Double container suction pipe

Abstract

To provide a double container which can be applied to various types without being affected by the method of reducing the volume of an inner container and which can lead to a reduction in a remaining amount of a content.SOLUTION: A double container suction pipe 5 provided in a pump mechanism 4 attached to a mouth part 2a of a double container 2 which includes an inner container 10 and an outer container 11 provided with a suction hole for sucking outside air between the outer container and the inner container includes: a pipe body 40 that extends downward from a lower end part of a cylinder 31 and communicates with the inside of the cylinder; a plurality of vertical ribs 41 extending downward from a lower opening edge of the pipe body; and a vertically long slit hole 42 that radially penetrates the pipe body and extends along an axial direction of the pipe body, the vertical ribs extend radially and provide a circumferentially disposed double container suction pipe that goes around the axis.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a suction pipe for a double container. [Background technology]

[0002] BACKGROUND ART Conventionally, as shown in Patent Document 1, for example, a pump mechanism that is attached to the opening of a double container that contains contents has been known. The double container comprises an inner container that accommodates contents and undergoes volume reduction (shrinkage) as the contents decrease, and an outer container in which the inner container is placed. The pump mechanism mainly comprises a cylindrical stem that is erected in an upwardly biased state and is movable downward, a depression head attached to the upper end of the stem, a cylindrical piston that moves in conjunction with the up and down movement of the stem, and a cylindrical cylinder in which the piston is fitted so as to be movable up and down. A suction pipe that sucks up the contents of the inner container is attached to the opening at the lower end of the cylinder. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 5-319468 Summary of the Invention [Problem to be solved by the invention]

[0004] In the case of the above-mentioned conventional double container, when the suction pipe is attached to the pump mechanism, the inner container gradually shrinks and deforms as the contents decrease, and there are cases where the inner container blocks the opening (suction port) of the suction pipe even though the contents still remain.

[0005] In particular, when a so-called dip tube, which has a suction port at the bottom, is used as the suction pipe, in a double-layered container in which the inner container peels off first from the bottom side of the outer container, the suction port is easily blocked by the inner container, which means that a large amount of the contents tends to remain, leaving room for improvement. Furthermore, when a so-called dip bar, which has a support rod formed in a cross section in a cross-section, is used as the suction pipe, the suction port extends vertically. However, in a double-layered container in which the inner container peels off first from the neck side of the outer container, the inner container can easily become entangled or caught in the portion of the suction port located at the upper end of the dip bar, effectively blocking the suction port. Therefore, even in this case, a large amount of the contents tends to remain.

[0006] As such, it was difficult for conventional suction pipes to accommodate both double containers in which the inner container peels off first from the bottom side of the outer container, and double containers in which the inner container peels off first from the neck side of the outer container.

[0007] The present invention was made in consideration of the above circumstances, and its purpose is to provide a suction pipe for double containers that can be applied to various types of double containers regardless of how the volume of the inner container is reduced, and that can lead to a reduction in the amount of remaining contents. [Means for solving the problem]

[0008] (1) The suction pipe for a double container according to the present invention is provided in a pump mechanism attached to the opening of a double container comprising an inner container that stores contents and reduces in volume as the contents decrease, and an outer container in which the inner container is housed and which has an air intake hole between the inner container and the outer container for drawing in outside air. The suction pipe for a double container is provided with a tubular pipe body extending downward from the lower end of the cylinder of the pump mechanism and communicating with the interior of the cylinder, a plurality of vertical ribs extending downward from the edge of the lower end opening of the pipe body, and vertically elongated slit holes formed to penetrate the pipe body in the radial direction and extending along the axial direction of the pipe body, the vertical ribs extending along the radial direction and being arranged along the circumferential direction around the axis. and four of the longitudinal ribs are arranged along the circumferential direction so as to form a cross shape intersecting on the axis in a plan view seen from the axial direction, and two of the four longitudinal ribs have peripheral walls formed on their outer end edges, the peripheral walls extending over the entire length of the longitudinal ribs and in the circumferential direction, and the two longitudinal ribs with the peripheral walls formed are arranged on the same straight line in the plan view, and a plurality of the slit holes are arranged at intervals in the circumferential direction, and the peripheral wall and the slit holes are formed so as to be at different circumferential positions, and a portion of the pipe body located above the peripheral wall is a portion where the slit holes located between the circumferentially adjacent slit holes are not formed. It is characterized by:

[0009] According to the suction pipe for a double container of the present invention, the pump mechanism can be activated by pressing and releasing the pressing head, and the contents can be sucked from the inner container into the cylinder through the pipe body. This allows the contents to be used, for example, by discharging them. As the contents decrease, the inner container shrinks and deforms inside the double container, reducing its volume. This creates negative pressure between the inner container and the outer container, allowing outside air to flow between the inner container and the outer container through the air intake hole. This allows the inner container to maintain its reduced-volume, deformed state.

[0010] In the above process, the pipe body has a plurality of vertical ribs formed on the edge of the lower opening and vertically long slits formed to penetrate radially through it, so that when the contents are sucked up, the contents can be efficiently sucked up using two routes: a first route in which the contents are sucked up from the lower opening of the pipe body through the gaps between the vertical ribs, and a second route in which the contents are sucked up through the slits. In particular, even if the inner container collapses and deforms, for example, so that it covers the periphery of the multiple vertical ribs, the contents can continue to be sucked up by preferentially using the second route that sucks up the contents through the slit holes. Conversely, even if the inner container collapses and deforms, for example, so that it covers the periphery of the slit holes or is caught in the slit holes and blocks them, the contents can continue to be sucked up by preferentially using the first route that sucks up the contents from the lower end opening of the pipe body through the spaces between the multiple vertical ribs.

[0011] In this way, the suction pipe for double containers can use two routes, the first route and the second route, so it can suction up the contents stably and reliably without being affected by how the inner container shrinks and deforms (how the volume is reduced).This means that it can be applied to various types of double containers and can lead to a reduction in the amount of remaining content.

[0013] moreoverThe vertical ribs are arranged in a cross shape in a plan view from the axial direction, making it easy to ensure large intervals between the vertical ribs. This makes it easy to smoothly suck up the contents using the first route that sucks up the contents through the lower end opening of the pipe body. Furthermore, since peripheral walls are formed only on the outer edges of two of the four vertical ribs that are aligned in a straight line in plan view, the peripheral walls prevent problems such as the inner container getting caught in the gaps between the vertical ribs while maintaining smooth suction of the contents. This makes it easier to properly secure the first route, and allows for more stable suction of the contents.

[0015] moreover Since multiple slits are formed, the contents can be sucked up more smoothly using the second route through the slits. In addition, since the circumferential position of the peripheral wall and the circumferential position of the slits are different, for example, when the inner container comes into contact with the outer peripheral surface of the peripheral wall, even if the inner container gradually comes into contact with the outer peripheral surface of the pipe body from below to above starting from this contact point, the slits are unlikely to be blocked. Therefore, it is easy to properly ensure the second route, and the contents can be sucked up more stably. [Effects of the Invention]

[0016] According to the present invention, it can be applied to various types of double containers regardless of the method of reducing the volume of the inner container, and can also lead to a reduction in the amount of remaining content. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a vertical cross-sectional view showing an embodiment of a discharge container equipped with a suction pipe for a double container according to the present invention. [Figure 2] FIG. 2 is a half-longitudinal cross-sectional view of the suction pipe for the double container shown in FIG. [Figure 3] 3 is a side view of the suction pipe for a double container shown in FIG. 2, as seen from the direction of arrow A shown in FIG. [Figure 4] 3 is a plan view of the double container suction pipe shown in FIG. 2 as seen from below. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, an embodiment of the suction pipe for a double container according to the present invention will be described with reference to the drawings. In this embodiment, the suction pipe for a double container is applied to a discharge container having a pump mechanism attached to the double container.

[0019] As shown in Figure 1, the discharge container 1 of this embodiment comprises a cylindrical double container 2 with a bottom in which the contents are stored, a cylindrical attachment cap 3 with a top attached to the mouth 2a of the double container 2, a pump mechanism 4 detachably attached to the mouth 2a of the double container 2 via the attachment cap 3, and a suction pipe 5 (a suction pipe for a double container according to the present invention) provided on the pump mechanism 4. The contents are not particularly limited, but examples thereof include liquid contents such as shampoo, body soap, cosmetics, etc. In particular, the discharge container 1 of the present embodiment can be suitably used with highly viscous (thick) contents such as cream-like contents.

[0020] 1, the central axes of the double container 2, pump mechanism 4, and suction pipe 5 are arranged on a common axis. Hereinafter, this common axis will be referred to as the container axis O, with the side of the push-down head 20 (described later) along the container axis O being referred to as the upper side, and the opposite side, the double container 2 side, being referred to as the lower side. Furthermore, in a plan view seen from the direction of the container axis O, the direction intersecting the container axis O will be referred to as the radial direction, and the direction going around the container axis O will be referred to as the circumferential direction.

[0021] (double container) The double container 2 comprises an inner container 10 that is flexible and accommodates the contents and undergoes volume reduction (shrinkage) as the contents decrease, and an outer container 11 in which the inner container 10 is placed. The double container 2 is, for example, a delaminating container (delamination bottle) in which the inner container 10 is peelably laminated on the inner surface of the outer container 11. Specifically, it is formed by extrusion blow molding using a cylindrical parison formed by laminating a synthetic resin forming the outer container 11 and a synthetic resin of the inner container 10 that has low compatibility with the outer container 11. The materials of the inner container 10 and the outer container 11 are not particularly limited, but for example, the outer container 11 is made of polyethylene or polypropylene, and the inner container 10 is made of ethylene vinyl alcohol copolymer.

[0022] Alternatively, a preform for the outer container 11 and a preform for the inner container 10 may be formed by injection molding or the like, and these may be combined into a double layer (inner and outer) and then biaxially stretched blow molded to form the double container 2. Furthermore, the preform for the outer container 11 may first be biaxially stretched blow molded to form the outer container 11, and then the preform for the inner container 10 may be placed inside, and then the preform for the inner container 10 may be biaxially stretched blow molded to form the double container 2.

[0023] Even in such a case, the material of the inner container 10 and the outer container 11 is not particularly limited, but is, for example, PET (polyethylene terephthalate) resin. However, the materials of the inner container 10 and the outer container 11 may be the same or different as long as they are a separable combination. Examples of synthetic resin materials include PET (polyethylene terephthalate), PP (polypropylene), PE (polyethylene), nylon (polyamide), EVOH (ethylene-vinyl alcohol copolymer), etc. Among these synthetic resin materials, it is preferable that the outer container 11 and the inner container 10 are formed from a single material or a multilayer structure of two or more materials in a combination that allows them to be separable (not miscible).

[0024] The double container 2 is formed in a cylindrical shape with a bottom, in which a mouth portion 2a, a shoulder portion 2b, a body portion 2c, and a bottom portion 2d are connected in this order from the top. The outer container 11 constituting the double container 2 of this embodiment is formed to have a certain rigidity, and is configured to be resistant to squeeze deformation even when the body 2c of the outer container 11 is pressed radially inward (toward the inside of the container).

[0025] In the double container 2 configured as described above, an air intake hole (not shown) is formed in the outer container 11 to draw (introduce) outside air between the outer container 11 and the inner container 10. The position of the air intake hole is not particularly limited, but it may be formed, for example, in a portion located at the bottom 2d of the double container 2. Specifically, a slit in the pinch-off portion formed in the bottom 2d during blow molding can be used as the air intake hole.

[0026] In the discharge container 1 of this embodiment, when not in use, the stem 30 and the push-down head 20, which will be described later, are located at their lowermost positions, and the push-down head 20 is threadedly attached to and held in a regulating tube 32, which will be described later, thereby restricting upward movement of the push-down head 20 relative to the attachment cap 3. On the other hand, when in use, as shown in Fig. 1, the stem 30 and the push-down head 20 are located at their uppermost positions and maintain a standby state for discharge operation.

[0027] (Pump mechanism) The pump mechanism 4 is inserted into the mouth 2 a of the double container 2 and is held inside the mouth 2 a of the double container 2 by the attachment cap 3 . The pump mechanism 4 includes a cylindrical stem 30 that is erected in an upwardly biased state so as to be movable downward, and to which the push-down head 20 is attached at its upper end, a cylindrical piston (not shown) that links to the up and down movement of the stem 30, a cylindrical cylinder 31 into which the piston is fitted so as to be able to move up and down, a piston guide (not shown) that is inserted inside the piston and links to the up and down movement of the stem 30, a lower valve body (not shown) that operates in linkage with the up and down movement of the stem 30 and opens and closes the lower end opening of the cylinder 31 in response to changes in pressure within the cylinder 31, and a regulating cylinder 32 that is attached to the upper end of the cylinder 31 and holds the push-down head 20 at its lowermost position.

[0028] The cylinder 31 is disposed coaxially with the container axis O and extends downward from the opening 2a of the double container 2. A suction tube 33 extending downward is formed at the lower end of the cylinder 31. As a result, the interior of the cylinder 31 and the interior of the double container 2 are in communication with each other through the lower end opening of the cylinder 31 and the inside of the suction tube 33.

[0029] The lower valve body functions as a check valve that closes the lower end opening of the cylinder 31 when the cylinder 31 is pressurized, and opens the lower end opening of the cylinder 31 when the cylinder 31 is depressurized. This makes it possible to restrict the outflow of contents from the cylinder 31 into the double container 2 through the lower end opening when the cylinder 31 is pressurized, and also to allow the inflow of contents from the double container 2 into the cylinder 31 through the lower end opening when the cylinder 31 is depressurized.

[0030] A coil spring (not shown) is disposed between the lower valve body and the piston guide. The coil spring urges the stem 30 and the piston guide upward with its elastic restoring force and elastically deforms as the stem 30 and the piston guide move downward. As a result, the stem 30 is able to move downward while being biased upward by the elastic restoring force of the coil spring transmitted via the piston guide.

[0031] The regulating cylinder 32 has an externally threaded cylinder 32b on which an externally threaded portion 32a is formed. The pressing head 20 comprises a cylindrical operating portion 21 with a top, a fitting tube (not shown) extending downward from the top plate portion of the operating portion 21, a female threaded tube 22 extending downward from the top plate portion and surrounding the fitting tube from the outside in the radial direction, and a discharge tube 23 having a discharge hole 23a formed at the tip.

[0032] The fitting tube has a lower end fitted inside the upper end of the stem 30. An internal thread (not shown) that screws onto the external thread 32a of the regulating tube 32 is formed on the inner peripheral surface of the internal thread tube 22. The internal thread tube 22 screws onto the external thread tube 32b of the regulating tube 32 when the press-down head 20 and the stem 30 are positioned at their lowermost positions. This holds the press-down head 20 and the stem 30 at their lowermost positions.

[0033] Discharge tube 23 is formed to protrude radially outward from the peripheral wall of operating part 21, and is connected to the inside of stem 30 through a fitting tube. This makes it possible to discharge the contents from discharge hole 23a through the inside of stem 30 and discharge tube 23 to the outside.

[0034] (Suction pipe) The suction pipe 5 is disposed coaxially with the container axis O, and is fitted inside the suction tube 33 of the cylinder 31 in the pump mechanism 4. As shown in Figures 1 to 4, the suction pipe 5 extends downward from the lower end of the cylinder 31 and includes a cylindrical pipe body 40 that is connected to the interior of the cylinder 31, a plurality of vertical ribs 41 that extend downward from the lower end opening edge of the pipe body 40, and a plurality of vertically elongated slit holes 42 that are formed to radially penetrate the pipe body 40 and extend in the vertical direction.

[0035] The pipe body 40 is formed in a cylindrical shape with an outer diameter slightly smaller than the inner diameter of the suction tube 33, and is disposed coaxially with the container axis O. The upper end of the pipe body 40 is inserted into the inside of the suction tube 33 from below, and thereby fits tightly inside the suction tube 33. An annular seal projection 43 that projects radially outward is formed on the outer peripheral surface of the upper end of the pipe body 40 around the entire circumference of the pipe body 40.

[0036] The plurality of vertical ribs 41 extend in the radial direction and are arranged in the circumferential direction around the container axis O. In this embodiment, four vertical ribs 41 are arranged along the circumferential direction so as to form a cross shape intersecting on the container axis O in a plan view seen from the container axis O direction. These four vertical ribs 41 are formed so as not to protrude radially outward beyond the outer circumferential surface of the pipe body 40. Furthermore, the four vertical ribs 41 are formed so as to extend downward by the same length. The lower ends of the four vertical ribs 41 are arranged above the bottom 2d of the double container 2.

[0037] Of the four vertical ribs 41, two vertical ribs 41 that face each other in the radial direction across the container axis O function as a first set of vertical ribs 45. Of the four vertical ribs 41, the remaining two vertical ribs 41 function as a second set of vertical ribs 46 that face each other in the radial direction across the container axis O. Therefore, the first set of longitudinal ribs 45 are arranged on the same straight line in a plan view, and the second set of longitudinal ribs 46 are also arranged on the same straight line in a plan view.

[0038] Of these, peripheral walls 47 are formed on the outer edges of the first set of vertical ribs 45, extending over the entire length of the vertical rib 41 and in the circumferential direction. The peripheral walls 47 are formed to extend from the outer edges of the first set of vertical ribs 45 toward the outer edges of the second set of vertical ribs 46 adjacent in the circumferential direction.

[0039] The multiple slit holes 42 are arranged at intervals in the circumferential direction in the central portion of the suction pipe 5. In this embodiment, three slit holes 42 are formed at equal intervals around the container axis O. The slit holes 42 are formed vertically long so that, when the suction pipe 5 is attached, the upper open end is located below the suction tube 33 and the lower open end is located above the lower end of the pipe main body 40.

[0040] Furthermore, the peripheral wall 47 and the slit holes 42 are formed at different circumferential positions, so that the portion of the pipe body 40 located above the peripheral wall 47 is a portion where no slit holes 42 are formed and located between circumferentially adjacent slit holes 42, as shown in Fig. 3 .

[0041] (Action of the suction pipe) Next, the situation where the content is discharged using the dispensing container 1 configured as described above will be explained, and the action of the suction pipe 5 in this process will be explained.

[0042] When discharging the contents, as shown in FIG. 1, the pump mechanism 4 can be operated by pressing down the push-down head 20, which is located at the uppermost position, and then releasing the press-down operation, and the contents can be sucked up from the inner container 10 into the cylinder 31 through the pipe body 40.

[0043] To put it simply, by pressing down the press-down head 20, the stem 30 and the piston guide can be moved downward. This causes the piston to move downward, and the inside of the cylinder 31 can be pressurized. This causes the contents in the cylinder 31 to flow into the stem 30. Therefore, the contents in the stem 30 can be discharged to the outside through the discharge tube 23 of the press-down head 20 and the discharge hole 23a.

[0044] After the contents have been discharged, when the push-down head 20 is released, the upward biasing force (elastic restoring force) of the coil spring causes the piston guide, piston, stem 30, and push-down head 20 to move upward and return to their original position. This reduces the pressure inside the cylinder 31, causing the lower valve body to open the lower end opening of the cylinder 31, allowing the contents inside the inner container 10 to be sucked up into the cylinder 31 through the suction pipe 5 and the lower end opening. As a result, the cylinder 31 is ready for the next content discharge operation by pressing down the push-down head 20.

[0045] As the contents decrease, the inner container 10 shrinks and deforms inside the double container 2, reducing its volume. This creates a negative pressure between the inner container 10 and the outer container 11, which allows outside air to flow into the space between the inner container 10 and the outer container 11 through the air intake hole. This allows the inner container 10 to be maintained in its reduced-volume, deformed state. As a result, the contents can be discharged while gradually reducing the volume of the inner container 10. This makes it possible to prevent oxidation, deterioration, and alteration of the contents, thereby maintaining the added value of maintaining the quality of the contents.

[0046] In the above process, the pipe body 40 has a plurality of vertical ribs 41 formed on the edge of the lower end opening, and a plurality of vertically elongated slit holes 42 formed so as to penetrate radially. Therefore, when sucking up the contents, the contents can be efficiently sucked up using two routes: a first route in which the contents are sucked up from the lower end opening of the pipe body 40 through the gaps between the plurality of vertical ribs 41, and a second route in which the contents are sucked up through the plurality of slit holes 42.

[0047] In particular, even if the inner container 10 shrinks and deforms, for example, so that the inner container 10 covers the periphery of the plurality of vertical ribs 41, the second route for sucking up the contents through the plurality of slit holes 42 can be used preferentially to continue sucking up the contents. On the other hand, even if the inner container 10 shrinks and deforms, for example, so that the inner container 10 covers the periphery of the multiple slit holes 42 or gets caught in the slit holes 42, blocking the slit holes 42, the contents can continue to be sucked up by preferentially using the first route that sucks up the contents from the lower end opening of the pipe body 40 through the spaces between the multiple vertical ribs 41.

[0048] As described above, the suction pipe 5 of this embodiment can utilize two routes, the first route and the second route, and therefore can suction up the contents stably and reliably without being affected by the way the inner container 10 shrinks and deforms (how it reduces in volume). Therefore, it can be applied to various types of double containers 2 and can also lead to a reduction in the amount of remaining contents.

[0049] Specifically, when a conventional dip tube was used as the suction pipe, it was confirmed that the amount of contents remaining in the double container 2 was on average 11% (minimum 9%, maximum 16%). Furthermore, when a conventional dip bar was used as the suction pipe, it was confirmed that the amount of contents remaining in the double container 2 was on average 7% (minimum 6%, maximum 9%). In contrast, when the suction pipe 5 of this embodiment was used, it was confirmed that the amount of contents remaining in the double container 2 was on average 5% (minimum 3%, maximum 9%).

[0050] As described above, the suction pipe 5 of this embodiment can utilize two routes, the first route and the second route, which can effectively reduce the amount of remaining content. Note that the above-mentioned remaining amount was confirmed under the same conditions and with the same configurations and conditions other than the suction pipe 5.

[0051] As described above, the suction pipe 5 of this embodiment can be applied to various types of double containers 2 regardless of how the volume of the inner container 10 is reduced, and can also lead to a reduction in the amount of remaining contents.

[0052] Furthermore, in this embodiment, the multiple vertical ribs 41 are arranged in a cross shape in a plan view, making it easy to ensure large intervals between the multiple vertical ribs 41. Therefore, the contents can be easily sucked up smoothly using the first route that sucks up the contents through the lower end opening of the pipe body 40. Furthermore, since the peripheral wall 47 is formed only on the outer edge of the first set of vertical ribs 45, it is possible to maintain smooth suction of the contents while preventing problems such as the inner container 10 getting caught in the gaps between the multiple vertical ribs 41. This makes it easier to properly secure the first route, and allows for more stable suction of the contents.

[0053] Furthermore, since the circumferential position of the peripheral wall 47 and the circumferential position of the slits 42 are different, for example, when the inner container 10 comes into contact with the outer peripheral surface of the peripheral wall 47, even if the inner container 10 gradually comes into contact with the outer peripheral surface of the pipe body 40 from below upward starting from this contact point, the slits 42 are unlikely to be blocked. This makes it easier to properly secure the second route, and allows the contents to be suctioned more stably.

[0054] Although the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. The present embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. Furthermore, the present embodiments and their modifications include, for example, those that can be easily imagined by a person skilled in the art, those that are substantially the same, and those that are equivalent.

[0055] For example, in the above embodiment, a laminated peelable container in which the inner container 10 is peelably laminated on the inner surface of the outer container 11 is used as an example, but this is not limited to this case, and for example, a double container in which a gap is secured between the inner container 10 and the outer container 11 may also be used. Furthermore, in the above embodiment, the intake holes are formed in the bottom 2d of the double container 2, but this is not limited to this case, and they may be formed in the mouth or body of the outer container 11, for example.

[0056] Furthermore, in the above embodiment, an example was described in which three slit holes 42 were formed, but the number of slit holes 42 may be changed as appropriate. Furthermore, in the above embodiment, four vertical ribs 41 were formed, but the number of vertical ribs 41 may also be changed as appropriate. Furthermore, in the above embodiment, the four vertical ribs 41 were arranged in a cross shape in a plan view, but this is not limited to this. For example, multiple vertical ribs 41 may be arranged radially around the container axis O in a plan view. [Explanation of symbols]

[0057] 2…Double container 4...Pump mechanism 5...Suction pipe (suction pipe for double container) 10…Inner container 11...Outer container 31...Cylinder 40...Pipe body 41...Vertical rib 42...Slit hole 47...peripheral wall

Claims

[Claim 1] A suction pipe for a double container is provided in a pump mechanism attached to the opening of the double container, which includes an inner container that stores contents and reduces in volume as the contents decrease, and an outer container in which the inner container is housed and which has an air intake hole between the inner container and the outer container for drawing in outside air, a cylindrical pipe body extending downward from a lower end of a cylinder of the pump mechanism and communicating with the interior of the cylinder; a plurality of vertical ribs extending downward from the lower end opening edge of the pipe body; a vertically elongated slit hole formed to penetrate the pipe body in the radial direction and extending along the axial direction of the pipe body; The vertical ribs extend along the radial direction and are arranged along a circumferential direction around the axis, and four of the vertical ribs are arranged along the circumferential direction so as to form a cross shape intersecting on the axis in a plan view seen from the axial direction, Two of the four longitudinal ribs have outer end edges formed with peripheral walls extending over the entire length of the longitudinal ribs and in the circumferential direction, The two vertical ribs on which the peripheral walls are formed are arranged on the same straight line in the plan view, The slit holes are arranged at intervals in the circumferential direction, A suction pipe for a double container, characterized in that the peripheral wall and the slit holes are formed so that they are at different circumferential positions, and the portion of the pipe body located above the peripheral wall is a portion where the slit holes are not formed and is located between adjacent circumferential slit holes.

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