JP7645746B2 - Trigger-type liquid ejector - Google Patents

Description

The present invention relates to a trigger-type liquid ejector.

Trigger-type liquid ejectors are known that suck up liquid from a container by operating a trigger portion and eject the liquid through an ejection hole.
One known example of this type of trigger-type liquid ejector is shown in Patent Document 1 below, which has a ejector body that is attached to a container body that contains liquid, and a nozzle portion that has an ejection hole that ejects liquid forward.

The ejector body includes a vertical supply tube portion that sucks up the liquid in the container body, an ejection tube portion that extends forward from the vertical supply tube portion, and a trigger mechanism having a trigger portion that is arranged so as to be movable rearward in a forward biased state. By moving the trigger portion rearward, the trigger mechanism introduces the liquid from the vertical supply tube portion into the ejection tube portion and ejects it from the ejection tube portion toward the ejection hole side.
The nozzle portion is combined with the front end portion of the injection tube portion via a relay member. Furthermore, a pressure accumulator valve that opens and closes the ejection hole is provided in the nozzle portion. When the pressure in the pressure accumulator chamber reaches or exceeds a predetermined pressure, the pressure accumulator valve opens the ejection hole, causing the contents to be ejected from the ejection hole.

JP 2011-177630 A

However, in the trigger-type liquid ejector described in Patent Document 1, a pressure accumulator valve is provided in the nozzle section, which makes the structure of the nozzle section complicated and increases the size of the nozzle section. This ultimately leads to an increase in the size of the entire trigger-type liquid ejector.

The present invention was made in consideration of these circumstances, and its purpose is to provide a trigger-type liquid ejector that can reduce the size of the entire trigger-type liquid ejector while miniaturizing the nozzle portion and simplifying the configuration, and that can eject pressurized liquid contents.

(1) The trigger-type liquid ejector of the present invention comprises an ejector body that is attached to a container body containing liquid, and a nozzle portion that is attached to the ejector body and has an ejection hole for ejecting liquid. The ejector body has a supply tube portion that sucks up the liquid in the container body, an ejection tube portion that extends from the supply tube portion and has an ejection opening that opens to the outside of the ejector body, and a trigger portion that is arranged so as to be movable backward in a forward-biased state by an elastic arm portion, and the rearward movement of the trigger portion ejects liquid from within the supply tube portion through the ejection tube portion. The device is equipped with a trigger mechanism that causes the pressure to flow toward the ejection hole side by pressing the trigger against the pressure accumulator valve, a pressure accumulator valve that is movably arranged within the injection tube and that releasably closes the injection opening, and an elastic body that contacts the pressure accumulator valve from the rear, and the elastic body elastically deforms due to an increase in pressure within the injection tube, thereby allowing the pressure accumulator valve to move rearward to open the injection opening, and urging the pressure accumulator valve forward by elastic restoration deformation as the pressure within the injection tube decreases, and the elastic body and the elastic arm portion are formed as a single unit.

According to the trigger-type liquid ejector of the present invention, the liquid can be circulated from the supply tube through the injection tube toward the ejection hole by operating the trigger to move it backward against the force of the elastic arm. At this time, since the ejection opening is blocked by the pressure accumulator valve, the liquid supplied to the ejection tube increases the pressure in the ejection tube. When the pressure in the ejection tube increases, the pressure accumulator valve moves backward against the force of the elastic body due to this increase in pressure. This causes the pressure accumulator valve to move away from the ejection opening and open the ejection opening. Therefore, the liquid with increased pressure can be guided through the ejection opening to the ejection hole of the nozzle, and can be ejected from the ejection hole to the outside. Furthermore, since the pressure accumulator valve is provided, the pressure of the liquid ejected from the ejection hole can be stabilized, so the liquid can be ejected in the desired manner.

In particular, since the accumulator valve is provided inside the ejection tube, the nozzle section can be made smaller than in the conventional case where the accumulator valve is provided inside the nozzle section, and the structure can be simplified, so that, for example, bulkiness of the nozzle section in the front-back direction and up-down direction can be easily suppressed. Therefore, the entire trigger-type liquid ejector can be made smaller.
Furthermore, since the pressure accumulator valve is provided in the injection tube, the internal volume of the injection tube can be reduced without increasing the number of parts. This allows the pressure in the injection tube to be increased quickly when the trigger is operated, making it possible to reduce the number of priming operations. Furthermore, by reducing the internal volume of the injection tube, air is less likely to remain in the injection tube, making it possible to suppress variations in the amount of injection and dripping from the injection hole caused by remaining air.
Furthermore, since the elastic body and the elastic arm are integrally formed, there is no need to provide a separate biasing member for biasing the trigger forward, which not only reduces the number of parts but also leads to lower costs.

(2) The ejector body may include a blocking member having a blocking wall that blocks the ejection tube portion from the rear, the elastic body may be disposed inside the ejection tube portion and integrally formed with the blocking wall, and the elastic arm portion may be disposed outside the ejection tube portion and integrally formed with the blocking wall.

In this case, the elastic body and the elastic arm portion can be formed integrally via the blocking wall, and can be handled as a single unit as a blocking member. This allows for a reduction in the number of parts while improving ease of assembly.

(3) The pressure accumulator valve may be disposed within the ejection tube section over the entire length of the ejection tube section.

In this case, since the pressure accumulator valve is disposed over the entire length of the injection tube, the internal volume of the injection tube can be further reduced. This makes it possible to more effectively reduce the number of priming operations and also suppress the remaining air in the injection tube.

(4) The blocking member may include a first engaging portion that engages with the upper portion of the ejection tube portion from the front, and a second engaging portion that engages with side portions of the ejector body that are located on both radial sides of the ejection tube portion, sandwiching the ejection tube portion, from the front when viewed from above the ejector body.

In this case, the blocking member is prevented from coming off rearward from the injection tube portion by the first and second locking portions being locked at multiple points. Therefore, the elastic arm portion can be used to more stably bias the trigger portion forward, and the blocking member can be easily stabilized without rattling when the trigger portion is operated rearward. Furthermore, because the blocking member can be more stably combined with the injection tube portion, a stronger seal can be ensured between the injection tube portion and the blocking member, improving product reliability.

The trigger-type liquid ejector of the present invention allows the nozzle portion to be made smaller and the configuration simplified while also allowing the entire trigger-type liquid ejector to be made smaller, and further allows the liquid contents to be ejected under pressure.

1 is a vertical cross-sectional view showing an embodiment of a trigger type liquid ejector according to the present invention. FIG. 2 is a perspective view of the trigger type liquid ejector shown in FIG. 1 . FIG. 2 is a perspective view of the blocking member shown in FIG. 1 . 2 is a vertical cross-sectional view showing a state in which the pressure accumulator valve has moved rearward from the state shown in FIG. 1 and the injection opening has been opened. FIG.

Below, an embodiment of a trigger-type liquid ejector according to the present invention will be described with reference to the drawings. In this embodiment, an ejection container in which a trigger-type liquid ejector is attached to a container body will be described as an example.

As shown in Figures 1 and 2, the trigger-type liquid ejector 1 of this embodiment comprises a ejector body 2 that is attached to a container body A that contains liquid, a nozzle portion 3 that is attached to the ejector body 2 and has an ejection hole 4 for ejecting the liquid, and a cover body 5 that covers the ejector body 2 and the nozzle portion 3.
2, the cover body 5 is omitted. Furthermore, unless otherwise specified, each component part of the trigger type liquid ejector 1 is a molded product made of synthetic resin.

(Ejector body)
The ejector body 2 mainly comprises a vertical supply tube portion (the supply tube portion according to the present invention) 10, an injection tube portion 20, an attachment cap 30, a pressure accumulator valve 40, a blocking member 50, a trigger mechanism 60, and a ball valve 70.

In this embodiment, the central axis of the vertical supply tube portion 10 is the axis O1, the container body A side along this axis O1 is called the lower side, the opposite side is called the upper side, and the direction along the axis O1 is called the up-down direction. Furthermore, in a plan view seen from the up-down direction, one direction intersecting the axis O1 is called the front-rear direction L1, and the direction perpendicular to both the up-down direction and the front-rear direction L1 is called the left-right direction L2.
Furthermore, in this embodiment, the central axis of the injection tube portion 20 is defined as axis O2. In this embodiment, axis O2 extends in the front-rear direction L1. Therefore, in this embodiment, front-rear direction L1 corresponds to the axial direction along the central axis of the injection tube portion 20. However, the axial direction along axis O2 does not have to coincide with the front-rear direction L1.

(Vertical supply tube part)
1 , the vertical supply tube portion 10 extends in the vertical direction and has a function of sucking up liquid in the container body A. The vertical supply tube portion 10 mainly includes an outer tube 11 and an inner tube 12 fitted into the outer tube 11.

The outer tube 11 comprises a large diameter portion 11b having a flange portion 11a that is placed on the upper opening edge of the mouth of the container body A via a gasket, a small diameter portion 11c that is placed above the large diameter portion 11b and has a smaller diameter than the large diameter portion 11b, a connecting tube portion 11d that is disposed above the small diameter portion 11c and has a smaller diameter than the small diameter portion 11c, and a top wall portion 11e that connects the upper end of the small diameter portion 11c to the lower end of the connecting tube portion 11d.
The small diameter portion 11c is disposed coaxially with the axis O1, and the connecting cylindrical portion 11d is disposed at a position eccentric to the front with respect to the axis O1. The top wall portion 11e covers the ball valve 70 from above.

The inner cylinder 12 is formed to extend in the vertical direction and is fitted inside the small diameter portion 11c while being arranged coaxially with the axis O1. In this way, the inner cylinder 12 is combined integrally with the outer cylinder 11. The upper part of the pipe 13, which extends in the vertical direction and draws up liquid from the container body A, is fitted inside the inner cylinder 12.

The vertical supply tube portion 10 configured as described above is attached (screwed) to the mouth of the container body A by the attachment cap 30 that presses the flange portion 11a of the outer tube 11 from above.

(Injection tube part)
An injection tube portion 20 is disposed above the vertical supply tube portion 10 .
The injection tube portion 20 is connected to the upper end of the connecting tube portion 11d of the vertical supply tube portion 10, and is formed so as to extend forward around the axis O2. The injection tube portion 20 is formed in a cylindrical shape having a front wall and an open rear end. A communication hole is formed in the front wall of the injection tube portion 20, penetrating the front wall in the front-rear direction L1. The inside of this communication hole is an injection opening portion 21 that opens forward.

A rear cylinder portion 22 is disposed coaxially with the axis O2 at the rear end of the injection cylinder portion 20. The rear cylinder portion 22 is a part that constitutes the injection cylinder portion 20.
The rear tube portion 22 is formed in a cylindrical shape with an inner diameter and an outer diameter larger than those of the injection tube portion 20, and opens to the rear. The rear tube portion 22 is integrally formed with the upper end of the connection tube portion 11d of the vertical supply tube portion 10, and is formed to extend rearward beyond the connection tube portion 11d. A through hole 23 that passes through the rear tube portion 22 in the vertical direction is formed in the lower part of the rear tube portion 22. As a result, the inside of the rear tube portion 22 and the inside of the connection tube portion 11d are in communication with each other through the through hole 23. Therefore, the inside of the injection tube portion 20 is in communication with the inside of the connection tube portion 11d through the through hole 23.

A fitting space 24 that is open both rearward and in the left-right direction L2 is formed between the lower portion of the rear tube section 22 and the top wall section 11e of the outer tube 11 in the vertical supply tube section 10.

Furthermore, a middle cylinder portion 25 extending rearward is formed at the rear end of the injection cylinder portion 20. The middle cylinder portion 25 is disposed coaxially with the axis O2 and is disposed inside the rear cylinder portion 22. The middle cylinder portion 25 is formed in a cylindrical shape with an inner diameter equal to the inner diameter of the injection cylinder portion 20 and an outer diameter smaller than the inner diameter of the rear cylinder portion 22. As a result, an annular space centered on the axis O2 is formed between the middle cylinder portion 25 and the rear cylinder portion 22.
The lower portion of the middle cylinder portion 25 is disposed so as to cover the above-mentioned through hole 23 from above.

A blocking member 50 that blocks the rear cylinder portion 22 from the rear is attached to the injection cylinder portion 20 configured as described above. As a result, the entire injection cylinder portion 20 is internally blocked by the blocking member 50.
The blocking member 50 will be described in detail later.

(Accumulator valve)
An accumulator valve 40 is disposed within the injection tube portion 20 described above.
The pressure accumulator valve 40 is disposed within the injection tube portion 20 so as to be movable in the front-rear direction L1, and includes a pressure accumulator valve body 41 that openably closes the injection opening 21 from the rear.

The accumulator valve body 41 is formed in a cylindrical shape extending along the front-rear direction L1 and is arranged coaxially with the axis O2. The accumulator valve body 41 is inserted into the injection tube section 20 from the rear and arranged over the entire length of the injection tube section 20. In this case, the accumulator valve body 41 extends along the front-rear direction L1 so that, when the front end portion is in contact with the injection opening 21 from the rear, the rear end portion is located rearward of the rear tube section 22.

The front end of the accumulator valve body 41 is formed with a hemispherical seal 42 that protrudes forward and contacts the injection opening 21 from the rear. The rear end of the accumulator valve body 41 is formed with an annular flange 43 that extends radially outward from the injection tube 20, and a rear projection 44 that protrudes further rearward.

A sliding cylinder portion 45 is formed on the flange portion 43 and protrudes forward from the front surface of the flange portion 43. The sliding cylinder portion 45 is disposed between the rear cylinder portion 22 and the middle cylinder portion 25, and gradually extends radially outward of the injection cylinder portion 20 as it moves forward. The sliding cylinder portion 45 is formed to be elastically deformable, and the front end portion of the sliding cylinder portion 45 is in close contact with the inner peripheral surface of the rear cylinder portion 22 due to an elastic restoring force.
This enables the sliding cylindrical portion 45 to slide on the inner surface of the rear cylindrical portion 22 while maintaining a constant level of sealing between the sliding cylindrical portion 45 and the rear cylindrical portion 22 when the pressure accumulator valve 40 moves in the fore-and-aft direction L1.

The rear protrusion 44 is formed with a tapered cross section that gradually reduces in diameter toward the rear. As a result, the outer peripheral surface of the rear protrusion 44 is a tapered surface 44a that extends toward the inside in the radial direction of the injection tube portion 20 as it extends toward the rear.

The accumulator valve main body 41 is formed in a cylindrical shape with an outer diameter smaller than the inner diameter of the injection tube portion 20. As a result, a gap S1 extending in the front-rear direction L1 is formed between the outer peripheral surface of the accumulator valve main body 41 and the inner peripheral surface of the injection tube portion 20. The space including this gap S1 and surrounded by the flange portion 43, the sliding tube portion 45, and the rear tube portion 22 functions as the accumulator chamber S2.
The pressure accumulation chamber S2 communicates with the inside of the connecting tube portion 11d of the vertical supply tube portion 10 through a through hole 23.

The cylinder tube portion 15 protruding forward is formed integrally with the outer tube 11 in a portion located below the injection tube portion 20 configured as described above and above the mounting cap 30. The cylinder tube portion 15 opens forward.

(Relay member)
Furthermore, relay member 80 that connects injection tube portion 20 and nozzle portion 3 is attached to injection tube portion 20 configured as described above.
1 and 2 , relay member 80 is attached from the front to injection tube portion 20. Relay member 80 is located forward of injection opening 21 of injection tube portion 20 and includes an opposing wall portion 81 disposed opposite injection opening 21, a first relay tube portion 82 extending rearward from opposing wall portion 81 and fitted onto the injection tube portion 20, a second relay tube portion 83 extending forward from opposing wall portion 81, and a guide shaft 84 located inside second relay tube portion 83 and extending forward from opposing wall portion 81.

The second relay tube portion 83 and the guide shaft 84 are disposed about an axis O3 that is eccentric downward with respect to the axis O2 of the injection tube portion 20. A communication hole 85 that communicates with the injection opening 21 of the injection tube portion 20 is formed in a portion of the opposing wall portion 81 that is located above the guide shaft 84 and inside the second relay tube portion 83. As a result, the interior of the second relay tube portion 83 communicates with the interior of the injection tube portion 20 through the communication hole 85 and the injection opening 21.
A first switching groove 86 extending in the front-rear direction L1 is formed on the outer circumferential surface of the guide shaft 84. The first switching grooves 86 are formed at intervals around the axis O3.

Furthermore, as shown in FIG. 1, a pair of lever support walls 87 extending rearward are formed on both sides of the opposing wall portion 81 in the left-right direction L2, sandwiching the second relay tube portion 83 therebetween. The lever support walls 87 are disposed with a gap between them and the second relay tube portion 83.

(Trigger mechanism)
1 and 2, the trigger mechanism 60 includes a trigger portion 61, a main cylinder 62, and a main piston 63. The trigger mechanism 60 is capable of circulating the liquid from inside the vertical supply tube portion 10 through the injection tube portion 20 toward the ejection hole 4 side by the rearward swinging of the trigger portion 61.

The main cylinder 62 is fitted into the cylinder tube portion 15. The main cylinder 62 is formed into a bottomed tube shape that opens forward. The inside of the main cylinder 62 is connected to a portion of the outer tube 11 of the vertical supply tube portion 10 that is located above the inner tube 12.

The main piston 63 is disposed in the main cylinder 62 so as to be movable in the front-rear direction L1. The main piston 63 is movable in the front-rear direction L1 in conjunction with the swinging of the trigger portion 61. As a result, the inside of the main cylinder 62 is pressurized and depressurized as the main piston 63 moves in the front-rear direction L1. The main piston 63 is formed in a topped cylindrical shape that is open to the rear and closed at the front.
The main piston 63 is biased forward together with the trigger portion 61 by a biasing force of an elastic arm portion 52 of the blocking member 50 (described later). The main piston 63 moves rearward as the trigger portion 61 swings rearward, and is pushed into the main cylinder 62.
When the trigger portion 61 is in the forwardmost swing position, the main piston 63 is correspondingly located in the forwardmost position.

The trigger portion 61 includes a trigger body 65, a support piece 66, and a receiving portion 67, and is disposed in front of the main piston 63 so as to be movable back and forth.
The trigger body 65 extends in a forward inclined manner from above to below in front of the main piston 63. The trigger body 65 is a part that is gripped when performing a spraying operation, and is hooked from the front by, for example, an index finger.
A front end of the main piston 63 is connected to a vertical middle portion of the trigger body 65. This allows the main piston 63 to move back and forth in association with the back and forth movement of the trigger portion 61.

A pair of support pieces 66 are provided at the upper end of the trigger body 65 with a gap therebetween in the left-right direction L2. The pair of support pieces 66 are respectively combined with a pair of lever support walls 87 formed on the relay member 80 so as to be rotatable about an axis O4 along the left-right direction L2. This allows the trigger portion 61 to be rotated about the axis O4 with the pair of support pieces 66 as fulcrums.

A pair of receivers 67 are provided on the left and right sides of the trigger body 65. The receivers 67 protrude from the trigger body 65 on both sides in the left-right direction L2 and are formed to open upward and backward. The elastic arm portion 52 of the blocking member 50, which will be described later, is fitted into the receivers 67. As a result, the trigger portion 61 is urged forward by the elastic restoring force of the elastic arm portion 52.

(Ball valve)
As shown in FIG. 1 , the ball valve 70 is provided inside the inner cylinder 12 of the vertical supply cylinder portion 10 .
The ball valve 70 is disposed inside the upper end of the inner cylinder 12 and is seated removably on an annular tapered cylinder 71 protruding inward from the inner peripheral surface of the inner cylinder 12. The ball valve 70 is a check valve that blocks communication between the inside of the container body A and the inside of the main cylinder 62 through the inside of the vertical supply cylinder portion 10 when the inside of the main cylinder 62 is pressurized, and moves upward and separates from the tapered cylinder 71 when the inside of the main cylinder 62 is depressurized, thereby allowing communication between the inside of the container body A and the inside of the main cylinder 62 through the inside of the vertical supply cylinder portion 10. The ball valve 70 is restricted in its upward movement by the top wall portion 11e of the outer cylinder 11.

(Closure member)
1 and 2, in the ejector main body 2 configured as described above, a blocking member 50 is combined from the rear with the rear cylinder portion 22 of the injection cylinder portion 20. As a result, the blocking member 50 blocks the injection cylinder portion 20 from the rear with the accumulator valve 40 enclosed inside the injection cylinder portion 20.
The blocking member 50 includes at least an elastic protrusion (elastic body) 51 that contacts the accumulator valve 40 from behind and positions the accumulator valve 40 in a state in which the accumulator valve main body 41 blocks the injection opening 21, and a pair of elastic arm portions 52 that urge the trigger portion 61 forward.

The blocking member 50 will now be described in detail.
As shown in Figures 1 to 3, the blocking member 50 comprises a blocking wall 53 that contacts the rear opening end of the rear tube portion 22 in the injection tube portion 20 from the rear, and a fitting tube 54 that extends forward from the blocking wall 53 and is fitted into the inside of the rear tube portion 22.

The elastic protrusions 51 are formed to extend forward from a portion of the blocking wall 53 located inside the fitting tube 54, and are arranged in a circumferentially spaced arrangement around the axis O2. The pair of elastic arm portions 52 are formed to extend forward from portions of the blocking wall 53 located on both sides of the fitting tube 54 in the left-right direction L2.

The blocking wall 53 contacts from the rear over the entire circumference of the rear opening end of the rear tube portion 22. A first locking projection (first locking portion) 55 is formed on the outer circumferential surface of the fitting tube 54. The first locking projection (first locking portion) 55 protrudes radially outward from the injection tube portion 20 and fits into the locking hole 22a formed in the rear tube portion 22 to be locked to the locking hole 22a from the front.
The first locking projection 55 is formed at least on the upper portion of the fitting tube 54. In the illustrated example, a plurality of the first locking projections 55 are formed on the outer circumferential surface of the fitting tube 54 at intervals in the circumferential direction, and one of them is formed on the upper portion of the fitting tube 54.
As a result, the fitting tube 54 is fitted into the inside of the rear tube portion 22 while being prevented from slipping out rearward by the first locking projections 55 .

The elastic protrusion 51 contacts from the rear with the tapered surface 44a of the rear protrusion portion 44 formed on the injection tube portion 20. As a result, the elastic protrusion 51 positions the accumulator valve 40 in a state in which the accumulator valve main body 41 closes the injection opening 21. The elastic protrusion 51 elastically deforms due to the pressure inside the injection tube portion 20, i.e., the pressure increase inside the accumulator chamber S2, thereby allowing the accumulator valve 40 to move rearward to open the injection opening 21, and also urges the accumulator valve 40 forward by elastic restoration deformation as the pressure inside the accumulator chamber S2 decreases.
In this embodiment, the elastic protrusion 51 positions the accumulator valve 40 so as to block the flow of liquid through the injection opening 21 until the pressure in the accumulator chamber S2 reaches a predetermined value, and when the pressure in the accumulator chamber S2 exceeds the predetermined value (including the predetermined value, i.e., when it becomes equal to or greater than the predetermined value), it elastically deforms to open the injection opening 21.
In this way, when the pressure in the pressure accumulation chamber S2 exceeds a predetermined value, it is preferable that the elastic protrusion 51 elastically deforms and ejects the pressurized liquid from the ejection tube portion 20 through the ejection opening 21.

Specifically, when the pressure in the accumulator chamber S2 exceeds a predetermined value, the elastic protrusion 51 elastically deforms so as to bend radially outward in the injection tube portion 20 while moving along the tapered surface 44a of the rear protrusion portion 44 (see FIG. 4). As a result, the elastic deformation of the elastic protrusion 51 allows the accumulator valve 40 to move rearward.
Thereafter, the elastic protrusion 51 elastically deforms radially inward as the pressure in the accumulator chamber S2 decreases, thereby allowing the rear protrusion 44 to be biased forward by the elastic protrusion 51, thereby enabling the accumulator valve 40 to move forward in a restoring state.

The pair of elastic arm portions 52 are arranged on both sides of the injection tube portion 20 in the left-right direction L2. When viewed from the side in the left-right direction L2, the pair of elastic arm portions 52 are elastically deformed to form an upwardly protruding arc shape, with their front ends (lower ends) housed within the receiving portion 67 of the trigger portion 61. As a result, the elastic arm portion 52 is housed within the receiving portion 67 in a state in which it is flexibly deformed starting from the rear end side, and the front end is elastically displaced in the front-rear direction L1 as the trigger portion 61 is operated. As a result, the elastic arm portion 52 biases the trigger portion 61 forward.

Furthermore, a connecting wall 56 is formed on the lower portion of the blocking wall 53, extending forward and connecting the pair of elastic arm portions 52 to each other in the left-right direction L2. As a result, the rear ends of the pair of elastic arm portions 52 are connected together via the connecting wall 56, ensuring a predetermined rigidity.
The blocking wall 53 enters from the rear into the fitting space 24 formed between the lower part of the rear tube portion 22 and the top wall portion 11e of the outer tube 11, and is fitted into the fitting space 24. Therefore, the entire blocking member 50 is combined with the injection tube portion 20 in a state in which rattling in the up and down direction is suppressed.

Furthermore, second locking projections (second locking portions) 57 are formed downward on the rear end sides of the pair of elastic arm portions 52. The second locking projections 57 are locked to side projections (side portions) 58 of the ejector main body 2 from the front.
The side protrusions 58 are formed on portions of the outer peripheral surface of the cylinder tube portion 15 that are located on both sides in the left-right direction L2 with the injection tube portion 20 in between. That is, the side protrusions 58 are formed on portions of the outer peripheral surface of the cylinder tube portion 15 that are located on both radial sides of the injection tube portion 20 with the injection tube portion 20 in between, when viewed from above the ejector body 2.

As described above, the blocking wall 53 is assembled to the injection tube portion 20 in a state in which it is prevented from slipping out rearward by the first locking projection 55 and the second locking projection 57.

(Nozzle part)
1 and 2, the nozzle portion 3 is attached to the second relay cylindrical portion 83. As a result, the nozzle portion 3 is attached to the ejector main body 2 via the relay member 80.
The nozzle portion 3 is disposed forward of the opposing wall portion 81 of the relay member 80 and includes a nozzle wall portion 90 in which the ejection hole 4 is formed, and an outer fitting tube portion 91 that extends rearward from the nozzle wall portion 90 and is fitted from the front onto the second relay tube portion 83. The inside of the second relay tube portion 83 is capable of communicating with the inside of the injection tube portion 20 through a communication hole 85.
The outer fitting cylinder portion 91 is attached rotatably about the axis O3 in a state in which it is prevented from slipping out of the second relay cylinder portion 83. As a result, the nozzle portion 3 is combined with the relay member 80 rotatably about the axis O3.

Furthermore, an inner cylinder portion 92 that fits rotatably around the guide shaft 84 is protruded rearward from a portion of the nozzle wall portion 90 that is located inside the outer fitting cylinder portion 91. A second switching groove 93 extending along the front-to-rear direction L1 is formed on the inner peripheral surface of the inner cylinder portion 92. Furthermore, a spin chamber 94 that can communicate with the first switching groove 86 is formed in a concave shape on a portion of the rear surface of the nozzle wall portion 90 that is located inside the inner cylinder portion 92.

The first switching groove 86 formed in the guide shaft 84 and the second switching groove 93 formed in the inner cylinder portion 92 are connected at a predetermined rotational position of the nozzle portion 3 centered on the axis O3, and are not connected at other rotational positions.
The first switching groove 86 and the second switching groove 93 communicate with each other, so that the ejection hole 4 and the inside of the second relay tube portion 83 communicate with each other through the spin chamber 94, the first switching groove 86, and the second switching groove 93. Therefore, the nozzle portion 3 can switch, as it rotates about the axis O3, between an ejection permissive state in which ejection of liquid from the ejection hole 4 is permitted, and an ejection restricted state in which ejection is restricted.

(Cover body)
As shown in FIG. 1, the cover body 5 is formed to cover the entire vertical supply tube portion 10 except for the lower end portion and the entire injection tube portion 20 at least from both sides in the left-right direction L2 and from above.

(Function of trigger-type liquid ejector)
Next, a case where the trigger type liquid ejector 1 configured as described above is used will be described. It is assumed that by operating the trigger part 61 shown in Fig. 1 multiple times, liquid is filled into each part of the trigger type liquid ejector 1, and the liquid can be sucked up into the vertical supply tube part 10.

As shown in FIG. 4, when the trigger portion 61 is pulled backward against the force of the elastic arm portion 52 as shown by the arrow F, the main piston 63 moves backward from the forwardmost position, and the inside of the main cylinder 62 is pressurized. This allows the liquid in the main cylinder 62 to be supplied to the vertical supply tube portion 10, and also pushes the ball valve 70 downward and against the tapered tube 71.

This allows the liquid supplied into the vertical supply tube 10 to be supplied into the injection tube 20 through the connection tube 11d and the through hole 23. That is, the liquid supplied into the vertical supply tube 10 can be introduced into the pressure accumulation chamber S2, including the gap S1. At this time, since the injection opening 21 is closed by the seal portion 42 of the pressure accumulation valve main body 41, the pressure in the pressure accumulation chamber S2 can be increased by the liquid introduced into the pressure accumulation chamber S2.

Then, when the pressure in the accumulator chamber S2 exceeds a predetermined value, as shown in Fig. 4, the elastic protrusion 51 elastically deforms so as to bend radially outward in the injection tube portion 20 while moving along the tapered surface 44a of the rear protrusion portion 44. This allows the accumulator valve 40 to move rearward against the bias of the elastic protrusion 51. This allows the seal portion 42 to move rearward away from the injection opening 21, and the injection opening 21 to be opened.
Therefore, the pressurized liquid can be forcefully ejected from the ejection tube portion 20 through the ejection opening 21 into the second relay tube portion 83, and can also be guided to the ejection hole 4 through the second switching groove 93, the first switching groove 86 and the spin chamber 94, and can be ejected from the ejection hole 4 to the outside.

After the liquid is ejected, the trigger portion 61 can be released to stop the supply of liquid from the main cylinder 62 through the vertical supply tube portion 10 to the injection tube portion 20. This reduces the pressure in the accumulator chamber S2, causing the elastic protrusion 51 to elastically restore and deform. This allows the rear protrusion 44 to be biased forward by the elastic protrusion 51, and the accumulator valve 40 to move forward and restore. This allows the injection opening 21 to be closed again using the seal portion 42, as shown in FIG. 1.

Furthermore, the elastic restoring force of the elastic arm portion 52 can urge the trigger portion 61 forward, causing the trigger portion 61 to move back to its original position. Therefore, in conjunction with the trigger portion 61, the main piston 63 can move back to its original position forward within the main cylinder 62. This can reduce the pressure within the main cylinder 62 to a pressure lower than the pressure within the container body A, causing the ball valve 70 to rise and move away from the tapered tube 71. Therefore, the liquid within the container body A can be sucked up into the vertical supply tube portion 10 and introduced into the main cylinder 62. This makes it possible to prepare for the next ejection.

As described above, according to the trigger-type liquid ejector 1 of this embodiment, liquid can be ejected from the ejection hole 4 each time the trigger portion 61 is pulled backward. In particular, since the device is provided with the pressure accumulator valve 40, the pressure of the liquid ejected from the ejection hole 4 can be stabilized, and the liquid can be ejected in the desired form (e.g., as a mist, etc.).

Moreover, since the accumulator valve 40 is provided inside the injection tube portion 20, the nozzle portion 3 can be made smaller and the structure can be simplified compared to the conventional case in which the accumulator valve 40 is provided inside the nozzle portion 3, and for example, bulkiness of the nozzle portion 3 in the front-rear direction L1, the left-right direction L2, and the up-down direction can be easily suppressed. Therefore, the entire trigger-type liquid ejector 1 can be made smaller.
Furthermore, by providing the accumulator valve 40 inside the ejection tube portion 20, it is possible to increase the degree of freedom in the structure of the nozzle portion 3. Therefore, as the trigger-type liquid ejector 1, for example, as in this embodiment, a configuration in which the rotation of the nozzle portion 3 switches between an ejection permitted state in which ejection from the ejection hole 4 is permitted and an ejection restricted state in which ejection is restricted can be easily adopted.

Furthermore, because the pressure accumulator valve 40 is provided inside the injection tube portion 20, the internal volume of the injection tube portion 20 can be reduced without increasing the number of parts. This allows the pressure of the liquid inside the injection tube portion 20 (inside the pressure accumulator chamber S2) to be quickly increased when the trigger portion 61 is operated, reducing the number of priming operations. Furthermore, because air is less likely to remain inside the injection tube portion 20, it is possible to suppress variations in the amount of ejection caused by remaining air, dripping from the ejection hole 4, and the like.

Furthermore, the blocking member 50 has an elastic arm portion 52 that biases the trigger portion 61 forward from the rear of the injection tube portion 20. Therefore, there is no need to separately provide a biasing member or the like that biases the trigger portion 61 forward, which can reduce the number of parts and also lead to lower costs.
In particular, since the blocking member 50 having the elastic projection 51 and the elastic arm portion 52 can be handled as a single unit, it is possible to reduce the number of parts and improve the ease of assembly.

Furthermore, since the pressure accumulator valve body 41 is disposed over the entire length of the injection tube portion 20, the internal volume of the injection tube portion 20 can be further reduced. Therefore, the number of priming operations can be more effectively reduced, and air remaining inside the injection tube portion 20 can be suppressed.

Furthermore, the blocking member 50 is prevented from coming off rearward from the injection tube portion 20 by the first locking projection 55 and the second locking projection 57 locking at multiple points. Therefore, the trigger portion 61 can be more stably biased forward by utilizing the elastic arm portion 52, and the blocking member 50 can be easily stabilized without rattling when the trigger portion 61 is operated rearward. Furthermore, because the blocking member 50 can be more stably combined with the injection tube portion 20, the sealing between the injection tube portion 20 and the blocking member 50 can be more firmly ensured, improving product reliability.

Although the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. The embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. Examples of the embodiments and their variations include those that can be easily imagined by a person skilled in the art, those that are substantially the same, and those that are within the scope of equivalents.

For example, in the above embodiment, an example was given of the case where the pressure accumulator valve main body 41 is provided over the entire length of the injection tube portion 20, but this is not limited to this case, and the pressure accumulator valve main body 41 may be arranged, for example, in only a part of the injection tube portion 20 in the fore-and-aft direction L1.
Furthermore, in the above embodiment, the trigger mechanism 60 including the main cylinder 62 and the main piston 63 has been described as an example, but the present invention is not limited to this case. For example, a configuration may be adopted in which the liquid in the container body A is circulated from inside the vertical supply tube portion 10 through the injection tube portion 20 toward the ejection hole 4 side by a trigger mechanism including a pump that contracts and deforms like a bellows.

Furthermore, in the above embodiment, a trigger-type liquid ejector 1 that ejects liquid from the ejection hole 4 in a forward direction has been described, but this is not limited to this case, and the trigger-type liquid ejector 1 may also eject liquid in a direction other than forward, such as upward or to the left.

Furthermore, in the above embodiment, the elastic protrusion 51 is used as an example of an elastic body, but this is not limited to this case, and an elastic member such as a leaf spring may be integrally formed with the blocking wall 53.

Furthermore, in the above embodiment, a member such as a nozzle tip may be provided on the nozzle portion 3, and a spin groove may be formed to apply spin to the liquid ejected from the ejection hole 4.

A: Container body 1: Trigger type liquid ejector 2: Ejector body 3: Nozzle portion 4: Ejection hole 10: Vertical supply tube portion (supply tube portion)
20: Injection tube portion 21: Injection opening 40: Accumulator valve 50: Closing member 51: Elastic protrusion (elastic body)
52: Elastic arm portion 55: First locking projection (first locking portion)
57...Second locking protrusion (second locking part)
60: trigger mechanism 61: trigger part

Claims (4)

An ejector body that is attached to a container that contains a liquid;
a nozzle portion attached to the ejector body and having an ejection hole for ejecting liquid;
The ejector body includes:
A supply tube portion that sucks up the liquid in the container body;
an injection tube portion extending from the supply tube portion and having an injection opening portion opening to the outside of the ejector body;
a trigger mechanism including a trigger portion that is arranged to be movable rearward while being biased forward by an elastic arm portion, and that causes liquid to flow from inside the supply tube portion through the injection tube portion toward the ejection hole side by the rearward movement of the trigger portion;
a pressure accumulator valve movably disposed within the injection tube portion and releasably closing the injection opening;
an elastic body that contacts the pressure accumulator valve from behind,
the elastic body is elastically deformed due to an increase in pressure in the injection tube portion, thereby allowing the pressure accumulator valve to move rearward and opening the injection opening portion, and is elastically deformed to restore its original shape as the pressure in the injection tube portion decreases, urging the pressure accumulator valve forward;
2. A trigger type liquid ejector, wherein the elastic body and the elastic arm portion are integrally formed. 2. The trigger type liquid ejector according to claim 1,
the ejector body includes a blocking member having a blocking wall that blocks the ejection tube portion from the rear,
the elastic body is disposed inside the injection tube portion and is integrally formed with the closing wall,
The elastic arm portion is disposed outside the ejection tube portion and is integrally formed with the closing wall. The trigger type liquid ejector according to claim 1 or 2,
A trigger-type liquid ejector, wherein the pressure accumulator valve is disposed within the ejection tube over the entire length of the ejection tube. 3. The trigger type liquid ejector according to claim 2 ,
The blocking member is
a first engaging portion engaged with an upper portion of the injection tube portion from the front;
A trigger-type liquid ejector comprising: a second engaging portion that, when viewed from above the ejector body, is engaged from the front with a side portion of the ejector body located on both radial sides of the ejection tube portion, sandwiching the ejection tube portion.

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