JPH0734880B2 - Painting gun - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a painting gun that is used by hand when painting a car or a wall surface.

[0002]

2. Description of the Related Art A coating gun as shown in FIG. 5 is well known and has the following construction. That is, 1 is a grip portion, 2 is an operation portion, and 3 is a nozzle portion, and the grip portion 1
Is provided with a compressed air intake 4, a trigger adjusting knob 5 and a compressed air adjusting knob 6, a trigger 7 is provided in the operating portion 2, and a coating liquid container 8 and a coating liquid passage 9a are provided in the nozzle portion 3.
And 9b, a needle valve shaft 10a forming the tip of the sliding shaft 10 displaced by the trigger 7, a nozzle 11 into which the valve shaft 10a is inserted, and a cap 1 for covering the front surface of the nozzle 11.
2 and a cap nut 13 for fixing the cap 12 are provided. At this time, 14 is an air ejection hole, 1
5 is a nozzle hole opened and closed at the tip of the needle valve shaft 10a,
Reference numeral 16 is a hole for spraying the coating liquid in a mist state by the air jetted from the hole 11, and 17 is air for letting out the air for appropriately spraying the coating liquid sprayed through the hole 16. It is a spout.

In the above coating gun, the compressed air intake port 4
When the trigger 7 is pulled while the coating liquid container 8 is filled with the coating liquid by connecting the air supply hose to the compressed liquid, the compressed air is discharged from the hole 14 of the nozzle 11 through the required passage and the cap 1
2 is ejected from the hole 16 and the coating liquid is caused by the suction effect of the air ejected from the hole 16 to the coating liquid passage 9
A, 9b, and a passage that forms the periphery of the needle valve shaft 10a in the nozzle 11, reach the nozzle hole 15, and are atomized from there. At this time, the sprayed state of the coating liquid is adjusted by operating the compressed air knob 6 to adjust the air flow rate, or by operating the trigger adjustment knob 5 to change the relative position between the nozzle hole 15 and the needle valve shaft 11. Can be subtly changed, which is extremely important for highly precise coating. On the other hand, when the trigger 7 is returned, the nozzle hole 15 is closed at the tip of the needle valve shaft 11 and the ejection of the coating liquid is immediately stopped.

[0004]

In the conventional coating gun described above, after using the gun, the cap nut 13, the cap 12 and the nozzle 11 are removed as shown in FIG. In addition to each part, the inner surface of the coating liquid container 2 and the coating liquid passages 9a and 9b must be cleaned with thinner, but this work is troublesome and there is a problem that the organic solvent in the coating liquid may harm your health. However, in order to solve this problem, the coating gun of JP-A-3-30852 has been proposed. However, in this one, a needle valve shaft for opening and closing the tip hole of the nozzle is not provided, and instead, the middle of the coating liquid passage on the upstream side of the nozzle is throttled and closed. . For this reason, the spray state cannot be finely adjusted by changing the relative position between the needle valve shaft and the nozzle, and even if the coating liquid passage is closed, the coating liquid remains in the coating liquid passage from this position to the nozzle tip. Since this may cause drooping and damage the painted surface, it is difficult to perform advanced and rigorous processing. In view of such circumstances, an object of the present invention is to provide a coating gun which can reduce the time and effort required for cleaning after use and can perform highly precise coating.

[0005]

To achieve the above object, according to an aspect of the present invention provides a synthetic resin nozzle provided with the needle valve shaft which allowed to form an opening and closing valve on the tip, coating solution passage leading thereto
That there is so to Do disposable article of removable unitary construction from gun body, front to the fixing portion with the cap nut of the gun body
Tighten made the wood detachably other forming and allow removal of the nozzle through which is provided with connection means for making a sliding shaft which is displaced in conjunction with the valve shaft and trigger of the nozzle freely separation operation, At this time, the connecting means comprises a collet which holds the end of the valve shaft and an operation handle mechanism for tightening and loosening the collet .

[0006]

After the use of the coating gun, an integral disposable item including the nozzle and the coating liquid passage is removed from the gun body and discarded, and a new disposable item is attached to the gun body when it is used again. For this reason, the interior of the coating gun does not come into direct contact with the coating liquid, so that it does not become dirty and the labor of cleaning is significantly reduced, and the hands when throwing away do not become dirty. Further, since the coating gun is equipped with a needle valve shaft for forming an opening / closing valve at the nozzle tip as in the conventional case, the spray state of the coating liquid can be freely adjusted by the relative displacement of the nozzle and the needle valve shaft, and the opening / closing valve When it is closed, the coating liquid is immediately shut off, so that the coating liquid does not drip behind, which enables highly precise coating.

[0007]

1 to 4 relate to the present invention, FIG. 1 is a view showing a state in which a disposable item is replaced, FIG. 2 is a view showing a collet, FIG. 3 is a sectional view of a nozzle portion of a coating gun, FIG. 4 is a view showing the coating gun in an assembled state. In each figure, parts corresponding to those of the conventional example are designated by the same reference numerals.

According to the present invention, the nozzle equipped with the needle valve shaft for forming the opening / closing valve at the tip and the coating liquid passage of the gun body are formed as a single-use disposable item which can be detached from the gun body. Specifically, this is done as follows. That is, the nozzle 11 forms a cylindrical body portion 11a having a through hole p1 through which air circulates in the thick portion, and the front surface of the cylindrical body portion 11a is covered with the recessed portion a formed therein. The cap 12 is adhesively fixed, and the needle valve shaft 10a, to which the piston 18 is fixed, which is fitted in the inner hole of the cylindrical portion 11a in a liquid-tight state, is provided. At this time, the needle valve shaft 10a is not provided with an overhanging rod s1, a contact surface s2, a piston locking step s3, and the piston 1
8 is provided with O-rings r1 and r2 for maintaining liquid-tightness, and an O-ring r3 for maintaining air-tightness is provided on the outer circumference of the cylindrical portion 11a. Further, each part of the nozzle 11 uses a material suitable for being disposable, and is made of, for example, a synthetic resin. Therefore, the nozzle 11 is integrally provided with a branch pipe 11b as a coating liquid passage which replaces the conventional coating liquid passages 9a and 9b shown in FIG.

On the other hand, an insertion chamber 19 for accommodating the nozzle 11 is formed in the nozzle portion 3 of the gun body, and a fastening bolt 20 for fixing the nozzle 11 inserted therein is screwed. Tightening bolt 20
Is adapted to engage with a locking recess h provided on the outer periphery of the cylindrical portion 11a of the nozzle 11, and an O-ring r4 for maintaining airtightness is provided on the inner peripheral surface of the insertion chamber 19 together with this. A ring-shaped recess 19a communicating with the starting end opening of the air hole p1 is provided at an intermediate portion between the ring r4 and the ring r3, and the ring-shaped recess 19a is communicated with the air intake port 4 through a passage (not shown). Eggplant

13A is a nozzle 1 inserted in the insertion chamber 19.
A fixing member with a cap nut for positioning 1,
A ring member 21 is formed around which a locking ring 2 is formed.
The cap nut 22 is rotatably disengaged via the 2a, and the wing member 23 provided with the air ejection holes 17 is fixed to the front surface of the ring member 21, and the ring member 21 and the wing member 23 are required. A notch k for arranging the branch pipe 11b is provided at the position, and the branch pipe 11b is screwed to the tip of the gun body through a cap nut 22. At this time, the air ejection holes 17 are formed by the air holes p2 and the ring member 2 on the gun body side.
1 and the air holes p3 and p4 of the blade member 23 and the ring groove p5
The air hole 17 can be communicated with the air intake port 4 via the through hole, and the flow cross section of the air hole 17 can be changed by the throttle adjusting knob 24 screwed to the nozzle portion 3.

A connecting means 25 for connecting the valve shaft 10a forming an on-off valve on the inner side of the nozzle 11 and the sliding shaft 10 which is displaced in conjunction with the trigger 7 in a separable manner. Is specifically provided as follows. That is, the stepped guide cylinder 26 is fixed to the inner part of the insertion chamber 19, and the guide cylinder 26 is the cylinder body portion 1 of the nozzle 11.
The small diameter portion 26a is fitted in the inner hole of 1a and the large diameter portion 26b is fixed to the gun body. A hole p6 having a hexagonal cross section is provided inside the large diameter portion 26b. A washer 27 and a nut-shaped collet clamp 28 having a hexagonal outer cross-section are fitted in the hole p6 in a rotationally locked state, and the clamp 28 is attached to the sliding shaft 10 by a bolt. The fixed collet push 29 is screwed, and the collet push 29 is divided into four as shown in FIG. The needle valve shaft 10a is arranged and the rear end of the needle valve shaft 10a is inserted into the inner hole. 2
Reference numeral 9a is a handle for operating the collet push 29 around the sliding shaft 10.

On the other hand, the coating liquid container 8 is not provided with the conventional coating liquid passage 9a leading to the gun body (see FIG. 5), and the body is roughly halved so that one is opened and closed about the vertical axis. It is used as the door 8a and is used only for supporting the coating solution supply bag 31 made of a synthetic resin which is separately formed as a disposable item. Reference numeral 31a is a synthetic resin pipe forming a coating liquid passage for guiding the coating liquid in the coating liquid supply bag 31 to the nozzle 11, and m is a locking piece fixed to the door 8a for locking the opening of the door 8a. belongs to.

An example of using the product of the present invention configured as described above will be described. In use, the air supply hose is connected to the air intake 4, while the cap nut-attached fixing member 22 is detached to mount the nozzle 11 in the insertion chamber 19 and the rear end of the needle valve shaft 10a to the collet 30. The handle 29a is rotated, for example, by inserting the trigger 7 into the inner hole and slightly pulling the trigger 7. As a result, the collet clamp 28 screwed into the collet pusher 29 is displaced by the screw action to the side where the tapered portion 30a of the collet 30 is clamped, and the needle valve shaft 10a and the sliding shaft 10 are collet 30 and the collet clamp. 28 and collet push 29
It is firmly connected via. Further, the door 8a is opened inside the coating liquid container 8 and the coating liquid supply bag 31 is put therein, and the synthetic resin pipe 3
The tip of 1a is connected to the branch pipe 11b of the nozzle 11, and then the coating liquid is supplied to the inside of the coating liquid supply bag 31 from above, and the trigger adjusting knob 5 is operated as necessary to trigger the trigger. The relationship between the displacement of No. 7 and the operation of the opening / closing valve at the tip of the nozzle 11 is adjusted, and the supply amount of air is adjusted. After this,
The worker carries out the required painting work, and since the nozzle 11 is equipped with the needle valve shaft 10a, a very accurate and good spray can be formed in relation to the operation amount of the trigger 7. Further, the on-off valve existing at the tip of the nozzle 11 immediately shuts off the spray of the coating liquid when the trigger 7 is in the non-operated state, so that the coating liquid existing in the coating liquid passage 11b or the cylindrical portion 11a drips back. This will prevent damage to the painted surface. After the work is completed, the cap nut-attached fixing member 13A is removed and the nozzle 11 is taken out of the gun body. In this case, the nozzle 1 is preferable.
The coating liquid supply bag 31 and the synthetic resin pipe 31a are removed together with the unit 1 and are directly discarded and incinerated. By doing so, the interior of the gun body will not come into direct contact with the coating liquid, and the labor for cleaning will be significantly reduced, and the coating liquid in the coating liquid passages 11a and 31a will contaminate the hands and the like. There is no such thing.

[0014]

As described above, according to the present invention, the inside of the gun body is not contaminated with the coating liquid, the labor for cleaning the gun body is remarkably reduced, and it is excellent in health. It is possible to prevent the hands and the like from getting dirty when they are removed.

[Brief description of drawings]

FIG. 1 is a diagram showing a state in which a disposable gun is exchanged, according to a coating gun of the present invention.

FIG. 2 is a view showing a collet according to the present invention.

FIG. 3 is a cross-sectional view of a nozzle portion of the coating gun according to the present invention.

FIG. 4 is a diagram showing a coating gun in an assembled state according to the present invention.

FIG. 5 is a diagram of a conventional example.

[Explanation of symbols]

 7 Trigger 10 Sliding Shaft 10a Needle Valve Shaft 11 Nozzle 11b Coating Liquid Passage 13A Fixing Member with Nut 25 Coupling Means 30 Collet

Claims (1)

[Claims] 1. The nozzle 11 is made of synthetic resin and has a through hole.
A concave portion a is formed on the front surface of the cylindrical body portion 11a provided with p1.
Then, the cap 12 is adhered and fixed so as to cover the recess a.
In addition, a piston fitted in a liquid-tight state is inserted into the inner hole of the cylindrical portion 11a.
Equipped with a needle valve shaft 10a fixed to the stone 18
Also, a branch pipe as a coating liquid passage is provided in the cylindrical portion 11a.
11b and not, while the nozzle part 3 of the gun body
Forms an insertion chamber 19 for accommodating the nozzle 11.
And tightening to fix the inserted nozzle 11.
The mounting bolt 20 is screwed, and at the back side of the nozzle 11.
Is the sliding shaft that is displaced in conjunction with the trigger 7 on the gun body side.
A connecting means 25 is provided for connecting so that they can be separated and operated.
Therefore, the connecting means 25 is provided on the inner side of the insertion chamber 19 so that the nozzle 11
Small-diameter portion 26 having a bored inner hole into which the sliding shaft 10a is fitted
a step plan consisting of a large diameter portion 26b fixed to the gun body
The inner cylinder 26 is fixed, while the inner diameter of the large diameter portion 26b is 6
A square hole p6 is provided, and a washer 27 is provided inside the hole p6.
And turn the nut-type collet clamp 28 with an external hexagonal shape.
The clamp 2 is fitted and inserted in a state in which the rolling displacement is locked.
The sliding shaft 10 which is slid by the operation of the trigger 7 is fixed to
The collet push 29 is screwed, and the collet push 29
Inside, a collet 30 is placed in contact with the clamp 28.
In addition, the collet pusher 29 has a clamp 2
8 is the operation handle that clamps the collet 30.
On the other hand, the tip of the nozzle part 3 is inserted into the insertion chamber 19.
Fixing member with cap nut for positioning the nozzle 11
A painting gun characterized by being attached and detached freely.