a design of a shaving head results in a concentration of the pretensioning forces in the shear-active area.
  • concentration of forces between the lower knife and the shaving foil, when they work together moves into the desired shear-active area of the shaving head. This is a force distribution that is favorable for the shaving effect.
  • the total pressure force can be set below 4 Newtons.
  • the shear-active area of the shaving head can be chosen in the crown or on the side of the crown.
  • a shear-active area in the apex area of the shaving head is preferred in the case of slim shaving heads, because the point to be shaved is easily visible to the slim tip in the mirror.
  • a shaving head which is produced with the aid of the method according to the invention is characterized in that the bending line of the freely clamped shaving foil on both sides of the center of the shear-active area has a larger radius of curvature than the shaving knife before the shear knife is pressed in.
  • the pretension can be specifically aligned to the shear-active area. Where the shear-active area is to lie, the slimmer lower knife presses against the shaving foil and tensions it or pre-tensions it more than in the other shaving foil areas.
  • the preselection of the clamping length, the distance between the clamping points and the clamping angle is primarily decisive for the curve shape of the shaving head.
  • the curve shape can be wide Ren embodiment of the invention further influence that the shaving foil in the apex area, which should be the shear-active area, has a lower bending stiffness than on the flanks to the side of the apex area.
  • the different bending stiffness can be used to bend the shaving foil in the crown more than on the flanks, so that a wedge shape can be worked out better.
  • the change in bending stiffness can e.g. B. can be achieved by changing the cross section or perforating the film. In this way, the shaving foil can assume a more wedge-shaped shape even in the freely clamped state.
  • the normal pressure required for shaving between the lower knife and the shaving foil in the shear-active area must be generated by shaping the lower knife appropriately using the simulation method described.
  • a more wedge-shaped shaving head design leads to better adaptation to the shape of the face and a better view of the area just shaved.
  • the clamping height between the film clamping points and the apex is 18 to 30 mm in order to form a pointed shaving head apex with a clamping base width of the shaving foil of 12 to 20 mm.
  • FIG. I shows a shaving foil I of a dry shaving apparatus, which is held in a load-free manner in clamping points 3 of a shaving head frame 4.
  • the tangents 8 to the shaving foil enclose with the shaving head base 6 between the clamping points and to the apex acute clamping angle a.
  • the mutual distance between the clamping points 3 is indicated by x.
  • the clamping length of the shaving foil is I. In this way, the shaving foil gets a natural curve shape that should be as close as possible to the desired shape.
  • a desired normal pressure load is applied to the shaving foil, which corresponds to the desired normal pressure load by the lower knife in the idle state and which should be greater than that during shaving lifting forces occurring.
  • This preferred load is indicated in Fig. 1 by arrows 5.
  • the arrows 5 directly in the apex 7 should correspond to a compressive force of approximately 1.2 N and, as the flanks 9 decrease, reflect compressive forces of 0.5 N to 0 N.
  • FIG. 2 now shows how the simulated application of the pressure load is carried out.
  • the film section II in FIG. 2 is divided into very small sections a, b, c, etc. using the finite element method.
  • the forces acting on the foils are applied. These forces are represented by arrows 13.
  • the size of the arrows 13 indicates the desired pressure force distribution, as shown in Fig. I.
  • a prestressing curvature can then be determined on the basis of this pressure force distribution.
  • the shaving foil in cooperation with the curved lower knife 10 in the shear-active area SK, for example in FIG. I in the apex, ensures the necessary contact forces.
  • a prerequisite for proper functioning is, of course, that the bottom knife 10 lies completely against the film in the simulated area and that the film adopts the simulated pretensioning curvature.
  • the contact pressure of the lower knife results from the pressure distribution which acts on the cutting edges 16.
  • the concentration of forces is placed in the shear-active area at the apex.
  • the curvature shape A of the lower knife 10 which corresponds to the initial curvature of the film and is shown in FIG. 3, has a slimmer cutting edge contour than the film according to FIG. I in the idle state without a lower knife.
  • This shaving head shape determined by simulation, can be adapted to the respective needs in accordance with the desired shaving active area.
  • Fig. 4 shows an embodiment in which the shear active area SK is placed in a flank. According to the simulation according to FIG. 2, a corresponding distribution of forces is applied to the shaving foil 18. As a result of this force distribution simulated on the shaving foil, the shaving foil 18 experiences a prestressing curvature of shape B, which also forms the cutting edge contour of the lower knife 10 '.
  • FIG. 0 shows a further exemplary embodiment in which the shaving foil 31 in the apex 7 has greater flexibility.
  • the film 31, which is clamped freely displaceably between the clamping points 3 can already form a more wedge shape when an unloaded bending line is formed. If a simulated load is now given up again in accordance with the arrows entered in FIG. 6, a simulated prestressing curvature results.
  • the prestressing curvature is again the cutting edge contour C of the lower knife 20 according to FIG. 7.
  • the greater flexibility of the shaving foil 31 in the apex area 7 can be influenced by varying the thickness of the foil and the width and number of webs between the holes and also the shape and number of the holes.
  • the shape of the shaving head depends on the desired requirements of the device and manufacturer of the device.
  • the curvatures of the film or lower knife can follow a cosine-hyperbolic-shaped, elliptical or parabolic course. Intermediate values are also conceivable.
  • the basic idea of the invention can be seen in the stiffening of the shear-active area SK by the corresponding curvature of the shaving foils and the lower knife.
  • the manufacturer or designer is given the hand to create shaving head shapes of your own choice and as desired, while maintaining contact between the shaving foil and the lower knife in the desired shaving active area and consequently achieving good shaving results.
  • the known lifting effects, which reduce the shaving performance, are no longer present.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dry Shavers And Clippers (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
EP87200016A 1986-01-17 1987-01-07 Verfahren zum Ausbilden eines nach Wunsch und Verwendungszweck ausgeformten scheraktiven Bereiches am Scherkopf eines Trockenrasierapparates Expired - Lifetime EP0229679B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87200016T ATE55305T1 (de) 1986-01-17 1987-01-07 Verfahren zum ausbilden eines nach wunsch und verwendungszweck ausgeformten scheraktiven bereiches am scherkopf eines trockenrasierapparates.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3601202 1986-01-17
DE19863601202 DE3601202A1 (de) 1986-01-17 1986-01-17 Verfahren zum ausbilden eines bevorzugten scheraktiven bereichs im scherkopf eines trockenrasierapparates

Publications (2)

Publication Number Publication Date
EP0229679A1 EP0229679A1 (de) 1987-07-22
EP0229679B1 true EP0229679B1 (de) 1990-08-08

Family

ID=6292014

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87200016A Expired - Lifetime EP0229679B1 (de) 1986-01-17 1987-01-07 Verfahren zum Ausbilden eines nach Wunsch und Verwendungszweck ausgeformten scheraktiven Bereiches am Scherkopf eines Trockenrasierapparates

Country Status (7)

Country Link
US (1) US4807365A (enrdf_load_stackoverflow)
EP (1) EP0229679B1 (enrdf_load_stackoverflow)
JP (1) JPS62170285A (enrdf_load_stackoverflow)
AT (1) ATE55305T1 (enrdf_load_stackoverflow)
CA (1) CA1264412A (enrdf_load_stackoverflow)
DE (2) DE3601202A1 (enrdf_load_stackoverflow)
ES (1) ES2017997B3 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0516188D0 (en) * 2005-08-05 2005-09-14 Gillette Co Electric razors
JP2008093284A (ja) * 2006-10-13 2008-04-24 Matsushita Electric Works Ltd 往復動式電気カミソリの外刃およびその製造方法
DE102008046072A1 (de) * 2008-09-05 2010-03-11 Braun Gmbh Scherkopf für einen Rasierapparat

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT171778B (de) * 1951-01-18 1952-07-10 Elektromechanik Salzburg Ges M Scherkopf für Trockenrasierapparate
DE1056000B (de) * 1957-02-13 1959-04-23 Otto Huebner Scherkopf fuer Rasiergeraete
US3092905A (en) * 1961-04-03 1963-06-11 Ever Ready Razor Products Ltd Dry shaver with flexible shear plate and means supporting the shear plate
DE1553639C3 (de) * 1965-10-22 1980-01-03 Braun Ag, 6000 Frankfurt Schmiegsame Siebfolie für Trockenrasierapparate
NL6615194A (enrdf_load_stackoverflow) * 1966-10-27 1968-04-29
US3376636A (en) * 1966-11-28 1968-04-09 Sunbeam Corp Shaving head for electric dry shaver
US3973323A (en) * 1971-06-12 1976-08-10 U.S. Philips Corporation Shaving head for a dry-shaving apparatus
NL7108090A (enrdf_load_stackoverflow) * 1971-06-12 1972-12-14
JPS5325665Y2 (enrdf_load_stackoverflow) * 1972-03-27 1978-06-30
JPS54136976A (en) * 1978-04-15 1979-10-24 Matsushita Electric Works Ltd Reciprocating type electric shaver
NL181181C (nl) * 1980-03-15 1987-07-01 Matsushita Electric Works Ltd Scheerbladsamenstel voor een elektrisch scheerapparaat van het vibratietype.
DE3213834A1 (de) * 1982-04-15 1983-10-27 Braun Ag, 6000 Frankfurt Scherteil fuer trockenrasierapparate und haarschneidemaschinen
DE3340661C2 (de) * 1983-11-10 1991-03-07 Philips Patentverwaltung Gmbh, 2000 Hamburg Scherkopf für einen Trockenrasierapparat mit einer gekrümmt eingespannten Scherfolie

Also Published As

Publication number Publication date
JPS62170285A (ja) 1987-07-27
DE3601202A1 (de) 1987-07-23
CA1264412A (en) 1990-01-16
EP0229679A1 (de) 1987-07-22
US4807365A (en) 1989-02-28
DE3764097D1 (de) 1990-09-13
ES2017997B3 (es) 1991-03-16
ATE55305T1 (de) 1990-08-15
JPH0318911B2 (enrdf_load_stackoverflow) 1991-03-13

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