JPH1052652A - Air brush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air brush whose connecting structure of a connecting member to be connected to a valve main body can be simplified while keeping the high maintainability of an air feeding valve. SOLUTION: An air feeding valve 3 is internally installed in a connecting member 2 constituted independently of an air brush main body 1, and a compressed air guide-in aperture 22 communicating with the primary side of the air feeding valve 3 is provided on one of the end sections of the connecting member 2, and at the same time, the other end section 21 of the connecting member 2 is screwed into the connecting hole 10 of the air brush main body 1 so that the other end section 21 communicates with the upstream side end of an air passage 8a connected to a nozzle 5. Thus, the connecting member 2 can be detached from the air brush main body 1, and thereby the maintainability of the internal air feeding valve 3 of the member 2 is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air brush, and more particularly, to an air brush having a simplified structure.

[Prior art]

FIG. 5 shows a conventional air brush.
This airbrush includes an airbrush main body 101 formed in a substantially pencil shape. The needle 106 is slidably fitted along the axis of the airbrush body,
The needle 106 is slid in the axial direction by an operating rod 102 provided at an intermediate portion of the airbrush main body 101, so that compressed air is ejected from the nozzle 103 at the tip of the main body 101 together with the liquid paint to perform fine spraying. It is configured to do so.

A connection hole 101b is provided in an intermediate portion of the air brush main body 101, and an upper end of a substantially cylindrical fork member 104 is fitted and connected to the connection hole 101b, and is welded by solder or the like. It is integrated with the main body 101. An air supply passage 104 a is formed inside the fork member 104. The air supply passage 104a communicates with an air supply passage 101a formed along the inside of the air brush main body 101, and compressed air supplied from an air supply hose 110 is supplied to the nozzle 103 through the air supply passages 104a and 101a. It is configured to be performed.

[0004] A valve fitting 105 constituting an air supply valve is screwed and connected to the lower end of the fork member 104. The valve fitting 105 constitutes an air supply valve. The valve fitting 105 allows a valve shaft 107 to be inserted along an inner shaft core portion thereof, and a valve body 1 integrally formed at an intermediate portion of the valve shaft 107.
08 is seated from below on a valve seat 109 formed on the inner periphery of the hollow part of the fitting 105, and the valve body 108 is seated on the toilet seat 1 by a spring 111 mounted in the valve fitting 105.
09 is elastically urged to maintain the valve closed state.

When the lower end of the operating rod 102 and the upper end of the valve shaft 107 come into contact with each other and the operating rod 102 is pushed, the valve shaft 107 and the valve body 108 move downward to open the air supply valve. In this state, supply of air supply, that is, spraying of paint is started.

In the conventional airbrush constructed as described above, a fork member 104 is connected to an intermediate portion of the airbrush main body 101, and a joint portion is integrally welded by solder or the like. A valve fitting 105 is screw-connected to the lower end of the fork member 104, and an air supply hose 110 communicating with an air supply source such as a compressor or an air cylinder is screwed to the lower end of the valve fitting 105. Connected by

[0007]

The above-mentioned valve fitting 1
Since the air-tight O-ring 108a is fitted on the valve body 108 and the spring 111 is elastically mounted on the valve body 05, these parts need to be regularly maintained or replaced.

For this purpose, the conventional airbrush comprises a valve fitting 105 constituting an air supply valve and a fork member 104, which are separately formed. Only the valve fitting 105 is detached from the device, so that maintenance work of the air supply valve can be easily performed.

However, if the valve fitting 105 constituting the air supply valve and the fork member 104 are formed separately as described above, the number of parts increases and the manufacturing cost increases. Further, since the work of fitting the fork member 104 into the connection hole 101b of the valve body 101 and welding it by soldering or the like needs to be performed manually by a skilled worker, the labor and cost of manufacturing are further increased. Was.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and an object thereof is to maintain the air supply valve as described above while maintaining the maintenance of the air supply valve. The reason is to simplify the structures of the fork member and the valve fitting connected to the rationally.

[0011]

In order to solve the above-mentioned problems, the present invention operates an operating rod provided on an air brush main body to open an air supply valve and squeeze air from an air supply source. In an airbrush that introduces air into the airbrush body and sprays the liquid paint together with the compressed air from a nozzle at the tip of the airbrush body, a substantially cylindrical shape in which the air supply valve is formed separately from the airbrush body. Provided inside the connection member of the above, while providing an inlet for compressed air at one end of the connection member serving as the primary side of the air supply valve, the other end of the connection member serving as the secondary side of the air supply valve, An air supply valve which is screwed into a connection hole provided at a predetermined position of the air brush main body in a state where airtightness is maintained, communicates with an upstream end of an air flow path communicating with a nozzle, and is provided in a connection member. And the above operation Those formed by connecting and.

[0012] Further, when the other end of the connection member is screwed into the connection hole of the airbrush body and tightened, the airbrush can be stopped at any position of the screwing rotation. It is preferable to form a flow path that allows the upstream end of the air flow path on the brush main body side to communicate with the air supply valve secondary space on the connection member side.

According to the above-described means, the following operations are provided. A connection member connected to a predetermined portion of the airbrush main body is configured separately from the airbrush main body,
An air supply valve is provided inside a substantially cylindrical member. The connection member is provided with an inlet for compressed air at one end serving as the primary side of the air supply valve provided therein, and the other end serving as the secondary side of the air supply valve is connected to the connection hole of the air brush main body. It is screwed, and thereby detachably connected to the air brush main body. When the connection member is detached from the airbrush main body, the air supply valve provided therein can be maintained and inspected from one end or the other end of the member.

In the state where the connecting member is connected to the air brush main body as described above, the operating rod of the air brush main body and the valve element of the air supply valve provided in the connecting member are connected, and the operation rod is operated. The air supply valve is opened and closed. Further, the secondary space of the air supply valve in the connection member, the upstream end of the air flow path provided in the air brush main body communicates, with the opening of the air supply valve, from one end of the connection member. The introduced compressed air passes through the air flow path and is ejected from the nozzle at the tip of the air brush main body.

In the air brush according to the second aspect, when the other end of the connection member is screwed into the connection hole of the air brush body and tightened, the connection member is screwed in a state where the tightening is completed. Irrespective of the position of the combined rotation circle 360 °, the upstream end of the air flow path of the air brush main body and the secondary space of the air supply valve are connected via the flow path.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. The air brush A shown in FIGS. 1 to 3 has a connection member 2 serving as a connection portion of an air supply hose b screwed into an intermediate portion of an air brush main body 1 formed in a substantially pencil shape using metal such as brass. In addition to being connected and integrated, an air supply valve 3 is provided inside the connection member 2.

The air brush main body 1 has a front portion 1a and a rear portion 1b threadedly connected to each other, and a needle 4 is slidably inserted along an axis inside the main body 1. The tip of the needle 4 is inserted into the nozzle hole 5a of the nozzle 5 provided at the tip of the air brush main body 1, and is constantly urged forward by the repulsive force of the coil spring 14 elastically mounted on the rear inside the main body 1. It is. Further, the needle 4 is engaged with the operating rod 6 provided in the middle portion of the air brush main body 1, and the operating hole 6 is operated so as to be tilted rearward and retracted in the axial direction, so that the nozzle hole 5 a is formed. be opened. Thus, the paint supplied from the paint cup 7 to the nozzle 5 is blown out as fine particles from the nozzle hole 5a together with the ejection of the compressed air.

As described above, the compressed air supplied to the nozzle 5 is introduced from the air supply hose b connected to the connection port 22 at the lower end of the connection member 2 and passes through the air supply valve 3 provided inside the connection member 2. Connection member 2 and air brush body 1
To the nozzle 5 through air supply passages 8a and 8b communicating along the inside of the nozzle.

The operating rod 6 provided at the intermediate portion of the airbrush main body 1 has a shaft 62 protruding from the lower surface of the button 61 inserted through a cutout 11 formed on the upper surface of the airbrush main body 1. A push shaft 63 is connected to the lower end of the shaft portion 62 via a pivot pin 64 so that the push shaft 63 can be bent, and the push shaft 63 is inserted into the upper end opening of the connection member 2 to move the operating rod 6 itself up and down. It is supported so that it can be pushed.

The notch 1 of the air brush main body 1
A tilting plate 12 is provided in 1, and the tip of the tilting plate 12 is brought into contact with the shaft portion 62 of the operating rod 6 from behind. The lower end of the tilting plate 12 is in contact with the front end of a needle chuck 13 that grips the needle 4, whereby when the operating rod 6 is tilted rearward, the movable plate 12 is moved. The needle 4 is configured to be moved rearward through the intermediary.

The connection member 2 connected to the intermediate portion of the airbrush main body 1 is a substantially cylindrical member formed of a metal such as brass similarly to the airbrush main body 1. The connection member 2 has an air supply valve 3 therein, and a male screw portion 21 provided at the upper end of the connection member 2 is screwed into a connection hole 10 formed in a lower surface of an intermediate portion of the air brush main body 1. By doing so, it is detachably connected to the air brush main body 1.

The connecting member 2 is provided with an operating rod 6
And the insertion hole 25 into which the push shaft 63 is inserted.
The valve chamber 3 is formed by extending the connection port 22 at the lower end of the member 2 upward.
1, and an air supply valve 3 described later is provided inside the valve chamber 31.

A valve shaft 32 is inserted through a shaft core in the valve chamber 31. The valve shaft 32 is inserted between a communication hole 35a formed in an upper wall of the valve chamber 31 and a hole 9a formed in a shaft core portion of a set screw 9 screwed into the connection port 22 of the connection member 2. Thereby, it is supported slidably up and down.

The valve shaft 32 has a disc-shaped valve body 34 between
And a ring-shaped packing 34a is fitted on the upper surface side of the valve body 34, and the valve shaft 32 is vertically slid up and down around the communication hole 35a in the upper wall of the valve chamber 31. The seat 35 is configured to be seated from below. A coil spring 36 is elastically mounted between the valve body 34 and the set screw 9 in a compressed state, thereby urging the valve body 34 to be always seated on the upper valve seat 35.

As described above, the valve shaft 32, which is urged upward by the coil spring 36, has its upper end protruding through the communication hole 35a to the fitting hole 25, and is inserted into the fitting hole 25 as described above. Abuts on the lower end of the push shaft 63 of the operating rod 6 inserted from above. That is, by pushing down the push shaft 63 by the pushing operation of the operating rod 6, the valve shaft 32 and the valve body 34 move downward, and the air supply valve 3 is opened.

The set screw 9 screwed into the connection port 22 of the connection member 2 has a hole 9a formed in the center portion thereof.
The individual ventilation holes 9b are notched. Therefore, the air supplied from the air supply hose b connected to the connection port 22 of the connection member 2 flows into the valve chamber 31 from the ventilation hole 9b cut out in the set screw 9, and passes through the air supply valve 3. Then, the air is supplied to the air supply passage 8a in the air brush main body 1 through the fitting hole 25 and the air supply passages 8b and 8c described later.

The outer periphery of the upper end portion of the connecting member 2 is provided with a male screw portion 21 which is screwed into the connection hole 10 of the air brush main body 1 as described above. 23 are formed. A groove 8 serving as an air supply passage is provided at a boundary between the male screw portion 21 and the step portion 23.
The peripheral groove c is communicated with the fitting groove 25 communicating with the secondary side of the air supply valve 3 by a plurality of air supply paths 8b.

The air supply passage 8b is formed so as to be slightly inclined from the fitting hole 25 of the shaft portion of the connecting member 2 toward the concave groove 8c of the outer peripheral portion. Although one air supply path 8b functions, it is preferable to drill a plurality of air supply paths. For example, in the case of the present embodiment, four holes are drilled at regular intervals in the circumferential direction, thereby securing a sufficient flow area and increasing the flow path resistance in the air supply path 8b. Avoided.

In the connection member 2, when the male screw portion 21 is screwed into the connection hole 10 of the airbrush main body 1 and tightening is completed, the groove 8 c is formed along the inside of the airbrush main body 1. It is at the same level as the upstream end of the air passage 8b, and is configured to communicate with each other. That is,
The connection member 2 is configured such that the male screw portion 21 is connected to the airbrush main body 1.
Even if the connecting member 2 stops at any position of the rotating circle 360 ° in a state where the screwing is completed in the connection hole 10 and the tightening is completed, the air supply passage 8a of the air brush main body 1 is formed.
And the air supply passage 8b communicating with the secondary side of the air supply valve 3
Communication is established via the concave groove 8c.

The end face of the step 23 has an O for airtightness.
The ring 24c is fitted. The O-ring 24c connects the male screw portion 21 of the connection member to the connection hole 10 of the airbrush main body 1.
When it is screwed into the inside, it tightly adheres to the airtight surface 15 formed on the outer peripheral portion of the connection hole 10 to maintain airtightness between the joint surfaces 15 and 23.

Further, O-rings 24a and 24b having different diameters are fitted on the end face of the upper end of the connection member 2 in a state where they are concentric. The inner O-ring 24b is the insertion hole 2
The airtightness between the outer periphery of the push shaft 63 and the inner peripheral surface of the fitting hole 25 is maintained by fitting the push shaft 63 of the operating rod 6 into the upper end of the push rod 5. . Also, the outer O
The ring 24a is fitted to the outer side of the O-ring 24b, and when the male screw portion 21 is screwed into the connection hole 10 of the airbrush main body 1, the ring 24a is brought into close contact with the end face 16 at the deepest portion of the connection hole 10 and joined. The airtightness between the surfaces 23 and 16 is maintained.

That is, as described above, in order to connect the air supply passages 8a and 8b to each other, the concave groove 8c provided in the threaded connection portion by the male screw portion 21 and the connection hole 10 is provided with the O-ring 2
Airtightness is maintained by being located in an airtight range sandwiched between 4c and 24a.

When the connection member 2 is screwed into the connection hole 10 of the airbrush main body 1 as described above, the outer peripheral surface of the step 23 of the connection member 2 is in the airtight surface 15 of the connection hole 10. Fits tightly around the circumference with minimal clearance. Therefore, the air brush main body 1 and the connection member 2 are connected in a state in which there is no unnaturalness in appearance.

The air brush A constructed as described above
When the air supply valve 3 is disassembled for maintenance or repair work, the engagement of the male screw portion 21 at the upper end of the connection member 2 is loosened, and the connection member 2 is connected to the air brush main body 1.
, The set screw 9 screwed into the lower end opening of the connection member 2 is removed, the valve shaft 32 is pulled out from the inside of the connection member 2, the air supply valve 3 is disassembled, and each component is inspected. .

The air brush A of the above-described embodiment is
By pressing down, the air supply valve 3 is opened, and the nozzle 5 is opened and closed by tilting the operating rod 6 to increase or decrease the amount of paint to be sprayed. FIG.
The air brush A2 may be employed in a single action type air brush A2.

The air brush A2 shown in FIG. 4 has a connection hole 10 formed in an intermediate portion of the air brush main body 1 which is relatively short, and the air supply valve 3 is provided in the connection hole 10 similarly to the air brush A described above. Is connected by detachable connection by screwing a connection member 2 provided therein.

The air brush A2 is fixed by connecting the rear end of the needle 4 to an adjusting screw 1c screwed and connected to the rear end of the air brush main body 1, and rotating the adjusting screw 1c. The needle 4 is finely adjusted in the axial direction to set the amount of paint sprayed from the nozzle 5 constant. The operating rod 6 'is fitted in the hole 11' and supported so as to be vertically movable, and a push shaft 6 provided at the lower end of the operating rod 6 '.
By depressing the valve shaft 32 of the air supply valve 3 by 3 ′, the air supply valve 3 is opened and compressed air is supplied to the nozzle 5. That is, when the air brush A2 pushes and operates the operating rod 6 ',
A certain amount of paint is ejected from the nozzle 5.

The air brushes A and A2 are formed by the concave grooves 8c provided around the male screw portion 21 of the connecting member 2.
When the tightening stop position of the connection member 2 is stopped at any position of 360 °, the air supply passage 8a on the airbrush main body 1 side is used.
And the air supply passage 8b on the connection member 2 side. However, the concave groove is provided around the inner peripheral side of the connection hole 10 in which the air supply passage 8a is opened, and when the screwing of the connection member is completed, the air supply passage 8b of the connection member 2 is closed. It may be configured so as to communicate with.

Further, the flow path structure of the air supply passage at the screw-fitting portion of the connecting member is not limited to the structure of the above-mentioned embodiment, and when the connecting member is screwed and tightened, the connecting member is rotated 360 degrees. Regardless of the position of ゜, any structure is adopted as long as it can connect the upstream end of the air flow path of the air brush main body and the secondary space of the air supply valve even if it stops at any position. You may.

[0040]

As described above, according to the present invention, an air supply valve is provided inside a connecting member formed separately from the airbrush main body, and the connecting member is provided at a predetermined position of the airbrush main body. The connection member is detachably connected by screwing it into the connection hole, so that the connection member is removed from the air brush body in the same manner as the conventional air brush valve fitting, and the air supply valve installed in the connection member is maintained. Work can be performed smoothly. Further, a fork member such as a conventional airbrush is not required, and the work of connecting the fork member to the airbrush body and welding it with solder or the like is not required, so that labor and cost during manufacturing are greatly reduced. be able to.

In the air brush of the second aspect, when the other end of the connection member is screwed into the connection hole of the air brush body and tightened, no matter where the screwing rotation of the connection member stops. , Because it constitutes a flow path that connects the upstream end of the air flow path of the air brush main body and the secondary space of the air supply valve, so that the threading position and dimensions of the connecting member can be accurately controlled and assembled The communication of the flow path between the connection member and the air brush main body can be easily performed without performing the adjustment work during the work.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an air brush embodying the present invention.

FIG. 2 is an enlarged vertical sectional view showing a connecting part of the air brush.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a longitudinal sectional view showing a single action type air brush.

FIG. 5 is a longitudinal sectional view showing a conventional air brush.

[Explanation of symbols]

 A: air brush b: air supply hose 1: air brush main body 10: connection hole 2: connection member 3: air supply valve 6: operating rod 8a, 8b ...・ Supply path 8c ・ ・ ・ Concave groove

Claims (2)

[Claims] An air supply valve is opened by operating an operating rod provided on the air brush main body, and compressed air from an air supply source is introduced into the air brush main body. In an air brush for spraying a liquid paint together with the compressed air from a nozzle, the air supply valve is provided inside a substantially cylindrical connection member formed separately from an air brush main body, and a primary side of the air supply valve is provided. A state in which a compressed air introduction port is provided at one end of the connection member to be compressed, and the other end of the connection member serving as the secondary side of the air supply valve is kept airtight in a connection hole provided at a predetermined position of the air brush main body. An air brush, which is screwed to communicate with an upstream end of an air flow path communicating with a nozzle, and which connects a valve body of an air supply valve provided in a connection member and the operating rod. 2. When the other end of the connection member is screwed into a connection hole of the airbrush main body and tightened, no matter at which position of the screwing rotation the connection member stops, the airbrush main body side can be used. 2. The airbrush according to claim 1, wherein the airbrush comprises a flow path for communicating an upstream end of the air flow path with a secondary space of an air supply valve on a connection member side.