Dispenser

Abstract

To provide a discharger capable of suppressing leakage of a content from a vent hole even when a piston does not return to a rising limit position when rising by an energizing part.SOLUTION: The discharger 2 includes a cylinder portion 5a1 having a vent hole 5a, a piston 6 having a lower seal portion 6b and an upper seal portion 6c, and a holding member 7 having a discharge port 7c1, and when the holding member 7 is pressed down against a biasing force, the opening / closing portion 10 is opened, and then the holding member 7 presses down the piston 6 to discharge the contents 4 from the discharge port 7c1. When the push-down operation is released, the opening / closing portion 10 is closed and the holding member 7 pushes up the piston 6, so that the contents 4 are sucked into the pump chamber 9, the lower seal portion 6b comes into close contact with the inner peripheral surface of the cylinder portion 5a1 below the vent hole 5a at the initial position, and the upper seal portion 6c expands downward and comes into close contact with the inner peripheral surface of the cylinder portion 5a1 above the vent hole 5a at the initial position.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a dispenser. [Background technology]

[0002] a piston having a lower seal and an upper seal, a retaining member, a biasing member, a stopper member attached to the cylinder member to prevent the retaining member from coming out of the cylinder member, an opening / closing member which opens and closes the downstream end of the pump chamber, and an outside air introduction path which introduces outside air into the container body through the vent; when the retaining member is pressed down against the biasing force, the retaining member descends relative to the piston and the opening / closing member opens, and then the retaining member pushes down on the piston, discharging the contents in the pump chamber through the opening / closing member; when the pressing operation is released, the biasing force causes the retaining member to rise relative to the piston, closing the opening / closing member and the retaining member pushing up on the piston, thereby sucking the contents in the container body into the pump chamber; the upper seal of the piston expands upward and comes into close contact with the inner surface of the cylinder member; and the upper end of the upper seal member is located in the gap between the lower end of the stopper member and the inner surface of the cylinder member at its upper limit position (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2022-69928 Summary of the Invention [Problem to be solved by the invention]

[0004] In the dispenser having the above configuration, when the piston is at its upper limit position, even if the pressure inside the container body increases due to changes in the outside air temperature or the action of external forces such as an impact, the upper end of the upper seal part is supported from the radially inner side by the lower end of the retaining member and remains in close contact with the inner circumferential surface of the cylinder part, thereby preventing the contents from leaking from the vent hole through the outside air introduction path. However, if the biasing part wears down (the biasing force decreases) due to long-term storage during distribution, and the piston does not return to its upper limit position when raised by the biasing part, there is a risk that leakage of the contents from the vent hole cannot be prevented.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a dispenser that can prevent leakage of contents from the vent hole even when the piston does not return to its maximum lift position when raised by the biasing portion. [Means for solving the problem]

[0006] One aspect of the present invention is as follows.

[0007] [1] a cylinder portion having a vent hole and attached to the opening of the container body; a piston having a contacted portion, a lower seal portion, and an upper seal portion; a holding member having a contact portion and a discharge port; a biasing portion that applies an upward biasing force to the holding member; a pump chamber defined by the cylinder portion and the piston; an opening / closing portion configured by the contacted portion and the contact portion and configured to open and close the downstream end of the pump chamber; an outside air introduction path that introduces outside air into the container body through the vent hole, When the holding member is pressed down against the biasing force, the holding member descends relative to the piston, and the contact portion separates from the contacted portion, thereby opening the opening / closing portion. Thereafter, the holding member pushes down the piston, causing the content in the pump chamber to pass through the opening / closing portion and be discharged from the discharge port. When the pressing operation is released, the biasing force causes the holding member to rise relative to the piston, and the contact portion comes into contact with the contacted portion, thereby closing the opening / closing portion, and the holding member pushes up the piston, thereby sucking the content in the container body into the pump chamber, the lower seal portion is in close contact with the inner circumferential surface of the cylinder portion below the vent hole when the piston is returned to an initial position by the biasing portion upon release of the pressing operation, The upper seal portion expands in diameter downward and, in the initial position, is in close contact with an inner circumferential surface of the cylinder portion above the vent port.

[0008] [2] a retaining member attached to the cylinder portion, the piston has a cylindrical stopper extending upward from the upper seal portion, The dispenser according to [1], wherein the stopper prevents the retaining member from coming out of the cylinder portion by abutting against a lower end of the retaining member.

[0009] [3] the contact portion of the holding member has a sliding region that allows the contacted portion of the piston to slide over a predetermined width in the up-down direction, The pressing operation causes the contact portion to slide the contacted portion in the sliding region, thereby opening the opening / closing portion; When the pressing operation is released, the biasing force causes the contact portion to come into contact with the contacted portion, thereby closing the opening / closing portion, and then the contact portion slides on the contacted portion in the sliding region, causing the holding member to come into contact with the contacted portion and push up the piston, The cylinder portion has a stepped portion that reduces the inner diameter on the lower side and catches the upper seal portion when the cylinder portion is pressed down, thereby causing the contact portion and the contacted portion to slide. [1] or [2] The dispenser described in [1] or [2]. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a dispenser that can prevent leakage of contents from the ventilation hole even when the piston does not return to the upper limit position when raised by the biasing portion. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 10 is a cross-sectional view showing a state in which a holding member is at a lift limit position in the discharge container of the embodiment of the present invention. [Figure 2] 1. FIG. 4 is a cross-sectional view showing a state in which the piston is in an initial position when the biasing portion has worn out in the discharge container shown in FIG. [Figure 3] FIG. 3 is a partially enlarged view of the discharge container shown in FIG. [Figure 4] 2 is a partially enlarged view showing a state when a pressing operation is started from the state shown in FIG. 1. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0013] As shown in FIG. 1, in one embodiment of the present invention, a dispensing container 1 has a dispenser 2 and a container body 3. The container body 3 has a mouth 3a, a body 3b, and a bottom (not shown) connected in this order, and contains a content 4. In this embodiment, the content 4 is a liquid. In this embodiment, the direction along the central axis O is referred to as the up-down direction, the direction from the bottom of the container body 3 toward the mouth 3a is referred to as the upward direction, and the opposite direction is referred to as the downward direction. A direction perpendicular to the central axis O is referred to as the radial direction, and a direction going around the central axis O is referred to as the circumferential direction.

[0014] The dispenser 2 has a cylindrical cylinder portion 5a having a vent 5a1 and centered on a central axis O, which is attached to the opening 3a of the container body 3; a piston 6 made of a resin material and having a contacted portion 6a1, a lower seal portion 6b, and an upper seal portion 6c; a holding member 7 having a contact portion 7b5 and a discharge port 7c1; an urging portion 8 formed of a resin spring that applies an upward urging force to the holding member 7; a pump chamber 9 defined by the cylinder portion 5a and the piston 6; an opening / closing portion 10 formed by the contacted portion 6a1 and the contact portion 7b5 and that opens and closes the downstream end of the pump chamber 9; and an outside air introduction path 11 that introduces outside air into the container body 3 through the vent 5a1. When the holding member 7 is pressed down against the urging force, the holding member 7 descends relative to the piston 6, and the contact portion 7b5 moves in a direction perpendicular to the axial direction of the piston 6. a1, the opening / closing portion 10 opens, and then the retaining member 7 pushes down on the piston 6, causing the contents 4 in the pump chamber 9 to be discharged through the opening / closing portion 10 and out of the discharge port 7c1. When the pressing operation is released, the biasing force causes the retaining member 7 to rise relative to the piston 6, causing the contact portion 7b5 to come into contact with the contacted portion 6a1, thereby closing the opening / closing portion 10, and the retaining member 7 pushes up on the piston 6, causing the contents 4 in the container body 3 to be sucked into the pump chamber 9. When the pressing operation is released and the piston 6 is returned by the biasing portion 8, the lower seal portion 6b is in close contact with the inner surface of the cylinder portion 5a below the vent port 5a1 in its initial position, and the upper seal portion 6c expands in diameter downwards and is in close contact with the inner surface of the cylinder portion 5a above the vent port 5a1 in its initial position.

[0015] According to this embodiment, because the upper seal portion 6c is configured to expand in diameter downward, even if the pressure inside the container body 3 increases when the piston 6 is in the initial position, the pressure acts radially outward on the upper seal portion 6c, which is in close contact with the inner circumferential surface of the cylinder portion 5a above the vent opening 5a1. This does not prevent the upper seal portion 6c from being tightly fitted to the cylinder portion 5a. Therefore, as shown in FIGS. 2 and 3 , even if the biasing portion 8 wears out and the piston 6 is unable to return to its maximum lift position when it is lifted by the biasing portion 8, leakage of the contents 4 from the vent opening 5a1 through the outside air introduction path 11 can be prevented. Furthermore, when the piston 6 is lifted by releasing the pressing operation, the upper seal portion 6c is configured to expand in diameter downward, thereby reducing the sliding resistance between the upper seal portion 6c and the cylinder portion 5a, thereby facilitating the lift of the piston 6.

[0016] 1, the dispenser 2 has a retaining member 12 attached to the cylinder portion 5a, and the piston 6 has a cylindrical stopper 6d extending upward from the upper seal portion 6c, which prevents the retaining member 7 from coming out of the cylinder portion 5a by abutting against the lower end of the retaining member 12. According to the above configuration, the stopper 6d increases the rigidity of the upper seal portion 6c, further suppressing leakage of the contents 4 from the ventilation opening 5a1.

[0017] The contact portion 7b5 of the retaining member 7 has a sliding area that allows the contacted portion 6a1 of the piston 6 to slide up and down over a predetermined width, and when pressed down, the contact portion 7b5 slides the contacted portion 6a1 in the sliding area, opening the opening / closing portion 10, and when the pressing operation is released, the contact portion 7b5 comes into contact with the contacted portion 6a1 due to the urging force, closing the opening / closing portion 10, and then the contact portion 7b5 slides the contacted portion 6a1 in the sliding area, causing the retaining member 7 to abut against the contacted portion 6a1 and push up the piston 6, and as shown in Figure 4, the cylinder portion 5a has a stepped portion 5a2 that reduces the lower inner diameter and allows the contacted portion 7b5 to slide against the contacted portion 6a1 when pressed down, as the upper seal portion 6c gets caught on it. According to the above configuration, the contact portion 7b5 has a sliding region. Therefore, even if the biasing portion 8 wears out and the piston 6 is unable to return to the upper limit position, an external force such as an impact can cause the piston 6 to rise relative to the holding member 7, opening the opening-closing portion 10 and preventing the contents 4 in the pump chamber 9 from leaking through the opening-closing portion 10. Furthermore, when the piston 6 is pressed down from the initial state, the upper seal portion 6c of the piston 6 engages with the stepped portion 5a2, which allows the contact portion 7b5 to slide the contacted portion 6a1 in the sliding region, thereby facilitating the opening of the opening-closing portion 10. Furthermore, since the upper seal portion 6c of this embodiment is configured to expand downward as described above, it easily engages with the stepped portion 5a2, thereby facilitating the opening of the opening-closing portion 10. In this embodiment, the contact portion 7b5 is provided radially outward of the contacted portion 6a1. However, the contact portion 7b5 may be provided radially inward of the contacted portion 6a1.

[0018] As shown in FIG. 1, the retaining member 7 includes a cylindrical stem 7a that passes vertically through the retaining member 12, a piston guide 7b that is attached to the inner circumferential surface of the stem 7a and has a contact portion 7b5, and a push-down head 7c that has a discharge port 7c1 and is attached to the upper end of the stem 7a and is pressed down. The biasing portion 8 is formed by a compression spring that expands and contracts vertically and is disposed between the push-down head 7c and the retaining member 12. Note that the biasing portion 8 may be formed by a spring other than a compression spring. The biasing portion 8 is not limited to the above-described arrangement, and may be disposed, for example, within the pump chamber 9.

[0019] The piston 6 has an annular shape centered on the central axis O. The upper seal portion 6c has a truncated conical surface. Like the upper seal portion 6c, the lower seal portion 6b also has a truncated conical surface that expands in diameter downward. The piston 6 has a base portion 6e that has an annular shape that is circular in top view and extends radially inward from the upper end of the upper seal portion 6c, a contacted seal portion 6a that extends downward from the inner peripheral edge of the base portion 6e and has a contacted portion 6a1, and a sliding seal portion 6f that extends upward from the inner peripheral edge of the base portion 6e and slides in close contact with the retaining member 7 in the vertical direction. The piston guide 7b has a bottomed, cylindrical portion 7b1 having an opening 7b4 for allowing the contents 4 to pass radially therethrough. The cylindrical portion 7b1 is fitted to the inner circumferential surface of the stem 7a. The skirt portion 7b2 extends downward and radially outward from the lower end of the cylindrical portion 7b1 around the entire circumference. The vertical cylindrical portion 7b3 extends upward from the outer circumferential edge of the skirt portion 7b2. In this embodiment, the contacted portion 6a1 is formed on the outer circumferential surface of the contact-sealed portion 6a, and the contact portion 7b5 is formed on the inner circumferential surface of the vertical cylindrical portion 7b3. However, this is not limited thereto. The contacted portion 6a1 may be formed on the inner circumferential surface of the contact-sealed portion 6a, and the contact portion 7b5 may be formed on the outer circumferential surface of the skirt portion 7b2. In this embodiment, the sliding seal portion 6f slides on the inner circumferential surface of the lower end of the stem 7a. However, this is not limited thereto. The sliding seal portion 6f may slide on the outer circumferential surface of the piston guide 7b.

[0020] The dispenser 2 includes a cylinder member 5 having a cylinder portion 5a and a flange 5b extending radially outward from the upper end of the cylinder portion 5a, and an attachment cap 13 having a flange presser portion 13a and an attachment tubular portion 13b connected to the flange presser portion 13a and attached to the mouth portion 3a, sandwiching the flange 5b between the flange presser portion 13a and the upper end surface of the mouth portion 3a. The retaining member 12 includes a tubular body 12a extending along the inner circumferential surface of the cylinder portion 5a, a protruding portion 12b protruding radially outward from the upper end of the tubular body 12a and contacting the upper surface of the flange 5b, and a receiving portion 12c extending radially inward from the tubular body 12a and supporting the lower end of the biasing portion 8. The lower end of the tubular body 12a prevents the retaining member 7 from coming out of the cylinder portion 5a when a stopper 6d of the piston 6 abuts against the lower end of the tubular body 12a. When the upper seal portion 6c of the piston 6 is below the vent port 5a1, the outside air introduction path 11 introduces outside air through the gap between the inner circumferential surface of the retaining member 12 and the outer circumferential surface of the stem 7a and then through the vent port 5a1 into the container body 3. The cylinder member 5 has an inlet port 5c at the lower end of the cylinder portion 5a, which forms the upstream end of the pump chamber 9, and the discharger 2 has an inlet valve 14 disposed at the inlet port 5c. The inlet valve 14 closes the inlet port 5c when pressed down and opens the inlet port 5c when the pressing operation is released. Note that the inlet valve 14 is not limited to an elastic valve as shown in the figure.

[0021] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and the above-described embodiments can be modified in various ways without departing from the gist of the present invention. [Explanation of symbols]

[0022] 1 Discharge container 2 Dispenser 3 Container body 3a Mouth 3b Torso 4 Contents 5 Cylinder parts 5a Cylinder section 5a1 Ventilation hole 5a2 Step 5b flange 5c Intake port 6 pistons 6a Contacted seal part 6a1 Contacted part 6b Lower seal 6c Upper seal 6d Stopper 6e base 6f Sliding seal part 7 Retaining member 7a stem 7b Piston guide 7b1 Cylindrical part 7b2 Skirt Club 7b3 Vertical cylinder part 7b4 opening 7b5 Contact part 7c Depressor head 7c1 Discharge port 8. Actuating part 9 Pump Room 10 Opening and Closing Section 11 Outside air intake route 12. Anti-slip member 12a cylinder 12b Projection 12c Receptacle 13 Mounting cap 13a Flange holder 13b Mounting tube 14 Suction valve O center axis

Claims

1. a cylinder portion having a vent hole and attached to the opening of the container body; a piston having a contacted portion, a lower seal portion, and an upper seal portion; a holding member having a contact portion and a discharge port; a biasing portion that applies an upward biasing force to the holding member; a pump chamber defined by the cylinder portion and the piston; an opening / closing portion configured by the contacted portion and the contact portion and configured to open and close the downstream end of the pump chamber; an outside air introduction path that introduces outside air into the container body through the vent hole, When the holding member is pressed down against the biasing force, the holding member descends relative to the piston, and the contact portion separates from the contacted portion, thereby opening the opening / closing portion. Thereafter, the holding member pushes down the piston, causing the content in the pump chamber to pass through the opening / closing portion and be discharged from the discharge port. When the pressing operation is released, the biasing force causes the holding member to rise relative to the piston, and the contact portion comes into contact with the contacted portion, thereby closing the opening / closing portion, and the holding member pushes up the piston, thereby sucking the content in the container body into the pump chamber, the lower seal portion is in close contact with the inner circumferential surface of the cylinder portion below the vent hole when the piston is returned to an initial position by the biasing portion upon release of the pressing operation, The upper seal portion expands in diameter downward and, in the initial position, is in close contact with an inner circumferential surface of the cylinder portion above the vent port.

2. a retaining member attached to the cylinder portion, the piston has a cylindrical stopper extending upward from the upper seal portion, The dispenser according to claim 1 , wherein the stopper prevents the holding member from coming out of the cylinder portion by abutting against a lower end of the retaining member.

3. the contact portion of the holding member has a sliding region that allows the contacted portion of the piston to slide over a predetermined width in the up-down direction, The pressing operation causes the contact portion to slide the contacted portion in the sliding region, thereby opening the opening / closing portion; When the pressing operation is released, the biasing force causes the contact portion to come into contact with the contacted portion, thereby closing the opening / closing portion, and then the contact portion slides on the contacted portion in the sliding region, causing the holding member to come into contact with the contacted portion and push up the piston, The dispenser according to claim 1 , wherein the cylinder portion has a stepped portion that reduces the inner diameter on the lower side and catches the upper seal portion when the cylinder portion is pressed down, thereby causing the contact portion and the contacted portion to slide.

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