EP3422887B1 - Helm mit schutzauskleidung - Google Patents
Helm mit schutzauskleidung Download PDFInfo
- Publication number
- EP3422887B1 EP3422887B1 EP17760965.8A EP17760965A EP3422887B1 EP 3422887 B1 EP3422887 B1 EP 3422887B1 EP 17760965 A EP17760965 A EP 17760965A EP 3422887 B1 EP3422887 B1 EP 3422887B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- liner
- cellular
- anisotropic
- rigid foam
- protective helmet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000001681 protective effect Effects 0.000 title claims description 16
- 230000001413 cellular effect Effects 0.000 claims description 96
- 239000006260 foam Substances 0.000 claims description 55
- 238000007906 compression Methods 0.000 claims description 26
- 230000006835 compression Effects 0.000 claims description 26
- 230000004888 barrier function Effects 0.000 claims description 10
- 230000004044 response Effects 0.000 claims description 7
- 229920006254 polymer film Polymers 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 230000001788 irregular Effects 0.000 claims 1
- 230000035515 penetration Effects 0.000 claims 1
- 229920000642 polymer Polymers 0.000 description 23
- 230000001133 acceleration Effects 0.000 description 22
- 239000010410 layer Substances 0.000 description 17
- 210000004027 cell Anatomy 0.000 description 9
- 239000000725 suspension Substances 0.000 description 8
- 238000013016 damping Methods 0.000 description 6
- 210000004556 brain Anatomy 0.000 description 4
- 238000000280 densification Methods 0.000 description 4
- 230000000116 mitigating effect Effects 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 208000030886 Traumatic Brain injury Diseases 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009863 impact test Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 230000009529 traumatic brain injury Effects 0.000 description 2
- 241001503987 Clematis vitalba Species 0.000 description 1
- 208000035874 Excoriation Diseases 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 208000029028 brain injury Diseases 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
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- 238000007907 direct compression Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
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- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 210000003625 skull Anatomy 0.000 description 1
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- 238000009423 ventilation Methods 0.000 description 1
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Images
Classifications
-
- A—HUMAN NECESSITIES
- A42—HEADWEAR
- A42B—HATS; HEAD COVERINGS
- A42B3/00—Helmets; Helmet covers ; Other protective head coverings
- A42B3/04—Parts, details or accessories of helmets
- A42B3/10—Linings
- A42B3/12—Cushioning devices
- A42B3/124—Cushioning devices with at least one corrugated or ribbed layer
-
- A—HUMAN NECESSITIES
- A42—HEADWEAR
- A42B—HATS; HEAD COVERINGS
- A42B3/00—Helmets; Helmet covers ; Other protective head coverings
- A42B3/04—Parts, details or accessories of helmets
- A42B3/06—Impact-absorbing shells, e.g. of crash helmets
- A42B3/062—Impact-absorbing shells, e.g. of crash helmets with reinforcing means
- A42B3/063—Impact-absorbing shells, e.g. of crash helmets with reinforcing means using layered structures
- A42B3/064—Impact-absorbing shells, e.g. of crash helmets with reinforcing means using layered structures with relative movement between layers
Definitions
- Embodiments herein relate to a protective liner, such as for use in helmets and other articles.
- Contemporary helmets are primarily designed to protect a skull from fracture during impact.
- the brain is however most sensitive to rapid head rotation, or rotational acceleration, which is readily caused by an oblique impact to the head.
- US 2015/047110 discloses a helmet with a shock absorbing liner.
- a protective helmet comprising an anisotropic cellular liner (101) with a compressive stiffness that is lower in-plane than out-of-plane, an adjacent liner (102) made of rigid foam, wherein the anisotropic liner (101) is at least partially recessed and confined in the rigid foam liner (102) to prevent global translation of the anisotropic liner (101) relative to the rigid foam liner (102); and characterized in that a barrier layer (103) is provided between said anisotropic liner (101) and adjacent foam liner (102) so that the anisotropic cellular liner (101) floats relative to the adjacent foam liner (101) and can translate relative thereto.
- Coupled may mean that two or more elements are in direct physical contact. However, “coupled” may also mean that two or more elements are not in direct contact with each other, but yet still cooperate or interact with each other.
- a phrase in the form "A/B” or in the form “A and/or B” means (A), (B), or (A and B).
- a phrase in the form "at least one of A, B, and C” means (A), (B), (C), (A and B), (A and C), (B and C), or (A, B and C).
- a phrase in the form "(A)B” means (B) or (AB) that is, A is an optional element.
- Embodiments herein employ a novel strategy based on a floating cellular liner that acts as a torsional suspension system to dampen rotational acceleration, such as head acceleration in a helmet, in response to an oblique impact.
- the torsional suspension consists of an anisotropic cellular liner that is at least partially recessed inside a rigid polymer foam shell, relative to which the cellular liner can simultaneously undergo translation and in-plane compression.
- Embodiments herein provide an impact absorption system that acts as a torsional suspension system for use in protective helmets to shield the head from linear and rotational accelerations.
- a brain is particularly vulnerable to rotational head accelerations, but contemporary helmets lack an effective mechanism to dampen rotational head accelerations in oblique impacts.
- the helmets disclosed herein include a torsional suspension consisting of an anisotropic cellular liner that is at least partially recessed in an adjacent shell made of rigid expanded polymer foam. The cellular liner is separated from the polymer shell by polymer film, or another barrier layer, to create a floating cellular liner that can translate relative to the adjacent polymer shell.
- an oblique impact to the helmet will cause relative sliding between the cellular liner and the polymer shell, simultaneously to in-plane compression of the cellular liner.
- this simultaneous in-plane compression and sliding will absorb torsional energy to reduce rotational head acceleration.
- Embodiments herein provide protective helmets designed to lessen the amount of harmful acceleration (both straight linear and rotational) that reaches the brain of a wearer during an impact to the helmet.
- the helmets may include the torsional suspension system for both cushioning and absorbing linear and rotational energy, thus reducing peak acceleration or deceleration of a wearer's head in an impact.
- this reduction in head acceleration and deceleration may result in a corresponding reduction in the magnitude of acceleration or deceleration experienced by the brain, reducing the risk and/or severity of traumatic brain injury (TBI).
- TBI traumatic brain injury
- the helmets disclosed herein may include a torsional suspension consisting of an anisotropic cellular liner that is at least partially recessed in an adjacent shell made of expanded polymer foam.
- the cellular liner is separated from the polymer shell, such as by a polymer film, to facilitate relative sliding.
- an oblique impact to the helmet will cause relative sliding between the cellular liner and the polymer shell, simultaneously to in-plane compression of a portion of the cellular liner.
- this simultaneous in-plane compression and sliding will absorb torsional energy to reduce rotational head acceleration.
- the cellular liner is retained within the recess of the polymer shell without the necessity of using additional fasteners, adhesive etc.
- the cellular liner is sized to fit snug within the recess and to be retained within the recess as a friction fit with the shell or foam.
- only a minor amount of pressure is used to reduce the size of the cellular liner, temporarily, to place it within the recess. Once the pressure is released, the cellular liner presses against the side walls of the recess and remains in place. By eliminating additional fasteners, adhesive, etc., translation of the cellular liner within the recess is not encumbered.
- the cellular liner may also compress in a direction normal to its surface to deplete impact energy directed normal to the helmet surface.
- the cellular liner may also shear in part by folding or sideways collapse of its cellular structure to further mitigate torsional and normal impact loads.
- the cellular liner may be comprised of a lightweight aluminum structure.
- a lightweight aluminum structure such as cardboard or paper pulp, various synthetic or natural foams, plastic, polymers, and the like.
- the cellular liner may be comprised of a cell geometry with auxetic properties to allow for spherical deformation of the cellular liner without distorting the regular cell geometry.
- the cellular liner may be shaped to fit into curved recesses, as would be typical of many helmets and other articles.
- the torsional suspension system of the helmets disclosed herein may be used to construct any type of protective headgear, such as safety helmets, motorcycle helmets, bicycle helmets, ski helmets, lacrosse helmets, hockey helmets, football helmets, batting helmets for baseball and softball, headgear for rock and mountain climbers, headgear for boxers, construction helmets, helmets for defense and military applications, and headgear for underground activities.
- protective headgear such as safety helmets, motorcycle helmets, bicycle helmets, ski helmets, lacrosse helmets, hockey helmets, football helmets, batting helmets for baseball and softball, headgear for rock and mountain climbers, headgear for boxers, construction helmets, helmets for defense and military applications, and headgear for underground activities.
- helmets are described with respect to particular embodiments herein, various features herein are applicable to other articles, such as other types of protective gear, such as face masks, elbow pads, knee pads, shoulder pads, shin guards, and the like, potential impact surfaces such as various surfaces (internal or external) of a vehicle, including a dashboard and crushable surfaces on automotive brake pedals.
- embodiments described herein may also be used in association with soles of safety shoes that would dampen the impact in case of a fall from height.
- FIG. 1A illustrates a cross-sectional view of an example of the impact damping system shown in a simplified manner (flat) without the spherical curvature of helmets or shapes of other articles to illustrate certain basic concepts.
- the impact damping system 100 is comprised of an anisotropic cellular liner 101 that is partially recessed inside an adjacent liner 102 made of rigid polymer foam.
- a barrier layer 103 is located at the interface between cellular liner 101 and rigid foam liner 102 to facilitate gliding of the cellular liner 101 parallel to rigid foam liner 102. This layer 103 also prevents cells 104 of cellular liner 101 from penetrating into the surface of foam liner 102, which would restrict relative sliding between cellular liner 101 and the foam liner 102.
- Recess 105 provides a geometric constraint of at least a part of the periphery of the cellular liner, with recess 105 having both a base surface and side walls defining the recess or pocket in which the cellular liner fits and is constrained.
- layer 103 may be constrained within the pocket by interaction with recess 105 or by affixation, such as adhesive, or it may be a coating, or, in other embodiments, layer 103 may essentially be free to move, but be constrained within recess 105 by the presence of cellular liner 101 in recess 105.
- FIG. 1B illustrates the same cross-sectional view of Fig. 1A , but during impact with a spherical object 106 in an oblique direction 108 that subjects the cellular liner 101 to in-plane compression, out-of-plane compression, and shear.
- In-plane compression of cellular liner 101 is evident by cell densification in section 109 between the impact location and the geometric constraint 110. This densification is caused by the recess in the rigid foam liner 102, which prevents translation of the boundary of cellular liner 101.
- section 111 of cellular liner 101 does not exhibit in-plane compression, since it translates relative to the rigid foam liner 102, in a direction away from geometric constraint 105.
- the gliding interface provided by layer 103 in combination with the geometric constraints 105 and 110 of the recessed cellular liner enables partial in-plane compression of only a section 109 of the cellular liner 101 in response to an oblique impact 108.
- Out-of-plane compression and shear deformation of cellular liner 101 primarily occurs at the impact site between sections 109 and 111, and contributes to impact energy dissipation by crumpling and shear folding of cells 107 similar to a traditional crumple zone.
- this impact damping system delivers a unique combination of impact damping strategies to absorb normal and tangential impact forces during an oblique impact. It dampens the impact load component that acts parallel to cellular liner 101 by in-plane compression of a section 109 of cellular liner 101. It dampens the impact load component that acts perpendicular to cellular liner 101 by out-of-plane compression of cellular liner 101 at the vicinity of the impact location 107. It furthermore supports shear deformation of cellular liner 101 in the vicinity of impact location 107.
- Cellular liner 101 has anisotropic properties with a compressive stiffness that is lower in-plane than out-of-plane. Consequently, the in-plane compression caused by considerable gliding and densification of cellular liner 101 is considerably greater than the out-of-plane compression of cellular liner 101 at impact location 107.
- a barrier layer may be a film, sheet, or coating, such as polymer film.
- FIG. 2A illustrates a cross-sectional view of a helmet with an example of the impact damping system.
- the impact damping system 200 is comprised of an anisotropic cellular liner 201 that is partially recessed inside an adjacent liner 202 made of rigid polymer foam.
- a barrier layer 203 is located at the interface between cellular liner 201 and rigid foam liner 202 to facilitate gliding of the cellular liner 201 parallel to rigid foam liner 202.
- Recess 204 provides a geometric constraint along at least a part of the periphery of cellular liner 201.
- cellular liner 201 may have a hexagonal cell geometry, or an auxetic cell geometry which allows for spherical deformation of the cellular liner while retaining a regular cell geometry.
- outer helmet layer 106 may be sufficiently stable, rigid, and/or non-compressible to distribute impact forces over an extended area.
- helmets in accordance with the present disclosure may include additional features, such as a cage for a hockey helmet, a face mask for a football helmet, a visor for a motorcycle helmet, and/or retention straps, chin straps, and the like.
- cellular liner 201, foam liner 202, and plastic film may include one or more ventilation openings to permit air flow for cooling the wearer's head.
- the cell walls of cellular liner 201 may have geometric perturbations that facilitate shear deformation and in-plane compression of cellular liner 201.
- FIG. 2B illustrates the same cross-sectional view of Fig. 2A , but during an external oblique impact 209.
- This impact compresses the helmet onto the wearer's head 205 and subjects the cellular liner 201 to oblique loading 207 that is absorbed by in-plane compression, out-of-plane compression, and localized shear of cellular liner 201.
- In-plane compression of cellular liner 201 occurs to the left side of the impact location, as depicted by cell densification of cellular liner 201 that is pushed against geometric constraint 204.
- cellular liner 201 translates relative to the rigid polymer foam liner 202, creating an area 208 in the recessed foam liner 202 that is void of the cellular liner 201.
- the tangential component of impact 209 is absorbed by in-plane compression of cellular liner 202, whereby in-plane compression is distributed over a large area of cellular liner 202, extending considerably beyond the zone of impact.
- the radial component of the impact 209 is absorbed by out-of-plane compression and shear in the vicinity of the impact location, albeit the resulting deformation of the cellular liner is not shown in the illustrated embodiment.
- FIG. 3 illustrates an alternative embodiment, whereby two or more cellular liners 301 are placed in corresponding recess areas in the rigid polymer foam liner 302.
- Each individual cellular liner 301 is separated from foam liner 302 by a barrier layer 303 located at the interface between cellular liners 301 and rigid foam liner 302 to facilitate gliding of the cellular liners 301 relative to rigid foam liner 302.
- FIGS. 2A and 2B illustrate a single/unitary cellular liner.
- the unitary cellular liner extends across a substantial portion of the underlying surface area, such as at least 50%, at least 60%, or at least 70% of the surface.
- the underlying surface area can be defined as the inward facing surface of the foam liner, wherein the foam liner has an inward facing surface (facing toward the wearer) and an outward facing surface (facing away from the wearer).
- the underlying surface area can be defined as the outward facing surface of the foam liner.
- the cellular liner may be present between the foam liner and an outer hard shell.
- FIG. 4 illustrates the same cross-sectional view of Fig. 2A , but with the addition of a inner liner 405 made of a softer foam or textile material to provide improved fit and comfort for the helmet wearer.
- Inner liner 505 may also serve to prevent skin abrasion that otherwise could be caused during impact by direct compression of cellular liner 401 onto the wearer's head.
- FIG. 5 illustrates an alternative embodiment, whereby cellular liner 501 is recessed in the outside of rigid polymer foam liner 502.
- a barrier layer 503 is located at the interface between cellular liner 501 and rigid foam liner 502 to facilitate gliding of the cellular liner 501 parallel to rigid foam liner 502.
- Recess 504 provides a geometric constraint along at least a part of the periphery of the cellular liner 501.
- An out shell 505 may be used to cover cellular liner 501 for added impact protection or for aesthetic reasons.
- FIG. 6 depicts helmet impact test results, illustrating the efficacy by which various embodiments herein mitigate rotational head acceleration compared to standard polymer foam helmets, and compared to helmets that employ alternative strategies for mitigation of rotational head acceleration.
- a slip liner commercialized under the trademark "MIPS”, and disclosed by US patent 6,758,671 , reduces rotational head acceleration in response to an oblique impact by 27% compared to a standard bicycle helmet consisting of expanded polymer foam (EPS).
- EPS expanded polymer foam
- EPS expanded polymer foam
Landscapes
- Helmets And Other Head Coverings (AREA)
Claims (9)
- Ein Schutzhelm, bestehend aus:einer anisotropen zellularen Auskleidung (101) mit einer Drucksteifigkeit, die in Richtung einer Ebene niedriger ist als in einer außerhalb der Ebene liegenden Richtung;einer angrenzenden Auskleidung (102) aus Hartschaum;wobei die anisotrope Auskleidung (101) zumindest teilweise in der Hartschaumauskleidung (102) eingelassen und eingeschlossen ist, um eine allgemeine Verlagerung der anisotropen Auskleidung (101) relativ zu der Hartschaumauskleidung (102) zu verhindern; unddadurch gekennzeichnet, dass eine Sperrschicht (103) zwischen der anisotropen Auskleidung (101) und der angrenzenden Schaumauskleidung (102) vorgesehen ist, so dass die anisotrope zellulare Auskleidung (101) relativ zu der benachbarten Schaumauskleidung (101) gleitet und sich relativ zu dieser verlagern kann.
- Schutzhelm nach Anspruch 1, wobei die anisotrope zellulare Auskleidung (101) aus einer offenen Zellstruktur mit auxetischen Eigenschaften besteht, um eine sphärische Verformung der Auskleidung (101) ohne eine unregelmäßige Verformung der Zellgeometrie zu ermöglichen.
- Schutzhelm nach Anspruch 1, wobei die anisotrope zellulare Auskleidung (101) eine Drucksteifigkeit in Richtung der Ebene aufweist, die mindestens 50% niedriger ist als ihre Drucksteifigkeit in der außerhalb der Ebene liegenden Richtung, wenn sie in einer Richtung senkrecht zur Oberfläche der Auskleidung zusammengedrückt wird.
- Schutzhelm nach Anspruch 1, wobei die Sperrschicht (103) eine Beschichtung oder ein separates Folienelement aufweist, das das Eindringen der anisotropen zellularen Auskleidung (101) in die Oberfläche der Hartschaumauskleidung (102) verhindert.
- Schutzhelm nach Anspruch 1, wobei die Sperrschicht (103) einen Polymerfilm umfasst.
- Schutzhelm nach Anspruch 1, wobei die Hartschaumauskleidung (102) aus expandiertem Schaum hergestellt ist.
- Schutzhelm nach Anspruch 1, bei dem die anisotrope zellulare Auskleidung (101) in die Innen- oder Außenseite der Hartschaumauskleidung (102) eingelassen ist.
- Schutzhelm nach Anspruch 1, bei dem Scherkräfte als Reaktion auf einen schrägen Aufprall auf die Helmoberfläche zumindest teilweise durch Kompression eines Teils der anisotropen Auskleidung (101) in Richtung der Ebene absorbiert werden, die durch tangentiale Verlagerung eines Teils der anisotropen Auskleidung (101) innerhalb der Grenzen des eingelassenen Bereichs der Hartschaumauskleidung (102) verursacht wird.
- Schutzhelm nach Anspruch 1, wobei die angrenzende Auskleidung (102) aus Hartschaum eine nach innen gerichtete Oberfläche und eine nach außen gerichtete Oberfläche aufweist und die anisotrope zellulare Auskleidung (101) eine einheitliche Struktur ist, die mindestens 50% der nach innen gerichteten Oberfläche oder der nach außen gerichteten Oberfläche der angrenzenden Auskleidung (102) aus Hartschaum bedeckt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201662303884P | 2016-03-04 | 2016-03-04 | |
PCT/US2017/020830 WO2017152151A1 (en) | 2016-03-04 | 2017-03-03 | Protective liner for helmets and other articles |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3422887A1 EP3422887A1 (de) | 2019-01-09 |
EP3422887A4 EP3422887A4 (de) | 2020-01-15 |
EP3422887B1 true EP3422887B1 (de) | 2020-11-18 |
Family
ID=59743275
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17760965.8A Active EP3422887B1 (de) | 2016-03-04 | 2017-03-03 | Helm mit schutzauskleidung |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3422887B1 (de) |
CN (1) | CN109068783B (de) |
AU (1) | AU2017228415B2 (de) |
WO (1) | WO2017152151A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20230011532A1 (en) * | 2019-12-18 | 2023-01-12 | George Tfe Scp | Helmet |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3473122B1 (de) | 2017-10-19 | 2021-05-05 | Trek Bicycle Corporation | Fahrradhelm |
EP3530134A1 (de) * | 2018-02-23 | 2019-08-28 | Gerhard Karall | Schutzhelm mit einer helmkalotte |
US11337481B2 (en) * | 2018-05-11 | 2022-05-24 | Specialized Bicycle Components, Inc. | Helmet with foam layer having an array of holes |
EP3785558B1 (de) * | 2019-08-29 | 2023-03-08 | SQlab GmbH | Fahrradhelm mit dämpfungselement |
EP3838042B1 (de) | 2019-12-18 | 2022-06-08 | George TFE SCP | Helm |
DE102021110197B4 (de) * | 2020-04-30 | 2024-06-13 | Dräger Safety AG & Co. KGaA | Anordnungen umfassend einen Schutzhelm und zwei alternative Zwischenstücke zur Veränderung des Schwerpunkts |
EP4082372A1 (de) * | 2021-04-29 | 2022-11-02 | George TFE SCP | Befestigungsvorrichtung für zellulare energieabsorbierende struktur |
EP4082373B1 (de) * | 2021-04-29 | 2024-06-26 | George TFE SCP | Befestigungsvorrichtung für zellulare energieabsorbierende struktur |
CA3207421A1 (en) * | 2021-04-29 | 2022-11-03 | Piers Christian Storey | Cellular energy-absorbing structure fastening device |
US20230232935A1 (en) * | 2022-01-21 | 2023-07-27 | Joon Bu Park | Negative poisson`s ratio materials for winter sports equipment |
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2017
- 2017-03-03 CN CN201780027218.8A patent/CN109068783B/zh active Active
- 2017-03-03 EP EP17760965.8A patent/EP3422887B1/de active Active
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Cited By (1)
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US20230011532A1 (en) * | 2019-12-18 | 2023-01-12 | George Tfe Scp | Helmet |
Also Published As
Publication number | Publication date |
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EP3422887A1 (de) | 2019-01-09 |
EP3422887A4 (de) | 2020-01-15 |
AU2017228415B2 (en) | 2019-11-21 |
WO2017152151A1 (en) | 2017-09-08 |
AU2017228415A1 (en) | 2018-10-11 |
CN109068783A (zh) | 2018-12-21 |
CN109068783B (zh) | 2022-10-21 |
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