EP4098370A1 - Vorrichtung zum schutz vor einem flüssigkeitsstrahl - Google Patents

Vorrichtung zum schutz vor einem flüssigkeitsstrahl Download PDF

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Publication number
EP4098370A1
EP4098370A1 EP22176734.6A EP22176734A EP4098370A1 EP 4098370 A1 EP4098370 A1 EP 4098370A1 EP 22176734 A EP22176734 A EP 22176734A EP 4098370 A1 EP4098370 A1 EP 4098370A1
Authority
EP
European Patent Office
Prior art keywords
adapter
axis
jet
jaw
liquid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP22176734.6A
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English (en)
French (fr)
Inventor
Guillaume DUQUESNOY
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Air Prod Formation SAS
Original Assignee
Air Prod Formation SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Air Prod Formation SAS filed Critical Air Prod Formation SAS
Publication of EP4098370A1 publication Critical patent/EP4098370A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/28—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with integral means for shielding the discharged liquid or other fluent material, e.g. to limit area of spray; with integral means for catching drips or collecting surplus liquid or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/16—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area
    • B05B12/32—Shielding elements, i.e. elements preventing overspray from reaching areas other than the object to be sprayed
    • B05B12/36—Side shields, i.e. shields extending in a direction substantially parallel to the spray jet

Definitions

  • 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.
  • 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® ”).
  • 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.
  • 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.
  • medium to high viscosity fluids such as dyes, lacquers and varnishes
  • 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.
  • 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.
  • the nozzle outlet is placed approximately 10cm to 50cm from the surface to be coated.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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).
  • 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.
  • 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.
  • 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.
  • This arrangement also makes it possible to give a certain latitude for adjusting the device to various dimensions of spray guns.
  • 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
  • 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.
  • the protective device can thus be adapted to different types of spray guns.
  • 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.
  • 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.
  • the collar is rigid.
  • the collar resists any shocks that it may undergo during handling and/or between two handling operations.
  • the collar comprises a recess making it possible to manipulate a nozzle of the spray gun.
  • the latter can be mounted on the pressurized liquid device without dismantling one or more elements of the pressurized liquid device.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the axis of the jet is a horizontal axis.
  • 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.
  • 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.
  • 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.
  • the middle plane is also a middle plane for the nozzle guard 122.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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 .
  • 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.
  • 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.
  • 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 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 extends in the left-right direction, but also in the tightening direction.
  • the central part 211a (respectively 212a) of the upper jaw 211 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • a protection device 2 can have a mass of less than 500g, or even 400g.
  • the central parts 211a and 212a of the upper 211 and lower 212 jaws can be different from each other.
  • 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.
  • the dimensions of the central part of the upper jaw can be greater than those of the lower jaw.
  • 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.
  • 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.
  • 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.
  • PLA polylactic acid
  • 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.
  • 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.
  • 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.
  • 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).
  • 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.
  • 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.
  • the male portion of the assembly device of the protection bell to the adapter comprises two assembly screws 24.
  • 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.
  • 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.
  • 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.
  • the male portion of the assembly device of the protection bell to the adapter comprises four assembly screws 24.
  • 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 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.
  • 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 is 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.
  • 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.
  • 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
  • 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.
  • the second assembly portion 232 can be the female part.
  • 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.
  • 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.
  • 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).
  • the locked position the translation movement of the protection bell 23 relative to the adapter 21 along the first axis (Oz) is blocked.
  • 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.
  • the protective bell 23 in the locked position, 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.
  • the clamping of the jaw 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 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).
  • 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.
  • 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.
  • 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.
  • the male elements are necessarily at the level of the second portions 232a2 and therefore in the locked position.
  • the protection device 2 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • two given recesses 232a 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.
  • the upper 211 and lower 212 jaws of the protective device 2 have the advantage of being interchangeable.
  • the recesses 232a can be through.
  • the complementary projecting element 24 can also be open only on the side by which the complementary projecting element 24 is to be inserted.
  • 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 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.

Landscapes

  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
EP22176734.6A 2021-06-02 2022-06-01 Vorrichtung zum schutz vor einem flüssigkeitsstrahl Withdrawn EP4098370A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2105832A FR3123577B1 (fr) 2021-06-02 2021-06-02 dispositif de protection d’un jet de liquide

Publications (1)

Publication Number Publication Date
EP4098370A1 true EP4098370A1 (de) 2022-12-07

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ID=76730849

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Application Number Title Priority Date Filing Date
EP22176734.6A Withdrawn EP4098370A1 (de) 2021-06-02 2022-06-01 Vorrichtung zum schutz vor einem flüssigkeitsstrahl

Country Status (2)

Country Link
EP (1) EP4098370A1 (de)
FR (1) FR3123577B1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2597573A (en) * 1949-10-03 1952-05-20 Groff Jerald S De Spraying apparatus
US5431341A (en) * 1992-12-01 1995-07-11 The Broyhill Co. Drift control enclosure for an agricultural sprayer
WO2000066272A1 (en) * 1999-05-01 2000-11-09 Corwin Kohls Gardening applicator for delivering liquid chemicals to selected vegetation
KR20130125343A (ko) 2013-10-29 2013-11-18 (주)칠칠공사 에어 리스 스프레이 건 용 도료 비산 방지 커버 및 그 커버가 장착된 에어 리스 스프레이 건
US9038922B1 (en) * 2009-07-27 2015-05-26 Frederick C. McLeod Spray containment device and methods of use
KR102259831B1 (ko) * 2020-12-11 2021-06-01 김소중 비산 저감 기능을 가지는 페인트 스프레이 도장장치

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2597573A (en) * 1949-10-03 1952-05-20 Groff Jerald S De Spraying apparatus
US5431341A (en) * 1992-12-01 1995-07-11 The Broyhill Co. Drift control enclosure for an agricultural sprayer
WO2000066272A1 (en) * 1999-05-01 2000-11-09 Corwin Kohls Gardening applicator for delivering liquid chemicals to selected vegetation
US9038922B1 (en) * 2009-07-27 2015-05-26 Frederick C. McLeod Spray containment device and methods of use
KR20130125343A (ko) 2013-10-29 2013-11-18 (주)칠칠공사 에어 리스 스프레이 건 용 도료 비산 방지 커버 및 그 커버가 장착된 에어 리스 스프레이 건
KR102259831B1 (ko) * 2020-12-11 2021-06-01 김소중 비산 저감 기능을 가지는 페인트 스프레이 도장장치

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Publication number Publication date
FR3123577A1 (fr) 2022-12-09
FR3123577B1 (fr) 2025-10-17

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