Closure for the detachable connection of two elements

Abstract

Clasp, especially for necklaces, bracelets or other jewelry, with - a first closure part (1) with a receiving space (6), - a second closure part (2) which can be inserted into the receiving space (6) on the first closure part (1), - a locking mechanism for the unlockable locking of the second closure part (2) in the receiving space (6) of the first closure part (1), wherein the locking mechanism has at least one spring element (5) which is arranged on one of the two closure parts (1; 2) and which can be actuated transversely to an insertion direction of the second closure part (2), and which is designed for locking with a spring element arranged on the other closure part (2;1) formed locking projection (7) and which is tensioned when the second closure part (2) is inserted into the receiving space (6) of the first closure part (1), wherein the at least one spring element (5) is assigned a matched recess (4) formed in a peripheral wall of the receiving space (6), into which recess the spring element can be displaced when the second closure part (2) is inserted and pulled out and engages behind the locking projection (7) under its spring force when an insertion depth is reached, characterized in that the closure part (2) having the locking projection (7) is provided with an unlocking plug (9) which is displaceable along the closure part (2) in the insertion direction and which has an actuating surface which can be placed against the at least one spring element (5) and lifts the latter out of the locking projection (7) against its spring action.

Description

[0001] The invention relates to a closure for the releasable connection of two elements, according to the preamble of independent claim 1.

[0002] DE 198 47 052 C2 discloses a clasp for jewelry items, which is cited as an example of a snap fastener. It consists of a hook-shaped, curved base body that is open on one side and a movable locking lever connected to the latter. In its rest position, into which it is pressed by the force of a spring, the movable locking lever at least partially closes the opening in the base body and, together with the base body and spring, creates a first closed eye. The connection between the base body and the locking lever is formed exclusively by the spring, which for this purpose is connected in the area of its ends, on the one hand to the base body and on the other hand to the locking lever. The locking lever has a lever arm which, in the rest position of the locking lever, points towards the side of the base body opposite the opening and projects into an elongated recess therein.The length and position of the recess determine the maximum deflection of the locking lever, with the locking assembly featuring a second closed eyelet formed by the base body, the spring, and the locking lever with the lever arm provided thereon. Such locking components are visually conspicuous, which is undesirable in many cases. Furthermore, handling such closures is difficult, particularly due to the small lever size. Known spring ring closures also have the same disadvantages.

[0003] Commercially available magnetic clasps, which lack any safety features and therefore have to be sheared off or pulled apart with increased force to open, can lead to accidental opening if the piece of jewelry gets caught. If the magnet is too strong, the piece of jewelry can also tear. DE 20 2007 018 237 U1 describes a magnetic clasp that, unlike a classic magnetic clasp, has a bayonet closure added as a safety feature to prevent accidental loss. However, the bayonet closure requires a guide groove and an extension, which makes it difficult to use, as the clasp can only be closed when the two clasp parts are in exactly one predetermined position relative to each other.

[0004] DE 298 07 859 U1 describes a clasp for jewelry items that has a housing with a side opening allowing access to the interior. Two levers are arranged in the interior of the housing, each of which is pivotally mounted on a pivot bearing designed as a projection at their ends farthest from the opening. Each lever has an extension that projects out of the housing through a recess in the long, narrow sides of the housing. When pressure is applied to the extensions, the levers are pivoted about the projections against the action of a spring bent from wire. This causes the ends of the two levers closest to the opening to be pressed towards the adjacent long, narrow sides of the housing. These ends closest to the opening each have an engagement part with inclined surfaces that slope down towards the adjacent long, narrow side in the insertion direction of the first end of the piece of jewelry.Adjacent to this is an undercut on each engagement part, which interacts with a hook-shaped engagement means on the extensions. When the first end of the piece of jewelry is pushed into the housing in the insertion direction, the engagement means of the first end of the piece of jewelry slide onto the inclined surfaces of the engagement parts of the levers and deflect the piece against the force of the spring until the engagement means have slid over the projecting edge of the undercuts and the levers spring back. This is intended to create a particularly reliable and secure clasp, since in addition to the force-locking connection between the levers and extensions of the plug-in part of the first end of the piece of jewelry, a simultaneous positive connection at the undercuts between the engagement means of the end of the piece of jewelry and the engagement parts of the lever is ensured.The disadvantage of the known clasp is not only its relatively complex construction, but also that disengaging the operative engagement between the locking mechanism located in the casing and the plug-in part of the first end of the piece of jewelry, which is inserted through the opening in the casing, is cumbersome. To do this, two small projections protruding from the casing must be pressed together to move the levers apart again against the action of the spring, thereby disengaging their operative engagement with the end of the piece of jewelry. Furthermore, the projections protruding from the casing detract from the design of the clasp.

[0005] DE 197 41 406 C2 discloses a clasp for jewelry pieces, which is cited as an example of a bayonet clasp. This clasp features a guide groove on the plug portion and a projection on the plug receptacle portion. A spring is located in the housing of the plug receptacle portion, which compresses when the plug portion is inserted. After twisting the plug portion, the spring expands again and secures the plug portion in the designated recess of the groove. Operation is made more difficult by the fact that the two clasp portions must be precisely positioned relative to one another.

[0006] DE 22 07 899 A discloses a clasp for jewelry articles. This clasp consists of a shackle that is axially movable within the clasp case. The bolt, which is pressed in beyond the locking position and expandable by spring action and has transverse projections, penetrates into this clasp under friction. This bolt, when pulled out, allows the shackle to pass over the contact points of the shackle legs on the clasp case lugs. Handling such clasps is difficult, particularly due to the small shackle size combined with only one precise, mutually maintainable position of the two clasp parts. Known spring-ring clasps and snap-hook clasps also have the same disadvantages.

[0007] A clasp for jewelry items is known from DE 35 09 643 C1. In this clasp, the plug has an opening cone and a freely movable ring on the guide pin. The socket encloses a spring sleeve. When inserted, the cone opens the sleeve, which closes again beneath the cone. The clasp is then created. When pressed repeatedly, the ring opens the sleeve and is clamped within it. It is released again when it is carried along by the extended cone when the plug is pulled out, which is itself pulled out of the sleeve in the process. Because the spring element is designed as a spring sleeve without recesses in the peripheral wall of the socket that are adapted to the spring element, the cone has no lateral guidance when inserted and can move freely in all directions.Furthermore, when choosing a spring sleeve instead of one or more individual spring elements, the geometry and arrangement of the spring elements is limited and the housing cannot serve as a guide for the cone, sleeve and plug due to the lack of individual recesses for spring elements.

[0008] The object of the present invention is to provide an improved closure, particularly for jewelry items such as necklaces or bracelets, that is unobtrusive and easy to use, yet at the same time reliable and secure. This object is achieved by the features of claim 1. Advantageous developments of the invention are the subject of the dependent subclaims.

[0009] The inventive design, in which the closure part having the locking projection is provided with an unlocking plug that is displaceable in the insertion direction along the closure part and has an actuating surface that can be positioned against the at least one spring element and lifts the latter out of the locking projection against its spring action, allows particularly simple actuation of the closure, even without having the latter in view, which can often be the case, for example, when putting on or taking off a necklace. To unlock, the unlocking plug only needs to be displaced in the axial direction or insertion direction of the closure part, whereby its actuating surface comes into contact with the spring element and then lifts the latter - transversely to the direction of movement of the unlocking element - out of its engagement with the locking projection.

[0010] In a particularly advantageous embodiment, the release plug can be designed in the form of a sliding sleeve that is axially displaceably mounted on the locking part having the locking projection. The receiving space can have a round, oval, or polygonal cross-section, with the second locking part being adapted to the cross-sectional shape of the receiving space.

[0011] The actuating surface of the release plug is preferably adapted in shape and dimensions to the design of the locking projection. Thus, if the locking projection is designed as a circular ring in one embodiment, which has proven particularly useful when designing the locking part as a rotationally symmetrical component, the actuating surface of the release plug is then preferably also circular, whereby it can have the same or a slightly larger outer diameter.

[0012] In an advantageous embodiment of the invention, the second closure part can have a guide head adapted to the inner cross-section of the receiving space, with a web adjoining its rear end face. The guide head then forms the locking projection for the at least one spring element with a rear end face in the insertion direction. In this embodiment, the release plug can preferably be mounted on the web so that it can be axially displaceable toward the guide head and in the opposite direction, and can thus be easily displaced relative to the web of the closure part.

[0013] In an advantageous development of the invention, the release plug can be provided with an actuating projection on a rearward area facing away from the locking projection, which is extended relative to the actuating surface. This allows the release plug to be easily felt and actuated even without visual contact.

[0014] Preferably, the at least one spring element is assigned a recess formed in a peripheral wall of the receiving space, into which recess the spring element can be displaced when inserting and removing the second closure part. When the closure is unlocked by sliding the release plug, the at least one spring element is then displaced into its assigned recess. The spring element, which is then pre-tensioned, receives lateral support in the recess and is protected in this position, so that no damage is to be feared.

[0015] It is particularly preferred if the at least one spring element is designed in the manner of a leaf spring clamped on one side, which interacts with the locking projection by means of a free locking end projecting radially inwards or outwards relative to the clamped end. The leaf spring can have essentially any cross-sectional shape, e.g. a rectangular, a round or an oval cross-section, whereby the shape is not restricted to these examples. Depending on the choice of cross-sectional shape and the selected spring material, different spring constants and resistance moments result, which can be advantageously selected for different applications.

[0016] If the locking mechanism has several spring elements, preferably arranged axially or rotationally symmetrically, a uniformly good locking is ensured over the circumference of the closure.

[0017] An advantageous embodiment of the invention is characterized by a securing element acting between the second plug part and the unlocking plug, wherein the arrangement can advantageously be such that the unlocking plug is provided with the securing element to secure the position of the unlocking plug. If the unlocking plug is designed as a sliding sleeve that is displaceable along a web formed on the second plug part, the securing element is to be arranged on the latter, preferably in such a way that it secures the sliding sleeve essentially only in its retracted rest position, in that the sleeve is pushed over the securing element in this position. As soon as the sleeve is moved a short distance towards the first plug part to unlock the spring elements, it disengages from the securing element arranged at the rear end of the web and can then be moved freely without resistance from the web.In a particularly simple and cost-effective variant, the securing element can be an O-ring or a comparable component made of an elastomer material, which is arranged under slight tension between the second plug part and the release plug.

[0018] It is possible to provide the release plug with an insertion aid, in particular, for example, with a ramp or guide cone directed toward the spring element, which facilitates lifting the spring element from its locking position. It may also be advantageous to provide permanent magnets arranged on the first and / or second locking part, in particular in the receiving space and / or in the area of the locking projection, which provide the operator with guidance / threading assistance when closing the lock, as the effective magnetic forces center one locking part relative to the other.

[0019] Further details and advantages of the invention can be found in the embodiments described below with reference to the drawings.

[0020] It shows: Fig. 1 a first embodiment of a closure according to the invention in the open state, in longitudinal section; Fig. 2 the subject of the Fig. 1 in closed state, in longitudinal section; Fig. 3 a second embodiment of a closure according to the invention in the open state, in longitudinal section; Fig. 4 a third embodiment of a closure according to the invention in the open state, in longitudinal section; Fig. 5 The closure according to the invention in the closed state in a cross section AA according to Fig. 2; . Fig. 6 to 9 Alternative designs of the closure according to the invention in the closed state in Fig. 5 corresponding representations.

[0021] The various clasps illustrated in the drawings are primarily used to fasten pieces of jewelry such as necklaces or bracelets.

[0022] A first embodiment of the closure shows Fig. 1 in the open and Fig. 2 in the closed state. The closure essentially consists of a first closure part 1 and a second closure part 2, the design of which is adapted to the first closure part so that it can be inserted into it. The first closure part 1, which can also be referred to as a plug receptacle, forms a housing 3 with a receiving space 6, in the peripheral wall of which a plurality of recesses 4 are provided. These recesses 4 are adapted in shape and number to leaf spring-like springs 5, which are firmly clamped at their front end, on the right in the drawing, in the area of the opening of the receiving space 6 at the edge of the latter. The arrangement is such that, in the unloaded state, the springs protrude radially inwards into the receiving space with their free ends spaced from the opening, i.e., they are arranged in an oblique or conical manner, which can be clearly seen in the longitudinal sections of the drawing.To interact with the springs 5, the second closure or plug part 2 forms an elongated web 8 with a front head 7 and a projection 10 formed at the opposite end. A release plug 9 is axially displaceably mounted on the web, which has a smaller cross-section than the head 7 and projection 10. Since the embodiments shown in the drawings all have webs with a circular cross-section, the release plug is formed by a tube or sliding sleeve 9, the inner diameter of which is slightly larger than the outer diameter of the web 8, so that the release plug can be easily slid along it. The outer diameter of the release plug 9 is adapted to that of the head 7 or is slightly larger than it.

[0023] The two closure parts 1 and 2 can preferably be arranged at two different ends of a necklace, a bracelet, or another piece of jewelry that must be opened and closed for putting on and taking off. The two ends (or two other elements) are connected by inserting the second closure part or plug part 2, head 7 first, into the housing 3 of the first closure part or plug receiving part 1. When the plug part 2 is inserted into the receiving space 6, the head 7 presses the springs 5 radially outward, while the plug part 2 is pushed increasingly deeper into the receiving space 6. The outwardly bent springs thereby enter their respective recesses 4, which are adapted to the length and shape of the springs. Their lateral boundary walls reliably prevent the springs from bending in any direction other than the radial direction.After the head 7 has passed the springs 5, the latter spring back into their relaxed original position, with their free ends, which lie inside the receiving space and are on the left in the longitudinal section views, engaging the rear end face of the head 7, which forms a locking projection. The second locking part 2 is thus positively locked in the first locking part 1. In order to make it possible to pull the plug part 2 out of the receiving space 6 on the first locking part 1, the unlocking plug 9 is provided, which is mounted so as to be axially movable back and forth along the web 8. To release the locking, it can be moved from its first, rear position into the . Fig. 1 to 4, it can be moved forward toward the first locking part 1 and the head 7 locked therein by the springs 5. In doing so, its front circular end, whose outer diameter is slightly larger than that of the head 7, contacts the obliquely inwardly retracted springs in the housing 3 and, with increasing axial insertion depth into the housing 3, pushes them further and further radially outward until the springs are clamped so far into their respective recesses that their free ends no longer engage the locking projection of the head 7, and the head can thus be pulled out of the first locking part unhindered.

[0024] According to various embodiments, different cross-sectional contours can be selected. Fig. Some suitable examples are shown in 5-9.

[0025] Fig. Figure 5 shows a sectional view of an embodiment in which the housing 3 has a round shape. The receiving space (6) also has a round shape, as does the plug part 2, which is adapted to the shape of the receiving space 6. The round geometry of the plug part 2 is particularly advantageous because it eliminates the need for a precisely predetermined position of the two closure parts relative to one another, which significantly simplifies the insertion of the plug part 2 into the receiving space. The recesses 4 for the springs 5, which are also provided in the housing here, are coordinated in their geometric shape with those of the springs 5. In this embodiment, the springs 5 have a rectangular cross-section, which is reflected in the shape of the recesses 4. The geometric shape of the web 8 depends on that of the interior of the tube 9; in this embodiment, the web 8 and the interior of the release plug 6 have a round cross-section.

[0026] Fig. 6 shows a further embodiment in a corresponding representation as Fig. 5 . Here, the housing 3 has a rectangular cross-section, including the receiving space 6. Accordingly, the plug part 2 also has a rectangular cross-section adapted to the shape of the receiving space 6. The recesses 4 provided in the housing for the springs 5 are geometrically matched to that of the springs 5. Since the springs 5 are designed with a rectangular geometry in this embodiment, the recesses 4 adapted to them also have a rectangular shape. The design of the web 8 is matched to the internal cross-section of the tube 6 and is rectangular in the present embodiment.

[0027] In the further, in Fig. In the embodiment shown in Figure 7, the housing 3 is again round in cross-section, and the receiving space 6 also has a round shape. The plug part 2 is adapted to the shape of the receiving space 6. Here, too, the housing 3 contains recesses 4 for the springs 5. Since the springs 5 have a circular cross-section in this embodiment, the groove-like recesses 4 have a groove base adapted to the circular shape.

[0028] At the Fig. In the embodiment shown in Figure 8, the housing 3 and the receiving space 6 formed therein are again round in cross-section. The plug part 2 is adapted to the shape of the receiving space 6. In this embodiment, the springs 5 are formed from several segments of a tubular profile. Since the combined shape of the four springs complements a round tubular profile, a corresponding clearance is provided for the recess 4 in the wall of the receiving space. The design according to this embodiment can offer advantages that arise from Fig. 4 can be recognized.

[0029] At the Fig. In the embodiment shown in Figure 9, the housing 3 has an oval shape on the outside, while the receiving space 6 has a round cross-section, and the plug part 2 is adapted to it. Here, too, the housing contains recesses 4 for the springs, each of which is coordinated with the other.

[0030] If you now turn back to the Fig. 1 and Fig. 2, it can be seen that the head 7 of the second closure or plug part 2 is rounded at the front. This makes it easier to insert the plug part 2 into the receptacle on the first closure or plug receptacle part 1. Alternatively, other geometries of the front guide surface of the head can be selected, e.g. tapered or flat. At the opposite end of the head, i.e. in the direction of the rear web 8, it is important when selecting the geometry that there is a step or shoulder relative to the web 8, on which the springs 5 engage and find support. The head 7 can have a certain length with a constant diameter or cross-section between the front guide surface and the rearwardly adjoining shoulder at the transition to the web 8, which serves as a guide and simplifies insertion into the receptacle 4.

[0031] A central role in the locking mechanism is played by the unlocking plug 9, which in the exemplary embodiments is designed as a tube or sliding sleeve and is mounted so that it can move axially back and forth along the web 8. Its profile geometry can also vary; the inner shape is fundamentally matched to the shape of the web 8 and can therefore be freely selected to ensure axial mobility. To the extent that the tube 9 needs to be moved into the plug receptacle 1, its outer shape is matched to the geometry of the receiving space 6. It should be minimally larger than the head 7. This ensures that the springs are reliably pressed out of engagement with the stop collar formed by the rear edge of the head when the tube is pushed into the receiving space until it stops against the rear end face of the head for unlocking.

[0032] A further advantageous development of the invention is described in Fig. 3. There, the release plug is provided with a tubular projection 12 on the rear, which allows the tube 9 to be easily felt and operated. The geometric shape of the tubular projection 12 is not limited to the example shown; it can be designed according to the desired design.

[0033] A further advantageous development of the invention is described in Fig. 4. It can be seen there that the tube 9 is provided with a bevel 15 or chamfer at its front end pointing towards the head. A tapered shape has been selected for the bevel 15 here. This design simplifies the insertion of the plug part into the plug receptacle 1, into the receiving space provided therein and under the free ends of the springs 5. Alternatively, other geometries of the bevel 15 can also be selected, e.g., rounded or flat.

[0034] A further advantageous development of the invention is securing the tube 9 in the closed closure position. This is advantageous for preventing accidental opening of the closure. This securing can be achieved in a variety of ways. Depending on the intended application of the closure, one can choose between an elastic band, a spring, magnets, or a ring made of elastic material 13 adapted to the geometric shape of the web 8, e.g., an O-ring.

[0035] An example is in Fig. 4. The ring made of elastic material 13 is attached to the side of the web 8 facing away from the head 7, near the projection 10 on the web. For mounting the correspondingly designed closure part, the rear collar 19 can be provided with a threaded hole into which the web, which is provided with an external thread at the rear, is screwed. A drop of threadlocker reliably prevents accidental loosening of the screw connection. Before final assembly, the elastic ring is pushed onto the web and then the tube is slipped over it. When the tube 9 is pushed over the elastic ring 13, the ring is slightly compressed, thereby building up a certain amount of pressure on the tube 9 and thus fixing it in place, preventing the tube 9 from moving, for example due to sudden movements, and unintentionally opening the closure.

[0036] In a further advantageous embodiment, which is shown in Fig. 3, permanent magnets 11 are provided in both the plug receptacle 1 and the plug part 2 to simplify operation. These serve primarily as an additional threading aid and not for power transmission. The geometric shape of the magnets 11 is also preferably suitable for the embodiments described in Fig. 1 explained geometric specifications.

[0037] The invention is not limited to the illustrated and described embodiments; rather, various modifications and additions within the scope of the invention will be apparent to those skilled in the art. In particular, all new and / or advantageous individual features and combination features disclosed in the description and / or drawings may each be essential to the invention in their own right and may also be combined with one another in any desired manner without departing from the scope of the invention.

[0038] The invention provides a closure for connecting two elements, wherein the closure part consists of detachably connected parts, one of which is designed as a plug receiving part 1 and the other of which is designed as a plug part 2, wherein any number of springs 5 can be arranged in the housing 3 of the plug receiving part 1, which springs enable the head 7 to engage when the plug part 2 is inserted into the receiving space 6. The cross-section of the housing 3 can have any geometric shape, wherein the shape of the plug part 2 can be adapted to that of the receiving space 6.

[0039] The springs 5 can have any geometric shape, with the recesses 4 being able to suitably accommodate the springs 5. The plug part 2 can preferably consist of a head 7, web 8, and tube 9, with the tube 9 being expediently mounted on the web 8 so that it can move axially back and forth and can be moved between a first position, in which the closure is closed, and a further position, in which the springs 5 are bent into the recesses 4 provided for this purpose, thus enabling the closure to be opened.

[0040] Advantageously, the tube 9 may have a tubular projection 12. It may also have a locking device in the closed closure position.

[0041] It is also advantageous if permanent magnets 11 are fixed in both the plug receptacle 1 and plug part 2, thus facilitating the insertion of one into the other closure part. The head and / or tube can also have a chamfer for easier insertion. List of reference symbols: 1 first locking part / plug receptacle 2 second locking part / plug part 3 housings 4 Recess for spring 5 spring (element) 6 Recording room 7 (Guide) head / lock projection 8 bridge 9 release plugs / tubes 10 lead 11 Permanent magnet 12 Pipe projection / actuating projection 13 elastic material / safety element 14 Receiving space tubes 15 Chamfer / run-up slope

Claims

[1] Clasp, especially for necklaces, bracelets or other pieces of jewellery, with - a first closure part (1) with a receiving space (6), - a second closure part (2) which can be inserted into the receiving space (6) on the first closure part (1), - a locking mechanism for the releasable locking of the second closure part (2) in the receiving space (6) of the first closure part (1), wherein the locking mechanism has at least one spring element (5) arranged on one of the two closure parts (1; 2) and operable transversely to an insertion direction of the second closure part (2), which spring element cooperates with a locking projection (7) formed on the other closure part (2; 1) for locking purposes and which is tensioned upon insertion of the second closure part (2) into the receiving space (6) of the first closure part (1), wherein the at least one spring element (5) is assigned a recess (4) formed in a peripheral wall of the receiving space (6), into which recess the spring element can be displaced upon insertion and withdrawal of the second closure part (2) and engages behind the locking projection (7) under its spring force upon reaching an insertion depth, characterized bythat the closure part (2) having the locking projection (7) is provided with an unlocking plug (9) which is displaceable in the insertion direction along the closure part (2) and which has an actuating surface which can be positioned against the at least one spring element (5) and which lifts the latter out of the locking projection (7) against its spring action. [2] Closure according to claim 1, characterized by that the unlocking plug (9) is designed in the form of a sliding sleeve which is mounted in an axially displaceable manner on the locking part (2) having the locking projection (7). [3] Closure according to claim 1 or 2, characterized by that the receiving space (6) has a round, oval or polygonal cross-section and that the second closure part (2) is adapted to the cross-sectional shape of the receiving space. [4] Closure according to one of the preceding claims, characterized bythat the actuating surface of the release plug (9) is adapted in shape and dimensions to the design of the locking projection (7). [5] Closure according to one of the preceding claims, characterized by that the second closure part (2) has a guide head (7) which is adapted to the inner cross-section of the receiving space (6) and forms the locking projection, with a web (8) adjoining its rear end face, wherein the rear end face of the guide head forms the locking projection for the at least one spring element (5) and the unlocking plug (9) is mounted on the web so as to be axially displaceable in the direction of the guide head (7). [6] Closure according to one of the preceding claims, characterized by that the unlocking plug (9) is provided with an actuating projection (12) which is extended relative to the actuating surface in a rear area facing away from the locking projection. [7] Closure according to one of the preceding claims, characterized by that the at least one spring element (5) is designed in the manner of a leaf spring clamped on one side, which cooperates with the locking projection by means of a free locking end projecting radially inwards or outwards relative to the clamped end. [8] Closure according to one of the preceding claims, characterized by that the locking mechanism has several, preferably axially symmetrically arranged spring elements (5). [9] Closure according to one of the preceding claims, characterized by a securing element (13) acting between the second plug part (2) and the unlocking plug (9). [10] Closure according to one of the preceding claims, characterized by that the unlocking plug (9) is provided with an insertion aid, in particular a run-up slope (15) directed towards the spring element (5) or a guide cone. [11] Closure according to one of the preceding claims, characterized by permanent magnets (11) provided on the first and / or second closure part, in particular in the receiving space (6) and / or in the region of the locking projection (7).

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