Pump type discharger

Abstract

To provide a pump type discharger capable of applying an elastic force for returning a head to an initial position by a synthetic resin member and suppressing a size.SOLUTION: A pump type discharger 100 comprises: a pump driven through back-and-forth movement of a sem 7a; a head having an outlet 23a and connected to the stem 7a; a synthetic resin compression elastic part 11 provided between the head and a cap 10 and elastically deformed vertically along the center axis O of the stem 7a to bias the head in a retreating direction when the head is moved forward; an extension 21d provided in one of the head and the cap 10 and extends toward the other of the head and the cap 10; and a synthetic resin elastic piece 10k provided in the other of the head and the cap 10 and horizontally twisted along a direction around the center axis O by the extension 21d when the head is moved forward.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 forward toward the cap (see, for example, Patent Document 1).

[0003] As shown in Patent Document 1, a metal 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] In recent years, in order to reduce costs and other factors, it has been considered to replace the coil spring that returns the head to its initial position with an elastic body made of synthetic resin. However, simply changing to synthetic resin while keeping the same shape as when it was made of metal does not provide the necessary elastic force. On the other hand, if the elastic body is configured to bend significantly to increase the elastic force, the size of the device will increase.

[0006] In view of these points, the present invention aims to propose a pump-type dispenser that can exert the elastic force that returns the head to its initial position using a synthetic resin member and that can reduce its size. [Means for solving the problem]

[0007] The pump-type dispenser of the present invention comprises a cap that is attached to the mouth of a container that contains liquid contents, 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 contents to the outside and is connected to the stem, and the liquid contents in the container are discharged from the discharge port by advancing the head toward the cap.The pump-type dispenser comprises: a compressible elastic portion made of synthetic resin that is provided between the head and the cap and elastically deforms vertically along the central axis of the stem when the head is advanced, thereby urging the head in a direction to retract; an extension portion that is provided on either the head or the cap and extends toward the other of the head and the cap; and an elastic piece made of synthetic resin that is provided on the other of the head and the cap and bends laterally along a direction circumferential about the central axis by the extension portion when the head is advanced. [Effects of the Invention]

[0008] According to the pump-type dispenser of the present invention, when the head is advanced, elastic force is exerted from both the compressible elastic portion and the elastic piece, so that even if the compressible elastic portion and elastic piece are made of synthetic resin, the elastic force required to return the head to its initial position can be obtained. Here, if the elastic piece is to bend so as to approach the central axis of the stem, it would be necessary to position the elastic piece away from the central axis of the stem to avoid interference with other components when it is bent, which would result in an increase in size. However, the elastic piece of the present invention bends laterally, along the direction orbiting the central axis of the stem, so that the elastic piece can be positioned close to the central axis of the stem, thereby reducing size. Note that the elastic piece "bending sideways in a direction circumferential around the central axis of the stem" does not mean that the bending direction of the elastic piece is strictly in the circumferential direction of a circle centered on the central axis of the stem (i.e., the bending direction of the elastic piece may deviate slightly from the circumferential direction), but rather means that the elastic piece is recognized to be bending sideways when viewed from the side. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a cross-sectional side view of an embodiment of a pump-type dispenser according to the present invention, showing a state in which a head is in an initial position. [Figure 2] 4 is an enlarged view of the elastic portion and the peripheral portion of the extension portion in FIG. 1, and is a cross-sectional view taken along line BB in FIG. 3. FIG. [Figure 3] 3 is an enlarged view of the elastic portion and the surrounding area of ​​the extension portion, and is a cross-sectional view taken along line AA shown in FIG. 2. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, a pump-type dispenser 100, one embodiment of a 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 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 pressing head 22 is located being referred to as "up." Note that in this specification and the like, the downward movement of the pressing head 22 will be described as "forward," and the movement of the pressing head 22 returning upward after moving downward will be described as "rearward." For this reason, in the following description, the down side will sometimes be referred to as the front and the up side as the rear, and the above-mentioned up-down direction will sometimes be referred to as the front-to-rear direction.

[0011] 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.

[0012] 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 movable valve 8, a cap 10, a compressible elastic member 11, a packing 12, an attachment member 21, a pressure head 22, a discharge outlet member 23, a slide valve 24, a biasing member 25, a holding member 26, and a lever member 27. Here, the cylinder 1, the valve member 2, the internal member 5, the piston 6, the cylindrical member 7, and the movable valve 8 are components that make up the "pump" in this specification, etc., and the attachment member 21, the pressure head 22, the discharge outlet member 23, the slide valve 24, the biasing member 25, the holding member 26, and the lever member 27 are components that make up the "head" in this specification, etc. The configurations of the pressing head 22, discharge port member 23, slide valve 24, biasing body 25, holding member 26, lever member 27, etc. are similar to the pressing head, discharge port member, valve member, coil spring, mounting plate, lever member, etc. described in Japanese Patent No. 4098162. The slide valve 24, etc. closes the discharge port 23a, while opening the discharge port 23a when discharging the liquid contents of the container to the outside. The compressible elastic member 11 in this embodiment corresponds to the "compressible elastic portion" in this specification. In the following description, components whose materials are not specifically described are made of synthetic resin (e.g., elastic soft synthetic resins such as polyethylene (LDPE, HDPE, foamed PE, etc.) or hard synthetic resins such as polypropylene (PP), polybutylene terephthalate (PBT), polyacetal (POM), or polyketone (POK) resin). Each component of the pump-type dispenser 100 is essentially shaped around the central axis O.

[0013] Cylinder 1 has a disk-shaped bottom wall 1a with a central portion protruding upward, and a cylindrical tube wall 1b that stands up from the outer edge of bottom wall 1a. 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, not shown) is provided radially through tube wall 1b.

[0014] The valve member 2 includes a cylindrical base 2a that fits into and is held against the inner circumferential surface of the cylinder wall 1b, a plate-like 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.

[0015] The pipe 4 is hollow, and its upper end is inserted into the holding cylinder 1e and is fitted and held therein.

[0016] 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 also provided with a hole (communication port 5c) that passes through it.

[0017] 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 upper surface of the bottom portion 5b, 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.

[0018] The tubular member 7 is a member having an overall tubular shape. The tubular member 7 is cylindrical and includes a stem 7a having a stepped portion (a stepped portion in which the diameter is larger at the bottom than at the top) on its outer circumferential surface, and an expanded-diameter portion 7b connected to the lower part of the stem 7a, which expands in diameter from top to bottom and then extends downward at the same diameter. As shown in FIG. 1, the inner circumferential surface of the stem 7a is provided with a bulge located at the upper end of the stem 7a and protruding radially inward, a groove extending vertically as shown by the dashed line in FIG. 1, and a reduced-diameter portion 7c whose diameter decreases from the lower end of the groove downward and has a through-hole in the center. When the connecting tube 5a is inserted into the stem 7a as shown in FIG. 1, the two are fitted together, so that the internal member 5 and the tubular member 7 move integrally relative to the cylinder 1.

[0019] The movable valve 8 is disposed inside the stem 7a and is movable in the vertical direction between the bulging portion and the reduced diameter portion 7c. In this embodiment, the movable valve 8 is spherical and, as shown in Figure 1, sits on the upper surface of the reduced diameter portion 7c due to its own weight, blocking the through-hole provided in the center of the reduced diameter portion 7c. The diameter of the movable valve 8 is larger than the inner diameter of the bulging portion, so that the movable valve 8 will not come out of the stem 7a when it moves upward.

[0020] The cap 10 includes a cylindrical cap peripheral wall 10a and a cap upper wall 10b extending radially inward from the upper end of the cap peripheral wall 10a. An internal thread 10c is provided on the inner peripheral surface of the cap peripheral wall 10a. The internal thread 10c is adapted to be threadedly engaged with an external thread provided on the opening of a container (not shown). By threading the external thread and the internal thread 10c together, the cap 10 can be attached to the container.

[0021] The cap 10 also includes a cylindrical outer peripheral wall 10d connected to the inner edge of the cap upper wall 10b, a bottom wall 10e extending radially inward from the lower end of the outer peripheral wall 10d, and an inner peripheral wall 10f connected to the inner edge of the bottom wall 10e. An upwardly open recess 10g is defined inside the outer peripheral wall 10d, the bottom wall 10e, and the inner peripheral wall 10f.

[0022] The cap 10 includes a top wall 10h extending radially inward from the upper end of the inner circumferential wall 10f, and a cylindrical wall 10j extending downward from the inner edge of the top wall 10h. As shown in Fig. 1, the cylindrical wall portion 1b is inserted into the inner circumferential wall 10f and the cylindrical wall 10j and is fitted and held by the inner circumferential wall 10f and the cylindrical wall 10j.

[0023] The cap 10 further includes elastic pieces 10k extending upward from the upper surface of the top wall 10h. As shown in FIG. 3, a total of four elastic pieces 10k are provided in this embodiment, and they are arranged so that they form equal angles around the central axis O (in this embodiment, the central angle between adjacent elastic pieces 10k and the central axis O is 90 degrees). Each elastic piece 10k also includes an inner guide wall 10m that protrudes in the circumferential direction from its radially inner end and an outer guide wall 10n that protrudes in the circumferential direction from its radially outer end. When the pressing head 22 is moved downward, the elastic pieces 10k are configured to bend laterally when viewed from the side, as shown by the imaginary lines in FIG. 2. The inner guide wall 10m and the outer guide wall 10n in this embodiment correspond to the "guide walls" in this specification.

[0024] The compressible elastic member 11 is a member that elastically deforms in the vertical direction along the central axis O, and exerts an elastic force by elastically deforming so as to shorten (be compressed) its vertical length. The compressible elastic member 11 of this embodiment includes a pair of ring-shaped end portions 11a and an intermediate portion 11b disposed between the pair of end portions 11a and elastically deformable in the vertical direction. The shape of the intermediate portion 11b may be, for example, as illustrated in JP 2022-102886 A, a bent shape that extends circumferentially in one direction and then curves and folds back to the other circumferential direction, repeatedly provided in the vertical direction, or a spiral shape that extends from bottom to top around the central axis O; there is no particular limitation. As shown in FIG. 1, the compressible elastic member 11 of this embodiment is disposed inside the recess 10g so that the lower end portion 11a contacts the bottom wall 10e. In this embodiment, the vertical length of the recess 10g is long (specifically, as shown in FIG. 1, it is more than half the length of the compressible elastic member 11 when the pressing head 22 is in its initial state (a state in which the pressing head 22 is moving upward without being subjected to a downward pressing force)), and therefore the outer peripheral wall 10d and inner peripheral wall 10f that define the recess 10g can prevent the compressible elastic member 11 from falling over. Note that the pump-type dispenser 100 is not limited to one configured with one compressible elastic member 11 as shown in the figure, but may be one configured with a plurality of compressible elastic members 11 with short intermediate portions 11b arranged in the vertical direction.

[0025] The packing 12 is an annular plate-shaped member that is inserted into and fitted to the outer peripheral wall 10d. When the pump dispenser 100 is attached to a container (not shown), the packing 12 is sandwiched between the opening of the container and the upper cap wall 10b. This prevents problems such as the content liquid spilling out of the opening when the container is turned over, for example.

[0026] The mounting member 21 has a disk-shaped top wall 21a with a through-hole in the center. A cylindrical upper connecting tube 21b is provided on the upper surface of the top wall 21a, surrounding the through-hole in the top wall 21a and extending upward. A cylindrical lower connecting tube 21c is provided on the lower surface of the top wall 21a. When the stem 7a is inserted into the lower connecting tube 21c, the two are fitted together, and the mounting member 21, internal member 5, and cylindrical member 7 move integrally with the cylinder 1.

[0027] The mounting member 21 also includes an extension portion 21d extending downward from the lower surface of the top wall 21a. As shown in FIG. 3, the extension portion 21d in this embodiment has an arc shape centered on the central axis O. As shown in the figure, the extension portion 21d is located on the side of the elastic piece 10k where the inner guide wall 10m and the outer guide wall 10n are provided in the circumferential direction, and a total of four extension portions 21d are provided so as to form equal angles around the central axis O. The lower end of the extension portion 21d is provided with an inclined portion 21e that extends such that the length (circumferential length) at the lower end of the extension portion 21d decreases from top to bottom when viewed from the side as shown in FIG. 1. When the pressing head 22 is in its initial state (a state in which no downward pressing force is applied to the pressing head 22 and the pressing head 22 is moving upward) as shown in FIG. 2, the upper end of the inclined portion 21e contacts the elastic piece 10k. In this state, the extension portion 21d is positioned between the inner guide wall 10m and the outer guide wall 10n as shown in Figure 3, and the surface of the extension portion 21d closer to the central axis O (inner surface) faces the inner guide wall 10m, and the surface of the extension portion 21d farther from the central axis O (outer surface) faces the outer guide wall 10n.

[0028] Furthermore, as shown in Fig. 3, the mounting member 21 includes a protruding anti-rotation portion 21f that protrudes radially outward from the lower connecting tube 21c. As shown in Figs. 2 and 3, the anti-rotation portion 21f is located on the opposite side of the extension portion 21d in the circumferential direction and below the upper end of the inclined portion 21e that contacts the elastic piece 10k. When the pressing head 22 moves downward, and the mounting member 21 moves downward accordingly, the extension portion 21d bends the elastic piece 10k as shown by the imaginary line in Fig. 2, and the pressing head 22 receives a reaction force from the elastic piece 10k via the extension portion 21d in a direction orbiting around the central axis O. When the pressing head 22 attempts to rotate due to this reaction force, the anti-rotation portion 21f comes into contact with the elastic piece 10k, thereby preventing the pressing head 22 from rotating. Since the anti-rotation portion 21f is located below the upper end of the inclined portion 21e that contacts the elastic piece 10k, the deflection of the elastic piece 10k is not hindered by the anti-rotation portion 21f.

[0029] The mounting member 21 also includes a receiving portion 21g located radially outward of the extending portion 21d, as shown in Fig. 3. The receiving portion 21g in this embodiment is annular and is located at the same height as the lower end of the extending portion 21d, as shown in Fig. 2. The upper end 11a of the compressible elastic member 11 comes into contact with the lower surface of the receiving portion 21g. The receiving portion 21g is connected to the extending portion 21d by a connecting portion 21h that extends from one end of the extending portion 21d toward the inner circumferential surface of the receiving portion 21g, as shown in Fig. 3.

[0030] The pressing head 22 includes a head body 22a having a cylindrical closed lid. An opening 22b is provided on one side of the head body 22a. Inside the head body 22a, there is provided a cylindrical head connecting tube 22c into which the upper connecting tube 21b is inserted and whose inner peripheral surface slidably contacts the outer peripheral surface of the upper connecting tube 21b, a horizontal inner wall 22d extending horizontally below the opening 22b and connected to the head connecting tube 22c, and a vertical inner wall 22e extending vertically and connected to the head connecting tube 22c. An insertion opening 22f is provided through the vertical inner wall 22e.

[0031] Discharge outlet member 23 is cylindrical, and is inserted into opening 22b and fitted and held by press head 22. Here, the opening at the tip end of discharge outlet member 23 is referred to as discharge outlet 23a. Although not shown, a through-hole is provided in a portion of discharge outlet member 23 located inside press head 22, and the passage inside discharge outlet member 23 communicates with head connecting tube 22c via this through-hole.

[0032] The slide valve 24 has an overall cylindrical shape and is disposed inside the discharge outlet member 23 with its rear end protruding from the insertion opening 22f to the outside of the discharge outlet member 23. The outer circumferential surface of the slide valve 24 is provided with a seal portion 24a that slidably contacts the inner circumferential surface of the discharge outlet member 23.

[0033] The biasing body 25 is disposed between the vertically oriented inner wall 22e and the seal portion 24a and biases the slide valve 24 in a direction away from the vertically oriented inner wall 22e. The force required to start elastically deforming the biasing body 25 is set to be smaller than the force required to start elastically deforming the compressible elastic member 11 and the four elastic pieces 10k. In this embodiment, the biasing body 25 is a coil spring made of synthetic resin, but it may also be made of metal.

[0034] The holding member 26 is located below the horizontal inner wall 22d, and is inserted into the head connecting tube 22c to be fitted and held on the inner circumferential surface of the head main body 22a. The holding member 26 is provided with a pair of shaft holes 26a that support the lever member 27 so that the lever member 27 can swing.

[0035] The lever member 27 includes an engagement wall 27a that extends vertically and engages with the rear end of the slide valve 24, and an inclined wall 27b that extends downward from the lower end of the engagement wall 27a. As shown in Figure 1, the lower end of the inclined wall 27b contacts the upper surface of the top wall 21a. The lever member 27 also includes a cylindrical shaft 27c that is inserted into the shaft hole 26a.

[0036] In the pump-type dispenser 100 configured with these components, as shown in FIG. 1, before the pressing head 22 is pressed, the compressible elastic member 11 is slightly compressed vertically between the bottom wall 10e and the receiving portion 21g, and the elastic piece 10k is slightly bent horizontally with the extension portion 21d in contact with it. That is, the pressing head 22 is moved to the upper limit (retraction limit) by the elastic force of the compressible elastic member 11 and the elastic piece 10k. Note that the function of moving the pressing head 22 to the upper limit may be exerted solely by the elastic force of the compressible elastic member 11. That is, before the pressing head 22 is pressed, the compressible elastic member 11 may be slightly compressed vertically, while the extension portion 21d may be in contact with or close to the elastic piece 10k (the elastic piece 10k may not be bent). Note that the function of moving the pressing head 22 to the upper limit may be exerted solely by the elastic force of the elastic piece 10k. That is, before the pressing head 22 is pressed, the elastic piece 10k may be slightly bent laterally, while the receiving portion 21g may be in a state of contact with or close to the compressible elastic member 11 (the compressible elastic member 11 is not compressed). In the state shown in Fig. 1, the biasing body 25 biases the slide valve 24 in a direction of moving it away from the vertically oriented inner wall 22e, and the discharge port 23a is closed by the slide valve 24.

[0037] To eject the liquid content from the discharge port 23a, the pressing head 22 is pressed from above with a finger or the like to lower the pressing head 22 (to move the pressing head 22 forward toward the cap 10). As described above, the force required to start elastically deforming the biasing body 25 is set to be smaller than the force required to start elastically deforming the compressible elastic member 11 and the four elastic pieces 10k. That is, when the pressing head 22 is pressed, the pressing head 22 moves downward toward the mounting member 21 before the stem 7a is pressed down. As a result, the inclined wall 27b, whose lower end is in contact with the upper surface of the top wall 21a, causes the lever member 27 to swing about the axial hole 26a. Therefore, the slide valve 24, which engages with the engaging wall 27a, moves toward the vertically oriented inner wall 22e, opening the discharge port 23a. The pressing head 22 then continues to descend, pushing down the stem 7a. As the stem 7a is pushed down, the bottom 5b also descends via the connecting tube 5a, releasing the liquid-tight contact between the bottom 5b and the lower part of the inner sliding piece 6c. Further downward pressure on the pressing head 22 causes the piston 6 to descend along with the tubular member 7 and the internal member 5, increasing pressure inside the cylinder 1. As a result, the liquid in the cylinder 1 passes through the connecting tube 5a via the communication port 5c, moves the movable valve 8 away from the reduced diameter portion 7c, and advances through the stem 7a. Then, the liquid passes through the upper connecting tube 21b, the head connecting tube 22c, and the passage inside the discharge port member 23, and is discharged to the outside world from the discharge port 23a. As mentioned above, a vent (not shown) is provided in the cylindrical wall 1b of the cylinder 1, and when the piston 6 descends beyond the vent, the container (not shown) is connected to the outside world via the vent. 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.

[0038] Furthermore, when the pressing head 22 is pressed down, the mounting member 21 also descends via the lever member 27, which in turn causes the receiving portion 21g to also descend, thereby elastically deforming the compressible elastic member 11 in the vertical direction. At this time, the extension portion 21d also moves downward, causing the elastic piece 10k to bend laterally. As described above, the extension portion 21d is located between the inner guide wall 10m and the outer guide wall 10n of the elastic piece 10k. That is, even if the extension portion 21d behaves such that it shifts radially inward or outward relative to the elastic piece 10k, the extension portion 21d is supported by the inner guide wall 10m and the outer guide wall 10n, preventing the extension portion 21d from shifting relative to the elastic piece 10k. Furthermore, the mounting member 21 of this embodiment is provided with the aforementioned anti-rotation portion 21f, and even if a reaction force from the elastic piece 10k bending laterally acts on the extension portion 21d, the anti-rotation portion 21f comes into contact with the elastic piece 10k, thereby preventing the pressing head 22 from rotating.

[0039] When the pressure on the pressure head 22 is subsequently released, the elastic force of the elastically deformed compressible elastic member 11 and the elastic piece 10k acts on the mounting member 21, causing the stem 7a to begin to rise via the mounting member 21, and the pressure head 22 to begin to rise via the lever member 27. Furthermore, when the finger or other object pressing against the pressure head 22 leaves the top surface of the pressure head 22, the biasing element 25 returns to its original position, causing the slide valve 24 to move away from the vertically oriented inner wall 22e, thereby closing the discharge port 23a with the slide valve 24. This prevents liquid from dripping from the discharge port 23a. Furthermore, as the stem 7a rises, the bottom portion 5b 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 inner member 5, reducing the pressure inside the cylinder 1. This causes the valve body 2b to move away from the bottom wall 1a, opening the suction port 1d, allowing the liquid in the container to be sucked into the cylinder 1 through the pipe 4. Furthermore, since sufficient elastic force is exerted from both the compressible elastic member 11 and the elastic piece 10k, the pressing head 22 can be stably returned to its initial position. Thereafter, by pressing the pressing head 22, the content liquid is again discharged from the discharge port 23a.

[0040] While one embodiment of the present invention has been described above with reference to Figures 1 to 3, this embodiment may be modified as follows: For example, the pump described above is merely an example, and cases in which other types of pumps are used are also included in the present invention.

[0041] The number and positions of the elastic pieces 10k are not limited to those in the above-described embodiment and can be modified as appropriate. Furthermore, the present invention is not limited to the case where both the inner guide wall 10m and the outer guide wall 10n are provided on the elastic piece 10k; the present invention also includes a case where either one of them is provided or where both are omitted. Furthermore, the inner guide wall 10m and the outer guide wall 10n may be provided on the extension portion 21d, and the elastic piece 10k may be disposed between the inner guide wall 10m and the outer guide wall 10n. In the above-described embodiment, the elastic piece 10k is provided on the cap 10 and the extension portion 21d is provided on the mounting member 21. However, the extension portion 21d may be provided on the cap 10, and the elastic piece 10k may be provided on the mounting member 21.

[0042] (Addendum) In one aspect, the present specification discloses the following technology.

[0043] (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 a head that has a discharge port (23a) for discharging the liquid to the outside and is connected to the stem (7a), wherein the liquid in the container is discharged from the discharge port (23a) by moving the head toward the cap (10), a compressible elastic portion (11) made of synthetic resin, which is provided between the head and the cap (10), and which elastically deforms in a vertical direction along the central axis (O) of the stem (7a) when the head is advanced, thereby biasing the head in a direction to retract; an extension portion (21d) provided on either the head or the cap (10) and extending toward the other of the head and the cap (10); a synthetic resin elastic piece (10k) provided on the other of the head and the cap (10), which is bent laterally in a direction circling the central axis (O) by the extension portion (21d) when the head is advanced.

[0044] With this technology, when the head is advanced, elastic force is exerted from both the compressible elastic portion and the elastic piece, so even if the compressible elastic portion and elastic piece are made of synthetic resin, the elastic force required to return the head to its initial position can be obtained. Furthermore, because the elastic piece bends laterally along the direction circumferentially around the central axis of the stem, the elastic piece can be positioned close to the central axis of the stem, thereby reducing the size.

[0045] (Technology 2) The pump-type discharger (100) according to Technology 1, wherein either the elastic piece (10k) or the extension portion (21d) has a guide wall (10m, 10n) that supports an inner surface of the other of the elastic piece (10k) or the extension portion (21d) that is closer to the central axis (O) and / or an outer surface that is farther from the central axis (O).

[0046] With this technique, even if the extension behaves in such a way that it shifts toward or away from the central axis relative to the elastic piece, the guide wall can prevent the extension from shifting relative to the elastic piece.

[0047] (Technology 3) the head has the extension (21d), the cap (10) has the elastic piece (10k), The pump-type discharger (100) according to Technology 1, wherein the head has a rotation-preventing portion (21f) that is located on the opposite side of the extension portion (21d) and forward of the portion where the extension portion (21d) contacts the elastic piece (10k) when the head moves forward, and that engages with the elastic piece (10k) when the head moves forward to prevent the head from rotating.

[0048] With this technology, even if a reaction force from the elastic piece that bends laterally acts on the extension, the anti-rotation portion engages with the elastic piece, preventing the head from rotating.

[0049] (Technology 4) a plurality of the extension portions (21d) are provided on either the head or the cap (10) so as to form equal angles about the central axis (O); In the pump-type discharger (100) according to Technology 1, a plurality of the elastic pieces (10k) are provided at positions corresponding to the extensions (21d).

[0050] This technology allows the elastic force from the elastic piece to be applied evenly to the head in a direction circumferentially around the central axis, so that the head can be stably returned to its retraction limit.

[0051] (Technology 5) the head has the extension (21d), the cap (10) has the elastic piece (10k), The head is located on the opposite side of the central axis (O) from the extending portion (21d), and has a receiving portion (21g) that contacts one end (11a) of the compressible elastic portion (11), and a connecting portion (21h) that connects the extending portion (21d) and the receiving portion (21g).

[0052] This technology makes the structure in which the compressible elastic portion is elastically deformed in the vertical direction more suitable for mass production, making it easier to realize the present invention.

[0053] (Technology 6) The pump-type dispenser (100) according to technique 5, wherein the cap (10) has a recess (10g) that accommodates the other end (11a) of the compressible elastic portion (11).

[0054] This technique makes it possible to prevent the compressible elastic member from collapsing, and therefore allows the compressible elastic member to be elastically deformed in the vertical direction as intended.

[0055] Although one embodiment of the present invention has been described above, the present invention is not limited to this specific embodiment, and unless otherwise limited 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]

[0056] 7a:Stem 10: Cap 10g: recess 10k: Elastic piece 10m: Inner guide wall (guide wall) 10n: Outer guide wall (guide wall) 11: Compression elastic member (compression elastic portion) 21d: Extension part 21f: Anti-rotation part 21g: Receiving part 21h: Connection 23a: Discharge port 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 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, wherein the liquid content in the container is discharged from the discharge port by moving the head forward toward the cap, a compressible elastic portion made of synthetic resin, which is provided between the head and the cap and elastically deforms in a vertical direction along the central axis of the stem when the head is advanced, thereby biasing the head in a direction to retract; an extension portion provided on one of the head and the cap and extending toward the other of the head and the cap; a synthetic resin elastic piece provided on the other of the head and the cap, which is bent laterally in a direction circumferential about the central axis by the extension portion when the head is advanced.

2. 2. The pump-type dispenser according to claim 1, wherein either the elastic piece or the extension portion has a guide wall that supports an inner surface closer to the central axis and / or an outer surface farther from the central axis of the other of the elastic piece or the extension portion.

3. the head has the extension portion, and the cap has the elastic piece, 2. The pump-type dispenser according to claim 1, wherein the head is located on the opposite side of the extension portion and forward of the point where the extension portion contacts the elastic piece when the head moves forward, and has a rotation prevention portion that engages with the elastic piece when the head moves forward to prevent the head from rotating.

4. a plurality of the extension portions are provided on either the head or the cap so as to form equal angles about the central axis; The pump-type dispenser according to claim 1 , wherein a plurality of the elastic pieces are provided at positions corresponding to the extension portions.

5. the head has the extension portion, and the cap has the elastic piece, 2. The pump-type dispenser according to claim 1, wherein the head has a receiving portion located on the opposite side of the central axis from the extension portion and contacting one end of the compressible elastic portion, and a connecting portion connecting the extension portion and the receiving portion.

6. The pump-type dispenser according to claim 5 , wherein the cap has a recess that accommodates the other end of the compressible elastic portion.

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