JP2016059910A - Pump dispenser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump dispenser which is excellent in durability, for example, capable of maintaining a function as a pump even in repeated use.SOLUTION: A pump dispenser 1 comprises: a liquid cylinder part 11; a liquid piston 23; a cylindrical plug 32 which is closed by being abutted against a communication port 35 communicating a container and the liquid cylinder part 11; an inner rod 31 whose tip end part is inserted into a plug 32 and the rear end part penetrates the liquid piston 23; and an outflow valve part 41 which is formed by a penetration part and a rear end part of the liquid piston 23 and is open by pressing down the liquid piston 23 with a nozzle part 5. An umbrella-shaped slide part 38, which is in slide-contact with an inner peripheral surface of the plug 32 while maintaining a liquid-tight state, and acts so that internal pressure of the liquid cylinder part 11 increased by pressing down the liquid piston 23 with the nozzle part 5 expands the outer diameter, is formed in the inner rod 31.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pump dispenser that discharges liquid pushed out from a liquid cylinder part from a discharge hole of the nozzle part by pushing down a nozzle part to reduce an internal volume.

  An example of this type of pump dispenser is described in Patent Document 1. Inside the liquid cylinder part of the pump dispenser, a liquid piston that is pushed down by the pushing down force of the nozzle part, a columnar valve member that is moved below the liquid cylinder part by the elastic force of a spring, and a tubular shape as a whole The lower valve body is arranged. An opening is formed at the upper end of the lower valve body, and the large-diameter portion of the valve member is in contact with and slides in the opening while maintaining a liquid-tight state. The lower end of the lower valve body is adapted to be engaged with and separated from a communication port that communicates between the liquid cylinder portion and the inside of the container. When the nozzle part is pushed down, the liquid piston and the valve member move below the liquid cylinder part by receiving the pushing force. In this case, the lower valve body is moved below the liquid cylinder portion by a frictional force or an adhesion force between the opening of the lower valve body and the large diameter portion of the valve member. As a result, the lower end portion of the lower valve body is engaged with the communication port between the liquid cylinder portion and the inside of the container, and the communication state between the liquid cylinder portion and the inside of the container is blocked.

JP 2008-207159 A

  In the configuration described in Patent Document 1, when the contact portion between the opening of the lower valve body and the large-diameter portion of the valve member wears, the frictional force or adhesion between them decreases. When such a situation occurs, it becomes difficult to move the lower valve body below the liquid cylinder portion, and it is difficult to engage the lower end portion of the lower valve body with the opening between the liquid cylinder portion and the inside of the container. There is a possibility. That is, there is a possibility that the communication state between the liquid cylinder part and the inside of the container cannot be blocked. As a result, even if the nozzle part is pushed down, the liquid cannot be pushed out from the liquid cylinder part.

  This invention was made paying attention to said technical subject, Comprising: It aims at providing the pump dispenser excellent in durability, such as being able to maintain the function as a pump even if it uses repeatedly. is there.

  In order to achieve the above object, the invention of claim 1 is directed to a liquid cylinder part formed in communication with the container inside a cap attached to a mouth part of the container, and an internal volume of the liquid cylinder part is increased or decreased. A cylindrical piston plug that is fitted into the liquid cylinder portion so as to close the communication port by being abutted from the inside of the liquid cylinder portion to a communication port that allows the container and the liquid cylinder portion to communicate with each other. An inner rod having a leading end inserted into the plug and having a rear end penetrating the liquid piston, a penetrating portion of the liquid piston penetrating the rear end portion of the inner rod, and a rear of the inner rod. The liquid piston is formed by an end portion, and the liquid piston is opened by being pushed down by a nozzle portion that is attached to the cap so as to move up and down. An internal pressure of the liquid cylinder portion that is increased by sliding in contact with the inner peripheral surface of the plug while maintaining a liquid-tight state and pushing down the liquid piston by the nozzle portion. Is characterized in that the inner rod is formed with an umbrella-shaped sliding portion that acts to increase the outer diameter.

  According to a second aspect of the present invention, in the first aspect of the present invention, a groove portion into which the outer peripheral edge of the sliding portion is fitted is formed over the entire inner peripheral surface of the plug. The pump dispenser is characterized by the above.

  According to the first aspect of the present invention, the umbrella-shaped sliding portion formed on the inner rod contacts and slides on the inner peripheral surface of the cylindrical plug while maintaining a liquid-tight state. Further, the sliding portion receives the internal pressure of the liquid cylinder portion increased by the liquid piston being pushed down, and is brought into close contact with the inner peripheral surface of the plug. Therefore, even if it is used repeatedly, the plug and the inner rod can be brought into close contact with each other. Accordingly, the plug can be moved up and down so as to follow the inner rod, and the plug can be reliably engaged and separated from the communication port for communicating the liquid cylinder portion and the container. That is, even if it is used repeatedly, the function as a pump can be maintained, and a highly durable pump dispenser can be obtained.

  According to the invention of claim 2, the plug can be securely fitted according to the vertical movement of the inner rod by fitting the umbrella-shaped sliding portion into the annular groove formed on the inner peripheral surface of the plug. Can be moved up and down.

It is sectional drawing which shows an example of the pump dispenser which concerns on this invention. It is sectional drawing of the arrow A shown in FIG. It is sectional drawing which shows an example of the inner rod in this invention. It is a front view of the inner rod shown in FIG. It is sectional drawing which shows an example of the plug in this invention. It is a front view of the plug shown in FIG. It is sectional drawing which shows the state which pushed down the nozzle part in the pump dispenser shown in FIG. It is sectional drawing which shows the state which further pushed down the nozzle part in the pump dispenser shown in FIG.

  The pump dispenser according to the present invention is a so-called pump former, and is configured to form bubbles by mixing a liquid filled in a container and air, and to discharge the bubbles. FIG. 1 is a cross-sectional view showing an example of a pump dispenser according to the present invention. The pump dispenser 1 includes a cap 2 that is attached to a mouth portion (not shown) of a container, and an opening 3 is formed at the center of the upper surface of the cap 2. A cylindrical guide stem 4 is erected from the edge of the opening 3 upward in FIG. Inside the guide stem portion 4, a nozzle portion 5 is inserted so as to be movable up and down.

  The nozzle portion 5 includes a discharge port 6 for discharging the bubbles, an inner cylinder portion 7 whose inside is the bubble discharge passage, and a guide stem portion that is disposed radially outward from the inner cylinder portion 7. 4 and an outer cylindrical portion 8 that moves up and down along the outer peripheral surface. The inner cylinder portion 7 is inserted inside the guide stem portion 4 so as to be movable up and down, and is connected to one end portion of an air piston described later. A first air passage 9 is formed between the outer peripheral surface of the inner cylinder portion 7 and the inner peripheral surface of the guide stem portion 4, and air is introduced into the air cylinder portion and the container via the first air passage 9. Is configured to introduce. FIG. 1 shows a state in which the nozzle portion 5 is disposed at the upper limit position.

  A cylinder 12 in which a large-diameter air cylinder portion 10 and a small-diameter liquid cylinder portion 11 are integrally formed is attached to the inside of the cap 2. The air cylinder part 10 is formed with a first vent hole 13 for introducing outside air into the container. The first vent hole 13 is formed by an air piston 14 disposed inside the air cylinder part 10. It is designed to be opened and closed. Specifically, the first vent hole 13 is opened when the air piston 14 is pushed downward in FIG. 1 in response to the pushing force of the nozzle portion 5, and the inside and outside of the container are connected to the first air passage 9. And it communicates via the first vent hole 13. On the contrary, when the air piston 14 is pushed upward in FIG. 1 by a spring, which will be described later, the air piston 14 is closed and closed, and the communication state is blocked.

  In the example shown here, the air piston 14 is formed in a stepped shape, and one end portion thereof, that is, the upper end portion in the vertical direction in FIG. It is fitted inside. The other end of the air piston 14, that is, the lower end in the vertical direction in FIG. 1, has a large diameter, and this lower end is in contact with the inner peripheral surface of the air cylinder 10 while maintaining an airtight state, and It is configured to slide. A second ventilation hole 15 for introducing air into the air chamber is formed in an intermediate portion between the upper end portion and the lower end portion of the air piston 14. A molding valve 16 that connects the air chamber and the outside of the container according to the internal pressure of the air chamber and the air chamber and the mixing chamber 17 is attached to the intermediate portion. The air chamber and the molding valve 16 will be described later.

  A liquid piston is disposed inside the air piston 14, and a space defined by the inner portion of the upper end portion of the air piston 14 and the upper end portion of the liquid piston is a mixing chamber 17. The configuration of the liquid piston will be described later. The mixing chamber 17 is for mixing the liquid filled in the container and air to form bubbles, and the liquid is supplied from a liquid chamber described later, and the air is supplied from the air chamber. The A bubble discharge hole 18 is formed in the upper end portion of the air piston 14, and the mixing chamber 17 and the discharge passage of the inner cylinder portion 7 communicate with each other through the bubble discharge hole 18. As shown in FIG. 1, a net holder 19 is provided in the discharge passage. The net holder 19 is for uniformly reducing the size of the foam by allowing the foam formed in the mixing chamber 17 to pass therethrough. As an example, the net holder 19 is attached to both ends of a cylindrical holder. Configured. Among these nets, the mesh of the net attached to the mixing chamber 17 side is coarser than the mesh of the net attached to the discharge port 6 side. Foam homogenized by passing through the net holder 19 is discharged into the discharge passage.

  The configuration of the molded valve 16 will be briefly described. The molded valve 16 includes a cylindrical shaft portion 20, an annular outer valve portion 21 extending outward in the radial direction, and an annular inner valve portion 22 extending inward in the radial direction. The shaft portion 20 is fitted in a recess formed in an intermediate portion of the air piston 14. The outer valve portion 21 closes the second vent hole 15 when the internal pressure of the air chamber increases from the pressure outside the container, and opens the second vent hole 15 when the internal pressure of the air chamber decreases below the pressure outside the container. Further, the second vent hole 15 is covered from the inside of the air chamber. The outer valve portion 21 and the second vent hole 15 constitute an air supply valve that introduces or blocks outside air to the air chamber. The inner valve portion 22 is opened when the internal pressure is higher than the pressure outside the container, and communicates with the air chamber and the mixing chamber 17, and is closed when the internal pressure is lower than the pressure outside the container. In order to cut off the communication state with the mixing chamber 17, it is in contact with an annular protrusion of the liquid piston, which will be described later. An air discharge valve that supplies or pushes air from the air chamber to the mixing chamber 17 is configured by the inner valve portion 22 and the annular protrusion.

  A liquid piston 23 formed in a cylindrical shape as a whole is disposed concentrically inside the air piston 14. One end of the liquid piston 23, that is, the upper end in the vertical direction in FIG. 1 is in contact with the inner side of the upper end of the air piston 14. Therefore, the liquid piston 23 is pushed down together with the air piston 14 when the air piston 14 is pushed down by receiving the pushing force of the nozzle portion 5. The above-described mixing chamber 17 is formed between the upper end portion of the liquid piston 23 and the upper end portion of the air piston 14. A through hole is formed in the central portion of the upper end portion of the liquid piston 23, and the inner peripheral surface of the through hole has a funnel shape or a mortar shape in which the inner diameter gradually increases from the lower side to the upper side in FIG. It is an inclined surface. This inclined surface functions as a valve seat portion of a second check valve to be described later, and the large diameter portion of the inner rod is engaged and separated according to the vertical movement of the nozzle portion 5. This inclined surface is referred to as a second valve seat portion 24 in the following description. Further, one end of a spring described later is brought into contact with the inner surface of the upper end of the liquid piston 23. In addition, the through hole mentioned above is equivalent to the penetration part in this invention.

  A gap is formed between the outer peripheral surface of the upper end portion of the liquid piston 23 and the inner peripheral surface of the upper end portion of the air piston 14 as shown in FIG. It has become. The second air passage 25 communicates with the mixing chamber 17 through a notch 26 formed inside the upper end of the air piston 14. A flange-like annular protrusion 27 is formed on the outer peripheral surface of the liquid piston 23 below the second air passage 25. The annular protrusion 27 comes into contact with the upper end portion of the liquid cylinder portion 11 when the liquid piston 23 is pressed down by receiving the pressing force of the nozzle portion 5. That is, the lower limit position of the liquid piston 23 in the liquid cylinder portion 11 is regulated by the annular protrusion 27. Moreover, the lower limit position of the nozzle part 5 is regulated by this. The annular protrusion 27 is in contact with the inner valve portion 22 of the molded valve 16 as described above. As shown in FIG. 1, when the nozzle portion 5 is disposed at the upper limit position, a part of the other end portion of the liquid piston 23 is inserted into the liquid cylinder portion 11.

  A space defined by the air cylinder portion 10, the air piston 14, and the liquid piston 23 is an air chamber 28. Further, a space defined by the liquid cylinder portion 11 and the liquid piston 23 is a liquid chamber 29. Inside the liquid chamber 29, a spring 30, an inner rod 31 that is a rod-shaped valve body, and a cylindrical plug 32 are inserted. First, the spring 30 will be described. The spring 30 is, for example, a coil spring 30 that presses the air piston 14 and the liquid piston 23 upward in FIG. That is, the nozzle part 5 is pushed down in FIG. 1 by a pushing force against the elastic force of the spring 30. Further, when the above-described pushing force is reduced and the elastic force becomes larger than the pushing-down force, the pistons 14 and 23 are pushed upward by the elastic force. In the example shown in FIG. 1, one end portion of the spring 30 is in contact with the inner surface of the upper end portion of the liquid piston 23, and the other end portion is a spring receiving portion formed on the bottom portion of the liquid cylinder portion 11. 33 abuts. FIG. 2 is a cross-sectional view taken along arrow A shown in FIG. 1, and the spring receiving portions 33 are formed at equal intervals on the bottom of the liquid cylinder portion 11 as shown in FIG. 2. A projection 34 formed on the outer peripheral surface of the plug 32 is arranged between the spring receiving portions 33.

  A communication port 35 that allows the liquid cylinder unit 11 and the inside of the container to communicate with each other is formed at the lower end of the liquid cylinder unit 11. The inner peripheral surface of the communication port 35 on the liquid cylinder unit 11 side is the lower side of FIG. It is formed in the shape of a funnel or a mortar that gradually increases in inner diameter from the top to the top. This is a valve seat portion of a first check valve which will be described later. This valve seat portion is referred to as a first valve seat portion 36 in the following description. As will be described later, one end portion of the plug 32 is abutted and engaged with the first valve seat portion 36 to close the communication port 35. A liquid introduction pipe (not shown) is connected to the communication port 35. The liquid guide pipe is for introducing the liquid filled in the container into the liquid cylinder part 11 and extends to the bottom of the container.

  FIG. 3 is a sectional view showing an example of the inner rod in the present invention, and FIG. 4 is a front view of the inner rod shown in FIG. As shown in FIGS. 3 and 4, the inner rod 31 is a rod-like member as a whole, and is made of a material that is elastically deformed as an example. An umbrella-shaped, conical or tapered sliding portion 38 is formed at one end of the rod portion 37 of the inner rod 31. The sliding portion 38 is in contact with the inner peripheral surface of the plug 32 while maintaining a liquid-tight state, and slides on the inner peripheral surface of the plug 32 in that state. The sliding portion 38 is brought into close contact with the inner peripheral surface of the plug 32 by receiving the internal pressure of the liquid cylinder portion 11 increased by the liquid piston 23 being pushed down. The outer diameter of the sliding portion 38 is slightly larger than the inner diameter of the body portion of the plug 32. Therefore, it is elastically deformed to reduce its outer diameter and inserted into the plug 32. The outer diameter of the sliding portion 38 is, for example, larger than the inner diameter of the body portion of the plug 32 by 0.1 mm to 0.5 mm. When the inner diameter of the plug 32 and the outer diameter of the sliding portion 38 are the same, and when the outer diameter of the sliding portion 38 is smaller than the inner diameter of the plug 32, the frictional force between them or Adhesion may not be ensured. In addition, when the outer diameter of the sliding portion 38 is larger than 0.5 mm with respect to the inner diameter of the plug 32, the frictional force or the adhesion force becomes excessive, and the inside of the plug 32 slides inside the sliding portion 38. May become difficult to slide.

  A large diameter portion 39 larger than the outer diameter of the rod portion 37 and the sliding portion 38 is formed at the other end portion of the rod portion 37 in the inner rod 31. The large diameter portion 39 is formed with a tapered inclined surface 40 that engages with the second valve seat portion 24. That is, the large diameter portion 39 functions as the valve body of the above-described second check valve, and the second check valve 41 is configured by the large diameter portion 39 and the second valve seat portion 24. When the inclined surface 40 of the large diameter portion 39 is engaged with the second valve seat portion 24, the second check valve 41 is closed and the upper portion of the liquid chamber 29 is closed as shown in FIG. . Moreover, in the example shown here, the cavity part 42 is formed in the inner part of the large diameter part 39 as shown in FIG. By doing so, the material cost can be reduced by the amount of the cavity 42. Note that one end portion (sliding portion side) of the rod portion 37 in the inner rod 31 described above corresponds to the tip portion of the inner rod in the present invention, and the other end portion of the rod portion 37 in the inner rod 31 described above. The (large diameter portion side) corresponds to the rear end portion of the inner rod in the present invention. The second check valve 41 described above corresponds to the outflow valve portion in the present invention.

  FIG. 5 is a cross-sectional view showing an example of the plug according to the present invention, and FIG. 6 is a front view of the plug shown in FIG. As shown in FIGS. 5 and 6, the plug 32 is a cylindrical member as a whole, and includes a trunk portion 43 having an inner diameter slightly smaller than the outer diameter of the sliding portion 38. The sliding portion 38 of the inner rod 31 is inserted. A stopper 44 is formed at one end of the body 43. The retaining portion 44 is for preventing the sliding portion 38 from easily coming out of the body portion 43. For example, the body portion 43 is disposed so that the outer peripheral edge of the sliding portion 38 of the inner rod 31 is caught. The inner diameter is smaller than the inner diameter.

  Adjacent to the retaining portion 44, a groove portion having an inner diameter that is the same as or slightly larger than the outer diameter of the sliding portion 38 is formed over the entire circumference of the inner peripheral surface of the body portion 43. Yes. Note that the inner diameter of the groove is larger than the inner diameter of the body 43. In the following description, this groove portion is referred to as an annular groove portion 45. The outer peripheral edge of the sliding portion 38 is fitted into the annular groove 45. FIG. 1 shows a state in which the sliding portion 38 is fitted in the annular groove 45. In the state shown in FIG. 1, the inner rod 31 is pulled upward in FIG. 1 by the elastic force of the spring 30, and the outer peripheral edge of the sliding portion 38 is a retaining portion of the inner surface of the annular groove 45. It is in contact with the 44 side surface. That is, the outer peripheral edge of the sliding portion 38 is caught by the annular groove 45. In this manner, the outer diameter of the sliding portion 38 can also be increased by pulling the inner rod 31 upward in FIG.

  A tapered surface 46 is formed at the other end of the body portion 43 so as to abut against the first valve seat portion 36 and close the communication port 35. That is, the first check valve 47 is configured by the tapered surface 46 of the plug 32 and the first valve seat portion 36 in a state where the sliding portion 38 of the inner rod 31 is inserted. Then, the plug 32 is moved downward in FIG. 1 by the inner rod 31 and the tapered surface 46 is engaged with the first valve seat portion 36, whereby the first check valve 47 is closed and the liquid chamber 29 is closed. The lower part is closed. Further, as described above, the plurality of protrusions 34 are provided at equal intervals on the outer peripheral surface of the body portion 43 on the other end side. These protrusions 34 come into contact with the other end of the spring 30 together with the spring receiving portion 33 when the nozzle portion 5 is disposed at the upper limit position. In this case, each protrusion 34 is disposed between the spring receiving portions 33 as shown in FIG. Further, when the nozzle portion 5 is pushed down, each protrusion 34 is separated from the other end of the spring 30 and finally comes into contact with the bottom of the liquid cylinder portion 11.

  The operation of the pump dispenser 1 configured as described above will be described. As shown in FIG. 1, when the nozzle portion 5 is disposed at the upper limit position, the air piston 14 and the liquid piston 23 are pushed upward in FIG. 1 by the elastic force of the spring 30. The inclined surface 40 of the large diameter portion 39 in the inner rod 31 is engaged with the second valve seat portion 24, and the second check valve 41 is closed. Further, the sliding portion 38 of the inner rod 31 is fitted into the annular groove 45 of the plug 32 and is pulled upward in FIG. Therefore, a load in the direction of expanding the outer diameter acts on the sliding portion 38 and is in contact with the inner peripheral surface of the plug 32 while maintaining a liquid-tight state. The plug 32 is pulled up by the inner rod 31 in FIG.

  As described above, since the plug 32 is pulled upward in FIG. 1, the tapered surface 46 and the first valve seat portion 36 at the other end of the plug 32 are separated from each other, and the first check valve 47 is It is open. As a result, the liquid chamber 29 is closed with respect to the mixing chamber 17 and is open with respect to the inside of the container. The first vent hole 13 is closed by the lower end portion of the air piston 14, and the inside of the container is closed with respect to the outside of the container. Further, the communication state between the air chamber 28 and the mixing chamber 17 is blocked by the inner valve portion 22 of the molding valve 16, and the communication state between the air chamber 28 and the outside of the container is blocked by the outer valve portion 21 of the molding valve 16. .

  When the nozzle portion 5 is slightly pushed down from the state shown in FIG. 1, the air piston 14 and the liquid piston 23 are pushed down by receiving the pushing force. Further, the inclined surface 40 of the large diameter portion 39 of the inner rod 31 is separated from the second valve seat portion 24, and the second check valve 41 is opened. As the pistons 14 and 23 are pushed down, the spring 30 in the liquid chamber 29 contracts, and the internal volumes of the air chamber 28 and the liquid chamber 29 decrease. Thereby, each internal pressure of the air chamber 28 and the liquid chamber 29 increases. When the nozzle portion 5 is further pushed down, the upper portion of the large-diameter portion 39 of the inner rod 31 comes into contact with the inner side of the upper end portion of the air piston 14 as shown in FIG. When the nozzle portion 5 is pushed down from this state, the inner rod 31 is pushed down by the air piston 14. Since the sliding portion 38 of the inner rod 31 is fitted in the annular groove portion 45 of the plug 32 while maintaining a liquid-tight state, when the inner rod 31 is pushed down as described above, the plug 32 is pushed down accordingly. . In this manner, the inner rod 31 and the plug 32 are lowered integrally with a slight delay after the nozzle portion 5 and the pistons 14 and 23 are lowered. Then, the tapered surface 46 of the plug 32 engages with the first valve seat portion 36 to stop the lowering of the plug 32, and the first check valve 47 is closed.

  The nozzle part 5 is further pushed down from the state mentioned above. When the pressing force of the nozzle portion 5 is larger than the force for retaining the sliding portion 38 in the annular groove portion 45, the sliding portion 38 of the inner rod 31 is moved from the annular groove portion 45 of the plug 32 by the above-described pressing force. Get out. The sliding portion 38 is in contact with the inner peripheral surface of the body portion 43 of the plug 32 while maintaining a liquid-tight state, and slides on the inner peripheral surface. In this case, the internal pressure of the liquid chamber 29 increased as the liquid piston 23 descends acts on the sliding portion 38 so as to increase the outer diameter thereof. As a result, the sliding portion 38 is brought into close contact with the inner peripheral surface of the plug 32. As a result, the plug 32 is pressed toward the first valve seat 36 by the inner rod 31, and the first check valve 47 is kept closed. Further, as described above, the internal volume of the liquid chamber 29 decreases and the internal pressure increases as the liquid piston 23 moves down, so that the liquid in the liquid chamber 29 is mixed via the second check valve 41. 17 is pushed out. By the same principle, the internal volume of the air chamber 28 is reduced and the internal pressure thereof is increased. Due to the internal pressure, the outer valve portion 21 of the molding valve 16 closes the second vent hole 15, thereby blocking the air chamber 28 from the outside of the container. On the other hand, the inner valve portion 22 of the molding valve 16 is opened by the internal pressure, and the air in the air chamber 28 is pushed out to the mixing chamber 17 through the second air passage 25. In the mixing chamber 17, liquid and air are mixed to form bubbles. The bubbles are homogenized by passing through the net holder 19, and then flow through the discharge passage of the nozzle portion 5 and are discharged from the discharge port 6. Further, the first vent hole 13 is opened, and outside air is introduced into the container through the first air passage 9 and the first vent hole 13.

  When the nozzle portion 5 is further pushed down, the annular protrusion 27 formed on the outer peripheral surface of the liquid piston 23 comes into contact with the upper end portion of the liquid cylinder portion 11. As a result, the lowering of the nozzle portion 5 and the pistons 14 and 23 and the inner rod 31 is stopped. FIG. 8 shows this state.

  When the pressing force on the nozzle portion 5 is released, the nozzle portion 5 and the pistons 14 and 23 are pushed up toward the upper limit position shown in FIG. When the liquid piston 23 is pushed up, the inclined surface 40 of the large-diameter portion 39 of the inner rod 31 is engaged with the second valve seat portion 24 formed at one end thereof. As a result, the second check valve 41 is closed. Further, the inner rod 31 is pulled up. In this way, the inner rod 31 rises slightly after the rise of the liquid piston 23. Since the sliding portion 38 of the inner rod 31 is in contact with the inner peripheral surface of the body portion 43 of the plug 32 while maintaining a liquid-tight state, the plug 32 is also lifted by the inner rod 31, and the first check valve 47. Is open. When the plug 32 is lifted in this way, the protrusion 34 formed on the outer peripheral surface of the plug 32 comes into contact with the other end of the spring 30. Thereby, the raising of the plug 32 is stopped. On the other hand, the inner rod 31 continues to rise together with the pistons 14 and 23.

  As the liquid piston 23 rises, the internal volume of the liquid chamber 29 increases, and its internal pressure decreases below the internal pressure of the container. Due to the low internal pressure of the liquid chamber 29, the liquid in the container is sucked into the liquid chamber 29 via the liquid guide tube. In this case, the low internal pressure of the liquid chamber 29 described above acts on the sliding portion 38 so as to reduce its outer diameter. As a result, the adhesion between the sliding portion 38 and the inner peripheral surface of the body portion 43 of the plug 32 is lowered. When the inner rod 31 is further raised, the sliding portion 38 is fitted in the annular groove portion 45 while maintaining a liquid-tight state. Similar to the liquid chamber 29 described above, the internal volume of the air chamber 28 increases, and its internal pressure decreases below the pressure outside the container. Due to the low internal pressure of the air chamber 28, the outer valve portion 21 of the molding valve 16 is separated from the second vent hole 15 to open the second vent hole 15, and as a result, the air chamber 28 communicates with the outside of the container. Further, the inner valve portion 22 is attracted to the annular protrusion 27 side, and the communication state between the air chamber 28 and the mixing chamber 17 is blocked. When the nozzle portion 5 rises to the upper limit position shown in FIG. 1, the first vent hole 13 is blocked by the lower end portion of the air piston 14. Thereby, the inside of the container is closed with respect to the outside.

  According to the pump dispenser 1 configured as described above, the internal pressure of the liquid chamber 29 that increases as the liquid piston 23 descends acts on the sliding portion 38 so as to increase the outer diameter thereof. Therefore, even if the pump dispenser 1 is used repeatedly, the adhesion between the inner rod 31 and the plug 32 can be ensured. Thereby, the taper surface 46 of the plug 32 can be reliably approached and separated from the first valve seat portion 36. That is, even if the pump dispenser 1 is repeatedly used, it is possible to suppress the function of the first check valve 47 from being hindered. Further, the inner peripheral surface of the sliding portion 38 and the body portion 43 is mainly used to increase the frictional force or adhesion force between the inner rod 31 and the plug 32 when the nozzle portion 5 is pushed down and to reduce the adhesion force when it is raised. Can suppress wear. As a result, the function as a pump can be maintained, and the highly durable pump dispenser 1 can be obtained.

  Although the present invention has been described by taking as an example a so-called pump former that discharges the liquid filled in the container as bubbles, it is configured to discharge the liquid filled in the container as it is instead. It can also be applied to the pump dispenser 1 made.

  DESCRIPTION OF SYMBOLS 1 ... Pump dispenser, 2 ... Cap, 5 ... Nozzle part, 11 ... Liquid cylinder part, 23 ... Liquid piston, 31 ... Inner rod, 32 ... Plug, 35 ... Communication port, 38 ... Sliding part.

Claims (2)

A liquid cylinder part formed in communication with the container inside a cap attached to the mouth part of the container; a liquid piston fitted to the liquid cylinder part so as to increase or decrease the internal volume of the liquid cylinder part; A cylindrical plug that is abutted from the inside of the liquid cylinder portion to the communication port that allows the container and the liquid cylinder portion to communicate with each other, and a front end portion is inserted into the plug, and a rear end portion is Formed by an inner rod penetrated by the liquid piston, a penetrating portion of the liquid piston through which a rear end portion of the inner rod penetrates, and a rear end portion of the inner rod, the liquid piston can move up and down on the cap In a pump dispenser comprising an outflow valve portion that is opened by being pushed down by a nozzle portion attached to
The inner peripheral surface of the plug is slidably in contact with the inner peripheral surface, and the inner pressure of the liquid cylinder portion increased by pushing down the liquid piston by the nozzle portion acts to increase the outer diameter. A pump dispenser, wherein an umbrella-shaped sliding portion is formed on the inner rod.   2. The pump dispenser according to claim 1, wherein a groove portion into which the outer peripheral edge of the sliding portion is fitted is formed on the inner peripheral surface of the plug over the entire periphery of the inner peripheral surface of the plug. .

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