Pump type dispenser

Abstract

To provide a pump type dispenser capable of discharging a content liquid in the same manner as a conventional one and having excellent recyclability.SOLUTION: In a pump-type dispenser 100, either heads 12, 13 or a cap 10 has an extension portion 13a, and the other of the heads 12, 13 or the cap 10 has an elastic piece 10e that is bent by the extension portion 13a in a direction away from a central axis O when the heads 12, 13 are advanced toward the cap 10. The elastic piece 10e has a root portion 10e1, a main body portion 10e2 extending from the root portion 10e1 toward either the heads 12, 13 or the cap 10, a folded portion 10e3 extending so as to be folded back relative to the main body portion 10e2, and a tip portion 10e4 extending from the folded portion 10e3 toward the base portion 10a. The extension portion 13a contacts the tip portion 10e4.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] A known pump-type dispenser includes a cap that is attached to the mouth of a container, a pump that is held at the mouth by the cap and is driven by the back and forth movement of a stem, and a head that is connected to the stem; the liquid contents in the container are dispensed from the head's outlet by moving the head toward the cap (see, for example, Patent Document 1).

[0003] As shown in Patent Document 1, a coil spring is provided inside such a pump-type dispenser to return the head, which has been moved toward the cap, to its initial position. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-31950 Summary of the Invention [Problem to be solved by the invention]

[0005] However, while most of the components of such pump-type dispensers are made of synthetic resin, the coil spring is made of metal. Therefore, when discarded after use, the pump-type dispenser cannot be recycled as a resin product in its current state. Furthermore, in general, in this type of pump-type dispenser, the components are firmly fixed to each other, for example, by fitting, to prevent them from coming apart during normal use. Therefore, it takes time and effort to disassemble the pump-type dispenser and separate the coil spring from the other components.

[0006] The present invention aims to solve these problems and to propose a pump-type dispenser that can dispense the liquid content in the same way as conventional dispensers and that is also highly recyclable. [Means for solving the problem]

[0007] The pump-type dispenser of the present invention comprises a cap attached to the mouth of a container that contains a liquid content, a pump that is held at the mouth by the cap and is driven by the back and forth movement of a stem, and a head that has a discharge port that discharges the liquid content to the outside and is connected to the stem, and in this pump-type dispenser, the liquid content in the container is discharged from the discharge port by moving the head toward the cap, and either the head or the cap has an extension portion that extends toward the other of the head and the cap, and the head and the cap The other of the caps has a base portion and an elastic piece connected to the base portion that is bent by the extension portion in a direction away from the central axis of the stem when the head is advanced toward the cap, and the elastic piece has a root portion connected to the base portion, a main body portion extending from the root portion toward either the head or the cap, a folded portion extending from the end of the main body portion opposite the root portion so as to be folded back toward the main body portion, and a tip portion extending from the folded portion toward the base portion, and the extension portion contacts the tip portion. [Effects of the Invention]

[0008] According to the pump-type dispenser of the present invention, when the head is advanced toward the cap, the elastic piece is bent by the extension, and when the bent elastic piece returns to its original position, the head can be returned to its initial position. Furthermore, because the above-mentioned elastic piece is used instead of a metal coil spring, there is no need to separate the metal parts after use, as was done with conventional pump-type dispensers, and the dispenser can be reused as a resin product as is, making it highly recyclable.

[0009] The elastic piece has the base portion, main body portion, folded portion, and tip portion, and the extension portion is configured to contact the tip portion, so that both the main body portion and the tip portion of the elastic piece can bend when the head is advanced toward the cap. In other words, the elastic force required to return the head to its initial position can be borne by both the main body portion and the tip portion. This eliminates the need to bend the main body portion as much as possible compared to an elastic piece that does not have a tip portion and obtains the necessary elastic force only from the main body portion, thereby reducing the wear of the elastic piece. Furthermore, with an elastic piece that is configured only with a main body portion and does not have a tip portion, when the head is advanced toward the cap, the contact point where the head contacts the main body portion approaches the base portion of the elastic piece, and the distance from the base portion to the contact point becomes shorter. Therefore, the force required to bend the main body portion increases gradually when the head begins to advance, but increases suddenly when the head is moved near its forward limit. That is, although the resistance force that a finger or the like receives from the head when starting to move the head forward does not change significantly, the resistance force increases suddenly as the head approaches the forward limit, and in particular, since a large elastic force is exerted only by the main body portion, the head may feel heavy to operate as the head approaches the forward limit. On the other hand, in the present invention, the extension portion provided on the head is in contact with the tip portion of the elastic piece, and the elastic force when returning the head to the initial position is borne by both the main body portion and the tip portion, so the elastic force exerted by the main body portion is reduced, and therefore the feeling when pressing the head is lighter, resulting in improved operability. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a cross-sectional side view showing a state in which a head is positioned at an upper limit (retraction limit) in one embodiment of a pump-type dispenser according to the present invention. [Figure 2] FIG. 2 is a perspective view of the periphery of the elastic piece shown in FIG. [Figure 3] 2 is a cross-sectional side view of the pump-type dispenser shown in FIG. 1, with the head positioned at the lower limit (forward limit). FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, a pump-type dispenser 100, which is one embodiment of the pump-type dispenser according to the present invention, will be described with reference to the drawings. In this specification, the up-down direction refers to the direction along the illustrated central axis O (the central axis of the stem 7a, which will be described later), with the side on which the pipe 4 is located being referred to as "down" and the side on which the head body 12 is located being referred to as "up." In this specification, the movement of the head body 12 moving downward when pressed will be described as the head body 12 advancing, and the movement of the pressed head body 12 returning upward will be described as the head body 12 retreating. For this reason, in the following description, the up-down direction will sometimes be referred to as the front-rear direction. Furthermore, the radial direction is the direction perpendicular to the central axis O within a plane perpendicular to the central axis O, and the circumferential direction is the direction circumferential around the central axis O within this plane.

[0012] The pump-type dispenser 100 of this embodiment is used by being attached to the mouth of a bottle-shaped container (not shown). The liquid content to be dispensed by the pump-type dispenser 100 is, for example, a cosmetic product (such as a milky lotion or a lotion), shampoo, body soap, hand soap, or facial cleanser.

[0013] The pump-type dispenser 100 is composed of a cylinder 1, a valve member 2, a pipe 4, an internal member 5, a piston 6, a tubular member 7, a holder 8, a packing 9, a cap 10, a cover 11, a head body 12, and a head inner member 13. The cylinder 1, the valve member 2, the internal member 5, the piston 6, the tubular member 7, and the holder 8 are components that constitute the "pump" in this specification, and the head body 12 and the head inner member 13 are components that constitute the "head" in this specification. Of the above components, the valve member 2, the piston 6, and the packing 9 are made of a flexible synthetic resin (e.g., polyethylene (LDPE, HDPE, foamed PE)), while the other components are made of a hard synthetic resin (e.g., polypropylene (PP), polybutylene terephthalate (PBT), polyacetal (POM), polyketone (POK) resin, etc.). Each component of the pump-type dispenser 100 is essentially shaped around a central axis O.

[0014] Cylinder 1 has a disk-shaped bottom wall 1a with an upwardly protruding central portion, a cylindrical tube wall 1b rising from the outer edge of bottom wall 1a, and a flange wall 1c extending radially outward from the top of tube wall 1b. A through-hole (suction port 1d) is provided in the protruding central portion of bottom wall 1a. A cylindrical holding tube 1e is provided on the underside of bottom wall 1a, surrounding suction port 1d and extending downward to hold pipe 4. A through-hole (vent hole 1f) is provided in tube wall 1b.

[0015] The valve member 2 includes a base 2a, a valve body 2b that covers the suction port 1d inside the base 2a and sits on the upper surface of the bottom wall 1a, and an elastically deformable connecting piece 2c that connects the base 2a and the valve body 2b. The valve member 2 functions as a check valve, and when the pressure inside the cylinder 1 is reduced, the valve body 2b that had been closing the suction port 1d moves away from the bottom wall 1a, opening the suction port 1d.

[0016] In this embodiment, the base 2a is cylindrical with a lid and has an opening (not shown) through which the liquid passes after passing through the suction port 1d. The base 2a is fitted and held on the inner circumferential surface of the cylindrical wall 1b, thereby holding the valve member 2 within the cylinder 1.

[0017] The pipe 4 is hollow, and its upper end is inserted into the holding cylinder 1e and is fitted and held therein.

[0018] The internal member 5 is disposed inside the cylinder 1 and is a member that moves up and down relative to the cylinder 1. The internal member 5 includes a cylindrical connecting tube 5a and a bottom portion 5b that closes the lower end of the connecting tube 5a and extends radially outward. The connecting tube 5a is provided with a hole (communication port 5c) that passes through it, and the top surface of the bottom portion 5b is provided with an annular portion 5d that is located radially outward of the connecting portion with the connecting tube 5a.

[0019] The piston 6 is inserted into the connecting tube 5a and disposed inside the cylinder 1. The piston 6 in this embodiment has an annular base 6a. An outer sliding piece 6b extending upward and downward from the base 6a is provided on the outer edge of the base 6a. The outer sliding piece 6b slidably and liquid-tightly contacts the inner circumferential surface of the cylindrical wall portion 1b. An inner sliding piece 6c extending upward and downward from the base 6a is provided on the inner edge of the base 6a. A lower part of the inner sliding piece 6c liquid-tightly contacts the annular portion 5d, and an upper part of the inner sliding piece 6c slidably and liquid-tightly contacts the inner circumferential surface of an expanded diameter portion 7b (described later) of the cylindrical member 7.

[0020] The tubular member 7 is a member having an overall tubular shape. The tubular member 7 includes a cylindrical stem 7a and an expanded diameter portion 7b that is connected to the lower end of the stem 7a and has a larger diameter than the stem 7a. When the connecting tube 5a is inserted into the stem 7a, the two are fitted together, and the internal member 5 and the tubular member 7 move integrally relative to the cylinder 1.

[0021] The holder 8 has a portion located radially outward of the stem 7a and a portion located radially outward of the expanded diameter portion 7b, and is equipped with a holder base 8a that is fitted and held on the inner circumferential surface of the cylindrical wall portion 1b. A flange 8b extending radially outward is provided at the upper end of the holder base 8a. The holder 8 prevents the internal member 5, piston 6, and cylindrical member 7 from slipping out of the cylinder 1.

[0022] The packing 9 is in the shape of an annular plate and is inserted into and fitted into the cylindrical wall 1b of the cylinder 1. When the pump-type dispenser 100 is attached to a container (not shown), the packing 9 is sandwiched between the opening of the container and the flange wall 1c. This prevents problems such as the content liquid overflowing from the opening when the container is turned over, for example.

[0023] The cap 10 has a disk-shaped top wall 10a with a central through-hole. The top wall 10a corresponds to the "base portion" in this specification. A cylindrical peripheral wall 10b extending downward is provided at the outer edge of the top wall 10a. The upper portion of the inner peripheral surface of the peripheral wall 10b bulges radially inward to fit and hold the flange wall 1c, thereby holding the cylinder 1 in the cap 10. The inner peripheral surface of the cap 10 is provided with a female threaded portion 10c that screws into a male threaded portion provided on the mouth of a container. The cap 10 can be attached to a container by screwing the male threaded portion and the female threaded portion 10c together. Furthermore, the outer peripheral surface of the peripheral wall 10b is provided with anti-rotation recesses 10d extending vertically, as shown in the partially enlarged view of FIG. 1. Multiple anti-rotation recesses 10d are provided at intervals circumferentially.

[0024] The cap 10 also includes an elastic piece 10e that is generally plate-shaped as shown in the drawings (see FIGS. 1 and 2). The elastic piece 10e is connected to the top wall 10a and is elastically deformable radially outward. The elastic piece 10e shown by the imaginary line in FIG. 1 and the elastic piece 10e shown in FIG. 2 are shown in a state before deflection (a state in which the elastic piece 10e and the extension portion 13a, described later, are not in contact with each other before the cap 10 and the head body 12 are combined). In this embodiment, a total of six elastic pieces 10e are provided on the top wall 10a at equal intervals in the circumferential direction around the central axis O. As described later, the elastic piece 10e is elastically deformed in a direction away from the central axis O by the head body 12 that is pressed upon dispensing the contents, and when the pressing force on the head body 12 is released, the elastic piece 10e returns to its original position by its restoring force.

[0025] The elastic piece 10e includes a root portion 10e1 connected to the top wall 10a and extending upward, a main body portion 10e2 extending from the root portion 10e1 toward the head main body 12 while curving in an arc that is convex with respect to the central axis O, a folded portion 10e3 extending in an arc from the upper end of the main body portion 10e2 so as to be folded back toward the main body portion 10e2, and a tip portion 10e4 connected to the folded portion 10e3 and extending downward so as to approach the central axis O. The tip portion 10e4 is provided with a bent portion 10e5 that is bent so as to protrude toward the central axis O.

[0026] The cover 11 has a cylindrical cover peripheral wall 11a. The cover peripheral wall 11a surrounds the peripheral wall 10b and the elastic piece 10e. A retaining projection 11b that protrudes radially inward and engages with the lower end of the peripheral wall 10b is provided at the lower end of the cover peripheral wall 11a. A rib 11c extending in the vertical direction is provided on the inner peripheral surface of the cover peripheral wall 11a. A lower portion of the rib 11c engages with a rotation-retaining recess 10d (see the partial enlarged view in FIG. 1), thereby preventing the cover 11 from rotating and being held by the cap 10. A middle portion of the cover peripheral wall 11a protrudes radially inward, and the lower end surface of this middle portion contacts the upper surface of the top wall 10a. As the retaining projection 11b engages with the lower end of the peripheral wall 10b as described above, the cover 11 is held by the cap 10 and prevented from rotating.

[0027] The head body 12 has a cylindrical shape and includes a tubular portion 12a into which the stem 7a is inserted and fitted. The upper portion of the tubular portion 12a is provided with a top portion 12b having an internal passageway leading to the tubular portion 12a. The top portion 12b is provided with a cylindrical nozzle 12c extending radially outward and leading to a passageway provided inside the top portion 12b. The tip of the nozzle 12c is provided with a discharge port 12d through which the content liquid is discharged by the pump-type dispenser 100. The outer peripheral portion of the head body 12 is provided with a cylindrical outer peripheral wall 12e extending downward and having a smaller diameter than the cover peripheral wall 11a. Furthermore, an annular outer fitting wall 12f and an inner fitting wall 12g extending downward are provided radially inward of the outer peripheral wall 12e. The inner peripheral surface of the outer fitting wall 12f is provided with a claw-shaped engagement portion.

[0028] The head inner member 13 is provided with an extension 13a that is cylindrical overall. A claw-shaped engagement portion is provided on the outer peripheral surface at the top of the extension 13a. The top of the extension 13a is inserted between the outer fitting wall 12f and the inner fitting wall 12g, and the engagement portion of the head main body 12 is engaged with the engagement portion of the head inner member 13, thereby holding the head inner member 13 to the head main body 12. When the head inner member 13 is held by the head main body 12, the extension 13a extends downward, and the tip end portion located at the bottom of the extension 13a (hereinafter referred to as extension tip portion 13b) extends linearly in a direction away from the central axis O as it moves upward in this embodiment.

[0029] In the pump-type dispenser 100 configured with such components, before the head body 12 is pressed, as shown in FIG. 1, the tip end 13b of the extension contacts the tip end 10e4 (more specifically, the bent portion 10e5) of the elastic piece 10e, causing the tip end 10e4 to bend slightly radially outward relative to the folded-back portion 10e3, and the main body 10e2 to bend slightly radially outward relative to the base portion 10e1, resulting in the head body 12 moving to its uppermost position (retracted position). When the head body 12 is pressed from above to lower it (moving the head body 12 forward toward the cap 10) as shown in FIG. 3, the stem 7a is pushed down together with the head body 12 (the stem 7a advances toward the cap 10 along the central axis O). As the stem 7a is pushed down, the bottom portion 5b also descends via the connecting tube 5a, releasing the liquid-tight contact between the annular portion 5d and the lower portion of the inner sliding piece 6c. When the head body 12 is further pressed down, the piston 6 descends along with the cylindrical member 7 and internal member 5, pressurizing the interior of the cylinder 1. As a result, the liquid content in the cylinder 1 passes through the communication port 5c, passes through the connecting tube 5a, the stem 7a, the cylindrical portion 12a, the passages provided inside the top portion 12b, and the inside of the nozzle 12c, and is then discharged from the discharge port 12d to the outside. Note that when the head body 12 is pressed down and the piston 6 descends below the vent port 1f, the container (not shown) communicates with the outside via the vent port 1f. This prevents the pressure inside the container from becoming negative even if the liquid content in the container decreases, preventing the container from being deformed or crushed.

[0030] Furthermore, when the head main body 12 is pressed down, the extension 13a in contact with the elastic piece 10e applies a pressing force to the elastic piece 10e, causing the elastic piece 10e to elastically deform radially outward. Specifically, the extension tip 13b in contact with the tip 10e4 applies a pressing force to the tip 10e4, causing the tip 10e4 to bend radially outward. The pressing force applied to the tip 10e4 also causes the main body 10e2 to bend radially outward. The elastic force of the elastic piece 10e elastically deformed by the extension portion 13a functions to return the depressed head body 12 to its upper limit (retraction limit), as described below. However, if an elastic piece 10e is used that has only the main body portion 10e2 and no tip portion 10e4, the elastic force that returns the head body 12 must be exerted only by the main body portion 10e2. This requires the main body portion 10e2 to bend significantly, which could result in the elastic piece 10e becoming worn when repeatedly bent. In contrast, in this embodiment, both the tip portion 10e4 and the main body portion 10e2 bend, so the elastic force that returns the head body 12 can be borne by both the tip portion 10e4 and the main body portion 10e2. In other words, since there is no need to bend the main body portion 10e2 significantly, the wear of the elastic piece 10e can be suppressed.

[0031] Furthermore, when using an elastic piece 10e having only the main body portion 10e2 without the tip portion 10e4, the portion that comes into contact with and bends the main body portion 10e2 approaches the base portion 10e1 of the elastic piece 10e when the head body 12 is pressed down. In other words, because the length from the portion that comes into contact with the main body portion 10e2 to the base portion 10e1 becomes shorter, the force required to bend the main body portion 10e2 increases gradually when the head body 12 begins to be pressed down, but increases suddenly when the head body 12 is moved close to its lower limit, which can make the operation of the head body 12 feel heavy. On the other hand, in this embodiment, the tip 13b of the extension of the head body 12 is in contact with the tip 10e4 of the elastic piece 10e, and the elastic force when returning the head body 12 toward the upper limit is borne by both the tip 10e4 and the body 10e2, thereby reducing the elastic force exerted by the body 10e2, resulting in a lighter feeling when pressing the head body 12 and improved operability.

[0032] In this embodiment, the portion where the tip 10e4 of the elastic piece 10e comes into contact with the extension tip 13b is the bent portion 10e5. That is, the elastic piece 10e comes into local contact with the extension tip 13b, which reduces the sliding resistance between the extension tip 13b and the tip 10e4, thereby making it possible to reduce the feeling of pressure on the head body 12.

[0033] In this embodiment, the inner circumferential surface of the main body 10e2 is located radially inward of the inner circumferential surface of the base 10e1 even when the head main body 12 moves from the upper limit (rear limit) position shown in Fig. 1 to the lower limit (advance limit) position shown in Fig. 3. That is, if the elastic piece 10e is configured to bend until the inner circumferential surface of the main body 10e2 is located radially outward of the inner circumferential surface of the base 10e1, the load applied to the base 10e1 increases, making the elastic piece 10e more likely to wear out. However, by configuring as described above, the load applied to the base 10e1 can be suppressed, thereby suppressing the occurrence of wear.

[0034] When the pressure on the head body 12 is subsequently released, the elastic force of the elastically deformed tip portion 10e4 and main body portion 10e2 of the elastic piece 10e acts on the head body 12, causing the head body 12 to begin to rise. Accordingly, the annular portion 5d and the lower portion of the inner sliding piece 6c once again come into liquid-tight contact, and the piston 6 rises together with the internal member 5, reducing the pressure inside the cylinder 1. This causes the valve body 2b to move away from the bottom wall portion 1a, opening the suction port 1d and allowing the liquid in the container to be drawn into the cylinder 1 through the pipe 4. In this embodiment, the six elastic pieces 10e are arranged at equal intervals around the central axis O, so the head body 12 rises while minimizing tilt with respect to the central axis O. In other words, unnecessary resistance is unlikely to act as the head body 12 rises, allowing the head body 12 to stably return to its upper limit. Subsequently, by pressing the head body 12, the liquid is again discharged from the discharge port 12d.

[0035] While one embodiment of the present invention has been described above with reference to the drawings, this embodiment may be modified as follows: For example, the pump described above is merely an example, and the present invention also includes cases in which other types of pumps are used.

[0036] The number of elastic pieces 10e and the positions where they are provided are not limited to those in the above-described embodiment and can be changed as appropriate. In the above-described embodiment, the elastic pieces 10e are provided on the cap 10 and the extensions 13a are provided on the head body 12. However, the extensions 13a may be provided on the cap 10 and the elastic pieces 10e may be provided on the head body 12.

[0037] (Addendum) In one aspect, the present specification discloses the following technology.

[0038] (Technology 1) A pump-type dispenser (100) comprising: a cap (10) to be attached to the mouth of a container that contains liquid; a pump that is held at the mouth by the cap (10) and is driven by the back and forth movement of a stem (7a); and heads (12, 13) that have a discharge port (12d) for discharging the liquid to the outside and are connected to the stem (7a), wherein the liquid in the container is discharged from the discharge port (12d) by moving the heads (12, 13) toward the cap (10), one of the head (12, 13) and the cap (10) has an extension (13a) extending toward the other of the head (12, 13) and the cap (10); the other of the heads (12, 13) and the cap (10) has a base portion (10a) and an elastic piece (10e) connected to the base portion (10a) and bent by the extension portion (13a) in a direction away from the central axis (O) of the stem (7a) when the heads (12, 13) are advanced toward the cap (10); The elastic piece (10e) has a root portion (10e1) connected to the base portion (10a), a main body portion (10e2) extending from the root portion (10e1) toward either the head (12, 13) or the cap (10), a folded portion (10e3) extending from an end of the main body portion (10e2) opposite the root portion (10e1) so as to be folded back toward the main body portion (10e2), and a tip portion (10e4) extending from the folded portion (10e3) toward the base portion (10a), The extension (13a) contacts the tip (10e4) of the pump-type discharger (100).

[0039] With this technology, the elastic force required to return the head to its initial position can be borne by both the main body and the tip, eliminating the need to significantly bend the main body and preventing the elastic piece from becoming worn. In addition, the feeling when pressing the head is lighter than when this elastic force is exerted by the main body alone, improving operability.

[0040] (Technology 2) The pump-type discharger (100) according to Art 1, wherein the tip portion (10e4) has a bent portion (10e5) that projects toward the extending portion (13a) and comes into contact with the extending portion (13a).

[0041] This technology reduces the sliding resistance between the tip of the elastic piece and the extension when the head is moved, making it easier to feel pressure on the head.

[0042] (Technology 3) The pump-type discharger (100) according to Art 1, wherein the inner circumferential surface of the main body portion (10e2) is located closer to the central axis (O) than the inner circumferential surface of the base portion (10e1) when the head moves between the backward limit and the forward limit.

[0043] This technology can reduce the load applied to the base of the elastic piece, thereby preventing the elastic piece from becoming worn when repeatedly flexed.

[0044] (Technology 4) The pump-type discharger (100) according to Art 1, wherein a plurality of the elastic pieces (10e) are provided at equal intervals on the base portion (10a) in a direction circumferentially around the central axis (O).

[0045] This technology allows the head to be retracted while suppressing tilt relative to the central axis after being advanced, thereby reducing unnecessary resistance when retracting the head and allowing the head to return stably.

[0046] Although one embodiment of the present invention has been described above, the present invention is not limited to the specific embodiment. Unless otherwise specified in the above description, various modifications and variations are possible within the spirit and scope of the present invention as defined in the claims. For example, the configurations of the above-described embodiment may be added or deleted as appropriate, and the configurations of one embodiment may be incorporated into other embodiments. Furthermore, the effects of the above-described embodiment are merely examples of the effects that can be obtained from the present invention. In other words, the effects of the present invention are not limited to the above-described effects, and additional effects may be obtained in addition to the above-described effects. [Explanation of symbols]

[0047] 7a:Stem 10: Cap 10a: Ceiling wall (base part) 10e: Elastic piece 10e1: base 10e2: Main body 10e3: Folded section 10e4: Tip 10e5: Bent part 12: Head body (head) 12d: Discharge port 13: Head inner member (head) 13a: Extension part 100: Pump type dispenser O: Central axis

Claims

1. A pump-type dispenser comprising: a cap attached to the mouth of a container that contains liquid; a pump that is held at the mouth by the cap and is driven by the back and forth movement of a stem; and a head that has a discharge port that discharges the liquid to the outside and is connected to the stem, wherein the liquid in the container is discharged from the discharge port by moving the head toward the cap, one of the head and the cap has an extension portion extending toward the other of the head and the cap; the other of the head and the cap has a base portion and an elastic piece connected to the base portion and bent by the extension portion in a direction away from the central axis of the stem when the head is advanced toward the cap, the elastic piece has a root portion connected to the base portion, a main body portion extending from the root portion toward either the head or the cap, a folded portion extending from an end of the main body portion opposite the root portion so as to be folded back toward the main body portion, and a tip portion extending from the folded portion toward the base portion, The extension portion is in contact with the tip portion of the pump-type dispenser.

2. 2. The pump-type dispenser according to claim 1, wherein the tip portion has a bent portion that projects toward the extending portion and contacts the extending portion.

3. 2. The pump-type dispenser according to claim 1, wherein the inner circumferential surface of the main body is located closer to the central axis than the inner circumferential surface of the base when the head moves between its backward and forward limits.

4. The pump-type discharger according to claim 1, wherein a plurality of the elastic pieces are provided at equal intervals on the base portion in a direction circumferentially around the central axis.

Images