JPS6234604Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an electrostatic air hand gun.

Generally, an electrostatic gun uses a high voltage cable with a high resistance element at the tip inserted into the gun barrel, and supplies high voltage to a charging electrode at the tip of the gun to charge the paint and perform electrostatic painting. It is an essential technical issue to ensure its insulation, ensure a high potential at the charged electrode at the tip, and prevent creeping discharge. For this reason, various proposals have been made to prevent creeping discharge.

In other words, creeping discharge in high-voltage electrical paths that include high-resistance elements is countered by covering and sealing the entire path with an insulating material, but the needle valve that penetrates from the paint chamber to the rear of the gun barrel The insertion hole has a hollow conduit, and in order to deal with the return discharge from the charged electrode via the paint, a meandering insulated guide is attached to the rear end of the needle valve core rod. The substantial creeping discharge distance (insulation distance) from the conductive part at the front end to the conductive part at the rear of the gun is extended.

The present invention eliminates the complicated insulating guide of conventional processing, and maintains the distance to prevent creeping discharge.
The purpose of this invention is to provide an electrostatic air hand gun that can be constructed with a short gun length, and prevents creeping discharge that penetrates the needle valve insertion hole from the tip of the gun to the operating section at the rear end. It is formed of a resin pipe of the required length, the rear end of which is positioned behind the trigger, and a needle valve extending from the rear end is operated via an air valve provided on the rear outer periphery of the resin pipe. This is what I did.

The configuration of the present invention will be described below with reference to the illustrated embodiments.

Reference numeral 1 denotes a gun body consisting of a barrel part 2 and a grip part 3 integrally formed of an insulating material.A conductive paint nozzle 4 connects to an air cap 5 at the front end of the barrel part 2 of the gun body 1 to form a pattern. A needle valve 7, which is attached to the gun body 1 and moves back and forth in conjunction with the operation of a trigger 6, is provided through the gun body 1 with a needle valve core 7'.

Furthermore, the gun body 1 is provided with a needle valve insertion hole 10 made of a resin pipe that penetrates from the paint chamber 8 at the tip of the gun to the operation part 9 at the rear end in the center of the interior, and a paint passage 11 made of a resin pipe as well as air. It is integrally molded with a passage 12 and a high resistance body 13. Further, the tip of the needle valve 7 penetrates the paint chamber 8 of the paint nozzle 4 and can freely enter the paint spout at the center of the tip to open and close the paint spout, and the base end is connected to a needle valve gasket pusher 14 and a needle valve gasket 16. is attached to prevent the paint from flowing out in the paint chamber 8, and a needle valve core rod 7' integrally formed behind it moves back and forth within the needle valve insertion hole 10 made of a resin pipe.
The rear end of this resin tube extends to the rear of the trigger 6,
Furthermore, the rear end of the needle valve core rod 7' extends to the rear thereof, and the needle valve 7, which is integral with the needle valve core rod 7', is an air valve 1 provided on the outer periphery of the rear end of the resin pipe.
5 and is actuated by a trigger 6. 17 is a high voltage cable insertion hole, 18 is a hook portion made of a conductive material, and 19 is an air pipe.

To explain the operation of the present invention in the above configuration, during electrostatic painting, paint and air are transferred to the gun body 1.
A paint hose (not shown) from the base end of the grip part 3,
The air pipe 19 supplies the paint passage 11 and the air passage 12 in the main body 1, and high voltage is supplied to the high voltage cable (not shown) insertion hole 17 and the high resistance element 13.
is supplied to the charging electrode of the paint nozzle 4 via
By pulling the trigger 6, the needle valve 7 is moved back, and the paint is atomized and sprayed together with compressed air from the paint nozzle 4 at the tip, and a high voltage is applied to perform electrostatic painting.

In this case, the high voltage returns via the paint in the paint chamber 8 of the paint nozzle 4 and returns to the needle valve insertion hole 10.
However, the needle valve insertion hole 10
is formed of a resin tube having a length that penetrates from the paint chamber 8 to the operation part 9 at the rear end of the gun, and is arranged with the necessary length l to prevent creeping discharge. Sufficient insulation distance can be maintained.

As described above, in the present invention, the needle valve insertion hole is made of a resin pipe with a length that penetrates from the paint chamber at the tip of the gun to the operating section at the rear end of the gun, and is arranged with a sufficient insulation distance. It is possible to prevent creeping discharge via the paint, and in addition, the length of the barrel made of insulating material is made longer in order to take the insulation distance to prevent creeping discharge, and grounding objects such as triggers and hooks located on the outside are used. Compared to the case where the position of the conductive part was moved backwards, the resin pipe for insulation can be extended from the trigger to the operation part behind the trigger, making it possible to shorten the length of the gun, making the gun easier to handle. improves.

Furthermore, in the present invention, the needle valve insertion hole made of a resin pipe is formed by being cast into the gun body in advance when molding the gun, so there is no need to form a complicated insulated guide as in conventional guns, making processing easier. It is something that can be achieved.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1. 1... Gun body, 2... Barrel, 4... Paint nozzle, 7... Needle valve, 7'... Needle valve core, 8... Paint chamber, 9... Operation section, 10... Needle valve Insertion hole.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A needle valve gasket through which the needle valve passes is provided at the rear of the paint chamber at the tip of the gun, and a resin pipe into which the needle valve is inserted extends rearward through the needle valve gasket and extends rearward from the gasket. The rear end of the resin tube is located at a distance sufficient to prevent creeping discharge of high voltage, and an air valve is provided on the rear outer periphery of the resin tube, and the rear end is located behind the trigger part, and an air valve is provided on the outer periphery of the rear part of the resin tube. An electrostatic air hand gun in which a needle valve for emitting air is actuated by a trigger located in front of the air valve. 2. The electrostatic air hand gun according to claim 1, wherein the resin pipe is formed by being cast into the gun body in advance.