JPH0463749B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention makes it possible to spray architectural coating materials, etc. by detachably attaching an air discharge tool to an airless gun, and also enables spraying of construction materials, etc. as well as a conventional airless gun. The present invention relates to a spray gun which can be used for various purposes and whose versatility can be improved.

[Background technology]

The spraying of architectural coatings, such as tiles and crater-like pattern paints, on objects to be coated has traditionally consisted of a thick, patterned under-spraying process, and a finishing coat in which the under-sprayed surface is coated, etc. is being carried out.

In addition, when performing this kind of underspray painting, conventionally, it is applied continuously with a cylindrical spray tool using a snake-type pump, squeeze-type pump, etc., or by using a regular construction gun. It was being applied. Furthermore, as a finishing coating, a finishing coating such as a coating material that is pumped under high pressure is sprayed using an airless gun.

However, although it is possible to paint continuously using a snake-type pump, there is a problem in that the equipment itself becomes large and increases equipment cost. Because of this, the paint material stored in the paint cup increases its weight, which impairs handling and causes fatigue for workers, and it is necessary to interrupt the painting operation when refilling the paint cup with paint material. There was a problem that the work efficiency was also reduced. Also, in any case, for finishing painting,
Since two types of devices, that is, a device using an airless gun, are required, many problems arise, such as an increase in the size of the device and an increase in device cost.

[Purpose of the invention]

The present invention focuses on an airless gun that can efficiently and continuously spray thick coats and can be suitably used for large objects to be coated, and the basic idea is that an air discharge tool is detachably attached to the airless gun. This makes it possible to spray architectural coating materials, etc., and also reduces the size and cost of the equipment and improves work efficiency.In addition, by attaching a spray nozzle instead of an air discharge device, it is possible to use an airless gun. The purpose of the present invention is to provide a spray gun that can be used as a spray gun and has improved versatility.

[Disclosure of the invention]

An embodiment of the present invention will be described below based on the drawings.

In the figure, a spray gun 1 is configured to apply coating material to a tip opening 2.
An airless gun 3 capable of discharging from the airless gun 3 is provided with a main part 7 formed on a mounting part 5 via a joint part 6, and a housing 13 is attached with a coating material nozzle 12 having an inner hole 11 at the tip 10 of the main part 7; An air nozzle 15 concentric with the inner hole 11 is provided at the tip and a rear end 16
An air discharge device 20 having an air pipe 19 to which a high-pressure air source C is connected is detachably attached.

In this example, the airless gun 3 is a conventional airless gun that is usually commercially available, and has a pistol shape with a handle 22 at the lower end of the body 21, and a trigger that hangs down in front of the handle 22 at the front of the body 21. 23 is pivotally mounted. Further, the airless gun 3 has a coating material flow path extending along the handle 22 from the coating nipple 5 at the lower end of the handle 22 and leading to the tip opening 2 of the body 21. Further, the trigger 23 is provided in the coating material flow path.
A well-known on-off valve that can open and close the coating material flow path is disposed by the operation, and the coating material pumped from the coating material pumping device P using a pail can or the like that communicates with the coating material nipple 25 is fed. Can be turned on or off. Further, the airless gun 3 has a screw for attaching the air discharge tool 20 carved on the outer periphery of the distal end portion 26 of the body portion 21.

The air discharge tool 20 is formed from a housing 13 and an air pipe 19 attached to the housing 13.

In this example, the housing 13 includes a mounting portion 5 having approximately the same diameter as the tip portion 26 of the airless gun 3, and a mounting portion 5.
It has a substantially S-shaped base body 29 integrally formed with a joint part 6 rising up from the joint part 6 and a main part 7 extending substantially parallel to the mounting part 5 at the upper edge of the joint part 6. Further, a screw hole 31 opposite to the tip opening 2 is formed in the mounting portion 5, and the inner hole diameter D1 of the guide hole 9 opened at the tip 10 of the main portion 7 is larger than the inner hole diameter D2 of the screw hole 31. The guide hole 9 and the screw hole 31 communicate with each other through an upright hole 30 passing through the joint portion 6.

In addition, the main portion 7 has a tapered cone-shaped inner diameter 1 at the tip 10.
A coating material nozzle 12 having a cap nut 3 screwed onto the tip 10 is disposed.
It is sandwiched by 2.

Therefore, the housing 13 has a coating material flow path that opens at the tip of the coating material nozzle 12 and the rear end of the mounting portion 5 through the inner hole 11, the guide hole 9, the upright hole 30, and the screw hole 31 of the coating material nozzle 12. 27 is formed.

Further, an air pipe 19 whose rear end communicates with a high-pressure air source C is inserted into the housing 13 via a fixing fitting 35 attached to the rear wall 17 of the main portion 7.

The air pipe 19 has an air nozzle 15 having a tapered outer circumferential surface 15A concentrically screwed into the tip of a base pipe part 37 having an air hole 36 whose rear end communicates with a high-pressure air source C. wear.

Further, in this example, the fixing fitting 35 is attached to a cylindrical fixing fitting piece 40 with a flange that is screwed into a screw hole 39 provided in the rear wall 17, and a threaded portion 40A that protrudes from the rear end peripheral surface of the flange. It also has a retractable metal fitting piece 41. The fixing metal piece 40 has a center hole 42 that is concentric with the inner hole 11 of the painting nozzle 12.
The base pipe portion 37 of the air pipe 19 can be slidably sealed and held by a sealing material or the like provided around the air pipe 19 .

Further, a reciprocating metal piece 41 such as a cap nut is attached to the threaded portion 40A and is secured to the rear part of the base tube part 37 by means such as pin connection or ring connection, and the reciprocating metal piece 41 is connected to the fixing metal piece 40. The air pipe 19 can be attached so as to be movable and fixed by screwing forward and backward. Note that the air discharge tool 20 is connected to the inner hole 1 of the coating material nozzle 12.
By inserting the base tube part 37 attached coaxially with the air nozzle 15 into the center hole 42 coaxially with the air nozzle 15,
The inner hole 11 and the air nozzle 15 can be arranged concentrically.

The air pipe 19 can change the cross-sectional area of the gap between the inner hole 11 and the air nozzle 15 as it advances and retreats, and furthermore, the air pipe 19 can change the cross-sectional area of the gap between the inner hole 11 and the air nozzle 15 as it advances and retreats. The spraying pattern of the coating material sprayed from the nozzle 12 can be changed in various ways. A high-pressure air source C is connected to the rear end 16 of the air pipe 19 protruding from the rear wall 17 via an air nipple 50, an elbow fitting 51, a metering pot 52, and the like.

Moreover, the airless gun 3 and the air discharge tool 20 are
They are detachably connected by a joint fitting 55. In this example, the fitting 55 is connected to the screw hole 3 of the mounting portion 5.
A cylindrical joint piece 57 is screwed onto the airless gun 3 and has a locking collar 56 around its rear end, and a collar 59 that engages with the locking collar 56 and is screwed onto the tip 26 of the airless gun 3. Therefore, by sandwiching the locking collar portion 56 with the engaging collar portion 59, the tip opening 2 of the airless gun 3 and the inner hole of the mounting portion 5, that is, the screw The hole 31 is connected to the center hole 57 of the connecting tube piece 57.
It can be detachably attached while being electrically connected through A.

[Effect]

Thus, the spray gun 1 discharges a relatively highly viscous tile or crater-like pattern coating material from the tip opening 2, which is fed under high pressure by the coating material pressure feeding device P. Also, guide hole 9
Since the inner hole diameter D1 of the mounting portion 5 is larger than the inner hole diameter D2 of the mounting portion 5, the discharged coating material flows through the guide hole 9.
The coating material is fed to the tip of the coating material nozzle 12 while being depressurized within the coating material channel 27 containing the coating material.

Also, the fed coating material enters the inner hole 1 of the coating material nozzle 12.
The air discharged from the air nozzle provided concentrically with 1 can be blown out in a substantially mist form. The coating material that is sprayed is
The pattern of the sprayed coating material can be changed in various ways by moving the air nozzle 15 forward and backward using the advancing/retracting metal piece 41 and by changing the amount of compressed air from the air nozzle 15 using the metering knob 52.

In addition, the spray gun 1 can be used to spray tiles and crater pattern coating materials, which could not be used with conventional airless guns due to the high pumping pressure, and architectural coating materials containing coarse particles, fibers, etc., which could not be used due to the nozzle shape. In addition to being suitable for use in construction, the gun body can be made lighter and spraying can be carried out continuously, improving workability and handling compared to conventional construction guns. In addition, the high-pressure air source C and the coating material pressure feeding device P can be a conventionally used air compressor for an airless gun, an airless pump, or an electric airless pump connected to a paint container such as a pail can or drum, making the device more compact. , making it possible to reduce costs.

Further, FIGS. 2 to 4 illustrate the spray nozzle 61 of the airless gun 3 used for finishing coating.
In this example, the spray nozzle 61 has a substantially U-shaped cutout groove 63A at the tip of a circular base 63 surrounding a locking collar 62, and has a stepped center hole 63B bored inside, and a stepped center hole 63B. is provided with an internal tip 65 formed of a spherical tip and fitted with a stepped portion. The internal chip 65 has a tapered nozzle hole 65A, and the nozzle hole 65A has a tapered shape.
5A has a slit opening 65B parallel to the notch groove 63A opened at the tip. Therefore, the spray nozzle 61 can spray in a spray pattern that is regulated in the width direction of the U-shape and spreads in the direction of the notch, and both ends of the pattern are made thin and soft, so that the overcoated parts are not noticeable. .

Therefore, the spray gun 1 can be used as a conventional airless gun by replacing the air discharging device 20 with the conventionally used spray nozzle 61 and by connecting a coating material pressure feeding device that accommodates finishing coating materials such as coating materials. can also be used, increasing its versatility.

〔Effect of the invention〕

As described above, in the spray gun of the present invention, an air discharge device including a housing having a main portion forming a guide hole larger than the inner diameter of the mounting portion and an air pipe can be detachably attached to the airless gun. For installation, it is possible to continuously spray tiles, architectural coating materials such as crater-like pattern coating materials, etc., which improves workability, and also improves handling by reducing the weight of the gun body. In addition, the high-pressure air source and coating material pumping device that can be used as a conventional airless gun can be used as is, making the device more compact and reducing costs. By replacing the air discharge device with a spray nozzle, it can also be used as a conventional airless gun. It can have many effects, such as increasing its versatility.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
The figure shows a front view of a conventional airless gun, parts 3 and 4.
The figures are a sectional view and a perspective view showing a conventional spray nozzle for an airless gun. 2...Tip opening, 3...Airless gun, 5...
Mounting part, 6... joint part, 7... main part, 9... guiding hole, 10... tip, 11... inner hole, 12... coating material nozzle, 13... housing, 15... air nozzle, 16... Rear end portion, 17... Rear wall, 19... Air pipe, 20... Air discharge tool, C... High pressure air source,
D1, D2... Inner hole diameter.

Claims (1)

[Claims] 1. An airless gun capable of discharging a coating material fed at high pressure from a tip opening, and having a main part formed approximately parallel to the mounting part through a joint part at the mounting part, and connecting the mounting part and the main part. A housing having a communicating hole formed therein and having an inner hole diameter of the main part larger than the inner hole diameter of the mounting part, and a coating material nozzle having a cone-shaped inner hole at the tip communicating with the guide hole at the tip of the main part. and has an air nozzle at its tip that is concentric with the inner hole of the coating material nozzle, and a high-pressure air source is connected to the rear end, and the rear end protrudes from the rear wall of the main part. an air discharge tool having an air pipe that is attached so that it can be moved forward and backward and fixed, and the inner hole of the attachment part and the tip opening of the airless gun are brought into communication;
A spray gun that is detachably attached.