US3742603A - Reticulate foil and its aperture shape for electric dry shaver - Google Patents

Reticulate foil and its aperture shape for electric dry shaver Download PDF

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Publication number
US3742603A
US3742603A US00066516A US3742603DA US3742603A US 3742603 A US3742603 A US 3742603A US 00066516 A US00066516 A US 00066516A US 3742603D A US3742603D A US 3742603DA US 3742603 A US3742603 A US 3742603A
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United States
Prior art keywords
aperture
foil
hair
reticulate
electric dry
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Expired - Lifetime
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US00066516A
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English (en)
Inventor
G Yamaoka
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Suwa Seikosha KK
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Suwa Seikosha KK
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Publication date
Application filed by Suwa Seikosha KK filed Critical Suwa Seikosha KK
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Publication of US3742603A publication Critical patent/US3742603A/en
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    • 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

Definitions

  • the reticulate foil for an electric dry shave! is composed ofv thin metal having many haircuttir g apertures. Said foil introduces a hair and cuts it i boperatien with t i r a Th s, the u ctien o an fo i the mo f am n al f r h ving and determines the shaving efficiency.
  • the main elements construction of said foil, which determines the shaving efficiency, are as follows;
  • the opening ratio is increased by means of suitable shape and size of the cutting aperture and method of its arrangement as stated above: Therefore, a hair is introduced into the aperture very fast, it being advantageous that the hair only is inserted deeply into, the aperture by means of a special Putt n pe ture s apewo ld t u e Po ible t shave. without injuring the skin by the inner blade.
  • POint of the invention intends to for ch-type eonvexity respectively at the inner hree points which divide the aperture into. equal parts, and arrange those apertures in such. a manner that the bridge width of the reticulate foil: is constant.
  • FIG. I shows the most favorable and effective aper-v u e s ap ccording
  • FIG. 2 is a sectional view showing themost effectivearrangementof the apertures, the shape of which ishqwn n F G- FIG, 3; shows the part of thearrangement of the circular aperture shapes which are the most popular shapes at present;
  • FIG. 4 shows, part of the arrangement. of the hexagonal apertures. shown in.U.S. Pat. No. 3,093,899;
  • FIG. 5 is asectional view showing that the skin also enters ina conventionalcutting aperture together with a hair;
  • FIG. 6 is a cross sectional view showing that'only: a. hair enters into a cutting aperturein accordance. with.
  • FIG. 1 concrete apertureshape is shown. in FIG. 1, its arrangement being. shown in FIG. 2.
  • the apertures have threearch-type convexities and are. arranged. so that the, bridge width. 3 between; the apertures harev kept constant.
  • the arrangement is such that the bridge width 3 between the apertures is kept constant and to arrangethe cutting apertures most effectively on the foil. Also, said arrangement is the fundamental element necessary to increase the opening ratio of the foil. Therefore the cutting efficiency is heightened and the hair is inserted more quickly because of said arrangement.
  • the constant width of the foil bridges assures the same strength over the entire surface of the foil, so that while the opening ratio is high, the foil is strong.
  • the circular aperture shape shown in FIG. 3, is in Wide use at the present time.
  • the bridge width 6 of said circular aperture is low.
  • the hexagonal aperture shown in U.S. Pat. No. 3,093,899, makes the opening ratio higher and is the most practical.
  • the arrangement of said hexagonal aperture is shown in FIG. 4 of the invention.
  • the aperture shape and its arrangement according to the present invention provides an equal or higher opening ratio to the hexagonal aperture. Moreover, compared with the hexagonal aperture, the aperture'shape of the present invention is more efficient in cutting the hair as. short as possible without injuring the skin by the inner blade.
  • the aperture 1 is made larger and the foil is made thinner. If the-aperture is made too large or the'foil is made too thin, not only the hair but also the skin is inserted. into the aperture, as in FIG. 5 thus injuring the skin by the inner blade and reducing the shaving efficiency.
  • the present invention provides a unique aperture shape shown in FIG. 1, into "which the hair alone is deeply inserted without injuring the skin by the inner blade. The outline concerning this'aperture shape has been mentioned above, and the effectiveness; ofsaid aperture shape during shaving is explained below.
  • the circle 4 which passes three. peaks a, b, c of the convexities 2, is imagined. Considering said imaginary circle 4 as the cutting aperture, the peaks a, b, and c are arranged on said cutting.
  • size of said circle 1 l is determined so that the hairis inserted easily, and is larger than that of the circular ap erture of the foil having proper size circular apertures.
  • the-skin 12 which has been pushed out by thepeaks a, b, and c, is pushed away into the concavityz5. If the electric dry shaver is moved over the skin for shaving, the root of the hair, being pushed out, is moved in an instant to the cutting foil 13 which is shown by the thick lines in FIG. 1. The hair is then cut by said cutting foil 13 and the inner blade.
  • the universal shaver for cutting all kinds of hair can be manufactured.
  • said aperture shape can cut the hair effectively without regard to cutting direction of the hair; namely, the position of the hair in the cutting aperture, and moving direction of the inner blade.
  • the hair 7 in the aperture moves to the concavity 5 in an instant (7 after the movement), and is cut down by the foil 13 shown by the thick lines.
  • the aperture shape of the invention does not set the cutting direction, so the shaving efficiency is not affected by the moving direction of the inner blade. Therefore, the cutting efficiency is not affected because of such arrangement.
  • the angle of the edge 14 of the cutting foil 13 is comparatively small, so the hair which is inserted into the concavity 5 (for example 7') does not run away from the concavity 5.
  • the cutting foil 13 shown by the thick lines is somewhat concave. This prevents the hair from moving and also avoids injuring the skin during shaving.
  • the unique aperture shape of the invention cuts the hair shortest without injuring the skin by the inner blade. Saidaperture shape catches the hair effectively, which is introduced into the aperture,
  • the most favorable advantage of the invention i.e. the highest opening ratio provides very fast shaving, comfort and shaving efficiency in cutting the hair short without injuring the skin by the inner blade.
  • each concave arc in a given aperture must have the same center as the corresponding convex arc in the adjacent aperture. This is evident from FIG. 2. Consequently, each concave arc must be slightly larger than the convex arc in the same aperture.
  • the invention does not limit the quantity and the position of arch-type convexities 2.
  • the invention provides the excellent shaving efficiency.
  • each aperture is bounded by a total of six alternate convex and concave arcs, so arranged that the width of the bridge between adjacent apertures is essentially constant each bridge being bounded by a pair of said arcs, each said pair of said arcs consisting of one concave and one convex arc, each said pair of said arcs further having the same center of curvature.
  • each aperture has therein six corners, each of said corners being formed by the junction of a convex and a concave arc, each of said corners being adapted for lodgement of a hair therein during use of said shaver, thereby facilitating the operation of shaving.

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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)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
US00066516A 1969-09-12 1970-08-24 Reticulate foil and its aperture shape for electric dry shaver Expired - Lifetime US3742603A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44072163A JPS4948855B1 (enrdf_load_stackoverflow) 1969-09-12 1969-09-12

Publications (1)

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US3742603A true US3742603A (en) 1973-07-03

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US00066516A Expired - Lifetime US3742603A (en) 1969-09-12 1970-08-24 Reticulate foil and its aperture shape for electric dry shaver

Country Status (5)

Country Link
US (1) US3742603A (enrdf_load_stackoverflow)
JP (1) JPS4948855B1 (enrdf_load_stackoverflow)
DE (1) DE2044267B2 (enrdf_load_stackoverflow)
GB (1) GB1315317A (enrdf_load_stackoverflow)
HK (1) HK22278A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4343089A (en) * 1979-10-03 1982-08-10 Matsushita Electric Works, Ltd. Outer blade of electric shavers
US20110179648A1 (en) * 2010-01-22 2011-07-28 Panasonic Electric Works Co., Ltd. Electric shaver
US20130125401A1 (en) * 2003-11-11 2013-05-23 Panasonic Corporation Electric shaver
USD688543S1 (en) 2012-03-20 2013-08-27 Milwaukee Electric Tool Corporation Saw blade
USD729600S1 (en) 2014-05-06 2015-05-19 Milwaukee Electric Tool Corporation Saw blade
US9475141B2 (en) 2011-08-04 2016-10-25 Milwaukee Electric Tool Corporation Reciprocating saw blade

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2412099C3 (de) * 1973-03-22 1982-08-19 Matsushita Electric Works, Ltd., Kadoma, Osaka Äußeres Messerblatt des Scherkopfes eines Trockenrasiergerätes

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2198833A (en) * 1938-04-26 1940-04-30 Gillette Safety Razor Co Shaving implement
US3093899A (en) * 1959-08-19 1963-06-18 Braun Ag Improvements to the cutting heads of dry shaving apparatus
US3602991A (en) * 1967-11-18 1971-09-07 Balco Filtertechnik Gmbh Shearing foil for a dry-shaving razor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2198833A (en) * 1938-04-26 1940-04-30 Gillette Safety Razor Co Shaving implement
US3093899A (en) * 1959-08-19 1963-06-18 Braun Ag Improvements to the cutting heads of dry shaving apparatus
US3602991A (en) * 1967-11-18 1971-09-07 Balco Filtertechnik Gmbh Shearing foil for a dry-shaving razor

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4343089A (en) * 1979-10-03 1982-08-10 Matsushita Electric Works, Ltd. Outer blade of electric shavers
US20130125401A1 (en) * 2003-11-11 2013-05-23 Panasonic Corporation Electric shaver
US8806763B2 (en) * 2003-11-11 2014-08-19 Panasonic Corporation Electric shaver
US20110179648A1 (en) * 2010-01-22 2011-07-28 Panasonic Electric Works Co., Ltd. Electric shaver
US9108325B2 (en) * 2010-01-22 2015-08-18 Panasonic Intellectual Property Management Co., Ltd. Electric shaver
US9475141B2 (en) 2011-08-04 2016-10-25 Milwaukee Electric Tool Corporation Reciprocating saw blade
US10226829B2 (en) 2011-08-04 2019-03-12 Milwaukee Electric Tool Corporation Reciprocating saw blade
US12202064B2 (en) 2011-08-04 2025-01-21 Milwaukee Electric Tool Corporation Reciprocating saw blade
USD688543S1 (en) 2012-03-20 2013-08-27 Milwaukee Electric Tool Corporation Saw blade
USD723892S1 (en) 2012-03-20 2015-03-10 Milwaukee Electric Tool Corporation Saw blade
USD729600S1 (en) 2014-05-06 2015-05-19 Milwaukee Electric Tool Corporation Saw blade

Also Published As

Publication number Publication date
GB1315317A (en) 1973-05-02
DE2044267A1 (de) 1971-04-08
DE2044267B2 (de) 1975-02-27
JPS4948855B1 (enrdf_load_stackoverflow) 1974-12-24
HK22278A (en) 1978-05-05

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