JPH0362470B2 - - Google Patents

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, and to reduce the suction air flow rate. This invention relates to a spray gun that can also increase the amount of water.

[Conventional technology]

The spray gun uses an air opening/closing valve that opens and closes an air flow path by operating a trigger.

However, as shown in Fig. 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 the blind hole B
A valve set E, which integrates a valve box C and a valve body D, is inserted into the valve body. Note that the rear end of the valve box C is a blind hole B.
The valve body D has a valve shaft F protruding from the valve which abuts on the step and also abuts on a valve seat provided at its rear end.

In addition, as mentioned above, the valve seat is provided at the rear end of the valve box C that contacts the step, and therefore, in order to prevent interference, the diameter of the valve seat must be set smaller than the small diameter hole H at the rear of the step. However, the opening area of the valve seat is limited.

[Problem that the invention seeks to solve]

Therefore, in a spray gun with this structure,
When assembling the air on/off valve, it can only be inserted from the front of the handle A with the trigger S removed, and the trigger S must be attached and removed each time the air on/off valve is disassembled or cleaned. It is inferior in handling, such as not being able to move.

Furthermore, since the diameter of the valve seat is small, the opening area when fully opened cannot be made very large, which limits the air flow rate and reduces 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, there has been a demand for smaller guns and, therefore, for guns of the same model number to have improved spraying performance.

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. An air opening/closing valve 13 with a spring 12 provided between a valve body 10 inserted from the rear of the through hole 7 and a cap 11 that closes the rear end of the through hole 7.
It is equipped with

The spray gun body 2 has a head 23 at the front end of a body 22 that pivotally supports a trigger 21, and a handle 3 at the rear end.
The trigger 21 has a pistol shape, and the trigger 21 is
It hangs down into the space 25 between the head 23 and the handle 3, and the trigger 21 opens the paint outlet 2.
6 and the air opening/closing valve 13 which opens and closes the air passage 15 leading to the air outlet 14 are operated. The paint discharge port 26 is provided at the tip of a center hole of a paint nozzle 29 that is screwed into the head 23, and the center hole is connected to the inner hole 30 of the head 23,
A paint flow path 33 is formed through the vertical hole 31 and communicating with the nipple 32 . Further, the needle valve 27 is provided with a sleeve 3 made of, for example, fluororesin, which is arranged in parallel with the inner hole 30.
4. Seal ring 35 held by spring 38
It passes through the cavity 25 and is slidably held by a support fitting 37 provided in a hole 36 at the upper end of the handle 3 via a plunger 39. Furthermore, plunger 3
Reference numeral 9 denotes an adjustment screw 4 screwed concentrically between the rear end of the needle valve 27 and the front end of the stem, and also screwed together at the rear end of the hole 36.
It is biased forward by a spring 42 disposed between 3 and 3.

The air on/off valve 13 has the valve body 10 installed in the through hole 7 as described above.

The through hole 7 has a middle hole 52 concentrically located between a rear hole 50 whose rear end opens at a raised portion 45 formed on the upper back surface of the handle 3 and a front hole 51 which opens at the front surface of the handle 3. It is formed as a stepped hole which becomes smaller in diameter toward the rear hole 50, middle hole 52, and front hole 51. Further, the front hole 51 is also provided with a tapered step facing backward by having a small diameter at the front portion, and the through hole 7 is open 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.
The guide hole 59 is also provided with an air adjustment adjustment screw 61 having a throttle valve 60 located above the intersection with the guide hole 57.

Further, an outflow passage 5 communicating with the air discharge port 14 is opened in the middle part of the hollow hole 52 .

The outflow path 5 is configured to flow the air from an upwardly extending guide hole 63 and a circumferential groove 65 at the tip of the guide hole 64 passing through the body 22, through an air hole 66 around the paint nozzle 29, to an air cap 67. It communicates with the discharge port 14. Further, the guide hole 64 is connected to an air cap 67.
A throttle valve 71 at the tip of an adjustment screw 70 for pattern adjustment provided at the rear end of the guide hole 64 leads to a pattern hole 69 provided at a corner of the guide hole 64, and the amount of air can be adjusted 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.

The valve fitting 75, as shown enlarged in FIG.
At the rear end, the valve seat 6 expands in diameter toward the rear.
is connected to the center hole 77, and at its front end is provided a fitting portion 91 that fits into the middle hole 52 and has a spring receiver 79 around the center hole 77. In this embodiment, the center hole 77 is a hexagonal hole, and therefore, the valve seat is screwed into the valve fitting 75 by using a hexagon spanner that engages with the center hole 77.
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.
The valve stem 17 is inserted forward.

The rear hole 50 also has a cap 11 at its rear end.
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 is connected to the trigger 21
The holding metal fitting 95 protrudes toward the side and the sleeve 9
6 and a seal ring 97 consisting of an O-ring to seal the shaft. Note that the sleeve 96 is connected to the front hole 5.
It has a stepped cylindrical shape that is engaged with the tapered step with a smaller diameter toward the front of No. 1 to prevent it from coming off, and is made of fluororesin together with the seal ring 97. A spring 99 is disposed between the presser metal fitting 95 and the valve metal fitting 75, and the seal ring 97 is clamped by being biased forward. The front end of the shaft is sealed.

[Effect]

However, by operating the trigger 21, the valve stem 17
Separate the valve 16 from the valve seat 6 via the air opening/closing valve 1.
Open 3. Also, from the supply path 4 through the valve seat 6, the outflow path 5
high pressure air can be supplied to the air outlet 14,
It is discharged from the pattern holes 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 also allows the cap 1 to be
By unscrewing the valve body 10, the valve body 10 is moved backward.
It can be pulled out without removing the trigger 21. Further, the valve fitting 75 can also be removed, disassembled, and cleaned using a hexagonal wrench as described above.

In addition, the rear hole 50 of the through hole 7 can be formed to have a large diameter, so the valve seat 6 of the valve fitting 75 can be formed to have a large diameter while preventing interference between the valve 16 and the through hole 7, and the opening area can be increased. By increasing the amount of air discharged,
Improves application ability.

〔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 body, and also has a supply path for supplying high-pressure air and an outflow path leading to the air discharge port. formed through the valve seat,
In addition, a valve body with a valve that abuts the valve seat is inserted from the rear, and an air opening/closing valve is provided with a spring between it and a cap that closes the rear end of the through hole, so that the trigger cannot be removed. The air on-off valve can be assembled and disassembled, which improves ease of handling.
Since the valve body is inserted from the rear, the diameter of the rear part of the through hole can be increased, and by increasing the diameter of the valve seat and the opening area, the air flow rate can be increased, which improves the spraying ability and many other benefits. It can be effective.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
The figure 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 channel, 5...Outflow channel, 6...Valve seat, 7...Through hole, 1
0... Valve body, 11... Cap, 12... Spring,
13...Air on/off 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 At the top of the handle of a pistol-shaped spray gun body having a trigger, there is a rear hole 5 whose rear end opens at the back of the handle.
0, a front hole 51 that opens at the front of the handle and has a step facing rearward, and a middle hole 52 formed between the rear hole 50 and the front hole 51 that are concentric and face toward the front hole 51 and have a small diameter. The supply path 4 is provided with a through hole 7 consisting of a stepped hole and supplies high pressure air to the rear hole 50.
An outflow path 5 communicating with the air outlet at the tip of the spray gun main body is formed in the middle hole 52, and a stepped cylindrical sleeve 96 is provided at the front end of the front hole 51 to be prevented from slipping out forward by the step. A seal ring 97 on one side and a presser metal fitting 95 on the rear thereof are disposed, and the ring contacts the through hole 7 via a seal at the step between the rear hole 50 and the middle hole 52, and expands in diameter toward the rear. Also, a valve fitting 75 forming a valve seat 6 located between the supply path 4 and the outflow path 5, and the sleeve 9 at the front end of the valve body 16 that abuts the valve seat 6.
A valve body 1 having a valve shaft 17 that protrudes forward beyond 6
0, and springs 99 and 12 are arranged between the presser fitting 95 and the valve fitting 75 and between the valve body 10 and the cap 11 screwed into the rear hole 50.