Pump type discharger

Abstract

To propose a pump type discharger capable of discharging a liquid content in the same manner as in the past and having excellent recyclability.SOLUTION: A pump type discharger 100 includes: a pump that is driven by advance and retreat of a stem 7a; and a head 12 that has a discharge port 12d and is connected to the stem 7a. An extension part 12e is provided on either the head 12 and a cap 10 so as to extend toward the other of the head 12 and the cap 10, an elastic piece 10e is provided on the other of the head 12 and the cap 10 so as to be bent by the extension part 12e when the head 12 is advanced toward the cap 10, the elastic piece 10e includes an elastic piece body 10f and a reinforcement rib 10g, and the reinforcement rib 10g has a rib root part 10j and a rib gradual change part 10k.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a pump-type discharger.

Background Art

[0002] As a pump-type discharger, there is known one including a cap attached to the mouth of a container, a pump driven by the forward and backward movement of a stem held at the mouth by the cap, and a head connected to the stem, and discharging the content liquid in the container from the discharge port of the head by moving the head toward the cap (see, for example, Patent Document 1).

[0003] Inside such a pump-type discharger, as shown in Patent Document 1, a coil spring is provided to return the head moved toward the cap to the initial position.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in such a pump-type discharger, although most of the members are made of synthetic resin, 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. Also, generally in this type of pump-type discharger, in order to avoid members coming off during normal use, the members are firmly fixed to each other by, for example, fitting. Therefore, it takes time to disassemble the pump-type discharger and separate the coil spring from the other members.

[0006] The present invention aims to solve such problems, and it is an object of the present invention to propose a pump-type discharger that can discharge the content liquid in the same manner as the conventional one and is further excellent in recyclability.

Means for Solving the Problems

[0007] The present invention includes a cap attached to the mouth of a container for storing a content liquid, a pump driven by the stem advancing and retracting while being held at the mouth by the cap, and a head having a discharge port for discharging the content liquid to the outside and connected to the stem. In a pump-type discharger that discharges the content liquid in the container from the discharge port by moving the head toward the cap, Either the head or the cap is provided with an extension portion extending toward the other of the head and the cap. The other of the head and the cap is provided with an elastic piece that is bent by the extension portion when the head is advanced toward the cap. The elastic piece includes an elastic piece main body and a reinforcing rib that is narrower in width than the elastic piece main body. The reinforcing rib has a rib root portion located on the root side of the reinforcing rib and a rib gradually changing portion whose thickness gradually decreases from the rib root portion toward the tip side of the reinforcing rib. The pump-type discharger is such that. In this specification and the like, the rib gradually changing portion whose thickness gradually decreases does not include only those whose thickness changes along a single straight line or curve, but also those that change stepwise (in a stepped manner).

[0008] In a state where the head has moved to the forward limit, it is preferable that the tip-side end portion of the rib root portion is at the same position in the front-rear direction as the contact portion with the elastic piece in the extension portion or is located on the root side of the reinforcing rib.

[0009] Let the length in the front-rear direction from the root-side end of the reinforcing rib to the tip-side end of the extending portion in the state where the head has moved to the retraction limit be L, and let the length in the front-rear direction from the root-side end of the reinforcing rib to the tip-side end of the rib root portion in the state where the elastic piece and the extending portion are not in contact before combining the head and the cap be L1. In this case, it is preferable to satisfy the following formula (1). 0.3×L≦L1≦0.6×L···(1)

[0010] The extending portion has an arcuate inner peripheral portion that contacts the elastic piece and deflects the elastic piece. The elastic piece has an arcuate outer peripheral portion that contacts the arcuate inner peripheral portion. It is preferable that the radius of curvature of the arcuate outer peripheral portion is smaller than the radius of curvature of the arcuate inner peripheral portion.

Advantages of the Invention

[0011] According to the pump-type discharger of the present invention, when the head is moved toward the cap, the elastic piece is bent by the extending portion. Therefore, when the bent elastic piece is restored, the head can be returned to the initial position. By the way, if an elastic piece that can be bent and deformed is constantly bent with a relatively large force, sagging may occur and the resilience may decrease. On the other hand, the elastic piece of the present invention includes an elastic piece main body and a reinforcing rib. The reinforcing rib includes a rib root portion located on the root side and a rib gradual change portion whose thickness gradually decreases from the rib root portion toward the tip side of the reinforcing rib. That is, the thickness of the root side of the elastic piece becomes thick due to the rib root portion, while the thickness of the tip side of the elastic piece becomes thinner than the root side. Therefore, in the state before the head is operated (the state where the head is moved to the retracted limit and the extending portion is in contact with the tip side of the elastic piece), the tip side of the elastic piece is easily bent, while the root side of the elastic piece is difficult to bend. Therefore, by adjusting the wall thickness of the root side of the elastic piece so that the elastic force for returning the head after discharging the content is mainly generated on the root side of the elastic piece, a pump-type discharger that is not easily affected by sagging can be realized. In the state where the head is moved to the retracted limit and the extending portion is in contact with the tip side of the elastic piece, since no pressing force acts on the head, the force acting on the tip side of the elastic piece also becomes small. Therefore, the tip side of the elastic piece that remains bent in the state before operating the head can also mitigate the influence of sagging. Further, since the reinforcing rib has a rib gradual change portion, the resistance does not suddenly change when a pressing force is applied to the head, and the operability is also excellent.

[0012] Moreover, according to the pump-type discharger of the present invention, since the elastic piece as described above is used instead of a metal coil spring, there is no need to separate metal parts at the time of disposal as in the conventional pump-type discharger, and since it can be reused as a resin product, it is also excellent in recyclability.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0014] Hereinafter, a pump-type ejector 100 which is an embodiment of the pump-type ejector according to the present invention will be described with reference to the drawings. In this specification and the like, the vertical direction is the direction along the illustrated central axis O (the central axis of the stem 7a described later), the side where the pipe 4 is located is "down", and the side where the head 12 is located is "up". In this specification and the like, the movement of the head 12 being pressed and moving downward is described as the head 12 advancing, and the movement of the pressed head 12 returning upward is described as the head 12 retreating. Therefore, in the following description, the above-described vertical direction may be referred to as the front-rear direction. The radial direction is the direction orthogonal to the central axis O in a plane perpendicular to the central axis O, and the circumferential direction is the direction that circulates around the central axis O in this plane.

[0015] The pump-type ejector 100 of the present embodiment is used by being attached to the mouth of a bottle-shaped container (not shown). The content liquid to be ejected by the pump-type ejector 100 is, for example, cosmetics (such as emulsion and lotion), shampoo, body soap, hand soap, facial cleanser, etc.

[0016] The pump-type discharger 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 cover 11, and a head 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 that constitute the "pump" in this specification and the like. Among the above members, the valve member 2, the piston 6, and the packing 9 are formed of a soft synthetic resin having elasticity (for example, polyethylene (LDPE, HDPE, foamed PE)), and the other members are formed of a hard synthetic resin (for example, polypropylene (PP), polybutylene terephthalate (PBT), polyacetal (POM), polyketone (POK) resin, etc.). And each member constituting the pump-type discharger 100 is basically formed in a shape centered on the central axis O.

[0017] The cylinder 1 has a disk shape and includes a bottom wall portion 1a with a central portion protruding upward, a cylindrical wall portion 1b standing up from the outer edge portion of the bottom wall portion 1a, and a flange wall 1c extending radially outward from the upper portion of the wall portion 1b. A through hole (suction port 1d) is provided at the protruding portion of the central portion of the bottom wall portion 1a. Further, on the lower surface of the bottom wall portion 1a, a cylindrical holding cylinder 1e that surrounds the suction port 1d and extends downward to hold the pipe 4 is provided. And a through hole (vent hole 1f) is provided in the wall portion 1b.

[0018] The valve member 2 includes a base portion 2a, a valve body portion 2b that covers the suction port 1d inside the base portion 2a and seats on the upper surface of the bottom wall portion 1a, and an elastically deformable connecting piece 2c that connects the base portion 2a and the valve body portion 2b. The valve member 2 functions as a check valve. When the inside of the cylinder 1 is in a depressurized state, the valve body portion 2b that has closed the suction port 1d can be separated from the bottom wall portion 1a to open the suction port 1d.

[0019] The base 2a has a lid-shaped cylindrical form in this embodiment, with the central part of the upper surface protruding upward, and is provided with an opening (not shown) through which the content liquid passing through the suction port 1d passes. The base 2a is fitted and held on the inner peripheral surface of the cylinder 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 and held by the holding cylinder 1e.

[0021] The inner member 5 is disposed inside the cylinder 1 and is a member that moves up and down with respect to the cylinder 1. The inner member 5 includes a cylindrical connecting cylinder 5a and a bottom portion 5b that closes the lower end portion of the connecting cylinder 5a and extends radially outward. The connecting cylinder 5a is provided with a hole (communication port 5c) penetrating therethrough, and an annular portion 5d is provided on the upper surface of the bottom portion 5b, which is located radially outside the connecting portion with the connecting cylinder 5a.

[0022] The piston 6 is inserted through the connecting cylinder 5a and disposed inside the cylinder 1. The piston 6 of this embodiment includes an annular base 6a. Outer sliding pieces 6b extending upward and downward from the base 6a are provided at the outer edge portion of the base 6a. The outer sliding pieces 6b are slidably and liquid-tightly abutted against the inner peripheral surface of the cylinder wall portion 1b. Inner sliding pieces 6c extending upward and downward from the base 6a are provided at the inner edge portion of the base 6a. The lower portion of the inner sliding piece 6c is liquid-tightly abutted against the lower portion protruding radially outside in the connecting cylinder 5a, and the upper portion of the inner sliding piece 6c is slidably and liquid-tightly abutted against the inner peripheral surface of the diameter-expanded portion 7b described later in the cylindrical member 7.

[0023] The cylindrical member 7 is a member that is generally cylindrical. The cylindrical member 7 includes a cylindrical stem 7a and a diameter-expanded portion 7b that is connected to the lower end portion of the stem 7a and has a larger diameter than the stem 7a. When the connecting cylinder 5a is inserted into the stem 7a, the two are fitted together, so that the inner member 5 and the cylindrical member 7 move integrally with respect to the cylinder 1.

[0024] The holder 8 has a portion located radially outside the stem 7a and a portion located radially outside the enlarged diameter portion 7b, and includes 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 at the upper end portion of the holder base 8a. The holder 8 prevents the internal member 5, the piston 6, and the cylindrical member 7 from coming out of the cylinder 1.

[0025] The packing 9 is in the shape of an annular plate, is inserted through the cylindrical wall portion 1b of the cylinder 1, and is fitted and held thereto. When the pump type discharger 100 is attached to a container (not shown), the packing 9 is sandwiched between the mouth portion of the container and the flange wall 1c. Thereby, problems such as the content liquid overflowing from the mouth portion when the container is tilted, for example, are prevented.

[0026] The cap 10 has a disk shape and includes a top wall 10a having a through hole at the center. A cylindrical peripheral wall 10b extending downward is provided at the outer edge portion of the top wall 10a. The upper portion of the inner peripheral surface of the peripheral wall 10b bulges radially inward so that the flange wall 1c can be fitted and held, whereby the cylinder 1 is held by the cap 10. Further, a female screw portion 10c that is screwed onto a male screw portion provided at the mouth portion of the container is provided on the inner peripheral surface of the cap 10. By screwing the male screw portion and the female screw portion 10c together, the cap 10 can be attached to the container. And as shown in the partial enlarged view of FIG. 1, a rotation preventing recess 10d extending in the vertical direction is provided on the outer peripheral surface of the peripheral wall 10b. A plurality of rotation preventing recesses 10d are provided at intervals in the circumferential direction.

[0027] The cap 10 also has elastic pieces 10e that extend upward from the upper surface of the top wall 10a and are elastically deformable toward the radially inner side (see FIGS. 2, 3, and 4). Note that the elastic pieces 10e shown by solid lines in FIGS. 3 and 4 are diagrams showing the state before the elastic pieces 10e are bent (the state in which the elastic pieces 10e and the extending portions 12e described later are not in contact before the cap 10 and the head 12 are combined). A total of six elastic pieces 10e are provided at equal intervals in the circumferential direction. As will be described later, the elastic pieces 10e are elastically deformed by the head 12 pressed during the discharge of the content, and when the pressing force on the head 12 is released, the head 12 is returned with a restoring force.

[0028] The elastic piece 10e includes an elastic piece main body 10f having a plate shape and reinforcing ribs 10g that are narrower in width (shorter in circumferential length than the elastic piece main body 10f). The reinforcing ribs 10g are provided at both circumferential ends of the elastic piece main body 10f, respectively. The elastic piece main body 10f of the present embodiment has an arcuate outer peripheral portion 10h having an arcuate shape (curvature radius is Ra) as shown in FIG. 3.

[0029] The reinforcing rib 10g includes a rib root portion 10j located on the root side of the reinforcing rib 10g, a rib gradual change portion 10k whose thickness gradually decreases from the rib root portion 10j toward the tip side of the reinforcing rib 10g, and a rib tip portion 10m extending from the rib gradual change portion 10k toward the tip side of the reinforcing rib 10g. As shown in the drawing, the thickness (radial length) of the rib root portion 10j is substantially constant from the root side end portion 10n of the reinforcing rib 10g to the tip side end portion 10p of the rib root portion 10j, and is substantially the same as the thickness of the elastic piece main body 10f. The rib gradual change portion 10k extends while being slightly curved so that the thickness gradually decreases from the tip side end portion 10p of the rib root portion 10j to the tip side end portion 10q of the rib gradual change portion 10k as shown in FIG. 4. The rib tip portion 10m extends so that the thickness is substantially constant from the tip side end portion 10q of the rib gradual change portion 10k to the tip side end portion 10r of the rib tip portion 10m. The tip side end portion 10r of the rib tip portion 10m is located on the root side of the tip side end portion 10s of the reinforcing rib 10g.

[0030] By the way, if an elastic piece that can be bent and deformed is constantly bent with a relatively large force, sagging may occur and the resilience may decrease. In order to solve such a problem in the present embodiment, the base side of the elastic piece 10e is thickened by the rib base portion 10j, while the tip side is configured to be thinner than the base side. Therefore, the tip side of the elastic piece 10e is easily bent, and the base side of the elastic piece 10e is difficult to bend, so the sagging of the base side of the elastic piece 10e is suppressed. In the elastic piece 10e of the present embodiment, the elastic force for returning the head 12 is adjusted so as to be mainly generated on the base side of the elastic piece 10e including the thickness of the rib base portion 10j.

[0031] The cover 11 includes a cover peripheral wall 11a having a cylindrical shape. The cover peripheral wall 11a surrounds the peripheral wall 10b and the elastic piece 10e. At the lower end portion of the cover peripheral wall 11a, a retaining convex portion 11b that protrudes radially inward and engages with the lower end portion of the peripheral wall 10b is provided. On the inner peripheral surface of the cover peripheral wall 11a, ribs 11c extending in the vertical direction are provided. The lower part of the rib 11c engages with the anti-rotation recess 10d, and the cover 11 is rotatably held by the cap 10. The upper part of the rib 11c protrudes radially inward more than the lower part. And the lower end surface of this upper part contacts the upper surface of the top wall 10a, and by engaging the retaining convex portion 11b with the lower end portion of the peripheral wall 10b as described above, the cover 11 is retained by the cap 10 so as not to come off. At the upper end portion of the cover peripheral wall 11a, an inward flange 11d extending radially inward is provided.

[0032] The head 12 has a cylindrical shape and includes a cylindrical portion 12a into which the stem 7a is inserted and fitted and held inside. At the upper part of the cylindrical portion 12a, a top portion 12b is provided whose upper surface is formed to be concave downward and has a passage communicating with the cylindrical portion 12a inside. The top portion 12b is provided with a nozzle 12c having a cylindrical shape and extending radially outward and communicating with a passage provided inside the top portion 12b. At the tip of the nozzle 12c, a discharge port 12d through which the content liquid is discharged by the pump type discharger 100 is provided.

[0033] The head 12 also includes an extension portion 12e extending downward from the top portion 12b and the nozzle 12c. The extension portion 12e of the present embodiment is cylindrical with the central axis O as the center. Also, as shown in FIG. 1, the lower portion of the extension portion 12e is inclined so as to gradually expand radially outward as it generally extends downward, and the inner edge portion of this inclined portion contacts the outer peripheral surface of the elastic piece 10e (elastic piece main body 10f). Here, the portion of the extension portion 12e that contacts the elastic piece 10e is referred to as the contact portion 12f. Also, as shown in FIG. 3, the inner peripheral surface of the extension portion 12e provided with the contact portion 12f is referred to as the arcuate inner peripheral portion 12g, and the radius of curvature of the arcuate inner peripheral portion 12g is referred to as Rb. In the present embodiment, the radius of curvature Ra of the arcuate outer peripheral portion 10h of the elastic piece 10e described above is set to be smaller than the radius of curvature Rb of the arcuate inner peripheral portion 12g.

[0034] In the state before pressing the head 12 as shown in FIG. 1, the pump-type ejector 100 configured by such members, the contact portion 12f of the extension portion 12e contacts the elastic piece 10e, and the head 12 is in a state of being moved to the upper limit (retraction limit). The elastic piece 10e of the present embodiment has a thicker thickness on the root side by the rib root portion 10j provided with the reinforcing rib 10g, while the tip side is thinner than the root side. For this reason, in the state before pressing the head 12, as shown in FIG. 1, the tip side of the elastic piece 10e bends, while the root side of the elastic piece 10e is less likely to bend. As described above, in the elastic piece 10e of the present embodiment, the elastic force for returning the head 12 is adjusted so as to be mainly generated on the root side of the elastic piece 10e including the thickness of the rib root portion 10j. Therefore, it is possible to suppress the influence of sag while ensuring the function of returning the head 12. Also, in the state where the head 12 has moved to the upper limit, since the force acting on the tip side of the elastic piece 10e is small before pressing the head 12, it is possible to alleviate the influence of sag on the tip side of the elastic piece 10e that remains bent as shown in FIG. 1.

[0035] When the head 12 is pressed from above to lower the head 12 (advance the head 12 toward the cap 10), the stem 7a is pushed down together with the head 12 (the stem 7a advances toward the cap 10 along the central axis O). Also, as the stem 7a is pushed down, the bottom 5b also descends via the connecting cylinder 5a, so that the liquid-tight contact between the annular portion 5d and the lower part of the inner sliding piece 6c is released. When the head 12 is further pushed down, the piston 6 also descends together with the cylindrical member 7 and the inner member 5, and the inside of the cylinder 1 is pressurized. For this reason, the content liquid in the cylinder 1 passes through the communication port 5c and is discharged to the outside from the discharge port 12d through the inside of the connecting cylinder 5a, the stem 7a, the passage provided inside the cylindrical portion 12a, the top portion 12b, and the nozzle 12c. When the head 12 is pressed and the piston 6 descends below the vent hole 1f, the container (not shown) communicates with the outside via the vent hole 1f. Thereby, even if the content liquid stored in the container decreases, the inside of the container is not depressurized, and the problem that the container is deformed so as to be crushed is prevented.

[0036] Also, when the head 12 is pushed down, the contact portion 12f of the extending portion 12e that contacts the elastic piece 10e applies a pressing force to the elastic piece 10e. Therefore, as shown in FIG. 5, the elastic piece 10e bends radially inward. The reinforcing rib 10g of the present embodiment has a rib creep portion 10k (see FIG. 6), and the thickness of the reinforcing rib 10g gradually changes toward the rib root portion 10j. Therefore, when a pressing force is applied to the head 12, the resistance force does not suddenly change, and the operability is excellent.

[0037] As shown in FIG. 2, the radius of curvature Ra of the arc-shaped outer peripheral portion 10h of the elastic piece 10e is set to be smaller than the radius of curvature Rb of the arc-shaped inner peripheral portion 12g. That is, compared with the case where the radius of curvature Ra and the radius of curvature Rb are equal, the contact area between the contact portion 12f and the elastic piece 10e decreases, and the sliding resistance when the head 12 is pushed down becomes smaller. Therefore, an excessive force is not required when pressing the head 12.

[0038] Thereafter, when the pressing force on the head 12 is released, the elastic force of the elastically deformed elastic piece 10e acts on the head 12, and the head 12 begins to rise. Along with this, as the lower part protruding radially outward in the connecting cylinder 5a and the lower part of the inner sliding piece 6c come into liquid-tight contact again, the piston 6 rises together with the inner member 5, so the inside of the cylinder 1 is decompressed. As a result, the valve body portion 2b separates from the bottom wall portion 1a and the suction port 1d is opened, allowing the content liquid in the container to be sucked into the cylinder 1 through the pipe 4.

[0039] As described above, according to the pump-type discharger 100 of the present embodiment, the head 12 after discharging the content liquid can be returned without using a metal coil spring, and it can be used in the same manner as a conventional pump-type discharger.

[0040] Regarding the sagging of the elastic piece 10e described above, the inventor repeated studies and found that the influence of sagging can be suppressed by appropriately setting the elastic piece 10e and the extending portion 12e. This will be described in detail with reference to FIGS. 4 and 6.

[0041] In FIG. 4, the virtual line indicates the extending portion 12e in a state where the head 12 has moved to the upper limit (retracted limit). Here, let the length in the vertical direction (front-rear direction) from the base end side end portion of the reinforcing rib 10g (the connecting portion between the reinforcing rib 10g and the top wall 10a) to the tip side end portion 12h of the extending portion 12e be L. Also, in FIG. 4, the length in the front-rear direction from the base end side end portion of the reinforcing rib 10g (the connecting portion between the reinforcing rib 10g and the top wall 10a) to the tip side end portion 10p of the rib base portion 10j in a state where the elastic piece 10e and the extending portion 12e are non-contact before combining the cap 10 and the head 12 is indicated by a solid line and is denoted as L1. Here, it has been found that setting the elastic piece 10e and the extending portion 12e as in the following formula (1) is effective in suppressing the influence of sagging. 0.3×L≦L1≦0.6×L···(1) In this embodiment, L1 is set to 0.4×L, and it has been found that this setting is particularly effective in suppressing sagging.

[0042] And as shown in FIG. 6, when the head 12 is moved to the lower limit (forward limit), it has been found that the tip-side end portion 10p of the rib base portion 10j is at the same position as the contact portion 12f with the elastic piece 10e in the extension portion 12e in the front-rear direction, or is located on the base side of the reinforcing rib 10g with respect to the contact portion 12f (lower side with respect to the contact portion 12f), which is effective in suppressing the influence of sagging.

[0043] As described above, one embodiment of the present invention has been described. However, the present invention is not limited to such a specific embodiment, and various modifications and changes are possible within the scope of the gist of the present invention described in the claims, unless otherwise particularly limited in the above description. For example, the configuration of the above-described embodiment can be appropriately added or deleted, and the configuration of one embodiment can also be provided in another embodiment. Also, the effects in the above-described embodiment are merely examples of the effects resulting from the present invention, and it does not mean that the effects of the present invention are limited to the above effects.

[0044] For example, the pump described above is an example, and the present invention also includes cases where other types of pumps are adopted. Also, the number of elastic pieces 10e and the positions where they are provided are not limited to those in the above-described embodiment and can be appropriately changed. Also, the number of reinforcing ribs 10g and the positions where they are provided are not limited to those in the above-described embodiment and can be appropriately changed. Further, the reinforcing rib 10g may be such that the tip-side end portion 10p of the rib base portion 10j is connected to the inner peripheral surface of the elastic piece body 10f without providing the rib tip portion 10m. And the outer peripheral surface of the elastic piece body 10f is not limited to being arcuate in plan view as in this embodiment, and may be, for example, linear in plan view. Also, the extension portion 12e is not limited to being cylindrical and may be, for example, rectangular tubular.

[0045] Also, although the elastic piece 10e of the present embodiment bends in a direction approaching the central axis O, it may bend in a direction away from the central axis O. And in the present embodiment, the elastic piece 10e is provided on the cap 10 and the extending portion 12e is provided on the head 12, but the extending portion 12e may be provided on the cap 10 and the elastic piece 10e may be provided on the head 12.

Explanation of Signs

[0046] 1: Cylinder 1a: Bottom wall portion 1b: Cylindrical wall portion 1c: Flange wall 1d: Suction port 1e: Holding cylinder 1f: Vent hole 2: Valve member 2a: Base portion 2b: Valve body portion 2c: Connecting piece 4: Pipe 5: Inner member 5a: Connecting cylinder 5b: Bottom portion 5c: Communication port 5d: Annular portion 6: Piston 6a: Base portion 6b: Outer sliding piece 6c: Inner sliding piece 7: Cylindrical member 7a: Stem 7b: Diameter-expanded portion 8: Holder 8a: Holder base portion 8b: Flange 9: Packing 10: Cap 10a: Top wall 10b: Peripheral wall 10c: Female thread portion 10d: Anti-rotation recess 10e: Elastic piece 10f: Elastic piece body 10g: Reinforcing rib 10h: Arc-shaped outer peripheral portion 10j: Rib root portion 10k: Rib creep portion 10m: Rib tip portion 10n: Root-side end of the reinforcing rib 10p: Tip-side end of the rib root part 10q: Tip-side end of the rib creep part 10r: Tip-side end of the rib tip part 10s: Tip-side end of the reinforcing rib 11: Cover 11a: Cover peripheral wall 11b: Anti-disengagement convex part 11c: Rib 11d: Inward flange 12: Head 12a: Cylindrical part 12b: Top part 12c: Nozzle 12d: Discharge port 12e: Extension part 12f: Contact part 12g: Arc-shaped inner peripheral part 12h: Tip-side end 100: Pump-type discharger O: Central axis

Claims

1. A pump-type dispenser comprising: a cap attached to the mouth of a container for containing a content liquid; a pump held at the mouth by the cap and driven by the forward and backward movement of a stem; and a head having a discharge port for discharging the content liquid to the outside and connected to the stem, wherein the content liquid in the container is discharged from the discharge port by moving the head toward the cap. Either the head or the cap is provided with an extension extending toward the other of the head and the cap. The other of the head and the cap is provided with an elastic piece that is bent by the extension when the head is advanced toward the cap. The elastic piece includes an elastic piece body and a reinforcing rib that is narrower in width than the elastic piece body. The reinforcing rib has a rib root portion located on the root side of the reinforcing rib and a rib gradually changing portion whose thickness gradually decreases from the rib root portion toward the tip side of the reinforcing rib. A pump-type dispenser.

2. The pump-type dispenser according to claim 1, wherein, in a state where the head has moved to the forward limit, the tip-side end portion of the rib root portion is at the same position in the front-rear direction as the contact portion of the extension with the elastic piece or is located on the root side of the reinforcing rib.

3. Let the length in the front-rear direction from the root-side end portion of the reinforcing rib to the tip-side end portion of the extension in a state where the head has moved to the rear limit be L, and let the length in the front-rear direction from the root-side end portion of the reinforcing rib to the tip-side end portion of the rib root portion in a state where the elastic piece and the extension are not in contact before combining the head and the cap be L1. The pump-type dispenser according to claim 1, which satisfies the following formula (1). 0.3×L ≤ L1 ≤ 0.6×L... (1)

4. The extension has an arcuate inner peripheral portion that contacts the elastic piece and bends the elastic piece. The elastic piece has an arcuate outer peripheral portion that contacts the arcuate inner peripheral portion. The pump-type dispenser according to claim 1, wherein the radius of curvature of the arcuate outer peripheral portion is smaller than the radius of curvature of the arcuate inner peripheral portion.

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