JP7055265B2 - Fluid gun - Google Patents

Description

The present invention relates to a fluid gun that injects a fluid such as air onto a work or the like of a machine tool.

Conventionally, an air gun as described in Patent Document 1 has been known. This air gun consists of a barrel portion and a grip portion, and has a configuration in which compressed air is ejected from an injection nozzle at the tip. The user grasps such an air gun and injects compressed air ejected from an injection nozzle onto an injection target such as a workpiece in order to remove chips and dust adhering to the workpiece obtained by processing. do.

Japanese Unexamined Patent Publication No. 11-28395

However, according to the above-mentioned conventional air gun, since the barrel portion provided with the injection nozzle is fixed, the air is diffused when the air is ejected to a place that is difficult for the user to reach. There was a problem that chips and the like could not be sufficiently removed. Also, in the case of an air gun with a long barrel (nozzle), when blowing air to a place near the user, it is necessary to take an unreasonable posture such as pulling the hand holding the air gun behind. There was a problem. The present invention has been made to solve such a problem.

The fluid gun according to the present invention has a substantially cylindrical main body having an air introduction port for introducing air inside, and is retractably retractable in the axial direction by the pressure of air introduced from the air introduction port inside the main body. The extension pipe is provided with a nozzle provided at the tip of the extension pipe.

Further, a valve device for adjusting the introduction of air is provided between the main body and the extension pipe, and the valve device may have a valve inside and may be mechanically interlocked with a trigger provided in the main body. .. Further, a rocker arm is provided between the trigger and the valve, the swing end of the trigger abuts on the swing end of the rocker arm, and a member mechanically interlocked with the valve abuts on the middle of the rocker arm. It may be a structure that has been made.

Further, the fluid gun has a release mechanism having a lock pin that engages with the extension pipe that holds the extension pipe in a retracted state inside the main body, and a release button that is mechanically connected to the lock pin. However, the release button constitutes a continuous surface with the trigger to form a lever-like appearance.

Further, it is preferable that the extension pipe has an elliptical cross section in the direction orthogonal to the axial direction.

It is a side view which shows the air gun which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the nozzle extension state of the air gun shown in FIG. It is sectional drawing which shows the internal structure of the air gun shown in FIG. It is a perspective view of the air gun shown in FIG. It is an assembly drawing of the air gun shown in FIG. It is explanatory drawing which shows the operation by a trigger. It is an enlarged view which shows the lock mechanism.

FIG. 1 is a side view showing an air gun according to the first embodiment of the present invention. FIG. 2 is an explanatory diagram showing a nozzle extension state of the air gun shown in FIG. FIG. 3 is a cross-sectional view showing the internal structure of the air gun shown in FIG. FIG. 4 is a perspective view of the air gun shown in FIG. The air gun 100 is composed of a main body 101 having a substantially tubular shape that can be grasped by hand, and extension pipes 14 and 15 provided on the main body 101 so as to be expandable and contractible.

The main body 101 is configured by combining an upper main body cover 1 and a lower main body cover 2 which are vertically divided in the longitudinal direction. Inside the main body 101, a base pipe 13 is provided in the axial direction. Inside the base pipe 13, the first extension pipe 14 is retractably stored and arranged, and further, inside the first extension pipe 14, the second extension pipe 15 is retractably stored and arranged. A nozzle 7 is provided at the tip of the second extension pipe 15 with the packing 32 interposed therebetween. At the tips of the main body 101 and the base pipe 13, a pipe stopper 5 for limiting the extension position of the first extension pipe 14 is provided. A cap 6 is provided at the tip of the pipe stopper 5.

The tip surface of the nozzle 7 is inclined at a constant angle with respect to the axial direction of the first extension pipe 14. An air ejection port is provided on the inclined surface of the nozzle 7 (not shown). At the rear end of the first extension pipe 14, a pair of arc-shaped sliders 8 are provided, and a packing 29 for maintaining airtightness with the base pipe 13 is provided. Further, a slide bush 10 is provided on the rear end edge. A pair of arc-shaped sliders 9 are provided at the rear end of the second extension pipe 15. Further, at the rear end of the second extension pipe 15, a packing 30 for maintaining the airtightness with the first extension pipe 14 is provided. Further, a lock hook 21 that is fitted to the tip cap 6 and temporarily fixes the second extension pipe 15 is provided on the rear end edge. The lock hook 21 is a cap-shaped member having a recess in the circumferential direction.

The base pipe 13, the first extension pipe 14, and the second extension pipe 15 each have an elliptical cross section in the direction orthogonal to the axial direction. Therefore, the shape itself serves as a linear guide, and the direction of the nozzle 7 does not change in the circumferential direction during the expansion / contraction operation. Furthermore, since it is not necessary to provide a groove for a guide such as a spline, the appearance design becomes neat.

At the rear end of the base pipe 13, a coupler 35, which is an air introduction port for introducing air into the inside, is provided. A pump, which is an air supply source (not shown), is connected to the coupler 35 via a hose. A valve device 102 is provided between the coupler 35 and the base pipe 13. In the valve device 102, the spring seat 24, the spring 33, the valve 23, and the valve rubber 31 are arranged on the axis line, the shaft of the valve 23 penetrates the inside of the valve holder 16, and the slide ball 11 is provided at the end edge thereof. .. The valve holder 16 is arranged inside the valve cylinder 103 formed at the rear end of the base pipe 13. The spring seat 24 abuts on the ceiling inside the valve cylinder 103, and the valve 23 is urged to the end edge of the valve holder 16 by the spring 33 between the flange of the valve 23 and the spring seat 24 to close the valve. The axis of 23 is moved in the axial direction by pushing the slide ball 11. As a result, the collar of the valve 23 and the end edge of the valve holder 16 are separated from each other, and the valve 23 opens.

A rocker arm 26 is arranged so as to be swingable in the vicinity of the valve holder 16. The trigger 3 is pivotally supported on the side surface of the base pipe 13 so as to abut on the tip of the rocker arm 26. The trigger 3 has a long distance from the shaft to the swinging end so that it can be gripped by two or three fingers, and the surface touched by the fingers has a curved surface to give a fit. The swing end of the trigger 3 abuts on the swing end of the rocker arm 26, and when the trigger 3 is pushed in, the rocker arm 26 swings and the slide ball 11 abutting on the middle of the rocker arm 26 is said. The shaft of the valve 23 is pushed up, which opens and closes the valve 23. That is, the trigger 3 and the valve 23 of the valve device 102 are in a mechanically interlocked state, and a member such as a slide ball 11 mechanically interlocked with the valve 23 comes into contact with the middle of the rocker arm 26. A roller 37 is provided at the swing end of the trigger 3 so as to be in smooth contact with the rocker arm 26.

The outer surface of the rocker arm 26 from the portion of the rotation shaft serving as a fulcrum has a substantially half-arc-shaped curved surface, and its swing end portion is in contact with the roller 37. Further, the inner surface with which the slide ball 11 abuts is also a curved surface having a substantially arc shape. Specifically, the curved surface as the outer surface and the inner surface is a substantially curved surface as a whole with three planes continuously at a predetermined angle. On the other hand, since the roller 37 of the trigger 3 swings around the fulcrum of the trigger 3, the roller 37 abuts on the outer surface of the rocker arm 26 while moving toward the tip end.

As a result, as shown in FIG. 6A, in the initial state, the roller 37 is in contact with the vicinity of the tip of the rocker arm 26. When the trigger 3 is gripped in this state, as shown in FIG. 6B, the roller 37 pushes up the end portion of the rocker arm 26, whereby the nozzle 23 moves in the axial direction via the slide ball 11. Further, when the trigger 3 is grasped and pushed in, the rocker arm 26 is pushed up by the roller 37 and the nozzle 23 further moves in the axial direction via the slide ball 11 as shown in FIG. 6 (c). Here, since the rocker arm 26 has a substantially arc shape as a whole, the roller 37 comes into contact with the rocker arm 26 slightly inward from the tip of the rocker arm 26 at the start of gripping from the initial state of the trigger 3, of the rocker arm 26. It acts to increase the amount of sway. Therefore, since the opening of the valve 23 becomes large, the air flow rate can be greatly changed until the rocker arm 26 starts to be gripped. Therefore, in the initial stage of air ejection, it becomes easy to adjust the amount of air ejection.

After that, when the rocker arm 26 is further gripped, the roller 37 moves toward the tip of the rocker arm 26 and the outer surface of the rocker arm 26 is tilted at a predetermined angle. The amount of movement of the valve 23 becomes smaller, and the opening of the valve 23 becomes smaller. Therefore, in a state where the trigger 3 is strongly gripped (from immediately before the normal use state to the use state), the change in the amount of air ejected depending on the grip condition of the trigger 3 is small. Therefore, the amount of air ejected is stable when the air is ejected while actually being held.

At the lower part of the main body 101, a release structure 104 of the first extension pipe 14 and the second extension pipe 15 is provided. A release seesaw 25 is arranged on the side surface of the base pipe 13. The release seesaw 25 has a size that can be stored inside the trigger 3. It is pivotally supported by the base pipe 13 at substantially the center, and a hook 25a is provided at one end. A release button 4 is provided at the other end, and when the release button 4 is pressed, the hook 25a swings around the axis and the hook 25a moves downward. The hook 25a is mechanically connected to the release mechanism 104 described later. The release button 4 has a shape that forms a continuous surface with the trigger 3, and has an appearance like a lever when the trigger 3 and the release button 4 are continuously arranged. More specifically, when the main body 101 is grasped, the release button 4 can be operated with the index finger, and the trigger 3 can be operated with the middle finger or the like, which enables one-handed operation of air injection and extension of the nozzle 7. ..

The release mechanism 104 is assembled by arranging and assembling the air packing 36, the holder 19, the lock pin 22, the spring 34, the slider ring 12, and the cap 20 on the shaft. The lock pin 22 penetrates inside the base pipe 13. The cap 20 is engaged with the hook 25a of the release seesaw 25. The lock hook 21 engages with the lock pin 22 and holds the second extension pipe 15 in a degenerate state. When the second extension pipe 15 is held in the degenerate state, the first extension pipe 14 is also locked to the nozzle 7 and stored in the main body 101 in the degenerate state. Further, when the lock pin 22 and the lock hook 21 are disengaged, the extension pipes 14 and 15 are released and are in the released state.

Further, as shown in the cross-sectional view of FIG. 7, with the first extension pipe 14 and the second extension pipe 15 housed in the base pipe 13, the rear end of the first extension pipe 14 is the rear end of the base pipe 13. The end face is in contact with the slide bush 10 via the slide bush 10, the rear end of the second extension pipe 15 is in contact with the slide bush 10 via the packing 30, and the lock hook 21 protrudes from the rear end of the first extension pipe 14. It comes to be located near the rear end of the base pipe 13 and engages with the tip of the lock pin 22 of the release mechanism 104 provided at the rear end at the groove around it.

The lock hook 21 is hollow and communicates the inside and the outside of the second extension pipe 15. Therefore, as shown in the cross-sectional view of FIG. 7, the passage connected from the valve device 102 and the inside of the second extension pipe 15 can be connected substantially continuously. Further, in the state where the pipe is stored, the slide bush 10 and the packing 30 make it difficult for air to enter the gap between the base pipe 13, the first extension pipe 14, and the second extension pipe 15.

The lower body cover 2 is provided with a hole 105 that exposes the trigger 3 and the release button 4 to the outside of the body 101. Each of the above parts is made of resin, rubber or the like, but may be manufactured of a lightweight metal such as aluminum if necessary. As shown in FIG. 4, the entire main body 101 has a stick shape. The rear end of the upper body cover 1 has a ducktail shape so that it fits in a gripped state.

Next, the operation of the air gun 100 will be described. When the main body 101 is held in the state shown in FIG. 1 (degenerate state of the extension pipes 14 and 15) and the trigger 3 is pushed into the main body 101, the rocker arm 26 swings inside the main body 101 and pushes the slide ball 11. This opens the valve 23. As a result, the air supplied from the air hose connected to the coupler 35 is introduced into the base pipe 13 via the valve device 102, and the lock hook 21 at the end of the second extension pipe 15 is open, which is the valve device. Since it is continuously connected to 102, the introduced air is guided into the second extension pipe 15 and ejected from the nozzle 7.

Since the tip of the nozzle 7 is provided with a predetermined angle, air is ejected slightly downward from the axial direction of the main body 101. Further, the valve 23 can be opened and closed depending on how the trigger 3 is pulled to adjust the flow rate. Further, since the rocker arm 26 is interposed between the trigger 3 and the valve 23, the trigger 3 can perform a fine opening / closing operation of the valve 23 by the principle of leverage.

Next, when the release button 4 is pressed, the release seesaw 25 swings to push down the lock pin 22, and the lock pin 22 and the lock hook 21 are disengaged. When the trigger 3 is gripped and air is supplied in this state, the second extension pipe 15 is extended by the pressure of the air and the first extension pipe 14 is also extended by the pressure of the air. The first extension pipe 14 extends to a predetermined position by the pipe stopper 5, and the lock hook 21 of the second extension pipe 15 extends to the tip of the first extension pipe 14 and stops. As a result, as shown in FIG. 2, the pipe is extended and the position of the nozzle 7 is extended toward the tip end. As described above, since the first extension pipe 14 and the second extension pipe 15 are extended by the pressure of the air, no special power source is required.

By extending the nozzle 7 of the air gun 100, it is possible to inject air into a place that is difficult to reach as it is, such as a high place. That is, the expansion and contraction of the nozzle 7 widens the area where air can be reliably injected to the injection target. Further, when injecting air to a nearby place, the nozzle 7 may be retracted.

When the nozzle 7 is degenerated, the user pushes the tip of the second extension pipe 15 into the main body 101 together with the first extension pipe 14. As a result, the lock pin 22 is engaged with and fixed to the lock hook 21, and the first extension pipe 14 and the second extension pipe 15 hold the degenerate state.

In the present embodiment, the air gun 100 is exemplified as the present invention, but it can also be used as a water gun for ejecting water.

100 Air gun 101 Main body 102 Valve device 104 Release mechanism 1 Upper main body cover 2 Lower main body cover 3 Trigger 4 Release button 5 Pipe stopper 6 Cap 7 Nozzle 13 Base pipe 14 First extension pipe 15 Second extension pipe 21 Lock hook 22 Lock pin 23 Valve 25 Release Seesaw 26 Rocker Arm

Claims (5)

A substantially cylindrical body with an air inlet that introduces air inside,
An extension pipe housed inside the main body so that it can be extended in the axial direction by the pressure of the air introduced from the air introduction port.
The nozzle provided at the tip of the extension pipe and
A release structure is provided between the main body and the extension pipe, and the release structure includes a release mechanism for switching from an engaged state between the main body and the extension pipe to a released state by a release button provided on the main body.
A fluid gun characterized by being equipped with. A valve device for adjusting the introduction of air is provided between the main body and the extension pipe.
The fluid gun according to claim 1, wherein the valve device has a valve inside and is mechanically interlocked with a trigger provided in the main body. A structure in which a rocker arm is provided between the trigger and the valve, the swing end of the trigger is in contact with the swing end of the rocker arm, and a member mechanically interlocked with the valve is in contact with the middle of the rocker arm. The fluid gun according to claim 2, wherein the fluid gun has. The release mechanism has a lock pin that engages with the extension pipe that holds the extension pipe in a retracted state inside the main body, and also has a release button that mechanically connects to the lock pin.
The fluid gun according to claim 2 or 3, wherein the release button constitutes a continuous surface with the trigger to form a single lever-like appearance. The fluid gun according to any one of claims 1 to 4, wherein the extension pipe has an elliptical cross section in a direction orthogonal to the axial direction.

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