JP2004324141A

JP2004324141A - Key convertible type pin tumbler lock

Info

Publication number: JP2004324141A
Application number: JP2003118063A
Authority: JP
Inventors: Seitei Rin; 林聖庭
Original assignee: KOKO KIGYO YUGENKOSHI; Max Co Ltd
Current assignee: KOKO KIGYO YUGENKOSHI; Max Co Ltd
Priority date: 2003-04-23
Filing date: 2003-04-23
Publication date: 2004-11-18

Abstract

<P>PROBLEM TO BE SOLVED: To provide a key convertible type pin tumbler lock at a low cost even if it is produced by a multiple types and a small quantity. <P>SOLUTION: The key convertible type pin tumbler lock is equipped with a casing 10, a first rotational body 20, a second rotational body 30 and a fixed body 40, and when operator's circular keys 501 and 502 are inserted into key-holes, both rotational bodies 20 and 30 are connected to each other in a monolithically rotatable manner, at the same time, the second rotational body 30 can be relatively rotated to the fixed body 40, and when convertible circular keys 601 and 602 are inserted into the key-holes, the first rotational body 20 can be relatively rotated to the second rotational body 30, and the second rotational body 30 is connected to the fixed body 40 irrotationally, and when the convertible circular keys 601 and 602 are inserted into the key-holes to rotate the first rotational body 20 at a predetermined angle, it is so constituted that a row of a first penetration pin hole 25 is drawn up in a row of a first blind hole to enable a spacer 86 of the first blind hole 37 to move into the first penetration pin hole 25. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は鍵変換式ピンタンブラー錠に関する。
【０００２】
【従来の技術】
パチンコ機やスロット機を設置したホールでは各従業員に共通の鍵を持たせ、この鍵を使ってパチンコ機等の窓枠に取り付けられているピンタンブラー錠を開閉する。このようなピンタンブラー錠では、共通鍵の一個を紛失すると、その鍵の悪用を防止するため店内のパチンコ機等の錠全ての交換を余儀なくされるが、これには多大のコストを要する。そのため、パチンコ機等のピンタンブラー錠には共通鍵を紛失したとき、変換用鍵を使って錠内部のタンブラーピンの配列を変換し、これにより紛失した鍵ではもはや錠の開閉を不可能にし、別の鍵でしか開閉できないようにできる鍵変換式ピンタンブラー錠が広く用いられている。
【０００３】
この種の鍵変換式ピンタンブラー錠の一形式として、特開平８−２８４５００号公報には、ケーシングと固定体及び回転体を備え、固定体に中心貫通孔とその周囲に有底ピン孔の列を形成し、回転体に錠軸を凸設し、錠軸の周囲に貫通ピン孔の列を形成し、固定体をケーシング内に固定するとともに回転体を装着し、錠軸を固定体の中心貫通孔に挿入してケーシング外部に突出させ、固定体の有底ピン孔にスプリングとドライブピンを挿入し、回転体の貫通ピン孔にコードピンを挿入し、一本のドライブピンの先端部に小径部を形成してその部分から破断可能にしたピンタンブラー錠が開示されている。
【０００４】
この鍵変換式ピンタンブラー錠では、元のオペレーター用丸鍵と同じカム溝を形成した第１変換用丸鍵をケーシングの鍵穴に挿入して所定角度回転させ、その位置で第１変換用丸鍵を抜き出し、次ぎに第２変換用丸鍵を挿入して元の位置まで回転させると、一本のドライブピンの先端部が破断して破断部分が回転体の貫通ピン孔の一つに移動し、その貫通ピン孔のコードピンの見かけの長さが破断部分の寸法分だけ長くなる。このため、元のオペレーター用丸鍵は使用不能となり、第２変換用丸鍵と同じカム溝を形成した別のオペレーター用丸鍵が使用可能となる。
【０００５】
【発明が解決しようとする課題】
ところで、パチンコ機やスロット機に使われている従来の鍵変換式ピンタンブラー錠では、例えば回転体に６本の貫通ピン孔を形成するとともにＮｏ．１〜Ｎｏ．４の４種類の長さの異なるコードピンを用意しておき、６桁の乱数に基づいて各貫通ピン孔に４種類から選択した１本のコードピンを挿入して組み立てられている。そして顧客毎に乱数が指定され、他の顧客と乱数が重ならないように管理される。具体的には、顧客Ａには例えば乱数「４１３２２３」が付され、他の顧客Ｂにはこの乱数と重なることのない乱数、例えば「４３３２１１」が付与される。そして、顧客Ａから錠の注文があると、乱数「４１３２２３」に基づき、回転体の一番目の孔にＮｏ．４のコードピン、２番目の孔にＮｏ．１のコードピン、三番目の孔にＮｏ．３のコードピン、四番目の孔にＮｏ．３のコードピン、五番目の孔にＮｏ．２のコードピン、六番目の孔にＮＯ．３のコードピンを挿入して錠を組み立てる。
【０００６】
このように、従来の鍵変換式ピンタンブラー錠は、顧客毎にコードピンの組み合わせが異なるため、多種少量生産となって生産性が甚だ低く製造コストが高くならざるを得ない。
本発明はかかる問題点に鑑み、多種少量生産でも低コストの鍵変換式ピンタンブラー錠を提供することを目的とする。
【０００７】
【課題を解決するための手段】
前面に丸鍵挿入口を形成したケーシングと、ケーシング内に装着した第１回転体と第２回転体及び固定体とを備え、
第１回転体の前面に、丸鍵が嵌合する鍵嵌合軸を凸設し、該嵌合軸の周囲に軸方向に延びる第１貫通ピン孔の列と、軸方向に延びる少なくとも１個の第２貫通ピン孔を形成し、各第１貫通ピン孔に第１コードピンを挿入し、第２貫通ピン孔に第２コードピンを挿入し、第１回転体の後面に軸方向に延びる延伸部を凸設し、
第２回転体の前面に第１回転体の延伸部が挿入される中心穴を形成し、中心穴の周囲に、第１貫通ピン孔に対応して第３貫通ピン孔の列と、第２貫通ピン孔に対応して第４貫通ピン孔と、第１貫通ピン孔に選択的に対応する第１有底孔の列を形成し、各第３貫通ピン孔に第１中間ピンを挿入し、第４貫通ピン孔に第２中間ピンを挿入し、各第１有底孔に複数個のスペーサーとスペーサーを第１回転体側へ付勢するスプリングを挿入し、第２回転体の後面に錠軸を凸設し、
固定体に錠軸が貫通する中心穴を形成し、中心穴の周囲に第３貫通ピン孔に対応して第２有底孔の列を形成するとともに、第４貫通ピン孔に対応して第３有底孔を形成し、各第２有底孔に第１ドライブピンと第１ドライブピンを第２回転体側へ付勢するスプリングを挿入し、第３有底孔に第２ドライブピンと第２ドライブピンを第２回転体側へ付勢するスプリングを挿入し、
オペレーター用丸鍵を鍵穴に挿入したとき、第２コードピンと対応する第２中間ピンの当接面が第１回転体と第２回転体の境界面から外れて両回転体が一体回転可能に連結されるとともに、第３貫通ピン孔の第１中間ピンと対応する第２有底孔の第１ドライブピンとの当接面及び第４貫通ピン孔の第２中間ピンと第３有底孔の第２ドライブピンとの当接面が第２回転体と固定体との境界面に一致して第２回転体が固定体に対して相対回転可能となり、
変換用丸鍵を鍵穴に挿入したとき、第１コードピンと対応する第１中間ピンとの当接面及び第２コードピンと対応する第２中間ピンとの当接面が第１回転体と第２回転体との境界面に一致して第１回転体が第２回転体に対して相対回転可能となり、かつ第４貫通ピン孔の第２中間ピンと第３有底孔の第１ドライブピンとの当接面が第２回転体と固定体との境界面から外れて第２回転体が固定体に回転不能に連結され、
かつ変換用丸鍵を鍵穴に挿入して所定角度第１回転体を回転すると、第１貫通ピン孔の列が第１有底孔の列に整列して第１有底孔のスペーサーが第１貫通ピン孔中へ移動可能となるように構成したことを特徴とする鍵変換式ピンタンブラー錠。
そして、好ましくは第１貫通ピン孔と第１コードピンの断面形状、第３貫通ピン孔と同貫通ピン孔に挿入される第１中間ピンの断面形状及び第２有底孔と同有底孔に挿入される第１ドライブピンの断面形状及び第１有底孔と同有底孔に挿入されるスペーサーの断面形状を瓢箪形にする。
【０００８】
【発明の作用・効果】
本発明によれば、第１、第２のオペレーター用丸鍵と第１、第２の変換用丸鍵を使うことにより、第１のオペレーター用丸鍵で開閉していた錠を第１のオペレーター用丸鍵では開閉できず、第２のオペレーター用丸鍵でしか開閉できない錠に変換できる。
変換操作は以下の手順で行う。まず、第１の変換用丸鍵を鍵穴に挿入して第１回転体を所定角度回転させ第１貫通ピン孔の列を第１有底孔に整列させる。第１の変換用丸鍵は第２コードピンに対応するカム溝の深さが、第２コードピンと対応する第２中間ピンとの当接面が第１回転体と第２回転体との境界面に一致するように設定されている。また、第１コードピンに対応するカム溝は第１オペレーター用丸鍵の第１コードピンに対応する溝と同じ深さに設定され、これら第１オペレーター用丸鍵の各カム溝は各第１コードピンと第１中間ピンの当接面が第１回転体と第２回転体の境界面に一致するように設定されているので、第１回転体が第２回転体に対して相対回転可能になり、所定角度回転させることができる。
次ぎに、第２変換用丸鍵を鍵穴に挿入する。第２変換用丸鍵の第２コードピンに対応するカム溝は第１変換用丸鍵と同じ深さに設定されている。一方、第２変換用丸鍵の第１コードピンに対応するカム溝は第２オペレーター用丸鍵の第１コードピンに対応するカム溝と同じ深さに設定され、これらのカム溝の深さは顧客に固有の乱数表に基づいて設定されている。そのため、第２変換用丸鍵を鍵穴に挿入すると、第１コードピンに対応するカム溝の深さに応じて所定個数のスペーサーが第２回転体の第１有底孔から第１回転体の第１貫通ピン孔に移動し、第１貫通ピン孔の第１コードピンの長さがスペーサーの分だけ長くなる。従って、第２変換用丸鍵で第１回転体を元の位置に戻すと、錠は第１オペレーター用丸鍵では開閉できなくなる。第２オペレーター用丸鍵の第２コードピンに対応するカム溝は第１オペレーター用丸鍵と同じ深さに設定されているので、錠は第２オペレーター用丸鍵によって開閉できるように変換される。
しかして、本発明の鍵変換式ピンタンブラー錠によれば、所要深さのカム溝を形成した変換用丸鍵を使って錠を従前のオペレーター用丸鍵では開閉できず、別のオペレーター用丸鍵でしか開閉出来ない構造に錠を変換できるので、変換用丸鍵を用意すれば、顧客毎にタンブラーピンを組み込む作業を省略できる。そのため、製造コストを大幅に低減できる。
また、貫通ピン孔を瓢箪形にすることで、第１貫通ピン孔と対応する第３貫通ピン孔又は第１有底孔、及び第３貫通ピン孔と第２有底孔とが正しく整列したときのみ各ピンが対応する孔へ移動可能となり、所定の孔以外の孔へピンやスペーサーが移動して誤作動の原因となることを防止できる。
【０００９】
【発明の実施の形態】
以下に本発明を図面に基づき説明するに、図１には本発明の一実施形態に係る鍵変換式ピンタンブラー錠が示されている。当該ピンタンブラー錠は、ケーシング１０、第１回転体２０、第２回転体３０及び固定体４０を備えている。
【００１０】
ケーシング１０は断面が略８角形の中空構造を有し、前面に丸い鍵穴１１が形成され、鍵穴１１の上下２箇所に、丸鍵の先端外周部に設けられている外向き係合突起が嵌合する矩形の切欠部１２，１３が形成されている。ケーシング１０の上下両面に突条１４が一体に設けられ、上部突条１４に貫通孔１５が形成されている。ケーシング１０の後面にはフランジ１６が一体に設けられ、フランジ１６に取り付けビス用貫通孔１７が形成されている。
【００１１】
第１回転体２０は断面円形の胴部２１を有し、胴部２１前面の中心部に丸鍵が嵌合する鍵嵌合軸２２と同軸２２を囲むスカート部２３が凸設されている。鍵嵌合軸２２の一箇所に丸鍵の先端内周部に設けられた内向き係合突起が係合する係合溝２４が形成されている。胴部２１には、鍵嵌合軸２２の周囲に第１貫通ピン孔２５の列と、１個の第２貫通ピン孔２６が形成されている。これら貫通ピン孔２５，２６は軸方向に延びている。スカート部２３に各ピン孔２５，２６に対応して断面反円形の溝２７が形成されている。第１回転体２０の胴部後面の中心部には軸方向の延伸部２８が一体に凸設され、延伸部２８の上下２箇所に節度機構をなすボール７１とコイルスプリング７２を装着した装着穴２９が形成されている。各第１貫通ピン孔２５には第１コードピン８１が挿入され、第２貫通ピン孔２６には第２コードピン８２が挿入される。
【００１２】
第２回転体３０は断面円形のヘッド部３１を有し、ヘッド部３１の中心に第１回転体２０の延伸部２８が嵌合する第１中心穴３２が形成され、第１中心穴３２の上下２箇所に第１回転体のボールが止まる切欠部３３が形成されている。また、第１中心穴３２の周囲に第１回転体の第１貫通ピン孔２５に対応する第３貫通ピン孔３５の列と、第２貫通ピン孔２６に対応する第４貫通ピン孔３６が形成されている。さらに、第１中心穴３３の周囲には第１回転体２０を第２回転体３０に対して約１８０度回転させたとき、第１回転体２０の第１貫通ピン孔２５に整列する第１有底孔３７の列が形成されている。第２回転体３０の後面には錠軸３８が一体に凸設されている。各第３貫通ピン孔３５には第１中間ピン８３が挿入され、第４貫通ピン孔３６には第２中間ピン８４が挿入される。また、第１有底孔３７にはプッシュピン８５と４個のスペーサー８６及びこれらを第１回転体側へ付勢するコイルスプリング８７が挿入される。スペーサー８６は円盤形を有し、前後両面の外周部が面取り加工されている。
【００１３】
固定体４０は断面円形を有し、中心部に錠軸３８が貫通する第２中心穴４１が形成され、第２中心穴４１の周囲に第３貫通ピン孔３５に対応する第２有底孔４２の列と、第４貫通ピン孔３６に対応する第３有底孔４３が形成されている。また、固定体４０の外周部にケーシングの貫通孔１５に対応する円形凹部４４が形成されている。各第２有底孔４２と第３有底孔４３にはそれぞれ第１ドライブピン８８と第２ドライブピン８９及びこれらを第２回転体側へ付勢するコイルスプリング９０，９１が挿入される。
【００１４】
ケーシング１０、第１回転体２０、第２回転体３０及び固定体４０は図２及び図３に示すように組み付けられる。第１回転体２０と第２回転体３０はケーシング１０に回転可能に装着され、固定体４０はケーシング１０の貫通孔１５を通して円形凹部４４に達するストッパピン７３でケーシング１０に固定される。図２〜図７に示すように、第１回転体２０の鍵嵌合軸２２の係合溝２４とケーシング１０の上側切欠部１２が一致し、ボール７１が第２回転体３０の切欠部３３に当たる位置に第２回転体３０が位置決めされているとき、第１貫通ピン孔２５と第３貫通ピン孔３５及び第２有底孔４２が整列し、第２貫通ピン孔２６と第４貫通ピン孔３６及び第３有底孔４３が整列するので、コイルスプリング９０，９１で付勢され第１ドライブピン８８、第１中間ピン８３、第１コードピン８１が当接し、第２ドライブピン８９第２中間ピン８３、第２コードピン８２が当接する。また、このとき第２回転体３０の第１有底孔３７は第１回転体２０の第１貫通ピン孔２５に整列していないので、スペーサー８６はコイルスプリング８７で付勢されたプッシュピン８５に押され、第１回転体２０の後面に当たっ止まっている。
【００１５】
図８及び図９に、この鍵変換式ピンタンブラー錠に使用する第１、第２オペレーター用丸鍵と第１、第２変換用丸鍵を示す。第１オペレーター用丸鍵５０１の外周部には第１貫通ピン孔２５の列に対応する第１カム溝ａ１，ａ２，ａ３，ａ４，ａ５の列と第２貫通ピン孔２６に対応する第２カム溝ｂ１が形成されている。第１変換用丸鍵６０１には第１カム溝ａ１，ａ２，ａ３，ａ４，ａ５の列と同じ位置に同じ深さのカム溝の列ａ１，ａ２，ａ３，ａ４，ａ５，と、第２カム溝ｂ１と同じ位置にこれより浅い第３カム溝ｂ２が形成されている。第２変換用丸鍵６０２には第１カム溝ａ１，ａ２，ａ３，ａ４，ａ５の列とは異なる第４カム溝ｃ１，ｃ２，ｃ３，ｃ４，ｃ５の列と、第３カム溝ｂ１と同じカム溝が形成されている。第２オペレーター用丸鍵５０２には第４カム溝ｃ１，ｃ２，ｃ３，ｃ４，ｃ５の列と同じカム溝の列と、第２カム溝ｂ２と同じカム溝が形成されている。各丸鍵５０１，５０２，６０１，６０２にはケーシング１０の切欠部１２，１３に対応する外向き係合突起１００と鍵嵌合軸２２の係合溝２４に対応する内向き係合突起１０２が形成されている。
【００１６】
鍵変換式ピンタンブラー錠の構造及びオペレーター用丸鍵と変換用丸鍵の構造は以上の通りであって、次ぎに錠の開閉操作と変換の手順を説明する。図５に示すように、第１オペレーター用丸鍵５０１を鍵穴１１に挿入すると、第１コードピン８１と第１中間ピン８３の当接面が第１回転体２０と第２回転体３０との境界面に一致し、かつ第１中間ピン８３と第１ドライブピン８８の当接面及び第２中間ピン８４と第２ドライブピン８９の当接面が第２回転体３０と固定体４０との境界面に一致するが、第２コードピン８２と第２中間ピン８４の当接面が第１回転体２０と第２回転体３０との境界面から外れる。このため、第１オペレーター用丸鍵５０１を回すと、第１回転体２０と第２回転体３０が一体になって回転し、錠軸３８が回って錠が開閉される。
【００１７】
錠を変換するには、図１０及び図１１に示すように第１変換用丸鍵６０１を鍵穴１１に挿入する。第１変換用丸鍵６０１の挿入により、第１コードピン８１と第１中間ピン８３の当接面が第１回転体２０と第２回転体３０との境界面に一致し、第１中間ピン８３と第１ドライブピン８８の当接面が第２回転体３０と固定体４０との境界面に一致し、かつ第２コードピン８２と第２中間ピン８４の当接面が第１回転体２０と第２回転体３０との境界面に一致するが、第２中間ピン８４と第２ドライブピン８９の当接面が第２回転体３０と固定体４０との境界面から外れる。このため、第２回転体３０は固定体４０と一体になって回転不能となり、第１回転体２０が回転可能となる。
【００１８】
第１変換用丸鍵６０１を鍵穴１１に挿入して時計方向に約１８０度回すと、第１回転体２０が回転し、図１２及び図１３に示すように第１貫通ピン孔２５の列が第１有底孔３７に整列する。そこで、第１変換用丸鍵６０１を鍵穴１１から抜き出し、代わりに第２変換用丸鍵６０２を挿入すると、図１４及び図１５に示すように、第４カム溝ｃ１，ｃ２，ｃ３，ｃ４，ｃ５の深さに応じた数だけのスペーサー８６が第１有底孔３７から第１貫通ピン孔２５へ移動する。また、第２変換用丸鍵６０２は第３カム溝ｂ２を有するので、第２コードピン８２と第２中間ピン８４の当接面が第１回転体２０と第２回転体３０との境界面に一致し、第１回転体２０が回転可能になる。そこで、第２変換用丸鍵６０２を反時計方向に約１８０度回してから抜き取る。これにより、各第１貫通ピン孔２５の第１コードピン８１は移動してきたスペーサー８６の分だけ長くなるので、もはや第１オペレーター用丸鍵５０１を挿入しても開閉できなくなる。しかし、第２オペレーター用丸鍵５０２は第２変換用丸鍵６０２と同じ第４カム溝ｃ１，ｃ２，ｃ３，ｃ４，ｃ５の列と、第１オペレーター用丸鍵５０１と同じ第２カム溝ｂ１を有するので、第２オペレーター用丸鍵５０２を挿入すれば、図１６及び図１７に示すように、第１中間ピン８３と第１ドライブピン８８の当接面及び第２中間ピン８４と第２ドライブピン８９の当接面が第２回転体３０と固定体４０との境界面に一致して第２回転体３０が回転可能となり、かつ第２コードピン８２と第２中間ピン８４の当接面が第１回転体２０と第２回転体３０との境界面から外れて両回転体２０，３０が一体になる。従って、第２オペレーター用丸鍵５０２を回すと、第２回転体３０が第１回転体２０と一体に回転して錠軸３８が回り、錠が開閉される。
【００１９】
以上説明したように、本実施形態に係る鍵変換式ピンタンブラー錠によれば、所要深さのカム溝を形成した変換用丸鍵６０１，６０２を使って錠を従前のオペレーター用丸鍵５０１では開閉できず、別のオペレーター用丸鍵５０２でしか開閉出来ない構造に錠を変換できるので、顧客毎にタンブラーピンを組み込む作業を省略できる。そのため、製造コストを大幅に低減できる。
【００２０】
次ぎに、本発明の他の実施形態に係る鍵変換式ピンタンブラー錠を図１８に示す。当該ピンタンブラー錠における第１コードピン８１Ａ、第１中間ピン８３Ａ、第１ドライブピン８８Ａ、プッシュピン８５Ａは図１９に拡大して図示するように、断面形状が瓢箪形になるように、断面円形のピンに半円形の溝ｇを対称位置に形成し、端面に面取りｈ加工を施している。また、スペーサー８６Ａは断面瓢箪形のピンを薄く切断した瓢箪形の盤を用いている。これら瓢箪形のピンやスペーサーが挿入される第１貫通ピン孔２５Ａ、第３貫通ピン孔３５Ａ、第１有底孔３７Ａ、第２有底孔４２Ａの断面形状もピンやスペーサーが移動可能に嵌合するように瓢箪形に形成されている。また、第１貫通ピン孔に連通する溝２７Ａも半瓢箪形の断面形状に形成されている。
なお、本実施形態に係る鍵変換式ピンタンブラー錠の他の構成並びに錠の開閉操作、錠の変換操作は前述した鍵変換式ピンタンブラー錠と同じであるので、同一の構成部材には同一の符号を付して詳細な説明は省略する。
【００２１】
本実施形態に係る鍵変換式ピンタンブラー錠は、ピン及び孔を瓢箪形にしたので、第１貫通ピン孔２５Ａと対応する第３貫通ピン孔３５Ａ又は第１有底孔３７Ａ、及び第３貫通ピン孔３５Ａと第２有底孔と４２Ａが正しく整列したときのみ各ピンが対応する孔へ移動可能となり、断面円形のピンや貫通ピン孔、有底孔を備えたピンタンブラー錠の場合に往々にして生じる、所定の孔以外の孔へピンやスペーサーが移動することによる誤作動を防止できる。
【図面の簡単な説明】
【図１】本発明の一実施形態に係る鍵変換式ピンタンブラー錠を示す分解斜視図である。
【図２】鍵変換式ピンタンブラー錠の正面透視図である。
【図３】図２の３−３線から切断した断面図である。
【図４】鍵変換式ピンタンブラー錠の正面透視図である。
【図５】第１オペレーター用丸鍵を挿入したときの図４の５−５線から切断した断面図である。
【図６】鍵変換式ピンタンブラー錠の正面透視図である。
【図７】第１オペレーター用丸鍵を挿入したときの図６の７−７線から切断した部分断面図である。
【図８】２種類のオペレーター用丸鍵を示す斜視図である。
【図９】２種類の変換用丸鍵を示す斜視図である。
【図１０】鍵変換式ピンタンブラー錠の正面透視図である。
【図１１】第１変換用丸鍵を挿入したときの図１０の１１−１１線から切断した断面図である。
【図１２】第１変換用丸鍵を挿入して１８０度回したときの鍵変換式ピンタンブラー錠の正面透視図である。
【図１３】第１変換用丸鍵を挿入したときの図１２の１３−１３線から切断した断面図である。
【図１４】第１変換用丸鍵を挿入して１８０度回したときの鍵変換式ピンタンブラー錠の正面透視図である。
【図１５】第１変換用丸鍵を挿入したときの図１４の１５−１５線から切断した断面図である。
【図１６】鍵変換式ピンタンブラー錠の正面透視図である。
【図１７】第２オペレーター用丸鍵を挿入したときの図１６の１７−１７線から切断した部分断面図である。
【図１８】本発明の他の実施形態に係る鍵変換式ピンタンブラー錠を示す分解斜視図である。
【図１９】同ピンタンブラー錠のピンを示す斜視図である。
【符号の説明】
１０…ケーシング、１１…鍵穴、２０…第１回転体、２２…鍵嵌合軸、２５…第１貫通ピン孔、２６…第２貫通ピン孔、２５…延伸部、３０…第２回転体、３５…第３貫通ピン孔、３６…第４貫通ピン孔、３７…第１有底孔、３８…錠軸、４０…固定体、４２…第２有底孔、４３…第３有底孔、８１，８１Ａ…第１コードピン、８２…第２コードピン、８３，８３Ａ…第１中間ピン、８４…第２中間ピン、８５，８５Ａ…プッシュピン、８６，８６Ａ…スペーサー、８８，８８Ａ…第１ドライブピン、８９…第２ドライブピン、８７，９０…コイルスプリング。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a key conversion type pin tumbler lock.
[0002]
[Prior art]
In the hall where pachinko machines and slot machines are installed, each employee has a common key, and this key is used to open and close the pin tumbler lock attached to the window frame of the pachinko machine and the like. In such a pin tumbler lock, if one of the common keys is lost, all the locks such as pachinko machines in the store must be replaced in order to prevent abuse of the key, but this requires a large cost. Therefore, when a common key is lost in a pin tumbler lock such as a pachinko machine, the arrangement of the tumbler pins inside the lock is converted using a conversion key, thereby making it impossible to open and close the lock with the lost key anymore, A key conversion type pin tumbler lock that can be opened and closed only by another key is widely used.
[0003]
As one type of this type of key conversion type pin tumbler lock, Japanese Patent Laid-Open Publication No. Hei 8-284500 discloses a case in which a casing, a fixed body, and a rotating body are provided. , A lock pin is protruded from the rotating body, a row of through-pin holes is formed around the lock shaft, the fixed body is fixed in the casing and the rotating body is mounted, and the lock shaft is fixed to the center of the fixed body. Insert it into the through hole and project it out of the casing, insert the spring and drive pin into the bottomed pin hole of the fixed body, insert the code pin into the through pin hole of the rotating body, and insert it into the tip of one drive pin. A pin tumbler lock in which a small diameter portion is formed so as to be breakable from that portion is disclosed.
[0004]
In this key conversion type pin tumbler lock, the first conversion round key having the same cam groove as the original operator round key is inserted into the keyhole of the casing and rotated by a predetermined angle. Then, when the second round key for conversion is inserted and rotated to the original position, the tip of one drive pin is broken and the broken part moves to one of the through-pin holes of the rotating body. The apparent length of the code pin in the through-pin hole becomes longer by the dimension of the broken portion. Therefore, the original operator round key becomes unusable, and another operator round key having the same cam groove as the second conversion round key becomes usable.
[0005]
[Problems to be solved by the invention]
By the way, in a conventional key conversion type pin tumbler lock used in a pachinko machine or a slot machine, for example, six through-pin holes are formed in a rotating body, and no. 1 to No. Four types of code pins having four different lengths are prepared, and one code pin selected from four types is inserted into each through-pin hole based on a six-digit random number and assembled. Then, a random number is designated for each customer, and management is performed so that the random numbers do not overlap with other customers. Specifically, a random number “413223” is assigned to the customer A, for example, and a random number that does not overlap with the random number, for example, “4333211” is assigned to the other customers B. Then, when the customer A places an order for a lock, the No. is placed in the first hole of the rotating body based on the random number “413223”. No. 4 cord pin and No. 4 in the second hole. No. 1 code pin, No. 3 in the third hole. No. 3 code pin, No. 4 in the fourth hole. No. 3 code pin, No. 5 in the fifth hole No. 2 code pin, NO. Insert the code pin No. 3 to assemble the lock.
[0006]
As described above, in the conventional key conversion type pin tumbler lock, since the combination of the code pins is different for each customer, it is necessary to produce various kinds in small quantities, resulting in extremely low productivity and high manufacturing cost.
The present invention has been made in view of the above problems, and has as its object to provide a key conversion type pin tumbler lock which can be produced at a low cost even in various small-lot production.
[0007]
[Means for Solving the Problems]
A casing having a round key insertion opening on the front surface, a first rotating body, a second rotating body, and a fixed body mounted in the casing;
On the front surface of the first rotating body, a key fitting shaft into which a round key is fitted is protruded, and a row of first through pin holes extending in the axial direction around the fitting shaft, and at least one extending in the axial direction. Are formed, a first code pin is inserted into each first through-pin hole, a second code pin is inserted into the second through-pin hole, and extends axially to the rear surface of the first rotating body. The extension part is protruded,
A center hole into which the extension of the first rotating body is inserted is formed on the front surface of the second rotating body, and a row of third through-pin holes corresponding to the first through-pin holes is formed around the center hole, A row of fourth through-pin holes corresponding to the through-pin holes and a row of first bottomed holes selectively corresponding to the first through-pin holes are formed, and a first intermediate pin is inserted into each of the third through-pin holes. A second intermediate pin is inserted into the fourth through-hole, a plurality of spacers and a spring for urging the spacers toward the first rotating body are inserted into the first bottomed holes, and a lock is inserted into the rear surface of the second rotating body. Protruding shaft,
A center hole through which the lock pin penetrates is formed in the fixed body, a second row of bottomed holes is formed around the center hole corresponding to the third through pin hole, and a second bottomed hole is formed corresponding to the fourth through pin hole. Three bottomed holes are formed, and a first drive pin and a spring for urging the first drive pin toward the second rotating body are inserted into each second bottomed hole, and a second drive pin and a second drive are inserted into the third bottomed hole. Insert a spring that biases the pin toward the second rotating body,
When the operator's round key is inserted into the keyhole, the contact surface of the second intermediate pin corresponding to the second code pin is disengaged from the boundary surface between the first and second rotating members, and the two rotating members are integrally rotatably connected. And a contact surface of the second bottomed hole corresponding to the first intermediate pin of the third through-pin hole with the first drive pin, and a second drive of the second intermediate pin and the third bottomed hole of the fourth through-pin hole. The contact surface with the pin coincides with the boundary surface between the second rotating body and the fixed body, so that the second rotating body can rotate relative to the fixed body,
When the round key for conversion is inserted into the keyhole, the contact surface between the first code pin and the corresponding first intermediate pin and the contact surface between the second code pin and the corresponding second intermediate pin are the first rotating body and the second rotating body. The first rotating body is rotatable relative to the second rotating body in accordance with the boundary surface between the first rotating body and the second rotating body, and the contact surface between the second intermediate pin of the fourth through pin hole and the first drive pin of the third bottomed hole. Deviates from the boundary surface between the second rotating body and the fixed body, and the second rotating body is non-rotatably connected to the fixed body,
When the first rotary body is rotated at a predetermined angle by inserting the round key for conversion into the keyhole, the row of the first through-pin holes is aligned with the row of the first bottomed holes, and the spacer of the first bottomed hole is in the first position. A key conversion type pin tumbler lock characterized by being configured to be movable into a through pin hole.
Preferably, the cross-sectional shape of the first through-pin hole and the first code pin, the cross-sectional shape of the first intermediate pin inserted into the third through-pin hole and the same through-hole, and the second bottomed hole and the same bottomed hole The cross-sectional shape of the first drive pin inserted into the hole and the cross-sectional shape of the first bottomed hole and the spacer inserted into the same bottomed hole are made gourd-shaped.
[0008]
[Action and Effect of the Invention]
According to the present invention, by using the first and second round keys for operator and the first and second round keys for conversion, the lock opened and closed by the first round key for operator can be changed to the first operator. The lock cannot be opened and closed with the round key for the operator, but can be opened and closed only with the round key for the second operator.
The conversion operation is performed in the following procedure. First, the first conversion round key is inserted into the keyhole, the first rotating body is rotated by a predetermined angle, and the row of first through-pin holes is aligned with the first bottomed hole. The first conversion round key has a cam groove depth corresponding to the second code pin, and a contact surface between the second code pin and the corresponding second intermediate pin has a boundary surface between the first rotating body and the second rotating body. Is set to match. The cam groove corresponding to the first code pin is set to the same depth as the groove corresponding to the first code pin of the first operator round key. Since the contact surface between the code pin and the first intermediate pin is set so as to coincide with the boundary surface between the first rotating body and the second rotating body, the first rotating body can be relatively rotated with respect to the second rotating body. That is, it can be rotated by a predetermined angle.
Next, the second round key for conversion is inserted into the keyhole. The cam groove corresponding to the second code pin of the second conversion round key is set to the same depth as the first conversion round key. On the other hand, the cam groove corresponding to the first code pin of the second conversion round key is set to the same depth as the cam groove corresponding to the first code pin of the second operator round key. Is set based on a random number table unique to the customer. Therefore, when the second round key for conversion is inserted into the keyhole, a predetermined number of spacers are moved from the first bottomed hole of the second rotating body to the first rotating body according to the depth of the cam groove corresponding to the first code pin. Moving to the first through-pin hole, the length of the first code pin in the first through-pin hole is increased by the amount of the spacer. Therefore, when the first rotary body is returned to the original position by the second conversion round key, the lock cannot be opened and closed by the first operator round key. Since the cam groove corresponding to the second code pin of the second operator round key is set to the same depth as the first operator round key, the lock is converted so that it can be opened and closed by the second operator round key. .
However, according to the key conversion type pin tumbler lock of the present invention, the lock cannot be opened and closed by the conventional operator's round key using the conversion round key formed with the cam groove of the required depth, and another operator's circle is not used. Since a lock can be converted into a structure that can be opened and closed only by a key, the work of installing a tumbler pin for each customer can be omitted by preparing a round key for conversion. Therefore, the manufacturing cost can be significantly reduced.
Further, by forming the through-pin holes in a gourd shape, the third through-pin holes or the first bottomed holes corresponding to the first through-pin holes, and the third through-pin holes and the second bottomed holes are correctly aligned. Only when is it possible for each pin to move to the corresponding hole, it can be prevented that the pin or the spacer moves to a hole other than the predetermined hole and causes a malfunction.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
DETAILED DESCRIPTION OF THE INVENTION Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 shows a key conversion type pin tumbler lock according to an embodiment of the present invention. The pin tumbler lock includes a casing 10, a first rotating body 20, a second rotating body 30, and a fixed body 40.
[0010]
The casing 10 has a hollow structure having a substantially octagonal cross section, a round keyhole 11 formed on the front surface, and outwardly engaging projections provided on the outer periphery of the tip of the round key are fitted at two locations above and below the keyhole 11. Rectangular notches 12 and 13 are formed. Protrusions 14 are integrally provided on both upper and lower surfaces of the casing 10, and a through hole 15 is formed in the upper protrusion 14. A flange 16 is integrally provided on the rear surface of the casing 10, and a through hole 17 for a mounting screw is formed in the flange 16.
[0011]
The first rotating body 20 has a body portion 21 having a circular cross section, and a skirt portion 23 surrounding a coaxial 22 and a key fitting shaft 22 into which a round key is fitted is protruded at the center of the front surface of the body portion 21. An engagement groove 24 is formed at one position of the key fitting shaft 22 so that an inward engagement projection provided on the inner periphery of the tip of the round key engages. A row of first through-pin holes 25 and one second through-pin hole 26 are formed in the body 21 around the key fitting shaft 22. These through pin holes 25 and 26 extend in the axial direction. A groove 27 having an anti-circular cross section is formed in the skirt portion 23 corresponding to each of the pin holes 25 and 26. An axially extending portion 28 is integrally formed at the center of the rear surface of the body of the first rotating body 20, and a mounting hole in which a ball 71 and a coil spring 72 forming a moderation mechanism are mounted at two positions above and below the extending portion 28. 29 are formed. A first code pin 81 is inserted into each first through-pin hole 25, and a second code pin 82 is inserted into each second through-pin hole 26.
[0012]
The second rotating body 30 has a head portion 31 having a circular cross section, and a first center hole 32 in which the extension portion 28 of the first rotating body 20 is fitted is formed at the center of the head portion 31. Notch portions 33 where the ball of the first rotating body stops are formed at two upper and lower positions. A row of third through-holes 35 corresponding to the first through-hole 25 of the first rotating body and a fourth through-hole 36 corresponding to the second through-hole 26 are provided around the first center hole 32. Is formed. Further, when the first rotating body 20 is rotated about 180 degrees with respect to the second rotating body 30 around the first center hole 33, the first rotating body 20 is aligned with the first through-pin hole 25 of the first rotating body 20. A row of bottomed holes 37 is formed. A lock shaft 38 is integrally formed on the rear surface of the second rotating body 30 so as to protrude therefrom. A first intermediate pin 83 is inserted into each of the third through-pin holes 35, and a second intermediate pin 84 is inserted into the fourth through-pin holes 36. In the first bottomed hole 37, a push pin 85, four spacers 86, and a coil spring 87 for urging them toward the first rotating body are inserted. The spacer 86 has a disk shape, and the outer peripheral portions of both front and rear surfaces are chamfered.
[0013]
The fixed body 40 has a circular cross section, a second central hole 41 through which the lock shaft 38 penetrates is formed at the center, and a second bottomed hole corresponding to the third through-pin hole 35 around the second central hole 41. 42, and third bottomed holes 43 corresponding to the fourth through-pin holes 36 are formed. Further, a circular concave portion 44 corresponding to the through hole 15 of the casing is formed on the outer peripheral portion of the fixed body 40. A first drive pin 88, a second drive pin 89, and coil springs 90, 91 for urging the first drive pin 88 and the second drive pin 89 toward the second rotating body are inserted into the second bottomed hole 42 and the third bottomed hole 43, respectively.
[0014]
The casing 10, the first rotating body 20, the second rotating body 30, and the fixed body 40 are assembled as shown in FIGS. The first rotating body 20 and the second rotating body 30 are rotatably mounted on the casing 10, and the fixed body 40 is fixed to the casing 10 by stopper pins 73 that reach the circular recesses 44 through the through holes 15 of the casing 10. As shown in FIGS. 2 to 7, the engaging groove 24 of the key fitting shaft 22 of the first rotating body 20 matches the upper cutout 12 of the casing 10, and the ball 71 is inserted into the cutout 33 of the second rotating body 30. When the second rotating body 30 is positioned at the position corresponding to the first through-pin hole 25, the third through-pin hole 35, and the second bottomed hole 42 are aligned, and the second through-pin hole 26 and the fourth through-pin are aligned. Since the hole 36 and the third bottomed hole 43 are aligned, the first drive pin 88, the first intermediate pin 83, and the first cord pin 81 are urged by the coil springs 90, 91 to contact the second drive pin 89. The second intermediate pin 83 and the second cord pin 82 are in contact. At this time, since the first bottomed hole 37 of the second rotating body 30 is not aligned with the first through-pin hole 25 of the first rotating body 20, the spacer 86 pushes the push pin 85 urged by the coil spring 87. , And hits the rear surface of the first rotating body 20.
[0015]
8 and 9 show first and second operator round keys and first and second conversion round keys used for the key conversion type pin tumbler lock. On the outer peripheral portion of the first operator round key 501, the first cam grooves a1, a2, a3, a4, a5 corresponding to the row of the first through pin holes 25 and the second cam grooves a1, a2, a3, a4, a5 corresponding to the second through pin holes 26. A cam groove b1 is formed. The first conversion round key 601 has a row of cam grooves a1, a2, a3, a4, a5 of the same depth at the same position as the row of the first cam grooves a1, a2, a3, a4, a5, and a second A third cam groove b2 shallower than this is formed at the same position as the cam groove b1. The second conversion round key 602 includes a row of fourth cam grooves c1, c2, c3, c4, and c5 different from the row of first cam grooves a1, a2, a3, a4, and a5, and a third cam groove b1. The same cam groove is formed. The second operator round key 502 has the same row of cam grooves as the rows of the fourth cam grooves c1, c2, c3, c4, and c5, and the same cam groove as the second cam groove b2. Each round key 501, 502, 601, 602 has an outward engaging projection 100 corresponding to the notch 12, 13 of the casing 10 and an inward engaging projection 102 corresponding to the engaging groove 24 of the key fitting shaft 22. Is formed.
[0016]
The structure of the key conversion type pin tumbler lock and the structure of the operator's round key and the conversion round key are as described above. Next, the procedure for opening and closing the lock and the conversion will be described. As shown in FIG. 5, when the first operator round key 501 is inserted into the keyhole 11, the contact surface between the first cord pin 81 and the first intermediate pin 83 causes the first rotating body 20 and the second rotating body 30 to contact each other. The contact surface between the first intermediate pin 83 and the first drive pin 88 and the contact surface between the second intermediate pin 84 and the second drive pin 89 coincide with the boundary surface. Although the contact surface coincides with the boundary surface, the contact surface between the second cord pin 82 and the second intermediate pin 84 deviates from the boundary surface between the first rotating body 20 and the second rotating body 30. For this reason, when the first operator round key 501 is turned, the first rotating body 20 and the second rotating body 30 rotate integrally, and the lock shaft 38 is turned to open and close the lock.
[0017]
To convert the lock, the first conversion round key 601 is inserted into the keyhole 11 as shown in FIGS. By inserting the first conversion round key 601, the contact surface between the first cord pin 81 and the first intermediate pin 83 coincides with the boundary surface between the first rotating body 20 and the second rotating body 30, and the first intermediate pin The contact surface between the first drive pin 88 and the first drive pin 88 coincides with the boundary surface between the second rotating body 30 and the fixed body 40, and the contact surface between the second cord pin 82 and the second intermediate pin 84 is the first rotating body. The contact surface between the second intermediate pin 84 and the second drive pin 89 is displaced from the interface between the second rotating body 30 and the fixed body 40, although it coincides with the interface between the second rotating body 30 and the fixed body 40. For this reason, the second rotating body 30 cannot rotate together with the fixed body 40, and the first rotating body 20 can rotate.
[0018]
When the first conversion round key 601 is inserted into the keyhole 11 and turned clockwise by about 180 degrees, the first rotating body 20 rotates, and as shown in FIGS. It is aligned with the first bottomed hole 37. Then, when the first conversion round key 601 is extracted from the keyhole 11 and the second conversion round key 602 is inserted instead, as shown in FIGS. 14 and 15, the fourth cam grooves c1, c2, c3, c4, As many spacers 86 as the number corresponding to the depth of c5 move from the first bottomed hole 37 to the first through-pin hole 25. Further, since the second conversion round key 602 has the third cam groove b2, the contact surface between the second cord pin 82 and the second intermediate pin 84 is a boundary surface between the first rotating body 20 and the second rotating body 30. And the first rotating body 20 becomes rotatable. Then, the second conversion round key 602 is turned counterclockwise by about 180 degrees and then removed. As a result, the first code pin 81 of each first through-pin hole 25 becomes longer by the distance of the spacer 86 that has been moved, so that it is no longer possible to open and close even if the first operator round key 501 is inserted. However, the second operator round key 502 has the same row of fourth cam grooves c1, c2, c3, c4, and c5 as the second conversion round key 602, and the same second cam groove b1 as the first operator round key 501. Therefore, if the second operator round key 502 is inserted, as shown in FIGS. 16 and 17, the contact surface between the first intermediate pin 83 and the first drive pin 88 and the second intermediate pin 84 and the second The contact surface of the drive pin 89 coincides with the boundary surface between the second rotating body 30 and the fixed body 40 so that the second rotating body 30 can rotate, and the second cord pin 82 and the second intermediate pin 84 abut on each other. The surface is deviated from the boundary between the first rotating body 20 and the second rotating body 30, and the two rotating bodies 20, 30 are integrated. Therefore, when the second operator round key 502 is turned, the second rotating body 30 rotates integrally with the first rotating body 20, the lock shaft 38 rotates, and the lock is opened and closed.
[0019]
As described above, according to the key conversion type pin tumbler lock according to the present embodiment, the lock is formed by using the conversion round keys 601 and 602 formed with the cam grooves of the required depth in the conventional operator round key 501. Since the lock can be converted into a structure that cannot be opened and closed and can be opened and closed only by another operator's round key 502, the work of installing a tumbler pin for each customer can be omitted. Therefore, the manufacturing cost can be significantly reduced.
[0020]
Next, a key conversion type pin tumbler lock according to another embodiment of the present invention is shown in FIG. The first cord pin 81A, the first intermediate pin 83A, the first drive pin 88A, and the push pin 85A in the pin tumbler lock have a circular cross-section so that the cross-sectional shape becomes a gourd-shaped as shown in FIG. A semi-circular groove g is formed at a symmetrical position on the pin, and the end face is chamfered. The spacer 86A is a gourd-shaped board in which a gourd-shaped pin is cut thin. The cross-sectional shapes of the first through-pin hole 25A, the third through-pin hole 35A, the first bottomed hole 37A, and the second bottomed hole 42A into which the gourd-shaped pins and spacers are inserted are movably fitted with the pins and spacers. It is shaped like a gourd so that it fits together. The groove 27A communicating with the first through-pin hole is also formed in a semi-gourd-shaped cross section.
Note that the other configuration of the key conversion type pin tumbler lock according to the present embodiment, the opening and closing operation of the lock, and the conversion operation of the lock are the same as those of the above-described key conversion type pin tumbler lock. Reference numerals are used and detailed description is omitted.
[0021]
In the key conversion type pin tumbler lock according to the present embodiment, since the pins and the holes are formed in a gourd shape, the third through-hole 35A or the first bottomed hole 37A corresponding to the first through-hole 25A and the third through-hole. Only when the pin hole 35A, the second bottomed hole and 42A are correctly aligned, each pin can move to the corresponding hole, and often in the case of a pin tumbler lock having a circular cross-section pin, a through pin hole, and a bottomed hole. This can prevent malfunction caused by the movement of the pin or the spacer to a hole other than the predetermined hole.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a key conversion type pin tumbler lock according to an embodiment of the present invention.
FIG. 2 is a front perspective view of a key conversion type pin tumbler lock.
FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;
FIG. 4 is a front perspective view of a key conversion type pin tumbler lock.
5 is a sectional view taken along line 5-5 in FIG. 4 when a first operator round key is inserted.
FIG. 6 is a front perspective view of a key conversion type pin tumbler lock.
FIG. 7 is a partial sectional view taken along line 7-7 in FIG. 6 when a first operator round key is inserted.
FIG. 8 is a perspective view showing two types of operator round keys.
FIG. 9 is a perspective view showing two types of round keys for conversion.
FIG. 10 is a front perspective view of a key conversion type pin tumbler lock.
FIG. 11 is a cross-sectional view taken along line 11-11 of FIG. 10 when a first conversion round key is inserted.
FIG. 12 is a front perspective view of the key conversion type pin tumbler lock when the first conversion round key is inserted and turned 180 degrees.
FIG. 13 is a cross-sectional view taken along line 13-13 of FIG. 12 when a first conversion round key is inserted.
FIG. 14 is a front perspective view of the key conversion type pin tumbler lock when the first conversion round key is inserted and turned 180 degrees.
FIG. 15 is a cross-sectional view taken along line 15-15 of FIG. 14 when a first conversion round key is inserted.
FIG. 16 is a front perspective view of a key conversion type pin tumbler lock.
FIG. 17 is a partial cross-sectional view taken along line 17-17 of FIG. 16 when a second operator round key is inserted.
FIG. 18 is an exploded perspective view showing a key conversion type pin tumbler lock according to another embodiment of the present invention.
FIG. 19 is a perspective view showing a pin of the pin tumbler lock.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Casing, 11 ... Keyhole, 20 ... 1st rotating body, 22 ... Key fitting shaft, 25 ... 1st penetration pin hole, 26 ... 2nd penetration pin hole, 25 ... Extension part, 30 ... 2nd rotating body, 35: third through-pin hole, 36: fourth through-pin hole, 37: first bottomed hole, 38: lock shaft, 40: fixed body, 42: second bottomed hole, 43: third bottomed hole, 81, 81A: first code pin, 82: second code pin, 83, 83A: first intermediate pin, 84: second intermediate pin, 85, 85A: push pin, 86, 86A: spacer, 88, 88A: first 1 drive pin, 89 ... second drive pin, 87, 90 ... coil spring.

Claims

A casing having a round key insertion opening on the front surface, a first rotating body, a second rotating body, and a fixed body mounted in the casing;
On the front surface of the first rotating body, a key fitting shaft into which a round key is fitted is protruded, and a row of first through pin holes extending in the axial direction around the fitting shaft, and at least one extending in the axial direction. Are formed, a first code pin is inserted into each first through-pin hole, a second code pin is inserted into the second through-pin hole, and extends axially to the rear surface of the first rotating body. The extension part is protruded,
A center hole into which the extension of the first rotating body is inserted is formed on the front surface of the second rotating body, and a row of third through-pin holes corresponding to the first through-pin holes is formed around the center hole, A row of fourth through-pin holes corresponding to the through-pin holes and a row of first bottomed holes selectively corresponding to the first through-pin holes are formed, and a first intermediate pin is inserted into each of the third through-pin holes. A second intermediate pin is inserted into the fourth through-hole, a plurality of spacers and a spring for urging the spacers toward the first rotating body are inserted into the first bottomed holes, and a lock is inserted into the rear surface of the second rotating body. Protruding shaft,
A center hole through which the lock pin penetrates is formed in the fixed body, a second row of bottomed holes is formed around the center hole corresponding to the third through pin hole, and a second bottomed hole is formed corresponding to the fourth through pin hole. Three bottomed holes are formed, and a first drive pin and a spring for urging the first drive pin toward the second rotating body are inserted into each second bottomed hole, and a second drive pin and a second drive are inserted into the third bottomed hole. Insert a spring that biases the pin toward the second rotating body,
When the operator's round key is inserted into the keyhole, the contact surface of the second intermediate pin corresponding to the second code pin is disengaged from the boundary surface between the first and second rotating members, and the two rotating members are integrally rotatably connected. And a contact surface of the second bottomed hole corresponding to the first intermediate pin of the third through-pin hole with the first drive pin, and a second drive of the second intermediate pin and the third bottomed hole of the fourth through-pin hole. The contact surface with the pin coincides with the boundary surface between the second rotating body and the fixed body, so that the second rotating body can rotate relative to the fixed body,
When the round key for conversion is inserted into the keyhole, the contact surface between the first code pin and the corresponding first intermediate pin and the contact surface between the second code pin and the corresponding second intermediate pin are the first rotating body and the second rotating body. The first rotating body is rotatable relative to the second rotating body in accordance with the boundary surface between the first rotating body and the second rotating body, and the contact surface between the second intermediate pin of the fourth through pin hole and the first drive pin of the third bottomed hole. Deviates from the boundary surface between the second rotating body and the fixed body, and the second rotating body is non-rotatably connected to the fixed body,
When the first rotary body is rotated at a predetermined angle by inserting the round key for conversion into the keyhole, the row of the first through-pin holes is aligned with the row of the first bottomed holes, and the spacer of the first bottomed hole is in the first position. A key conversion type pin tumbler lock characterized by being configured to be movable into a through pin hole.

The cross-sectional shape of the first through-pin hole and the first cord pin, the cross-sectional shape of the third through-pin hole and the first intermediate pin inserted into the same through-pin hole, and the second through-hole and the second bottomed hole are inserted into the same bottomed hole. 2. The key conversion type pin tumbler lock according to claim 1, wherein the cross-sectional shape of the first drive pin and the cross-sectional shape of the first bottomed hole and the spacer inserted into the bottomed hole are gourd-shaped.