JP6116269B2 - Foam dispenser - Google Patents

Description

  The present invention relates to a foam dispenser.

  As a discharger, it has a stem erected so as to be able to move downward in an upwardly biased state at the mouth of a container body containing liquid, and a push-down head disposed at the upper end of the stem and having a nozzle hole formed 2. Description of the Related Art Conventionally, a foam discharger that includes a pump and a mounting cap that mounts the pump on the mouth of a container body is known. In such a foam discharger, a liquid piston that is linked to the stem and a liquid piston that is slidably moved up and down are accommodated in a pump that foams and discharges the liquid in the container body from the nozzle hole. A cylinder, an air piston linked to the stem, an air cylinder in which the air piston is housed slidably up and down, a liquid from the liquid cylinder, and a liquid by mixing the air from the air cylinder And a gas-liquid mixing part for foaming (see, for example, Patent Document 1).

JP 2009-202122 A

  However, in the conventional foam discharger, for example, in order to suppress the occurrence of liquid leakage, reduce the amount of resin used, reduce the required pressing force, etc., the container body with a small diameter mouth If it is going to be attached to the air cylinder, the air cylinder normally disposed in the container body must be made small, and the amount of air supplied from the air cylinder to the gas-liquid mixing section becomes insufficient, and the desired foam There was a possibility that the quality could not be discharged.

  The present invention has been made in view of the actual situation, and a foam dispenser capable of sufficiently securing the amount of air supplied to the gas-liquid mixing unit even when attached to a container body having a small mouth diameter. The purpose is to provide.

As a means for solving the above problems, the present invention provides a stem that is erected in an upwardly biased state at the mouth of a container body that contains liquid, and a nozzle hole that is disposed at the upper end of the stem. A foam dispenser comprising a formed pump having a pressing head and a mounting cap for mounting the pump on the mouth of the container body, and foaming and discharging 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, and the air An air cylinder in which a piston is housed slidably up and down, and a gas-liquid mixing unit that mixes the liquid from the liquid cylinder and the air from the air cylinder to foam the liquid. Provided, said The pneumatic cylinder is disposed inside the mounting cap and accommodated in the container main body, and a piston cylinder portion erected on the top wall portion of the mounting cap is slidable up and down on the pressing head. A head-side air cylinder to be fitted is extended, and the head-side air cylinder surrounds the mounting cylinder part into which the stem is fitted, and the mounting cylinder part from the outside in the radial direction. an outer cylinder section which is provided between the, in the pump, the communicating passage communicating the head-side air cylinder and the air cylinder is formed, a portion of the communication passage, the It is provided between the mounting cylinder part and the cylinder that extends downward from the head-side air cylinder and surrounds the mounting cylinder part from the outside in the radial direction .

In the present invention, the pump includes not only the air cylinder accommodated in the container main body but also the head side air cylinder positioned outside the container main body. Not only the air in the cylinder but also the air in the head-side air cylinder can be supplied into the gas-liquid mixing section through the communication path.
Therefore, even if the air cylinder accommodated in the container main body is made smaller than the current size and the internal volume is reduced, the head-side air cylinder located outside the container main body reduces the internal volume of the air cylinder. You can make up for the minute. Thereby, even when it mounts | wears with a container main body with a small diameter of an opening | mouth part, the air quantity supplied to a gas-liquid mixing part can fully be ensured.

  The pump is formed with a through hole capable of supplying outside air to the air cylinder, the head side air cylinder, and the communication passage, and the through hole is formed before the pressing head is pressed. In the standby state, and when the pressing head is pressed, the members constituting the pump may be closed by contacting each other.

In this case, when the pressing head is pressed down, the members constituting the pump come into contact with each other to close the through hole, and the air in the air cylinder and the head side air cylinder are compressed to mix the gas and liquid. Supplied to the department. When the pressing of the pressing head is released, the members constituting the pump are restored and moved to the standby position so that the through hole is opened and the outside air is supplied into the air cylinder and the head side air cylinder. .
Therefore, when the pressing head is pressed, there is no need to provide a separate valve element that opens and closes the through hole by elastic deformation due to the negative pressure generated in the air cylinder, the head side air cylinder, and the communication passage. It is possible to supply air to the gas-liquid mixing section and to supply outside air into the air cylinder and the head-side air cylinder when releasing the press, for example, reducing the number of parts and simplifying the structure. Can be achieved.

  According to the present invention, it is possible to ensure a sufficient amount of air supplied to the gas-liquid mixing section even when the container is mounted on a container body having a small diameter.

It is a longitudinal cross-sectional view of the foam dispenser which concerns on the 1st Embodiment of this invention. It is an enlarged view of FIG. It is a figure explaining the effect | action of the foam discharger which concerns on the 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the foam discharger which concerns on the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the foam discharger concerning the 2nd Embodiment of this invention, and is a longitudinal cross-sectional view of the state which pressed down the pressing head. It is a longitudinal cross-sectional view of the foam discharger which concerns on the 3rd Embodiment of this invention. It is a longitudinal cross-sectional view of the foam discharger concerning the 3rd Embodiment of this invention, and is a longitudinal cross-sectional view of the state which pressed down the pressing head. It is a longitudinal cross-sectional view of the foam dispenser which concerns on the 4th Embodiment of this invention. It is a longitudinal cross-sectional view of the foam discharger concerning the 4th Embodiment of this invention, and is a longitudinal cross-sectional view of the state which pushed down the pressing head.

Embodiments of the present invention will be described below with reference to the drawings.
<First Embodiment>
FIG. 1 shows a discharge container in which a foam discharger 10 according to a first embodiment of the present invention is mounted on a mouth 2 of a container body 1. In the drawing, O indicates an axis passing through the center of the cross section of the container main body 1 (hereinafter, container axis O). Hereinafter, the mouth 2 side along the container axis O is the upper side, the opposite side is the lower side, and the direction along the container axis O is referred to as the vertical direction. Further, a direction orthogonal to the container axis O is referred to as a radial direction, and a circumferential direction of the container axis O is referred to as a circumferential direction.

  The foam discharger 10 includes a pump 11. The pump 11 is erected on the mouth portion 2 of the container body 1 so as to be movable downward in an upwardly biased state, and a nozzle hole disposed at the upper end portion of the stem 12. And a pressing head 14 having 13 formed thereon. The pump 11 is attached to the mouth 2 of the container body 1 so that the axis of the stem 12 is coaxial with the container axis O. The foam discharger 10 further includes a mounting cap 4 that mounts the pump 11 on the mouth 2 of the container body 1.

  In the illustrated example, the mounting cap 4 includes a ceiling wall portion 6 in which an insertion hole 5 is formed, a mounting peripheral wall portion 7 extending downward from an outer peripheral edge of the ceiling wall portion 6, and a ceiling wall portion 6. A piston cylinder 8 extending upward from the outer peripheral edge of the insertion hole 5, and is screwed to the outer peripheral surface of the mouth portion 2 of the container body 1 on the inner peripheral surface of the mounting peripheral wall portion 7. A screw portion 9 is formed.

  The pump 11 includes an air piston 16 linked to the stem 12, an air cylinder 17 in which the air piston 16 is housed slidably up and down, a liquid piston 18 linked to the stem 12, and a liquid A liquid cylinder 19 in which a piston 18 is slidably moved up and down, a liquid from the liquid cylinder 19 and an air from the air cylinder 17 are mixed to foam the liquid in the container body 1. And a liquid mixing unit M. The gas-liquid mixing unit M is disposed between the gas-liquid mixing chamber 20 where the air from the air cylinder 17 and the liquid from the liquid cylinder 19 merge, and the gas-liquid mixing chamber 20 and the nozzle hole 13. And a foaming member 21 for foaming the gas-liquid mixture mixed in the gas-liquid mixing chamber 20.

  The liquid cylinder 19 and the air cylinder 17 each have a cylindrical shape. In this embodiment, the liquid cylinder 19 and the air cylinder 17 are integrally formed, and the outer peripheral surface at the upper end opening of the air cylinder 17 is formed. The mounting cap 4 is in close contact with the inner surface of the mounting peripheral wall 7 and the top wall 6. And the pump 11 is being fixed to the opening part 2 because the outer peripheral surface in the upper end opening part of the cylinder 17 for air is pinched | interposed between the inner surface of the top wall part 6, and the upper end opening edge of the opening part 2.

The air cylinder 17 is formed in a bottomed cylindrical shape, and a cylindrical liquid cylinder 19 is connected to the bottom surface of the cylinder 17 in a state where the inside thereof and the inside of the air cylinder 17 communicate with each other.
That is, the small-diameter liquid cylinder 19 is continuously provided below the large-diameter air cylinder 17.

  The pressing head 14 extends downward and has a mounting cylinder portion 22 with the stem 12 fitted therein, and extends downward and surrounds the mounting cylinder portion 22 from the outside in the radial direction. And an outer cylinder portion 23. The upper end opening of the mounting cylinder 22 communicates with a base end opening formed at the base end of the nozzle cylinder 24 having the nozzle hole 13 formed at the tip. The base end opening of the nozzle cylinder 24 opens downward, and the mounting cylinder 22 and the nozzle cylinder 24 are connected to form an L shape in a longitudinal sectional view.

  The mounting cylinder portion 22 is inserted into the piston cylinder 8 provided in the mounting cap 4 so as to be movable up and down with a radial gap. Further, the inner diameter of the outer cylinder portion 23 is larger than the outer diameter of the piston cylinder 8, and when the pressing head 14 is pushed down, the piston cylinder 8 enters between the mounting cylinder portion 22 and the outer cylinder portion 23. It is like that.

  Here, in the present embodiment, the annular substrate portion that is externally fitted to the upper end portion of the mounting cylinder portion 22 and is fitted into the upper end portion of the outer cylinder portion 23 between the mounting cylinder portion 22 and the outer cylinder portion 23. A cylinder defining cylinder 53 is provided that includes 51 and a passage cylinder 52 that extends downward from the inner peripheral edge of the annular substrate 51 and is inserted inside the piston cylinder 8.

  The cylinder defining cylinder 53, together with the outer cylinder portion 23, defines a head-side air cylinder 54 into which the piston cylinder 8 is slidably fitted. In the present embodiment, the inner peripheral edge of the piston cylinder 8 is fitted to the passage cylinder part 52 so as to be slidable up and down, and the outer peripheral edge is fitted to the inner periphery of the outer cylinder part 23 so as to be slidable up and down. A piston member 55 is provided, and when the pressing head 14 moves up and down, the piston member 55 slides relatively up and down in the head side air cylinder 54.

  As shown in FIG. 2, the lower end of the passage cylinder 52 extends below the mounting cylinder 22 and abuts a part of the air piston 16. On the inner peripheral surface of the passage tube portion 52, a plurality of communication vertical grooves 56 extending substantially over the entire length in the vertical direction of the passage tube portion 52 and opening downward are formed at intervals in the circumferential direction. Further, a plurality of communication openings 57 are formed at the upper end of the passage cylinder portion 52 so as to penetrate the communication vertical grooves 56 and the inside of the head-side air cylinder 54 from the communication vertical grooves 56 to the outside in the radial direction. Has been.

  By the way, the foaming member 21 in the gas-liquid mixing part M is disposed in a substantially central region in the vertical direction in the mounting cylinder part 22. The upper end of the stem 12 is fitted to the lower end of the foam member 21.

  As shown in FIGS. 1 and 2, the foam member 21 includes a cylindrical casing 25 and two foam elements 26 mounted in the casing 25. The casing 25 has a two-stage cylindrical shape having a large-diameter portion on the upper side and a small-diameter portion on the lower side. The large-diameter portion is inserted and fixed inside the mounting cylinder portion 22, and the small-diameter portion is the upper end portion of the stem 12. It is fitted inside. A plurality of casing grooves 27 are formed on the outer peripheral surface of the small-diameter portion so as to extend upward from the lower end thereof to reach the bottom outer surface of the large-diameter portion, and further to open outward in the radial direction.

  Further, the foam element 26 has a structure in which a net is stretched on the cylindrical main body. Of the two foam elements 26 arranged in the casing 25, the lower one is positioned below the cylindrical main body. A net is stretched on the side opening surface, and a net is stretched on the upper opening surface of the cylindrical main body on the upper side.

  The stem 12 protrudes downward from the lower end opening edge of the mounting cylinder portion 22. A plurality of vertical grooves 28 extending in the vertical direction and opened downward are formed in a portion where the upper end portion of the stem 12 is fitted on the inner peripheral surface of the mounting cylinder portion 22. These longitudinal grooves 28 straddle the upper end opening edge of the stem 12 in the radial direction and communicate with a plurality of casing grooves 27 formed in the casing 25 of the foam member 21.

  The air piston 16 is disposed in the air cylinder 17 so as to be vertically slidable in an airtight state, and includes a multistage cylindrical outer cylinder 30 and an inner cylinder 31 disposed inside the outer cylinder 30. And a top plate portion 32 that connects the upper end portion of the outer cylinder 30 and the outer peripheral surface of the inner cylinder 31. Among these, a portion of the stem 12 connected to the lower portion of the upper end portion fitted to the mounting cylinder portion 22 is inserted inside the inner cylinder 31 so as to be vertically movable.

  Next, as shown in FIG. 2, the top plate portion 32 is integrally formed with an annular partition peripheral wall portion 33 that extends upward from the top surface of the top plate portion 32 and extends downward from the bottom surface. The upper end portion of 33 is fitted to the inner peripheral surface of the lower end portion of the passage cylinder portion 52 so as to be vertically slidable, and the lower end portion extends into the air cylinder 17. An air hole 34 penetrating in the vertical direction is formed in a portion of the top plate portion 32 that is located on the outer side in the radial direction of the partition peripheral wall portion 33. A merge hole 35 penetrating in the vertical direction is formed in the position. A valve body 36 that opens and closes the air hole 34 is fitted to the outer peripheral surface of the lower end portion of the partition peripheral wall portion 33.

  On the other hand, an upper slidable contact portion 37 that is slidably fitted to the inner peripheral surface of the lower end side of the mounting cylinder portion 22 is formed on the upper end edge of the inner cylinder 31 over the entire circumference of the inner cylinder 31. Further, an annular lower sliding contact portion 38 is formed at the lower end portion of the outer cylinder 30 so as to be slidably fitted to the inner surface of the air cylinder 17.

  Here, a vertical gap S <b> 1 is provided between the upper edge of the upper sliding contact portion 37 and the inner surface of the mounting cylinder portion 22. A gap is provided between the lower end of the mounting cylinder portion 22 and the top plate portion 32.

  A vertical groove 28 formed in the inner peripheral surface of the mounting cylinder portion 22 is opened in the gap S1. Here, on the outer peripheral surface of the stem 12, a plurality of stem grooves 39 extending in the vertical direction and opening to the gap S <b> 1 are formed in the portion of the air piston 16 where the inner cylinder 31 is disposed. ing. The stem groove 39 opens in the gap S1. Here, the air cylinder 17 and the gas-liquid mixing chamber 20 are connected by the stem groove 39, the longitudinal groove 28 formed in the mounting cylinder portion 22, the casing groove 27 formed in the casing 25 of the foaming member 21, and the gap S1. An air passage R1 that communicates is configured.

  A vertical gap S <b> 2 is provided between the inner cylinder 31 and the partition peripheral wall portion 33 in the air piston 16 and between the top plate portion 32 and the lower end of the mounting cylinder portion 22. In the gap S2, the lower end of the communication longitudinal groove 56 formed in the cylinder defining cylinder 53 is opened, and the junction hole 35 formed in the top plate portion 32 is opened. Here, the communication vertical path 56 that connects the inside of the head side air cylinder 54 and the inside of the air cylinder 17 by the communication vertical groove 56, the communication opening 57 that communicates with the upper end of the communication vertical groove 56, the junction hole 35, and the gap S <b> 2 Is configured.

  On the other hand, as shown in FIG. 1, the liquid piston 18 disposed in the liquid cylinder 19 and sliding up and down is a small-diameter cylinder whose upper end is inserted and fixed in a liquid-tight state inside the stem 12. The lower end side protrudes downward from the lower end opening edge of the stem 12, and the outer peripheral surface thereof is a large diameter cylindrical portion 41 that is substantially flush with the outer peripheral surface of the stem 12.

  Inside the liquid piston 18 and the liquid cylinder 19 is an upper valve body 42 whose upper end portion has a hollow inverted conical shape, and a lower end portion which can be seated and separated from the lower end opening in the liquid cylinder 19. A rod-shaped valve member 44 which is the valve body 43 is provided.

  The upper valve body 42 is a valve that switches communication between the liquid cylinder 19 and the upper end portion of the stem 12 and the blocking thereof. Here, reference numeral 45 in the drawing indicates a coil spring disposed between the liquid piston 18 and the inner surface of the lower end of the liquid cylinder 19. The coil spring 45 has a large diameter for the liquid piston 18. The cylinder portion 41 is supported so as to be movable downward from below the cylinder portion 41 in an upward biased state.

  Here, on the inner peripheral surface of the stem 12, an annular valve seat 46 protrudes radially inward from a portion located between the liquid piston 18 and the foaming member 21. A spherical liquid discharge valve 47 is provided on the valve seat 46 so as to be seated and separated. In the stem 12, the space between the lower end of the small diameter portion of the foam member 21 and the upper surface of the valve seat 46 is the gas-liquid mixing chamber 20.

  Further, on the outer peripheral surface of the stem 12, it projects outward in the radial direction at the portion where the lower ends of the plurality of stem grooves 39 are located, and the lower end of the inner cylinder 31 of the air piston 16 is extended to the lower end of the inner cylinder 31. A flange portion 48 that abuts from below is formed. The flange portion 48 is formed integrally with the stem 12, and the lower end of the inner cylinder 31 of the air piston 16 contacts the flange portion 48 in a standby state before the pressing head 14 is pressed.

  As shown in FIGS. 1 and 2, in the foam discharger 10 as described above, in the standby state before the pressing head 14 is pressed, the flange portion 48 of the stem 12 is connected to the inner cylinder 31 of the air piston 16. A vertical gap S1 is provided between the inner surface of the mounting cylinder portion 22 of the pressing head 14 and the upper edge of the upper sliding contact portion 37 of the inner cylinder 31, and the lower end of the mounting cylinder portion 22 A gap S <b> 2 is provided between the top plate portion 32.

When the pressing head 14 is pushed down from this state, the mounting cylinder portion 22 is lowered, and the foam member 21, the stem 12, and the liquid piston 18 are also moved downward while the coil spring 45 is compressed and deformed in the vertical direction. At this time, the air piston 16 is inserted through the inner cylinder 31 of the stem 12 so as to be movable up and down through a portion below the upper end portion fitted to the mounting cylinder portion 22. It does not move when the pressing head 14 is pushed down by a predetermined amount of movement in the initial stage, and a gap is formed between the lower end of the inner cylinder 31 of the air piston 16 and the flange portion 48 of the stem 12. Further, the clearance S1 between the upper end edge of the inner cylinder 31 and the inner surface of the mounting cylinder part 22 in the air piston 16 is reduced, and the clearance S2 is reduced between the lower end of the installation cylinder part 22 and the top plate part 32. Become.
Thereby, the inside of the air cylinder 17 and the gas-liquid mixing chamber 20 through the air passage R1 communicate with each other, and the inside of the head side air cylinder 54 passes through the communication passage R2, the air cylinder 17 and the air passage R1. It communicates with the gas-liquid mixing chamber 20.
Further, as the liquid piston 18 moves downward, the lower valve body 43 is also moved downward. The lower valve body 43 is seated and closed at the lower end opening of the liquid cylinder 19, and the liquid piston 18 is closed. Of the valve member 44 is separated downward from the upper valve body 42 of the valve member 44, and the liquid cylinder 19 and the stem 12 communicate with each other.

When the pressing head 14 is further pushed down, the gap S1 is further reduced, and the upper end edge of the inner cylinder 31 and the inner surface of the mounting cylinder part 22 come close to or come into contact with each other. By moving downward with the hole 34 closed, the air in the lower chamber located below the air piston 16 in the air cylinder 17 is compressed.
As a result, as indicated by an arrow X in FIG. 3, the air in the lower chamber in the air cylinder 17 flows from the gap between the lower end of the inner cylinder 31 and the flange portion 48 of the stem 12 in the air piston 16. It flows into the air passage R1 and is transferred to the gas-liquid mixing chamber 20.
At the same time, the piston cylinder 8 of the mounting cap 4 enters relatively upward into the head-side air cylinder 54 of the push-down head 14, and the piston member 55 at the upper end thereof is the head-side air cylinder. The air in the upper chamber located above the piston member 55 in the head-side air cylinder 54 is compressed. In this case, although the lower end of the mounting cylinder portion 22 and the top plate portion 32 are close to each other, the communication between the communication vertical groove 56 and the junction hole 35 through the gap S2 is maintained.
Thereby, as indicated by an arrow Y in FIG. 3, the air in the upper chamber in the head side air cylinder 54 passes through the communication path R <b> 2 and the air cylinder 17, and the lower end of the inner cylinder 31 in the air piston 16. And the flange 48 of the stem 12 flows into the air passage R <b> 1 from the gap between the flange portion 48 and the stem 12 and is transferred to the gas-liquid mixing chamber 20.

  Further, at this time, since the lower piston 43 of the valve member 44 closes the lower end opening of the liquid cylinder 19, the liquid piston 18 moves downward, so that the liquid in the liquid cylinder 19 rises and the stem 12. Reach inside. Then, the liquid pressure in the liquid cylinder 19 is applied to the liquid discharge valve 47 seated on the valve seat 46 of the stem 12 to separate the liquid discharge valve 47 from the valve seat 46, whereby the liquid cylinder 19 The liquid inside is transferred into the gas-liquid mixing chamber 20.

  As described above, after the liquid and air are merged in the gas-liquid mixing chamber 20 and passed through the foaming member 21, the liquid is foamed, and then the foamed liquid (gas-liquid mixing is passed through the nozzle hole 13 of the pressing head 14. The body (foam) is discharged.

  When the pressing of the pressing head 14 is released, the pressing head 14, the stem 12, the air piston 16 and the liquid piston 18 linked to the stem 12 are returned to the upward biased state by the elastic restoring force of the coil spring 45. become. More specifically, when the stem 12 is raised, the lower end portion of the inner cylinder 31 of the air piston 16 abuts (sits) the flange portion 48, and the air piston 16 rises together with the stem 12.

As described above, in the foam discharger 10 according to the embodiment of the present invention, the pump 11 includes not only the air cylinder 17 accommodated in the container body 1 but also the head side air located outside the container body 1. In addition, when the push-down head 14 is pushed down, not only the air in the air cylinder 17 but also the air in the head-side air cylinder 54 passes through the communication path R2 when the pressing head 14 is pushed down. Will be supplied inside.
Therefore, even if the air cylinder 17 accommodated in the container main body 1 is made smaller than its current size and its internal volume is reduced, the head-side air cylinder 54 located outside the container main body 1 is used for the air cylinder 17. It is possible to compensate for the decrease in the internal volume of the.
Thereby, even when it mounts | wears with the container main body 1 with the small diameter of the opening part 2, the air quantity supplied to the gas-liquid mixing part M can fully be ensured.

<Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIGS. In addition, about the component same as 1st Embodiment in 2nd Embodiment, it shows with the same code | symbol and abbreviate | omits description.

As shown in FIG. 5, in the foam discharger 10 ′ of the present embodiment, the air hole 34 described in the first embodiment is not formed in the top plate portion 32 of the air piston 16, and the valve body is formed. 36 is not provided. On the other hand, a through hole 58 communicating with the outside is formed between the passage cylinder portion 52 and the air piston 16 in a standby state before the pressing head 14 is pushed down. Specifically, in the standby state, the upper end portion of the partition peripheral wall portion 33 is separated from the inner peripheral surface of the lower end portion of the passage cylinder portion 52 to form the through hole 58, and the gap S2 is directed outward in the radial direction. The air piston 16 communicates with the space between the mounting cap 4. In other words, the communication passage R2 constituted by the communication vertical groove 56, the communication opening 57 connected to the upper end of the communication vertical groove 56, the merging hole 35, and the gap S2 is located at the gap S2, the merging hole 35 side, and the air piston. A branched state is formed inside the space between 16 and the mounting cap 4.
In this embodiment, when the pressing head 14 is pushed down by a predetermined amount, the upper end portion of the partition peripheral wall portion 33 is fitted to the inner peripheral surface of the lower end portion of the passage cylinder portion 52 to close the through hole 58, Communication of the clearance S2 into the space between the air piston 16 and the mounting cap 4 is blocked. In this case, the communication path R2 does not branch into the space between the air piston 16 and the mounting cap 4 at the position of the gap S2, and communicates the head side air cylinder 54 and the air cylinder 17 in an airtight manner. It will be in a state to be In addition, the lower end portion of the passage cylinder portion 52 is gradually increased in thickness in the radial direction toward the lower side so that the upper end portion of the partition peripheral wall portion 33 is easily inserted into the inner peripheral surface when the pressing head 14 is pushed down. Is formed in an inclined shape that decreases from the inner side to the outer side in the radial direction.

  In such a foam discharger 10 ′ of the present embodiment, as shown in FIG. 4, in the standby state before the pressing head 14 is pressed, the inner cylinder 31 of the air piston 16 is placed on the flange portion 48 of the stem 12. And a gap S1 in the vertical direction is provided between the inner surface of the mounting cylinder portion 22 of the pressing head 14 and the upper edge of the upper sliding contact portion 37 of the inner cylinder 31, and the lower end of the mounting cylinder portion 22 A gap S2 is provided between the air piston 16 and the top plate portion 32. The gap S2 communicates with the space between the air piston 16 and the mounting cap 4 through the through hole 58 toward the outside in the radial direction. Yes.

When the pressing head 14 is pushed down from this state, the mounting cylinder 22 is lowered, and the foam member 21, the stem 12, and the liquid piston 18 are also lowered while the coil spring 45 (see FIG. 1) is compressed and deformed in the vertical direction. Moved. At this time, the air piston 16 is inserted through the inner cylinder 31 of the stem 12 so as to be movable up and down through a portion below the upper end portion fitted to the mounting cylinder portion 22. It does not move when the pressing head 14 is pushed down by a predetermined amount of movement in the initial stage, and a gap is formed between the lower end of the inner cylinder 31 of the air piston 16 and the flange portion 48 of the stem 12.
Further, the clearance S1 between the upper end edge of the inner cylinder 31 and the inner surface of the mounting cylinder part 22 in the air piston 16 is reduced, and the clearance S2 between the lower end of the installation cylinder part 22 and the top plate part 32 is reduced. Become. In the process of pushing down the pressing head 14, the upper end portion of the partition peripheral wall portion 33 is fitted to the inner peripheral surface of the lower end portion of the passage cylinder portion 52, the through hole 58 is closed, and the air piston 16 in the gap S2 is closed. And communication between the mounting cap 4 and the mounting cap 4 are blocked. That is, the communication path R2 does not branch into the space between the air piston 16 and the mounting cap 4 at the position of the gap S2, but allows the head side air cylinder 54 and the air cylinder 17 to communicate in an airtight manner. It becomes a state.
Thereby, the inside of the air cylinder 17 and the gas-liquid mixing chamber 20 through the air passage R1 communicate with each other, and the inside of the head side air cylinder 54 passes through the communication passage R2, the air cylinder 17 and the air passage R1. It communicates with the gas-liquid mixing chamber 20.

When the pressing head 14 is further pushed down, the gap S1 is further reduced, and the upper end edge of the inner cylinder 31 and the inner surface of the mounting cylinder portion 22 come close to or contact each other, and the air piston 16 also closes the through hole 58. By being moved downward in this state, the air in the lower chamber located below the air piston 16 is compressed in the air cylinder 17.
As a result, as indicated by an arrow X in FIG. 5, the air in the lower chamber in the air cylinder 17 flows from the gap between the lower end of the inner cylinder 31 and the flange portion 48 of the stem 12 in the air piston 16. It flows into the air passage R1 and is transferred to the gas-liquid mixing chamber 20. In FIG. 5, the upper end portion of the partition peripheral wall portion 33 is fitted to the inner peripheral surface of the lower end portion of the passage cylinder portion 52, and enters the space between the air piston 16 and the mounting cap 4 in the gap S <b> 2. The state where the communication of is cut off is shown.
At the same time, the piston cylinder 8 of the mounting cap 4 enters relatively upward into the head-side air cylinder 54 of the push-down head 14, and the piston member 55 at the upper end thereof is the head-side air cylinder. The air in the upper chamber located above the piston member 55 in the head-side air cylinder 54 is compressed. In this case, although the lower end of the mounting cylinder portion 22 and the top plate portion 32 are close to each other, the communication between the communication vertical groove 56 and the junction hole 35 through the gap S2 is maintained.
As a result, as indicated by an arrow Y in FIG. 5, the air in the upper chamber in the head side air cylinder 54 passes through the communication path R <b> 2 and the air cylinder 17, and the lower end of the inner cylinder 31 in the air piston 16. And the flange 48 of the stem 12 flows into the air passage R <b> 1 from the gap between the flange portion 48 and the stem 12 and is transferred to the gas-liquid mixing chamber 20.

On the other hand, when the pressing of the pressing head 14 is released, the pressing head 14, the stem 12, the air piston 16 and the liquid piston 18 linked to the stem 12 return to the upward biased state by the elastic restoring force of the coil spring 45. It will be. More specifically, when the stem 12 is raised, the lower end portion of the inner cylinder 31 of the air piston 16 abuts (sits) the flange portion 48, and the air piston 16 rises together with the stem 12.
In this case, as shown in FIG. 4, the gap S <b> 1 and the gap S <b> 2 become larger, and the gap S <b> 2 is directed between the air piston 16 and the mounting cap 4 toward the outside in the radial direction through the through hole 58. It will be in the state which communicates in the space. Further, the lower chamber located below the air piston 16 in the air cylinder 17 expands to become negative pressure.
Accordingly, as shown by an arrow Z in FIG. 4, the clearance S <b> 2 and the merge hole 35 are formed from the through hole 58 between the upper end portion of the partition peripheral wall portion 33 and the inner peripheral surface of the lower end portion of the passage cylinder portion 52. Then, outside air flows into the air cylinder 17, and outside air flows into the head side air cylinder 54 from the through hole 58 through the gap S 2, the communication vertical groove 56 and the communication opening 57.

In the foam discharger 10 ′ according to the second embodiment, when the pressing of the pressing head 14 is released without using the air hole 34 and the valve body 36 as described in the first embodiment, the air is discharged. Since the outside air can flow into the cylinder 17 for the head and the cylinder 54 for the head side air, the structure can be simplified and the size can be reduced.
In the above embodiment, the upper end portion of the partition peripheral wall portion 33 is fitted to the inner peripheral surface of the lower end portion of the passage cylinder portion 52 to close the through hole 58, and is mounted on the air piston 16 in the gap S2. The timing at which the communication with the cap 4 in the space is blocked is before the air piston 16 is pushed down together with the depression of the push-down head 14, but may be after the depression. .

<Third Embodiment>
Next, a third embodiment of the present invention will be described with reference to FIGS. The foam dispenser 10 '' of the third embodiment has the same basic configuration as the foam dispenser 10 'of the second embodiment, but the shape of the lower end of the passage cylinder 52 is the same as that of the second embodiment. Different from the foam dispenser 10 '. Components in the third embodiment that are the same as those in the second embodiment are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 6, in the foam discharger 10 ″ of the present embodiment, a plurality of slits 80 extending upward from the lower end and penetrating in the radial direction are formed in the passage cylinder portion 52 over the entire circumferential direction. Yes.

  The slit 80 is formed so that the upper end portion of the partition peripheral wall portion 33 is fitted to the inner peripheral surface of the lower end portion of the passage cylinder portion 52 before the air piston 16 is pushed downward as the pressing head 14 is pushed down. As shown in FIG. 7, the upper end of the slit 80 is connected to the pressing head so that the hole 58 is closed and the communication between the air gap 16 and the space between the air piston 16 and the mounting cap 4 is blocked. 14 and the air piston 16 are positioned below the upper end of the partition wall 33 before the air piston 16 is pressed downward.

  In such a foam discharger 10 '' of the third embodiment, when the press of the pressing head 14 is released and the outside air flows into the air cylinder 17, the outside air is efficiently passed through the slit 80. 17 and the head-side air cylinder 54.

<Fourth Embodiment>
Next, a fourth embodiment of the present invention will be described with reference to FIGS. Note that the same components in the fourth embodiment as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 8, in the foam discharger 10 ′ ″ of the present embodiment, in the air piston 16, the partition peripheral wall portion 33 and the air hole described in the first to third embodiments are provided in the top plate portion 32. 34 is not formed. Further, the valve body 36 and the cylinder defining cylinder 53 are not provided.

  The foam discharger 10 ″ ″ includes a piston cylinder 61 disposed on the top wall 6 of the mounting cap 4. The piston cylinder portion 61 includes a piston cylinder 8 and a piston member 55. The piston cylinder 8 is erected on the inner peripheral edge of the top wall 6 of the mounting cap 4. A restriction member 63 for restricting the pressing of the pressing head 14 is detachably mounted on the piston cylinder 8. An annular support surface portion 8 a that protrudes inward in the radial direction is formed at the upper end portion of the piston cylinder 8. The upper surface of the support surface portion 8 a constitutes the upper end surface of the piston cylinder 8.

  The piston cylinder 8 is provided with a first engagement protrusion 64 and a first through hole 65. The first engagement protrusion 64 protrudes outward in the radial direction from the piston cylinder 8. The first engagement protrusion 64 is disposed in a portion of the piston cylinder 8 that is located below the support surface portion 8a. The first through hole 65 penetrates the piston cylinder 8 in the radial direction. The first through hole 65 is disposed in a portion of the piston cylinder 8 that is located below the first engagement protrusion 64.

  The piston member 55 is disposed so as to be freely contacted and separated from above with respect to the upper end surface of the piston cylinder 8. The piston member 55 includes an outer sliding cylinder 66, an inner sliding cylinder 67, and a connecting portion 68. The outer sliding cylinder 66 is externally mounted on the piston cylinder 8, and the inner sliding cylinder 67 is internally mounted on the piston cylinder 8. The connecting portion 68 connects the outer sliding cylinder 66 and the inner sliding cylinder 67.

  The outer sliding cylinder 66 is externally fitted to the upper end portion of the piston cylinder 8 so as to be slidable up and down. An upper end portion of the outer sliding cylinder 66 that protrudes upward from the support surface portion 8a is a tapered portion 66a that gradually increases in diameter as it goes upward.

  The outer sliding cylinder 66 is provided with a second through hole 69 and a second engagement protrusion 70. The second through hole 69 penetrates the outer sliding cylinder 66 in the radial direction. The second through hole 69 is disposed in a portion of the outer sliding cylinder 66 that is located below the tapered portion 66a. The second engaging protrusion 70 protrudes from the outer sliding cylinder 66 toward the inside in the radial direction. The second engagement protrusion 70 is disposed in a portion of the outer sliding cylinder 66 located below the second through hole 69. The second engagement protrusion 70 engages with the first engagement protrusion 64 from below the first engagement protrusion 64.

The lower end portion of the inner sliding cylinder 67 is positioned below the lower end portion of the outer sliding cylinder 66 and is positioned in the insertion hole 5. The inner sliding cylinder 67 defines an annular space 71 between the piston cylinder 8 and the inner sliding cylinder 67.
The connecting portion 68 is formed in an annular plate shape whose front and back surfaces are directed in the vertical direction, and connects the upper end portions of the outer sliding cylinder 66 and the inner sliding cylinder 67 to each other. The connecting portion 68 faces the upper end surface of the piston cylinder 8 in the vertical direction, and comes into contact with and separates from the upper end surface from above. The connecting portion 68 is formed with a through hole 72 that passes through the connecting portion 68 in the vertical direction.

  In the present embodiment, the guide cylinder portion 73 inserted into the annular space 71 is erected on the air piston 16. A seal projection 74 is provided on the inner peripheral surface of the guide tube portion 73. The seal protrusion 74 is formed in an annular shape extending continuously over the entire circumference in the circumferential direction. The seal protrusion 74 is externally fitted to the inner sliding cylinder 67 so as to be vertically slidable, and is in airtight contact with the outer peripheral surface of the inner sliding cylinder 67. A confluence hole 35 is opened in the guide cylinder portion 73.

  Furthermore, in this embodiment, the mounting cylinder part 22 is formed separately from the pressing head 14, and the fitting cylinder part 75 is formed integrally with the pressing head 14. The fitting cylinder portion 75 extends downward from the proximal end opening of the nozzle cylinder portion 24. The casing 25 is fitted in the upper part of the fitting cylinder part 75, and the casing 25 is located immediately below the proximal end opening of the nozzle cylinder part 24.

  The mounting cylinder part 22 is fitted in the lower part of the fitting cylinder part 75 and communicates with the proximal end opening of the nozzle cylinder part 24 through the casing 25. The mounting cylinder portion 22 is formed integrally with the casing 25, and the upper end portion of the mounting cylinder portion 22 is connected to a connection portion between the large diameter portion and the small diameter portion of the casing 25. The mounting cylinder part 22 protrudes downward from the fitting cylinder part 75, and a part protruding downward from the fitting cylinder part 75 between the fitting cylinder part 75 and the inner sliding cylinder 67 and in the mounting cylinder part 22. A communication gap 76 that opens in the vertical direction is provided between the inner sliding cylinder 67 and the inner sliding cylinder 67.

  In the foam discharger 10 ′ ″ as described above, the head side air cylinder 54 is annularly defined between the outer cylinder portion 23 and the fitting cylinder portion 75. The clearance S2 is between the inner cylinder 31 and the guide cylinder part 73 of the air piston 16 and between the top plate part 32 and the lower end of the mounting cylinder part 22 and the lower end of the inner sliding cylinder 67. It is made. The communication path R2 includes a communication gap 76, a gap S2, and a merging hole 35.

  In the head side air cylinder 54, a piston cylinder part 61 is fitted so as to be slidable up and down. In this embodiment, the taper part 66a of the piston member 55 of the piston cylinder part 61 is an outer cylinder part. 23 is slidably fitted up and down. The tapered portion 66 a is in airtight contact with the inner peripheral surface of the outer cylinder portion 23. In such a foam discharger 10 ′ ″, the through-hole 72 provided in the connecting portion 68 is provided in a member that defines the air cylinder 17, the head-side air cylinder 54, and the communication path R2. It will be.

  In the foam discharger 10 ′ ″, as shown in FIG. 8, the first engagement protrusion 64 and the second engagement protrusion 70 are engaged in the standby state before the pressing head 14 is pressed. The connecting portion 68 is separated upward from the upper end surface of the piston cylinder 8 to open the through hole 72. The through-hole 72 communicates with the first through-hole 65 through between the connecting portion 68 and the piston cylinder 8, and the through-hole 72 and the first through-hole 65 are formed inside and outside the head-side air cylinder 54. And an introduction path 77 that communicates with each other.

  When the regulating member 63 is detached from this state and the pressing head 14 is pushed down against the elastic force of the coil spring 45 (see FIG. 1), the vertical position of the air piston 16 is shown in FIG. Are maintained at the same level, the mounting cylinder portion 22 and the stem 12 are lowered, and a gap is formed between the lower end of the inner cylinder 31 of the air piston 16 and the flange portion 48 of the stem 12. When the pressing head 14 is further pushed down, the upper end edge of the inner cylinder 31 and the inner surface of the mounting cylinder part 22 come close to or contact each other, and the air piston 16 moves down together with the stem 12.

  Further, at this time, the outer cylinder part 23 is also lowered by depressing the pressing head 14, and the piston member 55 is lowered together with the outer cylinder part 23 by a frictional force acting between the outer cylinder part 23 and the taper part 66a, for example. It is done. The piston member 55 moves down while sliding the seal projection 74 on the outer peripheral surface of the inner sliding cylinder 67 in an airtight manner. When the piston member 55 is lowered until the connecting portion 68 comes into contact with the upper end surface of the piston cylinder 8, the through hole 72 is closed by the upper end surface of the piston cylinder 8, and the inside of the head side air cylinder 54 passing through the introduction path 77. Communication with the outside is interrupted.

  When the communication between the inside of the head-side air cylinder 54 and the outside is cut off, if the push-down head 14 is further pushed down to lower the air piston 16, the air-side piston 17 is positioned below the air-use piston 16. The air in the lower chamber is compressed. Thereby, the air in the lower chamber flows into the air passage R <b> 1 from the gap between the lower end of the inner cylinder 31 and the flange portion 48 and is transferred to the gas-liquid mixing chamber 20.

  At this time, when the pressing head 14 is pushed down to lower the outer cylinder portion 23 and the piston member 55 is slid in the head side air cylinder 54, the piston member 55 is moved upward in the head side air cylinder 54. The air in the upper room located at is also compressed. As a result, the air in the upper chamber passes through the communication passage R2 and the air cylinder 17 and flows into the air passage R1 from the gap between the lower end of the inner cylinder 31 and the flange portion 48 and enters the gas-liquid mixing chamber 20. Be transported.

  The first through hole 65 and the second through hole 69 are in communication with each other in a state where the connecting portion 68 is in contact with the upper end surface of the piston cylinder 8, and is above the air piston 16 in the air cylinder 17. The space located at is communicated with the outside through the first through hole 65 and the second through hole 69. This space communicates with the inside of the container body 1 through a communication hole 78 formed in the air cylinder 17.

  When the pressing of the pressing head 14 is released, the stem 12 and the pressing head 14 are raised by the elastic restoring force of the coil spring 45, and the flange portion 48 of the stem 12 comes into contact with the lower end portion of the inner cylinder 31 of the air piston 16. The air piston 16 also rises. At this time, for example, the lower chamber and the upper chamber expand to become negative pressure, or a frictional force acts between the outer cylinder portion 23 and the tapered portion 66a, and the piston member 55 is also raised. . The piston member 55 is raised until the first engagement protrusion 64 and the second engagement protrusion 70 are engaged and restored to the standby position.

  Then, when the pressing head 14 and the air piston 16 rise together with the stem 12, as shown in FIG. 8, outside air flows into the head side air cylinder 54 through the introduction path 77, and the head side air cylinder. The outside air also flows into the air cylinder 17 through 54 and the communication path R2. As described above, the through-hole 72 is configured so that the air cylinder 17, the head-side air cylinder 54, and the members defining the communication path R <b> 2 move up and down in conjunction with the press head 14, thereby pressing the press head 14. It is sometimes opened and closed when the press is released.

  In such a foam discharger 10 ′ ″ of the fourth embodiment, when the pressing of the pressing head 14 is released without using the air hole 34 and the valve body 36 as described in the first embodiment. Since the outside air can flow into the air cylinder 17 and the head-side air cylinder 54, the structure can be simplified and downsized.

  As mentioned above, although embodiment of the foam discharger concerning this invention was described, this invention is not limited to above-described embodiment, In the range which does not deviate from the meaning, it can change suitably.

  For example, in the first to third embodiments, the piston member 55 is provided at the upper end portion of the piston tube 8 and these constitute the piston tube portion 61. It is good also as a structure fitted in the cylinder 54 for head side air. In the first to third embodiments, the configuration in which the head side air cylinder 54 is formed by the cylinder defining cylinder 53 and the outer cylinder portion 23 has been described. However, the mounting cylinder portion 22 and the outer cylinder portion are described. 23 may constitute a head-side air cylinder.

  In each of the above embodiments, the configuration in which the mounting cap 4 is screwed into the mouth portion 2 has been described. However, the mounting cap 4 may be attached to the mouth portion 2 by a stopper.

DESCRIPTION OF SYMBOLS 1 Container body 2 Mouth part 4 Mounting cap 6 Top wall part 8 Piston cylinder (piston cylinder part)
10, 10 ′, 10 ″, 10 ′ ″ Foam Discharger 11 Pump 12 Stem 13 Nozzle Hole 14 Pressing Head 16 Air Piston 17 Air Cylinder 18 Liquid Piston 19 Liquid Cylinder 20 Gas Liquid Mixing Chamber (Gas Liquid Mixing part)
21 Foam member (gas-liquid mixing part)
54 Head side air cylinder 55 Piston member (piston cylinder)
58, 72 Through-hole R2 Communication path M Gas-liquid mixing part

Claims (2)

A pump erected so as to be movable downward in an upwardly biased state at the mouth of the container body containing the liquid, and a pump having a pressing head disposed at the upper end of the stem and having a nozzle hole formed therein;
A mounting cap for mounting the pump on the mouth of the container body, and a foam discharger for foaming and discharging 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;
A gas-liquid mixing unit for mixing the liquid from the liquid cylinder and the air from the air cylinder to foam the liquid;
Is provided,
The air cylinder is disposed inside the mounting cap and accommodated in the container body,
The pressing head is extended with a head side air cylinder into which a piston cylinder portion erected on the top wall portion of the mounting cap is slidably fitted vertically,
The head-side air cylinder is provided between a mounting cylinder part in which the stem is fitted, and an outer cylinder part surrounding the mounting cylinder part from the outside in the radial direction,
The pump is formed with a communication path that communicates the inside of the head side air cylinder and the inside of the air cylinder ,
A part of the communication path is provided between the mounting cylinder part and a cylinder that extends downward from the head-side air cylinder and surrounds the mounting cylinder part from the outside in the radial direction. foam dispenser, characterized by being. The foam dispenser according to claim 1,
The pump is formed with through holes capable of supplying outside air into the air cylinder, the head-side air cylinder, and the communication path, respectively.
The bubble is opened in a standby state before pressing the pressing head, and closed when the members constituting the pump come into contact with each other when the pressing head is pressed. Dispenser.

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