Discharge device and discharge container

Abstract

To provide a dispensing fixture capable of being used for dispensing contents containing solids while improving recyclability and a dispensing container using the same.SOLUTION: A dispensing fixture 1 and a dispensing container 2 include a mounting cap 10, a head part 30, a nozzle 40, a first check valve 50 disposed at an outlet 35 of the head part 30, a second check valve 60 disposed at an inlet 11d of the mounting cap 10, an elastic deformation part 70 provided in the head part 30, a tube holder 13 integrally provided on the mounting cap 10, a cylinder member 80 positioned between the tube holder 13 and a mouth part 3a, and a piston member 90 movable inside the cylinder member 80, and a plate spring part 85 that biases the piston member 90 towards a closed position. The elastic deformation part 70 is elastically deformed so that the head part 30 functions as a pump and the piston member 90 moves to an open position to introduce outside air into the interior of a container body 3.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a discharging tool and a discharging container that are attached to the mouth of a container body and discharge the contents stored in the container body.

Background Art

[0002] As a discharging tool that is attached to the mouth of a container body and discharges the contents stored in the container body, there is a pump-type one having a mounting cap attached to the mouth of the container body, a head portion provided with a nozzle, a cylinder held by the mounting cap, and a piston disposed inside the cylinder. When the head portion is pushed down, the pump operates and the contents stored in the container body are discharged from the nozzle.

[0003] On the other hand, in a pump-type discharging tool, it is common to use a highly rigid metal one as an elastic member for returning the pushed-down head portion to its original position. However, when using a metal one as the elastic member, the recyclability after use decreases, so there is room for improvement in terms of environmental response.

[0004] Therefore, in order to increase the recyclability, a product has been developed that uses a synthetic resin such as polyacetal resin instead of a metal one as an elastic member for returning the pushed-down head portion to its original position (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, while conventional pump-type dispensing devices can improve recyclability by using elastic components made of synthetic resin, they have a problem in that they cannot be used for applications such as dispensing solid materials like abrasives, because the piston slides inside the cylinder.

[0007] The present invention was developed to solve these problems, and its objective is to provide a dispensing device and a dispensing container using the same that can be used for dispensing contents containing solid matter while improving recyclability. [Means for solving the problem]

[0008] The discharge device of the present invention comprises a mounting cap attached to the mouth of a container body, a head portion supported by the mounting cap and having a top wall portion and a cylindrical peripheral wall, and a discharge hole communicating with an outlet provided in the head portion, a first check valve positioned at the outlet portion which prevents the flow of contents from the discharge hole toward the interior of the head portion and allows the flow of contents from the interior of the head portion toward the discharge hole, and an inlet provided in the mounting cap which prevents the flow of contents from the interior of the head portion toward the interior of the container body and allows the flow of contents from the interior of the container body A second check valve that allows the contents to flow inward into the head portion; an elastic deformation portion provided in the head portion that elastically deforms to reduce the volume of the head portion when the top wall portion is pressed down, thereby allowing the head portion to function as a pump; a cylindrical tube holder formed with vertical grooves opening downward on its outer circumference, integrally provided with the mounting cap and connected to the inlet; and a tube holder positioned between the tube holder and the mouth portion, with its upper end communicating with the outside via an outside air intake passage between the mounting cap and the mouth portion and its lower end connected to the inside of the container body. A ring-shaped component comprising a cylinder member communicating with a tube holder and an inner seal portion and an outer seal portion, moves vertically within the cylinder member between a closed position where the inner seal portion contacts the outer circumferential surface of the tube holder over its entire circumference above the vertical groove and the outer seal portion contacts the inner circumferential surface of the cylinder member over its entire circumference, and an open position where the inner seal portion contacts the outer circumferential surface of the tube holder over its entire circumference and the outer seal portion contacts the inner circumferential surface of the cylinder member over its entire circumference in the portion where the vertical groove is provided. The device comprises a flexible piston member and a leaf spring portion integrally provided with the cylinder member, which, when the piston member moves to the open position, is pressed by the piston member and elastically deforms to bias the piston member toward the closed position. The device is configured such that when the top wall portion is pushed down, the elastically deformed portion elastically deforms toward the inside of the peripheral wall, causing the head portion to function as a pump, and when the top wall portion returns to its original position, the piston member moves from the closed position to the open position, allowing outside air to be introduced into the container body.

[0009] In the discharge device of the present invention, in the above configuration, it is preferable that the elastically deformable portion is provided in a region extending from the back side facing the opposite side from the nozzle across the axis of the head portion toward both side sides, and is formed to be thinner than other regions of the peripheral wall, or is formed to be softer than other regions of the peripheral wall by insert molding of a soft material, thereby allowing for easier elastic deformation than other regions of the peripheral wall.

[0010] In the discharge device of the present invention, it is preferable that the piston member has a tapered surface that gradually decreases in diameter downward, and that when the piston member moves to the open position, the leaf spring portion is pressed by the tapered surface.

[0011] The discharge container of the present invention is characterized by comprising the container body and the discharge device. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a dispensing device and a dispensing container using the same that can be used for dispensing contents containing solid matter while improving recyclability. [Brief explanation of the drawing]

[0013] [Figure 1] This is a cross-sectional view of the discharge device portion of a discharge container equipped with a discharge device according to one embodiment of the present invention. [Figure 2] This is a cross-sectional view showing an enlarged view of area A shown in Figure 1. [Figure 3] Figure 1 is a cross-sectional view of the dispensing device portion of the dispensing container shown in Figure 1, in a state where the top wall is being pressed down to dispense the contents. [Figure 4] Figure 1 shows a cross-sectional view of the dispensing device portion of the dispensing container after the top wall has been pressed down to dispense the contents and then the pressure on the top wall has been released. [Modes for carrying out the invention]

[0014] Hereinafter, with reference to the drawings, the applicator 1 and the discharge container 2 according to an embodiment of the present invention will be exemplified and described in detail.

[0015] In this embodiment and the claims, the vertical direction means the vertical direction in the state where the discharge container 2 is in the upright posture as shown in FIG. 1.

[0016] As shown in FIG. 1, the applicator 1 is assembled to the container body 3. The discharge container 2 is configured to include the applicator 1 and the container body 3.

[0017] As the container body 3, for example, a blow-molded bottle made of a synthetic resin material having a bottle shape including a cylindrical mouth portion 3a and a bottomed cylindrical body portion 3b connected to the mouth portion 3a can be used. A male screw 3c is integrally provided on the outer peripheral surface of the mouth portion 3a.

[0018] Note that the container body 3 may have various configurations with different shapes, materials, manufacturing methods, etc., as long as it includes the mouth portion 3a and is configured to be able to store the contents therein.

[0019] The applicator 1 includes a mounting cap 10 that is mounted on the mouth portion 3a of the container body 3. In this embodiment, the mounting cap 10 is configured such that the cap body 11, the support portion 12, and the tube holder 13 are integrally formed of a synthetic resin material.

[0020] More specifically, the cap body 11 has a toped cylindrical shape having a cylindrical peripheral wall portion 11a and a top wall portion 11b centered on the axis O, and an internal thread 11c is integrally provided on the inner peripheral surface of the peripheral wall portion 11a. Further, the axis of the top wall portion 11b is a concave portion recessed downward, and an inlet 11d penetrating the top wall portion 11b in the vertical direction is provided at the axis of this concave portion.

[0021] The cap body 11 is detachably attached to the mouth portion 3a of the container body 3 by screw - coupling the female screw 11c thereof to the male screw 3c provided on the mouth portion 3a of the container body 3. When the cap body 11 is attached to the mouth portion 3a of the container body 3, the ejector 1 is in a state assembled to the container body 3.

[0022] Note that the cap body 11 is not limited to the configuration of being attached to the mouth portion 3a of the container body 3 by screw - coupling the male screw 3c and the female screw 11c. For example, it can also be configured to be attached to the mouth portion 3a of the container body 3 by other configurations such as plugging using under - cut engagement. Also, as long as the cap body 11 can be attached to the mouth portion 3a of the container body 3, its shape can be variously changed.

[0023] The support body portion 12 is cylindrical with the axis O as the center and extends upward from the upper surface of the top wall portion 11b.

[0024] The tube holder 13 is cylindrical with the axis O as the center and is integrally provided continuously at the peripheral edge portion of the inlet 11d of the top wall portion 11b. That is, the tube holder 13 communicates with the inlet 11d at the upper end. The suction tube 20 is fitted and fixed inside the tube holder 13. The suction tube 20 communicates with the inlet 11d and extends downward from the tube holder 13, and its lower end (not shown) is close to the bottom portion inside the container body 3.

[0025] On the outer peripheral surface of the tube holder 13, a vertical groove 14 that is open downward is provided. At least one vertical groove 14 may be provided on the outer peripheral surface of the tube holder 13, but it is preferable to provide a plurality of them at intervals in the circumferential direction.

[0026] As shown in Figure 2, in this embodiment, the tube holder 13 has a lower portion 13b with an outer diameter slightly smaller than the outer diameter of the upper portion 13a, and the vertical groove 14 is formed in a predetermined range extending upward from the lower end of the upper portion 13a. The lower end of the vertical groove 14 is open downward at the lower end of the upper portion 13a. The upper end of the vertical groove 14 is located in the middle of the upper portion 13a in the vertical direction and is not open upward.

[0027] As shown in Figure 1, the discharge device 1 includes a head portion 30. The head portion 30 comprises a top wall portion 31 and a cylindrical peripheral wall 32, and is supported by the mounting cap 10. In this embodiment, the peripheral wall 32 is cylindrical and coaxial with the peripheral wall portion 11a and the support portion 12. The lower end portion of the peripheral wall 32 is fitted around its entire circumference inside the support portion 12 of the mounting cap 10, thereby supporting the head portion 30 on the support portion 12 of the mounting cap 10. The lower part of the head portion 30 is closed by a top wall portion 11b, and it functions as a tank capable of storing contents flowing in from an inlet 11d provided in the top wall portion 11b in its internal space S. The top wall portion 31 and the peripheral wall 32 of the head portion 30 can be integrally formed from, for example, polyethylene resin or polypropylene resin.

[0028] The head portion 30 may also be configured with a cylindrical portion 33. The cylindrical portion 33 is cylindrical in diameter larger than the peripheral wall 32 and is provided integrally with the peripheral wall 32 on the outside of the lower end portion of the peripheral wall 32 via a flange-like portion 34. The cylindrical portion 33 also has the function of fitting onto the outer circumferential surface of the support portion 12 and holding the support portion 12 through undercut engagement.

[0029] The head portion 30 is provided with an outlet 35. The contents stored in the internal space S of the head portion 30 can flow out to the outside of the head portion 30 through the outlet 35.

[0030] The head portion 30 is provided with a cylindrical mounting portion 36 that communicates with the outlet 35, and a nozzle 40 is attached to the mounting portion 36. The nozzle 40 has a discharge hole 41 that communicates with the outlet 35, and can discharge the contents supplied from the internal space S of the head portion 30 through the outlet 35 to the outside through the discharge hole 41.

[0031] In this embodiment, the nozzle 40 is rotatable about the axis of the mounting portion 36. In the open position shown in Figure 1, the discharge hole 41 communicates with the outlet 35. However, in the closed position, which is reached by rotating 90 degrees about the axis of the mounting portion 36 from the position shown in Figure 1, the discharge hole 41 is closed by the closing projection 42. With this configuration, by closing the nozzle 40 during flow, it is possible to prevent the contents stored in the internal space S from unexpectedly leaking out from the outlet 35 and the discharge hole 41.

[0032] A first check valve 50 is positioned at the outlet 35. In this embodiment, the first check valve 50 has an annular holding portion 51 that is clamped and fixed between a valve retainer 37 attached to the mounting portion 36 and the partition wall portion of the mounting portion 36 where the outlet 35 is provided, a valve body 52 that closes the outlet 35, and multiple (3) elastically deformable legs 53 that connect the holding portion 51 and the valve body 52. ​​The first check valve 50 allows the flow of contents from the internal space S inside the head portion 30 toward the discharge hole 41, but operates to block the flow of contents from the discharge hole 41 toward the internal space S inside the head portion 30.

[0033] Furthermore, a second check valve 60 is positioned at the inlet 11d. In this embodiment, the second check valve 60 has an annular retaining portion 61 fitted and fixed in a recess provided in the top wall portion 11b, a valve body 62 that closes the inlet 11d, and multiple (3) elastically deformable legs 63 that connect the retaining portion 61 and the valve body 62. The second check valve 60 allows the flow of contents from the inside of the container body 3 toward the internal space S inside the head portion 30, but operates to block the flow of contents from the internal space S inside the head portion 30 toward the inside of the container body 3.

[0034] Note that the first check valve 50 and the second check valve 60 may be of other configurations as long as they operate in a manner that provides the above-described functions.

[0035] The head portion 30 is provided with an elastically deformable portion 70. The elastically deformable portion 70 is provided in a region that extends from the back side of the head portion 30, facing away from the nozzle 40, across the axis O of the head portion 30, toward both sides. In this embodiment, the elastically deformable portion 70 extends from the region of the back side of the peripheral wall 32 toward the regions of both sides of the peripheral wall 32, and in the regions of both sides, it extends diagonally upward from the back side toward the nozzle 40.

[0036] The elastically deformable portion 70 is formed to be thinner than other areas of the peripheral wall 32, thereby allowing it to be elastically deformed more easily than other areas of the peripheral wall 32. Alternatively, the elastically deformable portion 70 may be formed from a softer material than the material forming the other areas of the peripheral wall 32, and integrated with the peripheral wall 32 by insert molding such as two-color molding or secondary molding, thereby being formed to be softer than other areas of the peripheral wall 32 and allowing it to be elastically deformed more easily than other areas of the peripheral wall 32.

[0037] The head portion 30 is provided with an elastic deformation portion 70, so that the top wall portion 31 functions as an operating portion. That is, when the top wall portion 31 is pushed downward from the state shown in Figure 1, the elastic deformation portion 70 elastically deforms inward of the peripheral wall 32, as shown in Figure 3, thereby reducing the volume of the internal space S of the head portion 30 and pressurizing it. At this time, the upper part of the top wall portion 31 is pushed downward by the elastic deformation of the elastic deformation portion 70, causing it to bend relative to the part where the elastic deformation portion 70 is not provided. In this way, the head portion 30 functions as a pump because it is provided with an elastic deformation portion 70.

[0038] Furthermore, the elastic deformation portion 70 provided on the head portion 30 is not limited to the shape described above. Any configuration that elastically deforms to reduce the volume of the head portion 30 when the top wall portion 31 is pushed downwards can be adopted, such as a bellows shape.

[0039] As shown in Figure 1, a cylinder member 80 is positioned between the tube holder 13 and the opening 3a. The cylinder member 80 is cylindrical with an axis O, and a locking flange 81 integrally provided at its upper end is supported by the upper end of the opening 3a, thereby holding it inside the opening 3a. Reference numeral 82 denotes a sealing member that seals the space between the locking flange 81 and the upper end of the opening 3a. Between the mounting cap 10 and the opening 3a, an outside air intake passage 83 is provided, which communicates with the inside of the cylinder member 80 from the outside of the mounting cap 10 through a helical groove between the male thread 3c and the female thread 11c and between the locking flange 81 and the top wall portion 11b. The upper end of the cylinder member 80 communicates with the outside via this outside air intake passage 83. On the other hand, an inward-facing flange 84 is integrally provided at the lower end of the cylinder member 80, and the lower end of the cylinder member 80 communicates with the inside of the container body 3 through the gap between the inward-facing flange 84 and the tube holder 13.

[0040] A piston member 90 is positioned inside the cylinder member 80. The piston member 90 is formed in a ring shape and has an inner seal portion 91 and an outer seal portion 92. The piston member 90 is vertically movable between a closed position (shown in Figures 1 and 3) in which the inner seal portion 91 contacts the outer surface of the tube holder 13 over its entire circumference and the outer seal portion 92 contacts the inner surface of the cylinder member 80 over its entire circumference above the vertical groove 14 provided on the outer surface of the tube holder 13, and an open position (shown in Figure 4) in which the inner seal portion 91 contacts the outer surface of the tube holder 13 over its entire circumference and the outer seal portion 92 contacts the inner surface of the cylinder member 80 over its entire circumference in the portion where the vertical groove 14 is provided.

[0041] In this embodiment, the lower inner circumferential surface of the cylinder member 80 has a smaller diameter than the upper inner circumferential surface, and the outer seal portion 92 of the piston member 90 is always in contact with the inner circumferential surface of the lower, smaller-diameter portion of the cylinder member 80. Furthermore, the piston member 90 is integrally provided with a ring-shaped stopper body 93 which is located above the outer seal portion 92 and is in contact with the inner circumferential surface of the upper, larger-diameter portion of the cylinder member 80. The piston member 90 is configured such that the lower stroke end position is restricted to the open position when the stopper body 93 abuts against the upper end of the lower, smaller-diameter portion of the cylinder member 80.

[0042] A leaf spring portion 85 is integrally provided on the cylinder member 80. The leaf spring portion 85 is configured to be elastically deformed when the piston member 90 moves from the closed position to the open position, thereby biasing the piston member 90 toward the closed position.

[0043] In this embodiment, multiple leaf spring portions 85 are provided on the inner circumferential edge of the inward flange 84 of the cylinder member 80, protruding upward from the inner circumferential edge and arranged at intervals in the circumferential direction. Each leaf spring portion 85 is elastically deformable radially outward. On the other hand, the piston member 90 is integrally provided with a tapered surface 94 that gradually decreases in diameter downward, and the upper ends of each leaf spring portion 85 face the tapered surface 94. When the piston member 90 moves from the closed position to the open position, each leaf spring portion 85 is pushed radially outward by the tapered surface 94 and undergoes elastic deformation. When each leaf spring portion 85 undergoes elastic deformation radially outward, its elastic force is applied to the tapered surface 94, thereby biasing the piston member 90 upward, i.e., toward the closed position, by the leaf spring portions 85.

[0044] In the discharge device 1 or discharge container 2 with the above configuration, when the top wall portion 31, which functions as an operating part, is pushed downward, as shown in Figure 3, the elastic deformation portion 70 elastically deforms inward toward the peripheral wall 32, reducing the volume of the internal space S of the head portion 30 and pressurizing it. When the internal space S is pressurized, the first check valve 50 opens while the second check valve 60 is kept closed, and the contents stored in the internal space S are discharged from the outlet 35 through the discharge hole 41 and out of the nozzle 40.

[0045] After the contents are discharged and the downward pressure on the top wall portion 31 is released, the top wall portion 31 and the elastically deformable portion 70 return to their original shape due to the elastic force of the top wall portion 31 and the elastically deformable portion 70, as shown in Figure 4. At this time, the internal space S becomes negative pressure, so the second check valve 60 opens while the first check valve 50 remains closed, and the contents stored inside the container body 3 are filled into the internal space S through the suction tube 20 and the inlet 11d.

[0046] Furthermore, when the contents stored inside the container body 3 fill the internal space S through the suction tube 20 and the inlet 11d, a negative pressure is generated inside the container body 3. As shown in Figure 4, this negative pressure pulls the piston member 90 downward from the closed position to the open position. When the piston member 90 is in the open position, the inner seal portion 91 contacts the outer surface of the tube holder 13 below the upper end of the vertical groove 14. As a result, the inside of the container body 3 is connected to the outside through the vertical groove 14 and the outside air introduction passage 83, and outside air is introduced into the inside of the container body 3, relieving the negative pressure.

[0047] When the negative pressure inside the container body 3 is released, the piston member 90 is pushed by the leaf spring portion 85 and moves from the open position to the upper closed position. As a result, the communication between the vertical groove 14 and the outside air intake passage 83 is blocked by the piston member 90, preventing the contents inside the container body 3 from leaking out to the outside through the vertical groove 14 and the outside air intake passage 83.

[0048] By repeatedly pressing down on the top wall portion 31 and releasing it, the contents inside the container body 3 can be discharged to the outside through the discharge hole 41 of the nozzle 40 without creating negative pressure inside the container body 3.

[0049] Thus, the discharge device 1 to discharge container 2 according to this embodiment can discharge its contents by pressing down on the top wall portion 31 to elastically deform the elastic deformation portion 70. Therefore, the head portion 30 can function as a pump to discharge the contents without using a pump with a cylinder and piston or a metal spring. Accordingly, the discharge device 1 to discharge container 2 according to this embodiment can improve the recyclability of the discharge device 1 to discharge container 2 and can also be used for applications that discharge contents containing solid materials such as abrasives.

[0050] Furthermore, in this embodiment, the dispensing device 1 to the dispensing container 2 is configured such that the nozzle 40 does not move up or down when the top wall portion 31 is pressed down, making it easier to dispense the contents from the nozzle 40 to a desired position.

[0051] Furthermore, the discharge device 1 to discharge container 2 according to this embodiment can reliably introduce outside air into the container body 3 when the contents stored inside the container body 3 are filled into the internal space S through the suction pipe 20 and the inlet 11d, creating a negative pressure inside the container body 3. This prevents the container body 3 from deforming or the contents from becoming difficult to discharge due to the negative pressure inside the container body 3.

[0052] The present invention is not limited to the embodiments described above, and it goes without saying that various modifications are possible without departing from the spirit of the invention.

[0053] For example, in the above embodiment, the peripheral wall 32 of the head portion 30 is cylindrical, but it is not limited to this and may be elliptical or rectangular.

[0054] Furthermore, the shape of the elastically deformable portion 70 is not limited to the above shape; it can be changed in various ways, such as a bellows shape, as long as it can elastically deform when the top wall portion 31 is pushed down, allowing the head portion 30 to function as a pump.

[0055] Furthermore, in the above embodiment, the piston member 90 has a tapered surface 94, but it is not limited to this, and any other shape is acceptable as long as it is pushed by the leaf spring portion 85 and biased from the open position toward the closed position. [Explanation of Symbols]

[0056] 1 Dispenser 2 Discharge container 3. Container body 3a Mouth 3b Torso 3c male screw 10. Mounting cap 11 Cap body 11a Peripheral wall part 11b Ceiling wall part 11c female thread 11d Inlet 12 Support part 13 Tube holder 13a Upper part 13b Lower part 14 Vertical groove 20 Suction tube 30 Head section 31 Top wall 32 Peripheral wall 33 Cylindrical part 34 Flange-shaped portion 35 Outlet 36 Mounting part 37 Valve retainer 40 nozzles 41 Discharge hole 42 Obstruction process 50 First check valve 51 Holding part 52 Valve body 53 Legs 60. Second check valve 61 Holding part 62 valve body 63 Legs 70 Elastic deformation part 80 Cylinder component 81 Locking flange 82 sealing member 83 Outside air intake 84 Inward flange 85 Leaf spring section 90 Piston Member 91 Inner seal section 92 Outer seal section 93 Stopper body 94 Tapered surface O axis S interior space

Claims

1. A mounting cap that is attached to the mouth of the container body, A head portion comprising a top wall and a cylindrical peripheral wall, supported by the mounting cap, A nozzle having a discharge hole that communicates with the outlet provided in the head portion, A first check valve is positioned at the outlet and prevents the flow of contents from the discharge hole toward the interior of the head portion, while allowing the flow of contents from the interior of the head portion toward the discharge hole. A second check valve is provided in the inlet of the mounting cap, which prevents the flow of contents from the inside of the head portion to the inside of the container body and allows the flow of contents from the inside of the container body to the inside of the head portion. An elastic deformation part provided in the head portion, which elastically deforms to reduce the volume of the head portion when the top wall portion is pressed down, thereby allowing the head portion to function as a pump, A tube holder formed in a cylindrical shape with vertical grooves opening downwards on its outer circumferential surface, integrally provided with the mounting cap and connected to the inlet, A cylinder member is positioned between the tube holder and the opening, with its upper end communicating with the outside and its lower end communicating with the inside of the container body via an air intake passage between the mounting cap and the opening. A piston member is formed in a ring shape with an inner sealing portion and an outer sealing portion, and is movable vertically within the cylinder member between a closed position in which the inner sealing portion contacts the outer circumferential surface of the tube holder over its entire circumference above the vertical groove and the outer sealing portion contacts the inner circumferential surface of the cylinder member over its entire circumference, and an open position in which the inner sealing portion contacts the outer circumferential surface of the tube holder over its entire circumference and the outer sealing portion contacts the inner circumferential surface of the cylinder member over its entire circumference in the portion where the vertical groove is provided, The cylinder member is integrally provided with a leaf spring portion which, when the piston member moves to the open position, is pressed by the piston member and elastically deforms, biasing the piston member toward the closed position. A discharge device characterized in that when the top wall portion is pushed down, the elastic deformation portion elastically deforms toward the inside of the peripheral wall, causing the head portion to function as a pump, and when the top wall portion returns to its original position, the piston member moves from the closed position to the open position, allowing outside air to be introduced into the container body.

2. The discharge device according to claim 1, wherein the elastically deformable portion is provided in a region extending from the back side facing the opposite side from the nozzle across the axis of the head portion toward both side sides, and is formed to be thinner than other regions of the peripheral wall, or is formed to be softer than other regions of the peripheral wall by insert molding of a soft material, thereby enabling elastic deformation more easily than other regions of the peripheral wall.

3. The discharge device according to claim 1, wherein the piston member has a tapered surface that gradually decreases in diameter downward, and is configured such that when the piston member moves to the open position, the leaf spring portion is pressed by the tapered surface.

4. A discharge container comprising the container body and the discharge device described in any one of claims 1 to 3.

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