JPH0463746B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a spray gun that is equipped with a plurality of spray heads and can simultaneously perform a plurality of coatings of different colors or specifications.

[Prior art]

In order to enhance the appearance of a room, surfaces such as walls and ceiling panels of houses are often painted with marble patterns using multiple types of paint. In order to perform such pattern painting, conventionally, as shown in FIG. By moving the paint by a conveyor, the object to be coated e was coated one color at a time with paint discharged from independent spray guns b, c, and d.

[Problem that the invention seeks to solve]

However, in the above-mentioned painting method, each of the spray guns b, c, and d is operated independently, which tends to cause color deviations, and therefore, the finished pattern may be different from the one planned, or the spray guns may be localized. There were quality problems such as changes in the

On the other hand, as disclosed in Japanese Utility Model Publication No. 35-5470, there is also a model with three spray guns installed in parallel, but this gun sprays granular or powdered paint materials such as cork or asbestos at the same time. A gun for discharging materials and a gun for ejecting adhesive have different structures and functions, and they do not solve the problems mentioned above. It could not be adopted to solve the problem.

The present invention has a plurality of spray heads, and the paint nozzle port and the air nozzle port of each spray head are opened and closed in synchronization by operating a trigger provided on a gripping body. To provide a spray gun that can easily paint a marble pattern colored using a plurality of types of paints without causing color shift, and that can solve the above-mentioned problems.

[Means for solving problems]

The present invention provides a plurality of spray heads 5 having at their front ends a paint nozzle port 3 which is opened and closed by a needle valve 2 and can discharge paint when opened, and an air nozzle port 4 for discharging air. A gripping body 7 comprising
and the needle valve 2 is coupled to a piston 10 that slides through the airtight 9 and is retracted by the inflow of high pressure air into the air chamber 9, while the gripping body 7
a first valve body 2 which is operated by the trigger operation and which opens and closes the first air passage 11 from the high pressure air source to the air nozzle port 4; This spray gun is provided with a second valve body 14 that turns on and off a second air flow path 13 leading to the second air flow path 13.

An embodiment of the present invention will be described below based on the drawings.

In FIGS. 1 and 2, the spray gun 1 includes a grip 7 and a plurality of spray heads 5, each connected to a connecting piece 20 attached to the top of the grip 7, arranged side by side. Further, in this embodiment, an air chamber 9 is provided at the rear of the upper part of the grip 7 to accommodate a piston 10 for operating the needle valve 2 of the spray head 5.

In the gripping body 7, a horizontal hole 24 intersecting the intake hole 23 is bored at the upper end of the intake hole 23, which has an open end at the bottom thereof with a nipple 22 that can be connected to a high-pressure air source. Further, on the upper surface of the gripping body 7, there is a first guide hole 26 which communicates with the horizontal hole 24 in front of the intake hole 23, and a first guide hole 26 which is located behind the first guide hole 26 and communicates with the intake hole 2.
A second conductor 27 is bored at the rear of the hole 3 to be electrically connected to the horizontal hole 24.

Therefore, in the grip body 7, there are an intake hole 23 and a horizontal hole 2.
4. The first flow path 29 formed by the first guide hole 26, the intake hole 23, the horizontal hole 24, and the second guide hole 27
A second flow path 30 is formed. Furthermore, the first channel 29 has a first guide hole 26 and a horizontal hole 24.
The first valve body 12 is disposed at the intersection point between the second guide hole 27 and the horizontal hole 24, and the second valve body 14 is disposed at the intersection point between the second guide hole 27 and the horizontal hole 24 in the second flow path 30. Ru.

The first valve body 14 has a support fitting 33 that is screwed onto the front end of the horizontal hole 24 and has a valve seat 32 formed by a tapered hole that widens toward the rear.
and a conical valve 34 which has a shaft 35 protruding from its front portion that abuts the trigger 6 and abuts a valve seat 34. Further, the support fitting 33 is provided with a ventilation hole 36 that connects the valve seat 32 to the first guide hole 26.

The second valve body 14 is connected to the intake hole 23 of the horizontal hole 24.
A mounting bracket 4 fixed to the horizontal hole 24 at the rear and having a tapered valve seat 41 that widens toward the rear.
2, a cap body 45 that is attached to the rear end of the horizontal hole 24 and has a small hole 44 that communicates with the outside air, and a valve 46 that abuts the valve seat 41.

The valve 45 is an actuating piece that extends forward and has a gap g between its front end and the rear end of the first valve body 12 when it comes into contact with the valve seat and is arranged concentrically with the shaft rod 35. On the other hand, a protruding piece 49 is provided at the rear of the valve 46 to close the small hole 44 when the valve 46 is retracted.

Further, the first valve body 12 has a spring 51 interposed between the valve 34 and the fitting 42 of the second valve body 14, which urges the valve 34 forward, that is, in the direction toward the trigger 6. The second valve body 12 is provided with a spring 52 between the valve 46 and the cap body 45 for biasing the valve 46 toward the first valve body.

Therefore, the first and second valve bodies 12 and 14 are arranged coaxially, and when the trigger 6 is operated, the first valve body 12 connects the first flow path 29 and the second valve body. 14
can open and close the second flow path 30, respectively. Note that the valve 34 of the first valve body 12 and the actuation piece 49 of the second valve body 14
Since the above-mentioned small gap g is present between the first valve body 12 and the first valve body 12, the first valve body 12 can be opened before the second valve body is opened.

The air chamber 13 is formed by a cylindrical body 55 provided at the upper rear part of the grip body 7 . The cylindrical body 55 has a large hole 56 with a large diameter that opens at the rear surface, and a guide hole 57 with a small diameter that extends forward from the rear end of the large hole 56 and opens at the front surface of the cylindrical body 55. will be established. The opening of the large hole 56 is closed by a cap 59. The piston 10, which has a rod 61 extending forward, is housed inside the air chamber 9 so as to be slidable back and forth. Rod 61
is inserted through the sealed hole of the bush 62 fitted into the guide hole 57, and its front end protrudes from the cylindrical body 55, while the air chamber 9 is electrically connected to the second guide hole 27 at its inner part. do.

The connecting piece 20 is a T-shaped plate having wings 20b, 20b projecting in both lateral directions at the front part of a base piece 20a extending back and forth, and the gripping body 7 at the rear part of the base piece 20a. is bolted to the top of the Also, on the front upper surface of the connecting piece 20, there are a plurality of pieces, in this embodiment, three pieces.
Spray head 5... base piece 20a, wing piece 20
Each spray head 5 is fixed to the connecting piece 20 by a bolt 65 that is placed across the connecting piece 20 and inserted through the connecting piece 20 from the lower surface of the connecting piece 20.

Further, inside the connecting piece 20, by fixing the connecting piece 20 to the holding body 7, there are conductive holes 26 of the holding body 7, and branches and openings at the bottom of each spray head 5. A vent 66 is provided.

The spray head 5 includes a base body 74 having external threads 72 and 73 on the front and rear end surfaces of a prismatic body. A counterbore 76 into which the flange 75A of the paint nipple 75 is fitted is provided on the end surface of the threaded portion 72.

A guide hole 77 passes through the center of the paint nipple 75, and the paint nozzle port 3 is formed at the front end opening of the guide hole 77. Further, the rear end of the guide hole 77 opens at a paint reservoir 80 which is provided in the base body 74 and is connected to a paint tank for storing paint and communicated with the paint nip 79.

The paint nip 75 is provided with a cone-shaped valve seat behind the paint nozzle 3, and a cone portion provided at the tip of the needle valve 2 comes into contact with the valve seat.

The needle valve 2 passes through the guide hole 77 and the base body 74.
The screw portion 7 penetrates through the interior and is provided at the rear of the base body 74.
The rear part of the needle valve 3 protrudes from the needle valve 3, and a connecting rod 82 extending rearward along the axial direction of the needle valve 2 is connected to the rear end.

The connecting rod 82 is guided by the inner circumferential surface of a cylindrical body 83 that is threaded into the threaded portion 73, and the needle valve 2 can be moved back and forth by this guidance. Further, by interposing a spring 84 between the connecting rod 82 and the cylinder 83 to urge the needle valve 2 forward, the paint nozzle port 3 is normally closed by the needle valve 2.

The connecting rods 82 projecting rearward from the respective spray heads 5 are connected to each other by a connecting member 86. The connecting tool 86 connects each connecting rod 8
A connecting piece 89 having a plurality of holes 87 through which the pistons 2... are inserted, and a U-shaped actuating piece 90 arranged behind the connecting piece 89 and to which the rod 61 of the piston 10 is connected are bolted together. They are joined together by a stop or the like. Further, by screwing a nut 92 into a threaded portion 91 provided at the rear end of each connecting rod 82, each connecting rod 82 is locked to the connecting tool 86 so that it cannot fall off.

Therefore, when the second valve body 14 is opened and air enters the air chamber 9, the piston 10 is retracted, and by this retraction, the needle valves 2 provided in the respective spray heads 5 can be opened at the same time.

An air cap 96 is attached to the base body 74 using a cap nut 95 on the threaded portion 72 . There is also an air hole 9 formed in the base body 74 aligned with the air hole 66 passing through the connecting piece 20.
6 opens with a bore 99 provided in the air cap 96 and connects the bore 99 with the paint nip 7.
5. The air nozzle opening 4 is formed by the gap between the outer periphery and the outer periphery.

The air hole 96 is connected to the metering valve 10 inside the base body 74.
1 branches the sub-air hole 102 interposed therebetween, and the sub-air hole 102 passes through the inner hole 103 of the air cap 96 and communicates with the outlet 104 at its tip.

In this way, high pressure is generated by the intake hole 23, the horizontal hole 24, and the first guide hole 26 provided in the grip body 7, the ventilation hole 66 passing through the inside of the connecting piece 20, and the air hole 102 passing through the inside of the spray head 5. A first air passage 11 leading from the air source to the air nozzle port 4 is formed, and the first air passage 11 is operated by operating a trigger 6 to turn the first air passage 11 on and off. A first valve body 12 is interposed therebetween. A second air flow path 13 from the high pressure air source to the air chamber 9 is formed by the intake hole 23, the side hole 24, and the second guide hole 27, and the second air flow path 13 has a second air flow path 13 extending from the high pressure air source to the air chamber 9. A valve body 14 is interposed.

Thus, the nipple 22 is connected via a hose to a source of high pressure air, and each paint nipple 79 is connected via a hose to a paint container.

By operating the trigger 6, the shaft 3 of the first valve body 12
5 is retracted, the valve 34 is opened, and air from the high-pressure air source is passed through the first air flow path 11 and discharged from the air nozzle port 4. In addition, each spray head 5...
The air nozzle port 4 of... has the first air flow path 1
1 are branched and are electrically connected to each other, so that air can be simultaneously discharged by operating the trigger 6.

Furthermore, since there is a gap g between the valve 34 of the first valve body 12 and the actuation piece 47 of the second valve body 14, the second valve body 1
4 is placed in a closed state. By further actuating the trigger 6 and causing the valve 34 to move back and come into contact with the actuating piece 42, the second valve body 14 moves back and the valve body 14
Upon opening, the air from the high pressure source passes through the second air flow path 13 and enters the air chamber 9, causing the piston 10 to retreat.

Due to the retraction of the piston 10, its rod 61
The respective needle valves 2 . . . of each spray head 5 . As described above, the spray gun 1 of the present invention can simultaneously discharge air and paint from a plurality of spray heads 5, and can further prevent stepping by jetting air prior to discharging paint.

Note that when the valve 46 retreats, its protruding piece 49 closes the small hole 44 provided in the cap body 45, and the air chamber 9
On the other hand, when the valve 46 is closed, the small hole 46 is opened, and by opening the small hole 46, the air in the air chamber 9 is released to the outside, and the piston 10 is moved forward by the biasing force of the spring 84, and the needle valve 2 is moved forward. close. In addition, as shown in FIG.
06, the small 44 can be surely closed and the airtightness within the air chamber 9 can be improved.

Furthermore, since a nut 92 is used to connect the connecting rod 82 and the connecting tool 86, the amount of movement of each needle valve 2 can be adjusted individually for each spray head 5, and the amount of paint discharged from each spray head 5 can be adjusted. Can be controlled individually.

Further, the spray angle can be freely adjusted using the metering valve 101 of the sub-air hole 102.

〔Example〕

3 to 5 show other embodiments of the spray gun 1 of the present invention.

In this example, there is an air chamber 9 in each spray head 5...
and a plurality of spray heads 5... are placed on a connecting piece 110 which has a rectangular plate shape and is fixed to the upper surface of the gripper 7,
Each spray head 5... is fixed to a connecting piece 110 by bolting.

The grip body 7 is formed substantially the same as that shown in FIG. 1, and the first flow path 29 and the second flow path 30 are each opened at the contact surface with the connecting piece 110.

Inside the connection piece 110, the first flow path 29 is provided.
A first ventilation hole 111 connected to the second flow path 3
A second ventilation hole 112 leading to 0 is provided.
Further, the first ventilation hole 111 has a plurality of branch holes 1 which open below each spray head 5 on the downstream side thereof.
11a, 111b, and 111c are branched. Like the first ventilation hole 111, the second ventilation hole 112 also branches into a plurality of branch holes 112a, 112b, and 112c.

The spray head 5 includes a main body 111 formed substantially in the same manner as the base 74 shown in FIG. While inserting the needle valve 2 through the center of the main body 111, the main body 1
Air chamber 9 is connected to the rear from 11 through the constriction 116.
An airtight part 117 is attached to form the airtight part 117.

The airtight portion 117 is provided with the piston 10 having the above-mentioned structure, and in this embodiment, the rod of the piston 10 is formed as an integral piece coaxially connected with the shaft rod 119 of the needle valve 2.

The airtight portion 117 also has a connecting hole 120 that connects the air chamber 9 to the second ventilation hole 112 provided in the connecting valve 20.
to be drilled. In this way, the intake hole 23 of the grip body 7,
A second air flow path from the high-pressure air source to the air chamber 9 is created by the horizontal hole 24, the second guide hole 27, the second ventilation hole 112 of the connecting piece 110, and the communication hole 120 of the spray head 5. 13 can be formed, and a second valve body 14 is interposed in the second air flow path 13. Moreover, the first ventilation hole 1 of the connecting piece 110 is provided inside the main body part 115.
11 and communicating with the air nozzle port 4, the air hole 97 is connected to the first air hole 11 and communicates with the air nozzle port 4.
1 and the air nozzle port 4 from the high-pressure air source together with the intake hole 23, the horizontal hole 24, and the first guide hole 26 of the gripping body 7.
A first valve body 12 is interposed to form a first air flow path 11 communicating with the first air flow path 11 and to open and close the flow path.

Accordingly, by operating the trigger 6, the piston 10 in the air chamber 9 moves back to open the needle valve 2, thereby allowing paint to be discharged and air from the air nozzle port 4 to be injected.
Moreover, between the respective spray heads 5, the paint and air can be discharged simultaneously without any time lag.

In addition, in the present invention, the spray heads may be arranged horizontally, vertically, diagonally, or even in an annular manner, and the nozzle ports for paint and air may be arranged in an intersecting direction. The invention can be modified into various embodiments.

〔Effect of the invention〕

As mentioned above, since the spray gun of the present invention has a plurality of spray heads fixed to a gripping body equipped with a trigger, it has excellent operability and mobility. In addition, each spray head can discharge air and paint at the same time by operating a single trigger, which eliminates color shift and improves the appearance of the finished product compared to conventional spray heads that apply multiple coats individually. Moreover, the painting work becomes easy, and it can be suitably used for painting marble patterns.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a longitudinal sectional view showing another embodiment, FIG. 4 is a front view thereof, and FIG. 6 is a sectional view showing another example of the second valve body, and FIG. 7 is a line diagram showing the prior art. 2... needle valve, 3... paint nozzle port, 4... air nozzle port, 5... spray head, 6... trigger,
7... Gripping body, 9... Air chamber, 10... Piston,
11...first air flow path, 12...first valve body,
13...Second air flow path, 14...Second valve body,
g... Gap.

Claims (1)

[Scope of Claims] 1. A grip equipped with a trigger for holding a plurality of spray heads each having a paint nozzle port opened and closed by a needle valve and having a paint nozzle port for discharging paint when opened and an air nozzle port for discharging air at the front end. The needle valve is fixed to the body, and the needle valve is coupled to a piston that slides through the air chamber and is retracted by the inflow of high-pressure air into the air chamber, while the grip body is also provided with a high-pressure air source that is operated by the trigger operation. a first valve body for turning on and off a first air flow path from the air nozzle to the air nozzle port; and a second valve body for turning on and off a second air flow path from the high-pressure air source to the air chamber. A spray gun is provided. 2. The first valve body and the second valve body are coaxially arranged, with the first valve body being positioned forward, and having a gap between the first and second valve bodies when the trigger is operated. A spray gun according to claim 1.