WO2024116521A1

WO2024116521A1 - Discharge device

Info

Publication number: WO2024116521A1
Application number: PCT/JP2023/032133
Authority: WO
Inventors: 信也前田
Original assignee: 株式会社吉野工業所
Priority date: 2022-03-25
Filing date: 2023-09-01
Publication date: 2024-06-06
Also published as: JP2023143670A; JP2023143668A

Abstract

Provided is a discharge device (1) comprising: a first cylinder (24); a first piston (3) that slides on the first cylinder (24); a second cylinder (4) having a larger cross-sectional area than the first cylinder (24); a second piston (25) that slides on the second cylinder (4); a holding member (16) that is moved forward and backward together with the first piston (3), the first cylinder (24) and the second piston (25) with respect to the second cylinder (4) by external operation; an inner flow path (18) through which a fluid is discharged in accordance with the forward/backward movement of the holding member (16) via a pump chamber (18a) defined by the first cylinder (24), the first piston (3), the second cylinder (4), and the second piston (25); and a pressure accumulation part (17) that moves the first piston (3) from an open position at which the inner flow path (18) is opened to a closed position at which the inner flow path (18) is closed, using a biasing force in a direction resisting an increase in the inner pressure of the pump chamber (18a) associated with the forward movement of the holding member (16) with respect to the second cylinder (4). By the operation, the holding member (16) is moved forward together with the first piston (3) with respect to the second cylinder (4) to move the first piston (3) to the open position and thereafter moved forward together with the second piston (25).

Description

Discharger

The present invention relates to an ejector.

A dispenser is known that has a first cylinder, a first piston that slides on the first cylinder, a second cylinder with a larger cross-sectional area than the first cylinder, a second piston that slides on the second cylinder, a holding member that advances and retreats with the first piston, the first cylinder, and the second piston relative to the second cylinder by external operation, an internal flow path that discharges fluid through a pump chamber defined by the first cylinder, the first piston, the second cylinder, and the second piston in response to the advancement and retreat of the holding member, and a pressure accumulator that moves the first piston from an open position that opens the internal flow path to a closed position that closes the internal flow path by a biasing force in a direction against an increase in the internal pressure of the pump chamber due to the advancement of the holding member relative to the second cylinder, and that moves the first piston to the open position after the holding member advances with the first piston, the first cylinder, and the second piston relative to the second cylinder by operation (see, for example, Patent Document 1).

JP 2002-66398 A

　When attempting to design conventional pressure-accumulator dispensers like the one described above to obtain a large amount of discharge (spray), problems arose, such as the cylinder stroke becoming longer and the operation of the holding member becoming harder.

The object of the present invention is to provide a pressure accumulation type dispenser that can easily achieve a large discharge volume.

One aspect of the present invention is as follows:

[1]
A first cylinder;
a first piston sliding on the first cylinder;
A second cylinder having a cross-sectional area larger than that of the first cylinder;
a second piston sliding on the second cylinder;
a holding member that moves forward and backward with respect to the second cylinder together with the first piston, the first cylinder, and the second piston by an external operation;
an internal flow passage that discharges a fluid through a pump chamber defined by the first cylinder, the first piston, the second cylinder, and the second piston in response to the forward and backward movement of the holding member;
a pressure accumulator that moves the first piston from an open position that opens the internal flow path to a closed position that closes the internal flow path by a biasing force in a direction against an increase in the internal pressure of the pump chamber due to the advancement of the holding member relative to the second cylinder,
The ejector, wherein the holding member advances with the first piston relative to the second cylinder by the operation, and advances with the second piston after the first piston has been moved to the open position.

[2]
The dispenser according to [1], wherein the holding member advances relative to the first cylinder together with the first piston, and then advances relative to the second cylinder together with the second piston, by the operation.

[3]
The discharge device described in [2], wherein the first cylinder has a regulating step portion that moves the first piston from the closed position to the open position by abutting against the first piston when the holding member advances relative to the first cylinder together with the first piston through the operation.

[4]
The ejector according to claim 1, wherein the holding member advances relative to the second cylinder together with the first piston and the first cylinder by the operation, and after moving the first piston to the open position, the holding member advances relative to the second cylinder together with the second piston.

[5]
the retaining member has a cylindrical stem extending in the advancement/retraction direction, and a piston guide attached to an inner circumferential surface of the stem and having a seating portion,
The discharge device according to any one of [1] to [4], wherein the first piston has a seating portion that is spaced from the seating portion in the open position and that seats on the seating portion in the closed position.

[6]
The ejector according to any one of [1] to [5], wherein the ejection port of the internal flow path ejects the fluid in the form of a mist.

The present invention provides a pressure-accumulator type dispenser that can easily achieve a large discharge volume.

1 is a vertical cross-sectional view showing a discharge container having a discharger according to a first embodiment of the present invention in a state before operation. 2 is a vertical cross-sectional view showing a state when an operation of pushing down the discharge container shown in FIG. 1 onto a nozzle head is started. FIG. 3 is a vertical cross-sectional view showing a state in which the nozzle head is further pressed down from the state shown in FIG. 2 . FIG. 4 is a vertical cross-sectional view showing a state in which the nozzle head is further pressed down from the state shown in FIG. 3 . FIG. FIG. 11 is a vertical cross-sectional view showing a dispensing container having a dispenser according to a second embodiment of the present invention in a state before operation. 6 is a vertical cross-sectional view showing a state when an operation of pushing down the discharge container shown in FIG. 5 onto the nozzle head is started. FIG. 7 is a vertical cross-sectional view showing a state in which the nozzle head is further pressed down from the state shown in FIG. 6. 8 is a vertical cross-sectional view showing a state in which the nozzle head is further pressed down from the state shown in FIG. 7 . FIG. 11 is a vertical cross-sectional view showing a dispensing container having a dispenser according to a third embodiment of the present invention in a state before operation. 10 is a vertical cross-sectional view showing a state when an operation of pushing down the discharge container shown in FIG. 9 onto the nozzle head is started. FIG. 11 is a vertical cross-sectional view showing a state in which the nozzle head is further pressed down from the state shown in FIG. 10 . 12 is a vertical cross-sectional view showing a state in which the nozzle head is further pressed down from the state shown in FIG. 11 .

Below, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, in the first embodiment of the present invention, the dispenser 1 includes a first cylinder/second piston member 2, a first piston 3, a second cylinder 4, a stem member 5, a piston guide 6, a head body 7, a nozzle tip 8, a retaining member 9, an attachment cap 10, and a pipe 11, each of which is integrally formed of, for example, resin, and a valve body 12, a first biasing member 13, and a second biasing member 14, each of which is integrally formed of, for example, metal. The head body 7 and the nozzle tip 8 form a nozzle head 15, and the nozzle head 15, the stem member 5, and the piston guide 6 form a retaining member 16. The seating portion 3a of the first piston 3, the seated portion 6a of the piston guide 6, and the first biasing member 13 form a pressure accumulation portion 17. The valve body 12, the first biasing member 13, and the second biasing member 14 are not limited to being made of metal, but may be made of, for example, resin.

The discharger 1 has an internal flow path 18, which has a pump chamber 18a, an upstream flow path 18b, and a downstream flow path 18c, and the downstream flow path 18c has a discharge port 18d.

In this embodiment, the discharge container 19 has a dispenser 1, a container body 20, and a top lid 21.

The container body 20 has a cylindrical mouth 20a centered on the central axis O of the first cylinder 24 described below, a body 20b connected to the lower end of the mouth 20a, and a bottom connected to the lower end of the body 20b. Note that the mouth 20a may be configured to have a tubular shape other than a cylindrical shape, such as a square tube. The container body 20 contains liquid contents as a fluid to be discharged by the dispenser 1. Note that the contents may be any fluid and are not limited to liquid.

In this embodiment, the direction along the central axis O is also referred to as the forward/backward direction or the up/down direction, the direction from the mouth 20a toward the bottom along the forward/backward direction is also referred to as the forward direction or downward, and the opposite direction is also referred to as the backward direction or upward, the direction along a straight line perpendicular to the central axis O is also referred to as the radial direction, the direction going around the central axis O is also referred to as the circumferential direction, and a cross section including the central axis O is also referred to as a longitudinal cross section.

The second cylinder 4 has a larger cross-sectional area (i.e., the cross-sectional area of the inner circumferential surface) than the first cylinder 24. In other words, when the second cylinder 4 and the first cylinder 24 are cylindrical, the inner diameter of the second cylinder 4 is larger than the inner diameter of the first cylinder 24. The second cylinder 4 and the first cylinder 24 may each have a tubular configuration other than a cylindrical shape. The second cylinder 4 has an intake port 4a, and is held in the mouth portion 20a by attaching an attachment cap 10 to the mouth portion 20a. The second cylinder 4 also has a second cylinder body 4b that is tubular about the central axis O and in contact with the second piston 25, a flange 4c that extends radially outward from the upper part of the second cylinder body 4b and is disposed on the upper end surface of the mouth portion 20a via a packing 22, and a second cylinder bottom portion 4d that extends radially inward from the lower part of the second cylinder body 4b and has an intake port 4a.

The second cylinder bottom 4d has a bottom wall 4e that extends radially inward from the lower part of the second cylinder body 4b and forms an annular shape centered on the central axis O, a bottom tube part 4f that extends upward from the inner peripheral edge of the bottom wall 4e and forms a cylindrical shape centered on the central axis O, a valve seat part 4g that extends radially inward from the upper end of the bottom tube part 4f and has an intake port 4a on the central axis O, and seats the valve body 12, a valve restricting part 4h that extends upward from the outer peripheral edge of the valve seat part 4g and restricts the rise of the valve body 12 that is spaced upward from the valve seat part 4g, and a number of vertical ribs 4i that are arranged at intervals in the circumferential direction and each extend radially and vertically across the part of the upper surface of the bottom wall 4e excluding the outer peripheral edge and the outer peripheral surface of the bottom tube part 4f.

The upper end of the pipe 11 is attached to the inner surface of the bottom tube portion 4f by fitting.

The suction valve 23 is made up of the valve body 12, the valve seat 4g, and the valve restriction portion 4h. The suction valve 23 allows the movement of the contents from inside the container body 20 to the pump chamber 18a when the valve body 12 moves upward away from the valve seat 4g, while the valve body 12 seats downward on the valve seat 4g to prevent the movement of the contents in the opposite direction. Note that the suction valve 23 is not limited to a configuration having the valve body 12, the valve seat 4g, and the valve restriction portion 4h, and may be made up of an elastic valve such as a so-called three-point valve, for example.

The mounting cap 10 has a peripheral wall 10a attached to the outer circumferential surface of the mouth portion 20a, and a cap upper portion 10b that extends radially inward from the upper portion of the peripheral wall 10a and contacts the upper surface of the flange 4c, forming an annular shape centered on the central axis O. The cap upper portion 10b has a lower annular wall 10c that extends radially inward from the upper end of the peripheral wall 10a and contacts the upper surface of the flange 4c, an outer cylindrical wall 10d that extends upward from the inner peripheral edge of the lower annular wall 10c, an upper annular wall 10e that extends radially inward from the upper end of the outer cylindrical wall 10d, and an inner cylindrical wall 10f that extends upward and downward from the inner peripheral edge of the upper annular wall 10e.

The first cylinder/second piston member 2 forms an annular shape centered on the central axis O, with the upper end portion forming the first cylinder 24 and the lower end portion forming the second piston 25.

The second piston 25 has a second sliding cylinder 25a and a second cylindrical shaft 25b. The second sliding cylinder 25a constitutes the outer peripheral edge of the second piston 25 and slides vertically on the inner peripheral surface of the second cylinder body 4b. The second cylindrical shaft 25b constitutes the radial inner peripheral edge of the second piston 25 and has a cylindrical shape extending vertically, with the lower end of the second cylindrical shaft 25b integrally connected to the second sliding cylinder 25a and the upper end of the second cylindrical shaft 25b integrally connected to the lower end of the first cylinder 24.

The anti-slip member 9 is annular about the central axis O, is attached integrally to the second cylinder 4, and prevents the second piston 25 from slipping out upward from the second cylinder 4. More specifically, the anti-slip member 9 has an anti-slip portion 9a having an outer peripheral surface that contacts the inner peripheral surface of the second cylinder body 4b, and a protruding portion 9b that protrudes radially outward from the upper portion of the anti-slip portion 9a and has a lower surface that faces the upper surface of the second cylinder 4. The upper surface of the anti-slip portion 9a has a lower receiving portion 9c that is annularly concave about the central axis O and receives the lower end of the second biasing member 14.

The second piston 25 is prevented from coming out of the second cylinder 4 by the second piston 25 abutting upward against the retaining portion 9a. Downward displacement of the retaining member 9 relative to the second cylinder 4 is prevented by the protruding portion 9b abutting downward against the upper surface of the second cylinder 4. Upward displacement of the retaining member 9 relative to the second cylinder 4 is prevented by the portion of the retaining portion 9a that is outer circumferential than the lower receiving portion 9c abutting upward against the lower end surface of the inner cylindrical wall 10f of the mounting cap 10.

The second biasing member 14 is arranged around the central axis O and is composed of a compression spring that expands and contracts in the vertical direction.

The first cylinder 24 is annular about the central axis O and has a first cylinder body 24a and a restricting step 24b. The first cylinder body 24a is cylindrical about the central axis O and contacts the first piston 3. The restricting step 24b protrudes radially inward from the lower end of the first cylinder body 24a in a stepped shape.

The holding member 16 moves forward and backward (in forward and backward directions) with the first piston 3, the first cylinder 24, and the second piston 25 relative to the second cylinder 4 when pressed down from the outside via the nozzle head 15.

The retaining member 16 also has a cylindrical stem 5a that extends in the forward and backward directions around the central axis O, a piston guide 6 that is attached to the inner peripheral surface of the stem 5a and has a seating portion 6a, and a connecting portion 5b that is integrally connected to the stem 5a and radially outward from the stem 5a, and is biased in the backward direction by a second biasing member 14. The stem member 5 is also composed of the stem 5a and the connecting portion 5b.

The piston guide 6 is rod-shaped and extends in the forward and backward directions around the central axis O. The piston guide 6 also has an enlarged diameter portion 6b that enlarges below the stem 5a, and the enlarged diameter portion 6b has a seating portion 6a.

The first piston 3 is annular about the central axis O, and has a first sliding cylinder 3b and a first cylindrical shaft 3c. The first sliding cylinder 3b constitutes the outer peripheral edge of the first piston 3, and slides in the forward and backward direction on the inner peripheral surface of the first cylinder body 24a. The first cylindrical shaft 3c constitutes the radial inner peripheral edge of the first piston 3, and is cylindrical extending in the forward and backward direction, with the lower end of the first cylindrical shaft 3c integrally connected to the first sliding cylinder 3b. The first cylindrical shaft 3c surrounds the outer peripheral surface of the piston guide 6, and advances and retreats relative to the piston guide 6. The first cylindrical shaft 3c also slides in the forward and backward direction on the lower end of the outer peripheral surface of the stem 5a.

The first piston 3 has a seating portion 3a that seats on the seating portion 6a in the forward direction and moves away from the seating portion 6a in the backward direction in response to the forward and backward movement of the retaining member 16.

The connecting portion 5b of the retaining member 16 has a cylindrical engagement wall 5c that extends in the forward and backward directions around the central axis O radially outward from the stem 5a, a connecting wall 5d that connects the upper end of the engagement wall 5c to the outer peripheral surface of the stem 5a, and an upper receiving portion 5e that protrudes radially outward in a stepped shape from the upper end of the outer peripheral surface of the engagement wall 5c and receives the upper end of the second biasing member 14.

The second biasing member 14 biases the first cylinder 24 in the backward direction via an engagement portion 26 between the uneven portions of the inner peripheral surface of the engagement wall 5c of the connecting portion 5b and the outer peripheral surface of the first cylinder 24. A first gap G1 of a predetermined size is set between the lower surface of the connecting wall 5d of the connecting portion 5b and the upper end surface of the first cylinder 24.

The first biasing member 13 is composed of a compression spring that is compressed by the connecting wall 5d of the connecting portion 5b and the first piston 3 in the forward and backward direction.

The head body 7 is attached to the upper end of the stem 5a. The nozzle tip 8 is attached in a fitting groove provided on the side of the head body 7, forming a flow path between the head body 7 and the nozzle tip 8 for discharging (i.e. spraying) the contents in a mist form from the discharge port 18d. The top surface of the head body 7 forms the operated part 15a that receives a push-down operation from the outside. The nozzle head 15 advances and retreats together with the holding member 16 relative to the second cylinder 4 and the container body 20 in response to the push-down operation.

The internal flow path 18 has a pump chamber 18a, an upstream flow path 18b upstream of the pump chamber 18a, and a downstream flow path 18c downstream of the pump chamber 18a. The pump chamber 18a is defined by the first cylinder 24, the first piston 3, the second cylinder 4, and the second piston 25. The upstream flow path 18b is defined by the pipe 11. The downstream flow path 18c is defined by the first piston 3, the stem 5a, the piston guide 6, and the nozzle head 15. The discharge port 18d is provided in the nozzle tip 8, and is located at the most downstream part of the downstream flow path 18c.

The pressure accumulator 17 moves the first piston 3 from an open position that opens the internal flow passage 18 to a closed position that closes the internal flow passage 18 by the biasing force of the first biasing member 13 in a direction (i.e. downward) that resists the increase in the internal pressure of the pump chamber 18a caused by the advancement of the retaining member 16 relative to the second cylinder 4. The seating portion 3a of the first piston 3 is separated from the seated portion 6a of the retaining member 16 in the open position, and seats on the seated portion 6a of the retaining member 16 in the closed position that is lower than the open position.

The first vertical gap G1 between the lower surface of the connecting wall 5d of the connecting portion 5b and the upper end surface of the first cylinder 24, the second vertical gap G2 between the lower end of the stem 5a and the first piston 3, the third vertical gap G3 between the lower end of the first sliding tube 3b of the first piston 3 and the upper surface of the regulating step portion 24b, and the biasing force of the first biasing member 13 are set so that the holding member 16 advances with the first piston 3 relative to the second cylinder 4 when pressed down, and advances with the second piston 25 after the first piston 3 has been moved to the open position; more specifically, the holding member 16 advances with the first piston 3 relative to the first cylinder 24 and then advances with the second piston 25 relative to the second cylinder 4 when pressed down.

The top lid 21 opens and closes the dispenser 1. When the top lid 21 closes the dispenser 1, the top lid 21 has a cylindrical outer wall 21a centered on the central axis O, and a top wall 21b connected to the upper end of the outer wall 21a. The lower end of the outer wall 21a is removably attached to the outer peripheral surface of the outer cylindrical wall 10d of the attachment cap 10.

The dispenser 1 of this embodiment is configured as described above, so it operates as follows when pressed down.

As shown in FIG. 2, when the holding member 16 moves forward relative to the second cylinder 4 by pushing down against the biasing force of the second biasing member 14, first, the pressure accumulator 17 closes the downstream flow path 18c due to the biasing force from the first biasing member 13, and the holding member 16 moves forward relative to the first cylinder 24 together with the first piston 3, increasing the internal pressure of the pump chamber 18a.

As shown in FIG. 3, when the first piston 3 moves from the closed position to the open position due to the increased internal pressure of the pump chamber 18a, that is, when the seating portion 3a moves upward from the seated portion 6a against the biasing force from the first biasing member 13, the contents in the pump chamber 18a that have accumulated pressure flow downstream between the seating portion 3a and the seated portion 6a and are forcefully discharged (sprayed) from the discharge port 18d. Therefore, forceful discharge is realized from the initial stage of the pushing down operation, and as a result, dripping from the discharge port 18d can be suppressed. In this way, by configuring the first piston 3 to advance against the first cylinder 24, which has a smaller cross-sectional area than the second cylinder 4, before the second piston 25 advances against the second cylinder 4, the operating force required at the beginning of the pushing down operation can be reduced, making it possible to spray with light operation.

Further pressing down operation advances the holding member 16 relative to the first cylinder 24 to the forward limit position where the connecting portion 5b abuts against the upper end of the first cylinder 24, and as shown in FIG. 4, the connecting portion 5b presses the first cylinder 24 in the forward direction, so that the holding member 16 advances relative to the second cylinder 4 together with the first cylinder 24 and the second piston 25, and as a result, the contents in the pump chamber 18a flow downstream through between the seating portion 3a and the seated portion 6a and are forcefully discharged (sprayed) from the discharge port 18d. Therefore, even after the initial stage of the pressing down operation, forceful discharge is realized, and as a result, dripping from the discharge port 18d can be suppressed. At this time, the first piston 3 abuts against the regulating step portion 24b in the forward direction, so that the seating portion 3a is maintained in a state separated from the seated portion 6a in the backward direction, and as a result, the pressing down operation is suppressed from becoming heavy.

When the retaining member 16, together with the second piston 25, reaches its forward limit position relative to the second cylinder 4, the lower end of the second cylinder shaft 25b abuts against the upper surfaces of the multiple vertical ribs 4i, restricting further forward movement.

When the pushing operation is released, first the force of the second biasing member 14 causes the holding member 16 to retreat relative to the first cylinder 24, then the force of the first biasing member 13 causes the seating portion 3a to seat on the seated portion 6a, blocking the downstream flow path 18c, and then while in this seated state, the force of the second biasing member 14 causes the holding member 16, the first piston 3, and the first cylinder/second piston member 2 to retreat relative to the second cylinder 4 to their positions before the pushing operation. Also, due to this retreating action, the internal pressure of the pump chamber 18a decreases, opening the suction valve 23, and the contents flow from inside the container body 20 into the pump chamber 18a through the upstream flow path 18b.

According to this embodiment, in the initial stage of the pressing operation, a small amount of contents can be stored in the pressure accumulator 17 by the first cylinder 24, which has a smaller cross-sectional area than the second cylinder 4, and the first piston 3, and can be forcefully discharged, and after the initial stage of the pressing operation, a large amount of contents can be forcefully discharged by the second cylinder 4 and the second piston 25, and the operating force can also be reduced. Therefore, according to this embodiment, it is possible to easily achieve a large amount of discharge (spray) while preventing the cylinder stroke from becoming longer and preventing the pressing operation from becoming heavier.

The discharger 1 is not limited to a configuration in which the first piston 3 moves from the closed position to the open position due to the increased internal pressure of the pump chamber 18a as in this embodiment, but may be configured, for example, as in the second embodiment shown in Figures 5 to 8, in which the restricting step 24b moves the first piston 3 from the closed position to the open position by abutting against the first piston 3 as a result of the holding member 16 moving forward with the first piston 3 toward the first cylinder 24 by a pushing down operation.

With this configuration, the timing for moving the first piston 3 from the closed position to the open position can be determined by the downward stroke rather than the internal pressure of the pump chamber 18a.

Furthermore, the dispenser 1 is not limited to a configuration in which the holding member 16 advances toward the first cylinder 24 together with the first piston 3 and then advances toward the second cylinder 4 together with the second piston 25 when pressed down as in this embodiment (i.e., a configuration in which there is a first gap G1). For example, as in the third embodiment shown in Figures 9 to 12, the holding member 16 may advance toward the second cylinder 4 together with the first piston 3 and the first cylinder 24 when pressed down, and after the first piston 3 is moved to the open position, it may advance toward the second cylinder 4 together with the second piston 25.

Even with this configuration, the same effect as in the first embodiment can be obtained by pushing down the first piston 3 to move it from the closed position to the open position, spraying the contents at high pressure, and then operating the second piston 25.

In the third embodiment, the portion connecting the lower end of the first cylinder 24 and the second sliding cylinder 25a of the second piston 25 is configured as an annular elastic portion 25c, and the annular elastic portion 25c can be elastically deformed to allow the first cylinder 24 to move downward relative to the second piston 25. When the pushing-down operation is released, the annular elastic portion 25c can transmit the upward pulling force from the lower end of the first cylinder 24 to the second sliding cylinder 25a of the second piston 25. The second sliding cylinder 25a of the second piston 25 and the annular elastic portion 25c are formed of an elastic material such as rubber or elastomer, and are integrally formed by insert molding or the like at the lower end of the first cylinder 24 made of resin. An outer cylinder 27a of the support member 27 is arranged inside the second sliding cylinder 25a, and the elastic deformation of the second sliding cylinder 25a in the radially inward direction is regulated by the outer cylinder 27a of the support member 27. The support member 27 has an inner cylinder 27b, an outer cylinder 27a, and a connecting portion 27c that connects the inner cylinder 27b and the outer cylinder 27a. The connecting portion 27c is composed of multiple connecting pieces arranged in the circumferential direction. The inner cylinder 27b is arranged slidably relative to the lower end of the inner circumferential surface of the first cylinder 24.

The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the invention.

Therefore, the dispenser 1 of the above-mentioned embodiment comprises a first cylinder 24, a first piston 3 sliding on the first cylinder 24, a second cylinder 4 having a larger cross-sectional area than the first cylinder 24, a second piston 25 sliding on the second cylinder 4, a retaining member 16 that advances and retreats with the first piston 3, the first cylinder 24, and the second piston 25 relative to the second cylinder 4 by external operation, and a pump chamber 18a that is partitioned by the first cylinder 24, the first piston 3, the second cylinder 4, and the second piston 25, and a retaining member 16 that retains the fluid through the pump chamber 18a. The dispenser 1 has an internal flow path 18 that discharges in response to the forward and backward movement of the holding member 16, and a pressure accumulator 17 that moves the first piston 3 from an open position that opens the internal flow path 18 to a closed position that closes the internal flow path 18 by a biasing force in a direction that resists the increase in the internal pressure of the pump chamber 18a due to the forward movement of the holding member 16 relative to the second cylinder 4, and the holding member 16 can be modified as long as it is a dispenser 1 in which the holding member 16 advances with the first piston 3 relative to the second cylinder 4 when operated, and advances with the second piston 25 after the first piston 3 has been moved to the open position.

For example, the dispenser 1 is not limited to a configuration in which the discharge port 18d dispenses the contents in a mist form. The dispenser 1 is also not limited to a configuration in which the second biasing member 14 biases the first cylinder 24 in the backward direction via the engagement portion 26 between the connecting portion 5b and the first cylinder 24. The dispenser 1 is also not limited to a configuration in which the connecting portion 5b presses the first cylinder 24 in the forward direction at the forward limit position relative to the first cylinder 24, and may be configured, for example, so that the lower end of the stem 5a presses the first cylinder 24 in the forward direction via the first piston 3 in the open position and the regulating step portion 24b. The first cylinder 24 is not limited to a configuration having the regulating step portion 24b. The second cylinder bottom portion 4d is not limited to a configuration having a plurality of vertical ribs 4i. The second cylinder bottom 4d is not limited to a configuration having a bottom tubular portion 4f, and may be configured to have a bottom wall 4e, a valve seat portion 4b located below the bottom wall 4e, and a connecting wall 4j connecting the bottom wall 4e and the valve seat portion 4b, as shown in Fig. 5, etc. The cap upper portion 10b of the mounting cap 10 is not limited to a configuration having a lower annular wall 10c, an outer tubular wall 10d, an upper annular wall 10e, and an inner tubular wall 10f, and may be configured to have a pressing portion 10g facing the upper surface of the flange 4c and the upper surface of the retaining member 9, and a peripheral wall portion 10h projecting upward from the pressing portion 10g radially outside the nozzle head 15, as shown in Fig. 5, etc. The pressure accumulator 17 is not limited to a configuration having a seated portion 6a of the piston guide 6 and a seated portion 3a of the first piston 3. The second biasing member 14 may be configured to bias the holding member 16 in the retracting direction via a portion other than the connecting portion 5b, and may be configured, for example, to be disposed between the upper surface of the mounting cap 10 and the lower surface of the nozzle head 15 to bias the nozzle head 15 upward.

REFERENCE SIGNS LIST 1 Discharger 2 First cylinder/second piston member 3 First piston 3a Seat portion 3b First sliding cylinder 3c First cylinder shaft 4 Second cylinder 4a Suction port 4b Second cylinder body 4c Flange 4d Second cylinder bottom 4e Bottom wall 4f Bottom cylinder portion 4g Valve seat portion 4h Valve restricting portion 4i Vertical rib 4j Connecting wall 5 Stem member 5a Stem 5b Connecting portion 5c Engagement wall 5d Connecting wall 5e Upper receiving portion 6 Piston guide 6a Seat portion 6b Enlarged diameter portion 7 Head body 8 Nozzle tip 9 Anti-slip member 9a Anti-slip portion 9b Protruding portion 9c Lower receiving portion 10 Mounting cap 10a Circumferential wall 10b Cap upper portion 10c Lower annular wall 10d Outer cylinder wall 10e Upper annular wall 10f Inner cylinder wall 10g, pressing portion 10h, peripheral wall portion 11, pipe 12, valve body 13, first biasing member 14, second biasing member 15, nozzle head 15a, operated portion 16, holding member 17, pressure accumulating portion 18, internal flow path 18a, pump chamber 18b, upstream flow path 18c, downstream flow path 18d, discharge port 19, discharge container 20, container body 20a, mouth portion 20b, trunk portion 21, upper lid 21a, outer peripheral wall 21b, top wall 22, packing 23, suction valve 24, first cylinder 24a, first cylinder body 24b, restricting step portion 25, second piston 25a, second sliding cylinder 25b, second cylinder shaft 25c, annular elastic portion 26, engaging portion 27, support member 27a, outer cylinder 27b, inner cylinder 27c, connecting portion G1, first gap G2, second gap G3, third gap O, central axis

Claims

A first cylinder;
a first piston sliding on the first cylinder;
A second cylinder having a cross-sectional area larger than that of the first cylinder;
a second piston sliding on the second cylinder;
a holding member that moves forward and backward with respect to the second cylinder together with the first piston, the first cylinder, and the second piston by an external operation;
an internal flow passage that discharges a fluid through a pump chamber defined by the first cylinder, the first piston, the second cylinder, and the second piston in response to the forward and backward movement of the holding member;
a pressure accumulator that moves the first piston from an open position that opens the internal flow path to a closed position that closes the internal flow path by a biasing force in a direction against an increase in the internal pressure of the pump chamber due to the advancement of the holding member relative to the second cylinder,
The ejector, wherein the holding member advances with the first piston relative to the second cylinder by the operation, and advances with the second piston after the first piston has been moved to the open position.
The dispenser according to claim 1, wherein the holding member advances with the first piston relative to the first cylinder and then advances with the second piston relative to the second cylinder by the operation.
The dispenser according to claim 2, wherein the first cylinder has a restricting step that moves the first piston from the closed position to the open position by abutting against the first piston when the holding member advances with the first piston relative to the first cylinder by the operation.
The dispenser according to claim 1, wherein the holding member advances relative to the second cylinder together with the first piston and the first cylinder by the operation, and advances relative to the second cylinder together with the second piston after the first piston has been moved to the open position.
the retaining member has a cylindrical stem extending in the advancement/retraction direction, and a piston guide attached to an inner circumferential surface of the stem and having a seating portion,
2. The dispenser of claim 1, wherein the first piston has a seat spaced from the seat in the open position and seated against the seat in the closed position.
The dispenser according to any one of claims 1 to 5, wherein the discharge port of the internal flow path discharges the fluid in a mist form.