Fluid sprinkling – spraying – and diffusing – Rigid fluid confining distributor – Assembly or disassembly feature
Patent
1991-06-13
1993-11-09
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Rigid fluid confining distributor
Assembly or disassembly feature
403376, B05B 1508
Patent
active
052595587
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an indexing air cap for automatic sprayguns.
BACKGROUND ART
Automatic sprayguns are increasingly being used in spray booths to spray e.g. paint on the bodywork of motor vehicles. The accuracy of mounting the spraygun on a robot has become critical as the center of the area to be sprayed must be located within 2 mm to 5 mm of the center axis of the spraygun nozzle when repositioning the spraygun.
Existing automatic sprayguns have the disadvantage that when the air cap is removed, replacement can cause the center of the spray pattern to diverge from its previous center point resulting in an uneven disposition of material known as "banding" when the gun follows the predetermined movement path of a machine or robot.
Manually operated sprayguns do not have the same disadvantage as the positioning of the spraygun is made by the eye of an experienced operator which prevents this problem.
An aim of the present invention is to overcome or mitigate the above mentioned disadvantage of automatic sprayguns.
DISCLOSURE OF INVENTION
According to one aspect of the present invention there is provided an automatic spraygun comprising an air cap adjustably secured on the sprayhead of the automatic spraygun, a baffle located on the body of the spraygun and a seal of low density plastics material located between the baffle and the body, wherein the air cap is located in angular increments relative to the spraygun ensuring replacement within accurately predetermined limits.
Preferably the air cap is located in angular increments of 90.degree..
In a preferred construction the seal is made of polyethylene and has inner and outer sealing beads.
According to a second aspect of the present invention there is provided an automatic spraygun with a centrally located aperture passing laterally of the longitudinal axis of the spraygun, a mounting stud passing through the aperture and extending from each side of the spraygun to engage apertures in a mounting fixture, wherein the mounting stud has at least two collars located on a screw-threaded bolt, a plurality of beveled washers being interposed between the collars such that tightening of the screw-threaded bolt expands the washers within the aperture to adjustably secure the mounting stud to the spraygun.
Conveniently, there are three collars on the screw threaded bolt with two sets of beveled washers between two outer collars and a central collar.
Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a longitudinal cross-section of an automatic spraygun according to the present invention, but having the air cap removed;
FIG. 2 is a fragmentary axial cross-section of an air cap and indexing assembly on an enlarged scale;
FIG. 3 is a front elevation of the seal;
FIG. 4 is an axial section of the seal taken along in line 4--4 in FIG. 3; and
FIG. 5 is a section taken along the line 5--5 of FIG. 1 with the addition of the mounting stud and mounting fixture.
BEST MODE FOR CARRYING OUT THE INVENTION
The spraygun illustrated in FIG. 1 comprises a body 1 within which are mounted conventional mechanisms as described in our co-pending Application No. 8914130.3 to control the flow of air to a nozzle 2. The fluid to be sprayed via the nozzle is metered by a needle 3 the fine adjustment of which is controlled by the control knob 4. Air is supplied to the gun via the inlet 5 passing along a series of passages within the gun body to an air cap 8 (shown in FIG. 2). The control mechanism operating the needle 3 is sealed from the air flow path by `Shamban` double delta seals 6 and is urged to the forward position by stainless steel helical springs 7 and 7'.
The air cap indexing assembly according to the present invention is shown on an enlarged scale in FIGS. 2 to 4 and comprises an air cap 8 (see FIG. 2) mounted to rotate on the spraygun body 1 having a recess 9.
A baffle 10 made of metal axially aligned and nonrotatable
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Bate Anthony J.
Smith Rowland C.
ITW Limited
Kashnikow Andres
Weldon Kevin P.
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