JP2014028639A - Discharging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharging device that prevents foam from liquefying and dripping from a nozzle hole and solidifying, when releasing a push-down head from push-down.SOLUTION: In a discharging device, an air introduction passage 65 for communication between an interior of an air cylinder 23 and an air-liquid mixing chamber 26 is formed between an extrapolation body 45 of an air piston 22 and a stem 12, and an air suction passage 60 for communication between the air introduction passage 65 and a nozzle hole 15 is formed between a push-down head 14 and a top end part 24 of the stem 12. The stem 12 includes: a first seal portion 71 which is alienated downward from the extrapolation body 45 by moving downward in accompaniment with push-down of the push-down head 14 in order to allow the air introduction passage 65 to communicate with the interior of the air cylinder 23; and a second seal portion 72 which abuts on the extrapolation body 45 from above by moving downward in accompaniment with the push-down of the push-down head 14 in order to block communication between the air suction passage 60 and the air introduction passage 65.

Description

  The present invention relates to a dispenser.

Conventionally, for example, as shown in Patent Document 1 below, a pump having a cylindrical stem erected in an upwardly biased state at the mouth of a container main body containing liquid, There is known a discharge device that includes a pressing head disposed at an upper end portion and having a nozzle hole formed therein, and foams and discharges the liquid in the container body from the nozzle hole. In this discharge device, the pump includes a liquid piston linked to the stem, a liquid cylinder in which the liquid piston is housed slidably up and down, an air piston linked to the stem, An air cylinder in which the air piston is housed slidably up and down, and in the discharger, the liquid from the liquid cylinder and the air from the air cylinder are mixed. And a foaming member that is disposed between the gas-liquid mixing chamber and the nozzle hole and foams the gas-liquid mixture mixed in the gas-liquid mixing chamber.
This discharger pushes down the pressing head, moves the stem downward, and operates the pump to foam the liquid in the container body into a foam and discharge it from the nozzle hole.

JP 2009-240853 A

  However, in the conventional discharger, when the foam is discharged from the nozzle hole and the pressing head is released, the foam remaining in the nozzle hole is liquefied again and droops to the outside, or falls into the air. There was a risk of touching and solidifying.

  The present invention has been made in view of such circumstances, and is capable of preventing the foam from liquefying and dripping or solidifying from the nozzle hole when the pressing head is released. The purpose is to provide a vessel.

In order to solve the above problems, the present invention proposes the following means.
The present invention includes a pump having a cylindrical stem erected so as to be movable downward in an upwardly biased state at a mouth portion of a container body in which a liquid is stored, and a nozzle hole formed at an upper end portion of the stem. A discharge head that foams and discharges the liquid in the container body from the nozzle hole, and the pump includes a liquid piston that is linked to the stem, and the liquid piston. Includes a liquid cylinder housed in a vertically slidable manner, an air piston linked to the stem, and an air cylinder in which the air piston is housed in a vertically slidable manner. Inside the discharger is disposed between a gas-liquid mixing chamber for mixing the liquid from the liquid cylinder and the air from the air cylinder, and between the gas-liquid mixing chamber and the nozzle hole, Gas-liquid mixture mixed in gas-liquid mixing chamber A foaming member that foams, and the air piston includes a cylindrical extrapolated body that is extrapolated to the stem, and the air cylinder and the air gap between the outer insert and the stem. An air introduction path that communicates with the gas-liquid mixing chamber is formed, and an air suction path that communicates between the air introduction path and the nozzle hole is formed between the pressing head and the upper end portion of the stem, and the stem In this case, by contacting the extrapolated body from below the extrapolated body, the communication between the air introduction path and the inside of the air cylinder is blocked, and it moves downward as the pressing head is depressed. A first seal portion that is spaced downward from the extrapolated body to allow communication between the air introduction path and the inside of the air cylinder; and Communicating with the air introduction path and pressing the pressing head A second seal portion that is brought into contact with the extrapolated body from above by being moved downward as it is lowered, and that blocks communication between the air suction path and the air introduction path. It is characterized by being able to.

  In the dispenser of the present invention, when the push-down head is pushed down, the stem moves downward along with the push-down, so that the first seal portion of the stem is separated downward from the extrapolated body of the air piston, and the air introduction path And the air cylinder communicate with each other. At this time, the second seal portion of the stem comes into contact with the external insertion body of the air piston from above so that the communication between the air suction path and the air introduction path is blocked. Thus, the air in the air cylinder is supplied from the air introduction path to the gas-liquid mixing chamber without flowing from the air introduction path through the air suction path toward the nozzle hole side.

  Next, when the depression of the pressing head is released, the pressing head moves upward due to the urging force, and the stem also moves upward accordingly, so that the first seal portion of the stem comes into contact with the outer insert from below, Communication between the air introduction path and the air cylinder is interrupted. On the other hand, the second seal portion of the stem is spaced upward from the extraneous member of the air piston, and the air suction passage and the air introduction passage are communicated. At this time, the second seal portion is separated from the extraneous member. While moving upward, negative pressure is generated in the air introduction path between the extrapolated body and the stem, and air is sucked into the air introduction path from the side of the air suction path communicating with the air introduction path.

  Specifically, when the depression of the pressing head is released, the pressing head is filled with a foam formed by foaming a liquid, and the second seal portion is opened on the nozzle hole side of the air introduction path. However, this air introduction path is apparently sealed. Therefore, as described above, when the second seal portion moves upward with respect to the extrapolated body, the volume in the air introduction path increases and negative pressure is generated, and the air in the air suction path and its nozzle hole The foam on the side is drawn toward the air introduction path side.

As described above, when air is drawn into the air introduction path through the air suction path from the nozzle hole side, the foam remaining in the nozzle hole is retreated to the inside of the pressing head. Is prevented from liquefying and dripping down, or being solidified by contact with air.
According to the present invention, the above-described back suction action (action of drawing the foam by negative pressure) can be performed with a simple structure without increasing the number of parts.

  In the dispenser of the present invention, the upper end portion of the extrapolated body is formed in a tapered shape that gradually increases in diameter as it goes upward, and the second seal portion is tapered so that its diameter gradually decreases as it goes downward. It is good also as being formed and contacting the upper end part of the said extrapolation body.

  In this case, since a large contact area between the second seal portion of the stem and the extrapolated body of the air piston can be ensured, airtightness (sealing performance) at the time of abutment between the second seal portion and the extrapolated body can be obtained. Easy to secure.

  According to the ejector of the present invention, when the pressing head is released, it is possible to prevent the foam from liquefying and dripping or solidifying from the nozzle hole.

It is a longitudinal section showing a discharge container provided with a discharger concerning one embodiment of the present invention. It is an enlarged view of the A section of FIG. It is a figure explaining the state which pushed down the pressing-down head of the discharger. It is an enlarged view of the B section of FIG. It is a figure explaining the state which canceled pressing down of the pressing head of a discharger. It is an enlarged view of the C section of FIG.

Hereinafter, with reference to drawings, a discharge container provided with a discharger concerning one embodiment of the present invention is explained.
As shown in FIG. 1, the discharge container 1 includes a container main body 2 in which a liquid is stored, and a discharger 10 attached to the container main body 2.

The discharger 10 has a mounting cap 11 mounted on the mouth portion of the container body 2 and a cylindrical stem that is inserted into the mounting cap 11 so as to be movable downward in an upward biased state and is erected on the mouth portion. 12 and a pressing head 14 provided at the upper end of the stem 12 and having a nozzle hole 15 formed therein.
Then, the discharger 10 pushes down the pressing head 14 to move the stem 12 downward and operates the pump 13 to transfer the liquid in the container body 2 and mix it with air. The foam formed by foaming the liquid mixture is discharged from the nozzle hole 15 of the pressing head 14.

  Here, the central axes of the container main body 2, the mounting cap 11, and the stem 12 are located on a common axis. Hereinafter, this common axis is referred to as the axis O, the direction along the axis O is referred to as the vertical direction, the bottom side of the container body 2 along the vertical direction is referred to as the lower side, the pressing head 14 side is referred to as the upper side, and the axis O A direction orthogonal to the radial direction is referred to as a radial direction, and a direction around the axis O is referred to as a circumferential direction.

The mounting cap 11 has a two-stage structure in which a lower cylinder portion 17 screwed into the mouth portion of the container body 2 and an upper cylinder portion 18 having a smaller diameter than the lower cylinder portion 17 are connected via a connection step portion 19. It has a cylindrical shape.
A restriction member 8 for restricting the downward movement of the pressing head 14 is detachably mounted on the upper cylinder portion 18. The restricting member 8 has a C shape in a top view when the discharger 10 is viewed from above, and is detachably fitted to the upper cylindrical portion 18. The restricting member 8 is directed outwardly in the radial direction. Thus, a grip portion 9 is projected.

The pump 13 includes the stem 12, a liquid piston 20 and an air piston 22 that move up and down in conjunction with the stem 12, a liquid cylinder 21 in which the liquid piston 20 is housed slidably in the vertical direction, And an air cylinder 23 in which an air piston 22 is housed slidably up and down.
The liquid piston 20, the air piston 22, the liquid cylinder 21 and the air cylinder 23 are all formed in a cylindrical shape coaxial with the axis O.
Further, inside the discharger 10, a gas-liquid mixing chamber 26 for mixing the liquid from the liquid cylinder 21 and the air from the air cylinder 23, and between the gas-liquid mixing chamber 26 and the nozzle hole 15 are provided. And a foaming member 54 for foaming the gas-liquid mixture mixed in the gas-liquid mixing chamber 26. In the present embodiment, the gas-liquid mixing chamber 26 and the foam member 54 are disposed on the stem 12.

  The air cylinder 23 includes an annular attachment portion 27 that is sandwiched in the vertical direction between the outer peripheral edge portion of the connection step portion 19 of the mounting cap 11 and the opening end portion (not shown) of the mouth portion of the container body 2. A peripheral wall portion 28 extending downward from the inner peripheral edge of the mounting portion 27 and an annular bottom wall portion 29 projecting radially inward from the peripheral wall portion 28 are provided. In the longitudinal sectional view shown in FIG. 1, the bottom wall 29 extends gradually upward from the peripheral wall 28 toward the inside in the radial direction.

  The liquid cylinder 21 is formed integrally with the air cylinder 23. The liquid cylinder 21 is provided so as to extend downward from the inner peripheral edge of the bottom wall portion 29 of the air cylinder 23 and to the lower side from the lower end of the base cylinder portion 30. And a tapered portion 31 that gradually decreases in diameter as it goes. Further, a plurality of vertical ribs 32 extending in the vertical direction are provided on the inner peripheral surface of the connecting portion of the base cylinder portion 30 and the taper portion 31 in the liquid cylinder 21 so as to protrude in the circumferential direction. . Further, a drooping cylinder 33 arranged coaxially with the axis O is connected to the lower end of the tapered portion 31 downward.

  The liquid piston 20 includes a large-diameter portion 34 that fits in the liquid cylinder 21 so as to be vertically slidable in a liquid-tight state, and a small-diameter portion 35 having a lower end connected to the large-diameter portion 34. Further, the liquid piston 20 is provided by a biasing member 36 interposed between a connecting portion between the large diameter portion 34 and the small diameter portion 35 of the liquid piston 20 and the vertical rib 32 of the liquid cylinder 21. Is biased upward. As the urging member 36, for example, a coil spring or a resin spring can be employed.

  Here, a rod-shaped valve member 37 is inserted into the liquid piston 20, the liquid cylinder 21 and the urging member 36. At the upper end of the valve member 37, a hollow inverted conical upper valve body 39 seated from above the valve seat 38 is mounted on a valve seat 38 formed at the upper end of the liquid piston 20. The part 38 is formed to be separable. A lower valve body 40 spaced upward from the tapered portion 31 of the liquid cylinder 21 is formed at the lower end portion of the valve member 37 so as to be seated on the tapered portion 31. In addition, a guide convex portion 41 disposed between the vertical ribs 32 of the liquid cylinder 21 protrudes from the outer peripheral surface of the lower valve body 40.

  The stem 12 is inserted into the air cylinder 23, and the lower end portion of the stem 12 is externally fitted to the small diameter portion 35 of the liquid piston 20. In addition, the stem 12 has an annular flange portion 42 protruding outward in the radial direction and an annular pedestal portion 43 protruding inward in the radial direction. Are arranged. On the upper surface of the flange portion 42, a seal cylinder 25 protrudes with a gap from the outer peripheral surface of the stem 12. The inner peripheral surface of the seal cylinder 25 has a tapered shape that gradually increases in diameter as it goes upward. Between the outer peripheral surface of the stem 12 and the inner peripheral surface of the seal cylinder 25, a lower end edge of an inner cylinder portion 45 described later of the air piston 22 is detachably inserted. Further, the upper end portion of the stem 12 located above the pedestal portion 43 is disposed in the upper tube portion 18 of the mounting cap 11.

  The gas-liquid mixing chamber 26 is disposed in the stem 12, and in this embodiment, is in the upper end portion of the stem 12. Specifically, a support cylinder 24 that supports the foam member 54 is provided above the pedestal 43 at the upper end of the stem 12, and the gas-liquid mixing chamber 26 is formed between the support cylinder 24 and the pedestal 43. It is formed between. The support cylinder 24 is disposed at the uppermost part of the stem 12, and has an enlarged diameter part 57 that forms an upper part thereof and is fitted to the mounting cylinder part 73 of the pressing head 14, and a reduced diameter part 58 that forms a lower part. have. On the outer peripheral surface of the reduced diameter portion 58, a groove-shaped second communication passage 67 is formed which communicates with the gas-liquid mixing chamber 26 and opens outward in the radial direction. Further, a spherical liquid discharge valve 44 seated on the pedestal portion 43 is provided in the gas-liquid mixing chamber 26, and the liquid discharge valve 44 is formed to be separable from the pedestal portion 43.

The air piston 22 includes an inner cylinder part (cylindrical extrapolation body) 45 extrapolated to the stem 12, an outer cylinder part 46 fitted into the air cylinder 23, and these inner cylinder parts 45. And a connecting portion 47 that connects the outer tube portion 46.
The connecting portion 47 is formed in an annular shape that connects the lower end portion of the inner cylindrical portion 45 and the central portion in the vertical direction of the outer cylindrical portion 46 over the entire circumference. A through hole 50 is formed to communicate between the upper chamber 48 defined above the connecting portion 47 and the lower chamber 49 defined below the connecting portion 47. In addition, the through-hole 50 should just be formed 1 or more, The shape and number can be selected suitably.

  The upper portion of the inner cylinder portion 45 is located in the upper cylinder portion 18, and a gap is formed between the outer peripheral surface of the stem 12 and the portion corresponding to the gas-liquid mixing chamber 26. It is inserted. The gap formed between the upper portion of the inner cylinder portion 45 and the stem 12 serves as a third communication path 68. The third communication path 68 is opened to a first communication path 66 and a second communication path 67 described later, respectively.

The lower portion of the inner cylinder portion 45 is extrapolated with a gap to a large diameter portion 51 located above the flange portion 42 and below the pedestal portion 43 in the stem 12. . The gap between the inner peripheral surface of the lower portion of the inner cylinder portion 45 and the outer peripheral surface of the large-diameter portion 51 serves as a first communication path 66. In addition, a groove extending in the vertical direction may be formed in the large-diameter portion 51 of the stem 12, and in this case, the lower portion of the inner cylinder portion 45 is externally fitted to the large-diameter portion 51 so as to be slidable up and down. At the same time, the inside of the groove is a first communication path 66. The first communication passage 66 is blocked from communicating with the lower chamber 49 when the inner cylinder portion 45 of the air piston 22 is seated on the flange portion 42.
The first communication path 66, the second communication path 67, and the third communication path 68 described above constitute an air introduction path 65 that allows the lower chamber 49 in the air cylinder 23 and the gas-liquid mixing chamber 26 to communicate with each other. ing.

  The lower end edge of the inner cylinder portion 45 is inserted between the large-diameter portion 51 of the stem 12 and the seal cylinder 25 and is seated on the upper surface of the flange portion 42 so as to be separated from above. The upper surface portion of the flange portion 42 with which the lower end edge of the inner cylinder portion 45 abuts is the first seal portion 71 of the stem 12. That is, the first seal portion 71 contacts the inner cylinder portion 45 from below, thereby blocking communication between the air introduction path 65 and the air cylinder 23 and moving downward as the pressing head 14 is pressed down. Thus, the air introduction path 65 and the inside of the air cylinder 23 are communicated with each other so as to be spaced downward from the inner cylinder portion 45.

Further, a tapered surface 55 to be sealed is formed at the upper end portion of the inner cylinder portion 45 so as to gradually increase in diameter as it goes upward.
In addition, a valve cylinder portion 52 is fitted to a portion of the inner cylinder portion 45 that is located below the connection portion with the connection portion 47. An elastically deformable annular intake valve 53 that opens and closes the through-hole 50 projects from the outer peripheral surface of the valve cylinder 52, and the outer peripheral edge of the intake valve 53 can be separated from the lower surface of the connecting portion 47. Close.

  The foam member 54 includes two foam elements 56 mounted in the support cylinder 24 of the stem 12. The foam element 56 is mounted in the enlarged diameter portion 57 of the support cylinder 24. Among these foam elements 56, the lower foam element 56 has a mesh body stretched on the lower opening surface of the cylinder. Thus, the upper foam element 56 has a mesh body stretched on the upper opening surface of the cylinder.

  The pressing head 14 includes a mounting cylinder portion 73 that extends vertically and has the stem 12 fitted therein, and an annular top wall portion that protrudes radially outward from the upper end portion of the mounting cylinder portion 73. 74, and a nozzle cylinder part 75 that protrudes radially outward from a part of the outer peripheral edge of the top wall part 74, communicates inside the mounting cylinder part 73, and has a nozzle hole 15 formed at the tip, And a surrounding tube portion 76 that projects downward from the top wall portion 74 and surrounds the mounting tube portion 73 from the outside in the radial direction. The mounting cylinder part 73, the top wall part 74, and the surrounding cylinder part 76 are arranged coaxially with the axis O.

The upper part 77 of the mounting cylinder part 73 is located in the surrounding cylinder part 76. The lower part 78 of the mounting cylinder part 73 is located in the upper cylinder part 18.
The inner diameter of the upper portion 77 of the mounting cylinder 73 is smaller than the inner diameter of the lower portion 78. In the example shown in FIG. 2, the inner diameter of the upper portion 77 is the inner diameter of the enlarged diameter portion 57 of the support cylinder 24. It is almost equivalent. In FIG. 2, the inner diameter of the lower portion 78 of the mounting cylinder portion 73 is gradually increased toward the lower side, and the upper end portion 78 a of the lower portion 78 is the enlarged diameter portion 57 of the support cylinder 24. Is externally fitted. Moreover, the upper end part of the inner cylinder part 45 is fitted in the site | part located below the upper end part 78a of the lower part 78 in the mounting | wearing cylinder part 73 so that sliding up and down is possible.

  In FIG. 1, an air suction path 60 that connects the air introduction path 65 and the nozzle hole 15 is formed between the mounting cylinder portion 73 of the pressing head 14 and the upper end portion of the stem 12. Specifically, a plurality of grooves 61 extending vertically from the upper portion 77 to the upper end portion 78a of the lower portion 78 are formed on the inner peripheral surface of the mounting cylinder portion 73 at intervals in the circumferential direction. A gap is formed between the inner peripheral surface of the mounting cylinder portion 73 and the outer peripheral surface of the support cylinder 24 of the stem 12 by the groove 61, and the gap forms a part of the air suction path 60.

  The stem 12 is spaced upward from the inner cylinder 45, communicates with the air suction path 60 and the air introduction path 65, and moves downward as the pressing head 14 is pressed down, so that the inner cylinder part A second seal portion 72 that abuts the upper surface of the air intake passage 45 from above and blocks the communication between the air intake passage 60 and the air introduction passage 65 is provided. Specifically, an annular flange portion 62 that protrudes outward in the radial direction and extends along the circumferential direction is formed at a connection portion between the enlarged diameter portion 57 and the reduced diameter portion 58 in the support cylinder 24 of the stem 12. The outer peripheral surface of the flange portion 62 is the second seal portion 72. The second seal portion 72 is formed in a tapered shape that gradually decreases in diameter as it goes downward, and moves downward as the pressing head 14 is pressed down, so that the second sealing portion 72 is placed on the sealed surface 55 at the upper end portion of the inner cylinder portion 45. It comes to contact.

The top wall 74 has a disk shape, and the inside of the nozzle cylinder 75 and the inside of the mounting cylinder 73 communicate with each other through the inside of the top wall 74. The nozzle cylinder portion 75 extends outward in the radial direction, and the tip thereof is slightly inclined downward as it goes outward in the radial direction.
1 and 2, in the lower end portion of the surrounding tube portion 76, a ring-shaped portion 84 that comes into contact with a protruding portion 83 that protrudes annularly from the upper end of the upper tube portion 18 of the mounting cap 11 toward the outside in the radial direction. Are fitted, and entry of liquid or the like into the pressing head 14 is restricted.

In the discharge container 1 configured as described above, the movement toward the lower side of the pressing head 14 is regulated by the regulating member 8 before use.
Therefore, when the discharge container 1 is used, the gripping portion 9 of the regulating member 8 is gripped, the regulating member 8 is relatively moved in the radial direction from the upper cylinder portion 18 of the mounting cap 11, and the regulation from the mounting cap 11 is performed. The member 8 is released.

Next, as shown in FIG. 3, when the pressing head 14 is pushed down, the stem 12 and the liquid piston 20 are pushed down integrally. At this time, since the upper end portion of the inner cylinder portion 45 of the air piston 22 slides on the inner peripheral surface of the mounting cylinder portion 73, the vertical position of the air piston 22 is maintained. A communication gap that communicates the first communication path 66 and the lower chamber 49 is provided between the first seal portion 71 of the flange portion 42 and the lower end edge of the inner cylinder portion 45 of the air piston 22. As a result, the lower chamber 49 and the gas-liquid mixing chamber 26 are communicated with each other through the communication gap and the air introduction path 65. At this time, the support cylinder 24 of the stem 12 is moved downward together with the pressing head 14, and the second seal portion 72 of the flange portion 62 of the support cylinder 24 is placed on the sealed surface 55 of the upper end portion of the inner cylinder portion 45. It abuts from above (see FIG. 4). Thereby, the communication between the third communication path 68 of the air introduction path 65 and the air suction path 60 is blocked.
At this time, the valve member 37 is also moved downward so that the lower valve body 40 of the valve member 37 is seated on the tapered portion 31 of the liquid cylinder 21 so that the lower end opening of the liquid cylinder 21 is closed. It has become.

When the pressing head 14 is pushed down until the second seal portion 72 of the stem 12 contacts the sealed surface 55 of the inner cylinder portion 45, the air piston 22 moves downward together with the pressing head 14, and the air piston 22 The outer cylindrical portion 46 slides downward on the inner peripheral surface of the peripheral wall portion 28 of the air cylinder 23. At this time, the intake valve 53 of the valve cylinder portion 52 of the air piston 22 is kept in close contact with the lower surface of the connecting portion 47, and the through hole 50 is closed. Thereby, the air in the lower chamber 49 is compressed, and this air is transferred to the gas-liquid mixing chamber 26 through the communication gap and the air introduction path 65. In addition, in the example shown in FIG. 3, although the lower end edge of the mounting | wearing cylinder part 73 is contact | abutting from the upper part to the connection part 47 of the piston 22 for air, you may form so that these may not contact | abut.
At this time, while the lower end opening of the liquid cylinder 21 is closed, the urging member 36 is compressed and deformed, the liquid piston 20 is moved downward, and the upper valve body 39 of the valve member 37 is moved to the liquid state. By separating from the valve seat portion 38 of the piston 20 for use, the inside of the liquid cylinder 21 and the inside of the stem 12 are communicated. As a result, the liquid in the liquid cylinder 21 passes through the inside of the valve seat portion 38 and the outside of the upper valve body 39 and is transferred to the gas-liquid mixing chamber 26 in the stem 12.

  As described above, by depressing the pressing head 14, air and liquid are respectively transferred to the gas-liquid mixing chamber 26, and these are merged and mixed in the gas-liquid mixing chamber 26. This gas-liquid mixture is transferred to the foaming member 54 in the support cylinder 24 and is foamed by sequentially passing through the mesh body of the lower foam element 56 and the mesh body of the upper foam element 56 to form a foam body. Thus, the gas flows through the upper portion 77 of the mounting cylinder portion 73 and the nozzle cylinder portion 75 and is discharged from the nozzle hole 15.

Thereafter, when the depression of the pressing head 14 is released, the liquid piston 20 is pushed upward by the elastic restoring force of the urging member 36 as shown in FIG. As a result, as shown in FIG. 1, the valve seat portion 38 of the liquid piston 20 abuts on the upper valve body 39 of the valve member 37 to close the valve seat portion 38, and the contents to the gas-liquid mixing chamber 26 are transferred. The transfer is stopped.
Further, in FIG. 5, the stem 12 and the pressing head 14 are integrally raised together with the rising liquid piston 20, and the first seal portion 71 of the flange portion 42 of the stem 12 is connected to the inner cylinder portion 45 of the air piston 22. By contacting the lower edge, the communication between the lower chamber 49 and the gas-liquid mixing chamber 26 through the air introduction path 65 is blocked, and the transfer of air to the gas-liquid mixing chamber 26 is stopped. After that, the piston 22 for air is pushed up by the elastic restoring force of the biasing member 36 so that the inside of the lower chamber 49 is in a negative pressure state, and the intake valve 53 of the valve cylinder 52 of the piston 22 for air moves downward. The through hole 50 is opened and the outside air is supplied into the lower chamber 49 through the through hole 50 and the upper chamber 48.

  In the discharge container 1 using the discharge device 10 of the present embodiment described above, when the pressing head 14 is pressed down, the stem 12 moves downward along with the pressing down, so that the first seal portion 71 of the stem 12 is used for air. The air introduction path 65 and the inside of the air cylinder 23 communicate with each other while being spaced downward from the inner cylinder portion 45 of the piston 22. Further, at this time, the second seal portion 72 of the stem 12 contacts the inner cylinder portion 45 of the air piston 22 from above, so that the communication between the air suction path 60 and the air introduction path 65 is blocked. Thereby, the air in the air cylinder 23 is supplied from the air introduction path 65 to the gas-liquid mixing chamber 26 without flowing from the air introduction path 65 through the air suction path 60 toward the nozzle hole 15 side.

  Next, when the push-down head 14 is released from being pushed down, the push-down head 14 is moved upward by the urging force, and the stem 12 is also moved upward accordingly, whereby the first seal portion 71 of the stem 12 is moved to the inner cylinder portion 45. Abutting from below, the communication between the air introduction path 65 and the air cylinder 23 is blocked. On the other hand, the second seal portion 72 of the stem 12 is spaced upward from the inner cylinder portion 45 of the air piston 22, and the air suction path 60 and the air introduction path 65 communicate with each other. Is moved upward while being separated from the inner cylinder portion 45, the inside of the air introduction path 65 between the inner cylinder section 45 and the stem 12 becomes negative pressure, and the air intake path 60 communicating with the air introduction path 65 is Then, air is sucked into the air introduction path 65.

  Specifically, when the depression of the pressing head 14 is released, the pressing head 14 is filled with a foam formed by foaming a liquid, and the second seal is formed on the nozzle hole 15 side of the air introduction path 65. Although the portion 72 is open, the air introduction path 65 is apparently sealed. Therefore, as shown in FIG. 6, the second seal portion 72 moves upward by a distance L with respect to the sealed surface 55 of the inner cylinder portion 45, so that the volume in the air introduction path 65 increases according to the distance L. As a result, negative pressure is generated, and the air in the air suction path 60 and the foam on the nozzle hole 15 side are drawn in the direction of arrow F toward the air introduction path 65 side.

As described above, when air is drawn into the air introduction path 65 from the nozzle hole 15 side through the air suction path 60, the foam remaining in the nozzle hole 15 is radially inward in the nozzle cylinder portion 75 of the pressing head 14. In addition, since the foam body is retracted into the mounting cylinder portion 73, the foam body is prevented from liquefying and dripping from the nozzle hole 15 or being solidified by touching air.
According to the present embodiment, the above-described back suction action (action of drawing the foam by negative pressure) can be performed with a simple structure without increasing the number of parts.

  Further, the sealed surface 55 at the upper end of the inner cylinder portion 45 is formed in a tapered shape that gradually increases in diameter as it goes upward, and the second seal portion 72 is formed in a taper shape that gradually decreases in diameter as it goes downward. Thus, it comes into contact with the surface to be sealed 55. Accordingly, since a large contact area between the second seal portion 72 of the stem 12 and the inner cylinder portion 45 of the air piston 22 can be ensured, airtightness at the time of contact between the second seal portion 72 and the inner cylinder portion 45 is ensured. It is easy to ensure (sealing).

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

  For example, in the above-described embodiment, the gas-liquid mixing chamber 26 and the foaming member 54 are provided in the stem 12, but the present invention is not limited to this, and any of the gas-liquid mixing chamber 26 and the foaming member 54 is provided. One or more of them may be provided in the mounting cylinder portion 73 of the pressing head 14.

In the above-described embodiment, the tapered second seal portion 72 and the sealed surface 55 (the upper end portion of the inner cylinder portion 45) are in contact with each other, so that the air suction path 60 and the air introduction path 65 are in contact with each other. However, this is not a limitation. That is, for example, the lower end surface of the flange portion 62 is the second seal portion 72, and the second seal portion 72 is in contact with the sealed surface 55 that is a plane orthogonal to the axis O from above, so that the air The communication between the suction path 60 and the air introduction path 65 may be blocked.
Further, the regulating member 8, the protruding portion 83, and the ring-shaped portion 84 may not be provided.

  In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

2 Container Body 10 Discharger 12 Stem 13 Pump 14 Pressing Head 15 Nozzle Hole 20 Liquid Piston 21 Liquid Cylinder 22 Air Piston 23 Air Cylinder 24 Support Tube (Upper End of Stem)
26 Gas-liquid mixing chamber 45 Inner cylinder part (tubular extrapolation body)
54 Foamed member 55 Surface to be sealed (upper end of extrapolated body)
60 Air intake path 65 Air introduction path 71 First seal part 72 Second seal part

Claims (2)

A pump having a cylindrical stem erected in an upwardly biased state at the mouth of the container body containing the liquid; and
A pressing head disposed at the upper end of the stem and having a nozzle hole formed thereon,
A discharger that foams and discharges the liquid in the container body from the nozzle hole,
The pump includes
A liquid piston linked to the stem;
A liquid cylinder in which the liquid piston is housed slidably up and down;
An air piston linked to the stem;
An air cylinder in which the air piston is housed slidably up and down;
Inside the dispenser,
A gas-liquid mixing chamber for mixing the liquid from the liquid cylinder and the air from the air cylinder;
A foaming member that is disposed between the gas-liquid mixing chamber and the nozzle hole and foams the gas-liquid mixture mixed in the gas-liquid mixing chamber;
The air piston includes a cylindrical extrapolated body extrapolated to the stem,
Between the extrapolated body and the stem, an air introduction path is formed to communicate the inside of the air cylinder and the gas-liquid mixing chamber,
An air suction path that connects the air introduction path and the nozzle hole is formed between the pressing head and the upper end portion of the stem,
The stem includes
By contacting the extrapolated body from below the extrapolated body, the communication between the air introduction path and the inside of the air cylinder is cut off, and the downward movement is performed as the pressing head is pushed down. A first seal portion spaced downward from the extrapolated body and communicating the air introduction path and the inside of the air cylinder;
The upper insertion body is separated from the outer insertion body, communicates the air suction path and the air introduction path, and moves downward as the pressing head is pushed down. And a second seal portion that abuts from above and blocks communication between the air suction path and the air introduction path. The dispenser according to claim 1, wherein
The upper end portion of the extrapolated body is formed in a tapered shape that gradually increases in diameter as it goes upward,
The second seal portion is formed in a tapered shape that gradually decreases in diameter as it goes downward, and is in contact with an upper end portion of the extrapolated body.

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