DK178643B1 - A magnet protector, a method for adapting a magnet protector and use thereof - Google Patents

A magnet protector, a method for adapting a magnet protector and use thereof Download PDF

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Publication number
DK178643B1
DK178643B1 DKPA201570149A DKPA201570149A DK178643B1 DK 178643 B1 DK178643 B1 DK 178643B1 DK PA201570149 A DKPA201570149 A DK PA201570149A DK PA201570149 A DKPA201570149 A DK PA201570149A DK 178643 B1 DK178643 B1 DK 178643B1
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DK
Denmark
Prior art keywords
magnet
protector
magnetic
contact surface
ferromagnetic material
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DKPA201570149A
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Danish (da)
Inventor
Lars Birkkjær Nielsen
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Your Global Solution Aps
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Priority to DKPA201570149A priority Critical patent/DK178643B1/en
Priority to PCT/DK2016/050063 priority patent/WO2016146129A1/en
Publication of DK201570149A1 publication Critical patent/DK201570149A1/en
Application granted granted Critical
Publication of DK178643B1 publication Critical patent/DK178643B1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0205—Magnetic circuits with PM in general
    • H01F7/0221—Mounting means for PM, supporting, coating, encapsulating PM

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

Disclosed is a magnet protector (1) comprising at least one protector contact surface (2) arranged to form contact with a magnet contact surface (3) of a magnet (4). The magnet protector also comprises releasable fixation means (5) arranged to releasably hold the at least one protector contact surface (2) and the magnet contact surface (3) together and position means (6) arranged to substantially prevent relative displacement between the magnet protector and the magnet (4) at least in one direction in a contact plane formed by the at least one protector contact surface (2). Furthermore, the magnet protector comprises a guard surface (7) arranged opposite the at least one protector contact surface (2), wherein properties of the magnet protector (1) are defined in accordance with one or more magnetic properties of the magnet (4) to reduce the magnetic attraction force at the guard surface (7). A method for adapting a magnet protector (1) for use on a magnet (4), a method for mounting a magnet (4) on a mounting surface (18) comprising ferromagnetic material and use of a magnet protector (1) is also disclosed.

Description

A MAGNET PROTECTOR, A METHOD FOR ADAPTING A MAGNET PROTECTOR AND USE
THEREOF
Field of the invention
The invention relates to a magnet protector comprising at least one protector contact surface arranged to form contact with a magnet contact surface of a magnet. The invention also relates to a method for adapting a magnet protector for use on a magnet, a method for mounting a magnet on a mounting surface comprising ferromagnetic material and use of a magnet protector.
Background of the invention
It is known that magnets can be used for mounting devices, arrangements and equipment - such as lamps, ladders, signs, gangways, scaffolds and platforms - on structures - such as ships, metal reinforced buildings, metal towers, pressure tanks or other - made from or at least containing ferromagnetic material.
However, when large objects are mounted by means of magnets, the magnets have to be relatively strong and in such case there is a risk of getting a body part - such as a finger, a toe, a hand, a foot or even an arm or a leg - caught between the mounting surface and the magnet. And besides being painful this can lead to tissue damage or even crushing of the stuck body part - particularly in relation with magnets generating a magnetic field of a great strength.
From WO 03/088167 it is known to cover a magnet on a smoke detector mounting device with a cap.
An object of the invention is therefore to provide for an advantageous technique for protecting against personal injury in relation with a magnet.
The invention
The invention provides for a magnet protector comprising at least one protector contact surface arranged to form contact with a magnet contact surface of a magnet. The magnet protector also comprises releasable fixation means arranged to releasably hold the at least one protector contact surface and the magnet contact surface together and position means arranged to substantially prevent relative displacement between the magnet protector and the magnet at least in one direction in a contact plane formed by the at least one protector contact surface. Furthermore, the magnet protector comprises a guard surface arranged opposite the at least one protector contact surface, wherein properties of the magnet protector are defined in accordance with one or more magnetic properties of the magnet to reduce the magnetic attraction force at the guard surface.
Defining properties of the magnet protector in relation to one or more magnetic properties of the magnet is advantageous in that this will reduce or eliminate the risk of personal injury or unintended mounting of the magnet, in that it enables that the specific magnet protector can be specifically adapted to the specific magnet - onto which it is to be attached - e.g. so that the strength of the magnetic field, as measured at the guard surface, does not exceed a certain level e.g. as defined in local and/or national laws or regulations.
Furthermore, it is advantageous to provide the magnet protector with releasable fixation means and position means so that the magnet protector’s position on the magnet is relatively fixed during normal use. This will reduce the risk of the magnet protector accidentally being removed or tom off the magnet e.g. during handling.
The term “fixation means” is in this context to be understood as any kind of screws, bolts, adhesives, matching meshing parts, special fittings or other kinds of fixation devices suited for releasably holding the at least one protector contact surface and the magnet contact surface together so that the protector contact surface and the magnet contact surface may easily be separated again. The term “fixation means” also includes arranging ferromagnetic material in the magnet protector so that the protector contact surface and the magnet contact surface are held together by means of magnetic attraction forces.
The term “position means” is in this context to be understood as any kind of screws, bolts, adhesives, matching meshing parts or surfaces, special fittings or other kinds of position holding devices suited for substantially preventing relative displacement between the magnet protector and the magnet in the contact plane.
In an aspect of the invention, the properties of the magnet protector comprise a field reducing distance between the guard surface and the protector contact surface.
The force of a magnet is drastically reduced the further away from the magnet it is measured. It is therefore advantageous to adapt the distance between the guard surface and the protector contact surface in accordance with one or more magnetic properties of the magnet - either by adjusting this distance on a specific magnet protector or by choosing a specific magnet protector having the desired distance between the guard surface and the protector contact surface.
In an aspect of the invention, the field reducing distance is between 1 and 500, preferably between 5 and 100 and most preferred between 15 and 50 millimetres times a factor equivalent to the strength of the magnetic field at the magnet contact surface of the magnet as measured in Tesla.
If the field reducing distance becomes too small the risk of crushing between the guard surface - of a magnet protector mounted on a magnet - and e.g. a steel surface is increased. However, if the field reducing distance becomes too big, the magnet protector becomes so large that it is difficult to handle and the risk of accidentally tearing it off the magnet during use is increased. The present distance ranges therefore provide for an advantageous relationship between functionality and safety.
It should also be noted that it is advantageous to multiply the distance of the mentioned ranges with a factor equivalent to the strength of the magnetic field at the magnet contact surface in that the required field reducing distance is dependent on the strength of the specific magnet.
In an aspect of the invention, the properties of the magnet protector comprise guard distance adjusting means for adjusting a field reducing distance between the guard surface and the protector contact surface.
Providing the magnet protector with guard distance adjusting means for adjusting a field reducing distance is advantageous in that it hereby is possible to easily adjust the field reducing distance of a given magnet protector in relation to a given magnet so that the strength of the magnetic field as measured at the guard surface does not exceed a certain level.
In an aspect of the invention, the properties of the magnet protector comprise magnetic field shielding material arranged at or between the guard surface and the protector contact surface.
Arranging magnetic field shielding material or adjusting the amount of magnetic field shielding material arranged between the magnet and the guard surface is an easy way of adjusting the strength of the magnetic field as measured at the guard surface so that it does not exceed a certain level.
In an aspect of the invention, the releasable fixation means comprises an amount of ferromagnetic material.
Since the magnet protector inherently is designed for use on a magnet it is advantageous to fix the magnet protector on the magnet by means of the magnetic attraction forces of the magnet since these means are readily available.
In an aspect of the invention, the properties of the magnet protector comprise amount adjusting means arranged for adjusting the amount of ferromagnetic material.
It is obviously important that there is no crushing risk between the magnet protector and the magnet. On the other hand it is also important that the magnet protector is relatively firmly fixed to the magnet. It is therefore advantageous that the amount of ferromagnetic material in the magnet protector can be adjusted in relation to the specific magnet.
In an aspect of the invention, the amount adjusting means comprises one or more washer means made at least partly from steel.
Metal washers are readily available and therefor simple and inexpensive means for adjusting the amount of ferromagnetic material in the magnet protector.
The term “washer means” is in this context to be understood as any kind of disc, plate, block, ring, mass or other kinds of washer suited for substantially acting as an adjustable amount of ferromagnetic material in a magnet protector.
In an aspect of the invention, the amount adjusting means comprises releasable connection means - such as a screw or a bolt - for connecting the one or more washer means to the magnet protector.
Releasable connection means are readily available and therefor simple and inexpensive means for use in relation with adjusting the amount of ferromagnetic material in the magnet protector.
In an aspect of the invention, except for the amount of ferromagnetic material the magnet protector is formed from a non-ferromagnetic material.
Forming the magnet protector from a non-ferromagnetic material - such as wood, plastic, composite material, certain metals or other - is advantageous in that it hereby is ensured that the magnet protector itself is not magnetised or attracted to the magnet.
In an aspect of the invention, the properties of the magnet protector comprise ferromagnetic material distance adjusting means of the releasable fixation means arranged for adjusting a ferromagnetic material distance between the amount of ferromagnetic material and the at least one protector contact surface.
Providing the magnet protector with ferromagnetic material distance adjusting means is advantageous in that it hereby easily is possible to adjust how hard the magnet protector is attracted to a given magnet.
In an aspect of the invention, the magnet is a rare-earth magnet.
Rare-earth magnets - such as neodymium (Nd2Fe14B) and samarium-cobalt (SmCo5) magnets - are strong permanent magnets made from alloys of rare earth elements. A characteristic of rare-earth magnets is that they are extremely brittle. It is therefore particularly advantageous to use a magnet protector according to the present invention in relation with rare-earth magnet in that the magnet protector hereby also will protect the brittle magnet from being damaged during handling.
In an aspect of the invention, the magnet protector is hollow.
Forming the magnet protector substantially hollow is advantageous in that it reduces its weight and thereby simplifies handling. Furthermore, the hollow property enables that magnetic field shielding material, tools, equipment or other can be stored in the hollow space.
In an aspect of the invention, the one or more magnetic properties of the magnet comprise a size of the strength of a magnetic field at the magnet contact surface of the magnet and in an aspect of the invention, the one or more magnetic properties of the magnet comprise a size of the density of the magnetic energy at the magnet contact surface of the magnet.
It is advantageous to define properties of the magnet protector in accordance with the strength of the magnet and/or the density of the magnetic energy at the magnet in that it hereby is easier to adapt the magnet protector e.g. so that the magnetic attraction force at the guard surface can be reduced to a desired level.
In an aspect of the invention, the position means comprises one or more position means magnet surfaces on the magnet and one or more position means protector surfaces on the magnet protector, wherein at least some of the one or more position means magnet surfaces and at least some of the one or more position means protector surfaces are meshing.
Hereby is achieved an advantageous embodiment of the invention.
In an aspect of the invention, an outer contour of the protector contact surface is adapted to substantially match an outer contour of the magnet contact surface.
Forming the magnet protector so that its shape substantially matches the shape of the magnet is advantageous in that it reduces the risk of the magnet protector being tom off the magnet by accident during handling.
In an aspect of the invention, the position means are arranged to substantially prevent relative displacement between the magnet protector and the magnet in substantially any direction on the contact plane.
Substantially fixing the magnet protector and the magnet against mutual displacement in any direction in the contact plane is advantageous in that the risk of accidentally exposing the magnet contact surface e.g. during handling hereby is reduced.
The invention further provides for a method for adapting a magnet protector for use on a magnet, the method comprising the steps of: • obtaining information regarding a strength of a magnetic field at a magnet contact surface of the magnet, and • adjusting an amount of ferromagnetic material in or on the magnet protector in accordance with the strength of the magnetic field, and/or • adjusting a field reducing distance between an amount of ferromagnetic material in or on the magnet protector and at least one protector contact surface of the magnet protector in accordance with the strength of the magnetic field, wherein the at least one protector contact surface is arranged to form contact with the magnet contact surface during normal use of the magnet protector.
Adjusting the amount of ferromagnetic material in the magnet protector and/or adjusting the distance between the ferromagnetic material and the protector contact surface in accordance with information regarding the strength of the magnetic field of the magnet - either measured or obtained in another way - is advantageous in that it hereby is possible to adjust the attraction force between a given magnet protector and a given magnet - e.g. to reduce the crushing risk between the two, to ensure that the magnet protector is firmly attached to the magnet during use, to ensure that the magnet protector can easily be removed from the magnet or other.
In an aspect of the invention, the magnet protector is a magnet protector according to any of the previously mentioned embodiments of magnet protectors.
Even further the invention provides for a method for mounting a magnet on a mounting surface comprising ferromagnetic material, the method comprising the steps of: • placing a protector contact surface of a magnet protector on a magnet contact surface of the magnet, • releasably securing the magnet protector on the magnet, • bringing the magnet comprising the magnet protector in proximity of the mounting surface, and • removing the magnet protector from the magnet before bringing the magnet in contact with the mounting surface.
Providing a magnet protector according to the present invention on a magnet during handling is advantageous in that it reduces the risk of crushing during handling -particularly between the magnet and the mounting surface. And it reduces the risk of accidental mounting during handling.
In an aspect of the invention, the magnet protector is a magnet protector according to any of the previously mentioned embodiments of magnet protectors.
In an aspect of the invention, the magnet protector is adapted for use on the magnet by means of a method according to any of the previously mentioned methods.
Also the invention provides for use of a magnet protector according to any of the previously mentioned embodiments of magnet protectors for protecting against crush hazard.
In an aspect of the invention, the magnet protector is used on a rare-earth magnet. A characteristic of rare-earth magnets is that they are extremely strong. The risk of personal injury in relation with handling rare-earth magnets is therefore particularly pronounced and it is therefore particularly advantageous to use a magnet protector according to the present invention in relation with rare-earth magnets.
Figures
An embodiment of the invention will be described, by way of non-limiting example, in the following with reference to the figures in which:
Fig. 1 illustrates schematically an embodiment of a magnet protector in contact with a magnet, as seen from the side,
Fig. 2 illustrates the magnet protector of Fig. 1 in more details, as seen from above, from the side and from below,
Figs. 3a to 3c illustrate the magnet protector of Fig. 2 separated into a magnet protector body and lid, as seen from the side and from above,
Fig. 4 illustrates a component attached to a mounting surface of a structure by use of magnets, as seen from the side,
Fig. 5 illustrates method steps in use of a magnet protector together with a magnet,
Figs. 6a and 6b illustrate a detailed embodiment of a magnet protector including fixation and adjusting means in a partial cross-sectional side view of the magnet protector,
Fig. 6c illustrates a partial cross-sectional side view of the magnet protector in another embodiment, and
Figs. 7 to 9 illustrate further embodiments of a magnet protector.
Detailed description
Fig. 1 schematically illustrates an embodiment of a magnet protector 1 in contact with a magnet 4, as seen from the side.
The magnet 4 is illustrated as a substantially box shaped permanent magnet 4 with a magnet contact surface 3 on one side and connection means 8 attached to the opposite side. The connection means 8 allow the magnet 4 to be mechanically connected to a component (not illustrated in the figure) e.g. by bolting the connection means to the component via matching holes in the connection means and the component.
The magnet protector 1 is preferably made from plastic material e.g. using a thermoplastic injection moulding process. A protector contact surface 2 of the magnet protector 1 is in contact with the magnet contact surface 3 of the magnet 4. Position means 6 of the magnet protector 1 preferably enclose and/or engage parts of the magnet 4 to substantially prevent relative displacement between the magnet protector 1 and magnet 4 at least in one direction in the contact plane. Position means 6 may for example be walls which enclose the magnet 4 on two or more sides or at least one central elevated area of the protector contact surface 2 which engages a corresponding indentation in the magnet contact surface 3 of the magnet 4. The magnet 4 and the magnet protector 1 meet and engage in the position means 6 at surface areas 16, 17.
The magnetic properties of the magnet 4 will engage with a magnetic attraction force toward a structure of ferromagnetic material when the magnet contact surface 3 is in proximity of the ferromagnetic material.
The distance FRD from the protector contact surface 2 to the guard surface 7 on the opposite side of the magnet protector 1 acts as an air gap for the magnet 4 and ensures a reduction of the magnetic attraction force at the guard surface 7.
Fig. 2 illustrates the magnet protector of Fig. 1 in more details, as seen from above, from the side and from below but without a magnet 4.
The upper figure illustrates the magnet protector 1, as seen from the side, with position means 6 including the two opposite walls ready for enclosing and engaging the magnet 4. The upper surface 17 of the central elevated area 9 in the protector contact surface 2 is ready to engage the inner surface of an indentation in the magnet contact surface 3. Further, the opposite protector contact surface 2 and guard surface 7 are separated by a distance FRD as mentioned above.
The center figure illustrates magnet protector 1, as seen from above, with the central elevated area 9 illustrated as of a substantially four-sided shape rising up of the protector contact surface 2. The surface 2 also comprises two depression areas 19 wherein the head part of a releasable fixation means 5 is visible in each area.
The releasable fixation means 5 may for example be a screw or a bolt.
The lower figure illustrates the guard surface 7 of the magnet protector 1 wherein the surface is illustrated as substantially even and uninterrupted.
Figs. 3a - 3c illustrate the magnet protector 1 of Fig. 2 separated into a magnet protector body 15 and magnet protector lid 14, as seen from the side and from above, by removing the releasable fixation means 5 (not illustrated in the figures).
Fig. 3a illustrates the magnet protector body 15 and magnet protector lid 14 together, as seen from the side, after the separation has been performed. The separation of the magnet protector 1 especially reveals the two depression areas 19 below the surface of the magnet protector lid 14.
Fig. 3b illustrates the magnet protector lid 14, as seen from above, wherein the openings are provided in the bottom of the two depression areas 19 for entering releasable fixation means 5.
Fig. 3c illustrates the magnet protector body 15, as seen from above, wherein the inner surfaces of the body walls are provided with a number of vertical supports 22 for supporting the peripheral parts of the magnet protector lid 14 from below. Vertical supports 21 are also provided in the central part of the magnet protector body for supporting the lid 14 in a corresponding central part from below.
Fig. 3c also illustrates two vertical tubes 20 which stretch up from the floor of the magnet protector body 15 and end just below the two depression areas 19 in the lid. The vertical tubes 20 preferably comprise internal threads corresponding to external threads of the releasable fixation means 5.
When the magnet protector 1 is assembled with magnet protector body 15 and lid 14 it is possible to enter the releasable fixation means 5 into the internal threads of the vertical tubes 20 via the two depression areas 19 in the lid 14 which will be further detailed in Fig. 6a and 6b in connection with an embodiment of the invention.
Figs. 3a-c illustrate a hollow embodiment of a magnet protector 1 with the possibility of separating the magnet protector body 15 and lid 14. The embodiment of the magnet protector 1 is especially advantageous for a thermoplastic injection moulding process.
Fig. 4 schematically illustrates an application with a component 24 attached to a mounting surface 18 of a structure 23 by use of magnets 4, as seen from the side.
The component 24 is illustrated as being suspended on the vertical mounting surface 18 using magnets 4 in both ends of the component. Connection means 8 of the magnets 4 ensure the connection to the component and the magnets 4 hold the component in place as the structure 23 is made of ferromagnetic material. The ferromagnetic material ensures that the magnets have the necessary magnetic attraction force when the magnet contact surfaces are in contact with the mounting surface 18.
Fig. 5 illustrates method steps in use of a magnet protector 1 together with the magnet 4 e.g. in suspending a component as illustrated in Fig. 4.
The initial method step includes a magnet 4 without a magnet protector 1 such as a magnet 4 freshly delivered from a manufacturing plant or unprotected for other reasons. The magnet 4 is brought in contact with a magnet protector 1 as schematically illustrated above the arrow labelled 1.
The next method step illustrated above the arrow labelled 2 includes the protected magnet 4 and the magnet protector 1 forming a single unit by the contact of surfaces. The single unit may easily be handled as the magnetic attraction force at the guard surface 7 is reduced in relation to the magnetic attraction force at the magnet contact surface 3 because of the distance FRD (not illustrated in the Figure).
The single unit of the protected magnet 4 and magnet protector 1 is moved to the location of a component 24 and connected via the connection means 8 of the magnet to the component 24 which is illustrated in the method step above the arrow labelled 3.
The final method step in the Figure illustrates that the component 24 with the single unit of the protected magnet 4 and magnet protector 1 has arrived at the site of the structure 23 which the component is to be suspended at a mounting surface 18 by use of the magnet 4. The method step includes the removal of the magnet protector 1 from the magnet 4 allowing the magnet contact surface 3 to come in direct contact with the mounting surface 18 (as illustrated in Fig. 4).
The removed magnet protector 1 may be reused in protecting another magnet or the magnet protector may be disposed of.
Figs. 6a - 6c illustrate detailed embodiments of a magnet protector 1 including releasable fixation means 5 in a partial cross-sectional side view of the magnet protector.
Fig. 6a illustrates magnet protector 1, as seen from above, with the central elevated area 9 and two depression areas 19 in the protector contact surface 2. The magnet protector 1 is partly divided by a center line A - A stretching from side to side but without dividing the releasable fixation means 5 in the two depression areas 19 as illustrated in more details in Fig. 6b.
Fig. 6b illustrates a partial cross-sectional side view of the magnet protector 1 and an enlarged view of a section with a releasable fixation means 5 in the magnet protector 1.
The Figure illustrates the field reducing distance FRD between the protector contact surface 2 and the guard surface 7.
The Figure also illustrates the releasable fixation means 5 in the magnet protector 1 as two screws keeping the magnet protector lid 15 fixed to the magnet protector body 14.
The side view of the magnet protector 1 especially illustrates the two depression areas 19 and the releasable fixation means 5 located in the areas wherein the means are not illustrated as divided by the centre line for explanative purpose.
The releasable fixation means 5 are illustrated in the enlarged section of the Figure with an amount of adjusting means 11 such as one or more washer means 12. The number of washers may be altered in relation to the amount of ferromagnetic material necessary for holding a magnet in contact with the protector contact surface 2. Further, the number of washers may be changed in order to reduce or increase the ferromagnetic material distance FMD between the protector contact surface 2 and the upper point of the releasable fixation means 5.
The enlarged section illustrates an embodiment comprising a screw 13 as the releasable fixation means 5 with the screw head located in the depression areas 19 in a ferromagnetic material distance FMD below the protector contact surface 2. The distance FMD is defined by the thickness FWD of four washers 12 lifting the screw head over the bottom of the depression area while the external screw thread 25 still enters the internal thread in a vertical tube 20 of the magnet protector body 14 via an opening in the bottom of the depression area.
Fig. 6c illustrates a partial cross-sectional side view of the magnet protector 1 in another embodiment.
The embodiment illustrates a magnet protector 1 with a magnet protector body 14 and magnet protector lid 15 hold together with releasable fixation means 5 located in depression areas 19.
The field reducing distance FRD between the protector contact surface 2 and the guard surface 7 is defined by the thickness of the magnet protector lid 15 wherein the lid has an increased thickness in comparison with the lid illustrated in Fig. 6b to achieve the necessary field reduction. Lids with different thicknesses may be used as guard distance adjusting means 26 wherein the appropriate field reducing distance FRD for a magnet may be achieved by choosing a lid with a particular lid thickness.
Other types of guard distance adjusting means 26 are also possible in order to alter the field reducing distance FRD between the protector contact surface 2 and the guard surface 7 such as inserts adapted for being located between the magnet protector body and lid in reducing or increasing the distance.
Figs. 7-9 illustrate further embodiments of the magnet protector 1.
Fig. 7 illustrates a partial cross-sectional side view of an embodiment of the magnet protector 1 with ferromagnetic material distance adjusting means 28 in the magnet protector 1.
Ferromagnetic material distance adjusting means 28 are illustrated in the embodiment as two nuts which may be screwed up or down on a vertical tube having an external thread. The vertical tube is extending from the bottom of the magnet protector body 14 and meets the inner surface of the magnet protector lid 15. The nuts are locked in a given position by being screwed against each other. The magnet protector lid 15 is releasably fixated to the magnet protector body 14 via the illustrated sloping edges of the upper walls of the magnet protector body which engage peripheral parts of the lid such as two opposite edges of the lid.
Fig. 8 illustrates another embodiment of the magnet protector 1 in a partial cross-sectional side view wherein the magnet field from the magnet 4 at the guard surface 7 is reduced by a magnetic field shielding material 27 in the magnet protector 1. The magnetic field shielding material 27 is illustrated as having an external connection to a ground potential for a magnet field as a path of low resistance for the magnetic field. In another embodiment the magnetic field shielding material 27 could comprise metal plates or simular for diverting the magnetic field.
The embodiment is also illustrated with a very small field reducing distance FRDvs between the magnet contact surface 2 and guard surface 7 in suggesting the reduction effect in the magnetic field at the guard surface 7 by the magnetic field shielding material 27.
Fig. 9 illustrates two embodiments of the magnet protector body 14 where the field reducing distance FRD of the bodies is different. The upper version of the magnet protector body 14 has a smaller field reducing distance FRDs which will reduce the magnet field at the guard surface 7 less than the larger field reducing distance FRD1 of the lower version of the magnet protector body 14. The manner of choosing between different sizes of magnet protector bodies 14 for adapting a magnet protector 1 to a magnet with a specific magnetic field strength is similar to the embodiment in Fig. 6c illustrating a lid with a particular lid thickness.
The invention has been exemplified above with reference to specific examples of a magnet protector 1 and especially examples of a magnet protector body 14, lid 15, fixation and adjusting means 5, 11-13 as well as amount of ferromagnetic material 10. However, it should be understood that the invention is not limited to the particular examples described above but may be designed and altered in a multitude of varieties within the scope of the invention as specified in the claims.
List 1. Magnet protector 2. Protector contact surface 3. Magnet contact surface 4. Magnet 5. Releasable fixation means 6. Position means in a magnet protector such as walls or elevated area 7. Guard surface 8. Connection means for the magnet 9. Elevated area in the protector contact surface of a magnet protector 10. Amount of ferromagnetic material 11. Amount adjusting means 12. Washer means 13. Releasable connection means 14. Magnet protector body 15. Magnet protector lid 16. Position means magnet surfaces 17. Position means protector surfaces 18. Mounting surface 19. Depression areas in the protector contact surface of a magnet protector 20. Vertical tubes with internal threads in the magnet protector body 21. Vertical supports in the magnet protector body for supporting the central part of the lid 22. Vertical supports in the magnet protector body for supporting the peripheral parts of the lid 23. Structure with a mounting surface 24. Component to be attached to a structure by use of magnets 25. Thread part of the connection means 26. Guard distance adjusting means 27. Magnetic field shielding material 28. Ferromagnetic material distance adjusting means FRD. Field reducing distance FMD. Ferromagnetic material distance FWD. Distance/thickness of ferromagnetic material such as washer means

Claims (20)

1. Magnetbeskytter (1), som omfatter mindst én beskytterkontaktoverflade (2), som er indrettet med henblik på at danne kontakt med en magnetkontaktoverflade (3) af en magnet (4), et frigørligt fastgørelsesmiddel (5), som er indrettet til frigørligt at holde nævnte mindst én beskytterkontaktoverflade (2) og nævnte magnetkontaktoverflade (3) sammen, et positioneringsmiddel (6), som er indrettet til i det væsentlige at forhindre relativ forskydning mellem nævnte magnetbeskytter (1) og nævnte magnet (4) i det mindste i én retning i et kontaktplan dannet af nævnte mindst ene beskytterkontaktoverflade (2), og en beskyttelsesoverflade (7), som er anbragt modstående nævnte mindst ene beskytterkontaktoverflade (2), hvor egenskaber af nævnte magnetbeskytter (1) defineres i overensstemmelse med en eller flere af nævnte magnets (4) magnetiske egenskaber med henblik på at reducere den magnetiske tiltrækningskraft ved nævnte beskyttelsesoverflade (7).A magnetic protector (1) comprising at least one protective contact surface (2) adapted to contact a magnetic contact surface (3) of a magnet (4), a releasable fastener (5) arranged for releasable holding together at least one protective contact surface (2) and said magnetic contact surface (3), a positioning means (6) adapted to substantially prevent relative displacement between said magnetic protector (1) and said magnet (4) one direction in a contact plane formed by said at least one protective contact surface (2) and a protective surface (7) disposed opposite said at least one protective contact surface (2), wherein properties of said magnetic protector (1) are defined in accordance with one or more of the the magnetic properties of said magnet (4) to reduce the magnetic attractiveness of said protective surface (7). 2. Magnetbeskytter (1) ifølge krav 1, hvor nævnte magnetbeskytters (1) nævnte egenskaber omfatter en feltreduktionsafstand (FRD) mellem nævnte beskyttelsesoverflade (7) og nævnte beskytterkontaktoverflade (2).Magnetic protector (1) according to claim 1, wherein said properties of said magnetic protector (1) comprise a field reduction distance (FRD) between said protective surface (7) and said protective contact surface (2). 3. Magnetbeskytter (1) ifølge krav 2, hvor nævnte feltreduktionsafstand (FRD) er mellem 1 og 500, fortrinsvis mellem 5 og 100 og navnlig mellem 15 og 50 millimeter gange en faktor svarende til magnetfeltets styrke ved nævnte magnets (4) nævnte magnetkontaktoverflade (3) målt i tesia.Magnetic protector (1) according to claim 2, wherein said field reduction distance (FRD) is between 1 and 500, preferably between 5 and 100 and in particular between 15 and 50 millimeters times a factor corresponding to the strength of the magnetic field at said magnetic contact surface (4). 3) measured in thesia. 4. Magnetbeskytter (1) ifølge et hvilket som helst af de foregående krav, hvor nævnte magnetbeskytters (1) nævnte egenskaber omfatter et beskyttelsesafstandsjusteringmiddel (26) til justering af en feltreduktionsafstand (FRD) mellem nævnte beskyttelsesoverflade (7) og nævnte beskytterkontaktoverflade (2).Magnetic protector (1) according to any of the preceding claims, wherein said properties of said magnetic protector (1) comprise a protection distance adjusting means (26) for adjusting a field reduction distance (FRD) between said protective surface (7) and said protective contact surface (2). . 5. Magnetbeskytter (1) ifølge et hvilket som helst af de foregående krav, hvor nævnte magnetbeskytters (1) nævnte egenskaber omfatter magnetfeltafskærmningsmateriale (27), som er anbragt på eller mellem nævnte beskyttelsesoverflade (7) og nævnte beskytterkontaktoverflade (2).Magnetic protector (1) according to any of the preceding claims, wherein said properties of said magnetic protector (1) comprise magnetic field shielding material (27) disposed on or between said protective surface (7) and said protective contact surface (2). 6. Magnetbeskytter (1) ifølge et hvilket som helst af de foregående krav, hvor nævnte frigørlige fastgørelsesmiddel (5) omfatter en mængde af ferromagnetisk materiale (10).Magnetic protector (1) according to any one of the preceding claims, wherein said releasable fastener (5) comprises an amount of ferromagnetic material (10). 7. Magnetbeskytter (1) ifølge krav 6, hvor nævnte magnetbeskytters (1) nævnte egenskaber omfatter et mængdejusteringsmiddel (11), som er indrettet til at justere nævnte mængde af ferromagnetisk materiale (10).The magnetic protector (1) of claim 6, wherein said properties of said magnetic protector (1) comprise a quantity adjusting means (11) adapted to adjust said amount of ferromagnetic material (10). 8. Magnetbeskytter (1) ifølge krav 7, hvor nævnte mængdejusteringsmiddel (11) omfatter et eller flere skivemidler (12), som er fremstillet i det mindste delvist af stål.The magnetic guard (1) of claim 7, wherein said quantity adjusting means (11) comprises one or more disc means (12) made at least partially of steel. 9. Magnetbeskytter (1) ifølge krav 8, hvor nævnte mængdejusteringsmiddel (11) omfatter et frigørligt forbindelsesmiddel (13) - såsom en skrue eller en bolt - til at forbinde nævnte ene eller flere skivemidler (12) med nævnte magnetbeskytter (1).Magnetic protector (1) according to claim 8, wherein said quantity adjusting means (11) comprises a releasable connecting means (13) - such as a screw or bolt - for connecting said one or more disc means (12) with said magnetic protector (1). 10. Magnetbeskytter (1) ifølge et hvilket som helst af kravene 6-9, hvor nævnte magnetbeskytter (1), bortset fra nævnte mængde af ferromagnetisk materiale (10), er dannet af et ikke-ferromagnetisk materiale.Magnetic protector (1) according to any one of claims 6-9, wherein said magnetic protector (1), apart from said amount of ferromagnetic material (10), is formed of a non-ferromagnetic material. 11. Magnetbeskytter (1) ifølge et hvilket som helst af kravene 6-10, hvor nævnte magnetbeskytters (1) nævnte egenskaber omfatter et ferromagnetisk materialeafstandsjusteringsmiddel (28) af nævnte frigørlige fastgørelsesmiddel (5), som er indrettet til at justere en ferromagnetisk materialeafstand (FMD) mellem nævnte mængde af ferromagnetisk materiale (10) og nævnte mindst ene beskytterkontaktoverflade (2).Magnetic protector (1) according to any one of claims 6-10, wherein said properties of said magnetic protector (1) comprise a ferromagnetic material distance adjusting means (28) of said releasable fastening means (5) adapted to adjust a ferromagnetic material distance ( FMD) between said amount of ferromagnetic material (10) and said at least one protective contact surface (2). 12. Magnetbeskytter (1) ifølge et hvilket som helst af de foregående krav, hvor nævnte magnet (4) er en sjælden jordart-magnet (4).Magnetic protector (1) according to any one of the preceding claims, wherein said magnet (4) is a rare earth magnet (4). 13. Magnetbeskytter (1) ifølge et hvilket som helst af de foregående krav, hvor nævnte magnetbeskytter (1) er hul.Magnetic protector (1) according to any one of the preceding claims, wherein said magnetic protector (1) is hollow. 14. Magnetbeskytter (1) ifølge et hvilket som helst af de foregående krav, hvor nævnte magnets (4) nævnte ene eller flere magnetiske egenskaber omfatter en størrelse på styrken af et magnetfelt ved nævnte magnets (4) nævnte magnetkontaktoverflade (3).Magnetic protector (1) according to any one of the preceding claims, wherein said one or more magnetic properties of said magnet (4) comprise a magnitude of the strength of a magnetic field at said magnetic contact surface (3) of said magnet (4). 15. Magnetbeskytter (1) ifølge et hvilket som helst af de foregående krav, hvor nævnte magnets (4) nævnte ene eller flere magnetiske egenskaber omfatter en størrelse på tætheden af den magnetiske energi ved nævnte magnets (4) nævnte magnetkontakto verflade (3).Magnetic protector (1) according to any one of the preceding claims, wherein said one or more magnetic properties of said magnet (4) comprise a magnitude of the density of the magnetic energy at said magnetic contact surface (3) of said magnet (4). 16. Magnetbeskytter (1) ifølge et hvilket som helst af de foregående krav, hvor nævnte positioneringsmiddel (6) omfatter en eller flere positioneringsmiddelmagnetoverflader (16) på nævnte magnet (4) og en eller flere positioneringsmiddelbeskytteroverflader (17) på nævnte magnetbeskytter (1), hvor i det mindste nogle af nævnte ene eller flere positioneringsmiddelmagnetoverflader (16) og i det mindste nogle af nævnte ene eller flere positioneringsmiddelbeskytteroverflader (17) er i indgreb.Magnetic protector (1) according to any of the preceding claims, wherein said positioning means (6) comprises one or more positioning means magnetic surfaces (16) on said magnet (4) and one or more positioning means protecting surfaces (17) on said magnetic protectors (1). wherein at least some of said positioning means magnetic surface (16) and at least some of said one or more positioning means protecting surfaces (17) are engaged. 17. Magnetbeskytter (1) ifølge et hvilket som helst af de foregående krav, hvor et ydre omrids af nævnte beskytterkontaktoverflade (2) er tilpasset til i det væsentlige at svare til et ydre omrids af nævnte magnetkontaktoverflade (3).Magnetic protector (1) according to any one of the preceding claims, wherein an outer outline of said protective contact surface (2) is adapted to correspond substantially to an outer outline of said magnetic contact surface (3). 18. Magnetbeskytter (1) ifølge et hvilket som helst af de foregående krav, hvor nævnte positioneringsmiddel (6) er indrettet til i det væsentlige at forhindre relativ forskydning mellem nævnte magnetbeskytter (1) og nævnte magnet (4) i det væsentlige i en hvilken som helst retning på nævnte kontaktplan.Magnetic protector (1) according to any of the preceding claims, wherein said positioning means (6) is arranged to substantially prevent relative displacement between said magnetic protector (1) and said magnet (4) in substantially any any direction on said contact plane. 19. Fremgangsmåde til tilpasning af en magnetbeskytter (1) til anvendelse på en magnet (4), hvilken fremgangsmåde omfatter følgende trin: • opnåelse af oplysninger om en styrke af et magnetfelt ved en magnetkontaktoverflade (3) af nævnte magnet (4), og • justering af en mængde af ferromagnetisk materiale (10) i eller på nævnte magnetbeskytter (1) i overensstemmelse med nævnte styrke af nævnte magnetfelt, og/eller • justering af en feltreduktionsafstand (FRD) mellem en mængde af ferromagnetisk materiale (10) i eller på nævnte magnetbeskytter (1) og mindst én beskytterkontaktoverflade (2) af nævnte magnetbeskytter (1) i overensstemmelse med nævnte styrke af nævnte magnetfelt, hvor nævnte mindst ene beskytterkontaktoverflade (2) er indrettet til at danne kontakt med nævnte magnetkontaktoverflade (3) under normal anvendelse af nævnte magnetbeskytter (1).A method of fitting a magnetic protector (1) for use on a magnet (4), comprising the steps of: obtaining information about the strength of a magnetic field at a magnetic contact surface (3) of said magnet (4), and • adjusting an amount of ferromagnetic material (10) in or on said magnetic protector (1) according to said strength of said magnetic field, and / or • adjusting a field reduction distance (FRD) between an amount of ferromagnetic material (10) in or on said magnetic protector (1) and at least one protective contact surface (2) of said magnetic protector (1) in accordance with said strength of said magnetic field, wherein said at least one protective contact surface (2) is arranged to contact said magnetic contact surface (3) under normal use of said magnetic protector (1). 20. Fremgangsmåde ifølge krav 19, hvor nævnte magnetbeskytter (1) er en magnetbeskytter (1) ifølge et hvilket som helst af kravene 1-18.The method of claim 19, wherein said magnetic protector (1) is a magnetic protector (1) according to any of claims 1-18.
DKPA201570149A 2015-03-16 2015-03-16 A magnet protector, a method for adapting a magnet protector and use thereof DK178643B1 (en)

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