GB2033782A - Spraying apparatus - Google Patents

Spraying apparatus Download PDF

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Publication number
GB2033782A
GB2033782A GB7933496A GB7933496A GB2033782A GB 2033782 A GB2033782 A GB 2033782A GB 7933496 A GB7933496 A GB 7933496A GB 7933496 A GB7933496 A GB 7933496A GB 2033782 A GB2033782 A GB 2033782A
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GB
United Kingdom
Prior art keywords
container
nozzle
chamber
fluid
pressurised
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.)
Granted
Application number
GB7933496A
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GB2033782B (en
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ST LEDGER EVANS D
Original Assignee
ST LEDGER EVANS D
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 ST LEDGER EVANS D filed Critical ST LEDGER EVANS D
Priority to GB7933496A priority Critical patent/GB2033782B/en
Publication of GB2033782A publication Critical patent/GB2033782A/en
Application granted granted Critical
Publication of GB2033782B publication Critical patent/GB2033782B/en
Expired 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
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
    • B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
    • B05B7/0433—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with one inner conduit of gas surrounded by an external conduit of liquid upstream the mixing chamber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2489—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device an atomising fluid, e.g. a gas, being supplied to the discharge device
    • B05B7/2494—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device an atomising fluid, e.g. a gas, being supplied to the discharge device a liquid being supplied from a pressurized or compressible container to the discharge device

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  • Nozzles (AREA)

Abstract

A spraying apparatus including a spray gun 11 and a container 14 for containing the fluid to be sprayed, the spray gun having a chamber, a fluid inlet 32 in communication with the chamber and the container, a spray nozzle 15 communicating with the chamber and a pressurised gas inlet 21 communicating with the chamber, the gas inlet being arranged so that in use it directs a stream of pressurised gas through the spray nozzle in such a way that the chamber is evacuated, the fluid container being constructed so as to be capable of being pressurised by said pressurised gas, the container having a vent 42 to atmosphere which may be selectively opened or closed. In operation the gas supply is started, the vent 42 opened and a finger placed over the nozzle 15 so that the liquid in the container 14 is agitated; the vent is then closed, the finger remaining in place, thereby pressurising the container, so that when the finger is removed liquid is supplied both by induction and by gas pressure. <IMAGE>

Description

SPECIFICATION Spraying apparatus The present invention relates to spraying apparatus and in partiuclar to spraying apparatus for spraying a fluid containing a particulate suspension such as a protective and docorative wall finish e.g. Sandtex-Matt, Stronghold or Weathershield (all being trade names).
According to one aspect of the present invention there is provided a spraying apparatus including a spray gun and a container for containing the fluid to be sprayed, the spray gun having a chamber, a fluid inlet in communication with the chamber and the container, a spray nozzle communicating with the chamber and a pressurised gas inlet communicating with the chamber, the gas inlet being arranged so that in use it directs a stream of pressurised gas through the spray nozzle in such a way that the chamber is evacuated, the fluid container being constructed so as to be capable of being pressurised by said pressurised gas, the container having a vent to atmoshphere which may be selectively opened or closed.
According to another aspect of the invention there is provided a method of spraying using an apparatus as defined above wherein, prior to spraying, the vent is opened and the spray nozzle is closed so as to divert pressurised gas into the container so as to agitate the contents in the container, the vent is then closed so that as pressurised gas continues to enter the container the air space above the fluid is pressurised, the nozzle is then opened and spraying of the fluid is begun.
Closing of the nozzle is conveniently achieved by the operative placing a finger over the nozzle outlet. As pressure in the container falls, the operative simply closes the nozzle for a few seconds, thus diverting air into the container which serves to pressurise the air space and also agitate the fluid.
Reference is now made to the sole accompanying drawing: which is a schematic representation of apparatus according to the present invention.
The apparatus is generally shown at 10 and includes a spray gun 11 and a fluid container 14.
The spray gun is conveniently a metal casting for instance an aluminium casting and is provided with a nozzle 1 5 which is screw threadedly received in a threaded bore 1 8. A chamber 20 is provided with which the nozzle 15 communicates. A gas nozzle 21 is provided which extends into the chamber 20 with its outlet orifice spaced closely from the nozzle. The nozzle 21 communicates with a bore 25 which extends through the handle 28 of the gun. A control valve 30 is provided which communicates with the bore 25 and which is connected to a source of pressurised gas via a flexible pipe 26. Conveniently the pressurised gas is air and the source is capable of supplying at least 7 cubic feet per minute.
A fluid duct 32 is provided which communicates at one end with the chamber 20 and is connected at its other end to the container 14 via'a flexible pipe 35.
The nozzle 21 is so positioned in relation to nozzle 1 5 so that a stream of pressurised air is directed through nozzle 1 5 from nozzle 21.
Consequently the chamber 20 is evacuated causing fluid to be drawn into chamber 20 from the container 1 4.
If desired'pipe 35 could enter through the side walls of the container near to its base.
The container is made so as to withstand the pressure of the supplied pressurised igas. Conveniently, the container is made from a suitable plastics material.
The container 14 is provided with a fluid inlet 40 closed by a removable top or cap 41; removal of the top 41 enabling the container to be filled. A vent 42 is provided in the top 41, the vent having a valve 43 which is operable to close or open the vent so that the interior of the container may be pressurised or vented to atmosphere.
As will be appreciated, by opening valve 43 and closing nozzle 15, e.g. by placing a finger over its outlet orifice, pressurised air is directed from the chamber 20 via duct 32 and pipes 35 and 38 into the bottom of the container thereby agitating the contents of the container. By closing valve 43 the pressurised air will pressurise the air space above the contents of the container. Thus when nozzle 1 5 is opened (by removal of the finger) fluid enters the chamber 20 under two complementary influences, namely by virtue of evacuation of the chamber 20 and by pressurisation of the container.It has been found that such an apparatus is extremely convenient to use since it can spray a large area quickly and can maintain the pressure within the container and maintain the suspension in the fluid by a simple closing operation of the nozzle 1 5 for a few seconds.
Additionally, the simple construction of the spray gun enables it to be easily cleaned and renders it reliable in use.
It will be appreciated that the container may be either free standing or may be provided with a harness so that the operative may carry it on his back.
1. A spraying apparatus including a spray gun and a container for containing the fluid to be sprayed, the spray gun having a chamber, a fluid inlet in communication with the chamber and the container, a spray nozzle communicating with the chamber and a pressurised gas inlet communicating with the chamber, the gas inlet being arranged so that in use it
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Spraying apparatus The present invention relates to spraying apparatus and in partiuclar to spraying apparatus for spraying a fluid containing a particulate suspension such as a protective and docorative wall finish e.g. Sandtex-Matt, Stronghold or Weathershield (all being trade names). According to one aspect of the present invention there is provided a spraying apparatus including a spray gun and a container for containing the fluid to be sprayed, the spray gun having a chamber, a fluid inlet in communication with the chamber and the container, a spray nozzle communicating with the chamber and a pressurised gas inlet communicating with the chamber, the gas inlet being arranged so that in use it directs a stream of pressurised gas through the spray nozzle in such a way that the chamber is evacuated, the fluid container being constructed so as to be capable of being pressurised by said pressurised gas, the container having a vent to atmoshphere which may be selectively opened or closed. According to another aspect of the invention there is provided a method of spraying using an apparatus as defined above wherein, prior to spraying, the vent is opened and the spray nozzle is closed so as to divert pressurised gas into the container so as to agitate the contents in the container, the vent is then closed so that as pressurised gas continues to enter the container the air space above the fluid is pressurised, the nozzle is then opened and spraying of the fluid is begun. Closing of the nozzle is conveniently achieved by the operative placing a finger over the nozzle outlet. As pressure in the container falls, the operative simply closes the nozzle for a few seconds, thus diverting air into the container which serves to pressurise the air space and also agitate the fluid. Reference is now made to the sole accompanying drawing: which is a schematic representation of apparatus according to the present invention. The apparatus is generally shown at 10 and includes a spray gun 11 and a fluid container 14. The spray gun is conveniently a metal casting for instance an aluminium casting and is provided with a nozzle 1 5 which is screw threadedly received in a threaded bore 1 8. A chamber 20 is provided with which the nozzle 15 communicates. A gas nozzle 21 is provided which extends into the chamber 20 with its outlet orifice spaced closely from the nozzle. The nozzle 21 communicates with a bore 25 which extends through the handle 28 of the gun. A control valve 30 is provided which communicates with the bore 25 and which is connected to a source of pressurised gas via a flexible pipe 26. Conveniently the pressurised gas is air and the source is capable of supplying at least 7 cubic feet per minute. A fluid duct 32 is provided which communicates at one end with the chamber 20 and is connected at its other end to the container 14 via'a flexible pipe 35. The nozzle 21 is so positioned in relation to nozzle 1 5 so that a stream of pressurised air is directed through nozzle 1 5 from nozzle 21. Consequently the chamber 20 is evacuated causing fluid to be drawn into chamber 20 from the container 1 4. If desired'pipe 35 could enter through the side walls of the container near to its base. The container is made so as to withstand the pressure of the supplied pressurised igas. Conveniently, the container is made from a suitable plastics material. The container 14 is provided with a fluid inlet 40 closed by a removable top or cap 41; removal of the top 41 enabling the container to be filled. A vent 42 is provided in the top 41, the vent having a valve 43 which is operable to close or open the vent so that the interior of the container may be pressurised or vented to atmosphere. As will be appreciated, by opening valve 43 and closing nozzle 15, e.g. by placing a finger over its outlet orifice, pressurised air is directed from the chamber 20 via duct 32 and pipes 35 and 38 into the bottom of the container thereby agitating the contents of the container. By closing valve 43 the pressurised air will pressurise the air space above the contents of the container. Thus when nozzle 1 5 is opened (by removal of the finger) fluid enters the chamber 20 under two complementary influences, namely by virtue of evacuation of the chamber 20 and by pressurisation of the container.It has been found that such an apparatus is extremely convenient to use since it can spray a large area quickly and can maintain the pressure within the container and maintain the suspension in the fluid by a simple closing operation of the nozzle 1 5 for a few seconds. Additionally, the simple construction of the spray gun enables it to be easily cleaned and renders it reliable in use. It will be appreciated that the container may be either free standing or may be provided with a harness so that the operative may carry it on his back. CLAIMS
1. A spraying apparatus including a spray gun and a container for containing the fluid to be sprayed, the spray gun having a chamber, a fluid inlet in communication with the chamber and the container, a spray nozzle communicating with the chamber and a pressurised gas inlet communicating with the chamber, the gas inlet being arranged so that in use it directs a stream of pressurised gas through the spray nozzle in such a way that the chamber is evacuated, the fluid container being constructed so as to be capable of being pressurised by said pressurised gas, the container having a vent to atmosphere which may be selectively opened or closed.
2. A spraying apparatus according to claim 1 wherein the spray nozzle is movably mounted in the spray gun.
3. A spraying apparatus according to claim 1 or 2 wherein the container is made from a suitable plastics material.
4. A spraying apparatus according to claim 1, 2 or 3 wherein the container is provided with a removable cap and the vent is mounted on the cap.
5. A spraying apparatus substantially as described with reference to and as illustrated in the accompanying drawing.
6. A method of spraying using an apparatus according to any preceding claim wherein, prior to spraying, the vent is opened and the spray nozzle is closed so as to divert pressurised gas into the container so as to agitate the contents in the container, the vent is then closed so that as pressurised gas continues to enter the container the air space above the fluid is pressurised, the nozzle is then opened and spraying of the fluid is begun.
GB7933496A 1978-10-05 1979-09-27 Spraying apparatus Expired GB2033782B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7933496A GB2033782B (en) 1978-10-05 1979-09-27 Spraying apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7839364 1978-10-05
GB7933496A GB2033782B (en) 1978-10-05 1979-09-27 Spraying apparatus

Publications (2)

Publication Number Publication Date
GB2033782A true GB2033782A (en) 1980-05-29
GB2033782B GB2033782B (en) 1982-09-02

Family

ID=26269082

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7933496A Expired GB2033782B (en) 1978-10-05 1979-09-27 Spraying apparatus

Country Status (1)

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GB (1) GB2033782B (en)

Also Published As

Publication number Publication date
GB2033782B (en) 1982-09-02

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PCNP Patent ceased through non-payment of renewal fee