JPS6229082Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air spray gun that atomizes paint using the force of compressed air, and more particularly to a pattern adjustment device for a spray gun that adjusts the spray pattern using air from the sides.

Generally, this type of air spray gun is adjusted by moving a valve that adjusts the amount of air to the side surface by advancing and retracting a screw to change its opening degree using a pattern adjustment knob provided at the rear. This adjustment is usually
It is configured to go from fully closed to fully open when rotated 2 to 4 times. One advantage of this is that it can be finely adjusted, but it also has drawbacks such as it takes time and effort to adjust the pattern width to the desired pattern width, resulting in poor workability and the inability to operate with one hand. The present invention is designed to facilitate this adjustment, since in practice it is sufficient to use two or at most three pattern widths, one large and one small.

In other words, the present invention replaces the troublesome process of rotating a pattern adjustment knob with a finger other than the hand holding the spray gun, by simply using the hand holding the spray gun. It can be rotated by pulling it with your finger to adjust it.

Fig. 1 shows an embodiment of the present invention, in which a spray gun 1 has an air cap at its tip, and uses compressed air ejected from the central air port 2 and side air ports 3 to atomize the paint and create a pattern. Form. The air passage 4 and the central air opening 2 are always in communication, and compressed air is injected from the air passage 4 through the air opening 6 of the paint nozzle 5 and from the central air opening 2. Pattern control valve 7
is engaged with the valve port 8 to adjust the opening degree, and the compressed air that has passed through the valve port 8 passes through the air hole 9 and is injected from the side air 3. The size of the spray pattern is adjusted by the amount of air injected from here, and when it is fully closed, it becomes a round pattern, and when it is fully open, it forms the maximum pattern width of the spray gun. The opening degree of the pattern control valve 7 is adjusted by moving a threaded portion 12 screwed into a screw 11 provided on an adjustment guide 10 at the rear of the main body 1 back and forth by rotating an external knob 13.

Since the above structure is the structure of a normal spray gun that has been generally shown in the past, a detailed explanation will be omitted.
The opening degree of the valve port 8 due to the advance and retreat of the valve is controlled by the rotation of the threaded part 13 at the rear.
The relationship between the shape of the tip of the pattern control valve 7 and the screw pitch is determined so that the valve changes from fully closed to fully open in less than 4 turns. Regarding the shape of the tip, the smaller the angle of the tapered portion 14 entering the valve port 8, the smaller the opening change ratio with respect to the operating amount.

Next, a protrusion 15 is provided on the knob to facilitate rotation adjustment. The protrusion 15 may be lever-shaped as shown in the drawing, or may be star-shaped with a plurality of protrusions. It may protrude in the axial direction as long as it is located at a certain location. In any case, the rotation can be adjusted by hooking the spray gun onto your finger while still holding it.

This allows you to change between round spraying and flat spraying with a single touch, such as when painting a narrow area such as a stick and a large flat area at the same time when operating a spray gun, allowing you to apply the appropriate coating to the item. Painting can be continued quickly and efficiently. In the case of a protrusion at only one location, it is more desirable to be able to adjust and fix the protrusion at an appropriate rotational position relative to the pattern control valve 7. As a result, two desired pattern widths can be changed at a determined position.

As described above, the present invention makes it possible to change several pattern widths with one touch within a range that does not cause any practical problems, thereby improving the operability of the spray gun, improving workability through proper use, and making effective use of paint.

[Brief explanation of the drawing]

Fig. 1 is a partial warm side view of a spray gun adopting an embodiment of the present invention, Fig. 2 is a right side view of Fig. 1,
FIG. 3 is a side view showing another embodiment of the pattern adjustment device. 3...Side air vent, 7...Pattern control valve, 13
...Operation knob, 15...protrusion.

Claims (1)

[Scope of utility model registration request] Paint is atomized using the power of compressed air.By adjusting the amount of air ejected from the side air port installed in the air cap of the air spray gun, the size of the spray pattern can be adjusted using the operating knob of the pattern control valve. In the spray gun installed above the grip of the spray gun, the pattern control valve has a protrusion on which the fingers can be caught at a location circumferentially away from the center of the rotation axis of the operating knob, and can be adjusted over the entire range with less than one rotation. A pattern adjustment device for an air spray gun, which is characterized by making it possible to.