Pump expeller

Abstract

The present application provides a pump-type ejector capable of ejecting a content liquid as in the past and further excellent in recycling. A pump-type ejector (100) includes a pump driven by a rod (7a) to move in and out, and a head (12) having a discharge port (12d) and coupled to the rod (7a), either one of the head (12) and a cover (10) is provided with an extension (12e) extending toward the other one of the head (12) and the cover (10), the other one of the head (12) and the cover (10) is provided with an elastic piece (10e), the elastic piece (10e) is deflected by the extension (12e) when the head (12) is advanced toward the cover (10), the elastic piece (10e) includes an elastic piece main body (10f) and a reinforcing rib (10g), the reinforcing rib (10g) has a rib root (10j) and a rib tapering portion (10k).

Description

Technical Field

[0001] This invention relates to a pump-type discharge device. Background Technology

[0002] As a pump-type discharge device, there is a known pump-type discharge device that includes a cover installed at the mouth of a container, a pump that is held at the mouth by the cover and driven by the forward and backward movement of a rod, and a head connected to the rod, which discharges the contents of the container from the discharge port of the head by moving the head toward the cover (see, for example, Patent Document 1).

[0003] Inside this type of pump-type discharger, as shown in Patent Document 1, a helical spring is provided to return the head to its initial position after it has moved toward the cover.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2011-31950 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] However, while most components of this type of pump-type ejector are made of synthetic resin, the helical spring is made of metal. Therefore, if left in its original state after use, it cannot be recycled as a resin product. Furthermore, in this type of pump-type ejector, components are typically securely fastened together, for example, through interlocking, to prevent them from falling off during normal use. Therefore, disassembling the pump-type ejector and sorting it into helical springs and other components requires considerable time.

[0009] The subject of this invention is to solve this problem, and the objective is to provide a pump-type discharger that can discharge the contents in the same way as before, and thus has excellent recyclability.

[0010] Technical means to solve the problem

[0011] This invention relates to a pump-type discharge device, comprising: a cover disposed at the opening of a container containing liquid contents; a pump held at the opening by the cover and driven by a rod that moves back and forth; and a head having an outlet for discharging the liquid contents to the outside and connected to the rod, wherein the liquid contents of the container are discharged from the outlet by moving the head toward the cover. In this pump-type discharge device,

[0012] Either the head or the cover is provided with an extension that extends toward the other of the head and the cover.

[0013] An elastic sheet is provided in either the head or the cover, which flexes through the extension when the head is moved toward the cover.

[0014] The elastic sheet includes an elastic sheet body and reinforcing ribs that are narrower than the elastic sheet body.

[0015] The reinforcing rib has: a rib root located on the root side of the reinforcing rib; and a rib tapering portion that gradually thins from the rib root toward the front end side of the reinforcing rib. Furthermore, the gradually thinning rib tapering portion in this specification is not limited to cases where the thickness changes along a single straight line or curve, but also includes cases where the thickness changes in stages (stepwise).

[0016] Preferably, when the head has moved to its forward limit, the front end of the rib root is located at the same position in the front-rear direction relative to the contact portion with the elastic sheet in the extension portion, or is located at the root side of the reinforcing rib.

[0017] Preferably, when the length in the front-rear direction from the root end of the reinforcing rib to the front end of the extension is set to L when the head is moved to the rearward limit, and the length in the front-rear direction from the root end of the reinforcing rib to the front end of the rib root is set to L1 when the elastic sheet and the extension are not in contact before the head and the cover are combined, the following formula (1) is satisfied.

[0018] 0.3×L≦L1≦0.6×L (1)

[0019] Preferably, the extended portion has an arc-shaped inner periphery that contacts the elastic sheet and causes the elastic sheet to flex.

[0020] The elastic sheet has an arc-shaped outer periphery that contacts the arc-shaped inner periphery.

[0021] The radius of curvature of the outer arc-shaped periphery is smaller than the radius of curvature of the inner arc-shaped periphery.

[0022] The effects of the invention

[0023] According to the pump-type ejector of the present invention, when the head is moved toward the cover, the elastic sheet flexes through the extension, thus allowing the head to return to its initial position when the flexed elastic sheet recovers. However, if the flexibly deformable elastic sheet is frequently flexed with a large force, permanent strain may occur, resulting in reduced resilience. In contrast, the elastic sheet of the present invention includes an elastic sheet body and a reinforcing rib, the reinforcing rib including: a rib root located on the root side; and a rib tapering portion, the thickness of which gradually decreases from the rib root toward the front end side of the reinforcing rib. That is, the thickness of the elastic sheet increases at the root side of the rib, while the thickness of the front end side of the elastic sheet decreases compared to the root side. Therefore, in the state before the head is operated (the state where the head has moved to the retraction limit and the extension contacts the front end side of the elastic sheet), the front end side of the elastic sheet is prone to flexing, while the root side of the elastic sheet is not prone to flexing. Therefore, by adjusting the wall thickness at the root of the elastic sheet, the elastic force for resetting the head after discharging the contents is primarily manifested at the root of the elastic sheet, thus enabling a pump-type ejector that is less susceptible to permanent strain. Furthermore, when the head has moved to its retraction limit and the extended portion contacts the front end of the elastic sheet, the force acting on the front end of the elastic sheet is reduced because no pressure is applied to the head. Therefore, the front end of the elastic sheet, which remains in a flexed state before operation on the head, also mitigates the effects of permanent strain. Additionally, because the reinforcing ribs have a rib gradient, the resistance does not change drastically when pressure is applied to the head, resulting in excellent operability.

[0024] Furthermore, since the pump-type discharger according to the present invention uses such an elastic sheet instead of a metal helical spring, there is no need to sort the metal parts when discarding, as is the case with conventional pump-type dischargers, and it can be reused as a resin product, thus exhibiting excellent recyclability. Attached Figure Description

[0025] [ Figure 1 [Illustration 1] is a side cross-sectional view showing the state of the elastic sheet before deflection in one embodiment of the pump-type discharger of the present invention.

[0026] [ Figure 2 [It is about] Figure 1 A three-dimensional view of the periphery of the elastic sheet shown.

[0027] [ Figure 3 [This is a bird's-eye view] Figure 1 The diagram shows the elastic sheet.

[0028] [ Figure 4 ] is along Figure 3 A cross-sectional view of AA.

[0029] [ Figure 5 [It is about] Figure 1The pump-type ejector shown is a side cross-sectional view with the head pressed.

[0030] [ Figure 6 [It is about] Figure 5 A magnified view of the periphery of the elastic sheet shown. Detailed Implementation

[0031] Hereinafter, a pump-type discharger 100, which is an embodiment of the pump-type discharger of the present invention, will be described with reference to the accompanying drawings. In this specification, the term "up-down direction" refers to the direction along the central axis O (the central axis of the rod 7a described later), with the side where the tube 4 is located designated "down" and the side where the head 12 is located designated "up". Furthermore, in this specification, the action of the head 12 being pressed and moving downwards is described as the head 12 advancing, and the action of the head 12 returning upwards after being pressed is described as the head 12 retracting. Therefore, in the following description, the up-down direction as described above will sometimes be referred to as the front-back direction. Additionally, the term "radial" refers to the direction orthogonal to the central axis O in a plane perpendicular to the central axis O, and the term "circumferential" refers to the direction surrounding the central axis O in the plane.

[0032] The pump-type dispensing device 100 of this embodiment is used by being installed at the mouth of a bottle-shaped container (not shown). The liquid contents dispensed by the pump-type dispensing device 100 are, for example, cosmetics (such as lotion or toner), shampoo, shower gel, hand soap, facial cleanser, etc.

[0033] The pump-type discharger 100 includes: a cylinder 1, a valve component 2, a pipe 4, an internal component 5, a piston 6, a cylindrical component 7, a retainer 8, a gasket 9, a cover 10, an outer cover 11, and a head 12. Here, the cylinder 1, valve component 2, internal component 5, piston 6, cylindrical component 7, and retainer 8 are components constituting the "pump" in this specification, etc. Furthermore, among the components, the valve component 2, piston 6, and gasket 9 are formed of a flexible, soft synthetic resin (e.g., polyethylene (low-density polyethylene, LDPE, high-density polyethylene, HDPE, polyethylene, PE)), while the other components are formed of a rigid synthetic resin (e.g., polypropylene (PP), polybutylene terephthalate (PBT), polyacetal (POM), polyketone (POK), etc.). Furthermore, the components constituting the pump-type discharger 100 are basically shaped with the central axis O as the center.

[0034] Cylinder 1 includes: a bottom wall portion 1a that is circular and protrudes upward from its center; a cylindrical cylindrical wall portion 1b that rises from the outer edge of the bottom wall portion 1a; and a flange wall 1c that extends radially outward from the upper part of the cylindrical wall portion 1b. A through hole (inlet 1d) is provided at the protruding central portion of the bottom wall portion 1a. Furthermore, a cylindrical retaining sleeve 1e is provided on the lower surface of the bottom wall portion 1a, which surrounds the inlet 1d, extends downward, and retains the pipe 4. Moreover, a through hole (vent 1f) is provided in the cylindrical wall portion 1b.

[0035] The valve component 2 includes: a base 2a, a valve body 2b that covers the intake port 1d inside the base 2a and sits on the upper surface of the bottom wall 1a, and a connecting piece 2c that connects the base 2a and the valve body 2b and is elastically deformable. The valve component 2 functions as a one-way valve. When the cylinder 1 is in a depressurized state, the valve body 2b, which closes the intake port 1d, separates from the bottom wall 1a, thereby allowing the intake port 1d to open.

[0036] In this embodiment, the base 2a is shaped like a covered cylinder with its upper surface protruding upwards from the center, and includes an opening (not shown) for the contents of the suction port 1d to pass through. The base 2a is fitted and held on the inner circumferential surface of the cylinder wall portion 1b, thereby holding the valve member 2 within the cylinder 1.

[0037] The tube 4 is hollow, and its upper end is inserted into and held in the retaining cylinder 1e.

[0038] The internal component 5 is disposed inside the cylinder 1 and is a component that moves vertically relative to the cylinder 1. The internal component 5 includes: a cylindrical connecting cylinder 5a and a bottom 5b that closes the lower end of the connecting cylinder 5a and extends radially outward. In addition, a hole (connecting port 5c) is provided through the connecting cylinder 5a, and an annular portion 5d is provided on the upper surface of the bottom 5b, which is located radially outward than the connecting portion with the connecting cylinder 5a.

[0039] The piston 6 is inserted through the connecting cylinder 5a and disposed inside the cylinder 1. In this embodiment, the piston 6 includes an annular base 6a. An outer sliding plate 6b extending upwards and downwards from the base 6a is provided at the outer edge of the base 6a. The outer sliding plate 6b is liquid-tightly abutted against the inner circumferential surface of the cylinder wall portion 1b in a slidable manner. Furthermore, an inner sliding plate 6c extending upwards and downwards from the base 6a is provided at the inner edge of the base 6a. The lower part of the inner sliding plate 6c is liquid-tightly abutted against a radially outwardly protruding lower part in the connecting cylinder 5a, and the upper part of the inner sliding plate 6c is liquid-tightly abutted against the inner circumferential surface of the expanded diameter portion 7b in the cylindrical member 7 (described later) in a slidable manner.

[0040] The cylindrical member 7 is a member that is integrally cylindrical. The cylindrical member 7 includes: a cylindrical rod 7a, and an enlarged diameter portion 7b connected to the lower end of the rod 7a and having a larger diameter than the rod 7a. When the connecting cylinder 5a is inserted into the rod 7a, the two fit together, so the internal member 5 and the cylindrical member 7 move integrally with respect to the cylinder 1.

[0041] The retainer 8 includes a retainer base 8a, which has a portion located radially outward of the rod 7a and a portion located radially outward of the enlarged diameter portion 7b, and is fitted and held on the inner circumferential surface of the cylindrical wall portion 1b. A flange 8b extending radially outward is provided at the upper end of the retainer base 8a. The retainer 8 prevents the internal components 5, piston 6, and cylindrical component 7 from dislodging from the cylinder 1.

[0042] The gasket 9 is annular in shape, inserted through and fitted into the cylinder wall 1b of the cylinder 1. When the pump-type discharger 100 is installed in a container (not shown), the gasket 9 is held between the container opening and the flange wall 1c. This prevents adverse conditions such as leakage of contents from the opening when the container is tilted.

[0043] The cover 10 includes a top wall 10a that is circular and has a through hole in the center. A cylindrical peripheral wall 10b extending downwards is provided at the outer edge of the top wall 10a. The upper part of the inner peripheral surface of the peripheral wall 10b bulges radially inwards to fit and hold the flange wall 1c, thereby holding the cylinder 1 in the cover 10. Furthermore, an internal thread portion 10c is provided on the inner peripheral surface of the cover 10, which engages with an external thread portion provided at the opening of the container. By engaging the external thread portion with the internal thread portion 10c, the cover 10 can be installed in the container. Moreover, on the outer peripheral surface of the peripheral wall 10b, such as… Figure 1 As shown in the enlarged view, anti-rotation recesses 10d extending in the vertical direction are provided. Multiple anti-rotation recesses 10d are provided at intervals in the circumferential direction.

[0044] Additionally, the cover 10 includes an elastic sheet 10e extending upward from the upper surface of the top wall 10a and capable of elastically deforming radially inward (see reference). Figure 2 , Figure 3 , Figure 4 ).also, Figure 3 , Figure 4 The solid line in the diagram represents the elastic sheet 10e in its state before bending (the elastic sheet 10e and the extension portion 12e described later are not in contact before the cover 10 and the head 12 are combined). In this embodiment, a total of 6 elastic sheets 10e are provided at equal intervals in the circumferential direction. As described later, the elastic sheet 10e is elastically deformed by the head 12 being pressed when the contents are discharged, and the head 12 is returned to its original position by restoring force when the pressure on the head 12 is released.

[0045] The elastic sheet 10e includes: a plate-shaped elastic sheet body 10f, and reinforcing ribs 10g that are narrower than the elastic sheet body 10f (and shorter in circumferential length than the elastic sheet body 10f). The reinforcing ribs 10g are respectively disposed at both circumferential ends of the elastic sheet body 10f. The elastic sheet body 10f of this embodiment is as follows... Figure 3 The figure shows an arc-shaped outer periphery 10h with a radius of curvature of Ra.

[0046] like Figure 4 As shown, the reinforcing rib 10g includes: a rib root portion 10j located at the root side of the reinforcing rib 10g; a rib tapering portion 10k, whose thickness gradually decreases from the rib root portion 10j toward the front end side of the reinforcing rib 10g; and a rib front end portion 10m extending from the rib tapering portion 10k toward the front end side of the reinforcing rib 10g. As shown, the thickness (radial length) of the rib root portion 10j is approximately constant from the root end portion 10n of the reinforcing rib 10g to the front end portion 10p of the rib root portion 10j, and is approximately the same as the thickness of the elastic sheet body 10f. Regarding the rib tapering portion 10k, as... Figure 4 As shown, the rib extends in a slightly curved manner, with its thickness gradually decreasing from the front end 10p of the rib root portion 10j to the front end 10q of the rib transition portion 10k. Furthermore, the rib front end portion 10m extends with a substantially constant thickness from the front end 10q of the rib transition portion 10k to the front end 10r of the rib front end portion 10m. Additionally, the front end 10r of the rib front end portion 10m is located further towards the root than the front end 10s of the reinforcing rib 10g.

[0047] However, if a flexible sheet capable of bending is frequently bent with a large force, permanent strain may occur, leading to reduced resilience. To address this problem, in this embodiment, the root side of the elastic sheet 10e is thickened by the rib root 10j, while the front end side is thinner than the root side. Therefore, the front end side of the elastic sheet 10e is more prone to bending, while the root side is less prone to bending, thus suppressing permanent strain on the root side of the elastic sheet 10e. Furthermore, in the elastic sheet 10e of this embodiment, the elastic force for resetting the head 12 is adjusted so that it is primarily manifested on the root side of the elastic sheet 10e, including the thickness of the rib root 10j.

[0048] The outer cover 11 includes a cylindrical outer cover peripheral wall 11a. The outer cover peripheral wall 11a surrounds the peripheral wall 10b and the elastic sheet 10e. An anti-detachment protrusion 11b is provided at the lower end of the outer cover peripheral wall 11a, protruding radially inward and engaging with the lower end of the peripheral wall 10b. A rib 11c extending vertically is provided on the inner circumferential surface of the outer cover peripheral wall 11a. The lower part of the rib 11c engages with the anti-rotation recess 10d, and the outer cover 11 is held in a non-rotating manner in the cover 10. The upper part of the rib 11c protrudes radially inward more than the lower part. Moreover, the lower end face of its upper part contacts the upper surface of the top wall 10a, and as described above, the anti-detachment protrusion 11b engages with the lower end of the peripheral wall 10b, thereby holding the outer cover 11 in a non-detaching manner in the cover 10. An inward flange 11d extending radially inward is provided at the upper end of the outer cover peripheral wall 11a.

[0049] The head 12 includes a cylindrical portion 12a, which is cylindrical in shape, with a rod 7a inserted into and held in place inside. A top 12b is provided at the upper part of the cylindrical portion 12a, with its upper surface recessed downwards and having an internal passage leading to the cylindrical portion 12a. A nozzle 12c is provided at the top 12b, which is cylindrical in shape and extends radially outwards, leading to the internal passage of the top 12b. An outlet 12d is provided at the front end of the nozzle 12c for discharging the contents through a pump-type discharger 100.

[0050] Additionally, the head 12 includes an extension 12e extending downward from the top 12b and the nozzle 12c. In this embodiment, the extension 12e is cylindrical with the central axis O as its center. Furthermore, the lower part of the extension 12e is as follows... Figure 1 As shown, the portion slopes outward in a radial direction, generally extending downwards, and the inner edge of the sloped portion contacts the outer peripheral surface of the elastic sheet 10e (elastic sheet body 10f). Here, the portion of the extension 12e that contacts the elastic sheet 10e is referred to as the contact portion 12f. Furthermore, as... Figure 3 As shown, the inner circumferential surface of the extension 12e with the contact portion 12f is referred to as the arc-shaped inner circumferential portion 12g, and the radius of curvature of the arc-shaped inner circumferential portion 12g is referred to as Rb. In this embodiment, the radius of curvature Ra of the arc-shaped outer circumferential portion 10h in the elastic sheet 10e is set to be smaller than the radius of curvature Rb of the arc-shaped inner circumferential portion 12g.

[0051] Pump-type discharger 100 constructed from such components, such as Figure 1 As shown, in the state before the pressing head 12, the contact portion 12f of the extension portion 12e contacts the elastic sheet 10e, and the head 12 is in a state where it has moved to the upward limit (backward limit). In the elastic sheet 10e of this embodiment, the thickness on the root side is increased by the rib root portion 10j included in the reinforcing rib 10g, while the thickness on the front end side is thinner than that on the root side. Therefore, in the state before the pressing head 12, as Figure 1 As shown, the front end side of the elastic sheet 10e flexes, while the root side of the elastic sheet 10e becomes less prone to flexing. As described above, in the elastic sheet 10e of this embodiment, the elastic force for resetting the head 12 is adjusted so that it is mainly manifested at the root side of the elastic sheet 10e, including the thickness of the rib root 10j. Therefore, the effect of permanent strain can be suppressed while ensuring the function of resetting the head 12. Furthermore, when the head 12 has moved to its upper limit, the force acting on the front end side of the elastic sheet 10e before pressing the head 12 is small, thus mitigating the effect of permanent strain. Figure 1 The effect of permanent strain at the front end of the elastic sheet 10e that remains in a flexed state.

[0052] Then, when the head 12 is pressed down from above (moving the head 12 toward the cover 10), the rod 7a is pressed down together with the head 12 (the rod 7a moves toward the cover 10 along the central axis O). Additionally, as the rod 7a is pressed down, the bottom 5b also descends via the connecting cylinder 5a, thus releasing the liquid-tight contact between the annular portion 5d and the lower part of the inner sliding plate 6c. Then, when the head 12 is pressed down further, the piston 6 also descends together with the cylindrical member 7 and the internal member 5, pressurizing the interior of the cylinder 1. Therefore, the liquid contents inside the cylinder 1 are discharged to the outside through the connecting port 5c, through the passages provided inside the connecting cylinder 5a, the rod 7a, the cylindrical portion 12a, and the top 12b, and the inside of the nozzle 12c, and from the discharge port 12d. Furthermore, when the head 12 lowers the piston 6 below the vent 1f, a container (not shown) communicates with the outside via the vent 1f. Therefore, even if the liquid contents contained in the container decrease, the container will not become negatively pressurized, thus preventing the container from deforming as if it were flattened.

[0053] Furthermore, when the head 12 is pressed down, the contact portion 12f of the extension 12e that contacts the elastic sheet 10e applies a pressing force to the elastic sheet 10e, therefore, as Figure 5 The elastic sheet 10e shown flexes radially inward. The reinforcing rib 10g of this embodiment has a rib transition portion 10k (see reference). Figure 6 The thickness of the reinforcing rib 10g gradually changes towards the rib root 10j, so the resistance does not change drastically when pressing pressure is applied to the head 12, resulting in excellent operability.

[0054] like Figure 2 As shown, the radius of curvature Ra of the arc-shaped outer periphery 10h in the elastic sheet 10e is set to be smaller than the radius of curvature Rb of the arc-shaped inner periphery 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 sheet 10e is reduced, the sliding resistance when the head 12 is pressed down is reduced, and therefore excessive force is not required when pressing the head 12.

[0055] Subsequently, when the pressure on head 12 is released, the elastic force of the elastically deformed elastic plate 10e acts on head 12, causing head 12 to rise. Simultaneously, the lower part of the connecting cylinder 5a, protruding radially outward, re-liquidally abuts against the lower part of the inner sliding plate 6c, while the piston 6 and the internal component 5 rise together, thus depressurizing the interior of cylinder 1. As a result, valve body 2b separates from bottom wall 1a, and suction port 1d is opened, allowing the contents of the container to be drawn into cylinder 1 via pipe 4.

[0056] Thus, according to this embodiment, the pump-type ejector 100 can reset the head 12 after the contents have been discharged, even without using a metal helical spring, and can be used in the same way as conventional pump-type ejectors.

[0057] Regarding the permanent strain of the elastic sheet 10e, the inventors conducted repeated studies and confirmed that the effect of permanent strain can be suppressed by appropriately setting the elastic sheet 10e and the extension portion 12e. For this, see [reference needed]. Figure 4 , Figure 6 A detailed explanation will be provided.

[0058] exist Figure 4 In the diagram, the imaginary line represents the extension 12e when the head 12 has moved to its upward limit (reverse limit). Here, the length in the vertical (front-back) direction from the root end of the reinforcing rib 10g (the connection between the reinforcing rib 10g and the top wall 10a) to the front end 12h of the extension 12e is defined as L. Furthermore, the... Figure 4 The length L1, as indicated by the solid line, is the length in the front-rear direction from the root end of the reinforcing rib 10g (the connection between the reinforcing rib 10g and the top wall 10a) to the front end 10p of the rib root 10j, in a non-contact state between the elastic sheet 10e and the extension 12e before the combined cover 10 and the head 12. Here, it is confirmed that setting the elastic sheet 10e and the extension 12e as described in the following formula (1) is effective in suppressing the effects of permanent strain.

[0059] 0.3×L≦L1≦0.6×L (1)

[0060] Furthermore, in this embodiment, L1 is set to 0.4 × L, and it has been confirmed that this setting is particularly effective in suppressing permanent strain.

[0061] Moreover, as Figure 6As shown, it has been confirmed that when the head 12 moves to the lower limit (forward limit), the front end 10p of the rib root 10j is located at the same position in the front-rear direction relative to the contact portion 12f of the elastic sheet 10e in the extension 12e, or is located at the root side of the reinforcing rib 10g (lower side relative to the contact portion 12f) relative to the contact portion 12f, which is effective in suppressing the effect of permanent strain.

[0062] The present invention has been described above as an embodiment, but the present invention is not limited to this specific embodiment. Various modifications and alterations can be made within the scope of the spirit of the invention as set forth in the claims, unless otherwise specified in the description. For example, the structure of the embodiment can be appropriately added to or deleted from, and the structure of one embodiment can be incorporated into other embodiments. Furthermore, the effects described in the embodiments are merely illustrative of the effects produced by the present invention and do not imply that the effects of the present invention are limited to those described.

[0063] For example, the pump described above is one example; other types of pumps are also included in this invention. Furthermore, the number or position of the elastic sheets 10e is not limited to the described embodiment and can be appropriately varied. Similarly, the number or position of the reinforcing ribs 10g is not limited to the described embodiment and can be appropriately varied. Moreover, the reinforcing ribs 10g may not have a front end 10m; instead, the front end 10p of the rib root 10j may be connected to the inner peripheral surface of the elastic sheet body 10f. Furthermore, the outer peripheral surface of the elastic sheet body 10f is not limited to an arc shape when viewed from above as in this embodiment; for example, it may be a straight line when viewed from above. Additionally, the extension 12e is not limited to a cylindrical shape; for example, it may be a square tube shape.

[0064] Furthermore, in this embodiment, the elastic sheet 10e flexes towards the direction close to the central axis O, but it can also flex away from the central axis O. Moreover, in this embodiment, the elastic sheet 10e is provided on the cover 10 and the extension portion 12e is provided on the head 12, but it is also possible to provide the extension portion 12e on the cover 10 and the elastic sheet 10e on the head 12.

[0065] Explanation of icon numbers

[0066] 1: Cylinder

[0067] 1a: Bottom wall

[0068] 1b: Cylinder wall section

[0069] 1c: Flange wall

[0070] 1d: Inhalation port

[0071] 1e: Retaining tube

[0072] 1f: Vent

[0073] 2: Valve components

[0074] 2a: Base

[0075] 2b: Valve body section

[0076] 2c: Connector

[0077] 4: pipe

[0078] 5: Internal components

[0079] 5a: Connecting cylinder

[0080] 5b: Bottom

[0081] 5c: Connector

[0082] 5d: Annular portion

[0083] 6: Piston

[0084] 6a: Base

[0085] 6b: Outer sliding plate

[0086] 6c: Inner sliding plate

[0087] 7: Cylindrical components

[0088] 7a: Rod

[0089] 7b: Expanded diameter section

[0090] 8: Retainer

[0091] 8a: Retainer base

[0092] 8b: Flange

[0093] 9: Padding

[0094] 10: Cover

[0095] 10a: Top wall

[0096] 10b: Zhoubi

[0097] 10c: Internal thread section

[0098] 10d: Anti-rotation recess

[0099] 10e: Elastic sheet

[0100] 10f: Elastic sheet body

[0101] 10g: Reinforcing Ribs

[0102] 10h: Arc-shaped outer periphery

[0103] 10j: Root of ribs

[0104] 10k: Rib Gradient

[0105] 10m: Anterior end of the rib

[0106] 10n: The root side end of the reinforcing rib

[0107] 10p: The anterior end of the rib root

[0108] 10q: Front end of the rib gradient

[0109] 10r: The front end of the rib's front end

[0110] 10s: The front end of the reinforcing rib

[0111] 11: Outer Cover

[0112] 11a: Outer casing perimeter wall

[0113] 11b: Anti-falling convex part

[0114] 11c: Rib

[0115] 11d: Inward flange

[0116] 12: Head

[0117] 12a: Cylindrical part

[0118] 12b: Top

[0119] 12c: Nozzle

[0120] 12d: Discharge outlet

[0121] 12e: Extension

[0122] 12f: Contact part

[0123] 12g: Arc-shaped inner circumference

[0124] 12h: Front end

[0125] 100: Pump-type discharger

[0126] O: Central axis

Claims

1. A pump expeller comprising: A cap, installed at the mouth of a container that holds liquid contents; The pump is driven by the cap being held at the opening and moved forward and backward by a rod; And a head, having a discharge port for discharging the contents to the outside and connected to the rod, wherein the contents of the container are discharged from the discharge port by moving the head toward the cap, in the pump-type discharge device, Either the head or the cover is provided with an extension that extends toward the other of the head and the cover. An elastic sheet is provided on either the head or the cover, and the elastic sheet flexes through the extension when the head is moved toward the cover. The elastic sheet includes an elastic sheet body and reinforcing ribs that are narrower than the elastic sheet body. The reinforcing rib has: a rib root portion located on the root side of the reinforcing rib; and a rib tapering portion, which gradually thins from the rib root portion toward the front end side of the reinforcing rib.

2. The pump ejector of claim 1, wherein, When the head has moved to its forward limit, the front end of the rib root is located at the same position in the front-rear direction relative to the contact portion with the elastic sheet in the extension portion, or at the root side of the reinforcing rib.

3. The pump ejector of claim 1, wherein, When the head is moved to the rearward limit, the length in the front-rear direction from the root side end of the reinforcing rib to the front end side end of the extension is set to L. When the elastic sheet and the extension are not in contact before the head and the cover are combined, the length in the front-rear direction from the root side end of the reinforcing rib to the front end side end of the rib root is set to L1. The following formula (1) is satisfied. 0.3 x L < L1 < 0.6 x L (1).

4. The pump-type discharger according to claim 1, wherein, The extended portion has an arc-shaped inner periphery that contacts the elastic sheet and causes the elastic sheet to flex. The elastic sheet has an arc-shaped outer periphery that contacts the arc-shaped inner periphery. The radius of curvature of the outer arc-shaped periphery is smaller than the radius of curvature of the inner arc-shaped periphery.

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