Fluid sprinkling – spraying – and diffusing – Including supplemental gas shaping or shielding jet – Plural sets of gas jet orifices
Patent
1996-07-30
1998-09-08
Weldon, Kevin
Fluid sprinkling, spraying, and diffusing
Including supplemental gas shaping or shielding jet
Plural sets of gas jet orifices
239340, B05B 702
Patent
active
058033670
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to an improved spray gun which is light-weight and has an improved air control flow distribution to the spray nozzle.
In conventional high pressure spray guns, it is normal to increase or reduce the pressure at the horn-section of the aircap to change the spray pattern size and as a consequence the pressure in the atomizing air section at the centre of the aircap is automatically raised or lowered. To maintain this pressure relatively constant, two separate air supplies to the spray nozzle have to be regulated, as the control of air pressure in one flow path affects the air pressure of the other flow path.
To reduce atmospheric pollution, new legal requirements are in the course of implementation to restrict the air pressure in this atomising section of the aircap to 10 psi (0.7 bar).
In the applicant's GB Patent No. 2247193 there is described and claimed a spraygun comprising a body having an axis and a nozzle having a fluid orifice for discharging a fluid jet and an air cap attached to the front of the body, the air cap defining an annular orifice about the fluid nozzle for discharging atomisation air and including a pair of horns each having an orifice for discharging spreader air, means for delivering a relatively high volume flow of low pressure air to the spray gun, a baffle positioned between the barrel and the air cap, the baffle co-operating with the nozzle and the air cap to divide the delivered air between the atomisation air orifice and the spreader air orifices, a control ring positioned between the baffle and the body for rotation about an axis parallel to the body air, the control ring having a first position wherein the flow of such delivered air through the baffle to the atomisation air and spreader air orifices is unimpeded and a second position wherein the control ring obstructs the flow of the delivered air through the baffle to the spreader air orifices and wherein the nozzle includes a threaded end attached to the body to retain the baffle and the control ring on the body.
Hitherto, this problem of air flow pressure has been controlled by regulating the air pressure of the supply to the spray gun.
Another disadvantage with existing spray guns is that they are principally manufactured from metals such as aluminum, stainless steel and brass which are durable and resistant to the material, e.g., paint, being sprayed, but are relatively heavy and after continued use cause fatigue to the user. To overcome this disadvantage, it is proposed to lighten the weight of such spray guns by moulding parts of the body and handle in a light weight synthetic resinous material which is inert to the fluids to be sprayed by the gun, e.g. paint.
SUMMARY OF THE INVENTION
An aim of the present invention is to provide an improved spray gun which overcomes or mitigates the above disadvantages.
According to the present invention there is provided a spray gun comprising a diecast aluminum body, a sprayhead, nozzle and a handle made of a plastics material wherein the sprayhead is permanently joined to the body by a metal ring swaged to the gun body and the sprayhead.
Preferably the metal ring is made of stainless steel.
Conveniently, the handle is made of polybutylene teraphthalate with 10% of a polyester elastomer.
The plastics handle may include a coloured pigment to facilitate laster marking of the handle surface.
Preferably weirs are formed on a centre spine of the nozzle which co-operate with the sprayhead to baffle the flow of air through the gun.
In a preferred construction the spray gun comprises a body having a head and nozzle, weirs being formed in the head and the nozzle to baffle the flow of air through the gun to the assembly of an aircap wherein the weirs are formed by the relationship between the profile of the gun head and the external profile of the nozzle.
Preferably, the gun body is made of a die-cast aluminium and the head of a hard plastics material, the die-cast body being swaged over the outer profile of the head.
Conveniently a mouldi
REFERENCES:
patent: 2104761 (1938-01-01), Richter
patent: 3515355 (1970-06-01), Wagner
patent: 4022381 (1977-05-01), Karliner
patent: 4502629 (1985-03-01), MaGhee et al.
patent: 4537357 (1985-08-01), Culbertson et al.
patent: 4679734 (1987-07-01), Mommsen et al.
patent: 5090623 (1992-02-01), Burns et al.
patent: 5169070 (1992-12-01), Mattson
patent: 5328601 (1994-07-01), Schmidt et al.
Bate Anthony John
Edge Andrew
Heard Tony
Pettit Neville Thomas
Smith Rowland Charles
ITW Limited
Weldon Kevin
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