Protective helmet and setting device for a protective helmet

Abstract

The present invention relates to a protective helmet (100) having a helmet shell (11), a holding structure (12) for holding the helmet shell (11) on the head of a user, the holding structure (12) being fastened to the helmet shell (11), an actuating means (16) for manually tightening the holding structure (12) on the head of the user, and an overload coupling (17) between the actuating means (16) and the holding structure (12). The invention further relates to a setting device (10) for the protective helmet (100) according to the invention.

Description

[0001] Safety helmet and adjustment device for a safety helmet

[0002] The present invention relates to a protective helmet for protecting the head of a user. The invention further relates to an adjustment device for adjusting a support structure for such a protective helmet.

[0003] Various safety helmets are known in the state of the art. To achieve the most effective protection and a high level of comfort, it is important to adjust a safety helmet to the individual user. Various adjustment devices are available for adjusting the safety helmet to the user's head. For example, strap systems are known by which the helmet can be fastened to the user's head and then loosened again. The adjustment of the safety helmet is usually done by the user themselves based on feel and personal preference. For children, the helmet is often adjusted by another person, such as a parent.

[0004] The object of the present invention is to provide a protective helmet and an adjustment device for the protective helmet, by means of which the adjustment process can be improved.

[0005] The above object is achieved by the patent claims. In particular, the above object is achieved by the protective helmet according to claim 1 and the adjustment device according to the independent claim. Further advantages of the disclosed technology emerge from the dependent claims, the description, and the figures. Features described in connection with the protective helmet also apply in connection with the adjustment device, and vice versa, so that with regard to the disclosure, reference is and / or can always be made to the individual aspects.

[0006] According to a first aspect of the present invention, a protective helmet is proposed. The protective helmet comprises:

[0007] - a helmet shell,

[0008] - a support structure for holding the helmet shell on the head of a user, the support structure being attached to the helmet shell,

[0009] - an actuating means for manually tightening the support structure on the user’s head and

[0010] - an overload clutch between the actuating means and the holding structure. In the context of the present invention, it was recognized that protective helmets are often adjusted unnecessarily tightly and / or too tightly or too tightly, since the user mistakenly believes that this is the only way the protective helmet is securely fastened to the head. This case occurs particularly when the user does not adjust the protective helmet on themselves, but on another person, for example a child. By means of the overload clutch, a type of self-protection can now be achieved, which reliably prevents the user from adjusting the protective helmet too tightly or too tightly on themselves or another person. The overload clutch can be implemented easily and in a space-saving manner in and / or on the protective helmet. By means of the overload clutch, the desired goal of preventing excessive force from being exerted on the head can be reliably achieved.

[0011] An overload clutch can be understood as a coupling unit designed to prevent unwanted overloads on a user's head by allowing only a limited force transmission between the actuating device and the support structure. Limited force transmission can be understood as the maximum possible force transmission and / or the maximum possible torque transmission. Once the maximum transferable force is reached, the force transmission function of the overload clutch is deactivated, particularly mechanically. This means that, above a certain force, no more force can be transmitted to the support structure via the actuating device.

[0012] The overload clutch can be configured such that a user or person can effortlessly reach the point of maximum possible force transmission when manually actuating the actuating means, for example with two fingers. In this way, the user can be given quick and reliable feedback on the current adjustment level of the support structure. In this case, the overload clutch can be understood as a clutch that enables the maximum possible force and / or a correspondingly predefined overload to be reached without causing damage. An overload clutch is therefore not understood to be a clutch that is destroyed or damaged when a predefined overload is reached. In other words, the overload clutch prevents the actuating means from a certain and / or predefined force and / or a corresponding torque being reached.The overload clutch can be understood as a slip clutch and / or a freewheel clutch. The overload clutch can be designed as a single-part or multi-part clutch. Parts of the overload clutch can be positioned directly next to one another and / or remote from one another. The holding structure can be understood as an annular or substantially annular holding structure for the upper head region of the user, for example the forehead region and / or the back of the head region. The actuating means can be configured to adapt the size of the protective helmet to the user's head by means of the holding structure. For this purpose, the actuating means can have a rotary wheel by means of which straps of the protective helmet and / or the holding structure can be adjusted in order to thereby fasten the holding structure to the user's head. The holding structure can have straps and belts that can be made of plastic and / or fabric material such as nylon and / or polyester.Padding can be provided on the inside of the support structure to increase the comfort of wearing the protective helmet. The padding can be considered part of the support structure. The support structure can be designed to be flexibly adaptable to different head shapes. This enables the protective helmet to be widely used by different users. The protective helmet, the support structure, and / or the overload clutch can have a locking mechanism to ensure that a set size of the support structure remains stable and does not change unintentionally during use of the protective helmet. The support structure can be understood as a connecting unit between the helmet shell and the user's head, with the main goal of the support structure being to ensure a secure, comfortable, and individually adjusted fit of the protective helmet on the user's head.The support structure can therefore be understood as a component by means of which the helmet shell can be attached to the user's head. The user can be understood as a person and / or a living being, in particular a human being.

[0013] A safety helmet can be a bicycle helmet, a skateboard helmet, a climbing helmet, or a construction helmet. A bicycle helmet is a safety helmet specifically designed for cyclists to protect the cyclist's head in the event of a fall or accident. A skateboard helmet is a safety helmet specifically designed for skateboarders and scooter riders to prevent injuries during falls or when performing tricks. A climbing helmet is a safety helmet designed for mountaineers and climbers to protect the helmet wearer from falling rocks and other hazards encountered while mountaineering. A construction helmet is a safety helmet worn by workers on construction sites and in other hazardous work environments to protect the head from injuries caused by falling objects or impacts.The helmet shell can be understood as the outer part of the protective helmet that protects the user's head from external influences. The helmet shell can be made of a hard, impact-resistant material. The helmet shell can be understood as an essential component of the protective helmet, serving to absorb energy and protect the head from injury in the event of a fall or impact. The helmet shell can be made of robust plastics and / or composite materials. The helmet shell can have a single-layer or multi-layer structure. The shape of the helmet shell can vary depending on the type and / or desired function of the helmet. The helmet shell can be configured to provide protection for the crown, forehead, temples, and / or the back of the head of the user.

[0014] The holding structure can be understood as an annular and / or crown-shaped holding structure and / or a holding structure that is positioned at least partially in a ring around the user's head when the protective helmet is worn as intended. The holding structure can be designed in one piece or in multiple pieces. To hold the helmet shell on the user's head, the holding structure can be fastened and / or tightened to the user's head. Using the actuating means, the holding structure can be not only tightened but also loosened. Tightening on the head can be understood as fastening to the head. Tightening the holding structure can be understood as reducing an inner diameter of the holding structure. Loosening the holding structure can be understood as enlarging an inner diameter of the holding structure.Tightening the support structure on the user's head can be understood as increasing the force exerted by the support structure on the user's head.

[0015] The actuating means can be understood as a mechanism by which the support structure on the user's head can be manually tightened and / or released. The actuating means can therefore be designed as a manual actuating means for manually tightening and manually releasing the support structure.

[0016] According to one embodiment, it is possible for the actuating means to have an adjustment wheel or to be designed as an adjustment wheel. This allows the actuating means to be implemented in a particularly simple and space-saving manner. The adjustment wheel can also enable particularly simple adjustment of the holding structure or the protective helmet. The adjustment wheel can be understood to be a rotary wheel. The adjustment wheel can be configured such that the shape of the holding structure is changed by turning the adjustment wheel. In particular, the adjustment wheel can be configured such that turning the adjustment wheel in one direction reduces the diameter of the holding structure and turning the adjustment wheel in another direction increases the diameter of the holding structure. By turning the adjustment wheel, the shape of the holding structure can be adapted to the shape of the user's head.The actuating means can be mechanically connected to the support structure via the overload clutch.

[0017] The protective helmet proposed here can further comprise a housing that defines a clutch volume, wherein at least a portion of the overload clutch is positioned in the clutch volume and the actuating means is fastened to the housing. This allows the overload clutch to be provided in a space-saving yet robust manner. The housing can be positioned and / or configured at a distance from the helmet shell. In this way, a system design can be realized in which individual components can be quickly and easily repaired and / or replaced as needed. The housing can be fastened directly or indirectly to the helmet shell. In particular, the housing can be fastened to the helmet shell by means of the holding structure. The housing can be configured as an integral part of the helmet shell. The housing can be understood as an open or closed frame structure that protects the overload clutch from environmental influences.

[0018] Furthermore, with the protective helmet proposed here, it is possible for the housing to have a guide for guiding at least part of the holding structure, and for the guide to define a guide volume in which the guided part of the holding structure is positioned. Such an extension of the housing ensures that the overload clutch is positioned particularly securely in the housing. In particular, a lateral extension of the housing by means of the guide and the part of the holding structure extending there makes it possible to achieve particularly stable fastening of the housing, in which the housing does not move or rotates only slightly during actuation of the actuating means. A lateral extension of the housing can be understood as an extension that extends in two different directions away from a base body in the shape of an arm, wherein the overload clutch is positioned in the base body or in a volume defined by the base body.The guide can be understood as a guide for a band-, belt-, and / or strap-like support structure. The coupling volume and the guide volume can be arranged next to each other, in particular directly next to each other, so that the support structure can extend from the guide volume directly to the overload clutch in the coupling volume.

[0019] The described safety helmet can further comprise a signaling unit configured to signal an overload on the overload clutch generated by the actuating means in a manner perceptible to the user of the safety helmet. By means of the signaling unit, a user of the safety helmet can quickly and reliably detect whether they are already in the overload range. This can improve the user-friendliness of the safety helmet. Reaching the overload can be signaled acoustically and / or visually. For example, the overload clutch can be configured such that an acoustically perceptible overload noise, such as rattling and / or cracking, is generated upon reaching the overload. The overload clutch can also be configured such that a visual signal, such as a color change on an outer side of the housing, for example from green to red or from blue to red, is generated upon reaching the overload.

[0020] Furthermore, it is possible for the protective helmet described here to have a one-piece and / or monolithic housing. This means that the housing, including the guide, can be designed as a one-piece and / or monolithic housing. This allows the number of components required for the protective helmet to be reduced or kept to a minimum. The protective helmet can be assembled accordingly easily. The housing can be designed as a plastic component, for example, as an injection-molded component, or as a 3D-printed component.

[0021] The protective helmet described here can have a fastening means for attaching the actuating means to the housing, wherein the housing has a housing hub and the fastening means is positioned in the housing hub in a form-fitting and / or force-fitting manner. The housing hub can be understood to be a central or substantially central housing through-opening. In this way, the actuating means can be attached to the housing simply yet securely. The fastening means can be at least partially pin-shaped, bolt-shaped, wave-shaped, and / or peg-shaped. The fastening means can have a front-face locking element for establishing a locking connection with the housing and / or the housing hub. The fastening means can have a round cross-section. The fastening means can be designed as a component of the actuating means or as an independent component.In a state in which the actuating means is attached to the housing by the fastening means, the actuating means can still be rotated non-destructively. Only a relative movement in the axial direction between the housing and the actuating means can be prevented or substantially prevented.

[0022] In the proposed protective helmet, it is also possible for the overload clutch to have a latching means and a coupling means, wherein the latching means is configured to establish a latching connection with the housing, wherein the coupling means is configured to establish a mechanical operative connection between the actuating means and the latching means, and wherein the coupling means is positioned between the actuating means and the latching means. This also enables a compact and stable construction. The latching means and the coupling means can each be designed essentially in a layered, annular, disc-shaped, and / or plate-shaped manner. This means that the latching means and / or the coupling means can be designed to be round and flat, wherein the height in an axial direction can be many times smaller than the respective maximum diameter.The locking means can have one or more, for example two, locking arms that extend outwards in a radial direction. The locking arms can be designed to be elastically deformable through appropriate dimensioning and / or material selection. The locking means can further be configured such that a locking connection can be established between the locking arms and a gear ring in the housing and / or in the housing volume. The gear ring can be designed as a component, for example as a monolithic component of the housing. The locking arms can each have a locking projection that can engage in locking recesses in the gear ring. Alternatively, the locking arms can each have a locking recess that can engage in locking projections in the gear ring.

[0023] Furthermore, in the protective helmet described here, it is possible for the fastening means to be designed as an integral and / or monolithic component of the actuating means. This enables a particularly compact and stable construction. For example, the fastening means can be pin-shaped, peg-shaped, wave-shaped and / or projection-like on the actuating means. The actuating means, including the fastening means, can be rotationally symmetrical or essentially rotationally symmetrical. Only a possible end-face locking element on the fastening means does not have to be rotationally symmetrical, but can be axially symmetrical or asymmetrical. Furthermore, it is possible for the actuating means to have an actuating means hub and for the fastening means to be positioned in the actuating means hub in a form-fitting and / or force-fitting manner.In this way, despite the actuating means being attached to the housing, a relative movement in an axial direction between the actuating means and the housing can be created. This allows for greater flexibility in creating possible variants of the overload clutch. In this case, the fastening means can be considered an independent component that can be movably mounted relative to the housing, relative to the locking means, relative to the coupling means, and / or relative to the actuating means during intended use of the safety helmet. In this case, the fastening means can also be designed in a pin-shaped, stud-shaped, and / or wave-shaped manner.

[0024] Furthermore, in the protective helmet described here, it is possible for the actuating means to have at least one radial locking element and the coupling means to have at least one radial counter-locking element, wherein the at least one radial locking element and the at least one radial counter-locking element are configured to establish an overload locking connection between the actuating means and the coupling means. This makes it possible to create the desired overload locking connection in a simple and reliable manner. The at least one radial locking element can have at least one locking projection that can engage in at least one locking recess of the at least one counter-locking element. Alternatively, the at least one radial locking element can have at least one locking recess into which at least one locking projection of the at least one counter-locking element can engage.The respective locking recess and / or the respective locking projection can be designed to be elastically deformable due to their dimensions and / or material properties. For example, the counter-locking element can have a plurality of locking recesses. The locking recesses can be designed as part of a monolithic actuating means. The locking element can have a plurality of elastically deformable, for example rubber-coated and / or spring-loaded, locking projections. The locking projections can each be understood as drivers via which force or a torque of the actuating means can be transmitted to the coupling means and consequently to the locking means and the holding structure. If the force generated by the actuating means on the coupling means becomes too great, the locking projections can be elastically deformed and / or misplaced to the extent that there is no longer any locking connection between the locking projections and the locking recesses.In this case, the actuating element can no longer transmit any greater force to the clutch element. The actuating element rotates, while the clutch element stops rotating.

[0025] According to a further embodiment of the protective helmet, it is possible for the coupling means to have a lower coupling element and an upper coupling element, wherein the lower coupling element has at least one axial locking element and the upper coupling element has at least one axial counter-locking element, wherein the at least one axial locking element and the at least one axial counter-locking element are configured to establish an overload locking connection between the lower coupling element and the upper coupling element. By dividing the coupling means into two parts and using the locking mechanism described, a compact yet reliably functioning overload coupling can be created. The at least one axial locking element can be designed as at least one axial projection that can engage in at least one axial recess of the at least one counter-locking element.The at least one axial locking element can be designed as at least one axial recess into which at least one axial projection of the at least one counter-locking element can engage. The at least one axial projection can be dome-shaped, roof-shaped and / or convex. The at least one axial recess can be pit-shaped, groove-shaped and / or concave. Several axial recesses and / or projections can be designed along an imaginary circular line on the upper and / or lower coupling element. Furthermore, it is possible for the at least one axial locking element and the at least one counter-locking element to be designed in a corresponding and / or complementary wave-shaped manner to one another, so that a wave crest of the locking element can always be positioned in a wave trough of the counter-locking element with a form-fitting fit. Until the overload or the maximum possible force is reached, the locking elements orThe shaft contours are positioned directly next to each other. If the overload limit is reached and / or exceeded, the shaft structures shift relative to each other, resulting in the upper coupling element being spaced axially from the lower coupling element, thus preventing even greater force and / or torque transmission between the two coupling elements. Accordingly, an even greater force transmission from the actuating element to the support structure can also be prevented.

[0026] In the protective helmet described here, the upper coupling element can be mounted in a manner that is secure against rotation relative to the actuating means and axially movable relative to the actuating means. This makes it easy to ensure that the upper coupling element is reliably rotated together with the actuating means, but can deflect in the direction of the actuating means and / or move away from the lower coupling element when the overload is reached. To achieve the security against rotation, the upper coupling element can have an at least partially angular and / or non-circular hub in which a complementary fastening means, for example the fastening means described above, can be positioned. This means that the fastening means can have an angular, for example rectangular, cross-section at least in the region of the hub of the upper coupling element.The anti-twist mounting of the upper coupling element can be understood as a mounting that prevents or at least inhibits relative rotation between the upper coupling element and the actuating element. The actuating element can be connected to the upper coupling element in a force-locking and / or positive-locking manner, at least with respect to one direction of rotation.

[0027] Furthermore, the protective helmet described here can have a compression spring, by means of which an axial spring pressure is or is produced between the actuating means and the coupling means. This means that the compression spring can be positioned such that the spring pressure is exerted on the actuating means and the coupling means. In this way, the coupling means and / or the coupling elements can be reliably held in the desired position for the force and / or torque transmission from the actuating means to the holding structure until the overload is reached. By selecting the spring, a desired value for the overload or the maximum possible force for the adjustment process can be easily set or selected. The compression spring can be understood as a pressure unit which generates the pressure described above between the actuating means and the coupling means depending on the force generated by the actuating means.The compression spring can be designed as a mechanical spring, for example, a disc spring, an evolute spring, or a coil spring. The compression spring can be positioned directly on the actuating means and / or directly on the coupling means.

[0028] According to a further aspect of the invention, an adjustment device for a protective helmet as described above is proposed. The adjustment device has the actuating means for manually tightening the holding structure on the user's head. Furthermore, the adjustment device has the overload clutch to establish a mechanical overload connection between the actuating means and the holding structure when the adjustment device is installed in the protective helmet. The adjustment device thus offers the same advantages as those described in detail with reference to the protective helmet. The features described with reference to the protective helmet also apply to the adjustment device. The adjustment device can have the housing, the coupling means, the fastening means, the locking means, and the features mentioned above.

[0029] Further measures will become apparent from the following description of various exemplary embodiments, which are schematically illustrated in the figures. All features and / or advantages arising from the claims, the description, or the figures, including structural details and spatial arrangements, may be significant both individually and in various combinations.

[0030] They show schematically:

[0031] Fig. 1 shows a protective helmet according to an embodiment,

[0032] Fig. 2 shows an adjusting device according to a first embodiment in an assembled state,

[0033] Fig. 3 shows an adjusting device according to a second embodiment in a disassembled state,

[0034] Fig. 4 the adjustment device according to the second embodiment in an alternative perspective,

[0035] Fig. 5 shows an adjusting device according to a third embodiment in a disassembled state,

[0036] Fig. 6 the adjustment device according to the third embodiment in an alternative perspective,

[0037] Fig. 7 shows the adjustment device according to the first embodiment in a disassembled state and Fig. 8 shows the adjustment device according to the first embodiment in an alternative perspective.

[0038] Elements with the same function and mode of operation are provided with the same reference symbols in the figures.

[0039] Fig. 1 shows a protective helmet 100 in the form of a bicycle helmet for children. The protective helmet 100 has a helmet shell 11, an annular support structure 12 for holding the helmet shell 11 on the head of a user, and an adjustment device 10. The support structure 12 is attached to the helmet shell 11. In addition, the protective helmet 100 has side straps 13, a chin strap 14, and a closure 15. The adjustment device 10 has an actuating means 16 for manually tightening the support structure 12 on the user's head and for releasing the support structure 12 from the user's head. The adjustment device 10 also has a housing 18 to which the actuating means 16 is attached. The adjustment device 10 further comprises an overload clutch 17, which is positioned in the housing 18 or in a clutch volume 19 defined by the housing 18 and between the actuating means 16 and the holding structure 12.The actuating means 16 is mechanically connected to the support structure 12 via the overload clutch 17. The actuating means 16 has an adjustment wheel that can be rotated to adjust the desired fit of the protective helmet 100 or the support structure 12.

[0040] Fig. 2 shows an adjustment device 10 according to a first embodiment in an assembled state. The illustrated adjustment device 10 comprises the housing 18 and the actuating means 16 fastened or rotatably mounted on the housing 18. The housing 18 has a guide 39 for guiding the support structure 12. The guide 39 defines a guide volume 20 in which the guided, belt-shaped part of the support structure 12 is positioned. The illustrated housing 18 is designed as a single piece.

[0041] Fig. 3 shows an adjustment device 10 according to a second embodiment in a disassembled state or in an exploded view. As shown in Fig. 3, the housing 18 defines a clutch volume 19, wherein the overload clutch 17 is positioned in the clutch volume 19 in an assembled state. Furthermore, with a view to Fig. 3, it can be seen that the actuating means 16 is fastened to the housing 18 in the assembled state. For this purpose, the adjustment device 10 has a pin-shaped fastening means 21. The fastening means 21 is designed as an integral and monolithic component of the actuating means 16. More precisely, the fastening means 21 is designed as a concentric projection of the actuating means 16. The illustrated housing 18 has a housing hub 22.The fastening means 21 has a locking element on the end face, by means of which the fastening means 21 and consequently also the actuating means 16 are non-positively positioned in the housing hub 22 in an axial direction 25. This means that, in the assembled state, the actuating means 16 can be rotated relative to the housing 18, but, apart from a certain amount of play, cannot be moved in an axial direction 25. The actuating means 16 can only be moved away from the housing 18 in the axial direction 25 by releasing the locking connection.

[0042] The illustrated overload clutch 17 has a locking means 31 and a coupling means 32. The locking means 31 is configured to establish a locking connection with the housing 18. The coupling means 32 is configured to establish a mechanical operative connection between the actuating means 16 and the locking means 31. The coupling means 32 is positioned in a layer-like manner between the actuating means 16 and the locking means 31. The locking means 31 has two locking arms 27, which extend in a circumferential direction and each have a locking lug that extends outwards in a radial direction 26. The locking arms 27 are designed to be elastically deformable or movable in the radial direction 26. The locking means 31 has two through-openings 28, in which drivers 29 of the coupling means 32 engage. The drivers 29 are designed as projections in the axial direction 25.The locking means 31 is configured such that a locking connection can be established between the locking arms 27 and a gear ring 30 of the housing. The gear ring 30 is designed as a monolithic component of the housing 18. Fig. 4 shows the adjustment device 10 according to the second embodiment in an alternative perspective. In Fig. 4, it can also be seen that the actuating means 16 has a radial locking element 35 in the form of a gear ring, and the coupling means 32 has a radial counter-locking element 36 in the form of four radial locking lugs. The radial locking element 35 and the radial counter-locking element 36 are configured to establish an overload locking connection between the actuating means 16 and the coupling means 32. For this purpose, the locking lugs are designed in the form of elastic knobs and, at a certain torque or in the event of an overload, slip out of the counter-locking element 36 or the gear ring of the actuating means 16.This creates a signaling unit by means of which an overload generated by the actuating means 16 is signaled to the overload clutch 17. This means that when the overload is reached, the actuating means acoustically signals the overload or the maximum transmission force reached by means of the gear ring rattling against the locking lugs. Fig. 5 shows an adjustment device according to a third embodiment in a disassembled state. In the third embodiment, the coupling means 32 is designed in two parts. The coupling means 32 has a lower coupling element 33 and an upper coupling element 34, wherein the lower coupling element 33 has four dome-shaped axial locking elements 37 and the upper coupling element 34 has a series of axial counter-locking elements 38 in the form of recesses.The axial locking elements 37 and the axial counter-locking elements 38 are configured to establish the desired overload locking connection between the lower coupling element 33 and the upper coupling element 34. When the overload is reached, the dome-shaped locking elements 37 move out of the axial counter-locking elements or out of the recesses. An increasing force transmission through the actuating means 16 to the holding structure 12 is then no longer possible. Fig. 6 shows the adjustment device 10 according to the third embodiment in an alternative perspective. In Fig. 6 it can also be seen that the upper coupling element 34 is mounted so as to be non-rotatable relative to the actuating means 16 and axially movable relative to the actuating means 16. For this purpose, the upper coupling element 34 has a through-opening with two through-surfaces extending parallel to one another.The fastening means 21 has a complementary outer geometry with outer surfaces which, in the assembled state, prevent relative rotation between the actuating means 16 and the upper coupling element.

[0043] Fig. 7 shows the adjustment device according to the first embodiment in a disassembled state. According to the embodiment shown in Fig. 7, the actuating means 16 has an actuating means hub 23. The fastening means 21 is positioned in the actuating means hub 23 in the assembled state. The fastening means 21 can be fastened to the actuating means 16 in this position with a screw (not shown) or screwed to it. Alternative fastening mechanisms for fastening the fastening means 21 to the actuating means 16 are possible. The adjustment device 10 shown in Fig. 7 further has a compression spring 24 for producing an axial spring pressure between the actuating means 16 and the coupling means 32. The compression spring 24 is designed as a disc spring. The locking elements of the coupling means 32 correspond to one another orComplementarily wave-shaped, so that a wave of the respective locking element can always be positioned in a wave trough of the counter-locking element. Until the overload is reached, the locking elements or the wave contours are positioned directly next to one another. If the overload is reached and / or exceeded, the wave structures shift towards one another and result in the upper coupling element 34 being spaced apart from the lower coupling element 33 in the axial direction 25 against the spring pressure or the spring force of the compression spring 24, and thus no further force and / or torque transmission can be generated between the two coupling elements. If the torque generated by the actuating means 16 decreases, the two coupling elements 33, 34 are pressed together again by the compression spring 24, so that the waves are positioned in a form-fitting manner in the wave troughs. Fig.Figure 8 shows the adjustment device 10 according to the first embodiment from an alternative perspective. The invention disclosed here allows for further design principles in addition to the illustrated embodiments. This means that the invention should not be considered limited to the exemplary embodiments explained with reference to the figures.

[0044] List of reference symbols

[0045] 10 Adjustment device

[0046] 11 Helmet shell

[0047] 12 Support structure

[0048] 13 side straps

[0049] 14 chin strap

[0050] 15 Closure

[0051] 16 Actuating means

[0052] 17 Overload clutch

[0053] 18 housings

[0054] 19 clutch volume

[0055] 20 guide volumes

[0056] 21 Fasteners

[0057] 22 Housing hub

[0058] 23 Actuator hub

[0059] 24 compression spring

[0060] 25 Axial direction

[0061] 26 Radial direction

[0062] 27 locking arm

[0063] 28 passage opening

[0064] 29 drivers

[0065] 30 sprocket

[0066] 31 rest stops

[0067] 32 coupling agents

[0068] 33 lower coupling element

[0069] 34 upper coupling element

[0070] 35 radial locking element

[0071] 36 radial counter-locking element

[0072] 37 axial locking element

[0073] 38 axial counter-locking element

[0074] 39 Leadership

[0075] 100 protective helmets

Claims

Patent claims 1. Protective helmet (100), comprising: - a helmet shell (11), - a holding structure (12) for holding the helmet shell (11) on the head of a user, wherein the holding structure (12) is attached to the helmet shell (11), - an actuating means (16) for manually tightening the holding structure (12) on the user’s head and - an overload clutch (17) between the actuating means (16) and the holding structure (12).

2. Protective helmet (100) according to claim 1, wherein the actuating means (16) has an adjustment wheel or is designed as an adjustment wheel.

3. Protective helmet (100) according to one of the preceding claims, comprising a housing (18) defining a clutch volume (19), wherein at least a part of the overload clutch (17) is positioned in the clutch volume (19) and the actuating means (16) is attached to the housing (18).

4. A protective helmet (100) according to claim 3, wherein the housing (18) has a guide (39) for guiding at least a part of the support structure (12) and the guide (39) defines a guide volume (20) in which the guided part of the support structure (12) is positioned.

5. Protective helmet (100) according to claim 4, comprising a signaling unit for signaling an overload on the overload clutch (17) generated by the actuating means (16).

6. Protective helmet (100) according to one of claims 3 to 5, wherein the housing (18) is designed in one piece and / or monolithic.

7. Protective helmet (100) according to one of claims 3 to 6, comprising a fastening means (21) for fastening the actuating means (16) to the housing (18), wherein the housing (18) has a housing hub (22) and the fastening means (21) is positioned in a form-fitting and / or force-fitting manner in the housing hub (22).

8. Protective helmet (100) according to one of claims 3 to 7, wherein the overload clutch (17) has a latching means (31) and a coupling means (32), wherein the latching means (31) is configured to establish a latching connection with the housing (18), wherein the coupling means (32) is configured to establish a mechanical operative connection between the actuating means (16) and the latching means (31), and wherein the coupling means (32) is positioned between the actuating means (16) and the latching means (31).

9. Protective helmet (100) according to claim 8, wherein the fastening means (21) is designed as an integral and / or monolithic component of the actuating means (16).

10. Protective helmet (100) according to claim 8, wherein the actuating means (16) has an actuating means hub (23) and the fastening means (21) is positively and / or non-positively positioned in the actuating means hub (23).

11. Protective helmet (100) according to one of claims 8 to 10, wherein the actuating means (16) has at least one radial locking element (35) and the coupling means (32) has at least one radial counter-locking element (36), wherein the at least one radial locking element (35) and the at least one radial counter-locking element (36) are configured to establish an overload locking connection between the actuating means (16) and the coupling means (32).

12. Protective helmet (100) according to one of claims 8 to 10, wherein the coupling means (32) comprises a lower coupling element (33) and an upper coupling element (34), wherein the lower coupling element (33) has at least one axial locking element (37) and the upper coupling element (34) has at least one axial counter-locking element (38), wherein the at least one axial locking element (37) and the at least one axial counter-locking element (38) are configured to establish an overload locking connection between the lower coupling element (33) and the upper coupling element (34).

13. Protective helmet (100) according to claim 12, wherein the upper coupling element (34) is mounted in a rotationally secure manner relative to the actuating means (16) and axially movable relative to the actuating means (16).

14. Protective helmet (100) according to one of claims 8 to 13, comprising a compression spring (24) for establishing an axial spring pressure between the actuating means (16) and the coupling means (32).

15. Adjustment device (10) for a protective helmet (100) according to one of the preceding claims, comprising: - the actuating means (16) for manually tightening the holding structure (12) on the user’s head and - the overload clutch (17) for establishing a mechanical overload connection between the actuating means (16) and the holding structure (12).

Images