Pump type discharge tool and pump type discharge container

Abstract

To provide a novel pump type discharge tool and a novel pump type discharge container that are reduced in force required for press-down operation on a press head.SOLUTION: The present invention relates to a pump type discharge tool 1, and a pump type discharge container 2 that has a mount cap 10, a cylinder body 20, a piston guide 30, a press-down head 40, a spring 50, a synthetic resin-made piston 60 comprising a lower seal piece 61a and an upper seal piece 61b, an inflow-side check valve 70, and a press part 80 provided integrally with the mount cap 10, and configured to press the upper seal piece 61b against an inner peripheral surface of the cylinder body 20 when the piston 60 is at an initial position. When the piston 60 moves down from the initial position to leave the press part 80, the lower seal piece 61a is further pressed against the inner peripheral surface of the cylinder body 20, and the upper seal piece 61b rotates to leave the inner peripheral surface of the cylinder body 20.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a pump-type dispensing tool and a pump-type dispensing container. [Background technology]

[0002] A pump-type dispenser is known as a dispenser container for storing contents such as disinfectant alcohol or hand soap, and is configured so that the contents can be easily dispensed by pressing down an upwardly biased push-down head to operate the pump and dispense a predetermined amount of the contents to the outside. A pump-type dispenser has been proposed that uses a resin biasing member as a means for biasing the push-down head upward, thereby reducing the burden on the environment and making it easier for users to dispose of it (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-69928 Summary of the Invention [Problem to be solved by the invention]

[0004] In the dispenser described in Patent Document 1, the upper and lower seal portions of the piston are located above and below an air inlet hole provided in the cylinder at the top dead center position of the push-down head. When the push-down head is pressed down to push the piston down, the air inlet hole communicates with the outside, allowing air to be introduced into the container. However, because the piston abuts and seals against the cylinder at two points, the upper and lower seal portions, increasing the sliding resistance between the piston and the cylinder. This requires a larger biasing force from the biasing member to return the push-down head to the top dead center after use. Therefore, particularly when a resin spring is used as the biasing member, increasing the spring constant of the biasing member to increase the biasing force can easily cause the push-down head to fail to return to the top dead center over time, a phenomenon known as "sagging." This leaves room for improvement in this regard.

[0005] The present disclosure has been made in consideration of such problems, and its purpose is to provide a new pump-type dispenser and pump-type dispenser container that reduces the force required to press down the press-down head. [Means for solving the problem]

[0006] The pump-type discharge device of the present disclosure comprises: [1] A pump-type discharge device that is attached to the mouth of a container body and used, an attachment cap attached to the mouth portion; a cylinder body provided with an air inlet hole and supported by the mounting cap and disposed inside the container body; a piston guide disposed inside the cylinder body and movable in the up and down direction; a push-down head that includes a nozzle portion connected to an inner flow path of the piston guide, is attached to an upper portion of the piston guide, and can be pushed down together with the piston guide; a biasing member that biases the press-down head upward; a piston that is movable up and down in cooperation with the press-down head and includes a lower seal piece that abuts against the inner peripheral surface of the cylinder body, and an upper seal piece that is located above the lower seal piece and the air introduction hole at the initial height position of the press-down head and abuts against an inner cylindrical portion that is located radially inward from a side surface of the cylinder body; Equipped with When the piston moves downward as the push-down head is pushed down, the upper seal piece separates from the inner cylindrical portion, and the air inlet hole communicates with the outside.

[0007] The pump-type discharge device of the present disclosure also includes: [2] In the configuration described in [1] above, it is preferable that the upper seal piece further includes a pressing member located on the radially opposite side of the inner tube portion, and that the pressing member presses the upper seal piece toward the inner tube portion at the initial height position of the pressing head.

[0008] The pump-type discharge device of the present disclosure also includes: [3] In the configuration described in [1] or [2] above, it is preferable that the push-down head has a vertical rib that can move up and down within a vertical groove that extends up and down and is provided in the mounting cap, and the mounting cap has a top wall surface that is connected to the upper part of the vertical groove via an inclined surface that rises in the circumferential direction, and by rotating the push-down head in the circumferential direction, the lower surface of the vertical rib moves from the upper part of the vertical groove via the inclined surface and onto the top wall surface, thereby moving the push-down head to the initial height position and entering a locked state in which it cannot be pushed down.

[0009] The pump-type discharge device of the present disclosure also includes: [4] In the configuration described in any one of the above [1] to [3], the biasing member is preferably a resin spring.

[0010] Further, the pump-type discharge container of the present disclosure is [5] The present invention is characterized by comprising a container body and a pump-type discharge device according to any one of [1] to [4] above, attached to the opening of the container body. [Effects of the Invention]

[0011] According to the present disclosure, it is possible to provide a new pump-type dispensing tool and a pump-type dispensing container that reduce the force required to press down the press-down head. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a cross-sectional view (partially half cross-sectional) of a pump-type dispensing container (locked state) equipped with a pump-type dispensing device according to an embodiment of the present disclosure. [Figure 2] 2 is an enlarged cross-sectional view (detailed view of part A) of the pump-type discharge container shown in FIG. 1, where a piston is provided. [Figure 3] 1 is a cross-sectional view (part of which is a half cross-sectional view) of a pump-type dispensing container (in use) equipped with a pump-type dispensing device according to an embodiment of the present disclosure. [Figure 4] 4 is an enlarged cross-sectional view (detailed view of part B) of the pump type discharge container shown in FIG. 3, where a piston is provided. [Figure 5A] FIG. 2 is a front view of an attachment cap used in a pump-type dispensing device according to an embodiment of the present disclosure. [Figure 5B] FIG. 2 is a plan view of an attachment cap used in a pump-type dispensing device according to an embodiment of the present disclosure. [Figure 6] 5C is a cross-sectional view taken along line CC in FIG. 5B. [Figure 7] FIG. 5C is an enlarged plan view of the first longitudinal groove, the inclined surface, and the top wall surface in FIG. 5B. [Figure 8] FIG. 8 is a cross-sectional view taken along the line DD in FIG. [Figure 9] 8 is a cross-sectional view taken along line E-E in FIG. 7. DETAILED DESCRIPTION OF THE INVENTION

[0013] A pump type discharge device 1 and a pump type discharge container 2 according to an embodiment of the present disclosure will be described in detail below with reference to the drawings.

[0014] In this specification, claims, abstract, and drawings, when the pump-type discharge container 2 is in the upright position shown in FIG. 1, the side where the push-down head 40 is located is referred to as the upper side (upper side in FIG. 1), and the side where the container body 3 is provided is referred to as the lower side (lower side in FIG. 1). The front-rear direction is the left-right direction in FIG. 1, and the left side in FIG. 1, from which the nozzle portion 41 protrudes, is the front. The left-right direction is the direction perpendicular to the plane of FIG. 1. The radially outward direction refers to the direction away from the central axis O along a straight line that passes through the central axis O of the pump-type discharge container 2 along the up-down direction in FIG. 1 and is perpendicular to the central axis O, and the radially inward direction refers to the direction toward the central axis O along that straight line. The circumferential direction refers to the direction of rotation around the central axis O.

[0015] The accompanying drawings of the present disclosure are drawn to equal scale in the up-down, front-back, and left-right directions, and the aspect ratio of the pump-type discharge container 2 in the drawings represents the aspect ratio of the pump-type discharge container 2 of the present disclosure. However, the configuration, shape, dimensional ratio, etc. of the pump-type discharge container 2 in the accompanying drawings are merely one embodiment of the present disclosure. The present disclosure should be interpreted based on the wording of the claims, and is not limited to the configuration, shape, dimensional ratio, etc. shown in the drawings.

[0016] As shown in Fig. 1, a pump type dispensing device 1 according to this embodiment is a so-called pump type dispenser that is used by being attached to a mouth portion 3a of a container body 3. The pump type dispensing device 1 and the container body 3 constitute a pump type dispensing container 2.

[0017] The container body 3 is, for example, a bottle container made of synthetic resin with a cylindrical mouth portion 3a centered on a central axis O. The container body 3 can store therein a liquid or fluid substance such as rubbing alcohol or hand soap as the content 4. The pump-type dispensing device 1 can dispense the content 4 stored in the container body 3 in predetermined amounts and discharge it to the outside.

[0018] The pump-type discharge device 1 has an attachment cap 10, a cylinder body 20, a piston guide (stem) 30, a push-down head 40, a spring 50 (biasing member), a piston 60, and an inlet-side check valve .

[0019] In this embodiment, the mounting cap 10, cylinder body 20, piston guide 30, push-down head 40, spring 50, piston 60, and inlet-side check valve 70 are made of synthetic resin material. Note that some of the above components may be made of different materials. For example, the spring 50 may be made of a metal material for springs.

[0020] The attachment cap 10 has a cap body 11 in the shape of a cylinder with a top, centered on a central axis O, and is detachably attached to the opening 3a by screwing the cap body 11. Note that the cap body 11 is not limited to being screwed, and may be configured to be attached to the opening 3a by, for example, plugging.

[0021] 1, 3, 6, etc., the attachment cap 10 is integrally provided with a cylindrical guide tube 12 that is integrally connected to the top wall 11a of the cap body 11 and extends upward from the top wall 11a, an inner tube portion 12a that extends downward from the top wall 11a, and a cylindrical pressing member 80 that extends downward from the top wall 11a on the radially outer side of the inner tube portion 12a (see FIG. 2). An annular spring receiving portion 13 that follows the inner circumferential surface of the inner tube portion 12a is integrally provided at the lower end of the inner tube portion 12a.

[0022] The inner cylindrical portion 12a is a cylindrical portion that hangs down from the top wall 11a at roughly the same radial position as the guide cylinder 12 (more precisely, at a radial position slightly inward than the guide cylinder 12), and at the initial height position of the push-down head 40 shown in Fig. 1 (in this embodiment, the height position of the push-down head 40 when the pump-type discharge container 2 is in circulation and before use, and the height position of the push-down head 40 in a locked state where the push-down head 40 cannot be pushed down), the upper seal piece 61b of the piston 60 abuts against the outer surface of the inner cylindrical portion 12a. Also, at this initial height position of the push-down head 40, a pressing member 80 (see Fig. 2) that hangs down from the top wall 11a radially outward of the inner cylindrical portion 12a presses the upper seal piece 61b of the piston 60 radially inward. With this configuration, when the push-down head 40 is at its initial height position, the upper seal piece 61b of the piston 60 is pressed against the inner cylindrical portion 12a from the radially outer side with a predetermined pressing force, sealing the air inlet hole 23 airtightly from the outside.

[0023] As shown in Figures 5A and 5B, the guide tube 12 of the attachment cap 10 is provided with first vertical grooves 14a and second vertical grooves 14b, through which the first vertical ribs 44a and second vertical ribs 44b (see Figure 1) provided on the press-down head 40 side can move up and down. The first vertical grooves 14a and second vertical grooves 14b are provided over the entire height range of the guide tube 12, as shown in Figure 5A. The first vertical grooves 14a and second vertical grooves 14b have circumferential widths corresponding to the first vertical ribs 44a and second vertical ribs 44b, respectively, and as shown in Figure 5B, the first vertical groove 14a has a narrower circumferential width than the second vertical groove 14b. The first vertical grooves 14a and second vertical grooves 14b are provided on opposite sides (opposite positions) in the circumferential direction. With this configuration, the first vertical rib 44a and the second vertical rib 44b of the press-down head 40, which have a circumferential width slightly narrower than the first vertical groove 14a and the second vertical groove 14b, can move up and down while being guided circumferentially inside the first vertical groove 14a and the second vertical groove 14b, so that the press-down head 40 can be moved smoothly up and down relative to the attachment cap 10.

[0024] As shown in FIG. 5B , the guide tube 12 of the attachment cap 10 includes third and fourth longitudinal grooves 15a and 15b, which are shallower than the first and second longitudinal grooves 14a and 14b and are positioned 90 degrees counterclockwise in the circumferential direction relative to the first and second longitudinal grooves 14a and 14b in a plan view. In the example shown in FIG. 5B , the third longitudinal groove 15a has a wider circumferential width than the fourth longitudinal groove 15b. A fifth longitudinal groove 15c is also provided adjacent to the radially inner side of the first and second longitudinal grooves 14a and 14b. The fifth longitudinal groove 15c has a narrower circumferential width than the first and second longitudinal grooves 14a and 14b and a depth approximately equal to that of the third and fourth longitudinal grooves 15a and 15b. The third longitudinal groove 15a is configured so that a rib provided below the nozzle portion 41 fits into the third longitudinal groove 15a when the press-down head 40 is pressed down. The fourth vertical groove 15b and the fifth vertical groove 15c are configured so that ribs provided on the nozzle portion 41 fit into the fourth vertical groove 15b and the fifth vertical groove 15c when the press-down head 40 is pressed down. The first vertical groove 14a to the fifth vertical groove 15c are arranged so that the corresponding ribs can fit into them only when the press-down head 40 is in a predetermined rotational position relative to the attachment cap 10. In this embodiment, the ribs fit into the corresponding first vertical groove 14a to the fifth vertical groove 15c with a slight circumferential gap, since the circumferential width of the ribs is slightly narrower than the circumferential width of the corresponding vertical groove.

[0025] Furthermore, as shown in Figures 5A, 5B, 7, 8 and 9, the guide tube 12 of the mounting cap 10 is provided with a rib mounting surface 16a arranged adjacent to the first vertical groove 14a and the second vertical groove 14b in a clockwise circumferential direction in a plan view, an inclined surface 16b inclined upward in a clockwise circumferential direction from the rib mounting surface 16a, and a top wall surface 16c arranged adjacent to the inclined surface 16b in a clockwise circumferential direction.

[0026] When the user rotates the press-down head 40 clockwise in a plan view while the press-down head 40 is biased near the top dead center by the biasing force of the spring 50, the lower surfaces of the first vertical rib 44a and the second vertical rib 44b, which were positioned above the rib mounting surface 16a in Fig. 5A due to the biasing force of the spring 50, rise along the rib mounting surface 16a and the inclined surface 16b to reach the top wall surface 16c. This movement of the lower surfaces of the first vertical rib 44a and the second vertical rib 44b to the top wall surface 16c causes the press-down head 40 to be pulled upward beyond the height position to which it was raised by the biasing force of the spring 50, and moves to the initial height position of the press-down head 40 (see Fig. 1) (locked state).

[0027] On the other hand, when a user rotates the push-down head 40 counterclockwise in a plan view from the initial height position of the push-down head 40 shown in Fig. 1, the lower surfaces of the first vertical rib 44a and the second vertical rib 44b, which had been resting on the top wall surface 16c, descend along the inclined surface 16b and enter the first vertical groove 14a and the second vertical groove 14b via the rib mounting surface 16a. This releases the push-down head 40 from its locked state (unlocked state), and the first vertical rib 44a and the second vertical rib 44b enter a usable state in which they can move up and down within the first vertical groove 14a and the second vertical groove 14b, respectively. Therefore, the user can use the push-down head 40 by pressing down on the push-down head 40 against the biasing force to eject the contents from the nozzle portion 41.

[0028] In the present embodiment, the first vertical rib 44a and the second vertical rib 44b are provided on the press-down head 40 side, and the first vertical groove 14a and the second vertical groove 14b are provided on the guide tube 12 side of the attachment cap 10, but the present invention is not limited to this. Although not shown, for example, the first vertical groove and the second vertical groove may be provided on the press-down head 40 side, and the first vertical rib and the second vertical rib may be provided on the guide tube 12 side of the attachment cap 10. In this case, the press-down head 40 may be provided with a bottom wall surface that is continuous with the lower part of the vertical groove via an inclined surface that descends in the circumferential direction, and by rotating the press-down head 40 in the circumferential direction, the upper surfaces of the first vertical rib and the second vertical rib move from the lower part of the first vertical groove and the second vertical groove via the inclined surface to the bottom wall surface, thereby moving the press-down head 40 to the initial height position and entering a locked state in which it cannot be pressed down.

[0029] The cylinder body 20 has a cylindrical cylinder side portion 21 centered on the central axis O, and a flange portion 22 integrally connected to the upper end of the cylinder side portion 21. The cylinder body 20 is supported by the attachment cap 10 and disposed inside the container body 3 by the flange portion 22 being fitted and fixed to the inside of the cap body 11.

[0030] The cylinder side portion 21 is provided with an air inlet hole 23 for introducing outside air into the container body 3 as the content 4 stored in the container body 3 decreases.

[0031] An inlet 24 is provided at the lower end of the cylinder body 20. A connecting tubular portion 25 that surrounds the inlet 24 and protrudes downward is integrally provided at the lower end of the cylinder body 20. A tube 26 that communicates with the interior of the container body 3 and the inlet 24 is connected to the connecting tubular portion 25. Although not shown in detail, the tube 26 extends to the bottom of the container body 3.

[0032] The piston guide 30 is cylindrical with a bottom, having a cylindrical peripheral wall 31 centered on the central axis O and a bottom wall 32 closing the lower end of the peripheral wall 31, and its inside forms an inner flow path 33. The upper end of the piston guide 30 protrudes upward from the mounting cap 10, and the lower end side is disposed inside the cylinder body 20.

[0033] An inlet hole 34 penetrating the peripheral wall 31 is provided on the lower end side of the peripheral wall 31 that is disposed inside the cylinder body 20 .

[0034] A stopper portion 35 is integrally provided at the lower end of the peripheral wall 31. The stopper portion 35 is flange-shaped and extends radially outward from the outer peripheral surface of the peripheral wall 31, and a plurality of ribs 35a are provided on the outer peripheral surface at intervals in the circumferential direction.

[0035] The push-down head 40 has a nozzle portion 41 connected to the inner flow path 33 of the piston guide 30, and is attached to the upper end of the piston guide 30 by fitting and fixing the upper end of the peripheral wall 31 of the piston guide 30 inside an attachment tube portion 43 provided on the head body 42. The nozzle portion 41 protrudes forward from the head body 42, and its tip forms a discharge port 41a for the contents 4. The head body 42 is integrally provided with a cylindrical outer peripheral wall 44 having a diameter larger than that of the guide tube 12.

[0036] The press-down head 40 can be pressed downward together with the piston guide 30, with the outer peripheral wall 44 guided by the guide tube 12. That is, the press-down head 40 can be moved vertically along the central axis O relative to the cylinder body 20 together with the piston guide 30, between the initial height position (the position shown in FIG. 1) and the bottom dead center position. Therefore, by pressing down the press-down head 40, the piston guide 30 can be moved from the initial height position to the bottom dead center position.

[0037] A push-down cylinder portion 45 is integrally provided on the push-down head 40. The push-down cylinder portion 45 is cylindrical and has a center on the central axis O. The push-down cylinder portion 45 is integrally and coaxially connected to the lower end of the mounting cylinder portion 43 and is disposed outside the peripheral wall 31 of the piston guide 30 with a gap therebetween. The lower end of the push-down cylinder portion 45 is adjacent to the inside of the spring receiving portion 13 at the lower end of the inner cylinder portion 12a.

[0038] 1 , and a spiral spring portion 51 connecting adjacent annular portions 52. The spring 50 is disposed between the attachment cap 10 and the press-down head 40, and biases the press-down head 40 upward, i.e., toward the initial height position. More specifically, the spring 50 is disposed coaxially outside the mounting tubular portion 43 and the press-down tubular portion 45, with its upper end abutting the lower surface of the head body 42 of the press-down head 40 inside the outer circumferential wall 44 and its lower end engaging with the spring receiving portion 13 provided on the attachment cap 10. The press-down head 40 and the piston guide 30 are biased upward by the elastic force of the spring 50, regardless of whether they are at the initial height position, bottom dead center, or a position between the initial height position and bottom dead center.

[0039] The spring 50 may be engaged with a portion other than the above, as long as it is provided between the attachment cap 10 and the press-down head 40 .

[0040] As shown in FIG. 2, the piston 60 has an annular shape centered on a central axis O, and integrally includes a piston main body 61, an inner cylindrical portion 62, and a connecting portion 63.

[0041] The piston main body 61 includes a lower seal piece 61a that abuts against the inner circumferential surface of the cylinder side portion 21 of the cylinder body 20, and an upper seal piece 61b that is provided above the lower seal piece 61a. A cylindrical portion 61c is formed between the lower seal piece 61a and the upper seal piece 61b, and the lower seal piece 61a protrudes radially outward from the cylindrical portion 61c. The upper seal piece 61b protrudes radially inward from the cylindrical portion 61c.

[0042] The inner cylindrical portion 62 has a cylindrical shape centered on the central axis O, and is attached to the outside of the peripheral wall 31 of the piston guide 30. When the piston guide 30 is at the initial height position, the inner cylindrical portion 62 abuts against the stopper portion 35 over the entire circumference at its lower end 62a, and abuts against the inner peripheral surface of the push-down cylindrical portion 45 over the entire circumference at its upper end 62b. When the lower end 62a of the inner cylindrical portion 62 abuts against the stopper portion 35 over the entire circumference, the inlet hole 34 of the piston guide 30 is blocked from communication with the cylinder chamber R.

[0043] The connecting portion 63 is annular and centered on the central axis O, and is integrally connected to the piston main body 61 and the inner cylindrical portion 62 .

[0044] As shown in FIG. 1 , the piston 60 defines a cylinder chamber R inside the cylinder body 20 by abutting the lower seal piece 61 a against the inner circumferential surface of the cylinder side portion 21. The piston 60 is disposed below the push-down cylindrical portion 45 with a predetermined distance therebetween (a distance sufficiently smaller than the stroke between the initial height position of the push-down head 40 and the bottom dead center). The piston 60 is also configured to move up and down in coordination with the push-down head 40. That is, when the push-down head 40 is pressed down, the push-down cylindrical portion 45 moves downward together with the push-down head 40 and the piston guide 30, and after the lower end 62 a of the inner cylindrical portion 62 leaves the stopper portion 35 provided on the piston guide 30, the lower end of the push-down cylindrical portion 45 abuts against the piston 60. The piston 60 is pushed by the push-down cylindrical portion 45 and moves downward together with the push-down head 40. Furthermore, when the press-down head 40 moves upward, the stopper portion 35 provided on the piston guide 30, which moves upward together with the press-down head 40, abuts against the lower end 62a of the inner cylindrical portion 62, and then the inner cylindrical portion 62 of the piston 60 is pushed by the stopper portion 35 and moves upward together with the press-down head 40.

[0045] The inlet check valve 70 is provided at the lower end of the cylinder body 20 and opens and closes to allow the contents 4 to flow from the inside of the container body 3 toward the cylinder chamber R.

[0046] In this embodiment, the inlet-side check valve 70 is a three-point valve that integrally includes an annular support member 71 fitted and fixed to the lower end of the cylinder body 20, a valve element 72 disposed above the inlet 24 to close the inlet 24, and three elastically deformable connecting legs 73 (only one of which is shown in FIG. 1 ) that connect the support member 71 and the valve element 72. When the pressure inside the cylinder chamber R is the same as or higher than the pressure inside the container body 3, the valve element 72 comes into contact with the upper surface of the periphery of the inlet 24 to close the space between the inlet 24 and the cylinder chamber R. On the other hand, when the pressure inside the cylinder chamber R becomes lower than the pressure inside the container body 3, the connecting legs 73 elastically deform, causing the valve element 72 to move upward, and the inlet-side check valve 70 opens to connect the inlet 24 to the cylinder chamber R.

[0047] In addition, the inlet side check valve 70 may be a check valve having a configuration other than the above-mentioned 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 contents 4 to flow from the inside of the container body 3 toward the cylinder chamber R.

[0048] 2, the pressing member 80 is provided as a cylindrical member radially outside the inner cylindrical portion 12a below the guide tube 12. The pressing member 80 is configured to press the upper seal piece 61b from the radially outside when the press-down head 40 is at the initial height position, thereby pressing the upper seal piece 61b against the outer peripheral surface of the inner cylindrical portion 12a to ensure a reliable seal.

[0049] As shown in FIG. 2, the air inlet hole 23 provided in the cylinder side portion 21 is located at a height between the lower seal piece 61a and the upper seal piece 61b when the push-down head 40 is at the initial height position. As shown in FIG. 1, the air inlet hole 23 communicates with the outside through the gap between the inner tube portion 12a and the push-down tube portion 45 and the gap between the guide tube 12 and the outer wall 44. When the piston 60 is actuated, outside air can be introduced through these gaps according to the amount of contents 4 dispensed into the container body 3. On the other hand, when the push-down head 40 is at the initial height position, the air inlet hole 23 is sealed between the lower seal piece 61a and the upper seal piece 61b pressed against the inner tube portion 12a by the pressing member 80, blocking communication with the outside. Therefore, even if the container body 3 is in a tilted position during distribution, for example, the contents 4 can be prevented from leaking out of the air inlet hole 23 through these gaps.

[0050] Next, a method of using the pump type discharge device 1 or the pump type discharge container 2 having the above-described configuration will be described.

[0051] When discharging the contents 4 from the nozzle portion 41 of the pump-type dispensing container 2, the push-down head 40 is rotated counterclockwise in a plan view from the initial height position (the position shown in FIG. 1) so that the lower surfaces of the first vertical rib 44a and the second vertical rib 44b descend from the top wall surface 16c along the inclined surface 16b and enter the first vertical groove 14a and the second vertical groove 14b via the rib mounting surface 16a. This releases the push-down head 40 from its locked state, and the first vertical rib 44a and the second vertical rib 44b enter a usable state in which they can move up and down within the first vertical groove 14a and the second vertical groove 14b, respectively. This allows the user to press the push-down head 40 downward.

[0052] Furthermore, as the first vertical rib 44a and the second vertical rib 44b enter the first vertical groove 14a and the second vertical groove 14b, the lower surfaces of the first vertical rib 44a and the second vertical rib 44b descend from the state in which they were pulled up to the top wall surface 16c, and the piston guide 30 also descends, and the upper seal piece 61b of the piston 60, which had been pushed up by the stopper portion 35 of the piston guide 30 and abutting against the inner cylindrical portion 12a and the pressing member 80, moves away from the pressing member 80 (see Figures 3 and 4), and the seal between the upper seal piece 61b and the inner cylindrical portion 12a is released.

[0053] When a user presses down the press-down head 40 to move it downward from the initial height position toward the bottom dead center, the spring 50 is compressed, and the piston guide 30 and the press-down cylinder part 45 move downward together with the press-down head 40.

[0054] When the piston guide 30 moves downward, the lower end 62a of the inner cylindrical portion 62 separates from the stopper portion 35, and the inlet hole 34 of the piston guide 30 communicates with the cylinder chamber R. After the inlet hole 34 communicates with the cylinder chamber R, the lower end of the push-down cylindrical portion 45 abuts against the piston 60, and thereafter, the piston 60, together with the piston guide 30 and the push-down cylindrical portion 45, is pushed by the push-down cylindrical portion 45 and moves downward.

[0055] When the piston 60 moves downward, the volume of the cylinder chamber R is narrowed by the piston 60, and the contents 4 inside the cylinder chamber R are pressurized and discharged from the inlet hole 34 through the inner flow path 33 inside the piston guide 30 and out through the discharge port 41a of the nozzle portion 41. At this time, the inlet-side check valve 70 is in a closed state.

[0056] Here, when the piston 60 moves downward from its initial position, the upper seal piece 61b of the piston 60 moves away from the pressing member 80, and the upper seal piece 61b also moves away from or comes into slight contact with the inner cylindrical portion 12a, and the seal between the upper seal piece 61b and the inner cylindrical portion 12a is released.

[0057] As described above, in the pump-type dispensing device 1 and pump-type dispensing container 2 according to this embodiment, when the piston 60 is in the initial position, the lower seal piece 61a and the upper seal piece 61b abut against the inner circumferential surface of the cylinder side portion 21 and the inner cylindrical portion 12a, respectively, thereby reliably sealing the air inlet hole 23. When the push-down head 40 is pressed down and the piston 60 moves downward from the initial position, only the lower seal piece 61a slides on the inner circumferential surface of the cylinder side portion 21, while the upper seal piece 61b is spaced apart from or slightly in contact with the inner cylindrical portion 12a, thereby reducing the sliding resistance generated between the piston 60 and other components when the piston 60 moves downward from the initial position. Therefore, the force required to press down the push-down head 40 can be reduced while ensuring the desired sealing performance by the piston 60.

[0058] Furthermore, in the pump-type dispenser 1 and pump-type dispenser container 2 according to this embodiment, the attachment cap 10, cylinder body 20, piston guide 30, push-down head 40, biasing member (spring 50), and piston 60 are formed from synthetic resin, which increases the recyclability of the pump-type dispenser 1 or pump-type dispenser container 2 while reducing the force required to push down the push-down head 40.

[0059] After the push-down head 40 is pushed down to the bottom dead center and the discharge of the contents 4 is completed, the push-down operation of the push-down head 40 is released, and the push-down head 40 moves upward due to the spring force of the spring 50. When the push-down head 40 moves upward, the stopper portion 35 abuts against the lower end 62a of the inner cylindrical portion 62, blocking communication between the inlet hole 34 and the cylinder chamber R. When the push-down head 40 moves further upward in this state, the piston 60, which moves upward together with the push-down head 40, creates a negative pressure in the cylinder chamber R, opening the inlet-side check valve 70 and allowing the contents 4 inside the container body 3 to flow through the tube 26 and the inlet port 24 and into the cylinder chamber R. When the push-down head 40 is returned to its initial height position, the piston 60 also returns to its initial position shown in FIG. 1, the air inlet hole 23 is blocked by the piston 60, and the cylinder chamber R is filled with the contents 4.

[0060] As described above, this embodiment is a pump-type discharge device 1 that is used by being attached to the opening 3a of the container body 3, and includes the attachment cap 10 that is attached to the opening 3a, the cylinder body 20 that has the air introduction hole 23 and is supported by the attachment cap 10 and is placed inside the container body 3, the piston guide 30 that is placed inside the cylinder body 20 and is movable in the vertical direction, the push-down head 40 that has the nozzle part 41 that is connected to the inner flow path 33 of the piston guide 30 and is attached to the top of the piston guide 30 and can be pushed down together with the piston guide 30, and the push-down head 40 that is facing upward. a lower seal piece 61a that abuts against the inner peripheral surface of the cylinder body 20; and an upper seal piece 61b that is provided above the lower seal piece 61a and the air introduction hole 23 at the initial height position of the press-down head 40 and abuts against an inner cylindrical portion 12a that is provided radially inward from the side surface of the cylinder body 20, and a piston 60 that can move up and down in cooperation with the press-down head 40, and when the piston 60 moves downward as the press-down head 40 is pressed down, the upper seal piece 61b moves away from the inner cylindrical portion 12a and the air introduction hole 23 communicates with the outside. By adopting this configuration, when the push-down head 40 is pressed down and the piston 60 moves downward from its initial position, only the lower seal piece 61a slides on the inner circumferential surface of the cylinder side portion 21, while the upper seal piece 61b is spaced apart from or slightly in contact with the inner cylindrical portion 12a, thereby reducing the sliding resistance generated between the piston 60 and other components when the piston 60 moves downward from its initial position. Therefore, the force required to press down the push-down head 40 can be reduced while ensuring the desired sealing performance with the piston 60.

[0061] Furthermore, in this embodiment, a pressing member 80 is further provided for the upper seal piece 61b, which is located on the radially opposite side of the inner cylindrical portion 12a, and the pressing member 80 is configured to press the upper seal piece 61b toward the inner cylindrical portion 12a when the press-down head 40 is at the initial height position. By adopting such a configuration, the upper seal piece 61b can reliably seal between the air introduction hole 23 and the outside when the press-down head 40 is at the initial height position in the locked state, and the force required to press down the press-down head 40 can be reduced.

[0062] In this embodiment, the press-down head 40 has vertical ribs (first vertical rib 44a and second vertical rib 44b) that are movable up and down within vertical grooves (first vertical groove 14a and second vertical groove 14b) provided in the attachment cap 10, and the attachment cap 10 has a top wall surface 16c that is continuous with the upper part of the vertical groove via an inclined surface 16b that rises in the circumferential direction. By rotating the press-down head 40 in the circumferential direction, the lower surfaces of the vertical ribs move from the upper part of the vertical groove via the inclined surface 16b onto the top wall surface 16c, moving the press-down head 40 to its initial height position and entering a locked state where it cannot be pressed down. With this configuration, the lower surfaces of the vertical ribs rise up to the top wall surface 16c without relying on the biasing force of a biasing member, thereby reliably positioning the upper seal piece 61b at a predetermined height and reliably sealing by abutment between the upper seal piece 61b and the inner cylindrical portion 12a.

[0063] In this embodiment, the biasing member is a resin spring. By adopting such a configuration, the biasing member is made of resin like the other members, and therefore the force required to press down the press-down head 40 can be reduced while improving the recyclability of the pump-type dispensing device 1 or the pump-type dispensing container 2.

[0064] In this embodiment, the attachment cap 10, the cylinder body 20, the piston guide 30, the push-down head 40, the biasing member, and the piston 60 are configured to be made of synthetic resin. By adopting such a configuration, the recyclability of the pump-type dispensing device 1 or the pump-type dispensing container 2 can be further improved, and the force required to push down the push-down head 40 can be reduced.

[0065] This embodiment is configured as a pump-type dispensing container 2 having a container body 3 and any one of the above-described pump-type dispensing devices 1 attached to the opening 3a of the container body 3. By adopting such a configuration, when the push-down head 40 is pressed down and the piston 60 moves downward from its initial position, only the lower seal piece 61a slides on the inner circumferential surface of the cylinder side portion 21, while the upper seal piece 61b is spaced apart from or slightly in contact with the inner cylindrical portion 12a, thereby reducing the sliding resistance generated between the piston 60 and other components when it moves downward from its initial position. Therefore, the force required to press down the push-down head 40 can be reduced while ensuring the desired sealing performance with the piston 60.

[0066] Although the present disclosure has been described based on various drawings and examples, it should be noted that those skilled in the art can easily make various modifications and alterations based on the present disclosure. Therefore, it should be noted that these modifications and alterations are included in the scope of the present invention. For example, the functions included in each component can be rearranged so as not to cause logical inconsistencies, and multiple components can be combined into one or divided. It should be understood that these modifications and alterations are also included in the scope of the present invention.

[0067] For example, in this embodiment, the piston 60 is configured to integrally include the piston main body portion 61, the inner cylindrical portion 62, and the connecting portion 63, but is not limited to this.

[0068] In addition, in this embodiment, the inner tube portion 12a and the pressing member 80 are configured to be integrally formed with the attachment cap 10, but this is not limited to this. At least one of the inner tube portion 12a and the pressing member 80 may be separate from the attachment cap 10, or may be provided integrally with a member other than the attachment cap 10.

[0069] Furthermore, in this embodiment, the pressing member 80 is provided as a cylindrical portion below the guide tube 12, but is not limited to this form and may have any other shape as long as it can press the upper seal piece 61b radially inward against the inner cylindrical portion 12a when the pressing head 40 reaches the initial height position.

[0070] In addition, in this embodiment, when the device is shifted from the locked state (a state in which the presser head 40 cannot be pressed down), which is the state when the device is in circulation or unused, to the unlocked state, the pressing member 80 automatically releases the pressing of the upper seal piece 61b, but this is not limited to this.The device may also be configured so that the pressing of the upper seal piece 61b by the pressing member 80 is released only when the user presses down the presser head 40 from the unlocked state.

[0071] In addition, in this embodiment, the height position of the press-down head 40 when it is in a locked state where it cannot be pressed down is defined as the initial height position, but this is not limited to this. The height position of the press-down head 40 when it is pushed up to the top dead center by the biasing means may also be defined as the initial height position of the press-down head 40. [Explanation of symbols]

[0072] 1. Pump-type discharge device 2. Pump-type discharge container 3 Container body 3a Mouth 4 Contents 10 Mounting cap 11 Cap body 11a Top wall 12 Guide tube 12a Inner cylinder part 13 Spring receiving part 14a First longitudinal groove (longitudinal groove) 14b Second longitudinal groove (longitudinal groove) 15a Third vertical groove 15b 4th vertical groove 15c 5th vertical groove 16a Rib mounting surface 16b Slope 16c Top wall surface 20 Cylinder body 21 Cylinder side (side) 22 Flange 23 Air inlet 24 Inlet 25 Connecting tube 26 tubes 30 Piston guide 31 Peripheral wall 32 Bottom wall 33 Inner flow path 34 Inflow hole 35 Stopper part 35a Rib 40 Press-down head 41 Nozzle section 41a Discharge port 42 Head body 43 Mounting tube 44 Peripheral wall 44a First vertical rib (vertical rib) 44b Second vertical rib (vertical rib) 45 Push-down tube 50 Spring (biasing member) 51 Spiral spring part 52 Circular section 60 pistons 61 Piston body 61a Lower seal piece 61b Upper seal piece 61c Cylindrical part 62 Inner cylinder part 62a bottom end 62b top end 63 Connecting part 70 Inflow side check valve 71 Support 72 Valve body 73 Connecting legs 80 Retaining member O center axis R cylinder chamber

Claims

1. A pump-type discharge device that is attached to the mouth of a container body and used, an attachment cap attached to the mouth portion; a cylinder body provided with an air inlet hole and supported by the mounting cap and disposed inside the container body; a piston guide disposed inside the cylinder body and movable in the up and down direction; a push-down head that includes a nozzle portion connected to an inner flow path of the piston guide, is attached to an upper portion of the piston guide, and can be pushed down together with the piston guide; a biasing member that biases the press-down head upward; a piston that is movable up and down in cooperation with the press-down head and includes: a lower seal piece that abuts against the inner peripheral surface of the cylinder body; and an upper seal piece that is located above the lower seal piece and the air introduction hole at the initial height position of the press-down head and abuts against an inner cylindrical portion that is located radially inward of a side portion of the cylinder body; Equipped with When the piston moves downward as the push-down head is pushed down, the upper seal piece moves away from the inner cylindrical portion, and the air introduction hole communicates with the outside.

2. The upper seal piece further includes a pressing member located on the radially opposite side of the inner cylindrical portion, The pump-type discharge device according to claim 1 , wherein the pressing member presses the upper seal piece toward the inner cylindrical portion when the press-down head is at an initial height position.

3. the pressing head has a vertical rib that is movable in a vertical groove that extends in a vertical direction and is provided in the attachment cap, the mounting cap has a top wall surface that is continuous with an upper portion of the longitudinal groove via an inclined surface that rises in the circumferential direction, 3. The pump-type discharge device according to claim 1, wherein the lower surface of the vertical rib moves from the upper part of the vertical groove via the inclined surface onto the top wall surface by rotating the push-down head in a circumferential direction, thereby moving the push-down head to the initial height position and entering a locked state in which it cannot be pushed down.

4. 3. The pump-type discharge device according to claim 1, wherein the biasing member is a spring made of resin.

5. A pump-type dispensing container comprising a container body and the pump-type dispensing device according to claim 1 or 2 attached to the opening of the container body.

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