Ejector

Abstract

The present invention provides a new discharge device that can reduce the downward force of the lifting member used to operate the pump while ensuring a seal between the piston seal and the sliding surface of the cylinder member. [Solution] The discharge device 2 comprises a mounting cap 5, a cylinder member 6 having a sliding surface 6b1, a piston 7 that slides vertically on the sliding surface 6b1, a pump chamber 8, and a lifting member 9 that sends the contents 4 from inside the container 3 to the discharge port 9a1 for discharge. The piston 7 has a lower seal portion 7a that is inclined radially outward toward downward, and an upper seal portion 7b that extends upward and contacts the cylinder member 6 at least at the top dead center of the lifting member 9. The lower seal portion 7a has a bent portion 7a3 which is a change position where the inclination angle changes discontinuously. The radial outward inclination angle is larger below the bent portion 7a3 than above, and a first recess 7a1 is provided on the radial inner surface of the lower seal portion 7a that overlaps with the bent portion 7a3 and is recessed radially outward.

Description

Technical Field

[0001] This disclosure relates to a discharging tool.

Background Art

[0002] There is known a discharge pump having a mounting cap attached to the mouth of a container, a cylinder member held by the mounting cap and having a sliding surface, a piston sliding in the vertical direction on the sliding surface, a pump chamber defined by the cylinder member and the piston, and a lifting member having a discharge port and moving up and down with respect to the cylinder member along with the piston to send and discharge the contents from the container to the discharge port (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, when trying to ensure the sealing performance between the seal portion of the piston and the sliding surface of the cylinder member, the frictional force acting between the two increases, and the sliding resistance when pushing down the lifting member may increase. Therefore, there is still room for improvement in this regard.

[0005] Therefore, an object of the present disclosure is to provide a new discharging tool capable of reducing the pushing force of a lifting member for operating a pump while ensuring the sealing performance between the seal portion of the piston and the sliding surface of the cylinder member.

Means for Solving the Problems

[0006] This disclosure has been made to solve the above problems, and the discharging tool of the present disclosure is [1] A cap that is attached to the mouth of the container, A cylinder member that is held by the mounting cap and has a sliding surface, A piston that slides vertically on the sliding surface, The pump chamber is partitioned by the cylinder member and the piston, It has a discharge port and a lifting member that moves up and down relative to the cylinder member with the piston, thereby sending the contents from inside the container to the discharge port via the pump chamber and discharging them, The piston has a base end and a lower seal portion that is inclined radially outward downward from the base end and slides on the sliding surface, and an upper seal portion that extends upward and contacts the cylinder member at least at the top dead center of the lifting member. The lower seal portion has a bent portion between the base end and the lower end, which is a transitional position where the angle of inclination changes discontinuously, and the angle of inclination radially outward toward downward is greater at the lower end, which is below the bent portion, than at the base end, which is above the bent portion. The lower seal portion is characterized in that it is provided with a first recess on its radially inner surface, which overlaps with the bent portion or is located adjacent to and below the bent portion, and which is recessed radially outward.

[0007] Furthermore, the dispensing device of this disclosure is [2] In the configuration described in [1] above, it is preferable to have one or more second recesses below the first recess.

[0008] Furthermore, the dispensing device of this disclosure is [3] In the configuration described in [1] or [2] above, the upper end of the upper seal portion has a projection that protrudes radially inward, and it is preferable that at least at the top dead center of the lifting member, the projection contacts a contact cylinder portion that hangs down from the upper part of the cylinder member radially inward from the sliding surface of the cylinder member, from the radially outward side. [Effects of the Invention]

[0009] According to this disclosure, it is possible to provide a novel discharge device that can reduce the downward force of the lifting member for operating the pump while ensuring the sealing performance between the seal portion of the piston and the sliding surface of the cylinder member. [Brief explanation of the drawing]

[0010] [Figure 1] This is a front cross-sectional view showing the state of a dispensing device before dispensing, according to one embodiment of the present disclosure. [Figure 2] Figure 1 is an enlarged front view of the piston portion. [Figure 3] Figure 1 is a front cross-sectional view showing the state of the dispensing device during dispensing. [Figure 4] This is an enlarged front view showing the first modified example of the piston in Figure 1. [Figure 5] This is an enlarged front view showing a second modified example of the piston in Figure 1. [Modes for carrying out the invention]

[0011] The embodiments of this disclosure will be described below with reference to the drawings.

[0012] Figures 1 and 3 show a dispensing container 1 in which a dispensing device 2 according to one embodiment of the present disclosure is attached to the mouth 3a of a container 3. The container 3 has a mouth 3a, a body 3b, and a bottom (not shown) in that order from top to bottom, and contains contents 4. The contents 4 are not particularly limited, but in this embodiment they are liquids such as lotions and shampoos.

[0013] In the specification, claims, abstract, and drawings of the present application, the side where the lifting member 9 described later is located is defined as the upper side (the upper side in FIG. 1), and the side where the container 3 is arranged is defined as the lower side (the lower side in FIG. 1). Also, the side where the discharge port 9a1 is provided is defined as the front side (the left side in FIG. 1), and the opposite side is defined as the rear side (the right side in FIG. 1). Further, the direction orthogonal to the vertical and front-rear directions (the direction perpendicular to the plane of the paper in FIG. 1) is defined as the left-right direction. Also, the radially outer side refers to the direction away from the central axis O of the discharge container 1 along a straight line passing through the central axis O and perpendicular to the central axis O, and the radially inner side refers to the direction toward the central axis O along the straight line. Also, the circumferential direction is the rotational direction around the central axis O. The discharge tool 2 may be referred to as having an upstream side where the through-hole 6b7 through which the content 4 in the container 3 flows in is provided, and a downstream side where the discharge port 9a1 is provided.

[0014] The discharge tool 2 includes a mounting cap 5 attached to the mouth portion 3a of the container 3, a cylinder member 6 held by the mounting cap 5 and having a sliding surface 6b1 on the inner side, a piston 7 that slides in the vertical direction on the sliding surface 6b1, a pump chamber 8 partitioned below the piston 7 by the cylinder member 6 (lower cylinder member 6b) and the piston 7, and a lifting member 9 that has a discharge port 9a1 and reciprocates (moves up and down) with respect to the cylinder member 6 along with the piston 7 to send the content 4 in the container 3 to the discharge port 9a1 through the pump chamber 8 for discharge. The cylinder member 6 includes an upper cylinder member 6a held by the mounting cap 5 and a lower cylinder member 6b attached to and held by the upper cylinder member 6a and having the sliding surface 6b1.

[0015] The lifting member 9 includes a pressing head 9a having a discharge port 9a1 and receiving a pressing operation, a stem portion 9b extending downward from the pressing head 9a and moving up and down along with the piston 7, an internal flow path 9c extending from the pump chamber 8 to the discharge port 9a1, and an opening / closing portion 9d that opens the internal flow path 9c when the lifting member 9 descends and closes the internal flow path 9c when it ascends. Note that the discharge tool 2 is not limited to the mode using the pressing head 9a, and for example, it may be configured to move the piston by an operation of pulling a trigger.

[0016] In this embodiment, the stem portion 9b has a cylindrical shape centered on the central axis O and includes a stem 9b1 attached to the pressing head 9a, and a piston guide 9b2 attached to the inner peripheral surface of the stem 9b1. The piston 7 is held so as to be able to move up and down between the stem 9b1 and the piston guide 9b2. The opening / closing portion 9d is formed at the upstream end of the internal flow path 9c by the lower contact portion 7d of the piston 7 and the piston guide 9b2. The opening / closing portion 9d opens when the piston guide 9b2 descends with respect to the piston 7, and closes when the piston guide 9b2 ascends with respect to the piston 7. Note that the opening / closing portion 9d is not limited to the configuration formed by the piston 7 and the piston guide 9b2.

[0017] The discharge tool 2 has a suction valve 10 that closes the upstream end of the pump chamber 8 when the elevating member 9 descends, and opens the upstream end of the pump chamber 8 due to the negative pressure in the pump chamber 8 when the elevating member 9 ascends. In this embodiment, the suction valve 10 is constituted by an elastic valve 10a having a valve body support portion 10a1 held in the pump chamber 8 and an elastic valve body 10a2 supported by the valve body support portion 10a1 so as to be able to move up and down by elastic deformation of an arm, but is not limited thereto.

[0018] The discharge tool 2 has a spring portion 11 that biases the elevating member 9 upward. By pressing the pressing head 9a against the biasing force of the spring portion 11, the elevating member 9 is lowered to send and discharge the content 4 in the pump chamber 8 to the discharge port 9a1. Further, when the pressing operation is released, the elevating member 9 ascends by the biasing force of the spring portion 11 to suck the content 4 from the container 3 into the pump chamber 8.

[0019] The lower cylinder member 6b has a fitting hole 6b5 at its upper part, and the discharger 2 has an outside air introduction path 12 that introduces outside air into the container 3 through the fitting hole 6b5 as the contents 4 are discharged. The outside air introduction path 12 guides outside air into the container 3 through the gap between the stem 9b1 and the spring part 11, the gap between the lower cylinder peripheral wall 6b3 and the upper cylinder peripheral wall 6a2, and the fitting hole 6b5 (see Figure 3). The piston 7 is annular in shape with the central axis O as its center. Furthermore, as shown in Figure 2, the piston 7 has a lower seal portion 7a having a base end portion 7a5 connected to the lower part of the radially outer end of the central base portion 7c, and a lower end portion 7a4 that slopes radially outward downward from the base end portion 7a5 and slides on the sliding surface 6b1, and an upper seal portion 7b that extends upward from the central base portion 7c and abuts against the outer surface of the lower part (contact cylinder portion 6a9) of the upper cylinder member 6a at least at the top dead center of the lifting member 9. The piston 7 also has a lower contact portion 7d extending downward from the radially inner end of the central base portion 7c and an upper contact portion 7e extending upward. That is, the central base portion 7c connects the lower seal portion 7a and the upper seal portion 7b at approximately the center position in the vertical direction at its radially outer end, and connects the lower contact portion 7d and the upper contact portion 7e at approximately the center position in the vertical direction at its radially inner end. The lower contact portion 7d, together with the piston guide 9b2, forms the opening and closing portion 9d. The upper contact portion 7e slidably contacts the radially inner surface of the lower part of the stem 9b1.

[0020] The lower seal portion 7a has a larger angle of inclination with respect to the central axis O at its lower end 7a4 than at its base end 7a5 directly below the central base portion 7c, and a first recess 7a1 is provided on the radially inner surface of the lower seal portion 7a, which is recessed radially outward. Below the first recess 7a1, a second recess 7a2 is provided, which is similarly recessed radially outward.

[0021] The lower seal portion 7a has a bent portion 7a3, which is a transition point where the inclination angle changes discontinuously. That is, in the example shown in Figure 2, the lower seal portion 7a has a base end portion 7a5 (the range from the upper edge of the lower seal portion 7a to the bent portion) directly below the central base portion 7c that extends almost vertically downward, but the lower end portion 7a4, located below the bent portion 7a3 shown in the figure, has an increasing radial outward inclination angle downward. The first recess 7a1 is provided either overlapping with the bent portion 7a3 or adjacent to and below the bent portion 7a3. In the example in Figure 2, the upper end of the first recess 7a1 overlaps with the bent portion 7a3, but the upper end of the first recess 7a1 may coincide with the lower end of the bent portion 7a3 or be located below the bent portion 7a3. Also, the upper end of the first recess 7a1 may extend above the bent portion 7a3. The inner corners of the bent portion 7a3 may be rounded off. Furthermore, the base portion 7a5 may have a shape that extends radially outward toward the downward direction.

[0022] The base end portion 7a5 of the lower seal portion 7a is located in the region above the bent portion 7a3 (described later) in the lower seal portion 7a, which extends downward from the central base portion 7c, and is adjacent to the lowest part of the central base portion 7c. The lower end portion 7a4 of the lower seal portion 7a is located in the region below the bent portion 7a3 (described later), and is the lower region of the lower seal portion 7a that contacts the sliding surface 6b1 in Figure 2. Therefore, the inclination angle of the base end portion 7a5 is defined in the region above the bent portion 7a3 in the lower seal portion 7a. The inclination angle of the lower end portion 7a4 is defined in the region below the bent portion 7a3 in the lower seal portion 7a.

[0023] The base portion 7a5 and the lower portion 7a4 may have a straight cross-sectional shape, as shown in Figure 2, or they may have an arc-shaped cross-sectional shape. When the base portion 7a5 and the lower portion 7a4 are arc-shaped, the inclination angles of the base portion 7a5 and the lower portion 7a4 are defined by the average inclination angle above the bent portion 7a3 and the average inclination angle below the bent portion 7a3, respectively. The average inclination angle of the base portion 7a5 is the angle of the straight line connecting the radial center of the upper edge of the base portion 7a5 and the radial center of the lower edge. The average inclination angle of the lower portion 7a4 is the angle of the straight line connecting the radial center of the upper edge of the lower portion 7a4 and the radial center of the lower edge.

[0024] In this embodiment, a first recess 7a1 is provided that overlaps with the bent portion 7a3 or is located adjacent to the bent portion 7a3 below it and is recessed radially outward. In addition, two second recesses 7a2 are provided below the first recess 7a1. In the example shown in Figure 2, the upper end of the first recess 7a1 overlaps with the bent portion 7a3. With this configuration, below the bent portion 7a3, the angle of inclination radially outward toward the downward is increased, allowing the lower end 7a4 (the tip of the lower end 7a4) of the lower seal portion 7a to slide more reliably against the sliding surface 6b1 of the cylinder member 6 and seal. Furthermore, when the lifting member 9 is pushed down, the lower seal portion 7a bends at the height of the first recess 7a1 and the second recess 7a2 such that the lower end 7a4 of the lower seal portion 7a is slightly displaced radially inward. Therefore, the frictional force between the lower seal portion 7a and the sliding surface 6b1 when the lifting member 9 is pushed down can be reduced.

[0025] Furthermore, if the piston 7 is provided with a first recess 7a1 and a second recess 7a2, when the piston 7 is molded in the mold, shapes corresponding to the first recess 7a1 and the second recess 7a2 can be provided on the core (male mold) side, making it easier for the molded piston 7 to engage with the recesses on the core side. With this configuration, when the mold is opened, the piston 7 can engage with the core side and be easily released from the cavity (female mold), so the molded piston 7 can be easily removed from the mold.

[0026] The second recess 7a2 may be provided in only one location below the first recess 7a1, or in three or more locations. Alternatively, as shown in Figure 4, the lower seal portion 7a may have only one first recess 7a1 and no second recess 7a2. Even with this configuration, the lower end portion 7a4 of the lower seal portion 7a is slightly more likely to be displaced radially inward by the amount of the first recess 7a1. Therefore, the frictional force between the lower seal portion 7a and the sliding surface 6b1 when the lifting member 9 is pushed down can be reduced.

[0027] The piston 7 has an upper seal portion 7b that extends upward from the radially outer end of the central base portion 7c and contacts the cylinder member 6 at least at the top dead center of the lifting member 9 (see Figure 1). In this embodiment, the upper seal portion 7b has a projection 7b1 that protrudes radially inward at its upper end, and at least at the top dead center of the lifting member 9 (see Figure 1), the projection 7b1 contacts the contact cylindrical portion 6a9 of the upper cylinder member 6, which hangs down from the upper part of the cylinder member 6, from the radially outer side, radially inward from the sliding surface 6b1 of the cylinder member 6.

[0028] With the above configuration, when the lifting member 9 is pushed down and the upper seal portion 7b of the piston 7 is separated vertically from the contact cylinder portion 6a9 (see Figure 3), releasing the push on the lifting member 9 causes the lifting member 9 to move upward due to the biasing force of the spring portion 11, and the upper seal portion 7b of the piston 7 comes into contact with the contact cylinder portion 6a9 again from the radially outer side. At this time, the upper seal portion 7b of the piston 7 is easily displaced radially outward because the projection 7b1 comes into contact with the contact cylinder portion 6a9, so the lower seal portion 7a of the piston 7 is more likely to move radially inward, and the frictional force with the sliding surface 6b1 is weakened. Therefore, the frictional force between the piston 7 and the cylinder member 6 when the lifting member 9 moves upward is reduced, and the lifting member 9 can be raised without getting stuck. As shown in Figure 2, it is preferable that the radially outer surface of the lower end of the contact cylinder portion 6a9 has an R surface 6a10 that slopes radially outward from bottom to top. This configuration allows the upper seal portion 7b to be smoothly displaced slightly radially outward when the piston 7 moves upward relative to the cylinder member 6.

[0029] On the other hand, as shown in Figure 5, when the upper seal portion 7b of the piston 7 abuts against the contact cylinder portion 6a9 from the radially inward direction, the upper seal portion 7b of the piston 7 is displaced radially inward as the projection 7b1 abuts against the contact cylinder portion 6a9. Therefore, the lower seal portion 7a of the piston 7 tends to move radially outward, which may increase the frictional force with the sliding surface 6b1. However, even in the embodiment shown in Figure 5, the lower end portion 7a4 of the lower seal portion 7a is provided with a first recess 7a1 and two second recesses 7a2. Because the lower end portion 7a4 of the lower seal portion 7a is more easily displaced radially inward by the amount of the first recess 7a1 and the second recesses 7a2, the frictional force between the lower seal portion 7a and the sliding surface 6b1 when pushing down the lifting member 9 can be reduced even in the embodiment shown in Figure 5.

[0030] The mounting cap 5 has a mounting cylinder 5a that is screwed onto the outer circumferential surface of the opening 3a, an annular top wall 5b extending radially inward from the upper end of the mounting cylinder 5a, and a guide cylinder 5c extending upward from the inner circumferential edge of the top wall 5b and guiding the up and down movement of the push-down head 9a. The upper cylinder member 6a has a flange portion 6a1 that is sandwiched between the upper end surface of the opening 3a and the top wall 5b. The mounting cylinder 5a of the mounting cap 5 has a regulating projection 5a1 that restricts the outer circumferential edge of the flange portion 6a1 from coming out downward from the upper end of the inner circumferential surface of the mounting cylinder 5a by contacting the outer circumferential edge. The regulating projection 5a1 extends continuously or intermittently in the circumferential direction. A packing 13 is provided on the lower surface of the flange portion 6a1, and the packing 13 is sandwiched between the flange portion 6a1 and the upper end surface of the opening 3a.

[0031] As shown in Figure 1, the lower cylinder member 6b has a sliding surface 6b1 and a lower cylinder circumferential wall 6b3 centered on the central axis O, and a lower cylinder bottom 6b4 connected to the lower end of the lower cylinder circumferential wall 6b3. The lower cylinder bottom 6b4 has a through hole 6b7 through which the contents 4 pass. The valve body support 10a1 is held at the lower end of the lower cylinder circumferential wall 6b3. The lower cylinder circumferential wall 6b3 has a fitting hole 6b5 that penetrates the lower cylinder circumferential wall 6b3 radially above the sliding surface 6b1, and a guide groove 6b6 that extends from the upper end of the lower cylinder circumferential wall 6b3 along the inner circumferential surface of the lower cylinder circumferential wall 6b3 to just before the fitting hole 6b5. The guide groove 6b6 is formed as a recess that does not penetrate the lower cylinder circumferential wall 6b3 radially and opens upward. The lower end of the guide groove 6b6 forms a guide surface in which the radial depth gradually decreases downward. The fitting hole 6b5 and the guide groove 6b6 are provided at the same position and with the same width in the circumferential direction.

[0032] As shown in Figure 1, the upper cylinder member 6a has an upper cylinder circumferential wall 6a2 extending downward from the inner circumferential edge of the flange portion 6a1. The upper cylinder circumferential wall 6a2 is inserted into the lower cylinder circumferential wall 6b3 of the lower cylinder member 6b and contacts the inner circumferential surface of the lower cylinder circumferential wall 6b3 above the sliding surface 6b1. The upper cylinder circumferential wall 6a2 has a fitting projection 6a3 that protrudes radially outward. The fitting projection 6a3 passes downward through the guide groove 6b6 and fits into the fitting hole 6b5, restricting the upward movement of the upper cylinder member 6a relative to the lower cylinder member 6b. The lower surface of the fitting projection 6a3 is inclined radially outward from downward to upward, and the upper surface extends horizontally. The upper cylinder circumferential wall 6a2 also has a stopper surface 6a4 that contacts the lower cylinder circumferential wall 6b3, thereby restricting the downward movement of the upper cylinder member 6a relative to the lower cylinder member 6b. In this embodiment, the stopper surface 6a4 is provided in a stepped manner on the outer circumferential surface of the upper cylinder peripheral wall 6a2 and abuts against the upper end surface of the lower cylinder peripheral wall 6b3, but is not limited to this. The fitting of the upper cylinder member 6a and the lower cylinder member 6b is performed by inserting the fitting projection 6a3 into the guide groove 6b6, pushing the upper cylinder member 6a toward the lower cylinder member 6b, and abutting the stopper surface 6a4 of the upper cylinder member 6a against the upper end surface of the lower cylinder peripheral wall 6b3, thereby causing the fitting projection 6a3 to enter the fitting hole 6b5 and lock into place.

[0033] In this embodiment, four sets of fitting holes 6b5, guide grooves 6b6, and fitting protrusions 6a3 are provided at equal intervals in the circumferential direction. However, the number of sets of fitting holes 6b5, guide grooves 6b6, and fitting protrusions 6a3 provided in the cylinder member 6 is not limited to this. The upper cylinder member 6a and the lower cylinder member 6b are each formed by injection molding of resin material.

[0034] The upper cylinder member 6a has a protective portion 6a5 that covers the upper seal portion 7b from above. In this embodiment, the protective portion 6a5 protrudes radially outward from a contact cylinder portion 6a9 that hangs down from a spring receiving portion 6a6 at the lower end of the upper cylinder peripheral wall 6a2. The lower surface of the protective portion 6a5 extends downward toward the radially outward direction. By providing the protective portion 6a5, excessive displacement of the upper seal portion 7b of the piston 7 is restricted.

[0035] The upper cylinder member 6a has a spring receiving portion 6a6 that extends radially inward from the lower end of the upper cylinder peripheral wall 6a2. The spring receiving portion 6a6 is composed of an annular wall 6a7 that extends radially inward and a cylindrical wall 6a8 that extends upward from the inner peripheral edge of the annular wall 6a7, and the lower end of the spring portion 11 is fitted between the cylindrical wall 6a8 and the upper cylinder peripheral wall 6a2. The spring portion 11 is a resin compression spring that forms an annular shape surrounding the stem 9b1 in plan view and expands and contracts in the vertical direction. The upper end of the spring portion 11 supports the pressing head 9a. The spring portion 11 is not limited to being made of resin, but may be made of metal, for example.

[0036] The lower cylinder member 6b preferably has higher lubricity than the upper cylinder member 6a in order to improve sliding performance on the sliding surface 6b1. Lubricity to the lower cylinder member 6b can be provided by selecting a material with higher lubricity than the upper cylinder member 6a, or by molding the lower cylinder member 6b from a resin material to which a lubricant such as a higher fatty acid metal salt has been added (mixed). Alternatively, lubricity may be provided by applying a lubricant such as silicone after the lower cylinder member 6b has been formed. Among the above, from the viewpoint of productivity, lubricity is provided by adding a lubricant. For example, when the lower cylinder member 6b and the upper cylinder member 6a are molded from the same resin material, it is preferable not to add a lubricant or apply a lubricant to the upper cylinder member 6a.

[0037] According to this embodiment, the cylinder member 6 is composed of an upper cylinder member 6a that is held by fitting into the mounting cap 5, and a lower cylinder member 6b that has a sliding surface 6b1 and is more lubricated than the upper cylinder member 6a. Therefore, it is possible to achieve both the sliding performance of the piston 7 on the sliding surface 6b1 and the fitting force of the upper cylinder member 6a to the mounting cap 5. Note that the cylinder member 6 may be composed of a single member having the sliding surface 6b1.

[0038] As described above, the discharge device 2 of this embodiment includes a mounting cap 5 attached to the mouth 3a of the container 3, a cylinder member 6 held by the mounting cap 5 and having a sliding surface 6b1, a piston 7 that slides vertically on the sliding surface 6b1, a pump chamber 8 partitioned by the cylinder member 6 and the piston 7, and a lifting member 9 that moves up and down with the piston 7 relative to the cylinder member 6 to send the contents 4 from inside the container 3 through the pump chamber 8 to the discharge port 9a1 and discharge it. The piston 7 has a base end 7a5 and a lower end that is inclined radially outward downward from the base end 7a5 and slides on the sliding surface 6b1. The lower seal portion 7a has a lower seal portion 7a with a section 7a4, and an upper seal portion 7b extends upward and contacts the cylinder member 6 at least at the top dead center of the lifting member 9. The lower seal portion 7a has a bent portion 7a3 between its base end 7a5 and lower end 7a4, which is a change position where the inclination angle changes discontinuously. The lower end 7a4, which is below the bent portion 7a3, has a larger radially outward inclination angle downward than the base end 7a5, which is above the bent portion 7a3. The radially inner surface of the lower seal portion 7a is provided with a first recess 7a1 that overlaps with the bent portion 7a3 or is provided adjacent to the lower bent portion 7a3 and recesses radially outward. By adopting this configuration, the radially outward inclination angle downward is made larger at the lower end 7a4 of the lower seal portion 7a, allowing the lower end 7a4 of the lower seal portion 7a to slide more reliably against the sliding surface 6b1 of the cylinder member 6 and seal. Furthermore, by providing a first recess 7a1 in the lower seal portion 7a, the lower end portion 7a4 of the lower seal portion 7a can be easily displaced radially inward when the lifting member 9 is pushed down. Therefore, the frictional force between the lower seal portion 7a and the sliding surface 6b1 when the lifting member 9 is pushed down can be reduced. In addition, when forming the piston 7 in the mold, a shape corresponding to the first recess 7a1 can be provided on the core (male mold) side, making it easier for the formed piston 7 to engage with the irregularities on the core side. With this configuration, when opening the mold, the piston 7 can engage with the core side and be easily released from the cavity (female mold), so the piston 7 can be easily removed from the mold.

[0039] Furthermore, in this embodiment, the lower seal portion 7a has one or more second recesses 7a2 located below the first recess 7a1. By adopting this configuration, when the lifting member 9 is pushed down, the lower end portion 7a4 of the lower seal portion 7a can be displaced more easily radially inward compared to the case where only the first recess 7a1 is provided. Therefore, the frictional force between the lower seal portion 7a and the sliding surface 6b1 when the lifting member 9 is pushed down can be reduced more reliably.

[0040] Furthermore, in this embodiment, the upper end of the upper seal portion 7b has a projection 7b1 that protrudes radially inward, and at least at the top dead center of the lifting member 9, the projection 7b1 is radially inward of the sliding surface 6b1 of the cylinder member 6 and is configured to contact the contact cylinder portion 6a9 that hangs down from the upper part of the cylinder member 6 from the radially outward direction. With this configuration, when the lifting member 9 is released from a state where the upper seal portion 7b of the piston 7 is separated vertically from the contact cylinder portion 6a9 (see Figure 3) due to the pushing force of the spring portion 11, the lifting member 9 moves upward, and the upper seal portion 7b of the piston 7 contacts the contact cylinder portion 6a9 again from the radially outward direction. In this case, the upper seal portion 7b of the piston 7 is easily displaced radially outward due to the protrusion 7b1 contacting the contact cylinder portion 6a9, while the lower seal portion 7a of the piston 7 is more likely to move radially inward, thereby reducing the frictional force with the sliding surface 6b1. Consequently, the frictional force between the piston 7 and the cylinder member 6 when the lifting member 9 moves upward is reduced, allowing the lifting member 9 to rise without getting stuck.

[0041] While this disclosure has been described based on various drawings and embodiments, it should be noted that those skilled in the art will find it easy to make various modifications and alterations based on this disclosure. Therefore, it should be noted that these modifications and alterations are included within the scope of the present invention. For example, the functions included in each component can be rearranged in a logically consistent manner, and multiple components can be combined into one or separated. It should be understood that these are also included within the scope of the present invention.

[0042] For example, in this embodiment, the upper seal portion 7b of the piston 7 is configured not to slide against the sliding surface 6b1 of the cylinder member 6. However, the embodiment is not limited to this configuration, and the upper seal portion 7b of the piston 7 may be configured to slide together with the lower seal portion 7a against the sliding surface 6b1 of the cylinder member 6. When the upper seal portion 7b of the piston 7 slides against the sliding surface 6b1 of the cylinder member 6, a first recess 7a1 and a second recess 7a2 may also be provided on the upper seal portion 7b side. Furthermore, it is preferable to configure the upper seal portion 7b to contact a part of the upper cylinder member 6a to suppress the upward movement of the lifting member 9. [Explanation of Symbols]

[0043] 1 Discharge container 2 Dispensing tool 3 containers 3a Mouth 3b Torso 4 Contents 5. Attachment cap 5a Mounting tube 5a1 Regulatory protrusion 5b Top wall 5c guide tube 6 Cylinder Member 6a Upper cylinder member 6a1 Flange section 6a2 Upper cylinder peripheral wall 6a3 Fitting protrusion 6a4 Stopper surface 6a5 Protective section 6a6 Spring support 6a7 Ring Wall 6a8 Cylindrical wall 6a9 Contact cylinder part 6a10 R side 6b Lower cylinder member 6b1 Sliding surface 6b3 Lower cylinder peripheral wall 6b4 Bottom of lower cylinder 6b5 Fitting hole 6b6 Guide groove 6b7 Through hole 7 pistons 7a Lower seal portion 7a1 First recess 7a2 2nd recess 7a3 Bent part 7a4 Bottom end 7a5 Base end (of the lower seal) 7b Upper seal section 7b1 Protrusion 7c central base 7d Lower contact part 7e Upper contact part 8 Pump Room 9 Lifting Member 9a Press head 9a1 Discharge port 9b Stem section 9b1 stem 9b2 Piston Guide 9c Internal flow path 9d Opening / Closing Section 10. Suction valve 10a Elastic valve 10a1 Valve support 10a2 Elastic valve body 11 Spring section 12. Outside air intake path 13 Gasket O center axis

Claims

1. A cap that is attached to the mouth of the container, A cylinder member that is held by the mounting cap and has a sliding surface, A piston that slides vertically on the sliding surface, The pump chamber is partitioned by the cylinder member and the piston, It has a discharge port and a lifting member that moves up and down relative to the cylinder member with the piston, thereby sending the contents from inside the container to the discharge port via the pump chamber and discharging them, The piston has a base end and a lower seal portion that is inclined radially outward downward from the base end and slides on the sliding surface, and an upper seal portion that extends upward and contacts the cylinder member at least at the top dead center of the lifting member. The lower seal portion has a bent portion between the base end and the lower end, which is a transitional position where the angle of inclination changes discontinuously, and the angle of inclination radially outward toward downward is greater at the lower end, which is below the bent portion, than at the base end, which is above the bent portion. Discharge device wherein the radially inner surface of the lower seal portion is provided with a first recess that overlaps with the bent portion or is located below and adjacent to the bent portion and is recessed radially outward.

2. The dispensing device according to claim 1, further having one or more second recesses located below the first recess.

3. The discharge device according to claim 1 or 2, wherein the upper end of the upper seal portion has a projection that protrudes radially inward, and at least at the top dead center of the lifting member, the projection abuts radially outward from the outer part of a contact cylinder that hangs down from the upper part of the cylinder member, radially inward from the sliding surface of the cylinder member of the cylinder member.

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