JP5650779B2 - Stopper with check valve - Google Patents

Description

  The present invention relates to a stopper with a check valve.

  As an example of a conventional beverage cup, there is known one having a liquid inlet at its lower portion and provided with a stopper with a check valve at the liquid inlet (Patent Document 1). In this beverage cup, it is described that a liquid is injected into the beverage cup by inserting a nozzle into a stopper valve. In addition, the details of the stopper with check valve are not described in this beverage cup, but it is indispensable to remove the nozzle from the stopper with check valve after injecting the liquid. A structure seems necessary.

  Moreover, as an example of a stopper with a check valve that is mainly used for a medical instrument, not a beverage cup, a cylindrical stopper body that fits into the opening of the bottle body, and an intermediate portion in the penetrating direction on the inner surface of the stopper body There is known one provided with an annular seal convex portion protruding from a stopper and a check valve recessed in a dome shape so as to close the lower opening end of the stopper body (Patent Document 2). Incidentally, this check valve is provided with a cut of one letter or ten letters as a backflow prevention structure. In addition, in this stopper with check valve, the seal projection is pressed against and closely attached to the outer peripheral surface of the small-diameter tube portion at the tip of the syringe body when the syringe body sucks out the liquid in the bottle body. The liquid in the bottle body does not leak from the stopper body.

International Publication No. WO2007 / 141719 Japanese Patent No. 3484117

  However, in the stopper with a check valve of Patent Document 2, when the user simply uses the bottle body upside down without inserting the tip small diameter tube portion of the syringe body, the liquid pressure (hereinafter referred to as “hydraulic pressure”) is obtained. It was inevitable that liquid leaks from the cuts.

  Therefore, when used in a mode in which hydraulic pressure is applied, such as a stopper with a check valve attached to the lower part of a beverage cup, a cut such as one letter as in Patent Document 2 is formed in a dome-shaped check valve. However, it was difficult to prevent liquid leakage because the cuts were naturally opened by the hydraulic pressure. In particular, users sometimes put a drinking cup on the table with a certain amount of momentum, and as a result, more and more liquid leaks occurred.

  Therefore, the stopper with a check valve is not limited to the use of a beverage cup, but has the same problem when used in an application where hydraulic pressure is applied.

  The present invention has been made in consideration of the above circumstances, and an object of the present invention is to prevent liquid leakage when the hydraulic pressure is applied to the check valve plug, that is, to improve the sealing performance.

  The stopper with a check valve of the present invention comprises an elastic member that has one end of a cylindrical stopper as an open end and the other end closed with a check valve. The check valve includes first, second, and third chevron portions that cooperatively block the other end of the stopper. The first mountain-shaped portion includes a straight belt-like first top surface portion, a pair of first slope portions that descend obliquely from both sides in the width direction of the first top surface portion, and descends from both sides in the longitudinal direction of the first top surface portion. And a pair of first wall surface portions connected to the plug body, and the first top surface portion has a cut parallel to the longitudinal direction thereof. Each of the second and third mountain-shaped portions protrudes from the first slope portion in the width direction of the first top surface portion, and is connected to the plug at the lower end thereof.

Further, according to the present invention, the first, second, and third chevron portions form a cross shape by intersecting the longitudinal direction of the first chevron portion with the second and third chevron portions. In addition, the second and third chevron portions are second and third top surface portions as belt-shaped top portions extending in a direction orthogonal to the first top surface portion, and both widthwise sides of the second and third top surface portions. A pair of second and third slope portions descending obliquely from the top, and a pair of second and third wall portions respectively descending from the longitudinal tips of the second and third top surface portions and connected to the plug body To.

  Further, the tops of the second and third chevron portions are not limited in height, but it is desirable to make the pair of the first slope portions narrow so that the cuts can be intimately closed as follows. . That is, each top part of the second and third chevron parts is lower than the first top surface part.

  The inner part of the check valve plug may be hollow or solid. To make the cut easier to open when a liquid injection pipe is inserted into the check valve plug, It is desirable to do so. That is, the top surface portion, the slope portion, and the wall surface portion of each of the first, second, and third chevron portions are formed in a flat plate shape, and a pipe for liquid injection is provided inside the check valve at intervals in the circumferential direction. A total of four contact portions are formed for contact with each other, each contact portion is formed by two adjacent slope portions, and the inner diameter of the check valve is narrowed from the plug body side to each top surface portion side. It is provided to protrude in the direction.

  Furthermore, the plug body only needs to be cylindrical, and it is desirable to make the plug with the check valve easy to attach to the object to be used as follows. That is, the plug body has a cylindrical plug body main body and a mounting portion protruding from the outer peripheral surface of the plug body main body.

  The use of the check valve plug is not limited, but examples of suitable applications include the following. In other words, the use of the check valve plug is to make a drinking cup.

  According to the stopper with a check valve of the present invention, the rigidity of the first chevron portion is improved by the second and third chevron portions. Therefore, even if hydraulic pressure is applied, the shape of the first chevron portion and the first apex portion are increased. The shape of the cut on the surface portion is not extremely deformed, whereby the sealing property of the cut is improved as compared with the conventional case, and the liquid does not leak easily.

Since the first, second, and third chevron portions are arranged so as to cross in a cross shape, when hydraulic pressure is applied, one of the second chevron portion and the third chevron portion faces the other. Since the other acts to stop the deformation, the sealing performance of the cut is further improved.

Furthermore, when each top part of the 2nd, 3rd mountain-shaped part is made lower than the 1st top surface part, when hydraulic pressure is added, a 2nd, 3rd mountain-shaped part pinches a pair of 1st slope part. However, since the deformation does not directly act on the first top surface portion having the cut, the sealing performance of the cut is improved.

  Further, when the top surface portion, the slope portion, and the wall surface portion of each of the first, second, and third chevron portions are formed in a flat plate shape, the contact portion is spaced apart in the circumferential direction inside the check valve. Are formed in total. When the pipe for liquid injection is inserted into such a stopper valve, the cut is gradually opened by gradually pushing the pipe along the slopes of the slopes forming these contact parts. Therefore, for example, in the case of a stopper with a check valve without a contact portion, the tube is inserted so that the inner surface side of the first top surface portion is pushed open all at once. In some cases, the cut becomes easier to open.

  Further, when the plug body has a cylindrical plug body main body and a mounting portion protruding from the outer peripheral surface of the plug body main body, the mounting portion makes it easy to attach the plug with the check valve to the object to be used.

  In addition, it is desirable that the use of the stopper valve is a drinking cup.

(A)-(d) The figure shows a top view, a bottom view, a front view, and a side view of the stopper with check valve of the first embodiment of the present invention in order. (A) and (B) are a cross-sectional view taken along line AA and a cross-sectional view taken along line BB in FIG. It is a perspective view of the stopper with a check valve of the first embodiment of the present invention. (A)-(d) The figure shows a front view, a left side view, a plan view, and a bottom view of a cup body that fixes the stopper with a check valve of the first embodiment of the present invention in order. (A) and (B) are a plan view and a cross-sectional view taken along line AA of the first embodiment of the stopper with a check valve for the cup body. (A)-(c) The figure shows sequentially the sectional view which made the state of a stopper with a check valve correspond to the condition of insertion of the pipe in it. (A) to (f) are a plan view, a right side view, a front view, a perspective view, a cross-sectional view taken along line AA, and a line BB of a stopper valve with a check valve according to a second embodiment of the present invention. Sectional drawing of a cutting part is shown in order.

  1 to 3 show a check valve plug 1 according to a first embodiment of the present invention. A stopper 1 with a check valve according to the first embodiment is an elastic member made of synthetic resin (for example, made of silicon) or rubber that is integrally molded, and has a cylindrical stopper 2 and a check valve 3. One end of the plug body 2 is an open end, and the other end of the plug body 2 is a closed end by a check valve 3. Each component will be described in detail below.

  The plug body 2 is provided with a cylindrical plug body portion 21 (cylindrical in the illustrated example) and a mounting portion 22 that protrudes from the outer peripheral surface of the plug body portion 21.

  The mounting portion 22 is composed of ring-shaped first and second rods 22a and 22b projecting over the entire outer peripheral surface of the plug body portion 21, and the first and second rods 22a and 22b are formed of the plug body. The portions 21 are provided at intervals in the center line direction (cylinder longitudinal direction). The first rod 22a is located on the check valve 3 side (closed end side), the second rod 22b is located on the open end side, and the plug body 21 is located between the first rod 22a and the second rod 22b. An annular groove 22c that is relatively recessed over the entire outer periphery is formed.

  The first rod 22a has a tapered end face on the check valve 3 side (end face on the closed end side) so that the radius of the taper gradually decreases toward the closed end side. On the other hand, the first rod 22a is formed in a plane orthogonal to the center line direction on the end surface (end surface on the opening end side) opposite to the check valve 3.

  The second rod 22b has a tapered end surface on the check valve 3 side (a surface facing the first rod 22a), and the radius of the taper gradually decreases toward the opening end. Therefore, the annular groove 22c has a narrower outer peripheral side than the inner peripheral side with respect to the interval in the center line direction. Further, the second flange 22b is formed so as to be flush with the opening end (end surface) of the plug body 21 on the end surface (end surface on the opening end side) opposite to the check valve 3.

  The check valve 3 includes first, second, and third chevron portions 31, 32, and 33 that cooperatively close the other end of the plug body (plug body portion 21) 2.・ 32 and 33 are hollow.

  The first chevron 31 includes a straight belt-shaped (more specifically, a horizontally long and narrow rectangular shape) first top surface portion 31a at the highest position, and two sides along the longitudinal direction of the first top surface portion 31a. That is, a pair of first slope portions 31e and 31e that descend obliquely from both sides in the width direction and a pair of first wall surface portions 31h and 31h that descend from both longitudinal sides of the first top surface portion 31a and connect to the plug body 2 are provided. Is.

  A cut 31b penetrating in the thickness direction (Z direction) is formed at the center of the dimension in the width direction of the first top surface portion 31a. The cut 31b extends in parallel along the longitudinal direction of the first top surface portion 31a. Incidentally, the cut extends in a range excluding both longitudinal ends of the first top surface portion 31a, more specifically, in a range excluding the pair of first wall surface portions 31h and 31h. The center of the dimension in the extending direction of the cut 31b is the center of the dimension in the longitudinal direction of the first top surface portion 31a, and is disposed on the center line of the plug body 21. With the center of the cut 31b as the origin (center point), the center line direction of the plug body 2 is the Z direction (height direction), the longitudinal direction of the first top surface portion 31a is the X direction (vertical direction), and X And the direction perpendicular to the Z direction (the width direction of the first top surface portion 31a) may be hereinafter described as the Y direction (lateral direction).

  Each first wall surface portion 31 h is continuous with the closed end side of the plug body 2. Further, the pair of first wall surface portions 31h and 31h and the pair of first slope portions 31e and 31e are both provided symmetrically with respect to the center point.

  The first slope portion 31e includes a first slope portion main body 31f that descends obliquely from the first top surface portion 31a, and a first slope portion skirt 31g that slopes downward from the lower end of the first slope portion main body 31f. And. The first slope skirt 31g has a triangular shape when viewed from the upper side in the Z direction.

  The second and third chevron portions 32 and 33 are formed symmetrically with respect to the first chevron portion 31, and when viewed from the upper side in the Z direction, each first inclined surface portion 31e extends to the first top surface portion 31a. It protrudes in the width direction (in the Y direction). More specifically, in the illustrated example, the second and third chevron portions 32 and 33 extend in the right-angle direction (Y direction) from both sides of the longitudinal intermediate portion of the first top surface portion 31a. The first chevron 31 penetrates the third chevron 32/33 so that the first / second / third chevron 31/32/33 forms a cross shape as a whole. Crossed. Since the second and third chevron portions 32 and 33 are symmetrical, only the second chevron portion 32 will be described in detail. On the other hand, the description of the third chevron portion 33 is omitted, and only the reference numerals are given in the drawing in the same manner as the details of the second chevron portion 32.

  The top portion 32a at the highest position in the second chevron portion 32 is flat, and this top portion 32a is therefore the second top surface portion. The second top surface portion 32a is formed lower than the first top surface portion 31a, and the width direction (plug) of the first top surface portion 31a from below the intermediate portion in the longitudinal direction of the first top surface portion 31a in the first inclined surface portion 31e. It extends toward the outside of the body 2 in the radial direction). The second top surface portion 32a has an elongated rectangular shape like the first top surface portion 31a, but its length is slightly shorter than half of the first top surface portion 31a. The second mountain-shaped portion 32 includes a pair of second slope portions 32e and 32e that descend obliquely from both longitudinal sides of the second top surface portion 32a, and a radially outer side in the longitudinal direction of the second top surface portion 32a (outside in the Y direction). ) And a second wall surface portion 32 h that is connected to the plug body 2. Incidentally, the second wall surface portion 32 h and the first wall surface portion 31 h are connected in the circumferential direction of the plug body 2. Therefore, the closed end side of the plug body 2 is closed by the check valve 3 by the first, second, and third wall surfaces 31h, 32h, and 33h continuing to the closed end side of the plug body 2.

  Similarly to the first inclined surface portion 31e, the second inclined surface portion 32e is also inclined obliquely by changing the angle gently from the second inclined surface portion 32f descending from the second top surface portion 32a and the lower end of the second inclined surface portion 32f. And a second slope skirt 32g that descends. When viewed from the upper side in the Z direction, the second slope portion hem 32g has a triangular shape as well as the first slope portion skirt 31g. And the 1st slope part 31e and the 2nd slope part 32e are continuing on the boundary line 3L diagonally extended from a center point. More specifically, since the second mountain-shaped portion 32 has two second slope portions 32e, a boundary line 3L is also formed at the boundary between one first slope portion 31e and two second slope portions 32e and 32e. Two are provided. These two boundary lines 3L are provided symmetrically with respect to the second top surface portion 32a. In addition, as in the relationship between one first slope portion 31e and two second slope portions 32e, one first slope portion 31e and two third slope portions 33e are also continuous with respect to two boundary lines 3L. ing. Therefore, four boundary lines 3L are formed at the boundary between the two first slope portions 31e, the second slope portion 32e, and the third slope portion 33e. Further, when viewed from the upper side in the Z direction, the four boundary lines 3L are arranged every 90 degrees with the origin as the center, and each boundary line 3L is radially radiated from the origin toward 45 degrees from the origin. It is designed to extend.

  The first, second, and third chevron portions 31, 32, and 33 have a hollow shape. That is, a first cavity 31k that tapers toward the inside of the first top surface 31a is formed inside the first chevron 31 and is the same as the first cavity 31k of the first chevron 31. The second and third hollow portions 32k and 33k are also formed inside the second and third mountain-shaped portions 32 and 33. Therefore, each part of each chevron 31, 32, 33, that is, the top part, the slope part, and the wall part has a flat plate shape, and the thickness of the plate shape is more than the thickness of the plug body 21. It is thinly formed. Incidentally, in each of the mountain-shaped portions 31, 32, and 33, the wall surface portion is thicker than the top surface portion and the slope portion, and the wall surface portion is not easily deformed. Further, when viewed from the lower side in the Z direction, the inner side of the check valve 3 is roughly divided into a cross shape by the three top surfaces of the first, second, and third top surfaces 31a, 32a, and 33a. In the region, contact portions 34 facing the hollow portions 31k, 32k, and 33k are formed. The abutting portion 34 is for abutting against a liquid injection tube. A total of four abutting portions 34 are formed on the inner side of the check valve at substantially equal intervals in the circumferential direction. Further, the contact portion 34 is formed by two slope portions adjacent to each other with the boundary line 3L as a boundary. For example, one abutment portion 34 is formed by the back surfaces of two slope portions including a first slope portion 31e and one second slope portion 32e, and the first slope portion 31e and the other second slope portion 32e. Another contact portion 34 is formed by the back surfaces of the two slope portions. Since each abutment portion 34 is formed by a slope portion, it is inclined toward the adjacent top surface portion, and therefore, the inner diameter of the check valve 3 is narrowed from the plug body side toward each top surface portion side. It is provided so that it may protrude. Further, the two contact portions 34 and 34 formed on both sides of the second top surface portion 32a are symmetrical with respect to the second top surface portion 32a, and two contact portions formed on both sides of the third top surface portion 33a. The parts 34 and 34 are the same. The two contact portions 34 and 34 formed on both sides of the first top surface portion 31a are also symmetric with respect to the first top surface portion 31a. Furthermore, each contact portion 34 has a plug body in which the back surface portions of the two slope portion hems that continue from the boundary line 3L are compared to the back surface portions of the two slope surface bodies that continue from the boundary line 3L. It has a form that protrudes rapidly in the direction of closing the main body 21 (in the radial direction of the plug main body 21). This abruptly protruding portion is a portion that first collides with the liquid injection pipe Pi.

  The above-mentioned stopper 1 with a check valve fixes the stopper mounting part 22 to the cup body 5 of the object to be used, for example, the beverage cup 4. As an example of such a cup body 5, as shown in FIGS. 4 and 5, a cylindrical body 51 and a lower end opposite to the upper opening end 51 a of the body 51 are closed. The bottom part 6 is configured as a main part. In this example, the cup body 5 is made of a hard synthetic resin.

The body 51 has a C-shaped cross section at the lower end.
In addition, the bottom 6 not only functions as a bottom that closes the lower end of the body 51, but also allows the liquid to be injected into the inside. More specifically, the bottom 6 is raised while swirling the liquid injected in the horizontal direction. It has a function. The bottom portion 6 having these functions includes a liquid injection port 61 that protrudes inward in the radial direction from one end in the arc direction of the body portion 51 having a C-shaped cross section, and a periphery of the protruding portion of the liquid injection port 61 And a floor 62 that covers the inner side in the radial direction of the body portion 51.

  The floor 62 is a flat floor main body 62a having a substantially semicircular shape in plan view that covers most of the inner side in the radial direction of the body 51 while continuing to the lower end of the liquid inlet 61, and one end in the arc direction of the floor main body 62a. A plan view semicircular arc-shaped slope 62b that inclines while extending along the inner periphery of the body portion 51 in a plan view semicircular arc shape extending from the opposite side of the liquid injection port 61 to the upper end of the liquid injection port 61; And an inner wall 62c that covers the upper and lower ranges from the radial center of the floor main body 62a to the inner periphery of the slope 62b while continuing to the inner end of the inlet 61 (the inner end surface in the radial direction of the body 51). . In this way, the cup body 5 forms a recessed portion 63 that is recessed inward in the radial direction of the body portion 51 at the bottom portion 6 so that the liquid injection port 61 faces the recessed portion 63.

  The liquid inlet 61 is a ring-shaped passage, and the passage direction of the passage coincides with the tangential direction at one end of the floor 62 in the arc direction. The outer peripheral surface of the passage is shaped like a U-shape with two side surfaces extending vertically and a flat upper surface connecting the upper ends of these side surfaces, and the lower surface connecting the lower ends of the two side surfaces is shaped like an arc. It has become. On the other hand, the inner peripheral surface of the passage is cylindrical at the portion surrounding the outer peripheral surface of the plug body 2, and one end portion in the penetrating direction of the inner peripheral surface of the passage, more specifically, the end closer to the inner space of the trunk portion 51. An attachment portion 61a for the check valve plug 1 is formed on the portion, and the attachment portion 61a protrudes in an annular shape toward the inside so as to fit into the annular groove 22c of the attachment portion 22.

  A bushing 9 is used to fix the check valve plug 1 to the liquid inlet 61 (see FIG. 5). The bushing 9 is made of a hard resin that is harder than the stopper 1 with a check valve and is thicker than the plug body 21, and the outer periphery of one end in the penetration direction of the bushing body 91 And an insertion portion 92 extending in the direction of extending the penetrating length from the side. And this insertion part 92 is inserted in the clearance gap between the outer peripheral surface of the stopper 1 with a non-return valve attached to the attachment part 61a of the liquid inlet 61, and the inner peripheral surface other than the attachment part 61a of the liquid inlet 61. Is done.

The beverage cup 4 detailed above is assembled as follows.
(1) Attach the stopper 1 with a check valve to the liquid inlet 61 of the bottom 6. At this time, since the mounting portion 22 protrudes radially outward from the plug body 21, the check valve plug 1 can be easily attached to the liquid inlet 61. More specifically, the annular groove 22c of the mounting portion 22 of the stopper 1 with a check valve 1 is fitted to the mounting portion 61a of the liquid inlet 61 of the bottom portion 6 so that the chevron portions 31, 32, and 33 are located on the inner space side of the bottom portion 6. Let it rush. The mounting portion 22 is easily attached to the attachment portion 61a by the annular groove 22c.
(2) Then, the insertion portion 92 of the bushing 9 is inserted between the liquid inlet 61 and the stopper 1 with a check valve, and the stopper 2 is pushed in by the bushing body 91 of the bushing 9, thereby The valve stopper 1 is fixed to the liquid inlet 61. Assuming a case as shown in FIG. 5 in which the bottom surface of the bottom portion 6 is placed on the table at this time, the second and third top surface portions 32a and 33a of the second and third mountain-shaped portions 32 and 33 are perpendicular to each other. The first top surface portion 31a of the first mountain-shaped portion 31 faces the horizontal direction. That's it.

In order to inject a liquid into the beverage cup 4 assembled in this way, the following is performed.
(1) Place the drinking cup 4 so that the bottom 6 is placed on the table. At this time, the stopper 1 with a check valve is such that the longitudinal direction of the cylindrical plug body 21 is directed in the horizontal direction.
(2) As shown in FIG. 6 (a), when the pipe Pi for liquid injection is inserted from the depression 63 toward the stopper 1 with a check valve, it follows the cylindrical inner peripheral surface of the plug body 21. The end portion of the cylindrical pipe Pi is smoothly inserted into the plug body 21 from the outside of the beverage cup 4.
When inserted, as shown in FIG. 6B, the four abutting portions 34 abut on the tip of the pipe Pi equally. Further, since the four contact portions 34 protrude in the direction of narrowing the inner diameter of the check valve 3 from the plug body side toward the top surface portion side, the distal end portion of the pipe Pi pushes the four contact portions 34 wide as it is inserted deeply. Thus, each chevron 31, 32, 33 of the check valve plug 1, which is an elastic member, is deformed, and the cut 31 b is pushed open at the tip of the pipe Pi. At this time, the cut 31b is deformed into a circular shape, and as shown in FIG. 6 (c), the cut 31b is closely surrounded by the outer peripheral surface of the pipe Pi, so that liquid to be injected thereafter does not leak.
(3) Thereafter, the liquid is poured into the internal space of the beverage cup 4 from the tip side of the pipe Pi. Further, the liquid poured into the beverage cup 4 rises on the slope 62b while turning along the cup body trunk 51, and the flow of the liquid becomes spiral.
(4) When the pipe Pi is pulled out after the liquid has been injected, the cut line 31b that has been deformed up to that point is closed in a straight line to prevent liquid leakage. In addition, even if it puts the drink cup 4 vigorously with the liquid contained, the liquid does not leak from the stopper 1 with a check valve.

The effect | action which prevents a liquid leak is explained in full detail. The fluid pressure accumulated in the cup body 5 is applied to the check valve 3 of the stopper 1 with a check valve. Then, the first top surface portion 31a of the first mountain-shaped portion 31 tends to be deformed in a downward bending direction. However, since the rigidity of the first chevron portion 31 is improved by the second and third chevron portions 32 and 33, even if hydraulic pressure is applied, the shape of the first chevron portion 31 and the cut of the first top surface portion 31a are obtained. The shape of 31b does not need to be extremely deformed, whereby the sealing performance of the cut 31b is improved as compared with the conventional case, and the liquid does not leak easily.
Moreover, since the top surface portions 32a and 33a of the second and third mountain-shaped portions 32 and 33 are made lower than the first top surface portion 31a, the second and third mountain-shaped portions 32 and 33 are a pair of first slopes. Although it deform | transforms so that the part 31e * 31e may be pinched | interposed, since the deformation | transformation does not act directly on the 1st top surface part 31a and the cut 31b, the sealing performance of the cut 31b improves.
Since the first, second, and third chevron portions 31, 32, and 33 are arranged so as to intersect in a cross shape, when hydraulic pressure is applied, the second chevron portion 32 and the third chevron portion 33 are disposed. Since one of the two deforms toward the other and the other acts so as to stop the deformation, the sealing performance of the cut 31b is further improved.
Incidentally, the incision 31b comes into close contact with each other without a gap so that the first slope portion 31e of the first peak portion 31 can easily receive the downward pressure of the hydraulic pressure on the first slope portion 31e. Although it seems that the longitudinal direction of the top surface portion 31a faces the horizontal direction and the first top surface portion 31a easily deforms accordingly, the second and third tops of the second and third mountain-shaped portions 32 and 33 are considered to be easily deformed. It is presumed that the surface portions 32a and 33a act to prevent the deformation of the first top surface portion 31a by facing the vertical direction.

  FIG. 7 shows the stopper 1a with a check valve according to the second embodiment of the present invention. The check valve plug 1a is characterized in that the thickness in the width direction (Y direction) of the first top surface portion 31a is thicker at both longitudinal end portions than the longitudinal center portion of the cut 31b. More specifically, not only the range corresponding to the width (width in the X direction) of the second top surface portion (third top surface portion 33a) 32a in the longitudinal direction of the cut 31b, but also the lower ends of the pair of second slope portion main bodies 32f and 32f The first top surface portion 31a is formed with a small thickness in the width direction in a range corresponding to the space between the lower ends of the pair of third slope portion main bodies 33f and 33f, and the first top surface in a range outside the first top surface portion 31a. The thickness of the surface portion 31a in the width direction is formed symmetrically thick with respect to the cut 31b. When the pipe Pi is inserted into the cut 31b, a force is applied to both ends of the cut 31b so as to tear the first top surface portion 31a. However, according to the second embodiment, the first top surface portion 31a is difficult to tear. In addition, the opening end side of the plug body 21 is tapered so that the inner diameter narrows in a trumpet shape toward the check valve 3 side.

  In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the meaning, it can change suitably. For example, the heights of the second chevron part 32 and the third chevron part 33 are not necessarily the same height and may be different, and the width of the second chevron part 32 and the third chevron part 33. Similarly, the dimension in the direction is not limited to the same, and may be different.

DESCRIPTION OF SYMBOLS 1, 1a Plug with check valve 2 Plug body 21 Plug body main body part 22 Mounting part 22a 1st rod 22b 2nd rod 22c Annular groove 3 Check valve 31 1st peak part 31a 1st top surface part 31b Cut 31e 1st Slope portion 31f First slope portion body 31g First slope portion hem 31h First wall surface portion 31k First cavity portion 32 Second mountain portion 32a Second top surface portion (top surface portion)
32e 2nd slope part 32f 2nd slope part main body 32g 2nd slope part skirt 32h 2nd wall surface part 32k 2nd cavity part 33 3rd peak part 33a 3rd top surface part 33e 3rd slope part 33f 3rd slope part body 33g 3rd slope part hem 33h 3rd wall surface part 33k 3rd cavity 3L boundary line 34 contact part

4 Beverage Cup 5 Cup Body 51 Body 51a Upper Open End 6 Bottom 61 Liquid Injection Port 61a Attachment 62 Floor 62a Floor Body 62b Slope 62c Inner Wall 63 Recessed 9 Bushing 91 Bushing Body 92 Insertion Pi Pipe

Claims (5)

In the stopper with a check valve composed of an elastic member having one end of a cylindrical plug body as an open end and the other end closed with a check valve,
The check valve includes first, second, and third chevron portions that cooperatively block the other end of the stopper, and the second and third chevron portions intersect with the longitudinal direction of the first chevron portion. By doing so, the first, second, and third mountain-shaped portions form a cross shape,
The first mountain-shaped portion includes a straight belt-like first top surface portion, a pair of first slope portions that descend obliquely from both sides in the width direction of the first top surface portion, and descends from both sides in the longitudinal direction of the first top surface portion. And a pair of first wall surfaces connected to the plug body, and the first top surface portion has a cut parallel to the longitudinal direction thereof,
Each of the second and third chevron portions protrudes from the first slope portion in the width direction of the first top surface portion, and is connected to the plug at the lower end thereof .
Second and third top surface portions as belt-like top portions extending in a direction orthogonal to the first top surface portion;
A pair of second and third slope portions that respectively descend obliquely from both sides in the width direction of the second and third top surface portions;
A stopper with a check valve, comprising: a pair of second and third wall surface portions that are lowered from the longitudinal ends of the second and third top surface portions and connected to the plug body .   The stopper with a check valve according to claim 1, wherein each of the top portions of the second and third chevron portions is lower than the first top surface portion. The top, slope and wall surfaces of each of the first, second and third chevron portions are formed in a flat plate shape, and inside the check valve, are spaced in the circumferential direction to a liquid injection tube. A total of four contact portions for contact are formed,
Each contact portion is formed by two adjacent slope portions, and is provided so as to protrude in a direction of narrowing the inner diameter of the check valve from the plug body side to each top surface portion side. The stopper with a check valve according to claim 1 or 2 . The stopper has a check valve according to any one of claims 1 to 3 , wherein the stopper has a tubular stopper body main body and a mounting portion protruding from the outer peripheral surface of the stopper body main body. The stopper with a check valve according to any one of claims 1 to 4 , which is used for a drinking cup.

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