JP6034677B2 - Foam dispenser - Google Patents

Description

  The present invention relates to a foam dispenser.

  As a foam discharger, a cylinder member in which a large-diameter air cylinder and a small-diameter liquid cylinder are connected concentrically up and down, and a liquid piston sliding inside the liquid cylinder project from the lower part of the outer periphery of the stem. A pneumatic piston that slides in the pneumatic cylinder is linked to the upper part of the outer periphery of the stem, and an operating member mounted on the upper end of the stem so as to be movable up and down in an upward biased state. A configuration is known in which the liquid in the liquid cylinder and the air in the air cylinder are merged by vertical movement to be bubbled through a foaming member and discharged from the discharge port of the discharge head. (For example, see Patent Document 1)

  The bubble discharge device described in Patent Document 1 includes an outside air introduction valve for introducing outside air into an air cylinder that decreases as bubbles are discharged. This outside air introduction valve is an air piston. Is formed by assembling a valve member composed of a separate member.

JP 2009-202122 A

  In this type of conventional foam dispenser, the separate valve member is formed of a soft material in order to exhibit functionality, but liquid adhesion, in particular, cosmetics contained in this type of foam dispenser. Since the valve member is provided in the partition wall crossing the air cylinder, the discharge liquid may enter the valve member from the intake port through the operating member. When the liquid enters, the outside air introduction valve member swells and deforms, which may impair the valve function.

  The present invention has been made in view of the above points, and even if liquid enters the valve member portion, the valve member constituting the outside air introduction valve can be prevented from swelling and deformation of the valve member is prevented as much as possible. As a result, the present invention proposes a foam dispenser that can exhibit a good valve function, has a simple structure, and can be formed by applying some structural changes to conventional products.

The first means is configured as follows. That is, the upper end is fixed to the mounting cap A to be fitted to the outer periphery of the mouth / neck portion 101 of the container body 100 and hangs down in the container body 100, and the large-diameter air cylinder 20 and the small-diameter liquid cylinder 21 are moved up and down. A cylinder member B concentrically connected to the liquid cylinder 21 and a liquid piston C1 that slides in the liquid cylinder 21 project from the lower outer periphery of the stem C2 and an air piston that slides in the air cylinder 20 C3 is linked to the upper part of the outer periphery of the stem C2, and the discharge head C5 is fitted to the upper end of the stem C2 so as to be movable up and down in the upward biased state. A bubble discharger configured to cause liquid from the inside of the cylinder 21 and air from the inside of the cylinder 20 to join together to foam through the foaming member C7 and to be discharged from the discharge port 65 of the discharge head C5.
A cylindrical member 45 in which the air piston C3 is fitted to the outer periphery of the stem C2 so as to be movable up and down by a predetermined width, and a sliding portion 47 in which the air piston 20 is slidably fitted to the inner periphery of the air cylinder 20; It is configured by connecting with partition walls 46 that partition the upper and lower sides of the air cylinder 20,
An outside air introduction valve V3 constituted by an annular outside air introduction valve body 56 projecting from a mounting cylinder 55 fitted on the outer periphery of the tubular member 45 and an outside air introduction valve valve seat 48 provided at the lower part of the partition wall 46. 46 is closed so that it can be opened and closed.
An anti-swelling mechanism for preventing the mounting cylinder 55 from swelling by locking at least the upper outer surface of the mounting cylinder 55 in a state where ventilation between the intake port 49 and the outside air introduction valve V3 is possible.

The second means is configured as follows. That is, in the first means, a hanging wall portion 46a is formed in the inner peripheral portion of the partition wall 46, an intake port 49 is opened in the partition wall 46 inside the hanging wall portion 46a, and the level is lowered by the hanging wall portion 46a. The lower surface of the partition wall 46 is configured as a valve seat 48 for an outside air introduction valve, and an outer peripheral edge portion of an annular outside air introduction valve body 56 projecting from a mounting cylinder 55 fitted at a position opposed to the hanging wall portion 46a is used for the outside air introduction valve. The outside air introduction valve V3 is configured to be in pressure contact with the valve seat 48, and the ring body 57 that prevents the mounting cylinder 55 from swelling as a swelling prevention mechanism is in a state in which ventilation between the intake port 49 and the outside air introduction valve V3 is possible. The mounting cylinder 55 is fitted to at least the upper outer surface.

  The third means was configured as follows. That is, in the second means, as a swelling prevention mechanism, a plurality of locking plates 50 in the circumferential direction project from the inner surface of the hanging wall portion 46a facing the mounting cylinder 55, and the inner surface of each locking plate 50 is a ring. The body 57 was fitted to the outer surface, and the intake port 49 and the outside air introduction valve V3 were communicated with each other through the locking plates 50.

The fourth means is configured as follows. That is, in the second means, as a swelling prevention mechanism, the ring body 57 is fitted between the mounting cylinder 55 and the hanging wall portion 46a, and the ventilation groove 57a is vertically formed in the outer peripheral portion of the ring body 57. The intake port 49 and the outside air introduction valve V3 are communicated with each other through the ventilation groove 57a.

The fifth means is configured as follows. That is, in the first means, a hanging wall portion 46a is formed in the inner peripheral portion of the partition wall 46, an intake port 49 is opened in the partition wall 46 inside the hanging wall portion 46a, and the level is lowered by the hanging wall portion 46a. The lower surface of the partition wall 46 is configured as a valve seat 48 for an outside air introduction valve, and an outer peripheral edge portion of an annular outside air introduction valve body 56 projecting from a mounting cylinder 55 fitted at a position opposed to the hanging wall portion 46a is used for the outside air introduction valve. An outside air introduction valve V3 is configured by pressure contact with the valve seat 48, and a locking projection 51 for preventing the mounting cylinder 55 from swelling is integrally projected from the partition wall 46 as a bulge prevention mechanism.

  The sixth means is configured as follows. That is, in the fifth means, the locking protrusions 51 are locking protrusions 51 that are provided in a plurality of circumferential directions at an annular position on the back surface of the partition wall 46.

  According to the present invention, since the anti-swelling mechanism for preventing the mounting cylinder 55 from swelling is provided, even if liquid enters the outside air introduction valve member constituting the outside air introduction valve, the outside air introduction valve member C4 Swelling can be suppressed and deformation of the outside air introduction valve member can be prevented as much as possible. As a result, a good valve function can be exhibited over a long period of time.

The wall 46a is formed in the inner peripheral part of the partition 46, the inlet port 49 is opened in the partition 46 inside the suspension 46a, and the lower surface of the partition 46 level-down by the wall 46a is used as a valve for the outside air introduction valve. An outside air introduction valve is configured by pressing an outer peripheral edge of an annular outside air introduction valve body 56 formed on the seat 48 and projecting from a mounting cylinder 55 fitted at a position opposite to the hanging wall portion 46a to a valve seat 48 for the outside air introduction valve. A ring body 57 configured to prevent the swelling of the mounting cylinder 55 is fitted to the outer surface of the mounting cylinder 55 in a state in which the air can be passed between the intake port 49 and the outside air introduction valve V3. the case, an extremely simple structure that the ring member 57, by suppressing swelling of the outside air introduction valve member C4, can be prevented as much as possible the deformation of the outside air introduction valve member C4, a good valve function over a long period It can be demonstrated.

  As a swelling prevention mechanism, a plurality of locking plates 50 in the circumferential direction are projected from the inner surface of the hanging wall portion 46a facing the mounting cylinder 55, and the inner surfaces of the locking plates 50 are fitted to the outer surface of the ring body 57. When the intake port 49 and the outside air introduction valve V3 are communicated with each other through the plates 50, the outside air introduction valve member can be reliably locked by the respective locking plates 50 so that the ring body 57 is shifted outward. C4 swelling can be prevented more reliably.

As a swelling prevention mechanism, the ring body 57 is fitted between the mounting cylinder 55 and the hanging wall portion 46a, and a ventilation groove 57a is provided vertically on the outer peripheral portion of the ring body 57, and the ventilation groove 57a is interposed therebetween. When the intake port 49 and the outside air introduction valve V3 are communicated with each other, the ring body 57 has a very simple structure to suppress the outside air introduction valve member C4 from swelling and prevent the outside air introduction valve member C4 from being deformed as much as possible. Can do.

The wall 46a is formed in the inner peripheral part of the partition 46, the inlet port 49 is opened in the partition 46 inside the suspension 46a, and the lower surface of the partition 46 level-down by the wall 46a is used as a valve for the outside air introduction valve. An outside air introduction valve is configured by pressing an outer peripheral edge of an annular outside air introduction valve body 56 formed on the seat 48 and projecting from a mounting cylinder 55 fitted at a position opposite to the hanging wall portion 46a to a valve seat 48 for the outside air introduction valve. When the locking projection 51 that constitutes V3 and prevents the swelling of the mounting cylinder 55 as a bulge prevention mechanism is integrally projected from the partition wall 46, the locking projection formed integrally with the air cylinder 20 With a simple structure of 51, it is possible to suppress the swelling of the outside air introduction valve member C4 and to prevent the outside air introduction valve member from being deformed as much as possible. As a result, a good valve function can be exhibited over a long period of time.

  When the locking protrusions 51 are locking protrusions 51 provided in a plurality of circumferential positions at the annular position on the back surface of the partition wall 46, the locking protrusions 51 are also simply formed integrally with the air cylinder 20. With the structure, a good valve function can be exhibited over a long period of time, and there is also an advantage that the outside air introduction valve member C4 can be assembled more easily.

It is a longitudinal cross-sectional view of a foam discharger. (First embodiment) It is a principal part expanded sectional view of the part enclosed by the dashed-two dotted line x of FIG. (First embodiment) It is a principal part expanded sectional view of the external air introduction valve part of a foam discharger. (Second embodiment) It is a longitudinal cross-sectional view of a foam discharger. (Third embodiment) It is a principal part expanded sectional view of the part enclosed by the dashed-two dotted line y of FIG. (Third embodiment)

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 show a first embodiment of the foam dispenser of the present invention. The foam discharger 1 includes a mounting cap A, a cylinder member B, an operating member C, and a poppet valve body D.

  The mounting cap A is for fixing the foam discharger 1 to the container body 100, and a flange-like top wall 11 is extended from the upper end edge of the peripheral wall 10 to be fitted to the outer periphery of the mouth neck portion 101 of the container body 100. The guide tube 12 is erected at the edge of the window hole opened at the center of the top wall 11. The lower end of the guide tube 12 slightly protrudes downward from the top wall 11.

  The cylinder member B has a small-diameter liquid cylinder 21 concentrically extending below a large-diameter air cylinder 20 whose upper end is fixedly attached to the outer periphery of the back surface of the mounting cap A. The liquid cylinder 21 is connected to the inner peripheral edge of the bottom wall portion of the air cylinder 20 with the upper edge of the peripheral wall portion hanging downward, and extends from the lower end edge of the peripheral wall portion to a tapered bottom wall portion that opens at the center. The upper surface of the bottom wall portion is configured as a valve seat 22 for the suction valve. Further, the pipe fitting cylinder 23 is integrally suspended from the central opening edge of the bottom wall portion, and the upper end of the suction pipe 24 is fitted into the pipe fitting cylinder 23, and the lower end thereof is the lower end portion in the container body 100. Is hanging down. Further, a plurality of locking ribs 25 in the circumferential direction are projected from the bottom wall portion outer edge portion of the liquid cylinder 21 to the lower end portion of the peripheral wall portion. An upward stepped portion is provided at an upper and lower intermediate portion of each locking rib 25.

  The actuating member C is assembled to the cylinder member B so as to be vertically movable in an upwardly biased state. The actuating member C is a liquid piston C1, a stem C2, an air piston C3, an outside air introduction valve member C4, and a discharge head. C5, the mounting cylinder member C6, and the foaming member C7 are provided.

  The liquid piston C1 has an upper and lower skirt-shaped sliding portion 31 projecting outward from the outer periphery of the lower end of the fitting cylinder portion 30 fitted to the lower portion of the stem C2, and the sliding portion 31 is connected to the inner periphery of the liquid cylinder 21. Are fitted in a liquid-tight slidable manner. Further, the upper end portion of the fitting cylinder portion 30 forms a valve seat 32 for a check valve in the form of a ridge at an intermediate portion in the vertical direction in the stem C2. A coil spring s is interposed between the lower surface of the fitting cylinder portion 30 of the liquid piston C1 and the upward step portion of each locking rib 25 to constantly urge the operating member C upward.

  The stem C2 has a cylindrical shape with open upper and lower ends, and a liquid piston C1 that slides on the liquid cylinder 21 protrudes from the outer periphery of the lower portion, and an air piston C3 that slides in the air cylinder 20 has an outer periphery. In cooperation with the upper part, the liquid cylinder 21 and the air cylinder 20 are mounted so as to move up and down. A valve seat 35 for a discharge valve is formed in the upper part of the stem C2, and a discharge valve V1 is formed by a ball-shaped discharge valve body 36 placed on the valve seat. A plurality of vertical ridges 37 in the circumferential direction project from the lower surface of the valve seat 35 for the discharge valve to directly above the valve seat 32 for the check valve. Furthermore, a valve seat 38 for an air discharge valve that restricts and locks the lowering of the air piston C3 is projected from an intermediate portion in the vertical direction of the outer surface. A plurality of vertical ridges 39 project in the circumferential direction on the outer periphery of the cylindrical wall above the valve seat 38 for the air discharge valve.

The air piston C3 is a cylinder for air through a step-shaped partition wall 46 extending from the outer periphery of the cylindrical member 45 by fitting the cylindrical member 45 of the inner peripheral edge to the outer periphery of the stem C2 so as to be movable in a small width. An upper and lower skirt-shaped sliding portion 47 is provided on the inner periphery of 20 so as to be slidable in a liquid-tight manner. The cylindrical member 45 is fitted to the outer surface of the vertical protrusion 39 on the outer periphery of the stem C2 so as to be movable up and down, and its upper end is slidably fitted to the inner circumference of a seal cylinder portion 66 of the discharge head C5 described later. Further, the lower end portion and the valve seat 38 for the air discharge valve constitute an air discharge valve V2.

  The air piston C3 has a stem C2 of the cylindrical member 45 from the state in which the upper surface of the partition wall 46 contacts the lower surface of the guide cylinder 12 to the state in which the lower end of the cylindrical member 45 contacts the valve seat 38 for the air discharge valve. It is possible to move up and down relatively.

The outside air introduction valve member C4 includes a mounting cylinder 55 fitted on the outer periphery of the cylindrical member 45, and an annular outside air introduction valve member C4 projecting from the mounting cylinder 55. The outside air introduction valve body 56 and the partition wall 46 are disposed below the partition wall 46. An outside air introduction valve V3 is constituted by the provided valve seat 48 for the outside air introduction valve. The outside air introduction valve V3 closes the intake port 49 provided in the partition wall 46 so as to be openable and closable. In the first embodiment, a hanging wall portion 46a is formed on the inner peripheral portion of the partition wall 46, an intake port 49 is opened in the partition wall 46 inside the hanging wall portion 46a, and the lower surface of the partition wall 46 is lowered by the hanging wall portion 46a. The valve seat 48 for the outside air introduction valve is configured. Further, the outer peripheral edge of the plate-like outside air introduction valve body 56 is pressed against the valve seat 48 for the outside air introduction valve in an annular shape projecting from the lower outer periphery of the mounting cylinder 55 fitted to the position opposite to the hanging wall portion 46a. An outside air introduction valve V3 is configured.

In the present invention, an anti-swelling mechanism for preventing the mounting cylinder 55 from swelling by locking at least the upper outer surface of the mounting cylinder 55 in a state where the air inlet 49 and the outside air introduction valve V3 can be vented is provided.

In the first embodiment, as an anti-swelling mechanism, a ring body 57 that prevents swelling of the mounting cylinder 55 is fitted to at least the upper outer surface of the mounting cylinder 55, and the inner surface of the vertical wall portion 46a that faces the mounting cylinder 55 A plurality of locking plates 50 are provided in a more circumferential direction, the inner surfaces of the locking plates 50 are engaged with the outer surface of the ring body 57, and the intake port 49 and the outside air introduction valve V3 are connected between the locking plates 50. Communicate. As the material constituting the ring body 57, a material that does not swell due to the liquid or a material that does not swell due to the liquid is preferably used. However, as in the first embodiment, the material is sandwiched between the locking plates 50. May be a material with some swelling. As a specific material of the ring body 57, a synthetic resin, particularly an ethylene polymer resin is suitable. However, a metal or the like may be employed, and is not limited thereto.

In the first embodiment, the ring body 57 and the locking plate 50 are employed as the swelling prevention mechanism. However, the present invention is not limited to this, and only the ring body 57 may be configured as the swelling prevention mechanism. FIG. 3 shows the second embodiment, in which a part of the outside air introduction valve V3 portion of the first embodiment is changed. In the second embodiment, the ring body 57 is fitted between the tubular member 45 and the hanging wall portion 46a, the ventilation groove 57a is provided vertically on the outer periphery of the ring body 57, and the ventilation groove 57a is formed. The inlet 49 is connected to the outside air introduction valve V3. Other configurations are the same as those of the first embodiment. Even when the ring body 57 is employed, a configuration may be adopted in which the ring body 57 is fitted by providing a gap with the hanging wall portion 46 a without using the locking plate 50. In that case, it is preferable to select a material for the ring body 57 that does not swell due to the liquid.

  In the discharge head C5, a vertical cylinder 60 having an inner peripheral lower end fitted to the outer peripheral upper end of the stem C2 is suspended from the back surface of the top plate 61, and an outer peripheral wall 62 is suspended from the peripheral edge of the top plate 61. The lower end portion of the inner peripheral wall 63 suspended from the rear surface of the top plate 61 is suspended at the position of the outer peripheral upper end portion of the guide tube 12. Further, a nozzle 64 having a base end opened at the upper end of the vertical cylinder 60 is projected forward, and a discharge port 65 is opened at the tip. Further, a seal tube portion 66 is suspended from the outer peripheral edge of the lower surface of the vertical tube 60 as the lower surface of the discharge head C5, and an annular recess 67 is defined between the seal tube portion 66 and the outer periphery of the stem C2. Further, a vertical concave groove 68 having a lower end opened at the upper end of the annular concave portion 67 and an upper end opened directly above the stem C2 is provided vertically on the inner surface of the vertical cylinder 60 directly above the annular concave portion 67. An air passage p that communicates from the air cylinder 20 into the stem C2 is formed in the longitudinally recessed groove 68, in the annular recess 67, and between the stem C2 and the cylindrical member 45. Further, a rib 69 projects from the upper part in the vertical cylinder 60.

The mounting cylinder member C6 has a foaming member C7 fitted therein, and the upper part is fitted into the vertical cylinder 60 of the discharge head C5 and the lower part is fitted to the upper end part in the stem C2. In the first embodiment, a lower mounting cylinder portion 77 fitted to the upper end portion in the stem C2 is suspended from the lower end of the upper mounting cylinder portion 75 fitted to the inner periphery of the vertical cylinder 60, so that the lower mounting is performed. The lower end portion of the cylindrical portion 77 is provided with a flange-shaped bottom plate extending in the center by opening a communication window, and a hanging cylinder is suspended from the lower surface of the flange-shaped bottom plate on the inner periphery of the stem C2. A plurality of gap ribs 78 projecting from the lower surface of the flange 76 to the outer surface of the lower mounting cylinder portion 77 are provided in the circumferential direction, and the gap ribs 78 abut against the upper surface and the inner surface of the corresponding stem C2. 76 and the lower mounting cylinder part 77 and the stem C2 are provided with an air passage communicating from the air passage p opened in the inner surface of the vertical cylinder 60 above the stem C2 into the stem C2.

  A gas-liquid mixing chamber R in which the air passage p and the liquid flow path merge is defined in the stem C2.

  The foaming member C7 is provided with a pair of cylinders 81 with meshes stretched, and is fitted into the upper mounting cylinder portion 75 of the mounting cylinder member C6 so that the mesh 80 becomes the upper end and the lower end. Although a pair of cylinders are provided in the first embodiment, it is possible to fit one cylinder with a mesh stretched, or three or more cylinders, which can be selected as appropriate. It is.

  The poppet valve body D is provided with a plurality of circumferentially extending locking projections 85 positioned on the outer surface of the lower end portion between the locking ribs 25 of the liquid cylinder 21, and the stem C <b> 2 from inside the liquid cylinder 21. It has a length that extends to the inner and lower parts, and is mounted so that it can move up and down from the position where the valve seat 22 for the suction valve contacts the lower surface to the position where each locking projection 85 contacts the lower surface of the coil spring s. doing. Above each locking projection 85, a lower part is formed as a large diameter part and an upper part is formed as a small diameter part, and a check valve body 86 that expands into a tapered cylindrical shape is formed at the upper end of the small diameter part. The valve body 86 and the valve seat 32 for the check valve form a check valve V4. The lower end of the poppet valve body D and the valve seat 22 for the suction valve constitute a suction valve V5.

  When the foam discharger 1 pushes down the discharge head C5 from the state of FIG. 1, the air piston C3 rises relative to the stem C2, the air discharge valve V2 opens, and the air piston C3 descends. As a result, the air in the air cylinder 20 is pressurized and introduced into the gas-liquid mixing chamber R from the air discharge valve V2 through the air passage p. On the other hand, the liquid cylinder 21 is lowered and lowered until the poppet valve body D is brought into contact with the valve seat 22 for the suction valve, and the poppet valve body D is relatively lifted with respect to the stem C2 to check valve. V4 is opened, and the pressurized liquid in the liquid cylinder 21 is introduced into the gas-liquid mixing chamber R through the discharge valve V1, where the gas-liquid is mixed. The gas-liquid mixed in the gas-liquid mixing chamber R passes through the foaming member C7 and foams, and is discharged to the outside from the discharge port 65 of the nozzle 64 of the discharge head C5.

  When the pressure of the discharge head C5 is released, the actuating member C is lifted by the biasing force of the coil spring s. At this time, the air piston C3 is lowered relative to the stem C2, and the air discharge valve V2 is closed. Due to the negative pressure in the cylinder 20, the outside air is introduced into the air cylinder 20 via the outside air introduction valve V3.

  On the other hand, as the stem C2 rises, the poppet valve body D rises due to the frictional force between the check valve V4 and each of the vertical protrusions 37, and the container body 100 is placed in the liquid cylinder 21 in which the suction valve V5 is opened to be negative pressure. The liquid inside is introduced, and the discharge valve V1 is closed at that time. The poppet valve body D rises until the locking projection 85 abuts against the lower surface of the coil spring s. Thereafter, the check valve body 86 abuts against the valve seat 32 for the check valve with respect to the stem C2. Until it falls relatively.

  4 and 5 show a third embodiment of the foam dispenser of the present invention.

  The third embodiment is partially different from the first embodiment in the structure of the outside air introduction valve V3. The third embodiment includes an outside air introduction valve body 56 having the same form as that of the first embodiment. As a bulge prevention mechanism, a locking projection 51 for preventing the mounting cylinder 55 from swelling is integrally provided from the partition wall 46. The locking protrusions 51 have a configuration in which a plurality of circumferential protrusions are provided at an annular position on the back surface of the partition wall 46. Since other configurations and operations are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted. The locking projection 51 integrally protruding from the partition wall 46 is not limited to that of the third embodiment, but, for example, the locking plate 50 of the first embodiment is engaged from the inner surface of the hanging wall portion 46a. It is also possible to provide a stop protrusion 51 so that the inner surface of each locking protrusion 51 contacts and locks to the outer surface of the mounting cylinder 55.

1: Foam dispenser A: mounting cap 10 ... peripheral wall, 11 ... top wall, 12 ... guide cylinder B: cylinder member 20 ... air cylinder, 21 ... liquid cylinder, 22 ... valve seat for suction valve,
DESCRIPTION OF SYMBOLS 23 ... Pipe fitting cylinder, 24 ... Pipe for suction, 25 ... Locking rib C: Actuating member C1: Piston for liquid 30 ... Fitting cylinder part, 31 ... Sliding part, 32 ... Valve for check valve Seat C2: Stem 35 ... Valve seat for discharge valve, 36 ... Discharge valve body, 37 ... Vertical projection, 38 ... Valve seat for air discharge valve,
39 ... Vertical projection C3: Piston 45 for air ... Cylindrical member, 46 ... Partition, 46a ... Vertical wall part, 47 ... Sliding part,
48 ... Valve seat for outside air introduction valve, 49 ... Intake port, 50 ... Locking plate, 51 ... Locking projection C4 ... Outside air introduction valve member 55 ... Mounting cylinder, 56 ... Outside air introduction valve body, 57 ... Ring body, 57a ... Ventilation groove C5: Discharge head 60 ... Vertical cylinder, 61 ... Top plate, 62 ... Outer peripheral wall, 63 ... Inner peripheral wall, 64 ... Nozzle,
65 ... discharge port, 66 ... seal cylinder, 67 ... annular recess, 68 ... longitudinal recess, 69 ... rib C6: mounting cylinder member 75 ... upper mounting cylinder, 76 ... flange, 77 ... lower mounting cylinder, 78 ... Gap rib C7: foaming member 80 ... mesh, 81 ... cylinder D: poppet valve body 85 ... locking projection, 86 ... check valve body V1: discharge valve V2: air discharge valve V3: outside air introduction valve V4: Check valve V5: Suction valve s: Coil spring p: Air passage R: Gas-liquid mixing chamber 100: Container body 101.

Claims (6)

The upper end portion is fixed to the mounting cap (A) fitted to the outer periphery of the mouth / neck portion (101) of the container body (100) and suspended in the container body (100), and a large-diameter air cylinder (20) and A cylinder member (B) formed by concentrically connecting small-diameter liquid cylinders (21) vertically, and a liquid piston (C1) sliding in the liquid cylinder (21) are connected to the lower part of the outer periphery of the stem (C2). The air piston (C3) sliding inside the air cylinder (20) is linked to the upper periphery of the stem (C2), and the discharge head (C5) is fitted to the upper end of the stem (C2). And an operating member (C) mounted so as to be movable up and down in an upwardly biased state, and from the inside of the liquid cylinder (21) and the air cylinder (20) by the vertical movement of the operating member (C). The air is joined and raised through the foaming member (C7). Is, a foam dispenser which is composed as to discharge from the discharge port of the discharge head (C5) (65),
The air piston (C3) is slidably fitted on the outer periphery of the stem (C2) and the cylindrical member (45) fitted to the outer circumference of the stem (C2) so as to be movable up and down with a predetermined width. The sliding portion (47) is connected by a partition wall (46) that divides the upper and lower sides of the air cylinder (20).
An annular outside air introduction valve element (56) projecting from a mounting cylinder (55) fitted on the outer periphery of the tubular member (45), and a valve seat (48) for an outside air introduction valve provided at the lower part of the partition wall (46) An outside air introduction valve (V3) constituted by the air inlet (49) provided in the partition wall (46) so as to be openable and closable,
A swelling prevention mechanism is provided that prevents at least the upper outer surface of the mounting cylinder (55) from being swollen in a state in which the air inlet (49) and the outside air introduction valve (V3) can be vented to prevent the mounting cylinder (55) from swelling. A foam dispenser characterized by that. A vertical wall portion (46a) is formed in the inner peripheral portion of the partition wall (46), an intake port (49) is opened in the partition wall (46) inside the vertical wall portion (46a), and the level is defined by the vertical wall portion (46a). An annular outside air introduction valve body, which has a lower surface of the lowered partition wall (46) as a valve seat (48) for an outside air introduction valve and protrudes from a mounting cylinder (55) fitted at a position opposite to the hanging wall portion (46a). (56) A ring body (57) which prevents the swelling of the mounting cylinder (55) as an anti-swelling mechanism by forming the outside air introducing valve (V3) by pressing the outer peripheral edge portion against the valve seat (48) for the outside air introducing valve. The foam discharger according to claim 1, which is configured to be fitted to at least the upper outer surface of the mounting cylinder (55) in a state in which ventilation between the intake port (49) and the outside air introduction valve (V3) is possible.   As a swelling prevention mechanism, a plurality of locking plates (50) in the circumferential direction protrude from the inner surface of the hanging wall (46a) facing the mounting cylinder (55), and the inner surface of each locking plate (50) is a ring body (57). The foam discharger according to claim 2, wherein the foam discharger is fitted to an outer surface and communicates between the intake port (49) and the external air introduction valve (V3) through each of the locking plates (50). As a swelling prevention mechanism, the ring body (57) is fitted between the mounting cylinder (55) and the hanging wall part (46a), and a ventilation groove (57a) is provided vertically on the outer periphery of the ring body (57). The foam discharger according to claim 2, wherein the intake port (49) and the outside air introduction valve (V3) are communicated with each other through a ventilation groove (57a). A vertical wall portion (46a) is formed in the inner peripheral portion of the partition wall (46), an intake port (49) is opened in the partition wall (46) inside the vertical wall portion (46a), and the level is defined by the vertical wall portion (46a). An annular outside air introduction valve body, which has a lower surface of the lowered partition wall (46) as a valve seat (48) for an outside air introduction valve and protrudes from a mounting cylinder (55) fitted at a position opposite to the hanging wall portion (46a). (56) The outer peripheral edge is pressed against the valve seat (48) for the outside air introduction valve to constitute the outside air introduction valve (V3), and as a bulge prevention mechanism, a locking projection for preventing the mounting cylinder (55) from swelling. The foam discharger according to claim 1, wherein the portion (51) is integrally projected from the partition wall (46).   The foam discharger according to claim 5, wherein the locking protrusions (51) are locking protrusions (51) provided in a plurality in the circumferential direction at an annular position on the back surface of the partition wall (46).