JP2583171Y2 - Trigger type liquid ejector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trigger type liquid ejector.

[0002]

2. Description of the Related Art As shown in Japanese Utility Model Application Laid-Open No. 1-69658, a mounting cylinder to be fitted to the mouth and neck of a container body is provided at the lower end of an upright cylindrical section, a cylinder is provided from the middle of the upright cylindrical section, and an injection cylinder is provided from an upper end thereof. The front end face of a piston rod protruding forward from a piston fitted by being urged forward into the cylinder is engaged with the upper rear surface of a trigger that projects forward and pivots to the front of the injection cylinder and hangs down. At the same time, a ventilation path is formed by opening a lower end into the upper part of the mounting cylinder and an upper end in a cylinder wall portion where the piston outer surface faces the front end position and comes off the piston outer surface at the rear position. The road has breathability,
A trigger type liquid ejector interrupted by a water-impermeable sheet that is impermeable to water is known.

[0003]

The above-described conventional liquid ejector performs suction of outside air for replacement of the ejected liquid by a trigger operation through the ventilation path and the seat.
Press the front and rear ends of the piston against the inner wall of the cylinder,
Since the air passage and the outside air are provided so as to communicate only when the piston is retracted, the inside of the container to which the ejector is mounted may become high in pressure due to a temperature change or the like, and the discharge valve is once opened by a trigger operation from this state. In this case, the blockage was incomplete, so that liquid might leak from the nozzle hole.
The leakage stops as the pressure in the container decreases due to the leakage, and also ensures that the discharge valve is closed.However, the leaked liquid contaminates the vicinity of the nozzle, and such liquid leakage is repeated. Therefore, every time the liquid was dried, the liquid component was accumulated and the nozzle holes were sometimes clogged.

In the present invention, the above-mentioned drawbacks are eliminated by modifying the above-mentioned outside air intake passage to be a passage for both internal pressure discharge.

[0005]

Means for Solving the Problems A cylinder 14 is provided from an intermediate portion of an upright cylindrical portion 5 provided with a mounting cylindrical portion 3 fitted to an outer surface of a container body mouth and neck at a lower end, and an injection cylindrical portion 15 is provided from an upper end thereof. A piston rod 32 projecting forward and projecting forward from an elastic piston 31 fitted forward by being urged forward into the cylinder to the upper rear surface of a trigger 28 which is pivotally attached to the front part of the injection cylinder and hangs down. A front end face is engaged, and a lower end is inserted into an upper portion of the mounting cylinder portion, and an upper end is formed at a lower end of a cylinder wall portion where the outer surface of the piston overlaps at the front end position, and a ventilation path is formed with openings 21 and 20, respectively. In the trigger type liquid ejector in which the passage is blocked by a gas-permeable and water-impermeable water-resistant sheet 35, the front and rear ends of the piston 31 are formed to have a larger outer diameter and the middle part to have a smaller outer diameter than the cylinder inner diameter. And open both ends of the vent opening top 2 While pressing against both front and rear positions of 0, an appropriate number of ventilation grooves 34 are formed in the outer periphery of the front end of the piston, and a thin elastic skirt-like portion 33 expanding forward and outward from the front surface of the piston 31 is projected, The outer peripheral portion of the front end of the skirt portion was pressed against the inner wall surface of the cylinder to form a high-pressure air discharge valve.

[0006]

In the state shown in FIG. 1, the injection cylinder 6 is closed by the discharge valve 16 and the air passage 13 is closed by the water-resistant sheet 35, so that even if the container body falls down, liquid leakage does not occur. Absent. When the air in the container expands due to a temperature change or the like, the air in the container is discharged to the outside of the cylinder through the water-resistant sheet 14, the ventilation groove 34 on the outer periphery of the front end of the piston, and further through the high-pressure air discharge valve. . Therefore, the inside of the container does not become too high in pressure, and the trigger operation is performed when the inside of the container is in the high pressure state as in the case of the above-described conventional example, and the reason is that the inside of the container is still in the high pressure state after the operation. Liquid from the nozzle hole can be prevented.
The air passage becomes an outside air suction passage when the piston retreats.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference numeral 1 denotes a container body for standing the mouth and neck.

Reference numeral 2 denotes a trigger type liquid ejector, which is provided with a mounting cylindrical portion screwed to the outer surface of the mouth and neck at the lower end of the upright cylindrical portion.
The cylinder projects forward from the middle of the upright cylinder, and the injection cylinder projects forward from the upper end.

In the illustrated example, the mounting cylinder 3 is formed by projecting an engagement flange 4 inward from the upper end of the cylinder, and the upright cylinder 5 is a double cylinder having a large diameter at the lower part. The inner cylindrical portion 6 of the upright cylindrical portion has the lower portion of the cylindrical portion fitted into the mouth and neck of the container body, and the outward flange 8 provided in the middle of the cylindrical portion is connected to the upper end surface of the mouth and neck through packing. Further, the outer peripheral portion of the outward flange is engaged with the lower surface of the engaging flange 4, respectively, and the small-diameter inner cylindrical portion 10 is erected from the rear portion of the large-diameter cylindrical portion 7 of the upper closed surface which passes through the upper surface closing plate 9. Also, the outer cylinder part 11 has a lower large diameter part 12,
The inner cylindrical portion 6 is fitted to the outer surface of the large-diameter cylindrical portion 7 above the outward flange 8, and the lower end portion is engaged with the engaging flange 4 of the mounting cylindrical portion 3.
The small-diameter outer cylinder portion 13 fitted to the outer surface of the small-diameter inner cylinder portion 10 through the upper surface closing plate of the large-diameter portion 12 stands upright. And an injection cylinder 15 are additionally provided.

A suction valve 16 and a discharge valve 17 above the suction valve 16 are provided in the small-diameter inner cylinder portion 6, and a first communication hole 18 is formed in the cylinder 14 from a cylinder wall between the two valves. A second communication hole 19 communicating with the injection cylinder is formed in the upper cylinder wall. The rear lower cylinder wall portion of the cylinder 14 also serves as an upper surface closing plate of the large-diameter portion 12 of the outer cylinder portion, and the upper end opening 20 of the ventilation path is located in front of the cylinder wall portion, and is located below the cylinder wall portion. ,
The lower end opening 21 of the air passage is formed in the inner cylinder upper surface closing plate 9. In the illustrated example, the two openings are communicated by the groove 22 to form an air passage, but they may be directly communicated.

A nozzle cap 25 is rotatably fitted to the front end of the injection cylinder 15 so that the nozzle hole 26 can be opened and closed by the rotation. Further, a trigger 28 is vertically attached by pivotally connecting the upper ends formed in two branches to the left and right sides of the front part of the injection cylinder 15, and a forward bias is applied to the protrusion 14 protruding from the upper rear surface of the trigger into the cylinder 14 described above. The upper end of the piston rod 32 that projects forward from the elastic piston 31 fitted into the piston rod 31 is engaged.

The piston 31 is provided so that its outer surface overlaps with the cylinder wall portion having the upper end opening 20 of the above-described ventilation passage at the front end position shown in the figure. The front and rear ends of the piston are formed larger in diameter than the cylinder inner diameter, and the middle part of the piston is formed smaller in diameter than the cylinder inner diameter, and a suitable number of ventilation grooves 34 are formed in the outer periphery of the rear end of the piston. Further, a thin elastic skirt 33 protruding outward and outward from the front surface of the piston protrudes, and the outer peripheral portion of the front end of the skirt is pressed against the inner wall surface of the cylinder to form a high-pressure air discharge valve.

Although the above-mentioned air passage is blocked by a sheet 35 having air permeability, non-permeable and water-resistant, in the present invention, a sheet sticking cylinder 36 is provided as shown in FIG. The portion 6 was fitted into the large-diameter cylindrical portion 7. That is, the sheet sticking cylinder 36 has the first small cylinder 38 and the second small cylinder 39 standing up and down from the inside of the bottomed large cylinder 37, and has a large number of small through holes 40 in the lower bottom plate portion of the first small cylinder. In addition, a bottom plate portion below the second small cylinder is removed and opened, and a sheet 35 is attached to the upper surface of the first small cylinder, and the second small cylinder 39 is attached to the small-diameter inner cylinder portion 10 of the above-described inner cylinder portion. The large cylinder 37 was fitted into the lower outer surface and into the large-diameter cylinder part 7, respectively. The suction pipe 41 is hung from the lower part of the small-diameter cylindrical portion 10.

[0014]

[Effects of the Invention] The present invention has the above-described configuration, and has a cylinder.
(14) Both front and rear ends of the piston having elasticity greater than the inner diameter are made to have a large outer diameter, and the middle part is made to have a small outer diameter, and both ends are pressed against both front and rear positions of the upper end opening 20 of the ventilation passage, and at the outer periphery of the front end of the piston. Since a ventilation groove 34 is formed, and a thin elastic skirt-like portion 33 which expands forward and outward from the front surface of the piston protrudes and its outer peripheral portion at the front end is pressed against the inner wall surface of the cylinder, a high-pressure air discharge valve is formed. When the pressure in the body is increased, the gas is discharged to the outside of the cylinder through the ventilation path and the ventilation groove 34, and further through the high-pressure air discharge valve, so that the pressure inside the container is not increased. As described above, the trigger operation in the high-pressure state in the container causes the discharge valve to be incompletely closed, thereby preventing the liquid from leaking from the nozzle. Further, since the front and rear ends of the piston 31 have a large outer diameter and are pressed against the inner wall surface of the cylinder, the respective central axes of the piston and the cylinder coincide with each other. Since the central axis of the skirt 33 protruding from the front of the piston is the central axis of the piston, the skirt also does not tilt with respect to the cylinder 14 when reciprocating with the piston, and the valve function is uncertain. And never.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of the ejector of the present invention.

FIG. 2 is a perspective view of a piston with a piston rod.

FIG. 3 is an exploded perspective view of a sheet sticking cylinder.

[Explanation of symbols]

 20: Opening of the lower end of the ventilation path 21 ... Opening of the upper end of the ventilation path 33 ... Elastic skirt-shaped part 34 ... Vent groove 35 ... Air-permeable and water-resistant sheet

Claims (1)

(57) [Scope of request for utility model registration] 1. A cylinder 14 extending from an intermediate portion of an upright cylindrical portion 5 provided at a lower end thereof with a mounting cylindrical portion 3 fitted to the outer surface of the mouth and neck of a container body.
, And the trigger that projects the injection cylinder portion 15 forward from the upper end and pivotally attaches to the front portion of the injection cylinder portion and hangs down.
To the upper rear surface of 28, a front end face of a piston rod 32 projecting forward from a resilient piston 31 fitted by being urged forward into the cylinder is engaged, and a lower end into the upper portion of the mounting cylinder portion, and A trigger type liquid in which a ventilation path is formed at the lower end of the cylinder wall where the outer surface of the piston overlaps at the front end position with openings 21 and 20, respectively, and the path is blocked by a gas-permeable and water-impermeable water-resistant sheet 35. In the ejector, the front and rear ends of the piston 31 are formed with a larger outer diameter and the intermediate part is formed with a smaller outer diameter than the cylinder inner diameter, and these two ends are pressed against front and rear positions of the ventilation path upper end opening 20. At the same time, an appropriate number of ventilation grooves 34 are formed in the outer periphery of the piston front end, and the piston 31
A thin elastic skirt 33 that expands from the front of the front to the outside
A trigger-type liquid ejector characterized in that a high-pressure air discharge valve is formed by projecting the outer peripheral portion of the skirt and pressing the outer peripheral portion of the front end of the skirt portion against the inner wall surface of the cylinder.