DE2326797A1

DE2326797A1 - METAL SEARCH STATION FOR FERROUS OR NON-FERROUS METAL OBJECTS TO PREVENT AIRCRAFT, ARMED OVERFLOWS, ETC.

Info

Publication number: DE2326797A1
Application number: DE2326797A
Authority: DE
Inventors: Solomon Heytow
Original assignee: Individual
Current assignee: Individual
Priority date: 1972-05-26
Filing date: 1973-05-25
Publication date: 1973-12-06
Also published as: FR2189756A1; JPS4963462A; IT990589B; IL42338A; AU5620573A; GB1436900A; CA1080821A; IL42338A0; FR2189756B1; ES415206A1

Description

PATENTANWÄ LT E W Augiburg-Goggingen 22, den PATENT ANWÄ LT E W Augiburg-Goggingen 22, den

von-Eichendorff-StraBe 10von-Eichendorff-Strasse 10

DR. TNG. E. LIEBAU HDR. TNG. E. LIEBAU H

H 9U5 -_rirn4II Unser Zeichen ^Ά ^ ¹^⁰ H 9U5 - _rirn4II Our sign ^Ά ^ ¹ ^ ⁰

DIPL. ING. G. LIEBAU (Bei Rückantwort bitte angeben) DIPL. ING. G. LIEBAU (please specify when replying)

Ihr ZeichenYour sign

Solomon HeytowSolomon Heytow

23551 Burton Street,23551 Burton Street,

Canoga Park, California, USACanoga Park, California, USA

Metallsuchstation für eisenhaltige oder nichteisenhaltige Metallgegenstände zur Vorbeugung von Plugzeugentführungen,Metal detection station for ferrous or non-ferrous Metal objects for the prevention of plug-and-play hijacking,

"bewaffneten Überfällen und dgl."armed raids and the like.

Die vorliegende Erfindung bezieht sich auf eine Anlage zur Aufdeckung der Bewegung eisenhaltiger oder nichteisenhaltiger Metallgegenstände durch eine Metallsuchstation. The present invention relates to a system for Detection of the movement of ferrous or non-ferrous metal objects by a metal detection station.

In den letzten Jahren ist das rasch zunehmende Auftreten von Elugzeugentführungenji Grefängnisausbrüchen und bewaffneten Überfällen auf Anstalten möglich gewesen,; da es keine ge eignete Einrichtung: zur Aufdeckung der Bewegung versteckterIn recent years, the occurrence is rapidly increasing has been possible from aircraft hijackings, prison breakouts and armed attacks on institutions; since there is no ge Appropriate facility: to reveal the movement of hidden

Telefon (0821) 93077 Teltgr.-Adr.: ELFATENT — Auflsburfl Postscheckkonto München «510-80? DeutscherBank AG Aufltburff, Kto.-Nr. 08/34 Telephone (0821) 93077 Teltgr.-Adr .: ELFATENT - Auflsburfl Postscheckkonto Munich «510-80? DeutscherBank AG Aufltburff, account no. 08/34

BankleitzaW 720 700Bank domicile 720 700

eisenhaltiger oder niohteisenhaltiger Gegenstände gegeben hat, die sich durch eine beschränkte Zone bewegen.ferrous or non-ferrous objects moving through a restricted area.

Auch wo Metallsuchanlagen seit einiger Zeit bekanntgeworden sind, waren die bisher konstruktierten nicht praktisch, weil dann, wenn die Anlage empfindlich genug gemacht worden war, um die Bewegung versteckter eisenhaltiger oder.nichteisenhaltiger Metallgegenstände, wie z.B. einer Feuerwaffe in einem kontrolliert, aufzudecken, so war auch die Anlage durch die Bewegung einsenhaltiger oder nichteisenhaltiger-Metallgegenstände beeinflußt bzw. beeinträchtigt, die sich außerhalb der kontrollierten Zone bewegen. Ist beispielsweise eine Me$allsuchstation der bisher bekannten Bauarten in einem Flugplatz, an einer Bushaltestelle oder einer lisenbahnhaltestelle installiert, wird durch die Bewegung der Flugzeuge, Omnibusse oder Eisenbahnzüge ein Signal in der Sushstation erzeugt, welches dieBedienungsperson verarsaehen kann. Ist ferner die Station weit genug τοη diesen Fahrzeugen aufgebaut, so daß die Station durch ihre Bewegung nicht beeinträchtigt wird, entstehen zusätzliche Probleme dadurch, daß die Angestellten der Anstalt in der Uäh@ der Außenwände der Anstalt gehen, aber gleichzeitig Metallgegenstände, wie z.B. Eimer oder Werkzeuge tragen. Diese Probleme entstehen, da die von den Angestellten getragenen Metallgegenstände auch einen Ausgang in der Station erzeugt, welcher die Bedienungsperson verwirrt und zur. Zunichtemachung der Metallsuchstation seitens einer Person führen kann, welche die Defekte der Station verstanden hat.Even where metal detection systems have been known for some time, those that have been constructed so far have not been practical because then when the plant had been made sensitive enough to prevent the movement of hidden ferrous or non-ferrous To uncover metal objects, such as a firearm in a controlled, so the system was through the movement of ferrous or non-ferrous metal objects affects or affects who move outside the controlled zone. Is for example a search station of the previously known types in an airport, a bus stop or a train stop installed, the movement of planes, buses or trains sends a signal in the Sush station generated, which the operator provides can. Furthermore, the station is far enough τοη these vehicles built so that the station is not affected by its movement, additional problems arise by the fact that the employees of the institution in the Uäh @ der Outside walls of the institution go, but at the same time carry metal objects such as buckets or tools. These problems arise as the metal objects carried by the employees also creates an output in the station which confuses the operator and leads to the. Annihilation the metal detection station on the part of a person who has understood the defects of the station.

Würden ferner Versuche gemacht, die Suchanlagen nach dem vorbekannten Stand der Technik in Strafanstalten zu errichten, wurden ähnliche Probleme entstehen, wenn Metalltüren in der Nähe der Metallsuchstation geöffnet oder geschlossen werden.Would further attempts made to build the search systems based on the prior art, in prisons, similar problems were created when metal doors are opened near the metal detector station or closed.

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Obwohl einige der oben beschriebenen Probleme vermindert werden können, indem die Metallsuchstation nach dem Stand der Technik sorgfältig an einer geeigneten Stelle aufgestellt wird, können gelegentliche Bewegungen großer Metallgegenstände innerhalb der Anstalt im Bereich der Metallsuchstation das Gleichgewicht der Anlage umwerfen. Handelt es sich dabei um eine tragbare Metallsuchstation, so treten die oben beschriebenen Probleme dauernd wieder auf, sobald die Metallsuchstation verschoben wird, wie z.B. dann, wenn die Metallsuchstation in einem Flugplatz von einem Tor zu einem anderen bewegt wird.Although some of the problems described above can be alleviated by using the prior art metal detector If technology is carefully placed in a suitable location, occasional movements of large metal objects can occur overturn the equilibrium of the system within the institution in the area of the metal search station. Is that what it is? For example, when it comes to a portable metal detector, the problems described above keep recurring as soon as the metal detector is used is moved, such as when the metal detection station in an airfield from a gate to a other is moved.

Diese Schwierigkeiten geben die Anregung, daß es wünschenswert wäre, eine Metallsuchstation auf solche Weise zu konstruieren, daß sie durch Bewegungen eisenhaltiger oder nichteisenhaltiger Metallgegenstände außerhalb der Station^nicht beeinflußt bzw. beeinträchtigt wird. Dies führt jedoch zum wesentlichen und bisher ungelösten Problem, da die Station, um nützlich zu sein, empfindlich genug sein muß, um Gegenstände wie z»B, eine kleine Handfeuerwaffe, aufzuspüren, wobei Jedoch ausgerechnet diese Empfindlichkeit bei den Metallsuchanlagen nach dem Stand der Technik diese Anlagen auf Gegenstände empfindlich machte, die sich außerhalb der Station bewegen, so daß, wie oben erwähnt, diese Probleme noch komplizierter wurden, wenn ein zusätzliches Erfordernis aufgestellt wurde, daß die Station tragbar oder bewegbar sein soll.These difficulties suggest that it would be desirable to construct a metal detection station in such a way that that they become more ferrous or non-ferrous through movement Metal objects outside the station ^ is not influenced or impaired. However, this leads to essential and so far unsolved problem, since the station, in order to be useful, must be sensitive enough to handle objects like tracking down a small handgun, where However, it is precisely this sensitivity in the metal detection systems according to the prior art that these systems have Sensitive objects moving outside the station so that, as mentioned above, these problems still exist became more complicated when an additional requirement was placed that the station be portable or movable target.

Bei der entsprechend den Grundsätzen der vorliegenden Erfindung konstruierten Metallsuchstation sind diese Schwierigkeiten überwunden, indem die Metallsuchstation mit einer Abschirmung versehen ist, die. elektromagnetischen Einflüssen vorbeugt,,die durch eisenhaltige oder nichteisenhart ige Me-These difficulties are faced with the metal locator station constructed in accordance with the principles of the present invention overcome by the metal detection station with a shield is provided that. prevents electromagnetic influences caused by ferrous or non-ferrous

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tallgegenstände verursacht werden, die sich außerhalb der Station bewegen, so daß sie keine nennenswerte Wirkung auf die Metallsuohanlage innerhalb der Station haben. Dies wird erzielt, indem die Spulen oder Schleifen in der Metallsuchstation in Abstand voneinander und parallel zueinander angeordnet sind. Diese Anordnung ermöglicht es, daß die Wände der Metallsuchstation durch starre Befestigung von eisenhaltigem Metallblech an den Wänden abgeschirmt sind. Auf diese Weise üben eisenhaltige oder nichteisenhaltige Metallgegenstände, die sich neben der Station bewegen, keine nennenswerte Wirkung auf die Suchanlage in der Station aus.tall objects moving outside the station, so they have no noticeable effect have the metal base plant inside the station. this is achieved by placing the coils or loops in the metal locator at a distance from one another and parallel to one another are arranged. This arrangement makes it possible that the walls of the metal detection station by rigid attachment of ferrous sheet metal on the walls are shielded. In this way, practice ferrous or non-ferrous Metal objects that move next to the station do not have any noticeable effect on the search system in the station.

Daher ,ist ein wichtiges Ziel der vorliegenden Erfindung die Schaffung einer tragbaren Metallsuchstation zur Auffindung der Bewegung eisenhaltiger oder nichteisenhaltiger Metallgegenstände, die durch die Station liindurch gehen, die durch die Bewegung eisenhaltiger oder nichteisenhaltiger Gegenstände, die sich außerhalb der Station bewegen, nicht nennenswert beeinflußt bzw. beeinträchtigt ist.Therefore, an important object of the present invention is that Creation of a portable metal search station to find the movement of ferrous or non-ferrous metal objects, who go through the station, who not caused by the movement of ferrous or non-ferrous objects moving outside the station is significantly influenced or impaired.

Ein weiteres wichtiges Ziel der vorliegenden· Erfindung ist die Schaffung einer tragbaren Metallsuchstation, welche eine Suchanlage zur Auffindung eisenhaltiger und nichteisenhaltiger Metallgegegenstände innerhalb der Station aufweist und Wände hat, welche den Innenraum der Station von Einflüssen abschirmen, welche durch die Bewegung eisenhaltiger oder nichteisenhaltiger Metallgegenstände verursacht sind, die neben der Station bewegt werden.Another important object of the present invention is the creation of a portable metal search station, which is a search system for finding ferrous and non-ferrous Has metal objects within the station and has walls that protect the interior of the station from influences shield caused by the movement of ferrous or non-ferrous metal objects that next to the station.

Diese und weitere Ziele der vorliegenden Erfindung erhellen noch besser anhand der nachfolgenden Beschreibung und der beigefügten Zeichnungen; darin zeigen:These and other objects of the present invention will illuminate even better with reference to the following description and the accompanying drawings; show in it:

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Pig. 1 eine perspektivische Ansicht der Metallsuchstation, die entsprechend den Grundsätzen der vorliegenden Erfindung konstruiert ist; :Pig. 1 is a perspective view of the metal search station, which is constructed in accordance with the principles of the present invention; :

Pig. 2 eine Draufsicht, teilweise weggebrochen, entlang der Linie 2.2. der Pig. 1;Pig. 2 is a plan view, partly broken away, along the line 2.2. the pig. 1;

Pig. 3 eine'perspektivische Ansicht eines Abschnittes einer Wand, wobei Teile der elektrischen Suchanlage in Stellung gezeigt sind;Pig. 3 is a perspective view of a portion of a Wall with parts of the electrical search system shown in position;

Pig. 4 eine Schnittansicht entlang der Linie 4-4- nach Pig. 2;Pig. 4 is a sectional view along the line 4-4 according to Pig. 2;

Pig. 5 eine vergrößerte schematische Ansicht eines Abschnittes der Spannungsphasenausgleichseinrichtung in der Metallsuchanlage; - iPig. Figure 5 is an enlarged schematic view of a portion of the voltage phase compensator in the metal detector; - i

Pig. 6- eine Schnittansicht entlang der Linie 6-6 der Pig. 5;Pig. 6- is a sectional view taken along line 6-6 of Pig. 5;

Pig. 7 eine perspektivische Ansicht einer anderen Ausführungsform einer Metallsuchstation zur Verwendung zum Auffinden der Anwesenheit eisenhaltiger oder nichteisenhaltiger Metallgegenstände, die im Gepäck oder in Säcken versteckt sind, welche normalerweise solche Gegenstände nicht enthalten.Pig. Figure 7 is a perspective view of another embodiment of a metal locator station for use in locating the Presence of ferrous or non-ferrous metal objects, that are hidden in luggage or bags that normally do not contain such items.

Pig. 8 ein Schaltbild der Metallsuchstation;Pig. 8 is a circuit diagram of the metal search station;

Pig. 9 eine schematische Ansicht der Stellung der Senderund Empfängerschleifen in der Station sowie die Stellung der Plügelsehleifen, während sich ein 'Zielgegenstand durch die Station hindurch bewegt;Pig. 9 is a schematic view of the position of the transmitters and Receiver loops in the station as well as the position of the plucking loops while a 'target object is through moves the station through;

Pig. 10 eine Spannungskurve in den Empfängerschleifen, welche durch die Bewegung eines Zieles durch die Metallsuchstation ohne der Anwensenheit der Plügelsohleifen verursacht ist?Pig. 10 shows a voltage curve in the receiver loops, which by moving a target through the metal locator is caused without the presence of the plush sole?

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Fig*." 11 die Disloriminatorkurve, welche in der Empfängersclileife durch die Flügelschleifen erzeugt istj undFig *. "11 the disloriminator curve, which in the receiver class is generated by the wing loopsj and

Pig, 12 eine perspektivische schematisehe Ansicht der, Sender- und Empfängerschleifen und der FlügelschleifenoPig, 12 is a perspective schematic view of the transmitter and receiver loops and the wing loop o

Bezugnehmend auf Fig«, 1 der Zeichnungen ist eine im allgemeinen mit dem Bezugszeichen 10 bezeichnete Metallsuchstation zur Auffindung eisenhaltiger oder nichteisenhaltiger Metallgegenstände in der hier gezeigten bestimmten Ausführungsform tragbar ausgebildet und weist eine Stütz- oder Tragkonstruktion auf, welche in Form einer Türöffnung oder eines Türeinganges ausgebildet ist· Die Stützkonstruktion hat eine Bodenwand 12, Seitenwände 14 und 16 und eine Oberwand · 18, welche sämtlich starr aneinander befestigt sind. Wie in der Zeichnung gezeigt, ist die Station groß genug, damit eine Person durchgehen kann. Die Wände der Statfon sind in Schichten gebildet, wobei die Außensohicht aus einem Isoliermaterial, wie z.B. Kunststoff oder Sperrholz hergestellt ist. Metallblech 20, das aus einem eisenhaltigen Material oder einem Wirkstoff hergestellt ist, welcher dieselben elektromagnetischen Eigenschaften wie Eisen hat, ist innerhalb der Seitenwände 14 und 16, der Bodenwand 12 und der Oberwand 18 vorgesehen, um eine Abschirmung für die Station zu bilden, so daß sich außerhalb der Station bewegende eisenhaltige oder nichteisenhaltige Metallgegenstände keine nennenswerte Wirkung auf eine sich in der Station befindliche Suchanlage haben, siehe die Figuren 2 und 4. Das Metallblech 20 ist gegen die Innenoberfläehe der Wände mit Hilfe eines leichten, billigen, röhrenförmigen Versteigungsmaterials 22, siehe Fig. 4, steif und sicher flach in Stellung gehalten. Bei dieser Anordnung *'i das Blech zwischen den Außenwänden und dem zellenartigen Material gepreßt bzw. zusammengedrückt, so daß es nicht ge-Referring to Figure 1 of the drawings, one is general with the reference numeral 10 designated metal search station to find ferrous or non-ferrous Metal objects in the particular embodiment shown here designed portable and has a support or support structure, which in the form of a door opening or a The supporting structure has a bottom wall 12, side walls 14 and 16 and a top wall 18, which are all rigidly attached to one another. As shown in the drawing, the station is big enough to accommodate a Person can go through. The walls of the statfon are in layers wherein the outer layer is made of an insulating material such as plastic or plywood. metal sheet 20, which is made of a ferrous material or an active ingredient, which the same electromagnetic Has properties like iron is provided within the side walls 14 and 16, the bottom wall 12 and the top wall 18, to form a screen for the station so that ferrous or non-ferrous metal objects moving outside the station have no appreciable effect have a search system located in the station, see Figures 2 and 4. The metal sheet 20 is against the inner surface of the walls with the aid of a light, inexpensive, tubular stiffening material 22, see Fig. 4, rigid and held securely in place. With this arrangement * 'i the sheet metal between the outer walls and the cell-like Material pressed or compressed so that it does not

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stört wird, wenn die Station "bewegt wird. Dies ist wichtig, da jede Störung in der Metallabschirmung das elektromagnetische EeId in der Station stören und Fehler einführen kann.disturbs when the station "is moved. This is important since any disturbance in the metal shielding can disturb the electromagnetic EeId in the station and introduce errors.

Wie in Pig. 1 gezeigt, sind drei im allgemeinen identische Spulen oder Einzeldrahtschleifen 24₉ 26 und 28 in den Wänden der Station 10 in Abstand voneinander angeordnet. Diese Schleifen erstrecken sich, um die Station herum innerhalb der Bodenwand 12, den Seitenwänden 14 und 16 und der Oberwand 18. Die Drahtschleife 26 ist die energieübertragende Schleife und im Mittelpunkt der Station angeordnet, wie in den Pig. 1 und 2 gezeigt. Die Energieempfängerschleifen 24 und 28 sind an jeder Seite der Übertragungssehleife 2"6 im gleichen Abstand von der Übertragungsschleife angeordnet und zwar aus nachfolgend zu beschreibenden Gründen. Wie in den Pig. 1 und 9 gezeigt, sind die Schleifen bei dieser bestimmten Ausführungsform in Ebenen angeordnet, die zum Durchgangsweg durch die Metallsuchstation senkrecht verlaufen«, Unter gewissen Umständen können jedoch die Q-rundsätze der folgenden Erfindung mit im allgemeinen parallelen Spulen oder Schleifen praktisch verwirklicht werden, die in Ebenen angeordnet · sind, welche zum Durchgang durch die Station nicht senkrecht verlaufen.Like in Pig. As shown in Fig. 1, three generally identical coils or loops of single wire 24, _9, 26 and 28 are spaced apart in the walls of station 10. These loops extend around the station within bottom wall 12, side walls 14 and 16, and top wall 18. Wire loop 26 is the energy transmitting loop and is located in the center of the station, as in the Pig. 1 and 2 shown. The energy receiving loops 24 and 28 are located on either side of the transmission loop 2 "6 equidistant from the transmission loop for reasons to be described below. As shown in Figures 1 and 9, in this particular embodiment the loops are arranged in planes, which are perpendicular to the passageway through the metal detection station ". However, in certain circumstances the Q-rounds of the present invention may be practiced with generally parallel coils or loops arranged in planes which are not perpendicular to passage through the station.

Es ist notwendig, die Draht sohl elf en ziemlich starr in der Station zu befestigen, da jede nennenswerte Bewegung der Drahtschleifen das elektromagnetische PeId stören würde, wodurch das elektromagnetische PeId aus dem Gleichgewicht gebracht und ein Pehler eingeführt werden kann. Um die Drahtschleifen starr in Stellung zu halten, sind Streifen 30, die aus Holz, Kunststoff oder einem anderen beliebigen geeigneten Isoliermaterial hergestellt sind, in den Wänden der Station vorgesehen, wobei diese Streifen mit Nuten oder Kanälen 32It is necessary to keep the wire soles fairly rigid in the To fix the station, since any significant movement of the wire loops would disturb the electromagnetic PeId, thereby unbalancing the electromagnetic peId and a blunder can be introduced. To the wire loops To hold rigidly in place are strips 30 made of wood, plastic or any other suitable suitable Insulating material is provided in the walls of the station, these strips having grooves or channels 32

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versehen sind, in welchen die Drahtsohleifen auf eine "beliebige geeignete Weise befestigt sind. Bei der hier gezeigten Äusführungsform sind die Schleifen so in Stellung angeordnet, daß die Person oder das Ziel sich durch die Schleifen bewegt. Unter gewissen Umständen können jedoch die Grundsätze der vorliegenden Erfindung mit im allgemeinen parallelen Schleifen verwirklieht werden können, welche so angeordnet sind, daß das Ziel nicht durch sich hindurchgeht·are provided, in which the wire soles on an "arbitrary are attached in a suitable manner. In the embodiment shown here, the loops are arranged in such a way that that the person or target moves through the loops. In certain circumstances, however, the principles of the present Invention can be embodied with generally parallel loops which are arranged so that the goal does not go through

Ein im allgemeinen herkömmlicher mit Transistoren versehener Oszillator 34 ist auf einer abnehmbaren Stütze in der Wand 14 der Station im Bereich 36 angeordnet, siehe Pig. 1 und 8. Der Oszillator enthält einen Transformator 38, der eine Doppelfunktion hat, in dem er mit den Schaltungselementen in dem Oszillator zusammenarbeitet, um die Oszillatorfrequenz bei 24 kc zu erzeugen, welche sich als geeignet herausgestellt hat, obwohl auch andere Frequenzen verwendet werden können, wobei zusätzlich die Sekundärspule des Transformators mit der Zentralübertragungsschleife 26 gekoppelt ist und die Funktion hat, um die Impedanz der E'inzelwicklungsmittelübertragungsschleife 26 mit der Oszillatorimpedanz anzupassen, wodurch die Notwendigkeit für Mehrfachwicklungsspulen sowie die durch die Verwendung solcher Spulen einzuführenden Fehler beseitigt sind.A generally conventional transistorized oscillator 34 is on a removable support in wall 14 of the station located in area 36, see Pig. 1 and 8. The oscillator includes a transformer 38 which has a dual function by working with the circuit elements in the oscillator to set the oscillator frequency 24 kc, which has been found to be suitable, although other frequencies can also be used, in addition, the secondary coil of the transformer is coupled to the central transmission loop 26 and the function has to match the impedance of the single winding means transmission loop 26 with the oscillator impedance, whereby eliminates the need for multiple winding coils and the errors introduced by the use of such coils are.

Der Oszillator wird mit Hilfe einer Batterie 40 mit Strom versorgt, deren Pösitivseite mit dem Emitter eines p-n-p-Transistors in dem dargestellten Oszillator verbunden ist. Ein aus dem Abgriff 39 im Transformator 38 abgenommener HilfsSpannungsausgang befindet sich um 90° außer Phase mit der Spannung aus dem Hauptausgang, der zur Schleife 26 geht. Diese Spannung wird durch die Leitung 42 und von dort zum Stromschalter 44 zugeführt. Der Schalter 44 ist mit demThe oscillator is supplied with current by means of a battery 40, the positive side of which is connected to the emitter of a p-n-p transistor is connected in the illustrated oscillator. One removed from the tap 39 in the transformer 38 Auxiliary voltage output is 90 ° out of phase with the voltage from the main output going to loop 26. This voltage is passed through the line 42 and from there to the Power switch 44 supplied. The switch 44 is with the

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drehbaren Arm 46 des Dreikontakts ehalt ers 48 verbunden. Der Schalter 48 weist Kontakte 52, 54 und 56 auf, wie gezeigte Der Kontakt 54 ist ein PrüfStellungskontakt, wobei seine physikalische Stelle aus Gründen, die nachfolgend beschrieben werden, wichtig ist, da, wenn der Arm 46 mit dem Kontakt 54 in Armlage kommt und kein Zielgegenstand in der Station vorhanden ist, kein Ausgang aus der Metallsuchstation vorliegt. Ein Batterieprüf messer 50, der zwischen den Leitungen 42 und 43 geschaltet ist, ist wie gezeigt vorgesehen, um den Zustand der Batterie anzuzeigen.rotatable arm 46 of the three-contact ehalt ers 48 connected. Of the Switch 48 has contacts 52, 54 and 56 as shown The contact 54 is a test position contact, its physical location is important for reasons to be described below, since when the arm 46 is in contact 54 comes into arm position and there is no target object in the station, there is no exit from the metal search station. A battery tester 50 connected between lines 42 and 43 is provided as shown, to display the condition of the battery.

Zwei kleine Einzelwicklungsflügelschleifen 58 und 60 sind miteinander verbunden und haben in Abstand voneinander angeordnete Kontakte 52 und 56, wie in Fig. 8 gezeigt, weil sie auf der Seitenwand 14 in einer Ebene angeordnet sind, welche zu den Ebenen senkrecht verläuft, die durch die Schleifen 24, 26 und 28 gebildet sind, Pig. 9 und 12. Wie in Pig. 2 gezeigt, liegt die Plügelsehleife 58 näher der Empfängerschleife 24, während die Plügelschleife 60 näher der Empfängerschleife 28 liegt. Die Stellung des Armes 46 in Bezug auf den Kontakt 52 und 56 bestimmt den Eingang und Ausgang der Station 10, da durch einfaches Bewegen des Armes 46 von dem Kontakt 52 zum Kontakt 56 die Richtung des Stromflusses durch die !Flügelschleifen 58 und 6.0 umgekehrt wird, so daß der Eingang und Ausgang der Station umgekehrt werden. Wie oben erwähnt, sind bei dieser besonderen Ausführungsform die Empfängerschleifen 24 und 28 mit der Senderschleife 26 in Bezug auf G-röße .identisch, wobei diese Schleifen mit der Schleife 26 bei 24 kc zusammen mit dem Oszillator 34 in der Resonanz abgestimmt werden müssen. Diese Abstimmung wird mit Hilfe von identischen Empfängertransformatoren 26 und 64 und Kondensatoren 66 und 68 erzielt. Hierbei ist jedoch zuTwo small single-turn wing loops 58 and 60 are connected together and have spaced apart contacts 52 and 56, as shown in Fig. 8, because they are arranged on the side wall 14 in a plane which is perpendicular to the planes through the loops 24, 26 and 28 are formed, Pig. 9 and 12. As in Pig. 2 As shown, the plucking loop 58 is closer to the receiver loop 24, while the plucking loop 60 is closer to the receiver loop 28 lies. The position of arm 46 with respect to contacts 52 and 56 determines the input and output of station 10, since simply moving arm 46 from contact 52 to contact 56 sets the direction of current flow is reversed by the! wing loops 58 and 6.0 so that the entrance and exit of the station are reversed. As mentioned above, the receiver loops 24 and 28 are with the transmitter loop 26 in this particular embodiment identical in terms of size, these loops with the Loop 26 at 24 kc along with the oscillator 34 in the Resonance must be coordinated. This tuning is carried out with the aid of identical receiver transformers 26 and 64 and capacitors 66 and 68 are achieved. Here, however, is to

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beachten, daß die Grundsätze der vorliegenden Erfindung auch dann verwirklicht werden können, wenn die Empfängerschleife nicht genau identisch mit den Senderschleifen oder genau parallel zueinander oder genau im gleichen Abstand voneinander an entgegengesetzten Seiten .der Senderschleife angeordnet sind. Unter diesen Umständen müßten jedoch kostspieligere bzw. kompliziertere Schaltungselemente zum Ausgleich dieser Abweichungen verwendet werden.note that the principles of the present invention also can then be realized if the receiver loop is not exactly identical to the transmitter loops or exactly arranged parallel to one another or at exactly the same distance from one another on opposite sides .der transmitter loop are. Under these circumstances, however, more expensive or complex circuit elements would have to be compensated these deviations are used.

Die Ausgangsspulen 61 und 65 der Transformatoren 62" und 65 sind miteinander verbunden, so daß die Energie aus jeder Empfängerschleife um 180° außer Phase zueinander ist· Auf diese Weise wird ein aus der Senderschleife empfangenes Signal gelöscht. Das Ausgangssignal der Station 10 wird durch diese Leitungen 70 und 72 geleitet, die mit dem Erdungsstreifen 74 und den Ausgangsspulen der Empfängertransformatoren 62 und 64 verbunden sind, wie gezeigt. Die Ausgangsleitungen sind mit einem geeigneten Spanmuigsdetektor 75, wie z.B. einem Deltaspannungsindikator, d.h. einem Messer für die Anzeige kleiner Veränderungen der Spannung, verbunden.The output coils 61 and 65 of the transformers 62 ″ and 65 are interconnected so that the energy from each receiver loop is 180 ° out of phase with each other · On in this way a signal received from the transmitter loop is deleted. The output of station 10 becomes passed through these leads 70 and 72 which connect to ground strip 74 and the output coils of the receiver transformers 62 and 64 are connected as shown. The output lines are with a suitable chipmuig detector 75, such as a delta tension indicator, i.e. a meter for displaying small changes in tension, tied together.

Sind die Schaltungen richtig verbunden und ist der Dreharm mit der Anschlußklemme 54 verbunden und befindet sieh kein Ziel in der Station 10, so ist zu diesem Zeitpunkt kein Ausgangssignal an den Leitungen 70 und 72 vorhanden»If the circuits are properly connected and the pivot arm is connected to terminal 54 and there is none If the destination is in station 10, there is no output signal at this point in time present on lines 70 and 72 »

Aus den Figuren 3, 5 und 6 ist ferner ersichtlich, daß die Welle 76 des Dreharmes 46 mit einer Rippe 78 verbunden ist, die aus einem nichteisenhaltigen Metall, wie z«B_# Aluminium oder Messing, hergestellt ist. Diese Hippe dreht sich mit lern Arm 46 aus Gründen, die nachfolgend beschrioben werden« Wie in Pig, 5 gezeigt, ist die Welle 76 so angeordnet, daß, wsnn sich der Dreharm 46 in der Prüfst ellung bei 54 befindet,From the figures 3, 5 and 6 can also be seen that the shaft 76 of the rotary arm 46 is connected to a rib 78, which is made of a non-ferrous metal such «B _# aluminum or brass. This Hippe rotates with learning arm 46 for reasons which will be shown below beschrioben "As shown in Pig, 5, the shaft 76 is arranged so that the rotary arm 46 in the wsnn RECOVERY are testing at 54 is located in,

309849/10U309849 / 10U

die Rippe ^-78 in gleichem Abstand von den Empfängerschleifen 24 tuid 28 liegt. Wie darüberhinaus gezeigt, "bewegt sich die Rippe 78 näher an den Empfängerschleifen 24 oder 28, wenn der Dreharm 46 bewegt wird, um mit den elektrischen Eontakten 52 oder 56 in Eingriff zu kommen.the rib ^ -78 equidistant from the receiver loops 24 tuid 28 lies. As also shown, "the moves Rib 78 closer to receiver loops 24 or 28 if the pivot arm 46 is moved to make contact with the electrical contacts 52 or 56 to engage.

Wie oben erwähnt, ist "dann, wenn kein Zielgegenstand in der Station vorhanden und der Arm 46 mit der Prüfanschlußklemme 54 verbunden ist, das Ausgangs signal an den Leitungen 70 und 72 gleich Null. Wie oben beschrieben, ist dies durch die Verwendung dreier identischer Schleifen möglich, wobei die beiden Empfängerschleifen 24 und 28 von der Senderschleife 26 im gleichen Abstand liegen und da der Ausgang der Empfängerschleifen 24 und 28 um 180° außer Phase zueinander gekoppelt ist, wie in Fig. 8 gezeigt. Diese Anordnung übt die Funktion von Sender- und Empfängersehleifen in der im Stand der Technik bekannten Quadratur aus* Da jedoch die Spulen 24, 26 und 28 sämtlich parallel und nicht in Quadratur zueinander sind, kann in diesem Fall die Station von elektromagnetischen Einflüssen abgeschirmt werden, welche außerhalb der Station auftreten. Es ist sehr wichtig, wenn die Metallsuchstation in Bereichen installiert werden soll, in welchen sich große Massen von Metall, wie z.B. Autobusse, Eisenbahnzüge, Flugzeuge oder Metalltüren um die.Station herum bewegen, da eine derartige Bewegung sonst das elektromagnetische Feld innerhalb der Station stören und ein Fehlersignal erzeugen würde. Diese Anordnung ist auch wirksam, um jede Störung des elektromagnetischen Feldes innerhalb der Station zu verhindern, welche durch die Angestellten der Anstalt verursacht wird, die in der Station oder um die Station herumgehen und Metallgegenstände oder Werkzeuge tragen. Bei der oben beschriebenen Abschirmung haben solche Bewegungen außerhalb der Station wenig Wirkung auf die Station und führen nichtAs mentioned above, if there is no target in the station, then the arm 46 is with the test connector 54 is connected, the output signal on lines 70 and 72 equals zero. As described above, this is possible by using three identical loops, with the two receiver loops 24 and 28 are at the same distance from the transmitter loop 26 and there is the output of the receiver loops 24 and 28 coupled 180 ° out of phase with one another is as shown in FIG. This arrangement exercises the function of transmitter and receiver loops in the stand known from the art of quadrature * Since, however, the coils 24, 26 and 28 are all parallel and not in quadrature to each other, in this case the station can be electromagnetic Influences that occur outside the station are shielded. It is very important when the metal detector to be installed in areas in which there are large masses of metal, such as buses, trains, Move planes or metal doors around the station, since such a movement would otherwise disturb the electromagnetic field within the station and generate an error signal would. This arrangement is also effective in preventing any disturbance of the electromagnetic field inside the station, which is caused by the staff of the institution walking in or around the station and Carry metal objects or tools. With the shielding described above, such movements have outside the station has little effect on the station and does not perform

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zur Erzeugung eines wahrnehmbaren Ausgangssignals in den Leitungen 70 und 72, wie es sonst der Pail sein würde, wenn die Hauptsender- und Empfängerschleifen oder Spulen in der Station in Quadratur angeordnet wären.to generate a perceptible output signal in the Lines 70 and 72 as otherwise the pail would be if the main transmitter and receiver loops or coils in the Station would be arranged in quadrature.

Die bestimmte Anordnung der Spulen 24, 26 und 28 hat jedoch gewisse Nachteile, die in den Pig, 9 und 10 dargestellt sind. Bewegt sich ein metallisches Ziel 80 durch die Station und ist das Metallziel eine von einer Person getragene Feuerwaffe*, so meiden die leitungen 70 und 72 die m-förmige Spannungswelle, wie in Fig. 10 gezeigt. Diese Anordnung ist unerwünscht, da sie stets den Eindruck erwecken würde, daß zwei Ziele sich durch die Station hindurch "bewegen. Falls nämlich eine Person eine große Gürtelschnalle vorne und eine Feuerwaffe in einer Hintertasche trägt, so wird die Wirkung auf die Ausgangssignale der Station im wesentlichen die seihe, wie wenn eine Person eine Gürtelschnalle, jedoch keine Feuerwaffe hätte, wodurch es einer solchen Person ermöglicht ' wird, die Bedienungsperson der Metallsuchstation zu täuschen.However, the particular arrangement of the coils 24, 26 and 28 has certain disadvantages illustrated in Figures 9 and 10. If a metal target 80 moves through the station and the metal target is a firearm * carried by a person, thus the lines 70 and 72 avoid the m-shaped voltage wave, as shown in FIG. This arrangement is undesirable since it would always give the impression that two targets were moving through the station ". If namely, if a person carries a large belt buckle in the front and a firearm in a back pocket, the effect will be on the output signals of the station essentially see as if a person had a belt buckle but not a firearm, thus making it possible for such a person 'will deceive the operator of the metal detection station.

Um die unerwünschten Merkmale der in Pig* 10 gezeigten m-förmigen Spannungskurve zu beseitigen, sind die Flugelschleifen 58 und 60 vorgesehen. Wie in Fig. 1 und Fig. 3 gezeigt, sind diese Flügelschleifen auf einer Stütze oder Unterlage 82 befestigt, welche auf der Seitenwand 14 abnehmbar angeordnet ist. Da bei abgestimmten Schaltungen die Ausgangsströme um 90 in Bezug auf die Spannung phasenverschoben sind, hat die in Fig, 8 gezeigte elektrische Verbindung, worin der Abgriff 39 bei Transformator 38 durch den Drehschalter mit den Flügelschleifenkontakten 52 oder 56 verbunden ist, die Wirkung einer Zufuhr von Strom zu den Flügelschleifen, die um 90° von dem Strom in der Senderschleife 26 verschoben sind.To avoid the undesirable features of the m-shaped shown in Pig * 10 To eliminate the tension curve are the Flugel loops 58 and 60 provided. As shown in Fig. 1 and Fig. 3, these wing loops are attached to a support or pad 82, which is detachably arranged on the side wall 14. Since with coordinated circuits the output currents change 90 are out of phase with the voltage, the electrical connection shown in Fig. 8, wherein the tap 39 in transformer 38 is connected to the wing loop contacts 52 or 56 by the rotary switch, the effect of a Supply of current to the wing loops which are shifted 90 ° from the current in the transmitter loop 26.

3098-49/ 1 OU3098-49 / 1 OU

Bezugnehmend nun auf Pig· 9, besteht dann, wenn sich das eisenhaltige oder nichteisenhaltige Metallziel 80 in der Station 10 zwischen den Spulen 24 und 26, wie gezeigt, bewegt, ein maximales Ankuppeln von Energie an der benachbarten Empfängerschleife 24. Die Flügelschleife 58 mit ihrem Stromnacheilen um 90° hinter dem Strom in einer Sen-, dersehleife 26 erzeugt jedoch ein elektromagnetisches Feld, welche mit der Eintrittsempfängerschleife entgegengesetzt zur Energie gekoppelt wird, die aus der Senderschleife 26 auf die Empfängerschleife 24 übertragen ist, so daß ein anfänglicher Spannungsabfall in dem Ausgang der Empfängerschleifen24 und 28 Torliegt· Dieser Abfall wird jedoch ausgeglichen, wenn sich das Ziel durch die Schleife 26 zur Empfängerschleife 28 bewegt, welche, wie oben erwähnt, um 180° zur Schleife 24 phasenverschoben ist, so daß in diesem Fall kein Zuwachs der Energie in der Empfängerschleife 28 vorliegt. Infolgedessen wird die in Fig· 10 gezeigte unerwünschte m-förmige Spannungswelle durch die Flügelschleifen in die in Fig, 11 gezeigte normale Diskriminatorspannungskurve geändert· Diese Kurve weist eine größere Veränderung der Amplitude, wodurch die Empfindlichkeit der Station, wesentlich erhöht wird und darüber hinaus die oben beschriebenen Probleme beseitigt sind, welche durch die in Fig. 10 gezeigte m-förmige Kurve verursacht werden,Referring now to Pig 9, if the ferrous or non-ferrous metal target 80 is in FIG Station 10 moves between coils 24 and 26 as shown, maximum coupling of energy to the adjacent one Receiver loop 24. The wing loop 58 with its current lag by 90 ° behind the current in a transmitter, The loop 26, however, creates an electromagnetic field which is opposite to the ingress receiver loop is coupled to the energy that is transmitted from the transmitter loop 26 to the receiver loop 24, so that a initial voltage drop in the output of the receiver loops 24 and 28 goal. However, this drop is compensated for when the goal passes through loop 26 to the Moved receiver loop 28, which, as mentioned above, is 180 ° out of phase with the loop 24, so that in this Fall no increase in energy in the receiver loop 28 is present. As a result, that shown in Fig. 10 becomes unwanted m-shaped voltage wave through the wing loops into the normal discriminator voltage curve shown in Fig. 11 changed · This curve exhibits a greater change in amplitude, reducing the sensitivity of the Station, is significantly increased and, moreover, the problems described above have been eliminated, which are caused by the in Fig. 10 caused the m-shaped curve shown,

Zusammenfassend ist hierbei zu beachten, daß die Flügelschleifen 58 und 60 die folgenden Funktionen haben, nämlich indem sie Strom zum Oszillator führen, bilden sie einen Stromfluß um 90° phasenverschoben zur Senderschleife 26, wobei sie das Ausgangssignal der Station in eine normale Diskriminatorkurve verwandeln, wenn sich ein Ziel durch die Station bewegt.In summary, it should be noted here that the wing loops 58 and 60 have the following functions, namely by supplying electricity to the oscillator, they form one Current flow 90 ° out of phase with the transmitter loop 26, converting the output of the station into a normal Transform discriminator curve when a target moves through the station.

-30 98 4 9/1OU-30 98 4 9 / 1OU

-H--H-

Die Wirkung der Rippe 78, wenn der Schalter 48 so eingestellt ist, daß der Arm 46 mit den Kontakten 52 oder 56 in Anlage kommt, "besteht darin, eine festgelegte "Vorspannung in die Empfängerschleifen oder ein künstliches Ziel in der Station einzuführen, so daß am Spannungsdetektor 75- stets ein wesentlicher Ausgang vorhanden ist. Dies ist nützlich, da die Bedienungsperson kleine Abweichungen oder Schwankungen in dem Spannungsdetektor 75 um Null herum nicht interpretieren muß, welche entweder oder negativ sein können. Statt dessen könnte die Bedienungsperson "bei dieser 'Anordnung einen Spannungsdetektor verwenden, der nur die Veränderungen der Spannung mißt, wobei dann kein Problem bestehen würde, welche durch Veränderungen der Richtung des Stromflusses durch den Spannungsdetektor verursacht werden. The action of the rib 78 when the switch 48 is set so that the arm 46 with the contacts 52 or 56 in abutment comes, "is to put a set" bias into the To introduce receiver loops or an artificial target in the station so that there is always an essential one on the voltage detector 75- Output is present. This is useful as the operator can see small variations or fluctuations in the Voltage detector 75 need not interpret around zero, which can be either negative or negative. Instead, could the operator "in this' arrangement use a voltage detector that only the changes in voltage measures, in which case there would be no problem caused by changes in the direction of the current flow through the voltage detector.

Während sich ein Ziel durch die Station bewegt, führt sie eine Spannung und einen Phasenwechsel in das Ausgangssignal in der Leitung 70 und 72 ein, wobei es denkbar ist, daß ein Ziel eine 3?orm haben könnte, welche eine Spannung mit einer Phase erzeugen könnte, welche genau entgegengesetzt der Spannung und der Phase ist, die durch die Senderschleife auf die Empfängerschleifen übertragen sind. In einem solchen Pail ist kein Signal in den Ausgangsleitungen 70 und 72 vorhanden, wobei die Bedienungsperson in der Station getäuscht werden könnte. Die Funktion bzw. Aufgabe der Rippe 78 zusätzlich zur Einführung der festgelegten Vorspannung in die Anlage besteht auch darin, einen Zustand in die Metallsuchstation einzuführen,, so daß keine leiblich wahrscheinliche Zielform eine Phasenverschiebung >und eine Spannungsveränderung verursachen kann, welche die Spannung in der Sender- und Empfängerschleife verschieben könnte, wodurch die Bedienungsperson in der Station getäuscht werden würde.As a target moves through the station, it introduces a voltage and phase change into the output signal on line 70 and 72, it is conceivable that a target could have a 3? form, which would have a voltage with a Phase which is exactly opposite to the voltage and phase applied by the transmitter loop to the Receiver loops are transmitted. In such a pail there is no signal on output lines 70 and 72, the operator in the station could be deceived. The function or task of the rib 78 in addition to introduce the specified preload into the system also consists in introducing a state into the metal detection station, so that no physically probable target shape cause a phase shift> and a voltage change which could shift the voltage in the transmitter and receiver loops, causing the operator in the Station would be fooled.

309 84 9/1 OU309 84 9/1 OU

Bisher wurde die Metallsuchstation als eine tragbare Me.tallsuchstation zur Auffindung eisenhaltiger oder nichteisenhaltiger Metallgegenstände dargestellt, welche zum Auffinden versteckter eisenhaltiger oder nichteisenhaltiger Gegenstände ■verwendet wird, die von einer Person getragen werden, welche in einen kontrollierten oder überwachten Bereich eintreten. Wie jedoch in Pig. 7 gezeigt, könnte die Suchstation auch zum Auffinden versteckter eisenhaltiger oder nichteisenhaltiger Metallgegenstände im G-epäch verwendet werden, welche normalerweise solche Metallgegenstände nicht enthalten, wie z.B. mit Korn, Sand gefüllte Säcke oder Briefe in Postsäeken.So far, the metal search station has been used as a portable metal search station to find ferrous or non-ferrous metal objects shown, which to find hidden ferrous or non-ferrous objects that are ■ carried by a person who Enter a controlled or monitored area. As in Pig. 7, the search station could also to find hidden ferrous or non-ferrous metal objects in the G-epäch which usually does not contain such metal objects as sacks filled with grain, sand or letters in mail sacks.

Die Tragbarkeit bzw. Bewegbarkeit der Metallsuchstation führt ein Problem ein, welches darin besteht, daß nachdem die Station installiert und das elektromagnetische leid innerhalb der Station richtig eingestellt worden ist, gelegentliche Bewegung großer Massen von Metall, "wie z.B. dann, wenn Angestellte der Anstalt dauernd große Metallkasten oder Metall» werkzeuge schieben oder Metallgegenstand.« um den Eintritt oder Austritt dieser Station herum umordnen, das elektromagnetische Feld innerhalb der Station trotz der Abschirmung beeinträchtigen kann. Zum Ausgleich ist die Station mit einer auf der Stütze 82 befestigten verstellbaren Metallplatte 81 versehen. Diese Platte 81 ist aus einem nichteisenhaltigen Metallmaterial hergestellt, wobei sie, wie gezeigt, auf der Stütze 82 in Ebenen bewegbar ist, welche zur Ebene der Rippe 78 parallel verlaufen. Infolgedessen kann jede Störung des elektromagnetischen Feldes, die durch das Anbringen eines großen ortsfesten Metallgegenstandes in der Nähe des Eingangs oder Ausgangs der Station verursacht wird, durch die Verstellung der Metallplatte 81, wie in Hg. 3 gezeigt, ausgeglichen werden.The portability or mobility of the metal search station introduces a problem which is that after the station is installed and the electromagnetic suffered within the station has been properly set up, occasional movement of large masses of metal, "such as when clerks the institution constantly large metal boxes or metal "pushing tools or metal objects" around the entrance or rearrange the exit of this station, the electromagnetic field inside the station despite the shielding can affect. To compensate for this, the station is provided with an adjustable metal plate 81 fastened on the support 82 Mistake. This plate 81 is made of a nonferrous one Metal material being made movable, as shown, on the support 82 in planes which are to the plane of the rib 78 run parallel. As a result, any disturbance of the electromagnetic field caused by the attachment of a large stationary metal object near the entrance or exit of the station is caused by the adjustment of the metal plate 81 as shown in Fig. 3 can be balanced.

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Obwohl die in den Pig. 1 und 7 dargestellte Suchstation als tragbare Suchstation gezeigt ist und eine Oberwand, eine Bodenwand und Seitenwände aufweist, können ferner die Grundsätze der vorliegenden Erfindung auch anhand von nichttragbaren Äusführungsformen verwirklicht werden, wie ζ „33. dann, wenn die Sender- und Empfängerschleifen in den Wänden, Decken und Böden vorhandener Konstruktionen installiert sind.Though the ones in the Pig. 1 and 7 shown search station as portable search station is shown and a top wall, a bottom wall and side walls, the principles of the present invention can also be applied to non-portable Embodiments are realized, such as ζ “33. then, when the transmitter and receiver loops are installed in the walls, ceilings and floors of existing structures.

Obwohl die Erfindung, wie oben beschrieben, auf eine Einrich- · tung zur Auffindung der Bewegung versteckter eisenhaltiger oder nichteisenhaltiger Metallgegenstände gerichtet wurde, welche sich durch eine Suchstation bewegen, können selbstverständlichdie Grundsätze der vorliegenden Erfindung zur Peststellung der Abwesenheit von Metallgegenständen in Stellen angewendet werden, in welchen das Vorhandensein von Metall angenommen wird.Although the invention, as described above, relates to a device for locating the movement of hidden ferrous or non-ferrous metal objects have been judged, moving through a search station can of course use the Principles of the present invention for establishing the absence of metal objects in locations may be used in which the presence of metal is assumed.

Hergestellte Teile können beispielsweise hauptsächlich aus nichtmetallischen Materialien hergestellt sein, wobei sie jedoch immer noch einige versteckte Metallteile darin enthalten. Unter solchen Umständen könnte die oben beschriebene Metallsuchstation als eine Station zur Prüfung des Teiles funktionieren, um sicherzustellen, daß sämtliche Metallteile enthalten sind·, da die völlige Abwesenheit des Metallteils durch die Abwesenheit eines Ansprechens im Detektor 75 angezeigt sein würde.Manufactured parts may, for example, be made primarily of non-metallic materials, with them however, it still contains some hidden metal parts. In such circumstances, the above described Metal search station as a station to inspect the part work to ensure that all metal parts are included · since the total absence of the metal part would be indicated by the absence of a response in detector 75.

Die Packungen, welche durch die Station gehen, können ferner ein wertvolles Metall einer gewissen Größe und Porm enthalt ten. Palls eine wesentliche Menge des Metalls fehlen würde, so würde die Abwesenheit oder die verminderte Menge im Detektor 75 angezeigt werden. Dies würde nur erfordern, daß der Detektor oder Indikator 75 entsprechend der Menge des MetallsThe packages which go through the station may also contain a valuable metal of some size and shape ten. Palls would be missing a substantial amount of the metal, thus the absence or the decreased amount would be indicated in the detector 75. This would only require the detector or indicator 75 according to the amount of metal

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in dem zu prüfenden Gegenstand geeicht sein muß· Durch Ablesen des Indikators oder Anzeigers kann auf diese Weise die Bedienungsperson entweder die Abwesenheit des Metalls oder das Ausmaß der Veränderung der Menge des Metalls bestimmen, welche in dem Gegenstand vorhanden sein müßte·must be calibrated in the object to be tested · By reading of the indicator or indicator can in this way the operator either the absence of the metal or determine the extent of the change in the amount of metal that should be present in the object

309849/1014309849/1014

Claims

Metal search station to find τοη ferrous or non-ferrous metallic targets, "characterized by an inner part and at least a wall, detector means, for locating the movement of targets passing through the station "move, and through a shielding device on at least one wall of the station to shield the interior of the station from electromagnetic influences, caused by ferrous or non-ferrous metal objects placed next to the screened Move the wall outside the station.

2. Metal detection station for ferrous or non-ferrous Metal targets, characterized by an interior space and at least one wall, a detector or search device, assigned to the station to control the movements of ferrous or non-ferrous targets determine which are moving through the station and by shielding means on at least one Wall of the station for shielding the interior of the station from electromagnetic influences caused by ferrous or non-ferrous metal objects which move on the shielded wall outside the station, this shielding device not having a layer of a ferrous metal sheet which covers at least a substantial part of the shielded wall of the station, as well as a device, which holds the metal sheet made of ferrous material firmly to the wall.

3098AS / 10U

3. Metal search station according to claim. 2, characterized by means associated with the search station to compensate the station for presence fixed ferrous or non-ferrous metallic To achieve objects next to the entrance or exit of the station "

4 · Metal detection station for ferrous or non-ferrous metallic targets, characterized by a search device which is assigned to the station in order to detect the movement to determine the targets by the station, wherein the search device has a transmitter coil and at least one receiver coil and the transmitter coils are spaced apart and generally parallel to each other, and by means in the station connected to the coils for causing the output the receiver coil is close to zero, unless it is a ferrous or non-ferrous metallic Item moved through the station *

5. Metal search station according to claim 4, characterized in that that the station has at least one wall, one shielding device on at least one wall of the station to shield the interior of the station against electromagnetic

. Influences caused by at least non-ferrous metallic Objects that move on the shielded wall outside the station.

6. metal search station according to claim 5, characterized in that the shielding device is a layer of one has ferrous metal sheet which covers at least a substantial part of said wall in the station, and by means for holding the ferrous sheet rigidly on said wall.

3 0 9 8 A 97 10U

7. metal search station according to claim 4, characterized in that that the transmitter and receiver coils are provided in the station and arranged so that the station moving targets must pass through these coils.

8. metal search station according to claim 7, characterized in that both the transmitter and receiver coils single-winding wire loops are.

9. Metal search station for ferrous or non-ferrous metallic objects, characterized by a search device in the station for locating the movement of ferrous or non-ferrous metallic targets by the station, the search device comprising a transmitter coil and two receiver coils in the station and the transmitter coil and the receiver coils are generally spaced apart and parallel to each other and so arranged are targets moving through the station must pass through the coils, a device in the station being connected to the coils in order to cause the output of the receiver coils in general is zero unless a ferrous or non-ferrous metal target passes through the station .

10. Metal search station according to claim 9, characterized in that that the station has an interior and at least one wall and a device for shielding the interior of the Station of electromagnetic influences caused by ferrous or non-ferrous metallic objects which move past the shielded wall outside the station.

309849 / 10U

11o metal stop after claim. 10, characterized, that the said separating device is a ferrous Sheet metal, which has at least one essential rope the said wall of the station, and by means of a device which holds the ferrous sheet rigidly to the said wall,

12. Metal search station for ferrous or non-ferrous metallic targets, characterized by a search device in the station to detect the movement of ferrous or non-ferrous metallic targets through the station, said search means comprising a transmitter coil and two receiver coils spaced from each other and are generally parallel to each other and all coils are generally larger and of identical shape in relation to each other, and wherein said receiver coils are equidistant. from the transmitter coil and opposite sides thereof and all coils are arranged so that targets moving through the station pass through said coils and rewind said receptacles are connected to each other in such a way that a signal they receive from the transmitter coil is canceled, it unless a ferrous or non-ferrous metallic target passes through the station.

13 Metal search station according to claim 12, characterized in that that the station has an interior space and at least one wall, as well as a device on at least one wall of the station for shielding the interior of the station from electromagnetic Has influences caused by ferrous or non-ferrous metallic objects, which past the shielded wall outside the station move·

309849 / 10U

14. Metal search station according to claim. 13, characterized in that that the "said shielding device is a ferrous one Sheet metal covering at least a substantial portion of the wall of said station, including means is provided, which the ferrous sheet rigidly to the said wall.

15. Metal viewing station according to claim 12, characterized in that that said coils are all single winding loops, which are larger in relation to each other and are identical in shape and matched are to transmit and receive the same frequency, the receiver coils in such a way connected to each other are that their outcomes cancel each other out, unless a ferrous or non-ferrous one Moved metal target through the station.

16 · Metal viewing station for ferrous or non-ferrous Metal targets, indicated by a. Search device in the station for locating the movements of the said targets through the station, said search means having a single coil transmitter loop and two single coil receiver loops having spaced apart and generally parallel on each side of the transmitter loop are arranged to one another, an oscillator, which is assigned to said station, and a transformer, wherein the secondary coil of the transformer is connected to the transmitter loop and both for determining the Frequency of the oscillator as well as to match the impedance of the oscillator to the impedance of the single winding transmitter loop, which enables the Transmitter loop is formed from a single winding of wire, by means of a device that connects to the receiver loops is connected to the recipient loops with

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to match the frequency of the transmitter loop, with the Receiver loops in opposite phase are connected to each other, so that a received from the transmitter loop Signal is cleared unless there is a ferrous or non-ferrous metallic target moved through the metal detection station, and through a voltage detector device, which is assigned to the station and can be connected to the receiver loops to determine the presence indicate ferrous or non-ferrous metal targets moving through the station

17. Metal search station for ferrous or non-ferrous metallic targets, characterized by a search device in the station for locating the movement of said Targets by the station, this searcher having a single winding transmitter loop and two single winding receiver loops having spaced generally parallel on each side of the transmitter loop are arranged to each other, an Ossiilator, which is assigned to the station, this oscillator one Has transformer connected to the secondary coil of the oscillator with the transmitter loop and both for determining the frequency of the oscillator as well as to adapt the impedance of the oscillator to the impedance of the single winding The transmitter loop is used, thereby enabling the transmitter loop to be formed from a single winding of wire is a device connected to the receiver loops is to tune the receiver soles to the frequency of the Tuning transmitter loop, this facility being receiver transformers for each of the receiver loops and the secondary coils of the receiver transformers are interconnected so that the energy from each receiver loop is 180 ° out of phase with one another,

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so that a signal received from the transmitter loop in the secondary coils, unless a ferrous or non-ferrous metal target passes through the station moves, as well as by a voltage detector device connected to the secondary coils of the receiver transformers tied together. can be-to the presence of ferruginous or non-ferrous metal targets moving through the station.

18. Metal search station according to claim 17, characterized by a device through which the individual winding loops be held rigidly in position in the station.

19 »Metal search station according to claim 18, characterized in that the means by which the individual winding loops are rigidly held in position comprises strips which are formed from a suitable insulating material and are rigidly fastened in the station, with grooves for receiving the wires in said Strips are formed and the single-turn wire loops are fastened in the wire receiving grooves in the said strips _o

20 «metal search station according to claim 17, characterized in that that the station has walls which form or delimit the interior of the station, with a shielding device on at least one wall of the station to shield the interior of the station from electromagnetic influences is provided which are caused by ferrous or non-ferrous metal objects that adhere to move past the screened wall outside the station.

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21. Metal detection station for. Claim. 20, characterized by, a device which the metal detection station to compensate the metal detection station for the presence of massive fixed ferrous or non-ferrous metallic Objects near the entrance or exit of the station assigned"

22. Metalsuchstatibn for ferrous or non-ferrous metallic targets, characterized by a search device in the station for locating the movement of targets through the station, this facility being three in general has identical single-winding wire loops, which are arranged in the station in such a way that targets moving through the station pass through these three Wire loops go through it and one Drant loop is a transmitter loop, while the other two wire loops are arranged on each side of the transmitter loop and serving as input and output receiver loops, an oscillator associated with the station, wherein this oscillator has a transformer and the secondary coil of the transformer with the transmitter loop is connected and both for determining the frequency of the oscillator and for matching the impedance of the oscillator to the impedance of the single-winding transmitter loop, which enables the transmitter loop to consist of a single winding of wire, a device connected to the receiver loops, to tune the receiver loops to the frequency of the transmitter loop, this device being receiver transformers which are connected to each of the receiver loops and the secondary coils of the Receiver transformers are connected to each other, so that the energy from each receiver loop is increased by 180 is out of phase with each other, so that a

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The signal received in the loop is deleted from the transmitter loops unless a ferrous or non-ferrous metallic "target moves through the station", and by voltage detector means connected to the secondary coils of the receiver transformers can be used to indicate the movement of ferrous or non-ferrous metallic targets that are moving move through the station ".

23. Metal detection station according to claim 22, characterized in that the wire loops are all generally parallel to one another and that "said station has walls which delimit the interior of the station, with a screen installation on at least one wall, the station is intended to shield the interior of the station from electromagnetic influences caused by ferrous or non-ferrous metallic objects, which pass the shielded wall outside move the station,

24. Metal search station according to claim 23, characterized in that that the shielding device comprises a ferrous metal sheet, which at least a substantial part the wall of the station is covered and that a device is provided by which the ferrous sheet is rigidly attached the said wall is held.

25. Metal search station according to claim 22, characterized by a device for changing the voltage output of the Secondary coils of the receiver transformers in the form of a discriminator curve, if there is a ferrous or non-ferrous metallic target moved through the station.

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26. Metal search station according to claim 25, characterized in that that the changing device has at least one wire wing loop disposed in a plane generally perpendicular to the plane of the transmitter and receiver loops runs, with a device connected to the! wing loop in order to power the plucking loop supply that is 90 ° out of phase with the voltage supplied to the transmitter loop so that, when a ferrous or non-ferrous metal target moves through the station, the current in the plucking loop generates a PeId, which is coupled to the input receiver loop opposite to the energy, which from the transmitter loop to the input receiver loop is transmitted, and then increases the energy that is transferred from the transmitter loop to the output receiver loop is transmitted to a discriminatoraiisgaaigssspannung in the secondary coils of the receiver transformers to create.

27. Metal search station according to claim 26, characterized by means for introducing a controlled phase shift into the tension of the receiver loops, so that no physically probable target form a tension in can introduce the receiver loops, which has a phase that determines the voltage and phase in the receiver loops can shift which are transmitted from the transmitter loop, thereby deceiving the operator could be.

28. Metal search station according to claim 27, characterized in that the device for introducing a controlled phase shift into the tension in the receiver loop

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Piece of a non-ferrous metal that is closer is located on the input receiver loop of the station than at the output receiver station.

29 * metal search station according to claim 25, characterized in that that the change "or, modification device for modifying the voltage output of the secondary coils of the Receiver transformers on the Porm of a discriminator curve has two single wire wing loops, which in one Plane are arranged which is generally perpendicular to the planes of the transmitter and receiver loops, wherein one end of each plucking loop has terminals and a three-position rotary switch has a rotary arm which from the oscillator with one or the other of the terminal of the wing loops or with a terminal in connected to the test position of the terminal so that the direction of current flow through the ball loops in Depending on the malfunction of the rotary arm of the three-position switch can be reversed, with the wing loops are arranged so that one wing loop is closer to a receiver loop and the other wing loop closer to it the other wing loop lies so that by movement of the rotary arm in the direction of one or the other connection terminal of the ball loops of the input and the output the metal detector can be reversed.

30. Metal search station according to claim 29, characterized by a device for introducing a controlled phase shift into the tension of the receiver loops, so that no physically probable target configuration a tension into the receiver loops which could shift the tension in the receiver soles that are transmitted out of the transmitter loop, whereby the operator could be deceived, said

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Establishment of a rib made of a non-ferrous sheet metal and said rib connected to the shaft of the rotary arm of the rotary position switch and in the direction on one or the other receiver loop as the case may be is movable, with which terminal the rotary arm comes into engagement, the test terminal of the rotary switch in With respect to the transmitter and receiver coils is arranged so that when the rotary arm is connected to the test terminal, the Non-ferrous metal rib equidistant from between the two receiver loops so that if no target passes through the station, the output of the secondary coils is insignificant.

31. Metal detection station for ferrous or non-ferrous metallic targets, characterized by a support structure, the support structure delimiting a passage or forms, which has side walls, by a search device, which in the walls of the support structure for Finding the movement of the targets through the support structure is attached, this search device three identical Has single-winding wire loops that are rigidly attached to the side walls of the support structure and said wire loops at a distance from each other and parallel are arranged in relation to each other and in planes which are perpendicular to the passage through the supporting structure, so that targets moving through the support structure pass through the three single-winding wire loops, whereby one wire loop touches a transmitter loop and the other two wire loops as input and output receiver loops serve, by an oscillator, which is assigned to the station and has a transformer, where the secondary coil of the transformer is connected to the transmitter loop is connected and both for determining the frequency of the oscillator and for matching the impedance

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of the oscillator to the impedance of the individual weighing transmitter loop serves, thereby enabling the transmitter loop to be formed from a single winding of wire with the receiver loops on each side of the transmitter loop equidistant therefrom and a device is connected to the receiver loops j um- the receiver loops to the! frequency of the Tune transmitter loop and said device comprises receiver transformers connected to each of the receiver loops are connected, the secondary coils of the receiver transformers being interconnected, so that the energy from each receiver loop is shifted by 180 ° to each other, so that a signal from the transmitter loop, that is transferred to the receiver loop is deleted in the secondary loops of the receiver transformers unless a ferrous or non-ferrous metal target moves through the station, and by a voltage detector device, which with The secondary coils of the receiver transformers can be connected to the movement of ferrous or non-ferrous Display metal targets through the support structure of the station.

52. metal search station according to claim 31, characterized in that that at least one wall of the support structure is provided with a layer of ferrous metal sheet, which is rigidly attached to it and at least one essential Rope covering the wall in order to shield the interior of the supporting structure from electromagnetic influences, caused by ferrous or non-ferrous metal targets clinging to the screened Move wall past outside the station.

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33. Metal search station according to claim 31, characterized by a device for modifying the voltage output of the secondary coils of the receiver transforms format or en in the form of a discriminator curve, if there is a ferrous or non-ferrous metallic target moved through the station ".

34. Metal search station according to claim 33, characterized in that the modification device has at least one wire wing loop arranged in a wall of said station in a plane which is generally all of to the levels of the transmitter and receiver loops, with a device being connected to the plucking platform, to provide the wing loop with a current that is 90 ° out of phase with the voltage, soft is delivered to the transmitter loop so that when there is a ferrous or non-ferrous metal target duroh the station is moved, the current in the paddle loop generates an EeId, which is sent to the input receiver loop coupling of opposite energy that is transferred from the transmitter loop to the input receiver loop, and increases the energy transferred from the transmitter loop to the output receiver loop by one Discriminator output voltage curve on the secondary coils to form the receiver transformers.

35. Metal search station according to claim 34, characterized by a device for introducing a controlled phase shift into the tension of the receiver loops, so that there is no reasonably probable target configuration Can introduce voltage into the receiver loop, which would create a voltage that reduces the voltage in the Could shift receiver loops, which from the

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the loop is transmitted, whereby the operator can be deceived.

36. Metal viewing station according to claim 35, characterized in that that the means for introducing a controlled phase shift in the voltage and ~ the receiver loop Piece of non-ferrous sheet metal which is closer to a station's input receiver loop than to the station's output receiver loop.

37ο metal search station according to claim 31, characterized bya device for modifying the voltage output the secondary coils of the receiver transformer in the form of a discriminator curve, if there is a ferrous or moving non-ferrous metallic target through the station, said means having two single wire wing loops arranged in a plane which is generally perpendicular to the planes of the transmitters and Receiver loops and one end of each wing loop has terminals, through a three-position rotary switch, which has a rotating arm, the one from the oscillator with one or the other clamp of the sole plate of the grand piano or connected to a test terminal position so that the direction of current flow through the wing loops can be reversed depending on the position of the rotary arm of the three-position switch, wherein the wing loops are arranged so that one wing loop is closer to a receiver sole and the other wing loop is closer to the other receiver loop, so that by moving the rotating arm in Direction to one or the other terminal of the wing loop the input and the output of the metal detection station can be reversed.

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38. Metal search station according to claim 37 »characterized by a device for introducing a controlled phase shift into the tension of the receiver loop, so that there is no reasonably probable target configuration Introduce voltage into the receiver loops which could shift the voltage in the receiver loops, which is transmitted from the transmitter loop, ^ whereby the operator could be fooled, said device being a rib made of non-ferrous sheet metal and said rib connected to the shaft of the rotary arm of the three-position switch and in the direction of one or the other receiver loop can be moved as the case may be is the connection terminal with which the rotary arm is in handle comes, the test terminal of the rotary switch is arranged in relation to the transmitter and receiver coils in such a way that that when the rotary arm is connected to the test clamp, the non-ferrous metal rib is equidistant from the two receiver loops so that, if no target is moved through the station, the output of the secondary coils is negligible «

39 Metal search station according to Claim 1, characterized in that that the metal detection station is portable and from one location can be moved to another for installation.

40. metal search station according to claim 31, characterized in that the support structure is portable, so that the metal search station can be moved from one position to another in an installation.

41 Metal search station according to Claim 40, characterized in that that the support structure 'has a bottom wall, side walls and. has a top wall which is rigidly connected to one another

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are, with a ferrous metal sheet on the bottom wall, the side walls and the top wall of the support structure is attached to the interior of the support structure of to shield against electromagnetic influences caused by the movement of ferrous or non-ferrous objects outside the station.

42, Appendix for determining either the absence or the Change in the amount of ferrous or non-ferrous metal in an object, characterized by a support structure with an interior space, this support structure having at least one wall and one Device in the interior of the station to determine the movement of ferrous or non-ferrous objects is provided, which is through'die station move, the search means having an indicator related to the amount of metal in the object to be tested is calibrated and at least one wall of the support structure is provided with a shield is about ferrous or non-ferrous metal targets, moving past the said wall outside the station to prevent the electromagnetic field influence within the station and thus introduce an error in the display scale «

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