JPH07251102A - Pressurized container for spray gun and spray gun unit - Google Patents

Abstract

PURPOSE:To send a coating compound under pressure before a container is sufficiently pressurized. CONSTITUTION:A check valve 130 as a membranous member elastically deformable in the region expanding along the inner face of a container is arranged at the end of the compressed air inlet part 123 of the container to control only the inward introducing direction of the compressed air flow. Consequently, the pressurization of the container is kept even if a trigger 28 is released, provided that the container is pressurized once. When the use of a spray gun is started, a time lag is eliminated from the time when the trigger 28 is pulled until the coating compound is injected, and the operability of a spray gun unit is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure container for a spray gun and a spray gun unit.

[0002]

2. Description of the Related Art A pressure container attached to a spray gun pressurizes the interior of the container in response to the introduction of compressed air to pump the stored paint. It is applied when the suction force of the paint generated by the injection of air is insufficient due to the operating air pressure or the viscosity of the paint. The compressed air is introduced into the pressurized container page (2) conventionally by branching the compressed air passage to the tip of the spray gun and communicating the branch passage with the inside of the pressurized container. is there.

[0003]

In such a structure, when the operation of the spray gun is turned off, that is, when the operation of the trigger is released and the supply of the compressed air to the spray gun is cut off, the pressurized container is simultaneously pressed. The introduction of compressed air into the inside is also cut off, but at this time, the compressed air in the pressurized container will escape from the branch passage in the spray gun via the air injection port at the tip of the spray gun. Therefore, when the spray gun is restarted, the paint is not pumped until the inside of the pressurized container is sufficiently pressurized by the introduction of compressed air, that is, from the time when the trigger operation is started until the paint is sprayed. There is a problem that a time lag occurs.

In view of the above problems, it is an object of the present invention to eliminate the time lag of spraying a paint and improve the operability of a spray gun.

[0005]

To this end, the present invention provides
The inside of the main body is pressurized in response to the introduction of compressed air from a spray gun that sprays paint, and in a pressurized container for sending the paint under pressure toward the spray gun, the flow of the compressed air is transferred to the inside of the main body. It is characterized in that it is provided with a check valve for restricting only the direction of introduction into the.

[0006] Here, the check valve is located at an end of the introduction portion of the compressed air and is elastically deformable in the form of a film member arranged in an area that extends along the inner surface of the pressurized container. Can be

Further, according to the present invention, an air passage is formed from the air valve downstream from the air valve for opening and closing the compressed air passage (3) for spraying and stopping the paint to the pressurized container. In a spray gun unit configured to pressurize the inside of the pressurizing unit to feed the paint toward an injection unit, a check valve is provided in the air passage toward the inside of the pressurized container, and when the compressed air passage is closed by the air valve, It is characterized in that the check valve is adapted to prevent the outflow of compressed air from the pressurized container.

[0008]

According to the present invention, an air passage is formed from a downstream of an air valve that opens and closes a compressed air passage for spraying and stopping paint to a pressurized container, and the inside of the pressurized container is pressurized. Since the compressed air is prevented from flowing out of the pressurized container in the configuration in which the paint is pressure-fed, the pressurized state is maintained in the pressurized container even if the operation of the spray gun is released. Next, the time lag from the start of operation until the paint is sprayed can be eliminated.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. FIG. 1 shows an embodiment of a spray gun unit equipped with a pressure container according to the present invention. Here, 1 is a spray gun body, 4 is an air cap attached to its front surface,
Reference numeral 9 is a mounting cover for fixing the air cap. The spray gun body 1 is operated according to the operation of the trigger 28.
A compressed air source (not shown) such as a compressor is supplied with compressed air through an air hose attached to an air nipple 48 at a lower end of the grip portion 30, and has an air passage 20 for guiding the compressed air to the air cap 4 side. There is. The air passage 20
Communicates with an air passage 22 for introducing compressed air to the central air hole 4C of the air cap 4 and an air passage 2 for introducing compressed air to the side air hole 4S.

The air cap 4 includes air passages 22 and 2
Compressed air is supplied from the engine and the compressed air is injected from the air holes 4C and 4S of page (4).
Here, the central air hole 4C has a function of creating a vacuum state for winding up the pressure-fed paint, and is positioned concentrically with the tip of the paint nozzle. The side surface air holes 4S are respectively provided on the inner side surfaces of a pair of corners projecting from the air cap 4, and are provided for forming an elliptical pattern by the air ejected from the corners. Reference numeral 35 is a needle valve that is connected to the trigger 28 and that can open and close the paint nozzle at the tip of the spray gun according to the operation and release of the operation. An air valve 37 is attached to the needle valve 35 and opens and closes the air passage in accordance with the operation and release of the operation of the trigger 28.

100 is a paint passage 40 of the spray gun body.
To the joint 42 having a passage communicating with the cap nut 4
A container container 101 for storing paint, a paint supply pipe 103 having one end connected to the paint passage portion of the joint 42 and the other end located on the bottom side of the container body 101; It has a lid set 105 for keeping the inside of the container body 101 in a hermetically sealed state, and pressure-feeds the paint through the paint supply pipe 103 in accordance with the pressure inside the container body. The lid set 105 includes a lid 111 that covers the container body 101, a protrusion 112 that has an insertion portion 112 </ b> A for the paint supply pipe 103 and that protrudes from the lid 111, and the container body 10.
1. An arm 113 having a pair of latch portions 113 </ b> A that engages with a pair of pins 107 provided on the upper part of the arm 1 and the arm 11
3 is coupled to the end face cam, and by biasing the arm upward in the drawing in accordance with the rotation, the container main body 101 is closed via the pin.
11 has an operation lever 114 for bringing it into close contact.

An air passage 26 is branched from the air passage 22 toward a joint 42 for mounting a pressurized container. An air passage 43 continuous with the air passage 26 is formed in the joint 42 so that compressed air is introduced into the container body 101.

2 (A) and 2 (B) are a plan view and a sectional view taken along line BB of the pressure container 100 with its container body 101 removed, see FIG. 1 and FIG. The page (5) will be used to explain the compressed air introduction path and the like into the container body. Supply pipe tip portion 103A coupled to the joint 42
Is fitted into a cap 121 having an inner diameter slightly larger than its outer dimension or having a required groove along the supply pipe. Further, the cap 121 is screwed to the tip of the protruding portion 112 of the lid 111. There is. The inner peripheral surface forms a gap 123 with the outer peripheral surface of the supply pipe at a portion of the lid protruding portion 112 that is located outside the cap 121, and these allow the air passage 26 in the spray gun main body to move into the joint 42. The gap 123 formed by the inner peripheral surface of the lid protrusion 112 and the outer peripheral surface of the supply pipe communicates with each other through the air passage 43, the internal space of the cap nut 45, and the gap formed by the inner surface of the cap and the outer surface of the distal end of the supply tube. It will be.

130 is located at the end of the gap 123, which is a portion for introducing compressed air into the container, and is fitted in the supply pipe 103, and is arranged in a region that extends along the upper inner surface of the lid 111. It is a check valve formed of a flat film-like member having a central hole for receiving the insertion of the supply pipe 103 as shown in FIG. The check valve 130 opens the air passage toward the inside of the container body when the spray gun is in an operating state and the compressed air pressure is applied from the spray gun body side, while the check valve 130 is inside the container body when the operation of the spray gun is stopped. By the action of pressure, the air passage toward the air passage 26 of the spray gun is elastically deformed so as to be closed. As a material for forming the check valve 130, an appropriate material can be used as long as it has a predetermined elasticity and preferably has liquid resistance to the paint, and for example, foamed polyethylene or the like can be adopted.

Reference numeral 133 denotes an inner lid, which is a pressure container 100.
Or, it is arranged in order to prevent the paint from leaking out of the pressure container through the vent hole or other gap when the spray gun unit is tilted. A part of the inner lid 133 is recessed downward toward the inside of the container body, and a hole is provided at the bottom of the recess, so that when the paint leaks between the inner lid 133 and the lid 111. Collect this in the hollow,
The paint is returned from the hole to the container page (6) body.

Reference numeral 135 is an air passage that connects the space formed by the inner lid 133 and the lid 111 to the inside of the container body 101, and is used when the spray gun unit is tilted and used with the tip of the gun facing downward. It is preferable to be provided so as to be located on the side of the grip portion 30 of the gun so as to prevent clogging by the paint or leakage of the paint when the operation is stopped. Further, reference numeral 137 is a vent valve for opening and closing the vent port provided in the lid 111, which is used for removing the residual pressure in the pressurizing container at the end of use of the spray gun unit.

In the above construction, when the trigger 28 is operated, the air valve 37 connects the air passage 20 in response to the retreat of the needle valve 35, and the compressed air is passed through the air passages 22 and 2 to the air cap side. Be led to. In addition, the air passage 22
From the side of the air passage 26 that is further branched, the air passage 43 in the joint 42, the internal space of the cap nut 45, the gap between the inner surface of the cap and the outer surface of the tip of the supply pipe, and the inner peripheral surface of the lid protrusion and the outer peripheral surface of the supply pipe. The gap 123 formed by and is deformed to deform the check valve 130, whereby the check valve 130 is expanded and the compressed air is guided, and the inner lid 133 and the lid 11
Thus, the inside of the container body 101 is pressurized from the space formed by 1 through the air passage 135. On the other hand, since the paint outlet at the tip of the gun is opened as the needle valve 35 retracts, the stored paint is pumped toward the paint passage 40 via the supply pipe 103 with the pressurization in the container body. And is injected together with air through the central air hole 4C.

When the operation of the trigger 28 is released, the needle valve 35 advances by the biasing force of the spring 50, the needle valve 35 closes the paint outlet accordingly, and the air valve 37 closes the air passage 20. Blockage and stop spraying paint and air. At this time, the compressed air in the air passage downstream of the air valve 37 is exhausted from the air hole, but the check valve 130 is deformed by the residual pressure in the container body, and the outflow of air to the gap 123 is blocked. It Page (7) In other words, even if the operation of the trigger 28 is released, the pressurized state is maintained inside the container body, so that the paint will be immediately sprayed the next time the trigger 28 is operated. become.

According to the above embodiment, once the inside of the pressure container is pressurized at the start of use of the spray gun,
Since the pressurized state is maintained even if the operation of the trigger 28 is released, it is possible to eliminate the time lag from the time when the trigger 28 is pulled until the paint is sprayed, and the operability of the spray gun unit can be improved. .

In this embodiment, the check valve is provided in the lid portion of the pressurizing container to increase the pressure receiving area without increasing the size of the spray gun unit and operate the valve with a small pressure. Although it has an excellent effect that it can be operated, if it can properly maintain the pressurized state, it goes to the pressurized container downstream of the air valve that opens and closes the air passage with the operation of the trigger. A check valve may be provided at any part of the air passage.

For example, in the configuration of FIG. 1, the air passage 26
You may arrange a check valve in. Further, the air passage 43 in the joint 42, the internal space of the cap nut 45, the gap formed by the inner surface of the cap and the outer surface of the tip of the supply pipe, and the gap 123 formed by the inner peripheral surface of the lid protrusion and the outer peripheral surface of the supply tube. Without a valve, the branch passage provided in the air passage downstream of the air valve 37 and the inside of the container body are connected by a tube or the like provided outside the gun body, and a check valve is arranged in the middle of the tube or the like. You may do it.

Further, the structure of the check valve is not limited to the elastic film-like member as in the above example, but may be a conical member such as a conical member. Further, in order to allow the displacement with a small operating pressure, a required spring bias can be performed.

Page (8)

As described above, according to the present invention,
An air passage from the downstream of the air valve that opens and closes the compressed air passage to spray and stop the paint toward the object to be coated toward the pressurized container is formed, and the inside of the container body of the pressurized container is pressurized. In the configuration for pressure-feeding paint, a check valve is provided in the air passage toward the inside of the container body,
When the compressed air passage is closed by the air valve, the check valve prevents the compressed air from flowing out of the pressurized container, so the pressurized state is maintained in the pressurized container even if the spray gun is deactivated. Therefore, the time lag from the start of the next operation to the spraying of the paint can be eliminated, and the operability of the spray gun unit can be improved.

[0024]

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a spray gun unit equipped with a pressure container of the present invention.

FIG. 2A and FIG. 2B are a plan view and a cross-sectional view taken along line BB of the pressurized container of the embodiment with its container body removed.

FIG. 3 is a plan view showing a configuration example of a check valve applied to the pressurized container of the embodiment.

[0025]

[Explanation of symbols]

 1 Spray Gun Main Body 4 Air Cap 2, 20, 22, 26, 135 Air Passage 28 Trigger 30 Grip Page (9) 35 Needle Valve 37 Air Valve 40 Paint Passage 42 Joint 100 Pressurized Container 101 Container Body 103 Paint Supply Pipe 105 lid set 111 lid 112 lid protrusion 121 cap 123 gap 130 check valve 133 inner lid

Claims (3)

[Claims] 1. A pressurizing container for pressurizing the interior of the main body in response to the introduction of compressed air from a spray gun for spraying paint, and for sending the paint under pressure toward the spray gun. A pressurized container comprising a check valve for restricting a flow only in a direction of introduction into the main body. 2. The check valve is an elastically deformable film-shaped member that is located at an end of the introduction portion of the compressed air and is arranged in an area that extends along the inner surface of the pressurized container. The pressurized container of claim 1, wherein the pressurized container is. 3. An injection unit for forming an air passage from a downstream of an air valve that opens and closes a compressed air passage for injecting and stopping the paint to a pressurized container and pressurizing the inside of the pressurized container. In the spray gun unit for pressure-feeding paint toward the inside, a check valve is provided in the air passage toward the inside of the pressurized container, and when the compressed air passage is closed by the air valve, The spray gun unit is characterized in that it prevents the compressed air from flowing out.