Fluid sprinkling – spraying – and diffusing – With heating or cooling means for the system or system fluid – Spray terminal carrying member carriers heater
Patent
1981-08-12
1983-07-26
Love, John J.
Fluid sprinkling, spraying, and diffusing
With heating or cooling means for the system or system fluid
Spray terminal carrying member carriers heater
239397, B05B 124
Patent
active
043949673
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The present invention generally relates to paint guns and more particularly relates to a gun for the hot application of paints. It is known that the hot application of paints by means of a gun has very many and very important advantages over the conventional cold application of paints by means of a gun.
Different types of devices are known which are adaptable on guns for the hot application of paints which comprise heating means, usually electric heating resistances adapted to heat the paint and the spraying air for the latter.
There is described in French patent No. 79 05318 in the name of the Applicant a gun for the hot application of paints comprising a heating block containing electric resistances and enclosed in an envelope in which circulates the air for spraying the paint, this envelope being itself enclosed in the pot containing the paint which is adapted to be supplied directly to the gun by the effect of gravity.
This device is not completely satisfactory owing to the fact that it has a tendency to heat the whole of the paint contained in the pot. Consequently, the paint takes a very long time to heat up and its temperature is not uniform.
As the conventional guns are of metal which is a good conductor of heat, the grip of the gun very rapidly heats up and this renders its handling difficult for the operator. Further, in order to remove the spray head of conventional guns, a tool must be employed for unscrewing the screwthreaded ring which immobilises the nozzle the flanges of which comprise the air jets. Metal guns easily withstand the sometimes considerable forces which may be applied by means of this tool and which could not be supported by a gun made from a more fragile heat insulating material.
An object of the invention is to overcome these drawbacks and to provide a gun for the hot spraying of paints comprising an incorporated heating device made from a material which is a poor conductor of heat the air nozzle of which may be adjusted angularly without use of a tool and in which the volume of the heated paint is reduced to the minimum required amount.
Another object of the invention is to provide a gun for the hot spraying of modern paints which is antideflagrating and thus presents all the guaranties of safety.
The invention consequently provides a gun for the hot application of paints of the type comprising an assembly fixed to the body of the gun comprising a heating block including electric resistances disposed in a housing in which the spraying air circulates in contact with said block, said housing being in contact with the paint, characterised in that the gun comprises a first sinuous path for the air formed partly within said heating block and partly between said block and the inner surface of a first envelope, and a second sinuous path for the pain defined between the outer surface of said first envelope and a second envelope, said assembly being fixed to a gun body of insulating material having a rotary spraying head including two pairs of air jets at least one of which pairs is adjustable and in that it comprises automatic temperature regulating means controlled by the spraying air.
According to another feature of the invention, said first sinuous path for the air and said second sinuous path for the paint each comprise an outlet part extending through said heating block.
Preferably, said outlet parts are adjacent.
In a preferred embodiment, said outlet parts are concentric.
According to another feature of the invention, the total volume of the path for the paint and the total volume of the path for the spraying air are each adapted to permit, within a given period of time, flows of paint and air which respectively slightly exceed the flows of the paint and air of the gun in operation.
It will be understood that owing to this arrangement, the device according to the invention only heats at each instant the volumes of paint and air which are just a little greater than those supplied within the same period of time by the spraying head.
According to yet another feature
REFERENCES:
patent: 2976392 (1961-03-01), Wabnitz
patent: 3219274 (1965-11-01), Roche
Love John J.
Rastello Jon M.
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