US3714807A - Process of making a cutter foil for dry shaving apparatus - Google Patents
Process of making a cutter foil for dry shaving apparatus Download PDFInfo
- 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
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)
- Cell Electrode Carriers And Collectors (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Punching Or Piercing (AREA)
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 (es) |
JP (1) | JPS4949579B1 (es) |
AT (1) | AT296732B (es) |
BE (1) | BE756135A (es) |
CH (1) | CH513700A (es) |
DE (1) | DE2041159C3 (es) |
DK (1) | DK125963B (es) |
ES (2) | ES383827A1 (es) |
FR (1) | FR2062563A5 (es) |
GB (1) | GB1285549A (es) |
IE (1) | IE34541B1 (es) |
LU (1) | LU61696A1 (es) |
NL (1) | NL7013966A (es) |
NO (1) | NO128698B (es) |
SE (1) | SE352254B (es) |
ZA (1) | ZA706434B (es) |
Cited By (4)
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 (en) * | 2006-10-13 | 2009-04-15 | 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 |
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)
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)
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 |
-
0
- BE BE756135D patent/BE756135A/xx unknown
-
1969
- 1969-09-25 AT AT908969A patent/AT296732B/de not_active IP Right Cessation
-
1970
- 1970-08-19 DE DE2041159A patent/DE2041159C3/de not_active Expired
- 1970-09-10 NO NO03460/70A patent/NO128698B/no unknown
- 1970-09-16 LU LU61696D patent/LU61696A1/xx unknown
- 1970-09-18 SE SE12736/70A patent/SE352254B/xx unknown
- 1970-09-21 IE IE1220/70A patent/IE34541B1/xx unknown
- 1970-09-21 ES ES383827A patent/ES383827A1/es not_active Expired
- 1970-09-21 ZA ZA706434A patent/ZA706434B/xx unknown
- 1970-09-22 NL NL7013966A patent/NL7013966A/xx unknown
- 1970-09-23 US US00074632A patent/US3714807A/en not_active Expired - Lifetime
- 1970-09-23 FR FR7034520A patent/FR2062563A5/fr not_active Expired
- 1970-09-23 CH CH1407370A patent/CH513700A/de not_active IP Right Cessation
- 1970-09-24 DK DK488370AA patent/DK125963B/da unknown
- 1970-09-24 GB GB45622/70A patent/GB1285549A/en not_active Expired
- 1970-09-25 JP JP45084023A patent/JPS4949579B1/ja active Pending
- 1970-12-17 ES ES386550A patent/ES386550A1/es not_active Expired
Cited By (12)
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 (en) * | 2006-10-13 | 2009-04-15 | Panasonic Electric Works Co., Ltd | Outer blade for reciprocation-type electric shaver and method of producing the same |
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 (en) * | 2006-10-13 | 2010-11-17 | Panasonic Elec Works Co Ltd | EXTERNAL BLADE OF AN ANIMATED ELECTRIC RAZOR OF A GO-AND-VIENT MOVEMENT AND METHOD FOR PRODUCING THE SAME |
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 (en) * | 2010-03-26 | 2013-02-06 | Panasonic Corporation | Electric shaver |
EP2554340A4 (en) * | 2010-03-26 | 2013-08-21 | Panasonic Corp | ELECTRIC RAZOR |
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 |
---|---|
JPS4949579B1 (es) | 1974-12-27 |
NO128698B (es) | 1974-01-02 |
DE2041159B2 (de) | 1981-06-25 |
DE2041159A1 (de) | 1971-04-01 |
ES386550A1 (es) | 1973-03-16 |
CH513700A (de) | 1971-10-15 |
IE34541L (en) | 1971-03-25 |
BE756135A (fr) | 1971-02-15 |
SE352254B (es) | 1972-12-27 |
GB1285549A (en) | 1972-08-16 |
DE2041159C3 (de) | 1982-03-04 |
IE34541B1 (en) | 1975-06-11 |
LU61696A1 (es) | 1971-01-18 |
NL7013966A (es) | 1971-03-29 |
FR2062563A5 (es) | 1971-06-25 |
DK125963B (da) | 1973-05-28 |
ES383827A1 (es) | 1973-03-01 |
AT296732B (de) | 1972-02-25 |
ZA706434B (en) | 1971-05-27 |
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