JPH0563659U - Hand gun - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a handgun that can easily operate an on-off valve device with a simple structure. [Composition] A normally closed on-off valve device that is closed by a spring is adopted as an on-off valve device provided upstream near the nozzle at the tip so that the valve element is opened by a pneumatically actuated actuator. Pressurized air is supplied and discharged by opening and closing a normally-closed type start instruction valve provided in the grasping part of the hand gun, and the start instruction valve tends to be closed by the pressure of the supplied pressurized air. It is characterized by having done.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a so-called hand gun such as a hand-held spray gun for spraying a liquid such as paint and a hand-held sealer flow gun for discharging a sealant. It concerns a type of handgun that is adapted to be operated.

[0002]

[Prior Art]

 Conventional hand-held airless spray guns, air spray guns, flow guns, and other so-called handguns are equipped with a normally-closed on-off valve device that is closed upstream of the nozzle by a relatively strong spring. A structure in which this on-off valve device is opened by a trigger against the spring is often used. Also, in so-called automatic guns applied to painting robots, etc., the valve body of a normally closed on-off valve device that is closed by a spring is driven by a pneumatically actuated actuator to supply and discharge pressurized air to and from the actuator. The switching is performed by an electromagnetic switching valve provided at a position separated from the automatic gun.

[0003]

[Problems to be solved by the device]

Since the conventional handgun described above needs to reliably close the pressurized fluid of several to several hundred tens kg / cm ² supplied from the upstream in the normally closed on-off valve device, it is relatively strong as a spring for closing. Therefore, it is necessary to operate the trigger with your fingertips strongly against the spring.If you frequently operate the trigger, or keep the trigger pulled. However, there is a serious defect in that the operator's finger load is extremely severe, and as a result, the operator is easily affected by tendonitis. Although it is possible to apply the configuration of the automatic gun to a hand gun, the electromagnetic on-off valve is specially installed in the hand gun itself, which not only complicates the structure but also significantly increases the weight and further increases the electrical equipment. Since it is added, there is a disadvantage that a flameproof structure must be adopted in consideration of the case where the applied fluid is flammable.

Therefore, an object of the present invention is to provide a hand gun that can easily operate the on-off valve device with a simple structure.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention uses a pneumatically-actuated actuator to open the valve body of a normally-closed on-off valve device that is closed by a spring, and also supplies and discharges pressurized air to and from an actuator. The normally-closed type start indicator valve provided in the grasping part in Fig. 2 is opened and closed, and the start indicator valve is one that tends to be closed by the pressure of the supplied pressurized air. Is.

[0006]

[Action]

When the hand gun is in the resting state, the start indicator valve is closed to the self-holding state by the pressurized air without being operated and air is not supplied to the actuator, so the on-off valve device is closed by the spring and the fluid from the nozzle is closed. There is no eruption or outflow. On the other hand, when pressurized air is supplied to the actuator by operating the start instruction valve, the opening / closing valve device that was closed by the spring opens and the liquid jets or flows out from the nozzle. The start indicator valve tends to be closed by the supplied pressurized air, but the pressurized air supplied to the actuator is usually at a relatively low pressure of several kg / cm ² or less, and the valve of the start indicator valve is Since the pressure receiving area of the body is small, the start instruction valve opens with a slight operating force that opposes the pressing force of the pressurized air against the valve body, and when the valve is open, it is applied to the front and back of the valve body. Since compressed air acts, the valve open state is maintained by maintaining a slight operating force on the start instruction valve.

[0007]

【Example】

 Hereinafter, a detailed description will be given of the illustrated embodiment in which the present invention is applied to a handgun for airless spraying. As a handgun for airless spraying to which the present invention is applied, for example, as shown in the figure, a gun base A is generally provided, and an atomizing head B and a valve actuating part C which are provided in front of and behind the gun base A, respectively. It consists of a gun base A and a gripping part D connected to the valve starting part C. The gun base A is provided with a valve chamber 1 near the front end, and at the tip of this valve chamber 1 there is a valve seat 2 and this valve seat 2 An opening / closing valve device 4 consisting of a valve body 3 which opens and closes by advancing and retracting is provided, a flow path 5 for supplying a spray liquid is provided in the valve chamber 1, and the atomizing head B is provided in front of the valve seat 2. An orifice type jet nozzle 6 is generally provided, and a cylinder 7 is provided in the valve starting portion C, and a piston 8 is provided in the cylinder 7 by a spring 9 so as to always keep a forward movement. And the piston 8 Connects the valve body 3 to configure the on-off valve device 4 as a normally closed type by a spring 9, and the grasping portion D is provided with a ventilation passage 10 for supplying pressurized air to the cylinder 7, and the flow A spray liquid supply source 11 and a pressurized air supply source 12 are separately connected to the passage 5 and the air passage 10, respectively. Then, the piston 8 and the valve body 3 connected to the piston 8 are retracted to open the on-off valve device 4, and a model in which spraying can be performed from the nozzle 6 is adopted.

As a special configuration of the present invention with respect to the above-mentioned type, in the embodiment of FIGS. 1 to 3, the normally closed start instruction valve 13 in which the ventilation passage 10 in the grasping section D is opened and closed by an operation with a fingertip. As a specific structure of the start instruction valve 13, a part of the air passage 10 is formed in the longitudinal axis and a valve chamber 14 is provided there, and the valve chamber 14 is directed upstream. The valve seat 15 corresponding to the valve seat 15 is provided so as to be driven by the push button type operation part 16 in contrast to this, but in this embodiment, the operation part 16 and the valve An indicator valve member 19 which is connected to the body 17 by a small-diameter valve rod 18 is provided, and the operating portion 16 of the indicator valve member 19 projects to the upper front end of the grasping portion D 1, and the valve body 16 is attached to the valve seat 15. Set it in a state where it can be easily contacted, and If necessary, it is desirable to provide a weak spring 20 inside the valve chamber 14 behind the valve body 17 and acting to tend to close the valve body 17 easily.

The operation sequence will be described based on the above-described configuration. In FIGS. 1 and 2, the pressurized air from the pressurized air supply source 12 is stored in the valve chamber 14 of the start instruction valve 13 in the rest state. It is being supplied, the valve body 17 is pressed against the valve seat 15 by air pressure, and the start instruction valve 13 is closed. Therefore, pressurized air is not supplied to the cylinder 7, and the piston 9 and the The opening / closing valve device 4 is closed while keeping the valve body 3 connected to the forward direction in a forward state, and the spray liquid from the spray liquid supply source 11 is not ejected from the nozzle 6. At the time of starting, the operating portion 16 of the start instruction valve 13 is pressed against the spring 20 and the air pressure in the valve chamber 14 by the fingers holding the grasping portion D to open the start instruction valve 13, as shown in FIG. Pressurized air is supplied from the pressurized air supply source 12 to the cylinder 7 to resist the spring 9 and retract the piston 8 and the valve body 3 connected thereto to open the on-off valve device 4. As a result, the spray liquid is sprayed from the nozzle 6.

It is possible to continue spraying from the nozzle 6 by continuing to push the operating portion 16. However, not only is the weak spring 20 adopted, but the front and back sides of the valve body 17 are both of the same pressure. Due to the fact that the valve rod 18 is pressed by the pressurized air and the valve rod 18 has a small diameter, the pressing force for continuously pressing the operating portion 16 is extremely small, and even when the operating portion 16 is frequently pressed. Only a light pressure is required, and therefore, despite the long hours of work, the fatigue of the fingers is minimized and the worker is not affected by tendonitis.

The air passage 10 close to the cylinder 7 communicates with the outside air through a small gap between the sliding portion of the operating portion 16 and the mounting screw portion, and the pressurized air to the cylinder 7 will leak when the spray is started. Therefore, in order to prevent this, the indicator valve member 19 is provided with another valve body 21 that faces the valve body 17, while the valve seat 22 is provided so as to be back-to-back with the valve seat 15. Therefore, in the activated state in which the operating portion 16 is pressed, the valve body 21 is pressed against the valve seat 22 to prevent air from leaking from the vicinity of the operating portion 16 and, on the contrary, to stop the spraying, the operating portion 16 is stopped. When the pressing is released, it is desirable to separate the valve body 21 from the valve seat 22 so that the pressurized air in the cylinder 7 is released to the outside air.

In addition to the above, it is convenient to attach a device for preventing the gun from being activated by an erroneous operation on the operation section 16 in the rest state, which is why the operation section 16 is swung inside the push button. It is preferable to pivotally support the fan-shaped lock member 23 that moves forward and backward by the movement by a pin 24, and to provide a stopper 25 that restricts the turning of the lock member 23, thereby locking the lock member 23 as shown in FIGS. The operation part 16 is prevented from being pushed in while the member 23 is advanced to the inside of the push button in the operation part 16, and on the contrary, the lock member 23 is pushed in the operation part 16 as indicated by the chain line in the figure. The operation unit 16 can be pushed in under the condition that it is retracted from the inside of the button.

The operation section 16 of the activation instruction valve 13 may be a trigger instead of a push button type. For example, as shown in FIGS. 4 and 5, the grasping section D is the main section D1 and this main section. A valve portion D2 is provided continuously behind the upper end of D1, and the flow path 5 for supplying the spray liquid is provided so as to extend vertically through the main portion D1. In addition, a start instruction valve 13 is provided in the valve portion D2. In addition, while extending the front end of the indicator valve member 19 in a bifurcated manner, the trigger die operating portion 16 is pivotally attached to the base portion A at its base end portion by the pin 26, and the middle portion of the indicator valve member 19 is fixed. The indicator valve member 19 is pushed in by the trigger die operating portion 16 so as to correspond to the bifurcated tip portion, and other structures are the same in nature as those in the above-mentioned embodiment. , Same department The same numerals are given to the minutes and the description thereof will be omitted.

[0014]

[Effect of the device]

 As described above, according to the present invention, the following effects can be obtained. (A) Since the valve body of the normally closed on-off valve device that is closed by a spring is opened by a pneumatically actuated actuator, even when a strong spring is used for closing, it can be started by fingers. It is not necessary to directly oppose a strong spring for operation. (B) The workability is improved because the pressurized air is supplied to and discharged from the actuator for opening and closing the on-off valve device according to the opening and closing of the normally-closed start instruction valve provided in the grasping part of the hand gun. (C) Since the start-up instruction valve is configured to tend to be closed by the pressure of the supplied pressurized air, this makes it possible to perform the pressing operation with fingers remarkably lightly, thus reducing operator fatigue. It is reduced to prevent tendonitis and the like. (D) Since the manual type is adopted as the start instruction valve without using the solenoid valve, the structure can be made simple and lightweight, and the flammable liquid can be easily applied.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a handgun in a rest state according to an embodiment of the present invention.

FIG. 2 is a front view of a start instruction valve portion in a rest state.

FIG. 3 is a partially cutaway side view showing an activated state of the hand gun.

FIG. 4 is a partially cutaway side view of a handgun in a rest state according to another embodiment.

5 is a cross-sectional plan view taken along the line VV in FIG.

[Explanation of symbols]

 3 valve body 4 on-off valve device 6 nozzle 9 spring 10 air passage 13 start indicator valve 14 valve chamber 15 valve seat 16 operation part 17 valve body 18 valve stem 19 indicator valve member D grasping part

Claims (1)

[Scope of utility model registration request] 1. A normally closed type on-off valve device (4) which is closed by a relatively strong spring (9) at an upstream end near a nozzle (6), and a valve element (4) of this on-off valve device (4). 3) is driven by a pneumatically actuated actuator to open the valve, and the supply / discharge of pressurized air to / from the actuator is of a normally-closed type provided in a ventilation path (10) of a grasping portion (D) of a hand gun. The start instruction valve (13) is opened and closed, and the start instruction valve (13) is used.
As a part of the ventilation passage (10) is formed in the longitudinal axis, a valve chamber (14) is provided therein, and the valve chamber (14) is provided.
Is provided with an upstream valve seat (15), and on the other hand, an indicator valve member (19) having a valve body (17) corresponding to the valve seat (15) and a small diameter valve rod (18) extending forward is provided. An operating part for providing the valve body (17) with a tendency to easily come into contact with the valve seat (15) by the pressure of the pressurized air supplied to the valve chamber (14) and for driving the indicator valve member (19). A handgun characterized in that (16) is provided in a state of being interlocked with an indicator valve member (19) under a state of being positioned in front of a grasping section (D).