JPS63289180A - Block plate of key cylinder for car - Google Patents
Block plate of key cylinder for carInfo
- Publication number
- JPS63289180A JPS63289180A JP62126829A JP12682987A JPS63289180A JP S63289180 A JPS63289180 A JP S63289180A JP 62126829 A JP62126829 A JP 62126829A JP 12682987 A JP12682987 A JP 12682987A JP S63289180 A JPS63289180 A JP S63289180A
- Authority
- JP
- Japan
- Prior art keywords
- hardness
- key cylinder
- block plate
- hole
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000463 material Substances 0.000 claims description 37
- 238000000034 method Methods 0.000 description 13
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- 238000010438 heat treatment Methods 0.000 description 9
- 239000000047 product Substances 0.000 description 7
- 238000011282 treatment Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000004080 punching Methods 0.000 description 5
- 238000012937 correction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000009466 transformation Effects 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 229910001563 bainite Inorganic materials 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 229910001361 White metal Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 210000003734 kidney Anatomy 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- 239000010969 white metal Substances 0.000 description 1
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
技術分野
本発明は、自動車用キーシリンダーに関し、詳しくは、
自動車のキーシリンダーに装着されているブロック板に
関する。DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a key cylinder for an automobile, and more specifically, to a key cylinder for an automobile.
It relates to a block plate attached to an automobile key cylinder.
従来技術
従来、自動車のキーシリンダーにおいては、該キーシリ
ンダーの破壊を防止するため、シリンダー内最外側端部
に同一のキー穴を備えたブロック板が備えられている。BACKGROUND ART Conventionally, in order to prevent the key cylinder from being destroyed, a block plate having the same key hole is provided at the outermost end of the cylinder in order to prevent the key cylinder from being destroyed.
該ブロック板は、外部より上記キーシリンダーを解錠さ
せるべく、キー穴にドリル等を差し込みシリンダー内部
に収納されたロータ部を抜き取ってキーシリンダーを破
壊することを防止するためのらのである。The block plate is for preventing the key cylinder from being destroyed by inserting a drill or the like into the key hole and pulling out the rotor portion housed inside the cylinder in order to unlock the key cylinder from the outside.
従って、このブロック板には、硬度が高くかつ堅牢な材
質が要求される。Therefore, this block plate is required to be made of a material with high hardness and robustness.
すなわち、上記ブロック板は、高い硬度が要求され、該
要求を達成するために、従来より、上記ブロック板に十
分な硬度を与えるための種々の処理が施こされ、かつ、
材料選定された素材により形成されている。ここに、従
来よりの代表的な例をいくつか列記すると、
（例Ｉ）素材か軟＊（低炭素鋼）で、その表面をチッ化
処理されたもの。That is, the block plate is required to have high hardness, and in order to achieve this requirement, various treatments have been conventionally performed to give the block plate sufficient hardness, and
Made of selected materials. Here are some typical examples from the past: (Example I) A material made of soft* (low carbon steel) whose surface has been treated with nitride.
（例■）素材が硬Ｈ（高炭素鋼）で焼入・焼戻しされた
もの。(Example ■) The material is hardened and tempered with hard H (high carbon steel).
（例■）素材が硬鋼で浸炭焼入れ又は浸炭チッ化処理さ
れたもの。(Example ■) The material is hard steel that has been carburized and quenched or carburized and nitrided.
（例■）焼結鋼を素材に用いたもの。(Example ■) Items made of sintered steel.
等の如くである。これらは、全て、上記ブロック板に要
求される高硬度を達成するための各種技法が適用されて
いる。第４図に上記６例に係る硬度−表面距離線図を示
す。etc. Various techniques have been applied to all of these to achieve the high hardness required for the block plate. FIG. 4 shows a hardness-surface distance diagram according to the above six examples.
ところが、上記６例は、素材の硬化処理に起因する種々
の問題をはらんでいる。すなわち、例■では、素材自体
に何ら熱処理が施こされず、素材の表面のみがチッ化処
理されるので、硬度は、表面のごく浅い部分については
、多少高くなるが、深くなるにつれ、素材固有の硬度に
もどる。例■では、硬度上の要求事項は、十分溝されて
いるが、熱処理に伴う歪の矯正が必要であり、矯正後に
おいては、寸法精度の不安定が残る。さらに焼入れによ
る素材表面の脱炭が生じやすく、耐摩耗性が低下するこ
とかある。例■では、硬度的に十分満足しうるものの、
硬化処理を行うためのコストが高くつく。例■では、焼
結に用いる粉末材料を厳選することにより所定の硬度を
達成するようにしているが、焼結法は、組織内に空孔が
発生するという特有の問題が生じやすい。However, the above six examples have various problems caused by the hardening process of the materials. In other words, in Example 2, no heat treatment is applied to the material itself, and only the surface of the material is nitrided, so the hardness is somewhat higher at the shallowest portions of the surface, but as the depth increases, the hardness of the material increases. Return to inherent hardness. In example (2), although the hardness requirement is that the grooves are sufficiently grooved, it is necessary to correct the distortion caused by heat treatment, and after correction, the dimensional accuracy remains unstable. Furthermore, decarburization of the material surface is likely to occur due to quenching, which may reduce wear resistance. In example ■, although the hardness is sufficiently satisfactory,
The cost of performing the hardening process is high. In Example (3), a predetermined hardness is achieved by carefully selecting the powder material used for sintering, but the sintering method is prone to the unique problem of generating pores within the structure.
上述の如く、上記４つの従来例に係る問題点を列記した
が、要約すると、問題点は熱処理に伴う歪の問題、該歪
矯正後の寸法精度の不安定化、耐摩耗性の低下、そして
硬化処理のコスト高等である。As mentioned above, the problems associated with the four conventional examples are listed, but to summarize, the problems are distortion caused by heat treatment, instability of dimensional accuracy after correction of the distortion, decrease in wear resistance, and The cost of hardening treatment is high.
本発明の技術的課題
従って、本発明の解決すべき技術的課題は、熱処理、若
しくは硬化処理を行なわすに、所定の硬度を備えている
素材により、低コストなブロック板を形成することにあ
る。Technical Problems of the Present Invention Accordingly, the technical problem to be solved by the present invention is to form a low-cost block plate from a material that has a predetermined hardness when subjected to heat treatment or hardening treatment. .
本発明の要旨（構成・作用・効果）
上記技術的課題を達成するために、本発明は以下の如く
構成した。Summary of the present invention (Structure, operation, effect) In order to achieve the above technical problem, the present invention was constructed as follows.
すなわち、本来的に備わっている高硬度素材たるヘーナ
イト鋼により自動車用キーノリングーのブロック仮を製
造するようにした。That is, the temporary block of the automotive key ring was manufactured using heenite steel, which is an inherently high hardness material.
上記ベーナイト鋼を素材に用いることにより、硬化させ
るための熱処理若しくは硬化処理は不要となる。By using the above-mentioned bainitic steel as a material, heat treatment or hardening treatment for hardening becomes unnecessary.
ところで、ベーナイト鋼とは、みがき特殊鋼を素材とし
、連続的に熱処理を行って製造されたちのであり、Ａｒ
′ 変態点（約５５０℃）からＡｒ″点（約１６０℃）
の間の温度で恒温変態させて析出する組織からなる。特
に、ベーナイト析出温度が低温域にて析出される下部ベ
ーナイトは、粘り強さか犬で、高硬度であり、かつ、加
工硬化性も大きい。By the way, bainitic steel is made from polished special steel and manufactured by continuous heat treatment.
' From transformation point (approx. 550℃) to Ar'' point (approx. 160℃)
It consists of a structure that undergoes constant temperature transformation and precipitates at temperatures between In particular, lower bainite, which is precipitated at a low bainite precipitation temperature, has excellent tenacity, high hardness, and high work hardenability.
かかる素材を用いることにより、冷間ブレス加工により
塑性変形させて異形状な製品を製造するとともに加工硬
化を利用した高硬度化の実現が可能となる。By using such a material, it is possible to produce a product with an irregular shape by plastically deforming it through cold pressing, and to achieve high hardness using work hardening.
しかも、この素材を用いれば、要求される硬変を達成す
るための熱処理若しくは、硬化処理を行なわずして、上
記硬度を達成することができる。Furthermore, by using this material, the above hardness can be achieved without performing any heat treatment or hardening treatment to achieve the required hardness.
因みに、ベーナイト鋼の硬度は、第４図中に示されｒコ
通りである。それ故、熱処理に伴う歪の発生や素材表面
の脱炭等も生じず、コストの低減にら役立つ。Incidentally, the hardness of bainitic steel is as shown in FIG. Therefore, distortion and decarburization of the material surface due to heat treatment do not occur, which helps to reduce costs.
アＭ
以下に、第１〜４図に従って、本発明の実施例を具体的
に説明する。A. Hereinafter, embodiments of the present invention will be specifically described with reference to FIGS. 1 to 4.
第４図は、自動車用キーノリンダーのブロック仮に関す
る該板成形加工後に、上記ブロック仮２０（第３回診１
照）に形成されたキー穴の内面より、（Ｒ方向に各０
、１ ｍｍ毎に離れた位置における硬度を測定し１こ結
果を示す。FIG. 4 shows the block temporary 20 (3rd medical examination 1
From the inner surface of the keyhole formed in the
, the hardness was measured at positions separated by 1 mm, and the results are shown below.
図中、表示の通り、ベーナイト鋼を素材に用いたブロッ
ク板は、従来例である焼結鋼（１）、（ＩＩ）、軟鋼、
軟綱＋チッ化処理等により成形されたものを上まわる硬
度を有する。しかも、表面に近い程、硬度が高くなる加
工硬化性を有しているので、表面近傍では、硬鋼を焼入
・焼戻しした場合の硬度を上回る。さらに、この素材：
ベーナイト鋼は、図中の他の例のような高硬度化のため
の処理を行なわずして上記要求硬度が達成できる素材で
ある。As shown in the figure, block plates made of bainitic steel are conventional examples of sintered steel (1) and (II), mild steel,
It has a hardness that exceeds that formed by soft steel + nitriding treatment. Moreover, since it has work hardening properties such that the closer it is to the surface, the harder it is, the hardness near the surface exceeds that of hardened and tempered steel. Additionally, this material:
Bainitic steel is a material that can achieve the above-mentioned required hardness without undergoing treatment to increase hardness as in the other examples in the figure.
このため、製品に加工した後、熱処理を行って硬度を高
める従来例では、熱歪か発生し、歪矯正作業を行う必要
があるのに対して、本実施例では、全くその必要がない
。それ故、製品としての寸法精度は安定し、製品の不良
率ら低下し、総合的なコストら低下する。For this reason, in the conventional example in which heat treatment is performed to increase hardness after processing into a product, thermal distortion occurs and it is necessary to perform a distortion correction operation, but in the present embodiment, there is no need for such correction at all. Therefore, the dimensional accuracy of the product is stable, the defective rate of the product is reduced, and the overall cost is reduced.
以下に、自動車用キーシリンダーのブロック仮の製造工
法に関する好適例を説明する。A preferred example of a method for temporarily manufacturing a block of an automobile key cylinder will be described below.
第１図は、上記製造工法の一例を示す。本工法は、トラ
ンスファ一方式と呼ばれる工法で、円盤状素材１が、１
列に並んだプレス装置に送り込まれることにより、プレ
ス加工を行う工法である。FIG. 1 shows an example of the above manufacturing method. This construction method is called a transfer one-way construction method, in which the disc-shaped material 1 is
This is a construction method in which press processing is performed by feeding the materials into press machines lined up in rows.
上記工法は、３工程からなる。すなわち、予かしめ用意
された素材１は、以下の工程を経てキーシリンダーのブ
ロック仮となる。The above construction method consists of three steps. That is, the material 1 prepared in advance becomes a temporary block of a key cylinder through the following steps.
第１工程（据込↓ｎ＞
素材１の上面に、第１プレスの上下各金型により、その
中央部が押圧されて、球面状の凹状くぼみ２ａが形成さ
れかつ径方向沿いの７７９２ ｃを形成する一方、その
下面には上面のくぼみ２ａに対応して下方へ突設した凸
状部２ｂか形成される。1st process (upsetting ↓n> The upper surface of the material 1 is pressed by the upper and lower molds of the first press at its center to form a spherical concave depression 2a and 7792c along the radial direction. On the other hand, a convex portion 2b is formed on the lower surface thereof and protrudes downward in correspondence with the recess 2a on the upper surface.
第２工程（押出し工程）
第１工程における加工後、素材１は、第２゛プレスに供
給される。上記溝２ｃにキー大川の凹部３ａが形成され
る一方、下面の上記凸状部２ｂに、上記凹部３ａに対応
して押出された凸部３ｂが形成される。Second step (extrusion step) After processing in the first step, the material 1 is supplied to the second press. A Key Okawa concave portion 3a is formed in the groove 2c, while a convex portion 3b extruded corresponding to the concave portion 3a is formed in the convex portion 2b on the lower surface.
第３工程（打抜き工程）
第２工程における加工後、索材ｌは、第３プレスに供給
される。上記凹部３ａが打ち抜かれるとともに上記凸部
３ｂが除去されてキーシリンダー用のキー穴と略同−の
穴４となる。Third step (punching step) After processing in the second step, the cable material l is supplied to the third press. The concave portion 3a is punched out and the convex portion 3b is removed to form a hole 4 that is substantially the same as a keyhole for a key cylinder.
上記トランスファ一方式では、円盤状の素材１を予かし
め用意する必要があるか、第２図に示す工法、すなわち
順送り方式は、帯状の素材１０を一連のプレス装置に自
動供給されることにより、順次プレス成形されて、製品
か形成される工法である。以下に該工法を簡単に説明す
る。、順送の方式は、９工程からなる工法で、図におい
て、ＩＯは帯状の素材を示し、該素材１０は、図中左よ
り右へ送り装置（図示せず）により一連のプレス金型の
上下合金型間を送られる。In the transfer method described above, is it necessary to prepare the disc-shaped material 1 in advance?In the construction method shown in FIG. This is a method in which the product is formed by sequential press molding. The method will be briefly explained below. The progressive feeding method is a construction method consisting of nine steps. In the figure, IO indicates a strip-shaped material, and the material 10 is passed through a series of press molds from left to right in the figure by a feeding device (not shown). It is sent between the upper and lower alloy molds.
第１工程
帯状素材１０の両端に素材ＩＯの送り兼位置決めのため
の案内切欠き１１が形成される。Guide notches 11 for feeding and positioning the material IO are formed at both ends of the first process strip material 10.
第２工程
第１工程にて形成された案内切欠き１１にプレス装置の
送り位置決め装置が案内される。Second step: The feed positioning device of the press device is guided to the guide notch 11 formed in the first step.
第３工程
上記送り位置決め装置により素材ｌＯカ月つ右隣りの金
型の所定位置まで送られるとともに下向きＹ字状穴！２
（図中斜線部）が明けられる。Third step: The above-mentioned feeding and positioning device feeds the material 10 months to a predetermined position in the mold on the right, and creates a downward Y-shaped hole! 2
(The shaded area in the figure) is opened.
以下、素材ＩＯは同様に１ピツチづつ図中、右方向へ送
られて、夫々の金型により下記のプレス成形がなされて
いく。Thereafter, the material IO is similarly fed one pitch at a time to the right in the figure, and the following press molding is performed by the respective molds.
第４工程
上向きＹ字状穴＋３（図中斜線部）が明けられて、上記
第３工程の下向きＹ字状穴１２と協働してＸ抜穴１３ａ
を形成する。In the fourth step, the upward Y-shaped hole +3 (shaded area in the figure) is opened, and in cooperation with the downward Y-shaped hole 12 in the third step, the X extraction hole 13a is opened.
form.
第５工程
隣り合わせに形成されているＸ抜穴１３ａにより形成さ
れた素材１０の残存平面部に、凹状球形くぼみ１４が形
成されるとともに該くぼみ１４の対面（底面側）に凸状
円形突部（図示せず）が形成される。Fifth step A concave spherical recess 14 is formed in the remaining flat part of the material 10 formed by the X punch holes 13a formed adjacent to each other, and a convex circular protrusion ( (not shown) is formed.
第６エ程
上記くぼみ１４の外周に製品仕上り外Ｊ１５が形取りさ
れる。In the sixth step, a product finish J15 is cut out on the outer periphery of the recess 14.
第７エ程
上記くぼみ１４の中央部にキー穴に相当する凹部１６が
形成される。In the seventh step, a recess 16 corresponding to a keyhole is formed in the center of the recess 14.
第８工程
上記凹部１６が打ち抜かれてキー穴と略同−の穴１７が
形成される。Eighth step: The recess 16 is punched out to form a hole 17 that is substantially the same as the key hole.
第９工程 素材ＩＯより製品が打ち抜かれて穴１８が形成される。9th step A hole 18 is formed by punching out the product from the material IO.
上記両製造工法における、自動車用キーシリンダーのブ
ロック仮２０のキー穴打抜き工程において、特に、上下
各打抜き型（ダイス及びポンチ）の素材打抜き時の径方
向クリアランスが素材板厚の２〜３％に設定されて、打
ら抜きされた場合、打抜き穴の穴内面表層部には、高温
高圧下での金属組織の変態により生成される、いわゆる
白、腎と呼ばれる、硬化層か顕著に具現する。第５図は
第３図のＺ＋ＩＥを写真におさめた倍率１００倍の金属
組織の顕微鏡写真である。該写真によれば、穴内面の表
面より約１０ミクロン程の厚さで、本来の金属相識から
変聾して白ｊ；づの金属組織になっている金属組織状態
（写ｒ（において、表層に白く映し出された部分）か明
確に祠断てきる。この白層は、硬度の高い層であり、該
層表面の耐摩耗性はひと、ゴわ高い。In the key hole punching process of the temporary block 20 of the automobile key cylinder in both of the above manufacturing methods, in particular, the radial clearance of the upper and lower punching dies (dies and punches) when punching the material is 2 to 3% of the material plate thickness. When the punched hole is set and punched, a hardened layer, so-called "white kidney", which is generated by the transformation of the metal structure under high temperature and pressure, is clearly formed on the inner surface of the punched hole. FIG. 5 is a micrograph of the metal structure of Z+IE in FIG. 3 at a magnification of 100 times. According to the photograph, the metal structure is about 10 microns thick from the inner surface of the hole, and the metal structure has changed from the original metal structure to a white metal structure (in the photo, the surface layer This white layer is a highly hard layer, and the abrasion resistance of the surface of this layer is very high.
第１（２］は、本発明の実施例を製品化するための製造
工法の一例を示す工程説明図、第２図は、上記製造工法
の別個を示す工作説明図、第３図は本実施例を具体化し
たブロック板の側面断面図、第４図：１ｂ種ブロック仮
の硬度・表面距離関係線図、第５Ｉ２１は第３図の２部
の金属組織の顕微鏡写真である。
１ 、 Ｉ Ｏ・木４本 ２ａ、１４ 凹状くぼみ、
２ｂ突状部、２ ｃ−溝、ｌ ３ａ、 Ｉ ６−凹部、
３ｂ 凸部、４．１７ キー穴、１１・案内切欠き穴、
１２、＋３−Ｙ字状穴、１３ａ−Ｘ状穴、＋５ 外縁、
１８ 穴、２０ ・ブロック板。
第４７”４
表面（１犯）０・すｎ翻＾修1 (2) is a process explanatory diagram showing an example of the manufacturing method for commercializing the embodiment of the present invention, FIG. 2 is a work explanatory diagram showing the separate manufacturing method, and FIG. A side sectional view of a block plate embodying the example, Fig. 4: Temporary hardness/surface distance relationship diagram for type 1b block, Fig. 5I21 is a micrograph of the metal structure of the second part in Fig. 3. 1, I O・4 trees 2a, 14 concave hollow,
2b protrusion, 2c-groove, l 3a, I 6-recess,
3b Convex part, 4.17 Key hole, 11・Guide notch hole,
12, +3-Y-shaped hole, 13a-X-shaped hole, +5 outer edge,
18 holes, 20 ・Block board. No. 47”4 Surface (1st offense) 0・Sun translation ＾ repair
Claims (1)
用キーシリンダーのブロック板。1. An automobile key cylinder block plate characterized by a bainitic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12682987A JPH0819796B2 (en) | 1987-05-21 | 1987-05-21 | Block plate of automobile key cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12682987A JPH0819796B2 (en) | 1987-05-21 | 1987-05-21 | Block plate of automobile key cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63289180A true JPS63289180A (en) | 1988-11-25 |
| JPH0819796B2 JPH0819796B2 (en) | 1996-02-28 |
Family
ID=14944944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12682987A Expired - Lifetime JPH0819796B2 (en) | 1987-05-21 | 1987-05-21 | Block plate of automobile key cylinder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0819796B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007247244A (en) * | 2006-03-15 | 2007-09-27 | Hitachi Powdered Metals Co Ltd | Cylinder lock device, fixing case therefor, and its manufacturing method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS589944U (en) * | 1981-07-14 | 1983-01-22 | ヤンマーディーゼル株式会社 | Liquid fuel variable device for dual fuel engine |
-
1987
- 1987-05-21 JP JP12682987A patent/JPH0819796B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS589944U (en) * | 1981-07-14 | 1983-01-22 | ヤンマーディーゼル株式会社 | Liquid fuel variable device for dual fuel engine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007247244A (en) * | 2006-03-15 | 2007-09-27 | Hitachi Powdered Metals Co Ltd | Cylinder lock device, fixing case therefor, and its manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0819796B2 (en) | 1996-02-28 |
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