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`Searching PAJ
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`i/i ”3-3)
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`PATENT ABSTRACTS OF JAPAN
`
`wmmwwwfiwwwmm.
`
`(43)Da’ce of publication of application : 11104.1 999
`WmmWWWMM—M
`WWWWWW =
`
`(i 1)Publioation number :
`
`11~099288
`
`(51)intCi
`
`
`
`B268 19/00
`
`
`
`(ZTDApplioation number: 10471935
`
`(7i)Applicant MATSUSHITA ELECTRIC WORKS
`LTD
`
`(223‘Date of filing :
`
`“3.08.1998
`
`(?2)Inventor : KAWAHARA MANABU
`TAKEGAWA YOSHINOBU
`FURUICHE TAKESHI
`KOZAI TAKASHI
`TANAHASHI MASAO
`
`
`(30)Priority
`
`Priority date' 28.07. 1997
`Priority number: 09201124
`
`
`Priority country.' JP
`
`(54) OUTER BLADE OF ELECTRIC RAZOR AND MANUFACTURE THEREOF
`
`(573Abstraot:
`PROBLEM TO BE SOLVED: To meet a plenty of
`requirements made for an outer blade at a high level.
`SOLUTION: A iower part of a side wail on the side of a
`blade hole 2 in a slat i surrounding the blade hole 2 is
`protruded to the side of the blade hoie 2 to make a side
`
`protrusion part 10 forming an edge tip and an upper part
`of the side weli forms a curved part H with an circuiar
`are—shaped cross section. The top surface of the curved
`part i 3 sticks out from an extension on the side of the
`
`top surface of the side protrusion part it). The
`dimension A up to the boundary between the side
`protrusion part 10 and the curved part ‘li From the top
`surface of the slat 1
`is almost equal to or less than the
`thickness (t) of the siat 1. The angle of the edge tip can
`be set by the side protrusion part 10 and the protrusion
`of skin from the blade hoie 2 can be by the curved part
`11. The boundary position between the side protrusion
`part 10 and the curved part 11 is provided near the top
`surface of the plat i to make the blade T thinner.
`
`
`
`http://wwwi 9.ipdi.inpit.go._ip/PAi /resuit/detail/main/wAAAZJai2zDA41 1099288P...
`
`2008/04/30
`
`

`

`wumwmwmwvwwwwmmmmmWWWM~WMWWWWWWWW,WmWMW
`
`CLAIMS
`
`[Claim(s)]
`
`[Claim 1]The side-attachment-wali
`
`lower part by the side of a blade hole of a
`
`crosspiece surrounding a biade hole is a side height which projects to the biade hole
`
`side and forms the edge of a blade, An outer blade of an electric shaver which a side
`
`wall upper portion is an arc shaped cross section curved part, and the curved part
`upper surface projects up rather than the upper surface side extension wire of a
`
`side height, and is characterized by a size from the upper surface of a crosspiece to
`
`a boundary between the above—mentioned side height and a curved part being
`almost the same as thickness of a orosspiece, or having become the following
`
`[Claim 2]An outer blade of the electric shaver according to claim i, wherein a hollow
`
`is established in the back side of a curved part.
`
`{Claim 3]An outer blade of the electric shaver according to claim 1 or 2, wherein a
`hollow is provided between both—sides curved parts of the upper surface of a
`
`crosspiece.
`
`l
`
`[Claim 4]An outer blade of the electric shaver according to claim 3, wherein a hollow
`
`is formed as a curving surface which leads to a curved part smoothly.
`[Claim 5]An outer blade of-an eieotrio shavervgiven in one paragraph of claims 1-4
`
`making thin thickness of an upper surface center part of a cross‘piece,
`
`[Claim 6]An outer blade of an electric shaver given in one paragraph of claims l~5
`
`having provided selectively a blade hole surrounded by a orosspiece provided with a
`
`side height and a curved part.
`
`[Claim 7]An outer biade of the electric shaver according to claim 6, wherein contact
`
`pressure with skin has established a blade hole surrounded by a crosspiece provided
`
`with a side height and a curved part only in area which becomes high.
`
`[Claim 8]An outer blade of an electric shaver given in one paragraph of claims 1-77
`currently changing selectively a projection amount of a side height, or a curvature
`
`radius of a curved part.
`
`[Claim 9]In carrying out an opening, a blade hoie which ********s a raw material
`
`which is sheet metal with a pair of metallic mold, forms unevenness, grinds heights
`
`by the side of one side, and is surrounded by a crosspiece as a pair of metallic mold,
`
`Forge coining of the raw material
`
`is carried out between an edge of a hollow, and
`
`heights using a metallic mold which established a crevice in a portion which forms
`
`the top upper surface side of a orosspiece, and a metallic mold which formed heights
`
`

`

`in a portion which forms the top undercurface side of a crosspieoe, A manufacturing
`
`method of an outer blade of an electric shaver forming a side height which projects
`
`at the blade hole side in the side-attachment~wall lower part by the side of a blade
`
`hole of a orosspiece surrounding a blade hole, and forms the edge of a blade, and
`
`forming an are shaped cross section curved part in a side wall upper portion.
`
`[Claim “HA manufacturing method of an outer blade of the electric shaver
`
`according to claim 9 performing a forge which makes thickness of an upper center
`
`part of a crosspiece thinner than raw material thickness between a hollow center
`
`section and a heights center section of the metallic mold of another side of one
`
`metallic mold.
`
`[Claim 113A manufacturing method of an outer blade of the electric shaver
`
`according to claim 9 or 10 usually performing coining by making portions other than
`
`a forge coining part into a coining part.
`
`
`
`
`
` WRWV ‘ , wwmm-mmawsvnwmmmmmwwwwwmmmmmmwmwmmwmmmw
`
`DETAILED DESCRIPTION
`WMWMWWWWW.MWWWWWWmmwmvmaymmmwmm:uMWWWWWrMmMWmmmmWWWW
`
`[Detailed Description of the Invention]
`
`[0001}
`
`[Field of the InventionJThis invention relates to the outer blade and manufacturing
`
`method of the type called the outer blade of an electric shaver, and the mesh cutter
`
`with which many blade holes were especially formed in the thin plate blank.
`[0002]
`
`'
`
`[Description of the Prior ArtJAs an outer blade of an electric shaver, as shown in
`
`drawing 20, many unevenness is formed in the raw material M which is sheet metal
`
`by coining by a pair of metallic molds 3 and 4, Subsequently, although there are
`
`some which made the portion which remains while breaking the blade hole 2, as
`shown in drawing 19 by grinding the portion (it is a field below the line C in a figure)
`
`projected to the one side side the crosspiece l surrounding the blade hole 2, In this
`
`case, the grinding side in the crosspiece 1 serves as the edge of a blade of the knife
`
`angle theta. and the mustache 6 introduced from the blade hole 2 will be out
`
`because an inner blade ****s to this field.
`
`[0003}At this time, it is difficult to make a relation with the opening diameter D of
`
`the knife angle theta and the blade hole 2 into a satisfying thing in the
`
`above~mentioned coining processed so that the thickness t may hardly change from
`
`raw material thickness in each part. Namely, although what is necessary is just to
`
`

`

`make the knife angle theta small for raising sharpness, in this case, since the
`
`projection amount P of the skin 5 from the blade hole 2 becomes large. only the part
`
`to which height (edge thickness) T of the crosspiece 3 becomes it low that it is the
`
`same in the opening diameter D. From having to make small the opening diameter D
`
`of the blade hole 2., and also the geometric moment of inertia of the crosspiece 1
`
`becoming small, the section of the crosspiece i must also be enlarged for intensity
`
`reservation, the numerical aperture of the blade hole 2 “Falls as a result, and
`
`introduction of the mustache 6 worsens.
`
`[OOD4]Conversely, if the numerical aperture of the blade hole 2 tends to be enlarged
`
`and it is going to improve introduction of the mustache 6, the knife angle theta will
`
`be enlarged, and since the slitting resistance to the mustache 6 becomes large,
`
`sharpness will get worse. When enlarging the knife angle theta, making width of the
`
`crosspiece i the same, the curvature radius of the upper surface corner of the
`
`crosspiece i must be made small, and this will cause aggravation per skin.
`
`[0005]For this reason, what made the knife angle small by drawing the curve on
`
`which the section of the side attachment wall surrounding [ as shown in drawing 21 :l
`
`the blade hole 2 of the crosspieoe 1 has the point of inflection on JP,54-l3793,U is
`
`proposed, What made the knife angle email by making a curve draw on the lower end
`
`part which is an edge-of—a—blade side of the above-mentioned side attachment wall
`
`as shown in drawing 22 is preposed by JP,55~68973,U.
`
`[0006]
`
`[Problem(s) to be Solved by the inventionJHowever, each thing shown in the two
`
`above~mentioned gazettes from being premised on said processing method for
`
`********ing without changing raw material thickness as much as possible. When
`
`made from the stainless steel cutting steel material by which normal use is carried
`
`out, it cannot fabricate, if edge thickness T is not made quite thicker (i .5 or more
`" times) than the thickness t, And lncreaseof the edge thickness T causes the
`problem that a mustache cannot be shaved short, and if thickness t (raw material
`
`thickness) is made thin in order to prevent this, it will cause a strong fall.
`
`[0007]In view of such a point, it succeeds in this invention, and the place made into
`
`the purpose is to provide the outer blade of the electric shaver which satisfies many
`
`points for which an outer blade is asked to a high level, The place made into other
`
`purposes is to provide the manufacturing method of the outer blade of the electric
`
`shaver which can manufacture the above—~mentioned outer blade simple.
`
`[00083
`
`{Means for Solving the ProblemJAn outer blade of an electric shaver which carries
`
`

`

`out a deer and is built over this invention, The side—attachment-wall lower part by
`
`the side of a blade hole of a crosspiece surrounding a blade hole is a side height
`
`which projects to the blade hole side and forms the edge of a blade, A side wall
`
`upper portion is an arc shaped cross section curved part, the curved part upper
`
`surface projects up rather than the upper surface side extension wire of a side
`
`height, and it has the feature for a size from the upper surface of a orosspiece to a
`
`boundary between the above-mentioned side height and a curved part to be aimost
`
`the same as thickness of a crosspiece, or have become the following. It is made to
`
`end even if it does not thicken edge thickness by enabiing it to set up a projection
`
`amount of skin from a biade hoie by a curved part, and providing a boundary position
`
`of the above-mentioned side height and a curved part near the upper surface of a
`
`crosspieoe. while setting up a knife angle by a side height.
`
`[0009]A hollow may be established in the back side of a curved part, or a hollow may
`
`be provided between both-sides curved parts of the upper surface of a crosspieoe.
`
`It can sizeecome and a projection amount of a curved part can be come. At this
`
`time, if a hoilow is made into a curving surface which leads to a curved part
`
`smoothly, it can make per skin still better.
`
`[0010]Thickness of an upper surface center part of a crosspiece may be made thin.
`
`[00111As for a blade hoie surrounded by a crosspiece which could establish a biade
`
`hole surrounded by a crosspiece provided with a side height and a curved part in the
`
`whoie region, but couid provide selectiveiy, and was provided with a side height and
`
`a curved part in this case, it is preferred that contact pressure with skin provides
`
`oniy in area which becomes high.
`
`[0012}It is also preferred to change selectively a projection amount of a side height
`
`or a curvature radius of a curved part.
`
`[0013]And a manufacturing method of an outer blade of an electric shaver in this
`
`invention, In carrying out an opening, a blade hole which ********s a raw material
`
`which is sheet metal with a pair of metallic moid, forms unevenness, grinds heights
`
`by the side of one side, and is surrounded by a crosspiece as a pair of metallic mold,
`
`Forge coining of the raw material is carried out between an edge of a hollow, and
`
`heights using a metallic mold which estabiished a crevice in a portion which forms
`
`the top upper surface side of a crosspiece. and a metallic mold which formed heights
`
`in a portion which forms the top undersurface side of a crosspiece, It has the
`
`feature to form a side height which projects at the biade hole side in the
`
`side—attachment—wail lower part by the side of a biade hoie of a crosspiece
`
`surrounding a biade hole, and forms the edge of a blade, and form an are shaped
`
`

`

`cross section curved part in a side wali upper portions An outer blade of said eiectrio
`
`shaver can be easiiy obtained by forge coining.
`
`[0014]At this time, it is also preferred to perform a forge which makes thickness of
`
`an upper center part of a crosspiece thinner than raw material thickness between a
`
`hollow center section and a heights center section of the metaliic mold of another
`side of one metaliic moid.
`
`{00i53Portions other than a forge coining part may usualiy perform coining as a
`
`coining part.
`
`{0&6}
`
`[Embodiment of the lnventionhf an exampie of an embodiment of the invention is
`
`expiained, as shown in drawing; 1, the fundementai gestait is the same as said
`conventional example, but the iower part of the side attachment wali by the side of
`
`the blade hole 2 in the crosspiece i surrounding the biade hoie 2 is used as the side
`
`height 10 which forms the edge of a biade of the knife angle theta, and the upper
`part of the above~mentioned side attachment well is made into the curved part 11
`
`of the curvature radius R. The curved part ii should have projected only the fine
`
`amount delta rather than the extension wire by the side of the upper surface of the
`side height 10, Furthermore, it is the same as the top thickness (raw'material
`
`thickness) t of the crosspiece 1, distance A from the boundary point of the side
`
`height 10 and the curved part ii to the upper surface of the crosspiece i
`
`is made
`
`into iess than it (A<=t}, and minimum thickness W is made smaiier (W<t) than the raw
`
`materiai thickness t.
`
`[OOiYEAs shown in drawing 2. whiie such an outer biade is provided with the heights
`
`40 and the crevice 30 as a pair of metaiiic maids 3 and 4, respectively and forms the
`
`upper part of the crosspiece 1 among both 40 and 30, the boundary point of the side
`height 10 and the curved part ii using what is formed by the edge of the crevice 30
`
`A'Fter forge coining of the raw material M, It obtains by grinding the portion below the
`line C.
`
`[00183Although the knife angle theta of the edge of a blade formed of the side height
`
`10 is small, Since the projection amount of skin can be greatiy made smaii very
`
`much for the opening diameter D since the curved part H has projected only the
`
`value delta rather than the side height 10, and edge thickness T can be made [ and 3
`
`small near the thickness t, the mustache has been shaved short.
`
`[€301 QJDrawing 3 (a) shows what made edge thickness T stiii smaller as compared
`
`with what was shown in drawing i, and drawing 3 (b) shows that to which drawing 3
`
`(0) both made small the edge thickness T and the projection amount delta for what
`
`

`

`enlarged the curvature radius R of the curved part i1 as compared with what was
`
`shown in drawing 1, and made the projection amount delta small. Although per skin
`
`can be improved by being able to shave a mustache shorter, being able to raise it
`with making edge thickness T still smaller, enlarging the curvature radius R, and
`
`making the projection amount delta small. if the opening diameter D is not made
`
`smaller than what was shown in drawing 1, the projection amount of skin will become
`
`large anyway.
`
`[OOZOIOther examples are shown in drawing 4. This forms the crevice 13 of the level
`
`‘ difference h1 in'the rear-face side of the curved part 11 of the crosspiece 1 using
`
`what equipped the periphery of the heights 40 with the projected rim 41 as the
`
`metallic mold 4. in order that existence of this crevice 13 may swell the curved part
`
`11 outside and may enlarge the projection amount delta, only the part which can
`
`stop the projection amount of skin further can enlarge the opening diameter D of the
`
`blade hole 2, and it can improve it mustached introduction. Edge thickness T is made
`
`thin. and a mustache is shaved still shorter and it can make it possible to raise it.
`
`[0021:lin what is shown in drawing 5, in addition to formation of the crevice 13 by the
`
`metallic mold 4 shown in above—mentioned drawing 4, the projection 31 is formed in
`
`. the crevice 30 center of the metallic mold 3, and the hollow 12 of the level
`
`difference h2 is formed in the upper surface center part of the crosspiece 1. Since
`
`the projection amount delta of the curved part 11 will be enlarged too and also the
`
`skin 5 is lengthened on the occasion of shaving in this hollow 12, such existence of
`
`the hollow 12, The projection amount of the skin 5 from the blade hole 2 can be
`
`made small, and since the mustache 6 is pressed out from a root because the
`
`curved part 11 presses down more roots of the mustache 6. the mustache 6 can be
`
`out more short.
`
`[00221The above~mentioned crevice 13 may be trapezoidal shape as shown in
`
`drawing 6, or as shown in drawing 7‘, it may make the too undercurfaoe of the
`
`crosspiece 1 a curving surface. As shown in drawing 7 as for a hollow 12. the upper
`
`surface of the crosspiece 1 may be made into a curving surface. Being able to make
`
`high endurance to cruel use of metallic molds 3 and 4 called forge coining in any
`
`case, formation of the hollow 12 which is a curving surface Further will improve per
`skin.
`
`[OOZCEJhc the forge which makes top thickness of the crosspiece 1 thinner than the
`
`raw material thickness t when forming the hollow 12 is performed as shown in
`
`drawing 8 or drawing 9, the projection amount delta of the curved part 11 can be
`
`increased effectively. The tapered shape hollow 12 shown in drawing 9 can improve
`
`

`

`the endurance of the metallic molds 3 and 4 which perform forge coining whose load
`
`is size, in order that the welding pressure between the metallic molds 3 and 4 may
`
`be small and may end.
`
`[0024JA5 shown in drawing 10, even if the hollow i4 is established in the center
`
`section by the side of the top undersurface of the orossoiece l and only the level
`
`difference h is made to make thin thickness of the upper center part of the
`
`crosspisoe i from the raw materiai thickness t, the projection amount delta of the
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`curved part ii can be enlarged too. The burden pieced on the metallic molds 3 and
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`4 can be made smali by making the hollow 14 into tapered shape. Drawing ii shows
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`the thing it enabled it to take large increase of the projection amount delta of the
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`curved part ii as compared with the edge thickness T while the hollow i4 is formed
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`with the crevice 13 and the hollow 12 and only the level difference h3 makes
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`thickness thinner than the raw material thickness t.
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`[0025]By the way, it is not necessary to perform forming the side height 10 and the
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`curved part ii to all the fields in which the blade hole 2 in an outer blade was
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`established also from a point of the endurance of the metallic molds 3 and 4 in the
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`case of forming by forge coining. The outer blade A used for the both~way formula
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`electric shaver shown in drawing 12 about this point explains.
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`[0026]While the both-way formuia electric shaver shown in drawing 12 is provided
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`with the blade heads Ha of a couple, Ha, and the d