US3714807A - Process of making a cutter foil for dry shaving apparatus - Google Patents

Process of making a cutter foil for dry shaving apparatus Download PDF

Info

Publication number
US3714807A
US3714807A US00074632A US3714807DA US3714807A US 3714807 A US3714807 A US 3714807A US 00074632 A US00074632 A US 00074632A US 3714807D A US3714807D A US 3714807DA US 3714807 A US3714807 A US 3714807A
Authority
US
United States
Prior art keywords
foil
die
cutter
making
holes
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
US00074632A
Other languages
English (en)
Inventor
S Grunberger
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.)
US Philips Corp
Original Assignee
US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3714807A publication Critical patent/US3714807A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B26B19/38—Details of, or accessories for, hair clippers, or dry shavers, e.g. housings, casings, grips, guards
    • B26B19/384—Dry-shaver foils; Manufacture thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/10—Stamping using yieldable or resilient pads

Definitions

  • the invention relates to processes for making cutter foils for dry shaving apparatus.
  • the first step is pressing metal foil between a rubber cushion and a die having raised parts, so as to punch out holes, thus leaving a continuous network of bars between the holes.
  • the edges of the holes are turned over, after which the edges of the holes are ground in a plane parallel to the surface of the ion with only partial removal of the material extending above the surface of the foil.
  • the invention concerns dies for carrying out the processes.
  • bars p ce are thereby obtained, which have a cross section somewhat corresponding to a section of a torus, so that the bearing face of the cutter foil on the surface, by reason of the curvature of the bars which is present, is less and thus not so satisfactory as in the fiat ideal form.
  • each raised part consists of two superimposed portions between which is a step-like offset, the end portion having a height at least equal to the thickness of the foil; and the process comprises a single operation of pressing the die and the cushion together with the foil between them, which causes the end portion of each raised part to punch a hole in the foil, as a first step, and directly thereafter causes the base portion to turn over the edge of the hole, as a second step.
  • FIG. 1 shows in perspective view parts of a die, the metal foil and the rubber cushion, before the punching and turning-over operation;
  • FIG. 2 shows in cross section the first step, and FIG. 3 the second step of the unitary working process
  • FIG. 4 shows in perspective the cutter foil produced
  • FIG. 5 shows in cross section a variation of the die of FIG. 1;
  • FIG. 6 shows, likewise in cross section, a further variation of the die.
  • FIG. 1 there is a die designated 1, a metal foil 2 which is to be operated on to produce a cutter foil, and a rubber cushion 3.
  • the rubber cushion is pressed down in the direction of the arrow 4, so that the die, with raised parts or projections 5, punches holes in the metal foil, and in the same operation turns over the hole edges.
  • the edges of the holes are then ground in a plane parallel to the surface of the foil with only partial removal of the material extending from the plane of the foil, after which the cutter foil is substantially ready.
  • the raised parts 5 have two portions 6 and 7, namely a base portion or first part 7 and an end portion or second part 6, between which is a step-shaped offset 8.
  • both portions 6 and 7 are cylindrical, while the diameter of the cylinder 6 is smaller than that of the cylinder 7.
  • the offset 8 here consists of a fiat surface parallel to the base surface 9 of the dies base member 9'.
  • the holes in the metal foil are punched out by the end portions 6 of the die, while the bars 10 which form a continuous network come to lie between the portions 6, as shown in FIG. 2.
  • the cut-out hole parts 11, which form waste, remain for the time being on the top face of the portions 6.
  • the height h of the portions 6 is preferably, as shown, larger than the thickness d of the metal foil, so that the punching out is completed, before the second step of this operation begins.
  • the second step of the operation namely the turning over the edges of the holes. Since, during this second step, the foil can only yield in the areas between the base portions 7 of the die, the bars 10 are pressed down to the base surface 9 of the die, while the base portions 7 have the effect that the edges of the holes on the bars are turned over, as shown in FIG. 3. In this last step, however, only a deformation of the bars 10 occurs. This guarantees that the foil material can fit the shape of the die well, so that a shape of bar is achieved, which satisfies the requirements already mentioned, namely, with a small width b of the bar, sharply bent turned over edges and a large fiat engaging surface 12 for the face are produced.
  • FIG. 4 shows the cutter foil obtained in this Way. In addition to this stamping and bending over process, the cutter foil is then ground.
  • the height k of the base portions 7, less the thickness of the foil is smaller than half the difference between the clear width a measured at the free ends, and the clear Width b measured at the bases, between adjacent raised parts.
  • the result thereby achieved is that the bent over edges of the holes extend with their free ends above the base portions 7, so that it is with certainty guaranteed that the foil material properly fills the shape of the die in the area of the base portions 7, and thus a particular minimum height of bent over hole edges is always produced. Furthermore this guarantees that the perforated cutter foil can be easily removed from the die, since the free ends of the bent over edges of the holes cannot fit tightly on the die itself.
  • the clear width b measured between the bases of adjacent raised parts is larger than half the clear width a between the free ends of the latter, but is smaller than the whole clear width a between the same free ends less the thickness d of the metal foil.
  • both portions 6, 7 of each raised part 5 are constituted by a truncated cone.
  • the semi-vertical angle a amounts to less than 20.
  • the offset 8 includes a surface of a truncated cone with a semivertical angle 5 of more than 40.
  • the transition from the portion 7 to the offset 8 and from the latter to the portion 6 is at the same time rounded off, as indicated by the radii r.
  • the transition from the base surface 9 to the portions 7 can also be rounded off.
  • Such a die can be relatively easily made, for example by spark erosion or a sand blast process.
  • FIG. 6 a die shape is shown, in which only the portions 7 are made in the shape of a truncated cone, while the portions 6 consist of cylinders.
  • This oifers the advantages, that in the first step there is absolutely exact punching, and in the second step the foil fits the shape of the die well, while the cutter foil is easily removed from the die.
  • the offset 8 is, in this example, formed by two parts of toroidal surfaces, running into one another, as is indicated by the radii R.
  • the process according to the invention may be used in making cutter foils, with other than circular holes, e.g. diamonds, pentagons or the like, for which purpose only the raised parts 5 of the die have to have the corresponding circumferential shape.
  • a die according to claim 1 in which at least one of the portions of each raised part is in the shape of a truncated cone with a semi-vertical angle of less than 20.
  • a die according to claim 1 in which one or both of the transitions between the portions and the oifset is rounded.
  • a die for making a dry shaver cutter foil having thickness d and having apertures therethrough, the edge of each aperture being rolled over comprising: a base with a working surface, at least two projections extending generally normal from said working surface, each projection comprising a first part having first diameter and extending outward from said surface by an amount defining a first height k and a second part having a second diameter smaller than the first diameter and extending outward from said first part by an amount defining a second height b the transition area between said first and second parts defining a step-like offset, wherein h is at least as great as d.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Dry Shavers And Clippers (AREA)
  • Punching Or Piercing (AREA)
  • Cell Electrode Carriers And Collectors (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
US00074632A 1969-09-25 1970-09-23 Process of making a cutter foil for dry shaving apparatus Expired - Lifetime US3714807A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT908969A AT296732B (de) 1969-09-25 1969-09-25 Verfahren zum Herstellen von Scherfolien für Trockenrasierapparate und Matrize für die Ausübung dieses Verfahrens

Publications (1)

Publication Number Publication Date
US3714807A true US3714807A (en) 1973-02-06

Family

ID=3611113

Family Applications (1)

Application Number Title Priority Date Filing Date
US00074632A Expired - Lifetime US3714807A (en) 1969-09-25 1970-09-23 Process of making a cutter foil for dry shaving apparatus

Country Status (16)

Country Link
US (1) US3714807A (de)
JP (1) JPS4949579B1 (de)
AT (1) AT296732B (de)
BE (1) BE756135A (de)
CH (1) CH513700A (de)
DE (1) DE2041159C3 (de)
DK (1) DK125963B (de)
ES (2) ES383827A1 (de)
FR (1) FR2062563A5 (de)
GB (1) GB1285549A (de)
IE (1) IE34541B1 (de)
LU (1) LU61696A1 (de)
NL (1) NL7013966A (de)
NO (1) NO128698B (de)
SE (1) SE352254B (de)
ZA (1) ZA706434B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5398533A (en) * 1994-05-26 1995-03-21 General Motors Corporation Apparatus for piercing hydroformed part
EP2047957A1 (de) * 2006-10-13 2009-04-15 Panasonic Electric Works Co., Ltd Aussenklinge für einen schwingungselektrorasierer und verfahren zu seiner herstellung
CN102781636A (zh) * 2010-03-26 2012-11-14 松下电器产业株式会社 电动剃毛器
US20180243930A1 (en) * 2017-02-24 2018-08-30 Panasonic Intellectual Property Management Co., Ltd. Method of producing outer blade for hair cutting device, outer blade for hair cutting device and hair cutting device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3042483A1 (de) * 1980-11-11 1982-06-16 Philips Patentverwaltung Gmbh, 2000 Hamburg Verfahren und anordnung zur herstellung einer duesenplatte fuer tintenstrahlschreibwerke

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT228605B (de) * 1961-06-16 1963-07-25 Verfahren und Matrize zur Herstellung von Scherfolien für Trockenrasierapparate und danach hergestellte Scherfolie

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5398533A (en) * 1994-05-26 1995-03-21 General Motors Corporation Apparatus for piercing hydroformed part
EP2047957A1 (de) * 2006-10-13 2009-04-15 Panasonic Electric Works Co., Ltd Aussenklinge für einen schwingungselektrorasierer und verfahren zu seiner herstellung
US20100162568A1 (en) * 2006-10-13 2010-07-01 Panasonic Electric Works Co., Ltd. Outer blade for reciprocation-type electric shaver and method of producing the same
EP2047957A4 (de) * 2006-10-13 2010-11-17 Panasonic Elec Works Co Ltd Aussenklinge für einen schwingungselektrorasierer und verfahren zu seiner herstellung
US8104181B2 (en) 2006-10-13 2012-01-31 Panasonic Electric Works Co., Ltd. Outer blade for reciprocation-type electric shaver and method of producing the same
CN102781636A (zh) * 2010-03-26 2012-11-14 松下电器产业株式会社 电动剃毛器
EP2554340A1 (de) * 2010-03-26 2013-02-06 Panasonic Corporation Elektrischer rasierapparat
EP2554340A4 (de) * 2010-03-26 2013-08-21 Panasonic Corp Elektrischer rasierapparat
CN102781636B (zh) * 2010-03-26 2015-08-19 松下电器产业株式会社 电动剃毛器
US9186803B2 (en) 2010-03-26 2015-11-17 Panasonic Intellectual Property Management Co., Ltd. Electric shaver
US20180243930A1 (en) * 2017-02-24 2018-08-30 Panasonic Intellectual Property Management Co., Ltd. Method of producing outer blade for hair cutting device, outer blade for hair cutting device and hair cutting device
US10836058B2 (en) * 2017-02-24 2020-11-17 Panasonic Intellectual Property Management Co., Ltd. Method of producing an outer blade for a hair cutting device

Also Published As

Publication number Publication date
ES386550A1 (es) 1973-03-16
LU61696A1 (de) 1971-01-18
DE2041159C3 (de) 1982-03-04
NO128698B (de) 1974-01-02
ES383827A1 (es) 1973-03-01
DE2041159B2 (de) 1981-06-25
DE2041159A1 (de) 1971-04-01
NL7013966A (de) 1971-03-29
ZA706434B (en) 1971-05-27
IE34541L (en) 1971-03-25
AT296732B (de) 1972-02-25
IE34541B1 (en) 1975-06-11
DK125963B (da) 1973-05-28
BE756135A (fr) 1971-02-15
JPS4949579B1 (de) 1974-12-27
CH513700A (de) 1971-10-15
FR2062563A5 (de) 1971-06-25
SE352254B (de) 1972-12-27
GB1285549A (en) 1972-08-16

Similar Documents

Publication Publication Date Title
DE60204973T2 (de) Verfahren zur herstellung einer innenklinge für einen elektrischen rasierapparat
US3277764A (en) Apparatus for working corrugated board or the like
US3714807A (en) Process of making a cutter foil for dry shaving apparatus
GB2116093A (en) Transforming the cross-section of a metal band
US3792523A (en) Process of making a cutter foil for dry shaving apparatus
US3052139A (en) Method of making steel rule blanking die
US2323949A (en) Process of making dies
JPH07223028A (ja) パイプ材の穿孔装置
JP2877962B2 (ja) アクスルケース側板の製法
JPH06226554A (ja) 刃体の製造方法
US2529088A (en) Method of making one-piece angular frame members
US3000251A (en) Die and method of making same
JP4038273B2 (ja) 研削板の製造方法
KR970006856B1 (ko) 브레이크 슈우 리브들 및 그 성형 방법
US4448055A (en) Method to manufacture pole pieces for dynamo electric machine, and so-made pole piece
US3221390A (en) Method and apparatus for forming cages for roller bearings
US4191123A (en) Method of shaping a screw type clamping collar
GB2102707A (en) Manufacture of anti-slip decking
JPS6252648B2 (de)
EP0864384A2 (de) Verfahren zum Stanzen von Metallteilen mit hohem Endbearbeitungsgrad
JPH0785814B2 (ja) 研削板の製造方法
US1942324A (en) Scissors and method of manufacturing the same
JPH05245548A (ja) プレス型
JPH07275963A (ja) 加工材のプレス成形方法
SU593780A1 (ru) Способ изготовлени пластин конденсатора