{"id":839,"date":"2020-10-21T22:20:36","date_gmt":"2020-10-21T20:20:36","guid":{"rendered":"https:\/\/lockanalyst.org\/?p=839"},"modified":"2021-06-02T22:16:58","modified_gmt":"2021-06-02T20:16:58","slug":"evolution-of-the-mcs-system","status":"publish","type":"post","link":"https:\/\/lockanalyst.org\/index.php\/2020\/10\/21\/evolution-of-the-mcs-system\/","title":{"rendered":"Evolution of the MCS system"},"content":{"rendered":"\n
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A new sidebar<\/h2>\n\n\n\n
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Like any new technology, the first production will reveal many malfunctions. Especially, opening by forcing technique was possible on the first generation. The sidebar’s stumps was breaking in contact on the stainless steel rotors, the lock could be opened in a very quick time and without any visible external trace. Another problem was the spring allowing the locking of the sidebar, escaping from its housing on cylinders which are in great use and making the locks inoperable. For all these reasons, EVVA introduce since 1985 a new sidebar’s design (N\u00b0380,301).<\/p>\n\n\n\n

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Comme toute nouvelle technologie, la premi\u00e8re production r\u00e9v\u00e8lera beaucoup de probl\u00e8mes. Notamment, l’ouverture en force \u00e9tait possible sur la premi\u00e8re g\u00e9n\u00e9ration. Les pattes de la barre lat\u00e9rale se brisaient en contact avec les rotors en inox, la serrure pouvait \u00eatre ouverte tr\u00e8s rapidement et sans dommages ext\u00e9rieurs apparents. Un autre probl\u00e8me \u00e9tait le ressort permettant le verrouillage de la barre lat\u00e9rale, celui-ci s’\u00e9chappait de son logement sur des cylindres tr\u00e8s utilis\u00e9s et rendait la serrure inop\u00e9rante. Pour toutes ces raisons, EVVA propose d\u00e8s 1985 un nouveau concept de barre lat\u00e9rale (N\u00b0380,301).<\/span><\/em><\/p>\n\n\n\n

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Outer sidebar <\/em>design<\/figcaption><\/figure><\/div>\n\n\n\n
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Austrian patent N\u00b0380,301<\/em><\/figcaption><\/figure><\/div>\n\n\n\n
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Sidebar assembly<\/figcaption><\/figure><\/div>\n\n\n\n
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This new sidebar contains three parts : a inner sidebar, a black plastic cover and a outer sidebar. The plastic cover is fixe in its groove. The inner and outer sidebar sandwich it and can slide on both sides. The inner sidebar has three stumps and a small hole in which the outer sidebar’s stump goes through allowing to connect them during their translation. Once assembled, these two moving parts become one. <\/p>\n\n\n\n

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Cette nouvelle barre lat\u00e9rale est compos\u00e9e de 3 \u00e9l\u00e9ments : une plaque interne, une membrane en plastique noir et une barre externe. La membrane plastique est fixe dans sa rainure. La plaque interne et la barre externe sont prises en sandwich et peuvent glisser sur ces deux faces. La plaque interne poss\u00e8de trois petites pattes et un trou dans lequel la tige de la barre externe passe au travers permettant de les lier pendant leur translation. Une fois assembler, ces deux parties mobiles ne font plus qu’une.<\/span><\/em><\/p>\n\n\n\n

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How it works ?<\/h2>\n\n\n\n
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Global view<\/em><\/figcaption><\/figure><\/div>\n\n\n\n
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New sidebar’s motion without plastic cover<\/em><\/figcaption><\/figure><\/div>\n\n\n\n
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This new design work with a inner little coil spring which allows to compress the two parts sidebar. The lock has two rings allowing to move forward and backward the sidebar. The front ring (locking ring) is on contact with the outer sidebar and the back ring (unlocking ring) touch a spring-loaded pin which slide into the outer sidebar. A small pin limits its stroke. This configuration allows to reduce the contact between the last three magnetic rotors and the sidebar stumps to prevent the use of forcing technique. On the other hand, the first magnetic rotor is binded always first because it will be constrained by the outer sidebar’s stump. <\/p>\n\n\n\n

The black plastic cover avoid sidebar’s corrosion, dust encrustation and also a premature wear of the mechanism by facilitating the sliding of the two locking elements. The plastic cover is made in nylon by injection molding technique, this material has very good self-lubricating properties.<\/p>\n\n\n\n

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Ce nouveau concept fonctionne avec un petit ressort h\u00e9lico\u00efdal qui permet de compresser les deux \u00e9l\u00e9ments de la barre externe. La serrure poss\u00e8de deux anneaux qui ont pour fonction de la mouvoir en avant et en arri\u00e8re. L’anneau le plus proche de l’entr\u00e9e de clef (verrouillage) est en contact avec la barre externe et l’anneau au fond (d\u00e9verrouillage) touche le nez d’une goupille qui coulisse dans la barre externe. Une petite goupille limite sa course. Cette configuration permet de r\u00e9duire les contacts entre les trois derniers rotors magn\u00e9tiques et les mentonnets de la plaque interne afin d’emp\u00eacher l’utilisation de clefs de force. Par contre, le premier rotor magn\u00e9tique sera le plus sollicit\u00e9 car il sera le premier contraint par le mentonnet de la barre externe.<\/span><\/em><\/p>\n\n\n\n

La membrane en plastique noir \u00e9vite la corrosion de la barre lat\u00e9rale, l’incrustation des poussi\u00e8res et l’usure pr\u00e9matur\u00e9e du m\u00e9canisme en facilitant le glissement des deux \u00e9l\u00e9ments de blocage. La membrane plastique est fabriqu\u00e9e en nylon par moulage (injection plastique), ce mat\u00e9riau pr\u00e9sente d’excellentes propri\u00e9t\u00e9s d’auto-lubrification.<\/span><\/em><\/p>\n\n\n\n

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Accidental openings vs oscillations<\/h2>\n\n\n\n
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Pendulum effect<\/em><\/figcaption><\/figure><\/div>\n\n\n\n
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On the first generation, it happens that a correct key opens only once in three attempts. Yet the friction, which we mentioned in the previous article, was known to engineers from the start of production in 1982. As a result, the response time of the magnetic rotors is too long. A false key can simulate an approximate orientation by inserting it more or less into the lock and generate accidental partials unlockings (2).<\/p>\n\n\n\n

In addition, the mass of the magnet and its stainless steel capsule creates inertia when rotating. There is no contact with the key, only the magnetic field influences the rotation of the magnetic rotor. Engineers observe a pendulum effect estimated at about \u00bd second causing uncertainty in the orientation of the magnetic rotor (2). The rotors position themselves less quickly than the key insertion time. A way must then be found to brake the rotor sufficiently to avoid this phenomenon.<\/p>\n\n\n\n

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Sur la premi\u00e8re g\u00e9n\u00e9ration, il arrive parfois que la bonne clef ouvre une fois sur trois. Pourtant la friction que nous avons \u00e9voqu\u00e9 dans le pr\u00e9c\u00e9dent article, \u00e9tait connue des ing\u00e9nieurs lors du lancement de la production en 1982. Il en r\u00e9sulte que le temps de r\u00e9ponse des rotors magn\u00e9tiques est trop long. Une fausse clef pourra simuler une orientation approximative en l\u2019ins\u00e9rant plus ou moins dans la serrure et g\u00e9n\u00e9rer des “entrouvertures” accidentelles (2).<\/span><\/em><\/p>\n\n\n\n

De plus, la masse de l\u2019aimant et de sa capsule en inox cr\u00e9e une inertie en tournant.  Il n\u2019y a aucun contact avec la clef, seul le champ magn\u00e9tique influence la rotation du rotor magn\u00e9tique. Les ing\u00e9nieurs constatent alors un effet de pendule estim\u00e9 \u00e0 environ \u00bd seconde provocant une incertitude de l\u2019orientation du rotor magn\u00e9tique (2). Ceux-ci se positionnent moins vite que le temps d\u2019insertion de la clef. Il faut alors trouver un moyen de freiner le rotor suffisamment pour \u00e9viter ce ph\u00e9nom\u00e8ne.<\/span><\/em><\/p>\n\n\n\n

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New rotor design<\/h2>\n\n\n\n
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New core with a magnetisable ring and a rotor’s axis<\/em><\/figcaption><\/figure>\n\n\n\n
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New rotor design<\/em><\/figcaption><\/figure><\/div>\n\n\n\n
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Rotor brake system (Austrian patent N\u00b0387,065)<\/em><\/figcaption><\/figure><\/div>\n\n\n\n

In 1988, EVVA modify the production of the magnetic rotor to resolve the oscillation problem. This new system consist to create an induced magnetic field to brake the rotor sufficiently. This design is very efficient and allows to increase the accuracy of orientation of each rotors.<\/p>\n\n\n\n

This device contains a little ring made in magnetisable material (ferrit) and a rotor. A ball-bearing is punch in a small hole and sit on a rotor housing’s axis to reduce friction like a spinning tops. When no key is inserted, the rotor levitates in equilibrium under the influence of the ring’s magnetic field and the ball is in contact with the inner sidebar. When a correct key is inserted, the rotor jump up and rotate around the ball-bearing until the key stops. The magnetized ring (by the rotor magnets) brake the rotor’s inertia and the key magnet are platted at the bottom of their housing. The ring has the advantage of protecting each rotor from the magnetic field of the neighboring rotor but it keeps in memory a reverse polarity and so the orientation of magnetic rotor.<\/p>\n\n\n\n

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En 1988, EVVA modifie la production des rotors magn\u00e9tiques afin de r\u00e9soudre les probl\u00e8mes d’oscillations. Ce nouveau syst\u00e8me consiste \u00e0 cr\u00e9er un champ magn\u00e9tique induit pour freiner suffisamment le rotor. Ce concept est tr\u00e8s efficace et permet d’augmenter la pr\u00e9cision de l’orientation de chaque rotor. <\/span><\/em><\/p>\n\n\n\n

Ce dispositif est constitu\u00e9 d’un petit anneau fabriqu\u00e9 en mat\u00e9riau magn\u00e9tisable (ferrite) et d’un rotor. Une bille est enfonc\u00e9e en force dans un petit trou et repose sur l’axe du logement du rotor afin de r\u00e9duire<\/em><\/span> la friction comme le ferait une toupie. Quand aucune clef est ins\u00e9r\u00e9e, le rotor l\u00e9vite en \u00e9quilibre sous l’influence du champ magn\u00e9tique de l’anneau et la bille est en contact avec la plaque interne. Quand la bonne clef est ins\u00e9r\u00e9e, les rotors s’\u00e9jectent vers l’ext\u00e9rieur de leur logement et tournent autour de la bille jusqu’\u00e0 ce que la clef soit en but\u00e9e. L’anneau magn\u00e9tis\u00e9 (par l<\/span>‘<\/em><\/span>aimant du rotor) freine l’inertie du rotor et les aimants de la clef les plaquent au fond de leur logement. L’anneau a l’avantage de prot\u00e9ger chaque rotor du champ magn\u00e9tique du rotor voisi<\/span><\/em>n, mais il garde en m\u00e9moire la polarit\u00e9 inverse et ainsi l’orientation du rotor magn\u00e9tique.<\/em><\/span><\/p>\n\n\n\n

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Reset and locking plastic rings<\/em><\/figcaption><\/figure><\/div>\n\n\n\n
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After 1989, ZEISS IKON became ZI IKON and will produce a third generation with some new improvements. The reset and locking rings are made in nylon to reduce the sidebar’s friction and avoid the use of forcing technique. All magnetic rotors are made in plastic which make them as light as possible to prevent inertia effect. A new spacer is special made in stainless steel (sheet-metal) with four holes in which the rotor’s axis is housed and four oblong openings allowing the sidebar’s stumps to slide foreward. This last element separates the sliding movement of the sidebar from the rotational movement of the magnetic rotors.<\/p>\n\n\n\n

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Apr\u00e8s 1989, ZEISS IKON devient ZI IKON et produira une troisi\u00e8me g\u00e9n\u00e9ration avec de nouvelles am\u00e9liorations. Les anneaux de verrouillage et de d\u00e9verrouillage sont d\u00e9sormais fabriqu\u00e9s en nylon pour r\u00e9duire les frictions avec la barre lat\u00e9rale et emp\u00eacher l’usage des clefs de force. Tout les rotors magn\u00e9tiques sont aussi en plastique afin de les all\u00e9ger le plus possible pour \u00e9viter l’effet d’inertie. Une entretoise est sp\u00e9cialement con\u00e7ue en clinquant inox avec quatres trous dans lesquels les axes des rotors viennent se loger et quatres ouvertures oblongues permettant aux mentonnets de la barre lat\u00e9rale de glisser vers l’avant.<\/span><\/em> Ce dernier \u00e9l\u00e9ment permet de s\u00e9parer le mouvement de glissement de la barre lat\u00e9rale du mouvement de rotation des rotors magn\u00e9tiques.<\/span><\/em><\/p>\n\n\n\n

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Sheet-metal spacer with its four holes<\/em><\/figcaption><\/figure><\/div>\n\n\n\n
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New plastic rotors<\/em><\/figcaption><\/figure><\/div>\n\n\n\n
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The technology of this atypical lock will remain unchanged until the arrival of the new EVVA MCS in 1995.<\/p>\n\n\n\n

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La technologie de cette serrure atypique restera inchang\u00e9e jusqu’\u00e0 l’arriv\u00e9e de la nouvelle EVVA MCS en 1995.<\/span><\/em><\/p>\n\n\n\n

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Cocolitos<\/p>\n\n\n\n

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(1) “Hi<\/a>gh-Security Mechanical Locks: An Encyclopedic Reference”, 2007, Graham W. Pulford, Butterworth-Heinemann, p459-463<\/em><\/p>\n\n\n\n

(2) Austrian patent N\u00b0387,065<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

A new sidebar Like any new technology, the first production will reveal many malfunctions. Especially, opening by forcing technique was possible on the first generation. The sidebar’s stumps was breaking in contact on the stainless steel rotors, the lock could be opened in a very quick time and without any visible external trace. Another problem…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-839","post","type-post","status-publish","format-standard","hentry","category-non-classe"],"_links":{"self":[{"href":"https:\/\/lockanalyst.org\/index.php\/wp-json\/wp\/v2\/posts\/839"}],"collection":[{"href":"https:\/\/lockanalyst.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lockanalyst.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lockanalyst.org\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lockanalyst.org\/index.php\/wp-json\/wp\/v2\/comments?post=839"}],"version-history":[{"count":146,"href":"https:\/\/lockanalyst.org\/index.php\/wp-json\/wp\/v2\/posts\/839\/revisions"}],"predecessor-version":[{"id":1649,"href":"https:\/\/lockanalyst.org\/index.php\/wp-json\/wp\/v2\/posts\/839\/revisions\/1649"}],"wp:attachment":[{"href":"https:\/\/lockanalyst.org\/index.php\/wp-json\/wp\/v2\/media?parent=839"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lockanalyst.org\/index.php\/wp-json\/wp\/v2\/categories?post=839"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lockanalyst.org\/index.php\/wp-json\/wp\/v2\/tags?post=839"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}