Magnetic fastening device

{
  "publication_number": "US12349758B2",
  "country": "US",
  "kind": "B2",
  "title": "Magnetic fastening device",
  "abstract": "A magnetic fastening device for releasably fastening a first unit and a second unit to each other. The first unit has a first unit abutment surface. The second unit having a second unit abutment surface. The first unit abutment surface and the second unit abutment surface are adapted for abutment against each other. The device includes at least one pair of magnets including first magnet allocated to the first abutment surface and a second magnet allocated to the second abutment surface. The first magnet and the second magnet exert an attractive force to each other. The first unit may be or include a communication device and the second unit is a helmet or a separate unit permanently fixed to a helmet.",
  "claims": [
    "1. A communication device assembly for a helmet, comprising: a communication device comprising a communication device abutment surface, a plurality of magnets allocated to the communication device, and a recess, wherein the recess comprises a first electrical contact; a receiving structure configured to be mounted to a side of a helmet, wherein the receiving structure comprises a receiving structure abutment surface, a plurality of magnets allocated to the receiving structure, and a protrusion, wherein the protrusion comprises a second electrical contact; wherein the communication device abutment surface and the receiving structure abutment surface are adapted for abutment against each other and the protrusion is received in the recess when the communication device is mounted to the receiving structure; wherein magnetic force is exerted between magnets allocated to the communication device and corresponding magnets allocated to the receiving structure when the communication device is mounted to the receiving structure; and wherein the recess and the protrusion are shaped to provide a form fit fastening between the recess and the protrusion when the communication device is mounted to the receiving structure.",
    "2. The communication device assembly of claim 1, wherein an electrical connection is established between the first electrical contact and the second electrical contact when the communication device is mounted to the receiving structure and the protrusion is within the recess.",
    "3. The communication device assembly of claim 1, wherein the protrusion is electrically connected to at least one functional component in the helmet.",
    "4. The communication device assembly of claim 3, wherein the at least one functional component comprises at least one of a microphone or a loudspeaker.",
    "5. The communication device assembly of claim 1, wherein the protrusion has a protrusion abutment surface and the recess has a recess abutment surface; and wherein magnetic force exerted between magnets allocated to the communication device and magnets allocated to the receiving structure pulls the protrusion abutment surface against the recess abutment surface.",
    "6. The communication device assembly of claim 1, wherein at least one of the magnets allocated to the communication device or at least one of the magnets allocated to the receiving structure comprises an active magnet.",
    "7. The communication device assembly of claim 1, wherein at least one of the magnets allocated to the communication device or at least one of the magnets allocated to the receiving structure comprises a passive magnet.",
    "8. The communication device assembly of claim 1, wherein the plurality of magnets allocated to the communication device comprises at least two pairs of magnets; and wherein the plurality of magnets allocated to the receiving structure comprises at least two corresponding pairs of magnets.",
    "9. The communication device assembly of claim 1, wherein the helmet comprises a motorcycle helmet.",
    "10. The communication device assembly of claim 1, wherein the communication device comprises a Bluetooth® communication device.",
    "11. A communication device assembly for a helmet, comprising: a communication device comprising a communication device abutment surface, a plurality of magnets allocated to the communication device, and a recess; a receiving structure configured to be mounted to a side of a helmet, wherein the receiving structure comprises a receiving structure abutment surface, a plurality of magnets allocated to the receiving structure, and a protrusion; wherein, when the communication device is mounted to the receiving structure, the communication device abutment surface and the receiving structure abutment surface are adapted for abutment against each other and the protrusion is configured to be received in the recess; wherein magnetic force is exerted between magnets allocated to the communication device and corresponding magnets allocated to the receiving structure when the communication device is mounted to the receiving structure; and wherein the magnets allocated to the communication device and the corresponding magnets allocated to the receiving structure are arranged such that (i) magnetic force acting in a direction normal to the communication device abutment surface and the receiving structure abutment surface maintains the abutment of the communication device abutment surface against the receiving structure abutment surface, and (ii) magnetic force extending parallel to the communication device abutment surface and the receiving structure abutment surface maintains the protrusion in the recess.",
    "12. The communication device assembly of claim 11, wherein the recess has a recess abutment surface and the protrusion has a protrusion abutment surface; and wherein the magnetic force extending parallel to the communication device abutment surface and the receiving structure abutment surface pulls said protrusion abutment surface against said recess abutment surface to maintain the protrusion in the recess.",
    "13. The communication device assembly of claim 11, wherein the recess comprises a first electrical contact and the protrusion comprises a second electrical contact; and wherein an electrical connection is established between the first electrical contact and the second electrical contact when the protrusion is within the recess.",
    "14. The communication device assembly of claim 13, wherein the protrusion is electrically connected to at least one functional component in the helmet.",
    "15. The communication device assembly of claim 14, wherein the at least one functional component comprises at least one of a microphone or a loudspeaker.",
    "16. The communication device assembly of claim 11, wherein at least one of the magnets allocated to the communication device or at least one of the magnets allocated to the receiving structure comprises an active magnet.",
    "17. The communication device assembly of claim 11, wherein at least one of the magnets allocated to the communication device or at least one of the magnets allocated to the receiving structure comprises a passive magnet.",
    "18. The communication device assembly of claim 11, wherein the plurality of magnets allocated to the communication device comprises at least three pairs of magnets; and wherein the plurality of magnets allocated to the receiving structure comprises at least three corresponding pairs of magnets.",
    "19. The communication device assembly of claim 11, wherein the helmet comprises a motorcycle helmet.",
    "20. The communication device assembly of claim 11, wherein the communication device comprises a Bluetooth® communication device."
  ],
  "description_excerpt": "The invention relates to a magnetic fastening device for releasably fastening a first unit and a second unit to each other, said first unit having a first unit abutment surface, and said second unit having a second unit abutment surface, said first unit abutment surface and said second unit abutment surface being adapted for abutment against each other, and said magnetic fastening device further comprising at least one pair of magnets, a first magnet of said pair of magnets being allocated to the first abutment surface, and a second magnet of said pair of magnets being allocated to the second abutment surface, said first magnet and said second magnet exerting an attractive force to each other.\n\nMagnetic fastening devices of the afore-mentioned type are, for example, known from magnetic whiteboards. In this case, papers or foils may be fastened to a board (constituting the first unit) made from ferromagnetic material, e.g. a ferritic steel sheet, forming the actual whiteboard by using fastening elements (constituting the second unit) comprising permanent magnets. In this case, the first unit abutment surface and the second unit abutment surface are sandwiching the paper or foil between them when abutting against each other.\n\nWith this arrangement, on the one side, the papers or foils may easily be fastened to the whiteboard. On the other side, this type of magnetic fastening is susceptible to disturbance by external forces, in particular external forces exceeding the attractive magnetic forces acting between the magnets of the at least one pair of magnets.",
  "cpc": [
    "A42B 3/04",
    "A42B 3/08",
    "A42B 3/30",
    "F16B 1/00",
    "F16B 2200/83"
  ],
  "ipc": [
    "A42B 3/08",
    "A42B 3/30",
    "F16B 1/00"
  ],
  "assignees": [
    "Cardo Systems Ltd"
  ],
  "inventors": [
    "Avram Kushnirov"
  ],
  "filing_date": "2025-02-12",
  "publication_date": "2025-07-08",
  "grant_date": "2025-07-08",
  "priority_date": "2020-11-05",
  "application_number": "US-202519051778-A",
  "family_id": "73452241",
  "cited_by_count": 1,
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}