Ejector

Abstract

To provide a discharge tool capable of preventing leakage of a content due to inner pressure increase.SOLUTION: A discharge tool 4 comprises a first cylinder part 20 whose inside is connected to an inside of a container body 2, a second cylinder part 30 disposed above the first cylinder part 20, and a cylindrical movable part 50 opened downward. The movable part 50 comprises a first piston part 62 arranged inside the first cylinder part 20 so as to be freely slidable in an upward-downward direction, a second piston part 72 arranged inside the second cylinder part so as to be freely slidable in an upward-downward direction, and a communicating flow passage part 51 through which the inside of the first cylinder part 20 is connected with the inside of the second cylinder part 30. The first cylinder part 20 is provided with a check valve part 25 for regulating a content flow into the container body 2 from the inside of the first cylinder part 20. The discharge tool 4 further comprises a seal part 90 for sealing communication between the inside of the first cylinder part 20 and the inside of the second cylinder part 30 in an openable manner in accordance with downward movement of the movable part 50.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a dispenser. [Background technology]

[0002] A known pressure-accumulation type dispenser includes a first cylinder portion whose interior is connected to the interior of the container body, a second cylinder portion that is arranged above the first cylinder portion and is movable downwards when in an upwardly biased state, and is arranged vertically between the first and second cylinder portions and is movable downwards when in an upwardly biased state, and has a communicating flow path portion that connects the interior of the first cylinder portion with the interior of the second cylinder portion, and also includes a cylindrical movable portion that opens downwards, and a head portion that has a discharge hole that connects to the interior of the second cylinder portion, and the contents are dispensed from the discharge hole by moving the head portion downward (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 60-32505 Summary of the Invention [Problem to be solved by the invention]

[0004] In the dispenser as described above, when the internal pressure of the first cylinder portion increases, there is a possibility that the contents may leak from the discharge hole of the head portion through the communicating flow path portion.

[0005] The present invention has been made in consideration of the above circumstances, and aims to provide a dispenser that can prevent leakage of contents due to an increase in internal pressure. [Means for solving the problem]

[0006] The dispenser of the present invention is a dispenser that is attached to the mouth of a container body that contains contents, and includes a first cylinder portion whose interior is connected to the interior of the container body, a second cylinder portion that is arranged above the first cylinder portion and is movable downward in an upwardly biased state, a cylindrical movable portion that is arranged between the first cylinder portion and the second cylinder portion in the vertical direction and is movable downward in an upwardly biased state and opens downward, and a head portion that has a discharge hole that is connected to the interior of the second cylinder portion, and the movable portion includes a first piston portion that is arranged inside the first cylinder portion so as to be slidable in the vertical direction, and a head portion that is arranged inside the second cylinder portion. The container has a second piston portion arranged to slide freely in the vertical direction, a communicating flow path portion connecting the inside of the first cylinder portion with the inside of the second cylinder portion, and a pressure accumulator valve portion that can open and close between the inside of the second cylinder portion and the discharge hole, and the first cylinder portion is provided with a check valve portion that allows the flow of the contents from the inside of the container body to the inside of the first cylinder portion and regulates the flow of the contents from the inside of the first cylinder portion to the inside of the container body, and further includes a seal portion that releasably blocks the communication between the inside of the first cylinder portion and the inside of the second cylinder portion as the movable portion moves downward.

[0007] According to the present invention, when the head portion is not pressed down, the seal portion blocks communication between the interior of the first cylinder portion and the interior of the second cylinder portion, so even if the internal pressure of the first cylinder portion increases unintentionally, the internal pressure of the second cylinder portion can be prevented from increasing through the communicating flow path portion, thereby preventing the contents inside the second cylinder portion from leaking out of the discharge hole.

[0008] In the above-described dispenser, the check valve portion may be formed with a minute gap that releases pressure within the first cylinder portion when the pressure within the first cylinder portion increases before the seal portion is opened.

[0009] According to the present invention, the internal pressure of the first cylinder portion can be released into the container body. Therefore, when the head portion is pressed down, the pressure in the space between the seal portion and the check valve portion is prevented from increasing excessively until the flow of the contents is permitted through the seal portion. Therefore, the force required to press down the head portion can be prevented from increasing.

[0010] The above-described discharger may further include a columnar portion inserted into the interior of the movable portion from below, wherein the pressure accumulator valve portion is provided with a communication hole portion that communicates the interior of the movable portion with the discharge hole, the movable portion is provided with an annular sealing protrusion portion that protrudes radially inward from the inner peripheral surface of the movable portion and contacts the outer peripheral surface of the columnar portion, and the outer peripheral surface of the columnar portion is provided with a recess that is recessed radially inward and located below the sealing protrusion portion, the movable portion is movable to a position where the sealing protrusion portion and the recess portion are radially opposed, and when the sealing protrusion portion is radially opposed to the recess portion, a portion of the interior of the first cylinder portion that is located below the first piston portion is in communication with the discharge hole via a gap between the inner peripheral surface of the movable portion and the outer peripheral surface of the columnar portion and the communication hole portion.

[0011] According to the present invention, when the seal projection faces the seal recess in the radial direction, the pressure inside the first cylinder can be released through the discharge hole to the outside of the dispenser. As a result, at least a portion of the contents remaining in a pressurized state in the portion of the first cylinder below the first piston is discharged through the discharge hole to the outside of the dispenser via the gap between the inner circumferential surface of the movable portion and the outer circumferential surface of the columnar portion and the communicating hole. Therefore, a portion of the contents sucked into the first cylinder from the container body is not returned to the container body. In other words, the contents that flow into the first cylinder can be prevented from returning to the container body. Furthermore, since the contents discharged from the first cylinder can be discharged through the discharge hole as the pressure inside the first cylinder is released, the amount of contents discharged through the discharge hole can be prevented from changing even if the rate at which the pressure inside the first cylinder changes depending on the speed at which the head is pressed down. This results in a dispenser with a structure that can stabilize the amount of contents discharged. In addition, since the portion of the contents sucked from the container body into the first cylinder portion is not returned to the container body, a decrease in the amount of contents discharged from the discharge hole, i.e., the amount of contents discharged, can be suppressed. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a dispenser that can suppress leakage of contents due to an increase in internal pressure. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 2 is a cross-sectional view showing the dispenser of the first embodiment, illustrating the dispenser in a state where the head portion is not pressed down. [Figure 2] FIG. 2 is a cross-sectional view showing the dispenser of the first embodiment, illustrating the dispenser in a state where the head portion is being pressed down. [Figure 3] FIG. 10 is a cross-sectional view showing a dispenser of a second embodiment, illustrating the dispenser in a state where the head portion is not pressed down. [Figure 4]FIG. 10 is a cross-sectional view showing a dispenser of a third embodiment, illustrating the dispenser in a state where the head portion is not pressed down. [Figure 5] FIG. 10 is a cross-sectional view showing a dispenser of a fourth embodiment, illustrating the dispenser in a state where the head portion is not pressed down. [Figure 6] FIG. 10 is a cross-sectional view showing a dispenser of a fifth embodiment, illustrating the dispenser in a state where the head portion is not pressed down. DETAILED DESCRIPTION OF THE INVENTION

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a dispenser according to the present invention will be described with reference to the drawings.

[0015] [First embodiment] As shown in Fig. 1, the dispenser 4 of the first embodiment is attached to the mouth 3 of a cylindrical container body 2 with a bottom that contains the contents. By attaching the dispenser 4 to the mouth 3, a dispensing container 1 is formed that includes the container body 2 and the dispenser 4. The contents may be liquids such as medicines, cosmetics, fragrances, etc.

[0016] Here, the mouth 3 and the dispenser 4 are formed into a cylindrical shape and arranged coaxially on a common axis. Hereinafter, the common axis will be referred to as the container axis O, and the direction along the container axis O will be referred to as the up-down direction. Within the up-down direction, the direction from the bottom of the container body 2 toward the mouth 3 will be referred to as the up direction, and the opposite direction will be referred to as the down direction. Furthermore, in a plan view seen from the up-down direction, the direction intersecting the container axis O will be referred to as the radial direction, and the direction going around the container axis O will be referred to as the circumferential direction.

[0017] The dispenser 4 includes a mounting tubular portion 10, a first cylinder portion 20, a columnar portion 80, a second cylinder portion 30, a head portion 40, a movable portion 50, and a seal portion 90. The mounting tube part 10 is mounted to the opening part 3 of the container body 2. The mounting tube part 10 has an annular plate part 11, a mounting tube part main body 12, a guide tube part 13, and an outer tube part 14. The annular plate portion 11 is in the shape of an annular plate and is arranged coaxially with the axis O of the container.

[0018] The mounting tube body 12 extends downward from the radial outer edge of the annular plate portion 11. The mounting tube body 12 is cylindrical and arranged coaxially with the container axis O. The mounting tube body 12 opens downward. A female thread is formed on the inner peripheral surface of the mounting tube body 12. The female thread of the mounting tube body 12 is screwed into a male thread formed on the mouth portion 3 of the container body 2. In this way, the mounting tube 10 is mounted to the mouth portion 3, and the dispenser 4 is fixed to the container body 2.

[0019] The guide tube portion 13 protrudes upward from the radial inner edge of the annular plate portion 11. The guide tube portion 13 is cylindrical and arranged coaxially with the container axis O. The guide tube portion 13 opens upward. An engagement protrusion that protrudes radially inward is formed on the inner circumferential surface at the upper end of the guide tube portion 13.

[0020] The outer tube portion 14 protrudes upward from the annular plate portion 11. The outer tube portion 14 is arranged radially outside the guide tube portion 13 with a gap therebetween. The outer tube portion 14 is located radially inside the mounting tube portion main body 12. The outer tube portion 14 is cylindrical and arranged coaxially with the container axis O. The outer tube portion 14 opens upward. The upper end of the outer tube portion 14 is located slightly above the upper end of the guide tube portion 13.

[0021] The first cylinder portion 20 has a cylindrical shape that extends in the vertical direction. The first cylinder portion 20 is arranged coaxially with the container axis O. The first cylinder portion 20 is open on both sides in the vertical direction. The first cylinder portion 20 protrudes downward from the inside of the mounting tube portion 10. The first cylinder portion 20 is inserted into the inside of the container body 2. The outer diameter of the first cylinder portion 20 is smaller than the inner diameter of the annular plate portion 11. The upper end of the suction tube 24 is fitted into the lower end of the first cylinder portion 20. The inside of the first cylinder portion 20 is in communication with the inside of the container body 2 via the suction tube 24.

[0022] The first cylinder 20 includes a cylindrical peripheral wall 21 and a cylinder flange 22 that extends radially outward from the upper end of the peripheral wall 21. The cylinder flange 22 is fitted into the interior of the upper end of the mounting tube main body 12. As a result, the first cylinder 20 is attached to the mounting tube 10 via the cylinder flange 22. The upper surface of the cylinder flange 22 is in contact with the lower surface of the annular plate 11. The lower surface of the cylinder flange 22 is in contact with the upper end of the mouth 3 of the container main body 2 via the seal member 5.

[0023] The first cylinder portion 20 is provided with a check valve portion 25. In this embodiment, the check valve portion 25 is provided near the lower end of the first cylinder portion 20. The check valve portion 25 is formed by a valve seat portion 26 provided in the middle portion of the peripheral wall portion 21 in the up-down direction, and a ball valve 27 seated on the valve seat portion 26 from above. The valve seat portion 26 may be located between the upper end and the lower end of the peripheral wall portion 21.

[0024] The valve seat 26 is formed into a tapered cylindrical shape whose inner circumferential surface narrows downward. The ball valve 27 is disposed above the inner circumferential surface of the valve seat 26. The ball valve 27 is movable toward and away from the valve seat 26. The check valve 25 forms a sealing surface by the intimate contact between the inner circumferential surface of the valve seat 26 and the outer surface of the ball valve 27. The check valve 25 regulates communication between the interior of the first cylinder 20 and the interior of the container body 2 when the ball valve 27 is seated on the valve seat 26. The check valve 25 communicates between the interior of the first cylinder 20 and the interior of the container body 2 when the ball valve 27 moves away from the valve seat 26. In other words, the check valve 25 allows the flow of contents from the interior of the container body 2 to the interior of the first cylinder 20, while blocking the flow of contents from the interior of the first cylinder 20 to the interior of the container body 2.

[0025] A minute gap 28 is formed in the check valve portion 25. The minute gap 28 connects the interior of the first cylinder portion 20 with the interior of the container body 2. In this embodiment, the minute gap 28 is formed by roughening the inner circumferential surface of the valve seat portion 26. The minute gap 28 allows the internal pressure of the first cylinder portion 20 to escape into the container body 2. The outer surface of the ball valve 27 may be roughened, or both the inner circumferential surface of the valve seat portion 26 and the outer surface of the ball valve 27 may be roughened. Instead of roughening, the minute gap 28 may be formed by a minute groove or the like.

[0026] The first cylinder portion 20 is provided with an outside air introduction hole 23 that radially penetrates the peripheral wall portion 21 of the first cylinder portion 20. The outside air introduction hole 23 is located above the valve seat portion 26. The outside air introduction hole 23 opens into the interior of the mouth portion 3 of the container body 2. The outside air introduction hole 23 is located above the first piston portion 62, which will be described later.

[0027] The second cylinder portion 30 is disposed above the first cylinder portion 20 and is movable downward while being biased upward. The second cylinder portion 30 is cylindrical with a top that opens downward. The second cylinder portion 30 is disposed coaxially with the container axis O. The second cylinder portion 30 has a top wall 31 and a peripheral wall 32. The top wall 31 is disk-shaped and disposed coaxially with the container axis O. A through-hole 33 is formed in the center of the top wall 31, penetrating the top wall 31 in the vertical direction.

[0028] The peripheral wall 32 extends downward from the radial outer edge of the top wall 31. The peripheral wall 32 is cylindrical and opens downward. The inner diameter of the peripheral wall 32 is larger than the inner diameter of the peripheral wall portion 21 of the first cylinder portion 20. The peripheral wall 32 is fitted into the radial inside of the guide tube portion 13. The peripheral wall 32 is slidable in the up and down direction relative to the guide tube portion 13. An engaging protrusion that protrudes radially outward is formed on the outer peripheral surface of the lower end portion of the peripheral wall 32. The engaging protrusion of the peripheral wall 32 engages with the engaging protrusion of the guide tube portion 13 from below.

[0029] The second cylinder portion 30 further includes an inner cylinder portion 34 and an outer cylinder portion 35 that protrude upward from the upper surface of the top wall 31. The inner cylinder portion 34 and the outer cylinder portion 35 are cylindrical and open upward. The inner cylinder portion 34 and the outer cylinder portion 35 are arranged coaxially with the container axis O. The outer cylinder portion 35 is located radially outward of the inner cylinder portion 34. The inner cylinder portion 34 protrudes upward from the periphery of the through hole 33 in the top wall 31. The interior of the inner cylinder portion 34 is connected to the interior of the peripheral wall 32 via the through hole 33. The outer cylinder portion 35 protrudes upward from the outer periphery of the top wall 31.

[0030] The head portion 40 is attached to the second cylinder portion 30. The head portion 40 is disposed coaxially with the container axis O and is a generally cylindrical shape with a top that opens downward. The head portion 40 is movable downward together with the second cylinder portion 30 while being biased upward. The head portion 40 has a head top wall portion 41, a head outer cylinder portion 42 that extends downward from the radial outer edge of the head top wall portion 41, and a head inner cylinder portion 43 that is located radially inside the head outer cylinder portion 42 and extends downward from the head top wall portion 41.

[0031] The head outer cylinder portion 42 is located radially outside the second cylinder portion 30. The lower end of the head outer cylinder portion 42 is located higher than the lower end of the second cylinder portion 30. The lower end of the head outer cylinder portion 42 is inserted between the guide cylinder portion 13 and the outer cylinder portion 14 of the mounting cylinder portion 10.

[0032] The head inner cylinder portion 43 is fitted onto the inner cylinder portion 34 provided in the second cylinder portion 30. As a result, the head portion 40 is attached to the second cylinder portion 30 via the inner cylinder portion 34. The lower end of the head inner cylinder portion 43 is in contact with the upper surface of the top wall 31 of the second cylinder portion 30. The lower end of the head inner cylinder portion 43 is inserted radially between the inner cylinder portion 34 and the outer cylinder portion 35 provided in the second cylinder portion 30.

[0033] The head portion 40 has a nozzle portion 44. The nozzle portion 44 has a nozzle through-hole 45, a nozzle tip 46, and a nozzle shaft portion 47. The nozzle through-hole 45 is a hole that extends radially from the outer peripheral surface of the head outer cylindrical portion 42 to the inner peripheral surface of the head inner cylindrical portion 43 . The nozzle tip 46 is fitted into and fixed to the nozzle through-hole 45 from the radially outer side. The nozzle tip 46 is a cylindrical member that opens radially inward and has a lid portion on the radially outer side. A discharge hole 48 that passes radially through the lid portion of the nozzle tip 46 is formed in the center of the lid portion. The discharge hole 48 is connected to the interior of the second cylinder portion 30 via the nozzle through-hole 45, the interior of the head inner cylinder portion 43, the interior of the inner cylinder portion 34 provided in the second cylinder portion 30, and the through-hole 33.

[0034] The nozzle shaft 47 protrudes radially outward from the head inner cylinder 43. The nozzle shaft 47 is inserted inside the nozzle tip 46. The radially outer end of the nozzle shaft 47 faces the lid of the nozzle tip 46 across a gap. The outer peripheral surface of the nozzle shaft 47 faces the inner peripheral surface of the nozzle tip 46 across a gap.

[0035] The movable part 50 is disposed vertically between the first cylinder part 20 and the second cylinder part 30, and is movable downward while being biased upward. The movable part 50 is disposed coaxially with the container axis O and has a cylindrical shape extending vertically. The movable part 50 is open downward. In this embodiment, the movable part 50 has a first plunger 60 and a second plunger 70 fitted onto the first plunger 60.

[0036] The first plunger 60 has a cylindrical shape extending in the vertical direction. The first plunger 60 is disposed coaxially with the container axis O. The first plunger 60 opens downward. The lower end of the first plunger 60 is inserted into the first cylinder portion 20. The upper end of the first plunger 60 is inserted into the second cylinder portion 30. The interior of the first plunger 60 is the interior of the cylindrical movable portion 50. The first plunger 60 has a cylindrical first plunger tube portion 61 extending in the vertical direction, a first piston portion 62 provided at the lower end of the first plunger tube portion 61, and a pressure accumulator valve portion 63 which is the top wall portion of the first plunger 60.

[0037] The first piston portion 62 is disposed inside the first cylinder portion 20. The first piston portion 62 protrudes downward from the radially outer edge portion at the lower end of the first plunger cylindrical portion 61. The first piston portion 62 extends radially outward as it extends downward. The first piston portion 62 is disposed coaxially with the container axis O and has a cylindrical shape that opens downward. The outer peripheral surface at the lower end of the first piston portion 62 is in close contact with the inner peripheral surface of the first cylinder portion 20 over the entire circumference. The first piston portion 62 is disposed inside the first cylinder portion 20 so as to be slidable in the up and down direction. The first piston portion 62 is located below the outside air introduction hole 23 provided in the first cylinder portion 20.

[0038] The accumulator valve portion 63 is disposed coaxially with the container axis O and has a generally conical shape that is convex upward. The outer diameter of the accumulator valve portion 63 at its upper end is smaller than the inner diameter of the through-hole 33 provided in the second cylinder portion 30. The outer diameter of the accumulator valve portion 63 at its lower end is larger than the inner diameter of the through-hole 33 provided in the second cylinder portion 30. The accumulator valve portion 63 is inserted into the through-hole 33 from below and closes the through-hole 33. When the accumulator valve portion 63 closes the through-hole 33, communication between the interior of the second cylinder portion 30 and the discharge hole 48 is blocked. When the accumulator valve portion 63 moves away from the lower side of the through-hole 33, the through-hole 33 is opened, and the interior of the second cylinder portion 30 and the discharge hole 48 are connected to each other. In this manner, the accumulator valve portion 63 can open and close the space between the interior of the second cylinder portion 30 and the discharge hole 48.

[0039] The accumulator valve portion 63 is provided with a communication hole portion 64 that penetrates the accumulator valve portion 63 in the vertical direction. The communication hole portion 64 connects the interior of the first plunger 60 to the exterior of the first plunger 60. The communication hole portion 64 is disposed coaxially with the container axis O and penetrates the radial center portion of the accumulator valve portion 63, i.e., the upper end portion of the accumulator valve portion 63, in the vertical direction. The communication hole portion 64 connects the interior of the first plunger 60 to the discharge hole 48 via the through hole 33 provided in the second cylinder portion 30, the interior of the inner tube portion 34, and the nozzle through hole 45. In other words, the communication hole portion 64 connects the interior of the movable portion 50 to the discharge hole 48.

[0040] The first plunger 60 is provided with a hole 65 that radially penetrates the wall of the first plunger cylindrical portion 61. The hole 65 is provided in the center in the up-down direction of the first plunger cylindrical portion 61. A plurality of holes 65 are provided at intervals along the circumferential direction centered on the container axis O.

[0041] The first plunger 60 is provided with grooves 66 that are recessed radially inward from the outer peripheral surface of the first plunger 60 and extend in the vertical direction. In this embodiment, the grooves 66 extend from a portion of the first plunger cylindrical portion 61 that is located slightly below the hole portions 65 to the upper end of the first plunger cylindrical portion 61. The grooves 66 are open upward. A plurality of the grooves 66 are provided at intervals along the circumferential direction centered on the container axis O. The lower end of each groove 66 is connected to the radially outer end of each hole portion 65.

[0042] The first plunger 60 is provided with a seal protrusion 67 that protrudes radially inward from the inner circumferential surface of the first plunger 60, i.e., the inner circumferential surface of the movable part 50. The seal protrusion 67 extends continuously over the entire circumferential direction. The seal protrusion 67 is provided on a portion of the inner circumferential surface of the first plunger 60 that is located above the hole 65. The seal protrusion 67 is positioned slightly above the hole 65.

[0043] The second plunger 70 has a cylindrical shape with an end extending in the vertical direction. The second plunger 70 is arranged coaxially with the container axis O. The second plunger 70 is open on both vertical sides. The lower end of the second plunger 70 is inserted into the first cylinder portion 20. The upper end of the second plunger 70 is inserted into the second cylinder portion 30. The second plunger 70 has a cylindrical second plunger tube portion 71 extending in the vertical direction, a second piston portion 72 provided at the upper end of the second plunger tube portion 71, and an annular seal piece 73 provided at the lower end of the second plunger tube portion 71.

[0044] The second plunger cylindrical portion 71 is fitted onto and fixed to the first plunger cylindrical portion 61. The lower end of the second plunger cylindrical portion 71 abuts from above against a step portion provided on the outer peripheral surface of the first plunger cylindrical portion 61. The lower end of the second plunger cylindrical portion 71 is inserted into the first cylinder portion 20. The upper end of the second plunger cylindrical portion 71 is inserted into the second cylinder portion 30. The inner peripheral surface of the second plunger cylindrical portion 71 closes the radially outer opening of a groove portion 66 provided on the outer peripheral surface of the first plunger cylindrical portion 61.

[0045] The second piston portion 72 is inserted inside the second cylinder portion 30. The second piston portion 72 protrudes radially outward from the upper end of the second plunger cylindrical portion 71. The second piston portion 72 is disposed coaxially with the container axis O and is cylindrical with an opening on both the up-down direction. The vertical center portion of the second piston portion 72 is connected to the outer circumferential surface of the upper end of the second plunger cylindrical portion 71. The upper portion of the second piston portion 72 extends radially outward as it extends upward. The lower portion of the second piston portion 72 extends radially outward as it extends downward. The outer circumferential surfaces of the upper end of the second piston portion 72 and the lower end of the second piston portion 72 are in close contact with the inner circumferential surface of the second cylinder portion 30 over the entire circumference. The second piston portion 72 is disposed inside the second cylinder portion 30 so as to be slidable in the up-down direction. The area of ​​the surface of the second piston portion 72 that receives the pressure inside the second cylinder portion 30 is larger than the area of ​​the surface of the first piston portion 62 that receives the pressure inside the first cylinder portion 20 .

[0046] The annular seal piece 73 is disposed inside the first cylinder portion 20. The annular seal piece 73 protrudes downward from the radially outer edge portion at the lower end of the second plunger cylindrical portion 71. The annular seal piece 73 extends radially outward as it extends downward. The annular seal piece 73 extends continuously over the entire circumferential direction. The outer peripheral surface at the lower end of the annular seal piece 73 contacts the inner peripheral surface of the first cylinder portion 20 over the entire circumference. The annular seal piece 73 is disposed inside the first cylinder portion 20 so as to be slidable in the up and down direction. The annular seal piece 73 is located above the first piston portion 62. The annular seal piece 73 is located above the outside air introduction hole 23.

[0047] The movable portion 50 is provided with a communication flow path portion 51 that connects the interior of the first cylinder portion 20 and the interior of the second cylinder portion 30. More specifically, the communication flow path portion 51 connects a portion of the interior of the first cylinder portion 20 that is located below the first piston portion 62 and a portion of the interior of the second cylinder portion 30 that is located above the second piston portion 72. In this embodiment, the interior of the communication flow path portion 51 is composed of a portion of the interior of the first plunger 60 that is located below the hole portion 65, the interior of the hole portion 65, and the interior of the groove portion 66. The communication flow path portion 51 opens upward through an upper end opening of the groove portion 66 and communicates with the interior of the second cylinder portion 30. The communication flow path portion 51 opens downward through a lower end opening of the first plunger tube portion 61 and communicates with the interior of the first cylinder portion 20.

[0048] The columnar part 80 includes a columnar main body 81 having a cylindrical shape extending in the vertical direction, and a plurality of leg parts 86 protruding radially outward from the column main body 81. The column main body 81 is arranged coaxially with the container axis O. The lower end part of the column main body 81 is arranged inside the first cylinder part 20. The column main body 81 is inserted into the movable part 50 from below. In this embodiment, the column main body 81 is inserted into the first plunger 60 from below. The upper end part of the column main body 81 is located above the seal protrusion part 67. The upper end part of the column main body 81 is arranged below and spaced from the pressure accumulator valve part 63. The column main body 81 includes an upper part 82 extending in the vertical direction with a constant outer diameter, a reduced diameter part 83 adjacent to the lower part of the upper part 82, and a large diameter part 84 adjacent to the lower part of the reduced diameter part 83.

[0049] The upper part 82 extends downward from near the upper end of the columnar part 80. The entire upper part 82 is disposed inside the movable part 50, i.e., inside the first plunger 60. The lower end of the upper part 82 is located below the hole 65. The outer peripheral surface of the upper part 82 is in close contact with the sealing protrusion 67 over the entire circumferential direction. As the sealing protrusion 67 is in close contact with the outer peripheral surface of the upper part 82, a radial gap between the inner peripheral surface of the movable part 50 and the outer peripheral surface of the columnar part 80 is sealed over the entire circumferential direction.

[0050] The outer diameter of the reduced diameter portion 83 is smaller than the outer diameter of the upper portion 82. The reduced diameter portion 83 is formed from the inside of the movable portion 50 to a position below the movable portion 50. The large diameter portion 84 extends upward from the lower end of the pillar main body 81. The outer diameter of the large diameter portion 84 is larger than the outer diameter of the reduced diameter portion 83. The entire large diameter portion 84 is disposed inside the first cylinder portion 20. Since the reduced diameter portion 83 is formed between the upper portion 82 and the large diameter portion 84 in this manner, an annular recess 85 extending over the entire circumferential direction is formed on the outer peripheral surface of the pillar portion 80.

[0051] The multiple leg portions 86 protrude radially outward from the lower end of the large diameter portion 84. The multiple leg portions 86 are arranged at intervals from one another in the circumferential direction. The lower ends of the leg portions 86 are located below the large diameter portion 84. The lower ends of the leg portions 86 abut against a step portion provided on the inner circumferential surface of the first cylinder portion 20. In this way, the columnar portion 80 is supported from below by the first cylinder portion 20. The leg portions 86 are arranged so as not to interfere with the ball valve 27, which rises as the check valve portion 25 opens.

[0052] A biasing member 89 is fitted onto the columnar portion 80. The biasing member 89 is a coil spring that extends in the vertical direction. The biasing member 89 is housed inside the first cylinder portion 20. The lower end of the biasing member 89 contacts the multiple legs 86 of the columnar portion 80 from above. The upper end of the biasing member 89 contacts the movable portion 50 from below, applying an upward elastic force to the movable portion 50. The biasing member 89 also applies an upward elastic force to the second cylinder portion 30 and the head portion 40 via the movable portion 50. As a result, the biasing member 89 biases the movable portion 50, the second cylinder portion 30, and the head portion 40 upward. In this embodiment, the upper end of the biasing member 89 contacts the lower end of the first plunger tube portion 61.

[0053] The seal portion 90 releasably blocks communication between the interior of the first cylinder portion 20 and the interior of the second cylinder portion 30. The seal portion 90 is provided inside the communicating flow path portion 51, closer to the interior of the first cylinder portion 20 than the hole portion 65. That is, the seal portion 90 is provided in a portion of the interior of the first plunger 60 that is located below the hole portion 65. The seal portion 90 includes a seal protrusion 91 that protrudes from the inner circumferential surface of the first plunger cylindrical portion 61. The seal protrusion 91 is located below the hole portion 65. The seal protrusion 91 extends continuously over the entire circumferential direction. The seal protrusion 91 is in close contact with the outer circumferential surface of the upper portion 82 of the columnar portion 80 over the entire circumference. The inner diameter of the seal protrusion 91 is larger than the outer diameter of the reduced diameter portion 83 of the columnar portion 80.

[0054] Next, the operation of the dispenser 4 of this embodiment will be described. As shown in FIG. 2 , when the head portion 40 is pressed downward against the elastic force of the biasing member 89, the second cylinder portion 30 and the movable portion 50 are pressed downward together with the head portion 40. When the movable portion 50 moves downward, the seal protrusion 91 slides downward on the outer circumferential surface of the upper portion 82 of the column body 81 of the column-shaped portion 80. Thereafter, the seal protrusion 91 rides over the lower edge of the outer circumferential surface of the upper portion 82 of the column body 81 and reaches a position radially opposite to the recessed portion 85. At the position radially opposite to the recessed portion 85, the seal protrusion 91 forms a radial gap with respect to the outer circumferential surface of the column-shaped portion 80 (the bottom of the recessed portion 85). As a result, the seal portion 90 opens communication between the interior of the first cylinder portion 20 and the interior of the second cylinder portion 30 via the communication flow path portion 51 as the movable portion 50 moves downward.

[0055] When the first piston portion 62 of the movable portion 50 moves downward, the volume of the portion of the inside of the first cylinder portion 20 located between the first piston portion 62 and the check valve portion 25 decreases. Note that the check valve portion 25 is in a closed state. Before the seal portion 90 is opened, the inside of the first cylinder portion 20 is pressurized, and the internal pressure of the first cylinder portion 20 increases. At this time, the internal pressure of the first cylinder portion 20 escapes into the inside of the container body 2 through the minute gap 28 of the check valve portion 25. On the other hand, when the seal portion 90 is opened, the inside of the second cylinder portion 30, which is connected to the inside of the first cylinder portion 20 via the communicating flow path portion 51, is pressurized.

[0056] Here, when the head portion 40 is pressed down, the pressure inside the first cylinder portion 20 and the pressure inside the second cylinder portion 30 become the same. However, because the pressure-receiving area of ​​the second piston portion 72 is larger than the pressure-receiving area of ​​the first piston portion 62, the downward force that the movable portion 50 receives from the contents inside the second cylinder portion 30 is greater than the upward force that the movable portion 50 receives from the contents inside the first cylinder portion 20. Therefore, when the insides of the first cylinder portion 20 and the second cylinder portion 30 are pressurized, the pressure inside the second cylinder portion 30 causes the movable portion 50 to move downward relative to the second cylinder portion 30 against the elastic force of the biasing member 89. As a result, the pressure accumulator valve portion 63 moves downwardly relative to the through-hole 33, opening the through-hole 33. Therefore, the contents contained inside the second cylinder portion 30 flow through the through-hole 33 to the nozzle portion 44 and are discharged from the discharge hole 48.

[0057] When the head portion 40 is pushed down, the annular seal piece 73 moves below the outside air introduction hole 23, and the outside air introduction hole 23 communicates with the inside of the guide tube portion 13. As a result, the inside of the container body 2 communicates with the outside of the dispensing container 1 via the gap between the peripheral wall 32 of the second cylinder portion 30 and the guide tube portion 13, the inside of the guide tube portion 13, and the outside air introduction hole 23. Therefore, when the head portion 40 is pushed down to dispense the contents, air outside the dispensing container 1 flows into the inside of the container body 2, and it is possible to prevent a decrease in the pressure inside the container body 2.

[0058] As the head portion 40 is further pressed down and the movable portion 50 moves downward, the sealing protrusion 67 provided on the movable portion 50 reaches a position radially opposite the recess 85 of the columnar portion 80. Here, the sealing protrusion 67 faces the recess 85 in the radial direction when the head portion 40 is pressed down to the bottom end position. That is, the recess 85 faces the sealing protrusion 67 in the radial direction when the head portion 40 is pressed down to the bottom end position. However, as described above, when the contents are discharged, the movable portion 50 is pressed down below the head portion 40 and the second cylinder portion 30. Therefore, the sealing protrusion 67 reaches a position facing the recess 85 before the head portion 40 is pressed down to the bottom end position.

[0059] When the seal protrusion 67 faces the recess 85 in the radial direction, the seal protrusion 67 moves away from the outer circumferential surface of the columnar portion 80 radially outward. Therefore, a radial gap is created between the inner circumferential surface of the movable portion 50 and the outer circumferential surface of the columnar portion 80, and a portion of the interior of the first cylinder portion 20 located below the first piston portion 62 is connected to the communication hole 64, which communicates the interior of the movable portion 50 with the discharge hole 48, via a gap between the outer circumferential surface of the columnar portion 80 and the inner circumferential surface of the movable portion 50 and a portion of the interior of the movable portion 50 located above the columnar portion 80. As a result, when the seal protrusion 67 faces the recess 85 in the radial direction, a portion of the interior of the first cylinder portion 20 located below the first piston portion 62 is connected to the discharge hole 48 via the gap between the inner circumferential surface of the movable portion 50 and the outer circumferential surface of the columnar portion 80 and the communication hole 64. Therefore, at least a part of the content in the first cylinder portion 20 and the air in the first cylinder portion 20 flow from the communication hole portion 64 to the discharge hole 48 and are discharged from the discharge hole 48 to the outside of the dispenser 4.

[0060] In this manner, when the sealing protrusion 67 faces the recess 85 of the columnar portion 80 in the radial direction, the communication hole portion 64 communicates the discharge hole 48 with a portion of the interior of the first cylinder portion 20 located below the first piston portion 62 via a gap between the inner circumferential surface of the movable portion 50 and the outer circumferential surface of the columnar portion 80. This allows the pressure inside the first cylinder portion 20 to escape to the outside of the discharge container 1 through the discharge hole 48. Therefore, after the head portion 40 is pressed down to the bottom end position, the pressure inside the first cylinder portion 20 can be suitably reduced when the head portion 40 is restored upward by the biasing member 89. This allows the contents inside the container body 2 to be suitably sucked into the inside of the first cylinder portion 20 via the suction tube 24. Therefore, the contents can be suitably discharged even when the head portion 40 is pressed down again. Furthermore, by reducing the pressure inside the first cylinder portion 20 and releasing the pressurized state inside the first cylinder portion 20, it is possible to prevent the contents from dripping from the discharge hole 48. In other words, it is possible to prevent the contents from dripping from the discharge hole 48, and it is possible to obtain a dispenser 4 that has good liquid drainage. Furthermore, when priming is performed, the air compressed inside the first cylinder portion 20 can be suitably discharged from the discharge hole 48. This makes it possible to reduce the number of times priming is performed.

[0061] When the sealing protrusion 67 faces the recess 85 in the radial direction and a portion of the interior of the first cylinder portion 20 located below the first piston portion 62 communicates with the discharge hole 48, the pressure inside the first cylinder portion 20 and the pressure inside the second cylinder portion 30 decrease, and the movable portion 50 is pushed up by the biasing member 89. As a result, the accumulator valve portion 63 again closes the through-hole 33. At this time, the head portion 40 is, for example, pushed down to the lower end position. As described above, in this embodiment, when the head portion 40 is pushed down to the lower end position, a portion of the interior of the first cylinder portion 20 located below the first piston portion 62 communicates with the discharge hole 48. Therefore, even if the through-hole 33 is again closed by the pressure accumulator valve portion 63, the contents remaining in a pressurized state inside the first cylinder portion 20 are discharged from the discharge hole 48.

[0062] As described above, according to the dispenser 4 of this embodiment, when the head portion 40 is not pressed down, the seal portion 90 blocks communication between the interior of the first cylinder portion 20 and the interior of the second cylinder portion 30. Therefore, even if the internal pressure of the first cylinder portion 20 increases unintentionally, for example, when an external force is applied to the container body 2 and the increase in internal pressure of the container body 2 spreads to the inside of the first cylinder portion 20, an increase in the internal pressure of the second cylinder portion 30 can be suppressed through the communicating flow path portion 51. This prevents the content inside the second cylinder portion 30 from leaking out of the discharge hole 48.

[0063] The accumulator valve unit 63 is also provided with a communication hole 64 that communicates the interior of the movable unit 50 with the discharge hole 48. The movable unit 50 is provided with an annular sealing protrusion 67 that protrudes radially inward from the inner circumferential surface of the movable unit 50 and contacts the outer circumferential surface of the columnar unit 80. The outer circumferential surface of the columnar unit 80 is provided with a recess 85 that is recessed radially inward and located below the sealing protrusion 67. The movable unit 50 is movable to a position where the sealing protrusion 67 and the recess 85 face each other in the radial direction. When the sealing protrusion 67 faces the recess 85 in the radial direction, a portion of the interior of the first cylinder unit 20 that is located below the first piston unit 62 communicates with the discharge hole 48 via the gap between the inner circumferential surface of the movable unit 50 and the outer circumferential surface of the columnar unit 80 and the communication hole 64. According to this configuration, at least a portion of the contents remaining in a pressurized state in the portion of the first cylinder portion 20 located below the first piston portion 62 can be discharged from the discharge hole 48 to the outside of the dispenser 4 via the gap between the inner circumferential surface of the movable portion 50 and the outer circumferential surface of the columnar portion 80 and the communicating hole portion 64. This prevents the contents that have flowed into the first cylinder portion 20 from returning to the container body 2. Furthermore, since the contents discharged from the first cylinder portion 20 as the pressure in the first cylinder portion 20 is released can be discharged from the discharge hole 48 in this manner, changes in the amount of contents dispensed from the discharge hole 48 can be prevented even if the rate at which the pressure in the first cylinder portion 20 is increased varies depending on the speed at which the head portion 40 is pressed down. Therefore, according to this embodiment, a dispenser 4 having a structure that can stabilize the amount of contents dispensed can be obtained. Furthermore, because a portion of the contents sucked into the first cylinder portion 20 from the container body 2 is not returned to the container body 2, a decrease in the amount of contents dispensed from the discharge hole 48, i.e., the amount of contents dispensed, can be prevented.

[0064] Furthermore, the check valve portion 25 is formed with a minute gap 28 that releases the internal pressure of the first cylinder portion 20. With this configuration, the internal pressure of the first cylinder portion 20 can be released into the container body 2. Therefore, when the head portion 40 is pressed down, the pressure in the space between the seal portion 90 and the check valve portion 25 is prevented from increasing excessively until the flow of the contents is permitted in the seal portion 90. Therefore, the force required to press down the head portion 40 can be prevented from increasing.

[0065] [Second embodiment] Next, a second embodiment will be described with reference to Fig. 3. The second embodiment differs from the first embodiment in that the check valve portion 125 is formed by a columnar portion 180 instead of the ball valve 27. Note that the configuration other than that described below is the same as that of the first embodiment.

[0066] As shown in FIG. 3, the pillar portion 180 includes a pillar body 181 having a large-diameter portion 184, and multiple legs 186. The outer circumferential surface of the lower end of the large-diameter portion 184 tapers downward. The multiple legs 186 protrude radially outward from a portion above the lower end of the large-diameter portion 184. The pillar portion 80 can come into contact with the lower end of the biasing member 89 from below. The pillar portion 80 can move upward against the elastic force of the biasing member 89.

[0067] The check valve 125 is formed by the valve seat 26 and the lower end of the large diameter portion 184 of the columnar portion 180. The outer peripheral surface of the lower end of the large diameter portion 184 is disposed above the inner peripheral surface of the valve seat 26. The lower end of the large diameter portion 184 is movable toward and away from the valve seat 26. The check valve 125 forms a sealing surface by the intimate contact between the inner peripheral surface of the valve seat 26 and the outer peripheral surface of the lower end of the large diameter portion 184. The lower end of the large diameter portion 184 is spaced above the valve seat 26. The check valve 125 communicates between the interior of the first cylinder 20 and the interior of the container body 2 by separating the lower end of the large diameter portion 184 from the valve seat 26. The check valve 125 blocks communication between the interior of the first cylinder 20 and the interior of the container body 2 by seating the lower end of the large diameter portion 184 on the valve seat 26.

[0068] The lower end of the urging member 89 is supported from below by a support rib 129 provided on the inner circumferential surface of the first cylinder portion 20. The support rib 129 is disposed between adjacent leg portions 186 in the circumferential direction. The lower end of the urging member 89 contacts the upper end edges of the leg portions 186 from above. The columnar portion 180 is capable of moving up and down without being subjected to the elastic force of the urging member 89 within a vertical range from an initial position where the upper end edges of the leg portions 186 contact the lower end of the urging member 89 from below, to a lower end position where the lower end of the large diameter portion 184 is seated on the valve seat portion 26.

[0069] Next, the operation of the dispenser 104 of this embodiment will be described. Note that a description of the same operations as those in the first embodiment will be omitted. When the first plunger 60 of the movable part 50 moves downward as the head part 40 is pressed down, the columnar part 180 moves downward due to sliding resistance with at least one of the sealing protrusion 67 and the sealing projection 91 provided on the first plunger 60. In other words, the check valve part 125 is open at the beginning of the operation of pressing down the head part 40. At this time, the internal pressure of the first cylinder part 20 escapes into the container body 2 through the minute gap 128 formed between the valve seat part 26 of the check valve part 125 and the columnar part 180.

[0070] On the other hand, as the head portion 40 continues to be pressed down, the lower end of the large diameter portion 184 of the columnar portion 180 seats on the valve seat portion 26, and the check valve portion 125 enters a closed state. In other words, the minute gap 128 of the check valve portion 125 disappears. The check valve portion 125 enters a closed state simultaneously with or after the seal portion 90 opens. As a result, when the seal portion 90 opens, the inside of the second cylinder portion 30, which is connected to the inside of the first cylinder portion 20 via the communicating flow path portion 51, is pressurized.

[0071] When the head portion 40 moves upward from the lower end position to its original position, the movable portion 50 is pressed by the biasing member 89 and moves upward toward the initial position. As the first plunger 60 moves upward, the columnar portion 180, seated on the valve seat 26, moves upward due to sliding resistance with at least one of the seal protrusion 67 and the seal projection 91. The columnar portion 180 moves upward until the upper edge of the leg portion 186 contacts the lower end of the biasing member 89. As a result, the columnar portion 180 moves the lower end of the large diameter portion 184 upward away from the valve seat 26 and returns to the initial position.

[0072] The dispenser 104 of this embodiment configured in this manner can also achieve the same effects as those of the first embodiment.

[0073] [Third embodiment] Next, a third embodiment will be described with reference to Fig. 4. The third embodiment differs from the first embodiment in that the first plunger cylindrical portion 261 and the first piston portion 262 of the first plunger 260 are formed separately from each other. The third embodiment also differs from the first embodiment in that no minute gap is formed in the check valve portion 25. Note that the configuration other than that described below is the same as that of the first embodiment.

[0074] As shown in FIG. 4, the first plunger cylindrical portion 261 has a configuration in which the first piston portion 62 is omitted from the first plunger cylindrical portion 61 of the first embodiment, and a locking protrusion 268 that protrudes radially outward is provided at the lower end.

[0075] The first piston portion 262 is cylindrical and opens on both the up-down direction and the down-down direction. The first piston portion 262 is disposed inside the first cylinder portion 20 so as to be slidable in the up-down direction. The first piston portion 262 is fitted onto the lower portion of the first plunger tube portion 261 so as to be movable up and down. The upper portion of the first piston portion 262 extends radially outward as it extends upward. The upper end portion of the first piston portion 262 can contact the annular seal piece 73 from below. The upper end portion of the first piston portion 262 is located below the outside air introduction hole 23 provided in the first cylinder portion 20. The lower portion of the first piston portion 262 extends radially outward as it extends downward. The outer peripheral surface at the upper end portion of the first piston portion 262 and the outer peripheral surface at the lower end portion of the first piston portion 262 are in close contact with the inner peripheral surface of the first cylinder portion 20 over the entire circumference.

[0076] The vertical center of the first piston portion 262 protrudes radially inward. The vertical center of the first piston portion 262 can contact the locking protrusion 268 of the first plunger cylindrical portion 261 from above, with a gap between the upper end of the first piston portion 262 and the annular seal piece 73 of the second plunger 70 in the vertical direction. That is, the first piston portion 262 can move up and down within a predetermined range relative to the first plunger cylindrical portion 261 and the second plunger 70. An annular protrusion protruding radially inward and extending continuously over the entire circumferential direction is formed on the inner circumferential surface of the central portion of the first piston portion 262. Two annular protrusions are provided at an interval in the vertical direction. The inner peripheral edge of the annular protrusion is in close contact with the outer peripheral surface of the first plunger cylindrical portion 261 over the entire circumference, above the locking protrusion 268.

[0077] The operation of the dispenser 204 of this embodiment will be described below. Note that a description of the same operations as those in the first embodiment will be omitted. When the first plunger cylindrical portion 261 of the movable portion 50 moves downward as the head portion 40 is pressed down, the first plunger cylindrical portion 261 applies a downward force to the first piston portion 262 due to the sliding resistance between the first plunger cylindrical portion 261 and the first piston portion 262. At this time, the check valve portion 25 is in a closed state. As a result, the internal pressure of the first cylinder portion 20 increases, the downward movement of the first piston portion 262 is restricted, and the first piston portion 262 moves upward relative to the first plunger cylindrical portion 261. As a result, even if a minute gap is not formed in the check valve portion 25, the increase in internal pressure of the first cylinder portion 20 can be alleviated.

[0078] Thereafter, when the first piston portion 262 comes into contact with the annular seal piece 73 of the second plunger 70 from below, it is pushed from above by the annular seal piece 73 and moves downward together with the second plunger 70. It is preferable that the first piston portion 262 comes into contact with the annular seal piece 73 of the second plunger 70 from below simultaneously with or after the seal portion 90 is opened. This causes the inside of the first cylinder portion 20 and the inside of the second cylinder portion 30 to be pressurized.

[0079] When the head portion 40 moves upward from the lower end position, the vertical center portion of the first piston portion 262 is pressed from below by the locking protrusion 268 of the first plunger cylindrical portion 261, and moves upward together with the first plunger cylindrical portion 261. This makes it possible to create a negative pressure inside the first cylinder portion 20, similar to the dispenser 4 of the first embodiment. Note that the first piston portion 262 may move upward together with the first plunger cylindrical portion 261 due to frictional engagement between the annular protrusion and the outer circumferential surface of the first plunger cylindrical portion 261.

[0080] The dispenser 204 of this embodiment configured in this manner can also achieve the same effects as those of the first embodiment.

[0081] [Fourth embodiment] Next, a fourth embodiment will be described with reference to Fig. 5. The fourth embodiment differs from the first embodiment in the configuration of the movable part 350. The fourth embodiment also differs from the first embodiment in that a minute gap is not formed in the check valve part 25. Note that the configuration other than that described below is the same as that of the first embodiment.

[0082] 5, the movable part 350 has a first plunger 360, and a first piston 362 (first piston portion) and a second plunger 370 fitted onto the first plunger 360. The first plunger 360 has a configuration in which the first piston portion 62 is omitted from the first plunger 60 of the first embodiment, and a locking protrusion 368 is provided at the lower end of the first plunger cylindrical portion 61, protruding radially outward.

[0083] The first piston 362 is cylindrical. The first piston 362 is disposed inside the first cylinder portion 20 so as to be slidable in the vertical direction. The first piston 362 includes a tubular portion 362a and a piston body 362b, which are integrally molded as a single member. The tubular portion 362a is formed in a cylindrical shape that opens on both the vertical and horizontal sides, and is fitted onto the lower part of the first plunger tubular portion 61 so as to be movable up and down. The lower end edge of the tubular portion 362a can come into contact with the locking protrusion 368 from above. The upper end portion of the tubular portion 362a extends radially outward as it extends upward.

[0084] The piston body 362b protrudes radially outward from the lower part of the cylindrical portion 362a. The piston body 362b is cylindrical and open on both the top and bottom sides. The upper part of the piston body 362b extends radially outward as it extends upward. The upper end of the piston body 362b is lower than the upper end of the cylindrical portion 362a. The lower part of the piston body 362b extends radially outward as it extends downward. The outer peripheral surfaces of the upper end and the lower end of the piston body 362b are in close contact with the inner peripheral surface of the first cylinder portion 20 over the entire circumference. The piston body 362b closes the outside air introduction hole 23 provided in the first cylinder portion 20. The lower part of the piston body 362b can be inserted from above between the inner peripheral surface of the first cylinder portion 20 and the locking protrusion 368 of the first plunger 360.

[0085] The second plunger 370 has a configuration in which the annular seal piece 73 is omitted from the second plunger 70 of the first embodiment, and the shape of the lower end of the second plunger cylindrical portion 71 is modified. An upwardly recessed step portion 374 is formed around the entire circumference on the lower end surface of the second plunger cylindrical portion 371 of the second plunger 370. The step portion 374 is formed below the groove portion 66 of the first plunger cylindrical portion 61. The step portion 374 is open both downward and radially inward. The inner circumferential surface of the step portion 374 extends vertically with a constant inner diameter. The upper end of the piston body 362b of the first piston 362 is inserted from below into the inside of the step portion 374. The inner circumferential surface of the step portion 374 closely contacts the upper end of the piston body 362b around the entire circumference so as to be slidable vertically. This blocks communication between the gap between the first plunger cylindrical portion 61 and the cylindrical portion 362a of the first piston 362, and between the peripheral wall portion 21 of the first cylinder portion 20 and the second plunger cylindrical portion 371. The lower edge of the second plunger cylindrical portion 371 can come into contact with the upper end of the piston body 362b from above, with a gap being left between the lower end of the cylindrical portion 362a of the first piston 362 and the locking protrusion 368 of the first plunger 360 in the vertical direction. In other words, the first piston 362 can move up and down relative to the first plunger 360 and the second plunger 370.

[0086] The operation of the dispenser 304 of this embodiment will be described below. Note that a description of the same operations as those in the first embodiment will be omitted. When the first plunger 360 and the second plunger 370 of the movable part 350 move downward as the head part 40 is pressed down, the second plunger 370 applies a downward force to the first piston 362 due to the sliding resistance between the first plunger 370 and the first piston 362. At this time, the check valve part 25 is in a closed state. As a result, the internal pressure of the first cylinder part 20 increases, the downward movement of the first piston 362 is restricted, and the first piston 362 moves upward relative to the first plunger 360 and the second plunger 370. As a result, even if a minute gap is not formed in the check valve part 25, the increase in internal pressure of the first cylinder part 20 can be mitigated.

[0087] Thereafter, when the first piston 362 contacts the lower edge of the second plunger cylindrical portion 371 from below, it is pushed from above by the lower edge of the second plunger cylindrical portion 371 and moves downward together with the second plunger 370. Note that it is desirable that the first piston 362 contacts the lower edge of the second plunger cylindrical portion 371 from below simultaneously with or after the seal portion 90 is opened. This causes pressure to be applied to the inside of the first cylinder portion 20 and the inside of the second cylinder portion 30. Furthermore, as the first piston 362 moves downward, the upper end of the piston body 362b moves downward beyond the outside air introduction hole 23, thereby connecting the outside air introduction hole 23 with the inside of the guide cylindrical portion 13. This allows air outside the dispensing container 1 to flow into the container body 2 when the head portion 40 is pushed down to dispense the contents, similar to the dispenser 4 of the first embodiment.

[0088] When the head portion 40 moves upward from the lower end position, the cylindrical portion 362a of the first piston 362 is pushed from below by the locking protrusion 368 of the first plunger 360 and moves upward together with the first plunger 360. This allows the inside of the first cylinder portion 20 to be under negative pressure, similar to the dispenser 4 of the first embodiment.

[0089] The dispenser 304 of this embodiment configured as described above can also achieve the same effects as those of the first embodiment.

[0090] [Fifth embodiment] Next, a fifth embodiment will be described with reference to Fig. 6. The fifth embodiment differs from the first embodiment in that the outer peripheral surface of the columnar portion 480 has a recess 485 instead of the recess 85 of the first embodiment. Note that the configuration other than that described below is the same as that of the first embodiment.

[0091] The first plunger 460 has a configuration in which the communication hole portion 64 and the sealing protrusion portion 67 are omitted from the first plunger 60 of the first embodiment. The columnar portion 480 has a columnar main body 481 instead of the columnar main body 81 of the first embodiment. An upper portion 482 of the columnar main body 481 extends in the vertical direction with a constant outer diameter. The upper portion 482 extends downward from near the upper end of the columnar portion 480. The entire upper portion 482 is located below the hole portion 65.

[0092] The columnar portion 480 further has a plurality of vertical ribs 487 protruding radially outward from the outer peripheral surface of the reduced diameter portion 83. The vertical ribs 487 extend in the up-down direction. The vertical ribs 487 are arranged over the entire length of the reduced diameter portion 83 in the up-down direction. The vertical ribs 487 are arranged at equal intervals in the circumferential direction. In other words, a plurality of groove-shaped recesses 485 extending in the up-down direction are formed at intervals in the circumferential direction on the outer peripheral surface of the columnar portion 480 in this embodiment. The radially outer edge of the vertical ribs 487 extends linearly in the up-down direction radially inward from the outer peripheral surface of the upper portion 482 of the columnar portion 480. However, the radially outer edge of the vertical ribs 487 may be continuous with the outer peripheral surface of the upper portion 482.

[0093] In the dispenser 404 of this embodiment, when the head portion 40 is pressed downward and the first plunger 460 moves downward, the seal protrusion 91 slides downward on the outer circumferential surface of the upper portion 482 of the column main body 481 of the columnar portion 480. Thereafter, the seal protrusion 91 rides over the lower edge of the outer circumferential surface of the upper portion 482 of the column main body 481 and reaches a position radially opposite the recessed portion 485. At the position radially opposite the recessed portion 485, the seal protrusion 91 forms a radial gap with respect to the outer circumferential surface of the columnar portion 480 (the bottom of the recessed portion 485). As a result, the seal portion 90 opens communication between the interior of the first cylinder portion 20 and the interior of the second cylinder portion 30 as the movable portion 50 moves downward. Therefore, the dispenser 404 of this embodiment can also achieve the same effects as those of the first embodiment.

[0094] In the fifth embodiment, the recess 485 is formed in the shape of a groove extending in the vertical direction, but the shape of the recess is not particularly limited. For example, the recess may extend in a spiral shape.

[0095] Furthermore, the present invention is not limited to the above-described embodiment explained with reference to the drawings, and various modifications are possible within the technical scope of the present invention. For example, in the above embodiment, the seal portion 90 is formed by the seal protrusion 91 that is in close contact with the outer circumferential surface of the columnar portion, but is not limited to this configuration. For example, the seal portion may include a seal protrusion that is provided on the outer circumferential surface of the columnar portion and in close contact with the inner circumferential surface of the first plunger cylindrical portion. Additionally, within the scope of the present invention, the components in the above-described embodiments may be replaced with known components as appropriate, and the above-described embodiments and modifications may be combined as appropriate. For example, the recess 485 in the fifth embodiment may be applied instead of the recess 85 in the first to fourth embodiments. Furthermore, the configuration of the movable part in the third or fourth embodiment may be applied to the fifth embodiment. [Explanation of symbols]

[0096] 2...Container body 3...Mouth portion 4,104,204,304,404...Discharger 20...First cylinder portion 25,125...Check valve portion 28,128...Small gap 30...Second cylinder portion 40...Head portion 48...Discharge hole 50,350...Moving portion 51...Communicating flow path portion 62,262...First piston portion 63...Accumulator valve portion 64...Communicating hole portion 67...Seal convex portion 72...Second piston portion 80,180,480...Columnar portion 85,485...Concave portion 90...Seal portion 362...First piston (first piston portion)

Claims

1. A dispenser that is attached to the mouth of a container body that contains contents, a first cylinder portion whose interior is connected to the interior of the container body; a second cylinder portion disposed above the first cylinder portion and movable downward in an upward biased state; a cylindrical movable portion that is disposed between the first cylinder portion and the second cylinder portion in the vertical direction, that is movable downward in an upward biased state, and that opens downward; a head portion having a discharge hole communicating with the interior of the second cylinder portion; Equipped with The movable part is a first piston portion disposed inside the first cylinder portion and slidable in the up-down direction; a second piston portion disposed inside the second cylinder portion and slidable in the up-down direction; a communication flow path portion connecting the interior of the first cylinder portion and the interior of the second cylinder portion; an accumulator valve portion that can open and close between the inside of the second cylinder portion and the discharge hole; and the first cylinder portion is provided with a check valve portion that allows the content to flow from the inside of the container body to the inside of the first cylinder portion and restricts the flow of the content from the inside of the first cylinder portion to the inside of the container body, a seal portion that releasably blocks communication between the interior of the first cylinder portion and the interior of the second cylinder portion via the communication flow path portion as the movable portion moves downward, Dispenser.

2. The check valve portion has a minute gap formed therein, which releases pressure in the first cylinder portion when the pressure in the first cylinder portion increases before the seal portion is opened. The dispenser of claim 1 .

3. Further, a columnar portion is inserted into the movable portion from below, the pressure accumulator valve portion is provided with a communication hole portion that communicates the interior of the movable portion with the discharge hole, the movable portion is provided with an annular seal protrusion that protrudes radially inward from an inner peripheral surface of the movable portion and that comes into contact with an outer peripheral surface of the columnar portion, A recess is provided on the outer peripheral surface of the columnar portion, the recess being recessed radially inward and positioned below the seal protrusion, the movable portion is movable to a position where the seal protrusion and the seal recess face each other in a radial direction, When the sealing protrusion is radially opposed to the recess, a portion of the interior of the first cylinder portion located below the first piston portion communicates with the discharge hole via a gap between an inner peripheral surface of the movable portion and an outer peripheral surface of the columnar portion and the communication hole. The dispenser according to claim 1 or 2.

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