EP4098370A1 - Device for protecting a liquid jet - Google Patents

Abstract

A device for protecting (2) a jet of liquid emitted by a pressurized liquid spraying device comprises an adapter (21), a protective bell (23) and a device for assembling the protective bell to the 'adapter. The device for assembling the protection bell to the adapter comprises a first assembly portion (211c and/or 212c, 24) and a second assembly portion (231). The adapter comprises an upper jaw (211) and a lower jaw (212) of a jaw, a removable clamping device ((211e) and/or (212e), 24) and the first assembly portion is formed at the least partly on at least one of the upper jaw (211c) and the lower jaw (212c). The liquid jet protection bell (23) comprises a flange (231) and the second assembly portion (232). The device for assembling the protective cover to the adapter can assume a locked position and an unlocked position in which the first portion and the second assembly portion are free with respect to each other. tightening of the upper and lower jaws is configured to, when tightened, cause the passage of the device for assembling the protection bell to the adapter from the unlocked position to the locked position.

Description

FIELD OF THE INVENTION

The present invention relates to an apparatus for spraying a liquid, and more generally a fluid, such as a paint onto a surface to be covered.

More specifically, the invention relates to a device for protecting the jet of liquid at the outlet of an apparatus for spraying liquid under pressure without air (“ ^airless® ”).

TECHNOLOGICAL BACKGROUND

In the field of construction, it is known to use mechanized devices for applying liquid paints, in particular by pneumatic spraying or by airless spraying (“airless® ^” ), with the aim of improving the speed and/or the efficiency of material transfer to the surface to be painted, and/or to improve the quality of the finish.

Airless spraying uses a high pressure fluid supply (up to 200 bar, even 500 bar), without mixing with compressed air, the fluid pressure being high. At the outlet of the spray nozzle, the friction between the jet of fluid and the atmosphere disperses the jet into small particles, thus allowing the atomization of the fluid. Tip size and pressure determine product flow. The jet profile depends on the pressure of the fluid, so the latter must not be too low. Furthermore, the higher the viscosity of the product, the higher the pressure must also be high. Thus, an airless spray gun typically includes a nozzle holder and nozzle that can be changed to suit the properties of the fluid and the expected spray, and also includes a trigger to actuate the spray.

Airless spraying is used in particular for the application of medium to high viscosity fluids such as dyes, lacquers and varnishes, or thicker liquids, such as latex house paint.

This technique has the advantage of allowing high speed of application and good transfer efficiency, combined with quality rendering.

To obtain the most uniform possible application of the paint, the nozzle of the spraying device is directed towards the surface to be coated and moved parallel to this surface, without contact with the latter. Typically, the nozzle outlet is placed approximately 10cm to 50cm from the surface to be coated.

In cases where the application takes place outdoors, for example during restoration operations, the paint jet can be deviated from the desired direction by disturbing elements over this distance of 10 to 50 cm to be covered between the nozzle outlet and the surface to be coated. In particular, in case of wind, the quality of the application is reduced, because it becomes inhomogeneous. The jet can also be deflected towards the operator or other people or objects, vehicles, carpentry, dwellings, etc., located nearby.

It is known to add devices for protecting the jet of liquid against the wind.

Thus, the document KR2013/0125343 describes a device for protecting the jet of paint coming out of a spray gun of the “ ^airless® ” type. The protective device is intended to be mounted on the nozzle holder by means of a clamping ring, itself tightened by means of a screw on the spray gun. It comprises a flexible sheet (vinyl, fabric, mesh), stiffened by a helicoidal elastic structure, so that it forms a truncated cone. An opening is provided on the sheet to allow the nozzle to pass.

• soit de dévisser le porte-buse si la feuille souple n'est pas suffisamment extensible pour que le diamètre de l'ouverture circulaire à placer sur le pistolet s'accroisse suffisamment pour être glissé par-dessus la protection de buse rigide du porte-buse,
• soit d'utiliser une feuille formée dans un matériau extensible ou très souple, ce qui rendra sa manipulation inconfortable et entraînera des risques de déchirure, notamment lors des opérations de nettoyage sous un jet d'eau ou au moyen d'un couteau de peintre.

However, the implementation of this device requires:

• either to unscrew the nozzle holder if the flexible sheet is not sufficiently extensible so that the diameter of the circular opening to be placed on the gun increases sufficiently to be slid over the rigid nozzle protection of the nozzle holder ,
• or to use a sheet formed from an extensible or very flexible material, which will make it uncomfortable to handle and will entail risks of tearing, in particular during cleaning operations under a jet of water or by means of a painter's knife.

The invention thus aims to propose a device for protecting the "universal" liquid jet, that is to say which can be adapted to a wide range of nozzle holders intended to equip a spray gun, in a removable manner and without screwing or unscrewing a part of the gun, while being if possible resistant and easy to clean.

SUMMARY OF THE INVENTION

• le dispositif d'assemblage de la cloche de protection à l'adaptateur comprend une première portion d'assemblage et une seconde portion d'assemblage,
• l'adaptateur comporte :
  • un mors supérieur et un mors inférieur d'une mâchoire destinée à enserrer une portion du dispositif de pulvérisation dont l'axe d'émission du jet est disposé suivant le premier axe,
  • un dispositif amovible de serrage des mors supérieur et inférieur suivant un deuxième axe orthogonal au premier axe de sorte que les mors supérieur et inférieur peuvent être soit séparés l'un de l'autre, soit attachés l'un à l'autre avec un écartement variable entre un écartement minimal et un écartement maximal suivant le deuxième axe, dit de serrage,
  • la première portion d'assemblage du dispositif d'assemblage de la cloche de protection à l'adaptateur, formée au moins en partie sur au moins l'un du mors supérieur et du mors inférieur
• la cloche de protection du jet de liquide comporte:
  • une collerette tubulaire ou tronconique d'axe le premier axe
  • la seconde portion d'assemblage du dispositif d'assemblage de la cloche de protection à l'adaptateur,
• le dispositif d'assemblage de la cloche de protection à l'adaptateur peut prendre deux positions :
  • une position verrouillée dans laquelle la première portion d'assemblage est fixe par rapport à la deuxième portion d'assemblage au moins en translation par rapport au premier axe de sorte que, lorsque le mors supérieur et le mors inférieur sont attachés l'un à l'autre, la cloche de protection est fixe par rapport à l'adaptateur au moins en translation par rapport au premier axe,
  • une position déverrouillée dans laquelle la première portion et la deuxième portion d'assemblage sont libres l'une par rapport à l'autre,

le dispositif de serrage des mors supérieur et inférieur étant configuré pour, lorsqu'on le serre, provoquer le passage du dispositif d'assemblage de la cloche de protection à l'adaptateur de la position déverrouillée à la position verrouillée.Thus, the invention relates to a device for protecting a jet of liquid emitted by a pressurized liquid spraying device. The protective device extends along a first axis intended to be identical to an axis of emission of the jet of liquid and comprises an adapter, a protective bell and a device for assembling the protective bell to the adapter such that :

• the device for assembling the protective cover to the adapter comprises a first assembly portion and a second assembly portion,
• the adapter includes:
  • an upper jaw and a lower jaw of a jaw intended to grip a portion of the spray device, the jet emission axis of which is arranged along the first axis,
  • a removable device for clamping the upper and lower jaws along a second axis orthogonal to the first axis so that the upper and lower jaws can be either separated from each other or attached to each other with a gap variable between a minimum spacing and a maximum spacing along the second axis, called tightening,
  • the first assembly portion of the device for assembling the protection bell to the adapter, formed at least in part on at least one of the upper jaw and the lower jaw
• the liquid jet protection bell includes:
  • a tubular or tapered flange with an axis the first axis
  • the second assembly portion of the device for assembling the protection bell to the adapter,
• the device for assembling the protective cover to the adapter can take two positions:
  • a locked position in which the first assembly portion is fixed relative to the second assembly portion at least in translation relative to the first axis so that, when the upper jaw and the lower jaw are attached to one on the other, the protective bell is fixed relative to the adapter at least in translation relative to the first axis,
  • an unlocked position in which the first portion and the second assembly portion are free relative to each other,

the device for clamping the upper and lower jaws being configured to, when tightened, cause the passage of the device for assembling the protection bell to the adapter from the unlocked position to the locked position.

Thanks to these provisions, it is possible to removably mount the liquid jet protection device on a spray gun. The implementation of both a device for clamping the upper and lower jaws and a device for assembling the protective cover to the adapter, a portion of which is formed on at least one of the jaws under the shape allows the protective device to be adapted to a wide range of spray devices.

The device for assembling the protective cover to the adapter also makes it possible, if necessary, to change only the protective cover (and possibly its shape and size).

Furthermore, the locking of the device for assembling the protection bell to the adapter makes it possible to limit the degrees of freedom of movement of the collar relative to the spray gun. This allows the operator to work comfortably.

Finally, the cooperation between the device for clamping the lower and upper jaws and the device for assembling the protection bell to the adapter allows a simple installation of the device, so that the assembly and disassembly of the device by the operator are simplified.

According to one embodiment of the device for protecting against a jet of liquid, the removable clamping device is itself formed of two so-called left and right extensions which are symmetrical to one another with respect to the clamping axis.

This arrangement makes it possible to distribute the bending forces exerted on the adapter due to the clamping along the width, and to better control the positioning of this adapter relative to the spray gun.

The production of a part of the removable clamping device in the form of an extension facilitates the handling of this clamping device and therefore the installation or removal of the protection device by an operator.

This arrangement also makes it possible to give a certain latitude for adjusting the device to various dimensions of spray guns.

According to one embodiment of the device for protecting against a jet of liquid, a male portion and a female portion are defined from among the first portion of the device for assembling the protection bell to the adapter and the second portion of the device for assembly of the protection bell to the adapter. The male portion consists of at least two disjoint protruding elements, the female portion consists of at least two disjoint hollow elements, and the male and female portions cooperate by their shapes for the assembly of the first and the second portion. Each jaw comprises at least one of the separate elements constituting the first portion of the device for assembling the protective bell to the adapter, and the device for assembling the protective bell to the adapter is locked at least when the gap between the two jaws is minimal.

Thanks to this arrangement, it is possible to assemble the bell to the adapter when the jaws are not completely tightened and to cause the passage of the device for assembling the protective bell to the adapter of the protective bell the adapter by tightening the jaws. The protective device can thus be adapted to different types of spray guns.

According to one embodiment of the liquid jet protection device, the at least two separate elements of the female portion form a symmetrical assembly with respect to the clamping axis and/or with respect to an axis orthogonal to the first axis and to the clamping axis.

Thanks to this arrangement, the device for assembling the protective cover to the adapter has common elements of symmetry with the spray gun on which it must be adapted.

According to one embodiment of the device for protecting a jet of liquid, the collar is rigid.

In this way, the collar resists any shocks that it may undergo during handling and/or between two handling operations.

According to one embodiment of the device for protecting a jet of liquid, the collar comprises a recess making it possible to manipulate a nozzle of the spray gun.

Thanks to this arrangement, the operator does not need to disassemble the protective device to clean or change the nozzle, or even to adjust the jet of liquid.

According to one embodiment of the liquid jet protection device, the latter can be mounted on the pressurized liquid device without dismantling one or more elements of the pressurized liquid device.

Thanks to this arrangement, the manipulations on the spray gun are reduced, and therefore the manipulation time for the operator is reduced, as well as the risks of breakage or premature wear of some of its parts, such as the door -nozzle or nozzle.

According to one embodiment, the device for protecting a jet of liquid is adapted to be mounted on a pressurized liquid spraying device comprising a nozzle and a nozzle adjustment lever without dismantling the nozzle and/or for allow manipulation of the nozzle adjustment lever and/or replacement of the nozzle when the protection device is mounted on the spray device.

Thanks to these provisions, a spraying device comprising a nozzle can be equipped with the protection device while leaving the possibility for the operator to adjust the flow rate of the nozzle or to replace this nozzle without complicating this replacement. An operator will therefore adopt the protection device more easily than the protection devices of the prior art which would add handling steps to carry out these operations.

According to one embodiment of the device for protecting against a jet of liquid, the device for assembling the protective cover to the adapter comprises a device for adjusting the relative positions of the protective cover to the adapter according to the first axis.

Thanks to this arrangement, it is possible to position the protection device more or less close to the orifice of the nozzle and therefore to adapt its position to the type of spray gun and/or to the shape of the jet of liquid.

According to one embodiment of the device for protecting a jet of liquid, the adjustment of the relative positions of the protection bell and of the adapter along the first axis makes it possible to provide a space for access to a nozzle of the spraying device of pressurized liquid and/or to mount the protective device on pressurized liquid spraying devices of different characteristic dimensions along the first axis.

This arrangement makes it possible to adapt the protective device to spraying devices whose nozzles have different dimensions along the first axis.

The invention also relates to a spraying assembly which comprises a spraying device and at least one protection device as presented above. The spray device comprises a base and a removable part, the removable part being removably assembled on the base and changed for example according to the nature of the liquid to be sprayed and/or the expected result. The removable part comprises in particular a nozzle and a nozzle holder. The jaw formed by the upper jaw and the lower jaw can then enclose at least a portion of the nozzle holder, and preferably exclusively a portion of the nozzle holder. This arrangement makes it possible in particular to limit the problems of interference between the protection device and the various component elements of the spray device, and in particular the components of the base of the gun, but also the nozzle.

1. a. de mise en place des mors supérieur et inférieur, dans laquelle les mors supérieur et inférieur de l'adaptateur, initialement totalement séparés, sont placés de part et d'autre d'un pistolet de pulvérisation, de manière à former une mâchoire enserrant le pistolet de pulvérisation et de manière à ce que les mors supérieur et inférieur soient placés de part et d'autre d'un plan horizontal contenant l'axe du jet ;
2. b. de mise en place du dispositif de serrage, dans laquelle le dispositif de serrage des mors supérieur et inférieur est mis en place et serré partiellement, de manière à ce que les mors supérieur et inférieur soient attachés l'un à l'autre avec jeu et de sorte qu'ils ne nécessitent pas d'être maintenus par un opérateur pour rester autour du porte-buse ;
3. c. d'assemblage, dans laquelle la première portion et la seconde portion du dispositif d'assemblage de la cloche de protection à l'adaptateur sont assemblées ;
4. d. de serrage, dans laquelle on serre le dispositif de serrage des mors supérieur et inférieur jusqu'à ce que le pistolet de pulvérisation soit encastré dans la mâchoire, cette étape de serrage provoquant le passage du dispositif d'assemblage de la cloche de protection à l'adaptateur de la position déverrouillée à la position verrouillée.

The invention also relates to a method for assembling a device for protecting a jet of liquid to a device for spraying liquid under pressure, the protection device extending along a first axis intended to be identical to a axis of emission of the jet of liquid and comprising an adapter, a protective bell and a device for assembling the protective bell to the adapter. The assembly process includes the following steps:

1. has. upper and lower jaw fitting, in which the upper and lower jaws of the adapter, initially completely separated, are placed on either side of a spray gun, so as to form a jaw gripping the gun spray and so that the upper and lower jaws are placed on either side of a horizontal plane containing the axis of the jet;
2. b. of the clamping device, in which the clamping device of the upper and lower jaws is placed and partially tightened, so that the upper and lower jaws are attached to each other with clearance and so that they do not need to be held by an operator to stay around the nozzle holder;
3. vs. assembly, in which the first portion and the second portion of the device for assembling the protection bell to the adapter are assembled;
4. d. clamping device, in which the clamping device of the upper and lower jaws is clamped until the spray gun is embedded in the jaw, this clamping step causing the assembly device to pass from the protective bell to the adapter from the unlocked position to the locked position.

1. 1. on fournit un dispositif d'assemblage de la cloche de protection à l'adaptateur comprenant un dispositif de réglage des positions relatives de la cloche de protection et de l'adaptateur suivant le premier axe ;
2. 2. on règle les positions relatives de la cloche de protection et de l'adaptateur suivant le premier axe.

According to one embodiment of the assembly method, this method further comprises the steps:

1. 1. a device for assembling the protective cover to the adapter is provided, comprising a device for adjusting the relative positions of the protective cover and of the adapter along the first axis;
2. 2. the relative positions of the protection bell and of the adapter are adjusted along the first axis.

BRIEF DESCRIPTION OF DRAWINGS

• [Fig. 1] représente une vue de côté d'un pistolet de pulvérisation muni d'un dispositif de protection du jet de liquide.
• [Fig. 2] représente une vue de face de l'adaptateur du dispositif de protection du jet de liquide prêt à être monté sur un pistolet de pulvérisation dont le jet a pour axe un axe (Oz) perpendiculaire au plan (xOy) du schéma.
• [Fig. 3] représente une vue de face du dispositif de protection du jet de liquide monté sur un pistolet de pulvérisation dont le jet a pour axe un axe (Oz) perpendiculaire au plan (xOy) du schéma.
• [Fig. 4] représente une vue arrière d'un mode de réalisation de la cloche de protection.
• [Fig.5] représente une vue de face de l'adaptateur du dispositif de protection du jet de liquide monté sur un pistolet de pulvérisation de diamètre supérieur au diamètre minimal accepté.
• [Fig.6] représente une vue de dessus du mors supérieur du dispositif de protection du jet de liquide.

Embodiments of the invention will be described below with reference to the drawings, briefly described below:

• [ Fig. 1 ] shows a side view of a spray gun fitted with a liquid jet protection device.
• [ Fig. 2 ] shows a front view of the adapter of the liquid jet protection device ready to be mounted on a spray gun whose jet axis has an axis (Oz) perpendicular to the plane (xOy) of the diagram.
• [ Fig. 3 ] shows a front view of the liquid jet protection device mounted on a spray gun, the jet of which has as its axis an axis (Oz) perpendicular to the plane (xOy) of the diagram.
• [ Fig. 4 ] shows a rear view of one embodiment of the protective bell.
• [ Fig.5 ] shows a front view of the liquid jet protection device adapter mounted on a spray gun with a diameter greater than the minimum accepted diameter.
• [ Fig.6 ] shows a top view of the upper jaw of the liquid jet protection device.

In the drawings, identical references designate identical or similar objects.

DETAILED DESCRIPTION

The invention relates to a device 2 for protecting the jet of liquid emitted by a device 1 for spraying a liquid material on a surface under high pressure and without the addition of compressed air, as well as a method for assembling the device for liquid jet protection to a spray device.

By way of example, the spraying device is of the Graco ^® or Wagner ^® brand.

The liquid material to be sprayed is in particular a wall paint in aqueous or organic phase, a lacquer, a varnish, or even a thicker or viscous liquid, such as a liquid used for coating exterior walls.

The spraying device comprises a suction pump connected by a hose to a spray gun 1. This spray gun 1, represented on the figure 1 , comprises, on a so-called upper side of the gun, a nozzle, optionally comprising a handle 11b, a nozzle holder 12, optionally comprising at its end a nozzle protection 122 and from which the handle 11b emerges, and on one side said bottom of the gun, a handle 13 and a trigger 14 possibly provided with a protection 15. The handle 13, the trigger 14 and if necessary the protection 15 are mounted on a frame 16 which comprises a device 17 for fluidic connection with for example a supply pipe (not shown) of the material to be sprayed, and form a first so-called base part. The trigger 14 is positioned opposite and close to the handle 13, so that an operator holding the gun by the handle 13 with one hand can actuate the trigger 14 with the same hand. The nozzle 11 and the nozzle holder 12 form a second part, said to be removable with respect to the base. Indeed, the nozzle 11 and the nozzle holder 12 are reported on the base and can be changed for example according to the properties of the projected fluid and/or the expected result. The removable assembly between the base and the removable part can be made by any known means.

The liquid jet is flat or conical. In both cases, it has a main axis of symmetry, coinciding with an axis of symmetry of the opening of the nozzle, which will be called “axis of the jet” in what follows.

In the figures showing front and side views of the spray gun 1, the axis of the jet is a horizontal axis. In the figures, the axis of the jet, that is to say the axis of the jet leaving the nozzle, is the axis (Oz), O being any point on the axis of the jet, for example the center of the nozzle orifice.

The liquid jet protection device 2 comprises an adapter 21 and a protection bell 23 each extending along a first axis.

In what follows, for the purposes of simplification, a first axis (Oz), substantially corresponding to the axis of the jet, is defined from an orthogonal reference (Oxyz), a second axis (Oy) perpendicular to the first axis ( Oz) and extending substantially along the main direction of extension of the handle 13, and a third axis (Ox) perpendicular to the first axis (Oz) and to the second axis (Oy).

The adapter 21 comprises two jaws 211 and 212 of a jaw intended to grip a portion of the spray gun 1, so that the direction of the first axis (Oz) is identical to the axis of the jet. More specifically, the adapter 21 is intended to enclose a portion of the removable part, and in this case a portion of the nozzle holder 12. Preferably, the adapter 21 is mounted exclusively on the nozzle holder 12, and not on a portion of the gun base 1.

When the protection device 2 is mounted on the spray gun 1, the two jaws of the jaw 211 and 212 of the adapter 21 can be substantially symmetrical to each other with respect to a median plane, this plane containing the axis of the jet. If the nozzle holder 12 of the spray gun 1 comprises a nozzle guard 122, then the middle plane is also a middle plane for the nozzle guard 122. For the sake of clarity, in the following, an upper jaw is defined 211 and a lower jaw 212, the upper jaw 211 being intended to be arranged on the spray gun on the upper side, that is to say on the same side of the median plane as that comprising the handle 11b of the nozzle 11.

According to one embodiment, the portion of the spray gun 1 intended to be clamped is of cylindrical shape. This is, for example, the nozzle holder 12.

The two upper 211 and lower 212 jaws, shown in front view on the figure 2 , form in this case a pipe clamp vise or equivalently a pipe clamp jaw.

It is however possible to adapt the device to portions of the protection device intended to be clamped of various sections, for example polygonal, simply by adapting the shape of the recesses of the jaws described below.

The two upper 211 and lower 212 jaws of the jaw are at least partially formed of a rigid material, such as a plastic material (PVC, etc.) or metal. Each of the upper 211 and lower 212 jaws comprises a central part (211a, 212a respectively) comprising a so-called main recess, for example in the form of a half-cylinder (211b, 212b respectively).

The main recess (211b, respectively 212b) of one or each of the upper 211 and lower 212 jaws can be covered with a flexible material such as rubber, polyurethane or polyethylene foam to limit the wear of the spray gun 1 by friction when it is gripped by the upper 211 and lower 212 jaws of the jaw. This arrangement also makes it possible to block the rotation around the axis of the jet of the spray gun 1 relative to the protective device 2, in particular in the case where the main recess of each of the upper 211 and lower 212 jaws is semi-cylindrical and where the portion of the spray gun 1, and more specifically the portion of the nozzle holder 12, enclosed by the upper 211 and lower 212 jaws is grooved or else has a polygonal section.

Optionally, the dimensions, and possibly the shape, of the main recess (211b, respectively 212b) of one or each of the upper 211 and lower 212 jaws can be modified temporarily or permanently by adding an insert of material flexible or rigid, for example neoprene in one and/or the other of the main recesses of the upper 211 and lower 212 jaws. The insert itself comprises a recess. Once the insert has been positioned in the main recess of a jaw (upper 211 or lower 212), the main recess of the assembly {jaw + insert} corresponds to the main recess of the insert and has dimensions , and possibly a shape, different from those of the main recess of the jaw alone.

This arrangement makes it possible in particular to increase the adaptability of the protection device 2 to various models of spray gun 1.

The two upper 211 and lower 212 jaws can either be completely separated from each other, in particular when the protection device 2 is not used, or attached to each other by means of a removable device clamping along a second axis orthogonal to the first axis, in particular when the protection device 2 is used, placed on the gun 1.

The device for clamping the upper 211 and lower 212 jaws makes it possible to attach the two jaws to each other with a variable spacing between a minimum spacing and a maximum spacing along the second so-called clamping axis.

When the two upper 211 and lower 212 jaws of the pipe clamp jaw are assembled by the clamping device and brought as close as possible to each other, they define an empty volume with axis the first axis in which the portion of the spray gun intended to be clamped, in this case the nozzle holder 12.

More specifically, the two upper 211 and lower 212 jaws define, for example, an empty volume of cylindrical shape, in which the nozzle holder 12 of a spray gun 1 can be inserted. More precisely still, this volume is for example formed by a cylinder with a directrix curve passing through the outline of the main recesses 211b, 212b of the jaws 211, 212 and with a generatrix a straight line substantially parallel to the first axis (Oz).

The shape of the contour of the main recesses 211b and 212b, whether they are semi-cylindrical or not, is chosen so as to be able to accommodate the nozzle holders 12 most commonly used in the construction industry.

At least a first part 211e of the device for clamping the upper jaws 211 and lower 212 is placed on the first jaw of one of the upper jaws 211 and lower 212 and at least a second part 212e of the device for clamping the upper jaws 211 and lower 212 is placed on the second of the upper 211 and lower 212 jaws.

• l'extension gauche du mors supérieur 211 (respectivement inférieur 212) forme la première (respectivement deuxième) partie du dispositif de serrage des mors supérieur 211 et inférieur 212 gauche.
• l'extension droite du mors supérieur 211 (respectivement inférieur 212) forme la première (respectivement deuxième) partie du dispositif de serrage des mors supérieur 211 et inférieur 212 droite.

According to one embodiment, the clamping device of the upper 211 and lower 212 jaws is itself formed of two clamping devices called left and right. For example, each of the upper 211 and lower 212 jaws comprises, on either side of the central part, in a second direction orthogonal to the first axis (for example the axis of the semi-cylindrical recess), known as the left-right direction, a first so-called left extension and a second so-called right extension, so that:

• the left extension of the upper jaw 211 (respectively lower 212) forms the first (respectively second) part of the clamping device of the upper 211 and lower 212 left jaws.
• the right extension of the upper jaw 211 (respectively lower 212) forms the first (respectively second) part of the clamping device of the upper 211 and lower 212 right jaws.

The left clamping device makes it possible to bring the left extension of the upper jaw 211 and the left extension of the lower jaw 212 closer to or away from each other in a direction, called the clamping direction, which is orthogonal. both to the axis of the jet and to the left-right direction.

The right clamping device makes it possible to bring the right extension of the upper jaw 211 and the right extension of the lower jaw 212 closer to or away from each other in the tightening direction.

In a particular embodiment, the left and right extensions 211e of the upper jaw 211 each comprise a tapped clamping recess 211f with an axis parallel to the clamping direction. In this case, the left and right extensions 212e of the lower jaw 212 also each comprise a threaded clamping recess 212f with an axis parallel to the clamping direction.

A first screw 22 for tightening the upper jaws 211 and lower 212 can be screwed both into the tapped recesses 211f for tightening the left extension of the upper jaw 211 and 212f of the left extension of the lower jaw 212 placed opposite the each other.

A second screw 22 for tightening the upper 211 and lower 212 jaws can be screwed both into the tapped recesses 211f for tightening the right extension of the jaw 211 and 212f of the right extension of the jaw 212 placed opposite one the other.

As a variant, the left and right extensions 211e of the upper jaw 211 can each include a tapped or untapped clamping recess 211f with an axis parallel to the clamping direction. The left and right extensions 212e of the lower jaw 212 also each comprise a tapped or untapped clamping recess 212f with an axis parallel to the clamping direction. As a further variant, only the clamping recesses of one of the two upper 211 and lower 212 jaws are threaded, the recesses of the other jaw not being threaded. Preferably, it is the clamping recesses 212f of the lower jaw 212 which are threaded, the clamping recesses 211f of the upper jaw 211 being devoid of threads.

A first clamping screw 22 can be inserted both in the tapped or unthreaded recesses 211f of the left extension of the upper jaw 211 and 212f of the left extension of the jaw 212 placed opposite one another.

A nut 22b can then be placed on the side opposite the head of the clamping screw 22, so that the two tapped or unthreaded recesses 211f of the left extension of the upper jaw 211 and 212f of the left extension of the lower jaw 212 are between the head of the clamping screw 22 and the nut 22b. The screwing of the clamping screw 22 in the nut 22b causes the approximation of the left extensions of the upper jaws 211 and lower 212.

The procedure is the same for the right extensions of the upper jaws 211 and lower jaws 212.

In this embodiment, the nut 22b can be in the form of a plug having a base, intended to come into contact with one of the extensions. The base of the nut 22b is preferably wide to facilitate tightening, in particular manual, to distribute the supports and to obtain the positioning of the two right extensions (respectively left) opposite each other during the last tightening step of this device described below. The nut is preferably placed on the side of the top jaw.

In particular, it will be seen that this arrangement is implemented for carrying out the fourth step of a method of assembling the protection device 2 which will be described later. This fourth step is a tightening step which causes the passage of the assembly device from the protective cover 23 to the adapter 21 in the locked position.

The clamping device therefore comprises in the example described above the left and right clamping devices and the clamping screws 22. It is removable thanks to the clamping screws 22 which can be completely unscrewed.

In the absence of the clamping screws 22, the two upper 211 and lower 212 jaws are independent of each other and can therefore be placed around a spray gun without the size limitations that would arise if these two upper 211 and lower 212 jaws were non-removably attached to each other.

As a variant, the clamping screws 22 can be fixed rigidly, removably using a tapping/threading system as presented above, or non-removably, for example by gluing or welding, on a first of the two jaws upper 211 and lower 212, and the second jaw is mounted on the clamping screws 22 so as to be able to adjust its distance with the first jaw as explained.

Furthermore, as soon as the screws 22 for clamping the upper 211 and lower 212 jaws connect these two jaws, it is understood that the spacing between these two jaws can be adjusted by screwing or unscrewing the two jaws.

This embodiment therefore allows great latitude in adapting the adapter to the spray device intended to be clamped.

This embodiment of the device for clamping the upper 211 and lower 212 jaws into two left and right clamping devices also makes it possible to obtain more durable clamping, for example than in the case of a central clamping device, during an operation. of spraying. Indeed, the spraying device working with high pressures, it is subjected to significant vibrations. The fact of distributing the tightening over two left and right devices limits the progressive loosening during spraying.

Furthermore, in the case where the clamping recesses 211f and/or 212f are not threaded, these recesses may have a characteristic dimension greater than the diameter of the shank of the screw 22 which must be inserted therein, so that the position of this rod is not totally constrained by the recess. This situation is represented on the figure 6 .

For example, the section of one or more of these recesses in a plane orthogonal to the direction of tightening can be of elongated shape, for example rectangular or oblong, of width slightly greater than the diameter of the shank of the screw 22 and of length along the axis of the greater jet (for example at least 1.1 times, or even twice greater) than the diameter of the shank of the screw. At least one of the upper 211 and lower 212 jaws comprises recesses 211f, 212f of elongated shape, for example the upper jaw 211. Thanks to this arrangement, when assembling the two upper 211 and lower 212 jaws by means of the clamping device, the upper jaws 211 and lower jaws 212 can partially swing relative to each other, which allows the adaptation of the protective device to a wide variety of spray guns 1 by means of the assembly method of a protection device described below.

In particular, this arrangement is implemented for carrying out the third step of the method of assembling the protection device, the third step during which the first portion and the second portion of the device for assembling the protective cover 23 to the adapter 21 are assembled.

The central part 211a (respectively 212a) of the upper jaw 211 (respectively lower 212) is for example in the shape of a rectangular U whose central branch comprises the main recess 211b (respectively 212b), for example semi-cylindrical. The plane (xOy) of the rectangular U is therefore orthogonal to the first axis, for example the axis (Oz) of the half-cylinder formed by each of the recesses 211b, 212b.

The central part 211a (respectively 212a) of the upper jaw 211 (respectively lower 212) extends in the left-right direction, but also in the tightening direction.

For example, the central part 211a (respectively 212a) of the upper jaw 211 (respectively 212) is in the shape of a rectangular U, the central branch of which has the left-right direction as its direction and the two lateral branches of which extend in the direction of tightening of the jaws.

In the case where the central parts of the upper 211 and lower 212 jaws have the shape of rectangular U, the height H of the central branch of the rectangular U of each of the upper 211 and lower 212 jaws can be chosen so as to be greater than the radius R of the main recess 211b (respectively 212b) if it is semi-cylindrical, or more generally greater than a characteristic height of the main recess 211b (respectively 212b) in general, but also to be low enough to allow the nozzle 11 to be rotated through any angle around its axis, identical to the second axis Oy when the device is installed.

In particular, the lever 11b of the nozzle 11 must be able to be positioned above the main branch of the rectangular U of one of the two upper 211 and lower 212 jaws, that is to say in the case of the picture 3 above the main branch of the rectangular U of the upper jaw 211. This arrangement allows the handling of the nozzle 11 even when the jet protection device 2 is mounted on the spray gun 1.

In other embodiments of the central parts 211a and 212 has upper 211 and lower 212 jaws, the central part of one of these jaws may not be in the shape of a rectangular U but a recess other than the main recess 211b (respectively 212b) may be provided so as to allow the rotation of the handle 11b of the nozzle 11.

In these embodiments, as will be explained below, the recess allowing the rotation of the lever 11b of the nozzle 11 can contribute to allowing sufficient air circulation for the equalization of the pressures between the interior of the bell protection 23 where the jet is formed, and the outside. This circulation of air contributes to the proper functioning of the spraying device.

The recesses of the central part 211a (respectively 212a) of a jaw other than the main recess 211b (respectively 212b) also make it possible to lighten the device of protection. Typically, an operator may be required to spray paint for several hours a day with a spraying device fitted with a protective device 2. It is therefore important to reduce the mass of the protective device 2 as much as possible. an order of magnitude, a protection device 2 according to the invention can have a mass of less than 500g, or even 400g.

Still for the purpose of lightening, the central parts 211a and 212a of the upper 211 and lower 212 jaws can be different from each other. For example, if these central parts are in the shape of a rectangular U, the height of the central branch of the rectangular U of the jaw intended to be placed below the protective device, for example the lower jaw 212, may be lower than that of the central branch of the rectangular U of the upper jaw 211 or lower 212 intended to be placed above the protective device, for example the upper jaw 211. This arrangement also makes it possible to facilitate the insertion of the lower jaw 212 between the holder nozzle 12 of a spray gun 1 and any trigger protection 15 of this gun.

The height of the central branch of the rectangular U of the upper jaw 211 will be chosen as low as possible but so that the upper jaw 211 can withstand the bending imposed by the presence of a spray gun 1 placed between the two jaws and clamped by them thanks to the tightening of the clamping device (211e and 212e) of the upper jaws 211 and lower 212.

In general, the dimensions of the central part of the upper jaw can be greater than those of the lower jaw. Indeed, the tightening of the clamping device (211e and 212e) of the upper jaws 211 and lower 212 being easier from the upper side towards the lower side when the operator holds the gun by the handle 13, it is the upper jaw which supports most of the bending imposed by the presence of the spray gun, as shown in the figure 5 .

The material constituting the central parts 211a (respectively 212a) of the upper jaw 211 (respectively lower 212) is moreover sufficiently rigid to ensure the maintenance of the protection device 2 fixed relative to the spray gun 1 which it equips, but sufficiently flexible so as to be able to deform elastically without breaking when the clamping device (211e and 212e) of the upper 211 and lower 212 jaws is tight enough to ensure this hold. This means under normal conditions of use, that is to say in the entire range of spray guns 1 on which the spray device 2 can be adapted.

The protective bell 23 includes a collar 231.

The protective collar 231 extending along a main direction identical to the first axis (Oz). The main direction of the protective collar 231 is therefore intended to be identical to the axis of the jet (Oz) when the protective bell 23 is installed on the spray device 1.

The protective collar 231 has a section of any shape along a plane perpendicular to this main direction. The section of the collar 231 in a plane perpendicular to the main direction has the shape of a circle or a polygon.

In the example shown on the figure 1 , the main direction is that of the first axis (Oz) and the collar 231 is tapered.

The size and/or the shape of the collar 231 can be adapted according in particular to the opening angle of the jet formed by the spray gun 1.

The flange 231 can be formed in a flexible or rigid material.

By rigid collar is meant here a collar which does not tear under normal conditions of use, for example under the effect of the pressure of the jet of liquid or during its installation or its cleaning. This does not exclude a capacity for elastic and/or temporary deformation.

A rigid material but having a certain elasticity has the advantage of making the device resistant to shocks, possibly frequent during spraying or even when an operator temporarily puts down the spray gun 1 equipped with the protective device 2.

For example, it is made of PVC, or even of any material suitable for 3D printing, such as polylactic acid (PLA). PLA has the advantage of being completely biodegradable.

A rigid material facilitates in particular the maintenance of the collar 231 between two sprayings and limits the risks of tearing or tearing under the pressure of the jet for example or during handling.

The thickness of the material constituting the collar 231 can be of the order of 1.5 mm or less.

The collar 231 can be manufactured using a 3D printer.

The protective bell 23 can be assembled to the adapter 21 by means of a device for assembling the protective bell to the adapter comprising a first assembly portion and a second assembly portion. The first assembly portion is formed at least in part on at least one of the jaws 211 and 212, and the second assembly portion 232 is formed on the protective bell 23.

The assembly device of the protective cover 23 to the adapter 21 is in a particular embodiment an assembly device by cooperation of shapes, comprising a male portion and a female portion.

The male portion and the female portion can be respectively the first portion and the second assembly portion or conversely the second portion and the first assembly portion.

To simplify, in the embodiments described below and for the figures, the male portion is the first assembly portion, formed at least in part on at least one of the upper 211 and lower 212 jaws and the female portion is the second assembly portion 232, formed on the protective bell 23. It is understood that this embodiment is not limiting.

The male portion of the assembly device by form cooperation can be formed by at least one protruding element 24. For example, the male portion of the assembly device by form cooperation comprises at least one assembly screw 24 of the bell protection 23 to the adapter 21. In this case, at least one of the upper 211 and lower 212 jaws comprises a threaded assembly recess 211c (respectively 212c) with an axis parallel to the first axis, that is to say the axis (Oz), in which can be screwed an assembly screw 24.

The male portion of the device for assembling the protection bell to the adapter, in this case the first portion of the assembly device, therefore comprises all the assembly screws 24 thus linked to one or more other of the upper jaws 211 and lower 212 and the threaded assembly recesses 211c and 212c of axis (Oz).

In one embodiment, the male portion of the device for assembling the protection bell to the adapter comprises a single projecting element 24, placed on one or the other of the jaws.

In a particular embodiment, the male portion of the device for assembling the protective cover to the adapter may be composed of a plurality of separate projecting elements 24, as can the female portion of the device for assembling the the protection bell to the adapter can be composed of a plurality of disjoint recesses 232a. The female portion thus comprises several recessed elements 232a.

For example, the male portion of the assembly device of the protection bell to the adapter comprises two assembly screws 24.

In this case, each of the upper 211 and lower 212 jaws can comprise at least one of the protruding elements 24 separate from the male portion of the device for assembling the protection bell to the adapter.

In this case, the upper jaw 211 comprises a threaded assembly recess 211c into which is screwed an assembly screw 24 and the lower jaw 212 comprises a threaded assembly recess 212c into which another assembly screw 24 is screwed. .

The threaded assembly recesses 211c and 212c can be placed on the second axis (Oy) corresponding to the tightening direction.

In one embodiment, the central parts 211a and 212a of the upper 211 and lower 212 jaws comprise all of the protruding elements 24 separate from the male portion of the device for assembling the protection bell to the adapter, and the portion assembly 232 comprises all of the recesses 232a separate from the female portion.

As a variant, the male portion of the assembly device of the protection bell to the adapter comprises four assembly screws 24. In this case, the central parts of the jaws can be in the shape of a rectangular U. The two lateral branches of the rectangular U of each of the jaws (upper 211, respectively lower 212) each comprise a threaded assembly recess (211c, respectively 212c) with an axis parallel to the first axis, that is to say the axis (Oz) of the jet, threaded assembly recess into which a screw can be screwed.

A screw 24 for assembling the protective bell 23 to the upper 211 and lower 212 jaws is screwed into each of the threaded assembly recesses with axis (Oz) 211c and 212c of the upper 211 and lower 212 jaws, so that that the heads of these screws 24 are placed towards the front of the adapter 21, that is to say on the side of the orifice of the nozzle 12 when the adapter 21 is mounted on the spray gun 1.

The length of the assembly screws 24 of the protective bell 23 to the jaws can be chosen so that the head of the assembly screws 24 protrudes from the adapter 21, for example by a few centimeters, as shown in figure 1 .

This embodiment of the male part in the form of one or more assembly screws 24 makes it possible to assemble the protection bell 23 to the adapter 21 by hanging the protection bell 23 on the head of the assembly screws 24 from the flange to the jaws, while leaving an adjustable empty space between the adapter 21 and the protective bell 23, in particular for the manipulation of the lever 11b for adjusting the flow rate of the nozzle 11. This manipulation can be necessary and useful in the case of a reversible nozzle, or if the operator wishes to change the nozzle. This embodiment also allows the protection device 2 to adapt to a spray gun which comprises a trigger 14 and optionally a protection 15 which have an extension along a direction parallel to the first axis (Oz) and the tightening direction jaws, where the devices of the prior art do not give such flexibility of adaptation.

This embodiment of the male part in the form of an assembly screw 24 also provides quite a wide latitude for adapting the protection device to the various spray guns 1 on the market, since the distance between the protective bell 23 and the adapter 21 can be reduced or increased by screwing or unscrewing screws 24.

Finally, this embodiment makes it possible to limit the size of the device when it is not in use, the assembly screws 24 being able to be either completely screwed onto the adapter 21 or completely unscrewed for the storage of the latter.

The screws 24 are preferably all screwed to the same depth.

The embodiment of the male and female portions in the form of separate elements makes it possible to stabilize the position of the flange 231 during the operation of the spray device 1, which is known to cause significant vibrations. Indeed, in this case, the protective cover 23 comes to rest on the adapter 21 at the level of the plurality of separate elements of the male part. An embodiment in the form of four separate protruding elements 24 thus contributes to better stability of the protective bell 23 than two separate protruding elements 24, which themselves will allow better stability than with a male portion formed from a single protruding element 24.

The projecting element(s) 24 separate from the male portion of a given jaw are placed at a certain distance from the center of the recess of the jaw in the direction in which the jaws are tightened, inter alia so as not to limit the movement of the jaw. lever 11b of nozzle 11.

The position of the projecting elements 24 separated from the male portion (respectively female) on the upper 211 and lower 212 jaws is chosen so that the nozzle holder 12, nozzle protection 122 possibly included, and the nozzle 11 of the gun 1 of a spraying device commonly used in the construction industry can be inserted between these projecting elements when the upper 211 and lower 212 jaws of the jaw enclose the nozzle holder 12.

The elements 211a to 211f and 212a to 212f can form an assembly substantially symmetrical with respect to the plane (xOz) when the upper 211 and lower 212 jaws of the jaw are tightened to the maximum against each other so as to enclose the gun 1 of the spray device.

In this case, the forces applied to the protective device 1 due to the vibrations of the spray gun are distributed, and in a relatively homogeneous manner, on the different male portions. This arrangement makes it possible in particular to increase the service life of the protection device 2.

In the case where each of the upper 211 and lower 212 jaws comprises at least one separate projecting element 24 from the male portion of the device for assembling the protective cover 23 to the adapter 21, when the upper 211 and lower 212 jaws are tightened or loosened relative to each other, the relative distances between the projecting elements 24 disjointed from the male portion of one of the jaws and the projecting elements 24 disjointed from the male portion of the other jaw vary.

This arrangement allows flexible adaptation of the protective device 2 to a wide variety of spray gun 1, with a simple assembly method, as will be seen later.

The second assembly portion 232 of the device for assembling the protection bell 23 to the adapter 21 is formed on the protection bell 23.

In the case of an assembly device by cooperation of shapes comprising a male part and a female part, the second assembly portion 232 can be the female part.

In this particular embodiment, the female element of the assembly device of the protective cover to the adapter by cooperation of shapes is therefore the assembly portion 232 of the flange 23. The second assembly portion 232 can thus comprising one or more recesses 232a, each comprising at least a first portion 232a1 of complementary shape to a projecting element 24 with which it is intended to cooperate.

In the case where the male portion of the assembly device of the protection bell to the adapter comprises four assembly screws 24 placed on the lateral branches of the central parts 211a and 212a in the form of a U, the second assembly portion 232 includes four recesses 232a.

The first portion 232a1 has a shape complementary to that of the male element intended to be inserted therein. This portion is therefore for example the complement of the screw head of an assembly screw 24 of the protective bell 23 to the adapter 21.

At least one of the recesses 232a further comprises, in a particular embodiment, a second portion 232a2 extending from the first portion 232a1 in the tightening direction and in continuity with the first portion 232a1. At least one characteristic dimension of the second portion 232a2 is less than a characteristic dimension of the portion 232a1.

Thanks to this arrangement, a projecting element 24 can slide in the clamping direction of the first portion 232a1 towards the second portion 232a2 to pass from an unlocked position to a locked position. The unlocked position allows the assembly or disassembly of the male and female portions by translation of the protective bell 23 relative to the adapter 21 along the first axis (Oz). In the locked position, the translation movement of the protection bell 23 relative to the adapter 21 along the first axis (Oz) is blocked.

In one embodiment, the passage from the locked position to the unlocked position is carried out by the operator, for example by a rotational movement around the first axis of the protective bell 23 with respect to the adapter 21, in particular in the case of a bayonet assembly device.

The passage from the unlocked position to the locked position can in another embodiment be obtained by tightening the tightening element in the tightening direction.

The passage from the locked position to the unlocked position can in this other embodiment be obtained by loosening the clamping element in the clamping direction.

The material forming the jaws may have a certain flexibility, so that an elastic deformation of the jaws is possible during tightening. This arrangement makes the protective device adaptable to different types of spray guns.

In a particular embodiment, in the locked position, the protective bell 23 can be embedded in the adapter 21, that is to say that no relative movement of the protective bell 23 with respect to the adapter 21 is not possible.

For example, when the clamping of the jaw is sufficient, it causes the assembly screws 24 to be tensioned so that the protective bell 23 can rest on these assembly screws 24. The friction of the protective bell 23 on the assembly screws 24, possibly combined with the fact that the direction of the tensioned assembly screws 24 may not be parallel with the axis of the jet, is sufficient to ensure the embedding connection.

In particular, in the case of a female portion comprising four recesses 232a, the second portions 232a2 of these recesses can for example form a square of axis (Oz) when the jet protection device 2 is installed on the spray gun, as shown on the figure 4 . The length a on the side of the square is in this case equal to the distance d between the centers of the two threaded assembly recesses 211c (or equivalently 212c) of the upper jaw 211 (or equivalently of the lower jaw 212). In this case, two first portions 232a1 of two different recesses 232a placed on an axis parallel to the tightening direction can for example be spaced apart by a distance less than the distance between the two male elements which are inserted into the relevant recesses.

In the case of a female portion comprising four recesses 232a, the second portions 232a2 of these recesses can also form a rectangle in the plane orthogonal to the first axis (Oz) when the jet protection device 2 is installed on the spray gun , as shown in the figure 4 . A rectangle with a height of around 80 mm and a width of around 60 mm to 80 mm is suitable, for example. In this case, the collar 231 can take a frustoconical shape, the smallest diameter of which is of the order of 30 to 35 mm and the highest diameter of the order of 120 to 140 mm, the length of the collar 231 which can be of the order of 5 cm to 40 cm.

In this way, when the device for clamping the upper 211 and lower 212 jaws is sufficiently tight, the male elements are necessarily at the level of the second portions 232a2 and therefore in the locked position.

Thanks to all of these arrangements, it is possible to easily mount and dismount the protection device 2 on a spray gun 1. It will be noted that to set up the wind protection device 2 on a spray gun 1 , no unscrewing or disassembly of the elements of this gun is necessary thanks to the two-part design of the adapter 21.

When the protection device 2 is mounted on the spraying device 1, they form a spraying assembly making it possible to apply a fluid by projecting it onto a surface while guiding and protecting the jet of fluid. Preferably, the protection device 2 is mounted on the nozzle holder 12, that is to say that the upper jaw 211 and the lower jaw 212 surround at least part, and preferably exclusively, the nozzle holder 12.

The method of mounting the protective device 2 on the spray device to form the spray assembly can be as follows.

In a first step, the upper 211 and lower 212 jaws of the completely separate adapter 21 are placed on either side of a spray gun 1, so as to form a jaw enclosing the spray gun and so as to that the upper jaws 211 and lower 212 are symmetrical to each other with respect to the horizontal plane containing the axis of the jet.

In a second step, the clamping device of the upper 211 and lower 212 jaws is partially tightened, so that the upper 211 and lower 212 jaws are loosely connected to each other and to the spray gun 1 , that is to say that they do not need to be held by an operator to stay around the nozzle holder 12 but retain a certain freedom of movement relative to each other.

In a third step, the first portion and the second portion of the device for assembling the protective cover 23 to the adapter 21 are assembled.

For example, if the first assembly portion consists of projecting elements 24, these are inserted into the first portions 232a1 of the recesses 232a of the second assembly portion which are complementary to them. More precisely, the bell 23 is fitted onto the nozzle holder 12 by passing the protection 122 of the nozzle holder 12 at least partly, and preferably completely, inside the bell 23, and the insertion of the projecting elements 24 in the second assembly part 232 is made.

This insertion step is of course done without difficulty if the first portion comprises a single protruding element 24. In this case, an intermediate step of locking the device for assembling the protective cover to the adapter is necessary.

If, on the contrary, the first portion comprises several protruding elements, as the dimensions of the outline formed by the first portions 232a1 are for some less than those of the outline formed by the protruding elements 24 to allow subsequent locking, the freedom of movement is taken advantage of. provided by the partial tightening of the clamping device. One can for example first insert the projecting elements 24 of the upper jaw 211 in the first portions 232a1 of the recesses 232a which are complementary to them, then in a second time, by a rocking movement of the lower jaw 212, come and place the elements projections 24 of the jaws 212 facing the first portions 232a1 which are complementary to them and proceed with the insertion of these projecting elements 24.

In a fourth step, the clamping device of the upper 211 and lower 212 jaws is tightened until the spray gun is embedded in/fixed rigidly to the jaw.

It is understood that this tightening causes the passage of the assembly device from the protective cover 23 to the adapter 21 in the locked position, so that the locking step is not necessary.

The clamping can be chosen in the whole range of positions of the upper 211 and lower 212 jaws relative to each other corresponding to this locked position, which allows the protection device to adapt to different spray guns. In this sense, the protective device is therefore “universal”.

This range of positions is of course defined by the shape of the second portions 232a2, which can be a disc portion, or rectangular and each extend on one side only of a given first portion 232a1 or on both sides in the direction Clamping.

It is therefore possible to envisage various shapes and dimensions for the second portions 232a2.

It is in particular possible for two given recesses 232a to have different second portions 232a2 (and/or first portions 232a1), in which case the corresponding projecting elements 24 also have different shapes and/or dimensions.

This arrangement can facilitate the assembly of the protection device 2 by helping the operator to identify the elements intended to cooperate.

Otherwise, the upper 211 and lower 212 jaws of the protective device 2 have the advantage of being interchangeable.

The exchange of the two upper 211 and lower 212 jaws between the top and the bottom is however only possible in the embodiments where these jaws are both configured to withstand the bending which can be imposed on them when a pistol of spray 1 is clamped between these two jaws. Thus, if the central part of the two upper 211 and lower 212 jaws is in the shape of a rectangular U, the exchange is not always possible if the central branches of the rectangular U of the two jaws 211 and 212 do not have the same height. .

The recesses 232a can be through.

They can also be open only on the side by which the complementary projecting element 24 is to be inserted. In the latter case, the depth of the recess in the direction of the axis of the jet is limited and can for example be chosen so that the projecting element 24 can slide in the recess 232a in a direction perpendicular to the axis of the jet, but that its translation along the axis of the jet is limited in the range of locked positions.

The protection device 2 thus described offers great flexibility in its adaptation, which makes it particularly suitable for its installation on an airless type gun 1 which comprises components such as the lever 11b of the nozzle or the trigger 14 and the protection 15 which may hinder or be hindered by the installation of a protection device such as those found in the prior art.

Claims (13)

Device for protecting (2) a jet of liquid emitted by a device for spraying liquid under pressure, the protection device extending along a first axis intended to be identical to an axis of emission of the jet of liquid and comprising an adapter (21), a protective bell (23) and a device for assembling the protective bell to the adapter: has. the device for assembling the protective cover to the adapter comprising a first assembly portion (211c and/or 212c, 24) and a second assembly portion (231), b. the adapter comprising: - an upper jaw (211) and a lower jaw (212) of a jaw intended to enclose a portion of the spray device whose jet emission axis is arranged along the first axis, - a removable clamping device ((211e) and/or (212e), 24) of the upper and lower jaws along a second axis orthogonal to the first axis so that the upper jaws (211) and lower (212) can be either separated from each other, or attached to each other with a variable spacing between a minimum spacing and a maximum spacing along the second axis, called tightening, - said first assembly portion formed at least in part on at least one of the upper jaw (211c) and the lower jaw (212c), vs. the liquid jet protection bell (23) comprising: - a collar (231) tubular or tapered axis the first axis - the second assembly portion (232), the device for assembling the protection bell to the adapter can take two positions: - a locked position in which the first assembly portion is fixed relative to the second assembly portion at least in translation relative to the first axis so that, when the upper jaw and the lower jaw are attached to each other the other, the protective bell is fixed relative to the adapter at least in translation relative to the first axis, - an unlocked position in which the first portion and the second assembly portion are free relative to each other, the device for clamping the upper and lower jaws being configured to, when tightened, cause the passage of the device for assembling the protection bell to the adapter from the unlocked position to the locked position. Device for protecting a jet of liquid according to Claim 1, in which the removable device for clamping the upper and lower jaws is itself formed of two so-called left and right extensions which are symmetrical to each other with respect to the said axis of Tightening. Device for protecting a jet of liquid according to Claim 1 or Claim 2, in which a male portion and a female portion are defined from among the first portion of the device for assembling the protection bell to the adapter and the second portion of the device for assembling the protection bell to the adapter and in that - the male portion is made up of at least two separate protruding elements (24), - the female portion is made up of at least two disjoint recessed elements (232a), - the male and female portions cooperating by their shapes for the assembly of the first and the second portion, - each jaw comprising at least one of said separate elements constituting the first portion of the device for assembling the protective bell to the adapter, - the device for assembling the protective cover to the adapter being locked at least when the distance between the two jaws is minimal. Device for protecting a jet of liquid according to Claim 3, in which the at least two separate elements of the female portion (232a) form a symmetrical assembly with respect to the said clamping axis and/or with respect to an axis orthogonal to the said first axis and clamping axis. A liquid jet protection device according to any one of claims 1 to 4 wherein the collar (231) is rigid. A liquid jet shield according to any one of claims 1 to 5 wherein the flange (231) includes a recess for handling a nozzle of the spray gun. A liquid jet protection device according to any one of claims 1 to 6 configured to be mounted on said pressurized liquid device without dismantling one or more elements of the pressurized liquid device. Device for protecting a jet of liquid according to Claim 7, adapted to be mounted on a pressurized liquid spraying device comprising a nozzle and a nozzle adjustment lever without dismantling the nozzle and/or to allow manipulation of the nozzle adjustment lever and/or the replacement of the nozzle when the protective device is mounted on the spray device. Device for protecting a jet of liquid according to any one of Claims 1 to 8 , characterized in that the device for assembling the protective bell (23) to the adapter (21) comprises a device for adjusting the positions relative to the protective bell and the adapter along the first axis. Device for protecting a jet of liquid according to Claim 9, in which the adjustment of the relative positions of the protection bell and of the adapter along the first axis makes it possible to provide a space for access to a nozzle of the spraying device of pressurized liquid and/or to mount the protection device on pressurized liquid spraying devices of different characteristic dimensions along the first axis. Spray assembly comprising a spray device (1) and at least one protective device (2) according to any one of the preceding claims, in which the spray device (1) comprises a base and a removable part, the removable part comprising a nozzle and a nozzle holder (12), the jaw formed by the upper jaw (211) and the lower jaw (212) gripping a portion of the nozzle holder (12). Method of assembling a device for protecting a jet of liquid to a device for spraying pressurized liquid, the protection device extending along a first axis intended to be identical to an axis of emission of the jet of liquid and comprising an adapter (21), a protective cover (23) and a device for assembling the protective cover to the adapter according to any one of claims 1 to 10 comprising the steps: has. for positioning the upper and lower jaws, in which the upper and lower jaws (211, 212) of the adapter (21), initially completely separated, are placed on either side of a spray gun 1, so as to form a jaw enclosing the spray gun and so that the upper and lower jaws (211, 212) are placed on either side of a horizontal plane containing the axis of the jet; b. of the clamping device, in which the clamping device of the upper and lower jaws (211, 212) are placed and partially tightened, so that the upper and lower jaws (211, 212) are attached to each other with play and so that they do not need to be held by an operator to stay around the nozzle holder (12); vs. assembly, in which the first portion and the second portion of the device for assembling the protective cover (23) to the adapter (21) are assembled; d. clamping device, in which the clamping device of the upper and lower jaws is clamped until the spray gun is embedded in the jaw, this clamping step causing the assembly device to pass from the protective bell to the adapter from the unlocked position to the locked position. Method of assembling a liquid jet protection device to a liquid spraying device according to claim 11 , characterized in that it further comprises the steps: 1. a device is provided for assembling the protective cover (23) to the adapter (21) comprising a device for adjusting the relative positions of the protective cover (23) and of the adapter (21) according to the first axis; 2. the relative positions of the protective bell (23) and of the adapter (21) are adjusted along the first axis.

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