JP6267998B2 - Foam dispenser - Google Patents

Description

  The present invention relates to a foam dispenser.

  Conventionally, for example, a foam dispenser shown in Patent Document 1 below is known. The foam discharger is disposed at the upper end of the stem, and has a pump that has a stem that is erected in an upwardly biased state at the mouth of the container body that contains the content liquid. And a pressing head. The pump includes a liquid piston and air piston linked to a stem, a liquid cylinder in which the liquid piston is housed slidably in the vertical direction, and an air in which the air piston is slidably housed in the vertical direction. And a gas-liquid mixing chamber for mixing the liquid content from the liquid cylinder and the air from the air cylinder.

JP 2001-19014 A

  However, in the conventional foam discharger, the pump is provided with a flow path for introducing outside air as air into the air cylinder, from which liquid such as water outside the container body is used for air. There is a risk of unintentional flow into the cylinder.

  The present invention has been made in view of the above-described circumstances, and suppresses the liquid outside the container body from unintentionally flowing into the air cylinder and unintentionally flows into the air cylinder. The purpose is to discharge liquids such as water and liquid contents during use.

In order to solve the above problems, the present invention proposes the following means.
The foam discharger according to the present invention includes a pump having a stem erected so as to be movable downward in an upwardly biased state at a mouth portion of a container body in which a content liquid is stored, and a nozzle disposed at an upper end portion of the stem. A pressing head having a hole formed therein, and the pump includes a liquid piston and an air piston linked to the stem, and a liquid cylinder in which the liquid piston is housed slidably up and down. Foam discharge comprising: an air cylinder in which the piston for air is slidably housed in an interior; and a gas-liquid mixing chamber for mixing the content liquid from the liquid cylinder and the air from the air cylinder. The air cylinder is formed in a bottomed cylindrical shape accommodated in the container body, and the liquid cylinder extends downward from a bottom portion of the air cylinder, and the air cylinder At the bottom of An air introduction hole for introducing air into the air cylinder, and gradually extending downward from the outside in the radial direction toward the inside, with the radially inner end at the upper end opening of the liquid cylinder The stem extends upward from the liquid piston, and the air piston includes an insertion tube portion through which the stem is vertically movable, and the pump Comprises an air passage for guiding the air in the air cylinder to the gas-liquid mixing chamber, and at least a part of the air passage is formed between the stem and the insertion tube portion, Protruding outward from the stem in the radial direction, abutting the lower end of the insertion tube portion, provided a contact portion for blocking communication between the gas-liquid mixing chamber and the air cylinder through the air passage, the abutting portion, the stem In a state before the is lowered moved, it positioned higher than the liquid cylinder, when the stem has been moved downward movement, the insertion tube while moving in the solution for a cylinder from above the liquid cylinder It is spaced apart from the lower end of a part, It is arrange | positioned in the said liquid cylinder in the state which connected the said gas-liquid mixing chamber and the inside of the said air cylinder which let the said air passage pass.

  In this case, since the air introduction hole is provided at the bottom of the air cylinder, it is possible to make it difficult for the liquid outside the container body to reach the air introduction hole. Unintentional inflow into the air cylinder through the air introduction hole can be suppressed.

By the way, in this foam discharger, when air is introduced into the air cylinder from the air introduction hole, the content liquid in the container body may flow into the air cylinder together with the air. Thus, the content liquid that has flowed into the air cylinder reaches the guide surface at the bottom of the air cylinder and flows along the guide surface toward the upper end opening of the liquid cylinder.
Here, when the pressing head is pushed down and the stem is moved downward, the liquid piston and the air piston are linked to the stem, the pump is operated, and the liquid in the liquid cylinder and the air in the air cylinder are operated. Are led to the gas-liquid mixing chamber. At this time, the abutting portion is separated from the lower end of the insertion tube portion in a state where it is disposed in the liquid cylinder, and flows through the guide surface toward the upper end opening of the liquid cylinder as described above. The liquid is introduced into the air passage through the space between the contact portion and the lower end of the insertion tube portion together with the air in the air cylinder, and is guided to the gas-liquid mixing chamber.
Therefore, even if the content liquid in the container body flows into the air cylinder from the air introduction hole, the content liquid can be guided to the gas-liquid mixing chamber together with air through the air passage during the discharge operation of the content liquid. Thus, the content liquid can be prevented from remaining in the air cylinder.

  The guide surface may extend radially inward from a portion where the air introduction hole is formed at the bottom of the air cylinder.

  In this case, since the guide surface extends radially inward from the portion where the air introduction hole is formed at the bottom of the air cylinder, the content liquid that has flowed into the air cylinder from the air introduction hole, It can be made easy to reach the guide surface. As a result, the content liquid that has flowed into the air cylinder can reliably flow along the guide surface toward the upper end opening of the liquid cylinder, and the content liquid remains in the air cylinder. Can be effectively suppressed.

  The guide surface may be provided over the entire circumference in the circumferential direction so as to surround the upper end opening of the liquid cylinder from the outside in the radial direction.

  In this case, since the guide surface is provided over the entire circumference in the radial direction outside the upper end opening of the liquid cylinder at the bottom of the air cylinder, the content flowing in from the air introduction hole The liquid can be easily concentrated toward the upper end opening of the liquid cylinder. Thereby, it can suppress effectively that a content liquid remains in the cylinder for air.

  The bottom of the air cylinder may be provided with a recess that is recessed downward, and the air introduction hole may be formed on the bottom surface of the recess.

  In this case, since the air introduction hole is formed in the bottom surface of the depression, even if the content liquid flowing in from the air introduction hole does not reach the guide surface, the content liquid in the depression is removed from the air introduction hole. It becomes possible to flow out into the container body, and it is possible to effectively suppress the content liquid from remaining in the air cylinder.

  According to the present invention, liquid outside the container body is prevented from unintentionally flowing into the air cylinder, and liquid such as water and content liquid that has unintentionally flowed into the air cylinder is discharged during use. can do.

It is a longitudinal cross-sectional view which shows the foam discharger which concerns on one Embodiment of this invention. It is a longitudinal cross-sectional view of the foam discharger shown in FIG. 1, and is a view showing a state where the pressing head is pressed and the stem is moved down to the lower end position. FIG. 3 is an enlarged longitudinal sectional view of a main part of the foam discharger shown in FIG. 2.

  Hereinafter, a foam dispenser 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. The foam discharger 10 discharges the content liquid in the form of foam. Examples of the content liquid include skin washing liquid (hand soap, body soap) and the like.

  As shown in FIG. 1, the foam discharger 10 is erected such that a mounting cap 11 is mounted on the mouth portion 1a of the container body 1 in which the content liquid is stored, and the mouth portion 1a is movable downward while being biased upward. A pump 13 having the stem 12, a pressing head 15 attached to the stem 12 and having a nozzle hole 14 formed therein, and a regulating member 19 that is detachably attached to the mounting cap 11 and restricts pressing of the pressing head 15. It is equipped with.

  Here, the mounting cap 11 is formed in a cylindrical shape that opens up and down, and the pressing head 15 is formed in a topped cylindrical shape. The central axes of the mounting cap 11, the stem 12, and the pressing head 15 are located on a common axis. Hereinafter, this common axis is referred to as the axis O, the direction along the axis O is referred to as the up-down direction, the pressing head 15 side along the up-down direction is referred to as the upper side, and the opposite side is referred to as the lower side. In the plan view of the foam discharger 10 as viewed from above and below, a direction orthogonal to the axis O is referred to as a radial direction, and a direction around the axis O is referred to as a circumferential direction.

The mounting cap 11 mounts the pump 13 on the container body 1. The mounting cap 11 includes an annular ceiling wall portion 16 disposed on the mouth portion 1 a of the container body 1, a guide cylinder portion 17 erected on the inner peripheral edge of the ceiling wall portion 16, and an outside of the ceiling wall portion 16. And a mounting peripheral wall portion 18 that extends downward from the peripheral edge portion and is mounted on the mouth portion 1a. The mouth portion 1a and the mounting peripheral wall portion 18 are fitted, for example, by screwing or undercutting.
The restricting member 19 is formed in a C shape in the plan view and is detachably fitted to the guide tube portion 17.

The stem 12 is inserted into the mounting cap 11. The stem 12 includes a lower stem 20 and an upper stem 21.
An upper end portion of the lower stem 20 is disposed in the guide tube portion 17. An annular valve seat 22 is provided on the inner peripheral surface of the upper end portion of the lower stem 20 so as to protrude inward in the radial direction. A spherical liquid discharge valve 23 is provided on the valve seat 22 so as to be seated and separated. The upward movement amount of the liquid discharge valve 23 is limited by a pressing member 24 provided in the upper end portion of the lower stem 20.

  The lower portion of the upper stem 21 is fitted to the upper end portion of the lower stem 20 from the outside, and the upper stem 21 is inserted into the guide tube portion 17 of the mounting cap 11 so as to be movable up and down. The lower portion of the upper stem 21 includes a small inner diameter portion that has a small inner diameter and is located on the upper side, and a large inner diameter portion that has a large inner diameter and is located on the lower side. 20 is fitted to the upper end. The large inner diameter portion constitutes the lower end portion of the upper stem 21.

A reduced diameter portion 21 a is formed in an intermediate portion located between the upper portion and the lower portion in the upper stem 21. An upper end portion of the pressing member 24 is disposed in the reduced diameter portion 21a.
A plurality of vertical grooves 21 b extending in the vertical direction are formed on the inner peripheral surface of the small inner diameter portion in the lower portion of the upper stem 21. The upper end portion of the vertical groove 21b opens to the inside in the radial direction and communicates with the inner side of the reduced diameter portion 21a. The lower end portion of the vertical groove 21b opens to the lower side and is within the lower end portion (within the large inner diameter portion) of the upper stem 21. Communicating with

  By the way, the pump 13 includes a liquid piston 25 linked to the stem 12, a liquid cylinder 26 in which the liquid piston 25 is housed slidably up and down, an air piston 27 linked to the stem 12, and an air An air cylinder 28 in which a piston 27 is slidably accommodated in an up and down direction, a gas-liquid mixing chamber 29 for mixing the content liquid from the liquid cylinder 26 and the air from the air cylinder 28, and gas-liquid mixing A foaming member 30 that is disposed between the chamber 29 and the nozzle hole 14 and foams the gas-liquid mixture from the gas-liquid mixing chamber 29 is further provided.

  The air cylinder 28 is formed in a bottomed cylindrical shape that is accommodated in the container body 1, and the liquid cylinder 26 is formed in a cylindrical shape. Both cylinders are arranged coaxially with the axis O. A flange that protrudes radially outward is provided at the upper end portion of the air cylinder 28, and the flange is disposed on the mouth portion 1a via a packing. The bottom portion 28 a of the air cylinder 28 is located above the liquid level of the content liquid in the container body 1, and the liquid cylinder 26 extends downward from the bottom portion of the air cylinder 28. The liquid cylinder 26 and the air cylinder 28 are integrally formed. The liquid cylinder 26 has a smaller diameter than the air cylinder 28.

An air hole 28 b is provided in the peripheral wall portion of the air cylinder 28. The air hole 28 b is opened in the container main body 1 and introduces outside air into the container main body 1.
The bottom portion 28 a of the air cylinder 28 is provided with a recess 51, an air introduction hole 52, a guide surface 53, and an air valve 54.
The recess 51 is disposed on the outer peripheral edge of the bottom 28a of the air cylinder 28 and is recessed downward. The recess 51 is formed in an annular shape extending over the entire circumference in the circumferential direction.

  The air introduction hole 52 introduces air into the air cylinder 28. The air introduction hole 52 opens into the container body 1 and sucks the air in the container body 1 into the air cylinder 28. The air introduction hole 52 is formed on the bottom surface of the recess 51. A plurality of air introduction holes 52 are arranged on the bottom surface of the recess 51 at intervals in the circumferential direction, and are provided so as to surround the upper end opening of the liquid cylinder 26 from the outside in the radial direction.

  The guide surface 53 gradually extends downward from the radially outer side toward the inner side, and the radially inner end reaches the upper end opening of the liquid cylinder 26. The guide surface 53 is inclined linearly with respect to the axis O in a longitudinal sectional view. The guide surface 53 is provided over the entire circumference in the circumferential direction so as to surround the upper end opening of the liquid cylinder 26 from the outside in the radial direction. The guide surface 53 is formed in a tapered surface shape that gradually decreases in diameter from the upper side to the lower side, and an inner peripheral edge portion that is an inner end portion in the radial direction of the guide surface 53 is an upper end opening of the liquid cylinder 26. To the department.

  The guide surface 53 extends inward in the radial direction from a recess 51 which is a portion where the air introduction hole 52 is formed in the bottom 28 a of the air cylinder 28. In the present embodiment, the guide surface 53 is limited to a portion of the bottom portion 28 a of the air cylinder 28 that is located on the inner side in the radial direction with respect to the recess portion 51. The outer peripheral edge part which is the edge part of is located on the inner peripheral edge part of the hollow part 51. The guide surface 53 is provided over the entire region located between the recess 51 and the upper end opening of the liquid cylinder 26 in the bottom 28 a of the air cylinder 28.

  The air valve 54 closes the air introduction hole 52 so as to be openable and closable, allows air to flow from the container body 1 into the air cylinder 28, and allows air to flow into the container body 1 from the air cylinder 28. It is considered as a check valve that regulates the outflow. The air valve 54 opens the air introduction hole 52 when a negative pressure in the air cylinder 28 acts. The air introduction hole 52 includes a valve cylinder portion 55 and a valve body portion 56.

  The valve cylinder 55 is fitted in the recess 51. The valve cylinder portion 55 is fitted in the outer peripheral surface facing the radially inner side in the recess portion 51, and the outer peripheral surface of the valve cylinder portion 55 abuts on the outer peripheral surface of the recess portion 51, The peripheral surface is separated from the inner peripheral surface facing the outer side in the radial direction in the recessed portion 51.

  The valve body portion 56 can be elastically deformed, and is formed in an annular shape protruding in the radial direction from the valve tube portion 55. The valve body portion 56 protrudes radially inward from the inner peripheral surface of the valve tube portion 55, and the inner peripheral edge portion of the valve body portion 56 is the inner peripheral edge portion of the hollow portion 51 (the outer peripheral edge of the guide surface 53. Part).

  The valve body portion 56 gradually extends downward as it goes from the outer side to the inner side in the radial direction, and is inclined linearly with respect to the axis O in a longitudinal sectional view. In the longitudinal sectional view, the inclination angle of the valve body portion 56 with respect to the axis O is equal to the inclination angle with respect to the guide surface 53 with respect to the axis O, and the valve body portion 56 has an inclined surface that is continuous with the guide surface 53 in the radial direction. Forming.

  The air piston 27 is disposed inside the air cylinder 28 so as to be vertically slidable in an airtight state, and is disposed inside the outer slide cylinder 31, and the stem 12 is vertically slid inside. An inner sliding cylinder (insertion cylinder portion) 32 that is movably inserted, and a connecting plate 33 that connects the inner peripheral surface of the outer sliding cylinder 31 and the outer peripheral surface of the inner sliding cylinder 32 are provided.

  The stem 12 is inserted into the inner sliding cylinder 32 so as to be movable up and down. In this embodiment, the lower stem 20 is inserted into the inner sliding cylinder 32. The inner sliding cylinder 32 is packaged at the center in the vertical direction of the lower stem 20, and the inner sliding cylinder 32 is interposed between the inner peripheral surface of the inner sliding cylinder 32 and the outer peripheral surface of the lower stem 20. A communication path S2 extending over the entire length in the vertical direction is provided.

  The upper end portion of the inner sliding cylinder 32 is fitted into the lower end portion of the upper stem 21 so as to be slidable up and down. A communication gap S <b> 1, which is a vertical gap, is provided between the upper end edge of the inner sliding cylinder 32 and the lower end edge of the small inner diameter portion of the upper stem 21. In this communication gap S1, the lower end portion of the vertical groove 21b of the upper stem 21 and the upper end portion of the communication passage S2 are opened individually.

  Convex rib portions 32 a are provided on the outer peripheral surface of the inner sliding cylinder 32. A plurality of convex rib portions 32a are provided at intervals in the circumferential direction. The convex rib portion 32a is formed in a vertical rib shape extending in the vertical direction. The lower end portion of the convex rib portion 32a is connected to the connecting plate 33, and the upper end portion of the convex rib portion 32a is opposed to the lower end portion of the upper stem 21 with an interval in the vertical direction.

  The outer diameter of the lower end portion of the inner sliding cylinder 32 is smaller than the outer diameter of the portion that continues to the lower end portion from above. As shown in FIG. 3, the outer peripheral surface of the lower end portion of the inner sliding cylinder 32 is connected to the outer peripheral surface of the continuous portion via a reduced diameter surface 32b that gradually decreases in diameter from the upper side to the lower side. ing.

  As shown in FIG. 1, the gas-liquid mixing chamber 29 is provided between the lower stem 20, the upper stem 21, and the pressing member 24. The gas-liquid mixing chamber 29 can communicate with the air cylinder 28 through an air passage 36 provided in the pump 13. The air passage 36 guides the air in the air cylinder 28 to the gas-liquid mixing chamber 29. In the illustrated example, at least a part of the air passage 36 is formed between the stem 12 and the inner sliding cylinder 32. The air passage 36 includes the vertical groove 21b, the communication gap S1, and the communication passage S2. And.

  Here, in the present embodiment, a portion of the lower stem 20 located in the air cylinder 28 is provided with an annular contact portion 37 that protrudes outward in the radial direction. The upper surface portion of the contact portion 37 contacts the lower end edge of the inner sliding cylinder 32 of the air piston 27 and closes the opening of the air passage 36 in the air cylinder 28. Communication between the inside of the cylinder 28 and the gas-liquid mixing chamber 29 is blocked.

  The contact portion 37 is formed by an annular ridge extending over the entire circumference in the circumferential direction. As shown in FIG. 3, the contact portion 37 is formed by connecting a main body protrusion 37 a located on the lower side and an auxiliary protrusion 37 b located on the upper side in the vertical direction. The outer diameter of the main body protrusion 37 a is larger than the outer diameter of the auxiliary protrusion 37 b and is equal to the outer diameter of the lower end of the inner sliding cylinder 32, and is smaller than the outer diameter of the liquid cylinder 26. The main body protrusion 37a has a rectangular cross-sectional shape. The auxiliary projection 37b includes a connecting surface 37c facing upward. The connection surface 37c connects the outer peripheral surface of the portion of the lower stem 20 that continues from the upper side to the contact portion 37 and the upper surface of the main body protrusion 37a. In addition, the connection surface 37c may be formed in a straight line shape in a longitudinal sectional view, or may be formed in a curved line shape.

  As shown in FIG. 1, the liquid piston 25 is formed in a multistage cylindrical shape that gradually decreases in diameter from the lower side toward the upper side, and the stem 12 is directed upward from the liquid piston 25. It extends. The liquid piston 25 protrudes downward from the lower end opening edge of the stem 12 and is fitted in the liquid cylinder 26 so as to be slidable in the vertical direction. A lower cylinder portion 25b.

A coil spring 38 is disposed between the upper cylinder portion 25a and the inner surface of the lower end portion of the liquid cylinder 26 to support the liquid piston 25 so as to be movable downward in an upward biased state.
Inside the piston 25 for liquid and the cylinder 26 for liquid, the rod-shaped valve member 39 extended in an up-down direction is provided. The upper end portion of the valve member 39 is an upper valve body 39a that can be seated and separated from the upper end opening portion of the upper cylindrical portion 25a of the liquid piston 25, and the lower end portion of the valve member 39 is the lower end opening in the liquid cylinder 26. The lower valve body 39b can be seated and separated from the part.

  The foam member 30 is provided in the stem 12 and is fitted in the upper portion of the upper stem 21 in the illustrated example. The foaming member 30 is configured by a plurality of foaming elements 30a each having a mesh body disposed on the opening edge of a cylindrical body, two in the illustrated direction, and two in the illustrated example. The number of the foam elements 30a may be one.

  The pressing head 15 includes a head main body 41 and an exterior cylinder portion 42. The head main body 41 and the exterior cylinder part 42 are formed separately and assembled to each other. The head main body 41 includes a top wall portion 43, a mounting tube portion 44, a fitting tube portion 45, and a nozzle tube portion 47. The top wall portion 43 is disposed on the upper side of the stem 12.

The mounting cylinder portion 44 extends downward from the top wall portion 43 and is mounted on the stem 12. The mounting cylinder portion 44 is disposed coaxially with the axis O and is fitted to the upper end portion of the upper stem 21 from the outside. The lower end portion of the mounting tube portion 44 is inserted into the guide tube portion 17, and the mounting tube portion 44 is movable up and down in the guide tube portion 17.
The fitting cylinder portion 45 projects downward from the top wall portion 43 and is disposed coaxially with the axis O. The fitting cylinder part 45 surrounds the upper end part of the mounting cylinder part 44 from the outside in the radial direction.

  The nozzle cylinder portion 47 extends from the mounting cylinder portion 44 toward the outside in the radial direction, and protrudes outward in the radial direction from the fitting cylinder portion 45. The nozzle cylinder 47 communicates with the stem 12 through the upper end of the mounting cylinder 44, and the nozzle hole 14 is provided in the protruding end of the nozzle cylinder 47.

  The exterior cylinder part 42 is provided below the top wall part 43, and the upper end part of the exterior cylinder part 42 is fitted in the fitting cylinder part 45. An accommodation hole 42 a for accommodating the nozzle cylinder portion 47 is formed in the upper end portion of the exterior cylinder portion 42. The accommodation hole 42a is formed in a notch shape that opens upward. A gap is provided between the outer peripheral surface of the nozzle cylinder portion 47 and the inner peripheral surface of the accommodation hole 42a so as to communicate the inside and the outside of the exterior cylinder portion 42. The exterior cylinder part 42 surrounds the mounting cylinder part 44 and the guide cylinder part 17 from the outside in the radial direction, and the inside of the exterior cylinder part 42 can communicate with the air cylinder 28 through the guide cylinder part 17. Yes.

  Next, the operation of the foam discharger 10 will be described.

In the foam discharger 10, when discharging the content liquid, the regulating member 19 is removed and the pressing head 15 is pushed down. Then, the guide cylinder part 17 enters the gap between the mounting cylinder part 44 and the exterior cylinder part 42, and the stem 12 and the liquid piston 25 move downward while compressing and deforming the coil spring 38 in the vertical direction.
At this time, as shown in FIGS. 2 and 3, an annular introduction gap S <b> 3 extending over the entire circumference in the circumferential direction is provided between the lower end of the inner sliding cylinder 32 and the upper surface portion of the contact portion 37 in the stem 12. The air cylinder 28 and the gas-liquid mixing chamber 29 communicate with each other through the introduction gap S3 and the air passage 36.

  Further, at this time, with the downward movement of the liquid piston 25, the upper end portion of the liquid piston 25 is separated downward from the upper valve body 39a of the valve member 39, and the inside of the liquid cylinder 26 and the inside of the stem 12 are separated. The lower valve body 39b of the valve member 39 is also moved downward, and the lower valve body 39b is seated and closed at the lower end opening in the liquid cylinder 26.

  And the piston 27 for air is also moved below because the lower end edge of the upper stem 21 contact | abuts to the upper end part of the said convex rib part 32a. At this time, outside air is sucked into the upper chamber located above the air piston 27 in the air cylinder 28 through the space between the mounting cylinder portion 44 and the guide cylinder portion 17, and the like. The air in the lower chamber located below the piston 27 is compressed. Thus, the air in the lower chamber flows into the air passage 36 from the introduction gap S3 and is transferred to the gas-liquid mixing chamber 29.

  Further, at this time, the lower valve body 39b of the valve member 39 closes the lower end opening of the liquid cylinder 26, and the liquid piston 25 moves downward, so that the content liquid in the liquid cylinder 26 rises. To reach into the stem 12. Then, the liquid pressure in the liquid cylinder 26 is applied to the liquid discharge valve 23 in the stem 12, and the liquid discharge valve 23 is separated upward from the valve seat 22, thereby evacuating the content liquid in the liquid cylinder 26. The liquid is mixed into the liquid mixing chamber 29.

In this way, after the content liquid and air are merged in the gas-liquid mixing chamber 29, the content liquid is foamed by passing through the foaming member 30, and then passes through the upper end part of the mounting cylinder part 44 and the nozzle cylinder part 47. The foam is discharged from the nozzle hole 14.
As shown in FIGS. 2 and 3, when the stem 12 is moved down to the lower end position as a result of the pressing head 15 being pushed down, for example, the lowering movement of the liquid piston 25 is restricted, the contact portion 37 is disposed in the upper end opening of the liquid cylinder 26, and the introduction gap S <b> 3 opens on the inner peripheral edge that is the inner end of the guide surface 53 in the radial direction.

  Thereafter, when the push-down head 15 is released, the liquid piston 25 is pushed upward by the elastic restoring force of the coil spring 38. Thereby, the upper end opening of the upper cylinder portion 25a of the liquid piston 25 contacts the upper valve body 39a, the communication between the liquid cylinder 26 and the stem 12 is blocked, and the lower valve body 39b is The container body 1 and the liquid cylinder 26 communicate with each other by separating from the lower end opening in the liquid cylinder 26, and the content liquid in the container body 1 flows into the liquid cylinder 26. At this time, the inside of the container main body 1 has a negative pressure, and the outside air sucked into the upper chamber is introduced into the container main body 1 through the air holes 28b.

  In addition, the stem 12 and the pressing head 15 are integrally raised together with the liquid piston 25 that rises in this way, and the contact portion 37 of the stem 12 contacts the lower end edge of the inner sliding cylinder 32 of the air piston 27. By contacting, the communication between the lower chamber and the gas-liquid mixing chamber 29 through the air passage 36 is blocked. In this state, the stem 12 and the air piston 27 are integrally raised and the internal pressure of the lower chamber is reduced, so that the air valve 54 is opened and the air introduction hole 52 is opened. The air in 1 is inhaled.

  As described above, according to the foam discharger 10 according to the present embodiment, since the air introduction hole 52 is provided in the bottom portion 28a of the air cylinder 28, the liquid outside the container body 1 is introduced into the air. It becomes possible to make it difficult to reach the hole 52, and the liquid outside the container body 1 can be prevented from unintentionally flowing into the air cylinder 28 through the air introduction hole 52.

  By the way, in this foam discharger 10, when introducing air into the air cylinder 28 from the air introduction hole 52, the liquid content in the container body 1 may flow into the air cylinder 28 together with the air. The content liquid discharged by the foam discharger 10 may foam even if the container body 1 is simply moved. At this time, if bubbles are formed on the liquid surface of the content liquid, the content liquid is discharged from the air introduction hole 52. It becomes easy to flow in unintentionally. The content liquid that has flowed into the air cylinder 28 in this way reaches the guide surface 53 of the bottom portion 28 a of the air cylinder 28, and then travels along the guide surface 53 toward the upper end opening of the liquid cylinder 26. Fluid.

  Here, when the pressing head 15 is pressed and the stem 12 is moved downward, the liquid piston 25 and the air piston 27 are linked to the stem 12 so that the pump 13 is operated and the content liquid in the liquid cylinder 26 is operated. The air in the air cylinder 28 is guided to the gas-liquid mixing chamber 29. At this time, as shown in FIG. 2 and FIG. 3, the contact portion 37 is disposed in the upper end opening of the liquid cylinder 26 and is spaced downward from the lower end of the inner sliding cylinder 32, as described above. The content liquid flowing toward the upper end opening of the liquid cylinder 26 along the guide surface 53 is introduced into the air passage 36 through the introduction gap S3 together with the air in the air cylinder 28 and into the gas-liquid mixing chamber 29. Led.

  Therefore, even if the content liquid in the container body 1 flows into the air cylinder 28 from the air introduction hole 52, the content liquid is mixed with the air through the air passage 36 during the operation of discharging the content liquid. It is possible to prevent the content liquid from remaining in the air cylinder 28.

  Further, since the guide surface 53 extends radially inward from the recess 51 where the air introduction hole 52 is formed in the bottom portion 28a of the air cylinder 28, the air cylinder is extended from the air introduction hole 52. It is possible to make the content liquid that has flowed into 28 easily reach the guide surface 53. As a result, the content liquid flowing into the air cylinder 28 can be reliably flowed along the guide surface 53 toward the upper end opening of the liquid cylinder 26, and the content liquid can flow into the air cylinder 28. Can be effectively suppressed.

  Further, since the guide surface 53 is provided over the entire circumference in the circumferential direction so as to surround the upper end opening of the liquid cylinder 26 from the outside in the radial direction, the liquid content flowing from the air introduction hole 52 is used for the liquid. It can be made easy to gather toward the upper end opening of the cylinder 26. Thereby, it can suppress effectively that a content liquid remains in the cylinder 28 for air.

  Moreover, since the air introduction hole 52 is formed in the bottom face of the hollow part 51, even if the content liquid which flowed in from the air introduction hole 52 does not reach the guide surface 53, the content liquid in the hollow part 51 is reduced. It becomes possible to flow out into the container main body 1 from the air introduction hole 52, and it can suppress effectively that a content liquid remains in the cylinder 28 for air.

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

For example, the restriction member 19 may not be provided.
Moreover, in the said embodiment, although the pressing head 15 is provided with the head main body 41 and the exterior cylinder part 42 which were formed separately, this invention is not limited to this. For example, the entire pressing head may be integrally formed.

  Moreover, in the said embodiment, although the air introduction hole 52 is formed in the bottom face of the hollow part 51, this invention is not limited to this. Moreover, there may not be a hollow part.

  Moreover, in the said embodiment, the guide surface 53 is limited and provided in the part located in the radial inside rather than the hollow part 51 which is the part in which the air introduction hole 52 was formed in the bottom part 28a of the cylinder 28 for air. However, the present invention is not limited to this. In the present invention, the guide surface can be appropriately changed to another form extending from the portion where the air introduction hole is formed at the bottom of the air cylinder toward the inside in the radial direction. For example, the guide surface may be provided over the entire bottom portion of the air cylinder, and the air introduction hole may be formed on the guide surface. Thus, the guide surface may extend inward in the radial direction from a portion positioned on the outer side in the radial direction with respect to the portion where the air introduction hole is formed at the bottom of the air cylinder.

  In the above embodiment, the guide surface 53 is provided over the entire circumference in the circumferential direction so as to surround the upper end opening of the liquid cylinder 26 from the outside in the radial direction, but the present invention is not limited to this. . For example, you may form a guide surface with the bottom face of the concave part extended linearly in radial direction. In this case, you may extend the said concave strip part toward the inner side of radial direction from the part in which the air introduction hole was formed in the bottom part of the cylinder for air.

In the above embodiment, when the stem 12 is moved down to the lower end position, the contact portion 37 is disposed in the upper end opening of the liquid cylinder 26, but the present invention is not limited to this. For example, when the stem is moved down to the descending end position, the contact portion may be disposed in the central portion in the vertical direction of the liquid cylinder.
Moreover, in the said embodiment, although the contact part 37 is located above the lower end in the lower stem 20, this invention is not restricted to this, The position of the up-down direction of a contact part can be set suitably. . For example, the contact portion may be disposed at the lower end of the lower stem.

  Moreover, in the said embodiment, although the valve body part 56 forms the inclined surface which continues in a radial direction at the guide surface 53, this invention is not limited to this. For example, the valve body portion may extend linearly in a direction orthogonal to the axis in a longitudinal sectional view.

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

DESCRIPTION OF SYMBOLS 1 Container body 1a Mouth part 10 Foam discharge device 12 Stem 13 Pump 14 Nozzle hole 15 Press head 25 Liquid piston 26 Liquid cylinder 27 Air piston 28 Air cylinder 28a Bottom 29 Gas-liquid mixing chamber 32 Sliding cylinder (insertion) Tube)
36 Air passage 37 Abutting portion 51 Recessed portion 52 Air introduction hole 53 Guide surface

Claims (4)

A pump having a stem erected so as to be movable downward in an upwardly biased state at the mouth of the container main body containing the content liquid;
A pressing head disposed at the upper end of the stem and having a nozzle hole formed thereon,
The pump is
A liquid piston and an air piston linked to the stem;
A liquid cylinder in which the liquid piston is housed slidably up and down;
An air cylinder in which the air piston is housed slidably up and down;
A gas-liquid mixing chamber that mixes the content liquid from the liquid cylinder and the air from the air cylinder;
The cylinder for air is formed in a bottomed cylindrical shape accommodated in the container body,
The liquid cylinder extends downward from the bottom of the air cylinder,
At the bottom of the air cylinder,
An air introduction hole for introducing air into the air cylinder;
A guide surface that extends gradually downward from the outside in the radial direction toward the inside, and that has a radially inner end reaching the upper end opening of the liquid cylinder;
The stem extends upward from the liquid piston,
The air piston includes an insertion tube portion through which the stem is inserted so as to freely move up and down.
The pump includes an air passage that guides air in the air cylinder to the gas-liquid mixing chamber,
At least a part of the air passage is formed between the stem and the insertion tube portion,
The stem protrudes radially outward from the stem and abuts the lower end of the insertion tube portion, and abutment that blocks communication between the gas-liquid mixing chamber and the air cylinder through the air passage Part is provided,
The contact portion is positioned above the liquid cylinder in a state before the stem is moved downward , and when the stem is moved downward , the contact portion is disposed from above the liquid cylinder. It moves in a cylinder, is spaced apart from the lower end of the insertion tube portion, and is disposed in the liquid cylinder in a state where the gas-liquid mixing chamber and the air cylinder are communicated through the air passage. A foam dispenser characterized by that.   2. The foam discharger according to claim 1, wherein the guide surface extends radially inward from a portion where the air introduction hole is formed in a bottom portion of the air cylinder.   The foam discharger according to claim 1 or 2, wherein the guide surface is provided over the entire circumference in the circumferential direction so as to surround the upper end opening of the liquid cylinder from the outside in the radial direction. The bottom of the air cylinder is provided with a recess that is recessed downward.
The foam discharge device according to any one of claims 1 to 3, wherein the air introduction hole is formed in a bottom surface of the hollow portion.

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