JP6431337B2 - Foam dispenser - Google Patents

Description

  The present invention relates to a foam dispenser, and more particularly, to a foam dispenser that is used by being attached to a mouth neck portion of a container body and that discharges the contained content liquid into a foam by mixing it with air.

  For example, by containing liquid cleaning agents or hair preparations, and pressing the pump head while the container is left in place, the liquid content is made foamy without the need for manual stirring. Various foam discharge containers such as pump former containers have been developed. In such a foam discharge container, a foam discharger is mounted on the mouth neck of the container body to discharge the content liquid into a foam by mixing it with air. For example, the foam discharger has a piston (liquid piston) that sucks, pressurizes, and discharges the liquid content and a piston (air that sucks, pressurizes, and discharges air) in a cap portion that is attached to the mouth of the container body. And a pump mechanism comprising a cylinder portion incorporated in a concentric series arrangement. Then, each piston of the pump mechanism is actuated by pushing the pump head part protruding above the cap part, and the liquid and air are pressurized and discharged in the cylinder part respectively and mixed with each other in the merge space, mesh ring It is the structure which makes it foam-like by letting bubble production | generation members, such as pass, and discharges the content liquid outside (for example, refer patent document 1).

  Moreover, since foam discharge containers, such as a pump former container, are often used around water, such as a bathroom and a washstand, they often get wet with water. Especially in the bathroom, water such as a shower may be applied directly to the container. Furthermore, since the pump head part is often pushed with a wet hand, the periphery of the pump head part often gets wet with water. And when the pressure is released after the foam discharger presses the pump head part and discharges the liquid content in the form of foam, the inside of the cylinder part becomes negative pressure as the pump head part is pushed back upward. For example, the gap between the hollow pipe part that becomes the longitudinal flow path of the pump head part and the guide stem of the cap part, and the outside air intake hole provided in the piston that sends out the air, the pump head part and the cap The water around the part is easily sucked into the air chamber in the cylinder part inside the cap part together with the outside air. For this reason, even if water enters the air chamber, the intruded water is discharged outside the air chamber so that it is not stored in the air chamber for a long period of time. Foaming containers have also been developed that can prevent spoiled water from decaying (see, for example, Patent Document 2).

JP 7-315463 A JP 2013-35569 A

  In each of the above conventional bubble dischargers, the air passage inlet is opened and closed by loosely fitting the tubular portion of the air piston to the tubular portion of the liquid piston. Since the structure for opening and closing the inlet is complicated, it is possible to send the content liquid and air to the mixing chamber in a stable state at a predetermined gas-liquid ratio with a simpler configuration. Development of new technology is desired.

  The present invention does not require a complicated mechanism for opening and closing the inlet of the air flow path, and allows the content liquid and air to be sent to the mixing chamber and foamed in a stable state at a predetermined gas-liquid ratio with a simpler configuration. It is related with the foam dispenser which can do.

  The present invention has a pump head portion that is attached to a mouth neck portion of a container body via a cap portion and is provided so as to be capable of reciprocating with respect to the cap portion, and by performing a pressing operation on the pump head portion. The content liquid is sent to the mixing chamber via the liquid flow path, and the air is sent to the mixing chamber via the air flow path. The content liquid sent to the mixing chamber is foamed in the foaming flow path from the mixing chamber to the discharge port. A large-diameter air cylinder disposed in the container body, and a cylinder portion including a small-diameter liquid cylinder provided continuously from the air cylinder downward; An air piston provided with an air chamber tight outer periphery that slides closely along the inner peripheral surface of the air cylinder, and a liquid piston provided with a liquid chamber tight outer periphery that slides closely along the inner peripheral surface of the liquid cylinder. Including piston part The air piston and the liquid piston move together in the vertical direction in accordance with the pressing operation to the pump head portion with the air flow path always open. An extension sleeve member extending downward from the air piston and extending the air flow path below the air piston, and the air flow path extended downward by the extension sleeve member. This lower end inlet achieves the above object by providing a foam discharger that opens to the inside of the liquid cylinder at least in a state where the pump head portion is pushed down.

  According to the foam discharger of the present invention, the content liquid and the air are mixed in a stable state at a predetermined gas-liquid ratio by a simpler structure without requiring a complicated mechanism for opening and closing the inlet of the air flow path. It can be sent out and foamed.

It is sectional drawing of the foam discharge container with which the foam discharge device which concerns on preferable 1st Embodiment of this invention was attached to the mouth part of the container main body. It is sectional drawing of the state of the top dead center before pressing the pump head part of the foam discharger which concerns on preferable 1st Embodiment of this invention. It is sectional drawing along AA of FIG. (A) is a perspective view of the on-off valve provided in the lower end part of the liquid cylinder, (b) is a front view. It is sectional drawing of the state at the time of the distribution | circulation before use of the foam dispenser which concerns on preferable 1st Embodiment of this invention, and sale. It is sectional drawing of the state in the middle of the pump head part etc. rising at the time of a use start of the foam discharger which concerns on preferable 1st Embodiment of this invention. (A)-(c) is sectional drawing explaining the condition which makes a content liquid foam and is discharged by pressing a pump head part. It is sectional drawing of the state of the top dead center before pressing the pump head part of the foam discharger which concerns on preferable 2nd Embodiment of this invention. (A), (b) is sectional drawing explaining the condition which sends out a content liquid and air to a mixing chamber by pressing the pump head part of the foam discharger of 2nd Embodiment.

  As shown in FIG. 1, a foam discharger 10 according to a first preferred embodiment of the present invention is a pump former used by being attached to a foam discharge container 50 which is a so-called pump former container, and is a conventional pump former. In the same manner as described above, it is mounted on the mouth neck portion 52 of the container main body 51 of the foam discharge container 50 and has a function of discharging the content liquid into a foam by mixing it with air. That is, the foam discharger 10 includes a liquid piston 14 that is attached to the cap portion 11 attached to the neck portion 52 of the container body 51 and performs suction, pressurization, and discharge of the content liquid, and air suction, pressurization, It has a pump mechanism including a cylinder portion 15 in which air pistons 13 for discharging are concentrically arranged in series. Then, the pistons 13 and 14 of the pump mechanism are actuated by pushing the pump head part 18 protruding above the cap part 11, and the liquid and air are pressurized and discharged in the cylinder part 15, respectively. Mixing is performed in a mixing chamber 19 provided as a merge space on the side, and the mixture is foamed and discharged to the outside from the discharge port 18a.

  Moreover, the bubble discharger 10 of the first embodiment does not require a complicated mechanism for opening and closing the lower end inlet 22 of the air flow path 21 (see FIGS. 7A to 7C), as will be described later. With a simple configuration, a function of sending the content liquid and air to the mixing chamber 19 in a stable state at a predetermined gas-liquid ratio is provided. Furthermore, as will be described later, the foam discharger 10 according to the first embodiment discharges the intruded water even when water enters the air chamber 20, and the intruded water is not stored in the air chamber 20 for a long time. It has a function to do so.

  And the foam discharger 10 of this 1st Embodiment is mounted | worn with the mouth part 52 (refer FIG. 1) of the container main body 51 via the cap part 11 as shown in FIG.1 and FIG.2, and the cap part 11 is attached. The pump head portion 18 is provided so as to be capable of reciprocating with respect to the pump head portion 18, and by pressing the pump head portion 18, the content liquid is sent to the mixing chamber 19 through the liquid passage 23, and the air passage This is a discharger that sends air to the mixing chamber 19 via 21 and causes the content liquid sent to the mixing chamber 19 to foam and discharge in the foaming flow path 24 extending from the mixing chamber 19 to the discharge port 18a. The foam discharger 10 includes a cylinder portion including a large-diameter air cylinder 16 disposed in a container main body 51 (see FIG. 1) and a small-diameter liquid cylinder 17 provided continuously from the air cylinder 16 downward. 15, an air piston 13 including an air chamber contact outer peripheral portion 13 a that closely contacts and slides along the inner peripheral surface of the air cylinder 16, and a liquid chamber contact outer peripheral portion 14 a that contacts and slides along the inner peripheral surface of the liquid cylinder 17. And a piston portion 12 including a liquid piston 14 including The air piston 13 and the liquid piston 14 move together in the vertical direction in accordance with the pressing operation to the pump head portion 18 with the air flow path 21 always open. An extension sleeve member 31 that extends downward and extends the air flow path 21 below the air piston 13 is provided. Further, the lower end inlet 22 of the air flow path 21 extended downward by the extension sleeve member 31 opens at the inside of the liquid cylinder 17 in a state where at least the pump head portion 18 is pushed down (FIG. 7 ( a) to (c)). The air piston 13 and the liquid piston 14 are attached to the hollow pipe portion 27 of the pump head portion 18 so as to move up and down as a single unit without moving individually, so that the air flow path 21 is always opened. Has become

  Further, in the first embodiment, the lower end inlet 22 of the air flow path 21 is contracted between the air cylinder 16 and the liquid cylinder 17 at the top dead center before the pump head portion 18 is pushed down, as shown in FIG. The liquid cylinder is disposed close to the inner bottom wall 25 of the diameter connecting portion, preferably close to the boundary between the inner bottom wall 25 of the reduced diameter connecting portion and the liquid cylinder 17, and the pump head portion 18 is pushed down. 17 (see FIGS. 7A to 7C). The inner bottom wall 25 of the reduced diameter connecting portion includes a tapered inner bottom surface 25 a that is inclined downward from the lower end periphery of the air cylinder 16 toward the upper end periphery of the liquid cylinder 17.

  In the first embodiment, a cylinder portion 15 including an air cylinder 16 and a liquid cylinder 17 is integrally attached to the cap portion 11. In other words, the cylinder portion 15 has an upper end engaging portion 16 a provided at the upper end peripheral portion of the air cylinder 16 above the cylinder portion 15 and an inner engagement provided at the inner peripheral portion of the ceiling portion 11 a of the cap portion 11. By being connected to the part 11b so as to be fitted, it is extended and attached downward from the ceiling part 11a. A cylindrical guide tube portion 26 is integrally formed on the ceiling portion 11a of the cap portion 11 so as to penetrate the ceiling portion 11a vertically. A hollow pipe portion 27 of the pump head portion 18 is inserted into the guide tube portion 26 so as to be slidable in the vertical direction. On the outer peripheral surface of the upper half part above the ceiling part 11a of the guide cylinder part 26, a male thread ridge 26a is provided. By screwing the screwing skirt portion 27a of the pump head portion 18 onto the male thread ridge 26a, the foam discharger 10 can be used when the foam discharge container 50 is distributed and sold before use. The piston portion 12 attached integrally to the pump head portion 18 can be held at the bottom dead center position (see FIG. 5).

  The cap portion 11 is configured by screwing a mounting skirt portion 11c extending downward from the peripheral portion of the ceiling portion 11a to a male thread ridge 52a formed on the outer peripheral surface of the mouth portion 52 of the container body 51, thereby The main body 51 is detachably mounted and fixed (see FIG. 1). Accordingly, the foam discharger includes the cylinder portion 15 attached to the cap portion 11, the piston portion 12 sliding along the inner peripheral surface of the cylinder portion 15, and the pump head portion 18 attached integrally to the piston portion 12. 10 is incorporated into the container body 51.

  In the first embodiment, the pump head portion 18 includes a head main body portion 28 and a hollow pipe portion 27 as shown in FIG. An engagement flange portion 27 b is provided so as to protrude outward from the upper end portion of the hollow pipe portion 27. The above-described screwing skirt portion 27a is provided so as to extend downward integrally from the outer peripheral edge portion of the engaging flange portion 27b. The head main body 28 includes a discharge nozzle portion 28a extending in the horizontal direction and a connection pipe portion 28b extending in the vertical direction. A connecting pipe portion 28b is continuously provided on the base end side of the discharge nozzle portion 28a opposite to the discharge port 18a at the front end. On the outside of the connection pipe portion 28b, a cylindrical engagement wall 28c disposed concentrically with a space between the connection pipe portion 28b is provided.

  By connecting the upper end portion of the hollow pipe portion 27 to the lower portion of the head main body portion 28 so as to fit the engagement flange portion 27b in the space portion between the connection pipe portion 28b and the cylindrical engagement wall 28c. Thus, the pump head portion 18 in which the hollow pipe portion 27 and the head main body portion 28 are integrated is formed. As a result, the outer peripheral surface of the connection pipe portion 28b of the head main body portion 28 is in close contact with the inner peripheral surface of the upper end portion of the hollow pipe portion 27, so that the hollow interior of the discharge nozzle portion 28a and the hollow interior of the hollow pipe portion 27 are liquid. A foam flow path 24 is formed in close communication. In addition, the foam generating member 29, the air piston 13, and the liquid piston 14 are attached to the hollow pipe portion 27 so as to be movable up and down as a unit with a pressing operation to the pump head portion 12.

  In the first embodiment, the foam generating member 29 is a porous member made of, for example, a mesh material. As the foam generating member 29 made of a porous member, a formed mesh made of an outer peripheral frame portion and a mesh plate portion can be preferably used. In the first embodiment, the foam generating member 29 is supported on the upper surface portion of the upper inner overhanging valve seat portion 27c having an inverted L-shaped cross section formed to project inward from the inner surface of the intermediate portion of the hollow pipe portion 27. It is attached to the lower part rather than the connection pipe part 28b extended inside the hollow pipe part 27. The foam generating member 29 is attached to the inside of the hollow pipe portion 27 in a state where the foam generating member 29 is arranged in a plurality of stages (four stages in the present embodiment).

  Further, in the first embodiment, the hollow pipe portion 27 is fitted into the substantially lower half portion of the hollow pipe portion 27 so that the substantially upper half portion of the cylindrical portion 13b of the air piston 13 is fitted into the hollow pipe portion 27. The air piston 13 is integrally attached to the portion 27. The air piston 13 includes a hollow, vertically long, substantially cylindrical cylindrical portion 13b, and an air chamber contact outer peripheral portion 13a that slides in close contact with the inner peripheral surface of the air cylinder 16. . The air chamber contact outer peripheral portion 13a is integrally formed at the distal end peripheral portion of the annular extending flange portion 13c provided to protrude outward from the outer peripheral surface of the lower end portion of the cylindrical portion 13b. The air chamber contact outer peripheral portion 13a has a vertical cross-sectional shape having an upper contact piece and a lower contact piece that are curved in a shallow concave shape toward the outside. The air chamber contact outer peripheral part 13a exerts a strong sealing function of a double structure by elastically deforming the upper contact piece and the lower contact piece and bringing these tip parts into close contact with the inner peripheral surface of the air cylinder 16. It is supposed to be.

  In the first embodiment, the hollow interior of the air cylinder 16 below the annular projecting flange portion 13 c of the air piston 13 is an air chamber 20 that stores the air sent to the mixing chamber 19. Further, in the annular projecting flange portion 13c of the air piston 13, when the air chamber 20 becomes negative pressure, an air hole 13d for sending air into the air chamber 20 can be opened and closed by the ball valve 13e. Is provided.

  In the first embodiment, the cylindrical portion 13b of the air piston 13 has an upper half mounting portion 13f mounted on a substantially lower half portion of the hollow pipe portion 27 of the pump head portion 18, and an upper half mounting portion 13f and an annular overhang. The intermediate enlarged portion 13g between the flange portion 13c and a lower sleeve portion 13h provided so as to protrude downward from the annular projecting flange portion 13c is formed. The upper half mounting portion 13 f has an outer peripheral surface shape that substantially matches the inner peripheral surface shape of the substantially lower half portion of the hollow pipe portion 27. The upper half mounting portion 13f is disposed by inserting the upper end portion of the upper half mounting portion 13f into the inner surface side portion of the inverted L-shaped cross section of the upper inner overhanging valve seat portion 27c provided in the middle portion of the hollow pipe portion 27. At the same time, the step portion 13i with the intermediate diameter enlarged portion 13e is attached to the substantially lower half portion of the hollow pipe portion 27 in a state where the lower end portion of the hollow pipe portion 27 is in contact.

  The intermediate diameter enlarged portion 13g of the cylindrical portion 13b is formed thicker than the upper half mounting portion 13f, so that the outer peripheral surface thereof is larger than the outer peripheral surface of the upper half mounting portion 13f via the stepped portion 13i. Arranged radially outside. By pushing the upper half mounting portion 13f into the substantially lower half portion of the hollow pipe portion 27 until the step portion 13i with the upper half mounting portion 13f comes into contact with the lower end portion of the hollow pipe portion 27, the air piston 13 is moved to the pump head. It becomes possible to connect to the hollow pipe portion 27 of the portion 18 as a single unit in a stable state. Further, the intermediate enlarged portion 13g has a corner portion with a stepped portion 13i at the upper peripheral edge of the intermediate enlarged portion 13g, which is a connecting angle portion between a cylindrical wall portion 30a and an annular projecting wall portion 30b of the guide auxiliary member 30 described later. In addition, it can be contacted from below. As a result, the foam discharge container 50 can be changed from the state at the time of distribution and sale of the foam discharge container 50 in which the screwing skirt part 27a of the pump head part 18 is screwed to the upper half portion of the guide cylinder part 26 shown in FIG. When the user releases the screwing of the screwing skirt 27a during use of the pump, and the pump head 18 and the piston 12 reach the top dead center shown in FIG. Accordingly, the guide auxiliary member 30 can be pushed upward (see FIG. 6).

  The lower sleeve portion 13h of the tubular portion 13b is a substantially cylindrical portion for connecting the extension sleeve member 31 which is a separate member from the tubular portion 13b to the lower end portion of the tubular portion 13b. . The extension sleeve member 31 is a member that extends the air passage 21 downward in order to open the inlet 22 of the air passage 21 below the annular projecting flange portion 13c of the air piston 13. The inner diameter of the lower sleeve 13h is larger than the inner diameters of the upper half mounting portion 13f and the intermediate expanded portion 13g. Inside the lower sleeve 13h, a diameter expansion connecting portion 31a of an extension sleeve member 31 having an outer peripheral surface shape substantially the same as the inner peripheral surface shape of the lower sleeve 13h is connected in an airtight state. As a result, the extension main body portion 31b below the diameter expansion connecting portion 31a of the extension sleeve member 31 has its lower end portion at the top dead center before the pump head portion 18 is pushed down, and the air cylinder 16 of the cylinder portion 15 has its lower end portion. And the liquid cylinder 17 are arranged close to the inner bottom wall 25 of the reduced diameter connecting portion.

  In the first embodiment, the extension main body 31b of the extension sleeve member 31 has an inner diameter that is the same or substantially the same as the inner diameter of the upper half mounting portion 13f and the intermediate enlarged portion 13g of the tubular portion 13b of the air piston 13. It has. The liquid chamber cylindrical portion 14b of the liquid piston 14 is continuous with the hollow interior of the extension main body portion 31b of the extension sleeve member 31 and the hollow interior of the upper half mounting portion 13f and the intermediate enlarged diameter portion 13g of the cylindrical portion 13b of the air piston 13. In this state, the liquid piston 14 is integrally connected to the tubular portion 13b of the air piston 13.

  In the first embodiment, the liquid piston 14 is a substantially cylindrical piston member. The liquid piston 14 includes a vertically long substantially cylindrical liquid chamber cylindrical portion 14b and a liquid chamber contact outer peripheral portion 14a provided to project outward from the lower end portion of the liquid chamber cylindrical portion 14b. The liquid chamber cylindrical portion 14b has a length from the upper intermediate portion of the upper half mounting portion 13f of the air piston 13 to the lower end portion of the extension sleeve member 31 through the intermediate enlarged diameter portion 13g. The liquid chamber cylindrical portion 14b has an outer peripheral surface that matches the inner peripheral surface shape of the upper half mounting portion 13f and the intermediate enlarged diameter portion 13g of the air piston 13 and the inner peripheral surface shape of the extension main body portion 31b of the extension sleeve member 31. A part having a shape is included.

  In addition, the liquid chamber cylindrical portion 14b of the liquid piston 14 is arranged on the outer peripheral surface of the liquid chamber cylindrical portion 14b in the portion from the lower end portion to the intermediate step portion 13j of the upper half mounting portion 13f of the air piston 13 as shown in FIG. As also shown, the ventilation grooves 14c are provided at a plurality of locations at intervals in the circumferential direction. The ventilation grooves 14c are each formed by cutting out the outer peripheral surface of the liquid chamber cylindrical portion 14b into an elongated vertical groove shape. The ventilation groove 14c is located above the intermediate step 13j of the upper half mounting portion 13f of the air piston 13 through a communication hole formed through the intermediate step 13j of the upper half mounting portion 13f of the air piston 13. Are communicated with the upper ventilation grooves 13k formed on the outer peripheral surface (see FIGS. 2, 5, and 6). The upper ventilation groove 13k is provided at a plurality of locations at intervals in the circumferential direction by notching the outer circumferential surface into a long and narrow groove like the ventilation groove 14c on the outer circumferential surface of the liquid chamber cylindrical portion 14b. The upper ventilation groove 13k extends from the intermediate step portion 13j of the upper half mounting portion 13f of the air piston 13 to the upper end surface of the upper half mounting portion 13f and the upper portion of the hollow pipe portion 27 of the pump head portion 18. By being formed along the inner peripheral surface of the portion inserted into the inner overhanging valve seat portion 27c, it communicates with the mixing chamber 19 inside the upper half mounting portion 13f.

  Thus, the liquid chamber of the liquid piston 14 is interposed between the cylindrical portion 13b of the air piston 13 including the extension sleeve member 31 and the liquid chamber cylindrical portion 14b of the liquid piston 14 and the hollow pipe portion 27 of the pump head portion 18. The portion directly above the contact outer peripheral portion 14a reaches the enlarged diameter connecting portion 31a of the extension sleeve member 31 through the vent groove 14c on the outer peripheral surface of the liquid chamber cylindrical portion 14b, and further the vent groove 14c above the enlarged diameter connecting portion 31a. After passing through, the air flow path 21 reaching the mixing chamber 19 through the communication hole and the upper ventilation groove 13j is formed. The air flow path 21 has a lower end inlet of a lower end of the ventilation groove 14 c that opens between the liquid chamber close outer periphery 14 a of the liquid piston 14 and the lower end of the extension main body 31 b of the extension sleeve member 31. 22 is formed in an open state.

  In the first embodiment, the liquid chamber contact outer peripheral portion 14 a provided at the lower end portion of the liquid chamber cylindrical portion 14 b of the liquid piston 14 is in close contact with the inner peripheral surface of the small-diameter cylindrical liquid cylinder 17. Slide up and down in the state. As a result, the hollow interior of the liquid cylinder 17 at a lower part than the liquid chamber contact outer peripheral portion 14 a is blocked from the air chamber 20. Further, by this, the hollow interior of the liquid cylinder 17 below the liquid chamber contact outer peripheral portion 14 a stores the liquid content to be sent to the mixing chamber 19 together with the hollow interior of the liquid chamber cylindrical portion 14 b of the liquid piston 14. A liquid chamber 32 that also serves as the passage 23 is formed. Similar to the air chamber contact outer peripheral portion 13a, the liquid chamber contact outer peripheral portion 14a has a vertical cross-sectional shape having an upper contact piece and a lower contact piece that are curved in a shallow concave shape toward the outside. The liquid chamber close contact outer peripheral portion 14a exhibits a strong sealing function of a double structure by elastically deforming the upper close contact piece and the lower close contact piece and bringing these tip portions into close contact with the inner peripheral surface of the liquid cylinder 17. It is supposed to be.

  Furthermore, in the first embodiment, the liquid cylinder 17 is disposed between the overhanging base end portion of the liquid chamber contact outer peripheral portion 14 a and a liquid chamber inflow valve 33 (described later) disposed at the lower end portion of the liquid cylinder 17. The spring member 34 by a coil spring is attached, for example. The spring member 34 attaches the pump head portion 18 and the piston portion 12 upward toward the top dead center against the pressing force when the user pushes down the pump head portion 18 when the foam discharge container 50 is used. Rush.

  Furthermore, in the first embodiment, the liquid chamber cylindrical portion 14b of the liquid piston 14 is inserted into the hollow interior of the air piston 13 until the upper end reaches the upper middle portion of the upper half mounting portion 13f. At the upper end of the liquid chamber cylindrical portion 14b, there is provided an upper end valve seat portion 14d that closely contacts a flow path ball valve 35 that opens and closes the liquid flow path 23. A cylindrical portion 13b (upper half mounting) of the air piston 13 in a portion between the upper end valve seat portion 14d and the upper inner overhanging valve seat portion 27c provided in an intermediate portion of the hollow pipe portion 27 of the pump head portion 18. Inside the portion 13f), the flow path ball valve 35 is disposed so as to be movable up and down. Further, in a portion between the upper end valve seat portion 14 d provided at the upper end portion of the liquid chamber cylindrical portion 14 b of the liquid piston 14 and the foam generating member 29 attached to the inside of the hollow pipe portion 27 of the pump head portion 18. The inner region of the cylindrical portion 13b (upper half mounting portion 13f) of the air piston 13 and the inner region surrounded by the upper inner overhanging valve seat portion 27c are separated from the air sent from the air chamber 20 and the liquid chamber 32. It functions as a mixing chamber 19 for mixing the content liquid to be sent out.

  In the first embodiment, the lower end portion of the small-diameter liquid cylinder 17 communicates with the reduced diameter inlet portion 17b with an inverted substantially truncated conical portion 17a interposed therebetween. From the lower end inlet 17c at the lower end of the inlet portion 17b, the content liquid accommodated in the container main body 51 can flow into the liquid chamber 32 inside the liquid cylinder 17. A liquid chamber inflow valve 33 is provided at the lower end of the liquid cylinder 17 so as to be supported by a stepped portion with the substantially truncated conical portion 17a.

  In the first embodiment, the liquid chamber inflow valve 33 does not include a portion that is inserted into the liquid piston 14, and is a valve body that is disposed only at the lower end of the liquid cylinder 17. As a result, the liquid flow path 23 (liquid chamber 32) formed by the liquid cylinder 17 and the liquid piston 14 is substantially free of obstacles, so that the content stored in the liquid chamber 32 when the pump head unit 18 is pressed. The liquid can be sent out to the mixing chamber 19 in a stable state by a predetermined amount. Further, the liquid chamber inflow valve 33 has a function of opening and closing the inlet 17b of the liquid cylinder 17 in a stable state.

  That is, as shown in FIGS. 4 (a) and 4 (b), the liquid chamber inflow valve 33 includes a pair of mounting base portions 33a having an arcuate planar shape that are arranged to face each other at an interval in the radial direction. From the central portion of the lower section mold portion 33c, the valve body support section 33d composed of the upper cylindrical section 33b and the lower section mold section 33c, which is arranged to stand across the pair of mounting base sections 33a, is elastic. The valve body 33f is arranged so as to be suspended below the base portion 33a via the urging portion 33e. The valve main body 33f has a shape in which the outer peripheral surface is reduced in diameter to a taber shape downward. The liquid chamber inflow valve 33 is attached to the lower end portion of the liquid cylinder 17 by placing a pair of mounting base portions 33a on a stepped portion with the substantially truncated cone-shaped portion 17a (FIGS. 2, 5, and 6). reference). The lower end portion of the spring member 34 is brought into contact with the upper surface of the pair of mounting base portions 33a. The lower end portion of the spring member 34 is in contact with the protruding base end portion of the liquid chamber contact outer peripheral portion 14a of the liquid piston 14. Due to the urging force of the spring member 34, the mounting base portion 33 a is pressed against the stepped portion with the substantially truncated cone-shaped portion 17 a and maintains a state of being firmly attached to the stepped portion. Thus, the liquid chamber inflow valve 33 is attached to the lower end portion of the liquid cylinder 17 in a stable state. Further, as a result, the valve main body 33f of the liquid chamber inflow valve 33 is smoothly brought into close contact with the inner peripheral surface of the inverted substantially truncated conical portion 17a by the biasing force from the elastic biasing portion 33e. Thus, the inlet 17b of the liquid cylinder 17 can be effectively closed.

  The liquid chamber inflow valve 33 maintains a state in which the valve main body 33f is in close contact with the inner peripheral surface of the substantially truncated cone-shaped portion 17a when the inside of the liquid chamber 32 by the liquid cylinder 17 and the liquid piston 14 is positive pressure. Then, the inlet portion 17b is closed. When the inside of the liquid chamber 32 formed by the liquid cylinder 17 and the liquid piston 14 becomes negative pressure, the liquid chamber inflow valve 33 contracts and deforms the elastic urging portion 33e against the urging force of the elastic urging portion 33e. Then, the valve main body 33f is separated from the inner peripheral surface of the substantially truncated cone-shaped portion 17a to open the inflow port portion 17b. As a result, the content liquid stored in the container main body 51 can flow into the liquid chamber 32 inside the liquid cylinder 17.

  In the first embodiment, as shown in FIGS. 2, 5, and 6, the air cylinder 16 is provided above the annular projecting flange portion 13 c of the air piston 13 and the air chamber contact outer peripheral portion 13 a. A guide auxiliary member 30 that is disposed so as to overlap is provided with a cylindrical wall portion 30 a, an annular projecting wall portion 30 b, and a close contact outer peripheral wall portion 30 c. The guide auxiliary member 30 is configured such that the cylindrical wall portion 30a is inserted and disposed in a space portion between the guide cylindrical portion 26 of the cap portion 11 and the hollow pipe portion 27 of the pump head portion 18 inserted through the guide cylindrical portion 26. It is attached. Further, the guide auxiliary member 30 is attached in a state where the upper end portion of the inserted cylindrical wall portion 30 a protrudes upward from the guide cylindrical portion 26. The guide auxiliary member 30 fills the gap in the space between the guide tube portion 26 of the cap portion 11 and the hollow pipe portion 27 of the pump head portion 18 with the tube wall portion 30a. It becomes possible to guide the sliding in the direction in a more stable state. In addition, it is possible to effectively prevent external water from flowing into the air cylinder 16 through the space between the guide tube portion 26 and the hollow pipe portion 27.

  The guide auxiliary member 30 is distributed and sold before the foam discharge container 50 is used in which the screwing skirt portion 27a of the pump head portion 18 is screwed to the upper half portion of the guide tube portion 26 shown in FIG. In FIG. 2, substantially the entire cylindrical wall portion 30a is accommodated inside the cap portion 11. When the user starts to use the foam discharge container 50, the guide auxiliary member 30 is configured so that the pump head portion 18 and the piston portion 12 are spring members as shown in FIG. When it rises by the urging force of 34, the corner | angular part of the intermediate | middle enlarged diameter part 13g of the cylindrical part 13b of the air piston 13 contact | abuts from the downward direction to the connection angle | corner part of the cylindrical wall part 30a and the annular projecting wall part 30b. As a result, the guide auxiliary member 30 is pushed upward until the upper surface of the base end portion on the cylindrical wall portion 30a side of the annular projecting wall portion 30b contacts the lower end portion 26b of the guide cylindrical portion 26 of the cap portion 11. As a result, when the pump head portion 18 and the piston portion 12 are raised to the top dead center, the guide auxiliary member 30 moves the upper end portion of the cylindrical wall portion 30a with a considerable protruding length as shown in FIG. It arrange | positions in the state protruded upwards rather than the guide cylinder part 26. FIG.

  After the pump head portion 18 and the piston portion 12 have moved to the top dead center, the guide auxiliary member 30 has a tight outer peripheral wall portion 30c connected to the outer peripheral edge portion of the annular projecting wall portion 30b. By being in close contact, the raised position can be maintained. The guide auxiliary member 30 in which the upper end portion of the cylindrical wall portion 30a protrudes upward from the guide cylindrical portion 26 with a considerable protruding length, for example, in order to store the foam discharge container 50, the screwing skirt of the pump head portion 18 By holding the raised position until the portion 27a is screwed to the upper half of the guide tube portion 26 again, it is possible to continue to prevent external water from flowing into the air cylinder 16. .

  In the foam dispenser 10 according to the first embodiment having the above-described configuration, in the distribution and sales before the foam discharge container 50 is used, as shown in FIG. The screw skirt 27a of the pump head 18 is screwed to maintain a compact shape. The user who has purchased the foam discharge container 50 releases the state in which the pump head portion 18 is screwed to the guide tube portion 26, so that the pump head portion 18 is disposed inside the liquid cylinder 17 as shown in FIG. 6. The piston member 12 is lifted together by the elastic biasing force of the spring member 34 disposed on the piston member 12. As shown in FIG. 2, the pump head portion 18 that rises together with the piston portion 12 is such that the upper surface of the base end portion on the cylindrical wall portion 30 a side of the annular protruding wall portion 30 b of the guide auxiliary member 30 is the guide cylindrical portion of the cap portion 11. When it comes into contact with the lower end portion 26b of the main body 26, the position does not rise any more with the position as the top dead center. At this top dead center, the liquid chamber close outer peripheral portion 14a at the lower end portion of the liquid piston 14 is in close contact with the inner peripheral surface of the liquid cylinder 17 at the upper end portion of the liquid cylinder 17, and the lower end portion of the extension sleeve member 31 is By being arranged close to the inner bottom wall 25 of the reduced diameter connecting portion between the air cylinder 16 and the liquid cylinder 17, the lower end inlet 22 of the air flow path 21 is also connected to the inner bottom wall 25 of the reduced diameter connecting portion. Placed close together.

  As described above, after the pump head portion 18 reaches the top dead center together with the piston portion 12, the guide auxiliary member 30 is brought into close contact with the inner peripheral surface of the air cylinder 16 by closely contacting the outer peripheral wall portion 30 c. The state where the upper surface of the base end portion on the cylindrical wall portion 30a side of the annular projecting wall portion 30b is in contact with the lower end portion 26b of the guide cylindrical portion 26 of the cap portion 11 is maintained. Therefore, when the pressing operation to the pump head portion 18 is repeatedly performed continuously, the pump head portion 18 rises together with the piston portion 12, and the corner portion of the intermediate enlarged portion 13 g of the cylindrical portion 13 b of the air piston 13. However, the pump head portion 18 reaches the top dead center by coming into contact with the connecting angle portion between the cylindrical wall portion 30a and the annular protruding wall portion 30b of the guide auxiliary member 30 from below.

  In the first embodiment, when the foam discharge container 50 is used, the pump head 18 repeatedly applies a pressing force to the pump head 18 with respect to the foam discharger 10 that has reached the top dead center together with the piston 12. Thus, the content liquid can be discharged from the discharge port 18a at the tip of the discharge nozzle portion 28a of the head main body 28 in a state where the content liquid is mixed with air to form a foam.

  That is, according to the first embodiment, the pump head unit 18 is idled a plurality of times until the liquid in the liquid chamber 32 by the liquid cylinder 17 and the liquid piston 14 is filled with the liquid in the liquid chamber 32. After the filling, a pressing operation to the pump head unit 18 is further performed. Since the lower end inlet 22 of the air flow path 21 by the lower end part of the ventilation groove 14c formed in the outer peripheral surface of the liquid chamber cylindrical part 14b of the liquid piston 14 remains open (see FIG. 2). 7 (a) to 7 (b), the air inside the air chamber 20 is pressurized by pressurizing the air chamber 20 as the air piston 13 descends as the pump head 18 is pushed. Is pushed out and sent out to the mixing chamber 19 through the air flow path 21. Further, the liquid chamber 32 is pressurized as the liquid piston 14 descends due to the pushing of the pump head part 18, thereby pushing up the flow path ball valve 35 that has been in close contact with the upper end valve seat part 14 d, The liquid inside the liquid chamber 32 is sent out to the mixing chamber 19 via the liquid flow path 23.

  The content liquid and the air sent to the mixing chamber 19 are mixed in the mixing chamber 19 and foamed into a foam shape by passing through the foam generating member 29, and then the tip of the pump head portion 18 through the foaming channel 24. From the discharge port 18a.

  When the pump head portion 18 is pushed down until the air chamber contact outer peripheral portion 13a of the air piston 13 approaches the inner bottom wall 25 of the reduced diameter connecting portion between the air cylinder 16 and the liquid cylinder 17, and the one-stroke pressing operation is completed. (Refer to FIG. 7C), the pressure on the pump head 18 is released. When the pressure on the pump head 18 is released, the air piston 16 and the liquid piston 14 are pushed upward together with the pump head 18 by the biasing force of the spring member 34. As a result, the inside of the air chamber 20 and the inside of the liquid chamber 32 become negative pressure, so that the ball valve 13e provided in the annular projecting flange portion 13c of the air piston 13 is opened, and the air chamber is opened via the air hole 13d. It becomes possible to allow outside air to flow into 20. Further, the flow path ball valve 35 is brought into close contact with the upper end valve seat portion 14 d at the upper end portion of the liquid piston 14 to close the liquid flow path 23, and the liquid chamber inflow valve 33 provided at the lower end portion of the liquid cylinder 17. The valve main body 33f moves upward against the urging force from the elastic urging portion 33e. As a result, the close contact state of the tapered outer peripheral surface of the valve main body 33f with the substantially truncated cone-shaped portion 17a is released, and the inlet portion 17b of the liquid cylinder 17 is opened. The content liquid accommodated in the container main body 51 can smoothly flow into the liquid chamber 32.

  As a result, according to the foam discharger 10 of the first embodiment, a simpler configuration can be achieved with the air flow path 21 being always open without requiring a complicated mechanism for opening and closing the inlet of the air flow path. By this, it becomes possible to feed the content liquid and air to the mixing chamber 19 in a stable state at a predetermined gas-liquid ratio and to cause foaming.

  In addition, according to the foam discharger 10 of the first embodiment, the extension sleeve member 31 is provided, so that the lower end inlet 22 of the air flow path 21 is provided with the annular protruding flange portion 13c protruding. It opens below the lower end of the cylindrical portion 13b of the air piston 13. As a result, the lower end inlet 22 of the air flow path 21 opens inside the liquid cylinder 17 at least when the pump head portion 18 is pushed down. Further, when the pump head portion 18 is pushed down, the air in the air chamber 20 passes through a narrow gap between the outer peripheral surface of the extension sleeve member 31 and the inner peripheral surface of the liquid cylinder 17, and then the air flow path. 21, the pressure of the air inside the air chamber 20 is likely to rise, so that the ball valve 13e that closes the air hole 13d can be operated reliably, and a predetermined amount It becomes possible to send out the air to the mixing chamber 19 in a stable state. In a state where the pump head portion 18 is pushed down, the extension sleeve member 31 is inserted into a space portion between the liquid chamber cylindrical portion 14b of the liquid piston 14 and the liquid cylinder 17 to fill a gap between these space portions. Therefore, the liquid piston 14 can be prevented from being twisted. By these, in a more stable state, the content liquid and air can be sent out to the mixing chamber 19 at a predetermined gas-liquid ratio to be foamed.

  Furthermore, according to the foam discharger 10 of the first embodiment, for example, even when the foam discharge container 50 is used in a bathroom or the like and water enters the air chamber 20, the intruded water is discharged and invaded. It is possible to prevent water from being stored in the air chamber 20 for a long time. That is, according to the first embodiment, the extension sleeve member 31 is provided, so that the lower end inlet 22 of the air flow path 21 is at least inside the liquid cylinder 17 in a state where the pump head portion 18 is pushed down. It is designed to open. Therefore, the water that has entered the inside of the air chamber 20 and is stored on the inner bottom wall 25 of the reduced diameter connecting portion at the bottom of the air chamber 20 is operated by pressing the pump head portion 18 to When air is fed into the mixing chamber 19, it is allowed to flow into the liquid cylinder 17, further flow into the air channel 21 from the lower end inlet 22 together with air, and send out to the mixing chamber 29 via the air channel 21. it can. The water sent to the mixing chamber 29 together with the air is mixed with the content liquid and air in the mixing chamber 29 and foamed into a foam by passing through the foam generating member 29, and then discharged from the tip of the pump head portion 18. 18a is discharged together with the content liquid. As a result, even when water enters the air chamber 20, the intruded water is smoothly discharged, so that germs can be generated in the air chamber 20, the invaded water can be spoiled, or a bad odor can be generated. Can be effectively avoided.

  Furthermore, according to the foam discharger 10 of the first embodiment, the content liquid is fed into the air chamber 20 when the discharged content liquid contains a sterilizing or antibacterial component. Thus, the inside of the air chamber 20 can be sterilized and the foam discharge container 50 can be used more hygienically. That is, according to the first embodiment, a complicated mechanism for opening and closing the inlet of the air flow path is not provided, and the lower end inlet 22 of the air flow path 21 releases the pressure of the pump head portion 18. After that, it remains open. Accordingly, when the pressure on the pump head portion 18 is released and the air piston 13 rises and the air chamber 20 becomes negative pressure, the content remaining in the foaming flow path 24 and the like due to the suction force due to the negative pressure. The liquid can be made to flow backward through the air flow path 21 and sent into the air chamber 20 from the lower end inlet 22. The foam discharge container 50 can be used hygienically for a long period of time by the sterilizing action or antibacterial action of the content liquid fed into the air chamber 20. Note that the amount of the backflow of the content liquid can be adjusted by, for example, the channel area of the air channel 21, the channel length, and the like.

  And when the foam discharger 10 of this 1st Embodiment presses the pump head part 18, 4-20 cc of air is sent from the air chamber 20 to the mixing chamber 19 with a vertical stroke of 10-30 mm, for example, The mixing ratio can be appropriately varied so that 0.3 to 1.55 cc of the content liquid can be sent from the liquid chamber 32 to the mixing chamber 19. Preferably, 13 cc of air can be fed and 1 cc of the content liquid can be fed, or the ratio of the air to the liquid to be fed can be designed to be 13: 1.

  Further, within each of the above ranges, the foam discharger 10 according to the first embodiment allows 13 cc of air from the air chamber 20 to the mixing chamber 19 with a vertical stroke of, for example, 25 mm when the pump head unit 18 is pressed. It is also possible to design such that 1 cc of the content liquid is fed from the liquid chamber 32 to the mixing chamber 19. For this reason, for example, the mouth inner diameter of the mouth part 52 of the container body 51 is φ29 so that 0.52 cc / mm of air can be sent per 1 mm vertical stroke and the content liquid of 0.04 cc / mm can be sent. 0.5 mm, the longest width of the container body 51 is 90 mm, and the outer diameter of the air cylinder 16 can be designed to be around φ29.4 mm.

  Thus, for example, in order to send 13 cc of air from the air chamber to the mixing chamber with a vertical stroke of 18 mm and 1 cc of the content liquid from the liquid chamber to the mixing chamber, 0.72 cc / mm of air per 1 mm vertical stroke. For example, the inner diameter of the mouth part of the container body is φ36.1 mm, the longest width of the container body is 90 mm, and the outer diameter of the air cylinder is φ34 so that the content liquid of 0.056 cc / mm can be sent. Compared with the conventional foam dispenser designed to be 9 mm, the air cylinder 16 can be made smaller in diameter and the stroke can be lengthened, so that it can be used for pressing operation. When the inertial force acts, it becomes possible to reduce the resistance when the content liquid is discharged in the form of foam.

  Further, by reducing the diameter of the air cylinder 16, it becomes possible to reduce the mouth inner diameter of the neck portion 52 of the container body 51, and not only the amount of resin is reduced, but also the mouth inner diameter of the mouth neck portion 52 of the container body 51. Dimensional stability can also be improved. When the container body of the same resin amount is molded by blow molding, the smaller the inner diameter of the mouth part of the container body, the better the shapeability and the better the dimensional stability when finishing the neck part with blow pins It will be.

  Furthermore, the smaller the inner diameter of the mouth part of the container body, the smaller the diameter of the parison can be. As a result, the width of the pinch-off part at the bottom of the container body can be reduced, and the ESCR (anti-resistance) It becomes possible to mold a container excellent in environmental stress fracture.

  FIG. 8 shows a foam dispenser 10 'according to a second preferred embodiment of the present invention. The foam discharger 10 ′ according to the second embodiment has a length of an extension sleeve member 31 ′ for opening a lower end inlet 22 ′ to the air flow path 21 below the annular projecting flange portion 13c of the air piston 13. However, it has the same configuration as the foam dispenser 10 of the first embodiment except that it is different from that of the first embodiment. In addition, in the foam discharger 10 ′ of the second embodiment, the same components as those of the foam discharger 10 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is appropriately omitted. . The description of the foam dispenser 10 of the first embodiment is applied as appropriate to the components having the same reference numerals as those of the foam dispenser 10 of the first embodiment.

  In the foam discharger 10 ′ according to the second embodiment, the extension sleeve member 31 ′ connected to the lower sleeve portion 13h of the cylindrical portion 13b of the air piston 13 is located above the pump head portion 18 shown in FIG. At the dead point, the lower end portion of the extension main body 31b ′ is attached in a state of being separated from the inner bottom wall 25 of the reduced diameter connecting portion between the air cylinder 16 and the liquid cylinder 17. That is, the extension sleeve member 31 ′ is in a state in which the lower end portion of the extension main body portion 31 b ′ is arranged at the intermediate portion in the vertical direction between the inner bottom wall 25 of the reduced diameter connection portion and the annular protruding flange portion 13 c of the air piston 13. It is attached with. Thereby, the ventilation groove 14c formed in the outer peripheral surface of the liquid chamber cylindrical portion 14b of the liquid piston 14 in a portion adjacent to the lower end portion of the extension main body portion 31b ′ serves as a lower end inlet 22 ′ to the air flow path 21. In the reduced diameter connecting portion, an opening is opened in the middle in the vertical direction between the inner bottom wall 25 of the reduced diameter connecting portion and the annular projecting flange portion 13c.

  Also by the foam discharger 10 ′ of the second embodiment, the lower end inlet 22 ′ of the air channel 21 that opens to the middle portion in the vertical direction between the inner bottom wall 25 of the reduced diameter connecting portion and the annular projecting flange portion 13c. Is in an open state, as shown in FIGS. 9 (a) and 9 (b), as the air piston 13 descends due to the pump head portion 18 being pushed, The air can be smoothly sent out to the mixing chamber 19. As the pump head 18 is pushed further in, the lower end inlet 22 ′ of the air passage 21 opens to the inside of the liquid cylinder 17. This makes it possible to send a predetermined amount of air to the mixing chamber 19 in a stable state and to prevent the liquid piston 14 from being twisted, as in the foam discharger 10 of the first embodiment. become. Furthermore, the water that has entered the air chamber 20 can be sent out to the mixing chamber 19 together with the air and discharged.

  Further, according to the foam discharger 10 ′ of the second embodiment, the lower end inlet 22 ′ of the air flow path 21 presses the pump head portion 18 in the same manner as the foam discharger 10 of the first embodiment. Even after opening, it remains open. As a result, the content liquid remaining in the foaming flow path 24 or the like is caused to flow backward through the air flow path 21 and sent to the air chamber 20, thereby causing the foam discharge container to have a sterilizing action or an antibacterial action of the sent content liquid. 50 can be used hygienically for a long time.

  In particular, in the second embodiment, the lower end inlet 22 ′ of the air flow path 21 is formed at the top dead center before the pump head part 18 is pushed down, with the inner bottom wall 25 of the reduced diameter connecting part, the annular projecting flange part 13c, A gap portion having a considerable height is formed between the lower end inlet 22 ′ of the air passage 21 and the liquid chamber contact outer peripheral portion 14 a of the liquid piston 14. 36 is held (see FIG. 8). Accordingly, the one-stroke pressing operation in which the pump head portion 18 is pushed down until the air chamber tight outer peripheral portion 13a of the air piston 13 approaches the inner bottom wall 25 of the reduced diameter connecting portion between the air cylinder 16 and the liquid cylinder 17. After that, as shown in FIG. 9B, the gap portion 36 between the lower end inlet 22 ′ of the air flow path 21 and the liquid chamber close outer periphery 14a of the liquid piston 14 has a bactericidal or antibacterial effect. A small amount of the content liquid having an action or water mixed with the content liquid is left without being discharged through the air flow path 21. As a result, a content liquid having a bactericidal action or an antibacterial action is always present in the lower part of the air piston 13 below the air chamber contact outer peripheral part 13a, so that the foam discharge container 50 should be used more hygienically. Is possible. Note that the amount of content liquid or the like remaining can be adjusted by, for example, the length of the interval portion 36 described above.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the extension sleeve member that extends downward from the air piston and extends the air flow path below the air piston does not necessarily have to be provided as a separate member from the air piston. The extension sleeve member can also be provided by being molded integrally with the air piston. For example, the cylindrical portion of the air piston itself can be extended as an extension sleeve member below the annular overhanging flange, and the lower end inlet of the air flow path can be opened below the annular overhanging flange.

10,10 'foam dispenser (pump former)
DESCRIPTION OF SYMBOLS 11 Cap part 12 Piston part 13 Air piston 13a Air chamber contact outer peripheral part 13b Cylindrical part 13c Annular overhang flange part 13d Air hole 13e Ball valve 13h Lower sleeve part 13k Upper ventilation groove 14 Liquid piston 14a Liquid chamber close outer periphery part 14b Liquid chamber Cylindrical portion 14c Ventilation groove 15 Cylinder portion 16 Air cylinder 17 Liquid cylinder 17a Substantially frustoconical portion 17b Inlet portion 17c Lower end inlet 18 Pump head portion 18a Discharge port 19 Mixing chamber 20 Air chamber 21 Air flow path 22, 22 ' Lower end inlet 23 Liquid flow path 24 Air cylinder 25 Inner bottom wall 26 of reduced diameter connection portion Guide tube portion 27 Hollow pipe portion 28 Head body portion 28a Discharge nozzle portion 29 Foam generating member 30 Guide auxiliary members 31, 31 ′ Extension sleeve member 31a Diameter expansion connection part 31b, 31b 'Extension main-body part 32 Liquid chamber 3 Liquid chamber inflow valve 33a Mounting base portion 33d Valve body support portion 33e Elastic urging portion 33f Valve body 34 Spring member 35 Flow path ball valve 36 Between the lower end inlet of the air flow path and the air chamber close outer periphery of the air piston Interval part 50 foam discharge container (pump former container)
51 Container body 52 Mouth

Claims (2)

A liquid flow path is provided by having a pump head portion mounted on the neck of the container body via a cap portion and provided so as to be capable of reciprocating with respect to the cap portion, and performing a pressing operation on the pump head portion. The content liquid is sent to the mixing chamber via the air, and the air is sent to the mixing chamber via the air flow path, and the content liquid sent to the mixing chamber is foamed and discharged in the foaming flow path from the mixing chamber to the discharge port. A foam dispenser,
A cylinder portion including a large-diameter air cylinder disposed in the container body, and a small-diameter liquid cylinder provided continuously from the air cylinder downward;
An air piston provided with an air chamber tight outer periphery that slides closely along the inner peripheral surface of the air cylinder, and a liquid piston provided with a liquid chamber tight outer periphery that slides closely along the inner peripheral surface of the liquid cylinder. And including a piston part,
The air piston and the liquid piston are configured to move integrally up and down in accordance with a pressing operation to the pump head portion in a state where the air flow path is always open.
An extension sleeve member is provided that extends downward from the air piston and extends the air flow path below the air piston.
The lower end inlet of the air flow path extended downward by the extension sleeve member opens at least inside the liquid cylinder in a state where the pump head portion is pushed down .
The extension sleeve member is attached at a top dead center before the pump head part is pushed down, with a lower end thereof spaced above the inner bottom wall of the reduced diameter connecting portion between the air cylinder and the liquid cylinder. Accordingly, the lower end inlet of the air flow path is opened above the inner bottom wall of the reduced diameter connecting portion . 2. The air piston and the liquid piston are attached to a hollow pipe portion of the pump head portion so as to be vertically movable so that the air flow path is always open. Foam dispenser.

Images