Patent Publication Number: US-10758925-B2

Title: Foamer dispenser, and container with foamer dispenser

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 14/904,798, filed Jan. 13, 2016, now U.S. Pat. No. 10,144,026, which is a 371 of International Application No. PCT/JP2014/003814, filed Jul. 17, 2014, the contents of which are incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to a foamer dispenser, an container with the foamer dispenser. 
     BACKGROUND 
     Some known containers are equipped with a foamer dispenser that causes a liquid pumped out of a container body to be ejected in the form of foam through a foaming net (mesh filter) by repeated pushing and releasing of the head. (Refer to Patent Literature 1, for example.) 
     CITATION LIST 
     Patent Literature 
     
         
         PTL1: JPH08230961A 
       
    
     SUMMARY 
     Technical Problem 
     Even such a conventional foamer dispenser can suffer from variation in foam quality depending on ingredients or the like of the liquid to be foamed. For example, as illustrated in  FIG. 5A , even in a single piece of foam F, a small air bubble B 1  and a large air bubble B 2  are sometimes present. For the foam with such a quality, there is room for improvement in terms of the appearance and texture. 
     The present disclosure is to provide a foamer dispenser and a container with the foamer dispenser both of which are capable of ejecting a content medium with a satisfactory foam quality. 
     Solution to Problem 
     One of aspects of the present disclosure resides in a foamer dispenser, including: a pump cover that is fitted to a container body; a pump cylinder that includes a large-diameter portion fixed to the pump cover and a small-diameter portion; a small-diameter piston that is received in the small-diameter portion of the pump cylinder and that is configured to suck and pump a liquid in the container body; a large-diameter piston that is received in the large-diameter portion of the pump cylinder and that is configured to suck and pump ambient air; a head that causes pumping movement of the small-diameter piston and the large-diameter piston and that ejects a mixture of the liquid and the ambient air by a user pushing and releasing the head repeatedly; a liquid flow path of the liquid pumped from the small-diameter piston; an ambient air flow path of the ambient air pumped from the large-diameter piston; a mixture flow path of the mixture of the liquid pumped from the liquid flow path and the ambient air pumped from the ambient air flow path; and a mesh filter that is disposed in the mixture flow path to allow the mixture to pass, wherein 
     a connecting flow path area S 1  between the liquid flow path and the mixture flow path and a connecting flow path area S 2  between the ambient air flow path and the mixture flow path have the following relation:
 
2.85 ≤S   1   /S   2 ≤3.8
 
     (S 1 :S 2 =(2.8 to 3.8): 1) 
     In a preferred embodiment, the connecting flow path area S 1  and the connecting flow path area S 2  have the following relation:
 
 S   1   /S   2 =3.8
 
     (S 1 :S 2 =3.8:1) 
     In another preferred embodiment, a smallest flow path area S 3  of the mixture flow path is located on an immediately upstream side of the mesh filter, and the smallest flow path area S 3  and a flow path area S 4  of the mesh filter have the following relation:
 
4≤ S   4   /S   3 ≤10.3
 
     (1:4≤S 3 :S 4 ≤1:10.3) 
     (S 3 :S 4 =1:(4 to 10.3)) 
     Another aspect of the present disclosure resides in a foamer dispenser, including: a pump cover that is fitted to a container body; a pump cylinder that includes a large-diameter portion fixed to the pump cover and a small-diameter portion; a small-diameter piston that is received in the small-diameter portion of the pump cylinder and that is configured to suck and pump a liquid in the container body; a large-diameter piston that is received in the large-diameter portion of the pump cylinder and that is configured to suck and pump ambient air; a head that causes pumping movement of the small-diameter piston and the large-diameter piston and that ejects a mixture of the liquid and the ambient air by a user pushing and releasing the head repeatedly; a liquid flow path of the liquid pumped from the small-diameter piston; an ambient air flow path of the ambient air pumped from the large-diameter piston; a mixture flow path of the mixture of the liquid pumped from the liquid flow path and the ambient air pumped from the ambient air flow path; and a mesh filter that is disposed in the mixture flow path to allow the mixture to pass, wherein 
     a smallest flow path area S 3  of the mixture flow path is located on an immediately upstream side of the mesh filter, and the smallest flow path area S 3  and a flow path area S 4  of the mesh filter have the following relation:
 
4≤ S   4   /S   3 ≤10.3
 
     (1:4≤S 3 :S 4 ≤1:10.3) 
     (S 3 :S 4 1:(4 to 10.3)) 
     In a preferred embodiment, the smallest flow path area S 3  and the flow path area S 4  of the mesh filter have the following relation:
 
4 ≤S   4   /S   3 ≤10.1
 
     (1:4≤S 3 :S 4 ≤1:10.1) 
     (S 3 :S 4 =1:(4 to 10.1)) 
     In another preferred embodiment, the smallest flow path area S 3  and the flow path area S 4  of the mesh filter have the following relation:
 
4≤ S   4   /S   3 ≤6.2
 
     (1:4≤S 3 :S 4 ≤1:6.2) 
     (S 3 :S 4 =1:(4 to 6.2)) 
     In a more preferred embodiment, the smallest flow path area S 3  and the flow path area S 1  of the mesh filter have the following relation:
 
 S   4   /S   3 =4
 
     (S 3 :S 4 =1:4) 
     In yet another preferred embodiment, the mesh filter is arranged in 2 locations in the mixture flow path, and an interval L 1  between the smallest flow path area S 3  and the flow path area S 4  of the mesh filter and an interval L 2  between the mesh filters have the following relation:
 
 L   2   /L   1 =3.9
 
     (L 1 :L 2 =1:3.9) 
     In yet another preferred embodiment, the foamer dispenser further includes: a piston guide, inside of which the liquid flow path of the liquid pumped from the small-diameter piston is formed, and which extends throughout the large-diameter piston in a manner such that relative movement is permitted; and a jet ring, which includes a lower-end side concave portion in which an upper end side of the piston guide is received, an upper-end side concave portion in which the mesh filter is received, and a through path provided in a separation wall separating the lower-end side concave portion from the upper-end side concave portion, wherein an upper end side of the jet ring is connected to the head. 
     Yet another aspect of the present disclosure resides in a container with a foamer dispenser, including: the foamer dispenser according to any one of the above embodiments; and a container body to which the foamer dispenser is fitted. 
     Advantageous Effect 
     The present disclosure makes the foam quality of the ejected foam fine and uniform, thereby improving the appearance and texture when a user places the foam on the hand. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In the accompanying drawings: 
         FIG. 1  is a sectional view of a part of a container with a foamer dispenser according to one of embodiments of the present disclosure; 
         FIG. 2  is an enlarged view of an upper end portion of a piston guide of  FIG. 1 ; 
         FIG. 3  is an enlarged view of  FIG. 1 ; 
         FIG. 4  is a part view of a section of a jet ring in which a mesh ring is mounted; and 
         FIG. 5A  schematically illustrates the foam quality obtained when a content medium in a container body is ejected by using a conventional foamer dispenser, and 
         FIG. 5B  schematically illustrates the foam quality obtained when a content medium in a container body is ejected by using the foamer dispenser of  FIG. 1 . 
     
    
    
     DETAILED DESCRIPTION 
     The following describes a container with a foamer dispenser according to the present disclosure in detail with reference to the drawings. 
       FIGS. 1 to 4  illustrate a container with a foamer dispenser and a part thereof according to the present disclosure. In  FIG. 1 , reference numeral  20  denotes a synthetic resin container body including a mouth  21 . A liquid content medium is filled into an inner space S 0  of the container body  20  through the mouth  21 . In the present embodiment, the container body  20  is a container having a larger capacity than a capacity of a conventional container. 
     Reference numeral  1  denotes a foamer dispenser according to one of embodiments of the present disclosure. The foamer dispenser  1  is capable of ejecting a 3 cc of the content medium in the form of foam. 
     Reference numeral  2  denotes a synthetic resin pump cover. The pump cover  2  includes a fitting portion  2   a  to be fitted to the mouth  21  of the container body  20  and a neck  2   c  connected integrally with the fitting portion  2   a  via a shoulder  2   b . The neck  2   c  is provided, inside thereof, with a through path. The pump cover  2  may, for example, be provided with a screw portion on an inner circumferential surface of the fitting portion  2   a  as illustrated in the figure and be detachably fitted to the container body  20  by screwing the screw portion to a screw portion provided on an outer circumferential surface of the mouth  21  of the container body  20 . 
     Reference numeral  3  denotes a synthetic resin pump cylinder. The pump cylinder  3  includes a large-diameter portion  3   a  fixed to the pump cover  2  and a small-diameter portion  3   b  having a smaller diameter than the large-diameter portion  3   a . The small-diameter portion  3   b  is provided in a lower end portion thereof with a suction port, and a tube  4  is connected to the suction port. When the pump cover  2  is fitted to the mouth  21  of the container body  20 , the pump cylinder  3  is positioned in the inner space S 0  through the mouth  21  of the container body  20  as illustrated in the figure. In the illustrated example, an upper end of the large-diameter portion  3   a  of the pump cylinder  3  is formed as an outward annular flange  3   c . Between the annular flange  3   c  and an upper end of the mouth  21  of the container body  20 , an O-ring  5  is disposed. The O-ring seals between the container body  20  and the pump cylinder  3 . 
     Reference numeral  6  denotes a synthetic resin small-diameter piston. The small-diameter piston  6  is received in the small-diameter portion  3   b  of the pump cylinder  3  and configured to suck and pump the content medium in the container body  20 . In the present embodiment, the small-diameter piston  6  includes an annular seal portion  6   a , which is slidable on an inner circumferential surface of the small-diameter portion  3   b  of the pump cylinder  3 , and a tubular portion  6   c , which extends from the annular seal portion  6   a  toward the large-diameter portion  3   a  of the pump cylinder  3 . The tubular portion  6   c  is provided on an inner side thereof with a through path R o  which is open in an upper end portion  6   b  of the small-diameter piston  6 . In the present embodiment, the upper end portion  6   b  of the small-diameter piston  6  is connected to the tubular body  6   c  via an annular step  6   d . Accordingly, a step is also formed in the through path R o  due to the annular step  6   d , and an inner diameter of an upper end opening formed in the upper end portion  6   b  is smaller than a lower end opening formed on an inner side of the annular seal portion  6   a.    
     Reference numeral  7  denotes a synthetic resin plunger. The plunger  7  extends upward inside the pump cylinder  3  from the small-diameter portion  3   b  to the large-diameter portion  3   a  of the pump cylinder  3  and also extends throughout the small-diameter piston  6 . 
     In the present embodiment, a plurality of fins  7   d  is disposed at an interval about an axis O in a lower end portion  7   a  of the plunger  7 . Furthermore, a plurality of fins  3   d  is disposed at an interval about the axis O in the small-diameter portion  3   b  of the pump cylinder  3 . The plunger  7  is arranged in the small-diameter portion  3   b  of the pump cylinder  3  in a manner such that the fins  7   d  of the plunger  7  are alternated with the fins  3   d  of the pump cylinder  3 . 
     On the other hand, an upper end portion  7   b  of the plunger  7  includes a conical portion  7   c  having a diameter increased upward. The conical portion  7   c  of the plunger  7  is formed larger than the inner diameter of the opening formed in the upper end portion  6   b  of the small-diameter piston  6 . As described earlier, the upper end portion  6   b  of the small-diameter piston  6  is reduced in diameter via the annular step  6   d . The conical portion  7   c  of the plunger  7  may be brought into contact with the upper end portion  6   b  of the small-diameter piston  6  by forcedly extracting the opening formed in the upper end portion  6   b . That is to say, by the conical portion  7   c  of the plunger  7  contacting the upper end portion  6   b  of the small-diameter piston  6 , the upper end opening formed in the upper end portion  6   b  may be sealed in an operable manner. As a result, a pump chamber S L , is formed in the small-diameter portion  3   b  of the pump cylinder  3 . The content medium, after pressurized in the small-diameter piston  6 , is pumped out from the pump chamber S L  by releasing of the plunger  7 . 
     Reference numeral  8  denotes an elastic member that may be deformed and restored. The elastic member  8  is disposed between the plunger  7  and the small-diameter piston  6  in a compressed state. Accordingly, by pressing the upper end opening of the small-diameter piston  6  against the outer circumferential surface of the conical portion  7   c  of the plunger  7 , the elastic member  8  firmly seals the through path R o  of the small-diameter piston  6  in an openable manner. That is to say, the plunger  7  serves, only when the small-diameter piston  6  is pushed down against elastic force of the elastic member  8 , as a suction valve (check valve) configured to open the through path R o  of the small-diameter piston  6 . In the present embodiment, the elastic member  8  is formed by a metallic or a synthetic resin spring. 
     Reference numeral  9  denotes a synthetic resin large-diameter piston. The large-diameter piston  9  has a diameter that is larger than the diameter of the small-diameter piston  6 . The large-diameter piston  9  is received in the large-diameter portion  3   a  of the pump cylinder  3  and configured to suck and pump ambient air. In the present embodiment, the large-diameter piston  9  includes an annular seal portion  9   a , which is slidable on an inner circumferential surface of the large-diameter portion  3   a  of the pump cylinder  3 , and a tubular portion  9   b , which extends upward from the annular seal portion  9   a  via an annular wall  9   c . The tubular portion  9   b  is provided, inside thereof, with a through path. 
     The annular wall  9   c  of the large-diameter piston  9  is provided with a plurality of ambient air introduction holes  9   n  arranged at an interval about the axis O. The ambient air introduction holes  9   n  allow ambient air, after introduced through an ambient air introduction hole  3   n  formed in the large-diameter portion  3   a  of the pump cylinder  3 , to be introduced to an air pump chamber S air  formed between the large-diameter piston  9  and the large-diameter portion  3   a  of the pump cylinder  3 . 
     Reference numeral  10  denotes a check valve configured to open and close the ambient air introduction holes  9   n  provided in the large-diameter piston  9 . When the large-diameter piston  9  is pushed in and the air pump chamber S air  is compressed, the check valve  10  closes the ambient air introduction holes  9   n  of the large-diameter piston  9  to prevent outflow of ambient air, and when the pushing of the large-diameter piston  9  is released and the air pump chamber S air  is expanded, the check valve  10  opens the ambient air introduction holes  9   n  of the large-diameter piston  9  by the negative pressure in the air pump chamber S air  to allow ambient air to be introduced through the ambient air introduction hole  3   n  of the pump cylinder  3 . Examples of the check valve  10  include an elastic valve made of a synthetic resin. 
     Reference numeral  11  denotes a synthetic resin piston guide. The piston guide  11  is provided inside thereof with a liquid flow path R L  of the content medium pumped from the small-diameter piston  6  and extends throughout the large-diameter piston  9  in a manner such that relative movement is permitted. In the present embodiment, the piston guide  11  includes a fixed tube  11   a , which is fixed to an outer circumferential surface of the tubular portion  6   c  of the small-diameter piston  6  and a tubular portion  11   c , which extends upward from the fixed tube  11   a  toward the neck  2   c  of the pump cover  2 . In the present embodiment, the tubular portion  11   c  of the piston guide  11  is connected to the fixed tube  11   a  via an annular step  11   d . The above structure allows positioning of the small-diameter piston  6  by bringing the annular step  6   d  into abutment against the annular step lid of the piston guide  11 . 
     The piston guide  11  is also provided inside thereof with a partition wall  11   w  located below an upper end  11   b  of the piston guide  11 . In the partition wall  11   w  of the piston guide, a tubular portion  11   h  is provided. As illustrated in  FIG. 2 , the through path formed on an inner side of the tubular portion  11   h  is defined by a constant-diameter inner circumferential surface  11   f   1  extending from the lower end with a constant diameter and an increased-diameter inner circumferential surface  11   f   2  connected to the constant-diameter inner circumferential surface  11   f   1  with a diameter increasing toward the upper end. 
     Furthermore, in the present embodiment, as illustrated in  FIG. 2 , the tubular portion  11   c  is provided, on an inner circumferential surface thereof, with a plurality of protruding ridges  11   r  extending toward the lower end from the partition wall  11   w . In the present embodiment, the protruding ridge  11   r  is arranged in 6 locations at an interval about the axis O. However, the protruding ridge  11   r  may be arranged in at least one location. 
     Reference numeral  12  denotes a metallic or a synthetic resin ball member. The ball member  12  rests on the increased-diameter inner circumferential surface  11   f   2  of the tubular portion  11   h  provided in the piston guide  11  to seal the inner side of the tubular portion  11   h  in an openable manner. 
     Reference numeral  13  denotes a synthetic resin slip-off preventing member configured to prevent the ball member  12  from slipping out. The slip-off preventing member  13  is fixed to the inner circumferential surface of the piston guide  11  that is located near the upper end  11   b  to form space in which the ball member  12  is received. The slip-off preventing member  13 , together with the piston guide  11 , forms an opening port A 1  on an inner side of the upper end  11   b  of the piston guide  11 . The opening port A 1  serves to open the liquid flow path R L  provided in the piston guide  11 . 
     In the present embodiment, the slip-off preventing member  13  includes a circumferential wall  13   a , which is fixed between the inner circumferential surface of the piston guide  11  that is located near the upper end  11   b  and the tubular portion  11   h , a ceiling wall  13   b  located above the ball member  12 , and a plurality of connecting pieces  13   c  connected to the ceiling wall  13   b  and the circumferential wall  13   a . The connecting pieces  13   c  are arranged at an interval about the axis O, so that a plurality of apertures A 0  are formed between adjacent connecting pieces  13   c . For example, 3 apertures A 0  may be formed. In the present embodiment, a tubular portion  13   d  extends upward from and is integrated with an outer edge of the ceiling wall  13   b . The above structure forms the annular opening port A 1  extending around the axis O on the inner side of the upper end  11   b  of the piston guide  11  and between the upper end  11   b  and the tubular  13   d . That is to say, in the present embodiment, the opening port A 1  of the liquid flow path R L  forms an annular flow path area S 1  defined by the upper end  11   b  of the piston guide  11  and the tubular portion  13   d  of the slip-off preventing member  13 . 
     In this way, in the liquid flow path R L  provided inside the piston guide  11  in the present embodiment, the annular opening port A 1  formed in the upper end  11   b  of the piston guide  11  is opened and closed by the ball member  12 . That is to say, the ball member  12  serves as a discharge valve (check valve) that, only when the plunger  7  is released and the content medium is pumped to the liquid flow path R L  of the piston guide  11 , opens the annular opening port A 1  formed in the upper end  11   b  of the piston guide  11 . Especially in the present embodiment, the liquid flow path R L  formed between the plunger  7  and the ball member  12  also serves as an accumulator that pressurizes the content medium, after pumped from the small-diameter piston  6 , to a predetermined pressure and pump the pressurized content medium. 
     As illustrated in  FIG. 3 , the tubular portion  11   c  of the piston guide  11  extends throughout the inner side of the tubular portion  9   b  of the large-diameter piston  9 . Between the tubular portion  11   c  of the piston guide  11  and the tubular portion  9   b  of the large-diameter piston  9 , a gap is formed to allow relative movement in the direction of the axis O. 
     Besides, the tubular portion  11   c  of the piston guide  11  is provided with a plurality of annular protrusions  11   c  extending around the axis O. Each annular protrusion  11   e  is provided, on an upper side thereof, with an annular groove  11   g  extending around the axis O. A lower end portion  9   d  of the tubular portion  9   b  of the large-diameter piston  9  may be brought into contact with the annular groove  11   g . With the above structure, when the lower end portion  9   d  of the tubular portion  9   b  of the large-diameter piston  9  comes off the annular groove  11   g  of the piston guide  11  and the contact is released, the air pump chamber S air , which is formed between the large-diameter piston  9  and the large-diameter portion  3   a  of the pump cylinder  3 , is brought into communication with the gap formed between the tubular portion  11   c  of the piston guide  11  and the tubular portion  9   b  of the large-diameter piston  9 . That is to say, the tubular portion  9   b  of the large-diameter piston  9  and the annular groove  11   g  of the piston guide  11  serve as an opening/closing valve, and the gap serves as the first ambient air path R air  for the ambient air which has been pumped from the large-diameter piston  9 . 
     In the present embodiment, a plurality of protruding ridges  11   k  are provided at an interval about the axis O on an outer circumferential surface of the tubular portion  11   c  of the piston guide  11 . In the present embodiment, the protruding ridge  11   k  is arranged in 12 locations at an interval about the axis O. The protruding ridges  11   k  guide ambient air without contacting the tubular portion  9   b  of the large-diameter piston  9 . Additionally, the protruding ridge  11   r  may be arranged in at least one location. 
     In the present embodiment, an annular cutout extending around the axis O is further formed in an upper end of each annular protruding portion  11   e . In the cut-out, a plurality of guide walls  11   j  are provided at an interval about the axis O, and a plurality of receiving portions C 3 , configured to prevent inflow of foreign substances, is also provided between adjacent guide walls  11   j . The guide walls  11   j  are arranged to be aligned with the protruding ridge  11   k . That is to say, in the present embodiment, the guide wall  11   j  is also arranged in 12 locations at an interval about the axis O. However, the guide wall  11   j  may also be arranged in at least one location. 
     Reference numeral  14  denotes a synthetic resin jet ring. As illustrated in  FIG. 4 , the jet ring  14  includes a lower-end side concave portion C 1 , in which the upper end  11   b  side of the piston guide  11  is received, an upper-end side concave portion C 2 , in which two mesh rings  15  which are described later are received, and a separation wall  14   a , which separates the lower-end side concave portion C 1  from the upper-end side concave portion C 2  and is provided with a through path. In the present embodiment, the separation wall  14   a  is formed as a circumferential wall that connects a lower-end side circumferential wall  14   b , which surrounds the upper end  11   b  side of the piston guide  11 , and an upper-end side circumferential wall  14   c , which surrounds the two mesh rings  15 . 
     In more detail, the separation wall  14   a  is formed by the first reduced circumferential wall portion  14   a   1 , which is connected to the lower-end side circumferential wall  14   b  and has an inner diameter smaller than the smaller inner diameter of the lower-end side circumferential wall  14   b , a same-diameter circumferential wall portion  14   a   2 , which has the same inner diameter as the first reduced circumferential wall portion  14   a   1 , the second reduced circumferential wall portion  14   a   3 , which has an inner diameter smaller than that of the same-diameter circumferential wall portion  14   a   2 , a large-diameter circumferential wall portion  14   a   4 , which has a diameter increased from the second reduced circumferential wall portion  14   a   3  to the upper end, and the third reduced circumferential wall portion  14   a   5 , which, together with the large-diameter circumferential wall portion  14   a   4 , is connected to the upper-end side circumferential wall  14   c  and which has an inner diameter smaller than that of the upper-end side circumferential wall  14   c.    
     Especially in the present embodiment, a plurality of reinforcing plates  14   a   6  is provided at an interval about the axis O between the first reduced circumferential wall portion  14   a   1  and the third reduced circumferential wall portion  14   a   5 . The reinforcing plate  14   a   6  may be arranged in 4 locations at an equal interval about the axis O. The result is that the separation wall  14   a  is formed as a waist, and the amount of resin used in the jet ring  14  is reduced. Moreover, the mesh ring  15  may be enlarged, and the amount of foam to be dispensed is increased. However, reinforcing plate  14   a   6  may be arranged in at least one location. 
     Furthermore, an annular bulging portion  14   p  extending around the axis O is provided on an inner circumferential surface  14   f   1  of the lower-end side circumferential wall  14   b  of the jet ring  14 . The bulging portion  14   p  forms, on an inner side of the lower-end side circumferential wall  14   b , an inner circumferential surface  14   f   2  having an inner diameter smaller than that of the inner circumferential surface  14   f   1 . In the present embodiment, the inner diameter of the bulging portion  14   p  is defined as the smallest inner diameter of the lower-end side circumferential wall  14   b . Besides, in the lower-end side concave portion C 1  of the jet ring  14 , a plurality of L-shaped grooves  14   g  is formed to extend from the bulging portion  14   p  to the first reduced circumferential wall portion  14   a   1  of the separation wall  14   a . In the present embodiment, the L-shaped groove  14   g  is arranged in 12 locations at an interval about the axis O. However, the L-shaped groove  14   g  may be arranged in at least one location. 
     Reference numeral  15  denotes the mesh ring that is received in the upper-end side concave portion of the jet ring  14 . The mesh ring  15  includes a mesh filter  15   a . The mesh filter  15   a  is a member formed with fine apertures through which the content medium may pass and is, for example, a resin net. The mesh filter  15   a  is fixed to an end of a synthetic resin ring member  15   b . The ring member  15   b , together with the mesh filter  15   a , is fitted and held inside the upper-end side concave portion C 2  of the jet ring  14 . 
     As illustrated in  FIG. 3 , the jet ring  14  receives the upper end  11   b  side of the piston guide  11 , with the upper end  11   b  of the piston guide  11  abutting against the first reduced circumferential wall portion  14   a   1  and with the outer circumferential surface of the tubular portion  11   c  of the piston guide  11  fitted to an inner circumferential surface f 2  of the bulging portion  14   p  provided in the lower-end side circumferential wall  14   b . This allows the opening port A 1  of the piston guide  11  to communicate with the upper-end side concave portion C 2  of the jet ring  14  through the through path provided in the separation wall  14   a  of the jet ring  14 . 
     Furthermore, since in the present embodiment the L-shaped grooves  14   g  are formed to extend from the bulging portion  14   p  of the jet ring  14  to the first reduced circumferential wall portion  14   a   1  of the separation wall  14   a , the second ambient air flow paths R air  are formed between the piston guide  11  and the jet ring  14 . The second ambient air flow paths allow the ambient air that has been pumped from the large-diameter piston  9  to communicate with the through path provided in the separation wall  14   a  of the jet ring  14 . In the present embodiment, 12 second ambient air flow paths R air , defined by the L-shaped grooves  14   g  of the jet ring  14  and the piston guide  11 , are formed. That is to say, in the present embodiment, an opening port A 2  of the second ambient air flow paths R air  has a flow path area S 2  defined by the L-shaped grooves  14   g  formed in the first reduced circumferential wall portion  14   a   1  of the separation wall  14   a  of the jet ring  14  and the upper end  11   b  of the piston guide  11 . Additionally, the second ambient air flow path R air  may be arranged in at least one location. 
     In the present embodiment, the inner circumferential surface  14   f   1  of the lower-end side circumferential wall  14   b  of the jet ring  14  is sealed and slidably held by an upper end portion  9   e  of the tubular portion  9   b  of the large-diameter piston  9 . This allows the second ambient air flow paths R air  to communicate with the first ambient air flow paths R air  in an air-tight manner. 
     The through path provided in the separation wall  14   a  forms the first mixture flow path R M  for a mixture of the content medium pumped from the opening port A 1  of the liquid flow path R L  and the ambient air pumped from the opening port A 2  of the second ambient air flow paths R air . In the present embodiment, in a portion of the first mixture flow path R M  that is located on the inner side of the of the same-diameter circumferential wall  14   a   2  of the jet ring  14 , the tubular portion  13   d  of the slip-off preventing member  13  may be received. This enlarged path, in which the tubular portion  13   d  of the slip-off preventing member  13  is received, extends from the smallest inner diameter path formed on the inner side of the second reduced circumferential wall portion  14   a   3  to the large-diameter circumferential wall portion  14   a   4  and to the curved path formed on the inner side of the third reduced circumferential wall portion  14   a   5  and then, communicates with the second mixture flow path R M  formed on the inner side of the ring member  15   b  of the mesh ring  15 . 
     Next, reference numeral  16  in  FIG. 3  denotes a synthetic resin head. By a user pushing and releasing the head  16  repeatedly, the head  16  causes pumping movement of the small-diameter piston  6  and the large-diameter piston  9  and ejects the mixture of the content medium and ambient air. In the present embodiment, the head  16  includes a ceiling wall  16   a , on which the user performs a pushing operation, and a fixing tube  16   b  suspended from the ceiling wall  16   a . Inside the fixing tube  16   b , the upper-end side circumferential wall  14   c  of the jet ring  14  is fitted and held. The head  16  further includes a nozzle  16   c  communicating with the inside of the fixing tube  16   b . As illustrated in  FIG. 1 , the nozzle  16   c  is provided in a front end thereof with an ejection orifice  1   a  from which the content medium, after passing through the mesh rings  15 , is ejected in the form of foam. 
     Furthermore, the ceiling wall  16   a  of the head  16  is provided in a lower end thereof with a plurality of fixing ribs  16   r  extending radially around the fixing tube  16   b . In the lower end of the ceiling wall  16   a  of the head  16 , an outer tube  16   d  as a separate member is also disposed. In the present embodiment, the outer tube  16   d  may receive the fixing ribs  16   r  on the inner side of the outer tube  16   d  and may be fixed by the fixing ribs  16   r.    
     In  FIG. 1 , reference numeral  17  denotes a stopper configured to prevent the head  16  form pushed down. The stopper  17  is an existing stopper that is arranged detachably between the shoulder  2   c  of the pump cover  2  and the outer tube  16   d  of the head  16 . That is to say, the stopper  17  includes two curved arms  17   c  extending, in a C-shape in the cross section, from a base  17   b  having a grip  17   a , thereby detachably fitted to the neck  2   c  of the pump cover  2 . Thus, the stopper  17  contacts the upper end of the shoulder  2   c  and the lower end of the outer tube  16   d  and prevents the head  16  from pushed down. 
     The large container with a foamer dispenser according to the present disclosure allows a large volume of content medium, after pumped from the container body  20 , to pass through the mesh filters  15   a  and ejects the content medium in the form of foam by repeated pushing and releasing of the head  16 . 
     In the present embodiment, as illustrated in  FIG. 3 , a connecting flow path area S 1  between the liquid flow path R L  and the mixture flow path R M  and a connecting flow path area S 2  between the ambient air flow path R air  and the mixture flow path R M  are defined, and the connecting flow path area S 1  for the liquid and the connecting flow path area S 2  for ambient air satisfy the following condition.
 
2.8 ≤S   1   /S   2 ≤3.8  (1)
 
     (2.8:1≤S 1 :S 2 ≤3.8:1) 
     More preferably, the connecting flow path area S 1  for the liquid and the connecting flow path area S 2  for ambient air are set to satisfy the following condition.
 
 S   1   /S   2 =3.8  (2)
 
     (S 1 :S 2 =3.8:1) 
     Furthermore, in the present embodiment, in a through path formed inside the jet ring  14 , the same-diameter circumferential wall portion  14   a   2  has the smallest inner diameter. That is to say, the smallest flow path area S 3  of the mixture flow path R M  is located on an immediately upstream side of one of the mesh filters  15   a . In this case, the smallest flow path area S 3  of the mixture flow path R M  and a flow path area S 4  of the mesh filter  15   a  are preferably set to satisfy the following condition.
 
4≤ S   4   /S   3 ≤10.3  (3)
 
     (1:4≤S 3 :S 4 ≤1:10.3) 
     Preferably, the smallest flow path area S 3  of the mixture flow path R M  and the flow path area S 4  of the mesh filter  15   a  are set to satisfy the following condition.
 
4≤ S   4   /S   3 ≤6.2  (4)
 
     (1:4≤S 3 :S 4 ≤1:10.1) 
     More preferably, the smallest flow path area S 3  of the mixture flow path R M  and the flow path area S 4  of the mesh filter  15   a  are set to satisfy the following condition.
 
4≤ S   4   /S   3 ≤6.2  (5)
 
     (1:4≤S 3 :S 4 ≤1:6.2) 
     Even more preferably, the smallest flow path area S 3  of the mixture flow path R M  and the flow path area S 4  of the mesh filter  15   a  are set to satisfy the following condition.
 
 S   4   /S   3 =4  (6)
 
     (S 3 :S 4 =1:4) 
     Moreover, in the present embodiment, the mesh filter  15   a  is arranged in two locations in the mixture flow path R M . In this case, an interval L 1  between the smallest flow path area S 3  of the mixture flow path R M  and the flow path area S 4  of the mesh filter  15   a  and an interval L 2  between the mesh filters  15   a  are preferably set to satisfy the following condition.
 
 L   2   /L   1 =3.9  (7)
 
     (L 1 :L 2 =1:3.9) 
     Moreover, the foamer dispenser of the present embodiment includes the piston guide  11 , inside of which the liquid flow path R L  of the content medium pumped from the small-diameter piston  6  is formed, and which extends throughout the large-diameter piston  9  in a manner such that relative movement is permitted, and the jet ring  14 , which includes the lower-end side concave portion C 1  in which the upper end  11   b  side of the piston guide  11  is received, the upper-end side concave portion C 2  in which the mesh filters  15   a  are received, and the through path provided in the separation wall  14   a  separating the lower-end side concave portion C 1  from the upper-end side concave portion C 2 . 
     Furthermore, the annular bulging portion  14   p  is provided on the inner circumferential surface of the lower-end side concave portion C 1  of the jet ring  14 , the upper end  11   b  of the piston guide  11  is abutted against the separation wall  14   a  of the jet ring  14 , the piston guide  11  is fitted to the inner side of the bulging portion  14   p , and the inner diameter surface of the lower-end side concave portion C 1  of the jet ring  14  is sealed slidably by the large-diameter piston  9 . 
     Moreover, the plurality of L-shaped grooves  14   g  is formed to extend from the bulging portion  14   p  to the separation wall  14   a  of the jet ring  14  to form the plurality of ambient air flow paths R air  between the piston guide  11  and the jet ring  14 . The ambient air flow paths allow the ambient air that has been pumped from the large-diameter piston  9  to communicate with the lower-end side concave portion C 1  of the jet ring  14 . The ambient air flow paths R air , together with the liquid flow path R L  of the piston guide  11 , are connected to the through path of the separation wall  14   a.    
     Moreover, the upper end  11   b  side of the jet ring  14  is connected to the head  16 . 
     Using an assembly of the piston guide  11  and the jet ring  14  according to the present embodiment facilitates settings of the connecting flow path area S 1  for the liquid and the connecting flow path area S 2  for ambient air. For example, as illustrated in  FIG. 2 , the connecting flow path area S 1  for the liquid is defined between the upper end  11   b  of the piston guide  11  and the tubular portion  13   d  of the slip-off preventing member  13 . Accordingly, the connecting flow path area S 1  for the liquid may be suitably changed simply by changing an inner diameter of the upper end  11   b  of the piston guide  11  and an outer diameter of (the tubular portion  13   d  of) the slip-off preventing member  13 . Moreover, the connecting flow path area S 2  for ambient air is defined by the L-shaped grooves  14   g  of the jet ring  14  illustrated in  FIG. 4 , and accordingly, the connecting flow path area S 2  may be suitably changed simply by changing the width and depth of the L-shaped grooves  14   g.    
     Next, another embodiment of the present disclosure is described. This other embodiment is also directed to the foamer dispenser with the structure illustrated in  FIGS. 1 to 4  in which the same-diameter circumferential wall portion  14   a   2  has the smallest inner diameter in the through path formed inside the jet ring  14 . That is to say, the smallest flow path area S 3  of the mixture flow path R M  is located on an immediately upstream side of one of the mesh filters  15   a . The smallest flow path area S 3  of the mixture flow path R M  and a flow path area S 4  of the mesh filter  15   a  are preferably set to satisfy the aforementioned condition (3). Thus, in the foamer dispenser with the structure illustrated in  FIGS. 1 to 4  according to the other embodiment of the present disclosure, the smallest flow path area S 3  of the mixture flow path R M  is located on an immediately upstream side of one of the mesh filters  15   a , and the smallest flow path area S 3  and the flow path area S 4  of the mesh filter  15   a  are preferably set to satisfy the same condition as the condition (3). 
     In this other embodiment also, in addition to the condition (3), the aforementioned conditions (4) to (7) are preferably satisfied. Furthermore, in addition to the condition (3), the aforementioned conditions (1) and (2) may also be satisfied. 
     The following describes test results of Examples using a foamer dispenser with the structure illustrated in  FIGS. 1 to 4  and Comparative Examples. The tests were conducted by using a body soap (skin cleanser) with ingredients of Table 1 shown below as the content medium of Examples and Comparative Examples. 
     
       
         
           
               
               
             
               
                 TABLE 1 
               
               
                   
               
               
                 Ingredients 
                 Mass % 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
            
               
                 Sodium laurylaminopropionate 
                 3 
               
               
                 Lauramidopropyl betaine 
                 20 
               
               
                 Sodium N-cocoyl methyl taurate 
                 2 
               
               
                 Polyoxyethylene (2) disodium alkyl (12-14) sulfosuccinate 
                 10 
               
               
                 Sorbitol 
                 3 
               
               
                 Glycerin 
                 3 
               
               
                 Proplylene glycol 
                 20 
               
               
                 Sodium benzoate 
                 0.9 
               
               
                 Citrate 
                 0.7 
               
               
                 Honey 
                 0.1 
               
               
                 Sodium DL-pyrrolidone carboxylate solution 
                 0.1 
               
               
                 Dye 
                 0.01 
               
               
                 Purified water 
                 Reminder 
               
               
                   
               
            
           
         
       
     
     Example 1 
         S   1   /S   2(all) =3.8 
     (S 1 :S 2(all) =3.8:1) 
     Connecting flow path area S 1  for the liquid=27.3 mm 2    
     Connecting flow path area S 2  for ambient air=7.2 mm 2    
     Note that the connecting flow path area S 2  herein refers to a total sum area S 2  of 12 connecting flow paths for ambient air. 
     Example 2 
         S   1   /S   2(all)= 2.8 
     (S 1 :S 2(all) =2.8:1) 
     Connecting flow path area S 1  for the liquid=20.16 mm 2    
     Connecting flow path area S 2  for ambient air=7.2 mm 2    
     Note that the connecting flow path area S 2  herein refers to a total sum area S 2  of 12 connecting flow paths for ambient air. 
     Example 3 
         S   4   /S   3 =4 
     (S 3 :S 4 =1:4) 
     Smallest flow path area S 3  of mixture flow path R M =24.63 mm 2    
     Flow path area S 4  of mesh filter=98.52 mm 2    
     Example 4 
         S   4   /S   3 =4.2 
     (S 3 :S 4 =1:4.2) 
     Smallest flow path area S 3  of mixture flow path R M =23.76 mm 2    
     Flow path area S 4  of mesh filter=98.52 mm 2    
     Example 5 
         S   4   /S   3 =6.2 
     (S 3 :S 4 =1:6.2) 
     Smallest flow path area S 3  of mixture flow path R M =15.89 mm 2    
     Flow path area S 4  of mesh filter=98.52 mm 2    
     Example 6 
         S   4   /S   3 =10 
     (S 3 :S 4 =1:10) 
     Smallest flow path area S 3  of mixture flow path R M =9.85 mm 2    
     Flow path area S 4  of mesh filter=98.52 mm 2    
     Example 7 
         S   4   /S   3 =10.3 
     (S 3 :S 4 =1:10.3) 
     Smallest flow path area S 3  of mixture flow path R M =9.57 mm 2    
     Flow path area S 4  of mesh filter=98.52 mm 2    
     In the following, test results of the aforementioned Examples 1 to 7 according to the present disclosure are shown in Table 2. In Table 2, “good” indicates that the foam quality is good, and “excellent” indicates that the foam quality is better than good. 
     
       
         
           
               
               
             
               
                   
                 TABLE 2 
               
               
                   
                   
               
               
                   
                 Foam quality 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
            
               
                   
                 Example 1 
                 Excellent 
               
               
                   
                 Example 2 
                 Good 
               
               
                   
                 Example 3 
                 Excellent 
               
               
                   
                 Example 4 
                 Good 
               
               
                   
                 Example 5 
                 Good 
               
               
                   
                 Example 6 
                 Good 
               
               
                   
                 Example 7 
                 Good 
               
               
                   
                   
               
            
           
         
       
     
     It can be clearly seen from Examples 1 and 2 in Table 2 shown above that the foam quality of the ejected foam may be improved by setting the connecting flow path area S 1  for the liquid and the connecting flow path area S 2  for ambient air to satisfy the aforementioned condition (1). Especially, as can be clearly seen from Example 1, the foam quality is better when the aforementioned condition (2) is satisfied. 
     It can also be clearly seen from Examples 3 to 7 in Table 2 shown above that the foam quality of the ejected foam may be improved by setting the smallest flow path area S 3  of the mixture flow path R M  and the flow path area S 4  of the mesh filter to satisfy the aforementioned conditions (3) to (6). Especially, as can be clearly seen from Example 3, the foam quality is better when the condition (6) is satisfied. In cases of Examples 3 to 7, in which the smallest flow path area S 3  of the mixture flow path R M  and the flow path area S 4  of the mesh filter are set to satisfy the conditions (3) to (6), even when a large volume is ejected from the head, the head may be pushed down with feeling of lightness, as opposed to heaviness. 
     In eases in which Example 1 and Example 3 were combined, the foam quality was also better. 
     Furthermore, regarding Examples 1 to 7, when the interval L 1  between the smallest flow path area S 3  and the flow path area S 4  of the mesh filter was set to be 3.8 mm and when the interval L 2  between the mesh filters was set to be 15 mm and 
     when the dimension settings of L 1 :L 2 =3.9 were combined with Example 1 or Example 3, the foam quality was even more than better. Moreover, when the above dimension settings were combined with Example 1 and Example 3, the foam quality was best. The foam quality obtained in this case is schematically illustrated in  FIG. 5B . As illustrated in  FIG. 5B , according to the present disclosure, the small air bubbles B 1  are evenly dispersed in the single piece of foam F compared with conventional example illustrated in  FIG. 5A . 
     Additionally, although Examples use the jet ring of a type that may form the liquid flow path R L  and the air flow path R air  at the time of assembly, the present disclosure may also be adopted in a foamer dispenser using the jet ring of a conventional type that may form only the liquid flow path R L . 
     INDUSTRIAL APPLICABILITY 
     The present disclosure is applicable to a foamer dispenser that mixes a liquid content medium and ambient air and ejects the mixture in the form of foam and to a container with the foamer dispenser. The content medium may be anything, such as a face cleanser and a hair liquid, that may be mixed with ambient air and ejected in the form of foam. 
     REFERENCE SIGNS LIST 
     
         
         
           
               1  Foamer Dispenser 
               2  pump cover 
               3  pump cylinder 
               3   a  large-diameter portion 
               3   b  small-diameter portion 
               6  small-diameter piston 
               7  elastic member 
               8  large-diameter piston 
               9  piston guide 
               11  ball member 
               12  slip-off preventing member 
               13   d  tubular portion 
               14  jet ring 
               14   a  separation wall 
               14   a   1  first reduced circumferential wall portion 
               14   a   2  same-diameter circumferential wall portion 
               14   a   3  second reduced circumferential wall portion 
               14   a   4  large-diameter circumferential wall portion 
               14   a   5  third reduced circumferential wall portion 
               14   a   6  reinforcing plate 
               14   g  L-shaped groove 
               15  mesh ring 
               15   a  mesh filter 
               20  container body 
               21  mouth 
             A 1  opening port of liquid flow path 
             A 2  opening port of ambient air flow path 
             C 1  lower-end side concave portion of jet ring 
             C 2  upper-end side concave portion of jet ring 
             R L  liquid flow path 
             R air  ambient air flow path 
             R M  mixture flow channel 
             S 1  connecting flow path area between liquid flow path and mixture flow path 
             S 2  connecting flow path area between ambient air flow path and mixture flow 
             path 
             S 3  smallest flow path area of mixture flow path 
             S 4  flow path area of mesh filter