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WO2009095420A1 - Dispositif de protection - Google Patents

Dispositif de protection Download PDF

Info

Publication number
WO2009095420A1
WO2009095420A1 PCT/EP2009/050965 EP2009050965W WO2009095420A1 WO 2009095420 A1 WO2009095420 A1 WO 2009095420A1 EP 2009050965 W EP2009050965 W EP 2009050965W WO 2009095420 A1 WO2009095420 A1 WO 2009095420A1
Authority
WO
WIPO (PCT)
Prior art keywords
helmet
cogged
connection
centre
rotation
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.)
Ceased
Application number
PCT/EP2009/050965
Other languages
English (en)
Inventor
Andrea Lamera
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cierree Srl
Original Assignee
Cierree Srl
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Cierree Srl filed Critical Cierree Srl
Publication of WO2009095420A1 publication Critical patent/WO2009095420A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • A42B3/18—Face protection devices
    • A42B3/22—Visors
    • A42B3/221—Attaching visors to helmet shells, e.g. on motorcycle helmets
    • A42B3/222—Attaching visors to helmet shells, e.g. on motorcycle helmets in an articulated manner, e.g. hinge devices
    • A—HUMAN NECESSITIES
    • A42—HEADWEAR
    • A42B—HATS; HEAD COVERINGS
    • A42B3/00—Helmets; Helmet covers ; Other protective head coverings
    • A42B3/32—Collapsible helmets; Helmets made of separable parts ; Helmets with movable parts, e.g. adjustable
    • A42B3/326—Helmets with movable or separable chin or jaw guard

Definitions

  • the present invention relates to a protection device preferably, but not exclusively, for motorcyclists.
  • protection devices also called helmets
  • motorcyclists the main purpose of which is to protect the head of the motorcyclist from possible head injuries caused by falls. It is also known that helmets are grouped into different types according to their structure.
  • the structure consists of a first protective part, also called shell, configured so as to protect the user's head except for a front opening which remains free to define the user's field of view.
  • a movable protective part, called visor is hinged to opposite parts of the shell so that it is positioned frontally with respect to the front opening in a substantially lowered position and can swivel to at least one raised position.
  • a second type of helmet usually called “Jet"
  • the structure of the shell protects the user's head almost completely except the front part.
  • the front opening extends from the forehead to the neck of the motorcyclist.
  • the front opening is protected solely by a visor when the latter is in the lowered operating position.
  • a further type of helmet called “flip-up” consists of a shell and a chin bar connected to the shell via a connection mechanism which permits movement of the chin bar with respect to the shell.
  • the connection mechanism allows the chin bar to set to a first and a second configuration corresponding to helmet closed and helmet open.
  • the demand for flip-up helmets has increased significantly due to their versatility.
  • the chin bar makes it identical to a full face helmet.
  • connection mechanism between chin bar and shell comprises a pair of rotation fulcrums around which the chin bar rotates.
  • a flip-up helmet which comprises a chin bar hinged to the shell by means of pins provided in the lateral walls of the shell.
  • the pins allow the chin bar to rotate around their axis so that it can swivel from a raised position to a lowered position and vice versa, thus obtaining a full face or open helmet.
  • the connections with fixed fulcrum have several drawbacks. When the chin bar reaches the raised position, for example, it protrudes with respect to the upper surface of the shell.
  • a further drawback of the traditional flip-up helmets consists in the fact that as the chin bar moves from the lowered to the raised position, it does not reach, with respect to the shell, a position such as to sufficiently shift back the centre of gravity of the helmet. This subjects the user's neck to continuous stress in order to maintain the helmet and head in the erect position. In many cases, furthermore, the position of the chin bar once raised is too far forward, thus considerably limiting the field of view of the user and obliging the latter to tilt his/her head back to compensate for said lack of view.
  • a further drawback which accompanies a large number of known helmets is the fact that the parts constituting the connection mechanism (for example the rotation pins described in the above-mentioned patent application EP 1183957) are incorporated in the structure of the shell and/or in that of the chin bar. This obviously becomes a problem if, for example, one or more parts of the mechanism have to be replaced to renew the operation of said mechanism.
  • the main object of the present invention is to provide a helmet which overcomes the above-mentioned drawbacks and which constitutes a valid alternative to the traditional helmets used.
  • one object of the present invention is to provide a helmet in which the relative movement of the movable protective part with respect to the shell occurs in an easy and repeatable manner.
  • a further object of the present invention is to provide a helmet in which the relative movement of the movable protective part with respect to the shell is sufficient to ensure that said movable protective part reaches a position which is far enough back to avoid the above- mentioned “sail effect” and which shifts the centre of gravity of the helmet far enough back to avoid stress on the user's neck.
  • a further object of the present invention is to provide a helmet in which the movable protective part is connected to the shell by means of a mechanism consisting of a reduced number of components which can be easily assembled.
  • a further object of the present invention is to provide a helmet which is reliable and relatively easy to produce at competitive costs.
  • connection mechanism comprises first mechanical means which define a centre of rotation for the movable protective part with respect to the protective shell and second mechanical means operatively connected to the first mechanical means so as to vary the position of the centre of rotation between a first and a second reference position characteristic of said first and said second operating position respectively of said movable protective part.
  • movable protective part we mean any part of the helmet which provides, in at least said first operating position, a protective function. Therefore if the helmet is "full face” or “Jet”, the movable part can consist of a visor connected to the shell at opposite points with respect to the opening. If, on the other hand, the helmet is of the "flip-up" type (as illustrated in the accompanying figures), then the movable protective part could consist of the chin bar or alternatively the visor.
  • the structure of the helmet connection mechanism according to the invention permits effective movement of the movable part, advantageously ensuring that the latter reaches a position far enough back with respect to the protective shell when it moves from the first to the second operating position.
  • the above position of the movable part achieved via the connection mechanism advantageously gives the user a complete field of view also in an upward direction.
  • the latter should be considered a peculiarity of the present invention, especially if the helmet is configured according to the flip-up type in which the movable part can consist of the chin bar or alternatively the visor.
  • figure 1 is a first perspective view of an embodiment of a helmet according to the present invention
  • figure 2 is a detailed view of a connection mechanism of the helmet of figure 1
  • figure 3 is a second perspective view of the helmet of figure 1 relative to a first configuration of the helmet
  • figure 4 is a lateral view of the helmet of figure 3
  • figure 5 is a third perspective view of the helmet of figure 1 relative to a second configuration of the helmet
  • figure 6 is a lateral view of the helmet of figure 5
  • figure 7 is a third perspective view of the helmet of figure 1 relative to a third configuration of the helmet
  • figure 8 is a lateral view of the helmet of figure 7
  • figure 9 is a first exploded view relative to a further embodiment of the helmet according to the invention
  • figure 10 is a second exploded view relative to the helmet of figure 9.
  • the motorcycle helmet 1 comprises a protective shell 2 constructed to protect the head of a motorcyclist when it is worn.
  • the protective shell 2 is provided with at least one front opening 6 enabling the motorcyclist to see out once the helmet 1 has been put on.
  • the helmet 1 comprises a movable protective part 4 operatively connected at opposite points to the protective shell 2 via a connection mechanism 5.
  • the movable protective part 4 is connected to the shell 2 so that it faces the opening 6 frontally in a first operating position.
  • the connection mechanism 5 connects the two protective parts 2, 4 so as to permit a reversible movement of the movable protective part 4 from the first operating position to at least one second operating position.
  • the expression "reversible movement” is used to indicate that the movable part can move from the first to the second operating position and vice versa.
  • the helmet 1 is characterised in that it comprises first mechanical means 21 operatively connected to the helmet 1 so as to define a centre of rotation C of the movable protective part 4 with respect to the protective shell 2.
  • said rotation is performed not around a fixed centre of rotation but with respect to an "instantaneous" centre of rotation, i.e. a centre of rotation with variable position.
  • the centre of rotation C of the movable part 4 assumes a continuously different position during the relative movement.
  • connection mechanism 5 comprises second mechanical means 22 operatively connected to the first mechanical means 21 so as to vary in a predefined manner the position of the centre of rotation C between a first and a second reference position characteristic of the first and second operating position respectively of the movable part 4 with respect to the shell 2.
  • the second mechanical means 22 constrain a relative movement between the two protective parts (movable protective part 4 and shell 2) so that when the centre of rotation C assumes the first reference position, the movable part 4 assumes the first operating position, whereas when the instantaneous centre of rotation C assumes the second reference position, the movable part 4 occupies the second operating position with respect to the shell 2. Consequently when the centre of rotation C assumes an intermediate position between the two reference positions, then the movable part 4 will also assume an intermediate position between the first and the second operating position.
  • FIGS. 1 and figure 2 are a perspective view and a lateral view respectively of a possible embodiment of the helmet according to the present invention.
  • the helmet illustrated is of the "flip-up" type and hence provided with a movable protective part 4 (hereinafter indicated also as chin bar 4), which in a first operating position, i.e. when lowered, has the function of protecting the mandibular region of the user's skull.
  • the helmet 1 illustrated also comprises a second movable part 3, called visor, which is made of transparent material and has the function of protecting the user's eyes once it is in the corresponding operating position.
  • the helmet is illustrated in a substantially “closed” configuration so that the chin bar 4 and the visor 3 assume the corresponding first operating position indicated below also by the expression “lowered position”.
  • the helmet 1 is provided with a connection mechanism 5 which allows reversible movement of the chin bar 4 from the lowered position to a second operating position, hereinafter also indicated by the expression “raised position”.
  • the connection mechanism 5 will be described considering the chin bar 4 as a movable part, the same principles being also applicable to the movement of a visor whether the helmet is of the flip-up, Jet or full face type.
  • connection mechanism 5 is provided with first mechanical means 21 comprising a first cogged element 31 integral with the protective shell 2 and a second cogged element 32 integral with the portion of movable protection, i.e. the chin bar 4.
  • Said second cogged element 32 engages the first cogged element 31 so as to permit a rotation of the chin bar 4 with respect to the shell around a centre of rotation C.
  • the second mechanical means 22 comprise a guide element operatively connected to one of said cogged elements 31, 32 so as to constrain the movement thereof in a pre-established direction 100 thus varying in a corresponding manner the position of the centre of rotation C.
  • the centre of rotation C of the chin bar 4 with respect to the shell 2 is a centre of instantaneous rotation for the chin bar.
  • the guide element permits movement of said centre of rotation along a pre-established path between a first and a second reference position characteristic of a lowered position and a raised position respectively of the chin bar 4.
  • the first cogged element 31 is formed by a rack element integral with the shell 2
  • the second cogged element 32 is formed by a sector of cogged wheel integral with the chin bar 4.
  • said wheel sector develops around a reference centre T and comprises an end with pin 33 (see figures 9 and 10).
  • the guide element is formed by a cavity 41, defined on a part integral with the shell 2, in which the end with pin 33 of the second cogged element 32 is inserted in a sliding manner.
  • said cavity develops longitudinally in a pre-established direction 100 substantially parallel to the direction in which the rack element develops. In this way the centre of instantaneous rotation is constrained to move in a direction parallel to the cavity or the direction of the rack.
  • figure 2 illustrates the helmet 1 in a closed configuration in which the chin bar 4 assumes a first operating position as defined above, i.e. lowered.
  • first 31 and second cogged element 32 defines a centre of rotation C of the chin bar 4 with respect to the shell 2 which assumes a first reference position Pl which can be identified, solely for descriptive purposes, also by the position of the reference centre T of the sector of cogged wheel which forms the second cogged element 32. It is clear that the distance between the position of the reference centre T and that of the centre of instantaneous rotation is constant during the relative movement.
  • Figures 3 and 4 are a perspective view and a lateral view respectively of the helmet of figures 1 and 2 during a first phase of opening of the helmet.
  • Said opening can be performed, for example, via a direct action on the chin bar 4 in the direction, for example, indicated by the arrow F in figure 2.
  • the opening could be the direct consequence of the activation of a spring mechanism provided between the chin bar 4 and the shell 2 so as to generate an opening torque.
  • Figures 5 and 6 are a perspective view and a lateral view respectively of the helmet 1 of figures 1 and 2 during a second phase of opening of the helmet.
  • the end with pin 33 assumes a new position P which is farther back than the position of the same end in the configuration of figure 4 (again with respect to the first position Pl).
  • a greater opening angle ⁇ of the helmet or a greater rotation angle
  • Said movement farther back of the chin bar 4 is clearly a function of the inclination of the cavity 41, i.e. of the rack on which the sector of cogged wheel engages. Consequently the position reached by the chin bar following the movement can be advantageously defined a priori by varying the inclination of the rack with respect to a horizontal reference plane PO like the one indicated in figure 6.
  • Figures 7 and 8 illustrate the helmet of figures 1 and 2 in an open configuration in which the chin bar 4 has reached the second operating position defined above also as raised position.
  • the end with pin 33 of the sector of cogged wheel occupies, within the cavity 41, a position substantially opposite to the one illustrated in figure 2.
  • Said position P2 is characteristic of the second reference position assumed by the centre of instantaneous rotation of the chin bar 4.
  • the position P2 constitutes a stroke end point for the relative opening movement between the chin bar 4 and the shell 2.
  • said second reference position P2 represents the starting point for the relative closing movement between the chin bar 4 and the shell 2.
  • the distance between the first and the second reference position constitutes a distance characteristic of the backward movement of the chin bar 4 during opening of the helmet.
  • the sector of cogged wheel will rotate on the rack in a direction opposite to the opening direction and at the same time the end with pin 33 will move forward
  • Figures 9 and 10 illustrate a preferred embodiment of the invention according to which the first cogged element 31 is integral with the shell 2 via a first connection insert 16, while the second cogged element 32 is integral with the chin bar via a second connection insert 17.
  • connection mechanism 5 which show a possible embodiment of said connection inserts 16 and 17.
  • the first connection insert 16 is formed by a first plate 26 which is operatively located in a recess 38 defined on the surface of the shell 2.
  • Said first plate 26 comprises a surface 80 on one first side of which a perimeter edge 81 develops.
  • the first cogged element 31 i.e. the rack element illustrated in the case in point
  • said first element 31 is made in one single piece with the first plate 26, for example by means of known industrial pressing processes.
  • the first plate 26 is inserted in the recess 38 so that said first side of the surface 80 faces the bottom surface 39 of the recess.
  • a cavity forms between the two parts; said cavity houses the second cogged element 32 (constituted, in the case in point illustrated, by the sector of cogged wheel) so as to engage the first cogged element 31.
  • the recess 38 is delimited in depth by a bottom surface 39 which defines the rectilinear guide cavity 41 for the end with pin 33 of the second cogged element 32.
  • First connection means are used to ensure stable positioning of the first plate 26 inside the recess 38.
  • the first plate 26 comprises an operating seat 19 for a connection element, for example a screw or a pin.
  • a connection element for example a screw or a pin.
  • the perimeter edge 81 is provided with a coupling tab 85 which fits into a corresponding slot 35 obtained along one edge of the bottom surface 39 of the recess 38.
  • connection end 43 of the second cogged element 32 comprises an opening 87 to allow the passage of a connection end 43 of the second cogged element 32.
  • connection end 43 connects integrally with a connection portion 44 integral with the second insert 17.
  • the latter is in turn connected to an inner side 4B of the chin bar 4 as clearly shown in figure 9.
  • the second insert 17 is formed by a second plate 27 from one first side of which the connection portion 44 emerges.
  • Said portion is constructed so as to define a seat 46 for the connection end 43 of the second cogged element 32.
  • the connection portion 44 comprises a pin 49 with an outer surface provided with a plurality of flat surfaces. Said pin is inserted in a cavity 56 (see figure 9) defined internally at the connection end 43 of the second cogged element 32.
  • the inner surface of said cavity 56 has flat surfaces 57 geometrically corresponding to those defined on the outer surface of the pin 49. This allows mating between said pin 49 and said cavity 56.
  • said coupling has the function of making the second cogged element 32 integral with the second insert 17, substantially avoiding the anti-rotation of one of these elements with respect to the other. In other words, the mating ensures that the second cogged element 32 and the second insert 17 (i.e. the chin bar 4 connected to it) rotate as if they were one single piece.
  • connection means which stably fix the connection end 43 to the connection portion 44.
  • Said second means can comprise for example a connection screw 73 which tightens inside the cavity 56, in practice providing a joint between the latter and the pin 49 emerging from the second plate 27 which defines the second insert 17.
  • connection means which permit a stable connection to an inner side 4B of the chin bar 4.
  • said connection is provided by a pair of pins which emerge from the inner side 4B of the chin bar and fit into seats provided on the second plate 27 of the second insert 17.
  • Obviously other functionally equivalent means could be used for the same purposes.
  • connection mechanism 5 The structure of the connection mechanism 5 described is particularly advantageous also in terms of assembly which is performed substantially as follows.
  • the second cogged element 32 is operatively coupled to the first cogged element 31 so that its connection end 43 comes out of the opening 87 obtained on the first plate 26.
  • the connection end 43 is then fixed to the second insert 17, exploiting the mating and the second connection means.
  • Said second insert 17 is then connected to the inner side 4B of the chin bar 4 via the third connection means indicated above.
  • the chin bar 4 is definitively connected to the shell 2 by insertion of the first plate 27 in the recess 38. Said connection is ensured by the action of the first connection means as specified above.
  • connection mechanism 5 described and in particular use of the connection inserts 16 and 17 should be considered a possible embodiment of the invention.
  • the second cogged element 32 could for example be made in one single piece with the chin bar 4, while the first cogged element 31 could also be made in one single piece with the shell 2.
  • connection mechanism allows the movable protective part to be positioned farther back during the opening movement of the same. This allows the desired objectives to be achieved including a reduction in the sail effect and moving of the centre of gravity of the helmet farther back.
  • the helmet is provided with a connection mechanism consisting of a relatively reduced number of components which can be easily assembled and produced by known industrial processes.

Landscapes

  • Helmets And Other Head Coverings (AREA)

Abstract

La présente invention concerne un dispositif de protection de préférence, mais non pas exclusivement, pour des motards. Le casque selon l'invention comporte une coque de protection (2) qui comporte au moins une ouverture avant (6) sur laquelle une partie de protection mobile (4) est orientée, connectée en des points opposés à la coque par le biais d'un mécanisme de connexion (5). Ce dernier comporte un premier moyen mécanique (21) qui définit un centre de rotation (c) de la partie de protection mobile par rapport à la coque de protection. Le mécanisme comporte par ailleurs un deuxième moyen mécanique (22) connecté de manière fonctionnelle audit premier moyen mécanique (21) afin de varier la position dudit centre de rotation.
PCT/EP2009/050965 2008-01-29 2009-01-28 Dispositif de protection Ceased WO2009095420A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBG2008A000007 2008-01-29
ITBG20080007 ITBG20080007A1 (it) 2008-01-29 2008-01-29 Dispositivo di protezione

Publications (1)

Publication Number Publication Date
WO2009095420A1 true WO2009095420A1 (fr) 2009-08-06

Family

ID=40289883

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/050965 Ceased WO2009095420A1 (fr) 2008-01-29 2009-01-28 Dispositif de protection

Country Status (2)

Country Link
IT (1) ITBG20080007A1 (fr)
WO (1) WO2009095420A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2518723A (en) * 2013-07-25 2015-04-01 Shiro Helmets S A Protective helmet for cyclists and skiers
WO2015110764A1 (fr) * 2014-01-24 2015-07-30 Astone Helmets Partners Casque de protection avec mentonniere mobile
CN105901820A (zh) * 2016-06-08 2016-08-31 江门市鹏程头盔有限公司 一种基于齿轮约束的可变护颚结构型头盔
WO2020177342A1 (fr) 2019-03-04 2020-09-10 江门市鹏程头盔有限公司 Casque de type à contrainte d'engrenage muni d'une structure de protection de mâchoire transformable
US20240285019A1 (en) * 2021-06-29 2024-08-29 Schuberth Gmbh Protective helmet

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0797935A1 (fr) * 1996-03-18 1997-10-01 E.D.C. Sa Casque du type intégral pour motocyclistes ou similaires équipé d'un dispositif pour ouvrir/fermer la mentonnière
EP1106090A2 (fr) * 1999-12-06 2001-06-13 Hong Jin Crown Corporation Ltd. Casque muni d'un dispositif de protection des mâchoires
EP1183957A2 (fr) * 2000-08-31 2002-03-06 Project Srl Dispositif d'assujettissement pour la mentonnière mobile d'un casque
EP1797784A1 (fr) * 2005-12-15 2007-06-20 HJC Co., Ltd. Dispositif pour soulever et abaisser la mentonnière d'un casque de protection

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0797935A1 (fr) * 1996-03-18 1997-10-01 E.D.C. Sa Casque du type intégral pour motocyclistes ou similaires équipé d'un dispositif pour ouvrir/fermer la mentonnière
EP1106090A2 (fr) * 1999-12-06 2001-06-13 Hong Jin Crown Corporation Ltd. Casque muni d'un dispositif de protection des mâchoires
EP1183957A2 (fr) * 2000-08-31 2002-03-06 Project Srl Dispositif d'assujettissement pour la mentonnière mobile d'un casque
EP1797784A1 (fr) * 2005-12-15 2007-06-20 HJC Co., Ltd. Dispositif pour soulever et abaisser la mentonnière d'un casque de protection

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2518723A (en) * 2013-07-25 2015-04-01 Shiro Helmets S A Protective helmet for cyclists and skiers
WO2015110764A1 (fr) * 2014-01-24 2015-07-30 Astone Helmets Partners Casque de protection avec mentonniere mobile
FR3016774A1 (fr) * 2014-01-24 2015-07-31 Astone Helmets Partners Casque de protection avec mentonniere mobile
CN105901820A (zh) * 2016-06-08 2016-08-31 江门市鹏程头盔有限公司 一种基于齿轮约束的可变护颚结构型头盔
AU2016225881A1 (en) * 2016-06-08 2018-01-04 Jiangmen Pengcheng Helmets Ltd. Helmet with transformable jaw protecting structure based on gear constraint
EP3278684A4 (fr) * 2016-06-08 2018-03-07 Jiangmen Pengcheng Helmets Ltd. Casque ayant une structure de mentonnière à réglage commandé par engrenage
AU2016225881B2 (en) * 2016-06-08 2018-06-21 Jiangmen Pengcheng Helmets Ltd. Helmet with transformable jaw protecting structure based on gear constraint
US10143259B2 (en) * 2016-06-08 2018-12-04 Jiangmen Pengcheng Helmets Ltd. Helmet with transformable jaw protecting structure based on gear constraint
CN105901820B (zh) * 2016-06-08 2019-01-29 江门市鹏程头盔有限公司 一种基于齿轮约束的可变护颚结构型头盔
WO2020177342A1 (fr) 2019-03-04 2020-09-10 江门市鹏程头盔有限公司 Casque de type à contrainte d'engrenage muni d'une structure de protection de mâchoire transformable
DE112019005996T5 (de) 2019-03-04 2021-08-12 Jiangmen Pengcheng Helmets Ltd. Helm mit einer zahnradgebundenen variablen Kinnschutzstruktur
GB2592791A (en) * 2019-03-04 2021-09-08 Jiangmen Pengcheng Helmets Ltd Gear-constraint-type helmet with transformable jaw-guard structure
ES2878249R1 (es) * 2019-03-04 2022-10-20 Jiangmen Pengcheng Helmets Ltd Casco con estructura de mentonera transformable con restriccion de engranaje
GB2592791B (en) * 2019-03-04 2022-11-02 Jiangmen Pengcheng Helmets Ltd Helmet with gear-constraint transformable chin guard structure
US11696613B2 (en) 2019-03-04 2023-07-11 Jiangmen Pengcheng Helmets Ltd. Helmet with gear-constraint transformable chin guard structure
US20240285019A1 (en) * 2021-06-29 2024-08-29 Schuberth Gmbh Protective helmet

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