Pump-type dispensing instrument and container

Abstract

To provide a pump-type dispensing instrument and container allowed to reduce the force required to push down a depression head.SOLUTION: A pump-type dispensing instrument 1 and container 2 comprises a mount cap 10, a cylinder body 20 having first and second cylinder units 21, 22, a stem 30 free to move in an up-down direction, a depression head 40 attached on the stem 30, a spring 50 provided between the mount cap 10 and the depression head 40, a main piston 60 provided on an outer peripheral face of the stem 30 and contacting the first cylinder unit 21, an inlet-side check valve 70 provided at a lower end of the cylinder body 20, a stem coupling cylinder 80 having through-holes 83, 84 and fixed at a lower end of the stem 30, an outlet-side check valve 90 provided on an inside flow passage 31, a sub-piston 100 having a communication hole 103 and arranged below the main piston 60 with spacing, and a piston guide 110 abutting against the sub-piston 100.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a pump-type dispenser and a pump-type discharge container.

Background Art

[0002] As a discharge container for storing disinfecting alcohol, hand soap, etc. as contents, in order to facilitate the removal of the contents, a pump provided with a cylinder body, a stem, a piston, an inflow-side check valve, an outflow-side check valve, etc., a push-down head attached to the stem, a spring for biasing the push-down head upward, and a mounting cap for fixing the pump to the mouth of the container, or a pump-type discharge container in which the pump-type dispenser is attached to the mouth of the container is known (for example, Patent Document 1).

[0003] According to such a pump-type dispenser or pump-type discharge container, by pushing the push-down head from the upper end position toward the lower end position, the piston can be actuated along the cylinder body to discharge the contents from the nozzle portion of the push-down head to the outside.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the above-described conventional pump-type dispenser or pump-type discharge container, a discharge resistance corresponding to the amount of the discharged contents is applied to the push-down head from the start of the push-down of the push-down head until the push-down head reaches the bottom dead center, so there is a problem that a relatively large force is required for the push-down operation of the push-down head.

[0006] The present invention has been made in view of such problems, and an object thereof is to provide a pump-type discharging tool and a pump-type discharging container capable of reducing the force required for the pressing-down operation of the pressing-down head.

Means for Solving the Problems

[0007] The pump-type dispenser of the present invention is a pump-type dispenser that is used by being attached to the mouth portion of a container body, and includes a mounting cap that is attached to the mouth portion, a first cylinder portion, and a second cylinder portion having a larger diameter than the first cylinder portion that is connected via a step portion below the first cylinder portion. The dispenser also includes a cylinder body supported by the mounting cap, a stem that is cylindrical, has an upper end that protrudes upward from the mounting cap, and is movable up and down with respect to the cylinder body, and a nozzle portion that is connected to an inner flow path of the stem. The dispenser further includes a push-down head attached to the upper end of the stem, a spring provided between the mounting cap and the push-down head that biases the push-down head upward with respect to the mounting cap, a main piston provided on an outer peripheral surface of the stem that contacts an inner peripheral surface of the first cylinder portion and partitions a cylinder chamber inside the cylinder body, an inflow-side check valve provided at a lower end of the cylinder body that opens and closes to allow the inflow of the content from the inside of the container body into the cylinder chamber, a stem connecting cylinder body that is formed in a bottomed cylindrical shape and fixed to the lower end of the stem, has a through hole in a peripheral wall that closes the inner flow path at a bottom wall and communicates the cylinder chamber and the inner flow path, an outflow-side check valve provided in the inner flow path above the through hole that opens and closes to allow the outflow of the content from the cylinder chamber toward the nozzle portion, an upper seal portion that is disposed at a lower side of the main piston with a space therebetween and contacts the inner peripheral surface of the first cylinder portion, and a lower seal portion that contacts the inner peripheral surface of the second cylinder portion. The dispenser further includes a sub-piston that partitions a sub-cylinder chamber between the sub-piston and the cylinder body and has a communication hole that communicates the cylinder chamber and the sub-cylinder chamber, and a piston guide provided on the stem connecting cylinder body below the through hole that contacts the sub-piston below the communication hole and partitions a main cylinder chamber between the sub-piston and the inflow-side check valve.

[0008] In the pump-type dispenser of the present invention, in the above configuration, it is preferable that a spring receiving portion with which the spring engages is integrally provided on the mounting cap.

[0009] In the pump-type applicator of the present invention, in the above configuration, it is preferable that the spring is made of synthetic resin.

[0010] The pump-type discharge container of the present invention is characterized by having a container body and the pump-type applicator according to claim 1 attached to the mouth of the container body.

Effect of the Invention

[0011] According to the present invention, it is possible to provide a pump-type applicator and a pump-type discharge container capable of reducing the force required for the pressing operation of the pressing head.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0013] Hereinafter, the pump-type applicator 1 and the pump-type discharge container 2 according to an embodiment of the present invention will be described in detail with reference to the drawings.

[0014] In the present specification and claims, the vertical direction means the vertical direction in the state where the pump-type discharge tool 1 to the pump-type discharge container 2 is in the upright posture shown in FIG. 1.

[0015] As shown in FIG. 1, the pump-type discharge tool 1 according to the present embodiment is a so-called dispenser that is attached to and used at the mouth portion 3a of the container body 3. The pump-type discharge container 2 is constituted by the pump-type discharge tool 1 and the container body 3.

[0016] The container body 3 is, for example, a synthetic resin bottle container having a cylindrical mouth portion 3a centered on the axis O. The container body 3 can store, for example, a liquid or fluid such as disinfecting alcohol or hand soap as the content 4 inside. The pump-type discharge tool 1 can distribute the content 4 stored in the container body 3 by a predetermined amount and discharge it to the outside.

[0017] The pump-type discharge tool 1 has a mounting cap 10, a cylinder body 20, a stem 30, a push-down head 40, a spring 50, a main piston 60, an inflow-side check valve 70, a stem connection cylinder body 80, an outflow-side check valve 90, a sub-piston 100, and a piston guide 110.

[0018] The mounting cap 10 includes a cap body 11 made of synthetic resin having a toped cylindrical shape centered on the axis O, and is detachably attached to the mouth portion 3a by screw connection in the cap body 11. Note that the cap body 11 is not limited to screw connection, and may be configured to be attached to the mouth portion 3a by, for example, caulking. In the present embodiment, a cylindrical guide cylinder 12 extending in the vertical direction from the top wall 11a of the cap body 11 is integrally provided on the mounting cap 10. An annular spring receiving portion 13 along the inner peripheral surface of the guide cylinder 12 is integrally provided at the lower end of the guide cylinder 12.

[0019] The cylinder body 20 is made of synthetic resin and includes a first cylinder part 21 and a second cylinder part 23 having a larger diameter than the first cylinder part 21 that is integrally connected to the first cylinder part 21 via a stepped part 22 below the first cylinder part 21. The first cylinder part 21 and the second cylinder part 23 are each cylindrical with the axis O as the center.

[0020] The cylinder body 20 is supported by the mounting cap 10 and disposed inside the container body 3 by fitting and fixing the upper end of the first cylinder part 21 inside the lower end of the guide cylinder 12. In this embodiment, a cover cylinder 24 is mounted on the mounting cap 10, and the cylinder body 20 is disposed inside the cover cylinder 24 with the second cylinder part 23 fitted and fixed inside the cover cylinder 24. The lower end of the cover cylinder 24 is a connecting cylinder part 24a, and a tube 25 communicating with the inside of the container body 3 is connected to the connecting cylinder part 24a. Although not shown in detail, the tube 25 extends to the bottom of the container body 3.

[0021] Air replacement holes 26 and 27 are provided in the first cylinder part 21 and the cover cylinder 24, respectively, to introduce outside air into the container body 3 as the content 4 stored in the container body 3 decreases.

[0022] The stem 30 is made of synthetic resin, is cylindrical with the axis O as the center, and has an inner flow path 31 inside. The stem 30 is disposed such that its upper end protrudes upward from the mounting cap 10 and is movable up and down along the axis O with respect to the cylinder body 20 between the top dead center position shown in FIG. 1 and the bottom dead center position shown in FIG. 3.

[0023] The pressing-down head 40 is made of synthetic resin and includes a nozzle portion 41 that continues to the inner flow path 31 of the stem 30. The mounting cylinder portion 43 provided on the head main body 42 is fitted and fixed to the upper end of the stem 30 and is attached to the upper end of the stem 30. The nozzle portion 41 protrudes laterally from the head main body 42, and its tip serves as the discharge port 41a of the content 4. The head main body 42 integrally has a cylindrical outer peripheral wall 44 with a larger diameter than the guide cylinder 12. The outer peripheral wall 44 is guided by the guide cylinder 12 and is movable vertically between the top dead center and the bottom dead center together with the stem 30. That is, by operating the pressing-down head 40 downward, the stem 30 can be moved from the top dead center to the bottom dead center.

[0024] The spring 50 is provided between the mounting cap 10 and the pressing-down head 40 and biases the pressing-down head 40 upward, that is, toward the top dead center, with respect to the mounting cap 10. More specifically, the spring 50 is arranged outside the stem 30 around the axis O. Its upper end abuts against the lower surface of the head main body 42 of the pressing-down head 40 inside the outer peripheral wall 44, and its lower end engages with the spring receiving portion 13 provided on the mounting cap 10. By being arranged outside the stem 30, the spring 50 is configured not to touch the content 4. The pressing-down head 40 and the stem 30 move upward toward the top dead center due to the elastic force of the spring 50 in the natural state where no pressing force is applied, regardless of whether they are at the top dead center, the bottom dead center, or any position between the top dead center and the bottom dead center.

[0025] In this embodiment, the spring 50 is made of synthetic resin. By making the spring 50 of synthetic resin, when discarding the pump-type applicator 1 or the pump-type discharge container 2, it is not necessary to separate the spring 50, and the recyclability of the pump-type applicator 1 or the pump-type discharge container 2 can be enhanced. Further, in this embodiment, when the pressing head 40 is pressed from the top dead center to the bottom dead center, the spring 50 is configured to be compressed only to about half of the maximum compression amount without being compressed until the maximum compressible amount. Thus, even when a synthetic resin spring 50 is used, sagging of the spring 50 is less likely to occur.

[0026] Note that the spring 50 may be provided at a portion other than the above as long as it is provided between the mounting cap 10 and the pressing head 40. Further, the spring 50 is not limited to being made of synthetic resin, and for example, a spring made of other materials such as metal may be used.

[0027] The main piston 60 is made of synthetic resin, is provided on the outer peripheral surface of the stem 30, and contacts the inner peripheral surface of the first cylinder portion 21 to partition and form a cylinder chamber R1 inside the cylinder body 20. In this embodiment, the main piston 60 is integrally provided at the lower end of the stem 30. When the pressing head 40 moves between the top dead center and the bottom dead center together with the stem 30, the main piston 60 moves up and down together with the stem 30 while contacting the inner peripheral surface of the first cylinder portion 21 to increase or decrease the volume of the cylinder chamber R1.

[0028] The inflow-side check valve 70 is made of synthetic resin and is provided at the lower end of the cylinder body 20 to open and close so as to allow the inflow of the content 4 from the inside of the container body 3 toward the cylinder chamber R1. In the present embodiment, the inflow-side check valve 70 includes an annular support body 71 that abuts against the lower end of the cylinder body 20 and is fitted and fixed to the cover cylinder 24, a valve body 72 disposed at the upper end of the connection cylinder portion 24a, and three connecting leg portions 73 that connect the connection cylinder portion 24a and the valve body 72, and is a three-point valve. When the pressure inside the cylinder chamber R1 is the same as or higher than the pressure inside the connection cylinder portion 24a, the valve body 72 contacts the upper end of the connection cylinder portion 24a to block the space between the connection cylinder portion 24a and the cylinder chamber R1. On the other hand, when the pressure inside the cylinder chamber R1 becomes lower than the pressure inside the connection cylinder portion 24a, the plurality of connecting leg portions 73 are elastically deformed and the valve body 72 is separated from the upper end of the connection cylinder portion 24a, and the inflow-side check valve 70 is opened to communicate the space between the connection cylinder portion 24a and the cylinder chamber R1.

[0029] Note that the inflow-side check valve 70 may be a check valve having a configuration other than the above three-point valve as long as it is provided at the lower end of the cylinder body 20 and opens and closes to allow the inflow of the content 4 from the inside of the container body 3 toward the cylinder chamber R1.

[0030] The stem connection cylinder body 80 is formed of a synthetic resin material into a bottomed cylindrical shape having a peripheral wall 81 and a bottom wall 82. The stem connection cylinder body 80 has the same outer diameter as the stem 30 and is coaxially fixed to the lower end of the stem 30 to block the inner flow path 31 at the bottom wall 82. Further, upper through holes 83 and lower through holes 84 for communicating the cylinder chamber R1 and the inner flow path 31 are provided in the peripheral wall 81 of the stem connection cylinder body 80. Note that it is sufficient if either one of the upper through holes 83 and the lower through holes 84 is provided in the stem connection cylinder body 80.

[0031] The outflow-side check valve 90 is provided in the inner flow path 31 above the upper through-hole 83 and the lower through-hole 84, and opens and closes to allow the outflow of the content 4 from the cylinder chamber R1 toward the nozzle portion 41. In the present embodiment, the outflow-side check valve 90 is a ball valve type check valve including a valve seat 91 integrally provided on the inner peripheral surface of the stem 30 and a synthetic resin ball 92 disposed above the valve seat 91. When the pressure inside the cylinder chamber R1 is the same as or lower than the pressure inside the nozzle portion 41, the ball 92 contacts the valve seat 91 to block the space between the nozzle portion 41 and the cylinder chamber R1. On the other hand, when the pressure inside the cylinder chamber R1 becomes higher than the pressure inside the nozzle portion 41, the ball 92 moves upward and separates from the valve seat 91, and the outflow-side check valve 90 is opened to communicate the space between the nozzle portion 41 and the cylinder chamber R1.

[0032] Note that the outflow-side check valve 90 may be a check valve having a configuration other than the above as long as it is provided in the inner flow path 31 above the upper through-hole 83 and the lower through-hole 84 and opens and closes to allow the outflow of the content 4 from the cylinder chamber R1 toward the nozzle portion 41.

[0033] The sub-piston 100 is made of synthetic resin and is disposed at a distance below the main piston 60 and includes an upper seal portion 101 that contacts the inner peripheral surface of the first cylinder portion 21 and a lower seal portion 102 that contacts the inner peripheral surface of the second cylinder portion 23. The sub-piston 100 defines a sub-cylinder chamber R2 between itself and the cylinder body 20 between the upper seal portion 101 and the lower seal portion 102. Further, the sub-piston 100 includes a communication hole 103 that communicates the cylinder chamber R1 and the sub-cylinder chamber R2.

[0034] More specifically, the sub-piston 100 has a cylindrical tubular portion 100a with a smaller diameter than the first cylinder portion 21 and a flange-like portion 100b that protrudes radially outward about the axis O from the outer peripheral surface of the tubular portion 100a. An upper seal portion 101 is integrally provided at the upper end of the tubular portion 100a, and a lower seal portion 102 is integrally provided at the outer peripheral end of the flange-like portion 100b. The flange-like portion 100b faces the stepped portion 22, and most of the sub-cylinder chamber R2 is partitioned and formed between the flange-like portion 100b and the stepped portion 22. Note that, in a state where the pressing head 40 is at the top dead center, a gap may not be provided between the stepped portion 22 of the first cylinder portion 21 and the flange-like portion 100b of the sub-piston 100, and the stepped portion 22 and the flange-like portion 100b may be in contact with each other.

[0035] The sub-piston 100 is movable in the vertical direction with respect to the cylinder body 20 within a range where the upper seal portion 101 contacts the inner peripheral surface of the first cylinder portion 21 and the lower seal portion 102 contacts the inner peripheral surface of the second cylinder portion 23. Also, the vertical interval between the upper seal portion 101 and the main piston 60 is smaller than the distance between the top dead center and the bottom dead center of the pressing head 40 and the stem 30, that is, the vertical stroke. Therefore, when the pressing head 40 is pressed down and the main piston 60 moves downward while contacting the inner peripheral surface of the first cylinder portion 21 together with the pressing head 40 and the stem 30, the main piston 60 contacts the upper seal portion 101. Thereafter, the sub-piston 100 is pushed by the main piston 60 and moves downward together with the pressing head 40, the stem 30, and the main piston 60.

[0036] The piston guide 110 is provided on the stem connecting cylinder body 80 below the upper through hole 83 and the lower through hole 84, and contacts the sub-piston 100 below the upper through hole 83 and the lower through hole 84 to partition and form the main cylinder chamber R3 between the sub-piston 100 and the inflow side check valve 70. The main cylinder chamber R3 is a part of the cylinder chamber R1. In the present embodiment, the piston guide 110 is provided integrally with the stem connecting cylinder body 80 and has an umbrella shape that extends obliquely downward radially outward about the axis O from the lower end of the peripheral wall 81 of the stem connecting cylinder body 80.

[0037] When the piston guide 110 is in contact with the lower end of the cylindrical portion 100a of the sub-piston 100 from the lower side when the pressing head 40 and the stem 30 are at the top dead center. When the pressing head 40 and the stem 30 move downward from the top dead center, the piston guide 110 moves downward together with the pressing head 40 and the stem 30 and separates from the sub-piston 100. When the piston guide 110 separates from the sub-piston 100, the main cylinder chamber R3 communicates with the inner flow path 31 of the stem 30 through the upper through hole 83 and the lower through hole 84, and also communicates with the sub-cylinder chamber R2 through the communication hole 103.

[0038] Next, a method of using the pump-type discharge tool 1 or the pump-type discharge container 2 having the above configuration will be described.

[0039] When discharging the content 4 from the nozzle portion 41 of the pump-type discharge container 2, a pressing operation is performed by pressing the pressing head 40 downward from the initial state (the state shown in FIG. 1) where the pressing head 40 is at the top dead center (upper end position).

[0040] As shown in FIG. 2, when the pressing head 40 is pressed downward and moves downward from the top dead center toward the bottom dead center, the stem 30, the main piston 60, and the piston guide 110 move downward together with the pressing head 40 while compressing the spring 50. When the main piston 60 and the piston guide 110 move downward, the piston guide 110 separates from the sub-piston 100, and the main cylinder chamber R3 communicates with the inner flow path 31 of the stem 30 through the upper through hole 83 and the lower through hole 84, and at the same time, the volume of the cylinder chamber R1 including the main cylinder chamber R3 is reduced by the main piston 60. As a result, the content 4 inside the main cylinder chamber R3 is pressurized, flows into the inner flow path 31 of the stem 30 from the upper through hole 83 and the lower through hole 84, opens the outflow-side check valve 90, and is discharged to the outside from the discharge port 41a of the nozzle portion 41. At this time, the inflow-side check valve 70 is in a closed state, and the sub-piston 100 remains in the initial position.

[0041] When the pressing head 40 is further pushed downward and moves downward from the state shown in FIG. 2, the main piston 60 abuts against the upper seal portion 101 of the sub-piston 100, and the sub-piston 100 moves downward together with the pressing head 40, the stem 30, the main piston 60, and the piston guide 110. As can be understood from FIGS. 2 and 3, when the sub-piston 100 moves downward, the volume of the sub-cylinder chamber R2 increases. As a result, the content 4 inside the main cylinder chamber R3 is pressurized by the main piston 60, flows through the upper through-hole 83 and the lower through-hole 84 between the piston guide 110 and the sub-piston 100 into the inner flow path 31 of the stem 30, opens the outflow-side check valve 90, and is discharged to the outside from the discharge port 41a of the nozzle portion 41, and at the same time, flows into the inside of the sub-cylinder chamber R2 through the communication hole 103. At this time, the inflow-side check valve 70 is also in a closed state.

[0042] As shown in FIG. 3, when the pressing head 40 reaches the bottom dead center, the downward movement of the main piston 60 and the sub-piston 100 stops, and the discharge of the content 4 by the pressing operation of the pressing head 40 ends. At this time, the sub-cylinder chamber R2 is in a state of storing the content 4.

[0043] When the pressing operation of the pressing head 40 is released from the state shown in FIG. 3, the pressing head 40 starts to move upward toward the top dead center together with the stem 30, the main piston 60, and the piston guide 110 due to the elastic force of the spring 50.

[0044] As shown in FIG. 4, when the pressing head 40 moves upward toward the top dead center together with the stem 30, the main piston 60, and the piston guide 110, the piston guide 110 abuts against the sub-piston 100, and the communication between the upper through-hole 83 and the lower through-hole 84 of the main cylinder chamber R3 is blocked. As a result, when the pressing head 40 moves further upward together with the stem 30, the main piston 60, and the piston guide 110 from the state shown in FIG. 4, the inside of the main cylinder chamber R3 becomes negative pressure, the inflow-side check valve 70 opens, and the content 4 inside the container body 3 is sucked into the inside of the main cylinder chamber R3 through the tube 25.

[0045] Also, when the pressing head 40 further moves upward together with the stem 30, the main piston 60, and the piston guide 110 from the state shown in FIG. 4, the sub-piston 100 is pushed by the piston guide 110 and moves upward together with the pressing head 40. When the pressing head 40 moves upward, the volume of the sub-cylinder chamber R2 decreases. As a result, the content 4 inside the sub-cylinder chamber R2 flows into the inner flow path 31 of the stem 30 from the upper through hole 83 and the lower through hole 84 through the communication hole 103, opens the outflow-side check valve 90, and is discharged to the outside from the discharge port 41a of the nozzle portion 41. That is, the content 4 stored in the sub-cylinder chamber R2 when the pressing head 40 is being pressed down is discharged from the nozzle portion 41 when the pressing head 40 moves upward toward the top dead center.

[0046] As shown in FIG. 5, when the pressing head 40 moves to the top dead center, the sub-piston 100 is pushed by the piston guide 110 and returns to the initial position shown in FIG. 1, and all of the content 4 inside the sub-cylinder chamber R2 flows out from the communication hole 103. Further, when the sub-piston 100 returns to the initial position together with the piston guide 110, the main cylinder chamber R3 is filled with the content 4. Then, the pressing head 40 moves to the top dead center, and the movement of the main piston 60 and the sub-piston 100 stops.

[0047] As described above, the pump-type discharge tool 1 and the pump-type discharge container 2 according to the present embodiment are configured such that the content 4 is discharged from the nozzle portion 41 not only when the push-down head 40 is pushed down and moves from the top dead center to the bottom dead center, but also when the push-down head 40 moves from the bottom dead center toward the top dead center by the elastic force of the spring 50. Accordingly, according to the pump-type discharge tool 1 and the pump-type discharge container 2 of the present embodiment, compared with a configuration in which the content 4 is discharged only while the push-down head 40 is pushed down and moves from the top dead center to the bottom dead center, the discharge amount of the content 4 discharged when the push-down head 40 is pushed down can be reduced. Therefore, the discharge resistance of the content 4 generated when the push-down head 40 is pushed down can be reduced, and the force required for the push-down operation of the push-down head 40 can be reduced.

[0048] Further, in the pump-type discharge tool 1 and the pump-type discharge container 2 according to the present embodiment, since the spring receiving portion 13 with which the spring 50 engages is integrally provided on the mounting cap 10, the configuration of the pump-type discharge tool 1 and the pump-type discharge container 2 can be simplified and the cost thereof can be reduced.

[0049] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist thereof.

[0050] For example, in the above-described embodiment, the spring receiving portion 13 is integrally provided on the mounting cap 10. However, the present invention is not limited thereto, and a configuration in which the spring receiving portion 13 formed separately from the mounting cap 10 is attached to the mounting cap 10 may be employed.

Description of Reference Numerals

[0051] 1 Pump-type discharge tool 2 Pump-type discharge container 3 Container body 3a Mouth portion 4 Content 10 Mounting cap 11 Cap body 11a Top wall 12 Guide cylinder 13 Spring receiver 20 Cylinder body 21 First cylinder part 22 Step part 23 Second cylinder part 24 Cover cylinder 24a Connecting cylinder part 25 Tube 26 Air replacement hole 27 Air replacement hole 30 Stem 31 Inner flow path 40 Pushing head 41 Nozzle part 41a Discharge port 42 Head body 43 Mounting cylinder part 44 Outer peripheral wall 50 Spring 60 Main piston 70 Inflow side check valve 71 Support body 72 Valve body 73 Connecting leg part 80 Stem connecting cylinder body 81 Peripheral wall 82 Bottom wall 83 Upper through hole 84 Lower through hole 90 Outflow side check valve 91 Valve seat 92 Ball 100 Sub-piston 100a Cylindrical part 100b Flange-like part 101 Upper seal part 102 Lower seal part 103 Communication hole 110 Piston guide O Axis R1 Cylinder chamber R2 Sub-cylinder chamber R3 Main cylinder chamber

Claims

1. A pump-type discharging tool that is used by being attached to the mouth of a container body, a mounting cap that is attached to the mouth, a first cylinder part, and a second cylinder part having a larger diameter than the first cylinder part that is connected via a step part below the first cylinder part, a cylinder body supported by the mounting cap, a stem that is cylindrical, has an upper end protruding upward from the mounting cap, and is movable up and down with respect to the cylinder body, a nozzle part connected to the inner flow path of the stem, and a pressing head attached to the upper end of the stem, a spring provided between the mounting cap and the pressing head, and biasing the pressing head upward with respect to the mounting cap, a main piston provided on the outer peripheral surface of the stem, contacting the inner peripheral surface of the first cylinder part, and partitioning a cylinder chamber inside the cylinder body, an inflow-side check valve provided at the lower end of the cylinder body, and opening and closing to allow the inflow of the content from the inside of the container body toward the cylinder chamber, a stem connecting cylinder body formed in a bottomed cylindrical shape and fixed to the lower end of the stem, having a through hole on the peripheral wall that closes the inner flow path at the bottom wall and connects the cylinder chamber and the inner flow path, an outflow-side check valve provided in the inner flow path above the through hole, and opening and closing to allow the outflow of the content from the cylinder chamber toward the nozzle part, an upper seal part disposed at a distance below the main piston and contacting the inner peripheral surface of the first cylinder part, and a lower seal part contacting the inner peripheral surface of the second cylinder part, a sub-piston that partitions a sub-cylinder chamber between it and the cylinder body and has a communication hole connecting the cylinder chamber and the sub-cylinder chamber, a piston guide provided on the stem connecting cylinder body below the through hole, contacting the sub-piston below the communication hole, and partitioning a main cylinder chamber between the sub-piston and the inflow-side check valve, a pump-type discharging tool characterized by having.

2. The pump-type discharging tool according to claim 1, wherein a spring receiving part with which the spring engages is integrally provided on the mounting cap.

3. The pump-type discharging tool according to claim 1 or 2, wherein the spring is made of synthetic resin.

4. A pump-type discharge container, comprising: a container body; and the pump-type discharge tool according to claim 1 attached to the mouth of the container body.

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