JPS6268562A - Spray gun - Google Patents

Abstract

PURPOSE:To perform disassembly and assembly without detaching a trigger and to increase the caliber of a valve seat, by providing a through-hole opened at the front and rear ends thereof to the upper part of the handle of a spray gun main body in a pierced state and making it possible to insert an air opening/closing valve assemblage in said through-hole from the rear end thereof. CONSTITUTION:When a valve 16 is separated from a valve set 6 through a valve stem 17 be operating a triiger 21 to open an air opening/closing valve 13, high pressure air can be supplied to an outflow passage 5 from a supply passage 4 through the valve seat 6 and emitted from an air emitting port 14 and a pattern hole 69. When the trigger 21 is further pulled, a needle valve 27 opens the paint emitting port 26 of a point flow passage 33 to atomize and inject paint. Herein, a through-hole 7 is opened at the front and rear ends thereof at the upper part of the handle 3 and, by detaching cap 11 by screwing the same, a valve body 10 can be drawn out rearwardly without detaching the trigger 21. Because the rear hole 0 o the through-hole 7 can be formed into a large diameter, the caliber of the valve seat 6 of a valve metal fitting can be enlarged and the flow amount of air can be increased.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention improves ease of disassembling and assembling the gun by making it possible to insert and remove the valve body of the air on-off valve from the rear. This invention relates to a spray gun that can also increase the flow rate.

[Conventional technology]

The spray gun uses an air opening/closing valve that opens and closes an air flow path by triggering the gun.

However, as shown in Figure 3, the conventional air on/off valve has a stepped blind hole B that opens on the trigger S side in the upper part of the handle A of the spray gun body, and a valve box in the cough blind hole B. A valve set E, which integrates C and a valve body, is inserted. The rear end of the valve box C abuts the step of the blind hole B, and the valve body has a valve shaft F projecting from the valve that abuts a valve seat provided at the rear end.

Also, as mentioned above, the valve seat is provided at the rear end of the valve box C that comes into contact with the step, so in order to prevent interference, the step! ! As a result of setting the diameter of the valve seat to be smaller than the rear small diameter hole H, the opening area of the valve seat is limited.

[Problem that the invention seeks to solve]

Therefore, in a spray gun with such a structure, when installing the air on-off valve, it can only be inserted from the front of the handle A, and therefore with the trigger S removed, and when disassembling and cleaning the air on-off valve, Handling is poor, as the trigger S must be attached and detached each time.

Also, since the diameter of the valve seat is small, the opening area when fully open cannot be made very large, which limits the air flow rate.
Decreases the spraying ability of the spray gun. Moreover, the blind hole B also makes the drilling operation difficult.

On the other hand, in recent years, guns have become smaller, so guns of the same model number are
There is a need to improve the ability of spraying.

The present invention is based on providing a handle with a through hole that is open from the front and back and making it possible to insert the valve body from the rear.The present invention improves the ease of assembly of the air on-off valve, facilitates disassembly and cleaning, and improves the air flow rate. The object of the present invention is to provide a spray gun which can solve the above-mentioned problems.

[Means for solving problems]

Hereinafter, one embodiment of the means of the present invention capable of achieving the above-mentioned objects and solving the problems will be described with reference to the drawings.

In the figure, the spray gun 1 has a through hole 7 that is open at the front and back and that has a supply path 4 and an outflow path 5 interposed through a valve seat 6 in the upper part of the handle 3 of the spray gun body 2. The valve body 10 inserted from the rear of the through hole 7 and the through hole 7
It has an air opening/closing valve 13 with a spring 12 between it and a cap 11 that closes the rear end.

The spray gun main body 2 has a pistol shape, with a head 23 formed at the front end of a body 22 that pivotally supports a trigger 21, and the handle 3 formed at the rear end. Handle 3
A needle valve 27 that hangs down in a space 25 between the air outlet 25 and the trigger 21 opens and closes the paint outlet 26, and the air opening/closing valve 13 that opens and closes the air passage 15 leading to the air outlet 14. make it work. The paint discharge port 26 is provided at the tip of the center hole of the paint nozzle 29 that fits into the head 23, and the center hole passes through the inner hole 30 and vertical hole 31 of the head 23 and into the nipple 32. A communicating paint flow path 33 is formed. The needle valve 27 passes through the cavity 25 through a sleeve 34 made of, for example, fluororesin, which is arranged in parallel with the inner hole 30, and a seal ring 35 held by a screw 38, and through the hole at the upper end of the handle 3. It is slidably held by a support fitting 37 provided at 36 via a plunger 39 . Note that the plunger 39 is
The rear end of the needle valve 27 and the front end of the stem are screwed together concentrically, and the spring 42 is biased forward by a spring 42 disposed between an mrI screw 43 that fits at the rear end of the hole 36.

As mentioned above, the air on-off valve 13 has the valve body 10 inside the through hole 7.
Install.

The through hole 7 is formed by a raised portion 45 formed on the upper back surface of the handle 3.
A middle hole 52 is formed concentrically between a rear hole 50 that opens at the rear end and a front hole 51 that opens at the front surface of the handle 3, and extends toward the rear hole 50, the middle hole 52, and the front hole 51. Each hole is formed as a stepped hole with a smaller diameter. Further, the front hole 51 is also provided with a tapered step having a smaller diameter at the front portion, and the through hole 7 is opened at the front and rear thereof.

Further, the rear hole 50 is provided with a screw hole except for the centering portion 54 at the front end, and the supply path 4 of the air flow path 15 opens at an intermediate position in the rear hole 50. The supply path 4 includes a guide hole 57 that intersects with the nipple 56 at the lower end of the handle, and a guide hole 59 that diagonally communicates with the rear hole 50 at the upper end of the guide hole 57.
Further, the guide hole 59 is provided with an adjustment screw 61 for air adjustment having a throttle valve 60 located above the intersection with the guide hole 57.

In addition, the air discharge port 1 is provided in the middle part of the hollow hole 52.
4 is open.

The outflow path 5 is connected to the air outlet provided in the air cap 67 through an upwardly extending guide hole 63 and a circumference R165 at the tip of the guide hole 64 passing through the body 22, through an air hole 66 around the paint nozzle 29. It leads to exit 14. Also, the guide hole 64
is connected to the pattern hole 69 provided at the corner of the air cap 67, and the pattern m provided at the rear end of the guide hole 64.
The amount of air can be adjusted by the throttle valve 71 at the tip of the knot adjusting screw 70 as the screw advances and retreats.

A valve fitting 75 is screwed into the through hole 7 via a seal at the step between the rear hole 50 and the middle hole 52.

As shown in an enlarged view in FIG. 2, the valve fitting 75 has, at its rear end, the valve seat 6 whose diameter expands toward the rear connected to the center hole 77, and at its front end, which is connected to the center hole 52. A fitting part 91 that fits together and has a spring receiver 79 around the center hole 77
has been established. In this embodiment, the center hole 77 is formed of a hexagonal hole, and therefore, the valve seat is screwed into the center hole 77 using a hexagonal wrench that engages with the valve fitting 75.
A valve seat 6 may be interposed between the supply path 4 and the outflow path 5.

The valve body 10 is provided with a valve shaft 17 protruding from the through hole 7 at the front end of the valve 16 that contacts the valve seat 6. 17 is inserted before.

A cap 11 is attached to the rear end of the rear hole 50, and a spring 12 is interposed between the cap 11 and the valve body 10 to urge the valve body 10 forward.

Note that one end of the spring 12 is fixed in advance by the protrusion at the rear end of the valve 16. The valve body 10 is also urged forward by a spring 12. Further, the valve stem 17 protrudes toward the trigger 21 and is sealed using a locking fitting 95, a sleeve 96, and a seal ring 97 consisting of an O-ring. Furthermore, sleeve 96
has a stepped cylindrical shape that fits into the tapered step of the front hole 51 that becomes smaller in diameter toward the front, and is made of fluororesin together with the seal ring 97. A spring 99 is disposed between the retainer fitting 95 and the valve fitting 75, and the sealing ring 97 is clamped by being biased forward. The shaft is sealed.

[Effect]

By operating the trigger 21, the valve 16 is separated from the valve seat 6 via the valve shaft 17, the air opening/closing valve 13 is opened, and high pressure air is supplied from the supply path 4 through the valve seat 6 to the outflow path 5. The air is discharged from the air discharge port 14 and the pattern hole 69. By further pulling the trigger 21, the needle valve 27 opens the paint discharge port 26 of the paint flow path 33, and the paint can be atomized and sprayed.

The through hole 7 is opened in the front and back at the upper part of the handle 3, which facilitates its processing, and by twisting the cap 11, the valve body 10 can be pulled out backwards without removing the trigger 21. . Further, the valve fitting 75 can also be removed, disassembled, and cleaned using a hexagonal wrench as described above.

Further, the rear hole 50 of the through hole 7 can be formed to have a large diameter, so that the valve seat 6 of the valve fitting 75 can prevent interference between the valve 16 and the through hole 7, and
The aperture can be made large, and by increasing the opening area, the amount of discharged air is increased and the application ability is improved.

〔Effect of the invention〕

In this way, the spray gun of the present invention has a through hole that is open at the front and back in the upper part of the handle of the spray gun main body, and
A supply path for high-pressure air supply and an outflow path leading to an air discharge port are formed through a valve seat, and a valve body having a valve that abuts the valve seat is inserted from the rear, and the rear end of the through hole is It is equipped with an air on/off valve with a spring between it and the cap that closes it.
Therefore, the air on-off valve can be assembled and disassembled without removing the trigger, which improves the ease of handling, and since the valve body is inserted from the rear, the diameter of the rear part of the through hole can be increased, and the diameter of the valve seat can be increased. By increasing the opening area, the air flow rate can be increased, and spraying can have many effects, such as improving the ability.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, FIG. 2 is a perspective view illustrating a valve fitting, and FIG. 3 is a sectional view illustrating a conventional spray gun. 2--spray gun, 3-handle, 4--supply path,
5...-Nagareyamaji, 6-Valve seat, 7-Through hole, 10...
Valve body, 11--cap, 12-spring, 13
-Air opening/closing valve, 14-Air discharge port, 15-Air flow path, 16--Valve, 17--Valve shaft, 27--
Needle valve, 34.--Sleeve, 35.--Seal ring.

Claims (1)

[Claims] (1) A valve seat on the top of the handle of a pistol-shaped spray gun body with a trigger, which is open at the front and back and has a supply path for supplying high-pressure air and an outflow path leading to the air outlet at the tip of the spray gun body facing rearward. The valve shaft is provided with a valve that abuts the valve seat at the rear end of the valve shaft that extends forward, is sealed from the front end of the through hole, and protrudes from the front end of the through hole, and extends from the rear of the through hole. An air opening/closing valve is provided with a spring that biases the valve body forward between a valve body inserted into the through hole and a cap that is screwed onto the rear end of the through hole and closes the rear end of the through hole. A spray gun that comes with it.