Pump-type discharger

Abstract

To provide a pump-type discharger capable of discharging a content liquid just as conventionally and exhibiting excellent recyclability.SOLUTION: A pump-type discharger 100A comprises: a pump driven by back-and-forth movement of a stem 7a; and a head 11 having an outlet 11d and connected to the stem 7a. A plate-like extension part 11e extended toward one of the head 11 and a cap 10 is provided in the other of the head 11 and the cap 10. A pair of outer falling elastic pieces 10d sandwiching an outer edge 11g of the extension part 11e to face each other and twisted in a direction away from a center axis O by the outer edge 11g when the head 11 is advanced toward the cap 10 is provided in the other of the head 11 and the cap 10. The outer edge 11g is bent toward outside.SELECTED DRAWING: Figure 2

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 connected to the stem, in which the liquid contents in the container are dispensed from the head's outlet by moving the head towards 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] JP 2011-31950 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in this type of pump type dispenser, most of the components are made of synthetic resin, but the coil spring is made of metal. Therefore, when it is discarded after use, it cannot be recycled as a resin product in this state. In addition, in general, in this type of pump type dispenser, the components are firmly fixed to each other, for example, by fitting, to prevent the components from coming off during normal use. Therefore, it is time-consuming to disassemble the pump type dispenser and separate the coil spring from the other components.

[0006] The present invention is aimed at solving such problems, and aims to propose a pump-type dispenser that is capable of discharging the content liquid in the same manner as conventional methods, and that also has excellent recyclability. [Means for solving the problem]

[0007] A pump-type dispenser comprising: a cap that is 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 for discharging the liquid content to the outside and is connected to the stem, the head being moved toward the cap to discharge the liquid content from the discharge port, a plate-shaped extension portion extending toward the other of the head and the cap is provided on one of the head and the cap; a pair of outwardly collapsing elastic pieces are provided on either the head or the cap, the pair of outwardly collapsing elastic pieces being arranged to face each other across an outer edge of the extension portion and being deflected by the outer edge in a direction away from the central axis of the stem when the head is advanced toward the cap; The outer edge is a pump-type dispenser that is curved outwardly.

[0008] It is preferable that the outwardly-inclined elastic piece has a base wall extending along the central axis and with which the outer edge portion contacts, and a pair of protruding walls protruding from the base wall toward the central axis and facing one side wall portion and the other side wall portion of the extension portion, respectively.

[0009] a rotation prevention protrusion extending toward the other of the head and the cap is provided on either the head or the cap; It is preferable that the other of the head and the cap is provided with a rotation prevention receiving portion having a recess into which the rotation prevention protrusion is inserted. Effect of the Invention

[0010] According to the pump-type dispenser of the present invention, when the head is moved toward the cap, the outer edge of the extension comes into contact with the outwardly inclined elastic piece, and the outwardly inclined elastic piece bends in a direction away from the central axis of the stem, so that the head can be returned to its initial position when the bent outwardly inclined elastic piece is restored. Here, when the outer edge of the extension extends linearly so as to be inclined relative to the central axis of the stem, the outwardly inclined elastic piece usually inclines linearly along the outer edge of the extension, so that the outwardly inclined elastic piece comes into contact with the outer edge of the extension over its entire surface. This increases the frictional force acting between the outer edge of the extension and the outwardly inclined elastic piece, which acts as a resistance when the bent outwardly inclined elastic piece is restored, and there is a risk that the head will not return to its initial state. On the other hand, since the outer edge of the extension in the present invention is curved outward, the bent outwardly inclined elastic piece comes into contact with the outer edge of the extension at one point from the viewpoint directly facing the side wall of the extension. That is, the frictional force acting between the outer edge of the extension and the outwardly inclined elastic piece is reduced, so that the resistance between the outer edge of the extension and the outwardly inclined elastic piece when the outwardly inclined elastic piece is restored is suppressed, and the head can be more reliably returned to the initial state. In addition, since the pair of outwardly inclined elastic pieces are arranged to sandwich the outer edge of the extension, the tilt of the head during the return can be suppressed. In other words, if the head moves in a tilted state, the moving head may come into contact with other parts and hinder the return, but the pump-type dispenser of the present invention can prevent such a problem. In addition, since the pump-type dispenser of the present invention uses the outwardly inclined elastic piece described above instead of a metal coil spring, there is no need to separate metal parts when disposing of the pump-type dispenser as in the conventional pump-type dispenser, and the pump-type dispenser can be reused as a resin product, so that the recyclability is also excellent. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a vertical cross-sectional side view of one embodiment of the pump-type dispenser according to the present invention, showing a state in which the head has been moved to its upper limit. [Diagram 2] 2 is a vertical cross-sectional view taken along line AA of the pump-type dispenser shown in FIG. 1. [Figure 3A]FIG. 2 is a plan view of the cap shown in FIG. [Figure 3B] FIG. 2 is a bottom view of the head shown in FIG. [Figure 4] 2 is a schematic diagram showing an outwardly collapsing elastic piece and an extension portion shown in FIG. 1. FIG. [Diagram 5] FIG. 3 is a vertical cross-sectional view showing the pump-type dispenser shown in FIG. 2 in a state where the head has been moved to the lower limit. [Figure 6A] 1. FIG. 4 is a plan view of a cap used in a modified example of the pump-type dispenser shown in FIG. [Figure 6B] 1. FIG. 4 is a bottom view of a head used in a modified example of the pump-type dispenser shown in FIG. [Figure 7] 6C is a diagram showing a schematic view of the outwardly collapsing elastic pieces and the extension portion shown in FIG. 6A and FIG. 6B. [Figure 8A] 1. FIG. 4 is a plan view of a cap used in a further modified example of the pump-type dispenser shown in FIG. [Figure 8B] 1. FIG. 4 is a bottom view of a head used in a further modified example of the pump-type dispenser shown in FIG. [Figure 9] 8C is a diagram showing a schematic view of the outwardly collapsing elastic pieces and the extension portion shown in FIG. 8A and FIG. 8B. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] 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 and the like, the up-down direction is the direction along the illustrated central axis O (the central axis of the stem 7a described later), with the side where the pipe 4 is located being the "lower" side and the side where the head 11 is located being the "upper" side. The radial direction is the direction perpendicular to the central axis O in a plane perpendicular to the central axis O, and the circumferential direction is the direction around the central axis O in this plane. The front side is the side where the nozzle 11c described later is directed (the left side in FIG. 1), and the rear side is the opposite side (the right side in FIG. 1). The left side and the right side are the left-right directions when viewed from the front side to the rear side.

[0013] 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 toner), shampoo, body soap, hand soap, facial cleanser, etc.

[0014] 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 cylindrical member 7, a holder 8, a packing 9, a cap 10, a head 11, and a stopper 12. Here, the cylinder 1, the valve member 2, the internal member 5, the piston 6, the cylindrical member 7, and the holder 8 are members constituting the "pump" in this specification. Among the above-mentioned members, the valve member 2, the piston 6, and the packing 9 are formed of elastic soft synthetic resin (e.g., polyethylene (LDPE, HDPE, foamed PE)), and the other members are formed of hard synthetic resin (e.g., polypropylene (PP), polybutylene terephthalate (PBT), polyacetal (POM), polyketone (POK) resin, etc.). Each member constituting the pump type dispenser 100 is basically formed in a shape centered on the central axis O.

[0015] The cylinder 1 has a disk-shaped bottom wall 1a with a central portion protruding upward, a cylindrical tube wall 1b standing from the outer edge of the bottom wall 1a, and a flange wall 1c extending radially outward from the upper portion of the tube wall 1b. A through hole (suction port 1d) is provided in the protruding central portion of the bottom wall 1a. A cylindrical holding tube 1e is provided on the lower surface of the bottom wall 1a, surrounding the suction port 1d and extending downward to hold the pipe 4. A through hole (vent hole 1f) is provided in the tube wall 1b.

[0016] The valve member 2 includes a base 2a, a valve body 2b that covers the suction port 1d and is seated 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 has been closing the suction port 1d moves away from the bottom wall 1a to open the suction port 1d.

[0017] In this embodiment, the base 2a is cylindrical with a lid and has an opening (not shown) through which the liquid content passes after passing through the suction port 1d. The base 2a is fitted and held on the inner circumferential surface of the cylindrical wall portion 1b, whereby the valve member 2 is held within the cylinder 1.

[0018] The pipe 4 is hollow, and its upper end is inserted into and fitted into the holding cylinder 1e.

[0019] 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 penetrates it, and an annular portion 5d is provided on the upper surface of the bottom portion 5b, which is located radially outward from the connecting portion with the connecting tube 5a.

[0020] The piston 6 is inserted through the connecting tube 5a and disposed above the bottom 5b. The piston 6 of 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 abuts against the inner peripheral surface of the tube wall 1b. An inner sliding piece 6c extending upward and downward from the base 6a is provided on the inner edge of the base 6a. The lower part of the inner sliding piece 6c slidably and liquid-tightly abuts against the inner peripheral surface of the annular portion 5d, and the upper part of the inner sliding piece 6c slidably and liquid-tightly abuts against the inner peripheral surface of a diameter-enlarged portion 7b of the cylindrical member 7, which will be described later.

[0021] 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 inside of the stem 7a, the two are fitted together, so that the internal member 5 and the tubular member 7 move together relative to the cylinder 1.

[0022] 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 provided with a holder base 8a that is fitted and held on the inner peripheral surface of the cylindrical wall portion 1b. A flange 8b extending radially outward is provided on the upper end of the holder base 8a. The holder 8 prevents the internal member 5, the piston 6, and the cylindrical member 7 from slipping out of the cylinder 1.

[0023] The packing 9 is in the shape of an annular plate, and is inserted into and fitted into the cylindrical wall portion 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 mouth of the container and the flange wall 1c. This prevents problems such as the content liquid spilling out of the mouth when the container is turned over, for example.

[0024] The cap 10 has a disk-shaped top wall 10a with a through hole in the center. A cylindrical lower peripheral wall 10b extending downward is provided on the outer edge of the top wall 10a. The lower end of the outer peripheral surface of the lower peripheral wall 10b protrudes radially. The upper part of the inner peripheral surface of the lower 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 has a female threaded portion 10c that screws into a male threaded portion provided on the mouth of the container, and the cap 10 can be attached to the container by screwing the male threaded portion and the female threaded portion 10c together.

[0025] Furthermore, the cap 10 includes outwardly-inclined elastic pieces 10d extending upward from the upper surface of the right and left sides of the top wall 10a as shown in Fig. 2 and Fig. 3A. The outwardly-inclined elastic pieces 10d are provided in a pair oriented with the central axis O in between. In this embodiment, the outwardly-inclined elastic piece 10d includes a base wall 10e and a pair of protruding walls 10f provided on the front and rear sides of the base wall 10e and protruding toward the central axis O. That is, the outwardly-inclined elastic piece 10d is formed into a U-shape in plan view by the base wall 10e and the pair of protruding walls 10f as shown in Fig. 3A.

[0026] The cap 10 also includes a pair of anti-rotation receiving portions 10g extending upward from the front and rear upper surfaces of the top wall 10a and shaped like a U in a plan view as shown in Fig. 3A. A recess 10h is provided on the inside of the anti-rotation receiving portion 10g.

[0027] The head 11 is cylindrical and has a tubular portion 11a into which the stem 7a is inserted and fitted. The upper portion of the tubular portion 11a is provided with a top portion 11b whose upper surface is shaped to be concave downward and which has a passage inside that leads to the tubular portion 11a. The top portion 11b is provided with a nozzle 11c which is cylindrical and extends radially outward and leads to a passage provided inside the top portion 11b. The tip of the nozzle 11c is provided with a discharge port 11d through which the content liquid is discharged by the pump type discharger 100.

[0028] Furthermore, the head 11 includes a plate-shaped extension 11e extending downward from the lower surface of the top 11b as shown in FIG. 2. The extension 11e is formed to extend in the left-right direction as viewed from the bottom as shown in FIG. 3B. In addition, as shown in FIG. 2, the outer edge 11g of the extension 11e is formed to be curved outward from a viewpoint directly facing the side wall 11f of the extension 11e. The outer edge 11g of this embodiment is curved in an arc shape toward the outside. The shape of the outer edge 11g is not limited to an arc shape, and may be, for example, elliptical when viewed from this viewpoint.

[0029] Here, the relationship between the outwardly inclined elastic piece 10d and the extension portion 11e will be described with reference to Figs. 2 and 4. In Fig. 4, the extension portion 11e is shown spaced upward from the outwardly inclined elastic piece 10d so that the positional relationship between the outwardly inclined elastic piece 10d and the extension portion 11e can be clearly shown. When the head 11 is attached to the stem 7a, the extension portion 11e is located inside a pair of protruding walls 10f of the outwardly inclined elastic piece 10d. That is, in this state, the pair of protruding walls 10f face one side wall portion 11f and the other side wall portion 11f of the extension portion 11e, respectively. In addition, the outer edge portion 11g of the extension portion 11e contacts the base wall 10e of the outwardly inclined elastic piece 10d as shown in Fig. 2, and as a result, the head 11 is located at the upper limit.

[0030] The head 11 also has a cylindrical head peripheral wall 11h that extends downward from the lower surface of the outer edge of the top portion 11b (the lower surface of the nozzle 11c at the front side of the head 11 as shown in FIG. 1). As shown in FIGS. 1 and 3B, a plate-shaped anti-rotation protrusion 11j that extends downward is provided on the front and rear sides between the head peripheral wall 11h and the cylindrical portion 11a. The anti-rotation protrusion 11j is inserted into the recess 10h of the anti-rotation receiving portion 10g described above.

[0031] 1, the stopper 12 is interposed between a portion of the outer circumferential surface of the lower peripheral wall 10b that protrudes radially outward from the lower end thereof and the head peripheral wall 11h, and has the function of preventing the head 11 from being pushed down. The stopper 12 of this embodiment is C-shaped in a plan view, and is fitted and held in the lower peripheral wall 10b by pressing the opening of the C-shaped portion against the lower peripheral wall 10b.

[0032] In the pump-type dispenser 100 constructed of such components, before the head 11 is pressed, as shown in Figures 1 and 2, the outer edge 11g of the extension portion 11e is in contact with the base wall 10e of the outwardly leaning elastic piece 10d, and the head 11 is in a raised state (the head 11 is retracted from the cap 10).

[0033] Then, the stopper 12 is removed, and the head 11 is pressed from above to lower the head 11 (the head 11 is advanced toward the cap 10), and the stem 7a is pushed down together with the head 11 (the stem 7a moves toward the cap 10 along the central axis O). As the stem 7a is pushed down, the bottom part 5b also moves down via the connecting tube 5a, and the liquid-tight contact between the annular part 5d and the lower part of the inner sliding piece 6c is released. When the head 11 is further pushed down, the piston 6 also moves down together with the cylindrical member 7 and the internal member 5, and the inside of the cylinder 1 is pressurized. As a result, the liquid in the cylinder 1 passes through the communication port 5c, passes through the connecting tube 5a, the stem 7a, the cylindrical part 11a, the passage provided inside the top part 11b, and the inside of the nozzle 11c, and is discharged from the discharge port 11d to the outside world. When the head 11 is pressed and the piston 6 is lowered below the vent hole 1f, the container (not shown) communicates with the outside world through the vent hole 1f. This prevents the pressure inside the container from becoming negative even if the liquid contained in the container decreases, preventing the container from being deformed or crushed.

[0034] Furthermore, when the head 11 is pressed down, the outer edge 11g presses against the base wall 10e, so that the outwardly bending elastic piece 10d bends in a direction away from the central axis O as shown in FIG.

[0035] Thereafter, when the pressure on the head 11 is released, the restoring force of the elastically deformed outwardly inclined elastic piece 10d acts on the head 11, causing the head 11 to start rising. As a result, the piston 6 rises together with the internal member 5 while the lower part of the inner sliding piece 6c comes into liquid-tight contact with the annular portion 5d again, reducing the pressure inside the cylinder 1. As a result, the valve body portion 2b moves away from the bottom wall portion 1a, opening the suction port 1d, and the liquid content in the container can be sucked into the cylinder 1 through the pipe 4.

[0036] In this way, the pump type dispenser 100 of this embodiment can return the head 11 after discharging the liquid content without using a metal coil spring, and can be used in the same way as a conventional pump type dispenser. In addition, since the outer edge 11g of the extension 11e is curved outward, the base wall 10e of the bent outwardly inclined elastic piece 10d contacts the outer edge 11g at one point from the viewpoint directly facing the side wall 11f of the extension 11e as shown in FIG. 5. That is, since the frictional force acting between the outer edge 11g and the base wall 10e is reduced, the resistance between the outer edge 11g and the outer edge 11g when the outwardly inclined elastic piece 10d is restored is suppressed, and the head 11 can be more reliably returned to the initial state. In addition, the pair of outwardly inclined elastic pieces 10d are provided in an arrangement oriented on either side of the extension 11e, which can suppress the inclination of the rising head 11, so that the moving head 11 does not come into contact with other parts and is prevented from being hindered from rising, and the head 11 can be more reliably returned.

[0037] In the pump-type dispenser 100 of this embodiment, the anti-rotation protrusion 11j of the head 11 is inserted into the recess 10h of the anti-rotation receiving portion 10g of the cap 10, so that the head 11 can be held without rotating relative to the cap 10. In addition, the extension portion 11e of the head 11 is located inside the pair of protruding walls 10f of the outwardly inclined elastic piece 10d provided on the cap 10, so that these also enable the head 11 to be held without rotating relative to the cap 10.

[0038] As described above, the outwardly inclined elastic piece 10d of this embodiment is composed of the base wall 10e and a pair of side walls 11f, and its cross-sectional shape has a complex shape with projections and recesses. That is, the second moment of area of ​​the outwardly inclined elastic piece 10d is larger than that of a cross-sectional shape having a simple rectangular shape, and therefore the rigidity is high, so that the elastic force of the outwardly inclined elastic piece 10d is increased, and the head 11 can be returned more reliably.

[0039] Next, modified examples of the pump type dispenser 100 described above will be described with reference to FIGS. 6A, 6B, and 7. FIG.

[0040] The cap 10 in the modified pump-type dispenser 100 has two pairs of outwardly inclined elastic pieces 10d inclined at 45° in the front-rear and left-right directions in a plan view as shown in Fig. 6A. These outwardly inclined elastic pieces 10d are also composed of the above-mentioned base wall 10e and a pair of protruding walls 10f.

[0041] The head 11 of the pump-type dispenser 100 of the modified example is provided with two extending portions 11e that extend at an angle of 45° relative to the front-rear and left-right directions when viewed from the bottom. The outer edges 11g of the extending portions 11e are also curved in an arc shape toward the outside.

[0042] The outwardly-inclined elastic piece 10d and the extending portion 11e of the modified pump-type dispenser 100 are in the positional relationship shown in Fig. 7. As in Fig. 4 described above, in Fig. 7, the extending portion 11e is shown spaced upward from the outwardly-inclined elastic piece 10d in order to clearly show the positional relationship between the outwardly-inclined elastic piece 10d and the extending portion 11e, and in reality, the outer edge portion 11g is in contact with the base wall 10e. As is clear from Fig. 7, in the modified pump-type dispenser 100 as well, the extending portion 11e is located inside the pair of protruding walls 10f of the outwardly-inclined elastic piece 10d, the outer edge portion 11g is in contact with the base wall 10e, and the head 11 is at the upper limit.

[0043] In the modified pump type dispenser 100 as well, when the head 11 is pushed down, the outer edge portion 11g presses against the base wall 10e, causing the outwardly inclined elastic piece 10d to bend in a direction away from the central axis O. When the pressure on the head 11 is subsequently released, the restoring force of the elastically deformed outwardly inclined elastic piece 10d acts on the head 11, causing the head 11 to rise. In the modified pump type dispenser 100, two pairs of outwardly inclined elastic pieces 10d and two extension portions 11e are provided, and since the numbers of these are increased compared to the pump type dispenser 100 shown in FIG. 2 etc., the head 11 can be more reliably returned to its original position.

[0044] Next, a further modified example of the pump-type dispenser 100 described above will be described with reference to FIGS. 8A, 8B, and 9. FIG.

[0045] In the cap 10 of the pump-type dispenser 100 of the further modified example, as shown in Fig. 8A, a pair of outwardly inclined elastic pieces 10d facing each other in the front-rear direction in a plan view are provided on the right and left sides of the top wall 10a. These outwardly inclined elastic pieces 10d are also composed of the above-mentioned base wall 10e and a pair of protruding walls 10f. In the base wall 10e shown in Figs. 8A and 9, the inner side surface 10e1 of the base wall 10e sandwiched between the pair of protruding walls 10f is inclined from the bottom to the top so as to approach the outer side surface of the base wall 10e facing the inner side surface (see Fig. 9).

[0046] Furthermore, the head 11 of the pump-type dispenser 100 of the further modified example has extensions 11e extending in the front-rear direction in a bottom view, one on each of the right and left sides of the top 11b. The outer edges 11g of these extensions 11e are also curved outward in an arc shape.

[0047] The outwardly-inclined elastic piece 10d and the extending portion 11e of the pump-type dispenser 100 of the further modified example are in the positional relationship shown in Fig. 9. As in Fig. 4 described above, in Fig. 9, in order to clearly show the positional relationship between the outwardly-inclined elastic piece 10d and the extending portion 11e, the extending portion 11e is shown spaced upward from the outwardly-inclined elastic piece 10d, and in reality, the outer edge portion 11g is in contact with the base wall 10e. As is clear from Fig. 9, in the pump-type dispenser 100 of the further modified example, the extending portion 11e is also located inside the pair of protruding walls 10f of the outwardly-inclined elastic piece 10d, the outer edge portion 11g is in contact with the base wall 10e, and the head 11 is at the upper limit.

[0048] In the pump type dispenser 100 of the further modified example, when the head 11 is pushed down, the outer edge portion 11g presses against the base wall 10e, so that the outwardly inclined elastic piece 10d bends in a direction away from the central axis O. When the pressure on the head 11 is subsequently released, the restoring force of the elastically deformed outwardly inclined elastic piece 10d acts on the head 11, so that the head 11 can be raised. In the pump type dispenser 100 of the further modified example, two pairs of outwardly inclined elastic pieces 10d and two extension portions 11e are provided, and since the numbers of these are increased compared to the pump type dispenser 100 shown in FIG. 2 etc., the head 11 can be more reliably returned to its original position.

[0049] Although one embodiment of the present invention has been described above, the present invention is not limited to the specific embodiment, and various modifications and changes are possible within the scope of the spirit of the present invention described in the claims unless otherwise specifically limited in the above description. For example, the configuration of the above-mentioned embodiment can be appropriately added or deleted, and the configuration of one embodiment can be applied to another embodiment. Furthermore, the effects of the above-mentioned embodiment are merely examples of the effects resulting from the present invention, and do not mean that the effects of the present invention are limited to the above-mentioned effects.

[0050] For example, the pump described above is merely an example, and cases where other types of pumps are adopted are also included in the present invention. The number of the outwardly collapsing elastic pieces 10d and the extensions 11e is not limited to the above embodiment, and can be changed as appropriate.

[0051] In the above-described embodiment, the outwardly inclined elastic piece 10d that bends in a direction away from the central axis O is provided on the cap 10, and the extending portion 11e that bends in a direction toward the central axis O is provided on the head 11, but the outwardly inclined elastic piece 10d may be provided on the head 11, and the extending portion 11e may be provided on the cap 10. Similarly, the anti-rotation receiving portion 10g provided on the cap 10 may be provided on the head 11, and the anti-rotation protrusion 11j provided on the head 11 may be provided on the cap 10. [Explanation of symbols]

[0052] 1: Cylinder 1a: Bottom wall part 1b: Cylinder wall 1c: Flange wall 1d: Inlet port 1e: Holding tube 1F: Ventilation hole 2: Valve member 2a: base 2b: Valve body part 2c: Connecting piece 4: Pipe 5: Internal parts 5a: Connecting tube 5b: Bottom 5c: Communication port 5d: Ring section 6: Piston 6a: base 6b: Outer sliding piece 6c: Inner sliding piece 7: Cylindrical member 7a:Stem 7b: Expanded diameter part 8: Holder 8a: Holder base 8b: Flange 9: Packing 10: Cap 10a: Ceiling wall 10b: Lower peripheral wall 10c: Female thread 10d: Outer elastic piece 10e: Base wall 10f:Protruding wall 10g: Anti-rotation receiving part 10h: Recess 11: Head 11a: Cylindrical part 11b: Top 11c: Nozzle 11d: Discharge port 11e: Extension part 11f: Side wall part 11g: Outer edge 11h: Head wall 11j: Anti-rotation protrusion 12: Stopper 100: Pump type dispenser O: Central axis

Claims

1. A pump-type dispenser comprising: a cap that is 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 for discharging the liquid content to the outside and is connected to the stem, the head being moved toward the cap to discharge the liquid content from the discharge port, a plate-shaped extension portion extending toward the other of the head and the cap is provided on one of the head and the cap; a pair of outwardly collapsing elastic pieces are provided on either the head or the cap, the pair of outwardly collapsing elastic pieces being arranged to face each other across an outer edge of the extension portion and being deflected by the outer edge in a direction away from the central axis of the stem when the head is advanced toward the cap; The outer edge of the pump-type dispenser is curved outward.

2. 2. The pump-type dispenser according to claim 1, wherein the outwardly-inclined elastic piece has a base wall extending along the central axis and contacting the outer edge portion, and a pair of protruding walls protruding from the base wall toward the central axis and facing one side wall portion and the other side wall portion of the extending portion, respectively.

3. a rotation-preventing protrusion extending toward the other of the head and the cap is provided on either the head or the cap; 3. The pump-type dispenser according to claim 1, wherein the other of the head and the cap is provided with a rotation-stop receiving portion having a recess into which the rotation-stop projection is inserted.

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