KR101098129B1 - Easy clean spray gun - Google Patents

Abstract

A spray gun 101 has a spray head 150 connected to a body 102 of the spray gun 101 and a reservoir 156 connected to the spray head 150 for supplying liquid to a spray nozzle 153 of the spray head 150. The spray head 150 is arranged so that liquid from the reservoir 156 is delivered to the spray nozzle 153 without passing through the spray gun body 102 in response to actuation of the spray gun 101 via a trigger 105. The spray head 150 is releasably secured and can be detached from the spray gun body 102 and thrown away after use. The reservoir 156 is mounted on the spray head 150 and can be removed and thrown away with the spray head 150 after use.

Description

Easily cleaned spray gun {EASY CLEAN SPRAY GUN}

The present invention relates to improvements in or related to liquid spray devices such as spray guns. More specifically, the present invention relates to a system for transferring liquid to be sprayed. The present invention is particularly applied to spray heads and / or when replacing a spray gun to spray other liquids in terms of reducing the amount of cleaning of the spray gun required to complete the spraying.

Spray guns are widely used in car shops to respray a repaired vehicle after an accident. In known spray guns, the liquid is contained in a storage container attached to the spray gun and supplied to the spray nozzle. When exiting the spray nozzle, the liquid is sprayed and forms a spray with compressed air supplied to the spray nozzle. The liquid may be gravity fed, suction fed, or more recently, pressure fed, from a compressed air line to a storage vessel with an air bleed line.

 Conventionally, the liquid is contained in a rigid container detachably mounted to the spray gun and delivered to the spray nozzle by the operation of the gun's manual trigger mechanism. After spraying, the container is removed and the gun and container are cleaned for reuse.

In this arrangement, the gun and container must be thoroughly washed with solvent to remove all residues of the liquid to prevent cross contamination with the next liquid being sprayed. Special problems arise when cleaning the gun to ensure that no deposits are formed in the gun that may affect the operation of the spray gun. As a result, the spray nozzle must be disassembled so that the inner passage of the spray gun and the spray nozzle can be properly cleaned. This is time consuming, the use of solvents is undesirable in view of health and safety, and problems arise with the disposal of solvents after use.

Recently, a system has been developed that allows storage containers to be discarded after use, reducing the amount of cleaning required after the spray has been completed. With this system, however, the spray gun must still be cleaned, including the spray nozzle, to remove all traces of the liquid before cleaning the spray gun or spraying other liquids.
Patent DE-A-4302911 discloses a paint spray gun with a replaceable disposable spray nozzle fixedly detachable to a spray gun body that is removed after use and replaced with a new spray nozzle. The spray nozzle has a branch pipe for the supply of liquid to be sprayed and an integrated (built-in) needle valve shaft that acts as an open and closed valve. The rear end of the spray nozzle is inserted into the spray gun body and secured by tightening the horizontal bolt to engage the rear end of the spray nozzle. The needle valve shaft is connected to the trigger mechanism in the spray gun body by securing the clamping sleeve to engage the free end of the shaft. A pair of inward facing air streams is provided by a cap nut screwed to the spray gun body away from the spray nozzle.

The present invention has been made in consideration of the above problems and disadvantages of existing transmission systems for spraying liquids.

More specifically, embodiments of the present invention provide an improved liquid transfer system for use in a spray gun that can simplify cleaning of the spray gun when spraying is finished and / or when replacing in the spray gun for spraying with another liquid. do.

In particular, at least one embodiment of the present invention includes a liquid delivery system including a spray head through which liquid is delivered to a spray nozzle from a storage container connected to the spray head without passing through the spray gun body.

Alternatively, at least one embodiment of the present invention provides a liquid delivery system in which the spray head may be detached from the spray gun and discarded after use such that the amount of solvent used to clean the spray gun may be reduced.

In addition, at least one embodiment of the present invention provides a liquid delivery system in which a reservoir of liquid to be administered is mounted to the spray head and capable of separating the spray head from the spray gun.

Thus, according to one aspect of the invention, there is provided a liquid spray device as defined in claim 1.

As used herein, the term "liquid" refers to adhesives, sealants, fillers, putties, powder coatings that may be supplied in a nebulized or unsprayed form depending on the properties and / or application of the material. Paints, primers, base coats, lacquers, varnishes and similar paint-like materials, as well as other materials such as blasting powders, abrasive slurries, mold release agents and foundry dressings Refer to any type of flowable material that can be applied to a surface using a spray gun (whether or not to color the surface), the term "liquid" should be interpreted accordingly.

Cleaning the spray gun is simplified by connecting the reservoir to the spray head and placing the spray head so as to be detachable from the spray gun. As a result, it is possible to reduce the amount of solvent used to clean the spray gun.

More specifically, the liquid discharged from the storage container in use is delivered to the spray nozzle through the spray head body without passing through the spray gun body. In this way, the extent to which the spray gun body is contaminated by the liquid and the amount of cleaning required when the spray is finished or when replacing the spray gun for spraying with other liquids can be reduced.

Preferably, the spray head is disposable and can be discarded after use. In this way, cleaning of the spray head can be avoided, and the spray gun can be replaced to attach a new spray head to a clean spray nozzle connected to a reservoir for liquid to dispense another liquid.

The mating formations for detachably securing the spray head to the spray gun can form a bayonet type connection that facilitates quick connection / disconnection of the spray head by simply pressing and turning. Any other suitable form of mating formations providing detachable connections can be used.

The reservoir may be provided at a remote location and connected to the spray head by a flexible delivery line. Preferably, the delivery line includes a valve that is manually operable to block the delivery line when disconnected from the spray head.

Alternatively, the reservoir may be mounted to the spray head. For example, the spray headbody may have an inlet connected to the reservoir. In one arrangement, the connection between the reservoir and the spray head is removable such that the reservoir can be separated from the spray head (eg, bayonet type connection). In this way, the storage container is reusable. More preferably, the storage container or at least a portion of the storage container that is contaminated in contact with the liquid is disposable and may be discarded after use. In this way, contaminated parts can be discarded and the spray gun can be reused with new spray heads and storage containers. As a result, the amount of cleaning required at the end of spraying or when replacing the liquid to be sprayed is reduced.

The storage container may be crushed as the liquid is used and discharged, and may be prefilled with a liquid connected to the spray head or empty to be filled by the last user. If the reservoir is prefilled, the liquid outlet has a closure to seal the reservoir before the reservoir needs to be fitted to the spray head.

Preferably, the spray nozzle is adapted to spray the liquid to form a spray. For example, the spray nozzle may be arranged to mix the liquid coming from the nozzle with the compressed air supplied.

In a preferred arrangement, the spray nozzle has a pair of compressed air holes spaced forward and inward of the central hole disposed on both sides facing the central hole for liquid surrounded by concentric annular holes for compressed air. In this way, the liquid exiting the central hole is mixed with the concentric annular and inwardly directed air streams to form a fine spray that is atomized and applied to the substrate.

The air flow from the inward openings to adjust the spray nozzles for dispensing other liquids is adjustable. For example, an inwardly directed hole may be provided by a member mounted to the spray head body, and a set of replaceable members may be detachable to the spray head body, for example, to change the required spray parameters or spray pattern. It is provided with a connection.
Preferably, the needle of the trigger mechanism controls the administration of liquid to spray the liquid and the supply of air to the spray nozzle. For example, the needle may move from the forward position of closing the bore to the retracted position of opening the bore when the trigger mechanism is actuated. In this arrangement, the needle should be wiped clean when the spray head is removed, but this is a simple task and can be done effectively without the use of solvent.

According to another aspect of the present invention, there is provided a spray head attached to the spray gun body as defined in claim 20.

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Spray heads can be used for spray guns of gravity feed, pressure feed or suction feed. Existing spray guns having an inlet connected to the liquid storage container can be converted for use with the spray head by closing the inlet (eg with a blanking plug). If necessary, an adapter may be provided to connect the spray head body to the spray gun body.

The reservoir of liquid to be administered can be separated from the spray gun with the spray head, and can be mounted to the spray head. The storage container may be detachably connected to the spray head and may be disposable or recyclable. Alternatively, the spray head and reservoir may be permanently joined together.

The spray head may be adjusted to spray the liquid to be administered. For example, to spray liquid and make a spray, the spray nozzle may be positioned such that the opposite inwardly directed air stream mixes with the concentric flow of liquid and air from the spray nozzle. Spray parameters or spray patterns can be controlled by adjusting the inwardly directed air flow.

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The spray head and reservoir may be "all-in-one".

Other features, advantages, and advantages of the invention will become apparent from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings.

1 is a side view of a prior art gravity feed spray gun showing components of a spray nozzle away from the body of the spray gun.

FIG. 2 is a side view of the main body of the spray gun shown in FIG. 1, partly in cross section.

Figure 3 is a side view of the gravity feed spray gun according to the present invention.

4 is a perspective view of the spray head and the reservoir shown in FIG.

Fig. 5 is a perspective view of the lid of the spray head and the reservoir shown in Fig. 4;

6 is an exploded isometric view of the spray head and lid shown in FIG.

FIG. 7 is a perspective view showing another reservoir attached to the spray head shown in FIGS. 4 to 6; FIG.

FIG. 8 is a perspective view showing another connection between the spray head and the reservoir shown in FIG.

9 is a perspective view of an inhalation supply spray gun in which the present invention is implemented.

10-12 show another apparatus for supplying a liquid for spraying to a spray head.

1 and 2 of the accompanying drawings, there is shown a typical prior art paint spray gun 1 of gravity supply.

The gun 1 comprises a main body 2, a handle 3 extending downward from the rear end of the main body 2, and a spray nozzle 4 at the tip of the main body 2. The spray gun 1 is operable by hand by a trigger 5 mounted on the side of the spray gun 1.

A paint reservoir (not shown) is detachably secured to the gun 1 via an internal threaded inlet 7 at the top of the gun 1. This reservoir may have an external threaded outlet for screwing directly into the inlet 7 or into a screwed adapter (not shown) in the inlet 7. The reservoir can be any structure known in the art, and supplies paint to the spray nozzle 4 through an inner passage 8 formed in the body 2 of the gun 1.

The spray nozzle 4 comprises an inner part 11 and an outer part 12 which is screwed to the tip of the body 2 of the gun 1 and holds the inner part 11.

The inner part 11 has a through bore 13 which ends at the tip in the hole 10. The rear end of the bore 13 communicates with the passage 8.

The trigger 5 is connected to the rear end of the needle 9 which extends through the passage 8 and is received in the bore 13 in the inoperative position of the trigger 5 to close the hole 10 and paint in the passage 8. Prevents leaks.

The tip of the inner part 11 is received into a central hole (not shown) of the outer part 12 and forms an annular hole concentric with the hole 10. The outer part 12 has a pair of horns 17 protruding forward from the spray nozzle 4 on opposite sides of the hole 10. The horn 17 is provided so as to face the holes 17a oriented inward.

In use, the spray gun 1 is connected to a pressure air source (not shown) via a connector (not shown) at the bottom of the handle 3. Pressure air is delivered to the spray nozzle 4 through the inner passages 14a, 14b, 14c in the handle 3 and the body 2 of the spray gun 1 in response to the trigger 5 actuation.

The flow of air is regulated by an on / off valve 15 actuated by the trigger 5 and a flow regulator 6a, 6b capable of adjusting the flow rate by the rotatable regulating knobs 16a, 16b. do.

The trigger 5 is deflected to the non-operational position of the needle 9 closing the spray nozzle 4 to prevent paint leaking from the hole 10 and the valve 15 shuts off the air supply to the spray nozzle 4. To close.

When the user pulls the trigger 5, the needle 9 retracts into a position where the tapered end 9a of the needle 9 is received at the rear end of the bore 13 to open the spray nozzle 4. As a result, the liquid exits the passage 8 through the bore 13 and exits the hole 10. At the same time, the valve 15 opens to deliver air from the hole concentric with the hole 10 and to the spray nozzle 4 exiting from the opposite hole 17a of the horn 17 on the opposite side of the spray nozzle 4. do.

The horn 17 mixes with the air stream facing inwards and sprays the intensive paint / air stream from the spray nozzle 4 to form a spray. The displacement of the trigger 5 from the user-controlled non-operational position regulates the speed at which the paint is released and the air flow to produce the required spray.

After use, the reservoir can be separated from the spray gun 1 for cleaning or disposal, depending on the type of reservoir being mounted. The spray gun 1 then removes all paint debris from the needle 9 and spray nozzle 4 in the inner passage 8 as well as from the inner passage 8 connecting the spray nozzle 4 to the inlet 7. To be cleaned.

To ensure that no paint remains in the spray gun (1) after cleaning, which may form a deposit in the spray gun (1) which may cause cross contamination when spraying other liquids or may affect the operation of the spray gun. In general, the spray nozzle 4 requires disassembly and reassembly.

This cleaning is time consuming and the solvents commonly used for cleaning are exposed to the user. The use of the solvent poses a risk to the health and safety of the user and causes problems with the disposal of the solvent after use. All of this adds significantly to the cost of work.

3 to 6, there is shown a gravity supply spray gun according to a first embodiment of the present invention, such as starting with 100 for convenience to indicate a portion corresponding to the spray gun shown in FIGS. Reference numerals are used.

In this embodiment, the gravity feed spray gun 101 is described below to control the operation of the body 102, the handle 103 extending downward from the body 102, and the spray gun 101. It has a trigger 105 mounted pivotally to the body 102.

The detachable spray head 150 is attached to the body 102 of the spray gun 101 with a bayonet connection that allows the spray head 150 to be detached from the gun 101. In this embodiment, the spray head 150 is made of a lightweight plastic material, for example by molding, although other materials may be used.

The spray head 150 has a socket 151 (FIGS. 4-6) at the rear end and a spray nozzle 153 at the front end. A paint reservoir 156 is mounted above the spray head 150 to supply paint to the spray nozzle 153 as described below so that the outlet 155 is connected to the inlet 154 between the leading and trailing ends. .

The wall of the socket 151 is provided with a pair of opposing bayonet grooves 152 (only one shown) comprising an axial guide portion 152a ending at an inner end of the outer retaining portion 152b.

The tip of the body 102 of the gun 101 is a pair of outwardly protruding lugs (not shown) that can be twisted and engaged with the grooves 152 to secure the spray head 150 to the spray gun 101. ). Another form of detachable connection may be provided between the spray head 150 and the gun 101.

As best seen in FIG. 6, the spray head 150 includes a hollow tubular body 158, an insert 159, and a pair of air horn members 160, 161.

The socket 151 is provided at the rear end of the main body, and the insert 159 is push-fit to the main body 158 from the rear end. An annular flange 162 behind the insert 159 may engage the base of the socket 151 to axially position the insert 159 in the body 158.

Insert 159 has an axial through bore 157 that accepts a tapered tip of a needle that regulates paint flow from storage vessel 156. Bore 157 is in communication with a radial inlet tube 163 connected to body 158 via a radial port (not shown) that mediates the end of insert 159.

Insert 159 and body 158 have cooperative formations (not shown) to position insert 159 in the required angular orientation to align the radial port with inlet tube 163.

Inlet tube 163 is connected from paint reservoir 156 to inlet tube 164 to supply paint to spray nozzle 150. The inlet tube 163 has a radial lug 165 adjacent the distal end received in the first axial slot 166 of the wall of the outer tube 164 to position the reservoir 156 relative to the spray head 150. Are arranged at an angle.

Retainer ring 167 lies at the outer end of outer tube 164 and is a second axial slot 169 in the wall of outer tube 164 that is angled offset from first slot 166. Has an axial leg 168 received therein.

The retainer ring 167 has a central hole 170 and a radial slot 171 through which the inlet tube 163 passes through the ring 167 before the ring 167 is placed in the outlet tube 164. . The radial slot 171 is angled offset with respect to the first axial slot 166 when the leg 168 is received in the second axial slot 169.

As a result, the inlet tube 163 is rotated to a position where the lug 165 is offset relative to the radial slot 171 so that the leg 168 can be located in the second axial slot 169. In this way, the reservoir 156 is positioned and held in the spray head 150 in the required angular direction.

The trigger 105 is connected to the rear end of a needle (not shown) that is received in the through bore 157 of the insert. The needle may move in the axial direction of the through bore 157 between a forward position that covers the radial port and a retracted position that opens the radial port in response to actuation of the trigger 105.

In this way, the flow of paint from the reservoir 156 to the spray nozzle 153 is blocked in the forward position of the needle and open in the retracted position. In addition, the needle seals the inner end of the bore 157 at both locations to prevent paint from leaking from the bore 157 into the socket 151 and contaminating the spray gun body 102.

The horn members 160 and 161 are of a similar semicylindrical shape that fits and surrounds the tip of the body 158 of the spray head 150. Horn members 160 and 161 have outer axial ribs 172 with horns 173 on opposite sides of spray nozzle 153.

The rib 172 is formed with an internal air passage 174 that communicates at one end with the facing hole 175 of the horn 173. At the other end, the passage 174 is formed with inner holes 176 (only one shown) that open into the air chamber formed between the horn members 160 and 161 and the body 158.

The rear end of the insert 159 communicates with an air supply path (not shown) to the spray gun body 102. The insert 159 is a radial port through which air can pass into the space between the insert 159 and the body 158 in the spray head 150 for exiting the annular hole 178 (FIGS. 4 and 5). 177) (only one is shown). The annular hole 178 is concentric with the hole 157a at the tip of the bore 157 through which the liquid exits.

The body 158 is open into the air chamber and has a radial port 179 that allows air to pass along the passage 174 of the rib 172 and exit the hole 175 of the horn 173.

In use, a compressed air line (not shown) is connected to the lower end of the handle 103 and an on / off valve of the spray gun body 102 to regulate the supply of air to the spray head 150. Trigger 105 may be moved to operate.

When the user pulls the trigger 105, the needle retracts to open the bore 157 in the insert 159, and the paint supplied from the reservoir 156 to the spray head 150 is transferred to the hole in the spray nozzle 153. Exit 157a). At the same time, the trigger 105 operates an on / off valve that delivers air to the spray head 150 through internal passages (not shown) of the spray gun body 102. Air passes through the spray head 150 and exits the hole 178 concentric with the hole 157a and out of the holes 175 of the horn 173. The horn 173 sends air in and mixes the air with the concentrated paint / air flow from the tip of the nozzle 153, thus spraying the paint to form a spray.

Horn 173 may be detachably secured to the tip of spray head body 158 by any suitable means. For example, the horn members 160 and 161 may be fixed to the spray head body 158. In this way, the horn 173 may be controlled to control the flow and / or direction of air from the horn for mixing with the paint / air flow from the nozzle 153 depending on the desired spraying parameters or spray pattern of the sprayed paint. The spray head 150 may be adjusted by selecting and adjusting the appropriate pair of horn members 160 and 161 in varying sizes and / or positions.

As will be appreciated, the paint does not flow through the spray gun body 102 but directly through the spray head 150 from the reservoir 156 to the spray nozzle 153. As a result, when the spray is finished or when the paint to be sprayed needs to be replaced, the spray head 150 and the reservoir 156 can be separated from the spray gun body 102, and the needle is cleaned and fresh The spray head / storage container combination may be attached to the spray gun body 102. In this way, the required amount of cleaning is reduced and the spray gun 101 can be quickly replaced with minimal decomposition when spraying other liquids.

In this embodiment, the reservoir 156 includes a container 181 that is open at the top, which is closed by the lid 182. The container 181 is made of plastic, has a flexible wall and can be folded in use. The lid 182 is also made of plastic and has sufficient rigidity to maintain its shape during use. The lid is frusto-conical and an outlet tube 164 is provided on top of the lid 182 and connected to the inlet tube 163 of the spray head 150. The peripheral edge of the container 181 is permanently fixed to the edge of the lid 182 by, for example, adhesive or welding.

The storage container 156 is supplied prefilled with the paint or other liquid to be administered and a detachable lid, such as a screw cap (not shown), can be attached to the outlet tube 164. Alternatively, the lid 182 may have a filler hole (not shown) separated from the detachable lid, such as an outlet tube and a screw cap (not shown). In this way, the storage container 156 may be filled by the end user with paint or other liquid that is emptied and sprayed. The filler holes may be arranged to allow for refilling of the reservoir 156 and to allow work to be performed while the reservoir 156 is attached to the spray head 150 of the spray gun 101. A filter (not shown) is coupled to the underside of the lid 182 to block contaminants before the paint reaches the spray nozzle 153.

In use, the container 181 crushes in as the paint exits the storage container 156, and when spraying is finished, the spray head 150 and the storage container 156 can be removed from the spray gun 101. Any paint remaining in storage container 156 may be prepared within a short time, and spray head 150 may be attached back to spray gun 101 to use the paint. If storage container 156 is empty or no remaining paint is required, spray head 150 and storage container 156 may be disposed of as a assembly itself or separately. In this way, contaminated parts of the paint transfer system can be discarded after use.

Referring to Fig. 7, a modification of a storage container for preparing paint or other liquid to be administered is shown. For convenience, the same reference numerals beginning with 200 are used to indicate parts corresponding to the previous embodiment.

In FIG. 7, the lid 282 is separated from the crushed container, and the storage container 256 includes an outer container 290 in which the flexible container is accommodated. The lid 282 is secured to the flexible container by the collar 291, which collar 291 fits the edge of the edge of the lid 282 to secure and seal the lid to the container and the top of the outer container 290 Screwed on.

The flexible container has a lining to the outer container 290, and after use, the lid 282 and the flexible container can be discarded, and the outer container 290 and the collar 291 are fresh clean lids. And can be reused as a flexible container. In use, as the paint escapes from the storage container 256, the flexible container collapses and the outer container 290 has air holes 292 at the bottom to prevent vacuum from forming in the outer container 290. To be distorted.

The outer container 290 and the flexible container may be transparent or translucent to visually recognize the contents, and a dimension scale may be provided on the outer container 290 to indicate the volume of the contents. In this arrangement, the flexible container can be supported within the outer container and can be added to or mixed with the container before paint or other liquid is attached to the lid 282.

In other respects, the configuration and operation of the spray head 250 and the storage container 256 are similar to those of the previous embodiment and can be understood as a description of FIGS. 3 to 6.

Referring to Figure 8, there is shown another arrangement for detachably securing a storage container to a spray head. For convenience, the same reference numerals beginning with 300 are used to indicate parts corresponding to the previous embodiment.

In FIG. 8, the lid 382 of the reservoir 356 is fitted into the inlet tube 363 of the spray head 350 and sealed by the annular rib 394. The inlet tube 363 has an outer flange 395 at the distal end and the lid 382 has a pair of ring members 396 that engage the flange 395 to secure the reservoir 356 to the spray head 350. Hold.

As shown, the flange 395 has a pair of opposing recesses 397 leading to the flat 398 past the cam lobe 399. In use, the ring member 396 aligns with the recess 397 such that the reservoir 356 passes through the flange 395 when the reservoir 356 is pressed against the spray head 350. The reservoir 356 is then rotated so that the ring members 396 engage the cam lobe 399 and the loop members 396 are deflected out and click and close so that the distal ends 396a are behind the flat 398. Meshes to secure reservoir 356 to spray head 350.

In other respects, the configuration and operation of the spray head 350 and the storage container 356 are similar to those of the previous embodiment and can be understood as a description of FIGS.

9, an inhalation supply spray gun according to a second embodiment of the present invention is shown with the same reference numeral starting with 400 to indicate a part corresponding to the first embodiment. The configuration of the spray head 450 and the reservoir 456 of this embodiment is generally a first, in which the spray-contaminated spray head 450 and the reservoir 456 are disposable and can be discarded after use, thereby reducing the cleaning amount of the spray gun. Similar to the example. Operation of this embodiment is apparent to those skilled in the art who are familiar with inhalation supply spray guns without further explanation.

Referring to Figures 10-12, modifications are shown with various modifications of the paint transfer system of Figures 3-6 that are equipped with other types of paint reservoirs incorporating disposable spray heads. The spray heads used in each of these modifications were similar to those described in the previous examples, and for the sake of convenience used the same reference numerals starting with 500 to indicate the parts corresponding to each figure.

In FIG. 10, a spray head 550 is shown connected to a reusable paint reservoir 540. The spray head 550 has an internal threaded inlet connector 541 and the reservoir 540 has an external thread 544 and an outlet tube 543 that can engage the internal screws of the inlet connector 541. Rigid container 542. After use, the spray head 550 is disposed away from the reservoir 540 and the reservoir 540 is cleaned for reuse with other spray heads. With this arrangement, the total amount of cleaning required is less than any existing system in which paint or other liquid is delivered to the spray head through the internal passageway of the spray gun body requiring cleaning.

In FIG. 11, a spray head 550 is shown connected to a remote paint reservoir (not shown) via a flexible line 545. Flexible line 545 has a connection 546 that is screwed into the inlet connector 541 of the spray head 550. Alternatively, bayonet connections or tapered press fit connections may be provided. After use, the flexible line 545 can be removed from the spray head 550 and the spray head 550 can be removed from the spray gun. Again, the cleaning amount of the spray gun is reduced and the line 545 can be connected to other spray heads as needed. The remote storage container can be used for several spray operations and can be a large volume storage container for paint that can be discarded or cleaned after use and refilled with additional paint.

In FIG. 12, a spray head 550 is shown connected to a paint reservoir 547 that can be collapsed in the form of a pouch or bag 548. As shown in FIG. The bag 548 has a screw connection 549 that is screwed into the inlet connector 541 of the spray head 550. The bag 548 may be prefilled with paint and sealed by any suitable closure system before it is necessary to mount the reservoir 542 to the spray head 550. In this way, the end user can purchase a packaged paint storage container 547 filled with paint for use with the spray head 550, and after use, the spray head 550 and storage container 547 contaminated with paint. Can be discarded to reduce the amount of cleaning of the spray gun. This arrangement is suitable for providing a stable paint under normal storage conditions before use is required. It can be made of any suitable material that is flexible and tear resistant, such as, for example, a single sheet or a duplicate sheet of metal foil or plastic.

As will be appreciated, the present invention includes a paint transfer system for a spray gun that can reduce the amount of cleaning of the spray gun upon spray completion or when changing the spray gun for spraying other liquids. Thus, it can be seen that by connecting the reservoir to the spray head, the liquid is delivered to the spray nozzle through the spray head without passing through the spray gun body. In this way, contamination of the spray gun resulting from contact with the sprayed liquid is reduced, so that cleaning of the spray gun is simplified, especially when the spray head and paint reservoir are disposable, and the amount of any solvent or other cleaner used can be reduced. .

The exemplary embodiments described herein illustrate the various scopes and applications of the invention and can be made separate or combined with other features of the same or different embodiments to make the properties of the embodiments.

In addition, while the exemplary embodiments described represent the best means known to the present applicant, the present invention is not limited thereto and various modifications and improvements can be made within the spirit and scope of the invention as generally described.

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Existing spray guns, as shown in Figures 1 and 2, can be converted for use with the spray head of the present invention. For example, the inlet of the spray gun body to be connected to the paint reservoir can be closed with a blanking plug, for example, and an adapter with a bayonet lug is screwed to the tip of the spray gun body attached to the spray head.

Other modifications and variations apparent to those skilled in the art are deemed to be within the scope of the invention as defined in the claims below.

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Claims (42)

A spray gun comprising a body having a trigger mechanism connected to the needle, a spray head including a body connected to the spray gun body at the rear end and further including a spray nozzle at the front end, and liquid from the liquid storage container being spray gun A liquid reservoir connected to the spray head body for supplying liquid to the spray nozzle in response to the trigger mechanism to be delivered to the spray nozzle through the spray head body without passing through the body and guided into the liquid dispensed from the spray nozzle. A liquid spray device comprising an air outlet arranged on opposite sides of a spray nozzle to provide an air flow, the liquid spray device comprising: The spray head body and the spray gun body have mated non-threaded formations that can be engaged to secure the spray head body to the spray gun body and can be disengaged to detach the spray head body from the spray gun body, The spray gun body is connected to the spray head body and separated from the spray head body with the trigger mechanism and needle, And an air outlet is provided on the spray head at the tip of the spray head body such that the air outlet and spray nozzle, together with the spray head body, are connected to the spray gun body and separated from the spray gun body. The liquid atomizing device of claim 1, wherein the mating formation forms a bayonet type connection. The liquid spray apparatus according to claim 1 or 2, wherein the storage container is mounted to a spray head. The liquid atomizing device of claim 1, wherein a detachable connection is provided between the reservoir and the spray head such that the reservoir is detachable from the spray head. 5. A liquid spray apparatus according to claim 4, wherein the detachable connection is a bayonet type connection. delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete

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