Magnetic fastening device
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.
1. A magnetic fastening device for releasably fastening a first unit and a second unit to each other, comprising:
a first unit having a first unit abutment surface and a front surface;
a second unit having a second unit abutment surface, wherein the first unit abutment surface and the second unit abutment surface are adapted for abutment against each other;
at least one pair of magnets, wherein a first magnet of the at least one pair of magnets is allocated to the first abutment surface, and a second magnet of the at least one pair of magnets is allocated to the second abutment surface, wherein the first magnet and the second magnet exert an attractive force to each other;
wherein the first unit comprises a communication device;
wherein the second unit is separate from the first unit and is configured to be fixed to a helmet;
wherein at least one of the first abutment surface and the second abutment surface extends substantially parallel to a side surface of the helmet; and
wherein the front surface of the first unit is configured such that an external force acting on the front surface in a direction substantially parallel to the side surface of the helmet maintains a form fit between the first unit and the second unit.
2. The magnetic fastening device of claim 1 , wherein at least one magnet of the pair of magnets is an active magnet.
3. The magnetic fastening device of claim 2 , wherein one magnet of the pair of magnets comprises a passive magnet.
4. The magnetic fastening device of claim 1 , wherein the magnetic fastening device is free of moving parts.
5. The magnetic fastening device of claim 2 , wherein the active magnet comprises a permanent magnet or an electromagnet.
6. The magnetic fastening device of claim 3 , wherein the passive magnet comprises an element at least partly made from a ferromagnetic or ferrimagnetic material and magnetized by the respective other magnet of the pair of magnets.
7. The magnetic fastening device of claim 1 , wherein the communication device uses Bluetooth® technology.
8. A magnetic fastening device for releasably fastening a first unit and a second unit to each other, the magnetic fastening device comprising:
at least one pair of magnets, a first magnet of the at least one pair of magnets being allocated to the first unit, and a second magnet of the at least one pair of magnets being allocated to the second unit, wherein the first magnet and the second magnet exert an attractive force to each other;
wherein the first unit comprises a functional device and a front surface;
wherein the second unit is separate from the first unit and is configured to be fixed to a helmet;
wherein the first unit and the second unit extend substantially parallel to a side surface of the helmet; and
wherein the front surface of the first unit is configured such that an external force acting on the front surface in a direction substantially parallel to the side surface of the helmet maintains a form fit between the first unit and the second unit.
9. The magnetic fastening device of claim 8 , wherein at least one magnet of the pair of magnets is an active magnet.
10. The magnetic fastening device of claim 9 , wherein one magnet of the pair of magnets comprises a passive magnet.
11. The magnetic fastening device of claim 8 , wherein the magnetic fastening device is free of moving parts.
12. The magnetic fastening device of claim 9 , wherein the active magnet comprises a permanent magnet or an electromagnet.
13. The magnetic fastening device of claim 10 , wherein the passive magnet comprises an element at least partly made from a ferromagnetic or ferrimagnetic material and magnetized by the respective other magnet of the pair of magnets.
14. The magnetic fastening device of claim 8 , wherein the helmet comprises a motorcycle helmet.
15. The magnetic fastening device of claim 8 , wherein the functional device is a communication device.
16. The magnetic fastening device of claim 15 , wherein the communication device uses Bluetooth® technology.
17. A magnetic fastening device for releasably fastening a first unit and a second unit to each other, comprising:
a first unit having a first unit abutment surface and a front surface;
a second unit having a second unit abutment surface, wherein the first unit abutment surface and the second unit abutment surface are adapted for abutment against each other;
at least one pair of magnets, wherein a first magnet of the at least one pair of magnets is allocated to the first abutment surface and a second magnet of the at least one pair of magnets is allocated to the second abutment surface, wherein the first magnet and the second magnet exert an attractive force to each other;
wherein at least one protrusion is provided on one of the first unit and the second unit;
wherein at least one recess is provided in each of the first unit and the second unit, the at least one recess being adapted to receive the at least one protrusion of a respective other of the first unit and the second unit;
wherein the second unit comprises a helmet, or a separate unit configured to be fixed to the helmet;
wherein at least one of the first abutment surface and the second abutment surface extends substantially parallel to a side surface of the helmet; and
wherein the front surface of the first unit is configured such that an external force acting on the front surface in a direction substantially parallel to the side surface of the helmet maintains a form fit between the first unit and the second unit.
18. The magnetic fastening device of claim 17 , wherein the first magnet and the second magnet are displaced relative to each other by a displacement distance in a displacement direction, in a state in which the at least one protrusion is received in the at least one recess, a component of the attractive force and the external force maintaining said at least one protrusion in the at least one recess.
19. The magnetic fastening device of claim 17 , wherein at least one magnet of the pair of magnets is an active magnet.
20. The magnetic fastening device of claim 19 , wherein one magnet of the pair of magnets comprises a passive magnet.
21. The magnetic fastening device of claim 17 , wherein the first unit comprises a functional device.
22. The magnetic fastening device of claim 19 , wherein the active magnet comprises a permanent magnet or an electromagnet.
23. The magnetic fastening device of claim 20 , wherein the passive magnet comprises an element at least partly made from a ferromagnetic or ferrimagnetic material and magnetized by the respective other magnet of the pair of magnets.
24. The magnetic fastening device of claim 21 , wherein the functional device comprises a communication device.
25. The magnetic fastening device of claim 24 , wherein the communication device uses Bluetooth® technology.