HK1174528B - Artificial nipple and nursing container using same - Google Patents

Abstract

The disclosed artificial nipple and nursing container using same are made so that the nipple end sufficiently reaches the nursing depression, can be adequately squeezed, and in that state, a nursing action can be reliably performed. The artificial nipple is a molded article that has a hollow roughly conical shape overall of an elastic material such as a flexible resin, and is provided with: a base section (21) that expands to match an object attached to; an areola section (22) that is formed connected to said base section and that narrows gradually while extending; and a nipple section (23) that extends from said areola section and that narrows more than the aforementioned areola section. A flange section (41) provided to the aforementioned base section has a predetermined thickness, and is provided with a check valve (44) that is provided to said base section and that forms a valve body that falls completely within the dimensions of the thickness of the aforementioned flange.

Description

Artificial nipple and nursing device using same

Technical Field

The present invention relates to an improvement of an artificial nipple suitable for a nursing bottle and a nursing bottle having the improved artificial nipple.

Background

Artificial nipples attached to bottles containing milk or pre-expressed breast milk have been widely used.

In particular, when an infant sucks the artificial nipple and suckles with a feeder, if the volume of milk is reduced by sucking the milk contained in the feeding bottle, the pressure in the bottle is reduced in accordance with the reduction, and the milk is hard to be sucked, and the artificial nipple is also crushed by the negative pressure.

Therefore, there are many cases of artificial nipples in which a valve body protruding downward is provided on a flange portion of a base portion of a lower end of the artificial nipple, and a check valve for introducing outside air into a bottle is formed (see patent documents 1 and 2, and patent documents 2 and 2).

Patent document

Patent document 1: US2005/0252875A1

Patent document 2: japanese patent laid-open No. 2006-6809

However, the artificial nipple of patent document 1 is an artificial nipple in which a valve body is provided so as to be exposed downward from a flange portion of the artificial nipple, and thus the valve body is easily damaged, and in particular, there are cases where: the valve element as the movable piece is easily deformed and cannot be overlapped due to deterioration with time, and thus the original function is lost.

The artificial nipple of patent document 2 is an artificial nipple in which a valve body is provided on a flange portion, but since a part of the artificial nipple is exposed from the flange, and the valve body itself has a semicircular structure and a small movable range, and hardly contributes to improvement of strength, the artificial nipple is likely to be damaged by contact with a part of the valve body from the outside or by damage when repeatedly opened and closed.

Further, since there is no gap between the cap for attaching the artificial nipple to the bottle and the artificial nipple, it is necessary to forcibly form a gap by pressing the base of the artificial nipple in order to introduce outside air into the bottle, which is not convenient in practice.

In addition, there is a risk of the beverage contained in the bottle leaking out when the base of the artificial nipple is deformed.

Disclosure of Invention

Accordingly, an object of the present invention is to provide an artificial nipple which is less likely to be damaged and is less likely to be deformed even when repeatedly opened and closed, and which has a check valve that prevents deformation and damage due to external force during cleaning or during attachment and that can reliably introduce external air into a bottle, and a nursing apparatus using the artificial nipple.

In order to achieve the above object, an artificial nipple according to the present invention is a molded article of a hollow body made of an elastic material such as a soft resin and having a substantially conical shape as a whole, the artificial nipple including: a base portion having an enlarged diameter corresponding to an object to be mounted; a nipple ring portion formed continuously with the base portion and extending in a manner of gradually reducing the diameter; and a nipple portion extending from the nipple ring portion and having a diameter reduced further than the nipple ring portion, the artificial nipple further including: a flange portion provided at the base portion and having a predetermined thickness; and a check valve in which the valve body is formed so as to be completely accommodated within the thickness dimension of the flange portion.

According to the above configuration, since the valve body of the check valve is completely accommodated within the thickness dimension of the flange portion, almost no object comes into contact with the valve body from the outside. In particular, excessive force is not applied to the valve body even during cleaning or the like, and deformation and damage of the valve body can be effectively prevented.

Preferably, the check valve has a slit formed by abutting the tips of two valve bodies so that the valve bodies have a triangular cross section, and the base end of the valve body is formed integrally with the flange.

According to the above configuration, the base end portion of the valve body is formed integrally with the flange portion, so that the base end portion of the valve body can be formed simultaneously with the molding of the artificial nipple, and the base end portion of the valve body is formed integrally without being formed separately, whereby a structurally strong structure can be obtained.

Preferably, an integrated position of the base end portion of the valve body and the flange portion is substantially arc-shaped.

According to the above configuration, by forming the base end portion of the valve body integrally formed in an arc shape, it is possible to effectively prevent the occurrence of damage such as edge breakage, and a stronger structure can be obtained.

Preferably, the check valve has a structure for opening and closing a slit which is a linear opening formed at a distal end of a valve body formed of two movable pieces, and the slit is formed in a direction perpendicular to a circumferential direction of the flange portion, that is, in a radial direction.

According to the above configuration, when the cap for attaching the artificial nipple to the bottle is attached to the bottle and the cap is screwed, even if a screwing force acts in the circumferential direction, the following problems do not occur: the positions of slits, which are the tips of the respective valve elements of the check valve, slide laterally, and are displaced from each other, so that the valve elements cannot overlap each other.

Preferably, through holes are formed at both ends of the slit, and the diameter of the through holes is formed to be larger than the gap size of the slit.

According to the above configuration, the slit portions of the valve body are prevented from sticking to each other and becoming difficult to open, and the valve body can be more reliably opened and closed.

Preferably, the artificial nipple of the present invention comprises: a bulge part which is integrally formed downwards from the nipple ring part and bulges outwards in the radial direction; and a flange portion facing the overhanging lower surface of the bulging portion via a reduced diameter portion, wherein the cap is attached such that an inward flange portion of a hard cap attached to a bottle for beverage storage is inserted into the reduced diameter portion, and wherein a gap is formed between a part of the reduced diameter portion and the cap by setting at least a part of the depth of the reduced diameter portion to be deeper than an inner end of the inward flange portion, and the check valve is provided at a position communicating with the gap.

According to the above configuration, since the external air passes through the gap between the slit and the cap and the check valve communicating with the gap, the pressure in the bottle can be adjusted without deforming the artificial nipple by pressing with a hand as in the conventional case.

In order to achieve the above object, the present invention provides a nipple and a bottle having the nipple attached thereto, wherein the nipple is a molded product of an elastic material such as a soft resin and has a substantially conical hollow body as a whole, and the nipple includes: a base portion having an enlarged diameter corresponding to an object to be mounted; a nipple ring portion formed continuously with the base portion and extending in a manner of gradually reducing the diameter; and a nipple portion extending from the nipple ring portion and having a diameter reduced further than the nipple ring portion, the nursing container further including: a flange portion provided at the base portion and having a predetermined thickness; and a check valve in which the valve body is formed so as to be completely accommodated within the thickness dimension of the flange portion.

ADVANTAGEOUS EFFECTS OF INVENTION

As described above, according to the present invention, it is possible to provide an artificial nipple which is less likely to be damaged, is less likely to be deformed even when repeatedly opened and closed, and has a check valve capable of reliably introducing external air into a bottle, and a nursing bottle using the artificial nipple.

Drawings

Fig. 1 is a schematic front view showing the entirety of a nursing bottle according to an embodiment of the present invention.

Fig. 2 is a top view of the nipple portion of the fig. 1 mammal.

Fig. 3 is a view showing an example of a cap for connecting a bottle and an artificial nipple in the nursing bottle of fig. 1.

Fig. 4 is a schematic sectional view taken along line D-D of fig. 2.

Fig. 5 is an enlarged view of the nipple portion of fig. 4.

Fig. 6 is a sectional view taken along line E-E of fig. 5.

Fig. 7 is a schematic front view of the artificial nipple according to the present embodiment.

Fig. 8 is a schematic sectional view taken along line a-a of fig. 2.

Fig. 9 is a partially enlarged sectional view of fig. 8.

Fig. 10 is a partially enlarged sectional view of a coupling portion of the artificial nipple and the cap.

Fig. 11 is a schematic sectional view taken along line F-F of fig. 9.

Fig. 12 is a view showing the shape of the joint portion of the valve body of fig. 11.

Fig. 13 is an explanatory view showing directions of slits and flanges of the valve body of fig. 11.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments described below are technically preferable and various limitations are added because they are preferable specific examples of the present invention, but the scope of the present invention is not limited to these embodiments unless specifically described in the following description to limit the gist of the present invention.

Fig. 1 is a schematic front view showing a structure of a nursing bottle according to an embodiment of the present invention.

In the drawings, reference numeral 1 denotes a bottle used as a feeding bottle or the like, and is an example of a beverage container.

A male screw, not shown, is formed on the outer periphery of the upper end of the bottle 1 and can be screwed into a female screw on the inner surface of the cap 3.

The cap 3 is fitted with the lower end base of the artificial nipple 20 as described later, and in this state, the cap 3 is screwed to the upper end of the bottle 1.

Fig. 2 is a schematic plan view of the artificial nipple 20 of fig. 1, fig. 4 is a schematic sectional view taken along line D-D of fig. 2, fig. 5 is an enlarged view of a nipple portion of the artificial nipple of fig. 4, and fig. 6 is a sectional view taken along line E-E of fig. 5.

As shown in fig. 4, the artificial nipple 20 is integrally molded from an elastic material such as a soft synthetic resin. As such a material, a silicone rubber, an isoprene rubber, a thermoplastic elastomer, or a natural rubber having a hardness of 10 to 40 (measured by a type A durometer in JIS-K6235(ISO 7619)) is used. In the present embodiment, a silicone rubber is selected, and a silicone rubber having a hardness of 15 to 35 (measured by a type a durometer in JIS-K6235(ISO 7619)) can be used.

The dimensions of the teat portion and the like of the artificial nipple will be described later.

Fig. 3 shows a cap (hereinafter, referred to as "cap") for attaching the artificial nipple 20 to the bottle 1, fig. 3(a) is a schematic perspective view of the cap 3, and fig. 3(b) is a half sectional view of the cap 3.

The entire lid 3 is a molded article of hard synthetic resin, and is a flat cylindrical body. The upper opening 31 of the flat cylindrical body is smaller in diameter than the lower opening 32, and a female screw portion 33 is formed on the inner surface of the flat cylindrical body. An inward flange portion 34 is formed adjacent to the upper opening 31 in the upper portion of the lid 3, and the inward flange portion 34 constitutes a stepped-down portion.

The artificial nipple 20 is formed of the above-described material and is a molded product having a substantially conical hollow body as a whole.

The artificial nipple has: a base portion 21 having an enlarged diameter corresponding to an opening of a mounting object, for example, the bottle 1 of fig. 1; a nipple ring portion 22 formed continuously with the base portion 21 and extending so as to gradually decrease in diameter; and a nipple portion 23 extending from the nipple ring portion, having no diameter expansion until reaching the tip end, and extending while gradually reducing the diameter at a small point at a diameter reduction ratio smaller than the diameter reduction ratio of the nipple ring portion. In the drawing of the nipple portion, an opening 25 for spouting out the beverage is formed at the upper end. The opening 25 can be selected from a circular hole, a Y-shape, a cross shape, a slit shape in one direction, and the like, as appropriate according to the cutting shape.

As shown in fig. 4, the nipple ring portion 22 is formed to have a larger thickness than the nipple portion 23.

A weak portion 24 is provided at the boundary between the nipple ring portion 22 and the nipple portion 23, and the weak portion 24 is formed in a band shape along the circumference of the position by making the wall thickness thinner than the nipple ring portion 22 and thicker than the nipple portion 23.

As shown in the drawing, the weak portion 24 is configured to gradually change the wall thickness so that the wall thickness becomes thicker in the vicinity of the nipple portion 22 and thinnest in the vicinity of the nipple portion 23.

This increases the rigidity of the fragile portion near the nipple ring portion 22, and the fragile portion becomes less rigid and is likely to be deformed (bent) when approaching the nipple portion 23. However, since the thickness is sufficiently large at a position near the nipple ring portion 22, the structure is such that no recess occurs at all at the time of bending.

The wall thicknesses of the nipple portion 22 and the nipple portion 23 can be appropriately adjusted based on the hardness of the material used, but it is preferable that the wall thickness of the nipple portion 23 is 1.0mm to 2.5mm and the wall thickness of the nipple portion 22 is 1.5 times or more.

In the present embodiment, the thickness of the nipple portion 23 is set to 1.5mm to 2.0mm, and the thickness of the nipple ring portion is set to 3.0 mm.

As is apparent from fig. 5 and 6, ribs extending in the longitudinal direction are provided on the inner surface of the nipple portion 23.

In this embodiment, a plurality of ribs 26 are formed, each extending in the longitudinal direction at the same height, with the lower end overlapping the upper portion of the fragile portion 24, and formed at three positions at equal intervals along the inner periphery as shown in fig. 6.

Accordingly, when the nipple portion 23 is crushed by the pressure of the movement of the tongue of the infant such as peristalsis during the nursing movement, the gap can be formed between the rib 26 and the inner wall of the nipple portion 23, and therefore the passage of the beverage is not obstructed.

Further, by providing the rib 26 on the inner surface of the nipple portion 23, the deformation (bending) of the nipple portion 23 can be prevented, and the fragile portion 24 can be reliably deformed (bent).

Further, if the height (inward projecting dimension) of the rib 26 is set to be lower in the upper direction and higher in the lower direction in fig. 5, the mold release at the time of manufacturing can be relatively facilitated, the rigidity of the weakest region at the position of the weak portion 24 can be increased, and even if the weak portion 24 is bent and crushed by any chance, the beverage passage cannot be completely closed.

The length L2 of the nipple portion 23 in the longitudinal direction in fig. 4 is set to a length sufficient for the nipple portion 23 to reach a nursing nest in the oral cavity of an infant when nursing (hereinafter, also referred to as "nursing" when taking fruit juice or other beverage other than milk).

The nursing nest is usually located at a position about 10 to 15mm from the lips of the infant to the oral cavity.

Therefore, if the length L2 of the nipple portion 23 is 15mm or more, the tip of the nipple portion 23 can reliably reach the nursing nest of the infant.

In the present embodiment, the length L2 of the nipple portion 23 in the longitudinal direction is set to 15mm, and the length L1 from the lower end of the base portion 21 to the distal end of the nipple portion 23 is set to 38 mm.

In order to stably hold the nipple ring portion 22 by the lips of the infant without inserting the nipple ring portion into the oral cavity of the infant even if the infant expands the lips during nursing, it is preferable that the width W1 in the radial direction of the base portion 21 is 35mm or more.

In the present embodiment, the width W1 in the diameter direction of the base 21 is set to 45 mm.

Refer to fig. 7.

Fig. 7 is a schematic front view of the artificial nipple 20, in which fine unevenness is formed on the surface of the area indicated by the mesh line of the nipple ring portion 22.

That is, the surface is a fine rough surface.

Thus, the nipple ring portion is stably held on the lips of the infant and is less likely to slide during a nursing movement of the infant, and the nipple ring portion can be effectively prevented from falling out of the mouth.

Such a concave-convex processing is obtained, for example, by forming a rough surface on the inner surface of a mold for molding by sandblasting or the like in advance, and then molding the rough surface. Alternatively, the artificial nipple may be integrally molded and then the nipple portion may be covered and subjected to a process such as sandblasting.

As described above, according to the present embodiment, the artificial nipple includes the nipple ring portion 22 which is formed continuously with the base portion 21 and extends so as to gradually decrease in diameter, and the nipple portion 23 which extends from the nipple ring portion 22, is not expanded in diameter in the middle before reaching the distal end, and extends while gradually decreasing in diameter at a small rate of diameter decrease smaller than the rate of diameter decrease of the nipple ring portion 22. Further, since the nipple portion 23 is set to a sufficient length so that the nipple portion 23 reaches the nursing nest in the oral cavity of the infant at the time of nursing, when a movement such as a peristaltic movement is performed during a nursing movement in the oral cavity of the infant, it is possible to prevent a problem that occurs in the conventional artificial nipple, that is, to prevent the enlarged nipple tip portion from being pushed back, and to reliably reach the nipple portion 23 at the tip end without causing the nipple portion 23 to stretch. Since the nipple portion 23 is processed to have a small thickness, the nipple portion is crushed in a state of reaching the nursing nest, and thus nursing can be performed in the same manner as nursing by the mother's nipple.

Further, by providing the weak portion 24, the nipple portion 23 can be made to face the nursing nest by being bent (not crushed) at this position, and a region crushed when receiving a motion such as peristalsis can be defined on the nipple portion 23, so that the nipple ring portion 22 is not affected. This allows the nipple ring portion to be slightly deformed in accordance with the movement of the lips of the infant, but not crushed, and to be stably held on the lips of the infant.

The base 21 of the artificial nipple 20 of fig. 4 is illustrated.

The base 21 has: a bulge portion 42 bulging outward in the diameter direction over the entire circumference at a lower portion of the nipple ring portion 22; an overhang 47 formed on the lower surface of the bulging portion; and a flange portion 41 having a predetermined thickness and bulging annularly outward at the lower end of the artificial nipple 20 over the entire circumference, for example, facing the overhanging portion 47.

A characteristic structure is provided in the region of the base 21.

Fig. 8 is a sectional view taken along line a-a of fig. 2, fig. 9 is an enlarged partial sectional view showing a region indicated by reference numeral P of fig. 8, and fig. 10 is an enlarged partial sectional view of fig. 9 in a state where the cover 3 is attached.

In fig. 8, 9, and 10, the bulging portion 42 is provided to correspond to a portion that is largely expanded in diameter from the nipple ring portion 22 so as to continue with the expansion of the breast.

A reduced diameter portion 51 composed of a groove or a slit having a size into which the inward flange portion 34 described in fig. 3(b) enters is formed between the bulging portion 42 and the flange portion 41.

In particular, it is important that at least a part of the reduced diameter portion 51 is formed so as to enter deeply, and as is understood from fig. 10, it is formed to a position deeper than the depth of the flange portion 34 of the lid 3.

Specifically, the reduced diameter portion 51 is formed to be deeper than the inner end of the flange portion 34 of the lid 3 by a dimension D2 when the flange portion 34 of the lid 3 is fitted into the reduced diameter portion 51.

On the other hand, the flange portion 41 is provided with a check valve 44, and the check valve 44 is configured to introduce air from the outside and to close when the liquid in the bottle 1 is about to flow out to the outside when the internal pressure of the bottle 1 is reduced by sucking milk or the like in the bottle 1 in a state where the artificial nipple 20 is attached to the bottle 1 through the cap 3, that is, in the state of fig. 1.

The check valve 44 is formed so as not to protrude from the upper and lower surfaces of the flange 41 and so as to be housed inside the thickness of the flange 41.

Specifically, a circular formation portion 43 as shown in fig. 13, for example, is provided in a predetermined region of the flange portion 41. As shown in fig. 11, integral portions 49, 49 are provided at the base end portion and the flange portion 41, and valve bodies 44a, 44b, which are movable pieces having a small wall thickness, are formed obliquely downward from the integral portions 49, and the respective valve bodies 44a, 44b are arranged so that the respective leading ends (lower ends in fig. 11) thereof are closed to prevent liquid leakage, and the leading ends are opened by air pressure in the direction of arrow a to form slits 48, whereby the air flows into the bottle 1.

Here, as shown by oblique lines in fig. 12, the root portions of the integral portions 49, 49 are formed integrally with the valve bodies 44a, 44b, which are the movable pieces, in a crescent shape or an arc shape.

That is, the check valve 44 has two valve bodies 44a and 44b whose distal ends are butted against each other so as to form a triangular cross section, and has a slit 48 that opens and closes, and base end portions (integral portions 49) of these valve bodies are formed integrally with a flange portion of the base portion in a substantially crescent shape.

As shown in fig. 13, the slit 48, which is an opening of the check valve 44, is a linear opening and is formed in a direction perpendicular to the circumferential direction S of the flange portion 41. Therefore, when the artificial nipple 20 attached to the cap 3 is attached to the bottle 1 and the cap 3 is screwed, even if a screwing force acts in the circumferential direction S, the respective tips (positions of the slits 48) of the respective valve elements 44a and 44b do not slide laterally, and the valve elements are not overlapped with each other due to a displacement.

In addition, through holes having a diameter larger than the gap size of the slit are formed at both end portions of the slit. Specifically, circular through holes 48a, 48a are preferably provided at both end portions of the slit 48. This prevents the portions of the valve body in the slit 48 from sticking to each other and becoming difficult to open, and the valve body can be more reliably opened and closed.

Therefore, although the through-hole 48a is circular in the illustrated case, the shape is not limited as long as the through-hole can exhibit the same function, such as a triangular shape.

As will be understood from fig. 10, the position 43 where the check valve 44 is formed can form the gap D1 by positioning the outer edge (inner end) thereof slightly inside (back side) of the inner end of the attached lid 34.

As shown in fig. 10, a through hole 46 is provided vertically in the bulging portion 42 at a position directly above the check valve 44. The inner end of the through hole 46 is located slightly inside (back side) of the inner end of the attached lid 34, and thereby the gap D3 can be formed.

As will be understood from fig. 7 and 11, it is preferable that the overhanging portion 47 of the bulging portion 42 is formed with spacer pieces 52, 52 in proximity to the check valve 44, and the spacer pieces 52, 52 are formed at positions sandwiching the through-hole 46 from both sides by a convex portion or the like having a minute thickness. The spacers 52, 52 constitute the gap G1 of fig. 11.

In the present embodiment, configured as described above, even if the internal pressure of the bottle 1 is reduced during nursing, the outside air passes through the through hole 46 of the bulging portion 42 and is discharged from the gap D1, and passes through the gaps D1 and D2 to reach the check valve 44, as indicated by an arrow a1 in fig. 10. In fig. 11, the check valve 44 opens the lower ends of the valve bodies 44a and 44b and injects the outside air from the slit 48 into the bottle 1 as indicated by an arrow a3 in fig. 10, so that the artificial nipple 20 can continue nursing without hindrance without collapsing due to a decrease in the internal pressure of the bottle 1.

In this case, even if the position of the artificial nipple 20 is changed and the through hole 46 is closed by the lips of the infant during nursing, the existence of the spacers 52 and 52 allows outside air to enter the gap G1 as indicated by the arrow a2, thereby effectively preventing the internal pressure of the bottle 1 from being lowered.

However, the present invention is not limited to the above embodiments.

Individual configurations of the above-described embodiments and modifications may be omitted as necessary, or may be combined with other configurations not described.

Description of the reference numerals

20 … artificial nipple, 22 … nipple ring part, 23 … nipple part, 24 … weak part, 34 … (of cover) flange part, 41 … flange part, 42 … bulge part, 44 … check valve, 48 … slit, 51 … reducing part, 52 … spacing piece, and D1, D2, D3 and G1 … gaps.

Claims (5)

1. An artificial nipple which is a molded article of an elastic material and which has a hollow body having a substantially conical shape as a whole, comprising:

a base portion having an enlarged diameter corresponding to an object to be mounted;

a nipple ring portion formed continuously with the base portion and extending in a manner of gradually reducing the diameter;

a nipple portion extending from the nipple ring portion and having a diameter reduced further than the nipple ring portion:

a flange portion provided at the base portion and having a predetermined thickness; and

a check valve, the artificial nipple being characterized in that,

the check valve is formed so as to be completely accommodated in the thickness dimension of the flange portion, and a slit for opening and closing is formed by abutting the tips of two valve bodies so that the valve bodies have a triangular cross section, the base end portion of the valve body being formed integrally with the flange portion,

and the integral position of the base end part of the valve body and the flange part is approximately arc-shaped.

2. The artificial nipple as claimed in claim 1, wherein a through hole is formed at both end portions of the slit, and a diameter dimension of the through hole is formed to be larger than a gap dimension of the slit.

3. The artificial nipple as claimed in claim 1 or 2, wherein the check valve has a structure for opening and closing a slit which is a linear opening formed at a front end of a valve body formed of two movable pieces, and the slit is formed in a direction orthogonal to a circumferential direction of the flange portion, i.e., in a radial direction.

4. An artificial teat as claimed in claim 1 or 2, having: a bulge part which is integrally formed downwards from the nipple ring part and bulges outwards in the radial direction; and a flange portion facing the overhanging lower surface of the bulging portion via a reduced diameter portion, wherein the cap is attached such that an inward flange portion of a hard cap attached to a bottle for beverage storage is inserted into the reduced diameter portion, and wherein a gap is formed between a part of the reduced diameter portion and the cap by setting at least a part of the depth of the reduced diameter portion to be deeper than an inner end of the inward flange portion, and the check valve is provided at a position communicating with the gap.

5. A nursing bottle having an artificial nipple and a bottle equipped with the artificial nipple is characterized in that,

the artificial nipple is a molded product of a hollow body made of an elastic material and having a substantially conical shape as a whole, and comprises:

a base portion having an enlarged diameter corresponding to an object to be mounted;

a nipple ring portion formed continuously with the base portion and extending in a manner of gradually reducing the diameter; and

a nipple part extending from the nipple ring part and having a diameter reduced further than the nipple ring part,

the mammal further has:

a flange portion provided at the base portion and having a predetermined thickness; and

a check valve having a valve body formed so as to be completely received in the thickness dimension of the flange portion,

a slit for opening and closing the check valve is formed by abutting the tips of two valve bodies so that the valve bodies have a triangular cross section, the base end of the valve body is formed integrally with the flange,

and the integral position of the base end part of the valve body and the flange part is approximately arc-shaped.