Grip for water jet gun

Abstract

To provide a grip for a water jet gun which allows a worker to recognize safety (danger) associated with switching between a jetting state and a non-jetting state of a water jet and achieves a high level of safety and high maintainability as a device structure.SOLUTION: A grip for a water jet gun includes: a first safety mechanism S1 comprising a lever 3 for switching a state of a water jet between a jetting state and a non-jetting state, an engagement part 4 connected to the lever 3, and a patch 2a which comes into contacts with the engagement part 4 to restrain movement of the lever 3 when the water jet is not jetted; and a second safety mechanism S2 comprising a receiving part 6 disposed at the lever 3, and a piston 5 which presses the receiving part 6 when the water jet is not jetted.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a grip for a water jet gun. [Background technology]

[0002] Conventionally, when demolishing or removing concrete or asbestos-containing walls, water jets are used to peel or chip off part or all of the surface. For such work, a gun or a device that sprays water jets inside a cylindrical case is used.

[0003] For example, Patent Document 1 discloses a high-pressure spray gun that is equipped with two trigger levers and ensures safety by switching a swinging member disposed inside. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 62-286568 Summary of the Invention [Problem to be solved by the invention]

[0005] In the aforementioned Patent Document 1, the water jet is switched between ejection and non-ejection by changing the degree of expansion and contraction of various springs when the grip is open or closed, and the oscillating member that performs the switching is located inside the device. This makes it difficult for workers to visually determine the risk. Another issue is that to eliminate the risk of damage to the device, the springs, oscillating members, etc. must be replaced early.

[0006] When using a gun-type device, there is a risk that the worker may come into direct or indirect contact with the water jet sprayed from the nozzle of the gun. Although safety training is provided when using water jets and safety measures are implemented for the device itself, unexpected accidents still occur occasionally in the industry, and there has been a demand for a mechanism with even greater safety.

[0007] Therefore, the objective of this invention is to provide a grip for a water jet gun that allows the operator to recognize the safety (risk) of switching between water jet injection and non-injection, and whose device structure is also safe and highly maintainable. [Means for solving the problem]

[0008] A first aspect of the present invention is a first safety mechanism including a lever for switching between water jet ejection and non-ejection, a locking part connected to the lever, and a backing plate that contacts the locking part to restrict movement of the lever when the water jet is not ejected; a second safety mechanism including a receiving portion disposed on the lever and a piston that presses the receiving portion when the water jet is not ejected; A grip for a water jet gun.

[0009] The lever may have a pivot shaft that supports the engaging portion so that it can swing freely, and an elastic body that biases the engaging portion so that it protrudes toward the backing plate.

[0010] The piston is divided into a front piston that contacts the receiving part when the water jet is ejected, and a rear piston that is positioned on the opposite side of the receiving part relative to the front piston, and the facing surfaces of the front piston and the rear piston may have protrusions. The front piston and the rear piston are arranged in series. The front piston and the rear piston contact each other via the protrusions. A gap is secured between the front piston and the rear piston around the protrusions.

[0011] For specific configuration examples of water jet gun grips, a main body having an internal space into which the front piston and the rear piston are inserted, an air supply hole opening into the internal space, and an air discharge hole for discharging air that has flowed out of the internal space; a flow path that communicates the internal space with the air discharge hole when the front piston is pressed by the receiving portion; It may also include:

[0012] The rear piston may have an opposite end to the front piston that protrudes outside the body, so that the front piston can be pressed from the outside via the rear piston. [Effects of the Invention]

[0013] The first safety mechanism allows the operator to recognize the safety (risk) of switching between water jet spray and non-spray. The second safety mechanism stops water jet spray when the lever is released. The first and second safety mechanisms provide a highly safe and easy-to-maintain grip for water jet guns. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a side view of the grip for a water jet gun according to the present embodiment when the water jet is not being ejected; [Figure 2] FIG. 1 is a side view of the grip for a water jet gun according to an embodiment of the present invention when a water jet is being ejected. [Figure 3] Cross-sectional view showing the internal structure of the second safety mechanism when the water jet is not ejecting [Figure 4] A cross-sectional view showing the internal structure of the second safety mechanism when the water jet is ejected. [Figure 5] Cross-sectional view showing air flow to the pressure relief hole when the water jet is not firing [Figure 6] Cross-sectional view showing the rear piston being pushed in from the outside BEST MODE FOR CARRYING OUT THE INVENTION

[0015] Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0016] (Water jet gun grip configuration) The water jet gun grip 1 of this embodiment has a water jet gun 20 built in and is used to treat a work target W, such as a concrete or asbestos-containing wall surface. The water jet gun grip 1 has a main body 2, a lever 3, a locking portion 4, a piston 5, a receiving portion 6, and a safety guard 7.

[0017] The main body 2 is connected to the water jet injection mechanism and is a base on which the operator holds the water jet gun 20. The water jet gun 20 is connected horizontally to the upper part of the main body 2. The lower part of the main body 2 is slightly inclined so that the operator can hold the main body 2 and lever 3.

[0018] Lever 3 is used to switch between water jet injection and non-injection. Lever 3 is fixed to a pivot support part 2b above main body 2. Lever 3 has a locking part 4 located near the center and a receiving part 6 located above. Furthermore, a bent portion 3a is formed below the lever 3 to make it easier for the operator to grip. It is desirable that the bent portion 3a bends so that it spreads outward, but the angle of bending can be adjusted as appropriate.

[0019] The first safety mechanism S1 is a specific mechanism for switching between water jet injection and non-injection, and is composed of a locking portion 4 and a backing plate 2a. The locking portion 4 is composed of a linear elastic body 4a and a pivot 4b. When the water jet is not being injected, the locking portion 4 is maintained in a nearly horizontal position by the force of the elastic body 4a, and is in contact with the backing plate 2a. When the locking portion 4 is in contact with the backing plate 2a, the lever 3 cannot be pulled. When spraying the water jet, the operator moves the engaging portion 4 to release it from contact (support) with the backing plate 2 a, and then grips the lever 3 .

[0020] The piston 5 functions as a second safety mechanism S2, switching the water jet between ejection and stop. After the operator releases the first safety mechanism S1, the operator grasps the lever 3, causing the receiving part 6 to press the piston 5, thereby ejecting the water jet. When the operator releases the lever 3, the piston 5 is pushed back by the reaction force of an elastic member, compressed air, etc., thereby stopping the water jet from being ejected.

[0021] The piston 5 may be composed of a front piston 5a and a rear piston 5b. The front piston 5a and the rear piston 5b are disposed in an internal space 8 formed in the main body 2. When the water jet is not being ejected, air supplied from an air supply source (not shown) flows into the internal space 8 from the air supply path A through the air supply hole 10a. As a result, the front piston 5a moves forward and the rear piston 5b moves backward. The air supply path A communicates with the air supply hole inlet 10b and constantly pressurizes the internal space 8.

[0022] The internal space 8 is sealed by a sealing portion 9. The sealing portion 9 holds the rear piston 5b. The sealing portion 9 is attached to the main body 2 via a screw. Maintenance of the internal space 8 and the piston 5 can be performed by removing the sealing portion 9, resulting in excellent maintainability. The end of the rear piston 5b protrudes from the sealing portion 9. Pressing the rear piston 5b from the outside stops the water jet. An end cap 5c is attached to the end of the rear piston 5b to prevent the piston from being pressed. The end cap 5c is attached not only to make it easier to press the rear piston 5b, but also to make it easier to forcibly block the flow of air into the air discharge hole 11a when using the water jet gun 20 by pressing the end cap 5c. To achieve this forced blocking, it is necessary to avoid situations where the end cap cannot be pressed unexpectedly. Therefore, the surface shape of the end cap 5c can be tapered or a cover or other suitable cover can be attached to the periphery to prevent the intrusion of surrounding debris. In addition, materials such as rubber and resin may be used to improve the feel of the end cap 5c on the worker's skin.

[0023] The side peripheral surface of the front piston 5a has a groove-shaped flow path 5aa for discharging air from the internal space 8. By adjusting the position of the flow path 5aa, the air flow can be switched according to the movement of the front piston 5a. The flow path 5aa is positioned so as to be away from the internal space 8 when the front piston 5a is in the advanced state. The flow path 5aa is positioned so as to enter the internal space 8 when the front piston 5a is in the retracted state.

[0024] The main body 2 is formed with an air discharge hole 11a and a pressure relief hole 12. Neither the air discharge hole 11a nor the pressure relief hole 12 reaches the internal space 8. The air discharge hole 11a has the function of switching between water jet injection and non-injection. The air discharge hole 11a is positioned so that it is always in communication with the flow path 5aa of the front piston 5a. The air discharge hole 11a extends from the circumferential surface of the front piston 5a toward the side of the main body 2, but changes direction midway and extends toward the top of the main body 2. The part of the air discharge hole 11a that opens to the side of the main body 2 is not an actual air flow path, so a plug 13 is attached.

[0025] The pressure relief hole 12 serves to release air to the outside. The pressure relief hole 12 is positioned so that it communicates with the flow path 5aa only when the front piston 5a moves forward. When the front piston 5a moves forward, the air discharge hole 11a and the pressure relief hole 12 communicate with each other via the flow path 5aa, reducing the pressure in the air discharge hole 11a.

[0026] To spray the water jet, the lever 3 is grasped and the receiving part 6 is pressed inward. The front piston 5a retracts into the internal space 8 and comes into contact with the rear piston 5b. As the front piston 5a retracts, the flow path 5aa opens into the internal space 8. Air in the internal space 8 is discharged through the flow path 5aa and the air discharge hole 11a. The air discharge hole outlet 11b communicates with the water jet spray switching air supply path B. The air discharged into the air discharge hole 11a flows into the water jet spray switching air supply path B, and the water jet is sprayed. Note that the timing of switching the water jet spray at this stage can also be determined using a safety spray switching device (not shown).

[0027] The air discharge holes 11a may be multiplexed. In Fig. 3 and other figures, the air discharge holes 11a are arranged only on one side of the main body 2, but they can be arranged on both sides. By providing multiple air discharge holes 11a, the air flow rate required to switch between water jet injection and non-injection increases.

[0028] As shown in the series of diagrams, switching between water jet injection and non-injection can be done using methods that utilize the intermittent flow of air, or an electrical method using a switch can be introduced. By using an electrical method, weight and size can be reduced. Components such as switches should be sealed, but permanent magnets can also be incorporated to prevent malfunctions.

[0029] A protrusion 5ba is formed on the tip of the rear piston 5b. This protrusion 5ba is intended to come into contact with the front piston 5a. When air is supplied from the air supply passage A into the internal space 8, the presence of the protrusion 5ba between the front piston 5a and the rear piston 5b causes air to enter around the protrusion 5ba, pushing the front piston 5a and the rear piston 5b outward from each other.

[0030] The safety guard 7 is a cover that prevents the lever 3 from being accidentally pressed. It is formed in a U-shape from the top to the bottom of the main body 2. The safety guard 7 also functions to protect the worker and the main body 2 from debris and dust scattered from the construction target W. To enhance this protective function, the safety guard 7 may be enlarged. If the safety guard 7 were box-shaped, the lever 3 and other components could be housed inside, protecting a wide area including the sides of the main body 2. The safety guard 7 contributes to improved safety in addition to the first safety mechanism S1 and the second safety mechanism S2. By dividing the piston 5 into a front piston 5a and a rear piston 5b, the water jet can be forcibly stopped from spraying, realizing multiple safety measures.

[0031] Furthermore, the two-stage safety measures of the first safety mechanism S1 and the second safety mechanism S2 have been described as being manually pressed in sequence, but in consideration of an even greater level of safety, it is also possible to add a function for adjusting the strength or time of pressing at least one of the safety mechanisms.

[0032] The strength of the pressure can be adjusted by appropriately changing the elastic force of the first safety mechanism S1, which uses a spring or the like, and by appropriately changing the strength of the air pressure applied to the pressure in the second safety mechanism S2, which uses air. Furthermore, the strength of the pressure of the first safety mechanism S1 and the second safety mechanism S2 can be adjusted manually or automatically.

[0033] In terms of time adjustment, the pressure applied to the first safety mechanism S1 and the second safety mechanism S2 is adjusted by manual pressure in principle, but by adding a timer function (not shown), it is possible to provide assistance with the pressure or set the mechanism to be pressed automatically.

[0034] (Water jet gun operating procedure) The operating procedure of the water jet gun 20 will be described. First, as a preparation for operation of the water jet gun 20, the switches of the air supply source and the water jet supply source (not shown) are turned on. When air is supplied from the air supply source through the air supply passage A and the air supply hole 10a into the internal space 8, the front piston 5a moves forward and the rear piston 5b moves backward (they push each other outward).

[0035] Next, depending on the work content at the work site, the worker sprays a water jet from the water jet gun 20 to clean, peel, chip, or the like, the work target W. Specifically, when the worker releases the contact between the backing plate 2a and the engaging portion 4 and then grips the lever 3, the receiving portion 6 presses the front piston 5a, and the air supply path A and the water jet spray switching supply path B communicate with each other. Thereafter, high-pressure water supplied from a water jet supply source (not shown) is sprayed from the spray nozzle of the water jet gun 20 to treat the work target W.

[0036] When processing of the workpiece W is complete or when the water jet spray is to be temporarily stopped, the lever 3 is released, causing the air in the internal space 8 to move the front piston 5a forward. This pushes out the receiving part 6, causing the lever 3 to move back. When the lever 3 moves back, the gap between the backing plate 2a and the engaging part 4 widens, and the reaction force of the elastic body 4a moves the engaging part 4, bringing it into contact with the backing plate 2a.

[0037] When the lever 3 is released, the air discharge hole 11a and the pressure relief hole 12 communicate via the flow path 5aa. As a result, the water jet spray switching air supply path B is depressurized, and the water jet spray stops. If the water jet spray does not stop even after the lever 3 is released, the end cap 5c of the rear piston 5b is pushed in, forcibly moving the front piston 5a forward and blocking the flow of air into the air discharge hole 11a.

[0038] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the gist of the present invention, and all technical matters included in the technical ideas described in the claims are subject to the present invention. The above-described embodiments are preferred examples, but a person skilled in the art can realize various alternatives, modifications, variations, or improvements from the contents disclosed in this specification, and these are included in the technical scope described in the appended claims. [Explanation of symbols]

[0039] 1 Water Jet Gun Grip 2 Main unit 2a Backing plate 2b Swivel support part 3 Lever 3a Bend part 4 Locking part 4a Elastic body 4b Pivot axis 5 pistons 5a Front piston 5aa flow path 5b Rear piston 5ba protrusion 5c End Cap 6 Receiving part 7 Safety Guard 8. Interior Space 9 Sealing part 10a Air supply hole 10b Air supply hole inlet 11a Air exhaust hole 11b Air exhaust hole outlet 12 Pressure relief hole 13 Plug 20 Water Jet Gun A Air supply path B Water jet injection switching air supply path S1 First safety mechanism S2 Second safety mechanism W Construction target

Claims

1. a first safety mechanism including a lever for switching between water jet ejection and non-ejection, a locking portion connected to the lever, and a backing plate that contacts the locking portion to restrict movement of the lever when the water jet is not ejected; a second safety mechanism including a receiving portion disposed on the lever and a piston that presses the receiving portion when the water jet is not being ejected; Includes grip for water jet gun.

2. The lever is a pivot shaft that supports the locking portion so that it can swing freely; an elastic body that biases the locking portion so as to protrude toward the backing plate, The grip for a water jet gun according to claim 1.

3. The piston is a front piston that contacts the receiving portion when the water jet is ejected; a rear piston disposed on the opposite side of the receiving portion with respect to the front piston; The front piston and the rear piston have protrusions on their opposing surfaces. The grip for a water jet gun according to claim 1 or 2.

4. an internal space into which the front piston and the rear piston fit; an air supply hole opening into the internal space; a main body having an air exhaust hole for discharging air that has flowed out from the internal space; a flow path that communicates the internal space with the air discharge hole when the front piston is pressed by the receiving portion, The grip for a water jet gun according to claim 3.

5. The rear piston has a portion opposite to the front piston protruding from the outside of the body, and the front piston can be pressed from the outside via the rear piston. The grip for a water jet gun according to claim 3 or 4.

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