Fastening device, head protection device having the same

Abstract

The present invention relates to a fastening device (100) for releasably fastening a functional unit (102) to a receiving unit (104) in a connecting direction. The functional unit (102) and the receiving unit (104) each have a longitudinal direction L, a transverse direction T, and a height direction H. The fastening device (100) includes at least one pair of magnets (110), at least one functional unit magnet (112) being assigned at or near a functional unit abutment surface (106), and at least one receiving unit magnet (114) being assigned at or near a receiving unit abutment surface (108). The magnets (112, 114) of the at least one pair of magnets (110) exert an attractive force on each other. According to other aspects, the present invention provides a combination of such a fastening device (100) with a functional unit (102) and a receiving unit (104), and a combination of a head protection device with a fastening unit (100).

Description

[0001] This application is a divisional application of the invention patent application with the application number 202180089136.2 and the invention title "Fastening Device, Head Protection Equipment with the Fastening Device", which is the national stage application entered on July 4, 2023, of the PCT application PCT / US2016 / 024970 filed by applicant Cardo Communication Systems on November 4, 2021. Technical Field

[0002] The present invention relates to a fastening device for releasably fastening a functional unit to a receiving unit in a connecting direction, wherein both the functional unit and the receiving unit have a longitudinal direction, a transverse direction, and a height direction, the functional unit further has a functional unit abutment surface, and the receiving unit further has a receiving unit abutment surface, and the functional unit abutment surface and the receiving unit abutment surface are adapted to abut against each other in a connected state. Background Art

[0003] It should be noted currently that a communication unit can be an example of a functional unit used in the context of the present invention. Another example can be a camera unit. Yet another example can be any sensor related to a smart helmet, such as a collision detection sensor. Yet another example can be an acoustic unit, such as an external speaker including a scheme for transmitting audio via vibration or a microphone for anti-noise cancellation. In addition, the functional unit can include a combination of multiple of the above units and / or sensors. It should also be noted that the function does not necessarily have to be a technical function. Instead, the functional unit can also provide non-technical functions, such as aesthetic functions.

[0004] For example, a fastening device of the above type is known from WO 2012 / 100061A1. Summary of the Invention

[0005] In view of WO 2012 / 100061A1, an object of the present invention is to provide a fastening device that provides reliable fastening of a functional unit to a receiving unit.

[0006] According to the present invention, this object is achieved by a fastening device of the above type, wherein the fastening device further includes at least a pair of magnets, at least one functional unit magnet is assigned at or near the functional unit abutment surface, and at least one receiving unit magnet is assigned at or near the receiving unit abutment surface, and the magnets in the at least a pair of magnets exert an attractive force on each other.

[0007] It should be noted that at least one functional unit magnet and at least one receiving unit magnet together form a pair of magnets in the at least a pair of magnets.

[0008] According to one embodiment, in the connected state of the functional unit and the receiving unit, the height directions of the functional unit and the receiving unit preferably may extend substantially parallel to the connection direction.

[0009] Magnets not only provide a very strong gravitational force when they are close to each other (e.g., separated only by a thin layer of housing material), but also provide a gravitational force of considerable strength when they are still separated from each other. Therefore, the use of at least one pair of magnets helps the user to reliably find the correct relative positioning of the functional unit and the receiving unit when bringing the functional unit close to the receiving unit, because the magnets attract each other and thus pull the functional unit relative to the receiving unit to the correct place. In other words, the magnets provide a self-centering effect. This self-centering effect will reliably connect the functional unit and the receiving unit even if the functional unit is released at a certain distance from the receiving unit, for example because the user is wearing gloves (it is easier to place the units close to each other with the fingers than for precise assembly) and / or because the user wearing head protective gear cannot see the units, so she / he only needs to keep the units close to each other. In addition, when the functional unit and the receiving unit are in their connected state, the strong gravitational force reliably holds the functional unit attached to the receiving unit. In other words, the magnets support reliable fastening in a two-fold manner.

[0010] To obtain a strong gravitational force, at least one of the functional unit magnet and the receiving unit magnet can be an active magnet, such as a permanent magnet or an electromagnet. Compared with a passive magnet, an active magnet emits a magnetic field even when not affected by an external magnetic field. According to one embodiment, rare earth magnets, preferably samarium-cobalt magnets, more preferably neodymium-samarium-cobalt magnets, can be used as permanent magnets, for example.

[0011] Although it is preferably to have two active magnets, especially two permanent magnets, especially when considering the strength of the magnetic force, it can also be considered, especially to reduce the cost of the magnetic fastening device, that one of the functional unit magnet and the receiving unit magnet is composed of a passive magnet, such as an element made at least partly of a ferromagnetic or ferrimagnetic material and magnetized by other corresponding magnets. A passive magnet emits a magnetic field only when magnetized by an active magnet.

[0012] To further improve the self-centering effect and thus the reliable fastening of the functional unit and the receiving unit, when observed along the connection direction, the positions of at least one functional unit magnet and at least one receiving unit magnet in the connected state can at least partly overlap, preferably be substantially aligned with each other.

[0013] For example, at least one functional unit magnet and / or at least one receiving unit magnet may be arranged in the assigned receiving portion, which is provided in the correspondingly assigned unit, i.e., the functional unit or the receiving unit, and is formed integrally, for example.

[0014] In the case where the functional unit includes a housing and a functional device received in the housing, it is advantageous that the fastening device includes at least two pairs of magnets, both of which are located outside the functional device to reduce the influence of the magnets on the electrical components of the functional device, especially its capacitors, and in the case where the functional device includes a communication device, the influence of the magnets on its RF antenna can be reduced. To minimize any adverse effects, it is further preferred that when observed in the longitudinal direction or the transverse direction (preferably the longitudinal direction), at least two pairs of magnets are located on opposite sides of the functional device.

[0015] In addition, at least one of the functional unit and the receiving unit may have a housing, which includes a base portion and a covering portion attached to the base portion, and the base portion includes at least a part of the abutment surface.

[0016] To further facilitate the correct positioning of the functional unit relative to the receiving unit and thus enhance the self-centering effect, the functional unit abutment surface may include at least one inclined functional unit abutment surface portion, and the receiving unit abutment surface may include at least one inclined receiving unit abutment surface portion, which is at least partially aligned with the at least one inclined functional unit abutment surface portion in the connected state of the functional unit and the receiving unit.

[0017] Preferably, at least one inclined functional unit abutment surface portion and at least one inclined receiving unit abutment surface portion may extend at substantially the same inclination angle relative to the connection direction. In addition, the inclination angle may reach at least 45°.

[0018] Of course, it is possible to consider providing a plurality of inclined functional unit abutment surface portions and / or inclined receiving unit abutment surface portions, which are different from each other in terms of their inclination (e.g., inclination direction and / or inclination angle). However, it is also feasible that at least one inclined functional unit abutment surface portion extends over at least a part of the circumference of the functional unit, preferably over the entire circumference of the functional unit, and / or at least one inclined receiving unit abutment surface portion extends over at least a part of the circumference of the receiving unit, preferably over the entire circumference of the receiving unit.

[0019] To prevent the accidental separation of the functional unit and the receiving unit, it is advantageous that the fastening device further includes at least one mechanical locking unit, which includes a functional unit locking element assigned to the functional unit and a receiving unit locking element assigned to the receiving unit, and the locking elements are adapted and intended to cooperate with each other.

[0020] According to another embodiment, at least one mechanical locking unit may be provided at each transverse side of the functional unit and the receiving unit. In this case, the two transverse sides are those sides of the functional unit and the receiving unit that are opposite to each other in the transverse direction.

[0021] If at least one mechanical locking unit is designed as a snap - locking unit, and the snap - locking unit includes at least one snap element and at least one engagement element that are adapted and intended to cooperate with each other, then when the functional unit is brought close to the receiving unit, mechanical locking can be automatically established.

[0022] For example, at least one engagement element may be provided with an engagement sliding surface and at least one snap element may be provided with a snap sliding surface. When the engagement sliding surface and the snap sliding surface slide along each other, the snap end of the snap element is elastically deflected to the locking - ready position. Once the snap sliding surface is out of contact with the engagement sliding surface, the snap end of the snap element automatically returns to its undeflected position and engages in the engagement recess of the engagement element, thereby locking the functional unit to the receiving unit.

[0023] For example, at least one snap element may include a resilient tab that connects the snap end to the correspondingly assigned unit, i.e., the receiving unit or the functional unit, preferably the receiving unit.

[0024] To prevent the resilient tab from being plastically deformed or even broken due to excessive bending, it is also recommended that: at a predetermined distance from the connection of the resilient tab to the correspondingly assigned unit, i.e., the receiving unit or the functional unit, preferably the receiving unit, a support wall element that extends substantially parallel to the resilient tab may be provided. Thus, it is ensured that the resilient tab can only be elastically deformed. The support wall element may extend at least to the same height as at least one snap element in the connection direction.

[0025] To prevent the user from inadvertently unlocking the mechanical locking unit, the functional unit may extend outward beyond at least one snap element. In this way, the user's finger cannot reach and operate at least one snap element.

[0026] To enable the functional unit to be separated from the receiving unit, the fastening device may further include a fixing element that can be transferred between a fixed position and a release position. The fixing element is adapted to prevent the functional unit from moving relative to the receiving unit in the separation direction in its fixed position, while allowing such movement in its release position. If the deflection direction of the snap end of at least one snap element extends substantially parallel to a first direction, i.e., the transverse direction or the longitudinal direction, preferably the transverse direction, then the separation direction extends substantially parallel to a second direction, i.e., the longitudinal direction or the transverse direction, preferably the longitudinal direction (i.e., substantially orthogonal to both the deflection direction and the connection direction).

[0027] Thus, in order to separate the functional unit from the receiving unit, the user must first transfer the fixing element from its fixed position to its release position, for example by using the fingers of his / her hand, such as the thumb, and then push the functional unit in the separating direction, for example by using the other fingers of his / her corresponding hand.

[0028] According to an advantageous embodiment, the fixing element can be arranged at its assigned unit, i.e., the receiving unit or the functional unit, preferably at the receiving unit, and is preferably formed integrally with its assigned unit, i.e., the receiving unit or the functional unit, preferably the receiving unit.

[0029] Furthermore, the fixing element can be formed in a U-shape. The U-shape can include, for example, two side tabs and a connecting tab connecting the side tabs. The connecting tab can extend substantially parallel to a first direction, while the side tabs extend substantially parallel to a second direction. The transferability of the fixing element between the fixed position and the release position can be provided by the resilience of the material of the fixing element, in particular the resilience of the material of the side tabs.

[0030] To prevent the fixing element from being plastically deformed or even broken due to excessive bending, it is also recommended that: the fastening device can further include a first movement limiting measure adapted to prevent the fixing element from moving beyond the fixed position and / or a second movement limiting measure adapted to prevent the fixing element from moving beyond the release position. Thus, it is ensured that the fixing element can only be elastically deformed.

[0031] At least one of the first movement limiting measure and the second movement limiting measure can include a movement limiting abutment surface provided at the fixing element and another mating movement limiting abutment surface provided at the correspondingly assigned unit, i.e., the receiving unit or the functional unit, preferably the receiving unit.

[0032] According to another embodiment of the present invention, the fastening device can further include a stop surface provided at the receiving unit and a stop mating surface provided at the functional unit, which is adapted and intended to cooperate with the stop surface to limit the movement of the functional unit relative to the receiving unit in a direction opposite to the separating direction.

[0033] Preferably, at least one of the stop surface and the stop mating surface may extend substantially orthogonally to the separation direction. The mating of the stop surface and the stop mating surface may advantageously, for example, protect at least one pair of electrical contacts provided at the functional unit and, on the other hand, protect at least one pair of electrical contacts provided on the receiving unit from excessive mechanical loads when fastening the functional unit to the receiving unit. The at least one pair of electrical contacts may be adapted to establish an electrical connection between at least one functional component (such as at least one microphone and / or at least one speaker) connected to the receiving unit and at least one functional component (such as at least one communication device and / or at least one manually operable element) included in the functional unit.

[0034] According to a preferred embodiment, the functional unit may include a communication device, such as a communication device using technology.

[0035] Furthermore, the receiving unit may be part of a head protection device or formed as a separate unit that can be operably fastened to the head protection device. It should be noted that the head protection device can generally take any design. In particular, the head protection device may include a hard shell or a soft shell. Known head protection devices including hard shells are motorcycle helmets, sports helmets, professional protection helmets (such as helmets worn by firefighters, law enforcement officers, soldiers, airplane and / or helicopter pilots, etc.). These helmets can take different designs. In particular, the helmet can be a full-face helmet, a cross helmet, an open-face helmet, a jet helmet, a skullcap, etc. Head protection devices including soft shells are used, for example, in martial arts such as boxing, taekwondo, etc.

[0036] According to another aspect, the present invention also relates to a combination of a head protection device and a fastening unit according to the above design. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be described in more detail with reference to the accompanying drawings in connection with specific embodiments, in which:

[0038] Figure 1 a fastening device in a separated state according to an embodiment of the present invention is shown;

[0039] Figure 2 a side cross-sectional view of the fastening device in a connected state is shown;

[0040] Figure 3 a detailed view of the mechanical locking unit is shown; and

[0041] Figure 4 a detailed view of the fixing element of the fastening device is shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] In Figure 1 it, the fastening device is generally denoted by reference numeral 100. The fastening device 100 is adapted and intended to releasably fasten the functional unit 102 to the receiving unit 104. Both the functional unit 102 and the receiving unit 104 are three-dimensional bodies extending in a longitudinal direction L, a transverse direction T, and a height direction H.

[0043] To fasten the functional unit 102 to the receiving unit 104, the functional unit 102 approaches the receiving unit 104 in a connection direction C extending substantially parallel to the height direction H.

[0044] The functional unit 102 has a functional unit abutment surface 106, and the receiving unit 104 has a receiving unit abutment surface 108. In the connected state of the functional unit 102 and the receiving unit 104, the functional unit abutment surface 106 and the receiving unit abutment surface 108 abut against each other and are aligned with each other. Figure 1 The functional unit 102 and the receiving unit 104 are shown separated from each other, in other words in a separated state, while Figure 2 a cross-sectional view of the functional unit 102 and the receiving unit 104 in the connected state is shown.

[0045] In addition to the functional unit abutment surface 106 and the receiving unit abutment surface 108, the fastening device 100 further includes at least one pair of magnets 110. The at least one pair of magnets 110 includes at least one functional unit magnet 112 assigned to the functional unit 102 and at least one receiving unit magnet 114 assigned to the receiving unit 104. In the Figure 2 shown connected state of the fastening device 100, the positions of at least one receiving unit magnet 114 and at least one functional unit magnet 112 are substantially aligned with each other in a plane extending substantially parallel to the longitudinal direction L and the transverse direction T. At least one functional unit magnet 112 is located in a functional unit recess 116 provided in the functional unit 102 near the functional unit abutment surface 106, while at least one receiving unit magnet 114 is located in a receiving unit recess 118 provided in the receiving unit 104 near the receiving unit abutment surface 108.

[0046] In Figure 2In the illustrated embodiment, the functional unit 102 includes two pairs of magnets 110 (112, 114), i.e., a first pair of magnets 110' located at the front end of the housing 102a of the functional unit 102 in the longitudinal direction L, that is, in front of the functional device 102b of the functional unit 102, and a second pair of magnets 110" located at the rear end of the housing 102a in the longitudinal direction L, that is, behind the functional device 102b. Based on this arrangement, the influence of the magnets on the electrical components of the functional device 102, especially its capacitors, can be reduced, and in the case where the functional device 102 includes a communication device, the influence of the magnets on its RF antenna can be reduced.

[0047] Although in this embodiment, the magnets 112, 114 in at least one pair of magnets 110 are both permanent magnets, i.e., active magnets, it should be noted that it is also possible to consider that one of the magnets may be a passive magnet, i.e., a magnet that has a magnetic field only due to being magnetized by an active magnet.

[0048] As can be seen from Figure 1 it, the functional unit abutment surface 106 includes at least one inclined functional unit abutment surface portion 106a, and the receiving unit abutment surface 108 includes at least one inclined receiving unit abutment surface portion 108a. The at least one inclined functional unit abutment surface portion 106a and the at least one inclined receiving unit abutment surface portion 108a extend at substantially the same inclination angle. As Figure 2 shown, the at least one inclined functional unit abutment surface portion 106a and the at least one inclined receiving unit abutment surface portion 108a abut against each other in the connected state. As can be seen from Figure 1 it, a plurality of inclined functional unit abutment surface portions 106a and a plurality of inclined receiving unit abutment surface portions 108a can be respectively arranged around the circumferences of the functional unit 102 and the receiving unit 104.

[0049] As can be seen from Figure 1 it, the receiving unit 104 further includes electrical contacts 120, which are adapted and intended for electrical connection to electrical mating contacts (not shown) of the functional unit 102. As is known per se, these contacts 120 and mating contacts in their connected state are intended for supplying commands input via the operating element 122 or signals derived from these commands to signal lines 124 and / or 126 that are connected to the receiving unit 104 and lead to at least one remote device (not shown).

[0050] To fasten the functional unit 102 to the receiving unit 104, the fastening device 100 includes two mechanical locking units 130, one on each side of the fastening device, at Figure 1Only one is shown. Each mechanical locking unit 130 includes a functional unit locking element 130a assigned to the functional unit 102 and a receiving unit locking element 130b assigned to the receiving unit 104.

[0051] Figure 3 is an enlarged cross-sectional view of the fastening device 100 taken along a plane spanning the transverse direction T and the height direction H and shows in more detail the design of the mechanical locking unit 130.

[0052] The mechanical locking unit 130 is designed as a snap-locking unit and includes a catch element 132 and a trap element 134. The catch element 132 is provided with a catch sliding surface 132a and a catch end 132b. The trap element 134 is provided with a trap sliding surface 134a and a catch end 134b. In addition, the functional unit 102 includes a functional part 102b that extends laterally beyond the catch element 132.

[0053] The catch element 132 further includes a resilient tab 132c that connects the catch end 132b to the assigned unit, here the receiving unit 104. To prevent excessive bending of the resilient tab 132c, a support wall element 138 is provided at a predetermined distance d from the connection of the resilient tab 132c to the assigned unit, here the receiving unit 104.

[0054] To establish the connection of the fastening device 100 as Figure 2 shown, the functional unit 102 is brought closer to the receiving unit 104 in the connection direction C. When the functional unit 102 is brought closer to the receiving unit 104, at least one pair of magnets 110 exerts an attractive force that supports the approach and causes a self-centering effect between the two units 102, 104. This self-centering effect is enhanced by the cooperation of at least one inclined functional unit surface portion 106a and at least one inclined receiving unit surface portion 108a.

[0055] In the final stage of the approaching movement, the trap sliding surface 134a and the catch sliding surface 132a of at least one mechanical locking unit 130 slide along each other, and the catch end 134b of the trap element 134 is deflected into Figure 3 the locking preparation position LPP shown by the dashed line in. This is achieved by elastically deflecting the resilient tab 132c towards the support wall element 138.

[0056] The catch sliding surface 132a and the trap sliding surface 134a slide along each other in a guided manner in the connection direction C until the catch end 132b passes the catch end 134b. Thereby, the elastic deflection of the catch end 134b is reversed, and the catch end 134b automatically returns to Figure 3The undeflected position shown. The buckle element 134 and the engagement element 132 engage with each other. In particular, the buckle end 134b engages into the engagement recess 132d. Thereby, the functional unit 102 is locked to the receiving unit 104. This process is supported by the attractive force of at least one pair of magnets 110.

[0057] By the attractive force exerted by at least one pair of magnets 110 and the snap-lock engagement of at least one mechanical locking unit 130, the functional unit 102 and the receiving unit 104 are attached to each other in the connection direction C.

[0058] From Figure 1 and Figure 2 it can be seen that the fastening device 100 further includes a fixing element 140 that fixes the functional unit 102 against separation from the receiving unit 104 in a separation direction D that extends substantially parallel to the longitudinal direction L. Figure 1 and Figure 2 shows the fixing element 140 in its fixed position.

[0059] According to the illustrated embodiment, the fixing element 140 is provided at the receiving unit 104 and is formed integrally with the receiving unit (see Figure 1 ). The fixing element 140 is formed in a U-shape and extends partially around the receiving unit 104. The fixing element 140 includes a connecting tab 140a that connects two side tabs 140b. The connecting tab 140a extends substantially in the transverse direction T, while the two side tabs 140b extend substantially in the longitudinal direction L and are attached to the receiving unit 104 by their free ends.

[0060] In the fixed position of the fixing element 140 (see Figure 4 ), its connecting tab 140a blocks any movement of the functional unit 102 in the separation direction D (see reference numeral BL).

[0061] In order to enable the functional unit 102 to be separated from the receiving unit 104 in the separation direction D, the fixing element 140 can be transferred from the fixed position SP to the Figure 4 release position RP shown by the dashed line in

[0062] The fixed position SP is defined by the cooperation of a movement-limiting abutment surface 142a provided at the fixing element 140 and a mating movement-limiting abutment surface 142b provided at the receiving unit 104. The movement-limiting abutment surface 142a and the mating movement-limiting abutment surface 142b together form a first movement-limiting measure 142. The first movement-limiting measure 142 prevents the fixing element 140 from moving beyond the fixed position SP.

[0063] In a similar manner, the release position RP is defined by the cooperation of other movement-restricting abutment surfaces 144a provided at the fixed element 140 and cooperating other movement-restricting abutment surfaces 144b provided at the receiving unit 104. The other movement-restricting abutment surfaces 144a and the other cooperating movement-restricting abutment surfaces 144b together form a second movement-restricting measure 144. The second movement-restricting measure 144 prevents the fixed element 140 from moving beyond the release position RP.

[0064] When the fixed element 140 prevents the functional unit 102 from moving relative to the receiving unit 104 in the separation direction D in its fixed position SP, a stop surface 150 provided at the receiving unit 104 (see Figure 1 ) and a stop mating surface 152 provided at the functional unit 102 prevent relative movement in the direction opposite to the separation direction D. In the connected state of the functional unit 102 and the receiving unit 104, the stop surface 150 and the stop mating surface 152 abut against each other (see Figure 2 ).

Claims

1. A fastening device for releasably fastening a functional unit to a receiving unit in a connecting direction, comprising: a functional unit including a communication device and a functional unit abutment surface; a receiving unit including a receiving unit abutment surface; wherein the functional unit abutment surface and the receiving unit abutment surface are configured to abut against each other in a connected state; at least two pairs of magnets, which are located on opposite sides of the communication device when viewed in a longitudinal direction or a transverse direction of the functional unit, wherein each pair of the magnets includes a functional unit magnet assigned at or near the functional unit abutment surface and a receiving unit magnet assigned at or near the receiving unit abutment surface, and wherein at least one of the functional unit magnets and at least one of the receiving unit magnets in at least one pair of the magnets exert an attractive force on each other; at least one snap - locking unit including a first locking element positioned on an outer surface of the functional unit and a second locking element positioned on an outer surface of the receiving unit, wherein one of the first locking element or the second locking element includes a latch element that can be deflected in a deflection direction, and the other of the first locking element or the second locking element includes an engaging element, and wherein the latch element is configured to substantially engage with the engaging element to lock the functional unit to the receiving unit; and a fixing element that can be transferred between a fixed position and a release position, wherein the fixing element is configured to (i) prevent movement of the functional unit relative to the receiving unit in a separating direction in the fixed position, and (ii) allow movement of the functional unit relative to the receiving unit in the separating direction in the release position, wherein the separating direction is substantially orthogonal to both the deflection direction and the connecting direction.

2. The fastening device according to claim 1, wherein the functional unit and the receiving unit each have a longitudinal direction, a transverse direction, and a height direction, wherein the connecting direction extends substantially parallel to the height direction, the deflection direction extends substantially parallel to the transverse direction, and the separating direction extends substantially parallel to the longitudinal direction.

3. The fastening device according to claim 1, wherein the functional unit and the receiving unit each have a longitudinal direction, a transverse direction, and a height direction, wherein the connecting direction extends substantially parallel to the height direction, the deflection direction extends substantially parallel to the longitudinal direction, and the separating direction extends substantially parallel to the transverse direction.

4. The fastening device according to claim 1, wherein at least one of the functional unit magnets or the receiving unit magnets is an active magnet.

5. The fastening device according to claim 1, wherein when viewed in the connecting direction, the positions of at least one of the functional unit magnets and at least one of the receiving unit magnets at least partially overlap in the connected state.

6. The fastening device according to claim 1, wherein the functional unit includes a housing and the communication device within the housing, and the at least two pairs of magnets are located outside the functional unit.

7. The fastening device according to claim 1, wherein the functional unit abutment surface includes at least one inclined functional unit abutment surface portion, wherein the receiving unit abutment surface includes at least one inclined receiving unit abutment surface portion, wherein the at least one inclined receiving unit abutment surface portion is in the connected state of the functional unit, and wherein the receiving unit is at least partially aligned with the at least one inclined functional unit abutment surface portion.

8. The fastening device according to claim 1, wherein the at least one snap lock includes at least one snap lock unit located on each side of the functional unit and the receiving unit.

9. The fastening device according to claim 1, wherein the engaging element includes an engaging sliding surface, wherein the fastening element includes a fastening sliding surface, and wherein the engaging sliding surface and the fastening sliding surface elastically deflect the fastening end of the fastening element to the locking ready position when sliding along each other.

10. The fastening device according to claim 9, wherein the fastening element includes a resilient tab that connects the fastening end to the correspondingly assigned unit, and the correspondingly assigned unit includes the receiving unit or the functional unit.

11. The fastening device according to claim 10, further comprising a support wall element that extends substantially parallel to the resilient tab at a predetermined distance from the connection of the resilient tab to the correspondingly assigned unit.

12. The fastening device according to claim 1, wherein the functional unit extends outward beyond the fastening element.

13. The fastening device according to claim 1, wherein the fixing element is provided at the correspondingly assigned unit of the fixing element, and the correspondingly assigned unit of the fixing element includes the receiving unit or the functional unit.

14. The fastening device according to claim 13, wherein the fixing element is formed to be substantially U-shaped.

15. The fastening device according to claim 13, wherein the fastening device further comprises one or more of the following measures: a first movement restriction measure configured to prevent the fixing element from moving beyond the fixed position; or a second movement restriction measure configured to prevent the fixing element from moving beyond the release position.

16. The fastening device according to claim 1, further comprising a stop surface provided at the receiving unit and a stop mating surface provided at the functional unit, the stop mating surface being configured to cooperate with the stop surface to limit the movement of the functional unit relative to the receiving unit in a direction opposite to the separation direction.

17. The fastening device according to claim 1, wherein the communication device comprises a communication device.

18. The fastening device according to claim 1, wherein the receiving unit is part of a head protection device or is formed as a separate unit that can be operatively fastened to the head protection device.

19. A head protection device having a fastening device, comprising: a head protection device; a fastening device, comprising: A functional unit, including a functional unit abutment surface and a communication device; and A receiving unit, forming part of or attached to the head protection device and including a receiving unit abutment surface, wherein the functional unit abutment surface and the receiving unit abutment surface are configured to abut against each other in a connected state; At least two pairs of magnets, which are located on opposite sides of the communication device when viewed in the longitudinal or transverse direction of the functional unit, wherein each pair of the magnets includes: A functional unit magnet, assigned at or near the functional unit abutment surface; and A receiving unit magnet, assigned at or near the receiving unit abutment surface, wherein the functional unit magnet and the receiving unit magnet exert an attractive force on each other; At least one mechanical locking unit includes a functional unit locking element positioned on the outer surface of the functional unit and a receiving unit locking element positioned on the outer surface of the receiving unit, wherein at least one of the mechanical locking units is configured as a snap locking unit, wherein one of the functional unit locking element or the receiving unit locking element includes a snap element and the other of the functional unit locking element or the receiving unit locking element includes a latching element, and wherein the snap element is configured to substantially engage with the latching element to lock the functional unit to the receiving unit; and A fixing element, which can be transferred between a fixed position and a release position, wherein the fixing element is configured to prevent the functional unit from moving relative to the receiving unit in a separating direction in the fixed position of the fixing element, and the fixing element allows the movement in the release position of the fixing element.

20. The head protection device according to claim 19, wherein at least one of the functional unit magnet or the receiving unit magnet is an active magnet.

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