Dispenser

Abstract

To enable separation between a biasing member and other members to be easily performed when disposing them.SOLUTION: A dispenser comprises a piston guide 17 including an engaging portion 41 detachably engaging with a lower end of a stem 12. When the stem 12 is positioned at a lowest position thereof, the piston guide 17 engages circumferentially with a locking portion 31 provided in the cylinder 11, and restricts the rotation of the stem 12 around a central axis O relative to the cylinder 11. A downward engaging protrusion 51 protruding downward is formed on the lower end surface of the stem 12. An upward engaging protrusion 52 engaging with the downward engaging protrusion 51 is formed on a bottom surface of the engaging portion 41 of the piston guide 17. When the piston guide 17 engages with the locking portion 31, the stem 12 is rotated relative to the piston guide 17, causing the downward engaging protrusion 51 to ride up onto the upward engaging protrusion 52 so as to raise the lower end surface of the stem 12 from the bottom surface of the engaging portion 41 of the piston guide 17.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Conventionally, as shown in Patent Document 1 below, for example, there has been known a dispenser in which the contents in a cylinder can be dispensed from the discharge hole by pressing down a push-down head having a discharge hole against the biasing force of a biasing member, and the push-down head is moved back upward by the restoring force of the biasing member, thereby creating negative pressure inside the cylinder and sucking up the contents in the container body into the cylinder. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-274983 Summary of the Invention [Problem to be solved by the invention]

[0004] In this type of dispenser, since the product cannot be disassembled after use when it is to be disposed of, there is room for improvement in terms of separating and disposing of the product.

[0005] An object of the present invention is to provide a dispenser that can be disassembled after use and separated for disposal. [Means for solving the problem]

[0006] A dispenser according to one aspect of the present invention comprises a cylinder extending in a vertical direction and having an inside thereof communicating with the inside of a container body, a stem extending in a vertical direction and having an inside thereof communicating with the inside of the cylinder and being provided so as to be movable in the vertical direction, a piston fitted in the cylinder so as to be able to slide up and down and linked to the up and down movement of the stem, a push-down head attached to an upper end of the stem and having a discharge hole for discharging the content liquid in the container body, a biasing member supporting the push-down head in an upward biased state so as to be able to move downward, and a piston guide having a fitting portion that detachably fits a lower end of the stem by undercut fitting, When the stem is positioned at its lowest end position, it engages circumferentially with a locking portion provided within the cylinder, restricting rotation of the stem around the central axis relative to the cylinder, and a downwardly facing engagement protrusion that protrudes downward is formed on the lower end surface of the stem, and an upwardly facing engagement protrusion that engages with the downwardly facing engagement protrusion is formed on the bottom surface of the fitting portion of the piston guide, and when the piston guide engages with the locking portion, the stem is rotated relative to the piston guide, causing the downwardly facing engagement protrusion to ride up onto the upwardly facing engagement protrusion, and the lower end surface of the stem is raised from the bottom surface of the fitting portion of the piston guide.

[0007] When the push-down head is pressed down to position the stem at its lowest position and a rotational force is applied to the push-down head about its central axis, the piston guide would tend to rotate together with the stem, but the piston guide engages with the locking portion circumferentially, restricting the co-rotation of the piston guide and allowing the stem to rotate about its central axis relative to the piston guide. At this time, the downward engaging protrusion formed on the stem rides on the upward engaging protrusion formed on the mating portion of the piston guide, causing the lower end surface of the stem to rise from the bottom surface of the mating portion of the piston guide. This releases the upper end of the biasing member supporting the push-down head, making it possible to grasp and lift the upper end of the biasing member, facilitating the separation of the biasing member from other components when disposing of the dispenser.

[0008] At least one of the downward engaging protrusion and the upward engaging protrusion may have an inclined surface that slopes gradually upward in the direction of rotation of the stem.

[0009] When the pressing head is pressed down to position the stem at the lowest end position and the stem is rotated around the central axis relative to the piston guide, the downward engaging protrusion formed on the stem rides up on the upward engaging protrusion formed in the fitting portion of the piston guide, and the inclined surfaces of at least one of the downward engaging protrusion and the upward engaging protrusion are guided by the inclined surfaces and slide relative to the other, allowing the stem to move smoothly upward and easily release the undercut fit of the stem with the fitting portion of the piston guide. [Effects of the Invention]

[0010] According to the above aspect of the present invention, the biasing member can be easily separated from other members when discarding the device. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 2 is a longitudinal cross-sectional view of the dispenser of the embodiment. [Figure 2] 2 is a diagram showing the dispenser of FIG. 1 in a state where the stem is positioned at the lowermost position. FIG. [Figure 3] 3 is a diagram showing the dispenser of FIG. 2 in a state where the press-down head is rotated together with the stem in the circumferential direction. FIG. [Figure 4] 2. (a) is a cross-sectional view taken along line II in the figure, and (b) is a cross-sectional view taken along line II-II in FIG. [Figure 5] 1A and 1B are cross-sectional views of a dispenser showing the engagement state between the stem and the piston guide as seen from the radial direction, where FIG. 1A is a view before the stem is rotated, and FIG. 1B is a view after the stem is rotated. [Figure 6] FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 4(b). [Figure 7]3 is a view showing the dispenser of FIG. 2 in a state where a push-down head with a stem is detached from a piston guide and an upper end of a biasing member is grasped and pulled up. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, a dispenser according to an embodiment of the present invention will be described with reference to the drawings. 1 to 3, the dispenser 1 according to this embodiment includes a cylinder 11, a stem 12, a piston 13, a depression head 14, a biasing member 15, an attachment cap 16, and a piston guide 17. The cylinder 11, the stem 12, the piston 13, the attachment cap 16, and the piston guide 17 are arranged coaxially on a common axis.

[0013] Hereinafter, the common axis will be referred to as the central axis O, the side of the pressing head 14 along the central axis O will be referred to as the upper side, and the side of the cylinder 11 along the central axis O will be referred to as the lower side, the direction along the central axis O will be referred to as the up-down direction, the direction that intersects with the central axis O when viewed from the up-down direction will be referred to as the radial direction, and the direction that rotates around the central axis O will be referred to as the circumferential direction.

[0014] The attachment cap 16 is formed in a cylindrical shape with a top and an annular attachment top wall 16a. An internal thread portion is formed on the inner peripheral surface of the peripheral wall portion of the attachment cap 16, which is screwed onto the mouth portion W1 of the container body W. The mounting top wall 16a is formed with a sealing tube 16b, a support tube 21, and a covering tube 16d. The seal tube 16b protrudes downward from the mounting top wall 16a and is fitted into the upper end of the cylinder 11. The support tube 21 extends downward from the inner peripheral edge of the mounting top wall 16a and is formed into a bottomed tube shape having an annular support bottom wall 21a. The support tube 21 is located radially inward of the seal tube 16b. The support tube 21 is inserted into the cylinder 11. The covering tube 16d extends upward from the inner peripheral edge of the mounting top wall 16a.

[0015] The cylinder 11 extends in the vertical direction, and its inside is connected to the inside of the container body W. The cylinder 11 is configured by connecting a sliding cylindrical portion 22, a first fitting cylindrical portion 23, and a second fitting cylindrical portion 24 in this order from top to bottom, and is inserted into the container body W.

[0016] A flange portion 22a is formed at the upper end of the sliding cylindrical portion 22, protruding radially outward and extending continuously over the entire circumferential length. The flange portion 22a is fitted into the upper end of the attachment cap 16. The flange portion 22a is sandwiched in the vertical direction between the upper opening edge of the mouth portion W1 of the container body W and the lower surface of the attachment top wall 16a. Anti-rotation portions (not shown) are formed on the upper surface of the flange portion 22a and the lower surface of the attachment top wall 16a, respectively, which engage with each other and restrict relative rotation in the circumferential direction. The anti-rotation portion includes a recess and a protrusion that fits into the recess. The sliding cylindrical portion 22 is formed with an introduction hole 22b that opens in the radial direction and communicates between the inside of the container body W and the inside of the sliding cylindrical portion 22. The introduction hole 22b is closed by the piston 13 in a standby state where the stem 12, the push-down head 14, and the piston 13 are positioned at the uppermost positions.

[0017] The first fitting cylindrical portion 23 is formed to have a smaller diameter and be shorter than the sliding cylindrical portion 22. A lower valve body 26 that opens and closes the lower end opening of the first fitting cylindrical portion 23 is fitted into the first fitting cylindrical portion 23. The lower valve body 26 is a check valve that keeps the lower end opening of the first fitting cylindrical portion 23 closed when the sliding cylindrical portion 22 is pressurized, and opens the lower end opening of the first fitting cylindrical portion 23 when the sliding cylindrical portion 22 is depressurized. This prevents the liquid content in the sliding cylindrical portion 22 from returning to the container body W through the lower end opening of the first fitting cylindrical portion 23 when the sliding cylindrical portion 22 is pressurized, and allows the liquid content in the container body W to flow into the sliding cylindrical portion 22 when the sliding cylindrical portion 22 is depressurized. In the illustrated example, the lower valve body 26 is a three-point valve.

[0018] The second fitting cylindrical portion 24 is formed to have a smaller diameter and be longer than the first fitting cylindrical portion 23. The upper part of the pipe 27 is fitted liquid-tightly into the second fitting cylindrical portion 24. The pipe 27 extends in the vertical direction, and the lower end opening of the pipe 27 is located within the bottom of the container body W.

[0019] The stem 12 is provided integrally with the press-down head 14, extends in the vertical direction, has its inside connected to the inside of the cylinder 11, and is provided so as to be movable in the vertical direction together with the press-down head 14. The upper part of the stem 12 protrudes upward from the inside of the cylinder 11. The lower part of the stem 12 is fitted into a piston guide 17 arranged in the cylinder 11. The stem 12 is formed in a cylindrical shape with an open bottom end. Alternatively, the stem 12 may be provided separately from the press-down head 14, formed in a cylindrical shape with both vertical ends open, and attached to the press-down head 14 by, for example, a screw portion.

[0020] The stem 12 has a communication port 28. The communication port 28 opens in the radial direction and connects the inside of the stem 12 and the inside of the cylinder 11.

[0021] A stem fitting protrusion 29 is formed on the outer peripheral surface of the lower end of the stem 12 at a portion that fits into the piston guide 17. The stem fitting protrusion 29 extends continuously over the entire circumferential length.

[0022] As shown in FIGS. 4(a) and 4(b) and 5(a) and 5(b), a downwardly protruding engagement protrusion 51 is formed on the lower end surface 12a of the stem 12. The downwardly protruding engagement protrusion 51 extends radially and has a mountain-like shape in a cross section viewed from the radial direction. The downwardly protruding engagement protrusion 51 has inclined surfaces 51a and 51b on both sides in the circumferential direction that gradually incline upward in the direction of rotation of the stem 12. That is, the downwardly protruding engagement protrusion 51 has inclined surfaces 51a and 51b on both sides in the circumferential direction, sandwiching an apex 51c of the mountain-like shape. When the stem 12 is positioned at the lowest position, the downwardly protruding engagement protrusion 51 is positioned between upwardly protruding engagement protrusions 52 (described later) that are provided at intervals in the circumferential direction on the piston guide 17.

[0023] The push-down head 14 is integrally attached to the upper end of the stem 12 and has a discharge hole 14a that discharges the liquid content from the container body W. The push-down head 14 includes an attachment tube 14b and a discharge tube 14c that protrudes radially outward from the attachment tube 14b and has the discharge hole 14a formed at its tip.

[0024] The push-down head 14 is fixed integrally to the upper end of the stem 12. The stem 12 is formed on the inner periphery of the mounting tube 14b with a gap therebetween in the radial direction. That is, a radial gap is provided between the mounting tube 14b and the outer periphery of the stem 12. The push-down head 14 may also be attached to the upper end of the stem 12 so as to be detachable in response to relative rotation about the central axis O.

[0025] The piston 13 is fitted in the cylinder 11 so as to be able to slide up and down, and is linked to the up and down movement of the stem 12. The piston 13 includes a piston outer cylinder 35, a piston inner cylinder 36, and a connecting portion 37.

[0026] The piston outer cylinder 35 is fitted into the sliding cylinder portion 22 of the cylinder 11 so as to be vertically slidable. The upper part of the piston inner cylinder 36 is inserted between the inner circumferential surface of the mounting cylinder 14b of the pressing head 14 and the outer circumferential surface of the stem 12. The upper end of the piston inner cylinder 36 abuts against the inner circumferential surface of the mounting cylinder 14b in a liquid-tight manner so as to be vertically slidable. The lower part of the piston inner cylinder 36 protrudes downward from the mounting cylinder 14b. The connecting portion 37 connects the inner peripheral surface of the piston outer cylinder 35 and the outer peripheral surface of the piston inner cylinder 36. The connecting portion 37 is formed in a plate shape with its front and back surfaces facing up and down. The upper surface of the connecting portion 37 abuts against the lower surface of the support bottom wall 21a of the mounting cap 16 and is located below the lower end of the mounting cylinder 14b of the press-down head 14.

[0027] 1, when the press-down head 14 is not pressed down, the lower end of the piston inner cylinder 36 is supported by the piston guide 17, blocking communication between the portion of the sliding cylindrical portion 22 located below the piston 13 and the communication port 28. When the press-down head 14 is pressed down, as shown in FIGS. 2 and 3, as the stem 12 descends (arrow P1), the piston guide 17 moves downwardly away from the lower end of the piston inner cylinder 36, and the portion of the sliding cylindrical portion 22 located below the piston 13 is brought into communication with the communication port 28. At this time, the lower end of the mounting cylinder 14b of the press-down head 14 abuts against the piston 13. As a result, if the press-down head 14 continues to be depressed thereafter, the piston 13 also descends. After the content liquid is discharged, when the stem 12 and the depression head 14 move upward to their original position, the piston guide 17 comes into contact with the lower end of the piston inner cylinder 36, causing the piston 13 to also move upward to its original position.

[0028] The biasing member 15 supports the press-down head 14 in an upward biasing state so as to be movable downward. The biasing member 15 is a metal coil spring, and is disposed coaxially with the central axis O. In the illustrated example, the lower end of the biasing member 15 is supported on the upper surface of the support bottom wall 21 a of the attachment cap 16. Here, a support step 34 is formed on the outer peripheral surface of the mounting tube 14b of the press-down head 14, facing and spaced above the upper surface of the support bottom wall 21a, and the upper end of the urging member 15 is supported by the support step 34. The support step 34 is located above the covering tube 16d of the mounting cap 16. The press-down head 14 is equipped with a head outer tube 14d that surrounds the mounting tube 14b from the outside in the radial direction. The inner peripheral surface of the lower end of the head outer tube 14d abuts or is close to the outer peripheral surface of the upper end of the covering tube 16d, preventing water and the like outside the dispenser 1 from entering the inside of the head outer tube 14d. The portion of the biasing member 15 that protrudes upward from the cylinder 11 is covered from the outside in the radial direction by the head outer cylinder 14d and the covering cylinder 16d over the entire length in the vertical direction.

[0029] 6, in this embodiment, a locking portion 31 is provided inside the cylinder 11. The locking portion 31 is formed on the inner circumferential surface of the lower end portion of the sliding cylindrical portion 22 of the cylinder 11. The locking portion 31 extends upward from the connection portion between the sliding cylindrical portion 22 and the first fitting cylindrical portion 23.

[0030] 1, the piston guide 17 is formed in the shape of a flange that protrudes radially outward from the outer circumferential surface of the stem 12. The piston guide 17 is located below the communication port .

[0031] The piston guide 17 supports the lower end of the piston 13 and has a recessed fitting portion 41 into which the lower end of the stem 12 is detachably fitted through an undercut fit. The fitting portion 41 has an inner circumferential surface 41a extending the entire circumferential length and a bottom surface 41b connected to the lower end of the inner circumferential surface 41a. A piston guide fitting protrusion 43 is formed on the inner circumferential surface 41a of the fitting portion 41 in a portion where the stem fitting protrusion 29 formed on the lower end of the stem 12 is undercut fitted. The piston guide fitting protrusion 43 extends continuously over the entire circumferential length. The stem 12 cannot be separated from the piston guide 17 when the stem fitting protrusion 29 is fitted into the piston guide fitting protrusion 43.

[0032] The piston guide 17 is provided with a regulating portion 42 that circumferentially engages with a locking portion 31 provided in the cylinder 11 when the stem 12 is positioned at the lowermost position, and regulates the rotation of the stem 12 around the central axis O relative to the cylinder 11.

[0033] The restricting portion 42 is provided on the piston guide 17. The restricting portion 42 is formed at the radially outer end of the piston guide 17. The restricting portion 42 is located above the locking portion 31 and at the same radial position. The restricting portion 42 abuts against or is close to the inner circumferential surface of the sliding cylindrical portion 22 of the cylinder 11. When the stem 12 is located at the lowest position, the restricting portion 42 is located at the same vertical position as the locking portion 31. A plurality of the locking portions 31 and the restricting portions 42 are provided at intervals in the circumferential direction.

[0034] 6, the circumferential size of the upper end of the locking portion 31 decreases upward, and the circumferential size of the lower end of the restricting portion 42 decreases downward. In the illustrated example, both circumferential ends at the upper end of the locking portion 31 extend in a direction approaching each other in the circumferential direction as they extend upward, and both circumferential ends at the lower end of the restricting portion 42 extend in a direction approaching each other in the circumferential direction as they extend downward.

[0035] As shown in FIGS. 4(a) and 4(b) and 5(a) and 5(b), an upwardly facing engagement protrusion 52 is formed on the bottom surface 41b of the fitting portion 41 of the piston guide 17. The upwardly facing engagement protrusion 52 engages with the downwardly facing engagement protrusion 51 formed on the lower end surface 12a of the stem 12 and protrudes upward. The upwardly facing engagement protrusion 52 extends radially and has a mountain-like shape in cross section as viewed from the radial direction. A plurality of upwardly facing engagement protrusions 52 (four in this example) are provided circumferentially at predetermined intervals. The upwardly facing engagement protrusion 52 has, on both sides in the circumferential direction, inclined surfaces 52a and 52b that gradually rise upward in the rotational direction of the stem 12. That is, the upwardly facing engagement protrusion 52 has inclined surfaces 52a and 52b formed on both sides in the circumferential direction, sandwiching a peak 52c of the mountain shape.

[0036] When the regulating portion 42 engages with the locking portion 31, the stem 12 is rotated relative to the piston guide 17, causing the downward engaging protrusion 51 to ride up onto the upward engaging protrusion 52, and raising the lower end surface 12a of the stem 12 from the bottom surface 41b of the fitting portion 41 of the piston guide 17.

[0037] Next, a method for discharging the content liquid from the discharge hole 14a of the press-down head 14 will be described.

[0038] When the push-down head 14 is pressed down, the push-down head 14 and stem 12 descend relative to the piston 13, the piston guide 17 moves downward away from the lower end of the piston inner cylinder 36, and the portion of the sliding tubular portion 22 located below the piston 13 communicates with the communication port 28. At this time, the lower end of the mounting tube 14b of the push-down head 14 abuts against the piston 13. As a result, if the push-down head 14 continues to be pressed down, the biasing member 15 compresses and deforms, and the piston 13 also descends, pressurizing the sliding tubular portion 22. The content liquid in the sliding tubular portion 22 is discharged from the discharge hole 14a through the gap between the piston guide 17 and the lower end of the piston inner cylinder 36, the communication port 28, the stem 12, the mounting tube 14b, and the discharge tube 14c. During this process, the lower valve body 26 maintains the lower end opening of the first fitting tubular portion 23 closed. Thereafter, when the depression of the push-down head 14 is released, the biasing member 15 undergoes restoration deformation, causing the push-down head 14 and the stem 12 to move upward to their original state. During this process, the piston guide 17 abuts against the lower end of the piston inner cylinder 36, blocking communication between the portion of the sliding cylindrical portion 22 located below the piston 13 and the communication port 28, and the piston 13 also moves upward to its original state together with the push-down head 14 and the stem 12. This creates a negative pressure inside the sliding cylindrical portion 22, causing the lower valve body 26 to open the lower end opening of the first fitting cylindrical portion 23, and the content liquid in the container body W flows into the sliding cylindrical portion 22 through the pipe 27.

[0039] Next, a method for separating the biasing member 15 from the other members of the dispenser 1 will be described.

[0040] When the push-down head 14 is pushed down in the direction of symbol P1, and the stem 12 and piston guide 17 are positioned at their lowest positions as shown in FIG. 2, a rotational force is applied to the push-down head 14, to which the stem 12 is integrally formed, about the central axis O (in the direction of symbol E1). As a result, the piston guide 17 tends to rotate together with the push-down head 14. However, as shown in FIGS. 4(a), (b), and 6, the restricting portion 42 of the piston guide 17 engages circumferentially with the locking portion 31 in the cylinder 11, thereby restricting the co-rotation of the piston guide 17, and the stem 12 rotates about the central axis O (in the direction of arrow E1) relative to the piston guide 17.

[0041] 5(a), 5(b) and 6(a), 6(b), when the stem 12 is rotated relative to the piston guide 17 around the central axis O (in the direction of symbol E1), one inclined surface 51a of the downward engaging protrusion 51 provided on the lower end surface 12a of the stem 12 moves upward along one inclined surface 52a of the upward engaging protrusion 52 provided on the bottom surface 41b of the fitting portion 41, and attempts to climb over this upward engaging protrusion 52. As a result, as shown in FIG. 3, the stem 12 moves upward (in the direction of arrow P2), and the stem fitting protrusion 29, which is undercut-fitted with the piston guide fitting protrusion 43, climbs over the piston guide fitting protrusion 43, and the lower end of the stem 12 comes off the fitting portion 41 of the piston guide 17, allowing the push-down head 14 to be released from the piston guide 17 together with the stem 12.

[0042] 7, the upper end of the urging member 15 that has been supporting the press-down head 14 is released. At this time, the upper end of the urging member 15 protrudes upward from the upper end of the covering tube 16d and is exposed, so that the upper end of the urging member 15 can be easily grasped and pulled up.

[0043] Here, the upper surface of the flange portion 22a of the cylinder 11 and the lower surface of the mounting top wall 16a are each formed with anti-rotation portions (not shown) that engage with each other and restrict relative rotation in the circumferential direction.Therefore, when the stem 12 is positioned at the lowest end position, the mounting cap 16 is fixed, and a rotational force around the central axis O is applied to the pressing head 14, even if this rotational force is transmitted to the cylinder 11 via the locking portion 31 and the regulating portion 32, the cylinder 11 can be restricted from rotating relative to the mounting cap 16.

[0044] As described above, in the dispenser 1 according to this embodiment, when the push-down head 14 is pressed down to position the stem 12 at the lowest end position and a rotational force about the central axis O is applied to the push-down head 14, the stem 12 also tries to rotate together with the piston guide 17. However, the piston guide 17 circumferentially engages with the inside of the cylinder 11, restricting the co-rotation of the stem 12 and causing the stem 12 to rotate about the central axis O relative to the piston guide 17. At this time, the downward engaging protrusion 51 formed on the stem 12 rides up on the upward engaging protrusion 52 formed on the fitting portion 41 of the piston guide 17, causing the lower end surface 12a of the stem 12 to rise from the bottom surface 41b of the fitting portion 41 of the piston guide 17, disengaging the undercut fitting between the lower end of the stem 12 and the fitting portion 41, and allowing the push-down head to be removed from the piston guide 17 together with the stem 12. This releases the upper end of the urging member 15 that was supporting the push-down head 14, making it possible to grasp the upper end of the urging member 15 and pull it up, and when disposing of the dispenser 1, the urging member 15 can be easily separated from other components.

[0045] At least one of the downward engaging protrusion 51 and the upward engaging protrusion 52 has inclined surfaces 51a, 51b, 52a, 52b that gradually incline upward as they proceed in the rotation direction of the stem 12. Therefore, when the push-down head 14 is pressed down to position the stem 12 at its lowest position and the stem is rotated around the central axis O relative to the piston guide 17, when the downward engaging protrusion 51 formed on the stem 12 rides up on the upward engaging protrusion 52 formed on the fitting portion 41 of the piston guide 17, the inclined surfaces 51a, 51b, 52a, 52b of at least one of the downward engaging protrusion 51 and the upward engaging protrusion 52 slide relative to the other, guided by the inclined surfaces 51a, 51b, 52a, 52b. This allows the stem 12 to move smoothly upward, and the undercut fitting of the stem 12 with the fitting portion 41 of the piston guide 17 can be easily released.

[0046] 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.

[0047] For example, the press-down head 14 and the mounting cap 16 may be made of a transparent or translucent material so that the biasing member 15 can be seen from the outside.

[0048] In this embodiment, the biasing member 15 is a metal coil spring, but is not limited to such a material. For example, polyacetal resin (POM) may be used for the biasing member 15. If the biasing member 15 made of POM and the other components of the dispenser 1 are made of an olefin-based resin (for example, polypropylene, polyethylene, or an elastomer thereof), the biasing member 15 made of POM can be easily separated in consideration of recyclability.

[0049] Further, the downward engaging protrusion 51 and the upward engaging protrusion 52 have inclined surfaces 51a, 51b, 52a, and 52b formed on both sides, respectively, but an inclined surface may be formed on only one side. That is, when an inclined surface is formed on only one side, the downward engaging protrusion 51 and the upward engaging protrusion 52 can only rotate in one direction, where one inclined surface approaches the other.

[0050] 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]

[0051] 1 Dispenser 11 cylinders 12 Stem 12a Lower end surface 13 Piston 14 Depressor head 14a Discharge hole 15. Biasing member 17 Piston guide 28 Connecting port 29 Stem fitting protrusion 31 Locking part 41 Fitting part 41b Bottom 42 Regulatory Department 43 Piston guide fitting protrusion 51 downward engaging protrusion 51a, 51b Slope 52 upward engaging protrusion 52a, 52b sloped surface O center axis W container body W1 Mouth

Claims

1. a cylinder extending in the vertical direction and having an inside communicating with the inside of the container body; a stem extending in a vertical direction, the inside of which is in communication with the inside of the cylinder, and which is provided so as to be movable in the vertical direction; a piston fitted in the cylinder so as to be vertically slidable and linked to the vertical movement of the stem; a push-down head attached to an upper end of the stem and having a discharge hole for discharging the liquid content in the container body; a biasing member that supports the press-down head in an upward biased state so as to be movable downward; a piston guide having a fitting portion that detachably fits the lower end portion of the stem by undercut fitting; When the stem is positioned at the lowermost position, the piston guide circumferentially engages with a locking portion provided in the cylinder, thereby restricting rotation of the stem about the central axis relative to the cylinder, A downward engaging protrusion is formed on the lower end surface of the stem, an upward engaging protrusion that engages with the downward engaging protrusion is formed on a bottom surface of the fitting portion of the piston guide; When the piston guide engages with the locking portion, the stem is rotated relative to the piston guide, causing the downward engaging protrusion to ride up onto the upward engaging protrusion, and raising the lower end surface of the stem from the bottom surface of the mating portion of the piston guide.

2. The dispenser according to claim 1 , wherein at least one of the downward engaging protrusion and the upward engaging protrusion has an inclined surface that slopes gradually upward in the direction of rotation of the stem.

Images