Discharge container

Abstract

To ensure sealing performance between a contact part of a piston guide and a lower end part of a closing part of a piston even when an energizing member is made of a synthetic resin material.SOLUTION: A discharge container comprises: a stem 11; a piston 13; a piston guide 14; a cylinder 15; and a synthetic resin energizing member 17. The piston has: a cylindrical blocking part 52 fitted on the piston guide so as to be movable up and down relative to the piston guide; and a cylindrical sliding part 51 fitted into the cylinder so as to be able to slide up and down. The piston guide has an abutment part 24 blocking communication between the inside of the stem and a storage space A by abutting the lower end part of the blocking part from below, a support tube 19 is fitted into the cylinder so as to abut against the upper end part of the sliding part from above, and either the abutment part or the lower end part of the blocking part is made of a softer material than the other, and abuts against the other in an elastically deformed state.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] BACKGROUND ART Conventionally, as shown in Patent Document 1 below, for example, there has been known a dispenser comprising: a stem arranged so as to be able to move downward in an upwardly biased state; a cylindrical piston linked to the up and down movement of the stem; a piston guide protruding downward from the stem and penetrating the inside of the piston in the vertical direction; a cylinder in which the piston is housed so as to be able to slide up and down, and the portion located below the piston guide is used as a storage space for the content liquid; and a biasing member made of a synthetic resin material and supporting the stem so as to be able to move downward in an upwardly biased state, wherein the piston is provided with a cylindrical closing portion exteriorly mounted so as to be able to move up and down relative to the piston guide, and a cylindrical sliding portion fitted into the cylinder so as to be able to slide up and down, and the piston guide is provided with an abutment portion that abuts against the lower end of the closing portion from below, thereby blocking communication between the inside of the stem and the storage space, and a support cylinder is fitted into the cylinder so as to abut against the upper end of the sliding portion from above the sliding portion. In this dispenser, when the piston guide descends as the stem is pressed down, the abutment portion of the piston guide moves downward away from the lower end of the closing portion of the piston, creating a vertical gap between the abutment portion and the lower end of the closing portion, and this gap connects the storage space of the cylinder to the inside of the stem. Subsequently, when the stem is further lowered, the biasing member undergoes vertical compression deformation while the stem presses down the piston, increasing the internal pressure of the storage space, and the liquid in the storage space flows into the stem through the gap and rises inside the stem. When the stem is released from the depressed state, the upward biasing force of the biasing member causes the stem to rise together with the piston guide, and the abutting portion of the piston guide abuts against the lower end of the closing portion of the piston, causing the piston to rise with communication between the storage space and the inside of the stem blocked. This creates a negative pressure in the storage space, causing the content liquid in the container body to flow into the storage space. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-069928 Summary of the Invention [Problem to be solved by the invention]

[0004] However, synthetic resin biasing members tend to develop vertical compressive deformation during repeated use of the dispenser. For example, this tendency becomes more pronounced when the dispenser is used over a long period of time due to frequent refilling of the liquid content and replacement of the dispenser. With a biasing member that has developed vertical compressive deformation, the stem, piston guide, and piston may not return to their uppermost positions when the stem is released. In this case, it becomes difficult to ensure a seal between the abutting portion of the piston guide and the lower end of the closing portion of the piston during standby before the stem is pressed down.

[0005] One of the objects of the present invention is to provide a dispenser that can ensure sealing between the abutment portion of the piston guide and the lower end of the closing portion of the piston even when the urging member is made of a synthetic resin material. [Means for solving the problem]

[0006] A dispenser according to one aspect of the present invention includes a stem that is provided so as to be movable downward in an upward biased state, a cylindrical piston that is linked to the up and down movement of the stem, a piston guide that protrudes downward from the stem and penetrates the inside of the piston in the up and down direction, a cylinder in which the piston is housed so as to be slidable up and down, and a portion located below the piston guide is used as a storage space for the liquid content, and an biasing member that is made of a synthetic resin material and supports the stem so as to be movable downward in an upward biased state, and the piston has a biasing member that is capable of moving up and down relative to the piston guide. The piston guide is provided with a cylindrical blocking portion that is movably exteriorized, and a cylindrical sliding portion that is fitted into the cylinder so that it can slide up and down, and the piston guide is provided with an abutment portion that abuts against the lower end of the blocking portion from below the blocking portion, thereby blocking communication between the inside of the stem and the storage space, and a support tube is fitted into the cylinder that abuts against the upper end of the sliding portion from above the sliding portion, and either the abutment portion or the lower end of the blocking portion is made of a softer material than the other, and abuts against the other in an elastically deformed state.

[0007] The support cylinder abuts against the upper end of the sliding contact portion of the piston from above the sliding contact portion, and either the abutment portion of the piston guide or the lower end of the closing portion of the piston is made of a softer material than the other and abuts against the other in an elastically deformed state. Therefore, even if the synthetic resin biasing member becomes accustomed to vertical compressive deformation during repeated use of the dispenser, and the stem, piston guide, and piston no longer return to their uppermost positions when the stem is released, by restoring and deforming either the abutment portion or the lower end of the closing portion, it is possible to maintain the close abutment state between the abutment portion and the lower end of the closing portion, just as before the biasing member became accustomed to vertical compressive deformation, and it is possible to ensure a seal between the abutment portion and the lower end of the closing portion.

[0008] The biasing member may be formed in a cylindrical shape extending in the vertical direction and surround the stem from the outside in the radial direction.

[0009] Since the cylindrical urging member surrounds the stem from the outside in the radial direction, it is possible to prevent the content liquid from coming into contact with the synthetic resin urging member, and it is possible to make the urging member less likely to develop a tendency to compress and deform in the vertical direction during repeated use of the dispenser.

[0010] The cylinder may have an inner peripheral surface formed with a step portion over which a lower end portion of the sliding contact portion moves upward when the piston, which is positioned at a lowermost position, moves upward to return to its original position.

[0011] A step is formed on the inner surface of the cylinder, which the lower end of the sliding contact portion moves over when the piston, which is positioned at the lowest end position, moves back upward.As the stem and piston guide move back upward, the abutting portion of the piston guide abuts against the lower end of the closing portion of the piston, and the lower end of the sliding contact portion moves over the step.At this time, the abutting portion can be made to abut firmly against the lower end of the closing portion, thereby improving the sealing performance between the abutting portion and the lower end of the closing portion. [Effects of the Invention]

[0012] According to one aspect of the present invention, even if the biasing member is made of a synthetic resin material, it is possible to ensure sealing between the contact portion of the piston guide and the lower end of the closing portion of the piston. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a vertical cross-sectional view of a dispenser shown as a first embodiment. [Figure 2] 2 is an enlarged view of a portion of the dispenser of FIG. 1, showing the stem, piston guide, and piston in the middle of ascending from their lowest positions. FIG. [Figure 3] FIG. 10 is a vertical cross-sectional view of a dispenser shown as a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, a dispenser according to a first embodiment will be described with reference to the drawings. 1, the dispenser 1 according to this embodiment includes a stem 11, a dispenser head 12, a piston 13, a piston guide 14, a cylinder 15, a biasing member 17, and a support tube 19. Each of these components 11, 12, 13, 14, 15, 17, and 19 is made of the same material, such as polypropylene, except for the soft material portions described below. The stem 11, piston 13, piston guide 14, cylinder 15, and support tube 19 are arranged with their respective central axes positioned on a common axis.

[0015] Hereinafter, this common axis will be referred to as the central axis O, and the direction along the central axis O will be referred to as the vertical direction. The direction intersecting the central axis O when viewed from the vertical direction will be referred to as the radial direction, and the direction going around the central axis O when viewed from the vertical direction will be referred to as the circumferential direction.

[0016] The dispenser 1 is attached to a container body W containing the liquid content via an attachment cap 16. The attachment cap 16 is formed in the shape of a topped cylinder with an annular top wall. An outer cylinder 16a extending upward is formed on the upper surface of the top wall. A female thread portion is formed on the inner peripheral surface of the attachment cap 16, which screws into a male thread portion formed on the outer peripheral surface of the mouth of the container body W. The attachment cap 16 is disposed coaxially with the central axis O.

[0017] The stem 11 is provided so as to be movable downward while being biased upward. The lower part of the stem 11 is inserted into the cylinder 15, and the upper part protrudes upward from the cylinder 15. The inner and outer diameters of the lower end 11a of the stem 11 are larger than the inner and outer diameters of the portion of the stem 11 located above the lower end 11a.

[0018] The ejection head 12 includes a head main body 12a, a mounting tube portion 12b, a nozzle tube portion 12c, and a rib 12e. The head body 12a is formed in a cylindrical shape with a top. The mounting tube 12b extends downward from the top wall of the head body 12a. The head body 12a and the mounting tube 12b are arranged coaxially with the central axis O. The mounting tube 12b is attached to the upper end of the stem 11. In the illustrated example, the mounting tube 12b is fitted into the stem 11. The nozzle tube portion 12c extends radially outward from the mounting tube portion 12b and protrudes radially outward from the head body 12a. The interior of the nozzle tube portion 12c is in communication with the interior of the mounting tube portion 12b. The tip opening of the nozzle tube portion 12c serves as a discharge hole 12d through which the content liquid is discharged. The rib 12e is formed in a plate shape with its front and back surfaces facing the circumferential direction, and connects the lower surface of the top wall of the head main body 12a, the inner circumferential surface of the circumferential wall of the head main body 12a, and the outer circumferential surface of the mounting tube portion 12b. A plurality of ribs 12e are provided at intervals in the circumferential direction. The lower end surfaces of the ribs 12e are located at the same vertical position as the lower end of the outer circumferential surface of the nozzle tube portion 12c.

[0019] The piston 13 is housed in a cylinder 15 so as to be able to slide up and down. The piston 13 is formed in a cylindrical shape and is linked to the up and down movement of the stem 11. The piston 13 includes a cylindrical sliding portion 51, a cylindrical closing portion 52, and an annular connecting portion 53. The sliding portion 51, the closing portion 52, and the annular connecting portion 53 are each disposed coaxially with the central axis O. In the illustrated example, the sliding portion 51, the closing portion 52, and the annular connecting portion 53 are integrally formed.

[0020] The sliding contact portion 51 is fitted into the cylinder 15 so as to be vertically slidable. The closing portion 52 is mounted on the exterior of the piston guide 14 so as to be movable up and down relatively to the piston guide 14. The closing portion 52 is disposed on the inner side of the sliding contact portion 51 in the radial direction. The annular connecting portion 53 radially connects the sliding contact portion 51 and the blocking portion 52. The annular connecting portion 53 radially connects the sliding contact portion 51 and the blocking portion 52 at their respective middle portions in the up-down direction.

[0021] The outer peripheral surface of the sliding contact portion 51 extends radially outward as it moves away from the annular connecting portion 53 in the vertical direction. Both ends of the outer peripheral surface of the sliding contact portion 51 in the vertical direction are in continuous contact with the inner peripheral surface of the cylinder 15 over the entire circumference. The blocking portion 52 includes an upper cylindrical portion 52a and a lower cylindrical portion 52b. The upper cylindrical portion 52a protrudes upward from the annular connecting portion 53. An upper portion of the upper cylindrical portion 52a, which is located within the stem 11, extends radially outward from the bottom to the top. The upper end of the upper cylindrical portion 52a is tightly fitted into the stem 11 so as to be slidable up and down. The inner peripheral surface of the upper cylindrical portion 52a is spaced radially outward from the outer peripheral surface of the piston guide 14. The lower cylindrical portion 52b protrudes downward from the annular connecting portion 53. The inner peripheral surface of the lower cylindrical portion 52b is spaced radially outward from the outer peripheral surface of the piston guide 14 and extends in the vertical direction. The outer peripheral surface of the lower cylindrical portion 52b extends radially outward from the bottom to the top. The lower end of the lower cylindrical portion 52b is located above the lower end of the sliding contact portion 51. The upper surface of the annular connecting portion 53 is spaced downward from and faces in the vertical direction relative to the lower end opening edge of the stem 11. The lower end opening edge of the stem 11 abuts against the upper surface of the annular connecting portion 53 when the stem 11 moves downward.

[0022] The piston guide 14 is formed in a cylindrical shape with a bottom, protrudes downward from the stem 11, and penetrates the inside of the piston 13 in the vertical direction. The upper part of the piston guide 14 is fitted into a part of the lower part of the stem 11 that is located above the enlarged lower end part 11a. A cylindrical, closed-topped protrusion 14a having an annular top wall protruding radially outward is formed at the lower end of the piston guide 14. A communicating hole 14b that passes radially through the piston guide 14 is formed in the piston guide 14 above the protrusion 14a and below the upper part that fits inside the stem 11. A plurality of communicating holes 14b are provided at intervals in the circumferential direction.

[0023] A recess 21 that opens upward and radially outward is formed on the outer peripheral edge of the upper surface of the top wall of the protruding portion 14a. The recess 21 extends continuously over the entire circumferential length. The lower end of the sliding contact portion 51 of the piston 13 is inserted into the recess 21. Of the inner surfaces that define the recess 21, the surface that faces radially outward is spaced radially inward from the sliding contact portion 51. Of the inner surfaces that define the recess 21, the surface that faces upward is spaced downward from the sliding contact portion 51. 2, an annular protrusion 28 protruding upward is formed on the upper surface of the top wall of the protruding portion 14a around the opening periphery of the recess 21. The annular protrusion 28 extends continuously over the entire circumferential length. The inner peripheral surface of the annular protrusion 28 is curved radially inward. The outer peripheral surface of the peripheral wall of the protruding portion 14a abuts against or is close to the inner peripheral surface of the cylinder 15. A communicating vertical groove 25 is formed in the outer peripheral surface of the peripheral wall of the protruding portion 14a over the entire length in the vertical direction.

[0024] The piston guide 14 is provided with an abutment portion 24 that abuts against the lower end of the lower cylindrical portion 52b (closure portion 52) of the piston 13 from below the lower cylindrical portion 52b, thereby blocking communication between the inside of the stem 11 and the accommodation space A. The abutment portion 24 is a portion of the upper surface of the top wall of the protruding portion 14a that is located radially inward from the recessed portion 21.

[0025] The portion of the cylinder 15 located below the piston guide 14 serves as a storage space A in which the liquid content in the container body W is temporarily stored. As shown in FIG. 1, a flange portion 15a that protrudes radially outward is formed at the upper end of the cylinder 15. The flange portion 15a is fixed by undercut fitting within the upper end of the attachment cap 16. A connecting tube 15b that extends downward is provided at the lower end of the cylinder 15. The connecting tube 15b extends downward from the peripheral edge of the lower end opening on the outer surface of the cylinder 15. A suction pipe P is fitted into the connecting tube 15b. The lower end of the suction pipe P is located within the bottom of the container body W.

[0026] A lower valve body 18 is disposed within the cylinder 15. The lower valve body 18 is provided within the lower end portion of the cylinder 15. Lower valve body 18 serves as a check valve that keeps the lower end opening on the inner surface of cylinder 15 closed when the inside of cylinder 15 is pressurized, and opens the lower end opening on the inner surface of cylinder 15 when the inside of cylinder 15 is depressurized. Lower valve body 18 prevents the liquid content in cylinder 15 from returning to container body W through the lower end opening on the inner surface of cylinder 15 when the inside of cylinder 15 is pressurized, but allows the liquid content in container body W to flow into cylinder 15 through the lower end opening on the inner surface of cylinder 15 when the inside of cylinder 15 is depressurized.

[0027] The lower valve body 18 includes a mounting portion 31 , a valve body 32 , and a connecting piece 33 . The mounting part 31 is fitted and fixed within the lower end of the cylinder 15. The valve body 32 is formed in a plate shape and is seated on the periphery of the lower end opening on the inner surface of the cylinder 15, blocking communication between the inside of the cylinder 15 and the inside of the container body W. The outer peripheral surface of the valve body 32 is connected to the mounting part 31 via an elastically deformable connecting piece 33. The valve body 32 elastically displaces in the vertical direction as the connecting piece 33 elastically deforms.

[0028] A step 22 is formed on the inner peripheral surface of the cylinder 15, over which the lower end of the sliding contact portion 51 of the piston 13 moves when the piston 13, which is located at the lowest position, moves upward to its original position. The step 22 is a circumferential groove that is recessed radially outward and extends continuously in the circumferential direction. When the piston 13 is located at the lowest position, the lower end of the sliding contact portion 51 enters the step 22. As shown in FIG. 2 , when the piston 13 moves upward to its original position, the lower end of the sliding contact portion 51 moves upward over the surface of the inner surface of the step 22 that is located at the upper end and faces downward.

[0029] A support tube 19 is fitted into the cylinder 15 and abuts against the upper end of the sliding contact portion 51 of the piston 13 from above the sliding contact portion 51. The upper opening edge of the sliding contact portion 51 abuts closely against the lower opening edge of the support tube 19. The lower opening edge of the support tube 19 extends upward as it moves radially outward. The stem 11 is inserted into the support cylinder 19 so as to be movable up and down. The lower end of the support cylinder 19 surrounds the lower end 11a of the stem 11 from the outside in the radial direction.

[0030] The support tube 19 is formed with a receiving portion 23 that protrudes radially inward and supports the lower end of the urging member 17. The receiving portion 23 is located above the lower end of the support tube 19. The receiving portion 23 includes an annular bottom wall 23a that protrudes radially inward from the inner peripheral surface of the support tube 19 and extends circumferentially, and a peripheral wall 23b that extends upward from the inner peripheral edge of the bottom wall 23a. The inner peripheral surface of the peripheral wall 23b abuts against or is close to the outer peripheral surface of a portion of the stem 11 that is located above the lower end 11a.

[0031] The biasing member 17 is made of a synthetic resin material and supports the stem 11 so that it can move downward while biasing it upward. The biasing member 17 is formed in a cylindrical shape that extends in the vertical direction and is disposed coaxially with the central axis O. The biasing member 17 surrounds the portion of the stem 11 that is located above the lower end 11a from the outside in the radial direction. The lower end of the urging member 17 is inserted between the outer peripheral surface of the peripheral wall 23b of the receiving portion 23 and the inner peripheral surface of the support cylinder 19. The lower end opening edge of the urging member 17 abuts against the upper surface of the bottom wall 23a of the receiving portion 23. The upper end of the urging member 17 is supported by the discharge head 12. The upper end of the urging member 17 is inserted between the inner peripheral surface of the peripheral wall of the head main body 12a and the outer peripheral surface of the stem 11. The upper opening edge of the urging member 17 abuts against the lower end surface of the rib 12e and the lower end of the outer peripheral surface of the nozzle tube portion 12c.

[0032] In this embodiment, either the contact portion 24 of the piston guide 14 or the lower end portion of the lower cylindrical portion 52b (closure portion 52) of the piston 13 is made of a softer material than the other, and contacts the other in an elastically deformed state. Examples of the soft material include elastomer. In the illustrated example, the abutment portion 24 is formed of a soft material. Of the outer peripheral surface of the piston guide 14, a portion located below the upper end and extending upward from the protruding portion 14a, the upper surface of the top wall of the protruding portion 14a, and the outer peripheral surface of the peripheral wall of the protruding portion 14a are integrally formed of a soft material. The recess 21, the communicating vertical groove 25, and the annular protrusion 28 of the piston guide 14 are formed in a portion made of a soft material. Note that only the abutment portion 24 of the piston guide 14 may be formed of a soft material.

[0033] Next, a method of using the dispenser 1 configured as described above will be described.

[0034] When the discharge head 12 is pressed down, the biasing member 17 is compressed in the vertical direction, causing the stem 11 and piston guide 14 to move downward, and the abutting portion 24 of the piston guide 14 moves downward away from the lower cylindrical portion 52b of the piston 13, so that the storage space A of the cylinder 15 and the inside of the stem 11 communicate with each other through the communicating vertical groove 25 and the communicating hole 14b. At this time, the lower end opening edge of the stem 11 abuts against the upper surface of the annular connecting portion 53 of the piston 13, so that if the discharge head 12 is continued to be pressed down, the piston 13 also moves downward together with the stem 11 and piston guide 14. This increases the internal pressure of the storage space A, and the content liquid in the storage space A is supplied into the stem 11 through the communicating vertical groove 25, the gap between the piston guide 14 and the piston 13, and the communicating hole 14b, and is then discharged from the discharge hole 12d. When the piston 13 reaches its lowest position, the lower end of the sliding contact portion 51 of the piston 13 enters the step 22 formed on the inner circumferential surface of the cylinder 15. During the above process, the lower valve body 18 keeps the lower end opening on the inner surface of the cylinder 15 closed.

[0035] Thereafter, when the ejection head 12 is released from the depressed position, the stem 11 and piston guide 14 move upward due to the restoring deformation of the biasing member 17, and the abutment portion 24 of the piston guide 14 abuts against the lower cylindrical portion 52b of the piston 13, blocking communication between the storage space A of the cylinder 15 and the inside of the stem 11. The edge of the lower opening of the stem 11 moves upward away from the annular connecting portion 53 of the piston 13. In this state, when the stem 11 and piston guide 14 continue to move upward due to the restoring deformation of the biasing member 17, the lower cylindrical portion 52b of the piston 13 is pushed up against the abutment portion 24 of the piston guide 14, and the piston 13 also moves upward, creating a negative pressure in the storage space A. As a result, the valve body 32 of the lower valve element 18 moves upward away from the peripheral edge of the lower opening on the inner surface of the cylinder 15, and the content liquid in the container body W is supplied to the storage space A. Here, when the piston 13 moves upward to its original position, the lower end of the sliding portion 51 located within the step portion 22 moves upward over the surface of the inner surface of the step portion 22 that is located at the upper end and faces downward, thereby preventing the upward movement of the piston 13 and causing the abutment portion 24 of the piston guide 14 to abut firmly against the lower cylindrical portion 52b of the piston 13.

[0036] As described above, in the discharge device 1 according to this embodiment, the support tube 19 abuts against the upper end of the sliding contact portion 51 of the piston 13 from above the sliding contact portion 51, and either the abutment portion 24 of the piston guide 14 or the lower end of the lower tube portion 52b of the piston 13 is formed of a softer material than the other and abuts against the other in an elastically deformed state. Therefore, even if the synthetic resin spring member 17 develops a tendency to compress and deform in the vertical direction during repeated use of the dispenser 1, and the stem 11, piston guide 14, and piston 13 no longer return to their uppermost position when the stem 11 is released from being pressed, by restoring and deforming either the abutment portion 24 or the lower cylinder portion 52b, it is possible to maintain the close abutment state between the abutment portion 24 and the lower cylinder portion 52b, just as it was before the abutment portion 17 developed a tendency to compress and deform in the vertical direction, and the sealing between the abutment portion 24 and the lower cylinder portion 52b can be ensured.

[0037] The cylindrical urging member 17 surrounds the stem 11 from the outside in the radial direction, so that it is possible to prevent the content liquid from coming into contact with the synthetic resin urging member 17, and it is possible to make the urging member 17 less likely to develop a tendency to compress and deform in the vertical direction during repeated use of the dispenser 1.

[0038] A step portion 22 is formed on the inner surface of the cylinder 15, which the lower end portion of the sliding portion 51 moves over when the piston 13, which is positioned at the lowest end position, moves back upward.As the stem 11 and piston guide 14 move back upward, the abutment portion 24 of the piston guide 14 abuts against the lower cylindrical portion 52b of the piston 13, and the lower end portion of the sliding portion 51 moves over the step portion 22.At this time, the abutment portion 24 can be made to abut firmly against the lower cylindrical portion 52b, thereby improving the sealing performance between the abutment portion 24 and the lower cylindrical portion 52b.

[0039] Next, a dispenser 2 according to a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted, with only the differences being described.

[0040] In the dispenser 2 of this embodiment, the entire piston guide 14 is made of the same material as the other components such as the stem 11, and the entire lower cylindrical portion 52b of the piston 13 is made of a soft material. Alternatively, only the lower end of the lower cylindrical portion 52b may be made of a soft material. The dispenser 2 according to this embodiment also has the same effects as the dispenser 1 according to the first embodiment.

[0041] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0042] For example, the ejector may be configured such that a lever is used to press down an ejection head to eject the liquid content from an ejection hole. The biasing member 17 may be provided, for example, inside the cylinder 15, etc., in contact with the liquid contained therein. The step portion 22 may be a protrusion that protrudes radially inward from the inner circumferential surface of the cylinder 15 and extends continuously in the circumferential direction. The step 22 does not have to be formed on the inner peripheral surface of the cylinder 15 .

[0043] In addition, within the scope of the spirit of the present invention, it is possible to replace the components in the above-described embodiments with well-known components as appropriate, and the above-described embodiments and the above-described variations may be combined as appropriate. [Explanation of symbols]

[0044] 1, 2 Dispenser 11 Stem 13 Piston 14 Piston guide 15 cylinders 17. Biasing member 19 Support tube 22 Step section 24 Contact part 51 Sliding contact part 52 Occlusion A. Containment space

Claims

1. a stem that is provided so as to be movable downward in an upward biased state; a cylindrical piston linked to the up and down movement of the stem; a piston guide that protrudes downward from the stem and penetrates the inside of the piston in the vertical direction; a cylinder in which the piston is accommodated so as to be slidable up and down, and a portion located below the piston guide is a space for accommodating the liquid; a biasing member formed of a synthetic resin material and supporting the stem in an upward biased state so as to be movable downward; The piston has: a cylindrical closing portion exteriorly mounted on the piston guide so as to be movable up and down relative to the piston guide; a cylindrical sliding contact portion fitted in the cylinder so as to be vertically slidable, the piston guide is provided with an abutment portion that abuts against a lower end of the closing portion from below the closing portion to block communication between the inside of the stem and the accommodation space, a support tube is fitted into the cylinder so as to abut against an upper end of the sliding contact portion from above the sliding contact portion; A dispenser in which either the abutting portion or the lower end of the closing portion is formed of a softer material than the other, and abuts against the other in an elastically deformed state.

2. The dispenser according to claim 1 , wherein the biasing member is formed in a cylindrical shape extending in a vertical direction and surrounds the stem from the outside in a radial direction.

3. 3. The discharge device according to claim 1, wherein a step is formed on an inner peripheral surface of the cylinder, over which a lower end of the sliding contact portion moves upward when the piston, which is positioned at a lower end position, moves upward to return to its original position.

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