EP2166894B1 - Magnetic closure with an opening-assisting spring - Google Patents

Abstract

A magnetic closure comprises a magnet-armature structure having a magnet and an armature, the magnet and the armature being constituted such that, for an automatic closing, the armature and the magnet mutually attract each other in a closing direction below a predetermined minimum distance, and, for an opening, the magnet is laterally shifted or rotated with respect to the armature into an open position so that the surfaces of magnet and armature facing each other in a mutually attracting manner become smaller, whereby the force of attraction between magnet and armature comes smaller, Further, an opening-assisting spring is provided for assisting the opening, wherein the opening-assisting spring either is automatically pretensioned by the magnetic force during the automatic closing, or is pretensioned during the opening operation.

Description

The invention relates to a magnetic closure that connects flexible or solid elements together, such. B. a closure on a handbag.

Magnetic closures are known from the prior art, which attract each other when closing, but rotated to open against each other or moved. These closures have the advantage that they can be opened softer than if the closure had to be pulled apart in the same direction in which it contracts when closing. Such a magnetic shutter is in the document DE 196 42 071 A1 described. In this construction, the armature is completely pushed off the magnet during the opening movement, so that closures of this type can be opened almost force-free.

Often, however, such closures have no optimal feel, with the feel being understood as the property of how a closure when opening but also when closing feels when it is operated by hand. The reason for this lack of feel is the fact that the complete separation of the closure halves usually still a balance of the magnetic force must be overcome, so that a jerky feel, because in contrast to the construction of the DE 196 42 071 A1 is not always sufficient displacement available to move armature and magnet as far sideways until the magnetic force acting between armature and magnet is almost zero. Therefore, the last opening movement must be opposite to the closing movement.

To remedy this deficiency, magnetic closures are known from the prior art, which operate on the principle of verpolbaren magnetic systems. By twisting or shifting the magnet systems against each other, d. H. in carrying out the opening movement, the magnet systems are brought into a repulsive opposite position. This comfortably supports the opening of the closure and significantly improves the feel. However, these closures are expensive to produce, since a variety of magnets is needed or consuming multi-pole magnetizations of the magnets.

An improvement in the feel when closing a magnetic closure is in the document DE3631092 described. Here, a spring is provided, which is arranged between armature and magnet and generates a force opposing the magnetic field after closure in order to reduce the impact sound when closing. Despite the advantage achieved when closing this closure has no good feel when opening, because it must be separated with a strong jerk. The reason for this is that the magnet is separated opposite to the closing direction and so has the typical jerky force curve of a magnet with maximum attraction in the closed position and strong non-linearly decreasing attraction with increasing distance of armature and magnet.

From the GB 1 530 591 A a door lock is known in which a first magnet arrangement is arranged on a door and a second magnet arrangement is arranged on a door frame. In a closed position of the door, these magnet arrangements are attractive and thus keep the door in the closed position. To open the magnet assemblies are moved laterally against each other. In this case, under the action of a projecting, button-like element on the door frame, the magnet assembly of the door is pushed away from the magnet assembly of the door frame against the action of a spring to cancel the lateral contact of the magnet assemblies a contact of the magnet assemblies and in this way friction and wear between to prevent the magnet arrangements.

The object of the invention is to provide a magnetic closure, which has a good feel, which can be built compact and is inexpensive to produce. The object is achieved with a magnetic closure according to claim 1, which has a magnet-armature construction with the following features: A magnet and an armature are designed so that for automatically closing the magnetic closure of the armature and the magnet attract each other, which of course one presupposes a predetermined minimum distance. This tightening takes place in a closing direction-which is not the opposite opening direction, because to open the magnet is laterally displaced or rotated relative to the armature.

When closing a magnetic surface of an anchor face is attracting. The magnet, the armature and in particular the attracting surfaces are dimensioned so that the desired suit and the desired locking force can be achieved. When the shutter is closed, an armature surface and a magnetic surface touch or are closely spaced.

When the armature is laterally depressed to open the armature, the area with which the armature faces the magnet decreases, which also reduces the magnet-armature attraction. This displacement or twisting is carried out up to the opening position, in which the opposing surfaces of magnet and armature have the smallest size.

Since the combination of features described above is known from the prior art, a more detailed description can be dispensed with. It is also clear to the person skilled in the art that an armature can also be a second magnet.

According to the invention, an opening assist spring is provided to assist the opening operation. The opening support spring is stretched at the time of opening and acts against the remaining magnetic force, so depending on the size of this spring force a jerky opening of the closure can be reduced or avoided altogether. The tensioning of the opening assist spring may be at different times. It is possible to tighten the opening support spring already when closing or only when opening the shutter.

If the clamping of the opening support spring when closing done, the construction is designed so that the opening support spring is tensioned by the force acting between the magnet and armature during the closing magnetic force. If then during opening ie when moving sideways or when turning from magnet to armature, the magnetic locking force is always lower, there is an additional weakening of this locking force by the opposite acting spring force. If in the opening position of the closure, the remaining magnetic locking force is just as large as the spring force, both forces cancel each other, so that the closure can be separated without force.

If the tensioning of the opening assist spring is to take place only upon opening, the structure is designed such that the opening assist spring is pretensioned upon opening, i. H. when moving sideways or when turning from magnet to armature, the opening support spring is biased by the applied force.

According to claim 2, the acting spring force of the opening assist spring in the open position is greater than the remaining magnetic attraction force between the shutter halves. As a result, the closure halves are separated by themselves, so that approximately the same feel is achieved, which is known from the polarity reversal magnetic closures, in which the closure halves are actively pressed apart by magnetic repulsion force.

According to claim 3, first, the opening assist spring is biased before the displacement or rotation between magnet to anchor begins. If then the displacement or the rotation between magnet has used to anchor, the force acting against the magnetic force spring force also causes an improvement in the opening haptics.

According to claim 4, the opening support spring is executed in the form of at least two adjacent detent springs with rising beveled detents or as an open detent spring ring with a least 2-threaded thread with bevelled threads.

The detent springs or the detent spring ring snap when closing by the magnetic force and secure the closure so in addition form-fitting and also serve during the opening as opening support springs. This is caused by the interaction with also beveled threads or linearly rising tapered locking lugs on the movable connecting module by the biased spring detents push the locking lugs out of positive engagement and bias by the shift in the direction of the slope of the locking lugs.

The magnetic force, the minimum overlap surface, the bevels on the detent springs and the spring tension are tuned so that the deflected by the slopes of the detents bias of the detent spring is stronger than the remaining magnetic force in the open position with minimal overlap area, so that the shutter in the open position the acting as opening springs, biased at opening detent springs or by the biased when closing detent spring ring opens.

It is clear to the person skilled in the art that the technical teaching according to claim 1 can be implemented very widely in concrete embodiments of magnetic closures without requiring an inventive performance. Thus, the magnetic closure according to the invention can be used according to claim 1 as a magnetic module for closures, the z. In the document WO 002008006357 or DE 10 2007 033 277 are described in which magnetic fasteners have an additional mechanical lock. When opening the shutter by lateral displacement of armature and magnet this lock is released. The number and size of the magnets used can be reduced in the application of the technical teaching of claim 1 and thus costs can be saved.

The invention will be described in more detail below with reference to embodiments in conjunction with the accompanying drawings.

1

erstes Verbindungsmodul

2

zweites Verbindungsmodul

3

Anker

4

Magnet

5,5a,5b

Feder

6

Auswurfstift

6a

Schraubfläche des Auswurfstifts

6b

Schräge an Feder

7

Auswurfvorrichtung

8

Führungshilfen am ersten Verbindungsmodul

9

Führungshilfen am zweiten Verbindungsmodul

10

Kipphebel

11

kraftumlenkende Schräge oder Schraubenfläche

12

Exzenter

13

Achse

Fig. 1a

zeigt eine Explosionsdarstellung eines Drehverschlusses.

Fig. 1b

zeigt eine Schnittdarstellung eines Drehverschlusses beim Schließvorgang.

Fig. 1 c

zeigt eine Schnitt- und perspektivische Ansicht mit verdeckten Elementen eines Drehverschlusses in Schließstellung.

Fig. 1 d

zeigt eine Schnitt- und perspektivische Ansicht mit verdeckten Elementen eines Drehverschlusses beim Öffnungsvorgang nach erfolgter Drehung.

Fig. 1e

zeigt eine Schnittansicht eines Drehverschlusses beim Öffnungsvorgang nach erfolgter Drehung.

Fig. 1f

zeigt eine Schnittansicht eines Drehverschlusses beim Öffnungsvorgang nach erfolgter Drehung und während des Auswurfs durch den Auswurfmechanismus.

Fig. 2a

zeigt eine Explosionsdarstellung einer Steckschnalle mit Kippanker.

Fig. 2b,2c,2d

zeigen die Steckschnalle in Seitenansicht beim Schließvorgang.

Fig. 2e,2f

zeigen die Steckschnalle in Seitenansicht beim Öffnungsvorgang.

Fig. 3a

zeigt einen linear verschiebbaren Verschluss in Schnittansicht in Schließposition.

Fig. 3b

zeigt einen linear verschiebbaren Verschluss in Schnittansicht nach erfolgter Verschiebung.

Fig. 3c

zeigt einen linear verschiebbaren Verschluss in Schnittansicht nach Öffnung.

Fig. 11 b

zeigt eine Schnitt- und perspektivische Ansicht mit verdeckten Elementen eines Drehverschlusses in der Schließstellung.

Fig. 11c

zeigt eine Schnitt- und perspektivische Ansicht mit verdeckten Elementen eines Drehverschlusses nach erfolgter Drehung.

Fig. 11d

zeigt eine Schnittansicht mit verdeckten Elementen eines Drehverschlusses beim Öffnungsvorgang nach erfolgter Öffnung.

Fig. 11e

zeigt eine Schnittansicht eines Drehverschlusses beim Öffnungsvorgang nach erfolgter Drehung.

Fig. 12a

zeigt eine Explosionsdarstellung einer Steckschnalle mit einem Kippanker.

Fig. 12b

zeigt eine Steckschnalle in Schnittansicht in Schließstellung.

Fig. 12c

zeigt eine Steckschnalle in Schnittansicht beim Öffnen.

Fig. 13a

zeigt einen linear verschiebbaren Verschluss in Schnittansicht in der Schließposition.

Fig. 13b

zeigt einen linear verschiebbaren Verschluss in Schnittansicht nach erfolgter Verschiebung.

Fig. 13c

zeigt einen linear verschiebbaren Verschluss in Schnittansicht nach Öffnung.

Fig. 13d

zeigt einen linear verschiebbaren Verschluss in Explosionsdarstellung.

Fig. 14

zeigen eine Ausführungsform als Taschenverschluss.

Fig. 14a

zeigt eine Explosionsdarstellung.

Fig. 14b

zeigt die Lage der Schnitte A-A und B-B.

Fig. 14c

zeigt die Schnittdarstellung A-A des Verschlusses in Ruhestellung.

Fig. 14d

zeigt die Schnittdarstellung B-B des Verschlusses in betätigter Stellung kurz vor dem Öffnen.

Fig. 16-17

zeigen eine linear verschiebbare Ausführung eines Magnetverschlusses.

Fig. 16a

zeigt in Seiten- und Schnittansicht A-A den Magnetverschluss

Fig. 16a'

in Schließstellung aus Fig. 17b.

Fig. 16b

zeigt in Seiten- und Schnittansicht A-A den Magnetverschluss kurz

Fig. 16b'

vor der Offenstellung.

Fig. 17a

zeigt eine perspektivische Darstellung beider Module.

Fig. 17b

zeigt eine perspektivische Darstellung beider Module in Schließstellung.

List of reference numbers used:

1

first connection module

2

second connection module

3

anchor

4

magnet

5,5a, 5b

feather

6

ejector pin

6a

Screw surface of the ejector pin

6b

Sloping on spring

7

ejector

8th

Guidance aids on the first connection module

9

Guide aids on the second connection module

10

rocker arm

11

force-deflecting bevel or helical surface

12

eccentric

13

axis

Fig. 1a

shows an exploded view of a rotary closure.

Fig. 1b

shows a sectional view of a rotary closure during the closing process.

Fig. 1 c

shows a sectional and perspective view with hidden elements of a rotary closure in the closed position.

Fig. 1 d

shows a sectional and perspective view with hidden elements of a rotary closure during the opening operation after rotation.

Fig. 1e

shows a sectional view of a rotary closure during the opening operation after rotation.

Fig. 1f

shows a sectional view of a rotary closure during the opening operation after rotation and during the ejection by the ejection mechanism.

Fig. 2a

shows an exploded view of a buckle with tilt anchor.

Fig. 2b, 2c, 2d

show the plug buckle in side view during the closing process.

Fig. 2e, 2f

show the plug buckle in side view during the opening process.

Fig. 3a

shows a linearly displaceable closure in sectional view in the closed position.

Fig. 3b

shows a linearly displaceable closure in sectional view after the shift.

Fig. 3c

shows a linearly displaceable closure in sectional view after opening.

Fig. 11b

shows a sectional and perspective view with hidden elements of a rotary closure in the closed position.

Fig. 11c

shows a sectional and perspective view with hidden elements of a rotary closure after rotation.

Fig. 11d

shows a sectional view with hidden elements of a rotary closure during the opening operation after opening.

Fig. 11e

shows a sectional view of a rotary closure during the opening operation after rotation.

Fig. 12a

shows an exploded view of a buckle with a tilt anchor.

Fig. 12b

shows a plug-in buckle in sectional view in the closed position.

Fig. 12c

shows a plug buckle in sectional view when opening.

Fig. 13a

shows a linearly displaceable closure in sectional view in the closed position.

Fig. 13b

shows a linearly displaceable closure in sectional view after the shift.

Fig. 13c

shows a linearly displaceable closure in sectional view after opening.

Fig. 13d

shows a linearly displaceable closure in exploded view.

Fig. 14

show an embodiment as a pocket closure.

Fig. 14a

shows an exploded view.

Fig. 14b

shows the location of the sections AA and BB.

Fig. 14c

shows the sectional view AA of the closure in the rest position.

Fig. 14d

shows the sectional view BB of the closure in the actuated position shortly before opening.

Fig. 16-17

show a linearly displaceable version of a magnetic closure.

Fig. 16a

shows in side and sectional view AA the magnetic closure

Fig. 16a '

in the closed position Fig. 17b ,

Fig. 16b

shows in side view and section AA short the magnetic closure

Fig. 16b '

before the open position.

Fig. 17a

shows a perspective view of both modules.

Fig. 17b

shows a perspective view of both modules in the closed position.

Fig. 1a shows an embodiment of the connection modules 1 and 2. connection module 1 and 2 are rotatably guided by the guide means 8 and 9 against each other. In the connection module 1, the armature 3 and the ejection mechanism 7 are fixed by a leaf spring 5 and an ejector pin 6. In the connection module 2, the magnet 4 is attached. As in Fig. 1b seen, the ejector pin protrudes in the relaxed state of the spring 5 beyond the armature. The spring is sized so that it is tensioned at the consummate encounter of armature and magnet, as in Fig. 1c to see. Fig. 1d and 1e show that with suitable geometry after twisting armature and magnet, the overlap area of armature and magnet has become smaller and thus the magnetic attraction has reached the state of minimum attraction. The spring is still sized to fit as in Fig. 1f shown, overcoming the residual attraction of magnet and armature and separating the magnetic shutter.

The popping of the magnetic closure has thus been achieved by a rotation of the connection modules, which was perceived by the person who operates the closure as pleasant to the touch.

The buckle after Fig. 2 a - f is another embodiment of the closure according to the invention. Here, the connecting module 2 designed as a plug is guided in the housing guide 9 of the connection module 1. In the connection module 1, the rocker arm 10 is mounted tiltable with anchor 3. The ejection mechanism, that is, the opening assisting spring is here formed by the spring portions 5a, 5b and supported by a slight deformability of the housing. The Fig. 2b - 2d show how after plugging the plug into the housing, the plug is pulled by the magnetic force in the housing and the spring portions 5a, 5b stretched by the magnetic force, ie are bent straight. Will the rocker arm 10 with the anchor, as in Fig. 2e, 2f shown, tilted tilted by the magnet, the magnetic attraction is so far attenuated that the prestressed spring force of the spring portions 5a, 5b is stronger than the remaining magnetic attraction between armature and magnet, so that the plug is ejected.

Fig. 3a shows an embodiment of a linearly displaceable magnetic closure.

The connection modules 1 and 2 are guided by the guides 8a, 9a and 8b, 9b in a linear direction of movement. The eject mechanism is constituted by the opening assist spring 5, which is cocked in the shown closed state.

The Fig. 3b shows the closure after a successful displacement of armature and magnet against each other. The Fig. 3c shows how, after the shift in the position of minimum magnetic attraction, the spring force of the ejection mechanism is greater than the attraction, so that the connection modules 1 and 2 jump up.

The above description relates to an embodiment in which the biasing of the opening assist spring is performed during closing operation. The following is based on the FIGS. 11-13 describes the operation of the invention, when the biasing of the opening support spring during the displacement or rotation between the magnet and armature, ie during the opening movement takes place.

In detail shows Fig. 11b the structure of the magnetic closure of the connection modules 1 and 2. Connection module 1 and 2 are rotatably guided by the guide means 8 and 9 from a predetermined distance against each other. In connection module 1, the armature 3 and the ejection mechanism 7, consisting of leaf spring 5 and ejector pin 6 are fixed. In the connection module 2, the magnet 4 is attached. As in Fig. 11b seen, the ejector pin 6 does not protrude beyond the anchor in the relaxed state of the spring 5. The ejector pin 6 is provided on the underside with a screw 6a. This screw 6a meets the provided on the connection module 2 kraftumleitende screw surface 11. Die Fig. 11c shows how after turning of connection module 1 and connection module 2, the screw 6a and 11 have pressed the Aufsetzstift against the spring until it is stretched and the ejector mechanism of the spring 5 and the ejector pin 6 generates a force acting against the magnetic attraction force.

The Figures 11c and 11e also show that with proper geometry of armature and magnet after twisting, the overlap area of armature and magnet has become smaller and thus the magnetic attraction has reached the state of minimum attraction. The spring is still sized so that, as in Fig. 11d shown, overcomes the residual attraction of magnet and armature and pushes the closure against the magnetic force, which is perceived as pleasant to the touch.

The buckle after Fig. 12a - c is another embodiment of the closure according to the invention. Here, the connection module 2 is designed as a plug with the guide surfaces 9 and guided in the housing guide 8 in the connection module 1. In the connection module 1, the rocker arm 10 is tiltably mounted with the armature 3 on the axis 13.

The ejection mechanism is formed here by the opening support springs 5a, b, which rest unrestrained on the axis 13 in the closed position.

Fig. 12c shows how after the tilting of the rocker arm 10, the spring portions 5a, 5b are tensioned by the eccentric 12. As a result, the plug is ejected in the arrow direction because the force of the ejection mechanism 7 is stronger than the residual magnetic attraction. If the rocker arm 10 with the armature, as shown in Fig. 12e, 12f, tilted from the magnet, the magnetic attraction is so far attenuated that the prestressed spring force is stronger than the remaining magnetic attraction between armature and magnet, and the plug. 2 is ejected.

Fig. 13a shows an embodiment of a linearly displaceable magnetic closure.

Connection module 1 and 2 are guided by the guides 8a, 9a and 8b, 9b in a linear direction of movement in the arrow direction. The ejection mechanism of the spring 5 is relaxed in the closed state shown.

Fig. 13b shows how after the displacement of the connecting modules 1, 2, the armature and the magnet are brought into the position of minimum attraction and the spring 5 of the ejection mechanism was biased by means of the obliquely to the direction of displacement attack surface 6b of the spring 5 during the displacement. Fig. 13c Figure 4 shows how, after being shifted to the position of minimum magnetic attraction, the spring force of the ejector mechanism is greater than the force of attraction and the shutter will pop open.

• Fig. 14a zeigt in Explosionsdarstellung alle Einzelteile:
  • In der oberen Manschette 1 d ist das Drehteil 1a gelagert. Der Manschettenring 1c dient zur Fixierung z. B. in der Stofflage eines Taschendeckels.
  • Der Drehhebel 1a ist auf das Drehteil 1 b gesteckt.
  • Im Drehteil 1 b ist der rechteckige Anker 3 angeordnet, sowie die angeschrägten Gewindegänge 11a, 11b.
  • Diese Gewindegänge 11 a, b sind in Schließstellung in Eingriff gerastet hinter die Gewindegänge 10a, b des als Öffnungsfeder wirkenden Rastrings 5.
  • Im Fußteil 2c ist der Magnet 4 angeordnet, der in Ruhestellung gegenüber Anker 3 steht.
  • Das Fußteil ist in der unteren Manschette 2a befestigt. Der untere Manschettenring 2b dient zur Fixierung z. B. in der Stofflage eines Taschenkorpus.
• Fig. 14b zeigt die Lage der Schnitte A-A und B-B. Fig. 14c zeigt die Schnittdarstellung A-A des Verschlusses in Ruhestellung, in der sich Magnet 4 und Anker 3 mit maximaler Überlappungsfläche gegenüberstehen. Beim Schließen hatte die magnetische Anziehung zwischen Anker 3 und Magnet 4 den Rastring 5 mittels der angeschrägten Gewindegänge 10a,b und 11a,b aufgespreizt, bis schließlich die Gewindegänge 11a, b des Drehteils hinter die Gewindegänge 10a, b des Rastrings gerastet sind und einen Formschluss von Verbindungsmodul A und Verbindungsmodul B erreicht haben.
• Fig. 14d zeigt die Schnittdarstellung B-B des Verschlusses in betätigter Stellung kurz vor der Öffnung. Hier wurde das Drehteil 1 b über den Drehgriff 1 a soweit gedreht, dass der Anker 3 den Magneten 4 nur noch minimal überlappt und damit die magnetische Anziehung erheblich geschwächt wurde. Außerdem hat die Drehung bewirkt, dass die angeschrägten Gewindegänge 11a, b des Drehteils 1 b die angeschrägten Gewindegänge 10a, b des Rastrings 5 während der Drehung in Pfeilrichtung auseinandergedrückt haben. Wie ersichtlich ist, entsteht nun durch die Wechselwirkung der angeschrägten Gewindegänge 10a, b, und 11a, b mit der Vorspannung des Rastrings eine gegen die Magnete wirkende Auswurfskraft. In Öffnungsstellung sind Magnetkraft und Federkraft so vorbestimmt, dass diese

Fig. 14 ad show a further special embodiment as a pocket closure according to claim 4. Here, the opening spring is designed as a threaded locking-latch spring, which is explained below:

• Fig. 14a shows in exploded view all items:
  • In the upper sleeve 1 d, the rotary member 1a is mounted. The sleeve ring 1c is used for fixing z. B. in the fabric layer of a pocket cover.
  • The rotary lever 1a is placed on the rotary part 1 b.
  • In the rotary part 1 b of the rectangular armature 3 is arranged, and the bevelled threads 11 a, 11 b.
  • These threads 11 a, b are latched in the closed position behind the threads 10 a, b of the opening spring acting as a detent ring fifth
  • In the foot part 2c of the magnet 4 is arranged, which is in the rest position relative to armature 3.
  • The foot part is fixed in the lower cuff 2a. The lower collar ring 2b is used for fixing z. B. in the fabric layer of a bag body.
• Fig. 14b shows the location of the sections AA and BB. Fig. 14c shows the sectional view AA of the shutter in the rest position, in which face magnet 4 and armature 3 with maximum overlap surface. When closing the magnetic attraction between armature 3 and magnet 4 had the locking ring 5 by means of the tapered threads 10a, b and 11a, b spread until finally the threads 11a, b of the rotary member are locked behind the threads 10a, b of the locking ring and a positive connection from connection module A and connection module B.
• Fig. 14d shows the sectional view BB of the closure in the actuated position just before the opening. Here, the rotary member 1 b was rotated so far over the rotary handle 1 a that the armature 3, the magnet 4 only minimally overlaps and thus the magnetic attraction was significantly weakened. In addition, the rotation has caused the tapered threads 11 a, b of the rotary member 1 b, the beveled threads 10 a, b of the locking ring 5 have been pressed apart during the rotation in the arrow direction. As can be seen, arises now by the interaction of the tapered threads 10a, b, and 11a, b with the bias of the locking ring acting against the magnets ejection force. In the open position magnetic force and spring force are predetermined so that this

Ejection force is greater than the remaining magnetic force between armature and magnet and thus opens the shutter.

Fig. 17a . b such as 16a . b show a linearly displaceable embodiment of the magnetic closure with an opening spring according to claim 4, in which the first connection module 1 and the second connection module 2 are linearly shifted from each other.

Fig. 17a shows in perspective view both modules. In connection module 1, the magnet 4 is attached. In addition, in the connection module 1, the tapered spring catches 10a, 10b, 10c, 10a ', 10b', 10c 'are provided. In connection module 2, the armature 3, and the tapered locking lugs 11 a, 11 b, 11 c, 11 a ', 11 b', 11 c '. The tapered spring catches 10a, 10b, 10c, 10a ', 10b', 10c ', as well as the tapered locking lugs 11 a, 11 b, 11 c, 11 a', 11 b ', 11 c' are arranged rising.

Fig. 17b shows a perspective view of the connection modules in the closed position. Here, the magnetic attraction of magnet and armature, which face each other in maximum overlap area, the tapered spring catches 10a, 10b, 10c, 10a ', 10b', 10c 'behind the tapered locking lugs 11a, 11 b, 11 c, 11 a', 11 b ', 11 c' engaged.

Fig. 16a shows in side and sectional view AA the magnetic closure in the closed position Fig. 17b ,

Fig. 16b shows in side and sectional view AA the magnetic closure shortly before open position after the linear displacement.

Here, the connection modules 1 and 2 have been shifted so far against each other in the direction of the pitch of the locking lugs that the tapered, rising detents 11 b, 11 c, 11 b ', 11 c' the tapered spring catches 10 a, 10 b, 10 a ', 10 b 'with their bevels have gradually pressed during the displacement in a cocked position. As can be seen, arises now by the interaction of the tapered spring catches 10a, 10b, 10a ', 10b' and the tapered locking lugs 11 b, 11 c, 11 b ', 11 c' with the bias of the spring catches 10 a, 10 b, 10 a ', 10 b' acting against the magnets ejection force. In the open position magnetic force and spring force are coordinated so that this ejection force is greater than the remaining magnetic force between the armature and magnet and thus opens the shutter.

For a better overview are the sectional drawings of Fig. 16a , the closed position and 16b, the open position, on a separate sheet again than Fig. 16a 'and 16b' enlarged faced.

It should be pointed out that the spring catch 11b is pressed by latching lug 11c and 10a by 11b, d. h., The closure according to the invention always requires a plurality of spring detents, which are each pressed by the adjacent locking lug, and would not work with a single spring detent. This shows the advantage of the embodiment as a thread with at least 2 courses: there is no free end, that is, all spring detents are used both as a form-closing elements and as opening support springs, while in the linear design always remain free ends.

Claims (4)

1. A magnetic closure which has a magnet-armature structure which has the following features:

   - a magnet (4) and

   - an armature (3),
   wherein the magnet (4) and the armature (4) are formed such that

   - for the automatic closing of the magnetic closure the armature (3) and the magnet (4) mutually attract each other in a closing direction below a predetermined minimum distance, and

   - for opening, the magnet (4) is laterally shifted or rotated with respect to the armature (3) into an open position, so that the surfaces of magnet (4) and armature (3) facing each other in a mutually attracting manner become smaller, whereby the force of attraction between magnet (4) and armature (3) becomes smaller,
   characterized in that

   - an opening-assisting spring (5) is provided in the magnetic closure for assisting the opening of the magnetic closure, wherein the opening-assisting spring (5) acts against the magnetic force between magnet (4) and armature (3) in the closing direction, wherein the opening-assisting spring (5) either

   - is automatically pretensioned by the magnetic force during the automatic closing,
   or

   - is pretensioned during the opening operation, i.e. when laterally shifting or rotating the magnet (4) with respect to the armature (3).
2. The magnetic closure according to claim 1, characterized in that the magnetic closure is formed such that the acting spring force of the opening-assisting spring (5) is greater than the magnetic force of attraction in the open position.
3. The magnetic closure according to claim 1, characterized in that the magnetic closure is formed such that the opening-assisting spring (5) first is pretensioned before shifting or rotating between magnet (4) and armature (3) starts.
4. The magnetic closure according to claim 1, characterized in that the opening-assisting spring is configured as at least two adjacent detent springs (5a, 5b) with rising beveled detents (10a, b) or as an open detent spring washer (5) with an at least two-flight thread with beveled flights, which during opening are pushed out of engagement and pretensioned by means of the linearly rising beveled detent lugs (11a, b) on a movable connecting module due to shifting by a cooperation of the beveled spring catches (10a, b) and detent lugs (11 a, b),

   - wherein the magnetic force, the minimum overlap area, the bevels on the detent springs (5a, b) and the spring tension are adjusted such that the pretension of the detent spring (5) deflected by the bevels of the detents (10a, b; 11 a, b) is stronger than the remaining magnetic force in the open position with minimum overlap area, and

   - wherein the pushing open and pretensioning of the detent springs (5a, b) is not effected by the detent lugs or flights facing each other in the closed position, but by the adjacent detent lugs (10a, b) or flights (11a, b).

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