JP4210463B2

JP4210463B2 - Cylinder lock picking prevention mechanism

Info

Publication number: JP4210463B2
Application number: JP2002101874A
Authority: JP
Inventors: 直樹前田
Original assignee: 美和ロック株式会社
Priority date: 2002-04-03
Filing date: 2002-04-03
Publication date: 2009-01-21
Anticipated expiration: 2022-04-03
Also published as: JP2003293628A

Description

【０００１】
【発明の属する技術分野】
この発明は、シリンダ錠、最適の適用例としては本出願人が先に提案したロータリーディスクタンブラー錠、の内筒に設けるピッキング防止機構に関する。
【０００２】
【従来の技術】
本出願人は、先に、特願２００１−３１６８８５を以て、従来の所謂レバータンブラー錠（ロータリーディスクシリンダ錠）を改良した新規なロータリーディスクタンブラー錠を提案した。
【０００３】
このロータリーディスクタンブラー錠は、内周面の母線に沿ってカム溝を形成した外筒と、この外筒に回転自在に嵌合し、間隙を介して中心軸線方向に積層された複数の仕切板を設けると共に、中心軸線に沿って鍵孔を貫通させた内筒と、この内筒の母線に沿って延在し、内筒の外周部において半径方向に移動可能に案内されると共に、上記カム溝と係合する外側縁が外方に突出する方向に付勢されたロッキングバーとを有し、上記仕切板の間の各スロットに、中央部に鍵孔を包囲し得る大きさの鍵挿通孔を形成した環状のロータリーディスクタンブラーを挿設し、その実体部の１ヵ所を、内筒を軸線方向に貫通する支軸に揺動可能に軸支すると共に、自由端部外側端縁に解錠切欠を形成し、一方、鍵挿通孔の開口端縁に、先端の移動軌跡が鍵孔に挿入された合鍵のブレードの平面部又は端縁部と干渉する係合突起を一体に突設し、各ロータリーディスクタンブラーをこの係合突起が合鍵に近接する方向に付勢すると共に、常態では内筒を軸線方向に貫通するバックアップピンに係止し、他方、これらのタンブラー群の係合突起の夫々が鍵孔に挿通された合鍵のブレードに形成された対応する窪みと係合したとき、各ロータリーディスクタンブラーの解錠切欠がロッキングバーの内側縁と整合するようにしたことを特徴とするものである。
【０００４】
上記したロータリーディスクタンブラー錠の構成を更に要約すると、図１に示すように、中央部に鍵孔を包囲し得る大きさの鍵挿通孔１を形成した環状のロータリーディスクタンブラー２を支軸３に揺動可能に軸支すると共に、自由端部外側端縁に解錠切欠４を形成し、一方、鍵挿通孔１の開口端縁に、先端の移動軌跡が鍵孔５に挿入された合鍵６のブレードの平面部又は端縁部と干渉する係合突起７を一体に突設し、各ロータリーディスクタンブラー２をこの係合突起７が合鍵６に近接する方向に付勢すると共に、常態ではバックアップピン８に係止し、他方、これらのタンブラー群の係合突起の夫々が鍵孔５に挿通された合鍵６のブレードに形成された対応する窪み９と係合したとき、各ロータリーディスクタンブラーの解錠切欠４をロッキングバー１１の内側縁と整合させるものである。
【０００５】
【発明が解決しようとする課題】
この発明は、上記した構成の新規なロータリーディスクタンブラー錠を改良しようとするものではなく、これに新規なピッキング防止機構を付加することによりピッキングをより困難にし、錠前としてのロータリーディスクタンブラー錠の安全性を更に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】
上記の目的を達成するため、請求項１に記載の発明は、ロータリーディスクタンブラー錠の内筒を構成するキーガイド、仕切板Ｂ及びテールプラグの内少なくとも二つを選択してこれらを案内部材とし、これらの案内部材の相互に対向する面の夫々に、支軸を挟んで相互に平行に配設され、一端が鍵孔に連通する一対の案内溝を形成し、各案内溝に探りピンを長さ方向に移動可能に収納し、一方、上記選択された案内部材の間における仕切板の、支軸より外側の部分を切り欠いて断面蒲鉾形の空間を形成し、この空間内に、ロータリーディスクタンブラーの基端部を覆うようにして、薄い蒲鉾状の制御体を、その厚さ方向であるシリンダ錠の半径方向に移動可能に配設し、この制御体のシリンダ錠中心軸に対向する側の係止面に跨がられているロータリーディスクタンブラーの基端部の形状を、鍵孔に合鍵が挿入されていない常態において、上記支軸より外側の部分を切り欠いた仕切板の切欠線より外側に出ないように、かつ、支軸を時計盤面に換算して１２時の角度位置においたシリンダ錠の横断面において、制御体の係止面との接触部が左右にずれるように設定し、また、制御体の前端及び後端に突設された一対の連結突起の夫々を、案内溝の他端部に挿入するようにして探りピンに係合させ以て、合鍵を鍵孔に挿入したとき、２対の探りピンの移動により制御体を厚さ方向に平行移動させ、ロータリーディスクタンブラーの基端と制御体の係止面との間に隙間を生じさせて案内部材間のロータリーディスクタンブラーを自由にし、一方、合鍵を挿入せずに鍵孔内に露呈するロータリーディスクタンブラーをピッキング工具により鍵厚方向に移動させようとするとき、制御体の係止面との係合によりロータリーディスクタンブラーをロックし、ピッキングを不可能にしたことを特徴とする。
【０００７】
また、請求項２に記載の発明は、レバータンブラー錠の内筒を構成するキーガイド、仕切板Ｂ及びテールプラグの内少なくとも二つを選択してこれらを案内部材とし、これらの案内部材の相互に対向する面の夫々に、支軸を挟んで相互に平行に配設され、一端が鍵孔に連通する一対の案内溝を形成し、各案内溝に探りピンを長さ方向に移動可能に収納し、一方、上記選択された案内部材の間における仕切板の、支軸より外側の部分を切り欠いて断面蒲鉾形の空間を形成し、この空間内に、レバータンブラーの基端部を覆うようにして、薄い蒲鉾状の制御体を、その厚さ方向であるシリンダ錠の半径方向に移動可能に配設し、この制御体のシリンダ錠中心軸に対向する側の係止面に跨がられているレバータンブラーの基端部の形状を、鍵孔に合鍵が挿入されていない常態において、上記支軸より外側の部分を切り欠いた仕切板の切欠線より外側に出ないように、かつ、支軸を時計盤面に換算して１２時の角度位置においたシリンダ錠の横断面において、制御体の係止面との接触部が左右にずれるように設定し、また、制御体の前端及び後端に突設された一対の連結突起の夫々を、案内溝の他端部に挿入するようにして探りピンに係合させ以て、合鍵を鍵孔に挿入したとき、２対の探りピンの移動により制御体を厚さ方向に平行移動させ、レバータンブラーの基端と制御体の係止面との間に隙間を生じさせて案内部材間のレバータンブラーを自由にし、一方、合鍵を挿入せずに鍵孔内に露呈するレバータンブラーをピッキング工具により鍵厚方向に移動させようとするとき、制御体の係止面との係合によりレバータンブラーをロックし、ピッキングを不可能にしたことを特徴とする。
【０００８】
更にまた、請求項３に記載の発明は、上記案内溝を、鍵孔に挿入される合鍵の厚さ方向に延在するように配設したことを特徴とする。
【０００９】
また、請求項４に記載の発明は、上記制御体を、探りピンに近接する方向に付勢したことを特徴とする。
【００１０】
加えて、請求項５に記載の発明は、上記案内溝にストッパーを設け、鍵孔に合鍵を挿入しない常態において探りピンの長さ方向の位置を一定位置に規制するようにしたことを特徴とする。
【００１１】
また、請求項６に記載の発明は、上記制御体の連結突起の横断面形状を矩形にしたことを特徴とする。
【００１２】
【実施例】
以下、この発明の実施例を図２乃至図６を参照して説明する。
図２及び図３において符号１２はシリンダ錠（図示の実施例ではロータリーディスクタンブラー錠）の外筒を、符号１３は内筒を夫々示し、シリンダ錠では、内筒１３は外筒１２に回動可能に嵌合している。
【００１３】
また、図２において符号１４はキーガイドを、符号１５はテールプラグを夫々示し、シリンダ錠の内筒１３は、キーガイド１４及びテールプラグ１５の間に複数の仕切板１６、１６を挿設し、これらをリテーナ１７、１７（図３参照）により相互に結合して構成される。
【００１４】
上記シリンダ錠の内筒の構造は従来周知であるから、更に詳細な発明は省略する。
【００１５】
なお、図２に示すように、内筒の前端部（図２で右端部）付近における仕切板は少し厚くなっていて、その図２における下端部には、前記ロッキングバー１１を外筒のカム溝１９（図３参照）に弾圧するためのロッキングバーばね２１が弾装されている。
【００１６】
なお、上記ロッキングバーばね２１を担持した厚い仕切板を、他の仕切板１６と区別するため、以下仕切板Ｂと称することにする。
【００１７】
そして、図示の実施例では、キーガイド１４及び仕切板Ｂ２２が案内部材として選択され、これらの案内部材の相互に対向する面の夫々に、図４に示すように、一対の案内溝２３、２３が形成されている。
【００１８】
各案内溝２３は、図４に示すように、支軸３を挟んで相互に平行になるように配設され、上下方向に延在するように、換言すれば、鍵孔５に挿入される合鍵の厚さ方向に延在するように形成されている。
【００１９】
また、図示の実施例では、各案内溝２３の横断面形状はコ字形であり、更にまた、その一端（図４で下端）は鍵孔５に連通し、他端は外周端縁に開口している。
【００２０】
上記し、また図４に示す案内部材は仕切板Ｂ２２であるが、他方の案内部材であるキーガイド１４においても、同様に一対の案内溝２３、２３が形成されており、その形状や形成の態様も仕切板Ｂ２２におけると同様である。
【００２１】
各案内溝２３には、両端を丸め、鍵孔５側の一端部をくびれさせた（図３参照）探りピン２４がその長さ方向に移動可能に収納されている。
【００２２】
上記くびれ部は、案内溝２３に近接し、かつその一部を案内溝２３中に突出させる態様で（図４参照））制御体に埋設された円板２５と係合し、探りピン２４が鍵孔中に落込むことを防止している。
【００２３】
なお、探りピン２４にくびれ部を設けず、その代わりに案内溝２３の鍵孔との連接部をかしめにより少し狭めれば、同様に探りピン２４の位置の規制を行うことができる。
【００２４】
一方、図２及び図３に示すように、キーガイド１４としきり板Ｂ２２に挟まれた３枚のロータリーディスクタンブラー２、２の上部を覆うようにして、制御体２６が配設されている。
【００２５】
図示の実施例では、制御体２６は薄い蒲鉾状のブロック体であり、その両端に突設された一対の異形（図示の実施例では方形）断面の連結突起２７を案内溝２３中に挿入する態様で、４本の探りピン２４、２４の他端と係合している。
【００２６】
また、図２に示すように、制御体２６は、その上面中央部には形成された有底のばね穴（付番せず）と、このばね穴に開口部を挿入するようにして摺動可能に嵌合するカップ状のばね押え２８との間には、圧縮コイルばねとしての制御ばね２９が弾装されており、この制御ばね２９の弾力により、制御体２６は探りピン２４、２４に近接する方向に付勢されている。
【００２７】
なお、制御体２６との干渉を避けるため、キーガイド１４と仕切板Ｂ２２との間における仕切板１６、１６は上部を切り欠かれており（図示せず）、また、図５に示すように、制御体２６に跨がられている３枚のロータリーディスクタンブラー２、２は、鍵孔に合鍵が挿入されていない常態において、仕切板１６の切り欠き線３１より上部に出ないようにその形状が定められている。
【００２８】
上記のように構成されたこの発明の一実施例によるシリンダ錠のピッキング防止機構は、図３に示すように、各探りピン２４の一端（下端）は鍵孔５中に少し係入した状態でこれに臨んでいる。
【００２９】
通常の施解錠操作では、図６に示すように先端を対称的に丸め、かつ先端に傾斜縁３１（図２参照）を形成した合鍵６を鍵孔に挿入するから、図３に示す左右一対の探りピン２４、２４は、その一端と合鍵先端の傾斜縁３１との間に生じる楔作用により同時に押し上げられる。
【００３０】
したがって、合鍵の挿入の始めに制御体２６が一時的に、かつ前後方向において傾く、という動きはあるが、やがて内方の探りピン２４、２４の組も同様に押し上げられ、以降探りピン２４と合鍵のブレードとが摺接しつつ円滑に挿入ができる。
【００３１】
探りピン２４、２４の移動によって制御体２６が押し上げられると（図示せず）、換言すれば、ロータリーディスクタンブラー２、２と制御体２６との間に隙間ができると、図２で入口の３枚のタンブラーが自由になるから、通常のロータリーディスクタンブラー錠と同様に施解錠操作が円滑に行われる。
【００３２】
一方、ピッキングのため細い工具を鍵孔に挿入してロータリーディスクタンブラー２の前記係合突起７（図１参照）を鍵厚方向に移動させようとすると、入口近くにある探りピン２４を鍵孔から排除する動作が先ず面倒である。
【００３３】
その上、図５から明らかなように、タンブラー２と制御体の係止面３２（図３参照）の接触部が制御体２６の図３における中心から左右にずれるので、制御体２６にモーメントが掛かり、このようなモーメントに対して制御体は移動しないから、タンブラー２はロックされてしまい、ピッキングは原理上不可能となる。
【００３４】
これを別な言い方で再度説明すると、図３から明らかなように、タンブラー２は支軸３の回りを回動可能に支承されているから、タンブラーを回動させたときの上記係止面３２との接触部は支軸の真上ではあり得ず、したがって支軸３に関し対称的に設けられている制御体２６にモーメントが生じるのである。
【００３５】
制御体２６を探りピン２４から離間させてタンブラーをロックさせようとしても、そのためには探りピン２４の一端を案内溝２３の鍵孔５における開口より内方に移動させ、かつその状態を保持させなければならず、そのような操作を４本の探りピンに施すことは不可能である。
【００３６】
なお、この発明は、図示の実施例に限定されず種々に変形して実施することが可能である。例えば、環状のロータリーディスクタンブラー２の代りにＣ字形のレバータンブラーを組込んだ従来の所謂レバータンブラー錠にもこの発明を適用することができる。
【００３７】
また、図示の実施例では制御体２６を制御ばね２９の弾力により探りピン２４方向に付勢するものとしたが、図３に示すようにロータリーディスクタンブラー錠を扉に装着すると、制御体２６は重力により探りピン方向に付勢されるから、制御ばね２９を特に設ける必要はない。
【００３８】
更にまた、図示の実施例では案内部材としてキーガイド１４と仕切板Ｂ２２とを選択するものとしたが、案内部材として仕切板Ｂ２２とテールプラグ１５とを選択してもよく、或いはキーガイド１４とテールプラグ１５とを選択してもよい。
【００３９】
【発明の効果】
以上の説明から明らかなように、この発明は、案内部材の相互に対向する面の夫々に、支軸を挟んで相互に平行に配設され、一端が鍵孔に連通する一対の案内溝を形成し、各案内溝に探りピンを長さ方向に移動可能に収納すると共に、タンブラーの基端部に近接する係止面を有する制御体を、その前端及び後端に突設された一対の連結突起の夫々を案内溝の他端部に挿入するようにして、探りピンに係合させたので、ピッキング時タンブラーがロックされてこれを動かすことができず、したがってピッキングが原理上不可能になる、という所期の効果を奏する。
【図面の簡単な説明】
【図１】ロータリーディスクタンブラー錠の構成を説明するための横断面図。
【図２】この発明によるピッキング防止機構を組込んだロータリーディスクタンブラー錠の縦断面図。
【図３】この発明によるピッキング防止機構の正面図。
【図４】仕切板Ｂの正面図。
【図５】ロータリーディスクタンブラー錠の横断面図。
【図６】合鍵の平面図。
【符号の説明】
１鍵挿通孔
２ロータリーディスクタンブラー
３支軸
４解錠切欠
５鍵孔
６合鍵
７係合突起
８バックアップピン
９窪み
１１ロッキングバー
１２外筒
１３内筒
１４キーガイド
１５テールプラグ
２２仕切板Ｂ
２３案内溝
２４探りピン
２６円板
２７連結突起
２９制御ばね
３２係止面[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a picking prevention mechanism provided in an inner cylinder of a cylinder lock and, as an optimum application example, a rotary disc tumbler lock previously proposed by the present applicant.
[0002]
[Prior art]
The present applicant has previously proposed a novel rotary disk tumbler lock improved from the so-called lever tumbler lock (rotary disk cylinder lock) according to Japanese Patent Application No. 2001-316885.
[0003]
The rotary disk tumbler lock includes an outer cylinder having a cam groove formed along a generatrix of the inner peripheral surface, and a plurality of partition plates that are rotatably fitted to the outer cylinder and stacked in the central axis direction through a gap. An inner cylinder having a key hole extending along the central axis, and extending along a generatrix of the inner cylinder, and guided in a radially movable manner on the outer periphery of the inner cylinder, and the cam A locking bar biased in a direction in which an outer edge engaged with the groove protrudes outward, and a key insertion hole of a size capable of enclosing the key hole in a central portion in each slot between the partition plates Insert the formed annular rotary disk tumbler and pivotally support one part of its substantial part on a support shaft that penetrates the inner cylinder in the axial direction and unlocks the notch on the outer edge of the free end. On the other hand, the movement trajectory of the tip is at the opening edge of the key insertion hole. Engagement protrusions that interfere with the flat part or edge part of the keyed blade inserted into the hole are integrally projected, and each rotary disk tumbler is urged in the direction in which the engagement protrusions are close to the keyed key, and in a normal state. Then, when the inner cylinder is locked to the backup pin penetrating in the axial direction, on the other hand, when each of the engaging projections of these tumbler groups is engaged with the corresponding recess formed in the keyed blade inserted through the key hole. The unlocking notch of each rotary disk tumbler is aligned with the inner edge of the locking bar.
[0004]
To further summarize the structure of the rotary disk tumbler lock described above, as shown in FIG. 1, an annular rotary disk tumbler 2 having a key insertion hole 1 of a size capable of enclosing the key hole at the center is provided on the support shaft 3. The unlocking notch 4 is formed on the outer end edge of the free end portion while being pivotably supported, and on the other hand, a joint key 6 in which the movement locus of the tip is inserted into the key hole 5 at the opening edge of the key insertion hole 1. Engaging projections 7 that interfere with the flat portion or the edge of the blade of the blade are integrally projected, and each rotary disk tumbler 2 is urged in the direction in which the engaging projections 7 approach the joint key 6 and is normally backed up. When each of the engaging protrusions of the tumbler group is engaged with the corresponding recess 9 formed in the blade of the key 6 inserted through the key hole 5, each of the rotary disk tumblers is locked. Unlock notch 4 It is intended to match with the inner edge of the king bar 11.
[0005]
[Problems to be solved by the invention]
The present invention is not intended to improve the novel rotary disk tumbler lock having the above-described configuration, and by adding a novel anti-picking mechanism to this, making picking more difficult, the safety of the rotary disk tumbler lock as a lock is improved. The purpose is to further improve the performance.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 selects at least two of the key guide, the partition plate B, and the tail plug constituting the inner cylinder of the rotary disc tumbler lock as a guide member. A pair of guide grooves that are arranged in parallel to each other across the support shaft and that have one end communicating with the key hole are formed on the mutually facing surfaces of these guide members, and a probe pin is provided in each guide groove. On the other hand, a part of the partition plate between the selected guide members is stored so as to be movable in the length direction, and a part outside the support shaft is cut out to form a space having a cross-sectional shape. A thin hook-shaped control body is disposed so as to cover the base end portion of the disk tumbler so as to be movable in the radial direction of the cylinder lock, which is the thickness direction, and faces the cylinder lock central axis of the control body. Straddled on the side locking surface The shape of the base end of the rotary disc tumbler should be such that it does not protrude outside the notch line of the partition plate with the portion outside the support shaft cut out in a normal state where the key is not inserted into the keyhole. In the cross section of the cylinder lock in which the shaft is converted to the clock face at the 12 o'clock angle position, the contact portion with the locking surface of the control body is set to be shifted left and right, and the front and rear ends of the control body When the key is inserted into the key hole by inserting each of the pair of connecting projections projecting from the guide pin into the other end of the guide groove and engaging the probe pin, the two pairs of probe pins are moved. To move the control body in the thickness direction and create a gap between the base end of the rotary disk tumbler and the locking surface of the control body to free the rotary disk tumbler between the guide members, while inserting the key Without being exposed to the keyhole When it is intended to move in KagiAtsu direction by picking tool tally disc tumbler locks the rotary disc tumbler by the engagement between the locking surface of the control body, characterized in that it impossible to picking.
[0007]
According to the second aspect of the present invention, at least two of the key guide, the partition plate B, and the tail plug constituting the inner cylinder of the lever tumbler lock are selected and used as guide members. A pair of guide grooves that are arranged in parallel to each other across the support shaft and that have one end communicating with the key hole are formed on each of the surfaces facing each other, and the probe pin can be moved in the length direction in each guide groove On the other hand, a space outside the support shaft of the partition plate between the selected guide members is cut out to form a space with a cross-sectional shape, and the base end portion of the lever tumbler is covered in this space. Thus, the thin hook-shaped control body is disposed so as to be movable in the radial direction of the cylinder lock, which is the thickness direction, and straddles the locking surface on the side facing the cylinder lock central axis of the control body. Align the shape of the base end of the lever tumbler with the keyhole. In a normal state in which no shaft is inserted, the support shaft is converted into a clock face so that it does not come out from the notch line of the partition plate that is cut out at a portion outside the support shaft, and is placed at an angular position of 12 o'clock. In the cross section of the cylinder lock, it is set so that the contact portion with the locking surface of the control body is shifted to the left and right, and each of the pair of connecting projections protruding from the front end and the rear end of the control body is connected to the guide groove. When the key is inserted into the keyhole by engaging with the probe pin so that it is inserted into the other end of the lever, the control body is translated in the thickness direction by the movement of the two pairs of probe pins, and the lever tumbler A gap is created between the base end and the locking surface of the control body to free the lever tumbler between the guide members. On the other hand, the lever tumbler exposed in the keyhole without inserting the key is locked with the picking tool. When trying to move in the direction, Lock the lever tumblers by the engagement between the surface, characterized in that it impossible to picking.
[0008]
Furthermore, the invention described in claim 3 is characterized in that the guide groove is arranged so as to extend in the thickness direction of the key inserted into the key hole.
[0009]
According to a fourth aspect of the present invention, the control body is biased in a direction approaching the search pin.
[0010]
In addition, the invention according to claim 5 is characterized in that a stopper is provided in the guide groove, and the position of the probe pin in the length direction is restricted to a fixed position in a normal state where no key is inserted into the key hole. To do.
[0011]
The invention according to claim 6 is characterized in that the cross-sectional shape of the connecting projection of the control body is rectangular.
[0012]
【Example】
Embodiments of the present invention will be described below with reference to FIGS.
2 and 3, reference numeral 12 denotes an outer cylinder of a cylinder lock (rotary disc tumbler lock in the illustrated embodiment), reference numeral 13 denotes an inner cylinder, and in the cylinder lock, the inner cylinder 13 rotates to the outer cylinder 12. It is possible to fit.
[0013]
In FIG. 2, reference numeral 14 indicates a key guide, and reference numeral 15 indicates a tail plug. The inner cylinder 13 of the cylinder lock has a plurality of partition plates 16 and 16 inserted between the key guide 14 and the tail plug 15. These are configured to be coupled to each other by retainers 17 and 17 (see FIG. 3).
[0014]
Since the structure of the inner cylinder of the cylinder lock is well known in the art, further detailed invention is omitted.
[0015]
As shown in FIG. 2, the partition plate in the vicinity of the front end portion (right end portion in FIG. 2) of the inner cylinder is slightly thicker, and the locking bar 11 is attached to the cam of the outer cylinder at the lower end portion in FIG. A rocking bar spring 21 is elastically mounted in the groove 19 (see FIG. 3).
[0016]
The thick partition plate carrying the locking bar spring 21 is hereinafter referred to as a partition plate B in order to distinguish it from the other partition plates 16.
[0017]
In the illustrated embodiment, the key guide 14 and the partition plate B22 are selected as guide members, and a pair of guide grooves 23, 23 are formed on the mutually facing surfaces of these guide members as shown in FIG. Is formed.
[0018]
As shown in FIG. 4, the guide grooves 23 are arranged so as to be parallel to each other with the support shaft 3 interposed therebetween. In other words, the guide grooves 23 are inserted into the key holes 5 so as to extend in the vertical direction. It is formed so as to extend in the thickness direction of the key.
[0019]
In the illustrated embodiment, the cross-sectional shape of each guide groove 23 is U-shaped, and further, one end (the lower end in FIG. 4) communicates with the key hole 5 and the other end opens at the outer peripheral edge. ing.
[0020]
The guide member shown in FIG. 4 is the partition plate B22, but the key guide 14 which is the other guide member is similarly formed with a pair of guide grooves 23 and 23, and the shape and formation of the guide grooves 23 and 23 are the same. The aspect is the same as that in the partition plate B22.
[0021]
Each guide groove 23 accommodates a probe pin 24 which is rounded at both ends and constricted at one end portion on the key hole 5 side (see FIG. 3) so as to be movable in its length direction.
[0022]
The constricted portion is in close proximity to the guide groove 23 and a part of the constricted portion protrudes into the guide groove 23 (see FIG. 4). Prevents falling into the keyhole.
[0023]
In addition, if the constriction part is not provided in the search pin 24, but the connection part with the key hole of the guide groove 23 is narrowed a little by caulking instead, the position of the search pin 24 can be similarly controlled.
[0024]
On the other hand, as shown in FIGS. 2 and 3, a control body 26 is disposed so as to cover the upper portions of the three rotary disc tumblers 2 and 2 sandwiched between the key guide 14 and the plate B22.
[0025]
In the illustrated embodiment, the control body 26 is a thin bowl-shaped block body, and a pair of deformed (rectangular in the illustrated embodiment) cross-section connecting protrusions 27 projecting from both ends thereof are inserted into the guide groove 23. In the embodiment, the other end of the four probe pins 24, 24 is engaged.
[0026]
In addition, as shown in FIG. 2, the control body 26 slides with a bottomed spring hole (not numbered) formed in the center of the upper surface, and an opening is inserted into the spring hole. A control spring 29 as a compression coil spring is elastically mounted between the cup-shaped spring presser 28 that can be fitted, and the control body 26 is attached to the search pins 24 and 24 by the elasticity of the control spring 29. It is energized in the approaching direction.
[0027]
In order to avoid interference with the control body 26, the partition plates 16 and 16 between the key guide 14 and the partition plate B22 are notched (not shown), and as shown in FIG. The three rotary disc tumblers 2 and 2 straddling the control body 26 are shaped so that they do not protrude above the notch line 31 of the partition plate 16 in a normal state where the key is not inserted into the key hole. Is stipulated.
[0028]
The cylinder lock picking prevention mechanism according to one embodiment of the present invention constructed as described above has a state in which one end (lower end) of each probe pin 24 is slightly engaged in the key hole 5, as shown in FIG. I'm facing this.
[0029]
In a normal locking / unlocking operation, as shown in FIG. 6, the joint key 6 having the tip rounded symmetrically and having the tip formed with an inclined edge 31 (see FIG. 2) is inserted into the keyhole. The probing pins 24, 24 are simultaneously pushed up by a wedge action generated between one end of the probing pins 24 and the inclined edge 31 at the leading end of the key.
[0030]
Therefore, although there is a movement that the control body 26 is tilted temporarily and in the front-rear direction at the beginning of insertion of the joint key, the pair of the inner search pins 24, 24 is eventually pushed up in the same manner. It can be smoothly inserted while sliding against the key blade.
[0031]
If the control body 26 is pushed up by the movement of the search pins 24, 24 (not shown), in other words, if there is a gap between the rotary disk tumblers 2, 2 and the control body 26, the inlet 3 in FIG. Since the tumbler of the sheet becomes free, the locking / unlocking operation is smoothly performed in the same manner as a normal rotary disk tumbler lock.
[0032]
On the other hand, when a thin tool is inserted into the keyhole for picking and the engagement protrusion 7 (see FIG. 1) of the rotary disc tumbler 2 is moved in the key thickness direction, the probe pin 24 near the entrance is moved to the keyhole. First of all, the operation to eliminate from is troublesome.
[0033]
In addition, as is apparent from FIG. 5, the contact portion between the tumbler 2 and the locking surface 32 (see FIG. 3) of the control body is shifted from the center of the control body 26 in FIG. As a result, the control body does not move with respect to such a moment, so the tumbler 2 is locked and picking is impossible in principle.
[0034]
This will be described again in another way. As is apparent from FIG. 3, the tumbler 2 is supported so as to be rotatable around the support shaft 3, so that the locking surface 32 when the tumbler is rotated is described. The contact portion cannot be directly above the support shaft, and therefore a moment is generated in the control body 26 provided symmetrically with respect to the support shaft 3.
[0035]
Even if the control body 26 is moved away from the probe pin 24 to try to lock the tumbler, one end of the probe pin 24 is moved inward from the opening in the key hole 5 of the guide groove 23 and the state is maintained. It is impossible to apply such an operation to the four search pins.
[0036]
Note that the present invention is not limited to the illustrated embodiment, and can be implemented with various modifications. For example, the present invention can be applied to a conventional so-called lever tumbler lock in which a C-shaped lever tumbler is incorporated instead of the annular rotary disc tumbler 2.
[0037]
In the illustrated embodiment, the control body 26 is urged in the direction of the search pin 24 by the elasticity of the control spring 29. However, when the rotary disk tumbler lock is attached to the door as shown in FIG. Since it is biased in the direction of the probe pin by gravity, it is not necessary to provide the control spring 29 in particular.
[0038]
Furthermore, in the illustrated embodiment, the key guide 14 and the partition plate B22 are selected as the guide member, but the partition plate B22 and the tail plug 15 may be selected as the guide member, or the key guide 14 and The tail plug 15 may be selected.
[0039]
【The invention's effect】
As is apparent from the above description, the present invention has a pair of guide grooves that are arranged in parallel to each other on both sides of the guide member so as to sandwich the support shaft and one end communicates with the key hole. And a control body having a locking surface close to the base end portion of the tumbler, and a control body having a locking surface proximate to the base end portion of the tumbler. Since each of the connecting protrusions is inserted into the other end of the guide groove and engaged with the probe pin, the tumbler is locked during picking and cannot be moved, and therefore picking is impossible in principle. It has the expected effect of becoming.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view for explaining a configuration of a rotary disc tumbler lock.
FIG. 2 is a longitudinal sectional view of a rotary disc tumbler lock incorporating a picking prevention mechanism according to the present invention.
FIG. 3 is a front view of a picking prevention mechanism according to the present invention.
4 is a front view of a partition plate B. FIG.
FIG. 5 is a cross-sectional view of a rotary disc tumbler lock.
FIG. 6 is a plan view of a joint key.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Key insertion hole 2 Rotary disk tumbler 3 Spindle 4 Unlocking notch 5 Key hole 6 Joint key 7 Engagement protrusion 8 Backup pin 9 Depression 11 Locking bar 12 Outer cylinder 13 Inner cylinder 14 Key guide 15 Tail plug 22 Partition plate B
23 Guide groove 24 Search pin 26 Disk 27 Connection protrusion 29 Control spring 32 Locking surface

Claims

At least two of the key guide, partition plate B, and tail plug constituting the inner cylinder of the rotary disk tumbler lock are selected and used as guide members, and the support shafts are respectively provided on the mutually facing surfaces of these guide members. A pair of guide grooves that are arranged in parallel with each other with one end communicating with the key hole are formed, and a probe pin is movably accommodated in each guide groove, while the selected guide is A part of the partition plate between the members outside the support shaft is cut out to form a space with a cross-sectional shape, and in this space, the base end of the rotary disk tumbler is covered so as to control a thin hook The base of the rotary disc tumbler is arranged so that the body is movable in the radial direction of the cylinder lock, which is the thickness direction, and straddles the locking surface on the side opposite to the cylinder lock central axis of the control body. The shape of the part is the key In the normal state in which the key is not inserted, the angular position at 12 o'clock is calculated so that it does not come out of the notch line of the partition plate with the portion outside the support shaft cut out, and the support shaft is converted into a clock face. In the cross section of the cylinder lock placed, the contact portion with the locking surface of the control body is set so as to shift to the left and right, and each of the pair of connecting projections protruding from the front end and the rear end of the control body , When the key is inserted into the key hole by engaging the probe pin so that it is inserted into the other end of the guide groove, the control body is translated in the thickness direction by the movement of the two pairs of probe pins. A clearance is created between the base end of the disc tumbler and the locking surface of the control body to free the rotary disc tumbler between the guide members, while the rotary disc tumbler exposed in the keyhole without inserting the key Key with picking tool When it is intended to move in a direction, the control of locking the rotary disc tumbler by engagement of the locking surface, the cylinder lock picking preventing mechanism, characterized in that it impossible to picking.

At least two of the key guide, the partition plate B, and the tail plug constituting the inner cylinder of the lever tumbler lock are selected as guide members, and the support shafts are respectively provided on the mutually facing surfaces of these guide members. A pair of guide grooves which are arranged in parallel with each other and whose one end communicates with the key hole is formed, and a probe pin is movably accommodated in each guide groove, while the selected guide member is selected. A part of the partition plate outside the support shaft is cut out to form a saddle-shaped space, and a thin saddle-like control body is formed in this space so as to cover the base end of the lever tumbler. The shape of the base end portion of the lever tumbler that is disposed so as to be movable in the radial direction of the cylinder lock, which is the thickness direction, and straddles the locking surface on the side facing the cylinder lock central axis of this control body In a normal condition where no key is inserted into the keyhole. In the cross section of the cylinder lock in which the support shaft is converted into a clock face so that it does not protrude outside the notch line of the partition plate that is cut out at a portion outside the support shaft, and at the 12 o'clock angle position, contact portion between the locking surface of the control body is set to be shifted to the right and left, also, the respective pair of connecting protrusions projecting from the front end and the rear end of the control member is inserted into the other end portion of the guide groove Thus, when the key is inserted into the keyhole by engaging the probe pin, the control body is translated in the thickness direction by the movement of the two pairs of probe pins, and the relationship between the base end of the lever tumbler and the control body A gap is created between the stop surface and the lever tumbler between the guide members is free. On the other hand, the lever tumbler exposed in the keyhole is moved in the key thickness direction by the picking tool without inserting the key. When the lever tumbles by engagement with the locking surface of the control body Cylinder lock picking preventing mechanism, characterized in that to lock the over was impossible picking.

3. The picking prevention mechanism for a cylinder lock according to claim 1 or 2, wherein the guide groove is disposed so as to extend in a thickness direction of the key inserted into the key hole.

The picking prevention mechanism for a cylinder lock according to any one of claims 1 to 3, wherein the control body is urged in a direction close to a probe pin.

The cylinder lock according to any one of claims 1 to 4, wherein a stopper is provided in the guide groove, and the position in the length direction of the probe pin is restricted to a fixed position in a normal state in which the key is not inserted into the key hole. mechanism.

6. The picking prevention mechanism for a cylinder lock according to claim 1, wherein the connecting projection of the control body has a rectangular cross-sectional shape.