JP7565852B2 - Trigger-type liquid ejector - Google Patents

Description

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

The trigger-type liquid ejector comprises a vertical supply tube section extending in the vertical direction, a main cylinder provided in front of the vertical supply tube section, a storage cylinder provided above the vertical supply tube section and capable of communicating with the ejection hole, and a nozzle member having an ejection hole provided in front of the storage cylinder.
According to this configuration, when the trigger portion is pulled backward, the liquid contained in the main cylinder flows toward the storage cylinder. When the pressure in the storage cylinder increases due to the inflow of liquid into the storage cylinder, the liquid in the storage cylinder is discharged through the nozzle. Meanwhile, when the hand is released from the trigger portion and the trigger portion returns to the front, the liquid in the container body is sucked up into the vertical supply tube portion. The liquid sucked up into the vertical supply tube portion flows into the main cylinder.
In the trigger type liquid ejector, the above-mentioned operation is repeated to eject liquid continuously.

In the above-mentioned trigger-type liquid ejector, for example, the following Patent Document 1 discloses a configuration in which a ball valve that switches between communication and blocking between the vertical supply tube and the main cylinder, and an ejection valve that switches between communication and blocking between the vertical supply tube and the storage cylinder are provided in the vertical supply tube.

JP 2018-89549 A

However, in the configuration of Patent Document 1 mentioned above, both the ball valve and the ejection valve are provided inside the vertical supply tube, so there is still room for improvement in terms of making the trigger-type liquid ejector smaller in the vertical direction.

The present invention provides a trigger-type liquid ejector that can be made smaller in the vertical direction.

In order to solve the above problems, the present disclosure employs the following aspects.
A trigger type liquid ejector according to one aspect of the present disclosure comprises an ejector body attached to a container body that contains liquid, and a nozzle member attached to a front end of the ejector body and having an ejection hole formed therein for ejecting liquid forward, the ejector body having a vertical supply tube portion extending in a vertical direction, and a trigger portion provided in front of the vertical supply tube portion so as to be movable rearward in a forward biased state, the trigger portion moving rearward to cause liquid to flow from within the vertical supply tube portion toward the ejection hole side, and a trigger mechanism provided above the vertical supply tube portion and configured to move the vertical supply tube portion rearward as the trigger portion moves rearward. The device comprises a storage cylinder into which liquid that has passed through the supply tube portion flows, and a storage plunger that is provided within the storage cylinder and is biased toward one axial side along the axis of the storage cylinder and can move to the other axial side as liquid is supplied into the storage cylinder, wherein a communication passage is formed in the storage plunger to connect a first space, which is capable of connecting to the vertical supply tube portion, and a second space, which is capable of connecting to the ejection hole, within the inner space of the storage cylinder, and a valve member is provided within the communication passage to switch between communication and blocking between the first space and the second space.

According to this aspect, since a valve member is provided in the communication passage that connects the first space and the second space, the vertical dimension of the vertical supply tube section can be reduced compared to when a valve member is provided in the vertical supply tube section. This allows the trigger-type liquid ejector to be made smaller in size in the vertical direction.

In the trigger type liquid ejector of the above aspect, it is preferable that the valve member is provided so as to be displaceable in the axial direction.
According to this aspect, the trigger type liquid ejector can be made smaller in size in a direction intersecting the axis (for example, the vertical direction) compared to a configuration in which the valve member is displaced in a direction intersecting the axis.

In the trigger-type liquid ejector of the above aspect, it is preferable that the nozzle member is formed with an opening that opens into the second space, and the storage plunger is provided with a plug portion that switches between communication and blocking between the second space and the ejection hole through the opening by moving toward and away from the opening edge of the opening as the storage plunger moves in the axial direction within the storage cylinder.
According to this aspect, the second space and the ejection hole are directly connected through the opening. This allows the trigger type liquid ejector to be made smaller in the axial direction. In this case, for example, if the trigger type liquid ejector is subjected to a drop impact, the moment acting on the trigger type liquid ejector from the connection part between the vertical supply tube part and the storage pump part can be reduced.

According to this aspect of the present invention, it is possible to reduce the size in the vertical direction.

1 is a vertical cross-sectional view of a trigger type liquid ejector according to a first embodiment. FIG. FIG. 2 is a partially enlarged view of FIG. FIG. 11 is an enlarged view of a main part of a trigger type liquid ejector according to a second embodiment.

Embodiments of the present invention will be described below with reference to the drawings. In the embodiments and variations described below, the same reference numerals may be used to designate corresponding configurations, and descriptions thereof may be omitted.

First Embodiment
1, the trigger type liquid ejector 1 of this embodiment is capable of continuously ejecting liquid contained in a container body A. The trigger type liquid ejector 1 includes an ejector body 10, a nozzle member 11, and a cover 13.
Unless otherwise specified, each component part of the trigger type liquid ejector 1 is a molded product made of synthetic resin.

The ejector body 10 includes a vertical supply tube section 20, an attachment cap 21, a pipe 22, a trigger mechanism 24 having a main pump section 23, and a storage pump section 25.

Hereinafter, the direction along the axis O1 of the vertical supply tube section 20 (axial direction) is referred to as the up-down direction, with the bottom (not shown) side of the container body A along the up-down direction being referred to as the lower side, and the opposite side being referred to as the upper side. The direction intersecting the axis O1 when viewed from the up-down direction is referred to as the first radial direction. Within the first radial direction, the direction in which the vertical supply tube section 20 and the nozzle member 11 are aligned is referred to as the front-rear direction. Within the front-rear direction, the nozzle member 11 side relative to the vertical supply tube section 20 is referred to as the front side, and the opposite side is referred to as the rear side. Additionally, within the first radial direction, the direction perpendicular to the front-rear direction when viewed from the up-down direction is referred to as the left-right direction.

The vertical supply tube section 20 sucks up the liquid in the container body A through the mouth section A1 of the container body A. The vertical supply tube section 20 is formed in a multi-stage tube shape with the diameter decreasing as it moves upward. Specifically, the vertical supply tube section 20 has a small diameter section 20a located at the top and a large diameter section 20c connected to the lower side of the small diameter section 20a via a step section 20b. In this embodiment, the vertical supply tube section 20 has a double tube structure consisting of an outer tube and an inner tube arranged inside the outer tube below the storage pump section 25.

The large diameter portion 20c is provided with a flange portion 20d that protrudes outward in the first radial direction.
A ball valve 28 is provided at the upper end of the small diameter portion 20a. The ball valve 28 approaches and separates from the valve seat portion 20e protruding into the small diameter portion 20a from above. In the small diameter portion 20a, the ball valve 28 switches between communication and blocking between the inside of the container body A and the main pump portion 23 or the storage pump portion 25 through the vertical supply tube portion 20. Specifically, when the ball valve 28 is in a state where it is separated upward from the valve seat portion 20e, it allows the liquid to flow from the inside of the container body A to the main pump portion 23 or the storage pump portion 25 through the vertical supply tube portion 20. When the ball valve 28 is seated on the valve seat portion 20e, it regulates the flow of the liquid from the main pump portion 23 or the storage pump portion 25 to the inside of the container body A through the vertical supply tube portion 20. The ball valve 28 is formed of metal, synthetic resin, or the like.

In the small diameter portion 20a, a rise regulating portion 20f is provided in a portion located above the ball valve 28. The rise regulating portion 20f is connected to a support piece 20g that crosses the upper end opening edge of the small diameter portion 20a in the first radial direction. The rise regulating portion 20f extends downward from a portion of the support piece 20g that is located on the axis O1. The lower end of the rise regulating portion 20f faces the ball valve 28 with a gap between them. The rise regulating portion 20f restricts the upward movement of the ball valve 28 by the ball valve 28 abutting against it from below. Note that the rise regulating portion 20f may be configured to cross the small diameter portion 20a in the first radial direction at the regulating position of the ball valve 28, for example.

The step portion 20b is provided with an engagement piece 26. The engagement piece 26 extends rearward from the step portion 20b in a cantilever fashion.

The mounting cap 21 is formed in a cylindrical shape extending in the vertical direction. The mounting cap 21 is removably fastened to the mouth portion A1 of the container body A with the flange portion 20d sandwiched between the mounting cap 21 and the upper end opening edge of the mouth portion A1 of the container body A. Note that the method of fixing the mounting cap 21 to the mouth portion A1 may be a method other than a screw (e.g., fitting, etc.). In the illustrated example, the axis O1 of the vertical supply tube portion 20 is located rearward of the container axis of the container body A.

The pipe 22 is inserted into the vertical supply tube section 20 through the inside of the large diameter section 20c and fitted into the small diameter section 20a from below. When the trigger-type liquid ejector 1 is attached to the container body A, the pipe 22 extends downward inside the container body A.

The trigger mechanism 24 includes a main pump portion 23 and a trigger portion 30 .
The main pump unit 23 stores and pumps the liquid in the container body A in response to a pulling operation (pulling backward) of the trigger unit 30. The main pump unit 23 includes a main cylinder 31, a main piston 32, a communication tube 33, and a main biasing member 34.
The main cylinder 31 is provided in front of the small diameter portion 20a of the vertical supply tube portion 20. The main cylinder 31 is formed in a bottomed cylindrical shape that opens forward.
The main piston 32 is provided so as to be movable back and forth relative to the main cylinder 31. The main piston 32 is formed in a cylindrical shape with a top that opens to the rear. The main piston 32 slides on the inner circumferential surface of the main cylinder 31 as it moves back and forth relative to the main cylinder 31. The inside of the main cylinder 31 is pressurized as the main piston 32 moves backward, and is depressurized as the main piston 32 moves forward.

The communication tube 33 extends rearward from the rear end bottom wall of the main cylinder 31. The front end opening of the communication tube 33 is open toward the inside of the main cylinder 31 on the rear end bottom wall of the main cylinder 31. The rear end of the communication tube 33 is inserted into a portion of the small diameter section 20a that is located above the ball valve 28. The rear end opening of the communication tube 33 is open inside the vertical supply tube section 20. In other words, the inside of the main cylinder 31 and the inside of the vertical supply tube section 20 are connected through the communication tube 33. In the illustrated example, the communication tube 33 is located at the same height as the lower end of the rise restriction section 20f.

The main biasing member 34 is a coil spring made of, for example, a metal material. The main biasing member 34 is arranged coaxially with the main cylinder 31 and the main piston 32. It is interposed between the main cylinder 31 and the main piston 32 and biases the main piston 32 forward. The main pump section 23 is provided with a mechanism for recovering the initial air and liquid contents in the main cylinder 31 into the container body A, etc., when the main piston 32 moves to the rear end position.

The trigger section 30 is provided in front of the vertical supply tube section 20 in a forward biased state so as to be movable backward. The trigger section 30 extends while curving forward as it goes downward. The upper end of the trigger section 30 is supported by the storage pump section 25 (for example, the horizontal supply tube section 55 described later) so as to be swingable around an axis extending in the left-right direction. Therefore, the trigger section 30 moves in the front-rear direction by rotating around the horizontal supply tube section 55 as a fulcrum. The front end of the main piston 32 is connected to the center of the trigger section 30 in the up-down direction. As the trigger section 30 moves backward, it pushes the main piston 32 backward. Meanwhile, the trigger section 30 moves forward together with the main piston 32 as the forward biasing force of the main biasing member 34 acts via the main piston 32.

The reservoir pump section 25 is connected to the upper part of the vertical supply tube section 20. The reservoir pump section 25 stores and pumps the liquid supplied from the main pump section 23 in response to the pulling operation of the trigger section 30. The reservoir pump section 25 includes a reservoir cylinder 51, a reservoir plunger 52, a reservoir biasing member 53, and a valve member 54.
The storage cylinder 51 is formed in a double cylindrical shape that opens forward with the axis O2 aligned in the front-rear direction (axial direction). Specifically, the storage cylinder 51 includes a lateral supply tube portion 55 and a cylinder main body tube 56.

As shown in FIG. 2, the horizontal supply tube section 55 has a peripheral wall 55a and a bottom wall 55b, and is formed into a bottomed tube shape that opens forward. The rear part of the horizontal supply tube section 55 is connected to the upper end of the vertical supply tube section 20. In this embodiment, the horizontal supply tube section 55 is formed integrally with a part (outer tube part) of the vertical supply tube section 20. In the following description, the direction that intersects with the axis O2 when viewed from the front-to-rear direction may be referred to as the second radial direction.

The peripheral wall 55a of the lateral supply tube portion 55 is formed in a multi-stage cylindrical shape in which the inner diameter increases toward the front.
The reduced diameter portion 60 constitutes the rear end portion of the peripheral wall 55a (a portion of the peripheral wall 55a that is located rearward of the connection portion with the vertical supply tube portion 20).
The enlarged diameter portion 61 extends forward from the front end of the reduced diameter portion 60. The inner diameter of the enlarged diameter portion 61 is larger than that of the reduced diameter portion 60.

The cylinder body tube 56 is arranged coaxially with the axis O2 and extends in the front-rear direction inside the horizontal supply tube section 55. The rear end of the cylinder body tube 56 is fitted into the reduced diameter section 60. As a result, a communication passage 65 is formed between the outer circumferential surface of the cylinder body tube 56 and the inner circumferential surface of the expanded diameter section 61 at the front of the cylinder body tube 56 (the portion located forward of the reduced diameter section 60). The communication passage 65 surrounds the entire periphery of the cylinder body tube 56 and extends in the front-rear direction. The upper end opening of the vertical supply tube section 20 opens at the rear end of the communication passage 65.

An inlet 56a is formed at the front end of the cylinder body tube 56. The inlet 56a penetrates the cylinder body tube 56 in the vertical direction (second radial direction). The inlet 56a connects the communication passage 65 to the inside of the cylinder body tube 56. In the illustrated example, the inlet 56a is formed at the upper part of the cylinder body tube 56. That is, the inlet 56a is located on the opposite side of the vertical supply tube section 20 across the axis O2 in the vertical direction and is located forward of the vertical supply tube section 20. This allows the communication passage 65 to be efficiently filled with liquid and prevents air pockets from forming in the communication passage 65. Note that one or more inlet ports 56a may be formed at any position around the axis O2 in the cylinder body tube 56.

The storage plunger 52 is provided so as to be movable back and forth in a portion located forward of the axis O1 inside the storage cylinder 51. The storage plunger 52 includes a rear sliding member 71 and a front sliding member 72.
The rear sliding member 71 is formed in a cylindrical shape with a central portion in the front-rear direction partitioned as a whole. The rear sliding member 71 includes a base cylinder portion 81, a valve accommodating portion 82, a through cylinder 83, and a rear lip portion 84.

The base tube portion 81 is formed in a cylindrical shape and is arranged coaxially with the axis O2. The base tube portion 81 is arranged with a gap in the second radial direction between it and the inner peripheral surface of the cylinder body tube 56. In the illustrated example, the dimension in the second radial direction between the outer peripheral surface of the base tube portion 81 and the inner peripheral surface of the cylinder body tube 56 is larger than the dimension in the second radial direction of the communication passage 65.

The valve accommodating portion 82 is formed in a bottomed tubular shape that opens forward inside the base tubular portion 81. The valve accommodating portion 82 divides the inside of the base tubular portion 81 in the front-rear direction. Specifically, the valve accommodating portion 82 includes an inner flange portion 82a, an enclosing tube 82b, and a partition bottom 82c.
The inner flange portion 82a protrudes inward in the second radial direction from the base tubular portion 81 at the front portion of the base tubular portion 81.
The surrounding cylinder 82b extends rearward from the inner end edge of the inner flange portion 82a in the second radial direction. The surrounding cylinder 82b is disposed coaxially with the axis O2.
The partition bottom 82c closes the rear end opening of the surrounding cylinder 82b.

The through tube 83 penetrates the upper part of the surrounding tube 82b and the base tube part 81 in the second radial direction. The through tube 83 communicates the inside and outside of the valve housing part 82 (the outer space of the base tube part 81, which is the part surrounded by the cylinder main body tube 56, and the inner space of the valve housing part 82). The through tube 83 overlaps with the inlet 56a in a plan view seen from the top and bottom direction. In the illustrated example, the inner diameter of the through tube 83 is smaller than the inner diameter of the inlet 56a. However, the position and shape of the through tube 83 and the inlet 56a can be appropriately changed as long as they are configured to be able to communicate with each other. For example, the through tube 83 and the inlet 56a may be arranged offset in the front-back direction or around the axis O2. In addition, the through tube 83 may be provided in a plurality of positions around the axis O2 as long as they are configured to communicate the inside and outside of the valve housing part 82.

The rear lip portion 84 protrudes outward in the second radial direction from a portion of the base tube portion 81 that is located rearward of the valve housing portion 82. The outer peripheral edge of the rear lip portion 84 is in close contact with the inner peripheral surface of the cylinder body tube 56. The rear lip portion 84 slides in the front-rear direction on the inner peripheral surface of the cylinder body tube 56 as the storage plunger 52 moves back and forth.

The front sliding member 72 is attached to the rear sliding member 71 from the front and moves back and forth together with the rear sliding member 71. The front sliding member 72 is formed in a multi-stage, topped cylinder shape with an outer diameter that decreases as it moves further forward. Specifically, the front sliding member 72 includes a fitting cylinder 91, a pressure-receiving portion 92, a front lip portion 93, a protruding cylinder 94, and a plug portion 95.

The fitting cylinder 91 is disposed coaxially with the axis O2. The base cylinder portion 81 is fitted into the fitting cylinder 91 from the rear.
The pressure receiving portion 92 is formed in an annular shape that protrudes inward in the second radial direction from the front end edge of the fitting tube 91. The front end opening edge of the base tube portion 81 is in close proximity to or in contact with the rear surface of the pressure receiving portion 92 from behind.
The front lip portion 93 extends outward in the second radial direction from the pressure receiving portion 92. The outer peripheral edge of the front lip portion 93 is in close contact with the inner peripheral surface of the cylinder body tube 56. The front lip portion 93 slides in the front-rear direction on the inner peripheral surface of the cylinder body tube 56 in accordance with the front-rear movement of the storage plunger 52. A guide rib 97 is provided on a portion of the front sliding member 72 that is outside the fitting tube 91 and located behind the front lip portion 93. The guide rib 97 protrudes outward in the second radial direction from the outer peripheral surface of the fitting tube 91 and extends in the front-rear direction. The outer peripheral edge of the guide rib 97 is close to the inner peripheral surface of the cylinder body tube 56.

The protruding tube 94 extends forward from the inner peripheral edge of the pressure receiving portion 92. The protruding tube 94 is arranged coaxially with the axis O2 and is formed into a tapered tube shape whose outer diameter decreases toward the front. A through hole 94a is formed in the rear end portion of the protruding tube 94 (the portion connected to the pressure receiving portion 92). The through holes 94a are formed at intervals around the axis O2.

The plug portion 95 protrudes forward from the front end opening edge of the protruding tube 94. The plug portion 95 is disposed coaxially with the axis O2 and is formed in a truncated cone shape whose outer diameter decreases toward the front.

The storage biasing member 53 is housed in a portion of the storage cylinder 51 that is located rearward of the rear lip portion 84. The storage biasing member 53 is, for example, a coil spring made of a metal material. The storage biasing member 53 is disposed coaxially with the axis O2. The storage biasing member 53 is interposed between the rear lip portion 84 and the bottom wall 55b, and biases the storage plunger 52 forward.

1, in the ejector body 10, a cylinder lower rib 85 that connects the large diameter portion 20c and the main cylinder 31 is provided in a portion located between the large diameter portion 20c and the main cylinder 31. The cylinder lower rib 85 protrudes downward from the lower portion of the main cylinder 31 and extends rearward. The rear end edge of the cylinder lower rib 85 is connected to the front portion of the large diameter portion 20c.
In the ejector body 10, a cylinder upper rib 86 that connects the main cylinder 31 and the storage cylinder 51 is provided in a portion located between the main cylinder 31 and the storage cylinder 51. The cylinder upper rib 86 protrudes downward from the lower portion of the lateral supply tube portion 55 and extends in the front-rear direction. The lower end edge of the cylinder upper rib 86 is continuous with the upper portion of the main cylinder 31. The rear end edge of the cylinder upper rib 86 is continuous with the small diameter portion 20a.

In the ejector body 10, a lower rib 87 is provided at a portion located between the engagement piece 26 and the small diameter portion 20a, connecting the engagement piece 26 and the small diameter portion 20a. The lower rib 87 protrudes rearward from the small diameter portion 20a and extends downward. In a side view, the lower rib 87 is formed in a triangular shape whose front-to-rear dimension increases downward. The lower edge of the lower rib 87 is connected to the engagement piece 26.
In the ejector body 10, an upper rib 88 is provided in a portion located between the vertical supply tube portion 20 and the storage cylinder 51, connecting the vertical supply tube portion 20 and the storage cylinder 51. The upper rib 88 protrudes rearward from a portion of the small diameter portion 20a located above the lower rib 87 and extends upward. In a side view, the upper rib 88 is formed in a triangular shape whose front-to-rear dimension increases toward the top. The upper edge of the upper rib 88 is connected to the reduced diameter portion 60 of the horizontal supply tube portion 55.

As shown in FIG. 2, the nozzle member 11 is attached to the storage cylinder 51 from the front. The nozzle member 11 has an ejection hole 106a that ejects liquid that has passed through the vertical supply tube portion 20 and the storage pump portion 25. Specifically, the nozzle member 11 has an attachment tube 100, a connecting ring 101, an outer seal tube 102, an inner seal tube 103, a blocking portion 104, a nozzle shaft 105, and a nozzle tip 106.

The mounting cylinder 100 is disposed coaxially with the axis O2. The front end of the lateral supply cylinder portion 55 is fitted into the mounting cylinder 100 from the rear.
The connecting ring 101 protrudes inward in the second radial direction from the front end edge of the mounting tube 100. The inner end edge of the connecting ring 101 in the second radial direction is located more inward than the cylinder main body tube 56 in the second radial direction.

The outer seal tube 102 extends rearward from a portion of the connecting ring 101 that is located inside the mounting tube 100 in the second radial direction. The outer seal tube 102 is arranged coaxially with the axis O2. The outer seal tube 102 is tightly fitted between the lateral supply tube portion 55 and the cylinder body tube 56. The outer seal tube 102 blocks the communication passage 65 from the front, in front of the inlet 56a.

The inner seal tube 103 extends rearward from the inner peripheral edge of the connecting ring 101. The inner seal tube 103 is disposed coaxially with the axis O2. The inner seal tube 103 is tightly fitted into the inside of the cylinder main body 56.
The blocking portion 104 protrudes inward in the second radial direction from the rear end opening edge of the inner seal cylinder 103.

The nozzle shaft 105 is formed in a cylindrical shape and disposed coaxially with the axis O2. The nozzle shaft 105 penetrates the blocking portion 104 in the front-rear direction.
The nozzle tip 106 is formed in a cylindrical shape with a top and is disposed coaxially with the axis O2. The nozzle tip 106 is fitted onto the nozzle shaft 105. An ejection hole 106a is formed in the top of the nozzle tip 106 at a portion located on the axis O2.

In this embodiment, the storage plunger 52 divides the inner space of the storage cylinder 51 into a supply space 130a and a storage space 130b. The supply space 130a is a space inside the communication passage 65, the inlet 56a, and the cylinder body 56, and is surrounded by the lip portions 84 and 93. The supply space 130a communicates with the vertical supply tube portion 20 at the rear end.
The storage space 130b is an inner space of the cylinder main body 56, and is a space surrounded by the nozzle member 11 and the front sliding member 72. The storage space 130b is configured to be able to communicate with the ejection hole 106a through the nozzle shaft 105. That is, the rear end opening of the nozzle shaft 105 functions as an opening 105a that opens toward the storage space 130b.

The outer periphery of the protruding tube 94 comes into contact with and separates from the opening edge of the open port 105a (the rear end opening edge of the nozzle shaft 105) as the storage plunger 52 moves back and forth. In other words, as the storage plunger 52 moves back and forth within the storage cylinder 51, communication between the storage space 130b and the ejection hole 106a through the nozzle shaft 105 is switched between open and closed.

Here, the storage plunger 52 is provided with a communication passage 140 that connects the supply space 130a and the storage space 130b. The communication passage 140 is a portion that extends from the through tube 83 through the valve housing portion 82 and the front end portion of the base tube portion 81 to the through hole 94a.

The inside of the communication passage 140 is divided by the valve member 54 into an upstream space 140a communicating with the supply space 130a, and a downstream space 140b communicating with the storage space 130b. The upstream space 140a is a space extending from the through tube 83 to the valve accommodating portion 82. The upstream space 140a is constantly in communication with the supply space 130a (the upstream space 140a and the supply space 130a are at the same pressure).
The downstream space 140b is a space that extends from the front end of the base tubular portion 81 to the through hole 94a through the inside of the protruding tube 94. The downstream space 140b is constantly in communication with the storage space 130b (the downstream space 140b and the storage space 130b are at the same pressure).

The valve member 54 switches between communication and blocking between the upstream space 140a and the downstream space 140b. The valve member 54 is integrally formed from an elastically deformable material such as rubber. Specifically, the valve member 54 includes a fixed portion 131, a deformable portion 132, and a valve body portion 133.

The fixing part 131 is fitted into the front end part of the base tube part 81. An outer circumferential part of the fixing part 131 is supported from the front by an inner circumferential part of the pressure receiving part 92. A communication groove 131a that communicates between the inside of the base tube part 81 and the through hole 94a is formed in a part of the fixing part 131 that overlaps with the through hole 94a when viewed from the front-rear direction.
The deformation portion 132 extends rearward from the fixed portion 131 inside the base tubular portion 81. The deformation portion 132 is configured to be elastically deformable in the front-rear direction.

The valve body 133 is connected to the rear end of the deformation portion 132. The valve body 133 is elastically displaced in the front-rear direction in accordance with the deformation of the deformation portion 132. The valve body 133 is formed in a truncated cone shape that gradually tapers toward the rear. The rear portion of the valve body 133 is housed in the valve housing portion 82. The front end of the valve body 133 is formed with a valve plate portion 133a that protrudes outward in the second radial direction. The valve plate portion 133a moves toward and away from the inner flange portion 82a from the front in accordance with the elastic displacement of the valve body 133. In other words, the valve member 54 blocks communication between the upstream space 140a and the downstream space 140b when the valve plate portion 133a is seated on the inner flange portion 82a. As a result, communication between the supply space 130a and the storage space 130b through the communication passage 140 is blocked, while the valve member 54 connects the upstream space 140a and the downstream space 140b by moving the valve plate portion 133a forward away from the inner flange portion 82a. As a result, the supply space 130a and the storage space 130b communicate with each other through the communication passage 140.

The cover 13 covers the portion of the ejector body 10 located above the mounting cap 21 from above, behind, and on both the left and right sides. The lower end opening edge of the cover 13 is engaged with the engagement piece 26 described above.

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 portion 30 multiple times, each portion of the trigger-type liquid ejector 1 is filled with liquid, and the liquid can be sucked up into the vertical supply tube portion 20.

First, when the trigger portion 30 is pulled backward, the main piston 32 moves backward against the biasing force of the main biasing member 34, and the inside of the main cylinder 31 is pressurized. As a result, the liquid in the main cylinder 31 is supplied into the vertical supply tube portion 20 (small diameter portion 20a) through the communication tube 33. Then, the pressure of the liquid supplied to the small diameter portion 20a presses the ball valve 28 toward the valve seat portion 20e, blocking the communication between the inside of the container body A and the inside of the vertical supply tube portion 20. As a result, the liquid in the small diameter portion 20a flows upward through the vertical supply tube portion 20. As shown in FIG. 2, the liquid flowing through the vertical supply tube portion 20 flows into the communication passage 65 (supply space 130a) through the upper end opening of the vertical supply tube portion 20. The liquid that flows into the communication passage 65 flows into the cylinder body tube 56 through the inlet 56a.

The liquid that has flowed into the cylinder body tube 56 flows into the upstream space 140a through the through tube 83. This causes the upstream space 140a to be pressurized by the liquid. Then, the valve body portion 133 is pushed forward, and the valve body portion 133 moves forward against the biasing force of the deformation portion 132. This causes the valve body portion 133 (valve plate portion 133a) to move away from the inner flange portion 82a, and the upstream space 140a and the downstream space 140b become connected. As a result, the liquid in the upstream space 140a flows into the downstream space 140b, and the liquid in the downstream space 140b flows into the storage space 130b through the through hole 94a.

When liquid flows into the storage space 130b, the liquid is stored in the storage space 130b and the storage space 130b is pressurized. When the storage space 130b is pressurized, the storage plunger 52 moves rearward against the biasing force of the storage biasing member 53. This causes the plug portion 95 to move away from the opening edge of the open port 105a, and the storage space 130b and the ejection hole 106a communicate with each other through the inside of the nozzle shaft 105. As a result, the liquid in the storage space 130b is ejected through the ejection hole 106a.

When the pulling operation of the trigger part 30 is released, the main piston 32 moves forward inside the main cylinder 31 due to the biasing force of the main biasing member 34, and the trigger part 30 also moves forward. This reduces the pressure inside the main cylinder 31. This causes the ball valve 28 to float up from the valve seat 20e, and the inside of the container body A and the main cylinder 31 are connected. As a result, the liquid inside the container body A is sucked up into the vertical supply tube part 20. The liquid that flows into the vertical supply tube part 20 is introduced into the main cylinder 31 through the communication tube 33.

In this embodiment, liquid flows into the storage space 130b each time the trigger portion 30 is pulled. Some of the liquid that flows into the storage space 130b is ejected through the ejection hole 106a. Meanwhile, the remaining liquid that flows into the storage space 130b remains in the storage space 130b, increasing the pressure in the storage space 130b. This allows the storage plunger 52 to move further rearward, gradually storing liquid in the storage space 130b.

In this embodiment, when the front sliding member 72 is projected along the axis O2 (front-rear direction), the area of the portion facing the storage space 130b (the forward facing surfaces of the pressure receiving portion 92 and the front lip portion 93) is larger than the area of the portion facing the downstream space 140b (the rear facing surface of the plug portion 95 and the front end opening edge of the through hole 94a). Therefore, the force caused by the pressure in the storage space 130b tends to act rearward on the storage plunger 52. As a result, the storage plunger 52 can be moved rearward smoothly.

When the front lip portion 93 reaches a position rearward beyond the front end opening edge of the inlet 56a as the storage plunger 52 moves rearward, the storage space 130b and the inlet 56a (supply space 130a) are directly connected. This allows the ejection hole 106a and the inlet 56a to be directly connected without going through the valve housing portion 82 (communication passage 140), and allows the liquid in the storage space 130b to flow into the supply space 130a without going through the valve housing portion 82.

When the operation of the trigger unit 30 is stopped, the supply of liquid to the storage pump unit 25 through the vertical supply tube unit 20 is stopped, but the liquid stored in the storage space 130b continues to be sprayed from the spray hole 106a. In other words, even when the operation of the trigger unit 30 is stopped, the storage plunger 52 is pressed forward by the biasing force of the storage biasing member 53, so that the liquid in the storage space 130b continues to be pressurized by the storage plunger 52. As a result, the liquid in the storage space 130b continues to be sprayed through the spray hole 106a.

In this way, the trigger-type liquid ejector 1 can eject liquid not only when the trigger unit 30 is pulled backward, but also when the trigger unit 30 is not pulled, and can eject liquid continuously. The ejection of liquid stops when the stopper unit 95 abuts against the edge of the opening 105a and communication between the inside of the storage space 130b and the ejection hole 106a is blocked. In other words, when the pressure in the storage space 130b decreases as the liquid is ejected, the storage plunger 52 moves forward inside the storage cylinder 51 due to the biasing force of the storage biasing member 53. As a result, the stopper unit 95 abuts against the edge of the opening 105a and communication between the storage space 130b and the ejection hole 106a is blocked.

As described above, in the trigger-type liquid ejector 1 of this embodiment, the storage plunger 52 is formed with a communication passage 140 that connects the supply space 130a, which is in the inner space of the storage cylinder 51 and can communicate with the vertical supply tube section 20, and the storage space 130b, which can communicate with the ejection hole 106a, and the communication passage 140 is provided with a valve member 54 that switches between communication and blocking between the supply space 130a and the storage space 130b.
According to this configuration, since the valve member 54 is provided in the communication passage 140 that communicates the supply space 130a and the storage space 130b, the vertical dimension of the vertical supply tube portion 20 can be reduced compared to the case where a valve member is provided in the vertical supply tube portion 20. This allows the trigger-type liquid ejector 1 to be made smaller in size in the vertical direction.

In this embodiment, the valve member 54 is configured to be displaceable in a direction along the axis O2 of the storage cylinder 51 (in the front-rear direction).
With this configuration, the trigger type liquid ejector 1 can be made smaller in size in the direction intersecting the axis O2 (the up-down direction) compared to a configuration in which the valve member 54 is displaced in a direction intersecting the axis O2.

In this embodiment, the storage plunger 52 is configured to have a plug portion 95 that switches between communication and blocking between the storage space 130b and the ejection hole 106a through the open port 105a by moving toward and away from the opening edge of the open port 105a as the storage plunger 52 moves forward and backward within the storage cylinder 51.
According to this configuration, the storage space 130b and the ejection hole 106a are directly connected through the open port 105a. This allows the trigger type liquid ejector 1 to be made smaller in the front-rear direction. In this case, for example, if the trigger type liquid ejector 1 is subjected to a drop impact or the like, the moment acting on the trigger type liquid ejector 1 from the connection part between the vertical supply tube part 20 and the storage pump part 25 can be reduced.

Second Embodiment
This embodiment differs from the first embodiment described above in that the axis O2 of the storage cylinder 51 is disposed so as to intersect with the front-rear direction.
In the trigger type liquid ejector 1 shown in FIG. 3, the storage cylinder 200 includes a cylinder main body 200a and a partition wall 200b.
The axis O2 of the cylinder body 200a extends upward toward the front. The front end of the cylinder body 200a is connected to the upper end of the vertical supply tube 20. In the inner space of the cylinder body 200a, a portion surrounded by the rear lip 84 and the front lip 93 constitutes a supply space 130a.

The partition wall 200b is formed in an annular shape that protrudes inward in the second radial direction from the front end opening edge of the cylinder body tube 200a. The inside of the partition wall 200b forms a communication port 200c that opens into the cylinder body tube 200a. The stopper portion 95 moves toward and away from the opening edge of the communication port 200c as the storage plunger 52 moves along the axis O2.

In this embodiment, a relay member 210 is provided between the nozzle member 11 and the storage pump section 25 (storage cylinder 200). The relay member 210 is formed in a cylindrical shape that extends linearly forward from the partition wall 200b. In other words, the axis O3 of the relay member 210 and the axis O2 of the storage cylinder 200 intersect with each other. The inside of the relay member 210 is connected to the inside of the storage cylinder 200 (storage space 130b) through the communication port 200c.

The relay member 210 is fitted into the nozzle axis 105 of the nozzle member 11. As a result, the storage cylinder 200 (inside the storage space 130b) is connected to the ejection hole 106a via the relay member 210. In the trigger type liquid ejector 1 of this embodiment, the axis O1 is offset rearward from the center of the trigger type liquid ejector 1 in the front-to-rear direction. In other words, the dimension from the axis O1 to the front end of the nozzle member 11 is shorter than the dimension from the axis O1 to the rear end of the cover 13.

In addition to providing the same effects as those of the first embodiment, the present embodiment provides the following effects.
That is, by providing the reservoir pump portion 25 in a direction intersecting the axis O2 in the front-rear direction, the trigger type liquid ejector 1 can be made smaller in the front-rear direction than when the axis O2 coincides with the front-rear direction. This improves the ease of handling.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments. Addition, omission, substitution, and other modifications of the configuration are possible without departing from the spirit of the present invention. The present invention is not limited by the above description, but is limited only by the scope of the attached claims.
Instead of the coil spring, the member that biases the trigger portion 30 and the main piston 32 forward may be, for example, a pair of resin springs provided on both sides of the storage pump portion 25 in the left-right direction and connected to the trigger portion 30. The trigger portion 30 may be slidable in the front-rear direction.
In the above embodiment, the configuration has been described in which the axis O2 of the storage pump portion 25 (storage cylinder) extends with a component in the front-rear direction, but the present invention is not limited to this configuration.

In the above embodiment, the valve member 54 is displaced along the axis O2, but the present invention is not limited to this configuration. The valve member 54 may be displaced in a direction intersecting the axis O2. The valve member 54 may also be a three-point valve, a ball valve, or the like.

In addition, the components in the above-described embodiments may be replaced with well-known components as appropriate without departing from the spirit of the present invention, and the above-described modifications may be combined as appropriate.

Reference Signs List 1: Trigger-type liquid ejector 10: Ejector body 11: Nozzle member 20: Vertical supply tube portion 24: Trigger mechanism 30: Trigger portion 51: Storage cylinder 52: Storage plunger 54: Valve member 95: Plug portion 105a: Opening 106a: Ejection hole 140: Communication passage 200: Storage cylinder A: Container body O2: Axis

Claims (2)

An ejector body that is attached to a container body that contains a liquid;
a nozzle member attached to a front end of the ejector body and having an ejection hole for ejecting liquid forward;
The ejector body includes:
A vertical supply tube portion extending in the vertical direction;
a trigger mechanism including a trigger portion provided in front of the vertical supply tube portion and movable rearward in a forward biased state, the trigger portion moving rearward to cause liquid to flow from inside the vertical supply tube portion toward the nozzle hole;
a storage cylinder provided above the vertical supply tube portion, into which liquid that has passed through the vertical supply tube portion flows as the trigger portion moves rearward;
a storage plunger provided in the storage cylinder and movable in one axial direction along an axis of the storage cylinder toward the other axial direction as liquid is supplied into the storage cylinder, while being biased toward the one axial direction along an axis of the storage cylinder;
The storage plunger has a communication passage formed therein that communicates with a first space that can communicate with the vertical supply tube portion and a second space that can communicate with the ejection hole, among the inner spaces of the storage cylinder;
a valve member that switches between communication and blocking between the first space and the second space is provided in the communication passage ,
The nozzle member has an opening that opens into the second space,
The storage plunger is a trigger-type liquid ejector that has a plug portion that moves toward and away from the opening edge of the opening as it moves axially within the storage cylinder, thereby switching between communication and blocking between the second space and the ejection hole through the opening . The trigger-type liquid ejector according to claim 1, wherein the valve member is movable in the axial direction.

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