Double container

Abstract

This prevents the inner container from cracking when subjected to impacts such as drops. [Solution] The device comprises a bottomed cylindrical inner container 20 in which the contents are contained, and a bottomed cylindrical outer container 10 in which the inner container 20 is contained. A protrusion 14 projecting upward is provided at the radial center of the upper surface of the outer bottom wall 12 of the outer container 10. The upper end surface 14a of the protrusion 14 extends along the portion of the lower surface 22a of the inner bottom wall 22 of the inner container 20 that is vertically opposite to the upper end surface 14a of the protrusion 14 in a vertical cross-sectional view along the vertical direction.

Description

Technical Field

[0001] The present invention relates to a double container.

Background Art

[0002] Patent Document 1 discloses a double container including a bottomed cylindrical inner container for containing contents and a bottomed cylindrical outer container for containing the inner container. As a double container, one in which the center of the bottom of the outer container is convex inward is known. In such a container, usually, the inner container and the convex portion of the outer container are not in contact with each other.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In this type of double container, when the inner container and the outer container come into contact with each other due to an impact such as a fall, when the lower surface of the inner container and the convex portion of the outer container come into point contact, the force concentrates on the contact portion and the inner container cracks, which has been a problem.

[0005] The present invention has been made in consideration of such circumstances, and an object thereof is to provide a double container capable of preventing cracking of the inner container when an impact such as a fall is applied.

Means for Solving the Problems

[0006] To solve the above problems, a double-walled container according to one aspect of the present invention comprises a bottomed cylindrical inner container in which contents are contained, and a bottomed cylindrical outer container in which the inner container is contained, wherein a convex portion projecting upward is provided at the radial center of the upper surface of the bottom wall of the outer container, and the upper end surface of the convex portion extends along the portion of the lower surface of the bottom wall of the inner container that is vertically opposite to the upper end surface of the convex portion in a vertical cross-sectional view along the vertical direction.

[0007] According to the above embodiment, the upper end surface of the protrusion provided on the upper surface of the bottom wall of the outer container extends along the portion of the lower surface of the bottom wall of the inner container that is vertically opposite to the upper end surface of the protrusion in a vertical cross-sectional view along the vertical direction. Therefore, when the double container is dropped and the lower surface of the bottom wall of the inner container and the upper surface of the bottom wall of the outer container come into contact with each other due to impact, the upper end surface of the protrusion and the lower surface of the bottom wall of the inner container make surface contact. This prevents the load from concentrating on the surface contact area and causing the inner container to crack.

[0008] Here, the protrusion extends downward from the upper end surface and has an outer peripheral surface connected to the upper surface of the bottom wall of the outer container, and the connection portion between the upper end surface of the protrusion and the outer peripheral surface of the protrusion may have a curved shape that protrudes diagonally upward in a vertical cross-sectional view along the vertical direction, facing radially outward.

[0009] In this case, when the double container is dropped, the connection between the upper end surface of the protrusion and the outer circumferential surface of the protrusion, which is prone to applying a large impact force to the bottom wall of the inner container, has a curved shape that protrudes diagonally upward and outward in a vertical cross-sectional view along the vertical direction, and is not sharp. Therefore, when the protrusion and the bottom surface of the bottom wall of the inner container come into contact with each other, the load applied to the bottom surface of the bottom wall of the inner container can be reliably suppressed. [Effects of the Invention]

[0010] According to the above-described aspect of the present invention, a double-walled container can be provided that can prevent cracking when subjected to impact such as dropping. [Brief explanation of the drawing]

[0011] [Figure 1]This is a semi-vertical cross-sectional view of a double-walled container according to an embodiment. [Figure 2] Figure 1 is a semi-vertical cross-sectional view of the bottom of the double-walled container. [Modes for carrying out the invention]

[0012] The double-walled container of the embodiment will be described below with reference to the drawings. As shown in Figure 1, the double-walled container 1 comprises an outer container 10, an inner container 20, a dispenser 30, a middle tray 40, and a lid 50. The inner container 20 is formed in a bottomed cylindrical shape and contains contents inside. The outer container 10 is also formed in a bottomed cylindrical shape and houses the inner container 20 inside it.

[0013] The double-walled container 1 is a so-called inner tray rising type, in which the inner tray 40 rises as the amount of contents filled in the inner container 20 decreases. The contents are not particularly limited, but cosmetics that are easily altered or deteriorated by the effects of light are preferably used. However, the contents do not have to be such cosmetics.

[0014] The dispenser 30 is attached to the opening 10a of the outer container 10 and dispenses the contents. The inner tray 40 is placed inside the inner container 20. The lid 50 is formed in a top-cylindrical shape and covers the push-down head 31 of the dispenser 30 (described later), and is detachably attached to the mounting cap 35 of the dispenser 30 (described later). Furthermore, the inner container 20 can be used as a refill container, and the inner container 20 can be replaced with a new one as needed.

[0015] In this embodiment, the outer container 10, inner container 20, dispensing device 30, inner tray 40, and lid 50 are all arranged with their respective central axes on a common axis. Hereinafter, this common axis will be referred to as the container axis O, and the direction along the container axis O will be referred to as the vertical direction. In the vertical direction, the side of the outer bottom wall 12 of the outer container 10 is referred to as the downward direction, and the side of the opening 10a is referred to as the upward direction. In a plan view from the vertical direction, the direction intersecting the container axis O is referred to as the radial direction, and the direction revolving around the container axis O is referred to as the circumferential direction. In the following explanation, the state in which the double container 1 is placed upright on a surface such as a desk is referred to as the standby state.

[0016] In the standby state, the double container 1 has a gap between the inner surface of the outer container 10 and the outer surface of the inner container 20, at least along its entire vertical length.

[0017] The outer container 10 has an outer peripheral wall 11, an outer bottom wall 12, and an outer opening 13.

[0018] The outer circumferential wall 11 of the outer container 10 is formed in a substantially cylindrical shape. The outer diameter of the outer circumferential wall 11 gradually increases from the lower end upwards. In a longitudinal cross-sectional view, the outer surface of the outer circumferential wall 11 is almost straight from its upper end to its lower end. In a plan view, the inner surface of the outer circumferential wall 11 is formed in a circular shape.

[0019] The outer opening 13 is formed in a cylindrical shape. The inner circumferential surface of the outer opening 13 is flush with the outer circumferential surface of the mounting cap 35, which will be described later. The outer diameter of the outer opening 13 is larger than the outer diameter of the mounting cap 35. A first fitting portion 13a is formed on the inner circumferential surface of the outer opening 13, projecting radially inward. The first fitting portion 13a extends circumferentially around the entire circumference of the outer opening 13. However, the first fitting portion 13a may be provided intermittently along the circumferential direction. The upper end opening of the outer opening 13 is the opening 10a of the outer container 10.

[0020] As shown in FIG. 2, the outer bottom wall 12 is located at the bottom of the double container 1 and covers the inner bottom wall 22 of the inner container 20 from below. A convex portion 14 protruding upward is provided at the radial center of the upper surface 12a of the outer bottom wall 12. The upper end surface 14a of the convex portion 14 extends along a portion of the lower surface 22a of the inner bottom wall 22 of the inner container 20 that faces the upper end surface 14a of the convex portion 14 in the vertical direction in a longitudinal sectional view along the vertical direction. The opposing surfaces of the lower surface 22a of the inner bottom wall 22 and the upper end surface 14a of the convex portion 14 have the same shape (the same curved surface).

[0021] The convex portion 14 extends downward from the upper end surface 14a and has an outer peripheral surface 14b connected to the upper surface 12a of the outer bottom wall 12 of the outer container 10. The connecting portion 14c between the upper end surface 14a of the convex portion 14 and the outer peripheral surface 14b of the convex portion 14呈a protruding curved shape obliquely upward facing the outer side in the radial direction in a longitudinal sectional view along the vertical direction.

[0022] As shown in FIG. 1, the inner container 20 has an inner peripheral wall 21, an inner bottom wall 22, an inner mouth portion 23, and a first engaging portion 24.

[0023] The inner peripheral wall 21 is formed in a substantially cylindrical shape. The first engaging portion 24 is formed on the outer peripheral surface of the upper portion 21a of the inner peripheral wall 21. A plurality of first engaging portions 24 are formed at intervals in the circumferential direction. Each first engaging portion 24 engages with a mounting cap 35 described later.

[0024] The inside of the inner container 20 is vertically separated by a middle plate 40. In this embodiment, in the internal space of the inner container 20, the portion located above the middle plate 40 is a liquid chamber, and the portion located below the middle plate 40 is an air chamber. The content is accommodated in the liquid chamber. The air chamber communicates with the outside of the inner container 20 through an outside air introduction hole 20c.

[0025] As shown in Figure 2, in a plan view, the outer surface of the inner circumferential wall 21 of the inner container 20 is formed in a circular shape. In a bottom view, the shape of the outer surface of the inner circumferential wall 21 of the inner container 20 is a smaller version of the shape of the inner circumferential wall 11 of the outer container 10 in a plan view. The inner diameter of the inner circumferential wall 21 gradually increases from the lower end of the inner circumferential wall 21 upwards.

[0026] The inner bottom wall 22 has a cylindrical inner guide portion 25 that extends upward. The central portion of the lower surface 22a of the inner bottom wall 22 faces the upper end surface 14a of the convex portion 14 of the outer bottom wall 12 described above.

[0027] As shown in Figure 1, the dispenser 30 comprises a push head 31 having a discharge nozzle 32 from which the contents are discharged, a stem 33, a cylinder 34, and a mounting cap 35. The dispenser 30 also comprises a piston member (not shown) disposed to slide vertically within the cylinder 34, and a biasing member (not shown) that biases the stem 33 upward. The dispenser 30 is configured to draw the contents from the inner container 20 into the cylinder 34 as the push head 31 moves up and down, and to discharge the contents from the discharge nozzle 32. The stem 33, cylinder 34, and mounting cap 35 are arranged coaxially with the container axis O.

[0028] The mounting cap 35 is attached to the outer opening 13 of the outer container 10 and the inner opening 23 of the inner container 20. The cylinder 34 is assembled to the mounting cap 35 and is also disposed inside the outer container 10. The stem 33 extends upward from the cylinder 34 and is provided to be able to descend while biased upward. The push head 31 is formed in a top-cylindrical shape and is attached to the upper end of the stem 33. The discharge nozzle 32 protrudes radially outward from the peripheral wall of the push head 31.

[0029] The inner tray 40 has a partition wall portion 41 that divides the inside of the inner container 20 into a liquid chamber and an air chamber, a sliding cylinder portion 43 that is slidably fitted inside the inner container 20, and a connecting portion 42 that connects the partition wall portion 41 and the sliding cylinder portion 43. The partition wall portion 41 and the connecting portion 42 close the radially inner side of the sliding cylinder portion 43. The sliding cylinder portion 43 is fitted so as to be able to slide up and down while in close contact with the inner surface of the inner circumferential wall 21. The inner tray 40 is configured to rise inside the inner circumferential wall 21 as the liquid chamber becomes negatively pressurized as the contents inside the inner container 20 decrease.

[0030] When the push head 31 is pressed, the discharger 30 is activated and the contents are discharged from the discharge nozzle 32, which reduces the amount of contents in the liquid chamber of the inner container 20. As a result, negative pressure is created in the liquid chamber, and this negative pressure causes the inner tray 40 to rise. As the inner tray 40 rises, outside air is introduced into the air chamber through through holes (not shown), etc. When the amount of contents remaining in the liquid chamber becomes small, the inner tray 40 rises to the upper end within the inner circumferential wall 21 of the inner container 20.

[0031] Next, we will explain the operation of the double container 1 configured as described above. In the double-walled container 1 according to this embodiment, the upper end surface 14a of the protrusion 14 provided on the upper surface 12a of the outer bottom wall 12 of the outer container 10 extends along the portion of the lower surface 22a of the inner bottom wall 22 of the inner container 20 that is vertically opposite to the upper end surface 14a of the protrusion 14 in a vertical cross-sectional view along the vertical direction. Therefore, when the double-walled container 1 is dropped and the lower surface 22a of the inner bottom wall 22 of the inner container 20 and the upper surface 12a of the outer bottom wall 12 of the outer container 10 come into contact with each other due to impact, the upper end surface 14a of the protrusion 14 and the lower surface 22a of the inner bottom wall 22 of the inner container 20 come into contact over a surface. As a result, it is possible to prevent the inner container 20 from cracking due to the concentration of load on the surface contact area.

[0032] Furthermore, the convex portion 14 has an outer peripheral surface 14b that extends downward from the upper end surface 14a of the convex portion 14 and is connected to the upper surface 12a of the outer bottom wall 12 of the outer container 10, and the connection portion 14c between the upper end surface 14a of the convex portion 14 and the outer peripheral surface 14b of the convex portion 14 may have a curved shape that protrudes diagonally upward and outward in a vertical cross-sectional view along the vertical direction. With this configuration, when the double container 1 is dropped, a large impact force is easily applied to the inner bottom wall 22 of the inner container 20. Because the connection portion 14c between the upper end surface 14a of the convex portion 14 and the outer peripheral surface 14b of the convex portion 14 has a curved shape that protrudes diagonally upward and outward in a vertical cross-sectional view along the vertical direction and is not sharp, the load applied to the lower surface 22a of the inner bottom wall 22 of the inner container 20 can be reliably suppressed when the convex portion 14 and the lower surface 22a of the inner bottom wall 22 of the inner container 20 come into contact with each other.

[0033] The technical scope of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention.

[0034] For example, in this embodiment, the double-walled container 1 is of the type where the inner tray rises, but a jar container in which contents such as cream are contained in the inner container 20 may also be applied.

[0035] Furthermore, in this embodiment, the protrusion 14 has an outer peripheral surface 14b that extends downward from the upper end surface 14a of the protrusion 14 and is connected to the upper surface 12a of the outer bottom wall 12 of the outer container 10. The connection portion between the upper end surface 14a of the protrusion 14 and the outer peripheral surface 14b of the protrusion 14 exhibits a curved shape that protrudes diagonally upward in a vertical cross-sectional view along the vertical direction, facing outward in the radial direction. However, it is also acceptable for the connection to be made at a corner.

[0036] Furthermore, without departing from the spirit of the present invention, it is possible to replace the components in the above-described embodiments with well-known components, and the above-described embodiments and modifications may be combined as appropriate. [Explanation of symbols]

[0037] 1…Double container, 10…Outer container, 11…Outer peripheral wall, 12…Outer bottom wall, 12a…Top of outer bottom wall, 14…Protrusion, 14a…Upper end face, 14b…Outer peripheral surface, 14c…Connecting part, 20…Inner container, 21…Inner peripheral wall, 22…Inner bottom wall, 22a…Bottom of inner bottom wall, 30…Ejector, 40…Middle dish, O…Container axis

Claims

1. A bottomed cylindrical inner container in which the contents are contained, The system comprises a bottomed cylindrical outer container in which the inner container is housed, A convex portion projecting upward is provided at the radial center of the upper surface of the bottom wall of the outer container. The upper end surface of the protrusion extends along the portion of the lower surface of the bottom wall of the inner container that faces the upper end surface of the protrusion in the vertical direction, as viewed in a vertical cross-sectional view along the vertical direction, in a double-walled container.

2. The aforementioned protrusion extends downward from the upper end surface and has an outer peripheral surface connected to the upper surface of the bottom wall of the outer container, The double-walled container according to claim 1, wherein the connection portion between the upper end surface of the protrusion and the outer peripheral surface of the protrusion exhibits a curved shape that protrudes diagonally upward and outward in a vertical cross-sectional view along the vertical direction.

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