JPH1099743A - Trigger type jetting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make elastic force of elastic bellows also serve as a restoration spring to eliminate a restoration coil spring or the like so as to facilitate the assemblage by using a bellows pump. SOLUTION: With regard to a bellows pump 6 operated by a trigger 8, an annular bellows fitting part 9 is installed behind the trigger 8, and elastic bellows 7 are formed for base end part opening and tip part closing, and also a fitting cylinder 11 is integrally provided for a base end part 10 successively. The fitting cylinder 11 is watertightly fitted and fixed in the bellows fitting part 9. A recessed surface 13 of a tip part 12 is butted to a pressurizing projection 14 provided in the upper part of the trigger 8. A suction valve 15 communicating with a suction flow passage 3 and a discharge valve 16 communicating with a discharge flow passage 5 are installed inside the enclosed bellows fitting part 9. A Fresh air introducing part 17 made adjacent to the bellows fitting part 9 and opened to inside a container body part is provided. A normally open air valve 18 is installed in a suitable place of the fresh air introducing path 17. A mechanical valve opening means 19 for forcibly opening the air valve with the pull operation is installed in a suitable place of the trigger 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trigger type ejector. Here, the trigger type ejector is
It refers to a trigger type sprayer, sprayer, foamer and the like.

[0002]

2. Description of the Related Art A trigger type ejector made of a synthetic resin provided with a plunger type pump operated by a trigger is already known (for example, Japanese Utility Model Application Laid-Open No. Sho 62-170168). This type of trigger type ejector mounts a trigger movably at an appropriate position of an ejector body having a plunger type pump, and mechanically connects the trigger with the plunger of the plunger type pump,
The pump is actuated by pulling the plunger in and out by pulling the trigger to obtain a jet of liquid.

[0003]

However, in this type of conventional trigger type ejector, a coil spring is provided inside a cylinder in the plunger type pump, and the plunger is urged in the ejection direction by the coil spring. Since the pushed plunger and trigger are restored, the actual volume of the cylinder is reduced by the coil spring. Therefore, the cylinder becomes large to secure a predetermined actual volume, and the efficiency is reduced. The flow of liquid in the cylinder is obstructed by the coil spring. Since the elasticity of the coil spring acts on the plunger that is airtightly and watertightly inserted into the cylinder in a direction against the insertion, the assembling is not easy. All in all, it is quite costly. And so on. The present invention takes these into account,
By replacing the plunger-type pump with a bellows-type pump and using the elasticity of the elastic bellows as the return spring, the return coil spring and the like are eliminated to facilitate assembly,
It is intended to solve each of the above problems.

[0004] In view of such a viewpoint, the invention of claim 1 has an ejector having a suction passage 3 having a suction pipe 2 suspended at an upstream end and a discharge passage 5 having a nozzle 4 attached at a downstream end. The main body 1 is equipped with a bellows-type pump 6 and a trigger 8 for compressing an elastic bellows 7 of the bellows-type pump 6.
An annular bellows fitting portion 9 is provided behind the trigger 8 so as to face the upper portion of the trigger 8, and the elastic bellows 7 is formed so as to be open at the base end and closed at the front end. The fitting tube 11 is integrally connected to the bellows fitting portion 9 in a watertight manner, and the end surface of the distal end portion 12 is formed in a concave surface 13. The suction valve 13 is brought into contact with the pressing projection 14 provided on the upper part of the trigger 8, and inside the enclosure of the bellows fitting portion 9, the suction valve 15 communicated with the suction channel 3, and the discharge flow A discharge valve 16 communicating with the passage 5, and an outside air introduction passage for opening the interior of the container body adjacent to the bellows fitting portion 9.
17 is provided, a normally closed air valve 18 is provided at an appropriate position of the outside air introduction passage 17, and a mechanical valve opening means 19 for forcibly opening the air valve 18 at an appropriate position of the trigger 8 with a pulling operation is provided. It is characterized by having.

According to a second aspect of the present invention, there is provided the above-described first aspect, wherein the outside air introduction passage 17 is provided with a short cylinder 20 surrounding the base end 10 of the elastic bellows 7 in the ejector main body 1. Provided,
The air valve 18 is formed by being opened from the inside of the short cylinder 20 to the inside of the container body. A skirt 21 is provided around the outer periphery of the base end 10 of the elastic bellows 7, and the skirt 21 is Tube
20 is formed by airtightly fitting the skirt 18 mechanically with the pulling operation of the mechanical valve opening means 19 into a proper position of the trigger 8 corresponding to a part of the skirt 18. It is formed by projecting a protruding piece 22 to be opened.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of a trigger type ejector according to the first and second aspects of the present invention. In the figure, reference numeral 1 denotes an ejector body having a suction flow path 3 having a suction pipe 2 suspended at an upstream end and a discharge flow path 5 having a nozzle 4 attached at a downstream end, and 6 denotes an ejector body. The bellows-type pump 8 is provided with a trigger provided on the ejector body 1 so as to compress the elastic bellows 7 of the bellows-type pump, and the trigger 17 is opened into the container body adjacent to the bellows-type pump 6. Fresh air introduction channel, 18
Is a normally closed air valve provided at an appropriate position in the outside air introduction path, 19 is
Mechanical valve opening means provided at an appropriate position of the trigger 8 to forcibly open the air valve 18 in accordance with a pulling operation, and is entirely made of a synthetic resin molded member.

[0007] The ejector body 1 is in the form of an inverted L-shaped pistol projecting forward, and a suction passage 3 standing upright on the base side.
And a discharge channel 5 directed forward on the front side,
A mounting cylinder that is screwed into the mouth and neck of the container body at the lower end of its base
The suction pipe 2 is fitted and suspended from the suction channel 3 by being loosely inserted into the mounting cylinder 23, and the nozzle 4 is mounted at the front end thereof so as to communicate with the discharge channel 5. The trigger 8 is pivotally mounted at the front part, and is vertically suspended to be swingable in the front-rear direction. The nozzle 4 is optional, such as a nozzle for spraying, a nozzle for jetting, a nozzle for foaming, or a nozzle capable of switching among them, depending on the application.

The bellows type pump 6 has an annular bellows fitting portion 9 facing the trigger 8 at a portion corresponding to the L-shaped inner corner of the ejector body 1 and behind the trigger 8.
Is provided inside the bellows fitting portion 9 so that the suction passage 3
And a discharge valve 16 connected to the discharge flow path 5. The bellows fitting portion 9 has a concentric double cylinder of an inner cylinder 24 and an outer cylinder 25 provided at an appropriate position of the ejector main body 1 and is formed between the two cylinders. The elastic bellows 7 is provided with a fitting tube 11 integrally connected to the base end portion 10 so that the fitting tube 11 is fitted and fixed to the bellows fitting portion 9 in a watertight manner.
A short auxiliary fitting tube 26 is integrally provided from the base end portion 10 inside the inner tube 24, and the auxiliary fitting tube 26 is fitted inside the inner tube 24. Further, the end surface of the tip portion 12 is formed as a concave surface 13 so that the concave surface
13 abuts against a pressing projection 14 provided on the upper back surface of the trigger 8.

The suction valve 15 has a small-diameter valve cylinder 27 projecting concentrically with the inner cylinder 24 and the outer cylinder 25, and the distal end of the valve cylinder 27 is connected to a valve seat 28.
Further, a valve hole 29 is formed in the valve cylinder, and the valve portion 31 of the valve body 30 is seated on the valve seat 28. This valve body 30 is a discharge valve
The sixteen valve elements 32 are integrally formed with a flexible synthetic resin, and are connected to the base cylinder 33 of the discharge valve 16 with an appropriate number of connecting pieces. Discharge valve 16
A skirt 34 projecting outward from the tip of the base cylinder 33 obliquely rearward from the tip of the base cylinder 33, the base cylinder 33 is fitted to the outer periphery of the base of the valve cylinder 27, and the inside of the base of the inner cylinder 24 is The periphery is defined as a valve seat 35, and the inside of the inner cylinder 24 is defined as a valve hole 36, and the skirt 34 is brought into contact with the valve seat 35. Therefore, by fitting the base cylinder 33 to the valve cylinder 27, not only the discharge valve 16 but also the suction valve 15 can be assembled at once. The valve hole 29 of the suction valve 15 and the valve hole 36 of the discharge valve 16 communicate with the suction channel 3 and the discharge channel 5 through through holes 37 and 38, respectively.

The outside air introduction passage 17 is provided with a short cylinder 20 surrounding the base end 10 of the elastic bellows 7 integrally projecting from the distal end of the outer cylinder 25 in the ejector main body 1. The air valve 18 is formed by opening the inside of the body, that is, into the mounting cylinder 23.
Is provided on the outer periphery of the base end portion 10 of the elastic bellows 7 with an outwardly directed skirt 21 extending obliquely rearward.
It is formed by fitting airtightly to 20 and mechanical valve opening means 19
Is formed by projecting a protruding piece 22 that mechanically forcibly pushes and opens the skirt 21 in accordance with a pulling operation at an appropriate position on the back surface of the trigger 8 corresponding to a part of the skirt 21, that is, the lower part.

The trigger 8 has a pair of right and left standing projections at the upper end.
39, a pair of cantilever shafts 40 projecting from both upstanding projections 39,
It is pivotally mounted on both sides of the front part of the ejector main body 1 by a cantilever shaft 40, and is mounted to be swingable in the front-rear direction. Further, the above-described pressing projection 14 is provided at an upper portion of the back surface, and the above-described projection 22 is provided below the pressing projection 14.

In use, the container is mounted on the mouth and neck of the container housing the liquid by the mounting cylinder 23,
By releasing the trigger 8, the elastic bellows 7 is compressed and expanded by the pressing projection 14, and the bellows type pump 6 is operated. The liquid in the container is sucked up through the suction pipe 2 and pressurized, and the nozzle 4 is pressurized. (Spray, injection, foaming, etc.). In this operation, the elastic bellows 7 compressed by pulling the trigger 8 expands by its own elasticity, and the trigger 8 is returned. When the trigger 8 is pulled, the protruding piece 22 as the mechanical valve opening means 19 in the trigger 8 is connected to the air valve.
The skirt 21 of 18 is pushed open to mechanically open the air valve 18, and outside air flows into the container through the outside air introduction path 17, thereby preventing negative pressure due to a decrease in liquid in the container.

[0013]

According to the first and second aspects of the present invention, the following effects can be obtained by the above-described configuration. The elastic bellows 7 can also serve as a return spring,
No return coil spring or the like is required inside the pump. Since a coil spring or the like is not required in the pump, the substantial volume of the pump is not reduced by the coil spring or the like, and the substantial volume of the pump can be increased and efficiency can be improved. Since no coil spring or the like is required in the pump, the flow of the liquid in the pump is not hindered by the coil spring or the like, and a smooth flow can be obtained. The elastic bellows 7 eliminates the need for plungers and pistons. No need for a coil spring for return inside the pump,
In addition, since neither a plunger nor a piston is required, and the elastic bellows 7 only needs to be fitted, assembly of the pump is facilitated and assembly labor can be reduced. Even with the bellows type pump 6, the external air introduction path 17 for opening the inside of the container body and the normally closed air valve 18 of the external air introduction path 17 are forcibly opened by the mechanical valve opening means 19 with the pulling operation of the trigger 8. The pressure in the container does not tend to be negative as in the case of using a check valve, and the efficiency of the pump can be improved. Overall, costs can be reduced.

In addition, according to the second aspect of the present invention, the skirt 21 of the air valve 18 can be integrally provided with the elastic bellows 7 by the above-described configuration, and the air valve 18 is also assembled by assembling the elastic bellows 7. Can be assembled at once, air valve 18
It does not take time to assemble. Moreover, its air valve 18
The forcible valve opening can be surely performed by mechanically pushing and opening the skirt 21 by the projecting piece 22 as the mechanical valve opening means 19, and the outside air can be accurately introduced into the container through the outside air introduction path 17.

[Brief description of the drawings]

FIG. 1 is a cutaway side view showing an embodiment of a trigger type ejector according to the first and second aspects of the present invention.

[Explanation of Signs] 1 ... Ejector body 2 ... Suction pipe 3 ... Suction channel 4 ... Nozzle 5 ... Discharge channel 6 ... Bellows pump 7 ... Elastic bellows 8 ... Trigger 9 ... Bellows fitting part 10 ... Base end Part 11: Fitting tube 12 ... Tip 13 ... Concave surface 14 ... Pressing projection 15 ... Suction valve 16 ... Discharge valve 17 ... Outside air introduction path 18 ... Air valve 19 ... Mechanical valve opening means 20 ... Short tube 21 ... Skirt 22 ... projecting piece 23 ... mounting cylinder 24 ... inner cylinder 25 ... outer cylinder 26 ... auxiliary fitting cylinder 27 ... valve cylinder 28 ... valve seat 29 ... valve hole 30 ... valve element 31 ... valve part 32 ... valve element 33 ... base cylinder 34 ... skirt 35 ... valve seat 36 ... valve hole 37 ... through hole 38 ... through hole 39 ... standing protrusion 40 ... cantilever shaft

Claims (2)

[Claims] 1. An ejector body 1 having a suction flow path 3 having a suction pipe 2 suspended at an upstream end and a discharge flow path 5 having a nozzle 4 attached at a downstream end, a bellows type pump 6,
A trigger 8 for compressing the elastic bellows 7 of the bellows-type pump 6 is provided, and the ejector body 1 is provided with an annular ring for the bellows-type pump 6 behind the trigger 8 and facing the upper part of the trigger 8. Bellows fitting part 9
The elastic bellows 7 is formed to be open at the base end and closed at the front end, and a fitting tube 11 is integrally connected to the base end 10 so that the fitting tube 11 is connected to the bellows fitting portion. 9, and a pressing projection provided with a concave surface 13 on the end surface of the distal end portion 12, and the concave surface 13 provided on the upper portion of the trigger 8.
14, a suction valve 15 connected to the suction passage 3 and a discharge valve 16 connected to the discharge passage 5 are provided inside the bellows fitting portion 9. And
An outside air introduction passage 17 is provided adjacent to the bellows fitting portion 9 and opened to the inside of the container body. A normally closed air valve 18 is provided at an appropriate position of the outside air introduction passage 17, and the trigger 8 is pulled to an appropriate position. A trigger type ejector characterized in that a mechanical valve opening means 19 for forcibly opening an air valve 18 in accordance with an operation is provided. 2. The outside air introduction path 17 is connected to the
Is formed by providing a short tube 20 surrounding the base end 10 of the elastic bellows 7 and opening the inside of the short tube 20 to the inside of the container body. edge
A skirt 21 is provided around the outer periphery of 10, and the skirt 21 is formed by airtightly fitting the short tube 20. The mechanical valve-opening means 19 corresponds to a part of the skirt 21. 2. A trigger type ejector according to claim 1, wherein said trigger is formed by projecting a protruding piece for mechanically forcibly pushing open said skirt in accordance with a pulling operation.