Closure device for interconnecting two units
Patent Information
- Application Number
- EP2023820763
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2022-11-28
- Filing Date
- 2023-11-24
- Publication Date
- 2025-08-20
AI Technical Summary
Existing locking devices fail to ensure easy closure and reliable holding of locking parts while providing enhanced security, particularly in applications where excessive load may pose a risk to users, such as children's helmets.
A closure device comprising two interlocking parts with magnetic attraction and force introduction points, designed to align under load and automatically separate when the load exceeds a predetermined limit force, ensuring emergency release and reduced risk of injury.
The closure device securely holds assemblies together while automatically opening under excessive load, reducing the risk of injury and strangulation, and can be adjusted for varying loads by modifying magnetic attraction and geometric positioning.
Smart Images
Figure 1.1
Abstract
Description
[0001] Locking device for connecting two assemblies together
[0002] Description
[0003] The invention relates to a locking device for connecting two assemblies to one another according to the preamble of claim 1.
[0004] Such a closure device comprises a first closure part which has a first body, a first force introduction point arranged on the first body, a contact element arranged on the first body, and a first magnetic device. The closure device also comprises a second closure part which has a second body, a second force introduction point arranged on the second body, and a second magnetic device. To close the closure device, the first closure part and the second closure part can be placed against one another under magnetic attraction of the first magnetic device and the second magnetic device. In a closed position, the second body is supported on the contact element. To open the closure device, the first closure part and the second closure part can be separated from one another.
[0005] Two assemblies, for example two belt straps arranged on the bodies of the closure parts, can be connected to one another via the closure device, wherein the closure parts are connected to one another in the closed position and can be separated from one another in order to open the closure device. In the closed position, with a loaded closure device, a load force acts linearly at the second force introduction point along a load axis pointing through the first force introduction point and the second force introduction point. If the closure device is loaded, the closure device aligns itself such that a load axis, along which the force acts, points at least approximately through the first force introduction point on the first body of the first closure part and the second force introduction point on the second body of the second closure part.
[0006] In a closure device known from EP 2 825 075 B1, a first closure part has a locking element and a first locking projection formed on the locking element. A second closure part, in contrast, has a body and a second locking projection formed thereon. In a closed position, the locking projections engage with one another. A force introduction element is pivotably arranged on the second body at a force introduction point, so that, for example, a belt can be connected to the second closure part via the force introduction element.
[0007] The object of the present invention is to provide a closure device which enables simple closing of the closure device and, in the closed position, enables the closure parts to be reliably held together, but at the same time possibly increases the safety of the closure device in certain applications.
[0008] This object is achieved by an article having the features of claim 1.
[0009] Accordingly, when the locking device is loaded, the first locking part and the second locking part separate automatically from each other if the load force exceeds a certain limit force.
[0010] The closure parts of the closure device can be attached to one another with magnetic support from the magnetic devices arranged on the bodies of the closure parts such that, in the closed position, the second body of the second closure part is supported on the contact element of the first closure part. Forces are exerted on the closure device via the first force introduction point and the second force introduction point such that, when the closure device is loaded, a load force acts between the first force introduction point and the second force introduction point, and thus between the closure parts. In particular, a load force acts at the second force introduction point on the second body of the second closure part.A corresponding, opposing load force in a force balance acts at the first force introduction point of the first locking part, so that the locking parts are loaded relative to each other when the locking device is loaded.
[0011] The closure device is designed such that, when the closure device is loaded, the closure parts align with one another such that a load axis is directed through the first force introduction point on the first body of the first closure part and the second force introduction point on the second body of the second closure part. The load force acts linearly along the load axis, so that the closure parts are loaded relative to one another along the load axis.
[0012] The locking device is designed such that it opens automatically when the load force exceeds a predetermined limit. If the load force exceeds the limit, the first locking part and the second locking part separate automatically, thus opening the locking device in an emergency release.
[0013] The locking device can be used, for example, on a helmet or a piece of clothing. If the locking device is used in a children's home, for example, on a bicycle helmet for children, and the helmet gets caught on equipment in a playground, such as a climbing frame, the locking device can open automatically if excessive force is applied. This counteracts the risk of injury to a user due to excessive force. The risk of strangulation can also be reduced and the benefits increased with other strap arrangements or harnesses.
[0014] Associated assemblies can be connected to the closure parts via the first force introduction point and the second force introduction point. The connection of the associated assemblies, for example, straps or the like, is preferably carried out flexibly such that, under load, the closure device can be aligned such that the load axis points at least approximately through the force introduction points. The first force introduction point on the first body of the first closure part can be formed, for example, by a strap receptacle to which a strap can be attached.
[0015] The second force introduction point on the second body of the second closure part can also be formed by a belt strap receptacle to which a belt can be attached.
[0016] In another embodiment, the second closure part has a force introduction element which is movably, in particular pivotably, connected to the second body at the second force introduction point and on which the load force acts when the closure device is loaded. A force introduction element, for example in the form of a bracket, is thus arranged on the second body and is connected to the second body in an adjustably manner, in particular pivotably about a joint axis oriented perpendicular to the load axis. When the closure device is loaded, the force introduction element can be adjusted relative to the second body such that the closure device can align itself such that a load axis, along which the load force acts, can align itself such that the load axis points through the force introduction points.
[0017] In one embodiment, the second body is designed to automatically separate the first closure part and the second closure part from one another in a tilting direction about a tilting point on the contact element relative to the first body when the load force exceeds the predetermined limit force. The separation of the closure parts thus occurs automatically in such a way that the second closure part is tilted relative to the first closure part when the load force acting on the second closure part exceeds the limit force. The tilting occurs about a tilting point on the contact element, so that the second closure part with the second body is moved about the tilting point on the contact element relative to the first body of the first closure part and is thus brought out of engagement with the first closure part.
[0018] The tilting direction preferably defines a tilting plane. The load axis lies in the tilting plane. A tilting axis around which the tilting occurs is directed perpendicular to the load axis. In one embodiment, the tilting point is offset transversely from the load axis in the tilting plane. A tilting axis around which the tilting occurs extends, for example, along a transverse direction perpendicular to the load axis. The tilting point is offset relative to the load axis along a vertical direction perpendicular to the load axis and the transverse direction, so that the tilting point is not located on the load axis, but rather spatially spaced from the load axis.
[0019] Because the tipping point is not located on the load axis, a load force acting on the second locking part (which corresponds in magnitude to the load force acting on the first locking part in the force balance) does not act purely linearly on the second locking part, but rather causes a torque on the second locking part around the tipping point. If the load force is greater than the limit force, the torque generated by the load force causes the locking parts to separate from each other, with the second locking part tilting relative to the first locking part around the tipping point.
[0020] In one embodiment, in the closed position when the closure device is loaded, a magnetic attractive force of the first magnetic device and the second magnetic device causes a first torque about the tilting point on the second closure part. The load force also causes a second torque about the tilting point on the second closure part, opposite to the first torque. In the closed position, the second body of the second closure part is supported on the contact element on the first body of the first closure part. The second closure part is held on the first closure part by the magnetic attractive force of the first magnetic device of the first closure part and the second magnetic device of the second closure part, wherein the magnetic attractive force causes a torque about the tilting point on the second closure part in the direction of contact with the first closure part.However, this torque caused by the magnetic attraction is counteracted by a torque caused by the load force on the second closure part. The torque caused by the load force acts around the tilting point around which the second closure part can be tilted relative to the first closure part.
[0021] If the second torque caused by the load force exceeds the first torque caused by the magnetic attraction force, the first locking part and the second locking part separate automatically. If the torque caused by the load force, which acts toward opening the locking device, is greater than the torque caused by the magnetic attraction force, which acts toward holding the locking parts together, the locking parts separate, so that the locking device opens automatically when the load is sufficiently high.
[0022] The limiting force that must be exceeded by the load force for the locking device to open automatically under load is defined in particular by the magnetic attraction force of the magnetic device. This limiting force can be adjusted accordingly by dimensioning the magnetic devices and / or geometrically positioning the tilting points. The limiting force results from the lever ratio of a first lever arm, with which the magnetic attraction force acts between the locking parts at the tilting point, and a second lever arm, with which the load force acts on the second locking part at the tilting point, as well as the magnitude of the magnetic attraction force.
[0023] In one embodiment, the first body has a first surface section and the second body has a second surface section. The first surface section and the second surface section lie against one another in the closed position. The first body and the second body come into surface contact with one another with the surface sections when the closure parts are placed against one another. The first surface section of the first body and the second surface section of the second body can in particular be directed perpendicular to a direction of magnetic attraction brought about by the magnetic devices, so that the first body of the first closure part and the second body of the second closure part are drawn towards one another with the surface sections when the closure parts are brought closer to one another, and come into contact with one another with the surface sections when the closure device is transferred into the closed position.
[0024] In one embodiment, the magnetic attraction force of the first magnetic device and the second magnetic device acts perpendicular to the first surface section in the closed position. The surface sections that are in planar contact with one another in the closed position are thus aligned perpendicular to the magnetic attraction force of the magnetic devices when the closure device is in the closed position.
[0025] In one embodiment, the contact element protrudes from the first surface portion, viewed along a normal direction perpendicular to the first surface portion. The normal direction corresponds, for example, to the direction of the magnetic attraction force. Along the normal direction, the contact element protrudes relative to the first surface portion on the first body of the first closure part and, in the closed position, provides support for the second closure part.
[0026] In the closed position, the load axis extends between the first force introduction point on the first body of the first closure part and the second force introduction point on the second body of the second closure part when the closure device is subjected to a load force. The load axis can be inclined to the normal direction, but can also run perpendicular to the normal direction if necessary.
[0027] In one embodiment, the second force introduction point is arranged on the second body such that the second force introduction point, viewed along a direction perpendicular to the normal direction, is arranged between the contact element and a center of the first magnetic device. The direction perpendicular to the normal direction is, for example, also directed perpendicular to a tilt axis about which the second closure part can be tilted relative to the first closure part for opening. Spatially, the second force introduction point is thus arranged between the supporting contact element and a center of the first magnetic device on the first closure part when the closure parts are placed against one another in the closed position of the closure device.
[0028] In one embodiment, the contact element has a first engagement projection projecting transversely to the normal direction from a wall section of the contact element, and the second body has a second engagement projection. The first engagement projection and the second engagement projection engage with one another in the closed position. In the closed position of the closure device, the engagement projections can, in particular, provide support for the closure parts through a positive connection that acts along the normal direction and thus counteracts separation of the closure parts along the normal direction. With respect to the normal direction, the first engagement projection on the contact element of the first closure part forms an undercut in that the first engagement projection projects transversely to the normal direction from the contact element, for example in the direction of the first force introduction element on the first body of the first closure part.
[0029] In one embodiment, the first engagement projection and the second engagement projection can be tilted relative to each other to automatically separate the first closure part and the second closure part. If the load force on the second closure part is so great that the load force exceeds the limit force, the second closure part can be pivoted relative to the first closure part while tilting the engagement projections relative to each other, so that the closure parts can automatically separate from each other when the closure device is loaded.
[0030] In one embodiment, the first engagement projection and the second engagement projection are each formed by a toothed element. The first engagement projection and the second engagement projection thus each form a toothed element that has a tooth profile, for example, an involute profile, in the tilting plane. If the second closure part is tilted relative to the first closure part to automatically separate the closure parts from one another, the engagement projections roll against each other. The engagement projections thus guide the tilting movement of the second closure part relative to the first closure part during automatic opening under load.
[0031] The toothing elements are shaped such that they each replicate a tooth of an (imaginary) gear and are thus shaped like a tooth of a gear. The first engagement projection is shaped like a tooth of a first gear, and the second engagement projection like a tooth of a second gear. The centers of the gears do not lie on the load axis. Rather, the center of the first gear is offset, for example, transversely to the load axis such that, when loaded, a torque acts on the second closure part in the direction of opening the closure device, and the toothing elements roll against each other, tilting the closure parts.
[0032] The body of each closure part can also be provided with several engagement projections in the form of toothed elements, which are arranged in a row, for example, along a circular line like a gear. When the second closure part tilts relative to the first closure part, the toothed elements of the closure parts roll against each other, so that the closure parts roll against each other—similar to two gears—when the closure device automatically opens under load, thereby tilting relative to each other.
[0033] In one embodiment, the first closure part has a blocking element formed on the first body, which engages with a blocking engagement arranged on the second body to block a movement of the second body away from the contact element. The blocking element blocks the second body of the second closure part relative to the first body of the first closure part, in particular counter to an engagement direction along which the engagement projections engage with one another when the closure device is closed. The engagement direction is perpendicular to the normal direction.The blocking effect of the blocking element on the first closure part is thus perpendicular to the normal direction, so that due to the engagement of the blocking element on the first closure part in the blocking engagement on the second closure part, the closure parts cannot slide tangentially with their surfaces against one another and thus the engagement projections cannot disengage from one another due to tangential movement of the closure parts to one another.
[0034] The magnetic devices of the closure parts are formed, for example, by permanent magnets, which, in the closed position of the closure device, point toward each other with opposite poles and thus magnetically attract each other. In another embodiment, one of the magnetic devices can be formed by a permanent magnet and the other by a passive magnetic armature, for example, made of a ferromagnetic material, such as iron.
[0035] The concept underlying the invention will be explained in more detail below with reference to the exemplary embodiments illustrated in the figures. They show:
[0036] Fig. 1A is a view of an embodiment of a closure device in a closed position;
[0037] Fig. 1 B is a view of the locking device when engaging a load;
[0038] Fig. 1 C is a view of the locking device, with the
[0039] Locking device under load;
[0040] Fig. 1 D is a view of the locking device during automatic opening under load;
[0041] Fig. 2A is a view of another embodiment of a locking device in a closed position; Fig. 2B is a view of the locking device when engaging a load;
[0042] Fig. 2C is a view of the locking device when the
[0043] Locking device under load;
[0044] Fig. 2D is a view of the locking device during automatic opening under load;
[0045] Fig. 3A is a view of yet another embodiment of a closure device, in a closed position;
[0046] Fig. 3B is a view of the locking device when engaging a load;
[0047] Fig. 3C is a view of the locking device when the
[0048] Locking device under load;
[0049] Fig. 3D is a view of the locking device during automatic opening under load;
[0050] Fig. 4A is a view of yet another embodiment of a closure device, in a closed position;
[0051] Fig. 4B is a view of the locking device when engaging a load;
[0052] Fig. 4C is a view of the closure device, with the
[0053] Locking device under load;
[0054] Fig. 4D is a view of the locking device during automatic opening under load;
[0055] Fig. 5A is an exploded view of another embodiment of a closure device;
[0056] Fig. 5B is a view of the locking device in a closed position;
[0057] Fig. 5C is another view of the locking device in the closed position; Fig. 6 is an enlarged view of the locking device in the closed position;
[0058] Fig. 7A is a perspective view of the closure device before closing;
[0059] Fig. 7B is a perspective view of the closure device during closing;
[0060] Fig. 7C is a view of the closure device during further closing;
[0061] Fig. 7D is a view of the locking device in the closed position;
[0062] Fig. 8A is a plan view of the arrangement according to Fig. 7A;
[0063] Fig. 8B is a plan view of the arrangement according to Fig. 7B;
[0064] Fig. 8C is a plan view of the arrangement according to Fig. 7C;
[0065] Fig. 8D is a plan view of the arrangement according to Fig. 7D;
[0066] Fig. 9A is a sectional view taken along the line DD of Fig. 8A;
[0067] Fig. 9B is a sectional view taken along the line CC of Fig. 8B;
[0068] Fig. 9C is a sectional view taken along line BB of Fig. 8C;
[0069] Fig. 9D is a sectional view taken along the line AA of Fig. 8D;
[0070] Fig. 10A is a side view of the arrangement according to Fig. 7A;
[0071] Fig. 10B is a side view of the arrangement according to Fig. 7B;
[0072] Fig. 10C is a side view of the arrangement according to Fig. 7C;
[0073] Fig. 10D is a side view of the arrangement according to Fig. 7D;
[0074] Fig. 11 A shows a view of the locking device in the closed position under load; Fig. 11 B shows a view of the locking device during automatic opening under load;
[0075] Fig. 11C is a view of the locking device during further opening under load;
[0076] Fig. 11 D is a view of the locking device when the load is opened further;
[0077] Fig. 11 E a view of the closure device, with separated closure parts;
[0078] Fig. 12A is a plan view of the arrangement according to Fig. 11A;
[0079] Fig. 12B is a plan view of the arrangement according to Fig. 11B;
[0080] Fig. 12C is a plan view of the arrangement according to Fig. 11C;
[0081] Fig. 12D is a plan view of the arrangement according to Fig. 11D;
[0082] Fig. 12E is a plan view of the arrangement according to Fig. 11E;
[0083] Fig. 13A is a sectional view taken along the line EE of Fig. 12A;
[0084] Fig. 13B is a sectional view taken along the line FF of Fig. 12B;
[0085] Fig. 13C is a sectional view taken along the line GG of Fig. 12C;
[0086] Fig. 13D is a sectional view taken along the line HH of Fig. 12D;
[0087] Fig. 14A is a side view of the arrangement according to Fig. 11A;
[0088] Fig. 14B is a side view of the arrangement according to Fig. 11B;
[0089] Fig. 14C is a side view of the arrangement according to Fig. 11C;
[0090] Fig. 14D is a side view of the arrangement according to Fig. 11D;
[0091] Fig. 14E is a side view of the arrangement according to Fig. 11E; Fig. 15A is an enlarged view of the sectional view according to Fig. 13A;
[0092] Fig. 15B is an enlarged view of the sectional view according to Fig. 13C; and
[0093] Fig. 16 is a schematic diagram of the closure parts with engagement projections formed thereon.
[0094] In an embodiment illustrated in Fig. 1A-1D, a closure device 1 comprises a first closure part 2 and a second closure part 3. The closure parts 2, 3 are placed against one another in a closed position illustrated in Fig. 1A and interact in a magnetically attractive manner via magnetic devices 22, 32, so that the closure parts 2, 3 are held together.
[0095] The first closure part 2 has a first body 20 on which a first magnetic device 22 is arranged. A contact element 21 protrudes from the body 20 along a normal direction N, which serves to support the second closure part 3 in the closed position.
[0096] The second closure part 3 has a second body 30 on which a second magnetic device 32 is arranged.
[0097] In the closed position according to Fig. 1 A, the magnetic devices 22, 32 point towards each other and attract each other magnetically, so that the bodies 20, 30 of the closure parts 2, 3 are held together.
[0098] A surface section 202, 303 is formed on each body 20, 30 of the closure parts 2, 3. The surface sections 202, 303 extend approximately perpendicular to the normal direction N and, in the closed position according to Fig. 1A, lie flat against one another.
[0099] A first force introduction point 200, for example in the form of a belt webbing receptacle for attaching a belt, is formed on the first body 20 of the first closure part 2, as can be seen in Fig. 1B. In a normal operating state, an associated component, for example a belt, engages the first force introduction point 200 and thus the first closure part 2. In contrast, a force introduction element 31, for example in the form of a bracket, is arranged on the second closure part 3 at a second force introduction point 310. In the illustrated embodiment, the force introduction element 31 can be pivoted at the force introduction point 310 relative to the body 30 of the second closure part 3, wherein an associated component, for example a belt, engages the force introduction element 31 in the normal operating state of the closure device 1.
[0100] In the loaded state, a first load force F1 acts at the force introduction point 200 and a second load force F2 acts via the force introduction element 31 at the force introduction point 310. The load forces F1, F2 are equal in magnitude and opposite to each other in the force balance, so that the closure parts 2, 3 are loaded relative to each other by the magnitude of the load force F1, F2 when the closure device 1 is loaded.
[0101] When the locking device 1 is loaded, the locking parts 2, 3 align as shown in Fig. 1C. A load axis L points through the force introduction points 200, 310. The load force F1, F2 acts linearly along the load axis L, as shown in Fig. 1C.
[0102] When the closure device 1 is loaded, as shown in Fig. 1C, the body 30 of the second closure part 3 is supported on the contact element 21 and thus held on the first closure part 2. The closure parts 2, 3 are held in contact with one another via the magnetic devices 22, 32 with the surface sections 202, 303, so that the closure parts 2, 3 are connected to one another in a load-bearing manner.
[0103] Due to the shape of the contact element 21 and the alignment of the closure parts 2, 3 relative to one another when the closure device 1 is loaded, the load force F2 at the force introduction point 310 of the second closure part 3 causes a torque on the second closure part 3, which is defined by the load force F2 and a lever arm H2 to a tilting point 210 defined by an upper edge of the contact element 21. This torque acts in the direction of opening the closure device 1.
[0104] The torque caused by the load force F2 on the closure part 3 relative to the closure part 2 is counteracted by a torque generated by the magnetic attraction force FM of the magnetic devices 22, 32, which acts with a lever arm H1 relative to the tilting point 210 on the contact element 21, as shown in Fig. 1 C.
[0105] A torque balance shows that the closure device 1 opens automatically when the load force F2 exceeds a predetermined limit force, namely when the torque caused by the load force F2 around the tilting point 210 exceeds the oppositely directed torque caused by the magnetic attraction force FM. The limit force that must be exceeded by the load force F2 for the closure device 1 to open automatically is determined by the dimensioning of the magnetic devices 22, 32 and the resulting magnetic attraction force FM, as well as by the lever ratios of the lever arms H1, H2.
[0106] If the load force F2 on the second closure part 3 causes a torque that exceeds the torque acting in the direction of holding caused by the magnetic attraction force FM, the closure device 1 opens automatically, as shown in Fig. 1 D. Upon opening, the closure part 3 tilts about the tilting point 210 along a tilting direction K, so that the surface sections 202, 303 of the bodies 20, 30 of the closure parts 2, 3 are lifted away from each other, the magnetic devices 22, 23 are moved away from each other, and the closure parts 2, 3 are thus pulled away from each other.
[0107] Because the closure parts 2, 3 open automatically under load, a safety mechanism can be provided. Thus, the closure device 1 can open particularly when a load becomes excessive and could endanger a user, for example, the risk of strangulation when using the closure device 1 on a helmet. If the load force exceeds a predetermined limit force, the closure device 1 opens automatically, so that the risk of endangering a user can at least be reduced.
[0108] Another embodiment, shown in Fig. 2A to 2D, differs from the embodiment according to Fig. 1A to 1D only in that an inclined surface 211 is formed on the contact element 21 of the first closure part 2 on a side facing the body 30 of the second closure part 2 in the closed position, which inclined surface 211 engages in the closed position with an inclined surface 300 on the body 30 of the second closure part 3. The contact element 21 is therefore undercut with respect to the normal direction N, so that additional support of the closure parts 2, 3 relative to one another along the normal direction is provided via the contact element 21.
[0109] Again, the closure parts 2, 3 align with each other under load, as shown in Fig. 2C. If the load force F2 at the force introduction point 310 of the second closure part 3 is so large that it exceeds a limit force, the closure device 1 opens automatically, as shown in Fig. 2D.
[0110] In yet another embodiment, shown in Figs. 3A to 3D, an engagement projection 212 is formed on the contact element 21, which projects from a wall section 213 of the contact element 21 transversely to the normal direction N and points towards the body 30 of the second closure part 3. In the closed position according to Fig. 3A, the engagement projection 212 engages with an associated engagement projection 301 on the body 30 of the second closure part 3, so that the engagement of the engagement projections 212, 301 with one another provides (positively locking) support for the closure parts 2, 3 along the normal direction N.
[0111] The engagement projection 212 on the contact element 21 defines a tilting point 210. If a load force F2 on the second closure part 3, which acts via the force introduction element 31 at the force introduction point 310, exceeds a predetermined limit force, which is determined by the lever ratios described with reference to Figs. 1A to 1D and the magnetic attraction force FM of the magnetic devices 22, 32, the closure device 1 opens automatically by the closure parts 2, 3 being tilted relative to one another along a tilting direction K around the tilting point 210, as shown in Fig. 3D.
[0112] In yet another embodiment, shown in Fig. 4A to 4D, a blocking element 201 in the form of a projection protruding from the surface portion 202 along the normal direction N is additionally formed on the body 20 of the first closure part 2, which blocking element 201, in the form of a projection, projects from the surface portion 202 along the normal direction N, which, in the closed position according to Fig. 4A, engages with an associated blocking engagement 302 on the surface portion 303 of the body 30 of the closure 3 and thus blocks a tangential movement of the surface portions 202, 303 perpendicular to the normal direction N in the direction of disengaging the engagement projections 212, 301, as can be seen from Fig. 4A. Again, a load force F2 on the force introduction element 31 causes the closure device 1 to open automatically if the load force F2 exceeds a predetermined limit force, as shown in Fig. 4D.
[0113] A further embodiment is shown in Fig. 5A-5C to Fig. 15A, 15B.
[0114] In the illustrated embodiment, which is functionally similar to the embodiment according to Figs. 4A to 4D, a first closure part 2 has a first body 20 forming a surface portion 202. A first magnetic device 22 in the form of a permanent magnet is arranged on the body 20. Also formed on the first body 20 is a contact element 21 which protrudes along a normal direction N from the body 20 and the surface portion 202 formed thereon, as can be seen, for example, in Fig. 5A.
[0115] In the illustrated embodiment, an engagement projection 212 in the form of a toothed element is formed on the contact element 21 on an inwardly facing side.
[0116] On the surface portion 202, a blocking element 201 is also formed in the form of a projection projecting from the surface portion 202 along the normal direction N.
[0117] An associated assembly 4, for example in the form of a belt strap, is arranged on the closure part 2 via a force introduction point 200 in the form of a belt strap receptacle on the body 20, as shown in Fig. 6.
[0118] The second closure part 3 has a body 30, on which an engagement projection 301 in the form of a toothed element is formed on a side facing the contact element 21 in the closed position. A force introduction point 310 is formed on the body 30, to which a force introduction element 31 in the form of a bracket is articulated. Also arranged on the body 30 is a second magnetic device 32 in the form of a permanent magnet, which points with an opposite pole toward the magnetic device 22 of the first closure part 2.
[0119] An actuating element 33 in the form of an actuating tab is arranged on the body 30, via which a user can manually open the closure device 1 from the closed position. On a side facing the closure part 2, the body 30 forms a surface section 303 which comes into contact with the surface section 202 when the closure device 1 is closed, as can be seen from the sequence of images according to Figs. 7A to 7D. In the closed position according to Figs. 7D, 8D, 9D and 10D, the surface sections 202, 303 of the closure parts 2, 3 lie flat against one another, wherein the closure part 3 is supported relative to the body 20 of the closure part 2 via the contact element 21 in a direction perpendicular to the normal direction N.
[0120] In addition, the engagement projections 212, 301 are in engagement with one another, so that the closure parts 2, 3 are also supported against one another in a form-fitting manner along the normal direction N, as can be seen from Fig. 10D in conjunction with the sectional view according to Fig. 9D.
[0121] In the closed position, the blocking element 201 engages on the surface portion 202 of the closure part 2 in an associated blocking engagement 302 in the form of a recess on the surface portion 303 of the body 30 of the closure part 3, as can be seen, for example, from the sectional view according to Fig. 9D, so that a tangential movement of the surface portions 202, 303 along a direction perpendicular to the normal direction N, in particular in the direction of disengagement of the engagement projections 212, 301 from one another, is blocked.
[0122] To close the closure device 1, the closure parts 2, 3 are brought closer together approximately along a closing direction X, along which the magnetic devices 22, 32 interact in a magnetically attractive manner. The closing process then occurs in the manner of a tumbling relative movement of the closure parts 2, 3 to one another, as shown in Figs. 10A to 10D.
[0123] Thus, first, an end of the body 30 of the closure part 3 facing away from the engagement projection 301 comes into contact with the surface portion 202 on the body 20 of the closure part 2, corresponding to a movement B1 according to Fig. 10B. Then, the engagement projections 212, 301 slide past one another, corresponding to a tilting movement B2 according to Fig. 10C, and then slide into engagement with one another in the sense of a movement B3, corresponding to a movement B3 according to Fig. 10D. In the closed position according to Figs. 7D, 8D, 9D and 10D, the closure parts 2, 3 are held together by the magnetic attraction of the magnetic devices 22, 32 and are also supported by the engagement of the engagement projections 212, 301. The closure parts 2, 3 are thus connected to one another in a load-bearing manner.
[0124] However, the engagement of the engagement projections 212, 301 with each other and a force introduction via the force introduction points 200, 310 when the closure device 1 is loaded in the closed position are such that the closure device 1 can open automatically under load, as shown in the sequence of Figs. 11A to 11E, 12A to 12E, 13A to 13D, and 14A to 14E. Thus, load forces F1, F2 act on the force introduction points 200, 310, which are equal in magnitude and load the closure parts 2, 3 relative to one another. The load force F2 on the force introduction element 31 and above it at the force introduction point 310 of the second closure part 3 causes the closure parts 2, 3 to tilt towards each other along a tilting direction K when the load force F2 exceeds a predetermined limit force which is determined by the magnetic attraction force of the magnetic devices 22, 32 and also by the lever ratios, analogously to what was previously described with reference to Fig.1A to 1D.
[0125] In the illustrated embodiment, the engagement projection 212 on the contact element 21 and the engagement projection 301 on the body 30 of the closure part 3 are shaped like toothed elements and have a tooth profile, for example, an involute profile, in a tilting plane defined by the tilting direction K and corresponding to the sectional plane according to Figs. 15A and 15B. If the closure parts 2, 3 are loaded relative to one another by the load force F1, F2, the engagement projections 212, 301 in the form of toothed elements roll against one another, as can be seen in the transition from Fig. 15A to Fig. 15B, so that the closure parts 2, 3 tilt towards one another along the tilting direction K and separate from one another as the magnetic devices 22, 32 are removed. The closure device 1 thus opens automatically under load when the load force F1, F2 exceeds a predetermined limit force.
[0126] The formation of the engagement projections 212, 301 by toothing elements is illustrated in a schematic diagram in Fig. 16. The engagement projection 212 is designed such that it corresponds to the shape of a tooth on an (imaginary) gear Z1 with a center point M1. The engagement projection 301 on the body 30 of the closure part 3, in contrast, is shaped like a tooth of a gear Z2 with a center point M2. A load axis L, along which the load forces F1, F2 act between the force introduction points 200, 310 when the closure device 1 is loaded, does not extend through the centers M1, M2 of both gears Z1, Z2, but in the illustrated embodiment runs with reference to the normal direction N above the center point M1 of the gear Z1, which defines the shape of the toothing element of the engagement projection 212.As a result, the load force F2 acts in the direction of rolling of the toothed element 301 on the toothed element 212, so that the closure parts 2, 3 tilt towards each other in a manner defined by the tooth shape of the engagement projections 212, 301, as can be seen in the transition from Fig. 15A to Fig. 15B.
[0127] The idea underlying the invention is not limited to the embodiments described above, but can also be implemented in other ways.
[0128] A closure device of the type described can, for example, be designed as a belt fastener for connecting two belts together.
[0129] However, a closure device of the type described can also be used, for example, on a textile garment in that one closure part is arranged on one textile assembly and the other closure part is arranged on another textile assembly in such a way that the closure parts align themselves with one another along a load axis under load.
[0130] For example, the locking device can be used on a helmet, for example a children's home, in particular a children's safety helmet, and enable emergency opening under load.
[0131] List of reference symbols
[0132] 1 locking device
[0133] 2 locking part
[0134] 20 bodies
[0135] 200 Force introduction point
[0136] 201 Blocking element
[0137] 202 area section
[0138] 21 Investment element
[0139] 210 tipping point
[0140] 211 Inclined surface
[0141] 212 engagement projection
[0142] 213 wall section
[0143] 22 Magnetic device
[0144] 3 closure part
[0145] 30 bodies
[0146] 300 inclined surface
[0147] 301 engagement projection
[0148] 302 Blocking intervention
[0149] 303 area section
[0150] 31 Force introduction element
[0151] 310 Force introduction point
[0152] 32 Magnetic device
[0153] 33 Actuating element
[0154] 4, 5 assemblies (belt)
[0155] B1-B3 Movement
[0156] F1 , F2 load force
[0157] FM Magnetic Attraction
[0158] H1 , H2 lever arm
[0159] K Tilt direction
[0160] L load axle
[0161] M1 , M2 center point
[0162] N Normal direction
[0163] X Closing direction
[0164] Z1 , Z2 Imaginary gear
Claims
Claims 1. A closure device (1) for connecting two assemblies (4, 5) to one another, comprising a first closure part (2) comprising a first body (20), a first force introduction point (200) arranged on the first body (20), a contact element (21) arranged on the first body (20), and a first magnetic device (22), a second closure part (3) comprising a second body (30), a second force introduction point (310) arranged on the second body (30), and a second magnetic device (32), and wherein the first closure part (2) and the second closure part (3) can be placed against one another to close the closure device (1) under magnetic attraction of the first magnetic device (22) and the second magnetic device (32),in a closed position, at least when the closure device (1) is loaded, the second body (30) is supported on the contact element (21) and, in order to open the closure device (1), the first closure part (2) and the second closure part (3) can be separated from one another, wherein, in the closed position, when the closure device (1) is loaded, a load force (F2) acts at the second force introduction point (310) linearly along a load axis (L) pointing through the first force introduction point (200) and the second force introduction point (310), characterized in that, when the closure device (1) is loaded, the first closure part (2) and the second closure part (3) automatically separate from one another when the load force (F2) exceeds a predetermined limit force.
2. Closure device (1) according to claim 1, characterized in that the second closure part (3) has a force introduction element (31) which is movably connected to the second body (30) at a second force introduction point (310) and on which the load force (F2) acts when the closure device (1) is loaded.
3. Closure device (1) according to claim 1 or 2, characterized in that the second body (30) is designed to automatically separate the first closure part (2) and the second closure part (3) from one another in a tilting direction (K) about a tilting point (210) on the contact element (21) relative to the first body (20) when the load force (F2) exceeds the predetermined limit force. . Closure device (1) according to claim 3, characterized in that the tilting direction (K) defines a tilting plane, wherein the load axis (L) runs in the tilting plane. . Closure device (1) according to claim 4, characterized in that the tilting point (210) is offset transversely to the load axis (L) in the tilting plane. . Closure device (1) according to one of claims 3 to 5, characterized in that in the closed position with a loaded closure device (1), a magnetic attraction force (FM) of the first magnet device (22) and the second magnet device (32) causes a first torque about the tilting point (210) on the second closure part (3), and the load force (F2) causes a second torque, opposite to the first torque, about the tilting point (210) on the second closure part (3).Closure device (1) according to claim 6, characterized in that the first closure part (2) and the second closure part (3) separate automatically from one another when the second torque is greater than the first torque. Closure device (1) according to one of the preceding claims, characterized in that the first body (20) forms a first surface section (202) and the second body (30) forms a second surface section (303), wherein the first surface section (202) and the second surface section (303) bear against one another in the closed position. Closure device (1) according to claim 8, characterized in that the magnetic attraction force (FM) of the first magnet device (22) and the second magnet device (32) acts perpendicular to the first surface section (202) in the closed position. 0.Closure device (1) according to claim 8 or 9, characterized in that the contact element (21), viewed along a normal direction (N) perpendicular to the first surface portion (202), protrudes from the first surface portion (202). Closure device (1) according to claim 10, characterized in that the second force introduction point (310) is arranged on the second body (30) in such a way that. that the second force introduction point (310), viewed along a direction perpendicular to the normal direction (N), is arranged between the contact element (21) and a center of the first magnetic device (22).
12. Closure device (1) according to claim 10 or 11, characterized in that the contact element (21) has a first engagement projection (212) projecting transversely to the normal direction (N) from a wall section (213) of the contact element (21) and the second body (30) has a second engagement projection (301), wherein the first engagement projection (212) and the second engagement projection (301) are in engagement with one another in the closed position.
13. Closure device (1) according to claim 12, characterized in that the first engagement projection (212) and the second engagement projection (301) can be tilted towards each other for automatically separating the first closure part (2) and the second closure part (3) from each other.
14. Closure device (1) according to claim 12 or 13, characterized in that the first engagement projection (212) and the second engagement projection (301) are each formed by a toothing element.
15. Closure device (1) according to claim 14, characterized in that the toothing element has an involute profile, so that the first engagement projection (212) and the second engagement projection (301) roll against each other when tilted.
16. Closure device (1) according to one of the preceding claims, characterized in that the first closure part (2) has a blocking element (201) formed on the first body (20) which engages with a blocking engagement (302) arranged on the second body (30) in order to block a movement of the second body (30) directed away from the contact element (21).