JP2004283262A

JP2004283262A - Structure of opening and closing center of scissors

Info

Publication number: JP2004283262A
Application number: JP2003076631A
Authority: JP
Inventors: Katsumi Hasegawa; 克己長谷川
Original assignee: Kaijirushi Hamono Center KK
Current assignee: Kaijirushi Hamono Center KK
Priority date: 2003-03-19
Filing date: 2003-03-19
Publication date: 2004-10-14

Abstract

<P>PROBLEM TO BE SOLVED: To improve stability during use by improving a spacer having a contact portion in the center of opening and closing of scissors. <P>SOLUTION: The scissors has a spacer 14 pinched between the internal surfaces 10 of two blades 1 and 2 in an opening and closing center 3 and support portions 27 and 28 contacting the two internal surfaces 10 on the base side rather than a turning axis 3a in the two ends 23 and 24 of the spacer 14. The two support portions 27 and 28 are provided in a rigid boy portion provided in the two end faces 23 and 24 of the spacer 14 facing both the internal surfaces 10 and a contact portion 29 having a peak portion 29a of a prescribed height with respect to a reference surface P intersecting the turning axis 3a at right angles is provided in the support portion 27 of the one end face 23. A bottom portion 30 having a prescribed height with respect to the reference face P at the tip side rather than the turning axis 3a is provided on the end face portion 23 provided with the contact point portion 29. An engagement portion 32 is provided as a rotation stopping means to ensure that the spacer 14 turns integrally with one blade 2. In the scissors, since the contact portion 29 having the peak portion 29a in the support portion 27 provided in the rigid portion of the spacer 14 is provided, the contact portion 29 does not move unexpectedly and stability during use is improved. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、両刀身を互いに圧接させる触点部を両刀身間の開閉中心部に設けた鋏に関するものである。
【０００２】
【従来の技術】
下記特許文献１においては、両鋏本体２，５間の開閉中心部で板バネ１がスペーサとして挟持され、その板バネ１が触点部としての機能を果たしている。すなわち、この板バネ１は、両鋏本体２，５のうち一方の鋏本体２に固着され、開閉中心部よりも基端側で他方の鋏本体５の柄部を一方の鋏本体２の柄部から離す向きへ圧接して、開閉中心部よりも先端側で両鋏本体２，５の刃部を互いに圧接させるようになっている。
【０００３】
【特許文献１】
実開昭５４−１０９９８４号公報
【０００４】
【発明が解決しようとする課題】
しかし、前記板バネ１は、開閉中心部よりも基端側で一方の鋏本体２の柄部に対し隙間が生じ、その隙間の範囲で撓むことができるため、互いに圧接された両鋏本体２，５の刃部が互いに離れる向きへ広げられるおそれがあり、使用時の安定性に欠ける問題があった。
【０００５】
この発明は、鋏の開閉中心部において触点部を有するスペーサを改良し、使用時の安定性を向上させることを目的としている。
【０００６】
【課題を解決するための手段及び発明の効果】
後記実施形態の図面（図１〜２及び図３（ａ）に示す第一実施形態、図３（ｂ）に示す第一実施形態の別例）の符号を援用して本発明を説明する。
【０００７】
＊請求項１〜２の発明
請求項１の発明に係る鋏の開閉中心部の構造は下記のように構成されている。
この鋏においては、一対の刀身（１，２）を開閉中心部（３）で回動可能に支持し、この開閉中心部（３）よりも先端側に刃部（４，５）を設けているとともに、この開閉中心部（３）よりも基端側に柄部（６，７）を設けている。この開閉中心部（３）にあっては、この両刀身（１，２）の内面（１０）間に挟持されたスペーサ（１４）を有し、この両刀身（１，２）の内面（１０）に面するこのスペーサ（１４）の両端面部（２３，２４）には、それぞれ、開閉中心部（３）の回動中心線（３ａ）よりも基端側で両刀身（１，２）の内面（１０）に接触する支持部（２７，２８）を設けている。このスペーサ（１４）は両刀身（１，２）に対し分離状態で設けられている。
【０００８】
前記両支持部（２７，２８）はそれぞれ前記スペーサ（１４）の両端面部（２３，２４）に設けた剛体部に設けられている。前記スペーサ（１４）の両端面部（２３，２４）のうち一方の端面部（２３）の前記支持部（２７）には、回動中心線（３ａ）に対し直交する基準面（Ｐ）に対し所定の高さ（Ｈ２９）をなす最高点部（２９ａ）を有する触点部（２９）を設けている。この最高点部（２９ａ）とは、スペーサ（１４）の両端面部（２３，２４）のうち触点部（２９）を設けた端面部（２３）の全範囲のうち、前記基準面（Ｐ）に対する距離（高さＨ２９）が最も大きい部分である。この触点部（２９）を設けた端面部（２３）にあって、基準面（Ｐ）に対する最高点部（２９ａ）の距離（高さＨ２９）は、この最高点部（２９ａ）以外の部分が基準面（Ｐ）に対しなす距離（Ｈ３０等）よりも大きくなっている。ちなみに、前記基準面（Ｐ）に対する距離（Ｈ３０）が最も小さい最低点部（３０）については、請求項２の発明のように前記開閉中心部（３）の回動中心線（３ａ）よりも先端側に設けること以外にも、開閉中心部（３）の回動中心線（３ａ）よりも基端側に設けてもよい。前記剛体部とは、厳密には、どのような力を加えても形や体積が変化しない理想的な固体（完全剛体）をいうが、一般には、外力による変形が非常に少ない物体をも含み、本発明では前記特許文献１で示した板バネのような弾性を持つ触点部を排除する意味に使用されている。
【０００９】
請求項２の発明は請求項１の発明を前提として下記のように構成されている。
前記スペーサ（１４）の両端面部（２３，２４）のうち前記触点部（２９）を設けた端面部（２３）には、前記開閉中心部（３）の回動中心線（３ａ）よりも先端側で前記基準面（Ｐ）に対し所定の高さ（Ｈ３０）をなす最低点部（３０）を設けている。この最低点部（３０）とは、前述した意味以外に、触点部（２９）の最高点部（２９ａ）が開閉中心部（３）よりも基端側で刀身（１，２）の内面（１０）に当接して両刀身（１，２）の内面（１０）が互いに離間することにより、開閉中心部（３）よりも先端側で両刀身（１，２）の内面（１０）が互いに圧接された場合、開閉中心部（３）よりも先端側で刀身（１，２）の内面（１０）に対し間隙（Ｇ）を残すかまたは当接する部分をいう。
【００１０】
請求項１〜２の発明では、スペーサ（１４）の剛体部に設けられた支持部（２７）で最高点部（２９ａ）を有する触点部（２９）を設けているので、従来技術の場合と異なり、その触点部（２９）が不用意に動かず、使用時の安定性を向上させることができる。
【００１１】
＊請求項３〜４の発明
請求項３の発明は請求項２の発明を前提として下記のように構成されている。
前記スペーサ（１４）の両端面部（２３，２４）は前記基準面（Ｐ）に対し平行に設けられて両刀身（１，２）の内面（１０）に面する端面（２３ａ，２４ａ）を有している。このスペーサ（１４）の両端面部（２３，２４）のうち一方の端面部（２３）で前記最高点部（２９ａ）を有する触点部（２９）はこの端面（２３ａ）から突出させた突起である。前記最低点部（３０）は触点部（２９）を設けた端面部（２３）の端面（２３ａ）に設けられている。
【００１２】
請求項４の発明において、請求項３の発明にかかる最低点部（３０）は、触点部（２９）の最高点部（２９ａ）と前記開閉中心部（３）の回動中心線（３ａ）とを結ぶ面（Ｑ）上で、触点部（２９）を設けた端面部（２３）の端面（２３ａ）に設けられている。
【００１３】
請求項３〜４の発明では、最高点部（２９ａ）を有する触点部（２９）と最低点部（３０）とを設けたスペーサ（１４）の形状を簡単にすることができる。
＊請求項５の発明
この発明においては、請求項２または請求項３または請求項４の発明で、触点部（２９）の最高点部（２９ａ）の高さ（Ｈ２９）と前記最低点部（３０）の高さ（Ｈ３０）との間の差（Ｈ２９−Ｈ３０）を０．０５ｍｍ以上３ｍｍ以下に設定した。
【００１４】
請求項５の発明では、開閉中心部（３）よりも先端側で刀身（１，２）の内面（１０）に対し最低点部（３０）が生じ得る間隙（Ｇ）を最小限に抑えて使用時の安定性をより一層向上させることができる。
【００１５】
＊請求項６〜１１の発明
請求項６の発明においては、請求項１から請求項５のうちいずれかの請求項の発明にかかるスペーサ（１４）が両刀身（１，２）のうち一方の刀身（２）と一体的に回動し得るように回り止め手段（３２，３３）を設けている。
【００１６】
請求項７の発明は請求項６の発明を前提として下記のように構成されている。
前記回り止め手段は、前記スペーサ（１４）の両端面部（２３，２４）のうち一方の端面部（２４）側において開閉中心部（３）の回動中心線（３ａ）よりも先端側で一方の刀身（２）の内面（１０）に向けて突出させた係止部（３２）と、この係止部（３２）が係入されるように一方の刀身（２）の内面（１０）に設けた係止孔（３３）とを備えている。
【００１７】
請求項８の発明は請求項６の発明を前提として下記のように構成されている。
前記回り止め手段は、前記スペーサ（１４）にあって両端面部（２３，２４）間に設けた外周面部（２５）で開閉中心部（３）の回動中心線（３ａ）から離間する方向へ突出させた腕部（３１）と、この腕部（３１）で一方の刀身（２）の内面（１０）に向けて突出させた係止部（３２）と、この係止部（３２）が係入されるように一方の刀身（２）の内面（１０）に設けた係止孔（３３）とを備えている。
【００１８】
請求項９の発明は請求項６の発明を前提として下記のように構成されている。
前記回り止め手段は、前記スペーサ（１４）の両端面部（２３，２４）のうち触点部（２９）を設けた一方の端面部（２３）に対し反対側になる他方の端面部（２４）側で一方の刀身（２）の内面に向けて突出させた係止部（３２）と、この係止部（３２）が係入されるように一方の刀身（２）の内面（１０）に設けた係止孔（３３）とを備えている。
【００１９】
請求項１０の発明は、請求項６の発明を前提として下記のように構成されている。
前記回り止め手段は、前記スペーサ（１４）の両端面部（２３，２４）のうち一方の端面部（２４）で一方の刀身（２）の内面（１０）に向けて突出させた係止部（３２）と、この係止部（３２）が係入されるように一方の刀身（２）の内面（１０）に設けた係止孔（３３）とを備えている。この係止部（３２）が開閉中心部（３）の回動中心線（３ａ）に対しなす距離（Ｌ３２）と前記触点部（２９）の最高点部（２９ａ）が開閉中心部（３）の回動中心線（３ａ）に対しなす距離（Ｌ２９）とを互いに等しくしている。
【００２０】
請求項１１の発明において、請求項７から請求項１０のうちいずれかの請求項の発明にかかる回り止め手段の係止部（３２）は、前記触点部（２９）の最高点部（２９ａ）と開閉中心部（３）の回動中心線（３ａ）とを結ぶ面（Ｑ）上に設けられている。
【００２１】
請求項６〜１１の発明では、回り止め手段（３２，３３）によりスペーサ（１４）の触点部（２９）を確実に位置決めするので、両刃部（４，５）を一定状態で互いに圧接させることができる。また、請求項７〜１１の発明では、回り止め手段（３２，３３）を簡単な構造にすることができる。
【００２２】
＊請求項１２の発明
この発明は、請求項１から請求項１１のうちいずれかの請求項の発明を前提として下記のように構成されている。
【００２３】
前記両刀身（１，２）の刃部（４，５）にあって開閉動作時に互いに摺接する刃縁部は、前記基準面（Ｐ）に沿った刃部（４，５）の内面（１０）から互いに相対向して突設された刃先壁（１１）であり、この両刃部（４，５）の刃先壁（１１）の摺接状態でこの両刀身（１，２）の刃部（４，５）の内面（１０）間に空隙（Ｓ）が生じる。
【００２４】
請求項１２の発明では、両刃部（４，５）間に指が入っても両刃先壁（１１）の壁面（１１ｂ）に当たって両刃先壁（１１）の刃先面（１１ａ）に直接当たらないため、指を不用意に傷付けにくくなる。
【００２５】
＊第１３の発明
この発明は、請求項３または請求項４の発明を前提として下記のように構成されている。
【００２６】
スペーサ（１４）の両端面部（２３，２４）の端面（２３ａ，２４ａ）間の間隔（Ｗ２２）は、開閉中心部（３）の回動中心線（３ａ）における両刀身（１，２）の内面（１０）間の間隔（Ｗ１０）よりも小さく設定されている。スペーサ（１４）の両端面部（２３，２４）のうち触点部（２９）を設けた一方の端面部（２３）に対し反対側になる他方の端面部（２４）の端面（２４ａ）とこの触点部（２９）の最高点部（２９ａ）との間の間隔（Ｗ２９）は、開閉中心部（３）の回動中心線（３ａ）における両刀身（１，２）の内面（１０）間の間隔（Ｗ１０）よりも大きく設定されている。
【００２７】
＊第１４の発明
この発明は、請求項７と請求項８と請求項９と請求項１０と請求項１１とのうちから任意に選択した二以上の請求項の発明を互いに組み合わせたものである。
【００２８】
【発明の実施の形態】
以下、本発明の第一実施形態にかかる鋏について図１〜２及び図３（ａ）を参照して説明する。
【００２９】
図１（ａ）に示す一対の刀身１，２は開閉中心部３で回動可能に支持され、この開閉中心部３よりも先端側で両刀身１，２に刃部４，５が設けられているとともに、この開閉中心部３よりも基端側で両刀身１，２に柄部６，７が設けられている。この両刀身１，２で相対向する内側には断面Ｌ形状の金属刃板８が刃部４，５から柄部６，７にわたりプラスチック製のカバー９と一体的に取着されるように設けられている。この刃板８においては、図２（ａ）及び図１（ｂ）に示すように、開閉方向を含む基準面Ｐに沿った内面１０から互いに相対向して突設された刃先壁１１が、両刃部４，５の開閉動作時に互いに摺接する刃縁部として形成されている。この両刃先壁１１においては、互いに摺接する刃先面１１ａが壁面１１ｂの先端部に形成され、その摺接状態で両内面１０間に空隙Ｓが生じる。両刃部４，５の先端部で両刃板８の内面１０はカバー９の一部９ａにより被覆されている。
【００３０】
図１（ｃ）及び図２に示すように、開閉中心部３は、一方の刀身１に形成された支持孔１２と、他方の刀身２に形成された支持孔１３と、両刃板８の内面１０間の空隙Ｓに嵌め込まれてそれらの内面１０間に挟持されたスペーサ１４と、止め部としての支持ピン１５、止めねじ１６及び蓋１７とを備えている。
【００３１】
一方の刀身１の支持孔１２においては、刃板８に四角形状の回り止め孔１８が刃板８の内面１０とカバー９との間で貫設され、このカバー９には蓋孔１９が形成されている。他方の刀身１の支持孔１３においては、刃板８に円形状の挿通孔２０が刃板８の内面１０とカバー９との間で貫設され、このカバー９には開放孔２１が形成されている。
【００３２】
前記スペーサ１４はプラスチックにより成形され、その主体をなす円筒状の本体２２は、両端面部２３，２４と、この両端面部２３，２４間に設けられた円形状の外周面部２５と、この両端面部２３，２４間で貫設された円形状の挿通孔２６とを有している。このスペーサ本体２２の両端面部２３，２４は、前記基準面Ｐに対し平行に設けられて前記両刀身１，２の刃板８の内面１０に面する平面状の端面２３ａ，２４ａを有している。この両端面部２３，２４の外周縁部うち開閉中心部３の回動中心線３ａよりも基端側で刃板８の内面１０に接触する支持部２７，２８が設けられ、これらの支持部２７，２８は剛体部となっている。この両端面部２３，２４のうち一方の端面部２３の支持部２７には端面２３ａから突出する突起状の触点部２９が形成されている。この触点部２９は、回動中心線３ａに対し直交する前記基準面Ｐに対し所定の高さＨ２９をなす平面状の最高点部２９ａを有している。この最高点部２９ａは球面状に形成してもよい。前記両端面部２３，２４のうち触点部２９を有する端面部２３には、回動中心線３ａよりも先端側で最低点部３０が設けられている。この最低点部３０は、触点部２９の最高点部２９ａと回動中心線３ａとを結ぶ想定面Ｑ上で端面部２３の端面２３ａの外周縁部に設けられ、前記基準面Ｐに対し所定の高さＨ３０をなす。前記最高点部２９ａの高さＨ２９と最低点部３０のＨ３０との差Ｈ２９−Ｈ３０は、０．０５ｍｍ以上３ｍｍ以下好ましくは０．１ｍｍ以上２ｍｍ以下に設定されている。
【００３３】
前記スペーサ１４において、両端面部２３，２４のうち触点部２９を有する一方の端面部２３に対し反対側になる他方の端面部２４側で、開閉中心部３の回動中心線３ａよりも先端側の外周面部２５には、腕部３１が回動中心線３ａから離間する方向へ突設されている。この腕部３１には突起状の係止部３２が刀身２の刃板８の内面１０に向けて突設されている。この刀身２の刃板８の内面１０には係止孔３３が形成され、その係止孔３３に対しスペーサ１４の係止部３２が回り止め手段として係入されて刀身２とスペーサ１４とが一体的に回動し得る。この係止部３２は、前記触点部２９の最高点部２９ａと回動中心線３ａとを結ぶ想定面Ｑ上に設けられている。この係止部３２が回動中心線３ａに対しなす距離Ｌ３２は、触点部２９の最高点部２９ａが回動中心線３ａに対しなす距離Ｌ２９よりも大きく設定されている。
【００３４】
前記支持ピン１５は、刀身２の支持孔１３から開放孔２１及び挿通孔２０を通してスペーサ１４の挿通孔２６に挿嵌され、刀身２及びスペーサ１４に対し開閉中心部３の回動中心線３ａを中心に相対回動可能になっているが、刀身１の回り止め孔１８に挿着されて回動中心線３ａを中心に刀身１と一体的に回動し得る。前記止めねじ１６は、刀身１の支持孔１２から蓋孔１９を通して挿入されて支持ピン１５に螺合され、支持ピン１５を刀身１に対し一体的に連結している。前記蓋１７はこの蓋孔１９に挿嵌されて止めねじ１６を隠蔽している。この支持ピン１５と止めねじ１６とを互いに締め付けると、回動中心線３ａよりも基端側で刃板８の内面１０がスペーサ１４における支持部２７の触点部２９と支持部２８とにより互いに広げられ、両刃部４，５の刃板８の刃先壁１１が互いに圧接される。その場合、回動中心線３ａよりも先端側で刃板８の内面１０は、スペーサ１４の最低点部３０に対し、若干の間隙Ｇをあけて面するか、または当接する。ちなみに、開閉中心部３の回動中心線３ａにおける刃板８の内面１０間の間隔Ｗ１０は、スペーサ１４の両端面部２３，２４の端面２３ａ，２４ａ間の間隔Ｗ２２よりも大きく設定され、触点部２９の最高点部２９ａと端面部２４の端面２４ａとの間の間隔Ｗ２９よりも小さく設定されている。
【００３５】
前記スペーサ本体２２の両端面部２３，２４の外周縁部にあって、触点部２９の最高点部２９ａと開閉中心部３の回動中心線３ａとを結ぶ想定面Ｑが通る部分（触点部２９以外の三箇所）のうち、いずれかの部分に係止部３２を形成してもよい。
【００３６】
例えば、図３（ｂ）に示す第一実施形態の別例においては、回動中心線３ａよりも先端側で端面部２４の外周縁部に係止部３２が形成されている。この係止部３２は触点部２９と同様な突起であって、この係止部３２が回動中心線３ａに対しなす距離Ｌ３２と触点部２９の最高点部２９ａが回動中心線３ａに対しなす距離Ｌ２９とは互いに等しく設定されている。この場合、前記基準面Ｐに対する係止部３２の距離と、前記基準面Ｐに対する触点部２９の距離とを互いに等しくするか、またはそれらの距離を互いに変更する。この係止部３２を触点部として兼用したり、この触点部２９を係止部として兼用することができる。
【００３７】
さらに、回り止め手段としては、スペーサ本体２２の外周面部２５に突出部分を形成してその突出部分の平坦部を刃板８に係止するようにしてもよい。
【図面の簡単な説明】
【図１】（ａ）は第一実施形態にかかる鋏を示す平面図であり、（ｂ）は（ａ）のＡ−Ａ線部分断面図であり、（ｃ）は鋏の開閉中心部を示す分解斜視図である。
【図２】（ａ）は図１（ａ）のＢ−Ｂ線部分拡大断面図であり、（ｂ）は（ａ）のＣ−Ｃ線部分断面図である。
【図３】（ａ）は図２（ａ）のスペーサを示す説明図であり、（ｂ）は第一実施形態の別例においてスペーサを示す説明図である。
【符号の説明】
１，２…刀身、３…開閉中心部、３ａ…回動中心線、４，５…刃部、６，７…柄部、８…刃板、１０…刃板の内面、１１…刃板の刃先壁、１４…スペーサ、２３，２４…端面部、２３ａ，２４ａ…端面、２５…外周面部、２７，２８…支持部、２９…触点部、２９ａ…最高点部、３０…最低点部、３１…腕部、３２…係止部（回り止め手段）、３３…係止孔（回り止め手段）、Ｐ…基準面、Ｓ…空隙、Ｑ…想定面、Ｈ２９，Ｈ３０…高さ、Ｌ２９，Ｌ３２…距離。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to scissors provided with a contact point for pressing both blades against each other at an opening / closing center between the blades.
[0002]
[Prior art]
In Patent Literature 1 below, a leaf spring 1 is sandwiched as a spacer at the center of opening and closing between both scissors main bodies 2 and 5, and the leaf spring 1 functions as a contact point portion. That is, the leaf spring 1 is fixed to one scissor body 2 of the two scissor bodies 2 and 5, and the handle portion of the other scissor body 5 is provided at the base end side of the opening / closing center portion with the handle of the one scissor body 2. The blades of the scissors bodies 2 and 5 are pressed against each other on the tip side of the opening / closing center portion.
[0003]
[Patent Document 1]
Published Japanese Utility Model Application No. 54-1099984
[Problems to be solved by the invention]
However, since the leaf spring 1 has a gap with the handle portion of one scissor body 2 on the base end side of the opening / closing center portion and can bend within the range of the gap, the two scissor bodies pressed against each other are pressed. There is a possibility that the blade portions 2 and 5 may be spread away from each other, and there is a problem that stability during use is lacking.
[0005]
SUMMARY OF THE INVENTION It is an object of the present invention to improve a spacer having a contact point portion at the opening / closing center portion of scissors, and to improve stability in use.
[0006]
Means for Solving the Problems and Effects of the Invention
The present invention will be described with reference to the reference numerals of the drawings of the following embodiments (first embodiment shown in FIGS. 1 and 2 and FIG. 3 (a) and another example of the first embodiment shown in FIG. 3 (b)).
[0007]
* Structure of Claims 1 and 2 The structure of the open / close center of the scissors according to the invention of Claim 1 is configured as follows.
In these scissors, a pair of blades (1, 2) are rotatably supported at an opening / closing center (3), and blades (4, 5) are provided on the tip side of the opening / closing center (3). In addition, a handle (6, 7) is provided on the base end side of the opening / closing center (3). The opening / closing center portion (3) has a spacer (14) sandwiched between the inner surfaces (10) of the blades (1, 2), and has an inner surface (10) of the blades (1, 2). ) Facing both ends (23, 24) of the spacer (14) at the base end side of the rotation center line (3a) of the opening / closing center (3). Supports (27, 28) are provided for contacting the inner surface (10). This spacer (14) is provided separately from both blades (1, 2).
[0008]
The two support portions (27, 28) are respectively provided on rigid portions provided on both end surfaces (23, 24) of the spacer (14). The support portion (27) of one end surface portion (23) of the both end surface portions (23, 24) of the spacer (14) is provided with respect to a reference plane (P) orthogonal to the rotation center line (3a). A contact point (29) having a highest point (29a) having a predetermined height (H29) is provided. The highest point (29a) refers to the reference plane (P) of the entire range of the end face (23) provided with the contact point (29) among the end faces (23, 24) of the spacer (14). Is the part with the largest distance (height H29) to. In the end surface portion (23) provided with the touch point portion (29), the distance (height H29) of the highest point portion (29a) to the reference plane (P) is a portion other than the highest point portion (29a). Is larger than the distance (H30 or the like) formed with respect to the reference plane (P). The minimum point (30) having the smallest distance (H30) to the reference plane (P) is smaller than the rotation center line (3a) of the opening / closing center (3). Instead of being provided on the distal end side, it may be provided on the base end side with respect to the rotation center line (3a) of the opening / closing center portion (3). Strictly speaking, the rigid part refers to an ideal solid (completely rigid body) whose shape and volume do not change irrespective of any force applied thereto, but generally includes an object that undergoes very little deformation due to external force. In the present invention, this is used to exclude a touch point having elasticity such as a leaf spring disclosed in Patent Document 1.
[0009]
The invention according to claim 2 is configured as follows on the premise of the invention according to claim 1.
Of the two end surfaces (23, 24) of the spacer (14), the end surface portion (23) where the contact point (29) is provided is more than the rotation center line (3a) of the opening / closing center portion (3). At the tip end, a lowest point (30) is formed at a predetermined height (H30) with respect to the reference plane (P). In addition to the meaning described above, the lowest point portion (30) means that the highest point portion (29a) of the touch point portion (29) is located on the base end side of the opening / closing center portion (3) and the inner surface of the blade (1, 2). The inner surfaces (10) of both blades (1, 2) are separated from each other by abutting against (10), so that the inner surfaces (10) of both blades (1, 2) are closer to the distal end than the opening / closing center (3). When pressed against each other, it refers to a portion where a gap (G) is left or abuts against the inner surface (10) of the blade (1, 2) on the distal end side of the opening / closing center portion (3).
[0010]
According to the first and second aspects of the present invention, since the contact portion (29) having the highest point (29a) is provided at the support portion (27) provided on the rigid portion of the spacer (14). Unlike this, the contact point (29) does not move carelessly, and the stability during use can be improved.
[0011]
* Inventions of Claims 3 and 4 The inventions of Claims 3 are configured as follows based on the inventions of Claims 2.
Both end surfaces (23, 24) of the spacer (14) are provided parallel to the reference surface (P) and have end surfaces (23a, 24a) facing the inner surfaces (10) of both blades (1, 2). are doing. A contact point (29) having the highest point (29a) at one end face (23) of both end faces (23, 24) of the spacer (14) is a projection protruding from the end face (23a). is there. The lowest point portion (30) is provided on the end surface (23a) of the end surface portion (23) provided with the contact point portion (29).
[0012]
According to the fourth aspect of the present invention, the lowest point portion (30) according to the third aspect of the present invention comprises a highest point portion (29a) of the touch point portion (29) and a rotation center line (3a) of the opening / closing center portion (3). ) Is provided on the end face (23a) of the end face part (23) provided with the contact point part (29).
[0013]
According to the third and fourth aspects of the present invention, the shape of the spacer (14) provided with the contact point (29) having the highest point (29a) and the lowest point (30) can be simplified.
* According to the invention of claim 5, in the invention of claim 2, claim 3, or claim 4, the height (H29) of the highest point (29a) of the contact point portion (29) and the lowest point of the contact point portion (29). The difference (H29-H30) between the height (H30) of (30) was set to 0.05 mm or more and 3 mm or less.
[0014]
According to the fifth aspect of the present invention, the gap (G) where the lowest point (30) can be formed with respect to the inner surface (10) of the blade (1, 2) on the tip side of the opening / closing center portion (3) is minimized. The stability during use can be further improved.
[0015]
* The invention of claims 6 to 11 In the invention of claim 6, the spacer (14) according to the invention of any one of claims 1 to 5 has one of the two blades (1, 2). Detent means (32, 33) are provided so as to be able to rotate integrally with the blade (2).
[0016]
The invention of claim 7 is configured as described below on the premise of the invention of claim 6.
The detent means is provided at one end face (24) of both end faces (23, 24) of the spacer (14) at one end on the tip end side of the rotation center line (3a) of the opening / closing center part (3). A locking portion (32) protruding toward the inner surface (10) of the blade (2) and an inner surface (10) of one blade (2) so that the locking portion (32) is engaged. And a locking hole (33) provided.
[0017]
The invention of claim 8 is configured as follows on the premise of the invention of claim 6.
The anti-rotation means is provided in the spacer (14) at an outer peripheral surface (25) provided between both end surfaces (23, 24) in a direction away from the rotation center line (3a) of the opening / closing center (3). The protruding arm portion (31), the locking portion (32) protruding toward the inner surface (10) of one of the blades (2) with the arm portion (31), and the locking portion (32) A locking hole (33) provided in the inner surface (10) of one of the blades (2) so as to be engaged.
[0018]
The invention according to claim 9 is configured as follows on the premise of the invention according to claim 6.
The detent means comprises the other end surface (24) of the both end surfaces (23, 24) of the spacer (14) opposite to the one end surface (23) provided with the contact point (29). A locking portion (32) protruding toward the inner surface of one blade (2) on the side, and an inner surface (10) of one blade (2) so that the locking portion (32) is engaged. And a locking hole (33) provided.
[0019]
The invention according to claim 10 is configured as follows on the premise of the invention according to claim 6.
The detent means includes a locking portion () protruding toward the inner surface (10) of one blade (2) at one end surface (24) of both end surfaces (23, 24) of the spacer (14). 32) and a locking hole (33) provided in the inner surface (10) of one blade (2) so that the locking portion (32) is engaged. The distance (L32) formed by the locking portion (32) with respect to the rotation center line (3a) of the opening / closing center portion (3) and the highest point (29a) of the contact point portion (29) are determined by the opening / closing center portion (3). ) Is equal to the distance (L29) to the rotation center line (3a).
[0020]
According to the eleventh aspect of the present invention, the locking portion (32) of the detent means according to any one of the seventh to tenth aspects is provided with the highest point portion (29a) of the contact point portion (29). ) And the rotation center line (3a) of the opening / closing center portion (3).
[0021]
In the invention according to claims 6 to 11, since the contact point (29) of the spacer (14) is reliably positioned by the rotation preventing means (32, 33), the two blades (4, 5) are pressed against each other in a constant state. be able to. Further, in the inventions according to claims 7 to 11, the detent means (32, 33) can have a simple structure.
[0022]
* Invention of Claim 12 This invention is configured as follows on the premise of the invention of any one of Claims 1 to 11.
[0023]
The blade edges (4, 5) of the blades (1, 2), which are in sliding contact with each other at the time of the opening and closing operation, are formed on the inner surface (10) of the blade (4, 5) along the reference plane (P). ) Are protruded from each other so as to face each other, and the blade portions (1, 2) of the blades (1, 2) are in sliding contact with the blade walls (11) of the blade portions (4, 5). A void (S) is generated between the inner surfaces (10) of (4, 5).
[0024]
According to the twelfth aspect of the present invention, even if a finger enters between the two blade portions (4, 5), it hits the wall surface (11b) of the both edge wall (11) and does not directly hit the edge surface (11a) of the both edge wall (11). Inadvertently hurt your finger.
[0025]
* Thirteenth invention The present invention is configured as follows, based on the invention of claim 3 or claim 4.
[0026]
The distance (W22) between the end faces (23a, 24a) of both end faces (23, 24) of the spacer (14) is the distance between the two blades (1, 2) at the rotation center line (3a) of the opening / closing center part (3). It is set smaller than the interval (W10) between the inner surfaces (10). The end face (24a) of the other end face (24) of the both end faces (23, 24) of the spacer (14), which is opposite to the one end face (23) where the contact point (29) is provided, is provided. The distance (W29) between the contact point (29) and the highest point (29a) is the inner surface (10) of both blades (1, 2) at the rotation center line (3a) of the opening / closing center (3). The interval is set to be larger than the interval (W10).
[0027]
* Fourteenth invention This invention combines two or more inventions arbitrarily selected from claims 7, 8, 9, 10, and 11 with each other. .
[0028]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, scissors according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2 and FIG.
[0029]
A pair of blades 1 and 2 shown in FIG. 1A are rotatably supported at an opening / closing center portion 3, and blade portions 4 and 5 are provided on both blades 1 and 2 at a tip side of the opening / closing center portion 3. In addition, handle portions 6 and 7 are provided on both blades 1 and 2 on the base end side of the opening / closing center portion 3. Metal blade plates 8 having an L-shaped cross section are provided on the inner sides of the blades 1 and 2 facing each other so as to be integrally attached to a plastic cover 9 from the blade portions 4 and 5 to the handle portions 6 and 7. Have been. In this blade plate 8, as shown in FIGS. 2A and 1B, a blade edge wall 11 protruding from the inner surface 10 along the reference plane P including the opening and closing direction is opposed to each other. It is formed as a blade edge portion that slides on each other when the two blade portions 4 and 5 are opened and closed. In the two edge walls 11, the edge surfaces 11 a that are in sliding contact with each other are formed at the tip of the wall surface 11 b, and a gap S is generated between the inner surfaces 10 in the sliding contact state. The inner surface 10 of the double blade plate 8 is covered with a part 9 a of the cover 9 at the tip of the double blade portions 4 and 5.
[0030]
As shown in FIGS. 1C and 2, the opening / closing center portion 3 has a support hole 12 formed in one blade 1, a support hole 13 formed in the other blade 2, and an inner surface of the double blade plate 8. A spacer 14 is fitted into the gap S between the two and is held between the inner surfaces 10 thereof, a support pin 15 as a stopper, a set screw 16 and a lid 17 are provided.
[0031]
In the support hole 12 of the blade 1, a square detent hole 18 is formed in the blade plate 8 between the inner surface 10 of the blade plate 8 and the cover 9, and a cover hole 19 is formed in the cover 9. Have been. In the support hole 13 of the other blade 1, a circular insertion hole 20 is formed in the blade plate 8 between the inner surface 10 of the blade plate 8 and the cover 9, and an open hole 21 is formed in the cover 9. ing.
[0032]
The spacer 14 is formed of plastic, and a cylindrical main body 22 as a main body thereof has two end surfaces 23 and 24, a circular outer peripheral surface 25 provided between the two end surfaces 23 and 24, , 24 and a circular insertion hole 26 penetrating therethrough. Both end surfaces 23, 24 of the spacer body 22 have flat end surfaces 23a, 24a provided parallel to the reference plane P and facing the inner surface 10 of the blade plate 8 of the blades 1, 2. I have. Of the outer peripheral edges of the both end face portions 23, 24, support portions 27, 28 are provided which are in contact with the inner surface 10 of the blade plate 8 on the base end side of the rotation center line 3a of the opening / closing center portion 3, and these support portions 27 are provided. , 28 are rigid parts. A protruding contact point 29 protruding from the end surface 23a is formed on the support portion 27 of one of the end surface portions 23 and 24. The touch point portion 29 has a planar highest point portion 29a that has a predetermined height H29 with respect to the reference plane P orthogonal to the rotation center line 3a. The highest point portion 29a may be formed in a spherical shape. The end surface portion 23 having the contact point portion 29 among the both end surface portions 23 and 24 is provided with the lowest point portion 30 on the tip side from the rotation center line 3a. The lowest point portion 30 is provided on the outer peripheral edge of the end surface 23a of the end surface portion 23 on the assumed surface Q connecting the highest point portion 29a of the touch point portion 29 and the rotation center line 3a, and It has a predetermined height H30. The difference H29-H30 between the height H29 of the highest point portion 29a and H30 of the lowest point portion 30 is set to 0.05 mm or more and 3 mm or less, preferably 0.1 mm or more and 2 mm or less.
[0033]
In the spacer 14, on the other end surface 24 side opposite to the one end surface portion 23 having the contact point portion 29 among the both end surface portions 23, 24, the leading end of the opening / closing center portion 3 with respect to the rotation center line 3a. On the outer peripheral surface portion 25 on the side, an arm portion 31 is provided so as to project in a direction away from the rotation center line 3a. The arm 31 has a projection-shaped engaging portion 32 projecting toward the inner surface 10 of the blade plate 8 of the blade 2. A locking hole 33 is formed in the inner surface 10 of the blade plate 8 of the blade 2, and the locking portion 32 of the spacer 14 is engaged with the locking hole 33 as a detent means so that the blade 2 and the spacer 14 are separated. It can rotate integrally. The locking portion 32 is provided on an assumed plane Q connecting the highest point portion 29a of the contact point portion 29 and the rotation center line 3a. The distance L32 formed by the locking portion 32 with respect to the rotation center line 3a is set to be larger than the distance L29 formed by the highest point portion 29a of the touch point portion 29 with respect to the rotation center line 3a.
[0034]
The support pin 15 is inserted into the insertion hole 26 of the spacer 14 from the support hole 13 of the blade 2 through the opening hole 21 and the insertion hole 20, and the rotation center line 3 a of the opening / closing center portion 3 is aligned with the blade 2 and the spacer 14. Although it is relatively rotatable about the center, it can be inserted into the detent hole 18 of the blade 1 to rotate integrally with the blade 1 about the rotation center line 3a. The set screw 16 is inserted from the support hole 12 of the blade 1 through the cover hole 19 and screwed to the support pin 15, and integrally connects the support pin 15 to the blade 1. The cover 17 is inserted into the cover hole 19 to cover the set screw 16. When the support pin 15 and the set screw 16 are tightened to each other, the inner surface 10 of the blade plate 8 on the base end side with respect to the rotation center line 3a is separated from each other by the contact point portion 29 and the support portion 28 of the support portion 27 of the spacer 14. The blade edge walls 11 of the blade plates 8 of the blade portions 4 and 5 are pressed against each other. In that case, the inner surface 10 of the blade plate 8 faces the lowest point portion 30 of the spacer 14 with a slight gap G or abuts on the distal end side of the rotation center line 3a. Incidentally, the interval W10 between the inner surfaces 10 of the blade plates 8 at the rotation center line 3a of the opening / closing center portion 3 is set to be larger than the interval W22 between the end surfaces 23a, 24a of both end portions 23, 24 of the spacer 14, and The distance W29 between the highest point portion 29a of the portion 29 and the end surface 24a of the end surface portion 24 is set smaller.
[0035]
A portion on the outer peripheral edge of both end portions 23 and 24 of the spacer body 22 and passing through an assumed surface Q connecting the highest point portion 29a of the contact point portion 29 and the rotation center line 3a of the opening / closing center portion 3 (touch point (The three parts other than the part 29), the locking part 32 may be formed in any part.
[0036]
For example, in another example of the first embodiment shown in FIG. 3B, a locking portion 32 is formed on the outer peripheral edge of the end face portion 24 on the distal end side from the rotation center line 3a. The locking portion 32 is a projection similar to the contact portion 29, and the distance L32 formed by the locking portion 32 with respect to the rotation center line 3a and the highest point portion 29a of the touch point portion 29 are determined by the rotation center line 3a Are set equal to each other. In this case, the distance of the locking portion 32 to the reference plane P and the distance of the touch point portion 29 to the reference plane P are made equal to each other, or the distances are changed. The locking portion 32 can also be used as a touching portion, or the touching portion 29 can also be used as a locking portion.
[0037]
Further, as the rotation preventing means, a protruding portion may be formed on the outer peripheral surface portion 25 of the spacer body 22 so that a flat portion of the protruding portion is locked to the blade plate 8.
[Brief description of the drawings]
1A is a plan view showing scissors according to a first embodiment, FIG. 1B is a partial cross-sectional view taken along line AA of FIG. 1A, and FIG. It is an exploded perspective view shown.
2A is a partially enlarged cross-sectional view taken along line BB of FIG. 1A, and FIG. 2B is a partially cross-sectional view taken along line CC of FIG. 1A.
3A is an explanatory view showing a spacer of FIG. 2A, and FIG. 3B is an explanatory view showing a spacer in another example of the first embodiment.
[Explanation of symbols]
1, 2 ... blade, 3 ... opening / closing center, 3a ... rotation center line, 4, 5 ... blade, 6, 7 ... handle, 8 ... blade, 10 ... inner surface of blade, 11 ... blade Blade edge wall, 14 spacer, 23, 24 end face, 23a, 24a end face, 25 outer peripheral face, 27, 28 support, 29 contact point, 29a highest point, 30 lowest point, 31: arm portion, 32: locking portion (rotation stopping means), 33: locking hole (rotation stopping means), P: reference surface, S: gap, Q: assumed surface, H29, H30: height, L29, L32 ... distance.

Claims

A pair of blades are rotatably supported at the opening / closing center, and a blade is provided at the distal end side of the opening / closing center, and a handle is provided at a base end side of the opening / closing center. Has a spacer sandwiched between the inner surfaces of the two blades, and at both end surfaces of the spacer facing the inner surfaces of the two blades, respectively, the base end side of the rotation center line of the opening and closing center portion. In the scissors provided with a support that comes into contact with the inner surface of both blades with
The two support portions are respectively provided on rigid portions provided on both end surface portions of the spacer, and the support portion on one end surface portion of both end surface portions of the spacer has a reference surface orthogonal to a rotation center line. An opening / closing center portion structure for scissors, comprising a contact point portion having a highest point portion having a predetermined height.

An end face portion provided with the contact point portion of both end face portions of the spacer was provided with a lowest point portion having a predetermined height with respect to the reference surface at a tip side from a rotation center line of the opening / closing center portion. The structure of the open / close center of the scissors according to claim 1.

Both end faces of the spacer have end faces provided in parallel to the reference plane and facing the inner surfaces of both blades, and a contact point portion having the highest point portion at one end face of both end faces of the spacer is The structure of the open / close center portion of the scissors according to claim 2, wherein the end portion is a projection protruding from the end surface, and the lowest point portion is provided on the end surface of the end surface portion provided with the contact point portion.

The said lowest point part is provided in the end surface of the end surface part in which the contact point part was provided on the surface which connects the highest point part of a contact point part and a rotation center line, The claim 4 characterized by the above-mentioned. Opening and closing center structure of scissors.

The difference between the height of the highest point portion and the height of the lowest point portion of the contact point portion is set to be 0.05 mm or more and 3 mm or less. Opening and closing center structure of scissors.

The scissors according to any one of claims 1 to 5, wherein a detent means is provided so that the spacer can rotate integrally with one of the two blades. The structure of the opening and closing central part.

A locking portion projecting toward the inner surface of one of the blades on one end face side of the both end face portions of the spacer at a tip end side from a rotation center line of the opening / closing center portion; 7. The structure of the open / close center portion of the scissors according to claim 6, further comprising a locking hole provided on an inner surface of one of the blades so that the stopping portion is engaged.

The detent means includes an arm portion protruding in a direction away from the rotation center line of the opening / closing center portion at an outer peripheral surface portion provided between both end surface portions in the spacer, and an arm portion formed on the inner surface of one blade with the arm portion. 7. The scissors according to claim 6, further comprising: a locking portion protruding toward the head; and a locking hole provided on an inner surface of one of the blades so that the locking portion is engaged. Central opening and closing structure.

A locking portion projecting toward the inner surface of one blade at the other end surface side opposite to the one end surface portion provided with the contact point portion among the both end surface portions of the spacer; 7. The structure of the open / close center portion of the scissors according to claim 6, further comprising a locking hole provided on an inner surface of one of the blades so that the locking portion is engaged.

The detent means includes a locking portion projecting toward the inner surface of one blade at one end surface of both end surfaces of the spacer, and an inner surface of one blade so that the locking portion is engaged. And a distance formed by the locking portion with respect to the rotation center line of the opening / closing center portion and a distance formed by the highest point of the touch point portion with respect to the rotation center line of the opening / closing center portion. 7. The structure of the open / close center of the scissors according to claim 6, wherein

The locking portion of the rotation preventing means is provided on a surface connecting a highest point portion of the contact point portion and a rotation center line of an opening / closing center portion. The structure of the open / close center of the scissors according to any one of claims.

The blade edges of the blades that are in sliding contact with each other at the time of opening and closing operations are blade walls protruding from the inner surface of the blade along the reference surface so as to face each other. The structure of the open / close center portion of the scissors according to any one of claims 1 to 11, wherein a gap is formed between the inner surfaces of the blade portions of both blades when the walls are in sliding contact with each other.