JP2004166898A

JP2004166898A - Adjustable type safety razor

Info

Publication number: JP2004166898A
Application number: JP2002335299A
Authority: JP
Inventors: Hiroshi Otsubo; 博司大坪; Shigeki Yamashita; 茂樹山下
Original assignee: Kaijirushi Hamono Center KK
Current assignee: Kaijirushi Hamono Center KK
Priority date: 2002-11-19
Filing date: 2002-11-19
Publication date: 2004-06-17
Anticipated expiration: 2022-11-19
Also published as: JP4334203B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safety razor which makes a razor head adjustable smoothly without the excessive oscillation of the razor head even when the angle of the oscillation of the razor head grows larger by solving the problem in the adjustable type safety razor that the deflected oscillation force grows in proportion to an increase in angle of the oscillation of the razor head leading to the heavy oscillation of the razor head. <P>SOLUTION: In the adjustable type safety razor, the razor head 6 mounted on a holder 1 can be oscillated centering around the axis of the oscillation so that the oscillated razor head 6 receives the deflected oscillation force to be returned to the original position. An engaging surface of a cam device 15 or a cam follower joint is so formed in the safety razor as to cause a change in gradient of the increase in the deflected oscillation force obtained by dividing the deflected oscillation force in accordance with the oscillation of the safety razor by the angle of the oscillation, in the course of the oscillation. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、かみそりヘッドを揺動可能にホルダーに取り付けた首振り式安全かみそりに関する。
【０００２】
【従来の技術】
首振り式安全かみそりは、使用中に顔の凹凸に対応してかみそりヘッドが揺動する構造であって、広く利用され需要者に受け入れられている。首振り式安全かみそりで最も重要なことは、使用中にいかに滑らかにかみそりヘッドが揺動するかということである。特にかみそりヘッドの揺動角が大きくなると、それに比例するようにかみそりヘッドを元の位置に復帰させる偏向揺動力も大きくなり、かみそりヘッドの揺動が重くなるのである。そこで、かみそりヘッドのカム面に偏向揺動力を与えるカム従動節をホルダーに弾性片状に形成し、途中にこぶのように突き出た屈曲部を設けたものがある（例えば、特許文献１参照）。
【０００３】
【特許文献１】
特許第３０２８４０８号公報
【０００４】
【発明が解決しようとする課題】
前記特許文献１は、カム従動節であるプッシャーにこぶ状の屈曲部を設け、プッシャーの上下動と前後の揺動でかみそりヘッドに軟らかくバランスのよい首振り揺動を与えようとするものである。しかし、このような構成であっても、かみそりヘッドの揺動角が大きくなると、それに比例するように偏向揺動力が大きくなることに変わりはない。したがって、かみそりヘッドの揺動角の増加につれて揺動が重くなるのである。そこで、本発明は、かみそりヘッドの揺動角が大きくなったときに、そのときまで揺動角に比例するように増加する偏向揺動力の増加傾斜度を、それまでよりも小さくして偏向揺動力が同じような割合で増加しないようにするものである。これによって、かみそりヘッドの揺動角が大きくなってもかみそりヘッドの揺動が重くなることがなく、かみそりヘッドの円滑な首振りを得ることができる安全かみそりを提供することを目的とする。
【０００５】
さらには、特にカム従動節の弾性力を弱くして偏向揺動力が小さくなるように設定した安全かみそりでは、かみそりヘッドの揺動を一定の角度で止めるためのストッパーを設ける必要がある。しかし、かみそりヘッドの揺動をストッパーで止めると、揺動が急に止まるので、揺動がかみそりヘッドの後部が下がる方向に揺動しているときはヒゲを剃り残す虞がある。そこで、揺動を緩やかに止めるためにはストッパーを設けず、揺動が困難になる程度に偏向揺動力を増加させればよい。そこで、本発明は、かみそりヘッドの揺動が一杯に近づいたときに、揺動が突然止まるのではなくやや柔軟性をもって止まる安全かみそりを提供することも目的とする。
【０００６】
【課題を解決するための手段】
本発明の請求項１は、かみそりヘッドの揺動に伴なって増加した偏向揺動力をその揺動した角度で除した偏向揺動力の増加傾斜度が、揺動の途中で変化するようにカム装置又はカム従動節の係合面が形成されている構成である。増加傾斜度が揺動の途中で変化するとは、例えば、それまでの増加傾斜度に比べて８０％程度に減少するというようなはっきりした変化である。
【０００７】
請求項２は、かみそりヘッドの一方向の揺動に関し、増加傾斜度の変化時に係合するカム装置又はカム従動節の係合面はその変化時に該当する部分で屈曲している構成であり、請求項３は、変化前の揺動における偏向揺動力の増加傾斜度よりも、変化後の揺動における偏向揺動力の増加傾斜度の方が小さくなるように変化する構成である。請求項４は、変化後の揺動における偏向揺動力の増加傾斜度が、変化前の揺動における増加傾斜度の半分以下であり、請求項５は、変化後の揺動における偏向揺動力の増加傾斜度は、ほぼ０である構成である。
【０００８】
請求項６は、カム装置又はカム従動節の係合面は、変化前の揺動時に他方の係合面と係合する第１係合面と、変化後の揺動時に係合する第２係合面を有し、カム装置とカム従動節との接触点における共通接線と、前記揺動軸線を中心とし前記接触点を通る円の該接触点における接線とのなす角度を接触角度と定義して、第１係合面における接触角度よりも第２係合面における接触角度の方が小さくなるように係合面が形成されている構成である。
【０００９】
請求項７は、第１係合面における接触角度よりも第２係合面における接触角度の方が小さくなるように、両係合面の境が屈曲している構成であり、請求項８は、前記第２係合面における接触角度の絶対値がほぼ０度乃至ほぼ３０度である構成である。
【００１０】
請求項９は、ホルダーの上端に該ホルダーとほぼ直角をなすようにかみそりヘッドが取り付けられ、カム装置はかみそりヘッドの底面に設けられており、カム従動節はホルダーの上部中央から上方に延びる弾性片であり、カム従動節に形成された第１係合面及び第２係合面が前記カム装置とカム結合した要素が請求項１乃至請求項８に限定的に付加された構成である。
【００１１】
請求項１０は、係合面が弾性片の上部の背面方向にく字形に屈曲した背面に形成され、く字形の屈曲部から端部方向の背面が第１係合面であり、く字形の屈曲部から基部方向の背面が第２係合面である要素が請求項９に限定的に付加された構成であり、請求項１１は、かみそりヘッドは、該かみそりヘッドのカム装置の係合面が前記第１及び第２の係合面上を滑るように当初の位置から一方向に揺動し、且つ該揺動を規制する手段を備えている構成であり、請求項１２は、かみそりヘッドの底面からＬ字形に端部が刃先縁方向である前方を向くように突出し、該端部がカム従動節とカム係合する構成である。請求項１３は、かみそりヘッドの揺動を規制する手段は、ホルダーと一体に形成されたストッパーであって、該ストッパーは前記弾性片の両側近傍に位置している要素が請求項１１又は請求項１２に限定的に付加された構成である。
【００１２】
請求項１４は、弾性片から間隔を置いた両側近傍に凹の円弧状をなすかみそりヘッド受け面及び該かみそりヘッド受け面と一体にストッパーが形成され、かみそりヘッドの底面には凸の円弧状をなし前記かみそりホルダー受け面と面接触する凸面部が一体に形成され、これらのかみそりヘッド受け面及び凸面部はホルダーとかみそりヘッドとの結合装置と別に設けられている構成である。
【００１３】
請求項１５は、揺動途中における増加傾斜度の変化する過程を経てかみそりヘッドが揺動範囲の一杯近くまで揺動したときに、偏向揺動力の増加傾斜度がそれまでのどの増加傾斜度よりも大きくなるように変化する構成である。すなわち、増加傾斜度の変化が一度でない構成である。
【００１４】
【発明の効果】
請求項１は、かみそりヘッドの揺動に伴なって増加した偏向揺動力をその揺動した角度で除した偏向揺動力の増加傾斜度が、揺動の途中で変化するようにカム装置又はカム従動節の係合面が形成されている構成である。これによって、偏向揺動力の増加傾斜度が小さく変化する場合は、それ以上かみそりヘッドを揺動しても偏向揺動力の増加がわずかであるから、かみそりヘッドを円滑に揺動することができる。また、偏向揺動力の増加傾斜度が大きく変化する場合は、それ以上かみそりヘッドを揺動したときに偏向揺動力が大きくなって揺動を規制することができる。このことは、従来、ストッパーによってかみそりヘッドの揺動を急に停止することによってヒゲの剃り残しを生じていたが、これを効果的に防止することができる。
【００１５】
請求項２は、かみそりヘッドの一方向の揺動に関し、増加傾斜度の変化時に係合するカム装置又はカム従動節の係合面はその変化時に該当する部分で屈曲している構成である。カム装置又はカム従動節の係合面を屈曲させることによって増加傾斜度を容易に変化させることができる。請求項３は、変化前の揺動における偏向揺動力の増加傾斜度よりも、変化後の揺動における偏向揺動力の増加傾斜度の方が小さくなるように変化する構成である。この構成によって、請求項１の効果で述べたように偏向揺動力の増加を途中で抑えることによって、かみそりヘッドを円滑に揺動させることができる。請求項４は、変化後の揺動における偏向揺動力の増加傾斜度が、変化前の揺動における増加傾斜度の半分以下であるから、偏向揺動力の増加を顕著に抑えることができる。請求項５は、変化後の揺動における偏向揺動力の増加傾斜度は、ほぼ０であるから、変化後に偏向揺動力はほとんど増加せず、かみそりヘッドがきわめて滑らかに揺動する。
【００１６】
請求項６は、カム装置又はカム従動節の係合面は、変化前の揺動時に他方の係合面と係合する第１係合面と、変化後の揺動時に係合する第２係合面を有し、カム装置とカム従動節との接触点における共通接線と、前記揺動軸線を中心とし前記接触点を通る円の該接触点における接線とのなす角度を接触角度と定義して、第１係合面における接触角度よりも第２係合面における接触角度の方が小さくなるように係合面が形成されている。このような構成にすることによって、偏向揺動力の増加傾斜度を小さくすることができる。
【００１７】
請求項７は、第１係合面における接触角度よりも第２係合面における接触角度の方が小さくなるように、両係合面の境が屈曲した構成である。これにより、偏向揺動力の増加傾斜度を小さくするための構造を簡単に形成することができてコストを安くすることができる。請求項８は、前記第２係合面における接触角度の絶対値がほぼ０度乃至ほぼ３０度である構成である。このような角度とすることによって、偏向揺動力の増加傾斜度を十分に小さくすることができる。
【００１８】
請求項９は、ホルダーの上端に該ホルダーとほぼ直角をなすようにかみそりヘッドが取り付けられ、カム装置はかみそりヘッドの底面に設けられており、カム従動節はホルダーの上部中央から上方に延びる弾性片であり、カム従動節に形成された第１係合面及び第２係合面が前記カム装置とカム結合した構成である。したがって、カム従動節はホルダーに設けられ、第１係合面及び第２係合面はこのカム従動節に形成されているから、偏向揺動力の増加傾斜度を変化させる構造が簡単であって製造が容易である。
【００１９】
請求項１０は、係合面が弾性片の上部の背面方向にく字形に屈曲した背面に形成され、く字形の屈曲部から端部方向の背面が第１係合面であり、く字形の屈曲部から基部方向の背面が第２係合面である構成である。このような構成にしたことによって、偏向揺動力の増加傾斜度を変化させる構造が簡単であって製造が容易である。請求項１１は、かみそりヘッドは、該かみそりヘッドのカム装置の係合面が前記第１及び第２の係合面上を滑るように当初の位置から一方向に揺動し、且つ該揺動を規制する手段を備えている構成である。一方の方向へ揺動するときは揺動角を大きくすることができるが、従来はそれに伴なって偏向揺動力がかなり増加した。しかし、本項の構成では偏向揺動力の増加傾斜度を途中で小さくすることができるから、従来よりも円滑に大きな揺動を得ることができる。請求項１２は、かみそりヘッドの底面からＬ字形に端部が刃先縁方向である前方を向くように突出し、該端部がカム従動節とカム係合する構成である。このように構成することによって、これと係合するカム従動節を請求項１０のように簡単な構成とすることができる。請求項１３は、かみそりヘッドの揺動を規制する手段は、ホルダーと一体に形成されたストッパーであって、該ストッパーは前記弾性片の両側近傍に位置している。したがって、かみそりヘッドを弾性片の両側近傍、すなわちかみそりヘッドの中央付近でストッパーにより支持するので、かみそりヘッドの中央付近が撓んで変形する虞がないのである。
【００２０】
請求項１４は、弾性片から間隔を置いた両側近傍に凹の円弧状をなすかみそりヘッド受け面及び該かみそりヘッド受け面と一体にストッパーが形成され、かみそりヘッドの底面には凸の円弧状をなし前記かみそりホルダー受け面と面接触する凸面部が一体に形成され、これらのかみそりヘッド受け面及び凸面部はホルダーとかみそりヘッドとの結合装置と別に設けられている構成である。したがって、ストッパーがかみそりヘッド受け面と一体に形成されているので、新たにストッパーを設けることがなく製造が容易となる。
【００２１】
請求項１５は、揺動途中における増加傾斜度の変化する過程を経てかみそりヘッドが揺動範囲の一杯近くまで揺動したときに、偏向揺動力の増加傾斜度がそれまでのどの増加傾斜度よりも大きくなるように変化する構成である。すなわち、増加傾斜度が二度変化する構成である。これによって、一杯に揺動したときに、その揺動が突然停止することによるヒゲの剃り残しを防止できる。
【００２２】
【発明の実施の形態】
次に本発明の実施の形態を図面に従って説明する。図３に示すようにホルダー１は上部に一対のアーム２，２が一体に設けられている。アーム２，２は幅広に形成され、上部両端から突出する突起部４，４に内向きのジャーナル軸３，３が一体に形成されている。両アーム２，２の内側部に沿って板状の受け部５，５が突出するように一体に設けられている。この受け部５，５がかみそりヘッド６の揺動を受けるためのものであって、その上端に凹の円弧状をなす受け面７，７が形成されている。
【００２３】
図３に示すように、ホルダー１から両アーム２，２の間を通って上部に延びる弾性片８がホルダー１と一体に設けられている。この弾性片８がかみそりヘッド６のカム装置と係合するカム従動節である。図４に示すように、弾性片８の上端部は背面方向にく字形に屈曲し、屈曲部９から上方部分が第１係合面１０で下方部分が第２係合面１１となる。両係合面１０，１１はほぼ平面状に形成されており、両係合面１０，１１のなす角度は１００度である。角度はほぼ９０度からほぼ１４０度程度が好ましいがこれに限定されるものではない。また、係合面は平面状でなくてもよく、やや凸の弧状であってもよい。屈曲部９の表面は滑らかな弧状に形成されることが好ましいがこれに限定されることはなく、角張った屈曲であっても差し支えない。また、弾性部８は、ホルダー１の背面側に寄っている。これは、弾性部８がかみそりヘッド６に対してその後部を上げる一方向のみの偏向揺動力を与えるからである。したがって、弾性片８は背面側に寄っている方が構成上都合が良いのである。
【００２４】
かみそりヘッド６は刃台１２と天板１３との間に刃体２１，２２が挟着固定されている。かみそりヘッド６の底面にはジャーナル軸受（図示せず。）が設けられており、ホルダーのジャーナル軸３とジャーナル結合し、ジャーナル軸線を中心に揺動可能にホルダー１に取りつけられている。かみそりヘッド６はホルダー１に交換可能に取り付けられてもよく、恒久的に取り付けられてもよい。
【００２５】
図１及び図６に示すように、かみそりヘッド６の底面にカム装置１５が刃台１２と一体に設けられている。カム装置１５は、幅が弾性片８の先端とほぼ同じであり、断面がほぼＬ字形であって端部１６が刃先縁方向を向いており、その下部は滑らかな弧状に形成されている。この端部１６付近の表面がカム面１７となる。
【００２６】
図５は、かみそりヘッド６がほぼ一杯に揺動して、かみそりヘッドの底面２３がストッパー部１９に当たる直前の状態を示している。図６の点線で示すように、かみそりヘッド６の前部底面に一対の凸面部１８が形成されている。この凸面部１８が、前述したホルダーの受け面７，７と係合してかみそりヘッド６の揺動を円滑にすることができる。また、図４に示すように、受け面７の上方にストッパー部１９が形成されている。ヒゲ剃り時にかみそりヘッド６の底面がストッパー部１９に当たって、かみそりヘッド６が過剰に揺動することを防止するためのものである。
【００２７】
次に本発明の作用について説明する。図１は揺動の第１段階を示している。すなわち、カム装置１５が弾性片の第１係合面１０と係合している状態である。この場合、偏向揺動力の増加傾斜度は比較的大きく設定されており、かみそりヘッド６の揺動に伴なって偏向揺動力が増加し、徐々にかみそりヘッド６の揺動が重くなりつつある状態である。偏向揺動力の増加傾斜度が大きい理由は、図７に示すように、この状態におけるカム装置１５と第１係合面１０との接触点１４における共通接線２４と、かみそりヘッド６の揺動軸線を中心としこの接触点１４を通る円２６の当該接触点１４における接線２８とのなす角度である接触角度θａが比較的大きいからである。ここで揺動軸線とは、両ジャーナル軸３，３の中心を結ぶ線である。接触角度θａが大きいということは、カム装置１５が接触点１４において弾性片８をその変位する方向に押す分力が大きいということであって、そのために偏向揺動力が比較的大きく増加するのである。
【００２８】
図２は揺動の第２段階を示している。すなわち、カム装置１５が屈曲部９を通過して第２係合面１１と係合している状態である。図８に示すように、この状態におけるカム装置１５と第２係合面１１との接触点１４における共通接線２５と、かみそりヘッド６の揺動軸線を中心としこの接触点１４と通る円２７の当該接触点１４における接線２９との接触角度θｂは、前述した第１段階に比べて小さくなっている。このことは第１段階と比較して、増加する揺動角に対して弾性片８の変位の増加はわずかであって、偏向揺動力の増加もわずかであり、かみそりヘッド６の揺動の重さもあまり変わらない。したがって、第２段階の揺動も円滑に行なうことができる。第２係合面における接触角度θｂはほぼ０度からほぼ３０度程度が好ましいが、３０度を超えても差し支えない。
【００２９】
前述したように、揺動の第１段階における偏向揺動力の増加傾斜度は第２段階で小さく変化するが、その変化の割合は第１段階の増加傾斜度に対して第２段階の増加傾斜度がほぼ８０％以下であれば効果は得られる。７０％程度でも６０％程度でもよい。好ましくは半分以下がよい。ほとんど増加しないほぼ０％であってもよい。
【００３０】
揺動の第２段階の途中から、偏向揺動力の増加傾斜度を第１段階よりも大きくする構成を設けてもよい。例えば、図１において第２係合面１１の途中で第３の係合面として第２係合面１１に対して高くなる傾斜面を形成することにより、増加傾斜度を大きくすることができる。これによって、ストッパー部１９を設けなくても揺動を規制することができる。
【００３１】
図６は、かみそりヘッドの複数の刃体と天板とガードバーの好ましい関係を示したものである。天板１３とガードバー２０を結ぶ共通接線に対して突出する上刃２１の刃先縁から前記共通接線に垂直に引いた露出量をｈ１、下刃２２の同じ露出量をｈ２、上刃２１と共通接線のなす角度である剃り角度をθ１、下刃２２の剃り角度をθ２として、露出量ｈは共に０．１ｍｍ以下であって且つｈ１がｈ２以上であり、剃り角度θは共に１０度から２０度であるときに滑らかに剃ることができる。また、ホルダーの把持部を通る軸線に対して前記共通接線のなす角度であるホルダー角度は、不使用時で１８度、かみそりヘッドが４５度揺動するとして使用時に１８度から５８度にすると剃り心地のよい安全かみそりを得ることができる。
【図面の簡単な説明】
【図１】かみそりヘッドの第１段階の揺動状態を示す断面図
【図２】かみそりヘッドの第２段階の揺動状態を示す断面図
【図３】ホルダーの上部背面図
【図４】かみそりヘッドを外した状態のホルダーの上部断面図
【図５】かみそりヘッドがほぼ一杯に揺動した状態においてアームと弾性片の間の空間を通る線で切ったホルダーの上部断面図
【図６】かみそりヘッドの刃先縁付近の断面図
【図７】第１段階の揺動における共通接線の接触角度を示す断面図
【図８】第２段階の揺動における共通接線の接触角度を示す断面図
【符号の説明】
１ホルダー
２アーム
３ジャーナル軸
４突起部
５受け部
６かみそりヘッド
７受け面
８弾性片
９屈曲部
１０第１係合面
１１第２係合面
１２刃台
１３天板
１４接触点
１５カム装置
１６端部
１７カム面
１８凸面部
１９ストッパー部
２０ガードバー
２１上刃
２２下刃
２３かみそりヘッドの底面
２４共通接線
２５共通接線
２６円
２７円
２８接線
２９接線[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a swing-type safety razor in which a razor head is swingably mounted on a holder.
[0002]
[Prior art]
The swing-type safety razor has a structure in which a razor head swings in accordance with unevenness of a face during use, and is widely used and accepted by consumers. The most important thing with a swinging safety razor is how smoothly the razor head rocks during use. In particular, as the swing angle of the razor head increases, the deflection swing power for returning the razor head to its original position also increases in proportion to the swing angle, and the swing of the razor head increases. In view of this, there is a razor head in which a cam follower that applies deflection power to the cam surface is formed in an elastic piece shape on a holder, and a bent portion protruding like a hump is provided in the middle (for example, see Patent Document 1). .
[0003]
[Patent Document 1]
Japanese Patent No. 3028408
[Problems to be solved by the invention]
Japanese Patent Application Laid-Open No. H11-163873 discloses that a pusher, which is a cam follower, is provided with a knob-shaped bent portion so that the razor head is given a soft and well-balanced swing by a vertical movement of the pusher and a back and forth swing. . However, even with such a configuration, as the oscillating angle of the razor head increases, the deflection oscillating power increases proportionally. Therefore, the swing increases as the swing angle of the razor head increases. In view of the above, the present invention provides a deflecting oscillating head in which, when the oscillating angle of the razor head increases, the inclination of the deflecting oscillating power, which increases so as to be proportional to the oscillating angle, is made smaller than before. This prevents the power from increasing at a similar rate. Accordingly, it is an object of the present invention to provide a safety razor that does not increase the swing of the razor head even when the swing angle of the razor head becomes large, and can obtain a smooth swing of the razor head.
[0005]
Furthermore, in particular, in a safety razor in which the elastic force of the cam follower is weakened to reduce the deflection swing power, it is necessary to provide a stopper for stopping the swing of the razor head at a fixed angle. However, if the swing of the razor head is stopped by the stopper, the swing is suddenly stopped. Therefore, when the swing is swinging in the direction in which the rear portion of the razor head is lowered, there is a possibility that the beard is shaved and left. Therefore, in order to stop the swing gently, a stopper may not be provided, and the deflection swing power may be increased to such an extent that the swing becomes difficult. Therefore, an object of the present invention is to provide a safety razor in which when the swing of the razor head is almost full, the swing does not stop suddenly but stops with some flexibility.
[0006]
[Means for Solving the Problems]
According to a first aspect of the present invention, a cam is provided such that the increasing inclination of the deflecting oscillating power obtained by dividing the deflecting oscillating power increased by the razor head oscillation by the oscillating angle changes in the course of the oscillation. In this configuration, the engagement surface of the device or the cam follower is formed. The change in the increasing gradient in the course of the swing is, for example, a clear change such as decreasing to about 80% as compared with the increasing gradient up to that time.
[0007]
Claim 2 relates to the swinging of the razor head in one direction, wherein the engagement surface of the cam device or the cam follower that engages when the increasing inclination changes is bent at a portion corresponding to the change, The third aspect of the present invention is configured such that the increasing inclination of the deflection swing power in the swing after the change is smaller than the increasing slope of the deflection swing power in the swing before the change. A fourth aspect of the present invention is such that an increasing gradient of the deflection rocking power in the swing after the change is equal to or less than half of the increasing gradient in the swing before the change. The configuration is such that the increase gradient is substantially zero.
[0008]
According to a sixth aspect, the engagement surface of the cam device or the cam follower engages with the first engagement surface during the swing before the change and the second engagement surface during the swing after the change. An angle between a common tangent at a contact point between the cam device and the cam follower having an engaging surface and a tangent at a contact point of a circle passing through the contact point with the swing axis as the center is defined as a contact angle. Then, the engagement surface is formed such that the contact angle on the second engagement surface is smaller than the contact angle on the first engagement surface.
[0009]
Claim 7 is a configuration in which the boundary between the two engaging surfaces is bent such that the contact angle on the second engaging surface is smaller than the contact angle on the first engaging surface. The absolute value of the contact angle on the second engagement surface is substantially 0 degree to approximately 30 degrees.
[0010]
According to a ninth aspect of the present invention, a razor head is mounted on the upper end of the holder so as to be substantially perpendicular to the holder, the cam device is provided on the bottom surface of the razor head, and the cam follower extends upward from the upper center of the holder. An element which is a piece and has a first engagement surface and a second engagement surface formed on a cam follower and which is cam-coupled to the cam device is limitedly added to the first to eighth aspects.
[0011]
According to a tenth aspect of the present invention, the engaging surface is formed on the back surface of the upper portion of the elastic piece bent in the shape of a back surface, and the back surface in the direction from the bent portion toward the end portion is the first engaging surface. An element whose back surface in the base direction from the bent portion is the second engagement surface is configured to be limitedly added to claim 9, wherein the razor head is an engagement surface of a cam device of the razor head. 13. The razor head according to claim 12, further comprising means for swinging in one direction from an initial position so as to slide on said first and second engagement surfaces, and means for regulating said swing. , The end protrudes in an L-shape from the bottom surface so as to face forward, which is the direction of the blade edge, and the end engages the cam follower. According to a thirteenth aspect, the means for restricting swinging of the razor head is a stopper formed integrally with the holder, and the stopper is an element located near both sides of the elastic piece. This is a configuration limitedly added to FIG.
[0012]
The razor head receiving surface and the razor head receiving surface are formed integrally with the razor head receiving surface having a concave arc shape near both sides spaced from the elastic piece, and a convex arc shape is formed on the bottom surface of the razor head. The razor holder receiving surface is formed integrally with the razor holder receiving surface, and the razor head receiving surface and the convex portion are provided separately from the holder and the razor head coupling device.
[0013]
According to a fifteenth aspect, when the razor head swings to almost the full swing range through the process of changing the increasing slope during swinging, the increasing slope of the deflection swing power is larger than any of the previous increasing slopes. Is also changed so as to increase. That is, the configuration is such that the change of the increase gradient is not once.
[0014]
【The invention's effect】
A cam device or a cam so that the increasing inclination of the deflection rocking power obtained by dividing the deflection rocking power increased due to the rocking of the razor head by the rocking angle changes during the rocking. This is a configuration in which the engagement surface of the follower is formed. Thus, when the increasing inclination of the deflection oscillating power changes small, even if the razor head is further swung, the increase of the deflection oscillating power is slight, so that the razor head can be swung smoothly. In addition, when the increasing inclination of the deflection oscillating power greatly changes, the deflection oscillating power becomes larger when the razor head is further swung, and the swing can be regulated. Conventionally, the shaving of the razor head is suddenly stopped by the stopper, so that the mustache remains unshaved. This can be effectively prevented.
[0015]
Claim 2 relates to one-way swinging of the razor head, wherein the engaging surface of the cam device or the cam follower that engages when the increasing inclination changes is bent at a portion corresponding to the change. The degree of increase in inclination can be easily changed by bending the engaging surface of the cam device or the cam follower. The third aspect of the present invention is configured such that the increasing inclination of the deflection swing power in the swing after the change is smaller than the increasing slope of the deflection swing power in the swing before the change. With this configuration, the razor head can be smoothly swung by suppressing an increase in the deflection swing power halfway as described in the effect of the first aspect. According to the fourth aspect, since the increasing inclination of the deflection swing power in the swing after the change is equal to or less than half of the increasing slope in the swing before the change, the increase in the deflection swing power can be remarkably suppressed. According to the fifth aspect, since the increasing inclination of the deflection swing power in the swing after the change is almost 0, the deflection swing power hardly increases after the change, and the razor head swings very smoothly.
[0016]
According to a sixth aspect, the engagement surface of the cam device or the cam follower engages with the first engagement surface during the swing before the change and the second engagement surface during the swing after the change. An angle between a common tangent at a contact point between the cam device and the cam follower having an engaging surface and a tangent at a contact point of a circle passing through the contact point with the swing axis as the center is defined as a contact angle. The engagement surface is formed such that the contact angle on the second engagement surface is smaller than the contact angle on the first engagement surface. With this configuration, it is possible to reduce the increasing inclination of the deflection swing power.
[0017]
Claim 7 is a configuration in which the boundary between the two engaging surfaces is bent such that the contact angle on the second engaging surface is smaller than the contact angle on the first engaging surface. This makes it possible to easily form a structure for reducing the increasing inclination of the deflecting power and reduce the cost. According to another aspect of the present invention, the absolute value of the contact angle on the second engagement surface is approximately 0 degrees to approximately 30 degrees. With such an angle, it is possible to sufficiently reduce the increasing inclination of the deflection swing power.
[0018]
According to a ninth aspect of the present invention, a razor head is mounted on the upper end of the holder so as to be substantially perpendicular to the holder, the cam device is provided on the bottom surface of the razor head, and the cam follower extends upward from the upper center of the holder. The first engagement surface and the second engagement surface formed on the cam follower are cam-coupled to the cam device. Therefore, since the cam follower is provided on the holder and the first engagement surface and the second engagement surface are formed on the cam follower, the structure for changing the increasing inclination of the deflection swing power is simple. Easy to manufacture.
[0019]
According to a tenth aspect of the present invention, the engaging surface is formed on the back surface of the upper portion of the elastic piece bent in the shape of a back surface, and the back surface in the direction from the bent portion toward the end portion is the first engaging surface. The rear surface in the base direction from the bent portion is a second engagement surface. With such a configuration, the structure for changing the increasing inclination of the deflection rocking power is simple and easy to manufacture. 11. The razor head according to claim 11, wherein the razor head swings in one direction from an initial position such that an engagement surface of a cam device of the razor head slides on the first and second engagement surfaces. This is a configuration provided with a means for regulating When swinging in one direction, the swing angle can be increased, but conventionally the deflection swing power has increased considerably. However, in the configuration of this section, since the increasing inclination of the deflection rocking power can be reduced halfway, a large rocking can be obtained more smoothly than before. According to a twelfth aspect of the present invention, the end of the razor head protrudes from the bottom surface of the razor in an L-shape so that the end faces forward, which is the direction of the blade edge, and the end engages the cam follower. According to this structure, the cam follower engaged with the cam follower can be made simple as described in claim 10. According to a thirteenth aspect, the means for restricting the swinging of the razor head is a stopper formed integrally with the holder, and the stopper is located near both sides of the elastic piece. Therefore, since the razor head is supported by the stopper near both sides of the elastic piece, that is, near the center of the razor head, there is no possibility that the razor head is bent near the center and deformed.
[0020]
The razor head receiving surface and the razor head receiving surface are formed integrally with the razor head receiving surface having a concave arc shape near both sides spaced from the elastic piece, and a convex arc shape is formed on the bottom surface of the razor head. The razor holder receiving surface is formed integrally with the razor holder receiving surface, and the razor head receiving surface and the convex portion are provided separately from the holder and the razor head coupling device. Therefore, since the stopper is formed integrally with the razor head receiving surface, the manufacture becomes easy without providing a new stopper.
[0021]
According to a fifteenth aspect, when the razor head swings to almost the full swing range through the process of changing the increasing slope during swinging, the increasing slope of the deflection swing power is larger than any of the previous increasing slopes. Is also changed so as to increase. That is, the configuration is such that the increase gradient changes twice. With this, it is possible to prevent the beard from being left unshaved due to sudden stop of the swing when the swing is fully swung.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 3, the holder 1 has a pair of arms 2 and 2 integrally provided on the upper part. The arms 2 and 2 are formed to be wide, and the inwardly directed journal shafts 3 and 3 are integrally formed with the projections 4 and 4 protruding from both upper ends. Plate-shaped receiving portions 5 and 5 are integrally provided so as to protrude along the inner portions of both arms 2 and 2. The receiving portions 5, 5 are for receiving the swing of the razor head 6, and have concave receiving surfaces 7, 7 formed at the upper end thereof.
[0023]
As shown in FIG. 3, an elastic piece 8 extending upward from the holder 1 through between the arms 2 and 2 is provided integrally with the holder 1. This elastic piece 8 is a cam follower that engages with the cam device of the razor head 6. As shown in FIG. 4, the upper end of the elastic piece 8 is bent in the shape of a letter in the rear direction, and the upper part from the bent part 9 becomes the first engagement surface 10 and the lower part becomes the second engagement surface 11. The two engagement surfaces 10, 11 are formed in a substantially planar shape, and the angle formed by the two engagement surfaces 10, 11 is 100 degrees. The angle is preferably approximately 90 degrees to approximately 140 degrees, but is not limited thereto. Further, the engagement surface need not be planar, but may be slightly convex arc-shaped. The surface of the bent portion 9 is preferably formed in a smooth arc shape, but is not limited to this, and may be an angular bend. The elastic portion 8 is located closer to the back side of the holder 1. This is because the elastic portion 8 gives the razor head 6 a deflection swinging power in only one direction for raising the rear portion. Therefore, it is more convenient for the structure that the elastic piece 8 is closer to the rear side.
[0024]
The razor head 6 has blade bodies 21 and 22 sandwiched and fixed between the blade base 12 and the top plate 13. A journal bearing (not shown) is provided on the bottom surface of the razor head 6, is journal-coupled to the journal shaft 3 of the holder, and is attached to the holder 1 so as to be swingable about the journal axis. The razor head 6 may be exchangeably mounted on the holder 1 or may be permanently mounted.
[0025]
As shown in FIGS. 1 and 6, a cam device 15 is provided on the bottom surface of the razor head 6 integrally with the blade base 12. The cam device 15 has substantially the same width as the distal end of the elastic piece 8, has a substantially L-shaped cross section, has an end portion 16 facing the edge of the cutting edge, and has a lower portion formed in a smooth arc shape. The surface near the end 16 becomes the cam surface 17.
[0026]
FIG. 5 shows a state immediately before the razor head 6 swings almost completely and the bottom surface 23 of the razor head hits the stopper portion 19. As shown by the dotted line in FIG. 6, a pair of convex portions 18 are formed on the front bottom surface of the razor head 6. The convex portion 18 engages with the receiving surfaces 7, 7 of the holder described above, so that the razor head 6 can smoothly swing. In addition, as shown in FIG. 4, a stopper portion 19 is formed above the receiving surface 7. This is for preventing the razor head 6 from excessively swinging when the bottom surface of the razor head 6 hits the stopper portion 19 during shaving.
[0027]
Next, the operation of the present invention will be described. FIG. 1 shows the first stage of the swing. That is, the cam device 15 is engaged with the first engagement surface 10 of the elastic piece. In this case, the increasing inclination of the deflection oscillating power is set to be relatively large, and the deflection oscillating power increases with the swing of the razor head 6, and the swing of the razor head 6 is gradually becoming heavier. It is. As shown in FIG. 7, the reason why the increasing inclination of the deflection swing power is large is that the common tangent line 24 at the contact point 14 between the cam device 15 and the first engagement surface 10 in this state, and the swing axis of the razor head 6. This is because the contact angle θa, which is the angle formed by the circle 26 passing through the contact point 14 and the tangent 28 at the contact point 14, is relatively large. Here, the swing axis is a line connecting the centers of the journal shafts 3 and 3. A large contact angle θa means that the cam unit 15 has a large component force to push the elastic piece 8 at the contact point 14 in the direction in which the elastic piece 8 is displaced, and therefore the deflection swing power increases relatively large. .
[0028]
FIG. 2 shows the second stage of the swing. That is, the cam device 15 is engaged with the second engagement surface 11 through the bent portion 9. As shown in FIG. 8, a common tangent line 25 at a contact point 14 between the cam device 15 and the second engagement surface 11 in this state, and a circle 27 passing through the contact point 14 with the oscillating axis of the razor head 6 as a center. The contact angle θb with the tangent line 29 at the contact point 14 is smaller than in the first stage described above. This means that, as compared with the first stage, the displacement of the elastic piece 8 is slightly increased and the deflection swing power is slightly increased with respect to the increased swing angle, and the weight of the swing of the razor head 6 is increased. It doesn't change much. Therefore, the swing of the second stage can be performed smoothly. The contact angle θb at the second engagement surface is preferably approximately 0 ° to approximately 30 °, but may exceed 30 °.
[0029]
As described above, the increasing gradient of the deflection swinging power in the first stage of swinging changes slightly in the second stage, but the rate of the change is larger than that in the first stage. If the degree is approximately 80% or less, the effect can be obtained. It may be about 70% or about 60%. Preferably less than half. It may be almost 0%, which hardly increases.
[0030]
A configuration may be provided in which the degree of increase in the deflection oscillating power is made larger than that in the first stage from the middle of the second stage of the oscillation. For example, by forming an inclined surface that is higher than the second engagement surface 11 as a third engagement surface in the middle of the second engagement surface 11 in FIG. 1, the degree of increase in inclination can be increased. Thus, the swing can be regulated without providing the stopper portion 19.
[0031]
FIG. 6 shows a preferred relationship among the plurality of blades of the razor head, the top plate, and the guard bar. The exposure amount h1 perpendicular to the common tangent line from the cutting edge of the upper blade 21 projecting from the common tangent line connecting the top plate 13 and the guard bar 20 is h1, the same exposure amount of the lower blade 22 is h2, and the upper blade 21 is common. Assuming that the shaving angle, which is the angle between the tangents, is θ1 and the shaving angle of the lower blade 22 is θ2, the exposure h is 0.1 mm or less, h1 is h2 or more, and the shaving angle θ is both 10 degrees to 20 degrees. You can shave smoothly when the degree is right. Further, the angle of the holder, which is the angle formed by the common tangent with respect to the axis passing through the gripping portion of the holder, is 18 degrees when not in use, and when the razor head swings 45 degrees, the shaving is performed from 18 to 58 degrees during use. A comfortable safety razor can be obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a first-stage swing state of a razor head. FIG. 2 is a cross-sectional view showing a second-stage swing state of a razor head. FIG. 3 is an upper rear view of a holder. Top sectional view of the holder with the head removed [Figure 5] Top sectional view of the holder taken along a line passing through the space between the arm and the elastic piece when the razor head is swung almost fully [Figure 6] FIG. 7 is a sectional view showing the contact angle of a common tangent line in the first-stage swing. FIG. 8 is a sectional view showing the contact angle of a common tangent line in the second-stage swing. Description]
DESCRIPTION OF SYMBOLS 1 Holder 2 Arm 3 Journal shaft 4 Projection part 5 Reception part 6 Razor head 7 Reception surface 8 Elastic piece 9 Bend part 10 First engagement surface 11 Second engagement surface 12 Blade base 13 Top plate 14 Contact point 15 Cam device 16 End 17 Cam surface 18 Convex surface 19 Stopper 20 Guard bar 21 Upper blade 22 Lower blade 23 Razor head bottom surface 24 Common tangent line 25 Common tangent line 26 Yen 27 Yen 28 Tangent line 29 Tangent line

Claims

The razor head attached to the holder can swing about the swing axis, and the cam mechanism provided on the razor head and the holder receives the deflection swinging power that returns the swinging razor head to its original position, In the swing type safety razor in which the cam device and the cam follower engage with each other, the cam mechanism increases the deflection swing power by dividing the deflection swing power increased by the swing of the razor head by the swing angle. A safety razor characterized in that an engaging surface of a cam device or a cam follower is formed so that a degree of inclination changes in the course of swinging.

2. A safety razor according to claim 1, wherein, with respect to the one-way swing of the razor head, the engaging surface of the cam device or the cam follower engaged when the increasing inclination changes, is bent at a corresponding portion at the time of the change.

3. The safety razor according to claim 1, wherein the inclination of the deflection oscillating power in the swing after the change is smaller than the inclination of the deflection oscillating power in the swing before the change.

4. The safety razor according to claim 3, wherein the increasing inclination of the deflection swing power in the swing after the change is equal to or less than half of the increasing slope in the swing before the change.

4. The safety razor according to claim 3, wherein an increasing inclination of the deflection rocking power in the rocking after the change is substantially zero.

The engagement surface of the cam device or the cam follower has a first engagement surface that engages with the other engagement surface when swinging before the change, and a second engagement surface that engages when swinging after the change. An angle between a common tangent at a contact point between the cam device and the cam follower and a tangent at a contact point of a circle passing through the contact point about the swing axis is defined as a contact angle. The safety razor according to claim 3, wherein the engagement surface is formed such that a contact angle on the second engagement surface is smaller than a contact angle on the engagement surface.

7. The safety razor according to claim 6, wherein the boundary between the two engagement surfaces is bent so that the contact angle on the second engagement surface is smaller than the contact angle on the first engagement surface.

The safety razor according to claim 3, wherein an absolute value of a contact angle at the second engagement surface is approximately 0 degrees to approximately 30 degrees.

A razor head is attached to the upper end of the holder at a substantially right angle to the holder, a cam device is provided on the bottom surface of the razor head, and a cam follower is an elastic piece extending upward from the upper center of the holder. 9. The safety razor according to claim 1, wherein the first engagement surface and the second engagement surface formed on the follower are cam-coupled to the cam device.

The engagement surface is formed on the back surface of the upper portion of the elastic piece bent in the shape of a back in the shape of a back, and the back surface in the direction from the bent portion to the end portion is the first engagement surface, and the direction from the bent portion in the shape of the base to the base direction. 10. The safety razor according to claim 9, wherein a back surface of the razor is a second engagement surface.

The razor head includes a means for swinging in one direction from an initial position so that an engagement surface of a cam device of the razor head slides on the first and second engagement surfaces, and means for restricting the swing. The safety razor according to claim 10, comprising:

12. The safety razor according to claim 9, wherein an end portion of the razor head protrudes in an L-shape from the bottom surface so as to face forward, which is a direction of a blade edge, and the end portion engages with a cam follower.

13. The safety razor according to claim 11, wherein the means for restricting the swing of the razor head is a stopper formed integrally with the holder, and the stopper is located near both sides of the elastic piece.

A razor head receiving surface and a stopper are formed integrally with the razor head receiving surface in the form of a concave arc near both sides spaced from the elastic piece, and a convex arc shape is formed on the bottom surface of the razor head. 14. The safety razor according to claim 9, wherein the razor head receiving surface and the razor head receiving surface and the convex portion are provided separately from the holder and the razor head coupling device.

When the razor head swings to near the full swing range through the process of changing the increasing slope during the swing, the increasing slope of the deflection swing power will be larger than any previous increasing slope. 15. The safety razor according to claim 1, wherein the razor varies.