EP3181001B1 - Lock for helmet chinguard - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION

The invention relates to the field of helmets with a retractable chin guard. It finds for particularly advantageous but non-limiting application the field of helmets for two or three-wheeled vehicle or for any vehicle in which the wearing of the helmet is mandatory, for example in sports driving.

A preferred application is that of the retractable chin guard helmets. It is possible in some cases to transform a helmet including a user of two wheels in two different configurations, namely a configuration "Integral" and a configuration in "Jet".

In "Full" configuration, the helmet protects the entire face of the user with a chin strap forming the lower front part of the helmet. This chinrest can be retracted by lifting, frequently being able to be placed at the back or up of the helmet, which forms the configuration in "Jet". Only a protective screen is left in front of the helmet in this "Jet" configuration, this protection screen being the most frequently a visor.

The invention also applies to retractable chinrests for the purpose of raising it, and also generally the visor above the user's field of vision, in particular to facilitate access to the face or the setting place and the removal of the helmet.

STATE OF THE ART

There are several types of retractable chin guard.

A helmet currently available and equipped with a chinrest retractable provides a retraction of the chin strap for the transformation of the helmet configuration Integral Jet. Keeping the helmet on the head, the user presses a button in the middle of the chin. The chin strap can then be advanced from the helmet and then raised to a high position to be retracted completely at the back of the helmet.

This mechanism is however complicated with a complex movement of the chinrest forward of the helmet followed by a rotation. In addition, the user must press the button while he raises the chin,

The document DE-A-10234330 describes a helmet with a hull wearing a pivoting chin. The pivoting chin guard is locked to the helmet shell by a spring lock. The locking device has a latch on each lateral side of the chinrest. On each lateral side of the shell, there is provided a locking rod, a free end provided with a head enters a housing in the form of an oblong hole carried by a plate forming part of the lock.

A locking mechanism is also provided for locking the head of the rod in the oblong hole, this locking mechanism being recalled under the action of a spring. The locking is done by pushing the chinrest towards the shell during a lowering of the chinrest by pivoting around pins of the chinrest carried by the shell, the heads of the rods penetrating the lock housing on each side of the chinrest .

As is recognized in this document, the locking mechanism may not be in place on the head of the rod. That is why this document provides to use a lock indicator visible by the user as the locking mechanism is not operational in the locking position.

In addition, in the locking mechanism proposed in this document, the lowering of the chin strap directly causes locking.

An object of the present invention is therefore to provide at least one latch for a helmet chin guard, unlocking the latch and retraction chinrest can be done, according to the choice of the user, simultaneously or sequentially in two steps requiring no not to be performed simultaneously. An alternative is also presented in the document EP1 183 957 .

SUMMARY OF THE INVENTION

To achieve this objective, one aspect of the present invention relates to a latch for a retractable helmet chin guard, the latch comprising a user operable control button from an initial position of the button corresponding to a lock and locking means of the lock in the initial position, the lock being configured so that a user action on the control button places the locking means in a release position allowing a movement of retraction of the chin strap. A particular advantage of this lock is that the locking means are configured so that the release position remains stable after releasing the action of the user on the button and when returning to the initial position of said button.

The locking means comprise a rocker, said rocker being movable to move from a configuration in contact with a latch in the initial position, to a configuration without contact with the latch in the release position. Another aspect of the present invention relates to a helmet wherein said at least one latch is secured to the chin strap while a locking finger attached to the helmet shell is locked by said at least one latch.

• actionnement d'un bouton (2) de commande dudit au moins un verrou par un utilisateur à partir d'une position initiale correspondant à un verrouillage de la mentonnière (18) en position non escamotée sur la coque (19) et à un blocage du verrou dans la position initiale de verrouillage,
• mise en position de libération de blocage dudit au moins un verrou, la mentonnière (18) restant en position non escamotée sur la coque (19),
• relâchement du bouton (2) de commande par l'utilisateur et retour en position initiale du bouton (2) de commande avec maintien stable de la position de libération de blocage dudit au moins un verrou lors du retour en position initiale du bouton (2),
• action de l'utilisateur sur la mentonnière (18) pour son escamotage ou action séquentielle de l'utilisateur sur un second verrou pour son déverrouillage.

Another aspect of the present invention relates to a method of unlocking at least one latch of a chinrest (18) retractable hinged to a shell (19) of helmet according to any one of the two aspects above. Advantageously, said method comprises the following steps:

• actuating a button (2) for controlling said at least one lock by a user from an initial position corresponding to a locking of the chinrest (18) in the non-retracted position on the shell (19) and a locking of the lock in the initial locking position,
• placing in the locking release position of said at least one lock, the chin rest (18) remaining in the non-retracted position on the shell (19),
• releasing the user control knob (2) and returning the control knob (2) to the initial position with stable holding of the locking release position of said at least one latch when the button is returned to its initial position (2) ,
• action of the user on the chinrest (18) for its retraction or sequential action of the user on a second latch for unlocking.

A technical effect thus obtained is to obtain a stable intermediate unlocking position which is a lock release position of the lock, the lock release position of the lock remaining stable when the button is returned to its initial position. This position is a position waiting for a final unlocking of the chinrest by retraction thereof, for example by raising up and back of the helmet. Maintaining this blocking release position requires no action from the user's hand.

This frees the user's hand while maintaining this blocking release position stable. After pressing the control button to place the lock in its unlocking release position and releasing the button without the lock having left its locked position, the user has both hands free.

When there is only one lock on the helmet, the user has more ease to operate the chinrest to place it in a retracted position with no other action of the user on the chin rest.

Similarly, when there are two locks on the helmet, in the lock release position of one of the two locks, the user has the hands free to place the second lock in this lock release position, and then to simultaneously place the chinrest in its retracted position or is to place the chinrest in its retracted position later to the locking release of the second latch.

Thus, the user no longer needs to actuate the two locks simultaneously while at the same time exerting a retraction action of the chin guard. It is thus possible for him to retract the chinrest with one hand and even a single finger, a finger of the hand of the user pressing first on a control button of a first lock , releasing it without the lock being locked again, then a finger of the hand then pressing the control button of a second lock and then releasing it and finally one of the two hands then free of the user exercising on the chinrest a retraction action, the two locks always being in the blocking release position without the user exerting any action on them.

In all cases, it is obtained an ease of retraction of the chin, the user no longer having to worry about any maintenance in blocking release position of one or two locks. Previously, this required a continuous action of the user on the lock or both locks to allow the retraction of the chin guard.

BRIEF DESCRIPTION OF THE FIGURES

• la figure 1 est une représentation schématique d'une vue en perspective éclatée d'un mode de réalisation du verrou selon la présente invention,
• la figure 2 est une représentation schématique d'une vue latérale d'un mode de réalisation du verrou selon la présente invention pour une mentonnière d'un casque pouvant être placée dans une position escamotée sur le casque, le carénage du verrou ayant été ôté et le verrou se trouvant dans sa position de verrouillage à cette figure,
• la figure 3 est une représentation schématique du verrou selon le mode de réalisation de la figure 1, le verrou se trouvant en début de position de déverrouillage séquentiel selon une première étape de déverrouillage avec soulèvement d'une lame ressort par le basculeur pour son passage,
• la figure 4 est une représentation schématique du verrou selon le mode de réalisation de la figure 1, cette figure montrant le blocage du basculeur du verrou par la lame ressort après son passage de l'autre côté de la lame ressort,
• la figure 5 est une représentation schématique du verrou selon le mode de réalisation de la figure 1, le verrou se trouvant en position de déverrouillage séquentiel selon une deuxième étape de déverrouillage avec déblocage du basculeur et du loquet,
• la figure 6 est une représentation schématique du verrou selon le mode de réalisation de la figure 1, le verrou se trouvant en fin de position de déverrouillage séquentiel avec déblocage du doigt de verrouillage quand la mentonnière est suffisamment escamotée,
• la figure 7 est une représentation schématique du verrou selon le mode de réalisation de la figure 1, le verrou se trouvant en début de position de verrouillage quand la mentonnière est remise en position non escamotée.

The objects as well as the features and advantages of the invention will become more apparent from the detailed description of an embodiment thereof which is illustrated by the following accompanying drawings in which:

• the figure 1 is a schematic representation of an exploded perspective view of an embodiment of the latch according to the present invention,
• the figure 2 is a schematic representation of a side view of an embodiment of the lock according to the present invention for a chin strap of a helmet that can be placed in a retracted position on the helmet, the fairing of the lock having been removed and the lock is finding in its locking position to this figure,
• the figure 3 is a schematic representation of the lock according to the embodiment of the figure 1 , the latch being at the beginning of the sequential unlocking position in a first unlocking step with lifting of a leaf spring by the rocker for its passage,
• the figure 4 is a schematic representation of the lock according to the embodiment of the figure 1 this figure showing the blocking of the bolt rocker by the leaf spring after its passage on the other side of the leaf spring,
• the figure 5 is a schematic representation of the lock according to the embodiment of the figure 1 , the lock being in the sequential unlocking position according to a second unlocking step with release of the rocker and the latch,
• the figure 6 is a schematic representation of the lock according to the embodiment of the figure 1 , the lock being at the end of the sequential unlocking position with unlocking of the locking finger when the chin guard is sufficiently retracted,
• the figure 7 is a schematic representation of the lock according to the embodiment of the figure 1 , the latch being at the beginning of the locking position when the chinrest is returned to the non-retracted position.

The drawings are given by way of examples and are not limiting of the invention. They constitute schematic representations of principle intended to facilitate the understanding of the invention and are not necessarily at the scale of practical applications. In particular, the dimensions of the different pieces are not representative of reality.

DETAILED DESCRIPTION OF THE INVENTION

• un ressort est configuré pour permettre au bouton de commande de revenir dans sa position initiale après relâchement de l'action de l'utilisateur.
• le verrou porte un axe de rotation pour le bouton de commande, l'action de l'utilisateur sur le bouton de commande effectuant un pivotement du bouton autour de son axe, un loquet étant mobile entre la position initiale et une position de libération , le basculeur bloquant le loquet dans la position initiale, le basculeur étant monté pivotant autour du même axe de rotation que le bouton de commande et présentant au moins une zone de contact coopérant avec une zone de contact du bouton de commande pour la transmission du pivotement du bouton de commande au basculeur jusqu'à la position de libération, le basculeur étant maintenu dans la position de libération par des moyens de maintien formant butée contre un pivotement du basculeur vers sa position de blocage du loquet, le basculeur étant rappelé dans sa position de blocage par un ressort.
• une platine de glissement portant le bouton de commande, le basculeur (3), l'axe commun du bouton de commande et du basculeur, le loquet et un axe de rotation du loquet, la platine présentant des moyens de maintien, lesdits des moyens de maintien peuvent être une lame ressort dont une extrémité libre maintient le basculeur dans sa position de libération de blocage en formant lesdits moyens de maintien en position, le bouton de commande étant rappelé dans sa position initiale sous l'action d'un ressort dès que l'action de l'utilisateur sur le bouton de commande cesse.
• le loquet est monté pivotant autour de son axe à travers la platine, le loquet présentant à sa périphérie, d'une part, un profil contactant une portion supérieure du basculeur opposée à un bord de contact du basculeur coopérant avec un bord de contact du bouton de commande, les bords de contact faisant partie respectivement des zones de contact respectivement du basculeur et du bouton et, d'autre part, une excroissance contactant la lame ressort après déblocage du loquet lors de son pivotement autour de son axe vers une position de déverrouillage.
• le pivotement du loquet à partir de sa position de libération de blocage vers une position de déverrouillage s'effectue lors d'une action d'escamotage de la mentonnière réalisée par l'utilisateur. Il y'a en effet un ressort épingle de rappel du loquet, en revanche, ce ressort n'a pas pour but d'amener le loquet de sa position de verrouillage vers sa position de déverrouillage. C'est bien l'action d'escamotage de la mentonnière qui vient faire pivoter le loquet de sa position de verrouillage vers sa position de déverrouillage. Sans l'action de rotation de la mentonnière, le loquet resterait dans sa position de verrouillage (sous l'effort de la lame ressort et du basculeur venant jouer le rôle de butée). Le ressort de rappel du loquet est une sécurité pour éviter que lorsque celui-ci est en position de déverrouillage, il revienne pour quelques raisons dans sa position de verrouillage alors que la mentonnière est en position Jet.
• en position du verrouillage, le loquet et le basculeur sont du même côté de la lame ressort alors qu'en maintien en position de libération de blocage du basculeur, l'extrémité libre de la lame ressort, présentant une forme de pointe, est intercalée entre le basculeur et le loquet.
• en début de pivotement du loquet après son déblocage, l'excroissance (4a) du loquet contacte une portion saillante en vis-à-vis se trouvant vers l'extrémité libre de la lame ressort et présente une hauteur suffisante pour le soulèvement de ladite portion de la lame ressort permettant le passage de la portion supérieure du basculeur de l'autre côté de l'extrémité libre en forme de pointe de la lame ressort, l'extrémité libre formant butée pour la portion supérieure du basculeur contre un retour vers sa position de blocage du loquet.
• un carénage, le carénage et la platine de glissement se trouvant chacun sur un de deux côtés opposés du verrou, le carénage comprenant un trou oblong destiné au guidage d'un doigt de verrouillage pénétrant dans et destiné à être verrouillé par le verrou.

Before starting a detailed review of embodiments of the invention, are set forth below optional features that may optionally be used in combination or alternatively:

• a spring is configured to allow the control knob to return to its initial position after releasing the action of the user.
• the lock carries an axis of rotation for the control button, the action of the user on the control button pivoting the button about its axis, a latch being movable between the initial position and a release position, the rocker blocking the latch in the initial position, the rocker being pivotally mounted about the same axis of rotation as the control knob and having at least one contact zone cooperating with a contact zone of the control button for transmitting the pivoting of the knob control device to the release position, the rocker being maintained in the release position by holding means forming a stop against a pivoting of the rocker to its locking position of the latch, the rocker being returned to its locking position by a spring.
• a sliding plate carrying the control button, the rocker (3), the common axis of the control knob and the rocker, the latch and a rotational axis of the latch, the plate having holding means, said retaining means may be a leaf spring whose one free end maintains the rocker in its blocking release position by forming said holding means in position, the control knob being returned to its initial position under the action of a spring as soon as possible. that the user's action on the command button stops.
• the latch is pivotally mounted about its axis through the plate, the latch having at its periphery, on the one hand, a profile contacting an upper portion of the rocker opposite to a contact edge of the rocker cooperating with a contact edge of the button of control, the contact edges being respectively part of the contact areas respectively of the rocker and the button and, secondly, an outgrowth contacting the spring blade after unlocking the latch when pivoting about its axis to an unlocked position .
• the pivoting of the latch from its locking release position to an unlocking position is effected during a retraction action of the chinrest made by the user. There is indeed a latch pin return pin, however, this spring is not intended to bring the latch from its locking position to its unlocked position. It is the action of retraction of the chinrest that rotates the latch from its locking position to its unlocked position. Without the action of rotation of the chin guard, the latch would remain in its locking position (under the force of the spring blade and rocker coming to play the role of stop). The latch return spring is a security to prevent that when it is in the unlocked position, it returns for a few reasons in its locking position while the chinrest is in the Jet position.
• in the locking position, the latch and the rocker are on the same side of the leaf spring while maintaining the blocking release position of the rocker, the free end of the leaf spring, having a tip shape, is interposed between the rocker and the latch.
• at the beginning of pivoting of the latch after its release, the protuberance (4a) of the latch contacts a protruding portion facing the free end of the spring blade and has a height sufficient for the lifting of said portion of the spring blade allowing the passage of the upper portion of the rocker on the other side of the tip-shaped free end of the leaf spring, the free end forming a stop for the upper portion of the rocker against a return to its locking position of the latch.
• a fairing, the fairing and the sliding plate being each on one of two opposite sides of the lock, the fairing comprising an oblong hole for guiding a locking pin penetrating into and to be locked by the lock.

For the helmet according to the invention, when said at least one latch comprises an open housing for receiving a locking finger and, when said at least one latch comprises a latch, the open housing is carried by the latch.

Advantageously, the chin guard has a locking device comprising at least two locks, each lock being active on a respective articulation of the chinrest on the shell.

Advantageously, the shell has two lateral faces, a latch being positioned on a respective lateral face.

For the locking method according to the present invention, when the action of the user is done sequentially on a second latch, it is advantageously carried out the repetition of the steps of actuating a control button, setting the position of release of locking and release of the control button of the second lock by the user with a return to the initial position of the control button and stable maintenance of the locking release position of the second lock when returning to the initial position of the button, these steps being followed by the action of the user on the chin strap for his retraction.

Advantageously, when the latches of the chinrest are two in number, it is proceeded simultaneously for the two locks to the steps of actuating the control buttons, setting in the release position for locking, release and return of the control buttons in their initial position with stable maintenance of the unlocked positions of the two locks when returning to the initial position of the buttons, these steps being conducted simultaneously on the two locks and followed by the action of the user on the chin for its retraction. It is also possible to unlock the chin strap in an additional alternative way. Indeed, the user can operate both buttons simultaneously, keep the pressure on them and retract the chin strap in the same gesture. This is not what is recommended for the present invention, but this alternative is also possible and considered.

• libération du blocage du loquet par pivotement d'un basculeur,
• maintien stable en position de libération de blocage du basculeur,
• pivotement du loquet vers sa position de déverrouillage réalisé par une action de l'utilisateur sur la mentonnière et permettant son escamotage dans la position de déverrouillage du loquet par désolidarisation du doigt de verrouillage du loquet. Avantageusement, c'est bien l'action d'escamotage qui met en rotation le loquet afin de libérer le doigt de verrouillage. Sans action d'escamotage de la mentonnière, le loquet ne tourne pas vers sa position de déverrouillage.

Advantageously, the locking release of said at least one lock is by pivoting a latch biased to an unlocking position from a locking position with latch locking, the latch receiving a locking finger temporarily securing it with the shell in the locking position, the unlocking being done according to the following steps:

• release of the locking latch by pivoting a rocker,
• stable hold in the rocker lock release position,
• pivoting of the latch to its unlocking position achieved by an action of the user on the chinrest and allowing its retraction in the unlocked position of the latch by detaching the locking finger of the latch. Advantageously, it is the retraction action that rotates the latch to release the locking finger. Without retraction action of the chinrest, the latch does not turn to its unlocking position.

• action de l'utilisateur sur la mentonnière entraînant un appui du loquet avec l'élément, l'appui du loquet sur l'élément sous l'action de l'utilisateur provoquant le pivotement du loquet vers sa position de verrouillage,
• libération du maintien stable du basculeur lors du pivotement du loquet,
• fin du pivotement du loquet vers sa position de verrouillage et blocage du loquet dans ladite position de verrouillage par pivotement du basculeur rappelé vers sa position de blocage.

When the integral position of the chin guard on the helmet which is its position of protection of the face of the user, the locking of said at least one lock is done according to the following steps:

• action of the user on the chinrest causing a latch support with the element, the support of the latch on the element under the action of the user causing the pivoting of the latch to its locking position,
• release of the stable support of the rocker during the pivoting of the latch,
• end of the pivoting of the latch to its locking position and locking the latch in said locking position by pivoting the biased rocker to its locking position.

For a good understanding of the description, spring means a device capable of having a reversible deformation phase allowing a go and a return through elastic deformation. It does not matter the matter and the shape of the spring.

Referring to all the figures, the present invention relates to a liftable chinrest latch modular helmet, the chin is then placed in a retracted position, advantageously raised. The retracted position corresponds to a position in which the chinrest is raised more than in a position where its protection is active. This position can bring the chinrest at least at the user's forehead.

The lock according to the present invention aims to automatically lock the modular helmet chin guard in its safety position when the chinrest is not raised, the lock then being in the locked position. The lock also allows the unlocking of the same chin guard, this after release of the lock from its locking position.

The present invention also relates to a locking device provided with two locks. In one embodiment, each latch may be disposed on a lateral side of the chinrest. Advantageously, it is mechanically preferable for the latch to be remote from the axis of rotation of the chinrest. Nevertheless, in another non preferred embodiment of the invention, the lock is located near the zone where the chinrest is articulated on the helmet, in the vicinity around an axis of rotation of the chin guard.

In this embodiment, the unlocking is done either by action of the user on the two locks or by sequences. In the latter case, it is proceeded to unlock the locks one after the other, without the need for action on the lock already actuated.

Referring in particular to the figure 1 , this figure shows a lock that can be used individually or can be part of a locking device being associated with another lock. The lock ensures the locking of a chin strap 18 relative to a portion vis-à-vis a shell 19 of a helmet in cooperation with a locking finger 5 secured to the shell that the latch receives in its interior and locks in a lock position.

• une platine 1 de glissement, avantageusement sensiblement plane, possédant une lame ressort 16 permettant l'ouverture séquencée du verrou, la platine 1 étant appliquée contre la mentonnière 18 du casque et formant une première face d'extrémité du verrou,
• un carénage 1a, avantageusement sensiblement plan, se trouvant sur une seconde face d'extrémité du verrou opposée à la première face d'extrémité portant la platine 1 de glissement et fermant l'ensemble formé par le verrou. Ce carénage 1a peut être sous forme d'une platine portant un trou oblong 17 dont le rôle sera ultérieurement décrit,
• un bouton 2 de commande permettant à un utilisateur d'actionner le verrou par préhension du bouton,
• un basculeur 3 coopérant avec le bouton 2 de commande, ce basculeur 3 formant les moyens de blocage du verrou dans sa position de blocage du verrouillage empêchant un déverrouillage du verrou,
• un loquet 4 destiné à recevoir un élément externe coopérant avec le verrou, avantageusement sous forme d'un doigt 5 de verrouillage, pour son verrouillage à l'intérieur du verrou, l'élément ou doigt 5 étant fixé sur la coque 19 du casque.

Such a lock comprises the following elements:

• a sliding plate 1, advantageously substantially flat, having a leaf spring 16 allowing the sequential opening of the lock, the plate 1 being applied against the chin strap 18 of the helmet and forming a first end face of the lock,
• a fairing 1a, advantageously substantially flat, located on a second end face of the latch opposite the first end face carrying the sliding plate 1 and closing the assembly formed by the latch. This fairing 1a can be in the form of a plate carrying an oblong hole 17 whose role will be described later,
• a command button 2 allowing a user to operate the lock by grasping the button,
• a rocker 3 cooperating with the control button 2, this rocker 3 forming the locking means of the lock in its lock locking position preventing unlocking of the lock,
• a latch 4 for receiving an outer member cooperating with the lock, preferably in the form of a locking finger 5, for locking inside the lock, the element or finger 5 being fixed on the shell 19 of the helmet.

• un ressort 10 associé au bouton 2 de commande qui rappelle le bouton 2 dans une position initiale de verrouillage,
• un ressort 9 associé au basculeur 3 permettant l'engagement du basculeur 3 dans le loquet 4 en rappelant le basculeur 3 vers le loquet 4,
• un ressort 8 associé au loquet 4 et permettant le rappel du loquet 4 dans une position de déverrouillage,
• deux rivets exerçant le rôle d'axe 6, 7 de rotation de l'ensemble bouton 2 de commande et basculeur 3 et respectivement du loquet 4 ainsi que du maintien du verrou et de ses éléments sur la mentonnière 18.

In addition, the or each lock may comprise the following elements which are in particular visible to the figure 2 :

• a spring 10 associated with the control button 2 which recalls the button 2 in an initial locking position,
• a spring 9 associated with the rocker 3 allowing the rocker 3 to engage the latch 4 by returning the rocker 3 to the latch 4,
• a spring 8 associated with the latch 4 and allowing the latch 4 to be returned to an unlocked position,
• two rivets acting as axis 6, 7 of rotation of the control knob 2 and rocker 3 assembly and respectively of the latch 4 and the maintenance of the latch and its elements on the chinrest 18.

Thus, a lock according to the present invention may comprise 11 pieces and a locking device with two such locks may comprise 22 pieces, the locks advantageously being locks positioned on the right and left on the chinrest 18 of the helmet and each comprising 11 pieces.

Referring to all the figures and in particular to the figure 2 , it will now be detailed all the aforementioned elements forming part of a lock.

The sliding plate 1 can be self-lubricated POM, POM being the abbreviation for polyoxymethylene or polyformaldehyde, a material used in automotive and sports and recreation fields for its high tensile and impact strength physical characteristics as well as its excellent fatigue resistance, as well as its low coefficient of friction and good resistance to abrasion.

This plate 1 facilitates a sliding on it of the other elements of the device and comprises a spring blade 16 for releasing release of the lock for sequential unlocking, characteristic of a lock according to the present invention. The leaf spring 16 comprises a slot 15a, such as a hole, for example oblong, traversed by a stud serving as stop 15. The stop 15 is molded with the chinrest 18. The axis 15b symbol corresponds to the axis of passage of an additional retaining screw of the fairing. Indeed, a small self-tapping screw comes through a hole provided for this purpose in the fairing to be housed in a barrel of the chinrest. This advantageously allows an additional maintenance security of the fairing which applies only for this type of embodiment of the invention.

This stop 15 avoids excessive deformation of the leaf spring 16 under the force of the rocker 3 and a spring 9 which is associated with the rocker 3, this spring being advantageously conical and visible at the figure 2 , this when unlocking the lock.

The sliding plate 1 also has a notch 13a serving as a housing for the passage of a stop 13 for the latch 4 during unlocking. This stop 13 comes from molding with the chin strap 18.

The sliding plate 1 also has a passage recess for the axis 6 of rotation common to the button 2 and the rocker 3 as well as a passage recess for the axis 7 of rotation of the latch 4, these pins 6, 7 being in the respective form of a rivet.

The sliding plate 1 carries a control button 2 which can also be self-lubricated POM. This button 2 control allows a user to operate the lock to unlock the chinrest 18, first by releasing the lock from its locking position. The user applies his finger on a gripping appendix 2c of the control button 2 and the button 2 pivots about its axis 6.

The control button 2 also has respectively upper and lower contact edges 2a 2b which are temporarily in contact with complementary edges 3a, 3b of the rocker 3 in the initial position which is a locking position. Finally, the control knob 2 is traversed by a lug 12 on which is wound one end of a spring 10, the other end of the spring 10 being wound around a lug 14 coming from molding with the chinrest 18 of the helmet.

In the initial locking position, the control button 2 presses on the rocker 3, which can be rotated and which can therefore also be self-lubricated POM. This rocker 3, meshing with the latch 4, makes it possible to lock the latch 4 in the locking position of the lock.

The rocker 3 has a lower portion 3c turned towards the control knob 2 and an upper portion 3d opposite the control knob 2 and turned towards the latch 4. It is the edge of this upper portion 3d of the rocker 3 which meshes temporarily in the latch 4, this in particular in the initial locking position to lock the latch 4 in this position.

The rocker 3 also has a nipple 11 for holding the end of a spring 9 wound around the stud 11. The spring 9, preferably conical, recalls the rocker 3 in a locking position of the latch 4 and thus locking. The rocker 3 is traversed by the axis 6 of rotation of the control button 2, axis 6 which is also common to it, the control button 2 and the rocker 3 can pivot about this common axis 6.

The median and lower portion 3c of the rocker 3, in particular visible to Figures 3 to 6 because partially cleared in these figures of an overlap by the control button 2, may have a decreased thickness. This allows the overlap of this median and lower portion 3c by a portion of the control knob 2, itself advantageously of decreased thickness.

It follows that this median and lower portion 3c of the rocker 3 has an upper contact edge 3a that can cooperate in the locking position by being in contact with an upper contact edge 2a of the button 2 located in the overlap portion of the rocker 3 by the control button 2. Similarly, a lower contact edge 3b of the middle and lower portion 3c of the Tipper 3 can cooperate sequentially by mutual contact with a lower contact edge 2b the overlap portion of the rocker by the button 2.

As previously mentioned, the latch 4, also movable in rotation and thus also advantageously self-lubricated POM, cooperates with the rocker 3. The latch 4 allows locking of the lock in a so-called initial position.

Advantageously having a cam shape, the latch 4 carries at its periphery a protrusion 4a for lifting the spring blade 16 carried by the sliding plate 1 during pivoting of the latch 4 induced by the action of the user on the control button 2 with release of latch lock 4 by rocker 3. And retraction movement of chin rest 18.

The latch 4 also has a profile 4b cooperating with the edge of the upper portion 3d of the rocker 3 for meshing these two elements in the initial locking position in which the latch 4 is blocked by the rocker 3. The latch 4 is crossed by a recess accommodating an axis 7 of rotation around which the latch 4 can pivot, the axis 7 being in the advantageous form of a steel rivet.

The latch 4 also has an open housing 4c serving as catching and holding area of the locking finger 5, a complementary element of the lock and fixed to the shell 19. The latch 4 is associated with a pin spring 8 of the latch 4 for its displacement in pivoting away from the locking position, that is to say in the unlocked position in which the locking finger 5 can leave the housing 4c by its opening. To limit this pivoting, the plate 1 of sliding can carry a notch 13a receiving a stop 13 of latch coming from molding with the chinrest 18 and stopping the pivoting of the latch 4 in its unlocked position.

The locking finger 5, serving as a locking element in cooperation with the lock, is advantageously made of stainless steel being attached to the shell 19. It meshes with the latch to be held in position by the latch 4 during the locking. It may include a hemispherical head and a cylindrical trunk.

In contrast to the sliding plate 1, the lock carries a shroud 1a in the form of a metal plate, preferably stainless steel. The shroud 1a makes it possible to close the lock and guide the locking finger 5 towards the latch 4. For this, the shroud 1a has an oblong hole 17, visible at the figure 1 , allowing the passage and the guiding of the locking finger 5 in the latch for its entry into the open housing 4c of the latch 4 or its extraction of the housing 4c.

The fairing 1a therefore closes the lock and blocks the aforementioned elements against the plate 1 and the chinrest 18. The bottom of the oblong hole 17 of the fairing 1a will act as a stop to stop the stroke of the locking finger 5. The oblong hole 17 will also allow the finger to remain in position 5 while being complementary to the latch 4.

The operation of the lock is as follows. As shown in figure 2 , once under the pressure of the rocker 3, the latch 4 prevents the locking finger 5 out of the lock. The locking of the finger 5 thus induces a maintenance in the closed position of the chinrest 18 in this locking position, also known as the initial position. In the case of a shock, the chinrest 18 will tend to open, thus applying significant forces between the latch 4 and the locking finger 5.

The locking finger 5 tends to describe a circular path dictated by the axis of rotation of the chinrest 18 on the shell 19 and will therefore apply a force on the latch 4, forcing the latter to rotate about its axis 7, advantageously in the form of a steel rivet.

The pivoting of the latch 4 is however blocked by the contact with the rocker 3, this by the contact between the profile 4b of the latch 4 with the upper portion 3d of the rocker 3. This forms the locking position of the latch 4 that takes the rocker 3 when locking the lock. The force will therefore be transmitted to the rocker 3 and then to the axis 6 of the rocker 3, this axis 6 being advantageously in the form of a steel rivet. The lock forms a whole that will maintain in position the locking finger 5 and thus block the chinrest 18 relative to the shell 19.

To the figure 2 , the edge of the upper portion 3d of the rocker 3 is fully engaged against the profile 4b of the latch 4 and pressed against it by the pressure of its spring 9. The latch 4 is constrained by its spring 8 and is also forced to a support against the rocker 3, which allows a stable locking of the latch 4. The sliding plate 1 is in its rest position, namely, a leaf spring 16 unconstrained. The locking finger 5, serving as an element cooperating with the lock, fixed on the shell 19 is embedded between the latch 4, the rocker 3 and the shroud 1a, which allows the locking of the rotation of the chinrest 18.

It will now be described the steps of the unlocking method of the latch which ends with the release of the locking finger 5 by the latch 4.

According to a first step of this method, according to the positioning of the lock shown in FIG. figure 2 for unlocking, the first step is initiated by the action of a user on the control button 2, by the gripping appendix 2a pushed by at least one finger of the user. By its action on the control button 2, the user will then push the rocker 3 in rotation about its axis 6 which is also the axis of rotation of the control button 2. The rocker 3, acting as locking means of the lock, will then be placed in the lock release position of the latch 4 of the lock.

As it is shown in figure 3 , the rotation of the rocker 3 implies an uprising of the leaf spring 16 under the action of the rocker 3 by contact with the edge of the upper portion 3d of the rocker 3 on the free end portion 16b of the leaf spring 16. This blade spring 16 will deform to let pass the upper portion 3d of the rocker 3.

As shown in figure 4 once the upper portion 3d of the rocker 3 has passed the spring blade 16, the upper portion 3d of the rocker 3 will be housed above the free end portion of the spring blade 16. The pivoting of the latch 4 is therefore no longer blocked by the rocker 3, because the rocker 3 can not return against the latch 4 due to the blocking by the free end 16b of the leaf spring 16. It follows a release of the locking means of the latch 4 that formed the rocker 3.

If the appendage 2a gripping button 2 control is released by the user, the button 2 is returned to its initial position before unlocking by its spring 10, visible at the figure 2 . However, according to one characteristic of the invention, when the action of the user stops on the control button 2, the lock release position of the lock remains stable when the button 2 is returned to the initial position.

As it is shown in figure 4 , the rocker 3 is pivotally locked by the free end 16a of the leaf spring 16, so in a release position of the latch 4. The free end 16a of the leaf spring 16 then acts as holding means in the position of unblocking of the rocker 3.

As it can be seen at the figure 4 while referring to the figure 2 for references not mentioned in the figure 4 , in the case where the user releases the pressure on the control button 2, this button 2 will then be returned to its rest position by its spring 10. The rocker 3, pushed by its spring 9, will come into contact with the spring blade 16 of the plate 1, by abutment against the free end 16b of the spring blade 16. This stop will allow to keep the latch 4 freely pivoted and released from its blocking position by the rocker 3.

This locking release position latch 4 is a stable intermediate position sequentially located between the actuation of the button 2 triggering the unlocking process and a retraction action of the chinrest 18 terminating the unlocking process, preferably by pivoting to the top and the back of the helmet.

In this configuration, the control button 2 is in its rest position, namely, returned to its initial position by its spring 10. The rocker 3 is pushed by its spring 9 and abuts against the top of the free end 16b of the leaf spring 16 of the plate 1. The latch 4 is constrained by its spring 8, preferably a pin spring to its unlocked position. However, the locking finger 5 acting as an element associated with the latch and fixed on the shell 19 and the weight of the chinrest 18 prevent the latch 4 from opening.

In the locking and locking position of the latch 4 by the rocker 3, as shown in FIG. figure 2 , the latch 4 and the rocker 3 are on the same side of the spring blade 16. In the unlocking position of the rocker 3, as shown in FIG. figure 4 , the free end 16b of the leaf spring 16, having a tip shape, is interposed between the rocker 3 and the latch 4.

To the figure 4 , the upper portion 3d of the rocker 3 is pushed against the free end 16a of the leaf spring 16 under the action of its associated spring 9, preferably conical. The weight of the chinrest 18 however exerts a force on the latch 4 which is greater and in opposition to that of its spring pin 8 reminding it to an unlocking position, that is why the latch 4 does not open from him. even.

The rocker 3 can not return under the action of its spring 9 in its rest position which is the locking position of the latch 4 because the spring blade 16 blocks its return movement. The latch 4 is thus ready to be unlocked and it is sufficient that the user performs a retraction action of the chinrest 18, for example a raising thereof for the locking finger 5 leaves the open housing 4c of the latch 4, as will now be explained.

With particular reference to Figures 5 and 6 , the second step of the sequential unlocking of the lock is as follows. Once, the upper portion 3d of the rocker 3 being above the free end portion 16b of the spring blade 16, the latch 4 is ready to pivot to release the locking finger 5. When pivoted, the latch 4 can lift a projecting portion 16a to the latch 4 carried by the leaf spring 16 by its protrusion 4a.

This pivoting of the latch 4 is caused by an action of the user on the chinrest 18 to place it in the retracted position, for example by lifting. The chinrest 18 can then describe a rotational path around its axis of rotation on the shell 19. By actuating the chinrest 18, the locking finger 5 attached to the shell 19 will therefore drive the latch 4 pivotally.

The pivoting of the latch 4 induces a passage of its protrusion 4a under the leaf spring 16 and will lift it. The leaf spring 16 will deform sufficiently to release in turn the rocker 3. This is shown in the figure 5 .

The rocker 3 will then come to reposition against the latch 4 at the end of its pivoting in the unlocked position. This is shown in the figure 6 .

Once the chinrest 18 sufficiently open, the locking finger 5 completely out of the lock, leaving the housing 4c open on the latch 4. A portion of the latch 4 is then pressed against the rocker 3 by the action of its pin spring 8 , the protuberance 4a of the latch 4 being in abutment against a portion vis-à-vis the rocker 3.

The rocker 3 is itself pressed against the latch 4 by means of its spring 9 advantageously conical, the control knob 2 being biased towards the chinrest 18 by virtue of its traction spring 10 if this return has not already been made, this recall being done when the user stops his action on the button 2 command.

What has been described corresponds to a sequenced unlocking. Other forms of unlocking are also possible according to the present invention. For example, the user can continue to exert by his hand a pressure on the control button 2 during unlocking.

In this configuration, the control button 2 does not return to the initial position and the upper portion 3d of the rocker 3 will then remain above the free end 16b of the leaf spring 16 of the plate 1. This configuration does not imply however no malfunction and is invisible to the user. Nevertheless, it is not advantageous because it does not allow a release of the user's hand, this hand remaining pressed against the control button 2.

The method according to the invention also comprises an automatic locking step. To lock the chinrest 18, it must be folded on the shell 19 in the non-retracted position, that is to say in the "integral" position. The chin strap 18 will describe a circular path until the fixed locking finger 5 is engaged again to the shell 19 in the lock.

This finger 5 will thus cause the latch 4 to pivot until it regains its locking position. It is the bottom of the oblong hole 17 carried by the fairing 1a in the form of a plate for example metal which will play the role of stop to stop the progression of the finger 5.

In the case of a lock following a non-sequenced unlocking as previously mentioned, therefore without releasing by the user of the control button 2, as the upper portion 3d of the rocker 3 has remained above the free end 16b the spring blade 16 of the plate 1 during unlocking, when locking the latch 4 will lift the leaf spring 16 of the plate 1 to release the rocker 3 and the lock can continue as previously described.

• actionnement d'un bouton 2 de commande dudit au moins un verrou par un utilisateur à partir d'une position initiale correspondant à un verrouillage de la mentonnière 18 en position non escamotée sur la coque 19 et à un blocage du verrou dans cette position, ceci avantageusement par contact d'au moins un doigt de l'utilisateur avec l'appendice 2c de préhension du bouton 2 de commande.
• mise en position de libération de blocage dudit au moins un verrou, la mentonnière 18 restant en position non escamotée sur la coque 19, ceci par libération de l'action de blocage qu'exerçait le basculeur 3 sur le loquet 4,
• relâchement du bouton 2 de commande par l'utilisateur et retour en position initiale du bouton 2 de commande avec maintien stable de la position de libération de blocage du verrou lors du retour en position initiale du bouton 2,
• action de l'utilisateur sur la mentonnière 18 pour son escamotage ou action séquentielle de l'utilisateur sur un second verrou pour son déverrouillage.

Thus, a method of unlocking said at least one lock may comprise the following steps:

• actuation of a button 2 for controlling said at least one lock by a user from an initial position corresponding to a locking of the chin guard 18 in the non-retracted position on the shell 19 and locking the lock in this position, this advantageously by contact of at least one finger of the user with the appendage 2c gripping button 2 control.
• setting in the locking release position of said at least one latch, the chinrest 18 remaining in non-retracted position on the shell 19, this by release of the locking action exerted by the rocker 3 on the latch 4,
• release of the control button 2 by the user and return to the initial position of the control button 2 with stable maintenance of the latch release position of the lock when the button 2 is returned to the initial position,
• action of the user on the chin 18 for its retraction or sequential action of the user on a second latch for unlocking.

As illustrated in figure 7 which shows a beginning of locking process, the locking is initiated by an action of the user on the chinrest 18 causing a support of the latch 4 with the finger 5, the support of the latch 4 on the locking finger 5 under the action of the user causing the latch 4 to pivot towards its locking position.

The release of the stable maintenance of the rocker 3 during pivoting of the latch 4 is then performed by pressing the latch 4 on the rocker 3 until the rocker 3 comes to automatically mesh in the latch 4, thanks to the return spring 9 associated with the rocker 3. This marks the end of the pivoting of the latch 4 to its locking position with locking latch 4 in said pivotal locking position of the rocker 3 returned to its locking position. The lock is automatically found in its locked position.

If the user actuates again, especially inadvertently, the control button 2 when the lock is unlocked, so with a chinrest in the retracted position, advantageously but not limitatively in the "Jet" position towards the rear of the helmet, the rocker 3 passes over the spring blade 16. This case is provided for the lock and does not prevent automatic locking. Indeed, in this case, the pivoting of the latch 4 will sufficiently lift the leaf spring 16 to release again the rocker 3 and allow the meshing and locking of the latch 4.

When locking, the latch 4 by entering pivoting will thus lift the rocker 3, which will in turn lift the leaf spring 16. It is mainly the spring 9, preferably conical, rocker 3 which will allow the meshing and therefore locking by locking the latch 4 by the rocker 3.

The main advantage of such an automatic locking is that it is performed by simply flap the chinrest in the non-retracted position "Integral", and one-handed.

According to the present invention, for a chin strap 18 comprising a single latch, when unlocking, it can be proceeded to an actuation of the control knob 2 by the user and then to a release of the pressure of the user on the button 2 of control to then actuate the retraction of the chinrest 18, which forms a sequential release.

Alternatively, it can be maintained user pressure on the control button 2 while performing the retraction of the chinrest 18, which forms a non-sequential unlocking.

• un déverrouillage séquentiel par actionnement du bouton 2 de commande d'un seul verrou se trouvant avantageusement sur un côté de la coque 19, puis de l'autre verrou se trouvant de l'autre côté de la coque 19, ces déverrouillages étant suivis par un escamotage de la mentonnière 18, vers une position relevée avantageusement par basculement en position « Jet » effectué par l'utilisateur, la ou les mains de l'utilisateur étant libres pour effectuer l'escamotage,
• un déverrouillage semi-séquentiel: actionnement du bouton 2 d'un côté, puis actionnement du bouton 2 de l'autre côté et escamotage de la mentonnière 18 dans le même geste, le doigt d'une main de l'utilisateur restant en pression sur le second bouton 2 tandis que la même main de l'utilisateur effectue l'escamotage de la mentonnière 18. Une autre possibilité non préférée de déverrouillage semi-séquentiel consiste à actionner le bouton 2 avec une première main, et d'effectuer l'escamotage de la mentonnière d'une deuxième main- un déverrouillage simultané: actionnement des deux boutons, avantageusement par un doigt d'une main différente de l'utilisateur pour chaque bouton et escamotage de la mentonnière dans le même geste par le reste des doigts des mains de l'utilisateur. Les deux doigts restent en pression sur les deux boutons des verrous lors de l'escamotage et donc ces boutons 2 ne reviennent pas en rappel dans leur position initiale dite de verrouillage.

According to the present invention, for a chin strap having two locks respectively disposed on one side of the chinrest 18, there are several unlocking procedures:

• a sequential unlocking by actuation of the control button 2 of a single lock advantageously located on one side of the shell 19, then the other lock on the other side of the shell 19, these unlocking being followed by a retraction of the chin strap 18, to a position advantageously raised by tilting in the "Jet" position performed by the user, where the user's hands are free to perform the retraction,
• a semi-sequential unlocking: actuation of the button 2 on one side, then actuation of the button 2 on the other side and retraction of the chinrest 18 in the same gesture, the finger of a hand of the user remaining under pressure on the second button 2 while the same hand of the user performs the retraction of the chinrest 18. Another non-preferred possibility of semi-sequential unlocking is to operate the button 2 with a first hand, and perform the retraction the chinrest of a second hand- a simultaneous unlocking: actuation of the two buttons, preferably by a finger of a different hand of the user for each button and retraction of the chin in the same gesture by the rest of the fingers of the hands of the user. The two fingers remain in pressure on the two lock buttons during the retraction and thus these buttons 2 do not return in their initial locking position.

Similarly, many automatic locking procedures are possible, which respectively form the counterpart to unlocking procedures previously indicated. Two non-limiting examples of locking procedures among other procedures will now be given.

As a first example, a lock can be made with two control knobs 2 in the rest position. If the unlocking procedure was performed in a standard manner with release buttons 2 by the hands of the user, when the chinrest 18 is in the retracted position, preferably "Jet", then the rockers 3 are located under the free end 16b of the respective leaf spring 16. In this configuration, the automatic lock is preserved.

As a second example, a lock can be made with one or two actuated control buttons 2. If, when using the helmet with chinrest 18 retracted, advantageously in "Jet", one or two buttons 2 control come to be actuated, the upper portions 3d of the rockers 3 of the two locks will then reposition themselves over the ends However, in this configuration, the automatic locking is preserved.

For a lock according to the present invention or an unlocking and locking device comprising two locks according to the present invention, their main advantage is their size and weight reduced because of their integration into the helmet. Such a lock or unlocking device allows direct actuation without intermediate device thus limiting the weight and overall size of the helmet and equipped.

For each lock, the control button 2 is disengageable relative to the rocker 3 thus allowing its return to rest with each use. Thus, the control button 2 is not linked to the rocker 3 during locking, its possible blocking by an external object (scarf, jacket ...) will not prevent the locking of the device.

The stroke to be performed by the control button or buttons 2 to unlock the mechanism is chosen to be long enough to avoid any risk of inadvertent unlocking.

For a device for unlocking and locking with two locks, the security of the device is increased by the independence of the two locks.

The invention is not limited to the previously described embodiments and extends to all the embodiments covered by the claims. REFERENCES 1. Platinum 16. Spring blade 1a. Fairing 16a. Protruding portion 2. Button 16b. Free end 2a. Upper contact edge 17. Oblong hole 2b. Lower contact edge 18. Chinrest 2c. appendix 19. Hull 3. Tipper 3a. Upper contact edge 3b. Lower contact edge 3c. Lower portion 3d. Upper portion 4. Latch 4a. excrescence 4b. Profile 4c. Housing 5. Finger 6. Axis 7. Axis 8. Pin spring 9. Spring 10. Spring 11. Teton 12. Ergot 13. Stop 13a. nick 14. Ergot 15. Stopper 15a. Light 15b. Axis

Claims (14)

1. Lock for a retractable helmet chinguard (18), the lock comprising a control button (2) that can be actuated by a user from an initial position of the button corresponding to a blocking of the chinguard and means for blocking the lock in the initial position, the lock being configured such that an action of the user on the control button (2) places the blocking means in a release position enabling a retracting movement of the chinguard (18), characterised in that the blocking means are configured such that the release position remains stable after releasing the action of the user on the button (2) and during the return into the initial position of said button (2) and wherein the blocking means comprise a tipper (3), said tipper (3) being mobile in order to go from a configuration in contact with a latch (4) in the initial position, to a configuration without contact with the latch (4) in the release position.
2. Lock according to the preceding claim, which supports an axis (6) of rotation for the control button (2), the action of the user on the control button (2) making a pivoting of the button (2) around the axis (6) thereof, a latch (4) being mobile between the initial position and a release position, the tipper (3) blocking the latch (4) in the initial position, the tipper (3) being mounted pivoting around the same axis (6) of rotation as the control button (2) and having at least one contact zone (3a, 3b) cooperating with a contact zone (2a, 2b) of the control button (2) for the transmission of the pivoting of the control button to the tipper (3) up to the release position, the tipper (3) being held in the release position by the holding means, abutting against a pivoting of the tipper (3) towards the blocking position thereof of the latch (4), the tipper (3) being returned into the blocking position thereof by a spring (9).
3. Lock according to the preceding claim, which comprises a sliding deck (1) supporting the control button (2), the tipper (3), the axis (6) sharing the control button (2) and the tipper (3), the latch (4) and an axis (7) of rotation of the latch (4), the deck (1) having holding means, said holding means can be a spring blade (16) of which one free end (16b) holds the tipper (3) in the blocking release position thereof by forming said means for holding in position, the control button (2) being returned into the initial position thereof under the action of a spring (10) as soon as the action of the user on the control button (2) stops.
4. Lock according to the preceding claim, wherein the latch (4) is mounted pivoting around the axis (7) thereof through the deck (1), the latch (4) having on the periphery thereof, on the one hand, a profile (4b) contacting an upper portion (3d) of the tipper (3) opposite a contact edge (3b) of the tipper (3) cooperating with a contact edge (2b) of the control button (2), the contact edges (2b, 3b) forming part, respectively, of the contact zones (2a, 2b; 3a, 3b) respectively of the tipper (3) and of the button (2) and, on the other hand, an excrescence (4a) contacting the spring blade (16) after unblocking the latch (4) during the pivoting thereof around the axis (7) thereof towards an unlocking position.
5. Lock according to the preceding claim, wherein the pivoting of the latch (4) from the blocking release position thereof towards an unlocking position is made during a retracting action of the chinguard made by the user.
6. Lock according to any one of the two preceding claims, wherein, in the locking position, the latch (4) and the tipper (3) are on the same side of the spring blade (16), while holding in the blocking release position of the tipper (3), the free end (16b) of the spring blade (16), having a pointed shape, is interleaved between the tipper (3) and the latch (4).
7. Lock according to the preceding claim, wherein, at the start of pivoting of the latch (4) after the unblocking thereof, the excrescence (4a) of the latch (4) contacts a protruding portion (16a) opposite, being located towards the free end (16b) of the spring blade (16) and has a sufficient height for the lifting of said portion of the spring blade (16) enabling the passage of the upper portion of the tipper (3) from the other side of the free end (16b), in pointed shape of the spring blade (16), the free end (16b) abutting the upper portion of the tipper (3) against a return towards the blocking position thereof of the latch (4).
8. Lock according to any one of claims 3 to 7, which comprises a fairing (1a), the fairing (1a) and the sliding deck (1) each being located on one of two opposite sides of the lock, the fairing (1a) comprising an oblong hole (17) intended to guide a locking finger (5) entering into and intended to be locked by the lock.
9. Helmet comprising a shell (19) on which is hinged a retractable chinguard (18), characterised in that it has at least one lock according to any one of the preceding claims.
10. Helmet according to the preceding claim, wherein said at least one lock is fixed to the chinguard (18), whereas a locking finger (5) fixed to the shell (19) of the helmet is locked by said at least one lock.
11. Method for unlocking at least one lock of a retractable chinguard (18) hinged on a helmet shell (19) according to any one of the two preceding claims, characterised by the following steps:

    - actuation of a control button (2) of said at least one lock by a user from an initial position corresponding to a locking of the chinguard (18) in the non-retracted position on the shell (19) and to the blocking of the lock in the initial locking position,

    - putting said at least one lock in the blocking release position, the chinguard (18) remaining in the non-retracted position on the shell (19),

    - release of the control button (2) by the user and return into the initial position of the control button (2) with the stable holding in the blocking release position of said at least one lock during the return into the initial position of the button (2),

    - action of the user on the chinguard (18) for the retraction thereof or sequential action of the user on a second lock for the unlocking thereof.
12. Method according to the preceding claim, wherein, when the action of the user is done sequentially on a second lock, it is proceeded with repeating the steps of actuating a control button (2), putting in the blocking release position and releasing the control button (2) of the second lock by the user with a return into the initial position of the control button (2) and the stable holding of the blocking release position of the second lock during the return into the initial position of the button (2), these steps being followed by the action of the user on the chinguard (18) for the retraction thereof.
13. Method according to claim 11, wherein, when there are two locks of the chinguard (18), it is proceeded, for the two locks, with steps of actuating the control buttons (2), putting in the blocking release position, releasing and returning the control buttons (2) into the initial position thereof with the stable holding of the unlocked positions of the two locks during the return into the initial position of the buttons (2), these steps being carried out on the two locks, and followed by the action of the user on the chinguard (18) for the retraction thereof.
14. Method according to any one of the three preceding claims, wherein the blocking release of said at least one lock is done by the pivoting of a latch (4) returned towards an unlocking position from a locking position with blocking of the latch (4), the latch (4) receiving a locking finger (5), temporarily rigidly connecting it to the shell (19) in the locking position, the unlocking being done according to the following steps:

    - releasing the blocking of the latch (4) by the pivoting of a tipper (3),

    - stable holding in the blocking release position of the tipper (3),

    - pivoting of the latch towards the unlocking position thereof carried out by an action of the user on the chinguard and enabling the retraction thereof into the unlocking position of the latch by disconnecting the locking finger from the latch.

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