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 first elastic piece 10d extended toward one of a cap 10 and the head 11 and twisted in a direction away from a center axis O is provided in the other of the cap 10 and the head 11. A second elastic piece 11e twisted in a direction where it comes into contact with the first elastic piece 10d to approach a center axis O when the head 11 is advanced toward the cap 10 is provided in the other of the cap 10 and the head 11.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] The present invention relates to a pump-type dispenser comprising 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 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 first elastic piece is provided on one of the cap and the head, the first elastic piece extending toward the other of the cap and the head and bending in a direction away from the central axis of the stem; This is a pump-type dispenser in which a second elastic piece is provided on either the cap or the head, the second elastic piece contacting the first elastic piece and bending in a direction approaching the central axis of the stem when the head is advanced toward the cap.

[0008] an inner surface of the first elastic piece that comes into contact with the second elastic piece extends from a base portion to a tip portion at an incline away from a central axis of the stem, It is preferable that the outer surface of the second elastic piece that comes into contact with the first elastic piece extends from the base portion to the tip portion at an incline approaching the central axis of the stem.

[0009] an inner surface where the first elastic piece comes into contact with the second elastic piece includes an inner first contact surface, an inner second contact surface at least a portion of which is offset from the inner first contact surface in a direction toward a central axis of the stem, and an inner step surface located between the inner first contact surface and the inner second contact surface; It is preferable that the outer surface where the second elastic piece contacts the first elastic piece comprises an outer first contact surface, an outer second contact surface at least a portion of which is offset from the outer first contact surface in a direction toward the central axis of the stem, and an outer step surface located between the outer first contact surface and the outer second contact surface.

[0010] At least one of the inner first contact surface and the inner second contact surface extends from a base portion to a tip portion at an inclination in a direction away from a central axis of the stem, At least one of the first outer contact surface and the second outer contact surface preferably extends from the base portion to the tip portion at an incline approaching the central axis of the stem.

[0011] It is preferable that a plurality of the inner step surfaces and the outer step surfaces are provided, the inner step surfaces and the outer step surfaces being opposed to each other. Effect of the Invention

[0012] According to the pump type dispenser of the present invention, when the head is moved toward the cap, the first elastic piece and the second elastic piece come into contact with each other, and the first elastic piece bends away from the central axis of the stem, while the second elastic piece bends toward the central axis of the stem, so that the head can be returned to its initial position when the bent first elastic piece and the second elastic piece are restored. It is also possible to return the head to its initial position by contacting a substantially non-flexible protruding object with one elastic piece and bending only one elastic piece without using two elastic pieces, but in this case, it is necessary to bend this elastic piece significantly in order to generate a predetermined elastic force. However, when this type of elastic piece is repeatedly bent with a relatively large load, it may become sagging and its restorability may decrease, so that the head may not be able to return as intended if it is used continuously. In contrast, in the pump type dispenser of the present invention, both the first elastic piece and the second elastic piece are bent, and the elastic force to be generated by each piece can be reduced, so that the effect of sagging can be suppressed. Furthermore, according to the pump-type dispenser of the present invention, the first elastic piece and the second elastic piece as described above are used instead of a metal coil spring, so there is no need to separate the metal parts when disposing of them as in conventional pump-type dispensers, and they can be reused as resin products, making them highly recyclable. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is a vertical cross-sectional side view of the first 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 diagram showing a schematic diagram of a first elastic piece, a cap, a second elastic piece, and a head 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 6] FIG. 11 is a vertical cross-sectional side view of a second embodiment of a pump-type dispenser according to the present invention, showing a state in which the head has been moved to its upper limit. [Figure 7] 7 is a diagram showing a schematic diagram of a first elastic piece, a cap, a second elastic piece, and a head shown in FIG. 6. FIG. [Figure 8] FIG. 11 is a vertical cross-sectional side view of a third embodiment of a pump type dispenser according to the present invention, showing a state in which the head has been moved to its upper limit. [Figure 9] 9 is a diagram showing a schematic diagram of the first elastic piece, the cap, the second elastic piece, and the head shown in FIG. 8. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, a pump type dispenser 100A according to a first embodiment of the present invention will be described with reference to the drawings. In this specification and the like, the up-down direction refers to 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 refers to the direction perpendicular to the central axis O in a plane perpendicular to the central axis O, and the circumferential direction refers to the direction around the central axis O in this plane. The front side refers to the side where the nozzle 11c described later is directed (the left side in FIG. 1), and the rear side refers to the opposite side (the right side in FIG. 1). The left side and the right side refer to the left-right direction when viewed from the front side to the rear side.

[0015] The pump type dispenser 100A 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 100A is, for example, a cosmetic product (such as a milky lotion or a toner), shampoo, body soap, hand soap, facial cleanser, etc.

[0016] The pump type dispenser 100A 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 100A is basically formed in a shape centered on the central axis O.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] The pipe 4 is hollow, and its upper end is inserted into and fitted into the holding cylinder 1e.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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 100A 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 overflowing from the mouth when the container is turned over, for example.

[0026] 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. An upper part of the inner peripheral surface of the lower peripheral wall 10b bulges radially inward to fit and hold a 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 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.

[0027] Furthermore, the cap 10 includes a first elastic piece 10d extending upward from the upper surface of the top wall 10a as shown in Fig. 2. The first elastic piece 10d is plate-shaped with a length in the left-right direction shorter than the length in the front-rear direction in a plan view as shown in Fig. 3A, and is capable of bending and deforming in a direction away from the central axis O. An inner surface 10e (a radially inner surface close to the central axis O) of the first elastic piece 10d extends from a lower end (a root portion) of the first elastic piece 10d to an upper end (a tip portion) thereof, inclined in a direction away from the central axis O, as shown in Fig. 2. The first elastic pieces 10d having such a shape are provided on the right and left sides of the top wall 10a, one each (two in total).

[0028] The cap 10 also has a cylindrical upper peripheral wall 10f extending upward from the upper surface of the outer edge of the top wall 10a. As shown in Figures 1 and 3A, a pair of cap side ribs 10g are provided at a circumferential distance from each other on the front and rear sides of the radially inner side of the upper peripheral wall 10f.

[0029] 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 therein leading 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 dispenser 100A.

[0030] Furthermore, the head 11 includes a second elastic piece 11e extending downward from the lower surface of the top 11b as shown in Fig. 2. The second elastic piece 11e is plate-shaped with a left-right length shorter than a front-rear length in a plan view as shown in Fig. 3B, and is capable of bending and deforming in a direction approaching the central axis O. The outer surface 11f (the radially outer surface farther from the central axis O) of the second elastic piece 11e extends inclined toward the central axis O from the upper end (root portion) of the second elastic piece 11e toward the lower end (tip portion) as shown in Fig. 2. The second elastic pieces 11e having such a shape are provided on the right and left sides of the top 11b (total of two pieces in total).

[0031] Here, the relationship between the first elastic piece 10d and the second elastic piece 11e will be described with reference to Fig. 4. The first elastic piece 10d and the second elastic piece 11e have the same shape but different orientations, as shown in Fig. 4. The lower end of the outer surface 11f of the second elastic piece 11e is located radially inward of the upper end of the inner surface 10e of the first elastic piece 10d.

[0032] The head 11 also has a cylindrical head peripheral wall 11g extending 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, head side ribs 11h are provided on the front and rear sides of the radially inner side of the head peripheral wall 11g and on the radially outer side of the cylindrical portion 11a. The head side ribs 11h are inserted between a pair of cap side ribs 10g, and thus the head 11 is held against rotation with respect to the cap 10.

[0033] 1, the stopper 12 is interposed between the lower peripheral wall 10b and the head peripheral wall 11g and has the function of preventing the head 11 from being pushed down. The stopper 12 in this embodiment is C-shaped in a plan view, and is fitted and held in the upper peripheral wall 10f by pressing the opening of this C-shape against the upper peripheral wall 10f.

[0034] In the pump-type dispenser 100A constructed of such components, before the head 11 is pressed, as shown in Figures 1 and 2, the lower end of the outer surface 11f of the second elastic piece 11e is in contact with the upper end of the inner surface 10e of the first elastic piece 10d, and the head 11 is in a raised state (the head 11 is retracted from the cap 10).

[0035] 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.

[0036] Furthermore, when the head 11 is pushed down, the second elastic piece 11e moves downward with its outer surface 11f in contact with the inner surface 10e of the first elastic piece 10d, so that the first elastic piece 10d pressed by the second elastic piece 11e bends away from the central axis O as shown in Figure 5, and the second elastic piece 11e pressed by the first elastic piece 10d bends in a direction toward the central axis O.

[0037] Thereafter, when the pressure on the head 11 is released, the restoring force of the elastically deformed first elastic piece 10d and second elastic piece 11e 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.

[0038] In this way, the pump type dispenser 100A 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 both the first elastic piece 10d and the second elastic piece 11e are bent and the head 11 is raised by the restoring force from both, the elastic force required for each of the first elastic piece 10d and the second elastic piece 11e can be made smaller than when the head 11 is raised by the restoring force of only one of the first elastic piece 10d and the second elastic piece 11e. In other words, this type of elastic piece may become worn and its restoring ability may decrease if it is repeatedly bent with a relatively large load, so there is a risk that the head may not return as intended if it is used continuously. However, in this embodiment, the elastic force required for the first elastic piece 10d and the second elastic piece 11e is reduced, so the effect of wear can be suppressed.

[0039] In addition, the inner surface 10e of the first elastic piece 10d with which the second elastic piece 11e comes into contact extends from the lower end to the upper end of the first elastic piece 10d at an incline away from the central axis O, so that when the head 11 is pressed down, the first elastic piece 10d can be smoothly deflected in a direction away from the central axis O. And the outer surface 11f of the second elastic piece 11e with which the first elastic piece 10d comes into contact extends from the upper end to the lower end of the second elastic piece 11e at an incline approaching the central axis O, so that when the head 11 is pressed down, the second elastic piece 11e can be smoothly deflected in a direction approaching the central axis O.

[0040] Next, a pump type dispenser 100B which is a second embodiment of the pump type dispenser according to the present invention will be described with reference to Figures 6 and 7. The pump type dispenser 100B includes a first elastic piece 10h and a second elastic piece 11j instead of the first elastic piece 10d and the second elastic piece 11e included in the pump type dispenser 100A.

[0041] The first elastic piece 10h extends upward from the upper surface of the top wall 10a as shown in Fig. 6. As is clear from Fig. 7, the first elastic piece 10h is plate-shaped with a length in the left-right direction shorter than a length in the front-rear direction in a plan view, and is capable of bending and deforming in a direction away from the central axis O. One first elastic piece 10h is provided on each of the right and left sides of the top wall 10a (two in total).

[0042] The inner side surface 10j of the first elastic piece 10h (the surface on the radially inner side close to the central axis O) includes an inner first contact surface 10j1 located in the middle of the first elastic piece 10h in the front-rear direction, and inner second contact surfaces 10j2 located in front and rear of the inner first contact surface 10j1, as shown in FIG. 7. The inner first contact surface 10j1 in this embodiment extends from the lower end (root portion) of the first elastic piece 10h to the upper end (tip portion) thereof, inclined away from the central axis O. The inner second contact surface 10j2 in this embodiment extends upward from the position where the inner first contact surface 10j1 is connected to the top wall 10a as a starting point, so as to form a vertical surface. That is, the inner second contact surface 10j2 is shifted toward the central axis O (in this embodiment, toward the central axis O) relative to the inner first contact surface 10j1, and a step surface (inner step surface 10j3) is formed between the inner first contact surface 10j1 and the inner second contact surface 10j2.

[0043] The second elastic piece 11j extends downward from the lower surface of the top portion 11b as shown in Fig. 6. As is clear from Fig. 7, the second elastic piece 11j is plate-shaped with a length in the left-right direction shorter than a length in the front-rear direction in a plan view, and is capable of bending and deforming in a direction approaching the central axis O. One second elastic piece 11j is provided on each of the right and left sides of the top portion 11b (two in total).

[0044] The outer surface 11k of the second elastic piece 11j (the surface on the radially outer side far from the central axis O) includes an outer first contact surface 11k1 located in the middle of the second elastic piece 11j in the front-rear direction, and outer second contact surfaces 11k2 located in front and rear of the outer first contact surface 11k1, as shown in FIG. 7. The outer first contact surface 11k1 of this embodiment extends from the upper end (root portion) of the second elastic piece 11j toward the lower end (tip portion) thereof, inclined toward the central axis O. The outer second contact surface 11k2 of this embodiment extends downward from the position where the outer second contact surface 11k2 connects to the apex 11b as a starting point, so as to form a vertical surface. That is, the outer second contact surface 11k2 is shifted toward the central axis O (in this embodiment, away from the central axis O) relative to the outer first contact surface 11k1, and a step surface (outer step surface 11k3) is formed between the outer first contact surface 11k1 and the outer second contact surface 11k2.

[0045] The first elastic piece 10h and the second elastic piece 11j are provided in the positional relationship shown in FIG. 7. That is, in the circumferential direction, the outer second contact surface 11k2 is located where the inner first contact surface 10j1 is located, and the outer first contact surface 11k1 is located where the inner second contact surface 10j2 is located. In FIG. 7, the inner first contact surface 10j1 and the outer second contact surface 11k2 are shown separated in the vertical direction so that the positional relationship between the first elastic piece 10h and the second elastic piece 11j can be clearly shown, but the inner first contact surface 10j1 and the outer second contact surface 11k2 are in contact even when the head 11 has moved to the upper limit as shown in FIG. 6. In this state, the inner step surface 10j3 and the outer step surface 11k3 face each other and are in contact with each other or are in a state where there is a small gap between them.

[0046] In this pump-type dispenser 100B as well, when the head 11 is pressed down, the second elastic piece 11j moves downward with the outer second contact surface 11k2 contacting the inner first contact surface 10j1 of the first elastic piece 10h and the outer first contact surface 11k1 contacting the inner second contact surface 10j2, so that the first elastic piece 10h pressed by the second elastic piece 11j bends in a direction away from the central axis O, and the second elastic piece 11j pressed by the first elastic piece 10h bends in a direction toward the central axis O. When the pressure on the head 11 is released, the restoring forces of the elastically deformed first elastic piece 10h and second elastic piece 11j act on the head 11, so that the head 11 can be raised to the state shown in FIG.

[0047] The first elastic piece 10h has an inner side 10j composed of an inner first contact surface 10j1, an inner second contact surface 10j2, and an inner step surface 10j3, and has a cross-sectional shape with a complex unevenness. The second elastic piece 11j also has an outer side 11k composed of an outer first contact surface 11k1, an outer second contact surface 11k2, and an outer step surface 11k3, and has a cross-sectional shape with a complex unevenness. In other words, the second moment of area of ​​the first elastic piece 10h and the second elastic piece 11j is larger than that of a simple rectangular cross-sectional shape, and therefore the rigidity is high, so that the elastic force of the first elastic piece 10h and the second elastic piece 11j is larger, and the head 11 can be returned more reliably.

[0048] In addition, the inner first contact surface 10j1 of the first elastic piece 10h with which the second elastic piece 11j comes into contact extends from the lower end to the upper end of the first elastic piece 10h at an incline away from the central axis O, so that when the head 11 is pressed down, the first elastic piece 10h can be smoothly deflected in a direction away from the central axis O. And the outer first contact surface 11k1 of the second elastic piece 11j with which the first elastic piece 10h comes into contact extends from the upper end to the lower end of the second elastic piece 11j at an incline approaching the central axis O, so that when the head 11 is pressed down, the second elastic piece 11j can be smoothly deflected in a direction approaching the central axis O.

[0049] As described above, the inner step surface 10j3 of the first elastic piece 10h and the outer step surface 11k3 of the second elastic piece 11j face each other and are in contact with each other or are in a state where there is a small gap between them. Also, one first elastic piece 10h and one second elastic piece 11j are provided on each of the left and right sides of the pump type dispenser 100B. That is, since the pump type dispenser 100B has a plurality of inner step surfaces 10j3 and outer step surfaces 11k3 that face each other, it is possible to hold the head 11 against the cap 10 without using the cap side rib 10g and the head side rib 11h shown in FIG. 1.

[0050] Next, a pump type dispenser 100C which is a third embodiment of the pump type dispenser according to the present invention will be described with reference to Figures 8 and 9. The pump type dispenser 100C includes a first elastic piece 10k and a second elastic piece 11m instead of the first elastic piece 10d and the second elastic piece 11e included in the pump type dispenser 100A.

[0051] The first elastic piece 10k extends upward from the upper surface of the top wall 10a as shown in Fig. 8. As is clear from Fig. 9, the first elastic piece 10k is plate-shaped with a length in the left-right direction shorter than a length in the front-rear direction in a plan view, and is capable of bending and deforming in a direction away from the central axis O. One first elastic piece 10k is provided on each of the right and left sides of the top wall 10a (two in total).

[0052] The inner side surface 10m of the first elastic piece 10k (the radially inner surface close to the central axis O) has an inner first contact surface 10m1 located on the rear side of the first elastic piece 10k as shown in Fig. 9. The inner first contact surface 10m1 of this embodiment extends from the lower end (root portion) of the first elastic piece 10k toward the upper end (tip portion) thereof, inclining away from the central axis O. The inner side surface 10m also has an inner second contact surface 10m2 located in front of the inner first contact surface 10m1. The inner second contact surface 10m2 of this embodiment extends upward from the radially outer side of the position where the inner first contact surface 10m1 is connected to the top wall 10a, so as to form a vertical surface. In other words, the inner second contact surface 10m2 is shifted toward the central axis O (in this embodiment, away from the central axis O) relative to the inner first contact surface 10m1, and a step surface (inner step surface 10m3) is formed between the inner first contact surface 10m1 and the inner second contact surface 10m2.

[0053] The second elastic piece 11m extends downward from the lower surface of the top portion 11b as shown in Fig. 8. As is clear from Fig. 9, the second elastic piece 11m is plate-shaped with a length in the left-right direction shorter than a length in the front-rear direction in a plan view, and is capable of bending and deforming in a direction approaching the central axis O. One second elastic piece 11m is provided on each of the right and left sides of the top portion 11b (two in total).

[0054] The outer side surface 11n of the second elastic piece 11m (the surface on the radially outer side farther from the central axis O) has an outer first contact surface 11n1 located on the front side of the second elastic piece 11m as shown in Fig. 9. The outer first contact surface 11n1 of this embodiment extends from the upper end (root portion) of the second elastic piece 11m toward the lower end (tip portion) thereof, inclining toward the central axis O. The outer side surface 11n also has an outer second contact surface 11n2 located on the rear side of the outer first contact surface 11n1. The outer second contact surface 11n2 of this embodiment extends downward from the radially inner side of the position where the outer second contact surface 11n2 is connected to the apex 11b, so as to be a vertical surface. In other words, the outer second contact surface 11n2 is shifted toward the central axis O (in this embodiment, toward the central axis O) relative to the outer first contact surface 11n1, and a step surface (outer step surface 11n3) is formed between the outer first contact surface 11n1 and the outer second contact surface 11n2.

[0055] The first elastic piece 10k and the second elastic piece 11m are provided in the positional relationship shown in FIG. 9. That is, in the circumferential direction, the outer second contact surface 11n2 is located where the inner first contact surface 10m1 is located, and the outer first contact surface 11n1 is located where the inner second contact surface 10m2 is located. In FIG. 9, the inner first contact surface 10m1 and the outer second contact surface 11n2 are shown separated in the vertical direction so that the positional relationship between the first elastic piece 10k and the second elastic piece 11m can be clearly shown, but the inner first contact surface 10m1 and the outer second contact surface 11n2 are in contact even when the head 11 has moved to the upper limit as shown in FIG. 8. In this state, the inner step surface 10m3 and the outer step surface 11n3 are in contact or are slightly spaced apart from each other.

[0056] In this pump-type dispenser 100C as well, when the head 11 is pressed down, the second elastic piece 11m moves downward with the outer second contact surface 11n2 contacting the inner first contact surface 10m1 of the first elastic piece 10k and the outer first contact surface 11n1 contacting the inner second contact surface 10m2, so that the first elastic piece 10k pressed by the second elastic piece 11m bends in a direction away from the central axis O, and the second elastic piece 11m pressed by the first elastic piece 10k bends in a direction toward the central axis O. When the pressure on the head 11 is released, the restoring forces of the elastically deformed first elastic piece 10k and second elastic piece 11m act on the head 11, so that the head 11 can be raised to the state shown in FIG.

[0057] The first elastic piece 10k has an inner side 10m composed of an inner first contact surface 10m1, an inner second contact surface 10m2, and an inner step surface 10m3, and has a cross-sectional shape with a complex unevenness. The second elastic piece 11m also has an outer side 11n composed of an outer first contact surface 11n1, an outer second contact surface 11n2, and an outer step surface 11n3, and has a cross-sectional shape with a complex unevenness. In other words, the second moment of area of ​​the first elastic piece 10k and the second elastic piece 11m is larger and has higher rigidity than a cross-sectional shape that is a simple rectangle, so that the elastic force of the first elastic piece 10k and the second elastic piece 11m is larger, and the head 11 can be returned more reliably.

[0058] In addition, the inner first contact surface 10m1 of the first elastic piece 10k with which the second elastic piece 11m comes into contact extends from the lower end to the upper end of the first elastic piece 10k at an incline away from the central axis O, so that when the head 11 is pressed down, the first elastic piece 10k can be smoothly deflected in a direction away from the central axis O. And the outer first contact surface 11n1 of the second elastic piece 11m with which the first elastic piece 10k comes into contact extends from the upper end to the lower end of the second elastic piece 11m at an incline approaching the central axis O, so that when the head 11 is pressed down, the second elastic piece 11m can be smoothly deflected in a direction approaching the central axis O.

[0059] As described above, the inner step surface 10m3 of the first elastic piece 10k and the outer step surface 11n3 of the second elastic piece 11m face each other and are in contact with each other or are in a state where there is a small gap between them. The first elastic piece 10k and the second elastic piece 11m are provided on the left and right sides of the pump type dispenser 100C, respectively. In other words, the pump type dispenser 100C has a plurality of inner step surfaces 10m3 and outer step surfaces 11n3 that face each other, so that the head 11 can be held against the cap 10 without rotation without using the cap side rib 10g and the head side rib 11h shown in FIG. 1.

[0060] 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.

[0061] For example, the pump described above is merely an example, and the present invention also includes cases where other types of pumps are adopted. The number of the first elastic pieces 10d, etc. and the second elastic pieces 11e, etc. is not limited to that in the above-described embodiment, but can be changed as appropriate. The first elastic pieces 10d, etc. and the second elastic pieces 11e, etc. are not limited to those having a substantially rectangular shape in plan view as shown in the drawings, and may be, for example, those having an arc shape in plan view.

[0062] In the above-described embodiment, the first elastic piece 10d, etc., which bends away from the central axis O, is provided on the cap 10, and the second elastic piece 11e, etc., which bends toward the central axis O, is provided on the head 11. However, the first elastic piece 10d, etc. may be provided on the head 11, and the second elastic piece 11e, etc. may be provided on the cap 10.

[0063] The inner second contact surfaces 10j2, 10m2 may be shifted in the direction toward the central axis O (radial direction) relative to the inner first contact surfaces 10j1, 10m1 of the first elastic pieces 10h, 10k shown in Fig. 7 and Fig. 9, and are not limited to those shown in the drawings. For example, the inner first contact surface 10j1 shown in Fig. 7 may be a vertical surface located radially outward from the inner second contact surface 10j2, the inner second contact surface 10j2 may be inclined at an angle different from the inner first contact surface 10j1, or the inner first contact surface 10j1 may be a vertical surface and the inner second contact surface 10j2 may be inclined. Even in such a case, the cross-sectional shape of the first elastic piece has a complex shape with concaves and convexes, which increases the second moment of area and increases the elastic force. Similarly, the outer second contact surfaces 11k2, 11n2 may be shifted in a direction toward the central axis O (radial direction) relative to the outer first contact surfaces 11k1, 11n1 of the second elastic pieces 11j, 11m, and are not limited to those shown in the drawings. [Explanation of symbols]

[0064] 1: Cylinder 1a: Bottom wall part 1b: Cylinder wall 1c: Flange wall 1d: Inlet port 1e: Holding cylinder 1F: Ventilation duct 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:パッキン 10:キャップ 10a: Sky Wall 10b: Lower peripheral wall 10c:female part 10d: The first sex film 10e: medial side 10f: Upper peripheral wall 10g:キャップlateral lip 10h: First sex film 10j: medial surface 10j1: first inner contact surface 10j2: Second inner contact surface 10j3: medial segment difference 10k: The first sex film 10m:Inside 10m1: First contact surface on the inside 10m2: Second contact surface on the inside 10m3: Inner section difference surface 11:ヘッド 11a:Tubular part 11b: Top 11c:ノズル 11d: Spit out 11e:Second sex film 11f: Lateral surface 11g:ヘッドsurrounding wall 11h: ヘッドlateral リブ 11j: The second sex film 11k: Outer side 11k1: First contact surface on the outside 11k2: Second outer contact surface 11k3: Outer segment difference surface 11m:Second sex film 11n: Outer side 11n1: First outer contact surface 11n2: Second outer contact surface 11n3: Outer segment difference surface 12:ストッパー 100A, 100B, 100C: ポンプ type dispensing device O: Center 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 first elastic piece is provided on one of the cap and the head, the first elastic piece extending toward the other of the cap and the head and bending in a direction away from the central axis of the stem; A pump-type dispenser in which a second elastic piece is provided on either the cap or the head, the second elastic piece contacting the first elastic piece and bending in a direction approaching the central axis of the stem when the head is advanced toward the cap.

2. an inner surface of the first elastic piece that comes into contact with the second elastic piece extends from a base portion to a tip portion at an incline away from a central axis of the stem, 2. The pump-type discharger according to claim 1, wherein an outer surface of the second elastic piece that contacts the first elastic piece extends from the base portion to the tip portion at an angle approaching a central axis of the stem.

3. an inner surface where the first elastic piece comes into contact with the second elastic piece includes an inner first contact surface, an inner second contact surface at least a portion of which is offset from the inner first contact surface in a direction toward a central axis of the stem, and an inner step surface located between the inner first contact surface and the inner second contact surface; 2. The pump-type dispenser as described in claim 1, wherein the outer surface where the second elastic piece contacts the first elastic piece comprises an outer first contact surface, an outer second contact surface at least a portion of which is offset from the outer first contact surface in a direction toward the central axis of the stem, and an outer step surface located between the outer first contact surface and the outer second contact surface.

4. At least one of the inner first contact surface and the inner second contact surface extends from a base portion to a tip portion at an inclination in a direction away from a central axis of the stem, 4. The pump-type dispenser according to claim 3, wherein at least one of the first outer contact surface and the second outer contact surface extends from the base portion to the tip portion at an inclination in a direction approaching a central axis of the stem.

5. 4. The pump-type dispenser according to claim 3, wherein a plurality of the inner step surfaces and the outer step surfaces are provided in opposition to each other.

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