JP2002002886A - Beer tap with bubble forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent beer bubbles from being adhered and left at a beer feeding- out passage and an inner wall surface of a discharging pipe while creamy well- bubbled bubbles are being applied on a liquid surface of beer poured into a cup from a beer tap provided with a bubble feeding-out device and further prevent bubbles from being produced when the beer is fed out. SOLUTION: An opening 58 of small diameter is opened at a location positioned upstream side of a valve 51 at a large diameter part 50 installed at a rear end of a plug rod 5 fitted in a body 40 of a beer tap. A bubble flow passage 6 communicating with the opening is arranged inside the plug rod 5. The bubble flow passage 6 is guided to the front end of the body 40 under a state in which the bubble flow passage 6 is shut off from a beer flow passage 44 and a discharging pipe 43 within the body 40. It is communicating with a bubble feeding-out pipe 45 arranged at the body separate from the discharging pipe 43. A bubble extracting valve mechanism (w) opening the valve under a rearward turning of a handle lever 42 is arranged at a starting end or an intermediate part or a rear end of the bubble flow passage 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foam for pouring beer into a fine foam at a dispenser outlet for dispensing beer from a container such as a barrel into a cup such as a mug. The present invention relates to improvement of a beer dispenser (beer cock) of a beer dispenser equipped with a dispensing device.

[0002]

2. Description of the Related Art A beer dispenser (or beer server) A used for pouring draft beer packed in a cask in a beer hall or the like into a cup such as a mug or the like and providing it to a customer is usually provided with a diagram. As shown in FIG. 1, for example, on the upper half side 1a of the inside of a box-shaped body 1 formed so as to be able to be placed on a counter B or the like of a store,
A refrigerator 2 provided with a water tank 10 surrounded by a heat insulating material and installed in the lower half 1b of the body 1 in the water tank 10.
The cooling water in the water tank 10 is maintained at a temperature near zero degree by installing the refrigerant evaporator 20 of the above, and in the cooling water, the cooling water is installed at a place away from the body 1 of the beer dispenser A. The end portion 31 of the beer line 30 for guiding the beer from the container 3 filled with beer such as a storage keg.
Is wound in a serpentine tube and disposed at the end 3 of the line 30.
1 is connected to the inlet pipe 41 on the base end side of the body 40 of the beer cock 4 which is attached to the front side (the left side in the figure) of the body 1, and the upper surface of the body 40 of the beer cock 4 The body 4 of the cylindrical beer cock 4 is provided with a handle lever 42 that rotates between an upright posture, a forwardly inclined position, and a rearwardly inclined position.
0, the operation of the handle lever 42 causes
A valve mechanism that switches between a state in which the beer is discharged from the discharge pipe 43 provided on the lower surface side of the body 40, a state in which the beer is finely foamed, and a state in which the beer is discharged from the discharge pipe 43, and a state in which the beer is stopped. It is composed by storing it.

[0003] Thus, a container 3 such as a keg filled with beer.
Then, the pressure of the pressurized carbon dioxide gas is supplied from a carbon dioxide gas cylinder 32 placed separately beside the container 3, and in this state, the handle lever 42 of the beer cock 4 is tilted forward, Beer is poured out of the discharge pipe 43 into a cup C such as a mug disposed below the discharge pipe 43, and when the level reaches a reference level in the cup C, the handle lever 42 is returned to an upright posture and the beer is discharged. By stopping the pouring and then tilting the handle lever 42 backward, the beer is discharged as a fine foam from the discharge pipe 43 and poured onto the liquid level of the beer in the cup C. I have.

A valve mechanism provided in the body 40 of the beer cock 4 for discharging and stopping the beer and discharging the beer into fine bubbles and stopping the beer are shown in FIG. As shown, the stopper rod 5 that slides back and forth by the front and rear rotation operation of the handle lever 42 is stored in the body 40, and the peripheral edge of the front end face of the large diameter portion 50 formed at the rear end side thereof. A valve 51 formed in a ring shape with an elastic material such as synthetic rubber is attached to the portion, and a valve seat 52 that abuts on the valve 51 is connected to an enlarged diameter inlet formed on the rear end side of the flow path 44 in the body 40. When the handle lever 42 is set upright on the inclined wall surface on the front end side of the inner wall surface of the pipe 41,
The stopper rod 5 connected to this occupies the state position shown in FIG. 2, and the valve 51 abuts the valve seat 52 to block the flow path 44 in the body 40 communicating with the discharge pipe 43, and Is stopped, the handle lever 42 is tilted forward and rotated as shown in FIG. 3 and the stopper rod 5 is tilted backward, and the valve 51 is separated from the valve seat 52 to open the beer flow path 44, and the beer is discharged. Discharge pipe 4
3 and the outer body 500 of the large diameter portion 50 holding the valve 51 at the rear end of the plug 5 is formed separately from the rear end 53 of the plug main body 5a. Then, the outer body 500 of the large-diameter portion 50 can be freely inserted into and removed from the rear end 53 of the plug body 5a, and the outer periphery of the large-diameter portion 50 is stored by the spring 56 stored in the large-diameter portion 50. The body 500 is connected to the plug rod body 5a so as to be pushed forward with respect to the plug rod body 5a, and thereby provided on the front end face of the outer peripheral body 500 of the large diameter portion 50 of the plug rod 5 as shown in FIG. Valve 51 is valve seat 5
When the handle lever 42 is tilted and turned rearward from the state where the large diameter portion 50 is stopped so as not to move forward, the outer periphery of the large diameter portion 50 as shown in FIG. The plug body 5a moves forward, leaving the body 500 in a position where the valve 51 held by the valve 51 abuts against the valve seat 52, and the rear end 53 of the body 500 is the outer body of the large diameter portion 50. Make sure to get out of the front of 500.

[0005] A small-diameter hole 54 that opens in the circumferential direction is formed in the rear end 53 of the plug rod body 5a that is extracted from the outer casing 500 of the large-diameter portion 50. 5
(a) A spring lock nut screwed to the rear end of the rear end portion 53 so as to receive a spring 56 for pushing the large diameter portion 50 forward through a small-diameter passage 55 to be opened in the rear end portion 53. 57
The small-diameter opening 58 is opened. In addition, the stopper rod body 5a has a hole 5 formed in the rear end portion 53 described above.
A valve body 5b that expands in an umbrella-like shape around the four circumferences is provided at a position that is located forward of 6, and the rear end 53 of the plug body 5a is retracted into the large-diameter portion 50 by a spring 56. In the state shown in FIG. 3, the peripheral portion of the umbrella-shaped valve body 5b abuts against the front surface of the ring-shaped valve 51 provided on the outer body 500 of the large-diameter portion 50 to form the hole 54. From the flow path 44.

As shown in FIG. 5, when the handle lever 42 is tilted backward and the stopper rod body 5a is moved forward, beer flows from the small-diameter opening 58 through the small-diameter flow path 55 through the hole 54. The liquid is ejected in the form of fine bubbles and discharged to the discharge pipe 43 through the flow path 44.

[0007]

The beer cock with a foaming device provided in the beer dispenser according to the above-mentioned conventional one has a flow path inside a body of the beer cock and an inner surface of a discharge pipe. When the beer has been cleaned, the beer cock can be operated by operating the handle lever so that the beer is first poured into the cup without foaming, and then the foam is poured onto the liquid surface of the beer. However, when beer is poured into many cups one after another, bubbles gradually adhere to the flow path in the body and the inner surface of the discharge pipe, and when the next beer is poured into the cup, the bubbles are removed. There is a problem that the beer becomes foamy and the beer is foamed, so that the beer cannot be poured neatly to the standard level.

[0008] In addition, beer drinkers prefer foams with good foam retention because the foam on the liquid level of the beer suppresses the foaming of carbonic acid in the beer and improves the taste of the beer. In the foaming device incorporated in the beer cock, the small-diameter hole for beer foaming is made as small as possible,
Since the generated foam is made into a creamy form with extremely fine foam particles, the fine foam easily adheres to the flow path in the body and the inner wall surface of the discharge pipe and remains easily. Even if the inside is thoroughly cleaned, the above-mentioned obstacles will soon occur due to use.

The present invention has been made in order to solve this problem which has occurred in the conventional means, and a creamy cream having good foam retention is provided on the liquid level of beer poured into a cup from a beer cock with a foaming device. New beer is added so that the foam does not adhere to the inner wall surface of the beer pouring channel and the discharge pipe and remains when the beer is subsequently poured out. It is intended to provide a simple means.

[0010]

In the present invention, as means for achieving the above-mentioned object, an inlet pipe 41 is provided at the rear end side of a cylindrical body 40, and an upright pipe is provided at an upper surface side. Handle lever 4 so as to be freely rotatable between an inclined position, a forward inclined position, and a backward inclined position.
2, a discharge pipe 43 communicating with an inlet pipe 41 through a flow passage 44 in the body 40 bore is provided on the lower surface side, and the front end side is provided with a discharge pipe 43 in front and rear of the body 40 lumen. A plug rod 5 provided with a piston-like sliding portion 5c which is slidably fitted on the rear end and a large-diameter portion 50 having a diameter larger than the flow path 44 at the rear end side.
Is slidably fitted back and forth, and the sliding portion 5c of the plug bar 5 is fitted.
Is connected to the lower end of the handle lever 42 so that the large-diameter portion 5
0, a ring-shaped valve 51 made of an elastic material is provided on the front end face,
In the beer cock 4 in which a valve seat 52 corresponding to the valve 51 is provided at the front end of the inner wall surface of the inlet pipe 41, the body 4
A small-diameter opening 58 is opened in a portion of the large-diameter portion 50 provided on the rear end side of the plug rod 5 fitted in the cylinder 0 at a position upstream of the valve 51, and a bubble flow communicating with the small-diameter opening 58 is provided. The passage 6 is provided inside the stopper rod 5, and guided to the front end side of the body 40 in a state where the foam passage 6 is cut off from the beer passage 44 and the discharge pipe 43 in the body 40. 43 and a foam discharge pipe 45 provided in the body 40 separately from the handle lever 42 at the start end, middle, or end of the flow path 6 for foam.
A beer cock with a foaming device, characterized in that a valve mechanism w for foam extraction is provided which is opened by turning backward.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A beer cock 4 with a foaming device according to the present invention basically has a body 4 formed of a resin material or a metal material into a cylindrical shape, as shown in FIG.
0, an inlet pipe 41 formed at the rear end side (base end side) of the body 40 with a diameter larger than the body of the body 40, and a spherical bearing 420 at a position close to the front end on the upper surface side of the body 40. Handle lever 42 mounted to be tilted and rotated from an upright position to a forward tilted position and a rearward tilted position
The handle lever 42 is slidably fitted back and forth along the axial direction in the body 40, and moves back and forth in the body 40 by the tilting of the handle lever 42 back and forth.
And a discharge pipe 43 which is vertically provided on the lower surface side of the body of the body 40 and communicates with the lumen of the inlet pipe 41 as a flow path 44, and A large diameter portion 50 is formed on the rear end side of the stopper rod 5, and a valve 51 is formed on its front end surface in a ring shape with an elastic material such as a synthetic rubber material.
And a valve seat 52 corresponding to the valve 51 is connected to the inlet pipe 4.
1 is formed on the inclined wall surface at the front end of the lumen, whereby the handle lever 42 is in an upright posture as shown in FIG.
To the discharge pipe 43, and the handle lever 4
8, the stopper rod 5 is pushed rearward to open the space between the valve 51 and the valve seat 52, and the inlet pipe 41 and the discharge pipe 43 flow. The state in which the communication is established via the road 44 may be configured in the same manner as the conventional beer cock 4 shown in FIGS. 1 and 2 and 3 described above.

As shown in FIG. 10, the beer cock 4 is mounted on a counter B in a store such as a beer hall by a mounting portion provided around an inlet pipe 41 on the base end side of the body 40 of the beer cock 4. Beer server A to be placed on top
And the inlet pipe 41 on the base end side of the body 40 is connected to the end side of the beer line 30 disposed inside the fuselage 1 of the beer server A, and the beer line 30 is connected. It is connected to a container 3 filled with beer to be installed at a desired place in the store, and the pressure of carbon dioxide gas is supplied to the container 3 from a carbon dioxide gas cylinder 32. In this state, the discharge pipe of the beer cock 4 Mug C below 43
When the handle lever 42 is tilted forward as shown in FIG. 8, the beer is poured out from the discharge pipe 43, the hand is released from the handle lever 42, and the handle lever 42 is restored to an upright posture by a restoring spring. Then, as shown in FIG. 6, the valve 51 abuts on the valve seat 52 to stop the beer from being poured out, similarly to the conventional means.

The beer cock 4 having the above-described structure is adapted to allow the beer guided to the inlet pipe 41 by the operation of inclining and turning the handle lever 42 of the beer cock 4 backward, so that the beer cock 5
Is discharged through a small-diameter opening 58 provided on the rear surface side of the large-diameter portion 50 on the rear end side to generate fine foam bubbles, and the valve 51 that closes this foam is closed. And the valve seat 52 is discharged at a position beyond the discharge pipe 43. At this time, the generated foam does not flow out to the discharge pipe 43, and the foam is injected into the front end side of the body 40 which has passed the discharge pipe 43 forward. The outlet pipe 45 is provided separately, and is allowed to flow out of the foam outlet pipe 45.

For this reason, the plug rod 5 inserted into the body 40 is provided with a bubble flow path 6 communicating with the small-diameter opening 58 formed in the large-diameter portion 50 of the plug rod 5. It is formed inside and shuts off from the flow path 44 of beer, and the foam flow path 6 leads the body 40 to a foam discharge pipe 45 provided separately in parallel with the discharge pipe 43. .

A valve mechanism w for extracting foam is provided at an intermediate portion or an end portion of the foam channel 6 so as to be opened by the operation of tilting the handle lever 42 backward. Thus, the foam generated by the opening 58 can be discharged from the foam discharge pipe 45 into the jug C without contacting the inner wall surface of the flow path 44 for beer discharge and the inner wall surface of the discharge pipe 43.

At this time, as shown in FIG. 6, the foam flow path 6 is provided at a position which is located as close to the shaft core as possible within the stopper rod 5 until it passes over the discharge pipe 43. In the region leading to the piston-like sliding portion 5c on the front end side of the plug rod 5 which is slidably fitted to the front end side of the body 40 which has passed the front portion 43, the outer peripheral surface of the sliding portion 5c and the body 40 may be formed between the inner peripheral surface and the inner peripheral surface.

Further, the valve mechanism w provided at the middle or at the end of the foam passage 6 is provided with a foam passage 6 formed in the rear half 6a formed inside the stopper rod 5 and a front end side of the stopper rod 5 at the front end side. When formed by the front half 6b formed on the peripheral surface of the sliding portion 5c, a small-diameter opening 60 is opened at the front end of the rear half 6a of the bubble flow path 6, and this opening 60 A foam valve 61 which communicates with the first half 6b of the flow channel 6 and which moves forward and backward with respect to the opening 60 is formed in a disk shape with an elastic material such as synthetic rubber, and is arranged in front of the opening 60. This foam valve 61 is formed into a hollow piston-like shape in the bore of the piston-like sliding portion 5c of the plug rod 5 as shown in FIGS. 11 and 12, and is slid back and forth with respect to the sliding portion 5c. Slide member 7 fitted to fit
Is held integrally on the rear end side, and the movement of the slide member 7 with respect to the sliding portion 5c causes the bubble valve 61 to open the opening 6.
0, the slide member 7
The lower end of the handle lever 42 is connected to the sliding member 5c, and the sliding member 7 is urged by a spring 70 interposed between the sliding member 5c so as to be pushed rearward against the sliding portion 5c. Accordingly, when the handle lever 42 is in the upright posture as shown in FIG.
When the handle lever 42 is tilted rearward and rearward as shown in FIG. 9 when the handlebar 42 is tilted rearward as shown in FIG.
2 is stopped forward by the abutment with the valve 2, and the slide member 7 fitted in the slide portion 5 c of the plug 5 moves forward, so that the bubble valve 61 is connected to the valve port. The valve is separated from the opening 60 so that the valve is closed.

With this configuration, the valve mechanism w
When the valve is opened, foam is discharged from the opening 60 serving as a valve port, and the foam is discharged from the foam discharge pipe 45 through the first half 6 b of the foam flow path 6.
It will be poured into a jug C which is arranged below it.

When the handle lever 42 is tilted forward so as to pour beer into the mug C, the stopper rod 5 is pushed rearward, and when the beer valve 51 is pulled rearward from the valve seat 52, the slide member 7 is turned off. By being pushed rearward by the spring 70, the valve mechanism w is maintained in a closed state.

As shown in FIG. 13, the valve mechanism w has a large-diameter portion 50 having an outer casing 500 formed separately from the rear end 53 of the plug body 5a, and the rear end of the plug body 5a. The valve 53 is made of an elastic material, and is fitted to the outer periphery of the portion 53 so as to be slidable in the front-rear direction. The valve 61 is opened in a spring stopper 57 screwed to the rear end 53 of the plug body 5a so as to receive a spring 56 that pushes the envelope 500 toward the plug body 5a. Small opening 58
The opening 58 serving as a valve port may be separated from the valve 61 and opened by the rearward inclination of the handle lever 42.

In this case, a valve mechanism w for extracting bubbles is provided at the start end of the bubble flow path 6 communicating with the small-diameter opening 58.

In this case, the sliding portion 5c provided on the front end side of the stopper rod 5 is provided with a sliding member 7 stored therein.
May be omitted, and may be directly connected to the lower end side of the handle lever 42.

The valve mechanism w has a slide member 7 provided in a bore of the sliding portion 5c of the plug 5 and a narrow groove formed on a fitting surface between an outer peripheral surface thereof and an inner peripheral surface of the sliding portion 5c. In the case where the terminal side 6b of the bubble channel 6 is provided, as shown in FIGS. 14 and 15, the valve 61 facing the opening 63 of the terminal side 6b of the bubble channel 6 is provided with a sliding member. 7, it is provided on the end side of the flow path 6 for foam.

[0024]

As described above, in the beer cock with a foaming device according to the present invention, the handle lever is tilted backward and rotated so that fine bubbles are poured out in a state in which beer discharge is stopped. In this state, the foam is discharged from a foam discharge pipe provided in the body separately from the beer discharge feeling in a state where the foam is shut off from the beer discharge flow path and the inner wall surface of the discharge pipe. Therefore, even if the foam is creamy and discharged as extremely fine foam particles, it does not adhere to the inner wall surface of the beer flow path and the discharge pipe and remains, and the beer is not affected by the foam. In this state, the beer can be poured neatly into a mug or a glass to a predetermined level, and a creamy foam can be poured on the liquid level of the beer.

[Brief description of the drawings]

FIG. 1 is an overall explanatory view of a beer server equipped with a beer cock with a foaming device.

FIG. 2 is a partially cutaway side view of the beer cock.

FIG. 3 is a partially longitudinal side view showing a state in which the handle lever is tilted and rotated forward;

FIG. 4 is a longitudinal sectional view of the same part.

FIG. 5 is a partially broken side view of the same handle lever in a state in which the handle lever is tilted rearward and rearward.

FIG. 6 is a partially cutaway side view of a beer cock embodying the present invention.

FIG. 7 is a front view of the same.

FIG. 8 is a partially broken side view of the same handle lever in a state where the handle lever is tilted forward and rotated.

FIG. 9 is a partially cutaway side view of the same handle lever in a state in which the handle lever is tilted and rotated backward.

FIG. 10 is an explanatory view of the whole beer server to which the above-mentioned beer cock is assembled.

FIG. 11 is a vertical sectional side view of a tap bar of the beer cock according to the first embodiment.

FIG. 12 is a longitudinal rear view of the plug rod according to the embodiment, taken along the line II.

FIG. 13 is a longitudinal sectional side view of a stopper rod of another embodiment of the beer cock.

FIG. 14 is a longitudinal sectional view of another example of the valve mechanism for bubbles of the beer cock of the above.

FIG. 15 is a vertical sectional side view of the valve mechanism in an open state.

[Explanation of symbols]

A: beer dispenser (beer server), B: counter, C: cup (jug), w: valve mechanism, 1 ...
Airframe, 1a: Upper half, 1b: Lower half, 10: Water tank, 2 ...
Refrigerator, 20 refrigerant evaporator, 3 container, 30 beer line, 31 end side, 32 cylinder, 4 beer cock, 40 body, 400 bearing, 41 inlet pipe, 42
... handle lever, 43 ... discharge tube, 44 ... flow path, 45 ...
Bubble discharge pipe, 5 ... stopper rod, 5a ... stopper rod body, 5c ... sliding part,
Reference numeral 50: large diameter portion, 500: enclosure, 51: valve, 52: valve seat, 53: rear end portion, 54: small diameter hole, 55: flow path (passage), 56: spring, 57: spring locking nut 58, a small-diameter opening, 6: a flow path for foam, 6a, a rear half (start end), 6b
... first half side (end side), 60 ... small-diameter opening, 61 ... bubble valve, 62 ... valve holding fitting, 63 ... opening, 7 ... slide member, 70 ... spring.

Claims (4)

[Claims] 1. An inlet pipe 41 is provided at a rear end side of a cylindrical body 40, and a handle is switched on an upper surface side between an upright posture, a forwardly inclined posture, and a rearwardly inclined posture. A lever 42 is provided, and a discharge pipe 43 communicating with the inlet pipe 41 through a flow path 44 in the body 40 is provided on the lower surface side. A stopper rod 5 provided with a piston-like sliding portion 5c which is slidably fitted back and forth, and a stopper rod 5 provided with a large-diameter portion 50 having a diameter larger than the flow path 44 at the rear end side is slidably fitted back and forth. The sliding portion 5c of the plug 5 is connected to the lower end of the handle lever 42, and a ring-shaped valve 51 made of an elastic material is provided on the front end surface of the large-diameter portion 50. Valve seat 52
In the beer cock 4 installed at the front end of the inner wall surface of the inlet pipe 41, the upstream side of the valve 51 of the large-diameter portion 50 installed at the rear end side of the plug 5 fitted in the body 40. A small-diameter opening 58 is opened at a position located at a position, and a foam flow path 6 communicating with the opening 58 is provided inside the stopper rod 5, and the foam flow path 6 is provided.
Flow path 44 for beer in body 40 and discharge pipe 43
In the state of being cut off from the
A bubble extraction valve which is communicated with a foam discharge pipe 45 provided in the body 40 separately from the discharge pipe 43 and is opened at the start end, middle or end of the foam flow path 6 by turning the handle lever 42 backward. A beer cock provided with a foaming device, comprising a mechanism w. 2. A piston-like sliding portion 5c provided on the front end side of a plug rod 5 fitted into a body 40 is formed in a hollow shape.
A small-diameter opening 60 provided in the cavity at the intermediate portion of the foam channel 6
And a slide member 7 is fitted in the bore of the sliding portion 5c so as to be slidable in the front-rear direction with respect to the sliding portion 5c, and is connected to the lower end side of the handle lever 42 so that the sliding member 7 A bubble valve 6 facing the opening 60 at the rear end face
2. A valve mechanism w for discharging foam is provided by attaching the foam valve 1 to the foam valve 61 and the opening 60.
A beer cock with the described foaming device. 3. A piston-like sliding portion 5c provided on the front end side of the plug rod 5 fitted into the body 40 is formed in a hollow shape, and a slide member 7 is provided in the inner cavity of the sliding portion 5c. On the other hand, the slide member 7 is slidably fitted back and forth, and the slide member 7 is connected to the lower end side of the handle lever 42, and the end side 6
b is formed on the fitting surface between the outer peripheral surface of the slide member 7 and the sliding portion 5c, and slides on the end side 6b of the bubble flow path 6 so as to correspond to the opening 60 and the opening 60. Member 7
Valve mechanism w for foam, comprising a foam valve 61 to be held
2. The beer cock with a foaming device according to claim 1, wherein the valve is opened by the forward movement of the slide member 7 due to the rearward inclination of the handle lever 42. 4. A large-diameter portion 50 provided on the rear end side of the stopper rod 5.
Of the plug rod body 5a is formed separately from the rear end 53 of the plug rod body 5a.
Is fitted slidably in the front-rear direction with the rear end 53 of the plug rod body 5a, and the spring stopper 5 is screwed into the rear end 53.
7 is urged to be pushed out toward the plug body 5a by a spring 56 interposed therebetween.
Is opened and communicated with the foam flow path 6, and a valve 61 opposed thereto is provided behind the opening 58 by being held by a valve holding fitting 62 provided on the outer enclosure 500 of the large diameter portion 50. ,
2. The beer cock with a foaming device according to claim 1, wherein the valve 61 and the opening 58 serve as a valve mechanism w for opening and closing the foam channel 6.