JP2566404B2 - Hand gun for painting - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is designed to perform coating by opening a switching valve by pulling a trigger and discharging paint or compressed air from the tip of the barrel. Regarding the hand gun for painting,
In particular, the present invention relates to a painting handgun that enables easy replacement of parts of an on-off valve.

2. Description of the Related Art Problems to be Solved by the Related Art and Invention For example, an air spray type painting handgun has an inflow port connected to an outflow passage reaching the paint outlet of a nozzle chip at the tip of the gun and an external paint supply source. A valve chamber that communicates with the channel is provided, and an outlet for communicating with the paint atomization nozzle of the nozzle chip and an outlet for communicating with the paint pattern control outlet and an inlet connected to an external compressed air supply source are connected. By piercing the valve chambers, the valve bodies with operating rods projecting to the outside of the barrel are installed in both valve chambers so that they are always in contact with the valve mouth and kept closed. A normally closed paint opening / closing valve and a compressed air opening / closing valve are configured, and by pulling a trigger that engages with the protruding end of each operating rod, both operating rods are simultaneously pushed into the barrel and each valve body is pushed. Is separated from the valve opening, both on-off valves open, and the outflow path is Through this, the paint discharged from the paint discharge port is atomized by the compressed air discharged from the atomization discharge port and discharged while forming an elliptical shape by the compressed air discharged from the pattern control discharge port. About
It is designed to be painted, and these on-off valves are easily worn because the contact part between the valve body and the valve seat fitted in the valve mouth and the sealing part between the operating rod and the barrel are easily worn. However, in the past, the on-off valve was built into the barrel, so the entire barrel had to be disassembled when replacing the parts, which was a cumbersome and time-consuming task. There is a drawback that it takes time, and this is a problem common to not only the air spray type handgun but also the airless spray type handgun having only the on-off valve for paint built therein.

Means for Solving the Problems The present invention provides means for solving the above problems,
A mounting surface is formed on the outer surface of the barrel having a paint discharge port at the tip, and a discharge port at the tip and a first port communicating with a supply source of paint or air for atomizing the paint or controlling the paint pattern Is formed side by side with the second port communicating with
The fixed surface formed on the outer surface of the body is formed with the inlet and the outlet arranged side by side, and the operation rod that opens by pushing is provided with a normally-closed on-off valve that protrudes from the front of the body. The 1st port is aligned with the inflow port, the 2nd port is aligned with the outflow port, and the port is detachably fixed to the barrel so that there is no gap between the mounting surface and the fixed surface. Is configured to be engaged with a trigger pivotally supported on the barrel.

The operation and effect of the present invention is configured as described above, and when paint or air for paint atomization or paint pattern control is supplied into the barrel from each supply source, the paint or air is applied to the mounting surface of the barrel. The operating port of the on-off valve is pushed into the body by pulling the trigger pivotally supported on the barrel from the formed first port through the inlet of the on-off valve into the on-off valve without leaking and pulling the trigger pivotally supported on the barrel. Is opened and the above paint or air is discharged from the discharge port at the tip of the barrel through the second port without leaking from the outlet,
Since the on-off valve was unitized and attached to the barrel detachably, the work of replacing the internal parts of the on-off valve was done by disassembling the on-off valve from the barrel and preparing it as a spare. It can be easily and quickly installed by simply attaching the on-off valve, and if the on-off valve becomes unusable due to its life or irreparable failure, only the on-off valve needs to be replaced. Therefore, since the barrel itself can be used as it is, the cost can be kept low.

Embodiment An embodiment in which the present invention is applied to a hand gun for air spray type electrostatic coating will be described below with reference to the accompanying drawings.

In the handgun of this embodiment, a paint supplied under a low pressure from a paint supply source (not shown) and compressed air supplied from a compressor (not shown) are attached to the right rear part of the barrel 1 through a paint inflow path 5 in a grip 2, respectively. A normally closed on-off valve 3 for paint and an air inflow path 6 in the grip 2 as well.
To a normally closed on-off valve 4 for compressed air attached to the left rear part of the barrel 1, and pulling a trigger 9 attached to the barrel 1 by a support shaft 8 to freely swing the on-off valve 3 Then, the paint passes through the paint outflow passage 10 in the barrel 1 and is guided to the nozzle chip 14 screwed to the tip of the barrel 1, and at the same time, the open / close valve 4 opens and the compressed air mainly atomizes the paint. Partly through the air outflow passage 11 for paint and led to the nozzle chip 14 through the air outflow passage 12 for paint pattern control, and the paint discharged from the paint discharge port 15 at the center of the nozzle chip 14 is the paint formed around it. It is atomized by the compressed air ejected from the atomizing ejection port 16 and is ejected while forming an elliptical shape by the compressed air ejected from the pattern control ejection port 17 formed in the peripheral portion of the nozzle chip 14, and the barrel The high-voltage cable 18 introduced in 1. The negative charge is applied by the electrode 19 connected to a high voltage generator (not shown) via the electrode 19, so that it is applied to an object (not shown) that is positively charged.

Next, attachment of the on-off valves 3 and 4 to the barrel 1 will be described.

On the right rear part of the barrel 1, there is formed a flat mounting surface 20 having a supply port 21 communicating with the paint inflow passage 5 of the grip 2 and a discharge port 22 communicating with the paint outflow passage 10 of the barrel 1. At the left rear part of the barrel 1, an air supply port 24 communicating with the air inflow passage 6 of the grip 2 and an exhaust port 25 for paint atomization communicating with the two air outflow passages 11 and 12 of the barrel 1,
A flat mounting surface 23 is formed on which an exhaust port 26 for pattern control is formed.

Open / close valve 3 for paint attached to the right rear part of barrel 1
Is a tubular body 30 having a flat fixing surface 31 formed on the outer side of the body 30 that is in close contact with the mounting surface 20 of the barrel 1. The fixing surface 31 is aligned with the feed port 21 of the barrel 1. Inlet to
An outlet 33 is formed which is aligned with 32 and the discharge port 22, and a hollow rear end portion that penetrates the body 30 in the front-rear direction is communicated with the inlet 32 by closing the open rear end with a screw lid 35. An inlet chamber 36 is formed, and a hollow central portion has a small-diameter outlet chamber communicating with the outlet 33 by screwing a bottomed cylindrical support member 37 at the front end to close the front.
38 is formed, and an O-ring 40 serving as a valve seat is fixed to the reduced diameter step portion of the inlet chamber 36 to form a valve port 41.
A valve body 42 that opens and closes the valve opening 41 by contacting and separating from the O-ring 40 from the 36 side
Is screwed to the rear end of the operating rod 45 protruding through the sliding hole 43 of the support body 37 to the front of the body 30, and is supported by the rear end surface of the engaging body 46 fixed to the front end of the operating rod 45. The elastic force of the compression coil spring 47 mounted between the body 37 and the back end surface of the body 37 causes the operating rod to move.
Since the valve element 42 contacts the O-ring 40 and is urged in the direction of closing the valve opening 41 while 45 projects forward,
The paint that flows into the outlet chamber 38 leaks to the outside from the sliding hole 43 of the support body 37 around the portion of the operating rod 45 exposed in the outlet chamber 38 so as to be held in the closed state. A metal bellows 48 for preventing the above is mounted, and a stopper 50 for adjusting the amount of paint to be discharged, in which the front end face 51 is inclined with respect to the axis, is provided on the inner periphery of the support body 37. Operation rod inside
The on-off valve 3 is mounted so as to be screwed by screwing the rear end portion while penetrating the engagement body 46 of 45, and this on-off valve 3 connects the inlet 32 on the inlet chamber 36 side to the feed port 21 of the barrel 1. In the exit room
The outlet 33 on the 38 side is aligned with the discharge port 22, respectively, and the O-rings 54, 54 fitted around the respective ports 21, 22 of the attachment surface 20 of the barrel 1 are used to attach the attachment surface 20 and the fixed surface 31. In order to prevent the paint from leaking from the gap between the two, the screw 80 is inserted through the body 30, screwed into the mounting surface 20 and tightened to be fixed so as to be detachable, and the engaging body 46 protruding from the stopper 50.
Of the trigger 9 supported by the barrel 1 corresponds to the slightly bulging contact portion 9a on the right side of the trigger 9. And trigger 9
When the lever is pulled, its abutting portion 9a abuts on the engaging body 46 and pushes it in, whereby the operating rod 45 moves rearward against the elastic force of the compression coil spring 47, and the valve body 42 causes the O-ring 40 to move. The valve opening 41 is opened apart from the valve opening 41, the paint flowing from the inlet 32 into the inlet chamber 36 flows from the valve opening 41 to the outlet chamber 38, and is sent to the paint outlet 10 of the barrel 1 through the outlet 33. When trigger 9
It is possible to keep the discharge amount of the paint constant by contacting the lower end portion of the front end surface 51 of the stopper 50, and in this case, the discharge amount of the paint becomes the maximum. For the maximum discharge amount, the stopper 50 is screwed with respect to the support 37 to change the amount of advancement and the direction of the inclination of the front end face 51 to adjust the pulling margin of the trigger 9 until it hits the stopper 50. The maximum opening degree of the valve opening 41 can be adjusted by changing the pushing amount of the valve.

Further, the open / close valve 4 for compressed air attached to the left rear portion of the barrel 1 has a flat mounting surface 61 corresponding to the fixed surface 23 of the barrel 1 formed on the outer side of the tubular body 60. The fixed surface 61 has an inlet port 62 and two exhaust ports 25 aligned with the air supply port 24 formed on the mounting surface 23 of the barrel 1.
Outlets 63, 64 aligned with 26 are formed, and a hollow rear end portion that penetrates the body 60 communicates with the inflow port 62 by airtightly screwing a screw lid 65 to the open rear end. Entrance room 66
And a small diameter outlet chamber 68 communicating with the two outflow ports 63, 64 by airtightly screwing a sealing body 67 to the open front end. The rear end face 69 of the sealing body 67 facing the outlet chamber 68 is formed obliquely with respect to the axis, and the pattern control outlet 64 located in front of the atomizing outlet 63 is sealed. It is partially closed by the outer peripheral surface of the rear end portion of the body 67, and an O-ring 70 serving as a valve seat is fixed to the reduced diameter step portion of the inlet chamber 66 to fix the valve opening 71.
Is formed, and the O-ring 70 is contacted and separated from the inlet chamber 66 side, and the valve opening is formed.
A valve body 72 that opens and closes 71 is fixed to the rear end of the operating rod 75 that penetrates the center hole 73 of the sealing body 67 in an airtight and slidable manner, and is in contact with the screw lid 65. The compression coil spring 77 attached to the is urged in the valve closing direction by the elastic expansion force, and the on-off valve 4 airtightly adheres to the mounting surface 23 of the barrel 1 by sandwiching the fixed surface 61 of the gasket 79. In addition, the inlet 62 is aligned with the air supply port 24 of the barrel 1, and the outlets 63 and 64 for atomization and pattern control are aligned with the exhaust ports 25 and 26 for atomization and pattern control, respectively. While the screw 80 penetrates the body 60 and is screwed into the mounting surface 23 and tightened, the screw 80 is detachably fixed, and the front end portion of the operating rod 75 protruding from the sealing body 67 projects to the left side of the trigger 9. It corresponds to the contact portion 9b. When the trigger 9 is pulled and the on-off valve 3 for paint is opened as described above, at the same time, the contact portion 9b of the trigger 9 contacts the front end portion of the operating rod 75 and pushes it in. The valve body 72 is a compression coil spring
The valve opening 71 is opened by moving while compressing 77, and the compressed air flowing from the inflow port 62 into the inlet chamber 66 flows through the valve port 71 into the outlet chamber 68, and the outflow port 63 for atomization. And the air outlet 64 for pattern control, and each of the air outflow passages 11 of the barrel 1
In addition, the elliptical release pattern of the paint is adjusted by screwing the sealing body 67 with respect to the body 60 and controlling the pattern from the direction of the inclined rear end face 69 and the amount of screw advancement. This can be done by changing the opening degree of the outlet 64 with respect to the outlet chamber 68 and adjusting the flow rate of the compressed air ejected from the pattern control discharge port 17.

In the above embodiment, an example applied to a handgun for air spray type electrostatic coating has been described, but the present invention is not limited to this, and an air spray type for non-electrostatic coating or airless. It can also be applied to other painting handguns such as those for spray type electrostatic painting and non-electrostatic painting.

[Brief description of drawings]

The attached drawings show an embodiment of the present invention. Fig. 1 is an external perspective view of the on-off valve separated from the barrel, Fig. 2 is a partially cutaway side view, and Fig. 3 is a cross section showing the structure of the on-off valve. 4 and 5 are sectional views showing the operation of the trigger. 1: Barrel, 3: Open / close valve (for paint), 4: Open / close valve for air, 9: Trigger, 15: Paint outlet, 16: (Air for paint atomization) outlet, 17: Outlet (for air for controlling paint pattern), 20, 23: Mounting surface, 21: Inlet port (for paint), 22:
Discharge port (for paint), 24: Air supply port (for air), 25:
Exhaust port (for air for paint atomization), 26: Exhaust port for air (for paint pattern control) 30, 60: Body, 31, 6
1: Fixed surface, 32: (Paint) inlet, 62: (Air) inlet, 33: (Paint) outlet, 41, 71: Valve mouth, 42, 72: Valve body, 45, 75: Operating rod, 63: Outlet (for air for paint atomization), 64: Outlet (for air for paint pattern control)

Claims (1)

(57) [Claims] 1. A first port having a mounting surface formed on the outer surface of a barrel having a paint discharge port at its tip, and communicating with a supply source of paint or air for paint atomization or paint pattern control. And a second port communicating with the discharge port at the tip are formed side by side, an inflow port and an outflow port are formed side by side on a fixed surface formed on the outer surface of the body, and an operating rod that opens by pushing is provided on the front surface of the body. A normally-closed on-off valve that protrudes from the first port to the inflow port and the second port to the second port.
The ports are aligned with the outlets, respectively, and are detachably fixed to the barrel so that there is no gap between the mounting surface and the fixing surface, and the operating rod of the on-off valve is attached to the barrel. A coating handgun characterized by being engaged with a trigger pivotally supported on the