WO1996013993A1

WO1996013993A1 - Device for attaching a sight-protecting shield to a headpiece

Info

Publication number: WO1996013993A1
Application number: PCT/IB1995/000959
Authority: WO
Inventors: Nicolas Simone
Original assignee: Boucard, Philippe
Priority date: 1994-11-04
Filing date: 1995-11-02
Publication date: 1996-05-17
Also published as: FR2726437A1; FR2726437B1; AU3707595A

Abstract

A device for attaching a sight-protecting shield (40) or a pair of spectacles to a shadeless headpiece (5) or a headband. The device includes a single central rail (10) on the front surface of the headpiece (5) or headband, or under the front surface of an internal housing for the shield or spectacles located at the front of the headpiece or headband, a movable member (20) to which the shield and spectacles are attached being slidably fitted on or in said rail, and the rail (10) being no shorter than the shield or spectacles are wide. The rail arranged at the top of the wearer's forehead is suitably bent to fit the curvature of the headpiece (5) or headband in that area.

Description

DEVICE FOR FIXING A PROTECTIVE SCREEN FOR VIEW TO A HEAD COVER

The present invention relates to a device for fixing a sight protection screen, or a pair of glasses, to a head covering, and more particularly to a head covering without a visor such as a helmet, hat, cap, even semi-rigid headband or cap worn upside down, this device allowing the screen or the glasses to be moved from a stowed position located at the wearer's forehead to a position of use before the eyes . A headgear thus supplemented with a protective screen, for example, a pair of sunglasses, is particularly appreciated by people who never know how to organize themselves to simply store this screen or this pair of glasses without cluttering and to rearrange immediately when necessary.

Protective helmets are already known, for example, for bikers, comprising a transparent protective screen held by two lateral pivot points situated on a horizontal axis of rotation passing approximately at the level of the wearer's temples. However, this method of attachment is normally limited to rather large screens: that is to say, practically going from one ear to the other.

Document US-A-3 081 460 and document DE-A-2 041 485 describe helmets of a fighter jet pilot in which one or more protective screens are mounted on a pair of lateral support rails bordering so underlying a protective front face attached to the top of the helmet to form an internal housing of the screen or screens. To operate a screen, there is then provided a third central guide rail fixed against the helmet, and on which a carriage slides. A cylindrical pin protruding from the carriage crosses a circular orifice formed in the upper edge of the screen, as well as a longitudinal slot made in the middle of the front face, the end of this pin carrying a positive gripping and locking button in any point along the rail. However, this particularly complex and expensive arrangement is only justified for professional equipment.

Document US-A-2 761 145 describes a pair of glasses with telescopic arms with internal springs, the ends of which are mounted in rotation at the level of the ears to a headband. Too complex to carry out, and too fragile over time, the use of this device has never spread. Document FR-E-66 810 discloses a helmet without visor supplemented by a pair of glasses held at two points: one at the level of each lens. Each fixing device includes a small vertical slide fixed on the front wall of the helmet, a tenon with a braking device limiting the sliding of this tenon in the slide, and a ball at the end of the tenon on which the fork is tightened top of a vertical telescopic rod. Each lower end of the rods supports a second ball joint on which the pair of glasses is articulated. We can therefore adapt the glasses to eye level by adjusting the studs along the slides and / or telescopic rods.

This rather expensive double device is in fact made necessary by the use of telescopic rods and ball joints having no positive means of anti-rotation and braking. In addition, a ball joint being a joint formed of a spherical part rotating in a hollow housing according to a large cone of clearance, there is obtained a superfluous degree of freedom, namely a lateral movement in which the pair of glasses is no longer centered compared to the nose. This too complex device is in practice difficult to adjust. Finally, the retraction of the pair of glasses is carried out by simple rotation upwards, which, in the case of curved glasses, leaves a rather unsightly whole.

Document WO 93/22946 discloses a fixing device comprising an upper hinge fixed in the middle of the lower front edge of a helmet, this hinge being extended by a telescopic arm connected by a lower hinge to the center of a pair of glasses. Means for temporarily maintaining the open position of the hinges comprise notches on the edge or on the internal faces of the female hinges; and means for temporarily maintaining the length of the telescopic arm include bosses formed on the rod and penetrating into orifices formed in the tubular body of the telescopic arm.

The pair of glasses is then retracted by double rotation: anticlockwise for the upper hinge when the telescopic arm is raised against the helmet, and clockwise during folding the pair of glasses against the arm, the bending of the pair of glasses then elegantly matching the shape of the helmet. However, in practice, users have been quite confused and uncomfortable with this long-travel movement. Document EP-A-0412 737 describes a central device requiring a visor of the head cover for the installation of an oblique underlying rail for attaching a vertical sunscreen to a carriage movable along this rail, and on which it can be stopped by notches. However, this rail allows only an adjustment from front to back of the position of use of the screen, its storage being effected by raising it against the visor, where it then constitutes rather a nuisance.

Document US-A-2 274 222 discloses a relatively simple device for attaching a protective screen to a construction helmet, this device being based on a single central rail riveted under the helmet, and to which the middle of the edge is attached reinforced upper of the screen by means of a rivet as well illustrated in the second figure. However, the installation of this rivet is delicate in that it must be compressed to a very exact value to obtain just sufficient friction contact allowing on the one hand easy movement from one position to another, and d on the other hand the effective maintenance in time of the last position. Above all, nothing prevents the screen from turning around the rivet, and therefore from accidentally shifting with respect to one or both eyes. For a screen intended to come and land directly on the nose, it is then necessary to provide two rails, as illustrated in the third figure, which complicates the device and its handling.

The object of the present invention is a simplified device for attaching a pair of glasses or a screen for protecting sight to a headgear without visor or to a headband, in particular a device based on a single rail. central located substantially at the level of the wearer's forehead, this device allowing the screen to be put in place and their retraction by an easy, rapid and precise movement thanks to adequate guidance. This device must also make it possible to temporarily maintain this pair of glasses or screen rigidly and reliably at any desired point, either by rapid voluntary jamming or by duly controlled friction forces.

If possible, the layout of the rooms should allow subsequent installation on existing headgear, as well as the easy change from one screen to another screen of different characteristics. The constituent parts of this device must be able to be strong enough not to break after multiple manipulations. Above all, the design and structure of the constituent parts must be simple enough to allow mass production at reduced cost, in particular by injection of plastic material. These goals are achieved by a device for attaching a sight protection screen, or a pair of glasses, a headgear without visor or a headband allowing the movement of the screen or glasses from a stored position to a position of use, this device comprising a single central rail fixed or arranged in the middle on / in / under the front face of the headgear or the headband, or of the front face of an internal housing for the screen or the glasses attached to the front of the headgear or the headband, because a carriage attached to the rail is movable only when sliding, and because the screen or the glasses are rigidly attached to the carriage in the plane of the rail; or conversely, the end of the rail being rigidly fixed in the middle of the upper edge of the screen or glasses, and the carriage being attached or arranged in the middle of the headgear or headband.

Advantageously, the rail is located on the top of the wearer's forehead, has a length substantially identical to that of the screen, and is arched to follow the curvature at this level of the headgear or the headband.

By rail is understood as well a longitudinal guide, for example, a groove, a slide or a part of cross section in inverted T, or two parallel guides, and on which runs a part in rolling or sliding in the longitudinal direction; the attachment of the carriage to the rail, on the other hand, preventing any rotation from going across. The movement of setting up or retracting the screen or glasses then consists of a simple vertical translation in the plane of the rail along the curve of the front.

According to an advantageous embodiment rather provided for a helmet, the screen, or the glasses are attached to the carriage by one or more extension arms parallel to the rail and preferably arched with the same curvature as the rail. Such an extension arm then makes it possible to shift the fixing device towards the rear, either to leave the front part of the helmet available for the addition of a visor or other element, or to arrange the carriage in a more accessible part. helmet giving a feeling of "remote control", or to obtain an original aesthetic effect.

Then, the rail can in any case be long enough so that, from the position of use at eye level, the screen or the glasses can be lifted all along the forehead to be fully retracted on or in the helmet. Furthermore, the curvature of the extension arms ensures that the screen or the glasses are always correctly folded towards the eyes of the wearer. Preferably, the carriage is provided with a button or a gripping rod making it possible to act directly on this carriage to move it along the rail, and not by action on the screen or the glasses which are do not want to dirty. When the carriage moves on a rail located under the front face of an internal housing, then the handle of the carriage emerges from a longitudinal opening of the face and formed parallel to the middle or to the side of the rail.

Usefully, the rail comprises in its lower part before a stop stop preventing the fall of the screen or glasses; and in its upper rear part a surmountable stop by which the carriage can be disengaged for exchange of the screen or glasses.

According to a first embodiment, the rail is in the form of two guides connected by a central strip fixed against the front face, and the carriage comprises a rectangular plate whose curved longitudinal edges are clipped to the guides, this carriage being dimensioned so that it can slide freely along the rail. This carriage is then completed by a device for voluntary blocking of its position, which may include a lever mounted in rotation, the internal branch of which is a cam capable of jamming against the rail or against the face of the helmet, and the other branch of which constitutes a gripping rod.

According to a second embodiment, the rail is in the form of a longitudinal opening formed in the front face or in a strip fixed against the front face with a certain spacing, and the carriage is in the form of a body longitudinal median of width identical to the opening where it is held by a lower tab and a larger upper gripping button, the screen or the extension arm being either integral with the tab or button, or clamped between the tab and the front face or between the button and the front face, the height of the body being dimensioned as a function of the thickness of the opening, and possibly of the thickness of the screen or of the extension arm crossed, such so that the attachment of the carriage to the rail generates predetermined friction forces making it possible to move it without excessive effort and to maintain it in any position along the rail.

In this embodiment, the surmountable rear stop is a transverse opening in T or in Y of width greater than that of the tongue lower of the carriage, transverse opening whose rear edge is flexible for lowering, when desired, below the tongue.

This embodiment of rail by longitudinal slot lends itself better to the production of plastic parts injected in large numbers, therefore at reduced cost. The attached band device allows you to equip existing bicycle or mountain helmets.

According to a third embodiment, the end of the rail is rigidly fixed in the middle of the upper edge of the screen or glasses, and the carriage secured to the helmet is in the form of a tube of section identical to the rail fixed to outside or inside the front face; or in the form of two successive openings, of section identical to the rail, formed in the front face, and in which the rail passes from the inside of the front face towards the outside, then back towards the inside, or vice versa . In the last configuration, the openings have chamfered edges in the plane of passage of the rail.

This rather rustic embodiment, although very solid, is particularly suitable for construction helmets. Advantageously, the external face of the rail has grooves facilitating the manual movement of the rail.

According to a fourth advantageous embodiment, rather intended for a headband, the sight protection screen or the pair of glasses is slidably connected to a second rail secured to the sliding carriage itself along the first central rail . The two rails preferably have a substantially identical length. Thus, the first rail makes it possible to lower the screen or the glasses at least to the height of the forehead, the second rail allowing the positioning in front of the eyes.

Preferably then, the internal lateral sides of the rails are oblique oriented towards the headband, and the sliding connections of the carriage in the first rail and of the screen or glasses in the second rail are produced by a tail assembly. dovetails.

This method of assembly is advantageous because of its small thickness, in particular reduced to the thickness of the rail. The two links then having no interference, we can slide the screen along the second rail even though the latter is still located on the first. In addition, we can more easily adjust the friction forces to a predetermined value, either by spacers, or by an offset of the angles of the contact faces.

Preferably also, the first rail comprises lateral flanges for guiding the second rail. The internal lateral faces of these guide edges can also be oblique oriented towards the headband; and the sides of the second rail can be chamfered in correspondence, this second rail being thus slightly kept pressed against the first.

Preferably then, the attachment of the first rail to the headband comprises a rear blade intended to pass behind the headband, this blade being connected at one end by a hinge to one of the ends of the first rail, preferably the 'lower end, this blade being provided at its other end with a hook coming on the other end in correspondence of the first rail.

Usefully, the device according to the invention comprises means for remote control of the movement of the carriage along the rail.

The invention will be better understood from the study of an embodiment taken without any limitation being implied and illustrated in the appended figures in which:

FIG. 1 is a perspective view of a first embodiment of the invention applied to the external face of a helmet,

FIG. 2 is a perspective view of a second embodiment of the invention also applied to the external face of a helmet,

FIG. 2a is a view in longitudinal section of the carriage of the device of FIG. 2,

FIG. 3 is a perspective view of an internal variant of the embodiment of FIG. 1 applied to a half-shell coming to be fixed on a helmet to constitute an internal housing,

FIG. 4 is a perspective view of an internal variant of the second embodiment using, in addition, an extension arm,

FIG. 4a is a view in longitudinal section of the carriage of the device of FIG. 4, FIG. 5 is a perspective view of a third embodiment of the invention,

FIG. 6 is a side view of another variant of the embodiment of FIG. 4 applied to the windshield screen of an integral helmet, FIG. 7 is an exploded perspective view of a fourth embodiment of the invention applied to a headband, and

- Figures 7a and 7b are respectively sectional views of the embodiment of Figure 7 along planes (a) and (b).

In Figure 1 is illustrated a helmet 5, for example, for the protection of the head of a cyclist. This helmet is supplemented with ventilation openings 8 as well as a sun screen 40 capable of being completely lowered to a position of use before the eyes or entirely raised in a storage position on top of the face. helmet front 5.

More particularly according to a first embodiment of the invention, the device for fixing the sunscreen 40 on the front external face of the helmet 5 comprises a single vertical and arcuate rail 10 to match the curvature, at this level, of the helmet 5. This rail 10 can consist of two cylindrical beads connected by a central strip 12. This central strip 12 can be directly bonded at 18 to the helmet 5 or retained by a temporary assembly, for example, by a strip sold under the name "VELCRO". The lower end of the rail 10 is terminated by an insurmountable front stop 14, while the upper end is terminated by a rear stop 16 in the form of a double cone, therefore passable by momentary elastic deformations of the rail 10.

On this rail 5 is engaged a carriage 20 which is, in this example, in the form of a rectangular plate with lateral edges rounded in a semicircle so as to be clipped from the outside onto the rail 10. In the example illustrated , the width of this rail 10 is such that this clipping takes place without friction allowing free sliding of the carriage. On the other hand, the length of the carriage 10 is sufficient to prevent it from jamming crosswise.

Alternatively, this rail 20 may have an inverted T cross section in relation to a carriage having an inverted U cross section. The vertical branch of the rail can then comprise one or more longitudinal grooves in which one or more internal studs for hooking the carriage to the rail engage.

This carriage supports a pair of lateral suspension arms 24 attached, at their upper end, to a transverse support bar 22 of the trolley and holding, at their lower end, a transverse fastener 25 for the sunscreen 40. If the transverse holding bar 22 has been illustrated in this figure in the upper part of the trolley, it can also, without other, be located on the lower front of this same cart. Alternatively, the end of his arms can be bent and fixed directly to the cart. Furthermore, these suspension arms 24 are also arched with a curvature similar to that of the rail 10, which makes it possible to keep the sunscreen 40 folded down in an elastic manner, therefore close to the eyes in the position of use.

Considering that the front lower edges of the helmets are normally positioned in the middle of the wearers' fronts, the length of the arms 24 must be such that, when the carriage 20 is located against the lower stop 14, these arms support the fastener 25 at height eyebrows. In other words, this arm length is of the order of 3 to 5 centimeters. Furthermore, the length of the rail 10 must be such that, when the carriage 20 is in abutment against the rear stop 16 in the fully retracted position, the sun screen 40 is found entirely above the helmet 5. This length of rail 10 must therefore be at least the sum of the height of this sunscreen 40 and the spacing between the fastener 25 and the carriage 20, ie a length between 8 and 16 centimeters. The carriage has at least a length of 1 cm, preferably between 1.5 and 3 cm, to be sufficiently rigid and to prevent any lateral movement of the sun screen 40.

The carriage 20 being dimensioned to slide freely along the rail 10, it is provided with a position locking device comprising a lever mounted in rotation in a female knuckle 28. The lower branch of this link constitutes a cam 30 housed in a central opening 26 of the carriage 20; the upper branch of this lever constitutes a gripping rod 32. As illustrated, if the rod 32 is pushed forward, the cam 30 is raised in the central opening 26 and the carriage 20 is free to slide. Conversely, if the rod 32 is lowered against the carriage, the cam 30 bears in wedge against the central strip 12 of the rail 10.

In Figures 2 and 2a is illustrated a second embodiment of the screen fixing device 40 in which the rail 60 is in the form of a thick plastic strip with a median longitudinal opening (or slot) crossing the thickness. The width of the opening is of the order of 2 and 5 millimeters, and the thickness of the strip can be between 1 and 3 millimeters. This strip is glued against the front face of the helmet 5 by two strips of adhesive 68 bordering the opening, this adhesive being either permanent or temporary, such as a strip sold under the name "VELCRO". The upper rear end of the opening separates in Y to form a retractable stop 66, this part of the strip not being glued to remain flexible.

The associated carriage 70 is formed of a parallelepipedal central body 74 of width equal to that of the opening of the rail 60, and of sufficient length to ensure good longitudinal guidance, for example, greater than 10 millimeters. This body is clamped in the opening of the rail by a lower tab 76 and an upper gripping button 72 wider than the opening. In other words, the carriage 70 has two lateral grooves at the level of the central body, these grooves being engaged in the lateral edges of the opening.

In the example illustrated, the middle part of the upper edge of the screen 40 is directly rigidly fixed in the gripping button 72 of the carriage, for example, by means of screws.

The height of the body 74, therefore of the lateral grooves of the carriage, is very slightly less than the thickness of the strip of the rail 10 so that the friction of the tongue and of the button against the strip creates a predetermined force sufficient to permanently maintain the last position of the carriage and the screen, while allowing the assembly to slide by simply pulling on the striated top of the button.

If, on the other hand, the free upper end of the rail 10 is raised, the upper edge of the Y-shaped opening 66 is lowered, which enables the carriage 70 to be taken out of the rail 10 for screen change or repair. This manipulation is easy, making this device particularly suitable for general public use. In particular, this device simply attached by gluing can be sold separately to equip pre-existing helmets.

In FIG. 3 is illustrated a half-helmet 105 intended to be fitted against the front face of a helmet and held by a plurality of fastening snaps 107. The combination of this half-helmet 105 and the front face of the helmet forms an internal housing for storing a sunscreen 40. For this, according to a variant of the first embodiment, an arched rail 110 is reported on the internal face of the half-helmet 105, rail on which a carriage 120 can slide with the gripping rod 132 of the locking device emerging from a longitudinal opening 111 formed parallel to the middle of the rail 110. As before, the fastener 125 of the sun screen 40 is held by two lateral arched suspension arms 124. This embodiment is particularly elegant in that only the gripping rod 132 appears outside the longitudinal opening 111 when the screen 40 is completely stored under the half-helmet 105.

In Figures 4 and 4a is illustrated a so-called "internal" variant of the second embodiment of Figure 2, and in which the rail 112 consists of a longitudinal opening formed directly in the upper shell of the helmet 5. The foam 6 lining the underside of the shell is also reshaped, for example, using a heating tool, to create an underlying duct of rectangular cross section. The rear upper end of the opening has a transverse widening 114 in T for introduction or removal of a carriage 122. This carriage has a structure similar to that of FIG. 2, namely a central body 128 furnished with a tongue lower 129 and an upper gripping button 126 thus forming two lateral grooves engaged in the lateral edges of the opening 112.

However, and as well illustrated in FIGS. 4, the screen 40 is attached here to the carriage by an extension arm 123 in the form of a single strip of plastic with a thickness of the order of 2 to 5 millimeters, and width between 15 and 25 millimeters. The conduit shaped in the foam under the opening 114 preferably has a width equal to that of the arm, and a height equal to the sum of that of the arm 123 and the tongue 129, thus forming an additional guide conduit. In this example, the lower end of the arm 123 is secured, by gluing or screwing, to the middle part of the upper edge of the screen, and the upper end has a beveled housing 121 through which the central body 128 of the carriage passes.

As can be seen, the presence of this extension arm makes it possible to return the rail 112 on the top of the helmet further back, the length of this rail remaining substantially equal to the sum of the height of the screen and the normal gap between the eyebrows and the lower edge of the helmet. The front part of the helmet then remains available for any other accessory such as visor, decoration or the like, the remote location of the button 126 giving a feeling of "remote control". In particular, once lowered, the screen appears held at the end of a strip central giving a particular aesthetic effect arousing the reminiscence of old feudal helmets.

When the carriage 122 is pulled at the level of the clearance 144, it is then possible to lift the button 126 from the rear. The central body 126 then begins to come out of the clearance 144, the width of which is greater than that of the lower tab 129. The bevelled front and rear faces of the housing 121 of the arm 123 then facilitate the release of this lower tab. Once the cart is fully extended, you can then extract the screen with its extension arm from the front of the helmet for exchange.

In FIG. 5 is illustrated a third inverted embodiment of the device insofar as the rail is here fixed to the screen, the upper edge of which it extends, and the carriage 145 sliding along the rail is here integral with the helmet 5. In this case, the rail is a plastic strip with a thickness of the order of 3 to 6 millimeters and a width of between 2 and 4 centimeters; and the carriage 145 consists of two openings obliquely passing through the thickness of the upper shell, openings arranged parallel opposite. More precisely and as seen from the front to the rear, the lower opening 146 has an oblique ramp upwards while the upper opening 147 has an oblique ramp downwards.

By then passing the rail from the inside to the outside at the lower opening 146, then from the outside to the inside at the upper opening 147, a screen is obtained located under the helmet in storage position, only a portion of the rail remaining visible between the two openings. Preferably, the upper face of the rail 142 is provided with ridges in order to be able to act on it as on a wheel to bring the screen down as desired. The cross section and the quality of surfaces of the openings 146 and 147 are adjusted according to the same characteristics of the rail to obtain a sufficient friction force keeping the screen in its last position, but allowing displacement by simple action on the visible notches of the rail.

In FIG. 6 is illustrated the adaptation of a sunscreen 140 against the internal face of a windshield screen 154 of an integral motorcycle helmet 150, which windshield 154 is normally movable in rotation around axes 152 located at the wearer's temples. In this example, a vertical rail 160 is attached in the middle against the lower half of the internal face of the windshield 154. A carriage 170 fixed to the lower edge of a sunscreen 160 slides in friction along this rail 160. A grip button 182 of the carriage emerges outwards from a vertical slot. Preferably, the thicknesses of the rails 160 and of the carriage 170 are minimized as much as possible.

As an alternative, this rail 160 can also be summed up as a vertical longitudinal opening made through the windshield screen 154, the carriage 170 then comprising, on each side, a groove engaged in the thickness of this opening. The grip button 182 is then obviously accessible outside the windscreen 154. If necessary, the carriage 170 is then completed downwards with a tongue or an elastic veil or a foldable fabric closing the opening / rail 160 when the sun screen 140 is in the upper position. A biker can thus have a full-face helmet usable both at night and on sunny days.

In Figures 7, 7a and 7b is illustrated another embodiment of the invention more particularly intended to be fixed to a headband 200. As before, the device for fixing a sun screen 205 comprises a first rail arc 210 in which an internal carriage 221 runs. This rail 210 is in the form of an elongated rectangular frame having a longitudinal opening 214. The upper and lower edges of this frame constitute stops. The lateral edges of the longitudinal opening are oblique chamfered towards the headband.

This arched rail 210 is fixed to the headband 200 by means of an anterior blade 240 fixed at its lower end by a hinge 242 and retained at its upper end by a hook 244.

More particularly in this embodiment, the carriage 221 is not extended by suspension arms, but by a second rail 220 also being in the form of a frame having a longitudinal opening 224 whose edges are chamfered oblique towards the headband. To maintain correct alignment between these two rails 210 and 220, the first rail is completed with a pair of lateral guide flanges 212.

FIG. 7a illustrates in cross section the connection of the carriage 221 to the first rail 210. For this, the rear face of the carriage 221 is provided with two hooks 226 which can be momentarily brought close to each other for insertion into the longitudinal opening 214. Once installed, a locking pin 228 is placed between the hooks 226 thus finalizing a dovetail assembly. The width of the locking pin 228 spreading more or less the hooks 226 makes it possible to adjust the friction forces of the sliding of the carriage 221 along the rail 210.

Similarly, FIG. 7b illustrates, in cross section, the fixing of the sun screen 205 in the second rail 220. For this, a trapezoidal fastener 230 is fixed against the rear face of the sun screen 205 when the latter is pressed against the rail 220 by means of one or more pins or rivets 234. This trapezoidal fastener constitutes, with the rail 220, a dovetail assembly whose friction forces are adjusted by the dimensions of this fastener 230, including its angle at the top. Advantageously, the pins or rivets 234 are used to fix a gripping button 232 on the external face of the sun screen 205. As best visible in this FIG. 6, the displacement of this fastener 230 along the second rail 220 n '' does not interfere with the movement of this second rail in the first 210.

The length of the rails 210 and 220 is substantially identical, the length of the first rail must be at least greater than the height of the strip 220, the length of the second rail must allow the upper edge of the sunscreen to be brought at least to the level wearer's eyebrows.

As we have seen from reading this presentation and examining the drawings, the shape of the component parts of the fastening devices allows them to be produced by injecting thermoplastic material into one or more molds, which makes it possible to reduce as much the realization costs.

If desired, the devices described above can be supplemented by means of remote control of the movement of the carriage along the rail. For example, in the device according to FIG. 1, a spring is installed between the rear stop 16 and the fastener 25 or the carriage 20, this spring operating in compression to fold down, at rest, the screen before the eyes. The mouth of a sheath containing a sliding cable is fixed at the stop 16, while the end of this cable is fixed either to the fastener 25 or to the carriage 20. Thus, by pulling on the cable to the other end of the sheath, the screen 40 can be pulled up against the effect of the spring. This pulling can be carried out by a trigger held in the hand by the carrier. As an alternative, the cable is replaced by a nylon thread wound on a drum driven by an electric motor powered by batteries, and located slightly above and below the rail. The electric motor can then be controlled remotely by radio or infrared remote control. The electric motor can also be mounted on the carriage to drive a friction wheel acting against the rail, or drive a toothed wheel engaged in a rack shaped in the rail.

Many improvements can be made to this fixing device within the scope of the claims.

Claims

1. Device for attaching a sight protection screen (40), or a pair of glasses, to a headgear without visor (5) or to a headband allowing the displacement of the screen or glasses from a stored position to a use position, this device comprising a single central rail (10) fixed or arranged in the middle on / in / under the front face of the headgear (5) or of the headband, or of the front face of an internal housing for the screen or the glasses attached to the front of the headgear or the headband, characterized in that a carriage (20) attached to the rail is movable only when sliding , and in that the screen or the glasses (40) are rigidly attached to the carriage in the plane of the rail; or conversely, the end of the rail being rigidly fixed in the middle of the upper edge of the screen or glasses, and the carriage being attached or arranged in the middle of the headgear or headband.

2. Device according to claim 1, characterized in that the screen, or the glasses (40) are attached to the carriage (20) by one or more extension arms (24) parallel to the rail (10) and arcuate according to a same curvature as this rail.

3. Device according to claim 1 or 2, characterized in that the carriage (20) is provided with a button or a gripping rod (32) allowing to act directly on this carriage to move it along the rail (10), and in that, when the carriage (120) moves on a rail (110) situated under the front face (105) of an internal housing, this gripping rod (132) of the carriage (120) emerges out of a longitudinal opening (111) of the face (105) and formed parallel to the middle or to the side of the rail (110).

4. Device according to one of claims 1, 2 or 3, characterized in that the rail (10) comprises in its lower part a stopper (14) preventing the fall of the screen (40) or glasses ; and in its upper part a surmountable stop (16) by which the carriage (20) can be disengaged for exchange of the screen (40) or glasses.

5. Device according to one of claims 1 to 4, characterized in that the rail (10) is in the form of two guides connected by a central strip (12) fixed against the front face, in that the carriage ( 20) comprises a rectangular plate whose curved longitudinal edges are clipped to the guides, this carriage being dimensioned so that it can slide freely along the rail, and in that the carriage (20) is provided with a locking device comprising a lever mounted in rotation (28), the internal branch of which is a cam (30) capable of jamming against the rail (10) or against the face of the helmet (5), and the other branch of which constitutes a gripping rod (32).

6. Device according to one of claims 1 to 4, characterized in that the rail is in the form of a longitudinal opening (112) in the front face or (60) in a strip fixed against the front face with a certain spacing (68), and in that the carriage (70,122) is in the form of a longitudinal median body (74,128) of width identical to the opening where it is held by a lower tongue (76,129) and a upper grip button (72,126) wider than the opening, the screen (40) or the extension arm (123) being either integral with the tongue or button, or clamped between the tongue and the front face or between the button and the front face, the height of the body (74,128) being dimensioned as a function of the thickness of the opening (60,112), and possibly of the thickness of the screen or of the extension arm crossed, such so that the attachment of the carriage to the rail generates pred friction forces Completed to move and then hold it in any position along the rail.

7. Device according to claim 6, characterized in that the surmountable aπière stop is a transverse opening in Y (66) or in T (114) of width greater than that of the lower tongue (76,129) of the carriage, transverse opening whose rear edge is flexible for lowering, when desired, below the tongue.

8. Device according to claim 1 or 4, characterized in that the end of the rail (142) is rigidly fixed in the middle of the upper edge of the screen or glasses

(40), and the carriage (145) integral with the helmet (5) is in the form of a tube of identical section to the rail fixed to the outside or inside of the front face; or in the form of two successive openings (146,147), of identical cross-section to the rail, formed in the front face, and in which the rail (142) passes from the inside of the front face towards the outside, then back towards inside, or vice versa.

9. Device according to claim 1, characterized in that the sight protection screen (205), or the pair of glasses is slidably connected to a second rail (220) secured to a carriage (221) sliding him - even along the first central rail (210), these connections being preferably made by a dovetail assembly.

10. Device according to claim 7, characterized in that the fixing of the first rail (210) to the headband (200) comprises a blade (240) rear intended to pass behind the headband, this blade being connected in a first end by a hinge (242) at one end of the first rail, and being provided at its other end with a hook (244) coming over the other end in correspondence of the first rail.